JP2002151806A - Flexible wiring board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the strength of a flexible wiring board so as to prevent the occurrence of disconnections due to bending of contacting sections. SOLUTION: This flexible wiring board has first and second conductive contacting sections 11 and 12, arranged on one surface of a base plate 1. The first contacting sections 11 have first tapered-off sections 11a on the first narrow-width section side 11b of a first wiring pattern 4, and the second contacting sections 12 have second tapered-off sections 12a their front ends. The first and second tapered-off sections 11a and 12a are arranged close to each other in third and fourth directions B and B' and contain a uniaxial imaginary line X drawn in first and second directions A and A'.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an FPC (flexible printed circuit) wiring board and an FFC.
(Flexible flat cable) belongs to flexible wiring boards such as wiring boards.

[0002]

2. Description of the Related Art As shown in FIGS. 8 and 9, a conventional flexible wiring board comprises an insulating base plate 51, a first direction A parallel to one side 51a of the base plate 51, and a direction A in one direction. Is a conductive first contact portion 61 disposed on the surface of the base plate 51 on the side 51a in the second direction A 'in the opposite direction;
And the base is displaced rearward from the first contact portion 61 in a second direction B orthogonal to the second directions A and A 'and a fourth direction B' opposite to the second direction B. A conductive second contact portion 62 disposed on the surface of the base plate 51; and a conductive second contact portion 62 connected to the first contact portion 61 and extending rearward in the fourth direction B 'and disposed on the base plate 51 surface. And a second conductive pattern 54 connected to the second contact portion 62 and extending rearward in the fourth direction B ′ and disposed on the surface of the base plate 1. have.

Further, the flexible wiring board is provided with the first and second contact portions 61 and 62 and a part of the first and second wiring patterns 53 and 54 exposed, and the remaining first and second contact patterns 61 and 62 are exposed. And a cover plate 74 in which the wiring patterns 53 and 54 are covered on the base plate 51 surface.

A plurality of first contact portions 61 having a first wiring pattern 53 and a second contact portion 61 having a second wiring pattern 54 are provided.
Are arranged alternately in the first, second, third, and fourth directions A, A ', B, B'.
And the second contact portions 61 and 62 are in the first and second directions A,
A 'is formed to be wider than the width of the first and second wiring patterns 53 and 54 at A'.

[0005] The second contact portion 62 is provided in the first wiring pattern 5 which is closely opposed in the third and fourth directions B and B '.
4 has a first narrow portion 61b formed to have a narrow width in the first and second directions A and A '.

[0006]

However, in the conventional flexible wiring board, since the portion of the base 51 where the cover plate 74 does not exist is thin, the bending strength is low and the base plate facing one side of the cover plate 74 is not provided. The 51 portion is also easily bent.

In the portion where the bending strength is low, the first narrow portion 61b located directly above the first contact portion 61 has the first width in the third and fourth directions B and B '. Narrow part 61
Other than b, there is a portion having no conductor configuration.

Therefore, for example, there is a problem that the first narrow portion 11b is easily disconnected due to the bending shown by the two-dot chain line in FIG.

Further, in a state where the flexible wiring board is bent outside the connector in a state where the flexible wiring board is bent outside the connector, both ends of the flexible wiring board may be strongly bent. Accordingly, there is a problem that the flexible wiring board, particularly, the first narrow portion 61b is easily disconnected.

[0010] Therefore, an object of the present invention is to provide a flexible wiring board which has high strength against bending, and in particular, hardly disconnects a narrow portion of a wiring pattern.

[0011]

According to the present invention, an insulating base plate is provided in a first direction parallel to one side of the base plate and a second direction opposite to the first direction. A conductive first contact portion, at least a plurality of which is disposed on the one side of the base plate surface, and a third contact portion which is orthogonal to the first and second directions.
And a second conductive portion, which is displaced in the fourth direction from the first contact portion in the fourth direction in a direction opposite to the third direction and in a fourth direction opposite to the third direction. Contact area,
A conductive first arrangement pattern connected to the first contact portion and extending in the fourth direction and arranged on the surface of the base plate 1; and a fourth conductive pattern connected to the second contact portion. And a plurality of the first contact portions having the first wiring pattern and the second wiring A plurality of the second contact portions having a pattern are alternately arranged in a state of approaching in the first and second directions, and the first and second contact portions are arranged in the first and second directions. The width of the first and second wiring patterns is wider than the width of the first and second wiring patterns in the direction, and the second contact portion is closer to and opposed to the second contact portion in the first and second directions. A frame having a first narrow portion in which a part of one wiring pattern is formed to have a narrow width in the first and second directions. In the sibling wiring board, the first contact portion is formed such that a connection portion connected to the first narrow portion is tapered in the fourth direction toward the first narrow portion. A first tapered portion;
Has a second tapered portion having a tip portion tapered toward the tip in the third direction, and the first and second tapered portions have the first and second tapered portions. A flexible printed circuit board is provided, which is arranged in the third and fourth directions so as to include a uniaxial imaginary line parallel to the second direction, and is arranged closely in the first and second directions. .

