JPH11345533A - Membrane switch and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow easy manufacture at low cost and enhance the reliability of electrical continuity. SOLUTION: In a membrane switch 1, a plurality of electrodes and upper wiring 9a connecting the electrodes together are formed on the surface of an upper film 5a, the upper wiring 9a being deposited on wiring connections 13 provided on the upper film 5a. Similarly, a plurality of electrodes, lower wiring connecting the electrodes together, and upper-wiring-connecting wiring 9c for connection to the upper wiring 9a are formed on the surface of a lower film 5b. A spacer 6 is interposed between the upper film 5a and the lower film 5b and the upper wiring 9a and the upper-wiring-connecting wiring 9c are put into continuity to each other by an anisotropic conducting film 2 via an opening in the spacer 6. A single-sided adhesive tape 4 for preventing the stripping of the wiring connections 13 is bonded to an area from the top of the wiring connections 13 to the upper surface of the lower film 5b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a membrane switch incorporated in a keyboard or the like of a personal computer and a method of manufacturing the same, and more particularly, to a membrane switch which can be easily manufactured at low cost and improves electrical conduction reliability. And a method for manufacturing the same.

[0002]

2. Description of the Related Art FIG. 5 is a schematic view showing a part of a keyboard used as an input device of a conventional personal computer. 6A is a perspective view showing a key top portion of a keyboard, FIG. 6B is a perspective view showing a membrane switch, and FIG. 6C is a perspective view showing a support plate. FIG. 7 is a plan view showing a lower electrode sheet of the membrane switch shown in FIG. 6B.

As shown in FIGS. 5, 6 (b) and 6 (c), a support plate 28 made of a metal plate such as Fe and Al is used.
A membrane switch 31 is disposed on the top. FIG.
As shown in FIG. 7, a plurality of electrodes 27a made of Ag and an upper wiring (not shown) connecting the electrodes 27a are provided at predetermined positions on the surface of the upper film 25a made of polyethylene terephthalate (PET). The upper electrode sheet is formed by printing. These upper wirings are integrated in a wiring connection portion provided in the upper film 25a, and the upper film 25a is provided with a U-shaped slit for dividing the wiring connection portion.

Similarly, a lower film 25 made of PET is used.
a plurality of electrodes 27b made of Ag and a lower wiring 2 connecting these electrodes 27b at predetermined positions on the surface of
9b and upper wiring connection wiring 29c connected to the wiring formed on the upper film 25a are formed by printing to form an upper electrode sheet. The lower wiring 29b and the upper wiring connecting wiring 29c are integrated in the tail part 31a of the membrane switch 31. The upper electrode sheet and the lower electrode sheet are arranged with the surfaces on which the electrodes 27a and 27b are formed facing each other, and a spacer 26 made of PET having an opening at a position matching the electrodes is overlapped between the two. ing.

[0005] These upper electrode sheets, spacers and lower electrode sheets are strictly aligned using a jig or the like, and then are ultrasonically fused in a region where no electrodes, wirings, etc. are formed. It is adhered by forming the attachment portion 31b. The fused portion 31b is usually formed at two places, and has a circular shape of about 2.0 to 3.5 mm.

On the upper film 25a, a plastic base 24 constituting the key top portion 32 is disposed. The base 24 includes a portion where a key is formed,
That is, an opening is provided at a position matching the electrodes 27a and 27b when the key top portion 32 is arranged on the membrane switch 31, and a rubber cushion 23 is provided in the opening. The rubber cushion 23 includes a main body 23 having a projection 23c for pressing the switch.
a and a leg 23b supporting the main body 23a, whereby the main body 23a is supported in a state of being separated from the upper surface of the upper film 25a.

Further, above the rubber cushion 23,
A plastic finger contact part 21 supported by a support 22 is arranged. The support tool 22 supports the finger touch section 21 in a state where two rod-shaped members locked to each other at the center cross each other. The end of the support tool 22 is locked so as to slide on the back surface side of the finger touch portion 21 and the upper surface side of the base 24.
Is supported by the main body 23a of the rubber cushion 23,
Being lifted. As described above, the key top portion 32 is configured by the base 24, the rubber cushion 23, the support 22, and the finger contact portion 21.

