Title:
MAGNETIC SHEET, ANTENNA DEVICE, AND METHOD FOR MANUFACTURING ANTENNA DEVICE
Document Type and Number:
WIPO Patent Application WO/2008/018211
Kind Code:
A1
Abstract:
This invention provides an antenna device that can realize high rigidity while
using a fragile ferrite sinter and can realize excellent communication properties.
In this antenna device, an antenna module comprises a magnetic core member (20)
comprising a plurality of flat-shaped ferrite sinters (21) spread so as to cover
an antenna coil mounted on an antenna substrate. The ferrite sinter (21) has
a size satisfying requirements of 2 < D/A, 0 < L1 < 5 Π21/2,
and 1 ≤ L1/L2 ≤ 2 wherein D represents the thickness of the ferrite
sinter (21), µm; A represents the area of a main plane, mm2; L1
represents the length of major axis, mm; and L2 represents the length of minor
axis, mm.
Inventors:
ARAMAKI KEISUKE (JP)
SUGITA SATORU (JP)
IKEDA YOSHITO (JP)
NAKAZAWA TAKESHI (JP)
SUGITA SATORU (JP)
IKEDA YOSHITO (JP)
NAKAZAWA TAKESHI (JP)
Application Number:
PCT/JP2007/058232
Publication Date:
February 14, 2008
Filing Date:
April 16, 2007
Export Citation:
Assignee:
SONY CHEM & INF DEVICE CORP (JP)
ARAMAKI KEISUKE (JP)
SUGITA SATORU (JP)
IKEDA YOSHITO (JP)
NAKAZAWA TAKESHI (JP)
ARAMAKI KEISUKE (JP)
SUGITA SATORU (JP)
IKEDA YOSHITO (JP)
NAKAZAWA TAKESHI (JP)
International Classes:
H01Q7/06; G06K19/00; G06K19/02; H01Q7/00
Foreign References:
| JP2006174223A | 2006-06-29 | |||
| JP2006164083A | 2006-06-22 | |||
| JP2005269599A | 2005-09-29 | |||
| JP2005340759A | 2005-12-08 | |||
| JP2005080023A | 2005-03-24 | |||
| JPH0746164A | 1995-02-14 | |||
| JP2006041985A | 2006-02-09 | |||
| JP2002290131A | 2002-10-04 | |||
| JP2006173443A | 2006-06-29 |
Attorney, Agent or Firm:
SATO, Masaru (3-1 Ariak, Kouto-ku Tokyo 71, JP)
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