JPH0453194A - Cable holder - Google Patents

Abstract

PURPOSE:To provide an EMR noise protection to a cable and to easily alter even after a device is completed by providing a holder member for holding an annular ferrite core to be inserted add held with a cable, and means for securing the member to be secured to a device body to protrude in a rod state to a cable route. CONSTITUTION:A holder member 1 is previously secured to a predetermined position to the laying route of a cable 9, and the cable 9 necessary with an EMI protection can be provided with the EMI protection through a ferrite core 3. If an alteration occurs, the core 3 can be opened. Accordingly, the cable 9 can be easily telescoped in or out, and simply separated from or bundled to the bundle of the cable 9. Further, since clamping means of a securing member 2 is provided at a predetermined interval, alteration of the position, replacement for altering characteristics, new addition of the core 3 can be facilitated. It is important to lay the cable 9 by a cable holder 7 at a position near the connecting point of the cable 9 as near as possible through the core 3.

Description

[Detailed Description of the Invention] [Summary] The purpose of this invention is to provide a cable holder that takes measures against EMI noise to the cable and that can be easily changed even after the device is completed. It is composed of a holder member that grips the ferrite core, and a fixing member that protrudes like a rod from the cable route, is fixed to the main body of the device, and is provided with means for fixing the holder member. The ferrite core divided into two parts is configured to be held openably and closably by the divided surface, and the fixing means of the holder member is configured to be fixing members provided at predetermined intervals.

[Industrial application field]

The present invention relates to a cable holder.

Recently, digital signal devices that handle pulse signals, such as computers, word processors, facsimile machines, exchanges, and digital telephones, have come into widespread use. The pulse contains high-order frequency components, and EM I (Ele
ctro Magnetic Interferer+
ce (electromagnetic interference) noise becomes a problem.

Therefore, EMI countermeasures that reduce the emission of EMI noise from the device itself and suppress the intrusion of EMI noise from the outside are becoming standardized and becoming important matters.

EMI countermeasures include covering the circuit with metal to suppress the emission and intrusion of 8Ml noise, and also taking measures to prevent EMI from being emitted and intruding through connection cables, which can have a major impact. There is a need to.

[Conventional technology]

Figure 3(a) shows the wiring state inside the device in a conventional example, and Figure 3(b)
Figure 1 shows the EMI countermeasure part.

As a conventional example, the internal wiring state of the device is for a shelf 81 mounted vertically in the device case as shown in FIG. A connector 91 that stores the boards in parallel and is arranged on the backboard 82 of the multilayer printed board on the rear side.
The printed boards are interconnected through the backboard 82, and the wiring cable 9 is connected to other parts than the shelf 81 through the terminals of the connector 91.

Only the cable 9 is pulled out from the cable storage section on the left and right sides of the device housing, guided along a rod-shaped cable holder 75 that protrudes rearward from the lower rear edge of the shelf 81, and is guided to a predetermined position. It is raised up at the position of the connector 91 and its tip is connected to the terminal, and in the middle, at the position of the cable holder 75, it is held and fixed by a nylon band 76.

To take EMI countermeasures for this cable 9, you can: 1) use a shielded cable 9 that is expensive and thick; 2) wrap a shielding tape 92 around the necessary parts of the cable as shown in FIG. ■Annular ferrite core 3 that shields 9
5 on the outside, etc., to provide attenuation to the problematic high frequency region while having almost no effect on the signal frequency band.

[Problem to be solved by the invention]

However, (1) It is difficult to analyze the effects of EMI noise at the equipment design stage; therefore, although some countermeasures are taken, the actual situation cannot be known until after the equipment is completed.

■ Moreover, if it becomes necessary to strengthen measures, EM
The cable 9, which is the radiation source or guided part of the IfH1 sound,
It becomes necessary to separate it from other cables 9 or change the wiring route.

■ Because of this separation, it becomes necessary to reassemble the bundle of cables 9.

- It is difficult to determine the position and amount of wrapping of the shielding tape 92, and the wrapping process requires many man-hours.

■ It is difficult to select the type of characteristics of the ferrite core 35, and it is also necessary to consider the method of fixing it.

There are other problems.

In view of such problems, the present invention has been developed to reduce EMI to cables.
The purpose of the present invention is to provide a cable holder that takes noise countermeasures and that can be easily changed even after the device is completed.

[Means to solve the problem]

The above purpose is as shown in FIG. This is achieved by the cable holder 7 of the present invention, which comprises a fixing member 2 provided with means for fixing.

]2] The holder member 1 can also be applied to the cable holder 7, in which the ferrite core 3, which is divided into two parts along the annular axis, is gripped by the dividing surface 33 so as to be openable and closable.

(3) Furthermore, the fixing means for the holder member 1 can also be achieved by the cable holder 7, which is constituted by the fixing members 2 provided at predetermined intervals.

[Function] That is, by fixing the holder member 1 in advance at a predetermined position on the wiring route of the cable 9, the cable 9 which requires EMI countermeasures can be provided with EMI countermeasures through the ferrite core 3.

Furthermore, in the event of a change, the ferrite core 3 can be opened, so the cable 9 can be easily taken in and taken out, and the cables 90 can be easily separated from the bundle and bundled.

Furthermore, since the fixing means of the fixing member 2 are provided at predetermined intervals, it is possible to easily change the position of the ferrite core 3, replace it to change its characteristics, add a new one, etc.

In order to take effective EMI countermeasures, it is important to route the wires through the ferrite core 3 at the cable holder 7 as close to the connection point of the cable 9 as possible.

