Zoom lens

Details Zoom lens Zoom lens

1997-04-04

1999-08-03

Epps, Georgia

Optical: systems and elements

Lens

With variable magnification

359684, G02B 1514

Patent

active

059332832

ABSTRACT:
A zoom lens comprises, in order from an object side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power and a fourth lens unit having a positive refractive power, wherein at least the second and fourth lens units are moved to vary magnification and the fourth lens unit is moved to effect focusing, and wherein the third lens unit is composed of one positive lens and one negative lens and an aperture stop is disposed between the positive lens and the negative lens in the third lens unit.

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patent: 5430576 (1995-07-01), Hamano
patent: 5521758 (1996-05-01), Hamano
patent: 5546230 (1996-08-01), Sato et al.
patent: 5600490 (1997-02-01), Sugawara et al.
patent: 5638216 (1997-06-01), Horiuchi et al.

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