JP2008268585A - Pattern printing sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pattern printing sheet which is light in weight, can be mass-produced, has a low cost, facilitates enlargement of screen and, moreover, has a wide reading angle, with regard to a member for providing a coordinate detection means applicable for a data input system of such a type as to directly perform handwriting to a screen of a display device. <P>SOLUTION: The pattern printing sheet 1 is made by printing a non-visible light reflective transparent pattern 3 on the surface of a substrate 2, wherein an ink constituting the transparent pattern 3 includes a material that reflects non-visible light and the material that reflects the non-visible light is a retro reflective material. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a pattern printing sheet that is installed on the front surface of a medium that displays various image information and provides various information accompanying the image information. Especially, it is a member that provides coordinate detection means that can be suitably applied to a data input system for handwriting directly on the screen of a display device, and is particularly lightweight, mass-produced, inexpensive, and large in area. The present invention relates to a pattern printing sheet that is easy and has a wide reading angle and excellent reading performance.

In recent years, there has been an increasing need to convert handwritten characters, pictures, symbols, and the like into electronic data that can be handled by an information processing device. In particular, handwritten information can be processed in real time without passing through a reading device such as a scanner. There is an increasing demand for a method for inputting data to, etc.
Correspondingly, for example, input means provided with a pen for writing by hand and a writing surface, input locus reading means for reading an input locus at the time of handwriting input by the input means, and the input locus information as electronic data An input trajectory conversion means, and an input trajectory data transmission means for transmitting data converted by the input trajectory conversion means to an information processing apparatus, wherein the input trajectory reading means comprises: The mark that provides position information (coordinates) formed on the writing surface is read by a sensor installed on the pen, and the writing surface absorbs infrared rays as a mark that provides position information. A special paper on which a special dot pattern is printed, and an infrared irradiating unit for the pen to irradiate the writing surface with an infrared ray, and an infrared ray reflected by the dot pattern Writing type input device has been proposed which is provided with an infrared sensor for detecting a turn.
In addition, a pressure-sensitive sensor, electrostatic sensor, optical sensor, etc. are installed on the writing panel to detect writing pressure, static electricity, and shadow when handwritten with a stylus pen or finger on the panel surface. Thus, a write-type input device of a type that acquires an input locus has also been proposed.

However, in the former device, the handwritten content (input locus) can be converted into electronic data, but the direct input object is a dedicated sheet, and a separate display device is required to display the input locus information converted into electronic data. Become. By using a nib with graphite or ink so that the trace can be recorded on the paper, the trace information can be visually confirmed on the paper, but anyway, for example, handwriting input to the chart displayed on the display It is not suitable for intuitive and interactive operation, and requires a wider work space for input. In addition, when a locus is recorded on paper, paper that has been handwritten once cannot be used. Therefore, input paper that is a consumable needs to be prepared, and is not particularly suitable for mobile applications.
On the other hand, in the latter device, the panel to be written is provided with a pressure-sensitive sensor, an electrostatic sensor, and the like, so that it is difficult to reduce the size and weight and thickness of the input device compared to the former device. . Also, it is expensive in terms of cost. In addition, pressure-sensitive sensors and electrostatic sensors may malfunction when touched by hands or cuffs, and touch the side of the little finger side of the palm as when writing on a normal notebook. It becomes unsuitable for the writing method. Such a device can be installed on the front of the display using a transparent material for the writing panel, or by giving the writing panel itself a display function, for example, handwriting input to a chart displayed on the display. Intuitive and interactive operation is possible, but this method is expensive, so it is difficult to enlarge the screen, and it is difficult to reduce the size and weight, so it is not suitable for mobile applications such as mobile phones.

