Method of blocking plastic lenses for surfacing

Details Method of blocking plastic lenses for surfacing Method of blocking plastic lenses for surfacing

1978-01-09

1979-06-19

Whitehead, Harold D.

Abrasive tool making process, material, or composition

Impregnating or coating an abrasive tool

51216LP, 51277, B24B 100

Patent

active

041582730

ABSTRACT:
An improved method and apparatus for blocking plastic lenses wherein an intermediate member in the form of a stiff, lightweight disc is interposed between the lens blank and a low melting point blocking material such that heat from the blocking material is absorbed by the member so as to prevent distortion of the lens blank. The face of the member is shaped so as to intimately conform to the standard convex side of the lens blank and is of a peripheral extent so as to provide stiffening support essentially over the entire surface thereof. The avoidance of lens distortion also enables lenses blocked in this manner to be re-blocked, if necessary, for corrective grinding.

REFERENCES:
patent: 2441472 (1948-05-01), D'Auaucourt
patent: 3383808 (1968-05-01), Deshayes
patent: 3962833 (1976-06-01), Johnson
patent: 3996701 (1976-12-01), Ramirez

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