Further, according to the present invention, an insulating base plate and at least the base plate in a first direction parallel to one side of the base plate and a second direction opposite to the first direction. A conductive first contact portion, a plurality of which are arranged on the one side of the surface, a third direction orthogonal to the first and second directions, and a fourth direction opposite to the third direction; A conductive second contact portion displaced in the fourth direction from the first contact portion in the fourth direction and a plurality of conductive contact portions are disposed on the base plate surface, and the second contact portion is connected to the first contact portion. The base plate 1 extending in the direction of
A first conductive pattern disposed on the surface, and the second conductive pattern;
And a second conductive pattern disposed on the base plate surface and extending in the fourth direction, the first contact pattern having the first wiring pattern. A plurality of parts and a plurality of the second contact parts having the second wiring pattern are alternately arranged in a state of being close to each other in the first and second directions; A portion is formed in the first and second directions to have a width wider than a width of the first and second wiring patterns, and the second contact portion is formed in the first and second directions in the first and second directions. A part of the first wiring pattern which is closely opposed to the first and second wiring patterns is formed by the first and second wiring patterns.
In the flexible wiring board having a first narrow portion formed to have a narrow width dimension in the direction, the second contact portion extends from the tip to the one side in the third direction. A width dimension in the first and second directions is smaller than that of the second wiring pattern, and a second narrow portion is provided on the base plate surface; Are positioned at least between the first contact portions with respect to the first contact portion with an interval in the first and second directions.

[0013]

In the flexible wiring board according to the present invention, the second contact portion is provided in the vicinity of the first narrow portion, and the first and second tapered portions are provided so as to be almost overlapped. Therefore, when the flexible wiring board is bent, the strength against bending is increased by the second contact portion or the first and second tapered portions. Therefore, the configuration is such that the first narrow portion is hard to be disconnected even though it is a narrow portion.

Further, in the flexible wiring board of the present invention, when the flexible wiring board is bent, the second contact portion is provided near the first narrow portion, and the first contact portion is provided. , The second narrow portion is disposed in the vicinity, so that the second contact portion or the second narrow portion increases the strength against bending, and the first narrow portion is a narrow portion. Regardless, the structure is difficult to disconnect.

Further, since the conductor portion extends between the cover plate and the base plate, the flexible wiring board is hardly bent extremely, and the strength is increased. The configuration is such that the portion is hardly disconnected.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a flexible wiring board according to the present invention will be described with reference to the drawings.
1 and 2 show a first embodiment of a flexible wiring board according to the present invention.

Referring to FIGS. 1 and 2, the flexible wiring board according to the first embodiment includes an insulating base plate 1 and a first direction A and a first direction A parallel to one side 1a of the base plate 1. Conductive contact portion 11 disposed on the surface of the base plate 1 on the side 1a in the second direction A 'opposite to the direction A of FIG.
And a first direction B ′ perpendicular to the first and second directions A and A ′ and a fourth direction B ′ opposite to the second direction B.
A conductive second contact portion 12 displaced rearward from the contact portion 11 and disposed on the surface of the base plate 1;
1 and a conductive first arrangement pattern 3 extending rearward in the fourth direction B 'and arranged on the surface of the base plate 1 and a fourth direction B connected to the second contact portion 12. 'And a second conductive pattern 4 extending rearward and disposed on the surface of the base plate 1.

Further, the flexible wiring board is provided with the first and second contact portions 11 and 12 and the first and second wiring patterns 3 and 4 partially exposed while the remaining first and second contact portions 11 and 12 are exposed.
Cover plate 14 in which the wiring patterns 3 and 4 are covered on the surface of the base plate 1.

The flexible wiring board has one end connected to, for example, a connector to be described later, and the other end connected to a circuit board mounted on the device. Normally, the base plate 1 is a strip-shaped film plate having a small thickness, and has first and second arrangements in the third and fourth directions B and B 'of the base plate 1 (the longitudinal direction of the base plate 1). The arrangement patterns 3 and 4 are provided, and a part of the second arrangement pattern 4 and the first and second contact portions 11 and 12 are exposed at both ends in the longitudinal direction of the base plate 1.

