WO2014077495A1

WO2014077495A1 - Dome switch and method for manufacturing same

Info

Publication number: WO2014077495A1
Application number: PCT/KR2013/007650
Authority: WO
Inventors: 정락환; 이중길
Original assignee: 주식회사 포콘스
Priority date: 2012-11-19
Filing date: 2013-08-27
Publication date: 2014-05-22
Also published as: CN104903986A

Abstract

The present invention relates to a dome switch and a method for manufacturing same, and more specifically, to a dome switch and a method for manufacturing same, wherein the entire edge of the dome switch can be fixed by means of soldering when mounting on a surface of a printed circuit board, so that installation direction is not limited by soldering positions, gaps are eliminated between the dome switch and the printed circuit board so that liquid such as water is prevented from being introduced to the inside, and wherein a wrapping cover comes into contact with a residual adhesive layer remaining on the edge of a film when wrapping a dome switch product so as not to adhere to the dome switch.

Description

Dome switch and its manufacturing method

The present invention relates to a dome switch and a method for manufacturing the same, and more particularly, to a dome switch and a method for manufacturing the switch is installed on a printed circuit board having a simple structure.

In general, the dome switch can obtain a switch signal through the inversion operation of the elastic dome.

Such a dome switch is mainly used for mobile phone operation keys or other electronic device input keys, and has a lower end fixed to a fixed contact of a printed circuit board and an upper end disposed on a switch contact of a printed circuit board. Has

When the convex upper end of the elastic dome is pressed, its upper end is concave elastically deformed, and in contact with the switch contact, the ON state is turned on. When the pressure is removed, the upper end of the elastic dome is returned convex again to form OFF. .

Korean Patent Publication No. 10-569205 discloses a dome switch structure for a keypad switch of an electronic product in which a plurality of contact terminals (lead wires) connected by a printed circuit board and solder are formed along a circumference of the dome switch.

However, such a conventional dome switch has a problem in that a liquid such as water may be introduced while a gap is formed between the printed circuit board and the dome switch which is not soldered when mounted on the printed circuit board.

In addition, the conventional dome switch is manufactured through the press working process of the contact terminal, the insert injection process of the pressed contact terminal, the adhesion process of the dome member, etc., and thus the manufacturing process is complicated. As the structure of the dome switch is complex and large in size, there is a problem in that it is converse with the miniaturization and thinning of a mobile phone.

In addition, in the case where the fixed contacts of the printed circuit board are formed in the number corresponding to the plurality of contact terminals, the direction of installation of the dome switch mounted on the printed circuit board may not be free without the plurality of contact terminals being symmetrical from front to back. There is a problem.

In particular, when packaging the product, there is a problem that the packaging cover is attached to the dome switch due to the residue of the adhesive layer remaining on the edge of the film. As a result, the packaging cover is stuck to the dome switch, so that a problem such as pick-up error occurs, such that there is a problem that it is difficult to efficiently operate the process.

[Preceding technical literature]

[Patent Documents]

Republic of Korea Patent Publication No. 10-569205 (2006. 04. 03.)

Republic of Korea Utility Model Registration Publication No. 20-275959 (2002. 05. 18.)

The present invention has been made to solve the above problems, the object of the present invention is as follows.

First, to provide a dome switch and a method of manufacturing the same so that the entire circumference can be fixed by soldering when mounting the surface on a printed circuit board so that there is no restriction in the installation direction according to the soldering position.

Second, to provide a dome switch and a manufacturing method for preventing a liquid such as water flows into the dome switch by preventing a gap between the dome switch and the printed circuit board.

Third, dome switch to reduce the cost due to the simplification of the manufacturing process and to minimize the height in the up and down direction by making the manufacturing only by press processing of the elastic dome and the holder and adhesion of the elastic dome and the press by the film And to provide a method for producing the same.

