Optical comparator

Details Optical comparator Optical comparator

1978-04-10

1979-09-25

Corbin, John K.

Optics: measuring and testing

By configuration comparison

With comparison to master, desired shape, or reference voltage

350 30, G01B 908

Patent

active

041689127

ABSTRACT:
An optical comparator which provides mirror images of a pair of similar objects being compared. One image is visible to each eye and, in the combined view, the images are of comparable portions of each object on opposite sides of a common separation line, so that any differences are readily apparent. Images of the two lighted objects, which are held in related alignment on an adjustable holder, are projected in separate optical paths through a system of reflectors to produce enlarged real images visible from a fixed eye position. A prism in one optical path inverts and reverts that image to obtain the back to back mirror images. When the holder is moved the objects are scanned across their faces and the comparable elements in the images appear to blend into or separate out from each other at the dividing line, depending on the direction of motion.

REFERENCES:
patent: 1974654 (1934-09-01), May
patent: 3695769 (1972-10-01), Mason
patent: 3744917 (1973-07-01), Craig
patent: 3892491 (1975-07-01), Kanode

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