An antenna includes a rod-like core configured by an amorphous metal formed into a bulk configuration, and a coil wound around the core. An electronic device includes a case encasing the antenna, a sectional area of each longitudinal end portion of the core being larger than that of a central portio
An antenna includes a rod-like core configured by an amorphous metal formed into a bulk configuration, and a coil wound around the core. An electronic device includes a case encasing the antenna, a sectional area of each longitudinal end portion of the core being larger than that of a central portion of the core. The antenna may be disposed under a radio wave permeable decorative plate in such a manner that a magnetic sheet is attached to each end portion of the core to protrude outwards from the core or that an expanded portion is disposed in each end portion and has such a shape to make a side of a surface of the expanded portion facing the decorative plate receive more radio wave than a side of a surface of the expanded portion opposite to the facing surface in relation to an axial line of the antenna.
대표청구항▼
What is claimed is: 1. An antenna comprising: a rod-like core comprising an amorphous metal having a bulk configuration, the core having a longitudinal central portion and longitudinal end portions; an expanded portion, which receives a radio wave, at each of the longitudinal end portions of the co
What is claimed is: 1. An antenna comprising: a rod-like core comprising an amorphous metal having a bulk configuration, the core having a longitudinal central portion and longitudinal end portions; an expanded portion, which receives a radio wave, at each of the longitudinal end portions of the core; a coil wound around the longitudinal central portion of the core; and a decorative plate which is permeable to the radio waves; wherein the core is disposed under the decorative plate, and each said expanded portion has a shape such that, when the radio wave is received, a received radio wave amount on a surface at a first side of the expanded portion facing the decorative plate is larger than a received radio wave amount on a surface at a second side of the expanded portion that is opposite to the first side with respect to an axial line of the central portion of the core. 2. The antenna according to claim 1, wherein each expanded portion bends from a respective one of the end portions of the core toward the decorative plate. 3. The antenna according to claim 1, wherein, at each said expanded portion, an area of the surface on the first side of the expanded portion is larger than a sectional area of the central portion of the core. 4. The antenna according to claim 1, wherein, at each said expanded portion, a radio wave receiving area on the surface on the first side of the expanded portion is larger than a radio wave receiving area on the surface on the second side of the expanded portion. 5. The antenna according to claim 1, wherein each expanded portion bends from a respective one of the end portions of the core toward the decorative plate, and a diameter of each said expanded portion gradually decreases toward the central portion of the core, and becomes substantially constant in the central portion of the core. 6. An electronic device comprising: a case which has an opening in an upper portion thereof and which is impermeable to a radio wave; a decorative plate which is disposed in the opening of the case and which is permeable to the radio wave; and an antenna comprising: (i) a rod-like core which comprises an amorphous metal having a bulk configuration, and which has a longitudinal central portion and longitudinal end portions, (ii) an expanded portion, which receives a radio wave, at each of the longitudinal end portions of the core, and (iii) a coil wound around the longitudinal central portion of the core; wherein the antenna is disposed under the decorative plate, and each said expanded portion has a shape such that, when the radio wave is received, a received radio wave amount on a surface at a first side of the expanded portion facing the decorative plate is larger than a received radio wave amount on a surface at a second side of the expanded portion that is opposite to the first side with respect to an axial line of the antenna. 7. An electronic device comprising: a case which has an opening in an upper portion thereof and which is impermeable to a radio wave; a decorative plate which is disposed in the opening of the case and which is permeable to the radio wave; and an antenna comprising: (i) a rod-like core which comprises an amorphous metal having a bulk configuration, and which has a longitudinal central portion and longitudinal end portions, (ii) an expanded portion at each of the longitudinal end portions of the core, and (iii) a coil wound around the longitudinal central portion of the core; wherein the antenna is disposed under the decorative plate, and a magnetic layer formed on a lower surface of the decorative plate is magnetically connected to each of the expanded portions. 8. The electronic device according to claim 7, wherein the magnetic layer comprises a magnetic sheet attached to the lower surface of the decorative plate. 9. The electronic device according to claim 8, wherein the magnetic sheet comprises an amorphous metal.
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이 특허에 인용된 특허 (6)
Sano,Takashi, Antenna and method for manufacturing the same.
Minami,Narutoshi; Sano,Takashi; Kimura,Soh; Araki,Hirokazu; Mita,Masahiro; Kotani,Tadashi; Ishimoto,Takayuki, Antenna, watch provided with the antenna, and method of manufacturing the antenna.
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