KR102091405B1 - Tilt Calculation Device And Tilt Calculation Method - Google Patents

Abstract

An object of the present invention is to provide a slope derivation device and a slope derivation method capable of accurately deriving an inclination of an indicator.
The tilt derivation device according to the present invention is a tilt derivation device for deriving the inclination of a pen-shaped indicator, wherein the indicator includes a first electrode installed at one end in the axial direction and a second electrode installed around the axis, A sensor on a plane that detects the position of the first electrode and the position of the second electrode, and a control unit 10, wherein the control unit 10 is placed on the sensor from an orthogonal direction orthogonal to the sensor. The first input value corresponding to the value calculated based on the position of each of the first and second electrodes when tilted toward the first direction and the first correction value Θ _{1 which} is a correction value of the tilt of the axis The first look-up table 15A in which the corresponding relationship is registered, and the position of each of the first and second electrodes when the indicator is tilted toward a second direction different from the first direction on the sensor background A second lookup table 15B in which a corresponding relationship between a second input value corresponding to the calculated value and a second correction value Θ _{2 which} is a correction value of the tilt of the axis is registered, and each of the first and second electrodes An input calculation unit 14 that calculates an input value based on the position of and inputs the first and second lookup tables 15A and 15B as the first and second input values, and the first and second Based on the position of each of the two electrodes, a rotation angle calculator 16 for deriving a rotation angle Φ of the axis from the first direction toward the second direction, the rotation angle Φ and the first And an inclination direction inclination correction value calculation unit for calculating a correction value (θ _c ) of an inclination inclination which is an inclination of the axis from the orthogonal direction toward the inclined direction from the second correction values Θ ₁ and Θ ₂ . It provides a slope derivation device having a (17).

Description

Tilt Calculation Device and Tilt Calculation Method

The present invention relates to a slope derivation apparatus and a slope derivation method.

In recent years, on a display device such as a liquid crystal panel, a position detection device such as a touch panel, in which a sensor such as a touch pad for detecting a specified position on the display device is combined, is widely used.

The input to the position detecting device may be performed using, for example, a stylus pen on a tip with a sharp tip when an accurate input to the position detecting device is required. Currently, various types of stylus pens are used, but among them, stylus pens having an active electrostatic coupling method have been widely used.

The active electrostatic coupling stylus pen 101 as shown in FIG. 11 includes a plurality of, for example, two first electrodes 101a and a second electrode 101b, and a driving not shown to drive them. It has a circuit. The first electrode 101a is provided at one end of the stylus pen 101 in the direction of the axis C, and the second electrode 101b is around the axis C, for example, as if it surrounds the axis C. It is installed in a shape. The position indicated by the stylus pen 101 is detected by the sensor 100a on the position detecting device 100 receiving the signal transmitted by each of the electrodes 101a and 101b driven by the driving circuit by electrostatic coupling. do.

Patent Document 1 discloses such a support, a position detecting device, and a position detecting method.

Depending on the stylus pen, that is, an application program operating on the position detecting device using the indicator and the position detecting device, the inclination of the indicator with respect to the position detecting device may be required as input. In this case, generally, the detection coordinates of the first electrode 101a on the XY plane are A, the detection coordinates of the second electrode 101b are B, and the first in the axis C direction of the indicator 101. When the distance between the electrode 101a and the second electrode 101b is L, the slope of the axis C is derived by an operation based on these values.

Patent Document 1: Japanese Patent Publication No. 2011-164801

When using the indicator 101 as shown in FIG. 11, the first electrode 101a is close to the position detecting device 100, but the second electrode 101b is the height H from the position detecting device 100 It is located as far away. Therefore, compared to the first electrode 101a, the second electrode 101b has a smaller detection value by the sensor 100a.

Also, as described above, the second electrode 101b is formed in a ring shape around the axis C, such as surrounding the axis C, and is formed in a larger volume compared to the first electrode 101a. The range that 100a detects as the second electrode 101b is large.

As described above, the sensor 100a detects an area where a small detection value is widely distributed as a position of the second electrode 101b. Therefore, it is not easy for the position detection device 100 to accurately specify the detection coordinate B of the second electrode 101b, which is the basis of the above-described slope calculation.

Since the second electrode 101b is provided in a ring shape around the axis C, for example, surrounding the axis C, the position detecting device 100 detects the position of the second electrode 101b. The shape of the region to be changed varies according to the inclination of the indicator 101, and does not become a constant shape. Therefore, it is not easy to specify the coordinate B based on the shape of the region corresponding to the second electrode 101b, for example.

Further, the second electrode 101b is provided at a position with a constant distance from the axis C. Therefore, according to the inclination of the indicator 101, the value of the distance L between the electrodes 101a and 101b to be taken into account in calculation needs to be treated as an effective value that changes strictly.

Moreover, as described above, the detection value of the second electrode 101b by the sensor 100a is a small value. Therefore, when any noise is involved, the noise greatly affects the identification of the coordinates B, making it more difficult.

Since the above factors act synergistically and it is difficult to accurately specify the coordinates B, the specified values of the coordinates B tend to include errors. As a result, based on the value of the coordinate B specified as described above, the precision of the slope purely derived by the theoretical formula is not high.

Generally, the sensor 100a is formed by a plurality of conductors extending in each of two orthogonal directions. Each of these conductors has a predetermined width, and conductors overlap each other, and one unit 102 is formed in each of the portions where the conductors extending in different directions intersect.

The length 102x in the X direction and the length 102y in the Y direction of this single unit 102 may differ depending on the number of conductors in both XY directions and the like. The lengths 102x and 102y of one unit 102 can also depend on the resolution in both XY directions when the position detection device 100 is a display device. Accordingly, in the XY bi-direction, a difference may occur in the sensitivity of one unit 102.

In this case, even if the indicator 101 is tilted by the same angle in each of the X and Y directions, different values can be detected. That is, if the length of one unit 102 of the sensor is different in the X direction and the Y direction, the precision of the resulting slope can be further reduced.

The problem to be solved by the present invention is to provide a slope derivation apparatus and a slope derivation method capable of accurately deriving an inclination of an indicator.

The tilt derivation device according to the present invention is a tilt derivation device for deriving the inclination of a pen-shaped indicator, wherein the indicator includes a first electrode installed at one end in the axial direction and a second electrode installed around the axis, A planar sensor for detecting the position of the first electrode and the position of the second electrode, and a control unit, wherein the control unit tilts the indicator from the orthogonal direction orthogonal to the sensor toward the first direction on the sensor. A first lookup table in which a corresponding relationship between a first input value corresponding to a value calculated based on the position of each of the first and second electrodes and a first correction value that is a correction value of the tilt of the axis is registered And a value calculated based on the position of each of the first and second electrodes when the indicator is tilted toward a second direction different from the first direction on the sensor. Compute the input value based on the position of each of the first and second electrodes and a second lookup table in which a corresponding relationship between a second input value corresponding to and a second correction value which is a correction value of the tilt of the axis is registered, , Based on the position of each of the first and second electrodes as an input calculation unit input to the first and second lookup tables as the first and second input values, and from the first direction to the second direction From the rotation angle and the first and second correction values, the rotation angle calculation unit deriving the rotation angle of the axis toward the correction value of the inclination direction slope which is the inclination of the axis toward the direction in which the axis is inclined from the orthogonal direction It is provided with a slope correction value calculation unit for calculating the inclination direction.

According to the above configuration, the position of each of the first and second electrodes may be determined by factors such as a weak detection value due to the second electrode being away from the sensor and a small detection range due to the shape of the second electrode. Even if the input value calculated on the basis is that it contains a large amount of errors, the correction values that have been resolved corresponding to the errors are stored in the first and second lookup tables, and the correction values are calculated in the slope gradient correction value calculation unit. That is, from the first and second correction values output from the first and second lookup tables, a correction value of the gradient in the gradient direction is calculated. Therefore, it is possible to improve the precision of the slope in the calculated inclination direction, and to accurately derive the slope of the indicator.

