JPS6480936A - Light source for projection type display device - Google Patents
Light source for projection type display deviceInfo
- Publication number
- JPS6480936A JPS6480936A JP62239654A JP23965487A JPS6480936A JP S6480936 A JPS6480936 A JP S6480936A JP 62239654 A JP62239654 A JP 62239654A JP 23965487 A JP23965487 A JP 23965487A JP S6480936 A JPS6480936 A JP S6480936A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- lamp
- ultraviolet rays
- spherical reflecting
- infrared
- 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 recover scattered light and save electric power by arranging a lens which has a reflecting film of a dichroic layer for infrared and/or ultraviolet rays at a projection opening while covering the almost entire three- dimensional having its center almost at a lamp with plural spherical reflecting mirrors. CONSTITUTION:The entire three-dimensional angle of the lamp 3 is covered with an inside spherical reflecting mirror 1 and an outside spherical reflecting mirror 2 which have their center at the lamp 3 and differ in radius, and they are so arranged that the lens 5 collimates a projection light beam from a window as part of the outside spherical reflecting mirror 2 into a parallel light beam. The dichroic coating layer 4 which reflects infrared and ultraviolet rays is formed on the surface of the lens 5. Namely, no light leaks except from the window where the lens 5 is fitted, so the lens projects only visible light and the infrared and ultraviolet rays are returned to the lamp. Consequently, the scattered light energy can be confined and used again to save the energy.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62239654A JPS6480936A (en) | 1987-09-24 | 1987-09-24 | Light source for projection type display device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62239654A JPS6480936A (en) | 1987-09-24 | 1987-09-24 | Light source for projection type display device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6480936A true JPS6480936A (en) | 1989-03-27 |
Family
ID=17047917
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62239654A Pending JPS6480936A (en) | 1987-09-24 | 1987-09-24 | Light source for projection type display device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6480936A (en) |
-
1987
- 1987-09-24 JP JP62239654A patent/JPS6480936A/en active Pending
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