Control of shutter closing for excessive object brightness

Details Control of shutter closing for excessive object brightness Control of shutter closing for excessive object brightness

1980-01-25

1981-11-17

Hix, L. T.

354 38, 354 51, 354137, 354267, G03B 7083

Patent

active

043008259

ABSTRACT:
In a camera shutter control system, film exposure is ensured even when object brightness is so high as to require a shutter speed faster than the maximum shutter speed available and at which shutter operation might not cause film exposure without the present invention. A delay circuit provides a delay in addition to the time provided by the shutter control circuit as a function of object brightness, and a delay control circuit actuates the delay circuit only when the object brightness exceeds a given level. An optional flash control circuit interrupts flash firing in response to the shutter closing signal of the shutter control system. In that case, the delay control circuit is disabled in response to the high brightness of the object illuminated by the flash light, by means of a low pass filter which does not allow the rapidly changing signal produced by the flash to be transmitted to the delay control circuit.

REFERENCES:
patent: 3683767 (1972-08-01), Sahara

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