CN215377281U

CN215377281U - Membrane switch

Info

Publication number: CN215377281U
Application number: CN202121867019.8U
Authority: CN
Inventors: 丁秀琴; 张勰军; 卢俊生; 吴磊; 邱泽安
Original assignee: Kunshan Xingxiehe Technology Co Ltd
Current assignee: Kunshan Xingxiehe Technology Co Ltd
Priority date: 2021-08-11
Filing date: 2021-08-11
Publication date: 2021-12-31
Anticipated expiration: 2031-08-11
Also published as: WO2023015800A1

Abstract

The utility model provides a membrane switch, comprising: the diaphragm is provided with a first through hole, the diaphragm is attached to the upper surface and the lower surface of the diaphragm and is connected with the diaphragm in an adhesive manner, the pressing cavity is formed by the hole wall of the first through hole and the surface on the opposite side of the diaphragm, the electric conductor is positioned in the pressing cavity, the bottom plate is attached to the lower surface of the lower diaphragm and is connected with the lower diaphragm in an adhesive manner, the air passage communicated with the outside is arranged between the bottom plate and the lower diaphragm, a circuit between the upper diaphragm and the lower diaphragm cannot be exposed to the air through the air passage, the diaphragm is durable, the second through hole for communicating the pressing cavity with the air passage is arranged on the lower diaphragm, the second through hole faces the force application direction of the membrane switch, the air exhaust is smoother, the pressing comfort is better, the traveling distance of water vapor is prolonged through the design of the air passage and the second through hole, and when the diaphragm is immersed in water, a water seal can be formed at the outlet communicated with the outside through the air passage, can prevent water from further entering the membrane switch and has a waterproof function.

Description

Membrane switch

Technical Field

The utility model belongs to the technical field of electric switches, and particularly relates to a membrane switch.

Background

The membrane switch is a novel electronic switch, is used for controlling the break-make in its place return circuit, and the wide application is in products such as equipment all kinds of key panel, computer keyboard, and current membrane switch is mostly warp to make through the diaphragm and presses intracavity electric conductor contact each other and realize switching on the function, in order to realize pressing the compression and the resilience in chamber, presses the chamber and can not totally airtight, and how waterproof has just become a problem.

The existing solution is to raise the difficulty of water entering the pressing cavity as much as possible, for example, chinese patent CN207529861U discloses a method of prolonging the travel distance of water vapor by setting an air passage to avoid water vapor entering, but this scheme has at least the following defects:

1. the air channel is arranged on the interlayer between the upper diaphragm and the lower diaphragm, so that a circuit coated on the diaphragms is exposed in the air through the air channel, the circuit is easy to oxidize, poor in contact and the like are easy to occur, and the diaphragm is not durable;

2. the pressing cavity is communicated with the air passage through the slit on the side wall of the pressing cavity, the opening is small, the direction of the slit is perpendicular to the force application direction of the membrane switch, the exhaust smoothness is low, and the pressing comfort is poor.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects of the prior art and provide a membrane switch which is durable in use, smooth in air exhaust, good in pressing comfort and waterproof.

In order to achieve the above object, the present invention adopts a technical solution that a membrane switch includes:

the partition plate extends along the horizontal direction, and a first through hole penetrating through the partition plate along the vertical direction is formed in the partition plate;

the diaphragm is attached to the upper surface and the lower surface of the partition plate and is connected with the partition plate in an adhesion mode, and the diaphragm comprises an upper diaphragm and a lower diaphragm;

the pressing cavity is formed by a cavity defined by the hole wall of the first through hole, the lower surface of the upper diaphragm and the upper surface of the lower diaphragm;

the electric conductor is positioned in the pressing cavity and comprises an upper electric conductor arranged on the lower surface of the upper diaphragm and a lower electric conductor arranged on the upper surface of the lower diaphragm;

the membrane switch further comprises a bottom plate which is attached to the lower surface of the lower membrane and is connected with the lower membrane in a bonding mode, an air passage communicated with the outside is formed between the bottom plate and the lower membrane, and a second through hole used for communicating the pressing cavity and the air passage is formed in the lower membrane.

Preferably, the airway includes a main airway and a branch airway, the main airway is communicated with the outside, one end of the branch airway is communicated with the main airway, and the other end of the branch airway is communicated with the pressing cavity through the second through hole.

Further preferably, there are a plurality of the pressing chambers, a plurality of the branch airway passages are provided, and the plurality of the branch airway passages and the plurality of the pressing chambers are provided in one-to-one correspondence.

Further preferably, the main airway is formed by the convergence of the ends of all the branch airways far away from the pressing cavity.

Preferably, the axis of the second through hole is parallel to the axis of the first through hole.

