JP3427675B2 - Fixing tool for flat cable and core fixing method using the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixture for a flat cable and a core fixing method using the same, and more particularly to a flat cable used in an electronic device or the like.
ctro Magnetic Interferenc
e) A fixture for a flat cable for fixing a countermeasure core or the like and a core fixing method using the same.

[0002]

2. Description of the Related Art A flat cable is a cable formed by connecting a plurality of cables in a parallel flat plate shape. This flat cable is widely used in computers and various electronic devices.

When a ferrite core for EMI countermeasures is attached to this flat cable, a plastic case is conventionally used as shown in FIG. That is, first, the flat cable 1 is sandwiched between cores 42, and the sandwiched cores 42 are further covered with a plastic case 41.

In this case, the core 42 has a notch (not shown), and the flat cable 1 is inserted into the notch so that the flat cable 1 is sandwiched by the core 42 as shown in the drawing. To do. Further, the plastic case 41 is provided with a hinge part (not shown), and the case is spread around the hinge part to form the core 42.
The case 41 is closed so that the state shown in the figure is obtained.

Next, the plastic case 41 is attached to a flat surface such as the surface of the housing 40 with a double-sided adhesive tape or the like. By mounting the core 42 in this manner, the position of the core 42 is fixed with respect to the flat cable 1.

Further, Japanese Utility Model Laid-Open No. 2-114322 discloses a flat cable support as shown in FIG. Referring to FIG. 1A, the flat cable 1 is attached to the cable support fitting 101 by attaching the connection band 107 via the pressure fixing member 105.
Is fixed. In this case, the cable support fitting 101
A plurality of mounting holes 102 are formed at predetermined intervals. Then, the connection band 107 is inserted into the mounting hole 102 to tighten the flat cable 1. By doing so, the flat cable 1 is attached to the cable support fitting 101.
It is fixed to. The pressing and fixing member 105 is provided with a fixing groove 6 that intersects in a cross shape, and the connection band 107 is engaged in the fixing groove 6 and tightened.

On the other hand, referring to FIG. 1B, a plurality of notches 108 are formed at predetermined intervals on the upper and lower sides of the cable support fitting 110.
Are formed. Then, by using the notch 108 to hang the connection band 107 in a plow shape,
The flat cable 1 is abutted and supported.

Further, referring to FIG. 1C, a plurality of mounting holes 102 are formed in the cable support fitting 101 at predetermined intervals. Then, the flat band 1 is supported by inserting the connection band 107 into the mounting hole 102, hooking the flat band 1 and tightening it.

[0009]

In the prior art shown in FIG. 4 described above, the plastic case is mounted on the surface of the housing, so that it cannot be mounted in the immediate vicinity of the connector. Therefore, there is a drawback that a sufficient effect as an EMI countermeasure cannot be expected.

Further, the above-mentioned prior art shown in FIGS. 5A to 5C fixes the flat cable itself and cannot take EMI countermeasures. Also,
Even if the pressure fixing member 105 shown in FIG. 5A is changed to a ferrite core, the state is the same as when a bar magnet is attached to the flat cable, and no effect can be expected as an EMI countermeasure. Further, since there is no groove or the like for preventing the flat cable from being displaced, the flat cable may be displaced when the flat cable is pulled. Further, at that time, there is a drawback that the flat cable is damaged by the corners of the pressing and fixing member 105.

The present invention has been made in order to solve the above-mentioned drawbacks of the prior art, and the object thereof is to fix a ferrite core to a flat cable without damaging the flat cable and to take appropriate measures against EMI. A fixture for a flat cable and a core fixing method using the same.

[0012]

A fixture for flat cables according to the present invention is a fixture for flat cables for fixing a film-like material provided on the surface of a flat cable having one main surface and another main surface. A curved portion that forms a curved surface, and the fixing band presses both end portions of the flat cable in a state of pressing a portion of the main surface of the flat cable where the film-shaped material is provided to the curved surface. A fixture including a band fixing portion for fixing, and a fixing band for pressing one main surface of the flat cable against the curved surface by contacting the other main surface of the flat cable are characterized by being included.

The core fixing method using the flat cable fixing tool according to the present invention is a core fixing method using the flat cable fixing tool, and a step of inserting the flat cable into the hollow portion of the hollow core, A fixture having a step of covering at least a part of the core and at least a part of the flat cable with a heat-shrinkable tube in the inserted state, and a band fixing part for fixing each of the curved surface and both ends of the fixing band. Pressing the curved surface in contact with a portion of the main surface of the flat cable that is covered by the heat-shrinkable tube, and heat-shrinking the other main surface of the flat cable in this pressed state. The fixing band is brought into contact with the portion covered with the tube, and both ends of the band are fixed by the band fixing portion. Characterized in that it comprises a step.

In short, in the present invention, the heat shrinkable tube including the ferrite core through which the flat cable is inserted is covered, and the heat shrinkable tube is fixed by the fixing band and the fixture. The fixture is provided with a curved surface, and both ends of the fixing band are fixed while the heat-shrinkable tube is pressed against the curved surface.

