Method of making multifocal lens blanks

Details Method of making multifocal lens blanks Method of making multifocal lens blanks

1987-11-03

1989-06-27

Lindsay, Robert L.

Glass manufacturing

Processes

Fusion bonding of glass to a formed part

65 3011, 65 39, C03B 1108

Patent

active

048426326

ABSTRACT:
There is disclosed an improved method of assembling and fusing the segment and major elements of a multifocal lens blank that employs glass spacer members to space the segment from the major element and allow the segment to progressively slump into sealing relationship with the major as fusion temperature is approached. The glass spacer member has a softening point that is lower than that of the major element glass and may approximate that of the segment glass.

REFERENCES:
patent: 865363 (1907-09-01), Dieckmann
patent: 1190242 (1916-07-01), Hill
patent: 1436217 (1922-11-01), Tillyer
patent: 1596397 (1926-08-01), Bugbee, Jr.
patent: 1734428 (1929-11-01), Haering
patent: 2640299 (1953-06-01), Sheard et al.
patent: 3966311 (1976-06-01), Korn et al.
patent: 4190451 (1980-02-01), Hares et al.

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