JP4043293B2

JP4043293B2 - Projection display

Info

Publication number: JP4043293B2
Application number: JP2002158380A
Authority: JP
Inventors: 和紀田辺; 和宣堀川
Original assignee: Panasonic Corp; Matsushita Electric Industrial Co Ltd
Current assignee: Panasonic Corp; Panasonic Holdings Corp
Priority date: 2002-05-31
Filing date: 2002-05-31
Publication date: 2008-02-06
Anticipated expiration: 2022-05-31
Also published as: JP2004004206A

Description

【０００１】
【発明の属する技術分野】
本発明は、光源からの光束を情報に応じて画素ごとに変調可能なパネル状のライトバルブに照射し、そのライトバルブの像を投写レンズにより装置外のスクリーンに拡大投写する投写型表示装置に関するものである。
【０００２】
【従来の技術】
従来の投写型表示装置に、液晶パネルやミラーアレイ素子をライトバルブとして使用したものが知られている。液晶パネルやミラーアレイ素子（以下、ライトバルブという）を３枚利用した投写型表示装置では、３枚のライトバルブで画素ごとに変調された透過光もしくは反射光を再合成して投写レンズに導くためのプリズムを使用しているものが一般的であり、それらパネル状ライトバルブとプリズムの入出射面に対して投写レンズの光軸を正確に直交させることが、投写画像の画質を損なわないために必要である。高輝度で大型の投写型表示装置では、パネル状ライトバルブに対して投写レンズを上下、左右に平行移動させて投写画像位置を微調整する投写レンズシフト機構を備えているので、この投写レンズシフト機構全体を移動させることで、投写レンズの光軸の傾きを調整する方式を採っている。
【０００３】
【発明が解決しようとする課題】
しかし、この種の投写型表示装置には、高輝度化、高画質化、高機能化とともに、セットサイズの小型化が要求されており、従来のように投写レンズの光軸がパネル状ライトバルブやプリズムの入出射面に直交するように投写レンズシフト機構全体を移動させるのでは、装置全体の構成が複雑となり、コストアップや装置の大型化につながる等の問題があった。
【０００４】
本発明は上記問題を解決するもので、投写レンズシフト機構全体を移動させることなく投写レンズの傾きを調整することができ、高画質が得られる投写型表示装置を提供することを目的とする。
【０００５】
【課題を解決するための手段】
上記課題を解決するために、請求項１記載の発明は、複数の画素から構成され情報に応じて画素毎に変調可能なパネル状のライトバルブと、前記ライトバルブに光源からの光線を照射する照明光学手段と、前記ライトバルブの像をスクリーンに拡大投写するための投写レンズと、前記投写レンズを搭載し複数のねじ穴および複数の取り付け穴を有する投写レンズマウントとを有した投写型表示装置において、前記投写レンズマウントに取り付けるための複数の取り付け穴が形成された前記投写レンズのフランジと、前記投写レンズマウントと前記フランジの間に配された調整板と、前記投写レンズマウントに取り付けられ前記調整板を前記レンズマウントの方向に付勢する調整板付勢手段と、前記投写レンズマウントのねじ穴に螺合する複数の調整ねじと、前記調整板および前記調整板付勢手段に係合する複数の調整板取り付け部材と、前記フランジの取り付け穴および前記投写レンズマウントの取り付け穴に配置され前記投写レンズを前記投写レンズマウントに対して前記調整板が介在する状態で保持する複数の投写レンズ取り付け用ねじと、を備え、前記調整板は、前記投写レンズフランジ側に前記調整ねじの頭部が当接するねじ当たり面と、前記調整ねじを調整するための工具を挿入する貫通穴と、前記調整板取り付け部材が係合する貫通穴と、を有する構成としたものである。
【０００６】
請求項２記載の発明は、複数の画素から構成され情報に応じて画素毎に変調可能なパネル状のライトバルブと、前記ライトバルブに光源からの光線を照射する照明光学手段と、前記ライトバルブの像をスクリーンに拡大投写するための投写レンズと、前記投写レンズを搭載し複数の取り付け穴を有する投写レンズマウントとを有した投写型表示装置において、前記投写レンズマウントに取り付けるための複数の取り付け穴が形成された前記投写レンズのフランジと、前記投写レンズマウントと前記フランジの間に配され複数のねじ穴を有する調整板と、前記調整板に取り付けられ前記フランジを前記レンズマウントの方向に付勢する調整板付勢手段と、前記調整板のねじ穴に螺合する複数の調整ねじと、前記フランジおよび前記調整板付勢手段に係合する複数の調整板取り付け部材と、前記フランジの取り付け穴および前記投写レンズマウントの取り付け穴に配置され前記投写レンズを前記投写レンズマウントに対して前記調整板が介在する状態で保持する複数の投写レンズ取り付け用ねじと、を備え、前記フランジは、前記調整ねじを調整するための工具を挿入する貫通穴と、前記調整板取り付け部材が係合する貫通穴と、前記調整板側に前記調整ねじの頭部が当接するねじ当たり面を有する構成としたものである。
