| 摘要 |
PURPOSE:To obtain a rotation sensor which has a large gap between a rotation part and a magneto-resistance element and superior characteristics and reliability by installing the magneto-resistance element which detects signal magnetic field variation as resistance variation on a substrate made of a ferromagnetic material. CONSTITUTION:When there is no ferromagnetic body near a magnet for generating a signal magnetic field, the signal magnetic field becomes weak abruptly according to the distance from the magnet, but when there is a thick ferromagnetic material plate near the magnet, the reactance of the internal magnetic path in this plate is extremely small, so the magnetic field reaching this plate is relatively intense. Therefore, the magneto-resistance element is installed on the substrate made of the ferromagnetic material. Consequently, a large gap is left between the rotation part which generates the signal magnetic field and the magneto-resistance element and the allowable tolerance of parts and assembly increases to obtain a highly reliable product easily. |
