JP2015125744A - Position indicator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a position indicator which is given an extended stroke life by reducing a load on contact portions.SOLUTION: When a pen tip is pressed against a writing surface, a first spring gets compressed between a front-end surface 41 of a substrate 40 and a rear-end surface 76 of a metallic spring holder 70 before a second spring 60 is compressed because elastic force of the first spring is smaller than that of the second spring 60. When the front-end surface 41 touches the rear-end surface 76, two contact portions provided on the front-end surface 41 conduct current. This turns on an electronic circuit on the substrate 40. Then, the second spring 60 gets compressed, but only reaction force of the second spring 60 acts on each of the contact portions. Even if the spring holder 70 gets tilted relative to the substrate 40, the second spring 60 automatically realigns the spring holder 70 to the front-end surface 41 of the substrate 40, reducing a load on the contact portions thereby.

Description

  The present invention relates to a position indicator.

  2. Description of the Related Art In recent years, electronic writing apparatuses that can electronically input handwritten contents of an operator are known (see, for example, Patent Document 1). In this electronic writing apparatus, an operator writes a desired handwritten character string or the like on a writing surface of a writing object using an electronic writing instrument such as a so-called electronic pen. At the same time, a writing signal is transmitted from the electronic writing instrument, and the writing signal is received by a coil arranged on the back surface of the writing object. Thereby, writing data is generated by the temporal change of the position information corresponding to the writing operation on the writing surface, and stored as an electronic file. That is, the electronic pen functions as a position indicator for instructing the apparatus main body the position close to the writing surface. The electronic pen is provided with a switch for detecting a pressure applied by writing at the pen tip, and a coil spring is disposed at a contact portion of the switch. When the operator presses the pen tip against the writing surface (pen down) to write letters, etc., the coil spring is compressed, and the metal part contacts the contact part as the pen tip moves, so the switch Turns on. On the other hand, when the operator stops writing characters or the like and separates the pen tip from the writing surface (pen-up), the metal part is separated from the contact portion by the reaction force of the coil spring, so that the switch is turned off.

JP 2012-173833 A

  Since the electronic pen as described above has a structure in which the writing load is applied to the contact part, when the operator's writing force is strong, the force is applied to the contact part. Further, depending on the inclination of the metal part or the contact part, a writing load is further applied, and as a result, there is a problem that the keying durability life as an electronic pen is shortened.

  An object of the present invention is to provide a position indicator that can extend the keying life by reducing the load applied to the contact portion.

  A position indicator according to an aspect of the present invention is a position indicator that outputs a detection signal from a signal output unit built in a housing and indicates a position close to a position detection device that detects the detection signal. An outer cylinder that is provided in the casing and has at least one end as an open end, a core part that is movably held in the outer cylinder, and that protrudes from its open end, and the outer cylinder A substrate having a plurality of contact portions of an electronic circuit for outputting the detection signal on the end surface on the opening end side, disposed on the other end side opposite to the opening end side, and having conductivity, The plurality of contact portions are arranged between the substrate and the core body portion and provided on the axis of the outer cylinder so as to be able to come into contact with and separate from the end surface. A conducting member that conducts, and is disposed between the substrate and the conducting member; A first elastic body that separates the end face of the substrate and the conducting member from each other, and a second elastic body that is disposed between the core body portion and the conducting member, and separates the core body portion and the conducting member from each other. And the second elastic body is in contact with the conducting member at four points that are positions at least in the cross direction around the center of the conducting member.

  In the position indicator, in addition to the first elastic body disposed at the contact portion, a repulsive force is applied between the conducting member and the core body portion to efficiently distribute the user's pressing force to the contact portion. Establish a body. Accordingly, when the user presses the position indicator, first, the conducting member is brought into contact with the end surface of the substrate by the first elastic body of the contact portion, thereby conducting the plurality of contact portions. After that, even if the user presses the position indicator with different pressing force, it is blocked by the restricting portion, and by pushing the conducting member with the elastic force of the second elastic body accumulated thereby, excessive force is applied to the multiple contact portions. Will not be added. Therefore, the lifetime of the contact can be extended. Furthermore, since the second elastic body contacts the conductive member at least at four points in the cross direction, the conductive member can be pressed from the periphery. Therefore, the conductive member can be uniformly pushed up by the second elastic body and brought into contact with the end face of the substrate. Thereby, even if the conducting member or the substrate is inclined, the conducting member is aligned by the second elastic body, so that the conducting member does not hit the end surface of the substrate. As a result, the contact life can be further extended, so that the keying life can be extended.

  In the first aspect, the second elastic body may be a ring-shaped elastic body. Since the second elastic body is a ring-shaped elastic body, the conducting member can be uniformly pressed from the periphery. Furthermore, an elastic force can be effectively applied between the conducting member and the core body portion.

  In the first aspect, the second elastic body may be a coil spring. Since the second elastic body is a coil spring, the conducting member can be uniformly pressed from the surroundings. Furthermore, a spring force can be effectively applied between the conducting member and the core body portion.

  Further, in the first aspect, the conducting member includes a cylindrical portion having a bottomed cylindrical shape, and a flange portion extending radially outward from one end portion of the cylindrical portion that is open, and the first elastic body includes: It is hold | maintained in the said cylindrical part, and the said 2nd elastic body may be arrange | positioned between the said collar part and the said core part, inserting the said cylindrical part of the said conduction | electrical_connection member inside. Since the second elastic body is disposed between the collar portion and the core portion of the conducting member, the second elastic body can be stably held. Since the first elastic body and the second elastic body are coaxially stacked via the cylindrical portion, a compact configuration can be achieved.

  Moreover, in the first aspect, the core body part includes a columnar pen-shaped core part and a cylindrical core part holder that holds the pen-shaped core part on one end side, and the second elastic body includes: The conductive member is disposed between the other end portion opposite to the one end side of the core holder, and the corner portion of the other end portion of the core holder is formed in a tapered shape. Are provided with ribs at positions in the cross direction around the axis of the core holder, and one end of the second elastic body on the core holder side is connected to the other end of the core holder. You may contact | abut with the four said ribs provided. Since the four ribs arranged in the cross direction are in contact with one end of the second elastic body, the other end of the core holder is in contact with the one end of the second elastic body in a balanced and stable manner. Can be made.

