Movement detection and control device

Details Movement detection and control device Movement detection and control device

1996-09-25

1999-03-23

Metjahic, Safet

Photography

Having variable focal length of camera objective

Power zoom

396133, G03B 1700, G03B 310, G03B 1334

Patent

active

058872035

ABSTRACT:
A movement detection and control device has a lens frame holding a lens. The lens frame is movable in a direction of an optical axis of the lens. A revolving cam moves the lens frame in the direction of the optical axis. A driving source drives the cam. A pattern-rotating member having patterns for pulse generation, is rotated by the driving source. A detector detects the patterns, and generates pulse signals in response to driving by the driving source. A control circuit counts the pulse signals, and drives the driving source in a controlled manner to move the lens frame by a predetermined amount. The revolving cam is provided with a light-sealing member for intercepting the detector from generating pulse signals in an area where the cam starts or finishes its movement.

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patent: 4963733 (1990-10-01), Spaulding
patent: 5142314 (1992-08-01), Ogawa
patent: 5243188 (1993-09-01), Hattori et al.
patent: 5508767 (1996-04-01), Kazumi et al.
patent: 5701525 (1997-12-01), Caterino et al.
patent: 5708870 (1988-01-01), Sugita et al.

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