JPH02301815A - Pressure-sensitive input tablet - Google Patents

Abstract

PURPOSE:To give a contamination-proof and water-repellent properties to the subject tablet by providing the layer of insulating fine particles between two conductive layers and, in addition, a specific organic coating film. CONSTITUTION:The organic coating film 11 of one kind selected out of the coating films A, B and C expressed by Formula I is applied on the pressing side of a conductive film 1 disposed with conductive film 2 on the side opposite to the pressing side. Then three elements of the conductive film 1, deformable insulating fine particles 4 having a mean particle size of 0.1-100mum, and a conductive plate 5 which is not conducted with the film 1 due to the particles 4 and has a conductive film 6 on the surface brought into contact with the particles 4 are successively laminated in this order. Therefore, the contamination-proof and water-repellent properties can be given to this tablet.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to an image input device called a so-called pressure-sensitive input tablet, and is used in information-related equipment.
It is preferably used as a material for an input device for image information.

[Prior art] Conventionally, pressure-sensitive tablets 1 to 1 are resistant to external noise, have extremely simple configurations, can be designed compactly, are low-priced, and can be made transparent relatively easily. Because it has many characteristics such as , its applied products are used as test instruments or put into practical use in various fields.

A typical example of a conventional pressure-sensitive input tablet is one in which spacers are arranged in a dot-like manner, and the dots in this tablet are 150 μm or more.

Furthermore, in JP-A-59-188726, an insulating rubber sheet layer is provided between two conductive films, and several conductive thin wires are oriented in the sheet thickness direction. An image input device made of the following has been released to the public.

Furthermore, usp3.9, . Japanese Patent No. 215 discloses a pen input element in which non-deformable buttons having a certain height are arranged at specific intervals as spacers between a conductive film and a conductive plate.

Furthermore, Japanese Patent Application Laid-Open No. 62-2360 discloses a transparent touch input device using a thin plate of conductive glass that partially bends due to compression, and interposing a spacer whose thickness changes due to compression.

[Problem to be solved by the invention] However, in the conventional tablet arranged in a dot matrix manner, the spacers are thick, so
There were drawbacks to the appearance, such as a poor appearance and a feeling of discomfort when touched with a finger.

Furthermore, in the technique disclosed in Japanese Patent Application Laid-Open No. 59-188726, the conductive thin wire easily destroys the conductive film, and its durability is insufficient for long-term use.

Also, usp3.9,. The technique disclosed in Japanese Patent No. 215 also has a problem in that the button is present between the conductive film and the conductive plate, and the button, which is a spacer, does not deform during input, resulting in significantly poor drawing durability. Furthermore, since the buttons do not deform, input could be made with a pen or the like, but not with a finger.

In addition, the conventional Japanese Patent Application Publication No. 59-188726, USP
3゜9,. No. 215, and JP-A-62-2
The technology disclosed in No. 360 has the disadvantage that the surface film is easily contaminated with dirt such as hand marks, fingerprints, sweat, hair liquid, hair spray, etc., and it is difficult to remove the stains from the surface layer of the film by pressing with a finger or the like. Ta. In addition, the surface had poor slipperiness, and furthermore, water droplets were difficult to fall off, and water stains were easily caused.

Furthermore, there have been proposed touch panels in which the surface layer on the pressing side is coated with an antistatic treatment, a touch panel treated with a hardened film, and a touch panel coated with a film treated with an antireflection treatment. Problems such as easy dirt on the surface layer, poor slippage, and difficulty in dripping water cannot be improved.

The present invention aims to eliminate the drawbacks of the prior art, and has excellent durability, eliminates problems such as dirt on input by fingers, surface slippage, water droplets, etc., and has high reliability and durability. The purpose is to provide an excellent pressure-sensitive input tablet.

-6= [Means for Solving the Problem] In order to achieve the above object, the present invention has the following configuration.

[(1) A pressure-sensitive input tablet characterized in that at least the following elements A, B, and C are integrally stacked in this order.

B. A conductive film having a conductive film disposed on the opposite side to the pressing side, and having a single layer or multiple layers of one type of organic coating selected from A, B, and C below on the pressing side surface of the conductive film. A conductive film that is coated with a conductive film.

A: A coating obtained from an organic polysiloxane containing terminal silanol; B: A coating obtained from a fluorine-containing polymer; C: The conductive film is represented by the general formula RR', S i X3. , , (where R and R' are hydrogen, alkyl group, halogenated alkyl group, allyl group, aryl group, halogen, respectively). represents one selected from aryl groups, and a represents 1 or 2. Also, X is a hydrolyzable group.)
Fine particles having a number average particle diameter of 0.1 to 100 μm, deformable, and having insulating properties.

