JPS5894071A - Coordinate detector - Google Patents

Abstract

PURPOSE:To deliver a continuous coordinate data in response to a pressure point and regardless of a change of the pressing intensity, etc., by obtaining a deviation between the coordinate data and defining the n-th data as a continuous coordiante data in case the data of the above-mentioned deviation are continuous in n units. CONSTITUTION:The potential levels VX and VY detected by the continuous shifts of the pressure points of resistance films 1 and 2 are successively extracted by an A/D converter ADC. A deviation between the coordinate data on the new time and the coordinate data which is turned into the genuine value before the new time coordinate data is obtained by an arithmetic processor CPU of a processor unit PU. Whether or not this deviation is within a prescribed range is detected by the PU. Then the fact that the coordinate data are continuous in n units is detected when the deviation obtained by the detection of the PU is larger than the prescribed value. Only the data having a deviation less than the prescribed value is defined as a continuous data, and at the same time the n-th data is used to a continuous coordinate data in case n units of data having the deviation larger than the prescribed value are continuous. Thus a continuous coordinate data is delivered in response to the shift of the pressure point and regardless of a change of the pressing intensity, etc.

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 of 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-shaped spacers arranged vertically and horizontally at predetermined intervals.

Conventionally, as disclosed in, for example, Japanese Patent Application Laid-Open 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. e by detecting the potential at the point of contact
A nine-coordinate detection device is known in which the coordinates of a pressing point of a pressing object such as a marking device are obtained, and handwritten characters, figures, etc. are input into an ambiator using the coordinates.

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 resistive films 11j81t are made wide, there is an inconvenience that the resistive films will bend due to their own weight.

Therefore, as shown in FIG. 1 (1), two resistive films 1 and 2 are used as objects to be suppressed, and electricity is distributed across them through dot-like spacers 3 arranged vertically and horizontally at predetermined intervals, 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 (1+), by pressing .

In detecting the pressing point position of the suppressing body and outputting its coordinate data,
Similar to the principle of detection operation disclosed in the issue, the first
The operation of applying a predetermined voltage in the X-axis direction of the resistive film 1 using electrodes 1 and 1B, and the application of a predetermined voltage in the X-axis direction of the second resistive film using electrodes 2 and 2it. The potentials at the contact points of both resistive films are taken out alternately from the electrode of the resistive film on the non-voltage side, and these potentials are converted into digital values and used as X-axis and Y-axis coordinate data. configured to output. Therefore, in a coordinate detection device using such a suppressed object,
The area of the object to be suppressed can be made large, making it 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 changes due to fluctuations in the pressing strength, as shown in Figure 1 (0) or (
As shown in the cross-sectional view in Figure 1, the potential at the contact point taken out from one of the resistive films varies, and for example, the pressure point is continuously changed as shown in the symbol M in Figure 1. Assuming that the book is moved in a straight line, the potential of the contact point will fluctuate depending on the size of the contact area, and the X-axis,! The coordinate data of the axes becomes discontinuous, and on the computer side, the coordinate data shown in Figure 1 (
It has the disadvantage that it is recognized or displayed as coordinate data of a curve as shown by symbol B in ).

The present invention was developed 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. It is an object of the present invention to provide a coordinate detection device that can be used to detect coordinates.

To this end, the present invention calculates the deviation between the coordinate data that are sequentially extracted as the pressing point moves, and treats only the coordinate data whose deviation is less than a predetermined value as continuous coordinate data, and treats the rest as abnormal coordinate data. In addition, if the deviation exceeds a predetermined value in relation to the sampling speed of the contact point potential and the moving direction and speed of the pressing point, n consecutive coordinate data of deviations greater than the predetermined value are ignored. When the nth
It is a precaution to make the coordinate data of each item continuous coordinate data.

