JP2016010884A - Cap for pencil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow a touch pen to be achieved inexpensively and easily by allowing a commercially-available pencil to be generally used as the touch pen.SOLUTION: A cap 10 for a pencil, which can be used as a pen nib of an electrostatic capacitance-type touch pen by being installed in a pencil 20, comprises a cylindrical body 11 that can be externally fitted to the pencil 20 and a conductive member 15 that is attached to a tip of the cylindrical body 11. The conductive member 15 comprises a contact part 17 exposed to outside of the cylindrical body 11 and a core receiving part 16 that is inserted through inside of the cylindrical body 11. The core receiving part 16 can bury and hold a protruded lead 21 of the pencil 20.

Description

  The present invention relates to a pencil cap used by being attached to the tip of a pencil.

  2. Description of the Related Art Conventionally, products in which writing instruments such as mechanical pencils and ballpoint pens can be used as touch pens are known (see, for example, Patent Document 1). In such a conventional product, a stylus tip or the like is provided at the tip of a writing instrument, and the touch panel sensor can sense an operation by bringing the stylus tip into contact with the touch panel.

JP 2003-312190 A

  By the way, many of the touch panels used in recent years are capacitive. A touch pen compatible with such a capacitive touch panel must change the capacitance on the surface of the touch panel when it is brought into contact with the touch panel.

  For example, in order to make the touch pen described in Patent Document 1 compatible with the capacitance type, it is necessary to change the capacitance on the surface of the touch panel with the human body having the writing tool as the ground. Specifically, the main body of the writing instrument must be formed of a conductive material such as metal, and an energization path from the stylus tip to the human body must be ensured.

  For this reason, in the conventional product, it was necessary to manufacture a writing instrument on the assumption that it would be used as a touch pen, and there was a problem that the material was restricted and various costs were increased.

  The present invention has been made by paying attention to the above points, and by making it possible to use a writing instrument that is not supposed to be used as a touch pen, for example, a generally commercially available pencil, as a touch pen, It is an object to be able to obtain a touch pen inexpensively and easily.

  The present invention has been made to solve the above-described problems, and is characterized by the following.

  The invention according to claim 1 is a pencil cap that can be used as a pen tip of a capacitive touch pen by being attached to a pencil, and a cylindrical body that can be externally mounted on the pencil, and a tip of the cylindrical body A conductive member attached to the cylindrical body, and the conductive member includes a contact portion exposed to the outside of the cylindrical body, and a core receiving portion inserted into the cylindrical body. The receiving portion is characterized in that the protruding pencil core can be buried and held.

  The invention described in claim 2 is characterized in that, in addition to the feature of the invention described in claim 1, the core receiving portion is formed of a conductive felt material.

  The invention according to claim 1 is as described above, and includes a cylindrical body that can be externally mounted on a pencil, and a conductive member attached to a tip of the cylindrical body, and the conductive member is the cylindrical shape. A contact portion exposed to the outside of the body and a core receiving portion inserted into the cylindrical body are provided, and the core receiving portion can hold the protruding pencil core embedded therein.

  According to such a configuration, since the pencil lead is buried in the lead receiving portion, the conductive member and the pencil lead are in contact with each other so as to be energized. In this state, when the contact portion exposed to the outside is brought into contact with the surface of the touch panel, the electrode of the touch panel, the conductive member, and the pencil lead are electrically connected, so that a change in capacitance occurs. Touch is detected.

  In addition, when the inventor conducted an experiment with a touch panel of a mobile phone or the like, a touch was not detected even if the pencil core was directly contacted with the touch panel, but a conductive member was attached to the tip of the pencil core as in the present invention. In case the touch was detected. Since the control method and sensitivity setting of the touch panel used in the experiment are unknown, the reason why such an experimental result was obtained is not clear, but it is assumed that a general touch panel is operated by a human finger. Therefore, it is considered that a certain contact area is required to detect a touch, and that the touch area is increased by touching the touch panel through the conductive member, so that the touch is easily detected.

  In addition, when a conductive member is attached to the tip of a metal such as a pen tip, a touch is not detected unless the human body is grounded, but when a conductive member is attached to the tip of a pencil lead as in the present invention. Found that the touch could be detected without grounding the human body. The reason for this experimental result is not clear, but the capacitance of the pencil may have changed sufficiently even if the human body is not grounded because the pencil core has very high conductivity.

