TWM638110U - Pushbottom switch - Google Patents

Abstract

A button switch, comprising an insulating body with a receiving space, a conductive terminal held on the insulating body, a dome-shaped metal conductive sheet fixed on the insulating body and located above the conductive terminal, and a dome-shaped metal conductive sheet located above the metal conductive sheet A dust-proof sheet fixed with the insulating body, the insulating body includes a bottom wall and a peripheral wall protruding upward from the bottom wall to form the accommodation space with the bottom wall, the bottom wall has an exposed On the upper surface of the accommodating space and the lower surface below the accommodating space, the conductive terminal includes a contact portion protruding upward from the upper surface, and the push button switch also includes a sealing part attached to the lower surface A sealing layer for the gap between the holding part and the insulating body. A layer of sealing layer is pasted on the lower surface of the bottom wall of the accommodation space of the insulating body to prevent solder paste welded with the circuit board from entering the accommodation space from below the insulating body.

Description

power switch button

The present invention relates to a push button switch, in particular to a push button switch which prevents the solder paste welded with the external circuit board under the insulating body from entering the receiving space.

China Mainland Invention Patent Application No. CN101364492A discloses a button switch, which includes an insulating body with a receiving space, a fixed terminal fixed to the insulating body and having a contact portion exposed in the receiving space, and a button that contacts the fixed terminal after being pressed. The metal sheet accommodated in the accommodating space and the dust-proof sheet fixed on the upper end surface of the insulating body to block the accommodating space. Of course, the product welding leg is flush with the bottom surface of the insulating body, so as to facilitate the welding board. After the product is assembled, the inner cavity of the insulating body forms a sealed space. During the SMT process of the product, the internal air is heated and expanded, and is discharged from the gap between the conductive terminal and the insulating body. After the highest temperature of SMT, the internal temperature of the product begins to drop. , the internal pressure begins to drop. When the internal pressure is lower than the external atmospheric pressure, gas is sucked in from the gap between the conductive terminal and the insulating body to form a balance. At this time, the bottom surface of the insulating body has been covered with solder, blocking the air intake. The gap, the temperature of the solder has not completely disappeared, the fluidity is very good, and the strong air pressure difference will lead the solder to the space inside the insulating body to achieve balance.

Therefore, it is necessary to improve the existing push button switch to overcome this defect.

The purpose of the present invention is to provide a push button switch with a sealing layer attached under the receiving space of the insulating body to prevent solder paste from entering the receiving space from the bottom of the insulating body.

The purpose of this new model is achieved by the following technical solutions: a push button switch, including an insulating body with a receiving space, a conductive terminal held on the insulating body, a dome-shaped dome held on the insulating body and located above the conductive terminal The metal conductive sheet and the dust-proof sheet fixed to the insulating body above the metal conductive sheet, the insulating body includes a bottom wall and protrudes upward from the bottom wall to form the gap between the bottom wall and the bottom wall. The surrounding wall of the receiving space, the bottom wall has an upper surface exposed in the receiving space and a lower surface located below the receiving space, the conductive terminal includes a contact portion protruding upward from the upper surface, and is held on the insulating The holding part of the body and the welding part exposing the insulating body, the button switch also includes a sealing layer attached to the lower surface to seal the gap between the holding part and the insulating body.

Further, the sealing layer is glue, and is arranged on the lower surface to form a thin film.

Further, the sealing layer is a PI film.

Further, the conductive terminal includes a central terminal and a side terminal located beside the central terminal, and the metal conductive sheet has a central portion located above the central terminal and not in contact with the contact portion of the central terminal under normal conditions. and a peripheral portion located on the peripheral edge of the central portion that is in contact with the contact portion of the side terminal in a normal state.

Further, a pair of side terminals are provided and are respectively located on two sides of the central terminal.

Further, the bottom wall is provided with a joint portion where the conductive terminal and the insulating body are fixed, and the sealing layer is located at the joint portion.

Further, the bottom wall is provided with a terminal receiving groove for receiving the conductive terminal, a plurality of process holes are arranged at the bottom of the receiving groove, and the sealing layer is located in the receiving groove to seal the process holes.

Further, the dust-proof sheet is also provided with a vent hole penetrating with the receiving space.

Further, the lower surface is recessed to form a plurality of grooves, the welding part is accommodated in the grooves and welded with an external circuit board, and the sealing layer gives way to the welding part.

