CN210865990U

CN210865990U - Film switch with strong deformation recovery

Info

Publication number: CN210865990U
Application number: CN202020027419.7U
Authority: CN
Inventors: 陆志雄; 马喻瀚
Original assignee: Dongguan Yuanjiaxin Film Switch Co ltd
Current assignee: Dongguan Yuanjiaxin Film Switch Co ltd
Priority date: 2020-01-07
Filing date: 2020-01-07
Publication date: 2020-06-26
Anticipated expiration: 2030-01-07

Abstract

The utility model discloses a stronger membrane switch of deformation recovery nature is provided with the conduction external member, triggers the external member and holds the external member in top. The arrangement of the cross-shaped supporting piece and the jacking column ensures that a worker can deform the conductive elastic sheet by pressing a few keys, so that the conductive elastic sheet is contacted with the conductive dome part, and further, the signal is sent; meanwhile, the triggering stroke of the key is shortened, so that the deformation degree of the key is reduced, and the situation that the key cannot be restored due to excessive deformation can be prevented; the vent hole is formed, so that air between the conductive elastic sheet and the conductive dome part can be communicated with the outside, and a negative pressure environment is prevented from being formed between the conductive elastic sheet and the conductive dome part, so that the conductive elastic sheet is prevented from being incapable of elastic deformation due to negative pressure acting force; the setting of each anti-skidding bellying has increased the coefficient of friction of key cap to improve the frictional force size between hand and the key cap, and then can prevent mutually skidding between hand and the key cap.

Description

Film switch with strong deformation recovery

Technical Field

The utility model relates to a membrane switch technical field especially relates to a stronger membrane switch of deformation restitution nature.

Background

The membrane switch is also called as a touch keyboard, adopts an integral sealing structure formed by combining a plurality of layers of planes, is a novel integrated light-collecting, mechanical and electrical electronic component which seals a key switch, a panel, a mark, a symbol display and a lining plate together, is a fundamental change of the appearance structure of an electronic product, can replace the keys of conventional discrete components, and can more reliably execute the task of an operating system. The membrane switch has the advantages of good water resistance, dust resistance, oil resistance, harmful gas corrosion resistance, stable and reliable performance, light weight, small volume, long service life, convenient assembly and connection, washable panel without damage to characters, rich color, elegant appearance and the like, so the membrane switch has more epoch-making characteristics.

The existing membrane switch mainly comprises a surface membrane layer, an upper isolation layer, an upper circuit layer, a middle isolation layer, a lower circuit layer and a lower isolation layer which are sequentially connected, and different functional functions are managed among the layers. However, in the practical application process, the existing membrane switch still has certain disadvantages: firstly, the descending stroke of the key bulge on the mask layer is too long, so that when the key bulge is pressed to operate the membrane switch, the key bulge cannot be restored to the original position due to excessive depression, and the deformation restoration performance of the key bulge is poor; secondly, the gaps between the layers are very small, so that a closed space can be formed between the elastic sheet of the upper circuit layer and the contact on the lower circuit layer, when the elastic sheet is stressed and bent, a negative pressure environment is easily formed in the closed space, the reset resistance of the elastic sheet is increased, and the elastic sheet is difficult to reset; in addition, the raised surfaces of the keys on the mask layer are relatively smooth, resulting in easy slippage between the hands of the worker and the surfaces of the keys.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming the weak point among the prior art, providing one kind and having reduced the bellied decline stroke of button, the resistance that resets of the shell fragment on last circuit layer is less and can prevent the stronger film switch of deformation recovery nature that hand and button surface skidded mutually.

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

a thin film switch with high deformation recovery includes:

the conductive kit comprises a lower isolation layer, a lower line layer and a conductive plug, wherein the lower line layer is arranged on the lower isolation layer, a conductive circuit is etched on the lower line layer, a conductive dome part is arranged on the lower line layer and connected with the conductive circuit, the conductive plug is arranged on the lower line layer and connected with the conductive circuit;

