TW201435680A - Coordinate input device, coordinate input method, and storage medium - Google Patents

Abstract

A coordinate input device comprises: four pressure sensors that are disposed in predetermined positions of a panel an output ratio acquisition means that sums up output values obtained by the four pressure sensors, with respect to the respective pressure sensors, finds the ratios of the output values of the pressure sensors to the summed output values, and acquires the found ratios of the output values as individual output ratios of the respective pressure sensors and a pressing position determination means that, using the individual output ratios of the respective pressure sensors obtained by the output ratio acquisition means and a previously acquired coordinate correction amount, determines a pressing position on the panel.

Description

Coordinate input device, coordinate input method, and memory medium

One aspect of the disclosure relates to a coordinate input device, a coordinate input method, and a memory medium.

Conventionally, as a method of detecting a contact position or a pressed position of a finger of a touch panel (hereinafter referred to as a "panel" as needed) for a display unit such as a smart phone or a tablet terminal or an input/output display, it is known. A method using electromagnetic induction or parallel light shielding, a method using rigid body mechanics, or the like. As a method using rigid body mechanics, a method is known which has a sensor for detecting a component applied to a panel on a member of a support panel, and compares an output value detected by each sensor The area where the finger touches the panel is determined (for example, see Patent Document 1).

<Previous Technical Literature>

<Patent Literature>

Patent Document 1: (Japanese) JP-A-61-292732

However, the method described in the above Patent Document 1 has the advantage that the sensing method has a simple structure and does not depend on the panel characteristics, and on the other hand, since it utilizes only the force component of the force detected by the sensor. The pressing position is determined, so that there is a problem that the pressing position on the panel cannot be accurately detected.

The present invention has been made in view of the above problems, and an object thereof is to accurately determine a pressing position on a panel.

According to one aspect of the present disclosure, there is provided a coordinate input device having: four pressure sensors disposed at predetermined positions of the panel; and an output ratio acquisition unit paired by the four pressure sensors The obtained output values are totaled, and the ratio of the output value of the pressure sensor with respect to the total output value is obtained for each of the pressure sensors, and the ratio of the obtained output values is used as each of the pressures. Obtaining an individual output ratio of the sensor; and a pressing position determining unit that determines the individual output ratio of each of the pressure sensors obtained by the output ratio obtaining unit and the coordinate correction amount obtained in advance The pressing position of the panel.

According to one aspect of the present disclosure, the pressing position on the panel can be accurately determined.

10‧‧‧Coordinate input device

20‧‧‧Sensor Department

21‧‧‧Shell Department

22‧‧‧ panel

23‧‧‧ strain gauge

30‧‧‧PC

31‧‧‧ Input unit

32‧‧‧Output unit

33‧‧‧ memory unit

34‧‧‧Output ratio acquisition unit

35‧‧‧ Pressure acquisition unit

36‧‧‧Vertical horizontal direction pressure acquisition unit

37‧‧‧Displacement acquisition unit

38‧‧‧ coordinate correction acquisition unit

39‧‧‧Press position determination unit

40‧‧‧Control unit

41‧‧‧ Input device

42‧‧‧output device

43‧‧‧ drive

44‧‧‧Auxiliary memory device

45‧‧‧ memory device

46‧‧‧CPU

47‧‧‧Network connection device

48‧‧‧Memory Media

Fig. 1A is a plan view showing an example of a schematic configuration of a coordinate input device of the present embodiment.

Fig. 1B is a side view showing an example of a schematic configuration of the coordinate input device of the embodiment.

Fig. 2 is a view showing an example of a functional configuration of a PC of the present embodiment.

Fig. 3 is a view showing an example of a hardware configuration of the PC of the present embodiment.

Fig. 4A is a diagram for explaining the sensor calibration corresponding to the variable.

Fig. 4B is a diagram for explaining the sensor correction corresponding to the variable.

Fig. 4C is a diagram for explaining the sensor correction corresponding to the variable.

Fig. 5 is a flowchart showing the flow of the coordinate correction amount acquisition processing of the present embodiment.

Fig. 6 is a view for explaining an example of the idea of the displacement amount obtaining formula of the present embodiment.

Fig. 7 is a flowchart showing the flow of the pressing position determination processing of the present embodiment.

Hereinafter, embodiments of the present invention will be described in detail.

<Overview of coordinate input device>

1A and 1B are views showing an example of a schematic configuration of the coordinate input device of the present embodiment. As shown in FIG. 1A, the coordinate input device 10 has a sensor unit 20 and a PC (Personal Computer) 30.

The sensor portion 20 has a casing portion 21, a panel 22, and a strain gauge 23 as a pressure sensor.

The strain gauge 23 is placed at a predetermined position of the casing portion 21 (four corners in the example of Fig. 1A). Further, as shown in FIG. 1B, the casing portion 21 is provided with the panel 22 on the strain gauge 23.

The panel 22 is composed of, for example, a tantalum material, an aluminum plate, a metal composite plate, or the like. The panel 22 and the strain gauge 23 are connected by, for example, point contact. It should be noted that the panel 22 may include, for example, a panel, a sheet, or the like for detecting the position of the pressure or the position at which the pressure load is generated, and may be, for example, a touch panel or the like as a display unit.

The strain gauge 23 is composed of, for example, a load element and has strain gauges 23-1 to 23-4. The strain gauges 23-1 to 23-4 are provided on the casing portion 21 so as to support the predetermined position of the panel 22 (four corners in the example of Fig. 1A). It should be noted that the strain gauge 23 can also incorporate an amplifier.

The sensor unit 20 converts the values obtained by the strain gauges 23-1 to 23-4 into digital values by means of a built-in AD converter, and transmits the converted digital value to the PC 30 via, for example, a USB cable.

In addition, the size, shape, and the like of the casing portion 21, the panel 22, the strain gauge 23, and the like in the sensor portion shown in FIGS. 1A and 1B are not limited thereto. For example, the panel 22 may be configured. A shape such as a circle other than a rectangle.

The PC 30 determines the position of the contact or pressing panel 22 by the digit value acquired from the sensor unit 20, and detects information processing of the user's motion or the like performed by the sensor unit 20 based on the determined position. Device.

