KR-102963857-B1 - electronic pen

KR102963857B1KR 102963857 B1KR102963857 B1KR 102963857B1KR-102963857-B1

Abstract

Further miniaturization of the electronic pen is achieved without degrading the functionality of the electronic pen. The columnar ferrite core (212) has a through hole (212a) and is composed of three parts: a front part (212F), a middle part (212M), and a rear part (212B). The outer diameter of the middle part (212M) is shorter than the outer diameters of the front part (212F) and the rear part (212B), so the middle part (212M) has a tapered shape, similar to a so-called dumbbell, which is a piece of gymnastic equipment. Since an insulated wire is wound around the middle part (212M) to form a coil (211), the part of the ferrite core (212) where the coil (211) is wound does not become thick, which can contribute to miniaturization of the electronic pen.

Inventors

마츠모토 요시하루

Assignees

가부시키가이샤 와코무

Dates

Publication Date: 20260513
Application Date: 20211005
Priority Date: 20201228

Claims (11)

coil and, A columnar magnetic core having a coil wound thereon and an axial through hole, and A capacitor that forms a resonant circuit together with the above coil, and An electronic pen having a rod-shaped core that penetrates the through hole of the magnetic core and transmitting and receiving signals by electromagnetic induction with a position detection sensor, The magnetic core comprises a front portion extending in a predetermined range from the leading end of the pen tip side to the rear end opposite to the pen tip side, a rear portion extending in a predetermined range from the rear end to the leading end side, and an intermediate portion fitted between the front portion and the rear portion. The outer diameter of the above middle part is shorter than the outer diameters of the above front part and the above rear part, and An electronic pen characterized by the coil being wound around the middle portion.
In claim 1, The middle portion of the magnetic core is a wound portion where the coil is wound, and the front portion and the rear portion are non-wound portions where the coil is not wound. An electronic pen characterized in that the outer diameter of the wound portion in the state where the coil is wound is less than or equal to the outer diameter of the unwound portion.
In claim 1, An electronic pen characterized in that the pen tip side of the front portion of the magnetic core has a tapered section formed therein that gradually tapers toward the tip.
In claim 1, An electronic pen characterized by having a groove along the axial direction provided on the side of the rear portion of the magnetic core to extend an insulating wire from the coil wound in the middle portion of the magnetic core toward the rear end.
In claim 1, A reinforcing pipe is provided that is fixed from one end to the other end of the through hole of the magnetic core and has a leading end protruding from the leading end opening of the magnetic core. An electronic pen characterized in that the above-described core is capable of sliding axially within the reinforcing pipe.
In claim 1, An electronic pen characterized by at least a portion of the front part of the magnetic core and the pen tip portion of the core being used in a state protruding from the electronic pen housing.
In claim 1, A reinforcing pipe is provided that is fixed from one end to the other end of the through hole of the magnetic core and has a leading end that protrudes beyond the front portion of the magnetic core. An electronic pen characterized in that at least a portion of the front part of the magnetic core, the tip of the reinforcing pipe, and the pen tip of the core are used in a state protruding from the electronic pen housing.
In claim 1, An electronic pen characterized in that the axial length of the middle portion of the magnetic core is equal to the sum of the axial lengths of the front portion and the rear portion of the magnetic core.
In claim 1, The axial length of the middle portion of the magnetic core is equal to the sum of the axial lengths of the front portion and the rear portion of the magnetic core, and An electronic pen characterized in that the length in the axial direction of the front portion is slightly longer than the length in the axial direction of the rear portion.
In claim 1, An electronic pen characterized in that the outer diameter of the front portion and the rear portion of the magnetic core is 2.3 mm.
A coil connected to the charging circuit of a battery that supplies driving power, and A columnar magnetic core having a through hole in the axial direction and the above coil wound thereon, and A rod-shaped core that passes through the through hole of the magnetic core, and A capacitive electronic pen equipped with an oscillation circuit that generates a signal transmitted through the above-mentioned core, The magnetic core comprises a front portion extending in a predetermined range from the front end, which becomes the pen tip, to the rear end, which is opposite to the pen tip side, a rear portion extending in a predetermined range from the rear end to the front end side, and an intermediate portion fitted into the front portion and the rear portion. The outer diameter of the above middle part is shorter than the outer diameters of the above front part and the above rear part, and An electronic pen characterized by the coil being wound around the middle portion.

