Zoom lens capable of obtaining focal lengths beyond a variable f

Details Zoom lens capable of obtaining focal lengths beyond a variable f Zoom lens capable of obtaining focal lengths beyond a variable f

1985-04-17

1989-05-16

Arnold, Bruce Y.

350427, G02B 1520

Patent

active

048304778

ABSTRACT:
A zoom lens comprising, from front to rear, a first zoom section and a second zoom section, the first zoom section having a plurality of movable lens units which simultaneously move to effect zooming, and the second zoom section having a plurality of axially movable lens units, the light beam exiting from the rearmost unit in the first section enters directly the frontmost unit in the second section, and the refractive powers of the front and rear lens units are made positive and negative respectively, whereby the front and rear lens units are simultaneously moved in such a way that the magnifying power of the rear lens unit remains positive when the focal length of the entire system varies.

REFERENCES:
patent: 4132463 (1979-01-01), Sakaguchi et al.
patent: 4269484 (1981-05-01), Laurent
patent: 4437732 (1984-03-01), Ishiyama
patent: 4636040 (1987-01-01), Tokumaru
patent: 4696553 (1987-09-01), Tsuji et al.

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