Telescoping-type of zoom lens

Details Telescoping-type of zoom lens Telescoping-type of zoom lens

1997-01-09

1998-09-22

Epps, Georgia Y.

Optical: systems and elements

Lens

With variable magnification

359704, G02B 1514

Patent

active

058123253

ABSTRACT:
A zoom lens includes an outer barrel driven to rotate about an optical axis of the zoom lens which includes at least one first guide groove formed on an inner periphery of the zoom lens and extending in a direction of the optical axis, and an inner barrel positioned inside the outer barrel so that the outer barrel is rotatable relative to the inner barrel about the optical axis. The inner barrel includes at least one second guide groove formed on an inner periphery and extending in the direction of the optical axis. The at least one first guide groove is defined by at least one inward projection which projects inwardly from the inner periphery of the outer barrel. The at least one second guide groove is defined by an outward projection which projects outwardly from an outer periphery of the inner barrel. The at least one inward projection and the outward projection are positioned in an annular space formed between the outer barrel and the inner barrel such that a distance between the optical axis and a surface of the at least one inward projection closest to the optical axis is less than a distance between the optical axis and a surface of the outward projection farthest from the optical axis in a radial direction perpendicular to the optical axis.

REFERENCES:
patent: 3663093 (1972-05-01), Iida
patent: 3817601 (1974-06-01), Colaice et al.
patent: 4324457 (1982-04-01), Tomuri
patent: 4411498 (1983-10-01), Muryoi
patent: 4944030 (1990-07-01), Haraguchi et al.
patent: 5043752 (1991-08-01), Kohmoto
patent: 5144494 (1992-09-01), Sekiguchi
patent: 5231449 (1993-07-01), Nomura
patent: 5245476 (1993-09-01), Shono
patent: 5469300 (1995-11-01), Nomura
patent: 5488513 (1996-01-01), Tanaka
patent: 5589987 (1996-12-01), Tanaka

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