Patent Description:
With development of electronic products, the electronic products have an increasingly high requirement for heat dissipation. A material of a middle frame member in an existing electronic product gradually cannot meet a current heat dissipation requirement. For example, a middle frame material of a current mobile phone gradually cannot meet a current heat dissipation requirement, and particularly, a mobile phone chip area with relatively high power consumption emits a relatively large amount of heat. Consequently, temperature of some positions of a middle frame member is excessively high. A frequently-used material of an existing mobile phone middle frame is die casting magnesium alloy, stainless steel, die casting aluminum alloy, or die casting zinc alloy. A coefficient of heat conductivity of the material is between <NUM> to <NUM> W/m. k, and the material cannot conduct heat rapidly. Consequently, heat of some high-temperature areas of the middle frame member cannot be conducted to a low-temperature area in time, temperature of the high-temperature positions cannot be effectively reduced, and an application requirement for heat dissipation of a current mobile phone cannot be met.

Therefore, how to improve heat dissipation performance of a middle frame member of an electronic product becomes an urgent problem to be resolved.

<CIT> discloses a printed circuit board assembly (PCBA), which is connected to a frame within a passage. The PCBA includes a circuitry package attached to a printed circuit board. The circuitry package has a peripheral edge extending from the printed circuit board to a distal end joined to a cap. A cover is attached to the frame to enclose the PCBA. A thermal interface material (TIM) is disposed between the cover and the PCBA, the TIM defining an opening sized to receivingly engage the circuitry package in a close mating engagement contacting the TIM simultaneously against the cap and the peripheral edge to conduct heat away from the circuitry package. A heat conductor attached to the other side of the printed circuit board in an overlapping opposition to the circuitry package conducts heat away from the printed circuit board that is generated by the circuitry package.

<CIT> discloses a structure to dissipate heat from an internal heating component efficiently for a miniaturized, thin portable electronic apparatus. The portable electronic apparatus comprises a housing, a circuit board accommodated in the housing and mounted with an electronic component on a surface on one side of the circuit board, a thermally conductive member arranged opposite to the surface on one side of the circuit board and having thermal conductive property, and a battery accommodated in a battery chamber formed in the housing. The thermally conductive member forms at least a part of the battery chamber.

<CIT> discloses a solid state data storage assembly which includes thermal interface material that conducts heat away from electrical components of the assembly.

<CIT> discloses cooling techniques for portable devices such as, for example, mobile telephones. In one implementation, a portable device comprises one or more printed circuit boards supporting multiple heat-generating components, an airflow generator adapted to generate an airflow internally in the portable device, and a heat sink element thermally connected to the heat-generating components, wherein the heat sink element is adapted to receive heat from the heat-generating components for dissipation by the airflow.

A middle frame member and a method for manufacturing a middle frame member are disclosed. According to the method, heat dissipation performance of a middle frame member of an electronic product can be improved.

The present invention is defined by a middle frame member according to independent claim <NUM>.

Therefore, in the embodiments of the present invention, first metal with a high coefficient of heat conductivity is electroplated in a first area of a middle frame substrate body, and a heat-conducting capability of the middle frame member is improved by using the first metal layer, so that heat of some components that emit a large amount of heat can be effectively conducted to the middle frame substrate body in time, and excessively high partial temperature is avoided. In addition, the middle frame substrate body can conduct, as soon as possible, the heat generated by the components in an electronic device, so that heat dissipation performance of the middle frame member is improved.

To describe the technical solutions in embodiments of the present invention more clearly, the following briefly describes the accompanying drawings required for describing the embodiments of the present invention. Apparently, the accompanying drawings in the following description show merely some embodiments of the present invention, and persons of ordinary skill in the art may still derive other drawings from these accompanying drawings without creative efforts.

In the following, embodiments of the invention are described with particular reference to <FIG>. The other examples of the disclosure are provided for illustrative purposes to support a better understanding of the invention.

The following clearly and completely describes the technical solutions in the embodiments of the present invention with reference to accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are a part rather than all of the embodiments of the present invention. All other embodiments obtained by persons 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 defined by the appended claims.

It should be understood that a middle frame member in the embodiments of the present invention is a support part inside an electronic product for supporting components in the electronic product. In other words, the middle frame member may be used for fastening, placing, accommodating, or supporting the components in the electronic product. For example, the middle frame member may be a support part used for placing a PCB board, a chip, or a battery in the electronic product, or the middle frame member is a support part used for supporting a screen of the electronic product. The electronic product may also be referred to as an electronic device or a terminal, and may include but is not limited to a mobile phone, a mobile computer, a tablet (portable android device, Pad), a personal digital assistant (Personal Digital Assistant, PDA), a media player, a smart TV, a smartwatch, smart glasses, a smart band, an ebook, a mobile station, and the like. The middle frame member may be a middle frame or a front cover of a mobile phone, a screen support board of a mobile phone, a front cover or a screen support board of a Pad or a computer, or the like. The embodiments of the present invention are not limited thereto.

It should be understood that, a specific shape of the middle frame member is not limited in an example of the present invention, and the shape of the middle frame member may be determined according to an actual use status. For example, the middle frame member may include at least one convex part or concave part, or include at least one hole. In addition, a specific shape of a metal layer on a surface of a middle frame substrate body is not limited in the embodiments of the present invention either, and the specific shape of the metal layer may be determined according to an actual use status.

<FIG> is a schematic block diagram of a method for manufacturing a middle frame member according to an aspect.

The middle frame member is a support part used for supporting components in the electronic product, and the middle frame member includes a middle frame substrate body and at least one metal-electroplated layer on a surface of the middle frame substrate body. A method <NUM> shown in <FIG> includes the following steps:.

Therefore, in this embodiment of the present invention, first metal with a high coefficient of heat conductivity is electroplated in a first area of a middle frame substrate body, and a heat-conducting capability of the middle frame member is improved by using the first metal layer, so that heat of some components that emit a large amount of heat can be effectively conducted to the middle frame substrate body in time, and excessively high partial temperature is avoided. In addition, the middle frame substrate body can conduct, as soon as possible, the heat generated by the components in an electronic device, so that heat dissipation performance of the middle frame member is improved.

It should be understood that the first area in this example of the present invention may be all or a part of the outer surface of the middle frame substrate body. For example, when the first area is all the middle frame substrate body, etching needs to be subsequently performed on a grounded conductive area and an area that is in contact with a metal spring plate, to expose the substrate body or first metal for subsequent processing. The first area may not include the grounded conductive area and the area that is in contact with the metal spring plate, and the first metal layer is electroplated in another area, to improve a heat-conducting property of the middle frame member. Alternatively, the first area may include only an area corresponding to a part that emits a relatively large amount of heat in the electronic product. For example, the first area may include only an area that emits a relatively large amount of heat, such as a camera area or a CPU area. The first metal layer is electroplated in this area, to improve a heat-conducting property of the middle frame member. Alternatively, the first area may include only a second area and/or a third area mentioned below, that is, the first metal layer may be electroplated before a second metal layer and a third metal layer are electroplated in the second area and the third area. This aspect is not limited thereto.

