CN1313912C - Radio active hand writing board for computer inputting - Google Patents
Radio active hand writing board for computer inputting Download PDFInfo
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- CN1313912C CN1313912C CNB2004100090150A CN200410009015A CN1313912C CN 1313912 C CN1313912 C CN 1313912C CN B2004100090150 A CNB2004100090150 A CN B2004100090150A CN 200410009015 A CN200410009015 A CN 200410009015A CN 1313912 C CN1313912 C CN 1313912C
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Abstract
The present invention relates to a wireless active handwriting board for computer input. Handwriting traces can be converted into digital quantity of an X and a Y coordinates by the present invention, and then, the handwriting traces are input into a computer, and the handwriting traces drawn on a handwriting board can be directly displayed on the screen of the computer by matching with a corresponding driver and application software. The present invention is characterized in that the receiving end of a receiving circuit is connected with an induction circuit composed of the receiving array of a coil in the X direction and a coil in the Y direction, the output end of the receiving circuit is provided with an amplifying circuit and a filter circuit respectively used for amplifying and filtering signals, and then a frequency detecting circuit and an amplitude detecting circuit are coupled in the present invention, the frequency and the amplitude detecting circuits are respectively used for detecting the frequency and the amplitude of the signals, and after the signals are output from the frequency and amplitude detecting circuits, a main processing CPU is coupled in the present invention; the present invention is provided with a wired charging circuit and a charging interface, a handwriting pen is provided with a charging electrode, and an energy storing device is adopted for supplying energy to the present invention.
Description
Technical field
The invention belongs to computer peripheral, its major function is that handwriting tracks is changed into digital quantity---X, Y coordinate, import computing machine then, cooperate corresponding driving program and application software, can directly be reflected in the user on the screen of computing machine at track drawn on the handwriting pad.The main application fields of handwriting pad is aspect hand-written discrimination system and drawing.
Background technology
The handwriting pad hardware vendor has the WACOM of Japan now, the Chinese princes and dukes department of the AIPTEK in Taiwan and China etc.Through years of development, it is ripe that the technology of handwriting pad has become, kind has also increased a lot, as wired handwriting pad, wireless handwriting pad, wired pressure sensitivity handwriting pad, wireless pressure sensitivity handwriting pad etc. has all been sold fast on market, and these handwriting pads also can be divided into electromagnetic type, touch, ultrasonic locating formula, photo-electric etc. on the principle.At present, the company that produces wireless handwriting pad in the world mainly is the AIPTEK company of TaiWan, China, the WACOM company of Japan and the Chinese princes and dukes department of China's Mainland.AIPTEK company mainly produces the wireless active handwriting pad, and its writing pencil all adopts the powered battery mode.WACOM company mainly produces the wireless and passive handwriting pad.The writing pencil of wireless active handwriting pad of the present invention uses energy storage device that energy is provided, both solve traditional wireless active handwriting pad and must use the drawback of battery-powered, and the higher signal of energy launch mass, overcome the low problem of wireless and passive handwriting pad capacity usage ratio.
Summary of the invention
The present invention also is a kind of wireless, active, handwriting pad that pressure is arranged.Wireless referring between writing pencil and the handwriting pad do not have line to be connected.Active referring to adopts energy storage device to provide the energy for writing pencil.There is pressure to refer to the pressure size that handwriting pad can the perception pen.The technical essential that handwriting pad measured X of the present invention, Y coordinate and pen are pressed is as shown in Figure 1: by the continuous sine wave of the emission of the resonant circuit in the writing pencil, receiving circuit on the handwriting pad receives sine wave signal, amplify through amplifying circuit, undesired signal is removed in filtering, insert frequency detection circuit and amplitude detection circuit then respectively, carry out frequency and amplitude and detect; Handle host CPU through A/D conversion input after amplitude detects, realize the measurement function of X, Y coordinate, the mechanism controls by interrelating with hand-written nib can change the parameter of writing pencil interior resonance circuit, and then change the wave frequency of writing pencil emission; Frequency detection circuit on the handwriting pad is handled host CPU with detected frequency change input, is converted into the variation of hand-written nib pressure, thereby finishes the measurement that pen is pressed.
