JP2004120097A - Receiver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a receiver that performs no communication even when an operation switch of the receiver is unintendedly touched but performs communication after the operation switch is first intendedly operated by a prescribed amount. <P>SOLUTION: An engine start switch 14 acting like the operation switch is provided with a box type push switch 17 and an electrode 12. The push switch 17 is energized by a spring so as to return to its operating face even when a user depresses the push switch 17. The electrode 12 is made of a metal and located on a depressed face (operating face) 17a of the push switch 17. There are structures of an electrode 12a which is formed to be a mesh on almost the entire area of the operating face 17a of the push switch 17 and a letter type electrode 12b which is formed to be letters on the area of the operating face 17a of the push switch 17 as the structure of the electrode 12. When the user depresses the push switch 17 in a contact state with the electrodes 12, the user is identified and collated, and when the user is authenticated for the personal identification, the start of an engine is attained. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
According to the present invention, when a user wearing a portable device operates an operation switch with a part of a body (for example, a finger of a hand), communication (biological communication) with the portable device using the body as a transmission line is performed. About the machine.
[0002]
[Prior art]
2. Description of the Related Art In recent years, a communication system has been proposed in which communication (biological communication) is performed between a portable device mounted on a body and a communication device using a small current flowing through the body using the body as a medium (transmission line). A communication device used in this type of communication system has a receiver provided with an electrode that a user touches when communicating. When a user who wears the portable device with its electrodes touching the skin touches the electrodes on the receiver side, biological communication using the body as a transmission line between the communication device and the portable device becomes possible (for example, see Patent Reference 1). For example, when applied to a keyless system of an automobile, it is conceivable to provide an engine start switch (push switch) as an operation switch of the receiver at a predetermined location in front of the driver's seat of the automobile. In this case, by touching an electrode provided on the operation surface of the engine start switch, biometric communication is performed between the communication device and the portable device, the ID code is collated by the biometric communication, and the ID code is registered with the registration code. If the identity is confirmed in accordance with the above, the engine is allowed to start. A keyless system is conceivable in which the engine is started when the engine start switch is operated by a predetermined amount.
[0003]
[Patent Document 1]
JP-A-2002-00710 (Pages 4-9, FIG. 3)
[0004]
[Problems to be solved by the invention]
By the way, in a system in which a predetermined operation such as engine start is permitted only when the person (vehicle owner or the like) wearing the portable device operates the push switch of the receiver, and the engine is started only when the person operates the push switch. More preferably, there is. However, in the above example, when the user touches the electrode, the ID collation is performed by the biometric communication. Therefore, even if the user simply touches the push switch without intentional operation, the ID collation by the biometric communication is performed and the engine start is permitted. I am worried. After that, even if another person who does not wear the portable device operates the push switch, the engine starts. Although this is considered to be a rare case that is unlikely to occur, it is desirable that only the person can start the engine from the viewpoint of theft prevention. Therefore, there is a demand for a keyless system that is perfect for such rare cases.
[0005]
The present invention has been made in order to solve the above-described problem, and an object of the present invention is to perform a predetermined amount of operation by intentionally operating the operation switch even if the operation switch of the receiver is touched unintentionally. It is another object of the present invention to provide a receiver in which communication is performed only after receiving the information.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the invention according to claim 1 includes a part of the body via an operation switch and an electrode that contacts the part of the operated body when the operation switch is operated by a predetermined amount. A mechanism for electrically connecting the portable device with the communication means, and a user wearing the portable device in a state where the electrode is in contact with the skin operates the operation switch by a predetermined amount, and a part of the body operated by the user through the electrode. When the communication means is electrically connected to the portable device, ID verification is performed between the portable device and the communication means by biometric communication using the body as a transmission line. The gist of the communication means is to output a signal for permitting execution of the predetermined operation to the control means.
[0007]
According to the present invention, when the user wearing the portable device operates the operation switch by a predetermined amount, biological communication with the communication means on the other side is performed via the electrode that comes into contact with a part of the operated body. Therefore, unlike the case where the biological communication is performed simply by touching the electrodes, the biological communication is performed only when the user intentionally operates the operation surface of the operation switch by a predetermined amount.
