Zoom lens barrel

Details Zoom lens barrel Zoom lens barrel

1998-11-25

2000-09-05

Ben, Loha

Optical: systems and elements

Lens

With support

359823, 359701, 359704, 396 72, 396 79, G02B 702

Patent

active

061151971

ABSTRACT:
A zoom lens barrel has a stationary barrel, a rotatable cam barrel, a straight-movable barrel, a first lens component, and a second lens component. The stationary barrel is fixed to a camera body. The rotatable cam barrel is screw-engaged with the stationary barrel and moves along the optical axis while rotating about the optical axis. The straight-movable barrel is guided straight along the optical axis by the stationary barrel and is fitted to the rotatable cam barrel so as to be movable together therewith along the optical axis and rotatable independently thereof about the optical axis. The first lens component is fixed to the straight-movable barrel. The second lens component is guided straight along the optical axis by the straight-movable barrel and is cam-coupled to the rotatable cam barrel so as to be cam-driven along the optical axis by the rotatable cam barrel.

REFERENCES:
patent: 4950060 (1990-08-01), Nagasaka
patent: 5035493 (1991-07-01), Tanaka
patent: 5037187 (1991-08-01), Oda et al.
patent: 5589987 (1996-12-01), Tanaka
patent: 5666565 (1997-09-01), Wakabayashi et al.
patent: 5721645 (1998-02-01), Iwasaki et al.
patent: 5765048 (1998-06-01), Nomura et al.

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