| 摘要 |
PROBLEM TO BE SOLVED: To provide a rotational angle detector with no detection error due to changes in the direction of a magnetic flux to a magnetic detection chip. SOLUTION: Polarizing directions of a magnetic flux imparting magnet 11 and a magnetic flux attracting magnet 12 in the direction of the rotation axis are opposite. Because of this, even when the magnets are located a distance L apart from a magnetic detection chip 3 in the direction of the rotational axis, a magnetic flux a1 can be applied to the magnetic detection chip 3. As a result, the magnetic detection chip 3 which is located at a position where a shielding member is placed in-between can detect a rotational angle of a magnetic flux generating means 5. By providing the magnetic flux imparting magnet 11 and the magnetic flux attracting magnet 12 in parallel with sufficient length, even if there exists an assembly deviation between the magnetic flux generating means 5 and the magnetic detection chip 3, a magnetic flux corresponding to a rotational angle can be applied to the magnetic detection chip 3, thereby preventing errors. COPYRIGHT: (C)2005,JPO&NCIPI
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