JPH061303B2 - Polarized illumination device - Google Patents
Polarized illumination deviceInfo
- Publication number
- JPH061303B2 JPH061303B2 JP59244879A JP24487984A JPH061303B2 JP H061303 B2 JPH061303 B2 JP H061303B2 JP 59244879 A JP59244879 A JP 59244879A JP 24487984 A JP24487984 A JP 24487984A JP H061303 B2 JPH061303 B2 JP H061303B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- polarized
- polarization
- beam splitter
- component
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、例えば投射型デイスプレイ装置の照明装置と
して適用して好適な偏光照明装置に関する。TECHNICAL FIELD The present invention relates to a polarized illumination device suitable for application as, for example, an illumination device of a projection type display device.
投射型デイスプレイ装置として、第３図に示すようにラ
インライトバルブを使用した装置が提案されている。As a projection type display device, a device using a line light valve as shown in FIG. 3 has been proposed.
同図において、(1)は光源で発光部を構成するキセノア
ークランプ(2)及び反射器を構成する球面反射鏡(3)を有
している。球面鏡(3)はキセノンアークランプ(2)の発光
中心を中心とし、例えば可視光を反射し、熱線を通過せ
しめるものとされる。In the figure, (1) has a xeno arc lamp (2) which constitutes a light emitting portion by a light source and a spherical reflecting mirror (3) which constitutes a reflector. The spherical mirror (3) is supposed to center the light emission center of the xenon arc lamp (2), reflect visible light, and pass heat rays.
光源(1)からの光は、熱線を反射し、可視光を通過させ
る熱線反射板(4)を通過してコンデンサレンズ(5)に供給
され、平行光束とされる。このコンデンサレンズ(2)か
らの光は、絞り板(6)を通過して偏光子を構成する偏光
ビームスプリツタ(7)に供給され、所定の偏光面を有す
る偏光、即ちＰ偏光成分LPのみが通過して得られる。こ
の偏光ビームスプリツタ(7)からの偏光は、カマボコ形
レンズ(8)に供給され、水平方向に伸びる細帯状の偏光
断面を有した光束とされた後、透明支持板(9)に支持さ
れたラインライトバルブ(10)に照明光として供給され
る。このラインライトバルブ(10)は、例えばＰＬＺＴ電
気光学セラミツク材よりなり、512光弁で形成され、カ
マボコ形レンズ(8)より供給される細帯状の偏光断面の
光束に対して各光弁部分で夫々所定角度だけ偏光面が回
転させられる。The light from the light source (1) is reflected by heat rays, passes through a heat ray reflection plate (4) that allows visible light to pass through, and is supplied to a condenser lens (5) to be a parallel light flux. The light from the condenser lens (2) passes through the diaphragm plate (6) and is supplied to the polarization beam splitter (7) which constitutes a polarizer, and has a predetermined polarization plane, that is, P polarization component L P Only go through and get. The polarized light from the polarized beam splitter (7) is supplied to the camcorder lens (8) to form a light beam having a strip-shaped polarization section extending in the horizontal direction, and then supported by a transparent support plate (9). The line light valve (10) is supplied as illumination light. This line light valve (10) is made of, for example, a PLZT electro-optical ceramic material, is formed of 512 light valves, and is formed in each light valve portion with respect to the light flux of the strip-shaped polarization cross section supplied from the chamfered lens (8). The plane of polarization is rotated by a predetermined angle.
このラインライトバルブ(10)で所定角度だけ偏光面が回
転させられた光は、縮小レンズ(11)を通過し、垂直方向
に偏向走査せしめる可動ミラー(12)で光路変更された
後、フイールドレンズ(13)を通過して検光子を構成する
偏光ビームスプリツタ(14)に供給され、上述ラインライ
トバルブ(10)における偏光面の回転角度に対応した量だ
け通過させられる。The light whose polarization plane is rotated by a predetermined angle by this line light valve (10) passes through the reduction lens (11), and its optical path is changed by a movable mirror (12) that deflects and scans in the vertical direction. After passing through (13), it is supplied to the polarization beam splitter (14) that constitutes an analyzer, and is passed through by an amount corresponding to the rotation angle of the polarization plane in the above-mentioned line light valve (10).
この偏光ビームスプリツタ(14)からの光は、投射レンズ
(15)でスクリーン（図示せず）に投射される。The light from this polarized beam splitter (14) is projected onto the projection lens.
It is projected on a screen (not shown) at (15).
