Position detection device, page detection method, and sheet-like recording medium

Abstract

[Problem] To enable detection of page information of a certain page during writing without providing a projecting part for page detection, without using an optical or magnetic detection means or a sensor that reads a code such as a two-dimensional code, and without user operation. [Solution] A position detection device 10 according to the present invention detects a position indicated by a stylus Sa configured to be usable for visible handwriting on a notepad P1 placed on a touch surface 10a. The position detection device 10 comprises a sensor that senses a page identification member for identifying each page constituting a plurality of pages placed on the notepad P1, and a control circuit connected to the sensor. The page identification member is configured by a conductor, and the sensor is configured to detect the conductor using a capacitive sensing method. The control circuit is configured to be capable of identifying the page being handwritten with the stylus Sa in response to the detection of the conductor by the sensor.

Description

[Technical field]

[0001] The present invention relates to a position detection device, a page detection method, and a sheet-like recording medium. [Background technology]

[0002] There is known a handwritten data drawing device that allows the handwriting of a user writing characters or pictures on a sheet-like recording medium such as a report paper to be electronically captured as handwritten data. This type of device generally includes a position detection device such as a digitizer and a stylus having both a function as an indicator and a function as a ballpoint pen. The sheet-like recording medium is placed on the touch surface of the position detection device. With this configuration, when a user writes characters or pictures on the surface of the sheet-like recording medium using the ballpoint pen function of the stylus, the position detection device can obtain a series of coordinate data indicating the movement trajectory of the stylus on the touch surface. The series of coordinate data obtained in this manner becomes handwritten data indicating the handwriting of the electronic pen.

[0003] Incidentally, the sheet-like recording medium used in the handwritten data drawing device may have multiple pages, such as a bound notebook. In this case, the handwritten data drawing device needs to create handwritten data for each page separately. Otherwise, the handwriting written on each of the multiple pages of the sheet-like recording medium will overlap on one page on the screen. In this regard, Patent Document 1 discloses a technology in which a position detection device is provided with an operation button for switching the file in which the coordinate data is stored to a new file, thereby creating a file of handwritten data for each page. Patent Document 2 discloses a technology in which a barcode indicating the document name and page number is printed on each page of the sheet-like recording medium in advance, and the barcode is read by a code reader to identify the page on which the user is writing. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 6005880 [Patent Document 2] JP 2001-147771 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, with the technology of Patent Document 1, if the user forgets to press the operation button, the handwriting written on each of the multiple pages of the sheet-type recording medium will be displayed overlapping on one page on the screen. Also, with the technology of Patent Document 2, a protruding part for the code reader is created on the surface on which the sheet-type recording medium is placed, which is not aesthetically pleasing in terms of design.

[0006] It is conceivable that a user could identify the page on which he or she is writing by optically detecting holes provided on each page of a sheet-like recording medium, but if light is emitted from a dedicated light source and the intensity of the reflected light is measured, a complex structure would be required for transmitting and receiving light. It is conceivable to use external light such as indoor lighting or sunlight instead of a dedicated light source, but the detection accuracy would depend on the intensity of the external light.

[0007] It is also possible to write a code such as a two-dimensional code on the surface of each page, and have a sensor read this code to identify the page the user is writing on. However, with this method, the sensor that reads the code must be positioned so that it covers the surface of the page, which could get in the way of turning the pages.

[0008] Furthermore, a method of magnetically identifying the turning of a page by disposing a magnetic material on each page is also conceivable, but taking into consideration the spread of the magnetic field, the number of pages that can be stacked is greatly limited.

[0009] Therefore, one object of the present invention is to provide a position detection device, a printer, and a page detection method that can identify the page being written on while avoiding the above-mentioned problems. [Means for solving the problem]

[0010] The position detection device described in this embodiment is a position detection device that has a mounting surface on which a sheet-like recording medium is placed, the pages of which are configured to be superimposed on each other, and detects a position indicated by a stylus in response to a handwriting operation on the sheet-like recording medium placed on the mounting surface using a stylus configured to be able to visibly write on the sheet-like recording medium placed on the mounting surface, the position detection device having a sensor that senses a page identification member for identifying each of the multiple pages that make up the sheet-like recording medium placed on the mounting surface, and a control circuit connected to the sensor, the page identification member being made of a conductor and the sensor being configured to detect the conductor using a capacitance method, and the control circuit being configured to be able to identify the target page of the handwriting operation using the stylus in response to the detection of the conductor placed on the sheet-like recording medium by the sensor.

[0011] The page detection method described in this embodiment is a page detection method for detecting a page corresponding to a handwriting operation on a sheet-like recording medium placed on a supporting surface on which a sheet-like recording medium configured so that multiple pages are overlapped on each other is placed, using a stylus that can visibly write handwriting on the sheet-like recording medium placed on the supporting surface, characterized in that, in response to the stylus being separated from the sheet-like recording medium placed on the supporting surface, a page identification member made of a conductor for identifying each of the multiple pages arranged on the sheet-like recording medium placed on the supporting surface is sensed by a capacitive method, and the page that is the target of the handwriting operation by the stylus is identified in response to the detection of the conductor arranged on the sheet-like recording medium by the sensor.

[0012] The sheet-like recording medium described in this embodiment is a sheet-like recording medium configured so that multiple pages are superimposed on each other, and is used together with a page-turning state detection device equipped with a loading surface on which the sheet-like recording medium is placed and an electrostatic sensor for recognizing each page of the sheet-like recording medium, and is characterized in that a page identification member is arranged to identify each page that constitutes the multiple pages, and the page identification member is made of a conductor, so that the page corresponding to the page turning of the sheet-like recording medium configured so that multiple pages are superimposed on each other can be recognized based on the detection state of the conductor by the electrostatic sensor. Effect of the Invention

[0013] According to the present invention, it is possible to detect page information of a page being written without providing a protruding part for page detection, without using optical or magnetic detection means or sensors that read codes such as two-dimensional codes, and without user operation. [Brief description of the drawings]

