Transponder, interrogator and system thereof
First Claim
1. A transponder for tire having information storage means for gaining access to information within said information storage means at received a predetermined question signal, and for transmitting an answering signal, comprising:
- a main circuit including;
first receiving means for receiving an electromagnetic wave of a predetermined first frequency;
first energy converting means for converting energy of the electromagnetic wave received by said first receiving means into electric energy;
a central processing unit for operating by means of electric energy to be outputted from said first energy converting means and for reading, on receipt of said question signal by said first receiving means, storage information of said information storage means in response to the content of said question signal to generate an electric signal representing answering information for outputting; and
transmission means for operating by means of electric energy to be outputted from said first energy converting means and for transmitting an answering signal on the basis of an electric signal representing said answering information outputted from said central processing unit;
second receiving means for receiving an electromagnetic wave of a second frequency that is lower than said first frequency;
second energy converting means for converting energy of an electromagnetic wave received by said second receiving means into electric energy;
a capacitor for accumulating electric energy to be outputted from said second energy converting means; and
an additional circuit, in which the electric power consumption of which is larger than that of said main circuit, wherein as a main power source or an auxiliary power source for operating said additional circuit, electric energy accumulated in said capacitor is used.
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Accused Products
Abstract
A data transmission-reception unit which operates by means of energy of a received electromagnetic wave and serves as a main circuit, is provided with a sensor circuit as an additional circuit, and a transponder having a sensor power circuit for supplying electric power only to the sensor circuit is constituted. From a sensor charging circuit of an interrogator, an electromagnetic wave of a lower frequency different from a frequency of electromagnetic wave for data communication is radiated, or loop coil-shaped charging antennas are electromagnetic-coupled to thereby charge a capacitor for the sensor power circuit. Thereby, a secondary battery and the capacitor such as a large scale capacitor can be easily charged from an outside, and further, a power consumption for the capacitor can be restrained.
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Citations
26 Claims
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1. A transponder for tire having information storage means for gaining access to information within said information storage means at received a predetermined question signal, and for transmitting an answering signal, comprising:
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a main circuit including;
first receiving means for receiving an electromagnetic wave of a predetermined first frequency;
first energy converting means for converting energy of the electromagnetic wave received by said first receiving means into electric energy;
a central processing unit for operating by means of electric energy to be outputted from said first energy converting means and for reading, on receipt of said question signal by said first receiving means, storage information of said information storage means in response to the content of said question signal to generate an electric signal representing answering information for outputting; and
transmission means for operating by means of electric energy to be outputted from said first energy converting means and for transmitting an answering signal on the basis of an electric signal representing said answering information outputted from said central processing unit;
second receiving means for receiving an electromagnetic wave of a second frequency that is lower than said first frequency;
second energy converting means for converting energy of an electromagnetic wave received by said second receiving means into electric energy;
a capacitor for accumulating electric energy to be outputted from said second energy converting means; and
an additional circuit, in which the electric power consumption of which is larger than that of said main circuit, wherein as a main power source or an auxiliary power source for operating said additional circuit, electric energy accumulated in said capacitor is used. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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14. An interrogator for transmitting a question signal to a transponder and receiving an answering signal transmitted from said transponder, comprising:
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question signal transmission means for transmitting a question signal to said transponder through an electromagnetic wave of a first frequency;
receiving means for receiving an answering signal transmitted from said transponder correspondingly to said question signal; and
energy supplying means for transmitting an electromagnetic wave of a second frequency different from said first frequency in order to supply electric energy to said transponder.
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Specification