In this specification, the coordinate data that is determined to be continuous among the coordinate data strings that are sequentially output 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 (+Vt) via a transistor Qs, and one electrode 1B is connected to a ground potential via a transistor Qm. Further, the electrode 2M of the second resistive film 2 is connected to a positive drive voltage (+Ls) via a transistor Qs, and one electrode 2B is connected to the ground potential via a transistor Q4.

These transistors 91 to q4 are configured so that conduction and non-conduction are controlled by signals YD and XDIIC for alternate application of drive voltages output from the output terminals (φ and button) of the flip 70 and the button 11, respectively. There is.

The flip 70 knob xxi is for alternately switching the application of the driving voltage to the two resistive films 1 and 2, and n
It consists of type flip-flops. The channel switching signal OHM is input from the processor to the data hexagonal terminal (9), and the clock input terminal (
A signal am obtained by inverting the chip select signal τi is input to the inverter l1iVl.

Therefore, flip 70 tube 1r1 is a no-brainer! When the channel switching signal 0NII of '1' is input, logic 10
″ chip select signal τi is the processor unit Pυ
After the falling timing of this chip select signal am, a logic “1# signal!D” and a logic “Om signal! Output D.

In other words, theory 3 for flip-flop 11! When the channel switching signal Oil of "1'" is input and the chip select signal τi of logic 1o is generated, the transistor Q
s and q4 are made conductive, and a driving voltage (
1) to output a signal that generates a potential gradient in the y-axis direction as indicated by the arrow.

On the other hand, if a channel select signal i with a logic 1 "Om" is generated from the processor unit Phi while the channel switching signal 0■ with a logic "0" in the flip-flop 1y1 is input, the fall timing of this chip select signal i is After ζing, the signal YD of logic “0” and the logic
Outputs 1# signal XD. That is, when the flip-flop L1 receives the channel switching signal OH8 of the logic 1o and generates the chip select signal i of the logic Om, the flip-flop L1 conducts the transistors Qs and Qm, and applies the drive voltage (Vs ) is applied to output a signal that generates a potential gradient in the X-axis direction shown by the arrow.

Therefore, by alternately switching the channel switching signal oia sent from the processor unit Pu between the logic "11" and the logic "0", the A predetermined potential gradient can be generated alternately.Thereby, when an arbitrary coordinate position of one resistive film is pressed and both resistive films are brought into point contact, a potential gradient is generated in the y-axis direction. Sometimes, the position of the pressing point in the y-axis direction can be extracted as a potential signal VY at a level corresponding to the pressing point position in the y-axis direction through the contact point of both resistive films and the electrode 1B of one of the resistive films 1.
Conversely, when generating a potential gradient in the X-axis direction, the position of the pressing point in the X-axis direction is changed to the pressing point position in the X-axis direction via the contact point of both resistive films and the electrode 2B of one of the resistive films 2. It can be extracted as a potential signal Vl of a corresponding level.

The electric potential signal VY, which has a level corresponding to the coordinate position of the pressed point in the y-axis and G1.11G, is input.

Here, since the driving voltage (vl) is alternately applied to the two resistive films 1 and 2, the integrating circuit I'! Gl.

! Since the ground potential is directly applied, the integration operation is slowed down, which in turn slows down the conversion speed of the potential signals Y and VX into digital values. To prevent this, switch 8
W Otori and 8N are provided.

In other words, in this type of coordinate detection device, the potential signal MA! , an integrating circuit including a capacitor is added to the input stage of the MuD converter to remove ripple components and noise components contained in the potential signal MaY, and convert the average value of the potential signal MaY, 7 into a digital value. However, in such a configuration, the ground potential on the drive voltage application side is connected to the integrating circuit I.
! If it is directly input to GlftakeztG=, the capacitor 0 of these integrating circuits will be discharged by the input of the ground potential, and the potential signal 'IF
Y.

During the operation of integrating VX, the photovoltaic must be restarted from ground potential. Therefore, the summation 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 is slowed down.

