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WO1992016871A1 - Dispositif de visualisation du type par projection - Google Patents

Dispositif de visualisation du type par projection Download PDF

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Publication number
WO1992016871A1
WO1992016871A1 PCT/JP1992/000307 JP9200307W WO9216871A1 WO 1992016871 A1 WO1992016871 A1 WO 1992016871A1 JP 9200307 W JP9200307 W JP 9200307W WO 9216871 A1 WO9216871 A1 WO 9216871A1
Authority
WO
WIPO (PCT)
Prior art keywords
projection
screen
light
display device
image
Prior art date
Application number
PCT/JP1992/000307
Other languages
English (en)
Japanese (ja)
Inventor
Noboru Ninomiya
Junichiro Shinozaki
Masaki Ishikawa
Akihito Tanimoto
Original Assignee
Seiko Epson Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to US07/949,243 priority Critical patent/US5422691A/en
Application filed by Seiko Epson Corporation filed Critical Seiko Epson Corporation
Priority to JP50641892A priority patent/JP3218604B2/ja
Publication of WO1992016871A1 publication Critical patent/WO1992016871A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/74—Projection arrangements for image reproduction, e.g. using eidophor
    • H04N5/7416—Projection arrangements for image reproduction, e.g. using eidophor involving the use of a spatial light modulator, e.g. a light valve, controlled by a video signal
    • H04N5/7441—Projection arrangements for image reproduction, e.g. using eidophor involving the use of a spatial light modulator, e.g. a light valve, controlled by a video signal the modulator being an array of liquid crystal cells
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/005—Projectors using an electronic spatial light modulator but not peculiar thereto
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/005—Projectors using an electronic spatial light modulator but not peculiar thereto
    • G03B21/006—Projectors using an electronic spatial light modulator but not peculiar thereto using LCD's
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/132—Overhead projectors, i.e. capable of projecting hand-writing or drawing during action

