| 摘要 |
<p>PURPOSE:To reduce a magnetic resistance between primary side and secondary side of a rotary transformer in which a signal is transferred by rotating one of the primary side or the secondary side which are facing each other with a gap inbetween and improve a coupling efficiency by a method wherein the surface of at least one of the magnetic cores facing each other is coated by a high permeability material such as permalloy. CONSTITUTION:The surfaces of the magnetic cores facing each other have no groove and are kept flat and through-hole printed coils 40 and 50, one for each core, are adhered to the respective surfaces. At that time, distance between two cores is l'g and the coils 40 and 50 are adhered to the cores with permalloy thin films 6 inbetween. Then, at the prescribed positions on the surfaces of the coils 40 and 50 the primary windings 41 and 42 and the secondary windings 51 and 52 are formed. Thus, the grooves on the surface of the core are eliminated and the yield is improved and an economical transformer can be obtained.</p> |
