Wireless communication device for periodically controlling a carrier wave to establish a good communication state with a communication object
First Claim
Patent Images
1. A wireless communication device comprising:
- an antenna configured to carry out a wireless communication with a communication object;
a carrier wave transmitting unit configured to transmit via the antenna a carrier wave to the communication object located in a communication ready area from the antenna as a base point, the carrier wave having a level exceeding a threshold level that can render the communication object to generate electric power for the communication;
a carrier wave control unit configured to periodically set the level of the carrier wave transmitted from the carrier wave transmitting unit temporarily lower than the threshold level; and
a signal receiving unit configured to receive via the antenna a response signal transmitted in reply to the carrier wave from the communication object in the communication ready area,wherein the carrier wave control unit temporarily sets the carrier wave to a level lower than the threshold level when the signal receiving unit does not receive the response signal within a certain period of time after the carrier wave transmitting unit transmits the carrier wave.
1 Assignment
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Accused Products
Abstract
A reader/writer of a wireless communication device transmits a carrier signal from an antenna, and if there is not response from an IC card within a preset time after transmitting the polling command, the carrier signal is temporarily controlled to an OFF state.
26 Citations
8 Claims
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1. A wireless communication device comprising:
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an antenna configured to carry out a wireless communication with a communication object; a carrier wave transmitting unit configured to transmit via the antenna a carrier wave to the communication object located in a communication ready area from the antenna as a base point, the carrier wave having a level exceeding a threshold level that can render the communication object to generate electric power for the communication; a carrier wave control unit configured to periodically set the level of the carrier wave transmitted from the carrier wave transmitting unit temporarily lower than the threshold level; and a signal receiving unit configured to receive via the antenna a response signal transmitted in reply to the carrier wave from the communication object in the communication ready area, wherein the carrier wave control unit temporarily sets the carrier wave to a level lower than the threshold level when the signal receiving unit does not receive the response signal within a certain period of time after the carrier wave transmitting unit transmits the carrier wave.
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2. A wireless communication device comprising:
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an antenna configured to carry out a wireless communication with a communication object; a carrier wave transmitting unit configured to transmit via the antenna a carrier wave to the communication object located in a communication ready area from the antenna as a base point, the carrier wave having a level exceeding a threshold level that can render the communication object to generate electric power for the communication; a carrier wave control unit configured to periodically set the level of the carrier wave transmitted from the carrier wave transmitting unit temporarily lower than the threshold level; and a command transmitting unit configured to transmit command data to the communication object, wherein the carrier wave control unit temporarily sets the carrier wave to a level lower than the threshold level each time a polling command is transmitted from the command transmitting unit.
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3. A wireless communication device comprising:
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an antenna configured to carry out a wireless communication with a communication object; a carrier wave transmitting unit configured to transmit via the antenna a carrier wave to the communication object located in a communication ready area from the antenna as a base point, the carrier wave having a level exceeding a threshold level that can render the communication object to generate electric power for the communication; a carrier wave control unit configured to periodically set the level of the carrier wave transmitted from the carrier wave transmitting unit temporarily lower than the threshold level; a command transmitting unit configured to transmit command data to the communication object while carrying the command data on the carrier wave; and a signal receiving unit configured to receive via the antenna a response signal transmitted in reply to the carrier wave from the communication object in the communication ready area, wherein the carrier wave control unit temporarily sets the carrier wave to a level lower than the threshold level when the signal receiving unit does not receive the response signal within a certain period of time after the command transmitting unit transmits the polling command carried on the carrier wave.
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4. A wireless communication device comprising:
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an antenna configured to carry out a wireless communication with a communication object; a carrier wave transmitting unit configured to transmit via the antenna a carrier wave to the communication object located in a communication ready area from the antenna as a base point, the carrier wave having a level exceeding a threshold level that can render the communication object to generate electric power for the communication; a carrier wave control unit configured to periodically set the level of the carrier wave transmitted from the carrier wave transmitting unit temporarily lower than the threshold level; at least one antenna identical to the antenna; and a switching unit configured to switch over between the plurality of antennas; wherein the carrier wave control unit periodically sets the carrier wave transmitted from the carrier wave transmitting unit temporarily to a level lower than the threshold level via the antenna switched over by the switching unit. - View Dependent Claims (5, 6, 7, 8)
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Specification