Round & Double Radius Domes

Our round and double radius domes are essentially designed for applications where space and height are critical.
Nicomatic offers round & double radius domes that are available with or without micro dimple or multiple dimples. Given their geometry these domes are more robust to overload, overstroke & sweetspot tests. Their small diameter & shape make them ideal for consumer electronics applications, and every man/machine interface of small size (calculators, GPS systems, PC mouse, joysticks, automotive…).
The double radius version allows to save even more space vs. the round.

General features:

  • Packaging in bulk or on array
  • Material: stainless steel with nickel plating
  • Temperature of use: -40°C to +105°C
  • Switching voltage: 0.1 to 100 V
  • Switching current 0.005 to 100 ma DC / Power at 1 Watt
  • Contact resistance < 100 mOhm
  • 2 available diameters: 4 & 5mm
  • Activation forces from 150g to 220g (1.5N to 2.2N)
  • High Tactile feel (click ratio 30%% - 70%)
  • Life time up to 5M actuations

This is called sweet spot. It can vary depending on the dome size and criteria (click ratio -trip force). Main figures are:
N4 = 0.3-0.5mm
N5 = 0.5-08 mm
N6 =1mm
N8.4 =1.5mm
N12.2= 2.5-3mm
Good to know: the more the actuator is centred the best tactile and life expectancy you get.

Gold electrolytic is recommanded, but tin plated or screened silver ink can be used.

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