Zoom lens

Details Zoom lens Zoom lens

2005-09-06

2005-09-06

Epps, Georgia (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

Reexamination Certificate

active

06940657

ABSTRACT:
A zoom lens includes, in order from the object side, a first lens unit with positive refracting power, a second lens unit with positive refracting power, and a third lens unit with negative refracting power. In the magnification change of the zoom lens ranging from a wide-angle position to a telephoto position, individual lens units are moved toward the object side and thereby the magnification change is carried out. The first lens unit has a single positive lens and a single negative lens; the second lens unit has, in order from the object side, a first positive lens with a concave surface facing the object side and a second positive lens with a concave surface facing the object side; and the third lens unit has, in order from the object side, a plastic lens with aspherical surfaces and a negative lens. An aperture stop is located on the object side of the second lens unit.

REFERENCES:
patent: 5361167 (1994-11-01), Aoki
patent: 10020193 (1998-01-01), None
patent: 10-090600 (1998-04-01), None
patent: 11-119098 (1999-04-01), None
patent: 2000-275524 (2000-10-01), None

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