JP2003217383A - Switch unit and method for electrically connecting electromagnetic wave shield and ground terminal in switch unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To secure a dustproof property of a switch part and prevent deterioration of operation feeling with an electromagnetic wave shield in a switch unit, and to surely and easily electrically connect a conductive part of the electromagnetic wave shield and a ground terminal. <P>SOLUTION: A plate shaped body 20 is provided with a fixed electrode and a moving electrode 36 of a switch part 30. The moving electrode 36 is a snap plate. An electromagnetic wave shield 50 is laid on the plate shaped body 20. The electromagnetic wave shield 50 is a laminated body composed of a base layer 51 of polyethylene terephthalate film and an electromagnetic wave shield layer 52 of an aluminum thin film. The switch part 30 is covered with electromagnetic wave shield 50. The electromagnetic shield layer 52 of the electromagnetic wave shield 50 and the ground terminal 4 provided on the plate shaped body 20 are electrically connected via conductive paint 60. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch unit and a method for electrically connecting an electromagnetic wave shielding member and a ground terminal in the switch unit.

[0002]

2. Description of the Related Art In a switch unit used in a mobile communication device such as a mobile phone, when the switch unit is installed in the device, the body of the switch unit is mounted so as not to be bulky. There may be used a plate-shaped body in which the lead portion of the electrode forming the switch portion is embedded in the plate-shaped body by insert molding. In FIG. 8, a mobile phone adopting such a switch unit is partially omitted. In the figure, 1 is a case of a mobile phone, which is formed by combining a front case 2 and a back case 3. 4 is a display screen. The switch unit is fitted into a mounting groove (not shown) formed inside the front case 2 and the back case 3, and the operation member 5 of the switch unit is formed in an opening 6 formed on the side surface of the case 1.
Have been deployed to. Then, the on / off mode of the switch portion of the switch unit is controlled by pushing in the operation member 5.

FIG. 9 shows a conventional switch unit operated by the operation member 5 described in FIG. In the figure, 10 is an elongated plate-shaped body, which is formed of an electrically insulating synthetic resin molded body, and switch parts 12, 12 are provided on both left and right sides thereof. Each of these switch portions 12 includes a fixed electrode and a movable electrode as a counterpart electrode of the fixed electrode, and the movable electrode has a dome-shaped snap plate housed in a recessed portion provided in the plate-shaped body 10. Is used. Further, the plate-shaped body 10 has a slender electromagnetic wave shielding member 13 made of a metal plate.
Are overlapped with each other, and the electromagnetic wave shielding effect of the electromagnetic wave shielding member 13 shields the electromagnetic wave from the lead portion embedded in the plate-shaped body 10.

In the switch unit of FIG. 9, the openings 15 formed in the electromagnetic wave shielding member 13 face the above-mentioned switch portions 12 on the left and right, respectively, and the openings 15 are shown in FIG.
The protrusion (not shown) provided on the back side of the operation member 5 described in 1) faces the movable electrode formed of the snap plate. Then, when the operating member 5 is pushed in, the movable electrode performs an inversion operation from the initial shape, and when the pushing force by the operating member is released, the movable electrode returns from the inverted shape to the initial shape.

Further, in the conventional switch unit described in FIG. 9, the electromagnetic wave shielding member 13 made of a metal plate is replaced with a sheet material having conductivity and flexibility, and the switch portion 12 is made of the sheet material. Cover and switch section 1
There is also known one having improved dustproof property of No. 2. In this structure, a spring is used to elastically contact the conductive portion of the sheet material with the ground terminal as a means for electrically contacting the sheet material with the ground terminal on the body side, or alternatively, with the conductive portion of the sheet material. I was caulking and contacting with the ground terminal.

