CN100411882C - Written media for handwritten information input systems - Google Patents

Abstract

The object of the present invention is to provide a writable medium for a handwritten information input system with unobtrusive dots and a handwritten information input device that can correctly read detection marks. Another object of the present invention is to provide a handwritten information input system having a writable medium and a handwritten information input device. The writable medium has an inconspicuous detection mark with few reading errors by the input device. The writable medium of the present invention prints small-sized dots containing infrared absorbing dye pigments on the surface of a sheet-like substrate. The color difference ΔE ^* _ab (pp) between the dot and the unprinted portion is 60 or less under visible light of 380 to 780 nm. The color difference ΔE ^* _ab (pp) was calculated from the measured value of the L ^* a ^* b ^* colorimetric system.

Description

Written media for handwritten information input systems

technical field

The present invention relates to a written-in medium for a handwritten information input system that converts the shape of a handwritten note on the written-in medium into digital information and records it using a handwritten-information input device for inputting handwritten characters into a computer or the like.

Background technique

In recent years, handwriting input systems for converting the shape of handwritten notes into digital data and recording them have been developed. For example, Japanese Patent Application Laid-Open No. 2003-500778 discloses a system including a paper having detection marks composed of countless dots printed on its surface, and a pen-shaped handwritten information input device capable of reading the detection marks. The detection mark is formed by arranging dots according to a predetermined rule, and absolute position information can be obtained by analyzing the arrangement rule of the detection mark. The handwritten information input device has a light source for reading, a sensor for acquiring a two-dimensional image of a detection mark, and a processor for analyzing the acquired detection mark and determining its position. The method of use is to move the handwritten information input device on the paper in the way of handwritten notes. The sensor of the handwritten information input device records detection marks that change simultaneously with the movement of the device at predetermined time intervals, and the processor analyzes the recorded detection marks and combines the analyzed data. Therefore, digital data on the movement locus of the handwritten information input device can be obtained. Since the handwritten information input device has the function of actually taking notes such as a pen, it is possible to create a file of notes and digital information of the contents of the notes at the same time.

Japanese PCT Publication No. 2003-503905 discloses a system for converting figures drawn on the paper into digital information using a handwritten information input device. In this system, when the handwritten information input device reads out the figure, it simultaneously reads out the detection marks around the figure. By analyzing the graphic data and the detection mark corresponding to the drawing position by a processor, the graphic shape and its drawing position can be converted into digital data. According to this method, one figure is read out multiple times to obtain multiple parts of figure data, and the plurality of figure data is combined by a processor to obtain the digital data of the original figure.

Japanese Patent Application Laid-Open No. 2003-508831 discloses a system corresponding to a form that repeatedly inserts and erases like a whiteboard. In one example of the invention, the system consists of a plastic sheet printed with detection marks and two detection mark reading devices. These can be installed on existing whiteboard sets for use. A plastic sheet is installed on the existing whiteboard, and a handwritten information input device is installed on the pen and the erasing device. In this system, by combining the content written by the stylus and the content erased by the erasing device, each write data can be separated into write data on other chips.

Japanese Patent Application Publication No. 2003-500777 discloses an application example of the system described in the aforementioned Japanese Patent Application Publication No. 2003-500778. On the order sheet printed with the detection mark, it is checked with a pen with a handwritten information input device, and the detection mark in the order frame is read out with the handwritten information input device. Based on the read data, digital information of ordered commodity data can be created.

Of course, these handwritten information input systems can output the shape of the note in real time, and can also read the shape of the note after the note is taken. In addition, since this system can wirelessly transmit digital data in the shape of a note to an external device, it is advantageous in that it does not require soft wiring and can flexibly respond to various forms of use.

In order to obtain accurate position information in this handwritten information input system, it is required to accurately read detection marks printed on a dedicated writing medium. Therefore, dots are printed on white series paper with black series ink such as black or dark blue, and the dot size is made larger.

However, due to the large color difference between the black series ink and the surface color of the paper, although it is easy to recognize the existence of dots, it makes the user feel uncomfortable. In addition, paper printed with many dots has an overall gray color that is too dense, and the appearance is poor. In addition, when printing detection marks on paper with exquisite patterns such as landscape paintings for anti-counterfeiting such as checks, traveler's checks, and certificates, or paper with design and decorative patterns such as cards and letter sets, the beauty of the pattern will be significantly damaged. There is a danger of appearance and style, and there is a problem that the reading system mistakenly recognizes the pattern as the detection mark, so that the reading of the detection mark is incorrect.

Furthermore, when the size of the dots becomes large, not only does the note taker feel a great sense of incongruity, but also the characters actually written on the paper overlap with the dots, making the written content difficult to read.

Contents of the invention

Therefore, it is an object of the present invention to provide a written medium for a handwritten information input system in which dots are not conspicuous and a detection mark can be accurately read by a handwritten information input device.

Another object of the present invention is to provide a handwritten information input system with a written medium and a handwritten information input device. Although the detection mark of the written medium of this handwritten information input system is not obvious, it can be read by the above-mentioned input device. There are very few mistakes.

In the medium to be written of the present invention, small-sized dots containing infrared absorbing dye pigments are printed on the surface of a sheet-like substrate. The color difference ΔE ^* _ab (pp) between the printed portion (dot) and the unprinted portion (base portion of the substrate) is 60 or less under visible light of 380 to 780 nm. The color difference ΔE ^* _ab (pp) was calculated from the measured value of the L ^* a ^* b ^* colorimetric system by the following mathematical formula (1).

${{\mathrm{<span\; class="notranslate">\; \&Delta;E</span>}}^{<span\; class="notranslate">\; *</span>}}_{\mathrm{<span\; class="notranslate">\; ab</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; p</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; p</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>\sqrt{{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; \&Delta;\; L</span>}}^{<span\; class="notranslate">\; *</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; p</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; p</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; \&Delta;a</span>}}^{<span\; class="notranslate">\; *</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; p</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; p</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; \&Delta;b</span>}}^{<span\; class="notranslate">\; *</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; p</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; p</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}$

Here, ΔE ^* _ab (pp) is the color difference between the printed part and the unprinted part, ΔL ^* _ab (pp) is the difference in lightness L ^* between the printed part and the unprinted part, and Δa ^* _ab (pp) is the difference between the printed part and the unprinted part The difference in chromaticity a ^* of the part, Δb ^* _ab (pp) is the difference in chromaticity b ^* of the printed and unprinted part. The color difference ΔE ^* _ab (pp) is suitable for estimating the difference in visually recognized colors, and the larger the color difference ΔE ^* _ab (pp), the larger the visually perceived color difference.

Therefore, the writable medium of the present invention, since the color difference ΔE ^* _ab (pp) between the printed part (dot) and the unprinted part under visible light is 60 or less, compared with the previous black series dots, the visual difference is poor. Not conspicuous, and the influence on the appearance of the paper can be reduced.