Fourthly, the packaging cover is in contact with the residue of the adhesive layer remaining on the edge of the film during the packaging of the dome switch to provide a dome switch for preventing the phenomenon of sticking to the dome switch.

In order to achieve the above object, the present invention is a dome switch is mounted on the surface of the printed circuit board is provided with a fixed contact, a switch contact located inside the fixed contact, and is packaged by a separate packaging cover, It is provided with a ring-shaped holder connected to the fixed contact; An elastic dome mounted on the holder and having a protrusion protruding upward; And a film positioned on an upper portion of the elastic dome to connect the holder and the elastic dome and sealing the hollow part of the holder, wherein the elastic dome presses the protrusion or releases the pressure according to the switch contact. It provides a dome switch characterized in that the contact and the contact is released.

The holder according to the invention is characterized in that it is formed in a circular or polygonal.

The holder according to the present invention is provided with a fence portion extending upwardly on the outer circumferential surface, the fence portion, while being separated from the edge of the film and blocking the contact with each other, while being seated on the holder It is characterized by guiding the film.

The fence unit according to the present invention is characterized in that it comprises a guide ring or a plurality of guide protrusions extending in an upward direction from the outer peripheral surface of the holder.

The holder according to the present invention, the annular step is formed on the inner peripheral surface, the elastic dome, the lower portion is mounted on the annular step, characterized in that the upper portion further comprises a mounting portion connected to the protrusion.

In the holder according to the present invention, a plurality of guide grooves recessed in an inward direction is formed on an outer circumferential surface, and the plurality of guide protrusions are formed to extend upward from an inner surface of the plurality of guide grooves, respectively. do.

The holder according to the present invention is characterized in that the entire outer circumference is fixed to the printed circuit board by soldering.

The present invention provides a manufacturing method for manufacturing a dome switch, the holder and the elastic dome press processing step of manufacturing the holder and the elastic dome by pressing the material; And it provides a dome switch manufacturing method comprising the step of adhering the holder and the elastic dome prepared in the holder and the elastic dome press processing step with the film.

According to the present invention, first, when the surface is mounted on a printed circuit board, the entire circumference is fixed by soldering so that there is no restriction in the installation direction according to the soldering position.

Second, since the entire circumference is mounted on the printed circuit board by soldering, gaps are not generated between the dome switch and the printed circuit board, and the inflow of liquid such as water into the dome switch is blocked.

Third, manufacturing is achieved only by the press processing of the elastic dome and the holder and the adhesion of the elastic dome and the press by the film, thereby reducing the cost due to the simplification of the manufacturing process and minimizing the height in the vertical direction. have.

Fourth, the packing cover is in contact with the residue of the adhesive layer remaining on the edge of the film when the product is packaged in the dome switch, thereby preventing the phenomenon of sticking to the dome switch. Effective operation is possible.

1 is a perspective view showing a dome switch according to the present invention.

Figure 2 is a longitudinal sectional perspective view showing a dome switch according to the present invention.

3 is a state diagram showing the longitudinal cross-sectional view of the dome switch according to the present invention.

4 and 5 is a perspective view showing another example of the holder in the dome switch according to the invention and a state diagram showing the state of being packed with a packaging cover.

6 is a longitudinal sectional view showing a mounting space in the dome switch according to the present invention.

7 and 8 are a plan view and a perspective view showing another example of the fence portion in the dome switch according to the present invention.

9 is a flowchart illustrating a method of manufacturing a dome switch according to the present invention.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

1 to 3, the present invention is mounted on a surface of a printed circuit board 100 having a fixed contact 110 and a switch contact 120 positioned inside the fixed contact 110. As the dome switch, the dome switch 1 is provided with a hollow portion 11, the ring-shaped holder 10 connected to the fixed contact 110, mounted on the holder 10 and protrudes upward An elastic dome 20 having a protruding portion 21 and a film positioned on an upper portion of the elastic dome 20 to connect the holder 10 and the elastic dome 20 and to seal the hollow part 11. (30).

