JP2547595Y2 - 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 problem to be solved by the present invention is that the core holder is made of resin, and a noise having a core holder to which a two-part cylindrical magnetic core capable of securely fixing the magnetic core and the signal line can be attached. The purpose is to provide a filter.

[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. A concave portion made of a soft resin material for accommodating a pair of two-part cylindrical magnetic cores, a claw engaging with and fixing to a pair of two-part cylindrical magnetic core grooves, and integrally formed on both sides and protruding. A pair of core holders having rectangular leaf springs for fixing the signal lines, the signal lines are housed in the recesses of the pair of two-part cylindrical magnetic cores, and the pair of two-part cylindrical magnetic cores are connected to the pair of cores. A noise filter housed in a recess of the holder and configured to engage and fix the holding portion recess provided on one core holder and the holding portion protrusion provided on the other core holder as means. adopt.

[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 to be used. (A) shows one shape of a two-divided magnetic core, in which two magnetic cores having the shape shown in the figure are used as a set, and two magnetic cores are accommodated in a cylindrical portion on the inner diameter side of the core so that a signal line cable can be accommodated. To 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, the magnetic core 7 is provided with a groove 8, and the core holder 12 is made of resin having a magnetic core housing recess 20 inside the opening / closing structure. When the magnetic core 7 is accommodated in the core holder 12, the magnetic core 7 is prevented from falling off by the magnetic core falling prevention claw 5 in the groove 8 of the magnetic core.

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, and has a magnetic core 7 on each surface.
, And two signal line fixing leaf springs 4 are provided on both sides of the core holder 12.
When the core holder 12 is closed and the signal line 3 is passed through the center and the core holder 12 is closed, the signal line 3 is pressed by each signal line fixing leaf spring 4 of the core holder 12 so that the core holder 12 is It is to be fixed to the line 3. In this case, since the signal line fixing leaf spring 4 is made of resin, there is no fear of damaging the signal line 3 to be fixed.

The book-shaped resin core holder 12 accommodates and closes the signal line 3 and the two-part cylindrical magnetic core 7, and fits and fixes the holding portion convex portion 9 to the holding portion concave portion 10. The core holder 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]

The noise filter according to the present invention can easily join the two-part cylindrical magnetic core and fix it to the signal line by the resin core holder. Also, the rectangular leaf spring of the present invention has elasticity over a wide and thin entire range from the root to the tip pressed against the signal line,
The spring is deformed, and the pair of core holders can be reliably clamped to the outer peripheral portion of the signal line by its abundant elasticity. At this time, the outer peripheral portion of the signal line is not damaged. Further, the present invention prevents the pair of core holders from being displaced by fitting the holding portion convex portion and the holding portion concave portion, so that even if an external force is applied, the core holder does not easily come off and wraps the magnetic core. Since it has an elliptical shape, it also plays a role in preventing chipping of the magnetic core.

[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]

 DESCRIPTION OF SYMBOLS 1 Magnetic core 2 Core holder 3 Signal wire 4 Signal wire fixing leaf spring 5 Magnetic core falling prevention claw 7 Magnetic core 8 Groove 9 Holding part convex part 10 Holding part concave part 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 made of a soft resin material and 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. A pair of recesses for accommodating the magnetic core, claws engaging and fixing the grooves of the pair of two-part cylindrical magnetic cores, and a pair of rectangular leaf springs integrally formed on both sides and protruding to fix the signal lines. With the core holder, the signal line is accommodated in the concave portion of the pair of two-part cylindrical magnetic cores, and the pair of two-part cylindrical magnetic cores is accommodated in the concave portions of the pair of core holders. A noise filter characterized in that a holding portion concave portion and a holding portion convex portion provided on the other core holder are engaged and fixed.