CN101778532A - Bending-resistant flexible printed circuit board - Google Patents
Bending-resistant flexible printed circuit board Download PDFInfo
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- CN101778532A CN101778532A CN201010111080A CN201010111080A CN101778532A CN 101778532 A CN101778532 A CN 101778532A CN 201010111080 A CN201010111080 A CN 201010111080A CN 201010111080 A CN201010111080 A CN 201010111080A CN 101778532 A CN101778532 A CN 101778532A
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Abstract
The invention discloses a bending-resistant flexible printed circuit board. The bending-resistant flexible printed circuit board comprises a finger area and a flexible circuit area, wherein the front surface and the back surface of the finger area are provided with fingers; and the connecting line at the junction of a front finger area and the flexible circuit area is staggered from that of a back finger area and the flexible circuit area. The shear stress lines on the front surface and the back surface are different during bending the bending-resistant flexible printed circuit board, which enhances the bending resistance.
Description
Technical field
The invention belongs to flexible circuit board structure-design technique field, be specifically related to a kind of flexible print circuit board of anti-bending.
Background technology
Flexible circuit board (being called for short FPC) has distribution density height, in light weight, thin thickness, the distribution spatial limitation is less, the flexibility ratio advantages of higher, meet the compact development trend of electronic product fully, therefore be widely used in PC and fields such as peripheral product, communication product, display and consumption electronic products.
Flexible circuit board generally comprises and is used for and the extraneous golden finger that is electrically connected usefulness, when installation is used, generally all needs to bend flexible circuit board, so that it is electrically connected with external circuitry.In the existing design, the positive and negative length unanimity of finger position place golden finger, because the golden finger district compares with remaining printed circuit district, have tangible difference of hardness and intensity difference, also has tangible thickness difference, so in when bending, the golden finger of positive and negative can and the printed wire of softness between the junction produce a bigger shearing force, be easy to take place golden finger from and the printed wire of softness between the phenomenon that fractures of junction.
Fig. 1 to 3 has shown a kind of traditional flexible circuit board, and Fig. 1 is the front view of traditional flexible circuit board, and Fig. 2 is the structural representation of traditional circuit plate shown in Figure 1; Fig. 3 is the reverse view of traditional circuit plate shown in Figure 1.As shown in Figure 2, this tradition flexible circuit board structurally comprises base membrane layer (4), covers copper layer (5), protective film (3) and finger (10), and being clipped between these layers is gluing layer (being also referred to as the ADH layer); The outboard end of described protective film (3) just in time contacts with the medial extremity in reverse side finger district (12).Comprise finger district (1) and flexible circuitry district (2) on the zone, described finger (10) is arranged on the positive and negative in finger district (1); On the traditional flexible circuit board of this kind, positive finger district (11) is concordant with the connecting line o of flexible circuitry district (2) intersection with reverse side finger district (12) with the connecting line o of flexible circuitry district (2) intersection, wherein the length a in positive finger district (11) is 4.5mm, reverse side finger district (12) b also is 4.5mm, the two is isometric, also is that both medial extremitys are concordant.
The traditional flexible circuit board of this kind in use; because positive finger is concordant with the reverse side finger; during bending; stress point appears at the diaphragm opening part; also promptly appear at the end that is connected of reverse side finger district and diaphragm, the diaphragm opening has gummosis after because of lamination, gummosis with electroplate otch of junction formation with difference in height; the two sides incision causes the phenomenon that fractures easily during bending, generally bends 1 time and just occurs phenomenon of rupture easily.
Summary of the invention
The flexible print circuit board that the purpose of this invention is to provide a kind of anti-bending overcomes traditional product and point the drawback that fracture takes place between district and the flexible circuitry district easily in the installation process.
The technical scheme that realizes the object of the invention is: a kind of bending-resistant flexible printed circuit board, comprise finger district and flexible circuitry district, and the positive and negative in described finger district is provided with finger; Stagger with the connecting line of flexible circuitry district intersection and the connecting line of reverse side finger district and flexible circuitry district intersection in the described positive district that points.
