Mouse function
Based on Accelerometer, Gyroscope and Magnetometer with sensor fusion software. Pointing to the screen is being tracked. Actually, relative movements are being tracked, so actually pointing to the screen is not required. These can be relative moves from any preferred arm positions.
Different sensitivity levels are possible. Lower sensitivity for more accurate moves. Both hands have cursor control functionality, allowing for hand specific sensitivity. This also makes multi-touch possible. In addition, calibrations will be avoided by using self-learning algorithms.
Finger positions
The position where a finger touches a key is very important. A natural position and a natural angle are important. These positions are different depending on the grip of the hand, typically leading to a bit of a staircase.
In addition, not all positions are ideal for typing. The more extreme positions: max stretched hand and the max grasping hand are less ideal than the finger grip position. This is where fingers have most strength and most endurance, this is most healthy for long term usage.
This explains the challenge: you want keys close to each other - near the finger grip position - at the same time you can't get too close because fingers will make contact with other keys at the same time. This is where the Twin Key comes in.
The Twin Key allows the placement of 2 keys next to each other, without requiring an isolation area in between (to prevent contacting 2 fingers at the same time). This means that fingers can be more near the optimal finger grip position. This is good for all fingers and especially good for the little finger.
Mechanical keys
Typing implies millions of key strokes. Here fingers are typically strong in the grip direction, weak in the opposite direction. When compared to tapping on a surface, a key spring works as a shockbreaker during a key press (strong direction) and as support when releasing (weak direction).
On a keyboard, typically space is reserved between two keys to prevent pressing two keys at the same time. As a consequence, there is a 2cm distance between the hearts of two keys. Setting up the keyboard with these margins would lead to a distance of 4cm between the nearest and furthest key, The Twin Key reduces this by ±30%. This way it becomes much easier to stay away from the 'max reach' position and the 'hand grasp' position. It also reduces finger travel between keys.
The twin key is:
• One stem
• Two key positions
Better for health, better for performance
Putting on/off
There is a clip between strap and device (spring wire steel). When the hand is out: spring moves to the outside and keeps the strap away from the palm support, leaving room to slide in again. At the same time, having a more rigid construction in the direction of the hand sliding in/out. Being able to easily put it on/off is crucial for a 2-handed device.