Therefore, in order to solve such a problem, it is possible to input directly handwritten content on the display surface of the display device to the information processing device, and the input device can be manufactured in a compact and inexpensive manner Was desired. In order to realize this, for example, in the former writing type input device, the paper on which the dot pattern as the writing means is printed is made transparent with respect to the light in the visible region, and the front of the display device or Install it on the front.
As a transparent sheet that satisfies such a requirement, for example, Patent Document 1 discloses a transparent sheet that is mounted on the front surface or the front of a display device, and indicates position information for indicating the position of an input locus by an input electronic pen or the like. Is printed using fluorescent ink that emits light that can be read by the input locus reading means when irradiated with light of a predetermined wavelength. However, Patent Document 1 does not describe the type of ink that embodies such a transparent sheet, merely describes the idea or desire of the transparent sheet, and specific examples of the sheet are as follows. Absent.
Further, Patent Document 2 discloses a coordinate input device using a transparent member printed with special ink that reflects an infrared region. However, Patent Document 2 also discloses a type of ink that embodies such a device. Are not described, only ideas or desires are described, and there are no specific examples of sheets.

In general, the lower layer of the liquid crystal layer has an alignment layer for aligning the liquid crystal. By applying an alignment process such as rubbing to the alignment layer, the cholesteric liquid crystal draws a beautiful spiral and has a spiral axis with respect to the substrate plane. Are aligned and oriented so that they are vertical. However, if the spiral axis is perpendicular to the substrate plane, only reading in the 0 ° (vertical) direction occurs when reading with a pen. When the position information is read with the electronic pen as described above, since various ways of holding the pen are assumed on the use side, the reading range with the pen should be wide, preferably 25 ° or more. .
Japanese Patent Laid-Open No. 2003-256137 JP-A-2001-243006

  The present invention has been made to solve the above-described problems, and can be suitably used for providing additional information to an image display medium, for example, directly inputting data by handwriting on a display device. An object of the present invention is to provide a pattern printing sheet that is lightweight, can be mass-produced, is inexpensive, can be easily increased in area, and has a wide reading angle.

As a result of intensive studies to achieve the above object, the present inventors have found that the above object can be achieved by using a retroreflective material as a material that reflects invisible light used for pattern formation. The present invention has been completed.
That is, the present invention is a material in which a transparent pattern having a non-visible light reflection property is printed on the surface of a substrate, and the ink constituting the transparent pattern includes a material that reflects the non-visible light, and the material that reflects the non-visible light. Provides a pattern printing sheet which is a retroreflective material.

  The pattern printing sheet of the present invention can be suitably used for providing additional information to an image display medium, for example, by handwriting directly on a display device and inputting the position coordinates of handwritten information. In addition to being able to reduce the work space, it is lightweight, can be mass-produced, inexpensive, easy to enlarge, and has a wide reading angle.

As shown in FIG. 1, the pattern printing sheet 1 of the present invention has a non-visible light reflective transparent pattern 3 printed on the surface of a substrate 2, and the ink constituting the transparent pattern 3 reflects invisible light. A material that includes a material and reflects the invisible light is a retroreflective material.
The invisible light is preferably infrared or ultraviolet. Infrared rays are preferably light in the near infrared region having a wavelength of 800 to 2500 nm, and infrared rays having a selective reflection peak wavelength at 800 to 950 nm are preferred. Moreover, as an ultraviolet-ray, it is preferable that it is an ultraviolet-ray which preferably has a selective reflection peak wavelength in 200-400 nm.

The retroreflective material contained in the ink constituting the non-visible light reflective transparent pattern (hereinafter also referred to simply as the transparent pattern) used in the present invention is such that minute high refractive glass beads acting as a lens satisfy a certain effect. Since each of the beads is a perfect circle and acts as a kind of convex lens, the incident light is refracted through the glass and focused on one point. This is a material that is provided with a reflective layer at the bottom and returned to the original light source direction after passing through the glass body again.
The average particle diameter of the glass beads in the retroreflective material used in the present invention is usually 1 to 50 μm and preferably 1 to 15 μm. Moreover, as a refractive index of the said glass bead, it is preferable in it being 1.4-2.4.
The amount of the retroreflective material contained in the ink constituting the transparent pattern is preferably 10 to 50% by weight. Furthermore, the amount of glass beads contained in the retroreflective material is preferably 5 to 60% by weight.

