JP4011233B2 - Written recording system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a writing recording system that digitizes writing information.
[0002]
[Prior art]
In recent years, with the advancement of computers and the speeding up of networks, electronic information processing of various document processes has progressed, and the amount thereof has also increased. Thus, what is called a pen base computer is considered as what converts document processing into electronic information. This pen-based computer does not use paper and is formed by overlaying a transparent pad, which is a coordinate input device, on an LCD (Liquid Crystal Display), etc., and the input point is displayed on the LCD according to the coordinates obtained from the pad. Are displayed directly.
[0003]
However, the pen-based computer is expensive to manufacture, and the LCD is often made of a glass plate, so it is heavy and very fragile. Also, pen-based computers are generally driven by batteries because they are used as portable information devices. However, since a large amount of power is consumed to display an LCD, it is difficult to display constantly. Yes. Furthermore, although a pen-based computer displays electronic documents on a display such as an LCD, the resolution of a display device such as an LCD is still not as high as that of printing on paper by a printing device. Because it is impossible to list the entire document across multiple pages, even electronic documents used in accordance with the demand for paperless printing are once printed on paper. The cause of the increase in quantity. In addition, it is impossible at present to form the thickness of the LCD and the transparent pad to about 1 mm as in the case of paper.
[0004]
On the other hand, from the viewpoint of inputting electronic documents to a personal computer, etc., the entry interface using paper and pen has long been familiar to humans. Still have significant advantages.
[0005]
As described above, due to the advantages of paper such as easy listing and familiar ease of entry, the use of paper does not decrease even today when the computerization of document processing has progressed. The amount of use tends to increase rather, and there is a demand for the development of an electronic device that reduces the amount of paper used. In other words, there is a demand for an electronic device that includes a display device having display quality equivalent to that of paper, and a coordinate detection device that records writing operations using a pen and is as thin and light as paper. .
[0006]
In order to respond to such a demand, an apparatus that enables the computerization of document processing by using paper and a pen and enables computerization of business is considered. As an example of such an apparatus, there is a pen-type coordinate input apparatus proposed in Japanese Patent Laid-Open No. 5-274082. According to this pen-type coordinate input device, the movement of the pen on the plate is detected by counting the number of times that the optical sensor installed in the pen passes through a lattice pattern composed of equally spaced straight lines printed on the plate, The coordinates indicated by the pen are detected.
[0007]
As another example, there is a writing pen and a writing pen device proposed in Japanese Patent Laid-Open No. 8-36452. According to this apparatus, a pattern is printed on writing paper with an ink density corresponding to the absolute coordinates of the writing paper, and the ink density is detected by measuring the reflectance on the writing paper with a light receiving element provided in the pen. In this way, absolute coordinates are detected.
[0008]
[Problems to be solved by the invention]
However, according to the pen-type coordinate input device proposed in JP-A-5-274082, the movement of the pen while the plate and the pen are in contact can be detected. Since the movement of the pen cannot be detected when leaving the plate, once the pen leaves the plate and then touches the plate again, it is impossible to determine where the new point is located. It cannot be entered at any position above, making it unusable.
[0009]
Further, according to the writing pen and writing pen apparatus proposed in Japanese Patent Laid-Open No. 8-36452, it is necessary to accurately detect the multi-stage ink density, but the state of the writing paper surface varies significantly depending on the usage state. In addition, since the surrounding illumination conditions vary greatly, it is difficult to accurately measure the ink density.
[0010]
An object of the present invention is to obtain a writing recording system having a simple configuration and high detection accuracy.
[0011]
An object of the present invention is to obtain a writing recording system that can save paper resources and is excellent in environmental friendliness.
[0012]
An object of the present invention is to obtain a writing recording system that has high usability and can save resources at low cost.
[0013]
[Means for Solving the Problems]
According to the first aspect of the present invention, a paper-like writing medium on which a lattice pattern formed in a two-dimensional direction is arranged by arranging two types of straight lines having different widths in accordance with the M series, and writing on the writing medium. A writing recording system comprising a writing device, wherein the writing device is They are arranged point-symmetrically, Lattice pattern A plurality of light emitting means for emitting light to each of the light emitting means and the light emitting means are respectively combined with each other and arranged symmetrically with respect to each point to receive light from the lattice pattern by the light emitted from each light emitting means. Output electrical signal Multiple light reception Means, The phase difference between the light receiving means opposed to the delay of the measurement time between the light receiving means for the electrical signal output from each light receiving means A moving direction detecting means for detecting a moving direction of the writing device on the writing medium based on Each light receiving Decoding means for decoding the information indicating the nature of the lattice pattern read based on the electrical signal output from the means, M-sequence storage means for storing a code arrangement according to the M-sequence, and the M-sequence storage means A coordinate detection means for identifying a coordinate position of the writing device on the writing medium by comparing a code arrangement according to the M series stored in the memory and information decoded by the decoding means; and the moving direction detection Writing locus detecting means for detecting a writing locus from the coordinate position based on the moving direction detected by the means and the coordinate position detected by the coordinate detecting means.
[0014]
Therefore, the sequence of “0” and “1” is “2”. ^N In accordance with the M series that is a series of “−1” repetitions, for example, a lattice pattern in which the width of the straight line corresponding to “0” is narrowed and the width of the straight line corresponding to “1” is increased is written on the writing medium. In addition, the writing trajectory is decoded as a sequence of “0” and “1” corresponding to the width of the grid pattern based on the electrical signal output when the writing device moved on the writing medium crosses the grid pattern. Further, the detection is based on the coordinate position detected based on the N series information and the moving direction detected based on the electrical signal. Thereby, it becomes possible to reproduce an accurate handwriting, and it becomes possible to obtain a writing recording system with a simple configuration and high detection accuracy.
[0015]
According to the second aspect of the present invention, a paper-like writing medium on which a lattice pattern formed in a two-dimensional direction is arranged by arranging two types of straight lines having different densities in accordance with the M series, and writing on the writing medium. A writing recording system comprising a writing device, wherein the writing device is They are arranged point-symmetrically, Lattice pattern A plurality of light emitting means for emitting light to each of the light emitting means and the light emitting means are respectively combined with each other and arranged symmetrically with respect to each point to receive light from the lattice pattern by the light emitted from each light emitting means. Output electrical signal Multiple light reception Means, The phase difference between the light receiving means opposed to the delay of the measurement time between the light receiving means for the electrical signal output from each light receiving means A moving direction detecting means for detecting a moving direction of the writing device on the writing medium based on Each light receiving Decoding means for decoding the information indicating the nature of the lattice pattern read based on the electrical signal output from the means, M-sequence storage means for storing a code arrangement according to the M-sequence, and the M-sequence storage means A coordinate detection means for detecting a coordinate position of the writing device on the writing medium by comparing a code arrangement according to the M series stored in the memory and information decoded by the decoding means; and the moving direction detection Writing locus detecting means for detecting a writing locus from the coordinate position based on the moving direction detected by the means and the coordinate position detected by the coordinate detecting means.
[0016]
Therefore, the sequence of “0” and “1” is “2”. ^N In accordance with the M series that is a series of “−1” repetitions, for example, a lattice pattern in which the density of a straight line corresponding to “0” is lightened and the density of a straight line corresponding to “1” is increased is written on the writing medium. In addition, the writing trajectory is decoded as a sequence of “0” and “1” corresponding to the density of the grid pattern based on the electrical signal output when the writing device that has moved on the writing medium crosses the grid pattern. Further, the detection is based on the coordinate position detected based on the N series information and the moving direction detected based on the electrical signal. Thereby, it becomes possible to reproduce an accurate handwriting, and it becomes possible to obtain a writing recording system with a simple configuration and high detection accuracy.
[0017]
According to a third aspect of the present invention, there is provided a paper-like writing medium on which a lattice pattern formed in a two-dimensional direction is formed by arranging two types of straight lines having different fluorescence wavelengths according to an M series, and writing on the writing medium. A writing recording system comprising a writing device, wherein the writing device comprises: A plurality of light emitting means that are arranged symmetrically with respect to each other, and are combined with each of the light emitting means and arranged symmetrically with respect to each of the light emitting means. Lattice pattern from Of one fluorescence wavelength Receiving only light Output electrical signals plural first Light reception Means, Each of the light emitting means is combined with each other and arranged symmetrically with respect to each point. Lattice pattern from Other fluorescence wavelengths Receiving only light Output electrical signal plural second Light reception Means, The phase difference between the light receiving means opposed to the delay of the measurement time between the light receiving means for the electrical signal output from each light receiving means A moving direction detecting means for detecting a moving direction of the writing device on the writing medium based on Each light receiving Decoding means for decoding information indicating the nature of the lattice pattern read based on the electrical signal output from the means, M-sequence storage means for storing a code arrangement according to the M-sequence, and the M-sequence storage A coordinate detection means for detecting a coordinate position of the writing device on the writing medium by comparing a code arrangement in accordance with the M series stored in the means and information decoded by the decoding means; Writing locus detecting means for detecting a writing locus from the coordinate position based on the moving direction detected by the detecting means and the coordinate position detected by the coordinate detecting means.