Further preferably, a distance between the second through hole axis and the first through hole axis is smaller than or equal to a radius difference between the first through hole and the second through hole.

Preferably, a waterproof and breathable film is arranged in the air passage.

Further preferably, the waterproof and breathable membrane is positioned at the end of the air passage far away from the pressing cavity.

Preferably, the outer wall of the upper conductor is wrapped with an upper isolation layer, the upper isolation layer is formed by sintering a carbon paste layer printed on the outer wall of the upper conductor, the outer wall of the lower conductor is wrapped with a lower isolation layer, and the lower isolation layer is formed by sintering a carbon paste layer printed on the outer wall of the lower conductor.

Further preferably, the air channel is formed by a spacing groove of a glue layer between the bottom plate and the lower membrane.

Due to the application of the technical scheme, compared with the prior art, the utility model has the following advantages:

1. the bottom plate is attached to the lower surface of the lower diaphragm and is in adhesive connection with the lower diaphragm, the air passage communicated with the outside is arranged between the bottom plate and the lower diaphragm, a circuit between the upper diaphragm and the lower diaphragm cannot be exposed to the air through the air passage, and the circuit between the diaphragms can be isolated through the adhesive connection between the diaphragms and the partition plate, so that the membrane switch can be durable;

2. the lower diaphragm is provided with the second through hole for communicating the pressing cavity with the air passage, and the second through hole faces to the force application direction of the membrane switch, so that the membrane switch is more smooth in air exhaust and better in pressing comfort;

3. through the design of air flue, second through-hole, prolonged the distance of marcing of steam, because the existence of air flue, when soaking in water, can form the water seal in the exit of air flue and external intercommunication, can avoid water further to get into membrane switch, have waterproof function.

Drawings

Fig. 1 is a schematic top view of a first embodiment of the present invention.

Fig. 2 is a schematic sectional view in the direction of a-a in fig. 1.

Fig. 3 is a schematic top view of a second embodiment of the present invention.

Fig. 4 is a schematic sectional view in the direction B-B in fig. 3.

Wherein: 10. a partition plate; 11. a first through hole; 20. a membrane; 21. an upper diaphragm; 211. a lower surface; 22. a lower diaphragm; 221. an upper surface; 222. a lower surface; 223. a second through hole; 30. pressing the cavity; 40. an electrical conductor; 41. an upper conductor; 411. an upper isolation layer; 42. a lower conductor; 421. a lower isolation layer; 50. a base plate; 51. an airway; 511. a main air passage; 512. a branch airway; 513. an opening; 514. a waterproof breathable film; 52. and (6) a glue layer.

Detailed Description

The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the utility model easier to understand by those skilled in the art, and thus will clearly and clearly define the scope of the utility model.

The up-down direction described in the present invention refers to the up-down direction in fig. 2, 4.

The first embodiment is as follows:

as shown in fig. 1-2, the present invention provides a membrane switch, comprising: the diaphragm 10 extends along the horizontal direction, a first through hole 11 penetrating through the diaphragm 10 along the vertical direction is formed in the diaphragm 10, the diaphragm 20 comprises an upper diaphragm 21 and a lower diaphragm 22, the upper diaphragm 21 is attached to the upper surface of the diaphragm 10 and is in adhesive connection with the diaphragm 10, the lower diaphragm 22 is attached to the lower surface of the diaphragm 10 and is in adhesive connection with the diaphragm 10, the pressing cavity 30 is composed of a cavity defined by a hole wall of the first through hole 11, a lower surface 211 of the upper diaphragm 21 and an upper surface 221 of the lower diaphragm 22, the conductor 40 is located in the pressing cavity 30, the conductor 40 comprises an upper conductor 41 arranged on the lower surface 211 of the upper diaphragm 21 and a lower conductor 42 arranged on the upper surface 221 of the lower diaphragm 22, the bottom plate 50 is attached to a lower surface 222 of the lower diaphragm 22 and is in adhesive connection with the lower diaphragm 22 through a glue layer 52, an air passage 51 communicated with the outside is arranged between the bottom plate 50 and the lower diaphragm 22, the air passage 51 is formed by spaced grooves on the adhesive layer 52, the lower diaphragm 22 is provided with a second through hole 223 for communicating the pressing cavity 30 with the air passage 51, the axis of the second through hole 223 is parallel to the axis of the first through hole 11, and the distance between the axis of the second through hole 223 and the axis of the first through hole 11 is equal to the radius difference between the first through hole 11 and the second through hole 223.

