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:
Jan. 04, 2022
Filed:
Nov. 10, 2017
Ngk Spark Plug Co., Ltd., Nagoya, JP;
NGK SPARK PLUG CO., LTD., Aichi, JP;
Abstract
An optical wavelength conversion member () provided with a ceramic plate () which is configured from a polycrystalline body that is mainly composed of AlOand a component represented by ABO:Ce; and each of A and B in ABOrepresents at least one element selected from the element groups described below. In addition, a dielectric multilayer film () which transmits a specific wavelength and reflects another specific wavelength is formed on a light incident surface () of the ceramic plate (). The ceramic plate () has a porosity of 2% by volume or less, while having an average surface roughness (an arithmetic mean roughness Sa) of 0.5 μm or less. A: Sc, Y and lanthanoids (excluding Ce) B: Al and Ga. Also disclosed is a light-emitting device including the optical wavelength conversion member.