For this purpose, the switch 8Wl is the output signal of the 7 lip-flop L1! Only when D is 1" and chip select signal CB output from inverter XMv1 is #1m, the output signal of Antogame G1 causes the Zion state (closed state)
When the driving voltage (Ma1) is applied to the first resistive film 1, it is in the off state, and the ground potential is connected to the integrating circuit 12.
It is controlled so that it does not directly apply to the input of 01. t-I
I:,, switch 8W= is the output signal of flip-flop Oi! D is 1# and chip select signal 08 is '1
”, the output signal of the AND gate 5Gl makes the geo/state (closed state), and the driving voltage (V
When s) is applied, it is turned off, and the ground potential is connected to the integrating circuit I! It is controlled so that it does not directly apply to the input of Gs.

As a result, the integrating circuit I'ff1G including the capacitor C
1°I! Gl is a potential signal v! only during the generation period of the chip select signal 08. , X are carried out, and the integrated value is held in the trench where the new potential signals VY and VN are applied to the generation timing of the next chip select signal C8. In this case, in normal suppression operation, the potential signal V
Since the rate of change in the levels of Y and VX is relatively small, the integration circuits ITGI and ITG are used.

The capacitor O at instantaneously receives a new potential signal V! , and the integral operation can be completed extremely quickly.

In this way, integral circuit 1! Gl and! '! The potential signals Y' and VX' integrated at G, are input to a D converter MDO having two channels of D converter inputs OHI and OH2.

The channel switching signal ORB of the program D converter 5Do is θ'
At this time, the potential signal VY' input to the D conversion input Om1 of the first channel is selected, and after the chip select signal i becomes a "1m signal, this signal VY' is converted into a corresponding digital value.

Then, when the conversion operation is completed after a certain period of time, the logic ′
Together with the conversion end signal 200 of ``0'', the converted value is output as y-axis coordinate data I with a serial data structure.Furthermore, when the channel switching signal 01B is ``1'', it is input to the second channel D conversion manual 0112. After the chip select signal n becomes a "1" signal, this signal VX' is converted into a corresponding digital value.Then, the converted value is used as the conversion end signal 200.
It is also output as X-axis coordinate data X.

In this case, the conversion end signal Boo is output from the inverter XWVmK.
Therefore, it is inverted and sent to the processor unit PU.

Then, in response to receiving the signal OC, the processor unit PU reads the X- and Y-axis coordinate data X and Y in a serial data structure.

Well, Bu? The Nanatsusa unit ■ is composed of an arithmetic processing unit OPU, a program memory, etc., and performs a series of controls such as reading the coordinate data input from the MP converter DO and determining its continuity. It is output as coordinate data that accurately follows the movement, but to start the program to perform the control like this, the pressure detection signal 1 of logic “0” is output from the output terminal of the flip-flop 0° (φ). Do it by being input.

That is, the driving voltage (
When a suppression operation is started at an arbitrary timing while applying Vr) alternately, potential signals VY and Vr corresponding to this pressing point position are taken out, but among these, the signal
is connected to the integrator circuit I! via switch lll5. While the voltage is input to G, the voltage is divided by resistor 11 and R, and input to the pace of transistor Qi.

The transistor Qs 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 1i1N8m of '0'' indicating that the pressing operation has started from its collector output. The detection signal BMB of 0" output from this transistor Qi is output from the D-type flip-flop r! The signal is supplied to the data input terminal (D) of the output terminal, taken in at the rising timing of the chip select signal aS, and outputted from the output terminal q as a pressure detection signal 8■ of logic "θ'". Therefore, if the chip select signal n is generated in a relatively short cycle,
Immediately after the suppression operation on the resistive film, the suppression detection signal ■8 can be obtained, and the coordinate data! , Y, and a program that performs processing such as determining the continuity of the data.

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 (vl), 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 Qs is determined, it may become impossible to identify that a suppression operation has been performed. Therefore, before the suppression operation is detected, a minute current is passed through the resistive film 1 to make the potential gradient gentle so that a high-level potential signal MAX can be obtained no matter where the pressure is applied. That is, the transistor Q1 is made non-conductive by the output signal (0'' signal) of the transistor q, and only the positive potential of the drive voltage (Vs) is applied to the resistive film 1 by the transistor Ql, so that the overall potential of the resistive film 1 is changed. Shift to the positive potential side.

