JP2003234037A - Dome switch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dome switch capable of improving workability in its electrical connecting, and reducing a housing space. <P>SOLUTION: A dome switch 22 comprises: a front sheet 25 having a dome shape projections 32 which project to the outer surface side but reversible in the projecting direction, and also have an electrode 33 on respective inside surface; FPC 27 (circuit body) which has contact points 39 for contacting with the electrodes 33 respectively, when respective projections 32 are reversed to the inside; and a circuit body supporting plate 28 being tight on the FPC 27. In such a structure, a connector housing 41 is formed in the circuit body supporting plate 28, and an external connecting portion 37 led out from the FPC 27 is fixed on the inside surface of the connector housing 41. <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 front sheet having a dome-shaped projecting portion, a movable contact which is displaced when the protruding portion is reversed, and a stationary contact which opposes the movable contact. And a circuit body having side contacts.

[0002]

2. Description of the Related Art In FIG. 10, reference numeral 1 indicates a conventional dome switch. The dome switch 1 is
The front sheet 2, the spacer sheet 3, and the circuit body 4 are provided (see, for example, Patent Document 1). A plurality of protrusions 5 are formed on the front sheet 2. Its protrusion 5
Is formed in a dome shape that protrudes to the outer surface side of the front sheet 2 and can be inverted to the inner surface side. Also, the protrusion 5
An electrode (not shown) for the circuit body 4 is provided on the inner surface of the. On the other hand, on the outer surface of the front sheet 2, a flat design portion 6 expressing the switch type is formed by printing.

The spacer sheet 3 is provided to prevent the front sheet 2 from being deformed. Further, the spacer sheet 3 has an adhesive layer on the front and back surfaces thereof, and is formed so that the front sheet 2 and the circuit body 4 can be fixed to each other. A plurality of through holes (not shown) are formed in the spacer sheet 3 in accordance with the arrangement of the protrusions 5. The through hole is formed so that the above-mentioned electrode of the inverted protruding portion 5 contacts the circuit body 4. The circuit body 4 is provided with a plurality of unillustrated contacts for the electrodes.

[0004]

[Patent Document 1] Japanese Patent Laid-Open No. 2002-170454
(Page 3, Figure 1)

[0005]

By the way, in the electrical connection of the conventional dome switch 1, the circuit body 4 is used.
11 is formed into a thin film-shaped lead terminal 7, and the lead terminal 7 is connected to a connector 8
To make an electrical connection (reference numeral 9 indicates a board on which the connector 8 is mounted, and 10 indicates a lower case).

However, when inserting the thin film-shaped lead terminal 7 into the connector 8, it is necessary to pay attention to the insertion direction (straight insertion) and to avoid bending. Have
Also, in consideration of the insertion work into the connector 8, the lead terminal 7
Has a problem that it must be formed for a long time. Further, after the electrical connection, the lead terminal 7 has the extra length portion 11 as shown in the figure.
There is a problem that it is necessary to secure a storage space for.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a dome switch capable of improving the workability of electrical connection and reducing the storage space. .

[0008]

The dome switch according to the present invention, which has been made to solve the above-mentioned problems, has a dome-shaped projecting portion projecting to the outer surface side and reversible to the inner surface side. And a circuit body having a movable-side contact that is displaced when the protrusion is reversed and a fixed-side contact that faces the movable-side contact and is in contact with the movable-side contact. It is characterized by further comprising a plate member that has a housing and is in close contact with the circuit body, and an external connection portion drawn out from the circuit body is fixed to an inner surface of the connector housing.

A dome switch according to a second aspect of the present invention is the dome switch according to the first aspect, wherein the fixed portion of the external connection portion is expanded to a range extending to an end portion and an outer surface of the connector housing. Is characterized by.

A dome switch according to a third aspect of the present invention is the dome switch according to the first or second aspect, wherein as the plate member, a circuit body reinforcing plate dedicated to the switch, a panel at an installation destination, and a panel at an installation destination. It is characterized by using one of the front walls of the equipment.

