JP4869173B2 - Projection display device - Google Patents

Projection display device Download PDF

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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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JP2009031698A (en
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正昭 宮本
和哉 南
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Sanyo Electric Co Ltd
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Description

本発明は、投写型映像表示装置に係り、詳しくは映像のひずみを抑制する投写型映像表示装置に関する。   The present invention relates to a projection display apparatus, and more particularly to a projection display apparatus that suppresses image distortion.

大型のスクリーン等に映像を投影して表示する投射型映像装置すなわちプロジェクタが以前より用いられている。特に近年、ＣＲＴ方式に比べ小型かつ軽量に構成できる液晶プロジェクタが主流となっている。   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.

液晶プロジェクタは背面から液晶パネルに光を投射し、液晶パネルがかかる光を選択的に透過することにより、映像を構成し、透過光をスクリーンに投影することによりスクリーン上に映像を映写する。ここで液晶パネルは液晶分子を有する液晶セルをその前後より偏光板などの光学フィルムで挟み込んだ構造である。そのため光源からの光は入射側の偏光板により特定の直線偏光に偏光させられ、液晶セルに到達する。映写すべき映像に対応して印加された電圧により、液晶セル内の液晶分子の配向方向が変化するため、液晶セルに到達した偏光は、液晶セルを透過する際に更に液晶分子の配向方向に対応して偏光方向を変えられる。そして、映像を表示するのに必要な偏光が、出力側の偏光板により選択的に透過させられるとともにかかる光がスクリーンに投射され、映像が映写される。なお、偏光特性改善等を目的として、液晶セルの種類に応じて光学補償板などの光学フィルムが入射側および投射側の偏光板と液晶セルの間に設けられるのが通常である。   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.

ところで、液晶ディスプレイにおいては液晶セルに上記光学補償板や偏光板を貼り付けて液晶パネルを形成するのが通例であるが、液晶プロジェクタにおいては光学補償板や偏光板と液晶セルとは別体とすることが普通である。液晶プロジェクタは高圧水銀灯などの非常に強い光源を使用する一方、光学補償板や偏光板は通常樹脂で形成されるため、長期間の使用に耐えられないためである。そこで、寿命の短い光学補償板や偏光板を交換できる構造とする技術が知られている（例えば特許文献１）。
特開２００６−３３０４７６号公報 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

ところで、特許文献１に示された技術においては、偏光板を偏光板ホルダーの頭部に突き当てた状態で接着剤によって偏光板ホルダーの脚柱部に接着固定する。したがって、偏光板はその両外側において接着固定されるため、接着剤の乾燥時の収縮により歪が生じやすい。また、偏光板ホルダーは更に板バネ部材を介して螺子止めされるため、板バネの応力が偏光板ホルダーを介して偏光板に加わり、更に歪が生じうる。偏光板に歪が生じると投写される映像にも歪が生じるため問題となる。   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.

本発明はかかる実情に鑑みて成されたもので、偏光板に歪が生じることを原因とする映像の歪を抑制した投写型映像表示装置を供給することを目的とする。   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.

本発明にかかる投写型映像表示装置は、光源より照射された光を偏光させる偏光板と、
前記偏光板の外周を取り巻く外枠と外枠から内周に向かって突出すると共に、前記偏
光板を遊びを有して支持する支持爪とを有する偏光板ホルダーと、前記偏光板ホルダーを固定する上方開口の偏光板ホルダー固定部と、前記偏光板ホルダー固定部に形成され、前記偏光板ホルダーの外枠の周辺部である左右の片が上方からスライド式に挿入される一対の偏光板用溝部材とを備え、前記一対の偏光板用溝部材の底面は平面状に形成されていると共に、一対の偏光板用溝部材に挿入される前記偏光板ホルダーの外枠の周辺部である左右の片には、偏光板の面方向と直交する方向に部分的に突出すると共に、弾性を有する突起が形成され、一対の偏光板用溝部材に上方から挿入された偏光板ホルダーは、偏光板ホルダーの外枠の上部が把持部材によって弾性的に把持されることにより固定されることを特徴とする。 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.