In order the energy storage device in the writing pencil to be charged easily, in handwriting pad, designed corresponding wired charging circuit and charging inlet, installed charging electrode on the writing pencil.
Description of drawings
Fig. 1 is the wireless active handwriting pad system chart that is used for the computing machine typing.
Fig. 2 is the electromagnetic wave waveform of writing pencil emission of the present invention.
Fig. 3 is writing pencil of the present invention shunt-resonant circuit.
Fig. 4 is a receiving circuit of the present invention.
Fig. 5 is an amplifying circuit of the present invention.
Fig. 6 is an automatic gain control circuit of the present invention.
Fig. 7 is a filtering circuit of the present invention.
Fig. 8 is an amplitude detection circuit of the present invention.
Fig. 9 is a frequency detection circuit of the present invention.
Figure 10 is a charging circuit in the handwriting pad of the present invention.
Figure 11 is a charging inlet of the present invention.
Embodiment
Below in conjunction with drawings and Examples the present invention is further specified.
The present invention is made up of writing pencil and handwriting pad, does not have line between writing pencil and the handwriting pad, provides energy by energy storage device (present embodiment employing large bulk capacitance) in the writing pencil, the size of the pressure that handwriting pad can the perception pen.Hardware in the handwriting pad is by receiving circuit, amplifies, filtering circuit, and amplitude, frequency detection circuit and writing pencil charging circuit constitute; Connected mode between the foregoing circuit is as follows: the receiving end of receiving circuit receive by X1, X2 ... X22 and Y1, Y2 ... the loop inductance that the receiving array that Y18 constitutes is formed, the input IN end of the output termination amplifying circuit of receiving circuit, the input IN end of the output OUT termination filtering circuit of amplifying circuit, the output OUT termination amplitude of filtering circuit, the input IN of frequency detection circuit end, the output OUT termination of amplitude, frequency detection circuit goes into to handle host CPU.
The electromagnetic wave waveform of writing pencil of the present invention emission as shown in Figure 2, its frequency under the zero pressure state is 455KHz.Along with the increase of pressure, frequency reduces gradually.
The shunt-resonant circuit that the writing pencil circuit mainly is made up of electric capacity, inductance, its circuit connecting mode be as shown in Figure 3: switch S 1, S2 respectively behind series capacitance C3, the C4 its two ends in parallel with variable inductance L1 and capacitor C 1; One end of resistance R 1 links to each other with an end of capacitor C 2, capacitor C 5 respectively, and the other end links to each other with an end of capacitor C 6, resistance R 2 and the base stage of triode Q1 respectively; The collector of Q1 links to each other with the end of switch S 1, S2 respectively; One end of capacitor C 7 links to each other with the collector of Q1; Resistance R 4, capacitor C 8 backs in parallel one end ground connection, the other end links to each other with the end of C7, R3 respectively; The other end of R3 links to each other with the emitter of Q1; The other end of R2, C6, C5, C2 is ground connection respectively; Wherein switch S 1, S2 are the side switch of writing pencil, and its effect is equivalent to the left-right key of mouse.
Receiving circuit of the present invention is as shown in Figure 4: receiving circuit comprises directions X receiving loop and Y direction receiving loop, by order gating receiving circuit X1, X2 ... X18 ... X22 or Y1, Y2 ... Y18, can judge the position of writing pencil in X, Y coil according to the size of receiving signal, be writing pencil in the scope of which X or Y coil, and then judge the position of writing pencil in X or Y coil; Its concrete connection is: receiving loop is X, Y direction, and L11, L12, L13, L14, L15 are chip, and wherein L15, L14, L13 are used for realizing the directions X receiving function, and L11, L12 are used for realizing Y direction receiving function; The VEE termination ground voltage of L11, L12, L13, L14, L15; The X0 of L15, L14 chip ~ X7 port and L13 chip X2 ~ X7 port connect the directions X coil respectively; The X0 of L11, L12 chip ~ X7 port and L13 chip X0 ~ X1 port connect Y direction coil respectively, and the output terminal of these coils is ground connection all; The INH end is the sheet choosing, and the INH end of L11, L12, L13, L14, L15 chip inserts respectively handles host CPU; A end B end C end is a coil gating end, and A, B, the C gating end of L11, L12, L13, L14, L15 chip are public, and unified the access handled host CPU; The X end of L11, L12, L13, L14, L15 chip is an output received signal after output port 3 links to each other.
