KR100572538B1 - Reverse spring for push button switch and push button switch using the same - Google Patents

Abstract

(Problem) Provides a reverse spring for a push button switch and a push button switch using the same, which can be obtained by a simple configuration, the desired click feeling, and easy to manufacture.

(Solution means) Bendable portions are formed between the base portion 5f, the pressing portion 5e having the pressing surface portion 5b at the upper end, and the base portion 5f and the pressing portion 5e. The skirt portion 5a is obtained by buckling by pressing 5e to obtain a click feel, and the skirt portion 5a is formed into an inclined surface that is tapered from the base portion 5f to the pressing portion 5e. And the inclined surface is formed of the first and second inclined surfaces 5g and 5h having different inclination angles at the base portion 5f side and the pressing portion 5e side, and the intersection of the first and second inclined surfaces 5g and 5h. The click adjustment part 5i which adjusts the click feeling when the skirt part 5a was buckled at the edge was formed.

Description

REVERSE SPRING FOR PUSH BUTTON SWITCH AND PUSH BUTTON SWITCH USING THE SAME}

1 is a plan view illustrating a push button switch according to an embodiment of the present invention.

2 is a cross-sectional view showing a push button switch according to an embodiment of the present invention.

3 is a plan view showing an inverting spring which is an embodiment of the present invention.

4 is a cross-sectional view showing an inverting spring which is an embodiment of the present invention.

It is explanatory drawing which shows the operating force characteristic of the reverse spring of this invention.

6 is a plan view illustrating a conventional push button switch.

7 is a cross-sectional view showing a conventional push button switch.

(Description of Major Symbols in the Drawing)

1: housing

1a: storage

1b: guide groove

1c: storage wall

2: fixed contact

2a: terminal part

2b: contact

3: fixed contact

3a: terminal part

3b: contact

4: movable contact

4a: rib part

4d: contact piece

4e, 4f: protrusions

4g: protrusion

5: reverse spring

5a: skirt section

5b: Push surface part

5c: outer circumference edge

5d: working protrusion

5e: pressing part

5f: base part

5g: first slope

5h: second slope

5i: click adjuster

6: stem

6a: pressing part

6b: push projection

6c: guide protrusion

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a push button switch used as a switch for operating various electronic devices, and more particularly to a structure of a push button switch using a rubber spring as an inverting spring.

As a structure of the conventional pushbutton switch, the movable contact and the rubber spring which press this movable contact to the fixed contact side are arranged in the accommodating part of the housing with a fixed contact fixed, and the elastic force of this rubber spring is arrange | positioned. The push button switch which returns a stem for operation is known (for example, refer patent document 1).

Hereinafter, a structure of a conventional push button switch will be described with reference to the drawings.

6 is a plan view of a conventional push button switch, and FIG. 7 is a sectional view of a conventional push button switch.

In the figure, the housing 31 is formed in the shape of a box in which the upper surface side is opened by an insulating material such as synthetic resin. The housing 31 is provided with an accommodating portion 31a having an accommodating wall portion 31b on its lower surface side, and a pair of fixed terminals formed by bending an electrically conductive material such as a metal plate on the inner bottom of the accommodating portion 31a. (32, 33) are embedded. One end side of the pair of fixed terminals 32 and 33 is exposed from the inner bottom surface of the housing 31 to form contact portions 32a and 33a, respectively, and the other end side is led outward of the housing 31 to each other. Terminal portions 32b and 33b are formed.

The movable contact 34 is formed of a thin metal sheet having a conductive spring shape, and has an annular rib portion 34a and a contact piece 34b integrally cut in the center thereof. The movable contact 34 is mounted in a state where the rib portion 34a is connected to the contact portion 33a of the fixed terminal 33, and the contact piece 34b is a contact portion of the fixed terminal 32. It is provided so as to face 32a and separated.

The rubber spring 35 is formed of a flexible elastomer, silicone rubber, or the like, and has a skirt shape 35a which is bent at the time of pressing and returning to have a dome shape of which the outer surface has an open shape, and is provided with elasticity. It consists of the pressing surface part 35b formed in the upper part of the skirt part 35a, and the outer periphery edge part 35c formed in the lower part. This outer periphery edge part 35c is inserted and supported by the accommodating wall part 31b formed in the accommodating part 31a of the said housing 31. As shown in FIG.

