JP6251501B2 - Input pen and retractable input pen using the same - Google Patents

Description

  The present invention relates to an input pen used in an input device capable of detecting a position by a change in electric quantity accompanying a change in capacitance and moving a cursor by touching an operation area with a pen tip of the input pen.

Conventionally, as for the pen tip of an input pen, if a conductive rubber is used for the pen tip, a core member made of a conductive metal, a conductive rubber attached to the front outer surface of the core member, a core member and a conductive material are used. An input pen is known in which a pen tip having conductivity is formed by a filler made of a gel material filled between conductive rubbers, and the pen tip is attached to a front end portion of a conductive shaft tube (patent) Reference 1).
In addition, an input pen in which a plurality of flexible conductive fibers are bundled and attached to the pen tip is known as one using conductive fibers for the pen tip. (See Patent Document 2).

Japanese Patent No. 4142276 Japanese Patent No. 5042159

  However, the input pen described above electrostatically changes the coordinate position of the operation portion of the operation area by causing the pen tip, such as conductive rubber, and the hand holding the cylinder, such as the shaft cylinder, to which the pen tip is attached to conduct. Since it becomes possible to detect by the change in the amount of electricity accompanying the change in the capacity, the outer cylinder to be used also requires a highly conductive material.

  By the way, recently, many touch panel type input devices such as liquid crystal panels have been commercialized, the sizes of which are various, and thin and short input pens considering portability, thickness and length considering ease of handling and operability. Many input pens have been proposed. On the other hand, when a highly conductive material is used for the cylinder to be used, the cost increases, and it is also a fact that the product weight, the cylinder shape, and the like are limited.

  The objective of this invention is providing the input pen excellent in electroconductivity which expanded the width | variety of the material and shape of a cylinder to be used.

In order to solve the above problems, the present invention
“1. An input pen used in an input device that detects a coordinate position of an operation portion in an operation region by a change in electric quantity accompanying a capacitance change and inputs a coordinate position of the operation portion, and the input pen is a hollow cylinder A conductive liquid composition containing at least a phosphate-based surfactant as an electrolyte is accommodated in the hollow cylindrical body, with a pen tip having conductivity in contact with the input device at the front of the cylindrical body And the arithmetic mean roughness of the surface in the front-end | tip contact part which contacts at least the said input device of the said pen point is 0.1-10.0 nm, The input pen characterized by the above-mentioned.
2. 2. The input pen according to claim 1, wherein the pen tip has a tip contact portion that contacts the input device in a surface shape or a spot shape having a contact area of 20 mm ² or less when the input device is operated.
3. The input pen according to item 1 or 2 , wherein the conductive liquid composition contains a polysaccharide as a thickener.
4). Any one of Items 1 to 3 , wherein the conductive liquid composition has a viscosity of 500 mPa · s or more at a shear rate of 1.92 (sec ⁻¹ ) in a 20 ° C. environment. The input pen described.
5). Input pen to no first term is disposed an input pen according to the barrel in any one of the fourth term, characterized by being capable input operation by gripping the outer cylinder.
6). The input pen according to any one of the first to fifth aspects is disposed in an outer cylinder, and a pen tip of the input pen can be projected and retracted from a front end opening of the outer cylinder. Input pen to be used. "

  The present invention has been able to provide an input pen with excellent conductivity that allows the cursor to move smoothly by touching with the pen tip while expanding the width of the material and shape of the cylinder used.

1 is a longitudinal sectional view showing an input pen of Example 1. FIG. FIG. 2 is an enlarged vertical cross-sectional view of a pen tip part partially omitted in FIG. 1. FIG. 10 is an enlarged vertical cross-sectional view of a pen tip part, a part of which is omitted, showing an input pen of Example 5. It is a longitudinal cross-sectional view which shows the appearance input pen of Example 6. FIG. It is a longitudinal cross-sectional view which shows the state which the pen tip in FIG. 4 protruded.

