发明名称 |
Radially varying transmission filter for wide angle copying device |
摘要 |
A neutral density filter with a radially varying transmission is inserted in close proximity to the projection lens in a photocopier optical system. The filter has a transmission profile which provides compensation for photoconductor irradiance falloff due to cos4 as well as other circularly symmetrical non-uniformities in the optical system such as lens exit pupil distortion.
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申请公布号 |
US4298275(A) |
申请公布日期 |
1981.11.03 |
申请号 |
US19800110062 |
申请日期 |
1980.01.07 |
申请人 |
XEROX CORPORATION |
发明人 |
CRITCHLOW, JAMES A.;OZERN, DONNA U. |
分类号 |
G03B27/34;G03B27/54;G03G15/041;(IPC1-7):G03B27/72 |
主分类号 |
G03B27/34 |
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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