TWI461115B - Flexible printed circuit board - Google Patents

Description

Flexible circuit board

The present invention is a flexible circuit board, and more particularly to a flexible circuit board having a buffer.

Due to the rapid development of global information and communication products, the market for printed circuit boards (PCBs) has also been promoted, and the flexible printed circuit (FPC) is now the mainstream of many electronic products.

Flexible boards are used in small portable systems that require thin, light and short substrates, such as folding phones, notebooks, watches and hearing aids, and applications such as electronic medical products. In addition, recent soft electronic applications have been extended to radio frequency identification (RFID) tags and optoelectronic components.

However, there are some design limitations when using a flexible circuit board. For example, the size of a flexible circuit board and the area of a copper pad are larger than those of a rigid printed circuit board (PCB). Second, special solder pieces must be fabricated. Stacking, otherwise copper may leave the dielectric layer; further, at the edge of the flexible circuit board, if the reserved space is insufficient, it will cause the layer to peel off between layers and thus affect. In addition, when the flexible circuit board is bent, the deformation of the flexible circuit board may cause the circuit to be damaged, which may cause the liquid crystal display module of the application to display abnormality. Therefore, the development of the technology that solves the above problems is the direction in which the industry wants to develop.

In view of the above, the present invention provides a flexible circuit board comprising: a main body portion, wherein an electronic component is disposed; a joint portion coupled to the connector; and a connecting portion, the two ends of which respectively connect the main body portion and the joint portion, wherein the joint portion includes a buffer Zone and stress concentration zone. Wherein, the buffer zone is located between the stress concentration zone and the joint portion, and the stress concentration zone is located between the buffer zone and the body portion.

In the flexible circuit board of the present invention, the buffer zone is a single layer board. When the flexible circuit board is connected to the connector, the intersection of the flexible circuit board and the connector is easy to be arched. If a buffer layer of a single-layer board structure is disposed at the intersection, the intersection becomes a softer area. , can avoid the problem of arching when the flexible circuit board is connected to the connector.

In addition, the flexible circuit board provided by the invention has a stress concentration region of a plurality of layers, and utilizes the strength of the multi-layer structure to enhance the strength of the strain. When the flexible circuit board is coupled to the connector, the connecting portion of the flexible circuit board is subjected to an external force to generate stress, so that the connecting portion is deflected, thereby being easily strained and damaged. Therefore, a stress concentration region is provided at the connecting portion to increase the turning point. In addition, since the connecting portion has a buffer at the intersection of the flexible circuit board and the connector, the position where the maximum stress is applied occurs in the buffer zone, so that the stress that the above-mentioned turning may be suffered can be reduced, thereby avoiding the turning. When the damage is made and the joint is connected to the circuit control board, the signal transmission function can be achieved, so that the circuit board can operate normally.

The detailed features and advantages of the present invention are set forth in the Detailed Description of the Detailed Description of the <RTIgt; </ RTI> <RTIgt; </ RTI> </ RTI> </ RTI> <RTIgt; The objects and advantages associated with the present invention can be readily understood by those skilled in the art.

Referring to Figures 1, 2 and 3A, the flexible circuit board 1 disclosed in the first embodiment of the present invention includes a main body portion 10, a joint portion 11 and a joint portion 12, wherein the above flexible circuit The board 1 can be applied to an automobile dashboard, a lamp, an LED lighting or a backlight module of a display.

The electronic component 13 is disposed on the main body 10, and the electronic component 13 is preferably a light emitting diode (LED). The above is only an example, but not limited thereto.

The joint portion 11 is coupled to a connector 14, and the connector 14 is coupled to a circuit control board 15, thereby achieving the function of signal transmission.

The connecting portion 12 has two ends connected to the main body portion 10 and the joint portion 11, and the connecting portion 12 includes a buffer zone 121 and a stress concentration region 123. The buffer zone 121 is located between the stress concentration region 123 and the joint portion 11 , and the stress concentration region 123 is located between the buffer zone 121 and the main body portion 10 . In addition, the stress concentration region 123 further includes a turn 1231, and the turn 1231 includes one of a rounded corner (R angle), an obtuse angle, or an acute angle.

