High-speed adjustable focus telephoto objective lens

Details High-speed adjustable focus telephoto objective lens High-speed adjustable focus telephoto objective lens

1975-09-04

1977-07-26

Corbin, John K.

350216, 350220, G02B 1302

Patent

active

040379353

ABSTRACT:
A telephoto objective lens comprising a normally stationary front lens group having a positive power and a rear lens group having a negative power axially movable for focusing, the front lens group including at least two positive members and at least one negative member, and the rear lens group including at least one positive member and at least one negative member. The rear lens group has a negative meniscus configuration as a whole with the first refracting surface counting from the front being convex to the front and with the rearmost surface being concave to the rear. As the objective lens is focused from the position for an object at infinity to the position for a close object, only the rear lens group is moved toward the image plane.

REFERENCES:
patent: 962920 (1910-06-01), Von Rohr
patent: 3020804 (1962-02-01), Cox et al.
patent: 3854797 (1974-12-01), Yokota
patent: 3887269 (1975-06-01), Nakagawa

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