JPH05150190A - Linear polarized light conversion device - Google Patents
Linear polarized light conversion deviceInfo
- Publication number
- JPH05150190A JPH05150190A JP3341791A JP34179191A JPH05150190A JP H05150190 A JPH05150190 A JP H05150190A JP 3341791 A JP3341791 A JP 3341791A JP 34179191 A JP34179191 A JP 34179191A JP H05150190 A JPH05150190 A JP H05150190A
- Authority
- JP
- Japan
- Prior art keywords
- light
- wave
- polarized light
- optical fiber
- linearly polarized
- 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
Landscapes
- Liquid Crystal (AREA)
- Projection Apparatus (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、赤（Ｒ）、緑（Ｇ）、
青（Ｂ）別に設けた白黒液晶板の表示映像を加色混合し
て投射する液晶カラー投射型ディスプレイに適用して好
適な直線偏光変換装置に関するものである。The present invention relates to red (R), green (G),
The present invention relates to a linear polarization conversion device suitable for application to a liquid crystal color projection type display that mixes and displays a display image of a black and white liquid crystal plate provided separately for blue (B).
【０００２】[0002]
【従来の技術】近年、テレビジョンの大画面化指向が進
む中で、液晶テレビ・パネルの画像をスクリーンに拡大
投写する液晶方式の投射型ディスプレイが、小型、軽
量、取り扱いの容易さのために注目されている。しか
し、液晶投射型ディスプレイを、現在投射型ディスプレ
イの主流であり完成度が高いＣＲＴ（ブラウン管）画像
投写型ディスプレイと比較すると、解像度、明るさとも
未だ不満足で、改善の余地があった。2. Description of the Related Art In recent years, with the trend toward larger screens of televisions, a liquid crystal projection display for enlarging and projecting an image of a liquid crystal television panel on a screen is required for its small size, light weight and easy handling. Attention has been paid. However, when comparing the liquid crystal projection display with the CRT (cathode ray tube) image projection display, which is currently the mainstream of projection displays and has a high degree of perfection, the resolution and brightness are still unsatisfactory, and there is room for improvement.
【０００３】解像度に関しては、高精細液晶テレビ・パ
ネルの開発が進んでいる。明るさに関しては、画像形成
と光源を分離できる液晶投射型ディスプレイの方が有利
とされるが、標準的なＣＲＴ方式に比べて１／２〜１／
３程度で未だ及ばない。投射光束を増加させるための手
っ取り早い方法は高光出力ランプを使用することである
が、この場合は消費電力の増大、装置温度の上昇による
部品の劣化をもたらすため実用的でない。Regarding resolution, development of high-definition liquid crystal television panels is in progress. Regarding brightness, a liquid crystal projection display that can separate the image formation and the light source is more advantageous, but it is 1/2 to 1/1 compared to the standard CRT method.
It is still around 3 A quick way to increase the projected light flux is to use a high light output lamp, but this is not practical because it results in increased power consumption and component degradation due to increased device temperature.
【０００４】図５は光の色分離および混合にダイクロイ
ックミラーを用いたミラー方式と呼ばれる液晶カラー投
射型ディスプレイの従来例を示す模式図である。同図に
おいて、１はキセノンランプ等の光源であり、この光源
１から放射された光は、反射面が放物面で光源光を光軸
と平行な平行光にする反射鏡２で反射され、液晶板７、
１２、１５の直前に配置した不図示のコンデンサレンズ
によって投射光学系１９に向けて収束される。この時、
収束された平行光線は、青色光のみを分離反射する青ダ
イクロイックミラー４に入射する。青ダイクロイックミ
ラー４で分離された青色光５はミラー６で光源光軸と平
行に反射されて、透過型液晶パネル７に入射する。液晶
パネル７には投射すべき任意の映像の構成画素に応じて
選択的に電圧が供給されており、該液晶パネル７を透過
した青色光５は映像信号を有する青色映像光５ａとな
る。FIG. 5 is a schematic view showing a conventional example of a liquid crystal color projection type display called a mirror system using a dichroic mirror for color separation and mixing of light. In the figure, reference numeral 1 denotes a light source such as a xenon lamp, and the light emitted from the light source 1 is reflected by a reflecting mirror 2 which has a reflecting surface having a parabolic surface and which makes the light source light parallel light parallel to the optical axis. Liquid crystal plate 7,
A condenser lens (not shown) arranged immediately before the lenses 12 and 15 converges the light toward the projection optical system 19. At this time,
The converged parallel rays enter the blue dichroic mirror 4 that separates and reflects only the blue light. The blue light 5 separated by the blue dichroic mirror 4 is reflected by the mirror 6 in parallel with the optical axis of the light source and enters the transmissive liquid crystal panel 7. A voltage is selectively supplied to the liquid crystal panel 7 according to constituent pixels of an arbitrary image to be projected, and the blue light 5 transmitted through the liquid crystal panel 7 becomes a blue image light 5a having a video signal.
