Filter element

Abstract

A filter element includes a coil part formed in an overall tubular shape by layering a pair of signal transmitting belt-shaped conductors and a grounding belt-shaped conductor with a belt-shaped insulator in between and winding so that the grounding belt-shaped conductor is outside a pair of signal transmitting belt-shaped conductors, a magnetic body attached to a center of the coil part; a pair of input terminals that are connected to respective outermost circumferential parts of the pair of signal transmitting belt-shaped conductors and are respectively led from outer circumferential positions of the coil part; a pair of output terminals that are connected to respective innermost circumferential parts of the pair of signal transmitting belt-shaped conductors and are respectively led from central positions of the coil part located on an opposite side to leading positions of the pair of input terminals with the magnetic body in between; and a grounding terminal that is connected to an outermost circumferential part of the grounding belt-shaped conductor and is led from an outer circumferential position of the coil part located on an opposite side to the leading positions of the pair of input terminals with leading positions of the pair of output terminals in between.

1 . A filter element comprising:
 a coil part where a generally belt-shape signal transmitting conductor and a generally belt-shape grounding conductor are wound in a spiral with a generally belt-shape insulator in between so that the belt-shape grounding conductor is outside the belt-shape signal transmitting conductor; and   a magnetic core that includes a center core which is passed through a center of the coil part, that forms a magnetic circuit that interlinks the coil part, and includes at least two lead exit parts, a first lead exit part and a second lead exit part, provided at different positions,   wherein an input terminal is connected to an outermost circumferential part of a part of the belt-shape signal transmitting conductor that functions as a filter, an output terminal is connected to an innermost circumferential part of the part of the belt-shape signal transmitting conductor that functions as a filter, the belt-shape grounding conductor, which is adjacent to and inside an outermost circumferential part of the belt-shape signal transmitting conductor, is extended within a range of one outer circumference from a connecting position of the input terminal, and a grounding terminal is connected to a predetermined position on an extended part of the belt-shape grounding conductor, and   wherein the input terminal is led from a first lead exit part and the grounding terminal is led from a second lead exit part.   
   
   
       2 . A filter element comprising:
 a coil part where a generally belt-shape signal transmitting conductor and a generally belt-shape grounding conductor are wound in a spiral with a generally belt-shape insulator in between so that the belt-shape signal transmitting conductor is outside the belt-shape grounding conductor; and   a magnetic core that includes a center core which is passed through a center of the coil part, that forms a magnetic circuit that interlinks the coil part, and includes at least two lead exit parts, a first lead exit part and a second lead exit part, provided at different positions,   wherein an input terminal is connected to an innermost circumferential part of a part of the belt-shape signal transmitting conductor that functions as a filter, an output terminal is connected to an outermost circumferential part of the part of the belt-shape signal transmitting conductor that functions as a filter, the belt-shape grounding conductor, which is adjacent to and outside an innermost circumferential part of the belt-shape signal transmitting conductor, is extended within a range of one inner circumference from a connecting position of the input terminal, and a grounding terminal is connected to a predetermined position on an extended part of the belt-shape grounding conductor, and   wherein the input terminal is led from a first lead exit part and the grounding terminal is led from a second lead exit part.   
   
   
       3 . A filter element according to  claim 1 ,
 wherein in a case where the input terminal is extended within the magnetic circuit towards the first lead exit part, a direction of extension is set as a winding direction of the coil part.   
   
   
       4 . A filter element according to  claim 2 ,
 wherein in a case where the input terminal is extended within the magnetic circuit towards the first lead exit part, a direction of extension is set as a winding direction of the coil part.   
   
   
       5 . A filter element according to  claim 1 ,
 wherein a length of an extension of the input terminal within the magnetic circuit is less than 360° from a connection position of the input terminal.   
   
   
       6 . A filter element according to  claim 2 ,
 wherein a length of an extension of the input terminal within the magnetic circuit is less than 360° from a connection position of the input terminal.   
   
   
       7 . A filter element according to  claim 1 ,
 wherein the output terminal is led from one of the first lead exit part, the second lead exit part, or a third lead exit part provided separately.   
   
