发明授权
- 专利标题： Focusing screen
- 专利标题（中）： 聚焦屏幕
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申请号： US161433申请日： 1980-06-20
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公开(公告)号： US4330188A公开(公告)日： 1982-05-18
- 发明人: Kazuo Fujibayashi , Kikuo Momiyama
- 申请人： Kazuo Fujibayashi , Kikuo Momiyama
- 申请人地址： JPX Tokyo
- 专利权人： Canon Kabushiki Kaisha
- 当前专利权人： Canon Kabushiki Kaisha
- 当前专利权人地址： JPX Tokyo
- 优先权： JPX54-78945 19790622
- 主分类号： G03B13/24
- IPC分类号： G03B13/24 ; G03B13/28
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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