BASE BOARD AND MOBILE TERMINAL

The present invention relates to the field of electronic technologies, and discloses a base board and a mobile terminal. The base board includes an electrical pattern and multiple components, the base board further includes a resin layer and a thin resin layer, the component is embedded in the resin layer, and an end face of a foot is flush to a surface of the resin layer; and the thin resin layer is attached to one exposed side of a foot of a component in the resin layer, a through hole corresponding to each foot is disposed in the thin resin layer, the circuit pattern is attached to one side that is of the thin resin layer and that is opposite to the resin layer, and the circuit pattern is connected to a pad that is electrically connected to a foot and that stretches into each through hole.

TECHNICAL FIELD

The present invention relates to the field of electronic technologies, and in particular, to a base board and a mobile terminal.

BACKGROUND

Currently, an ECP technology is mainly used in the industry to enhance product performance, implement higher integration, and meet a requirement for a thinner and smaller product. An embedded base board belongs to a new encapsulation technology in which a component is embedded in a base board/PCB according to a processing technology of the base board/the PCB and a component assembly feature. The embedded base board improves product integration, reduces an overall size of a module, and further improves product reliability and electric heating performance.

However, in the prior art, components are embedded in a same resin layer in an embedded common ECP processing process. When multiple components are applied to an embedded base board, because heights of the multiple components are different, an embedded structure in the prior art cannot ensure a same height of a component pad to a copper layer of a surface of the base board, and consequently, when the components are being connected, depths of holes that need to be disposed are different, and processing depths of all holes are different in a processing process. This greatly affects working efficiency of the base board during processing. In addition, because embedded depths of the components are different, pad sizes are different when a component is connected to a circuit pattern, and when the circuit pattern is being formed, this affects an effect of connecting the component to the circuit pattern.

SUMMARY

The present invention provides a base board and a mobile terminal, so as to improve an effect of connecting a component on a base board to a circuit pattern.

To resolve the foregoing technical problem, the present invention provides a base board, where the base board includes an electrical pattern and multiple components, the base board further includes a resin layer and a thin resin layer, the multiple components are embedded in the resin layer, and an end face that is of a foot of each component and that is used to connect the circuit pattern is exposed out of the resin layer and is flush to a surface of the resin layer; and the thin resin layer is attached to one exposed side of a foot of a component in the resin layer, a through hole corresponding to each foot is disposed in the thin resin layer, the circuit pattern is attached to one side that is of the thin resin layer and that is opposite to the resin layer, and the circuit pattern is connected to a pad that is electrically connected to a foot and that stretches into each through hole.

In the foregoing technical solution, the multiple components are embedded in the resin layer, and during embedment, feet of the multiple components are flush to the surface of the resin layer. Therefore, in a production process of the base board, when the thin resin layer is punctured to expose the feet of the components, puncturing depths are the same, thereby implementing puncturing controllability and facilitating processing. In addition, the feet of the multiple components are disposed on a same surface, thereby improving pad possibility, and further improving a connection effect of the circuit pattern.

In the foregoing specific setting, the base board further includes a protective layer that covers the thin resin layer, multiple window structures are disposed at the protective layer, and the multiple window structures are in a one-to-one correspondence with external ports of the circuit pattern. The disposed protective layer wraps the base board, thereby avoiding copper oxidation caused because of cable exposure of the circuit pattern on the base board, and improving a use effect of the entire base board.

In a specific case, the circuit pattern on the base board is distributed in two thin resin layers, and two layers of the circuit pattern are connected by using a plated through hole that penetrates through the resin layer and the thin resin layer. A foot of each component in the multiple components faces one side that is of the circuit pattern and that is connected to the foot of each component. That is, the circuit pattern on the base board is disposed in two opposite surfaces of the base board in two layers, thereby improving distribution efficiency of the circuit pattern. When a component is being disposed, a foot of the component faces a connection point that is of the circuit pattern and that is correspondingly connected to the foot of the component, thereby simplifying a layout of the circuit pattern, shortening a cabling length, improving utilization of the base board, and further improving an overall effect of the base board.

A thickness of the thin resin layer is from 20 μm to 30 μm in the foregoing setting. Therefore, a puncturing depth and a pad footprint can be effectively controlled. The thickness of the thin resin layer is 20 μm in more specific setting.

The present invention further provides a mobile terminal. The mobile terminal includes a housing, a power supply module disposed within the housing, and a control module connected to the power supply module, and the power supply module and the control module each include the above base board.

