JP2016206840A - Coordinate detection apparatus and electronic information board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect touch coordinates of light-emitting input means and multiple pieces of non-light-emitting input means.SOLUTION: A coordinate detection apparatus includes: a light-emitting unit 410 which projects a plurality of light fluxes in a first direction in rows, along a surface of a display surface 22 of a display unit 20; a light-receiving sensor 430 which receives the light fluxes projected by the light-emitting unit 410, to output a first light-receiving signal; a light-emitting unit 420 which projects a plurality of light fluxes in rows in a second direction which crosses the first direction, along the surface of the display surface 22; a light-receiving sensor 440 which receives the light fluxes projected by the light-emitting unit 420, to output a second light-receiving signal; light-receiving units 300, 310 which receive the light from a pen input device 100 spaced from the light-receiving units to emit light when in contact with the display surface 22, to output a third light-receiving signal; and a coordinate detection unit 350 which detects a touch coordinate of a finger 200 touching the display surface 22, on the basis of the first and second light-receiving signals, and detects a touch coordinate of the pen input device 100 touching the display surface 22, on the basis of the third light-receiving signal.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a coordinate detection device and an electronic information board.

In recent years, an image display device such as a liquid crystal panel, a coordinate detection device that detects the coordinates of input means on the display surface of the image display device, and a control device that displays various images written based on coordinate data from the coordinate detection device An electronic information board called an interactive white board (IWB) provided with is widely used.
Various types of coordinate detection devices used for such electronic information boards have been proposed. Among them, a pen-type input device that is a light-emitting input device including a light-emitting device as an input device, and a non-light-emitting device that does not include a light-emitting device. 2. Description of the Related Art A coordinate detection device that can distinguish and detect an input means such as a finger is known.

  In Patent Document 1, as a coordinate detection device that acquires the coordinates of a plurality of pen-type input devices having light-emitting means and non-light-emitting input means, light of different wavelengths from the plurality of pen-type input devices incident on the light guide plate is used. A coordinate detection apparatus that detects and detects scattering of a light beam emitted along a light guide plate by a non-light-emitting input unit is disclosed.

However, the conventional coordinate detection device can detect the coordinates of the pen-type input device and the non-light-emitting input means, but has a problem that it cannot detect the coordinates of a plurality of non-light-emitting input means.
The present invention has been made in view of the above, and an object of the present invention is to provide a coordinate detection device that can detect the coordinates of a light emission input unit and a plurality of non-light emission input units.

  In order to solve the above-mentioned problem, the invention according to claim 1 is characterized in that the first light receiving means for receiving the light beam projected by the first projecting means and outputting the first light receiving signal and the second projecting means project the light. A second light receiving means for receiving the received light beam and outputting a second light receiving signal; a third light receiving means for receiving light from the light emitting input means and outputting a third light receiving signal; and a non-light emitting input means Coordinate detection means for detecting the coordinates of the light emission input means based on the third light reception signal, and detecting the coordinates of the light emission input means based on the third light reception signal. And

  According to the present invention, the coordinates of the light emission input means and the plurality of non-light emission input means can be detected respectively.

It is a perspective view which shows the external appearance of the electronic information board which concerns on embodiment of this invention. It is a block diagram which shows the hardware constitutions of the same electronic information board. It is a figure which shows the structure of the same electronic information board typically. It is a block diagram which shows the control system of the same electronic information board. It is a schematic diagram which shows the structure of the coordinate detection apparatus used for the electronic information board. It is a block diagram which shows the structure of the controller of the same electronic information board. It is a graph which shows the light reception state of the 3rd light-receiving means of a coordinate detection apparatus. It is a schematic diagram which shows the state which acquires the coordinate of a finger | toe with a coordinate detection apparatus. It is a graph which shows the detection state of the 1st and 2nd light-receiving means in a coordinate detection apparatus. It is a schematic diagram which shows the state of the coordinate detection apparatus using a some finger | toe. It is a schematic diagram which shows the malfunction of the coordinate detection apparatus using a some finger. It is a flowchart which shows the acquisition procedure of the coordinate at the time of using a several finger | toe. It is a figure which shows the light reception state of the 1st light receiving element in the state shown in FIG. It is a flowchart which shows the acquisition procedure of the coordinate which concerns on 2nd Embodiment. It is a schematic diagram which shows the malfunction of the coordinate detection apparatus using a some finger. It is a schematic diagram which shows the interruption | blocking state of the light in the coordinate detection apparatus using the said several finger | toe. It is a flowchart which shows the acquisition procedure of the coordinate which concerns on 3rd Embodiment. It is a schematic diagram which shows the interruption | blocking state of the light in the coordinate detection apparatus using a some finger | toe. It is a schematic diagram which shows the detection of the contact coordinate at the time of using the pen-shaped input device and the finger | toe in the coordinate detection apparatus which concerns on 4th Embodiment. It is a figure which shows the light detection state of the 1st light receiving element in the state shown in FIG. It is a figure which shows the light detection state of the 2nd, 3rd light receiving element in the state shown in FIG.

<First Embodiment>
A coordinate detection device and an electronic information board according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing an external appearance of an electronic information board according to an embodiment of the present invention. As shown in FIG. 1, an electronic information board 10 according to an embodiment of the present invention includes a display 20 that is an image display device, a stand 40 that holds the display 20 in an upright state, and a device that drives the display 20. And a device storage section 50 for storage.
The display 20 is a liquid crystal panel, a plasma panel, or the like and forms a panel member. Further, a display surface 22 for displaying an image is formed on the front surface of the housing of the display 20, and a touch panel 24 that is a coordinate detection device is disposed on the display surface 22.
Furthermore, the electronic information board 10 can write characters, figures, and the like on the display surface 22 with the pen-type input device 100 which is a dedicated light emission input means. The pen-type input device 100 includes contact detection means on the pen tip 100A, detects that the pen tip 100A has touched the display surface 22, and transmits a writing detection signal as a wireless signal. When the display 20 receives the handwriting detection signal transmitted from the pen-type input device 100, the display 20 displays characters, figures, and the like written at the coordinate positions detected by the touch panel 24.

