JPS63197913A - Polarization converting element - Google Patents
Polarization converting elementInfo
- Publication number
- JPS63197913A JPS63197913A JP2956287A JP2956287A JPS63197913A JP S63197913 A JPS63197913 A JP S63197913A JP 2956287 A JP2956287 A JP 2956287A JP 2956287 A JP2956287 A JP 2956287A JP S63197913 A JPS63197913 A JP S63197913A
- Authority
- JP
- Japan
- Prior art keywords
- light
- polarized light
- polarization
- reflected
- 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
- 230000010287 polarization Effects 0.000 title claims abstract description 58
- 238000006243 chemical reaction Methods 0.000 claims description 12
- 230000002250 progressing effect Effects 0.000 abstract 2
- 230000002194 synthesizing effect Effects 0.000 abstract 2
- 230000004907 flux Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 12
- 230000000694 effects Effects 0.000 description 5
- 206010041662 Splinter Diseases 0.000 description 4
- 239000004973 liquid crystal related substance Substances 0.000 description 3
- 239000000284 extract Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 239000002985 plastic film Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- PNDPGZBMCMUPRI-UHFFFAOYSA-N iodine Chemical compound II PNDPGZBMCMUPRI-UHFFFAOYSA-N 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は不定偏光光から直線偏光光を得る偏光変換素子
に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a polarization conversion element that obtains linearly polarized light from irregularly polarized light.
従来、不定偏光光から直線偏光光を得るには、不定偏光
光を偏光子や複屈折性のある結晶を透過させたり、境界
面で反射させることにより、直線偏光光を選択する素子
が用いられている。−例として、薄いプラスチックシー
ト等に沃素等を配向させて吸着させる等により偏光膜を
作成し、両面に保護プラスチックシート等を接着した構
造のシート・ポラライザや、複屈折性のある結晶中の常
光線と異常光線の光の進行方向の違いから直線偏光光を
取り出すニコル・プリズム、ローション・プリズム等が
ある。また、２つの直角プリズムの斜辺の一方に半透膜
をコートして斜辺どうしを接合し、透過光と反射光とを
互いに直交した直線偏光光として取り出す偏光ビームス
プリッタがある。Conventionally, to obtain linearly polarized light from irregularly polarized light, an element is used that selects linearly polarized light by transmitting the irregularly polarized light through a polarizer or a crystal with birefringence, or by reflecting it at an interface. ing. - Examples include sheet polarizers, which have a structure in which a polarizing film is created by orienting and adsorbing iodine, etc. to a thin plastic sheet, etc., and protective plastic sheets, etc. are adhered to both sides; There are Nicol prisms, Rochon prisms, etc. that extract linearly polarized light from the difference in the traveling directions of light rays and extraordinary rays. Furthermore, there is a polarizing beam splitter that coats one of the oblique sides of two right-angled prisms with a semi-transparent film to join the oblique sides together, and extracts transmitted light and reflected light as linearly polarized light orthogonal to each other.
しかし、従来のシート・ポラライザや偏光ビームスプリ
ッタを単独で用いる場合、不用の偏光成分の光を吸収あ
るいは反射するため、光源の光利用効率は半分以下と低
くならざるを得ない。直線偏光光を利用する装置の例と
して、ＴＮ（ツイスト・ネマチック）液晶を用いた液晶
表示装置の場合、偏光子２枚を透過する間に光源からの
光は６０、％以上が損失する。さらに液晶や素子の端面
反射により、装置全体の光利用効率は２０％程度になり
、表示のために十分な光量を得るには、光源の輝度を高
くしなければならないので、消費電力が大きなものにな
ってしまう。However, when a conventional sheet polarizer or polarizing beam splitter is used alone, the light utilization efficiency of the light source is inevitably reduced to less than half because unnecessary polarized light components are absorbed or reflected. As an example of a device that uses linearly polarized light, in the case of a liquid crystal display device that uses TN (twisted nematic) liquid crystal, more than 60% of the light from the light source is lost while passing through two polarizers. Furthermore, due to the edge reflections of the liquid crystal and elements, the light utilization efficiency of the entire device is reduced to about 20%, and in order to obtain a sufficient amount of light for display, the brightness of the light source must be increased, so power consumption is high. Become.