When the color difference ΔE ^* _ab (pp) between the printed part and the unprinted part exceeds 60, the existence of dots as the printed part is quite conspicuous, and the writer feels hesitant when writing characters, so it is not preferable. When the color difference ΔE ^* _ab (pp) is 60 or less, the dots formed by the ink are not bothersome, and the sense of discomfort felt by the writer becomes small.

When the color difference ΔE ^* _ab (pp) is 40 or less, the dots are hardly visible, and there is little sense of discomfort for the note taker, which is ideal. Furthermore, when the color difference ΔE ^* _ab (pp) is 20 or less, the dots are completely invisible, and the existence of the dots 12 cannot be recognized by the writer, and it is ideal because it can be used with the same feeling as ordinary paper. The most ideal color difference ΔE ^* _ab (pp) range is 10-20.

In the present invention, since the color difference ΔE ^* _ab (pp) between the printed portion and the non-printed portion is previously correlated with the sense of incongruity of the feeling that the actual printing point can be written on the medium, an appropriate color difference ΔE ^* _ab is determined (pp) range, so its advantage is that it can mechanically determine the selection of ink color for dot printing and the judgment of whether the ink color is suitable without being influenced by human subjectivity.

In addition, since the dots contain infrared-absorbing dyes and pigments, when the writeable medium is irradiated with infrared light, the infrared absorption amount of the dots and the infrared absorption amount of the unprinted part are greatly different, and the S/N ratio in the infrared region can be very high. . Therefore, the detection mark can be read out with high precision by using a sensor that captures a reflected image in the wavelength range.

In the present invention, the so-called point refers to a dot-shaped printed matter, and the specific shape when enlarged can be a shape composed of a circle, an ellipse, a polygon, a cross mark (×), a diagonal line (/), etc., or these shapes Various shapes such as combination shapes.

In the present invention, the so-called handwritten information input device refers to an entire device that converts characters and shapes written by hand on a rewritable medium into digital data and inputs them to an external device. The device includes at least a camera function unit for reading detection marks printed on the surface of a writable medium, a processor for analyzing the detection mark arrangement, and a communication unit for transmitting data. Furthermore, the handwritten information input device can be varied in various ways by adding other functions. For example, it includes a pen-type input device that has a pen function that can write characters, and an accessory-type input device that is used by attaching to an existing pen.

Description of drawings

Fig. 1 is a schematic front view of a writable medium for a handwritten information input system according to an embodiment of the present invention.

Fig. 2 is a schematic front view of a writable medium for a handwritten information input system according to another embodiment of the present invention.

Fig. 3 is a schematic diagram illustrating the interior of the handwritten information input device according to the embodiment of the present invention.

Detailed ways

The writable medium 11 of the present invention, as shown in FIG. 1 , has a plurality of dots 12 printed on the surface of a sheet-shaped substrate. A plurality of dots 12 are arranged according to a certain regularity, and form detection marks 14 . The dot 12 contains an infrared absorbing dye pigment, and the color difference ΔE ^* _ab (pp) between the dot 12 and the surface of the unprinted portion 15 is in the range of 60 or less under visible light of 380 to 780 nm.

The color difference ΔE ^* _ab (pp) is calculated using lightness L ^* and chroma a ^* , chroma b ^* represented by the L ^* a ^* b ^* colorimetric system (JISZ 8729). The so-called L ^* a ^* b ^* color system is a representation method of object color, which can be used to quantitatively express color performance. Lightness L ^* indicates that white becomes darker as it approaches 100, and black becomes darker as it approaches 0. Chromaticity a ^* means that the red becomes darker when the value increases in the positive direction, and the green becomes darker when the value increases in the negative direction. Chromaticity b ^* indicates that the yellow color becomes darker when the value increases in the positive direction, and the blue color becomes darker when the value increases in the negative direction. For example, the case of a ^* =-20, b ^* =20 is the color of the yellow-green system, the case of a ^* =20, b ^* =-20 is the color of the purple system, a ^* =-20, b ^* =-20 The case is the color of the blue-green system. In addition, the L ^* a ^* b ^* color expression system is consistent with the expression method of CIE LEB determined by CIE (International Commission on Illumination).

chromatic aberration ${{\mathrm{\&Delta;E}}^{*}}_{\mathrm{ab}}(p-p)=\sqrt{\mathrm{}}{\left({\mathrm{\&Delta;\; L}}^{*}(p-p)\right)}^2+{\left({\mathrm{\&Delta;a}}^{*}(p-p)\right)}^2+{\left({\mathrm{\&Delta;b}}^{*}(p-p)\right)}^2$ Take the points of two colors in the Lab color space coordinate system, and calculate the distance between these two points. The color difference ΔE ^* _ab (pp) is almost the same as the color difference of visual perception. Therefore, when the color difference ΔE ^* _ab (pp) between the dot 12 and the unprinted part 15 is quantified by the L ^* a ^* b ^* colorimetric system, it is possible to quantitatively define the note-taking effect (subjective) left and right by the original note-taker's sense of interest (subjective). The sense of incongruity experienced by the recipient due to the presence of dot 12 on the writable medium.

When the color difference ΔE ^* _ab (pp) exceeds 60, the point 12 is abnormally conspicuous, and it is not suitable because it feels hesitant to use as a writable medium. When the color difference ΔE ^* _ab (pp) is 60 or less, the writer is easy to use, when it is 40 or less, the writer can use it without feeling uncomfortable, and when it is in the range of 20 to 0, the writer can hardly recognize the existence of printing , can be used comfortably. Based on the user's visual sense of use, if an ideal color difference is set, then ΔE ^* _ab (pp) = 0 is the best. When using a colorless infrared absorbing dye pigment, it is also possible to make the color difference zero. Usually, however, it is clear that when the color difference ΔE ^* _ab (pp) of the coloring of the dot 12 is 10 or less due to the color of the infrared-absorbing pigment, the depth of the infrared-absorbing dye pigment in the dot 12 is too low. Therefore, for the actually used point 12, the color difference ΔE ^* _ab (pp) should be in the range of 10-20.

The dots 12 are printed with an IR-absorbing dye-pigment-containing ink containing a dye and/or pigment having IR-absorbing energy. When infrared light is irradiated on the writable medium 11, the infrared light is almost absorbed by the dots 12, and part or all of the unprinted portion 15 is reflected. Therefore, when an infrared image is taken on the surface of the writeable medium 11, the dots 12 are illuminated darkly because they absorb infrared rays, and other unprinted portions 15 are illuminated brightly by reflecting infrared rays.

The detection mark 14 of point 12 is calculated, and its position can be determined in one meaning. For example, according to the small arrangement of 5 points 12 in length and 5 in width, the absolute position on the paper can be known (refer to Japanese Special Table 2003-500777 Publication No. 2003-500778 and Special Form No. 2003-500778).

In addition, when using the print contrast signal (Print contrast signal_PCS) to evaluate the difference in infrared reflectivity between the dot 12 and the non-printed portion 15, the PCS when irradiated with near-infrared rays of 800-1000 nm is preferably 0.5-1. Here, PCS is defined by the following mathematical formula (2).

