Noise Filter

Abstract

A noise filter is provided that can improve noise removal performance with a simple structure. The noise filter (10) includes a connector (20) that stores a terminal part (22) connected to an input / output wire (WH) in a state where the input / output wire (WH) is led out. The noise filter (10) includes: a coil (40) connected to the input / output wire (WH); a capacitor (30) electrically connected to the coil (40); and a magnetic member (50). The noise filter (10) includes: a housing (60) that stores the capacitor (30), the coil (40) and the magnetic member (50); and a retaining member (70) that retains the magnetic member (50) in a state where it is positioned relative to the coil (40).

Description

Technical Field

[0001] The present invention relates to noise filters. Background Art

[0002] The noise filter of patent document 1 is a structure sandwiched between two conductive paths. The noise filter includes a housing, a grounding conductor, a first conductor, and a second conductor. The housing accommodates the grounding conductor, the first conductor, and the second conductor. The grounding conductor has an electrical contact portion with a conductive member such as a vehicle body. The first conductor is connected to a conductive path introduced through a through hole on one side of one surface of the housing. The second conductor is connected to a conductive path introduced through a through hole on the other side of one surface of the housing. The grounding conductor is connected to the first conductor and the second conductor via a capacitor. In addition, the first conductor is connected to the second conductor via an inductance layer arranged on the outside of the housing. The inductance layer includes an axis and a coil wound around the axis.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2016-208487 Summary of the invention

[0006] Problems to be solved by the invention

[0007] Since the inductance layer of the noise filter of Patent Document 1 is arranged outside the box, the magnetic flux generated by the coil is easily leaked to the outside. Therefore, the inductance of the coil of the noise filter may be reduced, thereby reducing the noise removal performance. In a noise filter with such a structure, in order to increase the inductance of the coil, it is considered to cover the inductance layer with a magnetic body. However, in this structure, it is necessary to add a new component outside the box, so that the structure of the noise filter becomes complicated.

[0008] The present invention has been made based on the above-mentioned circumstances, and an object of the present invention is to provide a noise filter capable of improving noise removal performance with a simple structure.

[0009] Solutions to Solve Problems

[0010] The noise filter of the present invention is characterized by comprising:

[0011] A connector that receives a terminal part connected with a wire so that the wire can be led out;

[0012] a coil connected to the wire;

[0013] a capacitor electrically connected to the coil;

[0014] Magnetic components;

[0015] a housing for housing the capacitor, the coil, and the magnetic member; and

[0016] A holding member holds the magnetic member in a state of being positioned relative to the coil.

[0017] Effects of the Invention

[0018] The noise filter is connected to a wire connected to a terminal part with a coil and a capacitor. Therefore, the noise filter can remove the noise generated by the wire using the coil and the capacitor. On this basis, the noise filter is in a housing containing the coil, and the magnetic component is positioned relative to the coil by a holding component. Therefore, the leakage of magnetic flux generated from the coil can be suppressed, and the reduction of inductance can be suppressed. In this way, the noise filter can improve the noise removal performance of the coil by a simple structure in which the magnetic component is held by the holding component. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a plan view showing a part of the noise filter according to the first embodiment.

[0020] Figure 2 It is a top view showing a part of the noise filter of Example 2.

[0021] Figure 3 It is a top view showing a part of the noise filter of Example 3.

[0022] Figure 4 It is a side cross-sectional view showing a part of the noise filter of the fourth embodiment. DETAILED DESCRIPTION

[0023] In the present invention, the holding member may be in a container shape and disposed inside the coil, and the magnetic member may be accommodated in the holding member.

[0024] According to this configuration, the noise filter can increase the inductance by arranging the magnetic member inside the coil.

[0025] In the present invention, the holding member may be made of an insulating material.

[0026] According to this structure, the magnetic member is accommodated in the holding member made of an insulating material. Therefore, it is possible to prevent electrical corrosion caused by direct contact between the magnetic member and the coil.

