Editing Membrane keyboard (section)

====Hammer over membrane====
Spring-over-membrane switches provide a smooth increase in force against the membrane. Hammer-over-membrane designs strike the membrane instead. The term is something of a misnomer, as it is typically used to refer to [[IBM buckling spring]] switches, which use a small flat paddle to provide the impact. The [[Acer switch]] however concentrates the force into a small circular area on the end of a pivoting bar, which holds the bottom end of the return spring. The exact specifics of the operation have not been studied.

See: [[:Category:Hammer-over-membrane switches|Hammer-over-membrane switches]]

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Is this really a membrane keyboard, or just a switch mechanism that is built on a membrane?

===Conductive actuation===
Conductive actuation involves a single membrane sheet with pairs of exposed pads. A conductive object is brought down by each key to bridge these pads. This can be a rubber dome or, in the case of Mitsumi keyboards, a rubber foot.

<gallery widths=250 heights=187>
File:Apple Keyboard II Mitsumi opened.jpg                | Mitsumi-made [[Apple Keyboard II]] keyboard opened up
File:Apple Keyboard II Mitsumi layers.jpg                | The base, rigid metal membrane backplate, and single membrane layer
File:Apple Keyboard II Mitsumi key system rear.jpg       | Rear of the switch assembly, showing the conductive feet on the sliders
</gallery>
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