Definitions

  • the optical system for enlarging and projecting using a light valve is housed in a cabinet, and the rear projection is made on a screen provided on the front of the cabinet.
  • a display device of a display type that allows an enlarged image to be viewed from the front of the cabinet has been provided.
  • a conventional rear-projection display device using this type of light valve is a transmissive liquid crystal display device, as seen, for example, in Japanese Utility Model Laid-Open Publication No.
  • the light source power and illumination are applied to the valve, and the image displayed on the LCD light valve is enlarged by the projection lens and the light path is increased by the reflection mirror.
  • This is a structure that converts the light to the back of the screen. By doing so, the entire projection optical system is housed in the cabinet and can be moved to any place, and even in a bright room, it can be screened. You can see the image above.
  • the oblique projection method can be considered.
  • the image of a tilted object due to the lens has trapezoidal distortion, as shown in USP 751, 347, T. Schei mp ⁇ ug force.
  • the object plane 43 inclined as shown in FIG. 13 forms an image on the image plane 45 inclined by the lens 44.
  • the extension of the object plane 43, the lens 44, and the extension of the image plane 45 coincides with each other as shown in FIG.
  • Let g be the point of intersection of the image plane 45 with the perpendicular to the light source Z at the image side focal point f of the lens 44.
  • the image ABCD on the square object plane shown in Fig. 14 Is formed on the image plane 45 by the lens 44 as a trapezoid ABCD shown in FIG. 15.
  • a light valve 46, a first projection lens 47, and a second projection lens 4 as shown in FIG. 16 are used. 9 and the scan click rie down 5 0 against the Z-axis angles 0 i, ⁇ 2, ⁇ . , You to Let 's you place 0 4's only tilting the by.
  • the line of intersection g between the plane parallel to the first projection lens 47 and the image plane 48 having a trapezoidal distortion passes through the image-side focal point f1 of the first projection lens 47.
  • the intersection g ′ between the plane parallel to the second projection lens 49 through the object-side focal point f 2 of the second projection lens 49 and the image plane 48 having a trapezoidal distortion.
  • the image of the light knob 46 of the square ABCD shown in FIG. 17 is formed by the first projection lens 47.
  • the image ABCD has a trapezoidal distortion as shown in Fig. 18 but the projection lens 49 of Fig. 2 shows the image ABCD on the screen 5 ⁇ .
  • the projection optical system is imaged on the image ABCD without trapezoidal distortion shown in Fig. 12, and as shown in Fig. 12, as shown in Fig. 12, mirror 1 of mirror 4 and mirror 2 of mirror 2 If it is bent in accordance with 41 and stored in the cabinet 38, a thin rear-projection display device can be constructed.
  • reference numeral 39 denotes a projection optical unit.
  • the focal length of the first projection lens 47 shown in FIG. 16 is reduced in order to eliminate trapezoidal distortion, and The diameter of the nozzle becomes smaller.
  • the light source 51 and the light condensed by the condenser lens 52 illuminate the light valve 46 with the power ⁇ Required.
  • light enters at different angles 0 i and ⁇ 0 above and below the light valve 46, and
  • the problem is that the light transmittance of the light valve 46 varies depending on the angle of incidence, and that the brightness on the image on the screen 50 becomes uneven. There is.
  • a conventional rear-projection type display device using this type of light valve has a light source as disclosed in, for example, Japanese Patent Application Laid-Open No. Hei 3-05251.
  • the image displayed on the light valve is illuminated by the light source, enlarged by the projection lens, and the optical path is changed by the reflection mirror to change the light path. It is configured to guide the oblique force on the back of the mirror, but the reflective mirror is a flat reflective mirror 55 as shown in Fig. 42. ing .
  • the projection lens and the reflective mirror may be used, as shown in Fig. 43.
  • the upper image 56 may be distorted or the required enlargement ratio may not be obtained.
  • Fig. 50 The structure shown in Fig. 50 is available.
  • Fig. (A) shows the transmission screen in a perspective view
  • Fig. (B) shows the transmission screen.
  • 3 shows a cross section of the component.
  • Video Projector 5 7 The light image projected from this is focused on the front side by the minute prism array 5Sa formed on the back surface of the transmission screen 58.
  • the prism apex angle of each prism constituting the minute prism array 58a is formed at 52 ° as shown in the figure.
  • the light image focused on the front side reaches the human eye 59, and the light image projected from the video projector 57 is recognized.
  • the mechanism by which ghosts are generated can be considered as follows. That is, as shown in Fig. 51, a shielding sheet 60 is applied to the light incident surface side of the transmission screen 58, and this shielding screen is applied.
  • the prism array 58a described above is formed on the light incident surface side to which the gate 60 is applied. Light incident from the direction indicated by the arrow is totally reflected by the exit surface 58b of the screen 58, and further refracted by the prism array on the back side of the shielding sheet 60. Bend. The bent light reaches the human eye 59 via the output surface 58b.
  • the light incident surface is covered with the black shielding sheet 60 and is originally dark Specifically, the black part is to be seen brightly by the human eye 59, and specifically, the part that must originally be black is glowing red. It can be seen and very noticeable. This is because red is hard to bend because of the wavelength dependence of the refractive index, so it seems that red is easily leaked.
  • a black stripe 61 shown by hatching is formed on the transmission screen 58.
  • it is possible to suppress the occurrence of ghosts by taking such measures, the essence of sealing the ghosts There is a problem that it is not an effective countermeasure and that it takes time and effort to form a black stripe 61 on the screen 58. .
  • the light valve is illuminated with parallel light having a substantially constant incident angle at each part, so that brightness is less uneven. It is intended to provide an oblique projection display device.
  • An object of the present invention is to provide a projection display device having a lighting device capable of obtaining a stable image.
  • At least one or more of the reflective mirrors in the optical system may be partially or uniformly non-planar to provide an image on the screen.
  • Table that enables correction of distortion and correction of enlargement ratio The purpose is to provide a display device.
  • a diaphragm mechanism is provided in the projection optical system.
