JP2002009479A - Inserting and fixing structure of shield cables - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an integral structure of an electromagnetic wave shield on a plurality of cable lead-ins with the grounding function of shield cables, this being difficult in the conventional frame structure and facilitate assembling and maintenance works whereas cables are mounted in many layers in the front and rear direction, thereby improving the mounting density. SOLUTION: Shield cables 5 are fixed by a pressure board 9 and screws 10 to a support metal 7 capable of supporting a plurality of shield cables to form a cable support assembly 12 and this is fixed to a ground plate 13 to ground it. The assembly 12 is structured to be removably mounted from above on the ground plate 13. The assembly 12 is electrically connected between the plate 13 and adjacent cable support assembly to form an electromagnetic wave shield structure and hence a grounding and electromagnetic wave shield structure at a cable lead-in support part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grounding process for a shielded cable drawn into a housing and an electromagnetic shielding structure of a drawn portion.

[0002]

2. Description of the Related Art In recent years, countermeasures against electromagnetic interference generated from information equipment and the like have become important, and information equipment having an earth grounding structure and an electromagnetic wave shielding structure of a cable introduced from outside the machine have become popular. . On the other hand, the amount of signal cables introduced from outside the machine into information equipment and the like is increasing, and high-density mounting of cables and ease of assembly and maintenance are required. On the other hand, the conventional technology is disclosed in Japanese Patent Laid-Open No. 6-137.
As described in Japanese Patent Application Laid-Open No. 65-265 and Japanese Patent Application Laid-Open No. 10-242682, the cable is fixed to the housing by a supporting bracket having multiple supporting portions and fixing screws between the cables.

[0003]

In the above prior art, electromagnetic waves in the housing leak from the openings and gaps of the housing.
It is necessary to form the electromagnetic wave shielding structure with a structure different from the cable support structure. In addition, when increasing the number of signal cables that can be accommodated in the housing, or when providing a support structure in multiple stages before and after in order to increase the mounting density, the support structure is stepped or inclined in order to enable attaching and detaching work of the fixing screw. It has to be configured, which causes factors such as an increase in the number of structural components, complexity and deterioration in maintainability, and an increase in cable storage capacity.

[0004]

In order to solve the above-mentioned problems, the present invention forms a cable support assembly by fixing a shielded cable with a holding plate and a screw to a support fitting capable of supporting a plurality of shielded cables. Grounding by fixing to the housing. The cable support assembly is configured to be individually attached to and detached from the ground plate of the housing while fixing the cable. As a result, the cables on the rear side can be attached and detached even after the cable support assembly is attached to the housing in multiple stages, eliminating the need to mount the cable support assembly in a stepped or inclined shape, and improving the cable storage density And the structure can be simplified. In addition, the shielded cable is provided with a band that thickens the outer shape of the shielded cable, and the support bracket includes a holding structure that allows the band to be hooked, and during the operation of fixing a plurality of cables with the holding plate. Even if it is not held down, the structure will not fall off, facilitating assembly and maintenance work. further,
The cable support assembly is fixed to the housing and electrically connected between the portion in contact with the housing and the adjacent cable support assembly to form an electromagnetic wave shielding structure, so that the grounding and the electromagnetic wave shielding structure can be simultaneously performed at the cable introduction support portion. Can be formed.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