Further, the groove is located on the periphery of the bottom wall, the insulating body has a rectangular structure, and the grooves are located on four corners of the insulating body.

Compared with the prior art, the present invention has the following beneficial effects: a layer of sealing layer 5 is attached to the lower surface corresponding to the receiving groove 1113 of the insulating body 1 to accommodate the conductive terminals, so that the joint between the conductive terminals and the insulating body is in contact with the bottom. The process hole provided on the wall is sealed, and the solder paste for welding under the insulating body will not be absorbed into the receiving space, thereby ensuring the performance of the push button switch.

100: button switch

1: Insulation body

10: Containment Space

11: bottom wall

111: upper surface

1111: junction

1112: depression

1113: Terminal storage slot

1114: process hole

112: lower surface

1121: Groove

12: Weekly wall

13: First side

14: Second side

15: Third side

16: Fourth side

2: Conductive terminal

201: contact part

202: holding part

203: welding part

21: Central terminal

211: first contact part

2111: front end

212: The first fixed part

2121: The first bending part

213: The first welding part

2131: Second bending part

22: side terminal

221: second contact part

2211: rectangular part

222: The second fixed part

2221: The third bending part

223: Second welding part

2231: The fourth bending part

3: Metal conductive sheet

31: central part

32: Peripheral part

4: Dust-proof sheet

41: Pressing part

5:Sealing layer

The first figure is a perspective view of the novel push button switch.

The second figure is a perspective view from another perspective of the first figure.

The third figure is a three-dimensional exploded view of the novel push button switch.

The fourth figure is a further three-dimensional exploded view of the button switch in the third figure.

The fifth figure is a three-dimensional exploded view from another perspective of the fourth figure.

The sixth figure is a sectional view along line VI-VI in the first figure.

Please refer to FIG. 1 to FIG. 6 , the button switch 100 of the present invention is mounted on an external circuit board.

The push button switch 100 includes an insulating body 1 with a receiving space 10, a conductive terminal 2 held on the insulating body 1, and a dome-shaped metal conductive sheet 3 fixed on the insulating body 1 and located above the conductive terminal 2. And the dust-proof sheet 4 above the metal conductive sheet 3 and fixed to the insulating body 1 , and the sealing layer 5 attached below the receiving space 10 and in contact with the external circuit board.

The insulating body 1 includes a bottom wall 11 and a peripheral wall 12 protruding upward from the bottom wall 11 . The bottom wall 11 and the peripheral wall 12 form the receiving space 10 . The insulating body 1 is provided with a first side The side 13 , the second side 14 opposite to the first side 13 , and the third side 15 and the fourth side 16 connecting the first side 13 and the second side 14 . The bottom wall 11 has an upper surface 111 exposed to the receiving space 10 and a lower surface 112 below which contacts the external circuit board. The upper surface 111 includes a plurality of joint portions 1111 where the insulating body 1 is combined with the conductive terminals 2, a terminal receiving groove 1113 for accommodating the conductive terminals 2, and a third side 15 and The concave portion 1112 of the fourth side 16 . The terminal receiving groove 1113 defines a process hole 1114 passing through the upper surface 111 and the lower surface 112 . The lower surface 112 is concavely formed with a plurality of grooves 1121 . The groove 1121 is located on the edge of the bottom wall 11 . The accommodating space 10 is substantially circular, and the bottom wall 11 is provided with the recessed portion 1112 protruding from the circular range for accommodating the contact portion 201 of the conductive terminal 2 .

The conductive terminal 2 is accommodated in the receiving space 10 and is in contact with the metal conductive sheet 3 under normal conditions. The conductive terminal 2 includes a plurality of contact parts 201 , a holding part 202 fixed on the insulating body 1 , and a welding part 203 protruding from the bottom of the insulating body 1 and located in the groove 1121 . The conductive terminal 2 includes a central terminal 21 held on the first side 13 and extending toward the second side 14, and a central terminal 21 held on the second side 14 and extending toward the first side 13. side terminal 22. The side terminals 22 are located on two sides of the central terminal 21 . The central terminal 21 includes a circular first contact portion 211, a pair of first welding portions 213 extending from the outer surface of the peripheral wall 12 and accommodated in the groove 1121, and connecting the first contact portion 211 and The first welding portion 213 is embedded in the first fixing portion 212 of the insulating housing 1 . The first contact portion 211 includes a front end portion 2111 extending from the front end of the first contact portion 211 from the first side 13 to the second side 14 . The front end portion 2111 is embedded in the bottom wall 11 . The combining portion 1111 is disposed at the front end portion 2111 . A first bent portion 2121 obliquely disposed and embedded in the bottom wall 11 is disposed between the first fixing portion 212 and the first welding portion 213 . The first welding portion 213 extends from the upper surface 111 to the lower surface 112 and is embedded in the second bent portion 2131 of the bottom wall 11 . The combining portion 1111 is also located at the first bending portion 2121 and the second bending portion 2131 .