【０００５】青ダイクロイックミラー４で青色成分５を
失いそのミラー４を透過した光は黄色になる。その黄色
光８は赤ダイクロイックミラー９に入射し、赤色光１０
が分離され、残る緑色光１１はそのミラー９を透過す
る。分離された赤色光１０は前記液晶パネル７と同一構
成からなる透過型液晶パネル１２に入射し赤色映像光１
０ａとなる。青色映像光５ａと赤色映像光１０ａは混合
用ダイクロイックミラー１３で混合されてマゼンタ色映
像光１４となる。The blue dichroic mirror 4 loses the blue component 5 and the light transmitted through the mirror 4 becomes yellow. The yellow light 8 is incident on the red dichroic mirror 9, and the red light 10
Is separated, and the remaining green light 11 passes through the mirror 9. The separated red light 10 is incident on a transmissive liquid crystal panel 12 having the same structure as the liquid crystal panel 7, and the red image light 1
It becomes 0a. The blue image light 5a and the red image light 10a are mixed by the mixing dichroic mirror 13 to become magenta image light 14.
【０００６】一方、緑色光１１はやはり前記液晶パネル
７と同一構成の透過型液晶パネル１５に入射し、緑色映
像光１１ａとなり、ミラー１６で反射されて混合用ダイ
クロイックミラー１７に入射する。緑色映像光１１ａと
マゼンタ色映像光１４は混合用ダイクロイックミラー１
７で混合されて、ＲＧＢ加色混合映像光１８となり、投
射光学系１９を介して大型スクリーン２０に拡大投射さ
れて、カラー映像が再生される。On the other hand, the green light 11 also enters the transmission type liquid crystal panel 15 having the same structure as the liquid crystal panel 7, becomes green image light 11a, is reflected by the mirror 16 and enters the mixing dichroic mirror 17. The green image light 11a and the magenta color image light 14 are mixed with the dichroic mirror 1 for mixing.
7 is mixed and becomes the RGB additive color mixed image light 18, which is enlarged and projected onto the large screen 20 through the projection optical system 19 to reproduce a color image.
【０００７】図６は透過型液晶パネル７（液晶パネル１
２、１５も同様）の実際の構成（図４では省略）を示す
図で、両側に設けられた２枚の偏光板２１Ａ、２１Ｂを
備えている。その理由は、液晶パネル７に使用される液
晶（ツイステッド・ネマティック液晶）は、電圧の印加
状態によって光を透過したり、遮断したりするのではな
く、入射した光の偏光面を回転させるからである。すな
わち、偏光方向の定まっていない自然光を入射させる
と、電圧の印加状態に関係なく、自然光として出てくる
ため、液晶パネルに画像が形成されていても、認識する
ことはできない。そこで、まず液晶パネル７の前に偏光
板２１Ａを置き、自然光のうち一定方向の偏光の光だけ
を透過させて、直線偏光の光に変える。つまり、自然光
が偏光板２１Ａを透過すると、互いに直交する２つの直
線偏光の光に分解され、このうち、偏光方向に平行な成
分は透過し、直交する成分は吸収される。そして、偏光
方向に平行な直線偏光光を液晶パネル７に入射させる
と、画像に応じて部分的に偏光方向が回転し、液晶パネ
ル７から出る。ここで再度偏光板２１Ｂを用いて一定方
向の偏光の光だけを透過させると、初めて濃淡画像が得
られる。なお、偏光方向に直交する成分は偏光板２１Ａ
に吸収されると、熱に変換される。FIG. 6 shows a transmissive liquid crystal panel 7 (liquid crystal panel 1
2 and 15 are the same) (actual configuration is omitted in FIG. 4), and two polarizing plates 21A and 21B are provided on both sides. The reason is that the liquid crystal used in the liquid crystal panel 7 (twisted nematic liquid crystal) does not transmit or block light depending on the voltage application state, but rotates the polarization plane of incident light. is there. That is, when natural light of which the polarization direction is not determined is incident, it is emitted as natural light regardless of the voltage application state, and therefore, even if an image is formed on the liquid crystal panel, it cannot be recognized. Therefore, first, a polarizing plate 21A is placed in front of the liquid crystal panel 7, and only natural polarized light of a certain direction is transmitted and converted into linear polarized light. That is, when natural light passes through the polarizing plate 21A, it is decomposed into two linearly polarized lights that are orthogonal to each other, and of these, the components parallel to the polarization direction are transmitted and the orthogonal components are absorbed. Then, when linearly polarized light parallel to the polarization direction is incident on the liquid crystal panel 7, the polarization direction is partially rotated according to the image and exits from the liquid crystal panel 7. Here, when the polarizing plate 21B is used again to transmit only light polarized in a certain direction, a grayscale image is obtained. The component orthogonal to the polarization direction is the polarizing plate 21A.