Examples of the binding resin in the retroreflective material used in the present invention include ionizing radiation curable resins, and examples of ionizing radiation curable resins include (meth) acrylate-based resins that are cured by ionizing radiation such as ultraviolet rays and electron beams. Polyfunctional compounds having functional groups, such as relatively low molecular weight polyester resins, polyether resins, acrylic resins, epoxy resins, urethane resins, alkyd resins, spiroacetal resins, polybutadiene resins, polythiol polyene resins, polyhydric alcohols, etc. (Meth) arylate oligomers or prepolymers and monomers, and specific examples thereof include monofunctional monomers such as ethyl (meth) acrylate, ethylhexyl (meth) acrylate, styrene, methylstyrene, and N-vinylpyrrolidone. And multifunctional monomers , For example, polymethylolpropane tri (meth) acrylate, hexanediol (meth) acrylate, tripropylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, pentaerythritol tri (meth) acrylate, dipentaerythritol hexa (meth) Examples include acrylate, 1,6-hexanediol di (meth) acrylate, neopentyl glycol di (meth) acrylate, and the like. Here, (meth) acrylate is a notation meaning acrylate or methacrylate.
In addition, a resin having a cationic polymerizable functional group such as an epoxy resin can be used.

  Moreover, when using an ultraviolet curable resin as said ionizing radiation curable resin, it is preferable to use a photoinitiator together. As specific examples of the photopolymerization initiator, for radical polymerizable resins such as (meth) acrylate, acetophenones, benzophenones, Michler benzoylbenzoate, α-amyloxime ester, tetramethylchuram monosulfide, Examples of thioxanthones and the like, and cationically polymerizable resins such as epoxy resins include aromatic iodonium salts, aromatic sulfonium salts, aromatic diazonium salts, metallocenes, and the like. Moreover, it is preferable to mix and use a photosensitizer, and specific examples thereof include n-butylamine, triethylamine, tri-n-butylphosphine and the like.

In the present invention, when printing a transparent pattern, it is preferable to use a coating solution in which a retroreflective material is dissolved in a solvent.
The solvent is not particularly limited as long as it has sufficient solubility in the material, and a known one may be used. For example, anone (cyclohexanone), cyclopentanone, toluene, acetone, MEK (methyl ethyl ketone), MIBK (methyl) Common solvents such as isobutyl ketone), DMF (N, N-dimethylformamide), DMA (N, N-dimethylacetamide), methyl acetate, ethyl acetate, n-butyl acetate, 3-methoxybutyl acetate, A mixed solvent is mentioned.
In the pattern printing sheet of the present invention, the printing method of the transparent pattern is not particularly limited, and a known method can be used, and examples thereof include a flexographic printing method, a gravure printing method, a stencil printing method, and an ink jet printing method. It is done.

As an embodiment of the pattern printing sheet of the present invention, as shown in FIG. 2, the substrate 2 comprises a base material 21 and a liquid repellent layer 22 laminated on the transparent pattern 3 printing side surface of the base material 21. Preferably, the liquid layer 22 repels ink that forms the transparent pattern 3.
In the pattern printing sheet 1 of the present invention, the liquid repellent layer 22 laminated as desired repels each droplet of ink during dot printing that forms the transparent pattern 3. When these droplets are repelled, the film can be made thicker, so that the reflection intensity increases.
In addition, the thickness of the liquid repellent layer 22 is about 0.1-10 micrometers normally, and 0.1-5 micrometers is preferable from a viewpoint that a thin film can be formed and it is cheap.

The substrate used for the pattern printing sheet of the present invention may be transparent or opaque.
The transparent substrate is a material that transmits visible light (average transmittance is 60% or more, preferably about 80% or more at a wavelength of 380 nm to 780 nm), and infrared reflection used for reading compared to a dot pattern. Although it will not specifically limit if a rate is low enough, What was formed with the material with few optical malfunctions is preferable. A so-called film, sheet, or plate is appropriately used. Specifically, as the material for the transparent substrate, glass, TAC (triacetyl cellulose), PET (polyethylene terephthalate), polycarbonate, polyvinyl chloride, acrylic, polyolefin, or the like is preferably used. Moreover, thickness is suitably selected from the range of about 20-5000 micrometers according to material, required performance, and a usage form.
In the case where a material that is easily dissolved or swelled in a solvent such as a polymer film such as a TAC film is used as the transparent substrate, a barrier is provided on the substrate so that the substrate is not attacked by the solvent in the coating solution used at the time of transparent pattern printing. It is preferable to provide a layer. In this case, the barrier layer may also serve as the alignment film. For example, a water-soluble substance such as PVA (polyvinyl alcohol) or HEC (hydroxyethyl cellulose) may be used as the barrier layer.
Examples of the opaque substrate include paper, cloth, plastic to which a dye or pigment is added, and a metal plate.

