CN113905556A

CN113905556A - Shell, manufacturing method thereof and electronic equipment

Info

Publication number: CN113905556A
Application number: CN202111136254.2A
Authority: CN
Inventors: 于宗强
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2021-09-27
Filing date: 2021-09-27
Publication date: 2022-01-07

Abstract

The application provides a shell, a manufacturing method thereof and electronic equipment, wherein the shell comprises a main body part and a plurality of protruding parts, and the main body part comprises a first surface and a second surface which are oppositely arranged; the plurality of convex parts are distributed on the first surface in an array manner; wherein the cross-sectional area of the boss decreases gradually along the first surface toward a direction away from the second surface; the shell is made of black materials, and the cross section of the shell is a plane parallel to the first surface. The casing that this application embodiment provided is through adopting black material to make the casing to at the bellying of housing face formation cross sectional area gradual change, with the reflectivity that reduces housing face, realize integrative black outward appearance effect, thereby make the casing can show blacker visual effect in the outward appearance effect.

Description

Shell, manufacturing method thereof and electronic equipment

Technical Field

The application relates to the technical field of electronic equipment, in particular to a shell, a manufacturing method of the shell and the electronic equipment.

Background

With the continuous development of electronic devices, the electronic devices have become indispensable entertainment tools and social tools in people's daily life, and people's demand for the electronic devices is also higher and higher. Taking a mobile phone as an example, the black mobile phone back shell can give a classic and high-end feeling to people. However, the existing black mobile phone back shell has insufficient blackness and has certain grayness.

Disclosure of Invention

An aspect of an embodiment of the present application provides a housing, where the housing includes a main body portion and a plurality of protruding portions, where the main body portion includes a first surface and a second surface that are disposed opposite to each other; the plurality of convex parts are distributed on the first surface in an array manner; wherein the cross-sectional area of the boss decreases gradually along the first surface toward a direction away from the second surface; the shell is made of black materials, and the cross section of the shell is a plane parallel to the first surface.

Another aspect of the embodiments of the present application provides a method for manufacturing a housing, where the method includes: providing a black material; melting the black material and injecting the melted black material into a mold to form the shell; the shell comprises a main body part and a plurality of convex parts, wherein the main body part is provided with a first surface and a second surface which are oppositely arranged; the plurality of convex parts are distributed on the first surface in an array manner; the cross section area of the bulge part is gradually reduced from the first surface to the direction departing from the second surface, and the cross section is a plane parallel to the first surface.

The embodiment of the application also provides electronic equipment, which comprises a display screen, a middle frame and the shell in the embodiment; the display screen is connected with one side of the middle frame, and the shell is connected with the other opposite side of the middle frame.

The shell, the manufacturing method of the shell and the electronic equipment are characterized in that the shell is made of black materials, and the protruding portion with gradually changed cross section area is formed on the surface of the shell, so that the reflectivity of the surface of the shell is reduced, the integral black appearance effect is achieved, and the shell can show a blacker visual effect in the appearance effect.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic diagram of an electronic device in some embodiments of the present application;

FIG. 2 is a schematic diagram of the electronic device in FIG. 1 with a split structure;

FIG. 3 is a schematic structural view of a housing according to some embodiments of the present application;

FIG. 4 is a schematic view of a portion of the area A in the embodiment of FIG. 3;

FIG. 5 is a schematic sectional view of the housing of FIG. 3 taken along the line B-B;

FIG. 6 is a schematic view of a boss according to some embodiments of the present application;

fig. 7 to 9 respectively illustrate the light reflection routes corresponding to different inclination angles;

FIG. 10 is a scatter plot of the results of a reflectance test of the surface of a housing according to some embodiments of the present application;

FIG. 11 is a schematic illustration of the housing of other embodiments of the present application;

FIG. 12 is a schematic flow chart of a method of making a housing according to some embodiments of the present application;

FIG. 13 is a schematic view of a portion of the mold in accordance with some embodiments of the present application;

FIG. 14 is a flow chart illustrating a method of fabricating a housing according to further embodiments of the present application.

