Membrane Switch
A new type of electronic keypad operating system thatintegrates key functions, indicator components, and front panels.
The membrane switch is composed of six layers: Graphic overlay, upper-adhesive, the upper circuit, the isolation spacer, the lower circuit and the back adhesive. The contact of the upper circuit is downward, and it is in contact with the point of the lower circuit. The circuit contact bounces back after releasing, then the circuit is disconnected and the loop triggers a signal.The Membrane switch has strict structure, beautiful appearance and good sealing. It has the characteristics of moisture resistance and long service life. It has been widely used in electronic communication, electronic measuring instruments, industrial control, medical equipment, automotive industry, smart toys, household appliances and other more fields.
Working Principle of Membrane switch
The basic working principle of the membrane switch is as follows: when the keys is not pressed, the membrane switch is in the normal open state, and its upper and lower contacts are disconnected, and the isolation layer isolates the upper and lower lines; when the keys is pressed, the upper contact
point of the circuits is deformed downwards, and it merges with the lower circuit to make the circuit conductive.
The connected circuit signals of the external connection instrument (substrate) to achieve its corresponding function; when the finger is released, the upper circuit that touches the lower point will be bounced back, then the circuit is disconnected, and the loop triggers a signal.
Excellent Waterproof Process ( IP66 )
GoJGo unique waterproof technology with 3M300LSE, it is able to reach the waterproof grade of IP66 thatcan be used in humid environments.
Membrane Switch Application Fields
The membrane switch is consists of keys, front panel, text, marking, logo, transparent windows. And the design of the graphic overlay can reflect the integration of product function and original color performance,which is unique. The membrane switches are widely used in intelligent electronic measuring instruments,medical instruments, computer control, CNC machine tools, communication terminal equipment, variousindustrial and household appliances products(such as copiers, refrigerators, microwave ovens, electric fans, washing machines, electronic game machines, etc.).
Membrane Switch Technical Parameters:
The Comparison of PVC/PC/ PET
| PVC – Not supply | PC（Polycarbonate） | PET（Polyester） |
|---|---|---|
| Non-degradable | Degradable | Degradable |
| Not environmentally | Environmentally | Environmentally |
| Glossy / Transparent to opaque / Good light transmittance | Glossy / Transparent to opaque / Good light transmittance | Glossy / Transparent/ Good light transmittance |
| -10~60℃ | -30~110℃ | -20~120℃ |
| Thickness：0.175~0.5mm | Thickness：0.175~1.0mm | Thickness：0.125~0.2mm |
| It is stable to acids, alkalis and salts at room temperature. Good abrasion resistance, flame-retardant, self-extinguishing, noise reduction and shock absorption, and good electrical insulation. Poor thermal stability. 70% light transmittance, suitable for less demanding display panels, not suitable for button panels, because the texture is particularly soft, the buttons are easy to be broken by long-term use, the life is not long, and they are not resistant to aging, The material can not be degraded, not environmentally, can not withstand high temperature, It can be use at room temperature within 65 degrees. | Low water absorption, good dimensional stability, excellent bending, tensile and compressive strength, excellent heat resistance, cold resistance, electrical insulation and atmospheric aging resistance; Poor chemical resistance, poor fatigue resistance, prone to stress cracking. The general scope of application is the most extensive, except that it can meet the requirements of most membrane switch panels, Among them, the high light transmittance of glossy PC can meet the requirements of liquid crystal display windows PC matte, material, light transmittance 78%, material is softer than PET, can be bent at will, is not resistant to aging, can withstand weak acids and alkalis, and is also one of the most widely used materials on the market at this stage. (F150 is small matte), the emboseed feeling weaker than PET, the material is environmentally friendly and degradable, and it can meet export standards. | Good chemical resistance, insoluble in common organic solvents, not resistant to alkali. It has excellent mechanical properties, electrical properties, rigidity, hardness and maximum toughness of thermoplastics, low water absorption, excellent wear resistance and friction resistance, and high dimensional stability. The tensile strength is comparable to aluminum film, which is much higher than PC and PVC. F150 is imported PET frosted material with high temperature resistance and aging resistance. Even if it is frosted, the light transmittance of the material is still very high. The light transmittance of PET is 89%, making the color more vivid. It is the most ideal substrate for making membrane switch circuits. It is suitable for products with high environmental requirements or products with digital tubes. |
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