Amplifying circuit of the present invention as shown in Figure 5, received signal is carried out level Four by integrated transporting discharging and is amplified from IN end input, the influence of DC component and low-frequency disturbance is eliminated in the high-pass filtering by being undertaken by resistance-capacitance network for twice therebetween.Its concrete circuit connecting relation is: received signal is held the in-phase input end that is input to amplifier Amp1, ground connection behind the inverting input resistance in series R1 of Amp1 from IN; The two ends of resistance R 2 link to each other with output terminal with the inverting input of Amp1 respectively; The output terminal of Amp1 inserts the in-phase input end of amplifier Amp2 through capacitor C 1 back; One end ground connection of resistance R 3, the other end inserts the in-phase input end of Amp2; Ground connection behind the inverting input resistance in series R4 of Amp2; The two ends of resistance R 5 link to each other with output terminal with the inverting input of Amp2 respectively; The output terminal of Amp2 connects the in-phase input end of amplifier Amp3; Ground connection behind the inverting input resistance in series R6 of Amp3; The two ends of resistance R 7 link to each other with output terminal with the inverting input of Amp3 respectively; The output terminal of Amp3 inserts the in-phase input end of amplifier Amp4 through capacitor C 2 backs; One end ground connection of resistance R 8, the other end inserts the in-phase input end of Amp4; Ground connection behind the inverting input resistance in series R9 of Amp4; The two ends of resistance R 10 link to each other with output terminal with the inverting input of Amp4 respectively.
In order to compensate owing to writing pencil inconsistent with respect to the far and near different signals that cause of handwriting pad, also increased by the automatic gain amplifying circuit of handling host CPU control as shown in Figure 6 behind main amplifying circuit, the concrete connection of its circuit is: signal inserts the pin X7 of chip IC 5 through resistance R 11 from the IN end; The two ends of resistance R 12 link to each other with pin X6 with pin X7 respectively; The two ends of resistance R 13 link to each other with pin X5 with pin X6 respectively; The two ends of resistance R 14 link to each other with pin X4 with pin X5 respectively; The two ends of resistance R 15 link to each other with pin X3 with pin X4 respectively; The two ends of resistance R 16 link to each other with pin X2 with pin X3 respectively; The two ends of resistance R 17 link to each other with pin X1 with pin X2 respectively; The two ends of resistance R 18 link to each other with pin X0 with pin X1 respectively; The VEE end is unsettled; Sheet choosing end INH ground connection; Host CPU is handled in gating end A, the input of B, C end; Port x inserts the inverting input of amplifier Amp5; Ground connection behind the in-phase input end resistance in series R19 of Amp5; The two ends of resistance R 20 link to each other with output terminal with the inverting input of Amp5 respectively; The input end IN end of the output termination filtering circuit of Amp5.
Filtering circuit of the present invention as shown in Figure 7, its main effect is that the various high and low frequencies in the filtered signal disturb, its basic composition is the bandpass filter that is made of active low-pass filter and active high-pass filter series connection; The annexation of its circuit is: signal inserts the in-phase input end of amplifier Amp6 through resistance R 30, R31 from the IN end; One end ground connection of capacitor C 31, the other end inserts the in-phase input end of Amp6; One end of capacitor C 30 links to each other with the end of R30, R31 respectively, and the other end inserts inverting input and the output terminal of Amp6 respectively; The output terminal of Amp6 inserts the in-phase input end of amplifier Amp7 through capacitor C 32 backs; One end ground connection of resistance R 32, the other end inserts the in-phase input end of Amp7; Resistance in series R33 after the inverting input of Amp7 links to each other with output terminal, signal is by the output of output OUT end.
Amplitude detection circuit of the present invention as shown in Figure 8, its main effect is the peak envelope that takes out received signal, concrete connection is as follows: the signal through filtering is imported from the IN end, link to each other with an end of capacitor C 5 and the collector of triode Q1 with diode D1 by resistance R 22, the in-phase input end through amplifier Amp8 inserts the processing host CPU then; Ground connection behind the inverting input resistance in series R23 of Amp8, the two ends of resistance R 24 are inserted the processing host CPU respectively with after the inverting input of Amp8 links to each other with output terminal; The grounded emitter of Q1, base stage insert handles host CPU; The other end ground connection of C5.