Detailed Description

The present application will be described in further detail with reference to the following drawings and examples. It is to be noted that the following examples are only illustrative of the present application, and do not limit the scope of the present application. Likewise, the following examples are only some examples and not all examples of the present application, and all other examples obtained by a person of ordinary skill in the art without any inventive work are within the scope of the present application.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

As used herein, an "electronic device" (or simply "terminal") includes, but is not limited to, an apparatus that is configured to receive/transmit communication signals via a wireline connection, such as via a Public Switched Telephone Network (PSTN), a Digital Subscriber Line (DSL), a digital cable, a direct cable connection, and/or another data connection/network, and/or via a wireless interface (e.g., for a cellular network, a Wireless Local Area Network (WLAN), a digital television network such as a DVB-H network, a satellite network, an AM-FM broadcast transmitter, and/or another communication terminal). A communication terminal arranged to communicate over a wireless interface may be referred to as a "wireless communication terminal", "wireless terminal" or "mobile terminal". Examples of mobile terminals include, but are not limited to, satellite or cellular telephones; a Personal Communications System (PCS) terminal that may combine a cellular radiotelephone with data processing, facsimile and data communications capabilities; PDAs that may include radiotelephones, pagers, internet/intranet access, Web browsers, notepads, calendars, and/or Global Positioning System (GPS) receivers; and conventional laptop and/or palmtop receivers or other electronic devices that include a radiotelephone transceiver. A cellular phone is an electronic device equipped with a cellular communication module.

Referring to fig. 1 and fig. 2, fig. 1 is a schematic structural diagram of an electronic device 100 according to some embodiments of the present application, and fig. 2 is a schematic structural diagram of the electronic device 100 according to fig. 1.

The electronic device 100 provided in the embodiment of the present application may specifically be a mobile phone, a tablet computer, a notebook computer, and the like, and the following description will be given by taking the electronic device 100 as a mobile phone. The electronic device 100 may include a display screen 10, a bezel 20, and a housing 30. Wherein the display screen 10 may be connected to one side of the middle frame 20, and the case 30 may be connected to the other opposite side of the middle frame 20. All directional indications (such as up, down, left, right, front, and rear … …) in the embodiments of the present application are only used to explain the relative positional relationship between the components, the movement, and the like in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indication is changed accordingly.

Specifically, the display screen 10 may be used to provide an image display function for the electronic device 100, and the display screen 10 may be covered on one side of the middle frame 20, and may be fixed by an adhesive. The display screen 10 may include a transparent cover plate, a touch panel, and a display panel, which are sequentially stacked. The surface of the transparent cover plate can have the characteristics of flatness and smoothness, so that a user can conveniently perform touch operations such as clicking, sliding and pressing. The transparent cover plate may be made of a rigid material such as glass, or may be made of a flexible material such as Polyimide (PI) or Colorless Polyimide (CPI). The touch panel is disposed between the transparent cover and the display panel, and is configured to respond to a touch operation of a user, convert the touch operation into an electrical signal, and transmit the electrical signal to the processor of the electronic device 100, so that the electronic device 100 can make a corresponding response to the touch operation of the user. The display panel is mainly used for displaying pictures and can be used as an interactive interface to instruct a user to perform the touch operation on the transparent cover plate. The Display panel may adopt an OLED (Organic Light-Emitting Diode) or an LCD (Liquid Crystal Display) to realize an image Display function of the electronic device 100. In this embodiment, the transparent cover plate, the touch panel and the display panel may be attached together by using an optical Adhesive (OCA) or a Pressure Sensitive Adhesive (PSA). Meanwhile, the display screen 10 may be a double curved screen or a four curved screen in appearance to reduce a black edge of the display screen 10 and increase a visible area of the display screen 10. Accordingly, the display screen 10 may be a conventional flat screen, and only the display screen 10 can implement the graphic display function of the electronic device 100.

As shown in fig. 2, the middle frame 20 may include a middle plate 21 and a side frame 22 that are integrally formed, and they may be integrally formed by injection molding, punch forming, heat absorption forming, or the like. The frame 22 may be formed by extending the side wall of the middle plate 21 in the thickness direction of the middle plate 21, so that both sides of the middle frame 20 opposite to each other may form a corresponding open structure. The display screen 10 and the casing 30 may respectively cover the open structures on two opposite sides of the middle frame 20, so as to form an accommodating space of the electronic device 100 together with the middle frame 20. The accommodating space may be used for mounting electronic devices required by the electronic apparatus 100, such as a battery, a sensor, a circuit board, a camera, and the like. In some embodiments, the middle plate 21 and the side frame 22 may also be two independent structural members, and the two may be connected by one of assembling methods such as clamping, bonding, welding, and the like, and a combination thereof. Alternatively, the middle frame 20 may include only the bezel 22.

