JP4558516B2 - Printed board - Google Patents

Description

The present invention relates to a printed circuit board used in an electronic apparatus, and more particularly to a multilayer flexible printed circuit board having a cable portion composed of a plurality of cables connected to a component mounting portion.

  A printed circuit board is mounted on a device with electronic components mounted, but in many cases it is necessary to mount a three-dimensional component in order to realize a compact device. For this reason, a measure such as bending the printed circuit board is required. Is required.

  In view of this, a multilayer flexible printed board having both a component mounting portion (a portion requiring thickness) and a flexible portion (cable portion) is provided. By using such a substrate, space can be effectively utilized and compactness can be achieved by bending and arranging the flexible portions after component mounting.

  In addition, the flexible printed circuit board is often used in a part having a hinge structure such as a notebook personal computer and a foldable mobile phone, which frequently repeats opening and closing. In this case, as described in Patent Document 1, a cable part is spirally wound and stored in a hinge part. In addition, recently, as described in Patent Document 2, a hinge part structure corresponding to complicated and three-dimensional movement is also provided. For this reason, a more flexible cable part structure is required.

  Usually, the force required for bending is smaller when the single-sided material is the cable part than the double-sided material. For this reason, as shown in Patent Document 3, when the wiring density is high, a single-sided material having better flexibility is made into a two-layer structure, and the space between them is made hollow to relieve the bending stress of the cable portion. It has been broken.

This method is effective, but complicated bending inside the hinge structure may hinder opening and closing. For example, assuming a four-layer board of a cable having a two-sided single-sided flexible board structure having component mounting parts 101 and 102 and a cable part 200 as shown in FIG. 29 , the bent portion as shown in FIG. The cable length is the same between the inside and the outside. If the cable is wound spirally as shown in FIG. 29 (b), there is a drawback that the inner cable is constrained by the outer cable and bends in a complicated manner.

  If opening and closing is repeated in this state, problems such as poor insulation and disconnection may occur due to rubbing between the cables. Although there is a structure in which a cylindrical support member is wound around a cable as in Patent Document 4, there are cases where the operation of the cable is hindered.

  Therefore, as shown in Patent Document 5, if the cable is provided with a portion that suppresses the rigidity of the cable so that it can bend at a specific portion of the cable that is on the inside, and this is brought out of the hinge portion, the cables are connected to each other. It becomes possible to eliminate the rubbing. However, the method of providing the portion for suppressing the rigidity has a drawback that the wiring density is restricted, such as the cutout of the cable itself, the cutout of the coverlay, and the regulation of the pattern width.

Furthermore, as shown in Patent Document 6, it is also effective to take one of the two-layered cable long, but due to a complicated bend inside the hinge structure, the bent portion moves, and again due to the rubbing between the cables. In some cases, defects such as insulation failure or disconnection may occur.
JP-A-6-31216 JP 2003-133664 A Japanese Patent Laid-Open No. 7-312469 JP 2003-258388 A JP2003-101165A JP 2003-133733 A

  As described above, in the conventional flexible printed circuit board, when a printed circuit board having a cable portion with a structure in which a plurality of single-sided flexible boards are stacked is used for a hinge bending portion, the inner cable is restrained by the outer cable. And has a drawback of complicated bending.

In the present invention, when a printed circuit board having a cable portion having a structure in which a plurality of single-sided flexible boards are stacked is used for a hinge bending portion, the inner cable is constrained by the outer cable and bent in a complicated manner, and the cables are rubbed. As a result, an object of the present invention is to provide a printed circuit board that does not cause defects such as defective insulation or disconnection.

In order to achieve the above object, in the present invention,
A printed circuit board having a plurality of component mounting parts and a cable part for connecting the component mounting parts, wherein each of the cable parts of the printed circuit board is composed of a single-sided flexible board and has two or more layers that are hinge-bent. In a printed circuit board including a cable, a portion of the cable that is not bent when the hinge is bent is bent outside by a length that is bent when the hinge is bent. A printed circuit board characterized by providing means for fixing the cables to each other ;
Is to provide.

  As described above, the present invention is a cable made of a plurality of single-sided materials that are not constrained to each other, and when the hinge is bent, the bending of the inner cable is concentrated at a position between the hinge bent portion and the component mounting portion. As a result, problems such as poor insulation and disconnection caused by rubbing between the cables in the hinge bent portion can be largely eliminated.