  • the central optical axis of the projection light projected by the projection means is inclined with respect to the screen.
  • the reflection mirror is constituted by a plurality of reflection mirrors, and at least one reflection mirror is made non-planar. You In addition, it has a large screen in which the light image incident at an angle from the rear side is focused on the front side by a small prism array.
  • the apex angle of each prism in the micro prism array is set to 40 degrees or more and 5 degrees or less, or the center of the projected light The angle of incidence is 60 with respect to the optical axis force screen. It is characterized by having a larger angle.
  • FIG. 1 is a layout diagram of an oblique projection optical system according to the present invention
  • FIG. 2 is a diagram illustrating a light valve in FIG. 1
  • FIG. 3 is a diagram in FIG. Fig. 4 is an explanatory diagram of the image formation on the screen in Fig. 1
  • Fig. 5 is a diagram showing one of the projection optical systems according to the present invention.
  • FIG. 6 shows an arrangement of an optical system in a projection example of a field base constituted by a lens
  • FIG. 6 shows a first projection optical system according to the present invention constituted by a positive lens and a ⁇ 3 ⁇ 4 lens.
  • FIG. 1 is a layout diagram of an oblique projection optical system according to the present invention
  • FIG. 2 is a diagram illustrating a light valve in FIG. 1
  • Fig. 5 is a diagram showing one of the projection optical
  • FIG. 19 is an explanatory diagram of the image formation of the screen in Fig. 16, Fig. 20 is an optical path diagram of an oblique projection optical system including an illumination system, and Fig. 21 is a conventional projection optical system.
  • FIG. 22 is a cross-sectional view of a projection optical system provided with a stop mechanism according to the present invention, and FIGS. 23 (A) to (C) are diagrams showing spot diagrams in the system.
  • FIG. 24 is an explanatory view showing an example of the shape of the squeezing mechanism.
  • FIG. 24 is a diagram of a spot diagram on a screen when the squeezing mechanism according to the present invention is used.
  • FIG. 25 is a cross-sectional view of the illumination optical device of the projection type display device of the present invention, FIG.
  • Fig. I shows an embodiment of the oblique projection optical system arrangement according to the present invention
  • Fig. 2 shows an image of a light valve
  • Fig. 3 shows an intermediate image with trapezoidal distortion
  • Figure 4 shows images on a screen without trapezoidal distortion.
  • the light emitted from the light source 1 reaches the light valve 2 almost parallel and illuminates it.
  • the light beam enters the light valve 2 at almost the same angle of incidence, and the entire surface of the light valve 2 has a uniform brightness and contrast.
  • the image of the light vanoleb 2 that can obtain the last is less trapezoidal due to the first lens 3 and the second lens 4 that are inclined to each other.
  • the intermediate image is formed on the intermediate image plane 5. As shown in FIG. 5, the plane parallel to the Z-axis, including the intersection of the image-side focal plane of the first lens 9 and the principal plane of the second lens 10, and the intermediate image Let g be the line of intersection with surface 11.
  • FIG. 3 This intersection g and the intersection g ′ of the plane parallel to the second projection optical system 6 through the object-side focal point of the second projection optical system 6 and the intermediate image plane 5 are shown in FIG.
  • the trapezoidally distorted middle image ABCD is obtained by the second projection optical system 6 as shown in FIG. 3, and the image ABCD without trapezoidal distortion is obtained as shown in FIG. As a result, it is imaged on screen 7.
  • the sheet that directs the incident light beam in a direction almost perpendicular to the front of the screen 7 using the total reflection of the prism It is desirable to use a screen whose light distribution characteristics have been improved for oblique projection in combination with a sheet of Chikiura lens.
  • FIG. 12 shows an embodiment of the configuration of the rear projection display device.
  • the light beam from the projection optical unit 39 having the above-described configuration is transmitted to the mirror 40 of FIG.
  • the thickness D of the cabinet 38 can be reduced. it can .
  • FIG. 5 The figure shows an example in which the second lens of the first projection optical system is set to a negative lens, and as a result, as shown in FIG. down's interval f 1 cos ⁇ -. ⁇ 2 / cos ⁇ 9 and have in the short rather, S ystem the co-down Bruno,. To cut And can be done.
  • the image-side ⁇ plane of the first lens 13 of the first projection optical system and the second lens 14 are similar to the embodiment of the first projection optical system shown in FIG. Assuming that the line of intersection between the plane parallel to the Z axis including the line of intersection of the main plane and the middle [j image plane 15 is g, there is no trapezoidal distortion as in the previous embodiment.
  • the image is formed on the screen 7 as an image.
  • Fig. 7 shows the first projection optical system consisting of two sets of two lenses that are not parallel to each other, so that each lens can be tilted. Therefore, good imaging can be easily obtained.
  • the first lens 17 and the second lens 18 of the projection optical system of the first lens are mutually inclined at an angle (5i, the image side of the first lens 17).
  • the intersection between the focal plane and the object-side focal plane of the second lens 18 is arranged so as to be substantially free from Z
  • the third projection lens 20 of the first projection optical system is arranged so that the intersection of the focal plane and the object-side focal plane of the second lens 18 is approximately Z.
  • the first intermediate image is formed by the third lens 2 ⁇ and the fourth lens 21 of the first projection optical system, and the second intermediate image! ⁇ As shown in Fig. 7, the first projection optical system The intersection of the image-side focal plane of the first lens 17 and the main plane of the second lens 18 is taken. A plane parallel to the Z-axis includes g of this, the intersection line between the main plane of the first projection optical system of ⁇ 3 Les emission's 2 Y you and g 9.
  • FIG. 8 shows another embodiment in which the first projection optical system is composed of two sets of two lenses that are not parallel to each other.
  • the lens interval can be set to f 1 / cos ⁇ ⁇ 1 f 2 / cos ⁇ as shown in the figure. And can be short, the system is connected. I can do it.
  • reference numeral 23 denotes a light valve
  • reference numeral 24 denotes a first lens of the projection system
  • reference numeral 26 denotes a first intermediate image plane
  • reference numeral 27 denotes a third lens
  • reference numeral 28 denotes a fourth lens.
  • Lens 29 indicates a second intermediate image plane.
