CN209104037U - A kind of conductive film of thin film switch - Google Patents

Abstract

The utility model relates to membrane switch technology fields; disclose a kind of conductive film of thin film switch; including base film, metal conducting layer and the conductive protecting layer for capableing of conduction, metal conducting layer is fixedly connected on base film, and conductive protecting layer is fixedly connected on one side of the metal conducting layer far from base film.Using metal conducting layer on the base film of insulation printed circuit; utilize the good ductility of metal; it is suitble to the long-time in working condition and high-frequency bending, there is good reliability, guarantees the beam conduction of metal conducting layer while protection by conductive protecting layer to metal conducting layer.

Description

A kind of conductive film of thin film switch

Technical field

The utility model relates to membrane switch technology fields, more specifically, it relates to a kind of conductive film of thin film switch.

Background technique

Thin film switch is an operating system for integrating keypress function, indicator elment, instrument panel, by panel, on Circuit, separation layer, four part of lower circuit composition, to touch connected normal open switch, the upper and lower touching of thin film switch under normal circumstances Point is in off-state.Thin film switch is pressed, the contact of upper circuit deforms downwards, and conducting, finger pine are contacted with the pole plate of lower circuit After opening, upper circuit contact rebound is returned, and circuit disconnects, and a signal is triggered in circuit.Thin film switch structure is rigorous, good appearance, Good airproof performance has the features such as moisture proof, long service life, is widely used in telecommunications, the instrument of electronic surveying, industry control The fields such as system, Medical Devices, auto industry, intelligent toy, household electrical appliance.

In engineering practice, the upper and lower circuit of general thin switch is using insulating film of good performance as circuitous pattern Carrier and on it with conductive silver paste on special technique silk-screen, makes it have electric conductivity, under normal circumstances upper circuit by The contact of pressure, upper circuit deforms downwards, conducting is contacted with the pole plate of lower circuit, after finger unclamps, upper circuit contact rebounds back Come, circuit disconnects.

But conductive silver paste be by adhesive by conductive Argent grain dispersion it is fixed after, cured printed on insulating film, Gu Stable combination is formed between the particle and particle of change process conductive silver paste, but silver paste circuit cost is higher, be not suitable for high-volume Production, and adhesive is general at film strength and toughness, in practice, conductive silver paste silk will appear silver paste electricity by bending state The phenomenon that road is broken and falls off.

Utility model content

It is easily broken off problem with using silver paste circuit in the production of existing thin film switch, the purpose of this utility model exists In providing a kind of conductive film of thin film switch, have the advantages that at low cost and durable.

To achieve the above object, the utility model provides following technical solution:

A kind of conductive film of thin film switch, including base film, metal conducting layer and the conductive protecting layer for capableing of conduction；

The metal conducting layer is fixedly connected on described matrix film, and the conductive protecting layer is fixedly connected on the metal One side of the conductive layer far from described matrix film.

Through the above technical solutions, using metal conducting layer on the base film of insulation printed circuit, it is good using metal Ductility, be suitble to the long-time in working condition and high-frequency bending, have good reliability, by conductive protecting layer Guarantee the beam conduction of metal conducting layer while protection to metal conducting layer.

Further, the conductive protecting layer is compound carbon film layer.

Through the above technical solutions, carbon itself has good electric conductivity and corrosion resistance, it can be in protection metallic conduction Layer keeps good electric conductivity while not being corroded.

Further, the metal conducting layer is with a thickness of preferably 0.0065mm ~ 0.03mm.

Through the above technical solutions, the more thin then resistance of metal conducting layer is smaller, but it is more thinner easier fracture, protecting Reduce resistance, save the cost while demonstrate,proving metal conducting layer structural strength.

Further, the conductive protecting layer is made of graphene and carbon nanotube.

Through the above technical solutions, this conductive protecting layer is resin film, graphene is easy aggregation, and carbon nanotube possesses well Electric conductivity, also possess good flexibility, the two combines, i.e., effectively played the electric conductivity of graphene and carbon nanotube, So that dispersibility of the graphene in film medium (resin) is improved again, and then can make to accommodate more graphite in film medium Alkene and carbon nanotube, to further increase conductive capability.

Further, described matrix film is made of PET film.

Through the above technical solutions, PET film is also known as high-temperature polyester film, there is good insulation and heat-resisting quantity, and And cost is relatively low, and batch is suitble to use.

Further, the thickness of the PET film is preferably 0.01mm.

Through the above technical solutions, reducing cost while guaranteeing base's film-strength.

