JP2014222408A - Touch panel device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a touch panel device capable of suppressing infrared light from being reflected by a translucent plate covering a light emitting element or light receiving element to cause wrong detection by the reflected light.SOLUTION: In a touch panel device 100 which includes a display surface 101, an array of light emitting elements 911 emitting infrared light along the display surface 101 and an array of light receiving elements 921 receiving the infrared light, and a strip translucent plate 81 covering the array of the light emitting element 911 or the array of the light receiving elements 921, and detects the position of a light shield body on the display surface 101, the translucent plate 81 is provided with light absorption parts 811, 813 which contain chlorophyll and absorb incident infrared light, so that the light absorption parts 811, 813 absorb infrared light being incident on the translucent plate 81 at a small angle of incidence.

Description

  The present invention covers a display surface, a row of light emitting elements that irradiates infrared light along the display surface, a row of light receiving elements that receive the infrared light, and the row of light emitting elements or the row of light receiving elements. The present invention relates to a touch panel device that includes a strip-shaped translucent plate and detects a position of a light blocking object on the display surface.

  In recent years, coordinates relating to information written on the display surface are detected, and the image displayed on the display surface is overwritten to display the information on the computer, or the written information is displayed on the computer. Electronic whiteboards that can be captured in real time have become widespread.

  Various methods have been proposed as a coordinate input and coordinate detection method used in an electronic whiteboard, and one of them is an infrared blocking method using infrared rays. FIG. 12 is an explanatory diagram for explaining coordinate detection and coordinate input in an infrared shielding electronic whiteboard.

  In such an infrared blocking electronic whiteboard 200, a number of LEDs 1, 2, 3,... That emit infrared light on one side (not shown) in the vertical direction and one side in the horizontal direction of the display unit 201 are provided. The light receiving elements 1, 2, 3,... (Phototransistors) are arranged in one row at the same interval as the LED rows on the sides facing the LED rows. The light-receiving element pairs are sequentially scanned to detect whether or not infrared light is blocked by the infrared light blocker in the X direction (horizontal) and Y direction (vertical), and the position of the blocker is recognized as an input position. Is.

  For example, when infrared light emitted from the LED 3 (hereinafter simply referred to as infrared light) is shielded by the light shield S, the amount of light received by the light receiving elements 1 to 5 is reduced. Based on the change in the amount of light received by the light receiving elements 1, 2, 3,. In this example, for a light emission of one LED, a change in the amount of received light is detected by a plurality of light receiving elements.

  On the other hand, in Patent Document 1, high-resolution coordinate output is performed based on the position coordinates obtained by dividing the distance between the arranged light emitting elements and light receiving elements into a predetermined number in advance, and the display surface An infrared cut-off type touch panel that intensively scans only around the coordinates of a light-shielding object detected at an arbitrary location is disclosed.

JP 2000-20227 A

  In the above-described infrared blocking electronic whiteboard, a transmission filter that transmits infrared light from the LED is provided at the boundary between the bezel portion where the LED and the light receiving element are disposed and the display surface. Thereby, in the LED or the light receiving element, unnecessary incident light from the outside can be blocked and the mounting substrate can be protected.

  However, when the infrared light from any LED enters the transmission filter at a shallow angle, the incident infrared light is reflected by the transmission filter, and is erroneously detected by the reflected / diffracted light of the light. May occur. Hereinafter, the reflected / diffracted light that causes such erroneous detection is referred to as stray light.

  For example, as shown in FIG. 12, infrared light emitted from the LED 1 and the LED 2 spreads with a predetermined width, and a part of the light has a shallow incident angle (inner angle) and is transmitted in the vertical direction. When incident on the filter 202, the incident light is reflected by the transmission filter 202 and travels toward the light receiving element 1 and the light receiving element 2. Therefore, in the light receiving element 1 and the light receiving element 2, the reflected light is received and the amount of received light is changed, so that the detection of the light shielding object S is affected.

  However, the infrared shielding touch panel according to Patent Document 1 cannot solve such a problem.

  The present invention has been made in view of such circumstances, and an object thereof is to receive a display surface, a row of light emitting elements that irradiate infrared light along the display surface, and the infrared light. In a touch panel device that includes a row of light receiving elements and a strip-shaped translucent plate that covers the light emitting element row or the light receiving element row, and includes a chlorophyll in the touch panel device that detects the position of the light blocking object on the display surface, By providing a light absorbing part for absorbing incident infrared light on the light transmitting plate, as described above, the light absorbing part absorbs infrared light incident with a shallow incident angle, and the red light is absorbed. It is providing the touch panel apparatus which can suppress that external light is reflected from the said translucent board.