また、第３図において、(16)は制御回路部で、その入力
端子(16a)には映像信号SVが供給される。そして、ライ
ンライトバルブ(10)の512光弁は、映像信号SVの各水平
期間内の512点のサンプル信号で順次駆動され、夫々の
光弁部分がその信号内容に応じた角度だけの偏光面の回
転を生ぜしめるように、映像信号SVの水平周期に同期し
て制御される。また、ミラー駆動部(17)が制御され、可
動ミラー(12)が映像信号SVの垂直周期に同期して偏光走
査動作を行なうようにされる。Further, in FIG. 3, (16) is a control circuit section, to which an input terminal (16a) is supplied with the video signal S V. Then, the 512 light valves of the line light valve (10) are sequentially driven by the sample signals of 512 points in each horizontal period of the video signal S V , and the respective light valve portions are polarized by an angle corresponding to the signal content. It is controlled in synchronization with the horizontal cycle of the video signal S V so as to cause the rotation of the surface. Further, the mirror driving section (17) is controlled so that the movable mirror (12) performs the polarization scanning operation in synchronization with the vertical cycle of the video signal S V.
以上の構成から、この第３図に示すデイスプレイ装置に
よれば、スクリーン上に映像信号SVによる画像を得るこ
とができる。With the above configuration, the display device shown in FIG. 3 can obtain an image by the video signal S V on the screen.
この第３図に示すデイスプレイ装置においては、光源
(1)からの光のうち、偏光ビームスプリツタ(7)を通過し
て得られるＰ偏光成分LPのみ照明光として利用され、光
源(1)からの光のうちＰ偏光成分LPと直交する偏光面を
有するＳ偏光成分LSは偏光ビームスプリツタ(7)で反射
され、照明光として利用されていない。従つて、この第
３図に示すデイスプレイ装置によれば、光源(1)からの
光の利用率が50％以下と少ない欠点があつた。In the display device shown in FIG. 3, the light source is
Of the light from (1), only the P-polarized component L P obtained by passing through the polarization beam splitter (7) is used as illumination light, and the light from the light source (1) is orthogonal to the P-polarized component L P. The S-polarized component L S having a polarization plane that reflects is reflected by the polarization beam splitter (7) and is not used as illumination light. Therefore, the display device shown in FIG. 3 has a drawback that the utilization rate of the light from the light source (1) is as small as 50% or less.
そこで、本出願人は、先に特願昭59-211843号におい
て、光源からの光の利用率が大幅に改善されるものを提
案した。Therefore, the present applicant previously proposed in Japanese Patent Application No. 59-211843 that the utilization factor of light from the light source is significantly improved.
即ち、第４図において、偏光ビームスプリツタ(7)のＳ
偏光成分LSが反射して得られる側には全反射プリズム(1
8)が配され、Ｓ偏光成分LSはこの全反射プリズム(18)で
直角に反射して、偏光ビームスプリツタ(7)を通過して
得られるＰ偏光成分LPと同一方向に射出される。また、
全反射プリズム(18)の射出側にはλ/2光学位相板(19)が
配され、全反射プリズム(18)より射出されたＳ偏光成分
LSはこのλ/2光学位相板(19)によりその偏光面が90゜回
転され、Ｐ偏光成分LP *に変換される。また、偏光ビー
ムスプリツタ(7)及びλ/2光学位相板(19)の前面には夫
々光路変更用のクサビ形レンズ（プリズム）(20)及び(2
1)が配され、変更ビームスプリツタ(7)を通過して得ら
れるＰ偏光成分LP及びλ/2光学位相板(19)で変換された
Ｐ偏光成分LP *は夫々光路変更され、所定位置POで一致
するように合成される。That is, in FIG. 4, S of the polarized beam splitter (7)
On the side where the polarization component L S is obtained by reflecting the total reflection prism (1
8) is arranged, and the S-polarized component L S is reflected at a right angle by this total reflection prism (18) and is emitted in the same direction as the P-polarized component L P obtained by passing through the polarization beam splitter (7). It Also,
The λ / 2 optical phase plate (19) is arranged on the exit side of the total reflection prism (18), and the S-polarized component emitted from the total reflection prism (18)
The plane of polarization of L S is rotated by 90 ° by this λ / 2 optical phase plate (19), and converted into P polarization component L P * . Further, on the front surfaces of the polarization beam splitter (7) and the λ / 2 optical phase plate (19), wedge-shaped lenses (prisms) (20) and (2
1) is arranged, and the P-polarized component L P obtained by passing through the modified beam splitter (7) and the P-polarized component L P * converted by the λ / 2 optical phase plate (19) have their optical paths changed, They are combined so that they match at a predetermined position P O.