The pen bottom 100B of the pen-type input device 100 is also provided with contact detection means, and when the pen bottom 100B touches the display surface 22, an erasure detection signal is transmitted as a radio signal. When the display 20 receives the erasure detection signal transmitted from the pen-type input device 100, the display 20 erases characters, graphics, and the like written at the coordinate position detected by the touch panel 24 from the display surface 22. As the display process by the erasing operation, a display process in which the detected coordinate position is the same color as the background (for example, white) is performed in the controller 60 (see FIGS. 3 and 4) which is a display control device. .
Furthermore, the pen-type input device 100 incorporates a booster circuit between the driving battery and the light emitting element, so that the light emission amount is always controlled to be constant, and when the remaining battery level becomes a predetermined value or less. I try not to emit light. The pen-type input device 100 includes a pressure sensor that detects a contact force to the display surface 22 and can change the intensity of light based on a detection value of the pressure sensor. The controller 60 changes the thickness of the writing line on the display surface 22 based on the intensity of the light.
The device storage unit 50 stores various devices such as a controller, a printer, and a video disk device, which will be described later. A keyboard 30 for performing an input operation is mounted on the upper surface of the device storage unit 50.

  FIG. 2 is a block diagram showing the hardware configuration of the electronic information board. As shown in FIG. 2, the electronic information board 10 includes a display 20, a touch panel 24, a keyboard 30, a CPU (Central Processing Unit) 701, a ROM (Read Only Memory) 702, a RAM (Random Access Memory) 703, An HDD (Hard Disc Drive) 704, an HDC (Hard Disk Controller) 705, a media drive 707, an interface (I / F) 708, a mouse 709, a microphone 710, a speaker 711, and a GPU (Graphics Processing Unit) 712 are connected via an expansion bus line 720. Connected and configured.

  The CPU 701 controls the overall operation of the electronic information board 10. The ROM 702 stores a program used for driving the CPU 701 such as IPL. The RAM 703 is used as a work area for the CPU 701. The HDD 704 stores various data such as programs. The HDC 705 controls reading or writing of various data with respect to the HDD 704 according to the control of the CPU 701. The media drive 707 controls reading or writing (storage) of data with respect to a recording medium 706 such as a flash memory. The I / F 708 performs data transmission and dongle connection via a communication network. The GPU 712 is connected to a ROM 713 storing a program used for driving the GPU 712 and a RAM 714 used as a work area of the GPU 712. The extended bus line 720 includes an address bus, a data bus, and the like for electrically connecting the above components.

  FIG. 3 is a diagram schematically showing the configuration of the electronic information board, and FIG. 4 is a block diagram showing a control system of the electronic information board. The display 20 is controlled by the controller 60 and displays on the display surface 22 images captured from various screen operation units 26 and user PCs (Personal Computers) 90 that are input. The controller 60 includes a USB socket 72 to which a USB (Universal Serial Bus) cable 70 is connected and an input socket 82 to which a VGA (Video Graphics Array) cable 80 is connected. In the example shown in FIGS. 3 and 4, the input socket 82 corresponds to the VGA cable. However, the input socket 82 is compatible with other standards such as HDMI (High-Definition Multimedia Interface) and DisplayPort. The input cable can be connected.

  The user PC 90 has a storage 94 composed of a magnetic disk device or the like. The storage 94 stores programs such as various contents and content display application software. Then, the operator selects the desired content from the content stored in the storage 94 to display the content on the monitor 92. Therefore, when the image data displayed on the monitor 92 of the user PC 90 is transferred via the USB cable 70 and the VGA cable 80, the controller 60 displays the image data displayed on the user PC screen 28 of the display 20 on the monitor 92. The same image as is displayed.

  The controller 60 is also connected to a network 204 such as the Internet or a LAN (Local Area Network) via a communication line 201 such as an optical fiber and a network socket 202.

FIG. 5 is a block diagram showing the configuration of the controller of the electronic information board. The controller 60 of the electronic information board 10 includes a pen signal receiving unit 210, a controller operation system unit 220, an application unit 230, a video input device unit 240, and a touch panel driver unit 250. The application unit 230 includes an event signal determination unit 231, a video input processing unit 232, an image drawing processing unit 234, a screen deletion processing unit 236, and a screen operation processing unit 238.
The controller operation system unit 220 is a main control unit that manages and executes control processing performed by the controller 60. The application unit 230 performs a control process for generating the entire image displayed on the display surface 22 of the display 20 and a control process for displaying on the user PC screen 28. In addition, the controller operation system unit 220 detects the writing detection signal when the pen tip 100 </ b> A or the pen bottom 100 </ b> B of the pen-type input device 100 is in contact with the display surface 22, and when a non-luminous material such as a finger is detected. In addition, a control process for displaying a written figure or character is performed.

The event signal determination unit 231 monitors an event signal input from the controller operation system unit 220 and performs control processing according to the input event signal.
The video input processing unit 232 performs control processing for displaying an image input from the user PC 90 on the user PC screen 28 of the display surface 22 of the display 20. The image drawing processing unit 234 generates a handwritten graphic (image) based on the coordinate data of the coordinate position input from the touch panel 24 via the event signal determination unit 231. Further, the image drawing processing unit 234 superimposes a handwritten graphic on the already displayed image and displays it on the display surface 22 of the display 20. The screen erasure processing unit 236 generates a graphic with the background color of the currently displayed image based on the coordinate position information input from the touch panel 24 via the event signal determination unit 231, and adds the background to the already displayed image. The color graphic is superimposed and displayed on the display surface 22 of the display 20.