According to the present invention described in claim 1,
A portion having a function as a connector for electrical connection is formed on the plate member. As a result, electrical connection is established with the connection partner by connector connection.
Further, the connection is possible without providing the extra length portion, and as a result, it is not necessary to secure a storage space for the extra length portion.

According to the invention described in claim 2,
The fixed portion of the external connection portion extends over the end portion and the outer surface of the connector housing. This makes it difficult for the external connection portion to shift when the connector is connected to the connection partner.

According to the present invention described in claim 3,
Any one of the circuit body reinforcing plate dedicated to the switch, the installation destination panel, and the front wall of the installation destination device is used as the plate member.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing an embodiment of the dome switch of the present invention. 2 is an exploded sectional view of FIG.

In FIGS. 1 and 2, reference numeral 21 indicates a switch device such as a remote control device (remote control device; not limited to this). The switch device 21 is a dome switch 22 of the present invention having a function as an upper case (cover).
And a lower case 23 that is an engagement partner of the dome switch 22, and a circuit device 24 housed in the lower case 23.
And is configured. First, the above-mentioned components will be described.

The dome switch 22 is a front sheet 2
5, a spacer sheet 26, an FPC 27 (corresponding to the circuit body described in the claims), a circuit body reinforcing plate 28 as a plate member, and an electrode 33 and a contact 39 described later. ing.

The front sheet 25 includes a front sheet main body 29,
The front sheet main body 29 has a front sheet side portion 30 connected to the peripheral edge thereof. The front sheet 25 is formed by the front sheet main body 29 and the front sheet side portion 30 into a shallow box shape having an open space 31 on the inner surface side of the front sheet main body 29.

The front sheet 25 is a transparent sheet member made of synthetic resin made of polyethylene terephthalate (PET) (whether or not it has flexibility), and the front sheet main body 29 has a plurality of protrusions 32. Are formed. Further, the front sheet main body 29 and the front sheet side portion 3
A design portion (not shown) is provided on the inner surface of 0 (the design portion also includes the background color).

The protrusion 32 is formed by applying a heat press (pressure is applied from the inner surface side to the outer surface side of the front sheet main body 29). Further, the protruding portion 32 is formed in a dome shape that protrudes to the outer surface side of the front sheet main body 29 and can be inverted to the inner surface side. An electrode 33 (corresponding to a movable side contact described in the claims) is formed on the top of the inner surface of the protrusion 32 with respect to the FPC 27. The electrode 33 is made of carbon or the like (printed in the case of carbon).

The design portion not shown is the front sheet body 29.
And printing and / or decoration applied to the inner surface of the front sheet side portion 30, for example, “ON”, “OFF”, “U”.
Printed characters such as “P”, “DOWN”, “1”, ... And background color correspond to the design portion (the electrode 33 is provided after these printings).

The spacer sheet 26 is a sheet member made of synthetic resin (for example, polyethylene terephthalate (PET)) and functions as a member for preventing the deformation of the front sheet 25 (having flexibility). The presence / absence is arbitrary. It is also possible to adjust the thickness to function as a member for ensuring the stroke dimension of the protrusion 32). Further, the spacer sheet 26 has adhesive sheets 34, 34 on the front and back surfaces, and the front sheet main body 29 and the FPC 27 can be fixed to the front and back surfaces, respectively. In such a spacer sheet 26, a plurality of through holes 35 and a plurality of air escape portions (not shown) are formed.

The through-holes 35 are formed in accordance with the positions of the corresponding protrusions 32 by a processing method such as punching. In addition, the through hole 35 corresponds to the corresponding protruding portion 32.
Is formed to have a diameter larger than that of the projection 32 (may be the same as the diameter of the protrusion 32). The inverted protrusion 32 is inserted into the through hole 35.

The air escape portion (not shown) has, for example, a slit shape and is formed between the through holes 35 by a processing method such as punching. In addition, the air escape portion is formed so as to communicate with the corresponding through hole 35. The air escape portion appropriately escapes the air pushed out when the protrusion 32 is reversed.

