JP6024488B2 - Coil device for electronic pen - Google Patents

Description

  The present invention relates to a coil device for an electronic pen mounted inside an electronic pen for inputting desired information to a computer, for example.

  The electronic pen for inputting desired information to the computer may contain a coil device in which a wire is wound around the outer periphery of a core body such as a ferrite core, as shown in Patent Document 1, for example. is there. An electronic pen incorporating such a coil device is required to have a structure that facilitates automatic winding of a wire.

  Particularly recently, there is a case where the diameter of the electronic pen is required to be reduced. For example, in the conventional electronic pen coil device shown in Patent Document 1 or the like, automatic wire winding work is not easy, and the coil device, the circuit board, This complicates wiring and makes it difficult to reduce the pen diameter.

JP-A-5-275283

  The present invention has been made in view of such a situation, and an object of the present invention is to provide a coil device that facilitates automatic wire winding and can reduce the diameter of an electronic pen.

In order to achieve the above object, a coil device for an electronic pen according to the present invention comprises:
A core body disposed inside the electronic pen and having a first core end and a second core end respectively positioned on opposite sides in the axial direction;
A coil device for an electronic pen having a wire wound around an outer periphery of the core body to form a coil portion;
A wire guide is provided near the first core end on the outer periphery of the core body,
The wire guide protrudes radially outward from the outer periphery of the core body, and has at least one concave wire passage along the circumferential direction.

  In the coil device for an electronic pen according to the present invention, a method of forming a coil portion by winding a wire around the outer periphery of the core body is not particularly limited. For example, first, the first lead of the wire is set to the first core of the core body Secure to the end. Next, the wire is directed through the wire passage of the wire guide toward the second end of the core body without forming a coil portion. After that, the wire is chucked at the locking position located near the second end (closer than the first end), and the wire is temporarily fixed at the locking position on the surface of the core body. A coil portion is formed by winding a wire in a coil shape on the outer periphery of the core body located between the locking position and the wire guide. Thereafter, the second lead portion of the wire is pulled out from the wire passage toward the first core end.

  When winding a wire, the axial length for winding the wire is determined by a predetermined length divided by the locking position and the wire guide, making it easy to wind the wire and positioning the wire. The accuracy is improved, and a predetermined inductance, Q characteristic, frequency characteristic and the like can be realized with high accuracy, and the position detection accuracy by the electronic pen is also improved.

  In addition, since the first lead portion can be disposed on the inner peripheral side of the coil portion between the locking position and the wire guide, the wiring for the lead portion is not exposed outside the coil portion. The possibility that the wiring is caught by other members is also reduced. However, in the present invention, the coil portion may be formed such that the first lead portion is disposed outside the coil portion.

  Preferably, the wire guide is made of a nonmagnetic material different from that of the core body, and the first lead of the wire and the first lead are disposed at a predetermined distance along the axial direction from the first core end. Terminals to which two leads are connected are provided.

  By forming the wire guide separately from the core body, it is possible to easily form a terminal separated from the first core end by a predetermined distance.

  Preferably, the terminal includes a first terminal electrically connected to the first lead, and a second terminal insulated from the first terminal and electrically connected to the second lead portion. By separating the first terminal and the second terminal by a predetermined distance from the first core end, the Q characteristic of the coil device is improved.

  Preferably, a wire through groove extending along the axial direction from the first core end to the vicinity of the second core end is formed on the outer periphery of the core body. It becomes easy to guide the first lead portion of the wire in the direction of the locking position through the wire passage groove. In addition, the wire is wound around the outer circumference of the wire through groove through which the first lead portion of the wire is passed. Due to this wire through groove, the outer circumference of the wound coil portion extends along the first lead portion. Does not protrude outward.

  Preferably, the wire passage groove is aligned with a position overlapping the wire passage. According to such a structure, the first lead portion of the wire can be easily directed toward the locking position through the wire passage groove and the wire passage.