It should be understood that, that the first metal layer conducts heat to the middle frame substrate body may be understood as: The first metal layer conducts partial high-temperature heat to the entire first metal layer and the middle frame substrate body. Heat is horizontally conducted to the entire first metal layer and is vertically conducted to the middle frame substrate body. Horizontal conduction and vertical conduction of heat are simultaneously performed, that is, the first metal layer is used to horizontally and vertically conduct heat. In other words, the first metal layer is used to conduct, to the entire first metal layer and the middle frame substrate body, the heat generated by at least one of the components that is in contact with or adjacent to the first metal layer.

Optionally, in another aspect, the components in the electronic product include at least one of a printed circuit board PCB, a chip, a battery, or a screen.

It should be understood that the components in this aspect may further include another component in the electronic product, for example, may further include components such as an antenna and a camera. This aspect is not limited thereto. Optionally, in another aspect, the first metal layer includes any one of or a combination of the following items: a copper layer, a silver layer, or a gold layer.

For example, a thickness of the first metal layer is <NUM> to <NUM> micrometers. For example, the thickness of the first metal layer may be <NUM> micrometers, <NUM> micrometers, <NUM> micrometers, <NUM> micrometers, or the like. This aspect is not limited thereto.

Therefore, in this aspect, an overall heat-conducting capability of a die casting alloy body is improved by plating a layer of copper (Cu), silver (Ag), or gold (Au) with a high coefficient of heat conductivity on the surface. A coefficient of heat conductivity of copper Cu is <NUM> W/m. k, a coefficient of heat conductivity of silver Ag is <NUM> W/m. k, and a coefficient of heat conductivity of gold Au is <NUM> W/m. All the coefficients of heat conductivity are higher than a coefficient of heat conductivity of a middle frame substrate in an existing electronic product, and a better heat dissipation effect is provided.

Optionally, in another aspect, the middle frame substrate includes any one of or a combination of the following items: die casting aluminum alloy, die casting magnesium alloy, die casting zinc alloy, or stainless steel.

For example, the middle frame substrate may be ADC12 die casting aluminum alloy, AZ91D die casting magnesium alloy, ZA3 die casting zinc alloy, die casting aluminum and zinc alloy, die casting aluminum and magnesium alloy, stamped stainless steel, or the like. This aspect is not limited thereto.

It should be understood that, in step <NUM>, specific processing is not limited in this aspect provided that the passivated insulation layer can be formed in this aspect.

For example, in step <NUM>, chemical conversion coating processing is performed on the surface of the first metal, or a polymer organic coating is sprayed on the surface of the first metal layer. This aspect is not limited thereto.

Optionally, in another aspect, the first area includes an area that is of the middle frame substrate body and in which electricity needs to be conducted, and the method further includes:
performing depassivation processing on the area that is in the first area and in which electricity needs to be conducted, to expose the middle frame substrate body or the first metal layer.

After depassivation processing, the insulation layer is removed, and the middle frame substrate body or the first metal layer is exposed, so that the middle frame substrate body or the first metal layer can be electrically conductive to another component in the electronic product.

It should be understood that, in this aspect, depassivation processing may be performed by means of laser etching, or depassivation processing may be performed in another manner, such as a mechanical method. This is not limited in this aspect.

Further, in another aspect, the area in which electricity needs to be conducted includes a second area and/or a third area. The second area is used to electrically connect to a metal antenna spring plate in the electronic product, and the third area is used to connect to a grounded conductive component in the electronic product, to ground the middle frame member.

For example, the third area is used to come into contact with some auxiliary conductive materials such as conductive fabric and electrically conductive foam of the electronic product, so as to connect to a corresponding conductive component in the electronic product. The third area may also be referred to as a grounded conductive area.

Further, in another aspect, the method further includes: electroplating a second metal layer in the second area of the middle frame substrate body. An electrode potential difference between the second metal and the metal antenna spring plate is less than an electrode potential difference between the middle frame substrate body and the metal antenna spring plate.

It should be understood that, because different pieces of metal have different electrode potentials, there is galvanic corrosion between two different pieces of metal in contact with each other. A larger electrode potential difference between the two pieces of metal indicates severer galvanic corrosion. Second metal selected in this embodiment of the present invention meets a condition that the electrode potential difference between the second metal and the metal antenna spring plate is less than the electrode potential difference between the middle frame substrate body and the metal antenna spring plate. Therefore, galvanic corrosion between the second metal layer and the metal antenna spring plate is less than galvanic corrosion between the middle frame substrate body and the metal antenna spring plate, and when a material of the second metal layer is the same as a material of the metal antenna spring plate, that is, when the electrode potential difference between the second metal layer and the metal antenna spring plate is zero, galvanic corrosion can be avoided.

Therefore, in this aspect, the second metal layer whose electrode potential is the same as or is approximately the same as that of the metal antenna spring plate is electroplated in an area that is in contact with the gold-plated spring plate, so that galvanic corrosion can be prevented or reduced, and the middle frame member can be in fine contact with the gold-plated spring plate. Therefore, signal discontinuity is avoided, and user experience is improved.

Further, in another aspect, when a material of the metal antenna spring plate is gold, the second metal layer is a silver layer or a gold layer. For example, a thickness of the second metal layer is <NUM> to <NUM> micrometers.

It should be noted that, in a technology for enabling a frequently-used material such as die casting aluminum alloy, die casting magnesium alloy, or die casting zinc alloy of an existing middle frame to be in contact with a gold-plated antenna spring plate, signal continuity of an electronic product such as a mobile phone needs to be ensured. Currently, there is an electrode potential difference between a die casting middle frame member such as aluminum alloy, magnesium alloy, or zinc alloy and a gold element of the gold-plated spring plate. Consequently, galvanic corrosion is caused, the gold-plated spring plate cannot be in fine contact with the middle frame of the electronic product such as a mobile phone as a result of corrosion, signal discontinuity is caused, and use of a consumer is affected.

In this aspect, galvanic corrosion can be prevented or reduced by plating gold or silver in an area that is in contact with the gold-plated spring plate, so that the middle frame member can be in fine contact with the gold-plated spring plate. Therefore, signal discontinuity is avoided, and user experience is improved.

It should be understood that, in this aspect, the second metal layer may be plated in the second area in at least two cases. In a first case, when the first area includes the second area, depassivation processing is performed first, and then the second metal layer is plated. In a second case, the first area does not include the second area. Because the first metal layer is not plated in the second area, in this case, the second metal layer is directly electroplated in the second area.

