JP2017076251A - Writing board and display system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a writing board allowing a handwriting input to a computer, etc. even if a general purpose pencil and an eraser are used, while making an input locus visible.SOLUTION: A writing board includes: a surface layer plate forming a supporting face supporting a writing sheet; a touch sensor laminated on the surface layer plate and configured to detect a contact position or an approach position of an outer conductor to the supporting face; a shielding film arranged on the touch sensor at the opposite side to the surface layer plate; and a pressure sensor arranged on the shield film at the opposite side to the touch sensor.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a writing board that supports a writing sheet such as paper as a writing medium, and a display system having the writing board.

  Conventionally, a handwriting input support device that enables handwriting input to a computer or the like is known. For example, Patent Literature 1 discloses a handwriting input support device that includes a position detection device having an input surface and a pen-type position indicator having a pen tip for performing input to the input surface of the position detection device. Has been.

JP 2010-117943 A

  In the conventional handwriting input support device as shown in Patent Document 1, since the input to the input surface of the position detection device is performed using a dedicated pen-type position indicator, the input to the input surface is not performed. The trajectory (handwriting) was not visible, causing inconvenience. Specifically, once the pen is moved away from the input surface during handwriting input, it is difficult to continuously input to an accurate position corresponding to the trajectory because the input trajectory until then cannot be visually recognized. .

  Further, the conventional handwriting input support device requires a dedicated pen (pen-type position indicator) for performing input to the input surface of the position detection device. For this reason, there is a problem that the configuration of the entire handwriting input support device is complicated and the cost of the device increases. There is also a problem that the handwriting input support device cannot be used if the dedicated pen is lost.

  For example, there is a desire to use such a handwriting input support device at educational sites such as elementary school, junior high school, and high school. In the education field, it is desired to use a handwriting input support device on the premise of writing and erasing on a normal paper with a general-purpose pencil and eraser. However, the conventional handwriting input support device cannot properly recognize input and erasure by a general-purpose pencil and eraser.

  The present invention has been made in consideration of the above points, and provides a writing board capable of performing handwriting input to a computer or the like using a general-purpose pencil and an eraser while making an input locus visible. For the purpose. Moreover, a display system provided with this writing board is provided.

  The writing board of the present invention includes a surface layer plate that forms a support surface for supporting a writing sheet, a touch sensor that is stacked on the surface layer plate and detects a contact position or an approach position of an external conductor on the support surface, and a touch sensor A shielding film disposed on the side opposite to the surface layer plate and a pressure-sensitive sensor disposed on the opposite side of the shielding film from the touch sensor are provided.

  The writing boat may further include a control unit that receives detection signals from the touch sensor and the pressure sensor and performs arithmetic processing. In this control unit, writing is performed when detection by the touch sensor is performed. When the detection by the pressure sensor is performed without performing the detection by the touch sensor, an operation is performed to determine that the character is erased.

  The display system of this invention is equipped with the said writing board and the display apparatus connected to a writing board and displaying the content of writing.

  According to the present invention, the input trajectory can visually recognize writing with a normal pencil on a medium such as paper, and the writing board can distinguish and recognize input with a general-purpose pencil and erasure with a general-purpose eraser. It is possible to carry out appropriate handwriting input to the.

FIG. 1A is an external perspective view of the writing board 10, and FIG. 1B is a cross-sectional view of the writing board 10. FIG. 2 is a cross-sectional view for explaining the layer structure of the detecting means 30 of the writing board 10. FIG. 3 is a plan view showing the touch sensor 32 of the writing board 10. FIG. 4 is a partially enlarged view of the touch sensor 32 of FIG. 3 and shows a conductive mesh of the touch sensor. FIG. 6 is a diagram for explaining a writing scene. FIG. 7 is a diagram for explaining a scene of erasing.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings attached to the present specification, for the sake of illustration and ease of understanding, the scale and the vertical / horizontal dimension ratio may be appropriately changed and exaggerated from those of the actual ones.

In this specification, the terms “plate”, “sheet”, and “film” are not distinguished from each other only based on the difference in designation. For example, “sheet” is a concept that includes a member that can be called a plate or a film. Therefore, “display sheet” is different from a member called “display plate” or “display film” only in a difference in name. Cannot be distinguished.
In addition, “sheet surface (plate surface, film surface)” means a target sheet-like member (plate-like) when the target sheet-like (plate-like, film-like) member is viewed as a whole and globally. It refers to the surface that coincides with the plane direction of the member or film-like member.