  Preferably, at least two wire passages are formed along the circumferential direction, and a separating projection is formed integrally with the wire guide between adjacent wire passages. According to such a structure, each lead can be directed from the coil portion to the wire holding portion through each wire passage, and the wiring of the leads becomes orderly.

FIG. 1 is a perspective view of a coil device for an electronic pen according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of an essential part taken along line II-II shown in FIG. FIG. 3 is a perspective view of the coil device shown in FIG. 1 with the nib and core removed, as seen from different angles. FIG. 4 is an exploded perspective view of the coil device from which the pen tip and the core shown in FIG. 1 are removed. FIG. 5 is a perspective view of the core body alone shown in FIG. FIG. 6 is a schematic view showing the axial distance between the first end of the core body shown in FIG. 1 and the terminal. FIG. 7 is a graph showing the relationship between the axial distance shown in FIG. 6 and the Q value of the coil device. FIG. 8 is a perspective view of a main part of a coil device according to still another embodiment of the present invention. FIG. 9 is a perspective view of a main part of a coil device according to still another embodiment of the present invention. FIG. 10 is a perspective view of the core body shown in FIG. FIG. 11 is a perspective view of a main part of a coil device according to still another embodiment of the present invention. 12 is a perspective view of the core body shown in FIG. FIG. 13 is a perspective view of a coil device according to still another embodiment of the present invention. 14 is an exploded perspective view of the coil device shown in FIG. FIG. 15 is a perspective view of the wire guide shown in FIG.

  Hereinafter, the present invention will be described based on embodiments shown in the drawings.

Electronic pen coil device 2 according to an embodiment of the present invention shown in the first embodiment FIG. 1, is mounted inside the electronic pen, together with the position information of the electronic pen, the change information of the use, for example, an electronic pen It is used as a part of a device that transmits information on applied pressure or displacement to a display screen for input such as a tablet in a non-contact manner.

  First, in this embodiment, the principle of detecting the position information of the electronic pen and the usage state of the electronic pen will be briefly described.

  When a tuning circuit (including the coil unit 20 shown in FIG. 1) provided in the electronic pen emits a radio wave having a predetermined tuning frequency, for example, frequency f0, from an input display screen such as a tablet (not shown), the radio wave is transmitted. In response to the excitation, an induced voltage is induced in the coil portion 20 shown in FIG. When the transmission of the radio wave is stopped, a radio wave having a predetermined frequency is transmitted from the coil unit 20 by a current based on the induced voltage. The position of the electronic pen (including the coil device 2) on the tablet (not shown) can be detected by receiving a radio wave transmitted from the tuning circuit including the coil unit 20 with a tablet (not shown).

  The pen tip 6a of the electronic pen core 6 is operated so as to be pressed against the surface of the tablet. During this operation, the core body 6 moves in the axial direction inside the coil portion 20 and presses one surface of the pressure sensitive element with a pressing member (not shown). In this embodiment, the pressure-sensitive element is composed of a variable capacitance capacitor, and the capacitance changes according to the pressing force (pressing displacement) acting on the element.

  This element is connected in parallel to a tuning circuit comprising a coil portion 20 and a capacitor mounted on a circuit board (not shown), and the tuning frequency of the tuning circuit changes according to the pressure applied to the element. Let In this case, when a radio signal having a frequency f0 is transmitted from a tablet (not shown), the tuning frequency of the tuning circuit is changed, so that the induced voltage generated in the coil unit 20 is out of phase with the non-operating state. Become. For this reason, a radio wave having a phase shifted from that of a radio wave transmitted from a tablet (not shown) is transmitted from the tuning circuit. Therefore, the operation of the electronic pen can be detected by transmitting a radio wave from a tablet (not shown) to excite the tuning circuit and detecting a phase difference in the radio wave emitted from the tuning circuit. In accordance with the phase shift detected from the electronic pen, it is possible to detect the thickness of the line to be realized by the electronic pen, the designated position, the hue or density (lightness) of the designated area, and the like.

