JP2001035301A - Switching element and switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain satisfactory click sensation in a reversing motion of a reversing plate and to prevent dust inversion onto a place for disposing the reversing plate by securing airflow around a periphery of the reversing plate in a switching element or a switch provided with the reversing plate. SOLUTION: Circular arc-shaped slits 50 positioned on the outer sides of a peripheral contour of a reversing plate are disposed at equivalent angle on a cover film 20 on which a reversing plate 30 in stuck. The slits 50 is opened, when the reversing plate 30 is subjected to reversing motion in a recessed shape made to follow the cover film 20, and the slits 50 is closed while the reversing plate 30 is in a no-load condition. In a place where air coming and going are necessary for the reversing motion of the reversing plate 30 (the periphery of the reversing plate: the outer side position of the peripheral contour of the reversing plate), air goes in and out when air coming and going is necessitated, and dust inversion is prevented at times other than the reversing motion. At the reversing motion of the reversing plate 30, a situation that hinders the reversing motion will not be generated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch element and a switch, and more particularly to a switch element having a circular dome-shaped reversal plate made of a conductor and a switch using the switch element.

[0002]

2. Description of the Related Art This type of switch element or switch has been proposed in Japanese Utility Model Publication No. 7-55779 and Japanese Utility Model Publication No. 5-26663.

In Japanese Unexamined Utility Model Publication No. 7-55779, as shown in FIG. 7, a circular dome-shaped inverted shape called a tact metal plate is provided on the back side of a cover film 1 called an insulating cover member. The board 2 is stuck. The cover film 1 is formed with two symmetrical slits 3 and 3 which are always open. In this switch element, each slit 3 formed in the cover film 1
Extends from the overlapping portion of the cover film 1 with the reversing plate 2 to the outside of the outer contour line 2a of the reversing plate 2.

According to Japanese Utility Model Publication No. 7-55779, this switch element is used because the slit 3 serves as an air flow port when the reversing plate 2 is pushed in and performs a reversing operation with the cover film 1 in a concave shape. It is described that the operability of is improved. Further, as compared with the case where the reversing plate 2 is attached to the back side of the cover film 1 having no slit 3, the degree of freedom of the cover film 1 is increased at the portion sandwiched between both slits 3 and 3, so that the reversing plate is It is described that the cover film 1 easily follows the reversal operation 2 (first conventional example).

On the other hand, in Japanese Unexamined Utility Model Publication No. Hei 5-26663, as shown in FIG. 6, a substantially circular opening 4 formed in an intermediate sheet 8 called an insulating sheet is called a movable contact. The reversing plate 5 is accommodated, and a cover film 6 called a protective sheet that covers the reversing plate 5 is attached to the intermediate sheet 8 in an overlapping manner. In addition, a linear cut 7 called a slit is formed at a position where the cover film 5 overlaps with the intermediate sheet 8.

According to Japanese Utility Model Publication No. Hei 5-26663, when the reversing plate 5 is pressed to perform a reversing operation, the tension generated by the cover film 6 following the reversing plate 5 and being deformed into a concave shape is generated. Since the notch 7 is weakened by being deformed as shown by the alternate long and short dash line, there is almost no pressing resistance. Therefore, it is described that a clear click feeling is obtained with the reversing operation of the reversing plate 5. In addition, it is described that the cut 7 also functions as an air circulation port. Furthermore, since the cut 7 is formed in the overlapping portion of the cover film 6 with the intermediate sheet, there is a description that dust hardly enters the location where the reversing plate 5 is provided (second conventional example).

[0007]

However, in the first conventional example, the slit 3 formed in the cover film 1 is formed.
Are always open, and since the slit 3 that is always open extends from the overlapping portion of the cover film 1 with the reversing plate 2 to the outside of the outer contour line 2a of the reversing plate 2, Dust easily enters from the slit 3 to the location where the reversing plate 2 is provided, and there is a great possibility that the operational reliability and contact stability of the reversing plate 2 are impaired by the entered dust.

