Block keyboard (Contoured keyboard)
The next development of the concept of dividing keyboards is a block keyboard, such as the 1977 Maltron or the newer Kinesis Advantage series. This keyboard places the keys on both sides according to the approximate width of the shoulder, the function keys in the middle to type with the thumb. This type of structure requires very little movement of the arms and wrists.
This is an example of a block keyboard
Handheld keyboard (Handheld keyboards)
This is a keyboard designed like gaming handles, which can be held on the hand instead of on a flat surface like regular keyboards. Users can walk in the room or lean back on the chair and still type normally.
Some variants of this keyboard include a trackball mouse, which allows mouse movement and typing right on the handheld keyboard.
AlphaGrip is an example of a portable keyboard
Corner split keyboard (Angle split keyboard)
Corner keyboard (also known as Klockenburg keyboard) is also quite similar to a split keyboard but the middle part is raised so that the index finger is in a position higher than the other fingers when typing. Key Ovation has created a Goldtouch industrial keyboard with a corner keyboard and is adjustable.
The corner keyboard has a higher center
Different types of ergonomic keyboards
Other ergonomics keyboards have a fixed vertical key and are aligned so that when typing, the hand will be perpendicular to the ground, thumbs up or type to allow rotation. A few keyboards that don't have the design of each key are a letter, like a keyer or keyless keyboard.
You may have seen the keyboard keyer on Stephen Hawking's talking device
Keyless keyboards have no keys
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