  The coil device 2 according to this embodiment for realizing the function of the electronic pen has a core body 4 that can be mounted inside the electronic pen. The core body 4 has a shaft hole 4a penetrating along the longitudinal direction (X axis), and is constituted by a hollow cylinder. The core body 4 is made of a magnetic material, and is made of, for example, a soft magnetic material such as a ferrite material or permalloy, or a magnetic material formed by metal dust molding.

  As shown in FIG. 2, the cylindrical core body 4 is elongated in the X-axis direction along the inside of the electronic pen (not shown), and is a base end 4 b as a first end located on the opposite side in the axial direction. And a tip 4c as the second end. A wire guide 10a, which will be described later, is joined to the base end 4b by, for example, adhesion.

  In the present embodiment, the wire guide 10a is made of a nonmagnetic material different from the core body 4, for example, a synthetic resin. The wire guide 10a is integrally formed with a first terminal 30a and a second terminal 30b formed with a first claw portion 34a and a second claw portion 34b as wire holding portions, respectively. In the present embodiment, these terminals 30a and 30b are integrally formed by insert molding or the like on the wire guide 10a made of synthetic resin, but may be bonded by an adhesive or the like.

  As shown also in FIG. 4, in the present embodiment, the first terminal 30a and the second terminal 30b are composed of two metal terminals that are completely separated from each other, and are formed by punching from a metal plate. Is formed by bending. The first terminal 30a has an arc-shaped first terminal joining piece 31a, and a base end of the terminal holding portion 14 so as not to block the insertion hole 14a formed in the terminal holding portion 14 of the wire guide 10a. It is integrally formed near 14a.

  The upper part in the Z-axis direction of the first terminal joining piece 31a is bent in the direction away from the joining piece 31a along the X-axis direction to form a curved piece 33a, and the first locking groove 32a is interposed in the upper part. A pair of formed first claw portions 34a are integrally formed. The first locking groove 32a is tapered in width from the entrance toward the bottom, and the end of the first lead 22a of the wire 22 is only inserted from the entrance toward the bottom, so that One lead 22a is fixed to the terminal 30a.

  That is, the inlet width of the first locking groove 32 a is preferably equal to or greater than the outer diameter of the wire 22, and the bottom width of the first locking groove 32 a is preferably equal to or smaller than the outer diameter of the wire 22. Preferably, the bottom of the first locking groove 32a is formed up to a part of the curved piece 33a.

  A first terminal base 36a extending in the X-axis direction is formed below the first terminal joining piece 31a in the Z-axis direction, and a first board connection claw 38a is formed at one end of the base 36a in the X-axis direction. It is integrally formed by bending or the like. The first board connection claw 38a is connected to a circuit board (not shown), for example. A capacitor, other circuit elements, and the like are attached to the circuit board, and the first board connection claws 38a are electrically connected to the circuits and elements attached to the circuit board.

  The second terminal 30b is used as a pair with the first terminal 30a. As shown in FIG. 4, the second terminal 30 b has an arc-shaped second terminal joining piece 31 b and does not block the insertion hole 14 a formed in the terminal holding portion 14 of the wire guide 10 a. The terminal holding part 14 is integrally molded near the base end 14a.

  The upper part in the Z-axis direction of the second terminal joining piece 31b is bent in the direction away from the joining piece 31b along the X-axis direction to form a curved piece 33b, and the second locking groove 32b is interposed in the upper part. A pair of formed second claw portions 34b are integrally formed. The second locking groove 32b has the same structure as the first locking groove 32a.

  A second terminal base 36b extending in the X-axis direction is formed below the second terminal joining piece 31b in the Z-axis direction, and a second board connection claw 38b is formed at one end of the base 36b in the X-axis direction. It is integrally formed by bending or the like. The second board connection claw 38b has the same function as the first plate connection claw 38a.

