JP2005039052A - Flex-rigid wiring board and installation method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flex-rigid wiring board the flexible performance of a flexible wiring board of which is excellent and an installation method thereof. <P>SOLUTION: The flex-rigid wiring board A is configured to include a flexible wiring board 1 wherein a prescribed conductor path 12 is formed to at least one of front and rear sides of an insulation film 11 with flexibility, and a rigid wiring board 4 wherein the flexible wiring board 1 is sandwiched between first and second hard boards 41, 42 and fixed via an adhesive 3. A step difference 43 is provided to at least part of the circumferential edge of the rigid wiring board 4, and the flexible wiring board 1 is extracted from a region wherein the step difference 43 is formed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  A flexible wiring board having a predetermined conductive path formed on at least one surface of the front and back surfaces of the flexible insulating film, and sandwiching the flexible wiring board between the first hard substrate and the second hard substrate The present invention relates to a flex-rigid wiring board comprising a rigid wiring board fixed through an adhesive, and a method for arranging the same.

In recent years, electronic devices such as mobile phones, portable terminals, and remote control devices (remote controllers) for air conditioning control devices have been required to be miniaturized, and electronic components including chip components in the electronic devices are arranged in a stable state. Therefore, there is a demand for a circuit board that effectively arranges a circuit configuration of the electronic component in a limited arrangement space. As such a circuit board, a flex-rigid wiring board has been proposed, and disclosed in, for example, Patent Document 1 and Patent Document 2.
JP-A-5-275814 JP-A-6-177490

  As shown in FIGS. 3 to 5, the flex-rigid wiring board A includes a flexible wiring board 1 in which a predetermined conductive path 12 is formed in a flexible insulating film 11, and the flexible wiring board 1 as a first. A rigid wiring board 2 is provided which is sandwiched between the hard substrate 21 and the second hard substrate 22 and fixed via, for example, a polyimide-based adhesive 3. The flex rigid wiring board A has a configuration in which rigid wiring boards 2 are provided at both ends of the flexible wiring board 1 in the drawing. Such a flex-rigid wiring board A stably arranges electronic components (not shown) on the rigid wiring board 2 and bends the flexible wiring board 1 as shown in FIGS. 2 can be routed in a stacked state.

  The flex rigid wiring board A is used for bonding the first hard wiring board 21, the flexible wiring board 1, and the second hard board 22 at the end 2a of the rigid board 2 from which the flexible wiring board 1 is drawn. Since the fillet-like surplus adhesive 3a made of the adhesive 3 is generated in the manufacturing process and the adhesiveness between the adhesive 3 containing the surplus adhesive 3a and the flexible wiring board 1 is good, the flexible wiring board 1 When a predetermined vibration is repeatedly applied in a state where the end portion 2a of the rigid wiring board 2 is bent in a predetermined direction, a portion where the excess adhesive 3a is formed in the extending direction (the first hard substrate 21 in FIG. 4). Stress is applied to the surplus adhesive 3 a) formed on the end portion 2 a, and a crack is generated in the flexible wiring board 1 together with the surplus adhesive 3 a, and the conductive path 12 of the flexible wiring board 1. Has a problem that results in cleavage.

  Therefore, the present invention has been made paying attention to the above-mentioned problems, and even when it is disposed in a severe environment where repeated vibration is applied, cracks are generated in the bent portion of the flexible wiring board. The present invention provides a flex-rigid wiring board that is excellent in the flexibility of the flexible wiring board and a method for arranging the same.

  In order to solve the above-mentioned problems, the present invention provides a flexible wiring board in which a predetermined conductive path is formed on at least one of the front and back surfaces of a flexible insulating film. A rigid wiring board comprising: a flexible wiring board sandwiched between a first hard board and a second hard board and fixed via an adhesive; and A step portion is provided at the periphery of the rigid wiring board, and the flexible wiring board is drawn out from a region where the step portion is formed.

  The flex-rigid wiring board according to claim 2 is the flex-rigid wiring board according to claim 1, wherein the end of one hard board is disposed in a state of being recessed from the end of the other hard board. Thus, the step portion is configured.

