TWM655887U - Flexible printed circuit board - Google Patents

Abstract

A flexible circuit board is used to solve the problem that the extension end of the circuit near the side edge of the circuit board is prone to bending or peeling. It includes: a substrate, the substrate has a first edge, a second edge and two side edges connected thereto, the surface of the substrate has a conductive area, the conductive area is close to the first edge; and a patterned circuit, located in the conductive area, the patterned circuit includes a plurality of sub-circuits arranged along the first edge, each sub-circuit includes a plurality of extended conductive circuits; among the plurality of sub-circuits, the sub-circuit whose distance from the side edge is less than or equal to a first distance further includes a protection circuit; the protection circuit has a second distance from the extension end of the plurality of conductive circuits. This can achieve the effect of reducing short circuits.

Description

Flexible circuit board

This invention relates to a circuit board, and more particularly to a flexible circuit board that can reduce bending or peeling of a line extension end near a side edge of the circuit board.

In the known flexible circuit board manufacturing process, the roll-to-roll process is often used for transmission. Specifically, the flexible substrate in the form of a belt is transmitted by the rotation of rollers, and the flexible substrate contains multiple flexible circuit boards or semi-finished flexible circuit boards. However, in the above transmission process, the two sides of the belt-shaped flexible substrate that are roughly parallel to the transmission direction are prone to friction with the transmission device. When the line width near the side edges of the two sides is small, it is easy to cause the extension end of the line near the side edges of the two sides in the manufactured flexible circuit board to bend or peel off, thereby causing a short circuit.

In view of this, the conventional flexible circuit boards still need to be improved.

To solve the above problems, the purpose of this invention is to provide a flexible circuit board that can reduce the bending or peeling of the extension end of the line near the side edge of the flexible circuit board.

The directions or similar terms described in the entire text of this work, such as "front", "back", "left", "right", "upper (top)", "lower (bottom)", "inside", "outside", "side", etc., are mainly for reference to the directions of the attached drawings. Each direction or similar terms are only used to assist in the description and understanding of the various embodiments of this work, and are not used to limit this work.

The quantifiers "one" or "a" used in the components and parts described in this work are only for the convenience of use and to provide the general meaning of the scope of this work; in this work, it should be interpreted as including one or at least one, and the concept of a single word also includes the plural case, unless it is obvious that it means otherwise.

The flexible circuit board of the invention comprises: a substrate having a first edge, a second edge substantially parallel to the first edge, and two side edges connecting the first edge and the second edge; a surface of the substrate comprising a conductive area, the conductive area being close to the first edge; and a patterned circuit located in the conductive area of the surface; the patterned circuit comprising a plurality of sub-circuits arranged along the first edge, each sub-circuit comprising a plurality of extended conductive circuits; among the plurality of sub-circuits, the sub-circuit having a distance from the side edge less than or equal to a first distance further comprises a protection circuit; the protection circuit has a second distance from the extended ends of the plurality of conductive circuits.

Accordingly, the flexible circuit board of this invention includes a protection circuit in the patterned circuit near the side edge of the flexible circuit board, which can reduce the direct friction between the conductive circuit in the patterned circuit and the transmission device, thereby reducing the bending or peeling of the extended end of the conductive circuit near the side edge of the flexible circuit board, thereby reducing short circuits.

The plurality of conductive lines are substantially parallel to each other on a side away from the first edge, and the protection line is substantially perpendicular to the plurality of conductive lines. Thus, the protection line can protect the extension ends of the plurality of conductive lines.

The first distance is 5±2mm. This has the effect of protecting the extended end of the conductive line near the side edge of the flexible circuit board.

The second distance is 0.025±0.005mm. In this way, it has the effect of both providing protection and avoiding non-ideal connection between the conductive line and the protective line.

The line width of the protection line is greater than the line width of the connection line. This has the effect of improving the protection effect.

The line width of the conductive line is less than or equal to 0.012 mm. This has the effect of reducing the size of the component.

The line width of the protection circuit is 0.025±0.005mm. This has the effect of improving the protection effect.

Among them, the shortest distance between two adjacent protection circuits is 0.02±0.005mm. In this way, it has the effect of both protection effect and avoiding non-ideal connection between two adjacent protection circuits.

The extension ends of the plurality of conductive lines are not connected to the protection line. This is beneficial to the flow of etching liquid or cleaning liquid during the etching process, and has the effect of improving the etching quality.

Among them, the extension end of one of the two conductive lines located on the outermost two sides of the sub-circuit is connected to the protection line. In this way, it has the effect of protecting the extension end of the conductive line close to the side edge of the flexible circuit board.

Among them, in the two adjacent sub-circuits, the conductive line connected to the protection line is located on the same side of the sub-circuits. In this way, it has the effect of protecting the extended end of the conductive line close to the side edge of the flexible circuit board.

Among the two adjacent sub-circuits, the conductive line connected to the protection line is located on different sides of the sub-circuits. In this way, it has the effect of protecting the extended end of the conductive line close to the side edge of the flexible circuit board.