  In the drawings, the X axis, the Y axis, and the Z axis are perpendicular to each other. In this embodiment, the X axis is the longitudinal direction of the core body 4, and the Y axis is the first locking groove 32a. This is the direction in which the second locking groove 32b is separated.

  In this embodiment, as shown in FIG. 4, the terminal holding part 14 is preferably formed integrally with the wire guide 10 a together with the outer peripheral cover 15, but the wire guide 10 a and the terminal holding part 14 are separately provided. It may be configured. The outer peripheral cover 15 is attached to the outer peripheral portion in the vicinity of the base end 4b of the core body 4 and is formed in a cylindrical shape so as to cover the portion, and a notch in the axial direction X is formed in a part of the peripheral direction. It is formed, and the portion serves as a wire passage 12a.

  The terminal holding portion 14 formed integrally and continuously with the outer peripheral cover 15 along the axial direction X has an insertion hole 14a in which the proximal end of the core body 6 shown in FIGS. It is formed. The terminal holding portion 14 is formed with a butt end surface 14c on the opposite side of the base end 14b in the axial direction X, and the butt end surface 14c of the core body 4 is abutted against the butt end surface 14c. .

  As shown in FIGS. 3 and 4, a part of the outer peripheral cover 15 in the axial direction and the upper and lower parts of the terminal holding part 14 in the Z-axis direction are notched with a notch surface parallel to the XY plane. The cover 15 has an upper notch 18 and a lower notch 19, and the terminal holding portion 14 has an upper flat surface 16 and a lower flat surface 17. Flat surfaces 16 and 17 are formed such that the widths of notches 18 and 19 in the Y-axis direction are wider than the width of wire path 12a in the Y-axis direction.

  In this embodiment, the width in the Y-axis direction of the wire passage 12 a formed in the outer peripheral cover 15 is narrower than the width in the Y-axis direction of the notch 18. The outer peripheral cover 15 is attached to the base end 4b of the core body 4 by means such as adhesion so that the base end 4b of the core body 4 is butted against the butted end surface 14c.

  The inner diameter of the insertion hole 14 a formed in the terminal holding portion 14 is approximately the same as the inner diameter of the shaft hole 4 a of the core body 4. Further, the flat surfaces 16 and 17 described above are formed so as not to expose the inside of the insertion hole 14a from the outer peripheral side. As shown in FIG. 3, it is preferable that the bases 36 a and 36 b of the terminals 30 a and 30 b extend in the X-axis direction along the lower flat end surface 17. On the upper flat surface 16, the claw portions 34a and 34b of the terminals 30a and 30b are separated in the Y-axis direction and protrude in the Z-axis direction. By having such a relationship, all the members shown in the figure are compactly accommodated in the elongate electronic pen, which contributes to reducing the diameter of the electronic pen.

  In the present embodiment, the terminals 30a and 30b described above have a function of simply holding the leads 22a and 22b of the coil unit 20, and a function of electrically connecting the coil unit 20 to a circuit board (not shown). .

  Next, the core body 4 and the coil part 20 are demonstrated in detail. As described above, the wire guide 10 a having the outer peripheral cover 15 covering the outer periphery of the core body 4 is mounted near the base end 4 a on the outer periphery of the core body 4. The wire guide 10a protrudes radially outward from the outer periphery of the core body 4, and has at least one concave wire passage 12a along the circumferential direction.

  In this embodiment, the outer periphery of the core body 4 located between the core side end surface 15a of the outer peripheral cover 15 formed on the wire guide 10a and the locking position 10b winds the wire to form the coil portion 20. It becomes space for. The locking position 10b is a position where the chucking device provided in the apparatus for automatically winding the wire chucks the wire, and can be set at an arbitrary position closer to the tip than the base end of the core body 4. is there.

  The wire 22 forming the coil portion 20 shown in FIG. 1 is not particularly limited, and for example, a litz wire, a USTC wire, a urethane wire, or the like is used. In particular, the use of a stranded wire such as a litz wire improves Q characteristics at high frequencies and is particularly preferable as a coil device for an electronic pen.