In addition, the first and second lookup tables store first and second correction values that are tilt correction values of the axis when the indicator is tilted toward each of the different first and second directions. Moreover, the inclination direction tilt correction value calculation unit calculates the correction values of the inclination direction gradient based on the first and second correction values and the rotation angle of the axis from the first direction to the second direction calculated by the rotation angle calculation unit. To calculate. That is, in which direction the axis is inclined between the first direction and the second direction, the correction value when tilted in the first direction and the correction value when tilted in the second direction, for example, segment ) By processing or the like, it is possible to calculate the correction value of the gradient in the oblique direction. In this way, even if the length and sensitivity of one unit of the sensor are different in the first direction and the second direction, it is possible to improve the accuracy of the calculated tilt inclination direction and to accurately derive the inclination of the indicator.

In one aspect of the present invention, the inclination direction tilt correction value calculation unit, the correction of the inclination direction gradient by the separation processing between the first correction value and the second correction value according to the value of the rotation angle Calculate the value.

According to the above-described configuration, for both the first correction value when the axis is tilted in the first direction and the second correction value when tilted in the second direction, separation processing is performed according to the value of the rotation angle. Therefore, each of the first correction value and the second correction value can be appropriately reflected when calculating the correction value of the gradient in the gradient direction. In this way, even if the length and sensitivity of one unit of the sensor are different in the first direction and the second direction, it is possible to improve the accuracy of the calculated tilt inclination direction and to accurately derive the inclination of the indicator.

In another aspect of the present invention, the inclination direction tilt correction value calculation unit converts the rotation angle into an angle between the first direction and the second direction to calculate a conversion value, and based on the conversion value, An essence treatment is performed.

According to the above structure, since the rotation angle is converted into an angle between the first direction and the second direction, the separation process can be appropriately performed. In this way, even if the length and sensitivity of one unit of the sensor are different in the first direction and the second direction, it is possible to improve the accuracy of the calculated tilt inclination direction and to accurately derive the inclination of the indicator.

In another aspect of the present invention, the input calculation unit includes a distance on a sensor that is a distance of the position of each of the first and second electrodes on the sensor, and the first electrode in the axial direction and the The input value is calculated by dividing by the axial distance that is the distance of the second electrode.

According to the above-described configuration, since a complicated operation such as a trigonometric function is not required when calculating the input value, the calculation amount and the memory amount can be reduced.

In another aspect of the present invention, based on the correction value of the inclination direction inclination calculated by the inclination direction inclination correction value calculator, a first direction inclination that is an inclination of the axis from the orthogonal direction to the first direction, A first and second direction inclination calculator is further provided to derive a second direction inclination that is the inclination of the axis from the orthogonal direction toward the second direction.

According to the above structure, it is possible to derive the first direction slope and the second direction slope with high precision.

In another aspect of the present invention, the inclination direction gradient correction value calculation unit outputs the calculated correction value of the inclination direction gradient as the inclination direction gradient.

According to the above-described configuration, it is possible to derive a slope in a high-precision inclination direction.

In addition, the method for deriving a slope according to the present invention is a method for deriving a slope indicated by a pen-shaped indicator, and includes a first electrode installed at one end in the axial direction of the indicator by a planar sensor, and surrounding the axis The position of each of the second electrodes installed as described above is detected, the input value is calculated based on the positions of each of the first and second electrodes, and the first direction on the sensor is calculated from an orthogonal direction orthogonal to the sensor. A first relationship in which a corresponding relationship between a first input value corresponding to a value calculated based on the position of each of the first and second electrodes when tilted toward the first correction value, which is a correction value of the tilt of the axis, is registered In the lookup table, the input value is input as the first input value, and the indicator is tilted toward a second direction different from the first direction on the sensor. In the second lookup table in which the corresponding relationship between the second input value corresponding to the value calculated based on the position of each of the first and second electrodes and the second correction value that is the correction value of the tilt of the axis is registered, Input the input value as the second input value, derive a rotation angle of the axis from the first direction toward the second direction based on the position of each of the first and second electrodes, and the rotation angle and , From the first and second correction values output from the first and second lookup tables, a correction value of an inclination direction gradient that is an inclination of the axis from the orthogonal direction toward the inclination direction of the axis is calculated.

According to the above-described method, the position of each of the first and second electrodes may be determined by factors such as a weak detection value due to the second electrode being separated from the sensor and a small detection range due to the shape of the second electrode. Even if the input value calculated on the basis of the error includes a large amount of errors, the correction values that have been resolved corresponding to the errors are stored in the first and second lookup tables, and the correction values, that is, the first and second lookup tables From the output first and second correction values, a correction value of the gradient in the gradient direction is calculated. Therefore, it is possible to improve the precision of the slope in the calculated inclination direction, and to accurately derive the slope of the indicator.

In addition, the first and second lookup tables store first and second correction values that are correction values of the tilt of the axis when the indicator is tilted toward each of the different first and second directions. Moreover, based on these first and second correction values and the rotation angle of the axis from the first direction to the second direction calculated by the rotation angle calculation unit, the correction values of the inclination direction are calculated. That is, in which direction the axis is inclined between the first direction and the second direction, the correction value when tilted in the first direction and the correction value when tilted in the second direction, for example, separation processing, etc. By doing so, it is possible to calculate the correction value of the gradient in the oblique direction. In this way, even if the length and sensitivity of one unit of the sensor are different in the first direction and the second direction, it is possible to improve the accuracy of the calculated tilt inclination direction and to accurately derive the inclination of the indicator.

In one aspect of the present invention, the correction value of the inclination in the oblique direction is calculated by a division process between the first correction value and the second correction value according to the value of the rotation angle.

According to the method described above, for both the first correction value when the axis is tilted in the first direction and the second correction value when tilted in the second direction, separation processing is performed according to the value of the rotation angle. Therefore, each of the first correction value and the second correction value can be appropriately reflected when calculating the correction value of the gradient in the gradient direction. In this way, even if the length and sensitivity of one unit of the sensor are different in the first direction and the second direction, it is possible to improve the accuracy of the calculated tilt inclination direction and to accurately derive the inclination of the indicator.

In another aspect of the present invention, the rotation angle is converted to an angle between the first direction and the second direction to calculate a conversion value, and the separation process is performed based on the conversion value.

According to the method described above, since the rotation angle is converted into an angle between the first direction and the second direction, the separation process can be appropriately performed. In this way, even if the length and sensitivity of one unit of the sensor are different in the first direction and the second direction, it is possible to improve the accuracy of the calculated tilt inclination direction and to accurately derive the inclination of the indicator.

In another aspect of the present invention, the distance on the sensor that is the distance of the position of each of the first and second electrodes on the sensor is the distance between the first electrode and the second electrode in the axial direction. Divided by the distance in the axial direction, the input value is calculated.

According to the above method, since a complicated operation such as a trigonometric function is not required when calculating the input value, the calculation amount and the memory amount can be reduced.

In another aspect of the present invention, based on the correction value of the inclination in the inclined direction, the first inclination inclination of the axis from the orthogonal direction toward the first direction and the inclination in the orthogonal direction toward the second direction A second direction gradient, which is the tilt of the axis, is derived.

According to the above-described method, it is possible to derive the first direction slope and the second direction slope with high precision.

In another aspect of the present invention, the calculated correction value of the inclined direction slope is output as the inclined direction slope.

According to the above method, it is possible to derive a slope in a high-precision inclination direction.

According to the present invention, it is possible to provide a slope derivation apparatus and a slope derivation method capable of accurately deriving the slope of the indicator.

BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing of the inclination derivation apparatus in this embodiment of this invention, and the indicator used together.
It is explanatory drawing of the inclination derivation apparatus in the said embodiment.
3 is a signal processing block diagram of the control unit of the gradient derivation device in the above embodiment.
4 is an explanatory diagram of the central calculation unit of the control unit of the gradient derivation device in the above embodiment.
5 is an explanatory diagram of a coordinate system according to a tilt derivation device in the above embodiment.
Fig. 6 is an example of a first look-up table of the slope derivation device in the above embodiment.
Fig. 7 is an example of a second lookup table of the tilt derivation device in the above embodiment.
8 is an explanatory diagram of experimental results in the above embodiment.
9 is a signal processing block diagram of a control unit in a modification of the above embodiment.
10 is a partial signal processing block diagram of a control unit in another modification of the above embodiment.
11 is an explanatory diagram of a tilt derivation device and an indicator.

The tilt derivation device in this embodiment is a tilt derivation device for deriving the inclination of a pen-shaped indicator, wherein the indicator includes a first electrode provided at one end in the axial direction and a second electrode provided around the axis, A planar sensor for detecting the position of the first electrode and the position of the second electrode, and a control unit, wherein the control unit, when the indicator is tilted toward the first direction on the sensor from an orthogonal direction orthogonal to the sensor A first lookup table in which a correspondence relationship between a first input value corresponding to a value calculated based on the position of each of the first and second electrodes and a first correction value, which is a correction value of an inclination of the axis, is registered, and an indicator on the sensor. Correspondence of a second input value corresponding to a value calculated based on the position of each of the first and second electrodes when tilted toward a second direction different from the direction, and a second correction value that is a correction value of the tilt of the axis An input calculation unit that calculates an input value based on the position of each of the first and second electrodes, the second lookup table in which the system is registered, and inputs the first and second lookup tables as first and second input values; Based on the positions of the first and second electrodes, the rotation angle calculation unit derives the rotation angle of the axis from the first direction toward the second direction, and the axis from the orthogonal direction from the rotation angle and the first and second correction values And an inclination direction inclination correction value calculation unit for calculating a correction value of an inclination direction inclination which is an inclination of the axis toward the inclined direction.

In addition, the method for deriving a slope according to the present invention is a method for deriving a slope instructed by a pen-shaped indicator, and a first sensor installed on one end in the axial direction of the indicator is installed by a sensor on a plane to surround the shaft. The first when the position of each of the two electrodes is detected, the input value is calculated based on the position of each of the first and second electrodes, and the indicator is tilted from the orthogonal direction orthogonal to the sensor toward the first direction on the sensor And a first lookup table in which a correspondence relationship between a first input value corresponding to a value calculated based on the position of each of the second electrodes and a first correction value, which is a tilt correction value of the axis, is registered, and the input value is used as the first input value. A second input corresponding to a value calculated based on the position of each of the first and second electrodes when the indicator is tilted toward a second direction different from the first direction on the sensor The input value is input as the second input value to the second lookup table in which the correspondence relationship between the second correction value which is the tilt correction value of the axis and the axis is registered, and based on the positions of the first and second electrodes, from the first direction. Derivation of the rotation angle of the axis toward the second direction, from the rotation angle and the first and second correction values output from the first and second look-up tables, the inclination direction slope which is the inclination of the axis from the orthogonal direction toward the inclined direction Calculate the correction value.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

1 is an explanatory view of the inclination derivation device 1 in the embodiment of the present invention and the indicator 101 used therewith. 2 is an explanatory diagram of the slope derivation device 1.

The indicator 101 has a pen shape, a first electrode 101a installed at one end in the direction of the axis C, a second electrode 101b provided around the axis C, and a driving circuit not shown to drive them It is equipped with.

In the present embodiment, the second electrode 101b is provided in a ring shape so as to surround the shaft C.

The first and second electrodes 101a and 101b transmit a signal to the slope derivation device 1 by electrostatic coupling with the sensor 2 of the slope derivation device 1 described later.

The slope derivation device 1 is a tablet-type information terminal in the present embodiment. The tilt derivation device 1 is provided with a sensor 2 which is a planar and capacitive type on the surface of a display device such as a liquid crystal panel, for example, and covers the sensor 2 substantially across the entire display area of the liquid crystal panel. Is provided, and the entire display area is a position-detectable area 1a by a sensor. The sensor 2 of the tilt derivation device 1 detects the position of the first electrode 101a and the position of the second electrode 101b when the indicator 101 is located in the position-detectable area 1a , The position indicated by the indicator 101 is detected.

The sensor 2 includes a plurality of first-direction conductors 3 extending in the first direction, and a plurality of second-direction conductors 4 extending in the second direction orthogonal to the first direction. In the present embodiment, the first direction is a direction X that is transverse to the ground, and the second direction is a direction Y that is longitudinal to the ground.

Each of the first direction conductor 3 and the second direction conductor 4 is such that one of the conductors 3 and 4 has a predetermined width corresponding to a predetermined number of pixels of the display device in the position-detectable area 1a. It is formed, and is provided so as to have a lattice shape that is coarser than that of the display device. In each of the portions where the first direction conductor 3 and the second direction conductor 4 intersect, conductors 3 and 4 overlap each other to form one unit 2b of the sensor 2 shown in FIG. 5. It is done.

The slope derivation device 1 is provided with a selection circuit 5. The ends of each of the first and second direction conductors 3 and 4 are connected to the selection circuit 5. The selection circuit 5 selects each of the first and second directional conductors 3 and 4 in a predetermined order, so that each conductor 3, from the first and second electrodes 101a and 101b of the indicator 101, is selected. The signal transmitted in 4) is received.

The selection circuit 5 transmits the signals received from the conductors 3 and 4 to the input data generation section 6 described below.

The slope derivation device 1 includes an input data generation unit 6. The input data generation unit 6 classifies the signal received from the selection circuit 5 into signals received from the first electrode 101a of the indicator 101 and signals received from the second electrode 101b. , Respectively, as first electrode data and second electrode data, to the control unit 10 described below.

This classification is performed, for example, by the sensor 2 and the selection circuit 5 performing time division of signal reception from the first electrode 101a and signal reception from the second electrode 101b.

The slope derivation device 1 is provided with a control unit 10. 3 is a signal processing block diagram of the control unit 10. The control unit 10 includes a center calculation unit 11, an IIR filter 12, an electrode position difference calculation unit 13, an input calculation unit 14, a lookup table (hereinafter referred to as LUT, 15), and a rotation angle calculation unit (16), an inclination direction tilt correction value calculation unit 17, and first and second direction inclination calculation units 18 are provided.

The center calculation unit 11 includes a first center calculation unit 11A and a second center calculation unit 11B.

The 1st center calculation part 11A receives the 1st electrode data transmitted from the input data generation part 6, and calculates the maximum value in each of the direction X and the direction Y. Thereby, the 1st center calculation part 11A calculates the coordinates on the sensor 2 in which the signal transmitted from the 1st electrode 101a of the indicator 101 is strongest, ie, the reaction of the 1st electrode 101a is strongest. To be specific.

Moreover, the first center calculation unit 11A has five first and second direction conductors 3 and 4 in each of the vertical and horizontal directions, centered on the coordinates on the sensor 2 having the strongest response of the first electrode 101a. Corresponding to), data of coordinates on a total of 25 sensors 2 is extracted. 4 illustrates 25 data D1 to D25 thus extracted. In Fig. 4, the data corresponding to the coordinates on the sensor 2 having the strongest response from the first electrode 101a is D13 located at the center.

