JP2011243399A - Switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a switch which is easily assembled to a device and adjusted.SOLUTION: The switch of this invention includes: a first detecting electrode 5 detecting a change in capacitance between the first detecting electrode 5 and an input object; a second detecting electrode 6 provided away from the first detecting electrode 5 and detecting a change in capacitance between the second detecting electrode 6 and the input object; and an elastic member 7 made of a dielectric material which connects with the first detecting electrode 5 and is provided away from the second detecting electrode 6. The elastic member 7 is pressed by the input object and comes in contact with the second detecting electrode 6.

Description

  The present invention relates to a switch.

Conventionally, as a switch for performing an input operation on an electronic device, for example, a switch for detecting a plurality of types of input operations on one key is known.
As an example of an electronic apparatus including such a switch, Patent Document 1 discloses a half-press detection unit that detects an input operation for half-pressing a shutter key, and a full-press detection unit that detects an input operation for fully pressing a shutter key. And a digital camera provided with a switch.
The switch described in Patent Document 1 outputs a half-press detection signal when the half-press detection unit detects that the shutter key has reached an intermediate point in the pressing direction of the shutter key, When the full-press detection unit detects that the shutter key has reached the lowest point, the full-press detection unit outputs a full-press detection signal.

JP 2009-282541 A

  However, in the switch provided in the digital camera described in Patent Document 1, in order to detect two types of input operations, that is, full-press and half-press of the shutter key, the threshold value is previously adjusted at the intermediate point. There is a need to. For this reason, adjustment of the switch assembled in the digital camera may be complicated.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a switch that can easily adjust a threshold value.

In order to solve the above problems, the present invention proposes the following means.
The switch of the present invention detects a change in capacitance between the first detection electrode that detects a change in capacitance between the input body and the input body that is provided apart from the first detection electrode. A second sensing electrode that is connected to the first sensing electrode, and is made of a dielectric material provided apart from the second sensing electrode, and is close to the second sensing electrode by being pressed by the input body. And an elastic member.

  The switch of the present invention includes a first detection electrode that detects a change in capacitance between the input body and a second detection electrode that is provided apart from the first detection electrode and detects a change in resistance value. The first detection electrode and the second detection electrode are electrically connected to the first detection electrode and made of a conductive material provided apart from the second detection electrode, and are pressed by the input body. A contact member that is connected to the contact member on the opposite side of the first detection electrode and the second detection electrode across the contact member, and is made of a dielectric material and pressed by the input body to And an elastic member to be pressed.

The contact member is preferably a metal dome made of a dome-shaped metal.
Moreover, it is preferable that the said elastic member has a light transmittance.
The first sensing electrode is preferably formed surrounding the second sensing electrode.

  According to the switch of the present invention, the first detection electrode detects that the input body has approached the switch, and the second detection electrode detects that the input body has pressed the elastic member of the switch. The threshold value for distinguishing between approaching and being pressed by the input body can be easily adjusted.

(A) is a top view which shows the switch of 1st Embodiment of this invention, (B) is sectional drawing in the AA of (A). (A) is sectional drawing in the BB line of FIG. 1 (B), (B) is sectional drawing in the CC line of FIG. 1 (B). It is operation | movement explanatory drawing for demonstrating the operation | movement at the time of use of the switch. (A) is sectional drawing which shows the switch of 2nd Embodiment of this invention, (B) is operation | movement explanatory drawing for demonstrating the operation | movement at the time of use of the switch. (A) is a partial cutaway view showing a switch according to a third embodiment of the present invention, (B) is a cross-sectional view taken along line DD of (A), and (C) is a cross-sectional view taken along line EE of (A). It is. It is sectional drawing which shows the structure of the modification of the switch. (A) And (B) is explanatory drawing for demonstrating the modification of the switch of this invention. It is explanatory drawing for demonstrating the further another modification of the switch of this invention.

(First embodiment)
A switch 1 according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 3 together with an input device 2 including the switch 1. FIG. 1A is a plan view showing a switch 1 of this embodiment. FIG. 1B is a cross-sectional view taken along line AA in FIG. FIG. 2A is a cross-sectional view taken along line BB in FIG. FIG. 2B is a cross-sectional view taken along line CC in FIG. FIG. 3 is an operation explanatory diagram for explaining an operation when the switch 1 is used.

