JPS62294230A - Projector - Google Patents
ProjectorInfo
- Publication number
- JPS62294230A JPS62294230A JP61137805A JP13780586A JPS62294230A JP S62294230 A JPS62294230 A JP S62294230A JP 61137805 A JP61137805 A JP 61137805A JP 13780586 A JP13780586 A JP 13780586A JP S62294230 A JPS62294230 A JP S62294230A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- panel
- center
- crystal panel
- lens
- 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.)
- Pending
Links
- 238000001816 cooling Methods 0.000 claims abstract description 21
- 238000003384 imaging method Methods 0.000 claims description 11
- 239000004973 liquid crystal related substance Substances 0.000 abstract description 30
- 238000009826 distribution Methods 0.000 abstract description 6
- 239000000758 substrate Substances 0.000 abstract description 6
- 230000002093 peripheral effect Effects 0.000 abstract description 4
- 230000003287 optical effect Effects 0.000 abstract description 3
- 230000005540 biological transmission Effects 0.000 description 4
- 238000005286 illumination Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000004990 Smectic liquid crystal Substances 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
Landscapes
- Overhead Projectors And Projection Screens (AREA)
- Liquid Crystal (AREA)
- Projection Apparatus (AREA)
Abstract
Description
【発明の詳細な説明】 3、発明の詳細な説明 産業上の利用分野 この発明は、投影装置に関する。[Detailed description of the invention] 3. Detailed description of the invention Industrial applications The present invention relates to a projection device.
従来の技術
従来、第5図及び第6図に示すように、透過型液晶パネ
ルに表示された画像を拡大してスクリーンに投影する投
影装置が存する。2. Description of the Related Art Conventionally, as shown in FIGS. 5 and 6, there has been a projection device that enlarges an image displayed on a transmissive liquid crystal panel and projects it onto a screen.
第5図は実開昭60−96680号公報に記載された考
案で、光源51の光線を透過型の液晶パネル52に透過
し、レンズ53からスクリーン54に投影するものであ
る。第6図は特開昭59−19924号公報に記載され
た発明で、光源55の光線を防熱ガラス56とフレネル
レンズ57とガラスステージ58上の透過型液晶パネル
59とを透過し、映像転向ミラー60によりスクリーン
61に投影するものである。FIG. 5 shows a device described in Japanese Utility Model Application Publication No. 60-96680, in which light from a light source 51 is transmitted through a transmissive liquid crystal panel 52 and projected onto a screen 54 through a lens 53. FIG. 6 shows the invention described in Japanese Patent Application Laid-Open No. 59-19924, in which the light beam from a light source 55 is transmitted through a heat-insulating glass 56, a Fresnel lens 57, and a transmission type liquid crystal panel 59 on a glass stage 58, and an image turning mirror is used. 60 to project the image onto a screen 61.
また、反射型投影装置としては第7図に示すものが存す
る。これは液晶パネル62に光源63の光線を照射し、
液晶パネル62の背面の反射面で反射した光を結像レン
ズにより集光して投影するものである。Further, as a reflection type projection apparatus, there is one shown in FIG. This irradiates the liquid crystal panel 62 with the light beam of the light source 63,
The light reflected by the reflective surface on the back surface of the liquid crystal panel 62 is condensed by an imaging lens and projected.
発明が解決しようとする問題点
しかし、第5図及び第6図に示した透過型液晶パネル5
2.59は画素数が少なく小型のため投影装置として使
用するには好ましくない。このことはスメクテイツク液
晶パネルを使用しても同様である。実用されるものに近
いものとしてTN液晶パネルが挙げられるが、これも偏
光板を二枚使用しているので相当の光量ロスがある。ま
た、第7図に示す反射型の投影装置では照明光が強く、
照明光の光軸中心程光量が高い。したがって、液晶パネ
ル62の中心程温度が上昇し、温度分布が不均一である
。したがって、同一画像を表示しても中央部と周辺部と
では表示状態が変化する。Problems to be Solved by the Invention However, the transmission type liquid crystal panel 5 shown in FIGS. 5 and 6
2.59 is not preferable for use as a projection device because it has a small number of pixels and is small. This is true even if a smectic liquid crystal panel is used. A TN liquid crystal panel is one that is close to that in practical use, but this also uses two polarizing plates, so there is a considerable amount of light loss. Furthermore, in the reflection type projection device shown in Fig. 7, the illumination light is strong;
The light intensity is higher toward the center of the optical axis of the illumination light. Therefore, the temperature increases toward the center of the liquid crystal panel 62, and the temperature distribution is non-uniform. Therefore, even if the same image is displayed, the display state changes between the central part and the peripheral part.
