Patent
1978-08-01
1980-04-29
Hix, L. T.
354 27, 354149, 354271, G03B 300, G03B 714, G03B 902
Patent
active
042003792
ABSTRACT:
An improved exposure control system configured for automatic operation in both the ambient light and flash illumination modes of operation and including a pair of displaceably mounted shutter-aperture blades, a blade position sensor operative to detect a blade position indicator on one of the blades, a follow focus system operable in the flash mode for moving at least an element of the sensor along a first sensor path of travel and a trim control device being operative in the flash mode for moving the sensor element along a second sensor path of travel that intersects and is tranversely disposed with respect to the first path. The sensor provides an output signal in response to sensing the blade indicator for temporarily interrupting blade displacement, incidental to flash firing, at a selected aperture value in accordance with the position of the sensor element determined by the combined follow focus and trim control inputs.
REFERENCES:
patent: 3433144 (1969-03-01), Ivister
patent: 3464332 (1969-09-01), Davison et al.
patent: 3832721 (1974-08-01), Erlichman
patent: 3928859 (1975-12-01), Peterson
patent: 3950766 (1976-04-01), Erlichman et al.
patent: 3977012 (1976-08-01), Erlichman
patent: 4007468 (1977-02-01), Blinow et al.
Hix L. T,.
Perkey William B.
Polaroid Corporation
Vale John S.
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