CN1307520C - Position detection apparatus and its position indicator - Google Patents
Position detection apparatus and its position indicator Download PDFInfo
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- CN1307520C CN1307520C CNB02143266XA CN02143266A CN1307520C CN 1307520 C CN1307520 C CN 1307520C CN B02143266X A CNB02143266X A CN B02143266XA CN 02143266 A CN02143266 A CN 02143266A CN 1307520 C CN1307520 C CN 1307520C
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Abstract
The present invention provides a position detection apparatus and a position indicator thereof. The position indicator with simple structure and low cost can correctly detect continuous quantity corresponding to operation in high sampling speed. A resistor (26) whose resistance is Rmin, a resistor (27) whose resistance is Rmax and a variable resistor element (28) corresponding to operation quantity are connected with a resonance circuit (11) of the position indicator in a first specific time slot, a second specific time slot and a third specific time slot which are based on given timing information from a plotting tablet, wherein the resistance of the variable resistor element (28) changes within the range of Rmax to Rmin. Signals obtained in the first specific time slot and the second specific time slot on the side of the plotting tablet are horizontally and respectively used as the lower limit and the upper limit of the operation quantity, and a signal obtained in the third time slot is horizontally transformed into operation quantity, so the position detection apparatus can not be affected by the height and the gradient of the position indicator and can detect the continuous quantity in the fast sampling speed.
Description
Technical field
The present invention relates to a kind of position detecting device and position indicator thereof that is used for to computing machine tablet pattern or literal.
Background technology
Existing this position detecting device is opened in the clear 64-53223 communique (in first to file 1) the spy and to be disclosed.
In above-mentioned position detecting device, be provided with the resonant tank that forms by coil and capacitor in the position indicator, by between graphic tablet and position indicator, exchanging electric wave, obtain the coordinate figure of the indicating positions of this position indicator generation.In view of the above, when being chosen in the concurrent radio wave of a plurality of loop coils that the position probing direction in the graphic tablet is set up in parallel successively, reception is located at the electric wave that the resonant tank in the position indicator is launched once more, asks for the coordinate figure of indicating positions according to the intensity distributions of this received signal.
In this kind position detecting device, except that the coordinate figure of indicating positions, specify the information of the state of the actual indicating positions that should import as expression, hope will together be imported such as continually varying information such as the thickness of line, tone, lightness and coordinate figure.
In above-mentioned application 1 formerly, as the coil that constitutes resonant tank, use the induction coefficient random notes to press and change and the continually varying coil, the resonant frequency random notes are pressed and are changed and when changing continuously, go out the continuous variation of this resonant frequency by the continuous change-detection at phasing degree, press thereby can obtain pen.
Yet, scope with detected the corresponding phasing degree of scope of pressing, when changing with respect to principal elements such as the distance of graphic tablet and angles of inclination with position indicator, also with the induction coefficient self of coil through the time change, can not correctly detect the problem that pen presses and just occur.
The applicant opens in the flat 7-225644 communique (in first to file 2) the spy, proposed by press except that pen with the form of continuous quantity set respectively 3 kinds of colors of red, green, blue mode, can import tone, color depth etc.That is, pen is pressed and the amount of 3 colors in order to set respectively, and is provided with 4 variable capacity devices, in different 4 time slots (timing), these 4 variable capacity devices is connected with resonant tank successively respectively, thereby just can independently asks for these 4 continuous quantities.
In this device, owing to try to achieve the signal phase of any variable capacity device when all not connecting in advance, because of above-mentioned induction coefficient at the such coil of first to file 1 changes the complete obiteration that influences that causes in time.But, with the scope at the corresponding phasing degree of scope of the continuous quantity of asking for, follow in first to file 1 equally, because random notes change with respect to the variation of principal elements such as the distance of graphic tablet and angle of inclination, so can not correctly ask for continuous quantity.
In addition, the applicant opens in the flat 5-313439 communique (in first to file 3) the spy, has proposed a kind of position indicator, thereby it detects continuous quantity by continuous quantity being converted into 2 ary codes in position indicator inside and turning back to graphic tablet.
Utilize this device,, have the such problem of complex structure of position indicator though can correctly ask for the continuous quantity that the height that is not subjected to the relative graphic tablet of position indicator and degree of tilt influence.In addition,, just must repeat the receiving and transmitting signal of this that special number, so just the low problem of sample rate be arranged for a continuous quantity being returned with 2 ary codes.
