INFORMATION TRANSMITTING DEVICE
First Claim
1. A sensor circuit for transmission of information to an external communications device, the sensor circuit comprising:
- a resonant circuit;
a power extracting circuit for extracting power for driving each component from an induced voltage which is generated in the resonant circuit due to externally transmitted electromagnetic waves;
a digital information generator for detecting analog information and generating digital information which corresponds to the analog information and which includes a binary code of two bits or more; and
a resonance characteristic controller for bringing the resonant circuit into a short-circuited state in accordance with any one of ‘
0’ and
‘
1’
of the binary code in synchronization with at least part of the electromagnetic waves,wherein, by transmitting the digital information including the binary code, only one bit of the binary code changes when the corresponding analog information changes, a variation in the power supply voltage is suppressed and the analog information is stably detected.
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Accused Products
Abstract
In an information transmitting device, a variable capacitor which is charged to have a predetermined voltage discharges through a predetermined resistor. Until the voltage becomes lower than a predetermined threshold voltage, the number of AC signals having a predetermined frequency is counted. Accordingly, first continuous amount information of a binary code corresponding to a writing pressure is obtained and is converted to a Gray code, which is regarded as second continuous amount information. A resonant circuit is opened or shorted in accordance with ‘0’ or ‘1’ in the second continuous amount information, so as to transmit the second continuous amount information.
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Citations
17 Claims
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1. A sensor circuit for transmission of information to an external communications device, the sensor circuit comprising:
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a resonant circuit; a power extracting circuit for extracting power for driving each component from an induced voltage which is generated in the resonant circuit due to externally transmitted electromagnetic waves; a digital information generator for detecting analog information and generating digital information which corresponds to the analog information and which includes a binary code of two bits or more; and a resonance characteristic controller for bringing the resonant circuit into a short-circuited state in accordance with any one of ‘
0’ and
‘
1’
of the binary code in synchronization with at least part of the electromagnetic waves,wherein, by transmitting the digital information including the binary code, only one bit of the binary code changes when the corresponding analog information changes, a variation in the power supply voltage is suppressed and the analog information is stably detected. - View Dependent Claims (2, 3, 4)
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5. A method of operating a sensor circuit for transmission of information to an external communication device, the method comprising:
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receiving electromagnetic waves at a resonant circuit, the electromagnetic waves inducing a current in the resonant circuit; extracting power from the induced current for driving each component of the sensor circuit; detecting analog information and generating digital information therefrom, the digital information having a plurality of bits being represented in a code having a hamming distance of one; and
modifying characteristics of the resonant circuit in accordance with values of the bits o f digital information in synchronization with at least part of the electromagnetic waves for transmitting the digital information to the external communication device.
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6. A sensor circuit for transmission of information to an external communications device, the sensor circuit comprising:
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a resonant circuit for receiving electromagnetic waves, the electromagnetic waves inducing a current in the resonant circuit; a power extracting circuit for extracting power from the inducted current for driving each component of the sensor circuit; a sensor for sensing analog information; a digital information generator for generating digital information from the sensed analog information, the digital information having a plurality of bits being represented in a code having a hamming distance of one; and a resonance characteristic controller for modifying characteristics of the resonant circuit in accordance with values of the bits of digital information in synchronization with at least part of the electromagnetic waves for transmitting the digital information to the external communications device. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification