JP2000195371A - Membrane switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a membrane switch which allows improvement in reliability of electric continuity between connector terminals and wiring of a switch, and having a thin connector connection part. SOLUTION: On an upper a film 5a of this membrane switch, is formed out of plural electrodes and upper wiring connecting between the electrodes, while the surface of a lower film 5b is formed out of plural electrodes, lower wiring 9b connecting between the electrodes, and upper wiring connection wiring 9c connected to the upper wiring. A spacer is interposed between the upper film 5a and the lower film 5b, while the upper wiring and the upper wiring connection wiring 9c are connected electrically. External terminals 1e provided in a lower part of a B-B female connector 1 in a tail part 15, and the upper wiring connection wiring 9c and the lower wiring 9b are glued via a conductive adhesive 21, while a sealing resin agent 3 reinforces the glued part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a membrane switch which is used by being incorporated in a keyboard or the like of a personal computer, and has a tail portion provided with a connector for connection to another board or the like. The present invention relates to a membrane switch that can improve the reliability of electrical conduction with the wiring and reduce the thickness of the connector connection part.

[0002]

2. Description of the Related Art The structure of a conventional membrane switch will be described below. FIG. 11 is a schematic view showing a conventional first membrane switch, and FIG. 12 is a sectional view showing a conventional first membrane switch.

[0003] As shown in FIGS.
Is disposed on a support plate 108 made of a metal plate such as Fe and Al. A predetermined position on the surface of the upper film 105a made of polyethylene terephthalate (PET)
g and a plurality of upper electrodes 107a and
The upper wiring 109a connecting between 7a is formed by printing, thereby forming an upper electrode sheet. Note that these upper wirings 109a are connected to the upper film 1
The upper film 105a is provided with a U-shaped slit 113a that divides the wiring connection portion 113.

Similarly, a lower film 10 made of PET is used.
A plurality of lower electrodes 107b made of Ag, a lower wiring 109b connecting between the lower electrodes 107b, and an upper wiring connecting to the upper wiring 109a formed on the upper film 105a are provided at predetermined positions on the surface of the lower film 5b. The wiring 109c is formed by printing, whereby
A lower electrode sheet is configured. The lower wiring 10
9b and the upper wiring connection wiring 109c are integrated in the tail part 115a of the membrane switch 116a.
The upper electrode sheet and the lower electrode sheet are disposed so that the surfaces on which the upper electrode 107a and the lower electrode 107b are formed face each other, and are made of PET having a switch opening 106b at a position matching the electrodes between them. The spacer 106 is overlaid.

After the upper electrode sheet, the spacer 106 and the lower electrode sheet are strictly aligned by using a jig or the like, the tip of the fusion horn is placed in a region where no electrode, wiring, etc. are formed. The fusion parts are formed by ultrasonic waves oscillated from the tip of the fusion horn, and are adhered to each other. The fused portion 111 is usually formed at two places, and has a size of about 2.0 to 3.0.
It has a circular shape of 5 mm.

Further, the wiring connecting portion 113 on which the upper wiring 109a is formed and the region on the lower film 105b on which the upper wiring connecting wiring 109c is formed are formed by an anisotropic conductive adhesive disposed therebetween. For example, they are bonded and fixed via an anisotropic conductive film (not shown) and are electrically connected. This anisotropic conductive film is composed of a polymer as a main material, and is a connection material having three functions of an adhesive function, a conductive function, and an insulating function. And when this anisotropic conductive film is thermocompressed,
It exhibits electrical anisotropy in which conductivity is obtained in the thickness direction and insulation is obtained in the direction parallel to the surface. Therefore, the wiring connection portion 113 and the lower film 105
b are bonded and fixed, and the upper wiring 109a and the upper wiring connecting wiring 109c are electrically connected. In this way, the upper wiring 109a and the upper wiring connecting wiring 109c are electrically connected via the anisotropic conductive film 2 to form the membrane switch 116a.

Further, on the upper film 105a, a plastic base 1 constituting the key top portion 132 is formed.
24 are arranged. The base 124 has an opening at a position where a key is formed, that is, at a position matching the upper electrode 107a and the lower electrode 107b when the key top portion 132 is arranged on the membrane switch 116a.
A rubber cushion 123 is provided in the opening. The rubber cushion 123 includes a main body 123a having a projection 123c for pressing a switch, and a leg 123b supporting the main body 123a, whereby the main body 123a is separated from the upper surface of the upper film 105a. Supported by.

