Noise filter

Abstract

To provide a noise filter that can electrically connect a shielding layer of a shielded cable to a ground portion and can stably maintain the electrical connection state.SOLUTION: A noise filter includes a magnetic core, a grounding member, and a case. The case includes a first case portion and a second case portion. The grounding member contacts the ground portion at the second contact portion. The second case portion is provided with a pressing portion that contacts the shielded cable and presses the shielded cable in a direction to bring it closer to the ground portion when the second case portion is attached to the first case portion. When the shielded cable is pressed by the pressing portion, the shielded cable presses the grounding member in a direction to bring it closer to the ground portion.SELECTED DRAWING: Figure 5

Description

Technical Field

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[0001] The present disclosure relates to a noise filter.

Background Art

[0002] A noise filter attached to a shielded cable is known (see, for example, Patent Document 1). The noise filter described in Patent Document 1 includes a split magnetic core and a holder case made of conductive resin or to which a conductive foil is added. By using such a noise filter, the magnetic core can be disposed inside a shield structure constituted by a shield braid of the shielded cable and the holder case.

Prior Art Documents

[0006] In one aspect of this disclosure, it is desirable to provide a noise filter that can electrically connect the shielding layer and the ground portion of a shielded cable and stably maintain that electrical connection state. [Means for solving the problem]

[0007] (1) One aspect of the present disclosure is a noise filter to be attached to a shielded cable, comprising a magnetic core, a ground member, and a case. The magnetic core has a first segmented core and a second segmented core, each made of a magnetic material, and is a cylindrical magnetic body formed by combining the first segmented core and the second segmented core. The ground member is made of a conductive material and has a first contact portion and a second contact portion, and electrically connects the shielding layer and the ground portion by contacting an exposed portion of the shielding layer of the shielded cable with the first contact portion, while contacting a ground portion having a ground potential with the second contact portion. The case has a first case component and a second case component, the second case component is configured to be attachable to the first case component, the first segmented core and the ground member are attached to the first case component, and the second segmented core is attached to the second case component. When the second case component is attached to the first case component with the shield cable positioned between the first and second case components, the shield cable is positioned to penetrate the case, and the first and second segmented cores are positioned to surround the outer circumference of the shield cable to form a magnetic core, and the ground member is configured to contact the exposed portion at the first contact portion. The second case component is provided with a pressing portion that contacts the shield cable and presses it toward the ground portion when the second case component is attached to the first case component, and when the shield cable is pressed by the pressing portion, the shield cable presses the ground member toward the ground portion, thereby increasing the contact pressure between the second contact portion and the ground portion compared to when the pressing portion is not provided.

[0008] With a noise filter configured in this way, when the second case component is attached to the first case component while the shield cable is positioned between the first and second case components, the shield cable is positioned to penetrate the case. At that time, the first and second segmented cores are positioned around the outer circumference of the shield cable to form a magnetic core. Therefore, the magnetic core can be attached to the outer circumference of the shield cable without having to insert one end of the shield cable into the inner circumference of the magnetic core. Thus, for example, it is possible to attach the magnetic core to a pre-wired shield cable as an add-on.

[0009] Furthermore, when the second case component is attached to the first case component, the ground member makes contact at the first contact point with the exposed portion of the shielding layer of the shielded cable that is exposed on the outer circumference. The ground member also makes contact with the ground portion at the second contact point. Therefore, the shielding layer and the ground portion can be electrically connected via the ground member, and the potential of the shielding layer can be brought to the ground potential.

[0010] Furthermore, when the second case component is attached to the first case component, the pressing portion contacts the shield cable and presses it toward the ground portion. At that time, the shield cable pressed by the pressing portion presses the ground member toward the ground portion. As a result, the contact pressure between the second contact portion and the ground portion is higher than when a similar pressing portion is not provided. Consequently, the electrical connection between the second contact portion and the ground portion can be maintained more stably than when a similar pressing portion is not provided.

[0011] (2) In one aspect of the present disclosure, the first contact portion may be composed of an elastic clamping piece that elastically deforms upon contact with the exposed portion and clamps the exposed portion with the elastic force generated by the elastic deformation.

[0012] In a noise filter configured in this way, the first contact portion is made up of the elastic clamping piece described above. Therefore, the elastic clamping piece elastically deforms upon contact with the exposed area, and the elastic force generated by this deformation clamps the exposed area. Consequently, compared to a case where the first contact portion does not elastically deform, the contact pressure between the first contact portion and the exposed area is increased, and the electrical connection between the first contact portion and the exposed area can be stably maintained.

