JPH0627982Y2 - Rigid flex wiring board - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a structure of a printed wiring board including a rigid portion and a flexible portion.

[Prior Art] A flexible printed wiring board is not merely a substitute for a flexible wiring material, and electronic parts or the like are directly mounted on the flexible printed wiring board, and the parts on which the electronic parts or the like are mounted do not bend. It is preferably a rigid portion.

Therefore, recently, flexible printed wiring boards (hereinafter,
A rigid reinforcing plate or a rigid printed circuit board is laminated or polymerized in a partial area of the
There is an increasing tendency for a printed wiring board (hereinafter, referred to as a rigid flex wiring board) having a rigid portion formed on C and having a rigid portion and a flexible portion on which electronic parts and the like can be mounted, and the flexible wiring portion.

8 to 11 are views for explaining the conventional technique. FIG. 8 is a plan view of a conventional rigid flex wiring board, FIG. 9 is a front view thereof, and FIG. 10 is an assembly of a conventional rigid flex wiring board. FIG. 11 is a plan view of the state, and FIG. 11 is a front view thereof.

In these drawings, reference numeral 1 is a rigid flex wiring board, reference numeral 2 is a flexible portion, reference numeral 3 is a rigid portion, and reference numeral 4 is an electronic component mounted on the rigid portion 3. The conventional rigid flex wiring board 1 has a structure in which a flexible portion 2 extends from one side of a rectangular rigid portion 3 as shown in the figure. Reference numeral 6 is an exposed portion of the conductive foil exposed at the tip of the flexible portion 2 of the rigid flex plate 1. The reinforcing plate 6a is lined and reinforced, and the exposed exposed portion 6 of the flexible portion 2 is electrically conductive. It is adapted to be connected to the connector 8 of the component 7.

And, for example, as shown in FIG. 10 and FIG.
In the case where the rigid portion 3 is in a horizontal state and the side edge portion 3a on the extending side of the flexible portion 2 is disposed vertically close to the automobile body 5 or the like, the flexible portion 2
Must be bent by 90 ° or more near the boundary with the rigid portion 3 and assembled.

[Problems to be solved by the device]

In order to bring the rigid portion 3 closer to the vehicle body 5, it is necessary to avoid contact with the vehicle body 5,
The bending radius R of the flexible portion 2 must be reduced accordingly. However, if the bend R is small, there is a problem that the bent portion 2a is more likely to be fatigue-broken due to the repeated stress due to the transmitted vibration or the like, and the probability of wiring failure increases.

Of course, stress concentration can be avoided by bending the flexible portion 2 with a large radius of curvature. However, in this case, the side edge portion 3a on the extending side of the flexible portion 2 cannot be brought close to the automobile body 5 or the like, and the rigid portion 3 is set to fill the narrow space, and the electronic component is mounted on the rigid portion 3. There was a problem that the request was not satisfied.

The present invention has been made in view of the above-mentioned problems of the prior art,
It is an object of the present invention to provide a rigid flex wiring board which is convenient for bending and arranging a flexible portion extending from the rigid portion at a boundary position with the rigid portion.

[Means for Solving the Problems]

To achieve the above object, in a rigid flex wiring board according to the present invention, a rigid portion and a strip-shaped flexible portion that extends from a side edge portion of the rigid portion and is bent and arranged at an extended root position. In the rigid flex wiring board consisting of, a side edge concave portion wider than the flexible portion is formed in the flexible portion extension region of the rigid portion, and both sides of the root of the flexible portion are formed in the rigid portion. A concave portion is formed along the edge concave portion.

[Action]

According to the rigid flex wiring board of the present invention, by bending the flexible portion at the side edge concave portion of the rigid portion, the bending R of the bent portion of the flexible portion can be increased by the amount corresponding to the side edge concave portion of the rigid portion.

〔Example〕

 Next, an embodiment of the present invention will be described with reference to the drawings.

1 to 5 show an embodiment of the present invention.
The figure is a plan view of the rigid flex wiring board, FIG. 2 is its front view, FIG. 3 is its bottom view, FIG. 4 is a plan view showing how the rigid flex wiring board is assembled, and FIG. 5 is its front view. is there.

In these drawings, reference numeral 10 is a rigid flex wiring board, which is composed of a flexible portion 12 having high flexibility and a rigid portion 13 having no flexibility.

As shown in FIGS. 1 to 3, the rigid flex wiring board 10 has a structure in which an insulating hard reinforcing plate 30 is laminated on a partial region of a substantially T-shaped FPC 20 in a plan view.
The T-shaped horizontal rod-shaped region 20a of the FPC 20 has a wide rectangular shape so that the electronic components 4 and the like can be mounted, and the T-shaped vertical rod-shaped region 20b, which is a narrow conductive path wiring portion, extends in a strip shape from this. It has a shape. Then, at the tip of the T-shaped vertical bar-shaped portion region 20b, a part of the conductive foil is exposed and the connection terminal portion 2
6 is formed and an insulating hard reinforcing plate 28 is lined on the back surface of the terminal portion 26 to enhance the reinforcement of the connection portion.

