JPS5894072A - Coordinate detector - Google Patents

Abstract

PURPOSE:To discriminate a coordinate data obtained by the pressing operations which are discontinuous in terms of time and to deliver a coordinate data in faithfully response to the shift of the pressure point, by extracting successively the discontinuity of a coordinate data train due to the change of the pressing intensity of the resistance film and then comparing a deviation between the data and the prescribed value. CONSTITUTION:The potential levels detected with the continuous shift of the pressure points of the resistance films 1 and 2 are successively extracted by an A/D converter ADC. A coordinate data is applied to an arithmetic processor CPU of a processor unit PU to obtain a deviation between the coordinate data. The discontinuity of a coordinate data train due to the discontinuous pressing time of the films 1 and 2 is monitored by a transistor TRQ5, an FF2, etc. Then the coordinate data obtaned by the discontinuous pressing operation of the films 1 and 2 is discriminated by the unit PU. Thus the discontinuity of the coordinate data due to a change of the pressing intensity is avoided to deliver a locus coordinate data in faithfully response to the shift of the pressure point.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a coordinate detection device that detects the position of a pressed point on a suppressed object and outputs coordinate data on the X-axis and Y-axis indicating the pressed point position, and in particular, The present invention relates to a coordinate detection device using two resistive films facing each other with dot-like spacers arranged vertically and horizontally at predetermined intervals.

Conventionally, as disclosed in, for example, Japanese Patent Publication No. 11580/1983, one of two resistive films placed facing each other with a frame-shaped spacer in between is pressed to bring both resistive films into contact with each other. By detecting the potential at this contact point]
2. Description of the Related Art A coordinate detecting device is known that obtains the coordinates of a pressed point of a suppressing body such as a writing instrument, and uses the coordinates to input figures in a handwritten character to a computer.

However, in the above-mentioned coordinate detection device, the insulation between the two resistive films is done by a frame-shaped spacer, and if the zero area of the resistive film is made large, the resistive film will bend due to its own weight, which is an inconvenience. be.

Therefore, as shown in ts1 diagram (a), 2
Two resistive films 1 and 2t-1 are arranged vertically and horizontally at a predetermined interval, electrical current is distributed facing each other via nine-dot spacers 3, and one resistive film is pressed, as shown in the cross-sectional view of Figure 1. K so that both resistive films are brought into point contact in the area where there is no space tS.
There are some structures that have this structure.

The method of detecting the pressing point position of the suppressing body and outputting its coordinate data is described in the above-mentioned Japanese Patent Application Laid-Open No. 56-11580.
Similar to the first layer of the detection operation disclosed in the issue, the i-th
The operation of applying a predetermined voltage to o# in the X-axis direction of the resistive film 1 using electrodes 1m and 1m, and the operation of applying a predetermined voltage in the Y-axis direction of the second resistor I[2 using electrodes 2m and 21 The operation of applying a voltage is performed alternately, the potential at the contact point of both resistive films is taken out alternately from the electrode of the resistive film on the side where no voltage is applied, and these potentials are converted into digital values to It is configured to be output as axis coordinate data. Therefore,
In a nine-coordinate detection device using such a suppressed body, the area of the suppressed body can be widened, and this is particularly suitable for inputting handwritten notes, drawings, etc. into a computer.

In this case, since the spacer is dot-shaped, even if the pressing point is moved continuously, the M mark data of the pressing point becomes time series data of time intervals related to the moving speed of the pressing point. Therefore, when displaying the trajectory of a pressure point using such a time-series coordinate data string, the computer interpolates the coordinates of the gap corresponding to one blind spot spacer based on the adjacent coordinate data. It is necessary to display the trajectory of the pressed point as a continuous trajectory using this calculated value and a time-series coordinate data string.

In such a coordinate detection device, the suppression operation itself is often performed temporally discontinuously, for example, when drawing two mutually independent lines.

However, in conventional i, the coordinate data obtained by moving the pressing point is simply output in time series. It is not possible to identify whether the time interval between the coordinate data in the coordinate data string is the time interval when moving the point-shaped spacer part, or whether it is due to the temporal discontinuity of the line pressing operation itself, and 1 There is a drawback that the book is displayed as a series of 9-, making it impossible to faithfully follow the suppression operation and display the 9-track.

On the other hand, since the spacer is in the form of a point, the point contact area at the pressing point changes from (d
) as shown in the cross-sectional view, and as a result, the potential of the contact point taken out from one of the resistive films changes, for example, the pressure point is continuously moved in a straight line as shown in the symbol M in Figure 1 (・). Even if you move it like a nine, is it a point? The electric potential at the contact point changes depending on the size of the contact area, and the coordinate data of the X and Y axes becomes discontinuous.
It has the disadvantage that it is recognized or displayed as coordinate data of a seagull line as shown in symbol 1.

