JPS5894069A - Coordinate detector - Google Patents

Abstract

PURPOSE:To ensure an output of a coordinate data having continuity in response to the shift of a pressing point, by obtaining the deviation between the coordinate data which are successively extracted from the shift of the pressing point and defining only the coordinate data having a deviation less than the prescribed value as a continuous data. CONSTITUTION:The 1st and 2nd resistance films 1 and 2 which are set opposite to each other centering on a spacer. The driving voltage +V is connected via a transistor (TR) Q1 to an electrode 1A of the film 1, and an earth potential is connected to an electrode 1B via a TR Q2 respectively. While the voltage +V is connected via a TR Q3 to an electrode 2A of the film 2, and an earth potential is connected to an electrode 2B via a TR Q4. Then TRs Q1-Q4 are controlled alternately with the outputs of output terminals Q and -Q of an FF1. The signals read out of the films 1 and 2 are converted into the digital value through an A/D converter ADC and then applied to a processor unit PU. A deviation is obtained between the coordinate value data which are read out by an operation processor CPU of the unit PU, and only the coordinate data having a deviation less than the prescribed value is used as a continuous data. Thus a continuous coordinate data is delivered in response to the shift of a pressing 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. The present invention relates to a coordinate detection device using two resistive films arranged vertically and horizontally at predetermined intervals and facing each other with a dot-shaped spacer in between.

Conventionally, as disclosed in, for example, Japanese Unexamined Patent Publication No. 56-11580, one of two resistive films placed facing each other with a frame-shaped spacer in between is pressed to bring the two resistive films into contact with each other. 2. Description of the Related Art A coordinate detection device is known that obtains the coordinates of a pressed point of a suppressor such as an edge marking tool by detecting the electric potential at a contact point, and thereby inputs handwritten characters or graphic capes into a computer.

However, in the above-mentioned coordinate detection device, since the two resistive films are insulated from each other by a frame-shaped spacer, if the 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 FIG. 1 (1), two resistive films 1 and 2 are arranged facing each other with dot-shaped spacers 3 arranged vertically and horizontally at predetermined intervals as objects to be suppressed, and one resistive film is There is a structure in which both resistive films are brought into point contact in the area where the spacer 3 is absent, as shown in the cross-sectional view of FIG. 1(b).

In detecting the pressing point position of the suppressing body and outputting its coordinate data,
Similar to the principle of the detection operation disclosed in the publication,
The operation of applying a predetermined voltage in the X-axis direction of the second resistive film 1 using electrodes 1M and 1B, and the application of a predetermined voltage in the Y-axis direction of the second resistive film 2 using electrodes 2 and 2B. The potentials at the contact points of both resistive membranes are taken out alternately from the electrodes of the resistive membrane with no voltage applied, and these potentials are converted into digital values and calculated on the X-axis and Y-axis of the pressing point.
It is configured to be output as axis coordinate data.

Therefore, in a coordinate detection device using such a suppressed body, the area of the suppressed body can be increased, and it is particularly suitable for inputting handwritten drawings into a computer.

However, since the spacer is in the form of a point, the point contact area at the pressing point is affected by fluctuations in the suppression strength, as shown in Figure 1 (c) or (
As shown in the cross-sectional view d), various costs are incurred, and the potential at the contact point taken out from one of the resistive films varies accordingly. For example, even if the pressing point is moved continuously in a straight line as shown by symbol M in Fig. 1(e), the potential of the contact point will fluctuate depending on the size of the point contact area. The problem is that the coordinate data of the axes becomes discontinuous, and the computer side recognizes or displays it as the coordinate data of a curve as shown by symbol 1 in FIG. 1 (.).

The present invention was made to solve these drawbacks, and its purpose is to provide continuous coordinate data that follows the movement of the pressed point even if there are fluctuations in the suppression strength or point contact state. An object of the present invention is to provide a coordinate detection device capable of outputting coordinates.

Ninthly, the present invention calculates the deviation between the coordinate data that is sequentially extracted as the pressing point moves, treats only the coordinate data whose deviation is less than a predetermined value as continuous coordinate data, and treats the other coordinate data as continuous coordinate data. This is the case with Ton, who has decided to ignore it as something abnormal.

