US Patent 9933858 Keyboard operated with two thumbs and key layout method thereof

The present invention discloses a keyboard and a key layout method. When an operator holds the keyboard with both hands, thumbs of a left and right hands cannot touch a middle position of the keyboard, the keyboard has at least three rows of keys and more than five keys arranged in each row, and widths of all the keys arranged on a middle line of the keyboard are all greater than a width exceeding a touchable range of the thumbs of both hands in a keyboard width; widths of a left side key and a right side key arranged closest to the middle line of the keyboard are greater than a half of the width exceeding the touchable range of the thumbs of both hands in the keyboard width. All the keys in the keyboard are respectively located at positions touched by the left and right thumbs.