A conductive plate having substantially no conductivity between it and the conductive film (A) through the fine particles (c) and (b), and having a conductive film disposed on the surface in contact with the fine particles.

(2) A pressure-sensitive input tablet characterized in that at least the following elements A, B, and C are integrally laminated in this order.

B. A conductive film in which a conductive film is disposed on the opposite side of the pressing side and a cover film is provided on the pressing side,
A conductive film formed by coating the surface of the cover film with a single layer or multiple layers of one type of organic film selected from A, B and C below.

A: a film obtained from an organopolysiloxane containing terminal silanol; B: a film obtained from a fluorine-containing polymer; C: the cover film is placed in an environment in which an organosilicon compound represented by the general formula RR', S i A coating obtained by the following treatment (where R and R' each represent one selected from hydrogen, an alkyl group, a halogenated alkyl group, an allyl group, an aryl group, and a halogenated aryl group, and a is (1 or 2 is not shown. Also, X is a hydrolyzable group.) The number average particle size is 0. Microparticles that are 1 to 100 μm, deformable, and have insulating properties.

A conductive plate having substantially no conductivity between it and the conductive film (A) through the fine particles (c) and (b), and having a conductive film disposed on the surface in contact with the fine particles. ” The pressure-sensitive input tablet of the present invention has two layers of insulating fine particles.
Since it is provided between two conductive layers, when pressed, the two conductive layers become electrically conductive and can be extracted as an electrical signal. Therefore, it can be used as a switch element or a signal can be extracted as an X-Y coordinate.

Preferred embodiments will be described below with reference to the drawings.

In the present invention, the conductive film (a) and the conductive plate (c) may be connected to a current source, preferably a constant current source, but
Preferably, at least one of the conductive film and the conductive plate has an electrode, and the most preferred example is that both the conductive film and the conductive plate have two electrodes. Alternatively, electrodes can be attached to the four sides of only one sheet, and only one electrode can be taken out from the other conductive film. It is preferable that the conductive film on the side from which only one film is taken out has as good conductivity as possible, and is preferably selected to have a conductivity of at least 10 times, more preferably at least 100 times, that of the other side.

In this case, two of the four extraction electrodes facing each other alternately act on coordinate reading.

1, 2, and 3 are exploded views of the main components of a pressure-sensitive input tablet having two electrodes each on a conductive film and a conductive plate.

In FIG. 1, 1- is a film and 2 is a conductive film, which is a conductive film obtained by forming the second conductive film on one side of the first film. Extracting electrodes 3 and 3' are attached to the conductive film along two opposing sides. These electrodes can be formed by applying a conductive paint or by applying a conductive adhesive and attaching a metal foil therethrough. In particular, in order to make a transparent tablet, it is preferable that both the film and the conductive film are transparent. Although not shown in the figure, lead wires are drawn out from these electrodes. Furthermore, - indicates an organic film.

One of the features of the present invention is that by providing this organic film, stain resistance and water repellency are imparted. As the organic film, A: a film obtained from an organic polysiloxane containing terminal silanol; B: a film obtained from a fluorine-containing polymer; C: the conductive film has the general formula RR', 5iX3. A film obtained by treatment in an environment in which an organosilicon compound represented by (a represents 1 or 2, and X represents a hydrolyzable group. Alternatively, multiple layers may be provided.

Further, it is another invention of the present application to further provide a cover film on the film 1-, and provide the cover film 2 with a crimping organic coating. Providing a cover film is preferable in that it alleviates damage to the conductive film due to input and improves durability. FIG. 4 shows a drawing of the conductive film when a cover film is provided. In FIG. 4, numeral 9 indicates a cover film.

FIG. 3 shows a conductive plate in which a conductive film 6 is formed on one side of the plate 5. As shown in FIG. Reference numerals 7 and 7' designate electrodes corresponding to 3 and 3', respectively, and 7 and 7' and 3 and 3' are arranged in a direction perpendicular to each other.

The conductive film shown in FIG. 1 or the conductive plate shown in FIG. A widely known material obtained by forming a thin film of a substance by means such as vapor deposition, sputtering, or coating is preferably used. A conductive film formed by sputtering, thermal CVD, or vacuum deposition of gold, tin oxide, and indium oxide is particularly suitable from the viewpoints of transparency, translucency, and conductivity. The resistance value of the conductive film is 1-×10 Ω/
Films and plastics with a diameter in the range of 5 x 10 Ω/mouth are preferably used, and the film and plastic materials used include resins such as polyethersulfone, polyester, acrylic, polycarbonate, poly(4-methyl-1-pentene), and The material is selected from inorganic glasses, and polyether sulfone and polyester are particularly suitable for the film, and acrylic and polycarbonate are particularly suitable for the resin plate in terms of transparency, strength, etc.