[0006]

However, in the conventional switch unit described with reference to FIG. 9, the opening 15 of the electromagnetic wave shielding member 13 made of a metal plate faces the switch portion 12,
Since the projection of the operation member 5 is opposed to the movable electrode formed of the snap plate through the opening 15, there is a problem in the dustproof performance of the switch portion 12. That is, since the switch unit is arranged inside the opening 6 of the case 1 in which the operating member 5 is arranged as described with reference to FIG. 8, dust that has entered through the opening 6 is switched from the opening 15 of the electromagnetic wave shielding member 13 to the switch 15. There is a risk that it may enter the switch section 12 of the unit and impair its switching performance and operability. On the other hand, when the switch portion 12 is covered with the electromagnetic wave shielding member 13 by eliminating the opening 15 of the electromagnetic wave shielding member 13, dust is prevented from entering the switch portion 12, so that the switch portion 12 itself. Although it is easy to maintain the switching performance and the operability of the switch section, if such a configuration is adopted, the protrusion of the operation member 5 causes the electromagnetic wave shielding member 13 made of a metal plate to bend when the operation member 5 is operated. Since it is necessary to reverse the snap plate 12 of the operation plate, there is a problem that it is difficult to obtain the operation feeling of the operation member 5 associated with the reverse operation of the snap plate.

On the other hand, in the conventional switch unit in which the electromagnetic wave shielding member 13 made of a metal plate is replaced with a conductive and flexible sheet material, the electromagnetic wave shielding member 13 covers the switch portion 12. The dust resistance of the switch portion 12 is excellent. However, in order to electrically connect the conductive part of the sheet material to the ground terminal on the body side, an extra spring is used, or a process that requires troublesome work such as caulking is required, so that the cost is higher. In addition, there is a problem that the product becomes thicker and a wider installation space is required.

The present invention has been made in view of the above problems, and while the electromagnetic wave shielding member secures the dustproof property of the switch section, the switching performance and operability of the switch section itself are less likely to be impaired. An object of the present invention is to provide a switch unit in which the operation feeling of the operation member due to the reversing operation of the snap plate employed in the switch portion is not easily impaired.

Further, according to the present invention, when the above dustproof property is secured by using a sheet material having conductivity and flexibility for the electromagnetic wave shielding member, without using a spring or caulking. An object of the present invention is to provide a switch unit capable of reliably electrically connecting a conductive portion of a sheet material and a ground terminal on the body side.

Further, according to the present invention, when the above dustproof property is secured by using a sheet material having conductivity and flexibility for the electromagnetic wave shielding member, the electrical conductivity between the conductive portion of the sheet material and the ground terminal is obtained. It is an object of the present invention to provide an electrical connection method between an electromagnetic wave shielding member and a ground terminal in a switch unit, which enables reliable and easy connection.

[0011]

A switch unit according to the present invention comprises a fixed electrode of a switch portion and a movable electrode as a counterpart electrode of the fixed electrode on an electrically insulating plate-like body formed of a synthetic resin molding. And the movable electrode is housed in the recessed portion provided in the plate-shaped body and faces the opening of the recessed portion, and the movable electrode is pushed in by the operating member to change its initial shape. Is a snap plate that returns to the initial shape from the inverted shape when the pushing force by the operating member is released and the lead portion connected to the fixed electrode is embedded in the plate-shaped body. An electromagnetic wave shielding member is superposed on the plate-shaped body. The electromagnetic wave shielding member is formed of a sheet material having conductivity and flexibility, and the sheet material closes the opening of the recessed portion,
The conductive portion of the sheet material and the ground terminal provided on the plate-shaped body are electrically connected to each other via a conductive substance that has fluidity in a softened state and hardens to reduce fluidity.

According to the present invention, since the electromagnetic wave shielding member covers the switch portion, the dust resistance of the switch portion is excellent.
Moreover, the conductive portion of the sheet material is electrically connected to the ground terminal on the plate-shaped body side through a conductive substance, and the conductive substance has fluidity in the softened state and hardens to flow. Has a property of being attenuated, so that a conductive material in a softened state can be electrically connected by simply applying it between the conductive part of the sheet material and the ground terminal on the plate-shaped body and loading it. Not only can it be done, but it is no longer necessary to use extra springs for connecting the conductive part of the sheet material and the ground terminal, or to perform processing that requires troublesome work such as caulking, and it is easy to reduce costs accordingly.
In addition, the effect that the thickness of the product is suppressed and the necessary installation space is easily narrowed is exhibited. In addition, since the electromagnetic wave shielding member that covers the space portion is formed of a sheet material having conductivity and flexibility, the operation feeling of the operating member that accompanies the reversal operation of the snap plate used in the switch portion is electromagnetic wave shielding. A situation in which it is damaged by a member is less likely to occur, and a good operation feeling can be obtained.

