Autofocusing zoom lens

Details Autofocusing zoom lens Autofocusing zoom lens

1985-05-28

1988-06-07

Corbin, John K.

G02B 1520

Patent

active

047492686

ABSTRACT:
An automatic focusing zoom lens which comprises a first positive group, a second variator group, a third compensator group, and a relay lens including an autofocus detector which receives a portion of the light entering the fourth group and controls a motor which drives the compensator group to maintain focus of the lens as well as compensating or the shift in focal plane due to movement of the variator group to change the equivalent focal length of the lens.

REFERENCES:
patent: 3455628 (1969-07-01), Back
patent: 3658411 (1972-04-01), Price
patent: 3731987 (1973-05-01), Iida et al.
patent: 3840290 (1974-10-01), Betensky et al.
patent: 3972056 (1976-07-01), Tsujimoto et al.
patent: 4008951 (1977-02-01), Himmelsbach
patent: 4161756 (1979-07-01), Thomas

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