JP4869173B2 - Projection display device - Google Patents

Projection display device Download PDF

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Publication number
JP4869173B2
JP4869173B2 JP2007198189A JP2007198189A JP4869173B2 JP 4869173 B2 JP4869173 B2 JP 4869173B2 JP 2007198189 A JP2007198189 A JP 2007198189A JP 2007198189 A JP2007198189 A JP 2007198189A JP 4869173 B2 JP4869173 B2 JP 4869173B2
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polarizing plate
plate holder
outer frame
holder
pair
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JP2007198189A
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JP2009031698A (en
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和哉 南
正昭 宮本
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三洋電機株式会社
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Description

  The present invention relates to a projection display apparatus, and more particularly to a projection display apparatus that suppresses image distortion.

  2. Description of the Related Art Projection type video apparatuses that project images on a large screen or the like, that is, projectors have been used for some time. In particular, in recent years, liquid crystal projectors that can be made smaller and lighter than the CRT method have become mainstream.

  The liquid crystal projector projects light onto the liquid crystal panel from the back, and the liquid crystal panel selectively transmits the light, thereby forming an image, and projecting the transmitted light onto the screen displays the image on the screen. Here, the liquid crystal panel has a structure in which a liquid crystal cell having liquid crystal molecules is sandwiched between optical films such as polarizing plates from before and after. Therefore, the light from the light source is polarized to a specific linearly polarized light by the polarizing plate on the incident side and reaches the liquid crystal cell. Since the alignment direction of the liquid crystal molecules in the liquid crystal cell changes depending on the voltage applied corresponding to the image to be projected, the polarized light that has reached the liquid crystal cell further moves in the alignment direction of the liquid crystal molecules when passing through the liquid crystal cell. Correspondingly, the polarization direction can be changed. Then, polarized light necessary for displaying an image is selectively transmitted by the polarizing plate on the output side, and the light is projected onto the screen to project the image. For the purpose of improving the polarization characteristics, an optical film such as an optical compensator is usually provided between the polarizing plate on the incident side and the projection side and the liquid crystal cell according to the type of the liquid crystal cell.

By the way, in a liquid crystal display, it is customary to form the liquid crystal panel by attaching the optical compensation plate or the polarizing plate to the liquid crystal cell. However, in the liquid crystal projector, the optical compensation plate or the polarizing plate is separate from the liquid crystal cell. It is normal to do. This is because the liquid crystal projector uses a very strong light source such as a high-pressure mercury lamp, while the optical compensator and the polarizing plate are usually made of resin and cannot withstand long-term use. Therefore, a technique is known in which an optical compensator or a polarizing plate having a short lifetime can be replaced (for example, Patent Document 1).
JP 2006-330476 A

  By the way, in the technique shown by patent document 1, it adheres and fixes to the pedestal part of a polarizing plate holder with an adhesive agent in the state which butted the polarizing plate to the head of the polarizing plate holder. Therefore, since the polarizing plate is bonded and fixed on both outer sides thereof, distortion is likely to occur due to shrinkage during drying of the adhesive. Further, since the polarizing plate holder is further screwed through the plate spring member, the stress of the plate spring is applied to the polarizing plate through the polarizing plate holder, and further distortion may occur. When the polarizing plate is distorted, the projected image is also distorted.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a projection display apparatus that suppresses image distortion caused by distortion in a polarizing plate.

A projection display apparatus according to the present invention includes a polarizing plate that polarizes light emitted from a light source,
A polarizing plate holder having an outer frame surrounding an outer periphery of the polarizing plate and a supporting claw that protrudes from the outer frame toward the inner periphery and supports the polarizing plate with play, and fixing the polarizing plate holder A polarizing plate holder fixing portion having an upper opening, and a pair of polarizing plate grooves formed on the polarizing plate holder fixing portion, in which left and right pieces, which are peripheral portions of the outer frame of the polarizing plate holder, are slidably inserted from above The bottom surfaces of the pair of polarizing plate groove members are formed in a planar shape, and the left and right sides that are the peripheral portions of the outer frame of the polarizing plate holder inserted into the pair of polarizing plate groove members The piece is partially protruded in a direction perpendicular to the plane direction of the polarizing plate, and an elastic protrusion is formed. The polarizing plate holder inserted into the pair of polarizing plate groove members from above is a polarizing plate holder. The upper part of the outer frame of the Characterized in that it is fixed by being resiliently gripped me.

