JP2008026958A - Infrared reflection pattern print transparent sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an infrared reflection pattern print transparent sheet whose weight is light, whose price is inexpensive, whose area enlargement is simple, whose mass production is possible, and whose strength against the repeated contact of an input terminal is strong, for enabling a user to input data by directly handwriting the data on a display device. <P>SOLUTION: This infrared reflection pattern print transparent sheet is provided with a print face configured by printing a transparent pattern having the regularity of infrared reflectiveness on the surface of a transparent substrate, and the print face is oppositely mounted on the front face of the display device on which an image can be displayed. Ink configuring the transparent pattern includes materials on which an infrared ray is reflected, and the transparent pattern is able to provide information relating to the position of an input terminal on the transparent sheet by emitting infrared rays from the back side of the print face, and reading the reflection pattern of the infrared rays by using an input terminal for emitting and detecting the infrared rays. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention is a member that provides a coordinate detection means that can be applied to a data input system in which handwriting is directly performed on the screen of a display device, and is particularly lightweight, inexpensive, easy to increase in area, and capable of mass production. In addition, the present invention relates to an infrared reflective pattern printed transparent sheet having extremely high strength against repeated input terminal contact when data is input.

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: A special mark that is formed by reading a mark that provides position information formed on the surface to be written with a sensor installed on the pen, and the surface to be written absorbs infrared rays as a mark that provides position information. Infrared irradiation unit that is a special sheet on which a dot pattern is printed, the pen irradiates the writing surface with infrared rays, and an infrared pattern reflected by the dot pattern Writing type input device has been proposed which is provided with an infrared sensor for detecting.
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 satisfying such a requirement, for example, Patent Document 1 is a transparent sheet mounted on the front surface of a display device, and provides position information for indicating the position of an input locus by an input electronic pen or the like. A mark having a dot pattern is printed using 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, the orientation of the printing surface, or the arrangement of positional information, but describes the idea or desire of the transparent sheet. However, there is no illustration of a specific transparent sheet.

  By the way, when such a transparent sheet is practically used, as can be seen from FIG. 5 of Patent Document 1, it is printed on the surface of the transparent substrate in order to read the input electronic pen on the dot pattern. It is necessary to protect the dot pattern. That is, it is necessary to provide a hard coat layer so that the dot pattern is not damaged even when the input electronic pen is repeatedly contacted. However, unlike mere hard coating on the substrate surface, the dot pattern is printed, and thus there is a problem that the material constituting the hard coating layer, the coating method, and the like are restricted.

Japanese Patent Laid-Open No. 2003-256137

  The present invention has been made to solve the above-described problems, and can be directly handwritten on the display device to input data, is lightweight, inexpensive, easy to increase in area, and can be mass-produced. Moreover, an object of the present invention is to provide an infrared reflection pattern printed transparent sheet having extremely high strength against repeated input terminal contact.

As a result of intensive studies to achieve the above object, the present inventors have printed a transparent pattern having regularity of infrared reflectiveness on the surface of a transparent substrate, and a display device capable of displaying an image of the printed surface. It is applied to a data input system that has a very high strength against the contact of an input terminal such as an electronic pen and is directly handwritten on the screen of a display device by being mounted facing the front surface. The present invention has been completed by finding that it has sufficient infrared reflection performance.
That is, the present invention has a printed surface on which a transparent pattern having infrared reflective regularity is printed on the surface of a transparent substrate, and the printed surface is attached to the front surface of a display device capable of displaying an image. The transparent sheet includes a material that reflects infrared rays, and the transparent pattern irradiates infrared rays from the back side of the printed surface using an input terminal capable of irradiating and detecting infrared rays. And the infrared reflective pattern printing transparent sheet which can provide the information regarding the position of the input terminal on a transparent sheet by reading an infrared reflective pattern is provided.

  In addition to being able to reduce the work space, the infrared reflective pattern-printed transparent sheet of the present invention can be directly handwritten on the display device. In addition to being able to reduce work space, it is lightweight, inexpensive, easy to increase in area, and mass-produced. In addition, it has a very high strength against repeated input terminal contact.

As shown in FIG. 1, the infrared reflective pattern-printed transparent sheet (hereinafter sometimes simply referred to as “transparent sheet”) 1 of the present invention has regularity on the surface of the transparent substrate 2 (surface on the display device 5 side). A printing surface on which a transparent pattern 3 (hereinafter also referred to as “dot pattern” or “infrared reflection pattern”) 3 is printed is mounted facing the front surface of the display device 5 capable of displaying an image. . Here, “attached facing the front surface” means, for example, a case where the transparent sheet 1 is disposed in direct contact with the display device 5 or a case where the transparent sheet 1 is bonded via an adhesive layer or an adhesive layer. In addition, it is a concept including a case where it is arranged in front of the display device 5 in a non-contact state through a gap.
For convenience of illustration, in FIG. 1, the transparent pattern 3 is illustrated as if it is located on the surface opposite to the display device 5. It is the non-printing surface of the transparent substrate 2 that faces the input terminal 6.

  Next, the ink constituting the transparent pattern 3 includes a material that reflects infrared rays (hereinafter may be simply referred to as “infrared reflective material”), and the transparent pattern 3 is an input terminal 6 that can irradiate and detect infrared rays. Is used to read information about the position of the input terminal on the transparent sheet 1 by reading an infrared reflection pattern from the back side of the printing surface of the transparent sheet 1.

There are various methods for obtaining information on the position of the input terminal 6 on the transparent sheet 1, as will be described in detail later. As a preferable method, a transparent pattern is obtained by seeing through the transparent substrate 2 from the back side of the printing surface. The coordinate system of the coordinate information provided when 3 is read by the input terminal 6 and the coordinate system when the image display surface of the display device 5 is viewed from the input terminal 6 side, the right-hand system / left-hand system of the coordinate system There is a method of matching the relationship between the two.
The right-hand / left-hand system here is a kind of orthogonal coordinate system, and the direction of the middle finger with the right hand thumb, index finger, and middle finger orthogonally crossed to each other is x, thumb y, and index finger z. The coordinate system to be taken is the right-handed system, and this mirror image is the left-handed system.

Specifically, as an example, the normal direction (so-called line-of-sight direction) extended from the input terminal 6 to the image display surface of the display device 5 and / or the transparent sheet 1 is the positive direction of the z axis. In addition, with respect to the x and y axes in the left-handed coordinate system in the image display surface of the display device 5 as shown in FIG. 2A, the transparent substrate 2 from the back surface of the printing surface as shown in FIG. And the transparent pattern 3 is printed so that the x- and y-axis coordinate systems of the positional information provided when the transparent pattern 3 is detected by the input terminal 6 are also the left-handed coordinate system. In other words, the pattern is designed so that the x- and y-axis coordinate systems of the positional information provided when the transparent pattern 3 is detected by the input terminal 6 from the printing surface side is a left-handed coordinate system, and this is further mirrored And print.
2B, the transparent sheet 1 in which the coordinate system of the coordinate information when the transparent terminal 2 is seen through the transparent substrate 2 from the back side of the printing surface and detected by the input terminal 6 is the left-handed system. Is turned upside down and detected by the input terminal 6 from the printing surface side, the coordinate system provided by the transparent pattern 3 becomes a right-handed system as shown in FIG. At this time, depending on the algorithm for calculating the position information from the transparent pattern 3, the coordinates may not be normally calculated when the pattern becomes a mirror image.
In the present invention, the transparent pattern having regularity means that the transparent pattern has regularity to the extent that it has a function capable of providing position information by infrared reflection. For example, as shown in FIG. Even an irregular pattern arrangement is included in a transparent pattern having regularity as long as it has the above function.

