Communication system
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Accused Products
Abstract
The present invention enhances the degree of freedom in communication using a quasi-electrostatic field. According to the present invention, on the card device 3 (a ticket checking and collecting machine 2) side in a communication system 1, a quasi-electrostatic field according to an identification signal S5 (a notification signal S9) modulated according to identification information S4 (notification information S8) is generated from an internal electrode 8 (a side-surface electrode 7) to electrify a human body. At the ticket checking and collecting machine 2 (the card device 3), displacement of the strength of a information-transmission quasi-electrostatic field DTD which is isotropically formed in the neighborhood of the human body is detected via the side-surface electrode 7 (the internal electrode 8) and a FET 28 (a FET 37) sequentially, and based on the detection result, the identification information S4 (the notification information S8) is demodulated. Thereby, it is possible to realize sending and receiving of information without directional restrictions in the neighborhood of the human body, with confidentiality secured and without forcing the human body to perform a predetermined movement. Thus, the degree of freedom in communication can be enhanced.
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Citations
66 Claims
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1-29. -29. (canceled)
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30. A communication system comprising:
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a first communication device for electrifying an electrification target having electrification properties by generating a quasi-electrostatic field modulated according to information to be sent; and
a second communication device for detecting change in electrification condition of the electrification target and demodulating the information based on the change. - View Dependent Claims (31, 32, 33)
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34. A communication device comprising:
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an electric field generation electrode for generating an electric field; and
modulation means for performing modulation according to information to be sent so that an electrification target is electrified by a quasi-electrostatic field out of the electric field generated from the electric field generation electrode, and outputting a modulated signal resulted from the modulation, to the electric field generation electrode. - View Dependent Claims (35, 36, 37, 38, 39, 40, 41, 42, 43, 44)
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45. A communication device comprising:
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detection means for detecting an electrification condition of an electrification target electrified by a quasi-electrostatic field out of an electric field based on a modulated signal obtained through modulation according to information to be sent; and
demodulation means for modulating the information based on change in the electrification condition detected by the detection means. - View Dependent Claims (46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64)
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65. An electrode manufacturing method of an electrode to be used in communicating a quasi-electrostatic field as an information communication medium, wherein
a first step of selecting an originating frequency and a communication band for communication, a distance between electrodes and an electrode area of a sender parallel plane electrode to be used as a sender electrode, and a distance between electrodes of a receiver parallel plane electrode to be used as a receiver electrode; -
a second step of determining a communication limit position between the sender parallel plane electrode and the receiver parallel plane electrode based on a matter selected in the first step; and
a third step of determining whether potential exists where a strength induction field component of an electric field at the communication limit position determined in the second step is below a noise floor specified according to the communication band, when potential of the originating frequency is supplied to the sender parallel plane electrode. - View Dependent Claims (66)
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Specification