The present invention has been made to solve these drawbacks, and its purpose is to identify coordinate data in temporally discontinuous pressing operations, and furthermore, to identify discontinuous phenomena in coordinate data caused by fluctuations in suppression strength. It is an object of the present invention to provide a nine-coordinate detection device that can faithfully follow the movement of a pressing point and output coordinate data of nine loci.

To this end, the present invention calculates the deviation between the coordinate data that is sequentially output as aS as the pressing point moves, and treats only the coordinate data whose deviation is less than a predetermined value as continuous coordinate data, and leaves the others as uncontinuous coordinate data. In addition to ignoring it as normal, a timer means is provided to monitor the generation time interval of a potential signal generated at the contact point of both resistive films due to the pressure of the resistive film. ] The output coordinate data is output as coordinate data resulting from continuous movement of the pressing point, and the coordinate data deposited in a state exceeding a predetermined value is output as coordinate data resulting from discontinuous movement of the pressing point. .

In this specification, among the sequentially extracted coordinate data strings, nine coordinate data that is determined to be correct and normal and follows the movement of the pressing point will be defined as the true value of the coordinate data for the sake of explanation. use.

Hereinafter, the present invention will be explained in detail based on an illustrative example.

The second wJ is a block diagram showing one embodiment of the present invention IIAIP1. In the figure, the electrode 1 of the first resistive film 1 is connected to a positive driving voltage (+Vr) via a transistor Q1, and one of the electrodes is connected to the ground potential via a transistor Q3. . Also, the voltage of the second resistive film 2 is
2m is connected to the positive drive voltage (+V1) through the transistor Qs.
), and one voltage @21 is connected to ground potential via transistor Q4.

These transistors 91 to Q4 are connected to signals YD, XD, and K for alternate application of drive voltages output from output terminals 9) and (2) of the 7-rip, 7-p tube FFr, respectively.
The structure is such that conduction and non-conduction are controlled.

The flip-flop FF5a is for alternately switching the application of drive voltage to the two resistors 111.2,
It is composed of four D-lid flips. The channel switching signal CHI is input from the line processor unit PU to the data input terminal e), and the chip select signal C8 is inverted by the inverter lNV*, and the good signal C1 is input to the input terminal (CK). has been done.

Therefore, when the channel switching signal CHI of the logic s%lI is input to the 7-lip 7-bit FFI, if the chip select signal CB of the logic IO is generated from the processor unit PU, this chip select signal CB is After the falling edge timing, a signal YDsP of logic % t I and a signal XD of logic 10' are output. That is, the 7-rip 7-4 FFs receives the logic l channel switching signal CHB.
is input, and the chip select signal C8 of logic s%oI
occurs, transistors Qs and q4 are made conductive, and Kz.

Apply the driving voltage (vl) to the resistor 1 [2, and y as indicated by the arrow.
A signal is output that creates an axial potential gradient.

On the other hand, 7 Rip 7 Four Tsubu FF! When the channel select signal c8 of logic 0 is generated from the processor unit PH while the channel switching signal CH8 of logic %□I is input, the logic becomes Call signal YD and argument 11
% 11 signal XD is output. That is, when the logic %o #o channel switching signal 018 is input to the 7-rip 70-tube FF1 and the chip select signal i of logic 10' is generated, the transistors Q1 and Q3 are made conductive, and the resistor 1 of the tuna 1 [IK drive A voltage (vl) is applied to output a signal that generates a potential gradient in the X-axis direction as indicated by the arrow.

Therefore, the channel switching signal CH sent from the PU (processor 22) is logic jj %s I and logic 10'.
By alternately switching between the resistors 1 and 1), a desired potential gradient can be alternately generated in the t-axis direction of the first resistor 11X1 and in the Y-axis direction of the second resistive film. As a result, if you press an arbitrary coordinate position on one resistive film to bring both resistive films into point contact, when a potential gradient is generated in the γ-axis direction, the position of the pressed point in one axis direction can be changed to both resistors. Through the contact point of the genus and the voltage m1lli of one resistor III, it is possible to output *n as a potential signal vY at a level corresponding to the pressing point position in the 1st axis direction, and conversely, a potential gradient is generated in the X-axis direction. When the pressure is applied, the position of the pressing point in the X-axis direction is transmitted through the contact point of both resistors and the electrode 2m of one resistor film, and a 9-level potential signal is generated corresponding to the pressing point position in the X-axis direction. Taken as VX
I can put it out.