[0014] [Figure 1] FIG. 1 is a diagram showing a position detection device 10 and a tablet terminal 30 according to a first embodiment of the present invention. [Diagram 2] (a) is a diagram showing an example of identification information written in advance on each page of a five-page notepad P1, and (b) is a diagram showing a heat map generated by the position detection device 10 when a user is writing on each page of (a). [Diagram 3] FIG. 3(a) shows another example of identification information written in advance on each page of a five-page notepad P1, and FIG. 3(b) shows a heat map generated by the position detection device 10 when a user is writing on each page of FIG. 3(a). [Figure 4] 2 is a diagram showing the internal configuration of the position detection device 10 and the tablet terminal 30. FIG. [Diagram 5] FIG. 2 is a diagram showing a detailed configuration of a sensor 15. [Figure 6] 2A to 2C are diagrams showing handwritten data output from a sensor controller 16, a file for storing the handwritten data, and stroke data stored in a memory 35 by a stroke builder 33. FIG. [Figure 7] 13 is a diagram showing the principle of heat map generation by the sensor controller 16. FIG. [Figure 8] FIG. 2 is a flowchart of a process performed by a sensor controller 16 according to the first embodiment of the present invention. [Figure 9] FIG. 11 is a diagram showing the internal configuration of a position detection device 10 and a tablet terminal 30 according to a second embodiment of the present invention. [Figure 10] FIG. 2 is a diagram showing detailed configurations of sensors 20 and 21 and a stylus Sb. [Figure 11] FIG. 11 is a flowchart of a process performed by a sensor controller 16 according to a second embodiment of the present invention. [Figure 12] FIG. 11 is a diagram showing the internal configuration of a position detection device 10 and a tablet terminal 30 according to a third embodiment of the present invention. [Figure 13] 13A and 13B are diagrams showing a sheet-shaped recording medium P2 according to a third embodiment of the present invention and a method for writing identification information onto the sheet-shaped recording medium P2. [Figure 14] 2 is a schematic block diagram showing the functional blocks of the printer 60. FIG. [Figure 15] FIG. 11 is a flowchart of a process performed by a sensor controller 16 according to a third embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

[0016] FIG. 1 is a diagram showing a position detection device 10 and a tablet terminal 30 according to a first embodiment of the present invention. The position detection device 10 is a device that has a built-in projected capacitive sensor (PCAP, electrostatic sensor) and detects the position of a stylus Sa on a touch surface 10a shown in the figure by using this sensor. The stylus Sa supports an active electrostatic system. It functions as an indicator for indicating a position on the touch surface 10a, and also functions as a writing implement (e.g., a ballpoint pen) for leaving a visible trace of handwriting on the surface of a sheet-like recording medium. The tablet terminal 30 is a computer having a touch screen 31 that supports touch input. The position detection device 10 and the tablet terminal 30 are connected to each other by wireless communication such as Bluetooth (registered trademark) or wired communication such as USB.

[0017] The X direction and the Y direction shown in FIG. 1 correspond to the horizontal direction and the depth direction, respectively, as seen by the user of the position detection device 10. The position detection device 10 has a rectangular shape with one side in the Y direction longer than the other side in the X direction, and is used in a state in which a rectangular notepad P1 slightly smaller than the position detection device 10 is mounted on the touch surface 10a as shown in FIG. 1. That is, the touch surface 10a of the position detection device 10 is configured to function as a mounting surface on which a sheet-like recording medium configured so that multiple pages are superimposed on each other is placed. As will be described in detail later, when a user writes characters or draws pictures on the surface of the notepad P1 using a stylus Sa as a writing implement, the position detection device 10 detects the trajectory of the stylus Sa as a series of coordinate data. The tablet terminal 30 acquires this series of coordinate data from the position detection device 10, generates stroke data, and displays it on the touch screen 31. FIG. 1 shows a state in which the character string "MAKING IDEAS" written by the user on the notepad P1 is displayed on the touch screen 31 of the tablet terminal 30 through these processes.

[0018] 1, the position detection device 10 is configured to include a power button 11, a power lamp 12, a recording medium fixing portion 13, and a stylus holding portion 14. Of these, the power button 11 is a switch for turning on and off the power of the position detection device 10. The power lamp 12 is a lamp that lights up when the power of the position detection device 10 is on and goes out when the power is off.

[0019] The recording medium fixing portion 13 is an opening configured to allow insertion of the backing of a notepad P1, which is an example of a sheet-like recording medium. A user fixes the notepad P1 to the position detection device 10 by inserting the backing of the notepad P1 into the recording medium fixing portion 13. The stylus holding portion 14 is a recess for fixing the stylus Sa. When the stylus Sa is not in use, the user fixes the stylus Sa to the position detection device 10 by fitting the end of the stylus Sa into the recess of the stylus holding portion 14 with the clip of the stylus Sa inserted into the recording medium fixing portion 13.

[0020] The position detection device 10 is configured to accumulate a series of coordinate data detected sequentially in one file as a basic operation. Therefore, if a user writes on multiple pages while flipping through the notepad P1, one file will contain coordinate data of handwriting on different pages. If the series of coordinate data accumulated in this way is displayed on the touch screen 31 of the tablet terminal 30, the handwriting on multiple pages will be displayed overlapping each other.

[0021] Since this is not practical, the position detection device 10 is configured to associate page switching with coordinate data, for example, by identifying the page on which the user is writing and changing the file that stores the coordinate data each time the page changes. Detection of page information of a page on which writing is being performed is realized by writing different identification information (page identification member) on each page of the notepad P1 in advance and having the position detection device 10 read this identification information through electrical interaction. This makes it possible for the position detection device 10 to detect page information of a page on which writing is being performed without providing a protruding portion for page detection and without user operation. Therefore, it becomes possible to create a file containing a series of coordinate data for each page, which prevents handwriting on multiple pages from being displayed overlapping on the touch screen 31.

[0022] FIG. 2(a) is a diagram showing an example of identification information written in advance on each page of a five-page notepad P1. The identification information in this example is composed of a conductive mark M that makes the pages distinguishable from each other. The conductive mark M is formed by disposing (printing) a conductive material on each page during the manufacturing stage of the notepad P1, and since it is printed in a different manner for each page, it functions as identification information for each page. Note that the conductive material used to print the conductive mark M is preferably a transparent material such as ITO (Indium Tin Oxide), but the conductive mark M may be composed of an opaque conductive material. The position detection device 10 reads (senses) the conductive mark M based on the same principle as finger detection using a capacitive method. For example, a heat map showing the positions of conductors in the touch surface 10a is generated, and the conductive mark M is extracted from the heat map.

[0023] 2(a) in detail, the conductive mark M printed on the first page, which is the top page, is composed of five oblique lines aligned along the long side on the left side of the notepad P1 as seen by the user. The conductive mark M printed on the second page is composed of four oblique lines obtained by removing the bottom line (on the user side) from the conductive mark M on the first page. Similarly, the conductive mark M printed on the nth page (n≧2) is composed of 6-n oblique lines obtained by removing the bottom line from the conductive mark M on the n-1th page.

[0024] FIG. 2(b) is a diagram showing a heat map generated by the position detection device 10 when the user is writing on each page of FIG. 2(a). As shown in the figure, when the user is writing on, for example, the first page, the conductor detected by the position detection device 10 has a shape of five diagonal lines aligned along the left edge of the touch surface 10a. When the user is writing on the second page, the conductor detected by the position detection device 10 has a shape of four diagonal lines aligned along the left edge of the touch surface 10a. Similarly, when the user is writing on the nth page (n≧2), the conductor detected by the position detection device 10 has a shape of 6-n diagonal lines aligned along the left edge of the touch surface 10a. By arranging the conductors of each page in this way, for example, it is possible to make the detection results of the position detection device 10 different for each page. Therefore, it is possible to identify the page on which the user is writing.