As shown in FIG. 1A, the input device 2 includes a switch 1 and a detection circuit 3.
As shown in FIGS. 1A and 1B, the switch 1 includes a substrate 4, a first detection electrode 5, a second detection electrode 6, an elastic member 7, and a key top 8. In the following description, it is assumed that the substrate 4 is on the bottom and the key top 8 is on the top.

  The substrate 4 is formed in a plate shape or a thin plate shape, and has a first detection electrode 5 and a second detection electrode 6 on one surface in the plate thickness direction. Examples of the material of the substrate 4 include polyester, polypropylene, vinyl chloride, polyethylene, polyethylene terephthalate, polycarbonate, nylon (registered trademark), vinylon, acetate, polyamide, polyimide, polyacryl, polyvinyl chloride, and acrylic resin. Or a printed circuit board made of glass epoxy resin can be employed. In the present embodiment, polyethylene terephthalate having optical transparency is adopted as the material of the substrate 4. Hereinafter, the surface of the substrate 4 on which the first detection electrode 5 and the second detection electrode 6 are provided is the front surface, and the surface opposite to the surface in the thickness direction of the substrate 4 is the back surface. Give an explanation.

  The first detection electrode 5 and the second detection electrode 6 are made of a material having electrical conductivity, and are fixed to the surface of the substrate 4. In the present embodiment, the first detection electrode 5 and the second detection electrode 6 are each made of a material having electrical conductivity. Specifically, the material of the first sensing electrode 5 and the second sensing electrode 6 is a conductive material made of a transparent conductive polymer containing polythiophene, polyaniline, or the like, or a metal such as gold, silver, or copper. A thin film containing a material or an oxide thereof, a light-transmitting thin film containing a metal oxide such as indium tin oxide (ITO), or a conductive ink containing metal nanowires or carbon nanotubes can be employed. In the present embodiment, the first detection electrode 5 and the second detection electrode 6 are made of indium tin oxide (ITO).

  As shown in FIG. 2A, the first detection electrode 5 is formed in a substantially annular shape when viewed from the thickness direction of the substrate 4. The second detection electrode 6 is formed in a circular shape when viewed from the thickness direction of the substrate 4. Further, the first detection electrode 5 has a cut at a part of the ring. In the present embodiment, the first detection electrode 5 surrounds a part of the second detection electrode 6 on the surface of the substrate 4, and there is a gap between the first detection electrode 5 and the second detection electrode 6. is there. For this reason, the first detection electrode 5 and the second detection electrode 6 are provided apart from each other and are electrically insulated.

  As shown in FIG. 1B, a first wiring 9 and a second wiring 10 for connecting to the detection circuit 3 are connected to each of the first detection electrode 5 and the second detection electrode 6. In the present embodiment, as shown in FIG. 1A, the first wiring 9 is routed around the surface of the substrate 4, and the second wiring 10 is first detected through the ring break of the first detection electrode 5. The surface of the substrate 4 is drawn out to the outside of the electrode 5. The first wiring 9 and the second wiring 10 are each electrically connected to the detection circuit 3.

As shown in FIGS. 1B and 2B, the elastic member 7 is made of a dielectric material and has elasticity. As a material of the elastic member 7, for example, silicone rubber can be employed. Furthermore, in this embodiment, the elastic member 7 has light transmittance. The outer peripheral portion of the elastic member 7 is formed in a cylindrical shape whose central axis extends in the thickness direction of the substrate 4, and the lower end portion of the cylinder is connected to the first detection electrode 5. The upper end of the cylinder of the elastic member 7 is closed in a thin lid shape, and a truncated cone-shaped protrusion 7 a that protrudes toward the second detection electrode 6 is formed. The lower end of the protrusion 7a and the second detection electrode 6 are separated from each other. In addition, a surface parallel to the second detection electrode 6 is formed at the lower end of the protrusion 7a.
The upper part of the cylinder of the elastic member 7 is formed in a solid columnar shape that is coaxial with the cylinder of the elastic member 7.

  As shown in FIG. 1B, the key top 8 is fixed to the upper end of the elastic member 7, and is made of a dielectric material such as resin or a metal material. In the present embodiment, as the material of the key top 8, a resin having light transparency is adopted. The shape of the key top 8 can be an appropriate shape. For example, decoration may be provided on the upper end of the key top 8 by unevenness or printing. If the key top 8 is made of a metal material, the portion made of the dielectric material can be made only of the elastic member 7, and the change in capacitance can be easily detected.

