Photometric apparatus for cameras
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United States of America Patent
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Feb 12, 1985
Grant Date -
N/A
app pub date -
Sep 16, 1983
filing date -
Jan 12, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
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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