  • FIG. 9 shows another embodiment in which the projection optical system of FIG. 9] is constituted by two sets of two lenses that are not parallel to each other.
  • a negative lens Ki f 4 / cos ⁇ A To make the fourth lens 35 of the first projection optical system a negative lens Ki f 4 / cos ⁇ A and came in short rather, out and child you the S ystem to the co-down path click door - good is, Les emissions's interval to jar good shown f 3 Z cos 0 3 .
  • ': 0 is the light valve
  • 31 is the first lens of the first projection system
  • 32 is the second lens
  • 33 is the first intermediate image plane
  • 3 4 indicates a third lens
  • 36 indicates a second medium image plane.
  • an intermediate image having trapezoidal distortion is created by the first projection optical means, and trapezoidal distortion is eliminated by the second projection optical means.
  • light modulation is achieved by using at least two lenses in which the first projection optical means are not parallel to each other.
  • the means can be illuminated with almost parallel light, which can reduce the brightness and contrast of the entire screen.
  • the projection optical system of 3 ⁇ 4j 1 is composed of two or more pairs of two lenses that are not parallel to each other, the inclination of each lens is small, that is, That is, it is possible to provide a projection display device having less aberration and excellent imaging performance.
  • the above problem is solved by disposing a stop mechanism in the oblique projection optical system.
  • the optical axis of the first lens 8 ⁇ of the first projection optical system, the optical axis of the second lens 81, the optical axis of the third lens 82, Optical axis of fourth lens 83, optical axis of aperture mechanism 84, optical axis of second projection optical system 85, normal of light valve 86, and screen 7 The normals are on the same plane.
  • the squeezing mechanism 84 shown in FIG. 23 (C) has a rhombus-shaped inner corner, and has an inner corner, which also has the same resolution as in the above embodiment. Is good, and a bright and less uneven image can be obtained.
  • the position of the above-described aperture mechanism is not limited to the example shown in FIG. 22 but may be located at the focal planes of two positive lenses that are not parallel to each other. If the intersection line intersects the Z axis, the same effect as that shown in the present embodiment can be obtained.
  • the central part is low as shown in Fig. 31 and the luminous flux distribution in the hollow state is illuminated with ii. Even in this case, it is possible to provide an illuminating device that can obtain a sufficiently parallel light beam.
  • FIG. 27 is a main sectional view showing the second embodiment.
  • a lamp 53, a reflector 54, and an optical element 70 are arranged. ing .
  • the optical element 70 in this embodiment has one surface having a convex surface of 7 ° b at the center, a periphery perpendicular to the optical axis, and another surface perpendicular to the optical axis.
  • the convexity 70b of the optical element 70b has a larger inclination toward the center ⁇
  • a light beam that has been emitted by a person with an angle component of ⁇ to several degrees near the center is refracted by the concave surface 7 ⁇ a of the optical element 7 ⁇ . Further, due to the concave surface 7 ⁇ a on the opposite side), the light beam of a certain angle component becomes parallel to the light beam.
  • the light beam incident on the optical element 70 is the peripheral portion. The light that has entered the optical system passes through the optical element 70 as it is. Therefore, the light flux passing through the optical element 7 ⁇ has a parallel component from the center to the periphery.
  • FIG. 29 is a main cross-sectional view showing the fourth protruding example.
  • a lamp 53, a reflector 54, and an optical element 70 are arranged.
  • One surface of the optical element 70 has a concave surface 70a at the center, and is perpendicular to the optical axis up to the same diameter as the diameter of the reflector 54, and furthermore.
  • the thickness of the peripheral portion 70c is gradually reduced.
  • the other surface is perpendicular to the optical axis.
  • the inclination of the concave surface 70a of the optical element 70 becomes larger toward the center.
  • an optical element having a reduced thickness in a limited area in the periphery was used, it could not be used until now.
  • the surrounding light can also be used. Therefore, if this illumination is concealed and an image formed by liquid crystal or the like is projected on a screen, it will be illuminated. It is possible to obtain a substantially uniform enlarged projection image.
  • the two conical optical elements 70 d and 7 shown in Fig. 32 have a luminous flux distribution whose center is dark as in the conventional example shown in Fig. 31. According to 0 e, the light flux distribution is as shown in FIG. 37.
  • FIGS. 38 (A) and 38 (B) are cross-sectional views of the reflection mirror according to the present invention.
  • FIG. 39 When the image shown in FIG. 39 is distorted, FIG. The distortion is corrected in the direction of each arrow.
  • the distortion of the image 56 on the screen 7 when the reflection mirror is a plane (see Fig. 39).
  • the part of the reflection mirror 40a which is the part that needs distortion correction, is shown in Fig. 38 (a ).
  • Fig. 38 (a ) By partially forming the convex curve ⁇ , as shown in FIG. 4, an image 5 6 ′ without distortion and forming an image on the screen 7 can be obtained. it can .
  • the part of the reflection mirror 40a which is the part requiring distortion correction, is partially removed, as shown in Fig. 38 b).
  • By forming a concave surface, as shown in FIG. 40 it is possible to form an image 56 'without distortion on the screen 7 as an image.
  • the portion where the two images 56 are to be enlarged is formed by making the reflecting mirror 40a a curved surface in the convex direction, and reducing the image 56.
  • the reflecting mirror 40a is formed into a concave curved surface.
  • the transmission-type screen 7 according to the present embodiment is a Since the apex angle is smaller than before, the amount of light leaking from the prism array 7a is reduced, and the loss of the incident light is reduced. Therefore, unlike the conventional case, the light leakage does not occur. It was confirmed by the following analysis that the transmission screen 7 according to the present example effectively suppressed the occurrence of light leakage and ghost by the transmission type screen 7. The results of this breaking will be described with reference to FIGS. 46 to 48.
  • the angle of the plunger is reduced, the apex is likely to be chipped, and the moldability during resin molding deteriorates. However, it is desirable that it be at least 40 °. Therefore, by forming the prism apex angle of the prism array 7a in a range of 4 ° to 50 °, the light leakage is reduced. This can be effectively prevented from occurring.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Projection Apparatus (AREA)