  As a result, the background color graphic is superimposed on the handwritten graphic displayed on the display 20 and apparently erased from the display surface 22. The screen operation processing unit 238 converts coordinate position information (signal) input from the touch panel 24 into a pointing device signal such as a mouse event, and turns on / off the screen operation unit 26 displayed on the display surface 22 of the display 20. Process by operation. In addition, information on the coordinate position touched by the pen-shaped input device 100 detected by the light receiving units 300 and 310 of the touch panel 24 is transmitted to the controller operation system unit 220 together with the coordinate value as a mouse down event. Further, when the pen-type input device 100 is moved while being in contact with the display surface 22 of the touch panel 24, it is transmitted to the controller operation system unit 220 together with the coordinate value as a mouse move event.

  The coordinate detection unit 350 detects, as coordinate detection means, contact coordinates on the display surface 22 of the display 20 of the finger 200 which is a non-light emission input means other than the pen-type input device 100 and the light emission input means. That is, to the coordinate detection unit 350, a light receiving sensor 430 that is a first light receiving unit, a light receiving sensor 440 that is a second light receiving unit, and light receiving units 300 and 310 that are third light receiving units are connected. The coordinate detection unit 350 detects a coordinate position signal that is a contact coordinate on the display surface 22 of the pen-shaped input device 100 and a non-light-emitting input unit such as a finger. The light emission control unit 360 is connected to the light emitting unit 410 serving as the first projecting unit and the light emitting unit 420 serving as the second projecting unit, and drives the light emitting units 410 and 420.

  The touch panel driver unit 250 converts the coordinate position signal and the writing detection signal or the erasure detection signal input from the pen signal reception unit 210 and the coordinate detection unit 350 into predetermined event signals and transmits them to the controller operation system unit 220. When the pen signal receiving unit 210 receives a writing detection signal or an erasure detection signal from the pen-type input device 100, the touch panel driver unit 250 transmits the writing detection signal or the erasure detection signal together with the coordinate position signal to the controller operation system unit 220. To do.

Next, the arrangement of the light receiving units 300 and 310, the light emitting units 410 and 420, and the light receiving sensors 430 and 440 in the touch panel 24 will be described. FIG. 6 is a schematic diagram showing the structure of a coordinate detection device used for the electronic information board. In the touch panel 24, a pair of light receiving units 300 and 310 are arranged on the left and right corners on the upper side of the display surface 22. The light receiving units 300 and 310 are spaced apart. A light emitting unit 410 is disposed at the lower end of the display surface 22, and a light emitting unit 420 is disposed at the right end of the display surface 22. Further, a light receiving sensor 430 as a first light receiving means is disposed at the upper end portion of the display surface 22, and a light receiving sensor 440 as a second light receiving means is disposed at the left end portion of the display surface 22.
The light receiving units 300 and 310 are configured to include an imaging element such as a charge-coupled device (CCD) image sensor, a complementary metal oxide semiconductor (CMOS) image sensor, and an imaging lens.
Light emission of the light emitting units 410 and 420 is controlled by the light emission control unit 360. Outputs from the light receiving units 300 and 310, the light receiving sensor 430, and the light receiving sensor 440 are input to a coordinate detection unit 350 serving as coordinate detection means, and the detected coordinates of the pen-type input device 100 are detected.

  Next, the operation of the coordinate detection unit 350 will be described. First, detection of contact coordinates of the pen-type input device 100 that is a light emission input unit will be described. When the tip of the pen-type input device 100 comes into contact with the display surface 22, the pen tip 100A emits light. The light emitting means is composed of, for example, an infrared LED.

Infrared light emitted from the pen-type input device 100 is detected by the light receiving units 300 and 310. FIG. 7 is a graph showing the light receiving state of the third light receiving means of the coordinate detecting device. In the figure, (a) is a graph showing a light receiving signal of the light receiving unit 300, and (b) is a light receiving signal of the light receiving unit 310. These third light reception signals are input to the coordinate detection unit 350 from the light receiving units 300 and 310. The coordinate detection unit 350 detects the inclination angle (α, β in FIG. 6) of the location where the infrared light is detected with respect to the horizontal direction, calculates the contact coordinates based on the triangulation method, and converts them into XY coordinates. .
The coordinate position signal obtained by the coordinate detection unit 350 is transmitted to the image drawing processing unit 234, the screen erasing processing unit 236, and the screen operation processing unit 238 via the controller operation system unit 220.

Next, detection of contact coordinates of the finger 200 as a non-light emitting input unit will be described. When the light beam from the light emitting units 410 and 420 is received by the light receiving sensors 430 and 440 and the finger 200 comes into contact with the display surface 22, the light beam from the light emitting units 410 and 420 is blocked by the finger 200. The light receiving sensors 430 and 440 detect this state. Based on the first light receiving signal and the second light receiving signal from the light receiving sensors 430 and 440, the coordinate detecting unit 350 detects the contact coordinates of the finger 200 on the display surface 22.
FIG. 8 is a schematic diagram showing a state in which the coordinates of the finger are acquired by the coordinate detection device. A plurality of light sources 510 composed of infrared LEDs (Light Emitting Diodes) or the like are disposed in the light emitting units 410 and 420.
N light sources 510 of the light emitting unit 410 are arranged corresponding to the display range of the display surface 22 in the horizontal direction (X direction). Each light source 510 projects a light beam in the Y direction (first direction) along the surface of the display surface 22. That is, the light emitting unit 410 projects a plurality of light beams in a row along the Y direction.
M light sources 510 of the light emitting unit 420 are arranged corresponding to the display range in the vertical direction (Y direction) of the display surface 22. Each light source 510 projects a light beam along the surface of the display surface 22 in the X direction (second direction intersecting the first direction). That is, the light emitting unit 420 projects a plurality of light beams in a row along the X direction.
The light emission control unit 360 sequentially scans and lights the light source 510 of the light emitting unit 410 in the direction of the arrow X in the drawing, and sequentially scans and lights up the light source 510 of the light emitting unit 420 in the direction of the arrow Y in the drawing.

