JP3983403B2 - Written recording system, writing pen and recording object - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
This invention relates to a writing recording system.And writing pens and objects to be recordedAbout.
[0002]
[Prior art]
Japanese Patent Application Laid-Open No. H8-36452 discloses a technique for specifying coordinates of a pen tip by attaching a pattern with different optical reflectivity to a writing paper and reading it with a light emitting element and a light receiving element provided on the pen side. Is disclosed. The pattern attached to the writing paper has two-dimensional coordinates that intersect on the paper. According to such a technique, the handwriting can be input as digital data only by performing an operation of writing on a writing paper with a pen.
[0003]
[Problems to be solved by the invention]
However, the conventional technique requires a pattern in two directions in order to detect two-dimensional information drawn on the paper surface. Therefore, there is a problem that the detection sensitivity is lowered at the intersection of the patterns.
[0004]
An object of the present invention is to provide a writing recording system with improved detection sensitivity.
[0005]
Another object of the present invention is to provide a writing recording system capable of more natural writing.
[0006]
Another object of the present invention is to provide a writing recording system with further improved detection sensitivity.
[0007]
Another object of the present invention is to provide a writing recording system that enables high-resolution coordinate input.
[0008]
Another object of the present invention is to provide a writing recording system capable of preventing a pattern from interfering with writing.
[0009]
[Means for Solving the Problems]
  The invention described in claim 1In a writing recording system including a storage object and a writing pen, the recording object includes a pattern including a density pattern capable of specifying x-axis and y-axis coordinate values from a two-dimensional frequency distribution obtained by converting an image of a predetermined region. The writing pen comprises: an imaging unit that captures an image of the predetermined area of the recording object; and the image captured by the imaging unit is converted into a frequency distribution in the x-axis direction and a frequency distribution in the y-axis direction. A frequency discriminating means for conversion, an x-coordinate value is calculated from the frequency distribution in the x-axis direction converted by the frequency discriminating means, and a y-coordinate is calculated from the frequency distribution in the y-axis direction converted by the frequency discriminating means. And a coordinate calculation means for calculating a value.
[0010]
Therefore, since the patterns do not cross each other, the detection sensitivity can be improved.
[0011]
  The invention according to claim 2 is the writing recording system according to claim 1,The writing pen isA rotation angle sensor for detecting a rotation angle about the axis of the writing pen, and the coordinate calculationmeansSought inThe x coordinate value and the y coordinate valueIs corrected with the rotation angle.meansAndfurtherPreparationIt is characterized by.
[0012]
Therefore, since the influence of the rotation around the axis of the pen with respect to the obtained two-dimensional coordinates is eliminated, more natural writing is possible.
[0013]
  The invention according to claim 3 is the writing recording system according to claim 1 or 2,The writing pen isAn inclination angle sensor for detecting an inclination angle of the writing pen with respect to a recording object, and the coordinate calculationmeansSought inThe x coordinate value and the y coordinate valueIs corrected with the tilt angle.meansAndfurtherPreparationIt is characterized by.
[0014]
Therefore, since the influence of the pen inclination on the obtained two-dimensional coordinates can be eliminated, the detection accuracy can be further improved.
[0015]
  The invention according to claim 4 is the writing recording system according to claim 1 or 2,The writing pen isPrior to processing by the tilt angle sensor for detecting the tilt angle of the axis of the writing pen relative to the recording object, and processing by the frequency discriminating unit,Imaging meanssoImaged abovethe imageSaidConversion that converts the image projected onto a plane perpendicular to the axis of the writing pen using the tilt anglemeansAndfurtherPreparationIt is characterized by.
[0016]
Therefore, since the influence of the pen inclination on the obtained two-dimensional coordinates can be eliminated, the detection accuracy can be further improved.
[0017]
  The invention according to claim 5 is the writing recording system according to any one of claims 1 to 4,The writing pen isSaidTaken with the imaging meansWaveform conversion that converts an image into a waveform that represents the change in reflectance of the imagemeansAnd the waveform conversionmeansPhase difference detection that finds the phase difference between the waveform converted by the and the reference waveformmeansAnd the coordinate calculationmeansSought inThe x coordinate value and the y coordinate valueIs corrected by the phase difference.meansAndfurtherPreparationIt is characterized by.