It should be noted that the PC 30 may be a PD (Portable Device), a PDA (Personal Data Assistant), a mobile phone, a game machine, or the like, or may be a junction integrated with the sensor unit 20. Structure.

<PC30: Functional Configuration Example>

Next, the functional configuration of the PC 30 included in the coordinate input device 10 will be described. Fig. 2 is a view showing an example of a functional configuration of a PC of the present embodiment.

As shown in FIG. 2, the coordinate input device 10 includes an input unit 31, an output unit 32, a memory unit 33, an output ratio acquisition unit 34, each side pressure acquisition unit 35, a vertical horizontal direction pressure acquisition unit 36, and a displacement amount acquisition unit 37. The coordinate correction amount acquisition unit 38, the depression position determination unit 39, and the control unit 40.

Here, the coordinate input device 10 in the present embodiment roughly performs two processes of pre-processing and pressing position determination processing. In the pre-processing, a coordinate correction amount (for example, a scale having a reference point and a resolution of the correction target region) for setting a coordinate of the correction target region (for example, on the panel 22) on the rectangle is obtained in advance. Two strain gauges 23 among the four strain gauges 23-1 to 23-4 are respectively formed as four sides of the end portion.

This coordinate correction amount is obtained, for example, by the output ratio acquisition unit 34, the respective side pressure acquisition units 35, the vertical horizontal direction pressure acquisition unit 36, the displacement amount acquisition unit 37, and the coordinate correction amount acquisition unit 38.

Further, in the pressing position determination processing, the pressing position is determined based on the coordinate correction amount acquired in the previous processing and the value obtained by the strain gauges 23-1 to 23-4 when the user presses the panel 22.

The pressed position is determined by the output ratio acquisition unit 34, the respective side pressure acquisition units 35, the vertical horizontal direction pressure acquisition unit 36, the displacement amount acquisition unit 37, and the depression position determination unit 39.

Hereinafter, the details will be described. The input unit 31 has, for example, a keyboard or a pointing device such as a mouse, and receives input such as start or end of various instructions.

The output unit 32 has, for example, a display, a speaker, or the like, and performs content input by the input unit 31, display of content or the like executed based on the input content, sound output, and the like.

The memory unit 33 stores information such as an output value of a pressing force or the like obtained by the sensor unit 20, a coordinate correction amount obtained in advance, or a value obtained by each unit.

The output ratio acquisition unit 34 totals the output values of the four strain gauges 23-1 to 23-4 obtained by the sensor unit 20, and obtains the respective strain gauges 23 with respect to the total output values ( The ratio of the output value of one of the strain gauges 23-1 to 23-4. Further, the output ratio acquisition unit 34 acquires the ratio of the obtained output values as the individual output ratio of each strain gauge 23.

For example, in the pre-processing, the output ratio acquisition unit 34 is based on the values of the strain gauges 23-1 to 23-4 obtained when the predetermined correction position (for example, 25 places) set at the interval between the correction target regions on the rectangle is pressed. The individual output ratios of the respective strain gauges 23 at the respective predetermined positions are obtained. Further, in the pressing position determination processing, the individual output ratios of the strain gauges 23 at the pressing point of the user are obtained based on the values of the strain gauges 23-1 to 23-4 obtained by the user's pressing.

It should be noted that the output ratio acquisition unit 34 can adjust the maximum value or the minimum value of the individual output ratios of the obtained strain gauges 23 to a predetermined value (for example, “100” or “0”). However, it is not limited to this.

Each of the side pressure acquiring means 35 uses a total of individual output ratios of two strain gauges 23 (for example, the strain gauge 23-1 and the strain gauge 23-2) at both ends of each side of the correction target region provided on the rectangular shape. The individual output ratios of the strain gauges 23 (for example, the strain gauges 23-1 and the strain gauges 23-2) respectively determine the pressures of the respective sides (for example, the upper side, the lower side, the right side, and the left side) constituting the correction target area on the rectangle. proportion.

Each of the side pressure acquiring means 35 can obtain, for example, the ratio of the pressure on each side on the predetermined position (for example, 16 of the above-mentioned 25 points which are in contact with the outer periphery of the rectangle) on each side in the pre-processing. Further, in the pressing position determination processing, the ratio of the pressure on each side at the pressing position of the user is obtained based on the individual output ratio of each strain gauge 23 obtained by the user's pressing.

The vertical horizontal direction pressure acquiring means 36 obtains the vertical direction or the horizontal direction of the rectangle (correction target region) by using the ratio of the pressures of the respective sides of the rectangle (correction target region) obtained by the respective side pressure acquiring means 35. The ratio of the pressure in the direction.

The vertical horizontal direction pressure acquiring unit 36 can obtain, for example, the ratio of the pressure in the vertical direction or the horizontal direction at a predetermined position (for example, the above-described 16 places) on each of the sides in the pre-processing. Further, in the pressing position determination processing, the ratio of the pressure in the vertical or horizontal direction at the pressing position of the user is obtained.

The displacement amount acquisition unit 37 uses the ratio of the pressure on each side obtained by each of the side pressure acquisition units 35 and the ratio of the pressure in the vertical direction or the horizontal direction obtained by the vertical horizontal direction pressure acquisition unit 36. The amount of displacement from each side of the rectangle (correction target area) at the pressed position is obtained.

The displacement amount acquisition unit 37 can obtain, for example, the ratio of the pressure on each side at a predetermined position (for example, the above-described 16 points) on each side and the ratio of the pressure in the vertical direction or the horizontal direction in the pre-processing. The amount of displacement from each side at a predetermined position on the side. Further, in the pressing position determination processing, the amount of displacement from each side at the pressing position of the user is obtained.

The coordinate correction amount acquisition unit 38 obtains the average value of the displacement amounts of the respective sides by, for example, the displacement amount from each side at a predetermined position on each side obtained by the displacement amount acquisition unit 37 in the pre-processing. Further, the coordinate correction amount acquisition unit 38 acquires the coordinate correction amount for setting the coordinates of the correction target region by using the average value of the displacement amounts of the respective sides.

