JP2012014411A - Electric writing device - Google Patents

Abstract

Correct stroke data is reliably generated even when a writing material is used in an inverted state in which a cover and a spine are almost close to each other.
SOLUTION: A sheet body 10 having a bent portion 10T, an electronic pen 2, and sense coils LX1 to LXm, LY1 to LYn, RX1 to RXm, RY1 to RYn, and a setting input relating to a writing direction by the electronic pen 2. The electronic pen 2 corresponds to the character string described in the note 30 using the coordinate data calculated based on the magnetic field reception results of the sense coils LX1 to LXm, LY1 to LYn, RX1 to RXm, RY1 to RYn. Generated stroke data, and determines whether or not the calculated writing direction calculated based on the time-series change of the generated stroke data matches the set writing direction, and the calculated writing direction and the setting writing direction are determined. If it is determined that the direction matches, the stroke data corresponding to the calculated writing direction is stored.
[Selection] Figure 9

Description

  The present invention relates to an electronic writing apparatus capable of inputting data corresponding to a user's handwritten writing content.

  Conventionally, for example, Patent Literature 1 discloses a technique capable of inputting data corresponding to user-written handwritten content.

  This prior art tablet is provided with a loop coil group. The loop coil group constitutes a position detection area of the position indicator. When the position indicator as an electronic writing instrument is placed in the position detection area on the tablet, the CPU of the tablet performs a transmission / reception operation in a plurality of loops in the vicinity where the position indicator is placed from the loop coil group. The coordinate value of the indicated position, which is the position information of the position indicator, is obtained from these detected signal level distributions.

JP 2009-69898 A

  By the way, in the electronic writing apparatus using a sheet body that is provided with a foldable folding part and is configured to be spread in a predetermined direction so as to cover the substantially notebook-shaped writing object, the above-described substantially notebook-shaped object is provided. The user may open the cursive body in the predetermined direction further than the normal spread state, and may be used as an inverted state in which the front cover and the back cover are substantially close to each other.

  In this inverted state, the one side region and the other side region in the predetermined direction across the bent portion of the sheet body are located at a relatively close distance so that the back sides are back to back. It will be. Therefore, when the user performs a writing operation on the one side area of the writing object, the position information of the electronic writing instrument is acquired based on the reception result of the coil signal as in the above-described conventional technique, and the user When the stroke data corresponding to the written character string is generated, not only the coil provided in the one side region but also the coil provided in the other side region on the opposite side may receive a signal, Stroke data may be generated corresponding to the reception result of the coil signal in the other region. In this case, the character string data based on the stroke data may be mirror image character data of the character string originally written by the user. As described above, there is a possibility that correct stroke data cannot be generated when the writing body is used with the front cover and the spine cover turned upside down.

  An object of the present invention is to provide an electronic writing apparatus capable of reliably generating correct stroke data even when a writing object is used in an inverted state in which a cover and a back cover are in close proximity. is there.

  In order to achieve the above object, the first invention is configured in a shape that can be spread in a predetermined first direction so as to cover a substantially notebook-shaped writing body, and is positioned at a central portion in the first direction. And a sheet body having a folding portion having a folding center line along a second direction orthogonal to the first direction, and for position detection for performing data input corresponding to the writing content to the writing body. An electronic writing instrument for generating and transmitting a writing signal, a writing direction setting means for performing setting input relating to a writing direction by the electronic writing instrument, and a plurality of coils capable of receiving the writing signal transmitted from the electronic writing instrument, The position acquisition means for acquiring the position information of the electronic writing instrument based on the reception result of the writing signal equal to or greater than a predetermined value in the plurality of coils, and the position information acquired by the position acquisition means, Stroke data generation means for generating stroke data corresponding to the writing on the writing object by the electronic writing instrument, and the writing direction by the electronic writing instrument based on the time series change of the stroke data generated by the stroke data generation means Writing direction calculation means for calculating the writing direction, writing direction determination means for determining whether or not the calculated writing direction calculated by the writing direction calculation means matches the set writing direction set by the writing direction setting means And a data storage means for accumulating stroke data corresponding to the calculated writing direction when it is determined by the writing direction determining means that the calculated writing direction matches the set writing direction. To do.

  In the first invention of this application, the writing signal transmitted from the electronic writing instrument is received by the plurality of coils, and the position acquisition means acquires the position information of the electronic writing instrument based on the reception result. When the user writes a desired character on the writing object using the electronic writing instrument, the position of the electronic writing instrument changes due to the user's writing operation, and the position information of the electronic writing instrument corresponding to the change is acquired. Obtained by means. The stroke data generation means generates stroke data using the acquired position information. Thereby, the stroke data corresponding to the character string described by the user in the script is generated.

  Here, the writing object which is the object of the first invention of the present application has a substantially notebook shape, and the sheet body covering the writing object correspondingly has a bent portion and a shape that can be spread in the first direction. It has become. With respect to such a writing object, the user may use it in a reversed state in which the cover and spine cover are almost close to each other by opening further in the first direction than the normal spread state. In this inverted state, in the sheet body, the region on one side in the first direction and the region on the other side in the first direction across the bent portion are positioned at a relatively close distance so that the back sides are back to back. It becomes. Therefore, when the user performs a writing operation on the one side region, not only the coil provided in the one side region of the sheet body but also the coil provided in the other side region on the opposite side is a predetermined value or more. There is a risk of receiving a writing signal of a level of. In this case, for example, when the character string data is erroneously created by the stroke data corresponding to the reception result of the writing signal of the coil on the other side region, the character string data is the character string originally written by the user. There is a risk of mirror image character data.

  Therefore, in the first invention of the present application, a writing direction setting means is provided, and the user uses the writing direction setting means to perform setting input related to the writing direction using the electronic writing instrument. When the stroke data based on the reception result of the coil writing signal is sequentially generated by the stroke data generating means as described above, the writing direction calculating means calculates the writing direction of the electronic writing instrument based on the time series change of the stroke data. . Then, the writing direction determination means determines whether or not the calculated writing direction calculated as described above matches the set writing direction set and input as described above.

  If it is determined that the calculated writing direction and the set writing direction do not match, incorrect stroke data is generated based on the reception result in the coil on the opposite side to the original side. On the other hand, when it is determined that the calculated writing direction matches the set writing direction, correct stroke data is generated based on the reception result in the original coil. Therefore, the data storage means stores the stroke data at this time.

  As described above, in the first invention of the present application, correct stroke data can be reliably generated even when the writing body is used with the front cover and the spine cover turned upside down substantially in close proximity.

  According to a second invention, in the first invention, the sheet body includes a first sheet portion provided on one side of the bent portion along the first direction, and the bent portion along the first direction. A second sheet part provided on the other side of the first sheet part, wherein the plurality of coils include a first coil provided on the first sheet part and a second coil provided on the second sheet part. The position acquisition means acquires position information of the electronic writing instrument based on the reception result of the writing signal at the first coil and the second coil, and the stroke data generation means includes the first coil. And the first stroke data corresponding to the first coil and the second stroke corresponding to the second coil using the position information acquired by the position acquisition means based on the reception of the writing signal by the second coil. 2 And the writing direction calculation means generates a first calculation writing direction and a second calculation writing direction respectively corresponding to the first stroke data and the second stroke data generated by the stroke data generation means. The writing direction determination means calculates and the first calculated writing direction and the second calculated writing direction calculated by the writing direction calculation means match the set writing direction set by the writing direction setting means. Each of the data storage means accumulates the first stroke data when the writing direction determination means determines that the first calculated writing direction matches the set writing direction; When the writing direction determination means determines that the second calculated writing direction matches the set writing direction, the second stroke data And when the writing direction determination means determines that the first calculated writing direction matches the set writing direction, the second stroke data is erased, and the writing direction determination means A data erasure unit is provided for erasing the first stroke data when it is determined that the second calculated writing direction coincides with the set writing direction.

  The sheet body provided in the second invention of the present application includes a first sheet portion, a bent portion, and a second sheet portion. When the writing object is used in an inverted state, the first sheet portion and the second sheet portion are close to each other. For this reason, for example, a signal that should originally be received by the first coil of the first sheet portion is received by the second coil of the second sheet portion, or a signal that should be received by the second coil is received by the first coil. There is a fear.

  In the second invention of the present application, the calculated writing direction is the set writing direction out of the first stroke data and the second stroke data generated in response to the reception results of the first coil and the second coil, respectively. The data storage means stores the stroke data that coincides with. Of the first stroke data and the second stroke data, the data erasing means erases the stroke data whose calculated writing direction does not match the set writing direction.

  As described above, in the second invention of the present application, after generating both correct stroke data and incorrect stroke data, the incorrect stroke data is deleted. Thereby, correct stroke data can be generated reliably. In addition, it is possible to perform highly reliable processing as compared to the case where erroneous stroke data is corrected and used.

  According to a third invention, in the first invention, the sheet body includes a first sheet portion provided on one side of the bent portion along the first direction, and the bent portion along the first direction. A second sheet part provided on the other side of the first sheet part, wherein the plurality of coils include a first coil provided on the first sheet part and a second coil provided on the second sheet part. The position acquisition means acquires position information of the electronic writing instrument based on the reception result of the writing signal in the first coil, or based on the reception result of the writing signal in the second coil. The position information of the electronic writing instrument is acquired, and the stroke data generation means uses the position information acquired by the position acquisition means based on the reception of the writing signal by the first coil, and the first coil The first corresponding to Generate troke data, or generate second stroke data corresponding to the second coil using the position information acquired by the position acquisition means based on reception of the writing signal at the second coil The writing direction calculation means calculates a first calculated writing direction corresponding to the first stroke data generated by the stroke data generation means, or the second direction generated by the stroke data generation means. A second calculated writing direction corresponding to the stroke data is calculated, and the writing direction determining means is the first calculated writing direction calculated by the writing direction calculating means and the setting writing direction set by the writing direction setting means. Or the second calculated writing direction calculated by the writing direction calculation means It is determined whether or not the set writing direction set by the writing direction setting means matches, and the writing direction determining means determines that the first calculated writing direction does not match the set writing direction. The first stroke data is subjected to mirror image conversion processing for inverting the first calculated writing direction along the first calculated writing direction in relation to the first direction, and the writing direction determining means performs the second When it is determined that the calculated writing direction does not match the set writing direction, the second stroke data is mirror-image-transformed so as to be reversed along the second calculated writing direction related to the first direction among the second calculated writing directions. When the conversion means is provided for performing processing, and the data storage means determines that the first calculated writing direction matches the set writing direction by the writing direction determination means The first stroke data is accumulated, and when the writing direction determination means determines that the second calculated writing direction matches the set writing direction, the second stroke data is stored, and the writing direction determination means When it is determined that the first calculated writing direction does not match the set writing direction, the first stroke data after the mirror image conversion process by the converting unit is accumulated, and the second calculation is performed by the writing direction determining unit. When it is determined that the writing direction does not coincide with the set writing direction, the second stroke data after mirror image conversion processing by the converting means is stored.

  As described above, the first stroke data not corresponding to the setting writing direction generated corresponding to the reception result in the first coil, or the setting writing direction generated corresponding to the reception result in the second coil The second stroke data that does not match is mirror image character data of a character string originally written by the user. The third invention of the present application corresponds to the above, and the conversion means performs a mirror image conversion process on the stroke data whose calculated writing direction does not coincide with the set writing direction. Thus, correct stroke data can be reliably generated in the form of correct correction without deleting erroneous stroke data.

  According to a fourth aspect of the present invention, in the first or second aspect of the invention, the writing direction determining means includes the calculated writing direction related to the first direction among the calculated writing directions calculated by the writing direction calculating means, It is characterized by determining whether a setting writing direction corresponds.

  As described above, the generation of an erroneous character string can be caused by the fact that the front cover and the back cover are close to each other through the folding line. In this case, the difference between the distance between the electronic writing instrument and the first coil and the distance between the electronic writing instrument and the second coil is small, and the coil corresponding to the area of the writing object being written by the user is the first coil. And I do not know which is the second coil.

  Here, in the case where the first sheet portion, the bent portion, and the second sheet portion are arranged in the order of the first sheet portion, the bent portion, and the second sheet portion, the first sheet portion and the second sheet portion are bent at the bent portion. With respect to the line, the positional relationship is axisymmetric. Therefore, among the writing directions calculated by the writing direction calculation means based on the writing operation of the user, the writing direction related to the direction of the folding line, that is, the direction orthogonal to the first direction is calculated based on the reception result of the first coil. The same direction is obtained even when calculated based on the reception result of the second coil. On the other hand, among the calculated writing directions calculated by the writing direction calculating means, the direction perpendicular to the folding line, that is, the calculated writing direction related to the first direction is calculated based on the reception result of the first coil. When calculated based on the reception result of two coils, the directions are opposite to each other.

  Therefore, in the fourth invention of the present application, the writing direction determination means determines whether or not the calculated writing direction in the first direction matches the set writing direction. As a result, it is possible to reliably identify which coil is related to generation of a correct character string.

  According to a fifth invention, in the fourth invention, the page assigning means for assigning a page number to the stroke data generated by the stroke data generating means, and the first direction calculated by the writing direction calculating means. A writing change determining means for determining whether or not the writing direction related to the direction has changed, and the page number to be given when the writing change determining means determines that the writing direction related to the first direction has changed. And a page switching means for controlling the page giving means so as to switch the page.

  When a user writes a character string on a script, for example, the character string is described on one side of a substantially notebook spread, the page is filled with the character string, and there is no description portion. In such a case, it is normal to newly write a character string on the other page. Therefore, it is convenient for the user that the stroke data sequentially generated by the stroke data generation means and stored in the data storage means can be arranged for each page, as in the case of the above-described writing body.

  In the fifth invention of the present application, page assigning means is provided corresponding to the above, and this page assigning means assigns a page number to the stroke data. Here, when an actual writing moves from one page to the next page while being used as the flipped state, the writing direction related to the first direction of the stroke data is switched to the reverse direction after the page. . Therefore, in the fifth invention of this application, the writing change determination means determines whether or not the writing direction related to the first direction calculated by the writing direction calculation means has changed in response to such a behavior. When it is determined that the writing direction related to the first direction has changed, it is considered that the page transition in the actual writing as described above has been performed, and the page switching unit controls the page providing unit. As a result, the page number assigned to the stroke data is switched.