[0025] The position detection device 10 previously stores information indicating the position and shape of the conductive mark M printed on each page of the notepad P1, and a correspondence table that associates the contents of the detected conductive mark M (e.g., the number of diagonal lines) with the page being written on. The position detection device 10 that generates the heat map shown in FIG. 2(b) first extracts the conductive mark M included in the generated heat map by performing geometric shape matching based on the previously stored information indicating the position and shape of the conductive mark M. Next, the position detection device 10 detects page information of the page being written on by referring to the correspondence table based on the extracted conductive mark M. In this way, the position detection device 10 also functions as a page turning state detection device.

[0026] Table 1 is a diagram showing an example of a correspondence table stored in the position detection device 10. This table shows an example in which the conductive mark M shown in FIG. 2(a) is used. As shown in Table 1, the correspondence table in this example is configured to store the number of diagonal lines constituting the conductive mark M in association with page information of the page being written. Therefore, the position detection device 10 can detect the page information of the page being written from the number of diagonal lines included in the conductive mark M extracted from the heat map.

[0027] [Table 1]

[0028] Here, FIG. 3(a) is a diagram showing another example of identification information written in advance on each page of a five-page notepad P1, and FIG. 3(b) is a diagram showing a heat map generated by the position detection device 10 when a user is writing on each page of FIG. 3(a). In this example, the conductive mark M on each page is composed of only one oblique line, but its position differs depending on the page, and as a result, a heat map similar to that of FIG. 2(b) is obtained. Therefore, the position detection device 10 can detect page information of a page being written on by a process similar to that in the case of using the conductive mark M in FIG. 2(a). In this way, the specific form of the conductive mark M is not limited to one. In short, it is sufficient that a plurality of conductors arranged on a sheet-shaped recording medium consisting of a plurality of pages are configured to be capacitively detected by the position detection device 10, and that the plurality of conductors are arranged on the sheet-shaped recording medium so that the writing page can be identified.

[0029] 4 is a diagram showing the internal configurations of the position detection device 10 and the tablet terminal 30. As shown in the figure, the position detection device 10 further includes a sensor 15, a sensor controller 16, a memory 17, and a wireless communication unit 18. The tablet terminal 30 includes a touch screen 31 also shown in FIG. 1, as well as a wireless communication unit 32, a stroke builder 33, an editor 34, and a memory 35.

[0030] The sensor 15 is a projected capacitive sensor (PCAP) that detects the position of the stylus Sa by an active electrostatic method and detects the position of a conductor by a capacitive method. The sensor 15 is disposed on the back side of the sheet-like recording medium placed on the placement surface of the position detection device 10, and senses the conductive mark M as a page identification member.

[0031] 5 is a diagram showing a detailed configuration of the sensor 15. As shown in the figure, the sensor 15 is configured to have a plurality of linear electrodes 15x, 15y arranged to cover the entire touch surface 10a. The plurality of linear electrodes 15x are linear electrodes extending in the Y direction and arranged at equal intervals in the X direction perpendicular to the Y direction. The plurality of linear electrodes 15y are linear electrodes extending in the X direction and arranged at equal intervals in the Y direction. Each of the plurality of linear electrodes 15x, 15y is connected to the sensor controller 16.

[0032] Returning to FIG. 4, the sensor controller 16 is a control circuit that detects the position of the stylus Sa using the sensor 15 and also receives data transmitted by the stylus Sa, and is configured by an integrated circuit. The position detection of the stylus Sa is performed by an active electrostatic method. The sensor controller 16 also generates the above-mentioned heat map by detecting the position of a conductor in the touch surface 10a using the sensor 15, and detects page information of the page on which the user is writing based on the result.

[0033] In this example, the memory 17 is a storage device configured to manage data on a file-by-file basis. The sensor controller 16 is configured to write coordinate data indicating the position of the stylus Sa detected by the active electrostatic method and data received from the stylus Sa (hereinafter collectively referred to as "handwritten data") to a file in the memory 17. In this way, a series of handwritten data indicating the user's handwriting is accumulated in the file. The above-mentioned correspondence table is also stored in the memory 17.

[0034] 6 is a diagram showing handwritten data output from the sensor controller 16 and a file for storing the handwritten data. The sensor controller 16 in this example is configured to generate handwritten data including coordinate data (X, Y) indicating the position of the stylus Sa, a writing pressure value P and switch information SW1, SW2 (described later) received from the stylus Sa, and timestamp information indicating the time T at which the position was detected, and output the data to the memory 17. The following description will be continued assuming this example.

[0035] The sensor controller 16 is configured to generate a new file in the memory 17 when the position detection device 10 is powered on and when the page detected based on the result of reading the identification information is changed (i.e., when a page change occurs in a page during writing). In FIG. 6, the file #1 is a file generated in response to powering on the position detection device 10, and the files #2 and #3 are files generated in response to a page change that occurs in a page during writing. When the sensor controller 16 generates a new file, it changes the output destination of the handwritten data to that file. This results in a file of handwritten data being generated for each page. Also, by associating information indicating a page with handwritten data generated in chronological order, handwritten data spanning multiple pages can be generated as one file. Furthermore, by associating and storing information indicating the time when the handwritten data was generated (timestamp information), the handwritten data can be effectively processed and edited.

[0036] Return to FIG. 4. The wireless communication unit 18 is a functional unit that retrieves a file stored in the memory 17 and transmits it to the tablet terminal 30. The wireless communication unit 18 may retrieve and transmit a file in response to a transmission instruction from the tablet terminal 30, or in response to a user's operation on an operation means provided in the position detection device 10. In addition, when the position detection device 10 and the tablet terminal 30 approach each other within a distance where communication is possible, the wireless communication unit 18 may be configured to automatically transmit the handwritten data. In addition, the wireless communication unit 18 may transmit the stored handwritten data together with information specifying the page on which the handwritten data is written, each time handwritten data for one coordinate is stored in the memory 17 by the sensor controller 16, instead of in file units. This makes it possible to display the handwritten data in real time on the touch screen 31 of the tablet terminal 30. In this case, the management of the files is performed on the tablet terminal 30 side.

[0037] Moving on to the tablet terminal 30, the wireless communication unit 32 receives the handwritten data from the position detection device 10 and supplies it to the stroke builder 33. The stroke builder 33 generates stroke data, which is vector data for drawing, based on the series of handwritten data supplied from the wireless communication unit 32, and stores it in the memory 35.