問題点を解決するための手段 前面に結像レンズが設けられた筐体の内部に。Means to solve problems Inside the casing, there is an imaging lens on the front.
前記結像レンズに所定の間隔を開けて離間して固定され
たパネルシートと、このパネルシートの前面に所定の間
隔を開けて離間して固定された光源と、前記パネルシー
トの前面又は背面に対面して固定された集光フレネルレ
ンズと、前記パネルシートの背面に位置して固定的に配
置された反射面とを設け、この反射面の背面に冷却装置
を設ける。A panel sheet fixed to the imaging lens at a predetermined interval, a light source fixed at a predetermined interval to the front of the panel sheet, and a light source fixed to the front of the panel sheet at a predetermined interval. A condensing Fresnel lens fixed to face each other and a reflective surface fixedly disposed on the back surface of the panel sheet are provided, and a cooling device is provided on the back surface of the reflective surface.
作用
したがって、光源によりパネルシートを照明し、パネル
シートに表示された画像を結像レンズから透過する。パ
ネルシートが光源から受ける熱は中心部が最も高く周辺
部に向かうに従い次第に低くなるが、冷却装置の冷却温
度と冷却分布とを制御することにより、パネルシートの
温度を均一にすることができ、これにより、どの位置に
おいても同一条件で画像を表示させることが可能となる
。Operation: Therefore, the panel sheet is illuminated by the light source, and the image displayed on the panel sheet is transmitted through the imaging lens. The heat that the panel sheet receives from the light source is highest at the center and gradually decreases toward the periphery, but by controlling the cooling temperature and cooling distribution of the cooling device, the temperature of the panel sheet can be made uniform. This makes it possible to display images under the same conditions at any position.
実施例
この発明の第一の実施例を第1図ないし第3図に基づい
て説明する。第3図に示すように、筐体1内には、パネ
ルシートであるスメクテイック型の液晶パネル2と、こ
の液晶パネル2の前面に所定の間隔を開けて対向する光
源3と、この光源3の光を拡散するコンデンサレンズ4
と、光源3がらの照明光中の熱線を吸収する熱線吸収フ
ィルタ5と、液晶パネル2の前面に対向する集光フレネ
ルレンズ6と、後方に位置する回路部7とが設けられ、
筐体1の前面には結像レンズ8が設けられている。Embodiment A first embodiment of the present invention will be described with reference to FIGS. 1 to 3. As shown in FIG. 3, inside the housing 1, there is a smectic type liquid crystal panel 2 which is a panel sheet, a light source 3 facing the front of the liquid crystal panel 2 at a predetermined distance, and a light source 3 that faces the front of the liquid crystal panel 2 at a predetermined distance. Condenser lens 4 that diffuses light
A heat ray absorption filter 5 that absorbs heat rays in the illumination light from the light source 3, a condensing Fresnel lens 6 facing the front of the liquid crystal panel 2, and a circuit section 7 located at the rear are provided.
An imaging lens 8 is provided on the front surface of the housing 1.
ついで、液晶パネル2の構成を第1図及び第2図に示す
。液晶9とこの液晶9を囲むスペーサ10とが透明基板
11.12により挾持されている。Next, the structure of the liquid crystal panel 2 is shown in FIGS. 1 and 2. A liquid crystal 9 and a spacer 10 surrounding the liquid crystal 9 are sandwiched between transparent substrates 11 and 12.
