CN214012798U

CN214012798U - Waterproof membrane switch

Info

Publication number: CN214012798U
Application number: CN202120253446.0U
Authority: CN
Inventors: 胡秀龙
Original assignee: Dongguan Xinkun Electronic Technology Co ltd
Current assignee: Dongguan Xinkun Electronic Technology Co ltd
Priority date: 2021-01-28
Filing date: 2021-01-28
Publication date: 2021-08-20
Anticipated expiration: 2031-01-28

Abstract

The utility model discloses a waterproof type membrane switch, through setting up flush mounting plate of switch and conduction band external member, when waterproof type membrane switch was let in for a long time and is greater than rated current, the electrically conductive fuse link in the fuse wall can constantly generate heat under this electric current, namely electrically conductive fuse link is heated and is heated up, when the temperature of electrically conductive fuse link is greater than a definite value, electrically conductive fuse link can be fusing the fuse wall, and then prevent waterproof type membrane switch to continue work under this electric current, accomplish the automatic protection of cutting off, prevent that too big electric current from letting waterproof type membrane switch damage; in addition, as the elastic anti-pulling buckle is provided with the clamping convex top and is in a V-shaped structure, when the FPC belt is inserted into an external device, the plugging piece can be deformed and inserted into the external device, so that the clamping convex top is clamped in a clamping groove of the external device, the FPC belt is not easy to pull out under the action of external force, and the connection stability with the external device is ensured; moreover, the waterproof layer can greatly enhance the waterproof performance of the membrane switch.

Description

Waterproof membrane switch

Technical Field

The utility model relates to a membrane switch field especially relates to a waterproof type membrane switch.

Background

At present, a membrane switch is an operating system integrating a key function, an indicating element and an instrument panel. The circuit board consists of four parts, including a panel, an upper circuit, an isolating layer and a lower circuit. When the membrane switch is pressed down, the contact of the upper circuit deforms downwards to be in contact with the polar plate of the lower circuit for conduction, after the finger is loosened, the contact of the upper circuit rebounds, the circuit is disconnected, and the loop triggers a signal. The membrane switch has the advantages of rigorous structure, attractive appearance and good sealing property. Has the characteristics of moisture resistance, long service life and the like. The method is widely applied to the fields of electronic communication and electronic measurement instruments, industrial control, medical equipment, automobile industry, intelligent toys, household appliances and the like. The types of the membrane switches are various, and there are a matrix type membrane switch, a backlight type membrane switch and a waterproof type membrane switch, but the membrane switch functions to output a signal regardless of the type of the membrane switch. The membrane switch is a new type electronic component integrating light collection, machine and electricity, which can seal key switch, panel, mark, symbol display and lining board together, and can replace the key of conventional discrete component to execute the task of operating system more reliably.

For the existing membrane switch, the following structural defects exist:

firstly, a membrane switch is used as a small-sized electronic device and can work by depending on current driving, when the current led into the membrane switch is larger than the rated current of the membrane switch, if the membrane switch works under the overlarge current for a long time and no related personnel find that the membrane switch can work under the current all the time, the probability that the membrane switch is burnt is greatly improved by the overlarge current, and the normal work of the membrane switch is seriously influenced;

secondly, the membrane switch is connected with an external device through the FPC belt, and signals generated by the membrane switch are input into the external device, and most of the FPC belts on the membrane switches are not provided with an anti-pulling structure, so that the FPC belts are very easy to pull out from the external device under the action of external force, and the signal output of the membrane switch is influenced;

thirdly, the existing membrane switch has poor waterproof performance, and once the conductive liquid such as water drops flows into the membrane switch, the membrane switch is easy to cause short circuit, so that the membrane switch cannot work normally.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming the weak point among the prior art, providing one kind and let in for a long time and be greater than the rated current when can cut off the protection by oneself, prevent that too big electric current from letting it damage, be provided with and prevent pulling out the waterproof type membrane switch that the structure is strong with external device connection stability.

The purpose of the utility model is realized through the following technical scheme:

a membrane switch of the waterproof type comprising:

the switch panel comprises a panel layer, an upper circuit layer, an isolation layer, a lower circuit layer, a waterproof layer and a plurality of elastic keycaps, wherein the panel layer, the upper circuit layer, the isolation layer, the lower circuit layer and the waterproof layer are sequentially stacked, conductive circuits are etched in the upper circuit layer and the lower circuit layer, and the elastic keycaps are arranged on the panel layer; and

conduction band external member, the conduction band external member includes FPC area, fuse link to and a plurality of plug spare, the one end in FPC area with the circuit layer is connected down, the square hole has been seted up to one of FPC area, the square hole is so that FPC takes all to form the fuse wall, two on the both sides position department of one end the cavity has all been seted up in the fuse wall, the fuse link is to including two electrically conductive fuse links, two electrically conductive fuse link one-to-one sets up in two in the cavity, each plug spare all includes the piece body and elasticity prevents pulling out the knot, the piece body set up in on the other end in FPC area, elasticity prevent pulling out the one end of knot with piece body coupling, elasticity prevents pulling out and is provided with the joint crest, the joint crest is toward keeping away from the direction protrusion of the piece body, so that elasticity prevents pulling out the knot and is "V" style of calligraphy structure.

