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WO2018164108A1 - Dispositif de guidage de lumière - Google Patents

Dispositif de guidage de lumière Download PDF

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Publication number
WO2018164108A1
WO2018164108A1 PCT/JP2018/008532 JP2018008532W WO2018164108A1 WO 2018164108 A1 WO2018164108 A1 WO 2018164108A1 JP 2018008532 W JP2018008532 W JP 2018008532W WO 2018164108 A1 WO2018164108 A1 WO 2018164108A1
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WO
WIPO (PCT)
Prior art keywords
light
light guide
groove
degrees
guide plate
Prior art date
Application number
PCT/JP2018/008532
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English (en)
Japanese (ja)
Inventor
誠二 木下
Original Assignee
株式会社クラレ
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Filing date
Publication date
Application filed by 株式会社クラレ filed Critical 株式会社クラレ
Publication of WO2018164108A1 publication Critical patent/WO2018164108A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S2/00—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings

Definitions

  • the present invention relates to a light guide device.
  • Patent Document 1 describes a light guide device used in an edge light type illumination device.
  • a light guide device includes a light guide plate and a reflection sheet.
  • One of the main surfaces of the light guide plate is an emission surface.
  • a lenticular lens parallel to the light guide direction is provided on the exit surface.
  • a V-shaped groove orthogonal to the light guide direction is provided on the other surface of the main surfaces of the light guide plate.
  • the side surface of the light guide plate is an incident end surface. Light incident on the light guide plate from the incident end face is reflected by the V-shaped groove and the reflection sheet. The light further exits from the exit surface through the lenticular lens.
  • An object of the present invention is a light guide device including a light guide plate, which diffuses light incident from the side of the light guide plate in the light guide device and emits light using the main surface of the light guide plate as an output surface. Is to provide a device.
  • the exit surface method when the light is incident on the incident end face of the light guide plate and the exit surface of the light guide plate faces the irradiated surface that is irradiated with light from the exit surface, the exit surface method is used. It is an object to obtain an illuminance distribution that is bright in a direction at a low angle, approximately 20 to 30 degrees with respect to the line direction, and smoothly changes to a direction at a high angle, approximately 60 to 70 degrees.
  • a light guide device comprising a light guide plate and a reflective sheet
  • the light guide plate has an incident end surface having a light receiving surface, a lower bottom surface having a deflection surface, and an upper bottom surface having an internal reflection surface
  • the reflective sheet faces the internal reflective surface
  • the deflection surface has a plurality of grooves parallel to each other and narrowing according to the depth, The grooves are sequentially arranged in the direction from the vicinity of the light receiving surface toward the far side of the light receiving surface (hereinafter referred to as the light guide direction), and meandering smoothly when the light guide plate is viewed in plan view
  • the upper bottom surface is a ridge provided on the internal reflection surface, and has a ridge that is parallel to each other and extends in a direction along the light guide direction, In a cross section parallel to the normal line of the light receiving surface and the normal line of the reference plane in which the light guide plate extends, the average slope of the side of the contour line of the groove with respect to the reference plane is 12 on the light receiving surface side.
  • the deflection surface functions as a light emitting surface that emits light to a side far from the light receiving surface.
  • Light guide device When light is incident on the incident end face of the light guide plate from a light source, A part of the incident light is diffused by being reflected by the groove, is further reflected by the internal reflection surface and is diffused by the ridge, and is further emitted from the deflection surface, Further, the other part of the incident light exits without being reflected by the internal reflection surface, and further re-enters the light guide plate from the internal reflection surface by being reflected by the reflection sheet. Emanating from the deflection surface, Thus, the deflection surface functions as the light emitting surface. [1] The light guide device.
  • the average slope of the side portion of the groove contour line is 13.5 degrees to 17.5 degrees.
  • the light guide device according to [1] or [2].
  • the outline of the groove is a symmetrical trapezoid or triangle, If the contour line of the groove is trapezoidal, the width of the deepest part of the contour line is 1 to 250 ⁇ m, The depth of the groove is 2 to 100 ⁇ m. [1] to [3].
  • the inclination angle formed by the tangent line of the contour line of the groove with respect to the reference plane monotonously decreases as the depth in the groove increases, and depends on the depth in the groove. Change smoothly [4] The light guide device.
  • the meandering phases of the grooves coincide with each other among the plurality of grooves, With respect to the meandering valley of the groove, beyond the center of the amplitude of the meandering of the groove, the meandering mountain of another adjacent groove enters.
  • the light guide device according to any one of [1] to [5].
  • the outline of the ridge in the cross section of the ridge consists of a smoothly curved arc, elliptical arc, or parabola, In the base of the ridge, the angle formed by the contour line of the ridge with respect to the reference plane is 60 degrees or less.
  • the light guide device according to any one of [1] to [6].
  • the deflection surface is located in the center of the lower bottom surface, The lower bottom surface has a smooth surface surrounding the deflection surface;
  • the light guide device according to any one of [1] to [7].
  • a planar light emitting module comprising the light guide device according to any one of [1] to [8] and a point light source group, wherein the light receiving surface faces the point light source group,
  • the point light source group includes a plurality of point light sources arranged in rows at predetermined intervals in a direction parallel to the deflection surface. Planar light emitting module.
  • Two point light source groups are provided, where the point light source groups are referred to as first and second point light source groups,
  • the light guide plate has two incident end surfaces, and each incident end surface has first and second light receiving surfaces facing each other across the deflection surface as the light receiving surfaces, respectively.
  • the first and second light-receiving surfaces are opposed to the first and second point light source groups, respectively.
  • the deflecting surface emits the light of the first point light source group toward the second light receiving surface side, and emits the light of the second point light source group to the first light receiving surface side.
  • the planar light emitting module according to [9].
  • a diffusion plate that opposes the lower bottom surface of the light guide plate and scatters light emitted from the deflection surface, or transmits light emitted from the deflection surface while facing the lower bottom surface of the light guide plate. Further having a transparent protective plate, The planar light emitting module according to [9] or [10].
  • the exit surface of the light guide plate provided in the light guide device faces the irradiated surface, it changes brightly in a low angle direction with respect to the normal direction of the exit surface and smoothly changes to a high angle direction. Illuminance distribution can be obtained.
  • FIG. 6 is a plan view of a light receiving surface viewed from the ⁇ Z direction. It is an end elevation showing the outline of a groove in a section. It is sectional drawing of a protruding item
  • Example 10 is a light distribution graph of the light guide device of Comparative Example 2. It is a light distribution graph of the comparative example 3 whose average inclination of a groove
  • FIG. 20 is a schematic diagram of a cross section of a light guide device in Example 18. 22 is a light distribution graph of Example 18. It is a front view of the planar light emitting module of Example 19.
  • light spreading means that light is diffused by an optical element whose three-dimensional dimensions are designed on a macroscopic scale. However, it is not intended that all optical paths that light can take within an optical element are fully predicted. Light diffusion is confirmed by experiments such as measurement of light distribution characteristics. Unless otherwise stated, the light spreading in this embodiment is distinguished from the accidental diffusion of light, which is the result of light irregular reflection or light scattering by fine particles or rough surfaces.
