Middle frame, mold and electronic device

Abstract

The present application is used to provide a middle frame, a mold and an electronic device. The middle frame is applied to the electronic device and includes a frame and a middle plate. The frame is made of plastic material. A plurality of blind grooves are provided on the first surface of the frame. The first surface is a side surface of the frame close to the display screen of the electronic device. An identification layer is provided at the bottom of the blind groove. The identification layer is used to identify the position of the blind groove corresponding thereto under lighting conditions. The present application provides a plurality of blind grooves as marking points on a side surface of the frame made of plastic material close to the display screen of the electronic device, and an identification layer is provided at the bottom of the blind groove for marking, so as to realize effective identification of the marking points under lighting conditions, thereby meeting the assembly requirements of the display screen of the electronic device and ensuring the assembly yield of the display screen. Compared with the existing implementation method of metal marking points, it can avoid the problem that the metal is easily oxidized after CNC, resulting in failure or inaccurate identification of the marking points.

Description

Technical Field

[0001] The present application relates to the technical field related to electronic devices, and in particular to a middle frame, a mold and an electronic device. Background Art

[0002] With the continuous development of mobile terminal technology, the application of electronic devices such as smart phones and PDAs has become extremely common and has become an important part of people's work and life. When assembling electronic devices, the middle frame is usually installed first, and then the circuit board, battery, display screen, back cover and other components are installed on the middle frame. During the installation of the display screen, the marking points at the four corners of the middle frame are required to ensure the accuracy of the display screen assembly.

[0003] At present, in some embodiments, the electronic device adopts a metal middle frame, and four marking points are usually formed on the metal middle plate of the middle frame by computer numerical control machine tools (Computer Numerical Control, CNC). However, the metal is easily oxidized after CNC, resulting in failure of marking point recognition, affecting the assembly of the electronic device. In other embodiments, the electronic device adopts a middle frame structure of a plastic frame + metal (such as X alloy) middle plate, and four marking points are formed on the metal middle plate by CNC processing, and then a specific material (such as polycarbonate (Polycarbonate, PC), etc.) is injection molded around the metal middle plate to form a middle frame structure of a plastic frame + metal middle frame. Similarly, the metal is easily oxidized after CNC, resulting in failure of marking point recognition, affecting the assembly of the electronic device. In addition, the middle frame structure of the plastic frame + metal middle frame uses CNC processing marking points, and the CNC processing tolerance and injection molding tolerance will make the cumulative tolerance of the entire middle frame larger, resulting in a distance limit when grabbing the edge. Summary of the invention

[0004] Some embodiments of the present application provide a middle frame, a mold, and an electronic device. The present application is introduced from multiple aspects below, and the embodiments and beneficial effects of the following aspects can be referenced to each other.

[0005] In a first aspect, an embodiment of the present application provides a middle frame, which is applied to an electronic device, wherein the middle frame includes a frame and a middle plate, wherein the frame is made of a plastic material, and a first surface of the frame is provided with a plurality of blind grooves, wherein the first surface is a side surface of the frame close to a display screen of the electronic device, and an identification layer is provided at the bottom of the blind groove, and the identification layer is used to identify the position of the corresponding blind groove under lighting conditions.

[0006] According to the implementation mode of the present application, a plurality of blind grooves are provided as marking points on the surface of one side of the frame made of plastic material close to the display screen of the electronic device, and a marking layer is provided at the bottom of the blind groove for marking, so as to realize effective identification of the marking points under lighting conditions, thereby meeting the assembly requirements of the electronic device display screen and ensuring the assembly yield of the display screen. Compared with the existing implementation mode of metal marking points, it can avoid the problem that the metal is easily oxidized after CNC, resulting in the failure of marking point recognition or inaccurate recognition.

[0007] In some embodiments, the identification layer is a reflective layer, and the reflective layer and other areas of the first surface have different reflective coefficients, so that the reflective layer and other areas of the first surface have different brightness under the lighting conditions.

[0008] According to the implementation mode of the present application, by setting a reflective layer at the bottom of the blind groove, under lighting conditions, light and dark contrast is achieved through the reflective layer at the bottom of the blind groove and other areas of the frame surface, so that effective identification of the marking point can be achieved.