  In the first aspect, the portion of the second elastic body that comes into contact with the conducting member or the core body portion may be subjected to a polishing process in a planar shape perpendicular to the axial direction of the second elastic body. The portion of the second elastic body that comes into contact with the conducting member or the core body portion is subjected to a polishing process in a flat shape. Therefore, the second elastic body is flat on the conductive member or the core body portion without a gap. Can be contacted.

  In the first aspect, the second elastic body may be an O-ring. Since the second elastic body is an O-ring, an elastic force can be effectively applied at a relatively small distance.

1 is a perspective view of an information input device 1. FIG. 2 is a perspective view of an electronic pen 3. FIG. 3 is a partial cross-sectional view of the tip side of the electronic pen 3. FIG. 2 is a partial cross-sectional view of a rear end side of the electronic pen 3. FIG. It is a fragmentary sectional view (electronic circuit: OFF state) around substrate 40, spring holder 70, and refill holder 30. It is a fragmentary sectional view (electronic circuit: ON state) around the substrate 40, the spring holder 70, and the refill holder 30. FIG. 4 is a partial cross-sectional view around the substrate 40, the spring holder 70, and the refill holder 30 (electronic circuit: on state, edge 22 abutting against the stopper 32A). It is explanatory drawing which shows the mechanism in which the spring holder 70 is aligned when the spring holder 70 inclines. It is explanatory drawing which shows the mechanism in which the spring holder 70 is aligned when the board | substrate 40 inclines. In a 1st modification, it is a fragmentary sectional view of the board | substrate 40 of the electronic pen, the spring holder 70, and the refill holder 130 periphery. It is a perspective view which shows the rear end side of the refill holder. In the 2nd modification, it is a fragmentary sectional view (electronic circuit: off state) of the circumference of substrate 40, spring holder 370, and refill holder 330.

  Hereinafter, an electronic pen 3 according to an embodiment of the present invention will be described with reference to the drawings. The drawings to be referred to are used for explaining technical features that can be adopted by the present invention. The configuration of the device described in the drawings is not intended to be limited to that, but merely an illustrative example. In the following description, the upper left side, lower right side, upper side, lower side, lower left side, and upper right side in FIG. 1 are the left side, right side, upper side, lower side, front side, and rear side of the information input device 1, respectively. The lower side, upper side, right side, and left side of FIGS. 2 to 4 are the front end side, rear end side, right side, and left side of the electronic pen 3, respectively.

  The outline of the information input device 1 will be described with reference to FIG. The information input device 1 detects the position of the electronic pen 3 over time when the user enters information on the paper medium 100 attached to the information input device 1 using the electronic pen 3 of the present embodiment. It is a thin and light handwritten input device that is digitized. The information input device 1 includes housings 8L and 8R. The casings 8L and 8R are made of resin and have a rectangular thin plate shape. The casings 8L and 8R can be folded. The paper medium 100 is fixed to the front surfaces of the housings 8L and 8R. The housings 8L and 8R accommodate various substrates (not shown) such as sensor substrates. The sensor substrate has a rectangular flat plate shape, and detects the position of the electronic pen 3 in contact with or close to the detection area provided on the upper surface by an electromagnetic induction method.

  The paper medium 100 is a booklet-shaped medium that can be spread in the left-right direction. The paper medium 100 is formed by binding a pair of front covers (a front cover 110L and a back cover 110R) and a plurality of papers 120 at respective edges. As an example, the paper medium 100 is an A5 size notebook. The paper medium 100 is mounted on the information input device 1 so that the front cover 110L is placed on the upper surface of the housing 8L and the back cover 110R is placed on the upper surface of the housing 8R. With the paper medium 100 mounted on the information input device 1, the user can enter information on the paper 120 using the electronic pen 3. The position information of the electronic pen 3 for writing information on the paper medium 100 is detected by the sensor substrate accommodated in the housing 8L or 8R facing the paper 120 on which information is written.

  The external structure of the electronic pen 3 will be described with reference to FIG. The electronic pen 3 includes a cylindrical cover 10. An opening 5 is provided at the front end portion of the cover 10, and a knock portion 6 is provided at the rear end portion. When the user pushes the knock portion 6 with the fingertip, the penpoint 16 of the refill 15 (see FIG. 3) is moved out and out of the opening 5 by a known ratchet mechanism provided inside. When the user holds the electronic pen 3 and presses the pen tip 16 against the writing surface of the paper 120 (pen down), an electronic circuit (not shown) provided on a substrate 40 described later in the cover 10 is turned on. . On the other hand, when the user stops writing characters or the like and moves the pen tip 16 away from the writing surface of the paper 120 (pens up), the electronic circuit (not shown) is turned off. When the electronic circuit is turned on, a writing signal that is a magnetic field of a predetermined frequency is output from the coil 12 connected to the substrate 40 of the electronic pen 3. The information input device 1 detects position information of the electronic pen 3 by receiving a writing signal output from the electronic pen 3. A mechanism for switching on and off an electronic circuit provided on the substrate 40 by pen-down and pen-up will be described later.

  The cover 10 is divided into three parts: a rear side part 101, a central part 102, and a cap part 103. The rear side portion 101 and the central portion 102 are formed in a cylindrical shape. On the side surface of the rear side portion 101, for example, a leaf spring 7 for holding the electronic pen 3 sandwiched between a wide pocket and the like is provided. The front end portion of the rear side portion 101 and the rear end portion of the central portion 102 are coaxially connected to each other via a ring 105. A cap portion 103 is attached to the distal end portion of the central portion 102. The cap portion 103 is formed in a cylindrical shape having the above-described opening 5 at the tip portion, and protects the pen tip 16 that is withdrawn from the opening 5.

  The internal structure of the electronic pen 3 will be described with reference to FIGS. As shown in FIGS. 3 and 4, the electronic pen 3 has a main frame 20, a refill 15, a coil 12, a refill holder 30, a substrate 40, a spring holder 70, a first spring 50, and a second spring 60 inside the cover 10. The knock transmission unit 17 and the like are provided. The main frame 20 is a substantially cylindrical resin part having a partially opened side surface, and is arranged from the cap portion 103 to the central portion in the axial direction of the rear side portion 101. The refill 15 is a replacement core and includes a nib 16 at the tip of a tube filled with ink. The refill 15 is held by the refill holder 30.

