JP2019016313A - Electronic pen - Google Patents

Abstract

To provide an electronic pen capable of increasing proof strength against force in a direction orthogonal to a shaft center direction among force applied to a core body.SOLUTION: An electronic pen having a cylindrical housing, a core body provided such that a tip protrudes from an opening at one end side in a shaft center direction of the cylindrical housing, and a force detector that is accommodated in the cylindrical housing to detect force applied to the core body includes a core body engaging member that is engaged with the core body in a shaft center direction of the cylindrical housing to transmit force applied to the core body and a brake member for braking movement of the core body engaging member in a direction crossing the shaft core direction. The brake member is provided in a position at a tip end side of the core body engaging member relative to an existing position of the force detector in the shaft core direction of the cylindrical housing.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an electronic pen capable of detecting at least a force component in the axial direction of a force applied to a core body.

  The electronic pen is configured to be able to detect the contact of the tip of the core body with the input surface of the position detection sensor and the force (writing pressure) applied when the tip of the core body contacts. There is. In other words, the end of the electronic pen core opposite to the tip is fitted directly or indirectly via a force transmission member that is a separate member. And it is comprised so that the force applied to the front-end | tip part side of a core can be detected with a force detection part.

  As a configuration of the force detection unit, a dielectric capacitor is mechanically sandwiched between two electrodes, and a capacitance variable capacitor (see Patent Document 1) having a configuration in which the capacitance between the two electrodes changes according to writing pressure, or a semiconductor device In many cases, a variable capacitance capacitor (see Patent Document 2) is used, but the use of a strain gauge has also been proposed (see Patent Document 3 and Patent Document 4). In this case, the strain gauge is attached to a strain generating body that generates a strain corresponding to the force applied to the tip of the core body.

  A strain gauge is a mechanical sensor for measuring strain of an object, and a semiconductor strain gauge is often used in an electronic pen. Semiconductor strain gauges are strain gauges that use the piezoresistive effect, in which the electrical resistivity of a semiconductor changes with stress, and the piezoelectric effect, in which polarization (surface charge) is proportional to the applied pressure. is there.

  As a force detection unit using a strain gauge, a so-called triaxial force detection unit has also been proposed, and it is conceivable that an electronic pen mainly uses this triaxial force detection unit (see Patent Document 5 and Patent Document 6). ). When this triaxial force detection unit using strain gauges is used for an electronic pen, not only the pressure (writing pressure) in the axial direction of the electronic pen perpendicular to the input surface of the position detection sensor, but also the input of the position detection sensor Even when the electronic pen is inclined at a predetermined angle with respect to the surface, the force applied to the pen tip of the electronic pen can be detected, and the inclination angle of the electronic pen with respect to the input surface of the position detection sensor is also detected. It can be convenient.

JP 2011-186803 A JP 2013-161307 A US Pat. No. 5,548,092 US Patent No. 9322732 JP 2010-164495 A U.S. Pat. No. 4,896,543

  In the electronic pen as described above, in order that the force applied to the tip of the core body can be detected by the force detector, the tip of the core body has an axial direction (Z-axis direction). ) As well as directions orthogonal to the axial direction (X-axis direction and Y-axis direction).

  The force detection unit is configured to be fitted to the core body at the end opposite to the tip of the core body and detect a force applied to the tip of the core body. For this reason, of the force applied to the tip of the core body, the force component in the X-axis direction and the Y-axis direction orthogonal to the axial direction is expressed as a bending moment according to the length of the core body in the axial direction. Since the force is transmitted to the force detection unit, a large force is applied to the coupling portion between the force detection unit and the core, and the force detection unit may be damaged.

  Further, in recent years, with the miniaturization of electronic pens, the core body and the force transmission member to which the core body is fitted have become very thin. For this reason, the force transmission member to which the core body and the core body are fitted may be damaged by a large bending moment due to the force component in the X-axis direction and the Y-axis direction of the external force applied to the tip of the core body. .

  It is an object of the present invention to provide an electronic pen that can solve the above problems.

To solve the above problem,
A cylindrical housing, a core body provided so that a tip projects from an opening on one end side in the axial direction of the cylindrical housing, and the core body housed in the cylindrical housing An electronic pen provided with a force detector for detecting the force applied to
A core body fitting member that is fitted to the core body and transmits a force applied to the core body to the force detector in the axial direction of the cylindrical housing;
A braking member that brakes the movement of the core body fitting member in a direction intersecting the axial direction;
With
The braking member is an electron that is provided at a position closer to a distal end side of the core body of the core body fitting member than an existing position of the force detection portion in an axial direction of the cylindrical casing. Provide a pen.

  In the electronic pen having the above-described configuration, the electronic pen is fitted into a core-body fitting member protruding from the opening of the housing. And the force applied to the front-end | tip of a core is transmitted to a force detection part via a core body fitting member. Then, in the axial direction of the cylindrical housing, the axis of the core body fitting member is provided by a braking member provided at a position closer to the distal end side of the core body than the position where the force detection unit is present. The movement in the direction crossing the heart direction is braked.

  Therefore, the bending moment due to the force in the direction intersecting the axial center direction due to the force applied to the tip of the core body depends on the distance from the end of the core body fitting member to the braking position by the braking member. Thus, since the bending moment corresponding to the entire length of the core body fitting member in the axial direction is smaller, the risk of damage to the core body and the core body fitting member can be reduced.

It is a figure which shows embodiment of the electronic pen by this invention with an electronic device provided with a position detection apparatus. It is sectional drawing which shows the structural example of the principal part of 1st Embodiment of the electronic pen by this invention. It is a figure for demonstrating the structural example of the principal part of 1st Embodiment of the electronic pen by this invention. It is a figure for demonstrating the structural example of the principal part of 1st Embodiment of the electronic pen by this invention. It is a figure for demonstrating the structural example of the principal part of 1st Embodiment of the electronic pen by this invention. It is a figure for demonstrating 1st Embodiment of the electronic pen by this invention. It is a figure for demonstrating 1st Embodiment of the electronic pen by this invention. It is a figure for demonstrating 1st Embodiment of the electronic pen by this invention. It is a figure for demonstrating the structural example of the electronic circuit of 1st Embodiment of the electronic pen by this invention. It is a figure for demonstrating the example of a structure of a part of electronic circuit of 1st Embodiment of the electronic pen by this invention. It is a figure for demonstrating the example of a structure of a part of electronic circuit of 1st Embodiment of the electronic pen by this invention. It is a figure for demonstrating the example of a structure of a part of electronic circuit of 1st Embodiment of the electronic pen by this invention. It is sectional drawing which shows the structural example of the principal part of 2nd Embodiment of the electronic pen by this invention. It is a figure for demonstrating the example of a part of structure of 2nd Embodiment of the electronic pen by this invention. It is sectional drawing which shows the structural example of the principal part of 3rd Embodiment of the electronic pen by this invention. It is a figure for demonstrating the example of a part of structure of 3rd Embodiment of the electronic pen by this invention. It is a figure for demonstrating the other structural example of the braking member used with embodiment of the electronic pen by this invention. It is a figure for demonstrating the other structural example of the braking member used with embodiment of the electronic pen by this invention. It is a figure for demonstrating the other structural example of the braking member used with embodiment of the electronic pen by this invention. It is a figure for demonstrating the other structural example of the braking member used with embodiment of the electronic pen by this invention. It is a figure for demonstrating the other structural example of the braking member used with embodiment of the electronic pen by this invention. It is a figure for demonstrating the other structural example of the braking member used with embodiment of the electronic pen by this invention.

  Several embodiments of an electronic pen according to the present invention will be described below with reference to the drawings.

[First Embodiment]
FIG. 1 shows an example of an electronic pen 1 according to a first embodiment of the present invention and a tablet information terminal 2 as an example of an electronic apparatus that uses the electronic pen 1 as an input means. The electronic pen 1 according to this embodiment is an active electrostatic electronic pen that sends a signal to a sensor of a position detection device provided in the tablet information terminal 2 by electrostatic coupling.

  In this example, the tablet-type information terminal 2 includes a display screen 2D of a display device such as an LCD (Liquid Crystal Display), for example. A sensor 2S of the detection device is provided.

  The electronic pen 1 is configured by providing, for example, a battery 4 formed of a primary battery or a secondary battery as a power source, an electronic circuit 5, and a force detection unit 6 in a hollow portion of a cylindrical housing 3. . In this embodiment, the force detection part 6 is attached to the force reception unit 10 so that it may mention later.

  The force detector 6 detects a force applied to the core 7 of the electronic pen 1. In this example, as will be described later, in this example, a semiconductor strain gauge is used not only in the Z-axis direction but also in the X-axis direction. And it is comprised so that the force component of the triaxial direction of a Y-axis direction can be detected.

  The electronic circuit 5 includes a signal transmission circuit, a detection circuit that detects a force component in the three-axis direction of the force applied to the tip of the core body 7 detected by the force detection unit 6, and a control circuit including a microprocessor, for example. 1 is disposed on a printed circuit board (not shown in FIG. 1). A driving voltage formed from the voltage from the battery 4 is supplied to the signal transmission circuit, the detection circuit, and the control circuit of the electronic circuit 5, and based on the control of the control circuit, the force components in the three-axis directions in the detection circuit And a signal from the signal transmission circuit is sent out to the sensor 2S by electrostatic coupling through the core body 7 made of a conductive member.

  In this example, the control circuit of the electronic circuit 5 transmits the force components in the three axial directions of the force applied to the tip of the core body 7 detected by the force detector 6 from the signal transmission circuit to the sensor 2S through the core body 7. Control is performed for transmission. The electronic pen 1 is provided with, for example, a Bluetooth (registered trademark) standard wireless communication unit, and the force component in the three-axis direction of the force applied to the tip of the core body 7 detected by the force detection unit 6 You may make it transmit to the tablet-type information terminal 2 side through a wireless communication part.

[Mechanical Configuration of Electronic Pen 1 of First Embodiment]
FIG. 2 is a diagram illustrating a configuration example on the pen tip side of the electronic pen 1 according to the first embodiment, and is a longitudinal sectional view of the electronic pen 1. In this embodiment, the force receiving unit that receives the force applied to the core body 7 and transmits the force to the force detecting unit 6 is configured as the force receiving unit 10. The force receiving unit 10 has a modularized configuration. In this embodiment, the force receiving unit 10 is provided between the front cap portion 8 on the pen tip side and the cylindrical housing 3 of the electronic pen 1.

  The force receiving unit 10 includes, for example, a strain body portion 12 in which a force detector 6 made of a semiconductor strain gauge is attached in a unit housing (unit case) 11 made of resin, for example, and a braking member. 13 is provided. The core body fitting member 14 is provided in a state in which the side opposite to the pen nib side in the axial direction is coupled to the strain body 12 and engages with the braking member 13.

  In this example, the unit case 11 of the force receiving unit 10 includes a cylindrical outer unit case 111, a cylindrical middle unit case 112, and a cylindrical unit case holder 113. As shown in FIG. 2, the diameter (outer diameter) of the central portion 111 a in the axial direction of the outer peripheral side surface of the cylindrical outer unit case 111 is selected to be equal to the outer diameter of the housing 3. In the axial direction of the outer peripheral side surface of the outer unit case 111, the diameter (outer diameter) of the portion 111b closer to the pen tip side than the central portion 111a and the diameter (outer diameter) of the portion 111c opposite to the pen tip side are A value smaller than the diameter of the central portion 111a is selected.

  A pen point side portion 111b of the outer unit case 111 is a portion fitted to the front cap portion 8 in the axial direction, and a portion 111c opposite to the pen point side of the outer unit case 111 is In the axial direction, the unit case holder 113 is fitted.

