JP2009037313A - Pattern print transparent sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pattern print transparent sheet which can be suitably used for providing additional information to an image display medium just like directly handwriting and inputting data to a display device not by making it necessary for a user to attach the sheet having such a function afterwards, but by integrating the sheet from the beginning. <P>SOLUTION: This surface film for a polarizer is configured by printing a transparent pattern having the regularity of invisible beam reflexibility on the surface of a substrate, and forming a reflection prevention layer or an antidazzle layer on this or on the back face, wherein ink configuring the transparent pattern contains materials on which the invisible beam is reflected. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to 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 particularly relates to a pattern-printed transparent sheet having a wide reading angle range.

  In recent years, there is an increasing need to convert handwritten characters, pictures, and the like into electronic data that can be handled by an information processing apparatus. Correspondingly, for example, as position information for indicating the position of the input locus, it is conceivable to combine information printed with a pattern reflecting infrared rays or ultraviolet rays which are invisible rays.

By the way, as an apparatus for reading position information with a pen-type sensor or the like and inputting it to an image display apparatus of an information processing device, for example, Patent Document 1 discloses a transparent sheet attached to the front surface of a display apparatus, A mark that can provide position information for indicating the position of an input locus by a pen or the like 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. ing.
Patent Document 2 discloses a coordinate input device using a transparent member printed with special ink that reflects an infrared region.
However, Patent Documents 1 and 2 do not exemplify specific transparent sheets, and merely describe ideas or desires for transparent sheets.

  Therefore, the present inventors use a cross-linked solidified cholesteric liquid crystal as a printing ink for such coordinate input lattice points, and by setting the selective reflection wavelength of the cholesteric liquid crystal layer in the infrared region, it is transparent for visible light and A coordinate input sheet capable of inputting a pen drawing trajectory with infrared rays was invented, and patent applications were filed (Japanese Patent Application Nos. 2006-150121 and 2006-269220). However, as a result of further diligent studies, as a new problem, there is generally an alignment layer for aligning liquid crystals below the cholesteric liquid crystal layer. By applying an alignment treatment such as rubbing treatment to the alignment layer, the cholesteric liquid crystal Draw a beautiful helix and align and orient so that the helix axis is perpendicular to the substrate plane. Here, when the spiral axes are aligned vertically across the substrate plane (that is, each film surface of the multilayer structure is a parallel plane group), when reading with a pen, this type of input pen is recursive. Since only the reflection component can be detected, reading is performed only in the 0 ° (vertical) direction. It was found that the detection sensitivity drastically decreased when the input pen was tilted slightly. When reading with such a pen, the user side is expected to hold various pens, and thus a wide reading angle is required.

Japanese Patent Laid-Open No. 2003-256137 JP 2001-243006 A

  The present invention has been made to solve the above-described problems, and an object thereof is to provide an infrared reflective pattern-printed transparent sheet having a wide reading angle.

As a result of intensive studies to achieve the above object, the present inventors have obtained a transparent sheet in which an infrared reflective transparent pattern is printed on the surface of a transparent substrate, and the transparent pattern has a specific wavelength. It has been found that the above problem can be solved by controlling the half-value width of the reflection wavelength when irradiated with infrared rays to a specific range. The present invention has been completed based on such findings.
That is, the present invention is a transparent sheet in which an infrared-reflective transparent pattern is printed on the surface of a transparent substrate, and the ink constituting the transparent pattern is an infrared ray having wavelength selective reflectivity with respect to wavelengths in the infrared region. A pattern-printed transparent sheet comprising a reflective material, wherein the transparent pattern has a half-value width of 40 to 150 nm when the infrared ray of 850 nm is irradiated at an incident angle of 5 degrees,
Is to provide.

  According to the present invention, an infrared reflective pattern-printed transparent sheet having a wide reading angle can be provided.

The pattern-printed transparent sheet of the present invention is a transparent sheet in which an infrared reflective transparent pattern is printed on the surface of a transparent substrate, and the ink constituting the transparent pattern is wavelength selective reflective with respect to wavelengths in the infrared region. An infrared reflective material having a wavelength of 850 nm is used, and a half-value width of a reflected wavelength when an infrared ray of 850 nm is irradiated at an incident angle of 5 degrees is 40 to 150 nm. Hereinafter, in the present invention, when simply referred to as “half-value width of reflection wavelength”, it refers to the half-value width of the reflection wavelength when 850 nm infrared light is irradiated at an incident angle of 5 degrees.
In general, when an infrared reflective material having wavelength selective reflectivity with respect to wavelengths in the infrared region, such as cholesteric liquid crystal, is used as the ink constituting the transparent pattern, the reflected wavelength is Bragg when the incident angle of light is θ. It is known that the reflection type shifts to the short wavelength side by sin θ. For example, assuming a case in which an input pen equipped with a CCD camera is used as a reading function, the larger the incident angle of infrared rays, that is, the greater the inclination of the input pen, the larger the value of sin θ and the reflected wavelength in the visible region. Shift to the side.