  Furthermore, the shape and geometric conditions used in the present specification and the degree thereof are specified. For example, terms such as “parallel”, “orthogonal”, “identical”, length and angle values, etc. are strictly Without being bound by meaning, it should be interpreted including the extent to which similar functions can be expected.

  1A is a perspective view schematically showing a writing board 10 according to one embodiment, and FIG. 1B is a drawing board 10 cut along a line indicated by Ib-Ib in FIG. FIG. FIG. 2 is a diagram for enlarging the portion indicated by II in FIG. 1B and explaining the layer structure of the detection means 20. In FIG. 2, the layers are separated from each other for easy understanding, but actually, these layers are bonded by OCA (Optical Clear Adhesive, optical glue).

  As can be seen from FIG. 1A, FIG. 1B, and FIG. 2, the writing boat 10 has a casing 11, a control means 20 that is housed inside the casing 11, and a detection means 30. Configured.

The casing 11 is a hollow box-like member that forms the outline of the writing board 10 and has the required strength and scratch resistance. Although the material which comprises the writing board 10 is not specifically limited, For example, it may be comprised from resin materials, such as ABS resin and polycarbonate resin.
Control means 20 and detection means 30 are housed inside the casing 11. Therefore, the housing 11 also includes a control unit 12 that is a part in which the control unit 20 is stored and a detection unit 13 in which the detection unit 30 is stored.
In particular, in the detection unit 13, the plate having the support surface 13 a on which a writing sheet such as paper is placed is also configured to serve as the surface layer plate 31 of the detection means 30. The surface layer plate 31 will be described in detail later.

The control means 20 has a control circuit board connected to the detection means 30. This circuit includes, for example, a control unit and a communication unit. The control unit has a CPU (Central Processing Unit) and controls the entire writing board 10. The control unit is provided with a ROM (Read Only Memory) and a RAM (Random Access Memory) as required, and a program stored in the ROM is expanded in the RAM and the program is executed by the CPU. Good.
The program stored in the ROM determines the use of the pencil and the eraser based on the signal from the touch panel sensor 30 and the signal from the pressure-sensitive sensor 41 included in the detection means 30, and the position used. A program for calculating the range and locus and obtaining written data and erasure data may be included.

  The communication unit is for communicating with an external device such as a computer or a display device, and has an interface device used for communication with the external device. As this interface device, a wired connection device for connection by a wired LAN (Local Area Network), a USB (Universal Serial Bus) connection, etc., and a wireless LAN, Bluetooth (registered trademark), NFC (Near Field Communication), A wireless connection device for performing connection by RFID (Radio Frequency Identification), infrared rays or the like can be exemplified.

  The writing board 10 has a power source (not shown) for supplying power to each part of the writing board 10. Examples of the power source include batteries such as lithium ion batteries and nickel metal hydride batteries. Further, the present invention is not limited to this, and an alternating current (AC) power source, a solar battery, or power supplied from a USB terminal may be used as the power source. The power source may be accommodated in either the control unit 20 or the detection unit 30. The power source may be configured as a separate body and connected to the control means 20 and the detection means 30.

  Next, the detection means 30 will be described. In this embodiment, as can be seen from FIG. 2, the detection means 30 includes a surface layer plate 31, a touch sensor 32, a shielding film 40, a pressure sensor 41, and a reinforcing plate 42 in order from the support surface 13 a side of the housing 11. Have.

In this embodiment, the surface layer plate 31 is a plate-like member configured to serve also as a part of the detection unit 13 of the housing 11 and is a light-transmitting layer that functions as a dielectric. The surface layer plate 31 functions as an input surface (touch surface, contact surface) for the detection unit 30. That is, an external conductor (for example, a writing instrument, a human finger, etc.) is brought into contact with (approached to) the surface layer plate 31 so that the touch sensor 32 detects and inputs information from the outside. For example, a general-purpose eraser) is pressed so as to press the pressure-sensitive sensor 41, and information from the outside is input. Therefore, the thickness of the surface layer plate 31 is not particularly limited, but is preferably 0.1 mm or more and 0.6 mm or less.
Further, as described above, the surface layer plate 31 also serves as a part of the housing 11 and forms the support surface 13a that supports the writing sheet.

