JP2000284899A - Touch panel multi-point operation correction device - Google Patents

Abstract

(57) [Summary] [Problem] To provide a touch panel multi-point operation correction device that, when multi-point operation is performed, uses an original operation point or a point as close as possible to the original operation point as a coordinate value. . SOLUTION: A retroreflector on an operation surface is optically scanned by rotation of a scan mirror at two points of a first and a second channel on a display screen portion, and light reflected by the retroreflector is received to perform an operation. In a touch panel in which coordinates are detected by the touch panel MPU based on a light scanning detection angle from the start to the operation unit, the touch panel MPU includes:
A detection counter for measuring a plurality of detection points for each channel, and a detection count register for counting optical scanning detection data for each of the plurality of detection points, wherein the optical scanning detection data for each of the plurality of detection points of the detection count register Is multiplied by the count value of the detection counter to calculate an average value, and the coordinates are calculated based on the average value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to optical scanning of a retroreflector with light output from a light emitting section by rotation of a scan mirror, and the light reflected by the retroreflector is reflected again by the scan mirror. The present invention relates to a multi-point operation correction device for an optical scanning touch panel that receives light at a light receiving unit and detects coordinates of an operation pressing position on an operation surface.

[0002]

2. Description of the Related Art Generally, an optical scanning type touch panel is shown in FIG.
As shown in the figure, a rectangular substrate 1 formed by forming an optical filter on the lower surface of a protective glass on a rectangular display screen portion 38
Channel 0 with channel 0 on both sides of one side
An optical scanning unit 11a of (CH1) and an optical scanning unit 11b of CH2 are arranged, and an elongated frame is formed on three sides of the upper surface of the substrate 10 excluding the mounting side of the optical scanning units 11a and 11b. A retroreflector 13 is attached to the inner surface of the frame 12. The retroreflector 13 is formed in a tape shape, for example, and is adhered to the inner surface of the frame 12.

The optical scanning unit 11a (and the optical scanning unit 11b) is, as shown in FIG.
The fixing portion (not shown) is fixed to the substrate 10, and the unit main body 14 is mounted on the fixing portion and is attached so that the angle can be adjusted. A light emitting element (for example, a laser diode) 16 such as a semiconductor laser device and a light receiving element 17 are housed in the unit main body 14, and an upper surface thereof is provided.
Laser light 18 as scanning light output from light emitting element 16
A refracting prism 19 for refracting light (hereinafter simply referred to as light 18), a prism 21 having a half mirror 20 for transmitting the refracted light 18, and a scan mirror 22 are provided. , And rotatably provided by a pulse motor 23.

The light 18 output from the light emitting element 16 is
Is refracted by the refraction prism 19, passes through the half mirror 20 and the prism 21, is reflected by the scan mirror 22, and irradiates the retroreflector 13. In this retroreflector 13,
The reflected light is reflected by the scan mirror 22 on the substantially same optical path as the incident light, is reflected and refracted by the half mirror 20 of the prism 21, and is received by the light receiving element 17. The light 18 is scanned by the angle θ (for example, about 90 °) by the rotation of the scan mirror 22 by the pulse motor 23. If there is an object (for example, a finger or a pen) 24 in this optical scanning range, the light 18 is blocked by the object 24, and the angle θ of the object 24 is detected based on the received light energy of the light receiving element 17. You.

In FIG. 10A, when scanning is performed by the scan mirrors 22a and 22b of CH1 and CH2, respectively,
0 (b), the scan mirrors 22a, 22b
Of the position P on the coordinate plane designated by the object 24 by measuring the time measurement values corresponding to the angles θ1 and θ2 to the object 24 during the effective period (for example, about 90 °) of the object P. x, y) are determined by the principle of triangulation. That is, the maximum measurement number in the period of the angle k = π / T per unit measurement time is obtained by the angle θn = k × time measurement value of the object 24. Assuming that the length from the optical scanning unit 11a of CH1 to the optical scanning unit 11b of CH2 on the coordinate plane is L, the position P (x, y) of the object 24 on the coordinate plane is: x = y · tan θ1. (1) y = L ・ tan θ2 / (tan θ1 + tan θ2) (2) Since the following relationship is established, x and y are obtained based on the equations (1) and (2).