Summary of the invention
At above-mentioned such problem points, the object of the present invention is to provide a kind of position detecting device and its position indicator, it can make simple in structure, the correct detection at low cost and the corresponding continuous quantity of operation of position indicator.
In addition, another object of the present invention is to provide a kind of position detecting device and position indicator thereof, can utilize quick sampling speed correctly to detect and operates corresponding continuous quantity.
To achieve these goals, the invention provides a kind of position detecting device, by the position indicator that possesses the resonant tank that comprises coil and capacitor at least, by receiving and dispatching electromagnetic wave to this position indicator, the graphic tablet of obtaining the coordinate figure of the indicating positions that is produced by this position indicator constitutes, generation comprises the electromagnetic wave of given timing (timing) information that comes from this graphic tablet, from the induced voltage that in the resonant tank that receives this electromagnetic position indicator, produces, extract above-mentioned given timing information, in the particular time-slot of the timing information given based on this, control is with the resonance characteristics of the resonant tank of operating the position indicator that changes, detect electromagnetic phase place or intensity from the resonant tank generation of position indicator in this specific time slot, this pick-up unit has the structure that the following describes.
That is, in this position indicator, be provided with:
The 1st resonance characteristics control device, control make the interior numerical value of given variable range of its this resonance characteristics that becomes corresponding continued operation amount based on the resonance characteristics of the resonant tank in the 1st particular time-slot of given timing information;
The 2nd resonance characteristics control device, control make the maximal value in its given variable range that becomes this resonance characteristics based on the resonance characteristics of the resonant tank in the 2nd particular time-slot of given timing information;
The 3rd resonance characteristics control device, control make the minimum value in its given variable range that becomes this resonance characteristics based on the resonance characteristics of the resonant tank in the 3rd particular time-slot of given timing information.
In addition, in graphic tablet, be provided with:
The detected value acquisition device, electromagnetic phase place or intensity that it will be in the above-mentioned the the 1st, the 2nd, the 3rd specific time slot produces from the resonant tank of position indicator are obtained as the 1st, the 2nd, the 3rd detected value respectively;
Processing apparatus, it with one in the above-mentioned the 2nd and the 3rd detected value as the upper limit, with another as lower limit, by making above-mentioned the 1st detected value corresponding in the above-mentioned scope that is limited to lower limit, asking for the continued operation amount.
Description of drawings
Fig. 1 is the structural drawing of the 1st embodiment of expression position indicator of the present invention.
Fig. 2 is the structural drawing of the 1st embodiment of expression graphic tablet of the present invention.
Fig. 3 is the oscillogram of the action of expression the present invention the 1st embodiment.
Fig. 4 is the processing flow chart of position probing action in the 1st embodiment.
Fig. 5 is the structural drawing of the 2nd embodiment of expression position indicator of the present invention.
Fig. 6 is the structural drawing of the 2nd embodiment of expression position detecting device of the present invention
Fig. 7 is the oscillogram of the action of expression the present invention the 2nd embodiment.
Fig. 8 is the structural drawing of the 3rd embodiment of expression position indicator of the present invention.
Fig. 9 is the outside drawing of the 3rd embodiment of expression position indicator of the present invention.
Figure 10 is the oscillogram of the action of expression the present invention the 3rd embodiment.
Symbol description: 11a coil, 11b capacitor, 11 resonant tanks, 12 electric power loops, 13 detector circuits, 14,19,61～63 comparators, 15 shift registers, 16 integrating networks, 17,23～25,84 transverters, 18,20～22 differential loops, 26,27,88～92 resistance, 28,84～87 variable resistor elements, 29～31 diodes, 41 loop coil groups, 42 select the loop, 43 oscillation circuits, 44 current amplifiers, 45 transmitting-receiving conversion loops, 46 amplifying return circuits, 47 detector circuits, 48,72 low-pass filters, 49,73 integrating amplifiers, 50,74 AD change the loop, 51CPU, 64,65 capacitors, 66 variable capacity devices, 67～69 analog switches, 71 synchronous detection loops, 80 AND circuit, 81 one shot multivibrator loops, 82 counting circuits, 83 analog multiplexers, 84 ' pen is pressed test section, 85 '～87 ' dial.
Embodiment
[first embodiment]
(structure of first embodiment)
Fig. 1 represents to utilize the structure of first embodiment of position indicator of the present invention.
Among the figure, 11a is a coil, and 11b is a capacitor, and they are formed on the resonant tank 11 of fixed frequency fo resonance.In addition, the 12nd, be used for from the HF voltage that resonant tank 11 produces, extracting the electric power loop of power supply.
