JP2007206935A - Coordinate detection system, coordinate detection device, coordinate detection method and touch pen - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coordinate detection system for accurately detecting coordinates while suppressing costs. <P>SOLUTION: This coordinate detection system is provided with a touch pen for touching a coordinate input surface 101 and a coordinate detection device 100 for detecting the coordinates of a touched point. The touch pen is provided with a reflector near a contact surface in contact with the coordinate input surface 101, and the coordinate detection device 100 is provided with a first light emitting means 102A and a second light emitting means 102B arranged adjacently to the coordinate input surface 101; a first light receiving means 104A and a second light receiving means 104B arranged adjacently to the first light emitting means 102A and the second light emitting means 102B for detecting a touch point direction where light receiving intensity is higher than the other region corresponding to the reflector; and a calculation control means 105 for calculating the coordinates of the touch point based on the touch point direction detected by the first light receiving means 104A and the second light receiving means 104B. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a coordinate detection system, a coordinate detection device, a coordinate detection method, and a touch pen that detect the coordinates of a touch point on a coordinate input surface.

  2. Description of the Related Art Conventionally, touch panels capable of drawing characters and figures with a touch pen or the like are known. This is to display characters or the like drawn by the touch pen by detecting the coordinates of the touch point touched by the touch pen.

  As such a touch panel, there is known a touch panel that detects a position where reflected light from a reflector disposed around the touch panel is shielded by a touch pen as a touch point and detects the coordinates of the touch point (for example, “Patent” Reference 1 ”). Furthermore, there is also known one that can detect two or more coordinates by providing three optical units (for example, see “Patent Document 2”). Further, as a touch pen, a touch pen provided with a light emitting unit is disclosed (see, for example, “Patent Document 3”).

JP 2001-14091 A JP 2003-303046 A JP 2005-31755 A

  However, in the conventional touch panel, there is a problem that coordinates are detected even for a writer's hand, a sleeve, and even an inadvertent contact with the touch panel. Further, as described above, a touch pen provided with a light emitting unit is known as a solution to solve this problem, but a lower cost is required.

  The present invention has been made in view of the above, and an object of the present invention is to provide a coordinate detection system, a coordinate detection device, a coordinate detection method, and a touch pen that can accurately detect coordinates while suppressing cost. .

  In order to solve the above-described problems and achieve the object, the invention according to claim 1 is a coordinate detection system including a touch pen that touches the coordinate input surface and a coordinate detection device that detects the coordinates of the touched touch point. In the system, the touch pen includes a reflecting plate in the vicinity of a contact surface that contacts the coordinate input surface, and the coordinate detection device includes a first light emitting unit disposed in proximity to the coordinate input surface; A second light emitting means disposed close to the coordinate input surface and at a position different from the first light emitting means; a second light emitting means disposed close to the first light emitting means; corresponding to the reflecting plate; The first light receiving means for detecting the direction of the touch point having a higher light receiving intensity than the first light receiving means and the touch point direction having a higher light receiving intensity than the other region, disposed adjacent to the second light emitting means and corresponding to the reflector. A second light receiving means for detecting Based on the touch point direction is detected by the detected the touch point direction and the second light receiving means by the light receiving means, and having a calculation control means for calculating the coordinates of the touch point.

  The invention according to claim 2 is the coordinate detection system according to claim 1, wherein the touch pen has the reflecting plate in the vicinity of the contact surface.

  According to a third aspect of the present invention, in the coordinate detection system according to the second aspect, the touch pen has the reflecting plate around the entire touch pen in the vicinity of the contact surface.

  The invention according to claim 4 is the coordinate detection system according to any one of claims 1 to 3, wherein the coordinate detection system includes two touch pens, and each touch pen includes the reflector. And the coordinate detecting device is close to the coordinate input surface and close to the third light emitting means and a third light emitting means disposed at a position different from the first light emitting means and the second light emitting means. And a third light receiving means for detecting a touch point direction corresponding to the reflector and having a higher light receiving intensity than other areas, and the calculation control means is further detected by the third light receiving means. The coordinates of the touch point corresponding to each of two touch pens are calculated based on the touch point direction.

