JP2008192666A - Noise absorber - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a noise absorber with a freely removable cable fastening device in which displacement of a split magnetic core being fixed to the cable of an electronic apparatus can be prevented. <P>SOLUTION: The displacement is prevented by a noise absorber that includes a pair of split magnetic cores 13 obtained by splitting a tubular magnetic core for passing an electric cable by a plane including the axis of the tubular magnetic core, a pair of substantially semi-tubular split body case 15 containing the split magnetic cores 13, respectively, a brush 5 provided on the inner surface of a substantially semi-tubular resin sheet 3 following the curve of the split magnetic cores 13 while directing toward the center of the tube and inclining therefrom, and a cable fastening device 1 having a portion engaging with the split magnetic core 13 and/or the split body case 15. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a fixing device that assists in fixing a cable to a divided magnetic core used for suppressing electromagnetic noise that is attached to a cable of a harness or an electronic device and propagates through the cable, and a noise absorbing device using the same. is there.

  A noise absorption effect can be obtained by attaching a pair of divided magnetic cores corresponding to the cable diameter so as to be sandwiched between the cables such as a harness and an electronic device in which noise propagation is a concern.

  As a method of attaching the split magnetic core, a method of simply passing a cable through a pair of split magnetic cores (for example, Patent Document 1), or a method of fixing a cable through portion by filling it with a gel resin. (For example, Patent Document 2).

JP-A-7-122433 JP 2005-11961 A

  However, in cases such as when the cable is only passed through the split magnetic core, the position of the split magnetic core attached to the cable will shift when exposed to vibration, which may interfere with the noise absorber. Depending on the situation, there is a concern that the noise absorption effect may decrease. In order to prevent this position shift, fixing by taping or a post-processing method of fixing the position by covering the tube has been considered, but it takes time and effort, which has been a factor in increasing costs.

  In addition, as mentioned above, the cable penetration part is filled with gel-like resin and measures against positional deviation due to vibration are taken, but when the cable diameter is thick or the cable penetration part is passed through the cable penetration part several times In some cases, there is a case where a gap is generated between the divided magnetic cores due to the compression by the gel-like resin, or a case where the fitting cannot be performed, and the noise absorbing effect may not be exhibited.

  The present invention has been made in view of such problems, and a fixing device provided with a brush that is inclined in the cylinder central axis direction and in the cylinder central part direction on a resin sheet along the curvature of the divided magnetic core. It is an object of the present invention to provide a noise absorbing device provided with a cable fixing device that can prevent the position of the divided magnetic core from being displaced and can be freely removed.

  According to a first aspect of the present invention, there is provided a pair of divided magnetic cores obtained by dividing a cylindrical magnetic core through which an electric cable passes through a plane including an axis of the cylindrical magnetic core, and the divided magnetic body A cable fixing device for use in a noise absorbing device comprising a pair of substantially semi-cylindrical divided case cases each containing a core, wherein the center of the cylinder is formed on the inner surface of the substantially semi-cylindrical resin sheet along the curvature of the divided magnetic core. The cable fixing device is characterized in that a brush that is inclined toward the center of the tube and inclined from the center of the cylinder is provided, and has a split magnetic core and / or an engaging portion to the split case.

  According to a second aspect of the present invention, there is provided a pair of divided magnetic cores obtained by dividing a cylindrical magnetic core through which an electric cable passes through a plane including an axis of the cylindrical magnetic core, and the divided magnetic core And a cable fixing device according to claim 1 provided inside the split magnetic core.

  By mounting the cable fixing device according to the present invention, it is possible to fix the cable by friction between the cable covering and the brush, and to prevent the positional deviation of the divided magnetic core. Moreover, since it is not the mounting | wearing using adhesive force, removal is easy. It is possible to attach a cable fixing device of any shape depending on the shape of the cable, and because the cable fixing device can be attached simply by inserting the insertion part into the gap between the divided magnetic core and the divided case. It can be easily attached to existing harnesses and cable products of electronic devices.

  DESCRIPTION OF EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is an explanatory diagram of a cable fixing device according to the first embodiment of the present invention, and FIG. 2 is a longitudinal sectional view (AA sectional view) of the cable fixing device of FIG. FIG. 2 is a side view of the cable fixing device of FIG. 1.

  As will be described in detail later, the cable fixing device 1 according to the present invention includes a pair of divided magnetic bodies obtained by dividing a cylindrical magnetic core through which an electric cable passes through a plane including the axis of the cylindrical magnetic core. The present invention is used for a noise absorbing device comprising a core and a pair of substantially semi-cylindrical divided case housing the divided magnetic cores. The magnetic body core is not particularly limited as long as it has a cylindrical shape that forms a closed magnetic path for noise absorption characteristics. Hereinafter, a cylinder will be described as a representative.

  As shown in FIG. 1, the cable fixing device 1 is provided with a brush 5 provided on the inner surface of a semi-cylindrical resin sheet 3 so as to be inclined in the direction of the center axis of the cylinder and in the direction of the center of the cylinder. Specifically, as shown in FIG. 2, the brush 5 changes its inclination direction with respect to the center of the cylinder, is inclined toward the center of the cylinder, and is provided in the direction of the center axis of the cylinder as shown in FIG. In addition, the inclination | tilt angle of the cylindrical center part direction of FIG. 2 can be changed arbitrarily.