  • the optical element for spreading of light according to the present embodiment and the optical element for scattering or irregular reflection of light used in the present embodiment are combined to affect light, the result is as follows: And light spreading.
  • FIG. 1 shows a light guide device 40 according to this embodiment.
  • the light guide device 40 includes a light guide plate 45 and a reflection sheet 50.
  • the light guide plate 45 extends on the reference plane Ps. In the drawing, the reference plane Ps is parallel to the XY plane.
  • the light guide plate 45 includes a lower bottom surface having a deflection surface 41 and an upper bottom surface having an internal reflection surface 42. In the drawing, the deflection surface 41 and the internal reflection surface 42 extend along the XY plane.
  • the upper bottom surface is the other main surface of the light guide plate 45.
  • a part of the side surface is an end surface 43a having a light receiving surface.
  • the end surface 43a functions as an incident side surface.
  • the end face 43a in the drawing is parallel to the XZ plane.
  • FIG. 1 shows a cross section 44 of the light guide plate 45.
  • the cross section 44 is parallel to the normal line of the reference plane Ps and the normal line of the light receiving surface formed by the end face 43a. In the drawing, the cross section 44 is parallel to the YZ plane.
  • the incident direction In is preferably perpendicular to the light receiving surface formed by the end face 43a. In the figure, the incident direction In is parallel to the Y axis.
  • the light that has entered the light guide plate 45 from the light receiving surface formed by the end face 43a shown in FIG. 1 is guided along the light guide direction Gu.
  • the light guide direction Gu is parallel to the reference plane Ps.
  • the light guide direction Gu is parallel to the normal line of the light receiving surface formed by the end face 43a.
  • the light guide direction Gu is parallel to the cross section 44.
  • the light guide direction Gu is parallel to the Y axis.
  • the deflection surface 41 shown in FIG. 1 emits the guided light toward the emission direction Ex1.
  • the emission direction Ex1 is a direction toward the far side from the light receiving surface formed by the end face 43a. In this way, the deflection surface 41 functions as a light emitting surface.
  • An optical model for using the deflection surface 41 as a light emitting surface will be described later.
  • the end surface 43b faces the end surface 43a across the central portion of the light guide plate 45.
  • the end surface 43b may also be an incident end surface by having a light receiving surface. Such an embodiment will be described in Examples.
  • the reflective sheet 50 shown in FIG. 1 covers part or all of the internal reflective surface 42.
  • the reflection sheet 50 has a reflection surface 49.
  • the reflection surface 49 faces the internal reflection surface 42.
  • the reflective surface 49 may be in contact with the internal reflective surface 42 or may not be in contact therewith.
  • the diffuse reflectance of the reflecting surface 49 is preferably 90% or more.
  • the diffuse reflectance is a variable related to light diffused by irregular reflection.
  • the diffuse reflectance is defined as follows. Usually, the reflectance is measured by measuring the light reflected by the sample when the sample is irradiated with light. The reflected light includes specular reflection light and diffuse reflection light. A combination of these is called total light reflected light.
  • the total light reflectance is the reflectance of the total light reflected light.
  • Total light reflectance is the ratio of the amount of light reflected by the sample to the amount of light incident on the sample.
  • the diffuse reflectance is the ratio of the amount of diffusely reflected light to the amount of light incident on the sample.
  • the amount of diffusely reflected light is obtained by subtracting the amount of specularly reflected light from the amount of total reflected light. Since it is difficult to selectively measure the amount of diffuse reflection light, the diffuse reflectance is calculated in this way for convenience.
  • the deflection surface 41 shown in FIG. 1 has grooves 47a-d.
  • the deflecting surface 41 exhibits a function of deflecting light by the groove.
  • the depth in the grooves increases in the + Z-axis direction.
  • the grooves 47a-d are grooves that become narrow according to the depth in the grooves 47a-d.
  • FIG. 2 shows the deflection surface 41 as viewed from the -Z direction in FIG.
  • the grooves 47a-d are represented by a baseline representing the center of the groove.
  • the grooves 47a-d are parallel to each other.
  • the grooves 47a-d are sequentially arranged in the direction from the vicinity of the light receiving surface formed by the end face 43a to the far side of the light receiving surface. Such a direction coincides with the light guide direction Gu.
  • the grooves 47a-d extend in a direction crossing the light traveling along the light guide direction Gu. In the present embodiment, such a direction may be referred to as a longitudinal direction.
  • the shape of the meandering baseline of the grooves 47a-d shown in FIG. 2 may be a sine curve or a parabola. In the drawing, the line representing the edge of the groove is omitted. In the figure, grooves other than the grooves 47a-d are also shown. Grooves having the same shape as the grooves 47a-d may be further increased or decreased along the light guide direction Gu. The number of grooves can be designed as appropriate.
  • the grooves 47a-d meander smoothly.
  • the meandering phases may match between the grooves 47a-d and may be irregularly shifted from each other. In the figure, the phases of meandering are the same.
  • the distance between the base lines of adjacent grooves is preferably 0.02 to 2 mm, and more preferably 0.05 to 1.0 mm.
  • the term of the meandering amplitude center may represent the meandering vibration center.
  • the centers 46a-d are parallel to each other.
  • the center 46a-d is parallel to the end face 43a. In the figure, the center 46a-d is parallel to the X-axis direction.
  • the grooves 47a-d preferably do not cross each other.
  • the meandering mountain 48b of another adjacent groove 47b enters the meandering valley 48a of the base line of the groove 47a shown in FIG.
  • the meandering mountain 48b preferably further exceeds the center 46a which is the center of the meandering amplitude of the groove 47a.
  • the unit length Ul of the meandering of the baseline of the grooves 47a-d shown in FIG. 2 is the so-called meandering wavelength. In the grooves 47a-d, meandering for the unit length Ul is repeated.
  • the unit length Ul is preferably 3 mm or less, and more preferably 1 mm or less.
  • the maximum value of the baseline displacement from the center 46a-d is taken as the amplitude.
  • the amplitude is preferably 1 mm or less, and more preferably 600 ⁇ m or less.
  • the ratio represented by (amplitude) / (unit length Ul) may be referred to as ⁇ value.
  • ⁇ value When the unit length Ul is 0.5 mm and the amplitude is 70 ⁇ m (0.07 mm), the ⁇ value is 0.14.
  • the ⁇ value is preferably 0.12 or more. If it is smaller than this, it will be difficult to smoothly change the illumination surface illumination distribution.
  • FIG. 3 shows the outline of the groove 47a in the cross section 44 shown in FIG.
  • the upper base Bu represents the deepest portion of the groove 47a.
  • the width of the upper base Bu can be designed as appropriate.
  • the width of the upper base Bu may be zero. That is, the groove 47a may be a V-shaped groove in which the deepest portion of the groove 47a is angular.
