JP2017157174A - Writing board and display system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a writing board which makes input trajectories viewable and performs handwriting input to a computer and the like even with an ordinary pencil and eraser, and to provide a display system having the same.SOLUTION: The writing board comprises: a surface layer board that forms a support surface 13a for supporting a writing sheet; a touch sensor laminated on the surface layer board and configured to detect a touch position or approach position of an external conductive body (writing tool) on the support surface; a pressure-sensitive sensor; and a writing sheet detection sensor 45 configured to detect a writing sheet placed on the support surface.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 Documents 1 to 4 show an apparatus for supporting handwriting input, which includes means for detecting an input position and means for indicating a position having a pen tip for performing the position input. Yes.

JP 2010-117943 A JP 7-501638 A Japanese Patent No. 4629306 Japanese Patent No. 3877484

  There is a desire to use such a device that supports handwriting input in educational sites such as elementary schools, junior high schools, and high schools. However, 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 in an educational field. However, the conventional handwriting input support device as described above cannot properly recognize input and erasure by a general-purpose pencil and eraser.

  Further, in the conventional apparatus, a dedicated pen (pen-type position indicator) for inputting to the input surface of the position detection apparatus is required. 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 is increased. There is also a problem that the handwriting input support device cannot be used if the dedicated pen is lost.

  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.

  One aspect of the present invention includes a surface layer plate that forms a support surface that supports 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, It is a writing board provided with a sensor and a writing sheet detection sensor for detecting that the writing sheet is placed on the support surface.

  In this writing board, a shielding film may be disposed on the opposite side of the touch sensor from the surface layer plate.

  The writing board further includes a calculation unit that receives detection signals from the touch sensor, the pressure sensor, and the writing sheet detection sensor and performs calculation processing. When the detection is performed by the touch sensor in the calculation unit It can be determined that writing has been made, and an operation is performed to determine that erasing has been performed when detection by the pressure sensor is performed without detection by the touch sensor.

  In the above calculation means, it is possible to determine that writing has been performed when detection is performed by the touch sensor after the writing sheet is detected by the writing sheet detection sensor.

  In the writing boat, the touch sensor may also serve as a writing sheet detection sensor.

  The writing board may further include the writing sheet placed on a support surface.

  A display system comprising the above writing board and a display device that is connected to the writing board and displays writing contents can be provided.

  According to the present invention, after automatically detecting a writing sheet such as paper, the input trajectory can visually recognize writing with a normal pencil on a writing sheet such as paper. Since it is possible to distinguish and recognize the erased characters by the eraser, it is possible to perform appropriate handwriting input to a computer or the like.

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. 5A shows an example of the first detection electrode 34a, FIG. 5B shows an example of the second detection electrode 35a, and FIG. 5C shows both the first detection electrode 34a and the second detection electrode 35a. FIG. 6A shows an example of the first detection electrode 34a, FIG. 6B shows an example of the second detection electrode 35a, and FIG. 6C shows both the first detection electrode 34a and the second detection electrode 35a. FIG. 7A shows an example of the first detection electrode 34a, FIG. 7B shows an example of the second detection electrode 35a, and FIG. 7C shows both the first detection electrode 34a and the second detection electrode 35a. FIG. 8A shows an example of the first detection electrode 34a, FIG. 8B shows an example of the second detection electrode 35a, and FIG. 8C shows both the first detection electrode 34a and the second detection electrode 35a. FIG. 9A shows an example of the first detection electrode 34a, FIG. 9B shows an example of the second detection electrode 35a, and FIG. 9C shows both the first detection electrode 34a and the second detection electrode 35a. FIG. 10A shows an example of the first detection electrode 34a, FIG. 10B shows an example of the second detection electrode 35a, and FIG. 10C shows both the first detection electrode 34a and the second detection electrode 35a. FIG. 11A shows an example of the first detection electrode 34a, FIG. 11B shows an example of the second detection electrode 35a, and FIG. 11C shows both the first detection electrode 34a and the second detection electrode 35a. FIG. It is a figure explaining the scene of writing. It is a figure explaining the scene of the eraser by an eraser.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings attached to the 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 the actual mode.

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 configuration of the detection means 30. 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). This adhesive (optical glue) may be transparent or opaque.

