JP2007080951A - Line filter and method of manufacturing same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a line filter in which the distance between a center magnetic core to be inserted and a magnetic core of closed magnetic path is made constant during assembly, and in which normal mode characteristics are made stabilized, in the line filter for removing noise. <P>SOLUTION: A through-hole guide hole for guiding the center magnetic core is provided to an intermediate collar of the bobbin, and the magnetic core of closed magnetic path is built into the through-hole of bobbin. One winding and the other winding are wound around the bobbin, and the center magnetic core is inserted into the internal side of the through-hole guide hole from the external side. The magnetic core of closed magnetic path is fixed on a terminal board, a processor for compensating position is pressed with a tool from a tool inserting hole provided to the bobbin, and the center magnetic core is moved in the outer peripheral direction of the bobbin and is then fixed to the positioning part provided on the terminal board. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a line filter used in various electronic devices.

A conventional line filter will be described with reference to the drawings.
9 is a perspective view of a conventional line filter, FIG. 10 is a perspective view of a center magnetic core of the line filter, and FIG. 11 is a perspective view of a bobbin of the line filter.

  9, 10, and 11, the conventional line filter includes a bobbin 1 having a cylindrical through hole in the central shaft portion and a closed-letter-shaped magnet having a central magnetic leg 21 inserted into the through hole of the bobbin 1. A path magnetic core 2, one winding and the other winding wound around the bobbin, a center magnetic core 3 disposed from the inside in a recess 1a on the inner peripheral side of the bobbin 1, and the center magnetic core 3 A locking piece 1c for fixing the inside of the bobbin 1, a terminal block 4 for supporting and fixing the bobbin 1 and the closed magnetic path magnetic core 2, and one winding and the other winding connected to the terminal block 4 Terminal 51 is provided.

  The bobbin 1 has a plurality of circular ridges and a plurality of winding parts, and is divided into two parts. A recessed part 1a is provided in the inner peripheral part of the divided individual bobbin, and the center magnetic core 3 is a locking piece in the recessed part 1a. Arranged by the locking means by 1c. In the combined individual bobbins, the central magnetic leg of the sun-shaped closed magnetic path core 2 is arranged, and one winding and the other winding are wound.

The individual bobbin is provided with a through window 1b passing through the outer peripheral surface, and a center magnetic core 3 provided with a protruding portion 3a protruding from the through window 1b is disposed so as to be in non-contact with the closed magnetic path magnetic core 2. Thus, a part of the center magnetic core 3 is exposed.
As a prior art document related to this application, for example, Patent Document 1 is known.
JP 2000-195730 A

However, in such a structure, the center magnetic core 3 is locked by the locking pieces 1c at both ends of the recess 1a of the bobbin 1 and fixed in the recess 1a. Since the center magnetic core 3 is elastically held by providing slits on both sides of the locking piece 1c at the front end so that the centering magnetic core 3 can be inserted more elastically. When the wire is wound, the locking piece 1c opens outward, and the position of the center magnetic core 3 is adjusted, but cannot be fixed at an accurate position, which adversely affects the removal of normal mode noise.

Further, a locking piece 1c for pressing the center magnetic core 3 from the inner peripheral surface side to the outer peripheral surface side of the bobbin 1 is provided, and the center magnetic core 3 is pressed toward the bottom surface of the concave portion 1a. The protrusion 3a is pushed from the outside through the through window 1b. However, since the locking piece 1c is made of an elastic body such as resin, the position of the center magnetic core 3 becomes unstable and cannot be accurately determined.

Further, the protrusion 3a is pushed from the outside of the individual bobbin through the through window 1b. However, since the bobbin 1 around which the coil is wound cannot be disassembled, the positions of the center magnetic core 3 and the closed magnetic path magnetic core 2 are made constant. I can't.

  For this reason, the positions of the center magnetic core 3 and the closed magnetic path magnetic core 2 inserted in the bobbin 1 are not always constant, and there is a problem that the normal mode characteristics are not stable.

  Therefore, the present invention provides a line filter that stabilizes the normal mode characteristics by making the positions of the center magnetic core 3 and the closed magnetic path magnetic core 2 constant in production.

In order to solve the above problems, in the present invention, as shown in claim 1, a bobbin having a through hole in the central shaft portion and outer flanges at both ends of the outer periphery, and a central magnetic leg is inserted into the through hole of the bobbin A closed magnetic path magnetic core, a winding wound around the bobbin and the other winding, a center magnetic core to be inserted into the bobbin, and a terminal block for holding the closed magnetic path magnetic core. In the line filter provided, the bobbin includes a middle collar portion into which the center magnetic core that divides the one winding and the other winding is inserted at a substantially center of the outer collar portion, The collar portion has a through guide hole having a guide function for sliding the center magnetic core, and the terminal block surrounds the one winding and the other winding wound around the bobbin. An insulating wall is provided to insulate the closed magnetic path magnetic core from the front A line filter, wherein a positioning portion for positioning said center core in a portion opposed to the middle flange portion is, the position of the center magnetic core is stabilized.

According to a second aspect of the present invention, the positioning portion is a positioning means for fixing the position by moving the center magnetic core in the outer circumferential direction of the bobbin within the through guide hole. 1. The line filter according to 1, wherein the center magnetic core can be accurately positioned.

According to a third aspect of the present invention, the center magnetic core has a position correction processing portion on at least one of the surfaces facing the central magnetic leg, and the bobbin is inserted with a jig corresponding to the position correction processing portion. And a means for fixing the center magnetic core to the positioning portion by inserting a jig through the jig insertion hole and pressurizing the position correction processing portion. Item 3. The line filter according to item 1 or 2, wherein the normal mode characteristics are improved.

According to a fourth aspect of the present invention, the guide mechanism is a convex portion or a concave portion provided inside the through guide hole corresponding to the concave portion or the convex portion of the center magnetic core. Since it is a line filter given in any 1 paragraph of 1-3, a center magnetic core can be easily assembled to a bobbin, and workability becomes good.

5. The center magnetic core according to claim 1, wherein the center magnetic core is fixed to the positioning portion at a non-contact position with the closed magnetic path magnetic core. It is a line filter and normal mode characteristics are stable.

As shown in claim 6, a central magnetic leg of a closed magnetic path magnetic core is inserted into a central shaft portion of the bobbin, the bobbin is combined, and the one winding and the other winding are wound around the bobbin. Thereafter, the center magnetic core is inserted into the through guide hole of the bobbin from the outside to the inside, the closed magnetic path magnetic core is fixed to the terminal block, and then the center magnetic core is placed in the through guide hole in the outer periphery of the bobbin. 6. The method of manufacturing a line filter according to claim 1, wherein the position is fixed to the positioning portion by moving in a direction, so that the workability is improved and the assembly can be easily performed.

The center magnetic core has a position correction processing portion on at least one of the surfaces facing the central magnetic leg, and the bobbin is inserted with a jig corresponding to the position correction processing portion. The center magnetic core is moved in the direction of the outer periphery of the bobbin in the through guide hole by inserting a jig from the jig insertion hole and pressurizing the position correction processing portion. The position is fixed to the positioning portion, and the method for manufacturing a line filter according to claim 6, can be easily assembled.

As shown in claim 8, by pressing the bobbin with a jig, the center magnetic core is moved in the outer peripheral direction of the bobbin within the through guide hole, and the position is fixed to the positioning portion. Since it is the manufacturing method of the line filter of Claim 6, it can assemble easily.

According to the present invention as described above, since the center flange portion has the through guide hole into which the center magnetic core can be inserted from the outside, the center magnetic core can be mounted after the coil is wound around the bobbin. The center magnetic core misalignment problem does not occur. In addition, since the through guide hole has a guide function when the center magnetic core is slid from the outside, the terminal block has a positioning portion that positions the center magnetic core in a portion facing the center part, so that the conventional example Positioning can be performed without elastically holding the center magnetic core, the position of the center magnetic core is stabilized, and the normal mode characteristics are stabilized.

