Zoom lens capable of selecting a focal length beyond a standard

Details Zoom lens capable of selecting a focal length beyond a standard Zoom lens capable of selecting a focal length beyond a standard

1985-10-01

1989-09-12

Kyle, Deborah L.

350427, G02B 1500

Patent

active

048654345

ABSTRACT:
A zoom lens including, from front to rear, a first lens unit of positive power, a second lens unit of negative power and a third lens unit of positive power, wherein for a standard focal length range at least the first and second lens units move simultaneously and independently of each other, and to obtain a focal length beyond the standard range, at least the second lens unit moves, whereby the locus of movement of the first lens unit bends at an end of the standard range, and as the standard range is exceeded, the first lens unit either remains stationary or moves forward.

REFERENCES:
patent: 3481666 (1969-12-01), Higuchi
patent: 3661445 (1972-05-01), Someya
patent: 4178076 (1979-12-01), Tsuji et al.
patent: 4256371 (1981-03-01), Someya
patent: 4298251 (1981-11-01), Hartmann

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