Further, the two slits 3, 3 formed in the cover film 1 are provided with the reversing plate 2 as shown in FIG.
Is required to be symmetrical with respect to the center of the plate, that is, it is required to be located at the reference position. However, when the reversing operation of the reversing plate 2 is repeated, one or both of the two slits 3 and 3 are torn. There is a possibility that the cover film 1 is displaced from the reference position to one of the slits 3 side. If such a displacement occurs, when the reversing plate 2 is pushed in, the biasing force of the cover film 1 causes the direction of the pushing force. May change delicately to reduce operability.

Further, when the entire swelling surface of the reversing plate 2 is adhered to the cover film 1 at a portion other than the portion where the slit 3 is formed, the displacement of the outer peripheral portion of the reversing plate 2 is different from that of the cover film 1. Since it is restrained by sticking, it is difficult to obtain a good click feeling when the reversing plate 2 is reversed.

On the other hand, in the second conventional example, since the cut 7 formed in the cover film 1 is located at the overlapping portion with the intermediate sheet 8, even if the reversing plate 5 is turned in a concave shape, A situation may arise in which the cover film 1 contacts the edge of the opening 4 of the intermediate sheet 8 and the cut 7 does not communicate with the space inside the opening 4. When this situation occurs, even if the cut 7 is opened, the cut 7 does not work as an air flow port, so that a good click feeling due to the reversing operation of the reversing plate 5 cannot be obtained, and the operability is reduced.

The present invention has been made in view of the above circumstances, and the air around the reversing plate at the time of the reversing operation which is necessary to obtain a good click feeling when the reversing plate performs the reversing operation. While being able to ensure good distribution, it prevents dust from entering the location where the reversing plate is installed,
It is an object of the present invention to provide a switch element and a switch that can ensure good operation reliability and contact stability of a reversing plate.

Another object of the present invention is to provide a switch element and a switch capable of maintaining good operability for a long period of time by preventing the displacement of the cover film to which the reversing plate is adhered. Aim.

Still another object of the present invention is to provide a switch element and a switch in which the displacement of the outer peripheral portion of the reversing plate when the reversing plate performs a reversing operation is hardly restricted.

[0014]

The switch element and switch of the present invention will be described with reference to the drawings. The use of reference numerals in the figures in this section is for the purpose of helping to understand the contents of the invention, and is not intended to limit the contents to the examples in the drawings.

The switch element S1 according to the present invention has a cover film 20, and a circular dome-shaped reversing plate 30 made of a conductor adhered to the cover film 20. The reversing plate is kept in a circular dome shape by its own elasticity in a no-load state. A metal snap plate is used, which has a property of returning to the original circular dome shape, and desirably provides a click feeling when the reversing plate is pushed in to bend and deform.

In the switch element of the present invention, the bulging surface of the reversing plate is attached to the cover film,
An arc-shaped cut 50 that is concentric with the reversing plate and opens to form an air flow opening is formed at a position outside the outer peripheral contour 30a of the reversing plate in the cover film.

In the present invention, the cut formed in the cover film is not always open, and is distinguished from the slit 3 which is always open described in FIG. The cut 50 forms an air circulation port by opening. Therefore, when a cut is opened due to the reversing operation of the reversing plate with the displacement of the cover film, air flows through the opened cut, so that a situation that hinders the good reversing operation of the reversing plate does not occur. Therefore, the inverting operation of the inverting plate is performed well, and a clear click feeling can be obtained. Further, when the cut is closed, dust does not enter the place where the reversing plate is installed from the cut.

In particular, since the notch is formed in a circular arc shape concentric with the reversing plate, when the reversing plate is reversed with the displacement of the cover film, biased tension is less likely to be applied to the cover film. . Therefore, when the reversing plate is pushed in, the situation in which the direction of the pushing force is delicately changed by the biased tension of the cover film and the operability is reduced is less likely to occur.