The transparent substrate used for the infrared reflective pattern printed transparent sheet of the present invention is a material that transmits visible light and infrared rays in the wavelength band used for reading the transparent pattern (average transmittance is 60% or more at wavelengths of 380 nm to 780 nm, Especially, if the reflectance and absorption rate of infrared rays used for reading on the surface are small enough not to interfere with the detection of reflection by the printed infrared reflection pattern. Although not limited, those formed of a material with few optical defects are preferable. A so-called film, sheet, or plate is appropriately used. Specifically, as a material for the transparent substrate, inorganic materials such as glass and organic materials such as TAC (triacetyl cellulose), PET (polyethylene terephthalate), polycarbonate, polyvinyl chloride, acrylic, and polyolefin are 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 transparent pattern is used so that the substrate is not attacked by a solvent in a coating solution used at the time of transparent pattern printing described later. It is preferable to provide a barrier layer on the side on which is printed. In this case, the barrier layer may also serve as an alignment film described in detail later. For example, a water-soluble substance such as PVA (polyvinyl alcohol) or HEC (hydroxyethyl cellulose) may be used as the barrier layer.

  In the present invention, the surface of the transparent substrate has a print surface formed by printing a transparent pattern having infrared reflective regularity, and the print surface is attached to the front surface of a display device capable of displaying an image. Therefore, since the back side of the printing surface is in contact with an input terminal such as an electronic pen and the transparent pattern is not in direct contact with the input terminal, it has extremely high strength against repeated input terminal contact.

Further, when the strength against the contact of the input terminal is required, a hard coat layer (a surface protective layer made of a hard coating film) may be provided on the back side of the printing surface. The material for the hard coat layer is not particularly limited, and those used in the field of ordinary transparent sheets and lenses can be used. For example, acrylic resin, silicon-based resin, and the like that are crosslinked and cured by ultraviolet rays, electron beams, heat, and the like are representative.
Furthermore, in order to ensure the visibility of the display device behind the infrared reflective pattern printed transparent sheet of the present invention, an antireflection layer or an antiglare layer may be provided on the back side of the printing surface. The material of the antireflection layer is not particularly limited, and those used in the field of normal display transparent sheets and lenses can be used. For example, 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 alternately laminated so that the low refractive index thin film is the outermost surface. The dielectric multilayer film etc. which were made are typical.
Moreover, as an anti-glare layer, what disperse | distributed the inorganic or organic microparticles | fine-particles for providing anti-glare property to a transparent resin material can be used. As the transparent resin material, various transparent resins, for example, resins used in the optical field are suitably used, and silica and alumina can be exemplified as the inorganic fine particles. The organic fine particles are preferably resin beads having a refractive index of 1.40 to 1.60.

  In the infrared reflective pattern printed transparent sheet of the present invention, the functional layers such as the hard coat layer, the antireflection layer, and the antiglare layer are provided on the opposite side of the transparent pattern (the back side of the printing surface) with respect to the transparent substrate. In forming the functional layer, it is not necessary to consider the influence on the transparent pattern. Accordingly, there are advantages that the choice of the material of the functional layer is remarkably increased and a commercially available transparent substrate having a functional layer already provided on one surface can be used.

As an infrared reflective material having a transparent pattern that can be used in the infrared reflective pattern printed transparent sheet of the present invention, it is transparent in the visible region (average transmittance is 60% or more, preferably 80% or more at a wavelength of 380 nm to 780 nm). It is not particularly limited as long as it has infrared reflection performance, and for example, a liquid crystal material having a cholesteric structure and an infrared reflection pigment are preferable.
In the present invention, the wavelength of infrared rays is not particularly limited, but normally preferred is light in the near infrared region of 800 to 2500 nm, and particularly preferred is one having a selective reflection peak wavelength in the range of 800 nm to 950 nm.

Hereinafter, a liquid crystal material exhibiting a cholesteric structure applicable to the transparent sheet of the present invention will be described.
The liquid crystal material is a liquid crystal material exhibiting a cholesteric liquid crystal phase, and has a fixed cholesteric structure having wavelength selective reflectivity with respect to wavelengths in the infrared region, and is particularly limited as long as it has cholesteric regularity. Although not, a polymerizable chiral nematic liquid crystal material (polymerizable monomer or polymerizable oligomer) obtained by mixing a polymerizable chiral agent with a polymerizable nematic liquid crystal, or a polymer cholesteric liquid crystal material can be used. .
In the present invention, among the polymerizable liquid crystal materials, it is preferable to use a three-dimensionally crosslinkable polymerizable monomer or polymerizable oligomer, and it is more preferable that the polymerizable functional group has an acrylate structure.
The liquid crystal material exhibiting (expressing) the cholesteric structure is essentially a visible light region as long as it exhibits a high reflectance (usually about 5 to 50%) in at least a part of wavelengths in the infrared region. High transmittance is not necessarily required at a wavelength of. Even if the liquid crystal material having the cholesteric structure is completely opaque, if the area of the non-formation part (margin part) of the liquid crystal material is appropriately large and the transmitted light from there is used, the transparent pattern It is because it is possible to obtain desired transparency as a whole. However, it is needless to say that the liquid crystal material itself has a higher visible light transmittance. Usually, a liquid crystal material having such a cholesteric structure has a visible light transmittance of about 70% or more in a thickness of about several μm in the visible light region when a high reflection wavelength region is brought to the infrared region. obtain. On the other hand, in the infrared region, it is common to obtain a high reflectance of about 5 to 50%. Moreover, there is no restriction | limiting in particular about the temperature range in which the said polymeric liquid crystal material exhibits a cholesteric phase, Although it should just be fixable by three-dimensional bridge | crosslinking in the state of a cholesteric phase, the temperature which exhibits a cholesteric phase exists in the range of 30-140 degreeC. The material is preferable because it can simultaneously perform a drying process during pattern printing and a phase transition of liquid crystal.

If it is the above materials, a liquid crystal molecule can be optically fixed with the state of a cholesteric liquid crystal, and the pattern stable at normal temperature which can be easily handled as a transparent sheet can be formed. The three-dimensional crosslinking means that polymerizable monomer molecules or polymerizable oligomer molecules are polymerized three-dimensionally to form a network (network) structure.
Alternatively, a liquid crystal polymer (polymer cholesteric liquid crystal) that has a high glass transition point and can be solidified into a glass state at room temperature by cooling after heating can be used. Similarly, these materials can form liquid crystal molecules that are optically fixed in the form of liquid crystals having cholesteric regularity, and form a stable pattern at room temperature that is easy to handle as an optical sheet. Because you can.