   
       8 . A filter element according to  claim 2 ,
 wherein the output terminal is led from one of the first lead exit part, the second lead exit part, or a third lead exit part provided separately.   
   
   
       9 . A filter element according to  claim 1 ,
 wherein the magnetic core is composed of a generally tubular pot-shape core including the center core, and the first lead exit part and the second lead exit part are disposed at positions so that magnetic characteristics of two paths that pass both sides of the center core inside the pot-shape core are substantially equal.   
   
   
       10 . A filter element according to  claim 2 ,
 wherein the magnetic core is composed of a generally tubular pot-shape core including the center core, and the first lead exit part and the second lead exit part are disposed at positions so that magnetic characteristics of two paths that pass both sides of the center core inside the pot-shape core are substantially equal.   
   
   
       11 . A filter element according to  claim 1 ,
 wherein the magnetic core is composed of a partitioned rectangular segmented core including the center core, and the first lead exit part and the second lead exit part are disposed by dividing both sides of the partitioned rectangular segmented core by the magnetic circuit that interlinks the coil part.   
   
   
       12 . A filter element according to  claim 2 ,
 wherein the magnetic core is composed of a partitioned rectangular segmented core including the center core, and the first lead exit part and the second lead exit part are disposed by dividing both sides of the partitioned rectangular segmented core by the magnetic circuit that interlinks the coil part.   
   
   
       13 . A filter element according to  claim 1 ,
 wherein the filter element includes one generally belt-shape signal transmitting conductor and at least one generally belt-shape grounding conductor and acts as a normal mode noise filter.   
   
   
       14 . A filter element according to  claim 2 ,
 wherein the filter element includes one generally belt-shape signal transmitting conductor and at least one generally belt-shape grounding conductor and acts as a normal mode noise filter.   
   
   
       15 . A filter element according to  claim 1 ,
 wherein the filter element includes a plurality of generally belt-shape signal transmitting conductors and at least one generally belt-shape grounding conductor and acts as a common mode noise filter.   
   
   
       16 . A filter element according to  claim 2 ,
 wherein the filter element includes a plurality of generally belt-shape signal transmitting conductors and at least one generally belt-shape grounding conductor and acts as a common mode noise filter.   
   
   
       17 . A filter element according to  claim 13 ,
 wherein the respective belt-shape signal transmitting conductors are disposed in parallel on one surface of the belt-shape insulator so as to be separated from one another in a width direction of the belt-shape insulator, and   the filter element includes at least as many generally belt-shape grounding conductors as generally belt-shape signal transmitting conductors and the belt-shape grounding conductors are disposed in parallel on another surface of the belt-shape insulator so as to be separated from one another in the width direction of the belt-shape insulator.   
   
   
       18 . A filter element according to  claim 16 ,
 wherein the respective belt-shape signal transmitting conductors are disposed in parallel on one surface of the belt-shape insulator so as to be separated from one another in a width direction of the belt-shape insulator, and   the filter element includes at least as many generally belt-shape grounding conductors as generally belt-shape signal transmitting conductors and the belt-shape grounding conductors are disposed in parallel on another surface of the belt-shape insulator so as to be separated from one another in the width direction of the belt-shape insulator.   
   
   
       19 . A filter element according to  claim 17 ,
 wherein the respective belt-shape grounding conductors correspond to the respective belt-shape signal transmitting conductors and a same number of the grounding conductors are disposed in parallel with each generally belt-shape signal transmitting conductor.   
   
   
       20 . A filter element according to  claim 18 ,
 wherein the respective belt-shape grounding conductors correspond to the respective belt-shape signal transmitting conductors and a same number of the belt-shape grounding conductors are disposed in parallel with each generally belt-shape signal transmitting conductor.   
   
   
       21 . A filter element according to  claim 19 ,
 wherein the respective belt-shape signal transmitting conductors are disposed in parallel so as to face only the corresponding belt-shape grounding conductors.   
   
   
       22 . A filter element according to  claim 20 ,
 wherein the respective belt-shape signal transmitting conductors are disposed in parallel so as to face only the corresponding belt-shape grounding conductors.