[0013] (3) In one aspect of the present disclosure, the second contact portion may be composed of an elastic pressing piece that elastically deforms upon contact with the ground portion and presses the ground portion with the elastic force generated by the elastic deformation.

[0014] In a noise filter configured in this way, the second contact portion is composed of the elastic pressing piece described above. Therefore, the elastic pressing piece elastically deforms upon contact with the ground portion, and the elastic force generated by this deformation presses against the ground portion. Consequently, the contact pressure between the second contact portion and the ground portion is increased compared to a case where the second contact portion does not elastically deform, and the electrical connection between the second contact portion and the ground portion can be stably maintained.

[0015] (4) In one aspect of the present disclosure, the magnetic core and the ground member may be positioned adjacent to each other in the axial direction of the shield cable. The first case component may have two through holes through which the shafts of mounting screws pass when the first case component is attached to the mounting location. The two through holes may be formed in positions that are rotationally symmetric, with the same direction of penetration and their positions interchangeable by rotating the case 180 degrees along a plane perpendicular to the direction of penetration. The passage through which the shield cable passes in the case may be formed in a position that is rotationally symmetric, with no change in the position of the central axis of the passage before and after rotating the case 180 degrees so that the positions of the two through holes are interchanged.

[0016] With a noise filter configured in this way, the positions of the two through-holes can be swapped by rotating the case 180 degrees along a plane perpendicular to the direction of penetration of the through-holes. In this case, the position of the central axis of the passage through which the shield cable passes remains unchanged before and after the rotation. Since the magnetic core and ground member are positioned adjacent to each other in the axial direction of the shield cable, their positions will be swapped before and after the above rotation. Therefore, by rotating the noise filter 180 degrees, the positions of the magnetic core and ground member can be swapped without changing the position of the mounting screws or the position of the shield cable.

[0017] (5) In one aspect of the present disclosure, the case may be provided with a gripping portion that grips the shield cable from the outer circumference when the shield cable is placed in a passage position and the second case component is attached to the first case component, thereby suppressing relative displacement of the shield cable with respect to the case. The gripping portion may be provided at a position on the opposite side of the magnetic core from the ground member, at a position between the magnetic core and the ground member, and at a position on the opposite side of the ground member from the magnetic core.

[0018] With a noise filter configured in this way, the gripping portion grips the shield cable from the outer circumference, thereby suppressing relative displacement of the shield cable with respect to the case. Furthermore, the gripping portion is provided at positions opposite the ground member side with the magnetic core in between, between the magnetic core and the ground member, and on the opposite side of the magnetic core side with the ground member in between. Therefore, displacement of the shield cable can be suppressed on both the magnetic core side and the ground member side. [Brief explanation of the drawing]

[0019] [Figure 1]FIG. 1A is a perspective view of the noise filter with the case closed. FIG. 1B is a perspective view of the noise filter with the case open. [Figure 2] FIG. 2A is a plan view of the noise filter. FIG. 2B is a left side view of the noise filter. FIG. 2C is a front view of the noise filter. FIG. 2D is a right side view of the noise filter. FIG. 2E is a rear view of the noise filter. FIG. 2F is a bottom view of the noise filter. [Figure 3] FIG. 3A is a perspective view of the noise filter in a state where it is mounted on the shield cable and the case is closed. FIG. 3B is a perspective view of the noise filter in a state where it is mounted on the shield cable and the case is open. [Figure 4] FIG. 4A is a front view of the noise filter in a state where it is mounted on the shield cable. FIG. 4B is a cross-sectional view at the cutting position indicated by the line IVB-IVB in FIG. 4. [Figure 5] FIG. 5A is a perspective view of the ground member. FIG. 5B is a cross-sectional view at the cutting position indicated by the line VB-VB in FIG. 4. [Figure 6] FIG. 6A is a plan view of the case in an open state. FIG. 6B is a perspective view of the case in an open state.

BEST MODE FOR CARRYING OUT THE INVENTION

[0020] Next, the above-described noise filter will be described with exemplary embodiments. [Configuration of Noise Filter] As shown in FIGS. 1A, 1B, 2A, 2B, 2C, 2D, 2E, 2F, and 4B, the noise filter 1 includes a magnetic core 3, a ground member 5, and a case 7. This noise filter 1 is mounted on the shield cable 91 as shown in FIGS. 3A, 3B, and 4A.