  In addition, as a material used for the liquid repellent layer composition for forming the liquid repellent layer 22, a substance having a property of repelling ink droplets forming a transparent pattern is selected. In addition, a transparent resin using an organic resin, an inorganic resin, or the like is particularly preferable in that a layer can be formed by coating. The resin used for the liquid repellent layer composition is not particularly limited, and examples thereof include thermoplastic resins, thermosetting resins, and ionizing radiation curable resins. Among these, from the viewpoint of obtaining durability, solvent resistance, and a wide reading angle, a resin of a type that is cured by crosslinking is preferable, and further, it can be crosslinked in a short time by ionizing radiation such as ultraviolet rays and electron beams. An ionizing radiation curable resin is more preferable. If these resins themselves do not have sufficient liquid repellency for the transparent pattern forming ink, a liquid repellency leveling agent is further added.

Examples of the thermoplastic resin include acrylic resins, polyester resins, thermoplastic urethane resins, vinyl acetate resins, cellulose resins, and the like, and the transparent substrate 2 is made of cellulose such as TAC (triacetyl cellulose). In the case of a resin, as the thermoplastic resin, for example, a cellulose-based resin such as nitrocellulose, acetylcellulose, cellulose acetate propionate, and ethylhydroxyethylcellulose is preferable.
Examples of the thermosetting resin include phenol resin, urea resin, diallyl phthalate resin, melamine resin, guanamine resin, unsaturated polyester resin, urethane resin, epoxy resin, aminoalkyd resin, melamine-urea cocondensation resin, silicon resin. , Polysiloxane resin, curable acrylic resin, and the like. When a thermosetting resin is used, a curing agent such as a crosslinking agent and a polymerization initiator, a polymerization accelerator, a solvent, a viscosity modifier and the like can be further added as necessary.

As described above, the material used for the liquid repellent layer composition is preferably an ionizing radiation curable resin, and various reactive monomers and / or reactive oligomers are preferably used. For example, examples of the reactive monomer include the above-mentioned polyfunctional (meth) acrylate monomer. Examples of the reactive oligomer include an oligomer having a radical polymerizable unsaturated group in the molecule, for example, the above-mentioned polyfunctional (meth) acrylate oligomer.
Moreover, as a polymerization initiator of a reactive monomer or a reactive oligomer, the above-mentioned bisacylphosphine oxide-based or α-aminoketone-based photopolymerization initiator may be mentioned.

  The liquid repellent leveling agent used in the liquid repellent layer composition according to the present invention may be anything as long as it repels the ink that forms the transparent pattern 3. As the type of the leveling agent, various compounds such as silicone, fluorine, polyether, acrylic acid copolymer and titanate can be used. In order to repel ink of a liquid crystal material forming a fixed cholesteric structure, an acrylic acid copolymer leveling agent (for example, trade name “BYK361” manufactured by BYK Chemie) is particularly preferable. The addition amount may be appropriately adjusted according to a desired reading angle. When the resin itself selected as the material for the liquid repellent layer composition already has sufficient liquid repellency for the transparent pattern forming ink, the addition of the liquid repellent leveling agent can be omitted. Examples of the resin having high liquid repellency include silicon resin and fluorine resin.

  Further, in the liquid repellent layer, if necessary, the transparent pattern invisible light reflection function, the moire preventing effect, and the transparency in the present invention are within the range not hindering, for example, coating liquid or Various known additives in the ink may be added as appropriate. Examples of the additive include a light stabilizer such as an ultraviolet absorber, an antistatic agent, a heat stabilizer, a lubricant, a surfactant, and a dispersion stabilizer.