  The invention according to claim 5 is the coordinate detection system according to any one of claims 1 to 3, wherein the coordinate detection system includes three touch pens, and each touch pen includes the reflector. And the coordinate detecting device is close to the coordinate input surface and close to the third light emitting means and a third light emitting means disposed at a position different from the first light emitting means and the second light emitting means. And a third light receiving means for detecting a touch point direction corresponding to the reflector and having a higher light receiving intensity than other areas, and the calculation control means is further detected by the third light receiving means. The coordinates of the touch point corresponding to each of the three touch pens are calculated based on the touch point direction.

  According to a sixth aspect of the present invention, in the coordinate detection system according to the first aspect, the coordinate input surface is formed in a rectangular shape, and the first light receiving means is a predetermined one of the coordinate input surface. It is arranged in the vicinity of one end of the side, and the second light receiving means is arranged in the vicinity of the other end of the predetermined side of the coordinate input surface.

  The invention according to claim 7 is the coordinate detection system according to claim 4 or 5, wherein the coordinate input surface is formed in a rectangular shape, and the first light receiving means is provided on the coordinate input surface. The second light receiving unit is disposed in the vicinity of one end of the predetermined side, the second light receiving unit is disposed in the vicinity of the other end of the predetermined side of the coordinate input surface, and the third light receiving unit is disposed in the vicinity of the coordinate input surface. And it is arranged at a position other than the first light receiving means and the second light receiving means.

  According to an eighth aspect of the present invention, there is provided a coordinate detection device that detects a coordinate of a touch point touched by a touch pen that touches a coordinate input surface, the pen having a reflecting plate, and close to the coordinate input surface. Arranged near the coordinate input surface and at a position different from the first light emitting means, and arranged close to the first light emitting means, First light receiving means for detecting a touch point direction which is a light irradiated by the first light emitting means and the second light emitting means and reflected by the reflecting plate and having a higher light receiving intensity than other areas. Light that is disposed in the vicinity of the second light emitting means, is irradiated by the first light emitting means and the second light emitting means, and is reflected by the reflecting plate, and has a higher light receiving intensity than other regions. Touch point direction that is the direction of A second light receiving means for detecting, and a calculation control means for calculating coordinates of the touch point based on the touch point direction detected by the first light receiving means and the touch point direction detected by the second light receiving means. It is characterized by comprising.

  The invention according to claim 9 is a touch pen that touches the coordinate input surface, and is arranged close to the coordinate input surface in a coordinate detection device that detects the coordinates of a touch point touched by the touch pen. A reflector that reflects the light emitted by the first light emitting means and the light emitted by the second light emitting means disposed in a position close to the coordinate input surface and different from the first light emitting means; It is characterized by.

  The invention according to claim 10 is a coordinate detection method in a coordinate detection system including a touch pen that touches a coordinate input surface and a coordinate detection device that detects the coordinates of the touched touch point. A first irradiating step in which a first illuminating means irradiates light by a first light emitting means disposed in the vicinity of the coordinate input surface; A second irradiating step of irradiating light from a second light emitting means disposed near the coordinate input surface and at a position different from the first light emitting means; and a first irradiating step disposed close to the first light emitting means. The light receiving means detects the touch point direction of the light irradiated by the first irradiation step and the second irradiation step, which corresponds to the reflected light from the reflecting plate of the touch pen and has a higher received light intensity than other areas. The first light receiving step and the second light receiving means arranged in the vicinity of the second light emitting means reflect the light emitted by the first irradiation step and the second irradiation step by the reflecting plate of the touch pen. A second light receiving step for detecting a touch point direction corresponding to light and having a higher light receiving intensity than other regions, and the touch point direction detected in the first light receiving step and detected in the second light receiving step. A calculation control step of calculating coordinates of the touch point based on the touch point direction.

