Zoom lens barrel

Details Zoom lens barrel Zoom lens barrel

1988-12-16

1990-12-04

Arnold, Bruce Y.

350430, 35419512, G02B 1500

Patent

active

049749498

ABSTRACT:
A zoom lens barrel wherein first and second lens groups are moved through different distances along an optical axis in interlocking relation to each other to effect zooming. A device for supporting the second lens group is supported by a device for supporting the first lens group in such a manner that the second lens group supporting device is movable along the optical axis relative to the first lens group supporting device. When a drive ring for driving the first lens group supporting device is activated, the first lens group supporting device is moved forward or rearward along the optical axis in response to the rotation of the drive ring and, at the same time, a drive cam device for driving the second lens group supporting device to move along the optical axis relative to the first lens group supporting device is caused to rotate around the optical axis by the drive ring.

REFERENCES:
patent: 4074931 (1978-02-01), Okudaira
patent: 4275952 (1981-06-01), Uesugi
patent: 4445756 (1984-05-01), Komoto
patent: 4472031 (1984-09-01), Muryoi
patent: 4726667 (1988-02-01), Tachihara

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