For the 25 pieces of data, the first center calculation unit 11A calculates the integration of the data values D _i and the coordinate values (x _i , y _i ) on the sensor 2 as shown in Equation 1 below. And divide it by the sum of D _i . Accordingly, the first electrode tentative coordinate values A _t (A _xt , A _yt ), which are the coordinate values on the sensor 2 in each of the directions X and Y, where the reaction of the first electrode 101a is strongest, are at a particle size of less than a decimal point. Is calculated.

Equation 1

The first center calculation unit 11A transmits the first electrode tentative coordinate value A _t to the IIR filter 12.

The second center calculation unit 11B receives the second electrode data and calculates a maximum value in each of the directions X and Y in the same manner as the first center calculation unit 11A. As a result, the second center calculator 11B calculates the coordinates on the sensor 2 in which the signal transmitted from the second electrode 101b of the indicator 101 is strongest, that is, the response of the second electrode 101b is strongest. To be specific.

Moreover, the second center calculation unit 11B has five in each of the vertical and horizontal directions, centered on the coordinates on the sensor 2 having the strongest response of the second electrode 101b, similarly to the first center calculation unit 11A. Data of coordinates on a total of 25 sensors 2 corresponding to the first and second direction conductors 3 and 4 is extracted.

For the 25 pieces of data, the second center calculation unit 11B, like the first center calculation unit 11A, has a data value (D _i ) and a coordinate value (x _i , y _i ) on the sensor 2. Perform the integration of and divide this by the sum of D _i . Thus, the second electrode tentative coordinate values B _t (B _xt , B _yt ), which are the coordinate values on the sensor 2 in each of the directions X and Y where the reaction of the second electrode 101b is strongest are calculated.

The second center calculation unit 11B transmits the second electrode tentative coordinate value B _t to the IIR filter 12.

The IIR filter 12 includes a first IIR filter 12A and a second IIR filter 12B.

The first IIR filter 12A receives the first electrode tentative coordinate value A _t from the first center calculator 11A, applies temporal IIR filters to reduce temporal shaking, and the first electrode coordinate value. Calculate A (A _x , A _y ).

The first IIR filter 12A transmits the first electrode coordinate value A to the electrode position difference calculator 13.

The second IIR filter 12B receives the second electrode tentative coordinate value B _t from the second center calculator 11B, applies temporal IIR filters to reduce temporal shaking, and the second electrode coordinate value. Calculate B (B _x , B _y ).

The second IIR filter 12B transmits the second electrode coordinate value B to the electrode position difference calculation unit 13.

The electrode position difference calculation unit 13 receives the first electrode coordinate value A and the second electrode coordinate value B from the first IIR filter 12A and the second IIR filter 12B.

The electrode position difference calculation unit 13 calculates B _x -A _x and B _y -A _y to obtain a difference between the coordinate values A and B, and is used in the internal processing of the display device, direction X and direction Y respectively The first direction difference S _x and the second direction difference S _y are calculated by converting to the internal resolution value of.

Equation 2

In Equation 2, P _x and P _y are values obtained by dividing each of the internal resolution values in the direction X and the direction Y of the display device by the number of the second direction conductor 4 and the first direction conductor 3, respectively. to be.

The electrode position difference calculation unit 13 transmits the first direction difference S _x and the second direction difference S _y to the input calculation unit 14 and the rotation angle calculation unit 16.

The input calculation unit 14 is based on the positions A and B of each of the first and second electrodes, and more specifically, the first direction calculated by the electrode position difference calculation unit 13 based on the positions A and B. Based on the difference S _x and the difference S _y in the second direction, an input value is calculated and input to the LUT 15.

5 shows the relationship between the first electrode 101a and the second electrode 101b of the indicator 101 and the slope derivation device 1 as a coordinate system. The XY plane in FIG. 5 corresponds to the position detecting area 1a of the tilt derivation device 1.

The input calculation unit 14, more specifically, the distance (D) on the sensor, which is the distance of each position of the first and second electrodes 101a and 101b on the sensor 2, is the axis C The input value is calculated by dividing by the axial distance L, which is the distance between the first electrode 101a and the second electrode 101b in the direction.

Hereinafter, the direction in which the axis C is inclined from the orthogonal direction Z orthogonal to the sensor 2 is called an inclined direction. In FIG. 5, the inclination Θ of the axis C toward the inclination direction is illustrated as the inclination direction inclination Θ.

In this embodiment, after calculating the gradient θ in the inclined direction, the first direction gradient Θ _x and the second direction gradient Θ _y to be described later are derived using the gradient.

Basically, as shown in Equation 3 below, the distance D on the sensor is calculated, and it is possible to calculate the slope Θ _t in the inclined direction.

Equation 3

10 is an explanatory diagram showing the relationship between the input calculation unit 44 and the LUT 45 of the control unit in a modification of the present embodiment described later. The input calculation unit 44 in this modified example calculates the inclination direction gradient Θ _t based on Equation 3 above.

As will be described later, an error is implied in the slope Θ _t calculated by Equation 3, and when using this value, additional correction is necessary to resolve the error. The LUT 45 shown in FIG. 10 performs this correction, and the LUT 45 stores a corresponding relationship between the inclination direction θ _t and its correction value. As a result, the LUT 45 outputs a correction value of the slope Θ corresponding to the input slope gradient Θ _t . That is, the inclination direction gradient Θ _t calculated by Equation 3 is a provisional value only.

As described in more detail later, the LUTs 15 and 45 shown in FIGS. 3 and 10, with respect to the values calculated by the input calculators 14 and 44, correct the slope gradient values. Output. Therefore, as shown in FIG. 10, the input calculation unit 44 is mounted to input the tentative value Θ _t calculated by Equation 3 as an input, and output a correction value of the gradient in the gradient direction, and the LUT ( It is also possible to construct 45).

However, in the present embodiment, as shown in FIG. 3, the input calculation unit 14 calculates the input value I for the LUT 15 as D / L using the following Equation 4. That is, instead of the tentative value Θ _t of the gradient in the gradient direction calculated by Equation 3, the input value I is a value calculated based on the positions A and B of each of the first and second electrodes 101a and 101b. Calculate and input it to LUT (15). In response to this, the LUT 15 registers a correspondence relationship between a value corresponding to the input value I and a slope correction value, not a slope.

Equation 4

In Equation 3, a trigonometric function that requires a complicated calculation or special conversion table in memory is used. As described above, by setting the input to the LUT 15 as the value of I = D / L, and registering the corresponding relationship including the calculation of the trigonometric function of the input value and the corrected value to the LUT 15, the trigonometric function The calculation and implementation of the conversion table for the memory are omitted.

The input calculation unit 14 transmits and inputs the calculated input value I to the LUT 15.

The LUT 15 includes a first LUT 15A and a second LUT 15B.

In each of the first and second LUTs 15A and 15B, when the indicator 101 is tilted from the orthogonal direction Z orthogonal to the sensor 2 toward the first and second directions X and Y, respectively, Each of the first and second input values corresponding to a value calculated based on the positions A and B of each of the second electrodes 101a and 101b, and the first and second correction values, respectively, which are tilt correction values of the axis C The correspondence of is registered.

In the indicator 101, when the first electrode 101a is installed so as to contact the sensor 2, the second electrode 101b is located away from the sensor 2, as shown in FIG. The electrode 101b has a small detection value by the sensor 2. In addition, since the second electrode 101b is formed around the axis C in a larger volume compared to the first electrode 101a, the range in which the sensor 2 detects as the second electrode 101b is large. As described above, since the sensor 2 detects the area where the small detection value is widely distributed as the position of the second electrode 101b, it is not easy to accurately specify the detection coordinate B of the second electrode 101b. Therefore, the 2nd electrode coordinate value B output from the 2nd IIR filter 12B is supposed to contain the error much.

Therefore, in the case where the gradient in the gradient direction is derived by Equation 3 as described above, the error is reflected in the tentative value Θ _t of the derived gradient in the gradient direction.