  As can be seen from FIGS. 1A, 1 </ b> B, and 2, the writing boat 10 includes a housing 11, a calculation unit 20 that is housed inside the housing 11, and a detection unit 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.
Arithmetic means 20 and detection means 30 are housed inside the housing 11. Therefore, the housing 11 is also configured to include a control unit 12 that is a part in which the calculation 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 calculation 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 necessary, and a program stored in the ROM is expanded in the RAM, and this program is calculated and executed by the CPU. May be.
In the program stored in the ROM, the use of the pencil and the eraser are determined based on the signal from the touch sensor 32 and the signal from the pressure sensor 41 included in the detection means 30, and the used position, A program for calculating the range and locus and obtaining written data and erasure data may be included.
Further, this ROM has a program for receiving a signal from a writing sheet detecting means 45 for detecting the presence or absence of a writing sheet such as paper, determining the presence of the writing sheet, turning on / off the power, and performing other controls. 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 any of the calculation means 20 and the detection means 30. Further, the power source may be configured as a separate body and connected to the calculation 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. Further, the detection means 30 includes a writing sheet detection means 45.

In the present embodiment, the surface layer plate 31 is a plate-like member that is configured so that the housing 11 also serves as a part of the detection unit 13. The surface layer 31 may be transparent or opaque.
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 (approached) with the surface layer plate 31 to detect the touch sensor 32 and input information from the outside, and press the eraser against the surface layer plate 31. In this manner, the pressure-sensitive sensor 41 detects this and inputs information from the outside. Therefore, the thickness of the surface layer plate 31 is not particularly limited, but is preferably 0.1 mm or more and 1.5 mm or less. More desirably, the thickness is 0.1 mm or more and 0.6 mm or less. This is because the touch sensor does not respond, so the thickness of 0.1 mm is the lower limit value, and the touch sensor does not operate unless the thickness is 0.6 mm or less. If the sensitivity of the touch sensor is high, a thickness of 1.5 mm is possible.
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. The hard coat layer preferably has a hardness of “H” or higher 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, 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 can suppress adhesion of graphite powder, ink or the like from the written surface of the writing sheet, so-called back-inversion, when the written writing sheet is turned over on the surface layer plate 31. It is preferable to use a material. Furthermore, it is preferable to use a material that can be easily wiped off, such as adhering graphite powder and ink, even if back surface is generated.

  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 to 0.6 mm from the viewpoint of the mechanical strength of the surface plate and the sensitivity of various sensors. Moreover, it is preferable that the hard coat layer 31b has a thickness of 0.1 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 32, and FIG. 4 is a partially enlarged view of the touch sensor 32 of FIG. 3, showing a conductive mesh 36 of the touch sensor 32. As shown in FIG.

  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 amount of change in the electrical state that accompanies the formation of the capacitor, detection or non-detection is determined, and the position coordinate of the position where the external conductor is in contact (approaching) on the touch sensor is specified (position Detected).

  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 first electrode 34, the second electrode 35, the first extraction wiring 34 b, and the second extraction wiring 35 b, and is a dielectric in the touch sensor 32. It can also function as a body. 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. In addition, from the viewpoint of retaining the first electrode 34, the second electrode 35, the first extraction wiring 34b, and the second extraction wiring 35b, and reducing the thickness of the detection means 30, the thickness of the support film 33 is as follows. It can be 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, the first detection electrode 34a and the second detection electrode 35a are formed by a conductive mesh 36 composed of conductive thin wires 37 as described below. However, in FIG. A region where the first detection electrode 34a and the second detection electrode 35a are disposed 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 first detection electrode 34 a and the second detection electrode 35 a are provided for detecting an electromagnetic change or a change in capacitance that occurs when the outer conductor approaches the detection means 30. The first detection electrode 34a and the second detection electrode 35a can be constituted by, 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. However, the present invention is not limited to this, and the first detection electrode 34a and the second detection electrode 35a may be formed using a transparent conductive film such as ITO (indium tin oxide).

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

  In the example shown in FIG. 4, the first electrode 34 and the second electrode 35 each include a conductive mesh 36. In the illustrated example, each of the first detection electrode 34 a and the second detection electrode 35 a includes a conductive mesh 36. In this embodiment, 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 thin conductive 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. However, the pattern which the 1st sensing electrode and the 2nd sensing electrode have is not restricted to this, and various patterns can be applied so that required performance may be satisfied. 5 to 11 show pattern examples of the first detection electrode 34a and the second detection electrode 35a. Each of FIGS. 5 to 11 shows one unit of a repeated pattern. 5-11, this 1 unit of the 1st detection electrode 34a is repeated in the left-right direction of a paper surface, and it becomes a strip | belt shape, and this strip | belt shape is arranged in a paper surface up-down direction (refer FIG. 3). One unit of the second detection electrode 35b is repeated in the vertical direction on the paper surface to extend into a belt shape, and this belt shape is arranged in the horizontal direction on the paper surface (see FIG. 3). Each of FIGS. 5 to 11 shows three views (a), (b), and (c). 5 to 11, (a) represents only the first detection electrode 34 a, (b) represents only the second detection electrode 35 a, and (c) represents a scene in which both overlap in plan view. ing. The pattern will be described below.