  As shown in FIG. 2, the front cap portion 8 is hollow inside and has a truncated cone shape in which the pen tip side is tapered, and an opening 8 a through which the core body 7 is inserted has a tapered end portion. I have. In this example, the opposite side of the front cap portion 8 from the opening 8 a is fitted to the pen point portion 111 b of the outer unit case 11. In this example, the inner diameter of the front cap portion 8 on the side opposite to the opening 8 a is set according to the outer diameter of the pen point side portion 111 b of the outer unit case 111.

  In this case, in this example, as shown by a dotted line in FIG. 2, the protrusion provided on the inner wall opposite to the opening 8 a of the front cap portion 8 is formed on the pen tip side of the outer unit case 111. It is made to fit in the concave groove formed in the portion 111b. Thereby, the front cap part 8 and the outer unit case 111 are comprised so that it may not mutually rotate centering on an axial center direction. The outer diameter of the front cap 8 opposite to the opening 8 a is selected to be equal to the outer diameter of the central portion 111 a of the outer unit case 111.

  Further, the unit case holder 113 has a pen tip side portion 113a in the axial direction of the pen tip side portion 113a whose outer diameter is equal to the outer diameter of the housing 3, and whose inner diameter is opposite to the pen tip side of the outer unit case 111. The portion 113c is adapted to the outer diameter of the portion 111c, and the portion 113b opposite to the pen tip side has an outer diameter corresponding to the inner diameter of the housing 3. The diameter is smaller than the outer diameter of the strain-generating portion 122 of the strained body portion 12. Therefore, a step portion 113 c is formed in the hollow portion of the unit case holder 113 in the axial direction, and the step portion 113 c is configured to engage with the strain body portion 12.

  Then, the pen tip portion 113 a of the unit case holder 113 is fitted to the portion 111 b of the outer unit case 111 opposite to the pen tip side. In this case, in this example, as shown by a dotted line in FIG. 2, the protrusion provided on the inner wall of the pen tip side portion 113a of the unit case holder 113 is the pen tip side of the outer unit case 111. It is adapted to be fitted into a concave groove formed in the opposite portion 111c. Thus, the unit case holder 113 and the outer unit case 111 are configured not to rotate with respect to each other about the axial direction.

  And the housing | casing 3 is fitted to the part 113b on the opposite side to the pen point side of the unit case holder 113 in an axial direction. In this case, in this example, as indicated by a dotted line in FIG. 2, the pen tip of the housing 3 is formed in the concave groove provided on the inner wall of the portion 113 b opposite to the pen tip side of the unit case holder 113. A protrusion formed on the side portion is fitted. Thus, the unit case holder 113 and the housing 3 are configured not to rotate with respect to each other about the axial direction.

  The diameter (inner diameter) of the hollow part of the outer unit case 111 is not constant, and as shown in FIG. 2, the opening vicinity part 111d of the part 111b on the pen tip side has an inner diameter smaller than other parts. For this reason, in the hollow part of the outer unit case 111, the step part 111e is formed in the axial direction.

  The outer diameter of the cylindrical middle unit case 112 is substantially equal to or slightly smaller than the inner diameter (large inner diameter) of the outer unit case 111 other than the portion near the opening 111d. Further, in this example, the inner diameter of the middle unit case 112 is approximately equal to the smaller inner diameter of the portion near the opening 111d of the outer unit case 111. The middle unit case 112 is housed in a portion having a large inner diameter of the outer unit case 111, and the unit case holder 113 is fitted to the outer unit case 111, so that the outer unit case and the strain member 12 and the braking member 13 are combined. 111 is fixed.

  As shown in FIG. 2, the core body fitting member 14 is formed of an elongated cylindrical body having an outer diameter of about 2 mm, for example, and is made of, for example, metal. One end side in the axial center direction of the core body fitting member 14 is a pen tip side, and a part of the core body 7 is inserted and fitted into the hollow portion on the one end side.

  In this example, as shown in FIG. 2, the core body 7 is protected by a pen tip protection member 72 made of, for example, a hard resin on one pen tip portion 71a side of a signal transmission core 71 made of a conductive material such as a conductive metal. The structure is provided. In this example, the portion of the signal transmission core 71 that is not covered with the pen point protection member 72 is exposed to the outside, but its surface is covered with insulation. However, the end 71 b opposite to the pen tip side of the signal transmission core 71 is provided with an insulating coating so as to be electrically connected to the circuit of the printed circuit board 16 provided in the housing 3 of the electronic pen 1. Instead, it is exposed.

  The diameter of the signal transmission core 71 is about 1 mm, for example, and is a value smaller than the diameter of the hollow portion 14 a of the cylindrical core body fitting member 14. In this example, the pen tip portion 71 a covered with the pen tip protection member 72 of the signal transmission core 71 is a sphere having a diameter slightly larger than the diameter of the portion not covered with the pen tip protection member 72. Yes.

  The nib protection member 72 of the core body 7 includes a pen nib part 72 a that covers the nib part 71 a of the signal transmission core 71 and a fitting part 72 b that is inserted into the hollow part 14 a of the core body fitting member 14. . The nib portion 72a has a conical shape with a rounded top, and a step portion 72c having a slightly larger diameter than the fitting portion 72b on the bottom surface side of the conical shape.

  In this example, the fitting portion 72b of the core body 7 is configured integrally and continuously with the stepped portion 72c of the pen tip portion 72a, and has a columnar shape corresponding to the hollow portion 14a of the core body fitting member 14. Prepare. In this case, the outer diameter of the fitting portion 72 b of the core body 7 is set to a value slightly smaller than the diameter (inner diameter) of the hollow portion 14 a of the core body fitting member 14. The fitting portion 72b of the core body 7 is fitted by being press-fitted into the hollow portion 14a of the core body fitting member 14. However, when the core body 7 is pulled out, the core body 7 can be easily pulled. It is configured so that it can be detached from the body fitting member 14.

  In this example, the outer diameter of the stepped portion 72c of the nib portion 72a of the core body 7 is larger than the diameter (inner diameter) of the hollow portion 14a of the core body fitting member 14 in this example. The outer diameter of the member 14 is selected to be substantially equal, and the stepped portion 72c abuts with the end surface on the pen nib side in the axial direction of the core body fitting member 14 so that the core body 7 is fitted to the core body. The coupling position in the axial direction with respect to the member 14 is restricted.

  As shown in FIG. 2, the core body fitting member 14 is coupled to the strain body 12 by fitting the other end side in the axial direction to the strain body 12. In this embodiment, the core body fitting member 14 constitutes a force transmission member for transmitting the force applied to the core body 7 to the strain body 12.

  FIG. 3 is a diagram for explaining a configuration example of the strain generating body portion 12 and a joint portion between the strain generating body portion 12 and the core body fitting member 14. FIG. 3A shows a portion composed of the core body fitting member 14 and the strain body portion 12 in the X-axis direction or the Y-axis direction orthogonal to the Z-axis direction that is the direction of application of the writing pressure of the electronic pen 1. On the other hand, in this example, it is a front view as seen from the Y-axis direction, and FIG. 3B is a longitudinal sectional view of the coupling portion of the core body fitting member 14 and the strain body part 12 (in the direction including the Z-axis direction). FIG. 3 (C) and 3 (D) show the displacement state and the X-axis direction or the Y-axis when a force in the Z-axis direction is applied to the core body fitting member 14 and the strain body 12. It is a figure for demonstrating the displacement state when force is applied to the direction. In FIGS. 3C and 3D, it is emphasized that a displacement larger than the actual displacement for making the displacement state easy to understand is shown.

  The strain body portion 12 includes a fitting portion 121 having a fitting hole 121 a for fitting one end side of the core body fitting member 14, and a strain portion 122. As shown in FIG. 3B, the strain-generating portion 122 is configured by providing a thin disk-like diaphragm 1221 that can be elastically displaced on one opening side of a cylindrical holding body 1222. Yes. A strain gauge 60 as an example of the force detection unit 6 is attached to the diaphragm 1221. The strain generating portion 122 is integrally coupled to the fitting portion 121 at the center portion of the diaphragm 1221.

  The fitting hole 121a of the fitting part 121 of the strain body 12 is a columnar hole having a diameter equal to or slightly smaller than the outer diameter of the core body fitting member 14, and the axial direction of the core body fitting member 14 The side opposite to the pen tip side is fitted into the fitting hole 121a and bonded by an adhesive, whereby the strain-generating body portion 12 and the core body fitting member 14 are coupled.

  And as shown in FIG.2 and FIG.3, in the hollow part 14a of the core body fitting member 14, on the opposite side to the pen tip side fitted in the fitting hole 121a of the fitting part 121, In this embodiment, an electrically connecting member 15 having conductivity is provided. The electrical connection member 15 is made of, for example, a metal or a resin including a conductive metal and having conductivity, and the insulating coating of the signal transmission core 71 of the core body 7 is removed. A fitting recess 15a into which the end 71b is fitted is formed. The signal transmission core 71 of the core body 7 is such that the end portion 71b is provided in the core body fitting member 14 when the core body 7 is fitted into the core body fitting member 14. The length is such that it fits into the fitting recess 15 a of the connecting member 15.

  As shown in FIG. 2, the fitting portion 121 of the strain generating body portion 12 and the diaphragm 1221 of the strain generating portion 122 are formed with through holes 121 b and 1221 a penetrating through the central portion thereof. Then, from the electrical connection member 15 housed in the core body fitting member 14, the conductive wire portion 15 b passes into the housing 3 through the fitting portion 121 and the through holes 121 b and 1221 a of the diaphragm 1221. It leads out to the printed circuit board 16 arrange | positioned. The conductive wire portion 15b may be made of the same material as the electrical connection member 15, or in the case where the electrical connection member 15 is made of a conductive resin, a conductive metal You may comprise so that a wire may be couple | bonded with the said member 15 for electrical connection in the state electrically connected with the member 15 for electrical connection.

  As shown in FIGS. 2 and 3, the force detection unit 6 is configured on the surface of the diaphragm 1221 of the strain generating portion 122 of the strain generating body portion 12 opposite to the coupling surface with the fitting portion 121. A strain gauge 60 is attached and attached. As shown in FIG. 4, the strain gauge 60 has a plurality of strain sensing elements 62X1, 62X2, 62Y1, 62Y2, 62Z1, 62Z2, 62Z3 on a flexible substrate 61 made of, for example, a disc-shaped insulating film sheet. , 62Z4 are provided. A through-hole 61 a for inserting the conductive wire portion 15 b led out from the electrical connection member 15 is formed at the center position of the flexible substrate 61.

  Here, the strain sensitive elements 62X1 and 62X2 are for detecting strain in the X-axis direction (direction orthogonal to the Z-axis direction), and the strain-sensitive elements 62Y1 and 62Y2 are configured in the Y-axis direction (Z-axis direction). The strain sensing elements 62Z3, 62Z1, 62Z2, and 62Z4 are for detecting strain in the Z-axis direction. The arrangement positions of the plurality of strain sensing elements 62X1, 62X2, 62Y1, 62Y2, 62Z1, 62Z2, 62Z3, and 62Z4 are described in Patent Document 5 and Patent Document 6 described above and are well known. Then, explanation is omitted.