[0018]
Therefore, the sequence of “0” and “1” is “2”. ^N According to the M series which is a series of “−1” repetitions, for example, a lattice pattern in which a linear fluorescence wavelength corresponding to “0” and a linear fluorescence wavelength corresponding to “1” are different is written on the writing medium. Also, the writing trajectory is a sequence of “0” and “1” corresponding to the fluorescence wavelength of the lattice pattern based on the electrical signal output when the writing device that has moved on the writing medium crosses the lattice pattern. Detected based on the coordinate position detected based on the N series information and the moving direction detected based on the electrical signal. Thereby, it becomes possible to reproduce an accurate handwriting, and it becomes possible to obtain a writing recording system with a simple configuration and high detection accuracy.
[0019]
According to a fourth aspect of the present invention, in the writing recording system according to any one of the first to third aspects, the lattice pattern is printed on the writing medium with invisible ink.
[0020]
Therefore, it becomes possible to read the traces written by the writing apparatus without being obstructed by the lattice pattern on the writing medium, thereby increasing convenience.
[0021]
The invention according to claim 5 is the writing recording system according to any one of claims 1 to 3, wherein the lattice pattern is printed on the writing medium with visible ink.
[0022]
Therefore, it is possible to apply widely used printing means, and it is possible to provide a system at a low cost.
[0023]
The invention according to claim 6 is the writing recording system according to claim 4, wherein the writing medium is made of a transparent member.
[0024]
Therefore, for example, it becomes possible to superimpose a writing medium on a document such as a drawing and trace it, and input becomes easy.
[0025]
The invention according to claim 7 is the writing recording system according to any one of claims 1 to 6, wherein the writing device includes writing means for leaving a handwriting on the writing medium.
[0026]
Therefore, processing with no sense of incongruity becomes possible by visually recognizing the written content.
[0027]
The invention according to claim 8 is the writing recording system according to any one of claims 1 to 6, wherein the writing medium has a reversible recording layer that is rewritable by reversibly displaying at least information. is doing.
[0028]
Therefore, by making the writing medium rewritable many times, paper resources can be saved, so that it is possible to provide a system with excellent environmental performance.
[0029]
The invention according to claim 9 is the writing recording system according to claim 8, wherein the reversible recording layer of the writing medium is capable of recording and erasing visible information by reversibly changing optical characteristics by heat energy. Is possible.
[0030]
Therefore, information and the like can be recorded and erased easily and reversibly on the reversible recording layer of the writing medium, and it is possible to provide a system that has high usability and can save resources at a low cost.
[0031]
According to a tenth aspect of the present invention, in the writing recording system according to the ninth aspect, the reversible recording layer of the writing medium includes at least a leuco dye and a developer.
[0032]
Therefore, it is possible to provide a low-cost and high usability system by using a material that can easily rewrite the information on the writing medium with high quality.
[0033]
According to an eleventh aspect of the present invention, in the writing recording system according to the ninth aspect, the reversible recording layer of the writing medium is a resin layer containing particles of an organic low molecular compound.
[0034]
Therefore, it is possible to provide a low-cost and high usability system by using a material that can easily rewrite the information on the writing medium with high quality.
[0035]
A twelfth aspect of the present invention is the writing recording system according to the ninth aspect, wherein the reversible recording layer of the writing medium includes a low-molecular liquid crystal compound or a high-molecular liquid crystal compound.
[0036]
Therefore, it is possible to provide a low-cost and high usability system by using a material that can easily rewrite the information on the writing medium with high quality.
[0037]
DETAILED DESCRIPTION OF THE INVENTION
A first embodiment of the present invention will be described with reference to FIGS. Here, FIG. 1 is a schematic diagram showing the overall configuration of the writing recording system 1. As shown in FIG. 1, this writing recording system 1 is mainly composed of a writing pad 2 which is a writing medium and a pen-type writing device 3. This writing device 3 generates handwriting data, which is digital data based on the writing, by writing on the writing pad 2 in the same manner as writing on paper or the like with a conventional writing instrument (ball pen or the like). The handwritten data is transmitted to an information device (here, a personal computer) 5 via the data transfer device 4.
[0038]
Next, the writing pad 2 will be described. Here, FIG. 2 is a plan view showing the writing pad 2. As shown in FIG. 2, the writing pad 2 includes a base portion 6 formed of a transparent plastic sheet which is a paper-like thin transparent member, for example. Further, on the surface of the base portion 6, a lattice pattern 7 made of straight lines that are orthogonal to each other and arranged in parallel at equal intervals is different from the base portion 6 in terms of optical characteristics (reflectance, absorption rate, fluorescence characteristics). Etc.) are printed with different invisible inks. As an invisible ink, for example, there is a stealth ink manufactured by Hitachi Maxell Corporation having fluorescence characteristics with respect to infrared wavelengths. According to this ink, the lattice pattern 7 can hardly be seen by humans and can be machine-readable in the infrared region, so that the lattice pattern 7 can be applied to the surface of the base portion 6 without obstructing writing or printing with visible ink. Can be printed on. Therefore, the user can read the traces he / she wrote without being obstructed by the lattice pattern 7, and the convenience is enhanced. Hereinafter, the ink is described as having infrared fluorescence characteristics, but it is only necessary that the optical characteristics of the base portion 6 are detectable, and Rhodamine B having fluorescence characteristics with respect to ultraviolet wavelengths can be used. is there. In FIG. 2, for the sake of explanation, it is displayed so as to be visible to humans, but the lattice pattern 7 is actually invisible.
[0039]
Next, the lattice pattern 7 will be described. The straight lines that form the lattice pattern 7 and are arranged in parallel at equal intervals and perpendicular to each other to form a lattice are the codes “0, 1 according to the M sequence (longest sequence) in order to represent the absolute coordinates of the writing pad 2. The print is printed with different thicknesses. Here, as shown in FIG. 2, a thick straight line of the lattice pattern 7 represents digital data “1”, and a thin straight line of the lattice pattern 7 represents digital data “0”. The M sequence refers to a sequence having the longest period among code sequences generated by a shift register having a certain length and feedback. If N is the number of stages in the shift register,
L = 2 ^N -1
Is the length of the M sequence, that is, the longest sequence. This M sequence is an N-stage linear feedback shift register having a feedback tap based on an exclusive OR (mod 2) of a certain M sequence and an M sequence obtained by shifting the M sequence, except for all zeros (for example, “00000”). Generated by giving an initial value. For example, as shown in FIG.
h (x) = x ^Five + X ^Four + X ² + X + 1
According to the generation circuit based on the fifth-order primitive polynomial shown by the following, when starting from “10000” as the initial condition, the generated sequence is
“10000101011101100011111001101001”
The sequence length, that is, the period is “2”. ^Five −1 = 31 ”-bit M-sequence is obtained. In other words, when N = 5, 31“ 0, 1 ”sequences are obtained. Since all of the sequences of “0, 1” are extracted, it is possible to specify which part of the entire sequence is. Therefore, “N of 2” of “0, 1” arranged based on the M sequence. It is possible to specify which position in all the series corresponds to N series among the series of “multiple minus one”. The lattice pattern 7 is printed according to the M series generated in this way.
[0040]
Here, the lattice pattern 7 shown in FIG. 2 shows a pattern example of the lattice pattern 7 on the writing pad 2 when N = 5 and the lower left of the drawing is the origin. “N” sufficient to cover part 6 is selected. As described above, for example, the M sequence when N = 5 is
“10000101011101100011111001101001”
The width of the grid pattern 7 in the case of “1” is thick, and the width of the grid pattern 7 in the case of “0” is narrowed. On the axis, from the left in the figure,
It follows the M series as “thick, thin, thin, thin, thin, thick, thin, thick, thin, thick, thick, thick, thin, thick, thick ...”. Similarly, on the vertical Y-axis,
It follows the M series as “thick, thin, thin, thin, thin, thick, thin, thick, thin, thick, thick, thick, thin, thick, thick ...”.
