Radio communication system, antenna device and sheet processing device
First Claim
Patent Images
1. A radio communication system including:
- an antenna device which generates a magnetic field to a radio communication medium conveyed through a conveyance path, the magnetic field passing through the radio communication medium; and
a main unit which transmits and receives signals via the antenna device to and from the radio communication medium conveyed through the conveyance path, thereby performing communication with the radio communication medium, and wherein the antenna device comprises a plurality of transmission lines provided parallel to each other along the conveyance path, and a signal circuit which divides, into a plurality of components, a signal from the main unit, shifts phases of the components from each other, and supplies the resultant components to the respective transmission lines.
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Abstract
A radio communication system includes an antenna device, and transmits and receives data by radio to and from a radio communication medium. The antenna includes two transmission lines provided along the conveyance path, and generates a magnetic field between the transmission lines perpendicularly with respect to the surface of the radio communication medium conveyed. Accordingly, when the radio communication medium is conveyed between the two transmission lines, it passes through a uniform magnetic field generated over a relatively long distance, over which the transmission lines run. As a result, stable communication can be established over the relatively long distance.
21 Citations
24 Claims
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1. A radio communication system including:
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an antenna device which generates a magnetic field to a radio communication medium conveyed through a conveyance path, the magnetic field passing through the radio communication medium; and
a main unit which transmits and receives signals via the antenna device to and from the radio communication medium conveyed through the conveyance path, thereby performing communication with the radio communication medium, and wherein the antenna device comprises a plurality of transmission lines provided parallel to each other along the conveyance path, and a signal circuit which divides, into a plurality of components, a signal from the main unit, shifts phases of the components from each other, and supplies the resultant components to the respective transmission lines. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An antenna device for a radio communication system which performs radio communication by transmitting and receiving signals to and from a radio communication medium conveyed through a conveyance path, comprising:
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a plurality of transmission lines provided parallel to each other along the conveyance path; and
a signal circuit which divides, into a plurality of components, a signal from the main unit, shifts phases of the components from each other, and supplies the resultant components to the respective transmission lines. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A sheet processing apparatus for conveying a sheet provided with a radio communication medium storing identification data, reading the identification data from the radio communication medium, and processing the sheet based on the read identification data, comprising:
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an antenna device which generates a magnetic field to a radio communication medium conveyed through a conveyance path, the magnetic field passing through the radio communication medium; and
a main unit which transmits and receives signals via the antenna device to and from the radio communication medium conveyed through the conveyance path, thereby performing communication with the radio communication medium, wherein the antenna device comprises a plurality of transmission lines provided parallel to each other along the conveyance path, and a signal circuit which divides, into a plurality of components, a signal from the main unit, shifts phases of the components from each other, and supplies the resultant components to the respective transmission lines. - View Dependent Claims (22, 23, 24)
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Specification