Frequency detection circuit of the present invention as shown in Figure 9, its main effect is to detect the wave frequency relevant with pressure that writing pencil sends, insert the processing host CPU then and determine the pressure that writing pencil is suffered, concrete circuit connecting relation is: import by resistance R 41 from the IN end from the signal of filtering circuit output, the other end of R41 links to each other with the base stage of triode Q4; The collector of Q4 links to each other with an end of resistance R 42 with the CLK end of digital frequency divider IC8 respectively; The grounded emitter of Q4; The CLR termination of IC8 goes into to handle host CPU; Pin 1～pin 7 of IC8, pin 9, pin 12, pin 13, pin 15 are unsettled, and pin 14 inserts handles host CPUs; Digital frequency divider IC8 carries out 1024 grades of frequency divisions, then the cycle of signal, the frequency of definite signal thus behind the access processing host CPU detection frequency division.
Charging circuit as shown in figure 10 in the handwriting pad of the present invention, mainly form by energy storage device and charging circuit, energy storage device is that electric capacity is the electrochemical capacitor C1 of 1F, the main effect of diode D1 is that electric current flows to electric capacity by charge circuit when guaranteeing charging, and reversed flow can not take place, that is play the effect of unilateralization; Electric current flows into through the left end of R1, through flowing into energy storage device C1 through D1 again after the triode Q1 buffering; R1 and chip U1 constitute control circuit, its course of work is: when the voltage at capacitor C 1 two ends does not reach setting, chip U1 output low level, become high level through phase inverter U2, be divided into two-way then: the one tunnel through resistance R 3 for Q1 provides bias current, another road is after resistance R 6 and R7 dividing potential drop, the base stage of input triode Q2, make the Q2 conducting, D2 is luminous for the driven for emitting lights diode, and the expression charging is carried out; When the voltage at capacitor C 1 two ends reached setting, chip U1 exported high level, became low level through phase inverter U2, thereby made triode Q1, and Q2 ends, and cut off charging current on the one hand, turn-offed light emitting diode D2 simultaneously, and the expression charging process finishes; Its concrete circuit connecting relation is: an end of resistance R 1 links to each other with power supply VCC, and the other end links to each other with the collector of triode Q1; One end of resistance R 8 links to each other with power supply VCC, and the other end links to each other with the positive pole of light emitting diode D2; The negative pole of D2 links to each other with the collector of triode Q2; The grounded emitter of Q2; The base stage of Q2 links to each other with the end of resistance R 6, R7 respectively; The other end ground connection of R7; The other end of R6 links to each other with an end of resistance R 3, the output terminal of phase inverter U2 respectively; Link to each other with the pin of U1 3 other end of R3 of the input end of U2 links to each other with the base stage of Q1, an end of resistance R 4 respectively; The other end of R4 links to each other with the emitter of Q1; One end of resistance R 2 links to each other with the collector of Q1, and the other end links to each other with the emitter of Q1; Pin 1 ground connection of U1; The pin 2 of U1 links to each other with an end of resistance R 5; The other end of R5 links to each other with the positive pole of diode D1; The positive pole of D1 links to each other with the emitter of Q1, and negative pole links to each other with the positive pole of electrochemical capacitor C1; The minus earth of C1.
Charging inlet of the present invention as shown in figure 11, adopted the coaxial charging electrode of contact, be provided with the coaxial charging socket of contact on the handwriting pad, the afterbody of writing pencil is provided with the coaxial charging plug of contact, in the time of need charging to writing pencil its charging electrode that injects on the handwriting pad is got final product.
The present invention is a kind of wireless, active, handwriting pad that pressure is arranged.Writing pencil provides energy by the element with energy storage effect.Be the shunt-resonant circuit that inductance, electric capacity are formed in the writing pencil, mainly comprise receiving circuit, amplifying circuit, filtering circuit, amplitude, frequency detection circuit in the handwriting pad.The user holds the penholder of writing pencil in operating process, with suitable pressure, freely carrying out write (button on the penholder, its effect is equivalent to the left-right key of mouse) with word described of picture on the handwriting pad; By hardware in writing pencil, the plate and corresponding application software, with user's drawn handwriting tracks on handwriting pad, be reflected on the screen of computing machine, realize the purpose of wireless hand-written typing, as: on handwriting pad, write " Chinese " word with writing pencil, then demonstrate " Chinese " word on the computer screen at once, this greatly facilitates the Chinese characters in computer typing, also provides a kind of powerful drawing instrument for the image worker.