An actuating protrusion 35d is formed on the lower surface side of the pressing face part 35b, and the tip of the actuating protrusion 35d presses the contact piece 34b of the movable contact 34 so that the fixed terminal 32 is closed. It is made to conduct with the contact part 32a.

The stem 36 is formed of an insulating material such as synthetic resin, and is inserted into and attached to the opening of the housing 31, and the pressing projection 36a of the stem 36 is the pressing surface portion 35b of the rubber spring 35. Abuts against the rubber spring 35 downwardly. After the stem 36 is pressed down, the stem 36 is returned to the initial position by the elastic force when the skirt portion 35a of the rubber spring 35 is bent and returned.

[Patent Document 1]

Japanese Unexamined Patent Publication No. 2000-260256

However, in the structure of the conventional push button switch mentioned above, in order to prepare the rubber spring which changed the intensity | strength of a click feel, since the design is adjusted by the combination of the thickness and inclination angle of the skirt part of a rubber spring, the whole shape is changed significantly. It was difficult to get the desired click feel.

It is also conceivable to adjust the click feel by providing ribs in the skirt portion. However, since the rubber material is molded into a mold and manufactured, the complexity of the skirt portion increases the cost of manufacturing and molding the mold and increases the cost. there was.

Accordingly, an object of the present invention is to provide a reverse button for a push button switch and a push button switch using the same, which can solve the problems described above, obtain a desired click feel with a simple configuration, and are easy to manufacture.

MEANS TO SOLVE THE PROBLEM In order to solve the said subject, in this invention, as a 1st means, it is formed so that it can be bend | folded between a base part, a press part which has a press surface part at the upper end, and the said base part and the said press part, and presses the said press part And a skirt portion obtained by buckling by the claw, wherein the skirt portion is formed into an inclined surface that is tapered from the base portion to the pressing portion, and the inclined angle is formed at the base portion side and the pressing portion side. Is formed of different first and second inclined surfaces, and a click adjusting portion for adjusting a click feel when the skirt portion is buckled at the intersection of the first and second inclined surfaces is formed.

In addition, the skirt portion may form the first and second inclined surfaces so as to have a constant thickness from the base portion to the pressing portion as a second means.

Further, as a third means, the inclination angle of the inclined surface of the skirt portion is formed such that the second inclined surface on the pressing portion side is larger than the first inclined surface on the base portion side.

Further, as a fourth means, the position of the intersection portion of the first and second inclined surfaces of the skirt portion is formed in the range of 20% to 70% with respect to the length from the extension portion of the base portion to the extension portion of the pressing portion. It features.

The fifth spring means is fixed by the inversion spring according to any one of the first to fourth means, a housing holding the base portion of the inversion spring, a fixed contact provided in the housing, and a buckling of the skirt portion of the inversion spring. And a movable contact which is in contact with the contact.

Embodiment of the invention

1 to 5 show one embodiment of a reverse spring and a push button switch for a push button switch of the present invention. 1 is a plan view of a push button switch, FIG. 2 is a sectional view of a push button switch, FIG. 3 is a plan view of a reverse spring, FIG. 4 is a sectional view of a reverse spring, and FIG. 5 is an explanatory view showing operating force characteristics of the reverse spring.

The housing 1 is formed in the shape of a rectangular box with an upper surface opened by an insulating material such as synthetic resin. An opening 1a is formed in the opening of the housing 1, and a pair of fixed contacts 2 and 3 formed of a conductive metal material such as brass is formed on the inner bottom of the housing 1a. The housing 1 is integrally molded and installed by a method such as insert molding.

Moreover, in the inner wall part of the accommodating part 1a of the said housing | casing 1, the guide groove part 1b in which the guide protrusion part 6c of the stem 6 mentioned later is engaged by diagonal square is formed. By forming the guide groove 1b, the stem 6 can be guided into the housing 1 and regulated at the time of lifting and lowering the stem 6 to be described later.