In general, when a material cannot be displaced by an external force, its geometry and size will change. This deformation is called strain. When the material is deformed, the internal will produce equal-sized but opposite-direction reaction forces to resist external forces, and this reaction force is stress.

As described above, while the flexible circuit board 1 is being assembled to the connector 14, the connecting portion 12 is required to be pulled by an external force and coupled to the connector 14, and when the connecting portion 12 is subjected to an external force, the connecting portion 12 is simultaneously A stress opposite to the external force is generated internally, and the stress is concentrated in the turning 1231 of the joint portion 12, that is, in the stress concentration region 123. Therefore, a buffer zone 121 is disposed on the connecting portion 12 for buffering the stress applied to the stress concentration region 123, thereby preventing the connecting portion 12 from being strained and damaged due to stress, thereby affecting the conduction of the circuit board. The electronic component 13 provided in the main body 10 is rendered inoperable.

In a preferred embodiment of the first embodiment, the buffer zone 121 is a single-layer plate body, and the stress concentration area 123 is a plurality of layer plates, as shown in FIGS. 10, 11 and 12, wherein x is a base layer, The base layer is an insulating substrate, preferably Polyester (PET) or Polyimide (PI); y and y' are copper conductor layers; z and z' are cover layers. The above structure or material is merely an example, and the present invention is not limited thereto.

The buffer zone 121 is designed as a single-layer plate body for forming a relatively soft region, and the stress concentration region 123 is set as a plurality of plate bodies for improving the structural strength thereof, and the joint portion 12 is subjected to an external force and generated. The stress of the resistance, due to the design of the buffer zone 121 and the stress concentration zone 123, will cause the stress to concentrate in the buffer zone 121, thereby preventing the transition 1231 of the stress concentration zone 123 from directly suffering from excessive stress and causing fracture. The phenomenon, and in turn, avoids the problem of arching when the flexible circuit board 1 is attached to the connector 14.

As described above, the buffer portion 121 of the plurality of layers is disposed in the connecting portion 12, and the structural strength of the single-layer plate body of the buffer region 121 is utilized, so that the connecting portion 12 is less susceptible to stress and deformation, thereby preventing the circuit from being damaged. When the joint portion 11 is coupled to the circuit control board 15, the function of signal transmission can be achieved, so that the circuit board can operate normally.

3A to 8 are flexible circuit boards 1 according to a second embodiment of the present invention. The connecting portion 12 of the flexible circuit board 1 can have various shapes, and the buffer zone 121 and the stress concentration area 123 are directed to the connecting portion 12. The shape, considering the position of the turning 1231, and further designing the position distribution of the buffer zone 12 and the stress concentration zone 123, wherein the 3A and 3B drawings: the connecting portion 12 is an L-shaped; and the fourth drawing: the connecting portion 12 is a linear type; Fig. 5: The connecting portion 12 is a single-shaped type; the sixth drawing: the connecting portion 12 is a Y-shaped type; the seventh drawing: the connecting portion 12 is an inverted Y-shape; and the eighth drawing: the connecting portion 12 is a U-shaped type.

The buffer zone 121 shown above should be located between the stress concentration zone 123 and the joint portion 11, and the stress concentration zone 123 must cover the turn 1231 to enhance the strength of the transition 1231 to withstand stress. The position and area width of the buffer zone 121 and the stress concentration zone 123 of the present embodiment are merely examples, and the present invention is not limited thereto.

On the other hand, the main body 10 can also include a structure of a plurality of layers, as shown in FIG. 9, for increasing the overall structural strength of the main body 10 and the joint portion 12, and the plurality of layers of the main body portion 10 are The position or area width is only an example, and the invention is not limited thereto.

According to the above, the stress concentration region 123 provided in the connection portion 12 of the flexible circuit board 1 of the present invention is a structure of a plurality of layers, and can increase the strength of the connection portion 12 to withstand stress, and further, the connection portion 12 The buffer zone 121 is designed as a single-layer board structure, and the joint portion 11 is prevented from arching the connector 14, thereby improving the circuit damage caused by the combination of the flexible circuit board 1 and the connector 14 of the circuit board 15. To improve the overall effectiveness of the flexible circuit board.

