WO2021196104A1 - Wireless pressure-sensitive digitizer apparatus - Google Patents

Wireless pressure-sensitive digitizer apparatus Download PDF

Info

Publication number
WO2021196104A1
WO2021196104A1 PCT/CN2020/082873 CN2020082873W WO2021196104A1 WO 2021196104 A1 WO2021196104 A1 WO 2021196104A1 CN 2020082873 W CN2020082873 W CN 2020082873W WO 2021196104 A1 WO2021196104 A1 WO 2021196104A1
Authority
WO
WIPO (PCT)
Prior art keywords
chip
pin
circuit
coil
resistor
Prior art date
Application number
PCT/CN2020/082873
Other languages
French (fr)
Chinese (zh)
Inventor
江睿晖
李亮
周品智
周品艺
Original Assignee
深圳市品致信息科技有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 深圳市品致信息科技有限公司 filed Critical 深圳市品致信息科技有限公司
Priority to PCT/CN2020/082873 priority Critical patent/WO2021196104A1/en
Publication of WO2021196104A1 publication Critical patent/WO2021196104A1/en

Links

Images

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
    • G06F3/0354—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor with detection of 2D relative movements between the device, or an operating part thereof, and a plane or surface, e.g. 2D mice, trackballs, pens or pucks

Definitions

  • the invention relates to the technical field of digital tablets, in particular to a wireless pressure-sensitive digital tablet device.
  • the digital tablet is a commonly used human-machine interface device based on the principle of electromagnetic induction.
  • the digital tablet has the characteristics of high precision and sensitivity to pressure, and is widely used in computer graphics processing, game production, digital signature and other fields.
  • users can write, sign or draw pictures on the tablet with the pen that comes with the tablet.
  • the tablet can capture the trajectory of the pen and the pressure of the pen on the tablet during handwriting to obtain the corresponding handwritten input data. Then the handwritten input data is transmitted to the computer in the form of a digital signal, and the computer processes the data and generates the corresponding handwriting to the display device for display.
  • the working principle of the tablet is as follows:
  • the loop antenna of the tablet and the resonant circuit of the pen can emit alternating electromagnetic fields.
  • the loop antenna of the tablet receives the electromagnetic field of the pen.
  • the tablet can accurately locate the position of the pen tip.
  • pens are divided into two types: active pens and passive pens. Active pens with batteries can generate electromagnetic fields by themselves, while passive pens without batteries need to reflect the electromagnetic fields generated by the tablet.
  • Pressure induction is generated by the movable part of the pen structure and fed back to the tablet through electromagnetic signals.
  • the purpose of the present invention is to provide a wireless pressure-sensitive digital tablet device, which can not only ensure the positioning accuracy of the pen, but also reduce the manufacturing cost.
  • the present invention provides the following solutions:
  • a wireless pressure-sensitive digital tablet device including a digital tablet and a pen
  • the digital tablet includes an MCU module, a coil selection circuit, and an antenna matrix; the pen is provided with a resonance circuit;
  • the MCU module includes an MCU chip and a transmitting and receiving switch circuit; the MCU chip is integrated with a curve fitting algorithm; the MCU chip is used to generate a rectangular wave signal; the antenna matrix includes a set of transverse loop coils and A group of longitudinal loop coils extending in the longitudinal direction, and the transverse loop coil and the longitudinal loop coil are orthogonal to each other;
  • the MCU chip is respectively connected to the coil selection circuit and the transmitting and receiving circuit;
  • the antenna matrix is respectively connected to the coil selection circuit and the transmitting and receiving circuit;
  • the MCU chip is used to control the coil selection circuit to select a first transverse loop coil or a first longitudinal loop coil in the antenna matrix, and connect the first transverse loop coil or the first longitudinal loop coil Connected to the transmitting and receiving switch circuit; the MCU chip is also used to transmit the rectangular wave signal to the first transverse toroidal coil or the first longitudinal toroidal coil through the transmitting and receiving switch circuit to generate corresponding Electromagnetic wave signal; wherein, the working mode of the first transverse toroidal coil or the first longitudinal toroidal coil is the transmitting mode;
  • the resonant circuit is used to receive the electromagnetic wave signal generated by the tablet and generate an induced voltage according to the electromagnetic wave signal when the distance between the pen and the antenna matrix is within a set threshold, and then the The induced voltage is converted into a resonance wave signal;
  • the MCU chip is also used to control the coil selection circuit to select a second transverse loop coil or a second longitudinal loop coil in the antenna matrix, and connect the second transverse loop coil or the second longitudinal loop coil
  • the coil is connected to the transmitting and receiving switch circuit; wherein, the working mode of the second horizontal toroidal coil or the second longitudinal toroidal coil is the receiving mode;
  • the resonant circuit is also used to send the resonant wave signal to the second transverse toroidal coil or the second longitudinal toroidal coil to generate an electrical signal, and to send the electrical signal to the transmitting and receiving switch circuit through the transmitting and receiving switch circuit
  • the MCU chip
  • the MCU chip is also used to calculate the abscissa and ordinate values of the pen tip on the tablet and the pressure value of the pen when writing according to the electrical signal and the integrated curve fitting algorithm.
  • the MCU module further includes a receiving control circuit; the ANTY port of the coil selection circuit is connected to the 218th resistor of the receiving control circuit, and the ANTX port of the coil selection circuit is connected to the receiving control circuit.
  • the 318th resistor of the control circuit is connected; the 254th resistor and the 217th resistor of the receiving control circuit are respectively connected to the DIS_SIGNAL_B port of the transmitting and receiving switch circuit; the receiving control The three hundred and fifty-fourth resistor and the three-hundred seventeenth resistor of the circuit are respectively connected with those of the transmitting and receiving switch circuit.
  • the receiving control circuit is connected to the MCU chip; the receiving control circuit is used to receive an instruction from the MCU chip to control the loop coil in the antenna matrix to send signals while disabling the receiving function.
  • the MCU module further includes a signal processing unit; the signal processing unit includes a band-pass filter circuit, an amplifying circuit, an integration circuit, and an analog-to-digital conversion circuit that are sequentially connected; wherein, the band-pass filter circuit and the The transmitting and receiving switch circuit is connected, and the analog-to-digital conversion circuit is connected with the MCU chip.
  • the signal processing unit includes a band-pass filter circuit, an amplifying circuit, an integration circuit, and an analog-to-digital conversion circuit that are sequentially connected; wherein, the band-pass filter circuit and the The transmitting and receiving switch circuit is connected, and the analog-to-digital conversion circuit is connected with the MCU chip.
  • the antenna matrix includes 24 transverse loop coils and 16 longitudinal loop coils; wherein the output end of each transverse loop coil is connected to the ANT_GND_A port of the antenna matrix, and each transverse loop coil is connected to the ANT_GND_A port of the antenna matrix.
  • the loop coils are all connected to the horizontal test point; the output end of each longitudinal loop coil is connected to the ANT_GND_B port of the antenna matrix, and each of the longitudinal loop coils is connected to the longitudinal test point; the ANT_GND_A port passes The resistor is connected to the ANT_GND_B port.
  • the transmitting and receiving switch circuit is used to switch the transmitting mode and the receiving mode of the loop coil in the antenna matrix;
  • the transmitting and receiving switch circuit includes a fourth chip and a peripheral circuit connected to the fourth chip;
  • the first pin of the fourth chip is connected to the eleventh pin of the MCU chip, and the first pin of the fourth chip is used to turn on the transmission mode of the longitudinal loop coil; the first pin of the fourth chip
  • the second pin is connected to one end of the eleventh resistor, and the other end of the eleventh resistor is connected to the tenth pin of the MCU chip;
  • the third pin of the fourth chip is used to transmit a rectangular wave signal To the coil selection circuit and the longitudinal loop coil of the antenna matrix, the third pin of the fourth chip is connected to one end of the twelfth capacitor, and the other end of the twelfth capacitor is respectively connected to the antenna matrix
  • the longitudinal test point, one end of the 240th resistor and the ANTY port of the coil selection circuit are connected;
  • the fourth pin of the fourth chip is the DIS_OPA_B port corresponding to the 42nd pin of the MCU chip Connected, the fourth pin of the fourth chip is used to turn on the receiving mode of the longitudinal loop coil;
  • the tenth pin of the fourth chip is connected to the DIS_OPA_A port corresponding to the twelfth pin of the MCU chip, and the tenth pin of the fourth chip is used to enable the receiving mode of the transverse loop coil;
  • the eleventh pin of the fourth chip is connected to one end of the one hundred and fifty-third capacitor, and the other end of the one hundred and fifty-third capacitor is connected to the lateral test point of the antenna matrix.
  • the fifty-three capacitor is used to transmit the rectangular wave signal to the coil selection circuit and the transverse loop coil of the antenna matrix; the other end of the two hundred and fortieth resistor is connected to the ANTX port of the coil selection circuit;
  • the twelfth pin of the fourth chip is connected to one end of the two hundred and thirty-ninth resistor, and the other end of the two hundred and thirty-ninth resistor is connected to the tenth pin of the MCU chip;
  • the fourth chip The thirteenth pin of the fourth chip is connected to the eleventh pin of the MCU chip, and the thirteenth pin of the fourth chip is used to turn on the transmission mode of the transverse loop coil; the tenth pin of the fourth chip
  • the four pins are respectively connected in parallel with one end of the positive voltage source and one end of the eleventh capacitor, and the other end of the eleventh capacitor is grounded.
  • the coil selection circuit includes a first set of chips and a second set of chips; the first set of chips includes a seventh chip, a tenth chip, and an eleventh chip; the second set of chips includes a ninth chip And the twelfth chip;
  • the seventh chip, the tenth chip, and the eleventh chip are respectively connected to the transverse loop coil;
  • the ninth chip and the twelfth chip are respectively connected to the longitudinal loop coil;
  • the seventh chip, the tenth chip, and the sixth pin of the eleventh chip are connected to the MCU chip; the seventh chip, the tenth chip, and the eleventh chip The six pins are used to select the chip connected to the transverse loop coil according to the instruction of the MCU chip;
  • the sixth pin of the ninth chip and the twelfth chip is connected to the MCU chip; the sixth pin of the ninth chip and the twelfth chip is used for instructions from the MCU chip Select the chip connected to the longitudinal loop coil.
  • the sixth pin of the fourth chip of the transmit-receive switch circuit is connected to the DIS_SIGNAL_B port of the band-pass filter circuit, and the eighth pin of the fourth chip of the transmit-receive switch circuit is connected to the band-pass filter circuit.
  • the two hundred and tenth resistor of the receiving control circuit of the MCU module is respectively connected to the two hundred and twentieth resistor and the 320th resistor of the band-pass filter circuit.
  • the MCU chip is used to generate a continuous rectangular wave signal according to a pulse width modulation technique.
  • the present invention discloses the following technical effects:
  • the invention relates to a computer peripheral device, in particular to a wireless pressure sensitive digital tablet device.
  • the main function of the device is to convert the handwriting into the horizontal and vertical coordinates and pressure values in the form of digital signals. Through the corresponding hardware and algorithm, the handwriting drawn by the user on the tablet can be displayed on the screen.
  • This wireless pressure-sensitive digital tablet device is used in the fields of painting and handwriting recognition, not only to ensure the positioning accuracy of the pen, but also to reduce manufacturing costs.
  • Figure 1 is a structural block diagram of the wireless pressure sensitive digital tablet device of the present invention.
  • FIG. 2 is a schematic diagram of the structure of the MCU chip of the present invention.
  • Figure 3 is a chip structure diagram of the antenna matrix of the present invention.
  • Fig. 4 is a structural diagram of the transmitting and receiving switch circuit of the present invention
  • Fig. 4(a) is a structural diagram of a fourth chip
  • Fig. 4(b) is a structural diagram of a peripheral circuit
  • Figure 5 is a structural diagram of the coil selection circuit of the present invention
  • Figure 5 (a) is a structural diagram of the first group of chips
  • Figure 5 (b) is a structural diagram of the second group of chips
  • Figure 6 is a structural diagram of the receiving control circuit of the present invention
  • Figure 6 (a) is a structural diagram of the first part of the receiving control circuit
  • Figure 6 (b) is a structural diagram of the second part of the receiving control circuit
  • Figure 7 is a structural diagram of the band-pass filter circuit of the present invention
  • Figure 7 (a) is a structural diagram of the first part of the band-pass filter circuit
  • Figure 7 (b) is a structural diagram of the second part of the band-pass filter circuit
  • Fig. 8 is a structural diagram of the amplifying circuit of the present invention
  • Fig. 8(a) is a structural diagram of the first part of the amplifying circuit
  • Fig. 8(b) is a structural diagram of the second part of the amplifying circuit
  • Fig. 9 is a structural diagram of the integrating circuit of the present invention
  • Fig. 9(a) is a structural diagram of the first part of the integrating circuit
  • Fig. 9(b) is a structural diagram of the second part of the integrating circuit.
  • the present invention provides a wireless pressure-sensitive digital tablet device, in which the term "wireless” means that there is no wire connection between the pen and the digital tablet.
  • the term “pressure sensitive” means that the tablet can measure the pressure of the pen while writing.
  • a curve fitting algorithm is used on the tablet to determine the abscissa and ordinate values of the pen tip on the tablet and the pressure value of the pen when writing.
  • the wireless pressure-sensitive tablet device includes a tablet and a pen.
  • the tablet includes MCU module, coil selection circuit and antenna matrix.
  • the MCU module includes an MCU chip, a transmitting and receiving switch circuit, a receiving control circuit, and a signal processing unit;
  • the signal processing unit includes a band-pass filter circuit, an amplifying circuit, an integrating circuit, and an analog-to-digital conversion circuit connected in sequence.
  • the band-pass filter circuit is mainly connected with the transmitting and receiving switch circuit, and the analog-to-digital conversion circuit is connected with the MCU chip.
  • the receiving control circuit is respectively connected with the transmitting and receiving switch circuit, the antenna matrix and the MCU chip.
  • the MCU chip integrates a curve fitting algorithm; the curve fitting algorithm can combine the received digital signal to calculate the horizontal and vertical coordinates of the pen tip on the tablet and the pressure value of the pen when writing.
  • the MCU chip is used to generate a continuous rectangular wave signal according to the pulse width modulation technology.
  • the antenna matrix includes a plurality of loop coils, specifically including a set of transverse loop coils extending in the transverse direction and a set of longitudinal loop coils extending in the longitudinal direction, and the transverse loop coils and the longitudinal loop coils are orthogonal to each other.
  • the MCU chip is respectively connected with the coil selection circuit and the transmitting and receiving circuit; the antenna matrix is respectively connected with the coil selecting circuit and the transmitting and receiving circuit.
  • the MCU chip is used to control the coil selection circuit to select a first transverse loop coil or a first longitudinal loop coil in the antenna matrix, and connect the first transverse loop coil or the first longitudinal loop coil to the transmitting and receiving switch circuit; the MCU chip also Used to transmit the rectangular wave signal to the first transverse loop coil or the first longitudinal loop coil through the transmitting and receiving switch circuit to generate the corresponding electromagnetic wave signal; at this time, the working mode of the first transverse loop coil or the first longitudinal loop coil is the transmitting mode .
  • the resonance circuit When the distance between the pen and the antenna matrix is within the set threshold, the resonance circuit is used to receive the electromagnetic wave signal generated by the tablet and generate an induced voltage according to the electromagnetic wave signal, and then convert the induced voltage into a resonance wave signal.
  • the process of converting the induced voltage into a resonance wave signal is an induced current generated when the induced voltage is within a set threshold between the pen and the tablet, and then the induced current generates a corresponding resonance wave signal in the resonance circuit.
  • the MCU chip is also used to control the coil selection circuit to select a second transverse loop coil or a second longitudinal loop coil in the antenna matrix, and connect the second transverse loop coil or the second longitudinal loop coil to the transmitting and receiving switch circuit; ,
  • the working mode of the second transverse loop coil or the second longitudinal loop coil is the receiving mode.
  • the resonant circuit is also used to send the resonant wave signal to the second transverse loop coil or the second longitudinal loop coil to generate an electric signal, and send the electric signal to the MCU chip through the transmitting and receiving switch circuit.
  • the MCU chip is also used to calculate the horizontal and vertical coordinates of the pen tip on the tablet and the pressure value of the pen when writing according to the electrical signal and the integrated curve fitting algorithm.
  • the transmission mode of the loop coil is specifically: the MCU chip uses pulse width modulation (PWM) technology to generate a rectangular wave signal A.
  • PWM pulse width modulation
  • the MCU chip controls the coil selection circuit, selects a transverse loop coil or a longitudinal loop coil in the horizontal and vertical directions of the antenna matrix, and connects the selected loop coil with the transmitting and receiving switch circuit; then the MCU chip controls the transmitting and receiving switch circuit to be rectangular
  • the wave signal A is transmitted to the selected loop coil, and the selected loop coil generates the corresponding electromagnetic wave B. If the pen is close to the loop coil, the resonant circuit on the pen receives the electromagnetic wave B and generates an induced voltage.
  • the current generated by the induced voltage in the resonant circuit on the pen generates a corresponding resonant wave signal C in the resonant circuit.
  • the receiving mode of the loop coil is specifically: the MCU chip controls the coil selection circuit to select a horizontal loop coil or a vertical loop coil in the horizontal and vertical directions of the antenna matrix.
  • the loop coil receives the resonant wave signal C generated by the pen, and then generates an electromagnetic wave signal D, and sends the electromagnetic wave signal D to the transmitting and receiving switch circuit and the receiving control circuit controlled by the MCU chip, and then transmits it to the band-pass filter circuit for filtering.
  • the filtered signal E is amplified by the amplifier circuit.
  • the amplified signal F is input to the integrating circuit, and then the integrated signal G is transmitted to the digital-to-analog conversion circuit and converted into a corresponding digital signal. Finally, the digital signal is transmitted to the digital signal processing part of the MCU chip.
  • the process of determining the vertical coordinate value of the pen tip on the tablet and the pressure value of the pen when writing is as follows: First, the MCU chip selects a transverse loop coil to enter the transmit mode, after a preset period of time, it stops and switches to the receiving mode, and then records the pen The digital signal obtained by the conversion of the resonant wave. After traversing all the transverse loop coils in turn, the MCU chip compares all recorded digital signals and finds the maximum value. The transverse loop coil A represented by the maximum value is the transverse loop coil closest to the pen. Then the MCU chip selects the horizontal toroidal coil group B with the horizontal toroidal coil A as the center and expands the preset number of horizontal toroidal coils up and down.
  • the MCU chip selects the transverse loop coil A to enter the transmit mode, stops after a preset time and switches to select a transverse loop coil in the transverse loop coil group B to enter the receive mode and record the digital signal converted by the pen's resonance wave. After sequentially traversing all the transverse loop coils in the transverse loop coil group B, according to the recorded digital signal, a curve fitting algorithm is used to calculate the ordinate value of the pen tip on the tablet and the pressure value of the pen when writing.
  • the determination process of the abscissa value of the pen tip on the tablet and the pressure value of the pen when writing is as follows: First, the MCU chip selects a longitudinal loop coil to enter the transmit mode, and then stops after a preset period of time. And switch to the receiving mode, and then record the digital signal converted by the pen's resonance wave. After traversing all the longitudinal loop coils in turn, the MCU chip compares all recorded digital signals and finds the maximum value. The longitudinal loop coil C represented by the maximum value is the longitudinal loop coil closest to the pen. Subsequently, the MCU chip selects the longitudinal toroidal coil group D with the longitudinal toroidal coil C as the center and expands a preset number of up and down sides.
  • the MCU chip selects the longitudinal loop coil C to enter the transmit mode, stops after a preset time and switches to select a longitudinal loop coil in the longitudinal loop coil group D to enter the receive mode and record the digital signal converted by the pen's resonance wave. After successively traversing all the longitudinal loop coils in the longitudinal loop coil group D, according to the recorded digital signal, a curve fitting algorithm is used to calculate the abscissa value of the pen tip on the tablet and the pressure value of the pen when writing.
