| 摘要 |
A plane keyboard equipped with a usual key input function and Braille input function is disclosed. The keyboard comprises a key input circuit in the form of a key matrix. In the key matrix, no two predetermined key switches of the keyboard, which are assigned as both Braille input function keys, are connected to any one of scan lines. This key input device is free from occurrence of a ghost key when a Braille input function is realized using, for example, a six-point-input system in which six keys assigned to realize the Braille input function are simultaneously operable.
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