JP2554294B2 - Reflective LCD overhead projector - Google Patents

Reflective LCD overhead projector

Info

Publication number
JP2554294B2
JP2554294B2 JP3154361A JP15436191A JP2554294B2 JP 2554294 B2 JP2554294 B2 JP 2554294B2 JP 3154361 A JP3154361 A JP 3154361A JP 15436191 A JP15436191 A JP 15436191A JP 2554294 B2 JP2554294 B2 JP 2554294B2
Authority
JP
Japan
Prior art keywords
liquid crystal
polarizing plate
crystal panel
fresnel lens
transmissive liquid
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
JP3154361A
Other languages
Japanese (ja)
Other versions
JPH052219A (en
Inventor
章浩 本間
三城 梶川
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Japan Aviation Electronics Industry Ltd
Original Assignee
Japan Aviation Electronics Industry Ltd
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
Application filed by Japan Aviation Electronics Industry Ltd filed Critical Japan Aviation Electronics Industry Ltd
Priority to JP3154361A priority Critical patent/JP2554294B2/en
Publication of JPH052219A publication Critical patent/JPH052219A/en
Application granted granted Critical
Publication of JP2554294B2 publication Critical patent/JP2554294B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/50—Fuel cells

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】この発明は液晶パネルのミラーフ
レネルレンズと反対側の偏光板を分離して投影レンズ側
に設けることにより二重像を防止するようにした偏光板
分離方式の反射型液晶オーバーヘッドプロジェクタに関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reflection type liquid crystal of a polarizing plate separation type in which a polarizing plate on a side opposite to a mirror Fresnel lens of a liquid crystal panel is separated and provided on a projection lens side to prevent a double image. It relates to an overhead projector.

【０００２】[0002]

【従来の技術】この種の偏光板分離方式の反射型液晶オ
ーバーヘッドプロジェクタは特開平２−１９３１８３号
公報で提案されている。この構成を図６を参照して簡単
に説明する。基台１１上にミラーフレネルレンズ１２が
取付けられ、基台１１に立てられた支柱１３上に、基台
１１と対向した保持部１４が取付けられ、保持部１４に
光源１５、投影レンズ１６、ミラー１７が取付けられて
いる。ミラーフレネルレンズ１２上に液晶表示器１８が
配される。液晶表示器１８はミラーフレネルレンズ１２
と対向した透過型液晶パネル１９と、その周縁を支持す
ると共に、その液晶パネル１９を駆動する回路を含む駆
動部２１とよりなる。この液晶パネル１９は液晶セル２
２の片面にのみ偏光板２４が取付けられており、その偏
光板２４がミラーフレネルレンズ１２と対向している。
通常の液晶パネルにおいて偏光板２４と対をなして用い
られるもう１つの偏光板は液晶パネル１９から分離され
て投影レンズ１６側に分離偏光板２５として配される。2. Description of the Related Art A reflective liquid crystal overhead projector of this type using a polarizing plate separation system has been proposed in Japanese Patent Application Laid-Open No. 2-193183. This configuration will be briefly described with reference to FIG. A mirror Fresnel lens 12 is mounted on a base 11, and a holding unit 14 facing the base 11 is mounted on a support 13 erected on the base 11, and a light source 15, a projection lens 16, and a mirror are mounted on the holding unit 14. 17 are attached. A liquid crystal display 18 is arranged on the mirror Fresnel lens 12. The liquid crystal display 18 is a mirror Fresnel lens 12
A transmissive liquid crystal panel 19 opposed to the liquid crystal panel 19 and a driving unit 21 that supports the periphery of the liquid crystal panel 19 and includes a circuit for driving the liquid crystal panel 19. This liquid crystal panel 19 is a liquid crystal cell 2
The polarizing plate 24 is attached only to one side of the second polarizing plate 24, and the polarizing plate 24 faces the mirror Fresnel lens 12.
Another polarizing plate used as a pair with the polarizing plate 24 in a normal liquid crystal panel is separated from the liquid crystal panel 19 and disposed as a separation polarizing plate 25 on the projection lens 16 side.