Further, above the rubber cushion 123, a plastic finger contact portion 121 supported by a support 122 is disposed. The support tool 122 supports the finger contact portion 121 in a state where two rod-shaped members locked to each other at the center cross each other. The end of the support 122 is locked so as to slide on the back side of the finger touching portion 121 and the upper side of the base 124. When the finger touching portion 121 is not pressed, the finger touching portion 121 is made of rubber. It is supported by the main body 123a of the cushion 123 and is lifted. Thus, the base 124, the rubber cushion 123, the support 1
The key top portion 132 is configured by the 22 and the finger touch portion 121.

In the keyboard constructed as described above, when the finger touch portion 121 at a predetermined position is pressed by a finger, the rod-like members constituting the support 122 are linearly overlapped, and at the same time, the leg of the rubber cushion 123 is moved. The portion 123b is bent, and the main body portion 123a is pressed downward. Then, the protrusion 123c of the rubber cushion 123 presses the switch portion of the membrane switch 116a, and the upper electrode 107a and the lower electrode 107b come into contact. Thereby, the upper wiring 109 formed on the upper film 105a is formed.
a and the lower wiring 109 formed on the lower film 105b
b, a current flows, and this information is transmitted to hardware (not shown) of the personal computer. Thereafter, when the finger contact portion 121 is opened, the leg portion 123b of the rubber cushion 123 returns to the original shape, the finger contact portion 121 is lifted, and the upper electrode 107a and the lower electrode 107b are separated.

A membrane switch in which an upper film, a spacer and a lower film are simply assembled has a total of two tail portions (male connectors) in the upper film and the lower film. Therefore, when this membrane switch is connected to a power supply and other wiring, it is necessary to insert the two connectors into separate female connectors.

Then, the upper wiring 109a is connected to the upper wiring connecting wiring 109c on the lower film 105b,
By handling the upper wiring 109a on the lower film 105b, the tail portion of the membrane switch is made only on the lower film 105b side, and connection with other wiring is facilitated.

When electrically connecting the wiring of the membrane switch 116a thus configured to a circuit of another substrate, for example, a substrate for a personal computer main body, the connection is made by the following method. In some cases, the connection between the wiring of the membrane switch and the circuit of the substrate for the personal computer is detached in an inspection process or the like, and therefore the connection is required to have mechanical strength.

As shown in FIG. 11, in the conventional first membrane switch 116a, the wiring (lower wiring 109b and upper wiring connecting wiring 109c) integrated at the tip of the tail 115a is exposed. The tip is a male connector. The lower film 105
b, the lower wiring 109b and the upper wiring connecting wiring 1
The surface on which the 09c is formed is covered with an upper protective tape for protecting the wiring from mechanical damage except for the tip portion via an adhesive (neither is shown). This tail part 11
The distal end of 5a is fitted into a connection port of a female connector (not shown) mounted on the personal computer main board, and the wiring of the membrane switch and the circuit of the personal computer main board are electrically connected.

FIG. 13 is a schematic view showing a tail portion of a second conventional membrane switch. In the conventional second membrane switch 116b, the membrane switch 1
16a having the same configuration as the tail portion 1
15b, a lower film 105b, and a lower wiring 109b and an upper wiring connecting wiring (not shown) formed on the surface of the lower film 105b are provided. On the surface of the lower film 105b on which the lower wiring 109b and the upper wiring connecting wiring 109c are formed, an upper protective tape 10 for protecting the wiring from mechanical damage except for the end portion.
5d is covered via the adhesive 141. And
With the exposed wiring arranged below, the wiring 11 for the personal computer main body formed on the surface of the substrate 119 for the personal computer main body.
9a, the surface of the lower film 105b on which the wiring is not formed is pressed by the pressing plate 117 via the rubber 117a.
Press. In this way, the wiring of the membrane switch and the wiring 119a for the personal computer main body are electrically connected.