The reflected light has a wavelength distribution. When the wavelength of the reflected light (reflection wavelength) is taken on the horizontal axis and the intensity is taken on the vertical axis, the reflected light has a peak shape having a certain half width. The pattern-printed transparent sheet of the present invention has a half-width of the reflection wavelength in the range of 40 to 150 nm when the transparent pattern is irradiated with infrared light of 850 nm as incident light at an incident angle of 5 degrees.
If the half-value width of the reflection wavelength is less than 40 nm, when the inclination of the input pen is increased, that is, when the incident angle of infrared rays is large and sin θ is large, the CCD camera equipped in the input pen has the highest sensitivity. Since the peak is shifted from the wavelength range of 800 to 900 nm, the reflected light may not be recognized. On the other hand, when the half-value width of the reflected wavelength is 40 nm or more, even if the reflected light is shifted to the short wavelength side with respect to the incident light, the wavelength range of 800 to 900 nm can be covered. Light can be recognized and a high viewing angle can be obtained.
On the other hand, when the half-value width of the reflection wavelength exceeds 150 nm, the reflected light may include visible light, which causes inconvenience that coloring or moire occurs.
From the above viewpoint, the half-value width of the reflection wavelength when the transparent pattern is irradiated with infrared rays of 850 nm at an incident angle of 5 degrees is more preferably in the range of 50 to 150 nm.
In the present invention, the half-value width of the reflection wavelength means a peak spread width at one half of the reflection wavelength peak height. The reflection wavelength is measured with a normal spectrophotometer.

In the pattern printed transparent sheet of the present invention, there are various methods for controlling the half width of the reflection wavelength, in addition to the method for controlling the composition for forming the primer layer constituting the transparent substrate, which will be described in detail later. (1) A method of laminating two or more types of liquid crystals, (2) a method of using cholesteric liquid crystals exhibiting a large value of Δn (in-plane birefringence index perpendicular to the helical axis of the liquid crystals), (3) pattern-printing transparent sheet Control in the manufacturing process.
(1) The method of laminating two or more types of liquid crystals is a method of laminating two or more types of cholesteric liquid crystals having different center wavelengths of transmitted light. More specifically, by stacking cholesteric liquid crystals with the same rotation and different helical pitches, the half-value width of the reflection wavelength can be expanded.

(2) It is known that the half width of the selective reflection wavelength depends on Δn, and a method using a cholesteric liquid crystal showing a large value of Δn is effective. Specifically, a method of obtaining a cholesteric liquid crystal by using a polymerizable rod-shaped nematic liquid crystalline compound having Δn of 0.25 or more and mixing it with a chiral agent (for example, JP-A No. 2000-281629), etc. Are known.
(3) As a control in the production process of the pattern-printed transparent sheet, a method of heating the cholesteric liquid crystal layer (for example, see JP-A-1-207328) or a curing with ultraviolet rays is usually performed in a nitrogen atmosphere. There are methods such as performing in an air atmosphere.

Next, the layer configuration of the pattern-printed transparent sheet of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing an embodiment of the pattern-printed transparent sheet of the present invention, which has a dot shape in which an infrared reflective transparent pattern is formed by dot printing.
The transparent substrate 2 used in the pattern-printed transparent sheet 1 of the present invention is preferably composed of a base material 21 and a primer layer 22. The transparent pattern 3 is printed on the surface of the primer layer 22, and the primer layer 22 has a transparent pattern. It preferably comprises a primer composition that repels the constituent ink. The transparent pattern 3 is formed as a dot pattern by dot printing. Here, the primer layer 22 has a function of repelling each droplet of the transparent pattern 3 during dot printing. These droplets rise as a result of being repelled, have a large curvature, and have the effect of widening the half-value width of the reflection wavelength. Therefore, by specifying the composition of the primer composition constituting the primer layer within a certain range, the half-value width of the reflected wavelength can be controlled within the range of 40 to 150 nm. The specific composition of the primer composition will be described in detail later.