  A touch panel device according to the present invention includes a display surface, a row of light emitting elements that irradiates infrared light along the display surface, a row of light receiving elements that receive the infrared light, and the row of light emitting elements or the light receiving elements. In the touch panel device for detecting the position of the light-shielding object on the display surface, the light-transmitting plate contains chlorophyll and absorbs incident infrared light. Is provided at one edge of the display surface side.

  In the touch panel device according to the present invention, the light transmissive plate is provided with the light absorbing portion on the other edge portion facing the one edge portion.

  The touch panel device according to the present invention is characterized in that at least one of the one edge portion and the other edge portion has a light absorption film containing chlorophyll.

  The touch panel device according to the present invention is characterized in that chlorophyll is mixed in the translucent plate in at least one light absorbing portion of the one edge portion and the other edge portion.

  The touch panel device according to the present invention includes a frame body that is provided around an edge of the display surface, and the frame body is provided with a groove for attaching and detaching the translucent plate. .

  According to the present invention, a light absorbing portion that contains chlorophyll and absorbs incident infrared light is provided in the translucent plate, and as described above, incident infrared light having a shallow angle of incidence is Absorption by the light absorbing portion can prevent the infrared light from being reflected from the translucent plate, thereby suppressing the occurrence of erroneous detection.

It is the conceptual diagram which displayed notionally the electronic whiteboard of Embodiment 1 of this invention. It is a functional block diagram which shows the principal part structure of the electronic whiteboard of Embodiment 1 of this invention. It is a functional block diagram which shows the principal part structure of the control part in the touch panel part of the electronic whiteboard of Embodiment 1 of this invention. It is a functional block diagram explaining the scanning process of the light in the electronic whiteboard of Embodiment 1 of this invention. It is explanatory drawing explaining the detection and the detection of a light-shielding object in the electronic whiteboard of Embodiment 1 of this invention. It is a fragmentary perspective view which shows the corner part of the display part in the electronic whiteboard which concerns on Embodiment 1 of this invention. It is sectional drawing by the AB line | wire of FIG. It is explanatory drawing explaining the structure of a translucent plate at the time of seeing a translucent plate from the arrow direction in FIG. It is an experimental result which shows the influence by reflection of the incident infrared light in a translucent board in the electronic whiteboard which concerns on Embodiment 1 of this invention. It is a partial cross section which shows the structure of the translucent board in the electronic whiteboard which concerns on Embodiment 2 of this invention. It is a partial cross-sectional view which shows the structure of the translucent board and frame in the electronic whiteboard which concerns on Embodiment 3 of this invention. It is explanatory drawing explaining the coordinate detection and coordinate input in an infrared rays shielding type electronic whiteboard.

  Hereinafter, the case where the touch panel device according to the present invention is applied to a so-called electronic whiteboard will be described in detail with reference to the drawings.

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

  The electronic whiteboard 100 according to the first embodiment of the present invention includes a display unit 100A and a touch panel unit 100B, and the touch panel unit 100B includes a light emitting element that emits infrared light and a light receiving element that receives infrared light. This is a so-called infrared shielding touch panel that detects the position of an object. In the electronic whiteboard 100, for example, the display unit 100A is connected to a personal computer (hereinafter referred to as a PC) through HDMI (registered trademark) and the touch panel unit 100B through USB. In this embodiment, the display unit 100A and the touch panel unit 100B are configured independently for each function of video display and coordinate instruction, but are integrated for the purpose of synchronizing the display and coordinate instruction. It may be configured and controlled automatically. Further, the I / F for video display and coordinate instruction is not limited to HDMI and USB, and other methods may be used.

  The display unit 100A includes, for example, an LCD or an EL (Electroluminescence) panel, and displays video output from the PC and characters, line drawings, and the like received from the user via the touch panel unit 100B and the PC. In addition, a touch panel unit 100B is provided so as to surround the display surface of the display unit 100A.

  The touch panel unit 100 </ b> B includes a control unit 1, a ROM 2, a RAM 3, an I / F unit 5, and a scanning unit 9, and transmits / receives coordinate data to / from the PC via the I / F unit 5.

