JPH05275814A - Flex rigit wiring board - Google Patents

Abstract

PURPOSE:To improve bending characteristic of a flexible cable attaching base portion in a flex rigid wiring board. CONSTITUTION:Flexible cables 3 are electrically connected at the end face portions 4 of the rigid portions 1, 2 of a flex rigid wiring board. The end face portions 4 of these rigid portions 1, 2 are respectively chamferred and moreover coated with a resin having viscocity and elasticity (for example, epoxy group resin) 5. Therefore, bending characteristic of the fitting base area of flexible cable 3 can be improved because the radius of curvature thereof can be made small without damage or disconnection of pattern even when such portion collides in direct with the end face portions 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flex-rigid wiring board, and more particularly to a flex-rigid wiring board in which the flexibility of a flexible cable is improved.

[0002]

2. Description of the Related Art FIG. 3 (a) is a plan view showing an example of a conventional flex-rigid wiring board, FIG. 3 (b) is a sectional view taken along line BB 'of FIG. 3 (a), and Figure 3 (c)
FIG. 3 is a partially enlarged view of FIG. The flex-rigid wiring board is composed of rigid portions 6 and 7 in which arbitrary patterns forming an electric circuit are formed, and a flexible cable 8 having an arbitrary pattern electrically connected to these rigid portions 6 and 7. There is. In addition, the rigid part 6,
The end surface portion 9 of 7 has a rectangular shape.

FIG. 4 (a) is a diagram showing an example of the mounting form of a conventional flex-rigid wiring board, and FIG. 4 (b) is a partially enlarged view of FIG. 4 (a).

[0004]

When the above-mentioned conventional flex-rigid wiring board is mounted on a device or the like, as shown in FIG.
As shown in FIGS. 7A and 7B, the flexible cable 8 may be strongly bent depending on the mounting form, and the flexible cable 8 and the end surface portion 9 of the rigid portion 6 may come into contact with each other. Since the end surface portion 9 has a rectangular shape and the corner portions are substantially right angles, the surface of the flexible cable 8 is damaged when it is strongly bent in this way, and a crack is generated from this portion to make it flexible. The pattern of the cable 8 may be broken. Therefore, when the flexible cable is bent, the radius of curvature cannot be reduced, that is, it cannot be bent strongly.

[0005]

According to the present invention, there is provided a flex-rigid wiring board having a plurality of rigid portions and a flexible cable electrically connected from end face portions of the rigid portions. The end face portion is chamfered, and a resin having viscoelasticity is applied to a connecting portion between the end face portion and the flexible cable.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

FIG. 1 (a) is a plan view showing an embodiment of the present invention, FIG. 1 (b) is a sectional view taken along the line AA 'in FIG. 1 (a), and FIG. ) Is a partially enlarged view of FIG. The flex-rigid wiring board of the present invention is similar to the conventional example, and the flex-rigid wiring board has rigid portions 1 and 2 on which an arbitrary pattern forming an electric circuit is formed,
Although the flexible cable 3 having an arbitrary pattern is electrically connected to the rigid portions 1 and 2, the corner portions of the end face portions 4 of the rigid portions 1 and 2 are chamfered (for example, R chamfered). ) Has been processed. Further, a viscoelastic resin (for example, epoxy resin) 5 is applied to the end surface portion 4 together with the flexible cable 3.

FIG. 2 (a) is a diagram showing an example of a mounting form of the flex-rigid wiring board of the present invention, and FIG. 2 (b) is a partially enlarged view of FIG. 2 (a). When the flex-rigid wiring board of the present invention is mounted on a device or the like, as shown in FIGS. 2 (a) and 2 (b), the flexible cable 3 is bent depending on the mounting form. Since the end surface portion 4 has no corner portion and the viscoelastic resin 5 is applied, the flexible cable 3 does not directly contact the end surface portion 4.

[0009]

As described above, in the flex-rigid wiring board of the present invention, the corners of the end face portion of the rigid portion are eliminated and the flexible cable is applied so as not to come into contact with the flexible cable. , The surface of the flexible cable is not damaged, and
Excessive bending stress is not applied to the base of the flexible cable. Therefore, there is no fear of breaking the pattern due to the generation of cracks, and the radius of curvature of the flexible cable can be reduced, that is, the flexibility is improved.

[Brief description of drawings]

FIG. 1A is a plan view showing an embodiment of the present invention, FIG. 1B is a sectional view taken along line AA ′ of FIG. 1A, and FIG. [Fig. 4] is a partially enlarged view of the partial view (b).

FIG. 2A is a diagram showing an example of a mounting form of a flex-rigid wiring board according to the present invention, and FIG. 2B is a partially enlarged view of FIG.

FIG. 3A is a plan view showing a conventional example, FIG. 3B is a sectional view taken along the line BB ′ of FIG. 3A, and FIG. It is a partially expanded view of b).

FIG. 4 (a) is a diagram showing an example of a mounting form of a conventional flex-rigid wiring board, and FIG. 4 (b) is a partially enlarged view of FIG. 4 (a).

[Explanation of symbols]

 1, 2, 6, 7 Rigid part 3,8 Flexible cable 4,9 End face part 5 Viscoelastic resin

Claims (1)

[Claims] 1. A flex-rigid wiring board having a plurality of rigid portions and a flexible cable electrically connected from end surfaces of these rigid portions, wherein the end surface portions of the plurality of rigid portions are chamfered. A flex-rigid wiring board is characterized in that a resin having viscoelasticity is applied to a connecting portion between the end surface portion and the flexible cable.