The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 01, 2022
Filed:
Jan. 09, 2020
Ohara Inc., Sagamihara, JP;
Hiroto Nojima, Kanagawa, JP;
Fumihiro Oguri, Kanagawa, JP;
OHARA INC., Sagamihara, JP;
Abstract
To provide an optical glass having the optical characteristics of a high refractive index and low dispersion, and moreover, which makes it possible to further reduce devitrification and which can be stably obtained, and a preform and an optical element using the same. The optical glass comprises, expressed in cation % (mol %), 17.0% to 42.0% of P, 7.0% to 30.0% of Al, more than 0% to 22.0% of Mg, more than 0% to 25.0% Ca, more than 0% to 30.0% of Sr, more than 0% to 35.0% Ba, and expressed in anion % (mol %), a content ratio of Fof 37.0 to 64.0%, a content ratio of Oof 36.0 to 63.0%, a refractive index (nd) of 1.48 to 1.58, and having an Abbe number (vd) of 70 to 88, and a liquidus temperature of 800° C. or less.