A signal cable 2 introduced into the housing from the outside of the housing 1 is a shielded cable 5 in which an outer peripheral portion of a core wire is covered with an insulating coating 3 and a metal braided shield layer 4 in this order, and the shield layer 4 is exposed. A band 6 is wound on the uppermost part of the portion so that the outer shape of the cable becomes thicker. A plurality of (eight in the illustrated example) shield cables 5
By supporting the band portion 6 on the U-shaped bracket 8 of the cable support bracket 7, the shield cable is prevented from falling off even before the holding plate 9 is attached. The cable support fitting 7 fixes the shielded cable 5 with the right and left fixing screws 10 via the holding plate 9, and at this time, the tip of the U-shaped fitting 8 is inserted into the slit hole 11 of the holding plate 9 to form a clamp forming a lattice structure. The structure constitutes one cable support assembly 12. Ground plate 13 of housing 1
A screw hole 14 is provided at an upper portion of the cable support assembly 12, and the above-mentioned cable support assembly 12 is fixed from above by a fixing screw 10. This cable support assembly 12 is fixed to the ground plate 13 in parallel from the back of the housing in multiple stages (four stages in the illustrated example) in a continuous manner, and the flange 1 of the cable support assembly on the back side is
5, the flange 15 of the cable assembly on the near side sequentially overlaps. The grounding plate 13, the cable support fitting 7, the holding plate 9, and the U-shaped fitting 8 are all made of a conductive material, and are in contact with the cable support assembly 12, which forms a lattice structure and has a small opening. By bringing the base plate 13 and the flange 15 into contact, the shield layer 4 of the cable is completely grounded to the frame ground at the shortest distance, and at the same time, an electromagnetic wave shielding surface can be formed.

The cable support assembly 12 on the back side
In this example, maintenance can be performed by sequentially shifting the front cable support assembly toward the user. Alternatively, rather than contacting with a flange structure, the use of a conductive soft material such as a shield gasket allows maintenance without having to move adjacent cable support assemblies.

[0008]

According to the present invention, the electromagnetic wave shield of a plurality of shielded cable introduction portions and the grounding function of the shielded cable can be integrated with each other, which is difficult with the conventional housing structure. Even if a cable is mounted on a cable, the structure in which the cable support brackets can be attached and detached independently of each other facilitates assembly and maintenance work and improves the mounting density. Also, since the signal cable does not need to be a shielded cable inside the housing from the earth grounding part, that is, the electromagnetic wave shielding part, it can be directly connected to a printed circuit board or connector that does not have an electromagnetic wave shielding structure, or can be connected within a single shielded cable. It can also accommodate signal cables with multiple connections.

[Brief description of the drawings]

FIG. 1 is a perspective view of a structure showing one embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Housing, 2 ... Signal cable, 3 ... Insulation coating, 4 ... Shield layer, 5 ... Shielded cable, 6 ... Band, 7 ... Cable support bracket, 8 ... U-shaped bracket, 9 ... Holding plate, 10 ... Fixed Screw, 11: slit hole, 12: cable support assembly, 13: ground plate, 14: screw hole, 15: flange,
16 ... Cover plate.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H02G 15/105 H05K 7/00 H 5G375 H05K 7/00 H02G 3/26 NF term (Reference) 4E352 AA03 AA06 AA16 BB02 BB05 CC12 CC22 DD02 DR02 DR19 FF04 GG10 5E321 AA03 AA14 BB60 CC22 GG05 5G016 AA01 CE05 DA03 DA08 5G363 AA09 BA01 DA12 DA15 DC08 5G365 CB01 CC02 CD01 CD07 5G375 AA12 CA03 CA17 DA08 DB04 DB26

Claims (3)

[Claims] An electronic device having a housing accommodating an electronic component and a plurality of shielded cables connected to the electronic component in the housing includes the shielded cable and a support fitting capable of supporting a plurality of the shielded cables. An earth grounding structure that constitutes a cable support assembly and electrically connects the cable support assembly to a ground plate of a housing. By assembling the cable support assembly, the cable support assembly mounting portion is grounded at the same time as the electromagnetic wave shield. Introduction and fixing structure of shielded cable characterized by comprising a surface. 2. A portion according to claim 1, wherein a plurality of U-shaped metal fittings provided on the support metal fitting in accordance with the thickness of the shielded cable are arranged in a row in a row, and are fastened for the purpose of grounding and supporting the shielded cable. The outer diameter increasing portion is provided on the upper portion of the cable, and the outer diameter increasing portion can be hung on the U-shaped metal fitting, and the tip of the U-shaped metal fitting portion contacts the holding plate of the shielded cable or is inserted into the slit hole. A cable support structure characterized in that a lattice structure is formed by, for example, reducing the opening. 3. The cable supporting structure according to claim 1, wherein the grounding and supporting metal can be independently attached to and detached from the grounding plate of the housing.