  From the results of these experiments, the present inventor has discovered that a writing instrument that is generally commercially available can be used as a touch pen by attaching a conductive member to the tip of a pencil lead, and makes the present invention. Has been reached.

As described above, since the pencil can be used as a capacitive touch pen by simply attaching a pencil cap to a commercially available pencil, the touch pen can be obtained inexpensively and easily.
Further, since the core receiving portion can hold the pencil core embedded, the core receiving portion can serve as a cushion, and the pencil core breakage can be effectively prevented.

  The core receiving portion may be formed of conductive rubber, conductive sponge, or the like, but is preferably formed of a conductive felt material. If the core receiving part is made of conductive felt material, the felt material wraps the pencil core in accordance with the shape of the pencil core, so even if the pencil thickness or how to sharpen is slightly different, A pencil lead can be brought into contact. Further, since the felt material can be easily repaired and closed even if there is a hole, it is suitable for repeated use.

It is a figure which shows a mode that a cap for pencils is attached to a pencil, Comprising: (a) The figure before attachment, (b) The figure after attachment. It is a figure which shows the structure of the cap for pencils, Comprising: (a) The figure of the state which removed the electroconductive member from the cylindrical body, (b) The figure of the state which attached the electroconductive member to the cylindrical body. It is a figure for demonstrating the inside of the cap for pencils when the cap for pencils is attached to the pencil. It is a figure of the state which uses the pencil which attached the cap for pencils as a touch pen. It is a figure which concerns on a modification, Comprising: It is a figure for demonstrating the inside of the cap for pencils when the cap for pencils is attached to the pencil.

  Embodiments of the present invention will be described with reference to the drawings.

  The pencil cap 10 according to the present embodiment can be used as a nib of a capacitive touch pen by being attached to the pencil 20, and as shown in FIG. Attached to the tip. By attaching to the tip of the pencil 20 in this manner, the protruding core 21 can be protected and the body or the like can be prevented from being damaged by the sharp core 21 as in the conventional pencil cap. Yes.

  As shown in FIG. 2, the pencil cap 10 includes a cylindrical body 11 that can be externally mounted on the pencil 20, and a conductive member 15 that is attached to the tip of the cylindrical body 11.

The cylindrical body 11 is formed with an inner diameter into which the pencil 20 can be inserted. In addition, the material of the cylindrical body 11 is not specifically limited. A metal, a synthetic resin, etc. may be sufficient and rubber | gum etc. may be sufficient. Moreover, it is not necessary to form with an electroconductive material. However, in order to make it easy to confirm whether or not the core 21 of the pencil 20 is in contact with the core receiving portion 16 described later, the cylindrical body 11 may be made transparent or translucent so that the inside can be visually recognized. desirable.
The conductive member 15 includes a contact portion 17 exposed to the outside of the cylindrical body 11 and a core receiving portion 16 that is inserted into the cylindrical body 11.

  The contact portion 17 is provided so as to close the opening on one side of the cylindrical body 11, and is provided so as to protrude slightly in the distal direction from the cylindrical body 11. This contact part 17 is a part which contacts a touch panel as a front-end | tip of a touch pen, when using the pencil 20 with which the cap 10 for pencils was used as a touch pen.

  The core receiving portion 16 is a portion inserted into the cylindrical body 11. As shown in FIG. 3, the core receiving portion 16 is configured to embed and hold the protruding core 21 of the pencil 20 when the pencil cap 10 is attached to the pencil 20. In the present embodiment, since the conductive member 15 is formed of a conductive felt material, when the pencil cap 10 is attached to the pencil 20, the core 21 of the protruding pencil 20 is stuck and held in the felt. It has become so.

  One end of the core receiving portion 16 is provided with the contact portion 17 described above, and when the core receiving portion 16 is inserted into the cylindrical body 11, the contact portion 17 is exposed to the outside of the cylindrical body 11. It is like that.

  Note that the conductive member 15 according to the present embodiment is detachable from the cylindrical body 11 so that the conductive member 15 can be maintained when the conductive member 15 is worn. For example, if the core 21 of the pencil 20 continues to pierce the core receiving portion 16 and a hole is opened in the core receiving portion 16, and the hole has expanded, the conductive member 15 is once removed to loosen the felt material. If done, the hole can be made smaller. Further, when the wear of the core receiving portion 16 is severe, it can be replaced with a different conductive member 15.