また、ラインライトバルブ(10)は、所定位置POより手前
に配され、さらに、このラインライトバルブ(10)の手前
にカマボコ形レンズ(8)が配される。そして、Ｐ変更成
分LP及びLP *の合成光は、カマボコ形レンズ(8)で水平方
向に伸びる細帯状の偏光断面を有した光束とされて、ラ
インライトバルブ(10)に照明光として供給される。Further, the line light valve (10) is arranged in front of the predetermined position P O , and further, the chamfered lens (8) is arranged in front of the line light valve (10). Then, the combined light of the P-modifying components L P and L P * is made into a light beam having a narrow strip-shaped polarization section extending in the horizontal direction by the chamfered lens (8) and used as illumination light for the line light valve (10). Supplied.
この第４図例のように構成されるものによれば、偏光ビ
ームスプリツタより得られるＳ偏光成分LS及びＰ偏光成
分LPの双方ともラインライトバルブ(10)の照明光として
利用されるので、光源(1)からの光の利用率が改善され
る。According to the structure shown in FIG. 4, both the S-polarized component L S and the P-polarized component L P obtained from the polarized beam splitter are used as the illumination light of the line light valve (10). Therefore, the utilization rate of the light from the light source (1) is improved.
第４図例に示すものは、このように光源(1)からの光の
利用率が改善されるが、次のような問題がある。即ち、
偏光ビームスプリツタ(7)を通過して得られるＰ偏光成
分LP及び変換されたＰ偏光成分LP *の光軸が一致しない
ため、両者の合成面で互いに光軸が斜交し、完全な平行
照明化ができなく、光学パスが長い場合は使い難い面が
ある。The example shown in FIG. 4 improves the utilization factor of the light from the light source (1) in this way, but has the following problems. That is,
Since the polarizing beam splitter (7) P-polarized component L P * of the optical axis which is P-polarized component L P and converting obtained through the mismatch, obliquely intersects the optical axis together with the synthesis surface of both full It is difficult to use when parallel illumination is not possible and the optical path is long.
本発明は、斯る点に鑑み、完全な平行照明化が可能とな
るようにしたものである。In view of such a point, the present invention enables perfect parallel illumination.
本発明は上述問題点を解決するため、透明発光体及びこ
の透明発光体を中心とする球面反射鏡(3)またはだ円面
反射鏡よりなる光源(1)からの光が平行化レンズにより
平行化され、この平行光が、偏光面をπ/4回転させるλ
/4光学位相板(23)を介して偏光ビームスプリツタ(7)に
供給されると共に、この偏光ビームスプリツタ(7)より
得られるＳ偏光成分またはＰ偏光成分の一方の進行方向
が平面反射鏡(22)により反転され、この偏光ビームスプ
リツタ(7)より得られるＳ偏光成分またはＰ偏光成分の
他方が照明光とされるものである。例えば、透明発光体
としてはキセノンアークランプ(2)が使用され、平行化
レンズとしてはコンデンサレンズ(5)が使用される。In order to solve the above problems, the present invention provides a transparent illuminator and a light source (1) consisting of a spherical reflecting mirror (3) or an elliptical reflecting mirror centering on the transparent illuminating body, which is collimated by a collimating lens. And this parallel light rotates the plane of polarization by π / 4 λ
Is supplied to the polarized beam splitter (7) through the / 4 optical phase plate (23), and the traveling direction of one of the S-polarized component or the P-polarized component obtained from the polarized beam splitter (7) is plane reflected. The other of the S-polarized light component and the P-polarized light component which is inverted by the mirror (22) and obtained from the polarized beam splitter (7) is used as illumination light. For example, a xenon arc lamp (2) is used as the transparent light emitter, and a condenser lens (5) is used as the collimating lens.
