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WO2018186413A1 - Corps de guidage de lumière et module électroluminescent plan - Google Patents

Corps de guidage de lumière et module électroluminescent plan Download PDF

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Publication number
WO2018186413A1
WO2018186413A1 PCT/JP2018/014303 JP2018014303W WO2018186413A1 WO 2018186413 A1 WO2018186413 A1 WO 2018186413A1 JP 2018014303 W JP2018014303 W JP 2018014303W WO 2018186413 A1 WO2018186413 A1 WO 2018186413A1
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WO
WIPO (PCT)
Prior art keywords
groove
primary
light
primary groove
light guide
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PCT/JP2018/014303
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English (en)
Japanese (ja)
Inventor
誠二 木下
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株式会社クラレ
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Publication date
Application filed by 株式会社クラレ filed Critical 株式会社クラレ
Publication of WO2018186413A1 publication Critical patent/WO2018186413A1/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 and a planar light emitting module.
  • Patent Document 1 discloses an edge light type lighting device.
  • FIG. 25 shows an exploded perspective view of such an illuminating device, cited from the same document.
  • an illuminating device In such an illuminating device 1, light enters the light guide plate 2 from an LED (light emitting diode) 8 included in the light emitting units 3 a and 3 b arranged on the side surfaces 2 a and b of the light guide plate 2.
  • LED light emitting diode
  • the illumination device 1 light is emitted from the main surface 2 d of the light guide plate 2.
  • the reflective sheet 4, the diffusion sheet 5, and the ridges 7 provided on the main surface 2d are drawn.
  • a plurality of recesses 6 extending in the X-axis direction are formed at a predetermined pitch on the bottom surface 2c of the light guide plate 2 shown in FIG. Due to the recess 6, the light changes its direction at the bottom surface 2c and proceeds toward the main surface 2d.
  • the cross-sectional shape of the recess 6 predetermined, light is emitted from the main surface 2d of the light guide plate 2 while diffusing, and further diffused and emitted by the diffusion sheet 5. The change in luminance on the light emitting surface when viewed while changing the viewing angle can be mitigated.
  • glare is likely to occur when LED light sources arranged at intervals like the light emitting units 3a and 3b are used.
  • glare is observed at a predetermined viewing angle, if there is a difference between a portion that emits light strongly and a portion that emits light weakly, the glare is strongly recognized in the portion that emits light strongly. It is an object of the present invention to suppress luminance unevenness on the exit surface of a light guide serving as a light emitting surface, and to suppress glare generated in a planar light emitting module including a side light receiving type light guide.
  • a light guide having a plate shape and having a side surface having a light receiving surface, a lower bottom surface having a deflection surface, and an upper bottom surface having a light emitting surface,
  • the deflection surface has a plurality of compound grooves parallel to each other,
  • the composite grooves are sequentially arranged in a direction from the side closer to the light receiving surface toward the side farther from the light receiving surface,
  • the composite groove has a primary groove P and a secondary groove S shallower than the primary groove P,
  • the primary groove P meanders smoothly,
  • the meandering phase of the primary groove is irregularly shifted between the plurality of composite grooves,
  • the contour line of the primary groove P in the reference cross section The inclination angle formed by the tangent line with respect to the reference plane monotonously decreases as the depth in the primary groove P
  • the secondary groove S is disposed closer to the light receiving surface than the primary groove P and meanders along the meandering phase of the primary groove P. In the reference cross section, the secondary groove S narrows according to the depth.
  • Light guide. [2] When light enters a light receiving surface of the light guide from a light source, A part of the incident light is reflected on the virtual smooth surface when there is a virtual smooth surface at the position of the secondary groove S, and further reflected on the primary groove P. Following a virtual optical path that exits from the light emitting surface, Since the secondary groove S is on the virtual optical path, the light that follows the virtual optical path is reflected by the secondary groove S before being reflected by the primary groove P, thereby Deviate, The light guide according to [1].
  • [3] Project the plurality of primary grooves P onto the reference cross section, respectively, and set L as the closest distance in the normal direction of the light receiving surface of the projection of the adjacent primary groove P, and the maximum depth of the primary groove P When VH L / VH ⁇ 15
  • the light guide according to any one of [1] to [3].