[0021] As shown in FIGS. 1B and 3B, the magnetic core 3 has a first divided core 3A and a second divided core 3B. The first divided core 3A and the second divided core 3B are each made of a magnetic material (in this embodiment, ferrite). As shown in FIG. 4B, the magnetic core 3 is a cylindrical magnetic body formed by combining the first divided core 3A and the second divided core 3B.

[0022] As shown in FIGS. 1A, 1B, 3A, 3B, 5A, and 5B, the ground member 5 has a first contact portion 5A and a second contact portion 5B. The ground member 5 is made of a conductive material (in this embodiment, a copper alloy). The shield cable 91 illustrated in this embodiment has a structure in which four signal lines 93 are bundled, the outer periphery thereof is covered with a shield layer 95, and the outer periphery thereof is further covered with a sheath 97, as shown in FIG. 5B.

[0023] As shown in FIGS. 3B and 5B, the shield cable 91 is provided with an exposed portion where the shield layer 95 is exposed to the outer peripheral side by partially peeling off the sheath 97. The ground member 5 contacts the exposed portion of the shield layer 95 with the first contact portion 5A. Further, as shown in FIG. 5B, the ground member 5 contacts the ground portion 99 having a ground potential with the second contact portion 5B. Thereby, the ground member 5 electrically connects the shield layer 95 and the ground portion 99.

[0024] As shown in FIG. 5B, the first contact portion 5A is constituted by elastic clamping pieces that clamp the exposed portion of the shield layer 95 from both sides in the front-rear direction in the figure. In the unloaded state, this elastic clamping piece has a shape that forms a gap narrower than the diameter of the exposed portion of the shield layer 95. When the exposed portion of the shield layer 95 is introduced into the gap, the elastic clamping piece elastically deforms in a direction in which the gap expands with contact with the exposed portion, and clamps the exposed portion with the elastic force generated by the elastic deformation.

[0025] As shown in Figure 5B, the second contact portion 5B is composed of an elastic pressing piece that presses the ground portion 99 downwards in the figure. This elastic pressing piece elastically deforms upon contact with the ground portion 99, and the elastic force generated by this deformation presses against the ground portion 99.

[0026] Case 7 has a first case component 7A and a second case component 7B. In this embodiment, the first case component 7A and the second case component 7B are configured to be openable and closable by being connected via three hinge portions 7C, as shown in Figures 1A, 1B, 2E, 3A, 3B, 4B, and 5B. The first case component 7A is provided with three first engaging portions 11, as shown in Figures 4A and 4B, and the second case component 7B is provided with three second engaging portions 12.

[0027] When the first case component 7A and the second case component 7B are closed as shown in Figure 1A, the three first engaging parts 11 and the three second engaging parts 12 engage one-to-one, maintaining the closed state of the first case component 7A and the second case component 7B. When the engagement of the three first engaging parts 11 and the three second engaging parts 12 is released, the first case component 7A and the second case component 7B can be opened as shown in Figure 1B.

[0028] In this embodiment, the first case component 7A and the second case component 7B are integrally molded together with the hinge portion 7C from a resin material (polyamide in this embodiment). However, in order for the case 7 to have an openable and closable structure, it is sufficient that the second case component 7B is configured to be detachably attached to the first case component 7A. Therefore, whether or not to provide the hinge portion 7C is optional.

[0029] For example, instead of the hinge portion 7C, an engagement mechanism equivalent to the first engagement portion 11 and the second engagement portion 12 described above may be provided, thereby enabling the second case component 7B to be attached to and detached from the first case component 7A. That is, as long as the second case component 7B is configured to be attachable to the first case component 7A, the first case component 7A and the second case component 7B may be a single molded product connected via the hinge portion 7C, or they may be separate resin molded products that are not connected.

[0030] The first case component 7A is configured to be attachable to the mounting location. In this embodiment, the mounting location is the ground portion 99 (see Figure 5B) described above, and for example, a metal frame, panel, chassis, etc., can be used. In this embodiment, the first case component 7A is provided with two fixing portions 13, as shown in Figures 1A, 2A, and 2F. A through hole 15 is formed in each fixing portion 13.