Optionally, in another aspect, the method further includes:
electroplating a third metal layer in the third area of the middle frame substrate body, where a neutral salt spray corrosion resistance capability of the third metal layer is higher than that of the middle frame substrate body.

Further, in another aspect, the third metal layer is a gold layer or a silver layer. For example, a thickness of the third metal layer is <NUM> to <NUM> micrometers.

It should be noted that an existing middle frame material, especially die casting aluminum alloy or die casting magnesium alloy, has insufficient corrosion resistance performance. Particularly, when a surface of an original substrate in some areas of a mobile phone middle frame needs to be exposed by means of laser etching for grounded electric conduction, there is a risk of not resisting neutral salt spray corrosion.

In this aspect, the third metal layer is plated in the grounded conductive area, so that the neutral salt spray corrosion resistance capability is enhanced, and user experience is improved.

It should be understood that the third metal layer may be another metal layer provided that neutral salt spray corrosion resistance performance of the third metal layer is higher than that of a middle frame basis. This aspect is not limited thereto.

It should be noted that the second metal layer and the third metal layer in this embodiment of the present invention may be metal layers of a same type, and the second metal layer and the third metal layer may be simultaneously electroplated in this aspect.

When the first area includes the second area and the third area, in this aspect, depassivation processing may be first performed at positions in the first area that are corresponding to the second area and the third area, to expose the substrate body or the first metal layer, and then the second metal layer and the third metal layer are electroplated. The second area and the third area may be different areas, and the second area and the third area do not coincide with each other.

Optionally, in another aspect,
when the middle frame substrate is die casting magnesium alloy, before the electroplating a first metal layer in a first area of the middle frame substrate body, the method further includes:
performing activation processing and dip galvanization processing on the middle frame substrate body.

Correspondingly, in step <NUM>, the first metal layer is electroplated in the first area that undergoes dip galvanization processing.

Specifically, because the die casting magnesium alloy is extremely active, to simulate corrosion of the middle frame substrate, in this embodiment of the present invention, activation processing is first performed on the middle frame member in a fluoride solution, and then a dip galvanization operation is performed. A thickness of a zinc layer may be <NUM> micrometers, <NUM> micrometers, <NUM> micrometers, or the like. This is not limited in this embodiment of the present invention. The first metal layer is electroplated after dip galvanization in this embodiment of the present invention.

Optionally, in another aspect, before step <NUM>, the method may further include:
plating a metal transition layer in the first area, where both a capability of the metal transition layer to be bound with the middle frame substrate body and a capability of the metal transition layer to be bound with the first metal layer are higher than a capability of the middle frame substrate body to be bound with the first metal layer.

Correspondingly, in step <NUM>, the first metal layer is electroplated in the first area in which the metal transition layer is plated.

Further, in another aspect, a thickness of the metal transition layer is <NUM> to <NUM> micrometers.

Specifically, before the first metal layer is electroplated, in the method in this embodiment of the present invention, the metal transition layer may be plated first. The metal transition layer can play a role of transition, so that the first metal layer can be subsequently electroplated more easily.

It should be understood that a material of the metal transition layer is not limited in this embodiment of the present invention provided that both the capability of the metal transition layer to be bound with the middle frame substrate body and the capability of the metal transition layer to be bound with the first metal layer are higher than the capability of the middle frame substrate body to be bound with the first metal layer. For example, the material of the metal transition layer may be nickel. This aspect is not limited thereto.

Further, in another embodiment, before step <NUM>, the method further includes:
performing sand blasting processing and/or impurity removing processing on the middle frame substrate body, to obtain the middle frame substrate body that undergoes sand blasting processing and/or impurity removing processing.

Correspondingly, the plating a metal transition layer in the first area includes:
plating the metal transition layer in the first area of the middle frame substrate body that undergoes sand blasting processing and/or impurity removing processing.

Specifically, before the middle frame member body is obtained, in this embodiment of the present invention, sand blasting processing and/or impurity removing processing may be performed first, then the metal transition layer is plated, and finally processing such as electroplating the first metal layer is performed.

For example, in this aspect, slight sand blasting processing may be performed on the middle frame substrate body, to remove dirt such as a decoating agent on the surface and improve density of the surface, so as to subsequently improve a binding force between the substrate and a coating layer.

Then, degreasing processing, alkaline etching processing, and acid etching processing are performed on the middle frame, to remove surface oxide and another surface impurity on the middle frame member, so that a fresh substrate surface is exposed, and subsequent metal layer plating is facilitated.

It should be noted that, in the prior art, for example, ADC12 die casting aluminum alloy is used, a chemical conversion coating is covered on the die casting aluminum alloy, and areas are distinguished by means of laser etching for grounded electric conduction or coming in contact with the gold-plated spring plate. However, in the prior art, after a related substrate area is exposed by means of laser etching, there is a problem of not resisting neutral salt spray corrosion, and poor grounding may be caused. Severe galvanic corrosion is caused when the ADC12 aluminum alloy is in direct contact with the gold-plated spring plate or the gold-plated spring plate is directly disposed on the ADC12 aluminum alloy.

For the foregoing problem, in this aspect, a chemical conversion coating may be covered first, then etching is performed on a grounded conductive area and/or an area that is in contact with a gold-plated spring plate, and finally metal is plated to reduce galvanic corrosion and/or neutral salt spray corrosion. Detailed descriptions are provided below with reference to <FIG> and <FIG>.

<FIG> is a schematic block diagram of a method for manufacturing a middle frame member according to another aspect.

The middle frame member is a support part used inside an electronic product for supporting components in the electronic product, and the middle frame member includes a middle frame substrate body and at least one metal-electroplated layer on a surface of the middle frame substrate body. A method <NUM> shown in <FIG> includes the following step:
<NUM>. Electroplate a second metal layer in a second area of the middle frame substrate body, where the second area is used to connect to a metal antenna spring plate in the electronic product, and an electrode potential difference between the second metal and the metal antenna spring plate is less than an electrode potential difference between the middle frame substrate body and the metal antenna spring plate.

Therefore, in this aspect, a second metal layer whose electrode potential is the same as or is approximately the same as that of a metal antenna spring plate is electroplated in an area that is in contact with the gold-plated spring plate, so that galvanic corrosion can be prevented or reduced, and a middle frame member can be in fine contact with the gold-plated spring plate. Therefore, signal discontinuity is avoided, and user experience is improved.

It should be understood that the components in this aspect may further include another component in the electronic product, for example, may further include components such as an antenna and a camera. This aspect is not limited thereto.

Optionally, in another aspect, a material of the metal antenna spring plate is gold, and the second metal layer is a silver layer or a gold layer. For example, a thickness of the second metal layer is <NUM> to <NUM> micrometers.

