发明名称 |
Focusing screen |
摘要 |
A focusing screen capable of showing an out-of-focus image in a conspicuous manner has a split prism forming portion on the central portion thereof which consists of a central area and a peripheral area surrounding the central area. Split prisms slanting in different directions are formed in the central and peripheral areas of the split prism forming portion.
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申请公布号 |
US4330188(A) |
申请公布日期 |
1982.05.18 |
申请号 |
US19800161433 |
申请日期 |
1980.06.20 |
申请人 |
CANON KABUSHIKI KAISHA |
发明人 |
FUJIBAYASHI, KAZUO;MOMIYAMA, KIKUO |
分类号 |
G03B13/24;G03B13/28;(IPC1-7):G03B13/28 |
主分类号 |
G03B13/24 |
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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