  As described above, in the fifth invention of the present application, the page number given to the stroke data can be automatically switched using the change behavior of the stroke data accompanying the writing operation.

  In a sixth aspect based on the fifth aspect, when the page switching unit is controlled by the page switching unit, the writing direction calculating unit is configured to determine the stroke data before the writing direction is changed. The writing direction is calculated, and the writing direction determination means is calculated by the writing direction calculation means, the calculated writing direction of the stroke data until the writing direction is changed, and the writing direction setting means. It is determined whether or not the set writing direction that is set matches, and the data storage means, when the writing direction determination means determines that the calculated writing direction and the set writing direction match, Stroke data corresponding to the calculated writing direction is accumulated until the writing direction is changed.

  Thus, every time the page number assigned to the stroke data is switched, that is, every time a so-called page break operation is performed, correct stroke data can be generated and stored. In addition, by this, unlike the case where stroke data for all pages is processed at once, when the writing direction is different between one page and the next page, that is, pages with different writing directions are mixed in the cursive body. Even in this case, the stroke data can be processed in the correct direction for each page.

  According to a seventh invention, in any one of the first to sixth inventions, the character recognition means for recognizing the stroke data generated by the stroke data generation means for each character data included in the stroke data. And the writing direction calculation means calculates the writing direction by the electronic writing instrument based on the additional behavior of the character data recognized by the character recognition means.

  In the seventh invention of this application, the writing direction can be reliably calculated by cutting out the character data included in the stroke data and recognizing in which direction new character data is added.

  According to the present invention, it is possible to reliably generate correct stroke data even when the writing body is used in a state in which the front cover and the back cover are almost turned upside down.

It is an external appearance perspective view, a conceptual top view, and a conceptual side view showing the mode at the time of use of the handwriting input device of one embodiment of the present invention. It is a functional block diagram showing the functional structure of a handwriting input device. It is a notional top view showing internal composition of a left coil sheet and a right coil sheet. It is a conceptual top view showing the vertical installation state and horizontal installation state of a coordinate detection apparatus. It is explanatory drawing explaining the writing direction of the right vertical writing in vertical setting, and the writing direction of the left vertical writing in vertical setting. It is explanatory drawing explaining the writing direction of the left horizontal writing in vertical setting, and the writing direction of the right horizontal writing in vertical setting. It is explanatory drawing explaining the writing direction of the right vertical writing in landscape orientation, and the writing direction of the left vertical writing in landscape orientation. It is explanatory drawing explaining the writing direction of the left horizontal writing in landscape orientation, and the writing direction of the right horizontal writing in landscape orientation. It is explanatory drawing showing a use aspect when used in an inverted state. It is explanatory drawing showing the stroke data produced | generated when used in an inverted state. It is a flowchart showing the content of the control processing performed with CPU of a coordinate detection apparatus. It is a flowchart showing the content of the control processing performed with CPU of a coordinate detection apparatus. It is a flowchart showing the content of the control processing performed with CPU of a coordinate detection apparatus. It is explanatory drawing and a graph explaining the principle which detects the coordinate of an electronic pen using a coil sheet. It is the graph and table for demonstrating the principle which detects the coordinate of an electronic pen. It is explanatory drawing explaining the principle which calculates the writing direction with the electronic pen. It is a flowchart showing the content of the control processing performed in CPU of a coordinate detection apparatus in the modification which reverses and accumulates incorrect stroke data. It is a flowchart showing the content of the control processing performed with CPU of a coordinate detection apparatus. It is a flowchart showing the content of the control processing performed with CPU of a coordinate detection apparatus. It is a flowchart showing the content of the control processing performed by CPU of a coordinate detection apparatus in the modification which performs a page switching automatically. It is a flowchart showing the content of the control processing performed with CPU of a coordinate detection apparatus. It is a flowchart showing the content of the control processing performed with CPU of a coordinate detection apparatus. It is a flowchart showing the content of the control processing performed with CPU of a coordinate detection apparatus.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  A handwriting input device 1 that is an electronic writing device according to the present embodiment includes an electronic pen 2 that is an electronic writing tool and a coordinate detection device 3 as shown in FIG. In the handwriting input device 1, the user has an electronic pen 2. In addition to the function as a writing instrument, the electronic pen 2 functions as input means for input positional information, that is, coordinate data.

  As shown in FIGS. 1 (a), 1 (b), and 1 (c), the coordinate detection device 3 has a predetermined first direction (left and right direction in FIG. 1 (b)) so as to substantially cover the notebook 30. ) Has a sheet body 10 configured to be spreadable. In the following description, the first direction (the left-right direction in FIG. 1B) is the first based on the state in which the sheet body 10 is installed in the above-described spread shape (the state in FIG. 1B). A direction 4 is defined, and a second direction (vertical direction in FIG. 1B) perpendicular to the first direction is defined as a second direction 5.

  The sheet body 10 includes a left sheet portion 10 </ b> L that is a first sheet portion, a right sheet portion 10 </ b> R that is a second sheet portion, and a bent portion 10 </ b> T that is positioned at the central portion in the first direction 4. The left sheet portion 10L is provided on one side (left side in FIG. 1B) of the bent portion 10T along the first direction 4 and includes a left coil sheet 100L. The right sheet portion 10R is provided on the other side (the right side in FIG. 1B) of the bent portion 10T along the first direction 4 and includes a right coil sheet 100R. The bent portion 10T is a portion that can be bent by the user, and has a bent center line T along the second direction 5 as shown in FIG.

  A notebook 30 having a shape that can be spread in the first direction 4, which is a substantially notebook-shaped writing body, is disposed so as to overlap the sheet body 10. Note that a notebook holding section 11 as shown in FIG. 1A may be provided on each of the left sheet section 10L and the right sheet section 10R. Thereby, the coordinate detection apparatus 3 can be integrated with the notebook 30 easily and reliably, and the handleability by the user can be improved.

  The user writes a desired handwritten character string or the like on the left writing surface 31 </ b> L or the right writing surface 31 </ b> R of the notebook 30 using the electronic pen 2. By the movement of the electronic pen 2 corresponding to the writing operation, stroke data based on a pen position data string D described later corresponding to the written character string or the like is stored in the electronic file. At that time, the user operates a page switching button (not shown) by switching the page to the left writing surface 31L, the right writing surface 31R, etc. of the notebook 30 by actually operating the page switching button (not shown). It can be saved while switching the page of the file (described later).

  When the user uses the handwriting input device 1, a power switch (not shown) provided in the electronic pen 2 is turned on. In this example, the electronic pen 2 generates and transmits an alternating magnetic field having a predetermined frequency as a writing signal for position detection for inputting data corresponding to the writing content on the writing surface 31. As shown in FIG. 2, the electronic pen 2 includes a tip switch 42, an LC oscillation circuit 41, and a battery 43.

  The tip switch 42 is turned on when the user presses the tip 2 a of the electronic pen 2 against the writing surface 31 to write a character or the like using the electronic pen 2, and sends a command signal to the LC oscillation circuit 41. S0 is output. On the other hand, the tip switch 42 is turned off when the user stops writing of characters or the like and separates the tip 2 a of the electronic pen 2 from the writing surface 31. In this case, the command signal S0 is not output.

  The LC oscillation circuit 41 is a circuit that generates an alternating magnetic field having the predetermined frequency (hereinafter, simply referred to as “magnetic field” as appropriate) when the command signal S0 is input from the front end switch. The LC oscillation circuit 41 includes a capacitor and a coil (not shown).

  The battery 43 supplies power to the LC oscillation circuit 41 when the power switch of the electronic pen 2 is turned on.

  As shown in FIG. 2, the coordinate detection device 3 includes a left coil sheet 100L and a right coil sheet 100R, a microcomputer 80, a multiplexer 62 (hereinafter referred to as “MUX 62” as appropriate), an amplifier circuit 64, and a rectifier circuit. 66, flash memory 72, communication interface 74, display unit 76, and battery 21.

  The left coil sheet 100L provided on the left sheet portion 10L includes a left sense coil portion 110L as shown in FIG. That is, the left-side sense coil portion 110L arranged as shown in FIG. 3A is resin-molded into, for example, a thin plate shape having a rectangular outer shape to constitute the left-side coil sheet 100L.

  As shown in FIG. 3A, the left sense coil unit 110L is capable of receiving a magnetic field generated from the electronic pen 2, and is arranged in m loops arranged in the x-axis direction corresponding to the first direction 4. Left-side sense coils LX1 to LXm and n loop-shaped left-side sense coils LY1 to LYn arranged in the y-axis direction corresponding to the second direction 5 described above. The left sense coils LX1 to LXm and the left sense coils LY1 to LYn are arranged in an orthogonal positional relationship. The left-side sense coils LX1 to LXm and LY1 to LYn are formed of, for example, a copper wire having an insulating coating layer formed on the surface.

  The left-side sense coils LX1 to LXm are each formed in a substantially rectangular shape including a side having a width P1 in the x-axis direction and a side having a length P2 in the y-axis direction longer than P1. Each of the left sense coils LX1 to LXm is continuously arranged in the x-axis direction at a predetermined constant pitch. For example, the adjacent left-side sense coils LX1 to LXm are overlapped at a pitch of 1/2 of P1.

  The left-side sense coils LY1 to LYn are each formed in a substantially rectangular shape including a side having a width P3 in the x-axis direction and a side having a length P1 in the y-axis direction shorter than P3. Each of the left sense coils LY1 to LYn is arranged continuously in the y-axis direction at a predetermined constant pitch. For example, the adjacent left-side sense coils LY1 to LYn are overlapped with each other at a half pitch of P1.

  The right coil sheet 100R provided on the right sheet portion 10R includes a right sense coil portion 110R as shown in FIG. That is, the right sense coil portion 110R arranged as shown in FIG. 3B is resin-molded, for example, into a thin plate having a rectangular outer shape, like the left sense coil portion 110L, so that the right coil sheet 100R is configured. ing.

  As shown in FIG. 3B, the right sense coil unit 110R is capable of receiving a magnetic field generated from the electronic pen 2, and is arranged in m loops arranged in the x-axis direction corresponding to the first direction 4. Right-side sense coils RX1 to RXm and n loop-shaped right-side sense coils RY1 to RYn arranged in the y-axis direction corresponding to the second direction 5 described above. The right sense coils RX1 to RXm and the right sense coils RY1 to RYn are arranged in an orthogonal positional relationship. The right sense coils RX1 to RXm have the same structure as the left sense coils LX1 to LXm. The right sense coils RY1 to RYn have the same structure as the left sense coils LY1 to LYn.

  In FIG. 3A and FIG. 3B, for the sake of clarity, each side of the left sense coils LX1 to LXm and the left sense coils LY1 to LYn and the right sense coils RX1 to RX1 are shown for convenience. The sides of RXm and right-side sense coils RY1 to RYn are not overlapped, and are not shown in the state of being arranged at the above pitch.

  The sense coils LX1 to LXm, LY1 to LYn, RX1 to RXm, and RY1 to RYn correspond to the magnetic field generated by the electronic pen 2, and the signal S1 is sent from the electronic pen 2 to the coordinate detection device 3 (see FIG. 2). ). The sense coils LX1 to LXm, LY1 to LYn, RX1 to RXm, and RY1 to RYn are connected to the MUX62.

  Note that each of the left sense coils LX1 to LXm, LY1 to LYn and each of the right sense coils RX1 to RXm, RY1 to RYn correspond to the coils described in the claims. Among them, each of the left side sense coils LX1 to LXm, LY1 to LYn corresponds to a first coil, and each of the right side sense coils RX1 to RXm, RY1 to RYn corresponds to a second coil.

  Returning to FIG. 2, the microcomputer 80 comprises a CPU 80a, a ROM 80b, a RAM 80c, and other A / D conversion function units, interrupt function units, and the like as one integrated circuit. The microcomputer 80 controls various processes executed by the coordinate detection device 3.

  Based on the coil selection signal S3 from the microcomputer 80, the MUX 62 sequentially selects one sense coil among the left sense coils LX1 to LXm, LY1 to LYn and the right sense coils RX1 to RXm and RY1 to RYn. The MUX 62 receives the signal S1 generated by magnetic induction with the magnetic field generated from the LC oscillation circuit 41 of the electronic pen 2 in the selected sense coils LX1 to LXm, LY1 to LYn, RX1 to RXm, and RY1 to RYn. And the corresponding signal S11 is output to the amplifier circuit 64. Note that magnetic induction with the magnetic field generated from the electronic pen 2 substantially corresponds to reception of the magnetic field.

  The amplifier circuit 64 amplifies the signal S11 input from the MUX 62. The signal S13 amplified by the amplifier circuit 64 is input to the rectifier circuit 66.

  The rectifier circuit 66 amplitude-detects the signal S13 input from the amplifier circuit 64, smoothes it, and converts it into a DC signal. The signal S14 subjected to amplitude detection by the rectifier circuit 66 is input to the microcomputer 80.

  As described above, the microcomputer 80 has an A / D conversion function, and converts the input signal S14 after amplitude detection into a digital signal. At this time, the ROM 80b of the microcomputer 80 stores a position coordinate table described later. The microcomputer 80 calculates the coordinate data of the electronic pen 2, that is, the x coordinate in the x axis direction and the y coordinate in the y axis direction, by applying a position coordinate table to the digital signal. The calculated coordinate data is stored in the flash memory 72. Details of this coordinate data calculation method will be described later.

  An electronic file is prepared in advance in the flash memory 72, and coordinate data calculated by the microcomputer 80 is written and stored in the electronic file.

  The communication interface 74 is an interface for providing stroke data based on a later-described pen position data string D including a plurality of coordinate data stored in the flash memory 72 to an external device such as a personal computer. Specifically, the communication interface 74 is, for example, a USB interface for Universal Serial Bus (USB) connection, a memory card slot such as an SD card, or a wireless or wired network interface.

  The display unit 76 is configured by, for example, a Liquid Crystal Display (LCD), and displays predetermined information (details will be described later).

