PURPOSE: To enable inductance property to be variably adjusted with high precision, by disposing a rough adjustment core and a fine adjustment one on a coil-wound axis so that they can move forward or backward in the direction of the winding axis.
CONSTITUTION: A rough adjustment core 31 and a fine adjustment one 32 are incorporated with screw bonding on an inner wall surface of a nonmagnetic cylinder 2 which is unitedly inserted into an inner diametrical part of a coil bobbin 1 having three divisions of coils N1-N3 wound around its peripheral part. Inductance property is adjusted by inserting a top end part of an adjustment driver into an adjustment groove 311, which is formed on a head part of the rough adjustment core 31, through a perforated hole 321 of the fine adjustment core 32 and then rotating the driver so that the rough adjustment core 31 moves forward or backward respectively in an (a) or (b) arrow direction. Thereafter, the top end part of the driver is moved from the adjustment groove 311 of the rough adjustment core 31 to the one 322, and the fine adjustment core 32 is rotated to perform fine adjustment so that it also moves forward or backward respectively in the (a) or (b) arrow direction. Hence, variable adjustment in the inductance property can be easily performed with high precision.
TAKAHASHI EIJI
DOMON YASUSUKE
DOI SHIGEYUKI
NAKAGAWA SHIRO
Next Patent: ROTARY TRANSFORMER