JPH0561593A - Coordinate detector - Google Patents

Abstract

PURPOSE:To provide the coordinate detector which can exactly and stably detect coordinate data without consuming useless processing time or energy even when the surface of a dot spacer or an area near the dot spacer is pressed with light load. CONSTITUTION:Analog switches 4 and 6 selectively and alternately output voltage values corresponding to the (x) and (y) coordinates of a coordinate input part 3 due to resistor sheets 1a and 1b and after the state of pressing the coordinate input part 3 is detected continuously twice in a fixed cycle, the voltage values corresponding to the (x) and (y) coordinates are respectively sampled and stored as last time data. After the last time data are detected, the voltage values corresponding to the (x) and (y) coordinates of the almost same pressed point are respectively sampled and defined as this time data after the fixed cycle and when difference between the last time data and this time data is within an allowable range, the average value of the last time data and this time data is outputted as effective coordinate data.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coordinate detecting device, and more particularly to a coordinate detecting device suitable for use as a two-dimensional coordinate input device for obtaining coordinate data based on a voltage value generated on a resistor sheet by a pressing operation with a finger or the like. It relates to the device.

[0002]

2. Description of the Related Art A two-dimensional coordinate input device using a resistor sheet is for inputting two-dimensional coordinate data by pressing the resistor sheet with a finger or the like, and is inexpensive and easy to operate. It is attracting attention as an input device. FIG. 7 shows a conventional example of this two-dimensional coordinate input device.

In FIG. 7, a conventional coordinate input device has a coordinate input section 3 in which two resistor sheets 1a and 1b are superposed on each other via a dot spacer 2 arranged on the boundary line of a switch, An analog switch 4 that selects the analog information output from the coordinate input section 3 in an alternate manner, an analog switch 6 that connects the voltage source 5 to the coordinate input section 3 in an alternate manner, and an alternate alternation. An A / D converter 7 for converting the selected analog information into digital information,
Main arithmetic and control unit 8 for subjecting a series of information obtained by the A / D converter 7 to predetermined coordinate information by performing certain processing.
And are the basic configurations. The main arithmetic and control unit 8 includes a data collection circuit 9, a sequence control circuit 10, and a data processing unit 1.
1, a pressure detection circuit 12 and an I / O port 13.

The operation of obtaining the x and y coordinate data in the above configuration will be described below. First, the analog switches 4 and 6 are set to the press detection mode, and it is detected at regular intervals T whether the resistor sheets 1a and 1b are pressed. When the pressing is detected, the analog switches 4 and 6 are set to the x-coordinate detection mode, and after a certain time td corresponding to the time delay due to the resistor, the interelectrode capacitance and the interelectrode contact resistance elapses, the A / D converter is set. The analog voltage corresponding to the x coordinate obtained by 7 is converted into digital data. This data is sent to the data collection circuit 9 of the main arithmetic and control unit 8 and held in the x ₀ register 93 of the data collection circuit 9. Next, analog switches 4 and 6
Is set to the y-coordinate detection mode, and data corresponding to the y-coordinate is stored in the y ₀ register 94 in the same manner as in the above case. On the other hand, in the data processing unit 11 of the main arithmetic and control unit 8,
The data stored in the x ₀ register 93 and the y ₀ register 94 is converted into the required resolution, and the data is sent to a higher-level device (not shown).

[0005]

However, in the conventional device having the above-mentioned structure, the analog switches 4 and 6 are set in the coordinate detection modes of x and y, and the pressure detection is performed at intervals of a predetermined time T, and the pressure is detected. After that, since the coordinate data was calculated by mechanically performing A / D conversion at a certain time td, due to inductive noise caused by the human body (operator) and instability of the contact resistance due to the depression of the dot spacers 2. However, there is a problem that an appropriate analog voltage level corresponding to the pressed position cannot be detected.

That is, originally, as shown in FIG. 8A, when the space between the dot spacers 2 is pressed down with an appropriate load, the analog voltage input to the A / D converter 7 is as shown in FIG. 8B. The waveform changes as shown in the figure, and a stable analog voltage level is obtained at the coordinate detection timing t _1, but
As shown in FIG. 9A, when the dot spacer 2 or the vicinity of the dot spacer 2 is pressed with a light load, the contact resistance between the upper and lower resistor sheets 1a and 1b becomes unstable, and A / D conversion is performed. The analog voltage input to the device 7 has an unstable unstable rising waveform as shown in FIG. 7B, the analog voltage at the coordinate detection timing t ₁ is not constant, and an appropriate analog voltage level corresponding to the pressed position is obtained. Could not be detected, causing a malfunction.

