JP2019185653A - Lead for electronic pen - Google Patents

Abstract

To prevent an electronic pen from becoming defective or operating abnormally due to penetration of saliva by avoiding repeated bad habits of biting, holding in the mouth, or licking an electronic pen.SOLUTION: The present invention relates to a lead 3 formed in the shape of a bar, which protrudes at one end from the opening in an end of the electronic pen 1 when attached to the electronic pen 1 for usage. The lead 3 is provided with an air hole Pr or voids GPa and GPb from the end protruding from the electronic pen 1 in the axial direction of the axis, and is also provided with bitter substance in the end by immersing the bitter substance by a capillary phenomenon.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an electronic pen core used for an electronic pen that realizes a function as a position indicator for a position detection device mounted on an information processing apparatus such as a tablet PC (Personal Computer).

  Conventionally, a hard resin such as POM has been used for the core of the electronic pen. In this way, using an electronic pen with a hard resin core, an operation input is made to a position detection sensor (coordinate detection sensor) in which a plate-like resin or glass is provided as a protective material on the position detection surface. I was going. However, when an input operation is performed on a plate-shaped resin or glass protective material using an electronic pen using a hard resin core, the electronic pen may slip and input may be difficult.

  For this reason, various devices have been made for the core of the electronic pen. Specifically, there is a core formed by bundling synthetic fibers, which is made elastic by providing a gap between the synthetic fibers in the axial direction. In the case of an electronic pen using a core bundled with synthetic fibers, when the core of the electronic pen comes into contact with the protective material on the position detection surface of the position detection sensor, a soft touch can be obtained and the electronic It is also possible to prevent the pen from slipping.

  Also, there are cores made of synthetic resin such as plastic, which are provided with elasticity by providing pores of various shapes in the axial direction. The gaps formed in the axial direction of the core formed by bundling synthetic fibers and the pores of various shapes formed in the axial direction of the core formed of synthetic resin are originally made of so-called inking pen ink. It was for deriving to the nib. The writing quality of the electronic pen is improved by using it as the core of the electronic pen without putting ink in these voids and pores.

Japanese Patent Laid-Open No. 2-6196 JP 2003-25783 A JP 2011-20443 A

  In recent years, tablet PCs using electronic pens have been used in learning systems for children and students. Conventionally, elementary school children in the lower grades may perform a “claw” action of “biting a pen”, “holding a pen”, and “licking a pen”. The operation of “癖” is the same when the electronic pen is used, and the electronic pen may be bitten, pinched, or licked. If the side where the lead of the electronic pen protrudes is bitten, pinched, or licked, it is considered that saliva may penetrate into the pen from the opening of the electronic pen where the lead protrudes.

  Since an electronic circuit or the like is disposed inside the electronic pen, it is considered that the electronic pen may not operate normally or may cause a failure due to the ingress of moisture. In particular, as described above, in the case of a core formed by bundling synthetic fibers and having a gap in the axial direction or a core formed of synthetic resin and having pores in the axial direction, capillary action Saliva can easily enter the electronic pen body through the voids and pores.

  In view of the above, the present invention prevents repeated operation of a heel that bites, barks, or licks the electronic pen, and effectively prevents malfunction or failure of the electronic pen due to saliva penetration. An object of the present invention is to provide a lead for an electronic pen.

To solve the above problem,
A rod-shaped core for an electronic pen,
When attached to the electronic pen, one end protrudes from the opening of the tip of the electronic pen,
A pore or void is provided in the axial direction from the one end,
Provided is a pen for an electronic pen characterized in that a bitter substance is infiltrated by capillary action at least on one end side.

  According to the lead for the electronic pen, the lead is formed in a rod shape. When the lead is attached to the electronic pen, one end of the lead is used by protruding from the opening of the end of the electronic pen. The The core is provided with pores or voids in the axial direction from one end protruding from the electronic pen, and a bitter substance is soaked into the one end side by capillary action. This prevents the portion of the electronic pen from protruding the core from being repeatedly bitten, pinched, or licked, and prevents saliva from penetrating into the electronic pen.

It is a figure for demonstrating the structural example of the electronic pen of embodiment. It is a figure for demonstrating the structural example of the other electronic pen of embodiment. It is a figure for demonstrating the specific structural example of the core of embodiment. It is a figure for demonstrating the case where a bitter substance is osmose | permeated to a core. It is a figure for demonstrating the other example of the external appearance shape of a core.