This allows a small current determined by the impedance of the input side of the transistor Qs and the integrating circuit l1G1 and the resistance value of the resistive film 1 to flow through the resistive film 1. In this case, the conversion end signal 11 of the MuD converter pO is used as the signal that makes the transistor q6 conductive. As can already be understood, the MuD converter MuDO receives a new potential signal v! after the conversion operation is completed. Alternatively, since the state is to wait for VX to be input, if this conversion end signal 00 is inverted by an inverter xiv to control the transistor Q@, the resistive film 1 is always shifted to the positive potential side. Therefore, if the suppression operation 751 is performed in this state,
A high-level potential signal M1 is obtained no matter where the pressure is applied, and even if the identification level of the transistor Qi is set slightly high, the transistor Qs is reliably turned on. In other words, it is possible to reliably detect that a suppression operation has been performed.

As a result, the program in the processor unit can be reliably started following the suppression operation. In this case, since the levels for each of the transistors q and owk can be set high, there is also the effect of preventing the generation of the pressure detection signal 8■ that is distorted by disturbance noise.

Note that since the coordinates of the pressing point are detected as a pair in the X-axis direction and the y-axis direction, the transistor Qs for detecting that the suppression operation has been performed receives the potential signal VX in the X-axis direction.
It is sufficient to provide it only on the side. This also applies to transistor Q-.

Here, with reference to the time chart shown in Figure 3, coordinate data of the X axis and y axis! , Y is the processor unit) Pυ
The operation up to input is summarized and explained.

First, at time t1, when the chip select signal i shown in the figure (tortoise) becomes "0", the conversion end signal 200 (figure (b)) returns to "1" signal at this falling timing, and the module D The converter DO is in a standby state. At this time, the channel switching signal one becomes "Om" as shown in (0) in the same figure.
Flip-flop! The output signal YD of y1 becomes an mOm signal as shown in (d) in the same figure, and one output signal XD becomes an 818 signal as shown in (•) in the same figure. With this, the driving voltage (Ma1) is applied to the first resistive film 1.
is applied. Also, a signal! When D becomes a "1" signal, a 1" signal is output from the antgame Gl during the generation period of the chip select signal n, and the switch awe is turned on as shown in FIG. 4 (4). However, since the suppression operation has not yet been performed at this time, the potential signal VX does not appear at the electrode 2B of the second resistive film 2.

Next, at time tl, the chip select signal i is 10m.
When it returns to , the switch 811= is in the off state. At the same time, the MUDC converter MUDO is turned on to start the conversion operation. However, at this time, since the potential signal vx' to be converted is not inputted, at time t$, a conversion end signal of logic ``0'' is outputted, and coordinate data Y of 1 all ``θ'' is outputted. At this time tl, the conversion end signal becomes "0", so that the transistor Q becomes conductive, and the transistor (h), which had been conductive due to 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 the signal MA! taken out from the electrode IB is accordingly shifted to the positive potential side. Also, as shown in FIG. 3(f), the conversion end signal 1t
is shifted to the positive potential side during the generation period of .

When the suppression operation is started at time ts4 in this state, a high-level potential signal VX is taken out from the electrode 2B as shown in FIG. 3 (ml) and applied to the pace of the transistor Qs via the resistor R1. Ru.

As a result, a signal 818 as shown in FIG. 3 (Ch) is output from the collector output of the transistor Qi.

After this, at time t4, chip select signal 1 becomes 10''
When the signal changes to the signal 8N8, the signal 8N8 is taken into the flip 70 knob 1h at the falling timing of and is outputted as a pressure detection signal 8 as shown in FIG. 3(1). Accordingly, the processor unit (2) starts a program for reading the coordinates of the pressed point.