In particular, when the dot spacer 2 is pressed, as shown in FIG. 10, the upper and lower resistor sheets 1a,
An approximately circular non-contact area 101 centering on the dot spacer 2 and an annular contact area (a hatched area) 102 surrounding the non-contact area 101 are formed between 1b. At this time, since the finger is pressing the dot spacer 2, the pressing load is unstable, and the annular contact area 1
Since the load applied to 02 is also unstable, the contact resistance is also unstable.

Further, even if the pressing force is uniformly applied to the annular contact area 102, the contact resistance is averaged, and the coordinate data can be calculated by detecting the analog voltage level on the central dot spacer 2. Also, there is a dot spacer 2 at the boundary of the area set as a switch,
Since it cannot be used as data, it cannot be sent to the host device, so the calculated coordinate data must be discarded.
The processing time and power consumption for detection were to be wasted.

Therefore, according to the present invention, even when the dot spacers or the vicinity of the dot spacers are pressed with a light load, accurate and stable coordinate data can be detected without spending unnecessary processing time and power consumption. The purpose is to provide a device.

[0010]

A coordinate detecting device according to the present invention comprises coordinate input means for outputting voltage values respectively corresponding to x and y coordinates of a pressing point on a resistor sheet, and x, x of this coordinate input means. Switching means for alternately and alternately outputting a voltage value corresponding to the y-coordinate, pressure detection means for detecting the pressure state of the coordinate input means in a constant cycle, and pressure detection means for continuously detecting pressure at least twice. After doing x, y
This time, the storage means for storing the data obtained by sampling the voltage values corresponding to the coordinates as the previous data and the data obtained by sampling the voltage values corresponding to the x and y coordinates of the substantially same pressing point after the detection of the previous data and again after a constant period are made. It is equipped with a control means for data and a comparison means for generating a comparison output when the difference between the previous data and the current data is within the allowable range. Only when this comparison output occurs, the average value of the previous data and the current data is calculated. It is configured to be output as valid coordinate data.

Further, the resistor sheet has a structure in which dot spacers are arranged at the boundaries of the switch regions, and is provided with a judging means for judging whether or not the coordinates input by the coordinate input means are the coordinates on the dot spacers. The average value of the previous data and the current data is output as valid coordinate data only when the comparison output is generated and the determination means determines that the coordinates are not on the dot spacers.

Further, in the coordinate detecting device according to the present invention, the pressing detecting means detects the pressing state of the coordinate input means after a predetermined period again after the previous data is detected,
The control means detects the pressure again by the pressure detecting means, and thereafter, the data obtained by sampling the voltage values corresponding to the x and y coordinates of substantially the same pressure point is used as the current data.

[0013]

In the coordinate detecting device according to the present invention, the pressure is detected at a constant cycle, and when the pressure is detected twice, for example, a plurality of voltage values corresponding to the x and y coordinates are sampled after a predetermined time. While averaging each data sampled for each x, y coordinate as the previous data,
In the next cycle, x and y coordinates of the same pressing point are similarly sampled and averaged to make this time data, and it is judged whether the difference between the previous data and this time data is within the allowable fluctuation range, and it is within the allowable range. At this time, the average value of the previous data and the current data of the x and y coordinates is output as effective x and y coordinates.

If the difference between the previous data and the current data of the x and y coordinates is not within the allowable range, or if the dot spacer is pressed even within the allowable range,
Discard the average value of the previous data and the current data for each of the x and y coordinates, until the current pressed state is once released,
The average value of the previous data and the current data is valid only when the difference between the previous data and the current data is within the allowable range and is not the coordinate on the dot spacer without performing the pressing detection process for each of the x and y coordinates. Output as coordinate data.

Further, in the coordinate detecting device according to the present invention, when the pressure is detected at a constant cycle and the pressure is detected twice in succession, a plurality of voltage values corresponding to the x and y coordinates are sampled after a predetermined time. , X and y coordinates are averaged to obtain the previous data by averaging the data, and the pressing detection is performed again in the next cycle. After the pressing detection, the x and y coordinates of the same pressing point are similarly sampled and averaged. The converted data is used as the current data, and it is determined whether the difference between the previous data and the current data is within the allowable fluctuation range. When the difference is within the allowable range, the average value of the previous data and the current data for each of the x and y coordinates is valid. Output as x, y coordinates.

