Zoom lens barrel

Details Zoom lens barrel Zoom lens barrel

1998-10-09

2000-04-04

Sugarman, Scott J.

Optical: systems and elements

Lens

With support

359701, G02B 702

Patent

active

060468653

ABSTRACT:
A zoom lens barrel includes a zoom ring supported by a fixed barrel constituting a barrel body so as to be freely rotative; a zoom cam ring disposed inside the zoom ring in the direction of an optical axis; a first connecting portion for connecting the zoom ring and the zoom cam ring; a first lens holder which moves in the direction of an optical axis; a driving ring which is supported by the fixed barrel at a position behind a lens from the first connecting portion by the fixed barrel; a straightly moving ring which is substantially disposed in a space defined between the zoom ring and the zoom cam ring, restrained from rotating by the fixed ring; and a lens holding ring which holds a second lens, which is disposed in front of the first lens from the first connecting portion and helicoidally coupled substantially with the straightly moving ring in a space, the lens holding ring being rotatively driven by the driving ring and relatively movable in the direction of the optical axis, wherein the lens holding ring moves in the direction of the optical axis by a rotative drive of the driving ring through the straight moving ring at the time of focussing.

REFERENCES:
patent: 5760972 (1998-06-01), Fukino
patent: 5917659 (1999-06-01), Yamanouchi

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