In addition, the center magnetic core has position correction processing portions at both ends of the surface facing the center magnetic leg, and the bobbin has a jig insertion hole facing the position correction processing portion. Is inserted, pressurizes the position correction processing part, moves the center magnetic core in the direction of the outer periphery of the bobbin within the through guide hole, and the position of the center magnetic core is fixed by the positioning part provided on the terminal block. The distance between the magnetic core and the closed magnetic path magnetic core becomes constant, and the normal mode characteristics are stabilized.

Further, since the center magnetic core is fixed to the positioning portion in a non-contact state with the closed magnetic path magnetic core, the normal mode characteristics are improved.

Also, the guide mechanism of the through guide hole is a convex part or concave part provided inside the through guide hole corresponding to the concave part or convex part of the center magnetic core, so that the center magnetic core can be easily attached to the bobbin Workability is improved.

  A through guide hole for guiding the center magnetic core is provided in the center part of the bobbin, and one winding and the other winding are wound around the bobbin. Thereafter, the center magnetic core is inserted into the through guide hole from the outside to the inside and fixed to the terminal block. The center magnetic core position correction processing part was pressed with a jig from the jig insertion hole provided in the bobbin, and the center magnetic core was moved in the bobbin outer peripheral direction and fixed to the positioning part provided on the terminal block.

FIG. 1 is an exploded perspective view of a line filter according to an embodiment of the present invention.
FIG. 2 is a perspective view of a line filter used in the embodiment of the present invention.
FIG. 3 is a perspective view of the center magnetic core used in the embodiment of the present invention.
FIG. 4 is a perspective view of a center magnetic core used in another embodiment of the present invention.
FIG. 5 is a front view of the bobbin after coil winding used in the embodiment of the present invention before the center magnetic core is arranged.
FIG. 6 is a cross-sectional view in which the center magnetic core is inserted into the bobbin after winding the coil used in the embodiment of the present invention.
FIG. 7 is a cross-sectional view of a bobbin and a closed magnetic path magnetic core used in an embodiment of the present invention combined with a terminal block.
FIG. 8 is a sectional view of the positioning of the center magnetic core used in the embodiment of the present invention.

  1 to 4, the line filter in the present embodiment is a Japanese character having a bobbin 1 having a cylindrical through hole 11 in a central shaft portion and a central magnetic leg 21 inserted into the through hole 11 of the bobbin 1. The closed magnetic path magnetic core 2, one winding 13 and the other winding 14 wound around the bobbin 1, the center magnetic core 3 inserted into the through guide hole 18 at the approximate center of the bobbin, and the bobbin 1 and a terminal block 4 for supporting and fixing the closed magnetic path magnetic core 2, a terminal 51 implanted in the terminal block 4 and connected to one winding 13 and the other winding 14, and a removing means for removing the common mode And a removing means for removing the normal mode.

  The bobbin 1 is made of a semi-cylindrical winding frame divided into two parts, and has a cylindrical through hole 11 in the central shaft portion, and the central magnetic leg of the closed-circuit magnetic core 2 having a letter shape in the through hole 11. 21 is inserted. The bobbin 1 is provided with two outer flange portions 12 and an intermediate flange portion 15 that divides one winding 13 and the other winding 14 at substantially the center, and the one winding 13 and the other winding 14 are connected to each other. Further, each of the outer flange portions 12 is provided with a gear 17 that receives a force from an external force when the coil is wound around the bobbin.

Further, the bobbin 1 is provided with a through guide hole 18 in a middle flange portion 15 into which the center magnetic core 3 is inserted. The through guide hole 18 has a guide function for sliding the center magnetic core 3. In this guide function, a concave portion 18a and a convex portion 18b corresponding to the shape of the convex portion 31 and the concave portion 32 provided on the side surface of the center magnetic core 3 to be described later are provided in the through guide hole 18, and the center magnetic core 3 has a fixed direction. You can slide freely and move. The through guide hole 18 is provided with a means for locking the center magnetic core 3 after the coil is wound around the bobbin 1 because the center magnetic core 3 can be slid in a certain direction but no means for locking the center magnetic core 3 is provided. Adhesive is used.