The printed circuit board 100 may be formed in a general shape, and a plurality of the fixed contact point 110 and the switch contact point 120 may be formed.

In addition, the dome switch 1 may connect the fixed contact point 110 and the switch contact point 120 according to an artificial manipulation, and an ON state in which an electric signal may be transmitted may be transmitted by the connection. Become .

The holder 10 is made of a conductor and connects the fixed contact 110 and the elastic dome 20 so that an electrical signal can be transmitted from the fixed contact 110 to the elastic dome 20. .

The holder 10 may be formed in a polygonal ring shape including a square, a hexagon, and the like in which the hollow part 11 is formed inward, but is most preferably formed in a circular ring shape including an elliptical shape.

The dome switch 1 may be maintained in the form of the elastic dome 20 by the holder 10, as well as the external shock that can be transmitted to the elastic dome 20 is blocked, the occurrence of failure The cause is reduced.

The fixed contact 110 has the same shape as the holder 10, and when the holder 10 is formed in a polygonal ring shape or a circular ring shape, the fixed contact 110 is also formed in a polygonal ring or circular ring shape It can be understood that.

The switch contact 120 may be formed in a form corresponding to the fixed contact 110, and is disposed in the fixed contact 110 to be spaced apart from the fixed contact 110. For example, the switch contact 120 may be formed in a polygonal shape when the fixed contact 110 is formed in a polygonal ring shape, and may be formed in a circular shape when the fixed contact 110 is formed in a circular ring shape. .

The holder 10 is positioned at the fixed contact point 110 on the printed circuit board 100 and is soldered to the fixed contact point 110 by another surface mount device (SMD) having an outer circumference.

In addition, an inner circumferential surface constituting the hollow portion 11 is formed with an annular stepped portion 12 in which the lower end of the elastic dome 20 is mounted and contacted.

That is, the holder 10 is fixed to the printed circuit board 100 by soldering the entire outer circumference while blocking the inside and the outside, while the fixed contact 110 and the electrical signal can flow To be connected.

For this reason, the dome switch 1 may be freely fixed and installed without limitation in the installation direction according to the soldering position with the fixed contact 110, as well as liquid such as water into the dome switch 1. While the inflow of water is blocked, it is possible to prevent a failure due to the inflow of liquid.

Preferably, the elastic dome 20 is made of metal, and is drawn into the hollow part 11 and drawn out from the hollow part 11 through an inversion operation according to the pressure and the pressure disappearance applied to the protrusion 21. The contact with the switch contact 120 or the contact is released.

The elastic dome 20 is preferably formed in a circular shape, but is not limited thereto. The elastic dome 20 may be formed in various shapes in which an inversion operation may be implemented according to the applied pressure and the pressure disappearance.

On the other hand, the holder 10 is preferably formed in the inner circumferential surface forming the hollow 11, the annular stepped projection 12 is mounted on the elastic dome 20.

In addition, the elastic dome 20 includes a protrusion 21 protruding upward and a mounting portion 22 extending outward from an edge of the protrusion 21 to be mounted on the holder 10.

The mounting portion 22 is formed in a shape in which the diameter decreases from the lower end portion toward the protrusion portion 21 and has a gentle slope, and is preferably formed integrally with the protrusion portion 21 by press working.

Of course, the dome switch 1 may be easily manipulated while the protrusion 21 is positioned higher than the surface of the holder 10 by the mounting portion 22. According to the pressing of the protrusion 21, the mounting portion 22 may be pressed and pressed, thereby making contact with the holder 10 smoothly.

The film 30 is made of an insulator, and forms an adhesive layer 34 formed by applying an adhesive material to a lower surface thereof. The film 30 is adhered to the holder 10 and the elastic dome 20 to form the elastic dome 20. ) Is fixed to the holder 10, and the liquid such as water is blocked from flowing into the hollow part 11.