The base material 21 of the transparent substrate 2 used for the transparent sheet 1 of the present invention is not particularly limited as long as it is a material that transmits visible light, but is preferably formed of a material with few optical defects. A so-called film, sheet, or plate is appropriately used. In addition to a flat surface, a curved surface shape may be used so as to match the curved surface of the display surface. Specifically, as the material of the base material 21, glass, TAC (triacetyl cellulose), PET (polyethylene terephthalate), polycarbonate, polyvinyl chloride, acrylic, polyolefin, or the like is preferably used. Further, the thickness is usually in the range of about 20 to 5000 μm, and preferably in the range of 100 to 5000 μm from the viewpoint of anti-curl properties described in detail later, and is appropriately selected according to the material, required performance, and usage form.
In the case of using a material that easily dissolves or swells in a solvent such as a polymer film such as a TAC film as the base material 21, the substrate is not attacked by the solvent in the coating liquid used for printing the transparent pattern 3. A barrier layer may be provided on the substrate 21. For example, a water-soluble substance such as PVA (polyvinyl alcohol) or HEC (hydroxyethyl cellulose) may be used as the barrier layer.

  The material used for the primer composition constituting the primer layer 22 of the transparent substrate 2 according to the present invention is a substance having the property of repelling ink droplets constituting the transparent pattern, and the reflection wavelength has a half width of 40. It is important to select one that takes a range of ˜150 nm. 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 in the primer composition is not particularly limited as long as it satisfies the above requirements, and examples thereof include thermoplastic resins, thermosetting resins, and ionizing radiation curable resins. Among these, from the viewpoints of durability, solvent resistance, and a sufficient half-width of the reflection wavelength, and a wide reading angle, a resin that is cured by crosslinking is preferable. An ionizing radiation curable resin that can be crosslinked in a short time by ionizing radiation such as a wire is more preferable. In the case where these resins themselves do not have sufficient liquid repellency with respect to the transparent pattern forming ink and the half width of the reflection wavelength is less than 40 nm, it is preferable to further add a liquid repellency leveling agent.

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, 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.

As described above, the material used for the primer composition is preferably an ionizing radiation curable resin, and various reactive monomers and / or reactive oligomers are preferably used. For example, the reactive monomer includes a polyfunctional (meth) acrylate monomer. Examples of reactive oligomers include oligomers having radically polymerizable unsaturated groups in the molecule, such as epoxy (meth) acrylate, urethane (meth) acrylate, polyester (meth) acrylate, and polyether (meth) acrylate. Can be mentioned. Here, (meth) acrylate refers to acrylate or methacrylate.
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.

  Examples of the polyfunctional (meth) acrylate monomer include ethylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate, 1,4-butanediol di (meth) acrylate, and 1,6-hexanediol diene. (Meth) acrylate, neopentyl glycol di (meth) acrylate, polyethylene glycol di (meth) acrylate, hydroxypivalic acid neopentyl glycol di (meth) acrylate, dicyclopentanyl di (meth) acrylate, caprolactone modified dicyclopentenyl di (Meth) acrylate, ethylene oxide-modified phosphoric acid di (meth) acrylate, allylated cyclohexyl di (meth) acrylate, isocyanurate di (meth) acrylate, trimethylolpropane tri (meth) acrylate , Ethylene oxide modified trimethylolpropane tri (meth) acrylate, dipentaerythritol tri (meth) acrylate, propionic acid modified dipentaerythritol tri (meth) acrylate, pentaerythritol tri (meth) acrylate, propylene oxide modified trimethylolpropane tri (Meth) acrylate, tris (acryloxyethyl) isocyanurate, propionic acid modified dipentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate, ethylene oxide modified dipentaerythritol hexa (meth) acrylate, caprolactone modified dipenta Examples include erythritol hexa (meth) acrylate.

The liquid repellent leveling agent used in the primer composition according to the present invention is not particularly limited as long as it repels the ink that forms the transparent pattern 3 and the reflection wavelength has a half-value width of 40 to 150 nm. As the type of the leveling agent, various compounds such as silicone, fluorine, polyether, acrylic acid copolymer and titanate can be used.
In the case of using a liquid crystal material having a cholesteric structure fixed to an ink for forming a transparent pattern, which is a preferred embodiment of the present invention, in particular, an acrylic acid copolymer type leveling agent (for example, trade name, manufactured by Big Chemie) “BYK361”) is preferred. The addition amount is not particularly limited as long as the half-value width of the reflection wavelength can be in the range of 40 to 150 nm, and may be appropriately adjusted according to a desired reading angle. When the resin itself selected as the material for the primer composition already has sufficient liquid repellency as the transparent pattern forming ink, the addition of the liquid repellency leveling agent can be omitted. Examples of the resin having high liquid repellency include silicon resin and fluorine resin.