  Examples of the three-dimensionally crosslinkable polymerizable monomer are disclosed in JP-A-7-258638, JP-A-11-513019, JP-A-9-506088 and JP-A-10-508882. A mixture of liquid crystalline monomers and chiral compounds can be used. For example, a chiral nematic liquid crystal (cholesteric liquid crystal) can be obtained by adding a chiral agent to a liquid crystalline monomer exhibiting a nematic liquid crystal phase. A method for forming a cholesteric liquid crystal is also described in JP-A-2001-56484.

  Examples of nematic liquid crystal molecules (liquid crystalline monomers) that can be used in the present invention include compounds represented by the following formulas (1) to (11). The compounds exemplified here have an acrylate structure and can be polymerized by ultraviolet irradiation or the like.

［化合物（１１）において、Ｘ¹は２〜５(整数）である。］

[In the compound (11), X ¹ is 2 to 5 (integer). ]

As the three-dimensionally crosslinkable polymerizable oligomer, a cyclic organopolysiloxane compound having a cholesteric phase as disclosed in JP-A-57-165480 can be used.
Further, the liquid crystal polymer includes a polymer in which a mesogenic group exhibiting liquid crystal is introduced into the main chain, a side chain, or both positions of the main chain and the side chain, a polymer cholesteric liquid crystal in which a cholesteryl group is introduced into the side chain, A liquid crystalline polymer as disclosed in Kaihei 9-133810, a liquid crystalline polymer as disclosed in JP-A-11-293252, or the like can be used.

  The chiral agent is a material that has an asymmetric carbon atom and forms a chiral nematic phase by mixing with a nematic liquid crystal, and is not particularly limited as long as it has polymerizability. As exemplified, a material having an acrylate structure is preferable because it can be polymerized by ultraviolet irradiation.

［Ｘは２〜５（整数）である。］

[X is 2 to 5 (integer). ]

  In the present invention, when a liquid crystal material having a cholesteric structure is used as the material of the transparent pattern, the property of reflecting the infrared ray of the transparent pattern is the wavelength selective reflectivity of the cholesteric structure (the same principle as Bragg reflection in X-ray diffraction The selective reflection peak wavelength (wavelength satisfying the Bragg reflection condition) is determined by the pitch length of the cholesteric structure included in the pattern, but when nematic liquid crystal and a chiral agent are used as the liquid crystal material The pitch length can be controlled by adjusting the amount of chiral agent added. The amount of chiral agent added to obtain the target selective reflection peak wavelength in the infrared region varies depending on the type of liquid crystal used and the type of chiral agent. For example, the liquid crystal of formula (11) and the chiral agent of formula (12) are used. In this case, a cholesteric phase having a reflection peak in the infrared region is formed by adding about 3 parts by mass of the chiral agent to 100 parts by mass of the liquid crystal. When polymer cholesteric liquid crystal is used as the liquid crystal material, a polymer material having a target pitch length may be selected.

The polymer of the nematic liquid crystal molecules and the chiral agent can be obtained, for example, by adding a known photopolymerization initiator or the like to the polymerizable nematic liquid crystal and the polymerizable chiral agent and irradiating with ultraviolet rays for radical polymerization.
In the present invention, when a transparent pattern is printed with the liquid crystal material described above, it is preferable to use a coating solution in which a polymerizable monomer, a polymerizable oligomer, or a chiral agent 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.

Next, the infrared reflective pigment applicable to the transparent sheet of the present invention will be described.
The infrared reflective pigment is a (colored) pigment that reflects in the near infrared region, and is calculated by the spectral reflectance (Rλi) defined by the architectural heat ray shielding and glass scattering prevention film defined in JIS A5759. This is a near-infrared reflective coloring pigment having an integral reflectance of 50% or more in a wavelength range of 780 to 2100 nm in terms of solar reflectance, and is roughly classified into an inorganic infrared reflective pigment and an organic infrared reflective pigment.

As the inorganic infrared reflective pigment, a known material can be used as long as it exhibits a desired reflectance at a target wavelength. For example, a white pigment having a high solar reflectance or a heat ray reflective performance or Metal powder pigments, specifically titanium oxide (TiO ₂ ), zinc oxide, zinc sulfide, lead white, antimony oxide, zirconium oxide, tin oxide, tin-doped indium oxide (ITO), tin-doped antimony oxide, etc. Inorganic powders and metal powders such as aluminum, gold and copper are preferably used. In addition, calcium carbonate, barium sulfate, silica, alumina (Al ₂ O ₃ ), clay, talc and the like can also be used.
In addition, antimony trioxide and antimony dichromate having infrared and far-infrared reflection performance, heat ray reflection performance, SiO ₂ (quartz), Al ₂ O ₃ (alumina), MgO—Al ₂ O ₃ —SiO ₂ (cordierite), Ca ₂ P ₂ O ₇ (apatite), MnO ₂ , Fe ₂ O ₃ , ZrO ₂ , ZrSiO ₄ (zircon), FeTiO ₃ (ilmenite), Cr ₂ O ₃ , FeCr ₂ O ₄ (chromite), V ₂ O ₅ Inorganic powders such as Bi ₂ O ₃ , MoO ₃ , SnO ₂ , ZnO, ThO ₂ , La ₂ O ₃ , CeO ₂ , Pr ₆ O ₁₁ , Nd ₂ O ₃ , Y ₂ O ₃ are also desired at the desired wavelength. It is preferably used when the reflectance is shown.
In addition, it comprises a transparent support material such as natural or synthetic mica, another leafy silicate, glass flakes, flaky silicon dioxide or aluminum oxide described in JP-A-2004-4840, and a metal oxide coating. Interference pigments can also be used.

Actually, when used in an ink used for a transparent pattern, it is used as a composite metal oxide having a plurality of types of the above components. Specific examples of such inorganic infrared pigments that are commercially available include, for example, yellow 10401, yellow 10408, brown 10348, green 10405, blue 10336, brown 10364, and brown 10363 (all trade names: manufactured by CERDEC). , AB820 Black, AG235 Black, AY150 Yellow, AY610 Yellow, AR100 Brown, AR300 Brown, AA200 Blue, AA500 Blue, AM110 Green (all trade names; manufactured by Kawamura Chemical Co., Ltd.), Pigment Black 28 (CuCr ₂ O ₄ ), Pigment black 27 {(Co, Fe) ( Fe, Cr) 2 O 4}, Pigment Green 17 (Cr ₂ O ₃₎ (all trade names, manufactured by Tokan Ltd.) desired reflection at the wavelength of interest among such It indicates the preferably used.
Among these, AB820 black, AG235 black, pigment black 28, and pigment black 27 are particularly preferable.

  As the organic infrared reflective pigment, a known material can be used as long as it exhibits a desired reflectance at a target wavelength. For example, in JP-A-2005-330466 and JP-A-2002-249676 Examples of the pigments are azo, anthraquinone, phthalocyanine, perinone / perylene, indigo / thioindigo, dioxazine, quinacridone, isoindolinone, isoindoline, diketopyrrolopyrrole. Preferred are organic, azomethine and azomethine azo organic dyes.

