When it comes to membrane switches, I think most of them are no stranger to it. If you have an induction cooker at home, then you should know how the membrane switch is. Membrane switches have a wide range of applications, in addition to some household appliances, but also, for example, medical, automotive and other industries, such as children's favorite smart toys and so on. Compared with the general switch, membrane switch has a lot of advantages, moisture, safety, long life, etc.. Next I will carefully introduce to you some of the parameters of the membrane switch information.
Membrane switch, also known as the light touch keyboard, using a flat multi-layer combination of the overall sealing structure, is the key switch, panel, marking, symbols, display and liner sealing in a set of optical, mechanical and electrical integration of a new electronic components, is a fundamental change in the appearance of electronic products, it can replace the conventional discrete components of the keys, more reliable implementation of the operating system tasks.
Membrane switch has a good waterproof, dustproof, oil-proof, anti-hazardous gas erosion, stable and reliable performance, light weight, small size, long life, easy to install and connect, the panel can be washed and the characters are not damaged, colorful, beautiful and generous advantages. The use of membrane switches make your products more contemporary. Membrane switch main types of membrane switch panel is a rigid or flexible printed circuit board as a substrate, installed on the feel or no feel keys, and then coated with plastic (polycarbonate PC, polyester PET, etc.) printed with colorful decorative patterns of film panels composed of a set of switching and decorative functions as one of the electronic components, is a new type of man-machine dialogue interface. The connection between its switch circuit and the whole machine can be completed by welding or plugging.
The thickness of the plastic substrate in 0.25mm and the following is called film, mainly used as a membrane switch panel layer, the back of which is printed with a variety of indicative patterns, text to indicate the corresponding switch key position of the operating area, the thickness of the selection should be based on the size of the panel and the keys, the material is thick, the touch force increases, the reaction is slow; material is too thin, touch the feel is poor, rebound is not obvious. Thickness of 0.25mm or more called plate, not suitable for three-dimensional key molding, can be used as a keyless operation area of the indicative signage panel, can also be used as a membrane switch liner to improve its hardness.
Line layer printing material:
The substrate for making circuits should be polyester (polyethylene terephthalate) film (Potyester abbreviated as PET). It has good insulation and heat resistance, with high mechanical strength, transparency and airtightness, especially with folding resistance and high elasticity, is the ideal material for making membrane switch circuit.
One, the panel layer
Panel layer is generally lower than 0.25MM PET, PC and other colorless translucent sheet screen printing on the beautiful patterns and text production and become, because the panel layer of the most important role is to play a role in the marking and keying, so the choice of materials must be high transparency, high ink adhesion, high elasticity, high toughness and other characteristics.
Two, surface glue layer
The main role of the surface glue is the panel layer and the circuit layer is closely linked to achieve the effect of sealing and connecting, this layer is generally required to be 0.05 - 0.15MM thickness, with a high degree of adhesion and anti-aging; in the production, the general use of special membrane switch double-sided adhesive, some membrane switch requires waterproof and high temperature, so the surface of the plastic Must also be based on the need to use different nature of the material.
Three, the control circuit on the upper and lower
This layer are used in good performance polyester film (PET) as a carrier for switching circuit graphics and screen printing on it with a special process on the conductive silver paste and conductive carbon paste, so that it has conductive properties, and its thickness is generally in the 0.05 - 0.175MM within the most common is to use the 0.125MM?PET.
Four, laminated layer
It is in the upper circuit and the lower circuit layer and play a role in sealing and connecting, generally using PET double-sided tape, the thickness of 0.05 - 0.2MM varies;? In the selection of this layer of material should be given full consideration to the overall thickness of the product, insulation, circuit button package feel and sealing.
Fifth, the back of the adhesive layer
The use of adhesive backing and membrane switch with what material is closely related to the paste, the more commonly used ordinary double-sided tape, 3M adhesive, waterproof adhesive and so on.
Membrane switch structure classification:
1) flat non-tactile:
Long service life, but no sense of touch;
2) film convex tactile:
Good sense of touch, but the service life is relatively short;
3) convex frame non-tactile:
Aesthetically pleasing. p>
Beautiful appearance, strong sense of three-dimensionality, but no sense of touch;
4)? Convex bezel tactile type:
Beautiful appearance, a strong sense of three-dimensionality, and tactile;
5) face plate convex tactile type:
Type (a): when the design is not appropriate, easy to have the phenomenon of the two segments, but the face plate is broken, the electrical performance also exists;
Type (b): the phenomenon of the two segments does not exist and the structure of the layer is less economical, if the face plate broken, the electrical performance will not exist;
Type (b): there is no two-segment phenomenon, and fewer layers of the structure, the economy, and the electrical performance will not exist;
The face plate breaks.