[0031] When attaching the first case component 7A to the mounting location, for example, a female thread (i.e., a screw hole) is formed in the mounting location beforehand. Then, the shaft of a male thread (for example, a hexagonal bolt) is passed through the through hole 15 of the fixing part 13, the male thread is screwed into the female thread formed in the mounting location, and the male thread is tightened to fix the first case component 7A to the mounting location.

[0032] Alternatively, for example, a male thread (i.e., a screw shaft) can be pre-installed at the mounting location. Then, the first case component 7A can be positioned at the mounting location so that the male thread passes through the through hole 15 of the fixing part 13, and a female thread (for example, a hexagonal nut) can be screwed onto the male thread and tightened to fix the first case component 7A to the mounting location.

[0033] As shown in Figures 1B and 3B, the first case component 7A has the first segmented core 3A and the ground member 5 attached to it. As shown in Figures 6A and 6B, the first case component 7A has three claw portions 21 formed thereon, and as shown in Figure 4B, the first segmented core 3A is attached to the first case component 7A by hooking these claw portions 21 into the groove portions 23 of the first segmented core 3A. In addition, the first case component 7A is provided with two spring portions 25, as shown in Figures 2F and 4B. These two spring portions 25 elastically deform upon contact with the first segmented core 3A, and the elastic force generated by this elastic deformation biases the first segmented core 3A upward in the direction shown in Figure 4B.

[0034] As shown in Figures 1B and 3B, the second split core 3B is attached to the second case component 7B. As shown in Figures 6A and 6B, the second case component 7B has three claw portions 21 formed thereon, and as shown in Figure 4B, the second split core 3B is attached to the second case component 7B by these claw portions 21 catching on the groove portions 23 of the second split core 3B. In addition, the second case component 7B is provided with two spring portions 25, as shown in Figures 2A and 4B. These two spring portions 25 elastically deform upon contact with the second split core 3B, and the elastic force generated by this elastic deformation biases the second split core 3B downward in Figure 4B.

[0035] With these configurations, the first divided core 3A and the second divided core 3B are biased in a direction that increases the contact pressure between them, thereby improving the magnetic properties of the magnetic core 3. As shown in Figures 5B and 6A, the first case component 7A is provided with a snap portion 27. The gland member 5 is attached to the first case component 7A by inserting this snap portion 27 into the mounting hole 29 of the gland member 5 (see Figures 5A and 5B).

[0036] With the shielded cable 91 positioned between the first case component 7A and the second case component 7B, as shown in Figure 3B, when the second case component 7B is attached to the first case component 7A, the noise filter 1 is mounted on the outer circumference of the shielded cable 91, as shown in Figure 3A.

[0037] When the second case component 7B is attached to the first case component 7A, the shield cable 91 is positioned to penetrate the case 7, as shown in Figure 3A. The first divided core 3A and the second divided core 3B are positioned to surround the outer circumference of the shield cable 91, as shown in Figure 4B, to form the magnetic core 3. The ground member 5 contacts the exposed portion of the shield layer 95 at the first contact portion 5A, as shown in Figure 5B. The magnetic core 3 and the ground member 5 are positioned adjacent to each other in the axial direction of the shield cable 91.

[0038] Furthermore, in this embodiment, when the first case component 7A is attached to the mounting location, the ground member 5 contacts the ground portion 99 at the second contact portion 5B, as shown in Figure 5B. In this embodiment, the mounting location itself functions as the ground portion 99. However, a portion of the mounting location may be configured to function as the ground portion 99.

[0039] As shown in Figures 1B, 3B, and 5B, the second case component 7B is provided with a pressing portion 31. When the second case component 7B is attached to the first case component 7A, the pressing portion 31 contacts the shield cable 91 and presses it in a direction that brings the shield cable 91 closer to the gland portion 99, as shown in Figure 5B. When the shield cable 91 is pressed by the pressing portion 31, the shield cable 91 presses the gland member 5 in a direction that brings it closer to the gland portion 99. Therefore, when such a pressing portion 31 is provided, the contact pressure between the second contact portion 5B and the gland portion 99 is higher than when the pressing portion 31 is not provided.