Moreover, the accommodating wall part 1c is formed in the inner wall part of the lower surface side of the said accommodating part 1a. The lower end peripheral edge part 5c of the reverse spring 5 mentioned later is supported by this accommodating wall part 1c. Moreover, a part of the said accommodating wall part 1c and a part of the said guide groove part 1b are formed in contact with one another, and with respect to the inner bottom face of the inner side surrounded by the said accommodating wall part 1c of the said accommodating part 1a, The surface of the inner bottom part of the guide groove part 1b is formed in one low position.

And a part of the accommodating wall part 1c and the part of the said guide groove part 1b of the said housing | casing 1 are formed in contact with one another, and this part which is connected is in communication with the space part of the inner surface side of the inversion spring 5 mentioned later. It is to configure the air flow path.

In this way, the guide groove 1b is formed in contact with a part of the accommodating wall portion 1c of the housing 1 to form an air passage communicating with the inner surface side of the reverse spring 5 described later. When the reversal operation is performed by pressing the reversal spring 5, the reversal spring 5 is supported even if the receiving wall 1c of the housing 1 and the lower outer periphery 1c of the reversing spring 5 are held in close contact with each other. Since the air inside can be taken out to the outside, the inversion and return of the inversion spring 5 can be performed reliably.

The pair of fixed contacts 2 and 3 are embedded in the inner bottom of the housing 1, and a plurality of bent portions are formed in the middle of the embedding portion, and one end thereof extends outward of the housing 1. Terminal portions 2a and 3a are formed. Moreover, the other end side is expressed on the inner bottom surface of the inner side surrounded by the receiving wall portion 1c of the housing portion 1a of the housing 1, and has a pair of contact portions 2b and 3b which are provided to face each other with a constant gap therebetween. Is formed.

The movable contact 4 is formed from a springy phosphor bronze plate, a stainless steel plate, or the like, and has an outer shape substantially circular, and a ring-shaped rib portion 4a is formed on the outside thereof. Inside the rib part 4a, the contact piece 4d in which one end is connected to the said rib part 4a, and the other end is cut | disconnected integrally is formed. The contact piece 4d is formed to be able to swing on the rib portion 4a, and the tip side thereof is bent at an angle so as to be slightly inclined upward.

The contact piece 4d is provided with a contact protrusion 4e for abutting the reverse spring 5 on a surface facing the reverse spring 5 described later, i.e., an upper surface cut, inclined and bent. have. By forming this protrusion part 4e, since the substantially center part of the contact piece 4d is pressed, contact is stabilized. Moreover, the some surface 4f which contact | connects the contact part 2b of the said fixed contact 2 is formed in the lower surface, and stable contact is obtained.

Moreover, the projection part 4g which protrudes to the said fixed contact 3 side is formed in the lower surface side of the said rib part 4a. By forming this projection part 4g, when the said movable contact 4 is inserted between the lower surface of the inversion spring 5 mentioned later and the said fixed contact 3, and it mounts on the fixed contact 3, a contact part ( 3b) and the said projection part 4g abut, and the circumference | surroundings do not adhere, and the clearance gap is ensured. And by this, the said movable contact 4 is always in contact with the said fixed contact 3, and the said contact piece 4d is formed so that contact separation is possible with the fixed contact 2, and comprises the contact of a switch.

By forming the projection 4g in the movable contact 4 in this manner, the space portion on the inner surface side of the reverse spring 5 and the guide groove 1b of the housing 1 can communicate with each other. From the gap between the movable contact 4 and the fixed contact 3 formed by 4g, air in the reverse spring 5 is reliably introduced into the guide groove 1b, thereby inverting the reverse spring 5 In this case, the return can be reliably performed.

The reversing spring 5 is formed by transferring a mold shape by sandwiching a sheet material such as a flexible elastomer or silicone rubber between a mold made of an upper mold and a lower mold and heating and pressing, and the outer shape is a dome of an open shape having a lower surface. The press part 5e which has the skirt part 5a which is bent and the elastic force is given at the time of movement and return of a stem mentioned later, and the press surface part 5b formed in the upper end side of this skirt part 5a, It consists of the base part 5f which has the outer periphery edge part 5c formed in the lower end side of the skirt part 5a. The lower reference surface 5j of the base portion 5f forms the reference mounting surface to the housing. An actuating protrusion 5d is formed on the lower surface side of the pressing surface portion 5b, and the tip of the actuating protrusion 5d is formed with the protruding portion 4e formed on the upper surface side of the contact piece 4d of the movable contact 4. It is supposed to touch.

