Lens system of variable magnification range and having a supplem

Details Lens system of variable magnification range and having a supplem Lens system of variable magnification range and having a supplem

1987-04-24

1989-02-28

Corbin, John K.

350426, G02B 1502, G02B 15177

Patent

active

048079820

ABSTRACT:
A zoom lens comprising, from front to rear, a first lens unit of negative refractive power and a second lens unit of positive refractive power, in which either by moving the second lens unit forward to vary the magnification from the wide angle side to the telephoto side, a supplementary lens system is attached on the image side of the second lens unit in the middle of the course of varying the magnification or in the zooming position of the telephoto end side, or by moving at least the second lens unit forward, the supplementary lens system is attached, to change the focal length of the entire system.

REFERENCES:
patent: 2906172 (1959-09-01), Klemt
patent: 4146305 (1979-03-01), Tanaka
patent: 4157211 (1979-06-01), Tanaka et al.
patent: 4318592 (1982-03-01), Tanaka
patent: 4330180 (1982-05-01), Tanaka

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