发明名称 |
Reflector for varying illumination distribution |
摘要 |
The angular distribution of illumination passing through a selectively diffusing element can be varied by placing the diffusing element in a reflector unit so that the diffusing element is in the path between a light source and the object to be illuminated. A variable diffuser can comprise a liquid-crystal cell driven by a variable voltage to control the amount of diffusion by the reflector unit. The control voltage can be set in accordance with change in focal length in a zoom lens of a camera using the light source and reflector unit as a flash gun.
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申请公布号 |
US4323952(A) |
申请公布日期 |
1982.04.06 |
申请号 |
US19800154968 |
申请日期 |
1980.05.30 |
申请人 |
ROLLEI-WERKE FRANKE & HEIDECKE GMBH & CO. |
发明人 |
PROSKE, JOACHIM |
分类号 |
G03B7/16;F21V7/00;F21V9/10;G02F1/1335;G03B15/02;G03B15/03;G03B15/05;(IPC1-7):G03B15/02 |
主分类号 |
G03B7/16 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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