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Title:
MAGNETIC SHEET, AND ANTENNA DEVICE AND ELECTRONIC INFORMATION TRANSMISSION APPARATUS USING THE MAGNETIC SHEET
Document Type and Number:
Japanese Patent JP2008021991
Kind Code:
A
Abstract:

To provide a magnetic sheet which can be produced simply and efficiently using a soft magnetic powder and which is capable of decreasing influences of communication-interrupting members such as metals present nearby to entail wireless communication characteristics to be improved at a specified frequency.

The magnetic sheet can be produced by applying a magnetic paint and drying the applied paint. The magnetic sheet contains a soft magnetic powder of 30 to 80 volume percent and a binding material of 20 to 70 volume percent with a storage elastic modulus (E') at 20 to 60C of 109 Pa or higher (JIS K 7244-1). The binding material is elastomer or resin having a number average molecular weight Mn1.5104, and also having a storage elastic modulus (E') of 107 Pa or higher (JIS K 7244-1) at 20 to 60C.


Inventors:
Yoshihara, Ryota
Sato, Shinichi
Yoshida, Takahiko
Application Number:
JP2007000160570
Publication Date:
January 31, 2008
Filing Date:
June 18, 2007
Export Citation:
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Assignee:
NITTA IND CORP
International Classes:
H01F1/44; B32B27/18; H01F1/37; H01Q7/06; H01Q17/00; H05K9/00
Domestic Patent References:
JP2005015639A
JP2006045330A
Foreign References:
WO2006059771A1
Attorney, Agent or Firm:
深井 敏和