JP2015215802A - Coordinate input system, emission control method of electronic pen, information processing device and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To put received light intensity in a light receiving sensor within a prescribed range regardless of the inclination of an electronic pen when detecting a coordinate position of the electronic pen by detecting light from the electronic pen with light receiving sensors of a plurality of places around a coordinate input surface.SOLUTION: An electronic pen 13 is provided with three LEDs 14a, 14b, 14c having a different directivity of light emitting intensity in a flat plane including a pen shaft. Monochromatic light from each LED is converted into a light intensity signal showing light intensity of each color by a light receiving sensor 11. An LED selection part 34 generates an LED selection signal for instructing on/off of each LED on the basis of the light intensity signal, and transmits the LED selection signal to the electronic pen 13. In the electronic pen 13, a light emission mask part 21 turns on/off each LED on the basis of the LED selection signal. The LED selection signal turns on an LED whose light intensity is equal to or more than a prescribed value regardless of inclination of the electronic pen 13.

Description

  The present invention relates to a coordinate input system, an electronic pen light emission control method, an information processing apparatus, and a program.

  For example, a coordinate input device that inputs a coordinate position, which is position information on a coordinate input surface designated by a user with an indicator, such as a touch panel device, has become widespread. Based on the coordinate position input in this way, it is possible to control a computer connected to the coordinate input device, and to write characters and figures.

  As such a coordinate input device, there is a coordinate input device that detects light from an indicator that emits light on the coordinate input surface at two locations around the coordinate input surface and detects the coordinate position of the indicator by triangulation. Yes (Patent Document 1).

  This coordinate input device emits an electronic pen when the tip of the electronic pen as an indicator comes into contact with the board surface of the electronic blackboard as a coordinate input surface, and the light emission is arranged at two places around the electronic blackboard. Light received by a light receiving sensor (a linear image sensor having a number of light receiving elements arranged one-dimensionally or a television camera), and an electron for each light receiving sensor obtained from a light receiving intensity distribution (one-dimensional image or two-dimensional image) in each light receiving sensor From the direction of the pen and the distance between the light receiving sensors, the coordinate position where the electronic pen touches is detected by triangulation.

  In addition, when considering a system that supports a plurality of electronic pens, or for the purpose of obtaining higher coordinate detection accuracy, light receiving sensors are arranged at four locations around the electronic blackboard, and the outputs of the four light receiving sensors are used. Thus, it is considered to detect the coordinate position of the electronic pen.

  In such a coordinate input device, in order to accurately detect the coordinate position, it is necessary that the light receiving intensity of the light receiving sensor is within a predetermined range. This is because the direction of the electronic pen cannot be accurately detected if the received light intensity is outside the predetermined range, that is, too weak or too strong.

  However, in the above conventional coordinate input device, when an LED as a light emitting element is provided at the tip of the electronic pen, the direction of the light emitting characteristic of the LED (the region with high emission intensity is narrow) causes the electronic pen to tilt. In other words, the intensity of light reaching the light receiving sensor changes, and the light receiving intensity at the light receiving sensor does not fall within a predetermined range.

  The present invention has been made to solve such a problem, and an object of the present invention is to detect light from the electronic pen with a plurality of light receiving sensors around the coordinate input surface and determine the coordinate position of the electronic pen. When detecting, the received light intensity in the light receiving sensor is set within a predetermined range regardless of the inclination of the electronic pen.

  The coordinate input system according to the present invention is disposed at a plurality of locations around the coordinate input surface, an electronic pen having a plurality of light emitting units having different light emission directions with respect to the pen axis direction, and the electronic pen has A plurality of light receiving means for receiving light from a plurality of light emitting units; a coordinate position detecting means for detecting a coordinate position of the electronic pen relative to the coordinate input surface based on the light received by the plurality of light receiving means; Based on detection by the light emitting part detecting means, light emitting part detecting means for detecting a light emitting part that emits light whose received light intensity is within a predetermined range among the plurality of lights received by the plurality of light receiving means, A light-emitting unit control means for controlling the light-emitting state of the light-emitting unit.

  According to the present invention, when light from the electronic pen is detected by a plurality of light receiving sensors around the coordinate input surface and the coordinate position of the electronic pen is detected, the light receiving sensor The received light intensity can be set within a predetermined range.