The flexible circuit board 1 disclosed in the second embodiment of the present invention includes a main body portion 10, a joint portion 11, and a joint portion 12, as shown in Fig. 5.

The electronic component 13 is disposed on the main body 10, and the electronic component 13 is preferably a light emitting diode (LED). The above is only an example, but not limited thereto.

The joint portion 11 is coupled to a connector 14, and the connector 14 is coupled to a circuit control board 15, thereby achieving the function of signal transmission.

The connecting portion 12 has two ends connected to the main body portion 10 and the joint portion 11 respectively. The connecting portion 12 includes at least two stress concentration regions 123 and a buffer zone 121, wherein the at least two stress concentration regions 123 are respectively located at the joint portion 12 On both sides, at least one side of the buffer zone 121 is adjacent to the stress concentration zone 123. In addition, the stress concentration region 123 further includes a turn 1231, and the turn 1231 includes one of a rounded corner (R angle), an obtuse angle, or an acute angle.

In a preferred embodiment of the third embodiment, the buffer zone 121 includes a single layer of plates, and the stress concentration zone 123 includes a plurality of layers.

A flexible circuit board 1 according to a fourth embodiment of the present invention includes a main body portion 10, a joint portion 11, a joint portion 12, and a covering member 16, as shown in Fig. 13.

The electronic component 13 is disposed on the main body 10, and the electronic component 13 is preferably a light emitting diode (LED). The above is only an example, but not limited thereto.

The joint portion 11 is connected to a connector 14, and the connector 14 is connected to a circuit control board 15, thereby achieving the function of signal transmission.

The connecting portion 12 has two ends connected to the main body portion 10 and the joint portion 11 respectively. The connecting portion 12 includes at least one stress concentration region 123. The stress concentration region 123 further includes a turning portion 1231. The turning portion 1231 includes a round corner (R angle). One of the obtuse or acute angles.

The covering member 16 is located on the surface of the connecting portion 12, and the covering member 16 can extend from the connecting portion 12 to the main body portion 10 on the surface of the main body portion 10, and is located between the electronic components 13, such as the 13th and 14th. The figure shows. The cover material 16 is preferably an adhesive tape, and the type of the cover material is merely an example, and the invention is not limited thereto.

Furthermore, the connecting portion 12 includes a first surface 12a and a second surface 12b. Wherein, the covering material 16 can be located on the first surface 12a together with the electronic component 13. However, the covering material 16 can extend from the first surface 12a to the second surface 12b, as shown in Figures 15A and 15B. Show.

The cladding material 16 must cover the stress concentration region 123. During the assembly of the flexible circuit board 1 to the connector 14, the cladding material 16 can absorb and buffer the stress experienced by the stress concentration region 123 of the connecting portion 12. Thereby, the connection portion 12 is prevented from being damaged by the stress caused by the transition 1231, thereby affecting the conduction of the circuit board, and the electronic component 13 provided in the main body 10 cannot be operated smoothly. However, the position of the covering material 16 of the present embodiment is merely an example, and the present invention is not limited thereto.

In addition, the covering material 16 is an adhesive tape, and the flexible circuit board 1 can be adhered and fixed to a pedestal (not shown). Therefore, the covering material 16 disclosed in the embodiment not only has the function of sticking and fixing. And has the function of protecting the buffer, and avoids the damage of the turning 1231 of the joint portion 12 due to the stress. The pedestal is preferably a pedestal of the backlight module, and the pedestal is only an example, and the invention is not limited thereto.

Although the technical content of the present invention has been disclosed in the above preferred embodiments, it is not intended to limit the present invention, and any modifications and refinements made by those skilled in the art without departing from the spirit of the present invention are encompassed by the present invention. The scope of protection of the present invention is therefore defined by the scope of the appended claims.

1. . . Flexible circuit board

10. . . Main body

11. . . Joint

12. . . Linkage

12a. . . First side

12b. . . Second side

121. . . Buffer

123. . . Stress concentration zone

1231. . . Turn

13. . . Electronic component

14. . . Connector

15. . . Circuit control board

16. . . Covering material

FIG. 1 is a schematic diagram of a flexible circuit board according to a first embodiment of the present invention.

FIG. 2 is a schematic diagram showing the connection between a flexible circuit board and a connector according to the first embodiment of the present invention.