[0018]
Accordingly, since the phase representing the change in reflectance of the image is also taken into consideration, the detection accuracy can be further improved.
[0019]
  The invention according to claim 6 is the writing recording system according to any one of claims 1 to 5,The writing pen isSaidThe image captured by the imaging means is photoelectrically converted into image information,Arranged so that the line directions are orthogonal to each otherx-axis direction and y-axis direction1D line sensorThe frequency discrimination means converts the frequency distribution in the x-axis direction from the image information photoelectrically converted by the one-dimensional line sensor in the x-axis direction, and photoelectrically converts the frequency distribution in the y-axis direction by the one-dimensional line sensor in the y-axis direction. Converting the converted image information into a frequency distribution in the y-axis direction..
[0020]
Therefore, cost can be reduced by using a one-dimensional line sensor for the optical element.
[0021]
  The invention according to claim 7 is the writing recording system according to any one of claims 1 to 6, wherein the recording object is:SaidThe pattern consists of a change in reflectance other than visible lightIt is characterized by.
[0022]
  Therefore, the pattern can be made invisible so that it does not get in the way of writing.
[0023]
  The invention according to claim 8 is the writing recording system according to any one of claims 1 to 6, wherein the recording object is:SaidWhen the pattern is irradiated with energy rays, it consists of the intensity change of light emission in the region other than visible light.It is characterized by.
[0024]
  Therefore, the pattern can be made invisible so that it does not get in the way of writing.
[0025]
  The invention according to claim 9 is the writing recording system according to any one of claims 1 to 8,The writing pen isSaidImaging meansFor receiving lightTheRoundAnd characterized by.
[0026]
  Therefore, since the opening is made circular, it is difficult to be affected by the detection accuracy due to the posture of the writing pen, so that the detection accuracy can be further improved.
[0027]
  The invention according to claim 10 is the writing recording system according to any one of claims 1 to 9, wherein the recording object is a reversible recording layer capable of reversibly recording information, and the reversibility. And a support for supporting the recording layer.It is characterized by.
[0028]
  Accordingly, the recorded object can erase the written content, and thus the recorded object can be reused.
[0029]
  The invention according to claim 11In the writing pen constituting the coordinate detection system, together with a storage object including a pattern including a density pattern capable of specifying x-axis and y-axis coordinate values from a two-dimensional frequency distribution obtained by converting an image of a predetermined area, the recording target Imaging means for capturing an image of the predetermined region of the object, frequency discrimination means for converting the image captured by the imaging means into a frequency distribution in the x-axis direction and a frequency distribution in the y-axis direction, and the frequency discrimination means Coordinate calculating means for calculating an x coordinate from the frequency distribution in the x-axis direction converted by the above-mentioned frequency, and calculating a y-coordinate from the frequency distribution in the y-axis direction converted by the frequency discriminating means. Features.
[0030]
  The invention according to claim 12An imaging unit that captures an image of a predetermined area, a frequency discrimination unit that converts the image captured by the imaging unit into a frequency distribution in the x-axis direction and a frequency distribution in the y-axis direction, and the frequency discrimination unit Coordinates together with a writing pen comprising: coordinate calculation means for calculating x coordinates from the frequency distribution in the x axis direction and calculating y coordinates from the frequency distribution in the y axis direction converted by the frequency discrimination means The storage object constituting the detection system is characterized by comprising a pattern including a density pattern capable of specifying the x-axis and y-axis coordinate values from the two-dimensional frequency distribution obtained by converting the image of the predetermined region.
[0031]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a perspective view showing an overall configuration of a writing recording system according to an embodiment of the present invention. The writing recording system 1 includes a writing pen 2 and a specific paper 3 that is a recording object, and writing on the writing pen 2 on the specific paper 3 causes the handwriting data to be stored in a predetermined storage unit. In addition, it is transferred as digital data to another information device (not shown).