  According to the first aspect of the present invention, the touch pen has a reflecting plate in the vicinity of the contact surface that contacts the coordinate input surface, and the first light emitting means of the coordinate detection device is disposed close to the coordinate input surface, The second light emitting means is disposed close to the coordinate input surface and at a position different from the first light emitting means, the first light receiving means is disposed close to the first light emitting means, corresponds to the reflector, A touch point direction in which the received light intensity is stronger than the area is detected, and the second light receiving means is arranged close to the second light emitting means, corresponds to the reflector, and has a stronger received light intensity than other areas. The direction is detected, and the calculation control means calculates the coordinates of the touch point based on the touch point direction detected by the first light receiving means and the touch point direction detected by the second light receiving means. The effect of being able to detect the coordinates accurately To.

  According to the invention of claim 2, since the touch pen has the reflecting plate in the vicinity of the contact surface, the light irradiated by the light emitting means is reliably reflected by the reflecting plate, so that the coordinates are detected more accurately. There is an effect that can be done.

  Further, according to the invention of claim 3, since the touch pen has the reflecting plate around the touch pen in the vicinity of the contact surface, the light irradiated by the light emitting means is reliably reflected by the reflecting plate. There is an effect that coordinates can be detected more accurately.

  According to the invention of claim 4, the coordinate detection system includes two touch pens, each touch pen has a reflector, and the third light emitting unit of the coordinate detection device is close to the coordinate input surface, In addition, the third light receiving unit is disposed at a position different from the first light emitting unit and the second light emitting unit, the third light receiving unit is disposed in the vicinity of the third light emitting unit, corresponds to the reflector, and has a higher light receiving intensity than other regions. The touch point direction is detected, and the calculation control means further calculates the coordinates of the touch points corresponding to the two touch pens based on the touch point direction detected by the third light receiving means, so that a plurality of points are touched simultaneously. Even if it is a case, there exists an effect that each coordinate can be calculated correctly.

  According to the invention of claim 5, the coordinate detection system includes three touch pens, each touch pen has a reflector, and the third light emitting means of the coordinate detection device is close to the coordinate input surface, In addition, the third light receiving unit is disposed at a position different from the first light emitting unit and the second light emitting unit, the third light receiving unit is disposed in the vicinity of the third light emitting unit, corresponds to the reflector, and has a higher light receiving intensity than other regions. The touch point direction is detected, and the calculation control means further calculates the coordinates of the touch points corresponding to the three touch pens based on the touch point direction detected by the third light receiving means, so that a plurality of points are touched simultaneously. Even if it is a case, there exists an effect that each coordinate can be calculated correctly.

  According to the invention of claim 6, the coordinate input surface is formed in a rectangular shape, the first light receiving means is disposed in the vicinity of one end of a predetermined side of the coordinate input surface, and the second light receiving means is Since it is arranged in the vicinity of the other end of the predetermined side of the coordinate input surface, there is an effect that the coordinates can be calculated more accurately.

  According to the invention of claim 7, the coordinate input surface is formed in a rectangular shape, the first light receiving means is disposed near one end of a predetermined side of the coordinate input surface, and the second light receiving means is Since the third light receiving means is disposed in the vicinity of the other end of the predetermined side of the coordinate input surface, and is disposed in the vicinity of the coordinate input surface and at a position other than the first light receiving means and the second light receiving means. There is an effect that the coordinates can be calculated more accurately.

  According to the invention of claim 8, the first light emitting means is disposed close to the coordinate input surface, and the second light emitting means is close to the coordinate input surface and at a position different from the first light emitting means. The first light receiving means is disposed in the vicinity of the first light emitting means, and is the light irradiated by the first light emitting means and the second light emitting means and reflected by the reflecting plate, and the light receiving intensity as compared with other regions. The direction of the touch point, which is the direction of strong light, is detected, and the second light receiving means is disposed in the vicinity of the second light emitting means, and is irradiated with the first light emitting means and the second light emitting means and reflected by the reflecting plate. Thus, the touch point direction, which is the direction of light having a higher light receiving intensity than other regions, is detected, and the calculation control means is detected by the touch point direction detected by the first light receiving means and the second light receiving means. Calculate the coordinates of the touch point based on the touch point direction Since an effect that while suppressing the cost, it is possible to accurately detect the coordinates.