[0038] 6 also shows stroke data stored in memory 35 by stroke builder 33. As shown in the figure, stroke data is data including one or more handwritten data, and stroke builder 33 is configured to store one or more stroke data in a file in memory 35.

[0039] A method for generating stroke data by the stroke builder 33 will be described in detail. In order to generate stroke data from a series of handwritten data, it is first necessary to determine the boundaries between strokes. The stroke builder 33 determines these boundaries by referring to the pen pressure value P in each piece of handwritten data. That is, unit handwritten data whose corresponding pen pressure value P is equal to or less than a predetermined value such as zero is acquired in a hover state and does not contribute to the handwriting. Therefore, the stroke builder 33 excludes such handwritten data from the objects to be generated for stroke data, and determines the location where the excluded handwritten data is included as a boundary of a stroke. Then, one piece of stroke data is generated from a set of one or more handwritten data detected by this boundary.

[0040] When generating stroke data, the stroke builder 33 refers to the timestamp information of each piece of handwritten data to assign order information to each piece of generated stroke data. As a result, the stroke data in the file stored in the memory 35 are ordered in the order of writing. In the example of FIG. 6, the data written as "order n" (n is a natural number) is the order information, and the natural number n indicates the order of writing.

[0041] The editor 34 has the functions of retrieving files stored in the memory 35, rendering each stroke data contained therein, and displaying the results on the touch screen 31, as well as recognizing the user's touch operations on the touch screen 31 and performing processing according to the content of those operations.

[0042] Next, the detection of the stylus Sa and the generation of the heat map performed by the sensor controller 16 will be described in detail.

[0043] First, detection of the stylus Sa will be described with reference to Fig. 5. The sensor controller 16 is configured to periodically transmit an uplink signal using all of the linear electrodes 15x (or the linear electrodes 15y) shown in Fig. 5. The uplink signal is a signal that has a role of notifying the stylus Sa of the transmission timing of the downlink signal and a role of transmitting a command to the stylus Sa.

[0044] The stylus Sa that has received the uplink signal transmits a downlink signal at a timing indicated by the uplink signal. When the stylus Sa has not yet been paired with the sensor controller 16, the downlink signal is composed of an unmodulated burst signal of a predetermined time length. Hereinafter, this burst signal is referred to as a "position signal". On the other hand, when the stylus Sa is paired with the sensor controller 16, the downlink signal is composed of a position signal of a shorter time length and a data signal. The data signal is a signal modulated by data instructed by a command included in the uplink signal. Examples of data transmitted by the data signal include a writing pressure value indicating the pressure applied to the tip of the stylus Sa, switch information indicating the on / off state of a button provided on the stylus Sa, and a pen ID previously stored in the stylus Sa. The above-mentioned writing pressure value P corresponds to this writing pressure value, and the switch information SW1 and SW2 correspond to this switch information.

[0045] If the sensor controller 16 is not yet paired with the stylus Sa, after transmitting the uplink signal, it scans all of the linear electrodes 15x and 15y to try to detect the downlink signal transmitted by the stylus Sa over the entire touch surface 10a (global scan). If the downlink signal is detected by this detection process, the sensor controller 16 detects the position of the stylus Sa based on the reception strength of the downlink signal at each of the linear electrodes 15x and 15y, and performs a predetermined pairing operation with the stylus Sa. Upon completion of this operation, the sensor controller 16 and the stylus Sa are paired.

[0046] After transmitting the uplink signal, the sensor controller 16 paired with the stylus Sa scans only a predetermined number of the linear electrodes 15x and 15y in the vicinity of the last detected position of the stylus Sa, thereby attempting to detect the position signal transmitted by the stylus Sa on only a part of the touch surface 10a (local scan). Then, the sensor controller 16 acquires a new position of the stylus Sa based on the reception strength of the downlink signal at each of the linear electrodes 15x and 15y. Next, the sensor controller 16 receives the data signal transmitted by the stylus Sa by scanning only one of the linear electrodes 15x and 15y in the vicinity of the last detected position of the stylus Sa. Then, the sensor controller 16 acquires the data transmitted by the stylus Sa by demodulating the received data signal.

[0047] The sensor controller 16 also performs a process of determining the state of the stylus Sa based on the writing pressure value included in the received data signal. Specifically, if the received writing pressure value is 0, the sensor controller 16 determines that the stylus Sa is in a hover state (a state in which the pen tip is separated from the sheet-shaped recording medium). On the other hand, if the received writing pressure value is greater than 0, the sensor controller 16 determines that the stylus Sa is in a touch state (a state in which the pen tip is in contact with the touch surface 10a). The state of the stylus Sa thus determined is used to determine the timing of reading the conductive mark M made of a conductor.

[0048] Next, the generation of the heat map will be described. The generation of the heat map by the sensor controller 16 is performed based on the same principle as finger detection using a general capacitive method. This will be described in detail below with reference to FIG.

[0049] 7 is a diagram showing the principle of heat map generation by the sensor controller 16. For simplicity, only four linear electrodes 15x are shown in the figure, but in reality, more linear electrodes 15x are arranged. In the following description, it is assumed that the number of linear electrodes 15x is K.

[0050] First, the sensor controller 16 supplies the detection signal FDS shown in the figure to each linear electrode 15x. The detection signal FDS is, for example, K signals s1 to s2 each consisting of K pulses represented by "1" or "-1". K The signals s1 to s K Each nth (n=1~K) pulse is a part of pulse group p n and one pulse group p n The pulses constituting the pulse train are input in parallel to the linear electrodes 15x.

[0051] When the number of linear electrodes 15x is four, signals s1 to s K Each of the signals s1, s2, s3, and s4 is composed of four pulses represented by "1" or "-1." Specifically, as shown in Fig. 7, signal s1 is composed of "1, 1, 1, 1," signal s2 is composed of "1, 1, -1, -1," signal s3 is composed of "1, -1, -1, 1," and signal s4 is composed of "1-1, 1, -1."

[0052] The sensor controller 16 functionally includes a shift register 16a and a correlator 16b. The shift register 16a is a FIFO type storage unit and is configured to be able to store the same number of data as the number of linear electrodes 15x (i.e., K pieces). When new data is stored in the shift register 16a, data stored K times before is erased. The sensor controller 16 repeats the operation of inputting pulse groups p1 to p4 to each linear electrode 15x in a state where one linear electrode 15y is selected, for each linear electrode 15y. As a result, four levels L1 to L4 corresponding to the pulse groups p1 to p4 appear in sequence on the selected linear electrode 15y. The sensor controller 16 thus sequentially acquires the levels L1 to L4 appearing on the linear electrode 15y and stores them in the shift register 16a each time.