Abstract

Dispositif de visualisation du type par projection oblique. Le dispositif de visualisation comprend une source lumineuse, des éléments de modulation de la lumière, un dispositif de projection servant à projeter une image formée par les éléments de modulation de la lumière vers un écran, et un écran pour qu'il soit possible d'émettre des rayons de lumière pratiquement parallèles par rapport à une ampoule lumineuse et pour empêcher le manque d'uniformité de la luminosité d'une image, l'axe de la lumière projetée par le dispositif de projection faisant un angle oblique avec l'écran. Le dispositif de projection comprend un premier élément optique de projection destiné à transformer l'image formée par les éléments de modulation de la lumière en une image intermédiaire présentant une distorsion trapézoïdale, et un second élément optique de projection destiné à transformer l'image intermédiaire présentant la distorsion trapézoïdale en une image dépourvue de distorsion trapézoïdale sur l'écran. Le premier élément optique de projection est pourvu de deux lentilles qui ne sont pas parallèles l'une à l'autre, et les structures de la source lumineuse, le miroir réflecteur de conversion de la trajectoire optique et l'écran sont améliorés.
PCT/JP1992/000307 1991-03-15 1992-03-13 Dispositif de visualisation du type par projection WO1992016871A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US07/949,243 US5422691A (en) 1991-03-15 1991-03-13 Projection type displaying apparatus and illumination system
JP50641892A JP3218604B2 (ja) 1991-03-15 1992-03-13 投射型表示装置

Applications Claiming Priority (14)