  According to the ninth aspect of the present invention, the touch pen is irradiated by the first light emitting unit disposed in the vicinity of the coordinate input surface in the coordinate detection device that detects the coordinates of the touch point touched by the touch pen. Since it includes a reflector that reflects the light and the light emitted by the second light emitting means disposed near the coordinate input surface and at a different position from the first light emitting means, the use of this touch pen reduces the cost. There is an effect that the coordinates can be detected accurately while suppressing.

  According to the invention of claim 10, in the first irradiation step, the first light emitting means arranged close to the coordinate input surface emits light, and in the second irradiation step, the first light emitting means approaches the coordinate input surface. And the 2nd light emission means arrange | positioned in a position different from a 1st light emission means irradiates light, In the 1st light reception step, the 1st light reception means arrange | positioned adjacent to the 1st light emission means is the 1st irradiation step. In addition, in the second light receiving step, the second light emission is detected in the second light receiving step by detecting the direction of the touch point corresponding to the light reflected by the reflecting plate of the touch pen of the light irradiated in the second irradiation step and having a higher light receiving intensity than other regions. The second light receiving means arranged close to the means corresponds to the reflected light of the light irradiated by the first irradiation step and the second irradiation step by the reflecting plate of the touch pen, and the light receiving intensity is higher than that of other regions. Since the strong touch point direction is detected and the calculation control step calculates the coordinates of the touch point based on the touch point direction detected in the first light receiving step and the touch point direction detected in the second light receiving step. There is an effect that the coordinates can be accurately detected while suppressing the cost.

  Exemplary embodiments of a coordinate input system, a coordinate input device, a coordinate input method, and a touch pen according to the present invention will be explained below in detail with reference to the accompanying drawings.

(First embodiment)
FIG. 1 is a diagram illustrating a display device 100 with a touch panel including the coordinate detection device according to the first embodiment. Hereinafter, the characteristic configuration and function of the display device 100 with a touch panel will be described with reference to FIG. The display device 100 with a touch panel includes a coordinate input surface 101, a first optical unit 102A, a second optical unit 102B, a first direction detection unit 104A, a second direction detection unit 104B, a calculation unit 105, and an interface unit 106. It has. The coordinate input surface 101 is a rectangular surface, and is used when a user inputs a touch point (position A in the figure) by touching with a pointing stick such as a touch pen or a finger.

  Both the first optical unit 102A and the second optical unit 102B are arranged close to the coordinate input surface 101, and detect the touch point direction, which is the direction of the touch point at this position, based on the arranged position.

  In the present embodiment, both the first optical unit 102A and the second optical unit 102B are arranged at both ends of one side of the coordinate input surface 101 as shown in FIG. The arrangement position of the first optical unit 102A and the second optical unit 102B is not limited to this as long as the entire area can be irradiated with light.

  Each of the optical units 102A and 102B has a light emitting part and a light receiving part. The light emitting unit and the light receiving unit will be described in detail later with reference to FIGS. 4-1, 4-2, and 5. FIG. The light emitting unit emits light spreading in a fan shape. The light receiving unit receives light recursively reflected by a reflecting plate provided on the touch pen. The touch pen will be described later.

  The light emitting units of the optical units 102A and 102B emit light at the same timing, and the light receiving unit receives light at the same timing. Note that the light receiving unit includes, for example, a line sensor, and detects a touch direction that is reflected and has a high light reception intensity. That is, the touch point direction is detected at the same timing.

  The first direction detection unit 104A and the second direction detection unit 104B detect the touch point directions detected by the corresponding first optical unit 102A and second optical unit 102B, respectively. More specifically, each direction detection unit 104 inputs light information detected by the optical unit 102 as analog data.

  The calculation unit 105 receives the touch point direction from each of the direction detection units 104A and 104B, and calculates touch point coordinates that are coordinates of the touch point based on the touch point direction. The calculation unit 105 further calculates touch point coordinates based on the touch point direction detected by the optical units 102A and 102B. The calculation unit 105 also controls driving of each optical unit 102. The interface unit 106 receives the touch point coordinates from the calculation unit 105 and sends them to a personal computer (PC) 110 as an external device.

