JP2019171584A - Magnetic pen - Google Patents

Abstract

To provide a magnetic pen incorporating an eraser having a method that changes magnetic lines.SOLUTION: The magnetic pen comprises a shaft body 1 held by a user, a writing magnet 2 disposed at one end of the shaft body 1, an erasing magnet disposed rotatably inside the shaft body 1, a motor disposed inside the shaft body 1 for rotating the erasing magnet, and a power source disposed inside the shaft body 1 for supplying a current to the motor. The power source is disposed at a writing magnet side compared to the erasing magnet and the motor.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a magnetic pen for writing characters on a display surface of a magnetic display panel including a microcapsule magnetophoretic display sheet.

  2. Description of the Related Art Conventionally, a magnetic pen that writes characters on a display surface of a magnetic display panel including a microcapsule magnetophoretic display sheet and an eraser that erases characters are known. For example, Patent Document 1 discloses a magnetic pen having an eraser function. Magnets for writing characters are provided at both ends of the shaft of the magnetic pen. An erasing magnet that performs an eraser function for erasing characters is provided on the side surface of the magnetic pen.

  For example, Patent Document 2 discloses an eraser that can erase characters written on the display surface of a magnetic display panel from the display surface side. This eraser includes a motor and a magnet inside the casing, and can change the magnetic field lines by rotating the magnet so that the black magnetic particles in the microcapsules of the magnetic display panel can be largely migrated.

JP 2011-051099 A Japanese Patent No. 6212386

  In order to cleanly erase characters written on the display surface of the magnetic display panel, it is preferable to use a method in which the lines of magnetic force are changed as in the eraser of Patent Document 2, compared to the eraser function of Patent Document 1. However, when a motor and a power source are incorporated in a magnetic pen in order to change the lines of magnetic force, there is a problem that the weight increases and it is difficult for the user to write.

  An object of the present invention is to provide a magnetic pen that incorporates an eraser that changes the magnetic field lines and is easy for a user to write.

  In order to achieve the above object, a magnetic pen according to the invention described in claim 1 includes a shaft body that is gripped by a user, a writing magnet disposed at one end of the shaft body, and the shaft body. An erasing magnet rotatably disposed within the shaft, a motor disposed within the shaft to rotate the erasing magnet, and a current to the motor for supplying current to the motor. A power source disposed inside, and the power source is disposed closer to the writing magnet than the erasing magnet and the motor.

  The magnetic pen which concerns on invention of Claim 2 arrange | positions the shield member which covers a part of outer periphery of the said erasing magnet inside the said shaft body.

  The magnetic pen which concerns on invention of Claim 3 WHEREIN: It arrange | positions in the inside of the said shaft body in order of the said power supply, the said motor, and the said erasing magnet from the said writing magnet side.

  According to the present invention, the shaft body is gripped by the user. The writing magnet is disposed at one end of the shaft body. The erasing magnet is rotatably disposed inside the shaft body. A motor is disposed inside the shaft for rotating the erasing magnet. A power source is disposed inside the shaft for supplying current to the motor. The power source is arranged on the writing magnet side as compared with the erasing magnet and the motor. As a result, even if the motor and power supply are incorporated into the magnetic pen to change the magnetic field lines, the center of gravity is located below the magnetic pen when the user holds the magnetic pen in his hand, making it easier for the user to write. Become.

1 is an overall shape diagram of a magnetic pen according to an embodiment of the present invention. It is AA sectional drawing of FIG. 1 of the magnetic pen which concerns on this embodiment. It is BB sectional drawing of FIG. 1 of the magnetic pen which concerns on this embodiment. It is a figure which shows the usage condition of the magnetic pen which concerns on this embodiment.

[Embodiment]
A magnetic pen according to an embodiment of the present invention will be described with reference to the drawings. To describe the magnetic pen, the upward direction of the arrow Y shown in FIG. 1 is expressed as “up” and the downward direction as “down”, the left direction of the arrow X as “left”, and the right direction as “right”. I will explain.

  As shown in FIG. 1, the magnetic pen includes a shaft body 1, a writing magnet 2, a switch 3, and a cap 4. The shaft body 1 is a portion held by a hand when a user writes a character or the like, and the writing magnet 2 is a portion that abuts on the display surface of the magnetic display panel. The switch 3 is a push button. When the user continues to push the push button, a switch of a plus electrode 13 described later is turned on. Further, when the user stops pressing the push button, the switch of the plus electrode 13 described later is turned off. The cap 4 is a member for preventing a member described later disposed inside the shaft body 1 from coming out of the shaft body 1.

  FIG. 2 is a cross-sectional view taken along the line AA in FIG. 1, and the magnetic pen will be described in detail with reference to FIG.

  The magnetic pen includes a shaft body 1, a power source 11, a negative electrode 12, a positive electrode 13, a wiring 14, a motor 15, a magnet case 16, a first erasing magnet 161, and a second erasing magnet 162. A third erasing magnet 163, a fourth erasing magnet 164, a shield member 17, a rotating shaft 18, a writing magnet 2, a protective spring 21, a switch 3, and a cap 4.