In addition, the material for the cover film includes the same material as the conductive film, polypropylene, vinyl chloride,
Acrylic, polycarbonate-1, polyphenylene sulfide, and the like are preferably used.

There is no problem even if the input surface of the tablet is opaque, but it is particularly preferable that the input surface of the tablet be entirely made of a transparent base material in order to be able to input directly to the display.In that case, the overall light transmittance is approximately equal to the power of the light transmittance of each material, and it is preferable that the total light transmittance is 60% or more in consideration of application to liquid crystal displays.

In FIG. 2, numeral 4 indicates insulating fine particles made of inorganic and/or organic material, which are dispersed and coated on 6''.

When no pressure is applied, it is an insulator and prevents electrical contact between the upper and lower conductive films, but when strong pressure is applied, such as with the tip of a pen or finger, the conductive film breaks down from the gap between the particles. Electrical contact is made between them, and electrical connection can be made with the upper and lower conductive films.

In addition, when the fine particles used in the present invention are pressed with a pen, finger, etc. from the above-mentioned film 1,
It is necessary to have elasticity that allows deformation.

Here, the required characteristics of the ease of deformation of fine particles should be optimized for each application, such as the film used and the input material, but normally fine particles that are more easily deformed than the film used have a long lifespan. It is preferably used from the viewpoint of performance. One specific example of a method for defining the ease of deformation of fine particles is to test 20 kg/20 kg of fine particle forming material based on the test method of JIS K7208.
When deformed under a load of ad, it can be expressed as the amount of deformation (D (%)) determined by the following formula.

LO Here, LO is the thickness of the material forming the fine particles when no pressure is applied,
L is the thickness of the material forming microparticles under pressure of 20 kg/cr&.

Materials forming fine particles preferably used in the present invention have a deformation amount (D (%)) of 10% or more, and particularly 15% or more when used under harsh conditions. Preferably, those having a certain amount.

From the viewpoint of durability, it is preferable that such fine particles have a deformation characteristic that does not break due to compression and can be recovered any number of times. In other words, it is preferable that the material has elasticity.

Furthermore, in addition to deformable particles, it is also possible to use fine particles that do not deform as long as durability is not significantly reduced. In addition, when non-deformable fine particles are used in combination, it is necessary that the deformable fine particles are contained in the total fine particles in an amount of 40% by weight or more.

It goes without saying that the components of such fine particles may be inorganic or organic, and it is possible to use two or more kinds in combination, but organic materials are particularly preferred from the viewpoint of durability. Further, in order to enable uniform coating or easy dispersion and maximize the insulating effect, the shape of the fine particles is preferably substantially spherical.

Preferred components of such fine particles having elasticity that can be deformed include those made of thermoplastic resin, such as polyamide resin, polyester resin, ethyl cellulose, ethylene-vinyl acetate copolymer, vinyl acetate resin or its derivatives, polystyrene or Examples include copolymers thereof, butyl methacrylic resins, acrylic rubbers made of copolymers thereof, polyisobutylene, polypropylene, and the like. These may be used alone or in a mixture or in a thermosetting resin.

It is also preferable to provide a double-sided tape between the conductive film shown in FIG. 1 and the spacer shown in FIG. 2, in order to keep the gap between the conductive films constant and to prevent misalignment. Further, it is also preferable to provide an insulating resin film in a portion between the conductive film and the extraction electrode where insulation needs to be maintained.

Furthermore, it is also preferable to provide a conductive coating film between the spacer shown in FIG. 2 and the conductive plate shown in FIG. 3. FIG. 5 shows a drawing in which double-sided tape is used. In FIG. 5, 8 indicates double-sided tape.

In the present invention, it is also preferable to provide a cured film on the surface of the conductive film or the cover film on the conductive film, and to provide an organic film thereon from the viewpoint of improving the abrasion resistance and adhesion of the film.

As a cured film, polyvinyl alcohol, cellulose, melamine resin, epoxy resin2. Examples include polysiloxane resin, acrylic resin, and urethane resin. Among them, thermosetting resins are preferably used from the viewpoint of surface hardness, heat resistance, hot water resistance, chemical resistance, etc., and polysiloxane resins are particularly preferably used from the viewpoint of improving surface hardness.

Typical examples of compositions for forming organopolysiloxanes include organosilicon compounds represented by the following general formula (I) and/or hydrolysates thereof.

R' R2b S I X 4-84 (
a) (Here, R1 and R2 are organic groups having 1 to 10 carbon atoms, and X is a hydrolyzable group. a and b are 0 or 1.) Here, R1 and R2 are each alkyl group, alkenyl group, aryl group, or halogen group, epoxy group, glycidoxy group, amino group, mericapto group.