The advantages of such an arrangement are:

1. the circuit between the upper diaphragm and the lower diaphragm can not be exposed in the air through the air passage, and the circuit between the upper diaphragm and the lower diaphragm can be isolated through the bonding connection of the upper diaphragm and the lower diaphragm and the partition plate, so that the membrane switch can be durable;

2. the opening of the second through hole faces to the force application direction of the membrane switch, so that the membrane switch can exhaust more smoothly and has better pressing comfort;

3. the travel distance of water vapor is prolonged, and due to the existence of the air passage, when the water vapor is immersed, a water seal is formed at the outlet of the air passage communicated with the outside, so that water can be prevented from further entering the membrane switch, and the membrane switch has a certain waterproof function.

In this embodiment, the air passage 51 includes a main air passage 511 and a branch air passage 512, the main air passage 511 is provided with an opening 513 communicating with the outside at the edge positions of the bottom plate 50 and the lower film 22, so that the main air passage 511 can communicate with the outside, there is only one opening 513, one end of the branch air passage 512 communicates with the main air passage 511, the other end of the branch air passage 511 communicates with the pressing chamber 30 through a second through hole 223, a portion of the main air passage 511 close to the opening 513 is provided in an S shape, a film-shaped waterproof breathable film 514 is provided in the air passage 51, the waterproof breathable film 514 is located at the end of the air passage 51 far from the pressing chamber 30, and in particular, the waterproof breathable film 514 is provided at the opening 513, which is advantageous in that the difficulty of water vapor entering the pressing chamber 30 through the opening 513 and through the air passage 51 can be further increased, thereby further improving the waterproof effect.

In this embodiment, the outer wall parcel of going up electric conductor 41 has last isolation layer 411, the outer wall parcel of lower electric conductor 42 has lower isolation layer 421, when last isolation layer 411 contacts with lower isolation layer 412, go up electric conductor 41 and lower electric conductor 42 and switch on mutually, it forms by the carbon thick liquid layer sintering of screen printing on last electric conductor 41 outer wall to go up isolation layer 411, lower isolation layer 421 is formed by the carbon thick liquid layer sintering of screen printing on electric conductor 42 outer wall down, the benefit that sets up like this lies in, can press the extreme condition in chamber 30 at steam entering, avoid the corruption of electric conductor 40, make this membrane switch still can trigger, be particularly suitable for the abominable open-air environment of condition.

In this embodiment, the first through holes 11 are provided in plural and spaced from each other, so that the pressing cavities 30 are also provided in plural, and in order to avoid mutual interference between the pressing cavities 30, the branch air passages 512 are also provided in plural, and the plural branch air passages 512 and the plural pressing cavities 30 are provided in one-to-one correspondence.

Example two:

as shown in fig. 3-4, the second embodiment is substantially the same as the first embodiment, except that in the second embodiment, the main air passage 511 is formed by joining the end portions of all the branch air passages 512 far away from the pressing cavity 30, the pipe diameter of the main air passage 511 is much larger than that of the branch air passages 512, the length of the main air passage 511 is much smaller than that of the branch air passages 512, and the main air passage 511 is arranged straight, and the waterproof breathable film 514 is in a plunger shape and is plugged into the main air passage 511 through the opening 513.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. A membrane switch, comprising:

the method is characterized in that:

2. The membrane switch of claim 1, wherein: the air passage comprises a main air passage and a branch air passage, the main air passage is communicated with the outside, one end of the branch air passage is communicated with the main air passage, and the other end of the branch air passage is communicated with the pressing cavity through the second through hole.

3. The membrane switch of claim 2, wherein: the pressing cavity is provided with a plurality of pressing cavities, the branch air passages are also provided with a plurality of branch air passages, and the plurality of branch air passages and the plurality of pressing cavities are arranged in a one-to-one correspondence mode.

4. The membrane switch of claim 3, wherein: the main air passage is formed by the convergence of the end parts of all the branch air passages far away from the pressing cavity.

5. The membrane switch of claim 1, wherein: the axis of the second through hole is parallel to the axis of the first through hole.

6. The membrane switch of claim 5, wherein: the distance between the second through hole axis and the first through hole axis is smaller than or equal to the radius difference between the first through hole and the second through hole.

7. The membrane switch of claim 1, wherein: and a waterproof breathable film is arranged in the air passage.

8. The membrane switch of claim 7, wherein: the waterproof breathable film is positioned at the end part of the air passage far away from the pressing cavity.

9. The membrane switch of claim 1, wherein: the outer wall of the upper conductor is wrapped with an upper isolation layer, the upper isolation layer is formed by sintering a carbon slurry layer printed on the outer wall of the upper conductor, the outer wall of the lower conductor is wrapped with a lower isolation layer, and the lower isolation layer is formed by sintering a carbon slurry layer printed on the outer wall of the lower conductor.

10. The membrane switch according to any one of claims 1 to 9, wherein: the air passage is formed by a spacing groove of a glue layer between the bottom plate and the lower diaphragm.