  The shaft body 1 is formed of a material that is a nonmagnetic material such as plastic, and has a cylindrical shape in which a gap is formed from the left end to the right end. A through hole is formed from the outer surface to the inner surface of the shaft body at a position where the switch 3 is disposed. The vicinity of the left end portion of the shaft body 1 is formed so that the length of the outer diameter of the shaft body gradually becomes smaller toward the left end portion.

  The power source 11 is a dry cell or a battery, and is disposed inside the shaft body 1 at a left position.

  The negative electrode 12 includes a spring constituting the electrode and a pedestal for installing the spring. The negative electrode 12 is disposed in the shaft body 1 at a position adjacent to the left side of the power source 11, and is disposed so that one of the springs contacts the negative electrode of the power source 11. The other side of the spring is connected to the minus-side wiring of the wiring 14 described later. The negative electrode 12 is fixed to the shaft body 1 with the pedestal engaged inside the shaft body 1.

  The plus electrode 13 includes a terminal constituting the electrode, a switch board, and a pedestal for installing the terminal. The plus electrode 13 is arranged in the shaft body 1 at a position adjacent to the right side of the power supply 11, and is arranged so that one of the terminals contacts the plus electrode of the power supply 11. The other terminal is connected to one of the switch boards. The switch board makes the current of the power source 11 inputted from the terminal into a conductive state when the switch 3 is pressed, and turns off when the switch 3 is stopped. The other side of the switch board is connected to a plus-side wire among wires 14 described later. The plus electrode 13 is fixed to the shaft body 1 with the pedestal engaged inside the shaft body 1.

  The wiring 14 is inside the shaft body 1 in order to electrically connect the negative electrode 12 and the positive electrode 13 and an electrode of a motor 15 to be described later, at a position between the positive electrode 13 and the motor 15. Be placed. The wiring 14 includes two copper wires for electrically connecting the plus-side electrodes and the minus-side electrodes, and a coating for insulation around the copper wires.

  The motor 15 is disposed inside the shaft body 1 and at a position adjacent to the right of the wiring 14. The motor 15 includes a rotor that rotates around the axis of the shaft body 1, a shaft connected to the rotor, a magnet disposed so as to surround the outer periphery of the rotor, and an electrode. The motor 15 is a motor generally called a DC motor, but is not limited thereto.

  The magnet case 16 is disposed inside the shaft body 1 and at a position adjacent to the right of the motor 15. The magnet case 16 is made of a material that is a non-magnetic material such as plastic, and has a plurality of gaps for arranging the erasing magnet from the left end to the right end. The shape of the gap is the same as that of the erasing magnet. A concave portion is formed in the end surface of the left end portion of the magnet case 16, and a part of the end portion of the shaft of the motor 15 is press-fitted into the concave portion. Thereby, the rotation of the motor 15 is transmitted to the magnet case 16, and the magnet case 16 rotates at the same rotational speed as the motor 15. Further, a concave portion is formed in the end surface of the right end portion of the magnet case 16, and a shaft member of the rotating shaft 18 described later is press-fitted into the concave portion.

  The first erasing magnet 161, the second erasing magnet 162, the third erasing magnet 163, and the fourth erasing magnet 164 are magnets having a cylindrical shape. Each of the first erasing magnet 161, the second erasing magnet 162, the third erasing magnet 163, and the fourth erasing magnet 164 is one of the cross sections like the third erasing magnet 163 shown in FIG. Are magnetized so that the semicircle is an N pole and the other semicircle is an S pole.

  The shield member 17 is disposed inside the shaft body 1 and covers the outer periphery of the magnet case 16 so as to cover a part of the magnet case 16. The shield member 17 is formed of a material having high magnetic permeability such as iron, yoke, ferrite core or the like. Thereby, among the magnetic force lines generated from the magnet case 16 toward the outer peripheral direction, the magnetic force lines are blocked in the portion covered with the shield member 17. Specifically, referring to FIG. 3, the shield member 17 is provided in a range of 240 degrees with respect to the central axis of the magnet case 16 with a certain interval. As a result, an angle of 120 degrees formed by the central axis that is not covered by the shield member 17 is opened, and lines of magnetic force are generated outside only in the opened region.

  The rotating shaft 18 is disposed inside the shaft body 1 and at a position adjacent to the right of the magnet case 16. The rotating shaft 18 includes a rotatable shaft member and a pedestal on which the shaft member is rotatably attached. The shaft member is made of a material such as a metal such as stainless steel. The pedestal is formed from a material that is a non-magnetic material such as plastic. The rotating shaft 18 is fixed to the shaft body 1 with a pedestal engaged inside the shaft body 1.

  The writing magnet 2 is a magnet having a cylindrical shape. A yoke is provided around the writing magnet 2.

