CN104201027A

CN104201027A - Thin film switch

Info

Publication number: CN104201027A
Application number: CN201410362792.7A
Authority: CN
Inventors: 王健
Original assignee: SHANGHAI SONGQING MEMBRANE SWITCH Co Ltd
Current assignee: SHANGHAI SONGQING MEMBRANE SWITCH Co Ltd
Priority date: 2014-07-28
Filing date: 2014-07-28
Publication date: 2014-12-10

Abstract

The invention discloses a thin film switch. The thin film switch comprises a thin film body and a key circuit which is printed on the front side and the back side or any side of the thin film body; the key circuit comprises a plurality of function keys and error-proofing keys which are single-stage keys; the thin film body is formed by insulation materials such as paper, polyester, glass or PET (Polyethylene Terephthalate); the key circuit is formed by conductive carbon paste materials such as one or more than two mixtures of copper, aluminum, carbon and silver. According to the thin film switch, the structure of the thin film switch is greatly simplified, the conductive carbon paste is stable, the thin film switch is long in service life, the production cost is reduced, the production process is simple, and the production efficiency is significantly improved.

Description

Thin film switch

Technical field

The present invention relates to electronic switch field, specifically a kind of thin film switch.

Background technology

Thin film switch is that multilayer material is compound, on different materials, by printing, assembles different conducting wires, key spring plate, and when function button that user's finger presses face sticks, conducting circuit, connects the signal of telecommunication, the system works outside control interface.

Existing thin film switch generally consists of the following components:

Face pastes: generally print button with plastic sheet, and picture and text etc., common used material has PVC, PC, PET.

Metal clips: arch metal clips, handfeel of keys can be provided, also can be used as circuit resilient contact.

Separator: made by insulation sheet material, be generally PET, upper and lower contact place borehole, because there is separator, forms external series gap between upper and lower contact, can be from borehole and lower contact conducting in the time that upper contact pressurized is downward.

Vault: by mould heat pressure, form arch bag on PET sheet material, can sink in the time of finger presses, resilience after loosing one's grip, the function of replacement metal clips.

Flexible printed wiring: be generally conductive silver paste and be printed on PET sheet material, complete after baking-curing.

Bonding with adhesive sticker between each working lining.

Operation principle: all buttons have two electrodes, the two poles of the earth are disconnection Like state at button place at ordinary times.Work as button pressed, upper and lower contact contact, the two poles of the earth conducting, electric current passes through, and forms signal, and after single-chip microcomputer perception, control interface external system is executed the task.

Due to physical action, materials chemistry reaction etc., easily cause various faults.Carefully state as follows:

(1) repeatedly bending fatigue of metal clips, loses resilience force, causes keys deactivation;

(2) metal clips is repeatedly pressed rear internal displacement, leaves contact, causes keys deactivation;

(3) do not use metal clips, use the circuit of vault construction, because vault repeatedly bends, plastics follow the string or rupture, and inefficacy causes opening circuit;

(4) because silver chemical character is active, oxidizable, line resistance is raise, cause heating to be opened circuit;

(5) in silver chance air, sulfur dioxide easily vulcanizes, and causes opening circuit;

(6) silver-colored circuit can silver-colored transport reaction when charged, and silver ion can free movement, in the time connecting All other routes, is short-circuited;

(7) face subsides button is repeatedly pressed, the jackknifing breakage of button edge, and outward appearance is destroyed or water inlet short circuit;

(8) the mechanical switch handle multiple-contact face of light touch switch type thin film switch pastes, and face pastes and poked;

(9) dust in air, the corrosion contacts such as steam are met in mechanical switch contact;

(10) fatigue deformation of mechanical switch internal material causes fault.

And electric conducting material is as noble silver, plastics, adhesive etc., non-environmental protection, cost are large, complex structure, assemble consuming time taking a lot of work.

Summary of the invention

In order to address the above problem, the object of the present invention is to provide a kind of low cost, good stability, long service life, environment-friendly type thin film switch.

The present invention solves the technical scheme adopting:

A kind of thin film switch, comprises film bulk and is printed in described film bulk tow sides or the button circuit of any one side, described button circuit comprises some function buttons and mistake proofing key, and described function button and mistake proofing key are single-stage button.

Preferably, described film bulk material is insulating material.

Preferably, described button circuit material is conductive carbon paste.

Preferably, described insulating material is paper, polyester, glass or PET.

Preferably, described conductive carbon paste is one or more mixtures of copper, aluminium, carbon, silver.

Beneficial effect of the present invention: thin film switch of the present invention, without physical deformation, there will not be fracture damaged; This technology requires lower to electric conducting material resistance, the long wire of same 10cm, prior art Standard General requires in resistance 50 Europe mothers, and this technology, 5000 Europe mothers can work with interior, so, electrically conductive ink just can use high resistance ink, as one or more mixtures of copper, aluminium, carbon, silver, this type of electrically conductive ink chemical property does not have noble metal active, has avoided the incipient fault that uses noble metal to bring.So the technical program has been got rid of a large amount of potential faults from source.