It is a figure which shows the structure of the coordinate input system which concerns on embodiment of this invention. It is a figure for demonstrating LED provided in the electronic pen in FIG. It is a figure for demonstrating the directivity of the emitted light intensity of each LED provided in the electronic pen in FIG. It is a figure for demonstrating the directivity relationship of the emitted light intensity of three LED provided in the electronic pen in FIG. It is a figure for demonstrating the hardware constitutions of the computer in FIG. It is a figure for demonstrating the outline of operation | movement of the electronic pen and electronic board in FIG. It is a figure for demonstrating changing LED to light-emit according to the inclination of the electronic pen seen from the light receiving sensor in FIG. It is a figure for demonstrating the detail of operation | movement of the electronic pen and electronic board in FIG. It is a flowchart which shows the operation | movement by the side of the electronic board in FIG. It is a flowchart which shows the operation | movement by the side of the electronic pen in FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
<Configuration of coordinate input system>
FIG. 1 is a diagram showing a configuration of a coordinate input system according to an embodiment of the present invention.

  The coordinate input system 500 includes an electronic pen 13, an electronic board 200, a computer 100 as an information processing apparatus, and a PC (Personal Computer) 300 as an additional element. Here, the electronic pen 13 and the electronic board 200 constitute a coordinate input device. Further, as will be described in detail later, the electronic pen 13 includes a plurality of light emitting units having different light emitting directions with respect to the pen axis direction. The pen axis direction is the direction of the pen axis, that is, the direction of the central axis in the longitudinal direction of the pen.

  The electronic board 200 includes a panel surface 201 as a coordinate input surface and an image display surface, and light receiving sensors 11a to 11d as light receiving means. The light receiving sensors 11 a to 11 d are arranged outside the square of the board surface 201 as a plurality of locations around the board surface 201. However, this is an example of the arrangement form, and the number may be increased or decreased depending on the number of electronic pens 13 that are the detection targets of the position (coordinate position) in contact with the board surface 201.

  The light receiving sensor 11 is configured by combining a plurality of light receiving element groups arranged one-dimensionally or two-dimensionally and an imaging optical system, and the output is processed by the computer 100 to receive light intensity distribution (subject image) in the light receiving element group. ) Is used to obtain the coordinate position on the board surface 201 instructed by the electronic pen 13.

  A PC 300 is connected to the computer 100, and the computer 100 can display an image output from the PC 300 on a display device such as a liquid crystal display built in the board surface 201.

  An application corresponding to the coordinate input system is installed in the computer 100, and the application detects a coordinate position on the board surface 201 touched by the user with the electronic pen 13 based on a signal from the light receiving sensor 11. Then, the application analyzes the gesture based on the coordinate position and controls the computer 100. The application can display an operation menu on the surface 201 of the electronic board 200.

  The application can display an operation menu on the board 201. For example, when the user touches a menu for drawing a line and then draws a figure on the board surface 201 with the electronic pen 13, the computer 100 analyzes the coordinate position in contact with the electronic pen 13 in real time, Create coordinates.

  The computer 100 connects the time-series coordinates to create a line and displays it on the panel surface 201. In the figure, since the user moves the pointing tool along the shape of a triangle, the computer 100 records a series of coordinates as one stroke (triangle). Then, it is combined with an image (here, sun and mountain) displayed on the display device 301 of the PC 300 and displayed on the board surface 201.

  As described above, even if the electronic board 200 does not have a touch panel function, by using the application, the user can perform various operations only by touching the electronic board 200 with the electronic pen 13.

<Directivity of LED and light emission intensity provided on electronic pen>
FIG. 2 is a diagram for explaining the LEDs provided in the electronic pen 13.

  As shown in the figure, at the tip of the electronic pen 13, three LEDs 14 a, 14 b, and 14 c as light emitting units (one LED 14 when any one or more LEDs are shown) with respect to one light receiving sensor 11. Called). However, the number of LEDs provided for one light receiving sensor 11 may be increased in order to perform a more precise operation.

  Since the coordinate input system according to the present embodiment includes the four light receiving sensors 11a to 11d, the electronic pen 13 is provided with twelve LEDs. Although not shown in the drawing, the nine LEDs corresponding to the remaining three light receiving sensors are arranged in the circumferential direction of the outer peripheral surface of the tip of the electronic pen 13 as a set of three like the LEDs 14a, 14b, and 14c. Three sets are arranged at intervals of 90 °.