Nine levels of potential signals vy, V are generated corresponding to the coordinate positions of the pressed point taken out in this way in the 1-axis and X-axis directions.
The X Fi signals are input to the integrating circuits ITGs and ITG* via switches 8Ws and 8W, respectively.

Here, since the driving voltage (vl) is applied alternately to the two resistive films 1 and 2, the integrating circuit ITGl+ITG
Since the sKa ground potential is directly applied, the integration operation becomes uneven, and as a result, the conversion speed of the potential signals VY and VX into digital values becomes uneven. To prevent this, switches SWs and SWl are provided. That is, in this type of coordinate detection device, the potential signal VY.

It is common to add an integrating circuit including a capacitor to the input stage of the D converter to remove noise components from the ripple components included in VX and convert the average value of the potential signals VY and VX into digital values. However, in such a configuration, if the ground potential on the drive voltage application side is directly input to the integrating circuit ITGI or ITG, the capacitor C of these integrating circuits will The potential signal vy taken out from each resistive film is
When integrating vx, charging must be restarted from ground potential. Therefore, the integration operation is delayed by the time required to charge from the ground potential to the level of the potential signals VY and VX, and the speed of conversion to coordinate data slows down.

In this rounding, switch 5Wxtt7 lip 7-tup FF
1 output signal YD is 11', and inverter INV1
Maybe the chip select signal CI that is output is 11:? Only when the AND gate AG1 is turned on (closed state II) by the output signal, the driving voltage (vl) is applied to the first resistive film 1.
is in an off state when the voltage is being applied, and the ground potential is controlled so as not to be directly applied to the human power of the integrating circuit ITGs. Before, switch SW proverb is flip 7vx knob FFs
The output signal XD is vkl', and the chip select signal 01
Only when 1 is 1, it is turned on (closed state) by the AGsO output signal, and when the drive voltage (Vl) is applied to the second resistor I2, it is turned off, and the ground potential is It is controlled so that it is not directly applied to the input of the integrating circuit ITGI.

Accordingly, the integrating circuit I TG* including the capacitor C
*ITGI integrates the potential signals vy and vx only during the generation period of the chip select signal C8, and holds the integrated value until new potential signals vy and vx are applied at the timing when the next chip select signal C8 is generated. I come to do it. In this case, in normal suppression operation, the potential signal V
Rounding and integrating circuit with relatively small rate of change in Y and VX levels! Since the capacitor C in the ITG proverb is instantly charged to the level of the new potential signals vy and vx, the integration operation can be completed extremely quickly.

The nine potential signals vY' and vx' integrated in the integrating circuits ITGI and ITG in this manner are input to the D converter MDCK having two channels of D converter inputs CH1 and 0H2.

The channel switching signal CHI of the channel switching signal CHI is %6.
When it is 1, the potential signal input to the D conversion input CHI of the first channel is selected as ', and after the chip select signal CII becomes a signal 11', this signal is converted into a corresponding digital value. Then, when the conversion operation is completed after a certain period of time, the logic %()IO conversion end signal EOC
At the same time, the converted value is output as y-axis coordinate data Y having a serial data structure. In addition, the channel switching signal C
When H8 is 11', the second channel's D conversion input C
Select the potential signal vx' input to Hx, and convert this signal vkK whose chip select signal C11 has become a 11' signal to a corresponding digital value (and convert the converted value to the conversion end signal EOC). Both are output as coordinate data X of the VCX axis.

In this case, the conversion end signal EOC is the inverter I NV
.

EOC is inverted by processor unit) and sent to PU
Upon receiving the meeting, the coordinate data X, Y of the X-axis and y-axis of the serial data structure is read.

Now, the processor PU is composed of an arithmetic processing unit CPU and a programmable memory MEM, and performs AD conversion and
It performs a series of controls such as reading the coordinate data input from the DC and determining its continuity, accurately follows the movement of the pressing point, and outputs it as Kuza Keyaki de, - Yu. 7 steps to start a program for control
This is performed by inputting the suppression detection signal SN8 of logic 10' from the output terminal (Q) of the 0-tube FF stack.

That is, the driving voltage (
When a suppression operation is started at an arbitrary timing while applying voltage (vl) alternately, nine potential signals VY and VX are taken out corresponding to the position of the pressing point, among which the signal vx stock switch gWm The voltage is inputted to the integrating circuit ITGt via the resistors R1 and Rm, and the voltage is divided by the resistors R1 and Rm and inputted to the base of the transistor Q10.