It is a hydrocarbon group having a methacryloxy group or a cyano group, and may be the same or different types. X may be any hydrolyzable substituent selected from halogen, alkoxy, alkoxyalkoxy, phenoxy or acetoxy groups. a, b
are respectively 0 or 1. It is also possible to add one type or two or more types of these organosilicon compounds. Particularly for the purpose of imparting dyeability, it is preferable to use organosilicon compounds containing epoxy groups and glycidoxy groups, resulting in high added value.

The above compositions are usually diluted in volatile solvents and applied as liquid compositions. The solvent to be used is not particularly limited, but when used, it is required not to impair the surface properties of the object to be coated, and also to take into consideration the stability of the composition, wettability to the substrate, volatility, etc. It should be decided.

Moreover, it is also possible to use not only one type of solvent but also a mixture of two or more types.

Furthermore, particulate inorganic oxides are preferably used as structural acid components for the purpose of improving the hardness of the cured film and improving adhesion to the antireflection film. Such fine particulate inorganic oxides are those that do not impair transparency in the coating state and are not particularly limited as long as they achieve the purpose, but from the viewpoint of workability and imparting transparency, particularly preferred examples include: Examples include colloidally dispersed sols. More specific examples include silica sol, titania sol, zirconia sol, antimony oxide sol, and alumina sol. The amount of the particulate inorganic oxide added is not particularly limited, but in order to exhibit the effect more clearly, it is preferably contained in the cured film in an amount of 5% by weight or more and 80% by weight or less. That is, if it is less than 5% by weight, no obvious effect of addition is observed, and if it exceeds 80% by weight, there are problems such as poor adhesion to the transparent substrate, cracks in the film itself, and decreased impact resistance.

The fine particulate inorganic oxide has an average particle size of 1. ~200
mμ is usually used, preferably 5 to 10
A particle size of 0 mμ is used.

If the average particle diameter exceeds 200 mμ, the resulting film will have reduced transparency and become highly cloudy, making it difficult to thicken the film. Moreover, those less than i mμ have poor stability;
This results in poor reproducibility.

Furthermore, there is no problem in adding various surfactants and amines to improve the dispersibility of the fine particles. Furthermore, there is no problem in using two or more kinds of particulate inorganic oxides in combination.

Furthermore, it is also possible to use various surfactants in the coating composition for forming these cured films in order to improve the flow during application. block or brat copolymers, and fluorine-based surfactants are effective.

Furthermore, it is also possible to add an ultraviolet absorber for the purpose of improving weather resistance, and an antioxidant to improve heat deterioration resistance.

Furthermore, various inorganic compounds can be added to these coating compositions as long as they do not significantly reduce coating performance, transparency, etc.

Adhesion to the substrate can be improved by using these additives together.

Physical properties such as chemical resistance, durability, and stainability can be improved. The inorganic materials that can be added include metal alkoxides represented by the following general formula [n],
and various chelate compounds and/or hydrolysates thereof.

M (OQ) [■] (Here, Q is an alkyl group, an acyl group, or an alkoxyalkyl group, and m is the same value as the number of charges of the metal M. M is silicon, titanium, or zircon.

These include antimony, tantalum, germanium, and aluminum. ) When forming a cured film in the present invention, various curing agents can be used for the purpose of accelerating curing, enabling low-temperature curing, etc. As the curing agent, various epoxy resin curing agents or various organosilicon resin curing agents can be used.

Specific examples of these curing agents include various organic acids and their acid anhydrides, nitrogen-containing organic compounds, various metal complex compounds or metal alkoxides, and various salts such as alkali metal carboxylates and carbonates. Further examples include peroxides and radical polymerization initiators such as azobisisobutyronitrile. It is also possible to use a mixture of two or more of these curing agents. Among these curing agents, the aluminum chelate compounds shown below are particularly useful for the purpose of the present invention from the viewpoints of stability of the coating material, prevention of discoloration of the coating film after coating, and the like.

The aluminum chelate compound mentioned here has the general formula A
LYIIZ3. This is an aluminum chelate compound represented by

(However, in the formula, Y is 0L (L is a lower alkyl group), Z is a ligand derived from a compound represented by the general formula M' COCH2C0M2 (Ml and M2 are both lower alkyl groups), and a general formula M3COCH2C00M' (M3
．． M' is at least one ligand derived from a compound represented by a lower alkyl group),
n is 0. 1 or 2. ) ALYIIZ3-rl
Among the aluminum chelate compounds indicated by the solubility in the composition.

From the viewpoint of stability and effectiveness as a curing catalyst, aluminum acetylacetonate, aluminum bisethylacetoacetate monoacetylacetonate, aluminum di-n-butoxide-monoethylacetoacetate, aluminum di-1so-propoxide-monomethylacetate Acetate and the like are preferred. It is also possible to use a mixture of two or more of these.