  As a feature of the present invention, in an input pen having a conductive nib at the front of a hollow cylindrical body, a conductive liquid composition comprising at least an ionic liquid and / or an electrolyte is accommodated in the hollow cylindrical body. It is to be.

  This is because the conductive liquid composition having conductivity at least consisting of an ionic liquid and / or an electrolyte is contained in the hollow cylindrical body, so that the conductivity of the hollow cylindrical body itself is not taken into consideration. When a finger holding the hollow cylindrical body is conductive through the conductive liquid composition, or when an input pen is accommodated in the outer cylinder, the outer cylinder is removed from the pen tip through the hollow cylindrical body through the conductive liquid composition. This is because it is possible to provide an input pen with excellent conductivity because it conducts to the gripped finger.

  The pen tip provided in the front part of the input pen used in the present invention is not limited as long as it has conductivity. Conductive rubber, stainless steel, aluminum, copper, titanium, iron, brass, bronze Metal materials such as carbon fiber materials, conductive resin materials such as carbon fiber materials, polyacetylene, polypyrrole, polythiophene and polyaniline, and composite conductive materials that provide electrical and electronic functions by adding conductors, mainly inorganic substances, to non-conductive resins A functional resin material or the like can be used. In order to improve the electrical conductivity and suppress the wear of the nib, those made of a metal material are preferable.

  Among them, stainless steel is preferable because chromium contained therein is combined with oxygen in the air to form a passive film on the surface and has high corrosion resistance. When the conductive pen tip is made of a metal material, the tip contact portion that contacts the input device when operating the pen tip, particularly the input device, so as not to damage the operation surface of the input device. In addition, it is preferable to make it easy to move the cursor smoothly by covering it with a carbonaceous film such as a diamond-like film (DLC film). Also, the pen tip can be covered with a conductive protective film to reduce the impact of the pen tip during input.

  Like the ball-point pen, the pen nib holds the ball at the front end of the nib body made of stainless steel, and the front end edge of the nib body is held inside to hold the ball freely. The ballpoint pen tip type is preferable. This can be preferably used because the cursor can move smoothly by rotating the ball. Further, by disposing the ball so that it can move back and forth, and disposing a resilient member that constantly presses the ball behind the ball, the ball moves backward during input to moderate the impact. It is preferable to do so. The elastic member is preferably conductive, and the pressing force of the elastic member is preferably 30 to 300 gf. When the elastic member is less than 30 gf, the impact absorbing power tends to be inferior. This is because it is difficult for the ball to rotate, and in consideration of 50 to 200 gf. If the movement distance of the front and rear of the ball is less than 20 μm, the impact absorbing power is small, and if it exceeds 200 μm, the touch during operation is reduced, so that it is preferably 20 μm to 200 μm, and more preferably 40 μm to 100 μm.

In order to prevent malfunction of the pen tip, it is preferable to provide a tip contact portion that makes contact with the input device in the form of a surface or a spot having a contact area of 20 mm ² or less. The shape of the tip contact portion is not particularly limited, but it is preferable that the tip contact portion is substantially spherical or arcuate so as not to damage the operation surface of the input device. Note that the contact area with the input device indicates an area when the tip contact portion of the pen tip of the input pen is brought into contact with the input device at 25 ° C., an input angle of 70 degrees, and an input load of 100 gf.

The tip contact portion of the nib preferably has an arithmetic average roughness (Ra) of 0.1 to 100.0 nm because if it exceeds 100.0 nm, the operation surface of the input device is likely to be damaged. In consideration, 0.1 to 10.0 nm is preferable. Arithmetic average roughness (Ra) is a reference in the direction of the average line from a roughness curve measured by a surface roughness measuring instrument (model name SPI3800N manufactured by Seiko Epson Corporation) as shown in (Equation 1). The length L is extracted, and the absolute values of deviations from the average line of the extracted portion to the measurement curve are summed and averaged.
(Formula 1)

  In addition, the pen tip is preferably thinner in order to prevent malfunction of the input device from the viewpoint of visibility, and may be a pipe shape or a bar wire shape. In order to obtain this, it is most preferable to use a taper shape such as a bullet shape, a pointed shape, or a step shape. The size of the nib is not particularly limited, but if the maximum outer diameter or the maximum width of the cross section is larger than 10 mm, the visibility tends to decrease, and if it is smaller than 0.5 mm, the strength of the nib tends to decrease. 0.5 to 10 mm, more preferably 1 to 5 mm.

