JP5689017B2 - Touch panel device, display device, position detection method, computer program, and recording medium - Google Patents

Description

  The present invention provides a touch panel device that detects the position of a light-shielding object on the contacted surface based on a result of wide-area scanning that performs scanning over a wide range of the contacted surface and a result of narrow-area scanning that performs scanning within a narrow range; The present invention relates to a display device, a position detection method, a computer program, and a recording medium on which the computer program is recorded.

  In recent years, a so-called optical touch panel device that includes a plurality of light-emitting elements and a light-receiving element corresponding to the light-emitting element and detects the position of a light-shielding object on a contacted surface has become widespread.

  For example, in Patent Document 1, in the initial stage of position detection with respect to a light shielding object, all the light emitting elements arranged corresponding to the width of the display surface are sequentially turned on from one end to the other end so that the entire area of the display surface is displayed. And a second mode in which the light emitting elements are sequentially turned on and scanned within a narrower range than the scanning of the entire region, including the coordinate position detected in the first mode, Since the scanning period can be shortened by narrowing the scanning region, a display device is disclosed in which the followability of the light shielding object is improved and no interruption occurs even when a line is drawn.

  Further, in Patent Document 2, in addition to the first scanning region according to the first mode and the second scanning region according to the second mode, the second scanning region is narrower than the first scanning region. A detection device having a third mode for scanning a wider third scanning region and capable of detecting a coordinate position where no detection loss occurs even when the detection state is frequently interrupted, such as writing characters on the display surface Is disclosed.

  Furthermore, in Patent Document 3, when the movement of a light shielding object such as a finger or a pen is high speed, by reducing the number of detection beams in the light emitting element, the followability is ensured by shortening the scanning cycle, When the movement of the light shield is slow, it is possible to obtain more accurate coordinate position information by increasing the number of detection beams in the light emitting element and making the detection beam trajectory dense during scanning. In addition, a coordinate position detection device that can more accurately draw complicated characters or figures is disclosed.

JP 2001-306241 A JP 2005-284899 A JP 2007-65776 A

  However, in Patent Documents 1 to 3 described above, only a case where there is a single light shielding object is disclosed, and there is no contrivance or suggestion about the case where there are a plurality of light shielding objects. In the case where a plurality of light shielding objects come in contact with each other at the same time, it is practically difficult to cope with them.

  The present invention has been made in view of such circumstances, and an object of the present invention is to detect the position of one or a plurality of light-shielding objects based on a result of wide-area scanning that performs scanning over a wide range of a contacted surface. Then, narrow-area scanning is performed in a narrower range than the wide-area scanning for each of the light-shielding objects detected thereby, and the position of the light-shielding object is detected based on the result of the narrow-area scanning. Alternately detecting the position of the light shielding object based on the result of the wide area scanning and detecting the position of the light shielding object based on the result of the narrow area scanning, and detecting a change in the position of the light shielding object based on the result of the detection. By means of the touch panel device, display device, position detection method and computer program capable of realizing high-speed response and follow-up even when detecting simultaneous contact and separation of a plurality of light shielding objects on the contacted surface, The present invention provides a recording medium on which the computer program is recorded.

  The touch panel device according to the present invention includes a contacted surface and a scanning unit that scans light along the contacted surface. As a result of wide-area scanning that performs scanning in a wide range of the contacted surface, and in a narrow range. In the touch panel device that detects the position of the light-shielding object on the contacted surface based on the result of the narrow-area scanning that performs scanning, the first detection that detects the position of one or more light-shielding objects based on the result of the wide-area scanning And a second detection means for detecting the position of the light shielding object based on the result of the narrow-area scanning for each of the light shielding objects detected by the first detection means, the first detection means and The detection by the second detection means is performed alternately, and it is configured to detect the position change of the light shielding object based on the detection result.

  In the present invention, based on the result of wide-area scanning by the scanning means, the first detection means detects the position of one or more light shielding objects, and each of the light shielding objects detected by the first detection means is detected. Based on the result of the narrow area scanning, the second detection means detects the position of the light shielding object. The detection by the first detection unit and the detection by the second detection unit are alternately performed, and the position change of the light shielding object is detected based on the detection results.

  The touch panel device according to the present invention calculates a moving speed of the light shielding object detected by the second detection means and a storage unit that stores the position of the light shielding object detected by the first detection means and the second detection means. And a speed calculating unit, and configured to determine the order of the narrow area scanning based on a calculation result of the speed calculating unit.

  In the present invention, the storage unit stores a position of the light shielding object detected by the first detection unit and the second detection unit, and the speed calculation unit stores the light shielding object stored in the storage unit. Based on the position, the moving speed of the light shielding object detected by the second detection means is calculated. Based on the calculation result of such speed calculation means, the order of the narrow area scanning among the plurality of light shielding objects is determined.

  In the touch panel device according to the present invention, the storage unit stores a limit number indicating a limit on the number of light shielding objects detected by the first detection unit, and the number of light shielding objects detected by the second detection unit is greater than the limit number. In the case of being small, the detection by the first detection means is performed.

  In the present invention, the limit number is stored in the storage unit. For example, when the number of shades detected by the second detection unit is smaller than the limit number, the detection by the first detection unit is performed. Done.

  A display device according to the present invention includes the touch panel device according to any one of the above-described inventions, and a display unit that is covered with a contacted surface of the touch panel device, and includes the first detection unit and the second detection unit. Drawing is performed on the display unit based on the position of the light shielding object detected from the detection result.

  In the present invention, the position change (for example, movement) of the light shielding object on the contacted surface of the touch panel device is detected from the detection results of the first detection means and the second detection means, and based on this, Drawing on the display unit is performed in accordance with a change in the position of the light shielding object.

  The position detection method according to the present invention is a touch panel device including a contacted surface and a scanning unit that scans light along the contacted surface, and results of wide-area scanning that performs scanning over a wide range of the contacted surface, In the position detection method for detecting the position of the light shielding object on the contacted surface based on the result of narrow area scanning that performs scanning in a narrow range, the position of one or more light shielding objects is determined based on the result of the wide area scanning. The first detection step for detecting, and the second detection step for detecting the position of the light shielding object based on the result of the narrow-area scanning for each of the light shielding objects detected by the first detection step, are alternately performed. And a step of detecting a change in the position of the light-shielding object based on the detection results of the first detection step and the second detection step.

