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:
Feb. 21, 2006
Filed:
Aug. 28, 2003
Hiraku Akiho, Miyagi, JP;
Yutaka Okazaki, Tokyo, JP;
Kazuo Goto, Kanagawa, JP;
Akihiro Kikuchi, Chiba, JP;
Hiraku Akiho, Miyagi, JP;
Yutaka Okazaki, Tokyo, JP;
Kazuo Goto, Kanagawa, JP;
Akihiro Kikuchi, Chiba, JP;
Sony Corporation, Tokyo, JP;
Abstract
An antenna apparatus () is provided which is used in a recorder and/or player to write and read data to and from a contactless IC card (). The antenna apparatus () includes a loop coil () to radiate an electromagnetic field for magnetic coupling with a loop coil () at the IC card () to send and receive data to and from the IC card (), and a magnetic sheet () disposed to face the main side of the loop coil (), opposite to the main side facing the IC card (). The magnetic sheet () has the specific permeability μ' and product Ms·t of saturation magnetization Ms and thickness t thereof set in accordance with a necessary range of communications with the contactless IC card ().