In the present invention, it is possible to adopt a construction in which the sheet material is a laminate of a base layer made of a polyethylene terephthalate film and an electromagnetic wave shielding layer made of an aluminum thin film. The sheet material is a laminate having two layers, a base layer made of a polyethylene terephthalate film and an electromagnetic wave shielding layer made of an aluminum thin film, and the base layer is attached to the plate-like body via an adhesive layer. It is desirable to adopt the configuration that According to this, since excellent durability exhibited by the polyethylene terephthalate film is imparted to the base layer, damage such as tearing of the electromagnetic wave shielding layer made of an aluminum thin film is less likely to occur, and the initial electromagnetic wave can be maintained for a long period of time. The shielding effect is maintained.
In addition, in the case where the base layer is attached to the plate-shaped body via the adhesive layer, the electromagnetic wave shielding layer can be applied to the plate-shaped body without performing special machining such as bending. It becomes possible to retain it with good performance.

Further, in the present invention, the sheet material is formed with an annular flexible portion which is pressed into the inside of the opening at the outer peripheral portion of the opening of the recessed portion, and It is particularly preferable to adopt a configuration in which the portion surrounded by the flexible portion is in close contact with the surface of the snap plate. According to this, since the flexible portion of the sheet material follows the reversing operation of the snap plate without resistance (without generating tension in the sheet material),
A situation in which the operation feeling of the operation member due to the reversing operation of the snap plate is impaired by the electromagnetic wave shielding member made of the sheet material is unlikely to occur, and a good operation feeling can be obtained.

In the present invention, the earth terminal projecting from the plate-shaped body is inserted into the opening formed in the sheet material, which is the laminated body in which the outermost layer is formed of the electromagnetic wave shielding layer. It is desirable that the ground terminal and the electromagnetic wave shielding layer facing the ground terminal at the edge of the opening are electrically connected via a conductive substance. It is desirable to use conductive paint for the material. According to this, the ground terminal and the electromagnetic wave shielding layer facing the ground terminal at the rim of the opening are electrically connected to each other through a conductive substance, preferably a conductive paint. Therefore, when electrically connecting the electromagnetic wave shielding layer to the ground terminal, a conductive paint having fluidity in a softened state is poured between the ground terminal and the electromagnetic wave shielding layer to be loaded, and then left to stand and the conductive paint is left. It only needs to be hardened, and it is not necessary to use extra parts such as springs or to perform troublesome processing work such as caulking.

In the present invention, the ground terminal is projected into the recess from the wall surface of the recess formed in the plate-shaped body, and the ground connection of the conductive material and the electromagnetic wave shielding layer is performed electrically. It is desirable that the location is housed in the recess. According to this, since the electrical connection portion between the ground terminal and the electromagnetic wave shielding layer does not protrude from the plate-shaped body, the switch unit is not bulky and the installation space thereof can be narrowed.

The electrical connection method between the electromagnetic wave shielding member and the ground terminal in the switch unit according to the present invention is an electrically insulating plate provided with a switch portion having a fixed electrode and a movable electrode as a counterpart electrode of the fixed electrode. Electromagnetic wave shielding member in a switch unit in which a lead portion connected to the fixed electrode is embedded in the plate-shaped body, and an electromagnetic wave shielding member is superposed on the plate-shaped body, and a ground terminal provided on the plate-shaped body And a conductive and flexible sheet material formed by a laminate of a base layer made of a polyethylene terephthalate film and an electromagnetic wave shielding layer made of an aluminum thin film in the electromagnetic wave shielding member. Is used to project from the wall surface of the recess formed in the plate-shaped body to the outside of the recess through the inside of the recess. The ground terminal comprising the elastic,
The sheet material is inserted into the opening provided in the sheet material, and the sheet material is superposed on the plate-shaped body, and then the ground terminal is pushed into the recess to form the ground terminal. After pushing the rim of the opening of the sheet material into the recess as well, by releasing the pushing force to the earth terminal, the plasticity of the electromagnetic wave shielding layer and the spring back of the earth terminal are used. The earth terminal is opposed to the electromagnetic wave shielding layer inside the recess at the edge of the opening of the sheet material, and then a conductive paint is loaded into the opposed portion of the earth terminal and the electromagnetic wave shielding layer. By doing so, the ground terminal and the electromagnetic wave shielding layer are electrically connected via the conductive paint. According to this method, the switch unit according to each of the above inventions can be easily manufactured.