Description

electronic pen The present invention relates to an electronic pen, which is a pen-type position indicator used in conjunction with a position detection device. An electronic pen is held by a user and used to indicate a position on a sensor of a position detection device. Since the electronic pen is constructed by incorporating circuit boards, it is thicker than ordinary writing instruments such as ballpoint pens or fountain pens. However, with the miniaturization and thinning of electronic devices such as so-called tablet PCs (Personal Computers) and high-performance mobile phone terminals called smartphones that are equipped with position detection devices, it has been required that the electronic pen also be made thinner. Accordingly, Patent Document 1 described below discloses an invention relating to an electronic pen body part, etc., which is formed with a size similar to that of a ballpoint pen refill (replacement tip) and can be mounted in an existing ballpoint pen housing for use. Additionally, Patent Document 2 described below discloses an invention relating to an electronic pen, etc., which has increased strength so that the pen tip part, which is susceptible to external pressure, does not bend or break even when made slender. FIG. 1 is a figure for explaining an electronic pen of an embodiment and a tablet terminal in which the electronic pen is used. FIG. 2 is a drawing for explaining an example of the configuration of the main part of an electronic pen of an embodiment. FIG. 3 is a drawing for explaining the configuration of the ferrite core portion of an electronic pen of an embodiment. FIG. 4 is a diagram illustrating the magnetic flux distribution of the ferrite core portion of an electronic pen according to the present invention and the magnetic flux distribution of the ferrite core portion of a conventional electronic pen. FIG. 5 is a drawing for explaining the groove portion provided in the ferrite core of the electronic pen according to the present invention. FIG. 6 is a drawing for explaining an example of configuration in which the electronic pen according to the present invention is applied to an active capacitive electronic pen. Hereinafter, an embodiment of an electronic pen according to the present invention will be described with reference to the drawings. Furthermore, the position detection method of the electronic pen and the position detection sensor may include, for example, an electromagnetic induction method or a capacitance method. In the electromagnetic induction method (EMR (Electro Magnetic Resonance) method), the position detection device is equipped with a sensor unit having a plurality of loop coils arranged in the X-axis direction and the Y-axis direction, respectively. A transmitting period is alternately provided for generating a magnetic field by sequentially supplying power to the plurality of loop coils of the sensor unit, and a receiving period is provided for stopping the power supply and receiving a magnetic field from the outside. The corresponding electronic pen is equipped with a resonant circuit consisting of a coil and a capacitor, and generates a signal by flowing current through the corresponding coil according to the magnetic field from the sensor unit, and transmits this signal, including pressure information, to the position detection sensor. The position detection device receives this during the receiving period and detects the indicated position and pressure by the electronic pen. In the capacitive method, a position detection device is equipped with a sensor unit that has multiple linear conductors (line electrodes) arranged in the X-axis and Y-axis directions, respectively. This sensor unit detects the indicated position based on changes in capacitance (electric charge) generated in the linear conductors when a finger or an electrostatic pen approaches. Additionally, electrostatic pens include a pen-type position indicator that possesses conductivity and a so-called active electrostatic pen (AES (Active Electrostatic) method) that is battery-driven and transmits signals. In the case of the active electrostatic coupling method using an active electrostatic pen, the electronic pen transmits a signal from an oscillation circuit mounted on the pen, including pressure information, and receives this signal to detect the indicated position and pressure. In the case of an active electrostatic pen, it is not fundamentally necessary to equip it with a coil. However, when charging an installed battery via contactless charging, a coil may be equipped for charging purposes. This invention is applicable to electronic pens that require the inclusion of a coil. Therefore, the electronic pen of this invention is applicable to both electronic pens using the electromagnetic induction method and to electronic pens using the active electrostatic coupling method (active electrostatic pen) that perform contactless charging. Furthermore, in the embodiments described be