Zoom lens

Details Zoom lens Zoom lens

1996-10-30

1998-05-12

Epps, Georgia Y.

Optical: systems and elements

Lens

With variable magnification

359683, 359708, G02B 1514, G02B 302

Patent

active

057514976

ABSTRACT:
A high range zoom lens is disclosed, comprising, from front to rear, a first lens unit of positive refractive power, a second lens unit of negative refractive power, a third lens unit of positive or negative refractive power and a fourth lens unit of positive refractive power, the second and third lens units being movable for zooming, wherein an aspheric surface is introduced into the second or third lens unit at a specified location so that the variation of aberrations with zooming is as far reduced for high performance as possible.

REFERENCES:
patent: 4634237 (1987-01-01), Aono et al.
patent: 4934795 (1990-06-01), Estelle
patent: 5191476 (1993-03-01), Sato
patent: 5193030 (1993-03-01), Nozaki et al.
patent: 5315438 (1994-05-01), Shibata

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