また、本発明にかかる投写型映像表示装置は、前記偏光板により生じた偏光の位相を変化させる光学補償板と、前記光学補償板の外周を取り巻く外枠と外枠から内周に向かって突出すると共に、前記光学補償板を遊びを有して支持する支持爪とを有する光学補償板ホルダーと、前記一対の偏光板用溝部材に隣接して形成され、前記光学補償板ホルダーの外枠の周辺部である左右の片が上方からスライド式に挿入される一対の光学補償板用溝部材とを備え、前記光学補償用溝部材の底面は平面状に形成されていると共に、一対の光学補償板用溝部材に挿入される前記光学補償板ホルダーの外枠の周辺部である左右の片には、光学補償板の面方向と直交する方向に部分的に突出すると共に、弾性を有する突起が形成され、一対の光学補償板用溝部材に上方から挿入された光学補償板ホルダーは、前記把持部材によって光学補償板ホルダーの外枠の上部が弾性的に把持されることを特徴とする。   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.

本発明によれば、取替え可能な偏光板に生じる歪を抑制することができるため、投射される映像に歪が生じることを抑制した投写型映像表示装置を供給することができる。   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.

以下、本発明を具体化した投写型映像表示装置の一実施形態を図１〜図７にしたがって説明する。   An embodiment of a projection display apparatus embodying the present invention will be described below with reference to FIGS.

図１に示すように、本実施形態にかかる投写型映像表示装置（以下プロジェクタとする）は光源１と、集光レンズ２とミラー３〜８と、偏光板９と、光学補償板１０と液晶セル１１とプリズム１３と投射レンズ１４を備えている。すなわちこのプロジェクタにおいて偏光板９と、光学補償板１０と液晶セル１１により液晶パネル１２を構成している。また、同プロジェクタは液晶セルを３枚有し、赤・緑・青（光の三原色）をそれぞれ液晶パネルに透過させ、プリズムでフルカラー合成する３ＬＣＤ方式のプロジェクタである。なお、以後特に必要のあるときは赤・緑・青の各々の光に使用する偏光板９、光学補償板１０、液晶セル１１および液晶パネル１２の符号に各々Ｒ・Ｇ・Ｂの記号を加え、例えば偏光板９Ｒ、液晶パネル１２Ｂなどと記載する。   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.

このプロジェクタの光源１は強い光を照射することができる水銀ランプを使用して構成されている。光源１から照射された光は集光レンズ２に屈折させられるため略並行光線となる。この平行光線はミラー３により進行方向を変えられミラー４に向かう。ミラー４は特定の波長の光を透過し、その他の波長の光を反射するダイクロイックミラーであるため、赤色光Ｒを透過しその他の波長の光を反射する。ミラー４を透過した赤色光Ｒはミラー５に向かうとともにミラー５で反射され、液晶パネル１２Ｒに向かう。一方ミラー４によって反射された赤色光Ｒを除く波長の光はミラー６に向かう。ミラー６は緑色光を反射し、青色光を透過させるダイクロイックミラーであるため、ミラー６で反射された緑色光Ｇは液晶パネル１２Ｇに向かうとともにミラー６を透過した青色光Ｂミラー７に向かう。ミラー７で反射された青色光Ｂはミラー８に向かうとともにミラー８で更に反射されて液晶パネル１２Ｂに向かう。   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.

液晶パネル１２に向かった赤・緑・青の各々の光はまず入力側の偏光板９により特定の直線偏光に偏光させられる。更に入力側の光学補償板１０により位相特性を調整された後に液晶セル１１を透過する。このとき、液晶セル１１は映写すべき映像に対応して印加された電圧に応じて透過光を偏光させる。液晶セル１１において偏光された偏光は、出力側の光学補償板１０により位相特性を調整された後に出力側の偏光板９によって、選択的に透過させられる。こうして液晶パネル１２を透過した映像を伴った光は各々プリズム１３に向かう。プリズム１３によって各々の光は屈折させられることによりいずれも投射レンズ１４に向けられるため、赤・緑・青の各々の光は再びフルカラー合成される。この合成光が投射レンズを介して図示しないスクリーンに投射されることにより、スクリーン上にカラー映像が表示される。   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.