Further, in the third conventional membrane switch, the wiring exposed on the surface of the tip of the tail portion and the circuit of the personal computer main board are connected via an anisotropic conductive adhesive, for example, an anisotropic conductive film. Electrically connected. With the anisotropic conductive film, the tail portion of the membrane switch and the personal computer substrate are bonded and fixed, and the wiring of the membrane switch and the circuit of the personal computer substrate are electrically connected.

However, the above-described conventional membrane switch has the following problems.

Conventional first membrane switch 116a
In the method, both ends of the tail part are connected by a male connector at the tip of the tail portion by a press-contact force caused by fitting to the female connector of the PC body substrate, so that the connection strength is small. In particular, it is weak against the force in the pull-out direction. Therefore, for example, when a force is applied to the tail portion 115a of the membrane switch or the female connector of the personal computer main board, the tail portion 115a easily shifts with respect to the female connector. Therefore, there is no electrical continuity between the two connectors,
Electrical continuity between the wiring of the membrane switch and the circuit of the PC body substrate is eliminated. Therefore, the electrical conduction reliability is low.

In addition, the conventional second membrane switch 1
16b, the wiring of the membrane switch and the wiring for the personal computer body are connected by the pressing force of the pressing plate 117.
6a, the connection strength is small. Therefore, when a force is applied to the connection between the tail portion of the membrane switch and the personal computer main board, the connection is easily displaced, and electrical connection at this connection is lost. That is, there is no electrical continuity between the wiring of the membrane switch and the circuit of the PC body substrate.
Therefore, the electrical conduction reliability is low.

Further, in the conventional first and second membrane switches, the wirings exposed on the tail portion are connected to the personal computer main board using the wirings themselves as connection surfaces, and are repeatedly attached and detached. Wiring is cut off. For this reason, there is a disadvantage that the migration resistance of the connection part is reduced. Note that migration is the movement of metal ions along a conductive path from one metal to the other metal when a voltage is applied between the two metals. As it proceeds, insulation deterioration or short circuit occurs.

On the other hand, in the third conventional membrane switch, since the wiring of the membrane switch and the circuit of the substrate for the personal computer are bonded and fixed by an anisotropic conductive film, they can be removed nondestructively. Can not. For this reason, it is not possible to carry out the inspection by removing them, and when necessary to remove them, it is necessary to break and remove either the membrane switch or the personal computer substrate. In this case, a high cost substrate for a personal computer is utilized.

Further, since the adhesive strength of the anisotropic conductive film is as small as about 5 (N / cm width) in peel (peeling) strength, the connection strength is low. Therefore, as in the case of the conventional membrane switches 116a and 116b, when a force is applied to the connection between the tail portion of the membrane switch and the personal computer main board, the connection is easily shifted. Therefore,
Electrical continuity at this connection is eliminated, and electrical continuity between the wiring of the membrane switch and the circuit of the personal computer main board is eliminated. Therefore, the electrical conduction reliability is low.

By the way, in order to solve the above-mentioned drawbacks, recently, a board-to-board compatible with a thin personal computer has been developed.
The use of connectors called board connectors (hereinafter referred to as BB connectors) to connect boards to each other is increasing. In this BB connector, the male connector has a convex portion, and the female connector has a concave portion. The convex portion and the concave portion are provided with matching terminals, and the convex portion is fitted into the concave portion. By joining, the male and female connectors are mechanically connected and electrically connected. Since the connection strength is high, the electrical conduction reliability is high and the detachability is excellent. . For example, in order to provide a female connector (hereinafter referred to as a BB female connector) of the BB connector on a tail portion (an extension portion provided with a connector for electrically connecting to another substrate) of the membrane switch. For example, a BB female connector is mounted on a glass epoxy connection board in advance, and the connection board is connected to the tail section. That is, the BB female connector is connected to the tail portion of the membrane switch via the connection board. FIG. 14 is a schematic view showing a tail portion of a fourth conventional membrane switch.

As shown in FIG. 14, a tail portion 115c of a conventional fourth membrane switch 116c is formed by using a lower film 105b as a base material, and a lower wiring 10
9b and an upper wiring connection wiring (not shown) are formed. Except for the tip, an upper protective tape 109d for protecting the wiring from mechanical damage is covered via an adhesive 141. Further, a connection substrate 11 made of glass epoxy is provided on the upper surface of the tip portion where the wiring of the tail portion 115c is exposed.
8 has a part of its lower surface connected via an anisotropic conductive film 102. Further, a BB female connector 101 is provided on the upper surface of the connection board 118.

