JP2008108236A - Pattern printed sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light-weight and inexpensive pattern printed sheet, that is a member for providing a coordinate detecting means applicable for a data input system for hand-writing directly on a screen of a display device, while achieving wide area and mass production. <P>SOLUTION: The pattern printed sheet 1 of the present invention includes a substrate 2 and a non-visible light-reflective transparent pattern 3 printed on a surface of the substrate, wherein an ink for forming the transparent pattern 3 contains a non-visible light-reflective material capable of selectively reflecting a light having a wavelength in a non-visible light range, and the transparent pattern 3 printed on the surface of the substrate 2 has a multilayer structure in section which is repeated at predetermined intervals as observed by a scanning electron microscope, and reflects only a circular polarization component in a predetermined rotation direction relative to an incident light applied thereto. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a pattern printing sheet that is installed on the front surface of a medium that displays various image information and provides various information accompanying the image information. Above all, it is a member that provides coordinate detection means that can be suitably applied to a data input system for handwriting directly on the screen of a display device, and is particularly lightweight, inexpensive, easy to enlarge, and mass-produced. It relates to a possible pattern printing sheet.

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 sheet that satisfies such a requirement, for example, Patent Document 1 discloses a transparent sheet that is attached to the front or front of a display device, and includes position information that indicates the position of an input locus by an input electronic pen or the like. A mark that can be provided is printed using an ink that emits light that can be read by the input locus reading means when irradiated with light of a predetermined wavelength. However, Patent Document 1 does not describe the type of ink that embodies such a transparent sheet, merely describes the idea or desire of the transparent sheet, and is a specific example of a transparent sheet. There is no.
Further, Patent Document 2 discloses a coordinate input device using a transparent member printed with special ink that reflects an infrared region. However, Patent Document 2 also discloses a type of ink that embodies such a device. Are not described, only ideas or desires are described, and there is no specific example of the transparent sheet.
Japanese Patent Laid-Open No. 2003-256137 JP-A-2001-243006

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

As a result of intensive research to achieve the above object, the present inventors, for example, are represented by infrared rays on a sheet on which a pattern made of a transparent ink containing a liquid crystal material having a cholesteric structure is printed on a substrate. The present invention has been completed by finding that the above-mentioned object is achieved by irradiating invisible light and using the reflected light.
That is, according to the present invention, a non-visible light reflective transparent pattern is printed on the surface of a substrate, the ink constituting the transparent pattern includes a non-visible light reflective material, and the non-visible light reflective material is a non-visible light reflective material. It is a material having wavelength selective reflectivity with respect to the wavelength of the region, and is formed so as to include a multilayer structure having a constant repetition period when the cross section of the transparent pattern is observed with a scanning electron microscope, and The transparent pattern provides a pattern printing sheet that reflects only a circularly polarized light component in a desired rotation direction with respect to incident light.

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

As shown in FIGS. 1 to 3, the pattern printing sheet 1 of the present invention has a non-visible light reflective transparent pattern 3 printed on the surface of the substrate 2, and the ink constituting the transparent pattern 3 is invisible light reflective. A cross section of the transparent pattern 3 having a non-visible light reflection property, which is a material having wavelength selective reflectivity with respect to a wavelength in a non-visible light region, Is observed to be observed with a scanning electron microscope (SEM), and the transparent pattern 3 is formed of only a circularly polarized component in a desired rotational direction with respect to incident light. To reflect.
The invisible light is preferably infrared or ultraviolet. The infrared light is preferably light in the near infrared region of 800 to 2500 nm, and is preferably infrared light having a selective reflection peak wavelength at 800 to 950 nm. Moreover, as an ultraviolet-ray, it is preferable that it is an ultraviolet-ray which preferably has a selective reflection peak wavelength in 200-400 nm.