Further, the bobbin 1 is provided with a jig insertion hole 1d corresponding to a position correction processing portion (a corner portion 33 described later) used for positioning the center magnetic core 3. In the present embodiment, two jig insertion holes 1d are provided at locations corresponding to the upper side of the position correction processing portion. As another embodiment, a jig insertion hole 1d provided in the bobbin 1 may be provided beside the position correction processing portion.

  The closed magnetic path magnetic core 2 is made of a magnetic material in the shape of a letter, has a center magnetic leg 21 and both end magnetic legs 22, and the center magnetic leg 21 is chamfered.

  The center magnetic core 3 is a magnetic body and has a convex portion 31 and a concave portion 32 on both side surfaces, and a concave portion 18 a and a convex portion 18 b are provided in the corresponding through guide hole 18. The concave portion 18a and the convex portion 31 and the convex portion 18b and the concave portion 32 respectively correspond to guides, and the center magnetic core 3 can be freely moved only in a certain left and right direction in the through guide hole 18, and is slid and inserted.

Further, the center magnetic core 3 is provided with a corner 33 used for positioning after being inserted into the bobbin 1. A force G is applied to the corner portion 33 in the vertical direction of the drawing by the pressing jig, and the center magnetic core 3 is slid in the lateral direction by the force G. In this embodiment, the corner portion 33 is a C-plane having a corner angle of 45 degrees as a position correction processing portion. However, the corner portion 33 may have a shape with a sharp corner angle or an R shape. . Further, as shown in FIG. 4, the corner 33 may be formed into a concave groove shape.

The center magnetic core 3 has an outer surface portion 34, an inclined portion 35, and an opposite surface portion 36. The opposite surface portion 36 is a surface where the center magnetic cores 3 face each other so as to wrap the central magnetic leg 21. The outer surface portion 34 is a surface opposite to the facing surface portion 36 and is a surface facing the both end magnetic leg 22 side. The inclined portion 35 is provided at an angle with respect to the center magnetic core 3 while being in partial contact with the outer surface portion 34. Regarding the angle of the inclined portion 35, the horizontal direction in FIGS. 7 and 8 is the horizontal direction, and the internal angle at which the horizontal direction and the inclined portion 35 intersect is 45 degrees in this embodiment, but it may be an acute angle.

When the center magnetic core 3 on the right side of FIGS. 7 and 8 is viewed, two inclined portions 35 are provided at the top and bottom of the drawings. In the center magnetic core 3 on the right side, the lower inclined portion 35 in the vertical direction of the drawing will be described. The lower inclined portion 35 is used when the center magnetic core 3 is slid and positioned. The inclined portion 35 is not in contact with the bobbin receiving portion 45 that holds the bobbin 1 provided on the terminal block 4 when the closed magnetic path magnetic core 2 is incorporated in the bobbin 1 and the center magnetic core 3 is inserted and incorporated in the terminal block 4. It becomes the size that becomes. The inclined portion 35 is in contact with a positioning portion 44 provided on the terminal block 4 so that the outer surface portion 34 is not in contact with both end magnetic legs 22 when the center magnetic core 3 slides to the right side of the drawing. The center magnetic core 3 is positioned. The inclination height of the inclined portion 35 is set so that at least a part of the height is higher than the positioning portion 44. Although the above description is about the center magnetic core 3 on the right side of the drawing, the same applies to the center magnetic core 3 on the left side of the drawing.