Note that in this specification, coordinate data that is determined to be continuous among coordinate data strings that are sequentially extracted is defined as the true value of the coordinate data and used for explanation.

Hereinafter, the present invention will be described in detail based on illustrated embodiments.

FIG. 2 is a block diagram showing one embodiment of the present invention. In the figure, an electrode 1B of the first resistive film 1 is connected to a positive drive voltage (+Vs) via a transistor Q1, and one electrode 1B is connected to a ground potential via a transistor Qs. Further, the electrode 2A of the second resistive film 2 is connected to a positive driving voltage (+V1) K via a transistor Qs, and the one electrode 2B is connected to ground potential via a transistor Q4.

Conduction and non-conduction are controlled by signals YD and XD for alternate application of drive voltages output from these transistors Q* A-Q a ld , the output terminal (q) of the flip-flop FFI, and ◎, respectively. It is configured.

The flip-flop FF is used to alternately switch the application of the driving voltage to the two resistive films 1.2, and
It consists of type flip-flops. At its data input terminal (2) is a processor.

A channel switching signal C)1B is input from the unit PU, and an inverter I is input to the clock input terminal (CK).
A signal C8, which is an inverted 1 of the chip select signal from the NVIK, is input.

Therefore, the flip-flop FFl has a logic "0" when the channel switching signal CHs of logic 11# is input.
When a chip select signal of 100 is generated from the processor unit Pυ, a signal YD of logic "1" and a signal XD of logic "Om" are output after the falling timing of this chip select signal CI. , d When the channel/channel switching signal CH8 of logic "1" is input and 100 occurs in the chip select signal of logic "0", transistors Qs and Q4 are made conductive,
A driving voltage (vl) is applied to the second resistive film 2 to output a signal that generates a potential gradient in the y-axis direction as indicated by the arrow.

On the other hand, when the flip-flop FF is input with the channel switching signal CH8 of logic 10#, the channel select signal of logic "Om" and i is the processor unit PU.
, the logic "0" signal YD and the logic "m1" signal XD are output after the fall υ timing of the chip select signal τ1.In other words, the flip-flop FF outputs the logic "0#" signal XD. Signal CI'
When 1g is input and i is generated by a chip select signal of logic "0", transistors Q1 and Q- are made conductive, a driving voltage (V, ) is applied to the first resistive film 1, and S shown by an arrow is applied. Outputs a signal that creates an axial potential gradient.

Therefore, by alternately switching the channel switching signal 01B sent from the processor unit PU between logic "1" and logic 10'', A predetermined potential gradient can be generated alternately in the y
When a potential gradient is generated in the axial direction, the position of the pressing point in the y-axis direction is set at a level corresponding to the position of the pressing point in the y-axis direction via the contact point of both resistive films and the electrode 1B of one of the resistive films 1. On the other hand, when a potential gradient is generated in the X-axis direction, the potential signal vy at the pressing point
Adjust the axial position to the contact point of both resistive films and one resistive film 2.
can be extracted as a potential signal vx at a level corresponding to the pressing point position in the S-axis direction through the electrode 2B.

Potential signals vy and vx at levels corresponding to the coordinate positions of the pressed point in the y-axis and Integral circuit I via swl
It is input to TG,,ITG,.

Here, the two resistive films 1 and 2 are connected to the integration circuit ITGI because the drive voltage (vl) is applied alternately.

The earth potential is directly applied to IT (h, which slows down the integration operation, which in turn slows down the conversion speed of the potential signals VY and VX into digital values. To prevent this, switch sw
l > and 8W1 are provided.

That is, in this type of coordinate detection device, the potential signal VY#v
Generally, an integrating circuit including a capacitor is added to the input stage of the D converter to remove ripple and noise components contained in x and convert the average value of the potential signals vy and vx into digital values. However, in such a configuration, the ground potential on the drive voltage application side is connected to the integrating circuit I.
TGI or! When input immediately to TG, the capacitors C of these integrating circuits are discharged due to the input of the ground potential, and the potential signals 7 and V taken out from each resistor film are
When integrating X, charging must be restarted from ground potential. Therefore, the integration operation is delayed by the time required to charge the ground potential to the level of the potential signals vY and vx, and the speed of conversion to coordinate data is slowed down.