図２は実施形態にかかる投写型映像表示装置の入射側の偏光板、光学補償板および固定部材の位置関係を示す斜視図であり、図３は同部分の投射レンズ１４側から見た図である。図３からみて左側赤色光用の偏光板９Ｒおよび光学補償板１０Ｒ、中央部に緑色光用の偏光板９Ｇおよび光学補償板１０Ｇ、右部に青色光用の偏光板９Ｂおよび光学補償板１０Ｂを備えている。左部、中央部、右部に囲まれた部分にはプリズム１３が存在するのであるが、説明の便宜のために取りはずして図示している。なお、以下、本明細書において上・下・左・右の語は図３に記載した方向に従い使用する。また、以後主に中央部の構造を説明し、左部および右部については同様であるのでその説明を省略する。   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.

中央部の左右には偏光板９を支持する偏光板ホルダー２０の外枠の周辺部である左右の辺をスライド式に挿入することができる一対の溝部材５２が設けられている。この一対の溝部材５２の上部から偏光板ホルダー２０を挿入することにより、偏光板ホルダー２０の左右方向の移動が規制される。また、偏光板ホルダー２０の外枠の下辺は底板５５に当接することによりその位置が固定される。また同様に中央部の左右であって一対の溝部材５２より手前側、すなわちプリズム側には、光学補償板１０を支持する光学補償板ホルダー３０の外枠の周辺部である左右の辺をスライド式に挿入することができる一対の溝部材５３が設けられている。この一対の溝部材５３の上部から光学補償板ホルダー３０を挿入することにより、光学補償板ホルダー３０の左右方向の移動が規制される。また、光学補償板ホルダー３０の外枠の下辺は底板５５に当接することによりその位置が固定される。なお、底板５５は一対の溝部材５２および一対の溝部材５３下端部に設けられているとともに、偏光板ホルダー２０の外枠の下辺の位置および光学補償板ホルダー３０の外枠の下辺の位置を規制して支持する支持部材として機能している。   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.

更に一対の溝部材５２および一対の溝部材５３の上側の端部間を接続するように把持部材４０が取り付けられる。偏光板ホルダー２０および光学補償板ホルダー３０は外枠の上部の一辺をこの把持部材４０によって弾性的に把持される。したがって、上述の一対の溝部材５２と、底板５５と、把持部材４０とによって偏光板ホルダーを弾性的に固定する偏光板ホルダー固定部を形成する。また同様に、上述の一対の溝部材５３と、底板５５と、把持部材４０とによって光学補償板ホルダーを弾性的に固定する光学補償板ホルダー固定部を形成する。   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.

図４（a）（b）に示すように、把持部材４０は偏光板ホルダー２０および光学補償板ホルダー３０の外枠の上辺部近傍を略覆うことができる左右方向に伸びた形状である。左端部には把持部材４０を螺子止めするための螺子穴４３が設けられており、右端部には対応する穴に差し込むための差込爪４４が右方向に突出している。更に螺子穴４３のすぐ右側上部には把持部材４０を着脱する際に一時的に保持するための取手４６が設けられている。また、取手４６の下部には偏光板ホルダー２０と光学補償板ホルダー３０とを照射光の方向から弾性的に固定するための板バネ構造を持つ１対の挟爪４１を備え、挟爪の右側には偏光板ホルダー２０と光学補償板ホルダー３０とを上部から弾性的に固定するための板バネ構造を持つ２対の押さえ爪４２を備えている。   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.

把持部材４０を取り付ける際には、図５（a）に示すように、まず取手４６を用いて把持部材４０を保持するとともに、一対の溝部材５２および一対の溝部材５３上端部右側近傍に設けられた差込穴に差込爪４４を差し込む。次に、図５（ｂ）に示すように、差し込まれた差込爪４４を支点に偏光板ホルダー２０と光学補償板ホルダー３０の上部を覆うように把持部材４０をかぶせ、螺子穴４３に螺子を通して止める。   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.