本発明の目的は、不定偏光の光から直線偏光光を得る偏
光変換素子であって、光源の光利用効率を高めるための
素子を提供することにある。An object of the present invention is to provide a polarization conversion element for obtaining linearly polarized light from undefined polarized light, and for improving the light utilization efficiency of a light source.
本発明の偏光変換素子は、光源からの不定偏光光を主に
Ｐ−偏光成分の直線偏光光とＳ−偏光成分の直線偏光光
とに空間的分離を行うための偏光ビームスプリッタと、
前記Ｐ−偏光成分の直線偏光光と前記Ｓ−偏光成分の直
線偏光光のどちらか一方の直線偏光光の偏光方向と、も
う一方の直線偏光光の偏光方向とが等しくなるように、
２つの前記直線偏光光を合成するための、反射法線方向
が直交するように配置した２枚の全反射ミラーを含む少
なくとも２枚以上の全反射ミラーとから構成されること
を特徴とする。The polarization conversion element of the present invention includes a polarization beam splitter for spatially separating irregularly polarized light from a light source into linearly polarized light mainly having a P-polarized component and linearly polarized light having an S-polarized component;
so that the polarization direction of one of the linearly polarized light of the P-polarized light component and the linearly polarized light of the S-polarized light component is equal to the polarization direction of the other linearly polarized light,
It is characterized by comprising at least two total reflection mirrors, including two total reflection mirrors arranged so that the normal directions of reflection are orthogonal to each other for combining the two linearly polarized lights.
第５図は本発明の詳細な説明するための図である。偏光
方向３１の直線偏光である入射光３０は全反射ミラー３
２．３３．３４で３回反射を行うと、各反射光３５．３
６．３７の偏光方向は光の進行方向に対し偏光方向３８
，３９．４０のように変化する。このとき、全反射ミラ
ー３３と３４とは、反射法線方向が直交するように配置
されている。第５図から明らかなように光学系を通過し
た反射光３７は進行方向が入射光３０と等しく、かつ、
偏光方向が入射光３０の偏光方向３１と直交する偏光方
向４１になる。このように全反射ミラーを用いることに
より、直線偏光光の偏光方向を任意に変換することが可
能である。FIG. 5 is a diagram for explaining the present invention in detail. Incident light 30, which is linearly polarized light with a polarization direction 31, is reflected by a total reflection mirror 3.
2.3 If reflection is performed three times at 34, each reflected light is 35.3
6.37 polarization direction is polarization direction 38 with respect to the traveling direction of light.
, 39.40. At this time, the total reflection mirrors 33 and 34 are arranged so that their reflection normal directions are perpendicular to each other. As is clear from FIG. 5, the traveling direction of the reflected light 37 that has passed through the optical system is the same as that of the incident light 30, and
The polarization direction becomes a polarization direction 41 orthogonal to the polarization direction 31 of the incident light 30. By using a total reflection mirror in this manner, it is possible to arbitrarily convert the polarization direction of linearly polarized light.
本発明は、以上の原理を利用し、光源からの不定偏光を
偏光ビームスプリッタに入射させ、互いに直交する直線
偏光の透過光と反射光とに空間的に分離した後、透過光
と反射光のどちらか一方を少なくとも２枚以上の全反射
ミラーで複数回反射させることにより、２つの光の偏光
方向が等しくなるように合成することで光源の光利用効
率の高い偏光変換素子を得ている。 。Utilizing the above principle, the present invention makes undefined polarized light from a light source enter a polarizing beam splitter, spatially separates it into transmitted light and reflected light that are orthogonal to each other, and then separates the transmitted light and reflected light. By reflecting one of the lights multiple times with at least two or more total reflection mirrors, the two lights are combined so that the polarization directions are equal, thereby obtaining a polarization conversion element with high light utilization efficiency of the light source. .
第１図は本発明の第１の実施例を示す図である。 FIG. 1 is a diagram showing a first embodiment of the present invention.
この偏光変換素子は、キセノンランプやハロゲンランプ
等の光源１と、光源１からの光を平行光束にするコンデ
ンサレンズ２と、偏光ビームスプリンタ、４と、２枚の
全反射ミラー５，６とから構成されている。なお、２枚
の全反射ミラー５と６とは、反射法線方向が直交するよ
うに配置している。This polarization conversion element consists of a light source 1 such as a xenon lamp or a halogen lamp, a condenser lens 2 that converts the light from the light source 1 into a parallel beam, a polarization beam splinter 4, and two total reflection mirrors 5 and 6. It is configured. Note that the two total reflection mirrors 5 and 6 are arranged so that their reflection normal directions are perpendicular to each other.