[0008]
The invention according to claim 2 is an operation switch, an electrode provided on an operation surface of the operation switch, and the electrode and the communication means side when the operation switch is operated by a predetermined amount while touching the electrode. And a mechanism for electrically connecting the terminal of the portable device and the communication device between the portable device and the communication means when the user wears the portable device in a state where the electrode is in contact with the skin, operates the operation switch by a predetermined amount The gist is that ID verification is performed by biometric communication using the body as a transmission line, and if the ID is verified by the ID verification, the communication unit outputs a signal for permitting execution of a predetermined operation to the control unit.
[0009]
According to the present invention, biological communication is performed by a user wearing the portable device operating a predetermined amount while touching an electrode provided on the operation surface of the operation switch. For example, when an electrode is arranged on a surface (operation surface) on which a push switch is pressed, biological communication is performed by pressing the push switch while touching the electrode of the push switch. Therefore, communication is performed only when a predetermined amount of operation is performed while intentionally touching the electrode on the operation surface of the operation switch. Further, since the electrodes are provided on the operation surface, the contact pressure between the body and the electrodes can be improved.
[0010]
The invention according to claim 3 includes an operation switch and a mechanism provided such that when the operation switch is operated by a predetermined amount by touching the operation surface, a part of the operated body touches the electrode on the communication means side. When the user who wears the portable device with the electrode in contact with the skin operates the operation surface of the operation switch by a predetermined amount and a part of the operated body contacts the electrode on the communication means side, the portable device ID verification is performed by biometric communication using the body as a transmission line between the communication means and the communication means, and if the identity is confirmed by the ID verification, the communication means outputs a signal permitting execution of a predetermined operation to the control means. The point is to do.
[0011]
According to the present invention, when the user wearing the portable device operates the operation switch by a predetermined amount, a part of the body can touch the electrode. Therefore, when the operation switch is not operated, it is difficult to touch the electrodes. Therefore, it is possible to reduce the user's unintended touch on the electrodes, and communication is performed only when the operation switch is intentionally operated by a predetermined amount.
[0012]
According to a fourth aspect of the present invention, in the receiver according to the third aspect, the mechanism includes a hole formed in a part of an operation surface of the operation switch, and a mechanism configured to touch the operation switch with the operation surface. The gist of the present invention is to include the electrode provided so as to be exposed from the hole according to operation / release of the operation switch so as to be exposed on the operation surface from the hole when the fixed amount operation is performed.
[0013]
According to the present invention, when the user wearing the portable device touches the operation surface of the operation switch and operates it by a predetermined amount, the electrode provided to be able to protrude and retract from the hole formed in the operation surface is exposed on the operation surface. I do. Then, the user can perform biological communication by touching the electrodes. For this reason, unless the user operates, the electrode is in a position immersed from the operation surface, and it is difficult for the user to touch the electrode. Therefore, unintended contact with the electrodes can be reduced, and communication is performed only when the operation switch is intentionally operated by a predetermined amount.
[0014]
According to a fifth aspect of the present invention, in the receiver according to the fourth aspect, the mechanism forms the operation surface and has a protection member made of an elastic material having a cut in a portion corresponding to the electrode; The gist is such that when the switch is operated by a predetermined amount, the cut of the protection member is opened and the electrode is exposed on the operation surface.
[0015]
According to the present invention, when the user wearing the portable device operates the operation surface of the operation switch by a predetermined amount, the electrode is exposed on the operation surface from the cutout of the elastic material protection member formed on the operation surface. For this reason, unless the operation is performed, the electrode is usually covered with the protective member. Therefore, it is possible to prevent the user from unintentionally touching the terminal, and communication is performed only when the operation switch is intentionally operated by a predetermined amount.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
(1st Embodiment)
A first embodiment in which the present invention is embodied in a receiver using an engine start switch used as an operation switch in a keyless system (remote key system) in a vehicle will be described with reference to FIGS.
[0017]
As shown in FIG. 1, the keyless system KLS includes a portable device 1 and a communication device 11 provided as a communication unit provided in a vehicle. The communication device 11 includes an engine start switch 14 provided in front of the driver's seat of the vehicle. When the user touches the electrode 12 of the engine start switch 14 provided in the vehicle with the portable device 1 attached to the body, the communication circuit 2 between the portable device 1 and the communication device 11 uses the user's body as a transmission line. It is formed.