[0009] In some embodiments, the reflective layer is obtained by polishing the bottom surface of the blind groove; or, the reflective layer is obtained by coating the bottom surface of the blind groove with a reflective material having a different reflective coefficient from other areas of the first surface.

[0010] According to the implementation manner of the present application, the reflective layer is provided by polishing or by coating a reflective material, both of which can achieve high contrast under lighting, and the implementation method is simple and reliable.

[0011] In some embodiments, the other areas of the first surface are obtained by matte treatment.

[0012] According to the implementation mode of the present application, by performing matte treatment on other areas of the frame surface, the difference in reflective coefficient between the reflective layer and other areas of the frame surface can be further increased, thereby improving the light and dark contrast between the reflective layer and other areas of the frame surface under lighting conditions, thereby improving the subsequent recognition accuracy of the marking points.

[0013] In some embodiments, the identification layer is obtained by coating a material having a different color from other areas of the first surface on the bottom surface of the blind groove; or, the identification layer is obtained by setting identification information on the bottom surface of the blind groove.

[0014] According to the embodiment of the present application, by coating the bottom of the blind groove with a material of a different color from other areas of the frame surface, under lighting conditions, different color contrast is achieved between the bottom of the blind groove and other areas of the frame surface, and effective identification of the marking point can also be achieved. By setting identification information at the bottom of the blind groove, effective identification of the marking point can be achieved under lighting conditions through the identification information.

[0015] In some embodiments, the blind groove and the frame are obtained by integral injection molding.

[0016] According to the embodiment of the present application, by forming the blind groove and the frame by integral injection molding, the position tolerance of the marking point can be reduced, and the problem of distance exceeding the limit when grasping the edge can be avoided. In addition, by connecting the frame and the middle plate by integral injection molding, the connection reliability of the middle plate and the frame can be ensured.

[0017] In some embodiments, the number of the blind grooves is at least three, wherein at least one blind groove is disposed at each of the three corners of the frame.

[0018] In some embodiments, the number of the blind slots is three, which are respectively arranged at the upper left corner, the upper right corner, and the lower right corner of the frame.

[0019] In some embodiments, the number of the blind grooves is at least three, wherein at least one blind groove is provided at each of the two corners of the common first side of the frame, and at least one blind groove is provided at a non-corner position of the second side opposite to the first side.

[0020] According to an implementation manner of the present application, by setting at least one marking point at each of the three corners of the frame, or setting at least one marking point at each of the two corners of the common first side of the frame, and setting at least one marking point at a non-corner position of the second side opposite to the first side, accurate edge grasping positioning of the frame can be achieved through at least three marking points, which can meet the assembly requirements of the electronic device display screen and ensure that the assembly yield of the display screen is not lower than the edge grasping solution of setting four marking points at the four corners of the frame.

[0021] In a second aspect, an embodiment of the present application provides a mold for preparing a middle frame, the mold comprising:

[0022] Upper and lower dies;

[0023] The upper mold and the lower mold are combined to form a cavity, and the inner surface shape of the cavity is the same as the outer surface shape of the middle frame provided in the first aspect.

[0024] According to the implementation mode of the present application, by forming a mold for preparing the middle frame, the mold can be used for injection molding to obtain the corresponding middle frame, and the preparation process is simple. In addition, the middle frame prepared by the mold can be provided with multiple blind grooves as marking points on the surface of one side of the frame made of plastic material close to the display screen of the electronic device, and an identification layer is provided at the bottom of the blind groove for identification, so as to realize effective identification of the marking points under lighting conditions, thereby meeting the assembly requirements of the electronic device display screen and ensuring the assembly yield of the display screen. Compared with the existing implementation method of metal marking points, it can avoid the problem that the metal is easily oxidized after CNC, resulting in the failure of marking point recognition or inaccurate recognition.

[0025] In some embodiments, the area of ​​the inner surface of the cavity corresponding to the reflective layer of the frame is obtained by polishing, and the other areas of the inner surface of the cavity are obtained by matte treatment.

[0026] According to an embodiment of the present application, by polishing the area corresponding to the reflective layer of the frame on the mold and matte-finishing the other areas, when the mold is used for injection molding to obtain the middle frame, a bright surface can be formed at the position of the reflective layer of the frame, and a surface with lower gloss can be formed in other areas, which is conducive to simplifying the preparation process.

