OPTICAL GLASS, PREFORM, AND OPTICAL ELEMENT

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:

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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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