  The projection display apparatus according to the present invention includes an optical compensator that changes the phase of polarized light generated by the polarizing plate, an outer frame that surrounds the outer periphery of the optical compensator, and an outer frame that protrudes toward the inner periphery. And an optical compensation plate holder having a support claw for supporting the optical compensation plate with play, and formed adjacent to the pair of polarizing plate groove members, and an outer frame of the optical compensation plate holder. A pair of optical compensator groove members that are slidably inserted from above into the left and right pieces as peripheral portions, and the bottom surfaces of the optical compensator groove members are formed in a planar shape, and a pair of optical compensators The left and right pieces, which are the peripheral part of the outer frame of the optical compensation plate holder inserted into the plate groove member, partially protrude in a direction perpendicular to the surface direction of the optical compensation plate and have elastic projections. A pair of grooves for the optical compensator formed Inserted optical compensator holder from above, the top of the outer frame of the optical compensation plate holder, characterized in that it is resiliently gripped by the gripping member.

  According to the present invention, distortion generated in a replaceable polarizing plate can be suppressed, so that it is possible to supply a projection display apparatus that suppresses distortion from occurring in a projected image.

  An embodiment of a projection display apparatus embodying the present invention will be described below with reference to FIGS.

  As shown in FIG. 1, a projection display apparatus (hereinafter referred to as a projector) according to this embodiment includes a light source 1, a condenser lens 2, mirrors 3 to 8, a polarizing plate 9, an optical compensation plate 10, and a liquid crystal. A cell 11, a prism 13, and a projection lens 14 are provided. That is, in this projector, the polarizing plate 9, the optical compensation plate 10 and the liquid crystal cell 11 constitute a liquid crystal panel 12. The projector is a 3LCD type projector that has three liquid crystal cells, transmits red, green, and blue (the three primary colors of light) to the liquid crystal panel, and performs full-color composition using a prism. In addition, the symbols R, G, and B are added to the reference numerals of the polarizing plate 9, the optical compensation plate 10, the liquid crystal cell 11, and the liquid crystal panel 12 that are used for red, green, and blue light, respectively, when particularly necessary thereafter. For example, the polarizing plate 9R and the liquid crystal panel 12B are described.

  The light source 1 of the projector is configured using a mercury lamp that can irradiate intense light. Since the light emitted from the light source 1 is refracted by the condenser lens 2, it becomes a substantially parallel light beam. The traveling direction of the parallel rays is changed by the mirror 3 and is directed to the mirror 4. Since the mirror 4 is a dichroic mirror that transmits light of a specific wavelength and reflects light of other wavelengths, the mirror 4 transmits red light R and reflects light of other wavelengths. The red light R that has passed through the mirror 4 travels toward the mirror 5 and is reflected by the mirror 5 toward the liquid crystal panel 12R. On the other hand, light having a wavelength other than red light R reflected by the mirror 4 travels to the mirror 6. Since the mirror 6 is a dichroic mirror that reflects green light and transmits blue light, the green light G reflected by the mirror 6 goes to the liquid crystal panel 12G and to the blue light B mirror 7 that has passed through the mirror 6. The blue light B reflected by the mirror 7 is directed to the mirror 8 and further reflected by the mirror 8 to the liquid crystal panel 12B.

  The red, green, and blue light traveling toward the liquid crystal panel 12 is first polarized into specific linearly polarized light by the polarizing plate 9 on the input side. Further, after the phase characteristics are adjusted by the optical compensator 10 on the input side, the light passes through the liquid crystal cell 11. At this time, the liquid crystal cell 11 polarizes the transmitted light according to the voltage applied corresponding to the image to be projected. The polarized light polarized in the liquid crystal cell 11 is selectively transmitted by the output-side polarizing plate 9 after the phase characteristics are adjusted by the output-side optical compensation plate 10. Thus, the light accompanying the image transmitted through the liquid crystal panel 12 is directed to the prism 13. Since each light is refracted by the prism 13 and directed to the projection lens 14, the red, green, and blue lights are again synthesized in full color. The synthesized light is projected onto a screen (not shown) through a projection lens, so that a color image is displayed on the screen.