[0041]
For example, assuming that the size of the writing pad 2 is A4 size and the interval of the lattice is 0.3 mm (this is about this with the current optical mouse pad), the long side of A4 is 210 mm / 0. .3mm = 700 straight lines exist. This number is "2 ^Ten Since it is smaller than −1 = 1023 ″, it is sufficient to create the lattice pattern 7 of the writing pad 2 according to the M series of N = 10. Here, the interval between the ten lattices is 0.3 mm × 10 = The absolute position on the pad of A4 can be detected by moving 3 mm, and according to the lattice pattern 7 of the writing pad 2, the size of characters that are generally easy to see is about 3 mm. Thus, it becomes possible to obtain absolute coordinates while inputting one character.
[0042]
In this way, the base portion 6 is formed of a thin transparent plastic sheet, and the lattice pattern 7 is printed with invisible ink, so that the writing pad 2 can be effectively used for tracing such as drawings.
[0043]
The base unit 6 may be made of white plain paper or the like, and the lattice pattern 7 may be printed with visible ink. Furthermore, the lattice pattern 7 does not necessarily have to be on the surface of the base portion 6 and may have a transparent protective layer on the surface.
[0044]
The grid pattern 7 may be printed in advance at the time of shipment from a factory or the like prior to use, or may be printed using a printer or the like when used by a user. Further, a document by a word processor, a drawing by a drawing software, or the like may be printed in advance with visible ink.
[0045]
Moreover, the lattice pattern 7 should just be installed and printed in parallel with the two directions which mutually cross | intersect, the direction does not necessarily need to orthogonally cross, and it is parallel to each edge | side of the base part 6 of the writing pad 2. There is no need.
[0046]
Next, the writing apparatus 3 which comprises the writing recording system 1 with the writing pad 2 is demonstrated. Here, FIG. 4 is a perspective view schematically showing the structure of the writing apparatus 3. As shown in FIG. 4, the writing apparatus 3 has a pen tip 9 that functions as a writing means at the tip of a cylindrical housing 8 having the same appearance as a conventional ballpoint pen or the like. The nib 9 is configured to be writable in the same manner as a felt pen or a ballpoint pen. In this case, the ink used for writing is visible and does not interfere with the detection of the lattice pattern 7 printed on the writing pad 2. When the lattice pattern 7 is printed with an invisible infrared fluorescent ink, the writing ink needs to be an ink that transmits infrared light and does not contain carbon black or the like. Further, in the housing 8, a lattice pattern detection device 10 that detects a difference in optical characteristics between the base portion 6 of the writing pad 2 and the lattice pattern 7 printed on the base portion 6, the writing pad 2, and A pen pressure detection device 11 for detecting contact with the pen tip 9, a power source 12 including a rechargeable secondary battery, and the like are provided.
[0047]
The lattice pattern detection apparatus 10 will be described in detail. Here, FIG. 5 is a cross-sectional view showing the vicinity of the lattice pattern detection device 10 of the writing device 3, and FIG. 6 is a cross-sectional view taken along line AA 'in FIG. As shown in FIG. 5, the lattice pattern detection device 10 of the writing device 3 includes a light emitting element 13 (13a, 13b, 13c, 13d) configured by a laser diode, an LED, and the like, a photodiode (PD), and the like. And a light receiving element 14 (14a, 14b, 14c, 14d). The combination of the light emitting element 13 and the light receiving element 14 includes four sets of the light emitting element 13a and the light receiving element 14a, the light emitting element 13b and the light receiving element 14b, the light emitting element 13c and the light receiving element 14c, and the light emitting element 13d and the light receiving element 14d. ing. The light emitting elements 13 (13a, 13b, 13c, 13d) are arranged point-symmetrically around the pen tip 9, and the light receiving elements 14 (14a, 14b, 14c, 14d) are also centered on the pen tip 9. They are arranged point-symmetrically. Further, as shown in FIG. 6, an optical fiber 15 is connected to each light emitting element 13, and an optical fiber 16 is connected to each light receiving element 14, and is guided near the tip of the writing apparatus 3. In addition, a condensing lens 17 is provided in the vicinity of the optical fiber 15 located near the tip of the writing apparatus 3, and a condensing lens 18 and an optical filter are provided in the vicinity of the optical fiber 16 located near the tip of the writing apparatus 3. 19 is provided. The optical filter 19 passes the wavelengths of the grid pattern 7 on the writing pad 2 when invisible infrared fluorescent ink sensitive to invisible wavelengths such as infrared light is printed. By providing such an optical filter 19, interference with detection due to disturbance light is less likely to occur, and stable detection is possible.
[0048]
The light from the light emitting element 13 is guided to the tip of the writing apparatus 3 by the optical fiber 15 and illuminates one point of the writing pad 2 by the condenser lens 17. When the lattice pattern 7 is printed on the bright spot, the light is reflected, scattered or fluorescent by the ink. The fluorescence from the writing pad 2 is collected on the light receiving element 14 via the condenser lens 18 on the light receiving element 14 side, the optical filter 19 and the optical fiber 16. Since the light receiving element 14 generates a current according to the intensity of the collected light, the current value is different between the lattice pattern 7 of the writing pad 2 and the base portion 6.
[0049]
In addition, such a lattice pattern detection device 10 does not always exhibit stable optical characteristics of the lattice pattern 7 of the writing pad 2 due to the influence of external light such as an indoor fluorescent lamp. A circuit 20 (see FIG. 7) is provided so that the lattice pattern 7 can be detected stably by detecting the output change of the light receiving element 14. Here, FIG. 7 is a circuit diagram showing the differentiation circuit 20. As shown in FIG. 7, the differentiating circuit 20 converts the current output from the light receiving element 14 that has detected the fluorescence generated in the invisible infrared fluorescent ink on the writing pad 2 by the light emitting element 13 into a voltage by the current-voltage conversion element 21. The voltage is converted and compared with the voltage generated in the ΔV voltage generation circuit 25 constituted by the Zener diodes 22 and 23 and the capacitor 24 in the comparator 26 to detect ΔV. FIG. 8 shows an output example. FIG. 8A shows an output waveform of the light receiving element 14, and FIG. 8B shows a waveform after conversion by the differentiation circuit 20.
[0050]
Further, as shown in FIG. 6, the writing pressure detection device 11 measures the intensity of input light to the light receiving elements 14 (14 a, 14 b, 14 c, 14 d) of the lattice pattern detection device 10, thereby The distance from the pen tip 9 is measured. For example, when the pen tip 9 of the writing device 3 is in the air, the intensity of the input light to the light receiving element 14 becomes weak, and when the writing device 3 approaches the writing pad 2, the intensity of the input light to the light receiving element 14 becomes strong. Thus, the distance between the writing pad 2 and the pen tip 9 is measured. The writing pressure detection device 11 is not limited to such a configuration, and the pen tip 9 has a slight stroke in the direction along the pen axis, and a micro switch (not shown) is provided at the end of the stroke. ) To detect the contact between the pen tip 9 and the writing pad 2 by pressing the micro switch while the pen tip 9 is pressed in the pen axis direction.
[0051]
Next, the electrical connection of each part built in the writing apparatus 3 will be described with reference to FIG. The writing device 3 includes a microcomputer composed of a one-chip CPU or the like that stores a control program, and has a built-in drive / control circuit 27 that centrally controls each unit. The drive / control circuit 27 is a wireless communication interface such as RF wireless communication or infrared communication such as IrDA, in addition to the lattice pattern detection device 10 and the pen pressure detection device 11 described above. A data transmission / reception circuit 28 that performs transmission / reception of data, a storage circuit 29 constituted by an EEPROM, a data buffer 30, a relative movement recording device 31, a coordinate conversion device 32, and an M series showing the pattern of the lattice pattern 7 on the writing pad 2 described above Are connected to an M-sequence absolute coordinate table 33, a relative movement recording buffer 34, a data decoder 35, and the like that function as M-sequence storage means for storing in advance.
[0052]
In the writing apparatus 3 having such a configuration, a handwriting recording function that is a function that the control program causes the drive / control circuit 20 to execute will be described. Here, FIG. 10 is a flowchart schematically showing the flow of the handwriting recording process. As shown in FIG. 10, in the handwriting recording process, first, after the power supply 12 is turned on, the pen pressure detection device 11 waits for detection of pendown (step S1). When pen-down is detected based on the measurement of the distance between the writing pad 2 and the pen tip 9 of the writing device 3 (Y in step S1), the lattice pattern detection device 10 is driven, and the writing pad 2 and the pen of the writing device 3 are driven. An electrical signal based on the lattice pattern 7 at the position of contact with the tip 9 is output (step S2). Here, the function of the reading means is executed.
