POSITION-DETECTING APPARATUS AND POSITION-INDICATING DEVICE
First Claim
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1. A position-detecting apparatus, comprising:
- a tablet for transmitting an electromagnetic wave; and
a position-indicating device for receiving the electromagnetic wave from the tablet and for generating a transmission signal for indicating a position on the tablet, the position-indicating including a resonance circuit having a coil and a capacitor;
a power supply extraction unit including a rectifying device and a charging capacitor configured to extract a first power supply from a voltage introduced on the coil, the charging capacitor being charged when a voltage generated in the resonance circuit is higher than a voltage retained in the charging capacitor;
an information reply unit configured to transmit information as a reply from the position-indicating device to the tablet; and
a voltage conversion unit configured to generate a second power supply having a predetermined voltage level which is lower than the first power supply extracted by the power supply extraction unit, wherein the information reply unit transmits the information as a reply from the position-indicating device by controlling the resonance circuit based on a control signal generated by a transistor circuit operated by the second power supply.
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Abstract
A position-detecting apparatus includes a tablet for transmitting an electromagnetic wave and a position-indicating device for generating a transmission signal based on the electromagnetic wave received from the tablet. The position-detecting apparatus detects a position on the tablet indicated by the position-indicating device. The position-detecting device includes: a resonance circuit having a coil and a capacitor, a power supply extraction unit, an information reply unit, and a voltage conversion unit configured to generate a second power supply having a predetermined voltage level which is lower than a first power supply extracted by the power supply extraction unit.
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Citations
21 Claims
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1. A position-detecting apparatus, comprising:
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a tablet for transmitting an electromagnetic wave; and
a position-indicating device for receiving the electromagnetic wave from the tablet and for generating a transmission signal for indicating a position on the tablet, the position-indicating including a resonance circuit having a coil and a capacitor;
a power supply extraction unit including a rectifying device and a charging capacitor configured to extract a first power supply from a voltage introduced on the coil, the charging capacitor being charged when a voltage generated in the resonance circuit is higher than a voltage retained in the charging capacitor;
an information reply unit configured to transmit information as a reply from the position-indicating device to the tablet; and
a voltage conversion unit configured to generate a second power supply having a predetermined voltage level which is lower than the first power supply extracted by the power supply extraction unit, wherein the information reply unit transmits the information as a reply from the position-indicating device by controlling the resonance circuit based on a control signal generated by a transistor circuit operated by the second power supply. - View Dependent Claims (2)
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3. A position-indicating device for indicating a position on a tablet by generating a transmission signal to the tablet upon receiving an electromagnetic wave transmitted from the tablet, the position-indicating device comprising:
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a resonance circuit having a coil and a capacitor;
a power supply extraction unit including a rectifying device and a charging device configured to extract a first power supply from an induction voltage introduced into the coil, the charging capacitor being charged when a voltage generated in the resonance circuit is higher than a voltage retained in the charging capacitor;
an information reply unit configured to transmit predetermined information as a reply to the tablet; and
a voltage conversion unit configured to generate a second power supply having a predetermined voltage level which is lower than the first power supply extracted by the power supply extraction unit, wherein the information reply unit transmits the information as a reply from the position-indicating device by controlling the resonance circuit based on a control signal generated by a transistor circuit operated by the second power supply. - View Dependent Claims (4)
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5. A position indicating device for communication with a digitizer tablet device, the position indicating device comprising:
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a resonant circuit for receiving a transmission signal from the tablet;
a power extraction unit for extracting a voltage of the received transmission signal;
a power supply unit in communication with said power extraction unit for powering electronic components of the position-indicating device; and
a voltage regulation unit for regulating transfer of power between said power extraction unit and said power supply unit based on minimum power consumption specifications of the electronic components of the position-indicating device. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A position detecting apparatus, comprising:
- a tablet having a position detection unit with a plurality of loop coils, said tablet transmitting a transmission signal; and
a position-indicating device, comprising;
a resonant circuit for interacting with said loop coils and receiving said transmission signal, and a power management unit for extracting power from the transmission signal received at said resonant circuit, allocating a first amount of power for powering internal circuitry of said position-indicating device and a second amount of power for generating a response signal for transmission back to the tablet, said first amount of power being maintained constant regardless of transmission power of the transmission signal received from the tablet. - View Dependent Claims (19, 20)
- a tablet having a position detection unit with a plurality of loop coils, said tablet transmitting a transmission signal; and
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21. A method of operating a position-indicating device for wireless communication with a digitizer tablet, the method comprising:
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receiving a transmission signal from the tablet onto a resonant circuit in the position-indicating device;
extracting a voltage of the transmission signal using a rectifying device and a first capacitor for storing the extracted voltage;
performing a power supply operation for powering internal circuitry of the position indicating device using a power supply voltage stored on a second capacitor in communication with the first capacitor; and
regulating transfer of power between the first capacitor and the second capacitor so that the power supply voltage stored by the second capacitor is maintained constant regardless of the extracted voltage stored on the first capacitor.
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Specification