  The control unit 1 of the touch panel unit 100B displays characters, line drawings, etc. on the display unit 100A by accepting writing / drawing of characters, line drawings, etc. via the PC based on the coordinates related to the scanning result by the scanning unit 9. .

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

  The control unit 1 loads the control program stored in advance in the ROM 2 onto the RAM 3 and executes it, thereby controlling the various hardware described above via the bus and causing the touch panel unit 100B to function.

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

  The coordinate calculation unit 12 calculates coordinates on the display surface of the display unit 100A of a light shielding object such as a pen-shaped input device or a finger. Specifically, the coordinates of such a light blocking object are calculated based on an intensity signal described later, which is sent when the light blocking on the display surface of the display unit 100A is detected by the touch panel unit 100B.

  The light shielding object management unit 13 manages the position (coordinates) of the light shielding object detected by the scanning of the scanning unit 9. For example, when the light shielding object moves, the light shielding object management unit 13 stores a coordinate history representing the movement of the light shielding object.

  The detection unit 14 detects the positions of one or more light shielding objects on the display surface of the display unit 100A. Specifically, the scanning unit 9 of the touch panel unit 100B scans the entire area on the display surface of the display unit 100A, and the detection is performed based on the intensity signal related to the result of the wide area scanning acquired from the touch panel unit 100B. The unit 14 detects the coordinates of the light shielding object on the display surface of the display unit 100A.

  Further, the CPU 11 controls the light emitting element and the light receiving element of the scanning unit 9.

  The touch panel unit 100B is an infrared shielding touch panel as described above. That is, when a light block is detected when the tip of a pen-type input device or a finger (not shown) comes close to the display surface of the display unit 100A, such a light shielding object (pen-type input device or finger) is detected. Detect position. That is, as a result of scanning, a signal (intensity signal) obtained from the light receiving element is sent to the control unit 1, and based on this, the coordinate calculation unit 12 calculates the coordinates of such a light shielding object. In this way, the touch panel unit 100B accepts input of position designation on the display unit 100A, characters, line drawings, and the like from the user.

  The touch panel unit 100B includes a scanning unit 9 that scans infrared light along the display surface of the display unit 100A. The scanning unit 9 includes a light emitting unit 91 having a plurality of light emitting elements that emit infrared light, and A light receiving unit 92 having a plurality of light receiving elements that receive infrared light from the corresponding light emitting elements, and an address decoder that assigns light emission signals and light reception signals from the control unit 1 (CPU 11) to the light emitting units 91 and 92, respectively. 93 and an A / D converter 94 for converting an analog signal from the light receiving unit 92 used for detecting light blockage into a digital signal.

  FIG. 4 is a functional block diagram illustrating light scanning processing in the electronic whiteboard 100 according to Embodiment 1 of the present invention.

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

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

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

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

  Based on the determination result of the CPU 11, the coordinate calculation unit 12 and the detection unit 14 calculate the position of the light shielding object. That is, the coordinate calculation unit 12 and the detection unit 14 specify a light receiving element whose infrared light path is blocked, and based on the position of the specified light receiving element, the coordinates of the light shielding object on the display surface of the display unit 100A. The process which calculates is performed.

  Hereinafter, the scanning and detection of the light shielding object will be described in detail. FIG. 5 is an explanatory diagram for explaining scanning and detection of a light shielding object in the electronic whiteboard 100 according to Embodiment 1 of the present invention.

  The display surface of the display unit 100A has a rectangular shape, and a plurality of light emitting elements 911, 911,... Are arranged in parallel along the edge of the display unit 100A on the right side and the lower side of the display surface in the drawing. . The light emitting element 911 is, for example, a light emitting diode (LED) that emits infrared light. In the drawing, the optical path of the infrared light emitted from each light emitting element 911 is indicated by a solid arrow.

  The plurality of light emitting elements 911, 911,... On the right side are provided such that the optical paths of the infrared light emitted from the respective light emitting elements 911 are parallel to each other along the display surface. , 911,... Are similarly provided.

  That is, the right light-emitting elements 911, 911,... In the left-right direction (x-axis direction) and the plurality of lower light-emitting elements 911, 911,. They are provided so as to be orthogonal to each other.

  Further, light receiving elements 921, 921,... Are provided on the display surface of the display unit 100A at positions facing the light emitting elements 911, 911,.