【０００３】光源１５からのランダムな偏光の入射光Ｌ
１は液晶セル２２を通過する前後でもランダムな偏光で
あり、偏光板２４を通過後、直線偏光となった反射光Ｌ
２は液晶セル２２を通過した時に、その位置の表示内容
に応じて偏光状態が変化し、その反射光Ｌ２が分離偏光
板２５を通過してその偏光状態に応じて強度が変化し、
この強度変化した光が投影レンズ１６によりミラー１７
を介して図に示していないスクリーンに投影され、液晶
表示パネル１９の表示像がそのスクリーンに拡大表示さ
れる。このようにして、液晶パネル１９における入射光
Ｌ１の入射位置と、反射光Ｌ２の出射位置とがずれて
も、前者に影響されることなく、後者のみが像として表
示され２重像とならない。Incident light L of random polarization from the light source 15
1 is a random polarized light before and after passing through the liquid crystal cell 22, and is a linearly polarized reflected light L after passing through the polarizing plate 24.
2, when passing through the liquid crystal cell 22, the polarization state changes according to the display content at that position, and the reflected light L2 passes through the separation polarizer 25, and the intensity changes according to the polarization state.
The light whose intensity has changed is reflected by the projection lens 16 into the mirror 17.
Is projected onto a screen not shown in the figure via the, and the display image of the liquid crystal display panel 19 is enlarged and displayed on the screen. In this way, even if the incident position of the incident light L1 on the liquid crystal panel 19 deviates from the emitting position of the reflected light L2, only the latter is displayed as an image without being affected by the former, and a double image is not formed.

【０００４】[0004]

【発明が解決しようとする課題】従来においては液晶パ
ネル１９と分離偏光板２５とが機械的に離されているた
め、液晶表示器１８及び分離偏光板２５を外して例えば
フィルムをミラーフレネルレンズ１２上に配し、そのフ
ィルムの像を拡大表示するために使用し、その後、再び
液晶表示器１８を用いて拡大表示する際に、液晶パネル
１９と分離偏光板２５との位置関係を拡大表示像を見な
がら調整する必要があり、このような調整をいちいち行
うことは面倒なことであった。In the prior art, since the liquid crystal panel 19 and the separating polarizing plate 25 are mechanically separated from each other, the liquid crystal display 18 and the separating polarizing plate 25 are removed, and a film, for example, a mirror Fresnel lens 12 is used. It is used for enlarging and displaying the image of the film on the upper side, and then, when enlarging and displaying using the liquid crystal display 18, the positional relationship between the liquid crystal panel 19 and the separating polarizing plate 25 is enlarged and displayed. It is necessary to make adjustments while watching, and it is troublesome to make such adjustments one by one.

【０００５】[0005]

【課題を解決するための手段】この発明によれば液晶パ
ネルと分離偏光板とを連結してその所定の相対位置関係
を保持する連結手段が設けられている。この連結手段は
組み立て式とすることができる。またこの連結手段に、
液晶パネルと分離偏光板との相対位置関係を調整するこ
とができる調整手段を設けることができる。 According to the present invention, there is provided a connecting means for connecting the liquid crystal panel and the separation polarizing plate to maintain a predetermined relative positional relationship between them. This connecting means can be of the prefabricated type. Also, to this connecting means,
An adjusting unit that can adjust the relative positional relationship between the liquid crystal panel and the separation polarizing plate can be provided.

【０００６】[0006]