[0053]
In the subsequent step S3, a lattice pattern thickness detection process is executed. The detection of the thickness of the lattice pattern is performed by comparing the interval between the straight lines of the lattice pattern 7 arranged at equal intervals with the width of each straight line of the lattice pattern 7 and depending on the size thereof. Is executed. Here, FIG. 11 is a time chart showing an output example of the electric signal in the light receiving element 14. As shown in FIG. 11, Thigh 1 to 5 represent times when the output of the electrical signal from the light receiving element 14 is high, and Tlow 1 to 4 represent times when the output of the electrical signal from the light receiving element 14 is low. Here, Thigh 1 to 5 in which the signal output is high is the time during which the lattice pattern 7 is detected, and when the width of the lattice pattern 7 is large, the signal output time is long. Further, Tlow1 to 4 where the signal is low are times when the lattice pattern 7 is not detected, and the intervals of the straight lines of the lattice pattern 7 are equal, so the time is constant. . Further, the signal output time when the width of the lattice pattern 7 is thick is longer than the time when the lattice pattern 7 is not detected, and the signal output time when the width of the lattice pattern 7 is narrow does not detect the lattice pattern 7. It is shorter than time. Therefore, when the time during which the signal output is high is ThighN, and the time when the signal output just before is low is TlowN,
ThighN> TlowN
In this case, the detected lattice pattern 7 can be identified as being thick,
ThighN <TlowN
In this case, the detected lattice pattern 7 can be identified as thin. In the example of FIG. 11, it can be determined that Thigh1 and Thigh3 are thin.
[0054]
Here, FIG. 12 is a flowchart schematically showing the flow of the lattice pattern thickness detection process. As shown in FIG. 12, in the grid pattern thickness detection process, a continuous grid pattern 7 is detected, so that the electrical signal output is high (ThighN) and the electrical signal output when the grid pattern 7 is not detected is low. (TlowN) is measured (steps S31, 32), and each time (ThighN, TlowN) is compared (step S33).
[0055]
If “ThighN> TlowN” (Y in step S33), it is determined that the lattice pattern 7 is thick (step S34).
[0056]
On the other hand, if “ThighN <TlowN” (N in step S33), it is determined that the lattice pattern 7 is thin (step S35). The lattice pattern thickness detection process (step S3) is thus completed.
[0057]
Subsequently, in step S4, a moving direction detection process is executed. Detection of the moving direction is executed based on a delay in measurement time between a plurality of light receiving elements 14 and a phase shift between the light receiving elements 14 facing each other. Here, FIG. 13 is a schematic diagram showing an example of a movement state of the writing device 3 with respect to the lattice pattern 7, and FIG. 14 is a time chart showing an output waveform of an electric signal of each light receiving element 14 in FIG. As shown in FIG. 13, when the writing device 3 moves on the lattice pattern 7 of the writing pad 2 from the left direction to the right direction (X direction indicated by the arrow), the output waveform of the electric signal in each light receiving element 14 is compared. Then, as shown in FIG. 14, the output of the light receiving element 14 c that receives the light emitted from the light emitting element 13 c positioned at the head of the writing device 3 in the traveling direction is positioned behind the writing device 3 in the traveling direction. The light receiving elements 14a, 14b, and 14d that receive the light emitted from the other light emitting elements 13a, 13b, and 13d are output with a phase delay. In addition, the outputs from the light receiving element 14a that receives light emitted from the light emitting elements 13a that are orthogonal to each other perpendicular to the X direction and the light receiving element 14d that receives light emitted from the light emitting element 13d have the same phase. The same applies to the case of moving from the lower direction shown in FIG. 13 to the upper direction (Y direction indicated by the arrow). Although not particularly shown, the light is emitted from the light emitting element 13a located at the head of the writing device 3 in the traveling direction. The light receiving elements 14b, 14c, and 14d that receive the light emitted from the other light emitting elements 13b, 13c, and 13d located behind the writing device 3 in the traveling direction are in phase with respect to the output of the light receiving element 14a that receives the emitted light. Output from the light receiving element 14b that receives the light emitted from the light emitting element 13b that is orthogonal to the Y direction and the light receiving element 14c that receives the light emitted from the light emitting element 13c. Are in phase. Thereby, the horizontal (X direction) and vertical (Y direction) movement of the writing device 3 is detected by detecting a delay in measurement time between the light receiving elements 14 and a phase shift between the light receiving elements 14 facing each other. Each of these can be detected, and any combination such as a movement in an oblique direction can be detected by combining these. Here, the function of the moving direction detecting means is executed. Since the lattice pattern 7 is arranged on the base part 6 of the writing pad 2 at equal intervals, when the moving direction of the writing device 3 is detected, the writing device 3 crosses based on the detected moving direction. The number of lattice patterns 7 is counted (the relative coordinates are added or decreased), and the relative movement is detected. For example, when the rise time of the signal of the light receiving element 14 installed on the right is earlier than the rise time of the signal of the light receiving element 14 installed on the left, the writing apparatus 3 determines that the movement is to the right and sets the relative coordinates. Increase by one. When the rise time of the signal of the light receiving element 14 installed on the left is earlier than the rise time of the signal of the light receiving element 14 installed on the right, the writing apparatus 3 determines that the movement is left, and the relative coordinates are determined. Decrease by one.
[0058]
In step S5, when the data decoder 35 determines that the grid pattern 7 is thick by the grid pattern thickness detection process, the digital data “1” is recorded in the data buffer 30, and the grid pattern thickness detection process performs the grid pattern thickness detection process. If it is determined that the pattern 7 is thin, digital data “0” is recorded in the data buffer 30. Here, the function of the decoding means is executed. In subsequent step S6, the relative movement data of the writing apparatus 3 detected by the movement direction detection process is temporarily recorded in the relative movement recording buffer 34 and then recorded in the relative movement recording apparatus 31.
[0059]
In step S7, whether or not there is data recorded in the data buffer 30 as much as absolute coordinates can be detected, in other words, N series of M series forming a pattern of the lattice pattern 7 of the writing pad 2 is arranged. It is determined whether or not enough data is stored in the data buffer 30. When the processes from Steps S1 to S6 are repeated and data for only N arrangements of the M series forming the lattice pattern 7 pattern of the writing pad 2 is stored in the data buffer 30 (Y in Step S7) ) In the coordinate conversion device 32, the data stored in the data buffer 30 is compared with a series of "0, 1" sequences defined by the M series stored in the M series absolute coordinate table 33 in advance. Then, the absolute coordinates are obtained by verifying which part in the numerical sequence corresponds (step S8). Here, the function of the coordinate detection means is executed. For example, if the sequence of detected data is “01010”, it is an M sequence stored in the M sequence absolute coordinate table 33.
“10000101011101100011111001101001”
It can be seen that it is the fifth digit from the left in the 31-digit sequence. Similarly, if the detected data sequence is “01101”, it is found that the data is the eighth digit from the right.
[0060]
Next, the relative movement amount stored in the relative movement recording device 31 is read (step S9), and the absolute coordinates are corrected (step S10). Here, the function of the writing trajectory detection means is executed. For example, if the detected data array is “01010” in the X direction and the number of crossed grid lines is “5”, the data has moved 5 counts from the absolute coordinate position corresponding to “01010”. become. Steps S1 to S10 are repeated until pen-up is detected (N in step S1).
[0061]
The absolute coordinate data obtained by the above processing is temporarily stored in the storage circuit 29 and then sent as handwriting data to the personal computer 5 via the data transmission / reception circuit 28 and the data transfer device 4 for use. . The storage of absolute coordinate data is automatically performed while the user is writing, and the transmission of absolute coordinate data is explicitly instructed by the user by a switch (not shown) or the like when the data input is separated to some extent. The The software on the personal computer 5 receives and stores handwriting data from the writing device 3, reproduces the handwriting, recognizes characters from the handwriting including the stroke order, and adds the original data of the data printed on the writing pad 2 and the handwriting data. Cooperation with information is performed.
[0062]
In addition, when the absolute coordinate data is stored in the storage circuit 29, for example, when sampling is performed at a sampling frequency of 1 kHz, the intensity of fluorescence from the writing pad 2 is thresholded and binarized. 1 Mbyte is sufficient for 1 hour storage. In addition, the amount of data necessary for storage is expected to be about 1/10 by using a so-called compression technique.
[0063]
In addition, although the case 8 of the writing device 3 of the present embodiment is illustrated as a cylindrical shape, in this case, the orientation of the lattice pattern detection device 10 may not be constant depending on how the writing user holds. In view of this, a gyro sensor or the like may be provided in order to detect rotation by a user's holding method or writing operation. Moreover, you may form the housing | casing 8 of the writing apparatus 3 in a triangular prism shape.