The BB female connector 101 is provided with a connector concave portion 101a into which the convex portion of the male connector is fitted. A plurality of inter-connector terminals 101d are provided on a surface of the connector recess 101a facing the tail base, and a plurality of inter-connector terminals 1d are provided on the opposing surface.
01c is provided. Furthermore, BB female connector 1
A plurality of external terminals 101e corresponding to the inter-connector terminals 101c and 101d are provided below 01.

The inter-connector terminal 101c is electrically connected to the upper wiring connection wiring via the external terminal 101e, the anisotropic conductive film 102, and the wiring connecting them. Similarly, the inter-connector terminal 101d is electrically connected to the lower wiring 109b via the external terminal 101e, the anisotropic conductive film 102, and the wiring connecting them. Otherwise, the configuration is the same as that of the conventional first membrane switch 116a, and the description is omitted.

The BB male connector (not shown) which is paired with the BB female connector 101 has a connector projection (not shown) which fits into the connector recess 101a. An inter-connector terminal (not shown) corresponding to the inter-connector terminals 101c and 101d is provided on the outer surface of the connector convex portion, and the connector convex portion is fitted into the connector concave portion 101a to make the BB female connector 101 and B
When the B-male connector is connected, the inter-connector terminals 101c and 101d provided therein and the corresponding inter-connector terminals come into contact with each other, so that the wiring of the membrane switch and the board on which the BB male connector is mounted are formed. The circuit is electrically connected.

In the conventional fourth membrane switch 116c configured as described above, for example, when the BB male connector is mounted on the personal computer main board,
By connecting the BB female connector 101 and the BB male connector, it is possible to electrically connect the wiring of the membrane switch 116c and the circuit of the personal computer main board.

[0028]

However, as described above, in the conventional fourth membrane switch 116c, the tail portion 115c and the connection substrate 118 are bonded and fixed by the anisotropic conductive film 102 having low adhesive strength. Therefore, the connection strength of that portion is low. For this reason, there is a problem that electrical conduction reliability between the wiring of the membrane switch and the terminal of the BB female connector is low.

Further, since the BB female connector 101 is connected to the tail portion 115c via the connection board 118, there is a disadvantage that the thickness of the connector connection portion is large.

The present invention has been made in view of such a problem, and can improve the reliability of electrical conduction between a terminal of a connector and a wiring of a switch, and can reduce the thickness of a connector connecting portion. It is an object of the present invention to provide a membrane switch that can perform the operation.

[0031]

According to the present invention, there is provided a membrane switch comprising: a first insulating film and a second insulating film disposed to face each other;
A plurality of first electrodes provided on a surface facing the insulating film; a first wiring connected to the plurality of first electrodes; a wiring connection portion on which the first wiring is integrated; A slit selectively provided around the wiring connection portion in the film, a plurality of second electrodes provided on a surface of the second insulating film facing the first insulating film, and the plurality of second electrodes A second wiring connected to the first wiring, a connection wiring connected to the first wiring, and the first electrode and the second electrode interposed between the first insulating film and the second insulating film. A spacer having a switch opening at a matching position and a spacer having a wiring connection opening at a position where the first wiring integrated in the wiring connection and the connection wiring are aligned, and the first wiring is integrated; A second connector provided with a wiring connection portion and the connection wiring; Wherein interposed between the film first
An anisotropic conductive adhesive for electrically connecting a wiring to the connection wiring; and a tail portion on which the connection wiring and the second wiring are integrated and a connector is provided. And the connection wiring and the second wiring integrated in the tail portion are bonded via a conductive adhesive, and the bonding portion is reinforced by a sealing resin. It is characterized by.

In the present invention, the terminal of the connector, the connection wiring, and the second wiring are bonded via a conductive adhesive, and the bonding portion is reinforced by a sealing resin. Their connection strength can be improved. That is, the reliability of electrical conduction between the terminal of the connector and the wiring of the switch can be improved. In addition, since the connector is directly mounted on the tail portion using the conductive adhesive and the sealing resin, the connection substrate which has been conventionally required becomes unnecessary. Therefore, the thickness of the connector connection portion can be reduced.