[0027] In the present invention, the holding member may be made of a magnetic material, and the magnetic member may be held by the holding member so as to surround the coil and form a closed magnetic path around the coil.

[0028] According to this configuration, a closed magnetic path is formed around the coil by the magnetic member surrounding the coil. Therefore, the noise filter can suppress leakage of magnetic flux generated from the coil and can increase the inductance of the coil.

[0029] In the present invention, a plurality of the magnetic members may be arranged at intervals around the coil so as to surround the coil.

[0030] According to this structure, since the noise filter is configured in a manner that multiple magnetic components surround the coil, it is easy to suppress the leakage of magnetic flux generated from the coil and to increase the inductance of the coil. On this basis, since the noise filter is configured around the coil with multiple magnetic components spaced apart, it is possible to achieve light weight and low cost compared to a structure in which the magnetic components are configured around the coil as a whole.

[0031] In the present invention, the holding member may be fixedly provided on the inner surface of the housing.

[0032] According to this structure, the magnetic member can be arranged along the inner surface of the casing.

[0033] The present invention may be such that the magnetic member is in the form of a thin plate, the retaining member is opposed to the inner surface of the shell with a gap therebetween, and the magnetic member is inserted into the gap to be held between the retaining member and the inner surface of the shell.

[0034] According to this structure, the magnetic member can be easily assembled to the housing in a positioned state by being inserted into the gap between the holding member and the inner surface of the housing. As a method of positioning the magnetic member, the inner surface of the housing is used, so the shape of the holding member can be simplified compared to the case where the magnetic member is positioned only by the holding member.

[0035] The present invention may also be a grounding component for grounding that is electrically connected to the capacitor, the grounding component having: a flat grounding plate portion that supports the coil and the capacitor; an assembly portion that extends from the grounding plate portion and is assembled to the grounding component for grounding; and a pressure-receiving portion that is upright from the grounding plate portion and receives pressing force from the side opposite to the coil and the capacitor; by applying pressing force to the pressure-receiving portion, the grounding component is assembled to the housing.

[0036] According to this structure, the coil, capacitor and grounding member can be assembled to the housing only by a single action of pressing the pressure receiving portion, so the operability is excellent. Moreover, when assembling to the housing, the coil and capacitor do not need to be touched, so there is no possibility of damaging the coil and capacitor.

[0037] <Example 1>

[0038] Below, refer to Figure 1 A first embodiment of the noise filter of the present invention will be described. In the following description, the front and rear directions are Figure 1 The lower side is defined as the front side, and the upper side is defined as the rear side. Figure 1 The directions indicated are defined as left and right. Figure 1 The front side is defined as the upper side, and the rear side is defined as the lower side.

[0039] like Figure 1 As shown in FIG. 1 , the noise filter 10 of the present embodiment includes a connector 20, a capacitor 30, a coil 40, a magnetic member 50, a housing 60, and a holding member 70. The housing 60 accommodates the capacitor 30, the coil 40, the magnetic member 50, and the holding member 70. Figure 1 In the figure, the coil 40, the magnetic member 50 and the retaining member 70 are shown on the left side, but the coil 40, the magnetic member 50 and the retaining member 70 of the same structure are also provided on the right side inside the housing 60. The housing 60 is made of, for example, synthetic resin. The housing 60 includes a lower housing 61 and an upper housing (not shown). The lower housing 61 is, for example, in the shape of a box with an opening at the top. The upper housing is in the shape of a box that can close the opening at the top of the lower housing 61. The housing 60 is formed with a pair of insertion holes 62 (in the housing 60) through which the input and output wires WH described later can be inserted. Figure 1 In the figure, only one party is indicated).