  The support surface 13a of the surface plate 31 preferably has a hard coat property. Such a surface layer plate 31 can be produced, for example, by providing a hard coat layer 31b on a transparent support 31a formed of an acrylic resin or the like. This hard coat layer preferably has a hardness of “H” or more in a pencil hardness test (4.9 N load) defined by JIS K 5600-5-4: 1999. By setting the pencil hardness to “H” or higher, the scratch resistance of the surface layer plate 31 can be improved. Therefore, when the surface layer board 31 is scratched by the tip of a writing instrument or the like, it is possible to prevent the support surface 13a from being damaged. In addition, from the viewpoint of adhesion to the transparent support, toughness, and curl prevention, the upper limit of the pencil hardness of the hard coat layer 31b is preferably “4H”. That is, it is preferable that the hard coat layer 31b has a hardness of “H” or more and “4H” or less in a pencil hardness test (4.9 N load) defined by JIS K5600-5-4 (1999). Since the detection means 30 of the writing board 10 is repeatedly pressed and requires high adhesion and toughness, the hard coat layer 31b is detected by setting the upper limit of the pencil hardness of the hard coat layer 31b to “4H”. When used as a layer forming the support surface 13a of the means, a remarkable effect can be exhibited.

  As such a hard coat layer 31b, a layer of glass or resin can be used. For example, thermosetting resins such as fluororesins and silicon resins, ionizing radiation curable resins such as acrylic and epoxy resins that are cured by crosslinking reaction upon irradiation with ionizing radiation such as ultraviolet rays and electron beams, and ionizing radiation curable A resin obtained by adding a thermosetting resin such as a fluororesin or a silicon resin to the resin can be preferably used.

  Further, the hard coat layer 31b suppresses adhesion of graphite powder or ink from the written surface of the writing sheet, so-called setback, when the written writing sheet is turned over on the surface layer plate 31. It is preferred to use the material obtained. Furthermore, it is preferable to use a material that can be easily wiped off and removed, such as adhering graphite powder and ink, even if settling occurs.

  The hard coat layer 31b may be formed by applying a resin material on the transparent support 31a and curing it by heating, irradiation with ionizing radiation, or the like, or transparent a glass or resin sheet with an adhesive or an adhesive. You may affix on the support body 31a. When the surface layer plate 31 is formed by adhering a resin sheet to the transparent support 31a, for example, a transparent material obtained by applying a resin material on a support film and curing it by heating or irradiation with ionizing radiation is used. You may make it stick on the support body 31a.

  Such a surface layer plate 31 preferably has a thickness of 0.1 mm or more and 0.6 mm or less from the viewpoint of supporting the writing sheet and reducing the thickness of the detection means 30. Moreover, it is preferable that the hard coat layer 31b has a thickness of 1 μm or more and 20 μm or less from the viewpoint of ensuring hardness and thinning of the detection means.

  Next, the touch sensor 32 will be described. FIG. 3 is a plan view showing an example of the touch sensor 30, and FIG. 4 is a partially enlarged view of the touch sensor 30 of FIG. 3 and shows a conductive mesh 36 of the touch sensor 30.

  The touch sensor 32 is configured as a projection-type capacitive coupling method, and is configured to be able to detect a contact position of an external conductor (for example, a writing instrument, a human finger). In the capacitive coupling method, when the detection sensitivity is excellent, it is possible to detect which region of the detection means 30 the outer conductor is approaching simply by approaching the detection means 30. it can. Along with such a phenomenon, the “contact position” is a concept including an approach position that is not actually in contact but can be detected.

  The terms “capacitive coupling” and “projection type” capacitive coupling have the same meaning as that used in the technical field of touch sensors, and are used in this case. The “capacitive coupling” method is also called “capacitance” method, “capacitance coupling” method, etc. in the technical field of touch sensors. It is treated as a term synonymous with the “capacitive coupling” method. A typical capacitive coupling type touch sensor includes an electrode (conductor layer). When an external conductor comes into contact with the touch sensor, the external conductor and the electrode (conductor layer) of the touch sensor are connected. A capacitor (capacitance) is formed between them. Based on the change in the electrical state accompanying the formation of the capacitor, the position coordinates of the position where the external conductor is in contact (approaching) on the touch sensor are specified (position detection).

  The touch sensor 32 includes a support film 33, a first electrode (detection electrode) 34, a second electrode (detection electrode) 35, a first extraction wiring 34b, and a second extraction wiring 35b. In the example shown in FIGS. 2 to 4, the touch sensor 32 has a first electrode 34, a second electrode 35, a first extraction wiring 34 b, and a second extraction wiring 35 b on one surface of the support film 33. doing.