[0032]
FIG. 2 is a functional block diagram illustrating a configuration example of the writing pen 2. The writing pen 2 is provided with an imaging unit 4 that reads an image of a paper surface located at or near the pen tip. In the imaging unit 4, an image is formed on the optical element 5 and subjected to photoelectric conversion, and the image signal is processed as image information by the signal processing unit 6. The processed image signal is converted by the frequency discriminator 7 into a frequency representing the change in reflectance of the image, and independent frequency distributions are obtained in the two-dimensional x-axis direction and y-axis direction. The coordinate calculation unit 8 obtains the two-dimensional coordinates of the pen tip position from the frequency distribution by a method described later. The two-dimensional coordinates are temporarily stored in the storage unit 9 and then transmitted to an external information device (not shown) by the communication unit 10. The control unit 11 controls each unit of the imaging unit 4 to the communication unit 10. A writing unit 12 is provided at the pen tip, and the writing locus is also written on the specific paper 3.
[0033]
In FIG.
H = sin {2π (x²+ Y²) / 2}
The pattern with the density pattern is shown. The center of this pattern is set to the origin (0, 0). When this pattern is changed to the frequency axis, each x-axis and y-axis component of the frequency has a property corresponding to the coordinate value. And this pattern is concentric and does not cross each other.
[0034]
That is, on the specific paper 3, there is formed a pattern in which the optical reflectance is changed as shown in FIG. 3A and does not intersect with each other. The coordinate calculation unit 8 can specify the two-dimensional coordinate from the two-dimensional frequency distribution in the x-axis direction and the y-axis direction.
[0035]
Since the writing unit 12 is formed at the pen tip of the writing pen 2, it is difficult for the image pickup unit 4 to capture the image of the pen tip. Therefore, the coordinate calculation unit 8 offsets the center of the image from the pen tip. An operation to shift the coordinate value by the amount is also required.
[0036]
Further, in order to improve the resolution of the central portion, a pattern as shown in FIG. 3B may be used instead of that shown in FIG.
[0037]
By attaching the pattern as shown in FIG. 3 to the specific paper 3, there is no place where the patterns intersect and the detection sensitivity is higher than when two patterns are separately provided in the x-axis direction and the y-axis direction. Can be improved.
[0038]
Although the pattern shown in FIG. 3 is visible for the sake of explanation, in the case of reflected light having a wavelength sensitive to the optical element 5, invisible light is preferable from the viewpoint of use. That is, it is desirable that the pattern attached to the specific paper 3 is formed by a change in reflectance other than visible light. In addition, it is desirable that the light emission intensity change in a region other than visible light when irradiated with energy rays. In this way, if the pattern attached to the specific paper 3 is made invisible, it can be prevented from interfering with writing.
[0039]
FIG. 4 is a conceptual diagram of the writing pen 2. As shown in FIG. 4, the writing pen 2 may be provided with a gyro sensor 13 that detects a rotational angular velocity around the axis of the writing pen 2. FIG. 5 shows a functional block diagram including the gyro sensor 13. As shown in the figure, the rotational angular velocity around the axis of the writing pen 2 detected by the gyro sensor 13 is integrated by the integrating unit 14 which is a rotational angle sensor, and the rotational angle around the axis of the writing pen 2 is obtained. It is done. Then, the correction unit 15 as the first correction unit corrects the two-dimensional coordinates obtained by the coordinate calculation unit 8 with the rotation angle obtained by the integration unit 14. Thus, since the influence of the rotation around the axis of the writing pen 2 with respect to the two-dimensional coordinates obtained by the coordinate calculation unit 8 is eliminated, more natural writing can be performed. In this example, the gyro sensor 13 is used as means for detecting the rotation angle, but other means may be used as long as the rotation angle can be detected.
