Patent ID: 7088347

Claim:
A coordinate input device for inputting coordinates on a screen of a display, comprising: a board providing a coordinate input surface; a plurality of vibration detectors that are arranged on the board or in a periphery of the coordinate input surface, wherein each of the vibration detectors detects vibration or sound that occurs when a position input member is brought into contact with the coordinate input surface of the board at an arbitrary input position, the vibration detectors each outputting a vibration detection signal at a timing corresponding to the detection of the vibration or sound; a time difference determiner that determines a time difference between timing of a vibration detection signal from one of the vibration detectors and timing of a vibration detection signal from another of the vibration detectors; and a calculation device that performs calculations based on the time difference determined by the time difference determiner in order to determine the input position at which the vibration occurs on the coordinate input surface of the board.