[0027] Other beneficial effects that can be achieved by the second aspect can refer to the beneficial effects of any implementation method of the first aspect of the present application, and will not be repeated here.

[0028] In a third aspect, an embodiment of the present application provides an electronic device, including the middle frame provided in the first aspect. The beneficial effects that can be achieved in the third aspect can refer to the beneficial effects of any embodiment of the first aspect of the present application, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic diagram of the three-dimensional structure of a mobile phone provided in one embodiment of the present application;

[0030] Figure 2 A schematic diagram of an exploded structure of a mobile phone provided in one embodiment of the present application;

[0031] Figure 3 A schematic diagram of the structure of a middle frame provided according to some embodiments;

[0032] Figure 4 A schematic diagram of the structure of a middle frame provided in one embodiment of the present application;

[0033] Figure 5 A partial cross-sectional view of a blind groove provided in one embodiment of the present application;

[0034] Figure 6A schematic diagram of the location of a blind slot provided in one embodiment of the present application;

[0035] Figure 7 A schematic diagram of the location of a blind groove provided in another embodiment of the present application;

[0036] Figure 8 A schematic diagram of a process for preparing a middle frame provided in accordance with an embodiment of the present application.

[0037] Description of reference numerals:

[0038] 100 - mobile phone; 10 - display screen; 20 - middle frame; 21 - middle plate; 211 - marking point; 22 - frame; 221 - blind groove; 2211 - identification layer; 2212 - other areas of the first surface; 23, 24 - dotted frame; 30 - circuit board; 40 - battery; 50 - back cover. DETAILED DESCRIPTION

[0039] The illustrative embodiments of the present application include but are not limited to a middle frame, a mold, and an electronic device. The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application.

[0040] The middle frame provided in the embodiment of the present application can be set in an electronic device, and the electronic device can include but is not limited to a mobile phone, a tablet computer, a laptop computer, an ultra-mobile personal computer (UMPC), a handheld computer, a walkie-talkie, a netbook, a POS machine, a personal digital assistant (PDA), a driving recorder, a wearable device, a virtual reality device, a wireless USB flash drive, a Bluetooth speaker / headphone, or a mobile or fixed terminal with a frame or a shell such as a vehicle-mounted terminal. The embodiment of the present application does not impose any special restrictions on the specific form of the above-mentioned electronic device. For the sake of ease of understanding, the following description takes the electronic device as an example of a mobile phone.

[0041] Reference Manual Attached Figure 1 and Figure 2 , Figure 1 A schematic diagram of the three-dimensional structure of a mobile phone 100 provided in one embodiment of the present application is shown in FIG. Figure 2 For Figure 1 The exploded view of the mobile phone 100 is shown. Figure 2As shown, the mobile phone 100 may include: a display screen 10 and a back cover 50, and components such as a middle frame 20, a circuit board 30 and a battery 40 may be disposed between the display screen 10 and the back cover 50. The components such as the circuit board 30 and the battery 40 may be disposed on the middle frame 20, for example, the circuit board 30 and the battery 40 may be disposed on a side of the middle frame 20 facing the back cover 50; or the circuit board 30 and the battery 40 may be disposed on a side of the middle frame 20 facing the display screen 10.

[0042] When the circuit board 30 is disposed on the middle frame 20, an opening (such as Figure 2 As shown in the dotted frame 23 in the figure, in this way, the components on the circuit board 30 can be placed in the opening of the middle frame 20.

[0043] When the battery 40 is disposed on the middle frame 20, for example, a battery compartment may be disposed on a side of the back cover 50 facing the middle frame 20, and the battery 40 may be installed in the battery compartment (eg, Figure 2 In the embodiment of the present application, the battery 40 can be connected to the charging management module and the circuit board 30 through the power management module. The power management module receives the input of the battery 40 and / or the charging management module, and supplies power to the processor, internal memory, external memory, display screen 10, camera, and communication module. The power management module can also be used to monitor parameters such as the capacity of the battery 40, the number of cycles of the battery 40, and the health status (leakage, impedance) of the battery 40. In some other embodiments, the power management module can also be set in the processor of the circuit board 30. In other embodiments, the power management module and the charging management module can also be set in the same device.