【０００７】
上記した各構成によれば、投写レンズの取り付け部分を僅かに変更し、部品を追加することによって、投写レンズの傾きを調整することができ、高画質を得ることが可能になる。
【０００８】
【発明の実施の形態】
以下、本発明の実施の形態を、図面を用いて説明する。
（実施の形態１）
図１は本発明の実施の形態１における投写型表示装置の概略全体構成を示す斜視図、図２は同投写型表示装置の投写レンズ取り付け部分の分解斜視図、図３は同投写型表示装置の投写レンズ取り付け部分の一部拡大断面図である。
【０００９】
図１に示すように、この投写型表示装置は、装置外のスクリーンに像を拡大投写するための投写レンズ１と、投写レンズ１を搭載し光軸シフトとフォーカス方向の移動を調整可能な投写レンズマウント２と、情報に応じて個々の画素毎に光を透過若しくは遮光の変調可能なライトバルブとしての液晶パネル３（３Ｒ、３Ｇ、３Ｂ）と、これらの液晶パネル３（３Ｒ、３Ｇ、３Ｂ）を透過した光を再合成し投写レンズ１方向に出射する色合成プリズム４と、光源としてのランプ５の白色光を色分離する数種類のダイクロイックミラー等の光学部品を含み、各液晶パネル３（３Ｒ、３Ｇ、３Ｂ）の入射面にそれぞれに対応した色の光を導く照明光学手段としての照明光学装置６とを備えている。
【００１０】
上記構成により、ランプ５からの白色光は、照明光学装置６の複数の光学素子により赤、緑、青の光束に分離され、それぞれ液晶パネル３Ｒ、３Ｇ、３Ｂに入射して映像信号に応じて画素毎に変調され、それにより赤、緑、青に対応した画像が表示される。これら液晶パネル３Ｒ、３Ｇ、３Ｂのそれぞれで変調を受け透過したそれぞれの色の光束が、色合成プリズム４に入射して合成され、投写レンズ１方向の面から出射される。この色合成プリズムからの出射光が投写レンズ１に取り込まれ、液晶パネル３Ｒ、３Ｇ、３Ｂからの画像の合成画像が装置外のスクリーンに拡大投影される。
【００１１】
詳細には、投写型表示装置においては、図２に示すように、液晶パネル３Ｒ、３Ｇ、３Ｂは色合成プリズム４に対して正確に位置決めされ、固定されている。投写レンズマウント２も、色合成プリズム４に対して正確に位置決めされ、固定されており、同心状に内部に配置された投写レンズ１を図中のＸ方向、Ｙ方向、Ｚ方向のそれぞれに移動調整（レンズシフトおよびフォーカス移動）する図示しない機構を有している。
【００１２】
色合成プリズム４に対する投写レンズ１の傾き調整機構は、投写レンズ１のフランジ７と、投写レンズマウント２の端部外周に鍔状に形成された投写レンズ取り付け部８と、投写レンズ１のフランジ面に一方の面が当接するように投写レンズ１のフランジ７と投写レンズマウント２の投写レンズ取り付け部８との間に配された、投写レンズ取り付け部材としての板状かつリング状の調整板９と、これらの取り付け、調整を行うねじ、板ばね等の付勢手段など、光軸中心に対して１２０°間隔で３組配置された部品とで構成されている。
【００１３】
１組の上記部品が配置された上部構造を示す図３を参照しながら、更に詳細に説明する。
投写レンズマウント２の投写レンズ取り付け部８は、調整板９に対向する一側が調整板９を受け入れ可能に凹状をなし、調整板９に背反する他側の内周部が軸心方向に沿って突出しており、この突出部分の外周に板ばね１０が取り付けられている。
【００１４】
そして、投写レンズ１のフランジ７と調整板９と投写レンズ取り付け部８とにそれぞれ貫通穴７ａ，９ａ，８ａが同軸状に形成され、その内の貫通穴８ａがねじ穴として形成されている。調整板９の貫通穴９ａは、投写レンズ取り付け部８に対向する端部内面がコーン状当たり面９a1として形成され、このコーン状当たり面９a1に頭部が当接する調節ねじ１１がねじ穴８ａに螺合して配置されていて、貫通穴７ａ，９ａに挿通される工具により調節ねじ１１が回転して出退自在である。
【００１５】
また、貫通穴７ａ，９ａよりも外周側の調整板９と投写レンズ取り付け部８とにそれぞれ貫通穴９ｂ，８ｂが同軸状に形成され、これらの貫通穴９ｂ，８ｂと同軸状をなすねじ穴１０ｂが板ばね１０に形成されている。調整板９の貫通穴９ｂは、フランジ７に対向する端部が開いた漏斗状に形成され、この漏斗状の貫通穴９ｂに頭部が嵌入する皿ねじ１２が貫通穴９ｂ，８ｂに挿通され、板ばね１０のねじ穴１０ｂに螺合されていて、それにより、調整板９が投写レンズ取り付け部８の方向に付勢されている。
【００１６】
投写レンズ１のフランジ７，調整板９，投写レンズマウント２の投写レンズ取り付け部８にはそれぞれ、３組の取り付け穴７ｃ，９ｃ，８ｃが形成され、これらに螺合する取り付けねじ１３が配置されていて、それにより、投写レンズ１は投写レンズマウント２に対して、調整板９が介在する状態で保持されている。