  The protective spring 21 is made of a material such as metal. The protective spring 21 is disposed between the writing magnet 2 and the negative electrode 12. The protective spring 21 is a member for expanding and contracting according to the writing pressure so as not to damage the surface of the magnetic display panel when the user's writing pressure is high.

  The switch 3 includes a button, a core fixed to the button, and a spring. The button and the core are formed of a nonmagnetic material such as plastic. The spring is made of a material such as metal. The core is disposed in the through hole of the shaft body 1, and the tip end surface of the core forms a part of the switch board. The spring is disposed at a step portion of the through hole of the shaft body 1. Due to the presence of the spring, a force is exerted to push the button upward, and the switch board remains non-conductive unless the user pushes the switch button downward.

  The cap 4 is formed of a material that is a nonmagnetic material such as plastic, and is disposed so as to cover the gap at the right end of the shaft body 1.

<Operation of this embodiment>
Next, the operation of this embodiment will be described with reference to FIG. When the user presses the button of the switch 3 with a finger, the switch board of the plus electrode 13 becomes conductive. As a result, the current from the power supply 11 is supplied to the motor 15 and the motor 15 rotates. As the motor 15 rotates, the magnet case 16 also rotates. Due to the rotation of the first erasing magnet 161, the second erasing magnet 162, the third erasing magnet 163, and the fourth erasing magnet 164, the magnetic field lines generated from the portion not covered by the shield member 17 are N poles. , S pole and N pole are alternately switched.

  When the user stops pressing the button of the switch 3, the switch substrate of the plus electrode 13 becomes non-conductive, and the current supplied to the motor 15 is cut off.

<Usage of this embodiment>
Next, a usage pattern of this embodiment will be described with reference to FIG. This usage pattern is a usage pattern when erasing characters written on the display surface of the magnetic display panel.

  When the user wants to erase the characters written on the display surface of the magnetic display panel, the part not covered with the shield member 17 is kept on the display surface side with the button of the switch 3 kept pressed with a finger. Is slid vertically with respect to the display surface. As a result, the characters written on the display surface of the magnetic display panel facing the magnetic pen can be erased.

  When the user wants to stop erasing characters written on the magnetic display panel, the user stops pressing the button of the switch 3 and stops sliding the magnetic pen with respect to the display surface of the magnetic display panel.

<Effect of this embodiment>
According to the present embodiment, the power supply 11 that is heaviest than the motor 15 and the magnet case 16 in the shaft 1 is disposed on the side of the writing magnet 2. Thereby, when the user grasps the shaft 1, the center of gravity of the magnetic pen becomes the writing magnet 2 side, and the center of gravity becomes low, and writing becomes easy.

  According to the present embodiment, the power source 11, the motor 15, and the magnet case 16 are arranged in this order from the writing magnet 2 side in the shaft body 1. As a result, the wiring 14 between the power source 11 and the motor 15 can be shortened, so that the material cost can be reduced.

  Although the embodiments of the present invention have been described above, various modifications can be made by those skilled in the art without departing from the spirit of the present invention.

(Modification 1)
In the present embodiment, the writing magnet 2 is a cylindrical magnet. A yoke is provided around the writing magnet 2. Instead of this embodiment, a non-magnetic holder may be provided around the writing magnet 2 to prevent breakage of the magnet.

  In the present embodiment, the first erasing magnet 161, the second erasing magnet 162, the third erasing magnet 163, and the fourth erasing magnet 164 are columnar magnets. Instead of this embodiment, a regular polygonal column shape such as a triangular column or a quadrangular column, or a spherical shape may be used.

  In the present embodiment, the magnet is magnetized so that one semicircle of the cross section of the magnet is an N pole and the other semicircle is an S pole. Instead of this embodiment, a pair of fan shapes arranged on a diagonal line among the fan shapes each having a cross section divided into four may be magnetized as N poles, and the other pair of fan shapes may be magnetized as S poles.

  DESCRIPTION OF SYMBOLS 1 ... Shaft body, 11 ... Power supply, 12, Negative electrode, 13, Positive electrode, 14 ... Wiring, 15 ... Motor, 16 ... Magnet case, 161 ... For 1st erasing Magnets 162 ... second erasing magnets 163 ... third erasing magnets 164 ... fourth erasing magnets 17 ... shielding members 18 ... rotating shafts 2 ... Writing magnet, 21 ... Protective spring, 3 ... Switch, 4 ... Cap

Claims (3)

A shaft gripped by the user;
A writing magnet arranged at one end of the shaft;
An erasing magnet disposed rotatably inside the shaft,
A motor disposed inside the shaft for rotating the erasing magnet;
A power source disposed inside the shaft for supplying a current to the motor, wherein the power source is disposed closer to the writing magnet than the erasing magnet and the motor. Characteristic magnetic pen   The magnetic pen according to claim 1, wherein a shield member that covers a part of the outer periphery of the erasing magnet is disposed inside the shaft body.   3. The magnetic pen according to claim 2, wherein the power source, the motor, and the erasing magnet are arranged in this shaft body in order from the writing magnet side.

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