Punching type membrane switch with composite layer

Abstract

The utility model discloses a blanking type membrane switch with a composite layer, which belongs to the technical field of electronic switches and comprises a panel layer, a touch feedback layer is arranged above the panel layer, an anti-dazzle PET (polyethylene terephthalate) protective layer is arranged above the touch feedback layer, an upper circuit layer is arranged at the bottom of the panel layer, and a lower circuit layer is arranged at the bottom of the panel layer. A flexible conducting layer is arranged on the upper surface of the upper circuit layer, the panel layer and the upper circuit layer are connected in a gluing mode through a surface glue layer, a lower circuit layer is arranged at the bottom of the upper circuit layer, and an isolating layer is arranged between the upper circuit layer and the lower circuit layer. The surface of the membrane switch has high light transmittance and good scratch resistance through the arranged anti-dazzle PET protective layer, a screen can be protected from being scratched and polluted, reflection of external light on the screen is effectively reduced, local heat generated during operation can be rapidly conducted out through the arranged insulating base material layer, and the service life of the membrane switch is prolonged. And local aging of each part caused by high temperature is avoided.

Description

Technical Field

[0001] This utility model belongs to the field of electronic switch technology, specifically relating to a punched membrane switch with a composite layer. Background Technology

[0002] Membrane switches, also known as tactile keyboards, employ a planar multi-layered sealed structure. They are a new type of electronic component that integrates optics, mechanics, and electronics, sealing the key switch, panel, markings, symbol display, and backing plate together. This represents a fundamental change in the appearance and structure of electronic products. They can replace conventional discrete key components and more reliably perform operating system tasks.

[0003] The existing patent number CN201910844959.6 discloses an antistatic membrane switch and its manufacturing method. The key technical points include a panel, an upper circuit layer, an insulating layer, a lower circuit layer, and a base adhesive layer arranged sequentially from top to bottom. These layers are bonded together using adhesive. The key feature is that a grid-like conductive silver paste layer is printed on the side of the upper circuit layer facing the panel layer. One end of the conductive silver paste layer leads out an electrostatic discharge line and is grounded. This invention achieves the effect of adding antistatic functionality without significantly altering the original membrane switch thickness, while ensuring stable electrostatic discharge.

[0004] The membrane switch in the aforementioned patent has the following problems:

[0005] 1. Poor environmental adaptability: The surface of the membrane switch is prone to scratches and contamination, the protective layer has insufficient weather resistance, and the conductive layer oxidizes in high-temperature environments, which can easily cause fluctuations in resistance and affect subsequent use;

[0006] 2. Unique tactile feedback: Lacking a layered feedback design, it is impossible to distinguish the button trigger state. To address this, we propose a die-cut membrane switch with a composite layer. Utility Model Content

[0007] The purpose of this invention is to provide a die-cut membrane switch with a composite layer to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a die-cut membrane switch with a composite layer, comprising a panel layer, a tactile feedback layer disposed above the panel layer, an anti-glare PET protective layer disposed above the tactile feedback layer, an upper circuit layer disposed at the bottom of the panel layer, a flexible conductive layer disposed on the upper surface of the upper circuit layer, the panel layer and the upper circuit layer being bonded together by a surface adhesive layer, a lower circuit layer disposed at the bottom of the upper circuit layer, an isolation layer disposed between the upper circuit layer and the lower circuit layer, an insulating substrate layer disposed at the bottom of the lower circuit layer, and a back adhesive layer disposed at the bottom of the insulating substrate layer.

[0009] Preferably, the surface of the tactile feedback layer is provided with multiple sets of micro-bumps, which are arranged in an array.

[0010] Preferably, the flexible conductive layer is a silver-carbon nanotube composite material.

[0011] Preferably, the surface of the anti-glare PET protective layer is coated with a composite coating, which is silicon dioxide-organosilicon.

[0012] Preferably, the micro-bump array of the haptic feedback layer has a gradually varying density distribution.

[0013] Preferably, the insulating substrate layer is a polyimide (PI)-aramid fiber composite film.

[0014] Preferably, the adhesive backing layer is a two-component acrylate-epoxy resin adhesive.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. The anti-glare PET protective layer gives the membrane switch a high light transmittance and good scratch resistance, protecting the screen from scratches and contamination. It also effectively reduces the reflection of external light on the screen. The insulating substrate layer can quickly dissipate the local heat generated during operation, preventing local aging of components due to high temperature.

[0017] 2. By distributing the micro-bumps above the haptic feedback layer in a gradually varying density, it is easy to match the changes in the contact area of ​​human finger pressure. When touched lightly, only the top of the micro-bumps deforms (triggers a low-resistance signal), while when pressed deeply, the micro-bumps are compressed as a whole, increasing the contact area between the flexible conductive layer and the bottom circuit (triggers a high-resistance signal), thus realizing the differentiation of operation states. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall exploded structure of this utility model.