[0040] The connector 20 is connected to a harness-side conductive path (not shown) constituting the input / output wires WH. Figure 1 As shown, the connector 20 includes a housing 21 and a terminal part 22. The terminal part 22 is connected to one end WH1 of the input / output wire WH (equivalent to the "conducting wire" of the present invention). The other end WH2 of the input / output wire WH is connected to the conductive plate 25 by soldering. The housing 21 is box-shaped and has a through hole (not shown) through which the input / output wire WH is inserted. The housing 21 accommodates the terminal part 22 in a state where the other end WH2 of the input / output wire WH is led out. In addition, regarding the connector 20, Figure 1 Only the terminal fitting 22 on the left side is shown in the figure, but a terminal fitting 22 with the same structure is also stored on the right side of the box body 21.

[0041] like Figure 1 As shown, the coil 40 is formed by winding an uncoated metal wire. One end 41 and the other end 42 of the coil 40 are led out at a predetermined height in a manner facing opposite directions to each other. One end 41 of the coil 40 is connected to the conductive plate 25 by soldering. The other end 42 of the coil 40 is connected to one electrode of the capacitor 30 by soldering.

[0042] The magnetic member 50 is a powder made of a magnetic material such as iron. The magnetic member 50 is, for example, ferrite or iron powder. The magnetic member 50 is held by the holding member 70 so as to surround the coil 40 and form a closed magnetic path around the coil 40 .

[0043] like Figure 1 As shown, the holding member 70 is a box-shaped body with a substantially rectangular shape. The holding member 70 is made of a magnetic material. The holding member 70 includes a front box portion 71 and a rear wall portion 72. The front box portion 71 is a box-shaped body with an opening at the rear. The rear wall portion 72 is assembled to the front box portion 71 in a manner that closes the opening of the front box portion 71. The holding member 70 is fixed to the bottom surface of the housing 60. The holding member 70 is formed with insertion holes 73 and 74 at the center of a pair of wall portions opposed in the front-to-back direction. The holding member 70 is provided with a coil 40 and a magnetic member 50 inside. One end 41 of the coil 40 is inserted into the insertion hole 73. The other end 42 of the coil 40 is inserted into the insertion hole 74. The insertion holes 73 and 74 have a function as a structure for positioning the coil 40 relative to the holding member 70. The coil 40 is located at the center of the holding member 70 in the left-right direction and the up-down direction. The magnetic member 50 is filled between the coil 40 and the holding member 70. Specifically, the magnetic member 50 is filled inside the coil 40 and between the outer periphery of the coil 40 and the holding member 70. In this way, the holding member 70 holds the magnetic member 50 in a state of being positioned relative to the coil 40. The coil 40 and the magnetic member 50 are positioned by the holding member 70.

[0044] The capacitor 30 is, for example, a film capacitor. Figure 1 As shown, the capacitor 30 is electrically connected to the coil 40. Specifically, the electrode on the left side of the capacitor 30 is connected to the other end 42 of the coil 40. Figure 1 Only the left coil 40 is shown in the figure, but the other end of the right coil (not shown) is connected to the right electrode of the capacitor 30.

[0045] The noise filter 10 constructed as above can remove the noise generated by the harness-side conductive path by connecting the connector 20 to the harness-side conductive path (not shown), using the coil 40 and the capacitor 30. On this basis, the coil 40 is surrounded by the magnetic member 50 in the holding member 70 formed of a magnetic material. Therefore, the noise filter 10 can suppress the leakage of the magnetic flux generated from the coil 40, thereby improving the inductance of the coil 40. In this way, the noise filter 10 can improve the noise removal performance with a simple structure without changing the appearance shape of the housing 60, etc. by filling the magnetic member 50 in the holding member 70 in which the coil 40 is stored.

[0046] Next, a description will be given of a process for assembling the coil 40 to the holding member 70 .