The side terminal 22 includes a second contact portion 221 opposite to the recessed portion 1112 disposed on the third side 15 and the fourth side 16 , and a pair of housings extending from the outer surface of the peripheral wall 12 . The second welding portion 223 in the groove 1121 and the second fixing portion 222 embedded in the insulating housing 1 connecting the second contact portion 221 and the second welding portion 223 . The second contact portion 221 protrudes from the rectangular portion 2211 accommodated in the concave portion 1112 . A third bent portion 2221 obliquely disposed and embedded in the bottom wall 11 is disposed between the second fixing portion 222 and the second welding portion 223 . The second welding portion 223 extends from the upper surface 111 to the lower surface 112 and is embedded in the fourth bent portion 2231 of the bottom wall 11 . The combining portion 1111 is also located at the third bending portion 2221 and the fourth bending portion 2231 .

The first contact portion 211 and the second contact portion 221 are collectively referred to as the contact portion 201, the first fixing portion 212 and the second fixing portion 222 are collectively referred to as the holding portion 202, and the first welding portion 213 and The second welding portion 223 is collectively referred to as a welding portion.

The metal conductive sheet 3 has an inner diameter equivalent to the receiving space 10 , is located above the receiving space 10 , and has a central portion 31 and a peripheral portion 32 located around the central portion 31 . The central portion 31 is not in contact with the contact portion 201 of the central terminal 21 under normal conditions, and when the central portion 31 is pressed, the central portion 31 is in contact with the contact portion 201 of the central terminal 21 . The peripheral portion 32 is in normal contact with the contact portion 201 of the side terminal 22 . Specifically, in the present invention, the central portion 31 is in constant contact with the second contact portion 221 . The metal conductive sheet 3 is installed in the receiving space 10 from top to bottom and located above the conductive terminal 2 , and the metal conductive sheet 3 is pressed down to contact the first contact portion 211 .

The dust-proof sheet 4 is covered above the receiving space 10 and is located above the metal conductive sheet 3. In this embodiment, the dust-proof sheet 4 is kept in contact with the central part 31 under normal conditions. In the embodiment, the dust-proof sheet 4 does not keep in contact with the central portion 31 under normal conditions.

After the button switch product is assembled, the inner cavity of the insulating body 1 forms a sealed space. During the SMT process of the product, the internal air is heated and expanded, and is discharged from the gap between the conductive terminal 2 and the insulating body 1. After the highest temperature of SMT, the internal temperature of the product begins to drop, and the internal pressure begins to drop. When the internal pressure is lower than the external atmospheric pressure, gas is sucked in from the gap between the conductive terminal 2 and the insulating body 1 to form an equilibrium. At this time, the insulating body The bottom surface of 1 has been covered with solder, which blocks the air intake gap. The temperature of the solder has not completely disappeared, and the fluidity is very good. The strong air pressure difference will drain the solder into the space inside the insulating body to achieve balance. In order to prevent solder from entering the receiving space 10 and affecting the performance of the product, in the present model, when the push button switch 100 is produced, a layer of sealing layer 5 is attached to the lower surface 112 after the conductive terminal 2 and the insulating body 1 are assembled. Prevent solder from being sucked into the receiving space 10 from the process hole 1114 or the joint portion 1111 . The sealing layer 5 gives way to the welding portion 203, and the welding portion 203 is accommodated in the groove 1121. In this embodiment, the insulating body 1 is rectangular, and the groove 1121 is located in the groove 1121. On the four corners of the insulating body 1 , the sealing layer 5 is not provided with shields at positions corresponding to the four corners of the insulating body 1 , so that the soldering portion 203 is in better contact with the circuit board.

