| 摘要 |
PURPOSE:To simplify the trimming operation and make it possible to obtain a desired impedance of high accuracy by cutting off a portion of the magnetic substance constituting a laminated-core transformer, and decreasing the sectional area where magnetic flux passes in order to regulate the impedance. CONSTITUTION:A hole 50 is bored in the magnetic substance in the central part of conductor patterns 2 and 10 to be the primary winding of a laminated-core transformer, from the surface, by using a proper trimming apparatus in order to cut off a given quantity of the magnetic substance. Thereby, the sectional area of the magnetic substance with respect to the primary winding is decreased, so that the impedance of the transformer can be regulated to a desired value. In addition, it is also possible to cut off a given quantity of the magnetic substance in the central part of conductor patterns 3 and 11 to be the secondary winding, instead of that on the primary winding side. Moreover, said regulation can be also effected by cutting off the magnetic substance in the central parts of both windings. |
