| 摘要 |
<p>PURPOSE:To remarkably reduce cost of a rotary transformer to be mounted as the signal transmitting component of a rotating head cylinder without necessitating highly accurate polishing. CONSTITUTION:At least one of the materials of an inner side magnetic body 16, which has a coil groove 17 on the outer circumference plane for winding signal coil 18, and an outer side magnetic body 21, which has a coil groove 24 on the inner circumference plane for winding signal coil 23, is constituted by using resin ferrite. When resin ferrite is used for the both bodies, the number of the signal transmitting system is reduced, and when resin ferrite is used only for the one body, the magnetic permeability of the sintered ferrite of the other body is permitted to be high. Since the rotary transformer is constituted without reducing the characteristic values without highly accurate polishing, remarkable cost down is allowed.</p> |