  As a specific method for attaching the conductive member 15 to the cylindrical body 11, various methods are conceivable. In the present embodiment, as shown in FIG. 2, the conductive member 15 is press-fitted and attached by tightly pushing the conductive member 15 into the cylindrical body 11 using the elastic deformation of the core receiving portion 16. In addition, for example, an adhesive means such as a double-sided tape may be provided on a portion of the conductive member 15 that contacts the cylindrical body 11 and attached by this adhesive means. Alternatively, the conductive member 15 and the cylindrical body 11 may be provided with a concave / convex shape that fits each other, and the concave / convex shape may be fitted.

  According to such a pencil cap 10, since the lead 21 of the pencil 20 is buried in the lead receiving part 16, the conductive member 15 and the lead 21 of the pencil 20 are in contact with each other so as to be energized. . In this state, when the contact portion 17 exposed to the outside is brought into contact with the surface of the touch panel, the electrode of the touch panel and the conductive member 15 and the core 21 of the pencil 20 are electrically connected. A change occurs and a touch is detected.

  As shown in FIG. 4, the pencil 20 can be used as a capacitive touch pen as shown in FIG. 4 simply by attaching the pencil cap 10 to the pencil 20 that is generally commercially available. You can easily get a touch pen.

  Moreover, since the core receiving part 16 can embed and hold the core 21 of the pencil 20, the core receiving part 16 can serve as a cushion and can effectively prevent the core 21 of the pencil 20 from being broken.

  The core receiving portion 16 may be formed of conductive rubber, conductive sponge, or the like, but is preferably formed of a conductive felt material. If the core receiving part 16 is formed of a conductive felt material, the felt material wraps around the core 21 of the pencil 20 in accordance with the shape of the core 21 of the pencil 20, so even if the thickness of the pencil 20 and the way of cutting are slightly different, The lead receiving part 16 and the lead 21 of the pencil 20 can be reliably brought into contact with each other. Further, since the felt material can be easily repaired and closed even if there is a hole, it is suitable for repeated use. The felt material referred to here means a material in which fibers are entangled and compressed, and may be derived from an animal, a plant, or a chemical fiber. May be.

  In the present embodiment, the conductive member 15 is formed of a felt material. However, the embodiment of the present invention is not limited to this. For example, the conductive member 15 may be formed of conductive rubber, conductive sponge, or the like. Further, the core receiving part 16 and the contact part 17 may be formed of different materials. For example, the core receiving portion 16 may be formed of conductive rubber, and the contact portion 17 may be formed of a conductive felt material.

  Further, although not particularly illustrated, the inside of the cylindrical body 11 may be gradually reduced in diameter toward the back. In this way, by inserting the pencil 20 into the inner peripheral portion that is reduced in diameter, the crown depth of the pencil cap 10 to the pencil 20 can be adjusted in the same manner as a conventional pencil cap. Good.

  Further, instead of gradually reducing the inside diameter of the cylindrical body 11, or in addition to gradually reducing the inside diameter of the cylindrical body 11, as shown in FIG. You may provide the control part 12 for controlling insertion of the pencil 20. FIG. The restricting portion 12 may be provided as, for example, a protrusion protruding inside the cylindrical body 11 so as to abut on the cutting slope 22 of the pencil 20. Thus, if the control part 12 is provided, the positional relationship of the core receiving part 16 and the core 21 of the pencil 20 can be made appropriate. That is, the problem that the lead 21 of the pencil 20 does not reach the lead receiving part 16 or the lead 21 of the pencil 20 is stuck too much into the lead receiving part 16 can be made difficult to occur.

  The pencil 20 to which the pencil cap 10 is attached is not limited to the general type of pencil 20 that sharpens the tip. For example, a pencil cap 10 according to this embodiment may be covered with a so-called rocket pencil, or a pencil cap 10 according to this embodiment may be covered with a mechanical pencil having a thick core. .

DESCRIPTION OF SYMBOLS 10 Cap for pencil 11 Cylindrical body 12 Control part 15 Conductive member 16 Core receiving part 17 Contact part 20 Pencil 21 Core 22 Cutting slope

  The present invention relates to a pencil cap used by being attached to the tip of a pencil.