Here, the method of assembling the keyboard shown in FIGS. 5 and 6 will be described in detail below. FIG. 8 (a)
FIG. 8B is a sectional view showing a method of assembling the keyboard in the order of steps. However, FIGS. 8A and 8B show the upper wiring connection wiring 2 of the lower electrode sheet shown in the part A of FIG.
9c shows a method of connecting the wiring of the upper electrode sheet with the wiring 9c. Before assembling the keyboard, the upper wiring 29a integrated in the wiring connection part 33 of the upper electrode sheet and the upper wiring connection wiring 29c formed on the lower film 25b are not connected. Then, by assembling the keyboard, the wiring connection part 33 is pressed downward, and the upper wiring 29a and the upper wiring connecting wiring 29c are connected.

That is, as shown in FIG. 8A, a groove 24a which is concave upward is formed on the rear surface side of the base 24 of the key top portion 32 at a position matching the wiring connection portion 33. . Therefore, in the keyboard assembling process, first, the rubber press-contact tube 34 is inserted into the groove 24a, and then the base 24 is brought into contact with the upper surface of the upper film 25a.

At this time, as shown in FIG. 8B, since the upper film 25a is provided with the slit 33a so as to surround the wiring connection portion 33, the wiring connection portion 33 is pressed by the pressure tube 34. Distorted downward, upper wiring 29
a is pressed against the upper wiring connection wiring 29c of the lower electrode sheet. As a result, the upper wiring 29a and the upper wiring connecting wiring 29c are electrically connected, and current can flow to the electrode 27a of the upper electrode sheet via the upper wiring connecting wiring 29c. Circuit is completed.

In the keyboard constructed as described above, when a finger presses the finger touching portion 21 at a predetermined position, the rod-like members constituting the support 22 overlap linearly, and at the same time, the legs of the rubber cushion 23 The portion 23b is bent, and the main body 23a is pressed downward. Then, the protrusion 23c of the rubber cushion 23 presses the switch portion of the membrane switch 31, and the electrode 27a and the electrode 27b come into contact. As a result, a current flows between the wiring formed on the upper film 25a and the wiring 29b formed on the lower film 25b, and this information is transmitted to hardware (not shown) of the personal computer. Thereafter, when the finger touch portion 21 is released, the leg portion 23 b of the rubber cushion 23 is opened.
Returns to its original shape, the finger touching portion 21 is lifted, and the electrode 27a and the electrode 27b are separated.

Incidentally, even when the membrane switch 31 is incorporated in a housing other than the keyboard, the base 2
4 is provided in the housing, and the upper wiring 29a and the upper wiring connecting wiring are formed by the press-connecting tube in the same manner as shown in FIGS. 8A and 8B. 29c.

By the way, besides the membrane switch 31 assembled by bringing the upper wiring 29a and the upper wiring connecting wiring 29c into conduction by pressure contact, there is a membrane switch having a bent structure. The membrane switch having the bent structure is configured such that after the outer film is cut out by a mold in a state where the upper film and the lower film are connected at a predetermined side (bent portion), the upper film and the lower film are bent around the bent portion. It is manufactured by bonding both with a spacer between them. Therefore, since the upper wiring formed on the upper film is connected to the wiring on the lower film through the bent portion in advance, the upper wiring shown in FIG.
Similarly to the membrane switch 31 shown in FIG. 8A and FIG. 8B, a membrane switch having one tail can be obtained.

[0014]

However, the above-mentioned membrane switch 31 has the following problems. That is, as shown in FIG. 8 (a), in order to connect the upper wiring 29a and the upper wiring connecting wiring 29c, the press-connecting tube 34 is attached to the housing (the base 24 of the key top portion 32).
A groove 24a for sandwiching the groove is required. Therefore, groove 2
The thickness of the housing is increased by the depth h _R of 4a.

Further, since the press-connecting tube 34 is made of rubber, the raw material cost is high, and the cost for assembling the press-connecting tube 34 into the housing is high, so that the manufacturing cost of the entire membrane switch is reduced. There is also the problem of rising.

Further, there is a case where the casing is assembled by forgetting to incorporate the press-connecting tube 34. Then, the upper wiring 29a and the upper wiring connecting wiring 29c cannot be conducted, and the circuit of the membrane switch becomes an open circuit, so that the switching function cannot be obtained. Furthermore, even if the forgetting of the press-fitting tube 34 does not occur, the upper wiring 29a may not be formed due to a poor design of the tube 34 or a poor molding of the housing.
In some cases, the connection resistance of the contact portion between the wiring and the upper wiring connection wiring 29c may be increased, or the conduction between the two may be poor.