The liquid repellent layer can be formed of a (meth) acrylate resin composition or a liquid repellent layer composition ink obtained as described above by a known layer forming method such as a coating method or a printing method. Specifically, the ink of the (meth) acrylate resin composition is applied to the printing surface of the transparent pattern 3, or the ink of the liquid repellent layer composition is applied to the base material, using a coating method such as roll coating, comma coating, or die coating, or It may be formed by a printing method such as screen printing or gravure printing.
The base material 21 in the pattern printing sheet 1 of FIG. 2 is not particularly limited as long as it is a material that transmits visible light, and the same material as the substrate can be used.

As shown in FIG. 3, the pattern printing sheet 1 of the present invention reads the reflection pattern of the pattern printing sheet 1 by using an input terminal 6 that can irradiate and detect non-visible light. It is possible to provide information (positional coordinates) regarding the position of the input terminal at.
The pattern printing sheet 1 of the present invention is preferably mounted on a display device 5 capable of displaying an image, and is preferably mounted facing the front surface of the display device.
Note that mounting attached to the front face includes both a form in which the display apparatus is attached in close contact with the front face of the display apparatus and a form in which the display apparatus is mounted in an isolated state through the gap.
In the pattern printing sheet of the present invention, the pattern is set so that position information of the input terminal on the sheet surface can be derived from a partial pattern read by an input terminal equipped with a sensor.
Such patterns are also exemplified in Patent Documents 1 and 2. For example, a plurality of dot shapes are set, and a combination of these plural-shaped dots arranged within a predetermined range in a plane is used. Something like a pattern, some where the thickness of the ruled lines arranged vertically and horizontally is changed, and the combination of the sizes of the overlapping parts of the ruled lines within a predetermined range is patterned. In particular, a simple and suitable one is to set reference points that are evenly spaced in the vertical and horizontal directions, and to place dots that are displaced vertically and horizontally with respect to this reference point. In addition, a method using the relative positional relationship of these dots from the reference point can be used. This method is advantageous in increasing the resolution of the input device because the dot size can be made small and constant.
In the present invention, the shape of the transparent pattern in plan view is appropriately selected according to the application. A dot (dot) shape, a line segment (striped) shape such as a barcode, and the like are typical. In particular, when position information (coordinates) is input, the transparent pattern is preferably a dot pattern.

In the pattern printing sheet of the present invention, in order to detect the reflection pattern by the non-visible light sensor provided in the input terminal, it is preferable that the non-visible light reflectance at the selective reflection peak wavelength is large. Usually, the reflectivity is about 5 to 50% at the selective reflection peak wavelength, and preferably 20% or more. The reflection by the cholesteric structure has a property of reflecting only circularly polarized light in the same direction as the cholesteric spiral, and therefore reaches only about 50% at the maximum.
In the case of reflection by a cholesteric structure, the reflection intensity is generally larger when the printing thickness is thick, but if it is too thick, the orientation of the liquid crystal is disturbed, the transparency is lowered, and the drying load is increased. The printing thickness is usually about 1 to 20 μm, preferably about 3 to 10 μm.
When the print pattern is a dot pattern, the dot shape is not particularly limited as long as it can be easily distinguished from adjacent dots, and usually, the shape in plan view is a circle, an ellipse, a polygon, or the like. The three-dimensional shape of the dot is not particularly limited and is usually a disc shape, but may be a hemispherical shape or a concave shape.

