JP2018041430A - Handwriting input device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a handwriting input device capable of suppressing an unlawful input.SOLUTION: A handwriting input device (1) is the handwriting input device capable of acquiring handwritten data of an electronic pen on a coordinate detection surface (2a) of a coordinate input device by an electromagnetic induction action between a coordinate input device (2) and an electronic pen (3). The electronic pen includes: a first resonance circuit (40) having a coil, a capacitance, and a core; a sharp pencil unit capable of writing on a paper placed on the coordinate detection surface; and a writing pressure detection part(45) capable of detecting a writing pressure with a part of the sharp pencil pressed. With the writing pressure detected, while writing on the paper by the electronic pen, the written data corresponding to the writing on the paper is acquired by the coordinate input device.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a handwriting input device that includes a coordinate input device and an electronic pen and uses a coordinate detection method based on electromagnetic induction.

  In recent years, by adding a writing unit to an electronic pen and placing the paper on the coordinate detection surface of the coordinate input device, handwriting input can be performed simultaneously with writing on the paper and input to the coordinate input device. The device is known.

  The following Patent Document 1 and Patent Document 2 disclose the structure of an electronic pen provided with a writing unit.

Japanese Patent No. 2717774 Japanese Patent No. 4119174

  The electronic pens disclosed in Patent Literature 1 and Patent Literature 2 both have a writing pressure detection function. Here, the electronic pens described in Patent Literature 1 and Patent Literature 2 are configured such that when the writing pressure is received, the entire writing unit receives the pressing force and moves backward. For this reason, even when the lead does not come out of the pen tip, the writing pressure is detected when the writing unit receives a pressing force. Therefore, although it is not actually written on the paper (although nothing is written on the paper), an illegal input for acquiring handwriting data occurs on the coordinate input device side.

  The present invention has been made in view of such problems, and an object thereof is to provide a handwriting input device capable of suppressing unauthorized input.

  The handwriting input device of the present invention is a handwriting input device capable of acquiring handwriting data of the electronic pen on a coordinate detection surface of the coordinate input device by electromagnetic induction action of the coordinate input device and the electronic pen, The electronic pen includes a resonance circuit including a coil, a capacitor, and a core, a mechanical pencil unit capable of writing on a sheet placed on the coordinate detection surface, and a writing pressure applied to a core protruding from the tip of the mechanical pencil unit. In response, a part of the mechanical pencil unit is pressed to provide a writing pressure detection unit capable of detecting the writing pressure. When the writing pressure is detected, the electronic pen The handwriting data corresponding to the handwriting on the paper is acquired by the coordinate input device while writing on the paper.

  According to the above handwriting input device, when the lead protruding from the tip of the mechanical pencil unit is pressed by the writing pressure, a part of the mechanical pencil unit receives the pressing force together with the lead, and the writing pressure is detected by the writing pressure detection unit. This is a detected configuration. As described above, a part of the mechanical pencil unit receives a pressing force when the lead protrudes from the tip. In a state where the lead does not protrude from the tip, a part of the mechanical pencil unit applies the pressing force. No writing pressure is detected. Therefore, according to the present invention, it is possible to suppress unauthorized input such as handwriting data being acquired on the coordinate input device side even though it is not written on the paper, and the handwriting written on the paper and the coordinate input device Consistency with handwriting data can be improved.

  Further, in the handwriting input device, a lead feeding portion that allows the lead to be drawn out from a tip of the mechanical pencil unit is provided inside the electronic pen so as to be able to advance and retreat. When the pen pressure is received in a state where the lead protrudes from the tip of the mechanical pencil unit, the lead can be retracted in the axial direction together with the lead, and the lead feeding portion is moved by the writing pressure. It is preferable that the writing pressure detection unit operates.

  As a result, the lead feeding portion does not move inside the electronic pen even when the writing pressure is received in a state where the lead does not protrude. Therefore, it is possible to prevent the handwriting data from being acquired without detecting the writing pressure in a state where the core is not formed. On the other hand, in a state where the lead protrudes from the tip of the mechanical pencil unit, the lead feeding portion receives the writing pressure and moves the inside of the electronic pen backward in the axial direction. In response to the movement of the lead feeding unit, the writing pressure detection unit operates, and writing coordinate data can be acquired simultaneously with writing on the paper.

  Further, according to the handwriting input device, a cylindrical shaft tube is fixedly disposed inside the electronic pen, and the lead feeding portion is inserted on a tip side of the shaft tube. In the lead feeding portion, a flange facing the tip surface is provided in front of the tip surface of the shaft tube, and the writing pressure detection unit is provided on one of the flange and the tip surface. And it is preferable that the said pen pressure detection part is pressed by the said front end surface or the said flange, and the said pen pressure is detected.

  In this invention, it can be set as the structure by which a writing pressure detection part is pressed by making the flange of the core supply | feeding-out part which can advance / retreat contact with the front end surface of the axial cylinder of a fixed side, receiving a writing pressure. Accordingly, the pen pressure can be detected accurately and with a simple configuration using the shaft cylinder fixed inside the electronic pen. Moreover, according to this invention, a pen pressure detection part can be arrange | positioned in the front side of a mechanical pencil unit, pen pressure detection can be performed, and the responsiveness of pen pressure detection can be made favorable.

  Moreover, according to said handwriting input device, it is preferable that the shock absorbing material is arrange | positioned in a part of circumference | surroundings of the said core supply part. Thereby, generation | occurrence | production of the abnormal noise based on the advancing / retreating movement of a core supply part can be suppressed. In addition, the lead feeding portion can have a slight resistance so that it does not rapidly advance and retreat with or without writing pressure. Thereby, the writing comfort with an electronic pen can be made favorable.

  Moreover, according to said handwriting input device, it is preferable that the moving amount | distance of the said core extension part by pen pressure is 0 mm or more and 0.5 mm or less. Thus, by reducing the movement amount, it is possible to improve the writing comfort with the electronic pen. It can also be detected with low writing pressure.

  Moreover, according to said handwriting input device, it is preferable that the said pen pressure detection part is comprised with a pressure sensor. As described above, by using the pressure-sensitive sensor, a thin sensor can be configured and can be appropriately arranged inside the electronic pen. Moreover, by using a pressure sensor, pressurization sensing property can be improved and pen pressure can be detected with high accuracy.

