Camera with diaphragm adjustment control

Details Camera with diaphragm adjustment control Camera with diaphragm adjustment control

1982-12-10

1984-08-07

Adams, Russell E.

G03B 708

Patent

active

044640404

ABSTRACT:
A photographic camera has a camera body and an interchangeable lens assembly engagable with the camera body. A diaphragm having an adjustable diaphragm value in the lens assembly is adjusted upon shutter release. The diaphragm value is sensed in the lens assembly during adjustment and a first signal representative of the sensed diaphragm value is transmitted to the camera body. In the camera body the sensed diaphragm value is compared with a desired diaphragm value responsive to the first signal. Responsive to the comparison, adjustment of the diaphragm value is arrested to establish the desired diaphragm value. To sense the diaphragm value, a light transmission path is established between a light source and a light receiver. The light transmission path includes a first optical grating mounted on a movable diaphragm actuating member and a second optical grating mounted on a stationary member. The gratings each have alternating sections of the same width with different optical characteristics so adapted to intermittently transmit a light pulse to the receiver for each increment of movement of the movable member equal to the width of the sections. The light pulses are counted to produce an indication of the diaphragm value.

REFERENCES:
patent: 4009866 (1977-03-01), Iwata et al.
patent: 4079386 (1978-03-01), Murakami et al.
patent: 4079387 (1978-03-01), Kawamura et al.
patent: 4396272 (1983-08-01), Shono et al.

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