  2. Description of the Related Art Conventionally, products in which writing instruments such as mechanical pencils and ballpoint pens can be used as touch pens are known (see, for example, Patent Document 1). In such a conventional product, a stylus tip or the like is provided at the tip of a writing instrument, and the touch panel sensor can sense an operation by bringing the stylus tip into contact with the touch panel.

JP 2003-312190 A

  By the way, many of the touch panels used in recent years are capacitive. A touch pen compatible with such a capacitive touch panel must change the capacitance on the surface of the touch panel when it is brought into contact with the touch panel.

  For example, in order to make the touch pen described in Patent Document 1 compatible with the capacitance type, it is necessary to change the capacitance on the surface of the touch panel with the human body having the writing tool as the ground. Specifically, the main body of the writing instrument must be formed of a conductive material such as metal, and an energization path from the stylus tip to the human body must be ensured.

  For this reason, in the conventional product, it was necessary to manufacture a writing instrument on the assumption that it would be used as a touch pen, and there was a problem that the material was restricted and various costs were increased.

  The present invention has been made by paying attention to the above points, and by making it possible to use a writing instrument that is not supposed to be used as a touch pen, for example, a generally commercially available pencil, as a touch pen, It is an object to be able to obtain a touch pen inexpensively and easily.

  The present invention has been made to solve the above-described problems, and is characterized by the following.

The invention according to claim 1 is a pencil cap that can be used as a pen tip of a capacitive touch pen by being attached to a pencil, and a cylindrical body that can be externally mounted on the pencil, and a tip of the cylindrical body A conductive member attached to the cylindrical body, and the conductive member includes a contact portion exposed to the outside of the cylindrical body, and a core receiving portion inserted into the cylindrical body. receiving part, Ri holdable der by burying a pencil lead that protrudes, when wearing the pencil cap pencil, and wherein Rukoto core protruding pencil is held pierced in the core receiving portion To do.

  The invention described in claim 2 is characterized in that, in addition to the feature of the invention described in claim 1, the core receiving portion is formed of a conductive felt material.

The invention according to claim 1 is as described above, and includes a cylindrical body that can be externally mounted on a pencil, and a conductive member attached to a tip of the cylindrical body, and the conductive member is the cylindrical shape. includes a contact portion exposed to the outside of the body, a core receiving portion to be inserted into the interior of the tubular body, wherein the core receiving portion, Ri holdable der by burying a core protruding pencil, pencil when mounting the use cap pencil, Ru held core protruding pencil is stuck to the core receiving portion.

  According to such a configuration, since the pencil lead is buried in the lead receiving portion, the conductive member and the pencil lead are in contact with each other so as to be energized. In this state, when the contact portion exposed to the outside is brought into contact with the surface of the touch panel, the electrode of the touch panel, the conductive member, and the pencil lead are electrically connected, so that a change in capacitance occurs. Touch is detected.

  In addition, when the inventor conducted an experiment with a touch panel of a mobile phone or the like, a touch was not detected even if the pencil core was directly contacted with the touch panel, but a conductive member was attached to the tip of the pencil core as in the present invention. In case the touch was detected. Since the control method and sensitivity setting of the touch panel used in the experiment are unknown, the reason why such an experimental result was obtained is not clear, but it is assumed that a general touch panel is operated by a human finger. Therefore, it is considered that a certain contact area is required to detect a touch, and that the touch area is increased by touching the touch panel through the conductive member, so that the touch is easily detected.

  In addition, when a conductive member is attached to the tip of a metal such as a pen tip, a touch is not detected unless the human body is grounded, but when a conductive member is attached to the tip of a pencil lead as in the present invention. Found that the touch could be detected without grounding the human body. The reason for this experimental result is not clear, but the capacitance of the pencil may have changed sufficiently even if the human body is not grounded because the pencil core has very high conductivity.

  From the results of these experiments, the present inventor has discovered that a writing instrument that is generally commercially available can be used as a touch pen by attaching a conductive member to the tip of a pencil lead, and makes the present invention. Has been reached.

As described above, since the pencil can be used as a capacitive touch pen by simply attaching a pencil cap to a commercially available pencil, the touch pen can be obtained inexpensively and easily.
Further, since the core receiving portion can hold the pencil core embedded, the core receiving portion can serve as a cushion, and the pencil core breakage can be effectively prevented.