Preferably, a reinforcing substrate is provided on the surface of the tail portion. Accordingly, the strength of the tail portion can be improved, so that breakage of the tail portion around the mounting portion of the connector can be prevented.

Further, it is preferable that a positioning pin is provided at a lower portion of the connector, and a positioning hole into which the positioning pin is fitted is provided in the tail portion and the reinforcing substrate. Thus, the connector can be positioned at a predetermined position of the tail portion by fitting the positioning pin into the positioning hole. This facilitates the work of mounting the connector on the tail.

Further, one of the connection wiring and the second wiring integrated in the tail portion is routed to the lower surface of the tail portion via a through hole penetrating the tail portion in the thickness direction. It is preferable that it is done. This allows
One of the connection wiring and the second wiring integrated in the tail portion can be routed on the upper surface of the tail portion and the other can be routed on the lower surface of the tail portion, so that the width of the tail portion can be reduced.

[0036]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a membrane switch according to an embodiment of the present invention will be specifically described with reference to the accompanying drawings. FIGS. 1A and 1B are cross-sectional views showing a tail portion of a membrane switch according to an embodiment of the present invention, wherein FIG. 1A is a cross-sectional view taken along the line BB ′ shown in FIG.
FIG. 2 is a front view and a side view showing the membrane switch after mounting the BB connector. Further, FIG.
3 is a view as seen in the direction of the arrow E shown in FIG. 2, and FIG. 3 (b) is a view as seen in the direction of arrow F shown in FIG. FIG. 4 is a front view and a side view showing the membrane switch before mounting the BB connector. Also,
FIG. 5A is a view as viewed from an arrow E shown in FIG. 4, and FIG. 5B is a view as viewed from an arrow F shown in FIG. FIG. 6 is a rear view showing the membrane switch after mounting the BB connector.
FIG. 7A is a sectional view taken along the line AA ′ shown in FIGS.
FIG. 7B is an enlarged view of a wiring connection portion. FIG. 8 is a cross-sectional view taken along the line CC ′ shown in FIGS. Further, FIG.
9A is a sectional view taken along the line DD ′ shown in FIGS. 2 and 4, and FIG.
(B) is an enlarged view of an electrode formation region. The configuration of the membrane switch according to the present embodiment will be described below.

As shown in FIGS. 1 to 3 and FIG. 9, a plurality of upper electrodes (first electrodes) made of Ag are provided at predetermined positions on the surface of an upper film (first insulating film) 5a made of polyethylene terephthalate (PET). The electrodes 7a and the upper wiring (first wiring) 9a connecting between the electrodes are formed by printing, thereby forming an upper electrode sheet. As shown in FIGS. 2 and 7, these upper wirings 9a are integrated in a wiring connection portion 13 provided on the upper film 5a, and a wiring connection portion 13 is provided around the wiring connection portion 13 in the upper film 5a. A slit 13a for partitioning 13 is selectively provided.

Similarly, as shown in FIGS. 1 to 3, 6, 7 and 9, a plurality of lower electrodes 7b made of Ag are provided at predetermined positions on the surface of the lower film (second insulating film) 5b made of PET. (Second electrode), lower wiring (second wiring) 9b connecting these electrodes, and upper wiring connecting wiring 9c connected to upper wiring 9a are formed by printing, whereby the lower electrode sheet is formed. Is configured. The lower wiring 9b and the upper wiring 9c are connected.
Are integrated on a tail portion 15a on which a connector to be connected to another substrate is mounted.

As shown in FIGS. 2, 3 and 7 to 9, the upper electrode sheet and the lower electrode sheet are arranged with the surfaces on which the upper electrode 7a and the lower electrode 7b are formed facing each other. A spacer 6 made of PET is interposed. The spacer 6 has a switch opening 6b and a wiring connection opening 6 at a position where the upper electrode 7a and the lower electrode 7b match and a position where the wiring connection 13 is formed.
a. Therefore, the upper electrode 7a and the lower electrode 7b come into contact with each other through the switch opening 6b provided in the spacer 6, and are integrated in the wiring connection portion 13 through the wiring connection opening 6a. Upper wiring 9a
And the upper wiring connection wiring 9c formed on the lower film 5b.