  The detection circuit 3 is a circuit that detects a change in capacitance. In the present embodiment, the detection circuit 3 is electrically connected to each of the first detection electrode 5 and the second detection electrode 6, and the capacitance change in the first detection electrode 5 and the second detection electrode 6 can detect each change in electrostatic capacitance. In the present embodiment, in the detection circuit 3, the threshold value of the change in capacitance is set for each of the first detection electrode 5 and the second detection electrode 6, and the first detection electrode 5 and the second detection electrode are set. It is determined that there is an input when a change in capacitance exceeding a threshold value occurs with respect to each of the electrodes 6. The threshold value in the first detection electrode 5 is determined based on the magnitude of the capacitance between the input body I and the first detection electrode 5 when the input body I is in contact with the key top 8. The threshold value of the second detection electrode 6 is the input body I when the key top 8 is pushed downward by the input body I and the projection 7a of the elastic member 7 contacts the second detection electrode 6 (see FIG. 3). And the second sensing electrode 6 are determined based on the magnitude of the capacitance. That is, in the present embodiment, each threshold value in the detection circuit 3 is determined based on the type of the input body I that is supposed to touch the key top 8 or press the key top 8. It is determined so that it can detect that the top 8 is touched and that the input body I presses the key top 8 and the projection 7a and the second detection electrode 6 come into contact with each other.

  The operation of the switch 1 having the above-described configuration will be described together with the operation when the input device 2 is used. Below, the case where a person's finger is used as input body I which performs input operation to switch 1 is illustrated.

  When the input device 2 is used, as shown in FIG. 1B, the switch 1 and the detection circuit 3 are electrically connected to each other. The detection circuit 3 detects a change in capacitance that is different from each other for the first detection electrode 5 and the second detection electrode 6. The input device 2 is waiting for input in this state.

  As shown in FIG. 1B, when the finger is not touching the key top 8 of the switch 1, the second detection electrode 6 and the protrusion 7a are separated from each other. Here, when the finger approaches the upper surface of the key top 8 of the switch 1, the capacitance changes between the finger and the first detection electrode 5 and between the finger and the second detection electrode 6. When the finger touches the upper surface of the key top 8, the capacitance between the finger and the first detection electrode 5 increases beyond the threshold value in the detection circuit 3, so that the detection circuit 3 moves to the first detection electrode 5. In contrast, it is determined that an input operation has been performed.

  As shown in FIG. 3, when the key top 8 is further pushed downward by the finger, the elastic member 7 is elastically deformed, and the protrusion 7 a of the elastic member 7 is close to the second detection electrode 6. When the key top 8 is further pushed in, the protrusion 7 a of the elastic member 7 comes into contact with the second detection electrode 6. Then, the elastic member 7 and the key top 8 are sandwiched between the finger and the second detection electrode 6. By pushing the key top 8 with a finger, the air layer between the finger and the second detection electrode 6 disappears, so that the air layer is formed by the finger, the key top 8, the elastic member 7, and the second detection electrode 6. A capacitor that does not contain is formed. As a result, the capacitance between the finger and the second detection electrode 6 is increased as compared with the no-load state in which the key top 8 is merely pressed and the key top 8 is not pressed, and the detection circuit 3 The threshold for the second detection electrode 6 set to be exceeded. Accordingly, the detection circuit 3 determines that an input operation has been performed on the second detection electrode 6.

  As described above, according to the switch 1 of the present embodiment, the first detection electrode 5 detects that the key top 8 is touched, and the second detection electrode indicates that the key top 8 is pushed by the finger. 6 is detected. Rather than detecting a change in electrostatic capacitance that continuously changes from when a finger touches the key top 8 until the key top 8 is pressed, the protrusion 7 a of the elastic member 7 contacts the second detection electrode 6. Therefore, the threshold value for distinguishing between the finger touching the key top 8 and the key top 8 being pushed in can be easily set. For this reason, the switch 1 assembled | attached to the apparatus can be adjusted easily.