【００１７】
このような構成を有するため、検査時に、調整板９のねじ当たり面９a1に頭部が接触している調整ねじ１１の締め付け具合もしくは緩め具合を貫通穴７ａ，９ａに工具を通して調整することで、各調整ねじ１１の位置で独立に、投写レンズ取り付け部８に対する調整板９の距離を任意に調整でき、それにより各調整ねじ１１の位置（ここでは３ヶ所）での投写レンズ取り付け部８との距離で決まる調整板９の傾きを微調整できる。その結果、調整板９に対して密着状態に有る投写レンズ１のフランジ７の傾き、したがって投写レンズ１の傾きを微調整できる。
【００１８】
そして、このようにして投写レンズ１の傾きを微調整できるため、投写レンズ１の光軸を液晶パネル３Ｒ、３Ｇ、３Ｂや色合成プリズム４の入出射面に対して正確に直交させることが可能になる。よって、このように微調整した状態で、投写レンズ１を投写レンズマウント２に対して取り付けねじ１３によって固定しておくことで、画質の良好な映像を得ることが可能となる。
【００１９】
図４に示すように、この投写型表示装置は、投写レンズ１と、投写レンズマウント２と、ライトバルブとしての液晶パネル３（３Ｒ、３Ｇ、３Ｂ）と、色合成プリズム４と、光源としてのランプ５と、照明光学装置６とを備えている。
【００２０】
図５に示すように、液晶パネル３Ｒ、３Ｇ、３Ｂは色合成プリズム４に対して正確に位置決めされ、固定されている。投写レンズマウント２も、色合成プリズム４に対して正確に位置決めされ、固定されており、同心状に内部に配置された投写レンズ１を図中のＸ方向、Ｙ方向、Ｚ方向のそれぞれに移動調整（レンズシフトおよびフォーカス移動）する図示しない機構を有している。
【００２１】
色合成プリズム４に対する投写レンズ１の傾き調整機構は、投写レンズ１のフランジ７と、投写レンズマウント２の端部近傍の外周に鍔状に形成された投写レンズ取り付け部８と、投写レンズマウント２の端部の外周に一体に構成され、フランジ７と投写レンズ取り付け部８との間に配された板状かつリング状の調整板９と、これらの取り付け、調整を行うねじ、板ばね等の付勢手段など、光軸中心に対して１２０°間隔で３組配置された部品とで構成されている。
【００２２】
１組の上記部品が配置された上部構造を示す図６を参照しながら、更に詳細に説明する。
調整板９は、投写レンズ１のフランジ７に対向する一側は投写レンズマウント２の端部と面一をなし、投写レンズ取り付け部８に対向する他側の内周部が軸心方向に沿って突出しており、この突出部分の外周に板ばね１０が取り付けられている。
【００２３】
そして、投写レンズ１のフランジ７と調整板９と投写レンズ取り付け部８とにそれぞれ貫通穴７ａ，９ａ，８ａが同軸状に形成され、その内の貫通穴９ａがねじ穴として形成されている。フランジ７の貫通穴７ａは、調整板９に対向する端部内面がコーン状当たり面７a1として形成され、このコーン状当たり面７a1に頭部が当接する調節ねじ１１がねじ穴９ａに螺合して配置されていて、貫通穴７ａに挿通される工具により調節ねじ１１が回転して出退自在である。
【００２４】
また、貫通穴７ａ，９ａよりも外周側のフランジ７と調整板９の薄肉部分とにそれぞれ貫通穴７ｂ，９ｂが同軸状に形成され、これらの貫通穴７ｂ，９ｂと同軸状をなすねじ穴１０ｂが板ばね１０に形成されている。そして、ねじ１２Ａが貫通穴７ｂ，９ｂに挿通され、板ばね１０のねじ穴１０ｂに螺合されていて、それにより、フランジ７が調整板９の方向に付勢されている。
【００２５】
投写レンズ１のフランジ７，調整板９，投写レンズマウント２の投写レンズ取り付け部８にはそれぞれ、３組の取り付け穴７ｃ，９ｃ，８ｃが形成され、これらに螺合する取り付けねじ１３が配置されていて、それにより、投写レンズ１は投写レンズマウント２に対して、調整板９が介在する状態で保持されている。
【００２６】
このような構成を有するため、検査時に、フランジ７のねじ当たり面７a1に頭部が接触している各調整ねじ１１の締め付け具合もしくは緩め具合を貫通穴７ａに工具を通して調整することで、各調整ねじ１１の位置で独立に、フランジ７に対する調整板９の距離を任意に調整でき、それにより各調整ねじ１１の位置（ここでは３ヶ所）で、フランジ７と調整板９との間の角度を微調整できる。その結果、調整板９と一体構造をなす投写レンズマウント２に対する投写レンズ１の傾きを微調整できる。
【００２７】
そして、このようにして投写レンズ１の傾きを微調整できるため、投写レンズ１の光軸を液晶パネル３Ｒ、３Ｇ、３Ｂや色合成プリズム４の入出射面に対して正確に直交させることが可能になる。よって、このように微調整した状態で、投写レンズ１を投写レンズマウント２に対して取り付けねじ１３によって固定しておくことで、画質の良好な映像を得ることが可能となる。
【００２８】