  As shown in FIG. 3, the coil 12 is a magnetic field transmitting coil wound around the tip side of the refill 15. As shown in FIG. 4, the refill holder 30 is a substantially cylindrical resin part that is attached to the inside of the main frame 20 and holds the refill 15 coaxially. The substrate 40 is attached to the rear of the refill holder 30 in the main frame 20 so as to be separated. The substrate 40 is formed in a rectangular shape and includes at least an electronic circuit that outputs a writing signal to the outside. Both ends of the coil 12 are electrically connected to the electronic circuit of the substrate 40 via wiring (not shown).

  As shown in FIG. 4, the spring holder 70 is provided on the front end side of the substrate 40 in the main frame 20. The spring holder 70 is a metal part formed in a substantially cylindrical shape, and holds a first spring 50 described later between the front end surface 41 of the substrate 40. Accordingly, the spring holder 70 is provided so as to be able to contact and separate in the axial direction with respect to the tip surface 41 of the substrate 40. The first spring 50 is a cylindrical coil spring (for example, SUS) and is held by the spring holder 70. The first spring 50 separates the tip surface 41 of the substrate 40 from the spring holder 70. The second spring 60 is a cylindrical coil spring (for example, SUS) having a larger diameter than the first spring 50, and the spring holder 70 is inserted inside. The second spring 60 separates the spring holder 70 and the refill holder 30 from each other. The knock transmission portion 17 is provided between the knock portion 6 and the main frame 20 in the rear side portion 101 of the cover 10. The knock transmission unit 17 includes cylindrical transmission members 17A and 17B that are coaxially connected to each other. The rear end portion of the transmission member 17 </ b> A contacts the knock portion 6, and the front end portion of the transmission member 17 </ b> B contacts the rear end portion 25 of the main frame 20.

  Although not shown, a known ratchet mechanism (not shown) that moves the main frame 20 in the axial direction of the cover 10 by pressing the knock portion 6 is provided inside the cover 10. The ratchet mechanism includes a tooth portion provided on the side surface of the main frame 20, a claw portion provided on the inner peripheral surface of the cover 10, and a spring that elastically holds the claw portion. The ratchet mechanism repeats a series of movements of sliding, fixing, and releasing the main frame 20 with a mechanism using a force and a spring that push the knock portion 6. When the knock portion 6 is pressed once, the ratchet mechanism slides the main frame 20 toward the distal end side of the cover 10 and feeds it, and the teeth of the main frame 20 are fixed by the claw portions. At this time, the pen tip 16 protrudes from the opening 5 of the cover 10. When the knock portion 6 is pushed again, the ratchet mechanism releases the claw portion and slides the main frame 20 to the rear of the cover 10 by the force of the spring. At this time, the pen tip 16 is retracted into the cover 10 from the opening 5.

  The structure and position of the refill holder 30 will be specifically described with reference to FIGS. The refill holder 30 is a flanged cylindrical resin part (for example, polycarbonate or the like). As shown in FIG. 5, the refill holder 30 includes a main body 31 and a flange 32 on the same axis. The main body 31 is formed in a cylindrical shape, and a holding hole 33 is provided in the axial direction inside thereof. In the holding hole 33, the rear end side of the refill 15 from the front end side of the main body portion 31 is held by press-fitting. A circular rear end surface 35 is provided on the rear end side of the main body 31. An insertion hole 34 is provided at the center of the rear end face 35. The insertion hole 34 communicates with the holding hole 33. A protrusion 73 described later of the spring holder 70 is loosely inserted into the insertion hole 34.

  The collar portion 32 is formed in a collar shape that extends radially outward from the outer peripheral surface of the central portion in the axial direction of the main body portion 31 and has a thickness in a direction parallel to the axial direction. The collar portion 32 is disposed inside the opening 21 provided at a substantially central portion in the axial direction of the main frame 20. The opening 21 is formed in a rectangular shape in a side view and extends in a direction parallel to the axial direction of the main frame 20. The rear end surface of the collar portion 32 is a stopper 32A. The stopper 32A is disposed to face the edge 22 on the rear end side of the opening 21 of the main frame 20 via a third gap R1 described later. Further, the distal end portion 38 of the main body 31 abuts against a stopper 27 provided on the distal end side of the opening 21 in the main frame 20. The stopper 27 is a step portion having a diameter reduced radially inward. Due to the structure and position, the refill holder 30 is movable relative to the main frame 20 within the range of the axial distance of the third gap R1.

  The structure and position of the spring holder 70 will be specifically described with reference to FIGS. The spring holder 70 is a bottomed cylindrical metal part with a flange (for example, brass or SUS). The material of the spring holder 70 is not limited to metal, and may be a member having conductivity. The spring holder 70 includes a main body 71 and a flange 72 on the same axis. The main body 71 is formed in a bottomed cylindrical shape, and a holding hole 75 is provided in the axial direction on the inner side. The holding hole 75 opens to the substrate 40 side and has a bottom 74 on the opposite side. The first spring 50 is accommodated coaxially in the holding hole 75.

  The collar portion 72 is formed in a collar shape that extends radially outward from the outer peripheral surface of one end portion of the main body portion 71 facing the substrate 40 side in the axial direction and has a thickness in a direction parallel to the axial direction. Yes. The rear end surface 76 of the collar portion 72 is brought into contact with the front end surface 41 of the substrate 40, thereby electrically connecting the contact portions 45 and 46 provided on the front end surface 41. The rear end portion of the second spring 60 is engaged with the front end surface 77 of the flange portion 72. Further, the main body 71 has a columnar protrusion 73 at the center of the outer surface of the bottom 74. The protrusion 73 extends coaxially with the main body 71. The protrusion 73 is loosely inserted into the insertion hole 34 of the refill holder 30. Thereby, the refill holder 30 and the spring holder 70 are coaxially arranged in the main frame 20.

  The structure of the substrate 40 will be specifically described with reference to FIGS. The substrate 40 has a front end surface 41 and a rear end surface 42 in a state of being disposed in the main frame 20. A pair of concave portions 47 and 48 are provided in the center portion of the distal end surface 41 in the width direction. Both of the recesses 47 and 48 are formed by cutting back in a substantially arc shape. A protrusion 49 is formed between the recesses 47 and 48. The protrusion 49 has a trapezoidal shape that protrudes toward the front end side of the main frame 20.