【実施例】図１にこの発明の実施例を示し、図６と対応
する部分に同一符号を付けてある。この実施例では支柱
１３と反対側でこれと対向した支持柱５１が液晶表示器
１８の駆動部２１上に立てられ、支持柱５１上に、投影
レンズ１６の直上において液晶パネル１９と対向した枠
状体５２を固定し、枠状体５２に分離偏光板２５がはめ
込まれて保持される。この状態で分離偏光板２５と、液
晶パネル１９との位置関係が、最良の状態、つまり拡大
投影像が最も良く見える状態とされている。支持柱１５
及び枠状体５２は連結手段５３を構成している。FIG. 1 shows an embodiment of the present invention, in which parts corresponding to those in FIG. 6 are designated by the same reference numerals. In this embodiment, a support column 51, which is opposite to the support column 13 and is opposed thereto, is erected on the drive unit 21 of the liquid crystal display 18, and a frame facing the liquid crystal panel 19 on the support column 51 directly above the projection lens 16. The shape body 52 is fixed, and the separation polarization plate 25 is fitted and held in the frame shape body 52. In this state, the positional relationship between the separation polarization plate 25 and the liquid crystal panel 19 is set to the best state, that is, the enlarged projected image is best seen. Support pillar 15
The frame-shaped body 52 constitutes a connecting means 53.

【０００７】このように構成されているから液晶表示器
１８を外し、再びこれをミラーフレネルレンズ１２上に
配置した時は、自動的に液晶パネル１９と分離偏光板２
５との位置関係は最良なものとなり、その調整を必要と
しない。図１Ａに点線で示すように分離偏光板２５がレ
ンズ１６の直下に位置するように連結手段５３を構成し
てもよい。Due to this structure, when the liquid crystal display 18 is removed and is again placed on the mirror Fresnel lens 12, the liquid crystal panel 19 and the separation polarization plate 2 are automatically arranged.
The positional relationship with 5 is the best and does not require adjustment. The connecting means 53 may be configured so that the separating polarization plate 25 is located immediately below the lens 16 as shown by the dotted line in FIG. 1A.

【０００８】連結手段５３を組み立て式に構成すること
もできる。例えば図２に示すように、支持柱５１と枠状
体５２とを別体構成とし、ねじ５４で枠状体５２を支持
柱５１に取外し自在に取付け、支持柱５１の少くとも下
端部を２本の脚部５１ａ，５１ｂとし、脚部５１ａ，５
１ｂを、駆動部２１の上面に形成した取付け穴５５ａ，
５５ｂに取外し自在に嵌合挿入して支持柱５１を駆動部
２１に取付ける。The connecting means 53 can also be constructed in an assembled manner. For example, as shown in FIG. 2, the support column 51 and the frame-shaped body 52 are separately configured, and the frame-shaped body 52 is detachably attached to the support column 51 with a screw 54, and at least the lower end portion of the support column 51 is 2 or more. Book legs 51a, 51b, and legs 51a, 5
1b is a mounting hole 55a formed on the upper surface of the drive unit 21,
The support column 51 is attached to the drive unit 21 by being removably fitted and inserted into the 55b.

【０００９】あるいは図３に示すように支持柱５１は２
本の脚部５１ａ，５１ｂのみで構成され、支持柱５１は
液晶表示器１８の駆動部に回動自在に立てられ、枠状体
５２は脚部５１ａ，５１ｂの上端間に回動自在に取付け
られている。液晶表示器１８を使用しない時は脚部５１
ａ，５１ｂを液晶パネル１９上に倒し、かつ枠状体５２
を回動して脚部５１ａと５１ｂ間に配置し、液晶パネル
１９と対接させる。Alternatively, as shown in FIG.
The book is composed of only the leg portions 51a and 51b, the support column 51 is rotatably set up on the drive portion of the liquid crystal display 18, and the frame 52 is rotatably attached between the upper ends of the leg portions 51a and 51b. Has been. When not using the liquid crystal display 18, the legs 51
a and 51b are laid down on the liquid crystal panel 19, and the frame-shaped body 52
Is rotated to be placed between the leg portions 51a and 51b and brought into contact with the liquid crystal panel 19.

