JP4515242B2 - Printed circuit board having cable portion and manufacturing method thereof - 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 by mounting electronic components, but in many cases, three-dimensional component mounting is required in order to realize a compact device. For this purpose, a measure for bending the printed circuit board is required.

  Therefore, a multilayer flexible printed board having both a component mounting portion (a portion requiring thickness) and a flexible portion (cable portion) is provided. If such a board is used, space can be used effectively by folding and bending at a flexible part after component mounting to achieve compactness.

  Here, the flexible printed circuit board has a hinge structure such as a notebook personal computer or a foldable mobile phone, and is often used for a portion that is frequently opened and closed. In this case, as described in Patent Document 1, a cable portion is spirally wound and stored in a hinge portion. Recently, as described in Patent Document 2, a hinge part structure corresponding to a complicated movement is also shown. For this reason, a more flexible cable part structure is required.

  The cable portion is made of a single-sided material rather than a double-sided material, so that the amount of bending required for bending is smaller. For this reason, Patent Document 3 discloses that when the wiring density is high, a single-sided material having better flexibility has a two-layer structure and the space between them is relieved to reduce the bending stress of the cable portion. 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 single-side flexible board having two sheets as shown in FIG. 11, the cable lengths at the inside and outside of the bent portion are the same as shown in FIG. 11 (a). . When the cable is spirally wound as shown in FIG. 11B, the inner cable is constrained by the outer cable and the cable is complicatedly bent. If opening and closing is repeated in this state, problems such as poor insulation and disconnection occur due to rubbing between the cables. As described in Patent Document 4, there is a structure in which a cable is wound around a cylindrical support member, but there are cases where the operation of the cable is hindered.

  Therefore, as shown in Patent Document 5, if a structure for suppressing the rigidity of the cable is provided so that the specific part of the cable on the inside can be bent, and this is brought out of the hinge part, Rub can be eliminated. However, the method of providing a portion for suppressing the rigidity has a defect 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.

Alternatively, as shown in Patent Document 6, it is also effective to take one of the two-layered cable long, but the bent portion moves due to complicated bending inside the hinge structure, and the cables are also rubbed. May cause problems such as poor insulation and disconnection.
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

  The present invention relates to a printed circuit board in which a plurality of single-sided flexible boards have a cable portion with a cable portion, and an inner cable and an outer cable do not cause defects such as insulation failure or disconnection due to the rubbing of the cables. The purpose is to provide.

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 crease is formed at a specific position of the cable which is inside when the hinge is bent in the cable portion, so as to bend by a length that is flat but bent when bent. Printed circuit board, characterized by
And 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 formed of a single-sided flexible board and is bent by two or more layers. In the manufacturing method of the printed circuit board including the cable of
The cable portion formed as the one-sided flexible substrate, at the specific position of the cable that is inside when the hinge is bent, an ear-shaped protruding portion protruding in the width direction of the cable is formed,
A method of manufacturing a printed circuit board, characterized in that a crease is formed in the ear-like overhanging portion to be bent by a length that is flat but bent when bent before being spirally wound,
And 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 is bent over two or more layers In the manufacturing method of the printed circuit board including the cable of
The cable portion formed as the single-sided flexible substrate is flat at a specific position of the cable that is inside when the hinge is bent , and is only flat enough to bend when bent , although it is flat before being spirally wound. Pre-form folds to bend,
Next , the printed circuit board manufacturing method, wherein the cable part in which the crease is formed is laminated with another cable part ,
Is to provide.

  As described above, according to the present invention, a double-layer structure of single-sided materials is used, and by hollowing the space between them, the bending stress of the cable portion is relieved so that the inner cable is bent between the hinge bending portion and the component mounting portion. It is possible to consolidate, and it is possible to greatly reduce problems such as insulation failure and disconnection caused by rubbing between cables in the hinge bend.

According to the present invention, in a printed circuit board using a cable having a structure in which a plurality of single-sided flexible boards are stacked , the bending is fixed to a specific portion of the cable on the inner side in a state before being spirally wound but is bent. Such a structure is to prevent rubbing between the inner and outer cables.

  If the thin board that constitutes the cable is made of multiple sheets of single-sided material, and the structure is such that the cable is bent and fixed between the hinge bent part of the cable and the component mounting part, the cable will be bent by the hinge. It does not extend into the bent portion, and it is possible to suppress complicated bending. For giving such a structure, there is a method as shown in FIGS.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 shows a configuration of Embodiment 1 of the present invention, in which two component mounting portions 101 and 102 are connected by a cable portion 200. Fig. 1 (a) is a plan view showing the inner layer material that becomes the inner side when spirally wound, and Fig. 1 (b) is a bottom view showing the inner layer material that becomes the outer side. It has been given. FIG. 1C is a side sectional view showing a state after lamination.

