JP2016063331A - Resonator, electronic pen, and method of manufacturing resonator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact resonator.SOLUTION: A resonator 1 according to the present invention includes: a capacitor 10 arranged so as to extend in a first direction; a magnetic body 11 arranged around the capacitor 10 with the first direction as a central axis 19; and a coil 13 arranged around the magnetic body 11 with the first direction as a central axis and electrically connected to the capacitor 10. That is, the magnetic body 11 is provided with a hollow part 17, and the capacitor 10 is arranged in the hollow part 17 of the magnetic body 11.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a resonator, an electronic pen, and a method for manufacturing the resonator.

  One of input devices used for portable devices such as tablet terminals is an electronic pen. For example, when detecting the coordinate position indicated by the electronic pen, an electromagnetic wave signal is transmitted and received between the loop coil and the electronic pen arranged so as to be orthogonal, and the coordinate position indicated by the electronic pen is specified. Yes (electromagnetic induction method).

  Patent Document 1 discloses a technique related to a position indicator (electronic pen). In the position indicator disclosed in Patent Document 1, a tuning circuit (resonator) is arranged inside a pen-shaped housing. The tuning circuit includes a hollow cylindrical ferrite, a coil wound around the outer periphery of the ferrite, and a capacitor connected in parallel with the coil.

JP-A-8-69350

  In recent years, in order to improve the portability and convenience of the electronic pen, it is required to make the electronic pen thinner. In order to make the electronic pen thinner, it is necessary to reduce the size of the resonator built in the electronic pen. The resonator is configured by using a coil and a capacitor. However, in order to satisfy the characteristics as the resonator, it is necessary to wind a certain winding, and the coil becomes long. On the other hand, when the coil becomes long, the volume of the coil increases, and the space for arranging the capacitor becomes narrow, resulting in a problem that the resonator becomes large.

  In view of the above problems, an object of the present invention is to provide a compact resonator, an electronic pen, and a method for manufacturing the resonator.

  A resonator according to the present invention includes a capacitor disposed to extend in a first direction, a magnetic body disposed around the capacitor with the first direction as a central axis, and the first direction as a center. A coil disposed as an axis around the magnetic body and electrically connected to the capacitor.

  An electronic pen according to the present invention includes a pen-shaped housing and the resonator disposed inside the housing.

  The method for manufacturing a resonator according to the present invention includes bonding a capacitor to a longitudinal end of a sheet-like magnetic body using a double-sided tape, winding the sheet-like magnetic body to which the capacitor is bonded, The sheet-like magnetic body is disposed around the capacitor so as to be in close contact with the capacitor, and a coil electrically connected to the capacitor is disposed around the magnetic body.

  According to the present invention, it is possible to provide a compact resonator, an electronic pen, and a method for manufacturing the resonator.

1 is a side view showing a resonator according to a first embodiment. FIG. 2 is a cross-sectional view of the resonator shown in FIG. 1 taken along section line II-II. It is sectional drawing which cut | disconnected the resonator shown in FIG. 1 by the surface containing a central axis. FIG. 6 is a cross-sectional view illustrating another configuration example of the resonator according to the first embodiment. FIG. 6 is a cross-sectional view illustrating another configuration example of the resonator according to the first embodiment. FIG. 6 is a cross-sectional view illustrating another configuration example of the resonator according to the first embodiment. FIG. 6 is a side view showing a resonator according to the second embodiment. FIG. 8 is a cross-sectional view taken along section line VIII-VIII of the resonator shown in FIG. 7. It is sectional drawing which cut | disconnected the resonator shown in FIG. 7 by the surface containing a central axis. 10 is a perspective view for explaining a manufacturing process for the resonator according to the second embodiment; FIG. 10 is a perspective view for explaining a manufacturing process for the resonator according to the second embodiment; FIG. FIG. 12 is a perspective view for explaining another example of the manufacturing process of the resonator according to the second embodiment. FIG. 12 is a perspective view for explaining another example of the manufacturing process of the resonator according to the second embodiment. It is sectional drawing which shows the resonator manufactured using the manufacturing process shown in FIG. 12, FIG. FIG. 10 is a perspective view illustrating another configuration example of the capacitor included in the resonator according to the second embodiment. FIG. 10 is a perspective view illustrating another configuration example of the capacitor included in the resonator according to the second embodiment.