偏光ビームスプリッタ４は２つの直角プリズムの斜辺の
一方に、金属膜や誘電体多層膜等から成る半透膜をコー
トして斜辺どうしを接合したもので、特に可視域内で有
効にＰ−偏光とＳ−偏光とに分離できるものを用いた。The polarizing beam splitter 4 is made by coating one of the hypotenuses of two right-angled prisms with a semi-transparent film made of a metal film, dielectric multilayer film, etc. and joining the hypotenuses together, which effectively splits P-polarized light especially in the visible range. A beam that can be separated into S-polarized light was used.
また、全反射ミラー５及び６は、アルミニウムや銀等の
金属反射膜や誘電体多層膜から成る、可視域において反
射率の高い反射ミラーを用いた。Further, as the total reflection mirrors 5 and 6, reflection mirrors having a high reflectance in the visible range and made of a metal reflection film such as aluminum or silver or a dielectric multilayer film were used.
このような構成の偏光変換素子において、光源ｌから不
定偏光の光を放射し、コンデンサレンズ２で平行光束に
し、入射光３を得る。入射光３を偏光ビームスプリンタ
４に入射させると、透過光７はＰ−偏光（偏光方向９）
の直線偏光、反射光８はＳ−偏光（偏光方向１０）の直
線偏光になる。In the polarization conversion element having such a configuration, a light source 1 emits undefined polarized light, which is converted into a parallel light beam by a condenser lens 2 to obtain an incident light 3. When the incident light 3 enters the polarization beam splinter 4, the transmitted light 7 becomes P-polarized light (polarization direction 9).
The reflected light 8 becomes linearly polarized light of S-polarization (polarization direction 10).
反射光８は全反射ミラー５及び６で反射することにより
、それぞれ偏光方向が偏光方向１１．１２のように変化
する。全反射ミラー６で反射された反射光１５は、透過
光７と同一の進行方向であり、かつ、偏光方向１３と１
４は等しい。したがって反射光１５ど透過光７を合成す
ることにより、光源１からの不定偏光光を直線偏光光に
変換する際の光利用効率は合成した反射光１５の分だけ
高めることができた。By being reflected by the total reflection mirrors 5 and 6, the reflected light 8 changes its polarization direction into polarization directions 11 and 12, respectively. The reflected light 15 reflected by the total reflection mirror 6 travels in the same direction as the transmitted light 7, and has polarization directions 13 and 1.
4 is equal. Therefore, by combining the reflected light 15 and the transmitted light 7, the light utilization efficiency when converting the undefined polarized light from the light source 1 into linearly polarized light could be increased by the amount of the combined reflected light 15.
第２図は本発明の第２の実施例を示す図である。FIG. 2 is a diagram showing a second embodiment of the present invention.
本実施例は、第１の実施例が偏光ビームスプリンタから
の反射光を、全反射ミラーで反射させているのに対し、
ビームスプリッタからの透過光を全反射ミラーで反射さ
せるものである。図中、１６及び１７は反射法線方向が
直交するように配置された全反射ミラーであり、これら
全反射ミラー及び偏光ビームスプリッタ４は、第１の実
施例と同様のものを用いた。In contrast to the first embodiment in which the reflected light from the polarizing beam splinter is reflected by a total reflection mirror, in this embodiment,
The transmitted light from the beam splitter is reflected by a total reflection mirror. In the figure, reference numerals 16 and 17 are total reflection mirrors arranged such that their reflection normal directions are perpendicular to each other, and these total reflection mirrors and the polarizing beam splitter 4 are the same as those in the first embodiment.