In one embodiment, the fusing wall is provided with an overhead inner cavity at two sides close to the inner cavity.

In one embodiment, the inner cavity is provided with drainage grooves on two side walls, and the two drainage grooves are communicated with the two overhead inner cavities in a one-to-one correspondence manner.

In one embodiment, the plug-in component further comprises a reinforcing rib, one end of the reinforcing rib is connected with the elastic anti-pulling buckle, and the other end of the reinforcing rib is connected with the component body.

In one embodiment, the body, the elastic pull-out preventing fastener and the reinforcing rib are integrally formed.

In one embodiment, the fuse wall has a width in a range of 2cm to 2.5 cm.

In one embodiment, the waterproof membrane switch further comprises a display screen, through holes are formed in the upper circuit layer, the isolation layer and the lower circuit layer, the display screen is arranged on the panel layer, and the panel layer is connected with the upper circuit layer and the lower circuit layer respectively.

In one embodiment, the display screen is an LED display screen.

Compared with the prior art, the utility model discloses advantage and beneficial effect below having at least:

the utility model discloses a waterproof type membrane switch, through setting up flush mounting plate of switch and conduction band external member, when waterproof type membrane switch was let in for a long time and is greater than rated current, the electrically conductive fuse link in the fuse wall can constantly generate heat under this electric current, namely electrically conductive fuse link is heated and is heated up, when the temperature of electrically conductive fuse link is greater than a definite value, electrically conductive fuse link can be fusing the fuse wall, and then prevent waterproof type membrane switch to continue work under this electric current, accomplish the automatic protection of cutting off, prevent that too big electric current from letting waterproof type membrane switch damage; in addition, as the elastic anti-pulling buckle is provided with the clamping convex top and is in a V-shaped structure, when the FPC belt is inserted into an external device, the plugging piece can be deformed and inserted into the external device, so that the clamping convex top is clamped in a clamping groove of the external device, the FPC belt is not easy to pull out under the action of external force, and the connection stability with the external device is ensured; moreover, the waterproof layer can greatly enhance the waterproof performance of the membrane switch, and the damage of short circuit caused by the fact that water drops flow into the membrane switch is prevented.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural view of a waterproof membrane switch according to an embodiment of the present invention;

fig. 2 is a schematic view of an internal structure of an FPC tape according to an embodiment of the present invention;

FIG. 3 is an enlarged schematic view of FIG. 1 at A;

fig. 4 is a schematic structural diagram of a plug member according to an embodiment of the present invention.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1, a waterproof membrane switch 10 includes a switch panel 100 and a conduction band kit 200.

Thus, it should be noted that the switch panel 100 is used for generating signals; the conduction band kit 200 functions to electrically connect with an external device, and can output a signal generated from the switch panel 100 to the external device.

Referring to fig. 1, the switch panel 100 includes a panel layer 110, an upper circuit layer 120, an isolation layer 130, a lower circuit layer 140, a waterproof layer 150, and a plurality of elastic key caps 160, wherein the panel layer 110, the upper circuit layer 120, the isolation layer 130, the lower circuit layer 140, and the waterproof layer 150 are sequentially stacked, conductive traces are etched in the upper circuit layer 120 and the lower circuit layer 140, and each elastic key cap 160 is disposed on the panel layer 110.

Thus, when the waterproof membrane switch 10 needs to generate a signal, the elastic key cap 160 is pressed by a hand to deform the elastic key cap 160, so that the upper circuit layer 120 and the lower circuit layer 140 are in contact with each other, and the waterproof membrane switch 10 can generate a signal; the isolation layer 130 plays an isolation role; the waterproof layer is arranged, so that the waterproof performance of the membrane switch can be greatly enhanced, and the phenomenon that the membrane switch is damaged due to short circuit caused by water drops flowing into the membrane switch is prevented.

Referring to fig. 1, 2, 3 and 4, the tape guide assembly 200 includes an FPC tape 210, a fuse link pair 220 and a plurality of plug members 230, one end of the FPC tape 210 is connected to the lower circuit layer 140, one end of the FPC tape 210 is provided with a square hole 211, the square hole 211 enables the FPC tape 210 to form fuse walls 212 on both sides of the one end, the two fuse walls 212 are respectively provided with an inner cavity 212a, the fuse link pair 220 includes two conductive fuse links 221, the two conductive fuse links 221 are correspondingly arranged in the two inner cavities 212a one by one, each plug member 230 includes a member 231 and an elastic anti-pulling buckle 232, the member 231 is arranged on the other end of the FPC tape 210, one end of the elastic anti-pulling buckle 232 is connected to the member 231, the elastic anti-pulling buckle 232 is provided with a buckling protrusion 232a, and the buckling protrusion 232s protrudes in a direction away from the member 231, so that the elastic anti-pulling buckle 232 is in a V-shaped structure.

