Photographic flash unit

Details Photographic flash unit Photographic flash unit

1968-12-30

1978-07-18

Dahl, Lawrence J.

Electric lamp and discharge devices: systems

Condenser in the supply circuit

Condenser in shunt to the load device and the supply

315151, 315159, 354 33, H05B 3700

Patent

active

041018125

ABSTRACT:
An automatic flash-limiting arrangement for use in combination with a flash unit associated with a camera and arranged to automatically terminate the light flash produced by the unit when the subject has been properly exposed, the flash-limiting arrangement being associated with the flash unit so as to become operative only upon initiation of a light flash, thus assuring that the arrangement will not respond to extraneous flashes occurring before the flash which is to be controlled. The flash-limiting arrangement is constructed to sense the light being received by the camera, to produce a signal which is the sum of a component proportional to the time integral of the intensity of such light and a component which is proportional to the instantaneous amplitude of the intensity of such light, and to terminate the flash when this signal reaches a predetermined value.

REFERENCES:
patent: 2358796 (1944-09-01), Edgerton
patent: 3033988 (1962-05-01), Edgerton
patent: 3316445 (1967-04-01), Ahrons
patent: 3340426 (1967-09-01), Elliott
patent: 3481258 (1969-12-01), Moni et al.
patent: 3489499 (1970-01-01), Biber
patent: 3519879 (1970-07-01), Ogawa

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