Further, in the membrane switch having the folded structure, since the upper film and the lower film are cut out from one PET film in a connected state, the number of the upper film and the lower film that can be obtained from one film ( (Imposition efficiency) is low.
Furthermore, when cutting from a PET film in a state where the upper film and the lower film are connected, a large special mold is required as compared with the case where the upper film and the lower film are cut separately, so that the manufacturing cost is reduced. There is also a problem that it becomes extremely high.

The present invention has been made in view of the above problems, and provides a membrane switch which can be easily manufactured at low cost and can improve the reliability of electrical conduction, and a method of manufacturing the same. The purpose is to provide.

[0019]

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 having a wiring connection opening at a position where the first wiring integrated with the wiring connection and the connection wiring are aligned; And a wiring connection part on which the first wiring is integrated, An anisotropic conductive adhesive that press-fits a second insulating film provided with a connection wiring to electrically connect the first wiring and the connection wiring, and the first wiring of the wiring connection portion is And a pressure-sensitive adhesive tape affixed to a region of the second insulating film straddling the surface on which the connection wiring is formed from a surface on which the connection wiring is not formed.

Another membrane switch according to the present invention comprises:
In place of the adhesive tape, a reinforcing plate is attached to a region matching one or both of the first insulating film and the second insulating film with the wiring connection portion to reinforce the wiring connection portion. And In this case,
An adhesive tape may be attached to a region of the wiring connection portion that extends from a surface on which the first wiring is not formed to a surface of the second insulating film on a surface on which the connection wiring is formed.

It is preferable that a double-sided pressure-sensitive adhesive tape is provided between the wiring connection portion and the second insulating film via the wiring connection opening and adheres the two.

According to a method of manufacturing a membrane switch according to the present invention, a plurality of first electrodes and a first wiring connected to the plurality of first electrodes are provided on one surface, and the first wiring is integrated. A first insulating film having a connection part, a slit selectively provided around the wiring connection part, a plurality of second electrodes on one surface, and a second wiring connected to the plurality of second electrodes; A second insulating film provided with a connection wiring to which the first wiring is connected, wherein the first electrode and the second electrode are arranged so as to face each other, and the first insulating film and the second A switch opening is provided at a position where the first electrode and the second electrode are aligned with an insulating film, and a wiring is provided at a position where the first wiring integrated with the wiring connection and the connection wiring are aligned. Interposing a spacer having a connection opening, and In the method for manufacturing a membrane switch and a step of bonding the said spacer and the first insulating film and said second insulating film, before the step of interposing the spacers, the integrated in the wiring connection portion 1
After the step of arranging an anisotropic conductive adhesive that electrically connects the wiring and the connection wiring, and the step of bonding the first insulating film and the second insulating film and the spacer, A first connecting portion on which the first wiring is integrated and a second insulating film on which the connecting wiring is formed are pressure-bonded with the anisotropic conductive adhesive through the first connecting portion through the first opening; A step of electrically connecting a wiring to the connection wiring, and a region extending from a surface of the wiring connection portion where the first wiring is not formed to a surface of the second insulating film on which the connection wiring is formed. And a step of attaching an adhesive tape to the adhesive.

According to another method for manufacturing a membrane switch according to the present invention, instead of the step of attaching the adhesive tape,
The method further includes a step of attaching a reinforcing plate for reinforcing the wiring connection portion to a region matching one or both of the first insulating film and the second insulating film with the wiring connection portion.

In the present invention, the first wiring and the connection wiring are connected by an anisotropic conductive adhesive, and the second insulating film is formed from the surface of the wiring connection portion where the first wiring is not formed. An adhesive tape is stuck to a region over the connection wiring forming surface, or the wiring connection portion is reinforced in a region matching one or both of the first and second insulating films and the wiring connection portion. Since the reinforcing plate to be bonded is attached, the manufacturing cost can be reduced as compared with the case where the first wiring and the connection wiring are connected by pressing the insulating film with a pressure welding tube or the like, and the wiring can be reduced. The connection portion does not peel off from the second insulating film, and the reliability of electrical conduction between the two can be improved. Also, when this membrane switch is incorporated in a housing such as a keyboard, it is not necessary to form a groove or the like for sandwiching the pressure welding tube in the housing, so the housing is thinned by the depth of this groove. can do.

