JP2004221222A - Rigid flexible multi-layer printed-wiring board and method for accommodating the same in case - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an accommodation method that eliminates plays and folds at an inner-periphery side occurring while bending a flexible section when bending a rigid flexible wiring board for accommodating in a case, and further can reduce a total thickness when bending the flexible section for accommodating a rigid flexible multi-layer printed-wiring board in the case; and to provide the rigid flexible multi-layer printed circuit board. <P>SOLUTION: In the rigid flexible multi-layer printed circuit board, at least two flexible sections are pulled out of one rigid section 4, and a portion where the pulled flexible sections 2, 3 are to be extended is connected to the other rigid section 5 integrally. The flexible sections are bent nearly in an S shape for accommodating in the case. At one of the rigid sections, a recessed groove is provided where the recessed groove accommodates and retains one portion when the flexible section is bent nearly in the S shape. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
SUMMARY OF THE INVENTION The present invention provides a method of storing a rigid-flex multilayer printed wiring board, in which a plurality of flexible portions are drawn out from a rigid portion, when the flexible portion is housed in a housing, in which the flexure of the flexible portion is eliminated and disconnection of the flexible portion is prevented. And a rigid-flex multilayer printed wiring board suitable for a method for storing the same.
[0002]
[Prior art]
Conventionally, a rigid-flex multilayer printed wiring board has a structure in which a plurality of flexible portions are drawn out from a rigid portion, and the extending end of the drawn-out flexible portion is connected to and integrated with another rigid portion. Therefore, when the flexible part of the rigid-flex multilayer printed wiring board is folded and stored in the housing, the length of the outer flexible part is the same as that of the inner flexible part, causing the inner flexible part to bend. In this case, a fold was formed in the flexible portion, and a defect leading to disconnection often occurred.
[0003]
This phenomenon is a problem that occurs because the lengths of the flexible portions are the same, and the sharper the bending angle, the more noticeable the folds (breaks) appear in the flexible portions.
[0004]
FIG. 7 is a cross-sectional view of a rigid-flex multilayer printed wiring board 11 according to the prior art, which has structures of flexible portions 12 and 13 and rigid portions 14 and 15. The flexible portions 12 and 13 extend from separate layers of the rigid portion 14 and are connected to and integrated with the respective layers of the rigid portion 15.
[0005]
FIG. 8 shows a state where the flexible portion is bent. Since the flexible portions 12 and 13 connecting the rigid portions 14 and 15 have the same length, when the flexible portions 12 and 13 are bent, the flexible portion 12 on the inner side is not bent in a circular shape but is bent with a part of the fold.
[0006]
In order to solve the problem described above, the distance between the flexible portions 12 and 13 between the rigid portions 14 and 15 is generally changed between the outer peripheral side and the inner peripheral side, but alignment during lamination is difficult, and the yield is extremely high. bad.
[0007]
Further, as disclosed in Japanese Patent Application Laid-Open No. 2002-16323, a single-layer flexible portion is divided into two paths, and the flexible substrates of both paths are folded in a line-symmetrical manner, so that the flexible portions extend from a plurality of layers. It has been proposed to have the same function, but even with this configuration, if the flexure is bent symmetrically due to the same distance between the outer periphery and the inner periphery of the flexible part, bending may occur at the fold, leading to disconnection Therefore, it was not enough measures.
[0008]
[Problems to be solved by the invention]
The present invention has been made in order to solve the problems described above, and a rigid-flex multilayer printed wiring board capable of preventing generation of folds in a flexible portion and disconnection of wiring due to bending generated on the inner peripheral side. It is an object of the present invention to provide a method for housing the housing.
[0009]
Particularly, a method of storing a rigid-flex multilayer printed wiring board in a housing, which can reduce the total thickness of the rigid-flex multilayer printed wiring board when housed in the housing, and a rigid-flex suitable for the storing method It is an object to provide a multilayer printed wiring board.
[0010]
[Means for Solving the Problems]
According to the first aspect of the present invention, there is provided a rigid-flex multilayer printed wiring in which two or more flexible portions are drawn out from one rigid portion, and the extension of the drawn-out flexible portion is connected to and integrated with the other rigid portion. The above object has been achieved by bending a flexible portion of the plate into a substantially S-shape and housing the plate in a housing.
That is, by bending the flexible portion into a substantially S-shape, the bending generated on the inner peripheral side can be absorbed, and it is possible to prevent the flexible portion from being creased and disconnecting the wiring.
[0011]
According to a second aspect of the present invention, in the storage method according to the first aspect, a concave groove portion is formed in one of the rigid portions, and a part of the flexible portion is stored and held in the concave groove portion and bent into a substantially S shape. Thereby, the above object has been achieved.