透明基板11.12の内面には多数の電極13゜14が
平行に形成されている。電極13.14は互いに直交す
る向きに配列されている。また、電極13は透明電極で
あるが電極14はアルミ等の金属板により形成されて反
射面を兼ねるものである。そして、一方の透明基板12
の背面には冷却装置である冷却パイプ15.16が設け
られている。これらの冷却パイプ15.16は渦巻状の
ものであるが、中心部から周辺部に向かうに従い次第に
密度が密から粗になるパターンをもって配置されている
。A large number of electrodes 13 and 14 are formed in parallel on the inner surface of the transparent substrates 11 and 12. The electrodes 13,14 are arranged in mutually orthogonal directions. Further, the electrode 13 is a transparent electrode, but the electrode 14 is formed of a metal plate such as aluminum and also serves as a reflective surface. Then, one transparent substrate 12
A cooling pipe 15, 16, which is a cooling device, is provided on the back side of the unit. These cooling pipes 15, 16 are spiral-shaped and are arranged in a pattern in which the density gradually increases from dense to coarse from the center toward the periphery.
このような構成において、電極13.14に電圧を印加
し、電極13.14が交叉する点に対応する部分の液晶
9を加熱することにより、液晶パネル2に所望の画像が
表示される。そして、光源3を点灯すると、その照明光
はコンデンサレンズ4により集光フレネルレンズ6の大
きさ一杯に拡散され、集光フレネルレンズ6により僅か
に集光されて液晶パネル2一杯に照射され、電極14に
より反射され、再び集光フレネルレンズ6により集光さ
れて結像レンズ8によりスクリーンに投影される。In such a configuration, a desired image is displayed on the liquid crystal panel 2 by applying a voltage to the electrodes 13.14 and heating the liquid crystal 9 at a portion corresponding to the point where the electrodes 13.14 intersect. When the light source 3 is turned on, the illumination light is diffused by the condenser lens 4 to the full size of the condensing Fresnel lens 6, is slightly condensed by the condensing Fresnel lens 6, and is irradiated to the full extent of the liquid crystal panel 2. 14, is again focused by a condensing Fresnel lens 6, and is projected onto a screen by an imaging lens 8.
このとき、光源3の光量は光軸中心が最も高いので、液
晶パネル2が受ける熱は中心が最も高く周辺部に向かう
に従い次第に低くなるが、冷却パイプ15,16の配列
密度は中央部が密で周辺部に向かうに従い相になるため
、同一温度の冷却水を冷却パイプ15.16に流すなら
ば、冷却作用は中心部が最も高く周辺部に向かうに従い
次第に低くなる。したがって、液晶パネル2を均一な温
度分布に保つことができ、これにより、中心部周辺部を
問わず同一条件で液晶パネル2の表示を行わせることが
できる。At this time, since the light intensity of the light source 3 is highest at the center of the optical axis, the heat received by the liquid crystal panel 2 is highest at the center and gradually decreases toward the periphery. Therefore, if cooling water of the same temperature is flowed through the cooling pipes 15 and 16, the cooling effect is highest at the center and gradually decreases toward the periphery. Therefore, the liquid crystal panel 2 can be maintained at a uniform temperature distribution, and thereby the liquid crystal panel 2 can display images under the same conditions regardless of the center and periphery.
なお、透明基板14の背面に複数に分割した冷却パイプ
を均一分布で配列しても良い。この場合、冷却パイプに
流す冷却水の温度を、中央部に位置する冷却パイプ程低
く周辺部に位置する冷却パイプ程高くすることにより、
同様の成果を得ることができる。Note that a plurality of divided cooling pipes may be arranged in a uniform distribution on the back surface of the transparent substrate 14. In this case, by making the temperature of the cooling water flowing through the cooling pipes lower in the central cooling pipes and higher in the peripheral cooling pipes,
Similar results can be obtained.
