Contactless communication with authorization by human contact and visual indicator
First Claim
1. A transponder comprising:
- a resonant circuit that includes an antenna and a capacitor;
a memory;
a contact zone configured to be contacted by a portion of human body;
an enable/disable circuit configured to switch from a first state, in which the enable/disable circuit does not allow the memory to be accessed, to a second state in which the enable/disable circuit allows the memory to be accessed when the resonant circuit of the transponder is contactlessly powered by a reader; and
a first indicator configured to indicate that a portion of human body has contacted the contact zone of the transponder, wherein the enable/disable circuit is configured to switch from the first state to the second state in response to a portion of human body being placed on the contact zone and is configured to remain in the second state after the portion of human body is removed from the contact zone, the enable/disable circuit including;
a switch configured to selectively place the enable/disable circuit in the second state;
a capacitor configured to store an amount of charge that keeps the switch in a state that keeps the enable/disable circuit in the second state;
a charge circuit configured to charge the capacitor and place the switch in the state that keeps the enable/disable circuit in the second state in response to a portion of human body being placed on the contact zone; and
a flip-flop configured to place the enable/disable circuit in the second state, the flip-flop having an input, coupled to the switch, and an output;
wherein;
the charge circuit includes a first diode electrically coupled between the contact zone and the capacitor and a second diode electrically coupled between the output of the flip-flop and the capacitor, the first diode being configured to charge the capacitor in response to a portion of human body being placed on the contact zone and the second diode being configured to keep the capacitance capacitor charged based on an output value provided by the flip-flop.
1 Assignment
0 Petitions
Accused Products
Abstract
Transponder comprising a resonant circuit, comprising an antenna and a capacitor, and at least one memory, wherein it comprises at least one contact zone for receiving a portion of human body, so that the positioning of a portion of human body on a contact zone modifies the electric circuit of the transponder, capable of switching from a first state in which it does not allow the memory to be read and/or written to a second state in which it allows the memory to be read and/or written when the resonant circuit of the transponder is contactlessly powered by a reader and in that it comprises an indicator which makes it possible to indicate that the positioning of a portion of human body on the contact zone of the transponder is or has been recognized.
25 Citations
23 Claims
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1. A transponder comprising:
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a resonant circuit that includes an antenna and a capacitor; a memory; a contact zone configured to be contacted by a portion of human body; an enable/disable circuit configured to switch from a first state, in which the enable/disable circuit does not allow the memory to be accessed, to a second state in which the enable/disable circuit allows the memory to be accessed when the resonant circuit of the transponder is contactlessly powered by a reader; and a first indicator configured to indicate that a portion of human body has contacted the contact zone of the transponder, wherein the enable/disable circuit is configured to switch from the first state to the second state in response to a portion of human body being placed on the contact zone and is configured to remain in the second state after the portion of human body is removed from the contact zone, the enable/disable circuit including; a switch configured to selectively place the enable/disable circuit in the second state; a capacitor configured to store an amount of charge that keeps the switch in a state that keeps the enable/disable circuit in the second state; a charge circuit configured to charge the capacitor and place the switch in the state that keeps the enable/disable circuit in the second state in response to a portion of human body being placed on the contact zone; and a flip-flop configured to place the enable/disable circuit in the second state, the flip-flop having an input, coupled to the switch, and an output;
wherein;the charge circuit includes a first diode electrically coupled between the contact zone and the capacitor and a second diode electrically coupled between the output of the flip-flop and the capacitor, the first diode being configured to charge the capacitor in response to a portion of human body being placed on the contact zone and the second diode being configured to keep the capacitance capacitor charged based on an output value provided by the flip-flop. - View Dependent Claims (2, 3, 4, 6, 7, 8, 9, 10, 11)
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5. A transponder comprising:
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a resonant circuit that includes an antenna and a capacitor; a memory; a contact zone configured to be contacted by a portion of human body; an enable/disable circuit configured to switch from a first state, in which the enable/disable circuit does not allow the memory to be accessed, to a second state in which the enable/disable circuit allows the memory to be accessed when the resonant circuit of the transponder is contactlessly powered by a reader; a first indicator configured to indicate that a portion of human body has contacted the contact zone of the transponder, wherein the enable/disable circuit is configured to switch from the first state to the second state in response to a portion of human body being placed on the contact zone and is configured to remain in the second state after the portion of human body is removed from the contact zone; first and second supply terminals; a first switch coupled in series with the first indicator in a first branch between the supply terminals; first and second resistors coupled to each other in a second branch, parallel to the first branch, between the supply terminals, the resistors being coupled to each other by an intermediate node that is also coupled to a control terminal of the first switch; and a second switch coupled between the intermediate terminal and the second terminal of the transponder.