PCS=(reflectance of unprinted part-reflectance of dot)/(reflectance of unprinted part)...(2)

As indicated by the mathematical formula (2), PCS is a normalized value obtained by subtracting the difference in light reflectance of the unprinted portion and the dot from the reflectance of the unprinted portion, and the maximum value is 1. The closer the PCS value is to 1, the larger the difference in reflectivity between the unprinted portion 15 and the dot 12 is, and the more sensitively the handwritten information input device 1 can detect the dot 12 . On the other hand, when the PCS value is close to 0, the difference in reflectance between the unprinted portion 15 and the dot 12 becomes small, which may cause an error in reading the dot 12 by the handwritten information input device 1 .

The maximum wavelength of the light emitting unit 9 of the generally used handwritten information input device 1 is about 800 to 1000 nm, and the imaging element 10 can detect the dot 12 with high sensitivity in this wavelength range. Therefore, the PCS specifying this wavelength is effective. The absorptivity of the point 12 in this wavelength region is 100% (PCS=1), which is ideal because a high S/N ratio can be obtained.

However, in practice, it is almost impossible to achieve PCS=1 for the absorption rate at the point 12, so the range of PCS=0.5 to 1 is ideal. If the PCS is less than 0.5, it is difficult for the imaging device 10 to recognize the dot 12 sufficiently, which may cause a readout error, which is not preferable.

Originally, the color difference ΔE ^* _ab (pp) has no direct relationship with PCS. However, infrared absorbing dyes and pigments are usually colored, and when the PCS increases due to an increase in the content of the infrared absorbing dyes and pigments, the color difference tends to increase. In the case of commonly used infrared absorbing dyes and pigments, it is clear that when the color difference ΔE ^* _ab (pp) is 10 or more, an ideal PCS value can be obtained.

When the base of the writeable medium 11 is white or yellowish white such as white, beige, off-white, milky white, etc., the infrared reflectance of the unprinted portion 15 increases, so the S/N ratio of the dot 12 increases, which is ideal.

Although any color can be used for the color of point 12, especially the ink containing white, yellow or green series dyes and pigments is ideal because it gives a good visual impression and can reduce the sense of incongruity when used.

It is preferable that the color difference ΔE ^* _ab (pb) between the color of the dot 12 and the color of the writing portion with a pen is 50 or more. The color difference ΔE ^* _ab (pb) is better than 60. The color difference ΔE ^* _ab (pb) between the dot and the writing part of the pen is calculated by the following mathematical formula (3) from the measured value of the L ^* a ^* b ^* colorimetric series.

${{\mathrm{<span\; class="notranslate">\; \&Delta;E</span>}}^{<span\; class="notranslate">\; *</span>}}_{\mathrm{<span\; class="notranslate">\; ab</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; p</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; b</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>\sqrt{{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; \&Delta;\; L</span>}}^{<span\; class="notranslate">\; *</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; p</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; b</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; \&Delta;a</span>}}^{<span\; class="notranslate">\; *</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; p</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; b</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; \&Delta;b</span>}}^{<span\; class="notranslate">\; *</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; p</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; b</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}$

Here, ΔL ^* _ab (pb) is the color difference of the luminance L ^* of the dot and the writing portion of the pen, Δa ^* _ab (pb) is the difference of the chromaticity a ^* of the dot and the writing portion of the pen, and Δb ^* _ab (pb) is The difference in chromaticity b ^* of the dot and the note portion of the pen. The color difference ΔE ^* _ab (pb) is suitable for estimating the difference in visually recognized colors, and the larger the color difference ΔE ^* _ab (pb), the larger the difference in visual perception.

When the color difference ΔE ^* _ab (pb) between the dot and the writing part of the pen is 50 or less, it is not good because the dot 12 and the writing on the writing cannot be distinguished correctly. On the other hand, when the color difference ΔE ^* _ab (pb) between the writing portion with the pen and the dot 12 is 50 or more, more preferably 60 or more, the writing with the pen is conspicuous and can be read correctly.

Specific examples of infrared absorbing dyes and pigments include dyes and pigments that are organometallic complexes of phthalo series, cyanine series, phthalocyanine series, and naphthalocyanine series. Since these dyes and pigments have excellent infrared absorption ability, inks containing these dyes and pigments can obtain a sufficient S/N ratio even when they are diluted and printed. Therefore, the usage amount of the infrared absorbing dye and pigment can be reduced, which is beneficial to reduce the production cost of the writable medium 11 . In addition, even when the writable medium 11 is somewhat contaminated, it is advantageous because the detection sensitivity of the handwritten information input device can be maintained well. Compared with pigments, dyes have less ink impurity deposits attached to the nib, and less clogging of the nib.

Point 12. The appropriate concentration of the infrared absorbing dye or pigment contained in the printing ink varies depending on the type of the dye or pigment to be used, but generally, it is preferably in the range of 0.1 to 10% by weight. When the concentration is less than 0.1% by weight, it is difficult to obtain a sufficient S/N ratio due to excessive dilution. As the concentration of the dye pigment increases, the S/N ratio increases, but at 10% by weight the S/N ratio is almost saturated and does not change substantially. Therefore, when the concentration is more than 10% by weight, it is not preferable because the color difference increases and the cost of the ink increases.

Examples of the method for forming the dots 12 include various printing methods such as offset printing, screen printing, and inkjet printing.

The substrate can utilize high-quality paper, recycled paper and flexible polymer film. Premium and recycled papers are suitable for notebooks, reports, cards, recording paper, and other paper. The polymer film is suitable, for example, to be installed on the surface of an existing white board and used as an electronic white board. Polymer films can be made of polyvinyl chloride, polyethylene terephthalate, and silicone rubber.

It is convenient to form a better printed portion 13 when measuring the lightness L ^* , chroma a ^* , and chroma b ^* of the point 12. Usually, the size of the dot 12 is about 100 μm, and even if the color tone of such a small dot 12 is measured, the measurement is substantially performed on the unprinted portion 15 where the dot 12 is printed. Therefore, using the same ink as that used for printing the dots 12 and printing the better printed portion 13 with the same thickness as the ink thickness of the dots 12, it can be used to measure the brightness and chroma of the dots 12. Preferably, the printing portion 13 has a size that can be measured by a colorimeter. Preferably, the printing part 13 is mainly used to determine the brightness and chroma of the dot 12. Therefore, the ink tone and ink thickness of the dot 12 have been determined, and based on this, it is not necessary to form a Preferably printing section 13.

Dots 12 are formed at detection marks 14 for indicating positions on the medium 11 that can be written. In detail, as shown in FIG. 1 , detection marks 14 in which a plurality of independent dots 12 are arranged are dispersedly formed on the surface of the substrate within a range where writing can be written. The detection marks 14 are arranged according to predetermined rules, and the positions (coordinates) on the writable medium 11 are specified according to the positional relationship of the plurality of points 12 .