The push button switch 100 further includes a sealing layer 5 located on the lower surface 112 of the receiving space 10 . The sealing layer 5 is glue, and forms a thin film on the lower surface 112. In other embodiments, the sealing layer 5 is a PI film. Specifically, the sealing layer 5 is located at the joint portion 1111 , further, the sealing layer 5 is located at the terminal receiving groove 1113 to seal the process hole 1114 . In the present invention, the sealing layer 5 is a one-piece structure attached to the lower surface 112 .

In order to solve the above-mentioned problem of air pressure balance, vent holes can also be provided on the dust-proof sheet 4 to release the pressure to meet the air pressure balance inside and outside the sealed space when the air pressure in the sealed space of the insulating body 1 is unbalanced. The dust-proof sheet 4 is provided with a pair of ventilation holes, and the pair of ventilation holes are located on opposite sides of the insulating body 1 . Since the metal conductive sheet 3 is located above the substantially circular range of the accommodating space 10, in other embodiments of the present invention, the vent hole is located outside the metal conductive sheet 3, specifically, the The vent hole is located above the recessed portion 1112 , so that the air pressure in the sealed space where the receiving space 10 is located can better come out from the vent hole and achieve consistent internal and external pressure.

The new button switch is provided with the sealing layer 5 on the lower surface of the bottom wall 11 of the insulating body 1, and the sealing layer 5 gives way to the welding part 203 so that the welding part 203 and the The circuit board is soldered without causing the solder to be sucked into the receiving space from the process hole 1114 or the joint portion 1111 , which will affect the function of the push button switch 100 .

It should be pointed out that the above description is only the best implementation mode of the present invention, not all the implementation forms. Any equivalent changes to the technical solution of the present invention adopted by those of ordinary skill in the art by reading the description of the present invention are all equivalent changes of the present invention. covered by the requested item.

100: button switch

1: Insulation body

10: Containment Space

2: Conductive terminal

3: Metal conductive sheet

31: central part

4: Dust-proof sheet

5:Sealing layer

Claims (10)

A button switch, comprising an insulating body with a receiving space, a conductive terminal held on the insulating body, a dome-shaped metal conductive sheet fixed on the insulating body and located above the conductive terminal, and a dome-shaped metal conductive sheet located above the metal conductive sheet A dust-proof sheet fixed with the insulating body, the insulating body includes a bottom wall and a peripheral wall protruding upward from the bottom wall to form the accommodation space with the bottom wall, the bottom wall has an exposed On the upper surface of the accommodating space and the lower surface below the accommodating space, the conductive terminal includes a contact portion protruding upward from the upper surface, a holding portion fixed to the insulating body, and a portion exposing the insulating body. The welding part, wherein the push button switch further includes a sealing layer attached to the lower surface to seal the gap between the holding part and the insulating body. The button switch according to claim 1, wherein the sealing layer is glue, and is arranged on the lower surface to form a thin film. The push button switch according to claim 2, wherein the sealing layer is a PI film. The push button switch according to claim 1, wherein the conductive terminals include a central terminal and a side terminal located beside the central terminal, and the metal conductive sheet has a normal position above the central terminal and the A central portion where the contact portion of the central terminal does not contact, and a peripheral portion located at the peripheral edge of the central portion that is in contact with the contact portion of the side terminal in a normal state. The button switch according to claim 4, wherein a pair of side terminals are provided and are respectively located on two sides of the central terminal. The push button switch according to claim 1, wherein the bottom wall is provided with a joint portion where the conductive terminal and the insulating body are held, and the sealing layer is located at the joint portion. The button switch according to claim 6, wherein, the bottom wall is provided with a terminal receiving groove for receiving the conductive terminal, a plurality of process holes are arranged at the bottom of the receiving groove, and the sealing layer is located in the receiving groove to seal The process hole. The push button switch according to claim 1, wherein the dust-proof sheet is further provided with a vent hole penetrating the receiving space. The push button switch according to claim 3, wherein the lower surface is recessed to form a plurality of grooves, the welding part is accommodated in the grooves and welded with an external circuit board, and the sealing layer gives way to the The welding part. The button switch according to claim 9, wherein the groove is located at the periphery of the bottom wall, the insulating body has a rectangular structure, and the grooves are located at four corners of the insulating body.

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