ついで、この発明の第二の実施例を第4図に基づいて説
明する。前記実施例と同一部分は同一符号を用い説明も
省略する。この実施例は、透明基板12の背面中央部に
冷却装置である複数のフィン17を形成したものである
。したがって、フィン17は液晶パネル2の中央部の熱
を主に放熱する。これにより、液晶パネル2が光源3か
ら受ける熱は中央部が高くなるが、液晶パネル2の全面
の温度を略均−化することができる。Next, a second embodiment of the present invention will be described based on FIG. 4. The same parts as in the previous embodiment are designated by the same reference numerals, and the description thereof will be omitted. In this embodiment, a plurality of fins 17 serving as a cooling device are formed at the center of the back surface of a transparent substrate 12. Therefore, the fins 17 mainly radiate heat from the center of the liquid crystal panel 2. As a result, although the heat received by the liquid crystal panel 2 from the light source 3 is higher at the center, the temperature of the entire surface of the liquid crystal panel 2 can be approximately equalized.
発明の効果
この発明は上述のように構成したので、光源によりパネ
ルシートを照明し、パネルシートに表示された画像を結
像レンズから透過するが、冷却装置の冷却温度と冷却分
布とを制御することによりパネルシートの温度を均一に
することができ、これにより、どの位置においても同一
条件で画像を表示させることができる効果を有する。Effects of the Invention Since the present invention is configured as described above, the panel sheet is illuminated by the light source and the image displayed on the panel sheet is transmitted through the imaging lens, but the cooling temperature and cooling distribution of the cooling device are controlled. This makes it possible to make the temperature of the panel sheet uniform, which has the effect of allowing images to be displayed under the same conditions at any position.
第1図ないし第3図はこの発明の第一の実施例を示すも
ので、第1図は液晶パネルの正面図、第2図はスペーサ
のみを断面にして示す液晶パネルの側面図、第3図は全
体構造を縮小して示す縦断側面図、第4図はこの発明の
第二の実施例を示すもので液晶パネルの正面図、第5図
は従来の透過型投影装置の一例を示す斜視図、第6図は
従来の透過型投影装置の他の例を示す側面図、第7図は
従来の反射型投影装置の原理を示す側面図である。1 to 3 show a first embodiment of the present invention, in which FIG. 1 is a front view of the liquid crystal panel, FIG. 2 is a side view of the liquid crystal panel showing only the spacer in cross section, and FIG. The figure is a vertical sectional side view showing the overall structure on a reduced scale, FIG. 4 is a front view of a liquid crystal panel showing a second embodiment of the invention, and FIG. 5 is a perspective view showing an example of a conventional transmission type projection device. FIG. 6 is a side view showing another example of a conventional transmission type projection device, and FIG. 7 is a side view showing the principle of a conventional reflection type projection device.
Claims (1)
レンズに所定の間隔を開けて離間して固定されたパネル
シートと、このパネルシートの前面に所定の間隔を開け
て離間して固定された光源と、前記パネルシートの前面
又は背面に対面して固定された集光フレネルレンズと、
前記パネルシートの背面に位置して固定的に配置された
反射面とを設け、この反射面の背面に冷却装置を設けた
ことを特徴とする投影装置。A panel sheet fixed to the imaging lens at a predetermined distance and spaced apart from the imaging lens inside a housing having an imaging lens provided on the front surface, and a panel sheet fixed to the imaging lens at a predetermined distance from each other in front of the panel sheet. a light source fixed to the panel sheet; a condensing Fresnel lens fixed to the front or rear surface of the panel sheet;
A projection device comprising: a reflective surface fixedly disposed on the back surface of the panel sheet; and a cooling device provided on the back surface of the reflective surface.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP61137805A JPS62294230A (en) | 1986-06-13 | 1986-06-13 | Projector |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP61137805A JPS62294230A (en) | 1986-06-13 | 1986-06-13 | Projector |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS62294230A true JPS62294230A (en) | 1987-12-21 |
Family
ID=15207262
