发明名称 |
Light measuring device |
摘要 |
The disclosed light measuring arrangement is positioned to receive and measure light from a focusing screen on which a display of focusing conditions is superimposed. A correcting circuit corrects the object brightness sensed by the light measuring arrangement. When display segments of the display are selectively switched on and off, the correcting circuit produces an output signal representing a corresponding brightness correction factor which is applied to the light measuring arrangement.
|
申请公布号 |
US4681420(A) |
申请公布日期 |
1987.07.21 |
申请号 |
US19860839802 |
申请日期 |
1986.03.12 |
申请人 |
CANON KABUSHIKI KAISHA |
发明人 |
SUDA, YASUO;ALYFUKU, KIYOSHI;SUNOUCHI, AKIO;SUZUKI, NOBUYUKI |
分类号 |
G03B13/36;G02B7/28;G03B3/00;G03B7/091;G03B7/099;G03B17/20;(IPC1-7):G03B3/00 |
主分类号 |
G03B13/36 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|