[0040] Furthermore, when the shield cable 91 is positioned in the passage 33 (see Figures 2B and 2D) that penetrates the case 7, it is sandwiched between the pressing portion 31 and the gland member 5. As a result, the shield cable 91 is positioned straight between the pressing portion 31 and the gland member 5 at the position of the central axis C2 shown in Figures 2A, 2C, 2E, and 2F. Therefore, unlike the case where there is no configuration equivalent to the pressing portion 31, even if the shield cable 91 receives an elastic force from the first contact portion 5A, it is possible to suppress the bending of the shield cable 91 upward in the figure at the point where it receives the elastic force. Therefore, it is possible to prevent unnecessary load from being placed on the shield cable 91 due to the occurrence of such bending.

[0041] The two through holes 15 provided in the first case component 7A are formed in positions that exhibit rotational symmetry, allowing their positions to be swapped by rotating the case 7 180 degrees along a plane perpendicular to the through-direction (up and down direction in the figure). More specifically, the two through holes 15 possess rotational symmetry such that their positions are swapped when the case 7 is rotated 180 degrees around axis C1, shown in Figures 2B, 2C, 2D, and 2E, as the center of rotation.

[0042] The passage 33 through which the shield cable 91 passes in case 7 (see Figures 2B and 2D) is formed in a rotationally symmetrical position such that when case 7 is rotated 180 degrees so that the positions of the two through holes 15 are swapped, the position of the central axis C2 of the passage 33 shown in Figures 2A, 2C, 2E, and 2F does not change before and after the rotation.

[0043] Therefore, even if the case 7 is rotated 180 degrees around axis C1 as the center of rotation, and the positions of the two through holes 15 are swapped, the noise filter 1 can be attached to the mounting location without changing the position of the mounting screws or the shield cable 91. Thus, by rotating the noise filter 1 180 degrees, the positions of the magnetic core 3 and the ground member 5 can be swapped without changing the position of the mounting screws or the shield cable 91.

[0044] Case 7 is provided with a gripping portion 35, as shown in Figures 6A and 6B. The gripping portion 35 grips the shield cable 91 from the outer circumference when the second case component 7B is attached to the first case component 7A after the shield cable 91 has been placed in a position that forms a passage 33 (see Figures 2B and 2D). As a result, the gripping portion 35 suppresses relative displacement of the shield cable 91 with respect to the case 7.

[0045] In this embodiment, as shown in Figures 6A and 6B, the gripping portions 35 are provided at positions opposite to the ground member 5 side with the magnetic core 3 in between, at a position between the magnetic core 3 and the ground member 5, and at a position opposite to the magnetic core 3 side with the ground member 5 in between. By providing the gripping portions 35 at these positions, displacement of the shield cable 91 can be suppressed on both the magnetic core 3 side and the ground member 5 side.

[0046] [effect] With the noise filter 1 configured as described above, when the second case component 7B is attached to the first case component 7A while the shield cable 91 is positioned between the first case component 7A and the second case component 7B, the shield cable 91 is positioned to penetrate the case 7. At that time, the first divided core 3A and the second divided core 3B are positioned around the outer circumference of the shield cable 91 to form the magnetic core 3. Therefore, the magnetic core 3 can be attached to the outer circumference of the shield cable 91 without having to insert one end of the shield cable 91 into the inner circumference of the magnetic core 3. Thus, for example, it is possible to attach the magnetic core 3 to a pre-wired shield cable 91 as an add-on.

[0047] Furthermore, when the second case component 7B is attached to the first case component 7A, the ground member 5 makes contact with the exposed portion of the shielding layer 95 of the shielded cable 91 at the first contact portion 5A. The ground member 5 also makes contact with the ground portion 99 at the second contact portion 5B. Therefore, the shielding layer 95 and the ground portion 99 can be electrically connected via the ground member 5, and the potential of the shielding layer 95 can be brought to the ground potential.

[0048] Furthermore, when the second case component 7B is attached to the first case component 7A, the pressing portion 31 contacts the shield cable 91 and presses it toward the ground portion 99. At that time, the shield cable 91 pressed by the pressing portion 31 presses toward the ground member 5 toward the mounting location. As a result, the contact pressure between the second contact portion 5B and the ground portion 99 is higher than when a similar pressing portion 31 is not provided. Consequently, the electrical connection between the second contact portion 5B and the ground portion 99 can be maintained more stably than when a similar pressing portion 31 is not provided.

[0049] Furthermore, in this embodiment, the first contact portion 5A is composed of the elastic clamping piece described above. Therefore, compared to the case where the first contact portion 5A does not elastically deform, the contact pressure between the first contact portion 5A and the exposed portion is increased, and the electrical connection state between the first contact portion 5A and the exposed portion can be stably maintained.