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP61137805A Pending JPS62294230A (en) | 1986-06-13 | 1986-06-13 | Projector |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS62294230A (en) |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01159684A (en) * | 1987-12-17 | 1989-06-22 | Seiko Epson Corp | Projection display |
JPH01209482A (en) * | 1988-02-18 | 1989-08-23 | Kawasaki Heavy Ind Ltd | Liquid crystal image projecting mechanism |
US5170195A (en) * | 1990-09-17 | 1992-12-08 | Pioneer Electronic Corporation | Cooling device for a liquid crystal panel |
US5170194A (en) * | 1989-12-26 | 1992-12-08 | Canon Kabushiki Kaisha | Reflection type liquid crystal valve and projector having the same |
JPH06281905A (en) * | 1993-03-29 | 1994-10-07 | Nec Corp | Cooling mechanism for liquid crystal display pannel |
EP0757278A3 (en) * | 1995-06-07 | 1997-02-12 | Vari-Lite, Inc. | High intensity illuminating projector with reflective liquid crystal modulator |
US5691886A (en) * | 1991-04-30 | 1997-11-25 | Vari-Lite, Inc. | Programmable rotatable gobo system |
US6231191B1 (en) | 1997-10-20 | 2001-05-15 | Hitachi, Ltd. | Image display mechanism and image display device |
JP2002214703A (en) * | 2001-01-23 | 2002-07-31 | Sanyo Electric Co Ltd | Projection video display device |
US6769792B1 (en) | 1991-04-30 | 2004-08-03 | Genlyte Thomas Group Llc | High intensity lighting projectors |
JP2015022226A (en) * | 2013-07-22 | 2015-02-02 | 株式会社リコー | Image projection device |
-
1986
- 1986-06-13 JP JP61137805A patent/JPS62294230A/en active Pending
Cited By (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01159684A (en) * | 1987-12-17 | 1989-06-22 | Seiko Epson Corp | Projection display |
JPH01209482A (en) * | 1988-02-18 | 1989-08-23 | Kawasaki Heavy Ind Ltd | Liquid crystal image projecting mechanism |
US5170194A (en) * | 1989-12-26 | 1992-12-08 | Canon Kabushiki Kaisha | Reflection type liquid crystal valve and projector having the same |
US5170195A (en) * | 1990-09-17 | 1992-12-08 | Pioneer Electronic Corporation | Cooling device for a liquid crystal panel |
US6011640A (en) * | 1991-04-30 | 2000-01-04 | Vari-Lite, Inc. | High intensity lighting projectors |
US6769792B1 (en) | 1991-04-30 | 2004-08-03 | Genlyte Thomas Group Llc | High intensity lighting projectors |
US5691886A (en) * | 1991-04-30 | 1997-11-25 | Vari-Lite, Inc. | Programmable rotatable gobo system |
US5758956A (en) * | 1991-04-30 | 1998-06-02 | Vari-Lite, Inc. | High intensity lighting projectors |
US5829868A (en) * | 1991-04-30 | 1998-11-03 | Vari-Lite, Inc. | High intensity lighting projectors |
JPH06281905A (en) * | 1993-03-29 | 1994-10-07 | Nec Corp | Cooling mechanism for liquid crystal display pannel |
EP0757278A3 (en) * | 1995-06-07 | 1997-02-12 | Vari-Lite, Inc. | High intensity illuminating projector with reflective liquid crystal modulator |
US6231191B1 (en) | 1997-10-20 | 2001-05-15 | Hitachi, Ltd. | Image display mechanism and image display device |
US6588910B2 (en) | 1997-10-20 | 2003-07-08 | Hitachi, Ltd. | Image display mechanism and image display device |
US6682197B2 (en) | 1997-10-20 | 2004-01-27 | Hitachi, Ltd. | Image display mechanism and image display device |
US6817720B2 (en) | 1997-10-20 | 2004-11-16 | Hitachi, Ltd. | Image display mechanism and image display device |
US6908198B2 (en) | 1997-10-20 | 2005-06-21 | Hitachi, Ltd. | Image display mechanism and image display device |
JP2002214703A (en) * | 2001-01-23 | 2002-07-31 | Sanyo Electric Co Ltd | Projection video display device |
JP2015022226A (en) * | 2013-07-22 | 2015-02-02 | 株式会社リコー | Image projection device |
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