Here, for example, the average value of the displacement amount on the left side and the average value of the displacement amount on the upper side are respectively obtained as reference points of the correction target region, and this is used as the coordinate correction amount. Further, by dividing a predetermined value (for example, "100") by the difference between the average value of the displacement amount on the left side and the average value of the displacement amount on the right side, the resolution between the left side and the right side of the correction target area is obtained. It is used as a coordinate correction. Further, similarly, the transmission is obtained by dividing a predetermined value (for example, "100") by the difference between the average value of the displacement amount of the upper side and the average value of the displacement amount of the lower side. Correct the resolution between the top and bottom of the object area and use it as the coordinate correction amount.

The coordinate correction amount acquisition unit 38 memorizes the coordinate correction amount (for example, the reference point having the correction target region and the scale of the resolution) thus obtained in the unit 33. It should be noted that the coordinate correction amount stored in the memory unit 33 is used in the pressed position determination processing in the pressed position determination unit 39.

The pressing position determining unit 39 determines the pressing position on the panel 20 using the individual output ratio of the strain gauge 23 obtained by the output ratio acquiring unit 34. Specifically, the pressing position determining unit 39 determines the displacement amount from each side obtained by the displacement amount acquiring unit 37 when the user presses the panel, and the coordinate correction amount obtained by the coordinate correction amount acquiring unit 38. Press the position.

The control unit 40 performs control of the entire components of the coordinate input device 10. The control unit 40 controls the output ratio acquisition unit 34, the respective side pressure acquisition units 35, the vertical horizontal direction pressure acquisition unit 36, the displacement amount acquisition unit 37, and the coordinate correction amount based on, for example, an instruction from the input unit 31 input by the user. The acquisition unit 38, the pressing position determination unit 39, and the like determine the pressing position of the panel 22.

<PC30: Hardware Configuration Example>

The PC 30 can generate a coordinate input program for causing a computer to execute each function or each unit, and execute it by installing it in, for example, a general-purpose personal computer or the like. Fig. 3 is a view showing an example of a hardware configuration of the PC of the present embodiment.

As shown in FIG. 3, the PC 30 has an input device 41, an output device 42, a drive device 43, an auxiliary memory device 44, a memory device 45, a CPU (Central Processing Unit) 46, a network connection device 47, and transmits through the system bus. B connects them to each other.

The input device 41 includes, for example, a pointing device such as a keyboard or a mouse operated by a user, and an operation signal for inputting a program from a user or the like.

The output device 42 has a GUI (Graphical User Interface) or a screen or the like required for operating the computer main body for performing each process of the present embodiment. The display displays the execution process or results of the program according to the control program of the CPU 46.

It should be noted that the input device 41 and the output device 42 may be integrated input/output devices such as a touch panel.

Here, the coordinate input program installed in the main body of the computer is provided by, for example, a portable memory medium 48 such as a USB memory or a CD-ROM. The memory medium 48 can be mounted in the drive unit 43, and the program included in the memory medium 48 is mounted from the memory medium 48 to the auxiliary memory unit 44 via the drive unit 43.

The auxiliary memory device 44 is a storage unit such as a hard disk, a memory coordinate input program, or a control program provided in a computer, and performs input and output as needed.

The memory device 45 stores a program or the like read from the auxiliary memory device 44 by the CPU 46. The memory device 45 uses a read only memory (ROM: Read Only Memory) and a random access memory (RAM: Random Access Memory).

The CPU 46 controls various arithmetic processing, input and output of data with each hardware component, and the like as a whole by a control program such as an operating system (OS: Operating System) and a program stored in the memory device 45. deal with. It should be noted that various information such as the execution of the program is acquired from the auxiliary memory device 44, and the execution result and the like are stored.

The network connection device 47 is connected to a communication network or the like, and acquires a program from another device connected to the communication network, or provides an execution result obtained by executing the program to another device.

The PC 30 has the above-described hardware configuration, so that the respective processes of the present embodiment can be performed.

<Sensor Correction (Pre-Processing)>

Next, the sensor calibration of the strain gauges 23-1 to 23-4 will be described. 4A to 4C are diagrams for explaining sensor correction corresponding to the variable.

As shown in FIG. 4A, the two strain gauges 23 of the four strain gauges 23-1 to 23-4 are respectively formed as rectangles by the four sides of the end portions, corresponding to the rectangular regions formed (that is, the correction target) Area The field) is provided with a rectangular panel 22.

In the example of FIG. 4A, the strain gauge 23 is provided at the end of the panel 22, and the side where the two strain gauges 23 are the ends corresponds to the side of the panel 22. Therefore, in the example of Fig. 4A, when a predetermined portion on the panel 22 in the rectangular area is pressed, the coordinates on the panel 22 can be obtained. In the present embodiment, the present invention is not limited thereto, and the shape of the rectangular region may not correspond to the shape of the panel 22 .

In the pre-processing, the rectangular area (i.e., the panel 22) is divided at a predetermined position (at the angle 25 of the square in the example of FIG. 4A) set in advance at equal intervals, and the coordinate value based on the division position is set. In other words, in the example of FIG. 4A, the rectangular area (ie, the panel 22) is divided into 16 parts, for example, points indicating (x, y) = (0, 0) to (4, 4) as coordinates. Example of setting.

The output ratio acquisition unit 34 acquires the output values obtained by the strain gauges 23-1 to 23-4 in a state (for example, 0 g) that is not carried on the panel 22 at a predetermined timing such as delivery or an instruction from the user. (Zero value a _0,n ) (n: the number of the strain gauge 23, 1, 2, 3, 4).

Next, as shown in FIG. 4B, the output ratio acquisition unit 34 places a predetermined weight (for example, 100 g) at coordinates (at the angle 25 of the above-mentioned square) in the above-described equally spaced corners on the panel 22. The state of the normal code, the output value c _cal,n (x,y) obtained by the strain gauges 23-1 to 23-4 (x=0,1,2,3,4, y=0,1) , 2, 3, 4).

Next, the output ratio acquisition unit 34 subtracts the zero value data a _0,n from the output value c _cal,n (x,y) in which the predetermined weight state is placed _, and obtains the output value d _cal,n (x, which is corrected by the zero value. y). In addition, the output value d _cal,n (x,y) which performed the zero value correction is computed by following formula (1).