  As shown in FIG. 1, the first lead 22a of the wire 22 is inserted and fixed in the first locking groove 32a between the claws 34a and 34a of the first terminal 30a. Further, the end portion of the second lead 22b of the wire is inserted and fixed in the second locking groove 32b between the claw portions 34b and 34b of the second terminal 30b. The gap between the locking groove 32a and the locking groove 32b is preferably equal to or smaller than the circumferential width of the wire passage 12a in the wire guide 10a.

  In this embodiment, the wire 22 in which the end portion of the first lead 22a, which is the beginning of winding, is fixed in the locking groove 32a between the claw portions 34a passes through the first wire passage 12a without first forming a coil portion. It is directed to the locking position 10b. After that, the wire is locked with a chucking device or the like at the locking position 10b, and the base 4 is attached to the outer periphery of the core body 4 located between the locking position 10b and the wire guide 10a by automatic operation. The coil portion 20 is formed by winding the wire 22 in a coil shape toward the end 4b. When the wound wire 22 reaches the core side end surface 15a of the outer peripheral cover 15, the second lead portion 22b of the wire 22 is pulled out from the wire passage 12a toward the second locking groove 32b of the second terminal 30b, It fixes to the locking groove 32b.

  In the present embodiment, when the wire 22 is wound, the length in the axial direction around which the wire 22 is wound is determined by a predetermined length partitioned by the locking position 10b and the core side end face 15a in the wire guide 10a. It is determined and easy to wind the wire automatically. In addition, the positioning accuracy of the wire is improved, and predetermined inductance, Q characteristics, frequency characteristics, and the like can be realized with high accuracy, and the position detection accuracy by the electronic pen is also improved.

  Moreover, in this embodiment, the 1st lead part 22a can be arrange | positioned on the inner peripheral side of the coil part 22 between the wire guide 10a and the latching position 10b. For this reason, the wiring for the lead portion is not exposed to the outside of the coil portion 22, and the possibility that the wiring is caught by another member is reduced.

  Further, in the present embodiment, the wire guide 10 a is made of a nonmagnetic material different from the core body 4. Moreover, as shown in FIG. 6, the guide 10a is located at the base end 4b of the metal terminals 30a and 30b at a position separated from the base end 4b of the core body 4 by a predetermined distance d along the X-axis direction. The terminals 30a and 30b are held so that close portions (terminal joining pieces 31a and 31b) are located. In FIG. 6, the wire guide 10a that holds the terminals 30a and 30b is not shown.

  As shown in FIG. 1, by forming the terminal holding portion 16 integrally with the wire guide 10a, the first lead 22a and the second lead 22b of the wire 22 can be easily fixed. Further, by forming the wire guide 10a separately from the core body 4, the terminals 30a and 30b can be easily held away from the base end 4b of the core body 4 by a predetermined distance d. Thus, the Q characteristic of the coil device is improved by separating the first terminal 30a and the second terminal 30b from the base end 4b of the core body 4 by a predetermined distance d.

  This is clear from the experimental results of the present inventors shown in FIG. That is, as shown in FIG. 7, it is possible to improve and stabilize the Q characteristic of the coil device by separating the first terminal 30a and the second terminal 30b from the base end 4b of the core body 4 by a predetermined distance d. It became clear by the experiment of those. As shown in FIG. 7, in order to stably improve the Q value, the shortest distance d between the terminals 30a and 30b and the base end 4b of the core body 4 is preferably 0.5 mm or more, more preferably 0. It is 8 mm or more, and particularly preferably 1 mm or more. However, since the Q value does not change even if the shortest distance d is too large, d may be 3 mm or less, or 2 mm or less from the viewpoint of not unnecessarily increasing the distance.

  In the present embodiment, both ends of the wire 22 can be fixed to the first terminal 30a and the second terminal 30b simultaneously with the end of the winding. Since these terminals 30a and 30b are directly connected to a circuit pattern of a circuit board (not shown), no special wiring with the circuit board is required, and wiring between the coil unit 20 and the circuit board is simple. In this respect, the pen can be reduced in diameter.