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12. A telephone, comprising:
a transponder that includes; a resonant circuit that includes an antenna and a capacitor; a memory; a contact zone configured to be contacted by a portion of human body; an enable/disable circuit configured to switch from a first state, in which the enable/disable circuit does not allow the memory to be accessed, to a second state in which the enable/disable circuit allows the memory to be accessed when the resonant circuit of the transponder is contactlessly powered by a reader; and an indicator configured to indicate that a portion of human body has contacted the contact zone of the transponder, wherein the enable/disable circuit is configured to switch from the first state to the second state in response to a portion of human body being placed on the contact zone and is configured to remain in the second state after the portion of human body is removed from the contact zone, the enable/disable circuit including; a switch configured to selectively place the enable/disable circuit in the second state; a capacitor configured to store an amount of charge that keeps the switch in a state that keeps the enable/disable circuit in the second state; a charge circuit configured to charge the capacitor and place the switch in the state that keeps the enable/disable circuit in the second state in response to a portion of human body being placed on the contact zone; and a flip-flop configured to place the enable/disable circuit in the second state, the flip-flop having an input, coupled to the switch, and an output;
wherein;the charge circuit includes a first diode electrically coupled between the contact zone and the capacitor and a second diode electrically coupled between the output of the flip-flop and the capacitor, the first diode being configured to charge the capacitor in response to a portion of human body being placed on the contact zone and the second diode being configured to keep the capacitor charged based on an output value provided by the flip-flop. - View Dependent Claims (13, 14)
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15. A telephone, comprising:
a transponder that includes; a resonant circuit that includes an antenna and a capacitor; a memory; a contact zone configured to be contacted by a portion of human body; an enable/disable circuit configured to switch from a first state, in which the enable/disable circuit does not allow the memory to be accessed, to a second state in which the enable/disable circuit allows the memory to be accessed when the resonant circuit of the transponder is contactlessly powered by a reader; an indicator configured to indicate that a portion of human body has contacted the contact zone of the transponder, wherein the enable/disable circuit is configured to switch from the first state to the second state in response to a portion of human body being placed on the contact zone and is configured to remain in the second state after the portion of human body is removed from the contact zone; first and second supply terminals; a first switch coupled in series with the indicator in a first branch between the supply terminals; first and second resistors coupled to each other in a second branch, parallel to the first branch, between the supply terminals, the resistors being coupled to each other by an intermediate node that is also coupled to a control terminal of the first switch; and a second switch coupled between the intermediate terminal and the second terminal of the transponder.
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16. A system comprising:
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a reader configured to oscillate at a resonance frequency; and a transponder that includes; a resonant circuit having a resonance frequency substantially equal to the resonance frequency of the reader; a memory; a contact zone configured to be contacted by a portion of human body; an enable/disable circuit configured to switch from a first state, in which the enable/disable circuit does not allow the memory to be accessed, to a second state in which the enable/disable circuit allows the memory to be accessed when the resonant circuit of the transponder is contactlessly powered by a reader; an indicator configured to indicate that a portion of human body has contacted the contact zone of the transponder; first and second supply terminals; a first switch coupled in series with the first indicator in a first branch between the supply terminals; first and second resistors coupled to each other in a second branch, parallel to the first branch, between the supply terminals, the resistors being coupled to each other by an intermediate node that is also coupled to a control terminal of the first switch; and a second switch coupled between the intermediate terminal and the second terminal of the transponder. - View Dependent Claims (17, 18, 19)
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20. A transponder comprising:
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a resonant circuit that includes an antenna and a capacitor; a memory; a contact zone configured to be contacted by a portion of human body; an enable/disable circuit configured to switch from a first state, in which the enable/disable circuit does not allow the memory to be accessed, to a second state in which the enable/disable circuit allows the memory to be accessed when the resonant circuit of the transponder is contactlessly powered by a reader; a first indicator configured to indicate that a portion of human body has contacted the contact zone of the transponder; first and second supply terminals; a first switch coupled in series with the first indicator in a first branch between the supply terminals; first and second resistors coupled to each other in a second branch, parallel to the first branch, between the supply terminals, the resistors being coupled to each other by an intermediate node that is also coupled to a control terminal of the first switch; and a second switch coupled between the intermediate terminal and the second terminal of the transponder. - View Dependent Claims (21)
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22. A telephone, comprising:
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a transponder that includes; a resonant circuit that includes an antenna and a capacitor; a memory; a contact zone configured to be contacted by a portion of human body; an enable/disable circuit configured to switch from a first state, in which the enable/disable circuit does not allow the memory to be accessed, to a second state in which the enable/disable circuit allows the memory to be accessed when the resonant circuit of the transponder is contactlessly powered by a reader; an indicator configured to indicate that a portion of human body has contacted the contact zone of the transponder; first and second supply terminals; a first switch coupled in series with the first indicator in a first branch between the supply terminals; first and second resistors coupled to each other in a second branch, parallel to the first branch, between the supply terminals, the resistors being coupled to each other by an intermediate node that is also coupled to a control terminal of the first switch; and a second switch coupled between the intermediate terminal and the second terminal of the transponder. - View Dependent Claims (23)
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Specification