Organic lens mould method with process for making a countersink

Details Organic lens mould method with process for making a countersink Organic lens mould method with process for making a countersink

1991-03-22

1992-04-21

Schor, Kenneth M.

Glass manufacturing

Processes

Fusion bonding of glass to a formed part

165 54, 165 61, 165 36, 165 37, 425808, 512831, 264219, 264 25, C03C 1900, B29D 1100

Patent

active

051064030

ABSTRACT:
A method of producing a blank for the primary member of a glass mould in which an organic polymer, multifocal, ophthalmic lens is cast. A glass major element is formed that has a raised countersink zone on one surface, the remainder of the glass major element being thinner than the countersink zone, but of such thickness that it can form the far vision surface of a mould. A countersink is formed in the countersink zone and a segment element is formed and fused in the countersink. This forms a lens mould assembly which, when ground and polished to the predetermined far vision curvature and countersink size, produces a mould in which an organic lens may be cast.

REFERENCES:
patent: 901579 (1908-10-01), Wilhelm
patent: 1886649 (1961-11-01), Culver
patent: 2057179 (1936-10-01), Bausch
patent: 2885829 (1959-05-01), Emerson
patent: 3130029 (1964-04-01), Cala
patent: 4163655 (1979-08-01), Campbell
patent: 4906422 (1990-03-01), Buckley

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