図６に示すように、把持部材４０を取り付けると、１対の挟爪４１が偏光板ホルダー２０および光学補償板ホルダー３０の上部左側に光の照射方向から挟み込むように当接し、１対の挟爪４１の弾性力によって、両者を互いに近づける方向に付勢する。偏光板ホルダー２０と光学補償板ホルダー３０との間には一対の溝部材５２と一対の溝部材５３との間を仕切る突出部５４があるため、偏光板ホルダー２０および光学補償板ホルダー３０は突出部５４に押し付けられる。すなわち、偏光板ホルダー２０および光学補償板ホルダー３０は面内方向と直交する方向への移動が挟爪４１の弾性力によって規制される。   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.

一方、把持部材４０を取り付けると、偏光板ホルダー２０および光学補償板ホルダー３０のそれぞれの上部末端部の左右に２対の押さえ爪４２が上部から当接し、２対の押さえ爪４２の弾性によって、両者が下向きに付勢される。偏光板ホルダー２０および光学補償板ホルダー３０は底板５５によって下向きへの移動をすでに規制されているため、偏光板ホルダー２０および光学補償板ホルダー３０は上下方向への移動が押さえ爪４２の弾性力によって規制される。   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.

すなわち把持部材４０を取り付けることにより、一対の溝部材５２・底板５５（支持部材）・把持部材４０を有する偏光板ホルダー固定部によって、偏光板ホルダー２０の左右・上下・面内方向と直交する方向からなるすべての方向の移動が規制され、偏光板ホルダー２０が弾性的に固定される。また、一対の溝部材５３・底板５５（支持部材）・把持部材４０を有する光学補償板ホルダー固定部によって光学補償板ホルダー３０の左右・上下・光の照射方向（面方向と直交する方向）のすべての方向の移動が規制され、光学補償板ホルダー３０が弾性的に固定される。   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.

図７に示すように、偏光板ホルダー２０は外枠２１と、外枠２１から内周に向かって突出する支持爪２３を有する。外枠２１の内周は偏光板９の外周より大きく作られている。支持爪２３は外枠の表面と裏面からそれぞれ突出しており、偏光板９は外枠２１に遊嵌されるとともに、表面から突出した支持爪２３と、裏面から突出した支持爪２３とによって偏光板ホルダー２０の外枠の内周内に支持される。   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.

上述のように外枠２１の内周は偏光板９の外周より大きく作られているため、上下方向および左右方向に遊びを有して支持される。また、表面から突出した支持爪２３の偏光板９に対向する面と、裏面から突出した支持爪２３の偏光板９に対向する面との偏光板９面に直交する方向の距離も偏光板９の厚みより大きいため、偏光板９は厚み方向にも遊びを有して支持される。したがって、偏光板９は偏光板ホルダー２０に支持されることにより外枠２１や支持爪２３より特段の応力を受けることがなく、歪や変形を生じることもない。   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.

また、上述のように偏光板９はこの偏光板ホルダー２０を介して固定部材に固定されるため、偏光板９が固定部材より直接力を受けることはない。また、偏光板ホルダー２０は固定部材に弾性的に固定される。この弾性的な固定に伴う応力は偏光板ホルダー２０に加わる。かかる応力により偏光板ホルダー２０は変形しうるが、その変形は上記遊びにより吸収され、偏光板９におよばない。なお、偏光板ホルダー２０の遊びの大きさは合目的的に決定される。すなわち、偏光板ホルダー２０から偏光板９が脱落したり、偏光板ホルダー２０内における偏光板９の移動により投写型映像表示装置が投射する映像に歪が生じない範囲において決められる所定寸法内で、偏光板ホルダー２０の変形を吸収しうる大きさに決定さける。かかる遊びの大きさは偏光板ホルダー２０に加わりうる力や偏光板ホルダー２０の強度に影響される。   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.

偏光板ホルダー２０の外枠２１の一方の表面には偏光板９の面内方向と直交する方向に部分的に突出した突起２４および２５が備えられている。図６に示すように、偏光板ホルダー２０個提示において、突起２４および２５は溝部材５２の溝壁に当接または近接し、偏光板ホルダー２０が偏光板９の面と直交する方向に移動することを部分的に規制する。偏光板ホルダー２０は上部において把持部材４０の挟爪４１によって偏光板９の面と直交する方向に移動することを規制されており、突起２４および２５が下部において同様の規制を行うことにより、偏光板ホルダー２０が偏光板９の面と直交する方向に移動すること一層規制できる。   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.