[0006]

However, in the above-described method, as shown in FIG. 11 (a), when the operation is performed at two points T1 and T2, the point P is detected as imaginary coordinates. There is a problem that it leads to malfunction. this is,
When the touch panel portion is large and the operation buttons are displayed in a large size, the image is operated with the whole hand rather than operated with one finger, and a plurality of fingers touch the touch panel. .

A more specific description will be given with reference to FIGS. In (b), scan mirror 2 of CH1
Assuming that 2a scans in the direction of the arrow, the reflected light from the retroreflector 13 is blocked at the positions T2 and T1, and the angles θ12 and θ11 corresponding to the time measurement values are obtained.
Is measured. If the scan mirror 22b of CH2 scans in the direction of the arrow, the retroreflector 13
Is reflected at the positions T1 and T2, and the angles θ21 and θ22 corresponding to the time measurement values are measured.

Originally, the coordinates (x1, y1) of T1 are: x1 = y1 · tan θ11 y1 = L · tanθ21 / (tanθ11 + tanθ2)
1) and the coordinates (x2, y2) of T2 are: x2 = y1 · tan θ12 y2 = L · tan θ22 / (tan θ12 + tan θ2)
2) where xa = y1 · tan θ12 ya = L · tan θ21 / (tan θ12 + tan θ2) as fictitious coordinates P (xa, ya)
There is a problem that 1) is measured.

There is a method of prohibiting the operation as a touch panel when two or more points are pressed in such a manner. However, there is a problem that it is inconvenient as a product that is forcibly pressed or the like.

The present invention provides a touch panel multi-point operation correcting apparatus which adopts, as a coordinate value, an original operation point or a point as close as possible to the original operation point when such a multi-point operation is performed. The purpose is to do so.

[0011]

According to the present invention, a retroreflector on an operation surface is optically scanned by rotation of two scan mirrors of first and second channels on a display screen, and the retroreflector is provided. Receives the light reflected by the touch panel, and based on the optical scanning detection angle from the start of operation to the operation unit, the touch panel MPU
The touch panel MPU includes a detection counter that measures a plurality of detection points for each of the channels, and a detection count register that counts optical scanning detection data for each of the plurality of detection points. The average value is calculated by dividing the value obtained by adding the optical scanning detection data for each of the plurality of detection points of the detection count register by the count value of the detection counter, and calculating the coordinates based on the average value. This is a multi-point operation correction device for a touch panel.

When the display screen is operated at multiple points, measured values are read from a plurality of detection count registers of the work RAMM built in or externally attached to the touch panel MPU. All of these multiple measurement values are stored in the touch panel MPU.
And an average value is calculated as an output detection value by dividing by the count number detected by the detection number counter. These are similarly calculated for the first and second channels. Based on these average signals, the touch panel MPU
The scanning angles θ1 and θ2 of the object at H1 and CH2 are obtained, and the coordinates of the position on the coordinate plane designated by the object are obtained from the obtained angles θ1 and θ2 by the principle of triangulation.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a touch panel multipoint operation correcting apparatus according to the present invention will be described below. As shown in FIG. 1, the multi-point operation correcting device for a touch panel according to the present invention includes an optical scanning unit 11a for the first channel (CH1).
And an optical scanning unit 11b for the second channel (CH2). The optical scanning units 11a and 11b are:
The touch panel MPU 70 is connected to a work RAM 40a for CH1,
The display device 72 is connected to the work RAM 40b for H2.

The optical scanning unit 11 for CH1 and CH2
Since a and 11b have the same configuration, only the optical scanning unit 11a of CH1 will be described in detail. Light emitting element 1
6a is coupled to the light emitting driver 50a. Scan mirror 22a is coupled to pulse motor 23a.

The light-receiving element 17a has a current / voltage conversion circuit 5 for converting a current corresponding to the received light energy into a voltage.
2a, A / D (analog / digital) conversion circuit 53a
And the primary reflected light separation circuit 54a are sequentially coupled.
The next reflected light separation circuit 54a is provided with the A / D conversion circuit 53a.
The signal corresponding to the primary reflected light (maximum received light energy) of the scan mirror 22a is separated from the output signals of the above, and an optical scanning start pulse is output. Reference numeral 55 denotes a measuring oscillator that outputs a measuring clock.
A counter 56 together with the primary reflected light separation circuit 54a
a. This counter 56a counts one of the light scanning start pulses obtained by the primary reflected light separation circuit 54a.
The measuring clock of the measuring oscillator 55 in the cycle is counted.