なお、上記した実施の形態１，２では、パネル状のライトバルブとして３枚の液晶パネル３Ｒ、３Ｇ、３Ｂを用い、これらの液晶パネル３Ｒ、３Ｇ、３Ｂに白色光を予め赤、緑、青に色分離して導き、液晶パネル３Ｒ、３Ｇ、３Ｂからの出射後に再合成する例を示したが、液晶パネルを１枚使用するタイプの投写型表示装置にも、同様にして上記した傾き調整機構を応用可能である。パネル状のライトバルブにミラーアレイ素子を１枚、もしくは複数枚使用するタイプの投写型表示装置に上記した傾き調整機構を応用しても、同様の効果が得られる。
【００２９】
【発明の効果】
以上のように本発明によれば、従来の投写レンズシフト機構を僅かに変更することで、この投写レンズシフト機構全体を移動させることなく、パネル状のライトバルブや色分離・合成に使用するプリズムの入出射面に対する投写レンズの光軸を調整することが可能になり、それにより、光学部品や機構部品の精度のバラツキを吸収して、良好な光学性能を発揮することが可能となる。よって、装置構成の複雑化、装置の大型化、コストアップを回避できる。
【図面の簡単な説明】
【図１】本発明の実施の形態１における投写型表示装置の概略全体構成を示す平面図
【図２】図１の投写型表示装置の投写レンズ取り付け部分の分解斜視図
【図３】図１の投写型表示装置の投写レンズ取り付け部分の一部拡大断面図
【図４】本発明の実施の形態２における投写型表示装置の概略全体構成を示す平面図
【図５】図４の投写型表示装置の投写レンズ取り付け部分の分解斜視図
【図６】図４の投写型表示装置の投写レンズ取り付け部分の一部拡大断面図
【符号の説明】
１投写レンズ
２投写レンズマウント
3R,3G,3B 液晶パネル
４色合成プリズム
５ランプ
６照明光学装置
７フランジ
８投写レンズ取り付け部
９調整板
7a,8a,9a 貫通穴
7c,8c,9c 取り付け穴
９a1 ねじ当たり面
10 板ばね
11 調整ねじ
12 皿ねじ
13 取り付けねじ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a projection display device that irradiates a light beam from a light source onto a panel-like light valve that can be modulated for each pixel according to information, and enlarges and projects an image of the light valve onto a screen outside the device using a projection lens. Is.
[0002]
[Prior art]
A conventional projection display device using a liquid crystal panel or a mirror array element as a light valve is known. In a projection display device using three liquid crystal panels and mirror array elements (hereinafter referred to as light valves), the transmitted light or reflected light modulated for each pixel by the three light valves is recombined and guided to the projection lens. It is common to use prisms for this purpose, and the optical axis of the projection lens should be accurately orthogonal to the panel light valve and the entrance / exit surface of the prism so that the image quality of the projected image is not impaired. Is necessary. Large projection display devices with high brightness have a projection lens shift mechanism that finely adjusts the projected image position by moving the projection lens up and down and left and right relative to the panel light valve. A method of adjusting the tilt of the optical axis of the projection lens by moving the entire mechanism is adopted.