  Next, the braking member 13 is for braking the displacement of the core body fitting member 14 with respect to loads (including impact loads) in the X-axis direction and the Y-axis direction. FIG. 5 is a view of the braking member 13 as seen from the surface side including the X-axis direction and the Y-axis direction. As shown in FIGS. 2 and 5, the braking member 13 is formed of an elastic member having a disk-like thin plate shape, for example, a metal plate in this example. In this example, the diameter of the braking member 13 is selected to be equal to or slightly smaller than the inner diameter of the outer unit case 111 of the unit case 11. Then, in this example, the center portion of the braking member 13 has a through fitting whose diameter is substantially equal to the outer diameter of the core body fitting member 14 so that the core body fitting member 14 is inserted and fitted therethrough. A hole 13a is formed.

  The braking member 13 of this embodiment has a uniform braking characteristic with respect to a radial force that intersects the axial direction of the core body fitting member 14 around the through-fitting hole 13a, that is, isotropic. It is configured to have a braking characteristic. In this example, in order to realize this isotropic braking characteristic, a plurality of braking members 13 are provided in the circumferential direction at a predetermined radial position from the center position of the through-fitting hole 13a as shown in FIG. Arc-shaped slits are formed at equiangular intervals, and the core body fitting member 14 fitted to the braking member 13 can be displaced with substantially uniform braking characteristics in the X-axis direction and the Y-axis direction. It is supposed to be. In the example of FIG. 5, the brake member 13 is formed with four arc-shaped slits 13b and 13c, respectively, in the circumferential direction at two different radial positions.

  In this case, in this example, the center position in the circumferential direction of each of the four inner arc-shaped slits 13b and the center position in the circumferential direction of each of the four outer arc-shaped slits 13c are: They are different from each other by 45 degrees. Each of the four arc-shaped slits 13b and 13c is formed as an equal angular range. The angular range θ in which each of the arc-shaped slits 13b and 13c is formed is, for example, 4 to 70 degrees, and θ = 70 degrees in the example of FIG.

  In the above example, the brake member 13 is made of a metal having elasticity, but a hard resin material having elasticity may be used.

  Further, the slits of the braking member 13 may be formed in the circumferential direction of one radial position instead of two radial positions, or may be formed in the circumferential direction of three or more radial positions. . The number of slits formed in the circumferential direction at one radial position is not limited to four as in the above-described example, and may be two or more.

  The force receiving unit 10 composed of the components as described above is assembled as follows and integrated into a module configuration.

  First, the brake member 13 is housed so as to be disposed at the position of the step 11e on the pen tip side in the hollow portion of the outer unit case 111. Next, the middle unit case 112 is inserted into the hollow portion of the outer unit case 111, and a thin braking member is inserted between the pen-side edge of the middle unit case 112 and the stepped portion 111 e of the outer unit case 111. The periphery of 13 is clamped. Thus, the braking member 13 is locked at a position closer to the pen tip side in the axial direction of the force receiving unit 10. In this case, the periphery of the braking member 13 is fixed with an adhesive to one or both of the pen tip side edge of the middle unit case 112 and the stepped portion 111e of the outer unit case 111 that sandwich the periphery. You may do it.

  Next, the strain body 12 to which the core body fitting member 14 is coupled is made to protrude outward through the penetrating fitting hole 13a of the braking member 13 toward the pen tip side. It is inserted into the hollow part of the unit case 111. In this state, the middle unit case 112 is pressed to the stepped portion 111 e side of the outer unit case 111 by the strained portion 122 of the strained body portion 12. In this state, the unit case holder 113 is fitted to the outer unit case 111 from the side opposite to the pen tip side. Thus, the force receiving unit 10 is completed as a module.

  The force receiving unit 10 configured as described above has a braking member 13 fixed in the vicinity of the pen tip side opening of the unit case 11 in the axial direction, and the side opposite to the pen tip side of the unit case 11. In addition, in this example, a configuration is provided in which a force detection unit 6 including a strain gauge 60 is provided. In the force receiving unit 10 of this example, the distance in the axial direction between the position of the braking member 13 and the position of the diaphragm 1221 of the strain-generating body portion 12 to which the strain gauge 60 is attached is the middle unit case. 112 is substantially equal to the length in the axial direction. That is, the middle unit case 112 serves as a member for separating the braking member 13 and the diaphragm 1221 of the strain body 12 in the axial direction.

  The front cap portion 8 is fitted to the pen tip side of the outer unit case 111 of the force receiving unit 10, and the housing 3 is fitted to the unit case holder 113. Before the unit case holder 113 is fitted, the conductive wire portion 15b led out from the electrical connection member 15 of the core fitting member 14 of the force receiving unit 10 is soldered to the printed circuit board 16, for example. The electronic circuit formed on the printed circuit board 16 is electrically connected.

  Furthermore, the core body 7 is inserted into the hollow portion of the core body fitting member 14 from the signal transmission core 71 side through the opening 8 a of the front cap section 8, and the fitting section 72 b of the nib protection member 72 of the core body 7. Is fitted to the core body fitting member 14. At this time, the end 71 b of the core body 7 opposite to the pen tip side of the signal transmission core 71 is fitted into the fitting recess 15 a of the electrical connection member 15 provided at the end of the core body fitting member 14. Are electrically connected to the electronic circuit 5 formed on the printed circuit board 16.

  In the state configured as described above, when a force (writing pressure) in the Z-axis direction is applied to the nib portion 72 a of the core body 7, the force is applied to the core body fitting member of the force receiving unit 10. 14 and the fitting portion 121 of the strain-generating body portion 12 are transmitted to the strain-generating portion 122. Then, tensile / compressive stress is applied to the diaphragm 1221 of the strain generating portion 122, and the diaphragm 1221 is displaced in the Z-axis direction of the core body fitting member 14 and the fitting portion 121 as shown in FIG. It curves so as to protrude downward depending on. The strain gauge 60 is displaced according to the curvature of the diaphragm 1221 and is extended and displaced as indicated by an arrow in FIG. For this reason, the strain-sensitive elements 62X1, 62X2, 62Y1, 62Y2, 62Z1, 62Z2, 62Z3, and 62Z4 disposed on the flexible substrate 61 of the strain gauge 60 are similarly displaced, and the resistance value thereof is Since it changes, the force (writing pressure) in the Z-axis direction can be detected by detecting the change.

  Further, not only the force component in the Z-axis direction but also a force component in the X-axis direction or the Y-axis direction orthogonal to the Z-axis direction is applied to the core body 7. The force component in the X-axis direction or the Y-axis direction applied to the core body 7 is applied to the strain-generating body portion 12 as a bending moment corresponding to the length of the core body fitting member 14 in the force receiving unit 10. Bending stress and shearing stress are applied to the diaphragm 1221 of the strain generating portion 122. Therefore, in the diaphragm 1221, as shown in FIG. 3D, the diaphragm 1221 extends in front of the center position of the strain generating body portion 12 in the direction of applying the force in the X-axis direction or the Y-axis direction. The diaphragm 1221 is displaced so as to contract on the rear side of the center position of the strain generating body portion 12. The strain corresponding to this displacement is detected by the strain sensing elements 62X1, 62X2, 62Y1, 62Y2, 62Z1, 62Z2, 62Z3, 62Z4 provided in the strain gauge 60, and the X axis direction and the Y axis direction are detected. Force components can be detected. Then, the tilt of the electronic pen and the rotation of the electronic pen can be detected from the detected force.

  By the way, the electronic pen 1 has an elongated cylindrical casing 3, and the force of an external force applied to the pen tip portion 72a of the core body 7 protruding to one opening side of the casing 3 in the axial direction. As shown in FIGS. 2 and 3, the component is transmitted to the strain generating portion 122 of the strain generating body portion 12 via the core body fitting member 14 having a predetermined length in the axial direction.

  In this case, the force in the Z-axis direction (writing pressure in the case of the electronic pen 1) applied to the core body 7 is a diaphragm of the strain generating portion 122 of the strain generating body portion 12 via the core body fitting member 14. Directly applied to 1221, the diaphragm 1221 generates tensile / compressive stress that causes the material to expand and contract. The magnitude of the tensile / compressive stress is determined by the relationship between the cross-sectional area of the diaphragm 1221 and the load.

  On the other hand, force components in the X-axis direction and the Y-axis direction orthogonal to the Z-axis direction applied to the core body 7 are applied to the strain-generating portion 122 of the strain-generating body portion 12 as a bending moment via the core body fitting member 14. In addition, the diaphragm 1221 is subjected to bending stress and shear stress. This bending stress and shearing stress correspond to the bending moment corresponding to the distance from the diaphragm 1221 to the power point. In the electronic pen 1, the force point of the external force is the pen tip portion 72 a of the core body 7, so the distance from the diaphragm 1221 to the force point is the length of the core body fitting member 14 or the core body fitting member 14. The length to the pen tip portion 72a of the core body 7 fitted to the core body fitting member 14 is added to this length, and the bending moment increases. Therefore, the bending stress and the shear stress applied to the diaphragm 1221 of the strain generating portion 122 of the strain generating body portion 12 based on the force components in the X-axis direction and the Y-axis direction are applied to the diaphragm 1221 based on the force component in the Z-axis direction. Larger than tensile / compressive stress.

  For this reason, the distortion generated in the diaphragm 1221 due to the force component in the X-axis direction and the Y-axis direction applied to the core body 7 is relatively large, and the force component in the X-axis direction and the Y-axis direction is relatively highly sensitive. However, it is difficult to detect the force component (writing pressure) in the Z-axis direction with high sensitivity.

  Incidentally, there is generally a relationship as shown in FIG. 6 between the stress applied to the strain generating body and the generated strain, and the relationship of the strain ε with respect to the stress σ is a linear proportional relationship. When stress exceeding the elastic region is applied, as shown in FIG. 6, the plastic region is reached, and the relationship between the stress and the strain is not a straight line, and in the worst case, the fracture occurs. Therefore, it is important for the strain body to make the applied stress fall within the elastic range.

  Considering this, in order to increase the sensitivity in the Z-axis direction in the force receiving unit 10 of the above example, the diaphragm 1221 is considered to be within a range that can be accommodated in the elastic range shown in FIG. It is conceivable to increase the tensile / compressive stress applied to the diaphragm 1221 based on the force component in the Z-axis direction.

  However, when the thickness of the diaphragm 1221 is reduced in order to increase the sensitivity in the Z-axis direction, the diaphragm 1221 itself and the shearing stress are caused by bending stress and shear stress based on a large bending moment due to force components in the X-axis direction and the Y-axis direction. In addition, there is a possibility that breakage may occur at the joint portion between the diaphragm 1221 and the holding portion 1222. That is, in the force receiving unit 10 of the above example, the bending stress and the shear stress based on the bending moment due to the force component in the X-axis direction and the Y-axis direction are larger than the tensile / compressive stress due to the force component in the Z-axis direction. Even if the thickness of the diaphragm 1221 is reduced considering that the tensile / compressive stress based on the force component in the Z-axis direction falls within the elastic range, the force in the X-axis direction and the Y-axis direction The bending stress and shear stress due to the components may exceed the elastic range, and there is a possibility that breakage occurs.

  In addition, when the thickness of the diaphragm 1221 is reduced, the diaphragm 1221 may be broken when an impact load is applied in the Z-axis direction.

  Furthermore, the electronic pen 1 in recent years is becoming thinner. For this reason, the core body 7 is very thin. In this embodiment, the core body 7 is configured to be fitted to the core body fitting member 14 at the portion of the fitting portion 72b of the pen point protection member 72, and the portion of the signal transmission core 71 is fitted to the core body fitting. It is in a state protected by the member 14. However, in the electronic pen 1 of this embodiment, the core body fitting member 14 is also thin. Therefore, the core body fitting member 14 to which the core body 7 is fitted may be damaged by a large bending moment caused by force components in the X-axis direction and the Y-axis direction of the external force applied to the nib portion 71a of the core body 7. There is.