[Number 1] d _cal,n (x,y)=c _cal,n (x,y)-a _0,n . . . (1)

Next, the output ratio acquisition unit 34 totals the output values d _cal,n (x,y) of the strain gauges 23-1 to 23-4 at the respective points of the coordinates set as described above, and corrects them by the following equation ( 2) to obtain the total output value _{D cal, n (x, y} ).

Further, the ratio of each of the output values d _cal,n (x,y) of the strain gauges 23-1 to 23-4 with respect to the total output value D _cal,n (x,y) is obtained by the following formula (3) e _cal,n (x,y).

As described above, the output ratio acquisition unit 34 takes the ratio e _cal,n (x,y) of the output values of the strain gauges 23-1 to 23-4 at the respective points of the set coordinates as the strain gauges 23 at the respective points of the coordinates. The individual output ratios e _cal,n (x,y) of -1~23-4 are obtained.

It should be noted that the output ratio obtaining unit 34 may set the difference between the maximum value and the minimum value of the individual output ratios e _cal,n (x,y) of the respective strain gauges 23-1 to 23-4 to a predetermined value (for example, In the manner of 100"), the correction value Val _cal,n (x, y) is obtained by the following formula (4).

Further, the output ratio obtaining unit 34 uses the correction values Val _cal,n (x,y) such that the respective output ratios e _cal,n (x,y) of the strain gauges 23-1 to 23-4 are the maximum and minimum. The value is a predetermined value (for example, "100", "0"), and the corrected value f _cal,n (x, y) is obtained by the following formula (5).

As described above, as the pre-processing, the sensor correction of the strain gauges 23-1 to 23-4 can be performed in advance, and the corrected values f _cal,n (x,y) of the strain gauges 23-1 to 23-4 are used. ), the coordinate correction amount for setting the coordinates of the rectangular area (correction target area) is obtained.

In the following description, as shown in FIG. 4C, the side where the strain gauges 23-1 and 23-2 are the end portions is the left side, and the strain gauges 23-2 and 23-3 are the end portions. The side is below. Further, the side where the strain gauges 23-3 and 23-4 are the end portions is the right side, and the side where the strain gauges 23-4 and 23-1 are the end portions is the upper side. In the following example, an example in which the panel 22 is provided in a rectangular region (that is, a correction target region) composed of the respective sides will be described.

<Flow of coordinate correction amount acquisition processing>

Next, the coordinate correction amount acquisition processing for setting the coordinates of the panel 22 (that is, the correction target region) executed in the above-described pre-processing will be described. Fig. 5 is a flowchart showing the flow of the coordinate correction amount acquisition processing of the present embodiment.

As shown in Fig. 5, the output ratio acquisition unit 34 first performs the above-described sensor correction at a predetermined time such as at the time of delivery or an instruction from the user.

The output ratio acquisition unit 34 acquires the zero-value data a _0,n (S10) from the strain gauges 23-1 to 23-4, and acquires the coordinate points that are equally spaced on the panel 22 (in the example of FIGS. 4A to 4C). An output value c _cal,n (x,y) at a predetermined weight (for example, 100 g) is placed at the corner 25 of the above-mentioned square) (S11), and an output value d _cal at which zero value correction is performed at each coordinate point is obtained _{. n (x, y) (S12} ).

Further, the output ratio acquisition unit 34 acquires the total output value D _cal each coordinate _location, the _n (x, y), acquired as to the total output value D _cal each coordinate _{location, n (x,} y) of the strain gauge 23 The individual output ratio e _cal,n (x,y) of the ratio of the respective output values d _cal,n (x,y) of -1 to 23-4 (S13).

Next, the output ratio acquisition unit 34 obtains the maximum value and the minimum value among the individual output ratios e _cal,n (x,y) of the strain gauges 23-1 to 23-4, and finds the maximum value and the minimum value. The difference between the values is a correction value Val _cal,n (x,y) of a predetermined value (for example, "100") (S14).

Next, the output ratio acquisition unit 34 uses the correction value Val _cal,n (x,y) for each strain gauge 23-1 in such a manner that the maximum value and the minimum value are respectively predetermined values (for example, "100", "0"). The individual output ratio e _cal,n (x,y) of ~23-4 is corrected, and the corrected value f _cal,n (x,y) is obtained (S15).

Next, each of the side pressure acquiring means 35 obtains, for example, a ratio U _cal (x, y) of the pressure on each side on a predetermined position of each side (for example, 16 of the above-described 25 points that are in contact with the outer circumference of the panel 22). B _cal (x, y), L _cal (x, y), R _cal (x, y) (S16). For example, each side pressure acquiring unit 35 acquires the ratio of the pressure on each side by the following formula (6).

[Number 3] U _cal (x, y) = f _{cal, 4} (x, y) / (f _{cal, 1} (x, y) + f _{cal, 4} (x, y)) B _cal (x, y) =f _cal,3 (x,y)/(f _cal,2 (x,y)+f _cal,3 (x,y)) L _cal (x,y)=f _cal,2 (x,y)/ _{(f cal, 1 (x,} y) + f cal, 2 (x, y)) R cal (x, y) = f cal, 3 (x, y) / (f cal, 3 (x, y) + f _cal,4 (x,y)). . . (6)

For example, when the ratio of the upper side on the coordinates (0, 0) is found, each side pressure obtaining unit 35 uses U _cal (0, 0) = f _{cal, 4} (0, 0) / (f _{cal, 1} ( 0,0)+f _cal,4 (0,0)). Similarly, the ratio of the pressure on the lower side, the left side, and the right side on the coordinates (0, 0) is obtained separately.

Then, the vertical horizontal direction pressure acquiring unit 36 obtains the ratio of the pressure on each side when the predetermined position is pressed, and obtains the predetermined position (for example, 16 points in the 25 places that are in contact with the outer circumference of the panel 22). The ratio of the pressure in the vertical direction V _cal (x, y) or the ratio of the pressure in the horizontal direction H _cal (x, y) (S17).

For example, the vertical horizontal direction pressure acquiring unit 36 obtains the ratio V _cal (x, y) about the pressure in the vertical direction or the ratio H _cal (x, y) about the pressure in the horizontal direction by the following formula (7).

