How many types of membrane switch structures are there?

There are four types of membrane switch structures

1. Flexible membrane switch

Flexible membrane switch is a common type of membrane switch. This type of membrane switch is called flexible because its graphic overlay, isolation layer, and circuit layer are all composed of flexible films with different properties. The circuit layer of the flexible membrane switch uses polyester film (PET OR FPC) with good electrical performance as the conductor of the switch circuit pattern. This layer is also divided into a hand-feeling metal dome and upper and lower circuits. Due to the influence of the properties of the polyester film, the membrane switch has good insulation, heat resistance, flexural resistance and high resilience. The graphics of the switch circuit, including the connection of the switch and its lead wires, are printed with low resistance, conductive paint that cures under low temperature conditions. Therefore, the composition of the entire membrane switch has a certain degree of 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 connection of the group switch, it is gathered in a certain part of the membrane and extended outward according to the designated position and standard line distance of the design as a soft , The arbitrarily bendable and sealed lead wire is connected to the rear circuit of the complete machine.

2. Rigid membrane switch

Rigid membrane switch means that the graphics and circuits of the switch are made on a common printed circuit (PCB) copper clad board. Rigid membrane switches are characterized by easy access to materials, stable process, low resistance, and some components in the circuit can be welded directly on the back of the switch. In the case of a small area, the hard liner layer can be omitted. Rigid membrane switches generally use metal guides as conductive contacts, so they have a better feel. The disadvantage is that there is no flexible membrane switch in the whole machine, which is often necessary to weld and lead 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 handle shrapnel.

3. Plane membrane switch

The buttons on the membrane switch are different in color to indicate the position, shape and size of the key body, which is more common in the initial stage of the membrane switch. Flat membrane switch: Usually the buttons on the membrane switch only 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 pressed in the effective range of the switch to make the switch act, it affects the confidence in the whole machine monitoring and the speed of operation. A kind of membrane switch that makes the switch key body slightly protrude, slightly higher than the panel to form a three-dimensional shape, 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, make the operator's touch more sensitive, but also enhance the decorative effect of the product appearance. The production of the three-dimensional key.

4. Embossed membrane switch keypad

Usually the buttons on the membrane switch only use colors 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 with process holes to facilitate accurate positioning during mold embossing. Generally, the height of the three-dimensional embossing should not exceed twice the thickness of the substrate. For the beautiful appearance of the product, the embossed membrane switch can be made in many variations.