In the technique scheme, the outboard end in the finger district of described positive and negative is concordant, and the medial extremity in described positive finger district and the medial extremity in reverse side finger district stagger, and the two has length difference.
In the technique scheme, the medial extremity in described positive finger district and the length difference in reverse side finger district are 0.15 millimeter to 1.5 millimeters.
In the technique scheme, the finger in described positive finger district is longer than the finger in reverse side finger district.
In the technique scheme, the reverse side in described flexible circuitry district is provided with diaphragm, and the outboard end of described diaphragm contacts with the medial extremity in described reverse side finger district.
In the technique scheme, described positive finger district is 0.5 millimeter to 1.0 millimeters with the length difference in reverse side finger district.
The present invention has positive effect:
(1) among the present invention, stagger with the connecting line of flexible circuitry district intersection and the connecting line of described reverse side finger district and flexible circuitry district intersection in the described positive district that points, because the finger length of positive and negative is inequality, double-edged shear line is inequality when bending, has strengthened anti-bending performance.
(2) among the present invention, the finger in described positive finger district is longer than the finger in reverse side finger district; Especially the reverse side when described flexible circuitry district is provided with diaphragm; when the outboard end of described diaphragm contacts with the medial extremity in described reverse side finger district; this structure is because positive finger is longer than the reverse side finger; when bending; stress point is transferred to the front finger root, also promptly the medial extremity place is pointed in the front; owing to there is diaphragm support at the reverse side place, frangibility not, thus improved the bending number of times at finger place.
Description of drawings
Fig. 1 is the front view of traditional flexible circuit board;
Fig. 2 is the structural representation of traditional circuit plate shown in Figure 1;
Fig. 3 is the reverse view of traditional circuit plate shown in Figure 1;
Fig. 4 is a kind of front view of the present invention;
Fig. 5 is the cross-sectional view of bending-resistant flexible printed circuit board shown in Figure 4;
Fig. 6 is the reverse view of bending-resistant flexible printed circuit board shown in Figure 4.
Be labeled as shown in the accompanying drawing: finger district 1, flexible circuitry district 2, finger 10, positive finger district 11, reverse side finger district 12, diaphragm 3, basement membrane 4 covers copper layer 5.
Embodiment
(embodiment 1)
Fig. 4 to Fig. 6 has shown a kind of embodiment of the present invention, and wherein Fig. 4 is a kind of front view of the present invention; Fig. 5 is the cross-sectional view of bending-resistant flexible printed circuit board shown in Figure 4; Fig. 6 is the reverse view of bending-resistant flexible printed circuit board shown in Figure 4.
Present embodiment is a kind of bending-resistant flexible printed circuit board, comprises finger district 1 and flexible circuitry district 2, and the positive and negative in described finger district 1 is provided with finger 10; Stagger with the connecting line o of flexible circuitry district 2 intersections and the connecting line o of reverse side finger district 12 and flexible circuitry district 2 intersections in the described positive district 11 that points.The reverse side in described flexible circuitry district 2 is provided with diaphragm 3, and the outboard end of described diaphragm 3 contacts with the medial extremity in described reverse side finger district 12.
See shown in Figure 2ly, the outboard end in the finger district 1 of described positive and negative is concordant, and the medial extremity 111 in described positive finger district 11 staggers with the medial extremity 121 in reverse side finger district 12, and the two has length difference.In the present embodiment, the medial extremity in described positive finger district 11 and the length difference in reverse side finger district 12 are 0.9 millimeter, and the finger in described positive finger district 11 is longer than the finger in reverse side finger district 12.Specifically: the length in described positive finger district 11 is 5.4 millimeters, and the length b in reverse side finger district 12 is 4.5 millimeters.