In addition, the material of the middle frame 20 may be glass, metal, hard plastic, etc., so that the middle frame 20 has a certain structural strength. Because the middle frame 20 is generally directly exposed to the external environment, the middle frame 20 may also have certain wear-resistant, corrosion-resistant, scratch-resistant, and other properties, or the outer surface of the middle frame 20 (i.e., the outer surface of the electronic device 100) may be coated with a layer of functional material for wear-resistant, corrosion-resistant, scratch-resistant, and the like. In addition, in some embodiments, a corresponding brand identifier (LOGO) may be further disposed on the middle frame 20 to beautify the appearance of the electronic device 100 and improve brand recognition.

Referring to fig. 3 to 5, fig. 3 is a schematic structural diagram of a housing 30 in some embodiments of the present disclosure, fig. 4 is a schematic partial enlarged structural diagram of a region a in the embodiment of fig. 3, and fig. 5 is a schematic sectional structural diagram of the housing 30 in the embodiment of fig. 3 along a direction B-B. The housing 30 may be a battery cover/a rear cover of the electronic device 100, that is, the housing 30 may be used to protect various functional devices in the accommodating space.

The material of the housing 30 may be glass fiber, Polycarbonate (PC), polymethyl methacrylate (PMMA), polyethylene glycol terephthalate (PET), glass, metal, or other structural materials. Those skilled in the art can select the housing 30 made of different materials according to different requirements, so as to be suitable for the housing 30 in different application scenarios, which is not limited herein. For example, the PC substrate can make the housing 30 thinner and lighter, the glass fiber substrate has better toughness, the PMMA substrate is highly transparent and easy to process, the glass substrate has better transparency, the metal substrate has better appearance effect, and the like.

Among them, in order to make the housing 30 better exhibit the integral black effect, the housing 30 is preferably made of a black material, such as a black PC material, a black PET material, an ultra-black material, and the like. It should be noted that the ultra-black material is also called "invisible" material, and only reflects about 0.035% of light, so as to reach the degree that the naked eye can not distinguish at all, and the black material is just like a black hole. Such super black materials may also be referred to as Vantabalck (Vantablack) materials, "invisible" materials, and the like. It should be understood that the light reflectance of the normally black ink is approximately 0.4% to 1.2%, i.e., the light reflectance of the normally black ink is approximately 10 to 35 times the light reflectance of the ultra-black material.

It will be appreciated that the ability of the housing 30 to exhibit the effect of a black integral black level is important in relation to the light reflectivity of the surface of the housing 30. When the surface of the housing 30 has a high light reflectivity, the housing 30 may appear a certain grayish appearance, and cannot exhibit a blackness effect of integral black. For example, in a use scene of a general mobile phone shell, the black of the shell is usually made by coating black ink, and the reflectivity of the black ink is approximately 0.4% -1.2%, so that the shell can present a certain grayish appearance and cannot present a blackness effect of integral black.

Based on this, in an embodiment, the light reflectivity of the surface of the housing 30 is reduced by forming the microstructure on the surface of the housing 30, so that the housing 30 can exhibit the blackness effect of the integral black.

The housing 30 may generally include an integrally formed body portion 31 and a plurality of raised portions 32, and the body portion 31 may include a first surface 311 and a second surface 312 disposed opposite to each other. The first surface 311 may be a surface of the housing 30 facing away from the display screen 10 and exposed to the electronic device 100, that is, an appearance surface of the housing 30. The second surface 312 may be a surface of the casing 30 close to the display screen 10 and hidden in the electronic device 100, i.e. an inner side surface of the casing 30.

The plurality of protrusions 32 may be distributed on the first surface 311 of the main body 31 in an array, and the cross-sectional area of the protrusions 32 gradually decreases along the first surface 311 toward a direction away from the second surface 312, so as to reduce the reflectivity of the first surface 311. Specifically, the cross section of the protrusion 32 is a plane substantially parallel to the first surface 311.