  In addition, the shape and material of the hollow cylindrical body used in the present invention can be appropriately selected and used regardless of the presence or absence of conductivity. Examples of materials having conductivity include stainless steel, aluminum, copper, and titanium. Electrical / electronic by adding conductive materials, mainly inorganic substances, to metal materials such as iron, brass and bronze, conductive resin materials such as polyacetylene, polypyrrole, polythiophene and polyaniline, carbon fiber materials and non-conductive resins Examples thereof include a composite conductive resin having a function. Examples of non-conductive materials include resins called non-conductive or extremely low conductive insulating materials such as polypropylene, polycarbonate, and ABS resin. In consideration of cost, productivity of the hollow cylindrical body, workability, etc., it is preferable to use a non-conductive material such as polypropylene, polycarbonate, ABS resin.

  Further, as described above, the hollow cylindrical body of the input pen can be appropriately selected and used regardless of the presence or absence of conductivity. However, when a non-conductive material is used as the hollow cylindrical body, If the thickness of the cylindrical body is thicker than 2 mm, the conductivity due to the conductive liquid composition tends to decrease, and if it is thinner than 0.05 mm, the strength of the hollow cylindrical body tends to decrease. In consideration, 0.1 to 1 mm is preferable. Further, the amount of the conductive liquid composition to be stored is not particularly limited, but it is preferable to contain 0.1 g or more in order to obtain necessary conductivity.

  The hollow cylindrical body of the input pen may have an opening at the front end and / or the rear end, but in order to make it easier to accommodate the conductive liquid composition in the hollow cylindrical body, it is preferable to open both ends. In the hollow cylindrical body opened at both ends, a highly viscous liquid stopper or a solid stopper is disposed behind the conductive liquid composition in order to prevent leakage of the contained conductive liquid composition. In addition, as described above, the pen tip is preferably thinner in order to prevent malfunction of the input device from the viewpoint of visibility, but in order to attach the pen tip directly to the front end portion of the hollow cylindrical body. It is necessary to make only the front end portion or the whole of the hollow cylindrical body thinner. However, if the front end portion of the former hollow cylindrical body is made thin, it becomes difficult to manufacture and the manufacturing cost may increase. If the latter hollow cylindrical body is thinned as a whole, it is accommodated as described above. There is a possibility that the amount of the conductive liquid composition is reduced and the conductivity is lowered. Therefore, it is preferable to place a pen tip holder between the pen tip and the hollow cylindrical body. The highly viscous liquid stopper, solid stopper, and pen tip holder are preferably made of a conductive material.

  The ionic liquid in the present invention is also called a room temperature molten salt or simply a molten salt, and is a salt of a cation and an anion showing a molten state in a wide temperature range including room temperature (room temperature). This is because when the ions constituting the salt are replaced with organic ions having a relatively large size, the melting point becomes low, and it exists in a liquid state even near room temperature.

  The ionic liquid used in the present invention is a salt composed of a cation component and an anion component, and examples of the cation component include imidazolium, pyridinium, hyperidinium, pyrazonium, pyrrolidinium, pyrrolium, ammonium, phosphonium and the like. In addition, anionic components of ionic liquid compounds include halogen (chlorine, bromine, iodine, etc.), tetrafluoroborate, hexafluorophosphate, trifluoromethanesulfonate, bis (fluorosulfonyl) imide, bis (trifluorosulfonyl) imide, tri (tri Fluorosulfonyl) carbanion, trifluoroacetate, hydrofluoride anion and the like. By dissolving these ionic liquids in a solvent such as water, a liquid composition having excellent conductivity can be obtained. You may use these individually or in mixture of 2 or more types.

