Exposure control system for flash photography

Details Exposure control system for flash photography Exposure control system for flash photography

1974-08-19

1978-01-10

Braun, Fred L.

354 33, 354145, G03B 1503, G03B 716

Patent

active

040682455

ABSTRACT:
A flash exposure control system comprising a flash lighting unit, a battery circuit connected to said flash lighting unit to energize said flash lighting unit during an exposure, a switching arrangement connected to said flash lighting unit to control the termination of energization of said flash lighting unit, a timer for controlling the conduction of said switching arrangement, the timer having an adjustable circuit for adjusting the duration of conducting time as a function of the camera-to-object distance and the adjustable circuit being responsive to the camera focus adjustment, and an aperture adjusting unit responsive to the focus adjustment for defining an exposure aperture.

REFERENCES:
patent: 2596376 (1952-05-01), De Goeij
patent: 2682603 (1954-06-01), Dine et al.
patent: 3326107 (1967-06-01), Rentschler
patent: 3374342 (1968-03-01), Hutchins
patent: 3611895 (1971-10-01), VON Albedyll et al.
patent: 3646865 (1972-03-01), Biber
patent: 3687028 (1972-08-01), Rentschler
patent: 3705540 (1972-12-01), Reed et al.
patent: 3710701 (1973-01-01), Takishima et al.
patent: 3738240 (1973-06-01), Mitani et al.

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