Claims (10)
1, a kind of wireless, Active tablet of forming by handwriting pad, writing pencil of being used for the computing machine typing, it is characterized in that: do not have line between writing pencil and the handwriting pad, adopting energy storage device in the writing pencil is its power supply, the handwriting pad of the size of pressure that can the perception pen is by receiving circuit, amplification, filtering circuit, amplitude, frequency detection circuit and handwriting pad charging circuit constitute; Connected mode between the foregoing circuit is as follows: the receiving end of receiving circuit receive by receiving loop X1, the X2 of vertical direction ... receiving loop Y1, the Y2 of X22 and horizontal direction ... the loop inductance that the receiving array that Y18 constitutes is formed, the input IN end of the output termination amplifying circuit of receiving circuit, the input IN end of the output OUT termination filtering circuit of amplifying circuit, the output OUT termination amplitude of filtering circuit, the input IN of frequency detection circuit end, the output OUT termination of amplitude, frequency detection circuit goes into to handle host CPU; The shunt-resonant circuit that the handwriting pad circuit is made up of electric capacity, inductance constitutes.
2, handwriting pad according to claim 1 is characterized in that: handwriting pad shunt-resonant circuit annexation is: its two ends are in parallel with variable inductance L1 and capacitor C 1 behind switch S 1, S2 difference series capacitance C3, the C4; One end of resistance R 1 links to each other with an end of capacitor C 2, capacitor C 5 respectively, and the other end links to each other with an end of capacitor C 6, resistance R 2 and the base stage of triode Q1 respectively; The collector of Q1 links to each other with the end of switch S 1, S2 respectively; One end of capacitor C 7 links to each other with the collector of Q1; Resistance R 4, capacitor C 8 backs in parallel one end ground connection, the other end links to each other with the end of C7, R3 respectively; The other end of R3 links to each other with the emitter of Q1; The other end of R2, C6, C5, C2 is ground connection respectively; Wherein switch S 1, S2 are the side switch of writing pencil, and its effect is equivalent to the left-right key of mouse.
3, handwriting pad according to claim 1, it is characterized in that: receiving circuit receives the signal of directions X receiving loop and the reception of Y direction receiving loop, by order gating receiving loop X1, X2 ... X18 ... X22 or Y1, Y2 ... Y18, can judge the position of writing pencil in X, Y coil according to the size of receiving signal, be writing pencil in the scope of which X or Y coil, and then judge the position of writing pencil in X or Y coil; Its concrete connection is: receiving loop is X, Y direction, and L11, L12, L13, L14, L15 are chip, and wherein L15, L14, L13 are used for realizing the directions X receiving function, and L11, L12 are used for realizing Y direction receiving function; The VEE termination ground voltage of L11, L12, L13, L14, L15; The X0 of L15, L14 chip ~ X7 port and L13 chip X2 ~ X7 port connect the directions X coil respectively; The X0 of L11, L12 chip ~ X7 port and L13 chip X0 ~ X1 port connect Y direction coil respectively, and the output terminal of these coils is ground connection all; The INH end is the sheet choosing, and the INH end of L11, L12, L13, L14, L15 chip inserts respectively handles host CPU; A end B end C end is a coil gating end, and A, B, the C gating end of L11, L12, L13, L14, L15 chip are public, and unified the access handled host CPU; The X end of L11, L12, L13, L14, L15 chip is an output received signal after output port 3 links to each other.