[0018]
This communication circuit 2 forms an electrostatic field circuit in the present embodiment. The portable device 1 has a communication electrode 3 and a reference potential electrode 4. One communication device 11 also has a communication electrode 12 and a reference potential electrode 13. The reference potential electrodes 4 and 13 are both grounded to the earth ground, and have the same potential (ground potential). The electrode 12 of the communication device 11 is a kind of capacitor having a two-electrode structure. The outer electrode is charged to the same potential as the communication electrode 12 when touched by the user's body, and the outer electrode is coupled to the outer electrode. And an inner electrode. Communication between the portable device 1 and the communication device 11 using the body as a transmission line is performed through the electrostatic field coupling of the electrodes 12. The signal used in this communication is, for example, a pulse signal of a predetermined frequency.
[0019]
FIGS. 2A and 2B are perspective views of the engine start switch 14. As shown in these figures, the engine start switch 14 includes a push switch 17 and an electrode 12 made of a box-shaped resin. The push switch 17 is urged by a spring S (see FIG. 3) so that the push switch 17 returns to the operation surface 17a side even when pressed by the user. The electrode 12 is made of metal, and is disposed on a surface (operation surface) 17 a of the push switch 17 that is pressed. As a structure of the electrode 12, as shown in FIG. 2A, a structure in which a mesh is formed over substantially the entire operation surface 17a of the push switch 17 is exemplified. According to this structure, when the user presses the push switch 17, the user can press the push switch 17 in such a manner that his or her fingertips sink into the electrode 12a, and the degree of contact between the fingertip and the electrode 12a can be improved. Further, since the electrode 12a is formed on the operation surface 17a of the push switch 17 and pressed with the fingertip, the contact pressure between the fingertip and the electrode 12a can be improved.
[0020]
Further, as shown in FIG. 2B, on the operation surface 17a of the push switch 17, a structure such as a character-shaped electrode 12b formed in the shape of a character may be used. Also in this case, the character electrode 12b is made of metal. In the present embodiment, the character-shaped electrode 12b is formed in the shape of the character “START”. According to this structure, since it is in the form of “START”, it can be recognized as the engine start switch 14 at a glance. In addition, since the character-type electrode 12b is formed on the operation surface 17a of the push switch 17 and pressed with a fingertip, the contact pressure can be improved.
[0021]
FIG. 3 is an electrical configuration diagram of the portable device 1 and the communication device 11. The portable device 1 includes a communication board 5 together with the electrodes 3 and 4. The communication board 5 includes a microcomputer (hereinafter referred to as a body-side microcomputer) 6 and a communication circuit 7. The body-side microcomputer 6 has a memory 6a, in which an ID code unique to the vehicle owned by the user is stored.
[0022]
The body-side microcomputer 6 touches the electrode 12 provided on the operation surface 17a of the engine start switch 14 described later and operates the predetermined amount, that is, when the user presses the predetermined amount, the ID code is transmitted from the communication device 11 provided on the vehicle. The request signal S1 is received via the communication electrode 3 and the communication circuit 7. Then, in response to the ID code request signal S1, the ID code signal S2 is transmitted via the communication circuit 7 and the communication electrode 3.
[0023]
The communication device 11 includes an engine start switch 14 and a microcomputer (hereinafter, referred to as a vehicle-side microcomputer) 15 as control means. The electrode 12 and the push switch 17 of the engine start switch 14 are connected to the vehicle microcomputer 15. The engine start switch 14 includes a mechanism that contacts the terminal 12t when the electrode 12 is pressed together with the push switch 17. Then, at this time, the vehicle-side microcomputer 15 detects a change in capacitance charged on the surface of the electrode 12, transmits an ID code request signal S1 based on the detection result, and responds to the ID code request signal S1. An ID code signal S2 is received from the portable device 1. Then, the ID code unique to the vehicle stored in the memory 15a is compared with the ID code included in the ID code signal S2 received from the portable device 1 via the electrode 12. When the push switch 17 is pushed to a position where the electrode 12 and the terminal 12t come into contact, the switch contact 17b is connected, and a push signal is transmitted to the vehicle-side microcomputer 15. For this reason, the vehicle-side microcomputer 15 receives the push signal and, when the identity can be confirmed by ID collation, transmits a start command signal (operation permission signal) to the engine starting device 16 to start the engine. Note that the timing at which the electrode 12 contacts the terminal 12t and the timing at which the switch contact 17b connects may be shifted so that either one comes first.