[0047] First, if Figure 1 As shown, the capacitor 30 and the holding member 70 are set to a state of being assembled on the bottom surface of the housing 60. The holding member 70 is set to a state where the opening of the front box portion 71 is not closed by the rear wall portion 72. And, the coil 40 is allowed to enter the interior of the front box portion 71 from the one end 41 side through the opening. At this time, one end 41 of the coil 40 is inserted into the insertion hole 73 and soldered to the conductive plate 25. Then, the magnetic member 50 is filled into the holding member 70. The magnetic member 50 is filled between the coil 40 and the holding member 70. Specifically, the magnetic member 50 is filled into the interior of the coil 40 and between the outer periphery of the coil 40 and the holding member 70. Next, the other end 42 of the coil 40 is inserted into the insertion hole 74 of the rear wall portion 72, and the opening of the front box portion 71 is closed by the rear wall portion 72. At this time, the other end 42 of the coil 40 is as Figure 1 Therefore, the other end 42 of the coil 40 is bent so that the coil 40 is in a state of extending backward as shown in the imaginary line (double dotted line). Figure 1 The coil 40 overlaps the left electrode of the capacitor 30 as shown by the solid line. The other end 42 of the coil 40 is connected to the left electrode of the capacitor 30 by soldering. The right coil (not shown) is assembled to the holding member 70 by the same process.

[0048] As described above, in the noise filter 10 of the present embodiment 1, the noise filter 10 is connected to the input and output wires WH connected to the terminal parts 22 with the coil 40 and the capacitor 30. Therefore, the noise filter 10 can remove the noise generated by the input and output wires WH by the coil 40 and the capacitor 30. On this basis, the noise filter 10 is in the housing 60 in which the coil 40 is stored, and the magnetic member 50 is positioned on the coil 40 by the holding member 70. Therefore, the leakage of the magnetic flux generated from the coil 40 can be suppressed, and the reduction of inductance can be suppressed. In this way, the noise filter 10 can improve the noise removal performance of the coil 40 by a simple structure in which the magnetic member 50 is held by the holding member 70.

[0049] The holding member 70 of the noise filter 10 is made of a magnetic material. The magnetic member 50 is held by the holding member 70 so as to surround the coil 40 and form a closed magnetic path around the coil 40 .

[0050] Thus, a closed magnetic path is formed around the coil 40 by the magnetic member 50 surrounding the coil 40. Therefore, the noise filter 10 can suppress leakage of magnetic flux generated from the coil 40 and can improve the inductance of the coil 40.

[0051] <Example 2>

[0052] Next, refer to Figure 2The second embodiment of the present invention will be described. The noise filter 10 of the second embodiment has a holding member structure different from that of the first embodiment. The other structures are the same as those of the first embodiment, so the same reference numerals are given to the same structures, and the description of the structure, function, and effect will be omitted.

[0053] like Figure 2 As shown, the holding member 270 is in the shape of a container, which is a cylindrical shape with both ends closed. The holding member 270 is made of insulating material. The holding member 270 includes a front box portion 271 and a rear wall portion 272. The front box portion 271 is in the shape of a box with an opening at the rear. The rear wall portion 272 is assembled to the front box portion 271 in a manner that closes the opening of the front box portion 271. The holding member 270 is fixed to the bottom surface of the housing 60 (not shown). The holding member 270 is arranged inside the coil 40. Specifically, the coil 40 is composed of an uncoated metal wire, which is wound around the outer periphery of the holding member 270 and positioned on the holding member 270. The outer peripheral surface of the holding member 270 is in contact with the inner peripheral surface of the coil 40. One end 41 of the coil 40 extends to the front side of the holding member 270. The other end 42 of the coil 40 extends to the rear side of the holding member 270. The magnetic member 50 is made of powder of a magnetic material, and is stored so as to fill the inside of the holding member 270. In this way, the holding member 270 holds the magnetic member 50 in a state where it is positioned with respect to the coil 40.

[0054] The noise filter 10 constructed as above plays the role of removing the noise generated by the conductive path on the harness side, similarly to the noise filter 10 of Example 1. On this basis, the noise filter 10 can improve the inductance of the coil 40 by configuring the magnetic member 50 to be positioned inside the coil 40. In addition, since the magnetic member 50 is accommodated in the holding member 270 composed of an insulating material, electrical corrosion caused by direct contact between the magnetic member 50 and the coil 40 can be prevented. In this way, the noise filter 10 can improve the noise removal performance with a simple structure without changing the appearance shape of the housing 60, by filling the magnetic member 50 in the holding member 270 arranged inside the coil 40.

