| 摘要 |
<p>PURPOSE:To enlarge effective area of an air gap, to enlarge combination inductance and to enlarge coupling coefficient by forming opposing face of a fixed side core and a rotary side core to intersect obliquely to a plane that intersects the rotation axis at right angles. CONSTITUTION:An opposing face of the rotary side core 1 and fixed side core 3 is formed to intersect obliquely to a plane that intersects the rotation axis that rotates a rotary head at right angles. Accordingly, the area S of air gap can be made large. Consequently, combination inductance which is in proportional relation with the area of air gap can also be made large, and coupling coefficient becomes large. When the center axis is deviated within an extent that does not cause contact of respective opposing faces of the rotary side core 1 and fixed side core 3, the length lg1 of air gap to which opposing faces draw near becomes shorter than the case in which the center axis conforms correctly. On the other hand, the length lg2 of air gap from which the opposing faces separate becomes longer. Accordingly, change of combination inductance and change of coupling coefficient offset each other, and consequently, the change can be reduced.</p> |