The touch panel MPU (microprocessor unit) 70 includes a ROM (read only memory), a RAM (random access memory), a counter, and a register.
The scanning angle θ1 of the object 24 is calculated based on the object detection signal of the count value signal of the measurement counter 56a. The touch panel MPU 70 calculates an average value when a multipoint operation is detected.
The work RAM 40a, which is unique to the present invention and includes a detection count register 42a, is built in or externally provided. The above configuration is the same for CH2.

(1) The operation of detecting a normal coordinate position by operating the display screen 38 by one point will be described. in this case,
Since this is the same as FIGS. 11A and 11B, description will be made based on this figure. (A) Scan mirror 2 using pulse motor 23a of CH1
By rotating 2a, the retroreflector 13 is optically scanned with light 18 output from the light emitting element 16a. The light 18 reflected by the retroreflector 13 is scanned by the scan mirror 22a.
Is received by the light receiving element 17a. The effect of (a) is the same for CH2.

(B) The current corresponding to the received light energy of the light receiving element 17a is converted into a voltage by a current / voltage conversion circuit 52a, converted into a digital signal by an A / D conversion circuit 53a, and converted into a primary reflected light separation circuit 54a. , And an optical scanning start pulse corresponding to the primary reflected light of the scan mirror 22a is output from the primary reflected light separation circuit 54a. The measuring clock in one cycle of the optical scanning start pulse is a counter 5
6a, the count value signal is output from the touch panel MPU 70
Output to

(C) The touch panel MPU 70 calculates the scanning angle θ1 of the object 24 based on the object detection signal of the count signal of the counter 56a in the optical scanning unit 11a. The operations (b) and (c) operate similarly in CH2, and the touch panel MPU 70
Is calculated. And touch panel MP
U70 calculates the coordinates (x, y) of the position P on the coordinate plane designated by the object 24 by performing an arithmetic operation by applying the obtained angles θ1 and θ2 to the equation shown in FIG. Is output to the display device 72.

(2) The operation of detecting the coordinate position when the display screen 38 is operated at multiple points will be described. As shown in FIG. 11B, the touch panel MPU 70 detects the target value signal of the count value signal of the counter 56a in CH1 as shown in FIG.
Assuming that two or more points are detected, as shown in FIG. 2, the measured values are read from the plurality of detection count registers 42a of the work RAM 40a built in or external to the touch panel MPU 70, respectively. All of the plurality of measurement values are added by the touch panel MPU 70, and the sum is divided by the count number detected by the detection number counter 40a to calculate an average value as an output detection value. Similarly, an average value is calculated as an output detection value for CH2. As described above, the touch panel MPU 70 calculates the scanning angles θ1 and θ2 of the object 24 in CH1 and CH2 based on these average signals, and calculates the obtained angles θ1 and θ2 in FIG.
, The coordinates (x, y) of the position P on the coordinate plane designated by the object 24 are obtained, and the corresponding signal is output to the display device 72.

In the embodiment shown in FIG. 2, the count number detected by the detection number counter 40a in CH1 is:
The count number detected by the detection number counter 40b in CH2 usually coincides with the count number. If they do not match, the touch panel MPU 70 determines that the signal is an abnormal signal,
Perform error processing and do not calculate coordinates.

In the embodiment shown in FIG. 2, the count number detected by the detection number counter 40a in CH1 is:
When the count number detected by the detection number counter 40b in CH2 is plural, the output detection value (average value) -detection count register 1 ≦ constant value Output detection value (average value) −detection count register 2 ≦ constant Value…… Output detection value (average value) −Detection count register n ≦ Confirmed by the touch panel MPU 70 whether or not all of the constant values are satisfied.
70 performs a coordinate calculation process.

In the embodiment shown in FIG. 2, the count number detected by the detection number counter 40a in CH1 is:
When there are a plurality of count numbers detected by the detection number counter 40b in CH2, for example, FIG.
As shown in (a), when two points T1 and T2 are detected, these imaginary coordinate points P also appear. Therefore, the touch panel MPU 70 calculates the coordinates of the combination based on these pieces of angle information, and further obtains the average coordinate point A1. Except for the coordinate data of the imaginary coordinate point P which is the farthest from the average coordinate point A1 when viewed from the x-axis, as shown in FIG. 3B, the average value A0 is again calculated by the remaining coordinate data of T1 and T2. Then, the coordinates of the re-average value A0 are determined as final coordinate values.