On the other hand, since the suppression operation is started at time 1 and the chip select signal CB is generated from time t4 to Xs, switch am is activated.

The potential signal MaX corresponding to the position of the pressing point in the X-axis direction is transmitted through the integrating circuit! '! It is input to Gl. Accordingly, the integrating circuit 1'ff1G integrates the input signal MAX from t4 to tl, and generates a potential signal Vl' as shown in FIG. 3(j).
It outputs 012K and supplies the 5p conversion input 012K of the second channel of the mp converter MUDO. Then, the MuD converter 5Do
selects the potential signal vx' supplied to the mu D conversion input of the second channel on the condition that the channel switching signal cH8 is "L", and the chip select signal returns to "1" signal. The conversion operation of this potential signal vx' into a digital value is started at the tie-up at time tl. When the conversion operation is completed at time t@ after a certain period of time, the conversion end signal is set to 10'' signal to notify the processor unit yu that the conversion operation has been completed. Read data X.

On the other hand, the coordinate data of the PUFiz axis
Prior to reading, the channel switching signal OH& is set to 11" at time tg. This means that at the next time t1, the drive voltage (vl) is applied to the first resistive film 1.
This is for switching from the resistive film 2 to the second resistive film 2. Therefore, when the chip select signal i changes to a "0" signal at time tj, the output signal of the flip-flop 1y1 at this falling timing i! D changes to a 11" signal, and one output signal XDFi changes to a "0" signal. At this time, a driving voltage (V) is applied to the second resistive film 2. At time ty-t when the 1-chip select signal n is generated, the switch all is in the on/off state. Therefore, it corresponds to the pressing point in the y-axis direction taken out from the electrode 1B of the first resistive film 1. The seven potential signals obtained are input to the integrating circuit I!GM via this switch all.Then, the integrating circuit I!G 7 receives this input potential signal VY
is integrated while the chip select signal i is being generated, and the integrated signal VY' is maintained even after the generation of the signal n has stopped.
The first channel of the converter MUDO is supplied with the MUDO conversion manual OHI. Accordingly, when writing the time t..., the signal V
! ' is converted into a digital value Kt'. Then, upon occurrence of the conversion end key signal, the data is read into the processor unit Pυ.

The above-described operations are performed repeatedly while the suppression operation continues. With this, coordinate data of the pressing point can be obtained as a pair of X-axis and y-axis.

Next, the coordinate data ZD output from the 1muD converter MuDo
The operation of the processor unit (PU) 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 FIG. 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 coordinate data, so the locus of the pressed point will be displayed. The operation up to this point will be explained.

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 ffLG is set to 10H2. 7 lag rl,
G is for determining whether the coordinate data ZD read from the MuD converter MuDO is the first 4 at the stage of entering the trajectory display process. ''' to indicate that this is the first coordinate data. When the setting of the flag rLG is completed, the routine proceeds to step 102, ``0 LL II USE M8'' routine.

The "0ALL 81 old I" routine uses the press detection signal ai
It determines whether rs is “0#”.
First, as shown in the next step 1020, the signal 8MS is
It is determined whether or not Om. If the pressure detection signal 5nts becomes a 0" signal due to the pressing operation on the resistive film, the process proceeds to the next step 103 "CmuLLDmu!muR1muD", and from the MuD converter MuDO to the X Read the axis and y-axis coordinate data X, Y, and execute the processing unit 0.
It is stored in the first register built into PtJ.

After this, in steps 1030 and 1031, the currently read X-axis and y-axis coordinate data X and ! the second
The coordinate data is also stored in the registers as coordinate data X' and Y'. This is a press.