Therefore, in this aspect, galvanic corrosion can be prevented or reduced by plating gold or silver in an area that is in contact with the gold-plated spring plate, so that the middle frame member can be in fine contact with the gold-plated spring plate. Therefore, signal discontinuity is avoided, and user experience is improved.

Optionally, in another aspect, the method further includes:
electroplating a third metal layer in a third area of the middle frame substrate body, where the third area is used to connect to a grounded conductive component in the electronic product, to ground the middle frame member, and a neutral salt spray corrosion resistance capability of the third metal layer is higher than that of the middle frame substrate body.

Therefore, in this aspect, the third metal layer is plated in the grounded conductive area, so that the neutral salt spray corrosion resistance capability is enhanced, and user experience is improved.

It should be noted that the second metal layer and the third metal layer in this aspect may be metal layers of a same type, and the second metal layer and the third metal layer may be simultaneously electroplated in this aspect.

The middle frame member is a support part inside an electronic product for supporting components in the electronic product, and the middle frame member includes a middle frame substrate body and at least one metal-electroplated layer on a surface of the middle frame substrate body. A method <NUM> shown in <FIG> includes the following step:
<NUM>. Electroplate a third metal layer in a third area of the middle frame substrate body, where the third area is used to connect to a grounded conductive component in the electronic product, to ground the middle frame member, and a neutral salt spray corrosion resistance capability of the third metal is higher than that of the middle frame substrate body.

Therefore, in this aspect, a third metal layer is plated in a grounded conductive area, so that a neutral salt spray corrosion resistance capability is enhanced, and user experience is improved.

It should be noted that, in this aspect, to ensure a heat-conducting property of a copper-plated layer, the copper-plated layer is pure copper and pure copper with few impurity elements, and content of copper at the copper-plated layer may be <NUM>% or more than <NUM>%. To ensure electrical conductivity and galvanic corrosion resistance performance of silver or gold, purity of a gold-plated layer or a silver-plated layer may be <NUM>% or more than <NUM>%. However, this aspect is not limited thereto.

It should be noted that, in this aspect, a copper plating process is not limited and may be cyanide copper plating, acid copper plating, pyrophosphate copper plating, cyanide-free copper plating, or the like. A silver plating process is not limited and may be cyanide silver plating or cyanide-free silver plating. A gold plating process is not limited and may be alkaline cyanide gold plating, acidic and neutral gold plating, sulphite gold plating, gold plating by using gold potassium citrate, or the like.

The foregoing describes in detail the method for manufacturing a middle frame member according to the aspects with reference to <FIG>. It should be noted that examples in <FIG> are merely intended to help persons skilled in the art understand the aspects instead of limiting the aspects to a specific value or a specific scenario shown in the examples. Apparently, persons skilled in the art can make various equivalent modifications or variations according to the examples in <FIG>, for example, properly change a metal layer thickness or a metal material, or properly reduce some unnecessary steps.

The following describes in detail a method for manufacturing a middle frame member according to aspects with reference to specific examples in <FIG>. It should be noted that descriptions in <FIG> are merely examples. According to specific actual situations, some steps or processes in the examples in <FIG> may be omitted in actual application.

A substrate of the middle frame member shown in <FIG> may be a mobile phone middle frame made of ADC12 die casting aluminum alloy. In the method in <FIG>, sand blasting processing and impurity removing processing are performed first, then copper is plated (a first metal layer is plated) on the entire middle frame member after nickel is plated (a metal transition layer is plated) on the entire middle frame member, then passivation is performed, and then depassivation is performed on some areas (a grounded conductive area and an area that is in contact with a gold-plated metal spring plate), and finally gold is plated (a second metal layer is plated) in the area (a second area) that is in contact with the gold-plated metal spring plate. Specifically,
a method <NUM> shown in <FIG> includes the following steps:.

In other words, a nickel layer herein is the foregoing metal transition layer.

Electroplate Cu on the middle frame member, where a thickness is <NUM> micrometers.

Perform chemical conversion passivation processing on the middle frame member on which Cu is electroplated.

Perform laser etching on a part that needs to be in contact with a gold-plated metal spring plate, to remove a thickness of a passivated part or a Ni-plated layer.

Perform a gold-plating operation on a laser-etched area.

Perform laser etching on a grounded conductive area, to remove a passivated layer, so as to expose a Ni-plated layer or the substrate.

It should be noted that, because a neutral salt spray corrosion resistance capability of Cu is lower than that of the substrate made of the ADC12 die casting aluminum alloy, the Ni-plated layer or the substrate needs to be exposed in step <NUM>, and exposure of a Cu layer needs to be avoided.

According to the foregoing process, a copper-plated layer with high heat conductivity and a gold-plated layer with high electrical conductivity are formed on a mobile phone middle frame made of ADC <NUM> die casting aluminum alloy. It can be learned after actual detection that, after heat dissipation, temperature of a chip area of the middle frame member that undergoes electroplating is at least <NUM> degree Celsius lower than temperature of ADC12, no middle frame corrosion phenomenon occurs in a <NUM>-hour neutral salt spray experiment, no corrosion phenomenon occurs in an area that is in contact with the gold-plated layer and that is of a gold-plated spring plate through which a radio frequency signal passes, and no signal problem caused by middle frame corrosion or galvanic corrosion generated due to contact between the middle frame and the spring plate occurs in the mobile phone.

A substrate of the middle frame member shown in <FIG> may be a mobile phone middle frame made of AZ91D die casting magnesium alloy. In the method in <FIG>, sand blasting processing and impurity removing processing are performed first, then dip galvanization processing is performed on the entire middle frame member, then copper is plated (a first metal layer is plated) on the entire middle frame member after nickel is plated (a metal transition layer is plated) on the entire middle frame member, then passivation is performed, and then depassivation is performed on some areas (a grounded conductive area and an area that is in contact with a gold-plated metal spring plate), and finally gold is plated (a second metal layer and a third metal layer are plated) in the grounded conductive area (a third area) and the area (a second area) that is in contact with the gold-plated metal spring plate.

Specifically, a method <NUM> shown in <FIG> includes the following steps:.

According to the foregoing process, a copper-plated layer with high heat conductivity and a gold-plated layer with high electrical conductivity are formed on a mobile phone middle frame made of AZ91D die casting aluminum alloy. It can be learned after actual detection that, after heat dissipation, temperature of a chip area of the middle frame member that undergoes electroplating is at least <NUM> degree Celsius lower than temperature of AZ91D, no middle frame corrosion phenomenon occurs in a <NUM>-hour neutral salt spray experiment, no corrosion phenomenon occurs in an area that is in contact with the gold-plated layer and that is of a gold-plated spring plate through which a radio frequency signal passes, and no signal problem caused by middle frame corrosion or galvanic corrosion generated due to contact between the middle frame and the spring plate occurs in the mobile phone.