In addition to adding the above-mentioned leveling agent (liquid repellent material) in the primer layer 22 from the viewpoint of increasing the half-value width of the reflection wavelength and obtaining a wide reading angle, fine particles may be added. Good.
As the fine particles, those usually used can be added in an appropriate amount without any particular restriction. For example, inorganic particles include transparent particles such as α-alumina, silica, kaolinite, glass, calcium carbonate, diamond, silicon carbide and the like. Examples of the particle shape include a sphere, a spheroid, a polyhedron, a truncated polyhedron, and a scaly shape, and are not particularly limited, but a spherical shape is preferable. Organic materials include synthetic resin beads such as cross-linked acrylic resin and polycarbonate resin. Among these, α-alumina and silica are preferable and spherical ones are particularly preferable because they are highly transparent and easily obtain spherical particles. The particle diameter of the fine particles is about 50 μm to 5 mm. Alternatively, the surface of the transparent pattern 3 is curved to a curved surface convex upward (for example, a curved surface such as a hemispherical surface), or fine irregularities are formed on the surface of the transparent pattern by embossing to increase the half-value width of the reflected wavelength. You can also.

  Further, in the primer layer 22, if necessary, the transparent pattern 3 in the present invention has a non-visible light reflection function, a moire preventing effect, and a transparency that does not hinder the transparency. You may add suitably the well-known various additives in ink. 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 primer layer 22 can be formed of a primer composition ink obtained as described above by a known layer forming method such as a coating method or a printing method. Specifically, the substrate 21 may be formed 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 addition, the thickness of the primer 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.

Next, the ink constituting the infrared reflective transparent pattern in the present invention includes an infrared reflective material having wavelength selectivity with respect to wavelengths in the infrared region, and the infrared reflective material exhibits a fixed cholesteric structure. A liquid crystal material is preferred.
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 polymerizable monomer or polymerizable oligomer having an acrylate structure as a polymerizable functional group.
The liquid crystal in the narrow sense refers to a fluid liquid material having optical anisotropy, but in the present invention, in the case of a liquid crystal, in addition to this, such a liquid narrow sense liquid crystal is polymerized, cooled, etc. It is also used in the meaning of including those fixed while maintaining optical anisotropy.

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%) at least at some wavelengths in the infrared region. High transmittance is not necessarily required at a wavelength of. This is because 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 increased and the transmitted light from there is used, the transparent material This is because the desired transparency can be obtained for the entire pattern. However, it is needless to say that the liquid crystal material itself has a higher visible light transmittance. In general, when a liquid crystal material having such a cholesteric structure brings a high reflection wavelength region to a non-visible light region, a visible light of about 70% or more in a thickness of about several μm in the visible light region. Get the transmittance. On the other hand, in the infrared region, it is common to obtain a high reflectance of about 5 to 50%.
The temperature range in which the polymerizable liquid crystal material exhibits a cholesteric phase is not particularly limited as long as the polymerizable liquid crystal material can be fixed in the state of the cholesteric phase. This is preferable because the drying process during printing and the phase transition of the liquid crystal can be performed simultaneously.

If it is the above materials, a liquid crystal molecule can be optically fixed in the state of a cholesteric liquid crystal, and a pattern which is easy to handle as a sheet and which is stable at room temperature can be formed.
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. In the same way, these materials can also be used to optically fix liquid crystal molecules in the form of cholesteric regular liquid crystals, and form a stable pattern at room temperature that is easy to handle as an optical film. Because you can.
A method for forming a cholesteric liquid crystal is also described in JP-A Nos. 2001-5684 and 2001-110045.

  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), X1 is 2 to 5 (integer). ]

  Examples of the liquid crystal polymer include 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 rays 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. For example, anone (cyclohexanone), cyclopentanone, toluene, acetone, MEK (methyl ethyl ketone), MIBK (methyl) can be used. 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.

For the transparent pattern 3 used in the present invention, for example, a material that selectively reflects one of the left circularly polarized light component and the right circularly polarized light component with respect to incident light can be used. In particular, when a cholesteric liquid crystal material is used and the transparent pattern 3 is formed so as to have a fixed cholesteric structure, the left-handed or right-handed cholesteric liquid crystal material is selected for incident light. A circularly polarized light component in a desired rotational direction (a circularly polarized light component whose electric field vector rotates in the same direction as the rotational direction of the helical axis of the cholesteric liquid crystal) can be selectively reflected, which is preferable.
In general, "liquid crystal" refers to a liquid state in a narrow sense, but in the specification of the present invention, a liquid crystal material having fluidity is held by liquid crystal by means such as cross-linking and cooling. A liquid crystal that is solidified and maintained in a non-flowing state while maintaining desired performance such as optical characteristics, refractive index, and anisotropy is also referred to as “liquid crystal”.

  When circularly polarized light is incident, the rotation direction of the circularly polarized light component reflected on the surface of the transparent substrate made of a normal material such as resin or glass is reversed. On the other hand, on the surface of the cholesteric liquid crystal, the circularly polarized component of the light reflected from the surface remains unchanged with the rotation direction unchanged. Therefore, if this property is used, the SN ratio of the reflected light from the non-visible light reflective transparent pattern 3 and the background light (reflected light from other than the pattern portion) can be improved by combining with a circular polarizing filter or the like. Is possible.