For this purpose, the switch 8W1 is connected to the flip-flop tri
The output signal YD is "1', and the output signal YD is "1', and the output signal YD is "1', and the output signal YD is "1'", and

Only when the chip select signal C8 output from the antagonist Gl is "1", the output signal of the antagonist Gl is turned on (closed state), and the driving voltage (vI) is applied to the first resistive film 1. At other times, it is in the off state, and the ground potential is controlled so as not to be directly applied to the input of the integrating circuit ITG. i
9. The output signal XD of the switch awsa flip-flop FFI is 11", and the chip select signal C8 is 11".
``Only when this happens, the output signal of the antgame G1 turns on state!I (closed state), and the driving voltage (
vI) is in an off state, and the ground potential is controlled so as not to be applied directly to the input of the integrating circuit ITG.

As a result, the integration circuit ZTGl#I including the capacitor C
TG performs an integral operation on the potential signals vy, vx only during the generation period of the chip select signal CI, and holds the integrated value until a new potential signal vy, vx is applied at the timing when the next chip select signal CB is generated. I come to do it.

In this case, in a normal suppression operation, the potential signal vy,
Since the rate of change in the level of vx, is relatively small, the integration circuits ITGI, ITG.

Capacitor C at instantaneously receives new potential signals Vy,v
If K is charged to the level of x, the integral operation can be completed very quickly.

In this way, the potential signals vY' and VX'd integrated in the integration circuits I TGI and ITG, and the two-channel D conversion inputs Ca1l and CH2 are integrated.
It is input to the converter DC.

When the channel switching signal CHIi is “
When the chip select signal τi becomes a 11" signal, the potential signal vY' input to the expanded first channel D converter input CHI is selected. Convert.

Then, when the conversion operation is completed after a certain period of time, the logic “
Along with the conversion end signal 100 for θ'', the converted value is output as y-axis coordinate data Y with a serial data structure.
When the channel switching signal CH8 is 11m, the potential signal vx' input to the mu-D conversion input CH2 of the second channel is selected, and after i becomes the 11m signal with the chip select signal, this signal vx' is handled. Convert to a digital value. Then, the converted value is output as five-axis coordinate data X together with the conversion end signal moc.

The signal is inverted by VsK and sent to the processor unit PU. Then, upon receiving the signal IOC, the processor unit Pυ reads the X-axis and y-axis coordinate data X, Y in a serial data configuration.

Now, the processor unit (PUi) is composed of the arithmetic processing unit CPU, program memory MIM, etc., and performs a series of controls such as reading the coordinate data input from the MuD converter MuDC and determining its continuity. It is output as coordinate data that accurately follows the movement of a point, but is it possible to start a mourning program that performs a control like Jin? .

Logic “om” suppression detection signal 8N8 is output from the output terminal (2) of
This is done by inputting jin.

That is, the driving voltage (
When a pressing operation is started with an arbitrary tie voltage while applying Vl) alternately, potential signals vy and vx corresponding to this pressing point position are taken out, and among these, vx is applied to the switch Bw3. Integral circuit through! On the other hand, the voltage is divided by the resistors B1 and R, and is input to the gate of the transistor Qs.

The transistor Qs becomes conductive when the suppression operation on the resistive film is started and the level of the potential signal VX exceeds a predetermined value, and outputs a 10" detection signal 8Nsm indicating that the suppression operation has started from its collector output. The detection signal 80" of 10" output from the external transistor Qm is supplied to the data input terminal (2) of the D-type flip-flip FF, and is taken in and output at the rising edge of the chip select signal CI. Suppression detection signal 8 of logic “Om” from terminal Q
Output as NB. Therefore, if the chip select signal is made to generate 100 in a relatively short cycle, the suppression detection signal lNi1 is immediately generated after the suppression operation on the resistive film.
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 activated.

