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:
Jul. 03, 2012
Filed:
Jun. 11, 2009
Seiichi Takayama, Tokyo, JP;
Satoshi Tomikawa, Tokyo, JP;
Toshiyuki Ayukawa, Tokyo, JP;
Daisuke Miyauchi, Tokyo, JP;
Koji Shimazawa, Tokyo, JP;
Seiichi Takayama, Tokyo, JP;
Satoshi Tomikawa, Tokyo, JP;
Toshiyuki Ayukawa, Tokyo, JP;
Daisuke Miyauchi, Tokyo, JP;
Koji Shimazawa, Tokyo, JP;
TDK Corporation, Tokyo, JP;
Abstract
A waveguide is provided, in which the optical coupling efficiency to a light source is sufficiently high, and the light-emitting spot center is stably provided at the intended position. The waveguide comprises a multilayered structure in which refractive indexes of layers having a surface contact with each other are different from each other. The multilayered structure is divided into a plurality of groups, and the length from the light-receiving end surface to the light-emitting end surface of one group is different from that of the neighboring group, and the protruded light-emitting end surface of the first group defined as a group that has the largest length includes a center of the light-emitting spot. In this waveguide, the state in which the light-emitting spot center is positioned within the light-emitting end surface does not easily be changed, even when the light-receiving spot center within the light-receiving end surface is rather displaced.