JPH0751772Y2 - 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 an electromagnetic noise preventing structure in which a tubular core for preventing inductive 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. Usually, in order to prevent these electromagnetic noises, a filter circuit is built in so that electromagnetic noise does not flow out from the circuit board to the signal line during device manufacturing, and there is no malfunction in the device due to induction to the signal line 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 parts, and the part that holds the core does not easily come off. Electromagnetic noise prevention with a two-part cylindrical core with a groove for passing the cable inside To provide the structure for.

[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, it is possible to join the two divided cores, but no consideration is given to the structure for fixing the core to the cable and the structure for fixing the core fixed to the cable to another object. For spring material holders,
When the structure that satisfies the joining of the core and the fixing of the cable is a very complicated structure, the holder material is made of elastic resin in the present invention, and it is possible to fix the core and the cable. The holder itself can be fixed to other objects, and the holding part of the core does not easily come off. 2
A feature is to provide an electromagnetic noise preventing structure having a structure in which a divided tubular core is held inside and can be fixed to another.

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 with a central connecting piece to be opened and closed like a hinge, and the core is provided on both sides of the connecting piece. Of the resin holder having elasticity and made of two holder cases each having a core storing recess for storing the core, the core is stored in the core storing recess, the cable is stored in the central groove, and the opened resin holder is closed and fixed. In the structure for preventing electromagnetic noise described above, one of the holder cases has a mounting hole at the center, and a bending core main body fixing portion that can be bent in the same plane as the bottom surface of the holder case is attached to the mounting surface. It is a structure for noise prevention.

[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. 2 shows one of the shapes of the tubular core divided into two, and the core 7 having the shape of FIG. 2 is used as a set (the other one is not shown) and is illustrated. The central groove 72 is accommodated in the core accommodating recess 11 of the resin holder 9 with the central groove 72 upward, and the cable of the signal line is accommodated in the central groove 72, and the two cores 7 hold the signal line. The core used to prevent electromagnetic noise is usually a ferrite core with a high effective permeability, and a soft magnetic Ni-
Zn-based or Mn-Zn-based ferrite is used.

The resin holder 9 holds the core 7 and is made of a flexible and soft resin. In the present invention, a soft resin containing nylon rubber or a soft polypropylene resin is used. . In the present invention, locking grooves 71 are provided at both ends of the bottom of both end surfaces of the central groove 72 of the core 7, and the core storage recesses 11 of the resin holder 9 are inserted into the core storage recesses 11 at both ends of the center lower portion. When the core 7 is housed in the core accommodating recess 11 when the core 7 is housed in the core accommodating recess 11, the core is prevented from slipping toward the recess side. To prevent the core 7 from falling out of the resin holder when the resin holder is opened like a spread and removed from the cable.

Two core storage recesses 11 provided in a holder case 13 integrally connected with two cores 7 by a connecting piece 12 of a resin holder 9 which opens and closes in a hinge shape with the connecting piece 12 at the center.
Respectively, the cores 7 are housed therein, and the engaging grooves 71 at both ends of the core 7 are engaged with the core fall-out preventing claws 5 to insert the cores 7 into the core accommodating recesses 1.
1, 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 holders are closed, cable fixing claws 4 are provided at both ends of the resin holder 9, and the cable surface is provided. The cable fixing claw is firmly attached to and the resin holder is fixed to the cable. Further, the resin holder 9 has a holding portion recessed portion 8 of the spring holding portion 18 attached to both ends of the outer side surface of one opened holder case 13 of the resin holder when the opened resin holder is closed. And the holding portion convex portion 81 on the side surface of the other holder case are fitted and fixed. At this time, the inner diameter of the embracing portion concave portion 8 and the outer diameter of the embracing portion protruding portion are set to fit perfectly, and the tip end dimension of the embracing portion protruding portion is slightly larger, The tip is largely tapered, while the holding portion recess 8 is a tapered hole that widens on the core storage recess 11 side. On both sides of the embracing part convex portion 81, the embracing part parallel bars 10 are attached with a height and a width dimension of at least the thickness of the embracing part 18.
Since the holding portion 8 is attached while being guided by the holding portion parallel bars 10 attached to both sides of the holding portion convex portion, the holding portion concave portion and the holding portion convex portion can be easily fitted, and the holding portion convex portion Part 81
Since the holding portion concave portion and the holding portion concave portion are held parallel to each other and fitted, unless the holding portion convex portion 81 and the holding portion concave portion 8 are fitted once, the holding portion 18 is fitted outward unless the holding portion 18 is manually opened. If it does, it will not fall off.

When the resin holder attached to the cable is fixed to another surface or another object, one holder case 1
The two bent core main body fixing portions 6 attached to both sides of 3 are attached to the attaching surface of the resin holder, that is, the holder case 13
The mounting hole 61 is provided in the center of the bent core main body fixing portion 6 by unfolding the tip from a resin holder having one end and horizontally installing it on the mounting surface so as to be flush with the bottom surface of
To fix it to another surface or other object.

[0011]

As described above, in the structure for preventing electromagnetic noise according to the present invention, the holder case containing the core in the resin holder is fitted in and fixed to the center of the cable in one holder case. A holding portion having a holding portion concave portion on the outer side surface, a holding portion convex portion which fits the holding portion concave portion on the other holder case outer surface, and holding portions on both sides of the holding portion convex portion It is a structure in which a holding part parallel bar that guides the part is attached,
Since it is a resin holder that stores the core and opens and closes into two hinges with a connecting piece, it is easy to join the two-divided core and fix it to the cable. The effect that the resin holder can be easily attached and detached, and that the resin holder itself can be easily fixed to other objects, and that the two-divided cylindrical core is wrapped with the resin holder so that the core can be prevented from chipping. Have and.

[Brief description of drawings]

FIG. 1 is a schematic view showing an example of a conventional technique, FIG. 1 (a) is an external perspective view in which a core is fixed to a cable by a cable, a core and a spring material holder, and FIG. 1 (b) is a spring material. The front view of a 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 which is integrally formed by connecting a central connecting piece with a central groove provided with a central groove for inserting a cable in the center so as to be openable and closable in a hinge shape, and accommodates the core on both sides of the connecting piece. Electromagnetic noise produced by accommodating a core in the core accommodating recess of a resin holder having elasticity and comprising two holder cases provided with accommodating recesses, and closing and fitting and fixing a resin holder having a cable accommodated in the central groove. In the structure for prevention of electromagnetic noise, one holder case has a side mounting hole at the center, and a mounting part for the bent core body that can be bent in the same plane as the bottom surface of the holder case is attached to the mounting surface. Structure.