3A to 8 are schematic views showing various aspects of a joint portion in a flexible circuit board according to a second embodiment of the present invention.

FIG. 9 is a schematic view showing a flexible circuit board according to a second embodiment of the present invention, wherein the main body portion includes a plurality of layers.

FIG. 10 is a schematic structural view of a plurality of layers of a stress concentration zone according to a first embodiment of the present invention;

Figure 11 is a schematic view showing the structure of a single-layer board of the buffer zone disclosed in the first embodiment of the present invention.

Figure 12 is a cross-sectional view showing the connection buffer zone of the stress concentration zone disclosed in the first embodiment of the present invention.

13 to 15A and 15B are schematic views of a flexible circuit board according to a fourth embodiment of the present invention.

1. . . Flexible circuit board

10. . . Main body

11. . . Joint

12. . . Linkage

121. . . Buffer

123. . . Stress concentration zone

1231. . . Turn

13. . . Electronic component

Claims (20)

A flexible circuit board comprising: a main body portion, an electronic component; an engaging portion coupled to a connector; and a connecting portion, the two ends of which respectively connect the main body portion and the engaging portion, the connecting portion comprising: a buffer zone, the buffer zone is a single-layer plate body; and a stress concentration zone is located between the buffer zone and the main body portion, and the buffer zone is located between the stress concentration zone and the joint portion, and the stress concentration zone is a plurality of layers, wherein stress is concentrated in the stress concentration region when the joint is subjected to an external force, and the buffer is used to buffer stress in the stress concentration region. The flexible circuit board of claim 1, wherein the stress concentration zone comprises a turn. A flexible circuit board as claimed in claim 2, wherein the transition comprises one of a rounded corner (R angle), an obtuse angle or an acute angle. The flexible circuit board of claim 1, wherein the electronic component comprises a light emitting diode. The flexible circuit board of claim 1, wherein the connector is for connecting to a circuit control board. A flexible circuit board comprising: a main body portion provided with an electronic component; a joint portion provided with a connector; and a connecting portion, the two ends of which respectively connect the main body portion and the joint portion, and the joint portion includes at least two a stress concentration zone and a buffer zone, wherein the at least two stress concentration zones are respectively located on two sides of the joint portion, the buffer zone is located between the stress concentration zone and the joint portion, and at least one side of the buffer zone is adjacent to the stress concentration a zone, wherein the buffer zone is a single-layer plate, and each of the stress concentration zones is a plurality of layers. The flexible circuit board of claim 6, wherein each stress concentration zone comprises a turn. A flexible circuit board as claimed in claim 7, wherein the transition comprises one of a rounded corner (R angle), an obtuse angle or an acute angle. The flexible circuit board of claim 6, wherein the electronic component comprises a light emitting diode. The flexible circuit board of claim 6, wherein the connector is for connecting to a circuit control board. A flexible circuit board comprising: a main body portion configured with an electronic component; a joint portion connected to a connector; a connecting portion, the two ends of which respectively connect the main body portion and the joint portion, the joint portion including a stress concentration And a buffer zone between the stress concentration zone and the joint portion, wherein the buffer zone is a single-layer plate body, and the stress concentration zone is a plurality of layer plates; and a cladding material is located at the a joint portion, and the covering material covers the stress concentration region. The flexible circuit board of claim 11, wherein the covering material extends from the joint portion to the main body portion and is located on a surface of the main body portion. A flexible circuit board as claimed in claim 12, wherein the cladding material is located between the electronic components. The flexible circuit board of claim 11, wherein the stress concentration zone comprises a turn. A flexible circuit board as claimed in claim 14, wherein the transition comprises one of a rounded corner (R angle), an obtuse angle or an acute angle. In the flexible circuit board of claim 11, the covering material comprises an adhesive tape. The flexible circuit board of claim 11, wherein the connecting portion comprises a first surface and a second surface, and the cladding material and the electronic component are located on the first surface. The flexible material of claim 17, the cladding material extending from the first side to the second side. The flexible circuit board of claim 11, wherein the electronic component comprises a light emitting diode. The flexible circuit board of claim 11, wherein the connector is for connecting to a circuit control board.