  The battery 21 supplies power to the microcomputer 80 and the like when a power switch (not shown) provided in the coordinate detection device 3 is turned on.

  The feature of the present embodiment having the above-described configuration is that it is determined whether or not the writing direction by the electronic pen 2 calculated by the microcomputer 80 matches the writing direction by the electronic pen 2 set in advance. In this case, stroke data corresponding to the writing direction by the electronic pen 2 calculated by the microcomputer 80 is accumulated.

  Here, as described above, the writing object that is the target of the present embodiment is the notebook 30 having a substantially notebook shape, and therefore the user uses the notebook 30 in a vertical position or in a horizontal position. be able to. As shown in FIG. 4A, when the user uses the notebook 30 in a vertical position, that is, when the coordinate detection device 3 is used in a vertical position, the first direction 4 is the horizontal direction in the figure, The second direction 5 is the vertical direction in the figure. In the following, the first direction 4 (left-right direction in the figure) when the coordinate detection device 3 is used in the vertical position will be referred to as “vertical first direction 4” and the second direction 5 (up-down direction in the figure). Is referred to as “vertical second direction 5”. On the other hand, as shown in FIG. 4B, when the user uses the notebook 30 in a horizontal position, that is, when the coordinate detection device 3 is used in a horizontal position, the first direction 4 is the vertical direction in the figure. Thus, the second direction 5 is the horizontal direction in the figure. Hereinafter, when the coordinate detection device 3 is used in the horizontal orientation, the first direction 4 (vertical direction in the figure) is referred to as “horizontal first direction 4” and the second direction 5 (horizontal direction in the figure). Is referred to as “horizontal second direction 5”.

  In general, when writing characters on the writing surface 31 of the notebook 30, there are four possible writing modes: right vertical writing, left vertical writing, right horizontal writing, and left horizontal writing. Hereinafter, with the electronic pen 2 in the case where characters are written in the above-described four writing modes on the writing surface 31 of the notebook 30 used vertically and the writing surface 31 of the notebook 30 used horizontally. The writing direction will be explained sequentially. In the present embodiment, the writing direction by the electronic pen 2 is defined as a generic term of a writing direction that is a direction in which a character is written and a line advancing direction that is a direction in which the line proceeds.

  First, the writing direction when the coordinate detection device 3 is used in a vertical position will be described.

  As shown in FIG. 5A, when writing in the right vertical writing direction with respect to the writing surface 31 of the vertically placed notebook 30, the user moves downward from the upper right corner of one writing surface 31. Write to the front. Then, when reaching the lower end of the writing surface 31, the user writes down again from the upper corner of the next line, that is, the line adjacent to the left side. Accordingly, in this case, the writing direction WD is a direction in which writing proceeds from top to bottom along the vertical second direction 5 (vertical direction in the figure), and the row traveling direction LD is the first vertical direction. 4 (the left-right direction in the figure), the direction proceeds from right to left.

  As shown in FIG. 5 (b), when writing in the left vertical writing direction on the writing surface 31 of the vertically placed notebook 30, the user moves downward from the upper left corner of one writing surface 31. Write to the front. When the user reaches near the lower end of the writing surface 31, the user writes down again from the upper corner of the next line, that is, the line adjacent to the right side. Accordingly, in this case, the writing direction WD is a direction in which writing proceeds from top to bottom along the vertical second direction 5 (vertical direction in the figure), and the row traveling direction LD is the first vertical direction. 4 (the left-right direction in the figure), the direction proceeds from left to right.

  As shown in FIG. 6A, when writing in the left horizontal writing direction with respect to the writing surface 31 of the vertically placed notebook 30, the user goes from the upper left corner of one writing surface 31 to the right. To write. Then, when reaching the right end of the writing surface 31, the user performs writing toward the right again from the left end in the next line, that is, the region that is one step below the writing surface 31. Accordingly, in this case, the writing direction WD is a direction in which writing is performed from left to right along the first vertical direction 4 (the left-right direction in the drawing), and the row traveling direction LD is the second vertical direction. 5 (the up-down direction in the figure), the direction proceeds from top to bottom.

  As shown in FIG. 6B, when writing in the right horizontal writing direction on the writing surface 31 of the vertically placed notebook 30, the user moves from the upper right corner of one writing surface 31 to the left. To write. When the user reaches near the left end of the writing surface 31, the user performs writing toward the left again from the right end in the next line, that is, the region lowered by one step in the writing surface 31. Accordingly, in this case, the writing direction WD is a direction in which writing is performed from right to left along the first vertical direction 4 (left-right direction in the drawing), and the row traveling direction LD is the second vertical direction. 5 (the up-down direction in the figure), the direction proceeds from top to bottom.

  Next, the writing direction when the coordinate detection device 3 is used in the horizontal orientation will be described.

  As shown in FIG. 7A, when writing in the right vertical writing direction on the writing surface 31 of the horizontally placed notebook 30, the user moves downward from the upper right corner of one writing surface 31. Write to the front. Then, when reaching the lower end of the writing surface 31, the user writes down again from the upper corner of the next line, that is, the line adjacent to the left side. Therefore, in this case, the writing direction WD is a direction in which writing proceeds from top to bottom along the horizontal first direction 4 (vertical direction in the figure), and the row traveling direction LD is the horizontal second direction. 5 (the left-right direction in the figure), the direction proceeds from right to left.

  As shown in FIG. 7B, when writing in the left vertical writing direction on the writing surface 31 of the horizontally placed notebook 30, the user moves downward from the upper left corner of one writing surface 31. Write to the front. When the user reaches near the lower end of the writing surface 31, the user writes down again from the upper corner of the next line, that is, the line adjacent to the right side. Therefore, in this case, the writing direction WD is a direction in which writing proceeds from top to bottom along the horizontal first direction 4 (vertical direction in the figure), and the row traveling direction LD is the horizontal second direction. 5 (the left-right direction in the figure), the direction proceeds from left to right.

  As shown in FIG. 8A, when writing in the left horizontal writing direction with respect to the writing surface 31 of the horizontally placed notebook 30, the user moves from the upper left corner of one writing surface 31 to the right. To write. Then, when reaching the right end of the writing surface 31, the user performs writing toward the right again from the left end in the next line, that is, the region that is one step below the writing surface 31. Accordingly, in this case, the writing direction WD is a direction in which writing proceeds from left to right along the horizontal second direction 5 (the left-right direction in the figure), and the row traveling direction LD is the first horizontal direction. 4 (the up-down direction in the figure) is a direction that proceeds from top to bottom.

  As shown in FIG. 8B, when writing in the right horizontal writing direction on the writing surface 31 of the horizontally placed notebook 30, the user moves from the upper right corner of one writing surface 31 to the left. To write. When the user reaches near the left end of the writing surface 31, the user performs writing toward the left again from the right end in the next line, that is, the region lowered by one step in the writing surface 31. Accordingly, in this case, the writing direction WD is a direction in which writing is performed from right to left along the horizontal writing second direction 5 (the horizontal direction in the drawing), and the row traveling direction LD is the horizontal writing first direction 4 ( (The vertical direction in the figure), the direction proceeds from top to bottom.

  Here, as described above, since the sheet body 10 included in the coordinate detection device 3 has a shape that can be spread in the first direction 4, the user opens the sheet body 10, that is, the notebook 30 (see FIG. 1). (B) and FIG. 1C). And with respect to such a notebook 30, the user is further in the first direction 4 (FIG. 1B and FIG. 1) than the normal spread state (the state of FIG. 1B and FIG. 1C). c) It opens in the middle left-right direction), and as shown in FIGS. 9A and 9B, there may be a case where the left seat portion 10L and the right seat portion 10R are used in an inverted state.

  When the notebook 30 is used in the inverted state, the left sheet portion 10L and the right sheet portion 10R of the sheet body 10 are close to each other. In this case, the difference between the distance between the electronic pen 2 and the left coil sheet 100L provided on the left sheet portion 10L and the distance between the electronic pen 2 and the right coil sheet 100R provided on the right sheet portion 10R are different. Less. Therefore, when the user writes a character string on one writing surface 31 using the electronic pen 2, the magnetic field generated from the electronic pen 2 is changed to the left sense coil portion 110L on the left coil sheet 100L side and the above In some cases, the signal is received by both the right-side sense coil unit 110R on the right-side coil sheet 100R side.

  As described above, when the magnetic field is received by both the left sense coil unit 110L and the right sense coil unit 110R, which is the sense coil unit 110 corresponding to the writing surface 31 written by the user. I don't know. For this reason, when stroke data is created corresponding to the reception result of the magnetic field in the sense coil unit 110 opposite to the sense coil unit 110 corresponding to the writing surface 31 written by the user, the stroke data is Incorrect stroke data. Specifically, the stroke data is mirror image character data obtained by inverting the character string originally written by the user along the first direction 4.

  In the example shown in FIG. 9A and FIG. 9B, the first writing line in the left horizontal writing direction described above with respect to the left writing surface 31L of the vertically placed notebook 30 used as the inside-out state is shown in the first line. The character strings “A”, “I”, “U”, “E”, “O” are written, and the character strings “KA”, “KI”, “KU”, “KE”, and “KO” are written on the second line. Then, the magnetic field generated from the electronic pen 2 corresponding to the writing operation of the character string is opposite to the left sense coil portion 110L on the left coil sheet 100L side corresponding to the left writing surface 31L on which the character string is written, and the opposite side. The case where it is received by both the right side sense coil part 110R of the right side coil sheet 100R side is shown.

  In such a case, the stroke data generated based on the reception result of the magnetic field at the left sense coil unit 110L corresponding to the left writing surface 31L on which the character string is written is correct as shown in FIG. It becomes stroke data. On the other hand, stroke data generated based on the reception result of the magnetic field in the right sense coil portion 110R opposite to the left sense coil portion 110L corresponding to the left writing surface 31L on which the character string is written is shown in FIG. As shown in b), the stroke data is incorrect. Specifically, it is mirror image character data obtained by inverting the written character string along the vertical first direction 4 (the left-right direction in FIG. 9A).

  Therefore, in the present embodiment, in response to the above, when the handwriting input device 1 is used, setting input regarding the writing direction by the electronic pen 2 is performed. Thereafter, the stroke data generated based on the magnetic field reception result in the left sense coil unit 110L, that is, the writing direction corresponding to the first stroke data described later, that is, the first calculated writing direction described later, and the right sense coil unit 110R. Stroke data generated based on the received magnetic field, that is, a writing direction corresponding to second stroke data described later, that is, a second calculated writing direction described later. Then, it is determined whether or not the calculated first calculated writing direction and second calculated writing direction match the set writing direction, that is, a set writing direction described later, and the set writing direction. Is stored, and stroke data corresponding to the calculated writing direction determined not to match the set writing direction is cleared. The contents of the control process performed by the CPU 80a of the coordinate detection device 3 in order to realize such a function will be described in order with reference to FIGS.

  11, 12, and 13, this process is started when the user turns on the power of the coordinate detection device 3. First, as shown in FIG. 11, in step SS10, the CPU 80a initializes an error variable Ce representing the number of times regarded as an error described later to 0.

  Thereafter, in step SS20, the CPU 80a selects a writing mode for the notebook 30 from among right vertical writing, left vertical writing, right horizontal writing, and left horizontal writing based on an input operation by a user through an appropriate operation means. Enter the settings. This substantially corresponds to performing setting input related to the writing direction by the electronic pen 2, that is, the above-described writing direction WD and line progression direction LD. In addition, the procedure of this step SS20 functions as a writing direction setting means described in each claim. In the present embodiment, the use of the coordinate detection device 3 in a vertical position (how to place FIG. 4A) is preset as a default. In step SS20, based on the input operation by the user via the operation means, setting input is performed to determine whether the coordinate detection device 3 is used in the vertical position or in the horizontal position (how to place in FIG. 4B). You may make it do.

  Then, the process proceeds to Step SS30, and the CPU 80a starts scanning processing of the left sense coil unit 110L corresponding to the left sheet unit 10L and the right sense coil unit 110R corresponding to the right sheet unit 10R. While the scan processing of the sense coil units 110L and 110R is being executed, the CPU 80a determines whether any one of the left sense coils LX1 to LXm and LY1 to LYn, and the right sense coils RX1 to RXm and RY1 to RYn. A coil selection signal S3 (see FIG. 2) for alternately selecting any one of the sense coils is output to the MUX 62. As a result, the magnetic field of the predetermined frequency generated from the LC oscillation circuit 41 with the tip switch 42 of the electronic pen 2 turned on and the magnetism between the sense coils LX1 to LXm, LY1 to LYn, RX1 to RXm, and RY1 to RYn. Signal S1 (see FIG. 2) is generated by induction. Then, the signal S1 from the sense coils LX1 to LXm, LY1 to LYn, RX1 to RXm, and RY1 to RYn selected by the MUX 62 in a state where the signal S1 is generated is amplified by the amplifier circuit 64, and is amplified by the rectifier circuit 66. Amplitude detection is performed and the signal S14 (see FIG. 2) is input to the microcomputer 80.

  After that, in step SS40, the CPU 80a detects a signal S14 based on the magnetic field generated from the electronic pen 2 and the magnetic induction between the sense coils LX1 to LXm, LY1 to LYn, RX1 to RXm, and RY1 to RYn. It is determined whether a coil output is obtained. Until the coil output of a certain value or more is obtained, the determination at Step SS40 is not satisfied, and loops and waits. When the coil output of a certain value or more is obtained, the determination of Step SS40 is satisfied, and the process proceeds to Step SS50.

  In step SS50, the CPU 80a obtains a coil output of a certain value or more from the signal S14 based on the magnetic field generated from the electronic pen 2 and the magnetic induction of the left sense coils LX1 to LXm, LY1 to LYn, and the electronic pen 2 It is determined whether a coil output of a certain value or more has been obtained from the signal S14 based on the magnetic field generated from the magnetic field induction and the magnetic induction between the right-side sense coils RX1 to RXm and RY1 to RYn. In other words, it is determined whether the magnetic field generated from the electronic pen 2 is received by both the left sense coils LX1 to LXm and LY1 to LYn and the right sense coils RX1 to RXm and RY1 to RYn. That is, in this step SS50, it is determined whether or not the notebook 30 is used in the above-mentioned inverted state (the state shown in FIGS. 9A and 9B).