  A computer program according to the present invention is a wide area scan that performs scanning over a wide range of the contacted surface in a computer constituting a touch panel device including a contacted surface and a scanning unit that scans light along the contacted surface. And a computer program for detecting a position of a light-shielding object on the contacted surface based on a narrow-area scanning result of performing scanning in a narrow range, wherein the computer causes the computer to detect one or more based on the wide-area scanning result A first detection step for detecting the position of the light shielding object; and a second detection for causing the computer to detect the position of the light shielding object based on the result of the narrow scanning for each of the light shielding objects detected by the first detection step. And the position of the light-shielding object on the basis of the detection results of the first detection step and the second detection step performed alternately on the computer. Characterized in that to execute the step of detecting a reduction.

  In the present invention, the position of one or a plurality of light shielding objects is detected based on the result of the wide area scanning by the scanning unit, and based on the result of the narrow area scanning for each of the light shielding objects thus detected, The position of the light shield is detected. The position detection of the light shielding object based on the result of the wide area scanning and the position detection of the light shielding object based on the result of the narrow area scanning are alternately performed, and the position change of the light shielding object is detected based on the detection result. The

  A recording medium according to the present invention records the computer program of the above-described invention.

  In the present invention, the aforementioned computer program is recorded on the recording medium. The computer reads the computer program from the recording medium, and the above-described touch panel device, display device, and position detection method are realized by the computer.

  According to the present invention, it is possible to realize high-speed responsiveness and follow-up performance in detecting a light shielding object even when a plurality of light shielding objects contact and separate simultaneously on the contacted surface.

FIG. 1 is a conceptual diagram conceptually showing the electronic blackboard device of Embodiment 1 of the present invention. FIG. 2 is a functional block diagram showing a main configuration of the electronic blackboard device according to Embodiment 1 of the present invention. It is a functional block diagram which shows the principal part structure of a control part in the electronic blackboard apparatus of Embodiment 1 of this invention. It is a functional block diagram explaining the process of the light scanning in the electronic blackboard apparatus of Embodiment 1 of this invention. It is explanatory drawing explaining wide area scanning in the electronic blackboard apparatus of Embodiment 1 of this invention. It is explanatory drawing explaining the narrow region scan in the electronic blackboard apparatus of Embodiment 1 of this invention. It is a flowchart explaining the detection and drawing of a light-shielding object in the electronic blackboard device of Embodiment 1 of the present invention. In the electronic blackboard apparatus of Embodiment 1 of this invention, it is an illustration figure which shows an example of the light-shielding object which moves on the display surface of a display part. It is a functional block diagram which shows the principal part structure of a control part in the electronic blackboard apparatus of Embodiment 2 of this invention. It is a flowchart explaining the detection and drawing of a light-shielding object in the electronic blackboard device of Embodiment 2 of the present invention. It is a flowchart explaining the detection and drawing of a light-shielding object in the electronic blackboard device of Embodiment 2 of the present invention. It is a functional block diagram which shows the principal part structure of the electronic blackboard apparatus of Embodiment 3 of this invention.

  Hereinafter, a touch panel device, a display device, a position detection method, a computer program, and a recording medium according to an embodiment of the present invention will be described in detail with reference to the drawings, taking as an example a case of applying to a so-called electronic blackboard device.

(Embodiment 1)
FIG. 1 is a conceptual diagram conceptually showing the electronic blackboard device 100 according to the first embodiment of the present invention, and FIG. 2 is a functional block diagram showing the main configuration of the electronic blackboard device 100 according to the first embodiment of the present invention. It is.

  The electronic blackboard device 100 according to the first embodiment of the present invention includes a so-called optical touch panel device that includes a light emitting element and a light receiving element and detects the position of a light shielding object. For example, the electronic blackboard apparatus 100 is a personal computer via USB and HDMI. (Hereinafter referred to as PC). In FIG. 2, a portion surrounded by a dotted line corresponds to the touch panel device of the present invention.

  The electronic blackboard device 100 includes a control unit 1, a ROM 2, and a RAM 3. In addition, the electronic blackboard device 100 includes a storage unit 4 in which a coordinate history, which will be described later, is stored, a time measuring unit 5 that measures the passage of time from the current time and a predetermined time, and an I / O that transmits and receives data to and from the PC. F section 6 is provided.

  Further, the electronic blackboard apparatus 100 includes a display unit 7, a display control unit 8 that controls display of characters, line drawings, and the like on the display unit 7, and a display unit from the user based on a scanning result by a scanning unit 9 described later. 7 and a touch panel 10 for receiving input of position designation, characters, line drawings, and the like.

  The storage unit 4 is configured by a nonvolatile storage medium such as flash memory, EEPROM, HDD, MRAM (magnetoresistance memory), FeRAM (ferroelectric memory), or OUM. Further, the storage unit 4 stores, as the coordinate history, the position (coordinates) of the light shielding object detected by wide-area scanning and narrow-area scanning described later in association with time. Further, the storage unit 4 stores a narrow area described later corresponding to each light shielding object and a moving speed of the light shielding object described later for each light shielding object.

  The display unit 7 includes, for example, an LCD or an EL (Electroluminescence) panel, and the display unit 7 displays characters, line drawings, and the like received from the user via the touch panel 10. A touch panel 10 is provided so as to cover the display surface of the display unit 7.

  The display control unit 8 is configured by a processor such as a DSP (Digital Signal Processor), and controls image display on the display unit 7. The control unit 1 instructs display of characters, line drawings, and the like based on the coordinates related to the scanning result by the scanning unit 9, and the display control unit 8 causes the display unit 7 to display characters, line drawings, and the like accordingly.

  A control program is stored in the ROM 2 in advance, and the RAM 3 temporarily stores data and can be read out regardless of the storage order, storage position, or the like. The RAM 3 stores, for example, a program read from the ROM 2 and various data generated by executing the program.

  The control unit 1 loads the control program stored in advance in the ROM 2 onto the RAM 3 and executes it, thereby controlling the various hardware described above via the bus, creating the coordinate history, The entirety is operated as the electronic blackboard device 100 of the present invention.

  FIG. 3 is a functional block diagram showing a main configuration of the control unit 1 in the electronic blackboard device 100 according to Embodiment 1 of the present invention. The control unit 1 includes a CPU 11, a coordinate calculation unit 12, a light shield management unit 13, a first detection unit 14, and a second detection unit 15.

  The coordinate calculation unit 12 calculates coordinates on the display surface of the display unit 7 of a light shielding object such as a pen-shaped input device or a finger. Specifically, the coordinates of such a light shielding object are calculated based on an intensity signal described later, which is sent when the light blocking on the display surface of the display unit 7 is detected by the touch panel 10.