[0040]
FIG. 6 is a conceptual diagram of the writing pen 2. As shown in FIG. 6, the writing pen 2 may be provided with an inclinometer 16 that is an inclination angle sensor that detects an inclination angle of the axis of the writing pen 2 with respect to the specific paper 3. FIG. 7 shows a functional block diagram including the inclinometer 16. As shown in the figure, the inclination angle of the writing pen 2 with respect to the specific paper 3 is detected by the inclinometer 16, and the correction unit 17, which is the second correction unit, obtains the coordinate calculation unit 8. The two-dimensional coordinates are corrected with the inclination angle obtained by the inclinometer 16.
[0041]
That is, the axis of the writing pen 2 is not always perpendicular to the paper surface of the specific paper 3 during writing, and the inclination angle θ (see FIG. 6) with respect to the paper surface naturally changes one by one. As described above, when the axis of the writing pen 2 is not perpendicular to the plane of the specific paper 3, the image obtained by the imaging unit 4 does not accurately reflect the pattern on the specific paper 3. As a result, the calculated value of the two-dimensional coordinates obtained by the coordinate calculation unit 8 may cause a large error. Therefore, by correcting the two-dimensional coordinates obtained by the coordinate calculation unit 8 with the inclination angle obtained by the inclinometer 16, if such an error is removed, the detection accuracy can be further improved.
[0042]
In addition, as shown in FIG. 8, prior to processing by the frequency discriminating unit 7, the image signal read by the optical element 5 is converted by the conversion unit 18 using the inclination angle detected by the inclinometer 16. You may make it convert into the image signal of the image projected on the plane perpendicular | vertical with respect to an axial center.
[0043]
  When entering a region where the frequency representing the change in reflectance of the pattern attached to the specific paper 3 is low, specifying the coordinates only with this frequency lowers the detection resolution. Therefore, first, an approximate two-dimensional coordinate is specified by frequency, and an image signal read by an optical element is obtained as shown in FIG.WaveformThe conversion unit 21 represents the change in reflectance of the image.WaveformConvert this toWaveformAnd the standardWaveformThe phase difference detection unit 22 calculates the phase difference between the two-dimensional coordinates and the correction unit 23 serving as a third correction unit corrects the two-dimensional coordinates obtained by the coordinate calculation unit 8 with the phase difference obtained by the phase difference detection unit 22. It may be. Thereby, detection accuracy can be further improved.
[0044]
  FIG. 10 conceptually shows an example of such processing. That is, the phase detector22Sought inWaveformAnd the standardWaveformTo find the phase difference Ф. FIG. 11 is a plan view showing the arrangement of the optical elements 5. The optical element 5 can also be realized by a single two-dimensional sensor. However, it is necessary to increase the resolution in order to increase the frequency resolution, and the circuit and peripheral devices become large. Therefore, as shown in FIG. 11, the optical element 5 is composed of two one-dimensional line sensors 5a and 5b arranged in the opening 24 so that the line directions are orthogonal to each other, and each output is one-dimensional. You may make it convert into a spatial frequency. Thereby, it is possible to reduce the cost while achieving high resolution. However, as shown in FIG. 11, each sensor 5a, 5b cannot be arranged at the center of the opening 24, and therefore, it is necessary to correct by the amount of deviation from the center.
[0045]
  FIG. 12 is a conceptual diagram of the writing pen 2. As shown in FIG. 12, the writing pen 2 may be provided with acceleration sensors 25a, 25b, and 25c that detect accelerations in the three-dimensional x-axis, y-axis, and z-axis directions.Yes.
[0046]
When a two-dimensional sensor is used as the optical element 5, if the opening for receiving light is square, the pattern of the specific paper 3 included in the opening as shown in FIG. The frequency distribution changes, resulting in malfunction. Therefore, if the opening is circular like the opening 24 shown in FIG. 11, the detection accuracy can be improved without being affected by the rotation of the axis of the writing pen 2.
[0047]
The specific paper 3 includes a reversible recording layer capable of reversibly recording information, and a support that supports the reversible recording layer. As a result, the written contents can be erased, and the specific sheet 3 can be reused.
