Zoom lens of rear focus type

Details Zoom lens of rear focus type Zoom lens of rear focus type

1997-11-07

1998-10-06

Epps, Georgia Y.

Optical: systems and elements

Lens

With variable magnification

359685, 359740, G02B 1514, G02B 900

Patent

active

058186468

ABSTRACT:
A zoom lens of the rear focus type is disclosed, comprising, in order from an object side, 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, wherein at least the second lens unit and the fourth lens unit are moved to vary magnification and the fourth lens unit is moved to effect focusing, and wherein an aperture stop is located in a space between the third lens unit and the fourth lens unit.

REFERENCES:
patent: 4094586 (1978-06-01), Sato et al.
patent: 4702567 (1987-10-01), Kato 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: 5299064 (1994-03-01), Hamano et al.
patent: 5430576 (1995-07-01), Hamano
patent: 5546230 (1996-08-01), Sato et al.
Patent Abstracts of Japan, vol. 95, No. 3, Apr. 28, 1995 (JP 6-337375).

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