Title:
EARPHONE ANTENNA AND RADIO DEVICE WITH SAME
Document Type and Number:
WIPO Patent Application WO/2004/080112
Kind Code:
A2
Abstract:
An earphone antenna wherein two pairs of audio/high-frequency signal lines corresponding to left and right earphone units connected to a balance-unbalance transformer are provided, the terminals of the audio/high-frequency signal lines on the opposite side to the balance-unbalance transformer are connected to the earphone units through loading coils, and further the terminals on the opposite side to the balance-unbalance transformer are interconnected through a pair of conductors with sound cut off means inserted. With this structure, the high-frequency adverse effect on a radio device from the human body through the earphone of the earphone antenna can be eliminated.
Inventors:
YOSHINO YOSHITAKA (JP)
OOZEKI MINORU (JP)
IMAGAWA TOSHIYUKI (JP)
OOZEKI MINORU (JP)
IMAGAWA TOSHIYUKI (JP)
Application Number:
PCT/JP2004/001484
Publication Date:
September 16, 2004
Filing Date:
February 12, 2004
Export Citation:
Assignee:
SONY CORP (JP)
YOSHINO YOSHITAKA (JP)
OOZEKI MINORU (JP)
IMAGAWA TOSHIYUKI (JP)
YOSHINO YOSHITAKA (JP)
OOZEKI MINORU (JP)
IMAGAWA TOSHIYUKI (JP)
International Classes:
H01Q1/22; H04R1/10; H01Q1/24; H01Q1/46; H01Q7/00; H01Q9/26; H01Q9/44; H04B1/18; H04R5/033; (IPC1-7): H04R/
Foreign References:
| JP2002017426A | 2002-01-22 | |||
| JPS582079U | 1983-01-07 | |||
| JPH1056325A | 1998-02-24 |
Attorney, Agent or Firm:
Nakamura, Tomoyuki c/o Miyoshi International Patent Office (Toranomon Kotohira Tower 2-8, Toranomon 1-chom, Minato-ku Tokyo, JP)
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