| 摘要 |
PROBLEM TO BE SOLVED: To provide a sensor module for measuring relative displacement, and a method of sensing a moving direction using the sensor module. SOLUTION: The sensor module for measuring the relative displacement of an object having a group pattern with alternately formed projections and recesses, includes a magnet 140 for generating the magnetic field; a giant magneto resistance (GMR) sensor 130 installed between the magnet and the object to sense a variation in the magnetic field and output an electric signal; a signal processing part 150 for processing the output signal from the giant magneto resistance sensor to output a rectangular wave; and a housing 110 for supporting the magnet, the giant magneto resistance sensor and the signal processing part. The moving direction, moving distance, moving speed, and the like of the object can thereby be measured stably in a non-contact manner. In addition, the sensor module can be used regardless of the shape or kind of an actuator and can sense accurately even if a connection point with the object is limited in a narrow range. COPYRIGHT: (C)2009,JPO&INPIT
|