4, handwriting pad according to claim 1, it is characterized in that: in the handwriting pad in the amplifying circuit received signal from IN end input, carry out level Four by integrated transporting discharging and amplify, the influence of DC component and low-frequency disturbance is eliminated in the high-pass filtering by being undertaken by resistance-capacitance network for twice therebetween; Its concrete circuit connecting relation is: received signal is held the in-phase input end that is input to amplifier Amp1, ground connection behind the inverting input resistance in series R1 of Amp1 from IN; The two ends of resistance R 2 link to each other with output terminal with the inverting input of Amp1 respectively; The output terminal of Amp1 inserts the in-phase input end of amplifier Amp2 through capacitor C 1 back; One end ground connection of resistance R 3, the other end inserts the in-phase input end of Amp2; Ground connection behind the inverting input resistance in series R4 of Amp2; The two ends of resistance R 5 link to each other with output terminal with the inverting input of Amp2 respectively; The output terminal of Amp2 connects the in-phase input end of amplifier Amp3; Ground connection behind the inverting input resistance in series R6 of Amp3; The two ends of resistance R 7 link to each other with output terminal with the inverting input of Amp3 respectively; The output terminal of Amp3 inserts the in-phase input end of amplifier Amp4 through capacitor C 2 backs; One end ground connection of resistance R 8, the other end inserts the in-phase input end of Amp4; Ground connection behind the inverting input resistance in series R9 of Amp4; The two ends of resistance R 10 link to each other with output terminal with the inverting input of Amp4 respectively.
5, handwriting pad according to claim 1 is characterized in that: the concrete annexation of automatic gain amplifying circuit is: signal inserts the pin X7 of chip IC 5 through resistance R 11 from the IN end; The two ends of resistance R 12 link to each other with pin X6 with pin X7 respectively; The two ends of resistance R 13 link to each other with pin X5 with pin X6 respectively; The two ends of resistance R 14 link to each other with pin X4 with pin X5 respectively; The two ends of resistance R 15 link to each other with pin X3 with pin X4 respectively; The two ends of resistance R 16 link to each other with pin X2 with pin X3 respectively; The two ends of resistance R 17 link to each other with pin X1 with pin X2 respectively; The two ends of resistance R 18 link to each other with pin X0 with pin X1 respectively; The VEE end is unsettled; Sheet choosing end INH ground connection; Host CPU is handled in gating end A, the input of B, C end; Port x inserts the inverting input of amplifier Amp5; Ground connection behind the in-phase input end resistance in series R19 of Amp5; The two ends of resistance R 20 link to each other with output terminal with the inverting input of Amp5 respectively; The input end IN end of the output termination filtering circuit of Amp5.
6, handwriting pad according to claim 1 is characterized in that: filtering circuit is the bandpass filter that is made of active low-pass filter and active high-pass filter series connection; The annexation of its circuit is: signal inserts the in-phase input end of amplifier Amp6 through resistance R 30, R31 from the IN end; One end ground connection of capacitor C 31, the other end inserts the in-phase input end of Amp6; One end of capacitor C 30 links to each other with the end of R30, R31 respectively, and the other end inserts inverting input and the output terminal of Amp6 respectively; The output terminal of Amp6 inserts the in-phase input end of amplifier Amp7 through capacitor C 32 backs; One end ground connection of resistance R 32, the other end inserts the in-phase input end of Amp7; Resistance in series R33 after the inverting input of Amp7 links to each other with output terminal, signal is by the output of output OUT end.
7, handwriting pad according to claim 1, it is characterized in that: amplitude detection circuit specifically connects as follows: the signal through filtering is imported from the IN end, link to each other with an end of capacitor C 5 and the collector of triode Q1 with diode D1 by resistance R 22, the in-phase input end through amplifier Amp8 inserts the processing host CPU then; Ground connection behind the inverting input resistance in series R23 of Amp8, the two ends of resistance R 24 are inserted the processing host CPU respectively with after the inverting input of Amp8 links to each other with output terminal; The grounded emitter of Q1, base stage insert handles host CPU; The other end ground connection of C5.
8, handwriting pad according to claim 1 is characterized in that: the concrete circuit connecting relation of frequency detection circuit is: import by resistance R 41 from the IN end from the signal of filtering circuit output, the other end of R41 links to each other with the base stage of triode Q4; The collector of Q4 links to each other with an end of resistance R 42 with the CLK end of digital frequency divider IC8 respectively; The grounded emitter of Q4; The CLR termination of IC8 goes into to handle host CPU; Pin 1～pin 7 of IC8, pin 9, pin 12, pin 13, pin 15 are unsettled, and pin 14 inserts handles host CPUs; Digital frequency divider IC8 carries out 1024 grades of frequency divisions, then the cycle of signal, the frequency of definite signal thus behind the access processing host CPU detection frequency division.
