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:
Sep. 21, 2010
Filed:
Jul. 15, 2009
Naomi Shida, Tokyo, JP;
Masaaki Tamatani, Fujisawa, JP;
Yoshihito Tsutsui, Chigasaki, JP;
Kazuaki Ootsuka, Yokosuka, JP;
Ryosuke Hiramatsu, Kawasaki, JP;
Naomi Shida, Tokyo, JP;
Masaaki Tamatani, Fujisawa, JP;
Yoshihito Tsutsui, Chigasaki, JP;
Kazuaki Ootsuka, Yokosuka, JP;
Ryosuke Hiramatsu, Kawasaki, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Toshiba Materials Co., Ltd., Tokyo, JP;
Abstract
A method for manufacturing a fluorescent substance is provided, which includes mixing a raw material for Eu, a raw material for Si, at least one raw material powder of alkaline earth, and at least one selected from the group consisting of raw materials for La , Gd, Cs, and K to obtain a mixture of raw materials; pre-firing the mixture to obtain a baked material; mixing the baked material and firing in a reducing atmosphere consisting of a mixed gas of N2/H2 to obtain a first fired product; pulverizing the first fired product to obtain a pulverized first fired product; firing the pulverized first fired product in a reducing atmosphere consisting of N2/H2 to obtain a fluorescent substance consisting of an alkaline earth ortho-silicate; pulverizing the fluorescent substance to obtain a fluorescent particle; sieving the fluorescent particle; and providing a surface-covering material on a surface of the fluorescent particle.