Brief description of the drawings

Fig. 1 is the structural representation of thin film switch of the present invention.

Number in the figure is described as follows: 1-film bulk, 2-function button, 3-mistake proofing key.

Embodiment

Further illustrate technical scheme of the present invention below in conjunction with accompanying drawing and by embodiment.

As shown in Figure 1, thin film switch of the present invention, comprise film bulk 1 and be printed in described film bulk 1 tow sides or the button circuit of any one side, described button circuit comprises some function buttons 2 and mistake proofing key 3, and described function button 2 and mistake proofing key 3 are single-stage button.

Film bulk 1 material is insulating material, as paper, polyester, glass or PET.

Do knee-action because capacitive sensing technology does not need face paste layer button position, the material ranges of face paste layer is more extensive than prior art scheme, can be thin, thick plastic film, goes back other insulating material such as useable glass.If subscriber equipment uses nonmetal casing, adopt this programme, can paste by not use face, keypress function pattern is directly printed or mold pressing, be engraved on casing, at the fixing this programme printed substrate in the reverse side relevant position of casing.(this programme also can be imprinted on function pattern on wiring board, makes face paste layer and line layer share same material)

Button circuit material is conductive carbon paste, as one or more mixtures of copper, aluminium, carbon, silver.

The present invention adopts touch control technology, and switch does not need physical deformation, so the breakage of can not rupturing.This technology requires than low many of prior art electric conducting material resistance, same wire, and 10cm is long, prior art Standard General requires in resistance 50 Europe mothers, and this technical requirement is low, and 5000 Europe mothers can work with interior, like this, electrically conductive ink just can use high resistance ink, (can use copper, aluminium, carbon, silver-colored carbon, copper carbon, aluminium carbon etc.) because other electrically conductive ink chemical property do not have silver active, avoid the incipient fault that uses silver to bring.So the technical program has been got rid of a large amount of potential faults from source.

In practical application, on a switchboard, there are several function keys, each function key connects one derives line, button and derive line with electrically conductive ink printing in the circuit board, because the present invention adopts capacitive sensing technology, when finger touch is to non-button position, if just in time having button to derive line below passes through, also have capacitance variations, may cause false judgment, for anti-phenomenon here, the present invention has designed a mistake proofing key, mistake proofing key is also monopolar line, derive by a lead-out wire, all the other working portions are electrically conductive ink printed patterns, cover the position that likely causes erroneous judgement, not covering function button position, mistake proofing key and other function key gradation printing, between mistake proofing key printed layers and function key printed layers, print one deck dielectric ink, (the mistake proofing utmost point also can be printed on the other one side of film circuit board, or be imprinted on separately on other layer materials) in a word, ensure mistake proofing key and other function keys Shi Bu UNICOM.In the time that mistake proofing key senses capacitance variations, touch chip module and judge as invalid touch.

Beneficial effect of the present invention:

(1) long-life: the technical program does not have fatigue of materials, chemometamorphism, is long-life design.

(2) low cost: prior art is got rid of non-drying glue layer, generally has 4-5 layer material, and the technical program is 1-2 layer material only, has replaced a large amount of metal clipss, particularly noble silver, material cost 50%-80%; Prior art number of layers is many, and assembling is complicated, metal clips special charges is installed artificial, wants perforate on spacer, fluting, and contraposition, face sticks wants belling to rise, and the technical program is simple in structure, as long as paste assembling, cost of labor reduces more than 50%.

(3) environmental protection: the technical program is used material few, reduce the plastics consumption of 50%-80%, particularly, reduce the use of a large amount of adhesive stickers, and then these secondary pollution of these materials to environment are reduced, the technical program further even can be used paper material manufacture, can further reduce environmental pollution.

Embodiment recited above is described the preferred embodiment of the present invention; not scope of the present invention is limited; design under the prerequisite of spirit not departing from the present invention; various distortion and improvement that the common engineers and technicians in this area make technical scheme of the present invention, all should fall in the definite protection range of claims of the present invention.

Claims

1. a thin film switch, it is characterized in that: comprise film bulk (1) and be printed in described film bulk (1) tow sides or the button circuit of any one side, described button circuit comprises some function buttons (2) and mistake proofing key (3), and described function button (2) and mistake proofing key (3) are single-stage button.

2. thin film switch as claimed in claim 1, is characterized in that, described film bulk (1) material is insulating material.

3. thin film switch as claimed in claim 1, is characterized in that, described button circuit material is conductive carbon paste.

4. thin film switch as claimed in claim 2, is characterized in that, described insulating material is paper, polyester, glass or PET.

5. thin film switch as claimed in claim 3, is characterized in that, described conductive carbon paste is one or more mixtures of copper, aluminium, carbon, silver.