  Conventionally, it is known that the terminal is made conductive by a conductive rubber to determine that the switch has been pushed in. However, the conductive rubber is generally not light-transmitting and illuminates the key top. There is a possibility that the light to be blocked by the conductive rubber. On the other hand, in this embodiment, the board | substrate 4, the 1st detection electrode 5, the 2nd detection electrode 6, the elastic member 7, and the keytop 8 have a light transmittance, and detect the change of an electrostatic capacitance. Therefore, it is possible to determine whether the key top 8 is in contact with the upper surface of the key top 8 and whether the key top 8 is pressed. .

  Further, since the first detection electrode 5 is formed in an annular shape surrounding the second detection electrode 6, the protrusion 7 a is formed on the second detection electrode 6 if the elastic member 7 is arranged in accordance with the shape of the first detection electrode 5. Since it is aligned at a position where it can contact, the elastic member 7 can be easily assembled.

(Second Embodiment)
Next, the switch 11 according to the second embodiment of the present invention will be described with reference to FIGS. 4A and 4B together with the input device 12 including the switch 11. FIG. 4A is a cross-sectional view showing the switch 11 of the present embodiment. FIG. 4B is an operation explanatory diagram for explaining an operation when the switch 11 is used.
In each embodiment described below, portions having the same configuration as those of the switch 11 of the first embodiment described above are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 4A, the switch 11 of this embodiment includes an elastic member 13 having a shape different from that of the elastic member 7 instead of the elastic member 7 described in the first embodiment, and also has a dome shape. A metal dome 14 (contact member) made of metal is further provided.

  The elastic member 13 in this embodiment is formed such that the inner diameter of the outer peripheral cylinder is larger than the outer diameter of the first detection electrode 5, and the lower end of the cylinder is fixed to the substrate 4. For this reason, the elastic member 13 and the first detection electrode 5 are not connected. Further, the material of the elastic member 13 in the present embodiment is a dielectric material as in the first embodiment.

  The metal dome 14 is disposed inside the cylinder of the elastic member 13, the outer periphery is connected to the first detection electrode 5, and the dome-shaped apex is pressed against the lower surface of the protrusion 7 a of the elastic member 13. The metal dome 14 is elastically deformed when the dome-shaped apex is pressed toward the surface of the substrate 4, the apex contacts the second detection electrode 6 formed on the surface of the substrate 4, and the first detection electrode 5. The second detection electrode 6 is electrically connected. Further, the metal dome 14 returns to the original dome shape when the dome-shaped apex is released.

  In the present embodiment, detection circuits 15 and 16 different from the detection circuit 3 described in the first embodiment are connected to the first detection electrode 5 and the second detection electrode 6. That is, in the present embodiment, a detection circuit 15 that detects a change in capacitance is connected to the first detection electrode 5, and a detection circuit 16 that detects a change in resistance value is connected to the second detection electrode 6. Is done.

The operation of the switch 11 having the configuration described above will be described.
When the input body contacts the key top 8 of the switch 11, the detection circuit 15 connected to the first detection electrode 5 changes the capacitance of the first detection electrode 5 in the same manner as described in the first embodiment. Is detected, and it is determined that there is an input to the first detection electrode 5.
As shown in FIG. 4B, when the key top 8 of the switch 11 is pressed by the input body, the elastic member 13 is elastically deformed by a load applied to the key top 8 by a finger. At this time, the protrusion 7 a of the elastic member 13 presses the dome-shaped apex of the metal dome 14 to elastically deform the metal dome 14. Then, the vicinity of the top of the dome shape of the metal dome 14 becomes convex toward the second detection electrode 6, and at this time, a click feeling is transmitted to the finger through the elastic member 13 and the key top 8 by the metal dome 14. Furthermore, the dome-shaped apex of the metal dome 14 is in contact with the second detection electrode 6, and the first detection electrode 5 and the second detection electrode 6 are electrically connected through the metal dome 14. The detection circuit 16 connected to the second detection electrode 6 detects a change in the resistance value of the second detection electrode 6 and determines that there is an input to the second detection electrode 6.

  As described above, according to the switch 11 of the present embodiment, the first detection electrode 5 detects that a finger touches the key top 8 of the switch 11, and the second press of the key top 8 of the switch 11 is pressed. Since it is possible to determine that there is an input by the detection circuits 15 and 16 that are detected by the detection electrode 6 and connected to the first detection electrode 5 and the second detection electrode 6, respectively, the first embodiment described above. Has the same effect as.

