JPS6449017A - Projection optical system - Google Patents
Projection optical systemInfo
- Publication number
- JPS6449017A JPS6449017A JP62206041A JP20604187A JPS6449017A JP S6449017 A JPS6449017 A JP S6449017A JP 62206041 A JP62206041 A JP 62206041A JP 20604187 A JP20604187 A JP 20604187A JP S6449017 A JPS6449017 A JP S6449017A
- Authority
- JP
- Japan
- Prior art keywords
- light pipe
- projection
- rectangular
- light
- luminous flux
- 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
- Projection Apparatus (AREA)
Abstract
PURPOSE:To effectively utilize luminous flux from a light source by using a light pipe which deforms so that its light incidence surface is circular and its projection surface is rectangular for lighting. CONSTITUTION:The light pipe 4 constitutes a cylinder which has the circular incidence part 31, deforms successively from the circle to the rectangular toward the projection side, and has the rectangular projection part 32. The divergent luminous flux from the light source 1 arranged nearby the focus position of a reflector 2 is converged by the reflector 2 and made incident on the light pipe 2 as nearly parallel light through a condenser lens 3. Then the luminous flux which is made incident on the incidence port of the light pipe 4 is passed through the light pipe 4 while reflected therein, and projected from he rectangular projection port to illuminate a transmission type liquid crystal display panel 5, and an image on a liquid crystal display panel 5 is enlarged by a projection lens 6 and projected on the surface of a screen 7. Thus, the light pipe having the circular incidence port and rectangular projection port is utilized as part of an illumination system to improve the utilization efficiency of the luminous flux.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62206041A JPS6449017A (en) | 1987-08-19 | 1987-08-19 | Projection optical system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62206041A JPS6449017A (en) | 1987-08-19 | 1987-08-19 | Projection optical system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6449017A true JPS6449017A (en) | 1989-02-23 |
Family
ID=16516912
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62206041A Pending JPS6449017A (en) | 1987-08-19 | 1987-08-19 | Projection optical system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6449017A (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0290834U (en) * | 1988-12-30 | 1990-07-18 | ||
JPH03210548A (en) * | 1990-01-16 | 1991-09-13 | Ushio Inc | Projector |
FR2758633A1 (en) * | 1997-01-23 | 1998-07-24 | Thomson Multimedia Sa | Light ray concentrator of specific shape |
US6139156A (en) * | 1997-11-12 | 2000-10-31 | Mitsubishi Denki Kabushiki Kaisha | Light source device and projection type display apparatus |
US6856727B2 (en) * | 2001-03-02 | 2005-02-15 | Wavien, Inc. | Coupling of light from a non-circular light source |
US7120346B2 (en) | 2003-08-21 | 2006-10-10 | Funai Electric Co., Ltd. | Image projector and light tunnel |
US7131735B2 (en) | 1998-06-04 | 2006-11-07 | Seiko Epson Corporation | Light source device, optical device, and liquid-crystal display device |
JP2007311357A (en) * | 1998-06-04 | 2007-11-29 | Seiko Epson Corp | Projector |
-
1987
- 1987-08-19 JP JP62206041A patent/JPS6449017A/en active Pending
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0290834U (en) * | 1988-12-30 | 1990-07-18 | ||
JPH03210548A (en) * | 1990-01-16 | 1991-09-13 | Ushio Inc | Projector |
FR2758633A1 (en) * | 1997-01-23 | 1998-07-24 | Thomson Multimedia Sa | Light ray concentrator of specific shape |
US6139156A (en) * | 1997-11-12 | 2000-10-31 | Mitsubishi Denki Kabushiki Kaisha | Light source device and projection type display apparatus |
US7131735B2 (en) | 1998-06-04 | 2006-11-07 | Seiko Epson Corporation | Light source device, optical device, and liquid-crystal display device |
JP2007311357A (en) * | 1998-06-04 | 2007-11-29 | Seiko Epson Corp | Projector |
US6856727B2 (en) * | 2001-03-02 | 2005-02-15 | Wavien, Inc. | Coupling of light from a non-circular light source |
US7120346B2 (en) | 2003-08-21 | 2006-10-10 | Funai Electric Co., Ltd. | Image projector and light tunnel |
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