the trigger external member comprises an intermediate isolation layer, a trigger layer and a conductive elastic sheet, wherein the intermediate isolation layer is arranged on the lower circuit layer, the trigger layer is arranged on the intermediate isolation layer, a position avoiding hole is formed in the intermediate isolation layer, the side wall of the position avoiding hole extends towards the direction far away from the intermediate isolation layer to form an isolation ring, a plurality of vent holes are formed in the side wall of the isolation ring, each vent hole faces the position avoiding hole, the vent holes are circumferentially distributed along the central axis of the position avoiding hole, the conductive elastic sheet comprises a sleeve portion, a compression portion and a plurality of connecting portions, the sleeve portion is arranged on the trigger layer, each connecting portion is arranged on the sleeve portion, and each connecting portion is connected with the compression portion; and

the top holds the external member, the top holds the external member and includes isolation layer, facial mask layer and button, go up the isolation layer set up in on the trigger layer, the facial mask layer set up in go up on the isolation layer, the button includes key cap, cross support piece and top and holds the post, the key cap set up in on the facial mask layer, be provided with a plurality of anti-skidding bellyings on the key cap, cross support piece set up in on the key cap, the top hold the post set up in on the cross support piece.

In one embodiment, the conductive plug is provided with a chamfered portion.

In one embodiment, the central axis of the cross support and the central axis of the top support are coincident with each other.

In one embodiment, a side of the keycap far away from the upper isolation layer is provided with a limit ring wall.

In one embodiment, the key has a bilateral symmetry structure.

In one embodiment, the sleeve portion, the pressed portion and each of the connecting portions are integrally formed.

In one embodiment, the upper spacer layer has a thickness of 0.25mm to 0.28 mm.

In one embodiment, a buffer dome is provided on the support pillar.

In one embodiment, the aperture size of each of the ventilation holes gradually increases towards a direction away from the center of the avoiding hole.

In one embodiment, each of the connecting portions is circumferentially distributed around a central axis of the pressure receiving portion, and a space is provided between two adjacent connecting portions.

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

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 diagram of a membrane switch with high deformation recovery performance according to an embodiment of the present invention;

FIG. 2 is an enlarged view of the membrane switch of FIG. 1 at A;

FIG. 3 is an enlarged view of the membrane switch shown in FIG. 1 with a strong strain recovery at B;

fig. 4 is a schematic structural view of a top holding kit 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, the membrane switch 10 with high deformation recovery includes a conduction kit 100, a trigger kit 200 and a top supporting kit 300, wherein the trigger kit 200 is disposed on the conduction kit 100, and the top supporting kit 300 is disposed on the trigger kit 200.

As such, it should be noted that the supporting sleeve 300 is used for supporting the triggering sleeve 200, so as to deform the triggering sleeve 200, so that the triggering sleeve 200 contacts with the conduction sleeve 100, and an electrical signal is generated on the conduction sleeve 100.

Referring to fig. 1 again, the conductive kit 100 includes a lower isolation layer 110, a lower circuit layer 120 and a conductive plug 130, the lower circuit layer 120 is disposed on the lower isolation layer 110, a conductive trace 121 is etched on the lower circuit layer 120, a conductive dome 140 is disposed on the lower circuit layer 120, the conductive dome 140 is connected to the conductive trace 121, the conductive plug 130 is disposed on the lower circuit layer 120, and the conductive plug 130 is connected to the conductive trace 121.

Thus, it should be noted that the lower isolation layer 110 plays a role of protecting the lower circuit layer 120; the lower circuit layer 120 is used for etching the conductive circuit 121; the conductive traces 121 are used to transmit electrical signals on top of the conductive elements to the conductive plugs 130; the conductive dome portion 140 is used to contact the spring piece of the trigger assembly 200, so as to generate an electrical signal on the conductive dome portion 140.

Referring to fig. 1 and 2, the trigger assembly 200 includes an intermediate isolation layer 210, a trigger layer 220 and a conductive elastic sheet 230, the intermediate isolation layer 210 is disposed on the lower circuit layer 120, the trigger layer 220 is disposed on the intermediate isolation layer 210, a position-avoiding hole 211 is disposed on the intermediate isolation layer 210, a sidewall of the position-avoiding hole 211 extends in a direction away from the intermediate isolation layer 210 to form an isolation ring 212, a plurality of vent holes 2121 are disposed on a sidewall of the isolation ring 212, each vent hole 2121 faces the position-avoiding hole 211, and each vent hole 2121 is circumferentially distributed around a central axis of the position-avoiding hole 211, the conductive elastic sheet 230 includes a sleeve portion 231, a pressed portion 232 and a plurality of connection portions 233, the sleeve portion 231 is disposed on the trigger layer 220, each connection portion 233 is disposed on the sleeve portion 231, and each connection portion 233 is connected to the pressed portion 232.

