CN105578740B - Single-sided rigid-flex board and mobile terminal - Google Patents

Abstract

The present invention provides a single-sided rigid-flex board, comprising a dielectric layer and a wiring layer stacked on the dielectric layer, wherein the wiring layer comprises a plurality of signal lines and a plurality of ground lines, wherein the plurality of signal lines and the plurality of ground lines are alternately arranged, wherein the plurality of signal lines correspond to the plurality of ground lines one by one, and each of the signal lines forms a signal loop with a corresponding ground line. The present invention can ensure that a signal loop is formed in a timely manner during signal transmission by grounding the ground line, so that the impedance in the circuit will not increase, and the signal interference between the plurality of signal lines can be reduced accordingly, thereby achieving the technical effect of improving the transmission quality of the signal.

Description

Single-sided rigid-flex board and mobile terminal

technical field

The invention relates to the field of rigid-flex board manufacturing, and more specifically, the invention relates to a single-sided rigid-flex board and a mobile terminal.

Background technique

Rigid-flex board is a new type of printed circuit board that combines the durability of rigid PCB and the adaptability of flexible PCB. Among all types of PCBs, rigid-flex is the most resistant to harsh application environments, so it is subject to Favored by major electronic device manufacturers.

In order to reduce the manufacturing cost of electronic devices, single-sided rigid-flex boards with simple structure and low cost are usually used in the manufacturing process of electronic devices. However, since there is no reference ground in the single-sided rigid-flex board, the backflow cannot be formed in time during the signal transmission process, and the impedance of the circuit will increase, resulting in poor signal quality. At the same time, due to the increase of circuit impedance, the signal cannot be returned in a short-distance path. At this time, the signal will emit energy into the space, and the radiation of the signal to the space will also increase, resulting in increased interference to other signals and eventually affecting other normal operation of the signal.

Contents of the invention

The object of the present invention is to provide a single-sided rigid-flex board, which has small signal impedance and little interference to other signals during the working process of the rigid-flex board.

The present invention provides a mobile terminal, which adopts the above-mentioned single-sided rigid-flex board.

In order to achieve the above object, the embodiment of the present invention provides the following technical solutions:

The present invention provides a single-sided rigid-flex board, which includes a dielectric layer and a wiring layer stacked on the dielectric layer, the wiring layer includes a plurality of signal lines and a plurality of ground lines, and the plurality of signal lines and The multiple ground wires are arranged alternately, the multiple signal wires correspond to the multiple ground wires one by one, and each signal wire forms a signal loop with a corresponding ground wire.

Wherein, the signal line and the ground line have the same width.

Wherein, the signal line and the ground line are arranged parallel to each other.

Wherein, the wiring layer further includes a power line and a power ground line, and the power line and the power ground line are arranged in parallel on one side of the signal line and the ground line.

Wherein, the width of the power line and the power ground line are both L, and the width of the signal line and the ground line are both H, then 1/4L≤H≤1/3L.

Wherein, the carrying capacity of the power supply wire and the power ground wire is 10 amperes per square millimeter.

Wherein, the wiring layer is coated with insulating ink.

Wherein, the insulating ink layer is coated with a shielding layer.

Wherein, the insulating ink is green paint, polyimide or ABF film material.

The present invention also provides a mobile terminal, including the single-sided rigid-flex board described in any one of the above.

Embodiments of the present invention have the following advantages or beneficial effects:

In the present invention, a plurality of signal wires are provided in the wiring layer of the single-sided rigid-flex board with one-to-one corresponding ground wires, and the ground wires are grounded to ensure that the signal loop is formed in time during the signal transmission process, so that the impedance in the circuit does not change. will increase, and the signal interference between multiple signal lines can also be correspondingly weakened, so as to achieve the technical effect of improving the transmission quality of the signal.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a top view structural schematic diagram of a single-sided rigid-flex board of the present invention;

Fig. 2 is a schematic cross-sectional view of the single-sided rigid-flex board shown in Fig. 1 .

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

In addition, the following descriptions of the various embodiments refer to the attached drawings to illustrate specific embodiments in which the present invention can be implemented. The directional terms mentioned in the present invention, for example, "upper", "lower", "front", "rear", "left", "right", "inner", "outer", "side", etc., only is to refer to the direction of the attached drawings. Therefore, the direction terms used are for better and more clearly explaining and understanding the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, use a specific orientation construction and operation, therefore, should not be construed as limiting the invention.

In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Ground connection, or integral connection; can be mechanical connection; can be directly connected, can also be indirectly connected through an intermediary, and can be internal communication between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more. If the term "process" appears in this specification, it not only refers to an independent process, but also includes in this term as long as it can realize the expected function of the process when it cannot be clearly distinguished from other processes. In addition, the numerical range represented by "-" in this specification means the range which includes the numerical value described before and after "-" as a minimum value and a maximum value, respectively. In the drawings, those with similar or identical structures are denoted by the same reference numerals.

Referring to Fig. 1, the single-sided rigid-flex board of the present invention includes a dielectric layer 10 and a wiring layer 20, the wiring layer 20 is stacked on the dielectric layer 10, and the wiring layer 20 includes a plurality of signal lines 21 and A plurality of ground wires 22, the plurality of signal wires 21 and the plurality of ground wires 22 are arranged alternately, each of the signal wires 21 corresponds to an adjacent ground wire 22, and the ground wires 22 are grounded to form a signal loop.

By interleaving the ground wires 22 and the signal wires 21 , the signal wires are staggered from each other, so the mutual interference between signals can be reduced. Each signal line 21 corresponds to an adjacent ground line, which can reduce the length of the signal loop. Through such a wiring method, the positions of the signal lines can be properly arranged to obtain good impedance matching.

