1990-12-18
1992-08-04
Hix, L. T.
G03B 1704
Patent
active
051363151
ABSTRACT:
A barrier apparatus of a camera includes a barrier unit which has barrier blades which are biased in a direction to close a photographing aperture, and an operational portion which opens the barrier blades against the biasing force. A lens barrel is provided to which the barrier blades are mounted and which is moved in an optical axis direction between a photographing position and a retracted position. A barrier driving member, which is moved to a disengagement position, in which it is disengaged from the operational portion of the barrier unit when the lens barrel is in the retracted position. The driving member moves the operational portion in a direction to open the barrier blades in the photographing position. The barrier driving member is continuously biased in a direction so as to open the barrier blades, with a driving member engaging mechanism which holds the barrier driving member in the disengagement position against the biasing force applied thereto being adapted to disengage the barrier driving member from the operational portion before the barrier unit is mounted to the lens barrel in the photographing position. A disengagement member releases engagement of the barrier driving member with the driving member when the barrier unit is mounted to the lens barrel.
REFERENCES:
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patent: 4341450 (1982-07-01), Shigoku
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patent: 4843411 (1989-06-01), Wakabayashi et al.
patent: 4944030 (1990-07-01), Haraguchi et al.
patent: 4989027 (1991-01-01), Ishii et al.
Asahi Kogaku Kogyo Kabushiki Kaisha
Han J. K.
Hix L. T,.
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