  However, in the force receiving unit 10 of the electronic pen 1 of this embodiment, the portion of the core body fitting member 14 that is closer to the pen tip side than the fitting portion with the fitting portion 121 of the strain generating body portion 12 is braked. The member 13 is configured to brake the displacement in the X-axis direction and the Y-axis direction.

  Therefore, in the force receiving unit 10 of the electronic pen 1 of this embodiment, when the thickness of the diaphragm 1221 is reduced, even when an impact load is applied in the Z-axis direction, the resistance to breakage of the diaphragm 1221 is improved. Can be improved. In this embodiment, the presence of the braking member 13 can reduce the risk of damage to the core body 7 and the core body fitting member 14 itself.

  FIG. 7 shows an example of a simulation result of the braking effect when the braking member 13 is attached to the force receiving unit 10. In the example of FIG. 7, the outer diameter of the core body fitting member 14 is 2 mm, and the braking member 13 is attached at a position 10 mm away from the position of the diaphragm 1221 of the strain body 12 in the axial direction. It is said. Further, the axial distance between the end surface on the pen tip side of the core body fitting member 14 and the position of the diaphragm 1221 of the strain body 12 is 25 mm, and the end surface position of the core body fitting member 14 is In this case, a force of 10 N (Newton) is applied in each of the vertical direction (Z-axis direction) and the horizontal direction (X-axis direction or Y-axis direction). In this example, the disc-shaped braking member 13 has an outer diameter of 5.6 mm and a thickness of 0.2 mm.

  In the simulation result table of FIG. 7, “displacement” is the displacement (μm) on the end surface side on the pen tip side of the core body fitting member 14, and “stress” is the diaphragm of the strain body 12. The stress generated in 1221 (MPa; megapascal).

  From the table of FIG. 7, in the longitudinal (Z-axis direction) load, there is little difference in both “displacement” and “stress” between when the braking member 13 is present and when the braking member 13 is not present. I understand. In other words, in the longitudinal load, the displacement of the core body fitting member 14 and the stress generated in the diaphragm 1221 are hardly affected by the presence of the braking member 13, and the axial force applied to the core body 7 (writing brush) Pressure) can be detected with high sensitivity.

  Further, from the table of FIG. 7, in the lateral direction (X-axis direction or Y-axis direction) load, when the braking member 13 is present, the core body fitting member 14 is compared with when the braking member 13 is not present. It can be seen that the displacement and the stress generated in the diaphragm 1221 can be greatly reduced. That is, with respect to the lateral load, the brake member 13 can suppress the displacement of the core body fitting member 14 and the stress generated in the diaphragm 1221, so that the core body fitting member 14 is broken or the diaphragm 1221 is broken. Fear can be reduced.

  Further, as shown in FIG. 8, the plate thickness of the braking member 13, the width and length of the arc-shaped slit, the number of arc-shaped slits in the radial direction of the braking member 13, the size of the outer diameter of the braking member 13, etc. By changing the attribute, it is possible to control the strength of the braking force of the braking member 13 against the core body fitting member 14 with respect to the lateral load. For example, the greater the plate thickness of the braking member 13, the smaller the number of slits, and the larger the outer diameter, the stronger the braking force against the lateral load of the core body fitting member 14, The risk of damage to the core body fitting member 14 and the breakage of the diaphragm 1221 can be reduced.

  When the braking force against the lateral load of the core body fitting member 14 is controlled, the core body 7 fitted to the core body fitting member 14 is similarly controlled. For this reason, the touch which the user of the electronic pen 1 receives from the nib part 72a when the nib part 72a of the core body 7 is brought into contact with the input surface of the position detection sensor and an instruction is input (writing input) with force. Changes according to the braking force of the braking member 13. That is, the user of the electronic pen 1 feels the pen tip 72a of the electronic pen 1 hard when the braking force by the braking member 13 is strong, and the pen tip 72a of the electronic pen 1 when the braking force by the braking member 13 is weak. Feel soft.

  Therefore, according to the electronic pen 1 of this embodiment, the user can control the braking force of the braking member 13 without changing the core body 7 to one having a different material or hardness of the pen tip portion 72a. It is possible to control the hardness of the pen tip portion of the electronic pen 1 that can be felt. That is, by changing the braking member 13 to one having a different braking force, it is possible to realize an electronic pen that can obtain a feeling such as a difference in hardness of a pencil core.

  Further, as shown in FIG. 8, the position where the braking member 13 is fitted to the core body fitting member 14 to be braked can also be changed by changing the axial length of the unit case of the force receiving unit 10. Since it changes, it is possible to control the strength of the braking force applied to the core body fitting member 14 with respect to the lateral load. That is, it is possible to adjust the braking force of the braking member 13 with respect to the core body fitting member 14 by changing the components constituting the force receiving unit 10. Therefore, by changing the components constituting the force receiving unit 10, for example, it is possible to realize an electronic pen that can provide a feeling like a difference in hardness of a pencil lead.

  Further, when the fitting position of the core body 7 with the core body fitting member 14 is separated from the position of the diaphragm 1221 of the strain body 12 due to the design of the electronic pen, the bending moment due to the lateral load increases. For example, the axial lengths of the outer unit case 111 and the middle unit case 112 are increased, the thickness of the braking member 13 is increased, the number of slits is decreased, and the outer diameter is decreased. Thus, the braking force can be increased to cope with it.

  Next, FIG. 9 shows a configuration example of the electronic circuit of the electronic pen 1 of this embodiment. As shown in FIG. 9, in this example, the electronic circuit 5 includes a power supply circuit 51, a triaxial strain detection circuit 52, a writing pressure and inclination detection circuit 53, and a signal transmission circuit 54.

  The power supply circuit 51 generates a drive voltage (power supply voltage) Vcc for each circuit from the voltage of the battery 4, and uses the generated drive voltage as a triaxial strain detection circuit 52, a pen pressure / tilt detection circuit 53, and a signal transmission circuit. 54.

  The triaxial strain detection circuit 52 uses the strain sensing elements 62X1, 62X2, 62Y1, 62Y2, 62Z1, 62Z2, 62Z3, and 62Z4 of the strain gauge 60 to output X of the external force applied to the core 7 of the electronic pen 1. Strain is detected according to force components in the axial direction, the Y-axis direction, and the Z-axis direction, and the strain detection output in each direction is supplied to the writing pressure and inclination detection circuit 53.

  As a bridge circuit for detecting strain using a strain sensitive element, a one gauge method using only one strain sensitive element, a two gauge method using two strain sensitive elements, and four strain receiving elements. There is a 4-gauge method using a sensitive element.

  In the triaxial strain detection circuit 52 of this embodiment, the bridge circuit for detecting strain in the Z-axis direction is configured by a 4-gauge method using four strain sensitive elements 62Z1 to 62Z4. That is, the bridge circuit as a detection circuit for strain due to the force component in the Z-axis direction has a configuration of a 4-gauge bridge circuit as shown in FIG. In the strain gauge 60, as shown in FIG. 4, the strain sensitive element 62Z1 and the strain sensitive element 62Z2 receive strains in different directions, and the strain sensitive element 62Z3 and the strain sensitive element 62Z4 are mutually connected. The detection output obtained at the output terminals Za and Zb in FIG. 10 is four times the detection output of the bridge circuit configured using one strain sensing element because it is arranged at a position where it receives strain in different directions. The detection output of the magnitude of is obtained.

  In the triaxial strain detection circuit 52 of this embodiment, the bridge circuit for detecting the strain in the Y-axis direction includes two strain sensing elements 62Y1 and 62Y2, and two fixed resistors RY1 and RY2. And the two-gauge method as shown in FIG. In this case, as shown in FIG. 4, since the strain sensitive element 62Y1 and the strain sensitive element 62Y2 are arranged at positions that receive strains in different directions, the output terminals Ya and Yb in FIG. The detection output obtained in (1) is twice as large as the detection output of the bridge circuit configured by using one strain sensing element.

  In the triaxial strain detection circuit 52 of this embodiment, the bridge circuit for detecting the strain in the X-axis direction includes two strain sensing elements 62X1 and 62X2 and two fixed resistors RX1 and RX2. It is set as the structure of 2 gauge methods as shown in FIG. In this case, as shown in FIG. 4, since the strain sensitive element 62X1 and the strain sensitive element 62X2 are arranged at positions that receive strains in different directions, the output terminals Xa and Xb in FIG. The detection output obtained in (1) is twice as large as the detection output of the bridge circuit configured by using one strain sensing element.

  The writing pressure and inclination detection circuit 53 detects the writing pressure applied to the core 7 of the electronic pen 1 from the detection output of the strain in the Z-axis direction, and generates, for example, a digital signal corresponding to the detected writing pressure. Then, the signal is supplied to the signal transmission circuit 54. Further, the writing pressure and inclination detection circuit 53 detects the inclination angle with respect to the input surface of the sensor unit of the electronic pen 1 from the detection output of the distortion in the X-axis direction and the Y-axis direction, and according to the detected inclination angle. For example, a digital signal is generated and supplied to the signal transmission circuit 54.

  The signal transmission circuit 54 supplies a position detection signal to the sensor unit of the tablet-type information terminal through the signal transmission core 71 of the core body 7 in a capacitive manner, and as additional information of the position detection signal, A signal corresponding to a digital signal of writing pressure information and inclination angle information from the writing pressure and inclination detection circuit 53 is supplied.

  In the electronic pen 1 of this example, the digital signal of the pen pressure information and the inclination angle information is transmitted to the tablet information terminal as additional information of the position detection signal through the signal transmission core 71 of the core body 7. However, for example, a wireless communication unit of the Bluetooth (registered trademark) standard may be mounted on the electronic pen so as to perform wireless communication with the tablet information terminal separately from the position detection signal.

[Second Embodiment]
In the first embodiment described above, the force detection unit 6 is configured by the strain gauge 60 so that the force in the triaxial direction can be detected. However, the force detection unit is configured in the Z-axis direction ( You may comprise by the member which detects only the force of an axial direction), ie, a writing pressure. In the second embodiment described below, the force detection unit can change the capacitance according to the writing pressure as disclosed in, for example, Patent Document 2 (Japanese Patent Laid-Open No. 2013-161307) described above. The writing pressure detecting member 80 using a semiconductor element is used.

  FIG. 13 is a cross-sectional view for explaining a configuration example of a main part of the electronic pen 1A of the second embodiment, and is applied to a capacitance-type electronic pen as in the first embodiment described above. Is the case. In the example of FIG. 13, the same parts as those of the electronic pen 1 of the first embodiment shown in FIG. 2 are denoted by the same reference numerals, and detailed description thereof is omitted.

  The electronic pen 1A according to the second embodiment includes a force receiving unit 10A as shown in FIG. The unit case 11A of the force receiving unit 10A is similar to the unit case 11 of the force receiving unit 10 of the electronic pen 1 of the first embodiment, and includes an outer unit case 111, a middle unit case 112A, and a unit case holder 113. The configuration of the middle unit case 112A is different from that of the unit case 11 of the first embodiment.

  A slide member 17 is disposed in the hollow portion of the middle unit case 112A of the force receiving unit 10A of the electronic pen 1A of the second embodiment. The slide member 17 has a cylindrical shape having an outer diameter slightly smaller than the inner diameter of the middle unit case 112A. In this example, a conductive material, for example, a conductive metal or conductive powder is mixed. Made of hard resin. In addition, through holes 112Aa and 112Ab that engage with engaging protrusions 17a and 17b formed on the peripheral side surface of the columnar slide member 17 are provided in an intermediate portion in the axial direction of the middle unit case 112A. ing. The slide member 17 is slidable in the axial direction in the hollow of the middle unit case 112A by the length in the axial direction of the through holes 112Aa and 112Ab of the middle unit case 112A.