Further, in the pattern printed sheet of the present invention, when handwriting is input with an input terminal such as a pen type, the pattern is printed in order to give a strength that can withstand repeated input terminals or to make the appearance completely transparent. A transparent layer (or a hard coat layer (a surface protective layer made of a hard coating) may be provided so as to fill the gap between the patterns with a transparent material having a refractive index close to that of the material. As another function, The transparent layer may be added with functions such as abrasion resistance, antireflection, anti-slip, antistatic, antifouling, antiglare, etc. The material of the transparent layer is not particularly limited, Those used in the field of transparent sheets and lenses can be used, for example, acrylic resins, silicon resins and the like that are crosslinked and cured by ultraviolet rays, electron beams, heat, etc., and have a glass transition temperature of 100 ° C. That's it Acrylic resins are preferred.
Furthermore, in order to ensure the visibility of the display device behind the pattern printed sheet of the present invention, an antireflection film or the like may be provided on the surface or inside of the sheet. The material of the antireflection film is not particularly limited, and those used in the field of normal display transparent sheets and lenses can be used. For example, a dielectric in which a thin film of a low refractive index material such as magnesium fluoride or fluorine resin and a thin film of a high refractive index material such as zirconium oxide or titanium oxide are laminated so that the low refractive index thin film is the outermost surface A multilayer film or the like is a typical one.

The image display medium on which the pattern print sheet of the present invention is mounted is an object that displays various types of image information. The image information to be displayed may be in the form of either a still image or a moving image. The types of information include encryption codes such as letters, numbers, figures, barcodes, and photographic images (landscapes, people, paintings, and other various types). And so on. Examples of specific media include display devices such as CRT (cathode ray tube), LCD (liquid crystal display device), PDP (plasma display), EL (electroluminescence) display device, or paper or resin film on which an image is printed. is there. Examples of the usage or specification form include various types described later (such as a mobile phone). It may be connected to an information processing apparatus that processes handwritten input data, or may be independent. The former is preferable because the locus at the time of handwriting input can be displayed on the screen and intuitive input is possible, but the present invention is not limited to handwriting input, and any input method may be used.
Information processing devices that handle handwritten input or other information input by other methods include various mobile terminals such as mobile phones and PDAs, personal computers, video phones, televisions with intercommunication functions, Internet terminals, etc. Can be illustrated. Or a book, a brochure, a catalog, a form, an instruction manual, etc. can be illustrated. In the following, a description will be made focusing on a typical usage form, which is installed opposite to the front surface of the screen of the display device and inputs handwritten information on the screen.

The input terminal 6 that can be used in the present invention is not particularly limited as long as it can emit invisible light i and can detect the reflected light r of the pattern as shown in FIG. For example, as an example in which the pen-type input terminal 6 also includes the read data processing device 7, a pen tip that does not include ink, graphite, or the like, disclosed in JP 2003-256137 A, an invisible light irradiation unit And a camera incorporating a communication interface such as a wireless transceiver using a CMOS camera, processor, memory, Bluetooth technology, etc., and a battery.
As the operation of the pen type input terminal 6, when the pen tip is drawn so as to be brought into contact with the front surface of the pattern printing sheet 1 on which the dot pattern is printed as shown in FIG. The pressure applied previously is detected, the CMOS camera is activated, and a predetermined range near the pen tip is irradiated with invisible light of a predetermined wavelength emitted from the non-visible light irradiation unit, and a pattern is imaged (pattern imaging). Is performed, for example, several tens to 100 times per second). When the pen-type input terminal 6 includes the read data processing device 7, the input trace associated with the movement of the pen tip during handwriting is digitized and converted into data by analyzing the captured pattern with a processor. The input trajectory data is generated and transmitted to the information processing apparatus.
Note that a communication interface such as a processor, a memory, a wireless transceiver using Bluetooth technology, and a member such as a battery are provided outside the pen-type input terminal 6 as a read data processing device 7 as shown in FIG. May be. In this case, the pen-type input terminal 6 may be connected to the read data processing device 7 with the code 8 or may transmit the read data wirelessly using radio waves, invisible light, or the like.
In addition, the input terminal 6 may be a reader as described in JP-A-2001-243006.

The read data processing device 7 applicable in the present invention has a function of calculating position information from continuous imaging data read by the input terminal 6, combining it with time information, and providing it as input trajectory data that can be handled by the information processing device. If it has, it will not specifically limit, What is necessary is just to comprise members, such as a processor, memory, a communication interface, and a battery.
Further, the read data processing device 7 may be built in the input terminal 6 as disclosed in JP 2003-256137 A, or may be built in an information processing device including a display device. Further, the read data processing device 7 may transmit the position information wirelessly to an information processing device provided with a display device, or may transmit it by a wired connection connected by a code or the like.
The information processing apparatus connected to the display device 5 sequentially updates the images displayed on the display device 5 based on the locus information transmitted from the read data processing device 7, thereby obtaining the locus input by handwriting on the input terminal 6. It can be displayed on the display device as if it were written with a pen on paper.