The locus of the pressure point is created by using the previously read coordinate data X, Y as the base point, the newly read current coordinate data X, Y as the target point, and connecting these base points and the target point with a straight line. This is because it is displayed. 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 reading of the first 212 coordinate data is completed in this way, the next step 104 is "0mm LLaxiom".
” routine, and in step 1040, it is determined again whether the suppression detection signal 111B is “0”.Here, if the press detection signal awe is “10”, the coordinate data X, In order to read Y, step 105 "Cm LL D mtem R explem D" is executed. Then, in step 1050, new X-axis coordinate data, RIX, is read, and then in step 1051, y-axis coordinate data Y is read, and these coordinate data
, Y are stored in the first register.

Next, when reading of the second coordinate data is completed, the process proceeds to step 106, where the flag IG is set to 'O'.
It is determined whether the signal is H'. That is, step 1
It is determined by the flag YLG whether the coordinate data X, Y read in the routine 03 ``0MULL DMU!MUR EXAM D'' is the first one. If the flag rLG is "OH-", the process advances to step 107, and in this step, the second register is read first.
Find the deviation between the coordinate data X' stored in the register and the coordinate data X read second and stored in the first register. Determine whether there are any. Similarly, the first coordinate data τ' and the second coordinate data! Find the deviation from
If so, return to step 102 from step 107.
Processing of the [OmLL 8118 swearing] routine is performed again.

In this case, the coordinate data 11. stored in the second register. y/ is invalidated, and the coordinate data x, !, which is read second and stored in the first register, is invalidated. will be treated as the first one. That is,
Previously read coordinate data X/.

If the deviation between Y' and the newly read coordinate data X, Y on the same coordinate axis is "5H" or more, the previously read coordinate data z/, y/ is due to fluctuations in suppression strength, etc. The latest coordinate data
, Y is the coordinate data that was read last time ¥Y/ as the second
is stored in the register.

However, as a result of the determination in step 107, if the deviation between the first read coordinate data ¥y/ and the second read coordinate data X, Y is less than 15H', these data are considered to be continuous. The coordinate data 11°Y' is converted so as to correspond to the pixel coordinates on the screen of the display device. After that, in step 109, the flag ffLG is set to "80".
Then, in step 111, the coordinate data X, Y (stored in the first register) is converted to correspond to the pixel coordinates on the screen of the display device. Then, in the next step 112, the data OX', OY' and OX, OY converted into pixel coordinates are transferred to output registers RG3 and RG4. After this, the process proceeds to step 113, where "0 LL LIM
B-routine is executed, data ON', OY'
The pixels at the coordinate positions indicated by the data OX and OY 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 memory data OX of the register IIG4
, OY are transferred to register IIG3. This is the third
When the pixel coordinates corresponding to the th press point are specified,
This is to set the pixel coordinates corresponding to the second pressed point as a new base point for displaying the trajectory.

When the process of step 114 is completed, the next step 11
After the flag ffLG is set to "8011" in step 5, the process returns to step 1030, and the second 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 stored in the first register! is the data to the second register! ’ is stored.

As a result, the state shifts to a state where the third coordinate data is read, and the "0 m rjL 8118 curse" routine of step 104 is executed again. Then, the suppression detection signal aM8 is '
o", step 105 "GALLD!
The ``NmuD'' routine is executed and in steps 1050 and 1051, the third new coordinate data! ,
Y is read.

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

Next, in step 106, flags ffI and G are set to “0”.
It is determined whether or not 1 is ′. At this time, flag I
Since LG is set to "8011" in step 115, the process advances to the next step 110, and this time the deviation between the second coordinate data z/, y/ and the third coordinate data X, Y is ' It is determined whether it is 5H' or more.

If the deviation is less than "5H", these coordinate data are considered to be continuous.

Then, in step 111, the newly read third coordinate data X, Y is converted to correspond to the pixel coordinates on the screen of the display device, and then the second press The pixel coordinates corresponding to the point and the pixel coordinates corresponding to the third pressed point are connected by 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 15M”
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 12 y/ and the third coordinate data X,
If the deviation from Y on the same coordinate axis is greater than or equal to "5H", the process proceeds from step 110 to step 116, in which it is determined whether the flag ILG is greater than "8111". At this time, since the flag rLG is "8011", the process advances to step 11T, where the contents of the flag 'I&Ck are incremented. That is,
The flags ffI and G are 'sin' in step 117.
will be updated. Thereafter, the process returns to step 104 without going through step 1030, and the "0 MUFAL Ill SPOIL" routine is executed again. And further step 1
4th coordinate data in 05! ,! is loaded. Next, the process proceeds to step 110 via step 106, where the coordinate data X/ stored in the second register is acquired.

