TW201351449A - Integrated flat cable structure of flexible standard flat cable and circuit board - Google Patents

Abstract

Disclosed is an integrated flat cable structure of flexible standard flat cable and traditional circuit board. It comprises a flexible standard flat cable having a plurality of paralleled and no jumper conductive lines as well as two insulting layers. Two insulting layers respectively formed on the upper and lower surfaces of the conductive lines. The conductive lines expose a set of contacts at lower surface of one end of the flexible standard flat cable while at least one of the contacts is used as ground line contact; a shielding layer displaced at the upper surface of the flexible standard flat cable with an extension portion extends at the position corresponding to the contact; and a circuit board with a set of conductive contacts displaced at one end of the circuit board. The contacts of the flexible standard flat cable are electrically connected to the conductive contacts. The surface of the circuit board has at least a ground conductive contact. The extension portion of the shielding layer covers the ground line conductive region and the ground line conductive contacts are connected to ground line contacts of the flexible standard flat cable so that the electromagnetic noise can be absorbed by shielding layer or high voltage electrostatic can be reduced through excellent guidance of ground line connection.

Description

Flexible standard cable and circuit board integrated cable structure

The invention relates to a circuit cable, in particular to a circuit cable which combines a soft standard cable, such as a flexible flat cable commonly known as FFC (Flexible Flat Cable), and a general circuit board.

Generally, the flexible circuit board can be roughly divided into (1) a soft board formed by image transfer and etching a conductive layer and pressing the insulating layer (2) a flexible board directly printing the conductive layer on the insulating substrate (3) The parallel straight copper wire is stretched by a roll-type mechanical and laminated with insulation to form a standard cable. If the function can be divided into a carrier board and a cable or a flexible circuit board having both a carrier board and a cable function, the flexible circuit board has various other names, such as a flexible printed circuit board and a flexible cable. In fact, they are all the same products. If classified by manufacturing cost, the soft board manufactured by etching is the most expensive, followed by printing, and the cheapest one is standard wiring.

With the competition and mass production of the electronics industry, in order to further reduce costs, the design of internal parts has become more and more simplified, and the transmission of signals between the modules can be obtained through the interconnection of soft standard cables (commonly known as FFC). More importantly, at the same time, it can reduce costs. However, since the standard cable transmits signals, it is not only easy to generate high-frequency and high-energy electromagnetic waves, but the signals transmitted by the signals are also easily interfered by external high-frequency noise, so that the signals are distorted. Moreover, when a flexible cable or a circuit board often passes through a moving shaft hole, a high-voltage static electricity is generated, and a quick and effective ground connection conduction is more important.

In order to solve the above-mentioned shortcomings, a conventional method is to cover a surface of a flexible circuit board with a metal shielding layer for blocking external electromagnetic noise, but the metal shielding layer can achieve the effect of blocking external electromagnetic noise interference. However, since the metal shield layer that is covered is not effectively connected to the ground of the electronic device, the effect of shielding the metal shield from electromagnetic noise and static electricity is not good.

Therefore, the conventional flexible circuit boards which are easy to connect to the grounding wire are generally used as the signal connection by the modules inside the conventional electronic device. However, because the traditional flexible circuit board is still higher in cost than the general soft standard cable, in addition, the soft standard cable has the effect of not being shielded by electromagnetic noise. The copper wire width cannot be made small and the impedance control is difficult. Therefore, how to replace the use area of some traditional flexible circuit boards with general soft standard cables to reduce the cost, and provide effective electromagnetic noise shielding effect and signal impedance control, and the static elimination guide structure has been the industry. Urgently needed to be solved. In addition, the application of some products still needs to pass through narrow holes or shaft holes, and it is necessary to pass tens of thousands of bending-resistance experiments, and the beam-shaped structure through partial cutting cannot be avoided.

In order to effectively overcome the aforementioned drawbacks, it is an object of the present invention to design a composite circuit cable that combines a flexible standard wiring and a conventional etching process circuit board.

Another object of the present invention is to provide a flexible standard cable with a shielding surface grounding and a jumper connection functional structure simultaneously shielding the soft standard wiring surface. The layers can also be controlled by appropriate insulation thickness or shielded openings for impedance control purposes.