The transistor Qm becomes conductive when the suppressing operation on the resistive film is started and the level of the potential signal vx exceeds a predetermined value, and outputs a detection signal BH3 of 10' indicating that the suppressing operation has started from its correction output. . The detection signal 8NII of %Ol output from the external transistor Qi is a D-type flip-flop FF! The signal is supplied to the data input terminal (D) of the chip select signal C8, and is picked up by the rising p-tie of the chip select signal C8 and outputted to the output terminal q as the suppression detection signal 8N8 of logic 10'. Therefore, if the chip select signal CB is generated at a relatively short period, the suppression detection signal 8N can be generated immediately after the suppression operation on the resistive film.
g can be obtained, and a program that performs processing such as reading the coordinate data X and Y and determining the continuity thereof can be started. By the way, when the VC detects that the resistive film is pressed, if a relatively large current is applied to the resistor Ill by applying the driving voltage (vl),
The potential gradient in the resistive film 1 is steep], and the level of the electric fIt flaw signal vX changes significantly depending on the position of the pressing point. As a result, depending on how the discrimination level in transistor Qm is determined, it may become impossible to identify that a suppression operation has been performed. Therefore, before detecting the suppression operation, a small current is applied to the resistive film 1.
A high-level potential signal VX is obtained.

In other words, the transistor Qs) is rendered non-conductive by the range J/Q@0 output signal (marked 10'), and the resistor 1[IK
applies only the positive potential of the driving voltage (Vi) by the transistor Qt to shift the entire potential of this resistor ill to the positive potential side. As a result, resistive film IK) transistor Q
i, the impedance on the input side of the integrating circuit ITGt, and the resistance value of the resistor 1 [1]. In this case, the conversion end signal goc of the AD converter MDC is used as the signal that turns on the transistor Q. So that you can understand RK,
After the conversion operation is completed, the AD converter ADC is in a state of waiting for input of the new potential signal vyotashavx, so this conversion end signal IOC is inverted by the inverter INVs and the transistor Q- is inverted. If controlled, the resistor 111 will always be shifted to the positive potential side after the conversion operation is completed. Therefore, when a suppression operation is performed in H shape II, a high-level potential signal VX is obtained no matter where the pressure is applied, and even if the discrimination level of transistor Qm is set slightly high, the transistor Q
s conducts. In other words, it is possible to reliably detect people who have been subjected to suppression operations. As a result, it is possible to reliably start the program in the four processors following the suppression operation. In the case of ζO, rounding allows the discrimination level of the transistor Qs to be set to a high value, and also has the effect of preventing generation of an erroneous suppression detection signal 8Ng due to external noise.

Note that since the coordinates of the pressing point are detected as a pair in the X-axis and y-axis directions, the transistor Qm for detecting the point where the suppression operation has been performed uses the potential signal VX in the X-axis direction.
If it is installed only on the side, it will be sufficient. The same applies to transistor Q.

-Here, with reference to the time chart shown in Figure 3,
and y-axis coordinate data x, Y is the processor unit) P
The operation up to input to υ will be summarized and explained.

First, time t! When the chip select signal C8 shown in (a) of the same figure becomes %Ol, the conversion end signal aOC ((b) of the same figure) returns to the %11 signal at this falling edge, and the D converter ADC goes into a standby state. becomes. At this time, the channel switching signal CHI9 becomes 0 as shown in FIG.
, the output signal YD of the flip 70 tube FFI is a %oI scratch signal as shown in (d) of the same figure, and the output signal XD of the other is %111! as shown in (・) of the same figure.
number. As a result, the driving voltage (v
l) is applied. 9, signal XD is 11'
During the generation period of the step-left signal C8, a 1 signal is output from AGm and the switch SW is turned on as shown in the same figure.However, at this time, the When the suppression operation is not performed, the potential signal VX does not appear on the electrode 2BK of the second resistor 812.Next, at time t3], when the chip select signal C8 returns to 0, the switch 8Wg is turned off. At the same time, the AD converter ADC starts the conversion operation.However, at this time, the potential signal vx' to be converted is
is not input, the logical %OI at time tsK
At the same time as outputting the conversion end signal IOC of
Output the coordinate data Y of I.

At this time, when the conversion end signal becomes 10', the transistor Q@ becomes conductive, and the companion transistor Q3, which is made conductive by the signal XD, becomes non-conductive. As a result, the entire potential of the first resistive film 1 is shifted to the positive potential side, and accordingly, the signal V taken out from the electrode 1]1 is shifted to the positive potential side.
As shown in FIG. 3C, Y is shifted to a positive potential during the generation period of the conversion end signal (2).

In this state, when the pressing operation is started at time ts4, the electrode! As shown in FIG. 3(f), a high-level potential signal VX is output from MR) and applied to the base of transistor Qi via resistor R1. by this,
A signal BNB as shown in FIG. 3 is output from the collector output of the transistor Qi. After this, when the chip select signal CI changes to a 10' signal at time t4, the signal BH3 becomes 7' at this falling edge.
Lip 70 Tubu F? The output is outputted as a suppression detection signal BNB as shown in FIG.