The FPC 27 (FPC: flexible printed circuit) comprises a circuit body 36, an external connecting portion 37, and an adhesive sheet 38. The circuit body 36 has a plurality of circuits (not shown) arranged in a desired pattern. The circuit body 36 has a plurality of contacts 39 (fixed in the claims) on the spacer sheet 26 side. Corresponding to the side contact) is formed. Further, the circuit body 36 is formed with an air escape hole (not shown) that communicates with the air escape portion (not shown) of the spacer sheet 26. The electrode 39 provided on the protrusion 32 comes into contact with the contact 39 so that conduction is obtained. The adhesive sheet 38 is provided on the circuit body reinforcing plate 28 side of the circuit body 36 and the external connection portion 37.

The external connection portion 37 is a portion used for electrical connection to the outside, and is formed in a film-like thin lead terminal shape. Further, the external connection portion 37 has flexibility and is formed so as to be pulled out from the circuit body main body 36. Further, the external connecting portion 37 is fixed to a connector housing 41 of the circuit body reinforcing plate 28 described later. A terminal circuit (not shown) connected to a circuit (not shown) of the circuit body 36 is arranged in the external connection portion 37.
In the present embodiment, the terminal circuit has a function as a connection terminal.

The circuit body reinforcing plate 28 is a plate member made of a synthetic resin that adheres closely to the FPC 27 and compensates for the insufficient strength of the FPC 27, and is located at a predetermined position on the surface side facing the circuit device 24. A connector housing 41 having an open portion 40 penetrating therethrough is formed in a protruding manner. The connector housing 41 is formed in a rectangular frame shape having a predetermined height, and an external connection portion 37 is shown in the drawing in a part of a range extending over the inner surface, the end portion, and the outer surface. It is designed to be fixed in a substantially U-shape (adhesive sheet 3
8 is used. Only the inner surface may be fixed).

The connector housing 41 and the external connection part 37 constitute a connector part 42 which is connected to a connector 49 of the circuit device 24, which will be described later.

The lower case 23 is made of synthetic resin and is formed to have a bottom wall 43 and a side wall 44 connected to the peripheral edge of the bottom wall 43. Further, inside the lower case 23, holding portions 45, 45 for the dome switch 22 and the circuit device 24 are formed vertically. At the tip of the side wall 44, the front sheet side portion 3
An engaging portion 46 for 0 is formed.

The circuit device 24 has a known substrate 47.
And a plurality of electronic components 48 and a connector 49 mounted on the board 47. A plurality of circuits (not shown) having a desired pattern are arranged on the substrate 47. The connector 49 includes a connector housing 50 fixed to the board 47 and the connector housing 50.
And the connection terminal 51 accommodated in the. Connection terminal 5
1 is connected to a circuit (not shown) on the substrate 47.

In the above structure, the dome switch 22
Adheres the front sheet body 29 of the front sheet 25 to the front surface side of the spacer sheet 26 and the FPC 27 to the rear surface side of the spacer sheet 26 while adhering them to the circuit body reinforcing plate 28 from the FPC 27 side. It is assembled by fixing.

Further, the switch device 21 having such a dome switch 22 has a holding portion 4 of the lower case 23.
5, the circuit device 24 is held, and the dome switch 22 is put on the circuit device 24 to fix it. At this time, the connector portion 4 of the dome switch 22
2 and the connector 49 of the circuit device 24 are connector-connected. That is, at the same time as fixing the dome switch 22 to the lower case 23, the electrical connection is completed and the switch device 21 enters the ASSY state.

Next, the operation of the dome switch 22 will be described. In the state where the load is not applied to the protrusion 32 before the switch operation, due to the shape retention of the protrusion 32 itself,
The shape is retained. When the operator performs a switch operation to press down the protruding portion 32, the protruding portion 32 buckles and reverses at a certain load while resisting the load due to the pressing (at this time, a click feeling is generated). When the protruding portion 32 buckles or reverses, the above load is reduced, and the pressing of the protruding portion 32 proceeds smoothly. The inverted protrusion 32 is inserted into the through hole 35 of the spacer sheet 26, and the electrode 33 provided on the protrusion 32 contacts the contact 39 of the FPC 27 via the through hole 35.