  The terminal block 4 supports and fixes the bobbin 1 in which the center magnetic core 3 is inserted and the closed magnetic path magnetic core 2 having the central magnetic leg 21 sandwiched and combined in the through hole 11 of the bobbin 1. The terminal block 4 is provided with a substantially vertical insulating wall 42 that insulates one winding 13 and the other winding 14 wound around the bobbin 1 and the closed magnetic path magnetic core 2 surrounding the winding 13. In the terminal block 4, a cutout portion 43 corresponding to the middle flange portion 15 of the bobbin 1 is provided in the insulating wall 42, and a positioning portion 44 is provided in a part of the cutout portion 43. Since the terminal block 4 is provided with the insulating wall 42, the one winding 13 and the other winding 14 can be insulated from the closed magnetic circuit core 2. In addition, the terminal block 4 is provided with a bobbin receiving portion 45 that holds the bobbin 1 below the notch 43 corresponding to the middle flange portion 15 of the bobbin 1.

The positioning portion 44 is located inside the both-end magnetic legs 22 after the closed magnetic path magnetic core 2 is supported and fixed to the terminal block 4. Such a positioning portion 44 has an inclined shape in the present embodiment, but may have an R shape.

The length from the outer surface portion 34 to the opposite surface portion 36 of the center magnetic core 3 is shorter from the center of the central magnetic leg 21 than the outside of the insulating wall 42 and longer from the center of the central magnetic leg 21 to the inner side of the insulating wall. Yes.

  Next, this line filter includes a removing means for removing a common mode and a removing means for removing a normal mode as means for removing noise. The removing means for removing the common mode causes the magnetic fluxes generated from the one winding 13 and the other winding 14 to be in the same direction in the closed magnetic circuit core 2 and to cancel each other. I am doing so. Further, the removing means for removing the normal mode causes the respective magnetic fluxes generated from the one winding 13 and the other winding 14 to flow in the same direction in the center magnetic core 3 disposed on the bobbin 1 and to close the magnetic field. The path magnetic cores 2 are caused to flow in opposite directions so that the magnetic fluxes generated in the closed magnetic path magnetic core 2 are not canceled out from each other.

  The assembly method of the line filter having such a configuration will be described below with reference to FIGS.

5 and 6, the central magnetic leg 21 of the sun-shaped closed magnetic path core 2 is inserted into the central axis portion of the half-cylindrical winding frame divided into two, and the bobbin 1 is combined. The bobbin 1 has a gear 17 on one side of the outer flange portion 12. A rotational force is applied to the gear 17 by using an external force, and the coil is rotated around the central magnetic leg 21 so that the coil is connected to the bobbin 1. Wind the winding 13 and the other winding 14. Thereafter, the center magnetic core 3 is inserted into the through guide hole 18 of the wound bobbin 1 from the outside to the inside.

  In FIG. 7, the closed magnetic path magnetic core 2 is set in the horizontal direction in the drawing, and the jig insertion hole 1d in the bobbin 1 is set in the vertical direction in the drawing to be fixed to the terminal block 4. This terminal block 4 has a substantially vertical insulating wall 42, and this insulating wall 42 is projected between both end magnetic legs 22 of the closed magnetic path magnetic core 2 and the bobbin 1 around which the coil is wound. The closed magnetic path magnetic core 2 is positioned in contact with the insulating wall 42 as shown in FIG. An adhesive or the like is used to fix the closed magnetic path magnetic core 2 and the terminal block 4.

In FIG. 8, the corner 33 of the center magnetic core 3 is pressed from the vertical direction of the drawing with the jig G whose tip is substantially protruding from the jig insertion hole 1d of the bobbin 1, and the center magnetic core 3 is slid outward. .
The center magnetic core 3 moves in the outward direction of the bobbin 1, and the inclined portion 35 contacts the positioning portion 44 provided on the terminal block 4. As another embodiment, there is a method in which the slide in the through guide hole 18 of the center magnetic core 3 is attracted by a magnet using the characteristics of a magnetic material, or the center magnetic core 3 is slid from the outside of the bobbin 1 by air suction. . In this embodiment, as the simplest method, the corner 33 is pushed from the vertical direction of the drawing using the jig G having a substantially protruding shape from the jig insertion hole 1d to the bobbin 1, and the center magnetic core 3 is positioned by the positioning part 44. Was slid.