The above-described operation is such that the notch is opened when the reversing plate is pushed in and performs a concave reversing operation together with the cover film to form an air flow opening, and is closed when the reversing plate is in a no-load state. It is remarkably exhibited by having become.

In the present invention, the arc-shaped notch is
It may be formed only at one place, or may be formed at more than two places. When the cuts are formed at a plurality of positions, the cuts may be formed at equal angles or may be formed at different angles. When a plurality of cuts are formed at equal angles, for example, if the number of cuts is two, the cuts are formed every 180 degrees, and if the number of cuts is three, the cuts are formed every 120 degrees. If the number of cuts is 4, the cut is 9
It is formed every 0 degrees. Further, the plurality of cuts may or may not be of equal length. Furthermore, the plurality of cuts may or may not be formed on the same circumference. When the number of cuts is not equal, for example, when the number of cuts is four, the cuts are divided into two equal-length cuts and two equal-length cuts having different lengths from each other. It is desirable that cuts and short cuts are alternately arranged, two long cuts are arranged symmetrically, and two short cuts are also arranged symmetrically. In this case, it is desirable to form four cuts on the same circumference.

In the present invention, it is desirable that a plurality of arc-shaped cuts whose centers coincide with each other are formed at positions outside the outer peripheral contour line 30a of one reversing plate in the cover film. In addition, it is desirable that the plurality of arc-shaped cuts whose centers coincide with each other are formed at equal angles. According to these, in the case where the reversing plate performs the reversing operation with the displacement of the cover film, biased tension on the cover film is less likely to be applied. Therefore, when the reversing plate is pushed in, the situation in which the direction of the pushing force is delicately changed due to the biased tension of the cover film and the operability is reduced is extremely unlikely to occur. This effect is more remarkably exhibited when the plurality of cuts are equal in length.

The switch S according to the present invention is formed by using the above-described switch element S1. The switch according to the present invention can be formed by directly attaching the cover film to the surface of the wiring board 40 or by attaching the cover film to the surface of the intermediate sheet 60 as described in FIG. It may be formed by wearing.

In the former case, the cover film of the switch element is adhered to the surface of the wiring board having the center electrode 41 and the peripheral electrode 42, whereby the reversing plate of the switch element is positioned on the wiring board. The outer peripheral portion of the reversing plate is a normally closed contact that is always in contact with the peripheral electrode, and the reversing operation of the reversing plate is performed on a portion of the reversing plate except for the outer peripheral portion where the normally closed contact is formed. A cover film in which a normally open contact to be separated from the center electrode is formed, and a cut of the switch element formed in the cover film is formed outside the outer peripheral contour of the reversing plate and around the reversing plate. And the wiring board are located inside an annular sticking boundary line.

In the latter case, the cover film of the switch element is attached to the surface of the intermediate sheet, so that the reversing plate of the switch element is accommodated in the opening provided in the intermediate sheet. By laminating the intermediate sheet with the cover film attached to a wiring board having electrodes and peripheral electrodes, the normally closed contacts formed on the outer peripheral portion of the reversing plate contact the peripheral electrodes,
And, a normally open contact formed in a portion of the reversing plate other than the outer peripheral portion where the normally closed contact is formed is opposed to the center electrode contacted by the normally open contact by the reversing operation of the reversing plate,
The cut of the switch element formed on the cover film is outside the outer contour of the reversing plate and inside the annular sticking boundary between the cover film and the intermediate sheet formed around the reversing plate. Is employed.

The operation of the former and latter switches will be described with reference to the embodiments described below.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a switch sheet 1 provided with a large number of switch elements S1 used in a cellular phone or the like.
0 is a plan view. The switch sheet 10 has a large number of circular dome-shaped reversing plates 30 swelled on the back side of one cover film 20 via an adhesive layer,
Each reversing plate 30 is arranged in a predetermined state.
The reversing plate 30 is made of a conductor such as a metal plate. FIG. 2 shows one reversing plate 30 in the switch sheet 10 of FIG.
Is shown in an enlarged manner.

