Antenna, and radio timepiece using the same, keyless entry system, and rf id system
AssigneeHitachi Metals, Ltd.
InventorsHirokazu Araki, Masahiro Mita, Chiharu Mitsumata
Life of this patent
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Abstract
A magnetic sensor-type antenna comprising a magnetic core and a coil wound around the magnetic core for receiving electromagnetic waves, which is disposed in a housing such that the end portion of the magnetic core is bent away from the housing or a metal portion of the housing, and a timepiece, a keyless entry system and an RFID system each comprising such an antenna.
Claims36
1-32. (canceled)
A magnetic sensor-type antenna, comprising:
- a magnetic core and a coil wound around the magnetic core for receiving a radio wave, the antenna being disposed in a housing, and end portions of the magnetic core being bent in a direction away from the housing or a metal part of the housing.
A magnetic sensor-type antenna, comprising:
- a magnetic main path member comprising a coil wound around a magnetic core for receiving a magnetic field component of an electromagnetic wave, the antenna further comprising a magnetic sub-path member having a gap mounted to part of the magnetic core, the magnetic core being including a single thin ribbon or laminated thin ribbons.
A magnetic sensor-type antenna, comprising:
- a magnetic main path member comprising a coil wound around a magnetic core for receiving a magnetic field component of an electromagnetic wave, the antenna further comprising a magnetic sub-path member having a gap mounted to part of the magnetic core, the magnetic core including a ferrite plate.
A magnetic sensor-type antenna for receiving a radio wave, the antenna comprising:
- a magnetic main path member further comprising a magnetic core and a coil wound around the magnetic core;
- and
- a pair of magnetic sub-path members attached to the magnetic core, the magnetic sub-path member being made of a material having a smaller specific permeability than that of the magnetic core.
A magnetic sensor-type antenna for receiving a radio wave, the antenna comprising:
- a magnetic main path member further comprising a magnetic core and a coil wound around the magnetic core;
- and
- a magnetic sub-path member attached to the magnetic core,
- the magnetic sub-path member being including a first magnetic sub-path member, and a second magnetic sub-path member sandwiched by the first magnetic sub-path member and the magnetic core without an air gap, and
- the second magnetic sub-path member having a smaller specific permeability than that of the first magnetic sub-path member.
A magnetic sensor-type antenna, comprising:
- a magnetic core and a coil wound around the magnetic core for receiving a radio wave, wherein the antenna comprises a case in which the magnetic core and the coil are disposed, and further wherein the case has a specific permeability of 2 or more, smaller than that of the magnetic core.
Dependencies are inferred from the claim text.