<Embodiment 1>
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a side view showing a resonator 1 according to the present embodiment. 2 is a cross-sectional view taken along section line II-II of resonator 1 shown in FIG. FIG. 3 is a cross-sectional view of the resonator 1 shown in FIG. 1 cut along a plane including the central axis 19. As shown in FIGS. 1 to 3, the resonator 1 according to the present embodiment includes a capacitor 10, a magnetic body 11, an insulator 12, and a coil 13.

  The capacitor 10 is arranged to extend in a direction (first direction) parallel to the shaft 19. The capacitor 10 can be configured by connecting a plurality of capacitor elements in parallel with each other. 2 and 3 show the case where the capacitor 10 is configured by arranging four capacitor elements in two rows. For example, as shown in FIGS. 4 and 5, there are six capacitors. The capacitor 10 'may be configured by arranging the elements in a line. Thus, by arranging a plurality of capacitors in a line and connecting them in parallel, the capacitance C can be increased while keeping the resonator 1 thin. Therefore, for example, even when the inductance L is insufficient in setting the resonance frequency f = 1 / (2π√LC) necessary for the resonator 1, this is compensated by the large capacitance C, and the necessary resonance frequency f is set. Can be set.

  The magnetic body 11 is disposed around the capacitor 10 with the shaft 19 as a central axis. As shown in FIGS. 2 and 3, the magnetic body 11 includes a hollow portion 17 (that is, has a hollow shape), and the capacitor 10 is disposed in the hollow portion 17 of the magnetic body 11. For example, the magnetic body 11 may be configured by winding a deformable flexible sheet-like magnetic body around the shaft 19 as a central axis. As the sheet-like magnetic body, for example, an electromagnetic interference suppressing body may be used. For example, Busta Raid (registered trademark) can be used as the sheet-like magnetic body. Such a sheet-like magnetic body can be formed, for example, by crushing magnetic powder and spreading the crushed magnetic powder on a resin material or the like.

  It is desirable that the thickness of Busterade (registered trademark) used here is 0.2 mm or less. Since it is required to make the electronic pen thinner, the outer diameter of the magnetic body needs to be reduced to about several millimeters. However, if the magnetic sheet is too thick, it is difficult to wind it thin. It is desirable that the number of windings of Basterade (registered trademark) is 2 times or more and 6 times or less. If the thickness of the magnetic material is thin, the resonance frequency changes according to the external voltage or the Q value of the coil decreases. Therefore, the thickness of the magnetic material is ensured by winding a plurality of times. Furthermore, in order to ensure the thickness of the magnetic material, it is desirable that the thickness of the Vasterade (registered trademark) is 25 μm or more so that the number of windings of the magnetic sheet is not excessive.

  The insulator 12 is disposed between the magnetic body 11 and the coil 13. The insulator 12 is provided to maintain electrical insulation between the magnetic body 11 and the coil 13. The insulator 12 can be configured using an insulating material such as rubber or resin. Note that the insulator 12 may be omitted as long as electrical insulation between the magnetic body 11 and the coil 13 can be maintained.

  The coil 13 is disposed around the insulator 12. When the insulator 12 is not provided, the coil 13 is disposed around the magnetic body 11. The coil 13 is electrically connected to the capacitor 10 using wirings 15_1 and 15_2. Specifically, one end of the capacitor 10 connected in parallel to each other is connected to one end of the coil 13 using a wiring 15_1, and the other end is connected to the other end of the coil 13 using a wiring 15_2. At this time, as shown in FIG. 3, the capacitor 10 and the coil 13 may be electrically connected using wirings 15_1 and 15_2 at one of the longitudinal ends of the capacitor 10. Further, like the resonator 1 ′ shown in FIG. 5, the capacitor 10 ′ and the coil 13 are electrically connected to each other at both ends of the longitudinal ends of the capacitor 10 ′ using wirings 15_1 and 15_2. May be.