FIG. 3 shows the cover film 20.
Is attached to the surface of the wiring board 40, and the reversing board 30 is attached to the wiring board 40.
The switch S formed by mounting the switch S in FIG.
It is shown as a cross-sectional view taken along a line II-III. FIG. 4 shows a case where the reversing plate 30 mounted on the wiring board 40 of the switch S is reversed.

As clearly shown in FIG. 2, an arc-shaped cut 50 formed concentrically with the reversing plate 30 and opened to form an air flow opening at a position outside the outer contour 30a of the reversing plate 30 in the cover film 20. Are formed. In the switch S shown in the figure, four arc-shaped cuts 50 whose centers coincide with each other are formed at intervals of 90 degrees, and the cuts 50 have the same length.

As shown in FIG. 3 or FIG. 4, the wiring board 40 has a center electrode 41 and a peripheral electrode 42 on the surface thereof, and the reversal plate 30 is formed by attaching the cover film 20 to the surface. It is positioned and mounted on the wiring board 40. The outer peripheral portion 31 of the reversing plate 30 is a normally closed contact that is always in contact with the peripheral electrode 42, and the reversing plate 3 is provided at a portion other than the outer peripheral portion 31 where the normally closed contact of the reversing plate 30 is formed.
A normally open contact that is separated from the center electrode 41 by the inversion operation of 0 is formed. The cut 50 is located outside the outer contour 30 a of the reversing plate 30 and inside the annular bonding boundary 21 between the cover film 20 formed around the reversing plate 30 and the wiring board 40. ing.

In this case, the sticking boundary line 21 is the reverse plate 3
0 is a boundary line formed by being formed in a circular dome shape. That is, the circular dome-shaped reversing plate 3
Cover film 20 with the bulging surface of the
When properly adhered to the surface of the reversing plate 30 as shown in FIG.
A portion where the cover film 20 is not adhered to the reversing plate 30 or the wiring board 40 is inevitably generated inside and outside the outer peripheral contour line 30a. In this case, the boundary between the region where the cover film 2 is adhered to the surface of the wiring board 40 and the region where the cover film 2 is not adhered to the surface of the wiring board 40 is the above-mentioned adhesion boundary line 21. The sticking boundary 21 is formed in an annular shape concentric with the reversing plate 30. In FIG. 1, the sticking boundary line 21 is indicated by a broken line for reference.

In the switch S shown in FIG.
Is in a no-load condition. Therefore, when the reversing operation of the reversing plate 30 is performed, the cover film 20
There is no tension applied to add zero. At this time, the cut 50 of the cover film 20 is closed as shown. Therefore, when the reversing plate 30 is not turned over, dust does not enter the installation location of the reversing plate 30 from the cut 50.

In the switch S shown in FIG.
Is pushed in, and the cover film 20 and the cover film 20 are turned in a concave shape. At this time, the cut 50 of the cover film 20 is opened by the tension applied to the cover film 20 as shown to form an air circulation port. The notch 50 is opened when the reversing operation of the reversing plate 30 is started and the tension is applied to the cover film 20, so that the reversing plate 30 performs a good reversing operation. Click feeling is obtained.

In this embodiment, the cover film 2
At 0, four arc-shaped cuts 50 that are concentric with the circular dome-shaped reversing plate 30 and whose centers coincide with each other are formed at 90-degree intervals, and each cut 50 has the same length. When the reversing plate 30 is reversed, a biased tension is not easily applied to the cover film 20. for that reason,
Displacement of the cover film is less likely to occur, and good operability is maintained for a long time. Further, FIG. 3 or FIG.
As shown in FIG.
Since it is not stuck to 0, the displacement of the outer peripheral portion 31 of the reversing plate 30 is not restricted when the reversing plate 30 performs the reversing operation.