  In FIG. 1, two layers of inner layer materials 11 and 12 composed of a single-sided flexible substrate including a cable portion and an outer layer material 3 are laminated by a laminating adhesive (or prepreg) 2 to form a printed circuit board having a four-layer structure. ing.

  In the inner layer material on the inner side of FIG. 1A, folds al, a2, b1, and b2 are formed between the hinge bent portion 200A and the component mounting portion 101. The folds a1 and a2 are valley folds when viewed from above, and the folds bl and b2 are mountain folds when viewed from above. As a result, a crank-like deflection protruding upward is formed.

  FIG. 2 shows a state of bending formed in a crank shape by two mountain folds b1 and b2 between the two valley folds a1 and a2 in FIG. 1 when the cable is wound in a spiral shape. Bending is formed by folds a1, b1, b2, and a2 previously applied to the inner cable, and further, the folds a1, b1, b2, and a2 have a function of fixing the bending between the hinge bending portion 200A and the component mounting portion 101. have.

  FIG. 3 shows a method of making a crease shown in the first embodiment. The crease blade 4 is formed of a metal such as SUS having a linear tip shape that is thin enough not to be cut even when a thin substrate constituting the cable is pressed. The crease blade presser 5 disposed on the opposite side across the inner layer material 11 is made of a rubber-like elastic body and receives the crease blade 4. A crease can be made by inserting the inner layer material 11 between them and pressing it from above. Incidentally, a valley fold is formed in FIG. 3 (a) when viewed from above, and a mountain fold is formed in FIG. 3 (b).

  4 and 5 show the configuration of the second embodiment of the present invention. Here, FIGS. 4A to 4D are schematic views of the inner layer material including the cable portion, respectively, as in FIG. As shown in FIG. 4D, the cable portion has a three-layer structure including three cables 13, 14, and 15.

  FIG. 5 shows a state in which the three inner layer materials and the two outer layer materials are used to form a five-layer substrate, and the cable portion is spirally wound. As in FIG. 2, if the cable portion 13, 14, 15 is wound in a spiral shape and the inner cable becomes larger, the number of thin substrates constituting the cable can be arbitrarily set. Can be set.

  FIG. 6 shows a third embodiment of the present invention. When the cable 16 is wound in a coil shape as shown in FIG. 6 (b), the shape of the cable portion is usually a crank shape as shown in FIG. 6 (a). Even in this case, if a crease is formed at a position that does not reach the coiled bent portion in the same manner as in FIG. 1, the fold can be fixed at a position at which the bending does not apply to the bent portion.

  When the coiled state is viewed from the side, as shown in FIG. 6 (c), the end connected to the component mounting portion 102 is pulled out without intersecting the coiled portion.

  7 (a) to 7 (d) show a fourth embodiment of the present invention. FIG. 7 (a) is a plan view, FIG. 7 (b) is a bottom view, and FIG. 7 (c) is a side sectional view. It is. In each of the above Examples 1 to 3, both the mountain fold and the valley fold were set at two places, and when the cable part was bent, the cable part bent shape formed a substantially trapezoid when viewed from the side. FIG. 7 is an example in which a bending bend is applied at one mountain break.

  For this reason, as shown in FIG. 7 (d), the cable is bent by the fold line b1 and the curved portions a1 and a2 that are connected to the fold line b1 and arranged on both sides thereof. Absorbs excess length.

  FIG. 8 shows a fifth embodiment of the present invention, FIG. 8 (a) is a plan view, FIG. 8 (b) is a bottom view, and FIG. 8 (c) is a side sectional view. And when FIG. 8 (d) looks at Example 5 from the side, a cable part bending shape forms a substantially semicircle between two valley folds.

  In other words, arc-shaped deflections connected to the folds a1 and a2 are formed, and the remainder of the length of the inner layer material that is inside is absorbed by the depth of the arc-shaped deflection.

  FIG. 9 shows Embodiment 6 of the present invention, FIG. 9 (a) is a plan view, FIG. 9 (b) is a bottom view, and FIG. 9 (c) is a side sectional view. FIG. 9D shows that when the embodiment 6 is viewed from the side, the cable portion bending shape forms a substantially triangular shape at two valley folds and one mountain fold. These bending shapes can also be selected depending on the shape of the cable portion.

  In each of Examples 1 to 6 described above, the inner layer material that is on the inner side is laminated in a state in which creases are made in advance before lamination, but it is necessary to make a crease in the final process of printed circuit board manufacturing. The shape shown in FIG. 10 may be used. 10A is a plan view, FIG. 10B is a bottom view, and FIG. 10C is a side sectional view.

  In this Example 7, as shown in FIG. 10 (a), an ear-like overhanging portion 6 is formed at a portion where a crease is formed in the inner layer material that is inside. If the folds a1 and a2 are put in the ear-like overhanging portion 6 in the final process of manufacturing the printed circuit board, the same bent shape as in other examples 1 to 6 can be obtained.