In FIG. 4A, to obtain the scan angles θ1 and θ2 of the object 24 at CH1 and CH2, as indicated by the dotted arrows, CH1 turns clockwise in the figure, and CH2 turns clockwise in the figure. , Each scan mirror 22a,
22b is the reverse rotation direction. However, as shown in FIG. 4B, the count number detected by the detection number counter 40a in CH1 and the detection number counter 40b in CH2
In the case where the count number detected in step 2 is 2, in CH1, θ12 of T2 is first and θ11 of T1 is
, And in CH2, conversely, θ21 of T1 comes first,
Θ22 of T2 comes later. Therefore, a fictitious coordinate point is generated. Therefore, if both scan mirrors 22a and 22b of CH1 and CH2 have the same rotation direction as the counterclockwise direction in the drawing, both of CH1 and CH2 detect T2 first. However, in CH2, θ22 ′ and θ21 ′ are detected. Therefore, the touch panel MPU 70
Θ22 ′, θ2 obtained by the CH2 scan mirror 22b
By calculating and outputting θ22 ′ = 90 ° −θ22 θ21 ′ = 90 ° −θ21 based on 1 ′, T2 is always detected first in both CH1 and CH2, and imaginary coordinates are erroneously calculated. Never. Note that in FIG. 4B, both may be clockwise in the figure. In this case, T1 is always detected first.

As described above, in order to obtain θ1 and θ2, the respective scan mirrors 22a and 22b are set in reverse rotation directions. However, if multiple operations are performed, imaginary coordinate points are generated. Therefore, as shown in FIG. 5, in the case where CH1 and CH2 are in the reverse rotation direction, one CH1 is calculated from the first detected angle, and the CH2 is calculated from the last detected angle. This eliminates the possibility of erroneously detecting coordinates that have not been operated.

As described above, when a plurality of points are detected, for example, as shown in FIG. 6, when two points T1 and T2 are detected, these imaginary coordinate points P also appear. Therefore,
The touch panel MPU 70 calculates the coordinates of the combination using these pieces of angle information, and calculates T1-P, P-T2,
Lines a, b, and c connecting T2-T1 are set, and the parallelism with the line L connecting the scan mirrors 22a-22b is calculated.
If it is determined that the line c is the line with the highest parallelism, it is selected, and the midpoint A of the line c is obtained as the detection coordinates.

When a plurality of points are detected, for example,
As shown in FIG. 3A, when two points T1 and T2 are detected, these imaginary coordinate points P also appear. Therefore, as shown in FIG. 7, the touch panel MPU 70 calculates coordinates of a combination of three points based on the angle information, calculates a circle M passing through the three points T1, T2, and P, and calculates the center point of the circle M. Let O be the detected coordinates. As a result, the detected coordinates are set to the points T1, T
2 can be approached.

In the above embodiment, the problem when a plurality of points are detected, that is, the case of a key operated by one-point operation has been described. The present invention is not limited to this, and a key operated by one-point operation and a key operated by multiple-point operation may be distinguished to have a plurality of operations per key. On the touch panel, basically, only the operation of touching, releasing, and moving the operation unit on the screen can be performed, but with the mouse operation, operations such as right button, left button, and double click can be performed. Therefore, as described above, a key operated by one-point operation and a key operated by multiple-point operation are distinguished from each other, and a plurality of operations are performed per key. , The function can be easily extended such as corresponding to a right button operation.

[0029]

According to the first aspect of the present invention, the touch panel MPU has a detection counter for measuring a plurality of detection points for each channel and a detection count register for counting optical scanning detection data for each of the plurality of detection points. Therefore, even if two or more points are pressed, the operation as a touch panel is not prohibited, and therefore, it is inconvenient as a product to be mistaken for a failure or forcibly pressed. Can be eliminated.

According to the second aspect of the present invention, the touch panel MPU calculates the average value by dividing the value obtained by adding the optical scanning detection data for each of the plurality of detection points of the detection count register by the count value of the detection counter. Since the function is provided, the original operation point or a point as close as possible to the original operation point can be adopted as the coordinate value.

According to the third aspect of the present invention, the touch panel MPU calculates the average value by dividing the value obtained by adding the optical scanning detection data for each of the plurality of detection points of the detection count register by the count value of the detection counter. With the function of
When the difference between this average value and each optical scanning detection data for each of the plurality of detection points is within a certain range, coordinate calculation is performed by the average value, and when the difference is outside the certain range, no coordinate calculation is performed. Because the function is provided, the count number in CH1 and the count number in CH2 usually match, but if they do not match, the touch panel MPU
Can be determined to be an abnormal signal, and error processing can be performed to prevent coordinate calculation.