The reverse spring 5 is formed with an inclined surface in which the skirt portion 5a is tapered from the base portion 5f to the pressing portion 5e. The inclined surface is formed such that the skirt portion 5a has a constant thickness from the base portion 5f to the pressing portion 5e.

Moreover, another inclination angle consists of the 1st inclined surface 5g which rises from the said base part 5f side, and the 2nd inclined surface 5h which descends from the press part 5e side to the said skirt part 5a. Two inclined surfaces having a click adjustment portion 5i for adjusting the click feel when the skirt portion 5a is buckled and inverted at the intersection of the first inclined surface 5g and the second inclined surface 5h. To form.

Moreover, with respect to the inclination angle α from the lower end surface 5j of the base portion 5f of the first inclined surface 5g formed on the side of the base portion 5f, the second inclined surface formed on the pressing portion 5e side ( 5h) is formed so that the inclination-angle (beta) from the lower end surface 5j of the base part 5f may become large (refer FIG. 4).

In the present embodiment, the inclination angle α is formed to be 60 degrees, and the inclination angle β is configured to be 65 degrees. In addition, although the intersections of the first and second inclined surfaces 5g and 5h are connected in a linear shape, they may be connected by an arc surface. The first and second inclined surfaces 5g and 5h are formed so that the skirt portion 5a becomes a constant thickness from the base portion 5f to the pressing portion 5e, but the thickness is appropriately changed. It may be formed by.

Thus, since the inclination angles (alpha), (beta) of the inclined surface of the skirt part 5a were formed so that the 2nd inclined surface 5h of the press part 5e side might become larger than the 1st inclined surface 5g of the base part 5f side, Compared to the straight skirt portion, the intersection of the inclined surface of the skirt portion 5a projects inward from the initial state, so that when pressed, the inverted skirt portion 5a is flattened and curved in the opposite direction again when pressed. Since the operation is executed, the click feeling at the time of inversion can be increased.

5 shows the operating force characteristics of the reversing spring 5, the vertical axis representing the load for pressing the reversing spring 5, and the horizontal axis representing the stroke in which the reversing spring 5 is bent.

In the figure, point P represents a point where the stroke is a peak position of the operating force (a point at which the skirt portion 5a is pressed and inverted). Moreover, curves AH show the position of the click adjustment part 5i formed by the intersection of the said 1st inclined surface 5g and the 2nd inclined surface 5h from the extension part of the said base part 5f from the press part ( 5e) shows the case where the length (height) L to the extension part is changed, where curve A is 0% (the base of the base part 5f), curve B is 20%, curve C is 40%, and curve D is 50%, curve E is 60%, curve F is 70%, curve G is 80%, curve H is 100% (the source of the pressing portion 5e), respectively.

In the present embodiment, the inclined surface formed on the skirt portion 5a is a position of the click adjusting portion 5i formed by the intersection of the first inclined surface 5g and the second inclined surface 5h. The length (height) from the extension part of 5f) to the extension part of the press part 5e is formed in 20%-70% of range. Thus, by forming the intersections of the first and second inclined surfaces 5g and 5h in the range of 20% to 70%, as shown in FIG. 5, the click feeling when the skirt portion 5a is buckled and reversed is increased (higher). I can do it. 5, curve C (40%) shows the best value.

The stem 6 is formed in a substantially circular shape from a molding material such as a synthetic resin, and the upper surface portion is provided with a flat pressing portion 6a operated by a human finger or the like. On the lower surface side opposite to the pressing portion 6a, the lower surface side abuts against the upper surface of the pressing surface portion 5b of the inversion spring 5, and protrudes toward the lower surface side to bend the inversion spring 5 toward the movable contact 4 side. The pressing projection 6b is formed.

Further, four guide protrusions 6c protruding in the cross direction are formed on the lower surface side of the side surface of the stem 6. And when said stem 6 is inserted and attached to the opening part of the accommodating part 1a of the said housing 1, the said guide groove part 1b is provided in the said guide groove part 6c in the inner wall part of the accommodating part 1a. ) Is mounted on the housing 1 so as to be movable up and down.