A substrate of the middle frame member shown in <FIG> may be a mobile phone middle frame made of ZA3 die casting zinc alloy. In the method in <FIG>, sand blasting processing and impurity removing processing are performed first, then copper is plated (a first metal layer is plated) on the entire middle frame member after nickel is plated (a metal transition layer is plated) on the entire middle frame member, then passivation is performed, and then depassivation is performed on some areas (a grounded conductive area and an area that is in contact with a gold-plated metal spring plate), and finally gold is plated (a second metal layer and a third metal layer are plated) in the grounded conductive area (a third area) and the area (a second area) that is in contact with the gold-plated metal spring plate.

According to the foregoing process, a copper-plated layer with high heat conductivity and a gold-plated layer with high electrical conductivity are formed on a mobile phone middle frame made of ZA3 die casting zinc alloy. It can be learned after actual detection that, after heat dissipation, temperature of a chip area of the middle frame member that undergoes electroplating is at least <NUM> degrees Celsius lower than temperature of the ZA3 die casting zinc alloy, no middle frame corrosion phenomenon occurs in a <NUM>-hour neutral salt spray experiment, no corrosion phenomenon occurs in an area that is in contact with the gold-plated layer and that is of a gold-plated spring plate through which a radio frequency signal passes, and no signal problem caused by middle frame corrosion or galvanic corrosion generated due to contact between the middle frame and the spring plate occurs in the mobile phone.

A substrate of the middle frame member shown in <FIG> may be a mobile phone middle frame made of die casting aluminum and zinc alloy. In the method in <FIG>, sand blasting processing and impurity removing processing are performed first, then copper is plated (a first metal layer is plated) on the entire middle frame member after nickel is plated (a metal transition layer is plated) on the entire middle frame member, then passivation processing is performed, and then depassivation is performed on some areas (a grounded conductive area and an area that is in contact with a gold-plated metal spring plate), and finally silver is plated (a second metal layer and a third metal layer are plated) in the grounded conductive area (a third area) and the area (a second area) that is in contact with the gold-plated metal spring plate.

According to the foregoing process, a copper-plated layer with high heat conductivity and a gold-plated layer with high electrical conductivity are formed on a mobile phone middle frame made of die casting aluminum and zinc alloy. It can be learned after actual detection that, after heat dissipation, temperature of a chip area of the middle frame member that undergoes electroplating is at least <NUM> degrees Celsius lower than temperature of the aluminum and zinc alloy, no middle frame corrosion phenomenon occurs in a <NUM>-hour neutral salt spray experiment, no corrosion phenomenon occurs in an area that is in contact with the gold-plated layer and that is of a gold-plated spring plate through which a radio frequency signal passes, and no signal problem caused by middle frame corrosion or galvanic corrosion generated due to contact between the middle frame and the spring plate occurs in the mobile phone.

A substrate of the middle frame member shown in <FIG> may be a mobile phone middle frame made of ADC12 die casting aluminum alloy. In the method in <FIG>, sand blasting processing and impurity removing processing are performed first, then silver is plated (a first metal layer is plated) on the entire middle frame member after nickel is plated (a metal transition layer is plated) on the entire middle frame member, then passivation processing is performed, and then depassivation is performed on some areas (a grounded conductive area and an area that is in contact with a gold-plated metal spring plate).

According to the foregoing process, a silver-plated layer with high heat conductivity and high heat conductivity is formed on a mobile phone middle frame made of ADC12 die casting aluminum alloy. It can be learned after actual detection that, after heat dissipation, temperature of a chip area of the middle frame member that undergoes electroplating is at least <NUM> degrees Celsius lower than temperature of ADC12, no middle frame corrosion phenomenon occurs in a <NUM>-hour neutral salt spray experiment, no corrosion phenomenon occurs in an area that is in contact with the silver-plated layer and that is of a gold-plated spring plate through which a radio frequency signal passes, and no signal problem caused by middle frame corrosion or galvanic corrosion generated due to contact between the middle frame and the spring plate occurs in the mobile phone.

A substrate of the middle frame member shown in <FIG> may be a mobile phone middle frame made of die casting aluminum and magnesium alloy. In the method in <FIG>, sand blasting processing and impurity removing processing are performed first, then chemical conversion coating processing is performed on the entire middle frame member, then laser etching is performed on some areas (corresponding to an area that emits a relatively large amount of heat, a grounded conductive area, and an area that is in contact with a gold-plated metal spring plate), then copper is plated (a first metal layer is plated) after nickel is plated (a metal transition layer is plated) in the areas, and finally gold is plated (a second metal layer and a third metal layer are plated) in the areas.

According to the foregoing process, a copper-plated layer with high heat conductivity and a gold-plated layer with high electrical conductivity are formed in some areas of a mobile phone middle frame made of die casting aluminum and magnesium alloy. It can be learned from actual detection that, after heat dissipation, temperature of a chip area of the middle frame member that undergoes electroplating is at least <NUM> degree Celsius lower than temperature of the mobile phone middle frame made of die casting aluminum and magnesium alloy, no middle frame phenomenon corrosion occurs in an <NUM>-hour neutral salt spray experiment, no corrosion phenomenon occurs in an area that is in contact with the gold-plated layer and that is of a gold-plated spring plate through which a radio frequency signal passes, and no signal problem caused by middle frame corrosion or galvanic corrosion generated due to contact between the middle frame and the spring plate occurs in the mobile phone.

A substrate of the middle frame member shown in <FIG> may be a mobile phone middle frame made of stamped stainless steel. In the method in <FIG>, sand blasting processing and impurity removing processing are performed first, then copper is plated (a first metal layer is plated) on the entire middle frame member after nickel is plated (a metal transition layer is plated) on the entire middle frame member, then passivation is performed, and then depassivation is performed on some areas (a grounded conductive area and an area that is in contact with a gold-plated metal spring plate), and finally gold is plated (a second metal layer is plated) in the area (a second area) that is in contact with the gold-plated metal spring plate.

According to the foregoing process, a copper-plated layer with high heat conductivity and a gold-plated layer with high electrical conductivity are formed on a mobile phone middle frame made of stainless steel. It can be learned from actual detection that, after heat dissipation, temperature of a chip area of the middle frame member that undergoes electroplating is at least <NUM> degrees Celsius lower than temperature of the stainless steel, no middle frame corrosion phenomenon occurs in a <NUM>-hour neutral salt spray experiment, no corrosion phenomenon occurs in an area that is in contact with the gold-plated layer and that is of a gold-plated spring plate through which a radio frequency signal passes, and no signal problem caused by middle frame corrosion or galvanic corrosion generated due to contact between the middle frame and the spring plate occurs in the mobile phone.