As described above, the pattern printing sheet of the present invention can be mounted on an existing display device as it is, and the production thereof is easier than a position input device such as an electrostatic type or a pressure sensitive type incorporated in the display device. And cost can be reduced. In addition, even if the function of providing position information is reduced due to thinned or scratched patterns that can provide printed position information, only the pattern printing sheet needs to be replaced. It becomes easy to handle for the user.
The pattern printing sheet of the present invention can be used as a liquid crystal protective sheet when mounted on a liquid crystal display. In addition, the pattern printing sheet of the present invention may be used in addition to being placed on the front surface of the display device, such as when used on paper such as an inspection request table (see Japanese Patent Application Laid-Open No. 2004-341831).

The pattern printing sheet of the present invention can be detachably mounted facing the front surface of the display device. In this way, not only one display device but also another display device can be attached. Further, it is preferable that the pattern printing sheet itself includes a mounting means for the display device so that the pattern printing sheet can be mounted on the display device side without performing processing for mounting. . The mounting means may be provided integrally with the pattern printing sheet or may be provided separately.
Examples of such mounting means include a device that hooks a buckle-shaped object on the corner of the display device, and a device that sandwiches an end of the display device. In the case of mounting on the front surface of the display device, there is a sticking tool that is provided on the contact surface side that comes into contact with the display device and has adhesiveness or adhesiveness for sticking to the display device. Examples of the sticking tool include those having adhesiveness or tackiness that are integrally attached to the pattern printing sheet, and those that include an adhesive or tackiness agent directly applied to the contact surface.
Note that, among adhesives, in particular, an adhesive form that can be bonded only by pressing without being subjected to chemical reaction or energy supply such as radiation irradiation, heating, etc., and can be peeled again after bonding, is particularly sticky. It is called sex. Further, among adhesives, a form in which the adhesiveness is particularly sticky is referred to as an adhesive.
In the present invention, the medium 5 to be mounted is not limited to a display device or means for displaying an image, and may be any medium. For example, paper, plastic, glass, etc. may be used. The reflective pattern printing sheet 1 may be mounted on the medium 5 instead of being adhered, but may be placed (arranged) on the medium, or may be disposed in a non-contact state as described above.

The pattern printing sheet of the present invention is preferably separable from the pattern printing sheet in order to improve the manufacturing convenience. Specific examples include those that can be separated with a cutting tool such as a scissors or a dedicated cutting tool, and those that can be separated by hand by inserting perforations. If this is the case, the user can cut according to the size of the display device owned by each user, so the manufacturer has set several predetermined sizes. This is because a sheet may be manufactured. Further, a perforation may be made in the standard size of a general-purpose display device.
Also, if such usage is possible, it is possible to divide one sheet on which a pattern providing position information is printed, and to indicate different coordinate ranges for each sheet. When such a sheet is used, for example, if a sheet indicating continuous coordinates is applied to an adjacent display device, continuity can be given to input data. In addition, by switching a plurality of pattern print sheets having different coordinate ranges for one input device, different meanings can be given to the respective pattern print sheets.

Next, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples.
Example 1
A retroreflective material (Art Bright Color; manufactured by Komatsu Process Co., Ltd.) with glass beads having an average particle diameter of 6 μm and a refractive index of 2.2 is printed in a dot pattern on a PET substrate by a gravure method to form a pattern printing sheet Produced.
When this pattern printing sheet was read with a pen-type sensor that irradiates infrared rays and reflected light was detected as an image, it could be read up to 40 ° and had a wide reading angle.
Here, the reading angle of 40 ° means that the reading angle has a tilt of 40 ° with 0 ° when the infrared ray is irradiated perpendicularly to the sheet.