As a specific example of the detection mark 14 of the dot 12, a so-called Anot pattern according to the standard of Anot company can be mentioned. If this detection mark is adopted, not only the position information on the medium 11 that can be written on the front, but also the page information of the paper itself can be detected using the handwritten information input device. In addition, in FIG. 1 , although the dots 12 constituting the detection mark 14 are arranged in a matrix, this is a schematic representation of an Anot pattern, and the actual detection mark is somewhat different from this.

The writable medium 11 in FIG. 2 is a writable film 11 formed by laminating an infrared reflective film 17 on the back of a transparent or translucent polymer film. Dots 12 printed with ink containing an infrared absorbing dye pigment are formed on the surface of the polymer film. Infrared reflective film can utilize non-absorbing infrared rays with a wavelength of 730-1100nm. Specific examples include infrared-cutting films that are pasted on window panes, automobile windshields, and the like. On the rewritable film 11 having the infrared reflective film 17, the unprinted portion 15 without the printed dots 12 can increase the PCS value by utilizing the infrared reflective film 17 on the back thereof to have infrared reflective performance.

The pen-type handwritten information input device 1 shown in FIG. 3 is a device for reading a point 12 that can be written on a medium 11 and determining its position. The handwritten information input device 1 has a pen unit 2 for writing, a camera function unit 4 , a processor 5 and a memory 6 in a pen-shaped casing.

The pen portion 2 has a nib and black series ink, etc., and the pen portion 2 capable of writing notes on the surface of the writable medium 11 includes a ballpoint pen, a felt pen, a fountain pen, and the like. The so-called black series inks include not only black, but also dark blue series inks. When the L ^* a ^* b ^* color series is used to represent the note part written by the black series ink, it can be considered that the color space range specified by the lightness L ^* 24-27, a ^* 2-10, b ^* -0.1-6 Inside.

The maximum absorption wavelength of the dye of the pen ink and the maximum absorption wavelength of the infrared-absorbing dye pigment of the detection mark preferably have a difference of at least 80 nm or more. When the difference between these maximum absorption wavelengths is 80 nm or less, the contents of the pen note and the dot 12 are confused, and reading errors and reading errors of the detection marks 14 are likely to occur, which is not preferable. Furthermore, the pen unit 2 may have a pressure sensor (not shown) for detecting the writing pressure.

The camera function unit 4 includes a light emitting unit 9 composed of an LED that irradiates light on the writable medium 11 , and an imaging element 10 such as a CCD and a CMOS sensor that captures an image of the writable medium 11 . When the note can be written into the medium 11, through the opening 3 of the front end opening of the handwritten information input device 1, a plurality of points 12 located at the pen tip periphery of the pen part 2 are irradiated by the light emitting part 9, and are detected by the imaging element 10. for photography.

The light emitting unit 9 of the present invention uses a light emitting element capable of emitting light including an infrared component, and the imaging element 10 uses an element capable of capturing an infrared image. The wavelength difference between the maximum wavelength of the light-emitting portion 9 and the characteristic maximum absorption wavelength of the infrared-absorbing dye pigment included in the dot portion is preferably within 80 nm. If the wavelength difference is more than 80 nm, the detection accuracy of the handwritten information input device will remarkably drop, which is not preferable.

The processor 5 analyzes the image data of the dot 12 sent from the camera function unit 4 . Specifically, the processor 5 performs binary coding on the image data sent from the camera function unit 4 to recognize the position of the dot 12 based on the absorption level of infrared rays. At the same time, by analyzing the arrangement of the photographed points 12, the absolute position of the pen tip is determined, and the shape of the written characters and graphics is determined according to the change of the position of the pen tip over time. Through such processing by the processor 5, the handwriting information can be converted into digital data. By adding the information from the pressure sensor of the pen part 2 to the information on the position change of the pen tip, digital data of characters and figures with a handwriting feel can be obtained.

Digital data from processor 5 is stored in memory 6 . The digital data is finally transmitted to an external device and used for reproduction of the shape of the note, data for handwriting authentication, and the like. In FIG. 2, data is transmitted from the communication unit 7 to an external device by wireless means such as radio waves and infrared rays. For example, the handwritten information input device 1 using a Bluetooth radio can be used in the communication unit 7 . However, data transmission is not limited to wireless but also wired. External machines receiving data include portable information terminals (PDAs), computers, and mobile phones.

The battery 8 supplies power necessary for the camera function unit 4, the processor 5, the memory 6, the communication unit 7, and the like. As the battery 8, for example, a small lithium-ion battery can be used.

As a specific example of the handwritten information input device, a digital pen developed by Anot Corporation of Sweden can be cited.

Example

Examples are given below to describe the present invention more specifically. However, the present invention is not limited to these Examples.

Embodiment 1 (can be written on paper)

Into the near-infrared absorption organic pigment of the phthalocyanine metal oxide complex (YKR-5010, manufactured by Yamamoto Kasei Co., Ltd.), add an oxidative polymerization-type printing resin (Bestowon GIGA Mage M, manufactured by T&KTOKA Co., Ltd.), and adjust the pigment concentration to 5% by weight to make oxidative polymerization ink. Using this ink, on A4-size white high-quality paper and recycled paper, offset printing dots 12 and better printing portions 13 are made into writable paper 11 as a writable medium. Mark the point 12 detection according to the arrangement specified by Anot Corporation. Preferably, the printing section 13 is formed in a blank portion on the surface of high-quality paper and recycled paper with a size of 2 cm x 2 cm. The ink thickness of the dots 12 and preferably the printed portion 13 is about 1 μm. The characteristic absorption maximum of YKR-5010 is 900nm.

Example 2

Add an oxidative polymerization-type printing resin (Bestowon GIGA Mage M) to a near-infrared-absorbing organic pigment of a naphthalocyanine metal oxide complex (NC-232, manufactured by Sanyo Color Co., Ltd.), and adjust the pigment concentration to 3 wt. %, made into oxidative polymerization ink. Using this ink, on high-quality paper and recycled paper, as in Example 1, offset printing dots 12 and better printing portions 13 were used to prepare paper 11 capable of being written on. The characteristic absorption maximum of NC-232 is 860 nm.

Example 3

Oxidative polymerization-type printing resin (Bestowan GIGA Mage M) was added to a near-infrared-absorbing organic dye of a cyanine metal oxide complex (YKR-3070, manufactured by Yamamoto Chemical Co., Ltd.) to adjust the pigment concentration to 8% by weight to prepare Into oxidative polymerization ink. Using this ink, on high-quality paper and recycled paper, as in Example 1, offset printing dots 12 and better printing portions 13 were used to prepare paper 11 capable of being written on. The characteristic absorption maximum of YKR-3070 is 850nm.

Example 4

Add an oxidative polymerization type printing resin (Bestowon GIGA Mage M) to a near-infrared-absorbing organic dye of a phthalometal oxide complex (YKR-2900, manufactured by Yamamoto Kasei Co., Ltd.), and adjust the pigment concentration to 1% by weight to prepare Into oxidative polymerization ink. Using this ink, on high-quality paper and recycled paper, as in Example 1, offset printing dots 12 and better printing portions 13 were used to prepare paper 11 capable of being written on. The characteristic absorption maximum of YKR-2900 is 800nm.

