Photoflash detector

Details Photoflash detector Photoflash detector

1983-05-25

1985-01-22

Perkey, William B.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

3541271, 340600, 315134, G03B 1718, G03B 1756

Patent

active

044948522

ABSTRACT:
A self-contained photodetector for detecting the light flash from a photoflash unit which is supposed to flash when the shutter of a camera opens. The detector has a light-activated SCR for turning on an IC chip timer, which produces an output signal that turns on a transistor and causes a piezoelectric buzzer to produce an audible signal. All these components are powered by a battery which is contained in the same housing with them. This housing has an opening for passing light onto the SCR.

REFERENCES:
patent: 3707903 (1973-01-01), Weber
patent: 3714407 (1973-01-01), Bowers, Jr.
patent: 3778672 (1973-12-01), Fountain
patent: 3914647 (1975-10-01), Broekstra et al.
patent: 4100459 (1978-07-01), Nakamura et al.
patent: 4125766 (1978-11-01), Holtje
patent: 4155029 (1979-05-01), Yamaoka
patent: 4249160 (1981-02-01), Chilvers
patent: 4367933 (1983-01-01), Sahara

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