[0016]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a coordinate detecting device according to the present invention, in which the same parts as those in FIG. 7 are designated by the same reference numerals. In the figure, a coordinate detecting device according to the present invention is a coordinate input unit in which two resistor sheets 1a and 1b are superposed on each other via a dot spacer 2 arranged on a boundary line of a key (switch) to be set. 3, an analog switch 4 for alternatingly selecting the analog information output from the coordinate input section 3, and a voltage source 5
Is connected to the coordinate input section 3 in an alternating manner, an A / D converter 7 for converting the alternatingly selected analog information into digital information, and the A / D converter 7. The main operation control device 8 that performs a certain process on the obtained series of information to obtain predetermined coordinate information has a basic configuration, and the main operation control device 8 uses the data collection circuit 9, the sequence control circuit 10, and the data processing. The configuration including the unit 11, the press detection circuit 12, and the I / O port 13 is basically the same as that of the conventional device.

The feature of the present invention resides in the specific configuration of the data collection circuit 9 in the main arithmetic and control unit 8. That is, the data collection circuit 9 includes an adder circuit 91 for adding N times of sampling data obtained from the A / D converter 7, an averaging circuit 92 for averaging the added sampling data, and the averaging circuit 92. X ₀ , y ₀ registers 93, 94 for storing sampling data, and x _PRE , y _PRE registers 9 for storing each data stored in these x ₀ , y ₀ registers 93, 94 as previous data.
5, 96, the contents stored in the x ₀ register 93 and the x _PRE register 95, and the y ₀ register 94 and the y _PRE register 96
The comparison / discrimination circuit 97 for comparing the respective stored contents of No. 1 and discriminating whether or not each data difference is within a predetermined allowable value, and the averaging circuit 98 for averaging the present data and the previous data. .. The control of the data acquisition circuit 9 is performed by the processor of the sequence control circuit 10.

Next, the procedure of the first embodiment of the coordinate detection processing executed by the processor of the sequence control circuit 10 will be described with reference to the flowchart of FIG. In the initial state, there is no input in the coordinate input section 3 composed of the resistor sheets 1a and 1b. In such a state, the processor controls the I / O port 13 to detect pressing of the analog switches 4 and 6. The mode is set (step S1). After that, the processor monitors the constant period T and determines whether or not it is the pressure detection timing of the constant time T (step S2).
The conversion start control is performed on the A / D converter 7 via the / O port 13 (step S3), and then the data acquisition circuit 9 and the pressure detection circuit 12 are controlled (step S).
4). As a result, the data collection circuit 9 absorbs the pressure data from the A / D converter 7 and sends it to the pressure detection circuit 12. Further, the pressure detection circuit 12 compares the pressure data with the pressure detection level, and determines whether or not the pressure has been applied (ON / OFF).
And the ON / OFF signal is sent to the sequence control circuit 10
To send to.

The processor uses the O from the press detection circuit 12.
The input state of the coordinate input section 3 is determined based on the N / OFF signal (step S5). If there is no pressing input (OFF), the sequence is returned to the initial state and the above sequence is repeated. If there is a press input (ON), the processor determines whether it is the first press input or the second press input (step S6), and if it is the first press input, manages the first press input. While returning to the initial sequence. If it is the second press input, the following series of data collection sequence is started as the first coordinate detection.

The processor first controls the I / O port 13 to set the analog switches 4 and 6 to the x-coordinate detection mode (step S7), then waits for the time td to elapse (step S8), and then A The A / D converter 7 and the data acquisition circuit 9 are controlled to perform A / D conversion N times (step S
9, S10). At this time, the data acquisition circuit 9 displays the A / D
The addition circuit 91 adds N times of sampling data obtained from the converter 7. The processor averages the added sampling data by the averaging circuit 92 and stores it in the x ₀ register 93 (step S11).

Next, the processor controls the I / O port 13 to set the analog switches 4 and 6 in the y-coordinate detection mode (step S12), and after waiting the elapse of time td (step S13), The A / D converter 7 and the data acquisition circuit 9 are controlled to perform A / D conversion N times (steps S14 and S15). At this time, the data collection circuit 9
The addition circuit 91 adds the N times of sampling data obtained from the / D converter 7. The processor averages the added sampling data in the averaging circuit 92 and stores it in the y ₀ register 94 (step S16).