[Equation 4] V _cal (x, y) = (f _{cal, 1} (x, y) + f _{cal, 4} (x, y)) / (f _{cal, 1} (x, y) + (f _{cal, 2} (x, y) + (f cal, 3 (x, y) + (f cal, 4 (x, y)) H cal (x, y) = (f cal, 1 (x, y) + f cal, ₂ (x,y))/(f _cal,1 (x,y)+(f _cal,2 (x,y)+( _fcal,3 (x,y)+(f _cal,4 (x,y)) )...(7)

Then, the displacement amount acquisition unit 37 obtains the above-described predetermined position by the following formula (8) using the ratio V _cal (x, y) about the pressure in the vertical direction or the ratio H _cal (x, y) about the pressure in the horizontal direction ( For example, the displacement amounts WX _cal (x, y) and WY _cal (x, y) from the respective sides on the 16th portion of the 25 which is in contact with the outer periphery of the panel 22 (S18).

[Number 5] WX _cal (x, y) = (U _cal (x, y) × (1 - V _cal (x, y)) + B _cal (x, y) × V _cal (x, y)) WY _Cal (x, y) = (L _cal (x, y) × (1 - H _cal (x, y)) + R _cal (x, y) × H _cal (x, y)). . . (8)

Next, the average value of the displacement amounts of the respective sides is obtained by the following formula (9) (S19).

[Number 6] Left: L _CX = average(WX _cal (0, y)) Upper side: U _Cy = average(WY _cal (x, 0)) Right: R _CX = average(WX _cal (4, y)) :B _Cy =average(WY _cal (x,4)) y=0,1,2,. . . , 4 x=0,1,2,. . . , 4. . . (9)

Here, for example, in the case of the left side, for example, the amount of displacement on the left side is obtained according to the displacement amounts on the points (0, 1), (0, 2), (0, 3), (0, 4) of the coordinates on the left side. Average value (Lcx=average(WX _cal (0,y))). Similarly, the average of the displacement amounts of the right side, the upper side, and the lower side is obtained based on the displacement amounts of the coordinates of the coordinates of the right side, the upper side, and the lower side.

Next, the coordinate correction amount acquisition unit 38 acquires a coordinate correction amount for setting the coordinates of the rectangular region (that is, the correction target region) (S20).

Here, the coordinate correction amount acquisition unit 38 uses, for example, the average value Lcx of the displacement amount on the left side as the reference point calXval, and the average value Ucy of the displacement amount on the upper side as the reference point calYval. Further, the coordinate correction amount acquisition unit 38 obtains the resolution calXscale whose difference is a predetermined value (for example, "100") by using the difference between the average value Lcx of the displacement amount on the left side and the average value Rcx of the displacement amount on the right side. In the same manner, the difference calyscale whose difference is a predetermined value (for example, "100") is obtained by using the difference between the average value Ucy of the upper displacement amount and the average value Bcy of the lower displacement amount.

In addition, the displacement amount determining unit 37 acquires the coordinate correction amount (reference point calXval, calYval, resolution calXscale, and the like, for example, by the following formula (10). calYscale).

[Number 7] calXval = L _CX calYval = U _Cy calXscale = 100 / (R _{CX -} L _CX ) calYscale = 100 / (B _Cy - U _Cy ). . . (10)

As described above, in the present embodiment, the coordinate correction amount for setting the coordinates of the correction target region is previously acquired in the pre-processing. Further, the obtained coordinate correction amount is stored in the memory unit 33 in advance, for example, and is used to press the position determination processing. In addition, in the present embodiment, the example of obtaining the coordinate correction amount is not limited to this.

<About the displacement amount obtaining formula>

Next, the equation (8) used when the above displacement amount is obtained will be described. Fig. 6 is a view for explaining an example of the idea of the displacement amount obtaining formula of the present embodiment.

As shown in Fig. 6, a method of acquiring the displacement amount WX (i.e., the X coordinate) from each side at the pressing position at the arbitrary position (for example, the pressing position A) of the pressing panel 22 will be described. Here, for example, the load ratio in the X direction (lateral direction) of the upper side and the lower side is added.

As described above, the ratio of the pressure on the upper side is expressed as U _cal =f _cal,4 /(f _cal,1 +f _cal,4 ), and the ratio of the pressure on the lower side is expressed as B _cal =f _cal,3 / (f _{cal, 2} + f _{cal, 3} ).

Here, for example, the ratio of the weight to the upper side of the whole and the ratio of the weight to the lower side of the whole are expressed as follows.

For example, the ratio of the weights to the upper side of the whole is V _cal =f _cal,1 +f _cal,4 /(f _cal,1 +f _cal,2 +f _cal,3 +f _cal,4 ). When the total of the ratios of the weights of the upper side and the lower side is set to "1", the ratio of the weights of the lower side can be expressed as 1-V _cal = f _{cal, 2} + f _{cal, 3} / (f _{cal, 1} + f _{cal, 2} +f _cal,3 +f _cal,4 ). It should be noted that V _cal is the same expression as that described above for the ratio of the pressure in the vertical direction.

Here, the pressure on the upper point P (U _cal , 0) when the pressing position A is pressed is f _{cal, 1} + f _{cal, 4} , and the pressure on the lower point Q (B _cal , 0) is set. Is f _{cal, 2} + f _{cal, 3} .

The X coordinate of the center of point P and point Q (i.e., the x coordinate of WX) can be expressed as follows. For example, when the masses m and n have the coordinates of the mass points a and b as (Xa, Ya) and (Xb, Yb), respectively, the coordinates (X, Y) for determining the center of gravity of the mass points a and b are obtained. The equation (that is, the equation of the mass point a of the mass m and the mass point b of the mass n), for example, X = (n × Xa + m × Xb) / (m + n), Y = (n × Ya + m × Yb) / (m + n), WX (x) = (U _cal × (f _{cal, 2} + f _{cal, 3} ) + B _cal × (f _{cal, 1} + f _{cal, 4} )) /(f _cal,2 +f _cal,3 +f _cal,1 +f _cal,4 )=U _cal ×(f _cal,2 +f _cal,3 )/(f _cal,2 +f _cal,3 +f _Cal,1 +f _cal,4 )+B _cal ×(f _cal,1 +f _cal,4 )/(f _cal,2 +f _cal,3 +f _cal,1 +f _cal,4 )=(U _cal ×(1-V _cal )+B _cal ×V _cal ). . . (11)

Similarly, the y coordinate of WX when the pressing position A is pressed can be expressed as follows.

