Zoom lens barrel

Details Zoom lens barrel Zoom lens barrel

1999-09-27

2000-09-05

Mack, Ricky

Optical: systems and elements

Lens

With variable magnification

359823, 359700, G02B 1514, G02B 0702

Patent

active

061151904

ABSTRACT:
A zoom lens barrel includes a fixed tube provided at a camera body, a first rotary tube arranged to move in an optical axis direction relative to the fixed tube and rotate around the optical axis, the first rotary tube having a helical groove formed on an inner surface thereof, a first rectilinear member disposed inside the first rotary tube and arranged to rectilinearly move in the optical axis direction integrally with the first rotary tube, a second rotary tube disposed inside the first rotary tube and arranged to rotate at the same amount of rotation as that of the first rotary tube, and a second rectilinear member disposed inside the second rotary tube, having a projecting part engaging the helical groove and prevented by the first rectilinear member from rotating around the optical axis, wherein the second rectilinear member moves in the optical axis direction according to a locus of the helical groove, thereby causing the second rotary tube to move in the optical axis direction.

REFERENCES:
patent: 5373397 (1994-12-01), Satoh et al.
patent: 5392160 (1995-02-01), Satoh et al.
patent: 5461443 (1995-10-01), Nakayama et al.
patent: 5467227 (1995-11-01), Nomura

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