[0003]
[Problems to be solved by the invention]
However, this type of projection display device is required to have high brightness, high image quality, high functionality, and a small set size. As in the past, the optical axis of the projection lens is a panel light valve. If the entire projection lens shift mechanism is moved so as to be orthogonal to the incident / exit surface of the prism, the configuration of the entire apparatus becomes complicated, leading to problems such as an increase in cost and an increase in the size of the apparatus.
[0004]
SUMMARY OF THE INVENTION An object of the present invention is to provide a projection display device that can adjust the tilt of a projection lens without moving the entire projection lens shift mechanism and obtain high image quality.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the invention described in claim 1 is a panel-like light valve that is composed of a plurality of pixels and can be modulated for each pixel according to information, and irradiates the light valve with a light beam from a light source. Projection-type display device having illumination optical means, a projection lens for enlarging and projecting the image of the light valve on a screen, and a projection lens mount having the projection lens and a plurality of screw holes and a plurality of mounting holes In the projection lens mount, a flange of the projection lens in which a plurality of attachment holes for attachment to the projection lens mount are formed, an adjustment plate disposed between the projection lens mount and the flange, and the projection lens mount attached to the projection lens mount. Adjustment plate urging means for urging the adjustment plate in the direction of the lens mount, and a plurality of screws that are screwed into the screw holes of the projection lens mount An adjustment screw, a plurality of adjustment plate attachment members that engage with the adjustment plate and the adjustment plate urging means, an attachment hole of the flange and an attachment hole of the projection lens mount, and the projection lens mounted on the projection lens mount A plurality of projection lens mounting screws that hold the adjustment plate in an interposed state, and the adjustment plate includes a screw contact surface that abuts the head of the adjustment screw on the projection lens flange side, and A through hole into which a tool for adjusting the adjusting screw is inserted and a through hole into which the adjusting plate mounting member is engaged are configured.
[0006]
According to a second aspect of the present invention, there is provided a panel-like light valve that is composed of a plurality of pixels and can be modulated for each pixel according to information, illumination optical means for irradiating the light valve with a light beam from a light source, and the light valve a plurality of attachment of a projection lens, the projection display device and a projection lens mount having a plurality of mounting holes and mounting the projection lens, for attachment to the projection lens mount for enlarging and projecting the image on a screen A flange of the projection lens in which a hole is formed , an adjustment plate having a plurality of screw holes disposed between the projection lens mount and the flange, and the flange attached to the adjustment plate in the direction of the lens mount. Adjusting plate biasing means for biasing, a plurality of adjusting screws screwed into screw holes of the adjusting plate, the flange and the adjusting plate biasing hand A plurality of adjustment plate attachment members that engage with the projection lens mount, and a plurality of adjustment plate attachment members that are disposed in the attachment holes of the flange and the projection lens mount and hold the projection lens with the adjustment plate interposed with respect to the projection lens mount. A projection lens mounting screw, and the flange includes a through hole into which a tool for adjusting the adjustment screw is inserted, a through hole with which the adjustment plate mounting member is engaged, and the adjustment plate side on the adjustment plate side. The adjustment screw has a screw contact surface with which the head of the adjustment screw abuts .
[0007]
According to each configuration described above, the inclination of the projection lens can be adjusted by slightly changing the mounting portion of the projection lens and adding components, and high image quality can be obtained.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(Embodiment 1)
1 is a perspective view showing a schematic overall configuration of a projection display apparatus according to Embodiment 1 of the present invention, FIG. 2 is an exploded perspective view of a projection lens mounting portion of the projection display apparatus, and FIG. 3 is the projection display apparatus. It is a partially expanded sectional view of the projection lens attachment part of FIG.
[0009]
As shown in FIG. 1, the projection display apparatus includes a projection lens 1 for enlarging and projecting an image on a screen outside the apparatus, and a projection that can adjust the shift of the optical axis shift and the focus direction by mounting the projection lens 1. The lens mount 2, the liquid crystal panel 3 (3R, 3G, 3B) as a light valve capable of modulating light transmission or shading for each pixel according to information, and these liquid crystal panels 3 (3R, 3G, 3B) ), And recombines the light transmitted through the projection lens 1 in the direction of the projection lens 1, and optical components such as several types of dichroic mirrors that separate the white light of the lamp 5 as the light source. 3R, 3G, and 3B) are provided with illumination optical devices 6 as illumination optical means for guiding light of colors corresponding to the respective entrance surfaces.
