Proper synchronization of the firing of electronic flash units

Details Proper synchronization of the firing of electronic flash units Proper synchronization of the firing of electronic flash units

1976-03-15

1978-01-03

Hix, L. T.

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

Plural load device systems

354145, 315241P, G03B 1503

Patent

active

040670287

ABSTRACT:
A photographic camera is provided with means for detachably mounting either a flashbulb flash unit or an electronic flash unit. The camera includes a piezoelectric transducer mechanically activatable for generating voltage impulses. When the flashbulb flash unit is mounted on the camera, the voltage impulses are directly applied across the terminals of the flashbulb. There elapses a certain time interval between the start of flashbulb firing and the development of maximum flashbulb output illumination. This time interval is taken into account in the design of the shutter-activating mechanism. When, instead of the flashbulb flash unit, the electronic flash unit is mounted on the camera, the voltage impulses generated for flashbulb firing are utilized to initiate operation of the electronic flash unit. Because the flash tube of the unit develops maximum output illumination more quickly than does a flashbulb, a time-delay circuit is utilized to effect compensation.

REFERENCES:
patent: 3417297 (1966-10-01), Wallentowitz
patent: 3712197 (1973-01-01), Wagner
patent: 3896459 (1975-07-01), Ogawa et al.
patent: 3969737 (1976-07-01), Kendrick

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