It should be noted that examples in <FIG> are merely intended to help persons skilled in the art understand the aspects of limiting the aspects invention to a specific value or a specific scenario shown in the examples. Apparently, persons skilled in the art can make various equivalent modifications or variations according to the examples in <FIG>, for example, properly change a metal layer thickness or a metal material, or properly reduce some unnecessary.

For example, dirt removing and impurity removing processing may not need to be performed in the embodiments of the present invention, or no transition layer (no nickel) needs to be plated in the aspects.

In the aspects, gold or silver may be plated only in an area that is in contact with a gold-plated spring plate, or gold or silver may be plated in an area that is in contact with a gold-plated spring plate, and gold or silver may also be plated in a grounded conductive area. In addition, in the aspects, copper may be only electroplated in some areas, for example, copper may be plated in an area other than a grounded conductive area and an area that needs to be in contact with a gold-plated spring plate. In this way, no laser etching is required in subsequent processing, but gold or silver is directly plated in the grounded conductive area and the area that is in contact with the gold-plated spring plate. Alternatively, copper or silver may be electroplated on the entire the middle frame member, then laser etching is performed on an area other than a grounded conductive area and an area that needs to be in contact with a gold-plated spring plate, to remove a passivated layer, and then subsequent processing is performed.

The foregoing describes in detail the method for manufacturing a middle frame member according to the aspects with reference to <FIG>. The following describes in detail a middle frame member in the embodiments of the present invention with reference to <FIG>.

<FIG> is a schematic block diagram of a middle frame member according to an embodiment of the present invention. A middle frame member <NUM> shown in <FIG> is a support part inside an electronic product for supporting components in the electronic product. It should be noted that the middle frame member <NUM> shown in <FIG> is corresponding to the method in <FIG>, and may be obtained by means of manufacturing according to the method in <FIG>. For components and functions of the middle frame member <NUM> in <FIG>, refer to the description in the foregoing method. To avoid repetition, details are not described herein.

It should be understood that <FIG> is merely an example, and a size and a shape of the middle frame member in <FIG> are merely examples. A specific shape of the middle frame member is determined according to actual use. This is not limited in this embodiment of the present invention. In addition, a first area shown in <FIG> is an area, other than a conductive area, on an outer surface of a middle frame substrate body. However, this embodiment of the present invention is not limited thereto. For example, the first area may be all or a part of the outer surface of the middle frame substrate body, for example, the first area may be an area that emits a relatively large amount of heat, or the first area may include a conductive area. For brevity, no more figures are presented in this embodiment of the present invention.

In other words, according to context of this embodiment of the present invention, corresponding variations may be made to a structure and the shape of the middle frame member. For example, the middle frame member may further include a second metal layer, or may further include a third metal layer, and may further include a metal transition layer. Such modifications also fall within the scope of the embodiments of the present invention. For brevity, no more figures are presented in this embodiment of the present invention.

Specifically, the middle frame member <NUM> shown in <FIG> includes a middle frame substrate body <NUM>, a first metal layer <NUM>, and a passivated insulation layer <NUM>.

The first metal layer <NUM> is attached to a first area of the middle frame substrate body <NUM>. A coefficient of heat conductivity of the first metal layer is greater than a coefficient of heat conductivity of the middle frame substrate body, the first area includes all or a part of an outer surface of the middle frame substrate body, and the first metal layer is used to conduct, to the middle frame substrate body, heat generated by at least one of the components that is in contact with or adjacent to the first metal layer.

The passivated insulation layer <NUM> is attached to a surface of the first metal layer, and can resist corrosion and is insulated.

Therefore, in this embodiment of the present invention, first metal with a high coefficient of heat conductivity is attached to a first area of a middle frame substrate body, and a heat-conducting capability of the middle frame member is improved by using the first metal layer, so that heat of some components that emit a large amount of heat can be effectively conducted to the middle frame substrate body in time, and excessively high partial temperature is avoided. In addition, the middle frame substrate body can conduct, as soon as possible, the heat generated by the components in an electronic device, so that heat dissipation performance of the middle frame member is improved.

Optionally, in another embodiment, the components in the electronic product include at least one of a printed circuit board PCB, a chip, a battery, or a screen.

It should be understood that the components in this embodiment of the present invention may further include another component in the electronic product, for example, may further include components such as an antenna and a camera. This embodiment of the present invention is not limited thereto.

Optionally, in another embodiment, the passivated insulation layer is obtained after chemical conversion coating processing is performed on the surface of the first metal or a polymer organic coating is sprayed on the surface of the first metal layer.

It should be understood that the passivated insulation layer may be obtained in another manner in this embodiment of the present invention. This embodiment of the present invention is not limited thereto.

Optionally, in another embodiment, the first metal layer includes any one of or a combination of the following items: a copper layer, a silver layer, or a gold layer. A thickness of the first metal layer may be <NUM> to <NUM> micrometers.

Therefore, in this embodiment of the present invention, an overall heat-conducting capability of a die casting alloy body is improved by plating a layer of copper (Cu), silver (Ag), or gold (Au) with a high coefficient of heat conductivity on the surface. A coefficient of heat conductivity of copper Cu is <NUM> W/m. k, a coefficient of heat conductivity of silver Ag is <NUM> W/m. k, and a coefficient of heat conductivity of gold Au is <NUM> W/m. All the coefficients of heat conductivity are higher than a coefficient of heat conductivity of a middle frame substrate in an existing electronic product, and a better heat dissipation effect is provided.

Optionally, in another embodiment, the first area includes all or a part of the outer surface of the middle frame substrate body except an area in which electricity needs to be conducted. The first metal layer is attached to the area that is on the outer surface of the middle frame substrate body and in which electricity needs to be conducted.

In other words, the first metal layer is specifically attached to the first area and the area in which electricity needs to be conducted. The passivated insulation layer is attached only to the surface of the first metal layer corresponding to the first area.

Optionally, in another embodiment, the area in which electricity needs to be conducted includes a second area and/or a third area. The second area is used to connect to a metal antenna spring plate in the electronic product, and the third area is used to connect to a grounded conductive component in the electronic product, to ground the middle frame member.

It should be understood that, in this embodiment of the present invention, depassivation processing may be performed by means of laser etching, or depassivation processing may be performed in another manner, such as a mechanical method. This is not limited in this embodiment of the present invention.

Optionally, in another embodiment, the middle frame member further includes:
a second metal layer, attached to the second area on the surface of the middle frame substrate body, where an electrode potential difference between the second metal layer and the metal antenna spring plate is less than an electrode potential difference between the middle frame substrate body and the metal antenna spring plate.