  In Step SS50, when a magnetic field generated from the electronic pen 2 is received by only one of the left sense coils LX1 to LXm, LY1 to LYn and the right sense coils RX1 to RXm, RY1 to RYn. Is considered not to be used in the flipped state, that is, used in the spread state (the state of FIG. 1 (a) and FIG. 1 (b)), the determination of step SS50 is not satisfied, Move on to step SS60.

  In step SS60, the CPU 80a writes the left writing surface 31L on the left sheet portion 10L side and the right writing surface 31R on the right sheet portion 10R side on the sense coil side where the magnetic field generated from the electronic pen 2 has been received. 31 is recognized as a page on which writing is performed by the user, that is, an active page. Then, the process proceeds to Step SS190 described later.

  On the other hand, in step SS50, the magnetic field generated from the electronic pen 2 is received at a level equal to or higher than a predetermined value in both the left sense coils LX1 to LXm, LY1 to LYn and the right sense coils RX1 to RXm, RY1 to RYn. If it is determined that the notebook 30 has been used in the inverted state, the determination at Step SS50 is satisfied, and the routine goes to Step SS70.

  In step SS70, the CPU 80a acquires, that is, calculates the coordinate data of the electronic pen 2 based on the scan results of the sense coil units 110L and 110R started in step SS30. Details of the calculation of the coordinate data will be described below in order.

(1) Position Coordinate Table As described above, the coordinate data is calculated using the position coordinate table stored in the ROM 80b of the microcomputer 80. The position coordinate table will be described with reference to FIGS. 14 (a), 14 (b), 14 (c), 15 (a), and 15 (b). In FIG. 14A, in order to facilitate understanding of the arrangement of the left sense coils LX1 to LX3, each side of the left sense coils LX1 to LX3 is illustrated so as not to overlap.

  In FIG. 14A, the center lines of the three left-side sense coils LX1, LX2, and LX3 are C1, C2, and C3, respectively. The voltage values ex1, ex2, and ex3 generated in the left sense coils LX1, LX2, and LX3 are maximized at the centers C1 to C3 of the left sense coils LX1 to LX3, respectively, as shown in FIG. 14B. At this time, as described above, the left-side sense coils LX1 to LX3 are overlapped with a width that is one-half of the width P1 in the x-axis direction so that the null point of the left-side sense coil is outside the center of the adjacent sense coil. ing.

  At this time, as shown in FIG. 14C, the voltage difference between the sense coils adjacent to the left sense coils LX1 to LX3 becomes maximum on the centers C1 to C3 of the left sense coils LX1 to LX3, respectively. . In addition, the voltage difference becomes a minimum value at the midpoint between the center of the left sense coils LX1 to LX3 and the portion where the adjacent left sense coils LX1 to LX3 overlap each other. For example, in FIG. 14C, the right half of the graph of (ex1-ex2), that is, the portion indicated by the solid line, is from the center C1 of the left sense coil LX1 to the middle point Q1 of the portion where the left sense coil LX2 is overlapped. It shows the behavior of ex1-ex2 at a distance, that is, a quarter of P1, which is a half of the overlapping pitch.

  Assuming that the electronic pen 2 exists at the intermediate point Q2, if (ex1-ex2) is detected, the distance ΔX1 from the center C1 to the intermediate point Q2 can be detected, and as a result, the x coordinate of the intermediate point Q2 is obtained. It is done. If the width P1 of the left sense coils LX1 to LX3 is 50 mm, ΔX = P1 / 4 = 12.5 mm. Therefore, for example, when the solid line portion indicating the characteristics of (ex1-ex2) in FIG. 14C is converted into 8-bit digital data, the graph shown in FIG. 15A is obtained. By converting this graph into a table format, a position coordinate table shown in FIG. 15B is obtained.

(2) Coordinate determination using coil voltage value As described above, signals generated by magnetic induction between the magnetic field generated from the electronic pen 2 and the sense coils LX1 to LXm, LY1 to LYn, RX1 to RXm, RY1 to RYn S1 is amplified by the amplifier circuit 64, subjected to amplitude detection by the rectifier circuit 66, and input to the microcomputer 80 as a signal S14 (see FIG. 2). The microcomputer 80 converts the input signal S14 into a digital signal corresponding to the amplitude, that is, the voltage value. The CPU 80a uses the voltage value represented by the digital signal to determine the coordinates of the electronic pen 2 using the position coordinate table described above. Hereinafter, the detailed procedure for determining the coordinates will be described taking the left-side sense coils LX1 to LXm as an example among the sense coils LX1 to LXm, LY1 to LYn, RX1 to RXm, and RY1 to RYn.

  First, the CPU 80a sequentially stores the voltage values e1 to em indicated by the digital signal converted from the signal S14 in the voltage value storage area of the RAM 80c in association with the coil numbers of the left sense coils LX1 to LXm.

  Thereafter, the CPU 80a selects the maximum voltage value emax among the voltage values e1 to em stored in the voltage value storage area in association with the coil numbers of the left sense coils LX1 to LXm. Then, the CPU 80a stores the coil number Xmax of the left sense coils X1 to Xm that have generated the voltage value emax in the RAM 80c.

  Next, the CPU 80a determines the larger one of the voltage values e1 to em of the left sense coils LX1 to LXm adjacent to the left sense coils LX1 to LXm that have generated the voltage value emax. Then, the CPU 80a stores the coil numbers of the left sense coils LX1 to LXm that have generated the determined voltage values e1 to em as the coil number Xmax2 in the RAM 80c. For example, when the voltage value emax is generated by the left side sense coil LX2, the CPU 80a compares the voltage value e1 of the left side sense coil LX1 on both sides thereof with the voltage value e3 of the left side sense coil LX3, and the large voltage value e1 or voltage The value e3 is determined. Then, the CPU 80a stores the coil number of the left sense coil LX1 that has generated the determined voltage value e1 or the coil number of the left sense coil LX3 that has generated the voltage value e3 in the RAM 80c as the coil number Xmax2.

  Thereafter, the CPU 80a compares the coil number max and the coil number max2 stored in the RAM 80c, and determines whether the coil number max2 is present in the + or − direction of the x axis from the coil number max. Note that the + direction of the x axis is the direction of the arrow indicating the x axis in FIG. 3A, and the opposite direction is the negative direction of the x axis. As a result of the determination, when the coil number Xmax2 is in the + direction with respect to the coil number Xmax, the CPU 80a sets the variable SIDE to 1. On the other hand, when the coil number Xmax2 is in the negative direction with respect to the coil number Xmax, the CPU 80a sets the variable SIDE to -1. For example, when the voltage value emax is generated by the left sense coil LX2, the coil number indicating the left sense coil LX2 is stored in the RAM 80c as the coil number Xmax, and the coil number of the left sense coil LX3 is stored as the coil number Xmax2. The CPU 80a sets the variable SIDE to 1. On the other hand, when the voltage value emax is generated by the left sense coil LX2, the coil number indicating the left sense coil LX2 is stored in the RAM 80c as the coil number Xmax, and the coil number of the left sense coil LX1 is stored as the coil number Xmax2. The CPU 80a sets the variable SIDE to -1.

And CPU80a which set the variable SIDE calculates the variable DIFF by the following (Formula 1).
DIFF = e (max) −e (max2) (Formula 1)
The CPU 80a reads the position coordinate closest to the calculated DIFF from the position coordinate table (see FIG. 15B) stored in advance in the ROM 80b. Then, the CPU 80a sets the position coordinates read from the position coordinate table as a variable OFFSET.

Thereafter, the CPU 80a uses the variable SIDE and the variable OFFSET calculated as described above to obtain an x coordinate indicating the position of the electronic pen 2 in the x-axis direction according to the following (Equation 2).
X1 = (P1 / 2) × max + OFFSET × SIDE (Expression 2)
Here, (P1 / 2) × max indicates the x coordinate of the center of the coil number max.

  In the above description, the calculation of the x coordinate of the electronic pen 2 by the signal S14 based on the magnetic induction in the left sense coils LX1 to LXm in the x-axis direction has been described as an example. The y coordinate of the electronic pen 2 is also calculated by a similar method using the signal S14 based on the magnetic induction in the left sense coils LY1 to LYn in the y-axis direction. Further, the x coordinate and the y coordinate of the electronic pen 2 by the signal S14 based on the magnetic induction in the right sense coils RX1 to RXm, RY1 to RYn are also calculated by the same method.

  As described above, in step SS70, the CPU 80a performs the above methods (1) and (2) based on the reception results of the magnetic fields in the sense coils LX1 to LXm, LY1 to LYn, RX1 to RXm, and RY1 to RYn. The coordinate data (x, y) of the electronic pen 2 is calculated. Specifically, the CPU 80a determines the coordinate data (x, y) of the electronic pen 2 based on the reception results of the magnetic fields of the left sense coils LX1 to LXm, LY1 to LYn and the right sense coils RX1 to RXm, RY1 to RYn. ) Respectively. After step SS70 is completed in this way, the process proceeds to step SS80.

  In step SS80, the CPU 80a generates pen position data strings D1, D2 using the coordinate data (x, y) calculated in step SS70. Specifically, at the end of the first pen position data sequence D1 composed of a plurality of coordinate data (x, y) calculated based on the reception results of the magnetic fields in the left sense coils LX1 to LXm, LY1 to LYn, the left side Coordinate data (x, y) calculated based on the magnetic field reception results in the sense coils LX1 to LXm and LY1 to LYn is added to obtain a new first pen position data string D1. In addition, when the coordinate data (x, y) calculated based on the reception result of the magnetic field in the left sense coils LX1 to LXm and LY1 to LYn is the first coordinate data, a new one is generated by the one coordinate data. A first pen position data string D1 is generated. At the same time, at the end of the second pen position data sequence D2 composed of a plurality of coordinate data (x, y) calculated based on the reception results of the magnetic fields at the right sense coils RX1 to RXm, RY1 to RYn, Coordinate data (x, y) calculated based on the magnetic field reception results in the sense coils RX1 to RXm and RY1 to RYn is added to obtain a new second pen position data string D2. If the coordinate data (x, y) calculated based on the magnetic field reception results in the right sense coils RX1 to RXm, RY1 to RYn is the first coordinate data, a new one is generated by the one coordinate data. A second pen position data string D2 is generated. The pen position data sequences D1 and D2 generated in this way are temporarily stored in the RAM 80c of the microcomputer 80, respectively.

  The pen position data string D enables the electronic pen 2 to acquire stroke data corresponding to the character string written on the writing surface 31. That is, the generation of the pen position data string D is equivalent to the generation of the stroke data in other words. Specifically, according to the first pen position data string D1, the electronic pen 2 corresponds to the stroke data corresponding to the character string described on the left writing surface 31L, that is, the first stroke corresponding to the left sense coils LX1 to LXm, LY1 to LYn. Data can be acquired. In other words, the generation of the first pen position data string D1 is equivalent to the generation of the first stroke data. Further, the second pen position data string D2 obtains stroke data corresponding to the character string written on the right writing surface 31R by the electronic pen 2, that is, second stroke data corresponding to the right sense coils RX1 to RXm, RY1 to RYn. Is possible. In other words, the generation of the second pen position data sequence D2 is equivalent to the generation of the second stroke data.

  Then, the process proceeds to step SS90, and the CPU 80a determines whether or not a predetermined time has elapsed since the pen position data strings D1 and D2 were generated in step SS80. Until the predetermined time elapses, the determination in step SS90 is not satisfied, and step SS70 and step SS80 are repeatedly executed, and pen position data strings D1 and D2 are stored in the RAM 80c. And when predetermined time passes, the determination of step SS90 is satisfy | filled and it moves to step SS100.

  In step SS100, the CPU 80a includes the first stroke data based on the first pen position data string D1 generated in step SS80 and stored in the RAM 80c, using the known appropriate technique. Each character data is recognized separately. At the same time, the CPU 80a includes the second stroke data based on the second pen position data string D2 generated in step SS80 and stored in the RAM 80c by using a known appropriate method. Each character data is recognized separately. The procedure of step SS100 functions as character recognition means described in each claim.

  Thereafter, in step SS110, the CPU 80a changes the time series of stroke data based on the pen position data sequence D generated in step SS80 and stored in the RAM 80c, specifically, the additional behavior of character data recognized in step SS100. Based on the above, the writing direction by the electronic pen 2 is calculated. More specifically, the CPU 80a determines the writing direction by the electronic pen 2, that is, the above-described writing direction WD and the above-described writing direction WD based on the direction newly added as character data of the plurality of character data recognized in step SS100. The line progression direction LD is calculated. Hereinafter, an example of the calculation method will be described with reference to FIGS. 16 (a) and 16 (b).

  First, the CPU 80a compares the center coordinates of the character data corresponding to the first character and the center coordinates of the character data corresponding to the second character among the plurality of character data recognized in step SS100. Thereby, whether the center coordinate of the character data corresponding to the second character exists in the + direction or the − direction of the x axis from the center coordinate of the character data corresponding to the first character, and the y axis It detects whether it exists in + direction or-direction. Then, based on the detection result, the writing direction WD and the line progression direction LD are calculated. That is, as described above, since the x-axis direction corresponds to the first direction 4 and the y-axis direction corresponds to the second direction 5, the character corresponding to the second character with respect to the character data corresponding to the first character. The writing direction WD and the line progression direction LD can be calculated based on the additional behavior of the data.

  In FIG. 16A, this corresponds to the user writing the character string “Today is sunny” on the writing surface 31 with the notebook 30 in the left vertical writing direction, and the corresponding information stored in the RAM 80c. Stroke data “Today is sunny” is distinguished for each character data “Book”, “Day”, “Ha”, “Sunny”, “Ten”, “N” and “Ri” included in the stroke data by a known appropriate method. The recognized state is illustrated. The center coordinates of the recognized seven character data “book”, “day”, “ha”, “sunny”, “heaven”, “na”, “ri” are respectively (x1, y1) (x2, y2) (x3, y3). ) (X4, y4) (x5, y5) (x6, y6) (x7, y7).