[0064]
In addition, the movement direction may be detected using a sensor such as an acceleration sensor. As such a sensor, an acceleration sensor using a piezoelectric effect or resistance variation of a semiconductor formed on a cantilever can be used. By installing the acceleration sensor in a direction orthogonal to the long axis of the writing device 3, the moving direction of the writing device 3 can be detected. Furthermore, the detection of the moving direction by the sensor and the detection of the moving direction by the lattice pattern 7 may be used together.
[0065]
Next, a second embodiment of the present invention will be described with reference to FIGS. The same parts as those described in the first embodiment of the present invention are denoted by the same reference numerals, and description thereof is also omitted. This embodiment is different only in that a rewritable writing pad 40 is used as a writing medium in place of the writing pad 2 of the first embodiment. The writing pad 40 has substantially the same size as the writing pad 2 of the first embodiment, and has an A4 size that is formed in a paper shape as a whole.
[0066]
Here, FIG. 15 is a vertical side view showing the writing pad 40. As shown in FIG. 15, the writing pad 40 has a base film 41 on which a lattice pattern 7 is printed with an invisible infrared fluorescent ink, and an image display layer 42 and a protective film are formed on the lattice pattern 7 of the base film 41. The layer 43 is sequentially laminated. The base film 41 is made of a white resin having a good thermal conductivity, and the protective layer 43 is made of a colorless resin having a good translucency (for example, a PET resin).
[0067]
The image display layer 42 is a reversible recording layer that can reversibly display and display information. The image display layer 42 is a thermal recording method using a CTC (Color Thermo Chromic) film, a magnetic recording method, a photochromic recording method, an electrochromic recording method. Methods can be used. In particular, in the present embodiment, a heat-sensitive recording method, that is, a thermoreversible recording layer in which optical characteristics reversibly change with heat energy and visible information can be recorded and erased is preferred. As a material capable of reversible recording by this thermal energy, at least one of a layer containing a leuco dye and a developer, a resin layer containing particles of an organic low-molecular compound, a layer containing a low-molecular or high-molecular liquid crystal compound, etc. A reversible recording layer composed of is preferable.
[0068]
First, a case where a layer containing at least a leuco dye and a developer is applied as the image display layer 42 will be described. The layer containing at least a leuco dye and a developer is formed by dispersing a leuco dye and a developer in a resin binder. Examples of the leuco dye include phthalide compounds, azaphthalide compounds, fluorane compounds, Known dye precursors such as phenothiazine compounds and leucooramine compounds can be used. Specifically, known leuco dyes described in JP-A No. 05-124360 can be used. Since the leuco dye does not absorb light having an infrared wavelength, it does not hinder the detection of the lattice pattern 7 using the infrared fluorescent ink.
[0069]
Examples of the color developer include compounds having a structure having a color developing ability for developing a leuco dye in the molecule. For example, it is a compound having a structure in which a phenolic hydroxyl group, a carboxylic acid group, a phosphoric acid group or the like and a structure for controlling cohesive force between molecules or a long-chain hydrocarbon group are linked. The connecting part may be through a divalent group containing a hetero atom, and the long chain hydrocarbon group may contain a divalent group or an aromatic hydrocarbon group containing a hetero atom. Specifically, known color developers described in JP-A No. 05-124360 and the like can be used.
[0070]
Further, as the resin binder, for example, polyvinyl chloride, polyvinyl acetate, vinyl chloride vinyl acetate copolymer, polyvinyl acetal, polyvinyl butyral, polycarbonate, polyarylate, polysulfone, polyethersulfone, polyphenylene oxide, fluorine resin, polyimide, polyamide , Polyamideimide, Polybenzimidazole, Polystyrene, Styrene copolymer, Phenoxy resin, Polyester, Aromatic polyester, Polyurethane, Polyacrylate, Polymethacrylate, (Meth) acrylate copolymer, Maleic acid Copolymer, epoxy resin, alkyd resin, silicone resin, phenol resin, polyvinyl alcohol, modified polyvinyl alcohol, polyvinyl pyrrolidone, polyethylene Oxide, polypropylene oxide, methyl cellulose, ethyl cellulose, carboxymethyl cellulose, hydroxyethyl cellulose, starch, it may be mentioned gelatin, casein, and the like.
[0071]
Further, for the purpose of increasing the strength of the film of the image display layer 42, various curing agents and crosslinking agents may be added. Examples of such curing agents and crosslinking agents include compounds having isocyanate groups, polyamide epichlorohydrin resins, compounds having epoxy groups, glyoxal, zirconium compounds and the like.
[0072]
The image display layer 42 can also be formed using an electron beam curable or ultraviolet curable binder. Examples of such a binder include a compound having an ethylenically unsaturated bond. Specific examples of these are:
1. Poly (meth) acrylates of aliphatic, alicyclic and aromatic polyhydric alcohols and polyalkylene glycols
2. Poly (meth) acrylate of polyhydric alcohol in which polyalkylene oxide is added to aliphatic, alicyclic, aromatic, or araliphatic polyhydric alcohol
3. Polyester poly (meth) acrylate
4). Polyurethane poly (meth) acrylate
5). Epoxy poly (meth) acrylate
6). Polyamide poly (meth) acrylate
7). Poly (meth) acryloyloxyalkyl phosphate ester
8). Vinyl or diene compounds having a (meth) acryloyl group in the side chain or terminal
9. Monofunctional (meth) acrylate, vinylpyrrolidone, (meth) acryloyl compound
10. Cyano compounds having an ethylenically unsaturated bond
11. Mono- or polycarboxylic acids having an ethylenically unsaturated bond, and alkali metal salts, ammonium salts, amine salts thereof, etc.
12 Ethylenically unsaturated (meth) acrylamide or alkyl-substituted (meth) acrylamide and multimers thereof
13. Vinyl lactam and polyvinyl lactam compounds
14 Mono- or polyethers having ethylenically unsaturated bonds and esters thereof
15. Esters of alcohols having ethylenically unsaturated bonds
16. Polyalcohols having ethylenically unsaturated bonds and esters thereof
17. Aromatic compounds having one or more ethylenically unsaturated bonds, such as styrene and divinylbenzene
18. Polyorganosiloxane compounds having (meth) acryloyloxy groups in the side chain or terminal
19. Silicone compound having an ethylenically unsaturated bond
20. Multimers or oligoester (meth) acrylate modified products of the compounds 1 to 19 above
Etc.
[0073]
When the image display layer 42 is formed using an ultraviolet curable binder, a photopolymerization initiator is mixed and used. Examples of the photopolymerization initiator include acetophenones such as dichloroacetophenone or trichloroacetophenone, 1-hydroxycyclohexyl phenyl ketone, benzophenone, Michler ketone, benzoin, benzoin alkyl ether, benzyldimethyl ketal, tetramethylthiuram monosulfide, thioxanthone, azo Examples thereof include compounds, diaryl iodonium salts, triaryl sulfonium salts, and bis (trichloromethyl) triazine compounds.
[0074]
The image display layer 42 using the leuco dye and developer as described above is colored / decolored by the process shown in FIG. When the initial decolored state (A) is heated, the temperature T ₁ As described above, the leuco dye and the developer are melted and mixed to develop a color (B), and when this state is rapidly cooled, the colored state is fixed (C). When the coloring state (C) is heated, the coloring temperature T ₁ Lower temperature T ₂ When the color is erased (D) and cooled, the color erased state becomes the same as the initial state.
[0075]
Accordingly, the white color of the base film 41 is visually recognized through the protective layer 43 when the image display layer 42 is transparent, and the color is visually recognized via the protective layer 43 when the color of the image display layer 42 is changed to black. . Thereby, the image display layer 42 of the writing pad 40 is adjusted to reversibly change between a transparent state and a black state by heating. Utilizing such a property, a document by a word processor, a drawing by drawing software, and the like are printed on the writing pad 40 in a visible state in advance.
[0076]
Such writing with the thermal energy on the writing pad 40 is easy to print with, for example, a thermal sublimation printing apparatus using a thermal head. Further, according to such a thermal sublimation type printing apparatus, it becomes easy to erase with the same writing thermal head by changing conditions such as heating temperature and time. Therefore, in this case, since various types of information can be printed by the printing apparatus, the user can appropriately set it during printing, instead of embedding it as fixed information in the writing pad 40 from the beginning. That is, since the writing pad 40 can be used repeatedly, paper resources can be saved.
[0077]
Next, as a modification, a case where a resin layer containing particles of an organic low molecular compound is applied as the image display layer 42 will be described. The light scattering property of the resin layer containing the particles of the organic low molecular compound has a property that its transparency reversibly changes depending on the temperature.