  According to the handwriting input device, the coordinate input device is provided with a fixing portion for fixing the paper on the coordinate detection surface, and the presence or absence of the paper can be detected by the fixing portion. If it is determined that there is no paper, the acquisition of the handwriting data is preferably stopped. Thus, even if writing is performed in a state where no paper is set on the coordinate detection surface, acquisition of handwriting data is stopped, so that a state where there is no paper can be appropriately suppressed as an illegal input.

  Further, according to the handwriting input device, the coordinate input device is provided with a misalignment detection unit that detects whether or not the paper is arranged at a predetermined position on the coordinate detection surface, and the misalignment is detected. When the detection unit determines that the paper is not arranged at a predetermined position, it is preferable that acquisition of the handwriting data is stopped. As described above, even if the handwriting is performed in a state where the paper is misaligned, the acquisition of the handwriting data is stopped. Therefore, the state where the paper misalignment occurs can be appropriately suppressed as an illegal input.

  According to the present invention, it is possible to suppress unauthorized input such that handwriting data is acquired on the coordinate input device side even though it is not written on paper, and the handwriting written on the paper and the handwriting data acquired by the coordinate input device. And consistency can be improved.

It is a schematic diagram of the handwriting input device in this Embodiment. It is a block diagram of the handwriting input device in this Embodiment. 3A is a plan view of the electronic pen in the present embodiment, and FIG. 3B is a cross-sectional view of the electronic pen shown in FIG. 3A. 4A is a partially enlarged cross-sectional view of the electronic pen of the present embodiment in a non-writing state, and FIG. 4B is a partially enlarged cross-sectional view of the electronic pen of the present embodiment in a state where writing pressure is applied to the core. . It is sectional drawing of the electronic pen which shows the non-writing state of this Embodiment different from FIG. FIG. 6 is a partial enlarged cross-sectional view of the electronic pen shown in FIG. 5. 6 is a cross-sectional view showing a state in which the electronic pen of FIG. It is sectional drawing which shows the writing state of the electronic pen shown in FIG. FIG. 6 is a cross-sectional view showing a state where writing pressure is applied to the core in the electronic pen of FIG. 5. FIG. 10A is a plan view of the electronic eraser in the present embodiment, and FIG. 10B is a cross-sectional view of the electronic eraser shown in FIG. 10A. FIG. 11A is a plan view of an electronic eraser in an embodiment different from FIG. 10, and FIG. 11B is a cross-sectional view of the electronic eraser shown in FIG. 11A. FIG. 12A is a plan view of an electronic eraser in an embodiment different from FIGS. 10 and 11, and FIG. 12B is a cross-sectional view of the electronic eraser shown in FIG. 12A.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a schematic diagram of a handwriting input device according to the present embodiment. FIG. 2 is a block diagram of the handwriting input device according to the present embodiment. 3A is a plan view of the electronic pen in the present embodiment, and FIG. 3B is a cross-sectional view of the electronic pen shown in FIG. 3A. 4A is a partially enlarged cross-sectional view of the electronic pen of the present embodiment in a non-writing state, and FIG. 4B is a partially enlarged cross-sectional view of the electronic pen of the present embodiment in a state where writing pressure is applied to the core. . FIG. 5 is a cross-sectional view of the electronic pen showing the non-writing state of the present embodiment different from FIG. 6 is a partially enlarged cross-sectional view of the electronic pen shown in FIG. FIG. 7 is a cross-sectional view illustrating a state where the electronic pen of FIG. FIG. 8 is a cross-sectional view showing a writing state of the electronic pen shown in FIG. FIG. 9 is a cross-sectional view showing a state in which writing pressure is applied to the core in the electronic pen of FIG. FIG. 10A is a plan view of the electronic eraser in the present embodiment, and FIG. 10B is a cross-sectional view of the electronic eraser shown in FIG. 10A. FIG. 11A is a plan view of an electronic eraser in an embodiment different from FIG. 10, and FIG. 11B is a cross-sectional view of the electronic eraser shown in FIG. 11A. FIG. 12A is a plan view of an electronic eraser in an embodiment different from FIGS. 10 and 11, and FIG. 12B is a cross-sectional view of the electronic eraser shown in FIG. 12A.

  In this specification, “writing” refers to writing characters and pictures on paper with a mechanical pencil core, and “handwriting” refers to characters and pictures written on paper 7. . In the electronic pens 3 and 4, “front” refers to the side (X1 side) from which the core protrudes from the tip, and “rearward” refers to the opposite side (X2 side). In the electronic eraser 5, “front” refers to the side where the eraser 51 exists and erases characters and the like written on the paper 7 (X1 side), and “rear” refers to the opposite side (X2). Side).

  As shown in FIG. 1, the handwriting input device 1 includes a coordinate input device 2, an electronic pen 3, and an electronic eraser 5. In the present embodiment, the coordinate input device 2 and the electronic pen 3 are indispensable components, but the electronic eraser 5 is selectable and may be omitted.

  The handwriting input device 1 shown in FIG. 1 is on the coordinate detection surface 2a (see FIGS. 1 and 2) of the coordinate input device 2 by the electromagnetic induction action of the coordinate input device 2, the electronic pen 3 and the electronic eraser 5. This is an electromagnetic induction type digitizer capable of acquiring each coordinate data (input position information) of the electronic pen 3 and the electronic eraser 5.

(Coordinate input device)
The coordinate input device 2 is a digitizer body including a coordinate detection surface 2a, and a plurality of antenna coils (not shown) are arranged in parallel in a two-dimensional direction orthogonal to each other inside the coordinate detection surface 2a. In the coordinate input device 2, the antenna coil is sequentially switched to scan the coordinate detection surface 2a. At this time, the strongest signal is generated from the antenna coil closest to the electronic pen 3 on the coordinate detection surface 2a. Based on this signal, coordinate data on the coordinate detection surface 2a of the electronic pen 3 can be calculated by the control unit 2b of the coordinate input device 2 shown in FIG. Similarly, the coordinate data on the coordinate detection surface 2a of the electronic eraser 5 can be calculated by the control unit 2b shown in FIG.

  The coordinate data calculated by the control unit 2b is recorded by the recording unit 2c shown in FIG. Further, the coordinate data can be transmitted from the transmission unit 2d to the display device 6 such as a personal computer or a portable terminal connected to the outside of the handwriting input device 1. The display device 6 can display the handwriting 9 written on the paper 7. The connection of the display device 6 is arbitrary.