In the foregoing technical solution, all pads surfaces of components in a same direction are located in a same plane, and thin resin is pressed, thereby meeting a same depth requirement of a component pad to a copper layer, reducing a requirement for a pad size and a pad spacing, and facilitating processing. Further, a connection effect of a circuit pattern is improved, problems of properness of an overall module layout and product miniaturization and thinness are resolved, thereby improving an effect of product miniaturization and thinness in electrical connection of the power supply module, the control module, and the like, and promoting processing and thinness development of the mobile terminal.

The mobile terminal may be different terminals, such as a mobile phone or a wearable communications device.

REFERENCE NUMERALS

DESCRIPTION OF EMBODIMENTS

To make the objectives, technical solutions, and advantages of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings. Apparently, the described embodiments are merely a part rather than all of the embodiments of the present invention. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

As shown inFIG. 1,FIG. 1shows a schematic structural diagram of a base board according to an embodiment of the present invention.

To resolve the foregoing technical problem, this embodiment provides a base board. A circuit pattern4and multiple components3are disposed on the base board, and the base board further includes a resin layer1and a thin resin layer2. The multiple components3are embedded in the resin layer1, and an end face that is of a foot of each component3and that is used to connect the circuit pattern4is exposed out of the resin layer1and is flush to a surface of the resin layer1; and the thin resin layer2is attached to one exposed side of a foot of a component3in the resin layer1, a through hole corresponding to each foot is disposed in the thin resin layer2, the circuit pattern4is attached to one side that is of the thin resin layer2and that is opposite to the resin layer1, and the circuit pattern4is connected to a pad that is connected to a foot and that stretches into each through hole.

In the foregoing embodiment, pad surfaces of components in a same direction (that is, feet of components3) are located in a same plane, and thin resin is pressed, thereby meeting a same depth requirement of a component pad to a copper layer. Therefore, in a production process of the base board, the thin resin layer2is punctured to expose the feet of the components3, and puncturing depths are the same, thereby implementing puncturing controllability. In addition, a requirement for a pad size and a pad spacing is reduced. This facilitates processing, improves a connection effect of the circuit pattern4, and resolves problems of properness of an overall module layout and product miniaturization and thinness.

To help understand a structure of the base board provided in this embodiment, the following describes the structure and a principle of the base board in detail with reference to the accompanying drawings.

As shown inFIG. 1andFIG. 2, the base board provided in this embodiment includes three layers: two layers of thin resin layers2and a resin layer1clamped between the two layers of thin resin layers2, and components3are embedded in the resin layer1. In this embodiment, the components3include a first component32and a second component31, first components32are components that face a same direction, and the second component31is a component3whose foot faces a direction opposite to that of a foot of the first component32, that is, the foot of the first component32and the foot of the second component31are oppositely disposed.

Continuing to refer toFIG. 2, this embodiment provides multiple first components32and multiple second components31, and a quantity of first components32and a quantity of second components31may be selected to an actual function of the base board. As shown inFIG. 2, in specific setting, a circuit pattern4on the base board is distributed in the two thin resin layers2, and two layers of the circuit pattern4are connected by using a plated through hole6that penetrates through the resin layer1and the thin resin layer2. A foot of each component3in the multiple components3faces one side that is of the circuit pattern4and that is connected to the foot of each component3. Specifically, the first component32and the second component31are embedded in the resin layer1, and end faces of the foot of the first component32and the foot of the second component31are flush to a surface of the resin layer1, and the surface is a surface that is attached to the thin resin layer2. A through hole21corresponding to the foot of the first component32and the foot of the second component31is disposed on the thin resin layer2. According to the through hole21disposed on the thin resin layer2, the foot of the first component32and the foot of the second component31are exposed and are connected to the circuit pattern4. In addition, the two layers of the circuit pattern4are connected by using the plated through hole6that penetrates through the two layers of thin resin layers2and the resin layer1to form an entire circuit pattern4.

In the foregoing setting, a path of the circuit pattern4on the base board is shorter, and a layout of the circuit pattern4is proper. Therefore, performance of the circuit pattern4is improved, and an area of the circuit pattern4can be effectively reduced. In comparison with a base board in the prior art, a common electronic circuit protector (ECP), an electronic protection apparatus of the circuit pattern4) on the base board in the prior art uses an upward/downward component placement design, and in a component placement design, only whether module space meets a requirement is considered. Utilization of a copper layer on the back side of a pad is relatively low, and signals that need to be interconnected are connected by using a drill hole, and consequently, a module area is increased. When the component3is placed on the base board provided in this embodiment of the present invention, both a space constraint condition and an interconnection factor are considered, thereby improving overall module utilization and reducing a module area.