[0055] Next, the process of assembling the coil 40 to the holding member 270 will be described.

[0056] and Figure 1Similarly, the capacitor 30 is prepared in a state of being arranged on the bottom surface of the housing 60. And, one end 41 of the coil 40 wound around the outer periphery of the retaining member 270 is soldered to the conductive plate 25. Next, the retaining member 270 is formed in a state where the opening of the front box portion 271 is not closed by the rear wall portion 272. Next, the magnetic member 50 is filled into the retaining member 270. Next, the opening of the front box portion 271 is closed by the rear wall portion 272. Then, the other end 42 of the coil 40 and the capacitor 30 (see Example 1) are connected. Figure 1 ) is connected to the electrode on the left side. In addition, the coil 40 on the right side is assembled to the holding member 270 through the same process.

[0057] In the noise filter 10 of the second embodiment, the holding member 270 is in a container shape and is disposed inside the coil 40 . The magnetic member 50 is accommodated in the holding member 270 .

[0058] Thus, the noise filter 10 can increase the inductance by arranging the magnetic member 50 inside the coil 40 .

[0059] In addition, the magnetic member 50 of the noise filter 10 is accommodated in the holding member 270 made of an insulating material. Therefore, it is possible to prevent electrical corrosion caused by direct contact between the magnetic member 50 and the coil 40.

[0060] <Example 3>

[0061] Next, refer to Figure 3 The third embodiment of the present invention is described. The noise filter 10 of the third embodiment has a different structure inside the housing from that of the first embodiment. The other structures are the same as those of the first embodiment, so the same reference numerals are used for the same structures, and the description of the structures, functions, and effects is omitted. Figure 3 The lower side is defined as the front side, and the upper side is defined as the rear side. Figure 3 The directions indicated are defined as left and right. Figure 3 The front side is defined as the upper side, and the rear side is defined as the lower side.

[0062] like Figure 3 As shown, the noise filter 10 of the third embodiment includes a connector (not shown), a pair of capacitors 30, a coil 40, a magnetic member 50, a housing 360, a holding member 70, and a grounding member 80. The housing 360 is formed in a box shape. The housing 360 is formed with insertion holes 363 and 364. The insertion hole 363 is formed in the wall portion of the front side of the housing 360 and in the central part in the left-right direction as a slit shape that is long in the left-right direction. The insertion hole 364 is formed in the wall portion of the rear side of the housing 360 and in the central part in the left-right direction as a hole larger than the insertion hole 363.

[0063] The grounding member 80 is a member for grounding that is electrically connected to the capacitor 30. The grounding member 80 is formed by punching and bending a conductive plate-shaped member such as a copper alloy. Figure 3 As shown, the grounding member 80 includes a grounding plate portion 81, an assembly portion 82 and a pressure receiving portion 83. The grounding plate portion 81 is a flat plate in a quadrilateral shape when viewed from above. The grounding plate portion 81 is arranged on the lower surface side of the housing 360 and covers most of the lower surface of the housing 360. The grounding plate portion 81 supports the coil 40 and the capacitor 30. The assembly portion 82 extends forward from the housing 360. The assembly portion 82 is inserted into the insertion hole 363 of the housing 360 from the rear. The assembly portion 82 is formed with a perfectly circular bolt hole 84 in the center. The noise filter 10 is fixed to a vehicle body panel (not shown) or the like by tightening bolts with the bolt hole 84. The pressure receiving portion 83 stands up approximately vertically upward from the edge of the rear side of the grounding plate portion 81. The grounding member 80 is assembled to the housing 360 by applying a pressing force from the rear to the pressure receiving portion 83.