By the way, when detecting that the resistive film is pressed,
If a relatively large current is caused to flow through the resistive film 1 by applying the drive voltage (Vs), the potential gradient in the resistive film 1 will become steep, and the potential signal V may vary depending on the position of the pressing point.
The level of X changes drastically. As a result, depending on how the discrimination level in the transistor Qm is determined, a suppression operation may be performed and it may become impossible to distinguish between good and good results. Therefore, before the suppression operation is detected, a small current is passed through the resistive film 1 to make the potential gradient gentle so that a high-level potential signal VX can be obtained no matter where the pressure is applied. In other words, transistor Q■ is replaced by transistor °
It is made non-conductive by the output signal (“0” signal) of Q-,
A driving voltage (v
By applying only the positive potential of l), the entire potential of this resistive film 1 is shifted to the positive potential side. As a result, the resistive film 1 is connected to the transistor Qs and the integrating circuit I? It is configured to flow a minute current determined by the impedance on the input side of G and the resistance value of the resistive film 1. In this case, the conversion end signal OC of the MDC converter MDC is used as the signal that makes the transistor Q@ conductive. As can be understood already, after the conversion operation is completed, the MuD converter MuDC is in a state of waiting for the input of the new potential signal vy or the new potential signal Vx, so the conversion end signal KOC is input to the inverter IN.
If the transistor Q is inverted and controlled by Vs, one resistive film is always shifted to the positive potential side after the conversion operation is completed.

Therefore, if a suppression operation is performed in this state, a high-level potential signal VX will be obtained no matter where the pressure is applied.
Even if the discrimination level in transistor Q- is set a little high, transistor Qm is reliably conductive. In other words, it is possible to reliably detect that a suppression operation has been performed. As a result, the program in the processor enit can be reliably started following the suppression operation. In this case, since the discrimination level of transistor Q can be set high, disturbance noise may cause an erroneous suppression detection signal -N-
It also has the effect of preventing the occurrence of.

Note that since the pressure point is detected as a pair of coordinates in the 1st axis and the y-axis direction, the transistor 4b for detecting that the suppression operation is performed receives the potential signal vx in the X-axis direction.
It is provided only in @1 and has a d foot. This is the transistor Q.
The same applies to

Here, with reference to the time chart shown in FIG.
The operation in the trench where K is input will be summarized and explained.

First, at time #t1, when 1 becomes "O" in the chip select signal shown in FIG. , the MuD converter MuDO goes into a standby state. At this time, if the channel switching signal CBs changes to "0" as shown in <c) in the same figure, the output signal Y of the flip-flop FFI
As shown in (d) of the same figure, one output signal XD becomes a 11''' signal as shown in (-)K of the same figure. drive voltage (vl
) is applied. In addition, if the signal However, at this time, the rather large potential signal VX of the electrode 21Ka of the second resistive film 1, which has not yet been subjected to the suppression operation, does not appear.

Next, at time ts, i is 10 by the chip select signal.
When the signal returns to 1, the switch IW= is turned off. At the same time, the MuD converter MuDC starts the conversion operation. However, at this time, the potential signal VX' to be converted is not input at time 1. Then, a logic "o'o" conversion end signal f is outputted, and coordinate data Y of all "Om" is outputted. At this time jsK, the conversion end signal becomes 101, so that the transistor q becomes conductive, and the transistor Qs, which had been conductive due to the signal XD, becomes non-conductive. As a result, the potential of the entire first resistor Iota is shifted to the positive potential side, and accordingly, the signal VY taken out from the electrode 1B also changes during the generation period of the conversion end signal 1f, as shown in Part 3 II (f). is shifted to a positive potential.

When the pressing operation is started at time tsa in this state, a high-level potential signal VX is taken out from the electrode 2s as shown in Figure 3 and applied to the base of the transistor Q- via the resistance blade 1. be done.

As a result, a signal 8N8m as shown in FIG. 3(b) is output from the collector output of the transistor Qs.

After this, at time t4, ■ is “0” in the chip select signal.
When the signal 11118 is changed to the signal 11118, it is taken into the flip-flop IFFm at the falling timing of the input signal, and the output thereof is outputted as the suppression detection signal INII as shown in FIG. 3 (1). Okay, the processor enit PU starts a program for reading the coordinates of the press point.