  On the pen point side in the axial direction of the slide member 17, a fitting recess 17 c is formed in which the opposite side of the pen point side of the core body fitting member 14 is fitted, and the signal transmission core of the core body 7 </ b> A is formed. A fitting recess 17d into which 71A is fitted is formed at the bottom of the fitting recess 17c. In this second embodiment, the signal transmission core 71 </ b> A of the core body 7 </ b> A is configured to have a length that protrudes from the end of the core body fitting member 14 opposite to the pen tip side.

  As shown in FIG. 13, in the electronic pen 1A according to the second embodiment, a writing pressure detecting member 80 is attached to the end surface on the pen tip side of the printed circuit board 16A, and the hollow of the middle unit case 112A. The writing pressure detecting member 80 is inserted into the section. The writing pressure detection member 80 is provided with a pressure sensing chip 90 made of a semiconductor element for detecting writing pressure.

  The slide member 17 is provided with a protrusion 17e that is fitted to the writing pressure detecting member 80 and transmits the writing pressure to the pressure sensing chip 90. The writing pressure detection member 80 is formed with a fitting hole 80a into which the protrusion 17e of the slide member 17 is fitted.

  A coil spring 18 is provided around the protrusion 17 e of the slide member 17. Therefore, in a state where the protrusion 17 e of the slide member 17 is fitted in the fitting hole 80 a of the writing pressure detection member 80, the coil spring 18 is interposed between the slide member 17 and the writing pressure detection member 80. The slide member 17 is always elastically biased toward the pen tip side.

  Next, the pen pressure (force component in the Z-axis direction) applied to the core body 7A can be detected on the end surface on the pen tip side in the longitudinal direction (axial direction of the casing 3) of the printed circuit board 16A. The writing pressure detection member 80 and the pressure sensing chip 90 attached in the state will be described.

  14A and 14B are diagrams for explaining the configuration of the writing pressure detecting member 80. FIG. 14A is a perspective view of the writing pressure detecting member 80, and FIG. 14B is a drawing of FIG. FIG. 14C is a longitudinal sectional view including the AA line, and shows a state in which the writing pressure detecting member 80 is attached to the printed circuit board 16A.

  In this example, the writing pressure detecting member 80 includes a pressure sensing chip 90 configured as a semiconductor chip manufactured by, for example, MEMS (Micro Electro Mechanical Systems) technology, sealed in a cubic or rectangular parallelepiped box-shaped package 81, for example. (See FIGS. 14A and 14B).

The pressure sensing chip 90 detects the applied pressure as a change in capacitance. In this example, the first electrode 91, the second electrode 92, the first electrode 91, and the second electrode are detected. And an insulating layer (dielectric layer) 93 between the electrodes 92. The pressure sensing chip 90 in this example receives pressure from the upper surface 91 a side of the first electrode 91. In this example, the first electrode 91 and the second electrode 92 are made of a conductor made of single crystal silicon (Si). In this example, the insulating layer 93 is composed of an insulating film made of an oxide film (SiO ₂ ).

  And in this example, the circular recessed part 94 centering on the center position of the said surface is formed in the surface side which opposes the 1st electrode 91 of the insulating layer 93. As shown in FIG. Due to the recess 94, a space is formed between the insulating layer 93 and the first electrode 91. In this example, the bottom surface of the recess 94 is a flat surface, and its diameter D is, for example, D = 1 mm. In addition, the depth of the concave portion 94 is about several tens of microns to several hundreds of microns in this example.

  Due to the presence of the space formed by the recess 94, the first electrode 91 is bent in the direction of the space formed by the recess 94 when pressed from the surface 91 a side opposite to the surface facing the second electrode 92. The electrostatic capacitance Cv formed between the first electrode 91 and the second electrode 92 changes according to the displacement generated in the first electrode 91 based on the pressing force.

  In the writing pressure detection member 80 of this embodiment, the pressure sensing chip 90 having the above-described configuration has a surface 91a of the first electrode 91 that receives pressure, as shown in FIGS. 14A and 14B. 81 is housed in the package 81 so as to face the upper surface 81a of the 81.

  In this example, the package 81 includes a package member 82 made of an electrically insulating material such as a ceramic material or a resin material, and an elastic member 83 provided in the package member 82 on the surface 91a side where the pressure sensing chip 90 receives pressure. It consists of. The elastic member 83 is a pressure transmission member having a predetermined elasticity. In this example, the elastic member 83 is made of a silicon resin having a predetermined elasticity, for example, silicon rubber.

  In the package 81, the above-described fitting hole 80a is formed so as to communicate from the upper surface 81a to a part of the elastic member 83. As shown by the dotted lines in FIGS. 14A and 14B, the protrusion 17e of the slide member 17 is fitted into the fitting hole 80a (see FIG. 13).

  14A and 14B, a first lead terminal 84 connected to the first electrode 91 of the pressure sensing chip 90 is led out from the package member 82 of the writing pressure detecting member 80. At the same time, the second lead terminal 85 connected to the second electrode 92 of the pressure sensing chip 90 is led out. The first lead terminal 84 is electrically connected to the first electrode 91 by, for example, a gold wire 84a. The second lead terminal 85 is electrically connected to the second electrode 92 by being led out in contact with the second electrode 92. Of course, the second lead terminal 85 and the second electrode 92 may be electrically connected by a gold wire or the like.

  In this example, as shown in FIGS. 14B and 14C, the package member 82 is electrically connected to the protrusion 17 e of the slide member 17 in a state of being electrically connected to the signal transmission core 71. A third lead terminal 86 configured to be connected to is derived.

  That is, in this example, a contact 87 made of a conductor is provided on the inner wall surface of the fitting hole 80a, and when the protruding portion 17e of the conductive slide member 17 is inserted into the fitting hole 80a. The contact 87 is electrically connected. The contact 87 is electrically connected to the third lead terminal 86 by a gold wire 86a.

  In this example, the first, second and third lead terminals 84, 85 and 86 are made of a conductor and are wide as shown in the figure. In this example, the first, second, and third lead terminals 84, 85, and 86 are led out from the bottom surface 81b facing the top surface 81a of the package 81 in a direction perpendicular to the bottom surface 81b. At the same time, the first and third lead terminals 84 and 86 and the second lead terminal 85 are spaced from each other at an interval corresponding to the thickness d of the printed board 16A on which the writing pressure detection member 80 is disposed. It is derived | led-out so that it may oppose in parallel.

  Then, as shown in FIG. 14C, the first and third lead terminals 84 with the writing pressure detecting member 80 in a state where the bottom surface 81b of the package 81 is in contact with the end surface 16Aa of the printed circuit board 16A. And 86 and the second lead terminal 85 (the second lead terminal 85 is not shown in FIG. 14C) so as to sandwich the thickness direction of the printed circuit board 16A. Note that a positioning projection 81c is provided on the bottom surface 81b of the package 81, and this projection 81c is fitted into a concave hole (not shown) provided in the end surface 16Aa of the printed circuit board 16A. The writing pressure detection member 80 is positioned with respect to the printed circuit board 16A.

  Then, the printed wiring patterns 161 and 162 provided on one surface of the printed board 16A, the first lead terminal 84 and the third lead terminal 86 are electrically connected and fixed by the solder 163 and 164. Although not shown, similarly, the printed wiring pattern provided on the surface opposite to the one surface of the printed board 16A and the second lead terminal 85 are fixed by soldering.

  In this example, although not shown, the printed circuit board 16A has a printed wiring pattern 163 to which the first lead terminal 84 is connected and a printed wiring pattern to which the second lead terminal 85 is connected. A signal processing circuit to which the printed wiring pattern 164 to which the third lead terminal 86 is connected is connected and a signal processing circuit to be connected are provided. The signal processing circuit detects the writing pressure from the electrostatic capacitance Cv of the pressure sensing chip 90 of the writing pressure detection member 80, supplies the detected writing pressure to the signal transmission circuit, and controls the signal transmission circuit. To do. The signal transmission circuit sends a position detection signal to a position detection sensor used together with the electronic pen 1A, and receives control of the signal processing circuit to obtain information on writing pressure from the signal processing circuit, for example, a core. Processing to send out through the body 7A is performed.

  In this state, as shown in FIGS. 13 and 14C, the brush member 17 is inserted through the slide member 17 into which the end portion 71Ab of the core 7A opposite to the pen tip side of the signal transmission core 71A is fitted. When a pressing force P is applied to the pressure detection member 80 in the axial direction, a pressure corresponding to the pressing force P is applied to the pressure sensing chip 90 via the elastic member 83. Then, the first electrode 91 of the pressure sensing chip 90 is deflected according to the applied pressure, and the capacitance Cv of the pressure sensing chip 90 changes according to the applied pressure. The signal processing circuit provided on the printed circuit board 16A performs signal processing according to the capacitance value of the electrostatic capacitance Cv.

  In the electronic pen 1A of the second embodiment, as in the first embodiment, the displacement in the direction perpendicular to the axial direction of the core body fitting member 14 is braked by the braking member 13, so that it is thin. The risk of damage to the core body fitting member 14 and the core body 7A can be reduced, and the influence of the braking member 13 is small in the axial direction (Z-axis direction). The pen pressure can be detected.

  Although the writing pressure detection member 80 is configured using a pressure sensing chip of a semiconductor element, the dielectric is mechanically described by two electrodes as described in Patent Document 1 (Japanese Patent Application Laid-Open No. 2011-186803). It is also possible to use a variable capacitance capacitor having a configuration in which the capacitance between the two electrodes changes depending on the pinching and writing pressure.

[Third Embodiment]
In the first and second embodiments described above, the electronic pen is of the electrostatic coupling type, but the present invention can also be applied to an electromagnetic induction type electronic pen. FIG. 15 is a diagram for explaining a configuration example of a main part of the electronic pen 1B according to the third embodiment of the electromagnetic induction method, and shows one of the axial directions (Z-axis direction) of the cylindrical housing 3B. It is sectional drawing by the side of an opening.

  In the electronic pen 1B of the third embodiment, as shown in FIG. 15, a substrate holder 301 is provided in the housing 3B in a state in which it cannot move in the axial direction within the hollow portion of the housing 3B. The printed circuit board 16 </ b> B is mounted on the substrate mounting portion of the substrate holder 301. In this case, the printed circuit board 16B is set to a central position in the hollow portion of the housing 3B. That is, the printed circuit board 16B is disposed such that the center position of the cross section thereof coincides with the center line position of the cylindrical hollow section of the housing 3B.

  As shown in FIG. 15, a pressure sensing chip 90 is used on the end surface on the pen tip side in the longitudinal direction of the printed circuit board 16B (axial direction of the housing 3B), as in the second embodiment. The writing pressure detection member 80B is attached in a state where the writing pressure (force component in the Z-axis direction) applied to the core body 7B can be detected.

  The writing pressure detection member 80B of this example has a configuration in which the third lead terminal 86, the contact 87, and the gold wire 86a connecting them are removed from the writing pressure detection member 80 shown in FIG. This is because the electronic pen 1B according to the third embodiment is an electromagnetic induction method, and thus it is not necessary to supply a signal from the electronic circuit of the printed board 16B to the core body 7B.

  The force receiving part in the third embodiment includes a core body fitting member 14B, a strain body part 12B coupled to the core body fitting member 14B, a braking member 13B, and a writing pressure transmission member 17B. However, in the third embodiment, the force receiving unit is not configured as a unit. In the third embodiment, the force detection unit includes not only the writing pressure detection member 80B but also a strain gauge 60B attached to the strain body 12B as described later. The strain gauge 60B detects strain due to forces in the X-axis direction and the Y-axis direction orthogonal to the axial direction. Therefore, in the third embodiment, it is possible to detect force components in the triaxial direction for the force applied to the core body 7B.

