Compact zoom lens

Details Compact zoom lens Compact zoom lens

1987-06-18

1989-08-08

Arnold, Bruce Y.

350423, G02B 1516

Patent

active

048546844

ABSTRACT:
A compact zoom lens comprises, from front to rear, a first lens unit for focusing having a positive refractive power, a second lens unit having a negative refractive power and axially movable for varying the image magnification, a third lens unit axially movable for compensating for the shift of an image plane resulting from the variation of the image magnification, and a fourth lens unit of positive refractive power having an image forming function which remains stationary relative to a focal plane. The fourth lens unit includes, from front to rear, a first lens of positive refractive power, a second lens of negative refractive power, a third lens of negative refractive power, a fourth lens of positive refractive power and a fifth lens of positive refractive power. And, in particular, a stop for determining the F-number is arranged in a space between the second and third lens units.

REFERENCES:
patent: 3477776 (1969-11-01), Price
patent: 4299454 (1981-11-01), Betensky
patent: 4451124 (1984-05-01), Basista et al.

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