The 13rd, be used to detect detector circuit with the corresponding time slot of signal transmitting and receiving of the signal (b) that produces from resonant tank 11, the output terminal of this detector circuit 13 is connected with comparator 14, will extract with the corresponding clock pulse signal of signal transmitting and receiving (c) of the electric wave of graphic tablet.This clock pulse signal (c) is connecting clock pulse input terminal of shift register 15.
Clock pulse signal (c) is connected with integrating network 16, obtains producing during the only described afterwards continuous transmission signal (d) of voltage.This signal (d) offers the reseting terminal of shift register 15.And this signal (d) is by transverter 17, differential loop 18 and comparator 19, only generates the signal (e) of output high level in the time span that finishes from continuous transmission to begin till finish during the next one sends.This signal (e) is connecting data input pin of shift register 15.
In addition, 3 outputs (Q0～Q2) be connected with the differential loop 20,21,22 of same time constant respectively that comes from shift register 15. Differential loop 20,21,22 links to each other with transverter 23,24,25 respectively.
The variable resistor element 28 that is made of pressure sensitive conductive rubber etc. is connected with transverter 25, and variable resistor element 28 is connected with resonant tank 11 by diode 31.
The resistance 27 that the resistance maximal value Rmax that follows variable resistor element 28 to obtain has identical value is connected with transverter 24, and this resistance 27 is connected with resonant tank 11 by diode 30.In addition, the resistance 26 that the resistance minimum value Rmin that follows variable resistor element 28 to obtain has identical value is connected with transverter 23, and this resistance 26 is connected with resonant tank 11 by diode 29.
Fig. 2 represents to remove the position indicator part afterwards of position detecting device of the present invention inside, that is, and and the structure of the 1st embodiment of graphic tablet.
Among the figure, 41 dispose X1～X40 and Y1～Y40 as the loop coil group respectively in X-direction and Y direction.These loop coils are connected with the selection loop 42 of selecting each loop coil.
The 43rd, produce the oscillation circuit that resonates in the frequency identical with the resonant frequency fo of foregoing position indicator, this oscillation circuit 43 is connected in the transmitter side (T) in transmitting-receiving conversion loop 45 by current amplifier 44.This transmitting-receiving conversion loop 45 is connecting selection loop 42, is the electric wave of fo towards the position indicator transmission frequency from the loop coil of selecting.
The receiver side (R) in transmitting-receiving conversion loop 45 is connecting amplifying return circuit 46, and this amplifying return circuit 46 is connected with detector circuit 47.In addition, detector circuit 47 is connecting low-pass filter 48 again, and low-pass filter 48 links to each other with integrating amplifier 49, received signal is stored keep certain hour.The voltage that keeps by integrating amplifier 49 outputs to AD conversion loop 50, and the output in AD conversion loop 50 is connected with CPU51.
CPU51 delivers to control signal respectively and selects loop 42, transmitting-receiving conversion loop 45, integrating amplifier 49 and AD conversion loop 50.
(action of first embodiment)
Below, the action of present embodiment is described based on above-mentioned Fig. 1 and Fig. 2.
In the present embodiment, at first the situation with existing apparatus is the same, carries out comprehensive scanning motion, is used for detecting generally position indicator and where is positioned at go the position probing face that is formed by loop coil group 41.
Switch between 40 loop coils separately in proper order whole X-directions and Y direction on this comprehensive scanning motion limit, limit transmitting-receiving electric wave, detect whether receive the above signal level of set-point, extract the loop coil (peaking coil) of signal level maximum then.
Below, the action according to the Position Approximate of above-mentioned comprehensive scanning motion explanation position indicator after clear and definite.Near when being positioned over the intersection point of loop coil X7 and Y5 to position indicator in the present embodiment action describes.
Fig. 3 represents the summary of the action waveforms of each parts in the action behind the Position Approximate of clear and definite position indicator.In Fig. 3, among part presentation graphs 1 shown in mark a～j and Fig. 2 with the waveform of the represented part of identical mark.
At first, when CPU51 selects loop coil X7 (peaking coil) from selecting loop 42, apply the such control signal of transmitter side (T) to transmitting-receiving conversion loop 45.Like this, radiate the electric wave of frequency f o from loop coil X7.Make the radiation of this electric wave continue the long time (during sending continuously) such as 1mS.And then, CPU51 applies the such control signal of receiver side (R) to transmitting-receiving conversion loop 45.