As a coating method, methods used in ordinary coating operations can be applied, but preferred are, for example, a dipping method, a flow coating method, a spin-coating method, and the like.

The coating composition applied in this manner is generally cured by heating and drying.

The thickness of the cured film in the present invention is not particularly limited. However, from the viewpoint of maintaining adhesion strength and hardness, it is preferably used in a range of 0.1 to 20 microns. Particularly preferred is 0.4 to 1-0 microns.

S n, 02 or I n20 on these cured coatings
3/It is also possible to provide two or more thin films containing at least one layer of a transparent conductive film called S n 02 (ITO) by dry coating or liquid coating such as vacuum deposition or sputtering, as an anti-reflection and anti-static method. More preferred. Moreover, it is also preferable that the cured film has a sing glare property, and there is no problem.

Next, in the present invention, the organic coating that imparts antifouling properties and water repellency will be explained below.

Terminal silanol-containing Any organic polysiloxane having silanol at the terminal can be used as a film obtained from polysiloxane having silanol at the organic terminal. For example, polydimethyl having a silanol group at the terminal Polyalkyl, polyalkenyl, or polyarylsiloxanes such as siloxane, polymethylphenylsiloxane, and polymethylvinylsiloxane, and various crosslinking agents, such as tetraacetoxysilane.

Tetrafunctional silanes such as tetraalkoxysilane, tetraethylmethylketoximesilane, tetraisopropenylsilane, and trifunctional silanes such as alkyl or alkenyltriacetoxysilane, triketoximesilane, triisopropenylsilane, or trialkoxysilane, etc. Examples include coatings obtained by addition and mixing.

As a film obtained from a fluorine-containing polymer, any fluorine-containing polymer can be used, but among them, a perfluoro group-containing polymer represented by CnF2n+1 (n is an integer of 1 or more) is used. Particularly preferred are (meth)acrylate-containing polymers or siloxane polymers containing such perfluoro groups. Further, in the present invention, a polymer obtained by polymerizing a fluorine-containing monomer alone or a polymer obtained by copolymerizing it with another monomer is used. As the other monomer, any monomer that can be copolymerized can be used, but monomers into which various functional groups have been introduced for the purpose of crosslinking and curing are preferably used. Specific examples include hydroxyl group-containing monomers such as hydroxy (meth)acrylate, and carboxyl group-containing monomers such as (meth)acrylic acid. Furthermore, copolymers with monomers having double bonds having different reactivity, such as allyl (meth)acrylate, can also be mentioned as crosslinkable and curable examples. The polymerization form of such a copolymer is not particularly limited, and random copolymers, block copolymers, etc. are applicable, but block copolymers are preferred from the viewpoint of water repellency and improved adhesion to the object to be coated. is particularly preferably used.

In the composition of the above-mentioned terminal silanol-containing polysiloxane or fluorine-containing polymer, the purpose of accelerating curing is
Or various hardening agents for the purpose of making it hardenable, 3
Dimensional crosslinking agents can also be added. Specific examples of these include silicone resin curing agents, silane coupling agents,
Various metal alcoholates, various metal chelate compounds, isocyanate compounds, melamine resins, polyfunctional acrylic resins.

There are urea resins, etc.

Drying and/or curing methods for coating these organic films should be determined depending on the substance used, but usually include heat treatment at room temperature or higher and 100°C or lower, and furthermore, curable functional groups. For example, the double bonds in the polymer or oligomer can be used to cure the adhesive using radiation such as ultraviolet rays, electron beams, and gamma rays.

Next, as a coating method for such an organic film, methods used in normal coating work can be applied, but spin coating is preferred from the viewpoint of uniformity of antireflection effect and control of reflected interference color.

Dip coating, curtain flow coating, etc. are preferably used. In addition, from the viewpoint of workability, a method of impregnating a material such as paper or cloth with a liquid and applying and casting the liquid is also preferably used.

These organic coatings are usually applied diluted in volatile solvents. The solvent to be used is not particularly limited, but should be determined in consideration of the stability of the composition, wettability to inorganic substances, volatility, etc. Moreover, it is also possible to use not only one type of solvent but also a mixture of two or more types.

It is also possible to add various non-reactive substances to the organic coating composition of the present invention as long as other properties such as transparency and durability are not significantly degraded. Particularly for the purpose of improving flow during coating, the addition of the above-mentioned surfactant is effective.

In the present invention, the organic polysiloxane polymer,
In addition to the film made of a fluorine-containing organic substance, a conductive film or a cover film coated with the conductive film is used as RR'.
, 5iX3. A film obtained by treatment in an environment in which an organosilicon compound represented by
, R' each represents one selected from hydrogen, an alkyl group, a halogenated alkyl group, an allyl group, an aryl group, and a halogenated aryl group, and a represents 1- or 2.

