发明名称 |
Aperture member for photo plotting apparatus |
摘要 |
Photo plotter aperture members each have a beam forming trasnsparent ring and a central transparent cross in communication with the ring. The rings of the different members are of different diameters but of the same thickness as the lines of the respective crosses to provide uniform exposure during half diameter strokes of the aperture members.
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申请公布号 |
US4761057(A) |
申请公布日期 |
1988.08.02 |
申请号 |
US19870016602 |
申请日期 |
1987.02.19 |
申请人 |
GENERAL ELECTRIC COMPANY |
发明人 |
ZAK, GREGORY M.;CUOMO, EDWARD |
分类号 |
G03B15/00;(IPC1-7):G02B26/02;G01J3/04 |
主分类号 |
G03B15/00 |
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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