(Electronic pen)
The configuration of the electronic pen 3 will be described mainly with reference to FIGS. As shown in FIGS. 3A and 3B, the outline of the electronic pen 3 includes a shaft cylinder 30 composed of a front shaft 30a and a rear shaft 30b, a grip 31 positioned on the outer periphery of the front shaft 30a, and a front shaft 30a. It has a base 32 positioned on the front side (X1 side shown in FIG. 3B) and a knock part 33 positioned on the rear side (X2 side in FIG. 3B) of the rear shaft 30b.

  As shown in FIG. 3B, a mechanical pencil unit 34 is disposed inside the electronic pen 3 as a writing unit. Therefore, as shown in FIG. 1, writing can be performed using the electronic pen 3 on the paper 7 placed on the coordinate detection surface 2a. As long as “paper” can be written with the core 8 of the mechanical pencil unit 34, the material of the “paper” does not matter. Hereinafter, the mechanical pencil unit 34 provided in the electronic pen 3 will be described in detail.

  The mechanical pencil unit 34 accommodates the core 8 except for a resonance circuit 40, a writing pressure detection unit 45, a shaft 30 as an outer shell, and a grip 31, which will be described later. The whole mechanism part sent out forward from the front-end | tip part 32a is pointed out (refer FIG. 4B). Therefore, specifically, the mechanical pencil unit 34 in the present embodiment mainly includes a lead feeding portion 36 located inside the front shaft 30a from the tip portion 32a of the base 32, as shown in FIGS. 3B and 4A. The lead case 37 and the mechanism part reaching the knock part 33 disposed on the rear end side of the lead case 37 are provided.

  The base 32 has a hollow, substantially conical shape, and is integrally formed with a front end portion 32a protruding forward. The front end portion 32a is provided with a through hole having the same diameter as the core 8 shown in FIG. 4B. However, in the inside of the substantially conical shape on the rear end side from the front end portion 32a, the diameter of the hole communicating with the through hole is gradually increased. Has spread. In particular, a space is provided on the rear end side of the base 32 that faces a core feeding portion 36 (to be described later) in which the gripping portion 360 a of the chuck 360 constituting the core feeding portion 36 can enter. As shown in FIG. 4A, a holding chuck 35 is provided in the base 32 and at the rear end position of the front end portion 32a. Although the material of the base 32 is not limited, for example, ceramic, stainless steel, resin, and the like. The holding chuck 35 is preferably made of rubber.

  Next, the lead feeding part 36 will be described. As shown in FIG. 4A, the lead feeding portion 36 includes a chuck 360, a fastener 361, a joint 362, and a chuck spring 363 that connects the joint 362 and the lead case 37. . As shown in FIG. 4A, the core feeding portion 36 is inserted on the tip side (X1 side) of the tip shaft 30a.

  As shown in FIG. 4A, on the front side (X1 side) of the chuck 360, a plurality of (for example, three) gripping portions 360a are provided in the circumferential direction, and the gripping portion 360a is, for example, a ring shape made of brass. It fits in a state having play in a fastener 361 formed in the above.

  As shown in FIG. 4A, the chuck 360 is slidably mounted in the axial direction O (X1-X2 direction) inside a cylindrical joint 362 that covers the front periphery of the chuck 360, and the outer peripheral surface of the joint 362 Is located on the inner peripheral surface of the front portion of the front shaft 30a. Inside the front shaft 30a, a cushion spring 38 is provided between the rear end portion of the joint 362 and the inner peripheral end portion provided on the inner peripheral surface of the front shaft 30a facing the rear end portion. It is connected.

  In the front shaft 30 a, the rear end portion of the joint 362 and the front end portion of the core case 37 are connected by a coiled chuck spring 363.

  Holding the knock part 33 upward with the base 32 side of the electronic pen 3 facing downward and knocking the knock part 33 shown in FIG. 3 forward, the lead case 37 advances, the chuck spring 363 is compressed, and the chuck 360 moves forward. Thrust out. At this time, the divided gripping portion 360 a of the chuck 360 is opened, and the core 8 accommodated in the core case 37 falls by its own weight and passes through the chuck 360. The core 8 is prevented from dropping due to its own weight at the position of the holding chuck 35 provided inside the base 32. When the knock portion 33 is returned to the original position, the lead case 37 returns to the rear, and the grip portion 360 a of the chuck 360 is tightened with the fastener 361. Thereby, the core 8 is gripped by the gripping portion 360 a of the chuck 360. By repeating the knocking operation, the lead 8 gradually advances forward from the holding chuck 35 and gripped by the gripping portion 360a, and eventually the lead 8 protrudes forward from the tip 32a of the base 32. To do.

  As shown in FIG. 4A, the electronic pen 3 in the present embodiment includes a ferrite core 43 formed in a substantially cylindrical shape on the outer peripheral side of the front shaft 30a, and a coil 41 wound around the outer periphery of the ferrite core 43. And a capacitor 42 disposed on the rear shaft 30b side. The first resonance circuit 40 is provided.

  Moreover, the electronic pen 3 in the present embodiment includes a writing pressure detection unit 45 inside. As shown in FIG. 4A, in the present embodiment, the writing pressure detection unit 45 is provided on the front end surface 30a1 on the front side (X1 side) of the front shaft 30a. As shown in FIG. 4A, a flange 362a provided integrally with a joint 362 constituting the core feeding portion 36 is opposed to the front end surface 30a1 of the front shaft 30a. A stroke width S is provided between the writing pressure detector 45 provided on the tip surface 30a1 of the front shaft 30a and the flange 362a. The stroke width S is preferably 0 mm or more and 0.5 mm or less. When the stroke width S is 0 mm, the writing pressure detection unit 45 and the flange 362a are always kept in contact with each other.

  FIG. 4A shows a non-writing state where the lead 8 is not housed in the lead case 37 or the lead 8 does not protrude from the tip 32 a of the base 32 even if the lead 8 is housed in the lead case 37. . Even if writing is performed on the paper 7 shown in FIG. 1 using the electronic pen 3 in this non-writing state, the handwriting 9 by the core 8 does not remain on the paper 7 and the writing pressure detection unit 45 is activated. No writing pressure is detected.

  On the other hand, FIG. 4B shows a writable state where the core 8 protrudes from the tip end portion 32 a of the base 32. In the state of FIG. 4B, the writing force applied to the core 8 is received, the cushion spring 38 is compressed, and the core feeding portion 36 is retracted in the X2 direction. Thereby, the writing pressure detection part 45 is pressed by the flange 362a, and writing pressure is detected.

