Control signal generator for camera

Details Control signal generator for camera Control signal generator for camera

1986-11-18

1988-06-14

Adams, Russell E.

354437, 354439, G03B 708

Patent

active

047515430

ABSTRACT:
A control signal generator for a camera arranged to control the aperture of a stop by the opening degree of at least two shutter blades; to detect the opening degree of the shutter by detecting, with a photo interrupter, openings provided in one of the shutter blades; and to form a control signal based on to the opening degree of the shutter thus detected. When the shutter is closed, a shutter blade other than the blade having the openings confronts the light emitting and receiving elements of the photo interrupter to block an optical path thereby. When the shutter begins to open, the optical path is opened and the photo interrupter generates a signal indicating commencement of the opening action of the shutter.

REFERENCES:
patent: 4009866 (1977-03-01), Iwata et al.
patent: 4053907 (1977-10-01), Iwata et al.
patent: 4354748 (1982-10-01), Grimes et al.
patent: 4445762 (1984-05-01), Boccuti
patent: 4477161 (1984-10-01), Kawasaki et al.

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