  • the lower base Bl represents the opening of the groove 47a.
  • the width of the lower base Bl can be designed as appropriate.
  • the depth Dp represents the distance between the upper base Bu and the lower base Bl. That is, the depth Dp represents the entire depth of the groove 47a.
  • the depth Dp is preferably 2 to 100 ⁇ m, more preferably 4 to 15 ⁇ m.
  • the side parts La1 and La2 represent the slope of the groove 47a.
  • the outline may be a trapezoid made up of the upper base Bu, the lower base Bl, and the side portions La1 and La2 forming the legs.
  • the trapezoid may be a symmetrical trapezoid, that is, an isosceles trapezoid.
  • the width of the upper base Bu is preferably 1 to 250 ⁇ m, more preferably 1 to 5 ⁇ m.
  • the outline may be a triangle composed of the lower base Bl and the side portions La1 and La2.
  • the triangle may be a symmetrical triangle, that is, an isosceles triangle with the lower base B1 as the base.
  • the limitation that the contour line forms a trapezoid or a triangle does not mean that the contour line is limited to a shape in which the upper base Bu and the side portions La1 and La2 are strictly formed by straight lines. . That is, the side portions La1 and La2 may be configured with a curve including an example described later.
  • the upper base Bu may also be configured with a curve.
  • the trapezoid may be replaced with a figure in which the legs formed on the sides of the trapezoid are replaced with curves.
  • the triangle may be replaced with a figure in which the side formed by the side of the triangle is replaced with a curve.
  • the average slopes of the side portions La1 and La2 with respect to the reference plane Ps are represented as slopes Ob1 and Ob2.
  • the slope Ob1 is the slope on the slope in the light guide direction, that is, the slope closer to the light receiving surface among the slopes of the groove 47a.
  • the slope Ob2 is a slope on the slope in the light guide direction, that is, the slope far from the light receiving surface among the slopes of the groove 47a.
  • the angle formed by the cross section 44 and the groove 47a is not necessarily 90 degrees. Therefore, the contour line may proceed so as to cross the slope of the groove 47a obliquely. Therefore, the slopes Ob1 and Ob2 shown in FIG. 3 do not necessarily coincide with the so-called maximum slope of the slope of the groove 47a.
  • the inclination Ob2 is an angle formed by a reference plane Ps and a line segment connecting the intersection of the side portion La2 and the lower base B1, and the intersection of the side portion La2 and the upper base Bu. The same applies to the case where the side portions La1 and La2 are formed of curves.
  • the slope Ob1 shown in FIG. 3 is preferably 12.5 degrees to 20 degrees, more preferably 13.5 degrees to 17.5 degrees.
  • the inclination Ob2 is preferably 12.5 degrees to 20 degrees, more preferably 13.5 degrees to 17.5 degrees.
  • the slope Ob2 is preferably equal to the slope Ob1.
  • the vertex angle V is preferably 140 to 155 degrees, and more preferably 145 to 153 degrees.
  • the side portions La1 and La2 shown in FIG. 3 may be replaced with side portions La3 and 4 each formed of a curve.
  • the side parts La3 and La4 are curved so that the inclination becomes larger as they are closer to the lower base Bl.
  • the inclination angle formed by the tangent line of the side portion La3 and the tangent line of the side portion La4 with respect to the reference plane decreases monotonously as the depth in the groove increases, and is smooth according to the depth in the groove. To change.
  • the angle formed between the tangent line of the side portion La3 and the tangent line of the side portion La4 and the reference plane Ps shown in FIG. 3 changes smoothly in the range of 5 degrees to 25 degrees, preferably 10 degrees to 20 degrees.
  • the opening angle of the tangent line of the side portion La3 and the tangent line of the side portion La4 when viewed from the lower bottom Bl side shown in FIG. In such a curved groove, the apex angle V changes depending on the depth in the groove 47a.
  • a contour line having a curve as shown in the side portions La3 and La4 shown in FIG. 3 can be designed by a spline curve, for example.
  • the slopes of the side portions La3 and 4 are also equal to the slopes Ob1 and Ob2.
  • grooves than the groove 47a have the same contour line as the groove 47a in the cross section 44.
  • the cross-sectional shape of such a groove is preferably the same at any location when it travels along the center of the groove.
  • the cross-sectional shape of the groove is preferably the same in any X coordinate.
  • a plurality of ridges including ridges 51 are provided on the internal reflection surface 42 shown in FIG. These ridges are parallel to each other.
  • a plane parallel to the reference plane Ps may be provided between the parallel ridges. Such a plane may be a smooth surface.
  • the protrusion 51 may be formed integrally with the central portion of the light guide plate 45. What was attached as a separate body with respect to the center part of the light-guide plate 45 may be used.
  • the central axis of the ridge 51 is preferably a straight line.
  • These ridges including the ridge 51 shown in FIG. 1 extend in a direction along the light guide direction Gu.
  • the ridge 51 is preferably perpendicular to the light receiving surface formed by the end surfaces 43a and 43b.
  • the ridge 51 can be a straight line parallel to the normal line of the light receiving surface. In the figure, the ridges 51 are parallel to the Y axis.
  • the 1 can have a height of 10 to 500 ⁇ m, preferably 10 to 50 ⁇ m.
  • the height of the ridges 51 may not be constant.
  • the center-to-center distance between the ridges can be 50 to 300 ⁇ m.
  • the thickness of the light guide plate 45 including the height of the ridges 51 is preferably 1 to 4 mm, and more preferably 2 to 3 mm.
  • the outline of the ridge 51 in a cross section perpendicular to the central axis of the ridge 51 shown in FIG. 1 may be an elliptical arc, an arc, a parabola, or a polygon.
  • the arc may be a semicircle. It is preferable that the ridge is smoothly curved.
  • the ridge 51 is a lenticular lens formed of an arc
  • the aspect ratio of the ridge 51 will be described with reference to the cross-sectional view of FIG.
  • the radius of the arc 52 forming the lenticular lens in the vertical section of the lenticular lens formed by the ridges 51 is represented by Ra. Further, the distance from the apex of the arc 52 to the string, that is, a positive arrow (versed sine) is set as Vs. At this time, the aspect ratio is represented by the formula: (Vs / 2Ra) ⁇ 100 (%).
  • the aspect ratio of the ridges 51 shown in FIG. 4 can be greater than 0% and 30% or less.
  • the aspect ratio is preferably 20%.
  • the angle formed by the tangent line with respect to the reference plane Ps at an arbitrary point on the arc 52 can be 0 to 85 degrees, preferably 0 to 70 degrees.
  • the angle formed by the tangent to the contour line of the ridge in the section of the ridge represents the angle with respect to the reference plane.
  • the angle An shown in FIG. 4 is an angle formed by a tangent to the contour line of the ridge 51 at the base of the ridge 51 with respect to a plane parallel to the reference plane Ps.
  • the angle An is preferably 60 degrees or less. If the aspect ratio is 20%, the angle An is 53.1 degrees.