Example 5

Disperse the near-infrared absorbing organic pigment (YKR-5010) and varnish with two rollers, add UV-curable printing resin (Mejium S, manufactured by T&K TOKA Co., Ltd.), and adjust the pigment concentration to 1.3% by weight to prepare UV-curable ink . Using this ink, on high-quality paper, recycled paper, and beige paper, the same as in Example 1, offset printing dots 12 and better printing portions 13, and made paper 11 that can be written on.

Example 6

The near-infrared absorbing organic dye (YKR-2900) and varnish were dispersed with two rolls, and then UV curable printing resin (Mejium S) was added to adjust the pigment concentration to 0.3% by weight to prepare a UV curable ink. Using this ink, on high-quality paper, recycled paper, and beige paper, the same as in Example 1, offset printing dots 12 and better printing portions 13, and made paper 11 that can be written on.

Example 7

A near-infrared-absorbing organic dye (UVR-01, manufactured by Nippon Cores Co., Ltd.) was dispersed in toluene, and a UV-curable printing resin (Medium S) was added to adjust the dye concentration to 20% by weight to prepare a UV-curable ink. Using this ink, on high-quality paper, recycled paper, and beige paper, the same as in Example 1, offset printing dots 12 and better printing portions 13, and made paper 11 that can be written on. The absorption maximum characteristic of UVR-01 is 850 nm.

Embodiment 8 (film that can be written)

Add UV-curable printing resin (Majium 161S, manufactured by T&K TOKA) to the near-infrared absorbing organic pigment used in Example 1 (YKR-5010, manufactured by Yamamoto Chemical Co., Ltd.), and adjust the pigment concentration to 3% by weight to obtain a UV hardening ink. Using this ink, offset printing dots 12 and preferred printing portions 13 were printed on a white film made of polyvinyl chloride. Arrange the dots 12 according to the arrangement specified by アノト company. Preferably, the printed portion 13 is formed in a blank portion on the surface of the white film with a size of 2 cm×2 cm. The ink thickness of the dots 12 and preferably the printed portion 13 is about 1 μm. After printing, irradiate the dots 12 and the preferred printing portion 13 with ultraviolet light from a UV lamp (USHIO Corporation, UVH-800H, wavelength 255nm) to harden the ink and make a writable film 11 as a writable medium. . This film was cut into length 80 cm x width 130 cm.

Example 9

The near-infrared absorbing organic pigment (YKR-5010) and varnish were dispersed with two rollers, and then UV curable printing resin (Mejium S) was added to adjust the pigment concentration to 1.3% by weight to prepare a UV curable ink. Using this ink, on a colorless transparent film made of polyvinyl chloride, offset printing dots 12 and preferred printing portions 13 were carried out in the same manner as in Example 8. Then, the printed part is hardened by ultraviolet irradiation. Then, an infrared cutoff film (manufactured by Reiblox Spittrain) formed with an infrared reflective metal coating on a transparent polyethylene film was bonded to the back of the printed film to obtain a writeable film 11 .

Example 10

A near-infrared-absorbing organic dye (UR-01HM, manufactured by Nippon Cores Co., Ltd.) was dispersed in toluene, and a UV-curable printing resin (Medium S) was added to adjust the dye concentration to 20% by weight to prepare a UV-curable ink. Using this ink, on a colorless transparent film made of polyvinyl chloride, offset printing dots 12 and preferred printing portions 13 were carried out in the same manner as in Example 8. Then, the printed part is hardened by ultraviolet irradiation. Further, an infrared cut film (manufactured by Reiblox Spittrain) was bonded to the back of the printed film to obtain a writeable film 11 . The characteristic absorption maximum of near-infrared absorbing organic dyes is 850 nm.

Example 11

The near-infrared absorbing organic pigment (YKR-5010) and varnish were dispersed with two rolls, and then UV curable printing resin (Mejium S) was added to adjust the pigment concentration to 2.5% by weight to prepare a UV curable ink. Using this ink, on a white film made of polyvinyl chloride (manufactured by Kaitekoshi Toaikeshi Co., Ltd.), the printing dots 12 and the preferred printing portion 13 were offset-printed in the same manner as in Example 8. Then, the printed portion is cured by ultraviolet irradiation to form a writeable film 11 .

Example 12

In the ink of Example 11, the pigment concentration of the near-infrared absorbing organic pigment (YKR-5010) was changed from 2.5% by weight to 5% by weight to obtain a UV curable ink. Using this ink, on a colorless transparent film made of polyvinyl chloride, offset printing dots 12 and preferred printing portions 13 were carried out in the same manner as in Example 8. Then, the printed part is hardened by ultraviolet irradiation. Then, an infrared blocking film (reibrox) is bonded to the back of the printed film to obtain a writeable film 11 .

Example 13

In the ink of Example 11, the pigment concentration of the near-infrared absorbing organic pigment (YKR-5010) was changed from 2.5% by weight to 10% by weight to obtain a UV curable ink. Using this ink, on a colorless transparent film made of polyvinyl chloride, offset printing dots 12 and preferred printing portions 13 were carried out in the same manner as in Example 8. Then, the printed part is hardened by ultraviolet irradiation. Then, an infrared blocking film (reibrox) is bonded to the back of the printed film to obtain a writeable film 11 .

Embodiment 14 (pen type input device for film writing)

As the handwritten information input device shown in Fig. 3, use the camera portion (parts No.965102-0100-2 of the personal digital pen of the company of Roujitec of the U.S., the maximum wavelength of light-emitting portion 850nm) that uses, as this pen portion 2 used Ink, a near-infrared absorbing dye (800NP, manufactured by AVECI Corporation) having a maximum absorption wavelength of 730 nm was dispersed in isopropanol to prepare a pen ink having a dye concentration of 50% by weight.

Comparative example 1. (Can be written on paper)

Using a black oxidative polymerization type offset printing ink called a general "ink" (Subba-TEKPLUS Ink M, manufactured by T&K, TOKA Co., Ltd.), 12 offset printing dots were printed on high-quality paper and recycled paper in the same manner as in Example 1. And preferably the printing section 13 is made to be written on the paper 11 .

Comparative example 2.

A UV curable printing resin (Medium 161S) was added to an organic pigment (BX132, manufactured by Dainippon Ink Chemical Co., Ltd.) to adjust the pigment concentration to 10% by weight to prepare a UV curable ink. Using this ink as in Example 1, offset printing dots 12 and better printing portions 13 are made on high-quality paper and recycled paper to make paper 11 that can be written on. The absorption maximum characteristic of BX132 is 700 nm.

Comparative example 3.