In one embodiment, the boss 32 is generally pyramidal in configuration. The cone refers to a spatial solid figure including a cone, a pyramid and the like, and is defined by a plane formed by a round or other closed plane base and line segments connecting points on the boundary of the base to a common vertex.

Referring to fig. 6 in combination, fig. 6 is a schematic structural view of the protrusion 32 according to some embodiments of the present disclosure, the protrusion 32 may generally include a bottom surface 321 and a side surface 322 extending from an edge of the bottom surface 321 toward a direction away from the second surface 312 and converging to an apex, the bottom surface 321 being disposed substantially coplanar with the first surface 311. The bottom 321 may be circular, oval, triangular, rectangular, square, polygonal, etc. Of course, the bottom surface 321 may also have other irregular shapes.

Wherein, when the bottom 321 is substantially circular, the protrusion 32 may have a cone structure. When the bottom 321 is substantially square or rectangular, the protrusion 32 may have a quadrangular pyramid structure. Preferably, an orthogonal projection of the apex of the convex portion 32 on the bottom surface 321 is located at the center of the bottom surface 321.

In one embodiment, for example, the bottom 321 is square, and the length of the bottom 321 is 50-200 μm. For example, the bottom surface 321 may be 75 microns, 86 microns, 97 microns, 120 microns, 150 microns, etc. on a side. The distance between the apex of the projection 32 and the edge of the bottom 321, i.e., the waist length of the projection 32, is approximately 30-150 microns. For example, the waist length of the projections 32 may be 33 microns, 65 microns, 89 microns, 106 microns, 131 microns, and the like.

It is understood that, when the bottom surface 321 has other shapes, the side length range of the bottom surface 321 can be understood as the radial length of the bottom surface 321 on the first surface 311 along one direction. Wherein the radial length is to be understood as the maximum radial length of the bottom surface 321 on the first surface 311.

In an embodiment, the edges of the adjacent bottom surfaces 321 of two adjacent protrusions 32 close to each other may be disposed adjacently, i.e., in contact with each other, so that two adjacent protrusions 32 are in seamless contact with each other between the bottom surfaces 321 on the first surface 311. Of course, in other embodiments, the edges of the adjacent bottom surfaces 321 of two adjacent protrusions 32 may be disposed with a gap, so that two adjacent protrusions 32 are disposed with a certain distance between the bottom surfaces 321 on the first surface 311. When the edges of two adjacent bottom surfaces 321 are disposed with a gap, the distance between the edges of two adjacent bottom surfaces 321 is generally not more than 10 micrometers, for example, the distance between two adjacent bottom surfaces 321 may be 2 micrometers, 5 micrometers, 8 micrometers, and the like.

In one embodiment, the length of a perpendicular line segment from the apex of the protrusion 32 to the bottom surface 321, i.e., the height h of the protrusion 32, is approximately 50-200 microns. For example, the height h of the projections 32 may be 75 microns, 86 microns, 100 microns, 120 microns, 150 microns, and the like. It will be appreciated that the overall thickness H of the housing 30 is generally 0.5 mm to 1.5 mm, and that the height H of the protrusion 32 is too high to occupy a large overall thickness H of the housing 30, which may affect the overall structural strength of the housing 30 to some extent. Based on this, the height H of the protrusion 32 in the embodiment of the present application is approximately 10% to 20% of the overall thickness H of the housing 30, so as to ensure the overall structural strength of the housing 30.

It will be appreciated that the side surface 322 may be an inclined surface inclined with respect to the bottom surface 321, or alternatively, the side surface 322 may be an arc surface having a center of sphere on a side of the side surface 322 adjacent to the bottom surface 321.

For example, taking the side surface 322 as an inclined plane with respect to the bottom surface 321 as an example, the side surface 322 has an inclination angle α with respect to the bottom surface 321. Wherein the inclination angle α is generally greater than 30 ° and less than 90 °, and the inclination angle α is preferably not less than 45 ° and less than 90 °. In an embodiment, the tilt angle α may be 45 °, 55 °, 60 °, 65 °, 70 °, 75 °, 80 °, and so on.