  The writing pressure detection unit 45 is, for example, a pressure sensor, and changes its resistance value or capacitance upon receiving a pressing force. The writing pressure detection unit 45 is incorporated in the first resonance circuit 40 as a resistor or a variable capacitor. By receiving the writing pressure, the resonance characteristics of the first resonance circuit 40 change, and the control unit 2b of the coordinate input device 2 can detect the writing pressure. For example, on the coordinate input device 2 side, a dielectric voltage is generated in the antenna coil by a signal (radio wave) transmitted from the electronic pen 3, and the coordinate value of the electronic pen 3 is determined based on the level of the voltage value of the dielectric voltage. Calculated. Further, the control unit 2b can detect the voltage based on the signal level corresponding to the phase difference between the signal (radio wave) transmitted from the electronic pen 3 and the received radio wave.

  The electronic pen 4 shown in FIGS. 5 and 6 is partially different from the electronic pen 3 shown in FIGS. 3 and 4. The electronic pen 4 shown in FIGS. 5 and 6 has a structure called a lead holder (holder type). Here, for convenience, in FIGS. 5 and 6, the same reference numerals are given to the same or similar components as those of the electronic pen 3 in FIGS. 3 and 4. The electronic pen 4 shown in FIGS. 5 and 6 is applied as the electronic pen of the handwriting input device shown in FIGS. 1 and 2.

  As shown in FIG. 5, the outer shape of the electronic pen 4 includes a shaft cylinder 30 composed of a front shaft 30a and a rear shaft 30b, a grip 31 positioned on the outer periphery of the front shaft 30a, and a front of the front shaft 30a (see FIG. 5). 5 and the knock member 33 located on the rear side (X2 side in FIG. 5) of the rear shaft 30b. The electronic pen 4 shown in FIG. 5 is not provided with the base 32 provided with the holding chuck 35 shown in FIG. 3B.

  The mechanical pencil unit 74 of the electronic pen 4 shown in FIG. 5 and FIG. 6 is a mechanism portion that reaches the tip member 72, the lead feeding portion 36, the lead case 37, and the knock portion 33 arranged on the rear end side of the lead case 37. It is said.

  The configuration of the lead feeding portion 36 is as described with reference to FIG. 4A, that is, the lead feeding portion 36 connects the chuck 360, the fastener 361, the joint 362, the joint 362, and the lead case 37. And a chuck spring 363. In the configuration shown in FIG. 6, the fastener 361, the joint 362, and further the flange 362a are integrally formed.

  As shown in FIG. 6, a grip portion 360 a that is divided into a plurality of portions in the circumferential direction is provided on the front side (X1 side) of the chuck 360, and the chuck 360 is connected to the shaft inside the joint 362. It is slidably mounted in the direction O (X1-X2 direction). As shown in FIG. 6, in the front shaft 30a, between the rear end portion of the joint 362 and the inner peripheral end portion provided on the inner peripheral surface of the front shaft 30a facing the rear end portion, They are connected by a cushion spring 38. In the front shaft 30 a, the rear end portion of the joint 362 and the front end portion of the core case 37 are connected by a coiled chuck spring 363.

  FIG. 7 is a cross-sectional view illustrating a state where the electronic pen of FIG. As shown in FIG. 7, when the knock portion 33 is knocked forward (X1), the lead case 37 moves forward, the chuck spring 363 is compressed, and the chuck 360 is protruded forward from the tip member 72. At this time, the divided gripping portion 360 a of the chuck 360 is opened, and the core 8 accommodated in the core case 37 falls by its own weight and passes through the chuck 360. At this time, when the knock portion 33 is returned to the original position, the lead case 37 returns to the rear (X2), and the grip portion 360a of the chuck 360 is tightened by the fastener 361. Thereby, as shown in FIG. 8, the core 8 is gripped by the gripping portion 360 a of the chuck 360.

  In addition, the electronic pen 4 in the present embodiment, like the electronic pen 3 shown in FIG. 4, has a ferrite core 43 formed in a substantially cylindrical shape on the outer peripheral side of the front shaft 30a, as shown in FIG. A first resonance circuit 40 having a coil 41 wound around the outer periphery of the ferrite core 43 and a capacitor 42 disposed on the rear shaft 30b side is provided.

  As shown in FIG. 6, the electronic pen 4 includes a writing pressure detection unit 45 inside. The writing pressure detection unit 45 is disposed, for example, on the tip surface of the tip shaft 30a. Further, as shown in FIG. 6, a flange 362 a provided integrally with a joint 362 constituting the core feeding portion 36 is opposed to the front side (X1 side) of the writing pressure detection unit 45. For the stroke width S provided between the writing pressure detection unit 45 and the flange 362a, refer to the description in FIG.

  In FIG. 6, the lead is not housed in the lead case 37, or even if the lead is housed in the lead case 37, the lead does not protrude from the tip of the gripping portion 360a. Even if writing is performed on the paper 7 shown in FIG. 1 using the electronic pen 4 in this non-writing state, the handwriting 9 by the core does not remain on the paper 7 and the writing pressure detection unit 45 does not operate. Pen pressure is never detected.

  That is, as shown in FIG. 6, in the non-writing state, the gripping portion 360 a is in a state of being almost inside the mouthpiece member 72. The lip member 72 is a portion that does not move even when a pressure is applied. Therefore, in the non-writing state, the gripping portion 360a is not subjected to the applied pressure, and therefore the lead feeding portion 36 does not move backward, and the writing pressure detection portion 45 is not pressed by the flange 362a. . Further, in the non-writing state, the gripping portion 360a slightly protrudes from the tip member 72, and even if movement of the lead feeding portion 36 is allowed to the rear by the amount of the protrusion, the moving distance is the writing pressure. The detection unit 45 has a length that is not pressed by the flange 362a.

  On the other hand, as shown in FIG. 9, in the writable state where the lead 8 protrudes from the tip of the gripping portion 360a, the cushion spring 38 is compressed by receiving the writing pressure applied to the lead 8, and the lead feeding portion 36 is in the X2 direction. Retreat to. Thereby, the writing pressure detection part 45 is pressed by the flange 362a, and writing pressure is detected.

