Varifocal optical system

Details Varifocal optical system Varifocal optical system

1979-01-23

1981-05-26

Corbin, John K.

350429, G02B 1516

Patent

active

042694841

ABSTRACT:
An optical system for extremely high focal length variation comprising an attachment of variable magnification and a base objective of fixed focal length, whereby the attachment has at least four lens members which are displaceable along the optical axis with the focal length change. Viewed in the incoming direction of the light, the first and fourth displaceable lens members are displaceable according to the same movement law, and the second and third lens member are displaceable according to movement laws which are different from one another, preferably however being related to each other.

REFERENCES:
patent: 2746350 (1956-05-01), Hopkins
patent: 3771853 (1973-11-01), Nakamura
patent: 3912373 (1975-10-01), Macher
patent: 3992083 (1976-11-01), Tanaka
patent: 4149774 (1979-04-01), Hirano et al.

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