Camera exposure time control circuitry

Details Camera exposure time control circuitry Camera exposure time control circuitry

1977-09-29

1979-04-17

Hix, L. T.

G03B 708

Patent

active

041497864

ABSTRACT:
Control circuitry controls exposure time in accordance with a light representative signal that has been stored in a storing device through a storing switch from a light measuring circuit which includes a photocell receiving scene light through the camera objective. The storing switch includes an emitter follower transistor circuit through which the light representative signal is transmitted from the light measuring circuit to the storing device, and which is turned off in response to actuation of a switch adapted for energization of the shutter control magnet. Constant current sources ensure temperature stabilization of the emitter-follower circuit such that the voltage stored by the storing device accurately represents the output of the light measuring circuit.

REFERENCES:
patent: 3977011 (1976-08-01), Matsuda
patent: 4069489 (1978-01-01), Matsuda

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