Moreover, X is a hydrolyzable group. ) is also used.

In the above formula, when a is 2, the two R's may be the same or different.

In addition, the hydrolyzable group represented by X includes a halogen group, an alkoxy group, an amino group, an acyl group, a silazane group,
amide group, oxime group, di- or trialkoxy group,
A specific example thereof is a urea group. In addition, when X is an amino group, an amide group, a dioxime group, a di- or trialkoxy group, a urea group, etc., RR'aS
Two or more organosilicon substituents represented by i- in one molecule.
There is no problem even if the compound is doubled.

Among the compounds represented by the formula, trimethylsilyl, dimethylsilyl, and γ-(3,3,3-trifluoro)propyldimethylsilyl are preferred because they have a large anti-fouling effect and are excellent in antifouling properties. .

Organosilicon substituents such as phenyldimethylsilyl are particularly preferably used.

The above-mentioned organosilicon compounds having a boiling point of 50° C. to 250° C. are preferably used from the viewpoint of uniform treatment and ease of handling. In particular, silazane compounds, especially disilazane compounds, acetamide compounds, and lower alkoxy compounds, are more preferably applied because they are easy to operate after treatment and have relatively little odor.

Such organosilicon compounds can be used alone or in combination of two or more, or can be treated in stages using two or more.

Specifically, the treatment in an environment containing the organosilicon compound includes immersion in the organosilicon compound or exposure to its vapor.

Treatment time, treatment temperature, etc. should be determined depending on the purpose and substrate, but the treatment time is usually 1 minute to 2 minutes.
For 0 hours, the treatment temperature is in the range of 1-0°C to 1.00°C.

FIG. 6 is a sectional view showing the structure of the pressure-sensitive input tablet before it is pressed by the pen tip. In FIG. 6, , is an organic film, 1 is a transparent plastic film, 4 is an insulating spacer, and 1-O is an input pen tip. 2 and 6 represent transparent conductive films formed on a film, transparent plastic, or glass. When the input pen 10 presses the organic coating, the particles 4 are deformed and the conductive film 2 comes into contact with the conductive film 6 through the gap between the particles, thereby creating electrical continuity.

The particle size of the fine particles 4 is smaller than the distance between the second conductive film 2 and the lower conductive film 6, and the number average particle size is 0.1 to 100 μm.

From the viewpoint of transparency, those having a number average particle size of 5 to 50 μm are preferably used. In addition, the number average particle size of the conductive film 2
The distance between the conductive film 6 and the conductive film 6 is preferably 10% to 75% from the viewpoint of continuous drawing performance. That is, the conductive film 2 and the conductive film 6
It is preferable that the interval is 30 to 140 μm from the viewpoint of minimizing film deflection.

The coordinates of the position where conduction occurs can be determined using a known method (for example, [Electronic and Communication Academic Technical Research Report J IE7- 17. May 1979).

The method for manufacturing the pressure-sensitive input tablet of the present invention is appropriately selected depending on the materials used in each part and the size and shape of the tablet, but in particular, uniformity of the insulating spacer on the conductive film, Moreover, dispersion coating properties are important from the viewpoint of pressure sensitivity control, and upon coating, Freon dispersions such as Spin Code and Spray Co. 1 to 1 are preferably used. In addition, in the present invention,
The number of particles can generally be measured by observing with a microscope. Further, the number per unit area can be counted using a micro gauge. Although there are agglomerated particles in the existence state of particles, they are counted in units of primary particles from the viewpoint of insulation function. In addition, the area ratio occupied by particles is the apparent area of particles present in the unit area of the conductive film 6 in FIG. 3 (number of particles x maximum cross-sectional area per particle).
It is determined by the ratio of The cross-sectional area can be calculated as (πR2/4), where R is the maximum diameter of the particle. The number average particle diameter and distribution state can be easily measured using an image analyzer.

In this way, the transparent tablets obtained can be used for a variety of new end uses beyond those for which existing tablets are used.

For example, by inputting the road shape to the destination on a road map, information for autonomous driving could be provided to the car's computer. Also, by placing it on the second side of the flat display, it is also possible to record and transmit information for corrections and additions to figures that are currently being manually performed. Alternatively, it can be used as a switchboard that can be stacked on top of the display and input in response to questions from the display can be made by directly touching the signal diagram on the display.

[Example] The present invention will be described in detail with reference to Examples below, but the present invention is not limited thereto.

