JPS6450037A - Reflection type enlarging and projecting device - Google Patents
Reflection type enlarging and projecting deviceInfo
- Publication number
- JPS6450037A JPS6450037A JP62207317A JP20731787A JPS6450037A JP S6450037 A JPS6450037 A JP S6450037A JP 62207317 A JP62207317 A JP 62207317A JP 20731787 A JP20731787 A JP 20731787A JP S6450037 A JPS6450037 A JP S6450037A
- Authority
- JP
- Japan
- Prior art keywords
- screen
- projected
- reflected
- incident side
- polarization plate
- 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.)
- Granted
Links
Landscapes
- Liquid Crystal (AREA)
- Overhead Projectors And Projection Screens (AREA)
Abstract
PURPOSE:To attain the uniformity of the contrast of an entire screen by projecting and displaying an image in a state where reflected light corresponding to a heat spot, which occupies for the most part, is not projected on the screen. CONSTITUTION:A light beam lighted by a light source for lighting 11 and pass ing through a transmission type liquid crystal cell 1 is reflected by the reflecting film 8 of a Fresnel reflecting plate 9 and radiated from a polarization plate 5 on an incident side, then it is enlarged to be projected on the screen by a projecting optical system 14. At such a time, a projected spot image 16 which is reflected from the part of the heat spot 15 formed on a protecting cover 10 and the polarization plate 5 on the incident side is not reflected into the optical path of the projecting optical system 14 since the protecting cover 10 and the polarization plate 5 on the incident side are inclined. Then, the projected spot image 16 corresponding to the heat spot 15 does not appear on the screen. Thus, the contrast is uniformized all over the screen.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62207317A JP2565918B2 (en) | 1987-08-20 | 1987-08-20 | Reflective magnifying projector |
US07/091,668 US4818074A (en) | 1986-09-03 | 1987-09-01 | Projection device for irradiating a light to a display device and optically magnifying and projecting a reflection light therefrom |
GB8720627A GB2196165B (en) | 1986-09-03 | 1987-09-02 | A projection device |
DE19873729512 DE3729512C2 (en) | 1986-09-03 | 1987-09-03 | Projection device for the representation and enlargement of images |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62207317A JP2565918B2 (en) | 1987-08-20 | 1987-08-20 | Reflective magnifying projector |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6450037A true JPS6450037A (en) | 1989-02-27 |
JP2565918B2 JP2565918B2 (en) | 1996-12-18 |
Family
ID=16537767
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62207317A Expired - Lifetime JP2565918B2 (en) | 1986-09-03 | 1987-08-20 | Reflective magnifying projector |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2565918B2 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04155323A (en) * | 1990-10-18 | 1992-05-28 | Elmo Co Ltd | Reflection type overhead projector |
JPH0553090A (en) * | 1991-08-29 | 1993-03-05 | Fujitsu Ltd | Projection type display device |
JPH0659234A (en) * | 1992-08-06 | 1994-03-04 | Fujitsu Ltd | Projection type liquid crystal display |
US5975704A (en) * | 1997-01-10 | 1999-11-02 | In Focus Systems, Inc. | Multimedia projection system with image quality correction |
-
1987
- 1987-08-20 JP JP62207317A patent/JP2565918B2/en not_active Expired - Lifetime
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04155323A (en) * | 1990-10-18 | 1992-05-28 | Elmo Co Ltd | Reflection type overhead projector |
JPH0553090A (en) * | 1991-08-29 | 1993-03-05 | Fujitsu Ltd | Projection type display device |
JPH0659234A (en) * | 1992-08-06 | 1994-03-04 | Fujitsu Ltd | Projection type liquid crystal display |
US5975704A (en) * | 1997-01-10 | 1999-11-02 | In Focus Systems, Inc. | Multimedia projection system with image quality correction |
Also Published As
Publication number | Publication date |
---|---|
JP2565918B2 (en) | 1996-12-18 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EXPY | Cancellation because of completion of term |