  The core body fitting member 14B is configured by an elongated cylindrical body made of metal, for example, as in the first and second embodiments described above. An electromagnetic induction core 7B is fitted to the pen tip side of the core fitting member 14B, and a writing pressure transmission member 17B is fitted to the side opposite to the pen tip side. .

  The core body 7B in the electronic pen 1B of the third embodiment is configured by removing the signal transmission core 71 of the core body 7 for the electrostatic coupling type electronic pen and only the portion of the pen tip protection member 72. It has the same configuration as. That is, the core body 7B is made of, for example, a hard resin material, and includes a pen tip part 7Ba and a fitting part 7Bb inserted into the hollow part 14Ba of the core body fitting member 14B. The nib portion 7Ba has a conical shape with a rounded top, and a step portion 7Bc having a slightly larger diameter than the fitting portion 7Bb is provided on the bottom surface side of the conical shape.

  As shown in FIG. 15, the core body 7B is coupled and mounted to the core body fitting member 14B by press-fitting the fitting portion 7Bb into the core body fitting member 14B. However, by strongly pulling the core body 7B, it can be easily detached from the core body fitting member 14B.

  The writing pressure transmission member 17B is made of, for example, hard resin, and includes a fitting portion 17Ba that is fitted into the hollow portion 14Ba of the core body fitting member 14B, and is fitted into the fitting hole 80a of the writing pressure detection member 80B. The pressing projection 17Bb is provided.

  In this state, when a pressure is applied to the pen tip portion 7Ba of the core body 7B, the core body 7B and the core body fitting member 14B are integrally displaced with respect to the applied pressure. Pressure is transmitted to the pressure sensing chip 90 of the writing pressure detecting member 80B by the pressing protrusion 17Bb of the writing pressure transmitting member 17B on the other end side in the axial direction of the member 14B, and the writing pressure is detected as a change in capacitance. Is done. The detected writing pressure information is transmitted from the electronic pen 1B of this embodiment to an electromagnetic induction type position detecting device by electromagnetic coupling in this example.

  In this example, the strain body 12B is a hard material having elasticity, and is made of a material different from the core body fitting member 14B, for example, a resin. In this example, as shown in FIG. The hollow body 12Ba has a cylindrical shape that partially houses the core body fitting member 14B. In this example, PEEK (Poly Ether Ether Ketone) is used as the resin material constituting the strain generating body portion 12B.

  In this example, the strain body 12B has one end side in the axial direction (the same side as the one end side in the axial direction of the core body fitting member 14B) in the axial direction of the core body fitting member 14B. While being coupled to the core body fitting member 14B at an intermediate position between the one end and the other end, on the other end side in the axial direction, the cylindrical inner wall surface 12Bb of the strain generating body portion 12B is fitted to the core body. It is configured to be separated from the side peripheral surface 14Bb of the combined member 14B. In this example, as will be described later, the strain generating body portion 12B has the core as much as possible so that the bending moment applied to the core body fitting member 14B can be suppressed as much as possible by the force applied to the core body fitting member 14B. The body fitting member 14B is coupled to the core body fitting member 14B at a position closer to one end side. That is, the strain body 12B also serves as a braking member against displacement in a direction perpendicular to the axial direction of the core fitting member 14B.

  The inner diameter of one end side in the axial center direction of the cylindrical strain-generating body portion 12B is configured to be equal to the outer diameter of the core body fitting member 14B for coupling with the core body fitting member 14B. . The axial length of the portion 12Bc in which the inner diameter on one end side of the strain generating body portion 12B is made equal to the outer diameter of the core body fitting member 14B is set to a predetermined length. The length portion 12Bc is joined to the outer peripheral surface of the core body fitting member 14B, and the strain body 12B is joined to the core body fitting member 14B. Hereinafter, the predetermined length portion 12Bc in the axial direction of the strain body portion 12B is referred to as a coupling portion 12Bc.

  The position of the coupling portion 12Bc in the axial direction is a shape in which the pen tip side of the electronic pen 1B of this embodiment is tapered toward the tip side. 14B is an intermediate position in the axial direction. For this reason, as for the core body fitting member 14B, the pen point side rather than the coupling | bond part 12Bc is not covered with the strain body part 12B, but is exposed outside. In this embodiment, as will be described later, the brake member 13B is configured to be fitted to the pen tip side portion of the core body fitting member 14B exposed to the outside. In this example, the brake member 13B has the same configuration as the brake member 13 of the first and second embodiments shown in FIG. 5, and the core body is formed in the through-fitting hole 13Ba of the brake member 13B. The fitting member 14B is penetrated and fitted, and also in this example, it has isotropic braking characteristics.

  In this example, at the other end side in the axial direction of the strain generating body portion 12B, the inner diameter of the cylindrical shape is made larger than the outer diameter of the core body fitting member 14B. A space is formed between the inner wall surface 12Bb on the other end side of the strain generating body portion 12B and the side peripheral surface 14Bb on the other end side of the core body fitting member 14B. In this example, the other end side in the axial direction of the strain body 12B is a cylindrical portion whose inner diameter is larger than the outer diameter of the core body fitting member 14B and whose outer diameter is constant at a predetermined diameter. 12 Bd.

  As shown in FIG. 15, a concave hole 301a for fitting the cylindrical portion 12Bd of the strain generating body portion 12B is provided on the pen tip side of the substrate holder portion 301 housed in the housing 3B. . Then, as shown in FIG. 15, the cylindrical portion 12Bd of the strain body portion 12B is fitted into the recessed hole 301a of the substrate holder portion 301, so that the strain body portion 12B is placed inside the hollow portion of the housing 3B. In FIG. 2, the locking is performed so as not to move in any of the X axis direction, the Y axis direction, and the Z axis direction. Hereinafter, the cylindrical portion 12Bd on the other end side in the axial direction of the strain generating body portion 12B is referred to as a locking portion 12Bd.

  A portion between the coupling portion 12Bc and the locking portion 12Bd of the strain generating body portion 12B is an inclined side surface portion 12Be that gradually taper from the locking portion 12Bd side to the coupling portion 12Bc side. Yes. In this embodiment, the inclined side surface portion 12Be is used as a strain generating portion as will be described later. Therefore, in this example, the strain body portion 12B is configured in a truncated cone shape having an outer shape that tapers from the other end side toward the coupling portion 12Bc with the core body fitting member 14B in the axial direction. Yes.

  The thickness of the strain body portion 12B may be the same for the coupling portion 12Bc, the locking portion 12Bd, and the inclined side surface portion 12Be. In this example, as shown in FIG. 15, the thickness of the locking portion 12Bd is used. Is slightly thicker than the other parts. The inclined side surface portion 12Be is also used as a strain generating portion in this example, and therefore may be thinner than the coupling portion 12Bc.

  In the electronic pen 1B of this embodiment, the locking portion 12Bd of the strain generating body portion 12B is locked so as not to move in the X-axis direction, the Y-axis direction, and the Z-axis direction. The inclined side surface portion 12Be generates strain as displacement in the X-axis direction, the Y-axis direction, and the Z-axis direction based on the stress corresponding to the applied force.

  Therefore, in this embodiment, the X of the force applied to the pen tip portion 7Ba of the core body 7B is detected by detecting the strain generated in the X axis direction and the Y axis direction on the inclined side surface portion 12Be of the strain body portion 12B. The force components in the axial direction and the Y-axis direction are detected.

  In this case, the force component in the X-axis direction and the Y-axis direction of the force applied to the pen tip portion 7Ba of the core body 7B acts as a bending moment on the core body 7B and the core body fitting member 14B. Strain corresponding to the bending stress is generated in the inclined side surface portion 12Be of the strain generating body portion 12B. In this example, as shown in FIGS. 16A and 16B, a displacement receiver that detects displacement in the X-axis direction and the Y-axis direction in the vicinity of the coupling portion 12Bc of the inclined side surface portion 12Be of the strain-generating body portion 12B. As the sensing elements, four strain sensing elements X1 to X4 and Y1 to Y4 are provided so as to be arranged in the circumferential direction. In this case, each of the strain sensitive elements X1 to X4 and Y1 to Y4 is a strain sensitive element that changes its resistance value in accordance with the expansion and contraction in the direction orthogonal to the axial direction in the inclined side surface portion 12Be. ing.

  In this case, the set of the strain sensitive elements X1 and X2 and the set of the strain sensitive elements X3 and X4 are separated from each other by 180 degrees, and the set of the strain sensitive elements Y1 and Y2 and the strain sensitive element. The set of Y3 and Y4 is disposed so as to be 180 degrees apart from each other. The positions separated by an angular interval of 180 degrees are positions where tensile strain is generated on one side and compressive strain is generated on the other side due to bending stress due to force components in the X-axis direction and Y-axis direction.

  FIG. 16C shows an example of the strain detection circuit 310 configured using the strain sensing elements X1 to X4 and Y1 to Y4 arranged as described above. In the strain detection circuit 310 of this example, as shown in FIG. 16C, a 4-gauge bridge circuit (Wheatstone bridge circuit) is formed as a circuit for detecting strain in each of the X-axis direction and the Y-axis direction. Has been configured.

  The strain detection circuit 310 is formed on the printed circuit board 16B, and the tilt angle and rotation of the electronic pen 1B are detected by the force components in the X-axis direction and the Y-axis direction detected by the strain detection circuit 310. Then, the detected tilt angle information and rotation information are transmitted as an electromagnetic induction coupling signal from the electronic pen 1B in the same manner as the writing pressure information detected by the writing pressure detection member 80B.

  Similarly to the electronic pen 1 of the first embodiment, in the electronic pen 1B of the third embodiment, the pen pressure information, the inclination angle information, and the rotation information are wirelessly transmitted according to the Bluetooth (registered trademark) standard or the like. You may make it transmit using a means.

  In order to detect strain in the X-axis direction and in the Y-axis direction, the four strain-sensitive elements X1 to X4 and the four strain-sensitive elements Y1 to Y4 are not used. The strain-sensitive elements in the axial direction and the Y-axis direction may be arranged one by one or two by two in the circumferential direction of the inclined side surface portion 12Be.

  In the electronic pen 1B of this embodiment, the cover body 302 that covers the periphery of the strain generating body portion 12B is fitted into the substrate holder portion 301 in the axial direction in the hollow portion of the housing 3B. Is provided. A screw portion 3Ba is formed on the opening side of the core 7B of the housing 3B on the pen tip portion 7Ba side, and the front portion coupled to the opening side of the housing 3B is screwed into the screw portion 3Ba. A cap portion 8B is provided.

  The front cap portion 8B has an opening 8Ba on the pen tip portion 7Ba side of the core body 7B, and has a truncated cone shape that tapers toward the opening 8Ba. The opening 8Ba of the front cap portion 8B has a diameter larger than the outer diameter of the step portion 7Bc of the pen tip portion 7Ba of the core body 7B. The diameter of the opening 8Ba of the front cap portion 8B is such that when the core body 7B receives a large force in the X-axis direction and the Y-axis direction, the stepped portion 7Bc and the end surface of the opening 8Ba of the front cap portion 8B abut each other. Thus, the core body 7B is selected so that it functions as a stopper and the core body 7B is protected even if impact loads in the X-axis direction and the Y-axis direction are applied to the core body 7B.