  Examples of the electrolyte used in the present invention include halides such as chlorides, fluorides, bromides, and iodides of alkali metals and alkaline earth metals. Specific examples include sodium halide, potassium halide, halogen Alkali metal halides such as lithium halide, and alkaline earth metal halides such as magnesium halide and calcium halide. By dissolving these electrolytes in a solvent such as water, a liquid composition having excellent conductivity can be obtained. You may use these individually or in mixture of 2 or more types.

  Among these ionic liquids and electrolytes, in the conductive liquid composition, since the ionic liquid is expensive, it is preferable to use an electrolyte. In particular, a compound having an alkali metal ion is excellent in stability. It is preferable to use alkali metal halides such as bromide and iodide.

  Further, if the content of the electrolyte solution is less than 0.1% by weight relative to the total amount of the conductive liquid composition, it is difficult to obtain good conductivity, and if it is 30.0% by weight or more, it is difficult to dissolve in the solvent. 0.1 to 30.0% by mass is preferable. Furthermore, if considered more, 0.5-20.0 mass% is more preferable, and if considered most, 3.0-15.0 mass% is most preferable.

  In the present invention, a solvent may be used, and water or a glycol system such as ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, polyethylene glycol, glycerin, etc. in consideration of dissolution stability of the ionic liquid and / or electrolyte. Solvent, methanol, ethanol, 1-propanol, 2-propanol, isopropanol, isobutanol, t-butanol, propargyl alcohol, allyl alcohol, 3-methyl-1-butyn-3-ol, ethylene glycol monomethyl ether acetate and others Alcohol solvents such as higher alcohols, glycols such as ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, 3-methoxybutanol, 3-methoxy-3-methylbutanol And ether-based solvents. You may use these individually or in mixture of 2 or more types.

  The content of the solvent is preferably 50.0% by mass or more with respect to the total amount of the conductive liquid composition in view of dissolution stability, and more preferably 70.0% by mass or more in consideration.

  In order to prevent leakage of the conductive liquid composition in the hollow cylindrical body, it is preferable to use a thickener in the conductive liquid composition. It is possible to prevent leakage of the conductive liquid composition by increasing the viscosity of the conductive liquid composition. If the leakage of the conductive liquid composition occurs, the input device Cause a malfunction.

  For thickeners, synthetic polymers such as polyacrylic acid and its cross-linked polymers, polyvinylpyrrolidone and polyvinyl alcohol, xanthan gum, welan gum, succinoglycan, sylum pseudogum, guar gum, locust bean gum, and diyutane Examples thereof include polysaccharides such as gum, alkasy gum, gelatin, alginic acid, and carrageenan, and celluloses such as methyl cellulose, ethyl cellulose, hydroxypropyl cellulose, hydroxymethyl cellulose, carboxymethyl cellulose, and salts thereof. Among these, since it is possible to increase the viscosity with a small amount and to prevent leakage of the conductive liquid composition, it is preferable to use a polysaccharide. You may use these individually or in mixture of 2 or more types.

  If the content of the thickener is less than 0.1% by mass with respect to the total amount of the conductive liquid composition, it is difficult to obtain the leakage preventing effect of the conductive liquid composition, and even if it exceeds 5.0% by mass. Since the leakage preventing effect of the conductive liquid composition does not change, 0.1 to 5.0% by mass is preferable. Considering more, 0.3 to 3.0% by mass is preferable.

The viscosity of the conductive liquid composition is not limited, but considering the leakage suppressing effect of the conductive liquid composition, it is better to set the viscosity to 500 mPa · s or more at a shear rate of 1.92 sec ⁻¹ . Preferably, considering more, it is 2000 mPa · s or more.

