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1. (WO2005069316) ANTENNA COIL AND TRANSPONDER
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/2005/069316    International Application No.:    PCT/JP2005/000380
Publication Date: 28.07.2005 International Filing Date: 14.01.2005
IPC:
H01F 1/34 (2006.01), H01F 1/37 (2006.01), H01Q 7/08 (2006.01)
Applicants: TDK CORPORATION [JP/JP]; 13-1, Nihonbashi 1-chome Chuo-ku, Tokyo 1038272 (JP) (For All Designated States Except US).
BABA, Fumitaka [JP/JP]; (JP) (For US Only).
MURASE, Taku [JP/JP]; (JP) (For US Only).
SAKANO, Shinichi [JP/JP]; (JP) (For US Only).
NAKANO, Manabu [JP/JP]; (JP) (For US Only)
Inventors: BABA, Fumitaka; (JP).
MURASE, Taku; (JP).
SAKANO, Shinichi; (JP).
NAKANO, Manabu; (JP)
Agent: OBA, Mitsuru; OBA & ASSOCIATES, 8F, KM Building 4-3, Iwamotocho 1-chome Chiyoda-ku, Tokyo 1010032 (JP)
Priority Data:
2004-009084 16.01.2004 JP
2004-344869 29.11.2004 JP
Title (EN) ANTENNA COIL AND TRANSPONDER
(FR) BOBINE D'ANTENNE ET TRANSPONDEUR
(JA) アンテナコイル、トランスポンダ
Abstract: front page image
(EN)An antenna coil, etc. for vehicle use that can cope with miniaturization. There is provided antenna coil (10) comprising magnetic core member (1) and conductor (2) wound round the magnetic core member (1), wherein the magnetic core member (1) is constituted of a sintered ferrite comprising 54.1 to 57.5 mol% of Fe2O3, the balance substantially composed mainly of MnO and containing as accessory ingredients 60 to 800 ppm, in terms of SiO2, of Si, 600 to 4000 ppm, in terms of CaCO3, of Ca and 1500 to 4000 ppm of Co3O4. The sintered ferrite can further contain Zn. This antenna coil (10) enables enhancing of inductance as compared with that of conventional Ni antenna coils and enables reducing of the number of turns of the conductor (2), thereby realizing miniaturization of the antenna coil (10).
(FR)L'invention concerne une bobine d'antenne, etc., destinée à un véhicule, pouvant être miniaturisée. L'invention concerne plus précisément une bobine d'antenne (10) comprenant un noyau magnétique (1) et un élément conducteur (2) enroulé autour du noyau magnétique (1). Le noyau magnétique (1) est constitué d'une ferrite frittée comprenant 54,1 à 57,5 mol % de Fe2O3, la balance étant composée principalement de MnO et de 60 à 800 ppm d'ingrédients accessoires, en termes de SiO2, de Si, de 600 à 4000 ppm, en termes de CaCO3, de Ca et de 1500 à 4000 ppm de Co3O4. La ferrite frittée peut également contenir du Zn. Cette bobine d'antenne (10) permet d'améliorer l'inductance par rapport à celle de bobines d'antennes de Ni classiques et permet de réduire le nombre de tours de l'élément conducteur (2), et, ainsi, de miniaturiser la bobine d'antenne (10).
(JA) 小型化に対応可能な車載用アンテナコイル等を提供する。  磁芯部材1と、磁芯部材1に巻回された導体2とを含むアンテナコイル10において、磁芯部材1をFe23:54.1~57.5mol%、残部実質的にMnOを主成分とし、副成分としてSiをSiO2換算で60~800ppm、CaをCaCO3換算で600~4000ppm、かつCo34を1500~4000ppm含有するフェライト焼結体で構成するようにした。フェライト焼結体中にさらにZnを含有することもできる。このようなアンテナコイル10とすることで、従来のNi系アンテナコイルと比べてインダクタンスを高くし、導体2の巻数を少なくして、アンテナコイル10の小型化を図る。
Designated States: AE, AG, AL, AM, AT, AU, AZ, BA, BB, BG, BR, BW, BY, BZ, CA, CH, CN, CO, CR, CU, CZ, DE, DK, DM, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, HR, HU, ID, IL, IN, IS, KE, KG, KP, KR, KZ, LC, LK, LR, LS, LT, LU, LV, MA, MD, MG, MK, MN, MW, MX, MZ, NA, NI, NO, NZ, OM, PG, PH, PL, PT, RO, RU, SC, SD, SE, SG, SK, SL, SM, SY, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, YU, ZA, ZM, ZW.
African Regional Intellectual Property Organization (BW, GH, GM, KE, LS, MW, MZ, NA, SD, SL, SZ, TZ, UG, ZM, ZW)
Eurasian Patent Organization (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM)
European Patent Office (AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HU, IE, IS, IT, LT, LU, MC, NL, PL, PT, RO, SE, SI, SK, TR)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, ML, MR, NE, SN, TD, TG).
Publication Language: Japanese (JA)
Filing Language: Japanese (JA)