Next, the operation of the push button switch having the above configuration will be described.

First, when the pressing portion 6a of the stem 6 is pressed with a human finger or the like, the pressing projection 6b presses the pressing surface portion 5b of the reversing spring 5, and the skirt portion 5a is buckled. The bent portion 5d moves downward by bending.

And as shown by the solid line in FIG. 5, when predetermined stroke moves and the load of an operating force becomes a peak position, the said skirt part 5a is reversed and the said operation protrusion 5d will move automatically and move to the lower side. . And the said projection 5d contacts the protrusion part 4e of the upper surface side of the contact piece 4d of the said movable contact 4, and the protrusion part of the lower surface side of the contact piece 4d of the said movable contact 4 is carried out. 4f conducts with the fixed contact 2, and the contact is turned on.

When the stem 6 is released in this state, the stem 6 is elastically supported upward by the elastic force of the skirt portion 5a of the reverse spring 5 to return to the initial position. At this time, the contact piece 4d of the movable contact 4 is also returned to the upper side by its spring property, and the contact is turned OFF.

In this case, in the skirt portion 5a of the inversion spring 5, the first inclined surface 5g that rises from the base portion 5f side and the second inclined surface 5h that descends downward from the press portion 5e side. Two inclined surfaces having different inclination angles are formed, and the click feel when the skirt portion 5a is buckled and inverted at the intersection of the first inclined surface 5g and the second inclined surface 5h. The click adjustment part 5i which adjusts this is formed. This click adjustment part 5i is formed in the state which protruded inward of the domed skirt part 5a.

For this reason, when the said press part 6b presses the press surface part 5b of the said inversion spring 5, while the said skirt part 5a buckles and swells outward and inverts, the said click adjustment part 5i ) Produces a stroke that suppresses (collecting) the skirt portion 5a from inverting outward. It is possible to increase (strengthen) the reversal force between these strokes, and when this stroke reaches the point P (the point at which the skirt portion 5a is bent and reversed), which is the peak position of the operating force, as shown in FIG. Since it is reversed instantaneously, a high (strong) click feel is obtained, and a desired operation feeling can be obtained at the time of operation.

In this case, the inclined angles of the first inclined surface 5g and the second inclined surface 5h are reversed to increase the first inclined surface, and the second inclined surface is made small so that the click adjusting portion 5i where the inclined surfaces of each other intersect. If it is formed in the state which protrudes outward of the dome-shaped skirt part 5a, the click feeling at the time of the inversion of the said operating force can be reversely weakened.

Thus, by appropriately selecting the inclination angles of mutually inclined surfaces, various operation peeling can be obtained at the time of operation.

According to the embodiment of the present invention, the skirt portion 5a of the reversing spring 5 is formed into an inclined surface that becomes tapered from the base portion 5f to the pressing portion 5e, and at the same time the base is inclined. It is formed by the 1st and 2nd inclined surfaces 5g and 5h from which the inclination angle differs in the part 5f side and the press part 5e side, and the skirt part (at the intersection part of the 1st and 2nd inclined surfaces 5g and 5h) Since the click adjustment part 5i which adjusts the click feeling when 5a) was buckled was formed, the angle of inclination of the inclined surface of the skirt part 5a of the reversing spring 5 was changed in two stages, thereby making it possible to obtain a larger shape without changing the shape. By simply changing the combination of the intersections and the inclination angles of the first and second inclined surfaces 5g and 5h, it is possible to easily form a desired click feel without changing the overall shape.

Moreover, since the skirt part 5a formed the 1st and 2nd inclined surfaces 5g and 5h so that it might become a fixed thickness from the base part 5f to the press part 5e, the 1st and 2nd inclined surfaces 5g 5h) can be formed by a combination of linear inclined surfaces, and thus the configuration thereof is simple. Therefore, the metal mold making and the molding can be simplified, and the manufacturing can be easily performed at low cost.

Moreover, when comprised by the pushbutton switch using the said inversion spring 5, the desired click feeling can be obtained by a simple structure, and the pushbutton switch which is easy to manufacture can be provided.