平面反射鏡(22)でその進行方向が反転される偏光ビーム
スプリツタ7より得られるＳ偏光成分またはＰ偏光成分
の一方は、偏光ビームスプリツタ(7)と光源(1)との間で
１往復して、再び偏光ビームスプリツタ(7)に供給され
る。この場合、λ/4光学位相板(23)を２度通過してその
偏光面はπ/2だけ回転させられ、Ｓ偏光成分またはＰ偏
光成分は夫々Ｐ偏光成分またはＳ偏光成分に変換される
ので、再び偏光ビームスプリツタ(7)に供給されるとき
は、Ｓ偏光成分またはＰ偏光成分の他方の偏光面を同じ
くして同光軸で合成される。そして、この合成光が照明
光となる。One of the S-polarized component and the P-polarized component obtained from the polarized beam splitter 7 whose traveling direction is reversed by the plane reflecting mirror (22) is 1 between the polarized beam splitter (7) and the light source (1). It reciprocates and is supplied again to the polarized beam splitter (7). In this case, the plane of polarization is rotated by π / 2 after passing through the λ / 4 optical phase plate (23) twice, and the S polarization component or the P polarization component is converted into the P polarization component or the S polarization component, respectively. Therefore, when it is supplied to the polarized beam splitter (7) again, the other polarization planes of the S-polarized component and the P-polarized component are made the same and are combined on the same optical axis. Then, this combined light becomes illumination light.
以下、第１図を参照しながら本発明の一実施例について
説明しよう。この第１図において、第４図と対応する部
分には同一符号を付し、その詳細説明は省略する。An embodiment of the present invention will be described below with reference to FIG. In FIG. 1, parts corresponding to those in FIG. 4 are designated by the same reference numerals, and detailed description thereof will be omitted.
本例においては、偏光ビームスプリツタ(7)のＳ偏光成
分LSが反射して得られる側に平面反射鏡(22)が配され、
このＳ偏光成分LSの進行方向はこの反射鏡(22)により反
転される。In this example, the plane reflecting mirror (22) is arranged on the side obtained by reflecting the S-polarized component L S of the polarized beam splitter (7),
The traveling direction of the S-polarized component L S is reversed by the reflecting mirror (22).
また、光源(1)と偏光ビームスプリツタ(7)との間本例に
おいては偏光ビームスプリツタ(7)の直前にλ/4光学位
相板(23)が配される。この位相板(23)は、偏光面をπ/4
回転させるものであり、これを往復通過することにより
π/2だけ偏光面が回転させられる。Further, between the light source (1) and the polarized beam splitter (7), in this example, a λ / 4 optical phase plate (23) is arranged immediately before the polarized beam splitter (7). This phase plate (23) has a polarization plane of π / 4.
It is rotated, and by passing it back and forth, the plane of polarization is rotated by π / 2.
本例は以上のように構成され、その他は第４図例と同様
に構成される。The present example is configured as described above, and the others are configured similarly to the example of FIG.
本例においては、反射鏡(22)でその進行方向が反転され
たＳ偏光成分LSは、第１図に一点鎖線で示すように、偏
光ビームスプリツタ(7)で直角に反射された後、位相板
(23)→絞り板(6)→コンデンサレンズ(5)→熱線反射板
(4)→キセノンアークランプ(2)の発光中心を通過して球
面反射鏡(3)に供給される。そして、この球面反射鏡(3)
で反射された後、同図２点鎖線で示すようにキセノンア
ークランプ(2)の発光中心→熱線反射板(4)→コンデンサ
レンズ(5)→絞り板(6)→位相板(23)を通過して偏光ビー
ムスプリツタ(7)に再び供給される。この場合、Ｓ偏光
成分LSは位相板(23)を往復通過することになるので、そ
の偏光面はπ/2だけ回転させられ、Ｐ偏光成分LP *に変
換される。In this example, the S-polarized component L S whose traveling direction is reversed by the reflecting mirror (22) is reflected at a right angle by the polarization beam splitter (7) as shown by the alternate long and short dash line in FIG. , Phase plate
(23) → diaphragm plate (6) → condenser lens (5) → heat ray reflector
(4) → Passes through the emission center of the xenon arc lamp (2) and is supplied to the spherical reflecting mirror (3). And this spherical reflector (3)
After being reflected by, the emission center of the xenon arc lamp (2) → heat ray reflection plate (4) → condenser lens (5) → diaphragm plate (6) → phase plate (23) It passes and is supplied again to the polarized beam splitter (7). In this case, since the S-polarized component L S passes through the phase plate (23) back and forth, its polarization plane is rotated by π / 2 and converted into the P-polarized component L P * .
この変換されたＰ偏光成分ＬP *は偏光ビームスプリツタ
(7)を直進し、Ｐ偏光成分LPと同光軸で合成されて、カ
マボコ形レンズ(8)に供給され、水平方向に伸びる細帯
状の偏光断面を有した光束とされて、ラインライトバル
ブ(10)に照明光として供給される。This converted P-polarized component L P * is the polarized beam splitter.