  Further, the touch sensor is not limited to this, and the touch sensor has the first electrode and the first extraction wiring on one surface of the support film, and the second electrode and the second extraction wiring on the other surface. Also good. Or you may laminate | stack the touch sensor which has the 1st electrode and the 1st extraction wiring on the support film, and the touch sensor which has the 2nd electrode and the 2nd extraction wiring on the other support film. .

  In the example shown in FIGS. 2 to 4, the support film 33 supports the electrodes 34 and 35 and the extraction wirings 34 b and 35 b and can also function as a dielectric in the touch sensor 32. As illustrated in FIGS. 3 and 4, the support film 33 includes an active area Aa1 corresponding to an area where the touch position can be detected, and an inactive area Aa2 adjacent to the active area Aa1.

  The support film 33 is made of, for example, a polyester resin such as polyethylene terephthalate or polyethylene naphthalate, an acrylic resin such as polymethyl methacrylate, a polyolefin resin such as polypropylene, a cellulose resin such as triacetyl cellulose (cellulose triacetate), a polycarbonate resin, or the like. A material that can function as a dielectric, such as a resin sheet, an inorganic material made of glass, ceramics, or the like, can be used. Further, from the viewpoint of retaining the electrodes 34 and 35 and the extraction wirings 34b and 35b and reducing the thickness of the detection means 30, the thickness of the support film 33 can be set to 20 μm or more and 200 μm or less.

  As shown in FIG. 3, the first electrode 34 includes a plurality of first detection electrodes 34a used for position detection and disposed in the active area Aa1. In the illustrated example, the first electrode 34 includes a plurality of first detection electrodes 34 a extending along the first direction (X) of the support film 33 and arranged along the second direction (Y). . The second electrode 35 includes a plurality of second detection electrodes 35a used for position detection and disposed in the active area Aa1. In the illustrated example, the second electrode 35 includes a plurality of second detection electrodes 35 a extending along the second direction (Y) of the base film 33 and arranged along the first direction (X). Yes. As an example, each of the detection electrodes 34a and 35a is formed by a conductive mesh 36 made of a conductive thin wire 37 as described below. In FIG. A region where 35a is arranged is indicated by a simple rectangle. 3 and 4, in order to distinguish the first electrode 34 and the first extraction wiring 34b from the second electrode 35 and the second extraction wiring 35b for easy understanding, the first electrode 34 and the first extraction wiring 35b are used. The wiring 34b is indicated by a solid line, and the second electrode 35 and the second extraction wiring 35b are indicated by a broken line.

  The detection electrodes 34a and 35a are provided to detect an electromagnetic change or a change in capacitance that occurs when the outer conductor approaches the detection means 30. The detection electrodes 34a and 35a can be made of, for example, a conductive mesh 36 made of a thin conductive wire 37 made of a metal material with a predetermined line width and thickness. The detection electrodes 32a and 33a may be formed using a transparent conductive film such as ITO (indium tin oxide).

  One or two extraction wirings 34b and 35b are provided for each of the detection electrodes 34a and 35a depending on the detection method of the contact position. Each extraction wiring 34b, 35b is connected to the corresponding detection electrode 34a, 35a to form a wiring. In the example shown in FIG. 3, the extraction wirings 34 b and 35 b extend from the corresponding detection electrodes 34 a and 35 a to the vicinity of the edge of the support film 33 in the inactive area Aa <b> 2 of the support film 33. In the illustrated example, the extraction wirings 34b and 35b include terminal portions 34c and 35c that are connected to the above-described control unit via a connection wiring (for example, a flexible printed circuit board) (not illustrated).

  In the example shown in FIG. 4, the electrodes 34 and 35 each include a conductive mesh 36. In the illustrated example, each of the detection electrodes 34 a and 35 a includes a conductive mesh 36. The conductive mesh 36 is a lattice-like (mesh-like) material in which a large number of open regions 38 are defined by a large number of conductive thin wires 37. In the illustrated example, the conductive mesh 36 is formed as a grid-like mesh with a large number of conductive thin wires 37, thereby defining a large number of rectangular opening regions 38.

  The electrodes 34 and 35 and the extraction wirings 34b and 35b as described above are formed by, for example, vapor deposition, sputtering, foil transfer, coating, etc., gold, silver, copper, platinum, tin, aluminum, chromium, molybdenum, A metal film containing one or more of nickel, titanium, palladium, indium, and an alloy containing one or more of these metals is formed on the support film 33, and the metal film is formed by etching in a desired pattern. can do.