  • the horizontal and vertical coordinates of the pen tip on the tablet and the pressure value of the pen when writing are determined.
  • FIG 2 is a schematic diagram of the structure of the MCU chip of the present invention. As shown in Figure 2, the MCU chip is represented by the eighth chip (chip U8), and its model is E103C8T6.
  • the antenna matrix includes 24 transverse loop coils and 16 longitudinal loop coils.
  • the output terminals of the transverse loop coils are respectively connected to the ANT_GND_A port. Each transverse loop coil extending in the transverse direction is connected to a transverse test point.
  • the output terminals of the longitudinal loop coils (Y01, Y02...Y10...Y16) are respectively connected to the ANT_GND_B port.
  • Each longitudinal loop coil extending in the longitudinal direction is connected to a longitudinal test point.
  • One end of the resistor R247 is connected to the ANT_GND_A port.
  • the other end of the resistor R247 is connected to the ANT_GND_B port.
  • the transmitting and receiving switch circuit provided by the present invention is used to switch the transmitting mode and the receiving mode of the loop coil in the antenna matrix.
  • the transmitting and receiving switch circuit includes a fourth chip and a peripheral circuit connected to the fourth chip; the fourth chip is represented by chip U4, and its model is 74HC125PW.
  • the first pin 1 of the chip U4 is connected to the eleventh pin 11 of the MCU chip, and the first pin 1 of the chip U4 is used to enable the transmission mode of the longitudinal loop coil.
  • the second pin 2 of the chip U4 is connected to one end of the eleventh resistor R11, and the other end of the eleventh resistor R11 is connected to the tenth pin 10 of the MCU chip.
  • the third pin 3 of the chip U4 is used to transmit the rectangular wave signal A to the coil selection circuit and the longitudinal loop coil of the antenna matrix.
  • the third pin 3 of the chip U4 is connected to one end of the twelfth capacitor C12, the twelfth capacitor The other end of C12 is connected to the longitudinal test point, one end of the two hundred and fortieth resistor R240 and the ANTY port of the coil selection circuit.
  • the fourth pin 4 of the chip U4 is connected to the DIS_OPA_B port corresponding to the 42nd pin 42 of the MCU chip, and the fourth pin 4 of the chip U4 is used to enable the receiving mode of the longitudinal loop coil.
  • the fifth pin 5 of the chip U4 is grounded, and the sixth pin 6 of the chip U4 is connected to the DIS_SIGNAL_B port of the receiving control circuit.
  • the seventh pin 7 of the chip U4 is grounded, the eighth pin 8 of the chip U4 is connected to the DIS_SIGNAL_A port of the receiving control circuit, and the ninth pin 9 of the U4 chip is connected to the ground.
  • the tenth pin 10 of the chip U4 is connected to the DIS_OPA_A port corresponding to the twelfth pin 12 of the MCU chip, and the tenth pin 10 of the chip U4 is used to enable the receiving mode of the transverse loop coil.
  • the eleventh pin 11 of the chip U4 is connected to one end of the 153rd capacitor C153, and the other end of the 153rd capacitor C153 is connected to the horizontal test point.
  • the eleventh pin 11 of the chip U4 is used to connect the rectangular The wave signal A is transmitted to the coil selection circuit and the transverse loop coil of the antenna matrix.
  • the other end of the two hundred and fortieth resistor R240 is connected to the ANTX port of the coil selection circuit.
  • the twelfth pin 12 of the chip U4 is connected to one end of the two hundred and thirty-ninth resistor R239, and the other end of the two hundred and thirty-ninth resistor R239 is connected to the tenth pin 10 of the MCU chip.
  • the thirteenth pin 13 of the chip U4 is connected to the tenth pin 10 of the MCU chip, and the thirteenth pin 13 of the chip U4 is used to enable the transmission mode of the transverse loop coil.
  • the fourteenth pin 14 of the chip U4 is respectively connected in parallel with one end of the five-volt positive voltage source and one end of the eleventh capacitor C11. The other end of the eleventh capacitor C11 is grounded.
  • the purpose of the coil selection circuit is to control and select the loop coil of the antenna matrix in the horizontal and vertical directions by the MCU chip to connect to the transmitting and receiving switch circuit.
  • the coil selection circuit includes a first set of chips and a second set of chips; the first set of chips includes a seventh chip, a tenth chip, and an eleventh chip; the second set of chips includes a ninth chip and a twelfth chip.
  • the seventh chip, the tenth chip and the eleventh chip are respectively connected to the transverse loop coil.
  • the ninth chip and the twelfth chip are respectively connected to the longitudinal loop coil.
  • the sixth pin of the seventh chip, the tenth chip and the eleventh chip are connected to the MCU chip; the sixth pin of the seventh chip, the tenth chip and the eleventh chip are used to select and horizontally ring according to the instructions of the MCU chip The chip to which the coil is connected.
  • the sixth pin of the ninth chip and the twelfth chip is connected to the MCU chip; the sixth pin of the ninth chip and the twelfth chip is used to select the chip connected to the longitudinal loop coil according to the instruction of the MCU chip.
  • the seventh chip is represented by chip U7
  • the ninth chip is represented by chip U9
  • the tenth chip is represented by chip U10
  • the eleventh chip is represented by chip U11
  • the twelfth chip is represented by chip U12.
  • the rectangular wave signal A generated by the MCU chip (chip U8) is input to the pin 3 (X port terminal) of the chip U7, the chip U10 and the chip U11 through the ANTX port as shown in FIG. 2 respectively. Input to the pin 3 (X port end) of chip U99 and chip U12 through the ANTY port as shown in Figure 2.
  • the X0 ⁇ X7 ports corresponding to pin 13, pin 14, pin 15, pin 12, pin 1, pin 5, pin 2, and pin 4 are respectively in the X direction (horizontal) It is connected with loop coil X03, loop coil X02, loop coil X01, loop coil X04, loop coil X08, loop coil X05, loop coil X07, and loop coil X06 in the antenna matrix.
  • the port is controlled by the X_ADR_3 port of the MCU chip.
  • the pin 6 of the chip U7 is used to receive the instruction of the MCU chip and select the chip U7 in the coil selection circuit according to the instruction of the MCU chip.
  • the pin 11, pin 10, and pin 9 of the chip U7 corresponding to the A port, B port, and C port are used to select one of the X0 ⁇ X7 ports in the chip U7, and are determined by the X_ADR_0 port, X_ADR_1 port, and X_ADR_2 port of the MCU chip. Port control.
  • the VDD port corresponding to the pin 16 of the chip U7 is respectively connected in parallel with one end of the five-volt positive voltage source and one end of the capacitor C31, and the other end of the capacitor C31 is grounded.
  • the VEE port corresponding to pin 7 of the chip U7 is connected in parallel with one end of the five-volt negative voltage source and one end of the capacitor C32, and the other end of the capacitor C32 is grounded.
  • the X0 ⁇ X7 ports corresponding to pin 13, pin 14, pin 15, pin 12, pin 1, pin 5, pin 2, and pin 4 are respectively in the X direction (horizontal) It is connected with loop coil X11, loop coil X10, loop coil X09, loop coil X12, loop coil X16, loop coil X13, loop coil X15, and loop coil X14 in the antenna matrix.
  • the port is controlled by the X_ADR_4 port of the MCU chip.
  • the pin 6 of the chip U10 is used to receive the instruction of the MCU chip and select the chip U10 in the coil selection circuit according to the instruction of the MCU chip.
  • the A, B, and C ports corresponding to pin 11, pin 10, and pin 9 of the chip U10 are used for one of the X0 ⁇ X7 ports in the chip U10, which are controlled by the X_ADR_0 port, X_ADR_1 port, and X_ADR_2 port of the MCU chip .
  • the VDD port corresponding to the pin 16 of the chip U10 is respectively connected in parallel with one end of the five-volt positive voltage source and one end of the capacitor C39, and the other end of the capacitor C39 is grounded.
  • the VEE port corresponding to pin 7 of the chip U10 is respectively connected in parallel with one end of the five-volt negative voltage source and one end of the capacitor C40, and the other end of the capacitor C40 is grounded.
  • the X0 ⁇ X7 ports corresponding to pin 13, pin 14, pin 15, pin 12, pin 1, pin 5, pin 2, and pin 4 are respectively in the X direction (horizontal) It is connected to the loop coil X19, loop coil X18, loop coil X17, loop coil X20, loop coil X24, loop coil X21, loop coil X23, and loop coil X22 in the antenna matrix.
  • the port is controlled by the X_ADR_5 port of the MCU chip.
  • the pin 6 of the chip U11 is used to receive the instruction of the MCU chip and select the chip U11 in the coil selection circuit according to the instruction of the MCU chip.
  • the A, B, and C ports corresponding to pin 11, pin 10, and pin 9 of the chip U11 are used to select one of the X0 ⁇ X7 ports in the chip U11, which is determined by the X_ADR_0 port, X_ADR_1 port, and X_ADR_2 port of the MCU chip. control.
  • the VDD port corresponding to pin 16 of the chip U11 is respectively connected in parallel with one end of the five-volt positive voltage source and one end of the capacitor C47, and the other end of the capacitor C47 is grounded.
  • the VEE port corresponding to pin 7 of the chip U11 is connected in parallel with one end of the five-volt negative voltage source and one end of the capacitor C48, and the other end of the capacitor C48 is grounded.
  • the X0 ⁇ X7 ports corresponding to pin 13, pin 14, pin 15, pin 12, pin 1, pin 5, pin 2, and pin 4 are in the Y direction (vertical) respectively It is connected with loop coil Y03, loop coil Y02, loop coil Y01, loop coil Y04, loop coil Y08, loop coil Y05, loop coil Y07, and loop coil Y06 in the antenna matrix.
  • the port is controlled by the Y_ADR_3 port of the MCU chip.
  • the pin 6 of the chip U9 is used to receive the instruction of the MCU chip and select the chip U9 in the coil selection circuit according to the instruction of the MCU chip.
  • the pin 11, pin 10, and pin 9 of the chip U9 corresponding to the A port, B port, and C port are used to select one of the X0 ⁇ X7 ports in the chip U9, which is determined by the Y_ADR_0 port, Y_ADR_1 port, and Y_ADR_2 port of the MCU chip. control.
  • the VDD port corresponding to the pin 16 of the chip U9 is respectively connected in parallel with one end of the five-volt positive voltage source and one end of the capacitor C41, and the other end of the capacitor C41 is grounded.
  • the VEE-shaped port corresponding to pin 7 of the chip U9 is respectively connected in parallel with one end of the five-volt negative voltage source and one end of the capacitor C42. The other end of the capacitor C42 is grounded.
  • the X0 ⁇ X7 ports corresponding to pin 13, pin 14, pin 15, pin 12, pin 1, pin 5, pin 2, and pin 4 are respectively in the Y direction (vertical) It is connected with loop coil Y11, loop coil Y10, loop coil Y09, loop coil Y12, loop coil Y16, loop coil Y13, loop coil Y15, and loop coil Y14 in the antenna matrix.
  • the port is controlled by the Y_ADR_4 port of the MCU chip.
  • the pin 6 of the chip U10 is used to receive the instruction of the MCU chip and select the chip U10 in the coil selection circuit according to the instruction of the MCU chip.
  • the A, B, and C ports corresponding to pin 11, pin 10, and pin 9 of the chip U10 are used to select one of the X0 ⁇ X7 ports in the chip U10, which is determined by the Y_ADR_0 port, Y_ADR_1 port, and Y_ADR_2 port of the MCU chip. control.
  • the VDD port corresponding to the pin 16 of the chip U10 is respectively connected in parallel with one end of the five-volt positive voltage source and one end of the capacitor C49, and the other end of the capacitor C49 is grounded.
  • the VEE-shaped port corresponding to pin 7 of the chip U10 is connected in parallel with one end of the five-volt negative voltage source and one end of the capacitor C50, and the other end of the capacitor C50 is grounded.
  • the receiving control circuit includes two parts.
  • the first part and the second part together constitute the receiving control circuit of the present invention; the receiving control circuit is used to receive instructions from the MCU chip to control the loop coils in the antenna matrix to send signals. Disable the receiving function at the same time.
  • the ANTY port of the coil selection circuit is connected to one end of the 218th resistor (represented by the resistor R218) of the receiving control circuit, and the other end of the resistor R218 is connected to the resistor R230 and the first end of the resistor R218.
  • One end of the 254 resistor (represented by the resistor R254), the resistor R206, and the resistor R223 are connected.
  • the other end of the resistor R230 is connected to the analog ground
  • the other end of the resistor R254 is connected to the DIS_SIGNAL_B port of the transmitting and receiving switch circuit
  • the other end of the resistor R206 is connected in parallel with one end of the resistor R219 and the pin 3 of the amplifier U22A
  • the other end of the resistor R219 is connected to the analog Connected to ground.
  • the other end of the resistor R223 is respectively connected in parallel with one end of the resistor R207, the pin 1 of the amplifier U22A, one end of the 217th resistor (represented by the resistor R217), and one end of the resistor R210.
  • the other end of the resistor R207 is connected in parallel with the pin 2 of the amplifier U22A and one end of the resistor R209 respectively.
  • the other end of the resistor R209 is connected to one end of the resistor R208, and the other end of the resistor R209 is also connected to the analog ground.
  • the other end of the resistor R208 is connected to the terminal ANT_GND_B.
  • the other end of the resistor R217 is connected to the DIS_SIGNAL_B port of the transmitting and receiving switch circuit.
  • the other end of the resistor R210 is connected to one end of the resistor R220 of the band-pass filter circuit.
  • the amplifier U22A pin 4 is connected to a 3.3V negative voltage source, and the amplifier U22A pin 8 is connected to a 3.3V positive voltage source.
  • the ANTX port of the coil selection circuit is connected to one end of the 318th resistor (represented by the resistor R318) of the receiving control circuit, and the other end of the resistor R318 is connected to the resistor R330 and the third resistor.
  • One end of one hundred and fifty-four resistors represented by resistor R354
  • the other end of the resistor R330 is connected to the analog ground
  • the other end of the resistor R354 is connected to the DIS_SIGNAL_A port of the transmitting and receiving switch circuit.
  • the other end of the resistor R306 is respectively connected in parallel with one end of the resistor R319 and the pin 3 of the amplifier U32A.
  • the other end of the resistor R319 is connected to the analog ground.
  • the other end of the resistor R323 is connected in parallel with one end of the resistor R307, the pin 1 of the amplifier U32A, one end of the 317th resistor (represented by the resistor R317), and one end of the resistor R310, respectively.
  • the other end of the resistor R307 is connected in parallel with the pin 2 of the amplifier U32A and one end of the resistor R309 respectively.
  • the other end of the resistor R309 is connected to one end of the resistor R308, and the other end of the resistor R309 is also connected to the analog ground.
  • the other end of the resistor R308 is connected to the ANT_GND_A port.
  • the other end of the resistor R317 is connected to the DIS_SIGNAL_A port of the transmitting and receiving switch circuit.
  • the other end of the resistor R210 is connected to one end of the resistor R320 of the band-pass filter circuit.
  • the amplifier U32A pin 4 is connected to a 3.3V negative voltage source, and the amplifier U32A pin 8 is connected to a 3.3V positive voltage source.
  • the band-pass filter circuit includes two parts, the first part and the second part together constitute the band-pass filter circuit of the present invention.
  • Band-pass filter circuit is used to pass signals with frequencies between 450KHz and 550KHz.
  • the other end of the resistor R220 is connected in parallel with one end of the resistor R232 and one end of the capacitor C138, respectively.
  • the other end of the resistor R232 is connected in parallel with the pin 3 of the amplifier U20A and one end of the capacitor C175 respectively.
  • the other end of the capacitor C175 is grounded.
  • the other end of the capacitor C138 is respectively connected to the pin 1, one end of the resistor R238 and one end of the resistor R233 of the amplifier U20A.
  • the other end of the resistor R233 is respectively connected to the pin 2 of the amplifier U20A and one end of the resistor R222.
  • the other end of the resistor R222 is grounded.
  • the amplifier U20A pin 4 is connected to a 3.3V negative voltage source, and the amplifier U20A pin 8 is connected to a 3.3V positive voltage source.
  • the other end of the resistor R238 is connected to one end of the capacitor C151.
  • the other end of the capacitor C151 is connected in parallel with one end of the resistor R237 and one end of the capacitor C152, respectively.
  • the other end of the capacitor C152 is connected in parallel with the pin 5 of the amplifier U20B and one end of the resistor R234 respectively.
  • the other end of the resistor R234 is grounded.
  • the other end of the resistor R237 is connected in parallel with one end of the resistor R236 and the pin 7 of the amplifier U20B respectively.
  • the other end of the resistor R236 is connected in parallel with the pin 6 of the amplifier U20B and one end of the resistor R235 respectively.
  • the other end of the resistor R235 is grounded.
  • Amplifier U20B pin 4 is connected to a 3.3V negative voltage source, and amplifier U20B pin 8 is connected to a 3.3V positive voltage source.
  • the other end of the resistor R320 is connected in parallel with one end of the resistor R332 and one end of the capacitor C338, respectively.
  • the other end of the resistor R332 is connected in parallel with the pin 3 of the amplifier U30A and one end of the capacitor C375 respectively.
  • the other end of the capacitor C375 is grounded.
  • the other end of the capacitor C338 is respectively connected to the pin 1, one end of the resistor R338 and one end of the resistor R333 of the amplifier U30A.
  • the other end of the resistor R333 is respectively connected to the pin 2 of the amplifier U30A and one end of the resistor R322.
  • the other end of the resistor R322 is grounded.
  • Amplifier U30A pin 4 is connected to a 3.3V negative voltage source, and amplifier U30A pin 8 is connected to a 3.3V positive voltage source.
  • the other end of the resistor R338 is connected to one end of the capacitor C351.
  • the other end of the capacitor C351 is connected in parallel with one end of the resistor R337 and one end of the capacitor C352, respectively.
  • the other end of the capacitor C352 is connected in parallel with the pin 5 of the amplifier U30B and one end of the resistor R334 respectively.
  • the other end of the resistor R334 is grounded.
  • the other end of the resistor R337 is connected in parallel with one end of the resistor R336 and then connected to the pin 7 of the amplifier U30B.
  • the other end of the resistor R336 is connected in parallel with the pin 6 of the amplifier U30B and one end of the resistor R335 respectively.
  • the other end of the resistor R335 is grounded.
  • Amplifier U30B pin 4 is connected to a 3.3V negative voltage source, and amplifier U30B pin 8 is connected to a 3.3V positive voltage source.
  • the amplifying circuit includes two parts, the first part and the second part together constitute the amplifying circuit of the present invention.
  • the amplifier circuit is used to amplify the signal from the band-pass filter circuit and eliminate the negative part of the signal.
  • the pin 7 of the amplifier U20B is connected in parallel with one end of the resistor R201, the cathode of the diode D16 and the pin 2 of the amplifier U24A, respectively.
  • the other end of the resistor R201 is respectively connected to the anode of the diode D16, the pin 1 of the amplifier U24A, and the cathode of the diode D17.
  • One end of the resistor R203 is connected to pin 3 of the amplifier U24A, and the other end of the resistor R203 is grounded.
  • the amplifier U24A pin 4 is connected to a 3.3V negative voltage source
  • the amplifier U24A pin 8 is connected to a 3.3V positive voltage source.
  • pin 7 of amplifier U30B is connected in parallel with one end of resistor R301, the cathode of diode D36 and pin 2 of amplifier U34A, respectively.
  • the other end of the R301 resistor is connected to the anode of the diode D36, the pin 1 of the amplifier U34A, and the cathode of the diode D37, respectively.
  • One end of the resistor R303 is connected to pin 3 of the amplifier U34A, and the other end of the resistor R303 is grounded.
  • Pin 4 of the amplifier U34A is connected to a 3.3V negative voltage source, and pin 8 of the amplifier U34A is connected to a 3.3V positive voltage source.
  • the integration circuit includes two parts, the first part and the second part together constitute the integration circuit of the present invention.
  • one end of the resistor R202 is connected to the cathode of the diode D17 of the amplifier circuit.
  • the other end of the resistor R202 is respectively connected to the pin 6 of the amplifier U24B, one end of the resistor R245, one end of the capacitor C137 and the source of the n-channel MOSFET Q5.
  • the other end of the resistor R245 is connected in parallel with the other end of the capacitor C137, the pin 7 of the amplifier U24B, the test point P22, the drain of the n-channel MOSFET Q5, and the ANT_ADC_B port of the MCUU8, respectively.
  • the gate of the n-channel MOSFETQ5 is connected to one end of the resistor R205.
  • the other end of the resistor R205 is connected to the DIS_ADC_B port of MCUU8.
  • Pin 5 of amplifier U24B is connected to one end of resistor R204, and the other end of resistor R204 is grounded.
  • one end of the resistor R302 is connected to the cathode of the diode D37 of the amplifier circuit.
  • the other end of the resistor R302 is respectively connected to the pin 6 of the amplifier U34B, one end of the resistor R345, one end of the capacitor C337 and the source of the n-channel MOSFET Q8.
  • the other end of the resistor R345 is respectively connected to the other end of the capacitor C137, the pin 7 of the amplifier U34B, the test point P32, the drain of the n-channel MOSFETQ8 and the ANT_ADC_A port of the MCUU8.
  • the gate of the n-channel MOSFETQ8 is connected to one end of the R305 resistor.
  • the other end of the resistor R305 is connected to the DIS_ADC_A port of MCUU8.
  • Pin 5 of amplifier U34B is connected to one end of resistor R304.
  • the other end of the resistor R304 is grounded.
  • the tablet includes a coil selection circuit, an antenna matrix, a transmitting and receiving switch circuit, a receiving control circuit, a band-pass filter circuit, an amplifying circuit, and an integrating circuit.
  • the user holds the pen to freely write and draw pictures on the tablet.
  • the handwritten trace drawn by the user on the tablet can be collected and displayed on the computer screen.
  • the invention provides a wireless method for inputting handwriting into a computer.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Near-Field Transmission Systems (AREA)