【００１０】この支持柱５１の回動可動保持は、例えば
図４Ａに示すように、支持柱５１ａの下部を軸５５によ
り駆動部２１に対し回動自在に取付け、軸５５の下にお
いて駆動部２１内に凹部５６を形成し、その凹部５６内
にばね５７により突起５８を上方に偏倚して配し、点線
で示すように脚部５１ａを立てると突起５８をばね５７
に抗して引き込めた後、脚部５１ａの下端に形成された
くぼみ５９内に突起５８がばね５７によりはめ込められ
て、脚部５１ａが立った状態が保持される。しかし脚部
５１ａを強く回動すると脚部５１ａを倒すことができ
る。To rotatably and movably support the support column 51, for example, as shown in FIG. 4A, the lower portion of the support column 51a is rotatably attached to the drive unit 21 by a shaft 55, and the drive unit 21 is provided under the shaft 55. A concave portion 56 is formed in the inside of the concave portion 56, and a protrusion 58 is biased upward by a spring 57 in the concave portion 56. When the leg portion 51a is stood up as shown by a dotted line, the protrusion 58 is formed by the spring 57.
After being retracted against, the projection 58 is fitted into the recess 59 formed at the lower end of the leg portion 51a by the spring 57, and the leg portion 51a is held in a standing state. However, if the leg portion 51a is strongly rotated, the leg portion 51a can be tilted.

【００１１】また図４Ｂ，Ｃに示すように枠状体５２が
軸６１により脚部５１ａ，５１ｂ間に回動自在に保持さ
れ、枠状体５２がその枠面が脚部５１ａ，５１ｂと同一
面にある状態、つまり図３Ｂに示したように液晶表示器
１８に収納した状態から、脚部５１ａ，５１ｂを立て、
枠状体５２を２７０度回動すると、枠状体５２の一面
が、脚部５１ａ，５１ｂの内側に突出して固定したスト
ッパ６２上に衝合して枠状体５２は水平に保持される。As shown in FIGS. 4B and 4C, the frame 52 is rotatably held by the shaft 61 between the legs 51a and 51b, and the frame 52 has the same frame surface as the legs 51a and 51b. From the state of being on the surface, that is, the state of being accommodated in the liquid crystal display 18 as shown in FIG.
When the frame-shaped body 52 is rotated by 270 degrees, one surface of the frame-shaped body 52 abuts on the stopper 62 that is projected and fixed inside the leg portions 51a and 51b, and the frame-shaped body 52 is held horizontally.

【００１２】反射型オーバーヘッドプロジェクタは大き
さに複数種類があり、例えば支柱１３の高さが異なった
ものがあり、図１Ａのように液晶表示器１８及び分離偏
光板２５を取付けようとすると枠状体５２がミラー１７
とぶつかり、取付けることができない場合がある。また
保持部１４の水平方向の長さが異なり、つまり投影レン
ズ１６の水平方向の位置が異なり、液晶表示器１８を取
付けた時に、分離偏光板２５が投影レンズ１６と対向し
ないことが生じる。このような点から図５Ａに示すよう
に支持柱５１の長さＬ1 を調整可能とし、かつ分離偏光
板２５の支持柱５１からの突出長Ｌ2 を調整可能とし、
更に望ましくは支持柱５１の水平に対する角度θ1 、及
び枠状体５２の支持体５１に対する角度θ2 をそれぞれ
調整できるようにすることが望ましい。これらＬ1 ，Ｌ
2 及び／又はθ1 ，θ2 を調整することにより分離偏光
板２５の液晶パネル１９からの高さＨ1 と、液晶パネル
１９の基準位置からの水平距離Ｌ3 とを調整することが
できる。There are a plurality of types of reflective overhead projectors, for example, those having different heights of the support columns 13, and when the liquid crystal display 18 and the separating polarizing plate 25 are mounted as shown in FIG. Body 52 is mirror 17
It may collide with and cannot be installed. Further, the horizontal length of the holding portion 14 is different, that is, the horizontal position of the projection lens 16 is different, so that the separation polarizing plate 25 may not face the projection lens 16 when the liquid crystal display 18 is attached. From such a point, as shown in FIG. 5A, the length L 1 of the supporting column 51 can be adjusted, and the protruding length L 2 of the separating polarizing plate 25 from the supporting column 51 can be adjusted.
More preferably an angle theta 1 with respect to the horizontal support posts 51, and it is desirable that the angle theta 2 to the support 51 of the frame body 52 can be adjusted respectively. These L 1 , L
By adjusting 2 and / or θ 1 and θ 2 , the height H 1 of the separation polarizing plate 25 from the liquid crystal panel 19 and the horizontal distance L 3 from the reference position of the liquid crystal panel 19 can be adjusted.