  That is, on the left side and the upper side of the display surface of the display unit 100A, a plurality of rows of light receiving elements 921, 921,. The light receiving element 921 is a light receiving diode that receives infrared light. The infrared light from the light emitting elements 911, 911,... Is received by the light receiving elements 921, 921,.

  As in the case of the light emitting elements, the upper light receiving elements 921, 921, ... and the left light receiving elements 921, 921, ... are provided so that the optical paths of the infrared light to be received are orthogonal to each other.

  The scanning unit 9 sequentially causes the light emitting elements 911 to emit light one by one from the one end to the other end in the X-axis direction and from one end to the other end in the Y-axis direction on the display surface of the display unit 100A. The position, size, etc. of the light-shielding object on the display surface are detected as described above.

  6 is a partial perspective view showing a corner portion of display portion 100A in electronic whiteboard 100 according to Embodiment 1 of the present invention, and FIG. 7 is a cross-sectional view taken along line AB in FIG.

  The electronic whiteboard 100 includes a display surface 101 of the display unit 100 </ b> A and a bezel portion 8 provided around the edge of the display surface 101.

  The bezel portion 8 has a hollow frame 82 that covers the edge of the display surface 101, and light emitting elements 911, 911,. A translucent plate 81 is provided at the end of the bezel 8 on the display surface 101 side.

  As described above, the translucent plate 81 is a strip-shaped plate material provided so as to cover the light emitting elements 911, 911,... And the light receiving elements 921, 921,. It is. The light transmitting plate 81 transmits infrared light emitted from the light emitting elements 911, 911,... And infrared light incident on the light receiving elements 921, 921,. Further, the light-transmitting plate 81 has a blindfold function for preventing the light-emitting elements 911, 911,... And the light-receiving elements 921, 921,. It plays the role of protecting the board.

  The translucent plate 81 is made of, for example, polycarbonate, acrylic, or the like, and has a width L in the short direction of, for example, 16 mm. Both long sides on the back side are supported by the end of the frame body 82 and the display surface 101, respectively. In this state, the end is adhered with an adhesive or the like.

  Inside the frame 82, light emitting elements 911, 911,... Are mounted on a substrate 912 arranged orthogonal to the display surface 101, and infrared light emitted from the light emitting portions of the light emitting elements 911, 911,. It passes through the optical plate 81 and proceeds toward the light receiving elements 921, 921,.

  The translucent plate 81 has a translucent portion 812 that transmits infrared light from the light emitting elements 911, 911,..., And other light emission incident at a shallow incident angle from the longitudinal end side of the translucent plate 81. An upper light absorption unit 811 and a lower light absorption unit 813 that absorb infrared light from the element to prevent reflection are provided.

  The lower light absorbing portion 813 is a portion having a constant width L3 on the display surface 101 side in the short side direction of the translucent plate 81 and extends along the longitudinal direction of the translucent plate 81.

  The upper light absorbing portion 811 is a portion having a constant width L1 opposite to the lower light absorbing portion 813 in the short direction of the light transmitting plate 81 and extends along the longitudinal direction of the light transmitting plate 81.

  The light transmitting portion 812 is a portion between the upper light absorbing portion 811 and the lower light absorbing portion 813 in the short direction of the light transmitting plate 81 and has a certain width L2.

  That is, the width L of the translucent plate 81 in the short direction is “L = L1 + L2 + L3”. Further, the light transmitting plate 81 has a light absorbing film 811A or a light absorbing film 813A as described later.

  FIG. 8 is an explanatory view for explaining the configuration of the light transmitting plate 81 when the light transmitting plate 81 is viewed from the direction of the arrow in FIG.

  As described above, the upper light absorbing portion 811 is provided on one long side of the translucent plate 81, and the lower light absorbing portion 813 is provided on the other long side. That is, a lower light absorbing portion 813 is provided on the display surface 101 side with the light transmitting portion 812 interposed therebetween, and an upper light absorbing portion 811 is provided on the opposite side. The widths of the upper light absorbing portion 811, the light transmitting portion 812, and the lower light absorbing portion 813 in the width direction (short direction) of the light transmitting plate 81 are, for example, 6 mm, 6 mm, and 4 mm, respectively.