[0050] Furthermore, in this embodiment, the second contact portion 5B is composed of the elastic pressing piece described above. Therefore, compared to the case where the second contact portion 5B does not elastically deform, the contact pressure between the second contact portion 5B and the ground portion 99 is increased, and the electrical connection state between the second contact portion 5B and the ground portion 99 can be stably maintained.

[0051] Furthermore, in this embodiment, by rotating the noise filter 1 by 180 degrees, the positions of the magnetic core 3 and the ground member 5 can be swapped without changing the position of the mounting screws or the position of the shield cable 91.

[0052] Furthermore, in this embodiment, since the gripping portion 35 is provided in the position described above, the displacement of the shield cable 91 can be suppressed on both the magnetic core 3 side and the ground member 5 side.

[0053] [Other embodiments] Although the noise filter 1 has been described above with reference to exemplary embodiments, the above-described embodiments are merely illustrative examples of one aspect of the present disclosure. In other words, the present disclosure is not limited to the above-described exemplary embodiments and can be implemented in various forms without departing from the technical idea of ​​the present disclosure.

[0054] For example, in the above embodiment, the elastic pressing piece constituting the second contact portion 5B had a shape that extended diagonally downward and forward and diagonally downward and backward as shown in the figure, but the elastic pressing piece may also have a shape that extends diagonally downward and left and diagonally downward and right as shown in the figure.

[0055] Furthermore, in the above embodiment, one magnetic core 3 and one ground member 5 were provided inside the case 7, but two or more magnetic cores 3 and ground members 5 may be provided. In that case, the arrangement order of the magnetic cores 3 and ground members 5 can be any order.

[0056] Furthermore, although the above embodiment described the magnetic core 3 as a cylindrical magnetic material, as is clear from Figure 4B, the term "cylindrical" as used herein is not limited to a strictly cylindrical shape, and any shape that allows the shield cable 91 to pass through the inner circumference of the magnetic core 3 is acceptable. For example, in the above embodiment, the outer circumference of the magnetic core 3 includes a portion composed of a curved surface, a portion composed of a flat surface, and a portion in which a groove 23 is formed, as shown in Figure 4B. Such a shape of the magnetic core 3 also corresponds to an example of a cylindrical shape as used herein.

[0057] In other words, the shape of the outer and inner surfaces of the cylindrical magnetic core 3 as described herein is not limited to a specific shape. Therefore, the shape of the outer and inner surfaces of the magnetic core 3 may be any of the following: a shape in which the cross-sectional shape perpendicular to the axial direction of the magnetic core 3 is circular, a shape in which the cross-sectional shape is a polygon such as a square or hexagon, or a shape in which the cross-sectional shape is different from a circle or polygon.

[0058] Furthermore, although the first divided core 3A and the second divided core 3B in the above embodiment are configured to have the same shape, the first divided core 3A and the second divided core 3B may have different shapes. For example, the magnetic core may be configured to be a rectangular tube with a cross-sectional shape perpendicular to the axial direction that is approximately square. In this case, three sides of the approximately square may be formed by the first divided core, and one side of the approximately square may be formed by the second divided core.

[0059] Furthermore, in the above embodiment, an example was shown in which the mounting location of the first case component 7A is configured to function as a ground section 99. However, the mounting location of the first case component 7A and the ground section 99 may exist separately. For example, in the above embodiment, the two fixing parts 13 are shaped assuming that the mounting location is at the bottom of the noise filter 1 in the figure. However, they may be shaped assuming that the mounting location is at the front or rear of the figure. In this case, a metal part (e.g., a metal bracket) that functions as a ground section 99 may be placed at the bottom of the noise filter 1 in the figure, separate from the mounting location.

[0060] Furthermore, the multiple functions realized by one component as exemplified in the above embodiment may be realized by multiple components. One function realized by one component as exemplified in the above embodiment may be realized by multiple components. Multiple functions realized by multiple components as exemplified in the above embodiment may be realized by one component. One function realized by multiple components as exemplified in the above embodiment may be realized by one component. Some of the configurations exemplified in the above embodiment may be omitted.