  The light receiving sensors 430 and 440 are each provided with a plurality of light receiving elements 520 made of, for example, photodiodes. The same number N of light receiving elements 520 of the light receiving sensor 430 as the pair with the light sources 510 of the light emitting unit 410 are disposed in the display range of the display surface 22 in the horizontal direction (X direction). The same number M of light receiving elements 520 of the light receiving sensor 440 as the pair with the light sources 510 of the light emitting unit 420 are arranged in the display range in the vertical direction (Y direction) of the display surface 22.

  As shown in FIG. 8, when the coordinates (2, 3) of the display surface 22 are touched, the infrared light of the light source 510 a of the light emitting unit 410 is blocked by the finger 200 and is second in the X arrow direction of the light receiving sensor 430. The light receiving element 520a cannot receive light. Further, the infrared light of the third light source 510b of the light emitting unit 420 is blocked by the finger 200 and cannot be received by the third light receiving element 520b of the light receiving sensor 440 in the Y arrow direction.

  FIG. 9 shows the light receiving state of the light receiving sensor 430 when the light source 510a emits light and the light receiving state of the light receiving sensor 440 when the light source 510b emits light in the example shown in FIG. As shown in FIG. 9, the amount of light received by the light receiving element having the X direction coordinate “2” and the light receiving element having the Y direction coordinate “3” is decreased. The coordinate detection unit 350 can detect the contact coordinates (2, 3) of the finger 200 from this state. Since the detection accuracy of the image depends on the light receiving element interval, it is inferior to the triangulation method. However, since the input other than the pen-type input device 100 is used for enlargement / reduction of the image display surface, slide, or the like, Even if the coordinate detection accuracy is inferior to the writing accuracy by, no problem occurs.

Next, a case where a plurality of fingers 200 are in contact with the display surface 22 will be described. FIG. 10 is a schematic diagram showing a state of the coordinate detection device using a plurality of fingers, and FIG. 11 is a schematic diagram showing a defect of the coordinate detection device using a plurality of fingers. As shown in FIG. 10, the state where the finger 200A touches the coordinates (2, 3) and 200B touches the coordinates (5, 4) on the display surface 22 will be examined.
Since the finger 200A blocks the infrared light from the light source 510a on the second surface of the light emitting unit 410, the second light receiving element 520a of the light receiving sensor 430 cannot receive the infrared light. In addition, since the finger 200A blocks infrared light from the third light source 510b of the light emitting unit 420, the third light receiving element 520b of the light receiving sensor 440 cannot receive infrared light.
Similarly, since the finger 200B blocks the infrared light from the light source 510c on the fifth surface of the light emitting unit 410, the fifth light receiving element 520c of the light receiving sensor 430 cannot receive the infrared light. Moreover, since the finger 200B blocks infrared light from the fourth light source 510d of the light emitting unit 420, the fourth light receiving element 520d of the light receiving sensor 440 cannot receive infrared light. As described above, it is possible to actually detect the two contact coordinates (2, 3) and (5, 4) of the finger 200A and the finger 200B.
However, from this information alone, not only the coordinates (2, 3) and (5, 4) but also the coordinates (2, 4) and the coordinates (5, 3) of the position 610 shown in FIG. Candidate for

In the present embodiment, the coordinate detection unit 350 compares the received light amounts of the surrounding elements of the light receiving element to determine the distance to the light receiving element and determines the contact coordinates of the two fingers. FIG. 12 is a flowchart illustrating a procedure for acquiring coordinates when a plurality of fingers are used.
First, the coordinate detector 350 determines whether there are two coordinates detected by the light receiving sensor 430 (step S1). If there are two detected coordinates (Yes in step S1), the coordinate detection unit 350 determines whether there are two coordinates detected by the light receiving sensor 440 (step S2).
When one point is detected in step S1 (No in step S1), the coordinate detection unit 350 further determines whether there are two coordinates detected by the light receiving sensor 440 (step S6).

  In the case of Yes in step S1 and Yes in step S2, the process proceeds to the process of determining the coordinates of two points after step S3. On the other hand, if either step S1 or step S2 is No, the coordinates are uniformly determined at two points, so the coordinates of the two points are detected (step S7), and the process ends. When both step S1 and step S2 are No, since only one coordinate is detected, this coordinate is detected (step S8) and the process ends.

If both Step S1 and Step S2 are Yes, the following processing is performed. First, the amounts of light around the two coordinates detected by the light receiving sensor 430 are compared (step S3).
Next, of the two coordinates detected by the light receiving sensor 430, a coordinate having a low peripheral light amount (X coordinate) and a coordinate far from the light receiving sensor 430 (Y coordinate) among the coordinates detected by the light receiving sensor 440 are combined. Thereby, one contact coordinate is determined.
Further, a coordinate having a high peripheral light amount (X coordinate) detected by the light receiving sensor 430 and a coordinate (Y coordinate) close to the light receiving sensor 430 detected by the light receiving sensor 440 among the two coordinates detected by the light receiving sensor 440 are combined ( Step S5). This establishes two coordinates.