  The upper light absorption portion 811 has a light absorption film 811A, and the lower light absorption portion 813 has a light absorption film 813A. In other words, in the translucent plate 81, a light absorption film 813A is attached to the surface of one edge portion on the display surface 101 side, and light absorption is performed on the surface of the other edge portion on the opposite side to the one edge portion. A film 811A is attached. That is, the upper light absorption part 811 and the lower light absorption part 813 both have a light absorption film, and the light absorption films 811A and 813A absorb the incident infrared light, and the infrared light is reflected. This prevents the stray light described above.

  Further, the present invention is not limited to this, and it may be configured to include only one of the light absorption film 811A and the light absorption film 813A.

  In the electronic whiteboard 100 according to Embodiment 1 of the present invention, the light absorption films 811A and 813A include, for example, chlorophyll that is a photosynthetic pigment. More specifically, the light absorbing film 811A and the light absorbing film 813A are made of, for example, a light-transmitting plate made of a paste obtained by kneading and dispersing green tea powder or the like containing a chlorophyll component in an appropriate solvent (for example, an acrylic solvent or an enamel solvent). It forms by apply | coating on the said one edge part and other edge part of 81.

  Chlorophyll is a chemical substance that has the role of absorbing light energy in the photosynthetic reaction, and absorbs light in the vicinity of 450 nm, 700 nm, and 850 nm, so that it can absorb infrared light. Examples of the chlorophyll component include chlorophyll d and bacteriochlorophyll a.

  FIG. 9 shows experimental results showing the influence of reflection of incident infrared light on the light transmitting plate 81 in the electronic whiteboard 100 according to Embodiment 1 of the present invention. More specifically, FIG. 9 shows a change in the amount of light received by one light receiving element 921 corresponding to a case where infrared light is emitted from one light emitting element 911.

  Such an experiment was carried out using a paste obtained by kneading and dispersing 5% Matcha powder in an acrylic solvent on the surface of the one edge and the other edge of the light transmitting plate 81 made of polycarbonate. More specifically, the acrylic solvent is 0.95 g, the matcha powder is 0.05 g, and the weight ratio is 5%.

  Further, as a comparison object, on the basis of the case where no translucent plate is attached and no reflection of incident infrared light occurs, a portion corresponding to the one edge portion and the other edge portion of the translucent plate 81 is subjected to aminium. The case where an infrared absorbing material such as a system or dimonium was attached and the case where a conventional translucent plate with a so-called infrared antireflection tape was attached were used as targets.

  As can be seen from FIG. 9, the case where the infrared absorbing material is attached and the case where the conventional light-transmitting plate is attached are 1.3%, 1.. It can be confirmed that an increase in received light amount of 5% occurs. This is because the stray light due to reflection of incident infrared light is received.

  On the other hand, in the electronic whiteboard 100 according to the present invention in which the translucent plate 81 contains chlorophyll, the amount of received light is only increased by 0.7% compared to the case where the translucent plate is not attached. Compared with the case of attaching an infrared absorbing material and the case of attaching a conventional translucent plate, an excellent effect is exhibited.

  As described above, in the electronic whiteboard 100 according to Embodiment 1 of the present invention, with the above-described configuration, the light transmitting plate 81 has a shallow incident angle from the longitudinal end side of the light transmitting plate 81. Infrared light from other incident light emitting elements is absorbed by the upper light absorbing portion 811 (light absorbing film 811A) and the lower light absorbing portion 813 (light absorbing film 813A), and thus is caused by stray light as described above. It is possible to prevent erroneous detection of the light shielding object.

(Embodiment 2)
The electronic whiteboard 100 according to the second embodiment of the present invention has substantially the same configuration as the electronic whiteboard 100 according to the first embodiment, but differs in the configuration of the translucent plate 81.

  FIG. 10 is a partial cross-sectional view showing the configuration of the light transmitting plate 81 in the electronic whiteboard 100 according to Embodiment 2 of the present invention.

  In the second embodiment, the translucent plate 81 includes a translucent portion 812 that transmits infrared light from the light emitting elements 911, 911, and the like, and an end in the longitudinal direction of the translucent plate 81, as in the first embodiment. An upper light absorption unit 811 and a lower light absorption unit 813 are provided that absorb infrared light from other light emitting elements incident at a shallow incident angle from the side to prevent reflection.

  The lower light absorbing portion 813 is a portion having a constant width L3 on the display surface 101 side in the short side direction of the translucent plate 81 and extends along the longitudinal direction of the translucent plate 81. The upper light absorbing portion 811 is a portion having a constant width L1 opposite to the lower light absorbing portion 813 in the short direction of the light transmitting plate 81 and extends along the longitudinal direction of the light transmitting plate 81.

