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Design Considerations

The following recommendations are presented as a general guideline. GGI will assist you and ensure all critical parameters are respected in order to achieve the desired end result.

  1. Minimum distance between the keys: 4mm (0.157")
  2. Minimum distance between the actuation webs : 1mm (0.3937")
  3. Minimum distance between any feature on the keypad : 1mm (0.3937")
  4. Minimum distance between any feature and the edge of the keypad : 1mm (0.3937")
  5. Minimum gap between the edge of the key and the key opening in the bezel. : 0.3mm (0.012")
  6. The bottom of the bezel should incorporate a 45 degree chamfer to make certain that the actuation web of the switch is not obstructed.
  7. If possible, some mounting features should be included to ease assembly
  8. All keys require air channels for proper venting : 1.5mm wide x 0.3mm deep minimum
  9. Keys should be vented on at least two sides
  10. Maximum key top curvature for concave or convex keys : 0.5mm (0.020")

  11. Dimensional Tolerance (mm / inch).
    L<10 10<L<20 20<L<40 40<L<63 63<L<100 100<L<160 160<L
    ±0.10 ±0.15 ±0.20 ±0.25 ±0.35 ±0.40 ±0.3%
    L<0.394 0.394<L<0.787 0.787<L<1.575 1.575<L<2.480 2.480<L<3.938 3.938<L<6.300 6.300<L
    ±0.004" ±0.006" ±0.008" ±0.010" ±0.014" ±0.016" ±0.3%

Design consideration note: In the case where the design of the keys is made with a flat web design rather than with a 45° web design, some of the constraints may disappear or can be adjusted. For example, in this case the constraint f) disappears.

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