As a result, a circuit (not shown) of the FPC 27 becomes conductive, and the dome switch 22 is turned on. On the other hand, when the load is released, the protrusion 32 returns to the original state. Then, along with this, the conduction state is released and the dome switch 22 is turned off.

As described above, since the dome switch 22 has the connector portion 42 having the above structure, the dome switch 22 can be easily electrically connected to the connector 49 of the circuit device 24. Further, the dome switch 22 does not need to be provided with an extra length portion as in the prior art, and it is possible to eliminate the need to secure a storage space for the extra length portion. Therefore, the dome switch 22 of the present invention can improve the workability of electrical connection and reduce the storage space.

Next, an example in which the installation target of the dome switch 22 is changed will be described with reference to FIG. Figure 3
[Fig. 3] is a cross-sectional view showing an example in which the installation target is changed. Note that basically the same components and parts as those described above are designated by the same reference numerals, and description thereof will be omitted.

In FIG. 3, the switch device indicated by reference numeral 52 comprises a dome switch 22 and a shallow bottom case 53 which is an engagement partner of the dome switch 22. The connector 54 is electrically connected to the switch device 52 having such a configuration through the lower case 53.

The lower case 53 is made of synthetic resin and is formed to have a bottom wall 55 and a side wall 56 connected to the peripheral edge of the bottom wall 55. A holding portion 45 for the dome switch 22 is formed inside the lower case 53. At a predetermined position of the bottom wall 55, an opening 57 is formed in which the connector 54 is inserted.
An engaging portion 46 for the front sheet side portion 30 is formed at the tip portion of the side wall 56.

The connector 54 has a connector housing 58 and a connection terminal 51 housed in the connector housing 58. Further, the connector 54 is provided at the end of the connecting cord 59. When the connector housing 58 is formed in a shape as shown in the figure, it can be slidably contacted with the external connection portion 37 fixed to the outer surface side of the connector housing 41 when the connector is connected. This can contribute to the prevention of the deviation of 37.

In the above configuration, the switch device 52
Is assembled by covering and fixing the dome switch 22 from above the lower case 53. When the connector 54 is connector-connected to the connector portion 42 of the dome switch 22 through the opening 57, the switch operation as described above becomes possible.

Next, another embodiment of the dome switch according to the present invention will be described with reference to FIGS. 4 and 5. FIG. 4 is a sectional view showing another embodiment, and FIG.
Is an exploded sectional view. Note that basically the same components and parts as those described above are designated by the same reference numerals, and description thereof will be omitted.

In FIGS. 4 and 5, for example, a switch device 60 for the same purpose as described above is a dome switch 61 of the present invention having a function as an upper case (cover).
And a lower case 62 that is an engagement partner of the dome switch 61, and the circuit device 24 housed in the lower case 62.
And is configured.

The dome switch 61 includes a front sheet 63 of the same material and shape as the front sheet main body 29 (see FIGS. 1 and 2), a spacer sheet 26, and an FPC 27.
And the circuit body reinforcing plate 28, and the electrode 33 and the contact 39. That is, the dome switch 61 of the present embodiment is formed in the same manner as the dome switch 22 described in FIGS. 1 and 2 with the front sheet side portion 30 omitted.

The lower case 62 has the side wall 4 with the bottom wall 43 and the engaging portion 46 (see FIGS. 1 and 2) omitted.
And 4 are provided. Further, inside the lower case 62, holding portions 45, 45 for the dome switch 61 and the circuit device 24 are formed vertically. That is, the lower case 62 of this embodiment is formed in the same manner as the lower case 23 described in FIGS. 1 and 2 with the engaging portion 46 omitted.

In the above configuration, the switch device 60
Is assembled by holding the circuit device 24 in the holding portion 45 of the lower case 62 and covering and fixing the dome switch 61 from above. At this time, the connector portion 42 of the dome switch 61 and the connector 49 of the circuit device 24 are connector-connected. That is, at the same time when the dome switch 61 is fixed to the lower case 62, electrical connection is completed and the switch device 60 enters the ASSY state. Therefore, the same effect as described above can be obtained.