[0048]
As the reversible recording layer, a thermal recording system, a magnetic recording system, a photochromic recording system, an electrochromic system, or the like can be used. In particular, a heat-sensitive recording method, that is, a method in which optical characteristics are reversibly changed by heat energy and visible information can be recorded and erased can be given as a preferable example. What can perform reversible recording by this thermal energy is composed of a recording layer containing at least a leuco dye and a developer, a resin layer containing organic low-molecular compound particles, and a recording layer containing a low-molecular or high-molecular liquid crystal compound. The reversible recording layer to be used can be mentioned as a preferable one.
[0049]
Examples of the reversible recording layer containing at least a leuco dye and a developer include those in which a leuco dye and a developer are dispersed in a resin binder.
[0050]
Examples of the leuco dye used in the reversible recording layer include known dye precursors such as phthalide compounds, azaphthalide compounds, fluoran compounds, phenothiazine compounds, and leucooramine compounds. Specifically, known leuco dyes described in JP-A-5-124360 can be used.
[0051]
The developer used for this reversible recording layer controls the cohesive force between molecules, such as phenolic hydroxyl groups, carboxylic acid groups, phosphate groups, etc., which have the ability to develop leuco dyes in the molecule. For example, a compound having a structure in which long-chain hydrocarbon groups are linked. The connecting part may be via 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, a known color developer described in JP-A-5-124360 can be used.
[0052]
This reversible recording layer is composed of a resin layer containing at least a leuco dye and a developer. Examples of the resin forming the recording layer include 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, Polyacrylic acid ester, polymethacrylic acid ester, (meth) acrylic acid ester copolymer, maleic acid copolymer, epoxy resin, alkyd resin, silicone resin, phenol resin, polyvinyl alcohol Lumpur, modified polyvinyl alcohol, polyvinyl pyrrolidone, polyethylene oxide, polypropylene oxide, methyl cellulose, ethyl cellulose, carboxymethyl cellulose, hydroxyethyl cellulose, starch, gelatin and casein, and the like.
[0053]
Various curing agents and cross-linking agents can be added for the purpose of increasing the strength of the recording layer film. 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. Further, a recording layer can be provided using an electron beam curable or ultraviolet curable binder. Examples of such a binder include a compound having an ethylenically unsaturated bond.
[0054]
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-based or diene-based compounds having a (meth) acryloyl group at the side chain or terminal
9. Monofunctional (meth) acrylate, vinyl pyrrolidone, (meth) acryloyl compound10. 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 its multimers
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. Polyargols 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. Examples thereof include multimers of the compounds described in 1 to 19 above, oligoester (meth) acrylate modified products, and the like.
[0055]
When a recording layer is formed using an ultraviolet curable binder, a photopolymerization initiator is mixed and used. Photopolymerization initiators include acetophenones such as di- or trichloroacetophenone, 1-hydroxycyclohexyl phenyl ketone, benzophenone, Michler's ketone, benzoin, benzoin alkyl ether, benzyldimethyl ketal, tetramethylthiuram monosulfide, thioxanthones, azo compounds, diaryls Examples include iodonium salts, triarylsulfonium salts, bis (trichloromethyl) triazine compounds, and the like.
[0056]
The reversible recording layer using these leuco dye and developer develops and decolors by the process shown in FIG. As shown in FIG. 15, when the initial decolored state (A) is heated, the leuco dye and the developer melt and mix at a temperature of T1 or higher (B), and when this state is rapidly cooled, the colored state remains fixed. (C). When the color development state (C) is heated, the color is erased at a temperature T2 lower than the color development temperature T1 (D).
[0057]
Further, the resin layer in which the reversible recording layer contains organic low molecular weight compound particles is a recording layer whose transparency reversibly changes depending on the temperature, and the light scattering property of the recording layer depends on the temperature. And reversibly changing properties.
[0058]
The resin used for the reversible recording layer 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. Polymers such as vinyl chloride copolymers; polyvinylidene chloride, vinylidene chloride-vinyl chloride copolymers, vinylidene chloride copolymers such as vinylidene chloride-acrylonitrile copolymers; polyesters; polyamides; polyacrylates, polymethacrylates or acrylates -Methacrylate copolymer; silicon resin and the like. These may be used alone or in admixture of two or more.
