JPH0593013U - Electromagnetic noise prevention structure - Google Patents

Abstract

(57) [Abstract] [Purpose] To attach a tubular core that has been divided into two parts to the cable, and to fix it to the cable without using a spring holder.
(EN) An electromagnetic noise preventing structure that facilitates reliable holding of a divided tubular core and fixing to another object. [Structure] The two-divided core 7 is housed in an elastic resin holder 9 provided with a core housing recess 11 that can be opened and closed in a hinge shape by a central connecting piece 12, and both of the holder cases 13 of the resin holder 9 are housed. Bending that is fitted on both sides of one holder case by fitting the holding portion concave portion 8 attached to the outer side surface and the holding portion convex portion 81 having the holding portion parallel bars 10 on both sides attached to the other outer surface. It is fixed to another by the core body fixing portion 6.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a structure for preventing electromagnetic noise, in which a tubular core for preventing induced noise is attached and held on a cable.

[0002]

[Prior Art]

 Electromagnetic induction noise, which is induced from ambient noise radio waves, is generated in the signal cable that transmits the electric signal, and it is superimposed on the signal of the digital circuit to become an erroneous signal, or it is generated from the device that is the source of the signal line. Noise may flow into the signal line, causing the phenomenon of radio waves being dissipated into the air, causing malfunctions 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 at the time of 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 in which a tubular core divided into two parts for noise prevention is attached to a cable is a spring holder 2 in which a tip is bent inward in a U-shape made of stainless steel as shown in FIG. 1 (b). 1) As shown in Fig. 1 (a), wrap the cable 3 in the core 1 divided into two with a vertical groove to store the cable in the center, and hold the core by stopping the outer circumference of the core with the spring holder 2 However, it was difficult to fix the core to the cable and to fix the fixed core to another with the structure of the spring material holder. Further, since the core itself is exposed, there is a problem that the core is damaged during use.

[0004]

[Problems to be solved by the device]

 The present invention improves the above drawbacks and facilitates the joining of the cores when the two-divided cores are fixed to the cable, and also fixes the core and the cable and the holder itself that wraps the core to another. (EN) Provided is an electromagnetic noise preventing structure having a tubular core which is divided into two and has a groove for passing a cable inside, in which the portion holding the core is not easily removed. ..

[0005]

[Means for Solving the Problems]

 In order to attach the divided tubular core to the cable, it is necessary to fix the tubular core divided into two to the cable, but in the conventional spring material holder, it is divided into two. Although it is possible to join the cores, the structure for fixing the cores to the cable and the structure for fixing the cores fixed to the cable to other objects are not considered. Further, in the spring material holder, if the structure that satisfies the joining of the core and the fixing of the cable is satisfied, the structure becomes very complicated. Therefore, in the present invention, the material of the holder is made of elastic resin, and the core and the cable are It can be fixed to other things, and the holder itself can be fixed to other things, and the clad part of the core has a structure that does not easily come off. The present invention is characterized in that it provides a structure for preventing electromagnetic noise, which is also configured to be fixed.

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 so as to be openable and closable in a hinge shape. An elastic resin holder consisting of two holder cases with a core accommodating recess for accommodating the core. The core is accommodated in the core accommodating recess, the cable is accommodated in the central groove, and the opened resin holder is closed and fixed. The structure for preventing electromagnetic noise is characterized in that a mounting hole is provided in the center of one side of one holder case, and a bending core main body fixing part that can be bent to the same surface as the bottom surface of the holder case is attached to the mounting surface. It is a structure for preventing electromagnetic noise.