Example 1 (1) Creation of untreated tablet Nesa glass (100 Ω/mouth) 2. Polyester adhesive fine particles with an average particle size of 25 μm (fine particles with a deformation amount of 45% when pressed at 20 kg/ci) at a concentration of 0.1% by weight. The Freon dispersion was made into a 300 PPM using a spin coater.
, and was applied in a dispersion manner for 3Q seconds. then 130°
It was heat-cured for 15 minutes in a dryer (C) and adhered to Nesa Glass to form a substrate.

When the dispersed state of the particle adhesive was observed using a microscope, the number of particles was 3/mm2, and the area ratio occupied by the particles was 2.0XIO'.

This substrate was covered with a conductive film (200 Ω/hole) with the conductive surface facing the substrate side, and adhesively fixed with double-sided tape to obtain a tablet with the conductive film untreated.

ρ) γ-glycidoxypropyltrimethoxysilane,
γ-glycidoxypropylmethyljethoxysilane cohydrolyzate In a reactor equipped with a rotor, 35.3 parts of γ-glycidoxypropyltrimethoxysilane and γ-glycidoxypropylmethyljethoxy 106.8 parts of silane was charged, and while stirring using a magnetic stirrer, 0.0 parts of silane was added.
23.6 parts of a 5N aqueous hydrochloric acid solution was added dropwise while maintaining the liquid temperature at 1-0°C, and stirring was continued for 30 minutes after the completion of the dropwise addition to obtain a hydrolyzate.

(3) Preparation of coating composition for cured film (2) above
185 parts of methanol, 1.1 part of acetylacetone I, and 2.5 parts of silicone surfactant were added and mixed to the cohydrolyzate, and further methanol-dispersed colloidal silica (average particle 12 ± 1-mμ, solid content 30%) 333 After adding 1-6.0 parts of aluminum acetylacetoner and stirring thoroughly, a coating composition was obtained.

(4) Coating on cover film On a polyester film with a thickness of 100 μm,
The coating composition prepared in (3) above was coated using bar coater No. 4.

Next, precuring was performed at 82°C for 12 minutes, and further curing was performed for 10 minutes.
After heating at 0° C. for 4 hours, a cover film with a cured coating was obtained.

(5) Preparation of coating composition for film imparting antifouling properties and water repellency To 10 parts of dimethylpolysiloxane (number average molecular weight 26,000) having silanol groups at both ends, add 10 parts of Isopar E, a hydrocarbon solvent. 136 parts of ethyltriacetoxysilane and 0.05 parts of dibutyltin acetate were each added and mixed, and the mixture was left at room temperature day and night. Thereafter, 648 parts of methyl isobutyl ketone and 432 parts of cyclohexanone were further added to obtain a coating composition.

(6) Creation of cover film having antifouling properties and water repellency The coating composition prepared in step (5) above was coated on the cover film having the cured film obtained in step (4) above using bar coater No. 4.

Thereafter, it was dried at room temperature day and night to obtain a cover film having antifouling and water repellent properties.

(2) Preparation of tablet The untreated tablet obtained in (1) was covered with the cover film obtained in (6) to complete a pressure-sensitive input tablet.

The light transmittance of this pressure-sensitive input tablet was about 75%. When the conductive film was pressed from above with a ballpoint pen with a diameter of 0.5 mm, conduction was achieved with a load of 30 gr when it was stationary. Furthermore, when the tablet was moved, a load of 70 g was applied and drawing was performed at a speed of 2 cm in J-seconds, resulting in continuous conduction immediately below the pen, and constant conductivity was obtained at any part of the tablet.

In addition, although I was able to input continuity with my fingers at any part of the device, no continuity occurred at all when I touched it with my fist.

When the durability of the drawing input of this pressure-sensitive input tablet was investigated, there was no change in the conduction performance even after 50,000 cycles under a load of 200 gr.

When this tablet was disassembled and the degree of damage to the conductive film and the drawing marks on the Nesa glass was observed, no damage to the conductive film was observed, and the change in resistance value was within 2%. Moreover, the fine particles maintained almost a spherical shape.

In addition, when touch input is performed on this surface film with a finger, fingerprints, hand marks, sweat, etc. are difficult to adhere to and can be easily wiped off, and even if water droplets are attached, they can be easily shaken off.
High surface hardness makes it difficult to get scratches.

Example 2 In Example 1, everything is as described in Example 1- except that (5) to (6) the preparation of a coating composition for a film imparting antifouling properties and water repellency and the creation of a cover film are obtained by the following method. I did the same thing.

Preparation of coating composition for film imparting antifouling properties and water repellency and preparation of cover film A solution consisting of 10 parts of hexamethyldisilazane and 10 parts of methyl isobutyl ketone was placed in a container at the bottom for one month, and the cured film was prepared. The cover film was hung and exposed to vapors of methyl isobutyl ketone and hexamethyl disilazane for 30 minutes to perform organosilicon compound treatment. When the tablet was evaluated, it was found that the same conductive performance as in Example 1 was obtained, and the surface layer film also had the same antifouling properties and water repellency.