  FIG. 2 is a perspective view showing a positional relationship among a polarizing plate, an optical compensator and a fixing member on the incident side of the projection display apparatus according to the embodiment, and FIG. 3 is a view seen from the projection lens 14 side of the same part. is there. As seen from FIG. 3, the left red light polarizing plate 9R and the optical compensation plate 10R, the green light polarizing plate 9G and the optical compensation plate 10G in the center, and the blue light polarizing plate 9B and the optical compensation plate 10B in the right part. I have. Although the prism 13 exists in the part surrounded by the left part, the center part, and the right part, it is removed and shown for convenience of explanation. In the following description, the terms “up”, “down”, “left”, and “right” are used in the direction shown in FIG. In the following, the structure of the central part will be mainly described, and the same applies to the left part and the right part, and the description thereof will be omitted.

  On the left and right sides of the central portion, there are provided a pair of groove members 52 into which the left and right sides, which are the peripheral portions of the outer frame of the polarizing plate holder 20 that supports the polarizing plate 9, can be slidably inserted. By inserting the polarizing plate holder 20 from above the pair of groove members 52, the movement of the polarizing plate holder 20 in the left-right direction is restricted. The position of the lower side of the outer frame of the polarizing plate holder 20 is fixed by contacting the bottom plate 55. Similarly, the left and right sides that are the peripheral part of the outer frame of the optical compensator holder 30 that supports the optical compensator 10 are slid on the left and right sides of the central portion and in front of the pair of groove members 52, that is, on the prism side. A pair of groove members 53 are provided that can be inserted into the formula. By inserting the optical compensation plate holder 30 from above the pair of groove members 53, the movement of the optical compensation plate holder 30 in the left-right direction is restricted. The position of the lower side of the outer frame of the optical compensation plate holder 30 is fixed by contacting the bottom plate 55. The bottom plate 55 is provided at the lower ends of the pair of groove members 52 and the pair of groove members 53, and the position of the lower side of the outer frame of the polarizing plate holder 20 and the position of the lower side of the outer frame of the optical compensation plate holder 30 are set. It functions as a support member that regulates and supports.

  Further, the gripping member 40 is attached so as to connect the upper ends of the pair of groove members 52 and the pair of groove members 53. The polarizing plate holder 20 and the optical compensation plate holder 30 are elastically gripped by the gripping member 40 on one side of the upper part of the outer frame. Therefore, the pair of groove members 52, the bottom plate 55, and the gripping member 40 form a polarizing plate holder fixing portion that elastically fixes the polarizing plate holder. Similarly, an optical compensation plate holder fixing portion for elastically fixing the optical compensation plate holder is formed by the pair of groove members 53, the bottom plate 55, and the gripping member 40 described above.

  As shown in FIGS. 4A and 4B, the gripping member 40 has a shape extending in the left-right direction that can substantially cover the vicinity of the upper side of the outer frame of the polarizing plate holder 20 and the optical compensation plate holder 30. A screw hole 43 for screwing the gripping member 40 is provided at the left end, and an insertion claw 44 for inserting into the corresponding hole protrudes to the right at the right end. Further, a handle 46 for temporarily holding the gripping member 40 when the gripping member 40 is attached or detached is provided immediately above the right side of the screw hole 43. A pair of nail claws 41 having a leaf spring structure for elastically fixing the polarizing plate holder 20 and the optical compensation plate holder 30 from the direction of the irradiation light is provided below the handle 46, and the right side of the nail Are provided with two pairs of holding claws 42 having a leaf spring structure for elastically fixing the polarizing plate holder 20 and the optical compensation plate holder 30 from above.

  When attaching the gripping member 40, as shown in FIG. 5A, the gripping member 40 is first held using the handle 46, and provided near the right side of the upper ends of the pair of groove members 52 and the pair of groove members 53. The insertion claw 44 is inserted into the inserted insertion hole. Next, as shown in FIG. 5 (b), the gripping member 40 is covered so as to cover the upper part of the polarizing plate holder 20 and the optical compensation plate holder 30 with the inserted insertion claw 44 as a fulcrum, and the screw hole 43 is screwed. Stop through.

  As shown in FIG. 6, when the gripping member 40 is attached, the pair of clamping claws 41 abut on the upper left side of the polarizing plate holder 20 and the optical compensation plate holder 30 so as to be sandwiched from the light irradiation direction. By the elastic force of the claw 41, both are urged in a direction to bring them closer together. Between the polarizing plate holder 20 and the optical compensation plate holder 30, there is a protruding portion 54 that partitions between the pair of groove members 52 and the pair of groove members 53, so that the polarizing plate holder 20 and the optical compensation plate holder 30 protrude. It is pressed against the part 54. That is, the movement of the polarizing plate holder 20 and the optical compensation plate holder 30 in the direction orthogonal to the in-plane direction is restricted by the elastic force of the nail 41.