(Electronic eraser)
Next, the electronic eraser 5 will be described mainly with reference to FIGS. As shown in FIG. 10A, the outer shape of the electronic eraser 5 is inserted from the cylindrical main body 50 and the front (X1 side) of the main body 50, and a part protrudes from the front (X1 side) of the main body 50. An eraser 51 such as an eraser to be held, and a tail plug 52 as a lid material on the rear side (X2 side) of the main body 50 are configured. Therefore, as shown in FIG. 1, the handwriting 9 written on the paper 7 can be erased using the electronic eraser 5.

  As shown in FIG. 10B, inside the main body 50, the eraser 51 is located on the rear end side (X2 side) of the eraser 51 and is held on the distal end side of the tail plug 52. Erasing pressure detector 54, a cushion spring 55 connected between the eraser cradle 53 and the tail plug 52, a coil 57, a capacitor 58, and a ferrite core 59. And a circuit 56. The eraser cradle 53 is provided with a cylindrical portion 53a that protrudes forward (X1 direction), and the eraser 51 is press-fitted and held in the cylindrical portion 53a.

  The coil 57 is wound around the outer periphery of a substantially cylindrical ferrite core 59. The coil 57 and the ferrite core 59 are disposed between the main body 50 and the tail plug 52 and between the main body 50 and the eraser cradle 53. It is arranged in the gap between them. Moreover, the capacitor | condenser 58 is hold | maintained in the interior space of the tail plug 52, for example.

  In the configuration shown in FIG. 10B, the eraser 51 is supported so as to be movable in the axial direction O (X 1 -X 2) together with the eraser cradle 53. Therefore, when the pressing force is received in the X2 direction, the eraser receiving base 53 moves backward in the X2 direction together with the eraser 51, and the erasing pressure detecting unit 54 can be pressed to detect the erasing pressure.

  Further, the electronic eraser 5 shown in FIG. 11 is different from FIG. 10 only in the shape of the rear end side of the eraser 51 and the shape of the holding member of the eraser 51, and other components are the same as those in FIG. is there.

  As shown in FIG. 11B, the eraser 51 is provided with a recess 51a on the rear end side, and a cylindrical portion 59a protruding forward (X1 direction) of the eraser pedestal 59 is press-fitted into the recess 51a. ing. Thereby, the eraser 51 is held on the eraser base 59.

  The electronic eraser 5 shown in FIGS. 10 and 11 has a structure in which a substantially cylindrical ferrite core 59 and a coil 57 are arranged on the outer peripheral side of the eraser 51. On the other hand, the electronic eraser 5 shown in FIG. 12 differs from the structure shown in FIGS. 10 and 11 in that the eraser 51 is provided on the outer peripheral side of the coil 57 wound around the outer periphery of the rod-shaped ferrite core 59. It has an arranged structure. In addition, in the electronic eraser 5 of FIG. 12, the part of the same code | symbol as FIG. 10, FIG. 11 has shown the same member as FIG.10 and FIG.11.

  As shown in FIG. 12B, a recess 60a is formed in the eraser base 60 from the rear end side toward the front, and a ferrite core 59 and a coil 57 are provided in the recess 60a. The rear end side of the ferrite core 59 is closed with a pedestal tail plug 60c. Further, a protruding projection 60 b is provided in front of the eraser base 60, and the projection 60 b is press-fitted into a recess formed on the rear end side of the eraser 51. Thereby, the eraser 51 is held on the eraser base 60.

  Further, as shown in FIGS. 10, 11 and 12, the electronic eraser 5 is provided with an erasing pressure detection unit 54. The erasing pressure detection unit 54 is, for example, a pressure sensor, and a pressing force. In response, the resistance value and capacitance change. The erasing pressure detector 54 is incorporated in the second resonance circuit 56 as a resistor or a variable capacitor. By receiving the erasing pressure, the resonance characteristic of the second resonance circuit 56 changes, and the erasing pressure can be detected by the control unit 2b of the coordinate input device 2. For example, on the coordinate input device 2 side, a dielectric voltage is generated in the antenna coil by a signal (radio wave) transmitted from the electronic eraser 5, and the coordinate value of the electronic eraser 5 is based on the voltage value level of the dielectric voltage. Is calculated. Further, the controller 2b can detect the erasing pressure based on the signal level corresponding to the phase difference between the signal (radio wave) transmitted from the electronic eraser 5 and the received radio wave.

  Conventionally, the contents written with the electronic pen had to be displayed and confirmed on an external display, personal computer, or the like. However, according to the present embodiment, the paper 7 is used instead of the display as an external display. Handwriting data can be easily acquired without connecting to a display.

  In the present embodiment, the coordinate input device 2 detects the writing pressure applied to the core 8 in order to suppress unauthorized input such as acquisition of handwriting data even though the writing is not performed on the paper 7, and the writing pressure is reduced. When detected, the coordinate input device 2 acquires handwriting data (coordinate data) of the electronic pen 3. On the other hand, when writing pressure is not detected, handwriting data is not acquired.

  In the present embodiment, the mechanical pencil unit 34 as a whole is not in the form of being pressed by receiving a writing pressure. The whole mechanical pencil unit 34 is a pen tip (the tip 32a of the base 32 in FIGS. 3 and 4 and the grip 360a of the chuck 360 and the tip in FIGS. 5 and 6). This is a unit that includes everything from the member 72) to the knock portion 33. In the case where the entire mechanical pencil unit 34 is configured to be pressed by pressure, the pressure is detected even when the lead 8 is not protruding from the tip because the pressure is detected when the pen tip is pressed. End up. Exactly, the inventions described in Patent Document 1 and Patent Document 2 are configured such that the entire writing unit is pressed by receiving the writing pressure, and the writing pressure is detected even when the core 8 does not protrude from the tip.

  On the other hand, in the present embodiment, not the entire mechanical pencil unit 34 but only a part of the mechanical pencil unit 34 is moved when the writing pressure applied to the core 8 is received. That is, the tip 32a (see FIGS. 3 and 4) of the base 32 constituting the mechanical pencil unit 34 and the tip member 72 (see FIGS. 5 and 6) do not move even if pressed, and move. Is a lead feeding portion 36 located inside the electronic pens 3 and 4. Therefore, in FIGS. 4A and 6 in which the core does not protrude from the tip of the base 32 or the tip member 72, even if the tip portion 32a or the tip member 72 is pressed, the lead feeding portion 36 does not move back, or the amount of retraction is The writing pressure detection unit 45 is small and is not pressed against the flange 362a. Therefore, the writing pressure detection unit 45 does not operate and does not detect writing pressure.

