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:
Oct. 16, 2007
Filed:
Aug. 09, 2004
Mun Cheol Paek, Daejeon-Shi, KR;
Yeung Joon Sohn, Daejeon-Shi, KR;
Dong Woo Suh, Daejeon-Shi, KR;
Ho Jun Ryu, Seoul, KR;
Hyeon Bong Pyo, Daejeon-Shi, KR;
Yong Woo Park, Daejeon-Shi, KR;
Mun Cheol Paek, Daejeon-Shi, KR;
Yeung Joon Sohn, Daejeon-Shi, KR;
Dong Woo Suh, Daejeon-Shi, KR;
Ho Jun Ryu, Seoul, KR;
Hyeon Bong Pyo, Daejeon-Shi, KR;
Yong Woo Park, Daejeon-Shi, KR;
Electronics and Telecommunications Research Institute, Daejon-shi, KR;
Abstract
Provided is a planar focusing grating coupler, comprising: a light waveguide including a cladding layer and a core layer formed on a substrate and maintaining incident laser light in a single mode; and a focusing grating coupler formed to have a predetermined grating pitch at a certain area over the core layer, wherein the light using to the light waveguide forms a focal point with the grating layer in the direction perpendicular to the focusing grating coupler, whereby an ultra small pickup head for a mobile optical disk can be used.