Similarly, in the case of using Equation 4 as described above, the error is reflected in the input value I.

Here, if the relationship between the angle at which the indicator 101 is actually tilted and the calculated value including the error of the second electrode coordinate value B and the slope of the inclined direction Θ is known in advance, from the calculated value including these errors, the indicator A high-precision slope of (101) will be derived. That is, for example, by an experiment or the like, by the inclination derivation device set to output the input value I by the input calculation unit 14, the indicator 101 is actually in the first and second directions X and Y, respectively. The angle is measured by tilting toward and the output value including the error of the input value I at that time is obtained. With respect to this output value, the inclination of the actual indicator 101 is correlated as the corrected values of the inclinations θ ₁ and θ ₂ , and is stored as a correspondence relationship, that is, stored. When actually measuring the slope, the input calculation unit 14 calculates the input value I including the error as a value corresponding to the tentative value Θ _t of the slope in the gradient direction. Then, based on the input value I, correction values θ ₁ and Θ ₂ of corresponding slopes in the corresponding relationship in the first and second directions X and Y are respectively derived. Thus, the high-precision slope of the indicator 101 can be obtained. This correspondence is registered in the LUT 15.

More specifically, in the first LUT 15A, positions A and B of the first and second electrodes 101a and 101b, respectively, when the indicator 101 is tilted from the orthogonal direction Z to the first direction X A correspondence relationship between a first input value corresponding to the calculated value based on and a first correction value Θ ₁ which is a slope correction value of the axis C is registered. Here, the value calculated based on the positions A and B of each of the first and second electrodes 101a and 101b refers to Equation 4 when the indicator 101 is tilted from the orthogonal direction Z toward the first direction X. It is the value of I = D / L including the error calculated by.

In other words, the first correction value Θ ₁ tilts the indicator 101 by an angle actually inclined toward the first direction X in place of the inclined direction that is actually inclined, and is output when I under this condition is the first input value. It is a correction value of the gradient in the first direction X to be performed.

Further, the second LUT 15B corresponds to a value calculated based on the positions A and B of each of the first and second electrodes 101a and 101b when the indicator 101 is tilted toward the second direction Y A correspondence relationship between the second input value to be calculated and the second correction value Θ ₂ which is a tilt correction value of the axis C is registered. Here, the value calculated based on the positions A and B of each of the first and second electrodes 101a and 101b refers to Equation 4 when the indicator 101 is tilted from the orthogonal direction Z to the second direction Y. It is the value of I = D / L including the error calculated by.

In other words, the second correction value Θ ₂ is output when the indicator 101 is tilted by the angle actually inclined toward the second direction Y in place of the inclined direction actually inclined, and I is the second input value under this situation. It is a tilt correction value in the second direction Y to be performed.

That is, the first LUT 15A and the second LUT 15B are respectively indicators when the input value I received from the input calculation unit 14 is input as corresponding first and second input values. Correction value of the inclination in the first and second directions X and Y, respectively, when 101 is assumed to be inclined toward the first and second directions X and Y, not actually in the inclined direction ( Θ ₁ , Θ ₂ ) is output. The inclination direction tilt correction value calculation unit 17 described later is appropriately divided based on the rotation angle of the axis C from the first direction X to the second direction Y with respect to these output values Θ ₁ and Θ ₂ . By processing, the correction value Θ _C of the final inclination direction is calculated.

As described above, the corrected inclination direction gradients Θ ₁ and Θ ₂ in each of the first direction X and the second direction Y are output, and based on this, a correction value θ _C of the final inclination direction gradient is calculated. . Thereby, even if the length and sensitivity of one unit 2b of the sensor 2 shown in FIG. 5 are different in the first direction X and the second direction Y, the influence is reduced.

6 and 7 show embodiments of the first LUT 15A and the second LUT 15B. In these tables, the first and second input values are shown as 'addresses' in odd columns from the left. In addition, on the right side, that is, in the even-numbered column, the first and second correction values Θ ₁ and Θ _{2 of} each slope direction Θ are shown as 'data'.

In this embodiment, each of the first and second input values and the first and second correction values Θ ₁ and Θ ₂ is multiplied by a predetermined value, such as 100. This is for suppressing reduction in arithmetic precision when performing round processing on integers. In addition, the units of the first and second correction values Θ ₁ and Θ ₂ in this embodiment are radians.

For example, in FIG. 6, the value '51' is shown as 'data' at a position where 'address' is '50'. This means that when the first input value is 0.5, that is, when the inclination in the inclined direction corresponds to 30 °, the first correction value Θ ₁ is 0.51 rad, that is, about 29.2 °. This means that in the case of an experiment, when the input value I calculated by the input calculator 14 shows a value corresponding to a 30 ° inclination direction, the inclination direction inclination toward the first direction X is 29.2 ° This indicates that the indicator 101 was tilted as much as possible.

In the present embodiment, the first and second input values are realized with, for example, 7 bits, and have values up to 127.

As shown in Fig. 1, in the present embodiment, the indicator 101 is formed in a tapered shape gradually increasing in diameter toward the axis C from the tip end where the first electrode 101a is located. Assuming that the angle α with respect to the axis C of the tapered portion is, for example, 25 °, the first electrode 101a is brought into contact with the position-detectable area 1a of the tilt derivation device 1. In the state, it is impossible to tilt the indicator 101 beyond 25 °. Therefore, the upper limit of the first and second correction values Θ ₁ and Θ ₂ is 1.13 rad, which corresponds to 65 ° in this case. That is, in the present embodiment, the value exceeding the upper limit of 1.13 rad is not registered in the LUT 15.

In addition, in the present embodiment, the measurement experiment on the sensor 2 as described above is performed at any of a plurality of locations on the position-detectable area 1a, for example, five locations. More specifically, these five locations are, for example, the center of the position-detectable area 1a, and each of the four corners. Then, by calculating the average of the values measured by these places, values to be registered in the first and second LUTs 15A and 15B are determined. Thereby, the influence of errors due to differences in values depending on the location on the position-detectable area 1a is reduced.

The LUT 15 is based on a corresponding relationship as shown in FIGS. 6 and 7, based on an input value I received from the input calculator 14, the first and the first slopes of the gradient Θ. 2 The correction values Θ ₁ and Θ ₂ are extracted and transmitted to the gradient correction value calculator 17.

The rotation angle calculation unit 16 is the first calculated by the electrode position difference calculation unit 13 based on the positions A and B of each of the first and second electrodes, and more specifically based on the positions A and B. Based on the direction difference S _x and the second direction difference S _y , a rotation angle Φ of the axis C from the first direction X toward the second direction Y is derived.

The rotation angle corresponds to the XY plane from the first direction X shown in FIG. 5, that is, the angle Φ toward the second direction Y on the position-detectable area 1a.

The rotation angle calculation unit 16 derives the rotation angle Φ from Equation 5 shown below.

Equation 5

The rotation angle calculation unit 16 transmits the derived rotation angle Φ to the inclination direction gradient correction value calculation unit 17 and outputs it to the outside.

The inclination direction inclination correction value calculation unit 17 receives the first and second correction values Θ ₁ and Θ ₂ from the first and second LUTs 15A and 15B, and the rotation angle from the rotation angle calculation unit 16. (Φ) are respectively received.

The inclination direction gradient correction value calculation unit 17, from the rotation angle Φ and the first and second correction values Θ ₁ and Θ ₂ , the first correction value Θ ₁ according to the value of the rotation angle Φ ) And the second correction value Θ ₂ , the correction value θ _c of the inclination in the gradient direction is calculated.

More specifically, the inclination direction slope correction value calculation unit 17 calculates the conversion value M by converting the rotation angle Φ into an angle between the first direction X and the second direction Y according to Equation 6 below. , Based on this, the stimulation process is performed.

