Process for the production of glass molded article
AssigneeHoya Corporation
InventorsKazutaka Hayashi, Hiromasa Tawarayama, Xuelu Zou, Hiroshi Kawazoe
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Abstract
Provided are a process for the production of a precision press-molded article having a high transmittance and a method of treating a glass to color or decolor the glass, the process comprising heat-treating a press-molded article containing at least one selected from WO3, Nb2O5 or TiO2 in an oxidizing atmosphere to produce a glass molded article, and the method comprising heat-treating a colored glass containing at least one oxide of WO3 and Nb2O5 in an oxidizing atmosphere to decolor the glass, or heat-treating a glass containing at least one oxide selected from WO3, Nb2O5 or TiO2 in a non-oxidizing atmosphere to color the glass.
Claims20
A process for producing a glass molded article by precision press-molding a glass under heat in a non-oxidizing atmosphere,
- the process comprising precision press-molding a glass containing P2O5 and at least one oxide selected from WO3, Nb2O5 or TiO2, to prepare a glass molded article, and then heat-treating the glass molded article in an oxidizing atmosphere having the partial pressure of water vapor adjusted to 104 Pa or lower to decolor the glass molded article.
A process for producing a glass molded article by precision press-molding a glass under heat in a non-oxidizing atmosphere,
- the process comprising precision press-molding a glass containing P2O5 and at least one oxide selected from WO3, Nb2O5 or TiO2 and having an Sb2O3 content of 2,000 ppm or less and an As2O3 content of 200 ppm or less to prepare a glass molded article, and then heat-treating the glass molded article in an oxidizing atmosphere to decolor the glass molded article.
A process for producing a glass molded article by precision press-molding a glass under heat in a non-oxidizing atmosphere,
- the process comprising precision press-molding a preform made of a glass containing P2O5 and at least one oxide selected from WO3, Nb2O5 or TiO2 and having a surface formed of a carbon film, to prepare a glass molded article, and then heat-treating the glass molded article in atmosphere of air to decolor the glass molded article.
A process for producing a glass molded article by precision press-molding a glass under heat in a non-oxidizing atmosphere,
- the process comprising precision press-molding a glass containing P2O5 and at least one oxide selected from WO3, Nb2O5 or TiO2, containing no lead, having a WO3 and Nb2O5 total content of at least 15 mol % and having a refractive index (nd) of at least 1.6 and an Abbe's number (vd) of 33 or less, to prepare a glass molded article, and then heat-treating the glass molded article in an oxidizing atmosphere to decolor the glass molded article.
A process for producing a glass molded article by press-molding a glass under heat in a non-oxidizing atmosphere,
- the process comprising press-molding a glass containing P2O5 and at least one oxide selected from WO3, Nb2O5 or TiO2, containing no lead, having a WO3, Nb2O5 and TiO2 total content of at least 25 mol % and having a refractive index (nd) of at least 1.6 and an Abbe's number (vd) of 33 or less, to prepare a glass molded article, and then heat-treating the glass molded article in an oxidizing atmosphere to decolor the glass molded article.
A process for producing a glass molded article by precision press-molding a glass under heat in a non-oxidizing atmosphere,
- the process comprising precision press-molding a glass containing P2O5 and at least one oxide selected from WO3, Nb2O5 or TiO2 containing no lead, having an Sb2O3 content of 2,000 ppm or less and an As2O3 content of 200 ppm or less and having a WO3 and Nb2O5 total content of at least 15 mol % and having a refractive index (nd) of at least 1.6 and an Abbe's number (vd) of 33 or less, to prepare a glass molded article, and then heat-treating the glass molded article in an oxidizing atmosphere to decolor the glass molded article.
Dependencies are inferred from the claim text.