By doing so, since the flat cable is fixed while being pressed against the curved surface, the heat-shrinkable tube does not move in the length direction of the flat cable. Therefore, the core can be fixed at an appropriate position as a countermeasure for EMI. In addition to the core, a label or the like can be fixed on the surface of the flat cable.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing a state after core fixing by a core fixing method using a flat cable fixing tool according to an embodiment of the present invention. In the figure, the same parts as those in FIGS. 4 and 5 are designated by the same reference numerals.

As shown in the figure, after fixing by the main fixing method, the ferrite core 42 is attached to the flat cable 1, and the core 42 and the flat cable 1 are covered with the heat shrinkable tube 20. . The portion of the surface of the flat cable 1 covered with the heat-shrinkable tube 20 is the fixing band 3 and the fixture 2.
It is fixed at.

The fixture 2 will now be described with reference to FIG. The figure (a) is a top view of the fixture 2, and the figure (b).
Is a front view of the fixture 2, and FIG. 7C is a side view of the fixture 2. In each of these figures, the same parts as those in FIG. 1 are designated by the same reference numerals.

Referring to FIG. 1A, the fixture 2 is provided with fixing portions 21a and 21b for fixing the fixing band at both ends of the main body 25. The fixture 2 is provided with three curved portions 22a, 22b and 22c so as to connect the two fixed portions 21a and 21b.

As shown in FIG. 2B, these curved portions 22a to 22c have a curved and raised shape with respect to the main body 25, and at the midpoint in the longitudinal direction of the main body 25. The distance from the main body 25 is maximized. The curved surface formed by the curved portions 22a to 22c is pressed against the surface of the flat cable via the heat-shrinkable tube, as described later. The number of curved portions may not be three.

Further, as shown in FIG.
The fixing portions 21a and 21b are provided with holes 23 for inserting the fixing band. The hole portion 23 is slightly larger than the cross section of the fixing band, and a claw portion 24 made of metal or the like further projects inward of the hole portion 23.
As a result, the tip of the claw portion 24 engages with the uneven portion provided on the surface of the fixing band, which will be described later, and the pressed state of the flat cable on the curved surface can be maintained.

Concavities and convexities as shown in the drawing are provided on the surface of the curved surface, and the pressing force can be concentrated on the convex portion to prevent the heat shrinkable tube 20 from moving with respect to the cable 1. In this example, the distance between the fixed portions 21a and 21b is equal to the width of the flat cable. However, if the distance between the fixed portions is larger than the width of the flat cable, both of them are equal. You don't have to do it. That is, in the fixed state, there may be a gap between the end portion of the flat cable and both fixing portions.

Next, the fixing band 3 will be described with reference to FIG. 1A is a plan view of the fixing band 3, and FIG. 1B is a side view of the fixing band 3. In these drawings, the same parts as those in FIGS. 1 and 2 are indicated by the same reference numerals. Referring to FIG. 3A, the fixing band 3 has an uneven portion 31 for engaging with the claw portion 24 of the fixing tool 2 described above.
have. Also, the ends 32 a and 3 of the fixing band 3
The width of 2b becomes narrower toward the tip thereof. Therefore, in the fixing band 3, the end portions 32a and 32b are easily inserted into the hole portion 23 of the fixing tool 2 described above.

The fixture and the fixing band described above are made of an elastic material such as nylon.

Returning to FIG. 1, a method of fixing the ferrite core by using the above-described flat cable fixture will be described.

First, the flat cable 1 is inserted into the hollow portion of the ferrite core 42, and the ferrite core 42 is attached to the flat cable 1. The position of attachment is the closest to a connector (not shown) provided on the flat cable 1.

Next, the flat cable 1 and the ferrite core 42 inserted therein are covered with a heat-shrinkable tube 20 (hatched portion). Then, heat is applied to the heat-shrinkable tube 20 to bring it into a shrunk state as shown in FIG. In this case, even if you do not cover all of the ferrite core, cover at least a part of the core and at least a part of the flat cable with a heat-shrinkable tube so that it will not shift in the length direction of the flat cable with the fixture attached. I'm fine.

Further, the heat-shrinkable tube 20 is attached to the fixing band 3
And the fixing device 2. In this case, the fixed parts 21a and 2
The fixture 2 is attached so that the flat cable 1 is positioned between the fixed band 3 and the flat cable 1b, and the ends 32a and 32b of the fixing band 3 are fixed by the fixing portions 21a and 21b, respectively.

More specifically, the end 32 of the fixing band 3
a is inserted into the hole 23 of the fixed portion 21a in the direction of the arrow Ya. By being inserted in this way, the above-mentioned claw portion 24 and the uneven portion 31 are engaged with each other. Similarly, the end portion 32b of the fixing band 3 is also inserted in the hole 23 of the fixing portion 21b in the direction of the arrow Yb, and the claw portion 24 and the uneven portion 31 are engaged with each other.