Subsequently, the processor determines whether or not the above-mentioned data collection sequence is the first coordinate detection (step S17), and if it is the first coordinate detection, it controls the data collection circuit 9 and x _0. Register 93 and y ₀ register 9
The data stored in 4 is transferred to the x _PRE register 95 and the y _PRE register 96 as the previous data (step S18). After that, the processor waits for the second coordinate detection timing to arrive (step S19),
At the second coordinate detection timing, the coordinate data is sampled by returning to step S7 and repeating the above-described processing procedure, and each of the x and y coordinate data is the x ₀ register 93 as the second coordinate detection data. And the y ₀ register 94.

After storing the coordinate detection data for the second time, the processor shifts to a sequence other than the coordinate detection for the first time in the determination of step S17, and registers x ₀ and y _0.
The data stored in the register 94 is set as the current data, and x
₀ register 93, y ₀ register 94, x _PRE register 9
The data stored in the 5, y _PRE register 96 is transferred to the comparison / determination circuit 97 (step S20). In the comparison / discrimination circuit 97, the present data and the previous data of the x and y coordinates, that is, the x ₀ register 93 and the x _PRE register 9
5 and the contents of the y ₀ register 94 and the y _PRE register 96 are compared to determine whether the difference between the respective data is within a predetermined allowable value range, and the determination information is transferred to the sequence control circuit 10. ..

The processor determines whether or not the difference between the first and second data is within the allowable value range based on the discrimination information from the comparison / discrimination circuit 97 (step S21).
If either one of the x and y coordinates is out of the allowable range, the sequence is set to the initial state, and a series of data collection sequence is performed from step S1. On the other hand, if both x and y coordinates are within the allowable range, the processor determines that the data stored in each register is stable coordinate data corresponding to the pressing position, and the contents of each register described above are averaged. The transfer is controlled to 98, and the present data and the previous data are averaged (step S22). That is, the x ₀ register 93
And the contents of the x _PRE register 95 are averaged to generate valid x coordinate data, and the contents of the y ₀ register 94 and the y _PRE register 96 are averaged to generate valid y coordinate data.

The processor transfers the valid x-coordinate data and y-coordinate data to the data processing unit 11, processes the x- and y-coordinate data to send it to the desired resolution of the host device (not shown), and sends it. (Step S23), transmission control of x, y coordinate data is completed. As described above, the control of the series of data collection sequences is completed. The control of this series of data collection sequences is repeatedly executed in a predetermined cycle.

FIG. 3 is a flowchart showing a second embodiment of the coordinate detection sequence. The processing procedure in this embodiment is basically the same as that in the first embodiment, and only the processing after step S21 is different. That is, when it is determined in step S21 that both the x and y coordinates are within the allowable value range, the detected x and y coordinates are switched after averaging the current data and the previous data (step S22). It is determined whether or not it is within the area, in other words, whether or not the pressed position is on the dot spacer 2 (step S24).

When it is determined that the detected x and y coordinates are outside the area of the switch, the valid x coordinate data and y coordinate data obtained in step S22 are transferred to the data processing unit 11 and not shown. The x and y coordinate data is processed and transmitted in order to convert it into the desired resolution of the host device (step S).
23). If it is determined in step S21 that either one of the x and y coordinates is outside the allowable value range, or if the x and y coordinates detected in step S24 are within the switch area, This data is x _PRE , y
Discarded from the _PRE , x ₀ , and y ₀ registers (step S25).

Next, the processor releases the pressed (ON) state (O) so as not to detect the coordinates of the invalid area.
It is confirmed whether or not it has been FF) (step S26). If it is OFF, the process returns to step S1 to control a series of data collection sequences, while if it is not OFF, waits until it is OFF (step S
26), when it is turned off, as in the above, step S1
To a sequence of sequence control from.

FIG. 4 is an operation waveform diagram showing the correspondence between the actual analog voltage waveform and the x-coordinate detection timing in the first and second embodiments. Now in FIG. 4 (A),
At time t ₀ , the analog switches 4 and 6 are set to the press detection mode, and when the press is detected again after the elapse of the next cycle T time from the time t ₁ at which the press is detected (time t ₂ ), the analog switches 4 and 6 are detected. To the x-coordinate detection mode for a predetermined time td
After the lapse of time, the first sampling by A / D conversion is continuously performed at least twice at the timing of time t ₃ .
A series of sampling values (points represented by black circles in the figure) are averaged to obtain previous data, and sampling is performed by A / D conversion at least twice again at the timing of time t ₄ after the next cycle T time, A series of sampling values (points represented by black circles in the figure) are averaged to obtain the current data.