  In the case of reflection with a cholesteric structure, the reflection intensity generally increases as the printing thickness (film thickness) increases, but if it is too thick, the liquid crystal orientation is unnecessarily disturbed, the transparency is lowered, and the drying load is increased. The printed thickness of the pattern 3 is usually about 1 to 20 μm, preferably about 3 to 15 μm. In terms of the number of helical pitches of the cholesteric liquid crystal structure, the reflectance is said to be saturated at about 10 to 20 pitches. However, if the liquid crystal composition and the solidification conditions are determined, the film in which the reflection intensity is saturated in actual production. The thickness may be obtained experimentally to optimize the reflectivity. It should be noted that even if the film thickness is more than the above (or the number of pitches), it can be said only from the point of reflectivity, but if the film thickness becomes thicker than necessary, the printed pattern is likely to be worn and damaged, and the manufacturing cost is more than necessary. In order to increase the thickness, it is preferable to set the film thickness to the minimum necessary level.

  Next, the infrared reflective pigment applicable to the pattern-printed transparent sheet of the present invention will be described. An 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. It is a near-infrared reflective colored 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 or a metal having a high solar reflectance exhibiting heat ray reflection performance. Powdered pigments, specifically titanium oxide (TiO ₂ ), zinc oxide, zinc sulfide, lead white, antimony oxide, zirconium oxide, tin oxide, tin-doped indium oxide (ITO), inorganic metal oxides such as tin-doped antimony oxide Powder, metal powder 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 the ink used for the transparent pattern, it is used as a composite metal oxide having plural kinds 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 pattern 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 may be a known one. 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.

  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.

  In the pattern-printed transparent sheet of the present invention, the printing method of the transparent pattern is not particularly limited, and a known method can be used. For example, a flexographic printing method, a gravure printing method, a stencil printing method, an ink jet printing method, etc. Can be mentioned.

  In the pattern-printed transparent sheet of the present invention, although not necessarily required, when a liquid crystal material is used as the transparent pattern, an alignment film is provided between the substrate and the transparent pattern in order to stabilize the liquid crystal alignment. It is preferable to keep it. 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 an oriented film to a board | substrate.

  The transparent pattern 3 includes a multi-layer structure (also referred to as a multi-layer film structure) in which the transparent pattern 3 has a constant repetition period when a cross section cut by a plane orthogonal to the transparent substrate 2 is observed with a scanning electron microscope. Is preferable for ensuring infrared reflectivity.

As shown in FIG. 2 and FIG. 3, the pattern-printed transparent sheet of the present invention has a transparent layer 4 formed on the transparent substrate 2 with substantially the same thickness as the transparent pattern 3 or a thickness covering the transparent pattern 3. Preferably it is.
When the transparent layer 4 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 4) is 0.15 μm or less. Thus, it is preferable that the space between the transparent patterns is filled. Further, even when the transparent layer 4 is formed with a thickness covering the transparent pattern 3, the uneven step on the surface of the transparent layer 4 preferably has a flatness of about 0.15 μm or less.
By doing so, moire (stripe) can be reduced. 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 an LCD 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.

  The material of the transparent layer 4 is not particularly limited, and various transparent materials such as a resin, a metal oxide, and glass can be used. In particular, an organic resin or an inorganic resin can be used because a layer can be formed by coating. A transparent resin layer such as a resin is preferred. Further, the transparent layer may have one or more functions other than the transparency, such as a hard coat layer, a pressure-sensitive adhesive layer, an adhesive layer, a shock absorbing layer, and various filter layers.

  The resin used for the transparent layer 4 is particularly limited as long as it is a transparent resin that has a sufficiently small difference in refractive index from the dot pattern as described later and has a sufficiently low reflectance of infrared rays used for reading compared to the dot pattern. In view of adhesion to the ink or the like forming the substrate 2 or the transparent pattern 3, a known resin may be appropriately employed. Specifically, a thermoplastic resin, a thermosetting resin, an ionizing radiation curable resin, and the like can be mentioned. Among these, from the viewpoint of durability, solvent resistance, and the like, a resin that is cured by crosslinking is preferable. Furthermore, 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. When the substrate is TAC, the thermoplastic resins include, for example, nitrocellulose, Cellulosic resins such as acetyl cellulose, cellulose acetate propionate, and ethyl hydroxyethyl cellulose are preferred.
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 of (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 be used.