Next, still another embodiment of the dome switch according to the present invention will be described with reference to FIGS. 6 to 8. FIG. 6 is a sectional view showing still another embodiment, FIG. 7 is an exploded sectional view, and FIG. 8 is a perspective view showing an installation example. Note that basically the same components and parts as those described above are designated by the same reference numerals, and description thereof will be omitted.

In FIGS. 6 and 7, reference numeral 64 indicates a dome switch of the present invention. The dome switch 64 includes a front sheet 63, a spacer sheet 26,
The FPC 27 and the installation destination panel 65 are provided, and the electrode 33 and the contact 39 are provided. The connector 5 is attached to such a dome switch 64.
4 is electrically connected.

The panel 65 is a plate member made of synthetic resin capable of compensating for insufficient strength of the FPC 27, and a shallow recess 66 is formed at a predetermined position of the panel 65. The recess 66 is formed so that the front sheet 63, the spacer sheet 26, and the FPC 27 can be stored in a vertically stacked state (a sub-ASSY state of the dome switch). A connector housing 41 having an open portion 40 is formed at a predetermined position of the recess 66 so as to project therefrom. Reference numeral 67 indicates a connector portion (which has the same configuration and structure as the connector portion 42 described above).

In the above structure, the dome switch 64
Is assembled by adhesively fixing the front sheet 63 to the front surface side of the spacer sheet 26 and fixing the FPC 27 to the rear surface side of the spacer sheet 26, and then adhesively fixing them from the FPC 27 side to the recess 66.
At this time, the external connection portion 37 is pulled out to the rear surface side of the panel 65 through the open portion 40, and is fixed in a substantially U-shaped state as shown in the drawing. Then, when the connector 54 is connected to the connector portion 67 of the dome switch 64 on the rear surface side of the panel 65, the switch operation as described above becomes possible.

As described above, since the dome switch 64 has the connector portion 67 having the above-mentioned structure, the dome switch 64 can be easily electrically connected to the connector 54. Further, the dome switch 64 does not need to be provided with an extra length portion as in the conventional case, and it is not necessary to secure a storage space for the extra length portion. Therefore, the dome switch 64 of the present invention can improve the workability of electrical connection and reduce the storage space.

The panel 65 may be an instrument panel 68 of a vehicle as shown in FIG. 8, for example. Further, the front wall 6 of the device provided on the instrument panel 68 in place of the recess 66
It is also possible to apply 9 as a plate member. In FIG. 8, reference numeral 70 is a dome switch sub-ASSY (for example, the front sheet 63, the spacer sheet 26,
And the FPC 27 are laminated in the vertical direction and have an external connection portion 37). Further, the reference numeral 71 is
Opening portion (opening portion 4) of the connector housing (not shown)
(Same as 0).

In addition, it goes without saying that the present invention can be modified in various ways within the scope of the present invention. Also,
Needless to say, the above dome switch can be applied to various fields such as automobiles, home appliances, audio equipment, and mobile phones. The circuit body is not limited to the FPC 27. Further, the dome switch may have a configuration like the other configuration example of FIG. 9.

In FIG. 9, the dome switch indicated by reference numeral 141 includes a front sheet 142, a spacer sheet 143, a membrane sheet 144, a second spacer sheet (spacer sheet) 145, an FPC 146,
A plurality of adhesive layers 147 and an adhesive sheet 148 are provided, and a movable side contact point 149 and a fixed side contact point 150 are provided.

The front sheet 142 is a flexible sheet member made of, for example, polyethylene terephthalate (PET) or polyethylene naphthalate (PEN), which is made of a synthetic resin. Has a protruding portion 151.
The protruding portion 151 is formed in a dome shape that protrudes to the outer surface (front surface) side of the front sheet 142 and can be inverted to the inner surface (rear surface) side. Such a front sheet 142 is
Since it is made of the above material, it is originally transparent, and in the present embodiment, the above-mentioned characters and the like are printed on the inner surface or outer surface of the front sheet 142.

The spacer sheet 143 is a flexible resin sheet member made of, for example, polyethylene terephthalate (PET) or polyethylene naphthalate (PEN), and is used to prevent deformation of the front sheet 142 and to prevent protrusions 151. It is provided in order to realize air bleeding at the time of reversing and to secure the stroke size of the protrusion 151. The known adhesive layers 147 are provided on the front and back surfaces of the spacer sheet 143, respectively, so that the front sheet 142 and the membrane sheet 144 can be fixed to the front and back surfaces, respectively.

