Camera exposure control system adapted to adjust both the diaphr

Details Camera exposure control system adapted to adjust both the diaphr Camera exposure control system adapted to adjust both the diaphr

1975-07-14

1978-02-14

Adams, Russell E.

354 29, 354 43, 354 44, 354 50, 354 51, 354 60A, G03D 708

Patent

active

040742890

ABSTRACT:
This invention provides for automatically adjusting the diaphragm opening in a camera having a shutter operated in an automatic manner for controlling exposure time, so as to counteract such problems as the exposure time being adjusted to the point within its adjustability range at which slight hand movements result in a blurred photograph. A camera embodying the invention includes diaphragm driving circuitry responsive to a drive control signal, such as a sequence of drive pulses, supplied thereto, and a digital circuit arrangement for selectively applying the drive control signal to cause the diaphragm opening to be adjusted from a manual presetting thereof to a setting that, under prevailing lighting conditions, is consistent with an acceptable range of exposure times.

REFERENCES:
patent: 3879118 (1975-04-01), Kiyohara et al.
patent: 3900855 (1975-08-01), Stempeck
patent: 3903528 (1975-09-01), Kee
patent: 3928858 (1975-12-01), Sakurada et al.
patent: 3969735 (1976-07-01), Nobusawa
Data Sheet, Parallel Processing System, Microelectronic Device Division, Rockwell International.

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