The ink component that forms the invisible light reflective transparent pattern (hereinafter also referred to simply as the transparent pattern) used in the present invention reflects the invisible light, and the cross section of the formed transparent pattern is observed with a scanning electron microscope. If the transparent pattern has a function of reflecting only the circularly polarized light component in the desired rotation direction with respect to the incident light, the multilayer pattern is formed so as to include a multilayer structure having a constant repetition period. Although not particularly limited, the multilayer structure is preferably formed of a liquid crystal material having a fixed cholesteric structure.
Here, a liquid crystal having a cholesteric (chiral nematic) structure has a spiral structure (cholesteric structure) with a constant period. A characteristic of the cholesteric structure is that it corresponds to the direction of the helix and reflects circularly polarized light having a wavelength corresponding to the helix pitch (selective reflection). The selective reflection wavelength λ (nm) is generally given by the following equation.
λ = p · n · cos θ
p: helical pitch of cholesteric liquid crystal (nm)
n: average refractive index of liquid crystal θ: incident angle of light (angle from surface normal)
One pitch of the cholesteric structure is the length of an axis in which elongated liquid crystal molecules rotate in a spiral by rotating 360 °. However, when the cross section is actually observed, a repeated layer structure can be seen every 180 ° (see FIG. 5). reference). Therefore, the apparent interlayer pitch seen when observing the cross section is ½ of the helical pitch of the liquid crystal. Therefore, if the apparent interlayer pitch seen when the cross section is observed is 250 nm, the pitch of the liquid crystal is 500 nm.
If the property of reflecting only the circularly polarized light in the desired rotation direction is used, the reflected light from the non-visible light reflective transparent pattern and its background light (from other than the pattern part) can be combined with a circular polarizing filter or the like. It is possible to improve the SN ratio of reflected light.

Hereinafter, a liquid crystal material exhibiting a cholesteric structure applicable to the pattern printing sheet of the present invention will be described.
As the liquid crystal material exhibiting a cholesteric liquid crystal phase used in the present invention, a polymerizable chiral nematic liquid crystal material (polymerizable liquid crystal material) obtained by mixing a polymerizable chiral agent with a polymerizable nematic liquid crystal, or a polymer cholesteric liquid crystal material is used. can do.
In the present invention, among the polymerizable liquid crystal materials, it is preferable to use a polymerizable monomer or a polymerizable oligomer, and it is more preferable that the polymerizable functional group has an acrylate structure.
In addition, as the liquid crystal material exhibiting (expressing) the cholesteric structure, as long as it exhibits a high reflectance (usually about 5 to 50%) in at least a part of wavelengths of invisible light, for example, an infrared region, Originally, high transparency is not necessarily required at wavelengths in the visible light region. Even if the liquid crystal material exhibiting 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 therefrom 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%. 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 by crosslinking or the like in the state of the cholesteric phase, but the material exhibiting a temperature of cholesteric phase is in the range of 30 to 140 ° C. Is preferable because the drying process during pattern 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. 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 polymerizable monomer include liquid crystals as disclosed in JP-A-7-258638, JP-A-11-513019, JP-A-9-506088 and JP-A-10-5088822. Mixtures of functional 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 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), X ¹ is 2 to 5 (integer). ]

Moreover, as the 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 contained in the transparent ink used in the present invention 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. However, a material having an acrylate structure as exemplified in Formula (12) 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). ]

  As described above, the property of reflecting the invisible light of the transparent pattern in the present invention is that utilizing the wavelength selective reflectivity (the same principle as Bragg reflection in X-ray diffraction) of a liquid crystal material having a cholesteric structure. Preferably, 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 addition amount. The amount of chiral agent added to obtain the target selective reflection peak wavelength in the non-visible light 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) Is used, a cholesteric phase having a reflection peak in the infrared region is formed by adding about 3 parts by weight of the chiral agent to 100 parts by weight 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 nematic liquid crystal molecules and a chiral agent in the present invention can be obtained, for example, by adding a known photopolymerization initiator or the like to a polymerizable nematic liquid crystal and a polymerizable chiral agent and irradiating with ultraviolet rays to cause radical polymerization. .
In the present invention, when a transparent pattern is printed, 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.
In the pattern printing sheet of the present invention, the printing method of the transparent pattern is not particularly limited, and a known method can be used, and examples thereof include a flexographic printing method, a gravure printing method, a stencil printing method, and an ink jet printing method. It is done.

The pattern printing sheet 1 of the present invention is installed in combination with or integrated with various image display media, and is used for the purpose of providing various information (position coordinates, etc.) attached to the 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, barcodes, and photographic images (landscapes, people, paintings, and other various types). And so on. Specific examples of the image display medium 5 include display devices such as CRT (cathode ray tube), LCD (liquid crystal display device), PDP (plasma display), EL (electroluminescence) display device, or paper or resin on which an image is printed. Examples include books, brochures, catalogs, forms, instruction manuals, etc. made of film. Examples of the usage or specification form include various types described later (such as a mobile phone). Among them, a representative one is a use that is installed opposite to the front surface of a display device such as a CRT and inputs position coordinate information of an image to be handwritten on a screen. Moreover, the pattern printing sheet 1 of this invention can also be integrated as a part of polarizing plate used for front films, such as a liquid crystal display, for example.
Hereinafter, the use of the pattern printing sheet 1 of this invention is explained in full detail. As shown in FIG. 1, information on the position of the input terminal on the sheet 1 can be provided by reading the reflection pattern of the pattern printing sheet 1 using the input terminal 6 capable of irradiating and detecting invisible light. is there.
The pattern printing sheet 1 of the present invention is preferably mounted on a display device 5 capable of displaying an image, and is preferably mounted facing the front surface of the display device.
Note that mounting attached to the front face includes both a form in which the display apparatus is attached in close contact with the front face of the display apparatus and a form in which the display apparatus is mounted in an isolated state through the gap.