  Further, as shown in FIG. 5, two contact portions 45 and 46 are provided on both the left and right sides of the concave portions 47 and 48 of the protrusion 49, respectively. The contact portions 45 and 46 are electrically connected to an electronic circuit provided on the substrate 40. For the contact portions 45 and 46, for example, gold plating having high hardness is used. The contact portions 45 and 46 are separated from each other. Therefore, if the rear end surface 76 of the spring holder 70 is not in contact with the front end surface 41, the contact portions 45 and 46 are not conducted, and the electronic circuit connected to the contact portions 45 and 46 is turned off. On the other hand, if the rear end surface 76 of the spring holder 70 is in contact with the front end surface 41, the contact portions 45 and 46 are conducted, so that the electronic circuit is turned on.

  Further, groove portions 43 and 44 are provided on both left and right end surfaces of the substrate 40, respectively. The groove portions 43 and 44 are curved in a circular arc shape in directions opposite to each other. A set of wirings (not shown) connected to one end and the other end of the coil 12 (see FIG. 3) are respectively passed through the grooves 43 and 44, and connected to an electronic circuit by soldering.

  Further, as shown in FIG. 4, the front end portion of the position adjusting screw 80 provided at the rear end portion 25 of the main frame 20 contacts the rear end surface 42 of the substrate 40. The position adjusting screw 80 is screwed into the position adjusting hole 26 provided in the rear end portion 25 from the outside, and the tip end portion penetrates into the main frame 20. The board 40 is positioned on the main frame 20 by adjusting the screwing amount of the position adjusting screw 80.

  With reference to FIG. 5, the positional relationship between the first spring 50 and the second spring 60 will be specifically described. The first spring 50 is accommodated substantially coaxially in the holding hole 75 of the spring holder 70. The rear end side of the first spring 50 protrudes rearward from the rear end surface 76 of the spring holder 70 while reducing the diameter in the radial direction, and engages with the inner portions of the recesses 47 and 48 provided on the front end surface 41 of the substrate 40. Thereby, the first spring 50 is held between the spring holder 70 and the front end surface 41 of the substrate 40. On the other hand, the second spring 60 is in a state in which the main body 71 of the spring holder 70 is inserted inside, the rear end thereof abuts on the front end surface 77 of the flange 72 of the spring holder 70, and the front end is the main body of the refill holder 30. It contacts the rear end surface 35 of the portion 31. As a result, the second spring 60 is held between the spring holder 70 and the refill holder 30. Since the second spring 60 is mounted on the outer peripheral surface of the spring holder 70 that holds the first spring 50 in the holding hole 75, the first spring 50 can be coaxially stacked inside the second spring 60. Thereby, since the area | region which arrange | positions the 1st spring 50 and the 2nd spring 60 in the main frame 20 can be made small, the electronic pen 3 can be designed compactly to an axial direction.

  With reference to FIG. 5, each spring force of the 1st spring 50 and the 2nd spring 60 is demonstrated. The spring force of the first spring 50 is adjusted to be larger than at least the total weight of the refill 15, the refill holder 30, the spring holder 70, and the second spring 60. When the direction of the electronic pen 3 is reversed so that the pen tip 16 is directed upward, the total weight of the refill 15, the refill holder 30, the spring holder 70, and the second spring 60 is applied to the first spring 50. However, since the spring force of the first spring 50 is adjusted as described above, the first spring 50 is not compressed simply by turning the pen tip 16 upward. Therefore, when the user simply points the pen tip 16 upward, the front end surface 41 of the substrate 40 and the rear end surface 76 of the spring holder 70 come into contact with each other, the contact portions 45 and 46 are conducted, and position information is erroneously detected. Can be prevented.

  Further, the spring force of the second spring 60 is adjusted to be larger than the spring force of the first spring 50. Thus, when a load that compresses in the axial direction is applied to the first spring 50 and the second spring 60 at the same time, the first spring 50 is compressed before the second spring 60. By utilizing this property, the rear end surface 76 of the spring holder 70 can be brought into early contact with the front end surface 41 of the substrate 40, and the contact portions 45 and 46 can be brought into electrical conduction early. The mechanism of conduction of the contact portions 45 and 46 by pen-up or pen-down of the electronic pen 3 will be described in detail next.

  With reference to FIGS. 5-7, the positional relationship of the various members in the electronic pen 3 at the time of pen-down from pen-up and the mechanism for switching the on / off state of the electronic circuit will be described. First, as shown in FIG. 5, in a pen-up state in which no pen pressure is applied to the pen tip 16, the front end surface 41 of the substrate 40 and the rear end surface 76 of the spring holder 70 are caused by the elastic force of the first spring 50. A first gap P1 is formed between them. Furthermore, a second gap Q <b> 1 is formed between the outer surface of the bottom 74 of the main body 71 of the spring holder 70 and the rear end surface 35 of the main body 31 of the refill holder 30 by the elastic force of the second spring 60. . A third gap R <b> 1 is formed between the edge 22 on the rear end side of the opening 21 of the main frame 20 and the stopper 32 </ b> A of the flange 32 of the refill holder 30. An example of the axial distance of the third gap R1 is 0.8 mm.

  As described above, in the pen-up state, the distal end portion 38 of the main body portion 31 of the refill holder 30 is in contact with the stopper 27 provided on the inner peripheral surface of the main frame 20. As a result, the refill holder 30 does not move to the tip side from this, so that it can move relative to the main frame 20 within the range of the axial distance of the third gap R1. In the pen-up state, the rear end surface 76 of the spring holder 70 is separated from the front end surface 41 of the substrate 40 by the first gap P1, so that the contact portions 45 and 46 provided on the front end surface 41 do not conduct. Therefore, the electronic circuit provided on the substrate 40 is turned off, so that a predetermined writing signal is not output from the coil 12.

  Next, when the user pens down the pen tip 16 on the writing surface of the paper 120, the vertical positions of the refill 15 and the refill holder 30 with respect to the writing surface are fixed to the writing surface. Therefore, the writing load applied to the pen tip 16 presses the main frame 20 relatively against the refill holder 30. As the main frame 20 moves downward, the substrate 40 fixed to the main frame 20 also moves downward. Here, as described above, the elastic force of the first spring 50 is smaller than the elastic force of the second spring 60. Therefore, the first spring 50 is compressed between the front end surface 41 of the substrate 40 and the rear end surface 76 of the spring holder 70 prior to the second spring 60 according to the writing load applied to the pen tip 16.

