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. 31, 2005
Filed:
Jun. 25, 2002
Shunji Yoshitake, Kawasaki, JP;
Hideki Sekiguchi, Yokohama, JP;
Atsuko Yamashita, Yokosuka, JP;
Kazuhiro Takimoto, Toyoura-gun, JP;
Koichi Takahashi, Yokohama, JP;
Shunji Yoshitake, Kawasaki, JP;
Hideki Sekiguchi, Yokohama, JP;
Atsuko Yamashita, Yokosuka, JP;
Kazuhiro Takimoto, Toyoura-gun, JP;
Koichi Takahashi, Yokohama, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
A semiconductor light emitting device is disclosed in which a semiconductor multilayer structure including a light emitting layer is formed on a substrate and light is output from the opposite surface of the semiconductor multilayer structure from the substrate. The light output surface is formed with a large number of protrusions in the form of cones or pyramids. To increase the light output efficiency, the angle between the side of each protrusion and the light output surface is set to between 30 and 70 degrees.