| 摘要 |
<p>PURPOSE:To improve air gap characteristics and to reduce the crosstalk, by ananging plural permanent magnets in a line laterally, constituting plural channel sections, arranging a pair of magnetoresistance effect elements in a magnetic field in each channel section, and applying magnetic bias at all times. CONSTITUTION:A base 1 of a sensor is formed rectangular with a plastic member and a recess hole 22 accommodating permanent magnets 4a-4e are provided at a prescribed interval toward lengthwise direction. A prescribed number of terminal pins 3 are implanted on the base 1, an S pole of the permanent magnets 4a-4e is inserted to the bottom part of the recess hole 2, bonded and fixed and an N pole is exposed to the opening of the recess hole 2. Two magneto- resistance effect elements 5a-6e are respectively fitted to the exposed magnetic pole surface of the permanent magnets 4a-4e, and magnetically biased at all times. The magnetic information medium is constituted into each channel section, plural electric information dots are provided between two non-magnetic substance protection plates provided at the bottom in code and non-code arrangement and the crosstalk of the information medium is reduced.</p> |