[0044] The display screen 10 may be an organic light-emitting diode (OLED) display screen or a liquid crystal display (LCD). It should be understood that the display screen 10 may include a display and a touch control device, the display is used to output display content to the user, and the touch control device is used to receive touch events input by the user on the display screen 10.

[0045] The display screen 10 may be a flexible display screen or a hard display screen, wherein the flexible display screen has a foldable function and can cooperate with the structural design of the back cover 50 to realize operations such as folding of the mobile phone 100. The display screen 10 may be an ordinary regular screen or a special-shaped screen, for example, the outer edge of the display screen 10 may be set to an arc shape to form a curved screen.

[0046] The display screen 10 can be arranged on the front side of the mobile phone 100, or on the back side of the mobile phone 100, or on both the front side and the back side of the mobile phone 100. The front side of the mobile phone 100 can be understood as the side facing the user when the user uses the mobile phone 100, and the back side of the mobile phone 100 can be understood as the side facing away from the user when the user uses the mobile phone 100.

[0047] The back cover 50 may be a metal back cover, a glass back cover, a plastic back cover, or a ceramic back cover. In the embodiment of the present application, the material of the back cover 50 is not limited.

[0048] In some embodiments, Figure 2 As shown, the middle frame 20 may include a metal middle plate 21 and a frame 22. The frame 22 is arranged along the periphery of the metal middle plate 21. For example, the frame 22 may be around the periphery of the metal middle plate 21, or it may be an unclosed surrounding. The frame 22 may include a top edge and a bottom edge that are relatively arranged, and a left side and a right side that are relatively arranged between the top edge and the bottom edge. Among them, the connection method between the frame 22 and the metal middle plate 21 includes but is not limited to welding, clamping and integral injection molding. Among them, the material of the metal middle plate 21 may be aluminum or aluminum alloy, or the material of the metal middle plate 21 may be stainless steel. The frame 22 may be a metal frame, a glass frame, a plastic frame or a ceramic frame. It should be noted that the materials of the metal middle plate 21 and the frame 22 include but are not limited to the above materials.

[0049] It is to be understood that the structure illustrated in the embodiment of the present application does not constitute a specific limitation on the mobile phone 100. In other embodiments of the present application, the mobile phone 100 may include more or fewer components than those shown in the figure, or combine some components, or separate some components, or arrange the components differently. For example, the mobile phone 100 may also include devices such as a camera (such as a front camera and a rear camera) and a flash.

[0050] In actual applications, when assembling the mobile phone 100, the middle frame 20 is usually set first, and then the circuit board 30, the battery 40, the display screen 10, the back cover 50 and other components are installed on the middle frame 20. In the process of installing the display screen 10, the marking points on the middle frame 20 are required to ensure the assembly accuracy of the display screen 10.

[0051] In conjunction with the reference manual Figure 3 , which shows a schematic diagram of a middle frame 20 provided according to some embodiments. Figure 3 As shown, four marking points 211 can be formed on the four corners of the metal middle plate 21 of the middle frame 20 by CNC processing. The shape of the marking point 211 can be Figure 3The circle shown in the figure may also be other shapes, such as a triangle, a quadrilateral, a hexagon or other polygon, an equilateral polygon or an unequal-sided strip-shaped polygon, etc., and the embodiment of the present application does not impose any specific restrictions on this. The material of the metal middle plate 21 may be aluminum or an aluminum alloy, or the material of the metal middle plate 21 may be a stainless steel material, and the embodiment of the present application does not impose any specific restrictions on this.

[0052] In the process of assembling the display screen 10, the charge-coupled device (CCD) device can first identify the marking points 211 on the four corners of the metal middle plate 21, and determine the center point coordinates of each marking point 211 (recorded as the marking point coordinates). Then, the distance data between each marking point coordinate and the two adjacent sides on the frame 22 can be captured, and then each marking point coordinate can be converted into the manipulator coordinate system. Finally, according to the captured distance data and the coordinates of each marking point in the manipulator coordinate system, the position of the frame 22 in the manipulator coordinate system can be determined, so that the display screen 10 can be correctly installed in the display screen compartment.

