Membranäppäimistöt

Membranäppäimistöt, often referred to as membrane keyboards, are a common type of computer input device. They function by using a pressure-sensitive membrane that registers keystrokes. Beneath the keycaps, a flexible circuit board with conductive traces is covered by a membrane layer. When a key is pressed, it pushes a small dome or plunger down, which in turn connects the conductive traces on the membrane, completing a circuit and sending a signal to the computer.

There are several variations of membrane keyboards. The most common is the "dome-switch" type, which uses silicone or rubber domes that provide tactile feedback and return the key to its original position. Another type is the "membrane scissor-switch" keyboard, often found in laptops, which uses a scissor-like mechanism to stabilize the keycap and reduce key travel. "Full membrane" keyboards, while less common for general computer use, are often seen in industrial or medical settings due to their sealed and easy-to-clean nature.

Membrane keyboards are generally quieter than mechanical keyboards, which appeals to users who prefer a less noisy typing experience. They are also typically less expensive to manufacture, making them a cost-effective choice for many devices. However, they can sometimes offer less tactile feedback and durability compared to their mechanical counterparts. The lifespan of a membrane keyboard is often measured in millions of keystrokes, though this can vary depending on the quality of the keyboard and its usage.