  The light shielding object management unit 13 manages the position (coordinates) of the light shielding object detected by the scanning of the scanning unit 9. That is, the light shielding object management unit 13 generates a coordinate history stored in the storage unit 4, updates the coordinate history, and the like.

  The first detection unit 14 detects the positions of one or more light shielding objects from a wide area, for example, the entire area on the display surface of the display unit 7. Specifically, the scanning unit 9 of the touch panel 10 scans the entire area on the display surface of the display unit 7 (hereinafter, referred to as wide area scanning), and the result of the wide area scanning acquired from the touch panel 10 is obtained. Based on the intensity signal, the first detection unit 14 detects the coordinates of the light shielding object on the display surface of the display unit 7.

  The second detection unit 15 detects the position of the light shielding object detected by the first detection unit 14 from a partial area on the display surface of the display unit 7. For example, when the first detection unit 14 detects the positions of a plurality of light shielding objects based on the result of the wide area scanning, the CPU 11 detects a narrow range of a predetermined range including the light shielding objects by a method described later. Set every time. The scanning unit 9 of the touch panel 10 performs light scanning (hereinafter referred to as narrow region scanning) on each set narrow region. At this time, the second detection unit 15 detects the coordinates of each light shielding object detected by the first detection unit 14 based on the intensity signal related to the result of the narrow area scanning acquired from the touch panel 10.

  The CPU 11 controls the light emitting element and the light receiving element of the scanning unit 9 and sets a narrow area for the narrow area scanning. That is, the CPU 11 sets a predetermined scanning region (narrow region) centered on the coordinates based on the coordinates of the light shielding object detected by the first detection unit 14. More specifically, a predetermined range on the X axis centered on the X coordinate of the light shield and a predetermined range on the Y axis centered on the y coordinate of the light shield are set.

  The touch panel 10 is a so-called optical touch panel. That is, when the light blocking is detected when the tip of the pen-type input device or the finger approaches the display surface of the display unit 7, the position of the light-shielding object (pen-type input device or finger) is determined. To detect. That is, a signal (intensity signal) related to the scanning result is sent to the control unit 1, and based on this, the coordinate calculation unit 12 calculates the coordinates of such a light shielding object. In this way, the touch panel 10 accepts input of position designation on the display unit 7, characters, line drawings, and the like from the user.

  The touch panel 10 includes a scanning unit 9 that scans light along the display surface of the display unit 7, and the scanning unit 9 includes a light emitting unit 91 having a plurality of light emitting elements that emit light, and a corresponding light emitting element. A light receiving unit 92 having a plurality of light receiving elements for receiving the light, an address decoder 93 for assigning a light emission signal and a light reception signal from the control unit 1 (CPU 11) to the light emitting unit 91 and the light receiving unit 92, and whether or not the light is received. And an A / D converter 94 for converting an analog signal from the light receiving unit 92 into a digital signal.

  FIG. 4 is a functional block diagram for explaining light scanning processing in the electronic blackboard device 100 according to the first embodiment of the present invention.

  The light emitting unit 91 has a multiplexer (not shown), and each of the light emitting elements is connected to the multiplexer. The light receiving unit 92 has a multiplexer (not shown), and each of the light receiving elements is connected to the multiplexer. Further, each light emitting element of the light emitting unit 91 is configured to correspond (oppose) to any one light receiving element of the light receiving unit 92.

  The CPU 11 of the control unit 1 outputs light emission signals for causing the plurality of light emitting elements to emit light to the address decoder 93 and outputs light reception signals for causing the plurality of light receiving elements to receive light to the address decoder 93. The address decoder 93 outputs, to the light emitting unit 91, a signal for specifying any light emitting element related to light emission among the light emitting elements in response to a signal from the CPU 11, and among the light receiving elements, the specified light emitting element A signal specifying the light receiving element corresponding to is output to the light receiving unit 92.

  The light emitting element thus identified emits infrared light, and the light receiving element corresponding to the light emitting element receives infrared light. At this time, an intensity signal indicating the intensity of the infrared light received by the light receiving element as a voltage value is output to the A / D converter 94. The A / D converter 94 converts the intensity signal into an 8-bit digital signal, for example, and outputs the converted intensity signal to the control unit 1. The control unit 1 sequentially repeats the process of acquiring the intensity signal from each light receiving element in order to acquire the intensity signal from all the light receiving elements.

  The CPU 11 of the control unit 1 calculates the amount of light received by the light receiving element based on the intensity signal acquired from each light receiving element. When the calculated amount of received light exceeds a predetermined threshold, the CPU 11 determines that the optical path of the infrared light received by the light receiving element is not blocked. When the calculated amount of received light is equal to or less than a predetermined threshold, it is determined that the optical path of infrared light received by the light receiving element is blocked.

  Based on the determination result of the CPU 11, the coordinate calculation unit 12, the first detection unit 14, and the second detection unit 15 calculate the position of the light shielding object. That is, the coordinate calculation unit 12, the first detection unit 14, and the second detection unit 15 identify a light receiving element whose optical path of infrared light is blocked, and based on the position of the identified light receiving element, A process of calculating the coordinates of the light shielding object on the display surface is performed.

  As described above, the touch panel 10 sends an intensity signal related to the results of the wide-area scanning and the narrow-area scanning by the scanning unit 9 to the control unit 1. At the time of the wide area scanning, light is emitted and received by all the light emitting elements and the light receiving elements, and at the time of the narrow area scanning, only the light emitting elements and the light receiving elements related to the respective narrow areas set by the CPU 11 are used. Light is emitted and received.

  Hereinafter, the narrow area scanning and the wide area scanning will be described in detail. FIG. 5 is an explanatory diagram for explaining wide area scanning in the electronic blackboard apparatus 100 according to the first embodiment of the present invention. FIG. 6 is for explaining narrow area scanning in the electronic blackboard apparatus 100 according to the first embodiment of the present invention. It is explanatory drawing.

  The display surface of the display unit 7 has a rectangular shape, and a plurality of light emitting elements 911, 911,... The light emitting element 911 is, for example, a light emitting diode (LED) that emits infrared light. In the drawing, the optical path of the infrared light emitted from each light emitting element 911 is indicated by a solid arrow.

  The left light emitting elements 911, 911,... Are provided such that the optical paths of the infrared light emitted by the respective light emitting elements 911 are parallel to each other along the display surface. 911,... Are also provided in the same manner.

  That is, the upper light emitting elements 911, 911,... In the left-right direction (X-axis direction) as viewed in the drawing and the left light-emitting elements 911, 911,. The optical paths are provided so as to be orthogonal to each other.

