JPH0751771Y2 - Electromagnetic noise prevention structure - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for preventing electromagnetic noise in which a tubular core for preventing induction noise is attached and held on a cable.

[0002]

2. Description of the Related Art Signal cables for transmitting electrical signals are
Electromagnetic induction noise induced from surrounding noise radio waves is generated and is superimposed on the signal of the digital circuit, resulting in an erroneous signal. The phenomenon such as radiation into the air occurs and causes malfunction of other devices. Normally, in order to prevent these electromagnetic noises, a filtering circuit is built in so that electromagnetic noise does not flow out from the circuit board to the signal lines during device manufacturing, and that malfunctions do not occur inside the device due to induction of signal lines by external radio waves. However, depending on the environmental conditions, it may be necessary to take measures against electromagnetic noise after the device is assembled.

Conventionally, a structure for attaching a two-piece cylindrical core for noise prevention to a cable uses a spring material holder 2 shown in FIG. 1B, which is made of stainless steel and has its tip bent inward. Then, as shown in FIG. 1 (a), the cable 3 is wrapped with a two-divided core 1 having a vertical groove for accommodating the cable in the center, and the outer periphery of the core is held by a spring material holder 2 to hold the core. However, it was difficult to fix the core to the cable and the structure of the spring material holder to fix the fixed core to another. Further, since the core itself is exposed, there is a problem that the core is damaged during use.

[0004]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned drawbacks and facilitates the joining of cores when two-divided cores are fixed to a cable, and also fixes the core and the cable and wraps the core. The holder itself can be fixed to other
(EN) Provided is an electromagnetic noise preventing structure having a structure in which a portion holding a core does not easily come off, and in which a tubular core divided into two having a groove for passing a cable inside is attached.

[0005]

In order to attach the divided tubular core to the cable, it is necessary to fix the tubular core divided into two parts to the cable. In the holder, although it is possible to join the two divided cores, the structure for fixing the core to the cable and the structure for fixing the electromagnetic noise preventing structure fixed to the cable to another object are considered. Not not. Also, if the structure in which the joining of the core and the fixing of the cable are satisfied by the spring material holder is very complicated, the material of the holder is made of elastic resin in the present invention, and the fixing of the core and the cable is made. In addition, the holder itself can be fixed to other things, and the holding part of the core does not easily come off, so that the divided cylindrical core can be held inside and fixed to other parts. An electromagnetic noise preventing structure having the above-mentioned structure is provided.

That is, according to the present invention, a two-divided core having a central groove for inserting a cable in the center is integrally connected by a central connecting piece to be opened and closed in a hinge shape, and the core is housed on both sides of the connecting piece. Electromagnetic noise prevention in which a core is housed in the core housing recess of a resin holder including two holder cases provided with core housing recesses, and a resin holder opened by housing a cable in the central groove is closed and fixed. In the structure, a plate-like elastic member is provided on both outer surfaces of the holder cases on both sides of the resin holder opened at the center of the connecting piece, and at least one pair of holder cases has a holding portion concave portion at the center thereof. And a holding portion convex portion that fits in the holding portion concave portion on the outer surface of the other holder case, and guides and fits the holding portion on both sides of the holding portion convex portion. Hold parallel part parallel to the length direction Be attached is an electromagnetic noise prevention structure characterized.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 shows an inductive noise preventing structure according to an embodiment of the present invention. The core 7 is divided into two and the core 7 is housed and held, fixed to a cable, or fixed to another object. The resin holder configured as described above is shown. The core 7 shown in FIG.
One of the shapes of the divided tubular cores is shown, and two cores 7 having the shape of FIG. 2 are used as a set (the other one is not shown), and the resin is used together with the other one not shown. The central groove 72 is placed in the core storage recess 11 of the holder 9
The signal line cable is housed in the central groove 72, and the two cores 7 hold the signal line. The core used for electromagnetic noise prevention is usually a ferrite core with high effective permeability, and soft magnetic Ni core.
-Zn type or Mn-Zn type ferrite is used.

The resin holder 9 holds the core 7 and uses a flexible and soft resin. In the present invention, a soft nylon rubber-containing resin or a soft polypropylene resin is used. In the present invention, the central groove 7 of the core 7
Locking grooves 71 are provided at both ends of the bottom of both end surfaces of 2, and both ends of the core storage recess 11 of the resin holder 9 are inserted into the core storage recess 11 at both lower ends of the center, so as to face the core storage recesses. Claw 5 for preventing the core from coming off to be locked in the locking groove 71
Is provided, and when the core 7 is housed in the core accommodating recess 11, the locking groove 71 provided in the core 7 is locked to the core fall-out preventing claw 5, and the locking groove 71 is a spread-like shape of the resin holder. Open when the resin holder is removed from the cable, the core 7
To prevent it from falling out of the resin holder.