[0024]
Next, the operation of the keyless system in the present embodiment will be described.
As shown in FIG. 1, the user pushes the push switch 17 while touching the electrode 12 provided on the engine start switch 14 of the vehicle with the portable device 1 worn on the body. When the electrode 12 comes into contact with the terminal 12t, the switch contact 17b is also connected, and the vehicle-side microcomputer 15 inputs a push signal from the push switch 17 and transmits an ID code request signal S1 via the electrode 12 to the portable device. Send to 1.
[0025]
The body-side microcomputer 6 receives the ID code request signal S1 transmitted from the communication device 11 via the communication electrode 3 and the communication circuit 7. Then, as a response to the ID code request signal S1, the body side microcomputer 6 transmits the ID code signal S2 to the communication device 11 via the communication circuit 7 and the communication electrode 3.
[0026]
The vehicle-side microcomputer 15 compares the ID code included in the ID code signal S2 received via the electrode 12 with the ID code stored in the memory 15a in advance, and the two ID codes match and the identity is confirmed. Under the condition, a start command signal is transmitted to the engine start device 16 to start the engine. On the other hand, if the ID codes do not match, it is determined that the user is not the user, and the vehicle microcomputer 15 does not start the engine.
[0027]
According to the present embodiment, the following effects can be obtained.
(1) The engine start switch 14 includes a push switch 17 and an electrode 12 provided on an operation surface 17a of the push switch 17, and the electrode 12 comes into contact with the terminal 12t when pressed together with the push switch 17. Therefore, communication is performed only when the push switch 17 is intentionally operated by a predetermined amount while the electrode 12 is in contact with a part of the body, and the engine can be started. Therefore, the engine can be started only when the user intentionally operates.
[0028]
(2) The electrode 12 is disposed on the operation surface 17a of the push switch 17 as a mesh electrode 12a. For this reason, it is possible to touch the mesh-shaped electrode 12a so that the fingertip sinks in, and the contact state with the body is improved. Further, since the electrode 12a is formed on the operation surface 17a when operating the push switch 17, the contact pressure between the electrode 12a and the body can be improved.
[0029]
(3) The electrode 12 is provided as a character-shaped electrode 12b on the operation surface 17a of the push switch. In the present embodiment, the characters are formed in the form of the character “START”, but other character shapes may be employed. For this reason, the designability can be improved by the character-shaped electrode 12b.
[0030]
(2nd Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG. This embodiment is different from the above embodiment in the structure of an engine start switch. Hereinafter, the points different from the first embodiment will be mainly described.
[0031]
FIG. 4A is a perspective view of the engine start switch 14 in the present embodiment, and FIG. 4B is a cross-sectional view of the engine start switch 14. As shown in these drawings, the electrode 12c is disposed at a position recessed from the operation surface 18a in a hole 18b formed in a part of the center of the operation surface 18a of the push switch 18, and the operation surface 18a It is a mechanism that makes it difficult to touch the electrode 12c only by touching. The push switch 18 is urged by a spring 19 so as to return to the operation surface 18a side even when pressed. Therefore, in a state where it is not pushed, the operation surface 18a is always at a position higher than the electrode 12c.
[0032]
Next, the operation of the keyless system in the present embodiment will be described.
When the user presses the push switch 18 while wearing the portable device 1, only the push switch 18 moves. At this time, the electrode 12c does not move with the push switch 18. Then, the user presses the push switch 18 by a predetermined amount until the operation surface 18a becomes substantially the same height as the electrode 12c, so that the electrode 12c is exposed from the hole 18b and can touch the electrode 12c. That is, as the push switch 18 is pressed or released, the electrode 12c comes out of the hole 18b. At this time, the vehicle microcomputer 15 receives the push signal from the push switch 18 and transmits the ID code request signal S1 to the portable device 1 via the electrode 12. When receiving the ID code signal S2 as a response to the ID code request signal S1, the ID code included in the signal S2 is compared with the ID code stored in the memory 15a in advance. Then, a start command signal is transmitted to the engine starter 16 to start the engine.
[0033]
Therefore, according to the present embodiment, the following effects can be obtained.