In the example shown in FIG. 5, the first sensing electrode 34a has a rhombic thin film connected in the left-right direction by a connecting portion 34f (FIG. 5 (a)), and the second sensing electrode 35a has a rhomboid thin film connected in the vertical direction. It is the form (FIG.5 (b)) connected by 35f. As can be seen from FIG. 5 (c), the detection electrodes are arranged with no gap in appearance in plan view by overlapping each other. Further, the first detection electrode 34a and the second detection electrode 35a overlap each other at the connecting portions 34f and 35f. The sizes of the connecting portions 34f and 35f can be appropriately adjusted.
On the other hand, in the example shown in FIG. 6, as can be seen from FIG. 5C, when the first detection electrode 34a and the second detection electrode 35a overlap, a gap G1 is formed in a plan view. is there.

  In the example shown in FIG. 7, the first detection electrode 34 a has a thin line 37 formed in an oblique lattice shape (FIG. 7A), and the second detection electrode 35 a similarly forms the thin line 37 in an oblique lattice shape. (FIG. 7B). However, the second detection electrode 35a includes a space G2 in which a thin line is not formed. Then, as can be seen from FIG. 7C, only the first detection electrode 34a becomes the only part of the space G2 in plan view when they overlap each other.

  In the example shown in FIG. 8, the first detection electrodes 34 a are formed by forming thin lines 37 in an oblique lattice shape on the inner side of the rhombus, and the rhombuses are connected to each other by a connecting portion 34 f (FIG. 8A). The two detection electrodes 35a have a form in which thin wires 37 are formed in an oblique lattice shape inside the rhombus, and the rhombuses are connected in the vertical direction by a connecting portion 35f (FIG. 8B). As can be seen from FIG. 8 (c), the detection electrodes are arranged without any gap in plan view when they overlap. Further, the first detection electrode 34a and the second detection electrode 35a overlap each other at the connecting portions 34f and 35f. The sizes of the connecting portions 34f and 35f can be appropriately adjusted.

  In the example shown in FIG. 9, the first detection electrode 34a has a thin line 37 extending in the horizontal direction and formed in a striped shape (FIG. 9A), and the second detection electrode 35a has the thin line 37 perpendicular to the same. It extends in the direction and is formed in a striped shape (FIG. 9B). As can be seen from FIG. 9C, when they overlap, a lattice shape is obtained in plan view.

  In the example shown in FIG. 10, the first detection electrode 34a has a thin line 37 extending in the vertical direction and formed in a striped shape (FIG. 10A), and the second detection electrode 35a also has the thin line 37 parallel thereto. In FIG. 10B, it extends in the vertical direction. As can be seen from FIG. 10C, the two overlap, resulting in a striped shape in plan view.

  In the example shown in FIG. 11, the first detection electrode 34a is formed with a thin line 37 in an oblique lattice shape (FIG. 11A), and the second detection electrode 35a is similarly formed with a thin line 37 in an oblique lattice shape. (FIG. 11B). However, the pitch of the thin wires 37 is made finer in the second detection electrode 35a. As can be seen from FIG. 7C, the two layers overlap to form an oblique lattice shape even in plan view.

  As described above, the first detection electrode 34a, the second detection electrode 35a, the first extraction wiring 34b, and the second extraction wiring 35b are made of, for example, gold, by vapor deposition, sputtering, foil transfer, coating, or the like. A metal film containing one or more of silver, copper, platinum, tin, aluminum, chromium, molybdenum, nickel, titanium, palladium, indium, and an alloy containing one or more of these metals is formed on the support film 33. The metal film can be formed by etching with a desired pattern. In addition to the method of forming a pattern in a later step as described above, a technique based on gravure or screen printing using a plate on which a pattern has been previously formed is also possible.

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 32. 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. Transparent and opaque are not particularly limited.
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. Therefore, the preferable thickness of the shielding film is 20 μm or more and 200 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. As a result, as will be shown later, it is possible to detect that a general-purpose eraser has been used and to recognize at which position the eraser 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.