【００１３】Ｌ1 の調整のための構成は例えば図５Ｂに
示すように支持柱５１として脚部５１ａ，５１ｂ間に可
動部５１ｃを長手方向に移動自在に保持して構成し、可
動部５１ｃの両側面に突起６３ａ，６３ｂをばね６４で
外方へ偏倚して設け、脚部５１ａ，５１ｂの対向内面に
突起６３ａ，６３ｂとそれぞれ係合するくぼみ６５ａ，
６５ｂを長手方向において複数個配列形成し、突起６３
ａ，６３ｂを何れのくぼみ６５ａ，６５ｂと係合させる
かにより、Ｌ1 を調整する。The structure for adjusting L 1 is, for example, as shown in FIG. 5B, a movable column 51c is supported as a support column 51 between leg portions 51a and 51b so as to be movable in the longitudinal direction. Protrusions 63a, 63b are provided on both side faces by being biased outward by a spring 64, and recesses 65a, 63a, 63b for engaging the protrusions 63a, 63b, respectively, on the inner surfaces of the legs 51a, 51b facing each other.
A plurality of 65b are arrayed in the longitudinal direction to form protrusions 63
L 1 is adjusted depending on which of the depressions 65a and 65b the a and 63b are engaged with.

【００１４】Ｌ2 の調整のための構成は例えば図５Ｃに
示すように、支持柱５１から対向した案内レール６６
ａ，６６ｂを突出させ、案内レール６６ａ，６６ｂ間
に、枠状体５２をその両側部を係合させて案内レール６
６ａ，６６ｂに沿って摺動自在に保持させる。枠状体５
２を案内レール６６ａ，６６ｂに沿って移動させてＬ2
を調整する。The structure for adjusting L 2 is, for example, as shown in FIG. 5C, a guide rail 66 facing the support column 51.
a and 66b are projected, and the frame-shaped body 52 is engaged between the guide rails 66a and 66b at both side portions thereof.
It is held slidably along 6a and 66b. Frame 5
2 along the guide rails 66a and 66b to move L 2
To adjust.

【００１５】θ1 の調整のため構成は例えば図５Ｄに示
すように脚部５１ａの駆動部２１の溝に挿入された部分
を軸５５を中心に回動自在とし、軸５５の両側で脚部５
１ａの両側面から突起６７をばね６８により外側に偏倚
して突出させ、駆動部２１の溝の両壁面に、軸５５を中
心とする円上に形成したくぼみ６９の何れかと係合させ
る。その係合するくぼみ６９を選択してθ1 を調整す
る。For the adjustment of θ 1 , for example, as shown in FIG. 5D, the portion of the leg portion 51a inserted into the groove of the driving portion 21 is rotatable about the shaft 55, and the leg portion is provided on both sides of the shaft 55. 5
A protrusion 67 is biased outward by a spring 68 from both side surfaces of 1a, and is engaged with either wall surface of the groove of the drive portion 21 with one of the recesses 69 formed in a circle centered on the shaft 55. The engaging recess 69 is selected and θ 1 is adjusted.

【００１６】θ2 の調整も、θ1 の調整とほぼ同様な機
構で行うことができる。簡単に述べると、案内レール６
６ａ，６６ｂの一端の連結部７１（図５Ｃ）の両端面か
ら軸７２を突出させ、軸７２により支持柱５１に回動自
在に取付け、図に示していない支持柱５１からばねによ
り外方に偏倚して突出させた突起を、軸７２を中心とす
る円上の複数のくぼみ７３の何れかに係合させてθ2 を
調整する。The adjustment of θ 2 can be performed by a mechanism substantially similar to the adjustment of θ 1 . Briefly, the guide rail 6
A shaft 72 is projected from both end surfaces of a connecting portion 71 (FIG. 5C) at one end of 6a, 66b, and is rotatably attached to a support column 51 by the shaft 72. The support column 51 (not shown) is springed outward. The biased and projected protrusion is engaged with any one of a plurality of recesses 73 on a circle centered on the shaft 72 to adjust θ 2 .