  In addition, the cable part connecting between the component mounting parts is fixed by bending, and the outer frame part of the printed circuit board is shortened by the amount of bending, so that the cable part has a cable part provided with bending. The printed circuit board can be easily manufactured in a form that can be shipped in a bent state.

  The present invention has a cable structure in which a plurality of thin single-sided boards are stacked, and a structure in which the position between the hinge bent portion and the component mounting portion of the cable on the inner side is fixed and fixed is provided. The cable is not bent in the hinge bent portion, and the complicated bending can be suppressed.

Hereinafter, an embodiment of the present invention with reference to FIG. 28 Figures 1.

FIG. 1 shows Embodiment 1 of the present invention. FIG. 1 (a) is a plan view and FIG. 1 (b) is a side sectional view.
The first embodiment is configured as a printed circuit board having a structure in which the component mounting portions 101 and 102 are connected by a two-layered cable 200. The component mounting portions 101 and 102 are formed by laminating two layers of the single-sided material 1 to each other. It is configured as a four-layer substrate laminated with an outer layer material 3 by an agent or a prepreg (hereinafter referred to as a laminating adhesive together) 2.

  At the stage before this printed circuit board is laminated, the double-sided tape 4 is attached to either of the two cables facing each other at a position between the hinge bent portion and the component mounting portion of the cable 200. deep. At this time, the release film on the opposite side of the adhesive surface in the double-sided tape 4 is left as it is.

After the predetermined printed circuit board manufacturing process is performed, the inner cable is shifted by an amount corresponding to the length of bending when it is spirally wound, and then the release film of the double-sided tape 4 is peeled off at a position B in FIG. Fix it. As a result, the bending generated in the cable that is the inner side of the two-ply cable is fixed.

  FIG. 2 shows a state in which a deflection is formed. The double-sided tape is not particularly limited as long as it has an adhesive strength capable of bonding cables, but it is preferable that the thickness before peeling the release film is thinner than the clearance between the cables. If it is thick, there is a concern of adding an extra load to the cable during lamination. With the structure of FIG. 2, the bent portion C is fixed between the hinge bent portion and the component mounting portion.

  FIG. 3 shows a second embodiment of the present invention, which has a structure of three cables for connecting component mounting portions. 3A is a plan view and FIG. 3B is a side sectional view. A larger deflection is made in the order of the inner cable and the central cable, and the three cables are fixed to each other by the double-sided tape 4 at the B position. FIG. 3C shows this state. As shown in this example, the number of thin substrates that make up the cable can be set arbitrarily if the cable that is on the inner side when the cable is wound spirally around the hinge bend is fixed with greater deflection. Can do.

  FIG. 4 shows a third embodiment of the present invention. When the cable 11 is wound in a coil shape at the hinge bent portion as shown in FIG. 4B, the planar shape of the cable portion is usually a crank shape as shown in FIG. And the connection part with the component mounting parts 101 and 102 of the cable 200 is pulled out in the direction orthogonal to the part which forms bending.

In the case of the first embodiment shown in FIG. 1, the bending may be fixed at a position between the hinge bent portion and the component mounting portion. In the case of FIG. Need to be fixed.
At this time, as shown in FIG. 4 (c), two fixing points 41 and 42 by the double-sided tape are set, and the deflection is fixed between the two solid points.

5 shows a fourth embodiment of the present invention, FIG. 5 (a), (b) each show a schematic view of an inner layer material containing a cable portion 200. In FIG. 5 , reference numeral 1 denotes a cable portion 200 that connects the component mounting portions 101 and 102, and pattern formation and coverlay lamination are performed in advance. Here, FIG. 5 (a) shows the inner layer material to become inwardly when winding the cable portion 200 to the spiral, FIG. 5 (b) shows the inner layer material on the outside.

5 (a) and 5 (b), the cable portion 1 has an ear-like protrusion 5, and a grommet hole 6 is opened at the center thereof. The position of the eyelet hole 6 is set so as to be between the hinge bent part 200A and the component mounting part 101 when the cable part 200 is wound in a spiral shape, and is further positioned by a length L corresponding to the bending. Is off. The periphery of the cable part 200 is punched into such a shape.

Figure 6 is a four-layer board with a lining material of Figure 5, a further state of the cable portion 200 spiral wound, FIG. 7 is a schematic view enlarging a B portion of FIG. FIG. 5 (a), according to the position of the eyelet holes 6 installed in the cable section 1 (b), it is secured by eyelet Dakoma 61. By doing so, the bent portion C is fixed between the hinge bent portion 200 </ b> A and the component mounting portion 101.