Further, in the present invention, since the switch circuit is completed before the membrane switch is incorporated in the housing, the electrical test as a switch can be performed in a state of the single membrane switch. Therefore,
A defect can be found at an early stage, and a processing step when a defect occurs can be simplified.

[0026]

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. FIG. 1 is an enlarged plan view showing a part of a membrane switch according to a first embodiment of the present invention.
FIG. 2 is a sectional view taken along line BB in FIG. As shown in FIGS. 1 and 2, a support plate 8 made of a metal plate such as Fe and Al is used.
The membrane switch 1 is arranged on the above. The configuration of the membrane switch 1 will be described below.

At predetermined positions on the surface of an upper film (first insulating film) 5a made of polyethylene terephthalate (PET), a plurality of electrodes (first
Electrodes: not shown) and upper wirings (first wirings) 9a for connecting the electrodes are formed by printing, thereby forming an upper electrode sheet. Note that these upper wirings 9a are integrated in a wiring connection portion 13 provided in the upper film 5a, and a slit 13a for partitioning the wiring connection portion 13 is selectively formed around the wiring connection portion 13 in the upper film 5a. It is provided in.

Similarly, A is placed at a predetermined position on the surface of the lower film (second insulating film) 5b made of PET.
g (second electrode: not shown), lower wiring connecting these electrodes (second wiring: not shown),
Wiring 9c connected to the upper wiring 9a and the upper wiring 9a
Are formed by printing, thereby constituting a lower electrode sheet. The lower wiring and the upper wiring 9c are integrated in a tail portion (not shown) for connecting a connector or the like to the membrane switch 1.
The upper electrode sheet and the lower electrode sheet are disposed with the surfaces on which the electrodes are formed facing each other, and the switch opening is provided between the two at positions corresponding to the electrodes and at positions where the wiring connection portions 13 are formed. (Not shown) and a spacer 6 made of PET and having a wiring connection opening 6a. Therefore, the upper wiring 9a integrated in the wiring connection part 13 is formed by the opening 6a provided in the spacer 6.
And the upper wiring connection wiring 9c formed on the lower film 5b.

After the upper electrode sheet, the spacer 6 and the lower electrode sheet are strictly aligned by using a jig or the like, they are ultrasonically fused in a region where no electrodes, wirings, etc. are formed. It is adhered by. In addition, 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 an anisotropically conductive film (anisotropically conductive film) disposed therebetween. (Adhesive adhesive 2). Furthermore,
In the region where the opening 6a of the spacer 6 is provided, between the upper film 5a and the region where the upper wiring connection wiring 9c of the lower film 5b is not formed, the sheet 3a is provided.
A double-sided pressure-sensitive adhesive tape 3 on which a pressure-sensitive adhesive 3b is applied is disposed on both sides, whereby both are adhered. Further, an adhesive 4b is applied to one surface of the sheet 4a so as to cover the wiring connection portion 13 from a region above the wiring connection portion 13 to a region extending to an upper surface of the lower film 5b exposed by the slit 13a of the upper film 5a. Single-sided adhesive tape 4
Is affixed. In this way, the upper wiring 9a and the upper wiring connecting wiring 9c are electrically connected via the anisotropic conductive film 2, and the membrane switch 1 is configured.

In this embodiment, the wiring connection 1
The anisotropic conductive film 2 is arranged between the lower electrode sheet 3 and the lower electrode sheet. In the present invention, any conductive material can be used as long as it can provide conduction only in the film thickness direction. In addition to the anisotropic conductive film, an anisotropic conductive paste or the like can be used.

Next, a method for manufacturing the membrane switch 1 will be described. First, a polyethylene terephthalate (PET) sheet constituting the upper film 5a, the lower film 5b, the spacer 6, and the like, the double-sided adhesive tape 3, the single-sided adhesive tape 4, the anisotropic conductive film 2, and the like are prepared. Next, on the surface of the region to be the upper film 5a of the PET sheet, an upper electrode and upper wiring made of Ag are formed by printing, and on the surface of the region to be the lower film 5b,
The lower electrode, the lower wiring, and the upper wiring connecting wiring made of Ag are formed by printing. Next, the PET sheet is cut into the shape of the upper film 5a, the lower film 5b, and the spacer 6, and the wiring connection portion 1 of the upper film 5a is cut.
A slit 13a is provided at a position surrounding the area to be 3, and
A switch opening and a wiring connection opening 6a are provided at predetermined positions of the spacer. Thereby, an upper electrode sheet, a lower electrode sheet, and a spacer that constitute the membrane switch are obtained.