  In such a case, the CPU 80a firstly sets the character data of the first character among the recognized seven character data “book”, “day”, “ha”, “sunny”, “heaven”, “na”, and “ri”. The center coordinates (x1, y1) of the character data “book” corresponding to “2” and the center coordinates (x2, y2) of the character data “day” corresponding to the second character are acquired. Then, whether the center coordinates (x2, y2) of the character data “day” are present in the + direction or the − direction of the x axis from the center coordinates (x1, y1) of the character data “book”, and It detects whether it exists in the + direction or the − direction of the y-axis.

  For example, in FIG. 14B, the central coordinates (x1, y1) of the character data “book” are point a, the central coordinates (x2, y2) of the character data “day” are the point b, and the point a and the point The positional relationship of b in the xy coordinate system is illustrated. In this example, since the coordinate detector 3 is assumed to be used vertically, the x-axis direction (left-right direction in the figure) corresponds to the first vertical direction 4 and y-axis direction (up-down direction in the figure). Corresponds to the second direction 5 in the vertical position. In this example, since the point b exists from the point a in the + direction of the x-axis (right direction in the drawing), the character data addition behavior is a behavior in which character data is added from left to right. That is, it is left horizontal writing. In such a case, the CPU 80a changes the writing direction of the electronic pen 2 from the left to the right along the first vertical direction 4 corresponding to the left horizontal writing in the vertical position, and , And calculated as a row traveling direction LD that travels from top to bottom along the second vertical direction 5 (vertical direction in the figure).

  As described above, in step SS110, the CPU 80a calculates the writing direction by the electronic pen 2, that is, the calculated writing direction, by the method described above. Specifically, the CPU 80a calculates a calculated writing direction corresponding to the first stroke data based on the first pen position data sequence D1 generated in step SS80 and stored in the RAM 80c, that is, the first calculated writing direction. At the same time, a calculated writing direction corresponding to the second stroke data based on the second pen position data string D2, that is, a second calculated writing direction is calculated. After step SS110 is completed in this way, the process proceeds to step SS120. In addition, the procedure of this step SS110 functions as a writing direction calculation means described in each claim.

  In step SS120, the CPU 80a determines whether or not the writing direction WD related to the first calculated writing direction and the second calculated writing direction calculated in step SS110 is a direction along the first direction 4. When the writing direction WD related to the first calculated writing direction and the second calculated writing direction is the direction along the first direction 4, the determination in step SS120 is satisfied, and the process proceeds to step SS130.

  In step SS130, the CPU 80a determines the writing direction WD related to the first calculated writing direction and the writing direction WD related to the second calculated writing direction calculated in step SS110. That is, in step SS130, the first calculated writing direction and the second calculated writing direction related to the first direction 4 out of the first calculated writing direction and the second calculated writing direction calculated in step SS110. Each direction WD is determined. Thereafter, the process proceeds to Step SS150 described later.

  On the other hand, in step SS120, when the writing direction WD related to the first calculated writing direction and the second calculated writing direction is not the direction along the first direction 4, that is, in the first calculated writing direction and the second calculated writing direction. If the writing direction WD concerned is a direction along the second direction 5, the determination at step SS120 is not satisfied, and the routine goes to step SS140.

  In step SS140, the CPU 80a determines the line progression direction LD related to the first calculated writing direction and the line progression direction LD related to the second calculated writing direction, respectively, calculated in step SS110. That is, in step SS140, the CPU 80a uses the first calculated writing direction and the second calculated writing direction related to the first direction 4 out of the first calculated writing direction and the second calculated writing direction calculated in step SS110. Each line traveling direction LD is discriminated.

  Then, the process proceeds to step SS150, and the CPU 80a determines whether or not the first calculated writing direction calculated in step SS110 and the writing direction set in step SS20, that is, the set writing direction match. Specifically, the CPU 80a determines whether or not the first calculated writing direction related to the first direction 4 and the set writing direction among the first calculated writing directions match. If the first calculated writing direction related to the first direction 4 matches the set writing direction, the determination at step SS150 is satisfied, and the routine goes to step SS160.

  In step SS160, the CPU 80a recognizes the left writing surface 31L on the left sheet portion 10L side as the aforementioned active page. Thereafter, the process proceeds to Step SS190 described later.

  On the other hand, if the first calculated writing direction and the set writing direction related to the first direction 4 do not match in step SS150, the determination in step SS150 is not satisfied, and the process proceeds to step SS170.

  In Step SS170, the CPU 80a determines whether or not the second calculated writing direction calculated in Step SS110 matches the set writing direction set in Step SS20. Specifically, the CPU 80a determines whether or not the second calculated writing direction related to the first direction 4 and the set writing direction among the second calculated writing directions match. If the second calculated writing direction related to the first direction 4 matches the set writing direction, the determination at Step SS170 is satisfied, and the routine goes to Step SS180.

  In step SS180, the CPU 80a recognizes the right writing surface 31R on the right sheet portion 10R side as the above-described active page.

  Thereafter, in step SS190, the CPU 80a, among the pen position data strings D1 and D2 stored in the RAM 80c at this time, the writing surface 31, which has not been recognized as the active page in step SS60, step SS160, or step SS180, That is, the pen position data string D corresponding to the sense coil on the non-active page side is erased, that is, cleared. Specifically, when it is determined in step SS150 that the first calculated writing direction related to the first direction 4 coincides with the set writing direction and the left writing surface 31L is recognized as an active page, the CPU 80a is reversed. The second pen position data string D2 corresponding to the right sense coils RX1 to RXm and RY1 to RYn on the right writing surface 31R side is cleared. On the other hand, if it is determined in step SS170 that the second calculated writing direction related to the first direction 4 matches the set writing direction and the right writing surface 31R is recognized as the active page, the CPU 80a determines that the left side on the opposite side The first pen position data string D1 corresponding to the left-side sense coils LX1 to LXm and LY1 to LYn on the writing surface 31L side is cleared. Note that clearing the second pen position data string D2 is equivalent to clearing the second stroke data in other words. In addition, clearing the first pen position data string D1 is equivalent to clearing the first stroke data. That is, the procedure of step SS190 functions as data erasing means described in each claim. When step SS190 is completed, the process proceeds to step SS200 shown in FIG.

  As shown in FIG. 12, in step SS200, the CPU 80a stops the scanning process of the sense coil unit 110 on the writing surface 31 side that has not been recognized as an active page in step SS60, step SS160, or step SS180, and the above step Only the scanning process of the sense coil unit 110 on the writing surface 31 side recognized as the active page in SS60, step SS160, or step SS180 is continued.

  Thereafter, in step SS210, the CPU 80a scans the sense coil unit 110 on the writing surface 31 side recognized as the active page in step SS60, step SS160, or step SS180, that is, the sense coil of the sense coil unit 110. Based on the reception result of the magnetic field, the coordinate data (x, y) of the electronic pen 2 is calculated by the above-described methods (1) and (2).

  Then, the process proceeds to step SS220, and the CPU 80a generates a pen position data string D using the coordinate data (x, y) calculated in step SS210. Specifically, at the end of the pen position data sequence D composed of a plurality of coordinate data (x, y) calculated based on the reception result of the magnetic field in the sense coil on the writing surface 31 side recognized as the active page. Then, coordinate data (x, y) calculated based on the reception result of the magnetic field by the sense coil on the writing surface 31 side is added, and temporarily stored in the RAM 80c as a new pen position data string D.

  Thereafter, in step SS230, the CPU 80a determines whether or not the user has performed a page turning operation using the above-described page switching button. While the page switching operation by the user is not performed, the determination at Step SS230 is not satisfied, and Step SS210 and Step SS220 are repeatedly executed, and the pen position data string D is stored in the RAM 80c. If the user performs a page switching operation, the determination at Step SS230 is satisfied, and the routine goes to Step SS240.

  In step SS240, the CPU 80a accumulates, that is, stores the pen position data string D generated at this time and stored in the RAM 80c in the flash memory 72 (see FIG. 2). Specifically, when it is determined in step SS150 that the first calculated writing direction related to the first direction 4 matches the set writing direction, and the left writing surface 31L is recognized as an active page, the CPU 80a The first pen position data string D1 corresponding to the first calculated writing direction, that is, corresponding to the left sense coils LX1 to LXm and LY1 to LYn on the left writing surface 31L side is stored in the flash memory 72. On the other hand, if it is determined in step SS170 that the second calculated writing direction related to the first direction 4 matches the set writing direction, and the right writing surface 31R is recognized as an active page, the CPU 80a performs the second calculation. The second pen position data string D2 corresponding to the writing direction, that is, corresponding to the right sense coils RX1 to RXm and RY1 to RYn on the right writing surface 31R side is stored in the flash memory 72. In this way, by storing the pen position data sequence D composed of a plurality of continuous coordinate data (x, y), the stroke data corresponding to the pen position data sequence D is stored in the electronic file as a result. be able to. That is, by storing the first pen position data string D1, as a result, the first stroke data corresponding to the first pen position data string D1 can be stored in the electronic file, and the second pen position data string By saving D2, as a result, the second stroke data corresponding to the second pen position data string D2 can be saved in the electronic file. And it returns to step SS30 shown in the said FIG. 11, and repeats the same procedure. The procedure of step SS240 functions as data storage means described in each claim.

  The pen position data string D (stroke data) stored in the electronic file of the flash memory 72 in step SS240 is displayed on the display unit 76 (see FIG. 2) by the user through an appropriate operation by the user. It can be displayed and used as a written character string. Alternatively, it is provided to an external device such as a personal computer via the communication interface 74 (see FIG. 2), and can be displayed and used as a character string written by the user by the external device.

  Returning to FIG. 11, when the second calculated writing direction and the set writing direction related to the first direction 4 do not match in step SS170, the determination in step SS170 is not satisfied, and the process proceeds to step SS250 shown in FIG.

  As shown in FIG. 13, in step SS250, the CPU 80a generates a display signal for a confirmation screen for confirming whether or not the notebook 30, that is, the coordinate detection device 3 is used vertically (placement as shown in FIG. 4A). Generate and output to the display unit 76. As a result, the confirmation screen is displayed on the display unit 76, and the user is prompted to confirm. Then, the CPU 80a determines whether or not the coordinate detection device 3 is being used in a vertical orientation based on an operation through an appropriate operation means by a user who has viewed the confirmation screen displayed on the display unit 76. When the coordinate detection device 3 is not used in the vertical position, that is, when the coordinate detection device 3 is used in the horizontal position (how to place in FIG. 4B), the determination in step SS250 is not satisfied, and the step Move on to SS260.

  In step SS260, the CPU 80a changes the setting of the coordinate detection device 3 to use in landscape orientation, returns to step SS20 shown in FIG. 11, and repeats the same procedure.

  On the other hand, when the coordinate detection device 3 is used in the vertical position in step SS250, it is regarded as an error, the determination in step SS250 is satisfied, and the process proceeds to step SS270.

  In step SS270, the CPU 80a adds 1 to the value of the error variable Ce described above, and proceeds to step SS280.

  In step SS280, the CPU 80a determines whether or not the value of the error variable Ce at this time is 3. If Ce <3, the determination in step SS280 is not satisfied, and the process returns to step SS30 in FIG. 11 and the same procedure is repeated. On the other hand, if Ce = 3, the determination at step SS280 is satisfied, and the routine goes to step SS290.

  In step SS290, the CPU 80a generates a display signal for a predetermined error screen and outputs it to the display unit 76. As a result, a predetermined error screen is displayed on the display unit 76.

  Then, in step SS300, the CPU 80a scans the sense coil units 110L and 110R, that is, the magnetic field in the sense coils LX1 to LXm, LY1 to LYn, RX1 to RXm, and RY1 to RYn of the sense coil units 110L and 110R. Based on the reception result, the coordinate data (x, y) of the electronic pen 2 is calculated by the above-described methods (1) and (2).

  Thereafter, in step SS310, the CPU 80a generates the above-described pen position data strings D1, D2 using the coordinate data (x, y) calculated in step SS300, and temporarily stores them in the RAM 80c.

  Then, proceeding to step SS320, the CPU 80a determines whether or not the user has performed a page turning operation using the page switching button. While the page switching operation by the user is not performed, the determination in step SS320 is not satisfied, and step SS300 and step SS310 are repeatedly executed, and pen position data strings D1 and D2 are stored in the RAM 80c. If the user performs a page switching operation, the determination at step SS320 is satisfied, and the routine goes to step SS330.

  In step SS330, the CPU 80a stores the pen position data strings D1 and D2 that have been generated and stored in the RAM 80c at this time in the flash memory 72. In this way, by storing the pen position data sequences D1 and D2 composed of a plurality of continuous coordinate data (x, y), the first stroke data corresponding to the pen position data sequences D1 and D2 is consequently obtained. And the second stroke data can be stored in an electronic file. Then, it returns to step SS30 shown in the said FIG. 11, and repeats the same procedure.

  Of the pen position data sequences D1 and D2 (first stroke data and second stroke data) stored in the electronic file of the flash memory 72 in step SS330, stroke data based on one pen position data sequence D is: Incorrect stroke data. However, it is possible to display the first stroke data and the second stroke data on the display unit 76 by an appropriate operation by the user and to select the correct stroke data corresponding to the character string written by the user. The person can use the correct stroke data. Alternatively, it is provided to an external device such as a personal computer via the communication interface 74, and the external device displays the first stroke data and the second stroke data, and the correct stroke corresponding to the character string written to the user. By selecting the data, the user can use the correct stroke data. This flow ends when, for example, the user turns off the power of the coordinate detection device 3.

  In the above, the procedures of Step SS30 and Step SS70 in FIG. 11, Step SS210 in FIG. 12, and Step SS300 in FIG. 13 function as the position acquisition means described in each claim. Further, the procedure of Step SS80 in FIG. 11, Step SS220 in FIG. 12, and Step SS310 in FIG. 13 functions as a stroke data generation unit. Furthermore, the procedure of step SS150 and step SS170 of FIG. 11 functions as a writing direction determination means.