The spacer sheet 143 is formed in the through hole 152 corresponding to the position of the protrusion 151.
And an air escape portion (not shown). Through hole 1
52 is formed to have a diameter larger than the diameter of the protrusion 151 (may be the same as the diameter of the protrusion 151). The inverted protrusion 151 is inserted into the through hole 152.

The membrane sheet 144 is a flexible thin sheet member made of, for example, polyethylene terephthalate (PET) or polyethylene naphthalate (PEN) and having flexibility, and is provided at a predetermined position on the back surface with respect to the FPC 146. Movable contact 1
49 are provided.

The second spacer sheet 145 is a flexible resin sheet member made of, for example, polyethylene terephthalate (PET) or polyethylene naphthalate (PEN), and is used to prevent deformation of the membrane sheet 144 and to prevent the membrane sheet 144. It is provided to secure the stroke size of. Adhesive layers 147 are provided on the front and back surfaces of the second spacer sheet 145, respectively.
The PC 146 and the PC 146 can be fixed to the front and back surfaces, respectively. Such a second spacer sheet 14
5 has a through hole 153 formed corresponding to the position of the contact 149 on the movable side.

The FPC 146 is a circuit body,
A circuit body 154 having a switch circuit (not shown) arranged in a desired pattern and an external connecting means (not shown) used for electrical connection with the outside are provided. On the side of the second spacer sheet 145 of the circuit body 154, the contact 15 on the fixed side in contact with the contact 149 on the movable side
0 is provided (in addition, a light emitting element such as an LED may be provided. When the light emitting element is provided, for example, the spacer sheet 143 and the membrane sheet 1 are provided.
44, and a housing portion for the light emitting element that extends over the second spacer sheet 145 and has a light transmissive function). The external connection means (not shown) includes a wire connection circuit portion that is drawn out from the circuit body main body 154, and an edge connector terminal, for example, provided at the tip of the wire connection circuit portion.

The pressure-sensitive adhesive sheet 148 is the same as the pressure-sensitive adhesive sheet 38 (see FIG. 2) described above, has an adhesive fixing surface, and can be adhesively fixed to the circuit body reinforcing plate 155 as a plate member. Is formed. The circuit body reinforcing plate 155 is formed similarly to the circuit body reinforcing plate 28 (see FIG. 2) described above.

In the above structure, the dome switch 14
1 is assembled as follows. First, the front sheet 142
Are bonded and fixed to the surface of the spacer sheet 143. Then, the membrane sheet 144 is attached to the second spacer sheet 14
5, the FPC 146 is adhesively fixed to the back surface of the second spacer sheet 145. continue,
The membrane sheet 14 is provided on the back surface of the spacer sheet 143.
4, the second spacer sheet 145, and the switch portion composed of the FPC 146 are adhesively fixed, and these are attached to the FPC1.
Circuit board reinforcing plate 15 from the 46 side through the adhesive sheet 148
It is assembled by adhesively fixing to 5.

Then, such a dome switch 14
1 operates as follows in the assembled switch device (operation drawings are omitted).

Before the switch is operated, in the state where no load is applied to the protrusion 151, the shape is maintained by the shape retention of the protrusion 151 itself. Then, when the switch operation is performed and the protruding portion 151 is pressed in the arrow direction by the finger 156 of the person who operates the switch (a pressing operation of applying a load downward), the protruding portion 151 receives the load due to the pressing of the finger 156. While resisting, it buckles and reverses at a certain load (at this time, a click feeling occurs).

When the protrusion 151 buckles or reverses, the downward load is reduced, and the pressing of the protrusion 151 proceeds smoothly. The inverted protrusion 151 is further pushed and inserted into the through hole 152 of the spacer sheet 143 to press the membrane sheet 144. When the membrane sheet 144 is pressed, it bends, and the contact 149 on the movable side provided on the membrane sheet 144 becomes the second spacer sheet 1.
The contact 150 on the fixed side of the FPC 146 is contacted via the through hole 153 of 45.