In specific setting, when multiple components3are applied to an embedded base board, pads of components3in a same direction to the circuit pattern4are of a same height, thereby ensuring a technological process of laser drilling. In addition, pad surfaces of components are used in the present invention to increase thin resin, reduce a drill hole depth and a drill hole up and down difference, and ensure a chip design of a small pad.

In addition, in a specific setting process, to improve security of the base board in use, the base board further includes a protective layer5that covers the thin resin layer2. Multiple window structures51are disposed at the protective layer5, and the multiple window structures51are in a one-to-one correspondence with external ports of the circuit pattern4. The disposed protective layer5wraps the base board, thereby avoiding copper oxidation caused because of cable exposure of the circuit pattern4on the base board, and improving a use effect of the entire base board.

In the foregoing embodiment, a thickness of the thin resin layer2is from 20 μm to 30 μm in specific setting. Therefore, a puncturing depth and a pad footprint can be effectively controlled. The thickness of the thin resin layer2is 20 μm in more specific setting.

To understand the structure of the base board provided in this embodiment, with reference toFIG. 3atoFIG. 3m, the following describes in detail a production method of the based board provided in this embodiment. The method specifically includes:

placing a first component32, where feet of first components32are located on a same plane;

performing filling with resin to wrap the first component32, where the feet of the first components32are flush to a surface of the resin;

attaching a thin resin layer2to the surface of the resin; and

forming a circuit pattern4in the thin resin layer2, where the circuit pattern4is connected to the first component32.

In the foregoing embodiment in the foregoing technical solution, pad surfaces of components in a same direction (that is, feet of components3) are located in a same plane, and thin resin is pressed, thereby meeting a same depth requirement of a component pad to a copper layer. Therefore, in a production process of the base board, the thin resin layer2is punctured to expose the feet of the components3, and puncturing depths are the same, thereby implementing puncturing controllability. In addition, a requirement for a pad size and a pad spacing is reduced. This facilitates processing, improves a connection effect of the circuit pattern4, and resolves problems of properness of an overall module layout and product miniaturization and thinness.

To help understand the foregoing method, the following describes steps of the method in detail with reference to specific accompanying drawings.

Step1: As shown inFIG. 3atoFIG. 3c, place a mold20in a first adhesive film10, where the mold20includes a hollow-out structure201that accommodates a first component32; place the first component32in the hollow-out structure201, where a foot of the first component32is attached to the first adhesive film10; and fill the hollow-out structure201of the mold20with resin.

Specifically, one side of the first adhesive film10is adhesive, and the mold20is disposed on the adhesive side of the first adhesive film10. The mold20includes multiple hollow-out structures201, and the hollow-out structure201is used to accommodate the first component32. The first component32is placed in the hollow-out structure201. During placement, the foot of the first component32faces the first adhesive film10, and the first component32is fastened by using adhesiveness of the first adhesive film10. Then, the hollow-out structure201is filled with the resin, so that a surface layer of the resin is flush to a top surface of the hollow-out structure201. In the foregoing method, a component3is placed by using the disposed mold20. This facilitates embedment of the component3, and improves production efficiency and a product qualification ratio.

Step2: As shown inFIG. 3dtoFIG. 3h, stick a second adhesive film11on one side that is of the mold20and that is opposite to the first adhesive film10; detach the mold20, and remove the first adhesive film10; place a second component31, and bond a foot of the second component31to the second adhesive film11; and perform filling with resin to wrap the second component31.

Specifically, as shown inFIG. 3d, the second adhesive film11is attached to one side that is of the mold20and that is opposite to the first adhesive film10, that is, the resin for filling is stuck by using the second adhesive film11. Then, as shown inFIG. 3e, the first adhesive film19is removed, and as shown inFIG. 3f, the mold20is removed. In this case, the resin for filling is stuck to the second adhesive film11.

As shown inFIG. 3g, the second component31is placed in the second adhesive film11. In this case, the foot of the second component31is stuck to the second adhesive film11. Then, as shown inFIG. 3h, filling is performed with the resin to wrap the second component31. The second component31is disposed on another side of a resin layer1, thereby improving distribution efficiency of a circuit pattern4. In addition, when the component3is being disposed, a foot of the component3faces a connection point that is of the circuit pattern4and that is correspondingly connected to the foot of the component3, thereby simplifying a layout of the circuit pattern4, shortening a cabling length, improving utilization of the base board, and further improving an overall effect of the base board.

