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Patent Searching and Data


Title:
OPTICAL GLASS AND OPTICAL ELEMENT
Document Type and Number:
WIPO Patent Application WO/2021/060362
Kind Code:
A1
Abstract:
[Problem] To provide an optical glass having a low temperature coefficient of the relative refractive index (dn/dT) thereof due to temperature change and a large average linear thermal expansion coefficient, and an optical element that comprises the optical glass. [Solution] An optical glass having a refractive index nd of 1.63-1.80, an Abbe number νd of 22-34, a Nb2O5 content of 25-55 mass%, a WO3 content of less than 30 mass%, a total content [TiO2 + Nb2O5 + WO3 + Bi2O3 + Ta2O5] of TiO2, Nb2O5, WO3, Bi2O3, and Ta2O5 of 36-60 mass%, a mass ratio [(TiO2 + Nb2O5 + WO3 + Bi2O3 + Ta2O5)/(P2O5 + B2O3 + SiO2 + Al2O3 + Li2O + Na2P + K2O + Cs2O)] of the total content of TiO2, Nb2O5, WO3, Bi2O3, and Ta2O5 to the total content of P2O5, B2O3, SiO2, Al2O3, Li2O, Na2O, K2O, and Cs2O of 1.10 or less, and a mass ratio [TiO2/(P2O5 + B2O3)] of the content of TiO2 to the total content of P2O5 and B2O3 of 0.50 or less, and satisfying (A) or (B).

Inventors:
KUWATANI SHUNGO (JP)
Application Number:
PCT/JP2020/035992
Publication Date:
April 01, 2021
Filing Date:
September 24, 2020
Export Citation:
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Assignee:
HOYA CORP (JP)
International Classes:
C03C3/062; C03C3/064; C03C3/19; C03C3/21; G02B1/00
Foreign References:
JP2014185075A2014-10-02
JP2002293572A2002-10-09
JPH08157231A1996-06-18
JP2011230991A2011-11-17
JP2019019011A2019-02-07
Attorney, Agent or Firm:
MAEDA & SUZUKI (JP)
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