  In general, the light emission intensity in the light emission characteristics of an LED is not uniform in all directions, but becomes the strongest in a limited range in a certain direction. That is, the emission intensity has directivity. FIG. 3 is a diagram for explaining the directivity of the light emission intensity of the LED. In this figure, arrows 41 to 44 directed outward from the LED 14 represent monochromatic light emitted from the LED 14, and the thickness represents the emission intensity.

  As shown in the figure, the emission intensity of monochromatic light emitted from the LED 14 varies depending on the direction. Specifically, depending on the angle difference from the direction of the arrow 41 as the distance from the direction to the both sides (the direction of the arrow 46) is about the direction where the emission intensity is maximum (the direction of the arrow 41), the arrow As shown to 42-45, emitted light intensity becomes small.

  Therefore, if the position of the observation point (observation side viewpoint) is different, the received light intensity (the intensity of the light reaching) is also different according to the directivity of the emission intensity. Therefore, if the light reception intensity at the observation points 51 and 52 (the light emission intensity in the direction of the arrows 44 and 45) is known in advance, the observation points when the higher light reception intensity is observed (for example, the observation points 53 to 55). Thus, it can be determined that it is within the region between the observation point 51 and the observation point 52 (within the range indicated by the arrow 46).

  Based on the directivity of the light emission intensity of the LED, the electronic pen 13 according to this embodiment has the LEDs 14a, 14b, and 14c in such a manner that the light emission intensity of the LEDs 14a, 14b, and 14c is different from the pen axis direction. Arrange the tilt. Three sets of three LEDs not shown are also arranged in the same manner.

  FIG. 4 is a diagram for explaining the mutual relationship between the directivities of the light emission intensities of the LEDs 14a, 14b, and 14c. When monochromatic light of red (frequency: fa), blue (frequency: fb), and green (frequency: fc) is emitted from the LEDs 14a, 14b, and 14c, the directions in which the light emission intensity is maximum are arrows 41a and 41b, respectively. , 41c. Therefore, the relationship between the emission intensity and the observation point described with reference to FIG. 3 and the use of monochromatic light having a different color (frequency) indicate which of the regions A, B, and C is the observation point. Can be judged.

  As will be described later, the light receiving sensor 11 is used as an observation point, the light emission state of only the LED emitting light to the region where the observation point is located is turned on (lighted state), and light is emitted to the region where the observation point is not located. By turning off the light emitting state of the LED being turned off (light-off state), the light receiving sensor 11 can obtain an appropriate light receiving intensity not less than the light receiving intensity in the direction of the arrow 44 in FIG. , Power consumption can be reduced.

  When the observation point is located at the boundary between two adjacent regions, the two LEDs are turned on. In the case of FIG. 4, when the observation point is located at the boundary 47 between the region A and the region B, the LEDs 14a and 14b are turned on, and when the observation point is located at the boundary 48 between the region B and the region C, the LEDs 14b and 14c are turned on. turn on.

<Hardware configuration of computer>
FIG. 5 is a diagram for explaining the hardware configuration of the computer 100 in FIG. The computer 100 is a commercially available information processing apparatus or an information processing apparatus developed for a coordinate input system.

  The computer 100 includes a CPU (Central Processing Unit) 101, a ROM (Read Only Memory) 102, a RAM (Random Access Memory) 103, an SSD (Solid) connected electrically via a bus line 118 such as an address bus or a data bus. State Drive) 104, network controller 105, external storage controller 106, capture device 111, GPU (Graphics Processing Unit) 112, and sensor controller 114.

  The CPU 101 executes an application and controls the overall operation of the coordinate input system 500. The ROM 102 stores a program such as an IPL (Initial Program Loader) that is mainly executed by the CPU 101 at the time of startup. The RAM 103 serves as a work area when the CPU 101 executes an application. The SSD 104 is a nonvolatile memory that stores an application 119 for the coordinate detection system and various data. The network controller 105 performs processing based on a communication protocol when communicating with a server or the like via a network (not shown). The network is a LAN (Local Area Network) or a WAN (Wide Area Network such as the Internet) to which a plurality of LANs are connected.