In the present invention, a plurality of signal wires are provided in the wiring layer of the single-sided rigid-flex board with one-to-one corresponding ground wires, and the ground wires are grounded to ensure that the signal loop is formed in time during the signal transmission process, so that the impedance in the circuit does not change. will increase, and the signal interference between multiple signal lines can also be correspondingly weakened, so as to achieve the technical effect of improving the transmission quality of the signal.

Further, the signal line 21 and the ground line 22 have the same width. Make the signal keep stable transmission in the whole signal loop. At the same time, it is also convenient for the processing and manufacturing of single-sided rigid-flex boards.

Furthermore, the signal line 21 and the ground line 22 are arranged parallel to each other. In order to ensure the coupling performance between the corresponding signal line 21 and the ground line 22, the overall impedance value of the signal loop is further reduced.

The wiring layer 20 of the single-sided rigid-flex board in the embodiment of the present invention also includes a power line 23 and a power ground wire 24, and the power line 23 is connected to a power supply to provide current for the single-sided rigid-flex board. The power line 23 forms a discharge circuit through the power ground line 24 . Further, the plurality of signal lines 21 and the plurality of ground lines 22 are only located on one side of the power line 23 and the power ground line 24 . That is to say, the power line 23 and the power ground line 24 are arranged adjacently, and the power line 23 and the power ground line 24 are located on one side of the single-sided rigid-flex board. The purpose of such setting is to reduce the mutual interference between the power loop and the signal loop, and improve the transmission quality of the signal.

Further, the width of the power line 23 and the power ground line 24 are equal and both are L, and the width of the signal line 21 and the ground line 22 are both H, so it should satisfy 1/4L≤H≤1 /3L.

Since the power line 23 and the power ground line 24 are used to provide current for the entire single-sided rigid-flex board, the current on them is greater than the current in each signal line 21 and ground line 22 . The current in the signal line 21 and the ground line 22 is small, so a small cross-sectional area can be used. Since the thickness of the signal line 21 and the ground line 22 is already very small, it is difficult to reduce their thickness. In this embodiment, the cross-sectional area of the signal line 21 and the ground line 22 can be reduced by reducing the width thereof. So as to achieve the technical effect of reducing the overall volume of the single-sided rigid-flex board. Similarly, if the width is too small, the structural strength of the signal line 21 and the ground line 22 will be insufficient and easily broken. Taking the above factors into consideration, it should be ensured that 1/4L≤H≤1/3L.

Further, in order to ensure the stability of the signal transmission process of the power line 23 and the power ground line 24, the current intensity in the signal layer needs to be limited. The current carrying capacity of the power line 23 and the power ground line 24 in this embodiment is 10 amperes per square millimeter (A/mm ² ).

Please refer to FIG. 2, further, the wiring layer 20 is coated with an insulating ink layer 30, and the insulating ink layer 30 may include a solder resist material such as green paint, or may include polyimide (polyimide) or ABF The insulating material of the film (ajinomotobuild-up film), which can protect the circuit structure inside the single-sided rigid-flex board from being oxidized or shorted to each other.

In order to further reduce the mutual interference of signals between the wiring layer 20 and the outside world, and improve the transmission quality of signals. A shielding layer 40 may also be coated on the insulating ink layer 30 . The shielding layer 40 can be formed on the surface of the insulating ink layer 30 by printing or screen printing with conductive materials such as copper paste and silver paste. The shielding layer 40 can also be formed on the surface of the insulating ink layer 30 by pressing or pasting conductive foil materials such as copper foil, silver foil, and aluminum foil.

The present invention also provides a mobile terminal, which includes any one of the above-mentioned rigid-flex boards. The mobile terminal can be any electronic device with a display function such as a mobile phone, a tablet computer, a television, a monitor, a notebook computer, a digital photo frame, a navigator, and the like.

In the description of this specification, descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific examples" or "some examples" mean specific features described in connection with the embodiment or example, A structure, material or characteristic is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The implementation methods described above do not constitute a limitation to the scope of protection of the technical solution. Any modifications, equivalent replacements and improvements made within the spirit and principles of the above implementation methods shall be included in the protection scope of the technical solution.

Claims (9)

1. a kind of single side Rigid Flex, which is characterized in that including dielectric layer and the wiring being laminated on the dielectric layer Layer, the wiring layer includes a plurality of signal wire and a plurality of ground wire, and a plurality of signal wire and a plurality of ground wire are alternately arranged, institute It states a plurality of signal wire to correspond with a plurality of ground wire, and every signal wire ground wire corresponding with one is formed Signal circuit, the wiring layer further include power cord and power ground, and the power cord is disposed in parallel in the power ground The side of the signal wire and the ground wire, power cord form discharge loop by power ground.

2. single side Rigid Flex as described in claim 1, which is characterized in that the width phase of the signal wire and the ground wire Together.

3. single side Rigid Flex as described in claim 1, which is characterized in that the signal wire and the ground wire are mutually parallel Setting.

4. single side Rigid Flex as described in claim 1, which is characterized in that the width of the power cord and the power ground Degree is L, and the width of the signal wire and the ground wire is H, then has 1/4L≤H≤1/3L.

5. single side Rigid Flex as described in claim 1, which is characterized in that the load of the power cord and the power ground Flow is 10 amperes per square millimeters.

6. single side Rigid Flex as described in claim 1, which is characterized in that be coated with dielectric ink on the wiring layer.

7. single side Rigid Flex as claimed in claim 6, which is characterized in that be coated with shielding in the insulating oil layer of ink Layer.

8. single side Rigid Flex as claimed in claim 6, which is characterized in that the dielectric ink is green paint, polyimide Or ABF membrane materials.

9. a kind of mobile terminal, which is characterized in that including the single side Rigid Flex described in claim 1-8 any one.