Zoom lens system

Details Zoom lens system Zoom lens system

1996-06-28

1999-02-09

Epps, Georgia

Optical: systems and elements

Lens

With variable magnification

359683, 359684, G02B 1514

Patent

active

058702318

ABSTRACT:
A zoom lens system comprising, in order from the object side, a first positive lens unit, a second lens unit which is moved monotonously during zooming mainly for sharing a vari-focal function and has a positive power, a third positive lens unit, and a fourth lens unit which is moved during zooming forward and backward mainly for correcting a location of an image surface and has a positive power; the third lens unit consisting of a first lens component which comprises at least one positive lens element and a second lens component which comprises at least one negative lens element, whereas the fourth lens unit consisting of a first lens component which comprises at least one negative lens element and a second lens component which comprises at least one positive lens element.

REFERENCES:
patent: 5359457 (1994-10-01), Saka et al.

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