Light measuring circuit

Details Light measuring circuit Light measuring circuit

1975-08-21

1976-07-20

Peters, Joseph F.

Optics: measuring and testing

Range or remote distance finding

With photodetection

354 51, 354 60R, 356226, G03B 708, G01J 144

Patent

active

039710459

ABSTRACT:
Light responsive circuit of low current consumption and low cost and used for camera exposure control and/or exposure indication. The circuit includes a field effect transistor, a photodiode connected between gate and source of the field effect transistor, a transistor having a collector connected to the gate of the field effect transistor and further having a base connected to the source of the field effect transistor, and a control circuit for controlling base voltage of the transistor to regulate source potential of the field effect transistor.

REFERENCES:
patent: 3849786 (1974-11-01), Nanba et al.
patent: 3879740 (1975-04-01), Mari et al.
patent: 3883882 (1975-05-01), Mari

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