[0018]

1 is a plan view of a switch unit U according to an embodiment of the present invention, FIG. 2 is a plan view of a plate-like body 20 used in the switch unit U of FIG. 1, and FIG.
Is a plan view of the electromagnetic wave shielding member 50, FIG. 4 is an explanatory view showing a laminated structure of the electromagnetic wave shielding member 50, and FIG.
An enlarged cross-sectional view of a portion along the line -V, FIG. 5B shows V of FIG.
6 is an enlarged sectional view showing a modified example of a portion along the line -V, FIG. 6 is an enlarged sectional view of a portion along the line VI-VI in FIG. 1, and FIG. 7 is an electrical connection between the electromagnetic wave shielding member 50 and the ground terminal 40. It is explanatory drawing of a method.

The switch unit U of this embodiment is a switch unit used in a mobile communication device such as the portable telephone described with reference to FIG. 8, and it is premised that it is used in the same way as the conventional switch unit described with reference to FIG. It has become.

As shown in FIG. 1, the switch unit U is
The elongated electromagnetic wave shielding member 50 is attached so as to form a flat and elongated plate piece and cover almost the entire surface of the elongated plate body 20. The switch parts 3 are provided on both left and right sides of the plate-like body 20 made of an electrically insulating synthetic resin molded body.
Nos. 0 and 30 are provided, and a ground terminal 40 is projected at one end thereof, and the ground terminal 40 and the electromagnetic wave shielding member 50 are electrically connected.

The plate-shaped body 2 as shown in FIG. 2 or FIG.
Circular recesses 21 are provided on both left and right sides of 0, and two fixed electrodes of the center electrode 31 and the peripheral electrode 32 are exposed in a flush state on the bottom surface of each recess 21. The lead portions 33 and 34, which are connected to the center electrode 31 and the peripheral electrode 32, are embedded in the plate-shaped body 20. Further, a contact piece 35 is continuously provided on the lead portion 33 of the center electrode 31 and the ground terminal 40, and these are projected from the plate-shaped body 20. In addition, these contact pieces 35
Are folded back at their roots and are provided on the back side of the plate-shaped body 20.

As shown in FIG. 5 (A), the movable electrode 36, which is a circular dome-shaped snap plate, is accommodated in the recessed portion 21 of the plate-shaped body 20 without large rattling. While the peripheral portion 36a of the movable electrode 36 overlaps and is in constant contact with the peripheral electrode 32, the central portion (top portion) of the movable electrode 36 faces the central electrode 31 with a space, and The movable electrode 36 faces the opening 21 a of the recess 21. The switch section 30 is formed by the two fixed electrodes of the center electrode 31 and the peripheral electrode 32 and the movable electrode 36 formed of the snap plate.

The electromagnetic wave shielding member 50 is formed of a sheet material having conductivity and flexibility. In this embodiment, the laminated body having the structure shown in FIG. 4 is used as the sheet material forming the electromagnetic wave shielding member 50. Specifically, the sheet material forming the electromagnetic wave shielding member 50 is a laminated body having two layers, a base layer 51 made of a polyethylene terephthalate film (PET film) and an electromagnetic wave shielding layer 52 made of an aluminum thin film. The adhesive layer 53 is held on the base layer 51. Further, the electromagnetic wave shielding member 50 is provided with an opening 54 through which the earth terminal 40 provided on the plate-shaped body 20 side is inserted. The electromagnetic wave shielding member 50 made of the sheet material is attached to the plate-shaped body 20 in an overlapping manner with the adhesive layer 53 interposed therebetween, and the earth terminal 40 is inserted into the opening 54 of the electromagnetic wave shielding member 50. And Fig. 6
As described above, the ground terminal 40 and the electromagnetic wave shielding member 50 are electrically connected via the conductive substance 60 made of a conductive paint. More specifically, in the electromagnetic wave shielding member 50 attached to the plate-shaped body 20 via the adhesive layer 53, the electromagnetic wave shielding layer 52 is located at the outermost layer, and the opening 54 is formed.
The electromagnetic wave shielding layer 52 facing the ground terminal 40 at the edge portion of is electrically connected to the ground terminal 40 via the conductive material 60.

