| 摘要 |
PURPOSE:To take the degree of a true roundness easily by integrally forming a groove for a channel and a split groove on a molding and filling the split groove with a resin after sintering. CONSTITUTION:The channel grooves 11, 12 and the split groove 13 on the surface reverse to the surface, on which the grooves 11, 12 are formed, are formed integrally on a molding. The depth of the split groove 13 is formed previously in size larger than the thickness of the core for a desired separate type rotary transformer at that time. A shape is sintered, and the split groove 13 is filled with the resin 14. The resin 14 is dried, and the bottom of the split groove 14 is ground, thus obtaining the core for the rotary transformer. Accordingly, the degree of the true roundness can be taken easily because the core has been through a process as a monobloc material from the stage of a formation thereof. |
