Illuminated Membrane Switch

Working principle:

The basic principle of capacitive touch sensing buttons is shown in the figure. When the human body contacts the electrode, as the human body is equivalent to a grounded capacitor, a capacitance CF is formed between the sensing electrode and a large area, and the sensing capacitance usually ranges from a few pF to several tens of pF. By utilizing this fundamental principle and building relevant circuits externally, it is possible to detect whether there is human contact with electrodes based on changes in capacitance.

Electronic Properties:

Circuit rating: 35V（DC），100mA，1W

Contact resistance: 10Ω~500Ω (vary according to length of lead-out wire and material)

Insulation resistance: 100MΩ 100V

Dielectric withstand voltage: 250V Rms (50-60Hz 1min) without breakdown and arcing after test

Contact chatter time: ≤5ms

Service life: Plane type ≥ 5 million times

Touch type: ≥ 1 million times

Mechanical Properties:

Operating pressure: Plane type: 57~284g（2~10oz）

Touch type: 170~397g（6~14oz）

Switch stroke: Plane type: 0.1~0.5mm

Touch type: 0.6~1.5mm

Environmental Parameters:

Operating temperature: Plane type (including elastic sheet): -20℃~+80℃

Tactile: -20℃~+60℃

Storage temperature: Plane type (including elastic sheet): -40℃~+80℃

Tactile: -40℃~+60℃

Humidity: 40℃,90%～95%,240 hours

Applicable industries

Instrumentation: measuring instruments, measuring instruments, medical instruments, navigation instruments, industrial instruments

Mechanical and electrical products: CNC machine tools, industrial machinery, industrial appliances

Household appliances: air conditioners, washing machines, induction cookers, microwave ovens, rice cookers, coffee machines, soybean milk machines, remote controls

Office systems: telephones, fax machines, copiers, printers, computer keyboards

Learning products: children's learning machines, reading machines, electronic pianos