  On the other hand, when the gripping member 40 is attached, two pairs of pressing claws 42 come into contact with the left and right of the upper end portions of the polarizing plate holder 20 and the optical compensation plate holder 30 from above, and the elasticity of the two pairs of pressing claws 42 Both are biased downward. Since the polarizing plate holder 20 and the optical compensator plate holder 30 are already restricted from moving downward by the bottom plate 55, the upward movement of the polarizing plate holder 20 and the optical compensator plate holder 30 is caused by the elastic force of the pressing claw 42. Be regulated.

  That is, by attaching the gripping member 40, the polarizing plate holder fixing portion having the pair of groove members 52, the bottom plate 55 (supporting member), and the gripping member 40, the direction orthogonal to the horizontal, vertical, and in-plane directions of the polarizing plate holder 20. The movement in all directions is restricted, and the polarizing plate holder 20 is elastically fixed. Further, the optical compensation plate holder fixing portion having the pair of groove members 53, the bottom plate 55 (support member), and the gripping member 40 is used for the optical compensation plate holder 30 in the left / right / up / down / light irradiation direction (direction orthogonal to the surface direction). Movement in all directions is restricted, and the optical compensator holder 30 is elastically fixed.

  As shown in FIG. 7, the polarizing plate holder 20 includes an outer frame 21 and support claws 23 that protrude from the outer frame 21 toward the inner periphery. The inner periphery of the outer frame 21 is made larger than the outer periphery of the polarizing plate 9. The support claws 23 protrude from the front surface and the back surface of the outer frame, respectively, and the polarizing plate 9 is loosely fitted to the outer frame 21 and is supported by the support claws 23 protruding from the front surface and the support claws 23 protruding from the back surface. The holder 20 is supported within the inner periphery of the outer frame.

  As described above, since the inner periphery of the outer frame 21 is made larger than the outer periphery of the polarizing plate 9, it is supported with play in the vertical direction and the horizontal direction. The distance in the direction perpendicular to the plane of the polarizing plate 9 between the surface of the support claw 23 protruding from the front surface facing the polarizing plate 9 and the surface of the support claw 23 protruding from the back surface facing the polarizing plate 9 is also the polarizing plate 9. Therefore, the polarizing plate 9 is supported with play in the thickness direction. Accordingly, the polarizing plate 9 is supported by the polarizing plate holder 20 so that it does not receive any special stress from the outer frame 21 or the support claw 23, and does not cause distortion or deformation.

  Further, since the polarizing plate 9 is fixed to the fixing member via the polarizing plate holder 20 as described above, the polarizing plate 9 does not receive a direct force from the fixing member. The polarizing plate holder 20 is elastically fixed to the fixing member. The stress accompanying this elastic fixation is applied to the polarizing plate holder 20. Although the polarizing plate holder 20 can be deformed by such stress, the deformation is absorbed by the play and does not reach the polarizing plate 9. Note that the size of the play of the polarizing plate holder 20 is determined appropriately. That is, within a predetermined dimension determined within a range in which the polarizing plate 9 is not dropped from the polarizing plate holder 20 or the image projected by the projection display apparatus due to the movement of the polarizing plate 9 in the polarizing plate holder 20 is not distorted. The size is determined so as to absorb the deformation of the polarizing plate holder 20. The magnitude of such play is affected by the force that can be applied to the polarizing plate holder 20 and the strength of the polarizing plate holder 20.

  On one surface of the outer frame 21 of the polarizing plate holder 20, protrusions 24 and 25 that partially protrude in a direction orthogonal to the in-plane direction of the polarizing plate 9 are provided. As shown in FIG. 6, in the presentation of 20 polarizing plate holders, the protrusions 24 and 25 are in contact with or close to the groove wall of the groove member 52, and the polarizing plate holder 20 moves in a direction perpendicular to the plane of the polarizing plate 9. Partly regulate this. The polarizing plate holder 20 is restricted from moving in the direction orthogonal to the surface of the polarizing plate 9 by the nail 41 of the gripping member 40 at the upper part, and the projections 24 and 25 perform the same restriction at the lower part, It can be further restricted that the plate holder 20 moves in a direction perpendicular to the plane of the polarizing plate 9.

  The optical compensator holder 30 has the same structure and effect as the polarizing plate holder 20, and therefore description thereof is omitted.

  According to the above embodiment, the following effects can be obtained.