! ' and the coordinate data stored in the first register! ,
! It is determined whether the deviation from the actual value is "5N" or more.

That is, here step 11T says "0ALI.

81H1l Since the process directly returns to the J routine, the contents of the second register have not been updated, and the second coordinate data is stored as the true value of the previously entered coordinate data. Therefore, in step 110, the second read coordinate data ¥y/ and the fourth newly read coordinate data! , Y is greater than or equal to "5N".

As a result of this determination, if the deviation between the two is less than '5 II', the process proceeds from step 110 to step 111, where the conversion of the fourth coordinate data X and Y to pixel coordinates is executed in the same manner as in the previous case. displayed as a trajectory. Therefore, in this case, the third coordinate data is invalid.

However, as a result of the determination in step 110, if the deviation between the second and fourth coordinate data is again 5 M or more, the process returns to step 116, and the flag r is set at step 116.
2 is determined whether LG is larger than "8111".

At this time, since the flag ffLG is "811", the process advances to step 117 where rxraa-='821'.
Incremented to 1'J. Thereafter, as in the case described above, after the processing of steps 104 and 105 is performed, the fifth coordinate data X, Y is read in steps 1050 and 1051 and stored in the first register.

Then, the process proceeds to step 110 via step 106, and the coordinate data stored in the first register is returned! ,
! (i.e., the fifth coordinate data) and the coordinate data stored in the second register X/, ! ' (that is, the second coordinate data) is determined to be "51" or more.

As a result of this determination, if the difference between the two is ``5 ml'' or more, the process advances to step 118 and the flag IEsQ is determined again. At this time, since the flag rLG is already "82H", the process advances to step 118 and this time it is "82H".
is set to #. After this, the process returns to steps 1030 and 1031, and the fifth coordinate data X, Y are stored in the second register as new true values, and the processing of each step subsequent to step 104 is deepened.

That is, in steps 105 to 1051, the sixth coordinate data X, Y is newly read, and then in step 110, the fifth coordinate data X/ is read.

The deviation between y/ and the 6th coordinate data X, Y is “5H”
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 ``H'', the sixth read coordinate data!, Y is converted into pixel coordinates in step 111, and the locus is displayed in the same manner as in the previous case.In this case, the third Since the pixel coordinates corresponding to the second pressing point are stored in register RG3, the pixel coordinates corresponding to the second pressing point and the pixel coordinates corresponding to the sixth pressing point are connected by a straight line. In other words, if coordinate data with a deviation of 5I[# or more occurs three times in a row with respect to the coordinate data that was the true value last time, the next coordinate data will be determined as the true value and the trajectory will be displayed. Output for.

In this way, even if the continuity with the previous coordinate data is denied in step 110 and the continuity with the previous coordinate data is negative, if this continues n times, the n+1st coordinate data is output as correct. It is possible to prevent the coordinate data from being dropped when the range of change in point coordinates is large, and it is possible to display a locus that faithfully follows the movement of the pressed 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 in this flowchart to identify the time interval of the pressing operation.

That is, in step 1020, the press detection signal aS
It is determined whether or not S is 0'', but the signal 8111 is 101.
Otherwise, it is assumed that no pressing operation has been performed, and the process proceeds to step 1021, where the value of soft tie i! M
D is set to "11'" (hexadecimal representation). After this,
In step 1022, it is determined again whether the signal 8M8 is 10'', and if it is not '0', the process proceeds to the next step IQ2, where the value of the soft timer! It is determined whether (2) is "Om" or not, that is, whether a predetermined time has elapsed.