[0078]
The resin used for the resin layer containing particles of such an organic low molecular weight compound is a material that forms a layer in which an organic low molecular weight substance is uniformly dispersed and held and affects the transparency at the time of maximum transparency. Therefore, the resin base material is preferably a resin having good transparency, mechanical stability, and good film forming properties. Such resins include polyvinyl chloride; vinyl chloride-vinyl acetate copolymer, vinyl chloride-vinyl acetate-vinyl alcohol copolymer, vinyl chloride-vinyl acetate-maleic acid copolymer, vinyl chloride-acrylate copolymer. Copolymers and other vinyl chloride copolymers; polyvinylidene chloride, vinylidene chloride-vinyl chloride copolymers, vinylidene chloride copolymers such as vinylidene chloride-acrylonitrile copolymers; polyesters; polyamides; polyacrylates or polymethacrylates or acrylates -Methacrylate copolymer; silicon resin and the like. These may be used alone or in combination of two or more.
[0079]
Moreover, as an organic low molecular weight compound used for the resin layer containing the particle | grains of this organic low molecular weight compound, generally a thing with a melting | fusing point of 30-200 degreeC, Preferably about 50-150 degreeC is used. Such organic low molecular weight compounds include alkanols; alkanediols; halogen alkanols or halogen alkanediols; alkylamines; alkanes; alkenes; alkynes; halogen alkanes; halogen alkenes; Or unsaturated mono- or dicarboxylic acids or their esters, amides or ammonium salts; saturated or unsaturated halogen fatty acids or their esters, amides or ammonium salts; allyl carboxylic acids or their esters, amides or ammonium salts; halogen allyl carboxylic acids Or ester, amide or ammonium salt thereof; thioalcohol; thiocarboxylic acid or ester, amine or ammonium salt thereof; thioalcohol And the like carboxylic acid ester. These may be used alone or in combination of two or more. These compounds have 10 to 60 carbon atoms, preferably 10 to 38 carbon atoms, and particularly preferably 10 to 30 carbon atoms. The alcohol group moiety in the ester may be saturated or not saturated, and may be halogen-substituted. In any case, the organic low molecular weight compound is at least one of oxygen, nitrogen, sulfur and halogen in the molecule, for example, —OH, —COOH, —CONH—, —COOR, —NH—, —NH. ₂ , —S—, —S—S—, —O—, halogen and the like are preferable. Furthermore, in order to widen the temperature range at which the transparency can be achieved, the above-mentioned organic low-molecular compound may be appropriately combined, or the organic low-molecular compound may be combined with another material having a different melting point. These are disclosed in, for example, Japanese Patent Application Laid-Open Nos. 63-39378 and 63-130380, and Japanese Patent Application Nos. 63-14754 and 1-140109. It is not limited to these.
[0080]
The image display layer 42 composed of a resin layer containing particles of an organic low molecular compound composed of these organic low molecular compounds and a resin becomes transparent and cloudy in the process shown in FIG. FIG. 17 is a graph showing a change in transparency due to heat. An image display layer 42 mainly composed of a resin and an organic low molecular weight compound dispersed in the resin is, for example, T ₀ It is in a cloudy and opaque state at the following normal temperature. This is the temperature T ₂ When it is heated, it becomes transparent, and in this state, T ₀ It remains transparent even when returned to the normal temperature below. T _Three When heated to the above temperature, a translucent state intermediate between maximum transparency and maximum opacity is achieved. Next, when the temperature is lowered, the first cloudy opaque state is restored without taking the transparent state again. This opaque state is T ₁ ~ T ₂ After heating to a temperature between ₀ When cooled to the following temperature, it can take an intermediate state between transparent and opaque. Also, those that become transparent at room temperature are again T _Three If it returns to normal temperature after heating to the above temperature, it will return to a cloudy opaque state again.
[0081]
Furthermore, as a modification, a case where a layer containing a low molecular weight or high molecular liquid crystal compound is applied to the image display layer 42 will be described. As the polymer liquid crystal compound used in the image display layer 42, main chain type and side chain type molecular liquid crystals in which mesogens (molecules showing liquid crystallinity) are bonded to the main chain or side chain are used. The polymer liquid crystal compound can be usually produced by polymerizing a polymerizable mesogenic compound (referred to as a mesogenic monomer) or by adding an addition-reactive mesogenic compound to a reactive polymer such as hydrogenated polysilicone. . Such technology
Makromol. Chem., 179, p273 (1978), Eur, Poly. J., 18, p651 (1982) and
Mol. Cryst. Liq. Cryst., 169, p167 (1989) and the like. The polymer liquid crystal compound used in the present invention can also be produced by a similar method.
[0082]
Examples of the mesogenic monomer and the mesogenic compound capable of addition reaction include biphenyl, phenylbenzoate, cyclohexylbenzene, azoxybenzene, azobenzene, azomethine, phenylpyrimidine, diphenylacetylene, biphenylbenzoate, cyclohexylbiphenyl, Typical examples include various compounds in which acrylate groups, methacrylate groups or vinyl groups are bonded to rigid molecules (mesogens) such as terphenyls, preferably via an alkyl spacer of a predetermined length. As mentioned.
[0083]
Next, a third embodiment of the present invention will be described with reference to FIGS. In addition, the same code | symbol is used about the part same as the part demonstrated in 1st or 2nd embodiment of this invention, and description is also abbreviate | omitted. The present embodiment uses a writing pad 50 printed with a lattice pattern 51 in which the M series is represented by ink density instead of the lattice pattern 7 used for the writing pad 2 of the first embodiment as a writing medium. It is different only in.
[0084]
Here, FIG. 18 is a plan view showing the writing pad 50. As shown in FIG. 18, the writing pad 50 includes a base portion 6 formed of, for example, a paper-like thin transparent plastic sheet. Further, on the surface of the base portion 6, a lattice pattern 51 composed of straight lines that are orthogonal to each other and arranged in parallel at equal intervals is different from the base portion 6 in terms of optical characteristics (reflectance, absorption rate, fluorescence characteristics). Etc.) are printed with different invisible inks. In FIG. 18, for the sake of explanation, the display is made so as to be visible to humans, but the lattice pattern 51 is actually invisible.
[0085]
Next, the lattice pattern 51 will be described. FIG. 18 shows an example of the pattern of the lattice pattern 51 on the writing pad 50 when N = 5 and the lower left of the drawing is the origin. In practice, the pattern “51” is sufficient to cover the base portion 6 of the writing pad 51. Select N ″. As described above, for example, the M sequence when N = 5 is
“10000101011101100011111001101001”
The ink density of the grid pattern 51 in the case of “1” is high, and the ink density of the grid pattern 51 in the case of “0” is made light, so that the density of the ink printed on the grid pattern 51 of the writing pad 50 is expressed. Are in order from the left of the figure on the horizontal X-axis,
It follows the M series as "Dark / Light / Light / Light / Light / Dark / Light / Dark / Light / Dark / Dark / Dark / Light / Dark / Dark ...". Similarly, on the vertical Y-axis,
It follows the M series as "Dark / Light / Light / Light / Light / Dark / Light / Dark / Light / Dark / Dark / Dark / Light / Dark / Dark ...".
[0086]
When the writing device 3 is moved on such a writing pad 50, the output waveform of the electric signal in the light receiving element 14 is, for example, a waveform as shown in FIG. As shown in FIG. 19, when the writing apparatus 3 moves on the grid pattern 51 having a high ink density, the output of the electrical signal from the light receiving element 14 becomes high, and the writing apparatus 3 is on the grid pattern 51 having a low ink density. Is moved, the output of the electrical signal from the light receiving element 14 becomes low. In the present embodiment, when it is determined that the ink density of the lattice pattern 51 is high based on the difference in the output of the electrical signal, digital data “1” is recorded in the data buffer 30, and the lattice pattern 51 is recorded. When it is determined that the ink density is low, digital data “0” is recorded in the data buffer 30. For example, the ink density shown in FIG. 19 is “dark, light, dark, light, dark,...” In this order, so that the digital data in this case is decoded as “10101.
[0087]
Therefore, absolute coordinate data can also be obtained by using such a writing pad 50 and the writing device 3.
[0088]
Although not particularly illustrated, the same effect can be obtained even if the lattice pattern 7 of the writing pad 40 described in the second embodiment is replaced with the lattice pattern 51.
[0089]
Next, a fourth embodiment of the present invention will be described with reference to FIGS. In addition, the same code | symbol is used about the same part as the part demonstrated in 1st and 2nd embodiment of this invention, and description is also abbreviate | omitted. This embodiment is different in that the writing pad 60 is used as a writing medium instead of the writing pad 2 of the first embodiment, and the writing device 70 is used instead of the writing device 3.