  FIG. 2 is a diagram illustrating an external configuration of the touch pen. A contact surface 602 that should contact the coordinate input surface 101 is provided at the tip of the touch pen 600. In addition, a reflecting plate 604 is provided in the vicinity of the contact surface 602. The reflection plate 604 is disposed on the entire periphery of the 600. The reflecting plate 604 has retroreflective properties that recursively reflect the light emitted by the optical units 102A and 102B.

  FIG. 3 is a diagram for explaining the principle by which the direction detection unit 104 and the calculation unit 105 calculate touch point coordinates. The case where the coordinates of the touch point T are calculated based on the touch point direction detected by the first optical unit 102A and the second optical unit 102B will be described with reference to FIG.

Here, the height of the coordinate input surface 101, that is, the length of the short side is H, and the width of the coordinate input surface 101, that is, the length of the long side is L. Also, let W be the distance between the first optical unit 102A and the second optical unit 102B. First, the angle θ1 of the angle formed by the straight line 510 passing through the first optical unit 102A and the touch point T and the straight line 514 passing through the first optical unit 102A and the second optical unit 102B is calculated. That is, the angle θ1 indicates the touch point direction detected by the first optical unit 102A. Further, θ2 is calculated as an angle formed by a straight line 512 and a straight line 514 passing through the second optical unit 102B and the touch point T. That is, the angle θ2 indicates the touch point direction detected by the second optical unit 102B. Further, the coordinates (x, y) of the touch point T are calculated by substituting the angles θ1 and θ2 into the following equations.
x = (W × tan θ2) / (tan θ1 + tan θ2) (1)
y = (W × tan θ1 × tan θ2) / (tan θ1 + tan θ2) (2)

  4A and 4B are diagrams illustrating a detailed configuration of the optical unit 102. FIG. FIG. 4A illustrates a state in which the optical unit 102 is viewed from a direction orthogonal to the traveling direction of the irradiation light in a plane parallel to the coordinate input surface 101, that is, from the x-axis direction. FIG. 4B illustrates a state in which the optical unit 102 is viewed from the traveling direction of the irradiation light, that is, the y-axis direction.

  The optical unit 102 is disposed on a light source 122, lenses 123b and 123c for diffusing the light emitted from the light source 122 in a fan shape, a lens 126 for receiving reflected light, a CCD 127 as a light receiving unit, and an optical axis. Half mirror 124. The CCD 127 functions as a line sensor in which a plurality of elements are arranged.

  These are unitized. As a result, the alignment (distance and center alignment) between the light source 122 and the CCD 127 can be adjusted in units and can be easily adjusted.

  FIG. 5 is a schematic diagram for explaining the principle that the light receiving unit 125 detects the touch point direction. When the touch pen 600 touches a certain position T on the coordinate input surface 101, the reflected light of the irradiated light reaches a corresponding point on the CCD 127 by the reflecting plate 604. Therefore, on the CCD 127, a region (bright point) having a higher light receiving intensity than other regions is generated at the position D corresponding to the position T. This position D has a one-to-one correspondence with the position T. Therefore, the touch point direction of the touch pen can be detected based on the position D detected by the CCD 127.

  Note that a shaded filter may be provided in the rear stage of the cylindrical lens 123c or the front stage of the CCD 127 so that the light reception intensity in the CCD 127 becomes uniform. This eliminates the need to set a direction-dependent threshold value for each element of the CCD 127 and facilitates control.

  As described above, in the display device with a touch panel 100 according to the first embodiment, the reflective member is provided on the touch pen instead of arranging the reflective member around the coordinate input surface 101. In the light receiving unit 125, the reflected light from the reflecting plate arranged around the coordinate input surface 101 is reflected by the reflecting plate of the touch pen in place of detecting a portion shielded by the touch pen, that is, a dark spot. By detecting the reflected light, that is, the bright point, the touch point region corresponding to the touch pen can be detected.

  As described above, since the reflecting plate is arranged on the touch pen, the amount of the reflecting member having the retroreflection characteristic can be extremely small. Some reflecting members are very expensive, and the cost can be greatly reduced.