It will be appreciated that the magnitude of the tilt angle α has a significant effect on reducing the light reflectivity of the surface of the housing 30. Referring to fig. 7 to 9, fig. 7 to 9 respectively illustrate the light reflection routes corresponding to different tilt angles α. In the present embodiment, the light reflection path is exemplarily described by taking the light directly incident on the housing 30 as an example, that is, the incident light F is incident on the side surface 322 along the direction substantially perpendicular to the first surface 311 as an example.

As shown in fig. 7, when the inclination angle α is 30 °, the incident light F can be reflected by the side surface 322 of one of the protruding portions 32, and the reflected light is substantially parallel to the side surface 322 of another protruding portion 32 adjacent to the side surface 322, that is, the incident light F is directly emitted after being reflected once by the side surface 322. Obviously, this is generally consistent with the cosmetic effect that can be achieved by general planar reflection. This is because the plane reflection is also a direct emission of the incident light after the primary reflection by the plane. Therefore, when the inclination angle α is 30 °, the range of the reflectance that can be reduced by the housing 30 is limited based on the above arrangement of the housing 30, compared to a general plane reflection scene.

It is understood that when the inclination angle α is 30 °, light incident to the side surface 322 at other angles may be partially reflected to the side surface 322 of another protruding portion 32 adjacent to the side surface 322, and the reflectivity of the surface of the casing 30 may be reduced to some extent compared to a general plane reflection scene.

As shown in fig. 8, when the inclination angle α is 45 °, the incident light F can be reflected by the side surface 322 of one of the protruding portions 32, and then the reflected light F is incident on the side surface 322 of another protruding portion 32 adjacent to the side surface 322, that is, the incident light F can be emitted after being reflected at least twice. Clearly, this is significantly better than the appearance effect that can be achieved by normal planar reflection. This is because the greater the number of times the light is reflected, the greater the reflection attenuation of the light is generally, and the reflectance can be reduced to some extent. Therefore, when the inclination angle α is 45 °, the housing 30 can effectively increase the reduction range of the reflectance based on the above arrangement of the housing 30, compared to the general plane reflection scene.

As shown in fig. 9, when the inclination angle α is 70 °, the incident light F can be reflected by the side surface 322 of one of the protruding portions 32, the reflected light F is incident on the side surface 322 of another protruding portion 32 adjacent to the side surface 322, and then can be reflected back to the side surface 322 again, i.e., the incident light F can be reflected three or more times and then exits. Clearly, this is significantly better than the appearance effect that can be achieved by normal planar reflection. This is because the greater the number of times the light is reflected, the greater the reflection attenuation of the light is generally, and the reflectance can be reduced to some extent. Therefore, when the inclination angle α is 70 °, the housing 30 can effectively increase the reduction range of the reflectance based on the above arrangement of the housing 30, compared to the general plane reflection scene.

It is understood that when the inclination angle α does not exceed 30 °, the incident light F is emitted after being reflected once through the side surface 322. When the inclination angle α is greater than 30 ° and less than 90 °, at least a portion of the incident light ray F may be reflected multiple times via the adjacent side surfaces 322. When the inclination angle α is greater than or equal to 45 ° and less than 90 °, the incident light ray F may be reflected multiple times via the adjacent side surfaces 322. It should be understood that the more times the incident light F is reflected, the greater the degree of attenuation of the light, the greater the reduction of the reflectivity, and the blacker visual effect is shown in the appearance.

In other words, the adjacent side surfaces 322 of two adjacent protrusions 32 have an included angle β, which is 180 ° -2 α. The smaller β is, the more the light is reflected between the two adjacent side surfaces 322, the greater the attenuation of the light is, the greater the reduction of the reflectivity is, and the blacker visual effect is shown in the appearance. It will be appreciated that reference is made to a for the range of β.

Further, the applicant tests the above structure through experiments, and finds that the shell 30 provided in the embodiment of the present application can greatly reduce the reflectivity of the surface of the shell 30. Specifically, taking the case 30 with the bottom 321 of the protrusion 32 having a side length of 86 microns, a waist length of 106.96um, and a height h of 100 microns as an example, the olympus reflectance meter is used for testing, and the test results are as follows:

referring to fig. 10, fig. 10 is a schematic view of a scatter plot of the surface reflectivity test result of the housing 30 according to some embodiments of the present disclosure. Referring to the above table and fig. 10, the reflectivity of the shell 30 of the embodiment of the present application is approximately 0.02-0.07% in the visible light range with the wavelength of 380-780 nm. Obviously, the reduction of reflectance is significant compared to the typical black ink of 0.4% to 1.2%. In the above range of wavelengths of light, the reflectance of the surface of the housing 30 tends to be substantially gradually reduced in the process of increasing the wavelength of the housing 30 having the above structure.

