Zoom lens

Details Zoom lens Zoom lens

1984-06-20

1986-12-16

Corbin, John K.

G02B 1514

Patent

active

046292942

ABSTRACT:
A zoom lens includes, from front to rear, a positive first component, a negative second component, a positive third component and a positive or negative fourth component. The first, third and fourth components are movable to vary the focal length of the entire system. In the wide angle position, the image modification of the third component contributes to the ratio of the focal length of the third component to the focal length of the fourth component, and the ratio of that fraction of the zoom ration of the entire system which the second component assumes to the zoom ratio of the entire system, satisfies specific conditions such that minimization of the bulk and size of the zoom lens and a stabilized correction of aberrations are achieved.

REFERENCES:
patent: 4523814 (1985-06-01), Okudaira

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