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Title:
PRESS MOLDING GLASS MATERIAL, MANUFACTURING METHOD THEREOF, AND MANUFACTURING METHOD OF OPTICAL ELEMENT
Document Type and Number:
Japanese Patent JP2013006746
Kind Code:
A
Abstract:

To provide a press molding glass material which enables to obtain a glass molded body of a desired shape while suppressing fusion to a molding die regardless of glass deformation volume in press molding.

The press molding glass material includes: a core portion composed of optical glass; and a surface layer covering the core portion. The surface layer includes an outermost layer contacting with a molding surface of a molding die in press molding and an intermediate layer adjacent to the outmost layer, the outermost layer is a silicon oxide film having a surface free energy measured by a three-solution method of ≤75 mJ/m2 and having a film thickness of <15 nm, and the intermediate layer is a film composed of a film material having a bond-radius difference from a silicon oxide based on a stoichiometric composition of >0.10 Å, wherein in a case in which the bond-radius difference is >0.10 to 0.40 Å, a film thickness of the intermediate layer is ≤5 nm.


Inventors:
IGARI TAKASHI
YASUHIKO KENYA
Application Number:
JP2011141455A
Publication Date:
January 10, 2013
Filing Date:
June 27, 2011
Export Citation:
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Assignee:
HOYA CORP
International Classes:
C03B11/00; C03C17/34; G02B3/00
Domestic Patent References:
JP2011001259A2011-01-06
JP2005239434A2005-09-08
JP2004075529A2004-03-11
Attorney, Agent or Firm:
Patent Service Corporation Patent Office Sykes