JPH085532Y2 - Signal line electromagnetic noise suppressor - Google Patents

Description

[Detailed Description of Device] a. OBJECT OF THE INVENTION [Industrial application] The present invention relates to a signal line electromagnetic noise suppressor using a split type tubular core.

[Conventional technology]

As a means to prevent electromagnetic noise that radiates from the signal lines (insulation-coated wires, cables, flat cables, etc.) that connect electronic devices to each other or that enters the signal lines,
There is a method of penetrating the signal line through a ferrite core having a high magnetic permeability. In the case of the arranged signal line, it is difficult to penetrate the tubular core through the signal line. Therefore, a signal line using a split type tubular core obtained by cutting the tubular core into two equal parts parallel to the axial direction. An electromagnetic noise suppressor was applied.

As shown in FIG. 3, in the case of a split-type cylindrical core consisting of two half-cylindrical core pieces 1, the strip-shaped core holder 3 is put on the cylindrical core that abuts the signal line 2 through the central hole. It was fixed with screws 4 at a predetermined location on the device.

The core holder 3 is formed by forming a long thin plate of a flexible insulating resin material having a width dimension equal to the axial length of the core piece 1 into a shape in which the middle portion thereof substantially conforms to the outer circumference of the cylindrical core. The mounting hole 5 is formed in the flat plate portion of the. Since the abutting surfaces of the core piece 1 and the core holder 3 are smooth and there is a concern that they may be displaced from each other, the core piece 1 was bonded to the core holder 3 with a double-sided adhesive tape (or adhesive) 6.

[Problems to be solved by the device]

In the case of the above-mentioned signal line electromagnetic noise prevention device, when the core holder 3 is simply put on the cylindrical core, as shown in FIG. It can be fixed by a screw (not shown) by inserting a cylindrical bush as shown by the chain line. However, since the elastic force of the core holder 3 is small and the two core pieces 1 cannot be strongly butted and held in a cylindrical shape, a deviation may occur at the butted surfaces of the core pieces 1. Therefore, as schematically shown in FIG. 3, the flat pieces on both ends of the core holder 3 are brought close to each other by the screw 4 to strongly bind the core pieces 1 to each other. In this state, the orientations of the joint surfaces of the core pieces 1 are adjusted in advance so that the outer surfaces of the two core pieces 1 are adhered to the core holder 3 with substantially the same length. 3 had to be glued. As described above, the conventional device has a problem that the cost of the adhesive material and a large amount of installation work cost are required.

The present invention is intended to solve the above-mentioned drawbacks, to provide a stable signal line electromagnetic noise prevention device which does not require an adhesive material cost or the like, is easy to install, and has a core that is not displaced.

B. Configuration of the Invention [Means for Solving the Problems] The present invention has two flat core pieces that are cut in half in parallel to the axial direction. A split type cylindrical core in which grooves each having a portion are formed parallel to the axial direction, and an insulating resin material rich in elasticity,
It has a U-shape with a space on the free end side, and the free end edge of the lower arm extends outward to form a mounting hole in the extension, and the groove of the core piece is formed on the inner surface of the upper and lower arms. It is characterized by using a core holder provided with engaging ridges for fitting with each other.

That is, a split-type tubular core that is cut in half in parallel with the axial direction, and has a flat outer surface that is parallel to the cut surface and that has a groove with an enlarged portion in the middle and that is parallel to the axial direction. It is made of an insulating resin material with high elasticity, and it is U-shaped and the distance between the free ends of the upper and lower arms is narrower than that of the base side, and the free ends of the lower arms are extended outward to form mounting holes. A core holder provided with engaging ridges that are respectively formed on the inner surfaces of the upper and lower arm portions and that fit into the groove having the swelled portion in the middle, and the tubular core is passed through the signal line. Thus, there is provided a signal line electromagnetic noise prevention device in which the engaging projection of the core holder is fitted and combined with a groove having an enlarged portion at the center of the split type tubular core.

[Action]

The upper and lower arms of the core holder hold the split tubular core. Engagement ridges on the upper and lower arms engage with a groove having an enlarged portion in the middle of the outer surface of the core piece to prevent axial displacement of the tubular core by the enlarged portion and diametrical displacement by the groove portion. Furthermore, the displacement of the core pieces is prevented by the elastic force of the holder.

〔Example〕

FIG. 1 is an external perspective view of an embodiment of the present invention, and FIG. 2 is an exploded explanatory view for explaining its assembly.

In FIG. 1, 2 (indicated by a chain line) is a signal line, 5 is a mounting hole, 7 is a core piece that is abutted with two pieces to form a split type cylindrical core, 10 is a core holder, and 15 is an engaging protrusion. Article.