[0053] Among them, the manipulator coordinate system refers to a coordinate system built in the direction of the manipulator's three-dimensional space movement. The existing coordinate conversion method can be used to convert the coordinates of the four marking points into the manipulator coordinate system, and the embodiments of this application will not be repeated here. In addition, various types of existing image recognition methods can be used to identify the marking point 211 and determine the center point coordinates of the marking point 211, and the embodiments of this application will not be repeated here.

[0054] However, since metal is easily oxidized after CNC, it will cause the recognition of the marking points to fail, affecting the assembly of the mobile phone. In addition, the CNC machining marking points of the middle frame structure of the plastic frame + metal middle plate are processed. The CNC machining tolerance and injection molding tolerance will make the cumulative tolerance of the entire middle frame larger, resulting in the distance exceeding the limit when grabbing the edge.

[0055] In order to solve the above problems, the embodiments of the present application provide a middle frame, a mold and an electronic device, by opening a plurality of blind grooves as marking points on the surface of one side of the frame made of plastic material close to the display screen of the electronic device, and setting an identification layer at the bottom of the blind groove for identification, so as to achieve effective identification of the marking points under lighting conditions, thereby meeting the assembly requirements of the electronic device display screen and ensuring the assembly yield of the display screen. Compared with the existing implementation method of metal marking points, it can avoid the problem that metal is easily oxidized after CNC, resulting in failure or inaccurate identification of marking points.

[0056] According to one embodiment of the present application, a reflective layer is provided at the bottom of the blind groove, and under lighting conditions, light and dark contrast is achieved between the reflective layer at the bottom of the blind groove and other areas of the frame surface, thereby enabling effective identification of the marking point.

[0057] According to one embodiment of the present application, by coating the bottom of the blind groove with a material having a different color from other areas of the frame surface, under lighting conditions, different color contrast is achieved between the bottom of the blind groove and other areas of the frame surface, and effective identification of the marking point can also be achieved. By setting identification information at the bottom of the blind groove, effective identification of the marking point can be achieved under lighting conditions through the identification information.

[0058] According to one embodiment of the present application, by setting three marking points at the upper left corner, upper right corner and lower right corner of the frame, accurate edge grabbing can be achieved through the three marking points, which can meet the assembly requirements of the electronic device display screen and ensure that the assembly yield of the display screen is not lower than the edge grabbing solution with four marking points.

[0059] The structure of the middle frame provided in the embodiments of the present application is introduced below in conjunction with specific embodiments.

[0060] In conjunction with the reference manual Figure 4 , which shows a schematic diagram of a middle frame provided by an embodiment of the present application. Figure 4 As shown, the middle frame 20 may include a middle plate 21 and a frame 22. The middle plate 21 is made of a metal material, and the type of the metal material is not limited here. During specific implementation, those skilled in the art may select it according to actual needs. For example, the material of the middle plate 21 may be an aluminum alloy, stainless steel, etc. The frame 22 is made of a plastic material, and the type of the plastic material is not limited here. During specific implementation, those skilled in the art may select it according to actual needs. For example, the material of the frame 22 may be one or more of PC, acrylonitrile-butadiene-styrene copolymer (ABS), a combination of PC and ABS, polyphthalamide (PPA), polyamide (PA), polybutylene terephthalate (PBT), polyphenylene sulfide (PPS), polyether ether ketone (PEEK), a combination of PPA and PA, and the like.

[0061] It should be clear that when the plastic material is a combination of multiple materials, for example, a combination of PPA and PA, the ratio between PPA and PA is not limited. Regardless of the ratio between the two, the plastic material is a mixture of two existing materials, PPA and PA, and should not be understood as a new material. In fact, the type of plastic material selected is related to the specific processing steps of the frame 22. In the preparation process of the frame 22, it is usually necessary to grind, polish and perform other physical and chemical treatment processes on the frame 22 so that the frame 22 can obtain the corresponding appearance effect. In the case of different processing steps, different plastic materials can be selected to make the frame 22.

[0062] In some embodiments, additives may be added to the plastic material, such as glass fiber, an additive for reducing cooling deformation. Compared with metal materials, plastic materials have relatively poor modeling capabilities and are easily deformed during the cooling and curing process. In order to ensure a better appearance of the frame, in the embodiment of the present application, additives may be added to the plastic material of the injection molding frame 22 to reduce the deformation of the plastic material during condensation and curing, and to improve the strength of the frame, so as to improve the surface quality of the frame after condensation and curing, thereby ensuring a better appearance.

