发明授权
US5109154A Focus detection device having a plurality of means for forming light
patterns provided at different distances from the optical axis
失效
焦点检测装置具有多个用于形成设置在与光轴不同的距离处的光图案的装置
- 专利标题: Focus detection device having a plurality of means for forming light patterns provided at different distances from the optical axis
- 专利标题(中): 焦点检测装置具有多个用于形成设置在与光轴不同的距离处的光图案的装置
-
申请号: US690332申请日: 1991-04-26
-
公开(公告)号: US5109154A公开(公告)日: 1992-04-28
- 发明人: Masaki Higashihara , Keiji Ohtaka , Kenji Suzuki , Takeshi Koyama , Yasuo Suda
- 申请人: Masaki Higashihara , Keiji Ohtaka , Kenji Suzuki , Takeshi Koyama , Yasuo Suda
- 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: JPX63-118814 19880516
- 主分类号: G03B13/36
- IPC分类号: G03B13/36 ; G02B7/34
摘要:
A focusing detecting device is disclosed having apparatus for forming object light patterns whose relative position changes in conformity with a focus state of an objective lens. Light flux passes through different areas of an exit pupil of the objective lens, and circuitry receives and photoelectrically converts the light patterns, and detects the focus state of the objective lens on the basis of the photoelectrically converted signal. The focusing apparatus accroding to the present invention a plurality of sets of structures for forming light patterns and means for photoelectrically converting the light patterns which are provided at different distances from the position of the optic axis of the objective lens. Also disclosed are means for making (a) the shapes of the areas of the exit pupil through which the light flux is passed to form the light patterns, or (b) intervals between the centers of gravity of said areas, or (c) both, different between a position in the vicinity of the optic axis of the objective lens, and a position distant therefrom.
公开/授权文献
- US5710310A Process for the continuous production of diaryl carbonates 公开/授权日:1998-01-20