  Further, when the key top 8 is pressed, the metal dome 14 is elastically deformed. At this time, a click feeling is transmitted to the finger pressing the key top 8, so that it is easy to understand that the key top 8 has been pressed down reliably. Yes.

  The first detection electrode 5 is detected by a change in capacitance, and the second detection electrode 6 is detected by a change in resistance value, which is a method different from the change in capacitance. Therefore, the possibility of erroneous detection occurring in the detection circuits 15 and 16 connected to the first detection electrode 5 and the second detection electrode 6 can be reduced.

(Third embodiment)
Next, the switch 17 according to the third embodiment of the present invention will be described with reference to FIGS. 5A, 5 </ b> B, and 5 </ b> C together with the input device 18 including the switch 17. FIG. 5A is a partial cutaway view showing a switch 17 according to a third embodiment of the present invention. FIG. 5B is a cross-sectional view taken along line DD in FIG. FIG. 5C is a cross-sectional view taken along line EE in FIG.

  As shown in FIGS. 5A and 5B, in the input device 18 of this embodiment, a plurality of switches 17 are arranged on the substrate 4, and the elastic member 7 described in the first embodiment is used. Instead of the input device 18 of the first embodiment described above, a sheet-like elastic member 19 that is integrated by connecting a plurality of switches 17 is provided. The material of the elastic member 19 is a dielectric material as in the first embodiment. In this embodiment, the elastic member 19 is light transmissive. Similarly to the first embodiment, the elastic member 19 is provided with a protrusion 7 a that protrudes toward the second detection electrode 6.

  As shown in FIGS. 5A and 5C, the elastic member 19 of this embodiment includes a plurality of illumination units 20 made of LEDs, and causes the illumination unit 20 to emit light by power supply means (not shown). Can be done. The plurality of illumination units 20 are embedded in the elastic member 19. In the present embodiment, light emitted from the illumination unit 20 is guided through the elastic member 19 and transmitted to the key top 8. That is, the elastic member 19 of the present embodiment functions as a light guide that transmits light to the key top 8.

  Further, as shown in FIG. 5B, in the present embodiment, the first detection electrode 5 and the second detection electrode 6 provided in each of the plurality of switches 17 are detection circuits that detect a change in capacitance. 21 is connected. The detection circuit 21 in the present embodiment has a threshold value that is set in the same manner as in the first embodiment, and the capacitance of each of the plurality of first detection electrodes 5 and the plurality of second detection electrodes 6 exceeds the threshold value. It is determined that there was an input.

  Even in such a configuration, as with the switch 17 described in the first embodiment, when the finger touches the key top 8 and when the key top 8 is pressed by the finger, the detection circuit 21 is notified. Can be detected.

  Moreover, since the illumination part 20 which illuminates the key top 8 is embedded in the elastic member 19, the switch 17 can be reduced in size and it can reduce that the light which injects into the elastic member 19 leaks outside. .

(Modification)
Next, the switch 22 according to the first modification of the present embodiment will be described with reference to FIG. FIG. 6 is a cross-sectional view showing the switch 22 of this modification, and is a cross-sectional view similar to the line DD in FIG.
Also in this modification, a plurality of switches 22 are arranged on the substrate 4 as in the third embodiment. In this modification, the metal dome 14 is connected to the first detection electrode 5 as described in the second embodiment, and a sheet-like elastic member 23 is provided instead of the elastic member 13. . In this modification, the key top 8 is not provided, and the input body I touches the upper surface of the elastic member 23. Further, in this modification, unlike the above-described embodiments, the elastic member 23 is formed with a protrusion 23 a by an adhesive, and the protrusion 23 a is bonded to the dome-shaped apex of the metal dome 14.
In the present modification, as described in the second embodiment, the detection circuit detects the change in capacitance at the first detection electrode 5 and detects the change in resistance value at the second detection electrode. 15 and 16 are connected to each other.

Even with such a configuration, the same effects as those of the second embodiment described above can be obtained.
Further, since the protrusion 23a is formed of an adhesive and the elastic member 23 and the metal dome 14 are bonded, the metal dome 14 may move in a space partitioned by the substrate 4 and the elastic member 23. Absent.

