1984-09-20
1985-12-17
Adams, Russell E.
G03B 700
Patent
active
045589348
ABSTRACT:
A film speed correction circuit for electrically controlled cameras having aperture or shutter speed controlled responsively to ambient light sensings from a photosensor features a controllable multi-stage amplifier preferably interposed between the photosensor and the aperture or shutter control means. The amplifier features a plurality of cascaded stages, each stage being operated to two different gain values according to a sensing signal provided thereto, the sensing signals for each stage being derived from coded insulating and conducting areas on the outer surface of the film cassette. Use of active stages interposed between passive attenuating stages substantially eliminates interstage loading and allows the use of standard resistance values to provided proper gain values for each stage.
REFERENCES:
patent: 4200371 (1980-04-01), Suzuki et al.
patent: 4431283 (1984-02-01), Hoda et al.
Adams Russell E.
Arnold Stephen R.
Hattis Russell E.
W. Haking Enterprises Limited
LandOfFree
Camera exposure control system 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 exposure control system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Camera exposure control system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2171806