  • the inclination angle of the primary groove P changes monotonously and smoothly in a range of at least 30 degrees to 70 degrees
  • the average inclination of the slope of the secondary groove S on the side farther from the primary groove P with respect to the reference plane is 15 degrees or more and 70 degrees or less
  • the average slope of the inclined surface of the secondary groove S closer to the primary groove P with respect to the reference plane is 15 degrees or more and 70 degrees or less.
  • the tertiary groove T is shallower than the primary groove P, is disposed between the primary groove P and the secondary groove S, and has a meandering phase between the primary groove P and the secondary groove S. Meander along In the reference cross section, the tertiary groove T becomes narrow according to the depth.
  • the light guide according to any one of [1] to [6].
  • the inclination angle of the primary groove P changes monotonously and smoothly in a range of at least 30 degrees to 70 degrees, In the reference cross section, the average inclination of the inclined surface of the tertiary groove T closer to the primary groove P with respect to the reference plane is not less than 5 degrees and not more than 60 degrees.
  • the composite groove further includes a secondary groove U and a tertiary groove V that are paired with the secondary groove S and the tertiary groove T, respectively, and are shallower than the primary groove P.
  • the secondary groove U is disposed on a side farther from the light receiving surface than the primary groove P, and meanders along the meandering phase of the primary groove P.
  • the secondary groove U narrows according to the depth
  • the tertiary groove V is disposed between the primary groove P and the secondary groove U, and meanders along the meandering phase of the primary groove P and the secondary groove U, In the reference cross section, the tertiary groove V becomes narrow according to the depth.
  • the primary groove P has a symmetrical shape
  • the secondary groove S and the tertiary groove T, and the secondary groove U and the tertiary groove V are in a symmetrical position with respect to the primary groove P and have a symmetrical shape.
  • a planar light emitting module comprising the light guide according to any one of [1] to [11] 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.
  • the present invention can suppress luminance unevenness on the light exit surface of the light guide, and can suppress glare generated in the planar light emitting module including the side light receiving type light guide.
  • FIG. 1 It is a perspective view which shows one Embodiment of the light guide of this invention. It is a perspective view which shows one Embodiment of the planar light emitting module of this invention. It is a schematic diagram of the contour line of the composite groove in a cross-sectional view. It is a schematic diagram explaining angle (theta) and (phi) in this specification. It is a schematic diagram which shows an example of the virtual optical path of the incident light reflected on a lower bottom face. It is a schematic diagram which shows another example of the virtual optical path of the incident light reflected on a lower bottom face. It is a schematic diagram which shows another example of the virtual optical path of the incident light reflected on a lower bottom face. In the example of FIG.
  • FIG. 7 it is a schematic diagram which shows an example of the optical path when a groove
  • FIG. It is a figure in the light guide of Example 2 which shows the outline of the compound groove which carried out the cross sectional view. It is a figure which shows the outline of the compound groove which carried out the cross sectional view in the light guide body of Example 3 and 4.
  • FIG. It is a figure which shows the outline of the composite groove
  • FIG. 6 It is a front view with which it uses for description of the meandering of the composite groove
  • 6 is a graph showing measurement results of hot spot levels in Examples 1 to 3 and Comparative Example 1. 6 is a graph showing measurement results of hot spot levels in Examples 4 to 6 and Comparative Example 1. 6 is a graph showing measurement results of hot spot levels in Examples 7 to 9 and Comparative Example 1. 6 is a graph showing measurement results of hot spot levels in Examples 10 to 12 and Comparative Example 1.
  • 5 is a schematic diagram for explaining a closest distance L of a primary groove P.
  • FIG. It is a figure which shows an example of the light guide which has a meandering groove
  • the plane in which the plate-shaped light guide spreads is defined as a reference plane (xy plane), the direction in which light enters the light guide from the light source is the y axis, and the direction perpendicular to the y axis is x.
  • the normal direction of the xy plane is the z axis.
  • the positive direction of each axis is taken to be a left-handed system based on the direction of the y-axis.
  • the angle formed by the optical path of the emitted light and the z axis is defined as ⁇
  • the angle formed by the projection of the optical path of the emitted light onto the xy plane and the x axis is defined as ⁇ .
  • FIG. 24 shows the planar light emitting module 18 including the light guide 10 having meandering grooves.