  The external storage controller 106 performs writing to or reading from the removable external memory 117. The external memory 117 is, for example, a USB (Universal Serial Bus) memory, an SD (Secure Digital) card, or the like. The capture device 111 captures (captures) video displayed on the display device 301 by the PC 300. The GPU 112 is a processor dedicated to drawing that calculates the pixel value of each pixel of the electronic board 200. The display controller 113 outputs the image created by the GPU 112 to the electronic board 200.

  Four light receiving sensors 11a to 11d are connected to the sensor controller 114, and the light receiving output of the light receiving sensor 11 is sampled at a predetermined cycle (for example, 10 ms) to detect the light receiving direction. Then, the coordinate position of the electronic pen 13 is detected by triangulation based on the light receiving direction detected from the light receiving outputs of the two adjacent light receiving sensors. That is, the sensor controller 114 functions as coordinate position detection means.

  Further, the sensor controller 114 determines which of the regions A, B, and C in FIG. 4 the positions of the light receiving sensors 11a to 11d as the observation points in FIG. 3 are based on the received light intensity of each of the light receiving sensors 11a to 11d. Is detected.

  Here, when the light receiving sensor 11 is positioned in the region B, that is, when the light receiving intensity of blue light is within a predetermined range, the tilt of the electronic pen 13 is not more than a predetermined angle as viewed from the light receiving sensor 11 (arrow 41b). Is less than the angle to the direction of the boundaries 47 and 48). Further, when the light receiving sensor 11 is located in the region A, that is, when the light receiving intensity of blue light is within a predetermined range, the electronic pen 13 is viewed from the light receiving sensor 11 by a predetermined angle or more in the direction in which the upper end moves away. Tilted. Further, when the light receiving sensor 11 is located in the region C, that is, when the light receiving intensity of green light is within a predetermined range, the electronic pen 13 is more than a predetermined angle in the direction in which the upper end approaches the top as viewed from the light receiving sensor 11. Tilted.

  That is, the region to which the position of the light receiving sensor 11 belongs corresponds to the inclination of the electronic pen 13 viewed from the light receiving sensor 11. In addition, for example, the light receiving sensor 11a and the light receiving sensor 11d are positioned on the opposite sides of the electronic pen 13 on the board surface 201, so that the electronic pen 13 is predetermined in a direction in which the upper end thereof moves away from the light receiving sensor 11a. When tilted by more than an angle, when viewed from the light receiving sensor 11d, it is tilted by a predetermined angle or more in the direction in which the upper end approaches. That is, the inclination of the electronic pen 13 differs for each of the light receiving sensors 11a to 11d.

  Further, the sensor controller 114 corresponds to the light receiving sensor 11 based on the detection result of the position of the light receiving sensor 11 to which of the regions A, B, and C and the inclination of the electronic pen 13 viewed from the light receiving sensor 11. A signal (LED selection signal) indicating an LED to be turned on among the LEDs is generated. That is, for example, a signal instructing to turn on the LED 14a when the light receiving sensor 11 is located in the region A, the LED 14b when located in the region B, and the LED 14c when located in the region C is generated.

  The electronic pen controller 116 transmits the LED selection signal generated by the sensor controller 114 to the electronic pen 13. As a communication means between the electronic pen controller 116 and the electronic pen 13, it is possible to use radio waves, sound waves, light having a wavelength different from the light for detecting the coordinate position, or the like.

  The application 119 for the coordinate input system may be distributed in a state stored in the external memory 117, or may be downloaded from a server (not shown) via the network controller 105. The application 119 may be in a compressed state or an executable format.

<Outline of operation of electronic pen and electronic board>
FIG. 6 is a diagram for explaining an outline of operations of the electronic pen 13 and the electronic board 200.

  Optical signals are transmitted from the LEDs provided on the electronic pen 13 to the light receiving sensors 11a to 11d. In the electronic board 200, the optical signals from the electronic pen 13 are received by the light receiving sensors 11a to 11d.

  A sensor controller 114 in the computer 100 connected to the electronic board 200 detects the coordinate position of the electronic pen 13 by triangulation. The sensor controller 114 detects the inclination of the electronic pen 13 viewed from the light receiving sensors 11 a to 11 d based on the received light intensity and the frequency thereof, and transmits an LED selection signal as a detection result to the electronic pen 13. The electronic pen controller 116 transmits an LED selection signal to the electronic pen 13 as the detection result. The electronic pen 13 receives the LED selection signal and turns on / off the LED 14.