The processing of step S3 and step S4 will be specifically described. First, step S3 will be described. FIG. 13 is a view showing a light receiving state of the first light receiving element in the state shown in FIG. This figure shows the light reception signal of the light reception sensor 430 when the finger 200B blocks the light emission of the light source 510c.
The signal shown in this figure is the signal of the light receiving sensor 430 (pixel numbers 4 and 6) around the contacted X coordinate “5” as compared with FIG. 9A showing the signal blocked by the finger 200A when the light source 510a emits light. The received light signal is also small. This is because the distance of the finger 200B from the light receiving sensor 430 is farther from the finger 200A. Therefore, it is understood that the Y coordinate of the finger 200B located at the X coordinate “5” is “4” far from the light receiving sensor 430 among the Y coordinates “3” and “4” detected by the light receiving sensor 440.

In step S4, since the light reception signal of the light receiving sensor 430 around the X coordinate “2” is larger than the signal from the light receiving sensor 430 around the X coordinate “5”, the finger 200A among the Y coordinate candidates “3” and “4”. Is determined to be “3” on the side closer to the light receiving sensor 430. Thereby, it can be determined that the contact coordinates of the two fingers 200A and 200B are (2, 3) and (5, 4).
In this way, by comparing the amounts of light received by surrounding elements of the light receiving element, it is possible to determine the distance to the light receiving element and to prevent erroneous detection of coordinates.

  In the above embodiment, the coordinates are determined for the two fingers 200A and 200B, but the same applies to the case where three or more fingers are detected. In other words, it is determined that the smaller the number of light receiving elements whose received light amount is, the closer to the light receiving sensor 430. Thereby, the contact coordinates of three or more fingers can be determined.

Second Embodiment
Next, a determination method by the coordinate detection unit 350 according to the second embodiment will be described. FIG. 14 is a flowchart showing a coordinate acquisition procedure according to the second embodiment. In the second embodiment, the coordinate detection unit 350 determines a plurality of coordinates based on the light receiving state of the light receiving element of the light receiving sensor 430 by light from a plurality of light sources arranged at different positions in the light emitting unit 410. That is, the closer the contact coordinates to the light emitting unit 410, the larger the light receiving position variation in the light receiving sensor 430 with respect to the light emitting position variation of the light emitting unit.

First, the coordinate detection unit 350 determines whether there are two coordinates detected by the light receiving sensor 430 (step S11). When there are two detected coordinates (X coordinates “m” and “n”, where m and n are natural numbers) (Yes in step S11), the coordinate detection unit 350 detects the coordinates detected by the light receiving sensor 440. It is determined whether there are two points (step S12).
If one point is detected in step S11 (No in step S11), the coordinate detection unit 350 further determines whether there are two coordinates detected by the light receiving sensor 440 (step S20).

  In the case of Yes in step S11 and Yes in step S12, the process proceeds to the process of determining the coordinates of two points after step S13. If either step S11 or step S12 is No, the coordinates are uniformly determined at two points, so the two points are detected (step S21) and the process ends. When both step S11 and step S12 are No, only one point has been detected, and this coordinate is detected (step S22), and the process ends.

Next, the coordinate detection unit 350 detects a portion where the light amount of the light receiving sensor 430 has decreased when the “n + 1” light source of the light emitting unit 410 emits light. It is assumed that this is the “n−ξ” -th (step S13).
Further, the coordinate detection unit 350 detects a portion where the light amount of the light receiving sensor 430 has decreased when the “m + 1” th light source of the light emitting unit 410 emits light. It is assumed that this is the “m−η” -th (step S14).
Then, the coordinate detection unit 350 compares “ξ” with “η” (step S15).
As a result of the comparison in step S15, if “ξ> η” (Yes in S15), the coordinate far from the light receiving sensor 430 among the X coordinate “n” and the two Y coordinates detected by the light receiving sensor 440 is set. The first contact coordinate is combined (step S16). Further, the X coordinate “m” and the two Y coordinates detected by the light receiving sensor 440 are combined with the coordinates closer to the light receiving sensor 430 as the second contact coordinates (step S17).
When “ξ ≦ η” is satisfied (No in S15), the first coordinate is obtained by combining the X coordinate “m” and the two Y coordinates detected by the light receiving sensor 440 that are farther from the light receiving sensor 430. The contact coordinates are set (step S18). Furthermore, the X coordinate “n” and the two Y coordinates detected by the light receiving sensor 440 are combined with the coordinates closer to the light receiving sensor 430 to form the second contact coordinate (step S19). This establishes two coordinates.

  The process described above will be specifically described. FIG. 15 is a schematic diagram showing a defect of the coordinate detection device using a plurality of fingers, and FIG. 16 is a schematic diagram showing a light blocking state in the coordinate detection device using a plurality of fingers. 15 and 16, the number of light sources 510 in the light emitting units 410 and 420 and the number of light receiving elements 520 in the light receiving sensors 430 and 440 are each eight. In FIG. 15, the contact point 630 is coordinates (2, 3), and the contact point 640 is coordinates (6, 6). However, with this alone, coordinates (6, 3) and coordinates (2, 6) indicated by reference numerals 650 and 660 are also candidates for contact coordinates.