Abstract

Disclosed is a wireless pressure-sensitive digitizer apparatus, comprising a digitizer and a stylus provided with a resonant circuit, wherein the digitizer comprises an MCU module for generating a rectangular wave signal and an antenna matrix; and the antenna matrix comprises a set of transverse annular coils extending transversely and a set of longitudinal annular coils extending longitudinally, and the transverse annular coils and the longitudinal annular coils are orthogonal to one another. The rectangular wave signal is input into the transverse annular coils and the longitudinal annular coils to generate electromagnetic waves, and the electromagnetic waves are transmitted to the resonant circuit for charging. After a period of time, the resonant circuit generates a corresponding resonant wave signal. The digitizer begins to receive, by means of the transverse annular coils and the longitudinal annular coils, the resonant wave signal generated by the resonant circuit, and processes the resonant wave signal, converts the handwriting of a user into horizontal and vertical coordinates and pressure values in the form of digital signals, and calculates, in conjunction with a curve fitting algorithm, the horizontal and vertical coordinate values of the tip of the stylus in the digitizer and a pressure value at the time of writing with the stylus. The wireless pressure-sensitive digitizer apparatus can not only ensure the positioning accuracy of a stylus, but can also reduce the manufacturing costs thereof.

Description

一种无线压敏数位板装置Wireless pressure sensitive digital board device 技术领域Technical field
本发明涉及数位板技术领域，特别是涉及一种无线压敏数位板装置。The invention relates to the technical field of digital tablets, in particular to a wireless pressure-sensitive digital tablet device.
背景技术Background technique
数位板是一种常用的基于电磁感应原理的人机接口设备。数位板具有精度高、对压力敏感等特点，广泛应用于计算机图形处理、游戏制作、数字签名等领域。一般情况下，用户可以使用与数位板配套的笔在数位板上书写、签名或画图。根据电磁感应原理，数位板可以捕捉笔的轨迹和笔在手写时对数位板的压力，得到相应的手写输入数据。然后将手写输入数据以数字信号的形式传输到计算机，计算机对数据进行处理并生成相应的笔迹到显示设备进行显示。The digital tablet is a commonly used human-machine interface device based on the principle of electromagnetic induction. The digital tablet has the characteristics of high precision and sensitivity to pressure, and is widely used in computer graphics processing, game production, digital signature and other fields. In general, users can write, sign or draw pictures on the tablet with the pen that comes with the tablet. According to the principle of electromagnetic induction, the tablet can capture the trajectory of the pen and the pressure of the pen on the tablet during handwriting to obtain the corresponding handwritten input data. Then the handwritten input data is transmitted to the computer in the form of a digital signal, and the computer processes the data and generates the corresponding handwriting to the display device for display.
数位板的工作原理如下：数位板的环形天线与笔的谐振电路能发出交变电磁场。当将笔置于数位板表面时，数位板的环形天线接收笔的电磁场。通过多点定位，数位板可以精确定位笔尖的位置。根据电磁感应原理，笔分为两种：有源笔和无源笔。带电池的有源笔可以自身产生电磁场，而不带电池的无源笔需要反射数位板所产生的电磁场。压力感应是由笔结构中可移动部分产生的，并通过电磁信号反馈到数位板上。The working principle of the tablet is as follows: The loop antenna of the tablet and the resonant circuit of the pen can emit alternating electromagnetic fields. When the pen is placed on the surface of the tablet, the loop antenna of the tablet receives the electromagnetic field of the pen. Through multi-point positioning, the tablet can accurately locate the position of the pen tip. According to the principle of electromagnetic induction, pens are divided into two types: active pens and passive pens. Active pens with batteries can generate electromagnetic fields by themselves, while passive pens without batteries need to reflect the electromagnetic fields generated by the tablet. Pressure induction is generated by the movable part of the pen structure and fed back to the tablet through electromagnetic signals.
对于目前的市场来说，既要保证笔的定位精度，又要降低制造成本，仍然是一个挑战。For the current market, it is still a challenge to not only ensure the positioning accuracy of the pen, but also reduce the manufacturing cost.
发明内容Summary of the invention
本发明的目的是提供一种无线压敏数位板装置，既能保证笔的定位精度，又能降低制造成本。The purpose of the present invention is to provide a wireless pressure-sensitive digital tablet device, which can not only ensure the positioning accuracy of the pen, but also reduce the manufacturing cost.
为实现上述目的，本发明提供了如下方案：In order to achieve the above objectives, the present invention provides the following solutions:
一种无线压敏数位板装置，包括数位板和笔；A wireless pressure-sensitive digital tablet device, including a digital tablet and a pen;
所述数位板包括MCU模块、线圈选择电路以及天线矩阵；所述笔上设有谐振电路；The digital tablet includes an MCU module, a coil selection circuit, and an antenna matrix; the pen is provided with a resonance circuit;
所述MCU模块包括MCU芯片和发射接收开关电路；所述MCU芯片集成有曲线拟合算法；所述MCU芯片用于产生矩形波信号；所述天线矩阵包括沿横向延伸的一组横向环形线圈和沿纵向延伸的一组纵向环形线圈，且所述横向环形线圈和所述纵向环形线圈相互正交；The MCU module includes an MCU chip and a transmitting and receiving switch circuit; the MCU chip is integrated with a curve fitting algorithm; the MCU chip is used to generate a rectangular wave signal; the antenna matrix includes a set of transverse loop coils and A group of longitudinal loop coils extending in the longitudinal direction, and the transverse loop coil and the longitudinal loop coil are orthogonal to each other;
所述MCU芯片分别与所述线圈选择电路和所述发射接收电路连接；所述天线矩阵分别与所述线圈选择电路和所述发射接收电路连接；The MCU chip is respectively connected to the coil selection circuit and the transmitting and receiving circuit; the antenna matrix is respectively connected to the coil selection circuit and the transmitting and receiving circuit;
所述MCU芯片用于控制所述线圈选择电路选择所述天线矩阵中的一个第一横向环形线圈或一个第一纵向环形线圈，并将所述第一横向环形线圈或所述第一纵向环形线圈与所述发射接收开关电路连接；所述MCU芯片还用于将所述矩形波信号通过所述发射接收开关电路传输至所述第一横向环形线圈或所述第一纵向环形线圈以产生相应的电磁波信号；其中，所述第一横向环形线圈或所述第一纵向环形线圈的工作模式为发射模式；The MCU chip is used to control the coil selection circuit to select a first transverse loop coil or a first longitudinal loop coil in the antenna matrix, and connect the first transverse loop coil or the first longitudinal loop coil Connected to the transmitting and receiving switch circuit; the MCU chip is also used to transmit the rectangular wave signal to the first transverse toroidal coil or the first longitudinal toroidal coil through the transmitting and receiving switch circuit to generate corresponding Electromagnetic wave signal; wherein, the working mode of the first transverse toroidal coil or the first longitudinal toroidal coil is the transmitting mode;
所述谐振电路用于当所述笔与所述天线矩阵之间的距离在设定阈值之内时，接收所述数位板产生的电磁波信号并根据所述电磁波信号产生感应电压，然后将所述感应电压转换成谐振波信号；The resonant circuit is used to receive the electromagnetic wave signal generated by the tablet and generate an induced voltage according to the electromagnetic wave signal when the distance between the pen and the antenna matrix is within a set threshold, and then the The induced voltage is converted into a resonance wave signal;
所述MCU芯片还用于控制所述线圈选择电路选择所述天线矩阵中的一个第二横向环形线圈或一个第二纵向环形线圈，并将所述第二横向环形线圈或所述第二纵向环形线圈与所述发射接收开关电路连接；其中，所述第二横向环形线圈或所述第二纵向环形线圈的工作模式为接收模式；The MCU chip is also used to control the coil selection circuit to select a second transverse loop coil or a second longitudinal loop coil in the antenna matrix, and connect the second transverse loop coil or the second longitudinal loop coil The coil is connected to the transmitting and receiving switch circuit; wherein, the working mode of the second horizontal toroidal coil or the second longitudinal toroidal coil is the receiving mode;
所述谐振电路还用于将所述谐振波信号发送至所述第二横向环形线圈或所述第二纵向环形线圈以产生电信号，并将所述电信号通过所述发射接收开关电路发送至所述MCU芯片；The resonant circuit is also used to send the resonant wave signal to the second transverse toroidal coil or the second longitudinal toroidal coil to generate an electrical signal, and to send the electrical signal to the transmitting and receiving switch circuit through the transmitting and receiving switch circuit The MCU chip;
所述MCU芯片还用于根据所述电信号以及集成的曲线拟合算法计算笔尖位于数位板的横纵坐标值和笔书写时的压力值。The MCU chip is also used to calculate the abscissa and ordinate values of the pen tip on the tablet and the pressure value of the pen when writing according to the electrical signal and the integrated curve fitting algorithm.
可选的，所述MCU模块还包括接收控制电路；所述线圈选择电路的ANTY端口与所述接收控制电路的第二百一十八电阻相连，所述线圈选择电路的ANTX端口与所述接收控制电路的第三百一十八电阻相连；所述接收控制电路的第二百五十四电阻、第二百一十七电阻分别与所述发射接收开关电路的DIS_SIGNAL_B端口连接；所述接收控制电路的第三百五十四电阻、第三百一十七电阻分别与所述发射接收开关电路的Optionally, the MCU module further includes a receiving control circuit; the ANTY port of the coil selection circuit is connected to the 218th resistor of the receiving control circuit, and the ANTX port of the coil selection circuit is connected to the receiving control circuit. The 318th resistor of the control circuit is connected; the 254th resistor and the 217th resistor of the receiving control circuit are respectively connected to the DIS_SIGNAL_B port of the transmitting and receiving switch circuit; the receiving control The three hundred and fifty-fourth resistor and the three-hundred seventeenth resistor of the circuit are respectively connected with those of the transmitting and receiving switch circuit.
DIS_SIGNAL_A端口连接；DIS_SIGNAL_A port connection;
所述接收控制电路与所述MCU芯片连接；所述接收控制电路用于接收所述MCU芯片的指令以控制所述天线矩阵中的环形线圈发送信号的 同时禁用接收功能。The receiving control circuit is connected to the MCU chip; the receiving control circuit is used to receive an instruction from the MCU chip to control the loop coil in the antenna matrix to send signals while disabling the receiving function.
可选的，所述MCU模块还包括信号处理单元；所述信号处理单元包括依次相连的带通滤波电路、放大电路、积分电路以及模数转换电路；其中，所述带通滤波电路与所述发射接收开关电路连接，所述模数转换电路与所述MCU芯片连接。Optionally, the MCU module further includes a signal processing unit; the signal processing unit includes a band-pass filter circuit, an amplifying circuit, an integration circuit, and an analog-to-digital conversion circuit that are sequentially connected; wherein, the band-pass filter circuit and the The transmitting and receiving switch circuit is connected, and the analog-to-digital conversion circuit is connected with the MCU chip.
可选的，所述天线矩阵包括24个横向环形线圈和16个纵向环形线圈；其中，每个所述横向环形线圈的输出端均与所述天线矩阵的ANT_GND_A端口相连，且每个所述横向环形线圈均与横向测试点相连；每个所述纵向环形线圈的输出端都与所述天线矩阵的ANT_GND_B端口连接，且每个所述纵向环形线圈均与纵向测试点相连；所述ANT_GND_A端口通过电阻与所述ANT_GND_B端口相连。Optionally, the antenna matrix includes 24 transverse loop coils and 16 longitudinal loop coils; wherein the output end of each transverse loop coil is connected to the ANT_GND_A port of the antenna matrix, and each transverse loop coil is connected to the ANT_GND_A port of the antenna matrix. The loop coils are all connected to the horizontal test point; the output end of each longitudinal loop coil is connected to the ANT_GND_B port of the antenna matrix, and each of the longitudinal loop coils is connected to the longitudinal test point; the ANT_GND_A port passes The resistor is connected to the ANT_GND_B port.
可选的，所述发射接收开关电路用于切换所述天线矩阵中环形线圈的发射模式和接收模式；所述发射接收开关电路包括第四芯片以及与所述第四芯片连接的外围电路；Optionally, the transmitting and receiving switch circuit is used to switch the transmitting mode and the receiving mode of the loop coil in the antenna matrix; the transmitting and receiving switch circuit includes a fourth chip and a peripheral circuit connected to the fourth chip;
所述第四芯片的第一引脚与所述MCU芯片的第十一引脚相连，所述第四芯片的第一引脚用于开启纵向环形线圈的发射模式；所述第四芯片的第二引脚与第十一电阻的一端相连，所述第十一电阻的另一端与所述MCU芯片的第十引脚相连；所述第四芯片的第三引脚用于将矩形波信号传输到所述线圈选择电路和所述天线矩阵的纵向环形线圈，所述第四芯片的第三引脚与第十二电容的一端连接，所述第十二电容的另一端分别与所述天线矩阵的纵向测试点、第二百四十电阻的一端和所述线圈选择电路的ANTY端口相连；所述第四芯片的第四引脚与所述MCU芯片的第四十二引脚对应的DIS_OPA_B端口相连，所述第四芯片的第四引脚用于开启纵向环形线圈的接收模式；所述第四芯片的第五引脚、第七引脚、第九引脚均接地；The first pin of the fourth chip is connected to the eleventh pin of the MCU chip, and the first pin of the fourth chip is used to turn on the transmission mode of the longitudinal loop coil; the first pin of the fourth chip The second pin is connected to one end of the eleventh resistor, and the other end of the eleventh resistor is connected to the tenth pin of the MCU chip; the third pin of the fourth chip is used to transmit a rectangular wave signal To the coil selection circuit and the longitudinal loop coil of the antenna matrix, the third pin of the fourth chip is connected to one end of the twelfth capacitor, and the other end of the twelfth capacitor is respectively connected to the antenna matrix The longitudinal test point, one end of the 240th resistor and the ANTY port of the coil selection circuit are connected; the fourth pin of the fourth chip is the DIS_OPA_B port corresponding to the 42nd pin of the MCU chip Connected, the fourth pin of the fourth chip is used to turn on the receiving mode of the longitudinal loop coil; the fifth pin, the seventh pin, and the ninth pin of the fourth chip are all grounded;
所述第四芯片的第十引脚与所述MCU芯片的第十二引脚相对应的DIS_OPA_A端口相连，所述第四芯片的第十引脚用于开启横向环形线圈的接收模式；所述第四芯片的第十一引脚连接所述第一百五十三电容的一端，所述第一百五十三电容的另一端与所述天线矩阵的横向测试点连接，所述第一百五十三电容用于将矩形波信号传输到所述线圈选择电路和所 述天线矩阵的横向环形线圈；所述第二百四十电阻的另一端连接所述线圈选择电路的ANTX端口；所述第四芯片的第十二引脚与第二百三十九电阻的一端相连，所述第二百三十九电阻的另一端与所述MCU芯片的第十引脚相连；所述第四芯片的的第十三引脚与所述MCU芯片的第十一引脚相连，所述第四芯片的第十三引脚用于开启横向环形线圈的发射模式；所述第四芯片的的第十四引脚分别与正电压源的一端和第十一电容器的一端并联，所述第十一电容器的另一端接地。The tenth pin of the fourth chip is connected to the DIS_OPA_A port corresponding to the twelfth pin of the MCU chip, and the tenth pin of the fourth chip is used to enable the receiving mode of the transverse loop coil; The eleventh pin of the fourth chip is connected to one end of the one hundred and fifty-third capacitor, and the other end of the one hundred and fifty-third capacitor is connected to the lateral test point of the antenna matrix. The fifty-three capacitor is used to transmit the rectangular wave signal to the coil selection circuit and the transverse loop coil of the antenna matrix; the other end of the two hundred and fortieth resistor is connected to the ANTX port of the coil selection circuit; The twelfth pin of the fourth chip is connected to one end of the two hundred and thirty-ninth resistor, and the other end of the two hundred and thirty-ninth resistor is connected to the tenth pin of the MCU chip; the fourth chip The thirteenth pin of the fourth chip is connected to the eleventh pin of the MCU chip, and the thirteenth pin of the fourth chip is used to turn on the transmission mode of the transverse loop coil; the tenth pin of the fourth chip The four pins are respectively connected in parallel with one end of the positive voltage source and one end of the eleventh capacitor, and the other end of the eleventh capacitor is grounded.
可选的，所述线圈选择电路包括第一组芯片和第二组芯片；所述第一组芯片包括第七芯片、第十芯片以及第十一芯片；所述第二组芯片包括第九芯片和第十二芯片；Optionally, the coil selection circuit includes a first set of chips and a second set of chips; the first set of chips includes a seventh chip, a tenth chip, and an eleventh chip; the second set of chips includes a ninth chip And the twelfth chip;
所述第七芯片、所述第十芯片以及所述第十一芯片分别与所述横向环形线圈连接；The seventh chip, the tenth chip, and the eleventh chip are respectively connected to the transverse loop coil;
所述第九芯片和所述第十二芯片分别与所述纵向环形线圈连接；The ninth chip and the twelfth chip are respectively connected to the longitudinal loop coil;
所述第七芯片、所述第十芯片以及所述第十一芯片的第六引脚与所述MCU芯片连接；所述第七芯片、所述第十芯片以及所述第十一芯片的第六引脚用于根据所述MCU芯片的指令选择与所述横向环形线圈连接的芯片；The seventh chip, the tenth chip, and the sixth pin of the eleventh chip are connected to the MCU chip; the seventh chip, the tenth chip, and the eleventh chip The six pins are used to select the chip connected to the transverse loop coil according to the instruction of the MCU chip;
所述第九芯片和所述第十二芯片的第六引脚与所述MCU芯片连接；所述第九芯片和所述第十二芯片的第六引脚用于根据所述MCU芯片的指令选择与所述纵向环形线圈连接的芯片。The sixth pin of the ninth chip and the twelfth chip is connected to the MCU chip; the sixth pin of the ninth chip and the twelfth chip is used for instructions from the MCU chip Select the chip connected to the longitudinal loop coil.
可选的，所述发射接收开关电路的第四芯片的第六引脚与所述带通滤波电路的DIS_SIGNAL_B端口相连，所述发射接收开关电路的第四芯片的第八引脚与所述带通滤波电路的DIS_SIGNAL_A端口相连；Optionally, the sixth pin of the fourth chip of the transmit-receive switch circuit is connected to the DIS_SIGNAL_B port of the band-pass filter circuit, and the eighth pin of the fourth chip of the transmit-receive switch circuit is connected to the band-pass filter circuit. Connect the DIS_SIGNAL_A port of the filter circuit;