  Hereinafter, an embodiment of a core for an electronic pen according to the present invention will be described with reference to the drawings. Examples of position detection devices that can be input using an electronic pen include an electromagnetic induction method (EMR (Erector Magnetic Resonance technology) method) and an active electrostatic coupling method (AES (Active Electrostatic) method). The lead for the electronic pen according to the present invention can be applied to an electronic pen corresponding to any type of position detection device. In the following, a specific example will be described in which the electronic pen core of the present invention is applied to an electronic pen used for an electromagnetic induction type position detecting device.

[Configuration example of an electromagnetic induction electronic pen]
The electromagnetic induction type position detection device includes a sensor unit formed by arranging a plurality of coils in length and width, a transmission period in which power is sequentially supplied to the plurality of coils to generate a magnetic field, and power supply is stopped. And a configuration in which reception periods for receiving a magnetic field from the outside are alternately provided. The electronic pen corresponding to the position detection device includes a resonance circuit including a coil and a capacitor, and generates a signal by causing a current to flow through the coil in accordance with a magnetic field from the position detection device. The transmission is provided.

  As a result, the electromagnetic induction type position detection device supplies electric power to the electronic pen during the transmission period, thereby enabling the electronic pen to be driven. The electromagnetic induction type position detection device can detect the indication position by the electronic pen and the writing pressure applied to the electronic pen by receiving the oscillation signal from the electronic pen during the reception period. Hereinafter, a configuration example of the electromagnetic induction electronic pen according to this embodiment will be described.

  FIG. 1 is a diagram for explaining a configuration example of the electronic pen 1 according to the embodiment, and is a cross-sectional view of the main part on the pen tip side when the electronic pen 1 is divided into two in the axial direction (longitudinal direction). is there. In addition, the core 3 and the circuit board 9 are not the cross section, but have shown the state attached to the inside of the electronic pen 1. FIG. As shown in FIG. 1, the electronic pen 1 includes a cylindrical housing 2 that is gripped by the user on the outermost side. The inside of the housing 2 is hollow, and various components other than the core 3 described later are mounted from an opening provided at the end opposite to the pen tip side.

  As shown in FIG. 1, the end portion of the housing 2 on the pen tip side is formed in a tapered shape, and the tapered tip is an opening. The core 3 is inserted from this opening and mounted in the housing 2. The core 3 is formed in a rod shape as a whole, and includes a shaft portion 31 and a pen tip 32 whose tip is rounded. In the state in which the core 3 is mounted in the housing 2, the pen tip 32 projects from the opening at the tapered tip of the housing 2. In this embodiment, the core 3 has a cylindrical shape, and the pen tip 32 has a slightly longer diameter than the shaft portion 31.

  A cylindrical ferrite core 4 is provided around the shaft portion 31 of the core 3 mounted in the housing 2, and a coil 5 for a resonance circuit is wound around the side surface of the ferrite core 4. The end of the ferrite core 4 on the pen tip side is engaged with the inner wall on the front end side of the housing 2, and the opposite end is inserted and held in the insertion port of the first holding member 6. In the first holding member 6, a through hole having a diameter shorter than the diameter of the insertion port and longer than the diameter of the shaft portion 31 of the core 3 is formed continuously from the insertion port. The shaft portion 31 of the core 3 passes through the insertion port and the through hole of the first holding member 6, penetrates the first holding member, and reaches the writing pressure detection unit 8.

  The writing pressure detection unit 8 includes a core body holding unit 81, a pressing member 82, a first electrode 83, a spring 84, a dielectric 85, and a second electrode 86, and these are the holding members for the writing pressure detection unit. It is provided in the holding member 7. The second holding member 7 is connected to the first holding member 6. The core body holding portion 81 includes a fitting hole having a diameter slightly smaller than the diameter of the shaft portion 31 of the core 3, and an end portion on the opposite side to the pen tip side of the shaft portion 31 of the core 3 is inserted therein. The shaft portion 31 is held so that it cannot be easily removed. However, the core 3 can be removed from the core body holding portion 81 by pinching the nib 32 of the core 3 and applying a predetermined force or more. That is, the core 3 is detachable from the electronic pen 1.