  Further, light receiving elements 921, 921,... Are provided on the display surface of the display unit 7 at positions facing the light emitting elements 911, 911,.

  That is, a plurality of light emitting elements 921, 921,... Are arranged side by side along the edge on the right side and the lower side of the display surface of the display unit 7 in the drawing. The light receiving element 921 is a light receiving diode that receives infrared light. Infrared light from each light emitting element 911 is configured to be received by the opposing light receiving element 921.

  As in the case of the light emitting elements, the lower light receiving elements 921, 921,... And the plurality of right light receiving elements 921, 921,.

In the case of the wide area scanning, the scanning unit 9 performs a process of scanning the entire display surface of the display unit 7 and detecting a light shielding object. That is, the light emitting elements 911 are sequentially caused to emit light one by one from one end to the other end in the X-axis direction, and the light blocking object on the display surface of the display unit 7 is detected.
In the detection of such a light blocking object, the light blocking element may be configured to detect the light blocking object based on only the light in the orthogonal direction out of the light emitted from the light emitting element 911, and based on the light including the light from the oblique direction. The light shielding object may be detected.

  In the case of the narrow area scanning, scanning is performed only on the narrow area set by the CPU 11. Specifically, for example, when a plurality of light shielding objects are detected by wide area scanning, the CPU 11 sets a narrow area corresponding to each light shielding object. The narrow area is, for example, a range on the X axis of eight light emitting elements 911 centered on the X coordinate of each light shielding object, and eight light emitting elements 911 centered on the Y coordinate of the light shielding object. This is the range on the Y axis.

  On the other hand, it takes about 100 μs to determine that one light emitting element 911 emits infrared light and the light receiving element 921 corresponding to the light emitting element 911 receives light. Therefore, for example, when the display unit 7 is a large display of 60 inches and the number of light emitting elements 911 in the X-axis direction is about 300, the time required to scan the entire screen (wide area scan) is about 30 ms. It becomes.

  Since the response speed of a mouse, which is a general input device, is 10 ms or less, responsiveness is very poor when a wide-area scan is performed at 30 ms, and the user follows high-speed drawing operations such as lines being cut off during drawing. I can't.

  In the narrow area scanning, the response time is 1.6 ms corresponding to 16 light emitting elements 911, and the followability is improved. However, when only the narrow area scanning is repeated, it corresponds to the addition of a new light shielding object. There is a problem that it cannot be done.

  Therefore, in the present invention, the narrow area scanning and the wide area scanning are alternately performed. That is, first, when the wide area scan is performed and a light shielding object is detected by the wide area scanning, the narrow area scanning is performed on each light shielding object, so that the periphery of the detected light shielding object is intensively scanned. To improve responsiveness. Accordingly, it is possible to cope with a high-speed drawing operation by a user and addition of a new light shielding object.

  The intensity signals related to the results of such wide-area scanning and narrow-area scanning are sent to the control unit 1, and as described above, the coordinates of the light shielding object are calculated based on the intensity signals, and the coordinates are detected. And a coordinate history associated with the timing result (time) from the timing unit 5 is generated. The generated coordinate history is stored in the storage unit 4, and the display control unit 8 displays a line drawing on the display unit 7 based on the coordinate history stored in the storage unit 4, for example.

  Furthermore, it is preferable to provide a limited number in the wide area scanning. Such a “restricted number” limits the number of shades detected by the scanning by the scanning unit 9. Actually, there is no limit to the number of shades detected in the wide area scan. However, if the number of shades is too large, the required time in the wide area scan and the narrow area scan becomes long. Therefore, in order to maintain high responsiveness, the limit number It is preferable to limit the number of shades detected by wide-area scanning. In the following, a case where the limit number is “5” will be described as an example. The limit number is not essential.

  FIG. 7 is a flowchart for explaining detection and drawing of a light shielding object in the electronic blackboard apparatus 100 according to the first embodiment of the present invention. For convenience of explanation, as shown in FIG. 8, five light-shielding objects (pen-shaped input device, finger, etc.) are detected on the display surface of the display unit 7, and these are moved in the direction indicated by the arrows in the figure. It is assumed that drawing is performed on the display unit 7 according to the above.

  First, the scanning unit 9 performs the above-described wide area scanning until a light shielding object is detected on the display surface of the display unit 7 (S101).

  At this time, based on the intensity signal related to the result of the wide area scanning by the scanning unit 9, the CPU 11 determines whether or not a light shielding object has been detected (S102). If the CPU 11 determines that no light blocking object has been detected (S102: NO), the process returns to S101, and the wide area scanning is performed again.

  On the other hand, when the CPU 11 determines that a light shielding object has been detected (S102: YES), the first detection unit 14 detects the coordinates of the light shielding object by the above-described method based on the intensity signal related to the result of the wide area scanning. As described above, since the limit number in the wide area scanning is “5”, it is possible to detect a maximum of five light shielding objects. The coordinates of the five light shielding objects (P1, P2, P3, P4, P5) detected in this way are stored in the storage unit 4 (S103). However, the scanning unit 9 stops the wide-area scanning as soon as the limited number of five shades are detected during the wide-area scanning.

  At this time, the light shielding object management unit 13 generates a coordinate history in which the coordinates and the times for each light shielding object are associated in the detection order by the method described above, and the generated coordinate history is stored in the storage unit 4. Further, the display control unit 8 performs drawing on the display unit 7 based on the coordinate history, and thereafter performs drawing on the display unit 7 in accordance with addition, update, deletion, etc. of the coordinate history.

  Next, the CPU 11 sets M narrow areas. That is, since there are five light shielding objects detected by the wide area scanning, the CPU 11 sets five narrow areas corresponding to the respective light shielding objects by the method described above (S104). Hereinafter, for convenience of description, the set five narrow areas are referred to as “first narrow area”, “second narrow area”,. For example, “first narrow area” corresponds to P1, and “second narrow area” corresponds to P2.

Thereafter, the scanning unit 9 performs narrow area scanning on each narrow area set by the CPU 11.
Specifically, the CPU 11 assigns “1” to “T” (S105), and instructs the scanning unit 9 to perform narrow-area scanning on the “T-th” narrow area. In response to an instruction from the CPU 11, the scanning unit 9 performs narrow-area scanning on the “T-th” narrow area (S 106), but “T” is “1”. Scan.

  Next, based on the intensity signal related to the result of the narrow area scan for the first narrow area, the second detection unit 15 detects the coordinates of the light shielding object (P1) in the first narrow area. Further, the CPU 11 determines the presence or absence of the light shielding object (P1) in the first narrow area based on the detection result by the second detection unit 15 (S107).

