Rigid-flex circuit board and electric connection device

Abstract

A rigid-flex circuit board and an electric connection device, the rigid-flex circuit board comprises a soft board, a hard board pressed at one end of the soft board and a limiting buckle, an electric connection element is arranged on the hard board, the hard board is also provided with a bonding pad group, and the bonding pad group comprises a plurality of bonding pads; a connecting part is arranged at the end part of one side of the flexible board, golden fingers are arranged on the connecting part, and the golden fingers and the bonding pad groups are arranged in a one-to-one correspondence manner; the limiting buckle comprises a mounting part and a limiting part, limiting columns are arranged on the two opposite outer side edges of the mounting part and embedded in the hard board, a mounting hole is formed in the limiting part and penetrates through the limiting buckle in the extending direction of the limiting buckle, and the top face of the limiting part is flush with the top face of the mounting part; and an adhesive layer is arranged between the limiting part and the solder mask layer and is filled between the limiting part and the solder mask layer. According to the utility model, the limiting buckle is arranged to reinforce and limit the joint of the hard board and the soft board, so that the hard board and the soft board are combined more stably, the golden finger can be protected, and the practicability is high.

Description

TECHNICAL FIELD

[0001] The utility model relates to circuit board technical field, concretely relates to a rigid and flexible combination circuit board and electric connection device. BACKGROUND

[0002] The birth and development of FPC (soft board) and PCB (hard board) have given birth to a new product, rigid-flexible combination board. The rigid-flexible combination board is a flexible circuit board and a hard circuit board, which are combined together according to relevant process requirements through pressing and other processes, and form a circuit board with the characteristics of FPC and PCB. It can be folded, bent and reduce space, and can also be welded with complex components. Compared with the wire, it has a longer service life, more reliable stability, is not easy to break and oxidize and fall off, and is very helpful to improve product performance.

[0003] However, as more and more parts and functions are integrated on the PCB, the conductive PAD is also more and more, and the PCB is becoming narrower and narrower, so that the PAD design is also more and more narrow and insufficient in space. As a result, the contact surface of the FPC gold finger and the PAD becomes smaller, the bonding force between the two becomes weaker, and when the FPC is turned over during use, it may directly act on the bonding position, thereby there is a risk of easy loosening. And there is a risk of easy breakage of the FPC gold finger during the bending process of the FPC. UTILITY MODEL CONTENTS

[0004] Therefore, the purpose of the utility model is to provide a rigid-flexible combination circuit board and an electric connection device to solve the problems in the background art.

[0005] A rigid-flexible combination circuit board comprises a soft board, a hard board pressed on one end of the soft board and a limiting buckle, the electric connection element is arranged on the hard board, a solder pad group is further arranged on the hard board, and the solder pad group comprises a plurality of solder pads; one side end of the soft board is provided with a connecting part, a gold finger is arranged on the connecting part, and the gold finger and the solder pad group are arranged in one-to-one correspondence; the limiting buckle comprises a mounting part and a limiting part, limiting columns are arranged on the two opposite outer sides of the mounting part, the limiting columns are embedded in the hard board, an installation hole is arranged on the limiting part, the installation hole penetrates in the extension direction of the limiting buckle, and the top surface of the limiting part is flush with the top surface of the mounting part; a glue layer is further arranged between the limiting part and the solder resist layer, and the glue layer is filled between the two.

[0006] Further, the soft board comprises a first board body and a second board body, the second board body is arranged on the first board body, and the length of the first board body is greater than that of the second board body.

[0007] Further, the first board body is provided with a bending part on the outer side of the second board body, and the connecting part is arranged on the outer side of the bending part.

[0008] Further, the bottom surface of the gold finger is provided with a conductive layer, the bending part is provided with a solder mask layer corresponding to the area of the conductive layer, and the conductive layer is connected to the second plate body through an inner layer circuit.

[0009] Further, the hard plate is provided with a windowed area, the thickness of the windowed area is less than that of other areas, and the pad area is located in the windowed area.

[0010] Further, the length of the gold finger is longer than that of the pad, and the outer side end of the limiting buckle extends outward from the rear side end of the gold finger.

[0011] Further, the limiting part comprises a top frame and a bottom plate, the top frame is arranged in an L-shaped manner, the bottom plate is connected to the bottom end surfaces of the two sides of the top frame at one end of the mounting part, and the bottom plate is separately arranged from the top frame away from one end of the mounting part.

[0012] Further, the limiting part is connected to the hole of the hard plate through a screw or through soldering.

[0013] Further, the hole diameter of the mounting hole is consistent with or larger than the end section of the soft plate connecting part.