To the near-infrared-absorbing organic pigment of phthalocyanine metal oxide complex used in Example 1 (YKR-5010, manufactured by Yamamoto Kasei Co., Ltd.), an oxidative polymerization-type printing resin (Bestowon GIGA Mage M, manufactured by T&K TOKA Co., Ltd.) was added. ), adjust the pigment concentration to be 12% by weight, and make oxidative polymerization ink. Using this ink as in Example 1, offset printing dots 12 and better printing portions 13 are made on high-quality paper and recycled paper to make paper 11 that can be written on.

Comparative example 4.

The organic pigment (BX132) and varnish were dispersed with two rolls, and then UV curable printing resin (Medium S) was added to adjust the pigment concentration to 10% by weight to prepare a UV curable ink. Using this ink, on high-quality paper, recycled paper, and beige paper, offset printing dots 12 and better printing portions 13 were made in the same manner as in Example 1 to produce writeable paper 11.

Comparative example 5.

In the ink of Comparative Example 4, the concentration of the organic pigment (BX132) was changed from 10% by weight to 1% by weight to prepare a UV curable ink. Using this ink, on high-quality paper, recycled paper, and beige paper, offset printing dots 12 and better printing portions 13 were made in the same manner as in Example 1 to produce writeable paper 11.

Comparative example 6.

Offset printing was carried out in the same manner as in Example 1 on high-quality paper, recycled paper, and beige paper using a black UV-curable offset printing ink (F·Dikaruton P ink mouth, manufactured by Toyo Ink Co., Ltd.) called a general "ink". The dots 12 and preferably the printed portion 13 are made to be written on the paper 11 .

Comparative example 7. (Writable thin film)

Using a black UV-curable offset printing ink (UV161 ink S, manufactured by T&K, TOKA), on a white film made of polyvinyl chloride, the offset printing dots 12 and the preferred printing portion 13 were printed in the same manner as in Example 8. Then, the printed portion is cured by irradiation with ultraviolet rays to produce writeable paper 11 .

Comparative example 8.

The near-infrared absorbing organic pigment (YKR-5010) and varnish were dispersed with two rolls, and then UV curable printing resin (Mejium S) was added to adjust the pigment concentration to 1.3% by weight to prepare UV curable ink. Using this ink, on a colorless transparent film made of polyvinyl chloride, offset printing dots 12 and preferred printing portions 13 were carried out in the same manner as in Example 8. Then, the printed portion is cured by irradiation with ultraviolet rays to produce writeable paper 11 .

Comparative example 9.

Using a black UV-curable offset printing ink (F·D Calton P ink port), on a colorless transparent film made of polyvinyl chloride, the offset printing dots 12 and the preferred printing portion 13 were printed in the same manner as in Example 8. Then, the printed part is hardened by ultraviolet irradiation. On the back of the printed film, an infrared ray blocking film (reibrock) is bonded to form a writeable film 11 .

Comparative example 10.

The near-infrared absorbing organic pigment (YKR-5010) and varnish were dispersed with two rolls, and then UV curable printing resin (Mejium S) was added to adjust the pigment concentration to 1.3% by weight to prepare UV curable ink. Using this ink, on a colorless transparent film made of polyvinyl chloride, offset printing dots 12 and preferred printing portions 13 were carried out in the same manner as in Example 8. Then, the printed part is hardened by ultraviolet irradiation. Then, on the back surface of the printed film, an infrared ray blocking film (reibroku) formed on a transparent polyethylene film with an infrared reflective metal coating was bonded to form a writeable film 11 .

Comparative example 11.

A UV curable ink was prepared by mixing 80% by weight of the UV curable offset printing ink (F·D Carlton P ink port) of Comparative Example 9 and 20% by weight of the UV curable printing resin (Medium S). Using this ink, on a colorless transparent film made of polyvinyl chloride, offset printing dots 12 and preferred printing portions 13 were carried out in the same manner as in Example 8. Then, the printed part is hardened by ultraviolet irradiation. Further, an infrared cut film (manufactured by Ray Flux Spectrain Co., Ltd.) was bonded to the back surface of the printed film to obtain a writeable film 11 .

Comparative example 12.

Using a black UV curable offset printing ink (ink for ニ_ユタイイキ_ユア BF-Zfratsushiyu, manufactured by Dainippon Ink Chemical Industry Co., Ltd.), on a colorless transparent film made of polyvinyl chloride, offset printing was carried out in the same manner as in Example 8. Printed dots 12 and better printed sections 13. Then, the printed part is hardened by ultraviolet irradiation. On the back of the printed film, an infrared cut film (Ray Flux) is bonded to form a writeable film 11 .

Comparative Example 13. (Pen Type Input Device for Film Writing)

As the handwritten information input device shown in Fig. 3, use the camera part (parts No.965102-0100-2 of the personal digital pen of American Roujitec company manufacture, the maximum wavelength of light-emitting part is 850nm), use as this pen part 2 A near-infrared absorbing dye (YKR-2900) with a maximum wavelength of 850 nm was dispersed in isopropanol to prepare a pen ink with a dye concentration of 50% by weight.

The color tone (brightness L ^*, chroma a ^* , chroma b ^* ) of the obtained writeable paper and film was measured with a color difference meter color-guide manufactured by BKY-Gardner GmbH in Germany. In the tone measurement, the better printed portion 13 and the unprinted portion 15, ie, the surface portion of paper and film, are measured. Table 1 shows the measurement results of writable paper using white high-quality paper, Table 2 shows the measurement results of writable paper using recycled paper, and Table 3 shows the measurement results of writable paper using beige paper As a result, Table 4 shows the measurement results of the writable film using the polyvinyl chloride film.

Table 1 High-quality paper

Table 2 recycled paper

Table 3 beige paper

Table 4 Films

Table 5 shows the color difference ΔE ^* _ab (pp) calculated from the measurement results in Tables 1-4, the visual visibility of the printed dots 12, and the feeling of strangeness.

The color difference ΔE ^* _ab (pp) of the writeable paper and film obtained in Examples 1 to 13 is 60 or less. In these Examples, the printed dots 12 were hardly visible, and there was almost no feeling of strangeness. On the contrary, the writable paper and film obtained in Comparative Examples 1 to 12 had a color difference ΔE ^* _ab (pp) exceeding 60. In these comparative examples, the point 12 is very remarkable, and the feeling of incongruity is also strong. In this way, it can be understood that if the color difference ΔE ^* _ab (pp) between the dot 12 and the unprinted part 15 is below 60, the obtained writable paper and film can provide a comfortable feeling of use, and when the color difference exceeds 60, use Sometimes there is a sense of incongruity.

(continued on next page)

Table 5 Color difference ΔE ^* _ab (pp) and whether the point is suitable

points of evaluation

○: Little or no sense of incongruity

×: Indicates a sense of incongruity

PCS of the writeable paper and film obtained in Examples 1 to 3 and 8 and Comparative Examples 1 to 3 and 7 were measured with a Digital Microscope (Digtal Micro Scope) (DMS910) manufactured by TECHKON GmbH in Germany. In addition, readout experiments were performed on these writable papers and films. In the reading test, as the handwritten information input device 1 , a digital pen (DP-101U, the maximum wavelength of the irradiated light of the light-emitting part is 850 nm) of Hitachi Maxell Co., Ltd. of Japan was used. The results are shown in Table 6.