The length from the outer surface portion 34 of the center magnetic core 3 to the opposite surface portion 36 is shorter from the center of the central magnetic leg 21 than the outside of the insulating wall 42 and longer from the center of the central magnetic leg 21 to the inner side of the insulating wall. It has become.

  Therefore, after the closed magnetic path magnetic core 2 is assembled in the bobbin 1 and the center magnetic core 3 is inserted into the terminal block 4, the outer surface 34 moves the position of the center magnetic core 3 and fixes the closed magnetic path magnetic core 2. It can be positioned without contact with the inside of the magnetic legs 22 at both ends. Further, since there is a guide mechanism of the convex portion 31 and the concave portion 32 provided in the center magnetic core 3 and the concave portion 18 a and the convex portion 18 b of the through guide hole 18, the center magnetic core is reliably positioned on the bobbin 1. As another embodiment, the center magnetic core 3 has a slide mechanism that slides in the horizontal direction of the drawing by pressing the upper surface of the bobbin 1 with a jig having a flat tip, and the inclined portion 35 contacts the positioning portion 44. Therefore, the center magnetic core 3 is moved and positioned in the outer peripheral direction of the bobbin 1.

The center magnetic core 3 applies an adhesive to the notch 43 corresponding to the middle flange portion 15 of the bobbin 1 to fix the closed magnetic path magnetic core 2, the center magnetic core 3, and the bobbin 1. .

As a result, the positions of the center magnetic core 3 and the closed magnetic path magnetic core 2 are constant in manufacturing, and the normal mode characteristics can be stabilized.

  Then, one winding 13 and the other winding 14 wound around the bobbin 1 are connected to a terminal 51 provided on the terminal block 4 by soldering or the like.

  The gist of the present invention is that the central magnetic leg 21 of the closed magnetic path magnetic core 2 is inserted into the through hole 11 of the bobbin 1 and incorporated in the bobbin 1, and the coil is wound around the bobbin 1. That is, the bobbin 1 is inserted into the through guide hole 18 from the outside to the inside.

  Further, as a guide mechanism for inserting the center magnetic core 3 into the bobbin 1 from the outside to the inside, a convex portion provided inside the through guide hole 18 corresponding to the concave portion 32 or the convex portion 31 of the center magnetic core 3. 18b or recess 18a is provided.

As for the means for fixing the center magnetic core 3, a jig insertion hole 1 d corresponding to the position correction processing portion is provided in the bobbin 1, a jig is inserted therein, and the center magnetic core 3 is inserted facing the bobbin 1. By pressing the position correction processing portion, the center magnetic core 3 slides outward of the bobbin 1, the inclined portion 35 abuts on the positioning portion 44 provided on the terminal block 4, and the notch 43 of the bobbin 1. The center magnetic core 3 is fixed to the closed magnetic path magnetic core 2 and the bobbin 1 by applying an adhesive.

Since the structure is as described above, the center magnetic core 3 can be mounted after the coil is wound around the bobbin 1 as an effect of the present invention, so that the problem of misalignment of the center magnetic core 3 at the time of winding does not occur. Normal mode characteristics are stable.

Further, since there is a guide mechanism for inserting the center magnetic core 3 into the bobbin 1, the center magnetic core 3 can be easily inserted into the through guide hole 18 and the workability is improved.

Also, the elastic locking piece 1c for holding the center magnetic core 3 is not provided, and since the locking piece 1c is an elastic body, the center magnetic core 3 is misaligned by opening outward over time. There is no end.

  As described above, the present invention is not limited to the above-described embodiments, and can be implemented with appropriate modifications without departing from the spirit of the present invention.

It is a disassembled perspective view of the line filter in one embodiment of the present invention. It is a perspective view of the line filter used for the Example of this invention. It is a perspective view of the center magnetic core used for the Example of this invention. It is a perspective view of the center magnetic core in other embodiment of this invention. It is a front view before arrange | positioning a center magnetic core in the bobbin after the coil winding used for the Example of this invention. It is sectional drawing which inserted the center magnetic core in the bobbin after the coil winding used for the Example of this invention. It is sectional drawing which combined the bobbin and the terminal block about the center magnetic core used for the Example of this invention. It is sectional drawing of the line filter used for the Example of this invention. It is a perspective view of the conventional line filter. It is a perspective view of the center magnetic core of the conventional line filter. It is a perspective view of the bobbin of the conventional line filter.