In the case where the flexible portion is bent into a substantially S-shape and stored in the housing, two or more flexible portions are bent and overlap with the rigid portion, so that the portion where the rigid portion and the flexible portion overlap each other is The thickness increases, and a problem in storage in the housing may occur. In such a case, as described above, the flexible portion is bent, and the rigid portion corresponding to the position overlapping the rigid portion is subjected to counterboring along the width of the flexible portion to form a concave groove portion, and the flexible portion is formed in the concave groove portion. By storing and holding, the total thickness can be reduced, and the thickness of the housing can also be reduced. Furthermore, accurate positioning of the flexible portion is possible by providing the concave portion in the rigid portion.
[0012]
The invention according to claim 3 achieves the above object by a rigid-flex multilayer printed wiring board having a concave groove for accommodating and holding a part of one of the rigid parts when the flexible part is bent substantially in an S-shape. It is.
That is, by using the rigid-flex multilayer printed wiring board having such a concave portion, a part of the flexible portion can be stored and held in the concave portion when the flexible portion is bent in a substantially S-shape. Can be made thinner at the portions where they overlap.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described below.
FIG. 1 is a plan view of a rigid-flex multilayer printed wiring board according to the present invention as viewed from directly above. FIG. 2 is a bottom view of the rigid-flex multilayer printed wiring board as viewed from the opposite side to FIG. FIG. 3 is a sectional view taken along line AA of FIG.
[0014]
1 to 3, a rigid-flex multilayer printed wiring board 1 includes flexible portions 2 and 3 and rigid portions 4 and 5, and has a structure in which the flexible portions 2 and 3 are sandwiched between the rigid portions 4 and 5. .
[0015]
FIG. 4 is a sectional view taken along line BB of FIG.
[0016]
In FIG. 4, a concave portion 6 is formed in a rigid portion corresponding to a position where the flexible portion 3 overlaps the rigid portion 5 when the flexible portions 2 and 3 are bent, by counterbore processing along the width of the flexible portions 2 and 3. ing.
[0017]
The concrete groove forming method described above is not particularly limited as long as it can store and hold the bent flexible part. However, mass production is better if an opening is provided before laminating the substrates. In terms of efficiency, it is efficient and preferable.
[0018]
FIG. 5 is a cross-sectional view showing a state in which the flexible portion of the rigid-flex multilayer printed wiring board of the present invention is bent in a substantially S-shape.
[0019]
In FIG. 5, the flexible portions 2 and 3 are once bent at 180 °, then further inverted by 180 ° and bent along the concave groove portion 6 in a substantially S-shape.
[0020]
FIG. 6 is a sectional view taken along line CC of FIG.
[0021]
In FIG. 6, the flexible portion 3 is bent and a part thereof is stored and held in the concave groove portion 6 of the rigid portion 5.
[0022]
In FIGS. 5 and 6, only the flexible portion 3 is housed in the concave groove portion 6, but the flexible portions 2 and 3 may be housed together.
[0023]
Then, in the state of FIGS. 5 and 6, the rigid-flex multilayer printed wiring board is housed in the housing.
[0024]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, when bending and accommodating a rigid-flex multilayer printed wiring board in a housing | casing, the bending and the fold of the inner peripheral side which generate | occur | produce when bending a flexible part can be eliminated. In particular, by using the concave groove of the rigid portion, the total thickness when the rigid-flex multilayer printed wiring board is stored in the housing can be reduced.
[Brief description of the drawings]
FIG. 1 is a plan view of a rigid-flex multilayer printed wiring board according to the present invention.
FIG. 2 is a bottom view of the rigid-flex multilayer printed wiring board according to the present invention.
FIG. 3 is a sectional view taken along line AA of FIG. 1;
FIG. 4 is a sectional view taken along line BB of FIG. 1;
FIG. 5 is a cross-sectional view of the rigid-flex multilayer printed wiring board according to the present invention when the flexible portion is bent.
FIG. 6 is a sectional view taken along line CC of FIG. 5;
FIG. 7 is a cross-sectional view of a conventional rigid-flex multilayer printed wiring board.
FIG. 8 is a cross-sectional view of a conventional rigid / flexible multilayer printed wiring board when a flexible portion is bent.
[Explanation of symbols]
1, 11: rigid / flexible multilayer printed wiring board 4, 5, 14, 15: rigid portion 2, 3, 12, 13: flexible portion 6: concave portion

Claims (3)

Two or more flexible portions are pulled out from one rigid portion, and the extended portion of the drawn-out flexible portion is connected to and integrated with the other rigid portion to form a rigid-flex multilayer printed wiring board. A method for storing a rigid-flex multilayer printed wiring board in a housing, wherein the housing is bent into an S shape and stored in the housing. 2. A rigid-flex multilayer printed wiring board according to claim 1, wherein a concave groove is formed in one of the rigid parts, and the concave part is bent into a substantially S-shape while storing and holding a part of the flexible part in the concave groove. How to store in the housing. A rigid-flex multilayer printed wiring board, characterized in that one of the rigid parts has a concave groove part for storing and holding a part of the flexible part when the flexible part is bent substantially in an S-shape.

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