As a result, the switch circuit (not shown) of the FPC 146 becomes conductive and the dome switch 141
Is turned on. On the other hand, when the finger 156 is released and the downward load is released, the membrane sheet 144 and the protrusion 15 are released.
1 returns to the original state. Along with this, the conduction state is released, and the dome switch 141 is turned off.

[0065]

As described above, according to the present invention as set forth in claim 1, there is further provided a plate member having a connector housing and in close contact with the circuit body, and the circuit body is provided on the inner surface of the connector housing. Since the external connection portion pulled out from is fixed, it is possible to make an electrical connection with the connection partner by the connector connection. Further, it is not necessary to provide an extra length portion as in the conventional case, and it is possible to eliminate the need to secure a storage space for the extra length portion. Therefore, there is an effect that the workability relating to the electrical connection can be improved and the storage space can be reduced.

According to the invention described in claim 2,
Since the fixed portion of the external connection portion is widened to the end portion and the outer surface of the housing, it is possible to prevent the external connection portion from being displaced when the connector is connected to the connection partner.

According to the present invention described in claim 3,
By using one of the circuit board reinforcing plate for the switch, the installation destination panel, and the front wall of the installation destination device as the plate member,
It is possible to improve the workability of the electrical connection and reduce the storage space.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a dome switch according to the present invention.

FIG. 2 is an exploded sectional view of FIG.

3 is a cross-sectional view showing an example in which the installation target of the dome switch of FIG. 1 is changed.

FIG. 4 is a sectional view showing another embodiment of the dome switch according to the present invention.

5 is an exploded cross-sectional view of FIG.

FIG. 6 is a sectional view showing still another embodiment of a dome switch according to the present invention.

FIG. 7 is an exploded sectional view of FIG.

FIG. 8 is a perspective view showing an installation example of the dome switch of FIG.

FIG. 9 is a cross-sectional view showing another configuration example of the dome switch.

FIG. 10 is a perspective view of a conventional dome switch.

FIG. 11 is a cross-sectional view of an essential part for explaining electrical connection of a conventional dome switch.

[Explanation of symbols]

21 Switch device 22 Dome switch 23 Lower case 24 circuit devices 25 front sheet 26 Spacer sheet 27 FPC (circuit body) 28 Circuit body reinforcing plate (plate member) 29 Front sheet body 30 Front seat side 32 protrusion 33 electrodes (moving side contact) 34 Adhesive sheet 35 through hole 36 circuit body 37 External connection 38 Adhesive sheet 39 contacts (fixed side contacts) 41 Connector housing 42 Connector part 49 connector 52 switch device 53 lower case 54 connector 60 switch device 61 Dome Switch 63 table sheet 64 dome switch 65 panels (plate members) 66 recess 67 Connector part 68 Instrument panel 69 Front wall (plate member) 141 dome switch 142 front sheet 143 spacer sheet 144 membrane sheet 145 Second spacer sheet (spacer sheet) 146 FPC (circuit body) 147 adhesive layer 148 Adhesive sheet 149 Movable contact 150 contacts on the fixed side 151 protrusion 152,153 through holes 154 Circuit body 155 Circuit body reinforcing plate (plate member) 156 fingers

Claims (3)

[Claims] 1. A front sheet having a dome-shaped projecting portion projecting to the outer surface side and reversible to the inner surface side, a movable side contact displaced when the projecting portion is reversed, and a movable side contact. A dome switch comprising: a circuit body having fixed-side contacts that face each other, and further comprising a plate member that has a connector housing and is in close contact with the circuit body, wherein the inner surface of the connector housing is provided. Is a dome switch having an external connection portion fixed from the circuit body fixed. 2. The dome switch according to claim 1, wherein the fixed portion of the external connection portion is widened to a range that extends to an end portion and an outer surface of the connector housing. 3. The dome switch according to claim 1, wherein the plate member is any one of a switch-dedicated circuit body reinforcing plate, an installation destination panel, and a front wall of an installation destination device. Dome switch characterized by that.