Photography – Single lens reflex camera – With mirror support or drive
Patent
1997-01-27
1998-11-24
Perkey, W. B.
Photography
Single lens reflex camera
With mirror support or drive
G03B 1912
Patent
active
058420657
ABSTRACT:
A mirror operating device for speeding up a photographic operation cycle in a camera having a reflecting mirror for viewfinder observation. The reflecting mirror is movable between a first position blocking a photographic optical path and a second position aside from the photographic optical path. An electromotive drive source moves the reflecting mirror to the first position from the second position after an exposure to view a subject in a viewfinder. The time required for performing a mirror lowering operation is improved by controlling operation of a shutter mechanism and the electromotive drive source to move the reflecting mirror according to specific timing operations. The opening of the shutter mechanism is controlled according to a signal from a first delay device, and the start of the electromotive drive source to drive the mirror is started in response to a signal from a second delay device. The signals from the first delay device and the second delay device are output with respect to a reference signal such that the electromotive drive source starts moving the mirror before the shutter mechanism is finished closing, at a time that the reflecting mirror substantially does not obstruct the photographic optical path until the closing of the shutter mechanism finishes.
REFERENCES:
patent: 4339189 (1982-07-01), Nakano
Nikon Corporation
Perkey W. B.
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