Still another object of the present invention is to provide a more widely used circuit cable in which the circuit board used can be one of a hard circuit board, a flexible circuit board, and a hard and soft board. If a flexible standard cable or flexible circuit board is used, in order to facilitate the passage of narrow narrow holes or shaft holes, a plurality of cutting lines can be cut along the signal gap and the bundle structure can be further stacked, which can be applied in application. It is convenient to pass the soft standard cable through the narrow narrow hole or the shaft hole.

In order to achieve the above object, the integrated cable structure of the flexible standard cable and the circuit board designed by the invention comprises a soft standard cable, and has a plurality of parallel and straight line wires and two insulation layers, and two insulation layers. The insulating layers are respectively formed on the upper and lower surfaces of the wire line, and the wire line is exposed at a lower surface of one end of the flexible standard wire with a set of contacts, and at least one of the contacts is grounded a shielding layer disposed on an upper surface of the flexible standard cable and having an extending portion extending outwardly corresponding to the contact; and a circuit board having a conductive connection at one end thereof The contact point of the flexible standard cable is electrically connected to the conductive contact, and the surface of the circuit board further has at least one ground connection area, and the extension of the shielding layer is disposed on the ground connection area and the The ground wire guiding area is connected with the grounding wire joint of the soft standard cable (for example, when a double panel or a multi-layer board is used, the connection can be completed through the through hole, and if a single panel is used, the ground layer can be directly covered with the green film directly Open the hole)

Furthermore, corresponding staggered conductive contacts can be disposed at both ends of the circuit board, and at least a consistent hole can be disposed on the circuit board to achieve a jumper function, so as to facilitate the conductive connection at the conductive contact and the corresponding staggered conductive connection An electrical connection is made on the line between the points.

1 to 3 are exploded perspective views, combined views, and cross-sectional views of the first embodiment of the present invention. As shown in the figure, the integrated cable structure of the flexible standard cable and the circuit board of the present invention comprises a flexible standard cable 10, a shielding layer 20 and a circuit board 40, wherein the flexible standard cable 10 has a plurality of parallel straight lines. And the non-jumping wire line 12, an upper insulating layer 14 and the lower insulating layer 16, the two insulating layers 14, 16 are respectively located on the upper surface and the lower surface of the wire line 12, so that the wire line 12 achieves the purpose of insulation. The insulating layers 14, 16 may be constructed of PET or PI insulating material.

The wire line 12 is exposed with a set of contacts 122 at the lower surface of one end of the flexible standard cable 10. The shielding layer 20 is disposed on the upper surface of the upper insulating layer 14, and the shielding layer 20 is further extended outwardly at a contact 122 corresponding to one end of the wire line 12 by an extension 22 of an appropriate length. The shielding layer 20 may be formed of a conductive metal film such as copper foil, silver foil, aluminum foil or silver paste coating, and the shielding layer 20 may be selectively attached to the upper surface of the upper insulating layer 14 by a bonding layer 30. The shielding layer 20 is selected to be printed by silver paste. At this time, the bonding layer 30 can be a general insulating ink printing or bonding layer 30 or a general insulating material such as PET or PI. At this time, the bonding layer 30 is slightly extended. Exceeding the exposed area to prevent the conductive material from being poured into the electrically conductive joint region of the extension portion 22 and the conductive contact 42 during the printing of the silver paste.

The circuit board 40 can select one of a single-panel, double-panel or single-panel double-sided or multi-layer circuit board. The two ends of the circuit board 40 have a set of conductive contacts 42 and a corresponding set of conductive contacts. Point 44, the conductive contact 42 and the corresponding conductive contact 44 are through the line 422 provided inside the circuit board 40. Electrical connection and jumper structure. When the circuit board 40 belongs to the double panel and the conductive contacts 42 and the corresponding conductive contacts 44 are respectively disposed on different surfaces of the circuit board 40, at least a consistent hole (not shown) can be disposed on the circuit board 40. Electrical connections or even jumps are made on the lines between the conductive contacts 42 and the corresponding conductive contacts 44. The conductive contacts 42 are electrically connected to the contacts 122 of the flexible standard cable 10, and the conductive contacts 42 and the contacts 122 of the flexible standard cable 10 are optionally connected by soldering or conductive bonding.

