JPS5616119A - Reflective screen - Google Patents
Reflective screenInfo
- Publication number
- JPS5616119A JPS5616119A JP9246379A JP9246379A JPS5616119A JP S5616119 A JPS5616119 A JP S5616119A JP 9246379 A JP9246379 A JP 9246379A JP 9246379 A JP9246379 A JP 9246379A JP S5616119 A JPS5616119 A JP S5616119A
- Authority
- JP
- Japan
- Prior art keywords
- diffusion angle
- screen
- angles
- reflection
- faces
- 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
- Overhead Projectors And Projection Screens (AREA)
Abstract
PURPOSE: To make brightness fixed within the diffusion angle without loss of light energy, by forming the reflection face of the screen by arranging regularly many units having minute spherical faces which are curved concavely or convexly in the horizontal direction and the vertical direction.
CONSTITUTION: In the partial expanded figure of a reflective screen, many units 9 having minute spherical faces 8 where reflection faces 7 are curved convexly (or concavely) in the horizontal direction and the vertical direction are arranged regularly. Then, diffusion angle ±θH in the horizontal direction of the reflective screen and diffusion angle ±θV in the vertical direction are equal to angles θa and θb made by normal curves 11a and 11b of both ends of arc 11 in the horizontal section direction and the vertical section direction on the center line of respective spherical faces 8 of single substances 9 respectively. Consequently, diffusion angles ±θH and ±θV can be set to prescribed values arbitrarily by changing angles θa and θb made by normal curves 11a and 11b in relation to reflection directivity of the screen, and further, brightness within a set diffusion angle is fixed, and loss of light energy exists little.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9246379A JPS5616119A (en) | 1979-07-18 | 1979-07-18 | Reflective screen |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9246379A JPS5616119A (en) | 1979-07-18 | 1979-07-18 | Reflective screen |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5616119A true JPS5616119A (en) | 1981-02-16 |
Family
ID=14055039
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9246379A Pending JPS5616119A (en) | 1979-07-18 | 1979-07-18 | Reflective screen |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5616119A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1271190A1 (en) * | 2001-06-28 | 2003-01-02 | Alps Electric Co., Ltd. | Reflector and reflective liquid crystal display |
-
1979
- 1979-07-18 JP JP9246379A patent/JPS5616119A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1271190A1 (en) * | 2001-06-28 | 2003-01-02 | Alps Electric Co., Ltd. | Reflector and reflective liquid crystal display |
US6695454B2 (en) | 2001-06-28 | 2004-02-24 | Alps Electric Co., Ltd. | Reflector which exhibits good reflectance over wide angle range and liquid crystal display using the same |
US6829094B2 (en) | 2001-06-28 | 2004-12-07 | Alps Electric Co., Ltd. | Reflector which exhibits good reflectance over wide angle range and liquid crystal display using the same |
US6863410B2 (en) | 2001-06-28 | 2005-03-08 | Alps Electric Co., Ltd. | Reflector which exhibits good reflectance over wide angle range and liquid crystal display using the same |
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