Lens barrel having collapsing and extending use grooves

Details Lens barrel having collapsing and extending use grooves Lens barrel having collapsing and extending use grooves

1996-04-29

1997-11-11

Nelms, David C.

Optical: systems and elements

Lens

With variable magnification

359703, 359704, 359699, G02B 1514

Patent

active

056870299

ABSTRACT:
A lens barrel having first and second lens groups and first and second tubes. The first tube has first and second guide grooves to respectively guide the first and second groups in an optical direction. The second tube has first and second cam grooves to respectively guide the first and second lens groups, in conjunction with the first and second guide grooves, for focusing and zooming operations. A first collapsing use groove extends substantially perpendicular to the optical axis from an end of the second guide groove that is closer to an image surface to maintain the second lens group in a stationary position on the optical axis when the first lens group is collapsed toward the second lens group and when the first lens group is extended into a wide state. A second collapsing use groove extends substantially perpendicular to the optical axis from an end of the second cam groove that is closer to the image surface and overlaps the first collapsing use groove to perform the same functions as the first collapsing use groove. The first cam groove is inclined with respect to the optical axis and the second cam groove includes a wide state focusing portion extending substantially parallel to the first cam groove from an end of the second collapsing use groove portion to guide the second lens group uniformly with a movement of the first lens group for focusing of the first and second lens groups in the wide state. The second cam groove above the wide state focusing portion is a stepped groove having alternating zooming portions and focusing portions, wherein the zooming portions are inclined from the optical axis and the focusing portions are substantially perpendicular to the optical axis.

REFERENCES:
patent: 4958178 (1990-09-01), Yoshida
patent: 5196963 (1993-03-01), Sato
patent: 5373397 (1994-12-01), Satoh
patent: 5570149 (1996-10-01), Wakabayashi
patent: 5576893 (1996-11-01), Yamanouchi

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