[0010]
With the above configuration, the white light from the lamp 5 is separated into red, green, and blue light beams by the plurality of optical elements of the illumination optical device 6, and is incident on the liquid crystal panels 3R, 3G, and 3B, respectively, according to the video signal. Modulation is performed for each pixel, whereby an image corresponding to red, green, and blue is displayed. The light beams of the respective colors modulated and transmitted by the liquid crystal panels 3R, 3G, and 3B are incident on the color combining prism 4 and combined, and are emitted from the surface in the direction of the projection lens 1. Light emitted from the color synthesis prism is taken into the projection lens 1, and a synthesized image of the images from the liquid crystal panels 3R, 3G, and 3B is enlarged and projected onto a screen outside the apparatus.
[0011]
Specifically, in the projection display apparatus, as shown in FIG. 2, the liquid crystal panels 3R, 3G, and 3B are accurately positioned and fixed with respect to the color combining prism 4. The projection lens mount 2 is also accurately positioned and fixed with respect to the color combining prism 4, and the projection lens 1 arranged concentrically inside is moved in each of the X direction, Y direction, and Z direction in the figure. A mechanism (not shown) for adjusting (lens shift and focus movement) is provided.
[0012]
The tilt adjustment mechanism of the projection lens 1 with respect to the color synthesis prism 4 includes a flange 7 of the projection lens 1, a projection lens mounting portion 8 formed in a bowl shape on the outer periphery of the projection lens mount 2, and a flange surface of the projection lens 1. one surface is disposed between the projection shooting lens mounting portion 8 of the flange 7 of the projection lens 1 so as to abut the projection lens mount 2, plate-shaped and ring-shaped adjustment plate 9 as a projection lens mounting member And three sets of parts arranged at 120 ° intervals with respect to the center of the optical axis, such as an urging means such as a screw and a leaf spring for mounting and adjusting these.
[0013]
This will be described in more detail with reference to FIG. 3 showing the superstructure in which a set of the above-mentioned parts is arranged.
Projecting shooting lens mounting portion 8 of the projection lens mount 2, without one side facing the adjusting plate 9 is a concave shape capable of receiving the adjusting plate 9, the inner peripheral portion of the other side of contradictory adjustment plate 9 along the axial direction The leaf spring 10 is attached to the outer periphery of the protruding portion.
[0014]
Through holes 7a, 9a, and 8a are coaxially formed in the flange 7, the adjustment plate 9, and the projection lens mounting portion 8 of the projection lens 1, and the through holes 8a therein are formed as screw holes. The through hole 9a of the adjustment plate 9 is formed such that the inner surface of the end facing the projection lens mounting portion 8 is formed as a cone-shaped contact surface 9a1, and the adjustment screw 11 whose head abuts against the cone-shaped contact surface 9a1 is formed in the screw hole 8a. The adjusting screw 11 is rotated by a tool inserted through the through-holes 7a and 9a and can be moved out and out.
[0015]
Further, through holes 9b and 8b are formed coaxially in the adjustment plate 9 and the projection lens mounting portion 8 on the outer peripheral side of the through holes 7a and 9a, respectively, and screws that are coaxial with the through holes 9b and 8b. A hole 10 b is formed in the leaf spring 10. The through hole 9b of the adjusting plate 9 is formed in a funnel shape having an open end facing the flange 7, and a countersunk screw 12 whose head is fitted into the funnel-shaped through hole 9b is inserted into the through holes 9b and 8b. The adjusting plate 9 is urged in the direction of the projection lens mounting portion 8 by being screwed into the screw hole 10 b of the leaf spring 10.
[0016]
Flange 7 of the projection lens 1, adjusting plate 9, each of the projection lens attachment portion 8 of the projection lens mount 2, three sets of mounting holes 7c, 9c, 8c are formed, the mounting screw 13 is arranged to be screwed thereto It has been, thereby, the projection lens 1 with respect to the projection lens mount 2, the adjustment plate 9 is held in a condition mediated.
[0017]
Since it has such a configuration, by adjusting the tightening or loosening of the adjusting screw 11 whose head is in contact with the screw contact surface 9a1 of the adjusting plate 9 through a tool through the through holes 7a and 9a at the time of inspection, The distance of the adjustment plate 9 with respect to the projection lens mounting portion 8 can be arbitrarily adjusted independently at the position of each adjustment screw 11, whereby the projection lens mounting portion 8 at the position of each adjustment screw 11 (here, three locations) can be adjusted. The inclination of the adjustment plate 9 determined by the distance can be finely adjusted. As a result, it is possible to finely adjust the inclination of the flange 7 of the projection lens 1 that is in close contact with the adjustment plate 9, and thus the inclination of the projection lens 1.