When absorbed by, it is converted into heat.
【０００８】[0008]
【発明が解決しようとする課題】以上のことから明らか
なように、従来装置においては自然光から偏光板２１Ａ
で偏光した直線偏光光を取り出す段階で少なくとも半分
の光が偏光板２１Ａに吸収されるため、光の有効利用と
いう点で問題があった。また、吸収された光は熱に変換
され、偏光板２１Ａの温度を上昇させるため、偏光板２
１Ａを劣化させるという付随的な問題もあった。したが
って、自然光から偏光板２１Ａで一定方向の偏光成分だ
けを取り出すのではなく、光源からの全ての光を一定方
向に偏光した光に変換することができ、光量の増大化
と、熱による偏光板劣化の問題を解消し得る装置の開発
が要望されている。なお、２枚目の偏光板２１Ｂの劣化
の問題は、液晶パネル７の開口部分が全面積の４０％程
度（開口率の増大も液晶カラー投射型ディスプレイの高
輝度化の重要なファクタである）であるため、１枚目の
偏光板２１Ａほど大きな問題にならない。As is apparent from the above, in the conventional device, the polarizing plate 21A is changed from the natural light.
Since at least half of the light is absorbed by the polarizing plate 21A at the stage of extracting the linearly polarized light polarized in (2), there is a problem in that the light is effectively used. Further, the absorbed light is converted into heat and raises the temperature of the polarizing plate 21A.
There was also an incidental problem of degrading 1A. Therefore, not only the polarized component in a certain direction is extracted from the natural light by the polarizing plate 21A, but all the light from the light source can be converted into the polarized light in the certain direction, and the amount of light is increased and the polarizing plate by heat is generated. There is a demand for the development of a device that can solve the problem of deterioration. The problem of the deterioration of the second polarizing plate 21B is that the opening portion of the liquid crystal panel 7 is about 40% of the total area (the increase of the opening ratio is also an important factor for increasing the brightness of the liquid crystal color projection display). Therefore, the problem is not as large as that of the first polarizing plate 21A.
【０００９】したがって、本発明は上記したような従来
の問題点に鑑みてなされたもので、その目的とするとこ
ろは、自然光から直線偏光を取り出す段階で偏光板を使
用せず全ての光を一定方向に偏光した光に変換すること
ができ、光量を２倍に増大するに留まらず、熱による偏
光板劣化の問題を解消し得るようにした直線偏光変換装
置を提供することにある。Therefore, the present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to make all light constant without using a polarizing plate at the stage of extracting linearly polarized light from natural light. It is an object of the present invention to provide a linear polarization conversion device which can convert light into polarized light in a direction and can not only double the amount of light but also solve the problem of deterioration of a polarizing plate due to heat.
【００１０】[0010]
【課題を解決するための手段】本発明は上記目的を達成
するため、回転放物体等のリフレクタを備えた光源手段
と、この光源手段からの略平行な収束光の光軸上に配設
され、その収束光を振動面が互いに直交する２つの直線
偏光光に分光する偏光ビームスプリット手段と、この偏
光ビームスプリット手段の前記両直線偏光光の射出面に
対向させてそれぞれ設けた収束手段と、前記各収束手段
の焦点位置にそれぞれ位置する２つの入射面を有し、前
記両直線偏光光を合成する光ファイバとを備え、この光
ファイバは一方の直線偏光光の振動面を他方の直線偏光
光の振動面に一致させる振動面変換部を備えているもの
である。In order to achieve the above object, the present invention is provided with a light source means having a reflector such as a paraboloid of revolution, and a substantially parallel optical axis of convergent light from the light source means. A polarized beam splitting means for splitting the converged light into two linearly polarized light beams having oscillating planes orthogonal to each other, and a converging means provided so as to face the emission surfaces of the linearly polarized light beams of the polarized beam splitting means, respectively. An optical fiber having two incident surfaces respectively located at the focal positions of the respective converging means and combining the two linearly polarized lights is provided, and the optical fiber has a vibrating surface of one linearly polarized light and another linearly polarized light. It is provided with a vibration surface conversion unit that matches the vibration surface of light.
