Patent
1991-05-22
1992-12-15
Gellner, Michael L.
G03B 310
Patent
active
051721490
ABSTRACT:
A drive apparatus for driving an optical system of a camera in directions along an optical axis of the optical system through an electric motor. The drive apparatus is equipped with a manual ring provided in a housing of the optical system so as to be manually rotatable about the optical axis of the optical system. The manual ring is fixedly secured to a rotatable plate having a plurality of tooth portions. Also included in the drive apparatus is a rotation detector arranged to be associated with the plurality of tooth portions of the rotatable plate so as to detect the rotation of the manual ring to output a detection signal indicative of the rotation information of the manual ring. A control section is responsive to the detection signal from the rotation detector so as to output a control signal to the electric motor so that the optical system is driven at a speed corresponding to the frequency of the detection signal therefrom. This arrangement allows high-accurate position control of the optical system of the camera at a speed proportional to the rotational speed of the manual ring.
REFERENCES:
patent: 4002405 (1977-01-01), Stahl
patent: 4796045 (1989-01-01), Hamanishi et al.
patent: 4851869 (1989-07-01), Ishimaru et al.
patent: 4857951 (1989-08-01), Nakajima et al.
patent: 4896179 (1990-01-01), Watanabe et al.
Hijikata Isao
Okabe Yoichi
Sekiguchi Takaaki
Gellner Michael L.
Victor Company of Japan Ltd.
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