  When the coordinates of the light shielding object are detected by the second detection unit 15 and the CPU 11 determines that there is a light shielding object in the first narrow area (S107: YES), the coordinates detected by the second detection unit 15 are stored in the storage unit. 4 (S109). That is, the light shield management unit 13 writes the coordinates detected by the second detection unit 15 in the coordinate history stored in the storage unit 4. Thus, when P1 moves, the coordinates of P1 after the movement are stored, and drawing based on the coordinates is performed. Accordingly, it is possible to perform drawing according to the movement (position change) of the light shielding object with high responsiveness.

  On the other hand, when the coordinate detection by the second detection unit 15 fails, for example, when P1 is separated from the display surface of the display unit 7, the CPU 11 determines that there is no light shielding object in the first narrow area (S107). : NO), the shade object management unit 13 deletes the coordinate of P1 from the coordinate history stored in the storage unit 4 (S108).

  Thereafter, the CPU 11 determines whether or not the number of “M” is equal to the number of “T” (S110). Here, “T” is “1” and “M” is “5” (see S104). Accordingly, the CPU 11 determines that the number of “M” is not the same as the number of “T” (S110: NO), substitutes “T + 1” for “T” (S111), and returns to the process of S106 again. That is, since “T” is “1”, “2” is newly assigned to “T”, and the process of S106 is executed.

  Such a process is repeated until it is determined in S110 that the number of “M” is the same as the number of “T”, that is, until “T” becomes “5”. In other words, the processes from S106 to S111 are repeated until the narrow area scanning for the five narrow areas is completed.

  For example, when the narrow area scan for the “fifth” narrow area is completed, the CPU 11 determines that the number of “M” is the same as the number of “T” (S110: YES), and stores it in the storage unit 4. Based on the coordinate history that has been set, it is determined whether or not the current number of light-shielding objects on the display surface of the display unit 7 is less than “5”, which is the limit number (S112).

  When the CPU 11 determines that the current number of light-shielding objects on the display surface of the display unit 7 is not less than the limit number (S112: NO), that is, in the above processing, the detection of coordinates by the second detection unit 15 fails and the above-described processing is performed. If there is no shade object whose coordinates are deleted from the coordinate history, the process returns to S105, and the processes from S105 to S111 are repeated.

  When the CPU 11 determines that the current number of light-shielding objects on the display surface of the display unit 7 is less than the limit number (S112: YES), that is, in the above processing, the coordinate detection by the second detection unit 15 has failed. If there is a light shielding object whose coordinates are deleted from the coordinate history, it is determined whether or not the current number of light shielding objects on the display surface of the display unit 7 is “0” (S113).

  When the CPU 11 determines that the current number of light shielding objects on the display surface of the display unit 7 is not “0” (S113: NO), the process returns to S101, and the scanning unit 9 performs wide area scanning again, and each light shielding is performed. This corresponds to the addition of a new light blocking object during the narrow-range scanning of the object.

  On the other hand, when the CPU 11 determines that the current number of light shielding objects on the display surface of the display unit 7 is “0” (S113: YES), for example, when all the light shielding objects are separated from the display surface of the display unit 7. Then, the display control unit 8 is instructed to stop drawing. The display control unit 8 stops drawing on the display unit 7 in response to an instruction from the CPU 11 (S114).

  As described above, in the electronic blackboard device 100 according to the present invention, wide-area scanning and narrow-area scanning are alternately performed, so that it is possible to detect a plurality of light shielding objects while maintaining high responsiveness, and the display unit 7. It can quickly respond to the contact and separation between the display surface and the shade.

  The present invention is not limited to the above description. For example, when the coordinates of the light shielding object are detected by the narrow area scanning after the wide area scanning and the position (coordinates) of the light shielding object is changed, the position of the light shielding object after the position change is the center of the narrow area. In this case, the CPU 11 may be configured to reset the narrow area each time.

(Embodiment 2)
The electronic blackboard device 100 according to the second embodiment of the present invention has substantially the same configuration as the electronic blackboard device 100 according to the first embodiment, but is different from the first embodiment in the configuration of the control unit 1.

  FIG. 9 is a functional block diagram showing a main configuration of the control unit 1 in the electronic blackboard device 100 according to Embodiment 2 of the present invention. In the electronic blackboard device 100 according to the second embodiment of the present invention, the control unit 1 is similar to the first embodiment in that the CPU 11, the coordinate calculation unit 12, the light shielding object management unit 13, the first detection unit 14, A second detector 15, and a speed calculator 16.

  When the light shielding object moves on the display surface of the display unit 7, the speed calculation unit 16 calculates the moving speed of the light shielding object based on the coordinate history stored in the storage unit 4. For example, the speed calculation unit 16 includes coordinates and time corresponding to a predetermined light shielding object according to the result of the previous narrow area scanning, and coordinates and time corresponding to the light shielding object according to the result of the current narrow area scanning. Based on the above, the moving speed of the shade is calculated.

  As described above, the moving speed of the light shielding object calculated by the speed calculation unit 16 is associated with each light shielding object and stored in the storage unit 4. Moreover, it is not restricted to this. Instead of the coordinates and time related to the result of the previous narrow area scan, the coordinates and time related to the result of the wide area scan performed immediately before the narrow area scan may be used.

  The electronic blackboard device 100 according to Embodiment 2 of the present invention has the above-described configuration, and the order of the narrow area scanning is determined based on the calculated moving speed of each light shielding object. That is, it is determined in what order the narrow area scanning is performed on a plurality of light shielding objects according to the moving speed of each light shielding object, and the scanning unit 9 performs the narrow area scanning based on the determined result. .

  Furthermore, in Embodiment 2 of the present invention, a designation number “N” for designating any shade object belonging to the low speed group described later is stored in the storage unit 4. The designated number “N” stores “0” as a default.

  10 and 11 are flowcharts for explaining detection and drawing of a light shielding object in the electronic blackboard apparatus 100 according to the second embodiment of the present invention. For convenience of explanation, as shown in FIG. 8, five light-shielding objects (pen-shaped input device, finger, etc.) are detected on the display surface of the display unit 7, and these are moved in the direction indicated by the arrows in the figure. It is assumed that drawing is performed on the display unit 7 in response to the above, and the limit number in the wide-area scanning is “5” as in the first embodiment.

  First, the scanning unit 9 performs the above-described wide area scanning until a light shielding object is detected on the display surface of the display unit 7 (S201).

