Overexposure indicator for an automatic electronic flash

Details Overexposure indicator for an automatic electronic flash Overexposure indicator for an automatic electronic flash

1982-08-09

1984-01-17

Perkey, William B.

354471, 3541271, G03B 1505

Patent

active

044261438

ABSTRACT:
An overexposure indicator for an automatic electronic flash produces a time factor signal of a given duration after an emission terminate signal is delivered to an electronic flash. When the amount of flashlight emitted by the electronic flash reaches an arbitrary multiple of a proper value of exposure, a detection output is produced. The indicator indicates the occurrence of an overexposure whenever detection output is produced during the time the time factor signal is present.

REFERENCES:
patent: 4122465 (1978-10-01), Hasegawa et al.
patent: 4193677 (1980-03-01), Hasegawa et al.

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