  Some reflective members are made of a very soft material. In the case where the reflecting member is disposed around the coordinate input surface, there is an operation of attaching a soft member to a strong member such as a sheet metal in the actual machine assembly process. When the reflecting member is very soft, it is easily broken and may be stretched. In such a member, the retroreflective property is remarkably deteriorated and it must be disposed of. In a large-sized touch panel, the length of the reflecting member is 1 meter or more, which is a particular problem. On the other hand, according to the present embodiment, since the reflective member is only provided around the touch pen, it is not necessary to perform the above operation, and the operation cost can be greatly reduced.

  In addition to a touch pen that is a detection target, for example, a writer's hand, a sleeve, or the like may contact the coordinate input surface 101 unintentionally. When a reflecting plate is disposed around the coordinate input surface 101, touch points corresponding to these contacts are further detected, causing erroneous detection. On the other hand, according to the present embodiment, since the reflected light from the reflecting plate of the touch pen is detected, there is no erroneous detection due to the hand or the sleeve, so that the coordinates can be calculated more accurately.

  Next, a detailed hardware configuration of the display device with a touch panel 100 will be described with reference to FIG. In the drawing, only one optical unit 102 and one direction detection unit 104 are shown for convenience, but two optical units 102A and 102B and two direction detection units 104A included in the touch panel display device 100 are shown. , 104B have the same configurations and functions as those of the optical unit 102 and the direction detection unit 104 shown in the figure.

  The optical unit 102 includes a light emitting unit 200 including an LD 122 and a light receiving unit 210 including a CCD 127. The CCD 127 is driven by an image processing LSI (described later) of the direction detection unit 104.

  The direction detection unit 104 includes a CPU 401 that controls the entire direction detection unit 104, a ROM 402 that stores a coordinate detection program, a RAM 403 that is used as a work memory, an image LSI 404 that performs image processing, and data from the optical unit 102. And a shading memory 406 for storing data serving as a reference for performing shading correction.

  The calculation unit 105 includes a CPU 501 that controls the entire calculation unit 105, a ROM 502 that stores a program for controlling the system, a RAM 503 that is used as a work memory, and an interface control unit 504 that controls the interface unit 106. Yes.

  When a plurality of optical units are driven independently, when a touch point is input to the coordinate input surface 101, the touch point direction is detected in one optical unit, but the touch point is detected in another optical unit. The problem that it is not done will arise. For this reason, the CPU 501 of the arithmetic unit 105 generates a trigger and drives the LD 122 according to the generated trigger to make the light emission timing of each LD the same. In addition, a trigger signal 520 is sent to the image LSI 404 of each direction detection unit 104. Then, the image processing LSI 404 drives the CCD 127 according to the trigger signal. Thereby, the CCD 127 can detect the touch point direction at the same timing.

  Thereby, since the two optical units 102A and 102B are driven in synchronization, the two optical units 102A and 102B can detect the touch point direction at the same timing. That is, under the control of the calculation unit 105, the light emitting unit 121 emits light at the same timing, and the light receiving unit 125 receives reflected light at the same timing, that is, detects the touch point direction.

  Further, the CPU 401 of the direction detection unit 104 and the CPU 501 of the calculation unit 105 perform serial communication, and transmit / receive a detection start instruction indicating that detection is to be started and the detected touch point direction (510).

  In this embodiment, a serial interface is used. However, as another example, since communication is performed inside the apparatus, a dedicated interface may be used.

  The coordinate detection program described above is provided in a form that can be installed or executed and recorded on a computer-readable recording medium such as a CD-ROM, floppy (R) disk (FD), or DVD. May be.

  In this case, the coordinate detection program is loaded on the main storage device by being read from the recording medium and executed on the display device 100 with a touch panel, and each unit described in the software configuration is generated on the main storage device. It is like that.

  Further, the coordinate detection program of the present embodiment may be provided by being stored on a computer connected to a network such as the Internet and downloaded via the network.

  As described above, the present invention has been described using the embodiment, but various changes or improvements can be added to the above embodiment.