In this way, measures against EMI noise to the cable can be taken, and it is possible to provide a cable holder that can be easily changed even after the device is completed.

〔Example〕

The present invention will be specifically described below with reference to embodiments shown in the drawings. The same reference numerals indicate the same objects throughout the figures. Figure 1 (
Fig. 2(a) is a block diagram of another embodiment of the present invention, and Fig. 2(b) shows the same state of use. show.

As shown in FIG. 1(b), the cable holder 7 of one embodiment is a case in which EMI measures are taken with emphasis on holding the cable 9, and the cable holder 7 is attached to the rear surface of the shelf 81 mounted on the device housing. The cables 9 are bundled (three bundles shown) and led out from both sides of the device housing (only the left side is shown), and are connected to the rear lower edge of the device main body 8 of the shelf 81. The fixing members 2 protrude rearward and are fixed to each other at predetermined intervals, and each bundle of cables 9 is passed through and held by a holder member 1 disposed in a predetermined manner, and is held by a connector 91 disposed on a backboard 82. Separate them at the connection positions, stand them up, and connect the ends to the terminals.

In this case, it is effective to suppress EMI noise commonly induced in the cable 9 passing through the ferrite core 3.

The cable holder 7 is as shown in FIG. 1(a).

Ferrite core 3 has external dimensions of 30 x 30 x length of 1511
1 is a hollow rectangular shape with a wall thickness of 5 fl, and is divided into two sections: a U-shaped cross section and an I-shaped cross section.

The holder member 1 that holds the ferrite core 3 is a nylon resin molded product, and has a U-shaped frame material with a U-shaped cross section and an I-shaped frame material that are superimposed along the outer shape of the ferrite core 3. One end of the holder member 1 is rotatable. The other end has a convex part 13 on the outside of the inner end, and a stopper hole 14 in which the convex part 13 fits and engages the outer end. In the center of the side opposite to the side, there is a 5flφ with a 5n square seat at the base.
A stud screw 15 protrudes from the nut 1 to be screwed.
6 is screwed in.

The fixing member 2 is formed from a 3 x 12 cm rectangular iron plate, and has three 5.5 square holes 23 and two 2
The rows are spaced in a staggered manner with 20 rows apart, and 5 rows in the Nagahira direction.
The holder members 1 can be arranged at minimum intervals, and one side of the ferrite core 3 can be opened and closed without any trouble.

To separate and bundle the cables 9, lift the outer end of the holder member 1, unlatch the end, and rotate the holder member 1 further. One side of the ferrite core 3 is opened, and the cable 9
can be freely put in and taken out.

In addition, when moving the wiring position of the cable 9, loosen the nut 16 fixing the holder member 1, and remove the holder member 1.
Remove it, insert it into the empty square hole 23 at a predetermined position, and tighten it again with the nand 16.

Note that the EMI noise attenuation characteristics can be changed by the characteristics of the ferrite core 3, so multiple types with the necessary characteristics are prepared.The ferrite core 3 is only held by the holder member 1, It has a structure that can be easily replaced.

In another embodiment, as shown in FIG. 2(b), the main focus is on EMI countermeasures, and the method is applied to the cable wiring 93, which is a source of EMI noise.
It is important to externally fit the ferrite core 33 as close as possible to the terminal 94 of the connector 91 to which the cable wiring 93 is connected.

This cable holder 77, as shown in FIG. 2(b),
It is composed of a holder member 11 that grips the ferrite core 33 and a fixing member 22 that is provided with fixing means for the holder member 11 and is fixed to the backboard 82.

The ferrite core 33 has an outer/inner diameter of 4/1.5 m and a length of 8
It is shaped like a crane bead and comes in several types depending on its characteristics.

The holder member 11 grips the outer diameter of the ferrite core 33,
It is a nylon molded product with both ends lined up and a protruding leg portion 17.

The fixing member 22 is a strip of nylon having approximately the same length as the connector 91. Both ends of the fixing member 22 are fixed to the bank board 82 by screws, and are arranged in parallel in contact with the connector 91. 24 is provided, and this fixing hole 2
4, the foot portion 17 of the holder member 11 is press-fitted to fix the ferrite core 33 at a required location.

〔Effect of the invention〕

As described above, the cable holder of the present invention provides OEM I9i sound countermeasures for the cable, provides a cable holder that can be easily changed even after the device is completed, and has great practical effects.

[Brief explanation of drawings]

FIG. 1 shows one embodiment of the present invention, FIG. 2 shows another embodiment of the present invention, and FIG. 3 shows a conventional example. In the figure, 1.11 is a holder member, 2.22 is a fixing member, and 3.
33.35 is the ferrite core, 7.75.77 is the cable holder, 8 is the device body, 9 is the cable, 13 is the convex part,
14 is a stop hole, 15 is a stud screw, 1
6 is the nut, 17 is the foot, 23 is the square hole,
24 is a fixing hole, 31 is a dividing surface, 76 is a band, 81 is a shelf, 82 is a bank board,
91 is a connector, 92 is a shielding tape, 93 is a cable wiring, and 94 is a terminal. Kabuto 1 Diagram Cb) EMI counter part part conventional diagram

Claims (3)

[Claims] (1) A holder member (1) that grips an annular ferrite core (3) into which a cable (9) is inserted and held; ) a fixing member (2) comprising means for fixing the
A cable holder comprising: (2) Claim (1) characterized in that the holder member (1) holds the ferrite core (3) divided into two parts along the annular axis at the dividing surface (33) so as to be openable and closable. cable holder. (3) Claim (1) characterized in that the fixing means for the holder member (1) is a fixing member (2) provided at a predetermined interval.
)Cable holder as described.