  • FIG. 5 is an end view showing a cross section of the light guide device 40.
  • the front-rear direction is opposite to that in FIG.
  • An optical model for using the deflection surface 41 as a light emitting surface will be described below with reference to FIG.
  • a light beam 57 a that is part of the incident light travels through the light guide plate 45.
  • the light beam 57 a is reflected by a groove 47 a provided on the deflection surface 41. Since the groove 47a meanders, the light beam 57a is diffused by the groove 47a. Further, the light beam 57 a is reflected again by the internal reflection surface 42. The light rays 57a are further diffused by the ridges provided on the internal reflection surface.
  • the light beam 57a returns to the deflecting surface 41 again.
  • the light beam 57a is emitted from the deflecting surface 41 toward the outside.
  • the groove 47c through which the light beam 57a passes is inclined, it is reduced that the light beam 57a is totally reflected by the deflecting surface 41 and returns to the center of the light guide plate 45 again.
  • the light beam 57a travels in a direction at a high angle, approximately 60 to 70 degrees, with respect to the normal direction of the exit surface. In the figure, it proceeds in the direction of 60 to 70 degrees with respect to the ⁇ Z direction.
  • the light beam 57 b which is another part of the incident light travels in the light guide plate 45.
  • the light beam 57 b is emitted from the internal reflection surface 42 without being reflected by the internal reflection surface 42.
  • the light beam 57 b is further reflected by the reflection surface 49 of the reflection sheet 50.
  • the reflection surface 49 may have a predetermined diffuse reflectance so that the light beam 57b is irregularly reflected.
  • the light beam 57 b is incident on the internal reflection surface 42.
  • the light beam 57 b reenters the light guide plate 45.
  • the light beam 57b is emitted from the deflecting surface 41 toward the outside.
  • the light beam 57a travels at a low angle with respect to the normal direction of the exit surface, generally in the direction of 20 to 30 degrees. In the figure, it proceeds in the direction of 20 to 30 degrees with respect to the -Z direction.
  • the light guide device 40 shown in FIG. 5 may further include a diffusion plate 55 for scattering light.
  • the diffusion plate 55 is opposed to the lower bottom surface having the deflection surface 41.
  • the diffuser plate 55 scatters light including light rays 57 a and b emitted from the deflection surface 41.
  • the front and back surfaces of the diffusing plate 55 shown in FIG. 5 can be mirror surfaces or textured surfaces, and are not particularly limited.
  • the total light transmittance (T.T) of the diffusion plate 55 is preferably 90% or more.
  • the haze value (Haze) is preferably 70% or more.
  • the diffusion plate 55 may function as a protection plate.
  • the thickness of the diffusion plate 55 or the protection plate is preferably 0.1 to 3 mm.
  • the light guide device 40 has a desired light distribution characteristic based on at least the shape design of the optical element shown in FIGS. Demonstrate. In the first part of the following examples, the relationship between these optical elements and the light distribution characteristics will be described.
  • a smooth illuminance distribution change can be realized by the light distribution characteristics.
  • the relationship between the optical element and the change in illuminance distribution will be described.
  • FIG. 5 described above is a model and does not represent all light paths. Therefore, considering the presence of light partially reflected by the deflecting surface 41 and other light, the light distribution characteristics and the illuminance distribution change described above are realized by the light following various paths not shown in FIG. It is easily expected to be.
  • a predetermined light guide plate was first prepared.
  • a light guide device was obtained by covering the internal reflection surface or the deflection surface of the light guide plate with a reflection sheet as necessary.
  • the planar light emitting module was obtained by combining the light guide device and the point light source group. Optical measurement was performed on the planar light emitting module.
  • FIG. 6 shows the planar light emitting module 70 of the first embodiment.
  • the optical elements included in the planar light emitting module 70 will be described below.
  • the planar light emitting module 70 includes a light guide device 60 including a light guide plate 65 and a reflection sheet 50.
  • a lower bottom surface 61 of the light guide plate 65 is shown.
  • the reflection sheet 50 is installed on the back side of the lower bottom surface 61.
  • the reflection surface of the reflection sheet 50 has a diffuse reflectance of 90% or more.
  • the reflection sheet 50 is a diffusion type reflection sheet.
  • the lower bottom surface 61 has a deflection surface 41.
  • the light guide plate 65 shown in FIG. 6 has the same configuration as the light guide plate 45 shown in FIG.
  • the light guide plate 65 further has the following characteristics.
  • the deflection surface 41 is located at the center of the lower bottom surface 61.
  • the lower bottom surface 61 has a smooth surface 63 surrounding the deflection surface 41.
  • a smooth surface 63 is located between the end surface 43 a and the deflection surface 41.
  • the light guide plate 65 further has an upper bottom surface behind the lower bottom surface 61.
  • the upper bottom surface is not shown in the drawing.
  • the upper bottom surface may have an internal reflection surface surrounded by a smooth surface. In the examples and comparative examples, there is no smooth surface between the end surface 43a and the internal reflection surface and between the end surface 43b and the internal reflection surface. That is, it has an internal reflection surface from the end surface 43a to the end surface 43b.
  • the planar light emitting module 70 shown in FIG. 6 further includes a point light source group 66.
  • An end face 43 a forming a light receiving surface faces the point light source group 66.
  • the point light source group 66 has a plurality of point light sources arranged in rows at predetermined intervals. The number of point light sources is not limited.
  • the point light source is preferably an LED. In this embodiment, a white LED is used as a point light source.
  • the direction of the row formed by the point light sources is parallel to the deflection surface 41.
  • channel provided in the deflection surface with which the light-guide plate of Example 1 is provided is demonstrated referring FIG.
  • the unit length Ul of the meandering of the groove base line is 0.5 mm.
  • the amplitude of the meandering of the groove baseline is 70 ⁇ m (0.07 mm).
  • the ⁇ value is 0.14.
  • the spacing between the groove baselines is 62 ⁇ m.
  • 662 grooves are provided without gaps. The phases of the grooves are the same.
  • the width of the upper base Bu is 0 ⁇ m. That is, the outline of the cross section of the groove is a triangle.
  • the width of the lower base Bl is 55 ⁇ m.
  • the depth Dp is 7 ⁇ m. Both the slope Ob1 and the slope Ob2 are equal. That is, the outline of the cross section of the groove is an isosceles triangle. These angles are 15 degrees.
  • the apex angle V is 150 degrees.
  • the side portions of the groove are linear as shown by the side portions La1 and La2.
  • the contour of the cross section of the ridge is an arc.
  • the ridge is a lenticular lens.
  • a ridge having a circular cross-sectional outline may be particularly referred to as a lenticular.
  • the aspect ratio is 20%.
  • the height of the ridge is 12.5 ⁇ m.
  • the planar light emitting module 70 further includes a reflector 67.
  • the reflective material 67 is a member having a different direction from the reflective sheet 50.