In the pattern printing sheet of the present invention, the 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.
Such patterns are also exemplified in Patent Documents 1 and 2, for example, by setting a plurality of dot shapes and patterning a combination of these multiple-shaped dots arranged within a predetermined range in a plane. Such as a pattern in which the size of the overlapping portion 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 in the vertical and horizontal directions of the dots. However, as a particularly simple and preferable one, 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 the relative positional relationship of these dots 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 pattern printing sheet of the present invention, in order to detect the reflection pattern by the non-visible light sensor provided in the input terminal, it is preferable that the non-visible light reflectance at the selective reflection peak wavelength is large. Usually, the reflectivity is about 5 to 50% at the selective reflection peak wavelength, and preferably 20% or more. The reflection by the cholesteric structure has a property of reflecting only circularly polarized light in the same direction as the cholesteric spiral, and therefore reaches only about 50% at the maximum.
In the case of reflection with a cholesteric structure, the reflection intensity generally increases as the printing thickness increases, 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 thickness is usually about 1 to 20 μm, preferably about 3 to 10 μm.
When the print pattern is a dot pattern, the dot shape is not particularly limited as long as it can be easily distinguished from adjacent dots, and usually, the shape in plan view is a circle, an ellipse, a polygon, or the like. The three-dimensional shape of the dot is not particularly limited and is usually a disc shape, but may be a hemispherical shape or a concave shape.

As a board | substrate used for the pattern printing sheet | seat of this invention, you may be transparent or opaque and the thing of the form of what is called a film, a sheet | seat, or a board is used suitably.
As a material for the transparent substrate, glass, TAC (triacetyl cellulose), PET (polyethylene terephthalate), polycarbonate, polyvinyl chloride, acrylic, polyolefin, or the like is preferably used. Moreover, thickness is suitably selected from the range of about 20-5000 micrometers according to material, required performance, and a usage form.
In the case where a material that is easily dissolved or swelled in a solvent such as a polymer film such as a TAC film is used as the transparent substrate, a barrier is provided on the substrate so that the substrate is not attacked by the solvent in the coating solution used at the time of transparent pattern printing. It is preferable to provide a layer. In this case, the barrier layer may also serve as the alignment film. For example, a water-soluble substance such as PVA (polyvinyl alcohol) or HEC (hydroxyethyl cellulose) may be used as the barrier layer.
Examples of the opaque substrate include paper, cloth, plastic to which a dye or pigment is added, and a metal plate.

  In the pattern printing sheet of the present invention, although not necessarily required, it is preferable to provide the alignment film 4 on the substrate 2 in order to stabilize the liquid crystal alignment when a liquid crystal material is used (see FIG. 4). . 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 board | substrate.

In addition, in the pattern printing sheet of the present invention, when handwriting is input with an input terminal such as a pen type, a hard coat layer (hard coating film) A surface protective 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.
Furthermore, when there is a display device behind the pattern printing sheet of the present invention, an antireflection film or the like may be provided on the surface or inside of the sheet in order to ensure the visibility. The material of the antireflection film is not particularly limited, and those used in the field of normal display transparent sheets and lenses can be used. For example, a dielectric in which a thin film of a low refractive index material such as magnesium fluoride or fluorine resin and a thin film of a high refractive index material such as zirconium oxide or titanium oxide are laminated so that the low refractive index thin film is the outermost surface A multilayer film or the like is a typical one.

The display device may be connected to an information processing device that processes handwritten input data, or may be independent, but the former may display a locus during handwriting input on the screen. This is preferable because 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.