  At this time, based on the intensity signal related to the result of the wide area scanning by the scanning unit 9, the CPU 11 determines whether or not a light shielding object has been detected (S202). If the CPU 11 determines that no light shielding object has been detected (S202: NO), the process returns to S201, and the wide area scanning is performed again.

  On the other hand, when the CPU 11 determines that a light shielding object has been detected (S202: YES), the first detection unit 14 detects the coordinates of the light shielding object by the above-described method based on the intensity signal related to the result of the wide area scanning. As described above, a maximum of five light shielding objects can be detected. The coordinates of the five light shielding objects (P1, P2, P3, P4, P5) detected in this way are stored in the storage unit 4 (S203). However, the scanning unit 9 stops the wide-area scanning as soon as the limited number of five shades are detected during the wide-area scanning.

  That is, the shading object management unit 13 generates a coordinate history, and the generated coordinate history is stored in the storage unit 4. At this time, the display control unit 8 performs drawing on the display unit 7 based on the coordinate history, and thereafter performs drawing on the display unit 7 in accordance with addition, update, deletion, etc. of the coordinate history.

  Next, the CPU 11 sets M narrow areas. That is, since there are five light shielding objects detected by the wide area scanning, the CPU 11 sets five narrow areas corresponding to the respective light shielding objects (S204). The setting of such a narrow area has already been described, and detailed description thereof will be omitted. Hereinafter, the narrow areas corresponding to P1, P2, P3, P4, and P5 are referred to as P1-corresponding narrow area, P2-corresponding narrow area, P3-corresponding narrow area, P4-corresponding narrow area, and P5-corresponding narrow area, respectively.

  Next, the CPU 11 performs grouping based on the moving speed for the five detected light shielding objects (S205). In the grouping, for example, the light shielding objects are defined in two groups of high speed and low speed. The definition is performed based on the calculation result by the speed calculation unit 16. For example, the CPU 11 assigns the light shielding object to the high speed group when the moving speed of the predetermined light shielding object is 10 cm / s or more, and assigns the light shielding object to the low speed group when the moving speed is 10 cm / s or less.

  On the other hand, when the moving speed cannot be calculated by the speed calculating unit 16 as after the first wide-area scanning, it is configured to be assigned to the high speed group as a default. In the following, for convenience of explanation, an example is given in which the moving speed is fast in the order of P1, P2, P3, P4, and P5, P1 and P2 are assigned to the high speed group, and P3, P4, and P5 are assigned to the low speed group. explain.

  At this time, the shading object management unit 13 re-stores the shading object for each group and assigns a predetermined allocation number. For example, “1” and “2” are assigned to the high-speed groups P1 and P2, respectively, and “1”, “2” and “3” are assigned to the low-speed groups P3, P4 and P5, respectively. Is attached.

  As described above, after grouping based on the moving speed, first, narrow area scanning is performed on the high-speed group.

  Specifically, the CPU 11 determines whether or not there is a light shielding object belonging to the high speed group based on the grouping result (S206). When the CPU 11 determines that there is no light shielding object belonging to the high speed group (S206: NO), the process proceeds to S213.

  On the other hand, if the CPU 11 determines that there is a light shield belonging to the high speed group (S206: YES), the CPU 11 instructs the scanning unit 9 to execute narrow area scanning. In response to an instruction from the CPU 11, the scanning unit 9 performs narrow area scanning on a narrow area corresponding to each light shield belonging to the high speed group.

  Also in the narrow area scan for such a high-speed group, the scanning unit 9 performs the narrow area scan based on the moving speed of the light shielding object, for example. As described above, since the moving speed of P1 is faster than that of P2, narrow area scanning by the scanning unit 9 is performed first in the narrow area corresponding to P1 (S207).

  Next, based on the intensity signal related to the result of narrow-area scanning for the P1-corresponding narrow area, the second detection unit 15 detects the coordinates of the light shielding object (P1) in the P1-corresponding narrow area. Further, the CPU 11 determines the presence / absence of the light shielding object (P1) in the P1-corresponding narrow area based on the detection result by the second detection unit 15 (S208).

  When the coordinates of the light shielding object are detected by the second detection unit 15 and the CPU 11 determines that there is a light shielding object in the P1 compatible narrow area (S208: YES), the coordinates detected by the second detection unit 15 are stored in the storage unit 4. (S209). That is, the light shield management unit 13 writes the coordinates detected by the second detection unit 15 in the coordinate history stored in the storage unit 4. Thus, when P1 moves, the coordinates of P1 after the movement are stored, and drawing based on the coordinates is performed. Accordingly, it is possible to perform drawing according to the movement (position change) of the light shielding object with high responsiveness. Furthermore, since the narrow area scan with respect to P1 having the fastest movement speed is performed first, it is possible to cope with the high-speed movement of the light shield.

  Next, the speed calculation unit 16 calculates the moving speed of P1 based on the coordinate history stored in the storage unit 4 by the method described above (S210), and the calculated moving speed is stored in the storage unit 4 again. .

  On the other hand, when the detection of the coordinates by the second detection unit 15 fails, for example, when P1 is separated from the display surface of the display unit 7, the CPU 11 determines that there is no light blocking object in the P1 corresponding narrow area (S208: NO), the shade object management unit 13 deletes the coordinate of P1 from the coordinate history stored in the storage unit 4 (S211).

  After the process of S210 or S211, the CPU 11 determines whether or not the narrow area scanning for all the light shielding objects belonging to the high speed group is completed based on the grouping result (S212). In the above description example, since only narrow area scanning for P1 (P1 corresponding narrow area) is performed, the CPU 11 determines that narrow area scanning for all the light shielding objects belonging to the high-speed group has not been completed (S212). : NO), the process is returned to S207.

  Thereafter, when the above-described processing from S207 to S211 is performed also on P2 (P2-compatible narrow area), the CPU 11 determines that narrow area scanning has been completed for all the light shielding objects belonging to the high-speed group (S212). : YES), the process proceeds to S213.

  As described above, when it is determined in S212 that the narrow area scanning for all the light shielding objects belonging to the high speed group has been completed, or when it is determined in S206 that there is no light shielding object belonging to the high speed group, the CPU 11 performs the grouping. Based on the result, it is determined whether there is a light shield belonging to the low speed group (S213).

  When the CPU 11 determines that there is no light shielding member belonging to the low speed group (S213: NO), the process proceeds to S222. On the other hand, if the CPU 11 determines that there is a light shield belonging to the low speed group (S213: YES), the CPU 11 determines whether or not the narrow area scan for the light shield belonging to the low speed group is the first time (S214).

