Zoom lens wherein at least a portion of the zoom lens moves for

Details Zoom lens wherein at least a portion of the zoom lens moves for Zoom lens wherein at least a portion of the zoom lens moves for

1994-02-03

1996-05-07

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359683, 359688, G02B 1514

Patent

active

055152040

ABSTRACT:
A zoom lens wherein a portion of the zoom lens moves for focusing has, from front to rear, a first lens unit of positive refractive power, at least a rear lens part of the first lens unit being moved to effect focusing. A plurality of lens units are provided to effect zooming, and these lens units move along an optical axis. Focusing from an infinitely distant object to an object at a minimum distance is performed by (i) moving the at least rear lens part forward, and (ii) moving one movable lens unit of the plurality of lens units forward into a space vacated by the rear lens part moving forward.

REFERENCES:
patent: 4083057 (1978-04-01), Quinn
patent: 4752121 (1988-06-01), Kitagishi
patent: 4848883 (1989-07-01), Maruyama
patent: 5059007 (1991-10-01), Tanaka
patent: 5272564 (1993-12-01), Suzuki et al.

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