Even the transmission of electric wave owing to be through with, signal also can be in resonant tank 11 the residual regular hour, so this signal is detected as signal (i) by graphic tablet.This reception period continue till fully decaying to the signal of resonant tank 11 during in (such as 100 μ S).
If the reception period after above-mentioned continuous transmission finishes, press in order to detect the pen that puts on the variable resistor element 28, repeat (such as 50 μ S) and reception period (100 μ S) during 3 relatively shorter transmissions respectively.
At the 1st time receiving and transmitting signal in the time, as shown in Figure 3, the terminal Q0 of shift register 15 rises to high level, in the time that this rising edge begins to determine according to the time constant in differential loop 20, signal f becomes low level, and signal b at the two ends in interior resonance loop 11 decays by diode 29 and resistance 26 during this.
Equally, during the 2nd time receiving and transmitting signal, the signal b at resonant tank 11 two ends also decays by diode 30 and resistance 27.
Equally, during the 3rd time receiving and transmitting signal, the signal b at resonant tank 11 two ends also decays by diode 31 and variable resistor element 28.
At this, because the intensity of the signal that graphic tablet receives in the 1st～3 time is the resistance of corresponding resistance 26,27 and variable resistor element 28 respectively, so the level of these integrations output j is respectively Va, Vb, Vp, as shown in Figure 3, Va is lower than Vb, and Vp is between Va and the Vb.That is, because the load that the pen that applies is pressed is 0 o'clock, Vp=Vb, during peak load (500g), Vp=Va is in which level between Va and the Vb if pro rata is calculated Vp, just can correctly obtain a pressure value that is in the load range that will detect.This action is a feature of the present invention.
Finish if above-mentioned pen is pressed between detection period, CPU51 is used to the part scanning motion that detects the action of Y-axis coordinate figure and be used to detect the X-axis coordinate figure.This action is carried out in the mode identical with the situation of existing apparatus.
Fig. 4 has represented the treatment scheme of position probing action in above-mentioned the 1st embodiment.In addition, in Fig. 4, i represent pen press between detection period in the electric wave receiving and transmitting signal return number, V1=Va wherein, V2=Vb, V3=Vp.
(expansion of the 1st embodiment)
In the present embodiment, the also available detection of carrying out continuous quantity by the method outside the variable resistor element of pressure-sensitive conductive rubber.
For the load that is applied on the variable resistor element is that 0 o'clock resistance value is probably in infinitely-great situation, differential loop 21, transverter 24, resistance 27 and diode 30 in the omission position indicator and pen are pressed the 2nd time receiving and transmitting signal between detection period, also can use as Vb following continuous transmission reception level afterwards closely.
[the 2nd embodiment]
(structure of the 2nd embodiment)
Fig. 5 represents the structure of the 2nd embodiment of position indicator of the present invention, and the identical structure division of figure neutralization the 1st embodiment is represented with prosign.The structure of Fig. 5 and the different place of the 1st embodiment (Fig. 1) are the loop structures between each differential loop 20,21,22 and the resonant tank 11.
In Fig. 5, differential loop 20,21,22 is connected with comparator 61,62,63 respectively, and comparator 61,62,63 is connected to the control terminal of analog switch 67,68,69.
The 66th, the variable capacity device that changes and change pressed in the capacity random notes, and this variable capacity device 66 is connected with resonant tank 11 side by side by analog switch 69.At this, make the pen that will detect be pressed in 0g in the scope of 500g, under the load in this scope, the static capacity of variable capacity device 66 changes in the scope of Cmin～Cmax.
Fig. 6 represents to use the structure of the 2nd embodiment of graphic tablet of the present invention, and the part identical with the 1st embodiment represented with prosign.The place that the structure of Fig. 6 is different with the 1st embodiment (Fig. 2) is, in order to detect from position that position indicator returns the signal that comes mutually and to ask for pen and press, added a receiving system.
In Fig. 6, the 71st, the synchronous detection loop is connected with amplifying return circuit 46.Oscillatory circuit 43 is connected with synchronous detection loop 71, supplies with to become the time clock that detects the benchmark that is purpose with the position mutually.Synchronous detection loop 71 joins with low-pass filter 72, and low-pass filter 72 links to each other with integrating amplifier 73, received signal is stored keep certain hour.By the voltage that integrating amplifier 73 keeps, output to AD conversion loop 74, the output in AD conversion loop 74 is connected with CPU51.