[0090]
Here, FIG. 20 is a plan view showing the writing pad 60. As shown in FIG. 20, the writing pad 60 includes a base portion 6 formed of, for example, a paper-like thin transparent plastic sheet. Further, on the surface of the base portion 6, a lattice pattern 61 composed of straight lines that are orthogonal to each other and arranged in parallel at equal intervals is printed. The lattice pattern 61 is printed with two types of inks having different fluorescence wavelengths.
[0091]
Next, the lattice pattern 61 will be described. FIG. 20 shows a pattern example of the lattice pattern 61 on the writing pad 60 in the case where N = 5 and the lower left of the drawing is the origin, but in actuality, it is sufficient to cover the base portion 6 of the writing pad 61. Select N ″. As described above, for example, the M sequence when N = 5 is
“10000101011101100011111001101001”
The grid pattern 61 of the writing pad 60 is printed by increasing the fluorescence wavelength of the ink of the grid pattern 61 in the case of “1” and shortening the fluorescence wavelength of the ink of the grid pattern 61 in the case of “0”. The fluorescence wavelength of the ink obtained on the horizontal X-axis in order from the left of the figure,
It follows the M series like "long, short, short, short, short, long, short, long, short, long, long, long, short, long, long ...". Similarly, on the vertical Y-axis,
It follows the M series like "long, short, short, short, short, long, short, long, short, long, long, long, short, long, long ...".
[0092]
Next, the writing device 70 will be described. Here, FIG. 21 is a transverse sectional view showing the vicinity of the lattice pattern detecting device 71 of the writing device 70, and FIG. 22 is a sectional view taken along the line BB ′ in FIG. As shown in FIG. 21, in the lattice pattern detection device 71 of the writing device 70, four light emitting / receiving devices 72 (72 a, 72 b, 72 c, 72 d) are arranged point-symmetrically around the pen tip 9. These light emitting / receiving devices 72 are configured by combining a light emitting element 73 formed of a laser diode, an LED, or the like and two light receiving elements 74 formed of a photodiode (PD) or the like. More specifically, the light emitting / receiving device 72 is configured by arranging light receiving elements 74 at both ends of the light emitting elements 73 and arranging them in a line. Further, as shown in FIG. 22, an optical fiber 75 is connected to the light emitting element 73, and an optical fiber 76 is connected to each of the light receiving elements 74, and is led to the vicinity of the tip of the writing apparatus 70. In addition, a condensing lens 77 is provided in the vicinity of the optical fiber 75 located near the tip of the writing apparatus 70, and a condensing lens 78 is provided in the vicinity of the optical fiber 76 located near the tip of the writing apparatus 70. ing. Further, an optical filter 79 is provided between one optical fiber 76 and the condensing lens 78, and an optical filter 80 is provided between the other optical fiber 76 and the condensing lens 78. The optical filter 79 and the optical filter 80 are wavelength selection filters, and allow only light having a predetermined wavelength to pass therethrough. Here, the optical filter 79 transmits only light from an ink having a long fluorescent wavelength used for printing the lattice pattern 61 of the writing pad 60, and the optical filter 80 is an ink having a short fluorescent wavelength used for printing the lattice pattern 61 of the writing pad 60. Only light from is transmitted. With such a configuration, light from the light emitting element 73 is guided to the tip of the writing device 70 by the optical fiber 75 and illuminates one point of the writing pad 60 by the condensing lens 77. When the lattice pattern 61 is printed on the bright spot, the light is reflected, scattered or fluorescent by the ink. Light from the ink having a long fluorescence wavelength used for printing the lattice pattern 61 of the writing pad 60 is collected on one light receiving element 74 via the optical filter 79 and the optical fiber 76. Here, the first reading means is realized. Further, light from the ink having a short fluorescent wavelength used for printing the lattice pattern 61 of the writing pad 60 is collected on the other light receiving element 74 via the optical filter 80 and the optical fiber 76. Here, the second reading means is realized. That is, each light receiving element 74 of the light receiving and emitting device 72 generates a current only when receiving a predetermined fluorescence wavelength.
[0093]
Therefore, when the writing device 70 moves on the writing pad 60, the digital data “1” is determined when it is determined that the fluorescence wavelength of the ink of the lattice pattern 61 is long based on the difference in the output destination of the electrical signal. Is recorded in the data buffer 30, and if it is determined that the fluorescence wavelength of the ink of the lattice pattern 61 is short, the digital data “0” is recorded in the data buffer 30.
[0094]
Therefore, absolute coordinate data can also be obtained by using such a writing pad 60 and the writing device 70.
[0095]
Although not shown in particular, even if the lattice pattern 7 of the writing pad 40 described in the second embodiment is replaced with the lattice pattern 61, the same effect can be obtained.
[0096]
In each embodiment, the detection of the moving direction is performed based on the detection time difference of the light receiving element. However, the present invention is not limited to this. For example, the fluorescence is detected in the horizontal direction (X direction) and the vertical direction (Y direction). Two types of ink with different wavelengths (a total of four types) are used, and the writing device has a lattice pattern detection device provided with two optical filters corresponding to each fluorescence wavelength for horizontal (X direction) and vertical (Y direction). You may make it prepare for each. In addition, when using a writing pad that can be formed in layers using a CTC film or the like, by changing the depth of the lattice pattern for horizontal (X direction) and vertical (Y direction), The movement direction may be detected.
[0097]
Furthermore, although the pen-type writing device is used in each embodiment, the present invention is not limited to this, and the outer shape may be the same as that of a conventionally known mouse. Even in this case, unlike the conventional optical mouse that can only detect relative movement, it is possible to input absolute coordinates, which improves usability.
[0098]
【The invention's effect】
According to the first aspect of the present invention, the arrangement of “0” and “1” is “2”. ^N In accordance with the M series that is a series of “−1” repetitions, for example, a lattice pattern in which the width of the straight line corresponding to “0” is narrowed and the width of the straight line corresponding to “1” is widened is written on the writing medium. N series information of “0” and “1” decoded in accordance with the width of the grid pattern based on the electric signal output when the writing apparatus moved on the writing medium crosses the grid pattern. By detecting the writing trajectory based on the coordinate position detected on the basis of the movement direction and the moving direction detected on the basis of the electrical signal, it is possible to reproduce the accurate handwriting, so that the writing recording with high detection accuracy can be achieved with a simple configuration. You can get a system.
[0099]
According to the second aspect of the present invention, the arrangement of “0” and “1” is “2”. ^N In accordance with the M series which is a series of “−1” repetitions, for example, a lattice pattern in which the density of the straight line corresponding to “0” is lightened and the density of the straight line corresponding to “1” is darkened is written on the writing medium. N series information decoded as “0” and “1” in accordance with the density of the grid pattern based on the electrical signal output when the writing apparatus moved on the writing medium crosses the grid pattern. By detecting the writing trajectory based on the coordinate position detected on the basis of the movement direction and the moving direction detected on the basis of the electrical signal, it is possible to reproduce the accurate handwriting, so that the writing recording with high detection accuracy can be achieved with a simple configuration. You can get a system.
[0100]
According to the third aspect of the present invention, the arrangement of “0” and “1” is “2”. ^N In accordance with the M series which is a series of “−1” repetitions, for example, a lattice pattern in which a linear fluorescence wavelength corresponding to “0” is different from a linear fluorescence wavelength corresponding to “1” is written on the writing medium. The N number of decoded “0” s and “1” s according to the fluorescence wavelength of the lattice pattern based on the electrical signal output when the writing device moved on the writing medium crosses the lattice pattern. By detecting the writing trajectory based on the coordinate position detected based on the series information and the moving direction detected based on the electrical signal, it is possible to reproduce the accurate handwriting, so the detection accuracy is high with a simple configuration. A writing and recording system can be obtained.
[0101]
According to the invention described in claim 4, in the writing recording system according to any one of claims 1 to 3, the lattice pattern is obstructed by the lattice pattern by printing on the writing medium with the ink having invisibility. Since you can read the marks you wrote, you can improve convenience.
[0102]
According to the invention described in claim 5, in the writing recording system according to any one of claims 1 to 3, printing widely spread by printing the lattice pattern on the writing medium with visible ink. Since the means can be applied, the system can be provided at low cost.
[0103]
According to the invention described in claim 6, in the writing recording system according to claim 4, the writing medium can be traced by superimposing the writing medium on a document such as a drawing by configuring the writing medium with a transparent member. Therefore, input can be facilitated.
[0104]
According to the invention described in claim 7, in the writing recording system according to any one of claims 1 to 6, the writing content is visually recognized by providing the writing device with writing means for leaving a handwriting on the writing medium. Therefore, the process can be executed without any sense of incongruity.