  (1) According to the above embodiment, the polarizing plate holder 20 supports the polarizing plate 9 with a play that allows the polarizing plate 9 to move within a predetermined dimension in the same plane and in a direction perpendicular to the plane. If so, the deformation or distortion generated in the polarizing plate holder does not affect the polarizing plate 9. In addition, since the polarizing plate 9 is fixed via the polarizing plate holder 20, stress for fixing the polarizing plate 9 does not directly apply to the polarizing plate 9. Further, even when the stress accompanying fixation is applied to the polarizing plate holder 20, the polarizing plate 9 will not be deformed or distorted as long as the deformation of the polarizing plate holder 20 is within a range that can be absorbed by play. Therefore, distortion of the projected image due to distortion of the polarizing plate 9 is suppressed.

  (2) Since the polarizing plate holder 20 is detachably fixed to the polarizing plate holder fixing portion using the detachable gripping member 40, the polarizing plate 9 can be exchanged via the polarizing plate holder 20.

  (3) The polarizing plate holder is formed at a low cost because it is formed with a simple structure including an outer frame surrounding the outer periphery of the polarizing plate with play and a support claw protruding from the outer frame toward the inner periphery. it can.

  (4) According to the above embodiment, since the polarizing plate holder fixing portion for elastically fixing the polarizing plate holder is provided, the elastic force is applied to the polarizing plate holder and is not applied to the polarizing plate. Accordingly, as described above, if the deformation of the polarizing plate holder due to the elastic force is within the range of play of the polarizing plate holder, the polarizing plate is not deformed or distorted.

  (5) According to the above-described embodiment, one surface of the outer frame 21 of the polarizing plate holder 20 has a protrusion partially protruding in a direction orthogonal to the in-plane direction of the polarizing plate 9, and the protrusion allows the polarizing plate In order to partially restrict the movement in the direction orthogonal to the surface of the holder, the polarizing plate holder is prevented from moving in the direction orthogonal to the surface of the polarizing plate holder.

  (6) According to the above embodiment, the optical compensation plate holder has the same structure as the polarizing plate holder, and the optical compensation plate holder fixing portion has the same structure as the polarizing plate holder fixing portion. Similarly to the above, distortion and deformation are suppressed. Therefore, distortion of the projected image due to deformation of the optical compensation plate is also suppressed. The optical compensator can also be replaced.

  In addition, you may change this embodiment as follows.

  In the above embodiment, the present invention is applied to a projection display apparatus including a polarizing plate and an optical compensation plate. However, depending on the type of the liquid crystal cell 11, the optical compensation plate is not essential. If the optical compensator can be omitted, the cost can be reduced.

  In the above embodiment, the projection display apparatus including the polarizing plate and the optical compensation plate is applied. However, a plate having another optical function may be used instead of the optical compensation plate or in combination with the optical compensation plate. .

  In the above embodiment, both the polarizing plate and the optical compensator are fixed by the same method, but only one of them may be fixed by the above method, and the other may be fixed by a conventional method. This is effective when either one of the strains or deformations is not particularly problematic.

  In the above embodiment, the present invention is applied to a projection display apparatus using three liquid crystal panels called a so-called 3LCD system. However, the present invention may be applied to other types of projection display apparatuses. . The present invention is applicable to any projection type image display apparatus using at least a polarizing plate.

  The projection display apparatus according to the present invention can suppress distortion due to force applied to the polarizing plate, thereby suppressing distortion of the projected image. Therefore, the projection display apparatus can be used in a wide range of projection display apparatuses using polarizing plates. is there.