  • the planar light emitting module 18 shown in the example of FIG. 24 includes a light guide 10 and light sources 30a-d.
  • the light guide 10 shown in FIG. 24 has a plate shape, the side surface 11a has a light receiving surface, and the lower bottom surface 12 has grooves 15a-d that are substantially V-shaped concave stripes.
  • the lower bottom surface 12 exhibits the function of a deflection surface by a groove.
  • the lower bottom surface 12 has a plurality of grooves, but the grooves 15a-d do not intersect each other, and the grooves 15a-d meander smoothly.
  • the meandering phases of the grooves 15a-d are irregularly shifted from each other.
  • the upper bottom surface 13 of the light guide 10 has a light emitting surface. Even when a light source arranged at intervals like an LED in a row is used by such a light guide, a portion that emits light strongly and a portion that emits light weakly become unclear, and glare occurs. It is suppressed.
  • Such emitted light generates a periodic pattern in which the luminance on the light emitting surface repeats intensity corresponding to the LED array pattern of the light source as shown in FIG.
  • the present invention has been made on the basis of such knowledge, and provides a light guide body in which luminance unevenness in the specific direction is reduced by diverting light incident on a primary groove by a secondary groove or the like. It is.
  • the light guide and the planar light emitting module of the present invention will be described in detail.
  • FIG. 1 is a perspective view showing an embodiment of a light guide.
  • the light guide 20 shown in FIG. 1 has a plate shape.
  • the plate shape includes side surfaces 21a and 21b having a light receiving surface on which point light source groups are arranged in a planar light emitting module described later, a lower bottom surface 22, and an upper bottom surface 23.
  • the direction in which the plate shape formed by the light guide 20 extends is defined as a reference plane 28.
  • the light receiving surface may be the entire side surface or a part of the side surface. Further, the light receiving surface may be either the side surface 21a or 21b, or may be both sides of the side surface 21a and the side surface 21b.
  • the upper bottom surface 23 shown in FIG. 1 has a light emitting surface.
  • the entire upper bottom surface 23 is a light emitting surface.
  • the light emitting surface may be a part of the upper bottom surface 23.
  • the upper bottom surface 23 and the side surfaces 21a, b may be perpendicular to each other.
  • the upper bottom surface 23 and the side surfaces 21a and 21b may or may not intersect with each other.
  • the cross section 24 is parallel to the normal of the reference plane. In the drawing, the cross section 24 is perpendicular to the side surfaces 21a, 21b and the reference plane.
  • the entire lower bottom surface 22 is a deflection surface.
  • the deflection surface may be a part of the lower bottom surface 22.
  • the lower bottom surface 22 and the side surfaces 21a and 21b may be perpendicular to each other.
  • the lower bottom surface 22 and the side surfaces 21a and 21b may or may not intersect each other.
  • the lower bottom surface 22 has a plurality of composite grooves 27a-27c parallel to each other.
  • the composite grooves 27a-27c do not cross each other.
  • the lower bottom surface 22 exhibits the function of a deflection surface mainly by the primary groove P.
  • the primary groove P is a substantially V-shaped groove that narrows in accordance with the depth in the reference cross section.
  • the lower bottom surface 22 has a plurality of primary grooves P, but the number is not limited. In the figure, three primary grooves P are illustrated.
  • the composite grooves P27a-27c shown in FIG. 1 are arranged in order from the vicinity of the light receiving surface 21a toward the far side of the light receiving surface.
  • the primary grooves P (25a-25c) meander smoothly.
  • the meandering phases of the primary grooves P (25a-25c) are irregularly shifted from each other.
  • the primary grooves P (25a-25c) are preferably parallel to each other.
  • a secondary groove S (26a-26c) is disposed closer to the light receiving surface 21a than the primary groove P (25a-25c), and the primary groove P (25a-25c) is arranged.
  • Serpentine along the meandering phase since there is a secondary groove S on the virtual optical path of the reflected light at the lower bottom surface 12 as shown in FIG. 5, the light that follows the virtual optical path is reflected by the primary groove P before being reflected by the primary groove P. Reflecting at the secondary groove S deviates from the primary groove P, so that the light emitted in the specific direction described above is suppressed.