As the eyelet hitting piece 61, for example, one shown in Utility Model Registration No. 3040270 can be used. Moreover, you may fix with a screw nut instead of an eyelet hitting piece. Further, the eyelet hole 6 can be used as a fixing hole to an electronic device to be mounted, and may be used as an earth land from the ground layer.

FIG. 8 shows an example of the ear-like protrusion 5 when used as an earth land from the ground layer. Here, ground patterns 71 are arranged on both sides of the wiring pattern 72. The ground pattern 71 projects over the part of the ear-like protrusion 5, and the eyelet hole 6 passes therethrough. Further, a portion D indicated by a broken line is a portion where there is no cover lay. Here, when a screw-nut or the like is inserted, conduction is obtained. Of course, after fixing with the eyelet punching piece 61, a screw-nut or the like may be inserted.

FIG. 9 and FIG. 10 show an embodiment 5 , that is, an embodiment in which the structure of FIGS. 5 to 7 is applied to an inner layer material having a three-layer structure. Here, FIG. 9 (a), (b) , (c) is a schematic view of an inner layer material also including cable portions, respectively Figure 5. FIG. 10 shows a state in which these three inner layer materials are used to form a five-layer substrate, and the cable portion is further spirally wound.

As with FIG. 6, to align the eyelet holes 6 installed in the cable section 1, and is fixed with eyelet Dakoma 61. If the length L corresponding to the bending of the cable that becomes the inner side when the cable 1 is spirally wound is increased, the number of thin substrates constituting the cable can be arbitrarily set.

11 , 12 and 13 show a sixth embodiment of the present invention. Instead of Example 4 eyelet hole 61 in FIG. 5 showing a, as shown in FIG. 11 (a), the cable comprising inwardly when spirally wound non-through-hole 91, FIG. 11 (b ), Pads 92 are respectively formed on the outer cables. The inner cable is shifted by a length L that forms the bent portion C, and soldered and fixed when the positions of the non-through hole 91 and the pad 92 are aligned. Figure 12 is a state of being fixed, FIG. 13 shows respectively a section along the line E-E in FIG. 12.

  Alternatively, a solder bump may be formed on the pad 92 in advance, and the soldering may be performed by applying a heating probe when the positions of the non-through hole 91 and the pad 92 are aligned.

FIG. 14 shows a schematic diagram of Embodiment 7 of the present invention. FIG. 14 is a side sectional view, and two inner layer materials 11 and 12 made of a single-sided flexible substrate including the cable portion 200 and outer layer materials 31 and 32 are laminated by the laminating adhesive 2 to form a four-layer printed board. Is formed.

  The outer layer material 32 that becomes the outer side when the cable portion 200 is spirally wound has a protruding portion 33 formed in the direction in which the cable is drawn, and the cable 12 that becomes the outer side is formed on the protruding portion 33 by the laminated adhesive 2. It is fixed. On the other hand, the inner cable 11 is not fixed in the section of the overhang portion 33 and is in a hollow state.

By the length of the flexure when spirally wound, it is fixed by fixing means 4 to shifting cable 11 comprising an inner. By doing so, the bent portion C is fixed between the hinge bent portion and the component mounting portion.

FIG. 15 is a side sectional view showing a state in which the cable 11 which is bent and hinged is shifted and fixed by the fixing means 4. As the fixing means, as shown in the fourth embodiment, the cable 11 is provided with an ear-shaped protrusion, and an eyelet hole is opened at the center portion thereof, and an eyelet hole is also opened at a predetermined position of the overhang portion 33. A method of fixing with a hitting piece is employed.

FIG. 16 shows an example in which Example 8 of the present invention, that is, Example 7 shown in FIGS. 14 and 15 , is applied to an inner layer material having a three-layer structure. Here, the cable 200 for connecting the component mounting parts 101 and 102 has a three-sheet structure. 16 (a) is a plan view, FIG. 16 (b) is a side sectional view, and FIG. 16 (c) is a side sectional view when spirally wound and fixed by fixing means 4, respectively. The inner cable 13 and the central cable 12 are made to bend in the order, and are fixed by the fixing means 4 at a predetermined position of the overhang portion 33 . As in this example, when the cable 200 is spirally wound and the cable that is on the inner side is fixed with a larger deflection, the number of thin substrates constituting the cable can be arbitrarily set.