  On the other hand, as shown in FIG. 4B, when the lead 8 protrudes from the tip 32a, the lead feeding portion 36 that grips the lead 8 receives the writing pressure applied to the lead 8, and the writing pressure detection unit 45 is connected to the flange. The writing pressure detection unit 45 is operated by being pressed by 362a. FIG. 4B shows a state in which the lead feeding portion 36 is retracted and the writing pressure detection portion 45 is pressed. In the embodiment shown in FIG. 6 as well, in a state where the lead protrudes from the tip of the gripping portion 360a, the lead feeding portion 36 is retracted due to the writing pressure applied to the lead 8, and the writing pressure detecting portion 45 is connected to the flange. The writing pressure detection unit 45 is operated by being pressed by 362a (see FIG. 9).

  4A, in the configuration having a predetermined stroke width S between the flange 362a and the writing pressure detection unit 45, for example, after the flange 362a contacts the writing pressure detection unit 45, the writing pressure detection unit 45 can be activated, but it may be activated during the stroke. Alternatively, the flange 362a and the writing pressure detection unit 45 may be kept in contact with each other, and the writing pressure detection unit 45 may be pressed after the writing pressure detection unit 45 is activated. In FIG. 4, the writing pressure detector 45 is disposed on the front end surface 30a1 of the front shaft 30a, but may be disposed on the rear end surface of the flange 362a facing the front end surface 30a1 of the front shaft 30a. The arrangement of the stroke width S and the writing pressure detection unit 45 can also be applied to the embodiments shown in FIGS.

  As described above, in the present embodiment, when the writing pressure applied to the core 8 is detected, the coordinate input device 2 acquires the handwriting data of the electronic pens 3 and 4. At the same time as writing to 7, handwriting data corresponding to the handwriting can be acquired. For this reason, in this Embodiment, paper data and the handwriting data acquired with the coordinate input device 2 can be obtained simultaneously and with sufficient consistency.

  In this embodiment, the configuration may be such that only the presence / absence of the writing pressure is detected. However, if the writing pressure level can be detected, the writing pressure level information is also included in the handwriting data. Thus, when the writing pressure is high, processing such as thickening a line displayed on the display device 6 is possible, and handwriting data closer to handwriting can be recorded.

  In the present embodiment, it is preferable that the writing pressure is detected at the front portion of the mechanical pencil unit 34. Thereby, the responsiveness of writing pressure detection can be made favorable.

  In the embodiment shown in FIGS. 3 and 4, the lead feeding portion 36 located behind the tip portion 32 a is provided so as to be able to advance and retreat inside the electronic pen 3 independently of the tip portion 32 a. When the lead feeding portion 36 receives the writing pressure in a state where the lead 8 protrudes from the tip of the mechanical pencil unit 34, the lead feeding portion 36 moves backward in the axial direction O together with the lead 8. In response to the movement of the lead feeding part 36 by the writing pressure, the writing pressure detection part 45 is activated. As a result, the lead feeding portion 36 does not move inside the electronic pen 3 even if it receives a writing pressure in a state where the lead 8 does not protrude from the tip end portion 32 a of the base 32. Therefore, it is possible to prevent the handwriting data from being acquired by the coordinate input device 2 without detecting the writing pressure when the lead 8 is not protruding. On the other hand, in a state where the lead 8 protrudes from the distal end portion 32 a of the mechanical pencil unit 34, the lead feeding portion 36 can move inside the electronic pen 3 by receiving the writing pressure. Thereby, when the writing pressure detection unit 45 is activated and writing on the paper 7, handwriting data can be appropriately acquired.

  In the embodiment shown in FIGS. 5 and 6, the lead feeding portion 36 that can be advanced and retracted is arranged inside the tip member 72, and when the lead is in a writing state protruding from the gripping portion 360 a, the lead feeding portion 36. Moves and the pen pressure detector 45 operates. On the other hand, in the non-writing state, the core feeding portion 36 does not move inside the electronic pen 4 even if it receives the core writing pressure. Or even if it moves, the amount of movement is very small. Thereby, in the writing state, when the writing pressure detection unit 45 operates and writing on the paper 7, handwriting data can be appropriately acquired. On the other hand, in the non-writing state, it is possible to prevent handwriting data from being acquired by the coordinate input device 2 without detecting the writing pressure.

  In addition, a cylindrical shaft cylinder 30 is fixedly disposed inside the electronic pen 3, and as shown in FIG. 4, a lead feeding portion 36 is provided on the tip end side of the tip shaft 30 a constituting the shaft cylinder 30. A part of is inserted. Further, the lead feeding portion 36 is provided with a flange 362a facing the tip surface 30a1 in front of the tip surface 30a1 of the tip shaft 30a, and the writing pressure detection unit 45 is provided on one of the flange 362a and the tip surface 30a1. Is provided. Then, the writing pressure detection unit 45 is pressed against the tip surface 30a1 or the flange 362a, and writing pressure is detected. Thus, the pen pressure can be detected accurately and with a simple configuration using the shaft cylinder 30 fixed inside the electronic pen 3 with the lead feeding portion 36. The same applies to the electronic pen 4 of the embodiment shown in FIG.

  Further, it is preferable that a cushioning material is disposed in a part of the periphery of the core feeding portion 36. For example, a cushioning material can be interposed in the gap between the core feeding portion 36 and the tip shaft 30a or in the space A between the flange 362a and the base 32 shown in FIG. 4B. An example of the buffer material is grease. Alternatively, a mechanical damper mechanism may be provided. Also in the embodiment shown in FIG. 6, the cushioning material can be interposed in the gap or the like between the flange 362 a and the tip member 72.

  By arranging the cushioning material, it is possible to suppress the generation of abnormal noise due to the advance / retreat movement of the lead feeding portion 36. In addition, the lead feeding portion 36 can have a slight resistance so that it does not move forward and backward rapidly with or without writing pressure. Thereby, the writing comfort with the electronic pens 3 and 4 can be made favorable.

  Moreover, it is preferable that the movement amount (stroke width S shown to FIG. 4A and FIG. 6) of the core supply part 36 by writing pressure is 0 mm or more and 0.5 mm or less. Thus, by shortening the movement amount, the writing comfort with the electronic pens 3 and 4 can be improved. It can also be detected with low writing pressure.

