Compact zoom lens

Details Compact zoom lens Compact zoom lens

1985-02-26

1987-05-19

Corbin, John K.

350432, G02B 964, G02B 1514

Patent

active

046662570

ABSTRACT:
A compact zoom lens including, from front to rear, a first lens unit of positive power, a second lens unit of negative power, a third lens unit of positive power and, if desired, further a fourth lens unit, with the separations between the first and second units, between the second and third units and between the third and fourth units being made variable to vary the focal length of the entire system, wherein as the focal length is varied from the shortest to the longest value, the first and third units move axially forward, and the third unit is provided with a positive lens having an aspherical surface.

REFERENCES:
patent: 4465342 (1984-08-01), Tanaka et al.
patent: 4506958 (1985-03-01), Imai
patent: 4523814 (1985-06-01), Okudaira

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