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Title:
OPTICAL GLASS, PREFORM, AND OPTICAL ELEMENT
Document Type and Number:
WIPO Patent Application WO/2018/066577
Kind Code:
A1
Abstract:
Provided is an optical glass which has optical properties including a high refractive index and high dispersibility, and can contribute to the correction of the influence of the change in temperature on image formation properties. The optical glass contains, in % by mass, a B2O3 component in an amount of more than 0% and equal to or less than 35.0%, a Ln2O3 component (wherein Ln represents at least one element selected from the group consisting of La, Gd, Y and Yb) in a total amount of 1.0 to 50.0% inclusive, and a BaO component in an amount of 10.0 to 50.0% inclusive, wherein the total mass of TiO2 + ZrO2 + WO3 + Nb2O5 + Ta2O5 is more than 0% and equal to or less than 50.0%. The optical glass has a refractive index of 1.75 or more and an Abbe's number of 18 to 42 inclusive, wherein the temperature coefficient (40 to 60ºC) of a relative refractive index (589.29 nm) falls within the range from +4.0 × 10-6 to -10.0 × 10-6 (ºC-1).

Inventors:
OGINO MICHIKO (JP)
Application Number:
JP2017/036033
Publication Date:
April 12, 2018
Filing Date:
October 03, 2017
Export Citation:
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Assignee:
OHARA KK (JP)
International Classes:
C03C3/068; C03C3/15; G02B1/00
Domestic Patent References:
WO2011065097A12011-06-03
Foreign References:
JP2011153048A2011-08-11
JP2004175632A2004-06-24
JP2007022846A2007-02-01
US20140287906A12014-09-25
JPS58125637A1983-07-26
JPS5950048A1984-03-22
JPH05262533A1993-10-12
JP2007153734A2007-06-21
JP2000128568A2000-05-09
JP2005179142A2005-07-07
JP2006225220A2006-08-31
JPS6042245A1985-03-06
JP2012229135A2012-11-22
Attorney, Agent or Firm:
SHOBAYASHI Masayuki et al. (JP)
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