PURPOSE: To obtain position relation between two magnetic sensors fixed to an operation lever easily with high precision by arranging the magnetic sensors so that their magnetism sensing surfaces are in the same plane and cross a reference magnetism sensing direction at right angles, and applying bias magnetic field of the same intensity all the time.
CONSTITUTION: A ball 10 made of a nonmagnetic material is fixed to one end of the operation lever 9 and the ball 10 incorporates a permanent magnet 11. The ball 10 is supported by a ball supporting part rotatably around its center point and in a rectangular case 13, a printed board 16 is fitted fixedly. On the printed board 16, two magnetic sensors 17 and 18 are arranged in parallel and two bias magnets 19 and 20 are fixed facing them. The magnetic sensors 17 and 18 are arranged on the same plane at equal distance from the center point of the ball 10 in 90° different directions; one magnetic sensor 17 faces in a direction X as a reference direction P1 and the other sensor 18 faces in a direction Y as a reference direction P2.
| JP3195746 | MULTI-PANEL DIGITIZER |
| JP2000147034 | TIGHTLY FIXED NEAR-MAGNETIC FIELD PROBE |
| WO/2019/216179 | ROTATION DETECTION DEVICE |
FUJII KOUHEI
NAKATSUJI FUMIO
