Four working parameters of membrane switch keyboard

Membrane switch Electrical properties

⒈Working voltage amp;le;50V(DC)

⒉Working current amp;le;100mA

⒊Contact resistance: 0.5~10Ω

⒋Insulation resistance amp;ge;100MΩ (100V/DC)

⒌Raw material withstand voltage: 2kV (DC)

⒍Dome rebound time amp;le;6ms

⒎Loop resistance: 50Ω, 150Ω, 350Ω or resistance value according to user needs.

⒏Insulating ink withstand voltage: 100V/DC

Membrane keypad Mechanical behavior

⒈Reliability and service life gt; 1 million times

⒉Close position offset: 0.1~0.4mm (non-touch type) 0.4~1.0mm (touch type)

⒊Key standard working force: 15~750g force

⒋Migration of conductive silver paste: after 56 hours at a temperature of 55°C and a humidity of 90%, between the two wires is

10MΩ/50VDC

⒌No oxidation or impurities on the silver paste line

⒍Silver paste line width ≥ 0.3mm, minimum interval 0.3mm, circuit burrs <1/3, circuit gap <1/4 line width

⒎The standard for pin spacing of tail circuit is: 2.54mm 1.27mm 1mm 0.5mm

⒏The resistance to curvature of the tail lead wire is used to roll the circuit continuously with d=10mm steel rod for 80 times.

Membrane keyboard Environmental performance

⒈Working temperature: -20℃～+70℃

⒉Storage temperature: -40℃～+85℃ temperature 95%±5%

⒊Air pressure: 86～106KPa

Screen Printing standard

⒈Print size deviation ±0.10mm, unclear outline deviation±0.1mm

⒉Silk screen printing color deviation ± 0.11mm/100mm, the insulating ink completely covers the silver paste circuit

⒊No ink scattered, no incomplete font

⒋The color difference cannot be greater than the second level

⒌No creases, no ink drop

⒍The transparent window is transparent and clean, the color is uniform, and there should be no scratches, pinholes, and

impurities.