なお、光学補償板ホルダー３０は偏光板ホルダー２０と同一の構造および効果を有するためその説明を省略する。   The optical compensator holder 30 has the same structure and effect as the polarizing plate holder 20, and therefore description thereof is omitted.

上記実施形態によれば、以下のような効果を得ることができる。   According to the above embodiment, the following effects can be obtained.

（１）上記実施形態によると、偏光板ホルダー２０は偏光板９を同一面内およびこの面と直角方向に所定寸法内で移動可能とする遊びを有して支持するため、かかる遊びの範囲内であれば、偏光板ホルダーに生じた変形や歪が偏光板９に影響を与えない。また偏光板９が偏光板ホルダー２０を介して固定されるため、偏光板９を固定するための応力が、偏光板９に直接かかることがない。更に固定に伴う応力が偏光板ホルダー２０にかかった場合にも、偏光板ホルダー２０の変形が遊びによって吸収できる範囲内であれば、偏光板９が変形することや歪むことがない。したがって偏光板９が歪むことによる投射映像の歪みが抑制されている。   (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）また、着脱可能な把持部材４０を用いて偏光板ホルダー２０が偏光板ホルダー固定部に着脱可能に固定されるため、偏光板ホルダー２０を介して偏光板９を交換することができる。   (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）偏光板ホルダーは、偏光板の外周を遊びを有して取り巻く外枠と、外枠から内周に向かって突出する支持爪とによる単純な構成で形成されているため、安価に構成できる。   (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）上記実施形態によると、偏光板ホルダーを弾性的に固定する偏光板ホルダー固定部を備えるので、弾性力が偏光板ホルダーに加わり、偏光板に加わらない。したがって、上述のように弾性力による偏光板ホルダーの変形が偏光板ホルダーの遊びの範囲内であれば、偏光板に変形や歪が生じない。   (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）上記実施形態によると、偏光板ホルダー２０の外枠２１の一方の表面に偏光板９の面内方向と直交する方向に部分的に突出した突起を有し、この突起により前記偏光板ホルダーの面と直交する方向への移動を部分的に規制するため、偏光板ホルダーが、偏光板ホルダーの面と直交する方向に移動することを抑制する。   (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）上記実施形態によると、光学補償板ホルダーが前記偏光板ホルダーと同構造であり、光学補償板ホルダー固定部が偏光板ホルダー固定部と同構造であるため、光学補償板についても偏光板と同様に歪や変形が抑制されている。従って、光学補償板が変形することによる投射映像の歪みも抑制されている。また、光学補償板も交換可能である。   (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.

なお、本実施形態は以下のように変更してもよい。   In addition, you may change this embodiment as follows.

・上記実施形態において偏光板と光学補償板を備える投写型映像表示装置に本発明を適用したが、液晶セル１１の種類によっては光学補償板は必須ではない。光学補償板を省略できれば、コストダウンに資する。   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.

・上記実施形態において偏光板と光学補償板を備える投写型映像表示装置本発明を適用したが、光学補償板に変えてあるいは光学補償板と合わせて他の光学機能を有する板を用いてもよい。   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. .

・上記実施形態においては、偏光板および光学補償板の両者を同様の方法で固定したが、いずれか一方のみ上述の方法で固定し、他方は従来の方法で固定してもよい。いずれか一方のひずみや変形が特に問題とならない場合に有効である。   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.

・また、上記実施形態においては、いわゆる３ＬＣＤ方式と呼ばれる３枚の液晶パネルを使用する投写型映像表示装置に本発明を適用したが、他の形式の投写型映像表示装置に適用してもよい。少なくとも偏光板を使用する方式の投写型映像表示装置であればいずれにも適用可能である。   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.

本発明にかかる投写型映像表示装置は、偏光板に力がかかることによる歪を抑制することにより投射映像のひずみを抑制できるため、偏光板を使用する投写型映像表示装置に広範囲に利用可能である。   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.