【００１１】[0011]
【作用】本発明において、光源手段から出射する光源光
は自然光であり、円偏光の性質を有してリフレクタによ
り光軸と略平行な収束光となり、偏光ビームスプリット
手段に入射する。偏光ビームスプリット手段は、入射し
た自然光を振動面が互いに直交する反射直線偏光光（Ｓ
波）と、透過直線偏光光（Ｐ波）とに分離する。光ファ
イバは、収束手段によって収束されたＳ波と、Ｐ波が入
射する入射面を有し、且つ振動面変換部によって一方の
直線偏光光の振動面を９０°回転させて他方の直線偏光
光の振動面と一致させることにより、入射面に入射する
全ての光を一定方向に偏光した直線偏光光に変換、合成
する。また、Ｓ波とＰ波の光路長を等しくすると、両波
の位相を同位相にして合成することができる。In the present invention, the light source light emitted from the light source means is natural light, has a property of circularly polarized light, becomes convergent light substantially parallel to the optical axis by the reflector, and enters the polarized beam splitting means. The polarized beam splitting means reflects the incident natural light into reflected linearly polarized light (S
Wave) and transmitted linearly polarized light (P wave). The optical fiber has an incident surface on which the S wave and the P wave converged by the converging means are incident, and the vibrating surface conversion unit rotates the vibrating surface of one linearly polarized light by 90 ° to rotate the other linearly polarized light. By matching with the vibrating surface of, all light incident on the incident surface is converted into linearly polarized light polarized in a certain direction and combined. Further, if the optical path lengths of the S wave and the P wave are made equal, the phases of both waves can be made the same phase and combined.
【００１２】[0012]
【実施例】以下、本発明を図面に示す実施例に基づいて
詳細に説明する。図１は本発明に係る直線偏光変換装置
の一実施例を示す外観斜視図、図２は図１のＡ−Ａ矢視
側面図である。これらの図において、本実施例は光源１
から出射した自然光２９を内面が回転放物反射面からな
るリフレクタ２によって光軸と平行な収束光３０とし、
この収束光３０を偏光ビームスプリット手段３１に入射
させることで、その誘電体多層膜３２によって振動面が
互いに直交する透過直線偏光光（以下Ｐ波と略称する）
３３と反射直線偏光光（以下Ｓ波と略称する）３４に分
光し、Ｐ波３３を集光レンズ（収束手段）３５によって
収束し、全反射ミラー３６によって光源光軸と直交する
方向に全反射させた後、光ファイバ３７の一方の入射面
３８に入射させる一方、Ｓ波３４を集光レンズ３９によ
って収束し、全反射ミラー４０によって光源光軸と平行
な方向に全反射させ、前記光ファイバ３７の他方の入射
面４１に入射させて前記Ｐ波３３とＳ波３４を同一光軸
上に合成すると共に、Ｐ波３３とＳ波３４の振動面を一
致させて液晶パネル７に導くようにしたものである。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the drawings. 1 is an external perspective view showing an embodiment of a linear polarization converter according to the present invention, and FIG. 2 is a side view taken along the line AA of FIG. In these figures, this embodiment shows the light source 1
The natural light 29 emitted from the light is converted into a convergent light 30 parallel to the optical axis by the reflector 2 whose inner surface is a rotating parabolic reflection surface,
By making the convergent light 30 enter the polarized beam splitting means 31, the transmitted linearly polarized light whose vibrating planes are orthogonal to each other due to the dielectric multilayer film 32 (hereinafter abbreviated as P wave).
33 and reflected linearly polarized light (hereinafter abbreviated as S wave) 34, and the P wave 33 is converged by a condenser lens (converging means) 35 and totally reflected by a total reflection mirror 36 in a direction orthogonal to the light source optical axis. Then, the S-wave 34 is converged by the condenser lens 39 and is totally reflected by the total reflection mirror 40 in the direction parallel to the optical axis of the light source while being incident on one incident surface 38 of the optical fiber 37. The P wave 33 and the S wave 34 are incident on the other incident surface 41 of 37 to be combined on the same optical axis, and the vibrating surfaces of the P wave 33 and the S wave 34 are made to coincide with each other and guided to the liquid crystal panel 7. It was done.
【００１３】偏光ビームスプリット手段３１は、２つの
直角プリズムのうちの一方の斜面に誘電体多層膜３２を
蒸着し、斜面同士を接合したものであり、収束光３０を
偏光方向が互いに直交する２つの直線偏光光に分離する
ことができ、その斜面を透過する光がＰ偏光の光３３で
あり、斜面で反射された光がＳ偏光の光３４である。な
お、分光直後のＰ波３３は、図１において進行方向に対
して直交する方向に振動する成分を持ち振動面がＹ方向
と平行な直線偏光光、Ｓ波３４は、図１においてＺ方向
に振動する成分を持つ直線偏光光で、振動面がＸ方向と
平行でＰ波３３の振動面と直交している。The polarized beam splitting means 31 is one in which a dielectric multilayer film 32 is vapor-deposited on one slope of one of two right-angle prisms and the slopes are joined together, and the convergent light 30 has polarization directions orthogonal to each other. The light that can be separated into two linearly polarized lights is the P-polarized light 33 that is transmitted through the slope, and the S-polarized light 34 is the light that is reflected by the slope. It should be noted that the P wave 33 immediately after the spectroscopy has a component that vibrates in a direction orthogonal to the traveling direction in FIG. 1 and has linearly polarized light whose vibrating surface is parallel to the Y direction, and the S wave 34 in the Z direction in FIG. It is a linearly polarized light having a vibrating component, and its vibrating plane is parallel to the X direction and orthogonal to the vibrating plane of the P wave 33.