  The core receiving portion may be formed of conductive rubber, conductive sponge, or the like, but is preferably formed of a conductive felt material. If the core receiving part is made of conductive felt material, the felt material wraps the pencil core in accordance with the shape of the pencil core, so even if the pencil thickness or how to sharpen is slightly different, A pencil lead can be brought into contact. Further, since the felt material can be easily repaired and closed even if there is a hole, it is suitable for repeated use.

It is a figure which shows a mode that a cap for pencils is attached to a pencil, Comprising: (a) The figure before attachment, (b) The figure after attachment. It is a figure which shows the structure of the cap for pencils, Comprising: (a) The figure of the state which removed the electroconductive member from the cylindrical body, (b) The figure of the state which attached the electroconductive member to the cylindrical body. It is a figure for demonstrating the inside of the cap for pencils when the cap for pencils is attached to the pencil. It is a figure of the state which uses the pencil which attached the cap for pencils as a touch pen. It is a figure which concerns on a modification, Comprising: It is a figure for demonstrating the inside of the cap for pencils when the cap for pencils is attached to the pencil.

  Embodiments of the present invention will be described with reference to the drawings.

  The pencil cap 10 according to the present embodiment can be used as a nib of a capacitive touch pen by being attached to the pencil 20, and as shown in FIG. Attached to the tip. By attaching to the tip of the pencil 20 in this manner, the protruding core 21 can be protected and the body or the like can be prevented from being damaged by the sharp core 21 as in the conventional pencil cap. Yes.

  As shown in FIG. 2, the pencil cap 10 includes a cylindrical body 11 that can be externally mounted on the pencil 20, and a conductive member 15 that is attached to the tip of the cylindrical body 11.

The cylindrical body 11 is formed with an inner diameter into which the pencil 20 can be inserted. In addition, the material of the cylindrical body 11 is not specifically limited. A metal, a synthetic resin, etc. may be sufficient and rubber | gum etc. may be sufficient. Moreover, it is not necessary to form with an electroconductive material. However, in order to make it easy to confirm whether or not the core 21 of the pencil 20 is in contact with the core receiving portion 16 described later, the cylindrical body 11 may be made transparent or translucent so that the inside can be visually recognized. desirable.
The conductive member 15 includes a contact portion 17 exposed to the outside of the cylindrical body 11 and a core receiving portion 16 that is inserted into the cylindrical body 11.

  The contact portion 17 is provided so as to close the opening on one side of the cylindrical body 11, and is provided so as to protrude slightly in the distal direction from the cylindrical body 11. This contact part 17 is a part which contacts a touch panel as a front-end | tip of a touch pen, when using the pencil 20 with which the cap 10 for pencils was used as a touch pen.

  The core receiving portion 16 is a portion inserted into the cylindrical body 11. As shown in FIG. 3, the core receiving portion 16 is configured to embed and hold the protruding core 21 of the pencil 20 when the pencil cap 10 is attached to the pencil 20. In the present embodiment, since the conductive member 15 is formed of a conductive felt material, when the pencil cap 10 is attached to the pencil 20, the core 21 of the protruding pencil 20 is stuck and held in the felt. It has become so.

  One end of the core receiving portion 16 is provided with the contact portion 17 described above, and when the core receiving portion 16 is inserted into the cylindrical body 11, the contact portion 17 is exposed to the outside of the cylindrical body 11. It is like that.

  Note that the conductive member 15 according to the present embodiment is detachable from the cylindrical body 11 so that the conductive member 15 can be maintained when the conductive member 15 is worn. For example, if the core 21 of the pencil 20 continues to pierce the core receiving portion 16 and a hole is opened in the core receiving portion 16, and the hole has expanded, the conductive member 15 is once removed to loosen the felt material. If done, the hole can be made smaller. Further, when the wear of the core receiving portion 16 is severe, it can be replaced with a different conductive member 15.

  As a specific method for attaching the conductive member 15 to the cylindrical body 11, various methods are conceivable. In the present embodiment, as shown in FIG. 2, the conductive member 15 is press-fitted and attached by tightly pushing the conductive member 15 into the cylindrical body 11 using the elastic deformation of the core receiving portion 16. In addition, for example, an adhesive means such as a double-sided tape may be provided on a portion of the conductive member 15 that contacts the cylindrical body 11 and attached by this adhesive means. Alternatively, the conductive member 15 and the cylindrical body 11 may be provided with a concave / convex shape that fits each other, and the concave / convex shape may be fitted.