  In the present invention, it is preferable to contain a colorant. This is because it is easy to visually control whether the conductive liquid composition is contained in the hollow cylindrical body by coloring the conductive liquid composition in the manufacturing process. The colorant is not particularly limited, and examples of the pigment include inorganic, organic, processed pigments, and the like. Specifically, carbon black, aniline black, ultramarine, yellow lead, titanium oxide, iron oxide, phthalocyanine series, Azo-based, quinacridone-based, quinophthalone-based, selenium-based, triphenylmethane-based, perinone-based, perylene-based, goxazine-based, aluminum pigment, pearl pigment, fluorescent pigment, phosphorescent pigment, complementary color pigment and the like. As the dye, direct dyes, acid dyes, basic dyes, metal-containing dyes, various salt-forming dyes, and the like can be used. In addition, by using a microcapsule pigment in which a colored body in which a pigment is dispersed in a medium as a colored resin particle body is encapsulated in a shell made of a resin wall film-forming substance by a known microencapsulation method or the like, or solidified Also good. Further, colored resin particles in which the pigment is covered with a transparent or translucent resin or the like, or colored resin particles or colorless resin particles colored with a pigment or a dye can also be used. These pigments and dyes may be used alone or in combination of two or more. The content is preferably 0.1 to 20.0 mass% with respect to the total amount of the ink composition.

Among these colorants, it is preferable to use a pigment in consideration of conductivity, and carbon black is preferable in consideration of the conductivity. Examples of carbon black include carbon black such as furnace black, channel black, and acetylene black. Among these carbon blacks, the DBP oil absorption is preferably 50 to 600 ml / 100 g. This is because when the DBP oil absorption is 50 ml / 100 g or more, high conductivity is easily obtained with a small amount, but when the DBP oil absorption exceeds 600 ml / 100 g, the dispersibility of the carbon black is easily affected. In consideration of conductivity, the DBP oil absorption is preferably 300 to 600 ml / 100 g. Specifically, Printex 45, Printex 60, Printex 70, Printex 90, Printex 95 (Degussa Co., Ltd.), # 33, MCF88, # 3950B (Mitsubishi Chemical Industry Co., Ltd.) and the like can be mentioned. .
The oil absorption amount of carbon black is a characteristic indicating the structure of carbon black, and is an amount by which a certain amount of dried carbon black absorbs DBP (dibutyl phthalate) and is measured by a test method defined in JISK6221. .

  Moreover, the input pen of the present invention can accommodate an input pen in an outer cylinder and can perform an input operation by holding the outer cylinder. The material of the outer cylinder can be appropriately selected and used depending on the presence or absence of conductivity depending on the conductive liquid composition contained in the hollow cylinder. Conductive materials include metal materials such as stainless steel, aluminum, copper, titanium, iron, brass, and bronze, conductive resin materials such as polyacetylene, polypyrrole, polythiophene, and polyaniline, carbon fiber materials, and non-conductive resins. Examples thereof include composite conductive resins that are provided with electrical and electronic functions by adding a conductor mainly composed of an inorganic substance. Examples of the non-conductive material include resins called non-conductive or extremely low conductive insulating materials such as polypropylene, polycarbonate, and ABS resin. In consideration of cost, outer cylinder productivity, moldability, and shape freedom, it is preferable to use non-conductive materials such as polypropylene, polycarbonate, and ABS resin. In addition, it is preferable that a hollow cylinder and an outer cylinder adjoin or contact in consideration of electroconductivity.