【００１４】前記集光レンズ３５と３９は、前記偏光ビ
ームスプリット手段３１のＰ波３３とＳ波３４の射出面
４２、４３に対してそれぞれ平行に対向配置されてい
る。第１の全反射ミラー３６と４０は、前記射出面４
２、４３に対してそれぞれ４５°傾斜し、且つ互いに正
対するよう、すなわち互いに反射面を平行に対向させて
配設されている。The condenser lenses 35 and 39 are arranged in parallel and opposite to the exit surfaces 42 and 43 of the P-wave 33 and the S-wave 34 of the polarized beam splitting means 31, respectively. The first total reflection mirrors 36 and 40 are provided on the exit surface 4
They are inclined 45 ° with respect to 2 and 43, respectively, and are arranged so as to face each other, that is, the reflecting surfaces thereof face each other in parallel.
【００１５】前記光ファイバ３７は、軸線が光源光軸と
直交しＹ方向と平行に配設されて、光源側端部が分岐さ
れることにより２つの分枝部３７Ａ、３７Ｂを有し、そ
の端面が前記入射面３８、４１とされ、液晶パネル側端
面が出射面４４を形成している。また各分枝部３７Ａ、
３７Ｂは互いに直角に交差し、分枝部３７ＡがＰ波３３
を入射させるべく全反射ミラー３６方向に、分枝部３７
ＢがＳ波３４を入射させるべく全反射ミラー４０方向に
それぞれ９０°屈曲されており、入射面３８、４１が前
記集光レンズ３５、３９の焦点位置と一致している。こ
のため、各分枝部３７Ａ、３７Ｂの屈曲部はそれぞれ振
動面変換部４５、４６をそれぞれ形成している。そし
て、光源１から各入射面３８、４１までの光路長は等し
く設定されている。このような光ファイバ３７の断面形
状としては円形に限らず、矩形等用途に応じて種々変更
可能である。また多数の微細なファイバを束ねて１つの
光ファイバとしてもよい。なお、５０、５１はＰ波３３
とＳ波３４の波形を示す。The optical fiber 37 has two branch portions 37A and 37B, whose axis is orthogonal to the optical axis of the light source and is parallel to the Y direction, and the light source side end portion is branched. The end faces are the incident faces 38 and 41, and the liquid crystal panel side end face forms the emission face 44. In addition, each branch 37A,
37B intersect each other at a right angle, and the branch portion 37A has a P wave 33.
In the direction of the total reflection mirror 36 so that the
B is bent by 90 ° in the direction of the total reflection mirror 40 so as to make the S wave 34 incident, and the incident surfaces 38 and 41 coincide with the focal positions of the condenser lenses 35 and 39. Therefore, the bent portions of the branched portions 37A and 37B form the vibration surface conversion portions 45 and 46, respectively. The optical path lengths from the light source 1 to the incident surfaces 38 and 41 are set to be equal. The cross-sectional shape of such an optical fiber 37 is not limited to a circular shape, but can be variously changed depending on the application such as a rectangular shape. Also, a large number of fine fibers may be bundled into one optical fiber. In addition, 50 and 51 are P waves 33
And the waveform of the S wave 34 are shown.
【００１６】このような構成において、偏光ビームスプ
リット手段３１を透過するＰ波３３は、上記した通りＹ
方向と平行な振動面を有し、全反射ミラー３６によって
光源光軸と直交する方向に反射すると、進行方向が９０
°変換されてＸ方向となり、振動面が同じく９０°回転
してＺ方向と直交する直線偏光光となり、さらに光ファ
イバ３７の入射面３８に入射して振動面変換部４５によ
り光源光軸と直交する面内にて進行方向が９０°変換さ
れると、振動面は変わらず進行方向がＹ方向の直線偏光
光（Ｓ’波）となる。一方、偏光ビームスプリット手段
３１の誘電体多層膜３２によって反射したＳ波３４は、
振動方向がＺ方向でＹ方向と直交する振動面を有し、全
反射ミラー４０によって光源光軸と平行な方向に反射す
ると、進行方向が９０°変換されてＺ方向となり振動面
は変わらず、さらに光ファイバ３７の入射面４１に入射
して振動面変換部４６により光源光軸と直交する方向に
変換されると、進行方向が前記Ｐ波３３と同方向（Ｙ方
向）で、振動面がＺ方向と直交する、つまりＰ波３３と
同一の振動面を有する直線偏光光（Ｓ波）となり、Ｐ波
３３と同じ光軸上に合成される。また、光源１から各入
射面３８、４１までの光路長は等しく設定されているの
で、Ｐ波３３とＳ波３４の位相も等しい。したがって、
光源１から出た全ての自然光２９を、損失なく反射直線
偏光光（Ｓ波＋Ｓ’波）として取り出すことができ、液
晶パネル７に入射する偏光光の光量を従来の２倍に増大
させることができる。また、従来装置と異なり偏光板を
必要としないので、熱による偏光板劣化の問題も解消す
ることができる。In such a structure, the P wave 33 transmitted through the polarized beam splitting means 31 is Y as described above.