(action of the 2nd embodiment)
Below, the action of present embodiment is described based on above-mentioned Fig. 5 and Fig. 6.
Present embodiment is identical with the 1st embodiment, at first, carries out comprehensive scanning motion, is used for probably detecting position indicator and where is placed on the position probing face that formed by loop coil group 41.
Secondly, describe at the action behind the Position Approximate of learning position indicator by above-mentioned comprehensive scanning motion.Near the action that position indicator is positioned over the intersection point of coil X7 and Y5 describes in the present embodiment.
Fig. 7 is the summary of the action waveforms of each parts in the action after learning the Position Approximate of position indicator.In Fig. 7, the information that the mark of a～k is represented is being represented the waveform of the part shown in the same mark among Fig. 5 and Fig. 6.
Present embodiment as shown in Figure 7, continue send continuously during after, repeat pen and press between detection period, between Y coordinate detection period, between X coordinate detection period, this point is identical with the situation of the 1st embodiment.And the situation of the appearance of signal a～j and the 1st embodiment is roughly the same.But between pen was pressed detection period, the level of integration output (j) did not change, and depended on that the level from the integration output (k) of the signal in synchronous detection loop 71 changes, and this point is different with the situation of the 1st embodiment.
In Fig. 7, send continuously and after the reception period after it finishes, press in order to detect the pen that is applied on the variable capacity device 66, repeat (such as 50 μ S) and reception period (such as 100 μ S) during 3 relatively shorter transmissions respectively.
When the 1st reclaimed signalling, signal f became high level, conducting analog switch 67.For this reason, because capacitor 64 is connected with resonant tank 11, the variation of resonant frequency of resonant tank 11 is very little.Synchronous detection loop 71 goes out the frequency change of returning the signal that comes from this resonant tank by the change-detection according to the position phase, from integrating amplifier 73 output levels and this corresponding signal k.
Equally, the 2nd reclaims when signaling, and capacitor 65 is connected in resonant tank 11, the corresponding signal k of static capacity of output and capacitor 65.
Equally, the 3rd reclaims when signaling, and capacitor 66 is connected in resonant tank 11, and output is pressed corresponding signal k with this pen constantly.
At this, owing to the intensity of the signal k that in the 1st～3 time, exports, correspond respectively to the value of capacitor 64,65 and variable capacity device 66 from integrating amplifier 73, respectively as Va, Vb, Vp, as shown in Figure 6, Vp is between Va and the Vb at this.That is, the load that the pen that applies is pressed is 0 o'clock, Vp=Va, and during peak load (500g), Vp=Vb if therefore pro rata is calculated Vp and is in which level between Va and the Vb, just can correctly obtain and is in the interior pressure value of detected load range.This action is a feature of the present invention.
After above-mentioned pen was pressed and finished between detection period, identical with the situation of the 1st embodiment, CPU51 was used to detect the action of Y-axis coordinate figure and X-axis coordinate figure.
In above-mentioned the 2nd embodiment, the treatment scheme of position probing action is basically with the 1st
The situation of embodiment is identical.
(expansion of the 2nd embodiment)
Though for capacitor 64,65 being connected with resonant tank 11 with variable capacity device 66 and having used analog switch, also can identically with the 1st embodiment connect in the present embodiment by diode.
In the present embodiment,, also can constitute synchronous detection loop 71, make this relation reverse although the output of the big more integrating amplifier 73 of the static capacity of variable capacity device will be more little.
[the 3rd embodiment]
(structure of the 3rd embodiment)
Fig. 8 represents the structure of the 3rd embodiment of position indicator of the present invention, and the identical structure division of figure neutralization the 1st embodiment is represented with prosign.
Among the figure, 11a is a coil, and 11b is a capacitor, is formed in the resonant tank 11 that resonance takes place fixed frequency fo thus.The 12nd, be used for from the HF voltage that resonant tank 11 produces, extracting the electric power loop of power supply.
The 13rd, be used for detecting detector circuit with the corresponding time clock of signal transmitting and receiving of the signal (b) that produces from resonant tank 11, the output terminal of this detector circuit 13 is connected with comparator 14, will extract with the corresponding clock pulse signal of signal transmitting and receiving (c) of the electric wave of graphic tablet.
This clock pulse signal (c) is connecting integrating network 16, obtains to produce the signal (d) of voltage during the only described afterwards continuous transmission.In addition, input port of clock pulse signal (c) and AND circuit 80 and one shot multivibrator loop 81 are connected.