  Then, as shown in FIG. 6, when the front end surface 41 of the substrate 40 comes into contact with the rear end surface 76 of the spring holder 70, the second spring 60 is next connected to the rear end surface 35 of the body portion 31 of the refill holder 30 and the spring holder 70. Since the second spring 60 is compressed with respect to the front end surface 77 of the collar portion 72, the rear end surface 76 of the spring holder 70 is pushed up against the front end surface 41 of the substrate 40. Therefore, the contact portions 45 and 46 are brought into contact with the rear end surface 76 of the spring holder 70 by the reaction force of the second spring 60 and are electrically connected to each other. As a result, the electronic circuit provided on the substrate 40 is switched on, and a predetermined writing signal is output from the coil 12.

  Further, when the user applies a load to the writing surface, the second spring 60 is compressed between the rear end surface 35 of the main body portion 31 of the refill holder 30 and the front end surface 77 of the collar portion 72 of the spring holder 70. . At this time, only the reaction force generated by the compression of the second spring 60 is applied to the contact portions 45 and 46 provided on the front end surface 41 of the substrate 40. Thereby, since the user's writing pressure is not directly applied to the contact portions 45 and 46, the load applied to the contact portions 45 and 46 can be effectively reduced. Since the contact portions 45 and 46 and the rear end surface 76 of the spring holder 70 can be brought into close contact with each other by the reaction force of the second spring 60, the contact portions 45 and 46 can be reliably connected.

  Further, as shown in FIG. 7, when the user applies a further load to the writing surface, the substrate 40 moves further downward together with the main frame 20, and the second spring 60 is further compressed. The 20 edge portions 22 come into contact with the stopper 32 </ b> A of the flange portion 32 of the refill holder 30. At this time, the refill holder 30 is in a state of being closest to the substrate 40, but there is a gap between the outer surface of the bottom 74 of the main body 71 of the spring holder 70 and the rear end surface 35 of the main body 31 of the refill holder 30. Is retained. That is, the refill holder 30 does not abut against the spring holder 70 and is pressed against the substrate 40 side. Therefore, the user's writing load can be finally received by the stopper 32 </ b> A of the collar portion 32 of the refill holder 30. Since the writing load is not directly applied to the front end surface 41 of the substrate 40, the load applied to the contact portions 45 and 46 can be reduced. Since the load applied to the contact portions 45 and 46 can be reduced, the gold plating forming the contact portions 45 and 46 can be prevented from being damaged.

  The alignment function by the second spring 60 will be described with reference to FIGS. In FIGS. 8 and 9, various members are simplified for convenience of explanation. In the configuration of the electronic pen 3 described above, for example, the spring holder 70 may be inclined with respect to the substrate 40 as shown in FIG. Further, as illustrated in FIG. 9A, the substrate 40 may be inclined with respect to the spring holder 70. These states occur, for example, in the main frame 20 due to displacement of the assembly positions of the substrate 40, the spring holder 70, and the refill holder 30. In addition, when the refill 15 is replaced and the resin tube of the refill 15 is warped, the position of the refill holder 30 is shifted due to the warp of the tube, and the spring holder 70 may be inclined with respect to the substrate 40. Conceivable.

  Accordingly, the second spring 60 of the present embodiment is a coil spring, and the spring holder 70 is supported by the second spring 60 toward the substrate 40 with equal pressure from the periphery thereof. In addition, the position of the spring holder 70 can be automatically aligned.

  For example, as illustrated in FIG. 8A, when the spring holder 70 is inclined with respect to the front end surface 41 of the substrate 40, the rear end surface 76 of the spring holder 70 is not parallel to the front end surface 41. When the pen is down in this state, a part of the rear end surface 76 of the spring holder 70 comes into contact with the front end surface 41. From this state, when the refill holder 30 pushes the spring holder 70 toward the substrate 40 further through the second spring 60, only one side of the second spring 60 that contacts the tip surface 41 through the spring holder 70 is refilled. It is pushed down toward the holder 30. Then, a reaction force is generated in the second spring 60, and the opposite side of the pressed one side spreads in the axial direction. As a result, as shown in FIG. 8B, the spring holder 70 is rotated and aligned in the direction in which the inclination is corrected. The second spring 60 returns to the original cylindrical shape parallel to the axial direction. Therefore, since the rear end surface 76 is parallel to the front end surface 41, the rear end surface 76 can be brought into close contact with the front end surface 41 without a gap.

  As shown in FIG. 9A, even when the substrate 40 is inclined with respect to the spring holder 70, the rear end surface 76 of the spring holder 70 is not parallel to the front end surface 41. When the pen is down in this state, a part of the rear end surface 76 of the spring holder 70 comes into contact with the front end surface 41. From this state, when the refill holder 30 further pushes the spring holder 70 toward the substrate 40 via the second spring 60, only one side of the second spring 60 that contacts the tip surface 41 via the spring holder 70 is the refill holder. Pushed down to 30. Then, the opposite side of the pressed-down one side of the second spring 60 spreads in the axial direction. As a result, as shown in FIG. 9B, the second spring 60 is bent so that the rear end surface 76 of the spring holder 70 is pressed against the front end surface 41, whereby the spring holder 70 is rotated and aligned. The Therefore, the rear end surface 76 can be adhered to the front end surface 41 without a gap.

  As described above, in any of the scenes of FIGS. 8 and 9, the rear end surface 76 can be brought into close contact with the front end surface 41 without a gap during pen-down. That is, the rear end surface of the spring holder 70 and the front end surface 41 of the substrate 40 provided with the contact portions 45 and 46 can be brought into contact with each other on a uniform plane. Accordingly, it is possible to prevent contact with only one of the contact portions 45 and 46, so that uneven wear and contact failure of the contact portions 45 and 46 can be prevented. And since only low pressure (reaction force of the 2nd spring 60) is applied to the contact parts 45 and 46, contact life can be lengthened. Therefore, the keystroke life of the electronic pen 3 can be extended.

  In the present embodiment, as shown in FIG. 5, in the pen-up state, the moving area of the refill holder 30 is maintained by reducing the axial distance of the second gap Q1 as much as possible in the main frame 20. However, excessive movement can be restricted. That is, by securing the amount of movement of the refill holder 30, the reaction force of the second spring 60 can be applied to the contact portions 45 and 46, so that the contact portions 45 and 46 can be reliably conducted. On the contrary, by restricting the excessive amount of movement of the refill holder 30, the pen tip 16 does not sink excessively, so that the user feels uncomfortable when writing.