According to the fourth aspect of the present invention, the touch panel MPU determines whether or not the count values of the respective detection counters of the first and second channels are different from each other. Since the touch panel MPU is provided with a function of not performing coordinate calculation as an abnormal signal when different, abnormal data is excluded, and the touch panel MPU can perform the coordinate calculation processing only when all are satisfied.

According to the fifth aspect of the present invention, the touch panel MPU performs a coordinate calculation of a plurality of combinations based on the detected angle information, obtains an average coordinate point thereof, and obtains a coordinate farthest from the average coordinate point. Excluding the data, the average value is obtained again from the remaining coordinate data, and the function of setting the coordinates of the reaverage value as the final coordinate value is provided, so the coordinates of the imaginary coordinate point farthest from the average value coordinate point The average value is obtained again from the remaining coordinate data excluding the data, and the coordinates of the reaverage value closer to the original coordinates can be determined as the final coordinate value.

According to the sixth aspect of the present invention, the first and the second
Each of the scan mirrors of the channels is configured to rotate in the same direction to perform optical scanning, and the touch panel MPU selects the first or last detected angle information of both of the channels, and selects one of the two. Since a function of performing coordinate calculation based on the detected angle information in the channel and the angle information obtained by subtracting the detected angle information from the all-light scanning angle in the other channel is provided,
Regardless of H1 or CH2, one of the angle information is always detected first, and the imaginary coordinates are not erroneously calculated.

According to the seventh aspect of the present invention, the first and the second are provided.
The respective scan mirrors of the channels are configured to rotate in opposite directions to perform optical scanning, and the touch panel M
The PU has a function of selecting the first detected angle information in one channel, selecting the last detected angle information in the other channel, and performing a coordinate calculation based on these angle information. Therefore, it is possible to prevent erroneous detection of coordinates that are not originally operated.

According to the eighth aspect of the present invention, the first and the second.
The respective scan mirrors of the channels are configured to rotate in opposite directions to perform optical scanning, and the touch panel M
The PU calculates a combination of coordinates based on angle information of a plurality of operation points, sets lines connecting the coordinate points, and sets a parallelism between these lines and a line connecting the scan mirrors of the first and second channels. And the function of selecting the line having the highest parallelism among them, finding the midpoint of this line and using it as the detection coordinates is provided, so that it is the most parallel to the line connecting the scan mirrors of the first and second channels. By selecting a line with a high degree and determining the midpoint of this line as the detected coordinates, it is possible to prevent erroneous detection of coordinates that are not originally operated.

According to the ninth aspect of the present invention, the first and the second
The respective scan mirrors of the channels are configured to rotate in opposite directions to perform optical scanning, and the touch panel M
The PU performs a coordinate calculation of a combination of three points based on angle information of the operated two points and an imaginary coordinate point based on the two points, calculates a circle passing through the three points, and determines a center point of the circle as a detection coordinate. With this function, the detected coordinates can be made closer to the original operation point.

According to the tenth aspect of the present invention, a key operated by one-point operation and a key operated by multiple-point operation are distinguished from each other, and a plurality of operations are performed per key. With the two-finger operation described above, it is possible to easily extend functions such as corresponding to a right button operation similar to a mouse operation.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a touch panel multipoint operation correction device according to the present invention.

FIG. 2 is an explanatory diagram of a first embodiment of the present invention.

FIGS. 3A and 3B are explanatory diagrams of a second embodiment of the present invention.

FIGS. 4A and 4B are explanatory diagrams of a third embodiment of the present invention.

FIG. 5 is an explanatory diagram of a fourth embodiment of the present invention.

FIG. 6 is an explanatory diagram of a fifth embodiment of the present invention.

FIG. 7 is an explanatory diagram of a sixth embodiment of the present invention.

FIG. 8 is a plan view of a general optical scanning type touch panel.

FIG. 9 is a front view of a general optical scanning unit.

FIGS. 10A and 10B are explanatory diagrams showing the principle of triangulation for coordinate detection.

FIGS. 11A and 11B are explanatory diagrams in which imaginary coordinates are generated by coordinate detection when a multipoint operation is performed.