  Such a determination is made based on the designated number “N” stored in the storage unit 4. For example, when the designated number “N” is “0”, the CPU 11 determines that the narrow area scan related to the low speed group is the first time, and when the designated number “N” is not “0”, the narrow area scan is 1 Judge that it is not the first time.

  When the CPU 11 determines that the narrow area scanning is not the first time (S214: NO), the CPU 11 instructs the scanning section 9 to perform the narrow area scanning with respect to the light shielding object corresponding to the designated number “N”. Specifically, the CPU 11 instructs narrow area scanning of the light shielding objects belonging to the low-speed group and having the assigned number equal to the designated number “N”.

  In response to the instruction from the CPU 11, the scanning unit 9 performs narrow-area scanning on the narrow area corresponding to the light shielding object whose allocation number is “N” (S 215).

  On the other hand, when the CPU 11 determines that the narrow-area scanning related to the low speed group is the first time (S214: YES), the CPU 11 substitutes “1” for the designated number “N” (S216), Among them, the narrow area scanning is instructed for the light shielding object whose allocation number is the same as the designated number “N”, that is, the light shielding object whose allocation number is “1”. In this case, the scanning unit 9 performs narrow area scanning on the narrow area corresponding to the light shielding object having the allocation number “1” (S215).

  As described above, when the narrow area scan for P3 having the allocation number “1” is performed, the second detection unit 15 responds to the P3 based on the intensity signal related to the result of the narrow area scan for the P3 corresponding narrow area. The coordinates of the light shield (P3) in the narrow area are detected. Further, the CPU 11 determines the presence / absence of the light shielding object (P3) in the P3-compatible narrow area based on the detection result by the second detection unit 15 (S217).

  When the coordinates of the light shielding object are detected by the second detection unit 15 and the CPU 11 determines that there is a light shielding object in the P3 compatible narrow area (S217: YES), the coordinates detected by the second detection unit 15 are stored in the storage unit 4. (S218). That is, the light shield management unit 13 writes the coordinates detected by the second detection unit 15 in the coordinate history stored in the storage unit 4. Thus, when P3 moves, the coordinates of P3 after the movement are stored, and drawing based on the coordinates is performed.

  Next, the speed calculation unit 16 calculates the moving speed of P3 by the method described above based on the coordinate history stored in the storage unit 4 (S219), and the calculated moving speed is stored in the storage unit 4 again. .

  On the other hand, when the coordinate detection by the second detection unit 15 fails, for example, when P3 is separated from the display surface of the display unit 7, the CPU 11 determines that there is no light shielding object in the P3-compatible narrow area (S217: NO), the shade object management unit 13 deletes the coordinates of P3 from the coordinate history stored in the storage unit 4 (S220).

  After the process of S219 or S220, the CPU 11 determines whether or not the narrow area scanning for all the light shielding objects belonging to the low speed group has been completed based on the grouping result (S221).

  In the above description example, since only the narrow area scan for P3 (P3 compatible narrow area) is performed, the CPU 11 determines that the narrow area scan for all the light shielding objects belonging to the low speed group has not been completed (S221). : NO), “N + 1” is substituted as the designated number “N” (S225). That is, since “N” is currently “1”, “2” is substituted for “N” and stored in the storage unit 4. Therefore, next time, P4 whose designated number is “2” (assignment number is “2”) is the target of narrow area scanning. Thereafter, the process returns to S206.

  However, since the processing here returns to S206, the narrow area scanning is again performed on the light shielding objects belonging to the high speed group. In other words, when only the narrow area scanning for one (P3) of the light shielding objects belonging to the low speed group is completed, the narrow area scanning is again performed on the light shielding objects belonging to the high speed group, and the light shielding belonging to the high speed group. After the narrow area scan for the object is completed, the narrow area scan for the low speed group P4 is performed.

  In other words, after narrow band scanning is performed in the order of P1, P2, and P3, narrow band scanning is performed in the order of P1, P2, and P4, and then narrow band scanning is performed in the order of P1, P2, and P5. . As described above, in the electronic blackboard device 100 according to Embodiment 2 of the present invention, the priority of narrow area scanning with respect to a light-shielding object (high-speed group) that moves quickly is increased, and the followability to the light-shielding object is improved.

  As described above, when the narrow-area scanning in the order of P1, P2, and P5 is completed, that is, when the above-described processing from S215 to S220 is performed for P5 (P5-compatible narrow area), The CPU 11 determines that narrow area scanning has been completed for all the light shields belonging to the low speed group (S221: YES), and the process proceeds to S222.

  As described above, when it is determined in S221 that the narrow area scanning for all the light shielding objects belonging to the low speed group has been completed, or when it is determined in S213 that there is no light shielding object belonging to the low speed group, the CPU 11 stores the storage unit 4. It is determined whether the current number of light-shielding objects on the display surface of the display unit 7 is less than “5”, which is the limit number, based on the coordinate history stored in (S222).

  When the CPU 11 determines that the current number of light-shielding objects on the display surface of the display unit 7 is not less than the limit number (S222: NO), that is, in the above processing, the coordinate detection by the second detection unit 15 has failed and the above-described processing has failed. If there is no shade object whose coordinates have been deleted from the coordinate history, the process returns to S205, and at this time, the designated number “N” stored in the storage unit 4 is reset.

  When the CPU 11 determines that the number of light-shielding objects on the display surface of the current display unit 7 is less than the limit number (S222: YES), that is, in the above processing, the coordinate detection by the second detection unit 15 has failed. If there is a light shielding object whose coordinates are deleted from the coordinate history, it is determined whether or not the current number of light shielding objects on the display surface of the display unit 7 is “0” (S223).

  If the CPU 11 determines that the current number of light-shielding objects on the display surface of the display unit 7 is not “0” (S223: NO), the process returns to S201, and the scanning unit 9 performs wide-area scanning again, and each light-shielding object is detected. This corresponds to the addition of a new light blocking object during the narrow-range scanning of the object.

  On the other hand, when the CPU 11 determines that the current number of light shielding objects on the display surface of the display unit 7 is “0” (S223: YES), for example, when all the light shielding objects are separated from the display surface of the display unit 7. Then, the display control unit 8 is instructed to stop drawing. The display control unit 8 stops drawing on the display unit 7 in response to an instruction from the CPU 11 (S224).

  As described above, in the electronic blackboard device 100 according to the present invention, narrow area scanning is performed based on the moving speed of the light shielding object, so that the followability with respect to the light shielding object is improved and the light shielding object moves at a high speed. Drawing can be performed in accordance with the movement of the light shield.

