1989-10-25
1991-10-22
Perkey, W. B.
354439, 3542341, G03B 310, G03B 700, G03B 922
Patent
active
050600001
ABSTRACT:
A drive ring drivable by a stepping motor is normally urged by a spring to turn in one direction around a lens aperture. When not in use, the stepping motor is not subjected to the resilient force from the spring since the drive ring is locked against rotation by a ratchet wheel engaged by an engagement lever. The stepping motor is therefore not subjected to undue stresses and is prevented from malfunctioning. Consequently, focusing failures and exposure adjustment failures which could otherwise arise from malfunctioning of the stepping motor are prevented from occurring. In operation, a solenoid is energized to move the engagement lever out of engagement with the ratchet wheel, which is then freed to allow the drive ring to be turned by the stepping motor.
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Ishida Hiroyuki
Nagaoka Shinji
Ogihara Masuo
Seki Youichi
Shinozaki Nobuo
Adams Bruce L.
Perkey W. B.
Seikosha Co. Ltd.
Wilks Van C.
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