  The writing sheet detection unit 45 is a unit that detects that the writing sheet 1 such as paper (see FIG. 12) is placed on the support surface 13 a of the detection unit 13. If the writing sheet detecting means 45 can detect that the writing sheet is placed, its specific form is not particularly limited, and various sensors can be used. Therefore, the touch sensor 32 may also be used as the writing sheet detecting unit 45 by configuring the writing sheet 1 to be detected by the touch sensor 32 described above. In this case, for example, it can be determined that the writing sheet 1 is placed when a change in capacitance is detected in a large area. However, the writing sheet detecting means 45 may not be provided.

  By connecting a display device such as a display to the writing board 10 via the communication unit, 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. 12 shows one scene where writing detection is performed by the writing board 10.
When the writing sheet 1 is placed on the support surface 13a of the writing board 10, the writing sheet detecting means 45 detects it, and the calculating means 20 that has received the signal moves the writing board 10 from a pause state to an input waiting state. , Can input to the writing board. However, the present invention is not limited to this, and an electrical switch can be provided.
As the writing sheet 1, any non-conductive 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 a nonconductor, and a part of the writing sheet 1 may have electroconductivity.
In FIG. 12, 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.
In addition, by providing a bar code reader in the writing sheet detecting means 45, the writing sheet can be identified on the writing board according to the bar code previously given to the writing sheet. Is possible.

  After that, when the calculation means 20 detects the external conductor 5 that 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. The position is continuously detected, and the data of the locus of movement of the external 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 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. In this case, if a writing instrument is provided with ink that can be erased with an eraser, it is possible to detect the eraser with an eraser.

  When the touch sensor 32 is detecting in this way, the pressure sensor 41 may be programmed in advance so as to ignore the pressure even if the pressure sensor 41 detects the pressure. Thereby, malfunction can be prevented.

FIG. 13 shows one scene where the eraser detection by the eraser is performed by the writing board 10. At this time, in the calculation means 20, when the pressure sensor 41 detects that the support surface 13 a is pressed without detecting anything by the touch sensor 32, the pressure sensor 41 supports the eraser 6 support surface. The position on 13a is continuously detected, and the movement locus data of the eraser 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 eraser 6, the pressure-sensitive sensor 41 moves the locus of the eraser 6. Get the data. 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, the movement locus data of the eraser 6 is transmitted to the display device in real time (real time processing), so that the writing sheet 10 is written on the writing sheet 1 with the eraser 6. It is displayed on the display device with the contents erased. Further, the data of the locus of movement of the eraser 6 may be stored in a storage device such as a flash memory.

  In such an eraser 6, the touch sensor 32 presses the pressure sensor 41 without detecting it. As a result, the pressure-sensitive sensor 41 can acquire the locus of movement of the eraser 6.

The calculation as described above and the control of each member based on the result are performed by the calculation means 20. That is, according to the writing board 10, it is possible to detect that a writing sheet such as paper has been placed and to convert the final result of writing into data using a general-purpose pencil and a general-purpose eraser.
Even if the eraser is erased during the writing process, the eraser by 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.
Moreover, you may comprise so that it may be in a resting state by removing a writing sheet, such as paper, after use is complete | finished. Thereby, the convenience can be further enhanced.

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 Eraser 10 Writing board 11 Housing 12 Control unit 13 Detection unit 13a Support surface 20 Calculation unit 30 Detection unit 31 Surface layer plate 32 Touch sensor 33 Support film 34 First electrode (detection electrode)
35 Second electrode (detection electrode)
40 Shielding film 41 Pressure sensor 42 Reinforcing plate 45 Written sheet detecting means

Claims (7)

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 pressure sensor,
A writing board comprising: a writing sheet detection sensor that detects that the writing sheet is placed on the support surface.   The writing board according to claim 1, wherein a shielding film is disposed on the opposite side of the touch sensor from the surface layer board. Receiving a detection signal from the touch sensor, the pressure sensor, and the writing sheet detection sensor, further comprising a calculation means for performing a calculation process,
In the calculation 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 or 2.   The writing board according to claim 3, wherein the calculation means determines that writing has been performed when detection by the touch sensor is performed after the writing sheet detection sensor detects the writing sheet.   The writing board according to claim 1, wherein the touch sensor also serves as the writing sheet detection sensor.   The writing board according to claim 1, further comprising the writing sheet placed on the support surface. The writing board according to claim 1;
And a display device connected to the writing board and displaying the writing content.

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