In this case, as shown in FIG. 16, the coordinate detection unit 350 detects “2” as “coordinate m” in the X direction and “6” as “coordinate n” in step S11. Therefore, in step S15, the coordinate detection unit 350 calculates “ξ” and “η” in a state where light is emitted from the light source 510e of the light emitting unit 410 in the X direction (m + 1) = 3 and the light source 510f of (n + 1) = 7. Compare. Here, ξ and η are natural numbers. Note that the value added to “m” and “n” is not limited to “1”, but can be set according to the state of detection such as “2” and “3”.
In the example shown in FIG. 16, since “η” is “1”, “ξ” is “2”, and ξ> η, the coordinate detection unit 350 performs the coordinates of the contact point 630 according to Steps S16 and S17. (2, 3) and the coordinates (6, 6) of the contact point 640 are determined.
As described above, in the present embodiment, it is possible to determine the distance to the light source and prevent erroneous detection of coordinates.

  In the above embodiment, coordinates are determined for two fingers 200A and 200B. However, when three or more fingers are detected, values corresponding to “ξ” and “η” are acquired for a plurality of X coordinates. Then, it is determined that the value is closer to the light receiving sensor 430 in the descending order of each value. Thereby, the contact coordinates of three or more fingers can be determined.

<Third Embodiment>
Next, a coordinate determination method by the coordinate detection unit 350 according to the third embodiment will be described. FIG. 17 is a flowchart illustrating a coordinate acquisition procedure according to the third embodiment, and FIG. 18 is a schematic diagram illustrating a light blocking state in a coordinate detection apparatus using a plurality of fingers. In the third embodiment, the coordinate detection unit 350 determines a plurality of coordinates based on the light receiving state of the light receiving element of the light receiving sensor 430 by the light from the plurality of light sources 510 arranged at different positions in the light emitting unit 410. That is, in the third embodiment, the closer the contact coordinates are to the light emitting unit, the larger the change in the light receiving angle of the light receiving sensor with respect to the light emission position variation of the light emitting unit.

First, the coordinate detector 350 determines whether there are two coordinates detected by the light receiving sensor 430 (step S31). When there are two detected coordinates (X coordinates “m”, “n”) (Yes in step S31), the coordinate detection unit 350 determines whether there are two coordinates detected by the light receiving sensor 440 (step S32). ).
If one point is detected in step S11 (No in step S31), the coordinate detection unit 350 further determines whether there are two coordinates detected by the light receiving sensor 440 (step S40).

  In the case of Yes in step S31 and Yes in step S32, the process proceeds to the process of determining the coordinates of two points after step S23. If any of Step S31 and Step S32 is No, the coordinates are uniformly determined at two points, so the coordinates of the two points are detected (Step S41), and the process ends. If both step S31 and step S32 are No, only one coordinate has been detected, and this coordinate is detected (step S42) and the process ends.

Next, the coordinate detection unit 350 detects the portion where the light amount of the light receiving sensor 430 has decreased when the “n + 1” -th light source of the light-emitting unit 410 emits light. Is obtained by Equation 1 (step S33). Here, ξ is a natural number.
ε1 = arctan (L2 * (ξ + 1) / L1) (1)
Here, L1 is the distance between the light source 510 and the light receiving element 520, and L2 is the pitch of each light receiving element 520 in the light receiving sensor 430 (see FIG. 18).

Further, the coordinate detection unit 350 detects a portion where the light amount of the light receiving sensor 430 is reduced when the “m + 1” th light source of the light emitting unit 410 emits light, and this is regarded as the “m−η” th, and the angle ε2 is set. It calculates | requires by Formula 2 (step S34). Here, η is a natural number.
ε2 = arctan (L2 * (η + 1) / L1) (2)
Here, L1 and L2 are the same as in Equation 1.

Further, the coordinate detection unit 350 compares “ε1” with “ε2” (step S35).
As a result of the comparison in step S15, if “ε1> ε2” (Yes in S35), the X coordinate “n” and the coordinate farther from the light receiving sensor 430 out of the two Y coordinates detected by the light receiving sensor 440 are set. The first contact coordinate is combined (step S36). Further, the X coordinate “m” and the two Y coordinates detected by the light receiving sensor 440 are combined with the coordinates closer to the light receiving sensor 430 as the second contact coordinates (step S37).
If “ε1 ≦ ε2” (No in S35), the X coordinate “m” and the two Y coordinates detected by the light receiving sensor 440 are combined with the coordinate farthest from the light receiving sensor 430. The contact coordinates are set (step S38). Furthermore, the X coordinate “n” and the two Y coordinates detected by the light receiving sensor 440 are combined with the coordinates closer to the light receiving sensor 430 as the second contact coordinates (step S39). This establishes two coordinates.

  The process described above will be specifically described with reference to FIG. In order to simplify the description, in FIG. 18, the number of light sources 510 in the light emitting units 410 and 420 and the number of light receiving elements 520 in the light receiving sensors 430 and 440 are each eight. In FIG. 18, the contact point 630 of the finger 200A is the coordinates (2, 3), and the contact point 640 of the finger 200B is the coordinates (6, 6). However, with this alone, coordinates (6, 3) and coordinates (2, 6) indicated by reference numerals 650 and 660 are also candidates for contact coordinates.

In this case, as shown in FIG. 16, the coordinate detecting unit 350 detects “2” as “coordinate m” and “6” as “coordinate n” in step S11. Therefore, in step S15, the coordinate detection unit 350 causes the light emitting unit 410 to emit light with the light source 510e in the X direction (m + 1) = 3 and the light source 510f with (n + 1) = 7, and the angle “ε1”. Is obtained (step S33, step S34). Note that the value added to “m” and “n” is not limited to “1”, but can be set according to the state of detection such as “2” and “3”.
Next, the coordinate detection unit 350 compares “ε1” with “ε2” in step S35.
In the example shown in FIG. 18, since ε1> ε2, the coordinate detection unit 350 determines the coordinates (2, 3) of the contact point 630 and the coordinates (6, 6) of the contact point 640 according to Steps S36 and S37. Determine.
As described above, in the present embodiment, it is possible to determine the distance to the light source and prevent erroneous detection of coordinates.