Referring to fig. 11, fig. 11 is a schematic structural diagram of the housing 30 according to another embodiment of the present disclosure, the housing 30 may further include a membrane 33, and the membrane 33 is attached to the second surface 312 of the housing 30.

The film 33 may be adhered to the second surface 312 by an optical Adhesive (OCA), a Pressure Sensitive Adhesive (PSA), an Ethylene-Vinyl Acetate copolymer (EVA), or other Adhesive.

In one embodiment, the membrane 33 may be a membrane with one or more of fire, scratch, fingerprint, etc. functions to improve the overall performance of the housing 30. Wherein the membrane 33 has a thickness of approximately 0.1-0.2 mm. For example, the membrane 33 may have a thickness of 0.15 mm.

Of course, in other embodiments, the film 33 may also be a film layer having a color pattern, a gradient color pattern, a texture pattern, or the like to enhance the appearance effect, so as to enhance the user experience.

The casing that this application embodiment improved is through adopting black material to make to at the bellying of housing face formation cross sectional area gradual change, with the reflectivity that reduces housing face, and then realize integrative black outward appearance effect, thereby make the casing show blacker visual effect in the outward appearance effect.

Referring to fig. 12, fig. 12 is a schematic flow chart illustrating a method for manufacturing a housing according to some embodiments of the present application, where the method can be used to manufacture the housing according to the above embodiments.

The manufacturing method can roughly comprise the following steps:

and S1201, providing a black material. The black material may be black PC material, black PET material, super black material, etc. described in the foregoing embodiments.

In the embodiments of the present application, the black material is exemplified by black PC particles. For example, the black PC particles can be Saeber PC-923A-BK, Lonicera PC black particles, etc. It should be understood that the black material is not limited to particle morphology, but may be other morphologies such as small bulk.

In an embodiment, the step of providing the black material further may further include: the black material is subjected to a drying treatment so that the water content of the black material does not exceed 0.02%. Among these, the drying conditions of the black PC particles are generally: drying at a drying temperature of 100 ℃ to 120 ℃ for 4 to 5 hours to reduce the water content of the black PC material.

It can be understood that, for different black materials, the drying conditions can be flexibly adjusted according to actual needs, and this is not specifically limited in the embodiments of the present application.

And S1202, melting the black material and injecting the melted black material into a mold to form the shell.

Specifically, the housing structure having the above-described embodiments may be directly formed by an integral molding process. In the embodiments of the present application, the case described above is formed integrally by an injection molding process. Of course, the housing may also be integrally formed by other processing technologies such as injection molding, which will not be described in detail in this embodiment.

Before that, a mold adapted to the shape of the housing needs to be provided for injection molding. Namely, before step S1202, the method may further include: providing a mould, and processing the mould to form a cavity with a plurality of matching parts. Referring to fig. 13, fig. 13 is a schematic partial structural view of a mold 50 according to some embodiments of the present disclosure, wherein the mold 50 is made of nickel-phosphorus alloy or other metal or alloy with higher hardness. The mold 50 is formed with a cavity 51, and the shape of the cavity 51 is adapted to the shape of the housing 30. Further, an inner wall of the cavity 51 is formed with a plurality of fitting portions 52, and the shape of the fitting portions 52 is adapted to the shape of the protrusion 32.

In one embodiment, the mating portion 52 may be formed by CNC machining. It will be appreciated that the CNC machining precision is generally not less than 10 microns, and therefore a certain gap may exist between two adjacent mating portions 52 during actual machining, and the gap is generally not more than 10 microns. In order to ensure the structural strength of the mold 50 and the cavity 51, the opening of the engaging portion 52 is not necessarily too small. That is, the opening of the engaging portion 52 is sized to fit the bottom 321 of the protrusion 32.