  FIG. 7 is a diagram for explaining changing the LED to emit light in accordance with the tilt of the electronic pen as viewed from the light receiving sensor 11. Here, FIG. 7A shows a case where it is determined that the light receiving sensor 11 is located in the region A in FIG. In this case, only the LED 14a is caused to emit light. FIG. 7B shows a case where it is determined that the light receiving sensor 11 is located in the region B in FIG. In this case, only the LED 14b is caused to emit light. FIG. 7C shows a case where it is determined that the light receiving sensor 11 is located in the region C in FIG. In this case, only the LED 14c is caused to emit light.

  As described above, an optimal LED is selected according to the inclination of the electronic pen 13 viewed from the light receiving sensor 11 to emit light, thereby efficiently transmitting an optical signal having an optimal light emission intensity from the electronic pen 13 to the light receiving sensor 11. can do.

  Although FIG. 6 shows the case where one electronic pen 13 is used, a plurality of electronic pens can be used simultaneously by changing the light emission frequency (light emission color) of the LED for each electronic pen.

<Details of operation of electronic pen and electronic board>
FIG. 8 is a diagram for explaining details of operations of the electronic pen 13 and the electronic board 200. Here, only one light receiving sensor is described among the light receiving sensors 11a to 11d, and only three LEDs corresponding to one light receiving sensor among the 12 LEDs of the electronic pen 13 are described.

  As shown in FIG. 8, the electronic pen 13 includes a light emitting mask unit 21. On the electronic board side, there are a light receiving sensor 11 and an LED selection unit 34 as a light emitting unit detection means. The LED selection unit 34 is a functional block realized by the function of the sensor controller 114.

  The light emission mask unit 21 determines which LED is to emit light based on the LED selection signal, and turns off the power of the LED that is not to emit light.

  The light receiving sensor 11 includes an optical filter unit 31, a voltage conversion unit 32, and an intensity measurement unit 33. The optical filter unit 31 filters monochromatic light and passes only monochromatic light having a desired frequency. Different filters are provided for each different monochromatic light. The voltage converter 32 converts the monochromatic light into an analog electric signal corresponding to the intensity. The intensity measurement unit 33 generates a light intensity signal as a digital value from the analog electrical signal and outputs the light intensity signal to the LED selection unit 34. The LED selection unit 34 detects the current inclination of the electronic pen 13 viewed from the light receiving sensor 11 from a light intensity signal indicating the intensity of three monochromatic lights, and transmits an LED selection signal as a detection result to the electronic pen 13. .

  FIG. 9 is a flowchart showing the operation on the electronic board side in FIG. 8, and FIG. 10 is a flowchart showing the operation on the electronic pen side in FIG. Hereinafter, it demonstrates in order.

  In the processing on the electronic board side shown in FIG. 9, first, the monochromatic light for each frequency (fa, fb, fc) is extracted by passing the light emitted from the electronic pen 13 through the optical filter unit 31, and the extracted monochromatic light On the other hand, voltage conversion is performed by the voltage converter 32, and the received light intensity is measured from each voltage value (step S1).

  From the light reception intensity measured in step S1, it is determined whether or not the light reception intensity of the monochromatic light emitted from each LED is equal to or higher than the minimum light reception intensity for fitting in the region A, B, or C in FIG. 4 (step S2). . This minimum received light intensity is grasped in advance as a known value on the electronic board side.

  Next, it is checked from the determination result of step S2 whether or not the received light intensity of monochromatic light emitted from two adjacent LEDs is within a predetermined range (step S3). That is, it is checked whether it is determined to be located at either the boundary 47 or the boundary 48.

  When it is determined that the received light intensity of monochromatic light emitted from two adjacent LEDs is within a predetermined range (step S3: YES), the received light intensity is determined to be within the predetermined range as an LED selection signal. A signal for instructing lighting of two adjacent LEDs is transmitted to the electronic pen 13 (step S4).

  When the received light intensity of monochromatic light emitted from two adjacent LEDs is not determined to be within the predetermined range (step S3: NO), only the received light intensity of monochromatic light emitted from one LED is within the predetermined range. It is checked whether or not it is determined to be within (step S5). That is, it is checked whether the area A, B, or C is determined to be located.

