发明授权
- 专利标题: Focus detecting system
- 专利标题(中): 聚焦检测系统
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申请号: US941308申请日: 1986-12-15
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公开(公告)号: US4801963A公开(公告)日: 1989-01-31
- 发明人: Takeshi Koyama , Keiji Ohtaka
- 申请人: Takeshi Koyama , Keiji Ohtaka
- 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: JPX60-285001 19851218; JPX61-287078 19861202
- 主分类号: G02B7/32
- IPC分类号: G02B7/32 ; G03B3/00 ; G03B15/03
摘要:
A focus detecting system having a focus detecting apparatus for performing focus detection based on the output signal from a photo-sensing device, and a pattern projector for projecting a pattern onto an object, wherein the aforesaid pattern is so arranged that the spatial frequency lowers successively.
公开/授权文献
- US6115147A Image reading apparatus 公开/授权日:2000-09-05
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