  A pressing member 82 is provided in contact with the core body holding portion 81. The pressing member 82 is a hard disk-shaped member, and can be pressed by the core 3. A first electrode 83 is provided in contact with the pressing member 82. The first electrode 83 is formed of an elastic conductive material such as conductive rubber, for example, and has a cylindrical shape whose end opposite to the core 3 is rounded. A disc-shaped dielectric 85 having a surface facing the first electrode 83 is provided at a position slightly away from the first electrode 83, and the second electrode 86 is provided in contact with the other surface of the dielectric 85. A coiled spring 84 is provided between the pressing member 82 and the dielectric 85 and around the first electrode 83.

  The circuit board 9 is connected to the end of the second holding member 7 opposite to the pen tip. Although not shown, the circuit board 9 is provided with an electronic circuit formed by connecting a capacitor or a control circuit having an IC (Integrated Circuit) configuration. Although not shown in FIG. 1, both ends of a coil wound around the side surface of the ferrite core 4 are connected to a capacitor on the circuit board 9 to constitute a resonance circuit. Further, the first electrode 83 and the second electrode 86 constituting the writing pressure detection unit 8 are connected to a control circuit on the circuit board 9 so that the writing pressure can be grasped.

  The circuit board 9 is fixed to a cap that is fitted into the opening at the end of the electronic pen 1 opposite to the pen tip side. Accordingly, the position of the ferrite core 4, the first holding member 6, the second holding member 7 in which the writing pressure detection unit 8 is accommodated, and the circuit board 9 are connected in series, and the position is fixed in the housing 2. Is done. In the writing pressure detection unit 8, the pressing member 82 and the core body holding unit 81 in contact with the pressing member 82 are always on the pen tip 32 side by the coiled spring 84 provided between the pressing member 82 and the dielectric 85. Is being energized. Accordingly, the core 3 in which the shaft portion 31 is held by the core body holding portion 81 is also always urged toward the pen tip 32 side.

  In this manner, the core 3 can be pushed in the axial direction by the action of the spring 84 of the writing pressure detection unit 8, or can be pushed out by the force of the spring 84. Accordingly, when pen pressure is applied to the nib 32 of the lead 3, the lead 3 is pushed into the housing 2, and the first electrode 83 of the writing pressure detection unit 8 approaches the dielectric 85, and sandwiches the dielectric 85. The capacitance between the first electrode 83 and the second electrode 86 changes. By detecting this change in capacitance, the pen pressure can be detected. When the writing pressure applied to the core 3 is released, the core 3 returns to the original state by the force of the spring 84.

[Configuration example of other electronic pens with electromagnetic induction]
FIG. 2 is a diagram for explaining a configuration example of another electronic pen 1A according to the embodiment. Similarly to the case of FIG. 1, the electronic pen 1A is divided into two in the axial direction (longitudinal direction). It is sectional drawing of the principal part by the side of a pen point. In the case of FIG. 2, the pen tip side portion is shown in an enlarged manner than that shown in FIG. 1. Further, in the electronic pen 1A of FIG. 2, the same reference numerals are assigned to the same components as those of the electronic pen 1 shown in FIG. For this reason, in the electronic pen 1 </ b> A shown in FIG. 2, the description of the parts having the same reference numerals as those of the electronic pen 1 shown in FIG.

  As shown in FIG. 2, when the pen tip portion of the electronic pen 1 </ b> A is enlarged, a gap is formed between the tapered opening 2 a at the end of the housing 2 and the pen tip 32 of the core 3. Arise. For this reason, when the pen tip 32 side of the electronic pen 1 </ b> A is bitten, squeezed or licked, saliva penetrates into the inside of the housing 2, for example, a coil wound around the side surface of the ferrite core 4. There is a possibility to adhere to. In this case, the electrical characteristics of the coil 5 may be changed, and a resonance signal having a desired frequency may not be obtained. Such a problem can also occur in the case of the electronic pen 1 shown in FIG.

  Therefore, as shown in FIG. 2, in the case of the electronic pen 1 </ b> A, a penetration preventing member 10 is provided in the end portion of the ferrite core 4 on the pen tip side in the housing 2. The permeation preventing member 10 is a cylindrical member made of a material that does not permeate moisture, such as synthetic resin or synthetic rubber, and has a slightly tapered shape. The position is fixed in the housing 2 by engaging with the inner wall of the body 2. Then, the tip of the ferrite core 4 on the pen tip side is fitted with the penetration preventing member 10, and the position on the pen tip side of the ferrite core 4 in the housing 2 is fixed.