  Moreover, in this Embodiment, the pen pressure detection part 45 can be comprised with a pressure sensor. As described above, by using the pressure-sensitive sensor, a thin sensor can be configured and can be appropriately arranged inside the electronic pens 3 and 4. Moreover, by using a pressure sensor, pressurization sensing property can be improved and pen pressure can be detected with high accuracy.

  Further, as shown in FIG. 1, the coordinate input device 2 can detect the presence or absence of the paper 7 in a fixing portion (for example, a scissors) 10 for fixing the paper 7 on the coordinate detection surface 2a. A sensor (not shown) is attached. For this reason, when the fixing unit 10 detects that the sheet 7 is not set on the coordinate detection surface 2 a, the coordinate input device 2 can be controlled not to acquire handwriting data of the electronic pens 3 and 4. As described above, even if writing is performed in a state where the paper 7 is not set on the coordinate detection surface 2a, the acquisition of the handwriting data of the electronic pens 3 and 4 is stopped. It can be suppressed appropriately.

  As shown in FIG. 1, the coordinate input device 2 is provided with a misalignment detection unit 11 that detects whether or not the paper 7 is arranged at a predetermined position on the coordinate detection surface 2a. When the misalignment detection unit 11 determines that the sheet 7 is not arranged at a predetermined position, acquisition of handwriting data of the electronic pens 3 and 4 is stopped. Although the installation position and the number of the misalignment detection units 11 are not limited, it is preferable that a plurality of misalignment detection units 11 be arranged at the corners of the coordinate detection surface 2a. For example, as shown in FIG. 1, the misalignment detector 11 is arranged at the four corners of the coordinate detection surface 2a. As a result, the position of the sheet 7 is shifted with respect to the coordinate detection surface 2 a, and when at least one of the plurality of position shift detection units 11 does not overlap the sheet 7, the position shift occurs. The detection unit 11 can determine that a positional shift has occurred. As described above, even if handwriting is performed in a state where the paper 7 is misaligned, the acquisition of handwriting data of the electronic pens 3 and 4 is stopped. Can be suppressed.

  Note that an infrared sensor, an illuminance sensor, a touch sensor, and the like can be selected as the sensor disposed in the fixed unit 10 and the positional deviation detection unit 11. In addition, when there is no paper 7 or when the paper 7 is misaligned, the user may be notified by sound or light.

  In the present embodiment, the handwriting input device 1 may further include an electronic eraser 5 in addition to the coordinate input device 2 and the electronic pens 3 and 4.

  At this time, a resonance frequency by electromagnetic induction acting between the electronic pens 3 and 4 having the first resonance circuit 40 and the coordinate input device 2, an electronic eraser 5 having the second resonance circuit 56, coordinates The resonance frequency due to electromagnetic induction acting with the input device 2 can be made different. Therefore, each coordinate data of the electronic pens 3 and 4 and the electronic eraser 5 on the coordinate detection surface 2a can be appropriately identified.

  The electronic eraser 5 in the present embodiment includes an eraser 51 that can erase the handwriting 9 written on the paper 7. Therefore, as shown in FIG. 1, the electronic eraser 5 erases the handwriting 9 on the paper 7 and at the same time, based on the coordinate data (erasure data) of the electronic eraser 5 acquired by the coordinate input device 2. The handwriting data recorded in the recording unit 2c can be erased in accordance with the erased handwriting 9.

  Thereby, the erasure of the handwriting 9 written on the paper 7 and the erasure control of the handwriting data corresponding thereto can be performed simultaneously. Here, regarding “handwriting data erasure control”, when the controller 2b obtains handwriting data by the electronic pens 3 and 4 and erasure data by the electronic eraser 5, data that overlaps the erasure data is recorded. In addition to erasing and re-recording the handwriting data recorded in the unit 2c, for example, the handwriting data and the erasing data are recorded in a hierarchy, and the handwriting data and the erasing data are respectively recorded from the transmission unit 2d. The state where transmission is possible is also included. That is, when the handwriting data is displayed on the display device 6 without being erased as data, the state where the data is placed so as to correspond to the erased writing 9 is also included in the state where the handwriting data is controlled to be erased.

  In the present embodiment, an erasing pressure detector 54 capable of detecting the erasing pressure is provided inside the electronic eraser 5. In the configuration shown in FIGS. 10, 11 and 12, when the eraser 51 is pressed, the eraser 51 moves backward and the erasing pressure detector 54 operates to detect the erasing pressure. In the present embodiment, the handwriting data recorded in the recording unit 2c can be controlled to be erased by detecting the erasing pressure. The handwriting 9 written on the paper cannot be properly erased without a certain level of erasing pressure. For this reason, when the erasing pressure is detected, control is performed so that the handwriting data can be erased, so that the erasure of the handwriting 9 written on the paper 7 and the erasure of the handwriting data corresponding thereto are more consistent. be able to.

  In the present embodiment, the erasing pressure detection unit 54 may be controlled to detect only the presence or absence of the erasing pressure. However, if the erasing pressure level can be detected, the erasing pressure level information is also taken in, so that when the erasing pressure is high, data processing that increases the erasing width for the handwriting is possible.

  Further, in the present embodiment, the erasing pressure detection unit 54 can be configured by a pressure sensitive sensor. By using the pressure-sensitive sensor, a thin sensor can be configured and can be appropriately disposed inside the electronic eraser 5. Moreover, by using a pressure sensor, pressurization sensing property can be improved and an erasing pressure can be detected with high accuracy.

  Further, in the positional relationship between the eraser 51, the coil 57, and the ferrite core 59 in the electronic eraser 5, as shown in FIGS. 10 and 11, the coil 57 is disposed on the outer periphery of the rear end side of the eraser 51. Even if the ferrite core 59 is disposed, the eraser 51 may be disposed from the outer periphery on the front end side of the coil 57 and the ferrite core 59 to the front of the coil 57 and the ferrite core 59 as shown in FIG. . Thereby, the coil 57, the ferrite core 59, and the eraser 51 can be arrange | positioned inside the electronic eraser 5 compactly by simple structure. Moreover, in this Embodiment, the coil 57 and the eraser 51 can be arrange | positioned closely, and the position shift between the coil 57 and the eraser 51 can be suppressed to the minimum. Therefore, it is possible to reduce the deviation between the erase position data acquired on the coordinate input device 2 side and the erase position by the eraser 51 on the paper 7. For this reason, it is possible to further improve the consistency between the erasure of the handwriting 9 written on the paper 7 and the erasure of the handwriting data corresponding thereto.

