Membrane switch is an operating system that integrates key functions, indicating elements and instrument panels. It consists of four parts: panel, upper circuit, isolation layer and lower circuit. When the membrane switch is pressed, the contacts of the upper circuit are deformed downward, and are in contact with the pole plate of the lower circuit. After the finger is released, the contacts of the upper circuit bounce back, the circuit is disconnected, and the circuit triggers a signal. The membrane switch has strict structure, beautiful appearance and good sealing performance. It has the characteristics of moisture resistance and long service life. Widely used in electronic communication, electronic measuring instruments, industrial control, medical equipment, automobile industry, smart toys, household appliances and other fields. Specific type flexible film membrane switch Flexible membrane switches are a typical form of membrane switches. The reason why this type of membrane switch is called flexible is because the mask layer, isolation layer and circuit layer of the membrane switch are all composed of flexible films of various properties. The circuit layer of the flexible membrane switch adopts polyester film (PET) with good electrical performance as the carrier of the switch circuit pattern. This layer is also divided into feel shrapnel and upper and lower circuits. Due to the influence of the properties of the polyester film, the membrane switch has good insulation, heat resistance, folding resistance and high resilience. The graphics of the switch circuit, including the connection of the switch and its outgoing wires, are printed with low-resistance, low-temperature-cured conductive paint. Therefore, the composition of the entire membrane switch has a certain flexibility, which is not only suitable for use on a flat body, but also can be matched with a curved body. The lead wire of the flexible membrane switch is integrated with the switch body itself. When making the online connection of the group switch, it is collected in a certain place on the membrane, and extends outward according to the position specified by the design and the standard line spacing, as a flexible membrane switch. , Freely bendable and sealed lead wires are connected to the rear circuit of the whole machine. Hard film Rigid Membrane Switch Rigid membrane switch means that the graphics and circuits of the switch are made on a common printed circuit copper clad laminate. The rigid membrane switch is characterized by convenient material selection, stable process, low resistance, and some components in the circuit can be directly welded on its back. In the case of small area, the hard backing layer can waterproof membrane switch be omitted. Rigid membrane switches generally use metal guides as conducting labyrinth contacts, so they have a better feel. The disadvantage is that it is not as convenient as a flexible membrane switch to install and connect in the whole machine, and it is often necessary to weld and lead out the lead through a flat cable. In addition to the buzzer signal and LED indication, the information feedback of the rigid membrane switch can generally use metal shrapnel. Flat film Flat Membrane Switch The keys on the membrane switch use different colors to indicate the position, shape and size of the key body, which are more common in the initial stage of the membrane switch. Three-dimensional membrane switch: Usually, the keys on the membrane switch just use color to express the position, shape and size of the key body. In this way, the accuracy of the operation can only be recognized by the operator's vision. Since there is no appropriate feedback information to indicate whether the finger is in the effective range of the switch to make the switch move, the confidence in monitoring the whole machine and the speed of operation are affected. A type of membrane switch that makes the switch key slightly protrude and is slightly higher than the panel to form a three-dimensional shape, which is called a three-dimensional key switch. The three-dimensional key can not only accurately specify the range of the key body, improve the recognition speed, and make the operator's touch more sensitive, but also enhance the decorative effect of the product appearance. The production of the three-dimensional key. Raised film Raised membrane switch Usually, the keys on the membrane switch just use color to express the position, shape and size of the key body. In this way, the accuracy of the operation can only be recognized by the operator's vision. Since there is no appropriate feedback information, the confidence in the monitoring of the machine and the speed of the operation are affected. Therefore, in the design stage of the panel, it is necessary to make arrangements and prepare process holes for accurate positioning when the mold is pressed. Generally, the height of the three-dimensional protrusion should not exceed twice the thickness of the substrate. In order to make the appearance of the product beautiful, the protrusions of the raised membrane switch can be made in various variations.
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