  In the present embodiment, as shown in FIG. 5, the third gap R1 is adjusted to be longer than the first gap P1 in the pen-up state. Thereby, even after the front end surface 41 of the substrate 40 and the rear end surface 76 of the spring holder 70 come into contact with each other, the refill holder 30 can be moved in the main frame 20, and the user's writing pressure is finally reduced by the stopper 32A. I can take it. Furthermore, by moving the refill holder 30, the second spring 60 can be compressed to generate a repulsive force between the spring holder 70 and the refill holder 30.

  Further, the edge portion 22 of the main frame 20 contacts the stopper 32 </ b> A of the flange portion 32 of the refill holder 30, so that the positional relationship between the main frame 20 and the refill holder 30 is fixed. Therefore, the user can stably write on the writing surface of the paper 120 in a state where the pen tip 16 always protrudes from the opening 5 of the cover 10 by a predetermined amount.

  In the above description, the cover 10 corresponds to the “casing” of the present invention, the coil 12 corresponds to the “signal output unit” of the present invention, and the information input device 1 corresponds to the “position detection device” of the present invention. The electronic pen 3 corresponds to the “position indicator” of the present invention, the main frame 20 corresponds to the “outer cylinder” of the present invention, and the refill 15 and the refill holder 30 correspond to the “core body” of the present invention. The refill 15 corresponds to the “pen-shaped core” of the present invention, the refill holder 30 corresponds to the “core holder” of the present invention, the spring holder 70 corresponds to the “conducting portion” of the present invention, and the first spring. 50 corresponds to the “first elastic body” of the present invention, and the second spring 60 corresponds to the “second elastic body” of the present invention.

  As described above, the electronic pen 3 of this embodiment includes the main frame 20 in the cover 10. The main frame 20 accommodates the refill 15, the refill holder 30, the substrate 40, the spring holder 70, the first spring 50, the second spring 60, and the like. The refill holder 30 holds the refill 15 on the tip side. The substrate 40 is attached behind the refill holder 30 so as to be separated. On the front end surface 41 of the substrate 40, contact portions 45 and 46 connected to an electronic circuit for outputting a writing signal to the outside are provided apart from each other. The spring holder 70 is a metal part formed in a substantially cylindrical shape, holds the first gap 50 between the first spring 50 and the front end surface 41 of the substrate 40, and is in contact with and separated from the front end surface 41 of the substrate 40. It is provided as possible. The first spring 50 separates the tip surface 41 of the substrate 40 from the spring holder 70. The second spring 60 is a cylindrical coil spring having a larger diameter than the first spring 50, and the spring holder 70 is inserted inside. The second spring 60 separates the spring holder 70 and the refill holder 30 from each other. In this state, the stopper 32A, which is the rear end surface of the flange portion 32 of the refill holder 30, is disposed opposite to the edge portion 22 on the rear end side of the opening portion 21 of the main frame 20 via the third gap R1. .

  In the electronic pen 3 configured as described above, in a pen-up state where no writing pressure is applied to the pen tip 16, the rear end surface 76 of the spring holder 70 is separated from the front end surface 41 of the substrate 40 by the first gap P1. Therefore, the contact portions 45 and 46 provided on the tip surface 41 are not conducted. Therefore, the electronic circuit provided on the substrate 40 is turned off, so that a predetermined writing signal is not output from the coil 12. Next, when the user pens down the pen tip 16 onto the paper 120, the writing pressure applied to the pen tip 16 pushes down the main frame 20 relative to the refill holder 30. As the main frame 20 moves downward, the substrate 40 also moves downward. The elastic force of the first spring 50 is smaller than the elastic force of the second spring 60. Therefore, it is compressed before the second spring 60 according to the writing pressure applied to the pen tip 16. When the front end surface 41 of the substrate 40 abuts on the rear end surface 76 of the spring holder 70, the contact portions 45 and 46 are conducted through the rear end surface 76 of the spring holder 70. As a result, the electronic circuit provided on the substrate 40 is switched on, and a predetermined writing signal is output from the coil 12.

  Furthermore, when the user applies a load to the writing surface, the front end surface 41 of the substrate 40 and the rear end surface 76 of the spring holder 70 are already in contact with each other, so that the load is applied to the second spring 60. Accordingly, the second spring 60 is compressed. At this time, only the reaction force generated by the compression of the second spring 60 is applied to the contact portions 45 and 46 provided on the front end surface 41 of the substrate 40. Thereby, since the user's writing pressure is not directly applied to the contact portions 45 and 46, the load applied to the contact portions 45 and 46 can be effectively reduced. Since the contact portions 45 and 46 and the rear end surface 76 of the spring holder 70 can be brought into close contact with each other by the reaction force of the second spring 60, the contact portions 45 and 46 can be reliably connected.

  In the present embodiment, in particular, the second spring 60 is a coil spring, and the spring holder 70 is supported by the second spring 60 toward the substrate 40 with equal pressure from the periphery thereof. Thereby, for example, even when the spring holder 70 is inclined with respect to the substrate 40 or when the substrate 40 is inclined with respect to the spring holder 70, the spring holder is aligned with the front end surface 41 of the substrate 40 by the second spring 60. 70 positions can be automatically aligned. Since the rear end surface 76 can be adhered to the front end surface 41 without a gap, the rear end surface 76 of the spring holder 70 and the contact portions 45 and 46 can be brought into contact with each other on a uniform plane. Accordingly, contact with only one of the contact portions 45 and 46 can be prevented, so that uneven wear and contact failure of the contact portions 45 and 46 can be prevented. Therefore, only a low pressure (reaction force of the second spring 60) is applied to the contact portions 45 and 46, so that the keystroke life of the electronic pen 3 can be extended.

  In addition, this invention is not limited to the said embodiment, The change in the range which does not change the summary of invention is possible. Hereinafter, the first and second modifications will be described in order. For convenience of explanation, the same members as those in the above embodiment will be described with the same reference numerals.

  The first modification will be described with reference to FIGS. As illustrated in FIG. 10, the electronic pen according to the first modification includes a first spring 150 instead of the first spring 50 of the above embodiment. The first spring 150 can prevent the first spring 150 from dropping from the substrate 40 by fixing one end side (rear end side) to the front end surface 41 of the substrate 40. An end wound portion 151 is formed on one end side of the first spring 150. The end turn 151 is formed in a cylindrical shape with a predetermined number of turns (for example, the number of turns: 5). The front end surface 41 of the substrate 40 is provided with recesses 147 and 148 that are deeper than the recesses 47 and 48 of the above embodiment, and a protrusion 149 longer than the protrusion 49 of the above embodiment is formed therebetween. The end winding portion 151 of the first spring 150 is fitted into the protruding portion 149. At this time, the axial length of the end turn 151 is set to be equal to or greater than the height of the protrusion 149 so as not to affect the writing load. With such a structure, the first spring 150 can be fixed to the front end surface 41 of the substrate 40. Further, even if the first spring 150 is repeatedly compressed, the position of the first spring 150 does not shift with respect to the substrate 40, so that a stable spring force is provided between the front end surface 41 of the substrate 40 and the rear end surface 76 of the spring holder 70. Can be granted.