The surface of the circuit board 40 adjacent to the conductive contact 42 has a ground guiding area 46 which is selected from the surface of the circuit board 40 by metal plating, printing coating or metal film coating. And electrically connected to at least one of the ground conductive contacts 462G through an extension line 462, and the connected conductive contacts 462G are pre-defined on the flexible standard cable 10 for providing a ground connection. The line contacts 122G are connected.

The extension portion 22 of the shielding layer 20 is disposed on the surface of the ground conductive contact 46 of the circuit board 40, so that the shielding layer 20 can be connected to the flexible standard cable 10 via the ground conductive contact 46 and the conductive contact 462G, respectively. The ground contact 122G for grounding is electrically connected.

A conductive adhesive layer 48 is disposed between the extension portion 22 of the shielding layer 20 and the ground conductive contact 46 of the circuit board 40 for providing the extension portion 22 to the ground conductive contact 46 and the extension line 462, and An electrical connection is formed between the two. The circuit board 40 is located at one end of the corresponding conductive contact 44 and can be connected in a plugged manner to an external connector (not shown) to achieve signal connection.

Referring to Figure 4, there is shown a cross-sectional view of a second embodiment of the present invention. As shown in the figure, the structures in the second embodiment are generally the same as those in the first embodiment, except that the lower surface of the flexible standard cable 10 is also covered. There is a shielding layer 20a, and the shielding layer 20a can also be attached to the lower surface of the lower insulating layer 16 by the bonding layer 30a to provide an electromagnetic shielding effect at the lower surface of the flexible standard wiring 10.

Referring to FIG. 5, the circuit board used in the present invention may be one of a hard circuit board, a flexible circuit board, and a hard and soft board. If a soft standard cable or flexible circuit board is used, it is convenient to pass narrow narrow holes or shaft holes. It is designed to cut a plurality of cutting lines 70 along a gap parallel to the wire lines 12, and it is more convenient to pass the soft standard wire 10 through narrow narrow holes or shaft holes in application. At the same time, the shielding layer on the surface of the flexible standard cable 10 can also achieve the purpose of impedance control through appropriate insulation thickness control or shielding layer opening. In this case, a relatively simple process such as silver paste printing can be selected.

Please also refer to FIG. 6, which is a schematic view of the appearance of the third embodiment of the present invention. As shown, in the third embodiment, one end of the flexible standard cable 50 can be electrically connected to the circuit board 40, and the flexible standard cable 50 itself can be selected to be cut along the gap between the wire lines 12. The plurality of cutting lines 70 are folded and extended rearward in a bundle manner, so that the soft standard cable 50 can be widely applied to the hinge structure. Similarly, the bundle-like laminated structure can also be applied to a circuit board 40 made of a soft material or alternatively.

Fig. 7 is a view showing that the plurality of flexible wires of the soft standard cable 50 in Fig. 6 cut by the cutting line 70 can be further tied by a binding member 71. The tied soft standard cable 50 can then be easily passed through the shaft hole 73 of a shaft member 72.

Please refer to FIG. 8 , which is a schematic diagram of another embodiment of the circuit board of the present invention. As shown, in the present embodiment, a circuit board 60 is provided, the electric The circuit board 60 can be configured to have a proper angle α such that the conductive contacts 62 and the corresponding conductive contacts 64 at both ends of the circuit board 60 extend in an appropriate angle α direction, thereby making the application board 60 soft. The integrated cable structure of the standard cable and the circuit board can provide a multi-directional routing design. At the same time, the circuit board can be a flexible circuit board, and has several cutting lines cut along the gap between the wire lines and is folded back into a bundle structure. Referring to Figure 9, there is shown a cross-sectional view of a fourth embodiment of the present invention. As shown in the figure, between the shielding layer 20 and the flexible standard wiring 10, at least one impedance matching layer 81 made of one of insulating material and insulating ink may be included as the signal impedance matching control. In addition to increasing the impedance matching layer 81 to control signal impedance matching, it is also possible to increase the thickness of the bonding layer 30 to achieve signal impedance matching control. Furthermore, the shielding layer 20 may also include at least one opening structure 82 to reduce the capacitance effect and increase the impedance control value as the transmission impedance matching of the integrated wiring.

