| 摘要 |
PURPOSE:To reduce the size and weight of a magnetic detector which can hardly pick up external noise by forming a magneto-resistance element and a signal processor on the same substrate, and connecting them via a wiring pattern on the same substrate. CONSTITUTION:A sinusoidal voltage is inputted to a comparator A1 at the neutral voltage (a) between magneto-resistance elements MR1 and MR2, while a divided power source voltage is inputted to the comparator A1 as a reference voltage at the neutral voltage (c) of trimming resistors R3, R4. From the output S1 of the comparator A1, a waveform shaped rectangular signal is outputted. A rotor is controlled to be stopped by counting the signal. A magneto-resistance element pattern 11 and an integrated circuit 12 for forming a signal processor are formed on a glass or silicon substrate 10. The magneto-resistance element is formed by depositing in several microns of Ni-Co or Fe-Ni metal on the surface of the substrate 10 and then etching it, and four other magneto-resistance elements. |