所述MCU模块的接收控制电路的第二百一十电阻分别与所述带通滤波电路的第二百二十电阻、第三百二十电阻连接。The two hundred and tenth resistor of the receiving control circuit of the MCU module is respectively connected to the two hundred and twentieth resistor and the 320th resistor of the band-pass filter circuit.
可选的，所述MCU芯片用于根据脉冲宽度调制技术产生连续的矩形波信号。Optionally, the MCU chip is used to generate a continuous rectangular wave signal according to a pulse width modulation technique.
根据本发明提供的具体实施例，本发明公开了以下技术效果：According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:
本发明涉及一种计算机外围设备，特别涉及一种无线压敏数位板装置。该装置的主要功能是将手写笔迹转换为数字信号形式的横纵坐标和压 力值。通过相应的硬件和算法，可以在屏幕上显示用户在数位板上绘制的笔迹。这款无线压敏数位板装置用于绘画和手写识别领域，不仅能够保证笔的定位精度，又能降低制造成本。The invention relates to a computer peripheral device, in particular to a wireless pressure sensitive digital tablet device. The main function of the device is to convert the handwriting into the horizontal and vertical coordinates and pressure values in the form of digital signals. Through the corresponding hardware and algorithm, the handwriting drawn by the user on the tablet can be displayed on the screen. This wireless pressure-sensitive digital tablet device is used in the fields of painting and handwriting recognition, not only to ensure the positioning accuracy of the pen, but also to reduce manufacturing costs.
说明书附图Attached drawings
下面结合附图对本发明作进一步说明：The present invention will be further explained below in conjunction with the drawings:
图1为本发明无线压敏数位板装置的结构框图；Figure 1 is a structural block diagram of the wireless pressure sensitive digital tablet device of the present invention;
图2为本发明MCU芯片的结构示意图；Figure 2 is a schematic diagram of the structure of the MCU chip of the present invention;
图3为本发明天线矩阵的芯片结构图；Figure 3 is a chip structure diagram of the antenna matrix of the present invention;
图4为本发明发射接收开关电路的结构图；图4(a)为第四芯片的结构图，图4(b)为外围电路的结构图；Fig. 4 is a structural diagram of the transmitting and receiving switch circuit of the present invention; Fig. 4(a) is a structural diagram of a fourth chip, and Fig. 4(b) is a structural diagram of a peripheral circuit;
图5为本发明线圈选择电路的结构图；图5(a)为第一组芯片的结构图，图5(b)为第二组芯片的结构图；Figure 5 is a structural diagram of the coil selection circuit of the present invention; Figure 5 (a) is a structural diagram of the first group of chips, and Figure 5 (b) is a structural diagram of the second group of chips;
图6为本发明接收控制电路的结构图；图6(a)为接收控制电路第一部分的结构图，图6(b)为接收控制电路第二部分的结构图；Figure 6 is a structural diagram of the receiving control circuit of the present invention; Figure 6 (a) is a structural diagram of the first part of the receiving control circuit, and Figure 6 (b) is a structural diagram of the second part of the receiving control circuit;
图7为本发明带通滤波电路的结构图；图7(a)为带通滤波电路第一部分的结构图，图7(b)为带通滤波电路第二部分的结构图；Figure 7 is a structural diagram of the band-pass filter circuit of the present invention; Figure 7 (a) is a structural diagram of the first part of the band-pass filter circuit, and Figure 7 (b) is a structural diagram of the second part of the band-pass filter circuit;
图8为本发明放大电路的结构图；图8(a)为放大电路第一部分的结构图，图8(b)为放大电路第二部分的结构图；Fig. 8 is a structural diagram of the amplifying circuit of the present invention; Fig. 8(a) is a structural diagram of the first part of the amplifying circuit, and Fig. 8(b) is a structural diagram of the second part of the amplifying circuit;
图9为本发明积分电路的结构图；图9(a)为积分电路第一部分的结构图，图9(b)为积分电路第二部分的结构图。Fig. 9 is a structural diagram of the integrating circuit of the present invention; Fig. 9(a) is a structural diagram of the first part of the integrating circuit, and Fig. 9(b) is a structural diagram of the second part of the integrating circuit.
具体实施方式Detailed ways
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.
为使本发明的上述目的、特征和优点能够更加明显易懂，下面结合附图和具体实施方式对本发明作进一步详细的说明。In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
本发明提供了一种无线压敏数位板装置，其中“无线”一词指的是笔和数位板之间没有电线相连。“压敏”一词的意思是，数位板可以测量笔在书 写时的压力。在数位板上会使用曲线拟合算法来确定笔尖位于数位板的横纵坐标值和笔书写时的压力值。The present invention provides a wireless pressure-sensitive digital tablet device, in which the term "wireless" means that there is no wire connection between the pen and the digital tablet. The term “pressure sensitive” means that the tablet can measure the pressure of the pen while writing. A curve fitting algorithm is used on the tablet to determine the abscissa and ordinate values of the pen tip on the tablet and the pressure value of the pen when writing.
如图1所示，本发明提供的无线压敏数位板装置包括数位板和笔。As shown in Figure 1, the wireless pressure-sensitive tablet device provided by the present invention includes a tablet and a pen.
数位板包括MCU模块、线圈选择电路以及天线矩阵。The tablet includes MCU module, coil selection circuit and antenna matrix.
笔上设有谐振电路。There is a resonance circuit on the pen.
MCU模块包括MCU芯片、发射接收开关电路、接收控制电路以及信号处理单元；信号处理单元包括依次相连的带通滤波电路、放大电路、积分电路以及模数转换电路。其中，带通滤波电路主要与发射接收开关电路连接，模数转换电路与MCU芯片连接。接收控制电路分别与发射接收开关电路、天线矩阵以及MCU芯片连接。The MCU module includes an MCU chip, a transmitting and receiving switch circuit, a receiving control circuit, and a signal processing unit; the signal processing unit includes a band-pass filter circuit, an amplifying circuit, an integrating circuit, and an analog-to-digital conversion circuit connected in sequence. Among them, the band-pass filter circuit is mainly connected with the transmitting and receiving switch circuit, and the analog-to-digital conversion circuit is connected with the MCU chip. The receiving control circuit is respectively connected with the transmitting and receiving switch circuit, the antenna matrix and the MCU chip.
MCU芯片集成有曲线拟合算法；该曲线拟合算法可结合接收的数字信号来计算笔尖位于数位板的横纵坐标值和笔书写时的压力值。MCU芯片用于根据脉冲宽度调制技术产生连续的矩形波信号。The MCU chip integrates a curve fitting algorithm; the curve fitting algorithm can combine the received digital signal to calculate the horizontal and vertical coordinates of the pen tip on the tablet and the pressure value of the pen when writing. The MCU chip is used to generate a continuous rectangular wave signal according to the pulse width modulation technology.
天线矩阵包括多个环形线圈，具体包括沿横向延伸的一组横向环形线圈和沿纵向延伸的一组纵向环形线圈，且横向环形线圈和纵向环形线圈相互正交。The antenna matrix includes a plurality of loop coils, specifically including a set of transverse loop coils extending in the transverse direction and a set of longitudinal loop coils extending in the longitudinal direction, and the transverse loop coils and the longitudinal loop coils are orthogonal to each other.
MCU芯片分别与线圈选择电路和发射接收电路连接；天线矩阵分别与线圈选择电路和发射接收电路连接。The MCU chip is respectively connected with the coil selection circuit and the transmitting and receiving circuit; the antenna matrix is respectively connected with the coil selecting circuit and the transmitting and receiving circuit.
MCU芯片用于控制线圈选择电路选择天线矩阵中的一个第一横向环形线圈或一个第一纵向环形线圈，并将第一横向环形线圈或第一纵向环形线圈与发射接收开关电路连接；MCU芯片还用于将矩形波信号通过发射接收开关电路传输至第一横向环形线圈或第一纵向环形线圈以产生相应的电磁波信号；此时第一横向环形线圈或第一纵向环形线圈的工作模式为发射模式。The MCU chip is used to control the coil selection circuit to select a first transverse loop coil or a first longitudinal loop coil in the antenna matrix, and connect the first transverse loop coil or the first longitudinal loop coil to the transmitting and receiving switch circuit; the MCU chip also Used to transmit the rectangular wave signal to the first transverse loop coil or the first longitudinal loop coil through the transmitting and receiving switch circuit to generate the corresponding electromagnetic wave signal; at this time, the working mode of the first transverse loop coil or the first longitudinal loop coil is the transmitting mode .
谐振电路用于当笔与天线矩阵之间的距离在设定阈值之内时，接收数位板产生的电磁波信号并根据电磁波信号产生感应电压，然后将感应电压转换成谐振波信号。其中，感应电压转换成谐振波信号的过程为感应电压在笔与数位板之间的距离在设定阈值之内时产生的感应电流，然后感应电流在谐振电路中生成相应的谐振波信号。When the distance between the pen and the antenna matrix is within the set threshold, the resonance circuit is used to receive the electromagnetic wave signal generated by the tablet and generate an induced voltage according to the electromagnetic wave signal, and then convert the induced voltage into a resonance wave signal. The process of converting the induced voltage into a resonance wave signal is an induced current generated when the induced voltage is within a set threshold between the pen and the tablet, and then the induced current generates a corresponding resonance wave signal in the resonance circuit.
MCU芯片还用于控制线圈选择电路选择天线矩阵中的一个第二横向 环形线圈或一个第二纵向环形线圈，并将第二横向环形线圈或第二纵向环形线圈与发射接收开关电路连接；此时，第二横向环形线圈或第二纵向环形线圈的工作模式为接收模式。The MCU chip is also used to control the coil selection circuit to select a second transverse loop coil or a second longitudinal loop coil in the antenna matrix, and connect the second transverse loop coil or the second longitudinal loop coil to the transmitting and receiving switch circuit; , The working mode of the second transverse loop coil or the second longitudinal loop coil is the receiving mode.
谐振电路还用于将谐振波信号发送至第二横向环形线圈或第二纵向环形线圈以产生电信号，并将电信号通过发射接收开关电路发送至MCU芯片。The resonant circuit is also used to send the resonant wave signal to the second transverse loop coil or the second longitudinal loop coil to generate an electric signal, and send the electric signal to the MCU chip through the transmitting and receiving switch circuit.
MCU芯片还用于根据电信号以及集成的曲线拟合算法计算笔尖位于数位板的横纵坐标值和笔书写时的压力值。The MCU chip is also used to calculate the horizontal and vertical coordinates of the pen tip on the tablet and the pressure value of the pen when writing according to the electrical signal and the integrated curve fitting algorithm.
环形线圈的发射模式具体为：MCU芯片利用脉宽调制(PWM)技术产生矩形波信号A。MCU芯片控制线圈选择电路，选择天线矩阵在横纵方向上的一个横向环形线圈或一个纵向环形线圈，并将所选的环形线圈与发射接收开关电路连接；然后MCU芯片控制发射接收开关电路将矩形波信号A传输到所选择的环形线圈，所选择的环形线圈产生相应的电磁波B。如果笔靠近该环形线圈，笔上的谐振电路就接收电磁波B，并产生感应电压。由笔上的谐振电路中的感应电压产生的电流会在谐振电路中生成相应的谐振波信号C。环形线圈的接收模式具体为：MCU芯片控制线圈选择电路，选择天线矩阵在横纵方向上的一个横向环形线圈或一个纵向环形线圈。该环形线圈接收笔产生的谐振波信号C，然后产生电磁波信号D，并将电磁波信号D发送至发射接收开关电路以及由MCU芯片控制的接收控制电路，然后传输到带通滤波电路进行滤波。滤波后的信号E经放大电路放大。然后将放大后产生的信号F输入积分电路，然后积分后的信号G传输到数模转换电路并将其转换为相应的数字信号。最后数字信号传输到MCU芯片的数字信号处理部分。The transmission mode of the loop coil is specifically: the MCU chip uses pulse width modulation (PWM) technology to generate a rectangular wave signal A. The MCU chip controls the coil selection circuit, selects a transverse loop coil or a longitudinal loop coil in the horizontal and vertical directions of the antenna matrix, and connects the selected loop coil with the transmitting and receiving switch circuit; then the MCU chip controls the transmitting and receiving switch circuit to be rectangular The wave signal A is transmitted to the selected loop coil, and the selected loop coil generates the corresponding electromagnetic wave B. If the pen is close to the loop coil, the resonant circuit on the pen receives the electromagnetic wave B and generates an induced voltage. The current generated by the induced voltage in the resonant circuit on the pen generates a corresponding resonant wave signal C in the resonant circuit. The receiving mode of the loop coil is specifically: the MCU chip controls the coil selection circuit to select a horizontal loop coil or a vertical loop coil in the horizontal and vertical directions of the antenna matrix. The loop coil receives the resonant wave signal C generated by the pen, and then generates an electromagnetic wave signal D, and sends the electromagnetic wave signal D to the transmitting and receiving switch circuit and the receiving control circuit controlled by the MCU chip, and then transmits it to the band-pass filter circuit for filtering. The filtered signal E is amplified by the amplifier circuit. Then the amplified signal F is input to the integrating circuit, and then the integrated signal G is transmitted to the digital-to-analog conversion circuit and converted into a corresponding digital signal. Finally, the digital signal is transmitted to the digital signal processing part of the MCU chip.
笔尖位于数位板的纵坐标值和笔书写时的压力值的确定过程为：首先MCU芯片选择一个横向环形线圈进入发射模式，经过一段预设定的时间停止并切换至接收模式，然后记录由笔的谐振波转换得到的数字信号。依次遍历完全部的横向环形线圈后，MCU芯片比较全部记录的数字信号并找到最大值，最大值所代表的横向环形线圈A即为笔最接近的横向环形线圈。随后MCU芯片选定以该横向环形线圈A为中心向上下两边拓展预设定个数的横向环形线圈组B。MCU芯片选择横向环形线圈A进入发射 模式，经过一段预设定的时间停止并切换至选择横向环形线圈组B内的一个横向环形线圈进入接收模式并记录由笔的谐振波转换得到的数字信号。依次遍历完横向环形线圈组B内全部的横向环形线圈后，根据记录的数字信号，采用曲线拟合算法计算笔尖位于数位板的纵坐标值和笔书写时的压力值。The process of determining the vertical coordinate value of the pen tip on the tablet and the pressure value of the pen when writing is as follows: First, the MCU chip selects a transverse loop coil to enter the transmit mode, after a preset period of time, it stops and switches to the receiving mode, and then records the pen The digital signal obtained by the conversion of the resonant wave. After traversing all the transverse loop coils in turn, the MCU chip compares all recorded digital signals and finds the maximum value. The transverse loop coil A represented by the maximum value is the transverse loop coil closest to the pen. Then the MCU chip selects the horizontal toroidal coil group B with the horizontal toroidal coil A as the center and expands the preset number of horizontal toroidal coils up and down. The MCU chip selects the transverse loop coil A to enter the transmit mode, stops after a preset time and switches to select a transverse loop coil in the transverse loop coil group B to enter the receive mode and record the digital signal converted by the pen's resonance wave. After sequentially traversing all the transverse loop coils in the transverse loop coil group B, according to the recorded digital signal, a curve fitting algorithm is used to calculate the ordinate value of the pen tip on the tablet and the pressure value of the pen when writing.
同理，在选择纵向环形线圈时，笔尖位于数位板的横坐标值和笔书写时的压力值的确定过程为：首先MCU芯片选择一个纵向环形线圈进入发射模式，经过一段预设定的时间停止并切换至接收模式，然后记录由笔的谐振波转换得到的数字信号。依次遍历完全部的纵向环形线圈后，MCU芯片比较全部记录的数字信号并找到最大值，最大值所代表的纵向环形线圈C即为笔最接近的纵向环形线圈。随后MCU芯片选定以该纵向环形线圈C为中心向上下两边拓展预设定个数的纵向环形线圈组D。MCU芯片选择纵向环形线圈C进入发射模式，经过一段预设定的时间停止并切换至选择纵向环形线圈组D内的一个纵向环形线圈进入接收模式并记录由笔的谐振波转换得到的数字信号。依次遍历完纵向环形线圈组D内全部的纵向环形线圈后，根据记录的数字信号，采用曲线拟合算法计算笔尖位于数位板的横坐标值和笔书写时的压力值。In the same way, when selecting the longitudinal loop coil, the determination process of the abscissa value of the pen tip on the tablet and the pressure value of the pen when writing is as follows: First, the MCU chip selects a longitudinal loop coil to enter the transmit mode, and then stops after a preset period of time. And switch to the receiving mode, and then record the digital signal converted by the pen's resonance wave. After traversing all the longitudinal loop coils in turn, the MCU chip compares all recorded digital signals and finds the maximum value. The longitudinal loop coil C represented by the maximum value is the longitudinal loop coil closest to the pen. Subsequently, the MCU chip selects the longitudinal toroidal coil group D with the longitudinal toroidal coil C as the center and expands a preset number of up and down sides. The MCU chip selects the longitudinal loop coil C to enter the transmit mode, stops after a preset time and switches to select a longitudinal loop coil in the longitudinal loop coil group D to enter the receive mode and record the digital signal converted by the pen's resonance wave. After successively traversing all the longitudinal loop coils in the longitudinal loop coil group D, according to the recorded digital signal, a curve fitting algorithm is used to calculate the abscissa value of the pen tip on the tablet and the pressure value of the pen when writing.
根据以上两个步骤，笔尖位于数位板的横纵坐标值和笔书写时的压力值得以确定。According to the above two steps, the horizontal and vertical coordinates of the pen tip on the tablet and the pressure value of the pen when writing are determined.
图2为本发明MCU芯片的结构示意图。如图2所示，MCU芯片用第八芯片(芯片U8)表示，其型号为E103C8T6。Figure 2 is a schematic diagram of the structure of the MCU chip of the present invention. As shown in Figure 2, the MCU chip is represented by the eighth chip (chip U8), and its model is E103C8T6.
如图3所示。天线矩阵包括24个横向环形线圈和16个纵向环形线圈。As shown in Figure 3. The antenna matrix includes 24 transverse loop coils and 16 longitudinal loop coils.
