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Patent Searching and Data


Title:
ANTENNA DEVICE AND COMMUNICATION DEVICE
Document Type and Number:
WIPO Patent Application WO/2011/013662
Kind Code:
A1
Abstract:
Disclosed is an antenna device which is capable of stably communicating, even if the temperature changes, by maintaining a substantially constant resonance frequency. The disclosed device is provided with: an antenna coil (11a) for receiving a magnetic field transmitted from a reader/writer (2); an antenna circuit (11), comprising a capacitor (11b); and a magnetic sheet (12), which changes the inductance of the antenna coil (11a) and is formed in a position superimposed upon the antenna coil (11a). The capacitor (11b) has thermal characteristics whereby capacity changes according to changes in temperature. The magnetic sheet (12) is formed from magnetic material having thermal characteristics such that the resonance frequency of the antenna circuit (11), in the operating temperature range, is made to match substantially the oscillation frequency of the reader/writer (2) and the inductance of the antenna coil (11a) is changed by an inverse characteristic to that changing the capacity of the capacitor (11b) according to temperature changes within the operating temperature range.

Inventors:
ORIHARA, Katsuhisa (Gate City Osaki East Tower 8F, 1-11-2, Osaki, Shinagawa-k, Tokyo 32, 〒1410032, JP)
折原 勝久 (〒32 東京都品川区大崎1丁目11番2号 ゲートシティ大崎イーストタワー8階 ソニーケミカル&インフォメーションデバイス株式会社内 Tokyo, 〒1410032, JP)
SUGITA, Satoru (Gate City Osaki East Tower 8F, 1-11-2, Osaki, Shinagawa-k, Tokyo 32, 〒1410032, JP)
杉田 悟 (〒32 東京都品川区大崎1丁目11番2号 ゲートシティ大崎イーストタワー8階 ソニーケミカル&インフォメーションデバイス株式会社内 Tokyo, 〒1410032, JP)
Application Number:
JP2010/062618
Publication Date:
February 03, 2011
Filing Date:
July 27, 2010
Export Citation:
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Assignee:
SONY CHEMICAL & INFORMATION DEVICE CORPORATION (Gate City Osaki, East Tower 8F 1-11-2, Osaki, Shinagawa-k, Tokyo 32, 〒1410032, JP)
ソニーケミカル&インフォメーションデバイス株式会社 (〒32 東京都品川区大崎1丁目11番2号 ゲートシティ大崎イーストタワー8階 Tokyo, 〒1410032, JP)
ORIHARA, Katsuhisa (Gate City Osaki East Tower 8F, 1-11-2, Osaki, Shinagawa-k, Tokyo 32, 〒1410032, JP)
折原 勝久 (〒32 東京都品川区大崎1丁目11番2号 ゲートシティ大崎イーストタワー8階 ソニーケミカル&インフォメーションデバイス株式会社内 Tokyo, 〒1410032, JP)
SUGITA, Satoru (Gate City Osaki East Tower 8F, 1-11-2, Osaki, Shinagawa-k, Tokyo 32, 〒1410032, JP)
International Classes:
H01Q7/06; G06K19/07; G06K19/077; H01F27/00
Attorney, Agent or Firm:
KOIKE, Akira et al. (32F St. Luke's Tower, 8-1 Akashi-cho, Chuo-k, Tokyo 44, 〒1040044, JP)
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