[0059]
As the organic low molecular weight compound used for the reversible recording medium, those having a melting point of 30 to 200 ° C., preferably about 50 to 150 ° C. are generally used. Such organic low molecular weight compounds include alkanols; alkane diols; halogen alkanols or halogen alkane diols; alkylamines; alkanes; alkenes; alkynes; halogen alkanes; 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 Their esters, amides or ammonium salts; thioalcohols; thiocarboxylic acids or their esters, amines or ammonium salts; 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.
[0060]
Furthermore, in order to widen the temperature range that can be made transparent, the above-mentioned organic low-molecular compounds may be appropriately combined, or such organic low-molecular compounds may be combined with other materials having different melting points. These are disclosed in, for example, Japanese Patent Application Laid-Open Nos. 63-39378 and 63-130380, Japanese Patent Application Nos. 63-14754 and 1-140109. However, it is not limited to these.
[0061]
The reversible recording layer composed of these organic low molecules and resin becomes transparent and cloudy by the process shown in FIG. FIG. 16 is a graph showing changes in transparency due to heat. In the figure, a reversible recording layer mainly composed of a resin and an organic low molecular weight compound dispersed in the resin is in a cloudy and opaque state at a room temperature of T0 or less, for example. When this is heated to a temperature T2, it becomes transparent, and it remains transparent even if it is returned to room temperature below T0 in this state. Further heating to a temperature of T3 or higher results in a semi-transparent state with maximum transparency and maximum opacity. Next, when the temperature is lowered, the first cloudy opaque state is restored without taking the transparent state again. When this opaque state is heated to a temperature between T1 and T2 and then cooled to room temperature, that is, a temperature equal to or lower than T0, the intermediate state between transparent and opaque can be taken. Further, the transparent material at room temperature is again heated to a temperature equal to or higher than T3 and then returned to room temperature to return to a cloudy and opaque state.
[0062]
Further, the reversible recording layer is used for a recording layer containing a low molecular weight or high molecular liquid crystal, and the high molecular liquid crystal includes a main chain type and a side chain in which a mesogen (a molecule exhibiting liquid crystallinity) is bonded to a main chain or a side chain. A chain molecular liquid crystal or the like is used. The polymer liquid crystal 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
Makromo1.Chem.179, p273 (1978), Eur, Po1y.J., 18, p651 (1982)
And Mo1.Cryst.Liq.Cryst., 169, p167 (1989). The polymer liquid crystal used in the embodiment of the present invention can also be produced by a similar method. Examples of mesogenic monomers and mesogenic compounds capable of addition reaction include biphenyl, phenylbenzoate, cyclohexylbenzene, azoxybenzene, azobenzene, azomethine, phenylpyrimidine, diphenylacetylene, biphenylbenzoate, cyclohexylbiphenyl, Representative compounds such as terphenyl-based rigid molecules (mesogens), preferably acrylate groups, methacrylate groups, or vinyl groups bonded via alkyl spacers of a predetermined length It is given as.
[0063]
Thus, when using a reversible recording material for a writing recording system, the above patterns can also be recorded on a reversible recording material. When electronic information is printed on a reversible recording material, the pattern is also recorded in the same device, so that the relative relationship between the print and the pattern is guaranteed by the relative positional accuracy of the writing means in one device. , The accuracy can be improved compared to the case of printing separately. If there is a gap between the pattern and the print, it will cause a shift between the handwriting and the print. Therefore, if the pattern is recorded on the reversible recording material and rewritten at the same time as printing, the accuracy between the printing and the pattern is guaranteed. In this case, the reversible recording material may be the same layer for printing and patterning, may be a different layer, or may be a different material. Using reversible material that is invisible only for the pattern improves handwriting recognition.
[0064]
The pattern may be irreversible printing. In this case, the print and writing locus written on the reversible layer can be rewritten any number of times, but the pattern is not affected by this. In other words, the pattern can be printed only once, and there is no need to incorporate a special mechanism.
[0065]
【The invention's effect】
In the invention described in claim 1, since the patterns do not cross each other, the detection sensitivity can be improved.