It is a schematic diagram of the optical system of the projection type video display apparatus concerning embodiment. FIG. 3 is a perspective view of the vicinity of an optical compensation plate, a polarizing plate, and a support member on the incident side of the projection display apparatus according to the embodiment. It is the figure which looked at the optical compensator on the incident side, polarizing plate, and supporting member periphery of the projection type video display apparatus concerning embodiment from the projection lens side. It is a figure explaining the structure of the holding member used for the projection type video display apparatus concerning embodiment, (a) is a front view, a top view, a left-right side view, and a bottom view, (b) is a perspective view. . It is a figure explaining the attachment method of the holding member used for the projection type video display apparatus concerning embodiment, (a) is a perspective view in the middle of attachment, (b) is a perspective view at the time of completion | finish of attachment. It is a partial cross section figure of the optical compensator and polarizing plate of the incident side of the projection type video display apparatus concerning embodiment, and a support member periphery. It is a figure explaining the structure of the polarizing plate holder used for the projection type video display apparatus concerning embodiment, (a) is a 6-plane figure, (b) is a perspective view.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Light source, 2 ... Condensing lens, 3 ... Mirror, 4 ... Mirror (dichroic mirror), 5 ... Mirror, 6 ... Mirror (dichroic mirror), 7, 8, ..Mirror, 9, 9B, 9G, 9R ... Polarizing plate, 10, 10B, 10G, 10R ... Optical compensator, 11 ... Liquid crystal cell, 12, 12B, 12G, 12R ... Liquid crystal panel , 13 ... prism, 14 ... projection lens, 20 ... polarizing plate holder, 21 ... outer frame, 23 ... support claw, 24 ... projection, 30 ... optical compensator holder , 40 ... gripping member, 41 ... clamping claw, 42 ... pressing claw, 43 ... screw hole, 44 ... insertion claw, 46 ... handle, 52, 53 ... groove member, 54 ... projecting portion, 55 ... bottom plate (support member), B ... blue light, G ... green light, ... red light.

Claims (2)

  1. A polarizing plate for polarizing light emitted from a light source;
    A polarizing plate holder having an outer frame surrounding the outer periphery of the polarizing plate and a support claw that protrudes from the outer frame toward the inner periphery and supports the polarizing plate with play.
    A polarizing plate holder fixing portion having an upper opening for fixing the polarizing plate holder;
    A pair of groove members for a polarizing plate that is formed in the polarizing plate holder fixing portion, and left and right pieces that are peripheral portions of the outer frame of the polarizing plate holder are slidably inserted from above;
    The bottom surfaces of the pair of polarizing plate groove members are formed in a planar shape, and the left and right pieces, which are peripheral portions of the outer frame of the polarizing plate holder inserted into the pair of polarizing plate groove members, The polarizing plate holder that partially protrudes in a direction perpendicular to the surface direction of the plate and has elastic protrusions and is inserted into the pair of polarizing plate groove members from above is the upper part of the outer frame of the polarizing plate holder Is fixed by being elastically gripped by a gripping member.
  2. An optical compensator for changing the phase of polarized light generated by the polarizing plate;
    An optical compensator holder having an outer frame surrounding the outer periphery of the optical compensator and a support claw that protrudes from the outer frame toward the inner periphery and supports the optical compensator with play;
    A pair of groove members for an optical compensator plate formed adjacent to the pair of polarizing plate groove members and into which left and right pieces, which are peripheral portions of the outer frame of the optical compensator plate holder, are slidably inserted from above Prepared,
    The bottom surface of the optical compensation groove member is formed in a planar shape, and the left and right pieces, which are the peripheral portions of the outer frame of the optical compensation plate holder inserted into the pair of optical compensation plate groove members, are optically The optical compensation plate holder that partially protrudes in a direction orthogonal to the surface direction of the compensation plate and has an elastic projection and is inserted into the pair of groove members for the optical compensation plate from above is optically supported by the gripping member. The projection display apparatus according to claim 1, wherein an upper portion of the outer frame of the compensation plate holder is elastically gripped.
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JP2011107210A (en) * 2009-11-12 2011-06-02 Sanyo Electric Co Ltd Projection type video display device
JP5693263B2 (en) * 2011-01-28 2015-04-01 キヤノン株式会社 Image projection device
CN103415803B (en) * 2011-03-11 2016-08-10 西铁城控股株式会社 Optical modulation element and possess the microscopie unit of optical modulation element
JP2015135372A (en) * 2014-01-16 2015-07-27 光ガラス株式会社 Optical filter and imaging lens
CN104298056B (en) * 2014-10-15 2016-04-13 深圳雅图数字视频技术有限公司 Polarizer assembly and the projector containing this Polarizer assembly

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JP2550880B2 (en) * 1993-08-24 1996-11-06 日本電気株式会社 Filter holding mechanism
JP3454719B2 (en) * 1998-07-23 2003-10-06 三洋電機株式会社 Projection device with polarizing plate
JP3702890B2 (en) * 2003-10-06 2005-10-05 セイコーエプソン株式会社 Optical assembly and projector
JP2005173264A (en) * 2003-12-11 2005-06-30 Canon Inc Optical element holding device and projection type image display device
JP4182890B2 (en) * 2004-01-22 2008-11-19 セイコーエプソン株式会社 Optical device and projector
JP2006330476A (en) * 2005-05-27 2006-12-07 Sony Corp Optical unit for projection type display apparatus

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