  In the present embodiment, the locking grooves 32a and 32b of the terminals 30a and 30b are narrower from the entrance toward the bottom, and the ends of the leads 22a and 22b of the wire 22 are directed from the entrance to the bottom. The wire end is fixed to each terminal only by inserting. Also in this respect, the automatic wire winding operation is easy.

  Furthermore, in this embodiment, as shown in FIGS. 3 and 4, the positions of the first locking grooves 12a and the second locking grooves 12b along the circumferential direction of the core body 4 are the circumferential positions of the wire passage 12a. Is approximately the same. Because of such a structure, when the first lead 22a of the wire 22 is pulled out from the first locking groove 32a toward the wire passage 12a, the first of the wire 22 extends from the wire passage 12a toward the second locking groove 32b. When the two leads 22b are pulled out, it is only necessary to move the wire 22 in a straight line, so that the automatic winding operation of the wire 22 is further facilitated.

Second Embodiment In the present embodiment, as shown in FIG. 8, the winding direction of the wire 22 in the coil portion 20 is merely reversed to the winding direction of the wire 22 in the coil portion 20 in the first embodiment described above. . In the present embodiment, the winding direction of the wire 22 in the coil portion 20 is clockwise when viewed from the tip 4c of the core body 4, so that the direction of taking out the first lead 22a and the second lead 22b in the wire guide 10a is substantially reduced. It becomes possible to order in parallel. Other configurations and operational effects in the present embodiment are the same as those in the embodiment shown in FIGS. 1 to 7, and other descriptions are omitted.

Third Embodiment In the present embodiment, as shown in FIGS. 9 and 10, the outer periphery of the core body 4 is linear (not necessarily a straight line) from the proximal end 4b to the vicinity of the distal end 4c (including the entire length). A wire through groove 7 extending in the axial direction is formed in the inner wall. The wire through groove 7 may be formed by cutting or may be integrally formed with the core body 4.

  In the present embodiment, the cross section perpendicular to the X-axis of the wire passage groove 7 is a quadrangular shape, but is not limited to this shape, and may be a triangular shape, other polygonal shapes, a semicircular shape, an elliptical shape, or the like. Also good.

  In this embodiment, the width in the Y-axis direction of the wire passage groove 7 is designed to be smaller than the width in the Y-axis direction of the wire passage 12a formed in the outer peripheral cover 15, and at least one wire 22 enters. Designed to be wide. Further, the groove depth of the wire through groove 7 is greater than 0, preferably at least 1/2 times the outer diameter of one wire 22, more preferably at least 1 time the groove depth.

  The outer peripheral cover 15 is attached to the base end 4b of the core body 4 by means such as adhesion so that the wire passage groove 7 is included (overlapped) in the wire passage 12a. At that time, the base end 4b of the core body 4 is butted against the butted end surface 14c.

  The wire passage groove 7 of the core body 4 is positioned (overlapping position) within the circumferential width of the wire passage 12a of the wire guide 10a, and the first lead 22a of the wire 22 passed through the passage groove 7 is the first terminal 30a. Are inserted into the first locking groove 32a between the claw portions 34a, 34a and fixed. Further, the end portion of the second lead 22b of the wire is inserted and fixed in the second locking groove 32b between the claw portions 34b and 34b of the second terminal 30b.

  In the present embodiment, a wire passage groove 7 extending in the axial direction from the base end 4b to the vicinity of the tip end 4c is formed on the outer periphery of the core body 4. It becomes easy to guide the first lead portion 22a of the wire 22 through the wire through groove 7 in the direction of the locking position 10b. In addition, the wire 22 is wound around the outer periphery of the wire passage groove 7 through which the first lead portion 22 a of the wire 22 is passed to constitute the coil portion 20, but the wire 22 is wound for the wire passage groove 7. The degree to which the outer periphery of the coil portion 22 protrudes outward along the first lead portion 22a can be reduced.