[0066]
According to the second aspect of the present invention, in the writing recording system according to the first aspect, since the influence of the rotation around the axis of the pen with respect to the obtained two-dimensional coordinates is eliminated, more natural writing can be performed.
[0067]
In the invention according to claim 3, in the writing recording system according to claim 1 or 2, since the influence of the tilt of the pen on the obtained two-dimensional coordinates can be eliminated, the detection accuracy can be further improved.
[0068]
In the invention according to claim 4, in the writing recording system according to claim 1 or 2, the influence of the tilt of the pen on the obtained two-dimensional coordinates can be eliminated, so that the detection accuracy can be further improved.
[0069]
According to the fifth aspect of the present invention, in the writing and recording system according to any one of the first to fourth aspects, the phase representing the change in the reflectance of the image is also taken into consideration, so that the detection accuracy can be further improved.
[0070]
In the writing recording system according to any one of the first to fifth aspects, the invention according to claim 6 can reduce the cost by using a one-dimensional line sensor as the optical element.
[0071]
  The invention according to claim 7 is the writing recording system according to any one of claims 1 to 6,The pattern can be made invisible so that it does not get in the way of writing.
[0072]
  The invention according to claim 8 is the first aspect.6In the writing recording system according to any one of the above, the pattern can be made invisible so as not to interfere with writing.
[0073]
  The invention according to claim 9 is the first aspect.8In the writing and recording system according to any one ofSince the opening is circular, it is difficult to be affected by the detection accuracy due to the posture of the writing pen, so that the detection accuracy can be further improved.
[0074]
  The invention according to claim 10 is the writing recording system according to any one of claims 1 to 9,Since the recorded object can erase the written contents, the recorded object can be reused.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an overall configuration of a writing recording system according to an embodiment of the present invention.
FIG. 2 is a functional block diagram showing a configuration example of a writing pen of the writing recording system.
FIG. 3 is a plan view showing a pattern attached to a specific sheet of the writing recording system.
FIG. 4 is a conceptual diagram of the writing pen provided with a gyro sensor.
FIG. 5 is a functional block diagram of the writing pen including the gyro sensor.
FIG. 6 is a conceptual diagram of the writing pen provided with an inclinometer.
FIG. 7 is a functional block diagram of the writing pen including the inclinometer.
FIG. 8 is a functional block diagram of the writing pen including the inclinometer.
FIG. 9 is a functional block diagram of the writing pen.
10 is an explanatory diagram of the operation of the functional block diagram of FIG. 9;
FIG. 11 is a plan view showing an arrangement of a one-dimensional line sensor forming an optical element of the writing pen.
FIG. 12 is a conceptual diagram of the writing pen provided with an acceleration sensor.
FIG. 13 is a functional block diagram of the writing pen including the acceleration sensor.
FIG. 14 is an explanatory diagram of the relationship between the shape of the opening for receiving light by the optical element of the writing pen and the frequency distribution of the pattern on the specific paper.
FIG. 15 is a graph illustrating a process in which a reversible recording layer using a leuco dye and a developer develops and decolors.
FIG. 16 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.
[Explanation of symbols]
1 Written recording system
2 Writing pen
3 Recorded objects
5 Optical elements
5a 1D line sensor
5b 1D line sensor
7 Frequency discrimination part
8 Coordinate calculation part
14 Rotation angle sensor
15 First correction unit
16 Tilt angle sensor
17 Second correction unit
18 Conversion unit
21 Phase converter
22 Phase difference detector
23 Third correction unit
25a Accelerometer
25b Acceleration sensor
25c acceleration sensor
26 Integration part

Claims (12)

In a writing recording system comprising a storage object and a writing pen,
The recording object is:
It consists of a pattern including a density pattern that can specify x-axis and y-axis coordinate values from a two-dimensional frequency distribution obtained by converting an image of a predetermined area.
