Light emission control system for a flash device

Details Light emission control system for a flash device Light emission control system for a flash device

2005-07-26

2005-07-26

Perkey, W. B. (Department: 2851)

Photography

With object illumination for exposure

Having preexposure illumination

C348S371000

Reexamination Certificate

active

06922528

ABSTRACT:
A light emission control system for a flash device includes a plurality of photometering sensors for photometric measurements on different photometering zones; and a controller which outputs a periodic pulsed trigger signal for activating the flash device, and sequentially selects analog signals output from the plurality of photometering sensors to convert the analog signals into digital signals in sequence. The controller outputs the pulsed trigger signal having a predetermined pulse frequency to perform a pre-flash emission operation in which the flash device is activated to discharge intermittently. The controller subsequently converts each analog signal into a corresponding digital signal in sequence in accordance with each trigger pulse of the periodic pulsed trigger signal before performing a main flash emission operation in which the flash device is activated to discharge at a time of exposure.

REFERENCES:
patent: 5499075 (1996-03-01), Sato et al.
patent: 6094536 (2000-07-01), Harada
patent: 6560412 (2003-05-01), Iwasaki
patent: 8-248468 (1996-09-01), None
patent: 2002-169194 (2002-06-01), None
English Language Abstract of JP 2002-169194.
English Language Abstract of JP 8-248468.

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