The first and second contact portions 11 and 12 and the first and second arrangement patterns 3 and 4 employ thin conductive members such as metal films. The cover plate 14 is a strip-shaped thin film plate and covers an intermediate portion of the first and second arrangement patterns 3 and 4 in the longitudinal direction. Therefore, the flexible wiring board has a flexible form that is easily bent in a direction perpendicular to the longitudinal direction.

On the base plate 1, a plurality of first and second contact portions 11, 12 and first and second arrangement patterns 3,
4 are arranged so as not to contact each other. The plurality of first contact portions 11 having the first wiring pattern 3 and the plurality of second contact portions 12 having the second wiring pattern 4
These are alternately arranged in a state of approaching in the first and second directions A and A '. The base plate 1 has first and second
Are formed in the first and second directions A and A 'to be wider than the widths of the first and second wiring patterns 3 and 4. The first wiring pattern 4 facing the second contact portion 12 in the first and second directions A and A '
Has a first narrow portion 11b formed in a part thereof to have a narrow width in the first and second directions A and A '.

The first contact portion 11 has a first narrow portion 11b.
Has a first tapered portion 11a which is tapered in the fourth direction B '. The second contact portion 12 has a second tapered portion 12a in which the tip portion in the third direction B is tapered toward the tip.

The first and second contact portions 11 and 12 in the first embodiment are staggered in the first, second, third and fourth directions A, A ', B and B'. By disposing, the position is shifted. The first and second tapered portions 11a and 12a are formed by a uniaxial virtual line X parallel to the first and second directions A and A 'shown in FIG. 1 (see FIG. 1).
Are arranged in the first and second directions A and A 'and in the third and fourth directions B and B'.

The first and second contact portions 11 and 12 and the first and second contact portions 11 and 12 are exposed on the surface of the base plate 1 where a part of the first and second wiring patterns 3 and 4 is exposed. Conductor portions 13a and 13b are arranged on both outer sides of the
3a, 13b are first and second contact portions 11, 1 on both outer sides.
2 and extending in third and fourth directions B, B '.

The conductor portions 13a, 13b are connected to the first and second contact portions 11, 12 in the first and second directions A, A '.
Is formed to have a width wider than the width dimension. Further, the conductor portions 13a and 13b have a protruding portion 13f approaching the first narrow portion 11b.

The cover plate 14 includes the first and second contact portions 1.
The remaining first and second wiring patterns 3 and 4 are covered on the surface of the base plate 1 while the first and second wiring patterns 3 and 4 are partially exposed. Conductor 13
a and 13b extend in the fourth direction B 'so as to be located between the cover plate 14 and the base plate 1.

In the flexible wiring board shown in FIGS. 1 and 2, when the flexible wiring board shown in FIG. 9 is bent, the first narrow portion 11b is formed.
, A second contact portion 12 is disposed in the vicinity of
And the second tapered portions 11a, 12a are arranged in a state of being nearly overlapped, so that the second contact portion 12 or the first
In addition, the strength against bending is increased by the second tapered portions 11a and 12a, so that the first narrow portion 11b is hardly disconnected even though it is a narrow portion.

FIGS. 3 and 4 show a flexible wiring board according to a second embodiment of the present invention. In describing the flexible wiring board according to the second embodiment, the same portions as those in the first embodiment are denoted by the same reference numerals, and a description of a part of the configuration in the same portion will be omitted.

Referring to FIGS. 3 and 4, the flexible wiring board according to the second embodiment includes an insulating base plate 1 and first and second directions A parallel to one side 1a of base plate 1. , A ′ and a conductive first contact portion 11 disposed on the surface of the base plate 1 on the side 1 a side, the first and second directions A, A ′.
A conductive second contact portion 12 displaced rearward from the first contact portion 11 in the third and fourth directions B and B 'orthogonal to each other and disposed on the surface of the base plate 1; A conductive first arrangement pattern 3 extending rearward in the fourth direction B 'and arranged on the surface of the base plate 1;
And a conductive second arrangement pattern 4 extending rearward in the fourth direction B 'and arranged on the surface of the base plate 1.

Further, the flexible wiring board is provided with the first and second contact portions 11 and 12 and the first and second wiring patterns 3 and 4 partially exposed, while the remaining first and second contact patterns 11 and 12 are exposed.
Cover plate 14 in which the wiring patterns 3 and 4 are covered on the surface of the base plate 1.