  Moreover, in this Embodiment, it is preferable that the diameter of the eraser 51 is 5 mm or less. When the eraser 51 is other than a circle, the diameter of the eraser 51 indicates the maximum diameter. By setting the diameter of the eraser 51 to 5 mm or less, the positional deviation between the coil 57 and the eraser 51 can be further reduced. Therefore, it is possible to further improve the consistency between the erasure of the handwriting 9 written on the paper 7 and the erasure of the handwriting data corresponding thereto.

  The eraser 51 shown in FIGS. 10, 11, and 12 is configured to be held by press fitting with respect to the eraser base 53 and the eraser bases 59 and 60, and the eraser 51 is appropriately replaced. Can do. Thus, since only the part of the eraser 51 in the electronic eraser 5 can be exchanged and used, it is economical. Further, since the resonance characteristics due to electromagnetic induction with the coordinate input device 2 may change due to the deformation of the eraser 51 due to use, the paper data can be erased and the handwriting data can be replaced by replacing the eraser 51 as appropriate. It is possible to improve the consistency with the erasure of.

  In the present embodiment, it is preferable that the eraser 51 is made of a material that keeps the distance from the coil 57 substantially constant. For example, a liquid-absorbing porous material such as a basic calcium carbonate porous material can be selected as the material of the eraser 51. Thereby, the handwriting 9 by the core 8 of the mechanical pencil unit 34 can be surely erased, and the eraser 51 can be used as an eraser 51 that does not have erase scraps (no change in weight). As described above, the shape of the eraser 51 can be kept substantially constant even by the erasing operation by the eraser 51, and therefore the distance from the coil 57 can be kept almost constant. For this reason, the resonance characteristic by electromagnetic induction with the coordinate input device 2 does not change, and the consistency between the paper data and the handwriting data can be further improved.

  In addition, this invention is not limited to the said embodiment, It can change and implement variously. In the above-described embodiment, the size, shape, and the like illustrated in the accompanying drawings are not limited to this, and can be appropriately changed within a range in which the effect of the present invention is exhibited. In addition, various modifications can be made without departing from the scope of the object of the present invention.

  For example, the electronic pens 3 and 4 and the electronic eraser 5 can be used simultaneously. For example, it is possible to exemplify a usage in which a certain user writes on the paper with the electronic pens 3 and 4 while another user erases the handwriting 9 written on the paper with the electronic eraser 5. For example, the electronic eraser 5 is provided in the tail part of the electronic pens 3 and 4, and the electronic pens 3 and 4 and the electronic eraser 5 may be integrated.

  Further, for example, the coordinate input device 2 is provided with a clock unit in the block diagram shown in FIG. 2, and can be recorded in the recording unit 2c in consideration of time information. For example, detailed data storage can be performed by hierarchically recording handwriting data and erase data of the electronic eraser 5 in time.

DESCRIPTION OF SYMBOLS 1 Handwritten input device 2 Coordinate input device 2a Coordinate detection surface 2b Control part 2c Recording part 2d Transmission part 3, 4 Electronic pen 5 Electronic eraser 6 Display apparatus 7 Paper 8 Core 9 Handwriting 10 Fixing part 11 Position shift detection part 30 Shaft cylinder 30a Lead shaft 30a1 End face 31 Grip 32 Base 32a End part 33 Knock part 34, 74 Mechanical pencil unit 35 Holding chuck 36 Core feeding part 37 Core case 38, 55 Cushion spring 40 First resonance circuit 41, 57 Coils 42, 58 Capacitors 43, 59 Ferrite core 45 Writing pressure detector 50 Main body 51 Eraser 52 Tail plug 53 Eraser cradle 54 Erase pressure detector 56 Second resonance circuit 59, 60 Eraser base 72 Tip member 360 Chuck 360a Grasping part 361 Fastener 362 Joint 362a Flange 363 Chuck spring

Claims (8)

A handwriting input device capable of acquiring handwriting data of the electronic pen on the coordinate detection surface of the coordinate input device by electromagnetic induction action of the coordinate input device and the electronic pen,
The electronic pen includes a resonance circuit including a coil, a capacitor, and a core, a mechanical pencil unit capable of writing on a sheet placed on the coordinate detection surface, and a brush applied to a core protruding from the tip of the mechanical pencil unit. A pressure detection unit capable of detecting the writing pressure by receiving a pressure and pressing a part of the mechanical pencil unit;
The handwriting data corresponding to the handwriting on the paper is acquired by the coordinate input device while writing on the paper with the electronic pen by detecting the writing pressure. Handwriting input device.   Inside the electronic pen, a lead feeding portion that allows the lead to be drawn out from the tip of the mechanical pencil unit is provided so as to be able to advance and retreat, and the lead feeding portion extends from the tip of the mechanical pencil unit. When the writing pressure is received in a state where the lead protrudes, the writing pressure can be retracted in the axial direction together with the lead, and the writing pressure detection unit is activated by the movement of the lead feeding portion by the writing pressure. The handwriting input device according to claim 1, wherein:   A cylindrical shaft cylinder is fixedly disposed inside the electronic pen, and the core feeding portion is inserted on the tip side of the shaft cylinder. A flange facing the front end surface is provided in front of the front end surface, and the writing pressure detection unit is provided on one of the flange and the front end surface, and the writing pressure detection unit is connected to the front end surface. The handwriting input device according to claim 2, wherein the writing pressure is detected by being pressed by a surface or the flange.   The handwriting input device according to claim 2 or 3, wherein a cushioning material is disposed in a part of the periphery of the core feeding portion.   The handwriting input device according to any one of claims 2 to 4, wherein an amount of movement of the lead feeding portion by a writing pressure is 0 mm or more and 0.5 mm or less.   The handwriting input device according to any one of claims 1 to 5, wherein the writing pressure detection unit includes a pressure sensitive sensor.   The coordinate input device is provided with a fixing portion for fixing the paper on the coordinate detection surface, and the presence or absence of the paper can be detected by the fixing portion, and it is determined that there is no paper. The handwriting input device according to any one of claims 1 to 6, wherein acquisition of the handwriting data is stopped. The coordinate input device is provided with a misalignment detection unit that detects whether or not the sheet is arranged at a predetermined position on the coordinate detection surface, and the misalignment detection unit detects that the sheet is at a predetermined position. The handwriting input device according to any one of claims 1 to 7, wherein when it is determined that the handwriting data is not arranged, acquisition of the handwriting data is stopped.

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