  In other words, in the example of FIG. 10, the cable part bending shape is formed in a substantially semicircular shape when viewed from the side at the valley folds a <b> 1 and a <b> 2 provided at two locations, but the combination of the above-described mountain folds and valley folds Then, each bending shape can be obtained.

  In order to maintain the crease, it is preferable to leave the copper foil in the overhanging portion 6 and to have a certain degree of hardness.

1A and 1B show the configuration of Embodiment 1 of the present invention. FIG. 1A is a plan view, FIG. 1B is a bottom view, and FIG. 1C is a cross-sectional view showing a state after lamination. 2 is a side cross-sectional view showing a state where the cable portion is spirally wound according to the first embodiment shown in FIG. FIG. 3 is an explanatory diagram illustrating the principle of crease according to the first embodiment. FIG. 4 shows a second embodiment of the present invention. FIG. 4 (a) is a plan view, FIG. 4 (b) is a bottom view, FIG. 4 (c) is a side sectional view, and FIG. The sectional side view which shows a back state. FIG. 5 is a side sectional view showing a state in which the cable portion is spirally wound according to the second embodiment of the present invention. FIG. 6 shows a third embodiment of the present invention, FIG. 6 (a) is a top view when unfolded, FIG. 6 (b) is a plan view showing a bent state in a coil shape, and FIG. ) Is a cross-sectional view taken along line AA in FIG. 7 shows a fourth embodiment of the present invention, FIG. 7 (a) is a plan view, FIG. 7 (b) is a bottom view, and FIG. 7 (c) is a side sectional view showing a state after lamination. 7 (d) is a side sectional view showing a state in which the cable portion is spirally wound. FIG. 8 shows Embodiment 5 of the present invention, FIG. 8 (a) is a plan view, FIG. 8 (b) is a bottom view, and FIG. 8 (c) is a side sectional view showing a state after lamination. 8 (d) is a side sectional view showing a state in which the cable portion is spirally wound. 9A and 9B show Embodiment 6 of the present invention. FIG. 9A is a plan view showing a cable that is inside when spirally wound, and FIG. 9B is a plan view showing a cable that is outside. FIG. 9 (c) is a side sectional view showing a state after lamination, and FIG. 9 (d) is a side sectional view showing a state in which the cable portion is wound in a spiral shape. FIG. 10 shows the configuration of Example 7 of the present invention. FIG. 10 (a) is a plan view, FIG. 10 (b) is a bottom view, and FIG. 10 (c) is a sectional side view showing a state after lamination. FIG. 10 (d) is a side sectional view showing a state where the cable portion is spirally wound. FIG. 11 is a cross-sectional view of a state in which a conventional single-sided flexible board two-layer cable is used, and the cable portion is spirally wound and housed in the hinge portion in a state where nothing is applied to the inner cable. 11 (a) is a side sectional view showing a state before the cable portion is wound in a spiral shape, and FIG. 11 (b) is a side sectional view showing a state after the cable portion is wound in a spiral shape.

Explanation of symbols

11, 12, 13, 14, 15, 16 Inner layer material and cable part,
2 Laminated adhesive or prepreg, 3 outer layer material, 4 crease blade,
5 Folded blade receiving part, 101, 102 Component mounting part, 200 Cable part,
200A Bent part.

Claims (6)

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 crease is formed at a specific position of the cable which is inside when the hinge is bent in the cable portion, so as to bend by a length that is flat but bent when bent. A printed circuit board characterized by that. The printed circuit board according to claim 1,
A printed circuit board, wherein a plurality of the folds are provided at predetermined intervals. The printed circuit board according to claim 2,
In order to form a crank-like bend in the cable, two folds in opposite directions are arranged along the longitudinal direction of the cable with two folds in the same direction sandwiched between the folds. Printed board. The printed circuit board according to claim 1,
Wherein the deflection, the printed circuit board, characterized in that it is constituted by a curved portion continuous to said fold line and said fold line. 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 method for manufacturing a printed circuit board including a cable,
The cable portion formed as the one-sided flexible substrate, at the specific position of the cable that is inside when the hinge is bent, an ear-shaped protruding portion protruding in the width direction of the cable is formed,
A method of manufacturing a printed circuit board, comprising: forming a crease in the ear-like overhanging portion so as to bend by a length that is flat but bent when bent before being spirally wound. 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 method for manufacturing a printed circuit board including a cable,
The cable portion formed as the single-sided flexible substrate is flat at a specific position of the cable that is inside when the hinge is bent , and is only flat enough to bend when bent , although it is flat before being spirally wound. Pre-form folds to bend,
Next, the cable part having the crease formed thereon is laminated with another cable part .

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