  Furthermore, in this embodiment, as shown in FIG. 1, the wire passage groove 7 is aligned with a position overlapping the wire passage 12 a of the wire guide 10 a. According to such a structure, the first lead portion 22a of the wire 22 can be easily directed toward the locking position 10b through the wire passage groove 7 and the wire passage 12a. Furthermore, the first lead portion 22a of the wire 22 guided through the wire passage groove 7 is easily caught by the chucking device at the locking position 10b. Also in this respect, the wire 22 is automatically wound around the outer periphery of the core body 4. It's easy to do. That is, even if the outer diameter of the core body 4 is reduced, the automatic winding operation of the wire 22 becomes extremely easy.

  Furthermore, in this embodiment, the wire passage 12 a and the wire through groove 7 are formed at the same position in the circumferential direction of the core body 4. Because of this structure, the first lead 22a, which is the winding start end of the wire 22, can be moved linearly in the direction of the locking position 10b through the wire passage groove 7 and the wire passage 12a. Easy.

  Furthermore, in this embodiment, there is an advantage that the wire 22 going to the locking position 10b through the wire passage groove 7 is locked to the outer periphery of the core body at the locking position 10b, and the winding direction of the wire 22 can be freely selected. . In the present embodiment, other configurations and operational effects are the same as those in the first and second embodiments, and other descriptions are omitted.

Fourth Embodiment In the present embodiment, as shown in FIGS. 11 to 12, the X-axis of the core body 4a is arranged so that the wire passage groove 7a is located at the same position in the circumferential direction as the first locking groove 32a. It is formed over the entire length along the direction. The cross section (YZ plane) of the wire through groove 7a has a triangular shape.

  In the present embodiment, the first lead portion 22a of the wire 22 guided through the wire passage groove 7a in the direction of the locking position 10b is the outer periphery of the core body at the locking position 10b, as in the third embodiment. There is an advantage that the winding direction of the wire 22 can be freely selected. In the present embodiment, other configurations and operational effects are the same as those in the first to third embodiments, and other descriptions are omitted.

Fifth Embodiment In the present embodiment, as shown in FIGS. 13 to 15, the configuration of the wire guide 10c is different from that of the third embodiment, and the rest is the same as that of the fourth embodiment. In other words, in the present embodiment, the separation protrusion 11 is formed on the wire guide 10b so as to extend from the upper flat surface 16 of the terminal holding portion 14 to the outer periphery of the core body 4 in the X-axis direction. Is separated into two wire passages 12b and 12c. The outer peripheral surface of the separation convex portion 11 is an outer peripheral surface having the same outer diameter as that of the outer peripheral cover 15 and does not protrude to the outer diameter side from the outer peripheral cover 15.

  The tip 11a in the X-axis direction of the separation convex portion 11 is preferably flush with the core-side end face 15a of the outer peripheral cover 15, but is not necessarily flush with the two second lead portions 22a. It only needs to be easy to guide to the eye wire passage 12c. According to such a structure, the leads 22a and 22b can be directed from the coil portion 20 to the locking grooves 32a and 32b as wire holding portions through the wire passages 12b and 12c, and wiring of the leads 22a and 22b can be performed. Be orderly. In the embodiment shown in FIGS. 13 to 15, other configurations and operational effects are the same as those in the first to fourth embodiments, and other descriptions are omitted.

  The present invention is not limited to the above-described embodiment, and can be variously modified within the scope of the present invention.

  For example, the protruding height of the wire guides 10, 10 a, 10 b from the outer peripheral surface of the core body 4 is preferably about 1.5 to 2.5 times the wire diameter of the wire 22. This is to prevent the outer periphery of the coil portion 20 from exceeding the maximum diameter of the wire guides 10, 10a, 10b. The outer periphery of the guides 10, 10a, 10b may be configured to contact the inner peripheral surface of the outer casing of the electronic pen, which contributes to the reduction of the outer diameter of the electronic pen.