  Further, as shown in FIG. 3, the brush 5 is provided so that a constant gap 9 is formed in the cylindrical shaft portion. The gap 9 is provided within a range in which a cable to be fixed (illustrated later) can penetrate and the cable and the brush 5 are in contact with each other with an appropriate frictional force. In addition, what is necessary is just to set the length of the brush 5 arbitrarily according to the diameter dimension of the cable to fix. Further, the density of the brushes 5 may be set arbitrarily. The material of the brush 5 is preferably a thermoplastic resin, and the selection thereof is arbitrarily set according to the elasticity and the frictional force with the cable.

  Moreover, as an example of the engaging part to the split magnetic core and / or the split case of the cable fixing device, the split magnetic core and the split body shown later are provided at both ends of the resin sheet 3 of the cable fixing device 1. An insertion portion 7 is provided in the gap with the case for insertion.

  Next, a noise absorbing device equipped with the cable fixing device 1 will be described.

  FIG. 4 is a mounting explanatory view of the cable fixing device 1 when the noise absorbing device 11 is assembled. As shown in FIG. 4, a pair of divided magnetic cores 13 obtained by dividing a cylindrical magnetic core by a plane including the cylindrical axis of the cylindrical magnetic core is formed into a pair of substantially semi-cylindrical divided cases 15. Store each one. The cable fixing device 1 is attached to the inside of the divided magnetic core 13 by inserting the insertion portion 7 into the gap between the divided case 15 and the divided magnetic core 13.

  Although a pair of division body case 15 is not specifically limited, For example, it connects integrally with the hinge part 17 so that bending is possible, and the latching | locking part 19 is provided in a side surface. When the cable is inserted through the noise absorbing device 11, the cable is sandwiched in the gap 9 of the cable fixing device 1, and the divided body case 15 is closed and fixed.

  FIG. 5 is a longitudinal cross-sectional view of a surface including the cylindrical shaft of the noise absorbing device 11 after fitting when the cable is passed through. As shown in FIG. 5, the brush 5 presses the cable 21, and the brush 5 is inclined in the direction of the center of the cylinder, so that a force is applied to fix against the vibration of the penetration direction axis. FIG. 6 is a side view of the noise absorbing device 11 after fitting when the cable is passed through. As shown in FIG. 6, the brush 5 presses and fixes the cable 21 evenly.

  As described above, according to the first embodiment, the cable can be fixed by friction between the cable film and the brush, and the positional deviation of the divided magnetic core can be prevented. In addition, since it is not attached using adhesive force, it is easy to remove, and the cable fixing device 1 can be attached simply by inserting the insertion portion 7 into the gap between the divided magnetic body core 13 and the divided body case 15. It can be easily attached to existing harnesses and cable products of electronic devices.

  The technical scope of the present invention is not limited to the above-described embodiments, and various modifications and variations of the embodiments are also included in the technical scope of the present invention. FIG. 7 is a longitudinal sectional view of a cable fixing device according to another embodiment. For example, as shown in FIG. 7, the same effect is exhibited even when the inclination of the brush 5 is inclined toward the end with the center of the cylinder as a boundary.

The perspective view of the cable fixing tool which concerns on the 1st Embodiment of this invention. The longitudinal cross-sectional view (AA sectional drawing) of the cable fixing instrument of FIG. The side view of the cable fixing device of FIG. Installation explanatory drawing of the cable fixing device at the time of assembling the noise absorbing device. The longitudinal cross-sectional view of the noise absorption apparatus after a fitting when a cable is penetrated. The side view of the noise absorption apparatus after a fitting when a cable is penetrated. The longitudinal cross-sectional view of the cable fixing tool which concerns on other embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cable fixing tool 3 Resin sheet 5 Brush 7 Insertion part 9 Gap 11 Noise absorber 13 Division | segmentation magnetic body core 15 Division | segmentation case 17 Hinge part 19 Locking part 21 Cable

Claims (2)

  A pair of split magnetic cores obtained by splitting a cylindrical magnetic core through which an electric cable passes through a plane including the axis of the cylindrical magnetic core, and a substantially semi-cylindrical shape that accommodates the split magnetic core, respectively. A cable fixing device for use in a noise absorbing device comprising a pair of divided body cases, wherein the inner surface of the substantially semi-cylindrical resin sheet along the curvature of the divided magnetic core faces the center of the tube and borders the center of the tube A cable fixing device comprising a brush that is inclined at the top and having an engaging portion for the split magnetic core and / or the split case.   A pair of split magnetic cores obtained by splitting a cylindrical magnetic core through which an electric cable passes through a plane including the axis of the cylindrical magnetic core, and a substantially semi-cylindrical shape that accommodates the split magnetic core, respectively. A noise absorbing device comprising the pair of divided body cases and the cable fixing device according to claim 1 provided inside the divided magnetic core.

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