The core 7 is housed in each of the two core accommodating recesses 11 provided in the holder case 13 which is integrally connected by the connecting piece 12 of the resin holder 9 which opens and closes the connecting piece 12 in the shape of a hinge. The locking grooves 71 at both ends of 7 are locked to the core falling prevention claws 5 to fix the core 7 in the core housing recess 11,
The cable is housed in the central groove 72 of the core 7, and the opened resin holder 9 is bent at the connecting piece 12 and closed to fix the cable in the central groove. The opened resin holders are integrally connected to each other by a resin connecting piece 12. When the opened resin holder is closed, cable fixing claws 4 are provided at both ends of the resin holder 9 which come into contact with the cable. ,
Fix the resin holder to the cable by firmly contacting the cable fixing claw with the cable surface. Further, the resin holder 9 has a spring-like elastic property which is attached to both ends of one outer surface of the holder case 13 which is integrally connected by the opening connecting pieces of the resin holder when the opened resin holder is closed. The holding portion concave portion 8 provided in the center of a certain plate-shaped holding portion 18 and the holding portion convex portion 81 on the outer surface of the holder case are fitted to each other, and the cable is stored and fixed in the resin holder containing the core. To do. At this time,
The inner diameter of the holding portion concave portion 8 and the outer diameter of the holding portion protruding portion are set to fit perfectly, and the tip portion of the holding portion protruding portion is slightly large, and the tip is large in the height direction. The holding portion concave portion 8 is tapered, while the core holding concave portion 1
The taper hole is wide on the 1st side. Holding part convex part 81
The holding portion parallel bars 10 are provided at least on both sides of the holding portion 18
The holding portion 18 is attached with a height corresponding to the thickness of the holding portion and a dimension that allows the width dimension. Therefore, the holding portion 18 is guided by the holding portion parallel bars 10 attached to both sides of the holding portion convex portion 81 to hold the holding portion. It becomes easy to fit the convex portion and the holding portion concave portion, and the holding portion is guided by the holding portion parallel bar 10 to fit the holding portion convex portion and the holding portion concave portion. Once the fitting portion 81 and the holding portion concave portion 8 are fitted, the fitting will not be disengaged unless the holding portion 18 is opened outward by hand.

When the resin holder attached to the cable is fixed to another surface or another object, the two bent core main body fixing portions 6 attached to both sides of one holder case 13 are fixed to the resin holder. On the mounting surface of the holder case 1
The mounting hole 6 provided at the center of the bent core main body fixing portion 6 is such that one end is unfolded from a resin holder having one end so as to be flush with the bottom surface and the tip is installed horizontally on the mounting surface.
It is fixed to another surface or another object by 1.

[0011]

As described above, the structure for electromagnetic noise prevention according to the present invention is such that the core is housed in the core housing recess of the holder case of the resin holder, the cable is housed in the central groove of the core, and the cable is fitted around the core. For holding, the holding portion is provided with a holding portion concave portion on one outer surface of the holder case, and the holding portion convex portion that fits into the holding portion concave portion is provided on the other holder case outer surface to hold the holding portion. Since the holding portion parallel bars for guiding the holding portion are attached to both sides of the partial convex portion, the resin holder that opens and closes into two hinges integrally with the connecting piece that stores the core is 2 pieces.
The split core can be easily joined and fixed to the cable, and the resin holder itself can also be fixed to another object. Therefore, the 2-split cylindrical core can be easily attached to and removed from the resin holder. In addition to the effect, the two-divided tubular core is wrapped with the resin holder so that the core can be prevented from being chipped.

[Brief description of drawings]

1 is a schematic diagram showing an example of a conventional technique, and FIG.
1A is an external perspective view in which the core is fixed to the cable by the cable, the core, and the spring material holder, and FIG. 1B is a front view of the spring material holder.

FIG. 2 is an external perspective view of an electromagnetic noise preventing structure according to the present invention.

[Explanation of symbols]

 1, 7 core 2 spring material holder 3 cable 4 cable fixing claw 5 core falling prevention claw 6 bent core main body fixing part 8 hugging part recess 9 resin holder 10 hugging part parallel bar 11 core accommodating recess 12 connecting piece 13 holder Case 18 Holding part 61 Mounting hole 71 Locking groove 72 Central groove 81 Holding part convex part

Claims (1)

[Scope of utility model registration request] 1. A core accommodating recess for accommodating a two-divided core having a central groove for inserting a cable in the center thereof, integrally formed with a central connecting piece so as to be openable and closable in a hinge shape, and accommodating the core on both sides of the connecting piece. In a structure for electromagnetic noise prevention in which a core is housed in the core housing recess of a resin holder consisting of two holder cases, and a cable holder is housed in the central groove and the opened resin holder is closed and fixed. , A plate-shaped elastic holder having a holding portion concave portion at the center on both outer side surfaces of the holder cases on both sides of the resin holder opened around the connecting piece A holding portion, a holding portion convex portion that fits into the holding portion concave portion on the outer side surface of the other holder case, and a length direction in which the holding portion is guided and fitted on both sides of the holding portion convex portion. Attach the parallel bar to the holding part parallel to A structure for preventing electromagnetic noise, which is characterized in that