To this end, the film 30 is attached to the holder 10, the outer side is attached to the first film 31, the protrusion 21 is formed extending in the direction of the mounting portion 22 in the horizontal direction. It is attached to the third film 33 and the mounting portion 22 forming a curved surface, the lower portion is connected to the first film 31, the upper portion is connected to the third film 33, the width from the lower portion to the upper portion The second film 32 is formed narrower.

The first film 31 has an outer side attached to the holder 10, while an inner side thereof is positioned between the holder 10 and the mounting portion 22, and the holder 10 and the mounting portion 22. Block the space formed between.

In addition, the first film 31 is located in the empty space between the holder 10 and the mounting portion 22 and flows together with the elastic dome 20 when the protrusion 21 is pressed to the elastic dome ( Inverting operation of 20) can be easily performed.

The second film 32 has a shape corresponding to that of the mounting part 22, and gently connects the first film 31 and the third film 33.

The third film 33 is attached to the protrusion 21 forming the elastic dome 20 so that the elastic dome 20 is stably fixed to the holder 10.

The film 30 is made of the first film 31, the second film 32 and the third film 33 in the same plane state, the holder 10 and the elastic dome 20 While attached, the shape shown in FIGS. 1 to 3 may be achieved. Alternatively, before the film 30 is attached to the holder 10 and the elastic dome 20, the first film 31, the second film 32, and the third film 33 are shown in FIG. 1. It may also form the form shown in FIG.

The outer periphery of the film 30 is formed in the same shape as the outer periphery of the holder 10, the outer diameter is preferably formed smaller than the outer diameter of the holder (10). This, when soldering the outer periphery of the holder 10, the outside of the film 30 protrudes outward than the holder 10 to block the obstacles that may occur due to the soldering operation can be made easily On the other hand, it is to prevent a failure or the like that may occur due to the lead buried in the film (30).

4 and 5 is a perspective view showing another example of the holder in the dome switch according to the present invention and a state diagram showing the use of the packaging state, Figure 6 is a longitudinal sectional view showing a mounting space in the present invention, Figure 7 and 8 is a plan view and a perspective view showing another example of the fence unit in the present invention.

4 to 8, the holder 10 may be provided with a fence portion 13 extending upwardly on an outer circumferential surface thereof.

The dome switch 1 is packaged by the packaging cover 200 in a state where a plurality of the dome switch 1 is arranged in a horizontal and vertical direction, and in use, the dome switch 1 from the packaged cover 200 which is packaged. Pick up and use.

The fence part 13 is the packaging cover 200 is the dome of the dome switch 1 due to the residue 35 of the adhesive layer 34 remaining on the edge of the film 30 when the product of the dome switch 1 packaging Do not stick to switch (1).

In other words, the fence part 13 is spaced apart from the edge formed by the film 30 and the packaging cover 200 so as not to be in contact with each other, as shown in FIG. 5, remaining on the edge of the film 30. Residue 35 prevents the packing cover 200 from sticking to the dome switch 1.

The fence portion 13 may be formed of a guide ring 14 extending upwardly from the outer circumferential surface of the holder 10, the guide ring 14 is bent in the upper direction of the holder 10 Alternatively, it is preferable to be integrally formed with the holder 10 while being bent.

The dome switch 1 is formed so that the guide ring 14 is extended upward from the outside of the holder 10 so that the film 30 can be stably seated inside the guide ring 14. can do. This is because the guide ring 14 is formed to protrude upward along the circumference of the holder 10, the film 30 can be seated in a predetermined position without deviating out of the guide ring 14 Can be understood.

In addition, the dome switch 1 when the product packaging, the packaging ring 200 and the film (the guide ring 14 supports the packaging cover 200 upward from the edge of the film 30) The edges formed by 30 may be spaced apart from each other. As a result, the dome switch 1 may prevent the packing cover 200 from contacting the residue 35 remaining at the edge of the film 30.

