Single lens reflex camera equipped with mirror elevation detecto

Details Single lens reflex camera equipped with mirror elevation detecto Single lens reflex camera equipped with mirror elevation detecto

1981-05-08

1984-07-10

Perkey, William B.

354155, G03B 1718, G03B 1912

Patent

active

044589972

ABSTRACT:
A single lens reflex camera is provided with a photocell so positioned in the camera as to receive thereon light incident through the lens and reflected onto the photocell by the mirror. During each photographing operation, the mirror is pivotally elevated so that the incident light is no longer received by the photocell. The camera electronics monitors the photocell output which is representative of the magnitude of light received by the photocell and, unless a relatively rapid change in photocell output is detected during a photographing operation, an alarm is actuated to indicate failure of the mirror to properly pivot.

REFERENCES:
patent: 4106033 (1978-08-01), Nakamoto et al.
patent: 4176936 (1979-12-01), Kozuki et al.
patent: 4265521 (1981-05-01), Uchidoi et al.
patent: 4313658 (1982-02-01), Sugiura et al.

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