[0007]

【Example】

 An embodiment 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, which holds a core 7 and a core 7 which are divided into two parts, holds them in a cable, and fixes them to another object. A resin holder configured to do so is shown. The core 7 shown in FIG. 2 shows one shape of a tubular core which is divided into two, and two cores 7 having the shape of FIG. 2 are used as a set (the other one is not shown). Along with the other one, the central groove 72 is housed in the core housing recess 11 of the resin holder 9 with the central groove 72 facing upward, the signal wire cable is housed in the central groove 72, and the two cores 7 hold the signal wire. .. As a core used for preventing electromagnetic noise, a ferrite core having a high effective magnetic permeability is usually used, and a soft magnetic Ni—Zn system or Mn—Zn system 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 nylon-containing rubber resin or a soft polypropylene resin is used. is there. 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 both ends of the central lower portion of the resin holder 9 through which the cable of the core accommodating recess 11 is inserted. When the core 7 is housed in the core accommodating recess 11, the core disengagement preventing claws 5 are provided so as to face the core accommodating recess side and engage with the engaging grooves 71 on both sides of the core 7. The structure is such that the core is locked to the claw 5, and the core 7 is prevented from falling out of the resin holder when the resin holder is opened like a spread and removed from the cable.

The two cores are provided in two core accommodating recesses 11 provided in a holder case 13 that is integrally connected by a connecting piece 12 of a resin holder 9 that opens and closes in a hinge shape with the connecting piece 12 in the center. 7, the locking grooves 71 at both ends of the core 7 are locked to the core fall-out preventing claws 5 to fix the core 7 in the core storage recess 11, and the cable is stored in the central groove 72 of the core 7 and opened. The resin holder 9 shown in the figure 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 Fix the resin holder to the cable by firmly contacting the cable fixing claw with. When the opened resin holder is closed, the resin holder 9 is a holding portion concave portion 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. 8 and the holding portion convex portion 81 on the side surface of the other holder case are fitted and fixed. At this time, the inside diameter of the holding portion concave portion 8 and the outside diameter dimension of the holding portion convex portion are set to fit perfectly, and the tip portion of the holding portion convex 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. The holding portion parallel bars 10 are attached to both sides of the holding portion convex portion 81 with height and width dimensions at least as much as the thickness of the holding portion 18, and the holding portion 8 is attached to both sides of the holding portion convex portion. Since the hugging portion parallel bar 10 is attached while being guided and fitted, it becomes easy to fit the hugging portion concave portion and the hugging portion convex portion, and the holding portion convex portion 81 and the holding portion concave portion are held in parallel. Since the holding portion convex portion 81 and the holding portion concave portion 8 are fitted once, the fitting will not be disengaged unless the holding portion 18 is manually opened outward.

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, that is, on the same surface as the bottom surface of the holder case 13, the tip is developed from a resin holder with one end and installed horizontally on the mounting surface. It is fixed to another surface or another object by the mounting hole 61 provided.

[0011]

[Effect of the device]

 As described above, the structure for preventing electromagnetic noise according to the present invention is used to hold the resin holder in the holder case that contains the core around the cable while holding the holder case on the outer surface of one of the holder cases. A holding portion provided with a partial concave portion and a holding portion convex portion that fits into the holding portion concave portion are provided on the outer surface of the other holder case, and the holding portion is guided to both sides of the holding portion convex portion. The holding part is a structure with parallel bars attached. It is a resin holder that stores the core and opens and closes into two hinges with a connecting piece, so it is easy to join the two-divided core and fix it to the cable. The effect of being able to easily attach and detach the two-part tubular core to and from the resin holder, and also to fix the resin holder itself to other objects, and the two-part tubular core being made of resin. As it is wrapped in a holder, it has the effect of preventing chipping of the core. To.

[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 formed by splitting a two-divided core having a central groove through which a cable is inserted in the center thereof into a hinge so as to be integrally opened and closed by a central connecting piece, and accommodating the core on both sides of the connecting piece. Electromagnetic noise formed by accommodating a core in the core accommodating recess of a resin holder having elasticity and consisting of 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 in the center, and a mounting part for fixing a bent core body that can be bent in the same plane as the bottom surface of the holder case. Structure.