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

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

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

The pattern printing sheet of the present invention can be detachably attached to the front or front of the display device. In this way, not only one display device but also another display device can be attached. Further, it is preferable that the sheet itself is provided with a mounting means for the display device so that the sheet can be mounted without performing processing for mounting on the display device side. The mounting means may be provided integrally with the seat or may be provided separately.
Examples of such mounting means include a device that hooks a buckle-shaped object on the corner of the display device, and a device that sandwiches an end of the display device. In the case of mounting on the front surface of the display device, there is a sticking tool that is provided on the contact surface side that comes into contact with the display device and has adhesiveness or adhesiveness for sticking to the display device. Examples of the sticking tool include those having adhesiveness or tackiness that are integrally attached to the sheet, and those that include an adhesive or pressure-sensitive adhesive directly applied to the contact surface.

The pattern printing sheet of the present invention is preferably made separable in order to improve the manufacturing convenience. Specific examples include those that can be separated with a cutting tool such as a scissors or a dedicated cutting tool, and those that can be separated by hand by inserting perforations. If this is the case, the user can cut according to the size of the display device owned by each user, so the manufacturer has set several predetermined sizes. This is because a sheet may be manufactured. Further, a perforation may be made in the standard size of a general-purpose display device.
Also, if such usage is possible, it is possible to divide one sheet on which a pattern providing position information is printed, and to indicate different coordinate ranges for each sheet. When such a sheet is used, for example, if a sheet indicating continuous coordinates is applied to an adjacent display device, continuity can be given to input data. Further, by using a plurality of sheets having different coordinate ranges for one input device, different meanings can be given to the respective 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
Monomer having a polymerizable acrylate at both ends, a mesogen at the center, and a spacer between the acrylate and a nematic-isotropic transition temperature around 110 ° C. (having the molecular structure shown by the compound (11)) 1) Cyclohexanone (hereinafter referred to as “cyclohexanone”) in which 100 parts by weight and 3.3 parts by weight of a chiral agent having a polymerizable acryloyl group (both having a molecular structure represented by the above chemical formula (12)) are dissolved in anone. An abbreviated anone) solution was prepared. In addition, 4 parts by weight of a photopolymerization initiator (manufactured by BASF Japan Ltd., Lucillin (registered trademark) TPO) was added to the anone solution.
On the other hand, on a transparent glass substrate having a thickness of 0.7 mm, a polyimide dissolved in a solvent (manufactured by JSR Corporation, Optmer (registered trademark) AL1254) is spin-coated with a spin coater, dried, and then formed at 200 ° C. ( An alignment film was formed by rubbing with a film thickness of 0.1 μm.
On the obtained glass substrate with an alignment film, a dot pattern and a rectangular pattern for reflectance measurement were printed by the flexographic printing method using the anone solution 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 acryloyl group of the chiral agent are crosslinked and polymerized by radicals generated from the photopolymerization initiator in the coating film, and a transparent disc-like dot pattern is formed in a rectangular region. As shown in the plan view of FIG. 2, each dot is shifted two-dimensionally from the square lattice point by a predetermined coordinate, and a reflectance measurement rectangular pattern (not shown) is formed in a blank portion outside the rectangular area. ) Was formed. The film thickness of the pattern at this time was about 2 μm, and the dot size was about 100 μm in the diameter of the disk.
About the obtained transparent sheet, when the reflectance of the rectangular pattern for reflectance measurement (solid coating part) was measured with a spectrophotometer (manufactured by Shimadzu Corporation, incident angle 5 °), the selective reflection wavelength of the coating film was It was 830 to 880 nm, and the reflectance was 20%.
Moreover, when the cross section of the pattern was observed by SEM, it was confirmed that the layer structure of a fixed space | interval was formed. Also, when the sheet sample was irradiated with infrared rays, the reflected light was passed through a quarter wave plate and a linear polarizing plate in this order, and the quarter wave plate was rotated in the plane while observing with an infrared camera. It was confirmed that only the brightness of the pattern portion changes periodically, and the pattern has a characteristic of reflecting only a circularly polarized component in a desired rotation direction with respect to incident light. The helical pitch was 525 nm.

