Edge processing of chemically toughened lenses

Details Edge processing of chemically toughened lenses Edge processing of chemically toughened lenses

1975-04-07

1976-09-21

Bashore, S. Leon

Glass manufacturing

Processes

With chemically reactive treatment of glass preform

65 61, 51101LG, 51284, C03C 1500, C03C 1900, B24B 700, B24B 100

Patent

active

039817091

ABSTRACT:
In a toughened lens which has been subjected to chemical tempering process and then to edge grinding, the fracture strength can be greatly enhanced if the peripheral portion is chamfered with the angle of chamfering to the tangential line on the optical surface of the lens not greater than 45.degree.. This toughened effect is further increased by subjecting the chamfered peripheral portion to such a post treatment as mechanical polishing, chemical etching or thermal polishing.

REFERENCES:
patent: 1766509 (1930-06-01), Grambach
patent: 1852840 (1932-04-01), Fuwa et al.
patent: 2329713 (1943-09-01), Goddu
patent: 2372536 (1945-03-01), Walker
patent: 2971294 (1961-02-01), Hohmann
patent: 3543402 (1970-12-01), Seager
patent: 3555663 (1971-01-01), Forman
patent: 3843343 (1974-10-01), Okada et al.

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