Symmetrical lens system affording variable magnification

Details Symmetrical lens system affording variable magnification Symmetrical lens system affording variable magnification

1974-12-20

1976-08-10

Corbin, John K.

350214, G02B 1500, G02B 900

Patent

active

039738310

ABSTRACT:
A varifocal lens system comprising a pair of movable lens groups located outwardly which are symmetrical with respect to the diaphragm and a pair of stationary lens groups located inwardly from said groups which are also symmetrical with respect to the diaphragm, said movable lens group being moved axially in the symmetrically spaced relationship with respect to the diaphragm and simultaneously the entire lens system being displaced as a unit by an axial distance depending on the amount of displacement of the movable lens group to satisfy the correct image-forming conditions throughout the entire magnification range while maintaining an object plane and an image plane spaced at a fixed axial distance.

REFERENCES:
patent: 3687522 (1972-08-01), Lynch et al.
patent: 3728010 (1973-04-01), Mikami

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