After that, the anisotropic conductive film 2 is temporarily pressure-bonded to the region where the upper wiring connection wiring 9c is formed on the lower film 5b by a heat laminating process, hand ironing or the like. Thereafter, a double-sided adhesive tape 3 for adhering the upper film and the lower film is attached near the region where the anisotropic conductive film 2 has been temporarily compressed on the lower film 5b.

Thereafter, the separator and release paper which protected the surfaces of the anisotropic conductive film 2 and the double-sided adhesive tape 3 are peeled off. Thereafter, the lower electrode sheet and the upper electrode sheet are arranged with the surfaces on which the electrodes and the like are formed facing each other, a spacer is arranged between the two, and they are stacked using an assembly jig or the like. Thereafter, the upper electrode sheet, the spacer, and the lower electrode sheet are bonded by ultrasonic fusion. Thereafter, the wiring connection portion 13 of the upper electrode sheet and the region where the upper wiring connection wiring 9c of the lower electrode sheet is formed are fully press-bonded with the anisotropic conductive film 2, and the upper electrode sheet and the upper electrode sheet are positioned in the vicinity thereof. The lower electrode sheet is adhered with a double-sided adhesive tape 3.

Thereafter, a single-sided adhesive tape 4 is applied so as to cover the wiring connection portion 13 from the upper portion of the wiring connection portion 13 to a region extending to the upper surface of the lower film 5b exposed by the slit 13a of the upper film 5a. After that, a completion inspection such as an electrical inspection and an appearance inspection is performed on the obtained membrane switch.

In the membrane switch according to the first embodiment configured as described above, FIGS.
Similarly to the conventional membrane switch shown in FIG. 2B, the upper wiring 9a is connected to the upper wiring connecting wiring 9c of the lower electrode sheet and the upper wiring 9a is handled on the lower film 5b. It is possible to freely design the printed shape of the wiring 5b and the like. Further, in the first embodiment, since the upper film and the lower film can be separately cut out from one PET film, the imposition efficiency is improved as compared with the case where a membrane switch having a folded structure is manufactured. And the cost of the mold can be significantly reduced.

Further, in this embodiment, a membrane switch having a single tail can be obtained without forming a membrane switch having a bent structure, so that a circuit break (disconnection) in the bent portion occurs. Can be prevented, and the membrane switch can be easily connected to a power supply or other wiring.

In the membrane switch according to the first embodiment, the upper wiring 9a and the upper wiring
and c are connected by thermocompression bonding of the anisotropic conductive film 2, so that the upper wiring and the upper wiring connection wiring are connected by pressing the upper electrode sheet with a pressure welding tube or the like. Thus, the manufacturing cost can be reduced, and the reliability of electrical conduction between the two can be improved. Further, when this membrane switch is incorporated in a housing such as a keyboard of a personal computer, it is not necessary to form a groove or the like for sandwiching the press-contact tube in the housing. Can be reduced in thickness.

Further, in this embodiment, since the switch circuit is completed before the membrane switch is incorporated into the housing, the electrical test as a switch can be performed in a state of the membrane switch alone. Therefore, a defect can be found at an early stage, and a processing step when a defect occurs can be simplified.

However, in this embodiment, the anisotropic conductive film 2 interposed between the wiring connection portion 13 and the lower electrode sheet is for conducting between the wirings, and is provided for the wiring connection portion of the upper electrode sheet. 13 and the region on the lower film 5b where the upper wiring connection wiring 9c is formed is not completely bonded. Therefore, in the present embodiment, a region extending from above the wiring connection portion 13 to the upper surface of the lower film 5b is provided.
The upper film 5a and the lower film 5b are provided in a region where the single-sided adhesive tape 4 is stuck so as to cover the wiring connection portion 13 and the opening 6a of the spacer 6 is provided.
Are adhered by a double-sided adhesive tape 3. Therefore, with these single-sided adhesive tape 4 and double-sided adhesive tape 3,
It is possible to prevent the wiring connection portion 13 of the upper electrode sheet from peeling off from the lower electrode sheet.

In particular, the single-sided adhesive tape 4 is used to
3 has an effect of preventing the end face of the wiring connection portion 13 from being a trigger for peeling off from the lower electrode sheet. Also, when handling the membrane switch,
When a bending stress is applied to the vicinity of the wiring connection portion 13, the double-sided adhesive tape 3 has an effect of preventing the wiring connection portion 13 from peeling off and floating from the lower electrode sheet.
That is, the double-sided adhesive tape 3 can improve the peeling resistance in a region where the single-sided adhesive tape 4 alone cannot completely adhere.