【００１７】[0017]

【発明の効果】以上述べたようにこの発明によれば液晶
表示器１８と分離偏光板２５とが連結手段により連結さ
れているため、液晶表示器をプロジェクタに取付けるご
とに分離偏光板２５の位置関係を調整する必要がない。
請求項１の発明によれば、液晶表示器をオーバーヘッド
プロジェクタから外した時に、突出した分離偏光板が邪
魔にならないようにすることができる。請求項２の発明
によれば使用するオーバーヘッドプロジェクタの大きさ
に応じて分離偏光板２５の位置を調整設定することがで
き、一度、設定すればそのプロジェクタに対しては液晶
表示器の取付けを繰返しても分離偏光板の位置調整は必
要としない。As described above, according to the present invention, since the liquid crystal display 18 and the separating polarizing plate 25 are connected by the connecting means, the position of the separating polarizing plate 25 is changed every time the liquid crystal display is attached to the projector. No need to adjust relationships.
According to the invention of claim 1 , when the liquid crystal display is detached from the overhead projector, it is possible to prevent the protruding separation polarizing plate from getting in the way. According to the invention of claim 2, the position of the separation polarizing plate 25 can be adjusted and set according to the size of the overhead projector to be used, and once set, the liquid crystal display is repeatedly attached to the projector. However, it is not necessary to adjust the position of the separation polarizing plate.

【図面の簡単な説明】[Brief description of drawings]

【図１】Ａはこの発明の実施例を示す側面図、Ｂはその
液晶表示器及び分離偏光板の連結状態を示す斜視図であ
る。FIG. 1A is a side view showing an embodiment of the present invention, and B is a perspective view showing a connected state of a liquid crystal display and a separating polarizing plate.

【図２】Ａは連結手段５３を組み立て方式とした請求項
１の発明の実施例の要部を示す斜視図、Ｂはその分解斜
視図である。[Figure 2] claims A is obtained by a method assembling a coupling means 53
1 is a perspective view showing a main part of an embodiment of the invention of No. 1 , and B is an exploded perspective view thereof.

【図３】Ａは請求項１の発明の他の実施例の要部を示す
斜視図、Ｂはその分離偏光板を液晶表示器に収納した状
態を示す斜視図である。3A is a perspective view showing a main part of another embodiment of the first aspect of the invention, and FIG. 3B is a perspective view showing a state in which the separation polarizing plate is housed in a liquid crystal display.

【図４】Ａは図３の実施例における脚部５１ａの立てた
状態の保持機構の例を示す断面図、Ｂは図３中の枠状体
の保持機構の例を説明するための支持柱の上部を示す斜
視図、Ｃはその枠状体を示す斜視図である。4A is a cross-sectional view showing an example of a holding mechanism in which the leg portion 51a is in an upright state in the embodiment of FIG. 3, and B is a supporting column for explaining an example of a frame-shaped body holding mechanism in FIG. Is a perspective view showing the upper part of FIG. 1, and C is a perspective view showing the frame-shaped body thereof.

【図５】Ａは請求項２の発明の実施例の要部を示す斜視
図、Ｂはその支持柱５１の長さ調整機構の例を示す断面
図、Ｃは枠状体移動機構の例を示す斜視図、Ｄは支持柱
５１の角度調整機構の例を示す断面図である。5A is a perspective view showing an essential part of an embodiment of the invention of claim 2 , B is a sectional view showing an example of a length adjusting mechanism of a support column 51 thereof, and C is an example of a frame-shaped body moving mechanism. The perspective view shown is D, and D is a sectional view showing an example of an angle adjusting mechanism of the support column 51.

【図６】従来の反射型液晶オーバーヘッドプロジェクタ
を示す側面図。FIG. 6 is a side view showing a conventional reflective liquid crystal overhead projector.