On the other hand, since the suppression operation is started at time 1 and the chip select signal C8 is generated from time t4 to ts,
The potential signal vx corresponding to the position in the axial direction is sent to the integrator circuit ITG.
6 is input to j, thereby integrating circuit I TG s
The line input signal VX is integrated from t4 onwards, and the result is shown in Fig. 3 (
A potential signal vx' as shown in j) is outputted and supplied to the AD converter ADC12) second channel AD conversion input 7JCH2. Then, the D converter ^DC selects the potential signal vx' supplied to the AD conversion input of the second channel on the condition that the channel switching signal CH8 is t 1 N, and outputs the chip select signal. At the time ti when C8 returns to the Jl signal, the conversion operation of the potential signal vx' into a digital value is started. When the conversion operation ends at time ts after a certain period of time, the conversion end signal decoration is set to 10' signal, and the processor 22)P
Notify UK that the conversion operation has been completed. Accordingly, the processor unit Pυ reads the conversion output of the MuD converter MuDC, that is, the X-axis coordinate data KO.

On the other hand, processor Nitsu) PUiJx axis coordinate data
Before reading , the channel switching signal CHII is set to the %11 signal at time tI. This is rounding to switch the application of the drive voltage (vl) from the resistive film 1 @1 to the second resistor 112 at the next time t1. Therefore, when the chip select signal C8 changes to a 10' signal at time ty, 7 bits are generated at this falling edge timing. The output signal YD of the rough 02FF1 changes to the 11' signal, and one output signal XD changes to the %OI signal. This time), the driving voltage (vl) is applied to the second resistor fIX2.
is now applied. At the same time, at time ty to ts when the chip select signal C8 is generated, the switch 8
Wt is turned on. Therefore, the potential signal vyH1 corresponding to the pressing point in the γ-axis direction taken out from the voltage 1klB of the first resistor 1[1 is inputted to the integrating circuit ITGI via this switch 8Wt. Then, the integrator circuit ITG1q integrates this input potential signal vY as the chip select signal C8 is generated, holds the integrated signal VY' even after the generation of the signal C8 has stopped, and outputs the integrated signal VY' to the first channel of the AD exchanger DCo. AD conversion input cHIK is supplied. As a result, time ts
~t-, the signal vY' is assigned a digital value of 4Ci. Then, upon generation of the conversion end signal EOC, the conversion signal is input to the processor unit Pυ.

The above-mentioned operation is repeated as long as the pressing operation continues. In this way, it is possible to obtain the data of the pressed point on a pair of X and Y axes.

Next, the coordinate data ZD output from the ADi converter ADC
Figure 4 shows the operation of the FEZ, which determines the amount of pressure and its continuity and outputs it as a coordinate theme that faithfully follows the movement of the pressing point.
Refer to and explain.

Note that the 7n-chart shown in FIG. 4 is constructed on the premise that the traces of the pressing points will be displayed on the screen of the display device based on the finally obtained nine-coordinate data.
The operation in E, where the trajectory of the pressed point is displayed, will be explained.

@ In Figure 4, first, the setting of conditions such as the display color of the trajectory of the pressed point and its background color is completed, and step 1 is to determine whether it is a friend or not.
00. If the settings for the ninth condition for displaying Jin are completed, the process moves to trajectory display processing.

In the trajectory display process, first in step 101, the 7-lag FLG is set to %□H#. Flag FL
G is Jl! read from the AD converter ADC! Target data Z
This is to determine whether D is the first one at the stage when entering the trajectory display process, and is set to OH at the ninth stage after entering the trajectory display process 1iK, indicating that it is the first coordinate data. . When the setting of the 7-lag FLG is completed, the routine proceeds to the routine "rCALL8 EN8Σ" shown in step 102.

rCALL BENBEJ routine is the suppression detection signal S
It is determined whether N8 is 10'K or not. First, it is determined whether signal 8NB is 101 as shown in the next step 102G. If the suppression detection signal 8Ng has the 'θ' signal Ke due to the suppression operation on the resistive film, rCALLDATA R in the next step 10m
Proceed to the EADJ routine, insert the X-axis and 1-axis coordinate data x, Y from the AD converter DC, and input the coordinate data
It is stored in the first register built into the PU. Thereafter, in steps 1030 and 1031, the currently read X-axis and γ-axis coordinate data X and Y are also stored in the second register as coordinate data X' and r. This is the coordinate data X that read the locus of the pressing point last time,
Current zakki data x with Y as the base point and new Kflt included
, yt-target point, and these base points and the target point are connected with a straight line to be displayed.