Equation 6

here,

As can be seen from Equation 6, M is a rotation angle Φ converted to an angle between the first direction X and the second direction Y, that is, a value of 0 or more and π / 2 or less, and N is π / 2 and M It is a difference. In the above formula, M is multiplied by the second correction value Θ ₂ , and N is multiplied by the first correction value Θ ₁ . Accordingly, when the conversion value M is large and closer to the second direction Y than the first direction X, the second correction value Θ ₂ corresponding to the second direction Y is greater than the first correction value Θ ₁ . Θ _c ). In addition, when the conversion value M is small and close to the first direction X, on the contrary, N becomes large, and the first correction value Θ ₁ corresponding to the first direction X greatly affects the correction value Θ _c . .

The gradient direction gradient correction value calculation unit 17 transmits the calculated correction value of the gradient direction gradient Θ _c to the first and second direction gradient calculation units 18 described below.

The first and second direction inclination calculation units 18 incline the first direction difference S _x and the second direction difference S _y from the electrode position difference calculation unit 13 from the inclination direction inclination correction value calculation unit 17 The correction values θ _c of the direction gradients are respectively received.

The first and second direction inclination calculator 18 is based on the correction value Θ _c of the inclination direction inclination, and the first direction inclination which is the inclination of the axis C from the orthogonal direction Z to the first direction X , From the orthogonal direction Z, the second direction inclination, which is the inclination of the axis C toward the second direction Y, is derived.

In the present embodiment as described above, since the first direction is the direction X shown in FIG. 5, the first direction gradient, which is the tilt of the axis C from the orthogonal direction Z toward the first direction X on the sensor 2, Corresponds to the angle Θ _{x in} the XZ plane in FIG. 5. The first direction inclination Θ _x is, in other words, the inclination of the axis C _x which is a component of the axis C projected from the orthogonal direction Z to the XZ plane.

Also, in this embodiment, the second direction is the direction Y shown in Fig. 5, so the second direction inclination, which is the inclination of the axis C from the orthogonal direction Z to the second direction Y on the sensor 2, is Corresponds to the angle Θ _{y in} the YZ plane at 5. The second direction slope Θ _y is, in other words, the slope of the axis C _y which is a component of the axis C projected from the orthogonal direction Z to the YZ plane.

The first and second direction inclination calculator 18 is based on Equation 7 shown below, from the correction value θ _c of the inclination direction inclination Θ, the second electrode from the position-detectable area 1a ( 101b) After calculating the height H, the first direction gradient Θ _x and the second direction gradient Θ _y are derived.

Equation 7

The first and second direction slope calculator 18 outputs the derived first direction slope Θ _x and the second direction slope Θ _y to the outside.

Next, a slope derivation method using the slope derivation device 1 will be described with reference to FIGS. 1 to 7 and 11.

When the indicator 101 is positioned on the tilt derivation device 1 such that the first electrode 101a contacts the position detection area 1a of the tilt derivation device 1, the tilt derivation device 1 is a sensor The positions of the first electrode 101a and the second electrode 101b are detected by (2).

More specifically, the selection circuit 5 receives the signal transmitted from the indicator 101 to the sensor 2 through each of the first direction conductor 3 and the second direction conductor 4.

The selection circuit 5 transmits the signals received from the conductors 3 and 4 to the input data generation section 6.

The input data generation unit 6 classifies the signal received from the selection circuit 5 into signals received from the first electrode 101a of the indicator 101 and signals received from the second electrode 101b. , Each of which is transmitted to the control unit 10 as first electrode data and second electrode data.

The 1st center calculation part 11A of the control part 10 receives the 1st electrode data transmitted by the input data generation part 6, and the signal transmitted from the 1st electrode 101a of the indicator 101 is disguised. Coordinates that are strong, that is, the reaction of the first electrode 101a are strongest, are specified. The first center calculation unit 11A calculates the first electrode tentative coordinate values A _t (A _xt , A _yt ) from the coordinates where the reaction of the first electrode 101a is strongest.

The first center calculation unit 11A transmits the first electrode tentative coordinate value A _t to the IIR filter 12.

The second center calculation unit 11B receives the second electrode data in the same way as the first center calculation unit 11A, calculates the second electrode tentative coordinate values B _t (B _xt , B _yt ), and calculates the IIR filter ( 12).

The first IIR filter 12A receives the first electrode tentative coordinate value A _t from the first center calculator 11A, and applies a time-directed IIR filter to apply the first electrode coordinate value A (A _x , A _y ) Is calculated and transmitted to the electrode position difference calculation unit 13.

The second IIR filter 12B receives the second electrode tentative coordinate value B _t from the second center calculator 11B, and applies a time-directed IIR filter to apply the second electrode coordinate value B (B _x , B _y ) Is calculated and transmitted to the electrode position difference calculation unit 13.

The electrode position difference calculation unit 13 receives the first electrode coordinate value A and the second electrode coordinate value B from the first IIR filter 12A and the second IIR filter 12B.

The electrode position difference calculation unit 13 calculates the first direction difference S _x and the second direction difference S _y and transmits them to the input calculation unit 14 and the rotation angle calculation unit 16.

The input calculation unit 14 calculates the input value I by Equation 4 based on the first direction difference S _x and the second direction difference S _y calculated by the electrode position difference calculation unit 13. .

The input calculation unit 14 inputs the calculated input values I as first and second input values to the first and second LUTs 15A and 15B, respectively.

The first LUT 15A and the second LUT 15B of the LUT 15 receive the input value I received from the input calculator 14 according to the corresponding relationship as shown in FIGS. 6 and 7. Based on this, the first and second correction values Θ ₁ and Θ ₂ are extracted and transmitted to the gradient correction value calculation unit 17.

The rotation angle calculation unit 16 is based on the first direction difference S _x and the second direction difference S _y calculated by the electrode position difference calculation unit 13, and the axis from the first direction X to the second direction Y The rotation angle Φ of (C) is derived.

The rotation angle calculation unit 16 transmits the derived rotation angle Φ to the inclination direction gradient correction value calculation unit 17 and outputs it to the outside.

The inclination direction inclination correction value calculation unit 17 receives the first and second correction values Θ ₁ and Θ ₂ from the first and second LUTs 15A and 15B, and the rotation angle from the rotation angle calculation unit 16. (Φ) are respectively received.

The inclination direction gradient correction value calculation unit 17, from the rotation angle Φ and the first and second correction values Θ ₁ and Θ ₂ , the first correction value Θ ₁ according to the value of the rotation angle Φ ) And the second correction value Θ ₂ , the correction value θ _c of the inclination in the gradient direction is calculated.

More specifically, the inclination direction slope correction value calculation unit 17 converts the rotation angle Φ to an angle between the first direction X and the second direction Y according to Equation 6, calculates the converted value M, and Based on this, an eye treatment is performed.

The gradient direction gradient correction value calculation unit 17 transmits the calculated correction value θ _c of the gradient direction gradient to the first and second gradient calculation units 18.

The first and second direction inclination calculation units 18 incline the first direction difference S _x and the second direction difference S _y from the electrode position difference calculation unit 13 from the inclination direction inclination correction value calculation unit 17 Each of the correction values θ _c of the direction gradient is received.

The first and second direction inclination calculator 18 derives the first direction inclination Θ _x and the second direction inclination Θ _y based on the correction value of the inclination direction inclination Θ _c , and goes to the outside. Output.

Next, effects of the slope derivation device 1 and the slope derivation method will be described.

According to the configuration as described above, the LUT 15 corresponds to the tentative value Θ _t of the slope Θ, which includes the error, calculated by the input calculator 14 and the correction value Θ _c Relationship is registered.