  According to a third aspect of the present invention, there is provided the flexible wiring board according to the second aspect, wherein the flexible wiring board drawn out from the step portion has a protruding end portion that is not recessed. It is bent toward the installation direction.

  According to a fourth aspect of the present invention, there is provided a flexible rigid wiring board comprising: a flexible wiring board in which a predetermined conductive path is formed on at least one of the front and back surfaces of a flexible insulating film; and the flexible wiring board. A rigid wiring board comprising a rigid wiring board sandwiched between two hard boards and fixed with an adhesive, wherein the end of one hard board is connected to the other A stepped portion is formed by being recessed from the end of the hard substrate, and the flexible wiring board is pulled out from the stepped portion and directed toward the arrangement direction of the hard substrate having a protruding end that is not recessed. The flexible wiring board is bent and disposed.

  The present invention provides a flexible wiring board in which a predetermined conductive path is formed on at least one surface of the front and back surfaces of a flexible insulating film, and the flexible wiring board is composed of a first hard substrate and a second hard substrate. The present invention relates to a flex-rigid wiring board having a rigid wiring board sandwiched between and fixed via an adhesive, and a method for arranging the same, and suppresses the occurrence of cracks in a bent portion of the flexible wiring board, and the flexible wiring It is possible to provide a flex-rigid wiring board excellent in the flexibility of the board and a method for arranging the same.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings, but the same reference numerals are given to the same or corresponding portions as in the conventional example, and detailed description thereof will be omitted.

  FIG. 1 is an enlarged cross-sectional view of a main part of a flex-rigid wiring board A which is a main part of the present invention. The flex-rigid wiring board A is composed of a flexible wiring board 1 and a rigid wiring board 4.

  The flexible wiring board 1 is formed by forming a predetermined conductive path 12 in a flexible insulating film 11 (see FIG. 3), and is electrically connected to a rigid wiring board 4 described in detail later. Connected in the connected state. Examples of the insulating film 11 include organic films such as polyimide, epoxy resin, fluororesin, and polyphenylene oxide.

  The rigid wiring board 4 holds the flexible wiring board 1 between the first and second hard substrates 41 and 42 with an adhesive 3 therebetween, and connects and fixes the flexible wiring board 1. The first and second hard substrates 41 and 42 are obtained by forming a predetermined wiring pattern (not shown) on a non-flexible hard plate such as paper phenol resin or resin containing glass fiber. The rigid wiring board 4 positions the end portion 41a of the first hard substrate (one hard substrate) 41 in a state of being recessed with respect to the end portion 42a of the second hard substrate (the other hard substrate) 42. The step 43 is constituted by the above.

  As a method for arranging the flex-rigid wiring board 1 and the flex-rigid wiring board 1, the end portion 41a of the first hard substrate 41 is positioned in a state of being recessed from the end portion 42a of the second hard substrate 42. The stepped portion 43 is formed, the flexible wiring board 1 is pulled out from the stepped portion 43, and the flexible wiring board 1 is bent toward the arrangement direction of the second hard substrate 42 having the protruding end portion 42a that is not recessed. Are arranged.

  Therefore, the flexible wiring board 1 is bent from the portion where the fillet-like surplus adhesive 3a is adhered due to the presence of the protruding end portion 42a of the stepped portion 43 provided in the bending direction of the flexible wiring board 1. By securing the distance to the place to be done, the stress in the tensile direction accompanying the bending of the flexible wiring board 1 can be relaxed, the occurrence of cracks in the flexible wiring board 1 is suppressed, and the flexibility of the flexible wiring board 1 is excellent. The flex-rigid wiring board A and the arrangement method thereof can be obtained.

  Further, the flex-rigid wiring board A constitutes a stepped portion 43 by making the end portion 41a of the first hard substrate 41 recessed from the end portion 42a of the second hard substrate 42. When forming the wiring board 2, the stepped portion 43 can be obtained simply by making the end portions 41 a and 42 a of the respective hard substrates 41 and 42 uneven, making the formation process of the rigid wiring board 4 complicated. The stepped portion 43 can be obtained without any problem.