横向环形线圈(X01、X02……X18……X24)的输出端分别与ANT_GND_A端口相连。在横向延伸的每个横向环形线圈都与一个横向测试点相连。纵向环形线圈(Y01、Y02……Y10……Y16)的输出端分别与ANT_GND_B端口连接。在纵向延伸的每个纵向环形线圈都与一个纵向测试点相连。电阻R247的一端与ANT_GND_A端口相连。电阻R247的另一端与ANT_GND_B端口相连。The output terminals of the transverse loop coils (X01, X02...X18...X24) are respectively connected to the ANT_GND_A port. Each transverse loop coil extending in the transverse direction is connected to a transverse test point. The output terminals of the longitudinal loop coils (Y01, Y02...Y10...Y16) are respectively connected to the ANT_GND_B port. Each longitudinal loop coil extending in the longitudinal direction is connected to a longitudinal test point. One end of the resistor R247 is connected to the ANT_GND_A port. The other end of the resistor R247 is connected to the ANT_GND_B port.
如图4所示，本发明提供的发射接收开关电路用于切换天线矩阵中环形线圈的发射模式和接收模式。发射接收开关电路包括第四芯片以及与第 四芯片连接的外围电路；该第四芯片用芯片U4表示，其型号为74HC125PW。As shown in FIG. 4, the transmitting and receiving switch circuit provided by the present invention is used to switch the transmitting mode and the receiving mode of the loop coil in the antenna matrix. The transmitting and receiving switch circuit includes a fourth chip and a peripheral circuit connected to the fourth chip; the fourth chip is represented by chip U4, and its model is 74HC125PW.
芯片U4的第一引脚1与MCU芯片的第十一引脚11相连，芯片U4的第一引脚1用于开启纵向环形线圈的发射模式。芯片U4的第二引脚2与第十一电阻R11的一端相连，第十一电阻R11的另一端与MCU芯片的第十引脚10相连。芯片U4的第三引脚3用于将矩形波信号A传输到线圈选择电路和天线矩阵的纵向环形线圈，芯片U4的第三引脚3连接到第十二电容C12的一端，第十二电容器C12的另一端与纵向测试点、第二百四十电阻R240的一端和线圈选择电路的ANTY端口相连。芯片U4的第四引脚4与MCU芯片的第四十二引脚42对应的DIS_OPA_B端口相连，芯片U4的第四引脚4用于开启纵向环形线圈的接收模式。芯片U4的第五引脚5接地，芯片U4的第六引脚6接在接收控制电路的DIS_SIGNAL_B端口上。芯片U4的第七引脚7接地，芯片U4的第八引脚8接在接收控制电路的DIS_SIGNAL_A端口上，U4芯片的第九引脚9接在地上。芯片U4的第十引脚10与MCU芯片的第十二引脚12相对应的DIS_OPA_A端口相连，芯片U4的第十引脚10用于开启横向环形线圈的接收模式。芯片U4的第十一引脚11连接第一百五十三电容C153的一端，第一百五十三电容C153的另一端连接横向测试点，芯片U4的第十一引脚11用于将矩形波信号A传输到线圈选择电路和天线矩阵的横向环形线圈。第二百四十电阻R240的另一端连接线圈选择电路的ANTX端口。芯片U4的第十二引脚12与第二百三十九电阻R239的一端相连，第二百三十九电阻R239的另一端与MCU芯片的第十引脚10相连。芯片U4的第十三引脚13与MCU芯片的第十引脚10相连，芯片U4的第十三引脚13用于开启横向环形线圈的发射模式。芯片U4的第十四引脚14分别与五伏正电压源的一端和第十一电容器C11的一端并联。第十一电容器C11的另一端接地。The first pin 1 of the chip U4 is connected to the eleventh pin 11 of the MCU chip, and the first pin 1 of the chip U4 is used to enable the transmission mode of the longitudinal loop coil. The second pin 2 of the chip U4 is connected to one end of the eleventh resistor R11, and the other end of the eleventh resistor R11 is connected to the tenth pin 10 of the MCU chip. The third pin 3 of the chip U4 is used to transmit the rectangular wave signal A to the coil selection circuit and the longitudinal loop coil of the antenna matrix. The third pin 3 of the chip U4 is connected to one end of the twelfth capacitor C12, the twelfth capacitor The other end of C12 is connected to the longitudinal test point, one end of the two hundred and fortieth resistor R240 and the ANTY port of the coil selection circuit. The fourth pin 4 of the chip U4 is connected to the DIS_OPA_B port corresponding to the 42nd pin 42 of the MCU chip, and the fourth pin 4 of the chip U4 is used to enable the receiving mode of the longitudinal loop coil. The fifth pin 5 of the chip U4 is grounded, and the sixth pin 6 of the chip U4 is connected to the DIS_SIGNAL_B port of the receiving control circuit. The seventh pin 7 of the chip U4 is grounded, the eighth pin 8 of the chip U4 is connected to the DIS_SIGNAL_A port of the receiving control circuit, and the ninth pin 9 of the U4 chip is connected to the ground. The tenth pin 10 of the chip U4 is connected to the DIS_OPA_A port corresponding to the twelfth pin 12 of the MCU chip, and the tenth pin 10 of the chip U4 is used to enable the receiving mode of the transverse loop coil. The eleventh pin 11 of the chip U4 is connected to one end of the 153rd capacitor C153, and the other end of the 153rd capacitor C153 is connected to the horizontal test point. The eleventh pin 11 of the chip U4 is used to connect the rectangular The wave signal A is transmitted to the coil selection circuit and the transverse loop coil of the antenna matrix. The other end of the two hundred and fortieth resistor R240 is connected to the ANTX port of the coil selection circuit. The twelfth pin 12 of the chip U4 is connected to one end of the two hundred and thirty-ninth resistor R239, and the other end of the two hundred and thirty-ninth resistor R239 is connected to the tenth pin 10 of the MCU chip. The thirteenth pin 13 of the chip U4 is connected to the tenth pin 10 of the MCU chip, and the thirteenth pin 13 of the chip U4 is used to enable the transmission mode of the transverse loop coil. The fourteenth pin 14 of the chip U4 is respectively connected in parallel with one end of the five-volt positive voltage source and one end of the eleventh capacitor C11. The other end of the eleventh capacitor C11 is grounded.
如图5所示，线圈选择电路的目的是由MCU芯片控制选择天线矩阵在横纵方向上的各一个环形线圈与发射接收开关电路连接。As shown in Figure 5, the purpose of the coil selection circuit is to control and select the loop coil of the antenna matrix in the horizontal and vertical directions by the MCU chip to connect to the transmitting and receiving switch circuit.
线圈选择电路包括第一组芯片和第二组芯片；第一组芯片包括第七芯片、第十芯片以及第十一芯片；第二组芯片包括第九芯片和第十二芯片。The coil selection circuit includes a first set of chips and a second set of chips; the first set of chips includes a seventh chip, a tenth chip, and an eleventh chip; the second set of chips includes a ninth chip and a twelfth chip.
第七芯片、第十芯片以及第十一芯片分别与横向环形线圈连接。The seventh chip, the tenth chip and the eleventh chip are respectively connected to the transverse loop coil.
第九芯片和第十二芯片分别与纵向环形线圈连接。The ninth chip and the twelfth chip are respectively connected to the longitudinal loop coil.
第七芯片、第十芯片以及第十一芯片的第六引脚与MCU芯片连接；第七芯片、第十芯片以及第十一芯片的第六引脚用于根据MCU芯片的指令选择与横向环形线圈连接的芯片。The sixth pin of the seventh chip, the tenth chip and the eleventh chip are connected to the MCU chip; the sixth pin of the seventh chip, the tenth chip and the eleventh chip are used to select and horizontally ring according to the instructions of the MCU chip The chip to which the coil is connected.
第九芯片和第十二芯片的第六引脚与MCU芯片连接；第九芯片和第十二芯片的第六引脚用于根据MCU芯片的指令选择与纵向环形线圈连接的芯片。The sixth pin of the ninth chip and the twelfth chip is connected to the MCU chip; the sixth pin of the ninth chip and the twelfth chip is used to select the chip connected to the longitudinal loop coil according to the instruction of the MCU chip.
下面具体来说，第七芯片用芯片U7表示，第九芯片用芯片U9表示，第十芯片用芯片U10表示，第十一芯片用芯片U11表示，第十二芯片用芯片U12表示。Specifically, the seventh chip is represented by chip U7, the ninth chip is represented by chip U9, the tenth chip is represented by chip U10, the eleventh chip is represented by chip U11, and the twelfth chip is represented by chip U12.
MCU芯片(芯片U8)产生的矩形波信号A，通过如图2所示的ANTX端口分别输入到芯片U7、芯片U10和芯片U11的引脚3(X口端)。通过如图2所示的ANTY端口分别输入到芯片U99和芯片U12的引脚3(X口端)。The rectangular wave signal A generated by the MCU chip (chip U8) is input to the pin 3 (X port terminal) of the chip U7, the chip U10 and the chip U11 through the ANTX port as shown in FIG. 2 respectively. Input to the pin 3 (X port end) of chip U99 and chip U12 through the ANTY port as shown in Figure 2.
对于芯片U7，其引脚13、引脚14、引脚15、引脚12、引脚1、引脚5、引脚2、引脚4所对应的X0～X7端口分别在X方向(横向)与天线矩阵中的环形线圈X03、环形线圈X02、环形线圈X01、环形线圈X04、环形线圈X08、环形线圈X05、环形线圈X07、环形线圈X06相连。芯片U7的引脚6对应的
Figure PCTCN2020082873-appb-000001
端口由MCU芯片的X_ADR_3端口控制，芯片U7的引脚6用于接收MCU芯片的指令，并根据MCU芯片的指令选择线圈选择电路中的芯片U7。芯片U7的引脚11、引脚10、引脚9对应的A端口、B端口、C端口用于选择芯片U7中X0～X7端口的其中一个，并由MCU芯片的X_ADR_0端口、X_ADR_1端口、X_ADR_2端口控制。芯片U7的引脚16对应的VDD端口分别与五伏正电压源的一端和电容器C31的一端并联，电容器C31的另一端接地。芯片U7的引脚7对应的VEE端口与五伏负电压源的一端和电容器C32的一端并联，电容器C32的另一端接地。 For chip U7, the X0～X7 ports corresponding to pin 13, pin 14, pin 15, pin 12, pin 1, pin 5, pin 2, and pin 4 are respectively in the X direction (horizontal) It is connected with loop coil X03, loop coil X02, loop coil X01, loop coil X04, loop coil X08, loop coil X05, loop coil X07, and loop coil X06 in the antenna matrix. Corresponding to pin 6 of chip U7
Figure PCTCN2020082873-appb-000001
The port is controlled by the X_ADR_3 port of the MCU chip. The pin 6 of the chip U7 is used to receive the instruction of the MCU chip and select the chip U7 in the coil selection circuit according to the instruction of the MCU chip. The pin 11, pin 10, and pin 9 of the chip U7 corresponding to the A port, B port, and C port are used to select one of the X0～X7 ports in the chip U7, and are determined by the X_ADR_0 port, X_ADR_1 port, and X_ADR_2 port of the MCU chip. Port control. The VDD port corresponding to the pin 16 of the chip U7 is respectively connected in parallel with one end of the five-volt positive voltage source and one end of the capacitor C31, and the other end of the capacitor C31 is grounded. The VEE port corresponding to pin 7 of the chip U7 is connected in parallel with one end of the five-volt negative voltage source and one end of the capacitor C32, and the other end of the capacitor C32 is grounded.
对于芯片U10，其引脚13、引脚14、引脚15、引脚12、引脚1、引脚5、引脚2、引脚4所对应的X0～X7端口分别在X方向(横向)与天 线矩阵中的环形线圈X11、环形线圈X10、环形线圈X09、环形线圈X12、环形线圈X16、环形线圈X13、环形线圈X15、环形线圈X14相连。芯片U10的引脚6对应的
Figure PCTCN2020082873-appb-000002
端口由MCU芯片的X_ADR_4端口控制，芯片U10的引脚6用于接收MCU芯片的指令，并根据MCU芯片的指令选择线圈选择电路中的芯片U10。芯片U10的引脚11、引脚10、引脚9对应的A端口、B端口、C端口用于芯片U10中X0～X7端口的其中一个，由MCU芯片的X_ADR_0端口、X_ADR_1端口、X_ADR_2端口控制。芯片U10的引脚16对应的VDD端口分别与五伏正电压源的一端和电容器C39的一端并联，电容器C39的另一端接地。芯片U10的引脚7对应的VEE端口分别与五伏负电压源的一端和电容器C40的一端并联，电容器C40的另一端接地。 For chip U10, the X0～X7 ports corresponding to pin 13, pin 14, pin 15, pin 12, pin 1, pin 5, pin 2, and pin 4 are respectively in the X direction (horizontal) It is connected with loop coil X11, loop coil X10, loop coil X09, loop coil X12, loop coil X16, loop coil X13, loop coil X15, and loop coil X14 in the antenna matrix. Corresponding to pin 6 of chip U10
Figure PCTCN2020082873-appb-000002
The port is controlled by the X_ADR_4 port of the MCU chip. The pin 6 of the chip U10 is used to receive the instruction of the MCU chip and select the chip U10 in the coil selection circuit according to the instruction of the MCU chip. The A, B, and C ports corresponding to pin 11, pin 10, and pin 9 of the chip U10 are used for one of the X0～X7 ports in the chip U10, which are controlled by the X_ADR_0 port, X_ADR_1 port, and X_ADR_2 port of the MCU chip . The VDD port corresponding to the pin 16 of the chip U10 is respectively connected in parallel with one end of the five-volt positive voltage source and one end of the capacitor C39, and the other end of the capacitor C39 is grounded. The VEE port corresponding to pin 7 of the chip U10 is respectively connected in parallel with one end of the five-volt negative voltage source and one end of the capacitor C40, and the other end of the capacitor C40 is grounded.
对于芯片U11，其引脚13、引脚14、引脚15、引脚12、引脚1、引脚5、引脚2、引脚4所对应的X0～X7端口分别在X方向(横向)与天线矩阵中的环形线圈X19、环形线圈X18、环形线圈X17、环形线圈X20、环形线圈X24、环形线圈X21、环形线圈X23、环形线圈X22相连。芯片U11的引脚6对应的
Figure PCTCN2020082873-appb-000003
端口由MCU芯片的X_ADR_5端口控制，芯片U11的引脚6用于接收MCU芯片的指令，并根据MCU芯片的指令选择线圈选择电路中的芯片U11。芯片U11的引脚11、引脚10、引脚9对应的A端口、B端口、C端口用于选择芯片U11中X0～X7端口的其中一个，由MCU芯片的X_ADR_0端口、X_ADR_1端口、X_ADR_2端口控制。芯片U11的引脚16对应的VDD端口分别与五伏正电压源的一端和电容器C47的一端并联，电容器C47的另一端接地。芯片U11的引脚7对应的VEE端口分别与五伏负电压源的一端和电容器C48的一端并联，电容器C48的另一端接地。 For chip U11, the X0～X7 ports corresponding to pin 13, pin 14, pin 15, pin 12, pin 1, pin 5, pin 2, and pin 4 are respectively in the X direction (horizontal) It is connected to the loop coil X19, loop coil X18, loop coil X17, loop coil X20, loop coil X24, loop coil X21, loop coil X23, and loop coil X22 in the antenna matrix. Corresponding to pin 6 of chip U11
Figure PCTCN2020082873-appb-000003
The port is controlled by the X_ADR_5 port of the MCU chip. The pin 6 of the chip U11 is used to receive the instruction of the MCU chip and select the chip U11 in the coil selection circuit according to the instruction of the MCU chip. The A, B, and C ports corresponding to pin 11, pin 10, and pin 9 of the chip U11 are used to select one of the X0～X7 ports in the chip U11, which is determined by the X_ADR_0 port, X_ADR_1 port, and X_ADR_2 port of the MCU chip. control. The VDD port corresponding to pin 16 of the chip U11 is respectively connected in parallel with one end of the five-volt positive voltage source and one end of the capacitor C47, and the other end of the capacitor C47 is grounded. The VEE port corresponding to pin 7 of the chip U11 is connected in parallel with one end of the five-volt negative voltage source and one end of the capacitor C48, and the other end of the capacitor C48 is grounded.
对于芯片U9，其引脚13、引脚14、引脚15、引脚12、引脚1、引脚5、引脚2、引脚4所对应的X0～X7端口分别在Y方向(纵向)与天线矩阵中的环形线圈Y03、环形线圈Y02、环形线圈Y01、环形线圈Y04、环形线圈Y08、环形线圈Y05、环形线圈Y07、环形线圈Y06连接。芯片U9的引脚6对应的
Figure PCTCN2020082873-appb-000004
端口由MCU芯片的Y_ADR_3端口控制，芯片U9的引脚6用于接收MCU芯片的指令，并根据MCU芯片的指令选 择线圈选择电路中的芯片U9。芯片U9的引脚11、引脚10、引脚9对应的A端口、B端口、C端口用于选择芯片U9中X0～X7端口的其中一个，由MCU芯片的Y_ADR_0端口、Y_ADR_1端口、Y_ADR_2端口控制。芯片U9的引脚16对应的VDD端口分别与五伏正电压源的一端和电容器C41的一端并联，电容器C41的另一端接地。芯片U9的引脚7对应的VEE形端口分别与五伏负电压源的一端和电容器C42的一端并联。电容器C42的另一端接地。 For chip U9, the X0～X7 ports corresponding to pin 13, pin 14, pin 15, pin 12, pin 1, pin 5, pin 2, and pin 4 are in the Y direction (vertical) respectively It is connected with loop coil Y03, loop coil Y02, loop coil Y01, loop coil Y04, loop coil Y08, loop coil Y05, loop coil Y07, and loop coil Y06 in the antenna matrix. Corresponding to pin 6 of chip U9
Figure PCTCN2020082873-appb-000004
The port is controlled by the Y_ADR_3 port of the MCU chip. The pin 6 of the chip U9 is used to receive the instruction of the MCU chip and select the chip U9 in the coil selection circuit according to the instruction of the MCU chip. The pin 11, pin 10, and pin 9 of the chip U9 corresponding to the A port, B port, and C port are used to select one of the X0～X7 ports in the chip U9, which is determined by the Y_ADR_0 port, Y_ADR_1 port, and Y_ADR_2 port of the MCU chip. control. The VDD port corresponding to the pin 16 of the chip U9 is respectively connected in parallel with one end of the five-volt positive voltage source and one end of the capacitor C41, and the other end of the capacitor C41 is grounded. The VEE-shaped port corresponding to pin 7 of the chip U9 is respectively connected in parallel with one end of the five-volt negative voltage source and one end of the capacitor C42. The other end of the capacitor C42 is grounded.
对于芯片U10，其引脚13、引脚14、引脚15、引脚12、引脚1、引脚5、引脚2、引脚4所对应的X0～X7端口分别在Y方向(纵向)与天线矩阵中的环形线圈Y11、环形线圈Y10、环形线圈Y09、环形线圈Y12、环形线圈Y16、环形线圈Y13、环形线圈Y15、环形线圈Y14相连。芯片U10的引脚6对应的
Figure PCTCN2020082873-appb-000005
端口由MCU芯片的Y_ADR_4端口控制，芯片U10的引脚6用于接收MCU芯片的指令，并根据MCU芯片的指令选择线圈选择电路中的芯片U10。芯片U10的引脚11、引脚10、引脚9对应的A端口、B端口、C端口用于选择芯片U10中X0～X7端口的其中一个，由MCU芯片的Y_ADR_0端口、Y_ADR_1端口、Y_ADR_2端口控制。芯片U10的引脚16对应的VDD端口分别与五伏正电压源的一端和电容器C49的一端并联，电容器C49的另一端接地。芯片U10的引脚7对应的VEE形端口分别与五伏负电压源的一端和电容器C50的一端并联，电容器C50的另一端接地。 For the chip U10, the X0～X7 ports corresponding to pin 13, pin 14, pin 15, pin 12, pin 1, pin 5, pin 2, and pin 4 are respectively in the Y direction (vertical) It is connected with loop coil Y11, loop coil Y10, loop coil Y09, loop coil Y12, loop coil Y16, loop coil Y13, loop coil Y15, and loop coil Y14 in the antenna matrix. Corresponding to pin 6 of chip U10
Figure PCTCN2020082873-appb-000005
The port is controlled by the Y_ADR_4 port of the MCU chip. The pin 6 of the chip U10 is used to receive the instruction of the MCU chip and select the chip U10 in the coil selection circuit according to the instruction of the MCU chip. The A, B, and C ports corresponding to pin 11, pin 10, and pin 9 of the chip U10 are used to select one of the X0～X7 ports in the chip U10, which is determined by the Y_ADR_0 port, Y_ADR_1 port, and Y_ADR_2 port of the MCU chip. control. The VDD port corresponding to the pin 16 of the chip U10 is respectively connected in parallel with one end of the five-volt positive voltage source and one end of the capacitor C49, and the other end of the capacitor C49 is grounded. The VEE-shaped port corresponding to pin 7 of the chip U10 is connected in parallel with one end of the five-volt negative voltage source and one end of the capacitor C50, and the other end of the capacitor C50 is grounded.