More specifically, in the present embodiment, the LUT 15 is actually an indicator (indicated by an inclination derivation device set to externally output an input value I by the input calculator 14, for example, by experiment or the like). 101) The angle is measured by inclining toward each of the first and second directions X and Y, and the output value including the error of the input value I at that time is obtained, and the slope of the actual indicator 101 with respect to this output value Corresponding relations are stored in which the values corresponding to are corrected values (θ ₁ and θ ₂ ) of the slope. That is, the corresponding relationship of the LUT 15 is a correction value (Θ ₁ , respectively) in the first and second directions X and Y, respectively, of the value of the slope in which the indicator 101 is actually tilted and the output value of the input calculator 14. It is generated by matching Θ ₂ ) as an input value.

Therefore, due to factors such as a weak detection value due to the second electrode 101b being away from the sensor and a wide detection range due to the shape of the second electrode 101b, output from the second IIR filter 12B Even if the second electrode coordinate value B and the input value I calculated based on the second electrode coordinate value B in the input calculation unit 14 include a large amount of error, correction that has been resolved in response to this error The values Θ ₁ and Θ ₂ are stored in the first and second LUTs 15A and 15B, and in the gradient direction gradient correction value calculation unit 17, the gradient values from the correction values Θ ₁ and Θ ₂ Calculate the correction value of the slope (Θ _c ). For this reason, it is possible to increase the precision of the slope in the inclined direction to be calculated, and to accurately derive the slope of the indicator 101.

In addition, the first and second LUTs 15A and 15B have first and second tilt correction values of the axis C when the indicator 101 is tilted toward each of the first and second directions X and Y that are different from each other. The second correction values Θ ₁ and Θ ₂ are stored. Moreover, the inclined direction gradient correction value calculation unit 17 is the second direction Y from these first and second correction values Θ ₁ and Θ ₂ and the first direction X calculated by the rotation angle calculation unit 16. Based on the rotation angle Φ of the axis C toward, the correction value θ _c of the gradient in the oblique direction is calculated. That is, in which direction the axis C is inclined between the first direction X and the second direction Y is calculated, and the correction value Θ ₁ when inclined in the first direction X and in the second direction Y The correction value Θ _c of the gradient in the gradient direction is calculated by the separation process of the correction value Θ ₂ of.

Accordingly, when calculating the correction value θ _c of the gradient in the gradient direction, each of the first correction value Θ ₁ and the second correction value Θ ₂ may be appropriately reflected. Therefore, even if the length and sensitivity of one unit 2b of the sensor 2 are different in the first direction X and the second direction Y, the accuracy of the inclination direction calculated is increased, and the inclination of the indicator 101 is precisely Can be derived.

In addition, the inclination direction tilt correction value calculation unit 17 converts the rotation angle Φ to an angle between the first direction X and the second direction Y to calculate the conversion value M, and processes the separation based on the conversion value M To perform.

As a result, since the rotation angle Φ is converted to an angle between the first direction X and the second direction Y, particularly in the sizing process, the sizing process can be appropriately performed. Therefore, even if the length and sensitivity of one unit 2b of the sensor 2 are different in the first direction X and the second direction Y, the accuracy of the inclination direction calculated is increased, and the inclination of the indicator 101 is precisely Can be derived.

In addition, the input calculation unit 14 sets the distance D on the sensor which is the distance of each of the first and second electrodes 101a and 101b on the sensor 2 in the axis C direction. The input value I is calculated by dividing by the axial distance L, which is the distance between the first electrode 101a and the second electrode 101b.

According to the above-described configuration, since a complicated operation such as a trigonometric function is not required when calculating the input to the LUT 15, the calculation amount and the memory amount can be reduced.

Further, in the present embodiment, the first and second LUTs 15A and 15B can be realized as a one-dimensional arrangement, as shown in Figs. 6 and 7. Therefore, a small amount of memory required for mounting the first and second LUTs 15A and 15B is sufficient, and it is easily applicable to hardware having a low memory capacity.

<Experiment results>

Next, with reference to FIG. 8, the experimental results according to the above embodiment will be described.

Fig. 8 is a graph showing results of inclination inclination in the inclination derivation device 1 in which the length and sensitivity of one unit 2b of the sensor 2 are different in the first direction X and the second direction Y. It is shown. 8 (a), (b), (c), and (d) respectively, the rotation angles Φ are 0 °, 30 °, 60 °, and 90 °, respectively, and the inclination in the oblique direction is measured. The horizontal axis of each drawing in FIG. 8 is actually an angle at which the indicator 101 is tilted with respect to the position detecting area 1a of the tilt derivation device 1, and the vertical axis is the gradient in the oblique direction in the gradient derivation device 1 Is the value of

In each drawing of FIG. 8, the line 20 is an outlier, and the lines 21A, 22A, 23A, and 24A are slopes in the oblique direction derived by the calculation of Equation 3, and the lines 21B, 22B, 23B, and 24B ) Is the output value of the slope derivation device 1.

The lines 22A, 23A, and 24A are separated from the line 20 as the rotation angle Φ is 30 °, 60 °, 90 °, and the distance from 0 ° is farther, and the rotation angle Φ is particularly 90 ° In the case of, a large error is confirmed by greatly affecting the anisotropy of the length of one unit 2b of the sensor 2.

In comparison, the lines 22B, 23B, and 24B resulted in generally following the line 20, and the length and sensitivity of one unit 2b of the sensor 2 were different in the first direction X and the second direction Y. Even in the case, the error was reduced compared to the lines 22A, 23A, and 24A. That is, it can be seen that the eyebrow processing using Equation (6) in the gradient correction value calculator 17 in the inclined direction works effectively.

<Modification of the above embodiment>

Next, a modified example of the slope derivation device 1 and the slope derivation method shown as the above-described embodiments will be described. 9 is a signal processing block diagram of the control unit 30 of the slope derivation device in this modification. The control unit 30 in the gradient derivation device of this modification is compared with the control unit 10 of the gradient derivation device 1 in the above embodiment, so that the control unit 30 has a first direction gradient Θ _x and The point of outputting the gradient θ in the gradient direction is different by substituting the second direction gradient Θ _y .

That is, in this modified example, the inclination direction gradient correction value calculation unit 37 outputs the calculated correction value of the inclination direction gradient Θ _c as an inclination direction gradient Θ to the outside. In addition, the control unit 30 does not include first and second tilt calculation units.

Needless to say, the inclination derivation device and the inclination derivation method in this modification have the same effects as those in the above embodiment.

In addition, the slope derivation apparatus and the slope derivation method of the present invention are not limited to the above-described embodiment and each modified example described with reference to the drawings, and various other modified examples can be considered in the technical scope.

For example, in the above-described embodiments and modifications, the inclination derivation device was a tablet-type information terminal, but is not limited to this, and it goes without saying that other devices having a display device and a sensor such as a smartphone or a stationary display may be used.

In addition, although the liquid crystal panel was used as a display device in the said embodiment and each modified example, it is not limited to this, It goes without saying that other display devices, such as an organic EL display (OLED), may be used, for example.

In addition, in the above embodiment and modification, the second electrode 101b of the indicator 101 is provided in a ring shape to surround the axis C, but is not limited thereto. For example, a plurality of second electrodes having the same function may be formed in a ring shape as a result of being installed spaced apart from each other in the circumferential direction around the axis C, or may be arranged in different shapes.

Moreover, in the said embodiment, although the 1st direction X and the 2nd direction Y were mutually orthogonal, they may intersect at different angles of 90 degrees or more. Even in such a case, it is possible to cope with, for example, by adjusting the angle of ocular treatment in Equation (6).

In addition, in the above embodiment and modified example, the LUT 15 has registered a correspondence relationship between a value corresponding to the input value I and a correction value of the gradient in the inclined direction, represented by Equation (4). In place of this, the input calculation unit 44 outputs the tentative value Θ _t of the slope in the gradient direction, which is shown by Equation 3, as already described with reference to FIG. 10 in the above embodiment, and this tentative value Θ _t And, the LUT 45 may be configured such that a correspondence relationship between the correction values of the gradient in the gradient direction is registered.