[0053] The specific contents of the levels L1 to L4 will be described in detail by taking as an example a case where the linear electrode 15y1 shown in FIG. 7 is selected. In the following description, the capacitances formed between the linear electrode 15y1 and each of the four linear electrodes 15x1 to 15x4 are respectively denoted by C 11 ~C 41 Let us assume that.

[0054] First, the level L1 stored in the shift register 16a corresponding to the pulse group p1 is expressed as a capacitance vector (C 11 ,C 21 ,C 31 ,C 41 ) and the vector (1,1,1,1) representing the pulse group p1. This inner product is, as shown in FIG. 11 +C 21 +C 31 +C 41 Similarly, the level L2 stored in the shift register 16a corresponding to the pulse group p2 is calculated as a capacitance vector (C 11 ,C 21 ,C 31 ,C 41 ) and the vector (1,1,-1,-1) representing the pulse group p1, 11 +C 21 -C 31 -C 41 The level L3 stored in the shift register 16a corresponding to the pulse group p3 is calculated as the capacitance vector (C 11 ,C 21 ,C 31 ,C 41 ) and the vector (1,-1,-1,1) representing the pulse group p3, 11 -C 21 -C 31 +C 41 The level L4 stored in the shift register 16a corresponding to the pulse group p4 is calculated as the capacitance vector (C 11 ,C 21 ,C 31 ,C 41 ) and the vector (1,-1,1,-1) representing the pulse group p4, 11 -C 21 +C31 -C 41 It is calculated as follows.

[0055] The sensor controller 16 uses the correlator 16b to sequentially calculate correlation values ​​T1 to T4 between the four pulse groups p1 to p4 and the levels L1 to L4 stored in the shift register 16a. The specific contents of the correlation values ​​T1 to T4 thus calculated are, as shown in FIG. 11 ,4C 21 ,4C 31 ,4C 41 That is, the correlation values ​​T1 to T4 reflect the change in capacitance formed at the intersections between the linear electrodes 15x1 to 15x4 and the linear electrode 15y1, respectively.

[0056] The sensor controller 16 calculates correlation values ​​T1 to T4 for each linear electrode 15y. Then, the calculated results are mapped on a plane to generate the above-mentioned heat map. This completes the generation of the heat map.

[0057] The above is a detailed explanation of the detection of the stylus Sa and the generation of the heat map performed by the sensor controller 16. Next, the overall flow of the processing of the sensor controller 16, including the processing of detecting page information of a page being written based on the generated heat map, will be explained in detail with reference to a flow diagram of the processing performed by the sensor controller 16.

[0058] Fig. 8 is a flow diagram of the processing performed by the sensor controller 16. This diagram shows the processing after the power button 11 shown in Fig. 1 is pressed with the notepad P1 placed on the touch surface 10a, and the position detection device 10 is powered on.

[0059] When the position detection device 10 is powered on, in this example, the sensor controller 16 first generates a heat map (step S1). The specific method of this generation is as described above. Next, the sensor controller 16 detects page information of the page on which the user is writing based on the generated heat map (step S2). The specific method of this detection is also as described above. In step S2, the sensor controller 16 also performs a process of temporarily storing information indicating the detected page in the memory 17. The sensor controller 16 also performs a process of generating a file for writing handwritten data and writing it to the memory 17 (step S3).

[0060] Next, the sensor controller 16 transmits an uplink signal (step S4), and determines whether or not pairing with the stylus Sa has been completed (step S5). If pairing has been completed, a global scan is performed (step S6), and if pairing has not been completed, a local scan is performed (step S8) and a data signal is received (step S9).

[0061] After executing step S6, the sensor controller 16 writes the coordinate data indicating the detected position to the file generated in step S3 (step S7). In this case, information other than the coordinate data and the timestamp information is null. On the other hand, after executing steps S8 and S9, the sensor controller 16 writes the detected position and the received data to the file generated in step S3 (step S10), and determines the state of the stylus Sa (hover state or touch state) based on the received pen pressure value (step S11, determination step).

[0062] After completing step S7 or step S11, the sensor controller 16 next judges whether the hover state or the no-pairing state has continued for a predetermined time (step S12). If the sensor controller 16 obtains a negative judgment result, it returns to step S4 and continues the process. On the other hand, if the sensor controller 16 obtains a positive judgment result, it generates a heat map by detecting the position of the conductor in the touch surface 10a (step S13, position detection step), and detects page information of the page on which the user is writing based on the generated heat map (step S14). The details of the process of steps S13 and S14 are the same as the process of steps S1 and S2 described above. Then, the sensor controller 16 compares the page detected in step S14 with the page indicated by the information temporarily stored in the memory 17 in step S2 or the previous step S14, thereby judging whether the page on which the user is writing has been changed (step S15).

[0063] If the sensor controller 16 determines in step S15 that there has been no change, it returns to step S4 and continues the process. On the other hand, if the sensor controller 16 determines in step S15 that there has been a change, it creates a new file for writing handwritten data and writes it to the memory 17 (step S16). After this, the new file thus created becomes the target for writing in steps S7 and S10.

[0064] As described above, according to the position detection device 10 of this embodiment, the sensor controller 16 reads the identification information of each page through the capacitive interaction with the conductive mark M, and detects the page information of the page being written on the basis of the result, so that it is possible to detect the page information of the page being written without providing a protruding portion for page detection on the touch surface 10a, without using an optical or magnetic detection means or a sensor that reads codes such as a two-dimensional code, and without user operation. Moreover, it is also possible to configure so that the conductive mark M can be detected by sharing the sensor 15 for detecting handwritten information.

[0065] Furthermore, according to the position detection device 10 of this embodiment, the sensor controller 16 executes the writing page detection process when the stylus Sa is in a hover state or when there is no paired stylus Sa, so that it becomes possible to appropriately perform the page detection process at a timing when the user is likely to be turning the pages.

[0066] The position detection device 10 according to this embodiment is capable of detecting not only that a page being written on has been changed, but also identifying the page number of the page being written on. Therefore, the sensor controller 16 may add the identified page number to the file stored in the memory 17 as metadata. In this way, it becomes possible to perform processing in accordance with the page number of the notepad P1 in an application of the tablet terminal 30.

[0067] Next, a position detection device 10 according to a second embodiment of the present invention will be described. Fig. 9 is a diagram showing the internal configuration of the position detection device 10 and tablet terminal 30 according to the second embodiment of the present invention. As shown in the figure, the position detection device 10 according to this embodiment is configured to include a sensor controller 16, a memory 17, a wireless communication unit 18, sensors 20 and 21, and a reading unit 22. The configuration of the tablet terminal 30 is the same as that according to the first embodiment.