On the other hand, since the suppression operation is started at time tea and the chip select signal is generated from time t4 to tI,
The potential signal VX corresponding to the axial position is the integral circuit I? G
input to s. Accordingly, the integrator circuit I'rGl receives input signals vx tt4-1. Integrate in Figure 3 (j
) and supplies it to the D conversion input CB'lK of the second channel of the D converter MDC. Then, the MDC converter MDC receives the channel switching signal C.
The potential signal vx' supplied to the MuD conversion input of the second channel is selected on the condition that Ha is 1", and the time 1 when 1 returns to the "1" signal by the chip select signal. The conversion operation of this potential signal vx' into a digital value is started by the tie electric nog.Then, when the conversion operation is completed at time t@ after a certain period of time, the conversion end signal lf is
is set to 0'' signal to notify the processor unit Pυ that the conversion operation has been completed.As a result, the processor unit Pυ reads the conversion output of the MuD converter MuDC, that is, the coordinate data X of the l axis. conduct.

On the other hand, coordinate data X of the processor unit PUFiJ axis
Before reading, time 1. , the channel switching signal CHI is set to 11" signal. This means that at the next time t1, the application of the driving voltage (vl) is switched to the first resistor/film 1.
This is for switching from the resistive film 2 to the second resistive film 2. Therefore, when the chip select signal C8 changes to the mOm signal at time t1, a flip occurs at this falling timing.
The output signal you''' of the flop FFI changes to a 1m signal, and one output signal XD changes to a 10'' signal. This is K
Okay, now the driving voltage (vl) is applied to the second resistive film 2.

At the same time, the time t when 1 is generated in the chip select signal
! ~1. At this point, the switch 8Wl is turned on. Therefore, the potential signal vY corresponding to the pressing point in the y-axis direction taken out from the electrode 1B of the first resistive film 1 is input to the integrating circuit tTGt via this switch swl. Then, the integrator circuit I TO, holds this input potential signal vY as a chip select signal at the occurrence stop edge 4, and outputs it to the input potential signal vY.
It is supplied to the 5-way conversion input CHI of the first channel of the converter DC. Accordingly, at time t@~t・, the signal VY
' is converted into a digital value Km. Then, upon generation of the conversion end signal EOC, it is read into the processor unit Pυ.

The above operations are repeated while the suppression operation continues. With this, coordinate data of the pressing point can be obtained as a pair of x@ and y axes.

Next, the coordinate data ZD output from the MuD converter MuDC
The operation of the processor unit Pυ which reads the data and determines its continuity and outputs it as coordinate data that faithfully follows the movement of the pressed point will be explained with reference to the flowchart shown in FIG.

Note that the flowchart shown in Figure 4 is constructed on the premise that the locus of the pressed point will be displayed on the screen of the display device based on the finally obtained nine coordinate data, so the locus of the pressed point will not be displayed. Explain the operation up to this point.

In Fig. 4, first step 1 is to determine whether the setting of conditions such as the display color of the trajectory of the press point and its background color has been completed.
00. If the various conditions for this display have been set, the process moves to trajectory display processing.

In the trajectory display process, first, in step 101, the flag FLG is set to "on".Flag FLG
is for determining whether the coordinate data ZD read from the MuD cost converter MuDC is the first one at the stage of entering the trajectory display process, and at the stage of entering the trajectory display process, "OH" to indicate that this is the first coordinate data. When the setting of the flag FLG is completed, the routine proceeds to the ".CMLL 81i) 181" routine shown in step 102.

rCALL ilg) [lEJ routine determines whether the suppression detection signal 8Na is 101. First, as shown in the next step 1020, the signal 8N8 is
If the suppression detection signal 8NS becomes a 10m signal due to the suppression operation on the resistive film, the process proceeds to the next step 10B, the rCALLD mutem wing IADJ routine, and the muD converter mutem Reads the l-axis and y-axis coordinate data X, Y from the DC, and processes it in the processing unit c
It is stored in the first register built into pυ. Thereafter, in steps 1030 and 1031, the currently read l-axis and y-axis coordinate data X and Y are also stored in the register @2 as coordinate data X' and Y'. This is 1. Locus number of the press point - 41t Use the coordinate data X and Y read once as the base point, set the newly read current coordinate data X and Y as the target point, and connect these base points and the target point with a straight lineK This is because the information is displayed in the correct manner. That is, since there is no data that should serve as the base point for displaying 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 initial coordinate data x, Y is narrowed down in this way, rCALL11CNII in the next step 104
The program moves to the J routine, and in step 1040, it is determined again whether the pressure detection signal 11 is 10. Here, if the suppression detection signal 8N8 is 0,
In order to read the coordinate data x and Y of the next press point, the process moves to the rCALL DA'rm 111CADJ routine of step 105. - Then, in step 1050, new S@p- coordinate data X is read, and then in step 1051
The y-axis coordinate data Y is read in, and these coordinate data x and Y are stored in the first register.