That is, since there is no data that should serve as the base point for rounding to display the trajectory for the first read coordinate data X and Y, this first coordinate data is set as the base point and target point of the trajectory.

When the reading of the first coordinate data X, Y is completed in this way, the next step 1040r CALL gRNB
1$9 to BJ Luten, and in step 104@, it is determined again whether the suppression detection signal 8NI is %gI. Here, if the suppression detection signal aNI is 0, r CALL DATA READJ in step 105 is performed to read the coordinate data X, Yt of the next pressing point.
Move on to the routine. Then, in step 1050, the new X-axis coordinate data X is stored, and then in step 105
1, the y-axis coordinate data Yt- is read and these coordinate data x and Y are stored in the tenth register.

Next, when reading of this second coordinate data is completed, the process proceeds to step 106, and the 75-g FLG is set to 1 at the bottom.
It is determined whether it is 0H'. That is, step 1010rCALL DAT'ARMD'routine K
It is determined whether the coordinate data x, Y read by TiP is the first one or not based on the f near lag FLG. If 7U/FLG is 10H', the process proceeds to step 107, and in this step, the coordinate data X' that is read first and stored in the second register, and the coordinate data The deviation from the coordinate data X is determined, and it is determined whether the deviation is a value of '5H' (in hexadecimal notation) or more. Similarly, the deviation between the first coordinate data Y' of Jg and the second coordinate data Y is determined, and it is determined whether the deviation is a value of %s n 1 or more. As a result of this determination, the deviation is '5H.
"If the result is above, the process returns from step 107 to step 102, and the rc*u, gENSz J routine is processed again. In this case, the coordinate data x', y' stored in the second register is invalidated, and the coordinate data stored in the first register is read by the second tuna.
X and Y will be processed as the first one.

That is, the previously read coordinate data x'.

If the deviation between r and the newly loaded coordinate data X, Y on the same coordinate axis is 5H or more, the previously read coordinate data X', Y' is discontinuous due to fluctuations in pressing strength, etc. In step 1030, the latest coordinate data x, Y stored in the first register is stored in the $2 register as the previously read mm data X', Y'.

However, as a result of the determination in step 107, if the deviation between the coordinate data X', Y' read in the first rattan and the coordinate data x, Y read in the second stripe is less than % sn 1, then these data is assumed to be continuous, and the process proceeds to the next step 108, where the coordinate data! ', Y' are transformed to correspond to pixel coordinates on the screen of the display device.

After this, in step 10, the flag FLG is set to '80.
H', and further, in step 111, the coordinate data x, y (stored in the first register) is converted to correspond to pixel coordinates on the screen of the display device. Then, in the next step 112, the data cx', cy'>YoCX, CY converted to pixel coordinates is output from the output register J/
Transferred to RG3 and RG4. After this, step 1
Proceed to step 13 and here 'CALL LIN'll'
The routine is executed, and the pixels at the coordinate positions indicated by data pcx', cY' and data/CX, CY are connected by straight lines and displayed on the screen.

In this way, when the pixels corresponding to the two pressed points are connected by a straight line and displayed as the locus of the pressed points, then in step 114, the stored data cx of the register RG4,
cy is transferred to register RG3.

This means that if the pixel coordinates corresponding to the third pressed point are specified, then the i! This is to set the i coordinates as a reliable base point for displaying the trajectory.

When the process of step 114 is completed, the next step 11
After the flag FLG is set to 180H" in step 5, the process returns to step 1030, and the second coordinate data X stored in the first register is transferred to the 20th register.
’. Then, in the next step, the second coordinate data /Y stored in the first register is
is stored in the second register as data Y'.

This moves the state to read the third coordinate data.9
, the r CALL 8ENSEJ routine of step 104 is executed again. Then, the pressure detection signal 8NB is %
o If it is JF, r CALL in step 105
The DATA READ J routine is executed and in steps 1050 and 1051, the coordinate data x, y of the third new circle is read.

The new coordinate data of the third copper is stored in the register of the tuna.

Next, in step 106, the flag FLG is set to %OH
It is determined whether it is 1 or not. Flag at this time? La
is set to '80H' in step 115, the process advances to the next step 110, and now fFi second coordinate data x/, Y/ and third coordinate data X
One trout with a deviation from IY of 5H or more is identified. If the deviation is less than 5H, these coordinate data are considered to be continuous. Then, the third coordinate data The pixel coordinates corresponding to the third pressing point and the pixel coordinates corresponding to the third pressing point are displayed connected by a straight line.

