Zoom lens

Details Zoom lens Zoom lens

1993-11-30

1996-08-13

Epps, Georgia Y.

Optical: systems and elements

Lens

With variable magnification

359714, G02B 1514, G02B 1318

Patent

active

055462308

ABSTRACT:
A 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 refractive power, a fourth lens unit of positive refractive power and a fifth lens unit of negative refractive power, the second and fourth lens units being moved to effect zooming. The first lens unit is constructed from a negative first lens and a positive second lens.

REFERENCES:
patent: 4832471 (1989-05-01), Hamano
patent: 4934796 (1990-06-01), Sugiura et al.
patent: 4988174 (1991-01-01), Horiuchi et al.
patent: 5050972 (1991-09-01), Mukaiya et al.
patent: 5134524 (1992-07-01), Hamano et al.
patent: 5138492 (1992-08-01), Hamano et al.
patent: 5202992 (1993-04-01), Banno et al.
patent: 5299064 (1994-03-01), Hamano et al.
patent: 5363242 (1994-11-01), Yokota
patent: 5414562 (1995-05-01), Ueda
patent: 5430576 (1995-07-01), Hamano et al.
patent: 5440430 (1995-08-01), Sato

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