[Explanation of symbols]

Reference numeral 10: protection plate, 11a: first channel optical scanning unit, 11b: second channel optical scanning unit, 12:
Frame, 13: retroreflector, 14: unit body,
16 light emitting element, 17 light receiving element, 18 light, 19 refraction prism, 20 half mirror, 21 prism, 2
2a, 22b: scan mirror, 23a, 23b: pulse motor, 24: target object, 25: unit support plate, 38
... Display screen part, 40a, 40b ... Work RAM, 41
a, 41b: detection number counter, 42a, 42b: detection count register, 50a, 50b: light emission driver, 5
2a, 52b ... current / voltage conversion circuits, 53a, 53b ...
A / D conversion circuit, 54a, 54b: primary reflected light separation circuit, 55: measurement oscillator, 56a, 56b: counter,
70: Touch panel MPU, 72: Display device.

Claims (10)

[Claims] 1. A retroreflector on an operation surface is optically scanned by rotating scan mirrors at two points of a first and a second channel on a display screen, and light reflected by the retroreflector is received. In a touch panel in which coordinates are detected by a touch panel MPU based on a light scanning detection angle from the start of operation to an operation unit, the touch panel MPU
Comprises a detection counter for measuring a plurality of detection points for each channel, and a detection count register for counting optical scanning detection data for each of the plurality of detection points. Correction device. 2. The touch panel MPU has a function of calculating an average value by dividing a value obtained by adding optical scanning detection data for each of a plurality of detection points of a detection count register by a count value of a detection counter. 2. The multipoint operation correction device for a touch panel according to claim 1, wherein coordinates are calculated based on values. 3. The touch panel MPU has a function of calculating an average value by dividing a value obtained by adding optical scanning detection data for each of a plurality of detection points of a detection count register by a count value of a detection counter. A function for calculating coordinates by the average value when the difference between the average value and each optical scanning detection data for each of the plurality of detection points is within a certain range, and not calculating the coordinates when the difference is outside the certain range; The multipoint operation correction device for a touch panel according to claim 1, further comprising: 4. The touch panel MPU determines whether or not the count values of the respective detection counters of the first and second channels are different. When the determined numbers are the same, the coordinates are calculated. 4. The multipoint operation correcting device for a touch panel according to claim 2, further comprising a function of not performing coordinate calculation. 5. The touch panel MPU calculates a plurality of combinations of coordinates based on the detected angle information, finds an average coordinate point of the coordinates, and removes the coordinate data that is the most distant from the average coordinate point. The multi-point operation correction device for a touch panel according to claim 1, further comprising a function of calculating an average value again by using the coordinate value of the average value as a final coordinate value. 6. The scanning mirrors of the first and second channels are both configured to rotate in the same direction to perform optical scanning, and the touch panel MPU detects both of the channels first or last. Select the angle information,
A function for performing coordinate calculation based on angle information detected in one of the channels and angle information obtained by subtracting the detected angle information from the all-light scanning angle in the other channel. 2. The multipoint operation correction device for a touch panel according to claim 1. 7. The scanning mirrors of the first and second channels are configured to rotate in opposite directions to perform optical scanning, and the touch panel MPU uses one channel to display angle information detected first. 2. The multi-point touch panel according to claim 1, further comprising a function of selecting the last detected angle information on the other channel and performing coordinate calculation based on the selected angle information. Operation correction device. 8. The scanning mirror of each of the first and second channels is configured to rotate in opposite directions to perform optical scanning, and the touch panel MPU performs coordinate calculation of a combination based on angle information of a plurality of operation points. Set the lines connecting the coordinate points, calculate the parallelism between these lines and the lines connecting the scan mirrors of the first and second channels, and select the line with the highest parallelism among them. 2. The multipoint operation correction device for a touch panel according to claim 1, further comprising a function of determining a midpoint of the line and using the calculated coordinates as detection coordinates. 9. The scanning mirrors of the first and second channels are configured to rotate in opposite directions to perform optical scanning, respectively, and the touch panel MPU includes two operated points and imaginary coordinates based on these two points. 2. A function for calculating coordinates of a combination of three points based on angle information with respect to a point, calculating a circle passing through the three points, and using a center point of the circle as detection coordinates. The touch panel multi-point operation correcting device as described in the above. 10. The touch panel according to claim 1, wherein a key operated by one-point operation and a key operated by multiple-point operation are separately provided to have a plurality of operations per key. Multi-point operation correction device.