3m Adhesive OEM SMT LEDs Membrane Switches

Product Description

3m Adhesive OEM SMT LEDs Membrane Switches


Membrane material-Polyester, polycarbonate and polyurethane typically make up the components of a membrane switch panel. 

Internally, the switching mechanisms are via metal domes or conductive shorting pads. 

Further enhancements include surface mount LEDs, water clear widows, dead fronts, back-lighting with optic fibre or electroluminescence and solid mounting plates. 

Terminations to the PCB can be via Berg connectors and Nicomatic connectors or designed to fit Zif connectors.


Some Variables need to pay attention when design membrane keypad

The following provide insight into the considerations that need to allowed for at the initial stages of design. 

As the concept develops and moves towards completion it is important to talk to experts that have a strong understanding of the variables and what impact they have on the overall product.


These following points are an example of the further considerations that should be considered and talked through with the design and sales team at Kaike Technology


  • Graphic overlay material options – textures, types and thickness


  • Graphic design and preparation – impact of colours, tones, windows, borders, embossing and shapes • Embossing options – shapes, depth and purpose


  • Layouts and tolerances – LED windows, gaps between LEDs, tracking and buttons. Edge shape, cutout size and hole size requirements.


  • Overall size of the part – material cost considerations


  • Tooling methods – laser cutting vs die cutting, embossing tool styles


  • Backlight options – Lumitex optic fibre, Electroluminescence, EL solutions


  • Embedding LEDs – types, size and electrical requirements. Change in overall thickness and how to manage


  • Clarity of any windows and impact on graphic material specifications – gloss stock with matt varnish vs textured stock with gloss varnish over windows


  • Membrane switch design – tracking layout, crossover requirements, pin out considerations, electrical specifications, tail length and positioning, connector type, electrical parameters, resistance tolerances


  • Moisture resistance and environmental considerations – gasket seals, adhesive types, environmental limitations (temperature, humidity, air pressure)


  • Tactile options – Metal domes, poly domes, raised surface printing, embossing.


  • Metal domes – sizes, shapes, force levels, durability considerations


  • Connector interface – pitch of tracking, resistance level of conductive silver, pin out assignment • Electrical layout and specifications – common bus vs x-y matrix, switch contact levels (under 50mA), resistance levels between 50 and 200 ohms


  • Rear adhesive selection – surface energy of the material being mounted to, environmental (heat, humidity, air pressure) effect that can cause separation


Inquiry

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