发明名称 |
Unique copyboard having unique light attenuator |
摘要 |
A unique light attenuator is positioned between a bank of lamps and the underside of a light diffuser which supports a subject to be photographed in a process camera, such light attenuator comprising a first circular pattern of constant width, constant density lines and a second superimposed pattern of straight lines which compensate for nonuniformity of illumination of the subject.
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申请公布号 |
US4387985(A) |
申请公布日期 |
1983.06.14 |
申请号 |
US19810308329 |
申请日期 |
1981.10.05 |
申请人 |
ITEK CORPORATION |
发明人 |
MAGIN, IRVING J.;NELSON, ERIK K. |
分类号 |
G03B27/32;G02B5/20;G03B27/62;(IPC1-7):G03B27/72 |
主分类号 |
G03B27/32 |
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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