  In the case of the electronic pen 1A shown in FIG. 2, the function of the penetration preventing member 10 prevents moisture such as saliva entering from the pen-side opening 2a from directly affecting the coil 5 constituting the resonance circuit. it can. Like the electronic pen 1 </ b> A shown in FIG. 2, by providing the penetration preventing member 10 in the housing 2, it is possible to configure an electronic pen that is resistant (waterproof) to intrusion of moisture from the outside.

  However, the core 3 of the electronic pen 1 (FIG. 1) or the electronic pen 1A (FIG. 2) of this embodiment does not slip on the plate-like resin or glass disposed on the sensor of the position detection device. In order to perform the input operation with a smooth writing taste, the one with elasticity is used. That is, the core 3 is provided with a gap or a pore from the tip of the nib 32 toward the rear end in the axial direction. There is also a slight gap 4 a between the core 3 and the ferrite core 4.

  For this reason, when the pen tip side of the electronic pen 1A is bitten, pinched, or licked by the user, the gaps or pores of the lead 3 or the gap between the lead 3 and the ferrite core 4 There is a possibility that saliva will permeate through. In this case, there is a concern that the electrical characteristics of the writing pressure detection unit 8 may be changed, or the electronic circuit of the subsequent circuit board 9 may be affected.

  Therefore, the electronic pen core 3 used in the electronic pens 1 and 1A of this embodiment has a configuration in which a bitter substance is immersed. That is, the core 3 for the electronic pen used in the electronic pen 1 or 1A of this embodiment is formed in a rod shape, and when the electronic pen 1 or 1A is attached, the pen tip 32 which is one end thereof is provided. Used to protrude from the opening of the tip of the electronic pen. The core 3 is provided with a void or a pore extending in a tubular shape in the axial direction from the tip of the pen tip 32. A bitter substance is soaked into the gap or pore extending in the tubular shape of the core 3 from the pen tip 32 side by capillary action.

  In this way, by impregnating the bitter substance, a waterproof treatment for closing the voids and pores can be performed. And if you bite, bark, or lick the pen tip side of the electronic pen 1, 1A, the bitter substance spreads in your mouth, so you feel bitterness, continue to bite, continue to bark, and continue to lick Can not be. As a result, saliva can be prevented from penetrating into the casing 2 of the electronic pen 1, 1 </ b> A through the gaps or pores of the core 3 or the gap between the core 3 and the ferrite core 4, and malfunction due to saliva penetration. And prevent malfunctions.

[Specific Configuration Example of Core 3]
FIG. 3 is a diagram for explaining a specific configuration example of the core 3. FIG. 3A shows the appearance of the core 3. The core 3 of the electronic pen 1, 1 </ b> A according to this embodiment is formed in a rod shape and includes a shaft portion 31 and a pen tip 32. As described above, the core 3 of this example is formed in a columnar shape, and the diameter of the pen tip 32 is slightly longer than the diameter of the shaft portion 31. And although the external appearance shape is substantially the same, the core 3 can be formed in the some aspect from which the internal structure differs.

  Specifically, there are a structure in which synthetic fibers are bundled, a structure in which pores are provided in a synthetic resin, a structure in which synthetic fibers are bundled and the side surfaces thereof are further wrapped with resin, and the like. Hereinafter, configuration examples of the cores 3A, 3B, and 3C having different internal configurations will be specifically described. FIGS. 3B, 3C, and 3D are diagrams for explaining configuration examples of the cores 3A, 3B, and 3C that are formed in the shape shown in FIG. 3A but have different internal configurations. FIG. 3A is a cross-sectional view of the cores 3A, 3B, and 3C when cut at the position indicated by the dotted line AA in FIG.

  FIG. 3B is an AA cross-sectional view of a core 3A configured by bundling synthetic fibers. The core 3 </ b> A is formed as a bundle of synthetic fibers, and is formed by bundling a plurality of synthetic fibers so as to generate a gap in the axial direction between the synthetic fibers. The core 3A in this example is formed using two types of synthetic fibers 3x and 3y. The synthetic fibers 3x and 3y are, for example, polyester fibers, nylon fibers, acrylic fibers, and the like. Note that a detailed configuration example is disclosed in, for example, Japanese Patent Application Laid-Open No. 2011-20443.