  In the embodiment described above, the core body 4 is formed with the shaft hole 4a penetrating along the longitudinal direction (X axis), and the core body 6 is passed through the shaft hole 4a. It is not always necessary to form a shaft hole. For example, in an electronic pen of a type that detects the writing pressure by changing the inductance without changing the capacitance, the core body 4 does not necessarily need to have a shaft hole. Furthermore, the core body 4 may have a polygonal cylinder shape other than a cylinder, an elliptical cylinder shape, other cylinder shapes, or an axial hole, and may have a prismatic shape other than a cylinder, or another column shape. The core body 4 may have a shape whose cross-sectional shape changes along the X-axis direction.

  In the present embodiment, the material of the core body 6 is not particularly limited, but is preferably a nonmagnetic material such as a synthetic resin. By configuring the core body 6 with a nonmagnetic material, the Q characteristic can be improved.

  Further, in the above-described embodiment, the locking grooves 32a and 32b are formed in the terminals 30a and 30b as the wire holding portions. However, the wire holding portions may be locking protrusions instead of the locking grooves. The first and second leads 22a and 22b may be entangled and fixed to each locking projection.

2 ... Coil device for electronic pen 4 ... Core body 4a ... Shaft hole 4b ... Base end (first core end)
4c ... Tip (second core end)
6 ... Core 6a ... Pen tip 7, 7a ... Wire through groove 8 ... Notch surface 8a ... Notch groove 10a ... Wire guide 10b ... Locking position 11 ... Separation convex part 12a, 12b, 12c ... Wire passage 14 ... Terminal holding portion 15 ... outer peripheral cover 15a ... core side end surface 16 ... upper flat surface 17 ... lower flat surface 18 ... upper notch 19 ... lower notch 20 ... coil portion 22 ... wire 22a ... first lead 22b ... second Lead 30a ... 1st terminal 30b ... 2nd terminal 31a ... 1st terminal joined piece 31b ... 2nd terminal joined piece 32a ... 1st locking groove 32b ... 2nd locking groove 34a ... 1st nail | claw part 34b ... 2nd nail | claw Part 36a ... First terminal base 36b ... Second terminal base

Claims (6)

A core body disposed inside the electronic pen and having a first core end and a second core end respectively positioned on opposite sides in the axial direction;
A coil device for an electronic pen having a wire wound around an outer periphery of the core body to form a coil portion;
A wire guide is provided near the first core end on the outer periphery of the core body,
The wire guide protrudes radially outward from the outer periphery of the core body, and has at least one concave wire passage along the circumferential direction ,
The core body is made of a magnetic body, has a shaft hole penetrating along the longitudinal direction, and the core body is movably held in the shaft hole,
The wire guide is made of a nonmagnetic material different from the core body, and the first lead and the second lead of the wire are arranged at a predetermined distance from the first core end along the axial direction. Each has a terminal to be connected,
The coil device for electronic pens whose said predetermined distance is 0.5 mm or more and 3 mm or less . 2. The wire guide according to claim 1, wherein the wire guide has a terminal holding portion that holds the terminal, and the terminal holding portion is formed with an insertion hole in which a base end of the core body is movable in the axial direction . Coil device for electronic pens. The terminal is
A first terminal electrically connected to the first lead;
Electronic pen coil device according to claim 1 or 2 and a second terminal electrically connected to the second lead portion is insulated to the first terminal.   The wire through-groove which extends along the said axial direction from the said 1st core end to the vicinity of the said 2nd core end is formed in the outer periphery of the said core body. Coil device for electronic pens.   The coil device for an electronic pen according to claim 4, wherein the wire passage groove is aligned with a position overlapping the wire passage.   The said wire channel | path is formed at least 2 along the circumferential direction, and the convex part for isolation | separation is integrally formed in the said wire guide between the adjacent wire channel | paths. The coil device for electronic pens described in 1.

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