If the difference between the previous data and the present data is within the set value range W, it is determined that the contact state of the resistor sheets 1a and 1b is stable, and the coordinate data is sent as valid coordinate data. However, as shown in FIG. 4B, the coordinate detection sequence is not performed when the contact resistance of the resistor sheets 1a and 1b is not stable and the analog voltage waveform is unstable. In other words, reliable coordinate detection operation is possible. Further, as shown in FIG. 4C, the resistor sheet 1
a, because 1b contact is unstable, even if the previous data and the difference between the current data in the second sampling time t ₄ at first sampling time t ₃ has had exceeded the set value range W The previous data and the current data can be invalidated because they cause an erroneous input, and a reliable coordinate detection operation becomes possible.

FIG. 5 is a flow chart showing a third embodiment of the coordinate detection sequence. The processing procedure in this embodiment is basically the same as that in the first embodiment, and when the second coordinate detection timing comes after step S19, the resistor sheets 1a and 1b are pressed again. A process for detecting the state (steps S27 to S29) is newly added.

That is, the processor proceeds to step S19.
Waiting for the second coordinate detection timing at, when the second coordinate detection timing comes, the analog switches 4 and 6 are set to the pressure detection mode (step S27), and the arrival of the pressure detection timing for a certain time T is monitored ( Step S2
8). Then, when the press detection timing T arrives, it is judged by comparing the press data with the press detection level whether or not the press is made (ON / OFF) (step S2).
8) If it is ON, the process returns to step S7 to start the second coordinate detection, and if it is OFF, the detection sequence is returned to the initial state.

FIG. 6 is an operation waveform diagram showing the correspondence between the actual analog voltage waveform and the x-coordinate detection timing in the third embodiment. In FIG. 6 (A), when the pressing is detected again after the elapse of the next period T time from the time t ₁ when the pressing is detected (time t ₂ ), the analog switches 4 and 6 are set to the x-coordinate detection mode, and the predetermined time is set. After the lapse of time td, time t ₃
The first sampling is performed by A / D conversion at least twice continuously at the timing of. A series of sampling values (points represented by black circles in the figure) are averaged to obtain the previous data, and the pressing detection is performed again after the time of the next cycle T. And
After a lapse of a predetermined time td from the time when the pressing is detected (time t ₄ ),
At the timing of time t _5, the second sampling is again performed at least twice by the A / D conversion, and a series of sampling values (points represented by black circles in the figure) are averaged to obtain the current data.

If the difference between the previous data and the current data is within the set value range W, it is determined that the contact state of the resistor sheets 1a and 1b is stable, and the coordinate data is sent as valid coordinate data. However, as shown in FIG. 6B, the coordinate detection sequence is not performed when the contact resistance of the resistor sheets 1a and 1b is not stable and the analog voltage waveform is unstable. In other words, reliable coordinate detection operation is possible. Further, as shown in FIG. 6C, the resistor sheet 1
Because contact between a and 1b is unstable (chattering), 1
Even if sampling is performed at the _third sampling time t ₃ , it is detected as OFF by ON (press) detection after the time T of the next cycle, the second sampling is not performed, and an incorrect coordinate detection operation is not performed.

Further, from the timing of the subsequent time t ₂ , the difference between the previous data by the sampling at the time t ₃ after the elapse of the predetermined time td and the current data by the sampling at the second sampling time t ₅ is the resistance sheet. 1
If the set value range W is exceeded due to unstable contact between a and 1b, it will cause an erroneous input, so the previous data and the current data can be invalidated, and reliable coordinate detection operation is possible. Becomes

[0036]

As described above in detail, according to the present invention, when the pressure is detected at a constant cycle and the pressure is detected at least twice in succession, the voltage value corresponding to the x and y coordinates after a fixed time is reached. Sampled a plurality of times, and averaged each data sampled for each x, y coordinate to obtain the previous data, and similarly sampled and averaged the x, y coordinates of the same pressing point in the next cycle. Is used as the current data, and it is determined whether the difference between the previous data and the current data is within the allowable variation range. ，
By using the y coordinate, it is possible to eliminate the unstable analog voltage level at the pressed position due to the instability of the contact resistance between the upper and lower resistance sheets, so it is possible to always detect coordinate data accurately and stably. Become.

