Process for producing optical glass element

Details Process for producing optical glass element Process for producing optical glass element

2007-11-30

2010-02-23

Griffin, Steven P (Department: 1791)

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Reshaping or treatment of an optical preform

C065S066000, C065S102000, C264S001100

Reexamination Certificate

active

07666332

ABSTRACT:
To provide a production process capable of making the transmittance of an optical glass element obtainable by press-molding a TeO2-containing glass high.A process for producing an optical glass element, which comprises press-molding a TeO2-containing glass, wherein the press-molding is carried out in an atmosphere in which the nitrogen partial pressure is at most 102Pa. The above process for producing an optical glass element, wherein the face of a mold for the press-molding to be in contact with the glass is made of carbon. The above process for producing an optical glass element, wherein the molded glass obtained by the press-molding is held in an oxygen-containing atmosphere at a temperature within a range of at least a temperature lower by 50° C. than the glass transition point of the TeO2-containing glass and at most the softening point of the glass.

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Hidetsugu Mori and Hironobu Sakata, “Oxygen gas-sensing properties of V2O5-Sb2O3-TeO2 glass”, Materials Chemistry and Physics 45 (1996) 211-215.

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