Electricity: motive power systems – Motor-reversing – Armature or primary circuit control
Patent
1992-07-29
1994-04-19
Gellner, Michael L.
Electricity: motive power systems
Motor-reversing
Armature or primary circuit control
354400, 318257, G03B 118, G03B 1318, H02P 100
Patent
active
053050380
ABSTRACT:
A zoom lens camera including a zoom taking lens having a zooming function, a motor for driving the zoom taking lens, a telephoto switch which is actuated to effect the motor to drive the zoom taking lens in a manner that increases the focal length thereof, a wide angle switch which is actuated to effect the motor to drive the zoom taking lens in a manner that decreases the focal length thereof, and a zooming speed controller for varying the zooming speed of the zoom taking lens when a predetermined condition is satisfied during the zooming operation when one of the telephoto switch or wide angle switch is actuated.
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patent: 5019765 (1991-05-01), Ogasawara
patent: 5136320 (1992-08-01), Kobayashi et al.
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patent: 5148201 (1992-09-01), Umetsu et al.
patent: 5198847 (1993-03-01), Takahashi
United Kingdom Search Report, Short, Oct. 5, 1992.
Asahi Kogaku Kogyo Kabushiki Kaisha
Gellner Michael L.
Noh Jae N.
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