Camera system and photometry circuit in an electronic flash devi

Details Camera system and photometry circuit in an electronic flash devi Camera system and photometry circuit in an electronic flash devi

1993-09-07

1995-04-18

Perkey, W. B.

354432, G03B 1505

Patent

active

054082935

ABSTRACT:
An electronic flash device is designed such that a photocurrent output from a light receiving circuit is converted into a frequency by a photocurrent-frequency converter circuit, the frequency output of the photocurrent-frequency converter circuit is counted by a counter, the output of the counter and the output of a comparator circuit are compared with each other by the comparator circuit and the result of the comparison is input to a light emission control circuit.

REFERENCES:
patent: 4297011 (1981-10-01), Adams, Jr.
patent: 4398127 (1983-08-01), Bahn
patent: 4603954 (1986-08-01), Egawa et al.

Affiliated with

Also associated with

Rating

Camera system and photometry circuit in an electronic flash devi does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Camera system and photometry circuit in an electronic flash devi, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Camera system and photometry circuit in an electronic flash devi will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-69787