Next, an Example is shown and this invention is demonstrated.
The input pen of Example 1 shown in FIG. 1 and FIG. 2 has an arithmetic average roughness (Ra) of 5 on the surface to be the tip contact portion 4a at the tip of the hollow cylindrical body 2 made of polypropylene which is a nonconductive resin. A nib 4 having a conductive ball tip diameter of 1.0 mm and a nib 4 rotatably held by a conductive nib body made of stainless steel is attached to the nib holder 3 having conductivity. The rear end portion 3b which is attached to the front end portion 3a and the pen point holder 3 is closed is press-fitted into the hollow cylindrical body 2. In the hollow cylindrical body 2, the input liquid 1 is obtained by directly packing the conductive liquid composition 7 of the formulation example 1 and the grease-like liquid stopper 8. A tail plug is attached to the rear end of the hollow cylindrical body 2. In addition, an electrically conductive elastic member (coil spring) 9 that always presses the ball 5 is disposed behind the ball 5. The pressing force of the elastic member (coil spring) was 50 gf, the moving distance of the ball 5 in the front-rear direction was 100 μm, and the maximum diameter L of the cross section of the nib 4 was 3 mm.

  In order to use the input pen 1 of Example 1, the hollow cylindrical body 2 containing the conductive liquid composition 7 of Formulation Example 1 is held with a finger, and the operation area of the input device (not shown) is set as the input pen 1. When the ball 5 of the pen tip 4 is touched, the ball 5 passes through the pen tip 4, the resilient member 9, the pen tip holder 3, and the conductive liquid composition 7 to conduct electricity to the finger holding the hollow cylindrical body 2. Cursor operation.

  The conductive liquid composition 7 of Example 1 was obtained by stirring water, an electrolyte (sodium chloride), a preservative, and a fungicide using a mixing stirrer at 50 ° C. to obtain a conductive liquid composition. Specific blending amounts are as follows.

Conductive liquid composition formulation example 1
94.0 parts by weight of water
Electrolyte (sodium chloride) 5.0 parts by mass
Rust preventive (benzotriazole) 0.5 parts by mass
Antibacterial agent (1,2 benzoisothiazolin-3-one) 0.5 parts by mass

Examples 2-4
In Examples 2 to 4, the conductive liquid compositions of Formulation Examples 2 to 4 obtained in the same procedure as Formulation 1 except that the conductive liquid composition was changed as shown in Table 1, In the same manner, it was accommodated in the hollow cylindrical body 2 to obtain input pens of Examples 2 to 4. However, the conductive liquid composition of Example 2 was mixed and stirred using a homogenizer stirrer with a thickener in the final blending step and heated to a uniform state, and then a filter paper was used. Filtration was performed to obtain a conductive liquid composition of Formulation Example 2 used in Example 2. Table 1 shows the composition of the conductive liquid compositions of Formulation Examples 2 to 4.

  FIG. 3 shows an input pen 21 according to the fifth embodiment. The input pen 21 has a conductive pen tip 24 made of a stainless steel material at the tip of a hollow cylindrical body 2 made of polypropylene which is a non-conductive resin containing the conductive liquid composition 7 of Formulation Example 1. The input pen 21 is obtained in the same manner as in Example 1 except that it is provided via a pen tip holder 23 made of polypropylene, which is a conductive resin. The maximum diameter L of the cross section of the nib 24 was 3 mm.

  4 and 5 show a retractable input pen 31 according to the sixth embodiment. The input pen 31 includes the input of the first embodiment in an outer cylinder body in which a front outer cylinder 32 made of non-conductive polypropylene and a rear outer cylinder 33 made of non-conductive polycarbonate are detachably screwed. The pen 1 is urged and housed rearwardly by the elastic material 34, and the pen tip of the input pen 1 is pressed by pressing the knock body 35 by the retracting mechanism by the rotating cam 36 provided in the rear outer cylinder 33. 4 is a retractable input pen 31 that can be protruded and retracted from the front end opening 32 a of the front outer cylinder 32. The rear outer cylinder 33 is provided with a clip 37, and a grip 38 made of a non-conductive olefin-based thermoplastic elastomer is attached to the front outer cylinder 32.