  As described above, in the handwriting input device 1 of the present embodiment, setting input related to the writing direction by the electronic pen 2 is performed based on the input operation by the user via an appropriate operation means (step SS20 in FIG. 11). See). Thereafter, when the user writes a desired character on the writing surface 31 using the electronic pen 2, the position of the electronic pen 2 is changed by the writing operation of the user, and the magnetic field generated from the electronic pen 2 is changed. Based on the magnetic induction with the sense coils LX1 to LXm, LY1 to LYn, RX1 to RXm, and RY1 to RYn, coordinate data of the electronic pen corresponding to the change is calculated. Then, when stroke data based on the pen position data sequence D corresponding to the character string written on the writing surface 31 is sequentially generated by using the acquired coordinate data, based on the time series change of the stroke data. The writing direction of the electronic pen 2 is calculated (see step SS110 in FIG. 11). Then, it is determined whether or not the calculated writing direction calculated as described above matches the set writing direction set and input as described above (see step SS150 and step SS170 in FIG. 11). . If it is determined that the calculated writing direction does not match the set writing direction, erroneous stroke data is generated based on the reception result in the sense coil on the side opposite to the original sheet side. On the other hand, if it is determined that the calculated writing direction and the set writing direction match, the correct stroke data is generated based on the reception result in the sense coil on the original sheet side, so the stroke at this time Data is accumulated in the flash memory 72 (see step SS240 in FIG. 12).

  As described above, in the present embodiment, correct stroke data can be reliably generated even when the notebook 30 is used in an inverted state in which the front cover and the back cover are substantially close to each other.

  In the present embodiment, in particular, the pen position data string D1 respectively generated corresponding to the magnetic induction of the left sense coils LX1 to LXm, LY1 to LYn, the right sense coils RX1 to RXm, RY1 to RYn, and the magnetic field. , D2, the pen position data string D whose calculated writing direction matches the set writing direction is stored in the flash memory 72. At the same time, the pen position data string D in which the calculated writing direction does not match the set writing direction is cleared from the pen position data strings D1 and D2 (see step SS190 in FIG. 11). That is, after generating both correct stroke data and incorrect stroke data, the incorrect stroke data is deleted. Thereby, correct stroke data can be generated reliably. In addition, it is possible to perform highly reliable processing as compared to the case where erroneous stroke data is corrected and used.

  Further, as described above, erroneous stroke data can be generated when the cover and the back cover are turned upside down via the folding line T (the states of FIGS. 9A and 9B). This is due to the proximity. In this case, there is little difference between the distance between the electronic pen 2 and the left side sense coils LX1 to LXm, LY1 to LYn and the distance between the electronic pen 2 and the right side sense coils RX1 to RXm, RY1 to RYn. It is not known which sense coil corresponding to the writing surface 31 of the note 30 is the left sense coil LX1 to LXm, LY1 to LYn or the right sense coil RX1 to RXm, RY1 to RYn.

  Here, in the case where the left sheet portion 10L, the bent portion 10T, and the right sheet portion 10R are arranged in this order along the first direction 4, the left sheet portion 10L and the right sheet portion 10R are bent. With respect to the bending line T of the portion 10T, the positional relationship is axisymmetric. Accordingly, among the writing directions calculated based on the writing operation of the user, the writing direction related to the direction of the folding line T, that is, the direction orthogonal to the first direction T is received by the left sense coils LX1 to LXm, LY1 to LYn. Even when calculated based on the result, the same direction is obtained even when calculated based on the reception results of the right-side sense coils RX1 to RXm, RY1 to RYn. On the other hand, among the calculated writing directions calculated based on the user's writing operation, the direction perpendicular to the folding line T, that is, the calculated writing direction related to the first direction 4 is the left sense coils LX1 to LXm, LY1. The calculation is based on the reception result of LYn, and the calculation is based on the reception results of the right sense coils RX1 to RXm, RY1 to RYn.

  Therefore, in this embodiment, in particular, in step SS150 and step SS170 in FIG. 11, it is determined whether or not the calculated writing direction in the first direction 4 matches the set writing direction. Thereby, it is possible to reliably identify which sense coil is a sense coil related to generation of a correct character string.

  In the present embodiment, in particular, stroke data based on the pen position data string D generated as described above is recognized separately for each character data included in the stroke data (see step SS100 in FIG. 11). . Then, the writing direction by the electronic pen 2 is calculated based on the additional behavior of the character data recognized in this way. That is, the writing direction can be reliably calculated by cutting out character data included in the stroke data and recognizing in which direction new character data is added.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit and technical idea of the present invention. Hereinafter, such modifications will be described.

(A) When erroneous stroke data is inverted and stored In the above embodiment, erroneous stroke data whose calculated writing direction does not match the set writing direction is cleared without being saved, but is not limited thereto. . In other words, incorrect stroke data may be stored in a form of correct correction by mirror image conversion.

  In the present modification, the contents of the control process performed by the CPU 80a of the coordinate detection device 3 will be described in order with reference to FIG. 17, FIG. 18, and FIG. In addition, the same code | symbol is attached | subjected to the procedure equivalent to above-mentioned FIGS. 11-13, and description is abbreviate | omitted suitably.

  17, 18, and 19, this process is started when the user turns on the coordinate detection device 3. First, as illustrated in FIG. 17, the CPU 80 a performs setting input related to the writing direction with the electronic pen 2 through the same step SS10 and step SS20 as in FIG. 11 described above, and then proceeds to step SS25.

  In step SS25, the CPU 80a initializes a mirror image flag Fm described later to 0. Subsequent steps SS30 and SS40 are the same as those in FIG. 11 described above, and when a coil output of a predetermined value or more is obtained from the signal S14 (see FIG. 2), the process proceeds to step SS55.

  In step SS55, the CPU 80a starts the scan processing of the sense coil units 110L and 110R in the above-described step SS30, and first, the sense coil corresponding to the signal S14 that has obtained a coil output of a certain value or more, in other words, For example, first, the sense coil unit 110 including the sense coil that has received the magnetic field generated from the electronic pen 2 detects which of the left sense coil unit 110L and the right sense coil unit 110R is. Then, the scan process of the sense coil unit 110 opposite to the sense coil unit 110 including the sense coil that has received the magnetic field is stopped, and only the scan process of the sense coil unit 110 that includes the sense coil that has received the magnetic field is continued.

  Thereafter, in step SS72, the CPU 80a, based on the scan result of the sense coil unit 110 for which the scan process is being executed at this time, that is, the reception result of the magnetic field in the sense coil of the sense coil unit 110, is described above (1). The coordinate data (x, y) of the electronic pen 2 is calculated by the method (2). Specifically, when the scanning process of the left sense coil unit 110L is continued, the CPU 80a is based on the reception result of the magnetic field in the left sense coils LX1 to LXm and LY1 to LYn of the left sense coil unit 110L. The coordinate data (x, y) of the electronic pen 2 is calculated. On the other hand, when the scanning process of the right sense coil unit 110R is continued, the CPU 80a, based on the reception result of the magnetic field in the right sense coils RX1 to RXm, RY1 to RYn, the coordinate data (x , Y).

  Then, the process proceeds to step SS82, and the CPU 80a generates a pen position data string D using the coordinate data (x, y) calculated in step SS72. Specifically, when the scanning process of the left sense coil unit 110L is continued, the coordinate data (x, y) calculated based on the reception results of the magnetic fields in the left sense coils LX1 to LXm and LY1 to LYn. Is used to generate the first pen position data sequence D1 described above. On the other hand, when the scanning process of the right sense coil unit 110R is continued, the coordinate data (x, y) calculated based on the magnetic field reception results of the right sense coils RX1 to RXm and RY1 to RYn are used. The second pen position data sequence D2 is generated. The first pen position data string D1 or the second pen position data string D2 generated in this way is temporarily stored in the RAM 80c of the microcomputer 80.

  Thereafter, in step SS92, the CPU 80a determines whether or not a predetermined time has elapsed since the pen position data string D was generated in step SS82. Until the predetermined time elapses, the determination in step SS92 is not satisfied, and step SS72 and step SS82 are repeatedly executed, and the first pen position data string D1 or the second pen position data string D2 is stored in the RAM 80c. When the predetermined time has elapsed, the determination at Step SS92 is satisfied, and the routine goes to Step SS102.

  In step SS102, the CPU 80a distinguishes the stroke data based on the pen position data string D generated in step SS82 and stored in the RAM 80c for each character data included in the stroke data using a known appropriate method. recognize. In addition, the procedure of this step SS102 functions as the character recognition means described in each claim.

  Then, the process proceeds to Step SS112, and the CPU 80a calculates the calculated writing direction corresponding to the stroke data based on the pen position data string D generated in Step SS82 and stored in the RAM 80c by the method described above. Specifically, when the scanning process of the left sense coil unit 110L is continued, the CPU 80a calculates the first calculated writing direction corresponding to the first stroke data based on the first pen position data string D1. On the other hand, when the scan processing of the right sense coil unit 110R is continued, the CPU 80a calculates the second calculated writing direction corresponding to the second stroke data based on the second pen position data sequence D2. In addition, the procedure of this step SS112 functions as a writing direction calculation means described in each claim.

  Thereafter, in step SS122, the CPU 80a determines whether or not the writing direction WD related to the calculated writing direction calculated in step SS112 is a direction along the first direction 4. If the writing direction WD related to the calculated writing direction is the direction along the first direction 4, the determination at Step SS122 is satisfied, and the routine goes to Step SS132.

  In step SS132, the CPU 80a determines the writing direction WD related to the calculated writing direction calculated in step SS112. That is, in step SS132, the CPU 80a determines the writing direction WD that is the calculated writing direction related to the first direction 4 among the calculated writing directions calculated in step SS112. Thereafter, the process proceeds to Step SS152 described later.

  On the other hand, in step SS122, when the writing direction WD related to the calculated writing direction is not the direction along the first direction 4, that is, the writing direction WD related to the calculated writing direction is the direction along the second direction 5. If YES in step SS122, the determination in step SS122 is not satisfied, and the process proceeds to step SS142.

  In step SS142, the CPU 80a determines the line progression direction LD related to the calculated writing direction calculated in step SS112. That is, in this step SS142, the CPU 80a determines the line progression direction LD that is the calculated writing direction related to the first direction 4 among the calculated writing directions calculated in step SS112.

  Then, the process proceeds to Step SS152, and the CPU 80a matches the calculated writing direction related to the first direction 4 among the calculated writing directions calculated in Step SS112 and the set writing direction set in Step SS20 described above. It is determined whether or not to do. Specifically, when the scanning process of the left sense coil unit 110L is continued, the CPU 80a determines whether the first calculated writing direction related to the first direction 4 matches the set writing direction described above. Determine whether or not. On the other hand, when the scanning process of the right sense coil unit 110R is continued, the CPU 80a determines whether or not the second calculated writing direction related to the first direction 4 matches the above-described set writing direction. judge. If the first calculated writing direction related to the first direction 4 matches the set writing direction, or if the second calculated writing direction related to the first direction 4 matches the set writing direction, the determination in step SS152 Is satisfied, and the routine goes to Step SS212 described later. On the other hand, if the first calculated writing direction related to the first direction 4 does not match the set writing direction, or if the second calculated writing direction related to the first direction 4 does not match the set writing direction, step SS152. This determination is not satisfied, and the routine goes to Step SS172.

  In Step SS172, the CPU 80a matches the calculated writing direction related to the first direction 4 among the calculated writing directions calculated in Step SS112 and the set writing direction set in Step SS20 described above. It is determined whether or not to do. Specifically, when the scan processing of the left sense coil unit 110L is continued, the CPU 80a determines that the opposite direction of the first calculated writing direction related to the first direction 4 and the above-described set writing direction are It is determined whether or not they match. On the other hand, when the scanning process of the right sense coil unit 110R is continued, the CPU 80a determines whether the opposite direction of the second calculated writing direction related to the first direction 4 matches the set writing direction described above. Determine whether or not.

  In step SS172, when the opposite direction of the first calculated writing direction related to the first direction 4 matches the set writing direction, or the opposite direction of the second calculated writing direction related to the first direction 4 and the set writing direction are If they match, the determination at step SS172 is satisfied, and the routine goes to step SS174.

  In step SS174, the CPU 80a sets the mirror image flag Fm indicating that the generated stroke data is mirror image character data to 1. Thereafter, the process proceeds to step SS212 shown in FIG.

  As shown in FIG. 18, in step SS212, as in step SS72, the CPU 80a, based on the scan result of the sense coil unit 110 that is executing the scan process at this time, coordinates data (x, y) is calculated.

  Then, the process proceeds to step SS222, and the CPU 80a generates the pen position data sequence D using the coordinate data (x, y) calculated in step SS212, similarly to step SS82.

  Subsequent Step SS230 is substantially the same as that in FIG. 12 described above, and the CPU 80a determines whether or not the user has performed a page turning operation using the above-described page switching button. While the page switching operation by the user is not performed, the determination at Step SS230 is not satisfied, and Step SS212 and Step SS222 are repeatedly executed, and the first pen position data string D1 or the second pen position data string D2 is stored in the RAM 80c. . If the user performs a page switching operation, the determination at step SS230 is satisfied, and the routine goes to step SS235.

  In step SS235, the CPU 80a determines whether or not the mirror image flag Fm is 1. If Fm = 0, the determination at step SS235 is not satisfied, and the routine goes to step SS240A.

  In Step SS240A, the CPU 80a stores the pen position data string D that has been generated at this time and stored in the RAM 80c in the flash memory 72. Specifically, the scanning process of the left sense coil unit 110L is continued, and if it is determined in step SS152 that the first calculated writing direction and the set writing direction related to the first direction 4 match, the CPU 80a The first pen position data string D1 that has been generated and stored in the RAM 80c at this time is stored in the flash memory 72. On the other hand, if the scan processing of the right sense coil unit 110R is continued and it is determined in step SS152 that the second calculated writing direction and the set writing direction related to the first direction 4 match, the CPU 80a at this time The second pen position data string D2 that has been generated and saved in the RAM 80c is saved in the flash memory 72. Thereafter, the process returns to step SS30 in FIG. 17 and the same procedure is repeated.