(Second Embodiment)
FIG. 7 is a diagram illustrating a display device 100 with a touch panel according to the second embodiment. The display device with a touch panel 100 according to the second embodiment includes a third optical unit 102C in addition to the first optical unit 102A and the second optical unit 102B. In addition to the first direction detection unit 104A and the second direction detection unit 104B, a third direction detection unit 104C is provided.

  The functions and the like of the third optical unit 102C are the same as the functions and the like of the other optical units. Further, the function and the like of the third direction detection unit 104C are the same as the functions and the like of the other direction detection units. The third optical unit 102C is disposed near the upper left corner. The arrangement position of the third optical unit C is not limited to the embodiment.

  As described above, by providing the three optical units 102A to 102C, it is possible to detect a touch point corresponding to each touch pen even when two touch pens are simultaneously drawn.

  FIG. 8 is a diagram for explaining processing for detecting two touch points. As shown in FIG. 8, when only two optical units 102A and 102B are drawn simultaneously with two touch pens, the coordinates of dummy points C and D in addition to the actual touch points A and B are calculated. End up. On the other hand, according to the display device with a touch panel 100 of the second embodiment, the third optical unit 102C and the third direction detection unit 104C are further provided, so that the actual touch is based on the detection results. A point and a dummy point can be discriminated.

  Furthermore, even when drawing is simultaneously performed with three touch pens, touch points corresponding to the touch pens can be detected. FIG. 9 is a diagram for explaining processing for detecting three touch points. As with the two touch points, only the two optical units 102A and 102B calculate the coordinates of the dummy points H, I, J, K, L, and M in addition to the actual touch points E, F, and G. End up. On the other hand, according to the display device with a touch panel 100 of the second embodiment, the third optical unit 102C and the third direction detection unit 104C are further provided, so that the actual touch is based on the detection results. A point and a dummy point can be discriminated.

It is a figure which shows the display apparatus with a touch panel 100 containing the coordinate detection apparatus concerning Embodiment 1. FIG. It is a figure which shows the external appearance structure of a touch pen. It is a figure for demonstrating the principle in which the direction detection part 104 and the calculating part 105 calculate a touch point coordinate. 2 is a diagram showing a detailed configuration of an optical unit 102. FIG. 2 is a diagram showing a detailed configuration of an optical unit 102. FIG. It is a schematic diagram for demonstrating the principle in which the light-receiving part 125 detects a touch point direction. It is a figure explaining the detailed hardware constitutions of the display apparatus with a touch panel. It is a figure which shows the display apparatus 100 with a touchscreen concerning 2nd Embodiment. It is a figure for demonstrating the process which detects two touch points. It is a figure for demonstrating the process which detects three touch points.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Touch panel display apparatus 101 Coordinate input surface 102A-102C 1st-3rd optical unit 104A-104C 1st-3rd direction detection part 105 Operation part 106 Interface part 121 Light emission part 123c Cylindrical lens 125 Light reception part 127 CCD
200 light emitting unit 210 light receiving unit 401 CPU
402 ROM
403 RAM
404 Image LSI
405 Data storage memory 406 Shading memory 501 CPU
502 ROM
503 RAM
504 Interface control unit 600 Touch pen 602 Contact surface 604 Reflector

Claims (10)

