| 摘要 |
PURPOSE:To hold an air gap invariably constant between a recording medium and a sensor which detects position information recorded thereupon by passing external supply air through an air flow passage and jetting it from the surface of a holding member which faces the recording medium. CONSTITUTION:A flexible support plate 11 is fitted to a base part 10 as part of a housing 1. A case is fitted to the tip part of the support plate 11 while having its open surface opposite the magnetic recording medium 3 and an air intake member 13 made of a porous nonmagnetic metallic material is fitted therein. A magneto-resistance element 4 is fitted in the reverse surface of the member 13. Then when air is admitted into the case 12 from an external air supply source through air intake passages 10a and 11a provided to the base part 10 and support plate 11, the air is jetted from the surface of the member 13 which faces the recording medium 3 and a thrust operates on the member 13 in a leaving direction from the recording medium 3. The case 12, on the other hand, is so energized by a spring 16 to come close to the recording medium 3, so the air gap G between the element 4 in the case 12 and the recording medium 3 is held invariably constant.
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