Actually, specific examples that are commercially available when used in the ink include, for example, SYMULER FAST YELLOW 4192 (Benzimidazolone), FASTONGN SUPER RED 500RG (quinacridone), FASTONGGN SUPER RED ATY (diaminoanthrack) Nonyl), FASTONGGN SUPER VIOLET RVS (dioxazine), FASTONGGN SUPER MAGENTA R (quinacridone), FASTONGGN SUPER BLUE 6070S (Indanthrone), FASTONGGN BLUE RSK (phthalocyanine α), FASTONGN BLUE STN Phthalocyanine) (all trade names; Dainippon It shows a Nki Kogyo Co., Ltd.) desired reflectance at the target wavelength of the like are preferably used.
Among these, phthalocyanine α, phthalocyanine β, and halogenated phthalocyanine are particularly preferable.

In addition, since most of the infrared reflecting pigments as described above are colored, if a defect such as loss of visibility of the display is expected, ultrafine particles having a particle diameter of not more than the wavelength of visible light, preferably not more than 100 nm. When is used, the transparency of the obtained transparent sheet is improved.
When preparing an ink using the infrared reflective pigment, a dispersant may be used to improve the dispersibility of the pigment, and the type of the dispersant is not particularly limited, and a known one may be used. Specific examples that are commercially available include, for example, Dispersic 183, 110, 111, 116, 140, 161, 163, 164, 170, 171, 174, 180, 182, 2000, 2001, 2020 (trade names) ; Manufactured by Big Chemie Co., Ltd.).
In addition, the amount of the dispersant is preferably 1 to 50 parts by mass with respect to 100 parts by mass of the pigment.

Moreover, when printing the ink using the said infrared reflective pigment, it is preferable to use the coating liquid which disperse | distributed the said infrared reflective pigment in the solvent.
The solvent is not particularly limited and may be a known one. For example, alcohols such as methanol, ethanol, propanol, isopropanol, n-butanol, 2-butanol, isobutanol and tert-butanol, 2-ethoxy Ethanol, 2-butoxyethanol, 3-methoxypropanol, 1-methoxy-2-propanol, alkoxy alcohols such as 1-ethoxy-2-propanol, ketols such as diacetone alcohol, acetone, methyl ethyl ketone, methyl isobutyl ketone Ketones such as, aromatic hydrocarbons such as toluene and xylene, esters such as ethyl acetate and butyl acetate, and the like.

In addition, the coating liquid may be added to the coating liquid as necessary to improve the scratch resistance, and a binder component may be added. For example, conventionally known thermoplastic resins, reaction curable resins (thermosetting resins, ionizing radiation curable resins), mixtures thereof, and the like can be used.
Examples of the thermoplastic resin include polystyrene resin, polyester resin, cellulose resin, polyether resin, vinyl chloride resin, vinyl acetate resin, vinyl chloride-vinyl acetate copolymer resin, polyacrylic resin, polymethacrylic resin, polyolefin resin, A urethane resin, a silicone resin, an imide resin, etc. are mentioned.
Further, it is preferable to use at least one of the reaction curable resins, that is, thermosetting resins and ionizing radiation curable resins. Examples of the thermosetting resin include phenol resin, urea resin, diallyl phthalate resin, melamine resin, guanamine resin, unsaturated polyester resin, polyurethane resin, epoxy resin, aminoalkyd resin, melamine-urea cocondensation resin, silicon resin, Examples thereof include polysiloxane resins. Examples of ionizing radiation curable resins include radical polymerizable unsaturated groups ((meth) acryloyloxy group, vinyloxy group, styryl group, vinyl group, etc.) and cationic polymerizable groups (epoxy group, thioepoxy group, vinyloxy group, oxetanyl). Resin having at least one functional group such as a relatively low molecular weight polyester resin, polyether resin, (meth) acrylic resin, epoxy resin, urethane resin, alkyd resin, spiroacetal resin, polybutadiene resin. And polythiol polyene resin.

As needed for these reaction curable resins, crosslinking agents (epoxy compounds, polyisocyanate compounds, polyol compounds, polyamine compounds, melamine compounds, etc.), polymerization initiators (azobis compounds, organic peroxide compounds, organic halogen compounds, oniums) Conventionally known compounds such as curing agents such as UV photoinitiators such as salt compounds and ketone compounds) and polymerization accelerators (organic metal compounds, acid compounds, basic compounds, etc.) are used. Specific examples include compounds described by Fuzo Yamashita and Tosuke Kaneko “Crosslinking Agent Handbook” (published by Taiseisha, 1981).
The ionizing radiation curable resin preferably has an acrylate-based functional group, for example, a relatively low molecular weight polyester resin, polyether resin, acrylic resin, epoxy resin, urethane resin, alkyd resin, spiroacetal resin. , Oligomers or prepolymers of polyfunctional compounds such as polybutadiene resins, polythiol polyene resins, polyhydric alcohols, etc., and reactive diluents such as ethyl (meth) acrylate, ethylhexyl (meth) acrylate, styrene, methylstyrene, Monofunctional monomers such as N-vinylpyrrolidone as well as polyfunctional monomers such as trimethylolpropane tri (meth) acrylate, hexanediol (meth) acrylate, tripropylene glycol di (meth) acrylate, di A relatively large amount of tylene glycol di (meth) acrylate, pentaerythritol tri (meth) acrylate, dipentaerythritol hexa (meth) acrylate, 1,6-hexanediol di (meth) acrylate, neopentyl glycol di (meth) acrylate, etc. Can be used.

In order to make the ionizing radiation curable resin composition into an ultraviolet curable resin composition, acetophenones, benzophenones, Michler's benzoylbenzoate, α-amyloxime ester, tetramethylthiuram are used as photopolymerization initiators. Monosulfides and thioxanthones are preferred.
In addition to the photopolymerization initiator, a photosensitizer may be used. Examples of photosensitizers include n-butylamine, triethylamine, tri-n-butylphosphine, Michler's ketone and thioxanthone.
In addition, the quantity of a binder component is 5-80 mass parts normally with respect to 100 mass parts of said coating liquids, Preferably it is 10-50 mass parts, More preferably, it is 20-40 mass parts.
Moreover, it is preferable that the density | concentration of the said infrared reflective pigment is 5-60 mass% with respect to the transparent ink whole quantity. Moreover, when the addition amount of a dispersing agent is considered, the quantity of an infrared reflective pigment is 30-85 mass parts in 100 mass parts of solid content contained in the said coating liquid, Preferably it is 40-80 mass parts, More preferably, it is 50-70. Part by mass.

  Furthermore, when printing the ink using the infrared reflective pigment, it is preferable to perform the easy adhesion improving treatment on the printing surface of the transparent substrate because the ink printability or adhesiveness is improved. The easy adhesion improving treatment is not particularly limited and may be a known method. For example, corresponding to a base film made of a resin mainly composed of polyethylene terephthalate, the easy adhesive layer may be a polyester resin or the like. desirable.

  In the transparent sheet of the present invention, the printing method of the transparent pattern is not particularly limited, and a known method can be used. Examples thereof include a flexographic printing method, a gravure printing method, a stencil printing method, and an ink jet printing method. .

