Automatic flash control device of camera

Details Automatic flash control device of camera Automatic flash control device of camera

1993-07-16

1995-03-28

Adams, Russell E.

354480, G03B 1505

Patent

active

054022010

ABSTRACT:
An automatic flash control device of a camera includes a flashing source for performing preliminary flashing and main flashing, a first photodetector for measuring a light beam reflected by an object field and reflected by a shutter curtain via a taking lens upon preliminary flashing from the flashing source before exposure, and a second photodetector for measuring a light beam reflected by the object field and reflected by a film surface via the taking lens upon main flashing from the flashing source during exposure. In this device, the displacement between photometry areas caused by the different positions of the shutter curtain and the film surface is corrected, and the identity between object field areas to be measured in the preliminary flashing mode and the main flashing mode can be assured.

REFERENCES:
patent: 5006879 (1991-04-01), Takagi et al.
patent: 5164759 (1992-11-01), Yasukawa
patent: 5168300 (1992-12-01), Yasukawa
patent: 5172157 (1992-12-01), Takagi
patent: 5218397 (1993-06-01), Takagi
patent: 5221941 (1993-06-01), Matsui et al.
patent: 5227836 (1993-07-01), Yasukawa
patent: 5231447 (1993-07-01), Takagi
patent: 5231448 (1993-07-01), Sato et al.

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