  • FIG. 3 is a schematic diagram of a contour line of one composite groove in a cross-sectional view.
  • the composite groove has a secondary groove S at least on the light source side of the primary groove P and the primary groove P.
  • a tertiary groove T may be provided between the primary groove P and the secondary groove S, and a secondary groove U and a tertiary groove V may be provided on the opposite side of the primary groove P from the light source.
  • Each groove constituting the composite groove in the cross section parallel to the ZY plane has a substantially V-shaped outline.
  • the contour line may be a straight line or may be smoothly curved.
  • the innermost part of the substantially V shape does not need to have an angle.
  • the innermost part may be a gentle curve or flat as in the example of FIG.
  • the center line of the substantially V-shaped groove is preferably perpendicular to the reference plane 28.
  • the center line is preferably parallel to the Z axis.
  • channel so that it may become left-right symmetric in a cross section. With this aspect, it is possible to suppress the deviation of the emitted light.
  • the maximum depth of the primary groove P can be 0.002 to 0.1 mm, but is not limited thereto.
  • the depth direction may be parallel to the Z axis.
  • the width H of the primary groove P can be 0.003 to 0.2 mm, but is not limited thereto.
  • the inclination angle of the primary groove P is, for example, in a range from 30 degrees to 70 degrees.
  • the distance between points furthest from the primary groove P, that is, P2 in FIG. 3, is preferably 2.5 or more and 12.0 or less.
  • the point is at the maximum depth of the primary groove P, and is the point corresponding to the edge of the secondary groove S from the point closest to the secondary groove S.
  • the distance between points furthest from the primary groove P, that is, P3 in FIG. 3, is preferably 2.6 or more and 14.0 or less.
  • the slope on the side farther from the primary groove P of the secondary groove S is steeper than the slope on the side near the primary groove.
  • the inclination angle of the primary groove P on the secondary groove S side preferably changes monotonously and smoothly in a range from 30 degrees to 70 degrees.
  • the secondary groove S in the reference cross section is also preferable.
  • the average slope of the slope far from the primary groove P with respect to the reference plane, that is, the angle of R4 in FIG. 3 is preferably 15 degrees or more and 70 degrees or less, and the secondary groove S in the reference section It is preferable that the average inclination of the slope closer to the primary groove P with respect to the reference plane, that is, the angle R3 in FIG. 3 is 15 degrees or more and 70 degrees or less.
  • the composite groove may further include a tertiary groove T, and the tertiary groove T may be disposed between the primary groove P and the secondary groove S in the composite groove. It is preferable that the slope on the side farther from the primary groove P of the tertiary groove T is steeper than the slope on the side near the primary groove.
  • the tertiary groove T is preferably in contact with the primary groove P. It is preferable that the inclination angle of the primary groove P on the secondary groove S side changes monotonously and smoothly in a range from 30 degrees to 70 degrees, and in this case, the primary groove of the tertiary groove T in the reference cross section is preferable.
  • the average inclination of the slope closer to the groove P with respect to the reference plane, that is, the angle R1 in FIG. 3, is preferably 5 degrees or more and 60 degrees or less. Further, it is preferable that the average inclination of the inclined surface of the tertiary groove T far from the primary groove P with respect to the reference plane, that is, the angle R2 in FIG. 3 is not less than 5 degrees and not more than 67 degrees.
  • the composite groove may further have a secondary groove U and a tertiary groove V that are shallower than the primary groove P, which are paired with the secondary groove S and the tertiary groove T, respectively. Even when the light receiving surfaces are provided on both sides, uneven brightness is suppressed.
  • the primary groove P has a symmetrical shape
  • the secondary groove S and the tertiary groove T, and the secondary groove U and the tertiary groove V are in a symmetrical position with respect to the primary groove P and have a symmetrical shape. preferable.
  • the primary groove P, the secondary grooves S and U, and the tertiary grooves T and V are preferably substantially V-shaped concave stripes that are narrowed according to the depth in the reference cross section.
  • FIG. 23A and 23B are schematic views for explaining the closest distance L of the primary groove P.
  • FIG. 23A is a view of the light guide 20 viewed from the upper bottom surface 53 side
  • FIG. 23B is a view of the light guide 20. It is the figure seen from the reference
  • FIG. 23A the primary grooves P (51a-51f) are shown, and the secondary grooves and the tertiary grooves are omitted.