  That is, the diameter of the opening 8Ba of the front cap portion 8B is such that when the stress due to the forces in the X-axis direction and the Y-axis direction is a predetermined stress within the elastic region of the core body 7B, the step portion 7Bc of the core body 7B and the opening 8Ba. The value is selected so that it matches the end face.

  And as shown in FIG. 15, the braking member 13B is attached so that it may be fixed in the hollow part of the front cap part 8B. The front cap portion 8B constitutes a part of the housing of the electronic pen 1B, but is present at the most pen point side, so the braking member 13B is the most core member 7B of the core body fitting member 14B. The core body fitting member 14B can be braked at a portion close to the pen tip portion 7Ba.

  In this example, as shown in FIG. 15, the pen point portion 7Ba side of the core body 7B of the cover body 302 is tapered according to the shape of the front cap portion 8B. Around the cover body 302, a coil 303 constituting a resonance circuit that transmits and receives electromagnetic induction signals is wound. The cover body 302 is a magnetic core around which the coil 303 is wound, and is made of, for example, ferrite. In the electronic pen 1B, a capacitor is connected in parallel to the coil 303 to form a parallel resonance circuit.

The electronic pen 1B according to the third embodiment transmits and receives a position detection signal by electromagnetically coupling with a sensor conductor of the position detection device via a parallel resonance circuit, and is detected through the writing pressure detection member 80B. The pen pressure information and the tilt angle and rotation information of the electronic pen 1B detected from the output of the strain detection circuit 310 are transmitted to the position detection device.

  In the position detection device, an induced voltage is generated by an electromagnetic induction signal transmitted from the electronic pen 1B to the conductor of the sensor. Therefore, based on the level of the voltage value of the induced voltage, the position detection device in the X-axis direction and the Y-axis direction The coordinate value of the indicated position is calculated. In addition, the position detection device performs processing for receiving additional information such as writing pressure data from the electronic pen 1B and information on the tilt angle and rotation of the electronic pen 1B, and detects the writing pressure applied to the electronic pen 1B. The tilt angle and the rotation angle of the electronic pen 1B are detected.

  Also in the electronic pen 1B of the third embodiment configured as described above, similarly to the above-described embodiment, the displacement of the core body fitting member 14B in the direction orthogonal to the axial direction is caused by the braking member 13B. Since braking is performed, the risk of damage to the core body 7B and the core body fitting member 14B can be reduced.

  In addition, in the electronic pen 1B of the third embodiment, the strain body 12B is configured to be coupled at an intermediate portion in the axial direction of the core body fitting member 14B, and the strain body 12B is also a core body. Since the displacement in the direction orthogonal to the axial direction of the fitting member 14B is braked, it is possible to more firmly take measures against damage to the core body 7B and the core body fitting member 14B. That is, in the electronic pen 1B of the third embodiment, the core body fitting member 14B is braked by the braking members (the braking member 13B and the strain body 12B) at two positions in the axial direction. Therefore, the braking against the bending moment can be made stronger.

  According to the electronic pen 1B of the third embodiment, since the bending moment in the X-axis direction and the Y-axis direction with respect to the core body fitting member 14B can be suppressed, the core body fitting member 14B and the core body can be suppressed. 7B can be prevented, and the stress based on the force component in the Z-axis direction and the stress based on the force component in the X-axis direction and the Y-axis direction can be detected in a well-balanced manner.

  In the third embodiment, as described above, the braking member is used by the braking member 13B and the two strain generating body portions 12B. However, the braking member 13B is omitted, and the strain generating member Only the braking member function of the body 12B may be used. Needless to say, the braking member function of the strain generating body portion 12B is also applicable to the electronic pen 1 and the electronic pen 1A of the first and second embodiments.

  In the electronic pen 1B according to the third embodiment described above, the force component in the Z-axis direction among the forces applied to the core body 7B is detected by the writing pressure detection member 80B. A strain sensitive element for detecting strain in the Z-axis direction may be provided on the inclined side surface portion 12Be of 12B, and a force component in the Z-axis direction may also be detected by a strain gauge.

  In the third embodiment, instead of the core body 7B, the core body 7A or the core body 7A of the first embodiment or the second embodiment described above is used, so that the electrostatic coupling type electronic pen can be used. It can also be easily configured.

  The writing pressure detection member 80B is configured using a pressure sensing chip of a semiconductor element. However, the dielectric is mechanically described as two electrodes described in Patent Document 1 (Japanese Patent Laid-Open No. 2011-186803). It is also possible to use a capacitance variable capacitor having a configuration in which the capacitance between the two electrodes changes according to the writing pressure.

[Other Embodiments or Modifications]
<Other examples of braking members 13 and 13B>
As a separate body from the core body fitting members 14 and 14B, the core body fitting members 14 and 14B are fitted to the core body fitting members 14 and 14B, thereby braking against displacement in a direction perpendicular to the axial direction of the core body fitting members 14 and 14B. The braking members 13 and 13B that perform the operation are not limited to the configuration in which the arc-shaped slits as shown in FIG. 5 are formed in a disk-shaped thin plate.

  FIGS. 17-21 is a figure which shows the other structural example of the braking member which consists of a metal disk-shaped thin plate like the braking members 13 and 13B of the above-mentioned example, for example.

  A braking member 131 shown in FIG. 17 (A) is provided with a through-fitting hole 131a for fitting with the core body fitting member 14 or the core body fitting member 14B at the center of the disk-shaped thin plate, and has a disk shape. The thin plate is equally divided into a plurality of portions in the circumferential direction. In this example, the thin plate is divided into four, and slits 131b are formed in a zigzag shape on each of the fan-shaped plate portions corresponding to the 90-degree angle range of each divided region. In this braking member 131, the core body fitting member 14 is changed by changing the thickness of the disk-shaped thin plate, the number of divisions in the circumferential direction of the disk-shaped thin plate, the width and the formation pitch of the zigzag slit 131b, and the like. , 14B can be adjusted in the direction orthogonal to the axial direction.

  The braking member 132 shown in FIG. 17 (B) is similar to the braking member 131 in the example of FIG. 17 (A), with the core body fitting member 14 or the core body fitting member 14B at the center of the disk-shaped thin plate. The through-fitting hole 132a to be fitted is provided, and the disk-shaped thin plate is equally divided into a plurality of parts in the circumferential direction, in this example, four. In the braking member 132, arc-shaped slits 132b are formed for each of the fan-shaped plate portions corresponding to the 90-degree angle range of each divided region. In this braking member 132, by changing the thickness of the disk-shaped thin plate, the number of divisions in the circumferential direction of the disk-shaped thin plate, the width and number of the respective slits 132b of the sector-shaped plate portion of each divided region The braking force in the direction orthogonal to the axial direction of the core body fitting members 14 and 14B can be adjusted.

  A braking member 133 shown in FIG. 17C is provided with a through-fitting hole 133a for fitting with the core body fitting member 14 or the core body fitting member 14B at the center of the disk-shaped thin plate. A spiral slit 133b centered on the joint hole 133a is formed. In the braking member 133, the thickness of the disk-shaped thin plate, the width of the spiral slit 133b, the number of times of spiral winding, and the like are changed to control the braking member 133 in the direction orthogonal to the axial direction of the core body fitting members 14 and 14B. The power can be adjusted.

  The braking member 134 shown in FIG. 17D is provided with a through-fitting hole 134a that fits with the core body fitting member 14 or the core body fitting member 14B at the center of the disk-shaped thin plate, and also has a disk shape. A plurality of protrusions 134b are radially formed between a predetermined radial position and an outer peripheral radial position of the thin plate. In the braking member 134, the thickness of the disk-shaped thin plate, the radial position of the protrusion starting point of the plurality of protrusions 134b formed radially, the width and number of the plurality of protrusions 134b, and the like are changed, thereby changing the core body fitting. The braking force in the direction orthogonal to the axial direction of the combined members 14 and 14B can be adjusted.

  Moreover, the braking member 135 shown in FIGS. 18A and 18B has a through-fitting hole 135a for fitting with the core body fitting member 14 or the core body fitting member 14B at the center of the disk-shaped thin plate. While being provided, the disk-shaped thin plate is configured to wave in the radial direction. In the braking member 135, the braking force in the direction orthogonal to the axial direction of the core body fitting members 14 and 14B is adjusted by changing the thickness of the disk-shaped thin plate, the pitch of the waveform in the radial direction, and the like. be able to.

  Further, the disk-shaped thin plate constituting the braking member does not need to have a uniform thickness. For example, as shown in FIGS. 19A and 19B, the fixed periphery is thicker than the other parts. You may make it do. That is, the braking member 136 shown in FIG. 19A is provided with a through-fitting hole 136a that fits with the core body fitting member 14 or the core body fitting member 14B at the center of the disk-shaped thin plate, and a peripheral edge. 136b is a thin portion having a plate thickness d1, and a portion 136c from the through-fitting hole 136a to the peripheral edge 136b is a thin portion having a plate thickness d2 which is thinner than the peripheral edge 136b.

  In this braking member 136, by changing the plate thickness d2 of the thin portion 136c from the through-fitting hole 136a to the peripheral edge 136b, the braking force in the direction perpendicular to the axial direction of the core body fitting members 14, 14B is increased. Can be adjusted.

  In addition, the braking member 137 shown in FIG. 19B is provided with a through-fitting hole 137a that fits with the core body fitting member 14 or the core body fitting member 14B at the center of the disk-shaped thin plate, and is penetrated. The plate thickness of the portion 137c from the fitting hole 137a to the peripheral edge 137b is changed to a thin plate thickness d3 in the vicinity of the through-fitting hole 137a and is gradually increased as it approaches the peripheral edge 137b. In this example, the thickness of the peripheral edge 137b is d4 (> d3).

  In the braking member 136 and the braking member 137 shown in FIGS. 19A and 19B, the portion 136c from the through-fitting hole 136a to the peripheral edge 136b and the portion 137c from the through-fitting hole 137a to the peripheral edge 137b are described above. Of course, it is also possible to form a slit as in the above example.

  The braking member of the above embodiment has uniform braking characteristics with respect to the radial force that intersects the axial direction of the core body fitting members 14 and 14B around the through-fitting hole, that is, isotropic. However, it has a non-uniform braking characteristic with respect to a radial force intersecting the axial direction of the core body fitting members 14 and 14B, that is, an anisotropic braking characteristic. It can also be configured.

  A braking member 138 shown in FIG. 20A is a first example of a braking member having anisotropic braking characteristics. The braking member 138 is provided with a through-fitting hole 138a for fitting with the core body fitting member 14 or the core body fitting member 14B at the center of the disk-shaped thin plate, and for example, X shown in FIG. Arc-shaped slits 138x and 138y that intersect the axial direction and the Y-axis direction are provided.

  In the braking member 138 of this example, as shown in FIG. 20A, the arc-shaped slits 138x formed on both sides of the through hole 138a in the X-axis direction are points with respect to the center of the through fitting hole 138a. It is formed to be in the target state. On the other hand, in this example, the arc-shaped slits 138y formed on both sides of the through-fitting hole 138a in the Y-axis direction are three arc-shaped slits 138y above the Y-axis direction in FIG. However, one arc-shaped slit 138y is formed below the Y-axis direction so as to be non-target.

  The braking member 138 in this example is a force in the Y-axis direction applied to the core body fitting members 14 and 14B in FIG. 20A, and is a force against a force directed downward from the through-fitting hole 138a. Only the power is weakened. Therefore, by using the braking member 138 of this example, an electronic pen can be realized in which the user can feel the same feeling as when writing with the fountain pen nib 7G as shown in FIG. Can do.