  And as shown in FIG. 3 (B), in the core 3A formed by bundling a plurality of synthetic fibers 3x and 3y, a portion surrounded by the synthetic fibers 3x and the synthetic fibers 3y becomes a gap GPa, Many such gaps GPa are formed. The synthetic fibers 3x and 3y have a length, and the gap formed in the portion surrounded by the synthetic fibers 3x and the synthetic fibers 3y is formed in a tubular shape (pipe shape) in the length direction. In the case of this example, a large number of gaps GPa provided in the core 3A penetrate from one end of the core 3A to the other end. In this way, the core 3A formed by bundling a plurality of synthetic fibers is more elastic because the nib 32 is easily deformed compared to a conventional core without a void formed integrally with, for example, a PET material. It becomes a thing with sex.

  FIG. 3C is an AA cross-sectional view of the core 3B configured by providing one or more pores inside the core formed of synthetic resin. The core 3B is made of, for example, plastic, and projections Tk1 to Tk8 having branch portions from the inner wall toward the center are provided inside the pipe-shaped core 3B. The protrusions Tk <b> 1 to Tk <b> 8 are provided in an elongated manner continuously from one end of the core 3 </ b> B to the other end. A portion where the protrusions Tk1 to Tk8 do not exist is a pore Pr. Since the protrusions Tk1 to Tk8 are continuously formed in the longitudinal direction, the pore Pr is also continuously present from one end of the core 3B to the other end.

  Then, as shown in FIG. 3C, the core PrB is provided with projections Tk1 to Tk8 having branch portions, so that the pore Pr is divided into a large number of portions. A state similar to that provided is formed. Thus, the inside of the core 3B is in a state in which a large number of pores (gap) are provided. For example, compared to a conventional core that is integrally formed of PET material and does not have pores, the pen tip 32 is provided. By being easily deformed, it becomes elastic.

  The term “pore” means an infinite number of pores (pores) existing in a so-called porous material. Even in the case of the core 3B of this embodiment, a plurality of holes are provided inside the core 3B. Since it is formed like a porous material, the hole provided in the core 3B is described as a pore. Further, the core 3B shown in FIG. 3C is an example, and the shape and number of protrusions and the like provided in the core 3B can be various. Detailed examples and formation methods thereof are disclosed in, for example, JP-A-2-6196 and JP-A-2003-25783.

  FIG. 3D is an AA cross-sectional view of the core 3C formed by bundling synthetic fibers to form the center part of the core and further wrapping the side surface of the center part with resin. The structure of the central part of the core formed by bundling synthetic fibers is the same as that described with reference to FIG. Then, the side surface of the central portion is wrapped with the resin 3Rn to constitute the core 3C. In this case, in addition to the gap GPa formed by being surrounded by the plurality of synthetic fibers 3x and 3y, a gap GPb surrounded by the synthetic fibers 3x and 3y and the resin 3Rn is also formed. By wrapping the side surface of the central part with resin, when the core 3C is mounted in the housing 2 of the electronic pen, the sliding movement in the axial direction according to the application and release of the writing pressure is smoother Can be done.

[Adhesion treatment of bitter substances]
And as demonstrated using FIG.3 (B), (C), (D), a bitterness substance is put into the said space | gap and pore of core 3A, 3B, 3C by which the space | gap and pore were provided in the axial direction, Soak in using capillary action. Capillary phenomenon is a phenomenon in which when a very thin tube is placed in a liquid, the liquid level in the tube becomes higher than the liquid level outside the tube. That is, the cores 3A, 3B, 3C of this embodiment are formed in a rod shape as shown in FIGS. 1, 2, and 3A. The gaps GPa, GPb, and pores Pr formed in the rod-shaped cores 3A, 3B, and 3C are all formed in a thin tubular shape in the axial direction of the cores 3A, 3B, and 3C. For this reason, by setting the cores 3A, 3B, and 3C in the aqueous solution in which the bitter substance is dissolved, the bitter substance can be infiltrated into the gaps GPa, GPb, and the pores Pr.