[0014] An electric connection device with a rigid-flexible combined circuit board comprises a rigid-flexible combined circuit board and an electric connection element, the rigid-flexible combined circuit board is the rigid-flexible combined circuit board mentioned above, the electric connection element is arranged on the hard plate, the electric connection element and the pad are respectively arranged on the opposite sides and are electrically connected.

[0015] In summary, the gold finger longer than the pad is arranged, the fullness of the combination of the pad and the gold finger is improved, the combination of the hard plate and the soft plate is reinforced and limited by the limiting buckle, the combination between the two is more stable, and the gold finger is protected, the practicability of the electric connection device with the rigid-flexible combined circuit board is strong, and the electric connection device with the rigid-flexible combined circuit board has strong popularization significance. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a structural schematic view of the electric connection device with the rigid-flexible combined circuit board of the utility model;

[0017] Figure 2 It is Figure 1 It is an exploded view of the rigid-flexible combined circuit board;

[0018] Figure 3 It is a partial cross-sectional view of the rigid-flexible combined circuit board;

[0019] Figure 4 It is a structural schematic view of the limiting buckle;

[0020] Figure 5 It is a structural schematic view of the limiting buckle in the second embodiment. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the utility model more clearly, the following will make further detailed description to the utility model combined with the drawings and examples. It should be understood that the specific examples described here are only used to explain the utility model, and are not used to limit the utility model.

[0022] As Figures 1 to 4 shown, it is an electric connection device with rigid-flex circuit board provided by the utility model, the electric connection device with rigid-flex circuit board includes rigid-flex circuit board and electric connection element 100, the rigid-flex circuit board includes soft board 10, hard board 20 pressed in one end of soft board 10 and limit buckle 30, the electric connection element 100 is arranged on hard board 20, and the limit buckle 30 is further limited to the connecting place of soft board 10 and hard board 20. In the embodiment, the electric connection element 100 is a connecting terminal.

[0023] The hard board 20 is further provided with pad group 21, and the pad group 21 includes a plurality of pads; the pad group 21 is arranged on the opposite side of the electric connection element 100. In the embodiment, the hard board 20 is in a long strip shape and has a relatively narrow width. One side end of the soft board 10 is provided with a connecting part 11, and the connecting part 11 is provided with a gold finger 12, and the gold finger 12 is correspondingly arranged with the pad group 21. In addition, in the embodiment, the length of the gold finger 12 is slightly longer than the length of the pad, and the pad is relatively short due to the width limitation of the hard board, and the length of the gold finger 12 is longer, so that when the soft board 10 has an excess part towards the hard board 20, the pad and the gold finger can still be fully connected.

[0024] The soft board 10 includes a first plate body 13 and a second plate body 14, the second plate body 14 is arranged on the first plate body 13, and the length of the first plate body 13 is greater than that of the second plate body 14. The first plate body 13 is provided with a bending part 15 on the outside of the second plate body 14, and the connecting part 11 is arranged on the outside of the bending part 15. The bottom surface of the gold finger 12 is provided with a conductive layer 16, the bending part 15 is provided with a solder resist layer 17 corresponding to the area of the conductive layer 16, and the conductive layer 16 is connected to the second plate body 14 through a connecting circuit 18. The built-in connecting circuit 18 reduces the risk of oxidation, scratching and the like.

[0025] The limiting buckle 30 includes a mounting part 31 and a limiting part 32. Limiting posts 311 are provided on two opposite outer edges of the mounting part 31, and the limiting posts 311 are embedded within the rigid plate 20. Further, the limiting posts 311 can also be locked with screws or soldered into holes in the rigid plate 20. The limiting part 32 has a mounting hole 321 that extends along the extending direction of the limiting buckle 30, and the top surface of the limiting part 32 is flush with the top surface of the mounting part 31. In this embodiment, the diameter of the mounting hole 321 is the same as or slightly larger than the end cross-section of the flexible plate 10 connecting part 11.

[0026] An adhesive layer 33 is also provided between the limiting part 32 and the solder resist layer 17, filling the space between them. Furthermore, the rigid board 20 has a window area 22, which forms a concave structure, and the solder pad group 21 is located within the window area 22. During installation, the connecting part 11 of the flexible board 10 is inserted into the window area 22 through the mounting hole 321 until its end abuts against the inner wall of the corresponding window area 22. It is then placed in a hot-pressing device (existing conventional equipment, the specific structure of which is not described in detail) for hot-pressing welding, connecting the gold fingers 12 to the corresponding solder pads. In this embodiment, the adhesive layer 33 is a prepreg; during the hot-pressing process, the prepreg melts and bonds, filling the space between the limiting buckle 30, the solder resist layer 17, and the gold fingers 12. Therefore, during use, the limiting buckle 30 not only partially limits the rigid board 20 and the flexible board 10, but also protects the tail end of the gold finger 12, preventing it from breaking due to excessive length. The tail end of the limiting buckle 30, combined with the adhesive layer 33, fixes the flexible board 10. Thus, when the flexible board 10 is bent, the bending force acts on the outer adhesive point, not directly on the soldering point between the gold finger 12 and the pad, reducing the bending force on the gold finger and lowering the probability of loosening and breakage.