The coordinate data sequentially read in this way is displayed as 9% II following the movement of the suppression point after the continuity of the previous and subsequent coordinate data is determined. In other words, the deviation is 15H
The coordinate data of the undropped drops are outputted to the display device as mutually continuous and correct values (true values of the coordinate data).

However, as a result of the determination in step 110, the second coordinate data x', y' and the third coordinate data X, Y
If the deviation on the same coordinate axis from ′s u is greater than or equal to 1, then
The process proceeds from step 110 to step 116, where it is determined whether the flag FLG is greater than 811. At this time, since the flag FLG is '80M', the process advances to step 117, where this 7-lag FL
The contents of G are incremented.

That is, the flag FLG is '8' in step 117.
1H "Trap is updated. After this, return to step 104 without going through step 1030 and r CALL・5E
NSE J-Routen is executed. Then, in step 105, the coordinate data X of the fourth honor.

Y is read. Next, the process proceeds to step 110 via step 106, where it is determined that the deviation between the coordinate data JX', Y' stored in the second register and the coordinate data xIY stored in the first register is %. 5
It is determined whether or not it is equal to or higher than H#. In other words, in Komu, since the program returns directly from step 11F to r CALL 81N81CJ Routen, the contents of the second register have not been updated, and the second coordinate data is stored as the true value of the previously read coordinate data. . Therefore, in step 110, the second KWL-included coordinate data
', Y' and the fourth newly read coordinate data x, Y
It is then determined whether the deviation from

As a result of the ζO determination, if the deviation between the two is less than t s n 1, the process proceeds from step 110 to step 111, where the conversion of the fourth series coordinate data It is displayed as a trajectory. Therefore, in the case of Jin, the third coordinate data of Ka is invalid.

However, as a result of the determination in step 110, if the deviation between the second and fourth coordinate data is again %5H1 or more, the process returns to step 116, and at ζζ 7 lag FL
It is determined whether G is larger than 81H. At this time,
The flag FLG is incremented to '82H'J which is '81H'. In this case, as in the previous case, after steps 104 and 105 are performed, step 1
5th coordinate data X at 050 and hi 1051
, Y are read and stored in the first register.

Then, the process proceeds to step 110 via step 106, and the coordinate data x stored in the register of jll is again
, y (ie, the fifth coordinate data) and the coordinate data x' stored in the second register.

The 1 difference from Y' (i.e., the second coordinate data) is '
It is determined whether or not it is greater than or equal to 51'.

As a result of this determination, if the difference between the two is 15H' or more, the process advances to step 116 and the 7-lag FLG is determined again. At this time, since the 7-lag FLGI/i is already in the '82H' trap, 1. Proceed to step 118 and now f is 80H
K is set. After this, the process returns to steps 1030 and 1031], and the fifth Jl! is stored in the register of jI2!
The target data X and Y are stored as new true values, and thereafter, the process continues at step 104 (the escape of each step is executed).

That is, in steps 105 to 1051, 1IN6
The th coordinate data x, Y is newly read, and then in step IIO it is determined whether the deviation between the 5th coordinate data X'IY' and the 6th coordinate data X, Y is 15H1 or more. . As a result of this determination, if the deviation is less than 'SR', in step 111 the sixth read dustbin data X, YOiii is converted into prime coordinates and the locus is displayed in the same manner as in the above case. In this case, since nine pixel coordinates corresponding to the second pressing point are stored in the third register RG3KFi, the pixel coordinates corresponding to the second pressing point and lK pixel corresponding to the sixth pressing point are stored. The coordinates will be connected by a straight line.In other words,
If coordinate data with a deviation of 15H# or more occurs three times in a row with respect to the previous coordinate data as the true value, the next coordinate data will be determined as the true value and output to round off the locus display.

In this way, in 1 step 11G, the continuity with the previous coordinate data is denied, and if this occurs n times, the d1st + 1st coordinate data is output as correct, and the pressed point is It is possible to prevent the coordinate data from degagging when the range of change in the coordinates is large, and it is possible to display a locus that faithfully follows the movement of the pressing point.

Now, the suppression operation is not necessarily performed continuously in time, but may be performed at certain time intervals. In such a case, unless it is determined whether the first suppression operations are continuous or not, the trajectories of the pressing points resulting from two independent suppression operations will be continuous.

Therefore, a software timer means is provided to identify the time interval of this 70-chart KL suppression operation.