FIG. 17 shows Embodiment 9 of the present invention. When the overhang portion cannot be formed in the direction in which the cable is pulled out using the outer layer material 32 as in the embodiment 7 shown in FIG. 14 , the layer constituent portion corresponding to the overhang portion 33 in FIG. The mounting part 101 is notched and the notch part 34 is set. And if it fixes to the eyelet hole of B with an eyelet piece , the structure similar to Example 7 of FIG. 14 , FIG. 15 will be obtained.
In addition, the method of shifting and fixing the cable 11 up to the ninth embodiment may be a method of fixing with a screw-nut instead of the eyelet hitting piece as described in the description of the sixth embodiment, and fixing with a string-like member. It may be a method. Further, in place of the eyelet holes in the description of the sixth embodiment, the length that forms the bent portion C by forming the non-through hole 91 in the inner cable and the pad 92 in the outer cable, respectively. Any method of fixing by performing soldering at a position where the positions of the non-through hole 91 and the pad 92 are aligned can be adopted.

18 and 19 show Embodiment 10 of the present invention. In place of the eyelet hole 6 in FIG. 5 , as shown in FIG. 18 (a), a semicircular cut 81 is shown in the cable that becomes the inner side when wound spirally, as shown in FIG. 18 (b). In this way, a straight cut 82 is made in the outer cable. The cut 81 and the cut 82 are shifted by a length L.

FIG. 19 shows a state where the semicircular cut 81 is inserted into the linear cut 82. By doing so, similarly to FIG. 6, flexure C is secured between the hinge bending part and the part mounting section. It is preferable that the semicircular cut 81 is installed toward the hinge side, and the straight cut 82 is installed at a right angle to the cable because it is best fixed.

Reference example 1

A multilayer flexible printed circuit board having a cable part provided with a bend so that the cable part connecting the component mounting parts is provided with a bend and the outer frame part of the printed circuit board is shortened by the bend. It is preferable for the subsequent component mounting to be in a form that can be shipped in a bent state. Examples of reducing the outer frame portion of the printed circuit board by the amount of bending are shown in Reference Examples 1 to 5 below.

FIG. 20 shows Reference Example 1 of the present invention. The reference example 1 is a printed circuit board having a cable portion having a structure in which the second and third layers of the four-layer substrate have a two-sided structure of single-sided material, and the bending stress of the cable portion is relieved by making a space between them. . In addition, the printed circuit board which has a cable part is applicable other than the 4 layer structure shown here, and is not limited to this layer structure.

First in FIG. 21 (a), the outer frame portion 301 corresponding to the planned portion 41 for fixing the deflection, cutting the length of the minute flexing. Next, as shown in FIG. 22 , the fixing base material 31 is bonded to the both side portions 9 via the laminated adhesive 21. FIG. 22 shows a CC cross section in FIG. 22 (b) in the bonded state.

And in FIG. 22 , although the fixed base material 31 is bonded on both surfaces via the lamination | stacking adhesive agent 21, it may be single-sided. The fixing base material 31 is not particularly limited as long as it is an insulating material and has a strength capable of maintaining the flatness of the printed circuit board. A glass woven epoxy resin laminate or a glass mat base unsaturated polyester resin laminate is recommended.

Reference example 2

FIGS. 23A to 23C show another reference example 12 in which the cable portion connecting the component mounting portions is shortened by the amount of bending . This Reference Example 2 is appropriate when the thickness of the fixed base material 31 in Reference Example 1 cannot be projected.

First, in FIG. 21A, the outer frame portion 301 corresponding to the planned portion 41 where the bending is to be fixed is cut out by the length to be bent, as in Reference Example 1. The position of both side portions 9 in advance FIG. 22 (a), the previously formed grooves by notches of laminate material. The cross section of the groove, shown in FIG. 23 (a). As shown in FIG. 23 (b), when the fixing base material 31 corresponding to the width and depth of the groove is bonded through the laminated adhesive 21, FIG. 23 (c) is obtained. Finished top view at this time is FIG. 21 (b).

In addition, although the example which bonds a fixed base material to both surfaces is shown in FIG. 23 , as long as the intensity | strength which can maintain flatness is ensured, it may bond only one side.

Reference example 3

24A and 24B are explanatory views showing Reference Example 3. FIG. First in FIG. 20 (a), the outer frame portion 301 corresponding to the planned portion 41 for fixing the deflection, punched by the length of the minute flexing. The shape 302 of the punching portion at this time is shown in FIG. 24 (b).

Then, were allowed to once isolated as the outer frame part 400 by punching the punching portion 302, when fitting the irregularities, the state shown in FIG. 24 (b). In addition, you may combine with the reference example 1 and the reference example 2 in order to ensure intensity | strength.

Reference example 4

25A and 25B are explanatory diagrams of Reference Example 4. FIG. In this reference example 4, the width of the outer frame portion 301 which is shorter by punching is a reference example in which insufficient to maintain the strength enough to fix fitted.

First, in FIG. 21A, the outer frame portion 301 corresponding to the planned portion 41 where the bending is fixed is cut by the length to be bent in the same manner as in the first reference example . Furthermore, the position of both side portions 9 of FIG. 21 (a), the punched out punching portion 303, such as FIG. 25 (a), the fitting the irregularities were allowed to separate as the outer frame part 400.

In FIG. 25 , the outer frame component 401 uses a material arranged in the immediate vicinity of the outer frame components 402 and 403. However, the outer frame component 401 is manufactured and used with another material having the same layer configuration. May be. Further, in order to ensure the strength, it may be combined with Reference Example 1 or Reference Example 2 .

Reference Example 5

FIGS. 26A and 26B are explanatory diagrams of Reference Example 5. FIG. First, in FIG. 20A, a groove as shown in FIG. 26A is formed in advance in the cross section along the FF line of the outer frame portion 301 corresponding to the planned location 41 where the deflection is to be fixed, by a notch of the laminated material. Keep it. FIG. 26 (b) is a top view thereof.

First separated by punching a portion G in FIG. 27 (a), the then when bonded through the laminating adhesive 21 combined groove bottom as shown in FIG. 28 (a), a side shown in FIG. 28 (b) Structure It becomes.
FIG. 28 (c) is a top view thereof.

1A and 1B show a configuration of a first embodiment of the present invention, in which FIG. 1A is a plan view and FIG. 1B is a side sectional view. FIG. 2 is a side sectional view showing a state where the cable portion of FIG. 1 is spirally wound and the bending is fixed. 3 shows the configuration of the second embodiment of the present invention, FIG. 3 (a) is a plan view, FIG. 3 (b) is a side sectional view, and FIG. 3 (c) is a spiral of the cable portion of FIG. 3 (a). Side sectional drawing which shows the state which wound in the shape and fixed the bending. FIG. 4 shows the configuration of the third embodiment of the present invention, FIG. 4 (a) is a plan view when unfolded, FIG. 4 (b) is a plan view showing a coil bent state, and FIG. 4 (c) is a plan view. The sectional side view which follows the AA line in FIG.4 (b). 5 shows a configuration of a fourth embodiment of the present invention, the cable to be inside when wound in FIG. 5 (a) spiral, and FIG. 5 (b) is a plan view showing a cable on the outside. FIG. 6 is a side sectional view showing a state in which the inner layer material of FIG. 5 is used to form a four-layer structure and the cable portion is spirally wound. Figure 7 is a schematic view magnifying the B portion of FIG. FIG. 8 is a plan view showing an embodiment when the ear-like projection of the present invention is used as a land for grounding from a ground layer. FIG. 9 shows a fifth embodiment of the present invention, shows a schematic diagram of an inner layer material including a cable portion based on the present invention, and FIG. 9 (a) shows a cable that becomes an inner side when wound spirally. 9 (b) is a plan view showing a cable that is in the center, and FIG. 9 (c) is a plan view showing a cable that is on the outside. FIG. 10 is a side sectional view showing a state in which the inner layer material of FIG. 9 is used to form a five-layer board and the cable portion is wound in a spiral shape. Figure 11 shows the configuration of a sixth embodiment of the present invention, FIG. 11 (a) the cable to be inside when spirally wound, and FIG. 11 (b) is a plan view showing a cable on the outside, respectively. 12, FIG. 11 (a), the schematic view of mounting the cable shown in (b). Figure 13 is a sectional view taken along line E-E in FIG. 12 (b). 14A and 14B show the configuration of Embodiment 7 of the present invention, in which FIG. 14A is a plan view and FIG. 14B is a side sectional view. FIG. 15 is a side sectional view showing a state in which the inner layer material of FIG. 14 is used to form a four-layer board, and the cable portion is further spirally wound. FIG. 16 shows the configuration of the eighth embodiment of the present invention, FIG. 16 (a) is a plan view, FIG. 16 (b) is a side sectional view, and FIG. 16 (c) is a case where the cable portion is wound spirally. FIG. FIG. 17 is a plan view showing the configuration of the ninth embodiment of the present invention . Figure 18 shows the construction of the embodiment 10 of the present invention, the cable to be inside when wound in FIG. 18 (a) spiral, and FIG. 18 (b) is a plan view showing a cable on the outside. 19, FIG. 18 (a), the schematic view of mounting the cable shown in (b). Explanatory drawing which shows the structure of the reference example 1 of this invention. Explanatory drawing which shows the manufacturing process of the reference example 1 of this invention. Explanatory drawing which shows the manufacturing process of the reference example 1 of this invention. Explanatory drawing which shows the structure of the reference example 2 of this invention. Explanatory drawing which shows the structure of the reference example 3 of this invention. Explanatory drawing which shows the structure of the reference example 4 of this invention. Explanatory drawing which shows the structure of the reference example 5 of this invention. Explanatory drawing which shows the manufacturing process of the reference example 5 of this invention. Explanatory drawing which shows the manufacturing process of the reference example 5 of this invention. FIG. 29A shows a conventional cable having a two-sided single-sided flexible substrate structure, FIG. 29A shows a state before the cable portion is wound in a spiral shape, and FIG. 29B shows a state after the spiral winding.

1, 11, 12, 13, 14, 15 Inner layer material and cable part,
2,21 Laminated adhesive, 3,31,32 Outer layer material, 4,41,42 Double-sided tape,
33 Overhang, 34 Notch, 5 Ear projection, 6 Eyelet hole,
61 Eyelet hammer, 71 Ground pattern, 72 Wiring pattern,
81 semicircular cut, 82 linear cut, 101, 102 component mounting part,
200 cable part, 200A hinge bent part, 301 shortened part,
302 stamped part, 400 outer frame.

Claims (8)

A printed circuit board having a plurality of component mounting parts and a cable part for connecting the component mounting parts, wherein each of the cable parts of the printed circuit board is composed of a single-sided flexible board and has two or more layers that are hinge-bent. In printed circuit boards including cables,
A portion of the cable that is not bent when the hinge is bent is bent by a length that is bent when the hinge is bent. A printed circuit board provided with fixing means. The printed circuit board according to claim 1,
The printed circuit board , wherein the fixing means is a double-sided tape. The printed circuit board according to claim 1,
An overhang portion in which an outer layer material projects from the component mounting portion along the outer cable,
The outer cable is fixed to the projecting portion, and a bend is formed in a portion between the inner cable and the component mounting portion, and the predetermined position of the inner cable is maintained to maintain the formed bend. A printed circuit board characterized by comprising fixing means for fixing. The printed circuit board according to claim 3, wherein
A notch formed in the outer layer material of the cable that becomes the inside when the hinge is bent in the component mounting portion;
A cable which is fixed to the notch and becomes an outer side when the hinge is bent;
A cable that is connected to the component mounting part and is located at the inner side when the hinge is bent and is fixed to the notch at a position shifted by a length that is bent when the hinge is bent.
A printed circuit board characterized by having The printed circuit board according to claim 1,
The fixing means is
A cable part having an ear-shaped protrusion with a hole for eyelets in the center part;
The position of the eyelet hole in the ear projection is set to be between the hinge bent portion and the component mounting portion when the cable portion is hinge bent,
Furthermore, the position of the cable that is the inner side and the cable that is the outer side are shifted by the length of the amount of bending,
A printed circuit board characterized by aligning eyelet hole positions of the inner cable and the outer cable and fixing the eyelet. The printed circuit board according to claim 5 , wherein
A printed circuit board which is fixed by a string-like member instead of fixing the eyelet. The printed circuit board according to claim 5 , wherein
A printed circuit board characterized by being fixed with a screw-nut instead of fixing the eyelet. The printed circuit board according to claim 1,
The fixing means has an ear projection on each of the inner cable and the outer cable, and the inner cable ear projection has a semicircular cut-out at the center thereof, and the outer cable The lug has a straight cut at the center, and the cut position is set so that it is between the hinge bent part and the component mounting part when the hinge is bent. The printed circuit board is characterized in that the position of the inner cable and the outer cable are shifted by a length of λ and the semicircular cut is inserted into the linear cut.

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