Compared with prior art, the utility model has the beneficial effects that

(1) it is fixed on the base film of insulation by using metal conducting layer, to replace the conductive silver paste silk of higher cost, Simultaneously because the good ductility of metal, makes thin film switch in high frequency and the lasting course of work, the metal on base film is led Electric layer will not be broken and fall off because of bending, improve the reliability, stability and durability of conductive film；

It (2), can be to gold by the way that the compound carbon film being made of graphene and carbon nanotube is fixedly installed on metal conducting layer Belong to conductive layer and certain corrosion resistance is provided, graphene powder and carbon nanotube are nano-scale particle, and granularity is much smaller than stone Ink and carbon black, under identical volume, conductive particle is big, and intergranular contact probability is relatively low, and there are biggish space meeting quilts Occupied by idioelectric adhesive, is obstructed to be formed to conductive particle, decline electric conductivity, conversely, fine particle connects It touches probability to improve, energy electric conductivity is improved.And graphene powder and specific surface area of carbon nanotube and granulation uniformity are again Be much better than graphite and carbon black, they with the conjugation of adhesive and in adhesive dispersibility have a considerable improvement, therefore Film layer compactness and conductivity uniformity is substantially improved in the compound of graphene carbon nanotube, form compact and stable composite membrane make layering and The defects of picking, greatly reduces, and flexibility improves, and can bear the contact of upper and lower circuit high frequency time great dynamics without damaging, ensure and led Reliability, durability and the consistency of electrolemma；

(3) metal conducting layer resistance is small, and compound carbon film can starch thickness by reducing carbon as contact resistance functionally, The area for increasing carbon slurry, by resistance control in 0.5 ohm, resistance value is stablized.

Detailed description of the invention

Fig. 1 is the diagrammatic cross-section of the utility model.

Appended drawing reference: 1, base film；2, metal conducting layer；3, conductive protecting layer.

Specific embodiment

With reference to the accompanying drawings and examples, the utility model is described in detail.

A kind of conductive film of thin film switch, as shown in Figure 1, including that base film 1 is led with the metal for being fixed on 1 surface of base film Electric layer 2, metal conducting layer 2 can be aluminum conductive filament, or copper is fixed on base film 1 by the bonding agent of insulation, Make the conductive film of thin film switch and greatly reduce cost while there is good electric conductivity, and aluminium has good extension Property, it, can connecing in the upper and lower circuit high frequency time great dynamics of thin film switch by aluminum conductive filament with a thickness of preferably 0.008mm Damage will not be bent in touching, and there is good reliability.

Base film 1 is made of PET film, and PET film is also known as high-temperature polyester film, has good insulation and heat-resisting quantity, And cost is relatively low, and batch is suitble to use, and the thickness of PET film is preferably 0.01mm, is guaranteeing base's film-strength Cost is reduced simultaneously.

Conductive protecting layer 3 is coated on aluminum conductive filament, which is to be made of graphene and carbon nanotube Compound carbon film aluminum conducting wire can protected not to be corroded using the good electric conductivity of carbon itself and corrosion resistance, improve it is thin The toughness and reliability of the conductive film of membrane switch, make it be not easy to fracture.

Moreover, composite membrane of the composite membrane compared to existing graphite and carbon black, microcosmic, with the stone of two-dimensional structure Black alkene replaces the graphite of high thickness stratiform, and the carbon black of bulky grain, the graphite of two-dimensional structure are replaced with one-dimensional linear carbon nanotube It is more uniform and more easily by electronics that electronics grid is formed by between alkene and one-dimensional linear carbon nanotube, thus graphene With the electric conductivity, conductivity, conductivity uniformity of the composite membrane of carbon nanotube all there is graphite and carbon black composite membrane can not go beyond Height.The easy aggregation of graphene, the good electric conductivity and flexibility of carbon nanotube, the two combine, i.e., effectively play The electric conductivity of graphene and carbon nanotube, and dispersibility of the graphene in film medium (resin) is made to be improved, in turn It can make to accommodate more graphenes and carbon nanotube in film medium, to further increase conductive capability.

Considering needs of the product in different applicable situations, the amount of institute's containing graphene and carbon nanotube is in compound carbon film The mass ratio of 1.1-16wt%, graphene and carbon nanotube is (3-4): 2, conductive matter is constantly adjusted, to improve conductive film Performance, make its in the application more targetedly.

The above is only the preferred embodiment of the utility model, and the protection scope of the utility model is not limited merely to Above-described embodiment, technical solution belonging to the idea of the present invention belong to the protection scope of the utility model.It should refer to Out, for those skilled in the art, it is without departing from the principle of the utility model it is several improvement and Retouching, these improvements and modifications also should be regarded as the protection scope of the utility model.

Claims (6)

1. a kind of conductive film of thin film switch, which is characterized in that including base film (1), metal conducting layer (2) and conductive protecting layer (3)；

The metal conducting layer (2) is fixedly connected on described matrix film (1), and the conductive protecting layer (3) is fixedly connected on institute State the one side of metal conducting layer (2) far from described matrix film (1).

2. the conductive film of thin film switch according to claim 1, which is characterized in that the conductive protecting layer (3) is compound Carbon film layer.

3. the conductive film of thin film switch according to claim 2, which is characterized in that the thickness of the metal conducting layer (2) For 0.0065mm ~ 0.03mm.

4. the conductive film of thin film switch according to claim 2, which is characterized in that the conductive protecting layer (3) is by graphite Alkene and carbon nanotube are constituted.

5. the conductive film of thin film switch according to claim 1, which is characterized in that described matrix film (1) is by PET film system At.

6. the conductive film of thin film switch according to claim 5, which is characterized in that the PET film with a thickness of 0.01mm.