| 摘要 |
PURPOSE:To improve accuracy of a magnetic rotary sensor, by forming a bridge by connecting 4 magnetoresistance elements of a magnetic rotary sensor and applying magnetic field of a magnetic pattern to 2 pairs of opposing resistance elements consecutively and alternatingly for each pair and to each opposing side in a reversed direction simultaneously. CONSTITUTION:A 4-side bridge circuit is formed with magnetoresistance elements R1-R4 of a magnetic rotary sensor. Each element R1-R4 is located with 1/2 pitch of the pitch lambda of a magnetic pattern installed on a rotating shaft. This, a magnetic field in a reversed direction is applied simultaneously to resistance elements R1, R3 (R2, R4) of side positioned in an opposed manner and an alternating magnetic field are applied to a group of 2 pairs of opposing resistance elements. In this way, when a differential output of output terminals A, B of the bridge is taken, a signal of the specified frequency can be obtained. |