  The light transmitting portion 812 is a portion between the upper light absorbing portion 811 and the lower light absorbing portion 813 in the short direction of the light transmitting plate 81 and has a certain width L2.

  Both the upper light absorption part 811 and the lower light absorption part 813 are mixed with chlorophyll. That is, in the light transmitting plate 81, the chlorophyll component is uniformly distributed in portions corresponding to the upper light absorbing portion 811 and the lower light absorbing portion 813.

  As described above, chlorophyll is a chemical substance that has a role of absorbing light energy in the photosynthesis reaction, and absorbs light in the vicinity of 450 nm, 700 nm, and 850 nm. Accordingly, the upper light absorption unit 811 and the lower light absorption unit 813 absorb incident infrared light and prevent the stray light described above from being reflected by the reflection of the infrared light.

  In the electronic whiteboard 100 according to Embodiment 2 of the present invention, the upper light absorption unit 811 and the lower light absorption unit 813 are kneaded with a chlorophyll component by an appropriate heat treatment. Alternatively, the translucent plate 81 is provided by, for example, joining a polycarbonate plate material mixed with matcha powder and a polycarbonate plate material not mixed with matcha powder. Moreover, it is not restricted to this, You may diffuse a chlorophyll component partially in the upper light absorption part 811 and the lower light absorption part 813. FIG.

  With this configuration, in the electronic whiteboard 100 according to Embodiment 2 of the present invention, with respect to the translucent plate 81, at a shallow incident angle from the end side in the longitudinal direction of the translucent plate 81. Infrared light from other incident light emitting elements is absorbed by the upper light absorbing portion 811 and the lower light absorbing portion 813, so that it is possible to prevent the erroneous detection of the light shielding material due to stray light as described above.

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

(Embodiment 3)
The electronic whiteboard 100 according to the third embodiment of the present invention has substantially the same configuration as the electronic whiteboard 100 according to the first embodiment, but is different in the configuration of the translucent plate 81 and the frame body 82.

  FIG. 11 is a partial cross-sectional view showing the configuration of the translucent plate 81 and the frame body 82 in the electronic whiteboard 100 according to Embodiment 3 of the present invention.

  In the electronic whiteboard 100 according to the third embodiment, the frame body 82 is formed with grooves 83A and 83B that detachably hold the translucent plate 81 at the edge on the display surface 101 side. More specifically, a groove 83 </ b> B is formed at one edge in the vicinity of the display surface 101 among the edges on the display surface 101 side of the frame 82, and the other edge away from the one edge from the display surface 101. A groove 83A is formed in the part.

  By the groove 83A and the groove 83B of the frame body 82, the long side portion on the upper light absorbing portion 811 side and the long side portion on the lower light absorbing portion 813 side of the light transmitting plate 81 are locked. Specifically, the insides of the grooves 83A and 83B have a shape that follows both long side portions of the translucent plate 81, and the translucent plate 81 is slidably locked. For example, when the translucent plate 81 is assembled, the translucent plate 81 may be inserted into the inside of the grooves 83A and 83B from one opening end of the grooves 83A and 83B and slid.

  Therefore, in the electronic whiteboard 100 according to Embodiment 3, the translucent plate 81 can be attached and detached as necessary. For example, when the absorption function of infrared light is reduced due to oxidation of chlorophyll contained in the upper light absorption part 811 and the lower light absorption part 813, the translucent plate 81 is appropriately replaced, and the infrared light absorption function Can cope with inferiority.

  In the frame 82, the portion related to the grooves 83 </ b> A and 83 </ b> B, which is visible from the front side of the display surface 101 in a state where the translucent plate 81 is locked, is the upper light absorption according to the first embodiment. Similar to the portion 811 or the lower light absorption portion 813, a light absorption film portion is provided.

  That is, the light absorption film 813B is affixed to the outer end surface of the frame 83, which is the front end portion of the one edge portion of the frame body 82. A light absorbing film 811B is attached to the outer surface of the groove 83A, which is the tip of the other edge of the frame 82.

  As in the first embodiment, the light absorption film 811B and the light absorption film 813B are made of a paste obtained by kneading and dispersing green tea powder or the like containing a chlorophyll component in an appropriate solvent (for example, an acrylic solvent or an enamel solvent). It forms by apply | coating on the end surface of the said one edge part and other edge part of the optical plate 81. FIG.