Also in this case, the LUT 45 is provided with the 1st LUT 45A and the 2nd LUT 45B similarly to the said embodiment.

In the first LUT 45A, the first input value corresponding to the tentative value Θ _t calculated by Equation 3 when the indicator is tilted from the orthogonal direction Z to the first direction X, and the axis C A correspondence relationship between the first correction value θ _{1 which} is the slope correction value of is registered.

Further, in the second LUT 45B, the second input value corresponding to the tentative value Θ _t calculated by Equation 3 when the indicator is tilted toward the second direction Y, and the tilt correction of the axis C A correspondence relationship between the value of the second correction value Θ ₂ is registered.

In addition, it is also possible to elect to select the configurations exemplified in the above-described embodiments and modifications or to appropriately modify them to other configurations without departing from the spirit of the present invention.

For example, the control unit simultaneously includes both the first and second direction inclination calculation units 18 of the above embodiment and the inclination direction inclination correction value calculation unit 37 in the modified example, and the first direction inclination Θ _x , The second direction slope Θ _y and the slope direction slope Θ may all be output to the outside.

1: Inclination device
2: sensor
10, 30: control unit
14: input calculation section
15A: first LUT (first lookup table)
15B: first LUT (second lookup table)
16: Rotation angle calculation unit
17, 37: Inclination direction slope correction value calculation unit
18: first and second tilt calculation unit
101: indicator
101a: first electrode
101b: second electrode
A: position of the first electrode
B: position of the second electrode
C: axis
D: Distance on the sensor
I: Input value
L: axial distance
X: first direction
Y: 2nd direction
Z: Orthogonal direction
Θ: slope
Φ: rotation angle
Θ ₁ : 1st correction value
Θ ₂ : 2nd correction value
Θ _c : Correction value of slope
Θ _x : 1st slope
Θ _y : 2nd slope

Claims (16)

A tilt derivation device for deriving the inclination of a pen-shaped indicator,
The indicator includes a first electrode provided at one end in the axial direction and a second electrode provided around the axis,
It has a flat-panel sensor for detecting the position of the first electrode and the position of the second electrode, and a control unit,
The control unit,
A first input value corresponding to a value calculated based on the position of each of the first and second electrodes when the indicator is tilted from an orthogonal direction orthogonal to the sensor toward a first direction on the sensor, A first lookup table in which a corresponding relationship between first correction values, which are correction values of the tilt of the axis, is registered,
A second input value corresponding to a value calculated based on the position of each of the first and second electrodes when the indicator is tilted toward a second direction different from the first direction on the sensor, and A second lookup table in which a correspondence relationship between a second correction value which is a correction value of the tilt of the axis is registered,
An input calculator calculating an input value based on the position of each of the first and second electrodes, and inputting the first and second lookup tables as the first and second input values;
A rotation angle calculation unit deriving a rotation angle of the axis from the first direction toward the second direction based on the positions of each of the first and second electrodes,
And an inclination direction inclination correction value calculation unit for calculating a correction value of an inclination direction inclination of the axis from the orthogonal direction to the inclined direction from the rotation angle and the first and second correction values,
The input calculation unit may calculate a distance on the sensor that is a distance of each of the first and second electrodes on the sensor, and an axial direction that is a distance between the first electrode and the second electrode in the axial direction. Tilt derivation device for calculating the input value from D / L (D is the distance on the sensor, L is the axial distance) obtained by dividing by a distance.
According to claim 1,
The inclination direction tilt correction value calculation unit calculates the correction value of the inclination direction gradient by the division processing between the first correction value and the second correction value according to the value of the rotation angle. .
According to claim 2,
The inclination direction gradient correction value calculation unit converts the rotation angle into an angle between the first direction and the second direction, calculates a conversion value, and performs the segmentation process based on the conversion value (N × Calculate the correction value of the gradient in the inclination direction of θ1 + M × θ2) / (M + N) (M is the conversion value, N is the difference between π / 2 and M, θ1 is the first correction value , θ2 is the second correction value).
delete The method according to any one of claims 1 to 3,
Based on the correction value of the inclination direction inclination calculated by the inclination direction inclination correction value calculator, a first direction inclination that is an inclination of the axis from the orthogonal direction toward the first direction, and a second direction from the orthogonal direction A slope derivation device further comprising first and second direction slope calculation units for deriving a second direction slope which is a slope of the axis toward the direction.
The method according to any one of claims 1 to 3,
The inclination direction slope correction value calculating unit outputs the calculated correction value of the inclination direction gradient as the inclination direction gradient.
A slope derivation method for deriving a slope indicated by a pen-shaped indicator,
The position of each of the first electrode provided on one end in the axial direction of the indicator and the second electrode installed around the axis is detected by a planar sensor,
Based on the position of each of the first and second electrodes, the distance on the sensor that is the distance of the position of each of the first and second electrodes on the sensor is the first electrode in the axial direction. And D / L (D is the distance on the sensor, L is the axial distance) obtained by dividing by the axial distance which is the distance of the second electrode, and
A first input value corresponding to a value calculated based on the position of each of the first and second electrodes when the indicator is tilted from an orthogonal direction orthogonal to the sensor toward a first direction on the sensor, The input value is input as the first input value to a first lookup table in which a correspondence relationship between a first correction value which is a correction value of the tilt of the axis is registered,
A second input value corresponding to a value calculated based on the position of each of the first and second electrodes when the indicator is tilted toward a second direction different from the first direction on the sensor, and The input value is input as the second input value to a second lookup table in which a correspondence relationship between a second correction value which is a correction value of the tilt of the axis is registered,
Based on the position of each of the first and second electrodes, a rotation angle of the axis toward the second direction is derived from the first direction,
Calculating a correction value of an inclination direction gradient that is an inclination of the axis from the orthogonal direction to an inclined direction from the rotation angle and the first and second correction values output from the first and second lookup tables How to derive the slope.
The method of claim 7,
The correction value of the gradient in the gradient direction is calculated by a division process between the first correction value and the second correction value according to the value of the rotation angle.
The method of claim 8,
The rotation angle is converted to an angle between the first direction and the second direction to calculate a conversion value, and the separation process is performed based on the conversion value (N × θ1 + M × θ2) / (M Calculate the correction value of the inclination in the gradient direction of + N (M is the conversion value, N is the difference between π / 2 and M, θ1 is the first correction value, θ2 is the second correction value) How to derive the slope.
delete The method according to any one of claims 7 to 9,
Based on the correction value of the slope in the inclined direction, a first direction inclination that is the inclination of the axis from the orthogonal direction to the first direction, and a second direction inclination that is the inclination of the axis from the orthogonal direction to the second direction How to derive the slope.
The method according to any one of claims 7 to 9,
A gradient derivation method of outputting the calculated correction value of the gradient in the gradient direction as the gradient in the gradient direction. According to claim 1,
The rotation angle is derived by arctan (Sy / Sx), and Sx and Sy are inclination derivation devices, which are first and second direction differences calculated based on the positions of each of the first and second electrodes, respectively.
The method of claim 13,
The first and second direction differences are calculated by calculating a difference between the first and second electrode coordinate values and converting them into the internal resolution values of the first and second directions, respectively.
The method of claim 7,
The rotation angle is derived by arctan (Sy / Sx), and Sx and Sy are slope derivation methods which are first and second direction differences calculated based on the positions of each of the first and second electrodes, respectively.
The method of claim 15,
The difference between the first and second directions is calculated by calculating a difference between coordinate values of the first and second electrodes and converting them into internal resolution values of the first and second directions.

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