Objective comprising aspherical surfaces, whose focal length is

Details Objective comprising aspherical surfaces, whose focal length is Objective comprising aspherical surfaces, whose focal length is

1980-09-29

1983-11-22

Corbin, John K.

350432, G02B 1318, G02B 1514

Patent

active

044165188

ABSTRACT:
The objective comprises a plurality of movable lens components and at least one stationary lens component group, at least two of said components including an aspherical surface. The movable components are constituted by single lenses of which at least one lens comprises an aspherical surface, while the stationary lens component group(s) may comprise at least one aspherical surface. Steadiness of the image plane is obtained by mechanical compensation for focal-length variations with a ratio greater than five, which may readily reach the value eight. The aspherical lenses are arranged so that for the same focal length variation the total number of lenses of the objective, which may be spherical or non-spherical, is smaller than in any other variable-focus objective with a stationary image plane comprising solely spherical lenses:

REFERENCES:
patent: 4043641 (1977-08-01), Gottlieb

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