  For example, the coil 13 may be a stranded wire coil formed by twisting a plurality of coils. Thus, the Q value of a coil can be made high by using a stranded wire coil. For example, when designing a resonator of 500 kHz, it is desirable to use a strand having a wire diameter of 0.2 mm or less, considering that the skin depth of 500 kHz is about 0.1 mm.

  In the resonator 1 described above, the case where the cross sections of the magnetic body 11, the insulator 12, and the coil 13 are substantially circular (see FIGS. 2 and 4) has been described. However, in the resonator according to the present embodiment, the cross-sectional shapes of the magnetic body 11, the insulator 12, and the coil 13 may be other shapes. For example, when the outer peripheral shape in the cross section of the capacitor 10 is substantially rectangular (rectangular) as in the resonator 1 ″ shown in FIG. 6, the inner peripheral shape of the magnetic body 11 is substantially rectangular (that is, the capacitor 10 The shape may be a shape corresponding to the outer peripheral shape. In this case, the cross-sectional shapes of the insulator 12 and the coil 13 disposed around the magnetic body 11 are also substantially rectangular.

  As described in the background art, in recent years, in order to improve the portability and convenience of the electronic pen, it is required to make the electronic pen thinner. In order to make the electronic pen thinner, it is necessary to reduce the size of the resonator built in the electronic pen. The resonator is configured by using a coil and a capacitor. However, in order to satisfy the characteristics as the resonator, it is necessary to wind a certain winding, and the coil becomes long. On the other hand, when the coil becomes long, the volume of the coil increases, and the space for arranging the capacitor becomes narrow, resulting in a problem that the resonator becomes large.

Therefore, the resonator 1 according to the present embodiment is configured such that the magnetic body 11 is disposed around the capacitor 10. In other words, the capacitor 10 is arranged in the hollow portion 17 of the magnetic body 11. By setting it as such a structure, in order to maintain the characteristic as a resonator, the size of the coil 13 can be enlarged and the whole resonator can be made compact. At this time, the resonator can be made more compact as the hollow portion 17 of the magnetic body 11 becomes narrower. In the case of configuring an electronic pen, the resonator described above is arranged inside a pen-shaped housing. At this time, since the resonator can be made compact, the pen-shaped housing can also be made thin, and the electronic pen can be made thin.
Further, by providing the magnetic body 11 with the hollow portion 17 and disposing the capacitor 10 in the hollow portion 17, the resonance frequency of the resonator 1 (for example, 500 kHz and its vicinity) can be exchanged and adjusted with a capacitor whose constant has been changed. Therefore, it becomes easy to adjust to the target resonance frequency.

  The invention according to this embodiment described above makes it possible to provide a compact resonator, an electronic pen, and a method for manufacturing the resonator.

<Embodiment 2>
Next, a second embodiment of the present invention will be described.
FIG. 7 is a side view showing the resonator 2 according to the present embodiment. 8 is a cross-sectional view taken along section line VIII-VIII of resonator 2 shown in FIG. FIG. 9 is a cross-sectional view of the resonator 2 shown in FIG. 7 cut along a plane including the central axis 29. 10 and 11 are perspective views for explaining a part of the manufacturing process of the resonator 2 according to the present embodiment. As shown in FIGS. 7 to 9, the resonator 2 according to the present embodiment includes a capacitor 20, a magnetic body 21, an insulator 22, and a coil 23.

  The capacitor 20 is arranged to extend in a direction (first direction) parallel to the shaft 29. The capacitor 20 can be configured by arranging a plurality of capacitor elements on the substrate 31 and connecting these capacitor elements in parallel to each other.