  • FIG. 23B shows the projection (52a-52f) of the primary groove P onto the reference cross section 54.
  • FIG. 23A is a view of the light guide 20 viewed from the upper bottom surface 53 side
  • FIG. 23B is a view of the light guide 20. It is the figure seen from the reference
  • FIG. 23A the primary grooves P (51a-51f) are shown, and the secondary grooves and the tertiary grooves are omitted.
  • FIG. 23B shows the projection (52a-52
  • L is the closest distance in the normal direction from the light receiving surface 55 of the projection of the adjacent primary groove P.
  • the adjacent primary groove 51a and primary groove 51b in FIG. 23 from the point 56a farthest from the light receiving surface in the normal direction (hereinafter referred to as the Y-axis direction) from the light receiving surface 55 of the projection 52a, from the light receiving surface of the projection 52b.
  • the distance to the nearest point 56b is set as the closest distance L1.
  • the closest distances L2 to L5 are determined in the same manner. In FIG. 23, the closest distances L2 and L4 are smaller than L1, L3, and L5.
  • the positions of the maximum depth VH of the primary groove 51b and the primary groove 51c are particularly close in the region A.
  • the primary groove 51c is behind the primary groove 51b and light from the light source is less likely to hit as compared with other primary grooves. For this reason, the emission of this portion becomes weak, and a dark line streak may appear between the primary groove 51b and the primary groove 51c.
  • the primary groove 51d and the primary groove 51e have a relatively short closest distance L4, but the maximum depth VH of the primary groove 51d and the primary groove 51e is not so close as shown in the region B. .
  • the primary groove 51d and the primary groove 51e each reflect light. For this reason, in this portion, the emission becomes stronger, and a bright line streak may appear between the primary groove 51d and the primary groove 51e.
  • the dark line streaks and bright line streaks can be eliminated by increasing the closest distance L.
  • the maximum depth VH of the primary groove P and the closest distance L are determined from the viewpoint of further suppressing uneven brightness on the emission surface.
  • L / VH ⁇ 15 is preferably satisfied, L / VH ⁇ 18 is more preferable, and L / VH ⁇ 20 is more preferable.
  • FIG. 2 shows a planar light emitting module.
  • the planar light emitting module 40 includes the light guide 20 and a light emitting unit 33 a having light sources 30 a to 30 d serving as a point light source group.
  • the light emitting unit 33a included in the planar light emitting module 40 includes a plurality of light sources, but the number is not limited. In the figure, four light sources are illustrated.
  • the light guide 20 has a composite groove, but is omitted in FIG. 2 includes 33b in addition to the light emitting unit 33a, the following description regarding FIG. 2 applies to both the case of only the light emitting unit 33a and the case of having both 33a and 33b.
  • FIG. 2 is an example of a lighting device, and the lighting device of the present embodiment is not limited to these.
  • the planar light emitting module shown in FIG. 2 can be used as it is as a lighting device.
  • the direction in which the lighting device is installed is not limited.
  • the lighting device 40 may be installed on the ceiling so that the light emitting surface formed by the upper bottom surface 23 faces downward in the vertical direction.
  • the light emitting surface formed by the upper bottom surface 23 is a surface having the ridges 37.
  • the height of the ridges 37 can be 10 to 500 ⁇ m, preferably 10 to 50 ⁇ m.
  • the height of the ridges 37 may not be constant.
  • the ridges 37 in the figure are lenticular lenses.
  • the arc may be a semicircle.
  • the inclination angle of the ridge 37 with respect to the light emitting surface or the reference plane 28 can be 0 to 85 °.
  • the ridges 37 are parallel to each other.
  • the interval between the ridges 37 can be 10 to 300 ⁇ m.
  • the ridges 37 are preferably perpendicular to the light receiving surface formed by the side surfaces 21a and 21b.
  • the ridge 37 can be a straight line parallel to the normal of the light receiving surface.
  • the reflective material 34 may or may not be provided so as to cover the deflection surface formed by the lower bottom surface 22.
  • the reflective surface of the reflective material 34 may be diffusive while facing the deflecting surface.
  • the reflecting surface having diffusibility is, for example, a non-mirror surface.
  • the reflective material 34 may be a reflective sheet. Further, the reflecting surface of the reflecting member 34 may be a mirror surface and may face the deflecting surface. Even in this aspect, the same effect as described above can be obtained.
  • the lighting device can also emit light from the deflection surface.
  • the space under the ceiling can be illuminated by the light emitting surface, and the ceiling can also be illuminated by the deflecting surface.
  • the diffusing material 35 may or may not be provided so as to cover the light emitting surface formed by the upper bottom surface 23 shown in FIG.
  • the diffusing material 35 may cover the side end of the light guide 20.
  • the diffusion material 35 may be a diffusion plate or a diffusion sheet.
  • the thickness of the diffusing material 35 can be 0.1 to 3 mm.
  • the surface of the diffusing material 35 may be a mirror surface. Such a surface may have a texture.
  • the loss of energy of light emitted from the light emitting surface can be suppressed by not providing the diffusing material 35 facing the light emitting surface formed by the upper bottom surface 23.
  • a transparent material may be used instead of the diffusing material 35. The transparent material can protect the light emitting surface while suppressing loss of light energy.
  • the total light transmittance (T. T) of the diffusing material 35 is preferably 70% or more.
  • the haze value of the diffusing material 35 is preferably 80% or more.
  • the planar light emitting module 40 may include rod-like light source units 33a and 33b having light sources 30a-d.
  • the light guide 20 further has a side surface 21b.
  • the side surface 21b faces the side surface 21a.
  • the side surface 21b faces the light source unit 33b.
  • the light source unit 33b faces the light source unit 33a with the light guide 20 interposed therebetween.
  • the light source unit 21b has the same configuration as the light source unit 21a. For this reason, the light emitting surface formed by the upper bottom surface 23 can be uniformly emitted by the light source units 33a and 33b.
  • the diffusion material 35 was not installed. In this embodiment, a 569 mm square light guide is used. However, as shown in FIG. 19, the periphery of the light guide 20 is covered with a frame 42.
  • the frame covers 6.5 mm of each side of the light guide 20.
  • the luminance was measured using a 556 mm square that is not covered by the frame 42 of the light guide 20 as the light emitting area 43.
  • FIG. 19 The upper part of FIG. 19 is a front view of the drawing light emitting module 40.
  • the lower part of FIG. 19 is a side view of the planar light emitting module 40.
  • FIG. 20 is a front view of the light guide 20 used for explaining the meandering of the composite groove.
  • the light guide 20 in plan view has a square or rectangular shape. In this embodiment, a 569 mm square light guide is used.
  • the thickness of the light guide 20 shown in FIG. 20 can be 1 to 8 mm. In the present embodiment, the thickness of the light guide is 3 mm.
  • the meandering of the composite groove 27 is represented by a base line representing the center of the primary groove P.
  • the secondary and tertiary grooves of the composite groove are omitted.
  • a plurality of composite grooves are provided between the side surface 21b and the side surface 21a.
  • the light sources such as the light sources 30a-d shown in FIG. 20 are each composed of LEDs and constitute a light source group 33a.
  • the light source group 33b is located on the opposite side of the light source group 33a with the light guide 20 interposed therebetween.
  • the light source group 33b faces the side surface 21b.
  • the light receiving surface formed by the side surface 21b and the side surface 21a is perpendicular to the light emitting surface formed by the upper bottom surface.
  • the linear light source groups 33 a and 33 b are arranged on the side edges of the light guide 20.
  • a lenticular lens having an aspect ratio of 20% is provided on the light emitting surface formed by the upper bottom surface.
  • the height of the lenticular lens is 12.5 ⁇ m, the width is 50 ⁇ m, and the pitch is 50 ⁇ m.
  • the composite grooves 27a-d meander smoothly.
  • the meandering phases of each composite groove are irregularly shifted from each other.
  • the composite grooves 27a-d are formed of curved surfaces that form smooth concave surfaces.
  • the inclination angle formed by the tangent to the contour line of the groove with respect to the reference plane may monotonously decrease as the depth in the groove increases.
  • FIG. 21 schematically shows the base line and the contour line 29 of the primary groove 25a in plan view.
  • a contour line 29 that intersects the base line of the primary groove 25a is continuously represented.
  • the meandering shape of the primary groove 25a is a so-called sine curve.
  • the meandering shape may be a parabola.
  • the secondary groove and the tertiary groove are omitted, but the secondary groove and the tertiary groove are formed along the primary groove to constitute a composite groove.
  • the pitch P shown in FIG. 20 is the meandering pitch of the composite groove 27a.
  • the meandering pitch P is a so-called meandering wavelength.
  • the meandering width M is the meandering width of the meandering of the composite groove 27a.
  • the meandering width is a so-called meandering amplitude.
  • the interval between the composite grooves is preferably larger than twice the meandering width M.
  • the distance between the centers of the primary grooves is preferably larger than (meander width M) ⁇ 2 + (width of the composite groove).
  • the distance between the centers of the primary grooves is preferably less than 2 mm.
  • the meandering width M may be 200 ⁇ m or less.
  • FIG. 9 to 17 show the cross-sectional shapes of the composite grooves of Comparative Example 1 and Examples 1 to 12.
  • FIG. 9 to 17, the depth and width are both normalized with the maximum depth of the primary groove being 4 ⁇ m.
  • Table 3 shows details of the shape of the composite groove.
  • symbol in Table 3 uses the code
  • FIG. 18 plots the luminance against X at Y of 1 mm, 5 mm, and 9 mm.
  • C A reduction effect at the light emitting area boundary was recognized, and the distance at which the hot spot level was 0.15 or less was more than 17 mm and 20 mm or less.
  • D Although a reduction effect at the light emitting area boundary was recognized, the distance at which the hot spot level was 0.15 or less was more than 20 mm.
  • E The reduction effect at the light emitting area boundary could not be confirmed. If the hot spot level is 0.15 or less, streaky luminance unevenness is not visually observed. If the hot spot elimination comprehensive evaluation is A to D, the planar light emitting module can be used without any problem in practice.

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

Abstract

L'invention se propose de supprimer l'éblouissement qui se produit dans un module électroluminescent plan comprenant un corps de guidage de lumière recevant de la lumière sur une surface latérale. Un corps de guidage de lumière comporte une pluralité de rainures composites (27) alignées les unes avec les autres, les rainures composites ayant chacune une rainure primaire P (25) et une rainure secondaire S (26) qui est moins profonde que la rainure primaire P, la rainure primaire P serpentant en douceur, les phases du méandre de la rainure primaire parmi la pluralité de rainures composites (27) étant déplacées de manière irrégulière l'une par rapport à l'autre, et lorsqu'un plan d'élargissement tabulaire est défini comme un plan de référence (28) et qu'une section transversale, qui est parallèle à la ligne normale de la surface de réception de lumière et à la ligne normale du plan de référence, est définie comme une section transversale de référence, l'angle d'inclinaison dans la section transversale de référence, formé par la tangente de la ligne de contour de la rainure primaire P par rapport au plan de référence, diminue de manière monotone lorsque la profondeur dans la rainure primaire P augmente, et varie sans à-coups en fonction de la profondeur, la rainure secondaire S de la rainure composite étant disposée plus près de la surface de réception de lumière que la rainure primaire P et sinueuse le long de la phase du méandre de la rainure primaire P, et la rainure secondaire S devenant plus étroite avec la profondeur dans la section transversale de référence.
PCT/JP2018/014303 2017-04-04 2018-04-03 Corps de guidage de lumière et module électroluminescent plan WO2018186413A1 (fr)

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JP2017074800 2017-04-04

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1039302A (ja) * 1996-05-09 1998-02-13 Matsushita Electric Ind Co Ltd 面状照明系
JP2008021659A (ja) * 2001-07-27 2008-01-31 Enplas Corp 面光源装置、画像表示装置及び導光板
JP2009087916A (ja) * 2007-10-02 2009-04-23 Samsung Electronics Co Ltd バックライトアセンブリ

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1039302A (ja) * 1996-05-09 1998-02-13 Matsushita Electric Ind Co Ltd 面状照明系
JP2008021659A (ja) * 2001-07-27 2008-01-31 Enplas Corp 面光源装置、画像表示装置及び導光板
JP2009087916A (ja) * 2007-10-02 2009-04-23 Samsung Electronics Co Ltd バックライトアセンブリ

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