Therefore, it should be noted that when the waterproof membrane switch 10 is energized for a long time and is greater than the rated current, the conductive fuse piece 221 in the fuse wall 212 continuously generates heat under the current, that is, the conductive fuse piece 221 is heated to raise the temperature, when the temperature of the conductive fuse piece 221 is greater than a certain value, the conductive fuse piece 221 fuses the fuse wall 212, thereby preventing the waterproof membrane switch 10 from continuously working under the current, completing the self-disconnection protection, and preventing the waterproof membrane switch 10 from being damaged by an excessive current; in addition, because elasticity is prevented pulling out and is provided with joint convex top 232a on detaining 232, and elasticity is prevented pulling out and detains 232 and be "V" style of calligraphy structure, when FPC area 210 inserts external device, plug 230 can be deformed and insert in the external device, lets joint convex top 232a joint in the draw-in groove of external device, and FPC area 210 just is difficult to being extracted in the effect of external force this moment, guarantees the stability of being connected with external device.

Further, referring to fig. 2 again, in one embodiment, the fusing wall 212 is provided with an overhead inner cavity 212b at two sides near the inner cavity 212 a.

In this way, the opening of the overhead cavity 212b can reduce the overall thickness of the fuse wall 212, and the conductive fuse piece 221 can fuse the fuse wall 212 more easily under an excessive current.

Further, referring to fig. 2 again, in one embodiment, drainage grooves 212a-1 are formed on both sidewalls of the inner cavity 212a, and the two drainage grooves 212a-1 are in one-to-one correspondence with the two overhead inner cavities 212 b.

In this way, it should be noted that, due to the drainage groove 212a-1, when the waterproof membrane switch is subjected to an excessive current, heat generated by the conductive fuse 221 can flow into the overhead inner cavity 212b through the drainage groove 212a-1, thereby further improving the fusing efficiency of the conductive fuse 221.

Further, referring to fig. 4 again, in one embodiment, the plug member 230 further includes a rib 233, one end of the rib 233 is connected to the elastic anti-pulling buckle 232, and the other end of the rib 233 is connected to the member body 231.

In this way, the provision of the rib 233 can improve the overall mechanical strength of the plug 230. Specifically, the body 231, the elastic anti-pulling buckle 232 and the reinforcing rib 233 are integrally formed. In this way, the integral structure can further improve the overall mechanical strength of the plug 230.

Further, referring to fig. 2 again, in one embodiment, the width of the fuse wall 212 ranges from 2cm to 2.5 cm.

In this way, the width of the fuse wall 212 is preferably in the range of 2cm to 2.5cm, so that the connection stability between the FPC tape 210 and the lower circuit layer 140 can be ensured, and the fuse wall 212 can be easily fused by the conductive fuse 221.

Further, referring to fig. 1 again, in an embodiment, the waterproof membrane switch 10 further includes a display screen 300, the upper circuit layer 120, the isolation layer 130 and the lower circuit layer 140 are all provided with through holes 160, the display screen 300 is disposed on the panel layer 110, and the panel layer 110 is connected to the upper circuit layer 120 and the lower circuit layer 130 respectively.

In this manner, the display 300 plays a role of displaying to inform the user what kind of signal the waterproof membrane switch 10 outputs. Specifically, the display screen 300 is an LED display screen.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A waterproof membrane switch, comprising:

2. The waterproof membrane switch of claim 1, wherein the fusing wall is provided with an overhead inner cavity at positions close to both sides of the inner cavity.

3. The waterproof membrane switch according to claim 2, wherein the inner cavity is provided with drainage grooves on two side walls, and the two drainage grooves are communicated with the two overhead inner cavities in a one-to-one correspondence manner.

4. The waterproof membrane switch according to claim 1, wherein the plug-in member further comprises a reinforcing rib, one end of the reinforcing rib is connected to the elastic anti-pulling buckle, and the other end of the reinforcing rib is connected to the member body.

5. The waterproof membrane switch of claim 4, wherein the body, the elastic anti-pulling buckle and the reinforcing rib are integrally formed.

6. The waterproof membrane switch of claim 1, wherein the width of the fusing wall ranges from 2cm to 2.5 cm.

7. The waterproof membrane switch of claim 1, further comprising a display screen, wherein the upper circuit layer, the isolation layer and the lower circuit layer are provided with through holes, the display screen is disposed on the panel layer, and the panel layer is connected to the upper circuit layer and the lower circuit layer respectively.

8. The waterproof membrane switch of claim 7, wherein the display screen is an LED display screen.