发明名称 |
Photometric apparatus for cameras |
摘要 |
A photometric apparatus for a camera comprises a reference voltage circuit; an operational amplifier including a photoelectromotive element for photometry, an output terminal of said reference voltage circuit and an input terminal of said amplifier being connected through an impedeance element to a voltage divider tap of a battery; and a switching circuit for switching said reference voltage circuit to an operable condition as well as for changing set resistors which apply a bias current to said operational amplifier, in synchronism with a shutter releasing operation.
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申请公布号 |
US4498753(A) |
申请公布日期 |
1985.02.12 |
申请号 |
US19830532686 |
申请日期 |
1983.09.16 |
申请人 |
OLYMPUS OPTICAL CO., LTD. |
发明人 |
MIZOKAMI, KAZUNORI |
分类号 |
G03B7/081;G01J1/44;G03B7/08;(IPC1-7):G03B7/081 |
主分类号 |
G03B7/081 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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