In one embodiment, taking a screw type injection machine as an example, the black PC material which is completely melted is stirred by a screw at a certain temperature, and then injected into the cavity 51 of the mold 50 at a high pressure, and after cooling and solidification, the housing 30 which is an integrally molded product is obtained.

Specifically, during the melting of the black PC material, the barrel temperature affects the plasticization and flow of the black PC material. Based on this, the barrel temperature is generally controlled in the range of 250 ℃ to 340 ℃ for black PC materials. In the research of the applicant, when the temperature of the cylinder exceeds 340 ℃ or even higher, the black PC material can be decomposed, the color of the product is darkened, and the defects of silver wires, dark stripes, black spots, bubbles and the like can appear on the surface of the product, and the physical and mechanical properties of the product can be obviously reduced with a great possibility. Of course, when the cylinder temperature is controlled within the range of 250 ℃ to 340 ℃, properly increasing the cylinder temperature has a certain positive effect on the plasticization of the black PC material.

The mold temperature has a significant impact on the intrinsic properties and apparent quality of the article. Based on this, the mold temperature is generally controlled in the range of 80 ℃ to 120 ℃, preferably 100 ℃ to 110 ℃ for black PC materials. It will be appreciated that the die temperature should not generally exceed the die heat distortion temperature, i.e. there is some variability in die temperature for dies made of different materials. In the research of the applicant, the proper increase of the mold temperature to reduce the difference between the mold temperature and the PC material temperature can effectively reduce the internal stress of the product. In the embodiment, the die made of nickel-phosphorus alloy is adopted, the temperature of the die is controlled within the range of 100-110 ℃, and the temperature of the charging barrel is controlled within the range of 250-320 ℃.

Further, during the process in which the screw stirs the molten black PC material and injects it into the mold through high pressure, the injection pressure, screw rotation speed, and back pressure directly affect the plasticization of the product and the product quality. The injection pressure is generally the pressure exerted by the top of the plunger or screw on the PC material, and the injection pressure can overcome the flow resistance of the PC material from the barrel to the cavity during the injection molding process, give the molten material a mold filling rate, and compact the molten material. When a screw injection machine is used, the pressure to which the melt at the top of the screw is subjected during the rotation and retraction of the screw is called the plasticizing pressure, also called the back pressure. The magnitude of the back pressure is adjustable by means of a relief valve in the hydraulic system. The amount of back pressure required during injection varies with the design of the screw, the quality requirements of the product and the type of PC material. If the above conditions and the screw rotation speed are kept constant, increasing the back pressure will enhance the shearing action, increase the temperature of the melt and reduce the efficiency of plasticization, and increase the reverse flow and leakage flow.

Based on this, in the present embodiment, the injection pressure is generally controlled between 80-120MPa, preferably 100-110MPa, so as to obtain a complete and smooth-surfaced product. Aiming at products with thin wall, long flow, complex shape and small sprue, in order to overcome the resistance of melt flow and fill the cavity in time, higher injection pressure such as 120-145MPa can be selected. Further, due to the high melt viscosity of the PC material, plasticization and outgassing are facilitated. In order to prevent the screw from being overloaded, the requirement on the rotating speed of the screw is not too high generally, namely the rotating speed of the screw is controlled to be 30-60r/min generally.

Further studies by the applicant have found that during injection of the article in its general form, the back pressure is generally controlled to be between 10-15% of the injection pressure. It will be appreciated that for less fluid article materials, high pressure injection is typically used. In addition, reasonable injection molding time can be selected in consideration of the cracking phenomenon which can occur due to the fact that large internal stress can be remained in the product. Generally speaking, the injection molding time is about 1/10-1/15 of the cooling time of the product. Within the above injection molding time ranges, longer injection molding times are generally selected for thicker articles and shorter injection molding times are generally selected for thinner articles. Clearly, a reasonable injection time contributes to a perfect filling of the melt and has a positive effect on improving the surface quality of the article and reducing dimensional tolerances.

Further, the black material is melted by the injection molding process and then injected into a cavity of a mold, and the shell with the convex part and the main body part can be obtained after cooling. Wherein, the thickness of the shell can be 0.5 mm-1.5 mm, and the height of the convex part can be 10% -20% of the thickness of the shell.

Referring to fig. 14, fig. 14 is a schematic flow chart illustrating a method for manufacturing a housing according to another embodiment of the present application, where the method can be used to manufacture the housing according to the above embodiment.

