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Membrane Keyboard Design Guide

  • Membrane Keyboard Design Guide

The DiamondHMI Membrane Keypad Design guide is intended as an outline for communicating the membrane keyboard design requirements of our customers.

Covering areas such as the artwork design, embossing, force/travel considerations and key elements that need to be included when preparing CAD drawings, our Membrane Keypad Design guide gives designers an overview of all the elements that must be considered when specifying a membrane keyboard design.

Our own UK design team are available to support you at any point in the process from simple concept discussions to detailed considerations of membrane keypad design.

Please contact us via our web form or on +44(0)1477 505206 to discuss your project in detail.

Membrane Keyboard Technology Guide Sample
Embossing

In many applications it is desirable to emboss the keys of a switch. The phrase “Pillow Embossing” is used to describe keys that are raised and flat on the top. This is most commonly used with metal domes. “Rim Embossing” is used to describe only the border of a key being raised and is frequently used in non-tactile applications but not limited to . “Dome Embossing” is when the button is formed into a raised circular dome shape.

Mechanical Tolerances

Steel rule dies are normally used to fabricate the various layers of a membrane switch. Standard tolerances should be +/- 0.381 mm (.015”). Tolerances of +/- .254 mm (.010”) can be held on critical dimensions such as the perimeter or cut-outs.

Hole centre to hole centre tolerances of +/- .127 mm (.005”) can be held. Tolerances on very large parts will be greater.

The switch layers under the overlay will typically be fabricated smaller than the overlay. This allows for die cutting and assembly tolerances. All layers will typically be inset from the overlay at all edges and cut-outs by .015 inch



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