[0063] It is understandable that the greater the amount of additive added, the smaller the cooling deformation of the frame formed, and the less the amount of additive added, the smaller the effect of the additive on the fluidity of the plastic material, and the more conducive to the injection molding of the frame. In this way, when selecting and setting the amount of additive added, it is actually necessary to comprehensively consider the cooling deformation ability and fluidity of the plastic material. In specific implementation, the weight ratio of the additive to the plastic material can be set to less than 65%, that is, the cooling deformation ability and fluidity of the plastic material can be better taken into account.

[0064] In some embodiments, the middle plate 21 can be partially set as a plastic plate portion. In this case, the middle plate 21 can include a metal plate portion and a plastic plate portion. The embodiment of the present application does not limit the setting position of the plastic plate portion on the middle plate 21. During specific implementation, those skilled in the art can set it according to actual needs. For example, the area of ​​the middle plate 21 that needs to be shaped (such as the area where the battery compartment is provided, etc.) can still be made of metal material to facilitate the shaping process. The other areas of the middle plate 21 use plastic plate portions to achieve the technical purpose of weight reduction. When a part of the middle plate 21 is a plastic plate portion, there can be only one area on the middle plate 21 set as a plastic plate portion, or there can be multiple areas set as plastic plate portions. Both methods are options that can be adopted during specific implementation.

[0065] It can be understood that by setting at least a part of the middle plate as a plastic plate portion, the weight of the middle plate can be greatly reduced, and then the weight of the middle frame can be reduced to better meet the lightweight design requirements of the device.

[0066] In some embodiments, the frame 22 may also be partially set as a metal frame portion, in which case the frame 22 may include a metal frame portion and a plastic frame portion. When a portion of the frame 22 is a metal frame portion, there may be only one area on the frame 22 set as a metal frame portion, or there may be multiple areas set as metal frames. Both methods are options that can be adopted in specific implementation. When a portion of the frame 22 is a metal frame portion, the blind groove 221 on the frame 22 may be set in the area of ​​the plastic frame portion.

[0067] It can be understood that by setting at least a part of the frame as a metal frame, the strength of the frame can be improved and the diverse demands for appearance can be met.

[0068] It should be noted that in actual applications, it is preferred to set the middle plate 21 entirely as a metal plate portion and the frame 22 entirely as a plastic frame portion. In this way, the processing and forming of the middle plate 21 and the frame 22 and the connection of the middle plate 21 and the frame 22 can be relatively simple, which is conducive to simplifying the preparation process.

[0069] like Figure 4 As shown, the frame 22 can be arranged around the middle plate 21, and the frame 22 can form a closed ring. The middle plate 21 is located on the inner side of the frame 22. The middle plate 21 can be connected to the frame 22 in the thickness direction of the mobile phone 100 (such as Figure 4 The middle plate 21 and the frame 22 are connected in the direction indicated by the dotted line in the lower left corner coordinate system, and the thickness direction is perpendicular to the width direction and the length direction). The connection position of the middle plate 21 and the frame 22 is not limited here. During the specific implementation, those skilled in the art can determine it according to the actual design requirements. For example, the middle plate 21 and the frame 22 can be connected at the four corners of the middle plate 21, or can be connected at part or all of the edges of the middle plate 21.

[0070] In addition, the embodiment of the present application does not limit the connection method of the middle plate 21 and the frame 22. The middle plate 21 and the frame 22 can be an integrated structure, or the middle plate 21 can also be an independently arranged component, and then, it can be connected to the frame 22 by a mechanical connection method such as welding or bonding.

[0071] For example, in a specific implementation, the required mold can be configured first, and the specific structural form of the mold can be determined in combination with actual needs; then, the middle plate 21 can be made of metal material first, and the prepared middle plate 21 can be placed in the mold; then, the plastic material used to form the frame 22 can be heated to a molten state, and the molten plastic material can be injected into the mold cavity of the mold; after the plastic material is condensed and solidified, a frame 22 arranged around the middle plate 21 can be formed, thereby obtaining an integrated structure of the middle plate 21 and the frame 22. At this time, the middle plate 21 and the frame 22 can have a good bonding effect. Specifically, the thickness of the frame 22 formed by direct injection molding is not limited here. In a specific implementation, those skilled in the art can determine it according to the size requirements of the mobile phone 100.