The flexible standard cable 10 may further include a bottom shield layer 21 on the surface (bottom surface) of the shield layer 20 to increase the shielding and electrostatic conduction effects of the flexible standard cable 10. As for the circuit board 40, a circuit board shielding layer 83, 84 may be separately disposed on the upper surface and the lower surface of the circuit board 40 to increase the shielding and electrostatic conduction effect of the integrated wiring of the present invention.

It can be seen from the foregoing description that the present invention provides an integrated cable structure of a flexible standard cable and a circuit board, which comprises a flexible standard cable, a shielding layer and a circuit board, which are mainly wrapped on the outer surface of the soft standard cable. The shielding layer is covered, and the electromagnetic noise of the outside is blocked by the shielding layer for electromagnetic interference of the soft standard cable and has impedance control function. Further, the shielding layer has an extending portion and is grounded on the surface of the circuit board. Conduction area, ground wire conductive connection The point is electrically connected to one of the conductive contacts on the circuit board, and the conductive contact is a contact of a soft standard cable pre-defined to provide a ground connection, so that the electromagnetic interference absorbed by the shielding layer The high-voltage static electricity generated by the movement of the wire shaft hole can be quickly eliminated by the guidance of the ground wire, thereby improving the effect of electromagnetic shielding and static elimination. The invention also has the following advantages:

1. The signal connection is provided by a flexible standard cable, and the invention can reduce the production cost of the electronic device relative to the manner in which the signal is transmitted using the flexible circuit board.

2. The surface of the flexible standard cable of the present invention is covered with a shielding layer, and can be connected to the ground line on the electronic device through the guiding of the ground guiding area provided on the circuit board, and can provide better. Electromagnetic shielding and static elimination.

3. The present invention can provide and adjust the impedance matching of the soft standard cable by changing the structure of the shielding layer, for example, by arranging an appropriate number and size of perforations on the shielding layer.

4. The invention can also utilize the bundled soft standard soft standard cable and the integrated cable structure of the circuit board, and can be applied to the wiring design of the rotating shaft portion of the electronic device.

5. The conductive contacts of the circuit board of the present invention and the corresponding conductive contacts can be designed to extend in an appropriate angular direction, so that the flexible standard cable and the integrated circuit cable structure of the circuit board can be provided. More directional routing design and more suitable space applications. In addition, the technology of the through hole can be used to make the wire jumper.

In the above, it is merely a preferred embodiment of the present invention, and is not intended to limit the present invention; other things that are not accomplished without departing from the spirit of the present invention. Modifications or substitutions should be included in the scope of the patent application described later.

10‧‧‧Soft standard cable

12‧‧‧Wire lines

122‧‧‧Contacts

122G‧‧‧ ground contact

14‧‧‧Upper insulation

16‧‧‧lower insulation

20, 20a‧‧‧Shield

21‧‧‧Bottom shield

22‧‧‧Extension

30, 30a‧‧ ‧ glue layer

40‧‧‧ boards

42‧‧‧Electrical contacts

422‧‧‧ lines

44‧‧‧corresponding to conductive contacts

46‧‧‧Ground junction area

462‧‧‧Extended lines

462G‧‧‧ ground wire conductive contacts

48‧‧‧Electrical adhesive layer

50‧‧‧Soft standard cable

60‧‧‧ boards

62‧‧‧Electrical contacts

64‧‧‧corresponding to conductive contacts

70‧‧‧ cutting line

71‧‧‧Bundle members

72‧‧‧Shaft members

73‧‧‧Axis hole

81‧‧‧ impedance matching layer

82‧‧‧opening structure

83‧‧‧Board shield

84‧‧‧Circuit board shield

‧‧‧‧ angle

Fig. 1 is an exploded perspective view showing a first embodiment of the present invention.

Fig. 2 is a schematic view showing the combination of the first embodiment of the present invention.

Figure 3 is a cross-sectional view showing a first embodiment of the present invention.

Figure 4 is a cross-sectional view showing a second embodiment of the present invention.

Fig. 5 is a view showing the soft standard cable in Fig. 2 for further cutting a plurality of cutting lines.

Figure 6 is a schematic view showing the appearance of a third embodiment of the present invention.

