Optical congruence comparator

Details Optical congruence comparator Optical congruence comparator

1976-07-21

1977-08-09

Corbin, John K.

Optics: measuring and testing

Refraction testing

Prism engaging specimen

350 30, G02B 2118

Patent

active

040407462

ABSTRACT:
To prevent spurious distortion of the image upon mechanical distortion of a cross slide upon movement of the cross slide, a slide carrier is arranged to support the objects to be compared in superposed relation; a microscope optic and deflection optics form superimposed images of the respective objects, the microscope optics including two channels which have objective planes parallel to the imaging planes for measuring the objects. In accordance with the invention, the focal length of the microscope objective in one channel is equal to one-half the distance of the superimposed corresponding elemental areas of the objects to be compared, the optic generating an image of the areas to be compared which is at, or close to infinity. A plane mirror is rigidly connected to the carrier, the mirror plane thereof extending parallel to the imaging planes, so that small rotary distortion of the carrier will not interfere with congruence of corresponding elemental areas.

REFERENCES:
patent: 2950649 (1960-08-01), Horn
patent: 3667848 (1972-06-01), Percival

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