Interface circuit of an electronic flash unit

Details Interface circuit of an electronic flash unit Interface circuit of an electronic flash unit

1995-12-14

1998-03-03

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Gating

Utilizing three or more electrode solid-state device

327444, H03K 1772

Patent

active

057239975

ABSTRACT:
A synchronized flash emission of a strobe for high speed successive photo shooting. A transistor and a first resistor are connected in parallel to a resistor second of a strobe interface circuit. A control circuit switches the transistor ON for a duty cycle of 1/10 to increase the current flowing through a Triac to be greater than a holding current. The increased current raises the voltage of a synchronized signal to HIGH when the Triac is switched OFF. The strobe detects a HIGH to LOW transition of the synchronized signal even for successive photo shootings at high speed so that synchronized successive flashes can be provided.

REFERENCES:
patent: 3610961 (1971-10-01), Hewlett
patent: 3873854 (1975-03-01), Lamb
patent: 4031458 (1977-06-01), Ichikawa
patent: 4325099 (1982-04-01), Morehouse et al.
patent: 5111372 (1992-05-01), Kameyama et al.
patent: 5498995 (1996-03-01), Szepesi et al.
Malcolm "Fundamentals of Electronics", Breton Publishers, Boston 1987 pp. 276-277.

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