发明授权
- 专利标题： Photometry device and camera with photometry device
- 专利标题（中）： 光度测量装置和带测光装置的相机
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申请号： US561967申请日： 1995-11-22
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公开(公告)号： US5717965A公开(公告)日： 1998-02-10
- 发明人: Hiroyuki Iwasaki
- 申请人： Hiroyuki Iwasaki
- 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： JPX6-287788 19941122; JPX6-287811 19941122
- 主分类号： G03B7/091
- IPC分类号： G03B7/091 ; G03B3/00 ; G03B7/08
摘要：
A device has a photometry unit for performing a photometry operation of an object field using an accumulation type photometry element, and an accumulation time determination unit for determining the accumulation time of the photometry element. The accumulation time determination unit determines the value of the accumulation time for the next photometry operation by calculating a weighted average of the accumulation times in previous photometry operations. Since the value of the accumulation time for the next photometry operation is determined by calculating a weighted average of the accumulation times in previous photometry operations, the influence of flickering of an illumination light source can be eliminated, and a photometered value can be output within a short period of time.
公开/授权文献
- US5092481A Method and apparatus for steadily holding a container 公开/授权日：1992-03-03
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