Keyboard

Details Keyboard Keyboard

G - Physics

06

F

340/76

G06F 3/023 (2006.01) H03M 11/00 (2006.01)

Patent

CA 1333924

The invention relates to a keyboard comprised of two transverse arrays of conductors defining a number of cross-points at each of which a key is positioned. The depression of a key causes the conductors at the corresponding cross-points to be electrically connected. A scanning device is connected to each of the conductors and adapted during a scanning operation to apply a high or low potential to all the conductors of the two arrays and subsequently sequentially to apply a potential of the opposite type to each conductor of one array and to monitor the potential of the conductors of the other array such that if the potential of a conductor of the other array changes, this indicates that the key at the corresponding cross-point is depressed. The scanning device is connected directly to each of the conductors of the arrays and the keyboard to each of the conductors of the arrays. The keyboard is further comprised of at least one indicating device connected to one of the conductors for indicating a condition of the keyboard.

584866

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