Claims (2)

(57)【特許請求の範囲】(57) [Claims] 【請求項１】 光源からの光をミラーフレネルレンズに
入射して反射させ、片面にのみ偏光板を有する透過型液
晶パネルを、その偏光板を上記ミラーフレネルレンズ側
として、そのミラーフレネルレンズ上に配し、 その透過型液晶パネルの表示像を投影レンズに集光して
スクリーンに投影し、かつ上記投影レンズ側に、上記偏
光板と対をなす分離偏光板を設けた反射型液晶オーバー
ヘッドプロジェクタにおいて、 上記透過型液晶パネルは取外し自在とされ、 その透過型液晶パネルと上記分離偏光板とを連結してそ
の相対位置関係を保持する連結手段が設けられ、その連
結手段が組み立て式に構成されていることを特徴とする
反射型液晶オーバーヘッドプロジェクタ。1. A transmissive liquid crystal panel having light from a light source incident on and reflected by a mirror Fresnel lens and having a polarizing plate on only one side thereof, with the polarizing plate being the mirror Fresnel lens side, on the mirror Fresnel lens. In a reflective liquid crystal overhead projector, the display image of the transmissive liquid crystal panel is condensed on a projection lens and projected onto a screen, and a separation polarizing plate paired with the polarizing plate is provided on the projection lens side. the transmission type liquid crystal panel is a detachable, coupling means for holding the relative positional relationship is provided, et al are coupled with its transmissive liquid crystal panel and the separation polarizing plate, the communication
A reflection type liquid crystal overhead projector in which the connecting means is constructed in an assembled manner . 【請求項２】 光源からの光をミラーフレネルレンズに
入射して反射させ、片面にのみ偏光板を有する透過型液
晶パネルを、その偏光板を上記ミラーフレネルレンズ側
として、そのミラーフレネルレンズ上に配し、 その透過型液晶パネルの表示像を投影レンズに集光して
スクリーンに投影し、かつ上記投影レンズ側に、上記偏
光板と対をなす分離偏光板を設けた反射型液晶オーバー
ヘッドプロジェクタにおいて、 上記透過型液晶パネルは取外し自在とされ、 その透過型液晶パネルと上記分離偏光板とを連結してそ
の相対位置関係を保持する連結手段が設けられ、その連
結手段が上記透過型液晶パネルと上記分離偏光板との相
対位置関係を調整できる調整手段を含むことを特徴とす
る 反射型液晶オーバーヘッドプロジェクタ。2. A mirror Fresnel lens for transmitting light from a light source
A transmissive liquid that enters and reflects and has a polarizing plate on only one side.
Crystal panel with its polarizing plate on the mirror Fresnel lens side
As the mirror Fresnel lens, and the display image of the transmissive liquid crystal panel is focused on the projection lens.
Project it on the screen and move it to the projection lens side.
Reflective liquid crystal over with separate polarizing plate paired with light plate
In the head projector, the transmissive liquid crystal panel is detachable, and the transmissive liquid crystal panel and the separating polarization plate are connected to each other.
Connection means for maintaining the relative positional relationship of the
The connecting means is a phase of the transmission type liquid crystal panel and the separation polarizing plate.
Characterized by including an adjusting means capable of adjusting the positional relationship
A reflective liquid crystal overhead projector.
JP3154361A 1991-06-26 1991-06-26 Reflective LCD overhead projector Expired - Lifetime JP2554294B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3154361A JP2554294B2 (en) 1991-06-26 1991-06-26 Reflective LCD overhead projector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3154361A JP2554294B2 (en) 1991-06-26 1991-06-26 Reflective LCD overhead projector

Publications (2)

Publication Number Publication Date
JPH052219A JPH052219A (en) 1993-01-08
JP2554294B2 true JP2554294B2 (en) 1996-11-13

Family

ID=15582479

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3154361A Expired - Lifetime JP2554294B2 (en) 1991-06-26 1991-06-26 Reflective LCD overhead projector

Country Status (1)

Country Link
JP (1) JP2554294B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR19980059335A (en) * 1996-12-31 1998-10-07 손욱 Reflective Liquid Crystal Display

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01140516U (en) * 1988-03-22 1989-09-26

Also Published As

Publication number Publication date
JPH052219A (en) 1993-01-08

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