このような構成の偏光変換素子において、第１の実施例
と同様にして得られた入射光３を偏光ビームスプリッタ
４に入射させると透過光７はＰ−偏光（偏光方向９）の
直線偏光、反射光８はＳ−偏光（偏光方向１０）の直線
偏光になる。透過光７は全反射ミラー１６及び１７で反
射することにより、それぞれ偏光方向が偏光方向１１．
１２のように変化する。全反射ミラー１７で反射された
反射光１５は、透過光８と同一の進行方向であり、かつ
、偏光方向１０と１２は等しい。従って反射光１５と反
射光８を合成することにより、光源からの不定偏光光を
直線偏光光に変換する際の光利用効率は合成した反射光
１５の分だけ高めることができた。以上のように、偏光
ビームスプリッタ４からの透過光７を全反射ミラー１６
．１７で反射することにより第１の実施例と同様の効果
が得られた。In the polarization conversion element having such a configuration, when the incident light 3 obtained in the same manner as in the first embodiment is made incident on the polarization beam splitter 4, the transmitted light 7 becomes P-polarized light (polarization direction 9) linearly polarized light, The reflected light 8 becomes S-polarized (polarization direction 10) linearly polarized light. The transmitted light 7 is reflected by the total reflection mirrors 16 and 17, so that the polarization direction becomes the polarization direction 11.
It changes like 12. The reflected light 15 reflected by the total reflection mirror 17 travels in the same direction as the transmitted light 8, and the polarization directions 10 and 12 are the same. Therefore, by combining the reflected light 15 and the reflected light 8, the light utilization efficiency when converting undefined polarized light from the light source into linearly polarized light could be increased by the amount of the combined reflected light 15. As described above, the transmitted light 7 from the polarizing beam splitter 4 is reflected by the total reflection mirror 16.
．． By reflecting at 17, the same effect as in the first example was obtained.
第３図は本発明の第３の実施例を示す図である。FIG. 3 is a diagram showing a third embodiment of the present invention.
本実施例は、第１及び第２の実施例が２枚の全反射ミラ
ーを用いるのに対し、４枚の全反射ミラー１８、１９，
２０．２１を用いるようにしたものであり、さらに偏光
度の良い直線偏光光を得るためにシート・ポラライザ２
２を用いている。全反射ミラー１８と１９は、反射法線
方向が直交するように配置されている。なお、４枚の全
反射ミラー及び偏光ビームスプリッタ４は、第１の実施
例と同様のものを用いた。In contrast to the first and second embodiments, which use two total reflection mirrors, this embodiment uses four total reflection mirrors 18, 19,
20.21, and in order to obtain linearly polarized light with a good degree of polarization, a sheet polarizer 2 is used.
2 is used. The total reflection mirrors 18 and 19 are arranged so that their reflection normal directions are perpendicular to each other. Note that the four total reflection mirrors and the polarizing beam splitter 4 were the same as those in the first embodiment.
このような構成の偏光変換素子において、第１の実施例
と同様にして得られた入射光３を偏光ビームスプリンタ
４に入射させると、透過光７はＰ−偏光（偏光方向９）
の直線偏光、反射光８はＳ−偏光（偏光方向１０）の直
線偏光になる。反射光８は全反射ミラー１８及び１９で
反射することにより、それぞれ偏光方向が偏光方向１１
．２３のように変化する。全反射ミラー１９で反射され
た反射光１５は、透過光７と同一の進行方向であり、か
つ、偏光方向９と２３は等しい。全反射ミラー２０で反
射された反射光２８（偏光方向２４）は、さらに、全反
射ミラー２１で反射される。全反射ミラー２１で反射さ
れた反射光２９は、透過光７と同一の進行方向であり、
かつ、偏光方向９と２５は等しい。したがってシート・
ポラライザ２２を透過した反射光２９及び透過光７の偏
光方向２６と２７は等しい。以上のように、偏光ビーム
スプリッタ４の反射光８を全反射ミラー１８、１９．２
０．２１で４回反射させることで第１の実施例と同様の
効果が得られた。さらにシート・ポラライザ２２を光学
系に挿入することにより、さらに偏光度の良い直線偏光
光が得られた。In the polarization conversion element having such a configuration, when the incident light 3 obtained in the same manner as in the first embodiment is made incident on the polarization beam splinter 4, the transmitted light 7 becomes P-polarized light (polarization direction 9).
The reflected light 8 becomes linearly polarized light of S-polarization (polarization direction 10). The reflected light 8 is reflected by the total reflection mirrors 18 and 19, so that the polarization direction becomes the polarization direction 11.