実施形態にかかる投写型映像表示装置の光学系の模式図である。It is a schematic diagram of the optical system of the projection type video display apparatus concerning embodiment. 実施形態にかかる投写型映像表示装置の入射側の光学補償板および偏光板、支持部材周辺の斜視図である。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. 実施形態にかかる投写型映像表示装置の入射側の光学補償板および偏光板、支持部材周辺を投射レンズ側から見た図である。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. 実施形態にかかる投写型映像表示装置に用いられる把持部材の構造を説明する図であり、（ａ）は正面図・平面図・左右側面図および底面図であり、（ｂ）は斜視図である。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. . 実施形態にかかる投写型映像表示装置に用いられる把持部材の取り付け方法を説明する図であり、（ａ）は取り付け途中の斜視図であり、（ｂ）は取り付け終了時の斜視図である。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. 実施形態にかかる投写型映像表示装置の入射側の光学補償板および偏光板、支持部材周辺の一部断面図である。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. 実施形態にかかる投写型映像表示装置に用いられる偏光板ホルダーの構造を説明する図であり、（ａ）は６面図であり、（ｂ）は斜視図である。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.

符号の説明Explanation of symbols

１・・・光源、２・・・集光レンズ、３・・・ミラー、４・・・ミラー（ダイクロイックミラー）、５・・・ミラー、６・・・ミラー（ダイクロイックミラー）、７，８・・・ミラー、９，９Ｂ，９Ｇ，９Ｒ・・・偏光板、１０，１０Ｂ，１０Ｇ，１０Ｒ・・・光学補償板、１１・・・液晶セル、１２，１２Ｂ，１２Ｇ，１２Ｒ・・・液晶パネル、１３・・・プリズム、１４・・・投射レンズ、２０・・・偏光板ホルダー、２１・・・外枠、２３・・・支持爪、２４・・・突起、３０・・・光学補償板ホルダー、４０・・・把持部材、４１・・・挟爪、４２・・・押さえ爪、４３・・・螺子穴、４４・・・差込爪、４６・・・取手、５２，５３…溝部材、５４・・・突出部、５５・・・底板（支持部材）、Ｂ・・・青色光、Ｇ・・・緑色光、Ｒ・・・赤色光。   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)

光源より照射された光を偏光させる偏光板と、
前記偏光板の外周を取り巻く外枠と外枠から内周に向かって突出すると共に、前記偏
光板を遊びを有して支持する支持爪とを有する偏光板ホルダーと、
前記偏光板ホルダーを固定する上方開口の偏光板ホルダー固定部と、
前記偏光板ホルダー固定部に形成され、前記偏光板ホルダーの外枠の周辺部である左右の片が上方からスライド式に挿入される一対の偏光板用溝部材とを備え、
前記一対の偏光板用溝部材の底面は平面状に形成されていると共に、一対の偏光板用溝部材に挿入される前記偏光板ホルダーの外枠の周辺部である左右の片には、偏光板の面方向と直交する方向に部分的に突出すると共に、弾性を有する突起が形成され、一対の偏光板用溝部材に上方から挿入された偏光板ホルダーは、偏光板ホルダーの外枠の上部が把持部材によって弾性的に把持されることにより固定されることを特徴とする投写型映像表示装置。 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. 前記偏光板により生じた偏光の位相を変化させる光学補償板と、
前記光学補償板の外周を取り巻く外枠と外枠から内周に向かって突出すると共に、前記光学補償板を遊びを有して支持する支持爪とを有する光学補償板ホルダーと、
前記一対の偏光板用溝部材に隣接して形成され、前記光学補償板ホルダーの外枠の周辺部である左右の片が上方からスライド式に挿入される一対の光学補償板用溝部材とを備え、
前記光学補償用溝部材の底面は平面状に形成されていると共に、一対の光学補償板用溝部材に挿入される前記光学補償板ホルダーの外枠の周辺部である左右の片には、光学補償板の面方向と直交する方向に部分的に突出すると共に、弾性を有する突起が形成され、一対の光学補償板用溝部材に上方から挿入された光学補償板ホルダーは、前記把持部材によって光学補償板ホルダーの外枠の上部が弾性的に把持されることを特徴とする請求項１に記載の投写型映像表示装置。 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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