[0064] A pair of capacitors 30 and a coil 40 constitute a π-type filter circuit. One end 41 of the coil 40 is connected to the input / output wire WH at the contact point P1. The other end 42 of the coil 40 is connected to the input / output wire WH at the contact point P2. The holding member 70 is arranged adjacent to the front of the pressure receiving portion 83 on the upper surface of the grounding plate portion 81. The magnetic member 50 is composed of powder of magnetic material and is filled into the interior of the holding member 70 as in the first embodiment. The pair of capacitors 30 are, for example, of the same type and capacity. One electrode of the capacitor 30 on the left is connected to one end 41 of the coil 40 and the input / output wire WH at the contact point P1. The other electrode of the capacitor 30 on the left is connected to the grounding plate portion 81 at the contact point P3. One electrode of the capacitor 30 on the right is connected to the other end 42 of the coil 40 and the input / output wire WH at the contact point P2. The other electrode of the capacitor 30 on the right is connected to the grounding plate portion 81 at the contact point P4.

[0065] Next, a process of assembling the grounding member 80 to the housing 360 will be described.

[0066] like Figure 3As shown, the input / output wire WH, the capacitor 30, the coil 40 and the holding member 70 are prepared in a state of being assembled to the grounding member 80. And the grounding member 80 is assembled into the inside of the housing 360 through the insertion hole 364 from the rear of the housing 360. At this time, the grounding member 80 inserts the assembly part 82 into the insertion hole 364 facing forward, and applies a forward pressing force to the pressure receiving part 83 from the rear. That is, the operator presses the pressure receiving part 83 from the side opposite to the coil 40 and the capacitor 30. Therefore, the operator does not need to contact the coil 40 and the capacitor 30, so it is impossible to damage the coil 40 and the capacitor 30. The assembly part 82 is inserted into the insertion hole 363 of the housing 360. The grounding member 80 is fixed in a state where the grounding plate part 81 contacts the wall part of the front side of the housing 360. In this way, the coil 40, the capacitor 30 and the grounding member 80 can be assembled to the housing 360 only by the single action of pressing the pressure receiving part 83, so the operability is excellent.

[0067] As described above, the noise filter 10 of the third embodiment includes a grounding member 80 for grounding electrically connected to the capacitor 30. The grounding member 80 includes a grounding plate portion 81, an assembly portion 82, and a pressure receiving portion 83. The grounding plate portion 81 is a flat plate that supports the coil 40 and the capacitor 30. The assembly portion 82 extends from the grounding plate portion 81 and is assembled to the grounding member to be grounded. The pressure receiving portion 83 is a shape that stands up from the grounding plate portion 81 and receives a pressing force from the side opposite to the coil 40 and the capacitor 30. By applying a pressing force to the pressure receiving portion 83, the grounding member 80 is assembled to the housing 360.

[0068] Thus, the coil 40, the capacitor 30, and the grounding member 80 can be assembled to the housing 360 by only a single action of pressing the pressure receiving portion 83, so the operability is excellent. Moreover, when assembling to the housing 360, there is no need to contact the coil 40 and the capacitor 30, so there is no possibility of damaging the coil 40 and the capacitor 30.

[0069] <Example 4>

[0070] Next, refer to Figure 4 The fourth embodiment of the present invention is described. The noise filter 10 of the fourth embodiment has a magnetic component and a retaining component structure different from that of the first embodiment. The other structures are the same as those of the first embodiment, so the same reference numerals are used for the same structures, and the description of the structure, function and effect is omitted. In the following description, the front and rear directions are Figure 4 The directions indicated by are defined as forward and backward. Figure 4 The directions indicated are defined as left and right. Figure 4 The directions indicated are defined as upward and downward.

[0071] like Figure 4 As shown, the noise filter 10 of the fourth embodiment includes a connector (not shown), a capacitor 30, a pair of coils 40, a magnetic member 450 and a holding member 470. The connector, the capacitor 30 and the coil 40 are the same structures as those of the first embodiment. The capacitor 30 and the coil 40 are positioned and assembled in the housing 460. The housing 460 is made of synthetic resin, for example. The housing 460 includes a box portion 461 and a top portion 462. The box portion 461 is in the shape of a box with an upper opening. The top portion 462 is in the shape of a plate that can close the upper opening of the box portion 461. The top portion 462 is pressed into the opening of the box portion 461. The housing 460 is formed with a pair of insertion holes (not shown) through which the input and output wires WH can be inserted, as in the first embodiment.