[0068] As can be seen by comparing Fig. 9 with Fig. 4, the position detection device 10 according to this embodiment differs from the position detection device 10 according to the first embodiment in that it has sensors 20 and 21 instead of the sensor 15, and further has a reading unit 22 in addition to the sensor controller 16. Also, in this embodiment, a stylus Sb corresponding to an electromagnetic induction method (EMR) is used instead of the stylus Sa corresponding to the active electrostatic method. Since the other points are the same as those of the position detection device 10 according to the first embodiment, the following description will focus on the differences from the position detection device 10 according to the first embodiment.

[0069] The sensor 20 is an electromagnetic induction type sensor that detects the stylus Sb. The sensor 21 is a projected capacitive sensor (PCAP) that detects the position of a conductor by a capacitance method. The sensor 20 is used to detect the stylus Sb, and the sensor 21 is used to read the identification information of each page.

[0070] Fig. 10 is a diagram showing the detailed configuration of the sensors 20, 21 and the stylus Sb. As shown in Fig. 10, the sensors 20, 21 are arranged side by side along the X direction. The sensor 21 is disposed to the left of the sensor 20 as seen from the user. This makes it possible to use a sheet-like recording medium having a conductive mark M formed along one side on the left side as seen from the user, like the notepad P1 shown in Fig. 3. The stylus Sb is configured to have an LC resonant circuit made up of a capacitor 50 and an inductor 51.

[0071] First, focusing on the stylus Sb, the inductor 51 generates an induced voltage in response to the magnetic field supplied from the sensor 20, and serves to charge the capacitor 50. After the supply of the magnetic field from the sensor 20 stops, the inductor 51 uses the voltage accumulated in the capacitor 50 to send a signal back to the sensor 20. This sent signal includes, in this order, a continuous signal for position detection, a start signal indicating the end of the continuous signal, and side switch information.

[0072] The capacitor 50 is configured so that its capacitance changes depending on the pressure (=writing pressure value) applied to the pen tip of the stylus Sb. When the capacitance of the capacitor 50 changes, the resonant frequency of the resonant circuit changes, so the frequency of the return signal transmitted as described above also changes depending on the writing pressure value. The sensor controller 16 according to this embodiment detects this frequency change to obtain the writing pressure value from the stylus Sb.

[0073] Next, focusing on sensors 20 and 21, first, the specific configuration of sensor 21 is similar to that of sensor 15 described in the first embodiment, except that the width in the X direction is narrower. Reader 22 generates a heat map by a process similar to that of sensor controller 16 described in the first embodiment, and writes it to a predetermined area in memory 17.

[0074] On the other hand, the sensor 20 is of an electromagnetic induction type and has a different configuration from the capacitance type sensor 15. The configuration of the sensor 20 and the detection of the stylus Sb by the sensor controller 16 using the sensor 20 will be described in detail below with reference to FIG.

[0075] 10, the sensor 20 has a configuration in which multiple loop coils LC are arranged in a rectangular planar area. The multiple loop coils LC include multiple loop coils LC extending in the Y direction and multiple loop coils LC extending in the X direction. One end of each loop coil LC is grounded, and the other end is connected to the sensor controller 16.

[0076] The sensor controller 16 selects the multiple loop coils LC one by one in turn and supplies a current signal to the selected loop coil LC. Then, a magnetic field is generated around the loop coil LC, and an induced voltage is generated in the inductor 51 in the stylus Sb that is in this magnetic field. The sensor controller 16 stops supplying the current signal after a predetermined time has elapsed since starting to supply the current signal. Then, the magnetic field generated around the loop coil LC disappears, and the stylus Sb starts transmitting the above-mentioned return signal. The sensor controller 16 detects the position of the stylus Sb based on the reception strength of the return signal thus transmitted at each loop coil LC, and obtains the data (including the writing pressure value) transmitted by the stylus Sb by decoding the return signal.

[0077] Fig. 11 is a flow diagram of the process performed by the sensor controller 16 according to this embodiment. This diagram also shows the process after the power button 11 shown in Fig. 1 is pressed with the notepad P1 placed on the touch surface 10a, and the position detection device 10 is powered on.

[0078] When the position detection device 10 is powered on, first, the reader 22 generates a heat map (step S20). As described above, the reader 22 stores the generated heat map in a predetermined area of ​​the memory 17. After that, the reader 22 periodically generates a heat map, thereby continuously updating the information in the predetermined area of ​​the memory 17.

[0079] The sensor controller 16 acquires a heat map from a predetermined area of ​​the memory 17 (step S21). Then, based on the acquired heat map, it detects page information of the page being written (step S22) and generates a file for writing handwritten data (step S23). The details of the processing of steps S22 and S23 are the same as the processing of steps S2 and S3 shown in FIG.

[0080] Next, the sensor controller 16 detects the position of the stylus Sb (step S24). The details of this position detection are as described above, and as a result, coordinate data indicating the position of the stylus Sb and data transmitted by the stylus Sb (including the writing pressure value) are acquired. The sensor controller 16 writes the detected position and acquired data in the file generated in step S23 (step S25).

[0081] Next, the sensor controller 16 again acquires a heat map from a predetermined area of ​​the memory 17 (step S26). Then, based on the acquired heat map, the sensor controller 16 detects page information of the page being written (step S27). The details of the processes of steps S26 and S27 are the same as those of steps S21 and S22 described above. After that, the sensor controller 16 compares the page information detected in step S27 with the page information indicated by the information temporarily stored in the memory 17 in step S22 or the previous step S27, thereby determining whether the page being written has been changed (step S28).

[0082] If the sensor controller 16 determines in step S28 that there has been no change, it returns to step S24 and continues the process. On the other hand, if the sensor controller 16 determines in step S28 that there has been a change, it creates a new file for writing handwritten data and writes it to the memory 17 (step S29). After this, the new file thus created becomes the target for writing in step S25.

[0083] As described above, according to the position detection device 10 of this embodiment, the reading unit 22 reads the identification information of each page through electrical interaction with the conductive mark M, and based on the result, the sensor controller 16 detects the page information of the page being written. Therefore, it is possible to detect the page information of the page being written without providing a protruding portion for page detection on the touch surface 10a, without using optical or magnetic detection means or a sensor that reads codes such as two-dimensional codes, and without user operation.

[0084] In addition, according to the position detection device 10 of this embodiment, the sensor 21 used to generate the heat map is provided separately from the sensor 20 for reading the stylus Sb, making it possible to adopt an electromagnetic induction method (EMR) for detecting the stylus Sb, and also making it possible to continue to detect the position of the stylus Sb without interruption even when the stylus Sb is in a hover state.

