Exposure control system with shutter operation controlled by a m

Details Exposure control system with shutter operation controlled by a m Exposure control system with shutter operation controlled by a m

1980-12-16

1982-04-20

Gellner, Michael L.

354 29, G03B 7097

Patent

active

043256147

ABSTRACT:
An automatic exposure control system, of the type wherein a dynamic aperture blade mechanism is displaceably driven by a stepper motor, is provided with a microcomputer that is preprogrammed with data representing a plurality of different blade trajectory signal programs for different photographic conditions. In response to inputs, including scene brightness level, provided before or during an exposure cycle, the computer develops an appropriate trajectory signal program and feeds the signals to the stepper motor so as to drive the blade mechanism in a manner characterized by a corresponding trajectory curve that is correlated to the indicated photographic conditions. In one embodiment the system is configured for open loop operation, and, in an alternative embodiment, the system additionally includes a blade position feedback circuit for closed loop operation.

REFERENCES:
patent: 3628119 (1973-12-01), Abraham
patent: 3636429 (1972-01-01), Jakubowski et al.
patent: 3733991 (1973-05-01), Kobagashi et al.
patent: 3820131 (1974-06-01), Tanaka
patent: 3900855 (1975-08-01), Stempeck
patent: 3945025 (1976-03-01), Stempeck
patent: 4053907 (1977-10-01), Ineata et al.
patent: 4066347 (1978-01-01), Wagensonner
patent: 4196987 (1980-04-01), Erlichman
"Microprocessor Exposure Control in a Camera", by D. M. Harvey, Research Disclosures, Feb. 1980, #19041.
"Photographic Shutters: Better Pictures . . . ", by W. T. Plummer, Applied Optics, vol. 16, p. 1914, Jul. 1977.

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