发明授权
- 专利标题： Device for detecting focus at different areas of an image field
- 专利标题（中）： 用于在图像场的不同区域检测焦点的装置
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申请号： US266315申请日： 1994-06-27
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公开(公告)号： US5393969A公开(公告)日： 1995-02-28
- 发明人: Keiji Ohsawa
- 申请人： Keiji Ohsawa
- 申请人地址： JPX Tokyo
- 专利权人： Nikon Corporation
- 当前专利权人： Nikon Corporation
- 当前专利权人地址： JPX Tokyo
- 优先权： JPX4-031600 19920122; JPX4-328656 19921113
- 主分类号： G02B7/34
- IPC分类号： G02B7/34 ; G03B13/36 ; G01J1/20
摘要：
A focus state detecting device of divided-pupil phase difference system, having plural distance measuring areas, in which photosensors are provided respectively corresponding to the distance measuring areas in the image field in order to effect focus state detection in the plural distance measuring areas, and at least a part of the photosensors are constructed as an independent unit separate from others, whereby optical adjustment is rendered possible independently in each distance measuring area.
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