That is, in step 1020, the pressure detection signal 8N
It is determined whether B is 10' or not. If the signal 8NB is not 0, it is assumed that no suppression operation has been performed, and the process proceeds to step 1021, where a soft tie is reached at ζζ! The value bO is set to FF (hexadecimal display). After this, in step 1022, it is determined again whether the signal 8N8 is 101 or old, and if it is not %OI, proceed to the next Stella 7' 1023,
At this point, it is determined whether the value TMn of the soft timer is %OIK, that is, whether a predetermined period of time has elapsed. As a result of this determination, if TMI) is not 'OI, the value of the soft timer is decremented (TMD-1)L in step 1024, and the process returns to step 1022. Then, in this step 1022, it is determined again whether the signal 8NS is the turtle OI. And at this stage, 4 signals 5N52! I; If it is not %O#, it is assumed that the suppression operation has not been performed yet, and steps 1023→1024→1
The process of 022 is repeated 9 times, and during this repetition, @TMD of the soft timer is decreased by 11'. As a result,
If the value iMD of the soft timer reaches %61, it is assumed that the suppression operation has not been performed for the predetermined time and the process proceeds to step 100.
The process returns to the initial condition determination step.

But the value of the soft timer! If the pressing operation is performed before the MD reaches %OI, the process moves from step 1022 to the rCALL DATA READ J routine of step 103, and the coordinate data x, y are sequentially read.

Therefore, when continuous suppression operations are performed, F! M4#l data X and Y can be successively read in sequence. However, for two suppression operations separated by a predetermined time interval, the process returns to step 10G after the first pressing operation is completed, and the coordinates D to X for the next pressing operation are
Reading of Y can be started after 9 seconds by setting the flag FLG to % on #. As a result, the data X and Y for temporally distant suppression operations can be distinguished from each other and output to the display device, and can be displayed completely independently as nine trajectories.

This is exactly the same for steps 1040-1044K.

As explained above, the present invention calculates the deviation between the coordinate data that is sequentially outputted as the pressing point moves, and treats only the coordinate data whose deviation is less than a predetermined value as continuous coordinate data. While ignoring others as abnormal,
A timer means is provided for IR viewing the generation time interval of a potential signal generated at the contact point of both resistive films due to the pressure of the resistive film, and the coordinate data extracted when the generation time interval of the potential signal is less than a predetermined value is determined by the pressure. The coordinate data obtained by continuously moving the point is output as coordinate data, and the coordinate data retrieved when the value exceeds a predetermined value is output as the coordinate data obtained by discontinuously moving the pressed point.

For this reason, it is possible to identify coordinate data in temporally discontinuous pressing operations, prevent discontinuous phenomena in coordinate data caused by fluctuations in suppression strength, and create coordinate data of a trajectory that faithfully follows the movement of the pressing point. can be output.

[Brief explanation of drawings]

FIG. 1(a) is a diagram showing the structure of the suppressed body, JII1 diagrams (-) to (-) are diagrams for explaining the conventional drawbacks, and FIG. 2 is a block diagram showing a laughable example of the present invention. Fig. 3 is a time chart for explaining the operation, and Fig. 4 is a 70-day chart until the trajectory is displayed based on the coordinate data. 1.2...Resistive film, FFt*FF snow...7 lip 70 tubes, AGt*AGm...Ant game), 8
Ws, 8W*s @ 1111 switch, Q1~Q
@”11...transistor, rTGl, ITG snow...
・・Integrator circuit, DC・・AD converter, PU・・
-Processor unit, CPU-...computation processing am,
MEM...-Memory. Patent applicant: Shin Nippon Electric Co., Ltd. Dairuto Masaki Yamakawa (name: Ibosu) Procedural amendment (τuta) 1. Indication of the case Showa CL; G year patent application No. [3Z55E” No. 1 24 Name of the application 7 Sokto export 3, Person making the amendment Relationship to the case Patent Applicant name (name)
This one 3) Ken Nippon Electric Co., Ltd. 3. Date of field: 30th month of 1932 (1) Engraving of the details (no changes to the contents) (2) Engraving of the drawings (no changes to the contents)

Claims (1)

[Claims] It has first and second resistive films arranged vertically and horizontally at predetermined intervals and facing each other with a dead center spacer in between, the first resistive film in the X-axis direction and the second resistive film in the Y-axis direction. A voltage is applied alternately to the resistive film, and the potential signals at the contact point of both resistive films due to the pressure applied to one resistive film are taken out alternately from the voltage application electrode of the resistive film on the non-voltage side, and these potential signals are converted into digital values. In a coordinate detection device that exchanges and outputs X-axis and Y-axis coordinate data of a pressing point of a resistive film, the discontinuity of the coordinate data string due to the temporal discontinuity of the suppressing operation of the resistive film is determined by the generation time interval of the potential signal. Coordinate discontinuities in the stranding data string due to fluctuations in the suppression strength of resistance results are sequentially extracted! The second step is to identify the deviation by comparing the deviation between standard data and a predetermined value.
A coordinate detection device comprising identification means.