In the infrared reflective pattern printed transparent sheet of the present invention, the transparent 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. It is.
The transparent pattern in the present invention is also exemplified in Patent Document 1. For example, a plurality of dot shapes are set, and a combination of dots having a plurality of shapes arranged in a predetermined range in a plane is patterned. A pattern in which the size of the overlapping part of the ruled lines within a predetermined range is changed by changing the thickness of the ruled lines arranged in the vertical and horizontal directions, and the x and y coordinate values are directly set to the vertical and horizontal sizes of the dots. In particular, a simple and suitable one is to set reference points arranged at equal intervals in the vertical and horizontal directions, and arrange dots displaced vertically and horizontally with respect to this reference point. There is a method using a relative positional relationship from the reference point. 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, as described above, the infrared reflection pattern is read from the back side of the printing surface of the transparent sheet to obtain information on the position of the input terminal on the transparent sheet. When forming a pattern, the relationship between the right-handed system and the left-handed system of the coordinate system is the coordinate system of coordinate information provided when seen through the transparent substrate from the back side of the printing surface, and the image display of the display device It is important to match both of the coordinate systems when the surface is viewed from the input terminal side.

In the infrared reflection pattern printed transparent sheet of the present invention, in order to detect the reflection pattern by the infrared sensor provided in the input terminal, it is preferable that the infrared reflectance at the wavelength irradiated and detected by the sensor is large. Usually, the reflectance is about 5 to 50% at the wavelength irradiated and detected by the sensor, and preferably 20% or more.
When a liquid crystal material having a cholesteric structure is used as the infrared reflecting material, 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 strength is generally larger when the printing thickness is thicker, but if it is too thick, the orientation of the liquid crystal is disturbed, the transparency is lowered, and the drying load is increased. Usually, it is about 1-20 micrometers, Preferably it is about 3-10 micrometers.
Moreover, when using an infrared reflective pigment as the infrared reflective material, the printed thickness of the infrared reflective pattern may be 0.1 μm or more, but is usually about 1 to 20 μm. In general, the thicker the film thickness, the better the reflectivity. However, since the coloring becomes dark and the transparency is impaired, it is necessary to adjust appropriately.

  In the infrared reflective pattern-printed transparent sheet of the present invention, the dot shape of the dot pattern is not particularly limited as long as it can be easily distinguished from adjacent dots. Usually, the shape in plan view is a shape such as a circle, an ellipse, or a polygon. . Further, there is no particular limitation on the three-dimensional shape of the dot, and examples include a substantially disk shape, a hemispherical shape, a concave shape, and a polygonal shape.

  In the infrared reflection pattern printed transparent sheet of the present invention, although not necessarily required, when a liquid crystal material is used as the transparent pattern, the alignment film 4 is provided on the transparent substrate 2 in order to stabilize the liquid crystal alignment. It is preferable to keep (see FIG. 5). The material of the alignment film is not particularly limited. For example, PI (polyimide), PVA, HEC, PC (polycarbonate), PS (polystyrene), PMMA (polymethyl methacrylate), PE (polyester), PVCi (polyvinyl cinnamate), Known alignment film materials such as PVK (polyvinylcarbazole), polysilane containing cinnamoyl, coumarin, and chalcone can be used. An alignment film formed using these materials may be subjected to a rubbing treatment or the like. Moreover, you may adhere | attach the resin sheet extended | stretched as alignment film to a transparent substrate.

In the infrared reflective pattern-printed transparent sheet of the present invention, the transparent layer 9 is formed on the surface of the transparent substrate with substantially the same thickness as the transparent pattern 3 (see FIG. 7) or a thickness covering the transparent pattern 3 (see FIG. 6). It is preferable that In the case of a dot pattern of a transparent sheet as in Patent Document 1, as shown in FIG. 8, the dot pattern 3 has a shape with a slight R, and this sheet is substantially transparent in the visible region. However, the dot pattern printed on the transparent substrate 2 is not completely invisible due to the lens effect due to the difference in refractive index between the dot and the air interface. In addition, when fine irregularities occur on the surface of the dot pattern, light scattering occurs due to the irregularity of the refractive index with the air interface, and the dot pattern 3 on the transparent substrate 2 may appear a little whitish.
When such a transparent sheet is placed in front of a display displaying an image, moire is generated. Moire is a striped pattern that is visually generated due to a shift in the period when a plurality of repeated patterns having a certain degree of regularity are superimposed. An image display device such as a CRT, LCD, or plasma display expresses an image with an array of fine light emitting dots, and moire in this case occurs when the array of light emitting dots on the display interferes with the dot pattern. .
In the present invention, by printing a transparent pattern on the surface of the transparent substrate 2 and providing the transparent layer 9, this moire does not occur at all or even if it occurs, it is practically inconspicuous visually. Further, moire can be reduced to the extent that does not hinder image recognition.

In the case of FIG. 7 in which the transparent layer 9 is formed on the transparent substrate 2 with substantially the same thickness as the transparent pattern 3, (the thickness of the transparent pattern 3) − (the thickness of the transparent layer 9). Is preferably 0.15 μm or less and the space between the transparent patterns is filled.
That is, in order to reduce the lens effect of the dot pattern and reduce moire, the step of the refractive index difference between the doto pattern and the surrounding air layer is reduced, and the interface between the dot pattern and the transparent layer and the air is reduced. It is preferable to reduce the uneven step. Even when the transparent layer is formed with a thickness covering the transparent pattern, the uneven step on the surface of the transparent layer is preferably smaller than the wavelength of visible light (0.38 to 0.78 μm). It is preferable to have a flatness of about 15 μm or less. Moreover, when the unevenness | corrugation of the surface of a transparent pattern scatters light and a pattern looks a little whitish, it is effective to form a transparentization layer with the thickness which completely covers the pattern surface.

The material constituting the transparent layer is not particularly limited, and various transparent materials such as a resin, a metal oxide, and glass can be used, but an organic resin in that a layer can be formed by coating, A transparent resin layer such as an inorganic resin is preferred. The transparent layer may have one or more functions other than the transparency, such as a pressure-sensitive adhesive layer, an adhesive layer, a shock absorbing layer, various filter layers, and a hard coat layer.
As the resin used for the transparent resin layer, the refractive index difference from the dot pattern is sufficiently small as will be described later, and the infrared reflectance and absorption rate used for reading are sufficiently low compared to the dot pattern. The resin is not particularly limited as long as it is a resin transparent to infrared rays to be used, and a known resin may be appropriately used in consideration of adhesion to a transparent substrate or ink forming a transparent pattern. Examples thereof include a plastic resin, a thermosetting resin, and an ionizing radiation curable resin. Among these, from the viewpoint of durability, solvent resistance and the like, a resin of a type that is cured by crosslinking is preferable, and further an ionizing radiation curable resin that can be crosslinked in a short time by ionizing radiation is preferable. This ionizing radiation curable resin is advantageous because it can be coated and formed in a solvent-free or solvent-free state in that it easily fills the unevenness caused by the transparent pattern.