On the base plate 1, a plurality of first and second contact portions 11, 12 and first and second arrangement patterns 3,
4 are arranged so as not to contact each other. The plurality of first contact portions 11 having the first wiring pattern 3 and the plurality of second contact portions 12 having the second wiring pattern 4
These are alternately arranged in a state of approaching in the first and second directions A and A '.

The base plate 1 has first and second contact portions 1
1, 12 are first and second directions in first and second directions A, A '.
Are formed wider than the width dimensions of the wiring patterns 3 and 4. The first wiring pattern 4 approaching and facing the second contact portion 12 in the third and fourth directions B and B ′.
Has a first narrow portion 11b formed in a part thereof to have a narrow width in the first and second directions A and A '.

The second contact portion 12 is located on one side 1
The second narrow portion 12b extending to the side a and having a smaller width dimension in the first and second directions A and A ′ than the second wiring pattern 4 and disposed on the surface of the base plate 1 is formed. Have. The second narrow portion 12b is formed between the first contact portions 11 by the first narrow portion.
Are spaced from each other in the first and second directions A and A ′.

In the flexible wiring board shown in FIGS. 3 and 4, when the flexible wiring board is bent like the flexible wiring board described with reference to FIG.
The second contact portion 12 is provided near the first contact portion 11 and the second narrow portion 12b is provided near the first contact portion 11, so that the second contact portion 12 or the second The strength against bending is increased by the narrow portion 12b, and the first narrow portion 11b
Although it is a narrow part, it becomes the structure which is hard to be disconnected.

FIGS. 5 to 7 show a connector 31 as an object to be connected to the flexible wiring board having the configuration described in the first and second embodiments. Referring to FIGS. 5 to 7, connector 31 has insulator 33 and a plurality of contacts 35 a and 35 b attached to insulator 33.

An opening 3 is provided on the upper surface of the insulator 33.
3a are formed. A plurality of contacts 35a, 35 arranged to be connected to the first and second contact portions 11, 12 of the flexible wiring board are formed in the opening 33a.
The contact portion b is provided in an exposed state. The first and second contact portions 11 and 12 of the flexible substrate are in one-to-one contact with the contact portions of the contacts 35a and 35b.

As shown in FIG. 6, the insulator 33 has first and second contacts at the contact portions of the contacts 35a and 35b.
When the first and second contact portions 11 and 12 make one-to-one contact, the first and second contact portions 11 and 12 are brought into contact 35a, 35b.
A rotatable pressing member 39 is provided so as to press and connect the contact portion from the back surface of the front end portion of the flexible wiring board.

As shown in FIG. 6, when the distal end portion of the flexible wiring board is fitted in the insulator 33 and held by the pressing member 39, the insulator 3
3, the middle part of the flexible wiring board is in the direction indicated by the white arrow (the vertical direction in FIG. 6).
Z, Z 'force may be applied.

At this time, the conductor portions 13a, 13a of the flexible wiring board described in the first and second embodiments are used.
3b, the third and fourth directions B, B 'extend between the cover plate 14 and the base plate 1, and the first and second directions B and B'.
Extending in a wide dimension in the directions A and A ′ of
The flexible wiring board is hardly bent and hardened, and the strength is increased. In particular, the first narrow portion 11b is hardly disconnected.

[0040]

As described above, according to the flexible wiring board of the present invention, the second contact portion is provided in the vicinity of the first narrow portion formed in the second wiring pattern. When the flexible wiring board is bent, the first and second tapered portions are disposed so as to be close to each other, so that the second contact portion or the first and second tapered portions are used. It is possible to provide a flexible wiring board which has high strength against bending and has a structure in which the first narrow portion is hardly disconnected even though the first narrow portion is a narrow portion.

In the flexible wiring board according to the present invention, when the flexible wiring board is bent, the second contact portion is provided near the first narrow portion, and the first contact portion is provided. Is provided in the vicinity of the second narrow portion, the strength against bending is increased by the second contact portion or the second narrow portion, and in particular, the first narrow portion is a narrow portion. Nevertheless, it is possible to provide a flexible wiring board having a configuration that is hardly disconnected.

Further, since the conductor portion extends between the cover plate and the base plate, the flexible wiring board is hardly bent and the strength is increased. In particular, the first narrow portion is formed. It becomes the structure which is hard to be disconnected.

[Brief description of the drawings]

FIG. 1 is a plan view showing a main part of a flexible wiring board according to a first embodiment of the present invention.

FIG. 2 is a left side view of the flexible wiring board shown in FIG.

FIG. 3 is a plan view showing a main part of a flexible wiring board according to a second embodiment of the present invention.