如图6所示，接收控制电路包括两个部分，第一部分和第二部分共同组成本发明的接收控制电路；该接收控制电路用于接收MCU芯片的指令以控制天线矩阵中的环形线圈发送信号的同时禁用接收功能。As shown in Figure 6, the receiving control circuit includes two parts. The first part and the second part together constitute the receiving control circuit of the present invention; the receiving control circuit is used to receive instructions from the MCU chip to control the loop coils in the antenna matrix to send signals. Disable the receiving function at the same time.
如图6(a)所述的第一部分，线圈选择电路的ANTY端口与接收控制电路的第二百一十八电阻(用电阻R218表示)的一端相连，电阻R218的另一端与电阻R230、第二百五十四电阻(用电阻R254表示)、电阻R206、电阻R223的一端相连。电阻R230的另一端连接模拟地，电阻R254的另一端连接发射接收开关电路的DIS_SIGNAL_B端口，电阻R206的另一端分别与电阻R219的一端和放大器U22A的引脚3并联，电阻R219的另一端与模拟地相连。电阻R223的另一端分别与电阻R207的一端、 放大器U22A的引脚1、第二百一十七电阻(电阻R217表示)的一端、电阻R210的一端并联。电阻R207的另一端分别与放大器U22A的引脚2和电阻R209的一端并联。电阻R209的另一端与电阻R208的一端连接，且电阻R209的另一端还连接模拟地。电阻R208的另一端与终端ANT_GND_B相连。电阻R217的另一端与发射接收开关电路的DIS_SIGNAL_B端口相连。电阻R210的另一端与带通滤波电路的电阻R220的一端连接。放大器U22A引脚4接3.3V负电压源，放大器U22A引脚8接3.3V正电压源。As shown in the first part of Figure 6(a), the ANTY port of the coil selection circuit is connected to one end of the 218th resistor (represented by the resistor R218) of the receiving control circuit, and the other end of the resistor R218 is connected to the resistor R230 and the first end of the resistor R218. One end of the 254 resistor (represented by the resistor R254), the resistor R206, and the resistor R223 are connected. The other end of the resistor R230 is connected to the analog ground, the other end of the resistor R254 is connected to the DIS_SIGNAL_B port of the transmitting and receiving switch circuit, the other end of the resistor R206 is connected in parallel with one end of the resistor R219 and the pin 3 of the amplifier U22A, and the other end of the resistor R219 is connected to the analog Connected to ground. The other end of the resistor R223 is respectively connected in parallel with one end of the resistor R207, the pin 1 of the amplifier U22A, one end of the 217th resistor (represented by the resistor R217), and one end of the resistor R210. The other end of the resistor R207 is connected in parallel with the pin 2 of the amplifier U22A and one end of the resistor R209 respectively. The other end of the resistor R209 is connected to one end of the resistor R208, and the other end of the resistor R209 is also connected to the analog ground. The other end of the resistor R208 is connected to the terminal ANT_GND_B. The other end of the resistor R217 is connected to the DIS_SIGNAL_B port of the transmitting and receiving switch circuit. The other end of the resistor R210 is connected to one end of the resistor R220 of the band-pass filter circuit. The amplifier U22A pin 4 is connected to a 3.3V negative voltage source, and the amplifier U22A pin 8 is connected to a 3.3V positive voltage source.
如图6(b)所述的第二部分，线圈选择电路的ANTX端口连接接收控制电路的第三百一十八电阻(电阻R318表示)的一端，电阻R318的另一端连接电阻R330、第三百五十四电阻(用电阻R354表示)、电阻R306、电阻R323的一端。电阻R330的另一端连接模拟地，电阻R354的另一端连接发射接收开关电路的DIS_SIGNAL_A端口。电阻R306的另一端分别与电阻R319的一端以及放大器U32A的引脚3并联。电阻R319的另一端连接模拟地。电阻R323的另一端分别与电阻R307的一端、放大器U32A的引脚1、第三百一十七电阻(用电阻R317表示)的一端、电阻R310的一端并联。电阻R307的另一端分别与放大器U32A的引脚2和电阻R309的一端并联。电阻R309的另一端连接电阻R308的一端，电阻R309的另一端还连接模拟地。电阻R308的另一端与ANT_GND_A端口相连。电阻R317的另一端与发射接收开关电路的DIS_SIGNAL_A端口相连。电阻R210的另一端与带通滤波电路的电阻R320的一端连接。放大器U32A引脚4接3.3V负电压源，放大器U32A引脚8接3.3V正电压源。As shown in the second part of Figure 6(b), the ANTX port of the coil selection circuit is connected to one end of the 318th resistor (represented by the resistor R318) of the receiving control circuit, and the other end of the resistor R318 is connected to the resistor R330 and the third resistor. One end of one hundred and fifty-four resistors (represented by resistor R354), resistor R306, and resistor R323. The other end of the resistor R330 is connected to the analog ground, and the other end of the resistor R354 is connected to the DIS_SIGNAL_A port of the transmitting and receiving switch circuit. The other end of the resistor R306 is respectively connected in parallel with one end of the resistor R319 and the pin 3 of the amplifier U32A. The other end of the resistor R319 is connected to the analog ground. The other end of the resistor R323 is connected in parallel with one end of the resistor R307, the pin 1 of the amplifier U32A, one end of the 317th resistor (represented by the resistor R317), and one end of the resistor R310, respectively. The other end of the resistor R307 is connected in parallel with the pin 2 of the amplifier U32A and one end of the resistor R309 respectively. The other end of the resistor R309 is connected to one end of the resistor R308, and the other end of the resistor R309 is also connected to the analog ground. The other end of the resistor R308 is connected to the ANT_GND_A port. The other end of the resistor R317 is connected to the DIS_SIGNAL_A port of the transmitting and receiving switch circuit. The other end of the resistor R210 is connected to one end of the resistor R320 of the band-pass filter circuit. The amplifier U32A pin 4 is connected to a 3.3V negative voltage source, and the amplifier U32A pin 8 is connected to a 3.3V positive voltage source.
如图7所示，带通滤波电路包括两个部分，第一部分和第二部分共同组成本发明的带通滤波电路。带通滤波电路是用来传递频率在450KHz和550KHz之间的信号。As shown in FIG. 7, the band-pass filter circuit includes two parts, the first part and the second part together constitute the band-pass filter circuit of the present invention. Band-pass filter circuit is used to pass signals with frequencies between 450KHz and 550KHz.
如图7(a)所述的第一部分，电阻R220的另一端分别与电阻R232的一端和电容C138的一端并联。电阻R232的另一端分别与放大器U20A的引脚3和电容器C175的一端并联。电容器C175的另一端接地。电容C138的另一端分别与放大器U20A的引脚1、电阻R238的一端和电阻 R233的一端连接。电阻R233的另一端分别与放大器U20A的引脚2和电阻R222的一端相连。电阻R222的另一端接地。放大器U20A引脚4接3.3V负电压源，放大器U20A引脚8接3.3V正电压源。电阻R238的另一端连接电容C151的一端。电容器C151的另一端分别与电阻R237的一端和电容器C152的一端并联。电容器C152的另一端分别与放大器U20B的引脚5和电阻R234的一端并联。电阻R234的另一端接地。电阻R237的另一端分别与电阻R236的一端和放大器U20B的引脚7并联。电阻R236的另一端分别与放大器U20B的引脚6和电阻R235的一端并联。电阻R235的另一端接地。放大器U20B引脚4接3.3V负电压源，放大器U20B引脚8接3.3V正电压源。As shown in the first part of Figure 7(a), the other end of the resistor R220 is connected in parallel with one end of the resistor R232 and one end of the capacitor C138, respectively. The other end of the resistor R232 is connected in parallel with the pin 3 of the amplifier U20A and one end of the capacitor C175 respectively. The other end of the capacitor C175 is grounded. The other end of the capacitor C138 is respectively connected to the pin 1, one end of the resistor R238 and one end of the resistor R233 of the amplifier U20A. The other end of the resistor R233 is respectively connected to the pin 2 of the amplifier U20A and one end of the resistor R222. The other end of the resistor R222 is grounded. The amplifier U20A pin 4 is connected to a 3.3V negative voltage source, and the amplifier U20A pin 8 is connected to a 3.3V positive voltage source. The other end of the resistor R238 is connected to one end of the capacitor C151. The other end of the capacitor C151 is connected in parallel with one end of the resistor R237 and one end of the capacitor C152, respectively. The other end of the capacitor C152 is connected in parallel with the pin 5 of the amplifier U20B and one end of the resistor R234 respectively. The other end of the resistor R234 is grounded. The other end of the resistor R237 is connected in parallel with one end of the resistor R236 and the pin 7 of the amplifier U20B respectively. The other end of the resistor R236 is connected in parallel with the pin 6 of the amplifier U20B and one end of the resistor R235 respectively. The other end of the resistor R235 is grounded. Amplifier U20B pin 4 is connected to a 3.3V negative voltage source, and amplifier U20B pin 8 is connected to a 3.3V positive voltage source.
如图7(b)所述的第二部分，电阻R320的另一端分别与电阻R332的一端和电容C338的一端并联。电阻R332的另一端分别与放大器U30A的引脚3和电容器C375的一端并联。电容器C375的另一端接地。电容C338的另一端分别与放大器U30A的引脚1、电阻R338的一端和电阻R333的一端连接。电阻R333的另一端分别与放大器U30A的引脚2和电阻R322的一端连接。电阻R322的另一端接地。放大器U30A引脚4接3.3V负电压源，放大器U30A引脚8接3.3V正电压源。电阻R338的另一端与电容器C351的一端相连。电容器C351的另一端分别与电阻R337的一端和电容器C352的一端并联。电容器C352的另一端分别与放大器U30B的引脚5和电阻R334的一端并联。电阻R334的另一端接地。电阻R337的另一端与电阻R336的一端并联后与放大器U30B的引脚7连接。电阻R336的另一端分别与放大器U30B的引脚6和电阻R335的一端并联。电阻R335的另一端接地。放大器U30B引脚4接3.3V负电压源，放大器U30B引脚8接3.3V正电压源。As shown in the second part of FIG. 7(b), the other end of the resistor R320 is connected in parallel with one end of the resistor R332 and one end of the capacitor C338, respectively. The other end of the resistor R332 is connected in parallel with the pin 3 of the amplifier U30A and one end of the capacitor C375 respectively. The other end of the capacitor C375 is grounded. The other end of the capacitor C338 is respectively connected to the pin 1, one end of the resistor R338 and one end of the resistor R333 of the amplifier U30A. The other end of the resistor R333 is respectively connected to the pin 2 of the amplifier U30A and one end of the resistor R322. The other end of the resistor R322 is grounded. Amplifier U30A pin 4 is connected to a 3.3V negative voltage source, and amplifier U30A pin 8 is connected to a 3.3V positive voltage source. The other end of the resistor R338 is connected to one end of the capacitor C351. The other end of the capacitor C351 is connected in parallel with one end of the resistor R337 and one end of the capacitor C352, respectively. The other end of the capacitor C352 is connected in parallel with the pin 5 of the amplifier U30B and one end of the resistor R334 respectively. The other end of the resistor R334 is grounded. The other end of the resistor R337 is connected in parallel with one end of the resistor R336 and then connected to the pin 7 of the amplifier U30B. The other end of the resistor R336 is connected in parallel with the pin 6 of the amplifier U30B and one end of the resistor R335 respectively. The other end of the resistor R335 is grounded. Amplifier U30B pin 4 is connected to a 3.3V negative voltage source, and amplifier U30B pin 8 is connected to a 3.3V positive voltage source.
如图8所示。放大电路包括两个部分，第一部分和第二部分共同组成本发明的放大电路。放大电路用来放大来自带通滤波电路的信号，并消除信号的负极部分。As shown in Figure 8. The amplifying circuit includes two parts, the first part and the second part together constitute the amplifying circuit of the present invention. The amplifier circuit is used to amplify the signal from the band-pass filter circuit and eliminate the negative part of the signal.
如图8(a)所述的第一部分，放大器U20B的引脚7分别与电阻R201的一端、二极管D16的阴极和放大器U24A的引脚2并联。电阻R201的另一端分别与二极管D16的阳极、放大器U24A的引脚1和二极管D17 的阴极连接。电阻R203的一端连接放大器U24A的引脚3，电阻R203的另一端接地。放大器U24A引脚4接3.3V负电压源，放大器U24A引脚8接3.3V正电压源。As shown in the first part of Fig. 8(a), the pin 7 of the amplifier U20B is connected in parallel with one end of the resistor R201, the cathode of the diode D16 and the pin 2 of the amplifier U24A, respectively. The other end of the resistor R201 is respectively connected to the anode of the diode D16, the pin 1 of the amplifier U24A, and the cathode of the diode D17. One end of the resistor R203 is connected to pin 3 of the amplifier U24A, and the other end of the resistor R203 is grounded. The amplifier U24A pin 4 is connected to a 3.3V negative voltage source, and the amplifier U24A pin 8 is connected to a 3.3V positive voltage source.
如图8(b)所述的第二部分，放大器U30B的引脚7分别与电阻R301的一端、二极管D36的阴极和放大器U34A的引脚2并联。R301电阻的另一端分别与二极管D36的阳极、放大器U34A的引脚1和二极管D37的阴极连接。电阻R303的一端连接放大器U34A的引脚3，电阻R303的另一端接地。放大器U34A的引脚4连接一个3.3V的负电压源，放大器U34A的引脚8连接一个3.3V的正电压源。As shown in the second part of Fig. 8(b), pin 7 of amplifier U30B is connected in parallel with one end of resistor R301, the cathode of diode D36 and pin 2 of amplifier U34A, respectively. The other end of the R301 resistor is connected to the anode of the diode D36, the pin 1 of the amplifier U34A, and the cathode of the diode D37, respectively. One end of the resistor R303 is connected to pin 3 of the amplifier U34A, and the other end of the resistor R303 is grounded. Pin 4 of the amplifier U34A is connected to a 3.3V negative voltage source, and pin 8 of the amplifier U34A is connected to a 3.3V positive voltage source.
如图9所示，积分电路包括两个部分，第一部分和第二部分共同组成本发明的积分电路。As shown in Fig. 9, the integration circuit includes two parts, the first part and the second part together constitute the integration circuit of the present invention.
如图9(a)所述的第一部分，电阻R202的一端与放大电路的二极管D17的阴极相连。电阻R202的另一端分别与放大器U24B的引脚6、电阻R245的一端、电容C137的一端和n通道MOSFETQ5的源极连接。电阻R245的另一端分别与电容C137的另一端、放大器U24B的引脚7、测试点P22、n通道MOSFETQ5的漏极、MCUU8的ANT_ADC_B端口并联。n通道MOSFETQ5的栅极与电阻R205的一端相连。电阻R205的另一端连接到MCUU8的DIS_ADC_B端口。放大器U24B的引脚5与电阻R204的一端相连，电阻R204的另一端接地。As shown in the first part of Figure 9(a), one end of the resistor R202 is connected to the cathode of the diode D17 of the amplifier circuit. The other end of the resistor R202 is respectively connected to the pin 6 of the amplifier U24B, one end of the resistor R245, one end of the capacitor C137 and the source of the n-channel MOSFET Q5. The other end of the resistor R245 is connected in parallel with the other end of the capacitor C137, the pin 7 of the amplifier U24B, the test point P22, the drain of the n-channel MOSFET Q5, and the ANT_ADC_B port of the MCUU8, respectively. The gate of the n-channel MOSFETQ5 is connected to one end of the resistor R205. The other end of the resistor R205 is connected to the DIS_ADC_B port of MCUU8. Pin 5 of amplifier U24B is connected to one end of resistor R204, and the other end of resistor R204 is grounded.
如图9(b)所述的第二部分，电阻R302的一端连接到放大电路的二极管D37的阴极上。电阻R302的另一端分别与放大器U34B的引脚6、电阻R345的一端、电容C337的一端和n通道MOSFETQ8的源极连接。电阻R345的另一端分别与电容器C137的另一端、放大器U34B的引脚7、测试点P32、n通道MOSFETQ8的漏极和MCUU8的ANT_ADC_A端口相连。n通道MOSFETQ8的栅极与R305电阻的一端相连。电阻R305的另一端连接到MCUU8的DIS_ADC_A端口。放大器U34B的引脚5与电阻R304的一端连接。电阻R304的另一端接地。As shown in the second part of Fig. 9(b), one end of the resistor R302 is connected to the cathode of the diode D37 of the amplifier circuit. The other end of the resistor R302 is respectively connected to the pin 6 of the amplifier U34B, one end of the resistor R345, one end of the capacitor C337 and the source of the n-channel MOSFET Q8. The other end of the resistor R345 is respectively connected to the other end of the capacitor C137, the pin 7 of the amplifier U34B, the test point P32, the drain of the n-channel MOSFETQ8 and the ANT_ADC_A port of the MCUU8. The gate of the n-channel MOSFETQ8 is connected to one end of the R305 resistor. The other end of the resistor R305 is connected to the DIS_ADC_A port of MCUU8. Pin 5 of amplifier U34B is connected to one end of resistor R304. The other end of the resistor R304 is grounded.
本发明所述的模数转换电路采用的现有技术中的电路，在此不再论述。The circuits in the prior art adopted by the analog-to-digital conversion circuit of the present invention will not be discussed here.
如上所述，根据本发明，该数位板包括线圈选择电路、天线矩阵、发 射接收开关电路、接收控制电路、带通滤波电路、放大电路和积分电路。在操作过程中，用户手持笔在写字板上自由书写、画图。借助数位板的硬件部分和曲线拟合算法，可以采集用户在数位板上绘制的手写轨迹并显示在电脑屏幕上。本发明提供一种将手写输入计算机的无线方法。As described above, according to the present invention, the tablet includes a coil selection circuit, an antenna matrix, a transmitting and receiving switch circuit, a receiving control circuit, a band-pass filter circuit, an amplifying circuit, and an integrating circuit. During the operation, the user holds the pen to freely write and draw pictures on the tablet. With the help of the hardware part of the tablet and the curve fitting algorithm, the handwritten trace drawn by the user on the tablet can be collected and displayed on the computer screen. The invention provides a wireless method for inputting handwriting into a computer.
本说明书中各个实施例采用递进的方式描述，每个实施例重点说明的都是与其他实施例的不同之处，各个实施例之间相同相似部分互相参见即可。The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referred to each other.
本文中应用了具体个例对本发明的原理及实施方式进行了阐述，以上实施例的说明只是用于帮助理解本发明的方法及其核心思想；同时，对于本领域的一般技术人员，依据本发明的思想，在具体实施方式及应用范围上均会有改变之处。综上所述，本说明书内容不应理解为对本发明的限制。Specific examples are used in this article to illustrate the principles and implementation of the present invention. The descriptions of the above examples are only used to help understand the methods and core ideas of the present invention; at the same time, for those of ordinary skill in the art, according to the present invention There will be changes in the specific implementation and scope of application. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims (8)