  When attaching the braking member 138 of this example to the electronic pen, it is necessary to match the Y-axis direction with the direction of the pen tip 7G. As a mark for aligning the direction, a small hole 138b is formed at a predetermined position in the braking member 138 of this example as shown in the drawing. In the electronic pen using the braking member 138, a small hole 138b of the braking member 138 is formed in the step 111e of the outer unit case 111 or the end surface of the middle unit case 112 of the force receiving unit 10 of the first embodiment. And a protrusion for matching the orientation. It should be noted that a protrusion is provided in the braking member 138 instead of the small hole 138b, and a recess in which the protrusion is fitted is provided in the step 111e of the outer unit case 111 of the force receiving unit 10 or the end surface of the middle unit case 112. It may be. The small holes 138b or protrusions provided in the braking member 138 may be one instead of a plurality as shown in the example of FIG.

  Next, a braking member 139 shown in FIG. 20C is a second example of a braking member having anisotropic braking characteristics. The braking member 139 is provided with a through-fitting hole 139a for fitting with the core body fitting member 14 or the core body fitting member 14B at the center of the disk-shaped thin plate, and for example, X shown in FIG. Arc-shaped slits 139x and 139y are provided so as to intersect the axial direction and the Y-axis direction.

  In the braking member 139 of this example, as shown in FIG. 20C, the arc-shaped slit 139x formed on both sides of the through-fitting hole 139a in the X-axis direction and the through-fitting hole in the Y-axis direction. Each of the arc-shaped slits 139y formed on both sides of 139a is formed so as to be pointed with respect to the center of the through-fitting hole 139a, but in the X-axis direction and the Y-axis direction, It is comprised so that braking force may differ.

  That is, in the braking member 139 of this example, one arc-shaped slit 139y is formed on both sides of the through-fitting hole 139a in the Y-axis direction, and the through-fitting hole 139a is formed in the X-axis direction. A plurality of arcuate slits 138x are formed on both sides, in this example, three arcuate slits 138x.

  Therefore, in the braking member 139 of this example, the braking force for the force in the X-axis direction applied to the core body fitting members 14 and 14B is weaker than the braking force for the force in the Y-axis direction in FIG. Become. Therefore, by using the braking member 139 of this example, an electronic device that allows the user to feel the same feeling as when the flat brush 7H of the paint brush as shown in FIG. 20D is moved in the X-axis direction. A pen can be realized.

  Even when the braking member 139 of this example is attached to the electronic pen, the X-axis direction needs to be aligned with the direction of the flat brush 7H. Therefore, the braking member 139 of this example has a small size as a mark for aligning the direction. A hole 139b is formed at a predetermined position as shown in the figure. Also in the braking member 139 of this example, the mark may be a protrusion instead of the small hole 139b, and the small hole 139b or the protrusion provided as the mark is not a plurality as shown in the example of FIG. There may be one.

  Needless to say, the braking member having anisotropy in the braking characteristics is not limited to the one using the arc-shaped slit as in the first and second examples. The example shown in FIG. 20E is a braking member 136A that has anisotropy by controlling the thickness of the disk-shaped thin plate.

  The braking member 136A of this example is a modified example of the braking member 136 shown in FIG. 19A having isotropic braking characteristics. That is, in the braking member 136 having the isotropic braking characteristic shown in FIG. 19A, the thin portion 136c around the through-fitting hole 136a is a length from the center of the through-fitting hole 136a to the peripheral edge 136b. Has a certain circular shape.

  On the other hand, the thin portion 136Ac around the through-fitting hole 136Aa of the braking member 136A in the example of FIG. 20E has a length from the center of the through-fitting hole 136Aa to the peripheral edge 136Ab. Of the radial directions from the center of the hole 136Aa, the direction in which the braking force is desired to be stronger than the other directions is shortened as shown in FIG. Therefore, in the braking member 136A, in the direction portion where the braking force is desired to be increased, the width of the peripheral edge 136b having a large thickness d1 is widened.

  That is, in the thin portion 136Ac, the width of the peripheral edge 136b having a large plate thickness is wide in the direction in which the length from the center of the through-fitting hole 136Aa to the peripheral edge 136Ab is shorter than the other direction part. In the braking member 136A, the braking force in this direction can be increased.

  The above examples are all examples in which only the braking force against the lateral load in the direction orthogonal to the axial direction of the core body fitting members 14 and 14B is focused. However, by devising the configuration of the braking member, it is possible to consider the stroke in the axial center direction (Z-axis direction) of the core body fitting members 14 and 14B and eventually the core bodies 7 and 7B.

  The braking member 130A in the example of FIG. 21 (A) and the braking member 130B in the example of FIG. 21 (B) have the core body fitting members 14, 14B, and thus the axial direction (Z of the core bodies 7, 7A, 7B). This is an example of the configuration of the braking member when the stroke in the axial direction is also taken into account, and in order to fit the core body fitting members 14 and 14B at the center position of the disk-shaped thin plate, similarly to the example of the braking member described above. And a through-fitting hole 130 </ b> Aa and a through-fitting hole 130 </ b> Ba, and a slit pattern that is relatively easily displaceable also in the axial direction (Z-axis direction) of the core bodies 7, 7 </ b> A, 7 </ b> B.

  In addition, as a braking member that brakes displacement in a direction orthogonal to the axial direction of the core body fitting member, in the above-described example, the braking members 13 and 13B of the first to third embodiments and the above-described modification examples are used. Although the configuration of the strain generating body portion 12B has been exemplified, the configuration is not limited to these examples.

  FIG. 22 shows still another configuration example of the braking member. In this example, as shown in FIG. 22, a ring-shaped braking member 13 </ b> C that fits with the core body fitting member 14 </ b> C is provided in the opening on the pen tip side of the front cap portion 8 </ b> C of the electronic pen. The braking member 13C of this example is configured to have a function of a bearing member for the core body fitting member 14C as described below.

  In the case of this example, the core body fitting member 14C has an end surface on the pen tip side that is the same surface as the front end surface of the front cap portion 8C, or slightly more than the front end surface of the front cap portion 8C. It is set as the structure which protrudes. Then, the braking member 13C is fitted to the core body fitting member 14C in a state where the space between the inner wall surface of the opening of the front cap portion 8C and the side peripheral surface of the core body fitting member 14C is filled. The In this example, the braking member 13C is configured not to protrude from the front end surface of the front cap portion 8C. However, when the front end face of the front cap portion 8C protrudes from the front end face of the front cap portion 8C, the braking member 13C may also protrude from the front end portion of the front cap portion 8C.

  In this case, at least an inner wall surface of the braking member 13C that is fitted with the core body fitting member 14C is coated with a coating layer having a small friction coefficient so that the core body fitting member 14C can move in the Z-axis direction. Has been. In this example, Teflon (registered trademark) processing is applied to the inner wall surface to be fitted to the core body fitting member 14C. Therefore, almost no braking is performed by the braking member 13C against the displacement of the core body fitting member 14C in the axial direction. However, the brake in the direction orthogonal to the axial direction of the core body fitting member 14C is braked by the braking member 13C. In addition, in this example, the braking member 13C is fitted to the core body fitting member 14C at a position closest to the fitting portion of the core body 7C of the core body fitting member 14C. Works more effectively.

  In the example of FIG. 22, the core body 7 </ b> C is configured as a core body of a capacitive coupling type electronic pen as in the first embodiment, and the pen tip side of the signal transmission core 71 </ b> C is the pen tip side. It is configured to be covered with a protective member 72C. However, the configuration of the example of FIG. 22 can also be applied to the electromagnetic induction type electronic pen of the third embodiment, and in that case, the core body has the same configuration as the core body 7B shown in FIG. It can be.

  Note that the ring-shaped braking member 13C in the example of FIG. 22 can be combined with the above-described disk-shaped thin plate braking members 13 and 13B and the above-described modifications. That is, the ring-shaped braking member 13C is arranged in the braking members 13 and 13B, the center through-fitting holes 13a and 13Ba of the modified example described above, and the like.

  In the above-described embodiment, the braking member is fitted in the through-fitting hole as a separate member from the core body fitting member, but is formed integrally with the core body fitting member. You may comprise as follows.

DESCRIPTION OF SYMBOLS 1,1A, 1B ... Electronic pen, 3 ... Case, 6 ... Force detection part, 7, 7A, 7B ... Core body, 8, 8B, 8C ... Front cap part, 10 ... Force reception unit, 11 ... Unit case, 12, 12B: strain body portion, 13, 13B, 13C, 130A, 130B, 131-139 ... braking member, 14, 14B, 14C ... core body fitting member, 16, 16A, 16B ... printed circuit board, 80 ... writing brush Pressure detecting member, 90 ... pressure sensing chip

Claims (16)

A cylindrical housing, a core body provided so that a tip projects from an opening on one end side in the axial direction of the cylindrical housing, and the core body housed in the cylindrical housing An electronic pen provided with a force detector for detecting the force applied to
A core body fitting member that is fitted to the core body and transmits a force applied to the core body to the force detector in the axial direction of the cylindrical housing;
A braking member that brakes the movement of the core body fitting member in a direction intersecting the axial direction;
With
The braking member is provided at a position closer to a distal end side of the core body of the core body fitting member than an existing position of the force detection portion in an axial direction of the cylindrical casing. Electronic pen to do. 2. The electronic pen according to claim 1, wherein the force detection unit is a sensor that detects at least the force in the axial direction of the force applied to the tip of the core body. 2. The electron according to claim 1, wherein the force detection unit is a sensor that detects a force in a direction orthogonal to the axial direction in at least a force applied to the tip of the core body. pen. The core body provided so that the tip protrudes from the opening on the one end side in the axial direction of the cylindrical casing includes a tip portion protruding from the cylindrical casing and a core body fitting member The electronic pen according to claim 1, further comprising: a fitting portion that is fitted to the force detection portion and transmits the force applied to the tip portion to the force detection portion. The said braking member is provided with the penetration fitting hole which the said core body fitting member penetrates and fits while being comprised by the member different from the said core body fitting member. Electronic pen. The brake member is a plate-like body, and has a uniform braking characteristic with respect to a radial force that intersects the axial direction with the center position of the through-fitting hole as a center. 5. The electronic pen according to 5. The braking member is a plate-like body, and has a nonuniform braking characteristic according to a difference in a radial direction intersecting the axial direction with a center position of the through-fitting hole as a center. Item 6. The electronic pen according to Item 5. The braking member is characterized in that a braking characteristic in a specific direction in a radial direction intersecting the axial direction centering on a center position of the through-fitting hole is different from braking characteristics in other directions. The electronic pen according to claim 7. The electronic pen according to claim 5, wherein the braking member is a plate-like body, and includes a plurality of arc-shaped slits in a circumferential direction centering on a center position of the through-fitting hole. . The braking member is a plate-like body, and the thickness of the plate-like body varies depending on the difference in the radial direction intersecting the axial direction with the center position of the through-fitting hole as a center. The electronic pen according to claim 5. The electronic pen according to claim 5, wherein the braking member is a plate-like body and includes a spiral slit with a center position of the through-fitting hole as a center. The core body fitting member is combined with a strain generating body that generates strain according to the force applied to the core body,
The electronic pen according to claim 1, wherein the force detection unit includes a strain detection sensor disposed in the strain body. The electronic pen according to claim 12, wherein the strain detection sensor detects strain due to a force component in the axial direction and strain due to a force component in a direction orthogonal to the axial direction. The electronic pen according to claim 1, wherein the braking member is engaged with the cylindrical casing. The electronic pen according to claim 1, wherein the braking member is engaged with the core body fitting member. 2. The electronic pen according to claim 1, wherein the brake member has a peripheral edge of the brake member fixed to the housing in the housing.

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