  Moreover, when using the said ionizing radiation curable resin as an ultraviolet 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. Further, it is preferable to use a mixture of photosensitizers, and specific examples thereof include n-butylamine, triethylamine, tri-n-butylphosphine and the like.

Further, in the clearing layer, for example, various known additives and various pigments in coating liquids and inks may be added as needed in addition to the resin. 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. .
In addition to the resin, the clearing layer 4 is usually a known composition such as a coating method or a printing method using a composition containing a solvent and other additives, pigments, and the like as necessary. It can be formed by a layer formation method. Specifically, the transparent pattern 3 may be formed on the printed surface of the printed substrate 2 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.

  In addition, the transparent pattern 3 or the transparent layer 4 in the pattern-printed transparent sheet of the present invention is provided with a strength that can be withstood even if the input terminal is repeatedly touched when handwritten input is performed with a pen-type input terminal. Further, a hard coat layer may be provided. The material for the hard coat layer is not particularly limited, and those used in the field of ordinary 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.

Moreover, in the pattern-printed transparent sheet of the present invention, when a transparent layer having a thickness almost equal to or larger than that of a 6-8 μm transparent pattern is formed on a transparent substrate, the transparent layer is thick, In some cases, the curl becomes large, and when it is used by being attached to a display or other medium, the curl is large and it is difficult to attach to the screen. For this reason, the practical curl tolerance is 10 mm or less, preferably 5 mm or less.
The curl measurement method can be evaluated by cutting the center part of the sheet A4 size into a 10 cm square and calculating the average value of warping at the four corners.

As a method for reducing the curl, there is provided an anti-curl layer 5 having substantially the same thickness on the side opposite to the transparent layer (see FIG. 4) or increasing the thickness of the transparent substrate.
The thickness of the anti-curl layer 5 is preferably a transparent layer ± 5 μm or less. Moreover, as a material of the curl prevention layer 5, the same material as the transparent layer mentioned above is mentioned, It is preferable that it is the same. The anti-curl layer may be provided with, for example, antireflection, anti-slip, antistatic, antifouling, antiglare and the like.
Moreover, when increasing the thickness of the transparent substrate, the thickness of the transparent substrate is preferably 180 μm to 1 mm or less, and 400 μm or less in consideration of printing appropriateness such as gravure.

  The pattern-printed transparent sheet of the present invention is used for the purpose of providing various information (positional coordinates and the like) attached to an image. As this image display medium, media that display various types of image information are targeted. 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, and barcodes, and photographic images (landscapes, people, paintings, and other various types). And so on. As a specific image display medium, a liquid crystal display using a polarizing plate is preferably used.

In the pattern-printed transparent sheet of the present invention, the transparent pattern is set so that position information of the input terminal on the film surface can be derived from a partial pattern read by an input terminal equipped with a sensor. .
In the transparent pattern 3 in the present invention, 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, and thick lines of ruled lines arranged vertically and horizontally. The pattern is a combination of the sizes of overlapping portions of the ruled lines within a predetermined range, and the x and y coordinate values are directly linked to the vertical and horizontal sizes of the dots. As a particularly simple and preferred one, set reference points arranged at equal intervals in the vertical and horizontal directions, arrange dots displaced vertically and horizontally with respect to this reference point, and position these dots relative to the reference point. One way is to use relationships. This method is advantageous in increasing the resolution of the input device because the dot size can be made small and constant.

In the 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 intensity 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. The printing thickness is usually about 1 to 20 μm, preferably about 3 to 10 μm.
Moreover, when using an infrared reflective pigment as the infrared reflective material, the print thickness of the infrared reflective transparent 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 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 circle, an ellipse, a polygon, or the like. Also, there is no particular limitation on the three-dimensional shape of the dot. Usually, when the pen-type input terminal comes into contact with it, it slides smoothly without resistance, and the dot and the terminal are hardly damaged from each other. Although it is preferably a disc shape, it may be hemispherical, concave, or polygonal.

  Here, the information processing apparatus that handles handwritten input information is not particularly limited, and examples thereof include various portable terminals such as mobile phones and PDAs, personal computers, videophones, televisions having an intercommunication function, and Internet terminals. .

