Duel focal plane photocells

Details Duel focal plane photocells Duel focal plane photocells

1978-04-04

1979-11-27

Adams, Russell E.

354110, 354114, 354120, 354125, G03B 708

Patent

active

041758439

ABSTRACT:
A camera having a pair of spaced lenses for sequentially exposing successive adjacent portions of the same light sensitive surface of a film unit. A pair of opaque doors, each having a photocell thereon, are pivotally mounted in overlying relation to the adjacent portions of the film unit and directly in front of the focal plane of the lenses. The doors are mounted for simultaneous movement between a first position wherein one of the doors and its associated photocell is located beyond the light path between one of the lenses and one of the adjacent portions of the film unit while the other door and its associated photocell overlies the other portion of the film unit so as to prevent exposure thereof, and a second position wherein the one door overlies the one portion of the film unit so as to prevent exposure thereof and the other door is located beyond the light path between the other of the two lenses and the other portion of the film unit. The doors are coupled to a shutter release button such that depression of the button, when the doors are in the first position, results in initiating exposure of the one portion of the film unit to light passing through one of the lenses while the other photocell responds to the light passing through the other lens to control the exposure; and release of the shutter button results in the doors moving into the second position in preparation for the exposure of the other portion of the film unit to light passing through the other lens, which exposure will be controlled in accordance with the intensity of the light passing through the one lens and striking the one photocell.

REFERENCES:
patent: 1416502 (1922-05-01), Payne
patent: 1715593 (1929-06-01), Coan
patent: 1913998 (1933-06-01), Sullivan
patent: 1991924 (1935-02-01), Dolan
patent: 3690241 (1972-09-01), Nomura
"Can 11 SLR Meters All Be Right," Modern Photography, Nov. 1969, pp. 106-107.

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