[0105]
According to the invention described in claim 8, in the writing recording system according to any one of claims 1 to 6, the writing medium has a reversible recording layer that can be rewritten by reversibly displaying at least information. By having the writing medium, the writing medium can be used rewritable many times, paper resources can be saved, and a system with excellent environmental performance can be provided.
[0106]
According to the invention described in claim 9, in the writing recording system according to claim 8, the reversible recording layer of the writing medium is capable of recording and erasing visible information by reversibly changing optical characteristics by heat energy. As a result, information and the like can be recorded and erased easily and reversibly on the reversible recording layer of the writing medium, providing a system with high usability and low resource consumption. can do.
[0107]
According to a tenth aspect of the present invention, in the writing recording system according to the ninth aspect, the reversible recording layer of the writing medium includes at least a leuco dye and a developer, thereby rewriting information on the writing medium. Therefore, it is possible to provide a system with high usability at a low cost.
[0108]
According to the eleventh aspect of the present invention, in the writing recording system according to the ninth aspect, the reversible recording layer of the writing medium is a resin layer containing particles of an organic low molecular weight compound. Since a material that can rewrite information easily and with high quality can be used, a low-cost and high usability system can be provided.
[0109]
According to the invention described in claim 12, in the writing recording system according to claim 9, the reversible recording layer of the writing medium contains the low-molecular liquid crystal compound or the high-molecular liquid crystal compound. Since a material that can rewrite information easily and with high quality can be used, a low-cost and high usability system can be provided.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing an overall configuration of a writing recording system according to a first embodiment of the present invention.
FIG. 2 is a plan view showing a writing pad.
FIG. 3 is a circuit diagram showing an M-sequence generation circuit based on a fifth-order primitive polynomial.
FIG. 4 is a perspective view schematically showing the structure of a writing apparatus.
FIG. 5 is a cross-sectional view showing the vicinity of the lattice pattern detection device of the writing device.
6 is a cross-sectional view taken along the line AA ′ in FIG. 5. FIG.
FIG. 7 is a circuit diagram showing a differentiating circuit.
8A is a time chart showing an output waveform of a light receiving element, and FIG. 8B is a time chart showing a waveform after conversion by a differentiation circuit.
FIG. 9 is a block diagram showing an electrical connection of each part built in the writing apparatus.
FIG. 10 is a flowchart schematically showing a flow of handwriting recording processing.
FIG. 11 is a time chart showing an output example of an electrical signal in the light receiving element.
FIG. 12 is a flowchart schematically showing a flow of a lattice pattern thickness detection process.
FIG. 13 is a schematic diagram illustrating an example of a moving state of the writing apparatus with respect to the lattice pattern.
14 is a time chart showing output waveforms of electrical signals of the respective light receiving elements in FIG.
FIG. 15 is a longitudinal side view showing a writing pad according to a second embodiment of the present invention.
FIG. 16 is a graph illustrating a process in which a reversible recording layer using a leuco dye and a developer develops and decolors.
FIG. 17 is a graph illustrating a process in which a reversible recording layer composed of an organic low molecule and a resin is transparent and cloudy.
FIG. 18 is a plan view showing a writing pad according to a third embodiment of the present invention.
FIG. 19 is a time chart showing an example of an output waveform of an electric signal of the light receiving element.
FIG. 20 is a plan view showing a writing pad according to a fourth embodiment of the present invention.
FIG. 21 is a cross-sectional view showing the vicinity of the lattice pattern detection device of the writing device.
22 is a cross-sectional view taken along the line BB ′ in FIG.
[Explanation of symbols]
2,40,50,60 Writing medium
3,70 writing device
7, 51, 61 lattice pattern
9 Writing means
33 M-sequence storage means
42 Reversible recording layer

Claims (12)

A writing recording system comprising: a paper-like writing medium on which a lattice pattern formed in a two-dimensional direction by arranging two types of straight lines with different widths according to an M series; and a writing device for writing on the writing medium Because
The writing device comprises:
A plurality of light emitting means that are arranged point-symmetrically and emit light to the lattice pattern ;
A plurality of light receiving means that are combined with each of the light emitting means and arranged symmetrically with respect to each other, each receiving light from the lattice pattern by light emitted from each light emitting means, and outputting an electrical signal;
The moving direction of the writing device on the writing medium based on a delay in measurement time between the light receiving means and a phase shift between the light receiving means opposed to each other with respect to the electrical signal output from each light receiving means A moving direction detecting means for detecting
Decoding means for decoding information indicating the nature of the lattice pattern read based on the electrical signals output from the light receiving means;
M sequence storage means for storing a code sequence according to the M sequence;
Coordinate detection means for comparing the code sequence according to the M series stored in the M series storage means and the information decoded by the decoding means to identify the coordinate position of the writing device on the writing medium; ,
A writing trajectory detecting means for detecting a writing trajectory from the coordinate position based on the moving direction detected by the moving direction detecting means and the coordinate position detected by the coordinate detecting means;
Written recording system. A writing recording system comprising: a paper-like writing medium on which a lattice pattern formed in a two-dimensional direction is arranged by arranging two types of straight lines having different densities according to an M series; and a writing device for writing on the writing medium Because
The writing device comprises:
A plurality of light emitting means that are arranged point-symmetrically and emit light to the lattice pattern ;
A plurality of light receiving means that are combined with each of the light emitting means and arranged symmetrically with respect to each other, each receiving light from the lattice pattern by light emitted from each light emitting means, and outputting an electrical signal;
The moving direction of the writing device on the writing medium based on a delay in measurement time between the light receiving means and a phase shift between the light receiving means opposed to each other with respect to the electrical signal output from each light receiving means A moving direction detecting means for detecting
Decoding means for decoding information indicating the nature of the lattice pattern read based on the electrical signals output from the light receiving means;
M sequence storage means for storing a code sequence according to the M sequence;
Coordinate detecting means for detecting the coordinate position of the writing device on the writing medium by comparing the code sequence according to the M series stored in the M series storage means and the information decoded by the decoding means; ,
A writing trajectory detecting means for detecting a writing trajectory from the coordinate position based on the moving direction detected by the moving direction detecting means and the coordinate position detected by the coordinate detecting means;
Written recording system. Written recording comprising a paper-like writing medium on which a lattice pattern formed in a two-dimensional direction is arranged by arranging two types of straight lines having different fluorescence wavelengths according to an M series, and a writing device for writing on the writing medium A system,
The writing device comprises:
A plurality of light emitting means that are arranged point-symmetrically and emit light to the lattice pattern;
Wherein arranged in each point symmetry with combined respectively with each of the light emitting means, said plurality of outputs each electrical signal by receiving one fluorescence wavelength of light only from the lattice pattern by the light emitted from the light emitting means a A light receiving means;
Wherein arranged in each point symmetry with combined respectively with each of the light emitting means, said plurality of outputting an electric signal by receiving other fluorescent wavelengths of light respectively only from the lattice pattern by the light emitted from the light emitting means a Two light receiving means;
The moving direction of the writing device on the writing medium based on a delay in measurement time between the light receiving means and a phase shift between the light receiving means opposed to each other with respect to the electrical signal output from each light receiving means A moving direction detecting means for detecting
Decoding means for decoding information indicating the nature of the lattice pattern read based on the electrical signals output from the light receiving means;
M sequence storage means for storing a code sequence according to the M sequence;
Coordinate detecting means for detecting the coordinate position of the writing device on the writing medium by comparing the code sequence according to the M series stored in the M series storage means and the information decoded by the decoding means; ,
A writing trajectory detecting means for detecting a writing trajectory from the coordinate position based on the moving direction detected by the moving direction detecting means and the coordinate position detected by the coordinate detecting means;
Written recording system.   The writing recording system according to any one of claims 1 to 3, wherein the lattice pattern is printed on the writing medium with ink having invisibility.   The writing recording system according to claim 1, wherein the lattice pattern is printed on the writing medium with visible ink.   The writing recording system according to claim 4, wherein the writing medium is made of a transparent member.   The writing recording system according to any one of claims 1 to 6, wherein the writing device includes writing means for leaving a handwriting on the writing medium.   7. The writing recording system according to claim 1, wherein the writing medium has a reversible recording layer that can be rewritten by reversibly displaying at least information. 9. The writing recording system according to claim 8, wherein the reversible recording layer of the writing medium is capable of recording and erasing visible information by reversibly changing optical characteristics by heat energy.   The writing recording system according to claim 9, wherein the reversible recording layer of the writing medium includes at least a leuco dye and a developer.   The writing recording system according to claim 9, wherein the reversible recording layer of the writing medium is a resin layer containing particles of an organic low molecular weight compound.   The writing recording system according to claim 9, wherein the reversible recording layer of the writing medium includes a low-molecular liquid crystal compound or a high-molecular liquid crystal compound.

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