The input terminal 31 that can be used in the present invention is not particularly limited as long as it can emit infrared rays i and detect the reflected light r of the pattern as shown in FIG. For example, JP 2003-256137 A discloses an example in which the pen-type input terminal 31 also includes a read data processing device 32. Also included are pens that do not contain ink, graphite, etc., CMOS cameras equipped with infrared radiation units, processors, memories, communication interfaces such as wireless transceivers using Bluetooth technology, etc., and those with built-in batteries, etc. It is done.
As an operation of the pen type input terminal 31, when the pen tip is drawn so as to be traced by contacting the front surface of the pattern printing transparent sheet on which the transparent pattern 3 is printed as shown in FIG. Detects the writing pressure applied to the pen tip, and the CMOS camera operates to irradiate a predetermined range near the pen tip with invisible light of a predetermined wavelength emitted from the invisible light irradiation unit and to capture a pattern (pattern) Is taken, for example, from several tens to 100 times per second). If the pen-type input terminal 31 includes the read data processing device 32, 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 wireless transceiver using a processor, a memory, Bluetooth technology, and the like, and a member such as a battery are outside the pen-type input terminal 31 as a read data processing device 32 as shown in FIG. Also good. In this case, even if the pen-type input terminal 31 is connected to the read data processing device 32 with the code 33, the read data may be transmitted wirelessly using radio waves, invisible light, or the like.
In addition, the input terminal 31 may be a reader described in Japanese Patent Laid-Open No. 2001-243006.

The read data processing device 32 applicable in the present invention has a function of calculating position information from continuous imaging data read by the input terminal 31, 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.
The read data processing device 32 may be built in the input terminal 31 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 32 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.

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 coating solution for infrared reflective transparent pattern Polymerizable acryloyl group at both ends, mesogenic structure at the center, spacer between the acryloyl group and nematic-isotropic transition temperature of 110 ° C 100 parts by weight of a monomer (having the molecular structure represented by the compound (11), average refractive index n ₁ = 1.56) and a chiral agent having a polymerizable acryloyl group at both ends (the above chemical formula ( A cyclohexanone solution was prepared from 3 parts by mass having the molecular structure shown in 12). In this cyclohexanone solution, 4 parts by mass of a photopolymerization initiator (manufactured by BASF Japan Ltd., Lucyrin TPO), 0.054 parts by mass of a leveling agent (BIC Chemie, BYK-361N), and 0.02 A part by weight of a polymerization inhibitor (manufactured by Kanto Chemical Co., Inc., BHT; dibutylhydroxytoluene) was added.

(2) Preparation of coating solution for ink-repellent substrate 100 parts by mass of pentaerythritol triacrylate (PETA, Nippon Kayaku Co., Ltd., trade name KAYARAD PET-30) as a base solution, and a leveling agent having an acrylic skeleton ( BYC Chemie Co., Ltd., trade name BYK-361N) 0.06 parts by mass, polymerization initiator (Ciba Specialty Chemicals Co., Ltd., trade name Irgacure 184) 4 parts by mass are added and mixed, and methyl ethyl ketone and butyl acetate are 1: 1. An ink-repellent base coating solution was prepared by adding and adapting the solvent mixed at a ratio of 50 wt.

(3) Production of pattern-printed transparent sheet The ink-repellent solution of (2) was coated on a polyethylene terephthalate (PET) substrate with a bar coater to a thickness of 1 μm and cured by ultraviolet irradiation. Next, a dot pattern was applied on the base material with a thickness of 6 to 8 μm by the gravure printing method on the liquid crystal solution of (1) and cured by ultraviolet irradiation. When the reflection wavelength was measured with a spectrophotometer “UV-3100PC (manufactured by Shimadzu Corporation)”, the half-value width of the reflection wavelength was 60 nm and the reading angle was 30 degrees.

Examples 2-9 and Comparative Examples 1-12
A pattern-printed transparent sheet was obtained in the same manner as in Example 1 except that the substances shown in Table 1 were used as the base liquid and the leveling agent. The reflection wavelength and the reading angle were evaluated in the same manner as in Example 1. The results are shown in Table 1.

* 1 PETA: Pentaerythritol triacrylate (Nippon Kayaku Co., Ltd., trade name KAYARAD PET-30)
* 2 TMPTA; trimethylolpropane acrylate (Nippon Kayaku Co., Ltd., trade name KAYARAD TMPTA)
* 3 T-1420; acrylate resin (Nippon Kayaku Co., Ltd., trade name KAYARAD T-1420)
* 4 TPA-320; acrylate resin (Nippon Kayaku Co., Ltd., trade name KAYARAD TPA-320)
* 5 DPAC-120; acrylate resin (trade name KAYARAD DPCA-120, manufactured by Nippon Kayaku Co., Ltd.)
* 6 D-310; Acrylate resin (Nippon Kayaku Co., Ltd., trade name KAYARAD D-310)
* 7 M-208; acrylate resin (product name M-208, manufactured by Toagosei Co., Ltd.)
* 8 UV1700B; Urethane acrylate resin (Arakawa Chemical Co., Ltd., trade name UV1700B)
* 9 DPCA-60; Acrylate resin (Nippon Kayaku Co., Ltd., trade name KAYARAD DPCA-60)
* 10 DPCA-20; acrylate resin (Nippon Kayaku Co., Ltd., trade name KAYARAD DPCA20)
* 11 M-215; Acrylate resin (manufactured by Toagosei Co., Ltd., trade name M-215)
* 12 M-315; Acrylate resin (manufactured by Toagosei Co., Ltd., trade name M-315)
* 13 R-684; Acrylate resin (Nippon Kayaku Co., Ltd., trade name KAYARAD R-684)
* 14 M-220; Acrylate resin (manufactured by Toagosei Co., Ltd., trade name M-220)
* 15 BYK-361N; Leveling agent with acrylic skeleton (BIC Chemie, trade name BYK-361N)
* 16 BYK-354; Leveling agent (BIC Chemie, trade name BYK-354)
* 17 BYK-300; Leveling agent (BIC Chemie, trade name BYK-300)
* 18 BYK-UV1500; Leveling agent (BIC Chemie, trade name BYK-UV1500)
* 19 BYK-307; Leveling agent (BIC Chemie, trade name BYK-307)
* 20 BYK-310; Leveling agent (BIC Chemie Co., Ltd., trade name BYK-310)
* 21 BYK-380; Leveling agent (BIC Chemie, trade name BYK-380)