Next, when reading of this second coordinate data is completed, the process proceeds to step 1■, where the flag FLG is set to 10.
Determine whether it is H1. That is, step 1
It is determined by the flag FLG whether the coordinate data X, Y read in the rCALL D mode RIADJ routine of 0B is the first one. If flag F
If LG is "011", the process advances to step 101, and in this step, the coordinate data X' read first and stored in the second register, and the coordinate data X' stored in the first register containing the bladder second. Find the deviation from data X,
It is determined whether the deviation is a value of '511' (in hexadecimal notation) or more. Similarly, the deviation between the first coordinate data Y' and the second coordinate data Y is determined, and it is determined whether the deviation is a value of '5B' or more.As a result of this determination, the deviation is If it is “5H” or more, the process returns from step 10F to step 102 and rCAL is performed again.
L Performs processing of the 81N8KJ routine.

In this case, the coordinate data x', y' stored in the second register is invalidated, and the coordinate data x, Y stored in the first register is read in the second register. It will now be treated as a. That is,
Previously read coordinate data x'.

If the deviation between Y' and the coordinate data X and Y read into the new nine on the same coordinate axis is "5H" or more, the previously read coordinate data z1. y/ is regarded as discontinuous data due to fluctuations in pressing strength, and is the latest coordinate data x stored in the first register in step 1030;
The coordinate data x1 that Y read last time. It is stored in the second register as Y/.

However, as a result of the determination in step 107, if the deviation between the first read coordinate data z/, y/ and the second read coordinate data X, Y is "less than IV," these data It is assumed that there is Hiro-continuity, and the process proceeds to the next step 1011, where the coordinate data x/, y/ is converted to correspond to the pixel coordinates and coordinates on the screen of the display device.After this, in step 1011, the flag is set. FL
G is set to 180H#, 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', 07' and cx, cy converted into pixel coordinates are
is transferred to output registers /RG3 and RG4. After this, the process proceeds to step 113, where 'CALL
LINIE' routine is deepened, data cx',
cy' and data CX.

Pixels at coordinate positions indicated by 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 with a straight line and displayed as the locus of the pressed point, then in step 114, the stored data cx of the register RG4,
cy is transferred to register RG3. This means that when the pixel coordinates corresponding to the third pressing point are specified, the second
This is to set the pixel coordinates corresponding to the second pressed point □ as a new base point for displaying the locus.

When the process of step 114 is completed, the next step 11
Oite 75 on 5 FLG 2! l! '801 ('Ka
After tL9, the process returns to step 1030, and the 21st coordinate data X stored in the first register is stored in the second register as data X'. Then, in the next step, the second coordinate data Y stored in the first register is stored in the second register as data Y'.

This is K, move to the state to read the third coordinate data, step 104C) rCALL IIINIIICJ
The routine is executed again. Then, the suppression detection signal 8N
If S is 'o''t', rcitt in step 105;

The ``DA'rAIImD'' routine is executed and the third new coordinate data x, y is read in steps 10s@ and 1051.

This third new coordinate data is stored in the first register.

Next, in step 108, the flag FLG is set to 1OR'
It is determined whether or not. At this time, since the flag PLO is set to "8011" in step Its, the process advances to the next step 110, and this time, the second coordinate data x', y' and the third coordinate data x, Y of the broom are It is determined whether the deviation of is greater than or equal to '5H'. if,
If the deviation is less than '5B', these coordinate data are considered to be continuous.Then, the third coordinate data X, Y newly read in step 111 is displayed on the screen of the display device. The pixel coordinates are converted to correspond to the pixel coordinates, and the corresponding pixel coordinates and the pixel coordinates corresponding to the third pressing point are connected with a straight line and displayed.