As shown in FIGS. 2, 6, and 8, these upper electrode sheets, spacers 6, and lower electrode sheets are strictly aligned by using a jig or the like, and then electrodes and wirings are formed. In a region where the fusion bonding horn (not shown) is used, a fusion bonding portion 11 for spacer bonding is formed by ultrasonic fusion using a fusion horn (not shown). The sheet, the lower electrode sheet, and the spacer 6 are joined. As shown in FIG. 7, the wiring connection portion 13 where the upper wiring 9a is formed and the region where the upper wiring connection wiring 9c is formed on the lower film 5b are anisotropically arranged between them. They are bonded by a conductive film (anisotropic conductive adhesive) 2. Thereby, the wiring connection part 13 is fixed to the lower film 5b. Thus, the upper wiring 9a
And the upper wiring connection wiring 9c are electrically connected via the anisotropic conductive film 2 to constitute the membrane switch 1.

Lower wiring 9b and upper wiring connecting wiring 9c
The configuration of the tail portion 15a provided with a connector for connecting to another substrate will be described below. As shown in FIGS. 1 to 6, in the tail portion 15a, a portion in which the lower film 5b is selectively partitioned is used as a base material. On the upper surface of the lower film 5b, an upper wiring connection wiring 9c is provided. Also,
An upper protective tape 5d made of PET is covered with an adhesive (not shown) to protect the upper wiring connection wiring 9c from mechanical damage. The upper wiring connection wiring 9c is connected to the upper wiring terminal 9g.

Further, a lower wiring 9b is formed on the base side of the upper surface of the tail portion 15a. The lower wiring 9b extends around the lower surface of the lower film 5b through a through hole 9f formed through the lower film 5b in the thickness direction. The lower wiring 9b wrapped around the lower surface of the lower film 5b has a wiring extending toward the tip of the tail portion 15a, and again passes through the through hole 9f formed at the tip of the tail portion 15a. Is wrapping around. The lower wiring 9b extending around the upper surface of the lower film 5b has a wiring extending toward the base of the tail portion 15a and is connected to the lower wiring terminal 9h. Note that a lower protective tape 5e made of PET is covered with an adhesive (not shown) to protect the lower wiring 9b formed on the lower surface of the lower film 5b from mechanical damage.

As shown in FIGS. 1, 4 and 5, the upper wiring terminal 9g connected to the upper wiring connection wiring 9c and the lower wiring 9
The lower wiring terminal 9h connected to the terminal b is formed.

The upper wiring terminal 9g of the tail portion 15a
In the area where the lower wiring terminals 9h are formed,
A female connector (hereinafter, BB female connector) 1 of a to-board connector is provided. The BB female connector 1 is provided with a connector concave portion 1a into which the convex portion of the male connector is fitted. A locking projection 1b is formed on the outer wall facing the tip of the tail portion. The locking projections 1b improve the connection strength between the BB female connector 1 and a BB male connector (not shown) that forms a pair.

A plurality of inter-connector terminals 1c are provided on a surface of the connector recess 1a facing the tip of the tail portion, and a plurality of inter-connector terminals 1d are provided on the opposite surface.

Further, a position matching with the upper wiring terminal 9g below the BB female connector 1 and the lower wiring terminal 9h
External terminals 1e are provided at positions matching with the external terminals.

Further, the inter-connector terminal 1c and the external terminal 1
e, the inter-connector terminal 1d and the external terminal 1e are electrically connected, and the external terminal 1e is electrically connected to the corresponding upper wiring terminal 9g or lower wiring terminal 9h via the conductive adhesive 21. Connected.

Further, a sealing resin material 3 is provided so as to cover the exposed portions of the external terminal 1e, the anisotropic conductive film 2, the upper connection wiring 9c and the lower wiring 9b. The connection strength between the B female connector 1 and the tail portion 15a is improved.