(1) The electrode 12c is disposed at a position recessed from the operation surface 18a in a hole 18b formed in a part of the center of the operation surface 18a of the push switch 18. Therefore, it is difficult to touch the electrode 12c only by touching the operation surface 18a. Therefore, it is possible to reduce unintentional contact with the electrodes, and communication is performed only when the operation switch is intentionally operated by a predetermined amount.
[0034]
The above embodiments may be modified as follows.
In the second embodiment, the electrode 12c is disposed at a position immersed from the operation surface 18a in one hole 18b. However, as shown in FIG. 5, for example, a plurality of holes 18b are provided (see FIG. 5). 5, four electrodes may be provided), and the electrode 12d may protrude from the holes 18b. According to this, since one of the holes 18b becomes smaller, it is possible to further prevent the electrode from being inadvertently touched by a fingertip or the like, and it is possible to touch the electrode only intentionally.
[0035]
In the second embodiment, the electrode 12c is disposed so as to be exposed on the outer surface at a position where the electrode 12c is recessed from the operation surface 18a of the push switch 18, but a mechanism in which the electrode 12 is covered with a protective member may be employed. . For example, as shown in FIG. 6, the electrode 12e may be covered with a protective member 21. For example, covering with a protective member 21 made of rubber or resin is conceivable. In this case, a cut 22 is made in the protective member 21 and the push switch 18 is pressed so that the electrode 12 e protrudes from the cut 22 of the elastic protective member 21. According to this, the electrode 12e cannot be touched unless the push switch 18 is pressed, so that the electrode 12e does not touch the electrode unintentionally, and can be touched only intentionally.
[0036]
In the above embodiments, the push switches 17 and 18 are made of box-shaped resin. However, the push switches themselves may be made of an elastic member, and may be configured to return to the original state by an elastic force. For example, as shown in FIGS. 7A and 7B, the electrode 12 may be arranged on a push switch 23 made of rubber. Then, as shown in FIG. 7B, when the operation surface 23a is pressed by the user, the rubber bends and comes into contact with the terminal 12t on the communication device 11 side.
[0037]
In the above embodiments, the vehicle-side microcomputer 15 inputs the push signal from the push switches 17 and 18 together with the ID collation, but the engine may be started only by ID authentication. That is, in the first embodiment, even if a push signal is not transmitted, the electrode 12 does not contact the terminal 12t unless the push switch 17 is pressed. In the second embodiment, the electrode 12 cannot be touched unless the push switch 18 is pressed. With these, the same effects as those of the above embodiments can be obtained.
[0038]
In the above embodiments, the electrodes are made of metal. However, the present invention is not limited to this. The electrodes may be made of conductive resin or conductive polymer material.
-In the first embodiment, the shape of the character is not limited to "START". Other characters may be used. However, an easy-to-understand engine start switch 14 is desirable.
[0039]
In the first embodiment, in the case of the character-shaped electrode 12b formed in the shape of a character, the character-shaped electrode 12b may have a thickness. By doing so, the fingertip sinks into the character-type electrode 12b, so that the contact pressure can be improved, and the contact condition can be improved.
[0040]
In the above embodiments, the engine start switch 14 is used, but the invention is not limited to this. It may be used for performing other operations, for example, it may be used for a switch when opening and closing a window of a vehicle.
[0041]
-In each of the above embodiments, the receiver is provided in the vehicle, but is not limited to this. For example, it may be used for a house or the like, or may be used for a front door. It may be used when opening a safe or the like.
[0042]
In the above embodiments, the push switches 17 and 18 are urged by the springs S and 19 to return to the operation surfaces 17a and 18a. However, the present invention is not limited to the springs S and 19 and may be any other elastic members.
[0043]
-In the said 2nd Embodiment, although the electrode 12c was fixed and was not pushed with the push switch 18, it is good also as a mechanism which can also push the electrode 12c. In this case, the engine can be started by pressing the push switch 18 to the height of the electrode 12c and further pressing the push switch 18 while touching the electrode 12c.
[0044]
-In each said embodiment, not only a push switch but other operation switches may be sufficient. For example, a momentary switch, a toggle switch, an alternate switch, or the like may be used. The switch is not particularly limited as long as it has an operation surface and includes an electrode.