  In the above embodiment, the coordinates are determined for the two fingers 200A and 200B. However, when three or more fingers are detected, angles corresponding to “ε1” and “ε2” are acquired for a plurality of X coordinates. Then, it is determined that the distance from the light receiving sensor 430 is larger in order of the respective values. Thereby, the contact coordinates of three or more fingers can be determined.

<Fourth embodiment>
Next, a determination method by the coordinate detection unit 350 according to the fourth embodiment will be described. In the present embodiment, erroneous detection of the pen-type input device 100 and the finger 200 is prevented. FIG. 19 is a schematic diagram illustrating detection of contact coordinates when a pen-type input device and a finger are used in the coordinate detection device according to the fourth embodiment. 20 is a diagram showing a light detection state of the first light receiving element in the state shown in FIG. 19, and FIG. 21 is a diagram of the second light receiving element and the third light receiving element in the state shown in FIG. It is a figure which shows a light detection state.
As shown in FIG. 19, when the tip of the pen-type input device 100 comes into contact with the display surface 22 and the pen tip 100A of the pen-type input device 100 emits light, infrared light from the pen-type input device 100 is received. Detected by the units 300 and 310. Further, when the finger 200 comes into contact with the display surface 22, infrared light from the light emitting units 410 and 420 detected by the light receiving units 300 and 310 is blocked.

First, detection of the pen-type input device 100 by the light receiving units 300 and 310 will be described. In this state, when the pen tip 100A of the pen-type input device 100 emits light, the light receiving units 300 and 310 receive the amount of received light by the infrared rays from the pen-type input device 100 at the angles α and β as shown in FIG. It has increased. Further, at the angles γ and δ, the amount of received light is reduced by the infrared rays being blocked by the finger 200.
However, since the contact coordinates of the pen-type input device 100 are detected by detecting an increase in the amount of received light, basically the coordinate position of the finger 200 is not erroneously detected as a pen-type input device.

  In the present embodiment, in order to further prevent erroneous detection of the infrared ray blocking by the finger 200 from the pen-type input device 100, the wavelength of infrared rays emitted from the pen-type input device 100 and the wavelength of infrared rays emitted from the light emitting units 410 and 420 are further reduced. Are different. And the filter which interrupts | blocks the wavelength of the infrared rays inject | emitted from the light emission part 410,420 is attached to the light-receiving surface of the light-receiving part 300,310. Thereby, the light-receiving units 300 and 310 can prevent the influence of the change in the amount of light received from the light-emitting units 410 and 420 due to finger blocking.

  For example, the infrared wavelength from the pen-type input device 100 is 900 nm, and the infrared wavelengths of the light emitting units 410 and 420 are 800 nm. And the filter which does not permeate | transmit light with a wavelength of 850 nm or less is attached to the light-receiving part of the light-receiving part 300,310. Thereby, the light-receiving units 300 and 310 can prevent the influence of the change in the amount of light received from the light-emitting units 410 and 420 due to finger blocking.

  Next, prevention of erroneous detection by the light receiving sensors 430 and 440 will be described. FIG. 21 shows a light receiving state of the light receiving sensor 440 when the light source 510e shown in FIG. 19 emits light and a light receiving state of the light receiving sensor 430 when the light source 510f emits light. Although the infrared light from the light sources 510e and 510f is blocked by the pen-type input device 100, the amount of light received by the corresponding light-receiving elements 520d and 520a is not reduced by the light emission of the pen-type input device 100. Thereby, the pen-type input device 100 is not erroneously detected as a finger or the like. In this case, it is desirable that the amount of infrared light emitted from the pen-type input device 100 is larger than the amount of infrared light emitted from the light emitting units 410 and 420. In addition, the pen-type input device 100 can identify a plurality of pens by transmitting a pen identification signal as a wireless signal to the pen signal receiving unit 210 of the controller 60.

<Configuration, operation and effect of exemplary embodiment of the present invention>
<First aspect>
The present embodiment includes a light receiving sensor 430 that receives a light beam projected by the light emitting unit 410 and outputs a first light receiving signal, and a light receiving sensor 440 that receives the light beam projected by the light emitting unit 420 and outputs a second light receiving signal. , Receiving light from the pen-type input device 100 and outputting a third light receiving signal, and detecting the coordinates of the finger 200 based on the first light receiving signal and the second light receiving signal, A coordinate detection unit 350 that detects the coordinates of the pen-type input device 100 based on a third light reception signal.
According to this aspect, the light receiving sensor 430, 440 detects the shielding state of the light flux from the light emitting units 410, 420 by the finger 200, the light receiving units 300, 310 detect the light emission of the pen-type input device 100, and the coordinate detecting unit At 350, each coordinate is detected. Thereby, the coordinates of the pen-shaped input device 100 and the plurality of fingers 200 can be detected.

<Second aspect>
In this aspect, the light emission amount of the pen-type input device 100 is larger than the light emission amounts of the light emitting units 410 and 420.
In this embodiment, the pen-type input device 100 has a light emission amount larger than that of the light emitting units 410 and 420. Thereby, it is possible to prevent the pen-type input device 100 from being erroneously detected by the light receiving sensors 430 and 440.