The embodiment of the present invention and the modifications thereof have been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and design changes and the like within a scope not departing from the gist of the present invention are possible. included.
For example, in each of the above-described embodiments and modifications, the example in which a human finger is used as the input body has been described. However, the input body is not limited to the human finger. For example, a conductor rod such as a stylus pen can be employed as the input body.

  Further, the arrangement of the first detection electrode 5 and the second detection electrode 6 in the switch 1 described in the first embodiment is not limited to the arrangement described above. A modification of the switch will be described with reference to FIGS. 7A, 7B, and 8. FIG. FIG. 7A, FIG. 7B, and FIG. 8 are explanatory diagrams for explaining modifications of the switch. In the following, members having the same functions as those described in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and redundant description is omitted.

  As shown in FIG. 7A, the second detection electrode 6 may be provided on the lower surface of the substrate 4. The elastic member 7 in this case is close to the second detection electrode 6 when pressed by the input body, and contacts the upper surface of the substrate 4 when pressed by the input body. Even in such a configuration, the capacitance changes in the second detection electrode 6 due to the proximity of the protrusion 7a to the second detection electrode 6, and this change can be detected by the detection circuit 3. The same effects as those of the first embodiment are obtained.

  Further, as shown in FIG. 7B, the first detection electrode 5 may be provided on the lower surface of the substrate. The elastic member 7 in this case is not in direct contact with the first detection electrode 5 but is connected to the first detection electrode 5 via the substrate 4. For this reason, in the example shown in FIG. 7B, a capacitor with at least the elastic member 7 and the substrate 4 sandwiched between the input body and the first detection electrode 5 is formed. Even in such a configuration, since the detection circuit 3 can detect a change in capacitance in the capacitor formed between the input body and the first detection electrode 5, the switch 1 of the first embodiment. Has the same effect as.

  In addition, as shown in FIG. 8, an insulating layer 24 having an insulating property is further provided on the first detection electrode 5 and the second detection electrode 6, and the first detection electrode 5, the second detection electrode 6, and the elastic member 7. The insulating layer 24 may be interposed between the two. In this case, the insulating member 7 is connected to the first detection electrode 5 via the insulating layer 24, and is pressed by the input body to be close to the second detection electrode 6 and pressed by the input body. Sometimes it contacts the upper surface of the insulating layer 24. Even with such a configuration, the same effects as those of the first embodiment can be obtained. Further, since the first detection electrode 5 and the second detection electrode 6 are sandwiched between the substrate 4 and the insulating layer 24, an external force is applied to the first detection electrode 5 and the second detection electrode 6 to cause damage. In addition, it is possible to suppress the first detection electrode 5 and the second detection electrode 6 from corroding when water or water vapor enters or condensation occurs.

  In addition, the constituent elements shown in the above embodiments and modifications can be combined as appropriate.

DESCRIPTION OF SYMBOLS 1 Switch 2 Input device 3 Detection circuit 4 Board | substrate 5 1st detection electrode 6 2nd detection electrode 7 Elastic member 7a Protrusion 8 Key top 9 1st wiring 10 2nd wiring 11 Switch 12 Input device 13 Elastic member 14 Metal dome 15,16 Detection circuit 17 Switch 18 Input device 19 Elastic member 20 Illumination unit 21 Detection circuit

Claims (5)

A first detection electrode for detecting a change in capacitance between the input body and the input body;
A second detection electrode that is provided apart from the first detection electrode and detects a change in capacitance with the input body;
An elastic member connected to the first detection electrode and made of a dielectric material provided apart from the second detection electrode, and being close to the second detection electrode by being pushed by the input body;
A switch comprising: A first detection electrode for detecting a change in capacitance between the input body and the input body;
A second detection electrode provided apart from the first detection electrode to detect a change in resistance value;
The first sensing electrode and the second sensing electrode are made conductive by being connected to the first sensing electrode and made of a conductive material provided apart from the second sensing electrode and being pushed by the input body. A contact member;
An elastic member connected to the contact member on the opposite side of the first detection electrode and the second detection electrode across the contact member, made of a dielectric material, and pressing the contact member when pressed by the input body When,
A switch comprising:   The switch according to claim 2, wherein the contact member is a metal dome made of a dome-shaped metal.   The switch according to any one of claims 1 to 3, wherein the elastic member has light permeability.   The switch according to any one of claims 1 to 4, wherein the first detection electrode is formed so as to surround the second detection electrode.

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