The output terminal of AND circuit 80 is connected on clock pulse input terminal of counting circuit 82, and the output of integrating network 16 is connected with the reseting terminal of counting circuit 82.In addition, be connected in the selection terminal of analog multiplexer 83 from low level 3 those special lead-out terminal Q0～Q2 of counting circuit 82 outputs.The lead-out terminal Q3 of counting circuit 82 is connected the another one input end of AND circuit 80 by transverter 84.
The output terminal in one shot multivibrator loop 81 links to each other with the control end of analog multiplexer 83.The common terminal of analog multiplexer 83 is connected with the GND side of resonant tank 11, selects the pairing resistance of value of 3 those special input signal Q0～Q2 to be connected with resonant tank 11 with variable resistor element.But the value of these 3 those special input signal Q0～Q2 is not connected with any one device during with (111) in (000).
84～87th, variable resistor element, resistance separately changes with operation.And, 88～92nd, resistance.
Fig. 9 represents to utilize the outward appearance of the 3rd embodiment of position indicator of the present invention, and it is used for coming input pen to press and 3 kinds of analog quantitys by operation.In Fig. 9,84 ' be that pen is pressed test section, will change by the resistance that applies load variable resistor element 84 at this.In addition, 85 ', 86 ', 87 ' be dial, rely on these operations to change the resistance of variable resistor element 85,86,87 respectively.
In the present embodiment, utilize 3 dials, set the distribution of red, blue, green three kinds of primary colours, can be as the electronic pen that except that pen is pressed, can also import tone.
Utilize this device to detect to put on pen press a test section 84 ' load, such as scope at 0～500g.Variable resistor element 84 is 0 o'clock at load, and resistance becomes infinity, and resistance is RAmin during 500g.
Variable resistor element 85～87, according to dial 85 '～87 ' operation, resistance changes in the scope of 0～RBmax.
In addition, the minimum value RAmin of the value of resistance 88～91 and variable resistor element 84 has same value, and resistance 92 is maximal value RBmax sums (RAmin+RBmax) of the minimum value RAmin and the variable resistor element 85～87 of variable resistor element 84.
As the graphic tablet that the position indicator with present embodiment uses jointly, can be structure shown in Figure 2.
(action of the 3rd embodiment)
Below, based on above-mentioned Fig. 8 with Fig. 2 of the graphic tablet that uses in the above described manner, the action of present embodiment is described.
Identical with the situation of the 1st, the 2nd embodiment, in the present embodiment, at first, carry out comprehensive scanning motion, be used for roughly detecting position indicator and where be positioned over go the position probing face that forms by loop coil group 41.
Then, illustrate by above-mentioned comprehensive scanning motion and know further action behind the Position Approximate of position indicator.Near the action that position indicator is positioned over the intersection point of coil X7 and Y5 describes in the present embodiment.
Figure 10 is illustrated in the summary of the action waveforms of each parts in the action behind the Position Approximate of learning position indicator.In Figure 10, the information that the mark of a～j is represented is being represented among Fig. 8 and Fig. 2 the waveform with the part shown in the same mark.
At first, when CPU51 selects loop coil X7 from selecting loop 42, apply the such control signal of transmitter side (T) to transmitting-receiving conversion loop 45.Like this, radiate the electric wave of frequency f o from loop coil X7.Make the radiation of this electric wave continue the long time (during sending continuously) such as 1mS.And then, CPU51 applies the such control signal of receiver side (R) to transmitting-receiving conversion loop 45.
The transmission of electric wave even be through with, signal also can be in resonant tank 11 the residual regular hour, so this signal is detected as signal (i) by graphic tablet.This reception period last till the signal of resonant tank 11 till fully decaying during in (such as 100 μ S).This moment detected signal level V0 become resistance not with the value of arbitrary resonant tank connection status.
If the reception period after above-mentioned continuous transmission finishes, for detect put on pen press a test section 84 ' load and dial 85 '～87 ' setting value, repeat (such as 50 μ S) and reception period (100 μ S) during 6 relatively shorter transmissions respectively.
The 1st when reclaim signaling, and as shown in figure 10, because analog multiplexer 83 is selected the 1st terminal, resistance R 91 is connected with resonant tank 11, and detected signal level V1 is the numerical value corresponding to resistance RAmin on this period inherent graphic tablet.
The 2nd when reclaim signaling, because analog multiplexer 83 is selected the 2nd terminal, resistance 92 is connected with resonant tank 11, and detected signal level V2 is the numerical value corresponding to resistance RBmax and RAmin sum on this period inherent graphic tablet.