It should be noted that BB female connector 1 and B
-B male connector (not shown) is provided with a connector protrusion (not shown) that matches with the connector recess 1a.
When an inter-connector terminal (not shown) corresponding to c and 1d is provided, and a connector convex portion is fitted into the connector concave portion 1a to connect the BB female connector 1 and the BB male connector, Terminal 1c between connectors provided on them
1d and their corresponding inter-connector terminals are in contact with each other, so that the wiring of the membrane switch is electrically connected to the circuit of the board on which the BB male connector is mounted.

In the membrane switch of the present embodiment thus constructed, the connection between the tail portion 15a and the BB connector 1 is adhered by the conductive adhesive 21 and the sealing resin 3 is used. Because of the reinforcement, the connection strength between the terminal of the connector and the wiring of the switch can be improved. That is, the reliability of electrical conduction between the terminal of the connector and the wiring of the switch can be improved.

Further, since the BB female connector 1 is directly mounted on the tail portion 15, a connection substrate and an anisotropic conductive film for bonding the connection substrate and the tail portion, which are conventionally required, are unnecessary. become. Therefore, the thickness of the connector connection portion can be reduced. In addition, the step of connecting portion reinforcing tape and ultrasonic heat fusion, which have been used to improve the connection strength between the tail portion and the connection substrate, can be omitted. For this reason, these parts costs and operation costs can be reduced.

Further, conventionally, the mounting strength of the BB connector on the connection board is the extrusion strength (the components mounted on the board are measured at a speed of 60 mm / min from the surface of the board by a measuring device such as a push-pull gauge or a load cell). 8 (kgf) when the mounted component comes off the board when pressed
/ Connector), whereas the mounting strength of the BB female connector 1 of this embodiment to the tail portion 15 is 1 in pushing strength.
6 (kgf / piece) or more, and the mechanical strength can be increased. In addition, the failure mode at the time of measuring the strength by pushing out the membrane switch of the present embodiment is a tear of the PET which is the base material of the membrane switch, and has a sufficient fixing strength. For this reason, the reliability is high for the attachment / detachment work between the male connector and the female connector in inspection or the like.

In the present invention, a structure in which a reinforcing substrate made of, for example, glass epoxy is adhered to the tail portion and reinforced can be employed. With this configuration, PE
Since T is used as a base material, it is rigid and flexible, so that the strength of the tail portion having a small strength can be improved, so that breakage of the tail portion around the mounting portion of the BB female connector can be prevented. it can.

FIG. 10 is a sectional view showing a tail portion of a membrane switch according to another embodiment of the present invention. Further, as described above, when the tail portion is reinforced by the reinforcing substrate, for example, four positioning holes 43 penetrating the reinforcing substrate 42 and the tail portion are formed, and the positioning holes 43 are formed.
BB provided with four positioning pins 52 to be fitted with
A female connector 51 can be used. in this case,
By fitting the positioning pins 52 into the positioning holes 43, the BB female connector 51 can be positioned at a predetermined position on the tail portion. For this reason, the work of mounting the BB female connector on the tail portion becomes easy.

In this embodiment, a BB connector is used as a connector for connecting the membrane switch to another board (PC board), but the present invention is not limited to this. .

In the present embodiment, the anisotropic conductive film 2 is used. However, in the present invention, any conductive film can be used as long as conduction can be obtained only in the film thickness direction. Anisotropic conductive film (AC
In addition to F: Anisotropic Conductive Film, an anisotropic conductive paste (ACP) can be used.

Further, in this embodiment, in order to reduce the width of the tail portion, the lower wiring 9b is provided with a through hole 9f.
Through the lower portion of the tail portion 15a, but if it is not necessary to reduce the width of the tail portion, no through hole is formed and the lower wiring 9b is routed above the tail portion 15a. You may comprise.

[0058]

As described in detail above, according to the present invention,
Since the connection strength between the terminal of the connector, the connection wiring, and the second wiring can be improved, the reliability of electrical conduction between the terminal of the connector and the wiring of the switch can be improved. In addition, the need for a connection board, which has been conventionally required, is eliminated, so that the thickness of the connector connection portion can be reduced.

[Brief description of the drawings]

FIGS. 1A and 1B are cross-sectional views showing a tail portion of a membrane switch according to an embodiment of the present invention, wherein FIG.
-B 'sectional drawing, (b) is a front view.