  According to such a pencil cap 10, since the lead 21 of the pencil 20 is buried in the lead receiving part 16, the conductive member 15 and the lead 21 of the pencil 20 are in contact with each other so as to be energized. . In this state, when the contact portion 17 exposed to the outside is brought into contact with the surface of the touch panel, the electrode of the touch panel and the conductive member 15 and the core 21 of the pencil 20 are electrically connected. A change occurs and a touch is detected.

  As shown in FIG. 4, the pencil 20 can be used as a capacitive touch pen as shown in FIG. 4 simply by attaching the pencil cap 10 to the pencil 20 that is generally commercially available. You can easily get a touch pen.

  Moreover, since the core receiving part 16 can embed and hold the core 21 of the pencil 20, the core receiving part 16 can serve as a cushion and can effectively prevent the core 21 of the pencil 20 from being broken.

  The core receiving portion 16 may be formed of conductive rubber, conductive sponge, or the like, but is preferably formed of a conductive felt material. If the core receiving part 16 is formed of a conductive felt material, the felt material wraps around the core 21 of the pencil 20 in accordance with the shape of the core 21 of the pencil 20, so even if the thickness of the pencil 20 and the way of cutting are slightly different, The lead receiving part 16 and the lead 21 of the pencil 20 can be reliably brought into contact with each other. Further, since the felt material can be easily repaired and closed even if there is a hole, it is suitable for repeated use. The felt material referred to here means a material in which fibers are entangled and compressed, and may be derived from an animal, a plant, or a chemical fiber. May be.

  In the present embodiment, the conductive member 15 is formed of a felt material. However, the embodiment of the present invention is not limited to this. For example, the conductive member 15 may be formed of conductive rubber, conductive sponge, or the like. Further, the core receiving part 16 and the contact part 17 may be formed of different materials. For example, the core receiving portion 16 may be formed of conductive rubber, and the contact portion 17 may be formed of a conductive felt material.

  Further, although not particularly illustrated, the inside of the cylindrical body 11 may be gradually reduced in diameter toward the back. In this way, by inserting the pencil 20 into the inner peripheral portion that is reduced in diameter, the crown depth of the pencil cap 10 to the pencil 20 can be adjusted in the same manner as a conventional pencil cap. Good.

  Further, instead of gradually reducing the inside diameter of the cylindrical body 11, or in addition to gradually reducing the inside diameter of the cylindrical body 11, as shown in FIG. You may provide the control part 12 for controlling insertion of the pencil 20. FIG. The restricting portion 12 may be provided as, for example, a protrusion protruding inside the cylindrical body 11 so as to abut on the cutting slope 22 of the pencil 20. Thus, if the control part 12 is provided, the positional relationship of the core receiving part 16 and the core 21 of the pencil 20 can be made appropriate. That is, the problem that the lead 21 of the pencil 20 does not reach the lead receiving part 16 or the lead 21 of the pencil 20 is stuck too much into the lead receiving part 16 can be made difficult to occur.

  The pencil 20 to which the pencil cap 10 is attached is not limited to the general type of pencil 20 that sharpens the tip. For example, a pencil cap 10 according to this embodiment may be covered with a so-called rocket pencil, or a pencil cap 10 according to this embodiment may be covered with a mechanical pencil having a thick core. .

DESCRIPTION OF SYMBOLS 10 Cap for pencil 11 Cylindrical body 12 Control part 15 Conductive member 16 Core receiving part 17 Contact part 20 Pencil 21 Core 22 Cutting slope

Claims (2)

A pencil cap that can be used as a nib for a capacitive touch pen when attached to a pencil,
A cylindrical body that can be externally mounted on a pencil;
A conductive member attached to the tip of the cylindrical body;
With
The conductive member includes a contact portion exposed to the outside of the cylindrical body, and a core receiving portion inserted into the cylindrical body,
The pencil holder is characterized in that the core receiving portion can hold a protruding pencil core embedded therein.   The pencil cap according to claim 1, wherein the core receiving portion is formed of a conductive felt material.

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