Method for producing a curved glass die having an aspherical pol

Details Method for producing a curved glass die having an aspherical pol Method for producing a curved glass die having an aspherical pol

1975-03-25

1977-04-19

Bashore, S. Leon

Glass manufacturing

Processes

With shaping of particulate material and subsequent fusing...

65 68, 65107, 65 61, 264 1, 351177, C03B 914, C03B 2100, G02B 100, B29D 1100

Patent

active

040185877

ABSTRACT:
A method of making a glass die for moulding progressive concave-convex ophthalmic lenses of organic glass, i.e. of synthetic polymeric material, which have their convex surface of aspheric shape, wherein a glass blank for the die is formed with its convex surface of aspheric shape and is then supported on a support member having a concave spherical support surface while being heated to a temperature at which the glass deforms without flowing, so that the convex surface sags to conform with the spherical support surface and the aspheric character is transferred to the concave surface.

REFERENCES:
patent: 901659 (1908-10-01), Stevens
patent: 1619341 (1927-03-01), Gagnon
patent: 2015007 (1935-09-01), Emerson
patent: 2394934 (1946-02-01), Orser et al.
patent: 2482698 (1949-09-01), Tillyer
patent: 2890486 (1959-06-01), Crandon
patent: 3297422 (1967-01-01), Emerson et al.
patent: 3889431 (1975-06-01), Johnson
patent: 3946982 (1976-03-01), Calkins et al.

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