Zoom lens apparatus with lens units for zooming and focusing

Details Zoom lens apparatus with lens units for zooming and focusing Zoom lens apparatus with lens units for zooming and focusing

1989-12-07

1991-05-28

Arnold, Bruce Y.

350423, 350465, G02B 1500

Patent

active

050188437

ABSTRACT:
A zoom lens barrel has a lens unit with both functions of zooming and focusing, comprises a first cyindrical member having a zoom guide groove (or zoom cam) corresponding to a zooming orbit of displacement of the lens unit with both the functions of zooming and focusing and a second cylindrical member having a focus guide groove (or focus cam) for displacing the lens unit with the functions of zooming and focusing along an optical axis for focusing. The focus guide groove or focus cam is non-linear and has an area inclined with respect to the optical axis to permit the relative displacement of the first and second cylindrical members to each other in the optical axis direction necessary for the focusing of a given object to be held substantially constant irrespective of the status of zooming and also permit the displacement of the lens unit with both the functions of zooming and focusing for focusing to be varied according to the status of zooming.

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

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