  As shown in FIGS. 10 and 11, the electronic pen of the first modified example includes a resin refill holder 130 instead of the refill holder 30 of the above embodiment. Since the refill holder 30 (see FIG. 5) of the above embodiment is a resin molded product, the corner where the outer peripheral surface of the main body 31 and the rear end surface 35 intersect with each other is not exactly a right angle during the die cutting process. However, it may be slightly inclined. If the corner portion is inclined, the tip end portion of the second spring 60 cannot be brought into direct contact with the rear end face 35, the position may be shifted, and the posture of the second spring 60 may be inclined. is there. Since the internal structure of the electronic pen 3 is very small and various components are extremely small, the electronic pen 3 cannot perform the above-described pen-up and pen-down operations well if the positional relationship between the various components is shifted.

  Therefore, as shown in FIG. 11, in the refill holder 130, a corner portion where the rear end surface 135 of the main body 131 intersects with the outer peripheral surface is a tapered inclined surface 137, and four ribs 138 are provided on the inclined surface 137. ing. The four ribs 138 are arranged in the cross direction around the insertion hole 134 provided in the center of the main body 131. Each of the ribs 138 is formed in a right triangle shape having one side continuous to the rear end surface 135 and a right angle portion toward the outside. The tip of the second spring 60 can be reliably brought into contact with such four ribs. Further, since the four ribs 138 are respectively arranged in the cross direction with the insertion hole 134 as the center, the second spring 60 can be supported in a balanced manner at four points. Thereby, since the position of the second spring 60 in the main frame 20 is not shifted, the electronic pen 3 can perform the above-described pen-up and pen-down operations satisfactorily.

  Moreover, in the said embodiment and a 1st modification, it is preferable to perform a grinding | polishing process in order to make the one end side and other end side of the axial direction of the 2nd spring 60 into a surface orthogonal to an axial direction. For example, as shown in FIG. 10, the one end side of the second spring 60 is polished on one end side and the other end side of the second spring 60 so that the one end side of the second spring 60 is not spaced from the tip end surface 77 of the flange 72 of the spring holder 70. It can be adhered. Furthermore, the other end side can also be brought into close contact with the four ribs 138 without any gap. Thereby, since the position of the axial center of the 2nd spring 60 does not shift | deviate with respect to the refill holder 130, even when compression is repeated, the spring holder 70, the 2nd spring 60, and the refill holder 30 can be arrange | positioned coaxially. Therefore, a predetermined spring force can be continuously applied between the spring holder 70 and the refill holder 130.

  A second modification will be described with reference to FIG. In the said embodiment, although the 2nd spring 60 which is a coil spring is used as a 2nd elastic body of this invention, an O-ring can be used, for example. As shown in FIG. 16, the electronic pen according to the third modification includes a substrate 40, a refill holder 330, a first spring 50, an O-ring 360, a spring holder 370, and the like. The refill holder 330 is the same as the refill holder 30 (see FIG. 5) of the above embodiment, and includes a main body portion 331, a flange portion 332, a holding hole 333, a rear end surface 335, an insertion hole 334, and a stopper 332A. A positioning portion 335 </ b> A formed in a ring shape in plan view is provided at a portion on the radially outer side of the rear end surface 335, which is one step lower than the radially inner side.

  The spring holder 370 is the same as the spring holder 70 (see FIG. 5) of the above-described embodiment, and includes the main body portion 371 but does not include the flange portion. A holding hole 375 is provided in the axial direction inside the main body 371. The holding hole 375 opens to the substrate 40 side, and has a bottom portion 374 on the opposite side. The first spring 50 is accommodated coaxially in the holding hole 375. The main body 371 has a cylindrical protrusion 373 at the center of the outer surface of the bottom 374. The protrusion 373 extends coaxially with the main body 371. The protrusion 373 is loosely inserted into the insertion hole 334 of the refill holder 330. Thereby, the refill holder 330 and the spring holder 370 can be coaxially arranged in the main frame 20.

  The O-ring 360 is formed of silicon as an example, and a O-ring 360 having a reduced diameter φ0.6 and a center radius of 3 mm can be used. The O-ring 360 is disposed and positioned at a positioning portion 335 </ b> A provided on the rear end surface 335 of the refill holder 330. Therefore, the O-ring 360 is disposed between the rear end surface 335 of the refill holder 330 and the outer surface of the bottom portion 374 of the spring holder 370.

  When the electronic pen is in the pen-up state, the first gap 50 is formed between the front end surface 41 of the substrate 40 and the rear end surface 376 of the spring holder 370 by the elastic force of the first spring 50. Furthermore, a second gap Q <b> 2 is formed between the outer surface of the bottom 374 of the main body 371 of the spring holder 370 and the rear end surface 335 of the main body 331 of the refill holder 330 due to the elastic force of the O-ring 360. Further, a third gap R <b> 2 is formed between the edge 22 on the rear end side of the opening 21 of the main frame 20 and the stopper 332 </ b> A of the flange 332 of the refill holder 330.

  As described above, in the pen-up state, the front end 338 of the main body 331 of the refill holder 330 is in contact with the stopper 27 provided on the inner peripheral surface of the main frame 20. Thereby, the refill holder 330 can move relative to the main frame 20 within the range of the axial distance of the third gap R2. In the pen-up state, since the rear end surface 376 of the spring holder 370 is separated from the front end surface 41 of the substrate 40 by the first gap P2, the contact portions 45 and 46 provided on the front end surface 41 do not conduct. Therefore, the electronic circuit provided on the substrate 40 is turned off, so that a predetermined writing signal is not output from the coil 12.

  Next, when the user pens down the pen tip on the writing surface of the paper 120, the substrate 40 fixed to the main frame 20 moves downward as the main frame 20 moves downward. Here, as described above, the elastic force of the first spring 50 is smaller than the elastic force of the O-ring 360. Therefore, the first spring 50 is gradually compressed between the front end surface 41 of the substrate 40 and the rear end surface 376 of the spring holder 370 before the O-ring 360 according to the writing pressure applied to the pen tip.

