Photometric circuit in a photographic flash device

Details Photometric circuit in a photographic flash device Photometric circuit in a photographic flash device

1983-08-24

1985-04-09

Adams, Russell E.

354484, G03B 1505

Patent

active

045098441

ABSTRACT:
An improved photographic flash device of the type in which a photometric circuit exposed to light reflected from a subject being photographed generates a photometric signal which controls the amount of light emitted by the flash discharge tube of the device. A synchronizing switch closed by opening the shutter of the camera with which the device is employed activates a starting circuit to generate a starting signal, which in turn starts a timer powered by the low tension circuit of a DC--DC converter utilized in the flash device. The timer applies a constant voltage to the photometric circuit for a predetermined period of time. Both the starting circuit and timer are capable of reduction to integrated circuit form.

REFERENCES:
patent: 4078240 (1978-03-01), Kaneko et al.
patent: 4164686 (1979-08-01), Vital et al.
patent: 4214825 (1980-07-01), Mizokami
patent: 4344680 (1982-08-01), Ishida et al.
patent: 4363542 (1982-12-01), Kando et al.
patent: 4427278 (1984-01-01), Ishida et al.
patent: 4441797 (1984-04-01), Maruyama et al.

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