[0072] like Figure 4 As shown, the holding member 470 is fixedly provided on the inner surface of the side wall of the housing 460. Specifically, a plurality of holding members 470 are arranged around the coil 40 at intervals so as to surround the coil 40. Figure 4 In the embodiment, two holding members 470 are provided on each side wall of the housing 460. The holding member 470 is provided at the center of the side wall of the housing 460 in the up-down direction in a manner separated from the top 462. The holding member 470 includes a storage portion 471 and a fixing portion 472. The storage portion 471 is formed with a recessed portion 473 having a square shape. The fixing portion 472 is a square shape. The fixing portion 472 is a portion assembled to the inner surface of the housing 460. The recessed portion 473 of the holding member 470 is in a state of being opposed to the inner surface of the housing 460 with a gap S between them. The holding member 470 is provided on the inner surface of the housing 460 in a manner that the recessed portion 473 of the storage portion 471 opens upward.

[0073] like Figure 4 As shown, the magnetic member 450 is in the shape of a thin plate. The magnetic member 450 is inserted into the gap S from above the holding member 470, so that it is sandwiched and held by the inner surface of the holding member 470 and the housing 460. The magnetic member 450 held by the holding member 470 is positioned relative to the coil 40 and the housing 460. Because the holding member 470 is fixed to the inner surface of the side wall of the housing 460, the magnetic member 450 can be arranged along the inner surface of the housing 460. The magnetic member 450 can be easily assembled to the housing 460 in a positioned state by being inserted into the gap S. The holding member 470 can simplify the shape by utilizing the inner surface of the housing 460. A plurality of magnetic members 450 are arranged around the coil 40 at intervals to surround the coil 40. The magnetic member 450 contacts the lower surface of the top 462 of the housing 460 and is prevented from detaching.

[0074] The noise filter 10 constructed as above is easy to suppress the leakage of magnetic flux generated from the coil 40 and to increase the inductance of the coil 40 because the plurality of magnetic members 450 are arranged around the coil 40 at intervals, so that the noise filter 10 can achieve light weight and low cost compared to a structure in which the magnetic members 450 are arranged around the entire coil 40.

[0075] As described above, in the noise filter 10 of the fourth embodiment, the magnetic member 450 is in the form of a thin plate. The holding member 470 is in a state facing the inner surface of the housing 460 with a gap S therebetween. The magnetic member 450 is inserted into the gap S, and is held by being sandwiched between the holding member 470 and the inner surface of the housing 460.

[0076] Thus, the magnetic member 450 can be easily assembled to the housing 460 in a positioned state by being inserted into the gap S between the holding member 470 and the inner surface of the housing 460. Since the inner surface of the housing 460 is used as a method for positioning the magnetic member 450, the shape of the holding member 470 can be simplified compared to the case where the magnetic member 450 is positioned only by the holding member 470.

[0077] <Other embodiments>

[0078] The present invention is not limited to the embodiments described in the above description and drawings, and for example, the following embodiments are also included in the technical scope of the present invention.

[0079] (1) In the above-mentioned embodiments 1 to 4, a film capacitor is used as the capacitor, but an electrolytic capacitor or a ceramic capacitor may also be used.

[0080] (2) In the above-mentioned Embodiments 1 to 4, the number of poles of the terminal fitting is set to 2, but it may be 3 or more.

[0081] (3) In the above-mentioned embodiments 1 to 4, the capacitor and the coil are connected by soldering, but laser welding, resistance welding, etc. may also be used.

[0082] (4) In the above-mentioned Embodiment 3, the powdery magnetic member 50 is filled inside the holding member 270. However, the magnetic member 50 may be a cylindrical solid.