In this embodiment, as shown in FIG. 6, the ground terminal 40 is projected into the recess 23 from the wall surface of the recess (opening in the illustrated example) 23 formed in the plate-like body 20 to provide the conductivity. The electrical connection between the ground terminal 40 and the electromagnetic wave shielding layer 50 by the conductive substance 60 is housed in the recess 23. For this reason, when electrically connecting the electromagnetic wave shielding layer 52 to the ground terminal 40, a conductive coating material having fluidity in a softened state is poured between the ground terminal 40 and the electromagnetic wave shielding layer 50, and then left standing. It only needs to be hardened, and it does not require extra parts such as springs or troublesome machining work such as caulking. In addition, since the electrical connection between the ground terminal 40 and the electromagnetic wave shielding layer 52 does not protrude from the plate-shaped body 20, the switch unit U does not become bulky and the installation space is small.

According to the switch unit U constructed as described above, when the movable electrode 36 of the switch portion 30 is pushed in to perform the inversion operation from the initial shape, the movable electrode 3
When the center electrode 31 and the peripheral electrode 32 are short-circuited by 6, and the movable electrode 36 performs the operation of returning from the inverted shape to the initial shape, the short-circuit between the center electrode 31 and the peripheral electrode 32 is released. Therefore, as shown in FIG. 8, the mobile phone case 1
When the switch unit U is installed inside the and the operating member 5 of the switch unit U is provided in the opening 6 formed on the side surface of the case 1, the operating member 5 is pushed in to operate the switch unit U. The on / off mode of the switch unit 30 is controlled. At that time, the pushing operation of the operating member 5 is converted into the reversing operation of the movable electrode 36a through the bending deformation of the electromagnetic wave shielding member 50 made of a flexible sheet material, and the returning operation of the movable electrode 36a is performed. Since the electromagnetic wave shielding member 50 made of the above-mentioned sheet material is converted into the returning operation of the operating member 5 through the bending deformation, the snap plate (the movable electrode 3) adopted in the switch unit 30 is used.
A situation in which the electromagnetic field shielding member 50 impairs the operation feeling of the operation member 5 associated with the reversing operation of 6) is less likely to occur, and a good operation feeling can be obtained.

Further, due to the electromagnetic wave shielding effect of the electromagnetic wave shielding member 50 which is attached to the plate-shaped body 10 in an overlapping manner and has conductivity, the lead portions 33 and 34 embedded in the plate-shaped body 20 and the switch portion. 30 is electromagnetic wave shielded.

Furthermore, since the electromagnetic wave shielding member 50 covers the switch section 30, there is no risk that dust will enter the switch section 30 from the outside and the switching performance and operability of the switch section 30 itself will be impaired.

In addition, since the sheet material forming the electromagnetic wave shielding member 50 has the base layer 51 made of a polyethylene terephthalate film, the electromagnetic wave shielding member 50 has excellent durability exhibited by the polyethylene terephthalate film. As a result, the electromagnetic wave shielding layer 52 made of an aluminum thin film is less likely to be damaged, and the initial electromagnetic wave shielding function is maintained for a long period of time.

In this embodiment, as shown in FIG. 5A, the electromagnetic wave shielding member 50 made of a flexible sheet material adhered to the plate-shaped body 20 is used to form the recess 21 of the plate-shaped body 20.
However, instead of such a structure, as shown in FIG. 5B, the electromagnetic wave shielding member 50 made of a sheet material is provided on the outer peripheral portion of the opening 21a of the recess 21. A valley-shaped annular flexible portion 55 pushed into the opening 21 is formed, and a circular portion 56 of the electromagnetic wave shielding member 50 surrounded by the flexible portion 55 is surrounded by the movable electrode 3.
Adopting a configuration in which the surface of the snap plate forming 6 is closely adhered, the flexible portion 55 of the electromagnetic wave shielding member 50 follows the reversing operation of the movable electrode 36 formed of the snap plate without resistance. Since the tension is not generated in the sheet material, the movable electrode 36
There is no room for a situation in which the operation feeling of the operation member 5 associated with the reversing operation is impaired by the tension generated in the electromagnetic wave shielding member 50 made of the sheet material described above, and a good operation feeling is obtained.