As shown in FIG. 6, the guide ring 14 may have a lower outer side rounded to form a mounting space 40 between the guide ring 14 and the printed circuit board 100. Here, the lower outer side of the guide ring 14 may be understood as a corner portion formed by the outer circumferential surface of the guide ring 14 and the lower surface of the holder 10 are in contact with each other, the corner portion is rounded to the mounting space ( 40).

This is because the application area of the solder can be increased when the surface of the dome switch 1 is mounted on the printed circuit board 100.

That is, the dome switch 1 is fixedly installed on the printed circuit board 100 by soldering the entire lower circumference of the guide ring 14, the application area of the solder is increased by the mounting space 40. This is because the rigidity of the solder can be expected.

Alternatively, the fence portion 13 may have a plurality of guide protrusions 15 extending upward from the outside of the holder 10 with respect to the center of the holder 10 as shown in FIGS. 7 and 8. It may be made of.

The plurality of guide protrusions 15 may be bent or bent upward from the outer side of the holder 10 to be integrally formed with the holder 10, and the lower outer side may be rounded to form the printed circuit board 100. Of course, the mounting space 40 may be formed between and.

As shown in FIG. 7, the plurality of guide protrusions 15 may protrude outward from the outer circumferential surface of the holder 10 or may be located inward from the outer circumferential surface of the holder 10.

For example, the holder 10 has a plurality of guide grooves 16 that are depressed inwardly to the outer peripheral surface around the central portion, as formed as the plurality of guide projections 15 shown in Figure 8 wherein the plurality each It may be formed by bending or bending upward from the inner circumferential surface of the guide groove 16 of the.

Here, the plurality of guide grooves 16 allow the plurality of guide protrusions 15 to be easily bent or bent upwards, and the dome switch 1 on the printed circuit board 100. It can be understood to allow the area of application of the solder to be increased during surface mounting.

The dome switch 1 configured as described above may not be in contact with the edge of the film 30 and the packaging cover 200 by the fence part 13 during product packaging.

As a result, the dome switch 1 may cause the dome switch 1 to adhere to the product while the packing cover 200 contacts the residue 35 of the adhesive layer 34 remaining on the edge of the film 30 when the product is packaged. You can prevent it.

Referring to Figure 9, the dome switch manufacturing method according to the present invention, Holder and elastic dome press processing step (S1), the holder and the elastic dome press processing step (S1) to manufacture the holder 10 and the elastic dome 20 by press working and the holder It comprises a film bonding step (S2) for bonding the elastic dome 20 to the film (30).

Here, it is preferable that a raw material is understood by metal plates, such as a metal.

Because of this, As shown in FIG. 9, the dome switch 1 is formed of a metal metal or the like. Holder and elastic dome press processing step (S1) for manufacturing the holder 10 and the elastic dome 20 by press working, the holder 10 and the holder and elastic dome press processing step (S1) and Since the elastic dome 20 can be manufactured only by the film bonding step S2 for adhering the film 30, productivity can be improved and cost can be reduced due to the simplification of the manufacturing process.

In addition, since the holder 10 is located between the printed circuit board 100 and the elastic dome 20 only, and the holder 10 can be manufactured in a thin form by pressing. It is possible to manufacture ultra thin overall.

In addition, even if a plurality of the dome switch 1 is mounted on the printed circuit board 100, the film 30 is attached to each dome switch 1, so that it is easy to repair and replace.

1 to 9, the dome switch of the present invention will be described in detail with respect to the process of installing the printed circuit board. The dome switch 1 has the elastic dome 20 according to the pressing of the protrusion 21. It is mounted on the annular step 12 so that it can be drawn into the hollow portion (11).

When the elastic dome 20 is mounted on the annular step 12, the film 30 is attached to the upper portion of the elastic dome 20 so that the elastic dome 20 is stably positioned without being separated from the holder 10. Here, the coupling order of the holder 10, the elastic dome 20 and the film 30 is not limited to the above, and may be combined in a different form order.