  On the other hand, if Fm = 1 in Step SS235, the determination in Step SS235 is satisfied, and the routine goes to Step SS237.

  In step SS237, the CPU 80a relates the stroke data based on the pen position data string D that has been generated at this time and stored in the RAM 80c to the first direction 4 among the calculated writing directions calculated in step SS112. Mirror image conversion processing that is reversed along the calculated writing direction is performed. Specifically, the scanning process of the left sense coil unit 110L is continued, and when it is determined in step SS172 that the opposite direction of the first calculated writing direction with respect to the first direction 4 matches the set writing direction, The CPU 80a mirrors the first stroke data based on the first pen position data string D1 generated at this time and stored in the RAM 80c along the first calculated writing direction related to the first direction 4. I do. On the other hand, when the scanning process of the right sense coil unit 110R is continued and it is determined in step SS172 that the direction opposite to the second calculated writing direction related to the first direction 4 matches the set writing direction, the CPU 80a A mirror image conversion process for inverting the second stroke data based on the second pen position data string D2 that has been generated at this time and stored in the RAM 80c along the second calculated writing direction related to the first direction 4 is performed. In addition, the procedure of this step SS237 functions as the conversion means described in each claim.

  Then, the process proceeds to Step SS240B, and the CPU 80a stores the first stroke data or the second stroke data after the mirror image conversion process in Step SS237 in the flash memory 72. Thereafter, the process returns to step SS30 in FIG. 17 and the same procedure is repeated.

  Returning to FIG. 17, in step SS 172, when the opposite direction of the first calculated writing direction in the first direction 4 does not match the set writing direction, or the opposite direction of the second calculated writing direction in the first direction 4. If the set writing direction does not match, the determination at step SS172 is not satisfied, and the routine goes to step SS250 shown in FIG.

  As shown in FIG. 19, Step SS250, Step SS260, Step SS270, Step SS280, and Step SS290 are the same as those in FIG. In step SS290, when the CPU 80a generates a display signal for a predetermined error screen and outputs it to the display unit 76, the process proceeds to step SS295.

  In Step SS295, the CPU 80a starts, that is, restarts the scan processing of the sense coil units 110L and 110R, similarly to Step SS30 described above.

  Subsequent Step SS300, Step SS310, Step SS320, and Step SS330 are the same as those in FIG. This flow ends when, for example, the user turns off the power of the coordinate detection device 3.

  In the above, the procedures of Step SS30 and Step SS72 in FIG. 17, Step SS212 in FIG. 18, Step SS295 and Step SS300 in FIG. 19 function as the position acquisition means described in each claim. Further, the procedure of Step SS82 in FIG. 17, Step SS222 in FIG. 16, and Step SS310 in FIG. 19 functions as a stroke data generation unit. Furthermore, the procedure of step SS152 and step SS172 of FIG. 17 functions as a writing direction determination unit. Furthermore, the procedure of step SS240A and step SS240B of FIG. 18 functions as a data storage unit.

  Here, as described above, the first pen position data sequence D1 (first stroke data) that does not match the set writing direction generated corresponding to the reception results of the magnetic fields in the left sense coils LX1 to LXm, LY1 to LYn. ) Or the second pen position data sequence D2 (second stroke data) that does not coincide with the set writing direction generated corresponding to the magnetic field reception results of the right-side sense coils RX1 to RXm, RY1 to RYn, This is mirror image character data of a character string written by the user. In this modified example, the pen position data string corresponding to the above and whose calculated writing direction does not match the set writing direction as described above is subjected to mirror image conversion processing (see step SS237 in FIG. 18). Thus, correct stroke data can be reliably generated in the form of correct correction without deleting erroneous stroke data.

(B) When switching pages automatically In the above description, the page of the electronic file has been switched by the page turning operation using the page switching button by the user. However, the present invention is not limited to this. It may be detected and the page of the electronic file may be switched.

  In the present modification, the contents of the control process performed by the CPU 80a of the coordinate detection device 3 will be described in order with reference to FIG. 20, FIG. 21, FIG. 22, and FIG. In addition, the same code | symbol is attached | subjected to the procedure equivalent to above-mentioned FIGS. 11-13, and description is abbreviate | omitted suitably.

  20, 21, 22, and 23, this process is started when the user turns on the coordinate detection device 3. First, as shown in FIG. 20, in step SS10 ′, the CPU 80a initializes the error variable Ce described above to 0, and also sets a variable Pn representing the page number of the electronic file (hereinafter simply referred to as “page number Pn” as appropriate). Is initialized to 1.

  Subsequent Step SS20, Step SS30, and Step SS40 are the same as those in FIG. In step SS40, if a coil output of a certain value or more is obtained from the signal S14, the process proceeds to step SS50.

  Step SS50 is the same as that in FIG. 11 described above, and the CPU 80a is generated from the electronic pen 2 in both the left sense coils LX1 to LXm, LY1 to LYn and the right sense coils RX1 to RXm, RY1 to RYn. Determine whether a magnetic field has been received. In Step SS50, when a magnetic field generated from the electronic pen 2 is received by only one of the left sense coils LX1 to LXm, LY1 to LYn and the right sense coils RX1 to RXm, RY1 to RYn. Is not satisfied in step SS50, and the process proceeds to step SS60.

  Step SS60 is the same as that in FIG. 11 described above, and the CPU 80a recognizes the writing surface 31 on the sense coil side that has received the magnetic field generated from the electronic pen 2 as the active page described above. Then, the process proceeds to step SS62 shown in FIG.

  As shown in FIG. 21, in step SS62, the CPU 80a stops the scanning process of the sense coil unit 110 on the writing surface 31 side that has not been recognized as an active page in step SS60, and is recognized as an active page in step SS60. Only the scanning process of the sense coil unit 110 on the writing surface 31 side is continued.

  Thereafter, in step SS64, the CPU 80a, based on the scan result of the sense coil unit 110 on the writing surface 31 side recognized as the active page in step SS60, that is, the reception result of the magnetic field in the sense coil of the sense coil unit 110, The coordinate data (x, y) of the electronic pen 2 is calculated by the methods (1) and (2) described above.

  Then, the process proceeds to Step SS66, and the CPU 80a generates the above-described pen position data string D using the coordinate data (x, y) calculated in Step SS64, and temporarily stores it in the RAM 80c.

  In step SS68, the CPU 80a stores the pen position data string D generated at this time and stored in the RAM 80c in the flash memory 72. Then, it returns to step SS30 shown in the said FIG. 20, and repeats the same procedure.

  Returning to FIG. 20, when the magnetic field generated from the electronic pen 2 is received by both the left sense coils LX1 to LXm and LY1 to LYn and the right sense coils RX1 to RXm and RY1 to RYn in step SS50. If the determination at step SS50 is satisfied, the process proceeds to step SS70.

  Step SS70 and step SS80 are the same as those in FIG. In step SS80, the pen position data strings D1, D2 are generated using the coordinate data (x, y) calculated in step SS70 described above and temporarily stored in the RAM 80c of the microcomputer 80. Then, the process proceeds to step SS85.

  In step SS85, the CPU 80a assigns a page number Pn corresponding to each page of the electronic file to the pen position data strings D1 and D2 generated in step SS80, in other words, the first stroke data and the second stroke data. To do. In addition, the procedure of this step SS85 functions as a page providing means described in each claim.

  Subsequent Step SS90, Step SS100, and Step SS110 are the same as those in FIG. If the first calculated writing direction and the second calculated writing direction are calculated in step SS110, the process proceeds to step SS113.

  In Step SS113, the CPU 80a determines whether the writing direction WD related to the calculated writing direction calculated in Step SS110 is a direction along the first direction 4. If the writing direction WD related to the calculated writing direction is the direction along the first direction 4, the determination at Step SS113 is satisfied, and the routine goes to Step SS114.

  In step SS114, the CPU 80a determines whether or not the writing direction WD related to the calculated writing direction calculated in the current step SS110 is opposite to the writing direction WD related to the calculated writing direction calculated in the previous step SS110. Determine whether. This substantially corresponds to determining whether or not the writing direction related to the first direction 4 calculated in step SS110 has changed. When the writing direction WD related to the current calculated writing direction is the same direction as the writing direction WD related to the previous calculated writing direction, it is considered that the writing surface 31, that is, the page is not shifted, and step SS 114. Is not satisfied, the process returns to step SS70 and the same procedure is repeated. On the other hand, if the writing direction WD related to the current calculated writing direction is opposite to the writing direction WD related to the previous calculated writing direction, it is considered that the page has been shifted, and the determination in step SS114 is satisfied. Then, the process proceeds to Step SS117 described later.

  On the other hand, when the writing direction WD related to the calculated writing direction is not the direction along the first direction 4 in step SS113, the determination in step SS113 is not satisfied, and the process proceeds to step SS115.

  In step SS115, the CPU 80a determines whether or not the line traveling direction LD related to the calculated writing direction calculated in step SS110 is a direction along the first direction 4. If the line advancing direction LD related to the calculated writing direction is not the direction along the first direction 4, the determination at step SS115 is not satisfied, and the routine goes to step SS250 in FIG. On the other hand, when the line advancing direction LD related to the calculated writing direction is the direction along the first direction 4, the determination at Step SS115 is satisfied, and the routine goes to Step SS116.

  In step SS116, the CPU 80a determines whether or not the line progress direction LD related to the calculated writing direction calculated in the current step SS110 is opposite to the line progress direction LD related to the calculated writing direction calculated in the previous step SS110. Determine whether. This substantially corresponds to determining whether or not the writing direction related to the first direction 4 calculated in step SS110 has changed. If the line progression direction LD related to the current calculated writing direction is the same direction as the line progression direction LD related to the previous calculated writing direction, it is considered that page transition has not been performed, and the determination in step SS116 is satisfied. If not, the process returns to step SS70 and the same procedure is repeated. On the other hand, if the line progress direction LD related to the current calculated writing direction is opposite to the line progress direction LD related to the previous calculated writing direction, it is considered that the page has been shifted, and the determination in step SS116 is satisfied. Then, the process proceeds to step SS117.

  In step SS117, the CPU 80a adds 1 to the page number Pn. This substantially corresponds to control so as to switch the page number assigned in step SS85. As a result, the pen position data string D generated thereafter is recorded on the next page in the electronic file. Thereafter, the process proceeds to step SS118 shown in FIG. The procedure of step SS117 corresponds to page switching means described in each claim.

  As shown in FIG. 22, in step SS118, the CPU 80a is generated in step SS80 and stored in the RAM 80c by the above-described method before it is determined that the writing direction is changed in step SS114 or SS116. For the pen position data strings D1 and D2, that is, the pen position data strings D1 and D2 before the writing direction is changed, the first calculated writing direction corresponding to the first stroke data based on the first pen position data string D1 is set. While calculating, the 2nd calculation writing direction corresponding to the 2nd stroke data based on the said 2nd pen position data sequence D2 is calculated.

  Then, the process proceeds to step SS124, and the CPU 80a determines whether or not the writing direction WD related to the first calculated writing direction and the second calculated writing direction calculated in step SS118 is a direction along the first direction 4. judge. If the writing direction WD related to the first calculated writing direction and the second calculated writing direction is a direction along the first direction 4, the determination in step SS124 is satisfied, and the process proceeds to step SS134.

  In step SS134, the CPU 80a determines the writing direction WD related to the first calculated writing direction and the writing direction WD related to the second calculated writing direction calculated in step SS118. That is, in step SS134, the first calculated writing direction and the second calculated writing direction related to the first direction 4 out of the first calculated writing direction and the second calculated writing direction calculated in step SS118. Each direction WD is determined. Thereafter, the process proceeds to Step SS154 described later.

  On the other hand, in step SS124, when the writing direction WD related to the first calculated writing direction and the second calculated writing direction is not the direction along the first direction 4, that is, in the first calculated writing direction and the second calculated writing direction. If the writing direction WD concerned is a direction along the second direction 5, the determination at step SS124 is not satisfied, and the routine goes to step SS144.

  In step SS144, the CPU 80a determines the line progression direction LD related to the first calculated writing direction and the line progression direction LD related to the second calculated writing direction, respectively, calculated in step SS118. That is, in this step SS144, among the first calculated writing direction and the second calculated writing direction calculated in step SS118, the line progress is the first calculated writing direction and the second calculated writing direction related to the first direction 4. Each direction LD is discriminated.

  Then, the process proceeds to Step SS154, and the CPU 80a, among the first calculated writing directions calculated in Step SS118, the first calculated writing direction related to the first direction 4 and the set writing direction set in Step SS20 described above. Are in agreement with each other. If the first calculated writing direction related to the first direction 4 matches the set writing direction, the determination at step SS154 is satisfied, and the routine goes to step SS164.

  In step SS164, the CPU 80a recognizes the left writing surface 31L on the left sheet portion 10L side as the above-described active page. Thereafter, the process proceeds to Step SS194 described later.

  On the other hand, if the first calculated writing direction and the set writing direction related to the first direction 4 do not match in step SS154, the determination in step SS154 is not satisfied, and the process proceeds to step SS174.

  In step SS174, the CPU 80a determines that the second calculated writing direction related to the first direction 4 among the second calculated writing directions calculated in step SS118 and the set writing direction set in step SS20 described above are: It is determined whether or not they match. If the second calculated writing direction related to the first direction 4 matches the set writing direction, the determination at Step SS174 is satisfied, and the routine goes to Step SS184.

  In step SS184, the CPU 80a recognizes the right writing surface 31R on the right sheet portion 10R side as the above-described active page.

  After that, in step SS194, the CPU 80a applies the sense coil on the non-active page side that has not been recognized as the active page in step SS164 or step SS184 among the pen position data strings D1 and D2 stored in the RAM 80c at this time. The corresponding pen position data string D is cleared. Specifically, when it is determined in step SS154 that the first calculated writing direction related to the first direction 4 matches the set writing direction, and the left writing surface 31L is recognized as an active page, the CPU 80a is opposite. The second pen position data string D2 corresponding to the right sense coils RX1 to RXm and RY1 to RYn on the right writing surface 31R side is cleared. On the other hand, when it is determined in step SS174 that the second calculated writing direction related to the first direction 4 matches the set writing direction and the right writing surface 31R is recognized as an active page, the CPU 80a determines that the left side on the opposite side The first pen position data string D1 corresponding to the left-side sense coils LX1 to LXm and LY1 to LYn on the writing surface 31L side is cleared. The procedure of step SS194 functions as data erasing means described in each claim.