Fig. 7 is a view showing a plurality of lines cut by the soft standard cable in Fig. 6 which can be further tied.

Figure 8 is a schematic view of another embodiment of the circuit board of the present invention.

Figure 9 is a cross-sectional view showing a fourth embodiment of the present invention.

10‧‧‧Soft standard cable

12‧‧‧Wire lines

122‧‧‧Contacts

122G‧‧‧ ground contact

14‧‧‧Insulation

16‧‧‧Insulation

20‧‧‧Shield

22‧‧‧Extension

30‧‧‧ glue layer

40‧‧‧ boards

42‧‧‧Electrical contacts

422‧‧‧ lines

44‧‧‧corresponding to conductive contacts

46‧‧‧ ground wire conductive contacts

462‧‧‧Extended lines

462G‧‧‧ ground wire conductive contacts

48‧‧‧Electrical adhesive layer

Claims (16)

A flexible standard cable and a circuit board integrated cable structure, comprising: a soft standard cable, having a plurality of parallel straight lines and no jumper wire lines, an upper insulating layer and a lower insulating layer, the wire lines A set of contacts is exposed at a lower surface of one end of the flexible standard cable, and at least one of the contacts is used as a ground contact; a shielding layer is disposed on the soft standard cable, and Corresponding to an extension extending outwardly from the contact; and a circuit board having a set of conductive contacts and a set of corresponding conductive contacts, the contacts of the flexible standard cable being electrically connected to the conductive connection The circuit board has at least one ground connection area, and the extension of the shielding layer of the flexible standard cable is disposed on the ground connection area, and the ground connection area and the ground of the soft standard cable Wire contacts are electrically connected. The flexible cable and the integrated circuit cable structure of the circuit board according to claim 1, wherein a conductive adhesive layer is disposed between the extending portion of the shielding layer and the ground guiding region. The integrated cable structure of the flexible standard cable and the circuit board according to the first aspect of the patent application, wherein the shielding layer is formed by one of a conductive metal film coated with copper foil, silver foil, aluminum foil or silver paste. . The integrated cable structure of the flexible standard cable and the circuit board according to claim 1, wherein the shielding layer is attached to the flexible standard cable by a glue layer. As described in claim 1, wherein the shielding layer and the flexible standard cable further comprise at least one layer of insulating material and insulating ink. The impedance matching layer is constructed. The integrated cable structure of the flexible standard cable and the circuit board according to claim 1, wherein the shielding layer comprises at least one opening structure. The flexible cable and the integrated circuit cable structure of the circuit board according to claim 1, wherein the circuit board is formed by one of a single panel, a double panel or a multi-layer circuit board, and the circuit board is selected as a hard type. One of the circuit board, flexible circuit board, and soft and hard board. The integrated cable structure of the flexible standard cable and the circuit board according to the first aspect of the invention, wherein the conductive contact of the circuit board and the corresponding conductive contact extend in an angular direction with each other. The integrated cable structure of the flexible standard cable and the circuit board according to the first aspect of the patent application, wherein the conductive contact and the contact of the soft standard cable are selected to be welded and conductive rubber. connection. The integrated cable structure of the flexible standard cable and the circuit board according to the first aspect of the patent application, wherein the ground wire guiding region is selected by forming a metal film, a printing coating, and a metal film on the circuit. On the board. The integrated cable structure of the flexible standard cable and the circuit board according to claim 1, wherein the ground connection area is electrically connected to the ground connection of the flexible standard cable through an extension line. The flexible standard cable and the integrated circuit cable structure of the circuit board according to claim 1, wherein the soft standard cable cuts a plurality of cutting lines along a gap between the wire lines. The flexible cable and the integrated circuit cable structure of the circuit board according to claim 12, wherein the plurality of cut wires are further overlapped and tied. The integrated cable structure of the flexible standard cable and the circuit board according to claim 13 , wherein the plurality of cut wires pass through a shaft hole of a rotating shaft member. The flexible standard cable and the integrated circuit cable structure of the circuit board according to claim 1, wherein the flexible standard cable further comprises a bottom shield layer on a surface of the shielding layer. The flexible standard cable and the integrated circuit cable structure of the circuit board according to claim 1, wherein the circuit board further comprises at least one circuit board shielding layer.