Patent ID: 7038658

Claim:
An input device comprising: a permanent magnet to be worn by a user on one fingertip of either a right hand or a left hand; a first magnetic sensor to be worn by the user on a wrist of either the right hand or the left hand to detect a magnetic field generated by the permanent magnet at a position of the first magnetic sensor, and a magnetic field generated by geomagnetism; a second magnetic sensor to be worn by the user on the same wrist on which the first magnetic sensor is worn and always at a position that is farther from the permanent magnet than the first magnetic sensor, to detect the magnetic field generated by the permanent magnet at a position of the second magnetic sensor and the magnetic field generated by the geomagnetism; and an output unit to output a difference between an output signal from the first magnetic sensor and an output signal from the second magnetic sensor, so that the magnetic field generated by the geomagnetism is eliminated.