．． It changes like 23. The reflected light 15 reflected by the total reflection mirror 19 travels in the same direction as the transmitted light 7, and the polarization directions 9 and 23 are the same. The reflected light 28 (polarization direction 24) reflected by the total reflection mirror 20 is further reflected by the total reflection mirror 21. The reflected light 29 reflected by the total reflection mirror 21 travels in the same direction as the transmitted light 7,
Moreover, the polarization directions 9 and 25 are equal. Therefore, the seat
The polarization directions 26 and 27 of the reflected light 29 and the transmitted light 7 that have passed through the polarizer 22 are equal. As described above, the reflected light 8 of the polarizing beam splitter 4 is reflected by the total reflection mirrors 18, 19.2.
The same effect as the first example was obtained by reflecting the light four times at an angle of 0.21. Furthermore, by inserting a sheet polarizer 22 into the optical system, linearly polarized light with an even better degree of polarization was obtained.
第４図（ａ）、 （ｂ）は本発明の詳細な説明するた
めの図である。第４図（ａ）はシート・ポラライザを単
独で使用した場合の光利用効率を示し、４０％弱と低い
ものである。第４図（ｂ）は本発明の偏光変換素子を用
いた場合の光利用効率を示すレベルダイヤグラムである
。合波後の光利用効率は、約８５％と良好であった。最
後にシート・ポラライザを挿入しても７０％程度の光利
用効率が得られた。FIGS. 4(a) and 4(b) are diagrams for explaining the present invention in detail. FIG. 4(a) shows the light utilization efficiency when the sheet polarizer is used alone, which is low at just under 40%. FIG. 4(b) is a level diagram showing the light utilization efficiency when using the polarization conversion element of the present invention. The light utilization efficiency after multiplexing was about 85%, which was good. Even when a sheet polarizer was inserted at the end, a light utilization efficiency of about 70% was obtained.
このように本発明によれば、不定偏光の光から直線偏光
光を得る偏光変換素子において、光源の光利用効率の高
い偏光変換素子を得ることができた。As described above, according to the present invention, it was possible to obtain a polarization conversion element that obtains linearly polarized light from undefined polarized light and has high light utilization efficiency of a light source.
また、本発明の偏光変換素子はモジュール化することに
より、コンパクトな構成で同様の効果を得ることができ
る。Further, by modularizing the polarization conversion element of the present invention, similar effects can be obtained with a compact configuration.
第１図は本発明の第１の実施例を示す図、第２図は本発
明の第２の実施例を示す図、第３図は本発明の第３の実
施例を示す図、第４図（ａ）、 （ｂ）は本発明の詳
細な説明するための図、
第５図は本発明の詳細な説明するための図である。
１、・・・・・光源
２・・・・・コンデンサレンズ
３・・・・・入射光
４・・・・・偏光ビームスプリッタ
５．６・・・全反射ミラー
７・・・・・透過光
８．１５・・・反射光
’ ９．１０．１１．１２．１３．１４・・・偏光方向
２２・・・・・シート・ポラライザ
代理人 弁理士 岩 佐 義 幸
１５：反射光
第」図
第２図
旧°金反射ミラー
１９、全反引ミう−
第３図
（０） （ｂ）第４図
手続補正占
昭和６３年 ５月 ９日FIG. 1 is a diagram showing a first embodiment of the invention, FIG. 2 is a diagram showing a second embodiment of the invention, FIG. 3 is a diagram showing a third embodiment of the invention, and FIG. 4 is a diagram showing a third embodiment of the invention. Figures (a) and (b) are diagrams for explaining the present invention in detail, and Fig. 5 is a diagram for explaining the invention in detail. 1...Light source 2...Condenser lens 3...Incoming light 4...Polarizing beam splitter 5.6...Total reflection mirror 7...Transmitted light 8.15...Reflected light' 9.10.11.12.13.14...Polarization direction 22...Sheet polarizer agent Patent attorney Yoshiyuki Iwasa 15: Reflected light 'Fig. Figure 2: Old gold reflective mirror 19, fully retracted - Figure 3 (0) (b) Figure 4: Procedural amendment May 9, 1988
Claims (1)
偏光光とＳ−偏光成分の直線偏光光とに空間的分離を行
うための偏光ビームスプリッタと、前記Ｐ−偏光成分の
直線偏光光と前記Ｓ−偏光成分の直線偏光光のどちらか
一方の直線偏光光の偏光方向と、もう一方の直線偏光光
の偏光方向とが等しくなるように、２つの前記直線偏光
光を合成するための、反射法線方向が直交するように配
置した２枚の全反射ミラーを含む少なくとも２枚以上の
全反射ミラーとから構成されることを特徴とする偏光変