In FIG. 5, the cover film 20 is attached to the surface of the intermediate sheet 60, and the intermediate sheet 60 is
The switch S is shown as a cross-sectional view taken along a line VV in FIG. Further, FIG. 5 shows a case where the reversing plate 30 mounted on the wiring board 40 of the switch S is reversed.

As shown in FIG. 5, the intermediate sheet 60 is provided with a circular opening 61, in which the reversing plate 30 is accommodated. In addition, the normally closed contact formed on the outer peripheral portion 31 of the reversing plate 30 contacts the peripheral electrode 42 of the wiring board 40 on which the intermediate sheet 60 is laminated, and the reversing plate 30 contacts the center electrode 41 of the wiring board 40. The normally-open contacts formed at portions other than the outer peripheral portion 31 at which the normally-closed contacts are formed face each other. The cut 50 formed in the cover film 20 is located outside the outer peripheral line 30 a of the reversing plate 30 and the annular bonding boundary between the cover film 20 and the intermediate sheet 60 formed around the reversing plate 30. It is located inside the line 22.

In this case, the sticking boundary line 22 is defined as follows: the reversing plate 30 is housed in the opening 61 of the intermediate sheet 60;
This is a boundary line formed because the reversing plate 30 is formed in a circular dome shape. That is, the cover film 2 on which the bulging surface of the circular dome-shaped reversal plate 30 is adhered.
When the cover film 20 is properly adhered to the surface of the intermediate sheet 60 as shown in FIG.
Inevitably, a portion that is not stuck on the wiring board 40 is generated. In this case, the area where the cover film 2 is adhered to the surface of the intermediate sheet 60 is
Is the adhering boundary line 22 with a region not adhered to the surface of the intermediate sheet 60, and the adhering boundary line 22
Is formed in an annular shape at the edge of the opening portion 61. In FIG. 1, the sticking boundary line 22 is indicated by a broken line for reference.

In the switch S shown in FIG.
Is in a no-load condition. Therefore, when the reversing operation of the reversing plate 30 is performed, the cover film 20
There is no tension applied to add zero. At this time, the cut 50 of the cover film 20 is closed as shown. Therefore, when the reversing plate 30 is not turned over, dust does not enter the installation location of the reversing plate 30 from the cut 50.

In the switch S shown in FIG.
Is pushed in, and the cover film 20 and the cover film 20 are turned in a concave shape. At this time, the cut 50 of the cover film 20 is opened by the tension applied to the cover film 20 as shown to form an air circulation port. The notch 50 is opened when the reversing operation of the reversing plate 30 is started and the tension is applied to the cover film 20, so that the reversing plate 30 performs a good reversing operation. Click feeling is obtained.

In this embodiment, the cover film 2
At 0, four arc-shaped cuts 50 that are concentric with the circular dome-shaped reversing plate 30 and whose centers coincide with each other are formed at 90-degree intervals, and each cut 50 has the same length. When the reversing plate 30 is reversed, a biased tension is not easily applied to the cover film 20. for that reason,
Displacement of the cover film 20 is less likely to occur, and good operability is maintained for a long time. Further, as shown in FIG. 5 or FIG. 6, since the outer peripheral portion 31 of the reversing plate 30 is not attached to the cover film 20, the displacement of the outer peripheral portion 31 of the reversing plate 30 is restricted when the reversing plate 30 performs the reversing operation. It will not be done.

In FIGS. 5 and 6, the same or corresponding parts as those described in FIGS. 3 and 4 are denoted by the same reference numerals.

[0041]

According to the switch element or switch of the present invention, the air needs to enter and exit at the time of the reversing operation of the reversing plate (the periphery of the reversing plate: the position outside the outer contour of the reversing plate). Air can be moved in and out when necessary, and dust is prevented at other times. Further, at the time of the reversing operation of the reversing plate, a situation that hinders the reversing operation does not occur. Therefore, according to the switch element or the switch of the present invention, a favorable reversing operation of the reversing plate is performed, and a click feeling accompanying the reversing operation is also satisfactorily exhibited. In addition, good operability and operation reliability of the reversing plate,
Contact stability is ensured for a long time.