Step3: As shown inFIG. 3itoFIG. 3j, remove the second adhesive film11, separately stick a thin resin layer2to two sides of a formed resin layer1, disposing an opening in the thin resin layer2to expose the foot of the first component32and the foot of the second component31; and disposing a through hole21in the resin layer1and the thin resin layer2according to a designed circuit pattern4.

Specifically, as shown inFIG. 3i, the second adhesive film11is removed. In this case, both the first component32and the second component31are embedded in the resin layer1, and the foot of the first component32and the foot of the second component31are exposed out of a surface of the resin layer1. The surface is used to attach the thin resin layer2. Continuing to refer toFIG. 3i, the thin resin layer2is stuck to two opposite surfaces of the resin layer1. A thickness of the thin resin layer2is from 20 μm to 30 μm in specific setting. Therefore, a puncturing depth and a pad footprint can be effectively controlled. The thickness of the thin resin layer2is 20 μm in more specific setting. As shown inFIG. 3j, after two layers of thin resin layers2are stuck, the through hole21is disposed in the stuck thin resin layer2. The through hole21is corresponding to the foot of the first component32and the foot of the second component31. In addition, a penetrative through hole21is further disposed in the thin resin layer2and the resin layer1, and the through hole21is used to form a plated through hole6and connect circuit patterns4located in the two thin resin layers2to form an entire circuit pattern4.

Step4: Copper the thin resin layer2to form a copper clad layer41, and etch the copper clad layer41to form the circuit pattern4, that is, separately copper two sides of the thin resin layer2, and etch plated copper to form the circuit pattern4.

Specifically, as shown inFIG. 3k, the two thin resin layers2are separately covered with copper, and during the coppering, the copper clad layer41is connected to the foot of the first component32and the foot of the second component31. In addition, the copper clad layer41penetrates through the through hole21that threads through the thin resin layer2and the resin layer1to form the plated through hole6. As shown inFIG. 3l, the copper clad layer is etched to form the circuit pattern4. In this case, an entire circuit pattern4is formed on the base board, and in the circuit pattern4, both the foot of the first component32and the foot of the second component31face one side that is of the circuit pattern4and that is correspondingly connected to the foot of the first component32and the foot of the second component31, thereby reducing setting of the circuit pattern4, avoiding overuse of the plated through hole6, and improving layout properness of the circuit pattern4.

Step5: As shown inFIG. 3m, coat a protective layer5, and dispose, at the protective layer, a window structure51corresponding to an external port of the circuit pattern4.

Specifically, as shown inFIG. 3m, the circuit pattern4is protected by using the disposed protective layer5, thereby avoiding oxidation of the circuit pattern4, and improving security of the entire base board in use. When the protective layer5is being coated, the protective layer5fills the plated through hole6to protect metal in the plated through hole6, thereby improving security of the entire base board. The protective layer5may be a paint layer in specific setting.

The base board provided in the foregoing embodiment may be applied to different products, such as a communications device or an electrical device, for example, a mobile phone, a tablet, a wireless router, a wearable electronic device, a light fixture, an air conditioner, an electric water heater, an electricity meter, a video camera, a telephone set, and a computer.

In a specific embodiment, an embodiment of the present invention further provides a mobile terminal. The mobile terminal includes a housing, a power supply module disposed within the housing, and a control module connected to the power supply module, and the power supply module and the control module each include the above base board.

In the foregoing embodiment, the power supply module and the control module each use the base board in the foregoing embodiment. It should be understood that when the power supply module and the control module use the foregoing base board, a circuit pattern and an embedded component on the base board are selected according to functions of the power supply module and the control module. It can be learned from the foregoing embodiment that, all pad surfaces of components in a same direction on the base board are located in a same plane. This meets a same depth requirement of a component pad to a copper layer, reduces a requirement for a pad size and a pad spacing, and facilitates processing. Further, a connection effect of the circuit pattern is improved, and problems of properness of an overall module layout and product miniaturization and thinness are resolved. According to an effect of the foregoing base board, when the power supply module and the control module provided in this embodiment use the foregoing base board, processing efficiency of the power supply module and the control module and an electrical connection effect can be effectively improved, miniaturization and thinness development is promoted, and product miniaturization and thinness in electrical connection in which the power supply module, the control module, and the like use a structure of the foregoing base board is further improved. The base board improves effects of the control module and the power supply module, thereby improving production processing efficiency of the mobile terminal and an electrical connection effect, and further promoting miniaturization and thinness development of the mobile terminal.

In specific setting, the mobile terminal may be different terminals, such as a mobile phone or a wearable communications device.