[0018]
Since the inclination of the projection lens 1 can be finely adjusted in this way, the optical axis of the projection lens 1 can be accurately orthogonal to the incident / exit surfaces of the liquid crystal panels 3R, 3G, 3B and the color synthesis prism 4. become. Thus, in this manner while the fine adjustment, by keeping fixed by attachment screws 13 to the projection lens 1 with respect to the projection lens mount 2, it is possible to obtain a good image quality.
[0019]
As shown in FIG. 4, the projection display device includes a projection lens 1, a projection lens mount 2, a liquid crystal panel 3 (3R, 3G, 3B) as a light valve, a color synthesis prism 4, and a light source. A lamp 5 and an illumination optical device 6 are provided.
[0020]
As shown in FIG. 5, the liquid crystal panels 3R, 3G, and 3B are accurately positioned and fixed with respect to the color synthesis prism 4. The projection lens mount 2 is also accurately positioned and fixed with respect to the color combining prism 4, and the projection lens 1 arranged concentrically inside is moved in each of the X direction, Y direction, and Z direction in the figure. A mechanism (not shown) for adjusting (lens shift and focus movement) is provided.
[0021]
Inclination adjustment mechanism of the projection lens 1 with respect to the color combining prism 4, the flange 7 of the projection lens 1, the light projecting shooting lens attachment portion 8 formed like a flange on the outer periphery of the end portion of the projection lens mount 2, a projection lens mount screws performing formed integrally on the outer periphery of the second end, a plate-shaped and ring-shaped adjustment plate 9 disposed between the flange 7 and the projection shooting lens mounting 8, these mounting and adjustment, the leaf spring 3 parts arranged at intervals of 120 ° with respect to the center of the optical axis, such as an urging means.
[0022]
This will be described in more detail with reference to FIG. 6 showing an upper structure in which a set of the above-mentioned parts is arranged.
Adjusting plate 9, one side facing the flange 7 of the projection lens 1 forms an end flush of the projection lens mount 2, the inner peripheral portion of the other side facing the projecting shooting lens mounting portion 8 in the axial direction The leaf spring 10 is attached to the outer periphery of the protruding portion.
[0023]
Through holes 7a, 9a, 8a are formed coaxially in the flange 7, adjustment plate 9 and projection lens mounting portion 8 of the projection lens 1, and the through holes 9a are formed as screw holes. In the through hole 7a of the flange 7, the inner surface of the end facing the adjustment plate 9 is formed as a cone-shaped contact surface 7a1, and the adjustment screw 11 whose head abuts against the cone-shaped contact surface 7a1 is screwed into the screw hole 9a. The adjusting screw 11 is rotated by a tool inserted through the through hole 7a and can be moved out and out.
[0024]
Further, through holes 7b and 9b are formed coaxially in the flange 7 on the outer peripheral side of the through holes 7a and 9a and the thin portion of the adjusting plate 9, respectively, and screws that are coaxial with these through holes 7b and 9b. A hole 10 b is formed in the leaf spring 10. Then, the screw 12A is inserted into the through holes 7b and 9b and screwed into the screw hole 10b of the leaf spring 10, whereby the flange 7 is biased in the direction of the adjustment plate 9 .
[0025]
Flange 7 of the projection lens 1, adjusting plate 9, each of the projection lens attachment portion 8 of the projection lens mount 2, three sets of mounting holes 7c, 9c, 8c are formed, the mounting screw 13 is arranged to be screwed thereto It has been, thereby, the projection lens 1 with respect to the projection lens mount 2, the adjustment plate 9 is held in a condition mediated.
[0026]
Since it has such a configuration, at the time of inspection, each adjustment screw 11 is adjusted by adjusting the tightening or loosening degree of each adjusting screw 11 whose head is in contact with the screw contact surface 7a1 of the flange 7 through the through hole 7a. The distance of the adjusting plate 9 to the flange 7 can be arbitrarily adjusted independently at the position of the screw 11, whereby the angle between the flange 7 and the adjusting plate 9 can be adjusted at the position of each adjusting screw 11 (here, three locations). Fine adjustment. As a result, it is possible to finely adjust the inclination of the projection lens 1 with respect to the projection lens mount 2 having an integral structure with the adjustment plate 9.
[0027]
Since the inclination of the projection lens 1 can be finely adjusted in this way, the optical axis of the projection lens 1 can be accurately orthogonal to the incident / exit surfaces of the liquid crystal panels 3R, 3G, 3B and the color synthesis prism 4. become. Thus, in this manner while the fine adjustment, by keeping fixed by attachment screws 13 to the projection lens 1 with respect to the projection lens mount 2, it is possible to obtain a good image quality.