Examples of the thermoplastic resin include acrylic resins, polyester resins, thermoplastic urethane resins, vinyl acetate resins, and cellulose resins. According to a preferred embodiment of the present invention, the material of the transparent substrate is TAC ( In the case of cellulosic resins such as triacetylcellulose, preferred examples of the thermoplastic resin include cellulose resins such as nitrocellulose, acetylcellulose, cellulose acetate propionate, and ethylhydroxyethylcellulose.
Examples of the thermosetting resin include phenol resin, urea resin, diallyl phthalate resin, melanin 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.

Examples of the ionizing radiation curable resin include those having a (meth) acrylate functional group that is cured by ionizing radiation such as ultraviolet rays and electron beams, such as relatively low molecular weight polyester resins, polyether resins, acrylic resins, and epoxy resins. , Urethane resins, alkyd resins, spiroacetal resins, polybutadiene resins, polythiol polyene resins, oligomers or prepolymers such as (meth) arylate of polyfunctional compounds such as polyhydric alcohols, reactive diluents, etc. As monofunctional monomers such as ethyl (meth) acrylate, ethylhexyl (meth) acrylate, styrene, methylstyrene, N-vinylpyrrolidone and polyfunctional monomers such as polymethylolpropane tri (meth) acrylate, hexanediol (meth) Ak Rate, tripropylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, pentaerythritol tri (meth) acrylate, dipentaerythritol hexa (meth) acrylate, 1,6-hexanediol di (meth) acrylate, neopentyl glycol Examples include di (meth) acrylate. 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 also be used.

  Moreover, when using an ultraviolet curable resin as said ionizing radiation curable resin, it is preferable to use a photoinitiator together. Specific examples of the photopolymerization initiator include acetophenones, benzophenones, Michler benzoylbenzoate, α-amyloxime ester, tetramethylchuram monosulfide, and thioxanthones. 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 addition, in the transparent resin layer, if necessary, in addition to the resin, if necessary, for example, in the coating liquid or ink as long as it does not interfere with the infrared reflection function and moire prevention effect of the transparent pattern in the present invention. Various known additives and various pigments may be added. Examples of the additive include a light stabilizer such as an ultraviolet absorber, a dispersion stabilizer, and the like, and examples of the dye include known dyes in display filters such as an external light antireflection pigment. .
The transparent resin layer is a known layer such as a coating method or a printing method using, as a coating liquid or ink, a composition containing, in addition to the resin, usually a solvent and other various additives and pigments as necessary. It can be formed by a forming method. Specifically, the transparent pattern may be formed on the printed surface of the printed transparent substrate by a coating method such as roll coating, comma coating, or die coating, or a printing method such as screen printing or gravure printing. In the printing method, partial formation in an arbitrary shape is easy, but even in the coating method, partial formation can be performed by intermittent coating.

  The thickness of the transparent resin layer may be an appropriate thickness according to the thickness of the infrared reflection pattern, the required degree of transparency, etc., and is not particularly limited, but is usually almost the same as the thickness of the transparent pattern. Or the thickness of the grade which covers a transparent pattern is preferable. When the transparent resin layer is an adhesive layer or an adhesive layer, it is preferable to cover the transparent pattern.

The transparent resin layer may have an adhesive property to form an adhesive layer. In this case, there is an advantage that it is easy to detachably attach the infrared reflective pattern printing sheet to the front surface of the display device. Moreover, it can also be used for integrating with functional layers such as various filters within a range not impairing the infrared reflection function.
The pressure-sensitive adhesive layer is not particularly limited as long as transparency is obtained, and a known pressure-sensitive adhesive may be appropriately employed. Examples of the adhesive include acrylic resins, silicone resins, vinyl acetate resins, or rubber resins such as natural rubber, butyl rubber, polyisoprene, polyisobutylene, polychloroprene, and styrene-butadiene copolymer resins. is there. The adhesive layer may be composed only of such components, or may be formed by mixing with the components of the transparent resin layer described above.
The pressure-sensitive adhesive layer can be formed by a known layer forming method such as a coating method using a pressure-sensitive adhesive composition made of these resins and the like. The pressure-sensitive adhesive layer may be directly formed on the infrared reflective pattern printing surface. After the pressure-sensitive adhesive layer is formed on the release surface of the release sheet, the pressure-sensitive adhesive layer-side release sheet is formed on the surface of the infrared reflective pattern. Lamination may be performed with a pressure roller or the like. In the case of direct formation, the release sheet may be laminated on the surface of the adhesive layer once, and then peeled off when pasting with another surface base material. You may do it.

The transparent resin layer may be an adhesive layer having adhesiveness. In this case, there is an advantage that it is easy to mount the infrared reflective pattern printing sheet on the front surface of the display device. Similarly to the adhesive layer, it can also be used to integrate with functional layers such as various filters within a range not impairing the infrared reflection function.
The adhesive layer is not particularly limited as long as transparency can be obtained in the same manner as the adhesive layer, and a known adhesive may be appropriately employed. Examples of the adhesive include urethane adhesives, acrylic adhesives, epoxy adhesives, and rubber adhesives. Among them, urethane adhesives are preferable in terms of adhesive strength and the like. Such urethane adhesives include two-component curable urethane resin-based adhesives, and two-component curable urethane resin-based adhesives include various hydroxyl groups such as polyether polyol, polyester polyol, and acrylic polyol. It is an adhesive using a two-component curable urethane resin containing a containing compound and various polyisocyanate compounds such as tolylene diisocyanate and hexamethylene diisocyanate.
The adhesive layer can be formed by a known layer forming method such as a coating method using an adhesive composition composed of these resins and the like. The adhesive layer may be formed directly on the infrared reflective pattern printing surface, may be formed on the bonding surface of the surface substrate to be bonded, or formed on both the transparent pattern printing surface and the bonding surface of the surface substrate. May be. Adhesion becomes possible by laminating these substrates with the pressure roller or the like with the surfaces to be bonded facing each other.

In the infrared reflection pattern printed transparent sheet of the present invention, the transparent layer or the transparent resin layer may have a function of a hard coat layer (surface protective layer). The transparent pattern can be protected in the process of manufacturing and transporting the transparent sheet.
In this case, the material of the transparent resin layer is preferably three types: the ionizing radiation curable resin, a mixture of the ionizing radiation curable resin and a solvent-soluble thermoplastic resin, or the thermosetting resin. More preferably, it is made of a radiation curable resin.
Further, in the mixture of the ionizing radiation curable resin and the solvent-soluble thermoplastic resin, coating film defects on the coated surface can be effectively prevented by adding the thermoplastic resin. When the material of the transparent substrate is a cellulose resin such as TAC, preferred specific examples of the thermoplastic resin include cellulose resins such as nitrocellulose, acetyl cellulose, cellulose acetate propionate, and ethyl hydroxyethyl cellulose.