  In order to use the input pen 31 of the sixth embodiment, the gripping portion (grip 38) of the front outer cylinder 32 of the outer cylinder main body that houses the input pen 1 is gripped with a finger, and the operation area of the input device (not shown) Is touched by the ball 5 of the pen tip 4 of the input pen 31 through the pen tip 4, the resilient member 9, the pen tip holder 3, the conductive liquid composition 7, the front outer cylinder 32, and the grip 38. The cursor can be operated by conducting electricity to the finger holding the grip 38.

Comparative Examples 1-3
As shown in Table 1, except that the conductive liquid composition was changed, the conductive liquid compositions of Formulation Examples 5 to 7 obtained by the same procedure as Formulation Example 1 were used in the same manner as in Example 1 to obtain a hollow cylindrical body. The input pens of Comparative Examples 1 to 3 are obtained. However, Comparative Example 2 was sufficiently mixed and stirred using a homogenizer stirrer while adding and thickening the thickener in the final blending step, except that it was changed as shown in Table 1. Then, it filtered using the filter paper and the electroconductive liquid composition of the compounding example 6 used for the comparative example 2 is obtained. Table 1 shows the composition of the conductive liquid compositions of Formulation Examples 5 to 7.

  In Examples 1 to 6, since the input pen is excellent in conductivity, smooth cursor movement can be achieved. As a result of observing the operation of the input device with the input pen, the input device and the conductive pen tip were in contact with each other in the form of dots.

  In Comparative Examples 1 to 3, since no ionic liquid and / or electrolyte was contained, the conductivity was poor, and even when the operation area of the input device was touched with the pen tip of the input pen, the cursor could not be moved.

  For the nib holder, an internal hole may be provided to penetrate the front and rear of the nib holder so that the conductive liquid composition in the hollow cylindrical body can be transmitted to the nib through the inner hole. Considering prevention of leakage of the liquid composition, it is preferable to provide a leakage prevention plug without providing a penetrating internal hole and making it more difficult for the conductive liquid composition to leak.

  The pen tip having conductivity of the input pen can be used as an input pen that can move the cursor smoothly by being excellent in conductivity.

1,31 Input pen
2 Hollow cylindrical body
3 Nib holder
3a, 23 a Front end
3b, 23 b rear end
4, 24 nib
4a, 24a Tip contact area
5 balls
6 Tail plug
7 Conductive liquid composition
8 Liquid stopper
9 bullet members
32 Front outer cylinder
32 a Front end opening
33 Rear outer cylinder
34 bullet material
35 knock body
36 Rotating cam
37 clips
38 grip
L The maximum diameter of the cross section of the nib 24

Claims (6)

An input pen for use in an input device that detects a coordinate position of an operation portion of an operation region by a change in electric quantity accompanying a capacitance change and inputs a coordinate position of the operation portion, wherein the input pen is a hollow cylindrical body in front, with comprises a nib having conductivity in contact with the input device, to the hollow cylindrical body, containing a conductive liquid composition comprising a phosphoric acid ester surfactant as a least an electrolyte, wherein An input pen characterized in that the arithmetic average roughness of the surface of at least a tip contact portion of the pen tip that contacts the input device is 0.1 to 10.0 nm . ^2. The input pen according to claim 1, wherein the pen tip has a tip contact portion that comes into contact with the input device in a planar shape or a spot shape having a contact area of 20 mm ² or less when the input device is operated. Wherein the conductive liquid composition, an input pen according to claim 1 or 2, characterized in that it contains a polysaccharide as a thickener. The viscosity of the conductive liquid composition is 500 mPa · s or more at a shear rate of 1.92 (sec ^-1 ) in a 20 ° C environment, according to any one of claims 1 to 3 . Input pen. An input pen according to any one of claims 1 to 4 , wherein the input pen is disposed in an outer cylinder, and an input operation is possible by gripping the outer cylinder. An input pen according to any one of claims 1 to 5 , wherein the input pen is disposed in an outer cylinder, and a pen tip of the input pen is allowed to protrude and retract from a front end opening of the outer cylinder. pen.

Images