Rubber dome is rubber dome switch used in membrane keyboards, which is the most common switch technology in keyboards.
Rubber dome are made from silicone rubber material by compression molding or liquid silicone injection molding.Rubber dome are compressed to perfection to create a crisp tactile feeling of keyboard.There are carbon pill or conductive ink printing under rubber dome, that are pushed dome to complete a circuit.
Rubber dome is flexible, small and soft.
Rubber dome acts as a switch inside the membrane keyboard, providing resistance and tactile feedback.It is a return spring for each key.So the rubber dome actuation force is very important.
Rubber dome keyboards are typed usually.So the actuation force of the rubber dome keyboard should be low.It is about 40-90g+/-10g.
How to get a light actuation force rubber dome?
There are some factors that effect the rubber actuation force:
- Key webbing thickness.The thicker key webbing, the greater actuation force.
- Rubber dome travel.The shorter ttravel, the lower actuation force.
- Silicone rubber material rebound resilience and hardness.The quality of the material and the resilience of the rubber dome directly affect the tactile feeling.If the resilience of the rubber dome is poor, the rubber dome is not easy to bounce back, easy to cause the rubber dome stuck.
- High precision mold.Because the rubber dome actuation force should be low and light, the mold steel quality is also very important. Better mold steel material, higher precision rubber dome, not only effect the actuation force but also in rubber dome dimension.
Rubber dome which is used in laptop wireless keyboard requires low and light actuation force, 65+/-5g.
Rubber dome advantages
- It's cheap.Compared with metal dome, the price of rubber dome will be much cheaper.
- Less noise when typing.
- Have a fairly good tactile feedback.Rubber dome keyboards has a softer and more comfortable tactile feel than mechanical keyboards
- Resist leakage and corrosion because the rubber dome layer covers the critical substrate.
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Rubber dome acts as a switch inside the membrane keyboard, providing resistance and tactile feedback.It is a return spring for each key.So the rubber dome actuation force is very important.
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