Lens barrel and optical apparatus

Details Lens barrel and optical apparatus Lens barrel and optical apparatus

1997-07-18

1999-11-02

Epps, Georgia

Optical: systems and elements

Lens

With variable magnification

359701, G02B 1514

Patent

active

059781564

ABSTRACT:
A lens barrel includes a plurality of lens units, a plurality of cams arranged to respectively cause the plurality of lens units which are being rotated around an optical axis during a focusing action to move in the optical axis direction, at least one of the plurality of cams being a range varying cam which causes a moving range of the associated lens unit to vary according to a magnification varying state, and a rotary driving member arranged to be rotated around the optical axis by a manual operation or by a motor, wherein the plurality of lens units are interlinked with the rotary driving member in such a way as to be movable in the optical axis direction relative to the rotary driving member independently of each other and rotatable integrally with the rotary driving member.

REFERENCES:
patent: 4830475 (1989-05-01), Ishiyama et al.
patent: 5144490 (1992-09-01), Yamanouchi
patent: 5373397 (1994-12-01), Satoh et al.
patent: 5715482 (1998-02-01), Wakabayahsi et al.
patent: 5751500 (1998-05-01), Bedzyk

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