  Specifically, as shown in FIG. 10, a plurality of capacitor elements 20_1 to 20_9 are arranged on the substrate 31. Each of the plurality of capacitor elements 20_1 to 20_9 includes a main body 41 and two electrodes 42 and 43. At this time, it arrange | positions so that the two electrodes 42 and 43 of each capacitor | condenser element 20_1-20_9 may become the long side side of the board | substrate 31, respectively. Each of the one electrodes 42 of each of the capacitor elements 20_1 to 20_9 is connected to each other using a first wiring (not shown) of the substrate 31, and each of the other electrodes 43 of each of the capacitor elements 20_1 to 20_9 is They are connected to each other using a second wiring (not shown) of the substrate 31. The first wiring of the substrate 31 is connected to one end of the coil 23 using the wiring 25_1, and the second wiring of the substrate 31 is connected to the other end of the coil 23 using the wiring 25_2 (FIG. 9).

  9 and 10 show the case where the capacitor 20 is configured by arranging nine capacitor elements 20_1 to 20_9 in a line, but the number of capacitor elements to be used may be other than this. Good. Further, the capacitor elements may be arranged in two rows. The number and arrangement of the capacitor elements can be arbitrarily determined.

  The magnetic body 21 is configured using a deformable sheet-like magnetic body. The sheet-like magnetic body 21 is wound around the capacitor 20 so as to be in close contact with the capacitor 20. A method of winding the magnetic body 21 around the capacitor 20 will be described in detail with reference to FIGS. First, as shown in FIG. 10, double-sided tapes (adhesive layers) 33 and 34 are provided at both ends in the longitudinal direction of the sheet-like magnetic body 21. Next, the substrate 31 (capacitor 20) on which a plurality of capacitor elements are mounted is attached to the sheet-like magnetic body 21 using a double-sided tape 33. Thereafter, the capacitor 20 is rotated in the direction indicated by the arrow in FIG. 11 to wind the magnetic body 21, and finally the end of the magnetic body 21 is attached to the magnetic body 21 using the double-sided tape 34. By using such a method, the sheet-like magnetic body 21 can be wound so as to be in close contact with the capacitor 20 (see FIG. 8).

  For the sheet-like magnetic body 21, for example, an electromagnetic interference suppressing body may be used. For example, Busta Raid (registered trademark) can be used as the sheet-like magnetic body 21. Such a sheet-like magnetic body 21 can be formed, for example, by crushing magnetic powder and spreading the crushed magnetic powder on a resin material or the like.

  The insulator 22 is disposed between the magnetic body 21 and the coil 23. The insulator 22 is provided in order to maintain electrical insulation between the magnetic body 21 and the coil 23. The insulator 22 can be configured using an insulating material such as rubber or resin. The insulator 22 may be omitted as long as the electrical insulation between the magnetic body 21 and the coil 23 can be maintained.

  The coil 23 is disposed around the insulator 22. If the insulator 22 is not provided, the coil 23 is disposed around the magnetic body 21. The coil 23 is electrically connected to the capacitor 20 using wirings 25_1 and 25_2. For example, the coil 23 may be a stranded wire coil formed by twisting a plurality of coils. Thus, the Q value of a coil can be made high by using a stranded wire coil.

  For example, if the thickness of the magnetic material used for the coil core is thin, the resonance frequency may change depending on the external voltage, or the Q value of the coil may be reduced. For this reason, there is a problem that the characteristics of the resonator deteriorate when the resonator is made compact. On the other hand, in the resonator 2 according to the present embodiment, a sheet-like magnetic body 21 is wound so as to be in close contact with the capacitor 20. Therefore, even if the resonator 2 is made compact, the thickness of the magnetic body 21 functioning as the core can be increased, and therefore, the deterioration of the characteristics of the resonator 2 can be suppressed. Here, the thickness of the sheet-like magnetic body and the number of windings are preferably 25 μm or more and 0.2 mm or less, and the number of times is 2 or more and 6 or less for the same reason as in the first embodiment. .