Next, a method of electrically connecting the electromagnetic wave shielding member 50 and the ground terminal 40 in the switch unit U will be described with reference to FIGS. 6 and 7.

At the first stage, as shown in FIG. 7, the ground terminal 40, which is a spring piece having elasticity, is passed from the wall surface of the recess 23 of the plate-shaped body 20 through the inside of the recess 23 to the recess 23. The earth terminal 40 is projected to the outside,
An electromagnetic wave shielding member 50 made of a sheet material as shown in FIG.
The electromagnetic wave shielding member 50 is aligned with and superposed on the plate-shaped body 20 while being inserted into the opening 54 provided in the plate-shaped body 20, and the electromagnetic wave shielding member 50 is attached to the plate-shaped body 20 via the adhesive layer 53.

Next, as shown in FIG. 7B, the jig 70 is used to push the ground terminal 40 into the recess 23 as indicated by the arrow d, and the ground terminal 4 is pushed through the work.
At 0, the edge 54a of the opening 54 of the electromagnetic wave shielding member 50 is also pushed into the recess 23. Subsequently, when the pushing force on the ground terminal 40 is released, the electromagnetic wave shielding layer 52 of the electromagnetic wave shielding member 50 is formed of an aluminum thin film, and
Since the ground terminal 40 is formed of a spring piece having elasticity, the edge portion 5 of the opening 54 of the electromagnetic wave shielding member 50 is formed by the plasticity of the electromagnetic wave shielding layer 52 as shown in FIG. 7C.
4a remains in the pushed-in position as it is, and the ground terminal 40 slightly returns due to its springback and faces the electromagnetic wave shielding member 50 inside the recess 23 with a gap. Therefore, a conductive paint is poured and loaded into a position where the earth terminal 40 and the electromagnetic wave shield layer 52 of the electromagnetic wave shield member 50 face each other, so that the conductive paint (the conductive substance 60) is interposed as shown in FIG. The electromagnetic wave shielding layer 52 and the ground terminal 40 are electrically connected.

According to this method, it is possible to electrically connect the electromagnetic wave shielding member 50 and the ground terminal 40 quickly and reliably.

[0034]

As described above, according to the switch unit of the present invention, the electromagnetic wave shielding member ensures the dust-proof property of the switch portion, and the switching performance and operability of the switch portion itself are less likely to be impaired. However, it is possible to provide the switch unit in which the operation feeling of the operation member due to the reversing operation of the snap plate employed in the switch portion is not easily impaired. In addition, it is possible to reliably electrically connect the conductive portion of the electromagnetic wave shielding member made of a sheet material and the ground terminal on the body side without using a spring or caulking.

According to the method of electrically connecting the electromagnetic wave shielding member and the ground terminal in the switch unit according to the present invention, the above dustproof property can be obtained by using a sheet material having conductivity and flexibility for the electromagnetic wave shielding member. If secured,
This makes it possible to securely and easily electrically connect the conductive portion of the sheet material to the ground terminal.

[Brief description of drawings]

FIG. 1 is a plan view of a switch unit according to an embodiment of the present invention.

FIG. 2 is a plan view of a plate-shaped body used in the switch unit of FIG.

FIG. 3 is a plan view of an electromagnetic wave shielding member.

FIG. 4 is an explanatory view showing a laminated structure of an electromagnetic wave shielding member.

5A is an enlarged sectional view of a portion taken along the line VV of FIG. 1, and FIG. 5B is an enlarged sectional view showing a modified example of a portion taken along the line VV of FIG.

FIG. 6 is an enlarged cross-sectional view of a portion taken along the line VI-VI of FIG.

FIG. 7 is an explanatory diagram of a method of electrically connecting an electromagnetic wave shielding member and a ground terminal.

FIG. 8 is a partially omitted external view of a mobile phone adopting a switch unit.

FIG. 9 is a plan view of a conventional switch unit.

