Varifocal lens assembly

Details Varifocal lens assembly Varifocal lens assembly

1974-12-04

1976-07-27

Wintercorn, Richard A.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

250201, 350186, 352140, 354195, 355 57, 350187, G03B 708, G01J 120

Patent

active

039720560

ABSTRACT:
A varifocal lens assembly of a type including at least two lens groups, a first lens group being axially movable parallel to the optical axis of the varifocal lens assembly for varying the focal length of the optical system of the varifocal lens assembly. An automatic focusing device is associated with the varifocal lens assembly to axially move the lens groups as a whole, the other or second lens group or a part of lens elements of the other or second lens group a predetermined distance to compensate for the image shift which takes place during the adjustment of the focal length effected by axially moving the first lens group.

REFERENCES:
patent: 3614921 (1971-10-01), Yamanaka et al.
patent: 3631785 (1972-01-01), Perlman et al.
patent: 3678835 (1972-07-01), Takishima

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