[0085] According to the position detection device 10 of the present embodiment, the role of the sensor 21 is limited to generating a heat map, so that it is possible to use a sensor 21 optimized for generating a heat map. Specifically, the sampling frequency of the detection signal FDS is higher than that of a normal sensor, so that it is possible to use a sensor with high sensitivity. In addition, in order to reduce the influence of parasitic capacitance, it is possible to generate a heat map by switching between an operation of supplying the detection signal FDS to the linear electrode 15x and receiving it at the linear electrode 15y and an operation of supplying the detection signal FDS to the linear electrode 15y and receiving it at the linear electrode 15x.

[0086] Like the position detection device 10 according to the first embodiment, the position detection device 10 according to this embodiment can also detect that a page being written on has been changed and can also identify the page number of the page being written on. Therefore, the sensor controller 16 may add the identified page number to the file stored in the memory 17 as metadata. In this way, it becomes possible to perform processing according to the page number of the notepad P1 in an application of the tablet terminal 30.

[0087] Next, a position detection device 10 according to a third embodiment of the present invention will be described. Fig. 12 is a diagram showing the internal configurations of the position detection device 10 and tablet terminal 30 according to the third embodiment of the present invention. As shown in the figure, the position detection device 10 according to this embodiment is configured to include a sensor controller 16, a memory 17, a wireless communication unit 18, a sensor 20, and an IC tag reader 23. The configuration of the tablet terminal 30 is the same as that according to the first and second embodiments.

[0088] As can be seen by comparing Fig. 12 with Fig. 9, the position detection device 10 according to this embodiment differs from the position detection device 10 according to the second embodiment in that it does not have the sensor 21 and the reading unit 22, but has an IC tag reader 23. Also, in this embodiment, information written in an IC tag R is used as identification information for each page, instead of a conductor (conductive mark M). Since the present embodiment is otherwise similar to the position detection device 10 according to the second embodiment, the following description will focus on the differences from the position detection device 10 according to the second embodiment.

[0089] First, Fig. 13 is a diagram showing a sheet-shaped recording medium P2 according to the present embodiment and a method for writing identification information on the sheet-shaped recording medium P2. The sheet-shaped recording medium P2 according to the present embodiment is a collection of unbound sheets of paper, typically printer paper. An IC tag R is embedded in each page of the sheet-shaped recording medium P2 in advance.

[0090] FIG. 13 shows an example of a case where a teacher creates an answer sheet for a test at a junior high school or the like. In this example, the teacher creates a manuscript using a computer 70 such as a personal computer, and prints it using a printer 60 to create educational materials (answer sheets) according to this embodiment. The printer 60 has an IC tag writer 62 that writes to an IC tag R near a paper outlet 61 where printed paper is discharged, and is configured to write identification information to the IC tag R of each page at the same time as printing. The creation of answer sheets will be described in more detail below with reference to the functional blocks of the printer 60.

[0091] 14 is a schematic block diagram showing the functional blocks of the printer 60. As shown in the figure, the printer 60 is configured with a control unit 63 and a receiving unit 64 in addition to the IC tag writer 62 also shown in FIG.

[0092] The IC tag writer 62 is configured to have a function of writing identification information to the IC tag R. The receiving unit 64 is connected to the computer 70 by wire or wirelessly, and has a function of transmitting and receiving various signals to and from the computer 70. The signal transmitted from the computer 70 to the receiving unit 64 includes a print signal indicating the contents of printing and identification information to be written to the IC tag R, and the receiving unit 64 is configured to output the received print signal and identification information to the control unit 63.

[0093] The control unit 63 is the central processing unit of the printer 60, and performs printing on paper in response to a print signal supplied from the receiving unit 64, and also uses the IC tag writer 62 to write identification information supplied from the receiving unit 64 to the IC tag R embedded in the paper.

[0094] A teacher who wishes to create an answer sheet uses word processing software on computer 70 to create a draft of the answer sheet including a name column and an answer column, and also uses spreadsheet software to create a correspondence table that associates student names with the identification information of each page to be written to the IC tag R. Then, for example, using the mail merge function of the word processing software, a print signal is generated that includes the corresponding student name in the draft for each record in the correspondence table, and is output to printer 60 together with the corresponding identification information. Upon receiving this, printer 60 performs printing and writing to IC tag R as described above, thereby generating an answer sheet having multiple pages on which different identification information is written.

[0095] Returning to FIG. 12, the configuration of the position detection device 10 according to this embodiment will be described in detail. First, the sensor 20 is an electromagnetic induction type sensor that detects the stylus Sb, as described in the second embodiment. However, since the sensor 21 is not provided, the sensor 20 according to this embodiment is provided over the entire touch surface 10a. Therefore, the user can write on the sheet-shaped recording medium over the entire touch surface 10a. Note that the sensor 20 may be replaced by the capacitance type sensor 15 described in the first embodiment.

[0096] The IC tag reader 23 reads the identification information of each page through electrical interaction with the IC tag R, and performs a process of writing the result to a predetermined area in the memory 17. This reading is performed periodically, similar to the reading by the reading unit 22 described in the second embodiment.

[0097] Fig. 15 is a flow diagram of the process performed by the sensor controller 16 according to this embodiment. This diagram also shows the process after the power button 11 shown in Fig. 1 is pressed with the notepad P1 placed on the touch surface 10a, and the position detection device 10 is powered on.

[0098] When the position detection device 10 is powered on, first, the IC tag reader 23 reads the identification information from the IC tag R (step S30). As described above, the IC tag reader 23 stores the read identification information in a predetermined area of ​​the memory 17. After this, the IC tag reader 23 periodically reads the identification information from the IC tag R, thereby continuously updating the information in the predetermined area of ​​the memory 17.

[0099] The sensor controller 16 acquires identification information from a predetermined area of ​​the memory 17 (step S31). Then, based on the acquired identification information, it detects page information of the page being written (step S32) and generates a file for writing handwritten data (step S33). In step S32, the sensor controller 16 also performs a process of temporarily storing information indicating the detected page in the memory 17.

[0100] Next, the sensor controller 16 detects the position of the stylus Sb (step S34). The detected position and the acquired data are written to the file generated in step S33 (step S35). The details of the processes in steps S34 and S35 are the same as those in steps S24 and S25 shown in FIG.

[0101] Next, the sensor controller 16 again acquires the identification information from a predetermined area of ​​the memory 17 (step S36). Then, based on the acquired identification information, the page information of the page being written is detected (step S37). The details of the processes of steps S36 and S37 are similar to the processes of steps S31 and S32 described above. After that, the sensor controller 16 compares the page detected in step S37 with the page indicated by the information temporarily stored in the memory 17 in step S32 or the previous step S37, thereby determining whether the page being written has been changed (step S38).

[0102] If the sensor controller 16 determines in step S38 that there has been no change, it returns to step S34 and continues the process. On the other hand, if the sensor controller 16 determines in step S38 that there has been a change, it creates a new file for writing handwritten data and writes it to the memory 17 (step S39). After this, the new file thus created becomes the target for writing in step S35.

