What is membrane switch?

hqtDec 9, 2019

Membrane switch is an operating system that integrates key functions, indicator components, and instrument panels. It is composed of the panel, upper circuit, isolation layer, and lower circuit. Press the membrane switch, the contact of the upper circuit deforms downward and contacts the plate of the lower circuit. After the finger is released, the contact of the upper circuit bounces back, the circuit disconnects, and the circuit triggers a signal. Film switch structure rigorous, beautiful appearance, good sealing. It has the characteristics of damp proof and long service life. Widely used in electronic communication, electronic measurement instruments, industrial control, medical equipment, automotive industry, intelligent toys, household appliances, and other fields.

The structure of the membrane switch:

Flat type without touch: long service life, but without touch.
Film convex touch type: good touch, but relatively short service life.
Convex frame type without touch: beautiful appearance, strong three-dimensional sense, but without touch.
Convex border type: beautiful appearance, strong three-dimensional sense, and tactile.

  • The design is not appropriate, easy to have two phenomena, but the surface is damaged, the electrical performance also exists.
  • Type there are no two sections, and the structure layer is less, more economic, if the surface plate is damaged, the electrical performance will not exist.

Metal shrapnel type:

It is the most basic and commonly used structure.

Type: complicated structure, used for shrapnel more relatively close and don't have the occasion of jump line. Shrapnel in an on-line way on conductive surface under the line up, the line needs to punch the structure when the conduction shrapnel center of four feet and not in the same plane, there are two cases at the same time, the shrapnel often leads the concave strong condition, time is long, the shell will appear not rebound phenomenon, is not recommended.

shrapnel is placed on the on-line circuit, only playing the role of tactile sensation. The upper circuit conducts electricity downward and the lower circuit conducts electricity upward. If there are two sections, it is not recommended to use it.

The shrapnel is placed in the lower line, and both the upper and lower lines are wired. The shrapnel not only ACTS as a sense of touch but also connects the upper and lower lines. For the occasions where shrapnel is denser and there is no jumper, it is necessary to pay attention to the line routing to avoid the four legs of shrapnel in the simple design of the structure, so as to ensure no short circuit.

Luminous shape: the bottom rubber mold must be opened.

The LED line is on the same floor as the lower line: the structure is simple, but if the selected LED lamp has a high height, the LED lamp will jack up the panel. At this point, the LED window on the panel should be convex, or the thickness of the adhesive layer should be thickened to make the thickness greater than that of the LED lamp.

The LED line and the line of different layers: the structure is complex, but the LED Windows doesn't have to hit convex, but the top of the LED lights area must be hollowed out, prevent light could not through-hole LEDs.

Note: at this point the line goes line must be LED lights around the hole to avoid going.

For folding: this type can avoid jumper wire and don't need to be more square holes can make the conductive surface can be down, the disadvantage of this structure in the folded easy line break.

Inside and outside the box waterproof type: The outer frame is a closed frame with no wiring. The inner frame has a protective effect to prevent water vapor from entering the casing from the outlet groove.