WX(y)=(0×(f _cal,2 +f _cal,3 )+1×(f _cal,1 +f _cal,4 ))/(f _cal,2 +f _cal,3 +f _cal,1 +f _cal,4 )=f _cal,1 +f _cal,4 /(f _cal,2 +f _cal,3 +f _cal,1 +f _cal,4 )=V _cal

According to the above WX(x) and WX(y), WX(x, y) is expressed as follows.

WX(x,y)=(U _cal ×(1-V _cal )+B _cal ×V _cal ,V _cal )

Therefore, the X coordinate of the pressing position A to which the horizontal weight ratio of the upper side and the lower side is added can be expressed as U _cal ×(1 - V _cal ) + B _cal × V _cal .

Hereinafter, a method of acquiring the displacement amount WY (that is, the Y coordinate) from each side at the pressing position A when the pressing position A is pressed will be described. Here, for example, the ratio of the load ratios of the right and left Y directions (longitudinal directions) is added.

As described above, the ratio of the pressure on the left side is expressed as L _cal = f _{cal, 2} / (f _{cal, 1} + f _{cal, 2} ), and the ratio of the pressure on the right side is expressed as R _cal = f _{cal, 3} / _{(f cal, 3 + f cal} , 4).

Here, for example, the ratio of the weight to the left of the whole and the ratio of the weight to the right of the whole are expressed as follows.

For example, the ratio of the weights to the left of the whole is H _cal =f _cal,1 +f _cal,2 /(f _cal,1 +f _cal,2 +f _cal,3 +f _cal,4 ). When the total of the ratios of the weights of the left and right sides is set to "1", the ratio of the weights on the right side can be expressed as 1-H _cal = f _{cal, 3} + f _{cal, 4} / (f _{cal, 1} + f _{cal, 2} +f _cal,3 +f _cal,4 ). It should be noted that Hcal is the same expression as that described above for the ratio of the pressure in the horizontal direction.

Here, the pressure on the left point P'(0, L _cal ) when the pressing position A is pressed is set to f _cal,1 +f _cal,2 , which will be about the right point Q'(1, R _cal ) The pressure is set to f _cal,3 +f _cal,4 .

According to the equation in which the mass point a of the mass m and the mass point b of the mass n are divided, the Y coordinate of the center of the point P' and the point Q' (i.e., the y coordinate of WY) can be expressed as follows.

WY(y)=(L _cal ×(f _cal,3 +f _cal,4 )+R _cal ×(f _cal,1 +f _cal,2 ))/(f _cal,3 +f _cal,4 +f _{cal , 1} +f _cal,2 )=L _cal ×(f _cal,3 +f _cal,4 )/(f _cal,3 +f _cal,4 +f _cal,1 +f _cal,2 )+R _cal ×( f _cal,1 +f _cal,2 )/(f _cal,3 +f _cal,4 +f _cal,1 +f _cal,2 )=(L _cal ×(1-H _cal )+R _cal ×H _cal )

Similarly, the x coordinate of the displacement amount WY when the pressing position A is pressed can be expressed as follows.

WY(x)=(0×(f _cal,3 +f _cal,4 )+1×(f _cal,1 +f _cal,2 ))/(f _cal,3 +f _cal,4 +f _{cal,1 + f cal, 2) = f} cal, 1 + f cal, 2 / (f cal, 3 + f cal, 4 + f cal, 1 + f cal, 2) = H cal

According to the above WY(x) and WY(y), WY(x, y) is expressed as follows.

WY(x,y)=(H _cal ,L _cal ×(1-H _cal )+R _cal ×H _cal )

Therefore, the Y coordinate of the pressing position A, to which the weight ratio of the vertical direction on the left and right sides is added, can be expressed as L _cal × (1 - H _cal ) + R _cal × H _cal .

It should be noted that the above WX and WY can also be obtained as follows.

For example, in the case of WX, the left end of the upper side shown in Fig. 6 is the coordinate (x1, y1), the left end of the lower side is the coordinate (x1, y1+1), and the right end of the upper side is the coordinate (x4, y4). Set the right end of the lower side to the coordinates (x4, y4+1).

Here, it is assumed that the coordinates of the above point P are (Px, Py), and the ratio of the pressure from the upper coordinate (x1, y1) to the point P is f _{cal, 1} / (f _{cal, 1} + f _{cal, 4} ) The ratio of the pressure from the point P to the upper coordinate (x4, y4) is f _{cal, 4} / (f _{cal, 1} + f _{cal, 4} ).

Further, it is assumed that the coordinates of the above point Q are (Qx, Qy), and the ratio of the pressure from the lower coordinate (x1, y1+1) to the point Q is f _{cal, 2} / (f _{cal, 2} + f _{cal, 3} The ratio of the pressure from the point Q to the lower coordinate (x4, y4+1) is f _{cal, 3} / (f _{cal, 2} + f _{cal, 3} ).

At this time, Px and Qx can be expressed as follows, respectively.

Px=x1+(x4-x1)×f _cal,1 /(f _cal,1 +f _cal,4 )

Qx=x1+(x4-x1)×f _cal,2 /(f _cal,2 +f _cal,3 )

Therefore, WX can be expressed as follows.

WX=Px×(f _cal,2 +f _cal,3 )/(f _cal,1 +f _cal,2 +f _cal,3 +f _cal,4 )+Qx×(f _cal,1 +f _cal,4 /(f _cal,1 +f _cal,2 +f _cal,3 +f _cal,4 )=Px×(1-V)+Qx×V. . . (12)

Since the above formula (12) is equivalent to the above formula (11), WX can be obtained by the above method. Further, the case of WY can also be obtained by the same method as in the case of the above-described WX.

<Other examples for explaining the displacement amount acquisition formula>

Further, the equation (8) used when the above displacement amount is obtained will be described by another method. For example, in the example of Fig. 6, it is assumed that P from the left to the point P is P(x), and from the left to the point Q is Q. (x), from the left to the pressed position A is X(x).