[Brief description of the drawings]

FIG. 1 is a plan view of a switch sheet 10 provided with a large number of switch elements according to the present invention.

FIG. 2 is an enlarged plan view of one switch element S1 of FIG. 1;

FIG. 3 shows an embodiment of a switch according to the present invention in FIG.
It is sectional drawing cut | disconnected in the part which follows the I-III line.

FIG. 4 is a cross-sectional view of the switch of FIG. 3 in a state where a reversing plate 30 is reversed.

FIG. 5 is a cross-sectional view of another embodiment of the switch according to the present invention, taken along a line VV of FIG. 2;

FIG. 6 is a cross-sectional view of the switch of FIG. 5 in a state where a reversing plate 30 is reversed.

FIG. 7 is a plan view of a conventional switch element or switch.

FIG. 8 is a plan view of another conventional switch element or switch.

[Explanation of symbols]

S switch S1 switch element 20 cover film 21 annular sticking boundary line between cover film and wiring board 22 annular sticking boundary line between cover film and intermediate sheet 30 reversing plate 30a outer contour line of reversing plate 31 of reversing plate Outer peripheral part 40 Wiring board 41 Center electrode 42 Peripheral electrode 50 Cut 60 Intermediate sheet 61 Opening

Claims (6)

[Claims] 1. A switch element having a cover film and a circular dome-shaped reversing plate made of a conductor adhered to the cover film, wherein a bulging surface of the reversing plate is adhered to the cover film and a cover is provided. A switch element, wherein an arc-shaped cut is formed at a position outside of an outer peripheral contour of the reversing plate in the film and is concentric with the reversing plate and opens to form an air flow opening. 2. The notch is opened to form an air flow port when the reversing plate is pushed in and performs a concave reversing operation together with the cover film, and is closed when the reversing plate is in a no-load state. The switch element according to claim 1, wherein 3. A plurality of arc-shaped cuts whose centers coincide with each other are formed at equal angles at positions outside the outer peripheral contour of one reversing plate in the cover film.
Or the switch element according to claim 2. 4. The plurality of cuts are equal in length.
Switch element described in. 5. A switch using the switch element according to any one of claims 1, 2, 3, and 4, wherein the switch is provided on a surface of a wiring board having a center electrode and a peripheral electrode. The reversing plate of the switch element is positioned and mounted on the wiring board by being adhered to the cover film of the element, and the outer peripheral portion of the reversing plate is a normally closed contact that is always in contact with the peripheral electrode, and A normally open contact that is separated from the center electrode by a reversing operation of the reversing plate is formed in a portion of the reversing plate other than the outer peripheral portion where the normally closed contact is formed, and the switch element formed on the cover film is A switch characterized in that the cut is located outside the outer peripheral contour of the reversing plate and inside the annular sticking boundary between the cover film formed around the reversing plate and the wiring board. 6. A switch using the switch element according to any one of claims 1, 2, 3, and 4, wherein a cover film of the switch element is attached to a surface of an intermediate sheet. By reversing the switch element in the opening provided in the intermediate sheet, the intermediate sheet in which the cover film is adhered to a wiring board having a center electrode and a peripheral electrode is laminated. Thereby, the normally closed contact formed on the outer peripheral portion of the reversing plate contacts the peripheral electrode, and the normally open contact formed on a portion of the reversing plate excluding the outer peripheral portion where the normally closed contact is formed. But,
The cut of the switch element formed on the cover film is opposed to the center electrode contacted with the normally open contact by the reversing operation of the reversing plate. A switch which is located inside an annular sticking boundary between a cover film formed around and an intermediate sheet.