Composite glass-plastic lens blanks resistant to shaling fractur

Details Composite glass-plastic lens blanks resistant to shaling fractur Composite glass-plastic lens blanks resistant to shaling fractur

1979-05-07

1981-04-28

Corbin, John K.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

65 38, 351166, C03B 1108, G02C 702, G02C 710

Patent

active

042641560

ABSTRACT:
A glass-plastic laminated lens blank, and a molding assembly for providing such a blank by direct casting, are described, wherein the incidence of blank shaling fracture is reduced by an edge configuration which transfers the high bond stress present in the laminate from the flawed edge of the glass core to a point in the core interior which is flaw-free.

REFERENCES:
patent: 4168339 (1979-09-01), Kerko et al.

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