Zoom lens of rear focus type

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

1993-07-30

1994-03-29

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359683, G02B 1514

Patent

active

052990648

ABSTRACT:
A zoom lens of the rear focus type is disclosed, comprising, in the order from the object side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power, a fourth lens unit having a positive refractive power, and a fifth lens unit having a negative refractive power, wherein zooming is performed by moving the second and fourth lens units, and focusing is performed by moving the fourth lens unit.

REFERENCES:
patent: 4702567 (1987-10-01), Kato et al.
patent: 4842385 (1989-06-01), Tanaka
patent: 4859042 (1989-08-01), Tanaka
patent: 4874231 (1989-10-01), Aono
patent: 5042927 (1991-08-01), Ogawa et al.
patent: 5126883 (1992-06-01), Sato et al.
patent: 5202922 (1993-04-01), Banno et al.

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