During the 3rd time receiving and transmitting signal, because analog multiplexer 83 is selected the 3rd terminal, variable resistor element 84 is connected in resonant tank 11, and detected signal level V3 is a numerical value of setting resistance corresponding to variable resistor element 84 on the inherent graphic tablet during this period.
This value representation put on pen press a test section 84 ' load, this is loaded in the scope of 0～500g, changes in the scope of V1 at the V0 that has tried to achieve.Even the signal level V3 of this moment changes with the height of position indicator and degree of tilt etc.,, calculate and to try to achieve correct load value by carrying out these ratios because V0 and V1 also change with its variation.This action is a feature of the present invention.
According to its computing method, can carry out the calculating of similar following formula:
Load=(V0-V3) * 500 (g)/(V0-V1).
When the 4th reclaims signalling, because analog multiplexer 83 is selected the 4th terminal, variable resistor element 85 is connected with resonant tank 11 with 88, and detected signal level V4 is a numerical value of setting resistance corresponding to variable resistor element 85 on the inherent graphic tablet during this period.
This value representation dial 85 ' set condition, set according to this, V4 changes in the scope of V2 at V1.Even the signal level V4 of this moment changes with the height and the degree of tilt of indicator, because V1 and the V2 corresponding with this variation also changes, calculate by carrying out these ratios, can stablize the set condition of trying to achieve dial.
At this, dial 85 ' be set at red amount (R), if its value in 0～100 scope, according to these computing method, can be carried out the calculating of similar following formula
R＝(V4-V1)×100/(V2-V1)
Equally, dial 86 ' and 87 ' setting value also can try to achieve according to following formula:
G＝(V5-V1)×100/(V2-V1)
B＝(V6-V1)×100/(V2-V1)。
After above-mentioned pen was pressed and finished between detection period, identical with the 1st, the 2nd embodiment, CPU51 was used to detect the action of Y-axis coordinate figure and X-axis coordinate figure.
The treatment scheme of position probing action in above-mentioned the 3rd embodiment, return number and become 6 times outside these 2 even remove the receiving and transmitting signal that during sending continuously, also carries out (being that pen is pressed between detection period in the 1st embodiment) electric wave between input, operation information detection period, basically with the 1st
Embodiment is identical.
(expansion of the 3rd embodiment)
In the present embodiment, variable resistor element 85～87 is that the resistance of RAmin is connected in series with resistance respectively, reference value V1 when reference value under the minimum situation of being set in of dial can press be detected with pen is general, when but this resistance value is changed to other values, also can ask for reference value by other time slots.
As mentioned above, according to the present invention, with resistance value, static capacity, and the electrical specification value of induction coefficient is connected in resonant tank with operation continually varying variable element, make the resonance characteristics continually varying simultaneously at specific time slot, detect signal level or signal phase corresponding to this variation, in addition, at other time slot, the element that will have same value with the maximal value that above-mentioned variable element is obtained through operation is connected in resonant tank, detect at this moment signal level or signal phase, at other time slot, the element that will have same value with the minimum value that above-mentioned variable element is obtained through operation is connected in resonant tank, formation detect at this moment signal level or the structure of signal phase, so, even signal level or signal bits, also can correctly detect the continuous quantity corresponding to operation along with the height or the degree of tilt of position indicator change.
In the present invention, can utilize 1 recovery to signal respectively and carry out detection and the maximum reference value of continuous quantity and the detection of minimum reference value of 1 continuous quantity, can under quick sampling speed, correctly detect continuous quantity corresponding to operation.