Therefore, in this embodiment of the present invention, the second metal layer whose electrode potential is the same as or is approximately the same as that of the metal antenna spring plate is attached to an area that is in contact with the gold-plated spring plate, so that galvanic corrosion can be prevented or reduced, and the middle frame member can be in fine contact with the gold-plated spring plate. Therefore, signal discontinuity is avoided, and user experience is improved.

Further, in another embodiment, when a material of the metal antenna spring plate is gold, the second metal layer is a silver layer or a gold layer. For example, a thickness of the second metal layer is <NUM> to <NUM> micrometers.

In this embodiment of the present invention, galvanic corrosion can be prevented or reduced by disposing a gold layer or a silver layer in an area that is in contact with the gold-plated spring plate, so that the middle frame member can be in fine contact with the gold-plated spring plate. Therefore, signal discontinuity is avoided, and user experience is improved.

It should be understood that, in this embodiment of the present invention, the second area may be obtained in the following manners. For example, the second metal layer may be disposed in at least the following two cases. In a first case, when the first area includes the second area, depassivation processing is performed first, and then the second metal layer is plated. In a second case, the first area does not include the second area. Because the first metal layer is not plated in the second area, in this case, the second metal layer is directly electroplated in the second area.

Optionally, in another embodiment, the middle frame member may further include:
a third metal layer, attached to the third area on the surface of the middle frame substrate body, where a neutral salt spray corrosion resistance capability of the third metal layer is higher than that of the middle frame substrate body.

Further, in another embodiment, the third metal layer is a gold layer or a silver layer.

A thickness of the third metal layer is <NUM> to <NUM> micrometers.

In this embodiment of the present invention, the third metal layer is plated in the grounded conductive area, so that the neutral salt spray corrosion resistance capability is enhanced, and user experience is improved.

It should be understood that the third metal layer may be another metal layer provided that neutral salt spray corrosion resistance performance of the third metal layer is higher than that of a middle frame basis. This embodiment of the present invention is not limited thereto.

It should be noted that the second metal layer and the third metal layer in this embodiment of the present invention may be metal layers of a same type, and the second metal layer and the third metal layer may be simultaneously electroplated in this embodiment of the present invention.

When the first area includes the second area and the third area, in this embodiment of the present invention, depassivation processing may be first performed at positions in the first area that are corresponding to the second area and the third area, to expose the substrate body or the first metal layer, and then the second metal layer and the third metal layer are electroplated. The second area and the third area may be different areas, and the second area and the third area do not coincide with each other.

Optionally, in another embodiment, the middle frame substrate includes any one of or a combination of the following items: die casting aluminum alloy, die casting magnesium alloy, die casting zinc alloy, or stainless steel.

For example, the middle frame substrate may be ADC12 die casting aluminum alloy, AZ91D die casting magnesium alloy, ZA3 die casting zinc alloy, die casting aluminum and zinc alloy, die casting aluminum and magnesium alloy, stamped stainless steel, or the like. This embodiment of the present invention is not limited thereto.

Optionally, in another embodiment, when the middle frame substrate is die casting magnesium alloy, the middle frame member further includes:
a zinc layer, located between the first metal layer and the middle frame substrate body, where the zinc layer is obtained after activation processing and dip galvanization processing are performed on the middle frame substrate body.

Specifically, because the die casting magnesium alloy is extremely active, to simulate corrosion of the middle frame substrate, in this embodiment of the present invention, activation processing is first performed on the middle frame member in a fluoride solution, and then a dip galvanization operation is performed. A thickness of the zinc layer may be <NUM> micrometers, <NUM> micrometers, <NUM> micrometers, or the like. This is not limited in this embodiment of the present invention. The first metal layer is electroplated after dip galvanization in this embodiment of the present invention.

Optionally, in another embodiment, the middle frame member further includes:
a metal transition layer, located between the first metal layer and the middle frame substrate body, where both a capability of the metal transition layer to be bound with the middle frame substrate body and a capability of the metal transition layer to be bound with the first metal layer are higher than a capability of the middle frame substrate body to be bound with the first metal layer.

Further, in another embodiment, a thickness of the metal transition layer is <NUM> to <NUM> micrometers.

It should be understood that a material of the metal transition layer is not limited in this embodiment of the present invention provided that both the capability of the metal transition layer to be bound with the middle frame substrate body and the capability of the metal transition layer to be bound with the first metal layer are higher than the capability of the middle frame substrate body to be bound with the first metal layer. For example, the material of the metal transition layer may be nickel. This embodiment of the present invention is not limited thereto.

Optionally, in another embodiment, the middle frame substrate body is a middle frame substrate body that undergoes sand blasting processing and/or impurity removing processing.

Specifically, during generation of the middle frame member, before the middle frame member body is obtained, in this embodiment of the present invention, sand blasting processing and/or impurity removing processing may be performed first, then the metal transition layer is plated, and finally processing such as electroplating the first metal layer is performed.

For example, during generation of the middle frame member, in this embodiment of the present invention, slight sand blasting processing may be performed on the middle frame substrate body, to remove dirt such as a decoating agent on the surface and improve density of the surface, so as to subsequently improve a binding force between the substrate and a coating layer.

<FIG> is a schematic block diagram of a middle frame member according to another embodiment of the present invention. A middle frame member <NUM> shown in <FIG> is a support part used in an electronic product. It should be noted that the middle frame member <NUM> shown in <FIG> is corresponding to the method in <FIG>, and may be obtained by means of manufacturing according to the method in <FIG>. For components and functions of the middle frame member <NUM> in <FIG>, refer to the description in the foregoing method. To avoid repetition, details are not described herein.

It should be understood that <FIG> is merely an example, and a size and a shape of the middle frame member in <FIG> are merely examples. A specific shape of the middle frame member is determined according to actual use. This is not limited in this embodiment of the present invention. In addition, according to context of this embodiment of the present invention, corresponding variations may be made to a structure and the shape of the middle frame member. For example, the middle frame member may further include a first metal layer, a third metal layer, and the like, and may further include a metal transition layer. Such modifications also fall within the scope of the embodiments of the present invention. To avoid repetition, no more figures are presented in this embodiment of the present invention.

Specifically, the middle frame member <NUM> shown in <FIG> includes a substrate body <NUM> and a second metal layer <NUM>.

The second metal <NUM> is attached to a second area on a surface of the middle frame substrate body <NUM>. The second area is used to connect to a metal antenna spring plate in the electronic product, and an electrode potential difference between the second metal and the metal antenna spring plate is less than an electrode potential difference between the middle frame substrate body and the metal antenna spring plate.

Therefore, in this embodiment of the present invention, a second metal layer whose electrode potential is the same as or is approximately the same as that of a metal antenna spring plate is attached to an area that is in contact with the gold-plated spring plate, so that galvanic corrosion can be prevented or reduced, and a middle frame member can be in fine contact with the gold-plated spring plate. Therefore, signal discontinuity is avoided, and user experience is improved.

