Keyboard Technology Write For Us: Computer keyboard technology includes many elements. Many key technologies have been developed to meet consumer needs and optimized for industrial applications. A full-size (100%) computer alphanumeric keyboard typically uses between 101 and 105 keys; built-in keyboards in laptops tend to be less comprehensive.
Virtual keyboards, primarily accessed through a touchscreen interface, have no physical switches and deliver artificial audio and haptic feedback. This type of keyboard can be helpful because the rigid nature of physical computer keyboards does not limit it.
Most modern keyboards include a control computer and indicator lights to offer feedback to the user (and the CPU) about the state of the keyboard. Plug-and-play technology means its “ready” design can be notified to the system, creating the keyboard immediately ready for use without further configuration unless the user desires. This also enables the production of universal keyboards for different language markets that differ only in the characters engraved on the keys.
Keystroke sensing
Membrane
A typical membrane design consists of three layers. The top and bottom layers have exposed electrical matrix tracks, and the middle layer is a space that prevents current from flowing passively through the top and bottom conductive tracks. When pressure is applied to the top membrane, it closes the top and bottom conductive pads, allowing current to be transmitted.
The two most common types of membrane keyboards include full-throw rubber membrane keyboards and flat membrane keyboards. Flat membrane keyboards are commonly found on microwave ovens or photocopiers.
Rubber Dome Over Membrane
Full membrane travel rubber dome keyboards are today’s most common keyboard design. These keyboards place a rubber dome sheet on the membranes, ensuring the domes align with the pads. The rubber dome does double duty: it acts as a tactile return spring and provides a smooth surface to transfer force to the upper diaphragm.
Rubber dome membrane keyboards became very popular with computer manufacturers as they sought to reduce costs while PC prices fell.
Flat-Panel Membrane
Flat membrane valves are often used in harsh environments where protection against water or leakage is desired. They can have non-tactile keys, poly-dome tactile, and metal dome tactile.
When the hard poly dome is pressed, the conductive ink at the back of the poly dome connects to the underlying circuit layer. Metal dome switches are entirely stainless steel, providing increased strength and reliability. They can be customized with a custom dome design. Non-tactile flat membrane keyboards have little to no keystroke feel and often emit a beep or flash of light when pressed.
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