When it is reflected by the total reflection mirror 36 in a direction orthogonal to the light source optical axis, the traveling direction is 90 °.
Is converted into the X direction, the vibrating surface is also rotated by 90 ° into linearly polarized light orthogonal to the Z direction, and further enters the incident surface 38 of the optical fiber 37 and is orthogonal to the light source optical axis by the vibrating surface converting unit 45. When the traveling direction is converted by 90 ° in the plane, the vibrating surface remains unchanged and the traveling direction becomes linearly polarized light (S ′ wave) in the Y direction. On the other hand, the S wave 34 reflected by the dielectric multilayer film 32 of the polarized beam splitting means 31 is
When the total reflection mirror 40 has a vibration surface whose vibration direction is the Z direction and is orthogonal to the Y direction and is reflected in a direction parallel to the light source optical axis, the traveling direction is converted by 90 ° to become the Z direction, and the vibration surface does not change. Further, when the light enters the incident surface 41 of the optical fiber 37 and is converted into a direction orthogonal to the light source optical axis by the vibrating surface conversion unit 46, the traveling direction is the same direction as the P wave 33 (Y direction), and the vibrating surface is It becomes a linearly polarized light (S wave) that is orthogonal to the Z direction, that is, has the same vibration plane as the P wave 33, and is combined on the same optical axis as the P wave 33. Further, since the optical path lengths from the light source 1 to the incident surfaces 38 and 41 are set to be equal, the phases of the P wave 33 and the S wave 34 are also equal. Therefore,
All the natural light 29 emitted from the light source 1 can be extracted as reflected linearly polarized light (S wave + S ′ wave) without loss, and the amount of polarized light entering the liquid crystal panel 7 can be doubled as compared with the conventional one. it can. Further, unlike the conventional apparatus, since no polarizing plate is required, the problem of deterioration of the polarizing plate due to heat can be solved.
【００１７】なお、上記実施例においては、分枝部３７
Ａの振動面変換部４５によってＰ波３３の振動面を同一
平面内にて９０°回転させ、分枝部３７Ｂの振動面変換
部４６によってＳ波３４の振動面を２つの直交する面間
で９０°回転させたが、液晶パネル７を光ファイバ３７
の図１において左側に配置し、光ファイバ３７を反転さ
せば、上記したとは逆に、分枝部３７Ａの振動面変換部
４５によってＰ波３３の振動面を２つの直交する面間で
９０°回転させ、分枝部３７Ｂの振動面変換部４６によ
ってＳ波３４の振動面を同一平面内にて９０°回転させ
ることができる。In the above embodiment, the branch portion 37
The vibration surface conversion unit 45 of A rotates the vibration surface of the P wave 33 by 90 ° in the same plane, and the vibration surface conversion unit 46 of the branch unit 37B rotates the vibration surface of the S wave 34 between two orthogonal surfaces. The liquid crystal panel 7 was rotated by 90 °, but the optical fiber 37
1 is arranged on the left side and the optical fiber 37 is inverted, conversely to the above, the vibration surface conversion unit 45 of the branch portion 37A causes the vibration surface of the P wave 33 to move between two orthogonal surfaces by 90 degrees. The vibration surface of the S wave 34 can be rotated by 90 degrees in the same plane by the vibration surface conversion unit 46 of the branch portion 37B.