The manufacturing method can roughly comprise the following steps:

s1401, providing a black material, and the step can refer to step S1201, which is not described herein.

And S1402, melting the black material and injecting the black material into a mold to form the shell. The step S1402 refers to the step S1202, and is not described herein.

And S1403, providing a membrane, and attaching the membrane to the second surface of the shell body part.

The film may be adhered to the second surface by an optical Adhesive (OCA), a Pressure Sensitive Adhesive (PSA), an Ethylene-Vinyl Acetate copolymer (EVA), or other Adhesive.

The diaphragm can be a diaphragm with one or more of the functions of fire prevention, scratch prevention, fingerprint prevention and the like, so that the comprehensive performance of the shell is improved. In addition, the film can also be a film layer with color patterns, gradient color patterns, cultural patterns and the like to improve the appearance effect, so that the user experience is improved.

Of course, in some embodiments, for example, a light-transmitting hole corresponding to the optical device, a sound hole corresponding to the acoustic device, and the like may be further formed on the casing, which is not described in detail in this embodiment.

It should be noted that, for technical features not described in detail in the embodiments of the present application, reference may be made to the detailed description in the foregoing embodiments, and therefore, no further description is provided in this embodiment.

It is noted that the terms "comprises" and "comprising," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.

The above description is only a part of the embodiments of the present application, and not intended to limit the scope of the present application, and all equivalent devices or equivalent processes performed by the content of the present application and the attached drawings, or directly or indirectly applied to other related technical fields, are also included in the scope of the present application.

Claims

1. A housing, characterized in that the housing comprises:

a body portion including a first surface and a second surface disposed opposite to each other;

the plurality of convex parts are distributed on the first surface in an array manner;

wherein the cross-sectional area of the boss decreases gradually along the first surface toward a direction away from the second surface; the shell is made of black materials, and the cross section of the shell is a plane parallel to the first surface.

2. The housing of claim 1, wherein the raised portion includes a bottom surface and side surfaces extending from edges of the bottom surface in a direction away from the second surface and converging at an apex; the bottom surfaces are coplanar with the first surface, and the edges of two adjacent bottom surfaces close to each other are arranged in an abutting mode or a gap mode.

3. The housing of claim 2, wherein the boss is a cone or a pyramid; the orthographic projection of the vertex on the bottom surface is positioned in the center of the bottom surface.

4. The housing of claim 2, wherein the distance between the edges of two adjacent bottom surfaces adjacent to each other is not more than 10 μm.

5. The housing of claim 2, wherein the side surface has an oblique angle with respect to the bottom surface, the oblique angle being greater than 30 ° and less than 90 °.

6. The housing of claim 5, wherein a length of a perpendicular segment from the apex to the floor is between 50 microns and 200 microns.

7. The housing of claim 1, wherein the body portion and the boss portion are integrally formed.

8. The housing according to any one of claims 1 to 7, further comprising a membrane attached to the second surface.

9. A method of making a housing, the method comprising:

providing a black material;

melting the black material and injecting the melted black material into a mold to form the shell;

the shell comprises a main body part and a plurality of convex parts, wherein the main body part is provided with a first surface and a second surface which are oppositely arranged; the plurality of convex parts are distributed on the first surface in an array manner; the cross section area of the bulge part is gradually reduced from the first surface to the direction departing from the second surface, and the cross section is a plane parallel to the first surface.

10. The method of manufacturing according to claim 9, wherein the step of providing a black material comprises: the black material is subjected to a drying treatment so that the water content of the black material does not exceed 0.02%.

11. The method of claim 9, wherein the step of melting and injecting the black material into the mold further comprises:

providing the mould, and processing the mould to form a cavity with a plurality of matching parts; the shape of the cavity is matched with that of the shell, and the shape of the matching part is matched with that of the protruding part.

12. The method of claim 9, wherein the step of melting and injecting the black material into a mold to form the shell further comprises:

and providing a membrane, and attaching the membrane to the second surface.

13. An electronic device, characterized in that the electronic device comprises: a display screen, a middle frame, and the housing of any one of claims 1-8; the display screen is connected with one side of the middle frame, and the shell is connected with the other opposite side of the middle frame.