  With such a configuration, infrared light incident on the light transmitting plate 81 at a shallow incident angle from the end in the longitudinal direction of the light transmitting plate 81 is prevented from being reflected by such an edge of the frame body 82, It is possible to prevent erroneous detection of the light shielding object due to stray light resulting from this.

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

  In the above description, the translucent plate 81 covering the light emitting elements 911, 911,... Has been described as an example, but the present invention is not limited to this, and the translucent plate 81 covering the light receiving elements 921, 921,. Needless to say, the same is true.

In the present invention, the display surface 101, the row 91 of light emitting elements 911 that irradiate infrared light along the display surface 101, the row 92 of light receiving elements 921 that receive the infrared light, and the light emitting elements 911 In the touch panel device 100 for detecting the position of the light-shielding object on the display surface 101, the light-transmitting plate 81 contains chlorophyll. In addition, a light absorbing portion 813 that absorbs incident infrared light is provided at one edge of the display surface 101 side.
According to the present invention, a light absorbing portion that contains chlorophyll and absorbs incident infrared light is provided at one edge portion of the light transmitting plate, and as described above, the red light that is incident with a shallow incident angle. By absorbing the external light by the light absorbing portion, it is possible to suppress the infrared light from being reflected from the light transmitting plate, and it is possible to suppress the occurrence of erroneous detection.
In the present invention, the light transmitting plate 81 is characterized in that the light absorbing portion 811 is provided on the other edge portion facing the one edge portion.
According to the present invention, a light absorbing portion that contains chlorophyll and absorbs incident infrared light is also provided at the other edge portion of the translucent plate, and is incident with a shallow incident angle as described above. It can suppress that infrared light is reflected from the said translucent board, and can suppress generation | occurrence | production of the misdetection by this.
In the present invention, at least one of the light absorbing portions 811 and 813 of the one edge portion and the other edge portion includes light absorbing films 811A and 813A containing chlorophyll.
According to the present invention, the light absorbing film absorbs infrared light incident at a shallow incident angle with respect to the light transmitting plate, so that the infrared light is reflected from the light transmitting plate. This can suppress the occurrence of erroneous detection.
In the present invention, chlorophyll is mixed in the light transmitting plate 81 in at least one of the light absorbing portions 811 and 813 of the one edge portion and the other edge portion.
According to the present invention, the chlorophyll mixed in the light transmissive plate absorbs infrared light incident at a shallow incident angle with respect to the light transmissive plate in the light absorbing portion. Occurrence of erroneous detection due to reflection of such infrared light from the light transmitting plate can be suppressed.
In the present invention, a frame body 82 is provided around the edge of the display surface 101, and the frame body 82 is provided with grooves 83A and 83B for attaching and detaching the light transmitting plate 81. It is characterized by.
According to the present invention, the user can attach and detach the translucent plate as necessary.

81 Translucent plate 82 Frame 83A, 83B Groove
91 Light-Emitting Element Row 92 Light-Receiving Element Row 100 Touch Panel Device 101 Display Surface 811, 813 Light Absorbing Part 811A, 813A Light Absorbing Film 911 Light-Emitting Element 921 Light-Receiving Element

Claims (5)

A display surface, a row of light emitting elements that irradiates infrared light along the display surface, a row of light receiving elements that receive the infrared light, and a strip-shaped transparent light that covers the light emitting element row or the light receiving element row. In a touch panel device comprising a light plate and detecting the position of a light blocking object on the display surface,
The translucent plate is
A touch panel device comprising a light absorbing portion containing chlorophyll and absorbing incident infrared light at one edge of the display surface side. The translucent plate is
The touch panel device according to claim 1, wherein the light absorbing portion is provided on the other edge portion facing the one edge portion.   The touch panel device according to claim 2, wherein at least one of the one edge portion and the other edge portion has a light absorption film containing chlorophyll.   3. The touch panel device according to claim 2, wherein chlorophyll is mixed in the light-transmitting plate in at least one light absorbing portion of the one edge portion and the other edge portion.   5. The frame according to claim 1, further comprising a frame that is provided along an edge of the display surface, wherein the frame is provided with a groove for attaching and detaching the light-transmitting plate. The touch panel device according to 1.

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