Method for manufacturing optical glass element

摘要

A method for manufacturing an optical glass element, comprising: annealing a press-molded product obtained by press molding into a lens shape a glass material comprised of a core portion comprised of an optical glass (first glass) with a transition temperature of 550° C. or higher and a covering portion comprised of a second glass covering the surface of said core portion; and then removing the covering layer from the surface of the press-molded product to obtain an optical glass element. To provide a method for manufacturing high-optical-performance mold-pressed lenses in which the defective external appearance of optical elements comprised of high-temperature glass materials with a Tg of 550° C. or higher is prevented.

主权项

1. A method for manufacturing an optical glass element, comprising:
annealing a press-molded product obtained by press molding into a lens shape a glass material comprised of a core portion, comprised of an optical glass (the “first glass” hereinafter) with a transition temperature of 550° C. or higher and comprising B2O3 and La2O3, and a covering portion that is comprised of a second glass covering the surface of said core portion and ranges from 0.1 to 1,000 nm in thickness; and then removing the covering layer from the surface of the press-molded product to obtain an optical glass element by etching, wherein an etching rate of said second glass by an acid or alkali treatment is greater than an etching rate of said first glass, and wherein said second glass comprises one or more from among La2O3, Y2O3, Sc2O3, Gd2O3, Lu2O3, ZrO2, and HfO2.