| 摘要 |
PURPOSE:To obtain a precise differential output and to detect a displacement quantity more precisely by arraying at least two magnetic resistance effect elements (MR elements) in the direction intersected with the displacement direction so as to be opposed to magnetic recording tracks forming their magnetic patterns with different phases each other. CONSTITUTION:A magnetic recording medium 10 is composed of two recording tracks 11a, 11b and records a magnetic pattern by shifting it by a half of a pitch P. When the magnetic recording medium 10 is displaced, the resistance values R of the MR elements are changed as shown by curves 13a, 13b. The differential output voltage shown by the curve 14 is obtained by finding the difference between the output signals of the MR elements 12, 12b. Since the MR elements 12a, 12b are arrayed in the direction intersected with the displacing direction, the detection does not depend upon the pitch P of the magnetic pattern and the magnetic sensor can be used in common also for the magnetic patterns with different pitches P. |
