Macro zoom lens barrel

Details Macro zoom lens barrel Macro zoom lens barrel

Filed on

1981-10-02

Date issued

1983-12-20

Examiner

Henry, Jon W.

Other Related Categories

350430, G02B 710

Type

Patent

Status

active

Patent number

044213891

Description

ABSTRACT:
A zoom lens barrel having a single operating ring for effecting focusing by rotating operation of the operating ring about the optical axis with respect to a fixed portion and zooming by moving operation of the operating ring in the direction of the optical axis includes means provided between the operating ring and the fixed portion for limiting the operations by the operating ring. The limiting means impedes the focusing with respect to an object lying at a shorter distance than a predetermined distance when the operating ring is in a position corresponding to a short focal length with a predetermined focal length as the boundary and impedes the zooming to the short focal length when the operating ring is in a position corresponding to the focusing with respect to the object lying at the shorter distance.

REFERENCES:
patent: 4097124 (1978-06-01), Watanabe et al.
patent: 4162822 (1979-07-01), Nonogaki
patent: 4171880 (1979-10-01), Mori et al.

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