The coordinate data sequentially read in this way is displayed as a locus that follows the movement of the suppression point after the continuity of the previous and subsequent coordinate data is determined. In other words, the deviation is “5H”
Coordinate data that is less than 1 is output to the display device as being correct and continuous (true value of the coordinate data).

However, as a result of the determination in step 110, the second coordinate data x1. Yl and the third coordinate data X,
If the deviation from Y on the same coordinate axis is 5B" or more, the process advances from step 110 to step 116, where it is determined whether the flag FLG is greater than "811". At this time, the flag FLG is larger than "811". Since FLG Fi'80B', the process proceeds to step 111, and in ζ this 7-lag FL
GO contents are incremented.

That is, the flag FLG is "8" in step 111.
111 "K" is updated. After this, without skipping step 1030, the process returns to step 104 and "CALLLLN" is updated again.
III J routine is executed. Then, in step IOS, the fourth coordinate data X.

Y is read. Next, the process proceeds to step 11@ via step 106, and at ζζ, the deviation between the coordinate data x', y' stored in the second register and the coordinate data x, Y stored in the first register is determined. It is determined whether the number is "5B" or more. That is, here Hiro step 11
1 to rcALl, llN3' routine, the contents of the second register are not updated.
The second coordinate data is stored as the true value of the previously read coordinate data. Therefore, in step 110, the second read coordinate data z/, Yl and the fourth
The difference between the newly inserted coordinate data X and Y is “5”.
It will be determined whether or not it is greater than or equal to H''.

As a result of this determination, if the deviation between the two is less than 15B'', the process proceeds from step 110 to step 111, where the conversion of the fourth coordinate data It is displayed as a trajectory. Therefore, in this case, the third coordinate data is invalid.

However, as a result of the determination in step tta, if the deviation between the second and fourth coordinate data is '5H15B again, the process returns to step 116, where the flag FL is set.
It is determined whether G is larger than "81B". At the time of jin, the flag FLG is '81H', so step 11
1, where it is incremented to rFLG="8211". After this, step 104. as in the previous case. After the process 105 is performed, the fifth coordinate data x, Y is read in steps 105G and 1051 and stored in the first register.

Then, the process proceeds to step 110 via step 1011, and again the coordinate data x stored in the first register is
, y (that is, the fifth coordinate data) and the coordinate data x' stored in the register of building 2.

The deviation from y/ (i.e., the second coordinate data) is "
It is determined whether or not the value is greater than or equal to "sn".

As a result of this determination, if the deviation between the two is "5B" or more, the process advances to step 116 and the flag FLG is determined again. At this time, since the flag FLG is already "82I'l"K, go to step 11@m and set H'+so next time.
After that, the process returns to step IQ3G and step 1031, and the fifth coordinate data X, Y is stored in the second register as a new true value. Processing is executed.

That is, in steps 105 to 1051, the 6th coordinate data x and Y are newly read, and then in step 11G, the 511th coordinate data x' is read.

The deviation between Y' and the 6th coordinate data x, Y is 15H1
It is determined whether or not the value is greater than or equal to the value. As a result of this determination, the deviation is '5'.
If it is less than 11', in step 111, the sixth read coordinate data x, Y is converted into pixel coordinates, and the locus is displayed in the same manner as in the previous case. In this case, since the pixel coordinates corresponding to the second pressing point are stored in the third register RG3, the pixel coordinates corresponding to the second pressing point and the pixel coordinates corresponding to the sixth pressing point The coordinates are connected by direct spinning. That is, if the previous coordinate data is used three times in a row, the next coordinate data is determined as the true value and output for displaying the locus.

In this way, even if the continuity with the previous coordinate data is denied in step 110, if this occurs three times in a row, the n+11th coordinate data is output as correct, so that the pressed point coordinates can be changed. It is possible to prevent the coordinate data from being dropped when the range of change is large, and it is possible to display a locus that faithfully follows the movement of the pressing point.

Now, suppression operations are not necessarily performed continuously in time, but are sometimes 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, this flowchart includes a software timer means for identifying the time interval of the suppression operation.