Further, in the above embodiment, the spring-like movable contact 4 of the metal plate can be connected to the fixed contacts 2 and 3 in the housing 1a of the housing 1 made of synthetic resin formed in a rectangular box shape. It is installed so as to face each other, and it is set as the structure which switches this contact by pressing this movable contact 4 with flexible inversion spring 5, but it is not limited to this, but instead of the movable contact 4, the inversion spring 5 is carried out. A contact made of silver, carbon, or the like may be formed on the lower surface of the working projection 5d of the contact portion, and may be directly disconnected from the fixed contacts 2, 3.

The housing 1 may be formed of a substrate made of a phenol laminate, and a fixed contact may be formed on the surface of the substrate, and a plurality of fixed contacts may be formed on the substrate, and a plurality of reverse springs 5 having the contacts may be provided. You may also In addition, a plurality of inversion springs 5 may be integrally formed on one rubber mat and provided on a substrate.

As described above, the push button switch of the present invention is formed to be bent between the base portion, the pressing portion having the pressing surface portion at the upper end, and the base portion and the pressing portion, and the buckling is obtained by buckling by the pressing of the pressing portion to obtain a click feeling. The skirt portion is formed, and the skirt portion is formed into an inclined surface that is tapered from the base portion to the pressing portion, and the inclined surface is formed into first and second inclined surfaces having different inclination angles from the base portion side and the pressing portion side. And a click adjusting portion for adjusting the click feel when the skirt portion is buckled at the intersection of the second inclined surface. By changing the inclination angle of the inclined surface of the skirt portion of the reversing spring in two steps, the first and the first Simply change the intersection of the inclined surface and the combination of the inclination angle, the desired click texture without changing the overall shape It can be formed simply.

In addition, since the skirt portion is formed with the first and second inclined surfaces so as to have a constant thickness from the base portion to the pressing portion, the first and second inclined surfaces can be formed by a combination of linear inclined surfaces. Can be manufactured.

Further, since the inclination angle of the inclined surface of the skirt portion is formed to be larger than the first inclined surface on the base portion side, the intersection of the inclined surfaces of the skirt portion protrudes inward from the initial state as compared with the straight skirt portion. Since the inverting operation is performed in which the inner concave skirt portion is flattened and bent in the opposite direction again, the click feel during inversion can be enhanced.

Moreover, since the position of the intersection part of the 1st and 2nd inclined surfaces of a skirt part was formed in 20 to 70% of the range from the extension part of a base part to the extension part of a press part, compared with a linear skirt part, it has a click feeling reliably. Since it is possible to increase the desired click feeling easily.

Moreover, since it has a reverse spring as described in any one of these, the housing holding the base part of this reverse spring, the fixed contact provided in the housing, and the movable contact which isolate | separates from a fixed contact by the buckling of the skirt part of a reverse spring, it is a push button In the case of a switch, it is possible to provide a push button switch that can be obtained with a simple configuration and easy to manufacture.

Claims (5)

With the base part, A pressing part having a pressing surface part at the top, A skirt portion formed between the base portion and the pressing portion so as to be bendable, and buckled by pressing the pressing portion to obtain a click feel, The skirt portion is formed into an inclined surface that is tapered from the base portion to the pressing portion, and the inclined surface is formed into first and second inclined surfaces having different inclination angles from the base portion side and the pressing portion side. A reverse spring for a push button switch, wherein a click adjusting portion for adjusting a click feel when the skirt portion is buckled at an intersection of the first and second inclined surfaces is formed. The reverse spring for a push button switch according to claim 1, wherein said skirt portion forms said first and second inclined surfaces so as to have a constant thickness from said base portion to said pressing portion. The push button switch inversion spring according to claim 1 or 2, wherein an inclination angle of the inclined surface of the skirt portion is formed so that the second inclined surface of the pressing portion side is larger than the first inclined surface of the base portion side. The method of claim 1, wherein the position of the intersection of the first and second inclined surfaces of the skirt portion is formed in a range of 20% to 70% with respect to the length from the extension portion of the base portion to the extension portion of the pressing portion. Reversal spring for push button switch The reverse spring of Claim 1, the housing holding the base part of this reverse spring, the fixed contact provided in the said housing, and the movable contact isolate | separated from the said fixed contact by the buckling of the skirt part of the said reverse spring. Push button switch.

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