  When the front end surface 41 of the substrate 40 comes into contact with the rear end surface 376 of the spring holder 370, the contact portions 45 and 46 are conducted through the rear end surface 376 of the spring holder 370. As a result, the electronic circuit provided on the substrate 40 is switched on, and a predetermined writing signal is output from the coil 12.

  Further, when the user applies a load to the writing surface, the substrate 40 moves downward together with the main frame 20, but the front end surface 41 of the substrate 40 and the rear end surface 376 of the spring holder 370 are already in contact with each other. The load is applied to the O-ring 360. Therefore, the O-ring 360 is gradually compressed between the positioning portion 335 </ b> A provided on the rear end surface 335 of the main body portion 331 of the refill holder 330 and the outer surface of the bottom portion 374 of the spring holder 370. At this time, only the reaction force generated when the O-ring 360 is compressed is applied to the contact portions 45 and 46 provided on the front end surface 41 of the substrate 40. Thereby, since the user's writing pressure is not directly applied to the contact portions 45 and 46, the load applied to the contact portions 45 and 46 can be effectively reduced. Since the contact portions 45 and 46 and the rear end surface 376 of the spring holder 370 can be brought into close contact by the reaction force of the O-ring 360, the contact portions 45 and 46 can be reliably connected.

  When the user further applies a load to the writing surface, the substrate 40 moves further downward along with the main frame 20, and the O-ring 360 is further compressed, but the edge 22 of the main frame 20 is refilled. It abuts against the stopper 332 </ b> A of the flange 332 of the holder 330. Therefore, also in the second modification, the user's writing load can be finally received by the stopper 332 </ b> A of the flange portion 332 of the refill holder 30. That is, since the writing load is not directly applied to the front end surface 41 of the substrate 40, the load applied to the contact portions 45 and 46 can be reduced also in the second modification. Further, since the O-ring 360 can effectively apply an elastic force at a relatively small distance compared to the coil spring, the electronic pen can be made compact.

  The spring holder 370 is supported by the O-ring 360 toward the substrate 40 with equal pressure from the periphery. Thereby, for example, when the spring holder 70 is inclined with respect to the substrate 40 or when the substrate 40 is inclined with respect to the spring holder 70, the spring holder 370 is aligned with the front end surface 41 of the substrate 40 by the O-ring 360. Can be automatically aligned. Since the rear end surface 376 can be adhered to the front end surface 41 without any gap, the rear end surface 376 of the spring holder 370 and the contact portions 45 and 46 can be brought into contact with each other on a uniform plane. Accordingly, contact with only one of the contact portions 45 and 46 can be prevented, so that uneven wear and contact failure of the contact portions 45 and 46 can be prevented.

  The present invention can be variously modified in addition to the embodiment and the first and second modifications. For example, in the above embodiment, the refill holder 30 is provided in order to make the refill 15 replaceable. However, for example, the present invention can be applied to a stylus pen. In that case, a core having a shape in which the refill 15 and the refill holder 30 are integrated may be provided.

  Further, in the above embodiment, the pen tip 16 is moved out of the opening 5 of the cover 10 by pushing the knock portion 6. A cap member (not shown) for protecting the cover 10 may be placed on the front end side of the cover 10.

  In the above embodiment, the position of the substrate 40 in the main frame 20 is adjusted by screwing the position adjusting screw 80 into the position adjusting hole 26 from the outside. It may be performed directly inside the frame 20.

  In addition, the information input device 1 and the electronic pen 3 of the above embodiment are based on the electromagnetic induction method, but may be an ultrasonic detection method, a laser detection method, or the like.

DESCRIPTION OF SYMBOLS 1 Information input device 3 Electronic pen 5 Opening 10 Cover 12 Coil 15 Refill 16 Pen tip 20 Main frame 22 Edge 30 Refill holder 31 Main body part 32 Gutter part 40 Substrate 41 Tip surface 45, 46 Contact part 50 First spring 60 Second Spring 70 Spring holder 71 Body portion 72 Gutter portion 130 Refill holder 137 Inclined surface 138 Rib 330 Refill holder 360 O-ring

Claims (7)

A position indicator that outputs a detection signal from a signal output means built in the housing and indicates a position close to a position detection device that detects the detection signal,
An outer cylinder provided in the housing and having at least one end as an open end;
A core part that is held movably in the outer cylinder and projects its tip part from the opening end;
A substrate having a plurality of contact portions of an electronic circuit disposed on the other end side opposite to the opening end side in the outer cylinder and outputting the detection signal to the end surface on the opening end side;
It has electrical conductivity, is arranged between the substrate and the core body part, and is provided on and away from the end surface on the axis of the outer cylinder, by contacting the end surface, A conducting member for conducting a plurality of contact portions with each other;
A first elastic body that is disposed between the substrate and the conductive member and separates the end surface of the substrate and the conductive member;
A second elastic body disposed between the core body part and the conducting member, and separating the core body part and the conducting member from each other;
The position indicator, wherein the second elastic body is in contact with the conducting member at four points that are positions in a cross direction centered on at least the center of the conducting member.   The position indicator according to claim 1, wherein the second elastic body is a ring-shaped elastic body.   The position indicator according to claim 2, wherein the second elastic body is a coil spring. The conducting member is
A cylindrical portion having a bottomed cylindrical shape;
A collar portion extending radially outward from one end portion of the cylindrical portion that opens,
The first elastic body is held in the cylindrical portion,
The said 2nd elastic body inserts the said cylindrical part of the said conduction member inside, and is arrange | positioned between the said collar part and the said core part, The Claim 2 or 3 characterized by the above-mentioned. Position indicator. The core part is
A cylindrical pen-shaped core,
A cylindrical core holder that holds the pen-shaped core on one end side;
The second elastic body is disposed between the conducting member and the other end opposite to the one end of the core holder,
The corner of the other end of the core holder is formed in a taper shape,
Ribs are respectively provided in the corners at positions in the cross direction around the axis of the core holder,
One end of the second elastic body on the core holder side contacts with the four ribs provided on the other end of the core holder. The position indicator described in.   The portion of the second elastic body that comes into contact with the conducting member or the core portion is polished in a plane perpendicular to the axial direction of the second elastic body. The position indicator according to any one of 5.   The position indicator according to any one of claims 2 to 6, wherein the second elastic body is an O-ring.

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