JP2547591Y2 - Noise filter - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to a two-part cylindrical magnetic core (hereinafter referred to as a magnetic core) and a core holder for the purpose of preventing induced electromagnetic noise attached to a signal line having a large number of conductors arranged side by side. The present invention relates to a noise filter configured in combination.

[0002]

2. Description of the Related Art FIG. 2 shows a conventional noise filter having a structure holding a magnetic core for preventing electromagnetic noise of a signal line.

In order to hold signal lines from both upper and lower surfaces, a core holder 2 made of a stainless spring material shown in FIG. 1B is used to hold two magnetic cores 1 having a concave portion in the center. Therefore, although the magnetic core bonding surface can be bonded, it is difficult to fix the magnetic core 1 to the signal line 3, the magnetic core 1 is exposed, and the magnetic core 1 is easily chipped. There are drawbacks such as requiring a separate fixing method for fixing to another.

Therefore, in the induction noise prevention device using the stainless steel fastening fitting of the conventional structure, it is necessary to widen the arm of the fitting in order to hook the claw at the tip of the fitting on the ridge of the magnetic core. There is a problem that the mounting work of the is difficult.

[0005]

The present invention relates to a two-part cylindrical magnetic core having a structure in which the core holder is made of resin, and the magnetic core and the signal line can be fixed and the holding portion is not easily detached. It is an object of the present invention to provide a noise filter having a core holder to which a filter can be attached.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a pair of two-part cylindrical magnetic cores having a concave portion for holding a signal line and a groove for fitting with a claw of a core holder. And a recess made of a resin material for accommodating a pair of two-part cylindrical magnetic cores, a claw for engaging and fixing the pair of two-part cylindrical magnetic core grooves, and an integrally formed spring for fixing a signal line. With a pair of core holders, the signal line is housed in the concave portion of the pair of two-part cylindrical magnetic cores, and the pair of two-part cylindrical magnetic cores is housed in the concave portions of the pair of core holders and provided in one of the core holders. Noise filter configured to engage and fix the holding portion concave portion provided and the holding portion convex portion provided between two parallel bars provided on both sides of the other core holder in the engaging direction. Is adopted as a means.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a configuration of a magnetic core and a core holder in an embodiment of a noise filter according to the present invention.

FIGS. 1A and 1B show a noise filter according to the present invention, which has a structure in which a two-part cylindrical magnetic core for preventing induced electromagnetic noise is housed and a signal line can be fixed. 1 shows the structure of a part. (A) shows one shape of a two-divided magnetic core. The magnetic core having the shape shown in the figure is used as a set of two, and the two magnetic cores are used to accommodate a signal line cable in a core inner cylindrical portion. Hold the signal line. As a magnetic core used for preventing electromagnetic noise, a ferrite core having a high effective magnetic permeability is used, and a Ni—Zn or Mn—Zn ferrite core is usually used. (B)
Is a core holder for holding the magnetic core of (a). In the present invention, a flexible soft resin is used.

In the present invention, a groove 8 is provided in the magnetic core 7 and the core holder 12 is provided with a magnetic core housing recess 20 inside the opening / closing structure.
When the magnetic core 7 is housed in the core holder 12, the magnetic core groove 8 is formed.
The structure is such that the claw 5 for preventing the magnetic core from falling off is applied to the magnetic core 7 to prevent the magnetic core 7 from falling off.

The magnetic core 7 is housed on both sides of the resin core holder 12, and the resin core holder 12 is closed by passing a signal line through the cylindrical portion of the magnetic core 7 on the inner diameter side of the core. The resin core holder 12 has a book-shaped structure, has a magnetic core storage recess 20 for storing the magnetic core 7 on each surface, and two signal line fixing springs 4 are provided on both sides. A structure in which the magnetic core 7 is housed, the signal line is passed through the center, and when the core holder 12 is closed, the signal line is pressed by each signal line fixing spring 4 of the core holder 12 to fix the core holder 12 to the signal line. It is. At this time, the signal line fixing spring 4
Is made of resin, so there is no risk of damaging the fixed signal lines.

The book-shaped resin core holder 12 accommodates and closes the signal line and the two-part cylindrical magnetic core, and fits and fixes the holding portion projection 9 to the holding portion recess 10. Also core holder 1
Since the parallel bar 11 of the holding portion is provided in 2, the core holder is held by the parallel bar 11 of the holding portion in parallel with each other by fitting the holding portion convex portion 9 and the holding portion concave portion 10. It does not come off easily.

The magnetic cores are sufficiently joined by a magnetic core joining spring 13 provided on a core holder 12.

[0014]

[Effects of the Invention] The noise filter according to the present invention can easily be joined to the two-part cylindrical magnetic core by the resin core holder and fixed to the signal line, can be manufactured easily, has a small number of parts, Also, it becomes compact. Subsequently, since the signal wire fixing spring integrally formed with the core holder of the present invention has elasticity, the spring is deformed, and the elasticity allows the core holder to be securely clamped to the outer peripheral portion of the signal line. At this time, the outer peripheral portion of the signal line is not damaged. Further, in the core holder of the present invention, since the two parallel bars are guided on both sides of the holding portion concave portion in parallel with the engaging direction, the core holder is smoothly and securely engaged and fixed.
Furthermore, the core holder of the present invention prevents slippage after engagement and fixation, and does not easily come off even when an external force is applied.Moreover, since the core holder has a shape enclosing the magnetic core, the core holder can prevent chipping of the magnetic core. It also plays a role.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an embodiment of a noise filter according to the present invention. (A) is a figure of one magnetic core of the division | segmentation cylindrical magnetic core of this invention. (B) is a figure which shows the shape of a core holder.

FIG. 2 is a schematic diagram showing an embodiment of a conventional noise filter.
(A) The structure of a conventional noise filter. (B) Stainless steel core holder.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 magnetic core 2 core holder 3 signal line 4 signal line fixing spring 5 magnetic core falling-off preventing claw 7 magnetic core 8 groove 9 holding portion convex portion 10 holding portion concave portion 11 parallel bar of holding portion 12 core holder 13 magnetic core Joining spring 20 Magnetic core storage recess

Claims (1)

(57) [Scope of request for utility model registration] 1. A pair of two-part cylindrical magnetic cores provided with a recess for holding a signal line and a groove for fitting with a claw of a core holder, and a pair of two-part cylindrical magnetic cores made of a resin material. The signal line is divided into a pair of two-part cylinders by a concave part for accommodating a pair of two-part cylindrical magnetic cores, and a pair of claws for engaging and fixing the grooves in the pair of two-part cylindrical magnetic cores, and a pair of core holders having integrally formed springs for fixing the signal lines. And a pair of two-part cylindrical magnetic cores are housed in the recesses of the pair of core holders, and the holding portion recesses provided in one of the core holders are engaged with the other core holder. A noise filter characterized in that it is configured to engage and fix a holding portion protrusion provided between two parallel bars disposed on both sides in the direction.