  1. 一种无线压敏数位板装置，其特征在于，包括数位板和笔；A wireless pressure-sensitive digital tablet device, characterized in that it comprises a digital tablet and a pen;
    所述数位板包括MCU模块、线圈选择电路以及天线矩阵；所述笔上设有谐振电路；The digital tablet includes an MCU module, a coil selection circuit, and an antenna matrix; the pen is provided with a resonance circuit;
    所述MCU模块包括MCU芯片和发射接收开关电路；所述MCU芯片集成有曲线拟合算法；所述MCU芯片用于产生矩形波信号；所述天线矩阵包括沿横向延伸的一组横向环形线圈和沿纵向延伸的一组纵向环形线圈，且所述横向环形线圈和所述纵向环形线圈相互正交；The MCU module includes an MCU chip and a transmitting and receiving switch circuit; the MCU chip is integrated with a curve fitting algorithm; the MCU chip is used to generate a rectangular wave signal; the antenna matrix includes a set of transverse loop coils and A group of longitudinal loop coils extending in the longitudinal direction, and the transverse loop coil and the longitudinal loop coil are orthogonal to each other;
    所述MCU芯片分别与所述线圈选择电路和所述发射接收电路连接；所述天线矩阵分别与所述线圈选择电路和所述发射接收电路连接；The MCU chip is respectively connected to the coil selection circuit and the transmitting and receiving circuit; the antenna matrix is respectively connected to the coil selection circuit and the transmitting and receiving circuit;
    所述MCU芯片用于控制所述线圈选择电路选择所述天线矩阵中的一个第一横向环形线圈或一个第一纵向环形线圈，并将所述第一横向环形线圈或所述第一纵向环形线圈与所述发射接收开关电路连接；所述MCU芯片还用于将所述矩形波信号通过所述发射接收开关电路传输至所述第一横向环形线圈或所述第一纵向环形线圈以产生相应的电磁波信号；其中，所述第一横向环形线圈或所述第一纵向环形线圈的工作模式为发射模式；The MCU chip is used to control the coil selection circuit to select a first transverse loop coil or a first longitudinal loop coil in the antenna matrix, and connect the first transverse loop coil or the first longitudinal loop coil Connected to the transmitting and receiving switch circuit; the MCU chip is also used to transmit the rectangular wave signal to the first transverse toroidal coil or the first longitudinal toroidal coil through the transmitting and receiving switch circuit to generate corresponding Electromagnetic wave signal; wherein, the working mode of the first transverse toroidal coil or the first longitudinal toroidal coil is the transmitting mode;
    所述谐振电路用于当所述笔与所述天线矩阵之间的距离在设定阈值之内时，接收所述数位板产生的电磁波信号并根据所述电磁波信号产生感应电压，然后将所述感应电压转换成谐振波信号；The resonant circuit is used to receive the electromagnetic wave signal generated by the tablet and generate an induced voltage according to the electromagnetic wave signal when the distance between the pen and the antenna matrix is within a set threshold, and then the The induced voltage is converted into a resonance wave signal;
    所述MCU芯片还用于控制所述线圈选择电路选择所述天线矩阵中的一个第二横向环形线圈或一个第二纵向环形线圈，并将所述第二横向环形线圈或所述第二纵向环形线圈与所述发射接收开关电路连接；其中，所述第二横向环形线圈或所述第二纵向环形线圈的工作模式为接收模式；The MCU chip is also used to control the coil selection circuit to select a second transverse loop coil or a second longitudinal loop coil in the antenna matrix, and connect the second transverse loop coil or the second longitudinal loop coil The coil is connected to the transmitting and receiving switch circuit; wherein, the working mode of the second horizontal toroidal coil or the second longitudinal toroidal coil is the receiving mode;
    所述谐振电路还用于将所述谐振波信号发送至所述第二横向环形线圈或所述第二纵向环形线圈以产生电信号，并将所述电信号通过所述发射接收开关电路发送至所述MCU芯片；The resonant circuit is also used to send the resonant wave signal to the second transverse toroidal coil or the second longitudinal toroidal coil to generate an electrical signal, and to send the electrical signal to the transmitting and receiving switch circuit through the transmitting and receiving switch circuit The MCU chip;
    所述MCU芯片还用于根据所述电信号以及集成的曲线拟合算法计算笔尖位于数位板的横纵坐标值和笔书写时的压力值。The MCU chip is also used to calculate the abscissa and ordinate values of the pen tip on the tablet and the pressure value of the pen when writing according to the electrical signal and the integrated curve fitting algorithm.
  2. 根据权利要求1所述的一种无线压敏数位板装置，其特征在于，所述MCU模块还包括接收控制电路；所述线圈选择电路的ANTY端口 与所述接收控制电路的第二百一十八电阻相连，所述线圈选择电路的ANTX端口与所述接收控制电路的第三百一十八电阻相连；所述接收控制电路的第二百五十四电阻、第二百一十七电阻分别与所述发射接收开关电路的DIS_SIGNAL_B端口连接；所述接收控制电路的第三百五十四电阻、第三百一十七电阻分别与所述发射接收开关电路的DIS_SIGNAL_A端口连接；The wireless pressure-sensitive digital tablet device according to claim 1, wherein the MCU module further comprises a receiving control circuit; the ANTY port of the coil selection circuit and the two hundred and tenth of the receiving control circuit Eight resistors are connected, the ANTX port of the coil selection circuit is connected to the 318th resistor of the receiving control circuit; the 254th resistor and the 217th resistor of the receiving control circuit are respectively Connected to the DIS_SIGNAL_B port of the transmitting and receiving switch circuit; the 354th resistor and the 317th resistor of the receiving control circuit are respectively connected to the DIS_SIGNAL_A port of the transmitting and receiving switch circuit;
    所述接收控制电路与所述MCU芯片连接；所述接收控制电路用于接收所述MCU芯片的指令以控制所述天线矩阵中的环形线圈发送信号的同时禁用接收功能。The receiving control circuit is connected to the MCU chip; the receiving control circuit is configured to receive instructions from the MCU chip to control the loop coil in the antenna matrix to send signals while disabling the receiving function.
  3. 根据权利要求1所述的一种无线压敏数位板装置，其特征在于，所述MCU模块还包括信号处理单元；所述信号处理单元包括依次相连的带通滤波电路、放大电路、积分电路以及模数转换电路；其中，所述带通滤波电路与所述发射接收开关电路连接，所述模数转换电路与所述MCU芯片连接。The wireless pressure-sensitive digital tablet device according to claim 1, wherein the MCU module further includes a signal processing unit; the signal processing unit includes a band-pass filter circuit, an amplifying circuit, an integrating circuit, and Analog-to-digital conversion circuit; wherein, the band-pass filter circuit is connected to the transmitting and receiving switch circuit, and the analog-to-digital conversion circuit is connected to the MCU chip.
  4. 根据权利要求1所述的一种无线压敏数位板装置，其特征在于，所述天线矩阵包括24个横向环形线圈和16个纵向环形线圈；其中，每个所述横向环形线圈的输出端均与所述天线矩阵的ANT_GND_A端口相连，且每个所述横向环形线圈均与横向测试点相连；每个所述纵向环形线圈的输出端都与所述天线矩阵的ANT_GND_B端口连接，且每个所述纵向环形线圈均与纵向测试点相连；所述ANT_GND_A端口通过电阻与所述ANT_GND_B端口相连。The wireless pressure-sensitive digital tablet device according to claim 1, wherein the antenna matrix includes 24 transverse loop coils and 16 longitudinal loop coils; wherein the output end of each of the transverse loop coils is Connected to the ANT_GND_A port of the antenna matrix, and each of the transverse loop coils is connected to a transverse test point; the output end of each longitudinal loop coil is connected to the ANT_GND_B port of the antenna matrix, and each of the transverse loop coils is connected to the ANT_GND_B port of the antenna matrix The longitudinal loop coils are all connected to the longitudinal test point; the ANT_GND_A port is connected to the ANT_GND_B port through a resistor.
  5. 根据权利要求1所述的一种无线压敏数位板装置，其特征在于，所述发射接收开关电路用于切换所述天线矩阵中环形线圈的发射模式和接收模式；所述发射接收开关电路包括第四芯片以及与所述第四芯片连接的外围电路；The wireless pressure-sensitive digital tablet device according to claim 1, wherein the transmitting and receiving switch circuit is used to switch the transmitting mode and the receiving mode of the loop coil in the antenna matrix; the transmitting and receiving switch circuit includes A fourth chip and a peripheral circuit connected to the fourth chip;
    所述第四芯片的第一引脚与所述MCU芯片的第十一引脚相连，所述第四芯片的第一引脚用于开启纵向环形线圈的发射模式；所述第四芯片的第二引脚与第十一电阻的一端相连，所述第十一电阻的另一端与所述MCU芯片的第十引脚相连；所述第四芯片的第三引脚用于将矩形波信号传输到所述线圈选择电路和所述天线矩阵的纵向环形线圈，所述第四芯片 的第三引脚与第十二电容的一端连接，所述第十二电容的另一端分别与所述天线矩阵的纵向测试点、第二百四十电阻的一端和所述线圈选择电路的ANTY端口相连；所述第四芯片的第四引脚与所述MCU芯片的第四十二引脚对应的DIS_OPA_B端口相连，所述第四芯片的第四引脚用于开启纵向环形线圈的接收模式；所述第四芯片的第五引脚、第七引脚、第九引脚均接地；The first pin of the fourth chip is connected to the eleventh pin of the MCU chip, and the first pin of the fourth chip is used to turn on the transmission mode of the longitudinal loop coil; the first pin of the fourth chip The second pin is connected to one end of the eleventh resistor, and the other end of the eleventh resistor is connected to the tenth pin of the MCU chip; the third pin of the fourth chip is used to transmit a rectangular wave signal To the coil selection circuit and the longitudinal loop coil of the antenna matrix, the third pin of the fourth chip is connected to one end of the twelfth capacitor, and the other end of the twelfth capacitor is respectively connected to the antenna matrix The longitudinal test point, one end of the 240th resistor and the ANTY port of the coil selection circuit are connected; the fourth pin of the fourth chip is the DIS_OPA_B port corresponding to the 42nd pin of the MCU chip Connected, the fourth pin of the fourth chip is used to turn on the receiving mode of the longitudinal loop coil; the fifth pin, the seventh pin, and the ninth pin of the fourth chip are all grounded;
    所述第四芯片的第十引脚与所述MCU芯片的第十二引脚相对应的DIS_OPA_A端口相连，所述第四芯片的第十引脚用于开启横向环形线圈的接收模式；所述第四芯片的第十一引脚连接所述第一百五十三电容的一端，所述第一百五十三电容的另一端与所述天线矩阵的横向测试点连接，所述第一百五十三电容用于将矩形波信号传输到所述线圈选择电路和所述天线矩阵的横向环形线圈；所述第二百四十电阻的另一端连接所述线圈选择电路的ANTX端口；所述第四芯片的第十二引脚与第二百三十九电阻的一端相连，所述第二百三十九电阻的另一端与所述MCU芯片的第十引脚相连；所述第四芯片的的第十三引脚与所述MCU芯片的第十一引脚相连，所述第四芯片的第十三引脚用于开启横向环形线圈的发射模式；所述第四芯片的的第十四引脚分别与正电压源的一端和第十一电容器的一端并联，所述第十一电容器的另一端接地。The tenth pin of the fourth chip is connected to the DIS_OPA_A port corresponding to the twelfth pin of the MCU chip, and the tenth pin of the fourth chip is used to enable the receiving mode of the transverse loop coil; The eleventh pin of the fourth chip is connected to one end of the one hundred and fifty-third capacitor, and the other end of the one hundred and fifty-third capacitor is connected to the lateral test point of the antenna matrix. The fifty-three capacitor is used to transmit the rectangular wave signal to the coil selection circuit and the transverse loop coil of the antenna matrix; the other end of the two hundred and fortieth resistor is connected to the ANTX port of the coil selection circuit; The twelfth pin of the fourth chip is connected to one end of the two hundred and thirty-ninth resistor, and the other end of the two hundred and thirty-ninth resistor is connected to the tenth pin of the MCU chip; the fourth chip The thirteenth pin of the fourth chip is connected to the eleventh pin of the MCU chip, and the thirteenth pin of the fourth chip is used to turn on the transmission mode of the transverse loop coil; the tenth pin of the fourth chip The four pins are respectively connected in parallel with one end of the positive voltage source and one end of the eleventh capacitor, and the other end of the eleventh capacitor is grounded.
  6. 根据权利要求1所述的一种无线压敏数位板装置，其特征在于，所述线圈选择电路包括第一组芯片和第二组芯片；所述第一组芯片包括第七芯片、第十芯片以及第十一芯片；所述第二组芯片包括第九芯片和第十二芯片；The wireless pressure-sensitive digital tablet device according to claim 1, wherein the coil selection circuit includes a first set of chips and a second set of chips; the first set of chips includes a seventh chip and a tenth chip And the eleventh chip; the second group of chips includes a ninth chip and a twelfth chip;
    所述第七芯片、所述第十芯片以及所述第十一芯片分别与所述横向环形线圈连接；The seventh chip, the tenth chip, and the eleventh chip are respectively connected to the transverse loop coil;
    所述第九芯片和所述第十二芯片分别与所述纵向环形线圈连接；The ninth chip and the twelfth chip are respectively connected to the longitudinal loop coil;
    所述第七芯片、所述第十芯片以及所述第十一芯片的第六引脚与所述MCU芯片连接；所述第七芯片、所述第十芯片以及所述第十一芯片的第六引脚用于根据所述MCU芯片的指令选择与所述横向环形线圈连接的芯片；The seventh chip, the tenth chip, and the sixth pin of the eleventh chip are connected to the MCU chip; the seventh chip, the tenth chip, and the eleventh chip The six pins are used to select the chip connected to the transverse loop coil according to the instruction of the MCU chip;
    所述第九芯片和所述第十二芯片的第六引脚与所述MCU芯片连接； 所述第九芯片和所述第十二芯片的第六引脚用于根据所述MCU芯片的指令选择与所述纵向环形线圈连接的芯片。The sixth pin of the ninth chip and the twelfth chip is connected to the MCU chip; the sixth pin of the ninth chip and the twelfth chip is used to follow the instructions of the MCU chip Select the chip connected to the longitudinal loop coil.
  7. 根据权利要求3所述的一种无线压敏数位板装置，其特征在于，所述发射接收开关电路的第四芯片的第六引脚与所述带通滤波电路的DIS_SIGNAL_B端口相连，所述发射接收开关电路的第四芯片的第八引脚与所述带通滤波电路的DIS_SIGNAL_A端口相连；The wireless pressure-sensitive digital tablet device according to claim 3, wherein the sixth pin of the fourth chip of the transmitting and receiving switch circuit is connected to the DIS_SIGNAL_B port of the band-pass filter circuit, and the transmitting The eighth pin of the fourth chip of the receiving switch circuit is connected to the DIS_SIGNAL_A port of the band-pass filter circuit;
    所述MCU模块的接收控制电路的第二百一十电阻分别与所述带通滤波电路的第二百二十电阻、第三百二十电阻连接。The two hundred and tenth resistor of the receiving control circuit of the MCU module is respectively connected to the two hundred and twentieth resistor and the 320th resistor of the band-pass filter circuit.
  8. 根据权利要求3所述的一种无线压敏数位板装置，其特征在于，所述MCU芯片用于根据脉冲宽度调制技术产生连续的矩形波信号。The wireless pressure-sensitive digital tablet device according to claim 3, wherein the MCU chip is used to generate a continuous rectangular wave signal according to a pulse width modulation technique.
PCT/CN2020/082873 2020-04-02 2020-04-02 Wireless pressure-sensitive digitizer apparatus WO2021196104A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/CN2020/082873 WO2021196104A1 (en) 2020-04-02 2020-04-02 Wireless pressure-sensitive digitizer apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2020/082873 WO2021196104A1 (en) 2020-04-02 2020-04-02 Wireless pressure-sensitive digitizer apparatus