Further, the intersection from the line drawn from the point P perpendicularly to the lower side and the line drawn from the left side by the pressing position A to the right side is set to a (x) to the pressing position A. Further, it is assumed that the intersection with the lower side and the point Q from the upper side by the pressing position A to the lower side are b(x).

At this time, the X coordinate of the pressing position A can be expressed by the following method.

If a(x): V=b(x): (1-V), then a(x)×(1-V)=b(x)×V=(Q(x)-P(x) -a(x))×V=Q(x)×VP(x)×Va(x)×V

a(x)×(1-V)+a(x)×V=Q(x)×V-P(x)×V

a(x)-(a(x)×V)+(a(x)×V)=Q(x)×V-P(x)×V

a(x)=Q(x)×V-P(x)×V

That is, X(x)=P(x)+a(x)=P(x)-P(x)×V+Q(x)×V=P(x)×(1-V)+Q( x)×V

Or, a(x):V=(a(x)+b(x)):1

a(x)=(a(x)×V)+(b(x)×V)

a(x)-(a(x)×V)=b(x)×V=(Q(x)-P(x)-a(x))×V=Q(x)×VP(x)× V

That is, X(x)=P(x)+a(x)=P(x)-P(x)×V+Q(x)×V=P(x)×(1-V)+Q( x)×V. . . (13).

Since the above formula (13) is equivalent to the above formulas (11) and (12), the above method can be used to obtain WX. Also, for WY, it is also possible to use the above WX. The same method is used to find out.

In the present embodiment, the displacement amount WX and WY from each side at the pressing position when pressed by the user is obtained by using the equation for obtaining the displacement amount, and the pressing position can be determined.

<Flow of pressing position determination processing>

Next, the pressing position determination processing when the user presses the panel 22 (that is, the correction target region) will be described. Fig. 7 is a flowchart showing the flow of the pressing position determination processing of the present embodiment. The processing of S21 to S26 in Fig. 7 is executed by the method used in the processing of S12 to S13 and S15 to S18 in Fig. 5 .

In addition, in order to set a coordinate on a rectangle with respect to the process of FIG. 5, a predetermined weight is placed in predetermined positions on the rectangle (for example, 25 points divided at equal intervals), thereby obtaining a predetermined position when pressing the predetermined position. The amount of displacement; the processing of Fig. 7 differs in the amount of displacement obtained from the output values obtained by the four strain gauges 23-1 to 23-4 when pressed by the user.

As shown in FIG. 7, in the actual measurement, when the user's press is detected, the output ratio acquisition unit 34 subtracts the output values of the strain gauges 23-1 to 23-4, respectively, in the fifth diagram. The zero value data a obtained in the processing obtains the zero value corrected output value d _cal (S21).

Next, the output ratio acquisition unit 24 obtains the total output value D _cal based on the four output values d _cal acquired in the process of S21, and acquires the strain gauges 23-1 to 23-4 as the total output value D _cal . The individual output ratios e _cal (S22) of the ratio of the respective output values.

Next, the output ratio acquisition unit 34 obtains the maximum value and the minimum value among the individual output ratios e _cal of the strain gauges 23-1 to 23-4, and sets the maximum value and the minimum value to predetermined values (for example, "100"). The mode of "0" is corrected by the correction value Val _cal obtained in the process of S14 of the fifth drawing, and the corrected value f _{cal is obtained} (S23).

Next, each side of the pressure acquiring means 35, in the process of S23 by using the acquired correction values. 4 Val _cal, U _cal ratio is obtained on each side of the _{pressure, B cal, L cal, R} cal (S24).

Next, the vertical and horizontal direction pressure obtaining unit 36 obtains the pressure on the pressure ratio of the vertical direction or the horizontal direction V _cal ratio H _cal (S25).

Next, the displacement amount acquisition unit 37 acquires the displacement amounts WX _cal and WY _cal from the respective sides (S26).

Next, the pressing position determining unit 39 uses the coordinate correction amount (for example, the reference points calXval, calYcal, the resolution calXscale, and the calYscale) acquired in advance in the processing of FIG. 5 to shift the displacement amount from each side obtained in the example of S26. Wx _cal and WY _cal are corrected to obtain correction values Xp and Yp (S27). It should be noted that the pressing position determining unit 39 can also obtain the correction values Xp and Yp using, for example, the following formula (14).

[8] Xp = (WX _{cal -} calXval) × calXscale Yp = (WY _{cal -} calYval) × calYscale. . . (14)

Next, the pressing position determining unit 39 takes the correction values Xp and Yp as displacements from the center coordinates of the panel 22, and thus obtains a difference value from a predetermined value (for example, "50" when dividing the diagonal line by 100 copies). The position offset values calXposOffset and calYposOffset (S28) are obtained.

It should be noted that the pressing position determining unit 39 can also obtain, for example, the positional shift values calXposOffset and calYposOffset by the following formula (15).

[Number 9] calXposOffset=50-Xp calYposOffset=50-Yp. . . (15)

Then, by adding the position offset values calXposOffset and calYposOffset, the coordinates Xpos and Ypos as the pressed positions are obtained (S29). It should be noted that the pressing position determining unit 39 can also determine the coordinates Xpos and Ypos by the following formula (16).

[Number 10] Xpos=Xp+calXposOffset Ypos=Yp+calYposOffset. . . (16)

In this manner, the coordinate correction amount for setting the coordinates obtained by the sensor correction at the time of shipment is determined, and the pressing position on the panel 22 pressed by the user at the time of measurement can be determined.

As described above, according to the present embodiment, the pressing position on the panel can be accurately detected.

The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the specific embodiments, and various modifications and changes can be made without departing from the spirit and scope of the invention.

The present application claims the priority of Japanese Patent Application No. 2013-014820, filed Jan.

22‧‧‧ panel

23‧‧‧ strain gauge

Claims (21)

A coordinate input device, comprising: four pressure sensors disposed at predetermined positions of the panel; and an output ratio acquisition unit that performs output values obtained by the four pressure sensors In total, the ratio of the output value of the pressure sensor relative to the total output value is obtained for each of the pressure sensors, and the ratio of the obtained output values is used as an individual of each of the pressure sensors. And an output position determining unit that determines a pressing position for the panel by using an individual output ratio of each of the pressure sensors obtained by the output ratio acquiring unit and a coordinate correction amount obtained in advance . The coordinate input device of claim 1, wherein there is a side pressure obtaining unit that forms a rectangle by respectively using four sides of the four pressure sensors as four end portions. And determining the pressure of each side of the rectangle by using the respective individual output ratios of the two pressure sensors of the total of the individual output ratios of the two pressure sensors provided at both ends of each side. proportion. The coordinate input device of claim 2, wherein there is a vertical horizontal direction pressure obtaining unit that utilizes pressure on the upper and lower sides of the rectangle or the left or right side of the rectangle obtained by the respective side pressure obtaining units The ratio is calculated to find the ratio of the pressure in the vertical direction or the horizontal direction of the rectangle. The coordinate input device of claim 3, wherein there is a displacement amount acquisition unit that utilizes a ratio of pressure with respect to the sides and a pressure with respect to a vertical direction or a horizontal direction obtained by the vertical horizontal direction pressure acquisition unit The ratio is taken to obtain the amount of displacement from the sides of the pressed position. The coordinate input device of claim 4, wherein there is a target correction amount acquisition unit that uses the offset amount acquisition unit to obtain a predetermined value on each side The coordinate correction amount for setting the coordinates on the rectangle is obtained by averaging the displacement amounts from the respective sides at a plurality of pressing positions. The coordinate input device of claim 5, wherein the pressing position determining unit uses the displacement amount of the pressing position obtained by the displacement amount obtaining unit from the sides and the coordinate correction amount obtaining unit The coordinate correction amount is used to determine the pressing position when the panel is pressed. The coordinate input device of claim 1, wherein the output ratio acquisition unit adjusts the individual output ratio such that a maximum value or a minimum value of the individual output ratios of the pressure sensors is a predetermined value. A coordinate input method performed by a computer, comprising: an output ratio obtaining step of summing output values obtained by four pressure sensors disposed at predetermined positions of a panel, for each The pressure sensor obtains a ratio of an output value of the pressure sensor with respect to the total output value, and obtains a ratio of the obtained output value as an individual output ratio of each of the pressure sensors. And a pressing position determining step of determining a pressing position for the panel by using an individual output ratio of each of the pressure sensors obtained by the output ratio obtaining step and a coordinate correction amount obtained in advance. The coordinate input method of claim 8, wherein there is a side pressure obtaining step of forming a rectangle by respectively using four sides of the four pressure sensors as four end portions And determining the pressure of each side of the rectangle by using the respective individual output ratios of the two pressure sensors of the total of the individual output ratios of the two pressure sensors provided at both ends of each side. proportion. The coordinate input method of claim 9, wherein there is a vertical horizontal direction pressure obtaining step of utilizing the pressure on the upper and lower sides of the rectangle or the left or right side of the rectangle obtained by the edge pressure obtaining steps Ratio The ratio of the pressure in the vertical direction or the horizontal direction of the rectangle. The coordinate input method of claim 10, wherein there is a displacement amount obtaining step that utilizes a ratio of pressure with respect to the sides and a pressure with respect to a vertical direction or a horizontal direction obtained by the vertical horizontal direction pressure obtaining step The ratio is taken to obtain the amount of displacement from the sides of the pressed position. The coordinate input method of claim 11, wherein there is a target correction amount obtaining step of using an average of the displacement amounts of the plurality of pressing positions preset on the sides obtained by the displacement amount obtaining step The value is used to obtain the coordinate correction amount for setting the coordinates on the rectangle. The coordinate input method of claim 12, wherein the pressing position determining step uses the displacement amount of the pressing position obtained from the displacement position obtained by the displacement amount obtaining step, and the coordinate correction step obtaining step The coordinate correction amount is used to determine the pressing position when the panel is pressed. The coordinate input method of claim 8, wherein the output ratio obtaining step adjusts the individual output ratio in such a manner that a maximum value or a minimum value of the individual output ratios of the pressure sensor is a predetermined value. A computer readable storage medium accommodating a program for causing a computer to execute a standard input method, wherein the coordinate input method has an output scale obtaining step, which is set at a predetermined position on the panel The output values obtained by the four pressure sensors are totaled, and the ratio of the output value of the pressure sensor with respect to the total output value is obtained for each of the pressure sensors, and the obtained value is obtained. a ratio of the output values is obtained as an individual output ratio of each of the pressure sensors; and a pressing position determining step of utilizing the individual output ratios of the respective pressure sensors obtained by the output ratio obtaining step and obtaining in advance The coordinate correction amount is used to determine the pressing position for the panel. The memory medium of claim 15, wherein the coordinate input method has a side pressure obtaining step by using four pressure sensors respectively as the end of the four pressure sensors To form a rectangle, and to obtain the respective sides of the rectangle by using the respective individual output ratios of the two pressure sensors with respect to the total of the individual output ratios of the two pressure sensors provided at both ends of each side. The ratio of the pressure. The memory medium of claim 16, wherein the coordinate input method has a vertical horizontal direction pressure obtaining step of utilizing the upper and lower sides of the rectangle obtained by the edge pressure obtaining steps, or the left side of the rectangle or The ratio of the pressure on the right side is used to find the ratio of the pressure in the vertical direction or the horizontal direction of the rectangle, respectively. The memory medium of claim 17, wherein the coordinate input method has a displacement amount obtaining step that utilizes a ratio of pressures of the sides and a vertical direction or level obtained by the vertical horizontal direction pressure obtaining step The ratio of the pressure in the direction is obtained to obtain the amount of displacement from the sides of the pressed position. The memory medium of claim 18, wherein the coordinate input method has a target correction amount obtaining step of utilizing the displacement of the plurality of pressing positions preset on the sides obtained by the displacement amount obtaining step The average of the quantities is used to obtain the coordinate correction amount for setting the coordinates on the rectangle. The memory medium of claim 19, wherein the pressing position determining step uses the displacement amount of the pressing position obtained from the displacement position obtained by the displacement amount obtaining step and the step obtained by the coordinate correction amount obtaining step The coordinate correction amount is used to determine the pressing position when the panel is pressed. The memory medium of claim 15, wherein the output ratio obtaining step adjusts the individual output ratio such that a maximum value or a minimum value of the individual output ratios of the pressure sensor is a predetermined value.