The pattern-printed transparent sheet of the present invention is a member that provides a coordinate detection means that can be applied to a data input system that is directly handwritten on the screen of a display device, and since a wide reading angle is obtained, the practical performance is high, The present invention can be used for various information processing apparatuses such as various portable terminals such as cellular phones and PDAs, personal computers, videophones, televisions having an intercommunication function, and Internet terminals.
In addition, by designing the shape and dimensions of transparent patterns as appropriate, optical input of barcodes, written test answer sheets, registration marks for printing stocks on rotary printing presses, falsification of vouchers, etc. And forgery identification patterns, and various other information input, identification, position detection, and the like.

It is sectional drawing which shows one embodiment of the pattern printing transparent sheet of this invention. It is sectional drawing which shows the other embodiment of the pattern printing transparent sheet of this invention. It is sectional drawing which shows the other embodiment of the pattern printing transparent sheet of this invention. It is sectional drawing which shows the structure of the polarizing plate of this invention. It is a principal part enlarged plan view which shows the example of an arrangement | sequence of the dot pattern in the pattern printing transparent sheet of this invention. It is the schematic of the system using the pattern printing transparent sheet of this invention.

Explanation of symbols

1: Pattern printing transparent sheet 2: Transparent substrate 21: Base material 22: Primer layer 3: Transparent pattern 4: Transparent layer 5: Display device 6: Input terminal (pen type)
7: Reading data processing device 8: Code 9: Anti-curl layer i: Infrared ray r: Reflected light

Claims (11)

  A transparent sheet in which an infrared reflective transparent pattern is printed on the surface of a transparent substrate, and the ink constituting the transparent pattern includes an infrared reflective material having wavelength selective reflectivity with respect to wavelengths in the infrared region, A pattern-printed transparent sheet, wherein the half-value width of the reflection wavelength when an infrared ray of 850 nm is irradiated to the transparent pattern at an incident angle of 5 degrees is 40 to 150 nm.   The said transparent substrate consists of a base material and a primer layer, the said transparent pattern is printed on the surface of a primer layer, and this primer layer consists of a primer composition which repels the ink which comprises a transparent pattern. The pattern-printed transparent sheet described in 1.   The pattern-printed transparent sheet according to claim 2, wherein the primer composition contains a liquid repellent leveling agent.   The pattern-printed transparent sheet according to claim 2 or 3, wherein the primer composition contains a reactive monomer and / or a reactive oligomer.   The pattern-printed transparent sheet according to any one of claims 1 to 4, wherein a transparent layer is formed with a thickness that is substantially the same as the transparent pattern or a thickness that covers the transparent pattern.   6. The pattern-printed transparent sheet according to claim 5, wherein an anti-curl layer is formed on the opposite side of the transparent pattern, and the thickness of the anti-curl layer is ± 5 μm or less of the thickness of the transparent layer.   The pattern-printed transparent sheet according to claim 1, wherein the transparent pattern has a selective reflection peak wavelength at 800 to 950 nm.   The pattern-printed transparent sheet according to claim 1, which is a liquid crystal material having a cholesteric structure to which the infrared reflecting material is fixed.   The pattern-printed transparent sheet according to claim 1, wherein the transparent pattern is a dot pattern.   The said transparent pattern is a pattern which can provide the positional information of the input terminal on a transparent sheet by reading an infrared reflective pattern with the input terminal which can irradiate and detect infrared rays. Pattern printing transparent sheet.   The pattern-printed transparent sheet according to claim 1, wherein the transparent sheet is a transparent sheet that is mounted to face a front surface of a display device capable of displaying an image.

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