FIG. 3 is a schematic view showing a membrane switch according to a second embodiment of the present invention, and FIG. 4 is a sectional view showing a part thereof. The only difference between the second embodiment shown in FIGS. 3 and 4 and the first embodiment shown in FIGS. 1 and 2 is that a reinforcing material is attached to the back surface of the lower electrode sheet. . Therefore, in FIGS. 3 and 4, FIGS.
Are denoted by the same reference numerals, and detailed description thereof will be omitted.

The second embodiment is similar to the first embodiment,
In a region where the single-sided adhesive tape 4 is attached so as to cover the wiring connection portion 13 and a region where the opening portion 6a of the spacer 6 is provided, a region from the upper portion of the wiring connection portion 13 to the upper surface of the lower film 5b is provided. The upper film 5a and the lower film 5b are adhered with the double-sided adhesive tape 3. Further, in the present embodiment, for example, PET is provided on the back side of the region where the wiring connection portion of the membrane switch 1 is formed.
A reinforcement member 7 made of is attached.

In the second embodiment configured as described above, the same effect as in the first embodiment can be obtained.
However, usually, the membrane switch is handled as a single membrane switch until it is incorporated into a key top portion and a support plate serving as a housing. Therefore, the operator grasps the areas 10a and 10b shown in FIG.
Is lifted, the flexible membrane switch 1
Has a shape bent between the region 10a and the region 10b.
Then, when bending stress is given by bending of the membrane switch 1 and the wiring connection portion 13 is formed in a region where the radius of curvature is reduced, the wiring connection portion 13 is peeled off from the lower electrode sheet by the bending stress. It will be easier.

Therefore, in the second embodiment, the reinforcing member 7 is attached to the rear surface side of the area where the wiring connection portion 13 of the membrane switch 1 is formed.
The wiring connection portion 13 is prevented from bending. Therefore, even when the membrane switch 1 is lifted alone, the mechanical strength of the region where the wiring connection portion 13 is formed can be improved by the reinforcing member 7, and a bending stress is applied to the wiring connection portion 13. Therefore, the wiring connection portion 13 does not peel from the lower electrode sheet.

In this embodiment, the upper wiring 9a
The double-sided adhesive tape 3 and the single-sided adhesive tape 4 and the reinforcing material 7 are used to improve the peeling resistance between the wiring 9c and the upper wiring 9c. Even so, the effect of improving the peeling resistance can be obtained. The material of the reinforcing member 7 is not particularly limited as long as it has a hardness that can obtain an effect of preventing the region where the wiring connection portion 13 is formed from being bent. A PET plate or a metal plate can be used. Further, the reinforcing member 7 may be attached to the upper surface of the upper film 5a.

[0046]

As described in detail above, according to the present invention,
Since the first wiring and the connection wiring are connected by an anisotropic conductive adhesive, and the wiring connection is protected by an adhesive tape or reinforced by a reinforcing plate, the wiring connection is formed by the second insulating film. Without peeling off from both, it is possible to improve the reliability of electrical conduction between the two,
The housing in which such a membrane switch is incorporated can be reduced in thickness.

[Brief description of the drawings]

FIG. 1 is an enlarged plan view showing a part of a membrane switch according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line BB of FIG.

FIG. 3 is a schematic view showing a membrane switch according to a second embodiment of the present invention.

FIG. 4 is a sectional view showing a part of a membrane switch according to a second embodiment of the present invention.

FIG. 5 is a schematic view showing a part of a keyboard used as an input device of a conventional personal computer.

FIG. 6A is a perspective view showing a key top portion of a keyboard, FIG. 6B is a perspective view showing a membrane switch,
(C) is a perspective view showing a support plate.

FIG. 7 is a plan view showing a lower electrode sheet of the membrane switch shown in FIG. 6 (b).

8A and 8B are cross-sectional views illustrating a method of assembling a keyboard in the order of steps.

