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:
May. 07, 2013
Filed:
Feb. 24, 2011
Iwao Mitsuishi, Tokyo, JP;
Kunio Ishida, Tokyo, JP;
Yumi Fukuda, Tokyo, JP;
Aoi Okada, Tokyo, JP;
Naotoshi Matsuda, Kanagawa, JP;
Keiko Albessard, Kanagawa, JP;
Shinya Nunoue, Chiba, JP;
Iwao Mitsuishi, Tokyo, JP;
Kunio Ishida, Tokyo, JP;
Yumi Fukuda, Tokyo, JP;
Aoi Okada, Tokyo, JP;
Naotoshi Matsuda, Kanagawa, JP;
Keiko Albessard, Kanagawa, JP;
Shinya Nunoue, Chiba, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
A light emitting device includes a board and a light emitting element mounted on the board, emitting light having a wavelength of 250 nm to 500 nm. A red fluorescent layer is formed on the element and includes a red phosphor (MEu)SiAlONhaving a semicircular shape with a radius r, where M is an element that is selected from IA group elements, IIA group elements, IIIA group elements, IIIB group elements except Aluminum, rare-earth elements, and IVB group elements. An intermediate layer is formed on the red fluorescent layer, being made of transparent resin, having a semicircular shape with a radius D; and a green fluorescent layer is formed on the intermediate layer, including a green phosphor, having a semicircular shape. A relationship between the radius r and the radius D is 2.0r(μm)≦D≦(r+1000)(μm).