  When it is determined that only the received light intensity of the monochromatic light emitted from one LED is within the predetermined range (step S5: YES), the received light intensity is determined to be within the predetermined range as the LED selection signal. A signal instructing to turn on only one LED is transmitted to the electronic pen 13 (step S6).

  When it is not determined that only the emission intensity of monochromatic light emitted from one LED is within the predetermined range (step S5: NO), the process returns to step S1. This may be the case where no LED emits light, two non-adjacent LEDs are determined to be in the region, and three LEDs are determined to be in the region. Therefore, in these cases, the determination is performed again.

  In the processing on the electronic pen side shown in FIG. 10, the light emission mask unit 21 receives the LED selection signal transmitted from the electronic board side (step S11). The light emission mask unit 21 determines which LED should be turned on / off from the content of the LED selection signal, and turns on / off the LED (step S12). On the electronic pen side, the optical signal emitted from the LED 14 whose power is turned on is transmitted to the electronic board side (step S13).

  As described above in detail, according to the coordinate input system according to the embodiment of the present invention, light having a light receiving intensity within a predetermined range is transmitted to the light receiving sensor 11 regardless of the inclination of the electronic pen 13. can do.

  In the above embodiment, each LED is identified by changing the light emission color (frequency) of each LED. However, each LED can be identified by changing the light emission cycle or light emission timing of each LED. it can.

  DESCRIPTION OF SYMBOLS 11 ... Light reception sensor, 13 ... Electronic pen, 14 ... LED, 21 ... Light emission mask part, 34 ... LED selection part, 100 ... Computer, 200 ... Electronic board, 500 ... Coordinate input system.

Japanese Patent Laid-Open No. 11-3170

Claims (7)

An electronic pen having a plurality of light emitting portions with different light emitting directions with respect to the pen axis direction;
A coordinate input surface;
A plurality of light receiving means disposed at a plurality of locations around the coordinate input surface and receiving light from a plurality of light emitting units of the electronic pen;
Coordinate position detection means for detecting the coordinate position of the electronic pen relative to the coordinate input surface based on the light received by the plurality of light receiving means;
A light emitting unit detecting unit for detecting a light emitting unit that emits light having a light receiving intensity within a predetermined range in the plurality of lights received by the plurality of light receiving units;
Based on detection by the light emitting unit detecting means, light emitting unit control means for controlling the light emitting state of the plurality of light emitting units;
A coordinate input system. The coordinate input system according to claim 1,
The light emitting unit control means is a coordinate input system for turning on a light emitting unit detected by the light emitting unit detecting means. The coordinate input system according to claim 1,
The coordinate input system in which the plurality of light emitting units emit light having different frequencies. The coordinate input system according to claim 1,
The plurality of light emitting units is a coordinate input system provided for each light receiving sensor. An electronic pen having a plurality of light emitting units with different light emitting directions with respect to the pen axis direction, a coordinate input surface, and light received from the plurality of light emitting units of the electronic pen disposed at a plurality of locations around the coordinate input surface And a coordinate position detecting means for detecting a coordinate position of the electronic pen with respect to the coordinate input surface based on light received by the plurality of light receiving means. A light emission control method,
A light emitting part detecting step for detecting a light emitting part that emits light having a light receiving intensity within a predetermined range in the plurality of lights received by the plurality of light receiving means;
Based on the detection result of the light emitting unit detecting step, controlling the light emitting state of the plurality of light emitting units;
A method for controlling light emission of an electronic pen having An electronic pen having a plurality of light emitting units with different light emitting directions with respect to the pen axis direction, a coordinate input surface, and light received from the plurality of light emitting units of the electronic pen disposed at a plurality of locations around the coordinate input surface An information processing device connected to a coordinate input device having a plurality of light receiving means,
Coordinate position detection means for detecting the coordinate position of the electronic pen relative to the coordinate input surface based on the light received by the plurality of light receiving means;
A light emitting unit detecting unit for detecting a light emitting unit that emits light having a light receiving intensity within a predetermined range in the plurality of lights received by the plurality of light receiving units;
Means for transmitting information indicating the light emitting part detected by the light emitting part detecting means to the electronic pen;
An information processing apparatus. A program for causing a computer to function as each unit of the information processing apparatus according to claim 6.

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