Publications (1)

Publication Number Publication Date
WO2021196104A1 true WO2021196104A1 (en) 2021-10-07

Family

ID=77927309

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2020/082873 WO2021196104A1 (en) 2020-04-02 2020-04-02 Wireless pressure-sensitive digitizer apparatus

Country Status (1)

Country Link
WO (1) WO2021196104A1 (en)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102064381A (en) * 2010-11-23 2011-05-18 汉王科技股份有限公司 Induction antenna, electromagnetic handwriting device and antenna plate thereof
CN102184068A (en) * 2011-05-23 2011-09-14 刘平 Digitizer system with pen touch pressure induction function
US20110308867A1 (en) * 2010-06-21 2011-12-22 Waltop International Corporation Handwriting input device with electromagnetic power transmitting
CN103092410A (en) * 2012-12-28 2013-05-08 深圳市友基科技发展有限公司 Digital panel device
CN104598048A (en) * 2013-10-31 2015-05-06 鸿富锦精密工业（深圳）有限公司 Digital pen writing control method and system
CN109445641A (en) * 2018-12-19 2019-03-08 四川仪岛科技有限公司 A kind of writing position detector
CN110780757A (en) * 2019-12-04 2020-02-11 深圳市品致信息科技有限公司 Wireless pressure-sensitive digital panel device

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110308867A1 (en) * 2010-06-21 2011-12-22 Waltop International Corporation Handwriting input device with electromagnetic power transmitting
CN102064381A (en) * 2010-11-23 2011-05-18 汉王科技股份有限公司 Induction antenna, electromagnetic handwriting device and antenna plate thereof
CN102184068A (en) * 2011-05-23 2011-09-14 刘平 Digitizer system with pen touch pressure induction function
CN103092410A (en) * 2012-12-28 2013-05-08 深圳市友基科技发展有限公司 Digital panel device
CN104598048A (en) * 2013-10-31 2015-05-06 鸿富锦精密工业（深圳）有限公司 Digital pen writing control method and system
CN109445641A (en) * 2018-12-19 2019-03-08 四川仪岛科技有限公司 A kind of writing position detector
CN110780757A (en) * 2019-12-04 2020-02-11 深圳市品致信息科技有限公司 Wireless pressure-sensitive digital panel device

Similar Documents

Publication Publication Date Title
US8558810B2 (en) Touch mouse
CN102508575B (en) Screen writing device, screen writing system and realization method thereof
CN103969560A (en) Visual ultrasonic detection system for partial discharge failure detection
US8400877B2 (en) Method and apparatus for measuring position of the object using microphone
CN105222789A (en) A kind of building indoor plane figure method for building up based on laser range sensor
CN108399813B (en) Robot-based learning tutoring method and system, robot and handwriting equipment
CN111381209A (en) Distance measurement positioning method and device
CN103427905B (en) A kind of ultra-wideband radio over fiber positioning system
CN109743505A (en) Video capture method, apparatus and electronic equipment based on laser ranging
WO2021196104A1 (en) Wireless pressure-sensitive digitizer apparatus
CN103969561A (en) Visual ultrasonic detection method for partial discharge failure detection
CN112230107A (en) Partial discharge monitoring and positioning device, method, computer equipment and storage medium
CN103217120B (en) A kind of thickness measurement with laser method and device
CN107463288B (en) Digital input system and implementation method
CN110780757A (en) Wireless pressure-sensitive digital panel device
CN211506428U (en) Wireless pressure-sensitive digital panel device
TWI553530B (en) Touch control device, wireless touch control system, and touching control method thereof
CN203414589U (en) Mutual positioning and confirmation device between robots
CN108957464B (en) Four-lattice fish finding sonar
CN110972000A (en) Microphone array signal noise reduction system and microphone array optimization method
CN117480408A (en) Object ranging method and device
CN107247424B (en) A kind of method of switching of the AR virtual switch based on laser distance sensor
CN115328115A (en) Internet of things joint positioning method and application
CN110716642B (en) Method and equipment for adjusting display interface
CN105653025A (en) Information processing method and electronic equipment

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 20928906

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 20928906

Country of ref document: EP

Kind code of ref document: A1