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New Information

Basic characteristics and basic principles of membrane switches

From:admin Date: 2020-07-13
Foreword: Membrane switch sounds very technical and professional. In fact, the simple one is the panel switch function key. Such a name is well understood. Many mechanical equipment control panels use membrane switches, which are commonly used in electronic devices, communications, electronics Testing industries such as experimental instruments, industrial control systems, medical equipment, machinery manufacturing, electric toys, and electrical products. The old saying goes: It is useful to know why it is learned. Below I will study the basic characteristics and basic principles of the membrane switch with you.
1. Introduction to the basic principle of panel membrane switch
Membrane switch is a double-layer characteristic (plan view) type (non-locking) light touch switch composed of a certain elastic insulating material layer, which integrates function keys, marked components, and laboratory instrument panel switches. The key switch's own motion is only maintained according to the vertical fitness movement of the elastic membrane switch. The elastic membrane switch experiences millions of bowel movements. The total width of the bowel movement is only 0.1-0.3MM. The material selection is effective, so the membrane switch The material's long life span of millions of times or so, without deformation, determines the critical durability of the film.
Membrane switch buttons have beautiful appearance, long life, simple features, easy installation, happy application, small area and other characteristics. They are widely used in every manufacturing industry, from electrical appliances and high-tech new products, gradually replacing part of the power supply. The sales market of switches occupies a large proportion in the sales market.
2. The key features and basic structure of the film
In general, the key of the common membrane switch is composed of 6 layers of materials, in order from the table to the inside are the panel switch, the surface glue, the upper power circuit, the protective layer, the lower power circuit, and the bottom glue. The characteristics of each layer are detailed below:
1) Panel switch: The panel switch is the "jacket" of all membrane switches. Basically, the function keys are properly allocated. According to the different colors, patterns, and function key shapes, all membrane switches have the necessary decorative design effects. The most important function of the laminated glass layer is the function of the logo and keys, so the selected materials must have high definition, high printing ink adhesion, high elasticity, and fracture resistance.
2) Upper power circuit, lower power circuit: The upper and lower power circuits are a part of the household appliances of the membrane switch, and they belong to the "off" and "key" of the power switch. Their characteristics immediately endanger the quality of the electrical switch. The key It is produced by printing a layer of conductive material on the membrane switch. The left and right power circuits are responsible for the two electric shock accidents required to turn off the power switch. Their thickness is generally within 0.05--0.175MM, and the most common is 0.125MMPET.
3) Top rubber, protective layer, bottom rubber: The three-layer material is all foam tape, because the location where the power switch is located is different but has a different name. The thickness of the three-layer double-sided adhesive is different according to the grade. The key lies in the thickness of the power switch and the work of the function keys.
3. The working principle of the basic principle of the membrane switch
The basic basic principle of the membrane switch key is that when the panel switch is not pressed, the membrane switch key is in the general situation, the left and right contact points are broken, and the cable jacket fully exerts the effect of the insulation layer on the left and right traces. When pressed, the contact point of the upper power circuit deforms downward, and merges with the lower and lower lines to make the line conductive. The conductive line signals the external connection instrument (substrate) to realize its corresponding switching function When the finger is released, the upper circuit contact bounces back, the circuit is disconnected, and this circuit triggers a switching signal.
After reading the above introduction, I believe you must have a better understanding of the structure and principle of the membrane switch. However, there are many related knowledges. The author has carefully selected this article about the membrane switch and hopes to play a role I hope that all friends can learn a lot, so as to deepen and strengthen the understanding of membrane switches.
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