High zoom-ratio finite-distance zoom lens

Details High zoom-ratio finite-distance zoom lens High zoom-ratio finite-distance zoom lens

1986-09-26

1988-07-12

Corbin, John K.

G02B 1514, G02B 964

Patent

active

047566086

ABSTRACT:
A high zoom-ratio finite-distance lens with fixed object-to-image distance having arranged from the object side a first lens unit of positive focal length, a second lens unit of negative focal length and third and fourth lens units of positive focal length. The first, third and fourth lens units are moved relative to the second lens units. Conditions are set on the magnifications of the first, second and fourth lens units at the ends of the magnification range, on the relative displacements of the third and fourth lens units and on the location of the entrance pupil.

REFERENCES:
patent: 4359270 (1982-11-01), Okudaira
patent: 4629294 (1986-12-01), Tanaka et al.
patent: 4632519 (1986-12-01), Takahashi

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