Next, the shielding film 40 will be described. The shielding film 40 prevents the noise from the pressure sensor 41 from affecting the touch sensor 30. Therefore, it is sufficient that such noise can be shielded. Examples thereof include conductive plastics, transparent conductive films such as ITO (indium tin oxide), and silver nanowire transparent conductive films.
Since the thickness of the shielding film 40 should just be able to shield a noise as mentioned above, what is necessary is just the thickness for it. For that purpose, the preferable thickness of the shielding film is 20 μm or more and 100 μm or less. In particular, the shielding film is composed of a shielding layer and a base film, and the preferred thickness of the shielding layer is 0.1 μm or more and 10 μm or less.

Next, the pressure sensitive sensor 41 will be described. The pressure-sensitive sensor 41 is a sensor that detects that the pressure sensor 41 is pressed and the position where the pressure sensor 41 is pressed. Thereby, as will be shown later, it is possible to detect that a general-purpose eraser has been used and to recognize which position has been erased and use it as data.
The pressure-sensitive sensor 41 is not particularly limited, and a general-purpose pressure-sensitive sensor can be applied.

  The reinforcing plate 42 is a plate-like member that reinforces the strength of the detection means 30. Accordingly, the material and thickness of the detecting means 30 are not particularly limited as long as the necessary strength is given to the detecting means 30.

  In the detection means 30 as described above, the touch sensor 32 must be disposed closer to the support surface 13a than the pressure-sensitive sensor 41 with the shielding film 40 interposed therebetween. If this is reversed, the touch sensor 32 cannot be detected by the shielding film 40.

  By connecting a display device such as a liquid crystal display to the writing board 10 via the communication unit described above, the writing content on the writing sheet placed on the support surface 13a of the writing board 10 is displayed on the display device. It is possible to construct a display system. In this display system, for example, the writing board 10 can be connected to the computer connected to the display device by wire or wirelessly, and the writing board 10 and the display device can be connected via the computer.

  Next, the operation of the writing board 10 will be described.

  FIG. 5 shows one scene where writing detection is performed by the writing board 10. At this time, when the control means 20 detects the external conductor 5 which is a conductive writing instrument such as a pencil in contact with or close to the support surface 13 a by the touch sensor 32, the touch sensor 32 detects the external conductor 5 on the support surface 13 a of the external conductor 5. Are continuously detected, and data of the trajectory of the movement of the outer conductor 5 is acquired. For example, when the writing sheet 1 is placed on the support surface 13 a of the detection unit 30 and characters or figures are written on the writing sheet 1 with the writing tool (external conductor) 5, the movement path of the writing tool 5 with the touch sensor 32. Get the data. When the writing board 10 is connected to the display device, the data written on the writing sheet 1 with the writing tool 5 is transmitted by transmitting the movement locus data of the writing tool 5 to the display device in real time (real time processing). It is displayed on the display device. Further, data of the locus of movement of the writing instrument 5 may be stored in a storage device such as a flash memory.

  As the writing sheet 1, any insulating sheet such as paper can be used. Commercially available paper can be used. In addition, the whole writing sheet 1 does not need to be insulating, and a part of the writing sheet 1 may have conductivity. In FIG. 5, for ease of viewing, the writing sheet 1 appears away from the support surface 13a in the same manner as the other layers. However, the writing sheet 1 is actually placed in contact with the support surface 13a. Yes.

As the writing instrument 5, a writing instrument having a conductor that can be detected by the touch sensor 32 at or near the leading end that contacts the writing sheet 1 can be used. The touch sensor 32 can detect the conductor provided in the tip part of the writing instrument 5 or in the vicinity of the tip part, and acquire the movement locus of the writing instrument 5.
Here, “near the tip” refers to a range within 5 mm from the tip of the writing instrument. Examples of the writing instrument 5 having a conductor at the tip can include a pencil, a ballpoint pen, a fountain pen, and the like. The pencil has a core made of graphite at the tip, and this core forms a conductor. In other words, since the lead of the pencil and the lead of the mechanical pencil are conductors, writing tools that are normally used by children, students, and students can be used as usual in the educational setting. In a ballpoint pen or fountain pen having a metal member at the tip, this metal member serves as a conductor. As the writing instrument 5 having a conductor in the vicinity of the tip, various writing instruments having a metal member in the vicinity of the tip can be suitably used.