  • the reflective surface of the reflective material 67 faces the end surface 43b. The light is irregularly reflected on the reflecting surface of the reflector 67.
  • the point light source group 66 shown in FIG. 6 was turned on, and the light distribution characteristics of the planar light emitting module of Example 1 were measured. The results are shown in FIGS. The mode of measuring the light distribution characteristics is the same in the other examples and comparative examples.
  • FIG. 7 shows a gonio map of the planar light emitting module of Example 1.
  • a gonio map is sometimes called an isoluminous graph.
  • the X axis and the Y axis correspond to the X axis and the Y axis shown in FIG.
  • the upper part of the gonio map corresponds to the emission direction Ex1 shown in FIG.
  • the 0 degree at the center represents the luminous intensity in the ⁇ Z direction shown in FIG.
  • G 7 represent regions where the level of luminous intensity (cd) per 1,000 ⁇ m of luminous flux is equal.
  • the range of luminous intensity in each region is as follows. G1 (0.0-67.5), G2 (67.5-135.0), G3 (135.0-202.5), G4 (202.5-270.0), G5 (270.0-337.5), G6 (337.5-405.0), G7 (405.0-472.5), G8 (472.5-540.0).
  • FIG. 8 shows a light distribution graph of the planar light emitting module of Example 1.
  • the 0 degree at the center represents the luminous intensity in the ⁇ Z direction shown in FIG.
  • ⁇ 90 degrees represents the ⁇ X direction shown in FIG. 1
  • +90 degrees represents the + X direction shown in FIG.
  • the light distribution curve Dy ⁇ 90 degrees represents the ⁇ Y direction shown in FIG. 1
  • 90 degrees represents the + Y direction shown in FIG.
  • the way to read the graph is the same below.
  • Example 7 and 8 show that the light emitted from the planar light emitting module of Example 1 is biased in the + Y direction. It can also be seen that the light intensity around 60-70 degrees in the + Y direction is the strongest. It can also be seen that the luminous intensity changes gradually from around 0 degrees to around 60-70 degrees. It can also be seen that light diffuses gently in the +/ ⁇ X direction.
  • Comparative Example 1 shown in FIG. 9 a light guide plate equivalent to the light guide plate 65 used in Example 1 was used. However, the reflection sheet 50 facing the internal reflection surface 42 was not used. In the light guide plate 65 in the drawing, the drawing of the smooth surface around the deflection surface 41 and the internal reflection surface 42 is omitted for convenience of explanation.
  • the reflective material 67 was used.
  • the light beams 58a to 58c shown in FIG. 9 schematically represent a light beam derived from a point light source.
  • the light represented by the light beams 58a to 58c is guided along the light guide direction Gu.
  • the direction of the light is changed by the action of the deflection surface 41.
  • a part of the light is reflected by the internal reflection surface 42 and then emitted from the deflection surface 41 along the emission direction Ex2.
  • Ex2 represents all directions in the emission direction on the deflection surface 41 side.
  • the emission direction Bc1 represents all directions among the emission directions on the internal reflection surface 42 side.
  • the luminous flux on the emission direction Ex2 side and the luminous flux on the emission direction Bc1 side are compared, the luminous flux on the emission direction Bc1 side is larger.
  • Example 1 by providing the reflection sheet 50 as shown in FIG. 9, the light emitted from the internal reflection surface 42 is reflected by the reflection surface of the reflection sheet 50. Thereby, a lot of light can be emitted from the deflection surface 41 side.
  • FIG. 9 is a reflective sheet equivalent to the reflective sheet 50.
  • Comparative Example 2 a light guide device in which the reflection sheet is arranged on the deflection surface side in this way was used. Thereby, the light emitted from the deflection surface side is reflected by the reflection sheet, reenters the light guide plate from the deflection surface, and exits from the internal reflection surface 42 side.
  • FIG. 10 shows the light guide device 75 of the second comparative example.
  • the light guide device 75 of the comparative example 2 has a deflection surface 71 instead of the deflection surface 41 (FIG. 1).
  • the deflection surface 71 includes linear grooves 77a-d.
  • the light guide device 75 does not include a reflection sheet provided on the internal reflection surface 42 side.
  • the light guide device 75 includes a reflection sheet 68 provided on the deflection surface side.
  • Other features are the same as those of the light guide device of the first embodiment.
  • the light guided in the light guide plate 45 is emitted along the emission direction Bc2.
  • the emission direction Bc2 is a direction toward the side far from the light receiving surface formed by the end face 43a.
  • Comparative Example 2 a planar light emitting module was produced in the same manner as in Example 1 using the light guide device 75 shown in FIG. The light distribution characteristics of the planar light emitting module of Comparative Example 2 were measured.
  • FIG. 11 shows a light distribution graph of the planar light emitting module of Comparative Example 2. It can be seen that the light emitted from the planar light emitting module of Comparative Example 2 is also biased in the + Y direction. However, the light intensity in the vicinity of 40-60 degrees inclined from the + Z direction on the + Y direction side was the strongest. It can also be seen that the luminous intensity is weak at around 0 to 20 degrees, but the luminous intensity increases rapidly from around 30 degrees. The light diffused gently in the +/ ⁇ X direction.
  • planar light emitting module depend on the average slope or apex angle V of the groove. As described below, planar light emitting modules having different average slopes of the grooves were prepared, and their light emission characteristics were measured.
  • FIG. 12 shows a light distribution graph of the planar light emitting module of Comparative Example 3.
  • the average inclination of the grooves is 25 degrees.
  • the apex angle V is 130 degrees.
  • the spacing between the groove baselines is 40 ⁇ m.
  • the light intensity decreased in the vicinity of 60 ° tilted to the + Y direction side from the + Z direction. For this reason, unlike Example 1, two remarkable light intensity peaks were formed.
  • FIG. 13 shows a light distribution graph of the planar light emitting module of Comparative Example 4.
  • the average slope of the grooves is 22.5 degrees.
  • the apex angle V is 135 degrees.
  • the spacing between the groove baselines is 45 ⁇ m.
  • the light intensity decreased in the vicinity of 60 ° tilted to the + Y direction side from the + Z direction. For this reason, unlike Example 1, two remarkable light intensity peaks were formed.
  • FIG. 14 shows a light distribution graph of the planar light emitting module of Example 2.
  • the average slope of the grooves is 20 degrees.
  • the apex angle V is 140 degrees.
  • the spacing between the groove baselines is 50 ⁇ m. It can be seen that the light intensity slightly decreased in the vicinity of 60 ° tilted to the + Y direction side from the + Z direction, but gradually changes to 60-70 °.
  • FIG. 15 shows a light distribution graph of the planar light emitting module of Example 3.
  • the average slope of the grooves is 17.5 degrees.
  • the apex angle V is 145 degrees.
  • the spacing between the groove baselines is 55 ⁇ m.
  • the light intensity slightly decreased in the vicinity of 65 ° tilted to the + Y direction side from the + Z direction. However, it can be seen that the luminous intensity changes gradually to around 60-70 degrees.