When the dome switch 1 configured as described above is mounted on the printed circuit board 100, the holder 10 and the fixed contact point 110 are in contact with each other, and the switch contact point is disposed below the elastic dome 20. Since the entire outer circumference of the holder 10 is soldered to the fixed contact point 110 in a state where 120 is located, liquid such as water is prevented from flowing from the outside to the inside.

In addition, when the dome switch 1 presses the protrusion 21 downwardly, the protrusion 21 is drawn into the hollow part 11 by the applied pressure, and the dome switch 1 contacts the switch contact point 120. It is in an ON state.

On the contrary, when the pressure applied to the protruding portion 21 disappears, the elastic dome 20 is spaced apart from the switch contact point 120 while the protruding portion 21 returns to the win state and becomes an OFF state.

For this reason, the dome switch 1 may obtain a switch signal through the inversion operation of the elastic dome 20.

In addition, the dome switch 1 is the edge of the film 30 remaining on the edge of the film (30) without the edge of the film 30 and the packaging cover 200 by the fence unit 13 during product packaging The residue 35 of the adhesive layer 34 may be in contact with the packaging cover 200 to prevent a phenomenon of sticking to the product.

What has been described above is merely an embodiment for implementing the dome switch and its manufacturing method according to the present invention, the present invention is not limited to the above-described embodiment, the subject matter of the present invention as claimed in the following claims Without departing from the technical spirit of the present invention to the extent that any person of ordinary skill in the art to which the present invention pertains various modifications can be made.

[Description of the code]

* Description of the symbols for the main parts of the drawings *

1: dome switch 10: holder

11 hollow part 12 annular step

13: fence portion 14: guide ring

15: guide protrusion 16: guide groove

20: elastic dome 21: protrusion

22: mounting portion 30: film

31: first film 32: second film

33: third film 34: adhesive layer

35 residue 100 printed circuit board

110: fixed contact point 120: switch contact point

200: packaging cover

Claims

A dome switch mounted on a surface of a printed circuit board having a fixed contact point and a switch contact located inside the fixed contact point and packaged by a separate packaging cover,

A hollow portion provided with a ring-shaped holder connected to the fixed contact point;

An elastic dome mounted on the holder and having a protrusion protruding upward; And

Located on the upper portion of the elastic dome connecting the holder and the elastic dome, including a film for sealing the hollow portion of the holder,

The elastic dome,

The dome switch, characterized in that the contact with the switch contact or release contact according to the pressing or releasing the pressure.
According to claim 1,

The dome switch, characterized in that the holder is formed in a circular or polygonal.
The method of claim 1,

The holder,

The fence portion is formed extending in the upper direction on the outer peripheral surface,

The fence unit,

The dome switch characterized in that the packaging cover is separated from the edge of the film so as not to contact with each other, while guiding the film seated on the holder.
The method of claim 3, wherein

The fence unit,

And a guide ring or a plurality of guide protrusions extending upward from an outer circumferential surface of the holder.
The method of claim 2,

The holder,

An annular step is formed on the inner circumference

The elastic dome,

A lower part is mounted on the annular step, and the upper part further comprises a mounting portion connected to the protrusion.
The method of claim 5,

The holder,

A plurality of guide grooves are formed on the outer peripheral surface inwardly,

The plurality of guide protrusions,

And a dome switch extending upward from an inner surface constituting the plurality of guide grooves, respectively.
The method of claim 1,

The holder,

The entire outer circumference of the dome switch is fixed to the printed circuit board by soldering.
A manufacturing method for manufacturing the dome switch of any one of claims 1 to 7,

A holder and an elastic dome press processing step of manufacturing the holder and the elastic dome by pressing a material; And

And a film bonding step of adhering the holder and the elastic dome manufactured by the holder and the elastic dome press processing step to the film.