[0045]
Next, technical ideas that can be grasped from the embodiment and other examples will be additionally described below.
(1) The operation switch is formed of an elastic member, and when the body of the user wearing the portable device touches the operation surface of the operation switch and further operates the operation surface by a predetermined amount, the operation switch bends. The receiver according to claim 2, further comprising a mechanism for communicably connecting the electrode and a terminal on the communication means side.
[0046]
(2) The receiver according to (2) or the technical idea (1), wherein the electrode is formed in a mesh shape over substantially the entire operation surface of the operation switch.
[0047]
(3) The receiver according to (2) or the technical idea (1), wherein the electrode is formed of a character-shaped electrode in a character shape on an operation surface of the operation switch.
[0048]
【The invention's effect】
According to the present invention, communication can be performed only when the operation switch is intentionally operated by a predetermined amount.
[Brief description of the drawings]
FIG. 1 is a schematic diagram of a keyless system.
FIG. 2A is a perspective view of an engine start switch according to the first embodiment, and FIG. 2B is a perspective view of an engine start switch different from FIG.
FIG. 3 is a schematic diagram showing an electrical configuration of a portable device and a communication device.
4A is a perspective view of an engine start switch according to a second embodiment, and FIG. 4B is a cross-sectional view of the engine start switch according to the second embodiment.
FIG. 5 is a perspective view of an engine start switch in another example.
FIG. 6 is a perspective view of an engine start switch in another example different from FIG. 5;
7A is a perspective view of an engine start switch in another example different from FIGS. 5 and 6, and FIG. 7B is a sectional view of the engine start switch.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Portable machine, 3 ... Communication electrode, 4 ... Reference potential electrode, 11 ... Communication device, 12 ... Electrode, 12a, 12c, 12d, 12e ... Electrode, 12b ... Character electrode, 12t ... Terminal, 14 ... Engine start Switches, 15: Vehicle-side microcomputer as control means, 17, 18, 23 ... Push switches as operation switches, 17a, 18a, 23a ... Operation surface, 18b ... Hole, 21 ... Protective member, 22 ... Break.

Claims (5)

An operation switch, and a mechanism for electrically connecting a part of the body to communication means via an electrode that contacts the part of the operated body when the operation switch is operated by a predetermined amount; When the user wearing the electrode in contact with the skin operates the operation switch by a predetermined amount and a part of the operated body is electrically connected to the communication unit via the electrode, the portable device and An ID collation is performed between the communication means and the body by a biometric communication using the body as a transmission line, and if the identity is confirmed by the ID collation, the communication means outputs a signal for permitting execution of a predetermined operation to the control means. A receiver characterized in that: An operation switch, an electrode provided on an operation surface of the operation switch, and electrically connecting the electrode to a terminal on the communication means side when the operation switch is operated by a predetermined amount while touching the electrode. A biomechanical communication with a body as a transmission line between the portable device and the communication means when a user wearing the portable device with the electrode in contact with the skin operates the operation switch by a predetermined amount. A receiver characterized by performing ID collation and, if the identity is confirmed by the ID collation, the communication means outputs a signal permitting execution of a predetermined operation to the control means. An operation switch, and a mechanism provided so that a part of the operated body touches an electrode on the communication means side when the operation switch is operated by a predetermined amount by touching the operation surface. When a part of the operated body contacts the electrode on the communication means side by the user who has worn the contact switch operating the operation surface of the operation switch by a predetermined amount, the portable device and the communication means between the portable device and the communication means A receiver, wherein ID verification is performed by biometric communication using a body as a transmission line, and if the identity is verified by the ID verification, the communication means outputs a signal for permitting execution of a predetermined operation to the control means. The mechanism is provided with a hole formed in a part of the operation surface of the operation switch, and such that the operation switch is exposed on the operation surface from the hole when the operation switch is operated by a predetermined amount by touching the operation surface. The receiver according to claim 3, further comprising the electrode provided so as to be able to protrude and retract from the hole according to operation / release. The mechanism includes a protection member formed of an elastic material having a cut in a portion corresponding to the electrode while forming the operation surface, and when the operation switch is operated by a predetermined amount, the cut in the protection member is opened and the electrode is opened. The receiver according to claim 4, wherein the receiver is configured to be exposed on an operation surface.

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