Go straight through (7), are combined with the P-polarized component L P on the same optical axis, and are supplied to the semi-cylindrical lens (8) to be a light beam having a horizontally extending strip-shaped polarization section, and a line light It is supplied as illumination light to the bulb (10).
このように本例によれば、偏光ビームスプリツタ(7)よ
り得られるＳ偏光成分LS及びＰ偏光成分LPの双方とも照
明光として利用されるので、第４図例と同様に光源(1)
からの光の利用率が改善される。そして、特に本例によ
ればＰ偏光成分LPに合成される変換されたＰ偏光成分LP
*の光軸が一致したものとなるので、完全な平行照明化
が可能で、光学パスが長い場合にも良好に使用すること
ができる。As described above, according to this example, since both the S-polarized component L S and the P-polarized component L P obtained from the polarized beam splitter (7) are used as illumination light, the light source ( 1)
The utilization of light from is improved. Then, in particular, according to this example, the converted P-polarized component L P is combined with the P-polarized component L P.
Since the optical axes of * are the same, perfect parallel illumination is possible and it can be used well even when the optical path is long.
尚、上述実施例における偏光ビームスプリツタ(7)の代
りに、第２図に示すようなグラン・トムソン偏光子(24)
を用いてもよい。同図において、破線図示は変形したも
のを示している。Incidentally, instead of the polarized beam splitter (7) in the above-mentioned embodiment, a Glan-Thomson polarizer (24) as shown in FIG. 2 is used.
May be used. In the figure, the broken line shows the modified one.
また、上述実施例は発光部としてキセノンアークランプ
(2)を用いたものであるが、その他の透明発光体でもよ
い。また反射器として球面反射鏡(3)を用いたものであ
るが、だ円面反射鏡でよい。In addition, in the above-described embodiment, a xenon arc lamp is used as the light emitting unit.
Although (2) is used, other transparent luminescent materials may be used. The spherical reflector (3) is used as the reflector, but an ellipsoidal reflector may be used.
また、上述実施例はカマボコ形レンズ(8)により細帯状
の偏光断面を有した光束として照明する例であるが、例
えば二次元のライトバルブを照明するときは、カマボコ
形レンズを用いずにそのまま面照明すればよい。また、
上述実施例は、電気光学素子によりなるライトバルブ(1
0)を使用した例であるが、液晶よりなるライトバルブを
使用するものにも同様に適用することができる。また、
上述実施例は、偏光ビームスプリツタ(7)より得られる
Ｓ偏光成分LSの偏光面を90゜回転させＰ偏光成分の合成
光としたものであるが、この逆の場合も同様に考えるこ
とができる。Further, the above-mentioned embodiment is an example of illuminating as a light flux having a strip-shaped polarization cross section by the cambolic lens (8), but when illuminating a two-dimensional light valve, for example, it is used as it is without using a cambolic lens. Surface lighting is sufficient. Also,
In the above embodiment, the light valve (1
This is an example using 0), but it can be similarly applied to the one using a light valve made of liquid crystal. Also,
In the above-mentioned embodiment, the polarization plane of the S-polarized component L S obtained from the polarized beam splitter (7) is rotated by 90 ° to make a combined light of the P-polarized component, but the reverse case should also be considered. You can
以上述べた本発明によれば、合成される偏光成分の光軸
が一致したものとなるので、完全な平行照明化が可能と
なり、光学パスが長い場合にも良好に使用することがで
きる。According to the present invention described above, since the optical axes of the polarized components to be combined coincide with each other, perfect parallel illumination is possible, and it can be favorably used even when the optical path is long.
第１図は本発明の一実施例を示す構成図、第２図は本発
明の他の実施例を示す構成図、第３図はデイスプレイ装
置の一例を示す構成図、第４図は従来例を示す構成図で
ある。 (1)は光源、(2)はキセノンアークランプ、(3)は球面反
射鏡、(5)はコンデンサレンズ、(7)は偏光ビームスプリ
ツタ、(22)は平面反射鏡、(23)はλ/4光学位相板であ
る。1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a block diagram showing another embodiment of the present invention, FIG. 3 is a block diagram showing an example of a display device, and FIG. 4 is a conventional example. It is a block diagram which shows. (1) is a light source, (2) is a xenon arc lamp, (3) is a spherical reflecting mirror, (5) is a condenser lens, (7) is a polarized beam splitter, (22) is a flat reflecting mirror, and (23) is It is a λ / 4 optical phase plate.
Claims (1)
る球面またはだ円面反射鏡よりなる光源と、この光源か
らの光を平行光化する平行化レンズと、この平行化レン
ズからの平行光が供給される偏光ビームスプリツタと、
上記平行化レンズ及び偏光ビームスプリツタ間に配され
偏光面をπ/4回転させるλ/4光学位相板と、上記偏光ビ
ームスプリツタより得られるＳ偏光成分またはＰ偏光成
分の一方の進行方向を反転させる平行反射鏡とを有して
なり、上記偏光ビームスプリツタより得られるＳ偏光成
分またはＰ偏光成分の他方の照明光とされることを特徴
とする偏光照明装置。1. A light source comprising a transparent light-emitting body and a spherical or elliptical reflecting mirror having the transparent light-emitting body as a center, a collimating lens for collimating light from the light source, and a collimating lens for collimating the light. A polarized beam splitter to which parallel light is supplied,
A λ / 4 optical phase plate arranged between the collimating lens and the polarization beam splitter to rotate the plane of polarization by π / 4, and one traveling direction of the S polarization component or the P polarization component obtained from the polarization beam splitter A polarized light illuminating device comprising: a parallel reflecting mirror for inverting; and the other illuminating light of the S-polarized component or the P-polarized component obtained from the polarized beam splitter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59244879A JPH061303B2 (en) | 1984-11-20 | 1984-11-20 | Polarized illumination device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59244879A JPH061303B2 (en) | 1984-11-20 | 1984-11-20 | Polarized illumination device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61122626A JPS61122626A (en) | 1986-06-10 |
| JPH061303B2 true JPH061303B2 (en) | 1994-01-05 |
Family
ID=17125352
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59244879A Expired - Fee Related JPH061303B2 (en) | 1984-11-20 | 1984-11-20 | Polarized illumination device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH061303B2 (en) |
Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63168626A (en) * | 1987-01-06 | 1988-07-12 | Citizen Watch Co Ltd | Liquid crystal display body |
| US4913529A (en) * | 1988-12-27 | 1990-04-03 | North American Philips Corp. | Illumination system for an LCD display system |
| JPH02308106A (en) * | 1989-05-23 | 1990-12-21 | Citizen Watch Co Ltd | Linear polarizing light source |
| JPH03175412A (en) * | 1989-12-05 | 1991-07-30 | Victor Co Of Japan Ltd | Polarization converting element |
| JPH052150A (en) * | 1991-06-24 | 1993-01-08 | Nippon Avionics Co Ltd | Polarized light source device |
| FR2669127B1 (en) * | 1990-11-09 | 1993-01-22 | Thomson Csf | TWO-BEAM POLARIZED IMAGE PROJECTOR BY MATRIX SCREEN. |
| US5387953A (en) * | 1990-12-27 | 1995-02-07 | Canon Kabushiki Kaisha | Polarization illumination device and projector having the same |
| US5223956A (en) * | 1992-03-30 | 1993-06-29 | Holotek Ltd. | Optical beam scanners for imaging applications |
| FR2693561B1 (en) * | 1992-07-10 | 1994-09-30 | Alphaprime | Polarized light source and overhead projector using this source. |
| US5428469A (en) * | 1993-11-16 | 1995-06-27 | Minnesota Mining And Manufacturing Company | Liquid crystal display projection systems employing polarizing beam splitters and passing light through display cell from both directions |
| US5995284A (en) * | 1996-03-29 | 1999-11-30 | 3M Innovative Properties Company | Polarized illumination system for LCD projector |
| JP3595142B2 (en) * | 1997-12-22 | 2004-12-02 | シチズン時計株式会社 | Linear polarized light source |
| US6108131A (en) * | 1998-05-14 | 2000-08-22 | Moxtek | Polarizer apparatus for producing a generally polarized beam of light |
| JP2005326575A (en) * | 2004-05-13 | 2005-11-24 | Ricoh Co Ltd | Polarization rotation element, polarization converting element, lighting device and image display apparatus |
| US9632223B2 (en) | 2013-10-24 | 2017-04-25 | Moxtek, Inc. | Wire grid polarizer with side region |
-
1984
- 1984-11-20 JP JP59244879A patent/JPH061303B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61122626A (en) | 1986-06-10 |
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| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |