JP2010010198A - Bending fixture for flexible flat high-frequency cable for high speed transmission - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate the routing of a flexible flat high-frequency cable P for high speed transmission involving bending without causing transmission loss. <P>SOLUTION: A cable bending fixture 10 that is disposed in a bend Pa of the cable P and fixed to a mounting frame F for electronic parts includes a triangular member 11 having an arc face 13 for guiding the bend in an arc for bending, guides 12a and 12b at two sides, and a leg 15 for fixing to the mounting frame. The cable P is guided by one guide 12a through guide surfaces 14b and 14a in one direction X, then bent along the arc face 13, and guided by the other guide 12b through guide surfaces 14a and 14b in another direction Y, for example a 90-degree direction. An appropriate curvature R of the arc face 13 is experimentally or empirically determined, for example at 2.5 mm, in consideration of the structure and characteristics of the cable and the bending angle between one direction and the other direction. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a bending fixture for a flexible flat high-frequency cable for high-speed transmission used for transmission / reception of signals and the like between various electronic components and circuit boards in various electronic devices such as liquid crystal televisions, plasma televisions, and copying machines. Is.

For example, recent thin high-precision large-screen televisions require high-speed transmission of signals and the like, and the cable itself that is a signal transmission member is required to withstand the high-speed transmission.
As a high-speed transmission cable, there is a flexible flat high-frequency cable (hereinafter referred to as “flat cable” or “cable” as appropriate), and this cable shields the entire area around the dielectric layer that wraps the parallel conductors. Some are surrounded by layers (see FIG. 2 of Patent Document 1). For example, as shown in FIG. 9, polyethylene terephthalate in which conductors 1 arranged in parallel are wrapped with a dielectric layer 2 such as low-loss polyolefin, and a copper foil 3 a of about 9 μm is stretched over the upper and lower surfaces of the dielectric layer 2 ( (PET) (thickness: about 12 μm) A shield layer 3 made of 3b is provided, and further around it, a bag-shaped PET tape (thickness: about 6 μm) 4b covered with a copper foil 4a of about 9 μm for ground function There is one in which the outer skin 4 is wound with the copper foil 4a inside. The dielectric layer 2 and the shield layer 3 are bonded via the PET 3b on the inside thereof, and the shield layer 3 and the outer skin 4 are not bonded, and both the copper foils 3a and 4a are movable while being in contact with each other. As the conductor 1, a flat type, a circular type or the like is adopted.
JP 2008-47505 A

On the other hand, this type of flat cable P is guided and bent from one direction in terms of space saving when wiring is provided between various electronic components and circuit boards. In many cases, the surface is inclined (with a bending angle θ) and guided in another direction (see FIG. 11 of Patent Document 2).
JP 2007-104828 A

  When the flat cable P is bent, if the bending is performed randomly or if the bent portion is pressed strongly in order to reduce the bulk, the conductor 1 may be damaged. For this reason, caution is required when routing the flat cable P. In particular, the flexible flat high-frequency cable P has a narrow space between the conductors 1 due to a demand for miniaturization, and the shield layers 3 and 4 are located over the entire surface of the dielectric layer 2, so that the bending thereof is performed. Depending on the degree, “cracks” are likely to occur on the inner side of the bent portion and “tears” on the outer side. The wrinkles and tears of the shield layers 3 and 4 lead to transmission loss (transmission characteristics deteriorate).

  In addition, when the bending angle θ from one direction to the other direction of the flat cable P varies, and when connecting between electronic components (when routed), the bending angle θ is different from the bending angle between electronic components. Unnecessary bending or twisting occurs in the cable P, leading to deterioration in efficiency of connection work (assembly work), and deterioration of transmission characteristics based on the twist or the like. In particular, since the wiring area of the flat cable P is narrow and limited today, it is preferable that the bending angle θ is fixed to be optimal (compatible) at the wiring location.

  In view of the above situation, the present invention can easily perform the work without incurring transmission loss even in the wiring with the bending of the flexible flat high-frequency cable P for high-speed transmission, and obtain a stable bending fixed state. The challenge is to do so.

In order to achieve the above object, the present invention first focuses on the fact that a flat cable bending jig is bent with an arcuate surface (see FIG. 7 of Patent Document 3). The inner surface of the cable bending portion is guided by an arc surface.
As the curvature of the arc surface (cable bending curvature) R increases, the risk of the above-described wrinkles and tears decreases, but the thickness of the bent portion increases and the installation space increases. On the other hand, if the curvature R is reduced, the mounting space can be reduced, but the risk of wrinkling and tearing increases. For this reason, the curvature R of the arc surface is appropriately determined based on experiments, mounting, and the like in consideration of the configuration / characteristics of the cable and the bending angle θ from one direction to the other direction. At this time, the bending angle θ is also appropriately determined according to the arrangement of the electronic components to be connected.
JP 2003-68157 A

Next, according to the present invention, the jig having the arc surface is fixed to a mounting frame (housing) such as an electronic component.
If the cable bending jig is fixed to the mounting frame, the bent portion is fixed, so that the cable mounting state is stable.
As the fixing means, it is conceivable to use a part of the bending jig to fix the screw to the mounting frame, to fix the band, to bond, or the like. However, a leg can be separately provided and attached via the leg. This leg is screwed to the mounting frame, adhered, or fitted into a hole in the mounting frame.

  As a specific configuration of the present invention, a flexible flat high-frequency cable for high-speed transmission is led from one direction and bent, and the flexible flat high-frequency cable is led in another direction inclined with respect to the one direction. A cable bending fixture that is interposed in a portion and is fixed to a mounting frame such as an electronic component, wherein when the flexible flat high-frequency cable is bent, an arc surface that guides the bending portion in an arc shape, and the mounting frame It is possible to adopt a configuration having a fixing member for fixing to the head.

In this configuration, a flat guide surface extending in at least one of one direction or the other direction in which the flexible flat high-frequency cable is guided may be provided continuously to the arc surface.
In this way, the guide surface guides at least one path leading to the bent portion of the cable, so that the stability of the bent portion is improved.

As a more specific configuration of the present invention, it is composed of a triangular plate member in plan view, the edge of one side of the triangular member is the arc surface, and the guide surface is formed toward the other two sides. It can be set as the structure.
In this configuration, if a guide piece is provided from at least one of the other two sides of the triangular member toward the direction in which the flexible flat high-frequency cable is guided, the cable is guided by the guide surface of the guide piece as described above. Since at least one of the paths leading to the bent portion is guided, the stability of the bent portion is improved.
At this time, if the flexible flat high-frequency cable is provided with a guide projection for guiding the side edge of the cable along the direction in which the flexible flat high-frequency cable is guided, the direction in which the cable is guided is regulated, and the bending direction of the cable (angle θ) is stabilized, and the stability of the bent portion is improved with the stabilization.

  As the fixing member, for example, a leg made of a rod-shaped member can be adopted, and the leg is formed with a slit in the axial direction from the tip, and the leg is contracted through the slit in the hole of the mounting frame. The leg can be fixed to the mounting frame with a reaction force against the reduced diameter.

  The cable bending fixtures having the above-described configurations can obtain a structure in which a flexible flat high-frequency cable for high-speed transmission is stably fixed to a mounting frame such as an electronic component.

  Since the present invention has been described above, the flexible flat high-frequency cable for high-speed transmission can be bent without deteriorating its transmission characteristics, and can be stably attached to the frame at a required bending angle, and the stable bending and fixing can be performed. The state can be obtained. If the fixed state of the bent part is stable, the flexible cable will not move, and there will be no fluctuations in the wiring, so that stable high-speed transmission can be ensured and the occurrence of abnormal noise in the housing due to the wiring fluctuations can be prevented. Can do.

  1 to 3 show an embodiment of the present invention. As shown in FIG. 1, a bending fixture 10 according to this embodiment includes electronic components B and B attached to a frame F made of punching metal. Are connected by a flexible flat high-frequency cable P for high-speed transmission, the cable P is interposed in a bent portion Pa bent at a right angle (90 degrees = bending angle θ) in the middle, and the bent portion Pa is encased. It is attached and fixed to the frame F which is one of the bodies.

As shown in FIGS. 2 and 3, the bending fixture 10 is a plate member of a triangular resin molded product in a plan view (in FIG. 3 (b), a portion composed of a side indicated by reference numeral 13 and a side indicated by a chain line). 11 and the guide pieces 12a and 12b of the resin molded product are provided in the directions X and Y where the cable P is further guided from the two sides of the member 11 (the chain line side).
The side edge of the oblique side of the triangular member 11 is an arc surface 13, and when the cable P is bent, the arc surface 13 guides the inner surface of the bent portion in an arc shape (see the chain line in FIG. 2). The guide surface 14a (the surface of the triangular member 11) of the cable P is continuous from both end edges of the circular arc surface 13, and the guide surface 14a is continuous with the guide surfaces 14b of both guide pieces 12a and 12b. For this reason, the cable P is guided from one direction X along one guide piece 12a, bent at the circular arc surface 13, and guided in the other direction Y along the other guide piece 12b (see the chain line in FIG. 2). . In this embodiment, the curvature R of the arc surface 13 is 2.5 mm.

  Further, the guide pieces 12a, 12b are provided with guides 14 made of protrusions (projections) along the edges on the side edges of the guide surface 14b. Y is positioned (guided). The guide 14 can also be provided on the guide surface 14 a of the triangular member 11.

  A rod-like leg 15 is provided on the lower surface of the apex portion of the triangular member 11 by integral molding, and a slit 16 is formed in the axial direction from the tip. For this reason, when the leg 15 is fitted into the hole h of the frame F by reducing the diameter via the slit 16, the leg 15 is fixed to the frame F with a reaction force against the reduced diameter. The leg 15 may be any part of the triangular member 11 and the guide pieces 12a and 12b as long as it does not interfere with the bending action of the cable P. For example, the leg 15 may be the back surface of the guide piece 12b. In the figure, 17 is a cavity (hole) for lightening the bending fixture 10.

  In order to route the flexible flat high-frequency cable P for high-speed transmission shown in FIG. 9 with the bending angle θ: 90 degrees with the bending fixture 10, first, as shown in FIG. The guide member 12a is guided from one direction X through the guide surface 14b and the guide surface 14a of the triangular member 11, bent at the circular arc surface 13, and then guided in the other direction Y of the other guide piece 12b. It is guided through the surface 14a and its guide surface 14b. In this state, the cable P and the jig 10 are integrated by an appropriate band b (see the chain line in FIG. 1 and the chain line in FIG. 6).

Thereafter, the legs 15 are fitted into the holes h of the frame F, and the bending fixture 10 and the cable P are attached (wired) at required positions, and the cable P is connected to the electronic component B and the like. Thereafter, the cable P and the jig 10 are appropriately fixed to the frame F by the band b or the like (see the solid line in FIG. 1).
Note that after temporarily fixing the jig 10 to the frame F, the cable P may be routed at the required bending angle θ with the bending fixture 10. Further, the fixing of the bending fixture 10 of the cable P and the fixing of the bending fixture 10 to the frame F can be performed by the same fixing member such as the band b. Further, in a straight (straight) state without bending the cable P, it is fastened to a part of the bending fixture 10 with double-sided tape or the like, and after fixing the bending fixture 10 to the frame F, the guide pieces 12a, 12b are guided ( The cable P can be bent and fixed as a starting point.

4 and 5 show another embodiment, and the bending fixture 20 of this embodiment is such that the bending angle θ of the cable P is set to 135 degrees. The operation is also substantially the same except for the bending angle θ.
As described above, if the triangular shape of the triangular member 11 is changed according to various bending angles θ and the guide pieces 12a and 12b are provided in accordance with the change, various embodiments of the present invention can be obtained. .

Each of the above embodiments has the guide pieces 12a and 12b, but has no guide pieces (FIG. 6 (a)), and has only one guide piece (FIGS. (B) and (c). ) Can implement the present invention. In these cases, as shown in each drawing, the cable P and the bending fixture 30 are integrated and fixed to the frame F with an appropriate band b.
Moreover, when providing the leg 15, as shown in FIG. 7, the leg 15 is provided in the site | part which does not have trouble in the wiring of the cable P (refer the figure (b)). If there is no such part, a lateral projecting piece 31 is provided on the side edge that does not hinder the arrangement and is provided on the projecting piece 31 (see FIG. 5A). For example, as shown in FIG. 7C, an annular guide 18 may be provided on each guide surface 14a, 14b, and the cable P may be passed therethrough to stabilize the positioning of the cable P. it can.

  Further, as shown in FIG. 8, the bending fixture 40 may be configured such that the arc surface 13 is not a triangular member 11 but a bar-like member 41. In this case, the legs 15 can be provided at one end or both ends as illustrated. If the legs 15 are provided at both ends, the bending fixture 40 is positioned with respect to the frame F. However, since the positioning position is determined by the position of the hole h, it is difficult to cope with a change in the bending angle θ. On the other hand, when the number of the legs 15 is one, the rod-shaped member 41 can be turned with the legs 15 as fulcrums, and therefore it is easy to cope with the change of the bending angle θ. In this case, the rod-shaped member 41 is fixed by the band b or the like. As shown in FIG. 5B, a guide / cover 42 may be provided.

  Further, the flexible flat high-frequency cable P for high-speed transmission that can be employed in the present invention is not limited to that shown in FIG. 9, but can be applied to all flexible flat high-frequency cables for high-speed transmission whose transmission characteristics deteriorate due to bending. . Further, the mounting frame F is not limited to the punching metal, and includes a frame installed in various electronic devices.

  Thus, it should be considered that the embodiments disclosed herein are illustrative and non-restrictive in every respect, and the scope of the present invention is not limited to the above meaning, but is defined by the claims. And all modifications within the meaning and scope equivalent to the terms of the claims are intended to be included.

The schematic plan view which shows the attachment aspect of one Embodiment of this invention The perspective view of the bending fixture of the embodiment The bending fixture is shown, (a) is a front view, (b) is a plan view, (c) is a left side view, (d) is a right side view, (e) is a bottom view, and (f) is (b) ) Right cut side view The perspective view of the bending fixture of other embodiment The bending fixture is shown, (a) is a front view, (b) is a plan view, (c) is a left side view, (d) is a right side view, (e) is a bottom view, and (f) is (b) ) Right cut side view The perspective view of each example of the bending fixture of other embodiment The perspective view of each example of the bending fixture of other embodiment The perspective view of each example of the bending fixture of other embodiment Cutaway example of flexible flat high-frequency cable for high-speed transmission

Explanation of symbols

10, 20, 30, 40 Bending fixture 11 Triangular member 12a, 12b Guide piece 13 Arc surface 14 Guide protrusion 14a Triangular guide surface 14b Guide piece guiding surface 15 Leg 41 Bending fixture rod-like member b Fixing band h Mounting frame hole θ Cable bending angle F Mounting frame R Cable bending rate (curvature of arcuate surface 13)
P Flexible flat high-frequency cable for high-speed transmission Pa Bending part of flexible flat high-frequency cable for high-speed transmission

Claims (7)

The high-speed transmission flexible flat high-frequency cable (P) is led from one direction (X), bent, and led to another direction (Y) inclined with respect to the one direction (X). A cable bending fixture (10, 20, 30, 40) interposed in a bending portion (Pa) of a flat high frequency cable (P) and fixed to a mounting frame (F) such as an electronic component (B). ,
When the flexible flat high-frequency cable (P) for high-speed transmission is bent, an arc surface (13) for guiding the bent portion (Pa) in an arc shape and a fixing member (15) for fixing to the mounting frame (F) And b) a cable bending fixture.   A flat guide surface (14a) extending in at least one of the one direction (X) and the other direction (Y) to which the flexible flat high-frequency cable (P) for high-speed transmission is led is connected to the circular arc surface (13). The cable bending fixture according to claim 1, wherein the cable bending fixture is provided.   In plan view, it is composed of a triangular plate member (11), and the edge of one side of the triangular member (11) is the arc surface (13), and the guide surface (14a) is formed toward the other two sides. The cable bending fixture according to claim 2, wherein the cable bending fixture is provided.   Guide pieces (12a, 12b) are provided from at least one of the other two sides of the triangular member (11) toward the direction (X, Y) where the flexible flat high-frequency cable (P) for high-speed transmission is guided. The cable bending fixture according to claim 3.   5. A guide projection (14) for guiding a side edge of the cable along a direction (X, Y) in which the flexible flat high-frequency cable (P) for high-speed transmission is guided. The cable bending fixture according to any one of the above.   The fixed member is a leg (15) of a rod-like member, and a slit (16) is formed in the axial direction from the tip thereof, and the leg (15) is inserted into the hole (h) of the mounting frame (F). The base plate (15) is fixed to the mounting frame (F) with a reaction force against the reduced diameter. The cable bending fixture according to claim 1.   Fastening of a cable in which a flexible flat high-frequency cable (P) for high-speed transmission is fixed to a mounting frame (F) by the cable bending fixture (10, 20, 30, 40) according to any one of claims 1 to 6. Construction.

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