The Diamond HMI Membrane Keyboard Design guide is designed to offer engineers who have little or no experience of membrane keyboard design an insight into the parameters they need to consider.
Our Diamond HMI Membrane Keyboard Design Guide covers areas such as the artwork design, Key styles including embossing, force/travel considerations and other key elements that need to be included when preparing CAD drawings,
The Membrane Keyboard Design Guide and additional raw material datasheets can be downloaded using the links opposite. This information will give designers an overview of all the elements that must be considered when specifying a membrane keyboard design.
Our own UK Membrane Keyboard design team are available to support you at any point in the process from simple concept discussions to detailed considerations of membrane keypad design.
See sample information from our Design Guide below
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.
Steel rule dies are normally used to fabricate the various layers of a membrane switch. Standard tolerances should be +/- 0.38
1 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