[0103] As described above, according to the position detection device 10 of this embodiment, the IC tag reader 23 reads the identification information of each page through electrical interaction with the IC tag R, and based on the results, the sensor controller 16 detects the page information of the page being written. Therefore, it is possible to detect the page information of the page being written without providing a protruding portion for page detection on the touch surface 10a, without using optical or magnetic detection means or a sensor that reads codes such as two-dimensional codes, and without user operation.

[0104] Furthermore, according to the position detection device 10 of this embodiment, the IC tag reader 23 for reading identification information is a device separate from the sensor controller 16, so that, as in the second embodiment, it is possible to adopt an electromagnetic induction method (EMR) for detecting the stylus Sb, and it is possible to continue to detect the position of the stylus Sb without interruption even when the stylus Sb is in a hover state.

[0105] Furthermore, with the printer 60 according to this embodiment, the user can write identification information to the IC tag R of each page, making it possible to apply the present invention to sheet-like recording media that are not bound, such as test answer sheets. Therefore, for example, when a teacher collects answer sheets from multiple students, places them together on the touch surface 10a, and grades them while turning them over one by one, it becomes possible to collect handwritten data indicating what the teacher has written on each answer sheet into one file for each answer sheet, and store the data in the memory 35.

[0106] The sensor controller 16 according to the present embodiment may add the acquired identification information as metadata to the file stored in the memory 17. The tablet terminal 30 may also acquire the above-mentioned correspondence table (a table in which student names are associated with identification information for each page written to the IC tag R) from the computer 70, and convert the identification information added to the file into student names. This allows the teacher to check the handwritten data he or she wrote on the answer sheet in association with the name of the student who prepared the answer sheet, in an application on the tablet terminal 30.

[0107] Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and it goes without saying that the present invention can be embodied in various forms without departing from the spirit of the present invention.

[0108] For example, in each of the above embodiments, the sensor controller 16 in the position detection device 10 detects page information of a page being written and performs processing to divide a file, but the position detection device 10 may perform only a part of this processing, and the remaining processing may be performed by the tablet terminal 30. As a specific example, the sensor controller 16 may transmit information indicating a page being written to the tablet terminal 30, and the tablet terminal 30 may divide the file based on the received information.

[0109] In the first and second embodiments, the notepad P1 with the binding margin at the top is used as an example of a sheet-like recording medium, but the present invention is also applicable to a sheet-like recording medium in a magazine-like spread format, that is, in which each page is composed of a right page portion and a left page portion. In this case, the conductive mark M may be placed on either the right page portion or the left page portion. [Explanation of symbols]

[0110] 10 Position detection device 10a Touch Surface 11 Power button 12 Power light 13 Recording medium fixing section 14 Stylus holder 15,21 Projected capacitive sensor 15x,15y linear electrode 16 Sensor Controller 16a Shift Register 16b Correlator 17 Memory 18 Wireless Communication Section 20 Electromagnetic induction sensor 22 Reading unit 23 IC tag reader 30 Tablet devices 31 Touchscreen 32 Wireless Communication Section 33 Stroke Builder 34 Editor 35 Memory 50 Capacitor 51 Inductor 60 Printers 61 Paper output port 62 IC tag writer 63 Control Unit 64 Receiving section 70 Computer FDS detection signal LC Loop Coil M Conductive mark P Pen pressure value P1 Notepad P2 sheet recording medium R IC tag Sa Active electrostatic stylus Sb Electromagnetic induction stylus SW1, SW2 switch information

Claims

1. A position detection device includes a placement surface on which a sheet-like recording medium is placed, the placement surface being configured so that a plurality of pages are superimposed on each other, and detects a position indicated by a stylus in response to a handwriting operation on the sheet-like recording medium placed on the placement surface using a stylus configured to be capable of visibly writing by hand on the sheet-like recording medium placed on the placement surface, the position detection device comprising: a sensor for sensing a page identification member for identifying each of the plurality of pages arranged on the sheet-type recording medium placed on the placement surface; and a control circuit connected to the sensor, the page identification member is made of a conductor, and the sensor is configured to detect the conductor by a capacitance method; the position detection device is configured to be capable of detecting that the stylus is in a state separated from the sheet-shaped recording medium placed on the placement surface, the control circuit is configured to be able to identify a target page of a handwriting operation by the stylus in response to detection by the sensor of the conductor disposed on the sheet-type recording medium when the stylus is separated from the sheet-type recording medium placed on the placement surface. A position detection device comprising:

2. the sensor is configured to detect the conductor disposed on the sheet-type recording medium and to detect a position corresponding to a handwriting operation on the sheet-type recording medium placed on the placement surface by the stylus, 2. The position detection device according to claim 1 .

3. A sensor having a detection method different from the sensor for detecting the conductor arranged on the sheet-shaped recording medium is configured to detect a position corresponding to a handwriting operation by the stylus on the sheet-shaped recording medium placed on the placement surface.

2. The position detection device according to claim 1 .

4. the sensor for detecting a position corresponding to a handwriting operation on the sheet-type recording medium placed on the placement surface by the stylus is configured to detect the position by an electromagnetic induction method; 4. The position detection device according to claim 3.

5. the stylus is configured to be capable of detecting a writing pressure, and the position detection device is configured to be capable of acquiring the writing pressure; The control circuit is configured to detect, based on the detected writing pressure, that the stylus is separated from the sheet-type recording medium placed on the placement surface.

5. The position detection device according to claim 1, wherein the position detection device is a position detection device for detecting a position of the object.

6. The control circuit is configured to identify a target page of a handwriting operation by the stylus in response to a state in which the stylus is separated from the sheet-shaped recording medium placed on the placement surface for a predetermined period of time.

5. The position detection device according to claim 1, wherein the position detection device is a position detection device for detecting a position of the object.

7. A page detection method for detecting a page corresponding to a handwriting operation on a sheet-like recording medium placed on a placement surface on which a sheet-like recording medium is placed, the sheet-like recording medium being configured so that a plurality of pages are superimposed on the placement surface, the page corresponding to a handwriting operation on the sheet-like recording medium placed on the placement surface by a stylus capable of visibly writing by hand on the sheet-like recording medium, the sheet-like recording medium being placed on the placement surface, the page detection method comprising: In response to the stylus being separated from the sheet-type recording medium placed on the placement surface, a page identification member made of a conductor for identifying each of the pages constituting the plurality of pages arranged on the sheet-type recording medium placed on the placement surface is sensed by a capacitance type sensor; A page to be handwritten by the stylus can be identified in response to detection of the conductor arranged on the sheet-shaped recording medium by the sensor.

2. A page detection method comprising:

Images