  When the touch sensor 32 is detecting in this way, the pressure sensing sensor 41 may be programmed in advance so that the control means 20 ignores the pressure even if the pressure is detected. Thereby, malfunction can be prevented.

FIG. 6 shows one scene where erasure detection is performed by the writing board 10. At this time, when the control means 20 detects that the pressure sensor 41 has pressed the support surface 13a without the touch sensor 32 detecting anything, the pressure sensor 41 detects the external nonconductor 6. The position on the support surface 13a is continuously detected, and the movement locus data of the external nonconductor 6 is acquired. Then, the character or figure data recorded in advance on the movement locus is deleted. For example, when the writing sheet 1 is placed on the support surface 13 a of the detecting means 30 and characters or figures drawn on the writing sheet 1 are erased by the erasing tool (external nonconductor) 6, the pressure-sensitive sensor 41. The data of the locus of movement of the eraser 6 is acquired by. Then, the character or graphic data drawn in advance at this position is deleted.
When the writing board 10 is connected to the display device, data on the locus of movement of the eraser 6 is transmitted to the display device in real time (real-time processing), so that the eraser 6 applies the writing sheet 1 to the writing sheet 1. The written content is erased and displayed on the display device. Further, data of the locus of movement of the eraser 6 may be stored in a storage device such as a flash memory.

As the erasing tool 6, an erasing tool having a nonconductive conductor at the tip that contacts the writing sheet 1 can be used. In such an erasing tool, the touch sensor 32 presses the pressure-sensitive sensor 41 without detecting it. As a result, the pressure-sensitive sensor 41 can acquire the locus of movement of the eraser 6.
A general-purpose eraser can be exemplified as the eraser 6 having a nonconductor at the tip.

The calculation and the control of each member based on the result are performed by the control means 20. That is, according to the writing board 10, it is possible to convert the final writing result into data using a general-purpose pencil and a general-purpose eraser. Even if the eraser is erased by the eraser during the writing process, the eraser can be detected and appropriately reflected in the data. And if you draw letters and figures again with a pencil, it will be reflected.
The writing board 10 automatically determines whether to use a pencil or an eraser without relying on the user. Therefore, the user only has to write in the same way as normal writing, and there is no need for an additional operation by using the writing boat 10, which is highly convenient.

Although such a writing board 10 can be used in various scenes, it is particularly effective for educational purposes, for example. In the education field, drawing of characters and figures with a pencil and erasing of errors with an eraser are still usual, and there are many cases where it is not always possible to use a dedicated instrument. According to the present invention, for example, in the creation of answers on paper such as a collection of questions, children, students, and students (sometimes referred to as “children”) may normally prepare an answer with a pencil and an eraser. Can be reduced. Therefore, since the children need only visually recognize the information with characters and figures appearing on the paper, there is no sense of incongruity.
The content written on the paper by the student on the support surface 13a of the writing board 10 can be displayed on a display device such as a screen or a display. By displaying each student's answer to a paper-printed assignment (exam) on the teacher's display, you can monitor the progress of each student's assignment and score in real time as the assignment progresses. It becomes possible to do.

1 Written sheet 5 External conductor (writing instrument)
6 External non-conductor (eraser)
DESCRIPTION OF SYMBOLS 10 Writing board 11 Housing | casing 12 Control part 13 Detection part 13a Support surface 20 Control means 30 Detection means 31 Surface layer board 32 Touch sensor 33 Support film 34 1st electrode (detection electrode)
35 Second electrode (detection electrode)
40 Shielding film 41 Pressure sensitive sensor 42 Reinforcing plate

Claims (3)

A surface layer plate forming a support surface for supporting the writing sheet;
A touch sensor that is stacked on the surface layer plate and detects a contact position or an approach position of an external conductor on the support surface;
A shielding film disposed on the side opposite to the surface layer plate of the touch sensor;
A writing board comprising: a pressure-sensitive sensor disposed on the opposite side of the shielding film from the touch sensor. It further comprises control means for receiving a detection signal from the touch sensor and the pressure sensor and performing arithmetic processing,
In the control means,
Judging that writing was made when detection by the touch sensor was performed,
An operation is performed to determine that the erasure has been made when the detection by the pressure sensor is performed without the detection by the touch sensor.
The writing board according to claim 1. The writing board according to claim 1 or 2,
And a display device connected to the writing board and displaying the writing content.

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