[0019] In the diagram: 1. Panel layer; 2. Haptic feedback layer; 201. Micro-bumps; 3. Anti-glare PET protective layer; 301. Composite coating; 4. Adhesive layer; 5. Flexible conductive layer; 6. Upper circuit layer; 7. Isolation layer; 8. Lower circuit layer; 9. Insulating substrate layer; 10. Backing adhesive layer. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figure 1 This utility model provides a technical solution: a die-cut membrane switch with a composite layer, including a panel layer 1, a tactile feedback layer 2 above the panel layer 1, an anti-glare PET protective layer 3 above the tactile feedback layer 2, an upper circuit layer 6 at the bottom of the panel layer 1, a flexible conductive layer 5 on the upper surface of the upper circuit layer 6, the panel layer 1 and the upper circuit layer 6 being bonded together by a surface adhesive layer 4, a lower circuit layer 8 at the bottom of the upper circuit layer 6, an isolation layer 7 between the upper circuit layer 6 and the lower circuit layer 8, an insulating substrate layer 9 at the bottom of the lower circuit layer 8, and a back adhesive layer 10 at the bottom of the insulating substrate layer 9.

[0022] Specifically, the surface of the haptic feedback layer 2 is provided with multiple sets of micro-bumps 201, which are arranged in an array and have a height of 50~200μm. The micro-bumps 201 are molded with UV-cured resin to provide two levels of pressing resistance: light touch and deep pressure.

[0023] Specifically, the flexible conductive layer 5 is a silver-carbon nanotube composite material.

[0024] Specifically, the surface of the anti-glare PET protective layer 3 is coated with a composite coating 301, which is silicon dioxide-organosilicon.

[0025] Specifically, the micro-bumps 201 array of the haptic feedback layer 2 has a gradually varying density distribution, with the density in the central region being greater than that in the edge region.

[0026] Specifically, the insulating substrate layer 9 is a polyimide (PI)-aramid fiber composite film with a thickness of 0.1~0.3 mm.

[0027] Specifically, the adhesive backing layer 10 uses an acrylic-epoxy two-component adhesive.

[0028] In this embodiment, the flexible conductive layer 5 increases the bending life of the device, and the anti-glare PET protective layer 3 gives the surface of the membrane switch high light transmittance and good scratch resistance, which can protect the screen from scratches and contamination, extend the service life of the membrane switch, and the anti-glare PET protective layer 3 can effectively reduce the reflection of external light on the screen, especially in strong light environment, which can provide a clearer visual experience and reduce eye fatigue.

[0029] By distributing the micro-bumps 201 above the haptic feedback layer 2 in a gradually varying density, it is easy to match the changes in the contact area of ​​human finger pressure. When touched lightly, only the top of the micro-bumps 201 deforms to trigger a low-resistance signal. When pressed deeply, the micro-bumps 201 are compressed as a whole, and the contact area between the flexible conductive layer 5 and the bottom circuit increases to trigger a high-resistance signal, thus realizing the differentiation of operation states.

[0030] The insulating substrate layer 9 can be used to quickly dissipate local heat generated during operation, preventing local aging of components due to high temperature and affecting subsequent use. The adhesive backing layer 10 can be reversibly peeled off even after curing, reducing the difficulty of peeling and facilitating rework.

[0031] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, the phrase "comprising an element defined as..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A die-cut membrane switch with a composite layer, including a panel layer, characterized in that: A tactile feedback layer is provided above the panel layer, and an anti-glare PET protective layer is provided above the tactile feedback layer. An upper circuit layer is provided at the bottom of the panel layer, and a flexible conductive layer is provided on the upper surface of the upper circuit layer. The panel layer and the upper circuit layer are bonded together by a surface adhesive layer. A lower circuit layer is provided at the bottom of the upper circuit layer, and an isolation layer is provided between the upper circuit layer and the lower circuit layer. An insulating substrate layer is provided at the bottom of the lower circuit layer, and a back adhesive layer is provided at the bottom of the insulating substrate layer.

2. The punched membrane switch with a composite layer according to claim 1, characterized in that: The surface of the haptic feedback layer is provided with multiple sets of micro-bumps (201), which are arranged in an array.

3. The die-cut membrane switch with a composite layer according to claim 1, characterized in that: The flexible conductive layer is a silver-carbon nanotube composite material.

4. The die-cut membrane switch with a composite layer according to claim 1, characterized in that: The surface of the anti-glare PET protective layer is coated with a composite coating (301), which is silicon dioxide-organosilicon.

5. The die-cut membrane switch with a composite layer according to claim 1, characterized in that: The micro-bumps (201) array of the haptic feedback layer has a gradually varying density distribution.

6. The die-cut membrane switch with a composite layer according to claim 1, characterized in that: The insulating substrate layer is a polyimide (PI)-aramid fiber composite film.

7. The die-cut membrane switch with a composite layer according to claim 1, characterized in that: The adhesive backing layer is made of a two-component acrylate-epoxy resin adhesive.

Images