JPS54148546A - Reflection type light source - Google Patents
Reflection type light sourceInfo
- Publication number
- JPS54148546A JPS54148546A JP5649678A JP5649678A JPS54148546A JP S54148546 A JPS54148546 A JP S54148546A JP 5649678 A JP5649678 A JP 5649678A JP 5649678 A JP5649678 A JP 5649678A JP S54148546 A JPS54148546 A JP S54148546A
- Authority
- JP
- Japan
- Prior art keywords
- light source
- rays
- concave mirror
- filament
- revolution
- 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
- Lenses (AREA)
Abstract
PURPOSE: To let the light radiating from the luminous body of a reflection type light source be radiated at large solid angles with high efficiency by combining a concave mirror having ellipsoid of revolution and a concave mirror having hyperboloid of revolution.
CONSTITUTION: The light source is constituted by a concave mirror 9 which has the shape of ellipsoid of revolution and has been applied with a reflecting film 7 on its inside surface, a concave mirror 11 which comprises having the shape of hyperboloid of revolution, having been applied with a reflecting film 9 on its inside surface and providing a window part 10 to a part of this reflecting film and the luminous body 13 provided in the position of the focus 12 common to these concave mirrors 8, 11. Out of the rays radiated from the filament 13 of these luminous bodies, the rays 16, 17 emitting to the back of the filament 13 reflect on the concave mirror 8, pass through the window 10 and are radiated in the direction of the second focus 18. The rays emitting to the front from the filament 13 pass directly through the window part 10 and are radiated to the outside. The rays emitting in other directions make 1 turn each and reflect on the concave mirrors 8, 11 and come back to the filament 13. These rays again contribute to the light radiation. In this way, the reflection type light source of high efficiency may be obtained.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5649678A JPS54148546A (en) | 1978-05-15 | 1978-05-15 | Reflection type light source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5649678A JPS54148546A (en) | 1978-05-15 | 1978-05-15 | Reflection type light source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS54148546A true JPS54148546A (en) | 1979-11-20 |
Family
ID=13028699
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5649678A Pending JPS54148546A (en) | 1978-05-15 | 1978-05-15 | Reflection type light source |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS54148546A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57130346U (en) * | 1981-02-03 | 1982-08-13 | ||
| JPH0229108U (en) * | 1988-08-18 | 1990-02-26 | ||
| JPH0352907U (en) * | 1989-09-29 | 1991-05-22 | ||
| JPH0414032A (en) * | 1990-05-08 | 1992-01-20 | Canon Inc | Illuminating device and image display device provided therewith |
| JPH0453926A (en) * | 1990-06-21 | 1992-02-21 | Nippon Sheet Glass Co Ltd | Illuminator |
| US5217299A (en) * | 1990-09-04 | 1993-06-08 | Asahi Kogaku Kogyo Kabushiki Kaisha | Reflection type lighting apparatus |
| JP2002189192A (en) * | 2000-10-10 | 2002-07-05 | Ricoh Co Ltd | Illuminator and liquid crystal projector |
-
1978
- 1978-05-15 JP JP5649678A patent/JPS54148546A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57130346U (en) * | 1981-02-03 | 1982-08-13 | ||
| JPH0229108U (en) * | 1988-08-18 | 1990-02-26 | ||
| JPH0352907U (en) * | 1989-09-29 | 1991-05-22 | ||
| JPH0414032A (en) * | 1990-05-08 | 1992-01-20 | Canon Inc | Illuminating device and image display device provided therewith |
| JPH0453926A (en) * | 1990-06-21 | 1992-02-21 | Nippon Sheet Glass Co Ltd | Illuminator |
| US5217299A (en) * | 1990-09-04 | 1993-06-08 | Asahi Kogaku Kogyo Kabushiki Kaisha | Reflection type lighting apparatus |
| JP2002189192A (en) * | 2000-10-10 | 2002-07-05 | Ricoh Co Ltd | Illuminator and liquid crystal projector |
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