Optionally, in another embodiment, components in the electronic product include at least one of a printed circuit board PCB, a chip, a battery, or a screen.

Optionally, in another embodiment, when a material of the metal antenna spring plate is gold, the second metal layer is a silver layer or a gold layer. For example, a thickness of the second metal layer is <NUM> to <NUM> micrometers.

Therefore, in this embodiment of the present invention, galvanic corrosion can be prevented or reduced by disposing a gold layer, a silver layer, or the like in an area that is in contact with the gold-plated spring plate, so that the middle frame member can be in fine contact with the gold-plated spring plate. Therefore, signal discontinuity is avoided, and user experience is improved.

Optionally, in another embodiment, the middle frame member may further include:
a third metal layer, attached to a third area on the surface of the middle frame substrate body, where the third area is connected to a grounded conductive component in the electronic product, to ground the middle frame member, and a neutral salt spray corrosion resistance capability of the third metal layer is higher than that of the middle frame substrate body.

Optionally, in another embodiment, the third metal layer is a gold layer or a silver layer.

For example, a thickness of the third metal layer is <NUM> to <NUM> micrometers.

Therefore, in this embodiment of the present invention, the third metal layer is disposed in the grounded conductive area, so that the neutral salt spray corrosion resistance capability is enhanced, and user experience is improved.

It should be understood that <FIG> is merely an example, and a size and a shape of the middle frame member in <FIG> are merely examples. A specific shape of the middle frame member is determined according to actual use. This is not limited in this embodiment of the present invention. In addition, according to context of this embodiment of the present invention, corresponding variations may be made to a structure and the shape of the middle frame member. For example, the middle frame member may further include a first metal layer, a third metal layer, a metal transition layer, and the like. Such modifications also fall within the scope of the embodiments of the present invention. To avoid repetition, no more figures are presented in this embodiment of the present invention.

Specifically, the middle frame member <NUM> shown in <FIG> includes a substrate body <NUM> and a third metal layer <NUM>.

The third metal layer <NUM> is attached to a third area on a surface of the middle frame substrate body. The third area is used to connect to a grounded conductive component in the electronic product, to ground the middle frame member, and a neutral salt spray corrosion resistance capability of the third metal layer is higher than that of the middle frame substrate body.

Optionally, in another embodiment, the third metal layer is a gold layer or a silver layer. A thickness of the third metal layer is <NUM> to <NUM> micrometers.

Therefore, in this embodiment of the present invention, a third metal layer is disposed in a grounded conductive area, so that a neutral salt spray corrosion resistance capability is enhanced, and user experience is improved.

<FIG> is a schematic block diagram of an electronic product according to another embodiment of the present invention. An electronic product <NUM> shown in <FIG> includes the middle frame member <NUM> shown in <FIG>, a component <NUM>, and a housing <NUM>. The component <NUM> is accommodated in the housing <NUM>, the middle frame member <NUM> is configured to support the component <NUM>, and the middle frame member <NUM> and the housing <NUM> are assembled together. The housing <NUM> may be configured to protect the middle frame member <NUM> and the component <NUM>.

For example, the electronic product <NUM> may include but is not limited to a mobile phone, a Pad, a computer, an ebook, a mobile station, and the like provided that this component includes a middle frame member, a component supported by the middle frame member, and a housing. This embodiment of the present invention is not limited thereto.

It should be understood that the component <NUM> may include at least one of a printed circuit board PCB, a chip, a battery, or a screen.

It should be understood that the component in this embodiment of the present invention may further include another component, for example, may further include components such as an antenna and a camera. This embodiment of the present invention is not limited thereto.

For example, <FIG> is a structural block diagram when the electronic product <NUM> is a mobile phone. An electronic mobile phone <NUM> shown in <FIG> may include: a screen, such as a touch panel (Touch Panel, TP) and a liquid crystal display (Liquid crystal display, LCD), that is, a TP-LCD; a middle frame member; a battery; a mainboard, where the mainboard may include a printed circuit board PCB, a chip, a camera, and the like; an antenna support, where the antenna support may be used for placing an antenna; and a housing, such as a battery cover assembly.

It should be understood that <FIG> is merely an example, and shapes and structures of product components shown in <FIG> are merely examples. Specific shapes and positions of the components are changed according to actual use. This is not limited in this embodiment of the present invention.

It should be understood that "an embodiment" or "an embodiment" mentioned in the entire specification does not mean that particular features, structures, or characteristics related to the embodiment are included in at least one embodiment of the present invention. Therefore, "in an embodiment" or "in an embodiment" appearing throughout the specification does not necessarily indicate a same embodiment. In addition, these particular features, structures, or characteristics may be combined in one or more embodiments in any appropriate manner. It should be understood that sequence numbers of the foregoing processes do not mean execution sequences in various embodiments of the present invention. The execution sequences of the processes should be determined according to functions and internal logic of the processes, and should not be construed as any limitation on the implementation processes of the embodiments of the present invention.

The term "and/or" in this specification describes only an association relationship for describing associated objects and represents that three relationships may exist.

It should be understood that in the embodiments of the present invention, "B corresponding to A" indicates that B is associated with A, and B may be determined according to A. However, it should further be understood that determining A according to B does not mean that B is determined according to A only; that is, B may also be determined according to A and/or other information.

Claim 1:
A middle frame member (<NUM>), wherein the middle frame member (<NUM>) is a support part configured to be placed inside an electronic product (<NUM>) for supporting components in the electronic product, and the middle frame member (<NUM>) comprises:
a middle frame substrate body (<NUM>);
a first metal layer (<NUM>), attached to a first area of the middle frame substrate body (<NUM>), wherein a coefficient of heat conductivity of the first metal layer (<NUM>) is greater than a coefficient of heat conductivity of the middle frame substrate body (<NUM>), the first area comprises all or a part of an outer surface of the middle frame substrate body (<NUM>), and the first metal layer (<NUM>) is configured to conduct, to the middle frame substrate body (<NUM>), heat generated by at least one of the components that is in contact with or adjacent to the first metal layer (<NUM>),
such that heat is horizontally conducted to the entire first metal layer (<NUM>) and is vertically conducted to the middle frame substrate body (<NUM>); and
a passivated insulation layer (<NUM>), attached to a surface of the first metal layer (<NUM>),
characterized in that
the middle frame body (<NUM>) further comprises an area configured to conduct electricity,
wherein the first area comprises all or a part of the outer surface of the middle frame substrate body (<NUM>) except the area configured to conduct electricity; and
the first metal layer (<NUM>) is further attached to the area that is on the outer surface of the middle frame substrate body (<NUM>) and that is configured to conduct electricity.