Conversion type varifocal lens system

Details Conversion type varifocal lens system Conversion type varifocal lens system

1985-03-25

1986-06-24

Corbin, John K.

350432, 350450, 350456, 350469, G02B 934, G02B 1318, G02B 1502

Patent

active

045964475

ABSTRACT:
A conversion type varifocal lens system comprising a master lens which has a front assembly of positive power and a rear assembly of negative power, and a supplementary lens upon insertion into, or removal from, the space between the front and rear assemblies to change the focal length of the entire system.

REFERENCES:
patent: 4318592 (1982-03-01), Tanaka
patent: 4394073 (1983-07-01), Wakamiya
patent: 4466707 (1984-08-01), Ikemori et al.

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