In concrete practice, the length in described positive finger district 11 generally grows 0.15 millimeter to 1.5 millimeters than the length in reverse side finger district 12, and further preferable range is 0.5 millimeter to 1.0 millimeters.
Present embodiment has the following advantages:
(1) in the present embodiment, stagger with the connecting line of flexible circuitry district intersection and the connecting line of described reverse side finger district and flexible circuitry district intersection in the described positive district that points, because the finger length of positive and negative is inequality, double-edged shearing is subjected to the line of force inequality when bending, has strengthened anti-bending performance.
(2) in the present embodiment, the finger in described positive finger district is longer than the finger in reverse side finger district; Especially the reverse side when described flexible circuitry district is provided with diaphragm; when the outboard end of described diaphragm contacts with the medial extremity in described reverse side finger district; this structure is because positive finger is longer than the reverse side finger; when bending; stress point is transferred to the front finger root, also promptly the medial extremity place is pointed in the front; owing to there is diaphragm support at the reverse side place, frangibility not, thus improved the bending number of times at finger place.
Obviously, the above embodiment of the present invention only is for example of the present invention clearly is described, and is not to be qualification to embodiments of the present invention.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here need not also can't give exhaustive to all execution modes.And these belong to conspicuous variation or the change that connotation of the present invention extends out and still belong to protection scope of the present invention.
Claims (6)
1. a bending-resistant flexible printed circuit board comprises finger district (1) and flexible circuitry district (2), and the positive and negative in described finger district (1) is provided with finger (10); It is characterized in that: stagger with the connecting line of flexible circuitry district (2) intersection and the connecting line of reverse side finger district (12) and flexible circuitry district (2) intersection in the described positive district (11) that points.
2. bending-resistant flexible printed circuit board according to claim 1, it is characterized in that: the outboard end in the finger district (1) of described positive and negative is concordant, the medial extremity in the medial extremity in described positive finger district (11) and reverse side finger district (12) staggers, and the two has length difference.
3. bending-resistant flexible printed circuit board according to claim 2 is characterized in that: the length difference in the medial extremity in described positive finger district (11) and reverse side finger district (12) is 0.15 millimeter to 1.5 millimeters.
4. bending-resistant flexible printed circuit board according to claim 3 is characterized in that: the finger in described positive finger district (11) is longer than the finger in reverse side finger district (12).
5. bending-resistant flexible printed circuit board according to claim 4 is characterized in that: the reverse side in described flexible circuitry district (2) is provided with diaphragm (3), and the outboard end of described diaphragm (3) contacts with the medial extremity in described reverse side finger district (12).
6. bending-resistant flexible printed circuit board according to claim 5 is characterized in that: described positive finger district (11) is 0.5 millimeter to 1.0 millimeters with the length difference in reverse side finger district (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010111080A CN101778532A (en) | 2010-02-02 | 2010-02-02 | Bending-resistant flexible printed circuit board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010111080A CN101778532A (en) | 2010-02-02 | 2010-02-02 | Bending-resistant flexible printed circuit board |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101778532A true CN101778532A (en) | 2010-07-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010111080A Pending CN101778532A (en) | 2010-02-02 | 2010-02-02 | Bending-resistant flexible printed circuit board |
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| CN (1) | CN101778532A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102869186A (en) * | 2012-04-26 | 2013-01-09 | 宸阳光电科技（厦门）有限公司 | Connection structure for flexible printed circuit board and touch panel |
-
2010
- 2010-02-02 CN CN201010111080A patent/CN101778532A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102869186A (en) * | 2012-04-26 | 2013-01-09 | 宸阳光电科技（厦门）有限公司 | Connection structure for flexible printed circuit board and touch panel |
| CN102869186B (en) * | 2012-04-26 | 2015-07-29 | 宸阳光电科技（厦门）有限公司 | A kind of flexible print circuit board and touch screen syndeton |
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Application publication date: 20100714 |