Variable focal length optical system of super-high magnification

Details Variable focal length optical system of super-high magnification Variable focal length optical system of super-high magnification

1975-06-04

1976-11-16

Corbin, John K.

350187, G02B 1500

Patent

active

039920836

ABSTRACT:
A variable focus objective lens having a magnification range in the order of 1 : 30 and greater and having two pairs of relatively movable members which objective consists of a front assembly and a rear assembly which includes one of the two pairs of movable members to which consecutive zooming movement is imparted. This is done in order to add a varifocal range to a varifocal range of zooming movement of the movable members of the front assembly, in association with a control mechanism of simple structure incorporated in barrels of the lens mount therefor.

REFERENCES:
patent: 3015988 (1962-01-01), Hemstreet
patent: 3081671 (1963-03-01), Cook
patent: 3603726 (1971-09-01), Garber et al.
patent: 3619035 (1971-11-01), Hopkins

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