  On the other hand, since the moving speed of the light blocking object is fast, a case where the light blocking object moves beyond the narrow area before the next narrow area scanning is assumed. In such a case, since it is detected as a new light shielding object by the wide-area scanning performed alternately, an appropriate countermeasure can be taken.

  In the above description, the case of performing the grouping process has been described as an example, but the present invention is not limited to this. For example, without performing the grouping, based on the moving speed calculated by the speed calculating unit 16, the scanning unit 9 performs the narrow area scanning on the narrow area corresponding to the light shielding object in the descending order of the moving speed. It may be configured.

  The present invention is not limited to the above description. For example, the processing performed by the control unit 1, the storage unit 4, and the time measuring unit 5 as described above may be performed by a PC connected to the electronic blackboard device 100 according to the present invention. .

  Furthermore, in the above description, the narrow area scan is applied to the light shielding object belonging to the high speed group while the light shielding object belonging to the high speed group is subjected to the narrow area scanning. Although the case where it does is demonstrated and demonstrated as an example, it is not restricted to this. For example, in the case of narrow-band scanning for a high-speed group, the scanning range may be widened compared to narrow-band scanning for a low-speed group.

  That is, in the above-described example, when narrow-area scanning is performed, scanning is performed in a range corresponding to eight light emitting elements 911, which is the case where the same is applied to the high speed group and the low speed group. . However, the present invention is not limited to this, and in the case of narrow-area scanning for a high-speed group, such a scanning range may be expanded to a range corresponding to 16 light emitting elements 911 and scanning may be performed.

  The same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

(Embodiment 3)
FIG. 12 is a functional block diagram showing the main configuration of the electronic blackboard device 100 according to Embodiment 3 of the present invention. The electronic blackboard device 100 according to the third embodiment is configured such that a computer program for performing an operation can be provided on a portable recording medium A such as a CD-ROM via the I / F unit 6. ing. Furthermore, the electronic blackboard device 100 according to the third embodiment is configured such that the computer program can be downloaded from an external device (not shown) via the communication unit 20. The contents will be described below.

  The electronic blackboard device 100 according to the third embodiment includes an exterior (or interior) recording medium reading device (not shown), and the recording medium reading device includes one or a plurality of light shielding units based on the result of the wide-area scanning. The positions of the objects are detected (second detection), and the positions of the light shielding objects are detected (second detection) based on the results of the narrow-area scanning with respect to each of the detected light shielding objects. Based on the detection results of the detection step and the second detection step, a portable recording medium A on which a program for detecting a change in the position of the light shielding object is recorded is inserted, and for example, the CPU 11 installs this program in the ROM 2. Such a program is loaded into the RAM 3 and executed. Thereby, it functions as the electronic blackboard device 100 of the present invention of Embodiment 1.

The recording medium may be a so-called program medium, a tape system such as a magnetic tape and a cassette tape, a magnetic disk such as a flexible disk and a hard disk, and a disk system of an optical disk such as a CD-ROM / MO / MD / DVD, It may be a medium carrying a fixed program code including a card system such as an IC card (including a memory card) / optical card or a semiconductor memory such as a mask ROM, EPROM, EEPROM, flash ROM or the like.

  It may be a medium that fluidly carries the program code so as to download the program code from the network via the communication unit 20. When the program is downloaded from the communication network in this way, the download program may be stored in the main device in advance or may be installed from another recording medium. The present invention can also be realized in the form of a computer data signal embedded in a carrier wave in which the program code is embodied by electronic transmission.

  The same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

DESCRIPTION OF SYMBOLS 1 Control part 4 Memory | storage part 7 Display part 9 Scanning part 10 Touch panel 11 CPU
14 1st detection part 15 2nd detection part 16 Speed calculation part 100 Electronic blackboard apparatus A Recording medium

Claims (7)

A contact surface and scanning means for scanning light along the contact surface; a result of wide-area scanning that scans in a wide range of the contacted surface; and a result of narrow-area scanning that scans in a narrow range In the touch panel device for detecting the position of the light blocking object on the contacted surface,
First detection means for detecting positions of one or more light-shielding objects based on the result of the wide-area scanning;
Second detection means for detecting the position of the light shielding object based on the result of the narrow scanning for each of the light shielding objects detected by the first detection means,
The touch panel device is characterized in that the detection by the first detection means and the second detection means is alternately performed, and the position change of the light shielding object is detected based on the detection result. A storage unit for storing a position of the light shielding object detected by the first detection unit and the second detection unit;
Speed calculating means for calculating the moving speed of the light shielding object detected by the second detecting means,
2. The touch panel device according to claim 1, wherein the order of the narrow area scanning is determined based on a calculation result of the speed calculation means. The storage unit stores a limit number indicating a limit on the number of shades detected by the first detection unit,
3. The touch panel device according to claim 2, wherein when the number of light shielding objects detected by the second detection unit is smaller than the limit number, the detection by the first detection unit is performed. A touch panel device according to any one of claims 1 to 3,
A display unit covered with a contacted surface of the touch panel device,
A display device characterized in that drawing is performed on the display unit based on a position of a light shielding object detected from detection results of the first detection means and the second detection means. A touch panel device including a contacted surface and a scanning unit that scans light along the contacted surface, a result of wide-area scanning that scans in a wide range of the contacted surface, and a narrow region that scans in a narrow range In the position detection method for detecting the position of the light blocking object on the contacted surface based on the result of scanning,
A first detection step of detecting a position of one or more light-shielding objects based on the result of the wide-area scanning;
A second detection step of detecting the position of the light shielding object based on the result of the narrow-area scanning for each of the light shielding objects detected by the first detection step;
And a step of detecting a change in the position of the light-shielding object based on the results of detection by the first detection step and the second detection step performed alternately. As a result of wide-area scanning that scans in a wide range of the contacted surface, and scanning in a narrow range on a computer that forms a touch panel device including a contacted surface and a scanning unit that scans light along the contacted surface In the computer program for detecting the position of the light-shielding object on the contacted surface based on the result of narrow-area scanning,
A first detection step for causing a computer to detect the position of one or more light-shielding objects based on the result of the wide-area scanning;
A second detection step for causing a computer to detect the position of the light shielding object based on the result of the narrow-area scanning for each of the light shielding objects detected by the first detection step;
A computer program for causing a computer to execute a step of detecting a change in position of a light shielding object based on a result of detection in the first detection step and the second detection step performed alternately.   A computer-readable recording medium on which the computer program according to claim 6 is recorded.

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