The writing pen is
Imaging means for capturing an image of the predetermined area of the recording object;
A frequency discriminating means for converting the image picked up by the image pickup means into a frequency distribution in the x-axis direction and a frequency distribution in the y-axis direction;
From the frequency distribution in the x-axis direction converted by the frequency discriminating means, an x coordinate value is calculated,
Coordinate calculating means for calculating a y coordinate value from the frequency distribution in the y-axis direction converted by the frequency discriminating means,
Written recording system. The writing pen is
A rotation angle sensor for detecting a rotation angle about the axis of the writing pen;
Writing recording system according to claim 1, wherein the obtaining further Bei a, a first correction means for correcting by the rotation angle the x-coordinate value and the y coordinate value which has been determined by the coordinate calculation means. The writing pen is
An inclination angle sensor for detecting an inclination angle of the axis of the writing pen with respect to a recording object;
Writing recording system according to claim 1 or 2, wherein the obtaining further Bei and a second correction means for correcting the x-coordinate value and the y coordinate value in the tilt angle determined by the coordinate computing means . The writing pen is
An inclination angle sensor for detecting an inclination angle of the axis of the writing pen with respect to a recording object;
Prior to treatment with said frequency discriminator, and converting means for converting with the tilt angle of the image projected on a plane perpendicular to the image captured by the imaging means with the axis of said writing pen, writing recording system according to claim 1 or 2, wherein the obtaining further Bei a. The writing pen is
Waveform converting means for converting an image captured by the imaging means into a waveform representing a change in reflectance of the image;
A phase difference detecting means for obtaining a phase difference between the waveform converted by the waveform converting means and a reference waveform;
To one of claim 1, wherein the obtaining the third addition Bei correcting means, the correcting the x-coordinate value and the y coordinate value which has been determined by the coordinate calculation means in said phase difference Written recording system. The writing pen is
Further comprising a one-dimensional line sensor in the x-axis direction and the y-axis direction arranged so that the line directions are orthogonal to each other , photoelectrically converting the image captured by the imaging means into image information ;
The frequency discriminating means converts the frequency distribution in the x-axis direction from the image information photoelectrically converted by the one-dimensional line sensor in the x-axis direction, and photoelectrically converts the image by the one-dimensional line sensor in the y-axis direction. 6. The writing recording system according to claim 1, wherein information is converted into a frequency distribution in the y-axis direction . The recording object is:
The writing recording system according to claim 1, wherein the pattern is formed by a change in reflectance other than visible light. The recording object is:
Writing recording system according to one of any claims 1 to 6, wherein the motifs to be made of the emission intensity change in a region other than visible light when irradiated with energy ray, and wherein. The writing pen is
Writing recording system according to one of any claims 1 to 8, characterized in that the circular opening for the imaging means is received. The recording object is:
A reversible recording layer that allows reversible recording information, writing recording system according to one of any claims 1 to 9, wherein the obtaining Bei a support and supporting the reversible recording layer . In a writing pen constituting a coordinate detection system, together with a storage object including a pattern including a density pattern that can specify coordinate values of the x-axis and y-axis from a two-dimensional frequency distribution obtained by converting an image of a predetermined region,
  Imaging means for capturing an image of the predetermined area of the recording object;
  A frequency discriminating means for converting the image picked up by the image pickup means into a frequency distribution in the x-axis direction and a frequency distribution in the y-axis direction;
  From the frequency distribution in the x-axis direction converted by the frequency discriminating means, an x coordinate is calculated,
  Coordinate calculation means for calculating a y coordinate from the frequency distribution in the y-axis direction converted by the frequency discrimination means;
  A writing pen comprising: An imaging unit that captures an image of a predetermined region, a frequency discriminating unit that converts the image captured by the imaging unit into a frequency distribution in the x-axis direction and a frequency distribution in the y-axis direction, and the frequency discriminating unit. Coordinates together with a writing pen comprising: coordinate calculation means for calculating x coordinates from the frequency distribution in the x axis direction and calculating y coordinates from the frequency distribution in the y axis direction converted by the frequency discrimination means In the storage object constituting the detection system,
  A memory object comprising: a pattern including a density pattern capable of specifying x-axis and y-axis coordinate values from a two-dimensional frequency distribution obtained by converting an image of the predetermined region.

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