[0061] [Technical concepts disclosed in this specification] [Item 1] A noise filter attached to a shielded cable, A magnetic core is a cylindrical magnetic body having a first divided core and a second divided core, each composed of a magnetic material, and the first divided core and the second divided core are combined to form the magnetic core, A ground member comprising a conductive material, having a first contact portion and a second contact portion, which electrically connects the shield layer and the ground portion by the first contact portion contacting an exposed portion where the shield layer of the shield cable is exposed on the outer circumference, and the second contact portion contacting a ground portion having a ground potential, A case having a first case component and a second case component, wherein the second case component is configured to be attachable to the first case component, the first case component has the first split core and the ground member attached to it, and the second case component has the second split core attached to it, Equipped with, When the second case component is attached to the first case component with the shield cable positioned between the first case component and the second case component, the shield cable is positioned to penetrate the case, the first and second segmented cores are positioned to surround the outer circumference of the shield cable to form the magnetic core, and the ground member is configured to contact the exposed portion at the first contact portion. The second case component is provided with a pressing portion that, when the second case component is attached to the first case component, contacts the shield cable and presses the shield cable toward the gland portion, and when the shield cable is pressed by the pressing portion, the shield cable presses the gland member toward the gland portion, thereby increasing the contact pressure between the second contact portion and the gland portion compared to when the pressing portion is not provided. Noise filter.

[0062] [Item 2] The noise filter described in item 1, The first contact portion is composed of an elastic clamping piece that elastically deforms upon contact with the exposed portion and clamps the exposed portion with the elastic force generated by that elastic deformation. Noise filter.

[0063] [Item 3] A noise filter as described in item 1 or item 2, The second contact portion is composed of an elastic pressing piece that elastically deforms upon contact with the ground portion and presses against the ground portion with the elastic force generated by that elastic deformation. Noise filter.

[0064] [Item 4] A noise filter described in any one of items 1 to 3, The magnetic core and the ground member are arranged at adjacent positions in the axial direction of the shield cable. The first case component has two through holes through which the shafts of mounting screws pass when the first case component is attached to the mounting location. The two through holes are formed in the same direction of penetration and are rotationally symmetrical, so that their positions can be swapped by rotating the case 180 degrees along a plane perpendicular to the direction of penetration. The passage through which the shield cable passes in the case is formed in a position that exhibits rotational symmetry, such that when the case is rotated 180 degrees so that the positions of the two through holes are swapped, the position of the central axis of the passage remains unchanged before and after the rotation. Noise filter.

[0065] [Item 5] The noise filter described in item 4, The case is provided with a gripping portion that, when the shield cable is placed in the position that will become the passage and the second case component is attached to the first case component, grips the shield cable from the outer circumference, thereby suppressing relative displacement of the shield cable with respect to the case. The aforementioned engagement portions are provided at positions opposite to the ground member side with respect to the magnetic core, at positions between the magnetic core and the ground member, and at positions opposite to the magnetic core side with respect to the ground member. Noise filter. [Explanation of symbols]

[0066] 1...Noise filter, 3...Magnetic core, 3A...First segmented core, 3B...Second segmented core, 5...Ground member, 5A...First contact part, 5B...Second contact part, 7...Case, 7A...First case part, 7B...Second case part, 7C...Hinge part, 11...First engaging part, 12...Second engaging part, 13...Fixing part, 15...Through hole, 21...Claw part, 23...Groove part, 25...Spring part, 27...Snap part, 29...Mounting hole, 31...Pressing part, 33...Passage, 35...Catching part.

Claims

1. A noise filter attached to a shielded cable, A magnetic core is a cylindrical magnetic body having a first divided core and a second divided core, each composed of a magnetic material, and the first divided core and the second divided core are combined to form the magnetic core, A ground member comprising a conductive material, having a first contact portion and a second contact portion, which electrically connects the shield layer and the ground portion by the first contact portion contacting an exposed portion where the shield layer of the shield cable is exposed on the outer circumference, and the second contact portion contacting a ground portion having a ground potential, A case having a first case component and a second case component, wherein the second case component is configured to be attachable to the first case component, the first case component has the first divided core and the ground member attached to it, and the second case component has the second divided core attached to it. Equipped with, When the second case component is attached to the first case component with the shield cable positioned between the first case component and the second case component, the shield cable is positioned to penetrate the case, the first and second segmented cores are positioned to surround the outer circumference of the shield cable to form the magnetic core, and the ground member is configured to contact the exposed portion at the first contact portion. The second case component is provided with a pressing portion that, when the second case component is attached to the first case component, contacts the shield cable and presses the shield cable toward the gland portion, and when the shield cable is pressed by the pressing portion, the shield cable presses the gland member toward the gland portion, thereby increasing the contact pressure between the second contact portion and the gland portion compared to when the pressing portion is not provided. The first contact portion is composed of an elastic clamping piece that elastically deforms upon contact with the exposed portion and clamps the exposed portion with the elastic force generated by that elastic deformation. Noise filter.

