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:
Mar. 26, 2013
Filed:
Oct. 13, 2010
Yasuhiko Iwanabe, Kodaira, JP;
Takuya Matsumoto, Hachioji, JP;
Junichiro Shimizu, Hadano, JP;
Harukazu Miyamoto, Higashimurayama, JP;
Yasuhiko Iwanabe, Kodaira, JP;
Takuya Matsumoto, Hachioji, JP;
Junichiro Shimizu, Hadano, JP;
Harukazu Miyamoto, Higashimurayama, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
Provided is a thermal-assisted-magnetic-recording head capable of directing, to a magnetic recording medium, light in which the spot size is reduced to submicron order with high total optical propagation efficiency. A light coupling unit that guides light emitted from the light source into a magnetic head and a high-refractive-index core that couples with the light guided by the light coupling unit to lead the light to an air bearing surface are arranged in the magnetic head. The light coupling unit includes a plurality of thin-film-like cores that are separated from each other by a clad material. An upper part of the high-refractive-index core is placed between two thin-film-like cores.