MAGNETIC SENSOR AND MAGNETIC ENCODER

摘要

Provided are a magnetic sensor and a magnetic encoder wherein the duty ratio of a high/low binary signal is constant and a stable output is ensured. The magnetic sensor is disposed in a position away from the magnetized surface of a magnet in which an N pole and an S pole are alternated in a relative movement direction.  The magnetic sensor has a sensor unit (bridge circuit) (55) comprising a magnetic sensing element having an electric resistance value which varies with the external magnetic field and a control unit (integrated circuit) (56) for generating a high/low binary signal according to the sensor output from the sensor unit (55).  The magnetic sensor is characterized in that the control unit (56) has a comparator (59) for obtaining the binary signal by comparison of the sensor output with a threshold value and a threshold value setting circuit (53) for setting the threshold value according to the maximum peak and the minimum peak of the sensor outputs two outputs before.