Claims (2)
1. position detecting device, by the position indicator that possesses the resonant tank that comprises coil and capacitor at least, and the graphic tablet of the coordinate figure by asking for the indicating positions that this position indicator produces to this position indicator transmitting-receiving electromagnetic wave constitutes, produce the electromagnetic wave that comprises given timing information from graphic tablet, from the induced voltage that in the resonant tank that receives this electromagnetic position indicator, produces, extract described given timing information, in the particular time-slot of the timing information given based on this, correspondingly operate the resonance characteristics of the resonant tank of control position indicator, in this specific time slot, detection is characterized in that from the electromagnetic phase place or the intensity of the resonant tank generation of position indicator:
In position indicator, be provided with:
The 1st resonance characteristics control device, its control make the interior numerical value of given variable range of its this resonance characteristics that becomes corresponding continued operation amount based on the resonance characteristics of the resonant tank in the 1st particular time-slot of given timing information;
The 2nd resonance characteristics control device, its control makes the maximal value in its given variable range that becomes this resonance characteristics based on the resonance characteristics of the resonant tank in the 2nd particular time-slot of given timing information;
The 3rd resonance characteristics control device, its control makes the minimum value in its given variable range that becomes this resonance characteristics based on the resonance characteristics of the resonant tank in the 3rd particular time-slot of given timing information;
In graphic tablet, be provided with:
The detected value acquisition device, it is obtained interior electromagnetic phase place or the intensity that produces from the resonant tank of position indicator of described the 1st, the 2nd, the 3rd particular time-slot respectively as the 1st, the 2nd, the 3rd detected value;
Processing apparatus, with the described the 2nd and of the 3rd detected value as the upper limit, another is as lower limit, by making described the 1st detected value corresponding to from the described scope that is limited to lower limit, thereby asks for the continued operation amount.
2. position indicator, possesses the resonant tank that comprises coil and capacitor at least, by comprising the electromagnetic wave of the given timing information that produces from graphic tablet, extract this given timing information the induced voltage that in resonant tank, produces, in the particular time-slot of the timing information given based on this, correspondingly the resonance characteristics of operation control resonant tank is characterized in that: be provided with
The 1st resonance characteristics control device, its control make the interior numerical value of given variable range of its this resonance characteristics that becomes corresponding continued operation amount based on the resonance characteristics of the resonant tank in the 1st particular time-slot of given timing information;
The 2nd resonance characteristics control device, its control makes the maximal value in its given variable range that becomes this resonance characteristics based on the resonance characteristics of the resonant tank in the 2nd particular time-slot of given timing information;
The 3rd resonance characteristics control device, its control makes the minimum value in its given variable range that becomes this resonance characteristics based on the resonance characteristics of the resonant tank in the 3rd particular time-slot of given timing information.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB02143266XA CN1307520C (en) | 2002-09-25 | 2002-09-25 | Position detection apparatus and its position indicator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB02143266XA CN1307520C (en) | 2002-09-25 | 2002-09-25 | Position detection apparatus and its position indicator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1485794A CN1485794A (en) | 2004-03-31 |
| CN1307520C true CN1307520C (en) | 2007-03-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB02143266XA Expired - Fee Related CN1307520C (en) | 2002-09-25 | 2002-09-25 | Position detection apparatus and its position indicator |
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| Country | Link |
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| CN (1) | CN1307520C (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4872113B2 (en) * | 2007-09-10 | 2012-02-08 | 株式会社ワコム | Position detection device |
| CN102096487B (en) * | 2009-12-10 | 2014-09-17 | 太瀚科技股份有限公司 | Integrated touch input device and touch recognition method |
| CN102591480B (en) * | 2011-01-06 | 2017-10-13 | 崔伟 | A kind of action sensor and action method for detecting |
| CN107077225B (en) * | 2014-10-06 | 2019-12-17 | 株式会社和冠 | Position indicator |
| JP6713772B2 (en) * | 2016-01-06 | 2020-06-24 | 株式会社ワコム | Position indicator and position indicating method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4670627A (en) * | 1984-07-23 | 1987-06-02 | Seiko Instruments & Electronics Ltd. | Coordinate reading device |
| US4868351A (en) * | 1987-03-09 | 1989-09-19 | Mitsubishi Denki Kabushiki Kaisha | Input pen data input tablet |
| US4929934A (en) * | 1987-09-28 | 1990-05-29 | Oki Electric Industry Co., Ltd. | Pressure-sensitive input apparatus |
| CN1246681A (en) * | 1998-06-22 | 2000-03-08 | 株式会社华科姆 | Digital convertex coordinate input system for digit |
-
2002
- 2002-09-25 CN CNB02143266XA patent/CN1307520C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4670627A (en) * | 1984-07-23 | 1987-06-02 | Seiko Instruments & Electronics Ltd. | Coordinate reading device |
| US4868351A (en) * | 1987-03-09 | 1989-09-19 | Mitsubishi Denki Kabushiki Kaisha | Input pen data input tablet |
| US4929934A (en) * | 1987-09-28 | 1990-05-29 | Oki Electric Industry Co., Ltd. | Pressure-sensitive input apparatus |
| CN1246681A (en) * | 1998-06-22 | 2000-03-08 | 株式会社华科姆 | Digital convertex coordinate input system for digit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1485794A (en) | 2004-03-31 |
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