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2. Keyboard technology - Wikipedia

   en.wikipedia.org/wiki/Keyboard_technology

   Most commonly the emitters and sensors are located at the perimeter, mounted on a small PCB. The light is directed from side to side of the keyboard interior, and it can only be blocked by the actuated keys. Most optical keyboards require at least two beams (most commonly a vertical beam and a horizontal beam) to determine the actuated key.

3. Maltron - Wikipedia

   en.wikipedia.org/wiki/Maltron

   Maltron keyboards became well known in the 1980s and 1990s for their distinctive layouts. Hackaday described the Maltron keyboard as "a mass of injection-moulded plastic with two deep dishes for all the keys." [3] Tom's Hardware said that the keyboards were "one of the real first ergonomic, split keyboard to use keywells. Designed for people ...

4. Keycap - Wikipedia

   en.wikipedia.org/wiki/Keycap

   This is commonly used for keyboard casings and keys. It is a comparatively soft material compared to some modern plastics but is tough and resistant to breakage. Topre casings are made of ABS and IBM Model Ms are as well. Filco and Das keys are made of ABS, as are most keys that ship with computer keyboards. It has a bit of a "slick" feeling.

5. Ergonomic keyboard - Wikipedia

   en.wikipedia.org/wiki/Ergonomic_keyboard

   Conventional keyboards include feet that can be deployed under the top of the keyboard, which generates a positive slope: the topmost rows (F1– F12 function keys) are higher than the bottom rows (space), which would require the user to tilt their wrists up. Ergonomic keyboards may use a riser under the front to create a neutral or negative ...

6. Microsoft ergonomic keyboards - Wikipedia

   en.wikipedia.org/wiki/Microsoft_ergonomic_keyboards

   In general, ergonomic keyboards are designed to keep the user's arms and wrists in a near-neutral position, which means the slant angle (the lateral rotation angle for the keys in each half relative to the axis of the home row in a conventional keyboard) is approximately 10 to 12.5°, the slope (the angle of the keytop surfaces starting from the front edge closer to the user towards the top of ...

7. Computer keyboard - Wikipedia

   en.wikipedia.org/wiki/Computer_keyboard

   Most commonly the emitters and sensors are located in the perimeter, mounted on a small PCB. The light is directed from side to side of the keyboard interior and it can only be blocked by the actuated keys. Most optical keyboards [21] require at least 2 beams (most commonly vertical beam and horizontal beam) to determine the actuated key. Some ...