Zoom lens system

Details Zoom lens system Zoom lens system

1996-08-29

1999-10-12

Epps, Georgia

Optical: systems and elements

Lens

With variable magnification

359683, G02B 1514

Patent

active

059662450

ABSTRACT:
A zoom lens system composed, in order from the object side, of a first lens unit which has a positive refractive power and is kept stationary during a change of a magnification, a second lens unit which has a negative refractive power and is movable for the change of the magnification, a third lens unit which has a positive refractive power and is kept stationary during the change of the magnification, a fourth lens unit which has a positive refractive power and is movable during the change of the magnification, and a fifth lens unit which has a negative refractive power and is kept stationary during the change of the magnification; and using an aspherical surface or aspherical surfaces in the lens units which are kept stationary during the change of the magnification.

REFERENCES:
patent: 5202992 (1993-04-01), Banno et al.
patent: 5241420 (1993-08-01), Yamanashi
patent: 5299064 (1994-03-01), Hamano et al.
patent: 5546230 (1996-08-01), Sato

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