Title:
GLASS, GLASS MATERIAL FOR PRESS-MOLDING, OPTICAL ELEMENT BLANK, AND OPTICAL ELEMENT
Document Type and Number:
Japanese Patent JP2021008397
Kind Code:
A
Abstract:
To provide a glass high refractive index low dispersion glass that has a refractive index nd in the range of 1.800 to 1.850 and an Abbe number νd in the range of 41.5 to 44.SOLUTION: Provided is a glass, which is an oxide glass having, in mass% representation, the total contained amount of B2O3 and SiO2 of 15 to 35 mass%, the total contained amount of La2O3, Y2O3, Gd2O3 and Yb2O3 of 45 to 65 mass%, but in which the contained amount of Yb2O3 is 3 mass% or less, the contained amount of ZrO2 is 3 to 11 mass%, and the contained amount of Ta2O5 is 5 mass% or less, and having a refractive index nd in the range of 1.800 to 1.850 and an Abbe number νd in the range of 41.5 to 44.SELECTED DRAWING: None
Inventors:
NEGISHI TOMOAKI
Application Number:
JP2020151021A
Publication Date:
January 28, 2021
Filing Date:
September 09, 2020
Export Citation:
Assignee:
HOYA CORP
International Classes:
C03C3/068; G02B1/00
Domestic Patent References:
| JP2008280235A | 2008-11-20 | |||
| JP2002284542A | 2002-10-03 | |||
| JP2014214082A | 2014-11-17 | |||
| JP2015127276A | 2015-07-09 | |||
| JP2015030631A | 2015-02-16 |
Foreign References:
| WO2010053214A1 | 2010-05-14 |
Attorney, Agent or Firm:
Patent Service Corporation Patent Office Sykes