Table 6PCS

High quality paper recycled paper film readout test Example 1 0.84 0.83 - ○ Example 2 0.78 0.76 - ○ Example 3 0.87 0.82 - ○ Example 4 0.65 0.65 - ○ Example 8 - - 0.88 ○ Comparative example 1 0.88 0.86 - ○ Comparative example 2 0.45 0.44 - × Comparative example 3 0.88 0.87 - ○ Comparative example 7 - - 0.88 ○

Evaluation of the readout test

○: The written characters and the like can be reliably read.

×: Characters and the like cannot be read.

From the results in Table 6, it can be seen that when the PCS is above 0.5, the handwritten information can be read well. On the contrary, when the PCS is less than 0.5, the reading fails.

Regarding the writable paper produced in Examples 5 to 7 and Comparative Examples 4 to 6, the visibility of characters written with a black pen was investigated. As a pen, a black ballpoint pen (N-5000) manufactured by Zeffra Co., Ltd. in Japan was used. The hue of the pen is lightness L ^* = 24.98, chroma a ^* = 9.18 and b ^* = -0.09. Table 7 shows the color difference ΔE ^* _ab (pb) obtained from the luminance chromaticity and the color tone of the dot printing ink. Furthermore, a readout test was also performed. As the handwritten information input device 1 for the reading test, a personal digital pen (part No. 965102-0100-2) manufactured by Roshitesoku Corporation of the United States was used, and the maximum wavelength from the light emitting part of the digital pen was 850 nm. Table 7 also shows the maximum absorption wavelength of the ink for dot printing, and the difference between this wavelength and the above-mentioned emission maximum wavelength.

Table 7

Color difference ΔE^*_ab(p-b) Visual recognition of text Pigment maximum absorption wavelength (nm) Wavelength difference (nm) readout test Example 5 66.3 ○ 850 ○ ○ Example 6 60.9 ○ 850 ○ ○ Example 7 56.2 ○ 850 ○ ○ Comparative example 4 33.3 × 700 100 △ Comparative Example 5 37.1 × 700 100 × Comparative example 6 12.8 × - - ○

Evaluation of visual recognition of text

○: The written characters and the like can be seen correctly.

X: Visual recognition of characters and the like is difficult.

Evaluation of the readout test

○: The written characters and the like can be reliably read.

△: Characters and the like could not be read in some cases.

(Sometimes the part produces errors)

×: Characters and the like cannot be read.

When the color difference ΔE ^* _ab (pb) between characters and dots is over 50, the written characters can be recognized correctly and completely. However, when the color difference ΔE ^* _ab (pb) is less than 50, it becomes difficult to recognize characters.

In addition, in Examples 5 to 7, the detection sensitivity using the detection mark 14 of the detection handwritten information input device 1 was good. On the contrary, the detection sensitivity of the detection marker 14 of Comparative Examples 4 to 6 was not good. This is because the wavelength difference between the maximum absorption wavelength of the ink for dot printing and the maximum wavelength of the light emitting part is greater than 100 nm.

With regard to the writable film 11 prepared in Examples 9 to 11 and Comparative Examples 8 to 10, a reading test of written characters was carried out using the pen type input device of Example 14 or Comparative Example 13. The readout test was performed twice. For the first time, characters are written on the writable film 11 that has not been written on, and it is checked whether the reading is good or not. For the second time, after erasing the content of the first note with an erasing tool, write the text. The results are shown in Table 8.

Table 8

Evaluation of the readout test

○: The written characters and the like can be reliably read.

×: Characters and the like cannot be read.

In the case of forming a writeable film with a transparent film, if the infrared reflective film is not provided on the back as in Comparative Example 8, the written characters cannot be identified and read by the pen-type input device, so it cannot be used as an information input system. . On the contrary, in Examples 9 and 10, and Comparative Examples 9 and 10, since the infrared reflective film is provided on the back side, it is possible to accurately identify and read the written characters. As described above, when infrared reflection energy is imparted to the unprinted portion 15 of the writable film 11 , the S/N ratio between the detection mark 14 and the unprinted portion 15 in the infrared region becomes good. Therefore, it was confirmed that the correct detection of the detection mark by the camera function section 4 of the pen-type input device and the correct identification and reading of the content of the memo were possible.

In addition, for Comparative Example 10, the second readout test was not suitable. This is because, because the absorption wavelength of the dot 12 constituting the detection mark is the same as the absorption wavelength of the pen ink, the camera function section 4 of the pen type input device cannot correctly judge the "ink ink" that occurs when erasing characters with the erasing tool. Stains and point 12.

Next, the influence of the color of the base paper of the writable medium of the present invention was investigated. Specifically, the ink of Example 5 (containing pigment), the ink of Example 7 (containing dye) and the black ink of Comparative Example 3 were respectively used on paper with three background colors of white, yellow, and blue series. A better printing portion 13 is formed on it. Table 9 shows the background color of each paper, i.e. the L ^* a ^* b ^* measured value of the unprinted portion 15, the L ^* a ^* b ^* measured value of the better printed portion 13 of each ink on each paper and the results obtained from these The color difference ΔE ^* _ab (pp) between the printed portion 13 and the non-printed portion 15 calculated from the measured value is preferable.

Table 9

As shown in Table 9, when printing with the inks of Examples 5 and 7, the ΔE ^* _ab (pp) of the white, yellow and blue papers were all less than 20-40, and the detection mark 14 was inconspicuous. In other words, the writable paper 11 of the present invention, even if white, yellow or blue paper is used as a base, the detection marks are not conspicuous, which can suppress the sense of incongruity felt by the writer. In contrast, when printing with the ink of Comparative Example 6, ΔE ^* _ab (pp) was greater than 70 regardless of the color of the paper, the detection mark was abnormally conspicuous, and the writer felt uncomfortable.

On the writable medium of the present invention, three types of black pens sold on the market were used on high-quality paper to make a good note section, and the L ^* a ^* b ^* was measured. The results are shown in Table 10. As the pens, N-5000 (pen 1) manufactured by Zebura Corporation, SA-13 (pen 2) manufactured by Mitsubishi Ballpoint Pen Corporation, and ecomate (pen 3) manufactured by Japan Pilot Corporation were used. In addition, the color difference ΔE ^* _ab (pb) of the better printing part 13 of Example 5, Example 7 and Comparative Example 6 and the better writing part of these three pens was calculated (Table 11).

Table 10 better notes section

L^* a^* b^* Pen 1 25.0 9.2 -0.01 Pen 2 26.4 2.9 4.8 Pen 3 25.4 3.1 5.4

Table 11 Color difference ΔE ^* _ab (pb)

Pen 1 Pen 2 Pen 3 Example 5 66.3 61.0 61.6 Example 7 56.2 51.0 51.5 Comparative example 6 12.8 12.4 11.9

According to Table 11, in the embodiments of Example 5 and Example 7, the characters written on the paper can be seen correctly and completely. This is because the color difference ΔE ^* _ab (pb) between the better printed part 13 and the better written part is 50 or more. In contrast, in the form of Comparative Example 6, the color difference ΔE ^* _ab (pb) was less than 12. In addition, in the form of Comparative Example 6, the detection mark 14 becomes an obstacle to vision, and it is difficult to recognize characters correctly.

