Title:
OPTICAL GLASS, PREFORM, AND OPTICAL ELEMENT
Document Type and Number:
WIPO Patent Application WO/2018/230124
Kind Code:
A1
Abstract:
Provided are: an optical glass which has a low temperature coefficient of the relative refractive index and can contribute to correcting the effects on imaging characteristics due to temperature change; and a preform and an optical element using the same. The optical glass comprises, in mass%, 20.0 to 40.0% of a P2O5 component, 25.0 to 50.0% of a Nb2O5 component, and 3.0 to 30.0% of a mass sum (Na2O+K2O), and has a temperature coefficient (40 to 60°C) of the relative refractive index (589.29 nm) in a range of +3.0×10-6 to -10.0×10-6 (°C-1).
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Inventors:
IWASAKI NANA (JP)
Application Number:
PCT/JP2018/015070
Publication Date:
December 20, 2018
Filing Date:
April 10, 2018
Export Citation:
Assignee:
OHARA KK (JP)
International Classes:
C03C3/16; G02B1/00
Foreign References:
JP2011144063A | 2011-07-28 | |||
JP2014185075A | 2014-10-02 | |||
JP2007106611A | 2007-04-26 |
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