Example 2
A hydroxyethyl cellulose (HEC) solution dissolved in pure water so as to have a concentration of 2% by weight is coated on a transparent TAC film (thickness 80 μm, hatched) by bar coating, dried, and then formed at 100 ° C. By forming a film (film thickness 0.2 μm), a transparent substrate with an alignment film was produced.
On the obtained base material, the dot pattern and the rectangular pattern for reflectance measurement were printed by the gravure printing method using the anone solution prepared in Example 1 as an ink. In the same manner as in Example 1, drying (phase transition) treatment and curing treatment were performed to produce a transparent sheet on which a transparent disk-like dot pattern and a rectangular pattern for reflectance measurement were formed. At this time, the film thickness of the pattern was about 5 μm, and the dot size was about 100 μm in the diameter of the disk.
About the obtained transparent sheet, when the reflectance of the rectangular pattern for reflectance measurement (solid coating part) was measured with a spectrophotometer (manufactured by Shimadzu Corporation, incident angle 5 °), the selective reflection wavelength of the coating film was The reflectance was 830 to 880 nm, and the reflectance was 13%.
Moreover, when the cross section of the pattern was observed by SEM, it was confirmed that the layer structure of a fixed space | interval was formed. Also, when the sheet sample was irradiated with infrared rays, the reflected light was passed through a quarter wave plate and a linear polarizing plate in this order, and the quarter wave plate was rotated in the plane while observing with an infrared camera. It was confirmed that only the brightness of the pattern portion changes periodically, and the pattern has a characteristic of reflecting only a circularly polarized component in a desired rotation direction with respect to incident light. The helical pitch was 525 nm.

  As described above in detail, the pattern printing sheet of the present invention can be applied to a data input system for providing additional information to an image display medium, such as inputting data by handwriting directly on a display device. In addition to being able to reduce the work space, it is a member that provides means, and is lightweight, inexpensive, easy to increase in area, and can be mass-produced. 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 equipment.

It is the schematic of the whole system using the pattern printing sheet of this invention. It is a principal part enlarged plan view which shows the example in which the dot pattern was irregularly arranged in the pattern printing sheet of this invention. It is sectional drawing which shows one embodiment of the pattern printing sheet of this invention. It is sectional drawing which shows another one embodiment of the pattern printing sheet of this invention. It is a scanning electron micrograph which shows the repeating layer structure of a cholesteric liquid crystal.

Explanation of symbols

1: Pattern printing sheet 2: Substrate 3: Transparent pattern 4: Alignment film 5: Display device 6: Input terminal (pen type)
7: Reading data processing device 8: Code i: Invisible light (incident light)
r: reflected light

Claims (16)

  A non-visible light reflective transparent pattern is printed on the surface of the substrate, and the ink constituting the transparent pattern includes a non-visible light reflective material, and the non-visible light reflective material is used for the wavelength in the non-visible light region. It is a material having wavelength selective reflectivity, and when the cross section of the transparent pattern is observed with a scanning electron microscope, it is formed so as to include a multilayer structure having a fixed repetition period, and the transparent pattern is incident A pattern printing sheet that reflects only circularly polarized light components in a desired rotational direction with respect to light.   The pattern printing sheet according to claim 1, wherein the multilayer structure is formed of a liquid crystal material having a fixed cholesteric structure.   The pattern printing sheet according to claim 2, wherein the liquid crystal material having a cholesteric structure is a chiral nematic liquid crystal material obtained by mixing a nematic liquid crystal with a chiral agent.   The pattern printing sheet according to claim 2, wherein the liquid crystal material having a cholesteric structure is a polymer cholesteric liquid crystal material.   The pattern printing sheet according to claim 3, wherein each of the nematic liquid crystal and the chiral agent has a functional group capable of crosslinking, and the cholesteric structure is fixed by crosslinking the functional groups.   The pattern printing sheet according to claim 3, wherein the nematic liquid crystal and / or the chiral agent is a compound having an acrylate structure.   The pattern printing sheet according to claim 1, further comprising an alignment film between the substrate and the transparent pattern.   The pattern printing sheet according to claim 1, wherein the transparent pattern has a selective reflection peak wavelength at 800 nm to 950 nm.   The pattern printing sheet according to claim 1, wherein the transparent pattern has a selective reflection peak wavelength at 200 nm to 400 nm.   The pattern printing sheet according to claim 1, wherein a printing thickness of the transparent pattern is 1 to 20 μm.   The information on the position of the input terminal on the sheet can be provided by reading the reflection pattern of the sheet using the input terminal capable of irradiating and detecting invisible light. Pattern printed sheet as described in 1.   The pattern printing sheet according to claim 11, wherein the pattern printing sheet is a sheet attached to a display device capable of displaying an image.   The pattern printing sheet according to claim 12, which is mounted to face the front surface of the display device.   The pattern printing sheet according to claim 11, further comprising mounting means for mounting on the display device.   The pattern printing sheet according to claim 14, wherein the mounting means is an adhesive tool that is provided on a contact surface side that comes into contact with the display device and has an adhesive property or an adhesive property to be attached to the display device.   The pattern printing sheet according to claim 1, wherein the pattern printing sheet is separable.

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