With respect to the writable media of Examples 5, 7, and Comparative Example 6, 1000 m of writing was performed with a commercially available black ballpoint pen (manufactured by Super Grits 0.5mm Pylot Co., Ltd.), and the presence or absence of blurring was investigated. Specifically, four of these ballpoint pens were used for note taking, and it was investigated which of the ballpoint pens produced blurred characters after writing at 1000 m. The results are shown in Table 12.

Table 12

Among the 4 pieces, write the number of Feibai Example 5 3 sticks

Example 7 0 sticks Comparative example 6 2 sticks

From this result, it can be seen that in the form of Example 7 containing the dye, no blurring was seen at all even after writing at 1000 m. On the other hand, in the forms of Example 5 and Comparative Example 6 containing pigments, 3 and 2 ballpoint pens, respectively, were seen to have blurred writing. This is because, when the detection mark 14 is made of ink containing a pigment, the pigment clogs the tip of the ballpoint pen when writing with a ballpoint pen. Since the ballpoint pen is the most common tool for taking notes, when the dye is used as the infrared energy-absorbing material, there is no problem of blocking the nib of the ballpoint pen, which is practically advantageous.

Claims (11)

1. a hand-written information input unit is used is written into medium, uses in the hand-written information input unit that hand-written notes shape conversion can be become digital information, it is characterized in that,

The above-mentioned medium that are written into comprise sheet form base, be printed on this substrate surface set shape point and according to the certification mark of specific regularly arranged this point,

Above-mentioned point contains the infrared ray absorbing dye pigment,

The not aberration between the printing of the point of above-mentioned substrate surface and the not printing points of above-mentioned substrate surface is by following formula (1) regulation,

$\mathrm{\&Delta;}{E^{*}}_{\mathrm{ab}}(p-p)=\sqrt{{\left(\mathrm{\&Delta;}{L}^{*}(p-p)\right)}^2+{\left(\mathrm{\&Delta;}{a}^{*}(p-p)\right)}^2+{\left(\mathrm{\&Delta;}{b}^{*}(p-p)\right)}^2}---\left(1\right)$

In the formula, Δ E ^* _Ab(p-p) be the point and the aberration of printing not,

Δ L ^* _Ab(p-p) be the point and the brightness L of printing not ^*Poor,

Δ a ^* _Ab(p-p) be the point and the colourity a of printing not ^*Poor,

Δ b ^* _Ab(p-p) be the point and the colourity b of printing not ^*Poor,

Above-mentioned when being written into the visible light of media surface irradiation 380～780nm, the aberration Δ E that calculates ^* _Ab(p-p) be below 60.

2. the medium that are written into as claimed in claim 1 is characterized in that, above-mentioned aberration Δ E ^* _Ab(p-p) be below 40.

3. the medium that are written into as claimed in claim 1 is characterized in that, above-mentioned aberration Δ E ^* _Ab(p-p) be 10～20.

4. the medium that are written into as claimed in claim 1 is characterized in that, the print contrast signal-PCS of above-mentioned point and above-mentioned not printing is by following formula (2) regulation,

PCS=(not the reflectivity of printing-reflectivity)/(the not reflectivity of printing)

…(2)

To the above-mentioned near infrared ray that is written into media surface irradiation 800～1000nm the time, the PCS that calculates is in 0.5～1 scope.

5. the medium that are written into as claimed in claim 1 is characterized in that, above-mentioned infrared ray absorbing dye pigment be from phthalein series dyes pigment, cyanines series dyes pigment, phthalocyanine series dyes pigment, and the group that constitutes of naphthalene phthalocyanine series dyes pigment select.

6. the medium that are written into as claimed in claim 4 is characterized in that, above-mentioned infrared ray absorbing dye pigment be from phthalein series dyes pigment, cyanines series dyes pigment, phthalocyanine series dyes pigment, and the group that constitutes of naphthalene phthalocyanine series dyes pigment select.

7. the medium that are written into as claimed in claim 1 is characterized in that, the above-mentioned ink printing that contains resin by the above-mentioned infrared ray absorbing dye pigment that contains 0.1～10 weight % forms.

8. the medium that are written into as claimed in claim 4 is characterized in that, the above-mentioned ink printing that contains resin by the above-mentioned infrared ray absorbing dye pigment that contains 0.1～10 weight % forms.

9. as each described medium that are written into of claim 1 to 8, it is characterized in that above-mentioned substrate is any in good quality paper, recycled writing paper or the macromolecule membrane.

10. hand-written information input system, it comprises the hand-written information input unit that hand-written notes shape conversion can be become digital information, writes down the recording medium of above-mentioned digital information and utilizes the medium that are written into that this input unit uses, it is characterized in that,

The above-mentioned medium that are written into comprise sheet form base, be printed on this substrate surface set shape point and arrange the certification mark of this point according to ad hoc rules,

The above-mentioned some ink printing that contains the infrared ray absorbing dye pigment,

Aberration between above-mentioned point and the above-mentioned substrate surface is by following formula (1) regulation,

$\mathrm{\&Delta;}{E^{*}}_{\mathrm{ab}}(p-p)=\sqrt{{\left(\mathrm{\&Delta;}{L}^{*}(p-p)\right)}^2+{\left(\mathrm{\&Delta;}{a}^{*}(p-p)\right)}^2+{\left(\mathrm{\&Delta;}{b}^{*}(p-p)\right)}^2}---\left(1\right)$

In the formula, Δ E ^* _Ab(p-p) be the point and the aberration of printing not,

Δ L ^* _Ab(p-p) be the point and the brightness L of printing not ^*Poor,

Δ a ^* _Ab(p-p) be the point and the colourity a of printing not ^*Poor,

Δ b ^* _Ab(p-p) be the point and the colourity b of printing not ^*Poor,

To the above-mentioned visible light that is written into media surface irradiation 380～780nm the time, the aberration Δ E that calculates ^* _Ab(p-p) be below 60,

Above-mentioned hand-written information input unit has: the image mechanism that can make a video recording to an above-mentioned part that is written into the certification mark of medium, the part of this certification mark of dissection process is also made the parsing mechanism of resolution data and resolution data is transferred to the transport sector of recording medium.

11. hand-written information input system as claimed in claim 10 is characterized in that,

The print contrast signal PCS of above-mentioned above-mentioned point that is written into medium and above-mentioned not printing is by following formula (2) regulation,

PCS=(not the reflectivity of printing-reflectivity)/(the not reflectivity of printing)

…(2)

To the above-mentioned near infrared ray that is written into media surface irradiation 800～1000nm the time, the PCS that calculates is in 0.5～1 scope.

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