9, handwriting pad according to claim 1, it is characterized in that: charging circuit is made up of energy storage device and charging circuit in the handwriting pad, its concrete circuit connecting relation is: an end of resistance R 1 links to each other with power supply VCC, and the other end links to each other with the collector of triode Q1; One end of resistance R 8 links to each other with power supply VCC, and the other end links to each other with the positive pole of light emitting diode D2; The negative pole of D2 links to each other with the collector of triode Q2; The grounded emitter of Q2; The base stage of Q2 links to each other with the end of resistance R 6, R7 respectively; The other end ground connection of R7; The other end of R6 links to each other with an end of resistance R 3, the output terminal of phase inverter U2 respectively; The input end of U2 links to each other with the pin of U1 3; The other end of R3 links to each other with the base stage of Q1, an end of resistance R 4 respectively; The other end of R4 links to each other with the emitter of Q1; One end of resistance R 2 links to each other with the collector of Q1, and the other end links to each other with the emitter of Q1; Pin 1 ground connection of U1; The pin 2 of U1 links to each other with an end of resistance R 5; The other end of R5 links to each other with the positive pole of diode D1; The positive pole of D1 links to each other with the emitter of Q1, and negative pole links to each other with the positive pole of electrochemical capacitor C1; The minus earth of C1.
10, handwriting pad according to claim 1, it is characterized in that: the writing pencil charging inlet adopts the coaxial charging electrode of contact, be provided with the coaxial charging socket of contact on the handwriting pad, the afterbody of writing pencil is provided with the coaxial charging plug of contact, in the time of need charging to writing pencil its charging electrode that injects on the handwriting pad is got final product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100090150A CN1313912C (en) | 2004-04-15 | 2004-04-15 | Radio active hand writing board for computer inputting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100090150A CN1313912C (en) | 2004-04-15 | 2004-04-15 | Radio active hand writing board for computer inputting |
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| Publication Number | Publication Date |
|---|---|
| CN1564193A CN1564193A (en) | 2005-01-12 |
| CN1313912C true CN1313912C (en) | 2007-05-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2004100090150A Expired - Lifetime CN1313912C (en) | 2004-04-15 | 2004-04-15 | Radio active hand writing board for computer inputting |
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| CN (1) | CN1313912C (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4751191B2 (en) * | 2005-12-12 | 2011-08-17 | 株式会社ワコム | Position detector and position input device |
| US20070146351A1 (en) | 2005-12-12 | 2007-06-28 | Yuji Katsurahira | Position input device and computer system |
| CN101685355B (en) * | 2008-09-28 | 2012-05-02 | 汉王科技股份有限公司 | Device and system for multipath handwriting track input |
| CN101739148B (en) * | 2008-11-10 | 2012-09-05 | 汉王科技股份有限公司 | Hand input positioning device |
| CN101751196B (en) * | 2008-12-22 | 2011-08-17 | 汉王科技股份有限公司 | Method for measuring distance between drawing pen and drawing board |
| CN103219025B (en) * | 2012-01-18 | 2020-03-06 | 台均科技（深圳）有限公司 | Audio recording method and device |
| US10146371B2 (en) * | 2016-03-29 | 2018-12-04 | Microchip Technology Incorporated | Water robustness and detection on capacitive buttons |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030146906A1 (en) * | 2002-02-04 | 2003-08-07 | Chung-Chen Lin | Tracking and pressure-sensitive digital pen |
| CN1453741A (en) * | 2002-04-22 | 2003-11-05 | 北京汉王科技有限公司 | Wireless passive hand-writing board for computer log-in |
-
2004
- 2004-04-15 CN CNB2004100090150A patent/CN1313912C/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030146906A1 (en) * | 2002-02-04 | 2003-08-07 | Chung-Chen Lin | Tracking and pressure-sensitive digital pen |
| CN1453741A (en) * | 2002-04-22 | 2003-11-05 | 北京汉王科技有限公司 | Wireless passive hand-writing board for computer log-in |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1564193A (en) | 2005-01-12 |
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