  • FIG. 16 shows a light distribution graph of the planar light emitting module of Example 1.
  • the average inclination of the grooves is 15 degrees.
  • the apex angle V is 150 degrees.
  • the spacing between the groove baselines is 62 ⁇ m.
  • FIG. 17 shows a light distribution graph of the planar light emitting module of Example 4.
  • the average slope of the grooves is 12.5 degrees.
  • the apex angle V is 155 degrees.
  • the spacing between the groove base lines is 73 ⁇ m. Similar to Example 1, the light intensity in the vicinity of 60-70 degrees inclined to the + Y direction side from the + Z direction was strong, and no decrease in light intensity was observed in this vicinity. The intensity in the ⁇ Y direction was slightly higher than in Example 1.
  • FIG. 18 shows a light distribution graph of the planar light emitting module of Comparative Example 5.
  • the average inclination of the grooves is 10 degrees.
  • the apex angle V is 160 degrees.
  • the spacing between the groove baselines is 90 ⁇ m.
  • the light intensity on the -Y direction side was higher than in the other examples. In addition, a decrease in luminous intensity was observed up to around 30 degrees.
  • the average inclination is preferably 12.5 degrees to 20 degrees. It was also found that the apex angle V is preferably 140 to 155 degrees. When the average inclination or the apex angle V is in such a range, a certain amount of light is emitted in a direction at a low angle with respect to the normal direction of the emission surface, and evenly at various angles until reaching a high angle direction. It was found that light was emitted.
  • FIG. 19 shows the relationship between the apex angle V of the groove and the emitted light beam. It was found that the larger the average slope or the smaller the apex angle V, the larger the amount of light emitted. It was also found that the amount of emitted light beam can be kept at a sufficient level when the average inclination is 12.5 degrees or more or the apex angle V is 155 degrees or less. Even in Example 4 where the emitted light flux was the lowest, 90% or more of the emitted light flux of Comparative Example 3 was obtained.
  • the relationship between the optical element applied to the light guide device and the change in illuminance distribution was examined.
  • the light guide device 60 of Example 1 was installed so as to face the irradiated surface 80.
  • the deflection surface 41 faces the irradiated surface 80. Drawing of the smooth surface around the deflection surface 41 is omitted (see FIG. 6).
  • the light traveling along the emission direction Ex1 travels toward the irradiated surface 80 while diffusing. Such light illuminates the illuminated surface 80.
  • a point light source group not shown in FIG. 20 was turned on and light was transmitted through the light guide device 60 from the incident direction In.
  • the illuminance on the irradiated surface 80 was measured.
  • the distance between the deflection surface 41 and the irradiated surface 80 was 60 cm.
  • FIGS. 21 and 22 were obtained from the measured values of illuminance in the + Y direction and the ⁇ X direction from the reference point Re.
  • the dimensions of the light guide plate and the polarizing plate are as shown in dimensions af of FIG.
  • the vertical axis of the graph represents the illuminance ratio. That is, the illuminance at each distance where the maximum illuminance is obtained for each planar light emitting module is 1, and the illuminance value at each distance is expressed as a ratio. The same shall apply hereinafter.
  • 21 and 22 will be used to explain the effect of the ridges and grooves meandering.
  • 21 and 22 are graphs showing the illuminance distribution of Example 1 (Wo1) and Comparative Examples 6 (Co6) and 7 (Co7).
  • Wo Example 1
  • Co6 Comparative Examples 6
  • Co7 Comparative Examples 6
  • Co7 Comparative Examples 7
  • FIG. 21 shows the + Y direction
  • FIG. 22 shows the ⁇ X direction.
  • Comparative Examples 6 and 7 and Example 1 are different in the following points.
  • the light guide plate of Comparative Example 6 is provided with straight grooves (Straight) instead of meandering grooves (Meander).
  • no protrusions are provided on the internal reflection surface. Therefore, the internal reflection surface is a specular surface.
  • the apex angle V is 150 degrees (V150).
  • an illuminance maximum point Ma1 was found in the vicinity of a distance of 400 to 500 mm from the reference point.
  • a local maximum point Ma2 of illuminance was observed near a distance of 1,000 mm from the reference point. These maximum points were visible as bright lines on the irradiated surface.
  • the illuminated surface in a low angle direction with respect to the normal direction of the deflecting surface 41 that is, the illuminated surface in the vicinity is brightly illuminated, and the high angle direction It was possible to smoothly change the illuminance distribution up to the irradiated surface in FIG. These effects are thought to depend on the presence of ridges and meandering grooves.
  • 23 and 24 show graphs representing the illuminance distributions of Examples 4, 1, and 2 and Comparative Examples 3, 8, and 2.
  • FIG. 23 shows the + Y direction.
  • FIG. 24 shows the ⁇ X direction.
  • Comparative Example 8 a reflective sheet is provided on the deflection surface side as in Comparative Example 2 (Reversed, FIG. 10).
  • Comparative Example 2 a groove having an apex angle V of 150 degrees is provided on the deflection surface.
  • Comparative Example 8 a groove having an apex angle V of 130 is provided on the deflection surface. Further, each of the grooves is straight (Straight) unlike the first embodiment.
  • 25 and 26 are graphs showing the illuminance distributions of Example 5-7 and Comparative Example 9.
  • FIG. 25 is the + Y direction.
  • FIG. 26 is the ⁇ X direction.
  • Example 1 in each Example and Comparative Example.
  • the contour line of the groove in the cross section is a trapezoid.
  • the width of the upper base Bu shown in FIG. 3 is 2.5 ⁇ m.
  • the average slope and apex angle V of the side portions are Example 5 (12.5 degrees, V155), Example 6 (15 degrees, V150), Example 7 (17.5 degrees, V145), and Comparative Example, respectively. 9 (25 degrees, V130).
  • FIG. 27 and 28 show graphs showing the illuminance distributions of Examples 8, 9, and 1 and Comparative Example 10.
  • FIG. 27 shows the + Y direction.
  • FIG. 28 is the ⁇ X direction.
  • Example 1 the side portion of the groove in the cross section is curved.
  • the side part of the groove in the cross section is linear.
  • the apex angle V is constant at 150 degrees.
  • the side slope is constant at 15 degrees.
  • the apex angle V in the cross section is 150 degrees at the deepest part of the groove.
  • the apex angle V is 140 degrees at the shallowest part of the groove, that is, at the edge of the groove.
  • the slope of the tangent on the side of the groove changes smoothly from 20 degrees to 15 degrees as the depth in the groove increases.
  • the apex angle V in the cross section is 155 degrees at the deepest part of the groove.
  • the apex angle V is 140 degrees at the shallowest part of the groove, that is, at the edge of the groove.
  • the slope of the tangent to the side of the groove changes smoothly from 20 degrees to 12.5 degrees as the depth in the groove increases.