[0083] (5) In the fourth embodiment, the holding member 470 and the housing 460 are separate bodies, but they may be integrated.

[0084] (6) In the fourth embodiment, two holding members 470 are disposed on each side surface of the housing 460 , but a number other than two may be disposed.

[0085] Description of Reference Numerals

[0086] 10: Noise filter

[0087] 20: Connector

[0088] 22: Terminal parts

[0089] 30: Capacitor

[0090] 40: Coil

[0091] 50, 450: Magnetic components

[0092] 60, 360, 460: Shell

[0093] 70, 270, 470: retaining components

[0094] 80: Grounding components

[0095] 81: Ground plate

[0096] 82: Assembly Department

[0097] 83: Pressure section

[0098] S: Clearance

[0099] WH: Input and output wires (conductors)

Claims

1. A noise filter, characterized in that: have: A connector that receives a terminal part connected with a wire so that the wire can be led out; a coil connected to the wire; a capacitor electrically connected to the coil; Magnetic components; A housing for accommodating the capacitor, the coil and the magnetic component; as well as a holding member for holding the magnetic member in a state of being positioned relative to the coil, The holding member is in a container shape and is arranged to surround the coil or be arranged inside the coil. The magnetic member is made of powder of a magnetic material and is filled at least inside the coil.

2. The noise filter according to claim 1, characterized in that The holding member is arranged inside the coil, The magnetic member is accommodated in the holding member.

3. The noise filter according to claim 2, characterized in that The holding member is made of an insulating material.

4. The noise filter according to claim 1, characterized in that The holding member is made of magnetic material. The magnetic member is held by the holding member so as to surround the coil and form a closed magnetic path around the coil.

5. The noise filter according to claim 4, characterized in that The plurality of magnetic members are arranged around the coil at intervals so as to surround the coil.

6. The noise filter according to claim 4, characterized in that The holding member is fixedly disposed on the inner surface of the housing.

7. The noise filter according to claim 5, characterized in that The holding member is fixedly disposed on the inner surface of the housing.

8. The noise filter according to any one of claims 1 to 7, characterized in that: A grounding member for grounding electrically connected to the capacitor is provided, The grounding member has: A flat ground plate portion supporting the coil and the capacitor; An assembly portion extending from the grounding plate portion and assembled on a grounding member to be grounded; as well as The pressure receiving portion is in a state of standing up from the ground plate portion and receiving a pressing force from a side opposite to the coil and the capacitor; The grounding member is assembled to the housing by applying a pressing force to the pressure receiving portion.

9. A noise filter, characterized in that: have: A connector that receives a terminal part connected with a wire so that the wire can be led out; a coil connected to the wire; a capacitor electrically connected to the coil; Magnetic components; A housing for accommodating the capacitor, the coil and the magnetic component; as well as a holding member for holding the magnetic member in a state of being positioned relative to the coil, The holding member is made of magnetic material. The magnetic member is held by the holding member so as to surround the coil and form a closed magnetic path around the coil.

10. The noise filter according to claim 9, characterized in that The plurality of magnetic members are arranged around the coil at intervals so as to surround the coil.

11. The noise filter according to claim 9, characterized in that The holding member is fixedly disposed on the inner surface of the housing.

12. The noise filter according to claim 11, characterized in that The magnetic member is in the shape of a thin plate, The holding member is opposed to the inner surface of the housing with a gap therebetween. The magnetic member is inserted into the gap to be held sandwiched between the holding member and the inner surface of the housing.

13. The noise filter according to any one of claims 9 to 12, characterized in that: A grounding member for grounding electrically connected to the capacitor is provided, The grounding member has: A flat ground plate portion supporting the coil and the capacitor; An assembly portion extending from the grounding plate portion and assembled on a grounding member to be grounded; as well as The pressure receiving portion is in a state of standing up from the ground plate portion and receiving a pressing force from a side opposite to the coil and the capacitor; The grounding member is assembled to the housing by applying a pressing force to the pressure receiving portion.

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