As a result of this determination,! If MD is not “0”, step 1
At 024, the value of soft tie i is decremented (!M
D-1) L, S? Rough 1022 Hell. Socite,
In this step 1022, the signal 81B is again “0-
Determine whether or not. Also at this stage, the signal s
If ma is "O," it is assumed that vermilion 1 press border has not been made, and the process of steps 1o23 → 1o24 → 1022 is repeated, and during this repetition, the value of 7) / now!MD is l As a result, the soft tie i
When the value TEMD reaches 10''K, it is assumed that the suppression operation for the predetermined period of time has exceeded 0'4.-<, and the process returns to step 100, the initial condition determination step.

However, if the pressing operation is performed before the value TMD of soft tie i becomes "0", the (-0ALL DATA RNADJ) from step 1o22 to step 103
Move to k-chin and continue the coordinate data X and Y sequentially.

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 separated by a predetermined time interval, the process returns to step 100 after the first suppression operation is completed, and the coordinate data for the next suppression operation is calculated. , Y can be read after 7 lags WLG is set to 01'. As a result, the coordinate data X and Y for suppression operations that are temporally widely separated can be displayed as completely independent trajectories as they are distinguished from each other and output to the display panel.

This is exactly the same for steps 1040-1044.

As explained above, the deviation between the coordinate data that is sequentially extracted as the pressing point moves is determined, and only the coordinate data whose deviation is less than a predetermined value is regarded as continuous coordinate data, and the others are considered to be abnormal. In addition, if the deviation exceeds a predetermined value in relation to the sampling speed of the contact point potential and the moving direction and speed of the pressing point, when n pieces of coordinate data with deviations greater than the predetermined value occur consecutively, The n-th coordinate data is made to be continuous coordinate data. .

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. At the same time, it is possible to prevent the coordinate data from being omitted when the range of change in the press point coordinates is large.

[Brief explanation of the drawing]

Figure 1 (&) is a diagram showing the structure of the suppressed body, Figure 1 (b)
~(・) is a diagram for explaining the conventional drawbacks, FIG. 2 is a block diagram showing an embodiment of the present invention, FIG. 3 is a time chart for explaining the operation of 7-, and FIG. This is a 70-chart up to displaying a trajectory based on coordinate data. 1.2...φ resistive film, yyl, ffff,...$!
Flip 70 Tsubu, MuGlemuG,...Fist/And gate, awl, Bwl * --Fist switch, Qs~
Q*”Fist/Transistor, ITGI, I!Gl@・Φ
・Integrator circuit, MuDO・-・MuD converter, PU・Conflict...
Processor unit), 0Ptl---- Arithmetic processing unit,
11-... Mesori. Patent applicant: ShinNippon Electric Co., Ltd. Representative: Masaki Yamakawa (and one other person) - Interpretation letter (no change in content) Procedural amendment (7 documents) To the Commissioner of the Japan Patent Office “1flTn @-, /
4. -1" 1.1f Display Showa 5G Patent Application No. (92-50 No. 2) Item Name

Claims (1)

[Claims] It has first and second resistive films that are arranged opposite to each other with dot-like spacers arranged vertically and horizontally at predetermined intervals, and the resistive film is arranged in the X-axis direction of the first resistive film and in the Yll11 direction of the second resistive film. Voltage is applied alternately, and potential signals at the contact point of both resistive films due to suppression of one resistive film are alternately sent out 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 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 coordinate data is output at a new time. a calculation means for calculating the deviation between the output coordinate data and the coordinate data taken as the true value before that; and a comparison means for detecting whether the deviation is within a predetermined value;
A detection means for detecting n consecutive pieces of coordinate data having a deviation of a predetermined value or more based on the comparison result of the comparison means; and an output means for outputting the n-th coordinate data among the coordinate data whose deviation is equal to or greater than a predetermined value based on the detection result of the detection means as the true value of the new and good coordinate data. Coordinate detection device consisting of