6) metal shrapnel type:
(a) type: the most basic and most commonly used structure. Shrapnel plays both the role of touch and the role of the upper line;
(b) type: complex structure, used for more dense shrapnel and do not have to jump the line of the occasion.? Shrapnel placed on the upper line, the upper and lower lines of the conductive surface are up, the upper line needs to be punched. This structure conductive shrapnel four feet and the center point is not in the same plane, there are "two sections" of the situation. At the same time, the shrapnel is often in the excessive anti-concave state, over time, the shrapnel will not rebound phenomenon, is not recommended;
(c) type: the shrapnel is placed in the upper line, only to play a tactile role, the conductive side of its upper line down, the conductive side of the lower line up, there are "two segments" of the situation, is not recommended;
(d) type: shrapnel placed in the lower line, the upper and lower lines are aligned, the shrapnel both play a tactile role and play a role in the upper and lower lines are connected; used for more shrapnel, denser and do not have a jumper occasions, simpler than the structure of the (b) type. Designed to pay attention to line alignment to avoid the four legs of the shrapnel to ensure that there is no short circuit.
7) light-emitting body type: be sure to open the bottom rubber mold;
(a) led line and the lower line of the same layer: simple structure, but if the selected LED lamp height is high, the LED lamp will be topped up the panel, at this time should be the panel of the LED window to do convex processing, or thicken the thickness of the surface adhesive layer, so that the thickness of its thickness is greater than that of the LED lamp;
(b)? LED line and the lower line of different layers: the structure is complex, but the LED window does not have to be convex, but must be hollowed out in the area above the LED light to prevent light can not pass through the LED light hole. Note: At this time, the lower line alignment needs to be avoided around the LED light hole alignment.
8)Folding type:
This type can be avoided to avoid jumping lines and do not need to make the conductive surface of the hole can be down, the disadvantage of this structure in the folded easily line is easy to break.
9) inside and outside the frame waterproof type:
Outside the frame is a closed frame, there is no line, on the inner frame to play a protective role, to prevent moisture from the line groove into the chassis.
Be careful with the substrate voltage: 2kV(DC)
Selected rebound time: ≤6ms
Borrow circuit resistance: 50Ω, 150Ω, 350Ω three grades, or determined by the user's needs.
Insulating ink resistance: 100V/DC
Mechanical Properties
1 ⒈ Reliability Life: >1,000,000 cycles
Peak Closing Displacement: 0.1 to 0.4mm (non-tactile)?0.4 to 1.0mm (tactile)
Mechanical properties
Life: 15 to 750gf
Mechanical properties
Mechanical properties 15~750g force
Sung conductive silver paste migration: in 55 ℃, temperature 90%, 56 hours, between the two lines of 10MΩ/50VDC
Careful of the silver paste line on the oxidation, no impurities
Selective silver paste line width of ≥ 0.3mm, the minimum interval of 0.3mm, the line of rough edges & lt; 1/3, line gap & lt; 1/4 line width
Selective silver paste line width ≥ 0.3mm, minimum spacing 0.3mm, line burr & lt; 1/3, line notch & lt; 1/4 line width
Borrow p>
Borrow pin spacing standard ?2.54?2.50?1.27?1.25?1.0?0.5mm
Lead out line curvature, rolled on a d=10mm steel rod for 80 times without stopping the line.
Environmental properties
⒈ Working temperature: -20 ° C to +70 ° C
⒉ Storage temperature: -40 ° C to +85 ° C? Temperature 95%±5%
Da? Air pressure: 86～106KP Pressure: 86 ~ 106KPa
Printing indicators
⒈ printing size deviation ± 0.10mm, the appearance of the edge of the line is not clear braid difference ± 0.1mm
⒉set of color deviation ± 0.11mm/100mm, insulating ink all over the line of silver paste
⑶ no ink scatter, the characters have no No ink scattering, no defective handwriting
S⒋ color difference is not greater than two
Careful not to have crease, paint removal
Choose the transparent window transparent and clean, color and luster uniformity, there shall be no scratches, pinholes, impurities.
For the maintenance personnel, some old equipment in the match can not be used in the original machine membrane switch, you can record the key corresponding to the line number, and then use the general button (light touch switch) plus group line way to replace. The effect is exactly the same, but more trouble!
There is a lot of information on the parameters of the membrane switch, and I only summarize some of the more common, need special attention to the parameter information, I hope to provide you with some substantial help. Also want to remind you of a few points: membrane switch between the layer of film to be retained, can not be torn off, in case the switch fails; in the preservation of the surrounding environment should also pay special attention to whether dry, whether clean; in the bundle of membrane switch, be sure to pay attention to the mastery of the degree of elasticity. Finally, I also hope that the membrane switch can give you and your family to bring a different kind of happiness.
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