  FIG. 4 is a diagram for explaining a case where a bitter substance is infiltrated into the cores 3A, 3B, 3C. An aqueous solution 110 in which a bitter substance is dissolved in a container 100 is prepared. Here, Denatonium Benzoate is used as the bitter substance. For example, denatonium benzoate is used by being added to and applied to shampoos or SD cards to prevent accidental ingestion of infants and the like. Denatonium benzoate has a strong bitter taste, so if you put it in your mouth, you can immediately vomit it without swallowing it. It is especially effective for younger children.

  Then, as shown in FIG. 4A, the cores 3A, 3B, 3C are immersed in the aqueous solution 110 of the container 100 in the vertical direction from the pen tip 32 side. Accordingly, as shown in FIG. 4B, the nibs 32 of the cores 3A, 3B, and 3C are immersed in the aqueous solution 110 of the bitter substance. Thereby, the aqueous solution of a bitter substance penetrates into the tubular gaps GPa, GPb, and pores Pr extending in the axial direction of the cores 3A, 3B, and 3C by capillary action. Then, when the cores 3A, 3B, and 3C are pulled up from the aqueous solution 110 of the bitter substance after a predetermined time has elapsed, the bitter substance is contained in the tubular gaps GPa, GPb, and pores Pr extending in the axial direction of the cores 3A, 3B, and 3C. The aqueous solution stays.

  The aqueous solution of the bitter substance remaining in the tubular gaps GPa and GPb and the pores Pr extending in the axial direction of the cores 3A, 3B, and 3C evaporates with time, and the bitter substance is solidified and hardened. To do. Thereby, the tubular gaps GPa and GPb and the pores Pr extending in the axial direction of the cores 3A, 3B, and 3C are blocked by the bitter substance. That is, the tubular voids GPa and GPb and the pores Pr are closed by a bitter substance that is solidified and hardened, and is waterproofed.

  In addition, since solidified and hardened bitter substances are present inside the tubular gaps GPa, GPb, and pores Pr on the nib 32 side of the cores 3A, 3B, and 3C, If you lick or lick, the bitter substance will immediately spread in the mouth and you will feel a strong bitter taste. For this reason, it is impossible to continue the act of biting, barking, or licking the pen tip 32 side of the electronic pen 1, 1A with the cores 3A, 3B, 3C attached, and immediately release it from the mouth, Intrusion of saliva into the housing 2 can be effectively prevented.

  In addition, if the pen 3 side of the electronic pen 1 or 1A to which the cores 3A, 3B, and 3C are attached is bitten, frightened, or licked, it will be experienced that a strong bitterness is always felt. As a result, if you bite, bark, or lick, you will repeatedly feel bitterness, and the unconscious learning effect will bite, bark, and lick the pen tip side of the electronic pen 1, 1A. It can be corrected so that it does not move.

[Effect of the embodiment]
Bitter substances are soaked in the voids and pores formed inside the pen for electronic pens, the moisture is evaporated, solidified and cured, so that the voids and pores are closed with the bitter substances and waterproofed. Can be applied.

  Further, if the nib side of the lead is bitten, squeezed or licked, a bitter substance spreads in the oral cavity, so that a strong bitter taste is felt. As a result, it is impossible to continue the movement of the heel such as biting, barking, or licking the pen nib side of the lead, preventing the saliva from penetrating into the case of the electronic pen, malfunctioning or malfunctioning Can be prevented.

  Therefore, a suitable electronic pen can be realized when used by young children such as kindergarten children and elementary school children who often have a habit of biting, barking, and licking the pen.

[Modification]
<Other examples of core external shape>
FIG. 5 is a diagram for explaining another example of the external shape of the core 3. In the above-described embodiment, the core 3 is formed in a columnar shape as shown in FIG. 3A, and includes the shaft portion 31 and the pen tip 32 having a diameter longer than the shaft center portion. Although explained, it is not limited to this. For example, various external shapes as shown in FIG.

  The core 3D shown in FIG. 5A is formed in a columnar shape and has the same diameter in any part, but the tip on the pen tip side is rounded like a dome. The core 3E shown in FIG. 5 (B) is formed in a columnar shape, and the tip on the pen tip side is tapered. Further, the core 3E shown in FIG. 5C is simply formed in a cylindrical shape. In addition, the other example of the external appearance shape of the core 3 shown in FIG. 5 is an example to the last, and it can also be set as the other external appearance shape.