Example 3 In Example 1, the same procedure as in Example 1 was carried out except that the coating composition for a film imparting antifouling properties and water repellency (5) was prepared by the method described below.

Preparation of a composition imparting stain resistance and water repellencyModieper F100 (product of NOF Corporation), which is an A-B type acrylic block copolymer containing a fluorinated alkyl group as one component;
Hydroxyl value 36, solid content 30% by weight) 20 parts of Coronate EH (product of Nippon Polyurethane Industries Co., Ltd.) methyl isobutyl ketone/cyclohexanone (40/60 weight ratio)
5.06 parts of a 15 weight percent solution and 0.34 parts of a 0.0001 percent solution of dibutyltin dilaurate (solvent: methyl isobutyl ketone-cyclohexanone = 40 to 60 (weight ratio)) were added and mixed and dissolved with stirring. A coating composition was obtained by diluting 1-02 parts of this solution with 135.2 parts of methyl isobutyl ketone and 202.8 parts of cyclohexanone.

When the tablet was evaluated, it was found that the same conductive performance as in Example 1 was obtained, and the surface layer film also had the same antifouling properties and water repellency.

Example 4 In Example 1, everything was carried out in the same manner as in Example 1 except that the cured film was not provided by operations (2) to (4).

The surface layer film had good stain resistance and water repellency.

Example 5 In Example 1-, the cover film was not provided, that is, the coating on the cover film 2 in (4) was applied directly onto the conductive film, and the antifouling properties and the antifouling properties in (5) and (6) were A tablet was obtained in the same manner as in Example 1, except that a film imparting water repellency was further provided thereon. The surface film of the obtained tablet had good stain resistance and water repellency.

[Effects of the Invention] The pressure-sensitive input tablet provided with an antifouling film and a water-repellent film obtained by the present invention has the following effects.

■ The surface film on the touch surface resists the adhesion of finger marks and limescale, and dirt can be easily wiped off.

■ There is no erroneous operation due to contact with the palm or elbow, and input can be made arbitrarily using a sharp writing instrument such as a pen or pencil, or the fingers of the hand, depending on the purpose and use.

■ It has excellent transparency and can be used by placing it on any image display.

[Brief explanation of the drawing]

FIG. 1 shows the conductive film of the pressure-sensitive input tablet of the present invention. FIG. 2 shows the microparticles of the pressure-sensitive input tablet of the present invention. FIG. 3 shows the conductive plate of the pressure sensitive input tablet of the present invention. FIG. 4 shows a conductive film with a cover film of the pressure sensitive input tablet of the present invention. FIG. 5 shows one embodiment of the pressure sensitive input tablet of the present invention. FIG. 6 shows a cross-sectional view of the pressure-sensitive input tablet of the present invention.

Claims (2)

[Claims] (1) A pressure-sensitive input tablet characterized in that at least the following elements A, B, and C are integrally laminated in this order. B. A conductive film having a conductive film disposed on the opposite side to the pressing side, and having a single layer or multiple layers of one type of organic coating selected from A, B and C below on the pressing side surface of the conductive film. A conductive film that is coated with a conductive film. A: a film obtained from an organopolysiloxane containing terminal silanol; B: a film obtained from a fluorine-containing polymer; C: the conductive film is treated in an environment in which an organosilicon compound represented by the general formula RR'_aSiX_3_-_a exists. A film obtained by
shows. Moreover, X is a hydrolyzable group. ) B. Fine particles having a number average particle diameter of 0.1 to 100 μm, deformable, and having insulating properties. A conductive plate having substantially no electrical conductivity between it and the conductive film (A) through the fine particles (c) and (b), and having a conductive film disposed on the surface in contact with the fine particles. (2) A pressure-sensitive input tablet characterized in that at least the following elements A, B, and C are integrally laminated in this order. B. A conductive film in which a conductive film is disposed on the opposite side of the pressing side and a cover film is provided on the pressing side,
A conductive film formed by coating the surface of the cover film with a single layer or multiple layers of one type of organic film selected from A, B and C below. A: a film obtained from an organopolysiloxane containing terminal silanol; B: a film obtained from a fluorine-containing polymer; C: the cover film is treated in an environment in which an organosilicon compound represented by the general formula RR'_aSiX_3_-_a exists. A film obtained by
shows. Moreover, X is a hydrolyzable group. ) B. Fine particles having a number average particle diameter of 0.1 to 100 μm, deformable, and having insulating properties. A conductive plate having substantially no electrical conductivity between it and the conductive film (A) through the fine particles (c) and (b), and having a conductive film disposed on the surface in contact with the fine particles.