  FIG. 2 shows another embodiment of the present invention. The same or corresponding portions as those of the above-described embodiment and the conventional example are denoted by the same reference numerals, and detailed description thereof is omitted.

  Another embodiment of the present invention is different from the above-described embodiment in that the flexible wiring board is pulled out from the rigid wiring board in two directions. That is, the flex rigid wiring board A has first and second ends of the rigid wiring board 5 in which the flexible wiring board 1 is sandwiched between the first hard substrate 51 and the second hard substrate 52 via the adhesive 3. It is characterized by providing the second step portions 53 and 54. The first step portion 53 is configured by setting one end portion 51a of the first hard substrate 51 to be recessed from the one end portion 52a of the second hard substrate 52, and the second step portion 53a. The part 54 is configured by setting the other end 52 b of the second hard substrate 52 to be recessed from the other end 51 b of the first hard substrate 51. Therefore, the bending direction of the flexible wiring board 1 is bent toward the second hard substrate 52 at the first step portion 53, and is bent toward the first hard substrate 51 at the second step portion 54.

  The flex-rigid wiring board A shown in the other embodiments described above can achieve the same effects as those of the previous embodiments.

  In addition, the flex-rigid wiring board A in each embodiment of the present invention has a configuration in which the rigid wiring board 2 is provided at both ends of the flexible wiring board 1 or a configuration in which the flexible wiring board 1 is drawn out from both ends of the rigid wiring board 5. However, the configuration of the flex-rigid wiring board according to the present invention includes, for example, first, second, and third rigid wiring boards, and the rigid wiring boards are connected by a flexible wiring board. The configuration of the flex-rigid wiring board of the present invention is not limited to the configuration described above.

  INDUSTRIAL APPLICABILITY The present invention has an excellent effect on a flex-rigid wiring board for mounting electronic parts such as an electronic device such as a mobile phone, a mobile terminal, a remote control device for an air conditioning control device, or an electronic measuring device such as a ship or an automobile It is something that is emitted.

The principal part expanded sectional view of the flex-rigid wiring board of embodiment of this invention. The principal part expanded sectional view of the flex-rigid wiring board of other embodiment of this invention. The perspective view which shows the conventional flex rigid wiring board. The principal part expanded sectional view of the conventional flexible rigid wiring board same as the above. The side view of the conventional flexible rigid wiring board same as the above.

Explanation of symbols

A Flex-rigid wiring board 1 Flexible wiring board 11 Insulating film 12 Conductive path 4, 5 Rigid wiring boards 41 and 51 First hard board (one hard board)
42, 52 Second hard substrate (the other hard substrate)
3 Adhesive 3a Excess adhesive 41a, 51a End
51a, 52a end

Claims (4)

A flexible wiring board in which a predetermined conductive path is formed on at least one of the front and back surfaces of the insulating film having flexibility, and the flexible wiring board is sandwiched between the first hard board and the second hard board. A rigid wiring board comprising a rigid wiring board fixed via an adhesive,
A flex-rigid wiring board, wherein a stepped portion is provided at a periphery of the rigid wiring board, and the flexible wiring board is drawn out from a region where the stepped portion is formed. The flex-rigid wiring board according to claim 1, wherein the step portion is configured by disposing an end portion of one hard substrate in a state of being recessed from an end portion of the other hard substrate. The flex-rigid wiring board according to claim 2, wherein the flexible wiring board drawn out from the stepped portion is bent toward the arrangement direction of the hard substrate having a protruding end portion that is not recessed. . A flexible wiring board in which a predetermined conductive path is formed on at least one surface of the front and back surfaces of a flexible insulating film, and the flexible wiring board is sandwiched between two hard substrates and fixed with an adhesive. A rigid wiring board comprising: a flex rigid wiring board comprising:
A stepped portion is formed by making the end of one hard substrate recessed from the end of the other hard substrate, the flexible wiring board is pulled out from the stepped portion, and the protruding end that is not recessed A flexible rigid wiring board arrangement method, wherein the flexible wiring board is bent and arranged in the arrangement direction of a hard substrate having a surface.

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