The infrared reflective pattern printed transparent sheet of the present invention preferably satisfies the following formula (A).
| N ₁ −n ₃ | >> | n ₁ −n ₂ | (A)
(N ₁ : refractive index of transparent pattern (= refractive index of infrared reflecting material), n ₂ : refractive index of transparent layer, n3: refractive index of air (= about 1.00))
If the transparent sheet satisfies the formula (A), the refractive index difference between the dot pattern and the surrounding air layer is reduced, and the dot pattern visualization due to the lens effect of the dot pattern is reduced. Although the effect is obtained, it is preferable that the difference between the refractive index of the transparent pattern and the refractive index of the transparent layer is smaller.
| N ₁ −n ₂ | ≦ 0.14 (B)

The display device to which the infrared reflective pattern printed transparent sheet of the present invention is attached may be connected to an information processing device for processing handwritten input data, or may be independent. It is preferable because the locus of time can be displayed on the screen and intuitive input is possible.
Examples of information processing apparatuses that handle handwritten input information include various portable terminals such as mobile phones and PDAs, personal computers, videophones, televisions having an intercommunication function, and Internet terminals.

As shown in FIG. 1, the input terminal 6 that can be used in the present invention is not particularly limited as long as it emits infrared rays i and can detect the reflected light r of the pattern, and a known sensor may be used. For example, as an example in which the pen-type input terminal 6 also includes the read data processing device 7, as disclosed in Japanese Patent Application Laid-Open No. 2003-256137, a pen tip that does not include ink, graphite, or the like, a CMOS that includes an infrared irradiation unit Examples include a camera, a processor, a memory, a communication interface such as a wireless transceiver using Bluetooth technology, and a device incorporating a battery.
As the operation of the pen-type input terminal 6, when the pen tip is drawn so as to be in contact with the back surface of the printed surface on which the transparent pattern as shown in FIG. 3 is printed, the pen-type input terminal 6 is added to the pen tip. The pen pressure is detected, the CMOS camera is activated, and a predetermined range in the vicinity of the pen tip is irradiated with infrared light having a predetermined wavelength emitted from the infrared irradiation unit, and a pattern is imaged (pattern imaging is performed several times per second, for example). 10 to 100 times). When the pen-type input terminal 6 includes the read data processing device 7, the captured pattern is analyzed by the processor, so that the time change of the position coordinate of the pen tip accompanying the movement of the pen tip during handwriting, that is, the input locus is obtained. The input trajectory data is generated by digitization and data generation, and the input trajectory data is 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 transmit the read data wirelessly using radio waves, infrared rays, or the like, even if it is connected to the read data processing device 7 with the code 8. When the read data processing device 7 is installed separately from the pen-type input terminal 6 as described above, the power can be supplied from commercial AC power.
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 in real time on the display device as if it were written with a pen on paper.

As described above, the infrared reflective pattern-printed transparent sheet of the present invention can be mounted on an existing display device as it is, and is thinner and lighter than a position input device such as an electrostatic type or a pressure-sensitive type incorporated in the display device. In addition, the manufacturing can be simplified, and almost no moire occurs when the display device is mounted. In the infrared reflection pattern-printed transparent sheet of the present invention, a transparent substrate is interposed between the printed infrared reflection pattern and the input terminal. For this reason, even if the input is repeated, the infrared reflection pattern is not worn by the contact of the input terminal (pen nib). Even if the function of providing location information is reduced because the transparent substrate becomes thin or scratched, it is only necessary to replace the transparent sheet, so the cost is low and it is handled by the user. It will be easy.
The infrared reflective pattern-printed transparent sheet of the present invention can be used as a liquid crystal protective sheet when mounted on a liquid crystal display.

The infrared reflective pattern printed transparent sheet of the present invention can be detachably attached to the front surface of the display device. In this way, not only one display device but also another display device can be appropriately moved, switched, and mounted as necessary. Further, it is preferable that the transparent sheet itself is provided with a mounting means for the display device so that the transparent sheet can be mounted on the display device side without performing processing for mounting. The mounting means may be provided integrally with the transparent 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. Further, examples of the sticking tool include those having adhesiveness or tackiness integrally attached to the transparent sheet, and those including an adhesive or pressure sensitive adhesive directly applied to the contact surface.

In order to improve the convenience of manufacturing the infrared reflective pattern printed transparent sheet of the present invention, it is preferable that the transparent sheet is separable. 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 sets several predetermined sizes. This is because a manufactured 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. Further, by using a plurality of transparent sheets having different coordinate ranges for one input device, different meanings can be given to the respective transparent 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
(1) Preparation of infrared reflective reflective coating solution A polymerizable acrylate structure at both ends, a mesogenic structure at the center, a spacer between the acrylate, and a nematic-isotropic transition temperature of 110 ° C. 100 parts by weight of a monomer (having the molecular structure shown by the compound (11), average refractive index n ₁ = 1.56) and a chiral agent having a polymerizable acrylate at both ends (the above chemical formula (12 A cyclohexanone (hereinafter abbreviated as anone) solution having 3.3 parts by mass dissolved in anone was prepared. Note that 4 parts by mass of a photopolymerization initiator (manufactured by BASF Japan Ltd., Lucillin (registered trademark) TPO) was added to the anone solution.

(2) Printing of dot pattern A hydroxyethyl cellulose (HEC) solution dissolved in pure water so that the concentration becomes 2% by mass was converted into a transparent triacetyl cellulose (TAC) film (thickness 80 μm, 桍 as a transparent substrate by bar coating). The transparent substrate with the alignment film was produced by coating the film on the surface and drying and forming a film at 100 ° C. (film thickness: 0.2 μm). On the obtained substrate, a dot pattern was printed by a gravure printing method using the above-described coating liquid for infrared reflection pattern as an ink. Next, simultaneously with drying by heating, the cholesteric phase transition of the liquid crystal was advanced.
Then, the printed matter is irradiated with ultraviolet rays, and the monomer molecule and the acrylate of the chiral agent are three-dimensionally cross-linked by radicals generated from the photopolymerization initiator in the coating film to form a transparent disk-like shape in the rectangular region (however, As shown in the plan view of FIG. 3, a transparent sheet was produced in which each dot was shifted from the square lattice point by a predetermined coordinate and arranged two-dimensionally. The film thickness of the pattern at this time was about 4 μm, and the dot size was about 100 μm in the diameter of the disk. The average dot interval was about 300 μm.
The printed dot pattern has a coordinate system (right-handed system / left-handed system) of coordinate information provided when first viewed from the printed surface side, and is a coordinate system (viewed from the input terminal side of the image display surface of the display device). The pattern was designed to be the same as that of the right-handed / left-handed system, and further mirrored as it was.

  When the pattern printing surface of this transparent sheet was read with a pen-type sensor that irradiates infrared rays and detects the reflected light as an image, a reflection pattern by infrared reflection dots could be detected. The recognized coordinate system is set in advance on the image display surface of the display device, and the relationship between the mirror image right-handed system / left-handed system is reversed from the coordinate system programmed in the read data processing device. Further, even when the transparent sheet was turned upside down and read through the transparent substrate from the side opposite to the pattern printing surface, the reflection pattern could be detected with the same sensitivity as from the front side. However, in this case, the recognized coordinate system is set in advance on the image display surface of the display device, and the relationship between the coordinate system programmed in the read data processing device and the left-handed / right-handed coordinate system is the same. It was something.