DESCRIPTION OF SYMBOLS 1 Bobbin 1a Recessed part 1b Passing window 1c Locking piece 1d Jig insertion hole 11 Through hole 12 Outer flange part 13 One winding 14 The other winding 15 Middle collar part 16 Split collar part 17 Gear 18 Through guide hole 18a Recessed part 18b Convex part 2 Closed magnetic path core 21 Central magnetic leg 22 Both end magnetic leg 3 Center magnetic core 3a Protrusion part 31 Convex part 32 Concave part 33 Corner part 34 Outer surface part 35 Inclined part 36 Opposite face part 4 Terminal block 41 Opening part 42 Insulating wall 43 Notch Part 44 positioning part 45 bobbin receiving part 51 terminal

Claims (8)

A bobbin having a through hole in the central shaft and outer flanges at both ends of the outer periphery, a Japanese-shaped closed magnetic path magnetic core with a central magnetic leg inserted into the through hole of the bobbin, and one wound around the bobbin In the line filter comprising the winding and the other winding, a center magnetic core inserted into the bobbin, and a terminal block holding the closed magnetic path magnetic core,
The bobbin has a middle flange portion into which the center magnetic core that divides the one winding and the other winding is inserted in a substantially center of the outer collar portion,
The intermediate collar portion has a through guide hole having a guide function for sliding the center magnetic core,
The terminal block is provided with an insulating wall that insulates the one winding wound around the bobbin, the other winding, and the closed magnetic path magnetic core surrounding the winding, and is a portion facing the middle flange portion A line filter having a positioning portion for positioning the center magnetic core. 2. The line filter according to claim 1, wherein the positioning unit is a positioning unit for fixing the position by moving the center magnetic core in the through guide hole in the outer peripheral direction of the bobbin. The center magnetic core has a position correction processing portion on at least one of the surfaces facing the central magnetic leg,
The bobbin has a jig insertion hole corresponding to the position correction processing portion, inserts a jig from the jig insertion hole, pressurizes the position correction processing portion, and the center magnetic core is The line filter according to claim 1, further comprising a means fixed to the positioning portion.   The said guide mechanism is a convex part or recessed part provided in the inside of the said penetration guide hole corresponding to the recessed part or convex part which the said center magnetic core has, The any one of Claim 1 thru | or 3 characterized by the above-mentioned. Line filter as described in   5. The line filter according to claim 1, wherein the center magnetic core is fixed to the positioning portion at a non-contact position with the closed magnetic path magnetic core.   A central magnetic leg of a closed magnetic path magnetic core is inserted into the central axis of the bobbin, the bobbin is combined, and after winding the one winding and the other winding on the bobbin, the center magnetic core is The positioning portion is inserted into the through guide hole of the bobbin from the outside to the inside, and the closed magnetic path magnetic core is fixed to the terminal block, and then the center magnetic core is moved in the through guide hole in the outer peripheral direction of the bobbin. The method of manufacturing a line filter according to claim 1, wherein the position is fixed to the line filter. The center magnetic core has a position correction processing part on at least one of the surfaces facing the central magnetic leg, and the bobbin has a jig insertion hole corresponding to the position correction processing part, By inserting a jig from the jig insertion hole and pressurizing the position correction processing portion,
The method for manufacturing a line filter according to claim 6, wherein the center magnetic core is moved in an outer peripheral direction of the bobbin within the through guide hole to fix the position to the positioning portion. The line according to claim 6, wherein the bobbin is pressed with a jig to move the center magnetic core in the through guide hole in the outer peripheral direction of the bobbin to fix the position to the positioning portion. A method for manufacturing a filter.

Images