1989-03-21
1990-10-16
Arnold, Bruce Y.
350255, 354400, G02B 702
Patent
active
049630008
ABSTRACT:
A lens barrel includes a vibratory-wave motor whose stator is in frictional contact with its rotor and which has a hollow core to admit passage of a light beam, a lens group held by an axially movable lens holder, a drive mechanism for axially moving the lens holder, a rotatable manual ring, and a clutch for selecting either one of the rotor and the manual ring to transmit its rotation to the drive mechanism, the clutch having a plurality of axially movable members arranged upon movement in a direction to establish a transmission for the rotation of the rotor to the drive mechanism or upon movement to the opposite direction to establish a transmission for the rotation of the manual ring to the drive mechanism.
REFERENCES:
patent: 4560263 (1985-12-01), Katsuma et al.
patent: 4660933 (1987-04-01), Notagashira et al.
patent: 4793689 (1988-12-01), Aoyagi et al.
patent: 4806000 (1989-02-01), Shiokama et al.
patent: 4864344 (1989-09-01), Arakawa et al.
Arnold Bruce Y.
Ben Loha
Canon Kabushiki Kaisha
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