[Explanation of symbols]

U switch unit 5 operation member 20 plate-shaped body 21 recessed portion 21a recessed portion opening 23 recess 30 switch portion 31 center electrode (fixed electrode) 32 peripheral electrode (fixed electrode) 36 movable electrode (snap plate) 33, 34 lead Part 40 Ground terminal 50 Electromagnetic wave shielding member 51 Base layer (polyethylene terephthalate film) 52 Electromagnetic wave shielding layer (aluminum thin film) 53 Adhesive layer 54a Opening edge 54 Opening 55 Flexible part 60 Conductive substance (conductive paint)

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 5E321 BB21 BB44 CC16 GG05                 5G006 AA01 AB25 AZ09 BB03 CB05                       DB03 FB04 FB39

Claims (8)

[Claims] 1. An electrically insulating plate-shaped body formed of a synthetic resin molded body is provided with a fixed electrode of a switch part and a movable electrode as a counterpart electrode of the fixed electrode, and the movable electrode is the plate-shaped body. The movable electrode is housed in the recessed portion provided in the above and faces the opening of the recessed portion, and the movable electrode is pushed by the operating member to perform the reversing operation from the initial shape and the pushing force by the operating member is When released, it is a snap plate that returns from the inverted shape to the initial shape, the lead part connected to the fixed electrode is embedded in the plate body, and the electromagnetic wave shielding member is superposed on the plate body. In the switch unit, the electromagnetic wave shielding member is formed of a sheet material having conductivity and flexibility, and the sheet material closes the opening of the recess. The conductive portion of the sheet material and the ground terminal provided on the plate-shaped body are electrically connected via a conductive substance that has fluidity in a softened state and hardens to harden to reduce fluidity. Switch unit characterized by. 2. The switch unit according to claim 1, wherein the sheet material is a laminate of a base layer made of a polyethylene terephthalate film and an electromagnetic wave shielding layer made of an aluminum thin film. 3. The sheet material is a laminated body having two layers of a base layer made of a polyethylene terephthalate film and an electromagnetic wave shielding layer made of an aluminum thin film, and the base layer is the plate-like body with an adhesive layer interposed therebetween. The switch unit according to claim 2, which is attached to the switch unit. 4. The sheet material is formed with an annular flexible portion that is pressed into the inside of the opening at the outer periphery of the opening of the recess, and is surrounded by the flexible portion of the sheet material. The switch unit according to any one of claims 1 and 3, wherein the broken portion is in close contact with the surface of the snap plate. 5. The earth terminal projecting from the plate-shaped body is inserted into an opening formed in the sheet material, which is the laminated body in which the outermost layer is formed of the electromagnetic wave shielding layer. 5. The earth terminal and the electromagnetic wave shielding layer facing the earth terminal at the rim of the opening are electrically connected via a conductive substance. Switch unit described in. 6. The switch unit according to claim 5, wherein the conductive substance is a conductive paint. 7. The ground terminal projects from the wall surface of the recess formed in the plate-shaped body into the recess, and an electrically connecting portion between the ground terminal and the electromagnetic wave shielding layer by a conductive material is provided. The switch unit according to any one of claims 2 to 6, which is housed in the recess. 8. A lead part connected to the fixed electrode is embedded in an electrically insulating plate-like body having a switch part having a fixed electrode and a movable electrode as a counterpart electrode of the fixed electrode, and In the method for electrically connecting the electromagnetic wave shielding member in the switch unit in which the electromagnetic wave shielding member is superposed on the plate-shaped body and the ground terminal provided on the plate-shaped body, the electromagnetic wave shielding member is made of polyethylene terephthalate film. A sheet material having conductivity and flexibility formed of a laminate of a base layer and an electromagnetic wave shielding layer made of an aluminum thin film is used. From the wall surface of the recess formed in the plate-like body to the inside of the recess. Through the opening provided in the above-mentioned sheet material with an elastic ground terminal protruding to the outside of the recess through A sheet material on the plate-shaped body, and then by pushing the ground terminal into the recess, the ground terminal also pushes the edge portion of the opening of the sheet material into the recess. After pushing into the earth terminal, the pushing force to the earth terminal is released to utilize the plasticity of the electromagnetic wave shielding layer and the spring back of the earth terminal to cause the earth terminal to move the electromagnetic wave to the electromagnetic wave at the edge of the opening of the sheet material. The shield layer is made to face the inside of the recess, and then a conductive paint is loaded in a portion where the ground terminal and the electromagnetic wave shield layer face each other, so that the ground terminal and the electromagnetic wave shield are provided through the conductive paint. A method for electrically connecting an electromagnetic wave shielding member and a ground terminal in a switch unit, characterized in that the layer is electrically connected.