发明授权
- 专利标题: Distance measuring equipment and camera
- 专利标题(中): 距离测量设备和相机
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申请号: US09627297申请日: 2000-07-27
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公开(公告)号: US06345153B1公开(公告)日: 2002-02-05
- 发明人: Takaaki Kotani , Shuichi Ishii , Seimei Ushiro
- 申请人: Takaaki Kotani , Shuichi Ishii , Seimei Ushiro
- 优先权: JP11-216480 19990730; JP12-203235 20000705
- 主分类号: G03B1300
- IPC分类号: G03B1300
摘要:
There are disclosed a distance measuring equipment capable of performing a distance measurement with greater accuracy suppressing cost up, and a camera. In case of the short distance area and the middle distance area, switches 61 and 62 are set up to the turn-off state, and switch 63 is set up to take the contact 63a side, so that photo-current signals I1 and I2 from PSD 30 are fed to input terminals 41 and 42 to perform a usual ratio arithmetic processing. In case of the long distance area, the switches 61 and 62 are set up to the turn-off state and the turn-on state, respectively, and the switch 63 is set up to take the contact 63b side, so that photo-current signal the I1 and fixed current signal Ir are fed to the input terminals 41 and 42 to perform a ratio arithmetic processing based on the fixed current signal. In case of the longest distance area, the switches 61 and 62 are set up to the turn-on state and the turn-off state, respectively, and the switch 63 is set up to take the contact 63b side to form a first signal transmission path, so that an addition value of the photo-current signals I1 and I2 and the fixed current signal Ir are fed to the input terminals 41 and 42 to perform a ratio arithmetic processing based on light quantity to determine focusing data.