2. A noise filter attached to a shielded cable, A magnetic core is a cylindrical magnetic body having a first divided core and a second divided core, each composed of a magnetic material, and the first divided core and the second divided core are combined to form the magnetic core, A ground member comprising a conductive material, having a first contact portion and a second contact portion, which electrically connects the shield layer and the ground portion by the first contact portion contacting an exposed portion where the shield layer of the shield cable is exposed on the outer circumference, and the second contact portion contacting a ground portion having a ground potential, A case having a first case component and a second case component, wherein the second case component is configured to be attachable to the first case component, the first case component has the first divided core and the ground member attached to it, and the second case component has the second divided core attached to it. Equipped with, When the second case component is attached to the first case component with the shield cable positioned between the first case component and the second case component, the shield cable is positioned to penetrate the case, the first and second segmented cores are positioned to surround the outer circumference of the shield cable to form the magnetic core, and the ground member is configured to contact the exposed portion at the first contact portion. The second case component is provided with a pressing portion that, when the second case component is attached to the first case component, contacts the shield cable and presses the shield cable toward the gland portion, and when the shield cable is pressed by the pressing portion, the shield cable presses the gland member toward the gland portion, thereby increasing the contact pressure between the second contact portion and the gland portion compared to when the pressing portion is not provided. The second contact portion is composed of an elastic pressing piece that elastically deforms upon contact with the ground portion and presses the ground portion with the elastic force generated by that elastic deformation. Noise filter.

3. A noise filter attached to a shielded cable, A magnetic core is a cylindrical magnetic body having a first divided core and a second divided core, each composed of a magnetic material, and the first divided core and the second divided core are combined to form the magnetic core, A ground member comprising a conductive material, having a first contact portion and a second contact portion, which electrically connects the shield layer and the ground portion by the first contact portion contacting an exposed portion where the shield layer of the shield cable is exposed on the outer circumference, and the second contact portion contacting a ground portion having a ground potential, A case having a first case component and a second case component, wherein the second case component is configured to be attachable to the first case component, the first case component has the first divided core and the ground member attached to it, and the second case component has the second divided core attached to it. Equipped with, When the second case component is attached to the first case component with the shield cable positioned between the first case component and the second case component, the shield cable is positioned to penetrate the case, the first and second segmented cores are positioned to surround the outer circumference of the shield cable to form the magnetic core, and the ground member is configured to contact the exposed portion at the first contact portion. The second case component is provided with a pressing portion that, when the second case component is attached to the first case component, contacts the shield cable and presses the shield cable toward the gland portion, and when the shield cable is pressed by the pressing portion, the shield cable presses the gland member toward the gland portion, thereby increasing the contact pressure between the second contact portion and the gland portion compared to when the pressing portion is not provided. The magnetic core and the ground member are arranged at adjacent positions in the axial direction of the shield cable. The first case component has two through holes through which the shafts of mounting screws pass when the first case component is attached to the mounting location. The two through holes are formed in the same direction and are rotationally symmetrical, so that their positions can be swapped by rotating the case 180 degrees along a plane perpendicular to the direction of penetration. The passage through which the shield cable passes in the case is formed in a position that exhibits rotational symmetry, such that when the case is rotated 180 degrees so that the positions of the two through holes are swapped, the position of the central axis of the passage does not change before and after the rotation. Noise filter.

4. A noise filter according to claim 3, The case is provided with a gripping portion that, when the shield cable is placed in the position that will become the passage and the second case component is attached to the first case component, grips the shield cable from the outer circumference, thereby suppressing relative displacement of the shield cable with respect to the case. The aforementioned engagement portions are provided at positions opposite to the ground member side with respect to the magnetic core, at positions between the magnetic core and the ground member, and at positions opposite to the magnetic core side with respect to the ground member. Noise filter.

5. A noise filter according to any one of claims 2 to 4, The first contact portion is composed of an elastic clamping piece that elastically deforms upon contact with the exposed portion and clamps the exposed portion with the elastic force generated by that elastic deformation. Noise filter.

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