Motor-driven zoom lens barrel

Details Motor-driven zoom lens barrel Motor-driven zoom lens barrel

1991-02-06

1992-09-15

Gellner, Michael L.

G03B 310

Patent

active

051481995

ABSTRACT:
A motor-driven zoom lens barrel including a zoom motor, a powered zooming mechanism which varies the focal length of a taking lens in accordance with the rotation of the zoom motor in the forward and reverse directions, a zoom operation ring which can be rotated, a rotational direction control circuit for rotating the zoom motor in the forward and reverse directions in accordance with the rotation of the zoom operation ring in the forward and reverse directions from a neutral position thereof, and a speed control circuit for controlling the rotational speed of the zoom motor in accordance with the angular displacement of the zoom operation ring from the neutral position.

REFERENCES:
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patent: 4676605 (1987-06-01), Toda et al.
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patent: 4851869 (1989-07-01), Ishimaru et al.
patent: 4896179 (1990-01-01), Watanabe
French Search Report and Annex, Application No. 9,101,458, Jul. 17, 1991.
Copy of United Kingdom Search Report, Application No. 9102621.1, Apr. 23, 1991.

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