Zoom lens barrel

Details Zoom lens barrel Zoom lens barrel

1981-10-27

1984-09-18

Corbin, John K.

G02B 710, G02B 1518

Patent

active

044720319

ABSTRACT:
A zoom lens barrel in which a holding ring for the foremost lens group has a threaded portion for mounting accessories thereon and is capable of movement along the optical axis but is held against rotational movement, so that the orientation of the accessories about the optical axis does not change. An operating ring is coupled to the lens holding ring for movement therewith along the optical axis and is capable of rotating relative to the holding ring. Rectilinear movement of the operating ring along the optical axis moves the holding ring of the foremost lens group and a holding ring of a second lens group for zooming. Rotation of the operating ring causes axial movement of the holding ring of the first lens group and simultaneously causes axial movement of the operating ring itself.

REFERENCES:
patent: 4273423 (1981-06-01), Uesugi
patent: 4275952 (1981-06-01), Uesugi
patent: 4315670 (1982-02-01), Shigoku
patent: 4340280 (1982-07-01), Isobe

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