  • the groove of Comparative Example 10 is a groove having a trapezoidal basic shape. Furthermore, in Comparative Example 10, the apex angle V in the cross section is 120 degrees at the deepest portion of the groove. The apex angle V is 60 degrees at the shallowest part of the groove, that is, at the edge of the groove. The slope of the tangent on the side of the groove changes smoothly from 60 degrees to 30 degrees as the depth in the groove increases.
  • FIGS. 29 and 30 are graphs showing the illuminance distributions of Examples 1 and 10-13 and Comparative Examples 7 and 11.
  • FIG. 29 shows the + Y direction.
  • FIG. 30 shows the ⁇ X direction.
  • the ridge of Example 1 is a lenticular with an aspect ratio of 20%.
  • the angle formed by the normal of the contour line of the ridge in the section of the ridge with respect to the reference plane is 53.1 degrees at the base of the ridge, depending on the height in the ridge, and the vertex of the ridge. Vary to 0 degrees.
  • Each embodiment differs from the first embodiment in the following points.
  • Example 10 the shape of the outline of the cross-section of the ridges was radiation (Parabora).
  • the parabola is expressed by the following mathematical formula.
  • V V top ⁇ kU 2 (formula ⁇ parabola)
  • the contour line when the ridge 51 constituting the internal reflection surface 42 is cut along the XZ plane is defined as the cross-sectional shape of the ridge 51.
  • a ridge 51 is shown as one representative ridge.
  • an intersection line between the XZ plane and the bottom surface of the protrusion 51 is defined as an intersection line 53.
  • the center of the intersection line 53 is newly set as the origin of the UV coordinate system.
  • the axis parallel to the X axis is taken as the U axis.
  • An axis parallel to the Z axis is taken as a V axis.
  • V V top ⁇ kU 2 (formula ⁇ parabola).
  • the ridge was a lenticular lens having an elliptical cross section. That is, the shape of the outline of the cross section of the ridge was an elliptical arc.
  • the ellipse that is the origin of the elliptical arc will be described with the help of the UV coordinate system shown in FIG.
  • the ellipse is represented by the following formula.
  • Example 13 as in Example 1, the contour line of the cross section of the ridge was lenticular. However, the aspect ratio was set to 35%.
  • the angle formed by the normal of the contour line of the ridge in the section of the ridge with respect to the reference plane is 72.5 degrees at the base of the ridge, depending on the height in the ridge, and the vertex of the ridge. Vary to 0 degrees.
  • the shape of the contour line of the cross section of the ridge was a trapezoid having a wide base on the ridge base side.
  • the angle between the leg and the lower base was 55 degrees.
  • the contour line of the ridge in the section of the ridge is preferably a smoothly curved arc, elliptical arc, or parabola.
  • the cross-sectional shape of the ridges is trapezoidal as in Comparative Example 11, a minimum illuminance point is seen in the vicinity of a distance of 1000 mm from the reference point, which is not a preferable illuminance distribution.
  • the angle formed by the tangent of the contour line of the ridge at the base of the ridge with respect to the reference plane is 60 degrees or more.
  • the illuminance is maximum when the distance from the reference point is 500 mm. For this reason, the illuminance near the reference point decreased, and the degree of decrease was milder than those of Comparative Examples 2 and 8.
  • the angle formed by the tangent line of the contour line of the ridge at the base of the ridge with respect to the reference plane is 60 degrees or less.
  • the vicinity of the reference point has the maximum illuminance, and the illuminance changes smoothly, which is more preferable. It has been found that having the shape of the ridges as described above is suitable for obtaining a stretched light irradiation image.
  • 32 and 33 show graphs representing the illuminance distributions of Examples 1 and 14.
  • FIG. 32 shows the + Y direction.
  • FIG. 33 shows the ⁇ X direction.
  • the reflection sheet of Example 1 is a diffusion type (Diffuser type) as described above.
  • the reflecting surface has a diffuse reflectance of 90% or more. Such a reflective surface covers the internal reflective surface of the light guide plate.
  • the reflective sheet of Example 14 is a mirror surface type.
  • the reflecting surface is a mirror surface.
  • Such a reflective surface covers the internal reflective surface of the light guide plate.
  • the diffuse reflectance of the reflective surface is preferably 90% or more. It has been found that limiting the reflection surface of the reflection sheet as described above is particularly suitable for increasing the illuminance immediately below the planar light emitting module. Further, the fact that the diffuse reflectance of the reflection sheet influences the illuminance distribution in this way coincides with a large amount of light emitted from the internal reflection surface 42 as shown in FIG.
  • the illuminance distribution in the X-axis direction was also affected.
  • FIG. 34 shows a graph representing the illuminance distribution of Examples 1 and 15 and Comparative Examples 12-13.
  • FIG. 35 is a graph showing the illuminance distribution of Examples 2 and 16-17 and Comparative Example 14-15. 34 and 35 both show the illuminance distribution in the + Y direction.
  • the meandering of the grooves on the deflection surfaces of Examples 1 and 2 is as described above. That is, the unit length Ul of the meandering of the base line of the groove is 0.5 mm. The amplitude of the meandering of the groove baseline is 70 ⁇ m (0.07 mm). The ⁇ value is 0.14. On the other hand, the unit length Ul of the other examples and comparative examples is set to 0.5 mm, which is the same as those of Examples 1 and 2.
  • the meandering amplitude of Comparative Examples 12 and 14 is 30 ⁇ m (0.03 mm). The ⁇ value is 0.06.
  • the meandering amplitude of Comparative Examples 13 and 15 is 50 ⁇ m (0.05 mm). The ⁇ value is 0.10.
  • the amplitude of meandering in Example 16 is 60 ⁇ m (0.06 mm).
  • the ⁇ value is 0.12.
  • the amplitude of meandering in Examples 15 and 17 is 100 ⁇ m (0.10 mm).
  • the ⁇ value is 0.20.
  • FIG. 36 schematically illustrates a cross-sectional feature of the light guide device 90 according to the eighteenth embodiment.
  • the light guide device 90 includes a light guide plate 85.
  • the light guide plate 85 includes a deflection surface 81.
  • the deflection surface 81 is provided with grooves 87a-e.
  • the slope Ob1 on the side closer to the light receiving surface is smaller than the slope Ob2 on the side farther from the light receiving surface.
  • Ob1 is 15 degrees and Ob2 is 40 degrees.
  • Other features of the groove are the same as those in the first embodiment. The same applies to the grooves 87a and ce.
  • FIG. 37 shows a light distribution graph of the planar light emitting module manufactured using the light guide device of Example 18.
  • a light distribution curve 83 is a light distribution curve of the first embodiment.
  • the light distribution curve 84 is the light distribution curve of Example 18.
  • -90 degrees represents the -Y direction shown in FIGS. 1 and 18, and 90 degrees represents the + Y direction shown in FIGS.
  • the light ray 57c is irregularly reflected by the reflection surface 49, and a part thereof is emitted from the slope of the side portion La1 of the groove 87c.
