Zoom lens barrel

Details Zoom lens barrel Zoom lens barrel

1998-08-27

2000-11-14

Mack, Ricky

Optical: systems and elements

Lens

With variable magnification

359701, G02B 1514

Patent

active

061478148

ABSTRACT:
A zoom lens barrel is a lens barrel having a plurality of lens groups that change intervals in the direction of an optical axis at the time of a zooming operation and move in one-piece toward the optical axis at the time of a focusing operation thereby fixing the mutual intervals in the direction of the optical axis. Furthermore, the zoom lens barrel drives a second group lens frame toward the optical axis via a cam follower by a three-dimensional cam that rotates around the optical axis at the time of the zooming operation and moves toward the optical axis at the time of the focusing operation to perform zooming or focusing. According to this zoom lens barrel, it becomes possible to make the radial size small and further to easily maintain good optical performance.

REFERENCES:
patent: 5461443 (1995-10-01), Nakayama et al.
patent: 5467224 (1995-11-01), Nomura
patent: 5661609 (1997-08-01), Asakura et al.
patent: 5739962 (1998-04-01), Asakura et al.

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