Zoom lens system

Details Zoom lens system Zoom lens system

1995-12-12

1998-02-17

Nelms, David C.

Optical: systems and elements

Lens

With variable magnification

359715, G02B 1514, G02B 302

Patent

active

057197083

ABSTRACT:
A compact zoom lens system which is suited for use with video cameras and has a high vari-focal ratio comprising, in order from the object side, a first positive lens unit, a second negative lens unit, and a plurality of lens units which are disposed on the image side of the second lens unit and have a positive refractive power as a whole, wherein at least two of the lens units are moved along an optical axis during zooming for changing a focal length of the zoom lens system and correcting a deviation of an image surface caused by changing the focal length, wherein a lens unit disposed at an image side location in the zoom lens system has a positive refractive power, and comprises at least one positive lens element and at least two negative lens elements, and wherein a lens element disposed at an image side location in the zoom lens system is a negative meniscus lens element having a concave surface on the image side.

REFERENCES:
patent: 4105291 (1978-08-01), Tsuji
patent: 4639096 (1987-01-01), Kitagishi et al.
patent: 4693566 (1987-09-01), Imaizumi
patent: 4695133 (1987-09-01), Kitagishi et al.
patent: 4818083 (1989-04-01), Mihara
patent: 4859042 (1989-08-01), Tanaka
patent: 5221994 (1993-06-01), Nishio
patent: 5583697 (1996-12-01), Mukaiya

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