  • Such a mode of emission occurs both in the light guide device 40 according to FIG. 5 and in the light guide device according to the first embodiment. Therefore, as shown in FIG. 37, there is no dramatic change in the light distribution characteristics between the light distribution curve 83 and the light distribution curve 84.
  • the light ray 57d is irregularly reflected by the reflection surface 49, and a part of the light ray e is emitted from a flat surface between the grooves 87d and e. Therefore, in the light distribution curve 83 shown in FIG. 37, the light intensity increases in a region where the angle is smaller than +60 degrees compared to the light distribution curve 84.
  • the light ray 57d is irregularly reflected by the reflecting surface 49, and a part of the light ray 57f is emitted from the side portion La1 of the groove 87e, but is incident again on the side portion La2 of the groove 87e. Therefore, the light beam 57f further propagates in the light guide plate along the light guide direction Gu.
  • the light beam 57f was supposed to be emitted in a high angle direction with respect to the normal direction of the emission surface, but this is hindered by the side portion La2 having a large inclination Ob2. For this reason, in the light distribution curve 83 shown in FIG. 37, the light intensity decreases in a region where the angle is larger than +60 degrees compared to the light distribution curve 84.
  • the slope of the slope farther from the light receiving surface may be reduced.
  • the slope of the slope farther from the light receiving surface is preferably in the range of 12.5 degrees to 20 degrees in accordance with the slope of the slope closer to the light receiving face.
  • Example 18 when light is emitted in a higher angle direction, it is preferable that the slope of the slope farther from the light receiving surface among the slopes of the groove is also in the range of 12.5 degrees to 20 degrees. Indicated. By using such a groove, a planar light emitting module of still another embodiment can be obtained.
  • FIG. 38 is a front view of the planar light emitting module 95 of Example 19.
  • FIG. The planar light emitting module 95 is different from the planar light emitting module 70 shown in FIG. 6 in that the reflecting material 67 is removed and a point light source group 96 facing the end surface 43b is provided.
  • the 38 is provided with two point light source groups.
  • the first point light source group is a point light source group 66.
  • the second point light source group is a point light source group 96.
  • the light guide plate 45 has two incident end faces.
  • the light receiving surface of the end surface 43a is defined as a first light receiving surface.
  • the light receiving surface of the end face 43 a faces the point light source group 66.
  • the light receiving surface of the end face 43b is defined as a second light receiving surface.
  • the light receiving surface of the end face 43 b faces the point light source group 96.
  • the first and second light receiving surfaces face each other with the central portion of the light guide plate 65 interposed therebetween.
  • a deflection surface 41 is provided at the center of the light guide plate 65.
  • the grooves 47a and b provided in the deflection surface 41 shown in FIG. 38 have an average slope in the range of 12.5 degrees to 20 degrees on both the end face 43a side and the end face 43b side. Therefore, the deflection surface 41 functions as a light emitting surface having two emission directions Ex1 and Ex3.
  • the light from the point light source group 66 shown in FIG. 38 is emitted toward the light receiving surface side of the end face 43b along the emission direction Ex1.
  • the light from the point light source group 96 is emitted toward the light receiving surface side of the end face 43a along the emission direction Ex3.
  • 40 light guide device 41 deflection surface, 42 internal reflection surface, 43a end surface, 43b end surface, 44 cross section, 45 light guide plate, 46a-d center, 47a-d groove, 48a valley, 48b mountain, 49b reflection surface, 50 reflection sheet , 51 ridges, 52 arcs, 55 diffusers, 57a-f rays, 58a-c rays, 60 light guides, 61 bottom surfaces, 63 smooth surfaces, 65 light guide plates, 66 point light source groups, 67 reflectors, 68 reflections Sheet, 70 planar light emitting module, 71 deflection surface, 75 light guide device, 77a-d linear groove, 80 illuminated surface, 81 deflection surface, 83 light distribution curve, 84 light distribution curve, 85 light guide plate, 87a- e Groove, 90 light guide device, 95 optical module, 96 point light source group An angle, Bc1-2 emission direction, B1 bottom bottom, Bu top bottom, Co comparison example, Dp depth, Dx light distribution curve, Dy light distribution curve,

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)

Abstract

L'invention concerne un dispositif de guidage de lumière (40) qui comprend une plaque de guidage de lumière (45) et une feuille de réflexion (50). La plaque de guidage de lumière (45) possède : une surface d'extrémité incidente (43a) ayant une surface de réception de lumière ; une surface de base inférieure ayant une surface de déviation (41) ; une surface de base supérieure ayant une surface de réflexion interne (42). La feuille de réflexion (50) fait face à la surface de réflexion interne (42). La surface de déviation (41) possède une pluralité de rainures. Lorsque la plaque de guidage de lumière (45) est vue dans la vue en plan, les rainures (47a-d) forment un méandre régulier. La surface de base supérieure possède également des arêtes saillantes (51) disposées dans la surface de réflexion interne (42). Dans une section transversale parallèle à la direction normale de la surface de réception de lumière et à la direction normale d'un plan de référence (Ps) dans lequel la plaque de guidage de lumière (45) s'étend, le gradient moyen d'une section latérale de lignes de contour des rainures (47a-d) par rapport au plan de référence (Ps) est de 12,5 à 20° sur le côté de surface de réception de lumière.
PCT/JP2018/008532 2017-03-06 2018-03-06 Dispositif de guidage de lumière WO2018164108A1 (fr)

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JP2017-042032 2017-03-06

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2022071790A (ja) * 2020-10-28 2022-05-16 アイリスオーヤマ株式会社 電気掃除機

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Publication number Priority date Publication date Assignee Title
JP2005500651A (ja) * 2001-08-15 2005-01-06 スリーエム イノベイティブ プロパティズ カンパニー バックライト式ディスプレイと共に使用される導光板
JP2008218418A (ja) * 2008-03-31 2008-09-18 Mitsubishi Rayon Co Ltd 面光源装置及びそれに用いる導光体
JP2011040369A (ja) * 2009-06-01 2011-02-24 Skc Haas Display Films Co Ltd 方向変換膜システムのための導光板
JP2015115253A (ja) * 2013-12-13 2015-06-22 王子ホールディングス株式会社 導光板

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005500651A (ja) * 2001-08-15 2005-01-06 スリーエム イノベイティブ プロパティズ カンパニー バックライト式ディスプレイと共に使用される導光板
JP2008218418A (ja) * 2008-03-31 2008-09-18 Mitsubishi Rayon Co Ltd 面光源装置及びそれに用いる導光体
JP2011040369A (ja) * 2009-06-01 2011-02-24 Skc Haas Display Films Co Ltd 方向変換膜システムのための導光板
JP2015115253A (ja) * 2013-12-13 2015-06-22 王子ホールディングス株式会社 導光板

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2022071790A (ja) * 2020-10-28 2022-05-16 アイリスオーヤマ株式会社 電気掃除機
JP7145527B2 (ja) 2020-10-28 2022-10-03 アイリスオーヤマ株式会社 電気掃除機

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