<Third aspect>
In this aspect, each of the light emitting units 410 and 420 includes a plurality of light sources 510 that output each light beam, and projects the light beams by sequentially scanning and lighting the light sources 510.
According to this aspect, the light sources 510 of the light emitting units 410 and 420 are sequentially scanned and lit, and the light beams that are scanned and lit are detected by the light receiving sensors 430 and 440. Thereby, the coordinate detection unit 350 can detect the coordinates of the light beam from each light source 510 blocked by the finger 200.

<4th aspect>
In this embodiment, the light receiving sensors 430 and 440 have the same number of light receiving elements 520 that are paired with the plurality of light sources 510 of the light emitting units 410 and 420, and the coordinate detecting unit 350 is the light receiving elements 520 of the light receiving sensors 430 and 440. The coordinates of the finger 200 are detected based on the received light amount, and the distance between the light receiving sensor 430 and the finger 200 is determined based on the variation in the received light amount of the light receiving element 520 when a plurality of fingers 200 are detected. And
According to this aspect, the coordinate detection unit 350 determines the distance from the light receiving sensor 430 based on the variation in the amount of light received by the light receiving element 520 by the plurality of fingers 200 detected. Thereby, the coordinates of each of the plurality of fingers 200 can be determined.

<5th aspect>
In this embodiment, the light receiving sensors 430 and 440 have the same number of light receiving elements 520 that are paired with the plurality of light sources 510 of the light emitting units 410 and 420, and the coordinate detecting unit 350 detects the plurality of fingers 200 and emits the light emitting unit. The distance between the light emitting unit 410 and the finger 200 is determined based on the light receiving state of the light receiving element 520 of the light receiving sensor 430 by the light from the light source 510 arranged at different positions 410.
According to this aspect, the coordinate detection unit 350 determines the distance from the light receiving sensor 430 based on the variation in the amount of light received by the light receiving element 520 by the finger 200 detected by light from different light emitting elements. Thereby, the coordinates of each of the plurality of fingers 200 can be determined.

<Sixth aspect>
In this embodiment, the wavelength of light generated by the light emitting units 410 and 420 is different from the wavelength of light generated by the pen-type input device 100, and the light beams from the light emitting units 410 and 420 are transmitted through the light receiving units 300 and 310. It is characterized by providing a filter that does not.
According to this aspect, the light receiving units 300 and 310 do not detect light from the light emitting units 410 and 420. Thereby, erroneous detection of the finger 200 by the light receiving units 300 and 310 can be prevented.

<Seventh aspect>
The electronic information board 10 according to this aspect includes a display 20 having a display surface 22, a touch panel 24, and an application unit 230 that causes an image display device to display an image generated based on coordinate data output from the touch panel 24. It is characterized by that.
According to this aspect, the coordinates of the pen-type input device 100 and the finger 200 are detected by the light receiving units 300 and 310, the light emitting units 410 and 420, the light receiving sensors 430 and 440, and the coordinate detecting unit 350 arranged on the touch panel 24. Can be displayed by the application unit 230. Thereby, the electronic information board 10 which can detect the pen-shaped input device 100 and the plurality of fingers 200 can be realized.

10: Electronic information board, 20: Display, 22: Display surface (panel member), 24: Touch panel (coordinate detection device), 100: Pen-type input device (light emission input means), 200, 200A, 200B: Finger (non-light emission) (Input means), 300, 310: light receiving part (third light receiving means), 350: coordinate detection part (coordinate detection means), 360: light emission control part, 410: light emission part (first projection means), 420: light emission 430: light receiving sensor (first light receiving means), 440: light receiving sensor (second light receiving means), 510: light source, 520: light receiving element

JP 2013-175142 A

Claims (7)

A first light receiving means for receiving a light beam projected by the first projection means and outputting a first light reception signal;
A second light receiving means for receiving a light beam projected by the second projection means and outputting a second light reception signal;
A third light receiving means for receiving light from the light emitting input means and outputting a third light receiving signal;
A coordinate detecting means for detecting coordinates of the non-light emitting input means based on the first light receiving signal and the second light receiving signal, and detecting coordinates of the light emitting input means based on the third light receiving signal; A coordinate detection device comprising:   The coordinate detection apparatus according to claim 1, wherein a light emission amount of the light emission input unit is larger than a light emission amount of the first projection unit and the second projection unit.   The first projection unit and the second projection unit each include a plurality of light sources that output the light beams, and sequentially scan and light the plurality of light sources to project the light beams. The coordinate detection apparatus according to claim 1 or 2. The first light receiving means and the second light receiving means have the same number of light receiving elements that are paired with a plurality of light sources of the first projection means and the second projection means,
The coordinate detection means includes
While detecting the coordinates of the non-light emitting input means based on the amount of light received by each light receiving element of the first light receiving means and the second light receiving means,
The distance between the light receiving means and the non-light emitting input means is determined based on the amount of light received by the light receiving element when a plurality of the non-light emitting input means are detected. The coordinate detection device according to item. The first light receiving means and the second light receiving means have the same number of light receiving elements that are paired with a plurality of light sources of the first projection means and the second projection means,
The coordinate detection means, when detecting a plurality of the non-light emitting input means, based on the light receiving state of the light receiving element by the light from the light sources arranged at different positions of the light emitting means, the light source and the non-light emitting input means The coordinate detection device according to any one of claims 1 to 4, wherein the distance is determined.   The wavelength of the light projected by the first projecting unit and the second projecting unit is different from the wavelength of the light generated by the light emitting input unit, and the third projecting unit includes the first projecting unit. The coordinate detection apparatus according to claim 1, further comprising a filter that does not transmit the light beam from the second projection unit.   An image display device having a panel member, the coordinate detection device according to any one of claims 1 to 3, and an image generated based on the coordinate data output from the coordinate detection device is displayed on the image display device. An electronic information board comprising: a display control device for displaying.

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