[Description of Signs] 1, 31; membrane switch 2; anisotropic conductive film 3; double-sided adhesive tape 4; single-sided adhesive tape 5a, 25a; upper film 5b, 25b; lower film 6, 26; spacer 6a; Reinforcements 8, 28; support plates 9a, 29a; upper wirings 9c, 29c; upper wiring connecting wirings 13, 33; wiring connecting parts 13a; slits 21; finger touching parts 22; 24a; groove 27a, 27b; electrode 29b; lower wiring 31a; tail part 31b; fused part 32;

Claims (8)

[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. Adhesive adhesive, and an adhesive tape stuck on a region of the wiring connection portion that extends from a surface on which the first wiring is not formed to a surface of the second insulating film on a surface on which the connection wiring is formed,
A membrane switch comprising: A first insulating film and a second insulating film disposed opposite to 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. And a reinforcing plate affixed to a region matching one or both of the first insulating film and the second insulating film with the wiring connection portion, and reinforcing the wiring connection portion. Membrane switch. 3. An adhesive tape attached to a region of the wiring connection portion extending from a surface on which the first wiring is not formed to a surface of the second insulating film on a surface on which the connection wiring is formed. The membrane switch according to claim 2, wherein 4. A double-sided pressure-sensitive adhesive tape which is disposed between said wiring connection portion and said second insulating film via said wiring connection opening and adheres them to each other. The membrane switch according to any one of the preceding claims. 5. A plurality of first electrodes, and a first wiring connected to the plurality of first electrodes are provided on one surface, and a wiring connection part on which the first wirings are integrated, and a wiring connection part of the wiring connection part. A first insulating film having a slit selectively provided therearound; a plurality of second electrodes on one surface; a second wiring connected to the plurality of second electrodes; and the first wiring connected to the first wiring. A second insulating film provided with connection wiring;
An electrode and the second electrode are arranged to face each other, and a switch opening is provided between the first insulating film and the second insulating film at a position where the first electrode and the second electrode match. Interposing a spacer having a wiring connection opening at a position where the first wiring integrated in the wiring connection portion and the connection wiring are aligned; and providing the first insulating film, the second insulating film, Bonding the spacer and a spacer, before the step of interposing the spacer, electrically connecting both of the first wiring and the connection wiring integrated in the wiring connection part to each other. After the step of arranging the anisotropic conductive adhesive to be electrically conductive, and the step of bonding the first insulating film and the second insulating film to the spacer, 1 wiring A step of crimping the integrated wiring connection portion and the second insulating film on which the connection wiring is formed to electrically connect the first wiring and the connection wiring; 1. A method of manufacturing a membrane switch, comprising: a step of attaching an adhesive tape to a region extending from a surface on which no wiring is formed to a surface of the second insulating film on which the connection wiring is formed. 6. A plurality of first electrodes and a first wiring connected to the plurality of first electrodes are provided on one surface, and a wiring connection part on which the first wirings are integrated and a wiring connection part of the wiring connection part. A first insulating film having a slit selectively provided therearound; a plurality of second electrodes on one surface; a second wiring connected to the plurality of second electrodes; and the first wiring connected to the first wiring. A second insulating film provided with connection wiring;
An electrode and the second electrode are arranged to face each other, and a switch opening is provided between the first insulating film and the second insulating film at a position where the first electrode and the second electrode match. Interposing a spacer having a wiring connection opening at a position where the first wiring integrated in the wiring connection portion and the connection wiring are aligned; and providing the first insulating film, the second insulating film, Bonding the spacer and a spacer, before the step of interposing the spacer, electrically connecting both of the first wiring and the connection wiring integrated in the wiring connection part to each other. After the step of arranging the anisotropic conductive adhesive to be electrically conductive, and the step of bonding the first insulating film and the second insulating film to the spacer, 1 wiring A step of crimping an integrated wiring connection portion and a second insulating film on which the connection wiring is formed to electrically connect the first wiring and the connection wiring; and Affixing a reinforcing plate that reinforces the wiring connection portion to a region matching one or both of the wiring connection portions of the second insulating film,
A method for manufacturing a membrane switch, comprising: 7. After the step of electrically connecting the first wiring and the connection wiring, the first connection of the wiring connection portion is performed.
7. The membrane switch according to claim 6, further comprising a step of attaching an adhesive tape to a region of the second insulating film extending from the surface on which the wiring is not formed to the surface on which the connection wiring is formed. Method. 8. After the step of interposing the spacer, the wiring connection portion and the second connection portion are connected through the wiring connection opening.
The method for manufacturing a membrane switch according to any one of claims 5 to 7, further comprising a step of bonding the insulating film with a double-sided adhesive tape.