Application Number Priority Date Filing Date Title
JP3/51251 1991-03-15
JP5125191 1991-03-15
JP16964691 1991-07-10
JP3/169646 1991-07-10
JP18464991 1991-07-24
JP3/184649 1991-07-24
JP23339591 1991-09-12
JP3/233395 1991-09-12
JP23633691 1991-09-17
JP3/236336 1991-09-17
JP3/281500 1991-10-28
JP28150091 1991-10-28
JP3523192 1992-02-21
JP4/35231 1992-02-21

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WO (1) WO1992016871A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0676893A2 (fr) * 1994-04-07 1995-10-11 Projectavision, Inc. Boîtier pour un projecteur de télévision à rétroprojection portable
WO1996013943A1 (fr) * 1994-11-01 1996-05-09 Raychem Corporation Elimination du trou dans la lumiere emise par une lampe a reflecteur
WO1996016351A1 (fr) * 1994-11-23 1996-05-30 Minnesota Mining And Manufacturing Company Projecteur a source de lumiere equipee de plusieurs lampes
GB2298497A (en) * 1995-03-02 1996-09-04 Robin Christopher Colclough Asymmetric divergent projection system
US5659409A (en) * 1992-10-09 1997-08-19 Ag Technology Co., Ltd. Light source apparatus using a cone-like material and an applied apparatus thereof
EP0864919A2 (fr) * 1997-02-18 1998-09-16 Victor Company Of Japan, Ltd. Appareil, procédé et plaque d'enregistrement d'images stéréoscopiques
JP2007079054A (ja) * 2005-09-13 2007-03-29 Canon Inc 光学系および画像投射装置
JP2009259582A (ja) * 2008-04-16 2009-11-05 Casio Comput Co Ltd 光源装置及びこの光源装置を備えたプロジェクタ

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007501446A (ja) * 2003-05-13 2007-01-25 スクラム テクノロジーズ インコーポレイテッド ディスプレイパネル用精密光学系

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51334A (fr) * 1974-05-21 1976-01-06 Furitsutsu Bikutaa Haseruburat
JPS53147835U (fr) * 1977-04-26 1978-11-21
JPS63120242U (fr) * 1987-01-27 1988-08-03
JPH02236587A (ja) * 1990-02-15 1990-09-19 Casio Comput Co Ltd オーバヘッドプロジェクタ

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51334A (fr) * 1974-05-21 1976-01-06 Furitsutsu Bikutaa Haseruburat
JPS53147835U (fr) * 1977-04-26 1978-11-21
JPS63120242U (fr) * 1987-01-27 1988-08-03
JPH02236587A (ja) * 1990-02-15 1990-09-19 Casio Comput Co Ltd オーバヘッドプロジェクタ

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5659409A (en) * 1992-10-09 1997-08-19 Ag Technology Co., Ltd. Light source apparatus using a cone-like material and an applied apparatus thereof
EP0676893A2 (fr) * 1994-04-07 1995-10-11 Projectavision, Inc. Boîtier pour un projecteur de télévision à rétroprojection portable
EP0676893A3 (fr) * 1994-04-07 1995-12-20 Projectavision Inc Boîtier pour un projecteur de télévision à rétroprojection portable.
WO1996013943A1 (fr) * 1994-11-01 1996-05-09 Raychem Corporation Elimination du trou dans la lumiere emise par une lampe a reflecteur
WO1996016351A1 (fr) * 1994-11-23 1996-05-30 Minnesota Mining And Manufacturing Company Projecteur a source de lumiere equipee de plusieurs lampes
GB2298497A (en) * 1995-03-02 1996-09-04 Robin Christopher Colclough Asymmetric divergent projection system
GB2298497B (en) * 1995-03-02 1997-05-21 Robin Christopher Colclough Image display device
EP0864919A2 (fr) * 1997-02-18 1998-09-16 Victor Company Of Japan, Ltd. Appareil, procédé et plaque d'enregistrement d'images stéréoscopiques
EP0864919A3 (fr) * 1997-02-18 1999-05-26 Victor Company Of Japan, Ltd. Appareil, procédé et plaque d'enregistrement d'images stéréoscopiques
JP2007079054A (ja) * 2005-09-13 2007-03-29 Canon Inc 光学系および画像投射装置
JP2009259582A (ja) * 2008-04-16 2009-11-05 Casio Comput Co Ltd 光源装置及びこの光源装置を備えたプロジェクタ

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