Electronic exposure and flash control systems for slit-shutter t

Details Electronic exposure and flash control systems for slit-shutter t Electronic exposure and flash control systems for slit-shutter t

1981-02-05

1982-09-28

Adams, Russell E.

354 60F, 354145, 354149, G03B 1503

Patent

active

043515940

ABSTRACT:
A flash photography system adapted for the combination of an electronic flash device and a photographic camera with an electrically controlled shutter which, as in the case of two-curtain type focal plane shutters, effects film exposure with a slit scanning or sweeping over the film surface. To enable full film exposure of a scene being illuminated by the flash light, the electronic flash tube is controlled to emit light at a constant light intensity for a period sufficient enough to cover the time during which the shutter slit completes its travel. The flash light emission is initiated in synchronization with the actuation of the shutter, i.e., the commencement of the scanning or sweeping of the shutter slit. The flash light may be emitted prior to the shutter operation for the determination of camera diaphragm aperture.

REFERENCES:
patent: 3846811 (1974-11-01), Nakamura et al.
patent: 3868701 (1975-02-01), Kawasaki
patent: 4016575 (1977-04-01), Uchiyama et al.
patent: 4187019 (1980-02-01), Uchiyama et al.
patent: 4192595 (1980-03-01), Wakazono et al.
Electronic Flash Strobe by Edgerton, McGraw-Hill Book, pp. 24-41.

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