Method to test for chemically hardened glass lenses

Details Method to test for chemically hardened glass lenses Method to test for chemically hardened glass lenses

1975-04-07

1977-07-12

Corbin, John K.

Optics: measuring and testing

Refraction testing

Prism engaging specimen

356 33, 356124, G01B 1116

Patent

active

040350827

ABSTRACT:
A device to test for the presence of chemically hardened glass wherein a collimated light source and a windowed container are filled with a fluid of refractive index substantially equalling that of the glass. The glass is immersed in the container with the container placed between crossed polarizers. When the glass is chemically hardened, light traversing therethrough is refractively bent thereby to produce a component of the light vector in the optical axis of one of the polarizers and an observable light pattern emanating therefrom.

REFERENCES:
patent: 3586444 (1971-06-01), Sproul et al.
patent: 3810698 (1974-05-01), Alaska
patent: 3815997 (1974-06-01), Alaska
patent: 3822096 (1974-07-01), Wilms et al.
Littman, G. "Chemical Hardening of Ophthalmic Lenses", Manufacturing Optics International, Oct. 1973, p. 489t.

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