Thus, it should be noted that the middle isolation layer 210 serves to isolate the trigger layer 220 from the lower circuit layer 120, and is used to prevent the trigger layer 220 from making circuit miscontact with the lower circuit layer 120; the trigger layer 220 is used for fixing and mounting the conductive elastic sheet 230; the conductive elastic sheet 230 is depressed toward the conductive dome 140 under the action of the propping sleeve 300, and when the conductive elastic sheet 230 is deformed to a certain degree, the conductive elastic sheet contacts the conductive dome 140, so that an electrical signal can be generated on the lower circuit layer 120, and finally the electrical signal is transmitted to the conductive plug 130; the isolation ring 212 plays a role of surrounding and protecting the conductive elastic sheet 230; the sleeve portion 231 functions to support the connection portion 233; the connecting portion 233 has certain elasticity, and plays a role in supporting the pressure receiving portion 232 and simultaneously driving the pressure receiving portion 232 to elastically reset together; the pressed portion 232 is used for bearing the force applied to the conductive elastic sheet 230 by the worker through the propping assembly 300, and can drive the connecting portions 233 to deform together in the direction close to the conductive dome portion 140, and also has the function of touching the conductive dome portion 140 to generate an electrical signal.

Secondly, it should be noted that, in the practical application process, when a worker operates the propping sleeve 300 to prop the conductive elastic sheet 230, so that the conductive elastic sheet 230 is deformed, two sides of the middle isolation layer 210 are respectively in close contact with the trigger layer 220 and the lower circuit layer 120, so that a closed space is formed between the conductive elastic sheet 230, the isolation ring 212, the middle isolation layer 210 and the conductive dome part 140, and further, in the process of deformation of the conductive elastic sheet 230, air in the closed space is exhausted to the outside, and when the worker releases the propping sleeve 300, a negative pressure is formed in the closed space, so that the conductive elastic sheet 230 is subjected to an atmospheric pressure in the rebounding process, and the rebounding cannot be smoothly completed;

and in the technical scheme of the utility model, seting up of each air vent 2121 on the spacer ring 212 for in the air between electrically conductive shell fragment 230 and the electrically conductive dome portion 140 can distribute to external environment fast, also make external environment's air can supply fast to between electrically conductive shell fragment 230 and the electrically conductive dome portion 140, make sunken deformation and the deformation that resets of going on that electrically conductive shell fragment 230 can be smooth.

Preferably, referring to fig. 3, a chamfered portion 131 is provided on the conductive plug 130.

In this manner, it should be noted that the chamfered portion 131 is provided so that the conductive plug 130 can be inserted into the signal transmission port adapted to the conductive plug 130 more quickly.

Preferably, referring to fig. 2 again, the aperture size of each vent hole 2121 gradually increases toward the direction away from the center of the avoiding hole 211.

In this way, it should be noted that the gradual change of the aperture of the avoiding hole 211 enables the air between the conductive elastic piece 230 and the conductive dome 140 to be emitted to the external environment more rapidly.

Preferably, referring to fig. 2 again, each connecting portion 233 is circumferentially distributed around the central axis of the pressure receiving portion 232, and a space is disposed between two adjacent connecting portions 233.

In this manner, the connection portions 233 are circumferentially distributed about the central axis of the pressure receiving portion 232, so that the pressure received by the pressure receiving portion 232 can be uniformly transmitted to the connection portions 233.

Preferably, referring to fig. 2 again, the sleeve portion 331, the pressure receiving portion 332 and each connecting portion 333 are integrally formed.

In this way, the sleeve portion 331, the pressure receiving portion 332, and the connecting portions 333 are integrally formed, so that the overall mechanical strength of the push button 330 can be effectively improved, the durability of the push button 330 can be improved, and the service life of the membrane switch can be prolonged.