If the difference between the previous data and the current data of the x and y coordinates is not within the allowable range, or if the dot spacer is pressed even within the allowable range,
Discard the average value of the previous data and the current data for each of the x and y coordinates, until the current pressed state is once released,
The average value of the previous data and the current data is valid only when the difference between the previous data and the current data is within the allowable range and is not the coordinate on the dot spacer without performing the pressing detection process for each of the x and y coordinates. By outputting as coordinate data, it is possible to eliminate the unstable analog voltage level at the pressing position due to the instability of the contact resistance between the upper and lower resistance sheets, especially when pressing on the dot spacers, and the switch area boundary Since it is not necessary to detect coordinates, stable coordinate data can be output, and unnecessary processing time and power consumption can be saved.

Furthermore, when pressing is detected twice in succession, a plurality of voltage values corresponding to x and y coordinates are sampled after a fixed time, and each sampled data for each x and y coordinate is averaged to obtain the previous value. With the data, pressure detection is performed again in the next cycle, and after the pressure detection, x,
The y-coordinates are similarly sampled and averaged to be the current data, and it is determined whether the difference between the previous data and the current data is within the allowable fluctuation range. When the difference is within the allowable range, the x and y coordinates are calculated for the previous time. By outputting the average value of the data and the current data as valid x and y coordinates, it is possible to eliminate the inappropriate analog voltage level for the second time. -It is possible to always output appropriate coordinate data without being affected by chattering or the like due to instability of contact resistance between the lower resistance sheets.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a coordinate detecting device according to the present invention.

FIG. 2 is a flowchart showing a processing procedure of a first embodiment of coordinate detection.

FIG. 3 is a flowchart showing a processing procedure of a second embodiment of coordinate detection.

FIG. 4 is an operation waveform diagram showing a correspondence relationship between an actual analog voltage waveform and an x coordinate detection timing in the first and second embodiments.

FIG. 5 is a flowchart showing a processing procedure of a third embodiment of coordinate detection.

FIG. 6 is an operation waveform diagram showing a correspondence relationship between an actual analog voltage waveform and an x coordinate detection timing in the third embodiment.

FIG. 7 is a block diagram showing a conventional example of a coordinate detection device.

FIG. 8 is an explanatory diagram of the operation at the time of normal coordinate detection, (A)
FIG. 4B is a sectional structural view of the resistor sheet in a pressed state, and FIG.

FIG. 9 is an explanatory diagram of an operation at the time of detecting unstable coordinates,
(A) is a sectional structural view of the resistor sheet in a pressed state, (B)
Is a timing waveform diagram.

FIG. 10 is a plan view showing a contact area in an unstable state.

[Explanation of symbols]

1a, 1b Resistor sheet 2 Dot spacer 3 Coordinate input unit 4,6 Analog switch 8 Main arithmetic control device 9 Data acquisition circuit 10 Sequence control circuit 11 Data processing unit 12 Press detection circuit

Claims (3)

[Claims] 1. A coordinate input means for outputting voltage values respectively corresponding to x and y coordinates of a pressed point on a resistor sheet, and a voltage value corresponding to x and y coordinates of said coordinate input means, alternately. Switching means for outputting the pressing state of the coordinate input means, a pressing detection means for detecting the pressing state of the coordinate input means at a constant cycle, and a voltage value corresponding to the x and y coordinates after the pressing detection means detects pressing continuously at least twice. Storage means for storing the respective sampled data as previous data, and control means for setting the data obtained by sampling the voltage values corresponding to the x and y coordinates of substantially the same pressing point after the constant cycle after the detection of the previous data as the present data. A comparison unit that generates a comparison output when the difference between the previous data and the current data is within an allowable range, and the previous data is generated only when the comparison output occurs. A coordinate detection device characterized by outputting the average value of the current data and the current data as valid coordinate data. 2. The resistor sheet has a configuration in which dot spacers are arranged at the boundaries of the switch regions, and comprises a determining means for determining whether or not the coordinates input by the coordinate input means are coordinates on the dot spacers. The average value of the previous data and the current data is output as valid coordinate data only when the comparison output is generated and the coordinate is not on the dot spacer by the determination means. Item 1. The coordinate detection device according to item 1. 3. The pressing detection means detects the pressing state of the coordinate input means again after a fixed period after the detection of the previous data, and the control means has substantially the same after detecting the pressing again by the pressing detection means. 2. The coordinate detecting device according to claim 1, wherein data obtained by sampling voltage values corresponding to x and y coordinates of the pressed point is set as current data.