Method for manufacturing an optical element

Details Method for manufacturing an optical element Method for manufacturing an optical element

1996-02-09

1998-06-02

Vargot, Mathieu D.

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Including step of mold making

216 24, 216 26, 264 136, 425810, B29D 1100

Patent

active

057594570

ABSTRACT:
An aspherical lens, which is to be used as an objective lens for an optical pickup of an optical disc apparatus, has at least one optical functional surface of the lens formed to be rotationally asymmetric so as to generate astigmatism of axial wavefront aberration for cancelling off-axis astigmatism. The lens is manufactured by press molding an optical material such as glass or resin. At least one of the dies is formed by etching a rotationally symmetric surface of a base material, unevenly. Thereby, the etched surface becomes rotationally asymmetrically aspherical in shape.

REFERENCES:
patent: 5015280 (1991-05-01), Kimoto et al.
patent: 5338178 (1994-08-01), Kato et al.
patent: 5348616 (1994-09-01), Hartman et al.
patent: 5389313 (1995-02-01), Imataki et al.

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