Method for manufacturing a spectacle-glass for myopes

Details Method for manufacturing a spectacle-glass for myopes Method for manufacturing a spectacle-glass for myopes

1986-07-15

1987-11-24

Whitehead, Harold D.

Abrasive tool making process, material, or composition

Impregnating or coating an abrasive tool

B24B 100

Patent

active

047079495

ABSTRACT:
A method for manufacturing a spectacle-glass for myopes, starting for simplicity sake from a semi-finished glass, that is a glass having on the inner side, a slight concave hollowing, which comprises computing according to the desired diopter value, the required curvature, and with torus-like grinding, the so-called cross-curvature, and computing according to the desired field of view, a second curvature, whereafter the glass is arranged in a generator and a center hollowing is milled according to the basic curvature, while thereafter the glass edge around the center hollowing is milled according to said second curvature, and the center hollowing of the thus-machined glass is finished, respectively polished, by using a tool with convex radiusing which corresponds to the basic curvature, whereafter the edge is subjected to at least one finishing operation and one polishing operation by using an implement with a convex radiusing which corresponds to said second curvature, whereby moreover use is made of a resilient intermediate part between said implement and a finishing pad, respectively polishing pad.

REFERENCES:
patent: 2990664 (1961-07-01), Cepero
patent: 3897657 (1975-08-01), Smith
patent: 4640587 (1987-02-01), Henkel

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