Method of manufacturing an optical element having an aspheric su

Details Method of manufacturing an optical element having an aspheric su Method of manufacturing an optical element having an aspheric su

1984-12-18

1986-11-18

Lowe, James

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Composite or multiple layer

425808, B29D 1100

Patent

active

046234969

ABSTRACT:
For manufacturing monaspherical lenses, a correction layer of a synthetic resin is provided on a substrate having a spherical surface. In this method, centering is performed by using the curvature of the surface of the matrix. With a correct choice of the radius of curvature of the substrate surface, the substrate approaches the matrix most closely near a collection of inflection points in the matrix surface situated on a circle. A good centering without a guiding mechanism is possible by using the method according to the invention. Moreover, the differences in thickness in the correction layer are small enough to prevent shrinkage defects upon curing of the synthetic resin layer.

REFERENCES:
patent: 2253697 (1941-08-01), Genesy
patent: 2298429 (1942-10-01), Smith
patent: 2332674 (1943-10-01), Smith
patent: 2332930 (1943-10-01), Rinia
patent: 2890486 (1959-06-01), Crandon
patent: 4319945 (1982-03-01), Howdin
patent: 4432832 (1984-02-01), Fantone

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