  For example, the core 3 may be formed in a polygonal prism shape that is not less than a cylinder and a triangular prism shape or more. That is, the core 3 may be any shape as long as the cross section in the direction intersecting the axial direction is formed in a rod shape (columnar shape) and has a tubular void or pore inside.

<Other examples of core internal structure>
In the above-described embodiment, as described with reference to FIGS. 3B, 3 </ b> C, and 3 </ b> D, the gaps GPa, GPb, and the pore Pr penetrate from one end of the core to the other end. However, the present invention is not limited to this. The gaps GPa and GPb and the pores Pr should be formed on the pen tip side and have an appropriate length in the axial direction that can hold the bitter substance.

  When the core is formed by bundling synthetic fibers, a synthetic fiber itself formed into a tubular shape may be used. By using a tubular synthetic fiber, a bitter substance can be infiltrated not only into the voids generated between the synthetic fibers but also into the tubular synthetic fiber, and more bitter substance can be retained.

<Active electrostatic coupling type electronic pen>
Further, as described above, the electronic pen core of the present invention can also be applied to an electronic pen corresponding to an active electrostatic coupling (AES (Active Electrostatic)) position detection device. The active electrostatic coupling type electronic pen transmits a signal from an oscillation circuit mounted on the electronic pen to a position detection device to give a position instruction and a writing pressure notification. Therefore, as in the above-described electromagnetic induction type electronic pen, the position detection device does not exchange signals with the position detection device through the resonance circuit, but sends position indication and writing pressure notification signals from the core. Need to be sent to.

  Therefore, the core used in the active electrostatic coupling type electronic pen needs to have conductivity. Specifically, when forming a synthetic fiber or a synthetic resin for forming a core, various conductive materials may be mixed. Examples of the conductive material include metal materials such as copper and aluminum, and semiconductors such as graphite and silicon carbide. In recent years, conductive plastics and the like have been developed. Using such conductive plastics, for example, as described with reference to FIG. A core for an active electrostatic coupling type electronic pen provided with the above can also be configured.

<Others>
As described above, polyester fiber, nylon fiber, acrylic fiber, or the like can be used as the synthetic fiber. Similarly, for synthetic resins, various substances made of artificially produced polymer compounds can be used.

  In addition, the bitter substances used are not limited to denatonium benzoate, and various bitter substances such as plant-derived bitter substances extracted from plant leaves or fruit epidermis are used. Can do.

DESCRIPTION OF SYMBOLS 1, 1A ... Electronic pen, 2 ... Housing | casing 3, 3A, 3B, 3C ... Core, 3D, 3E, 3F ... Core, 4 ... Ferrite core, 5 ... Coil, 6 ... 1st holding member, 7 ... 2nd Holding member, 8 ... writing pressure detection unit, 81 ... core body holding unit, 82 ... pressing unit, 83 ... first electrode, 84 ... spring, 85 ... dielectric, 86 ... second electrode, 9 ... circuit board, 10 ... Penetration preventing member, 3x, 3y ... synthetic fiber, GPa, GPb ... void, Tk1-Tk8 ... projection, Pr ... pore, 3Rn ... resin, 100 ... container, 110 ... aqueous solution of bitter substance

Claims (6)

A rod-shaped core for an electronic pen,
When attached to the electronic pen, one end protrudes from the opening of the tip of the electronic pen,
A pore or void is provided in the axial direction from the one end,
A core for an electronic pen, wherein a bitter substance is immersed in at least one end side by capillary action. Composed as a bundle of synthetic fibers,
2. The electronic pen core according to claim 1, wherein the gap in the axial direction is generated between the synthetic fibers by bundling a plurality of the synthetic fibers. Composed of synthetic resin,
The core for an electronic pen according to claim 1, wherein one or more pores are provided in an axial direction.   A central portion is formed by bundling a plurality of synthetic fibers to form the gap in the axial direction between the synthetic fibers, and a longitudinal side surface of the central portion is wrapped with a resin. The lead for electronic pens according to claim 1.   5. The electronic pen core according to claim 1, wherein the electronic pen core has conductivity by being attached with a conductive substance. The core for an electronic pen according to any one of claims 1 to 5, wherein the bitter substance is denatonium benzoate.

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