【００１８】図３は本発明の他の実施例を示す概略構成
図、図４は光ファイバの要部斜視図である。この実施例
は上記した実施例において用いた全反射ミラー３６、４
０を廃止し、光ファイバのみでＰ波３３の振動面を回転
させ、Ｓ波３４の振動面と一致させるようにしたもので
ある。偏光ビームスプリット手段３１を透過するＰ波３
３は、振動方向がＹ方向で、Ｚ方向と直交する振動面を
有し、Ｓ波３４は振動方向がＺ方向で振動面がＸ方向と
直交している。光ファイバ３７の一方の分枝部３７Ａは
それぞれ２つの直交する第１、第２の振動面変換部６
０、６１を有し、第１の振動面変換部６０がＸ方向から
Ｚ方向に９０°屈曲し、第２の振動面変換部６１がＺ方
向からＹ方向に９０°屈曲している。一方、他方の分枝
部３７Ａは振動面変換部を有していない。したがって、
入射面４１から入射するＳ波３４は振動面を変換される
ことなく光ファイバ３７内を進行する。これに対して、
Ｐ波３３は入射面３８から分枝部３７Ａ内に入射する
と、第１の振動面変換部６０によって進行方向がＺ方向
に９０°変換されることで、振動方向がＹ方向で変わら
ず、振動面が９０°回転してＸ方向と直交する直線偏光
光となり、さらに第２の偏光面変換部６１によって進行
方向がＹ方向に９０°変換されることにより、振動方向
がＺ方向で振動面が９０°回転してＸ方向と直交する直
線偏光光（Ｓ’波）となる。つまり、Ｐ波３３はＳ波３
４と同一の振動面を有する直線偏光光となり、光ファイ
バ３７内でＳ波３４と同じ光軸上に合成される。また、
光源１から各入射面３８、４１までの光路長は等しく設
定されているので、Ｐ波３３とＳ波３４の位相も等し
い。したがって、本実施例においても光源１から出た全
ての自然光２９を、損失なく反射直線偏光光（Ｓ波＋
Ｓ’波）として取り出すことができ、上記実施例と同様
な効果が得られるものである。FIG. 3 is a schematic structural view showing another embodiment of the present invention, and FIG. 4 is a perspective view of an essential part of an optical fiber. In this embodiment, the total reflection mirrors 36 and 4 used in the above embodiments are used.
0 is abolished, and the vibration surface of the P wave 33 is rotated only by the optical fiber so as to match the vibration surface of the S wave 34. P wave 3 transmitted through the polarized beam splitting means 31
3 has a vibrating surface whose vibrating direction is the Y direction and is orthogonal to the Z direction, and the S wave 34 has a vibrating direction which is the Z direction and a vibrating surface which is orthogonal to the X direction. One branch portion 37A of the optical fiber 37 has two orthogonal first and second vibration surface conversion portions 6 respectively.
0, 61, the first vibration surface conversion portion 60 is bent 90 degrees from the X direction to the Z direction, and the second vibration surface conversion portion 61 is bent 90 degrees from the Z direction to the Y direction. On the other hand, the other branch portion 37A does not have a vibration surface conversion portion. Therefore,
The S wave 34 incident from the incident surface 41 travels in the optical fiber 37 without being converted on the vibration surface. On the contrary,
When the P wave 33 enters the branch portion 37A from the incident surface 38, the traveling direction of the P wave 33 is changed by 90 ° in the Z direction by the first vibrating surface conversion unit 60, so that the vibration direction does not change in the Y direction and vibrates. The plane is rotated by 90 ° to become linearly polarized light orthogonal to the X direction, and the second polarization plane conversion unit 61 further converts the traveling direction by 90 ° to the Y direction, whereby the vibration direction is the Z direction and the vibration surface is It is rotated by 90 ° and becomes linearly polarized light (S ′ wave) orthogonal to the X direction. That is, P wave 33 is S wave 3
4 becomes linearly polarized light having the same vibrating surface and is combined on the same optical axis as the S wave 34 in the optical fiber 37. Also,
Since the optical path lengths from the light source 1 to the incident surfaces 38 and 41 are set to be equal, the phases of the P wave 33 and the S wave 34 are also equal. Therefore, also in this embodiment, all the natural light 29 emitted from the light source 1 is reflected linearly polarized light (S wave +
S'wave) can be taken out, and the same effect as in the above embodiment can be obtained.
【００１９】[0019]
【発明の効果】以上説明したように本発明に係る直線偏
光変換装置は、自然光から直線偏光光を取り出す段階
で、偏光ビームスプリット手段により振動面が互いに直
交する２つの直線偏光光に分光し、光ファイバによって
これら両偏光光を合成すると共に、該ファイバに設けた
振動面変換部によって一方の偏光光の振動面を回転させ
他方の偏光光の振動面と一致させるように構成したの
で、偏向板を使用せず全ての光を一定方向に偏光した光
に変換することができる。この結果、光の損失がなく光
量を増大させることができ、また、従来のごとく偏光板
を用いた際に生じる光吸収による温度上昇に伴って引き
起こす偏光板の劣化の問題も解消することができる。As described above, the linearly polarized light conversion device according to the present invention splits linearly polarized light from natural light into two linearly polarized lights whose vibrating surfaces are orthogonal to each other by the polarization beam splitting means, The optical fiber is configured to combine these polarized lights, and the vibrating surface conversion unit provided in the fiber rotates the vibrating surface of one polarized light so as to match the vibrating surface of the other polarized light. It is possible to convert all light into light polarized in a fixed direction without using. As a result, it is possible to increase the amount of light without loss of light, and it is also possible to solve the problem of deterioration of the polarizing plate caused by temperature rise due to light absorption that occurs when a polarizing plate is used as in the past. ..