換素子。(1) A polarizing beam splitter for spatially separating undefined polarized light from a light source into linearly polarized light mainly having a P-polarized light component and linearly polarized light having an S-polarized light component; The two linearly polarized lights are combined so that the polarization direction of one of the linearly polarized lights of the polarized light and the linearly polarized light of the S-polarized light component is equal to the polarization direction of the other linearly polarized light. 1. A polarization conversion element comprising at least two total reflection mirrors, including two total reflection mirrors arranged such that their reflection normal directions are perpendicular to each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2956287A JPS63197913A (en) | 1987-02-13 | 1987-02-13 | Polarization converting element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2956287A JPS63197913A (en) | 1987-02-13 | 1987-02-13 | Polarization converting element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63197913A true JPS63197913A (en) | 1988-08-16 |
Family
ID=12279574
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2956287A Pending JPS63197913A (en) | 1987-02-13 | 1987-02-13 | Polarization converting element |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63197913A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0422661A2 (en) * | 1989-10-13 | 1991-04-17 | Mitsubishi Rayon Co., Ltd | Polarization forming optical device and polarization beam splitter |
| US5267029A (en) * | 1989-12-28 | 1993-11-30 | Katsumi Kurematsu | Image projector |
| US5295018A (en) * | 1991-03-04 | 1994-03-15 | Hitachi, Ltd. | Polarization transforming optics, polarizing beam splitter and liquid crystal display |
| US5359455A (en) * | 1989-12-26 | 1994-10-25 | Mitsubishi Rayon Co., Ltd. | Polarization forming optical device |
| US5657160A (en) * | 1992-12-03 | 1997-08-12 | Matsushita Electric Industrial Co., Ltd. | Polarization plane rotator applicable to polarization converter and projection display system |
| WO2004077102A3 (en) * | 2003-02-21 | 2005-05-12 | Wavien Inc | Polarization recovery system using redirection |
| US6969177B2 (en) * | 2001-03-23 | 2005-11-29 | Wavien, Inc. | Polarization recovery system using redirection |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59177518A (en) * | 1983-03-29 | 1984-10-08 | Fujitsu Ltd | Rotation system for plane of polarization |
| JPS6190584A (en) * | 1984-10-09 | 1986-05-08 | Sony Corp | Projection-type display device |
-
1987
- 1987-02-13 JP JP2956287A patent/JPS63197913A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59177518A (en) * | 1983-03-29 | 1984-10-08 | Fujitsu Ltd | Rotation system for plane of polarization |
| JPS6190584A (en) * | 1984-10-09 | 1986-05-08 | Sony Corp | Projection-type display device |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0422661A2 (en) * | 1989-10-13 | 1991-04-17 | Mitsubishi Rayon Co., Ltd | Polarization forming optical device and polarization beam splitter |
| US5359455A (en) * | 1989-12-26 | 1994-10-25 | Mitsubishi Rayon Co., Ltd. | Polarization forming optical device |
| US5267029A (en) * | 1989-12-28 | 1993-11-30 | Katsumi Kurematsu | Image projector |
| US5295018A (en) * | 1991-03-04 | 1994-03-15 | Hitachi, Ltd. | Polarization transforming optics, polarizing beam splitter and liquid crystal display |
| US5657160A (en) * | 1992-12-03 | 1997-08-12 | Matsushita Electric Industrial Co., Ltd. | Polarization plane rotator applicable to polarization converter and projection display system |
| US6969177B2 (en) * | 2001-03-23 | 2005-11-29 | Wavien, Inc. | Polarization recovery system using redirection |
| WO2004077102A3 (en) * | 2003-02-21 | 2005-05-12 | Wavien Inc | Polarization recovery system using redirection |
| EP1597514A2 (en) * | 2003-02-21 | 2005-11-23 | Wavien, Inc. | Polarization recovery system using redirection |
| EP1597514A4 (en) * | 2003-02-21 | 2009-08-26 | Wavien Inc | Polarization recovery system using redirection |
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