The heat-shrinkable tube 20 is attached to the fixing band 3
When fixing with the fixture 2, the surface of the flat cable 1 is pressed against the surface of the curved portion provided in the fixture 2,
The fixing band 3 is attached to the opposite surface side. That is, the fixture is pressed so that the curved surface abuts the portion of the main surface of the flat cable 1 covered with the heat-shrinkable tube 20. In this way, since the fixture 2 is provided with the curved surface and the central portion of the fixture 2 is raised, the band 3
The tightening force is applied to the flat cable 1 uniformly.

Finally, the end 32 protruding from the hole 24 of the fixture 2 so that both ends of the band 3 do not get in the way.
Cut a and 32b.

By adopting the above method, EMI
As a countermeasure, the ferrite core can be attached at an appropriate position such as near the connector. Therefore, it is possible to obtain a greater effect as a measure against EMI. If such a fixture and a fixing band are used, a flat surface for fixing the core, such as a support metal fitting, is not required, and thus the versatility is high.

Further, since the heat-shrinkable tube is provided between the flat cable and the fixing band and the fixture, the cable is not damaged. And
Since the fixture is provided with a curved surface and the central portion of the fixture is raised, the tightening force of the band is evenly applied to the flat cable. It should be noted that since the curved surface has irregularities, the pressing force can be concentrated on the convex portion to prevent the heat-shrinkable tube from moving with respect to the cable.

By the way, in the above-mentioned example, the band fixing portion and the end portion of the flat cable are in contact with each other, but they may not be in contact with each other. Even if they are not in contact, if the curved surface is pressed against the part of the main surface of the flat cable that is covered by the heat shrink tube, the heat shrink tube will not move in the length direction of the cable. is there.

Further, it is apparent that the fixture of the present invention can also be used when fixing a film-shaped material other than the heat-shrinkable tube, such as a label, on the surface of the flat cable.

Furthermore, in the present fixing method, since the band and the fixture are not integrated, they can be easily removed. If it needs to be removed and reattached, new fixtures and straps can be facilitated.

The present invention can further have the following aspects in connection with the description of the claims.

(1) The fixture for a flat cable according to claim 1, wherein the film-like material is a label provided on the surface of the flat cable.

(2) The core fixing method according to claim 4, wherein the curved surface of the curved portion is provided with irregularities.

[0041]

As described above, according to the present invention, both ends of the fixing band are covered with the heat shrinkable tube including the ferrite core having the flat cable inserted therethrough, and the heat shrinkable tube is pressed against the curved surface of the fixture. By fixing the portion, the ferrite core or the like can be fixed at a desired position such as in the vicinity of the connector without damaging the flat cable, and there is an effect that an EMI countermeasure can be appropriately taken.

[Brief description of drawings]

FIG. 1 is a diagram showing a state after a core is fixed by a core fixing method using a flat cable fixture according to an embodiment of the present invention.

FIG. 2 is a three-view drawing showing the structure of a band fixing tool, FIG. 2 (a) is a plan view, FIG. 2 (b) is a front view, and FIG. 2 (c) is a side view.

3A and 3B are two views showing the structure of a fixing band, FIG. 3A is a plan view and FIG. 3B is a side view.

FIG. 4 is a diagram showing a state after core fixing by a conventional core fixing method using a flat cable fixture.

5A to 5C are views showing a state after fixing by another conventional flat cable fixing method.

[Explanation of symbols]

1 flat cable 2 fixtures 3 fixed bands 20 heat shrink tube 21a, 21b fixed part 42 Ferrite core

Claims (4)

(57) [Claims] 1. A fixture for a flat cable for fixing a film-like material provided on a surface of a flat cable having one main surface and another main surface, the bending portion forming a curved surface, and the fixing band. Is a fixture including a band fixing portion that fixes both ends of the band in a state in which a portion of the main surface of the flat cable on which the film is provided is pressed against the curved surface, A fixture for a flat cable, comprising: a fixing band that presses one main surface of the cable against the curved surface by contacting the other main surface of the cable. 2. The fixture for a flat cable according to claim 1, wherein the film-like material is a heat-shrinkable tube that covers the flat cable and a core attached to the flat cable. 3. The fixture for a flat cable according to claim 1, wherein the curved surface of the curved portion is provided with irregularities. 4. A method for fixing a core using a fixture for a flat cable, comprising a step of inserting a flat cable into the hollow portion of a hollow core, and at least a part of the core and the flat cable in the inserted state. A fixing tool having a step of covering at least a part with a heat-shrinkable tube, and a band fixing part for fixing both end portions of a fixing band to each of the fixing bands, Pressing the curved surface so that it abuts against the portion covered with the fixing belt, and in this pressed state, the fixing band is applied to the portion of the other main surface of the flat cable covered with the heat shrinkable tube. And a step of fixing both ends of the band by the band fixing portion.