Compact zoom lens

Details Compact zoom lens Compact zoom lens

1980-04-10

1982-09-21

Arnold, Bruce Y.

G02B 1516

Patent

active

043504167

ABSTRACT:
A compact zoom lens of mechanical compensation type is described which comprises first, second, third and fourth lens groups arranged so that variation of image position caused when the second lens group is moved along the optical axis for the purpose of varying the focal length is compensated by moving the third lens group so as to form a locus of points concave toward the object side. The zoom lens as a whole is made compact by compactly arranging the vari-focal lens groups, which comprise the first through third lens groups, by making the amounts of movements of the second and third lens groups small and by arranging the vari-focal lens group itself so that the focal length of the fourth lens group becomes short.

REFERENCES:
patent: 4025167 (1977-05-01), Ikeda

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