FIG. 2 is a front view and a side view showing the membrane switch after mounting a BB connector.

3A is a view as seen from an arrow E shown in FIG. 2, and FIG. 3B is a view as seen from an arrow F shown in FIG.

FIG. 4 is a front view and a side view showing a membrane switch before mounting a BB connector.

5A is a view as seen from an arrow E shown in FIG. 4, and FIG. 5B is a view as seen from an arrow F shown in FIG.

FIG. 6 is a rear view showing the membrane switch after mounting the BB connector.

7A is a sectional view taken along the line AA ′ shown in FIGS. 2 and 4, and FIG. 7B is an enlarged view of a wiring connection portion.

FIG. 8 is a sectional view taken along the line C-C 'shown in FIGS. 2 and 4;

9A is a cross-sectional view taken along the line DD ′ shown in FIGS. 2 and 4, and FIG. 9B is an enlarged view of an electrode formation region.

FIG. 10 is a sectional view showing a tail portion of a membrane switch according to another embodiment of the present invention.

FIG. 11 is a schematic view showing a conventional first membrane switch.

FIG. 12 is a cross-sectional view showing a conventional first membrane switch.

FIG. 13 is a schematic diagram showing a tail portion of a second conventional membrane switch.

FIG. 14 is a schematic view showing a tail portion of a fourth conventional membrane switch.

[Explanation of symbols]

 1, 51, 101; BB female connector 1a, 101a; connector recess 1b; locking projection 1c, 1d, 101c, 101d; inter-connector terminal 1e, 101e; external terminal 2, 102; anisotropic conductive film 3 An upper film 5b, 105b; a lower film 5d, 105d; an upper protective tape 5e; a lower protective tape 6, 106; a spacer 6a; a wiring connection opening 6b, 106b; a switch opening 7a; 107a; upper electrode 7b, 107b; lower electrode 9a, 109a; upper wiring 9b, 109b; lower wiring 9c, 109c; upper wiring connecting wiring 9f; through hole 9g; upper wiring terminal 9h; Fusion parts 13, 113; wiring connection parts 13a, 113a; slits 15a, 115a, 1 15b, 115c; tail part 21; conductive adhesive 42; reinforcing substrate 43; positioning hole 52; positioning pin 108; support plate 116a, 116b, 116c; membrane switch 117; pressing plate 117a; rubber 118; PC body main board 119a; PC main body wiring 121; finger touch section 122; support tool 123; rubber cushion 123a; main body section 123b; leg section 123c; projection 124; base 124a; groove 132; key top section 141;

Claims (4)

[Claims] A first insulating film and a second insulating film disposed to face each other; a plurality of first electrodes provided on a surface of the first insulating film facing the second insulating film; A first wiring connected to the plurality of first electrodes, a wiring connection part on which the first wiring is integrated, a slit selectively provided around the wiring connection part in the first insulating film, A plurality of second electrodes provided on a surface of the second insulating film facing the first insulating film; a second wiring connected to the plurality of second electrodes; and a connection for connecting the first wiring. A wiring interposed between the first insulating film and the second insulating film and having a switch opening at a position where the first electrode and the second electrode are aligned with each other; Wiring at a position where one wiring matches the wiring for connection A spacer having a connection opening,
Anisotropic conduction interposed between a wiring connection portion on which the first wiring is integrated and a second insulating film provided with the connection wiring and electrically connecting the first wiring to the connection wiring. A terminal provided at a lower portion of the connector and a connection wiring integrated in the tail portion, the terminal having a conductive adhesive, the connection wiring and the second wiring integrated and a connector provided with a connector. And a second wiring, wherein the bonding portion is bonded via a conductive adhesive and the bonding portion is reinforced by a sealing resin. 2. The membrane switch according to claim 1, wherein a reinforcing substrate is provided on a surface of the tail portion. 3. The connector according to claim 2, wherein a positioning pin is provided at a lower portion of the connector, and a positioning hole in which the positioning pin is fitted is provided in the tail portion and the reinforcing substrate. Membrane switch described in. 4. One of the connection wiring and the second wiring integrated in the tail portion is routed to the lower surface of the tail portion via a through hole penetrating the tail portion in the thickness direction. The membrane switch according to any one of claims 1 to 3, wherein: