JPH02308106A - Linear polarizing light source - Google Patents
Linear polarizing light sourceInfo
- Publication number
- JPH02308106A JPH02308106A JP1129494A JP12949489A JPH02308106A JP H02308106 A JPH02308106 A JP H02308106A JP 1129494 A JP1129494 A JP 1129494A JP 12949489 A JP12949489 A JP 12949489A JP H02308106 A JPH02308106 A JP H02308106A
- Authority
- JP
- Japan
- Prior art keywords
- polarized light
- light source
- polarizing element
- linear polarizing
- mirror
- 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
- 230000003287 optical effect Effects 0.000 claims abstract description 4
- 230000010287 polarization Effects 0.000 claims abstract description 4
- 230000005540 biological transmission Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 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
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
Landscapes
- Liquid Crystal (AREA)
- Polarising Elements (AREA)
Abstract
Description
【発明の詳細な説明】 〔産業上の利用分野〕 直線偏光光源は例えば液晶表示素子に用いられている。[Detailed description of the invention] [Industrial application field] Linearly polarized light sources are used, for example, in liquid crystal display devices.
液晶表示素子は低消費電力のフラットパネルディスプレ
イやプロジェクション用のライトパルプとして広く応用
されている。本発明は偏光としてはう１ンダムな光源か
ら１種類の直線偏光を非常に高効率に出射する直線偏光
光源に関する。Liquid crystal display elements are widely used as light pulp for low power consumption flat panel displays and projection. The present invention relates to a linearly polarized light source that emits one type of linearly polarized light from a random light source with extremely high efficiency.
第４図に従来の直線偏光光源を示す。１は偏光としては
ランダムな光源、２は光源１の背後に設けられたミラー
、２２は光源１の前方に設けられた直線偏光素子である
。直線偏光素子２２は一方の偏光２０のみ透過し他の一
方の偏光２１は吸収する。FIG. 4 shows a conventional linearly polarized light source. Reference numeral 1 indicates a light source with random polarization, 2 a mirror provided behind the light source 1, and 22 a linear polarizing element provided in front of the light source 1. The linear polarizing element 22 transmits only one polarized light 20 and absorbs the other polarized light 21.
この様な直線偏光光源はランダムな偏光のうち半分の偏
光しか利用できず残りの半分は捨ててしまりており効率
が悪い。Such a linearly polarized light source is inefficient because it can only utilize half of the randomly polarized light and discards the other half.
本発明は従来の直線偏光光源の効率の飛躍的な向上を目
的とする。The present invention aims to dramatically improve the efficiency of conventional linearly polarized light sources.
本発明は、直線偏光素子としては一方の偏光を透過し他
の一方の偏光を反射する反射型直線偏光素子を用い、該
反射型直線偏光素子とミラーとの間に位相差板を配置す
る事により、ランダムな偏光を持つ光源の光を非常に高
効率に１種類の偏光に変換するものである。The present invention uses a reflective linear polarizing element that transmits one polarized light and reflects the other polarized light as the linear polarizing element, and arranges a retardation plate between the reflective linear polarizing element and the mirror. This converts randomly polarized light from a light source into one type of polarized light with extremely high efficiency.
以下、実施例に基づき本発明を説明する。第１図は本発
明の１実施例を示す説明図である。４は光源の前方に設
けられた反射型直線偏光素子である。本発明の特徴は該
反射型直線偏光素子４とミラー２の間に位相差板３を配
置している事にある。The present invention will be explained below based on Examples. FIG. 1 is an explanatory diagram showing one embodiment of the present invention. 4 is a reflective linear polarizing element provided in front of the light source. A feature of the present invention is that a retardation plate 3 is disposed between the reflective linear polarizing element 4 and the mirror 2.
本発明の詳細な説明する。一方の偏光１０は反射型直線
偏光素子４を通過する。他の一方の偏光１１は反射型直
線偏光素子４によって１２の如（反射され位相差板３を
通過し横円偏光１６となる。The present invention will be described in detail. One polarized light 10 passes through the reflective linear polarizing element 4 . The other polarized light 11 is reflected by the reflective linear polarizing element 4 as shown in 12, passes through the retardation plate 3, and becomes horizontally circularly polarized light 16.
楕円偏光１３はミラー２で反射し逆回りの楕円偏光１４
となり再び位相差板６を通過し、偏光１０と同じ成分を
有する偏光１５となり非常に高効率に反射型直線偏光素
子４を通過する。Elliptically polarized light 13 is reflected by mirror 2 and becomes elliptically polarized light 14 in the opposite direction.
Then, the light passes through the retardation plate 6 again, becomes polarized light 15 having the same component as the polarized light 10, and passes through the reflective linear polarizing element 4 with very high efficiency.