【図１】本発明に係る直線偏光変換装置の一実施例を示
す斜視図である。FIG. 1 is a perspective view showing an embodiment of a linear polarization converter according to the present invention.
【図２】図１のＡ−Ａ矢視側面図である。FIG. 2 is a side view taken along the line AA of FIG.
【図３】本発明の他の実施例を示す概略構成図である。FIG. 3 is a schematic configuration diagram showing another embodiment of the present invention.
【図４】光ファイバの要部斜視図である。FIG. 4 is a perspective view of a main part of an optical fiber.
【図５】液晶カラー投射装置の従来例を示す模式図であ
る。FIG. 5 is a schematic view showing a conventional example of a liquid crystal color projection device.
【図６】液晶パネルと偏光板の構成を示す図である。FIG. 6 is a diagram showing a configuration of a liquid crystal panel and a polarizing plate.
１ 光源 ２ リフレクタ ４、１１ 分光用ダイクロイックミラー ７、１２、１５ 液晶パネル １３、１７ 合成用ダイクロイックミラー ３０ 収束光 ３１ 偏光ビームスプリット手段 ３２ 誘電体多層膜 ３３ Ｐ波 ３４ Ｓ波 ３５、３９ 集光レンズ ３６、４０ 全反射ミラー ３７ 光ファイバ ３８、４１ 入射面 ４４ 出射面 ４５、４６ 振動面変換部 ６０ 第１の振動面変換部 ６１ 第２の振動面変換部 1 Light Source 2 Reflector 4, 11 Spectral Dichroic Mirror 7, 12, 15 Liquid Crystal Panel 13, 17 Synthetic Dichroic Mirror 30 Converged Light 31 Polarized Beam Splitting Means 32 Dielectric Multilayer Film 33 P Wave 34 S Wave 35, 39 Condenser Lens 36, 40 Total reflection mirror 37 Optical fiber 38, 41 Incident surface 44 Emission surface 45, 46 Vibration surface conversion unit 60 First vibration surface conversion unit 61 Second vibration surface conversion unit
Claims (1)
手段と、この光源手段からの略平行な収束光の光軸上に
配設され、その収束光を振動面が互いに直交する２つの
直線偏光光に分光する偏光ビームスプリット手段と、こ
の偏光ビームスプリット手段の前記両直線偏光光の射出
面に対向させてそれぞれ設けた収束手段と、前記各収束
手段の焦点位置にそれぞれ位置する２つの入射面を有
し、前記両直線偏光光を合成する光ファイバとを備え、
この光ファイバは一方の直線偏光光の振動面を他方の直
線偏光光の振動面に一致させる振動面変換部を備えてい
ることを特徴とする直線偏光変換装置。1. A light source means provided with a reflector such as a paraboloid of revolution, and two straight lines arranged on the optical axis of the substantially parallel convergent light from the light source means and having their vibrating surfaces orthogonal to each other. Polarized beam splitting means for splitting into polarized light, converging means provided so as to face the exit surfaces of the linearly polarized light of the polarized beam splitting means, and two incident lights respectively located at focal points of the respective converging means. An optical fiber having a surface and combining the two linearly polarized lights,
This optical fiber is provided with a vibrating surface conversion unit that matches the vibrating surface of one linearly polarized light with the vibrating surface of the other linearly polarized light.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3341791A JPH05150190A (en) | 1991-12-02 | 1991-12-02 | Linear polarized light conversion device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3341791A JPH05150190A (en) | 1991-12-02 | 1991-12-02 | Linear polarized light conversion device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05150190A true JPH05150190A (en) | 1993-06-18 |
Family
ID=18348791
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3341791A Pending JPH05150190A (en) | 1991-12-02 | 1991-12-02 | Linear polarized light conversion device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05150190A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003248270A (en) * | 2002-02-01 | 2003-09-05 | Samsung Electronics Co Ltd | Illumination system and projection display device employing the same |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0264613A (en) * | 1988-08-31 | 1990-03-05 | Seiko Epson Corp | Polarization light source |
| JPH03152523A (en) * | 1989-11-09 | 1991-06-28 | Sharp Corp | Liquid crystal projector |
-
1991
- 1991-12-02 JP JP3341791A patent/JPH05150190A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0264613A (en) * | 1988-08-31 | 1990-03-05 | Seiko Epson Corp | Polarization light source |
| JPH03152523A (en) * | 1989-11-09 | 1991-06-28 | Sharp Corp | Liquid crystal projector |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003248270A (en) * | 2002-02-01 | 2003-09-05 | Samsung Electronics Co Ltd | Illumination system and projection display device employing the same |
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