Method of making concave aspheric bifocal mold component

Details Method of making concave aspheric bifocal mold component Method of making concave aspheric bifocal mold component

1994-01-18

1995-08-15

Arbes, Carl J.

Metal working

Method of mechanical manufacture

Combined manufacture including applying or shaping of fluent...

295271, 295273, 264220, 264225, 264226, B21B 146

Patent

active

054407982

ABSTRACT:
A method of making a concave aspheric mold insert by electroplating nickel over a silver release agent coating on an aspheric surface formed in a copper substrate to form a master having a convex surface which is a negative image of the aspheric surface. After the master has been separated from the substrate its convex surface is coated with a silver release agent and electroplated with nickel to form an element having a concave surface which is a replication of the aspheric surface and the opposite surface of which is convex. After the convex surface of the element has been trued to spherical shape, a slightly oversize spherical D-seg is formed in the aspheric surface. The aspheric surface is then trued to reduce the D-seg to final size to produce the insert. A number of elements are formed from the master and are provided with D-segs of different radii. In an alternative method the D-seg is formed in the spherical concave surface of a glass substrate, the spherical concave surface of which has the best fit to the desired aspheric surface.

REFERENCES:
patent: 3109696 (1963-11-01), Whitney
patent: 3428533 (1969-02-01), Pichel
patent: 3555126 (1971-01-01), Gitson
patent: 3649236 (1972-03-01), Rosenbauer
patent: 4116753 (1978-09-01), Tojyo et al.
patent: 4614624 (1986-09-01), Neefe
patent: 4659524 (1987-04-01), Neefe
Proceedings of SPIE, Intr Soc Optical Eng'r vol. 655 pp. 293-299 (1986) by Leonard E. Chaloux.

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