位相差板３は可視光に対しほぼ４分の１波長の位相差を
生ずる位相差板であり、その光学軸は反射壁直線偏光素
子４の偏光軸に対しほぼ４５度の角度に設置された時に
該直線偏光光源の効率が最大となり、ランダムな偏光光
源の光をほぼ１００％の効率で１種類の偏光に変換でき
る。The retardation plate 3 is a retardation plate that generates a phase difference of approximately 1/4 wavelength with respect to visible light, and its optical axis is set at an angle of approximately 45 degrees with respect to the polarization axis of the reflective wall linear polarizer 4. At times, the efficiency of the linearly polarized light source is at its maximum, and the light from the randomly polarized light source can be converted into one type of polarized light with almost 100% efficiency.
第３図は反射型直線偏光素子４である。数千オングスト
ロームのピッチでアルミ、クロム等の導電性の金属線状
パタン４１とすると、線方向の直線偏光は反射し、それ
と垂直方向の直線偏光は透過する反射型の直線偏光素子
が得られる。FIG. 3 shows a reflective linear polarizing element 4. If conductive metal linear patterns 41 made of aluminum, chromium, etc. are formed at a pitch of several thousand angstroms, a reflective linear polarizing element is obtained that reflects linearly polarized light in the linear direction and transmits linearly polarized light in the direction perpendicular to the linearly polarized light.
第２図は本発明の他の実施例を示す説明図である。本実
施例の特徴はミラー２が楕円面の少な（とも１部の曲面
を用いた楕円ミラーであり、光源１は該楕円の１つの焦
点３２付近に配置され、反射型直線偏光素子４は該楕円
の２つの焦点６２．６３０間に配置されている事にある
一０本実施例では光源１の光はほぼすべて１種類の直線
偏光として反射型直線偏光素子４を通過し更に焦点６６
を通過する。よって焦点６３を疑似点光源とみなした高
効率直線偏光光源とみる事ができる。レンズ３１を焦点
が楕円焦点３３となるよ５に配置すれば、非常に高効率
の平行直線偏光光源が得られる。FIG. 2 is an explanatory diagram showing another embodiment of the present invention. The feature of this embodiment is that the mirror 2 is an elliptical mirror with a small number of ellipsoidal surfaces (one part of which is curved), the light source 1 is placed near the focal point 32 of one of the ellipses, and the reflective linear polarizing element 4 is In this embodiment, almost all of the light from the light source 1 passes through the reflective linear polarizing element 4 as one type of linearly polarized light, and further passes through the reflective linear polarizing element 4, which is located between the two focal points 62 and 630 of the ellipse.
pass through. Therefore, it can be regarded as a highly efficient linearly polarized light source with the focal point 63 regarded as a pseudo point light source. By arranging the lens 31 so that its focal point is an elliptical focal point 33, a very highly efficient parallel linearly polarized light source can be obtained.
以上の実施例で明らかな如（、本発明の効果は従来捨て
ていた他の一方の偏光も利用する事を可能とし、従来に
ない高効率の直線偏光光源を提供する。As is clear from the above embodiments, the effect of the present invention is to make it possible to utilize the other polarized light, which was conventionally discarded, and to provide a linearly polarized light source with unprecedented high efficiency.
第１図、第２図はそれぞれ本発明の実施例°を示す説明
図、第３図は反射型直線偏光素子を示す説明図、第４図
は従来の直線偏光光源を示す説明図であるう
１・・・・・・光源、 ２・・・・・・ミラ
ー、６・・・・・・位相差板、４・・・・・・反射型直
線偏光素子。
７１陀＼
第３図FIGS. 1 and 2 are explanatory views showing embodiments of the present invention, FIG. 3 is an explanatory view showing a reflective linear polarizing element, and FIG. 4 is an explanatory view showing a conventional linearly polarized light source. DESCRIPTION OF SYMBOLS 1...Light source, 2...Mirror, 6...Retardation plate, 4...Reflection type linear polarizing element. 71 ＼ Figure 3
Claims (3)
の前方に設けられた直線偏光素子を有する偏光光源に於
いて、該直線偏光素子は一方の偏光を透過し他の一方の
偏光を反射する反射型直線偏光素子であり、該反射型直
線偏光素子とミラーとの間に位相差板を配置した事を特
徴とする直線偏光光源。(1) In a polarized light source that includes a light source, a mirror provided behind the light source, and a linear polarizing element provided in front of the light source, the linear polarizing element transmits one polarized light and transmits the other polarized light. What is claimed is: 1. A linearly polarized light source comprising: a reflective linearly polarizing element that reflects light; and a retardation plate disposed between the reflective linearly polarizing element and a mirror.
差を生ずる位相差板であり、その光学軸は反射型直線偏
光素子の偏光軸に対しほぼ４５度の角度に設置された事
を特徴とする請求項１記載の直線偏光光源。(2) The retardation plate is a retardation plate that generates a phase difference of approximately 1/4 wavelength for visible light, and its optical axis is set at an angle of approximately 45 degrees with respect to the polarization axis of the reflective linear polarizer. The linearly polarized light source according to claim 1, characterized in that:
楕円ミラーであり、光源は楕円ミラーの該楕円の１つの
焦点付近に配置され、反射型直線偏光素子は該楕円ミラ
ーの楕円の２つの焦点の間に配置されている事を特徴と
する請求項１記載の直線偏光光源。(3) The mirror is an elliptical mirror using a curved surface of at least a part of the ellipsoidal surface, the light source is placed near the focal point of one of the ellipses of the ellipsoidal mirror, and the reflective linear polarizing element is located near the focal point of one of the ellipses of the ellipsoidal mirror. 2. The linearly polarized light source according to claim 1, wherein the linearly polarized light source is arranged between two focal points.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1129494A JPH02308106A (en) | 1989-05-23 | 1989-05-23 | Linear polarizing light source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1129494A JPH02308106A (en) | 1989-05-23 | 1989-05-23 | Linear polarizing light source |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP35287097A Division JP3595142B2 (en) | 1997-12-22 | 1997-12-22 | Linear polarized light source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02308106A true JPH02308106A (en) | 1990-12-21 |
Family
ID=15010867
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1129494A Pending JPH02308106A (en) | 1989-05-23 | 1989-05-23 | Linear polarizing light source |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02308106A (en) |
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5751388A (en) * | 1995-04-07 | 1998-05-12 | Honeywell Inc. | High efficiency polarized display |
| JPH10162619A (en) * | 1997-12-22 | 1998-06-19 | Citizen Watch Co Ltd | Liquid crystal display device and its polarizing light source |
| WO1999004314A1 (en) * | 1997-07-18 | 1999-01-28 | Citizen Watch Co., Ltd. | Liquid crystal display panel |
| US6088159A (en) * | 1996-07-31 | 2000-07-11 | Weber; Michael F. | Reflective polarizers having extended red band edge for controlled off axis color |
| JP2002514778A (en) * | 1998-05-14 | 2002-05-21 | モックステク | Polarizer device for producing a generally polarized light beam |
| JP2002514781A (en) * | 1998-05-14 | 2002-05-21 | モックステク | Polarizer device for producing a generally polarized light beam |
| JP2002196148A (en) * | 1991-06-13 | 2002-07-10 | Minnesota Mining & Mfg Co <3M> | Retroreflective polarizer |
| JP2003107402A (en) * | 2001-07-26 | 2003-04-09 | Seiko Epson Corp | Stereoscopic display device and projection type stereoscopic display device |
| US6891584B1 (en) | 1998-10-28 | 2005-05-10 | Dai Nippon Printing Co., Ltd. | Liquid-crystal display |
| US7038745B2 (en) | 1993-12-21 | 2006-05-02 | 3M Innovative Properties Company | Brightness enhancing reflective polarizer |
| US7630133B2 (en) | 2004-12-06 | 2009-12-08 | Moxtek, Inc. | Inorganic, dielectric, grid polarizer and non-zero order diffraction grating |
| JP2010537275A (en) * | 2007-08-14 | 2010-12-02 | タイコ・エレクトロニクス・コーポレイション | Touch screen using oriented micro linear conductive elements |
| US8873144B2 (en) | 2011-05-17 | 2014-10-28 | Moxtek, Inc. | Wire grid polarizer with multiple functionality sections |
| US8913321B2 (en) | 2010-09-21 | 2014-12-16 | Moxtek, Inc. | Fine pitch grid polarizer |
| US8913320B2 (en) | 2011-05-17 | 2014-12-16 | Moxtek, Inc. | Wire grid polarizer with bordered sections |
| US8922890B2 (en) | 2012-03-21 | 2014-12-30 | Moxtek, Inc. | Polarizer edge rib modification |
| US9632223B2 (en) | 2013-10-24 | 2017-04-25 | Moxtek, Inc. | Wire grid polarizer with side region |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5681813A (en) * | 1979-12-08 | 1981-07-04 | Nippon Telegr & Teleph Corp <Ntt> | Mask lighting optical system |
