Patent ID: 7728584
Filing Date: 2010-06-01
Classification: G01D

Abstract:
1. A rotation sensing device, comprising: a magnetic sensor array including magnetic sensor elements in line; a rotatable magnet confronting the magnetic sensor array; a signal readout circuit to read out a signal from the magnetic sensor array; a repeating section to cause the signal readout circuit to repeat reading out the signal from the magnetic sensor array several number of times, and to calculate a summation or an average of the several readout signals; an angle calculating circuit to detect an angle of rotation of the magnet from the summation or the average of the signals calculated by the repeating section; and a reading-out number automatic adjuster to adjust the number of times of reading-out the signal used by the repeating section in accordance with an amount of change in angle, the amount of change in angle representing a difference between successive angles of rotation of the magnet detected by the angle calculating circuit.