Photometric apparatus for cameras

Details Photometric apparatus for cameras Photometric apparatus for cameras

1983-09-16

1985-02-12

Perkey, William B.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

250214P, 250214L, 356223, G03B 7081, G01J 144

Patent

active

044987536

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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