Example 2
(3) Preparation of adhesive layer forming coating solution The adhesive layer forming coating solution is an acrylic resin adhesive (manufactured by Soken Chemical Co., Ltd., SK Dyne 2094: solid content 25.0%, solvents are ethyl acetate and methyl ethyl ketone). A ratio of 0.5 parts by mass of a crosslinking agent (manufactured by Soken Kagaku, E-5XM) and 60 parts by mass of a diluent (toluene / methyl ethyl ketone / cyclohexanone = 6/6/1, mass ratio) with respect to 200 parts by mass It was blended and prepared.

(4) Formation of adhesive layer The adhesive layer forming coating solution prepared in (3) above was applied to the pattern printed surface of the infrared reflective pattern transparent sheet prepared in Example 1 and dried using a table coater. A layer was formed. The mass of the adhesive layer was about 28 g / m ² . In order to temporarily protect the adhesive layer, a release sheet (manufactured by Teijin DuPont, Purex A31, thickness 38 μm) was bonded to the adhesive layer surface to prepare an infrared reflective pattern transparent sheet with an adhesive layer.
After this transparent sheet with an adhesive layer was cut into a rectangle of a predetermined size, the release sheet was peeled off and attached to the image display surface of the liquid crystal display. At this time, the dot pattern printing surface (adhesive layer side) faces the image display surface of the liquid crystal display. When the surface of the infrared reflective pattern transparent sheet (the back side of the pattern printing surface) affixed to the front of the display is read with a pen-type sensor that irradiates infrared rays and detects the reflected light as an image, The reflection pattern could be detected. Further, when this transparent sheet was superimposed on the front surface of the liquid crystal display displaying an image, almost no moire was visible.

As described above in detail, the infrared reflective pattern-printed transparent sheet of the present invention is a member that provides coordinate detection means that can be applied to a data input system of a type in which handwriting is directly performed on the screen of a display device, and has a work space. In addition to being able to reduce, it is lightweight, inexpensive, easy to increase in area, can be mass-produced, and the infrared reflection pattern is not in direct contact with the input terminal, so it is extremely high against repeated input terminal contact Has strength. Furthermore, by providing a transparent layer, the lens effect of the transparent pattern is reduced, and even when there is unevenness due to irregularities on the surface of the transparent pattern, it is reduced, so almost no moire occurs when it is mounted on a display device. do not do. In particular, when the transparent layer is an adhesive layer, it can be easily attached to and detached from the display device.
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 the schematic of the whole system using the infrared reflective pattern printing transparent sheet of this invention. It is a conceptual diagram which shows the relationship between the coordinate system of the infrared reflective pattern printing transparent sheet of this invention, and the coordinate system of a display apparatus. It is a principal part enlarged plan view which shows the example in which the dot pattern was irregularly arranged in the infrared reflective pattern printing transparent sheet of this invention. It is sectional drawing which shows one embodiment of the infrared reflective pattern printing transparent sheet of this invention. It is sectional drawing which shows another one embodiment of the infrared reflective pattern printing transparent sheet of this invention. It is sectional drawing which shows another one embodiment of the infrared reflective pattern printing transparent sheet of this invention. It is sectional drawing which shows another one embodiment of the infrared reflective pattern printing transparent sheet of this invention. It is sectional drawing which shows the infrared reflective pattern printing transparent sheet in a prior art.

Explanation of symbols

1: Infrared reflective pattern printing transparent sheet (transparent sheet)
2: Transparent substrate 3: Transparent pattern 4: Alignment film 5: Display device 6: Input terminal (pen type)
7: Reading data processing device 8: Code 9: Transparent layer i: Infrared ray r: Reflected light

Claims (18)

  A transparent sheet having a printing surface formed by printing a transparent pattern having infrared reflective regularity on the surface of a transparent substrate, and the printing surface is mounted on the front surface of a display device capable of displaying an image. The ink constituting the transparent pattern includes a material that reflects infrared rays, and the transparent pattern irradiates infrared rays from the back side of the printed surface using an input terminal capable of irradiating and detecting infrared rays. The infrared reflective pattern printing transparent sheet which can provide the information regarding the position of the input terminal on a transparent sheet by reading.   The relationship between the right-handed system and the left-handed system of the coordinate system is the coordinate system of coordinate information provided when seen through the transparent substrate from the back side of the printing surface and the coordinate system of the image display surface of the display device. The infrared reflection pattern printed transparent sheet according to claim 1, wherein   The infrared reflective pattern-printed transparent sheet according to claim 1 or 2, wherein the material that reflects infrared rays is a liquid crystal material having a fixed cholesteric structure having wavelength selective reflectivity with respect to wavelengths in the infrared region.   The infrared reflection pattern printed transparent sheet according to claim 1 or 2, wherein the material that reflects infrared rays contains an infrared reflection pigment.   The infrared reflection pattern printed transparent sheet according to any one of claims 1 to 4, wherein the transparent pattern has a selective reflection peak wavelength at 800 nm to 950 nm.   The infrared reflection pattern printed transparent sheet according to claim 1, wherein the transparent pattern is a dot pattern.   The infrared reflecting pattern-printed transparent sheet according to any one of claims 1 to 6, wherein a transparent layer is formed on the surface of the transparent substrate so as to have substantially the same thickness as the transparent pattern or a thickness covering the transparent pattern. .   In the case where a transparent layer is formed on the surface of the transparent substrate with substantially the same thickness as the transparent pattern, (thickness of transparent pattern) − (thickness of transparent layer) is 0.15 μm or less. The infrared reflective pattern printing transparent sheet of Claim 7.   The infrared reflective pattern printed transparent sheet according to claim 7 or 8, wherein the transparent layer is a transparent resin layer in which crosslinking is formed by ionizing radiation.   The infrared reflecting pattern-printed transparent sheet according to any one of claims 7 to 9, wherein the transparent layer is an adhesive layer or an adhesive layer. The infrared reflective pattern printing transparent sheet in any one of Claims 7-10 which satisfy | fills following formula (A).
| N ₁ −n ₃ | >> | n ₁ −n ₂ | (A)
(N ₁ : refractive index of transparent pattern, n ₂ : refractive index of transparent layer, n ₃ : refractive index of air) The infrared reflective pattern printing transparent sheet in any one of Claims 7-11 which satisfy | fills following formula (B).
| N ₁ −n ₂ | ≦ 0.14 (B)
(N ₁ : refractive index of transparent pattern, n ₂ : refractive index of transparent layer)   The thickness of the said transparent pattern is 1-20 micrometers, The infrared reflective pattern printing transparent sheet in any one of Claims 1-12.   The infrared reflective pattern printing transparent sheet in any one of Claims 1-13 which have an at least 1 layer of functional layer in the back side of the printing surface of the said transparent substrate.   The infrared reflective pattern printed transparent sheet according to claim 14, wherein the functional layer is at least one selected from a hard coat layer, an antireflection layer, and an antiglare layer.   The infrared reflection pattern printed transparent sheet according to any one of claims 1 to 15, further comprising mounting means for mounting on the display device.   The infrared reflective pattern printing transparent sheet according to claim 16, wherein the mounting means is a sticking tool that is provided on a contact surface side in contact with the display device and has adhesiveness or adhesiveness for sticking to the display device.   The infrared reflecting pattern-printed transparent sheet according to any one of claims 1 to 17, which is separable.

Images