Zoom lens barrel

Details Zoom lens barrel Zoom lens barrel

1994-12-01

1996-06-11

Epps, Georgia Y.

Optical: systems and elements

Lens

With variable magnification

359695, 359700, 359824, 35419512, G02B 1308

Patent

active

055261884

ABSTRACT:
There is disclosed a zoom lens barrel of inner focusing type, simplified in structure by the use of a surface wave motor. There are provided two biasing members of different biasing forces, in such a manner that the stator member of the surface wave motor can rotate with respect to the fixed tube member and the movable member of the surface wave motor rotates integrally with the stator member in the zooming operation. Such structure allows to dispense with a mechanical clutch for selecting the focusing or zooming operation.

REFERENCES:
patent: 4286845 (1981-09-01), Kamata
patent: 4416513 (1983-11-01), Uesugi
patent: 4749269 (1988-06-01), Nakashima et al.
Patent abstracts of Japan, vol. 10, No. 260 (P-494) Sep. 5, 1986.

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