That is, in step 102G, the suppression detection signal 8N
It is determined whether B is 10m or not, but signal 11NB is “O”.
If it is not m, it is assumed that the suppression operation has been performed and the process proceeds to step 1021, where the value T of the soft timer is
MD is set to "FF" (hexadecimal display). After this,
In step 1022, it is determined again whether the signal 8N8 is "0", and if it is not ``0'', the next step 1023
Then, at this ζ, the value of soft tie i MD is ′″0
"K", that is, whether a predetermined time has elapsed. As a result of this determination, if TMD is not 101, the value of the soft timer is decremented in step 1Q24) (TMD-1)L, and the process returns to step 1G22. Then, in this step 1022, the signal 8 is turned on again.
It is determined whether N11 is "01" or not. If the main signal BN1 is "10" at this stage, it is assumed that the suppression operation has not been performed yet and the process proceeds to step 1023→1o24.
→The process of 1Q22 is repeated, and during this repetition, the value TMD of the soft tie i is decreased by ``1''. As a result, if the value TMD of the soft timer becomes 10'', it is assumed that no suppression operation has been performed for a predetermined period of time, and step 1
The problem returns to step 09 of determining the initial conditions.

However, if the suppression operation is performed before the value TMD of the soft timer reaches "0", the process moves from step 1022 to the rc:ALL, DATA RIADJ routine of step 163, and the coordinate data (X, YC) is sequentially read.

Therefore, when successive suppression operations are performed, the coordinate data X and Y are successively read in sequence as described above. However, for two suppression operations performed at a predetermined time interval, the process returns to step 100 after the first suppression operation is completed, and the reading of the coordinate data X, Y for the next suppression operation sets the 7-lag FLG to 'on'. As a result, coordinate data X and Y for suppression operations that are temporally widely separated are output to the display device while being distinguished from each other, and can be displayed as completely independent trajectories.

The same applies to steps 1040 to 1Q44.

As explained above, the present invention calculates the deviation between the coordinate data sequentially taken out as the pressing point moves, treats only the coordinate data whose deviation is less than a predetermined value as continuous coordinate data, and are ignored as abnormal.

Therefore, even if there is a variation in the suppression strength or a variation in the point contact state, it is possible to output continuous coordinate data that follows the movement of the pressed point.

[Brief explanation of the drawing]

Figure 1 (&) is a diagram showing the structure of the pressed body, Figure 1 (b)
〜(・) is a diagram for explaining the drawbacks of the conventional technology, FIG. 2 is a block diagram showing an embodiment of the present invention, FIG. 3 is a time chart for explaining its operation, and the fourth factor is coordinate data. 2 is a flowchart up to displaying a trajectory based on . 1.2.O...Resistive film, FFhFFs-...Φ flip-flop, MuGl, Muam...eII antgame), g
wl, sw, *-@- switch, Ql~Q@-...
Transistor, ITGI, ITG,...integrator circuit,
MuDC/fist ΦΦmu D converter, pu@...processor unit), CPU-...arithmetic processing unit, MICM...-
·memory. Patent Applicant: ShinNippon Electric Co., Ltd. Agent: Masaki Yamakawa (and one other person) Procedural Amendment (To the Commissioner of the Japan Patent Office B"f'n 'I' 5)
7. h, -781, Display of 78 items 1982 Patent Application No. (Tsu 2348 2, Hill) q Name (Atsuoumi A Yade Nagaka 3, Amendr + Relationship with JF Patent Applicant Name (Name) 49 Shin Nippon Electric Co., Ltd. Japan Eij March 30, 1978 (0 details 1'; no change, l: (no change in content) CZ) engraving of drawings (change in content) none)

Claims (1)

[Claims] The first and second resistive films are arranged opposite to each other with dot-shaped spacers arranged vertically and horizontally at predetermined intervals, and the first resistive film is arranged 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 suppression of one resistive film are taken out alternately from the voltage application electrode of the resistive film on the side to which no voltage is applied, and these potential signals are converted into digital values. In a coordinate detection device that outputs coordinate data of the X-axis and Y-axis of the pressing point of the resistive film, the coordinate data that is sequentially extracted as the pressing point continuously moves is input, and the coordinates retrieved at a new time are input. calculation means for calculating the deviation between the data and the coordinate data set as the true value before that; a comparison means for detecting whether the deviation is within a predetermined value; A coordinate detection device comprising an output means for outputting only coordinate data as a true value of new single target data.