The reinforcing plate 30 has the same planar shape as the T-shaped horizontal rod-shaped region 20a of the FPC 20, and is laminated and integrated on the back surface of the T-shaped horizontal rod-shaped region 20a by an appropriate means such as adhesion or a clip. Then, the T-shaped horizontal bar portion region 20a of the FPC 20 lined with the reinforcing plate 30 is the rigid flex wiring board 1
0 of the rigid portion 13 is formed, and the T-shaped vertical bar portion region 20b of the FPC 20 forms the flexible portion 12 of the rigid flex wiring board 10.

The root of the T-shaped vertical rod-shaped portion region 20b of the FPC 20 is notched in a semicircular shape on the T-shaped horizontal rod-shaped portion 20a side, as indicated by reference numeral 22. On the other hand, F of the reinforcing plate 30
A concave portion 32 having a shape matching the notch 22 is formed in the side edge portion 31 of the PC on the extending side of the T-shaped vertical rod portion region 20b.

Therefore, as shown in FIGS. 4 and 5, when the side edge portion 31 of the reinforcing plate 30 on the FPC extension side is arranged close to the vehicle body 5, the T-shaped vertical bar portion of the FPC 20 is arranged. The region 20b is bent and arranged at the position of the notch 22, and the bending R of the bent portion 23 is curved at a depth d equivalent to the depth of the recess 32 formed in the side edge portion 31 of the reinforcing plate 30. It is possible to make a large bend R having a radius. Therefore, problems such as breakage of the bent portion 23 of the FPC 20 due to fatigue are reduced.

Further, by allowing the bent portion 23 of the FPC 20 to fit in the recess 32, the rigid portion 13 can be brought closer to the body 5 of the automobile, and the space can be effectively used accordingly. Further, when the position of the rigid portion 13 relative to the body 5 is considered to be constant, the reinforcing plate 30
Since the area of the rigid portion 13 is expanded by the depth d of the concave portion 32 formed in, there is also an advantage that a mounting space for the electronic component 4 and the like can be increased.

Reference numeral 7 is an electric component to which the rigid flex wiring board 10 is connected, and reference numeral 8 is a connector provided on the electric component 7 for connecting a wiring board side terminal.

6 and 7 show another embodiment of the present invention.
FIG. 6 is a plan view of the rigid flex plate, and FIG. 7 is a front view thereof.

In the above-described embodiment, the reinforcing plate 30 forming the rigid portion 13 of the rigid flex wiring board 10 is a simple hard plate, but in the present embodiment, it is mounted on the rigid printed wiring board 40 on which the electronic component 4 is mounted. One end region 20c of the shaped FPC 20 is laminated, and the conductive path of the FPC 20 and the conductive path of the rigid printed wiring board 40 are electrically connected. Reference numeral 42 is a recess formed in the side edge portion 41 of the rigid printed wiring board 40, and the FPC 20 extends in a strip shape from the position of the recess 42. Others are the same as those in the first embodiment described above, and the description thereof will be omitted by giving the same reference numerals.

[Effect of device]

As is apparent from the above description, the present invention has the following effects.

(1) By bending the flexible portion at the position of the side edge concave portion of the rigid portion, the bend R of the bent portion of the flexible portion can be increased by an amount corresponding to the side edge concave portion of the rigid portion, and the bent portion of the flexible portion can be fatigue-broken. It is less and a wiring structure with high durability can be obtained.

(2) Since it is possible to secure a large area of the rigid portion, that is, an area on which electronic components and the like can be mounted, there is a margin for mounting electronic components.

(3) Since the side edge of the rigid portion where the flexible portion extends can be arranged close to other members such as the vehicle body of an automobile, the space for disposing the rigid flex wiring board can be saved.

[Brief description of drawings]

FIG. 1 is a plan view of a rigid flex wiring board according to an embodiment of the present invention, FIG. 2 is a front view thereof, FIG. 3 is a bottom view thereof, and FIG. 4 is a plan view showing an assembled state of the rigid flex wiring board. FIG. 5 is a front view of the same, FIG. 6 is a plan view of a rigid flex wiring board which is another embodiment of the present invention,
FIG. 7 is a front view thereof, FIG. 8 is a plan view of a conventional rigid flex wiring board, FIG. 9 is a front view thereof, and FIG. 10 is a plan view of an assembled state of a conventional rigid flex wiring board. The figure is a front view thereof. 10 ... Rigid flex wiring board, 12 ... Flexible part, 13 ... Rigid part, 20 ... FPC, 30 ... Reinforcing plate, 32 ... Recessed side edge recess. 40 ... Rigid printed wiring board, 42 ... Side edge recessed portion of the rigid printed wiring board.

Claims (1)

[Scope of utility model registration request] 1. A rigid flex wiring board comprising a rigid portion and a strip-shaped flexible portion that extends from a side edge portion of the rigid portion and is bent and arranged at an extension root position. Side extension recesses wider than the flexible portion are formed in the partial extension region, and recesses along the side edge recesses formed in the rigid portion are formed on both sides of the root of the flexible portion. Rigid flex wiring board.