The core piece 7 is a ferrite core of a shape in which the outer shell of the semi-cylindrical body is cut in a width dimension slightly larger than the diameter of the central hole in parallel with the cut surface (butting surface), Grooves 8 having a circular enlarged portion 9 in the middle (the central portion in the drawing) are formed at two locations on the substantially corresponding flat outer surface in parallel with the axial direction. (See FIG. 2) The core holder 10 is made of highly elastic insulating resin, and has a base portion 11,
It is composed of an upper arm portion 12 and a lower arm portion 13, and its width dimension is almost the same as the axial length of the core piece 7. Base 11 is upper arm 1
2. It is thicker than the lower arm portion 13 and curved outward in an arc shape along the height direction. The upper arm portion 12 has a length dimension sufficiently larger than the width dimension of the flat outer surface of the core piece 7, and in the free state, as shown in FIG. 2, the free end portion is inclined toward the lower arm portion 13. are doing. The lower arm portion 13 extends longer than the upper arm portion 12, and the attachment hole 5 is formed in the extension portion 14. On the inner surfaces of the upper and lower arm portions 12 and 13, two engaging protrusions 15 that fit into the grooves 8 of the core piece 7 with the two enlarged portions 9 are provided so as to face each other. There is.

Because of the core piece 7 and the core holder 10 having such a structure, for example, as shown by the chain line in FIG. The groove 8 with the portion 9 is fitted and placed, and the core holder 10 is arranged at a predetermined position of the signal line through the signal line through the central hole (central groove) of the core piece 7, and only the upper arm 12 is provided. By lifting the other core piece 7 over the signal wire and the core piece 7, and fitting the engaging ridge 15 of the upper arm 12 into the groove 8 with the enlarged portion 9 thereof. The electromagnetic noise suppressor can be quickly installed on the signal line.

After arranging the two core pieces 7 as a tubular core by penetrating the signal wire, the core holder 10 is extended from the side of the core piece 7 by widening the space between the upper arm 12 and the lower arm 13. It can be installed easily even with the covering procedure.

As shown in FIG. 1, since the upper arm portion 12 and the lower arm portion 13 grip the two core pieces 7 in a substantially parallel state, the core holder 10 shown in FIG. 2 is largely restored to the free state. Force is above
The lower arm portions apply elastic force to the core piece 7, and the engagement ridge 15 and the groove 8 are fitted to each other, whereby the core piece 7 is acted upon by the action of the enlarged portion 9 located in the middle of the groove 8 in the axial direction of the core. Further, due to the action of the groove portion 8 in the radial direction, the core pieces 7 can be strongly abutted against each other without being displaced in any direction and can be maintained in a tubular shape.

Although the embodiment has shown the case where the central hole of the cylindrical core is circular, when the central hole is rectangular or cross-shaped, only one groove 8 may be provided on the outer surface.

C. Effect of the Invention [Effect of the Invention] According to the present invention, the core piece and the core retainer can be easily and properly combined and installed on the signal line without being bonded,
This has the effect of reducing the cost of adhesive materials and installation work, and since there is no misalignment of the core pieces, it has the effect of stabilizing noise prevention performance and improving reliability.

[Brief description of drawings]

FIG. 1 is an external perspective view showing an embodiment of the present invention. FIG. 2 is an exploded view for explaining the assembly of the embodiment shown in FIG.
FIG. 3 is a front view showing a mounting state of a conventional example. Fourth
The figure is a front view showing an example of another mounting state of the conventional example. 1,7 …… Core piece, 2 …… Signal line, 3,10 …… Core holder,
4 ... Screw, 5 ... Mounting hole, 6 ... Double-sided adhesive tape (adhesive), 8 ... Groove, 9 ... Enlarged portion, 11 ... Base portion, 12 ...
Upper arm part, 13 ... Lower arm part, 14 ... Extension part, 15 ... Engaging ridge.

Claims (1)

[Scope of utility model registration request] 1. A split-type tubular shape which is cut into two equal parts in parallel with the axial direction, and in which a groove having an enlarging part in the middle is formed on an outer surface parallel to the cut surface and parallel to the axial direction. It consists of a core and an insulating resin material rich in elasticity, and it is U-shaped and the distance between the free ends of the upper and lower arms is narrower than that on the base side, and the free ends of the lower arms are extended outward. A core holder provided with mounting holes, and further provided with engaging projections on the inner surfaces of the upper and lower arm portions, which engage with the groove having the enlarged portion in the middle, respectively, A signal line electromagnetic noise prevention device obtained by fitting the engaging protrusions of the core holder into a groove having an enlarged portion in the middle of the split type cylindrical core so as to penetrate therethrough and combining them.