Example 2
A solution obtained by dissolving 100 parts by weight of pentaerythritol triacrylate, 0.03 part by weight of a leveling agent (trade name “BYK361”, manufactured by Big Chemie) and 4 parts by weight of a polymerization initiator in MEK (methyl ethyl ketone) was formed on a PET substrate. It was produced in the same manner as in Example 1 except that the film was formed as a substrate.
When the reading angle was measured in the same manner as in Example 1, it was possible to read up to 40 °, and the reading angle was wide.

Comparative Example 1
As a material used for the dot pattern, 100 parts by weight of a monomer having a polymerizable acryloyl group at the terminal and a nematic-isotropic transition temperature of around 110 ° C., and a chiral agent having a polymerizable acryloyl group at the terminal of 3.0 weight A pattern was formed on a PET substrate with an alignment film using a solution obtained by dissolving 4 parts by weight of a photopolymerization initiator (BSC, Lucillin TPO) in methyl isobutyl ketone.
When the reading angle was measured in the same manner as in Example 1, it was 0 °.

  As described above in detail, the pattern printing sheet of the present invention can be applied to an application in which various information associated with the image information is provided by placing it on the front surface of a medium for displaying various image information. In particular, it is suitable as a member that provides coordinate detection means for a data input system that is directly handwritten on the screen of a display device. In addition to being able to reduce the work space, it is lightweight, mass-produced, inexpensive, and large. The area can be easily increased, it is difficult to be visually recognized, and the reading angle is wide. For this reason, it can be used easily and has high practical performance. Various information processing such as mobile terminals such as mobile phones and PDAs, personal computers, videophones, televisions equipped with an intercommunication function, Internet terminals, etc. Can be used in the device.

It is sectional drawing which shows one embodiment of the pattern printing sheet of this invention. It is sectional drawing which shows another one embodiment of the pattern printing sheet of this invention. It is the schematic of the whole system using the pattern printing sheet of this invention. It is a principal part enlarged plan view which shows the example in which the dot-shaped reflective transparent pattern was irregularly arranged in the pattern printing sheet of this invention.

Explanation of symbols

1: Pattern printing sheet 2: Substrate 3: Transparent pattern 5: Display device 6: Input terminal (pen type)
7: Reading data processing device 8: Code 21: Base material 22: Liquid repellent layer i: Invisible light (incident light)
r: reflected light

Claims (14)

  A transparent pattern that reflects invisible light is printed on the surface of the substrate, and the ink constituting the transparent pattern includes a material that reflects invisible light. The material that reflects invisible light is a retroreflective material. There is a pattern printing sheet.   The said board | substrate consists of a base material and the liquid repellent layer laminated | stacked on the said transparent pattern printing side surface of this base material, This liquid repellent layer repels the ink which forms the said transparent pattern. The printed pattern sheet as described.   The pattern printed sheet according to claim 1, wherein the substrate is a transparent substrate.   The pattern printing sheet according to claim 1, wherein the transparent pattern is a dot pattern.   The pattern printing sheet according to claim 1, wherein a printing thickness of the transparent pattern is 1 to 20 μm.   The pattern printing sheet according to claim 1, wherein the invisible light is infrared light or ultraviolet light.   The pattern printing sheet according to claim 1, wherein the transparent pattern has a selective reflection peak wavelength at 800 to 950 nm.   The pattern printing sheet according to claim 1, wherein the transparent pattern has a selective reflection peak wavelength at 200 to 400 nm.   The pattern printing sheet can provide information on the position of the input terminal on the sheet by reading the reflection pattern of the sheet using an input terminal capable of irradiating and detecting invisible light. The printed pattern sheet as described.   The pattern printing sheet according to claim 9, wherein the pattern printing sheet is a sheet attached to a display device capable of displaying an image.   The pattern printing sheet according to claim 9, wherein the pattern printing sheet is mounted to face a front surface of the display device.   The pattern printing sheet according to claim 10, further comprising mounting means for mounting on the display device.   The pattern printing sheet according to claim 12, wherein the mounting means is a sticking tool that is provided on a contact surface side that comes into contact with the display device and has adhesiveness or adhesiveness for sticking to the display device.   The pattern printing sheet according to claim 1, wherein the pattern printing sheet is separable.

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