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. 20, 2009
Filed:
Apr. 21, 2006
Takehito Yoshida, Kawasaki, JP;
Yuka Yamada, Kawasaki, JP;
Nobuyasu Suzuki, Kawasaki, JP;
Toshiharu Makino, Kawasaki, JP;
Takehito Yoshida, Kawasaki, JP;
Yuka Yamada, Kawasaki, JP;
Nobuyasu Suzuki, Kawasaki, JP;
Toshiharu Makino, Kawasaki, JP;
Panasonic Corporation, Osaka, JP;
Abstract
In fabricating a monochromic and highly coherent light source, no single crystalline bulk semiconductor is used, but two different kinds of transparent substances are alternately stacked over each other to constitute a periodic structure in ½ of the intended wavelength. At least one of the two kinds of transparent substances is controllable in electric conductivity, and the structure is such that inside a medium consisting of this kind of transparent substance light-emitting semiconductor particulates are embedded. Accordingly, a light-emitting device has this structure, which makes possible control of the center wavelength of light emission, the width of wavelength distribution and coherence by adjusting the geometrical parameters of the device without having to alter the kind of material use.