[0028]
In the first and second embodiments described above, three liquid crystal panels 3R, 3G, and 3B are used as panel-like light valves, and white light is applied to these liquid crystal panels 3R, 3G, and 3B in advance in red, green, and blue. In this example, the color separation is performed separately and recombined after emission from the liquid crystal panels 3R, 3G, and 3B. However, the tilt adjustment described above is similarly applied to a projection display device that uses one liquid crystal panel. The mechanism can be applied. The same effect can be obtained by applying the tilt adjustment mechanism described above to a projection type display device that uses one or more mirror array elements in a panel-like light valve.
[0029]
【The invention's effect】
As described above, according to the present invention, the conventional projection lens shift mechanism is slightly changed, so that the projection lens shift mechanism is not moved and the panel-shaped light valve or the prism used for color separation / combination is used. It is possible to adjust the optical axis of the projection lens with respect to the light incident / exit surface, thereby absorbing variations in the accuracy of optical components and mechanical components and exhibiting good optical performance. Therefore, it is possible to avoid complication of the device configuration, enlargement of the device, and cost increase.
[Brief description of the drawings]
FIG. 1 is a plan view showing a schematic overall configuration of a projection display apparatus according to Embodiment 1 of the present invention. FIG. 2 is an exploded perspective view of a projection lens mounting portion of the projection display apparatus of FIG. FIG. 4 is a partially enlarged cross-sectional view of a projection lens mounting portion of the projection display apparatus of FIG. 4. FIG. 4 is a plan view showing a schematic overall configuration of the projection display apparatus in Embodiment 2 of the present invention. FIG. 6 is an exploded perspective view of the projection lens mounting portion of the apparatus. FIG. 6 is a partially enlarged cross-sectional view of the projection lens mounting portion of the projection display apparatus of FIG.
1 Projection lens 2 Projection lens mount
3R, 3G, 3B LCD panel 4 Color composition prism 5 Lamp 6 Illumination optical device 7 Flange 8 Projection lens mounting part 9 Adjustment plate
7a, 8a, 9a Through hole
7c, 8c, 9c Mounting hole 9a1 Screw contact surface
10 leaf spring
11 Adjustment screw
12 Countersunk screw
13 Mounting screw

Claims

A panel-like light valve composed of a plurality of pixels, which can be modulated for each pixel according to information, illumination optical means for irradiating the light valve with a light beam from a light source, and an image of the light valve being enlarged and projected onto a screen A projection display device comprising: a projection lens for mounting; and a projection lens mount mounted with the projection lens and having a plurality of screw holes and a plurality of mounting holes .
A flange of the projection lens in which a plurality of attachment holes for attachment to the projection lens mount are formed;
An adjustment plate disposed between the projection lens mount and the flange;
Adjustment plate urging means attached to the projection lens mount and urging the adjustment plate in the direction of the lens mount;
A plurality of adjustment screws screwed into the screw holes of the projection lens mount;
A plurality of adjustment plate attachment members that engage with the adjustment plate and the adjustment plate urging means;
A plurality of projection lens mounting screws disposed in the mounting holes of the flange and the mounting hole of the projection lens mount and holding the projection lens in a state where the adjusting plate is interposed with respect to the projection lens mount;
With
The adjustment plate includes a through hole into which a tool for adjusting the adjustment screw is inserted, a through hole with which the adjustment plate mounting member is engaged, and a head of the adjustment screw on the side facing the projection lens mount. A projection display device , comprising: a screw contact surface that abuts .

A panel-like light valve composed of a plurality of pixels, which can be modulated for each pixel according to information, illumination optical means for irradiating the light valve with a light beam from a light source, and an image of the light valve being enlarged and projected onto a screen A projection display device having a projection lens for mounting and a projection lens mount having the projection lens and a plurality of mounting holes ,
A flange of the projection lens in which a plurality of attachment holes for attachment to the projection lens mount are formed;
An adjustment plate disposed between the projection lens mount and the flange and having a plurality of screw holes;
Adjustment plate urging means attached to the adjustment plate and urging the flange toward the lens mount;
A plurality of adjusting screws screwed into the screw holes of the adjusting plate;
A plurality of adjustment plate attachment members that engage with the flange and the adjustment plate biasing means;
A plurality of projection lens mounting screws disposed in the mounting holes of the flange and the mounting hole of the projection lens mount and holding the projection lens in a state where the adjusting plate is interposed with respect to the projection lens mount;
With
The flange includes a through hole into which a tool for adjusting the adjustment screw is inserted, a through hole with which the adjustment plate mounting member is engaged, and a head of the adjustment screw abutting on a side facing the adjustment plate. A projection display device having a screw contact surface .