Referring to fig. 1 and 4, the top holding kit 300 includes an upper isolation layer 310, a mask layer 320 and a key 330, the upper isolation layer 310 is disposed on the trigger layer 220, the mask layer 320 is disposed on the upper isolation layer 310, the key 330 includes a key cap 331, a cross support 332 and a top holding column 333, the key cap 331 is disposed on the mask layer 320, the key cap 331 is provided with a plurality of anti-slip protrusions 334, the cross support 332 is disposed on the key cap 331, and the top holding column 333 is disposed on the cross support 332.

Thus, it should be noted that the upper isolation layer 310 functions to isolate the isolation surface film layer 320 from the trigger layer 220; the mask layer 320 is used for protecting the upper isolation layer 310 and also for installing and fixing the key 330; the keycap 331 is used to facilitate the user to operate the membrane switch; the cross support 332 has a certain elasticity, and is used for supporting and positioning the supporting pillar 333, and after the user releases the key cap 331, the cross support 332 drives the positioning supporting pillar 333 to return to the original position together.

Furthermore, in the practical application process, when the membrane switch needs to be operated, only the key cap 331 needs to be pressed, and the key cap 331 will support the conductive elastic sheet 230 through the supporting column 333, so that the conductive elastic sheet 230 contacts with the conductive dome portion 140, and further the lower circuit layer 120 can output an electrical signal to the conductive plug 130.

Specifically, referring to fig. 1 again, the thickness of the upper isolation layer 310 is 0.25mm to 0.28 mm.

Thus, the upper isolation layer 310 is 0.25 mm-0.28 mm thick, so that the compactness of the membrane switch can be improved as much as possible under the condition of effectively separating the surface membrane layer 320 from the trigger layer 220, and the membrane switch is lighter and lighter.

Preferably, referring again to fig. 4, the central axis of the cross support 332 and the central axis of the prop 333 coincide with each other.

In this way, it should be noted that, by overlapping the central axis of the cross support 332 and the central axis of the supporting column 333, the pressure applied to the supporting column 333 can be uniformly transmitted to the cross support 332, and the cross support 332 is prevented from being damaged due to the local excessive force.

Preferably, referring again to fig. 4, the prop 333 is provided with a buffer dome 3331.

In this way, the buffer dome portion 3331 is provided to prevent the abutting column 333 and the conductive elastic piece 230 from being damaged due to stress concentration during the process of abutting the abutting column 333 against the conductive elastic piece 230.

Preferably, referring to fig. 1 again, the side of the key cap 331 away from the upper isolation layer 310 is provided with a limit ring wall 335.

In this manner, the retainer ring wall 335 is provided to further prevent the user's hand from slipping off the key cap 331 when the user presses the key cap 331.

Preferably, referring again to fig. 1, the key 330 has a bilateral symmetry structure.

Thus, it should be noted that the keys 330 are arranged in a bilaterally symmetrical structure, so that the force applied to the keys 330 by the user can be more uniformly distributed to various positions of the keys 330.

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 membrane switch with high deformation restorability, comprising:

2. The membrane switch with high deformation recovery of claim 1, wherein the conductive plug is provided with a chamfer.

3. The membrane switch with high deformation recovery property of claim 1, wherein the central axis of the cross-shaped supporting member and the central axis of the supporting column are coincident with each other.

4. The membrane switch with stronger deformation recovery property of claim 1, wherein a side of the keycap far away from the upper isolation layer is provided with a limiting ring wall.

5. The membrane switch with stronger deformation restorability of claim 4, wherein the key has a bilateral symmetry structure.

6. The membrane switch with high strain recovery according to claim 1, wherein the sleeve portion, the pressed portion, and each of the connection portions are formed as an integral structure.

7. The membrane switch with stronger deformation recovery property according to claim 1, wherein the thickness of the upper isolation layer is 0.25mm to 0.28 mm.

8. The membrane switch according to claim 1, wherein a buffer dome portion is provided on the support post.

9. The membrane switch with strong deformation restorability of claim 1, wherein the aperture size of each vent hole gradually increases towards a direction away from the center of the avoiding hole.

10. The membrane switch with high deformation recovery according to claim 1, wherein each of the connecting portions is circumferentially distributed around a central axis of the pressed portion, and a space is provided between two adjacent connecting portions.