  Then, the process proceeds to step SS244, and the CPU 80a stores the pen position data string D generated at this time and stored in the RAM 80c, that is, before the writing direction is determined to have changed in step SS114 or step SS116. The stored pen position data string D is stored in the flash memory 72. Specifically, when it is determined in step SS154 that the first calculated writing direction related to the first direction 4 matches the set writing direction and the left writing surface 31L is recognized as an active page, the CPU 80a The first pen position data string D1 corresponding to the first calculated writing direction, that is, corresponding to the left sense coils LX1 to LXm and LY1 to LYn on the left writing surface 31L side is stored in the flash memory 72. On the other hand, if it is determined in step SS174 that the second calculated writing direction related to the first direction 4 matches the set writing direction, and the right writing surface 31R is recognized as an active page, the CPU 80a performs the second calculation. The second pen position data string D2 corresponding to the writing direction, that is, corresponding to the right sense coils RX1 to RXm and RY1 to RYn on the right writing surface 31R side is stored in the flash memory 72. And it returns to step SS30 shown in the said FIG. 20, and repeats the same procedure. The procedure of step SS244 functions as data storage means described in each claim.

  On the other hand, when the second calculated writing direction in the first direction 4 matches the set writing direction in step SS174, the determination in step SS174 is not satisfied, and the process proceeds to step SS250 shown in FIG.

  Step SS250, step SS260, step SS270, step SS280, step SS290, step SS300, and step SS310 are the same as those in FIG. In step SS310, the pen position data strings D1 and D2 are generated using the coordinate data (x, y) calculated in step SS300 described above, and temporarily stored in the RAM 80c. Then, the process proceeds to step SS334.

  In step SS334, the CPU 80a stores the pen position data strings D1 and D2 generated at this time and stored in the RAM 80c in the flash memory 72. Then, it returns to step SS30 shown in the said FIG. 20, and repeats the same procedure.

  In the above, the procedures of Step SS30 and Step SS70 in FIG. 20, Step SS64 in FIG. 21, and Step SS300 in FIG. 23 function as position acquisition means described in each claim. Further, the procedure of Step SS80 in FIG. 20, Step SS66 in FIG. 21, and Step SS310 in FIG. 23 functions as a stroke data generation unit. Furthermore, the procedure of step SS110 of FIG. 20 and step SS118 of FIG. 22 functions as a writing direction calculation unit. Furthermore, the procedure of step SS154 and step SS174 of FIG. 22 functions as a writing direction determination unit. And the procedure of step SS114 of FIG. 20 and step SS116 functions as a writing change determination means.

  Here, when the user writes a character string on the writing surface 31 of the notebook 30, for example, the character string is described on the page of the left writing surface 31L, and the page is filled with the character string, and the description portion When there is no more, it is normal to write a new character string on the page of the right writing surface 31R. Accordingly, the pen position data sequence D (stroke data) that is sequentially generated and stored in the flash memory 72 is also convenient for the user if the pen position data sequence D (stroke data) can be organized for each page, as in the above note 30.

  In this modification, a page number Pn is assigned to the pen position data string D in correspondence with the above. Here, when an actual writing moves from one page to the next page while the user is using the flipped state, the writing direction related to the first direction 4 of the pen position data string D is the time after the page. Switch in the opposite direction. Therefore, in this modification, it is determined in step SS114 and step SS116 in FIG. 20 whether or not the calculated writing direction related to the first direction 4 has changed corresponding to such behavior. When it is determined that the writing direction related to the first direction 4 has changed, it is considered that the page transition in the actual writing as described above has been performed, and the page number Pn assigned to the pen position data string D is switched.

  As described above, in this modification, the page number assigned to the pen position data string D can be automatically switched using the change behavior of the pen position data string D accompanying the writing operation.

  In particular, when the page number switching control is performed in step SS117 in FIG. 20, the writing direction is calculated for the pen position data string D (stroke data) before the writing direction is changed (FIG. 20). 22 step SS118). Thereafter, it is determined whether or not the calculated writing direction of the pen position data sequence D before the writing direction is changed matches the set writing direction. When it is determined that the calculated writing direction matches the set writing direction, the pen position data string D corresponding to the calculated writing direction and before the writing direction is changed is stored in the flash memory 72. Thereby, every time the page number assigned to the pen position data string D is switched, that is, every time a so-called page break operation is performed, correct stroke data can be generated and stored. As a result, unlike the case where stroke data for all pages is processed at once, the writing direction is different between one page and the next page, that is, when pages with different writing directions are mixed in the notebook 30. Even so, the stroke data can be processed in the correct orientation for each page.

(C) Others In the above, the character data included in the stroke data based on the pen position data string D is cut out, and the center coordinates of the character data cut out first and the center coordinates of the character data cut out next. And the writing direction of the electronic pen 2 was calculated, but is not limited thereto. That is, immediately before the character data (character data corresponding to the first character in the second line) whose x-coordinate or y-coordinate has greatly changed from the center coordinate of the character data that was cut out first The writing direction of the electronic pen 2 may be calculated by comparing the center coordinates of the character data (character data corresponding to the last character in the first line). In this case, the same effect is obtained.

  In the above description, the coordinate detection device 3 records the pen position data sequence D generated based on the calculated coordinate data of the electronic pen 2 on each page in the electronic file. However, the present invention is not limited to this. That is, the electronic file may not be generated, and only the page number may be assigned and assigned to the pen position data string D and stored in the flash memory 72. In this case, the generation of the electronic file may be performed by an appropriate external device connected to the coordinate detection device 3.

  Further, in the above, the electronic pen 2 includes the battery 43 as a self-power source, and the magnetic fields generated by the LC oscillation circuit 41 by the electromotive force of the battery 43 are detected as the sense coils LX1 to LXm, LY1 to LYn, RX1 to RXm, RY1. Although it was received by RYn and the coordinate data of the electronic pen 2 was calculated, it is not limited to this. That is, the self-power supply is not provided on the electronic pen side, the electromotive force is induced in the resonance circuit of the electronic pen by magnetic induction from the coil on the device side, and the electric charge is accumulated in the capacitor of the electronic pen. The magnetic field generated by the electronic pen may be received by a coil on the apparatus side, and coordinate data calculation, that is, position detection may be performed. In this case, the same effect is obtained.

  In addition, in the above, the arrow shown in FIG. 3 shows an example of the signal flow, and does not limit the signal flow direction.

  Further, the flowcharts shown in FIG. 11, FIG. 12, FIG. 13 and the like do not limit the present invention to the procedure shown in the above-mentioned flow, and the addition / deletion or order of the procedures within the scope of the gist and technical idea of the invention. May be changed.

  In addition to those already described above, the methods according to the above-described embodiments and modifications may be used in appropriate combination.

  In addition, although not illustrated one by one, the present invention is implemented with various modifications within a range not departing from the gist thereof.

1 Handwriting input device (electronic writing device)
2 Electronic pen (electronic writing instrument)
DESCRIPTION OF SYMBOLS 3 Coordinate detection apparatus 4 1st direction 5 2nd direction 10 Sheet | seat body 10L Left side sheet | seat part 10M Bending part 10R Right side sheet | seat part 30 Notes (writing body)
31L Left writing surface 31R Right writing surface LX1 to LXm, LY1 to LYn Left sense coil (first coil, coil)
LD Row traveling direction RX1 to RXm, RY1 to RYn Right side sense coil (second coil, coil)
T Folding center line WD Writing direction

Claims (7)

It is configured in a shape that can be spread in a predetermined first direction so as to cover a substantially notebook-shaped writing body, and is located in the center of the first direction and along a second direction orthogonal to the first direction. A sheet body provided with a folding portion having a folding center line;
An electronic writing instrument that generates and transmits a writing signal for position detection for performing data input corresponding to writing contents to the writing body;
A writing direction setting means for performing a setting input related to a writing direction by the electronic writing instrument;
A plurality of coils capable of receiving the writing signal transmitted from the electronic writing instrument;
Position acquisition means for acquiring position information of the electronic writing instrument based on a reception result of the writing signal equal to or greater than a predetermined value in the plurality of coils;
Using the position information acquired by the position acquisition means, stroke data generation means for generating stroke data corresponding to the description on the writing object by the electronic writing instrument;
A writing direction calculating means for calculating a writing direction by the electronic writing instrument based on a time-series change of the stroke data generated by the stroke data generating means;
A writing direction determining means for determining whether or not the calculated writing direction calculated by the writing direction calculating means and the set writing direction set by the writing direction setting means match;
An electronic device comprising: a data storage unit that accumulates stroke data corresponding to the calculated writing direction when the writing direction determining unit determines that the calculated writing direction matches the set writing direction. Writing device. The sheet body is
A first sheet portion provided on one side of the bent portion along the first direction;
A second sheet portion provided on the other side of the bent portion along the first direction;
With
The plurality of coils are:
A first coil provided in the first sheet portion;
A second coil provided on the second sheet portion,
The position acquisition means includes
Based on the reception result of the writing signal in the first coil and the second coil, respectively, to acquire the position information of the electronic writing instrument,
The stroke data generating means includes
The first stroke data and the second coil corresponding to the first coil using the position information acquired by the position acquisition unit based on the reception of the writing signal by the first coil and the second coil, respectively. 2nd stroke data corresponding to
The writing direction calculating means includes:
Calculating a first calculated writing direction and a second calculated writing direction respectively corresponding to the first stroke data and the second stroke data generated by the stroke data generating means;
The writing direction determination means includes
Determining whether or not the first calculated writing direction and the second calculated writing direction calculated by the writing direction calculating means match the set writing direction set by the writing direction setting means;
The data storage means is
When the writing direction determining means determines that the first calculated writing direction matches the set writing direction, the first stroke data is accumulated, and the writing direction determining means determines that the second calculated writing direction is the set writing direction. If it is determined that the direction matches, the second stroke data is accumulated,
And,
When the writing direction determination means determines that the first calculated writing direction matches the set writing direction, the second stroke data is erased and the second calculated writing direction is determined by the writing direction determination means. 2. The electronic writing apparatus according to claim 1, further comprising a data erasing means for erasing the first stroke data when it is determined that the direction coincides with the set writing direction. The sheet body is
A first sheet portion provided on one side of the bent portion along the first direction;
A second sheet portion provided on the other side of the bent portion along the first direction;
With
The plurality of coils are:
A first coil provided in the first sheet portion;
A second coil provided on the second sheet portion,
The position acquisition means includes
The position information of the electronic writing instrument is acquired based on the reception result of the writing signal in the first coil, or the position information of the electronic writing instrument is acquired based on the reception result of the writing signal in the second coil. Acquired,
The stroke data generating means includes
Generating the first stroke data corresponding to the first coil using the position information acquired by the position acquisition means based on the reception of the writing signal by the first coil, or the second coil; Generating the second stroke data corresponding to the second coil, using the position information acquired by the position acquisition means based on the reception of the writing signal at
The writing direction calculating means includes:
A first calculated writing direction corresponding to the first stroke data generated by the stroke data generating means is calculated, or a second calculated writing corresponding to the second stroke data generated by the stroke data generating means Calculate the direction,
The writing direction determination means includes
It is determined whether or not the first calculated writing direction calculated by the writing direction calculating means matches the set writing direction set by the writing direction setting means, or by the writing direction calculating means Determining whether the calculated second calculated writing direction and the set writing direction set by the writing direction setting means match;
And,
When the writing direction determination means determines that the first calculated writing direction does not coincide with the set writing direction, the first calculation related to the first direction among the first calculated writing directions is used as the first stroke data. In addition to performing mirror image conversion processing that reverses along the writing direction, and when the writing direction determination means determines that the second calculated writing direction does not match the set writing direction, the second calculation is performed on the second stroke data. A conversion means is provided for performing mirror image conversion processing that is reversed along the second calculated writing direction related to the first direction in the writing direction,
The data storage means is
When the writing direction determination means determines that the first calculated writing direction matches the set writing direction, the first stroke data is accumulated, and the second calculated writing direction is set by the writing direction determination means. If it is determined that the writing direction matches, the second stroke data is accumulated,
When the writing direction determination means determines that the first calculated writing direction does not match the set writing direction, the writing direction determination means stores the first stroke data after mirror image conversion processing by the conversion means. 2. The electronic writing according to claim 1, wherein when the second calculated writing direction is determined not to match the set writing direction, the second stroke data after mirror image conversion processing by the converting unit is accumulated. apparatus. The writing direction determination means includes
3. It is determined whether or not the calculated writing direction related to the first direction and the set writing direction match among the calculated writing directions calculated by the writing direction calculation unit. Or the electronic writing apparatus of Claim 3. Page giving means for giving a page number to the stroke data generated by the stroke data generating means;
A writing change determining means for determining whether or not the writing direction related to the first direction is calculated by the writing direction calculating means;
A page switching means for controlling the page giving means to switch the assigned page number when the writing change judging means determines that the writing direction related to the first direction has changed;
The electronic writing apparatus according to claim 4, further comprising: When the page switching control is performed by the page switching unit, the writing direction calculation unit calculates the writing direction for the stroke data before the writing direction is changed,
The writing direction determination means includes
It is determined whether the calculated writing direction of the stroke data before the change of the writing direction and the set writing direction set by the writing direction setting unit calculated by the writing direction calculation unit match. And
The data storage means is
When it is determined by the writing direction determination means that the calculated writing direction and the set writing direction match, stroke data corresponding to the calculated writing direction until the writing direction is changed is accumulated. The electronic writing apparatus according to claim 5. Character recognition means for recognizing the stroke data generated by the stroke data generation means for each character data included in the stroke data;
The writing direction calculating means includes:
The electronic writing apparatus according to claim 1, wherein a writing direction by the electronic writing instrument is calculated based on an additional behavior of the character data recognized by the character recognition unit.

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