FIG. 4 is a left side view of the flexible wiring board shown in FIG. 3;

FIG. 5 is a front view showing a connector connected to the flexible wiring board shown in FIGS. 1 and 3;

6 is a side view showing a state in which a flexible wiring board is being connected to the connector shown in FIG. 5;

FIG. 7 is a plan view of the connector shown in FIG. 5;

FIG. 8 is a plan view showing a flexible wiring board as a conventional technique.

9 is a left side view of the flexible wiring board shown in FIG.

[Explanation of symbols]

 1,51 Base plate 3,53 First arrangement pattern 4,54 Second arrangement pattern 11,61 First contact portion 11b, 61b First narrow portion 11a First tapered portion 12,62 Second contact portion 12a Second tapered portion 12b Second narrow portion 13a, 13b Conductor portion 13f Projection portion 14, 74 Cover plate 31 Connector 33 Insulator 35a, 35b Contact

Claims (5)

[Claims] 1. An insulating base plate, a first direction parallel to one side of the base plate, and a second direction opposite to the first direction.
A plurality of conductive first contact portions provided on at least one side of the base plate surface in the direction of
Are displaced from the first contact part in the fourth direction in a third direction orthogonal to the third direction and in a fourth direction opposite to the third direction, and a plurality of parts are arranged on the base plate surface. A conductive second contact portion provided, a conductive first disposition pattern connected to the first contact portion, extending in the fourth direction, and disposed on the base plate 1 surface; A conductive second arrangement pattern connected to the second contact portion, extending in the fourth direction, and arranged on the base plate surface; and A plurality of the first contact portions and a plurality of the second contact portions having the second wiring pattern are alternately arranged in a state of being close to each other in the first and second directions; 2 is formed in the first and second directions to have a width wider than the width of the first and second wiring patterns. The second
A first narrow portion in which a part of the first wiring pattern which is close to and opposed to the contact portion in the first and second directions is formed to have a narrow width in the first and second directions; In the flexible wiring board having the first contact portion, the connection portion connected to the first narrow portion is directed toward the first narrow portion in the fourth direction. The first contact portion has a first tapered portion formed in a tapered shape, and the second contact portion has a second tapered portion having a tip portion tapered toward the tip in the third direction. The first and second tapered portions approach in the third and fourth directions to include a uniaxial imaginary line parallel to the first and second directions, and the first and second directions. A flexible wiring board, which is disposed close to a flexible wiring board. 2. An insulating base plate, a first direction parallel to one side of the base plate, and a second direction opposite to the first direction.
A plurality of conductive first contact portions provided on at least one side of the base plate surface in the direction of
Are displaced from the first contact part in the fourth direction in a third direction orthogonal to the third direction and in a fourth direction opposite to the third direction, and a plurality of parts are arranged on the base plate surface. A conductive second contact portion provided, a conductive first disposition pattern connected to the first contact portion, extending in the fourth direction, and disposed on the base plate 1 surface; A conductive second arrangement pattern connected to the second contact portion, extending in the fourth direction, and arranged on the base plate surface; and A plurality of the first contact portions and a plurality of the second contact portions having the second wiring pattern are alternately arranged in a state of being close to each other in the first and second directions; 2 is formed in the first and second directions to have a width wider than the width of the first and second wiring patterns. The second
A first narrow portion in which a part of the first wiring pattern which is close to and opposed to the contact portion in the first and second directions is formed to have a narrow width in the first and second directions; In the flexible wiring board having the second contact portion, the second contact portion extends from the tip to the one side in the third direction, and the first and second contact portions are more than the second wiring pattern. And a second narrow portion is provided on the base plate surface, and the second narrow portion is formed at least between the first contact portions by the first contact portion. A flexible wiring board, wherein the flexible wiring board is positioned with respect to a portion in the first and second directions. 3. The flexible wiring board according to claim 1, wherein the first and second contact portions, and the base plate surface exposing a part of the first and second wiring patterns, A conductor portion is disposed close to a first contact portion disposed outside in the first and second directions, and the conductor portion extends in the third and fourth directions; And the first and second in the first and second directions
A flexible wiring board formed to have a width wider than a width dimension of a contact portion of the flexible wiring board. 4. The flexible wiring board according to claim 3, wherein the conductor has a protruding portion approaching the first narrow portion. 5. The flexible wiring board according to claim 4, wherein the first and second contact portions and a part of the first and second wiring patterns are exposed, and the remaining first and second wiring patterns are exposed. A cover plate covering a second wiring pattern on the base plate surface, wherein the conductor portion extends at least in the third direction and is interposed between the cover plate and the base plate; A flexible wiring board characterized by the above-mentioned.