1: Substrate

1a: Surface

11: The first edge

12: The second edge

13: Side edge

14: Conducting area

15: Transmission hole

2: Patterned circuit

2a: Sub-circuit

21: Conductive pad

22: Conducting lines

23: Protect the line

d1: first distance

d2: second distance

d3: third distance

X,Y: direction

W1: Line width

W2: Line width

A: Marking box

[Figure 1] A top view of a flexible circuit board of a preferred embodiment of this invention.

[Figure 2] A structural diagram of the first embodiment of the patterned circuit of the A part shown in Figure 1.

[Figure 3] A structural diagram of the second embodiment of the patterned circuit of the A part shown in Figure 1.

[Figure 4] A structural diagram of the third embodiment of the patterned circuit of the A part shown in Figure 1.

In order to make the above and other purposes, features and advantages of this creation more clearly understood, the following article specifically cites the preferred implementation examples of this creation and provides detailed descriptions with the attached drawings; in addition, the same symbols in different drawings are considered the same and their descriptions will be omitted.

Please refer to Figure 1, which is a preferred embodiment of the flexible circuit board of the present invention, comprising a substrate 1 and a patterned circuit 2, wherein the patterned circuit 2 is located on a surface of the substrate 1 near one side of an edge.

The substrate 1 has a first edge 11 and a second edge 12 along the X direction, and the first edge 11 and the second edge 12 are substantially straight lines and parallel to each other. The substrate 1 also has two side edges 13 connecting the first edge 11 and the second edge 12. A surface 1a of the substrate 1 has a conductive area 14, and the conductive area 14 is located on one side of the surface 1a close to the first edge 11.

The surface 1a may also include, for example, a chip placement area, a supporting metal area, or other conductive areas, etc., which are not limited by the present invention. The substrate 1 may also have a plurality of transmission holes 15, which are respectively located on the substrate 1 near the two side edges 13, and are used to cooperate with the transmission device to transmit the substrate 1.

The material of the substrate 1 can be polyimide (PI), polyethylene terephthalate (PET) or other appropriate soft insulating materials, and this invention is not limited to this.

Please refer to Figures 1 and 2. The patterned circuit 2 can be located in the conductive area 14. As shown in Figure 2, it is a first embodiment of the patterned circuit 2. The patterned circuit 2 includes a plurality of sub-circuits 2a. The plurality of sub-circuits 2a are arranged along the first edge 11 (that is, arranged along the X direction). Each sub-circuit 2a can include a plurality of conductive pads 21 and a plurality of conductive circuits 22. For example, each conductive pad 21 can be extended to form a conductive circuit 22. Other embodiments are also possible, and this invention is not limited thereto. The plurality of conductive lines 22 extend substantially in a direction away from the first edge 11 (i.e., extend in a Y direction perpendicular to the X direction) to form an extension end. Preferably, the plurality of conductive lines 22 are substantially parallel to each other, and the extension ends of the plurality of conductive lines 22 are substantially aligned in the Y direction.

The material of the patterned circuit 2 can be copper, nickel, gold and other metals or alloys, and can be set on the substrate 1 by etching process, which is not limited by this invention. The patterned circuit 2 can be a circuit used to test the manufacturing quality of the circuit board, but is not limited to this. The line width W1 of the conductive line 22 can be less than or equal to 0.012mm.

As shown in Figures 1 and 2, among the plurality of sub-circuits 2a arranged along the first edge 11, the sub-circuit 2a whose distance from the side edge 13 is less than or equal to a first distance d1 further includes a protection circuit 23. Preferably, the protection circuit 23 is substantially straight and has a second distance d2 from the extension ends of the plurality of conductive circuits 22. Preferably, the protection circuit 23 is substantially perpendicular to the plurality of conductive circuits 22. The protection circuit 23 can reduce direct friction between the conductive circuit 22 and the transmission device to protect the conductive circuit 22, thereby reducing bending or peeling of the extension end of the conductive circuit 22 near the side edge 13.

The material of the protection circuit 23 can be copper, nickel, gold and other metals or alloys, and can be set on the substrate 1 by etching process, and this invention is not limited. The line width W2 of the protection circuit 23 can be greater than the line width W1 of the conductive line 22, and the line width W2 of the protection circuit 23 is preferably 0.025±0.005mm, thereby improving the protection effect.

The first distance d1 is preferably 5±2 mm, so that the extension ends of the plurality of conductive lines 22 near the side edge 13 can be reduced from bending or peeling, thereby reducing short circuits.

The second distance d2 is preferably 0.025±0.005mm, so that the protection circuit 23 can be prevented from being too far away from the extension end of the conductive circuit 22, resulting in insufficient protection effect; and the protection circuit 23 can be prevented from being too close to the extension end of the conductive circuit 22, resulting in incomplete etching during the etching process, resulting in non-ideal connection between the plurality of conductive circuits 22 and the protection circuit 23, thereby causing a short circuit.