A coordinate detection system including a touch pen that touches a coordinate input surface and a coordinate detection device that detects coordinates of a touched touch point,
The touch pen has a reflector in the vicinity of a contact surface that contacts the coordinate input surface,
The coordinate detection device includes:
First light emitting means disposed in proximity to the coordinate input surface;
A second light emitting means disposed close to the coordinate input surface and at a position different from the first light emitting means;
A first light receiving means disposed adjacent to the first light emitting means, corresponding to the reflector, and detecting a touch point direction having a higher light receiving intensity than other areas;
A second light receiving means disposed adjacent to the second light emitting means, corresponding to the reflecting plate, and detecting a touch point direction having a higher light receiving intensity than other areas;
Calculation control means for calculating coordinates of the touch point based on the touch point direction detected by the first light receiving means and the touch point direction detected by the second light receiving means. Coordinate detection system.   The coordinate detection system according to claim 1, wherein the touch pen includes the reflecting plate in the vicinity of the contact surface.   The coordinate detection system according to claim 2, wherein the touch pen has the reflector on the entire periphery of the touch pen in the vicinity of the contact surface. The coordinate detection system includes two touch pens,
Each touch pen has the reflector,
The coordinate detection device includes:
A third light emitting means disposed close to the coordinate input surface and at a position different from the first light emitting means and the second light emitting means;
A third light receiving means disposed adjacent to the third light emitting means, corresponding to the reflecting plate, and detecting a touch point direction having a higher light receiving intensity than other regions;
The calculation control means further calculates the coordinates of the touch point corresponding to each of two touch pens based on the touch point direction detected by the third light receiving means. The coordinate detection system as described in any one of Claims. The coordinate detection system includes three touch pens,
Each touch pen has the reflector,
The coordinate detection device includes:
A third light emitting means disposed close to the coordinate input surface and at a position different from the first light emitting means and the second light emitting means;
A third light receiving means disposed adjacent to the third light emitting means, corresponding to the reflecting plate, and detecting a touch point direction having a higher light receiving intensity than other regions;
The calculation control means further calculates the coordinates of the touch point corresponding to each of three touch pens based on the touch point direction detected by the third light receiving means. The coordinate detection system as described in any one of Claims. The coordinate input surface is formed in a rectangle,
The first light receiving means is disposed in the vicinity of one end of a predetermined side of the coordinate input surface,
The coordinate detection system according to claim 1, wherein the second light receiving unit is disposed in the vicinity of the other end of the predetermined side of the coordinate input surface. The coordinate input surface is formed in a rectangle,
The first light receiving means is disposed in the vicinity of one end of a predetermined side of the coordinate input surface,
The second light receiving means is disposed in the vicinity of the other end of the predetermined side of the coordinate input surface,
6. The coordinate detection according to claim 4, wherein the third light receiving unit is disposed in the vicinity of the coordinate input surface and at a position other than the first light receiving unit and the second light receiving unit. system. A pen having a reflector, a coordinate detection device for detecting the coordinates of a touch point touched by a touch pen that touches a coordinate input surface,
First light emitting means disposed in proximity to the coordinate input surface;
A second light emitting means disposed close to the coordinate input surface and at a position different from the first light emitting means;
The direction of light that is disposed in the vicinity of the first light emitting means, is irradiated by the first light emitting means and the second light emitting means and is reflected by the reflecting plate, and has a higher light receiving intensity than other regions. First light receiving means for detecting a touch point direction,
The direction of light that is arranged in the vicinity of the second light emitting means, is irradiated by the first light emitting means and the second light emitting means and is reflected by the reflecting plate, and has a higher light receiving intensity than other regions. Second light receiving means for detecting the touch point direction,
And a calculation control means for calculating coordinates of the touch point based on the touch point direction detected by the first light receiving means and the touch point direction detected by the second light receiving means. Coordinate detection device. A touch pen that touches the coordinate input surface,
In the coordinate detection device that detects the coordinates of the touch point touched by the touch pen, the light emitted by the first light emitting unit disposed in proximity to the coordinate input surface, the proximity to the coordinate input surface, and the A touch pen comprising a reflecting plate for reflecting light emitted from a second light emitting means arranged at a position different from the first light emitting means. A first irradiation step in which a first light emitting means arranged close to the coordinate input surface emits light;
A second irradiation step in which the second light emitting means disposed near the coordinate input surface and at a position different from the first light emitting means emits light;
The first light receiving means arranged in the vicinity of the first light emitting means corresponds to the light reflected by the reflecting plate of the touch pen of the light emitted by the first irradiation step and the second irradiation step, A first light receiving step for detecting a direction of a touch point having a higher light receiving intensity than the region;
The second light receiving means arranged in the vicinity of the second light emitting means corresponds to the light reflected by the reflecting plate of the touch pen of the light emitted by the first irradiation step and the second irradiation step, A second light receiving step for detecting a touch point direction in which the light receiving intensity is stronger than the area;
A calculation control step of calculating coordinates of the touch point based on the touch point direction detected in the first light receiving step and the touch point direction detected in the second light receiving step. Coordinate detection method.

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