| JPS58160914A (en) * | 1982-03-18 | 1983-09-24 | Nippon Kogaku Kk <Nikon> | Mirror converging type optical illumination system |
| JPS61122626A (en) * | 1984-11-20 | 1986-06-10 | Sony Corp | Polarized light illuminating device |
| JPH02264904A (en) * | 1989-04-06 | 1990-10-29 | Nec Corp | Light source for linearly polarized light |
-
1989
- 1989-05-23 JP JP1129494A patent/JPH02308106A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5681813A (en) * | 1979-12-08 | 1981-07-04 | Nippon Telegr & Teleph Corp <Ntt> | Mask lighting optical system |
| JPS58160914A (en) * | 1982-03-18 | 1983-09-24 | Nippon Kogaku Kk <Nikon> | Mirror converging type optical illumination system |
| JPS61122626A (en) * | 1984-11-20 | 1986-06-10 | Sony Corp | Polarized light illuminating device |
| JPH02264904A (en) * | 1989-04-06 | 1990-10-29 | Nec Corp | Light source for linearly polarized light |
Cited By (26)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002196148A (en) * | 1991-06-13 | 2002-07-10 | Minnesota Mining & Mfg Co <3M> | Retroreflective polarizer |
| JP2004078234A (en) * | 1991-06-13 | 2004-03-11 | 3M Co | Retroreflective polarizer |
| US7423708B2 (en) | 1993-12-21 | 2008-09-09 | 3M Innovative Properties Company | Display having a reflective polarizer |
| US7038745B2 (en) | 1993-12-21 | 2006-05-02 | 3M Innovative Properties Company | Brightness enhancing reflective polarizer |
| US5751388A (en) * | 1995-04-07 | 1998-05-12 | Honeywell Inc. | High efficiency polarized display |
| US5999239A (en) * | 1995-04-07 | 1999-12-07 | Honeywell Inc. | Method for making a polarization-sensitive optical element |
| US6449092B1 (en) | 1996-07-31 | 2002-09-10 | 3M Innovative Propertiescompany | Reflective polarizers having extended red band edge for reduced off axis color |
| US6088159A (en) * | 1996-07-31 | 2000-07-11 | Weber; Michael F. | Reflective polarizers having extended red band edge for controlled off axis color |
| US6317181B1 (en) | 1997-07-18 | 2001-11-13 | Citizen Watch Co., Ltd. | Liquid crystal display panel |
| WO1999004314A1 (en) * | 1997-07-18 | 1999-01-28 | Citizen Watch Co., Ltd. | Liquid crystal display panel |
| JPH10162619A (en) * | 1997-12-22 | 1998-06-19 | Citizen Watch Co Ltd | Liquid crystal display device and its polarizing light source |
| JP2002514781A (en) * | 1998-05-14 | 2002-05-21 | モックステク | Polarizer device for producing a generally polarized light beam |
| JP2002514778A (en) * | 1998-05-14 | 2002-05-21 | モックステク | Polarizer device for producing a generally polarized light beam |
| US6891584B1 (en) | 1998-10-28 | 2005-05-10 | Dai Nippon Printing Co., Ltd. | Liquid-crystal display |
| US7206041B2 (en) | 1998-10-28 | 2007-04-17 | Dai Nippon Printing Co., Ltd. | Liquid-crystal display |
| US7405780B2 (en) | 1998-10-28 | 2008-07-29 | Dai Nippon Printing Co., Ltd. | Liquid-crystal display |
| US7623201B2 (en) | 1998-10-28 | 2009-11-24 | Dai Nippon Printing Co., Ltd. | Liquid-crystal display |
| US7932971B2 (en) | 1998-10-28 | 2011-04-26 | Dai Nippon Printing Co., Ltd. | Liquid-crystal display |
| JP2003107402A (en) * | 2001-07-26 | 2003-04-09 | Seiko Epson Corp | Stereoscopic display device and projection type stereoscopic display device |
| US7630133B2 (en) | 2004-12-06 | 2009-12-08 | Moxtek, Inc. | Inorganic, dielectric, grid polarizer and non-zero order diffraction grating |
| JP2010537275A (en) * | 2007-08-14 | 2010-12-02 | タイコ・エレクトロニクス・コーポレイション | Touch screen using oriented micro linear conductive elements |
| US8913321B2 (en) | 2010-09-21 | 2014-12-16 | Moxtek, Inc. | Fine pitch grid polarizer |
| US8873144B2 (en) | 2011-05-17 | 2014-10-28 | Moxtek, Inc. | Wire grid polarizer with multiple functionality sections |
| US8913320B2 (en) | 2011-05-17 | 2014-12-16 | Moxtek, Inc. | Wire grid polarizer with bordered sections |
| US8922890B2 (en) | 2012-03-21 | 2014-12-30 | Moxtek, Inc. | Polarizer edge rib modification |
| US9632223B2 (en) | 2013-10-24 | 2017-04-25 | Moxtek, Inc. | Wire grid polarizer with side region |
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