Variable magnification optical system

Details Variable magnification optical system Variable magnification optical system

1984-05-04

1985-12-24

Corbin, John K.

350446, G02B 1516, G02B 1700

Patent

active

045602425

ABSTRACT:
A variable magnification optical system includes two movable groups of the so-called symmetric orthometer type each of which includes a positive power lens, a negative power lens and a meniscus positive lens that are in sequence disposed symmetrically with respect to a diaphragm, said optical system further including negative lenses mounted outside said movable groups symmetrically with respect to said diaphragm to form a fixed group, said movable groups being moved along the optical axis relative to said fixed group in symmetrical fashion with respect to said diaphragm to vary the focal length of said optical system, the entire optical system being moved as one body to bring the object and image planes into a position that they are optically conjugate with each other.

REFERENCES:
patent: 3687522 (1972-08-01), Lynch et al.
patent: 3728010 (1973-04-01), Mikami
patent: 3731990 (1973-05-01), Van Orden
patent: 4037937 (1977-07-01), Minoura
patent: 4061419 (1977-12-01), Price et al.
patent: 4149774 (1979-04-01), Hirano et al.

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