Capacitive Membrane Switches:

The touch membrane switch is divided into two types, one is resistive membrane switch and one is capacitive membrane switch, according to the switch working principle. In many technologies, capacitive touch sensing technology has become the mainstream of touch sensing technology. Capacitive touch switch can make the product's appearance more beautiful. Capacitive touch switch can sense and penetrate insulating material with thickness more than 20mm, like tempered glass and PMMA, and it can accurately detects the effective touch position of finger. Capacitive touch switch's sensitivity, stability, reliability, etc. will not change due to changes in environmental conditions or long-term use, capacitive touch switch has wonderful waterproof and strong anti-interference ability.

By capacitive touch technology, the overlay materials can be very diverse and not only limited to PET or PC super thin films. For the normal membrane switch keypads, the function triggered by the mechanical buttons(metal domes or Polydome) and also the common membrane keypads only can use PET, PC film for the graphic overlay. Use a heavy force to press the buttons to make the conductive pads of the Polydome ormetal domes connected to the conductive pads on circuit layer, then become a loop circuit and occur the function. But for the capacitive touch membrane keypads or circuits, it is different. The overlay material can be thick glass, PMMA, Polycarbonate panel etc. It no longer limited to very thin film material. In addition, for the capacitive touch keypad no longer need heavy force to press buttons, you only need tiny touch the buttons, then the sensor pad can connect the circuit loop and occur the function.

Capacitive membrane switches are consist of the top cover and the bellow sensor circuit. The top cover of our capacitive membrane switches can be from 0.15mm to 5.0mm thick PMMA, PC, glass or other plates, which can cover nearly all different end market applications. The sensors on the inductive circuit can be printed on the PET film or etched on the ITO film. The different likes bellow:Item Printed Sensor ITO Etched Sensor.

Light Transparency Low(70~85%） High(90~99%）

Cost Low High

Tool Fees Low High

Key Benefits of Capacitive Switches:

1) Waterproof and easy clean;

2) Fingers light touch and non-conductive gloves touch;

3) Can be backlighting;

4) High Durability;

5) Diverse front overlay selection;

6) Friendly interface;

7) Single key or multi-keys or slider;

8) Low current needs;

Applications for Capacitive Membrane Switches/Capacitive Touch Sensors

1) Medical equipment, devices;

2) Healthcare devices;

3) Energy;

4) Computing;

5) Dirty, oil contamination, wet environment;

6) Household appliances;

7) Industrial Control;

8) Aviation and Boat;

9) Others;

Membrane switch Technical Datas:

1 Electrical Performance

(1) Operating Voltage: ≤50VD

(2) Operating Current: ≤100mA

(3) Contact Resistance: 0.5~10Ω

(4) Insulation Resistance: ≥100MΩ(100VDC)

(5) Base Material Withstand: 2kDVC

(6) Contact bounce: ≤6ms

(7) Loop Resistance: 50Ω,150Ω,350Ω or as per clients’ requirement

2 Mechanical Properties

(1) Life expectancy: >1 million times

(2) Switch stroke: 0.1-0.4mm(Flat type)0.4-1.0mm(Tactile type)

(3) Actuation force: 15~750g

(4) Flex Tail Pitch(Standard): 2.54 /2.50 /1.27/ 1.25mm

3 Environment Specification

(1) Operation Temperature: -20°C~+70°C

(2) Storage temperature: -40°C~+85°C

(3) Humidity: 40 C, 90%-95%, 240 hours

4 Printing Indicator

(1) Size Deviation: ±0.15mm

(2) Side Boundary: ≤0.1mm

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Phone:+8613715205860(Wechat)