As shown in Figure 2, the shortest distance between two adjacent protection circuits 23 is a third distance d3, and the third distance d3 is preferably 0.02±0.005mm. In this way, it is possible to avoid the two adjacent protection circuits 23 being too close to each other and incomplete etching during the etching process, resulting in an undesirable connection between the two adjacent protection circuits 23, thereby affecting the flow of etching liquid or cleaning liquid during the etching process and affecting the etching quality; and it is possible to avoid the protection circuit 23 being too short and causing insufficient protection effect.

As shown in FIG. 2, in the first embodiment, the extension ends of the plurality of conductive lines 22 are not connected to the protection line 23, that is, the protection line 23 is a dummy line. This facilitates the flow of etching liquid or cleaning liquid during the etching process.

Please refer to FIG. 3, which is a second embodiment of the patterned circuit 2. This embodiment is roughly the same as the first embodiment described above. In this embodiment, one of the two conductive circuits 22 located on the outermost sides of the sub-circuit 2a has an extended end connected to the protection circuit 23; that is, one of the two conductive circuits 22 located on the outermost sides can form an L-shape or an inverted L-shape. In addition, the conductive circuits 22 connected to the protection circuit 23 of the two adjacent sub-circuits 2a are located on the same side of the sub-circuit 2a, and the third distance d3 between the two adjacent protection circuits 23 can also be 0.02±0.005mm.

Please refer to FIG. 4, which is a third embodiment of the patterned circuit 2. This embodiment is substantially the same as the second embodiment described above. In this embodiment, in two adjacent sub-circuits 2a, the conductive circuit 22 connected to the protection circuit 23 is located on different sides of the sub-circuits 2a. And the third distance d3 between the two adjacent protection circuits 23 can also be 0.02±0.005mm.

It is worth mentioning that the aforementioned first embodiment in which the extension ends of the plurality of conductive lines 22 are not connected to the protection line 23, the second embodiment in which the conductive lines 22 connected to the protection line 23 in two adjacent sub-circuits 2a are located on the same side, and the third embodiment in which the conductive lines 22 connected to the protection line 23 in two adjacent sub-circuits 2a are located on different sides can also be combined with each other; that is, the patterned circuit 2 can also include the sub-circuit 2a forms of the first embodiment, the second embodiment or the third embodiment at the same time.

In summary, the flexible circuit board of the present invention includes a protection circuit in the patterned circuit near the side edge of the flexible circuit board, which can reduce the direct friction between the conductive circuit in the patterned circuit and the transmission device, thereby reducing the bending or peeling of the extended end of the conductive circuit near the side edge of the flexible circuit board, thereby reducing short circuits.

Although this creation has been disclosed using the above preferred embodiments, they are not used to limit this creation. Any person familiar with this art can make various changes and modifications to the above embodiments within the spirit and scope of this creation, and they are still within the technical scope protected by this creation. Therefore, the protection scope of this creation should include all changes within the meaning and equivalent scope recorded in the attached patent application scope. In addition, when the above several embodiments can be combined, this creation includes any combination of implementations.

2: Patterned circuit

2a: Sub-circuit

21: Conductive pad

22: Conducting lines

23: Protect the line

d2: second distance

d3: third distance

W1: Line width

W2: Line width

X,Y: direction

Claims (12)

A flexible circuit board comprises: a substrate having a first edge, a second edge substantially parallel to the first edge, and two side edges connecting the first edge and the second edge; a surface of the substrate comprising a conductive area, the conductive area being close to the first edge; and a patterned circuit located in the conductive area of the surface; the patterned circuit comprising a plurality of sub-circuits arranged along the first edge, each sub-circuit comprising a plurality of extended conductive circuits; among the plurality of sub-circuits, the sub-circuit having a distance from the side edge less than or equal to a first distance further comprises a protection circuit; the protection circuit has a second distance from the extended ends of the plurality of conductive circuits. A flexible circuit board as claimed in claim 1, wherein the plurality of conductive lines are substantially parallel to each other on a side away from the first edge, and the protection line is substantially perpendicular to the plurality of conductive lines. A flexible circuit board as claimed in claim 1, wherein the first distance is 5±2 mm. A flexible circuit board as claimed in claim 1, wherein the second distance is 0.025±0.005 mm. A flexible circuit board as claimed in claim 1, wherein the line width of the protection line is greater than the line width of the conductive line. A flexible circuit board as claimed in claim 1, wherein the line width of the conductive line is less than or equal to 0.012 mm. For example, in the flexible circuit board of claim 1, the line width of the protection line is 0.025±0.005mm. For example, in the flexible circuit board of claim 1, the shortest distance between two adjacent protection circuits is 0.02±0.005mm. A flexible circuit board as claimed in claim 1, wherein the extension ends of the plurality of conductive lines are not connected to the protection line. A flexible circuit board as claimed in claim 1, wherein, among the two conductive lines located on the outermost sides of the sub-circuit, an extended end of one of the conductive lines is connected to the protection line. As in claim 10, the flexible circuit board, wherein in two adjacent sub-circuits, the conductive line connected to the protection line is located on the same side of the sub-circuits. As in claim 10, the flexible circuit board, wherein in two adjacent sub-circuits, the conductive line connected to the protection line is located on different sides of the sub-circuits.

Images