[0027] like Figure 5 As shown, this is the second embodiment of the present invention. The structure of this embodiment is basically the same as that of the first embodiment, except that the limiting part 32 includes a top frame 323 and a bottom plate 322. The top frame 323 is U-shaped, and the bottom plate 322 is connected to the bottom surfaces of both sides of the top frame 323 at one end of the mounting part 31. The end of the bottom plate 322 away from the mounting part 31 is separated from the top frame 323. During the hot pressing process, when pressing at this position, the bottom plate 322 and the top frame 323 will move closer to each other to a certain extent, which reduces the diameter of the mounting hole 321 at this end, thereby allowing the adhesive layer 33 to be filled more fully and improving the stability of the bonding and limiting.

[0028] In summary, the utility model discloses through setting the gold finger of long in the welding tray, has improved the fullness of the welding tray and the gold finger combination, through setting the limiting buckle is reinforced to the joint of hard board and soft board and is positioned, not only makes the combination between both more stable, and can play the protection function to the gold finger, the utility model has strong practicality, has strong popularization significance.

[0029] The above-mentioned embodiments only express two kinds of implementation manners of the utility model, and the description is more specific and detailed, but can not be understood as the limitation of the utility model patent scope. It should be pointed out that for ordinary skilled person in the art, without departing from the concept of the utility model, a number of modifications and improvements can be made, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent should be subject to the appended claims.

Claims

1. A rigid-flex combined circuit board, characterized by: The application relates to a soft board, a hard board and a limiting buckle, wherein the hard board is arranged at one end of the soft board, the hard board is provided with electric connecting elements, and the hard board is further provided with a solder pad group, the solder pad group comprises a plurality of solder pads, one side end of the soft board is provided with a connecting part, the connecting part is provided with a gold finger, the gold finger is arranged in one-to-one correspondence with the solder pad group, the limiting buckle comprises a mounting part and a limiting part, limiting columns are arranged on two opposite outer sides of the mounting part, the limiting columns are embedded in the hard board, the limiting part is provided with a mounting hole, the mounting hole penetrates the limiting buckle along the extending direction of the limiting buckle, the top surface of the limiting part is flush with the top surface of the mounting part, a glue layer is further arranged between the limiting part and a solder resist layer, and the glue layer is filled between the limiting part and the solder resist layer.

2. The rigid-flex circuit board of claim 1, wherein: The soft board comprises a first plate body and a second plate body, the second plate body is arranged on the first plate body, and the length of the first plate body is greater than that of the second plate body.

3. The rigid-flex circuit board of claim 2, wherein: The first plate body is provided with a bending part on the outer side of the second plate body, and the connecting part is arranged on the outer side of the bending part.

4. The rigid-flex circuit board of claim 3, wherein: The bottom surface of the gold finger is provided with a conductive layer, the bending part is provided with a solder resist layer corresponding to the area of the conductive layer, and the conductive layer is connected to the second plate body through an inner layer circuit.

5. The rigid-flex combined circuit board of claim 1, wherein: The hard board is provided with a windowed area, the thickness of the windowed area is less than that of other areas, and the solder pad group is arranged in the windowed area.

6. The rigid-flex combined circuit board of claim 1, wherein: The length of the gold finger is greater than that of the solder pad, and the outer side end of the limiting buckle extends outward from the rear side end of the gold finger.

7. The rigid-flex circuit board of claim 1, wherein: The limiting part comprises a top frame and a bottom plate, the top frame is arranged in an L shape, the bottom plate is connected to the bottom end surfaces of the two sides of the top frame at one end of the mounting part, and the bottom plate is arranged separately from the top frame at the end far from the mounting part.

8. The rigid-flex circuit board of claim 1, wherein: The limiting part is locked in the hole of the hard board through a screw or is connected to the hole of the hard board through soldering.

9. The rigid-flex circuit board of claim 1, wherein: The hole diameter of the mounting hole is consistent with or greater than the end section of the connecting part of the soft board.

Images