  Moreover, in the technique disclosed in Patent Document 1, since ferrite is used as a magnetic material, there is a problem that if the core is thinned, the ferrite is broken. On the other hand, since the resonator 2 according to the present embodiment uses the sheet-like magnetic body 21, it is possible to prevent the magnetic body 21 from being damaged when the magnetic body 21 is thinned.

  Next, a modification of the resonator according to this embodiment will be described. 12 and 13 are perspective views for explaining another example of the manufacturing process of the resonator according to the present embodiment, and another example of a method of winding the magnetic body 21 around the capacitor 20 will be explained. FIG. When the methods shown in FIGS. 12 and 13 are used, first, as shown in FIG. 12, a double-sided tape (adhesive layer) 35 is provided on the entire surface of the sheet-like magnetic body 21. Next, the substrate 31 (capacitor 20) on which a plurality of capacitor elements are mounted is attached to the longitudinal end of the double-sided tape 35. In other words, the capacitor 20 is attached to the end of the sheet-like magnetic body 21 in the longitudinal direction using the double-sided tape 35. Thereafter, the capacitor 20 is rotated in the direction indicated by the arrow in FIG. By using such a method, the sheet-like magnetic body 21 and the double-sided tape 35 can be wound around the capacitor 20 so as to be in close contact with the capacitor 20 (see FIG. 14).

  Thus, by providing the double-sided tape 35 over the entire magnetic body 21, it is possible to suppress the generation of a gap when the magnetic body 21 is wound, and to increase the volume of the magnetic body 21. Can do. Therefore, the characteristics of the resonator can be further improved.

  In the present embodiment, the capacitor may be configured as a capacitor 20 'shown in FIG. In other words, the capacitor elements 20_1 to 20_9 are arranged so that the one electrodes 42 are adjacent to each other and the other electrodes 43 of the capacitor elements 20_1 to 20_9 are adjacent to each other. Each of one of the electrodes 20_1 to 20_9 may be connected using the first lead frame 51, and each of the other electrodes 43 may be connected using the second lead frame 52. For example, the first and second lead frames 51 and 52 may be soldered to the respective electrodes 42 and 43 of the capacitor element. In this case, the first lead frame 51 and one end of the coil 23 may be connected using the wiring 25_1, and the second lead frame 52 and the other end of the coil 23 may be connected using the wiring 25_2. In the configuration shown in FIG. 15, a substrate on which a plurality of capacitor elements are mounted can be omitted.

  In the present embodiment, the capacitor may be configured as a capacitor 60 shown in FIG. That is, a plurality of capacitor elements (ceramic capacitors) 62_1 to 62_4 are arranged on the substrate 61. Each of the plurality of capacitor elements 62_1 to 62_4 includes two electrodes 63 and 64. At this time, the two electrodes 63 and 64 of the capacitor elements 62_1 to 62_4 are arranged so as to be aligned in the longitudinal direction (first direction) of the substrate. One electrode 63 of each capacitor element 62_1 to 62_4 is connected to each other using a first wiring 65, and each of the other electrode 64 of each capacitor element 62_1 to 62_4 is connected to a second wiring 66. Connected to each other. The first wiring 65 is connected to one end of the coil 23 using the wiring 25_1, and the second wiring 66 is connected to the other end of the coil 23 using the wiring 25_2 (see FIG. 9). In the configuration shown in FIG. 16, since the longitudinal direction of each capacitor element 62_1 to 62_4 and the longitudinal direction of the substrate 61 are parallel, the capacitor 60 (substrate 61) can be made thin. Thereby, the resonator 2 can also be made thin.

  Although the present invention has been described with reference to the above embodiment, the present invention is not limited to the configuration of the above embodiment, and those skilled in the art within the scope of the invention of the claims of the present application claims. It goes without saying that various modifications, modifications, and combinations that can be made are included.

DESCRIPTION OF SYMBOLS 1, 2 Resonator 10 Capacitor 11 Magnetic body 12 Insulator 13 Coil 15_1, 15_2 Wiring 17 Hollow part 19 Axis (central axis)
20 Capacitors 20_1 to 20_9 Capacitor element 21 Magnetic body 22 Insulator 23 Coils 25_1, 25_2 Wiring 29 Axis (central axis)
31 Substrate 33, 34, 35 Double-sided tape (adhesive layer)
41 Main body 42, 43 Electrode 51, 52 Lead frame 60 Capacitor 61 Substrate 62_1-62_4 Capacitor element 63, 64 Electrode 65, 66 Wiring

Claims (11)

A capacitor arranged to extend in a first direction;
A magnetic body disposed around the capacitor with the first direction as a central axis;
A coil disposed around the magnetic body with the first direction as a central axis and electrically connected to the capacitor;
Resonator. The magnetic body has a hollow portion,
The capacitor is disposed in a hollow portion of the magnetic body,
The resonator according to claim 1. The outer peripheral shape in a cross section perpendicular to the first direction of the capacitor is substantially rectangular,
An inner peripheral shape in a cross section perpendicular to the first direction of the magnetic body is a substantially rectangular shape corresponding to the outer peripheral shape of the capacitor;
The resonator according to claim 2. The magnetic body is configured using a deformable sheet-like magnetic body,
The sheet-like magnetic body is wound around the capacitor so as to be in close contact with the capacitor,
The resonator according to claim 1. The magnetic body is configured using a deformable sheet-like magnetic body,
A sheet in which a double-sided tape is laminated on the sheet-like magnetic body is wound around the capacitor so as to be in close contact with the capacitor.
The resonator according to claim 1.   The resonator according to claim 1, wherein an insulator is disposed between the magnetic body and the coil. The capacitor is configured using a plurality of capacitor elements connected in parallel to each other,
The plurality of capacitor elements are arranged on a substrate extending in the first direction so that two electrodes of each capacitor element are on the long side of the substrate, respectively.
Each of the one electrode of each capacitor element is connected to each other using the first wiring of the substrate,
Each of the other electrodes of the capacitor elements is connected to each other using the second wiring of the substrate,
The first wiring is connected to one end of the coil;
The second wiring is connected to the other end of the coil;
The resonator according to any one of claims 1 to 6. The capacitor is configured using a plurality of capacitor elements connected in parallel to each other,
The plurality of capacitor elements are arranged in the first direction so that one electrode of each capacitor element is adjacent to each other and the other electrode of each capacitor element is adjacent to each other. Arranged side by side,
Each one of the electrodes of each capacitor element is connected to each other using a first lead frame,
Each of the other electrodes of the capacitor elements is connected to each other using a second lead frame,
The first lead frame is connected to one end of the coil;
The second lead frame is connected to the other end of the coil;
The resonator according to any one of claims 1 to 6. The capacitor is configured using a plurality of capacitor elements connected in parallel to each other,
The plurality of capacitor elements are arranged on a substrate extending in the first direction so that two electrodes of each capacitor element are aligned in the first direction,
Each of the one electrode of each capacitor element is connected to each other using the first wiring of the substrate,
Each of the other electrodes of the capacitor elements is connected to each other using the second wiring of the substrate,
The first wiring is connected to one end of the coil;
The second wiring is connected to the other end of the coil;
The resonator according to any one of claims 1 to 6. A pen-shaped housing;
The resonator according to any one of claims 1 to 9 disposed inside the housing,
Electronic pen. Adhere the capacitor using double-sided tape at the longitudinal end of the sheet-like magnetic material,
Winding the sheet-like magnetic body to which the capacitor is bonded, and placing the sheet-like magnetic body around the capacitor so as to be in close contact with the capacitor,
Arranging a coil electrically connected to the capacitor around the magnetic body,
A method for manufacturing a resonator.

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