Magnetic detection device with a dual magnetic flux path

摘要

The device has a permanent magnet associated to a magnetic flux sensor (5) by a frame (6) for circulation of magnetic flux generated by the magnet towards the sensor. The frame has two arms (9, 10) defining respectively two magnetic flux circulation paths. One path has a variable reluctance which is reduced when a magnetic unit is opposite to one arm. The path has a total interference lower than total interference of the other path.