[0072] It can be understood that by connecting the frame and the middle plate by integral injection molding, the connection reliability between the middle plate and the frame can be ensured.

[0073] like Figure 4 As shown, the first surface of the frame 22 is provided with a plurality of blind grooves 221 as marking points. The first surface of the frame 22 is the side surface that will be close to the display screen 10 of the mobile phone 100 after the mobile phone 100 is assembled. During the assembly process, the mounting device facing the display screen 10 is the target surface, i.e., the first surface, on which the display screen 10 will be mounted.

[0074] In the embodiment of the present application, the blind groove 221 can be a groove body with an open top, the top of the blind groove 221 refers to the side close to the display screen 10 of the mobile phone 100, and the bottom of the blind groove 221 refers to the side away from the display screen 10 of the mobile phone 100 and close to the middle plate 21. The depth of the blind groove 221 can be less than the thickness of the frame 22 at other positions in the area where the blind groove 221 is located. The shape of the blind groove 221 can be Figure 4 The circle shown in the figure may also be other shapes, such as polygons such as triangles, quadrilaterals, hexagons, equilateral polygons or unequal-sided strip-shaped polygons, etc. The embodiment of the present application does not impose specific restrictions on this. The size and depth of the blind groove 221 are not limited here either. During the specific implementation, those skilled in the art can select according to actual needs. As an example, according to the embodiment of the present application, a circular blind groove with a diameter of 1.6mm-2.4mm and a depth of 0.5mm-1mm can be set.

[0075] In addition, the embodiment of the present application also allows for multiple ways of forming the blind groove 221. The blind groove 221 and the frame 22 can be obtained by integral injection molding, or a groove can be made in a corresponding area on the first surface of the frame 22 to form the blind groove 221 on the frame 22.

[0076] In conjunction with the reference manual Figure 5, which shows a partial cross-sectional view of a blind groove of a middle frame provided by an embodiment of the present application. Figure 5 As shown, a marking layer 2211 is provided at the bottom of the blind groove 221 , and the marking layer 2211 can be used to mark the position of the corresponding blind groove 221 under lighting conditions.

[0077] Specifically, the shape of the identification layer 2211 may be the same as or different from the shape of the blind groove 221. That is, the shape of the identification layer 2211 may be circular or other shapes, such as a triangle, quadrilateral, hexagonal polygon, an equilateral polygon or an unequally shaped strip polygon, etc., and the embodiment of the present application does not impose any specific restrictions on this. The size of the identification layer 2211 may be less than or equal to the size of the bottom surface of the blind groove 221, and preferably, the size of the identification layer 2211 may be equal to the size of the bottom surface of the blind groove 221, and the embodiment of the present application does not impose any specific restrictions on this.

[0078] It can be understood that by setting the identification layer 2211 smaller than the bottom surface size of the blind groove 221, it is possible to save processing time, improve the preparation efficiency of the entire middle frame, and facilitate processing. By setting the identification layer 2211 equal to the bottom surface size of the blind groove 221, it is more conducive to the subsequent accurate identification of the blind groove 221 based on the identification layer 2211, thereby ensuring the success rate of identification.

[0079] It should be noted that, when the size of the identification layer 2211 is smaller than the size of the bottom surface of the blind groove 221 , it is preferred that the center point position of the identification layer 2211 coincides with the center point position of the blind groove 221 .

[0080] It can be understood that by opening a plurality of blind grooves as marking points on the surface of one side of the frame made of plastic material close to the display screen of the mobile phone, and setting a marking layer at the bottom of the blind groove for marking, the marking points can be effectively identified under lighting conditions, thereby meeting the assembly requirements of the mobile phone display screen and ensuring the assembly yield of the display screen. Compared with the existing implementation method of metal marking points, the use of blind grooves formed by plastic materials as marking points can avoid the problem of easy oxidation of metal after CNC, resulting in failure or inaccurate recognition of marking points.

[0081] The purpose of setting the identification layer 2211 is to enable the blind groove 221 to be well identified under the above-mentioned lighting conditions, so as to accurately obtain information such as the coordinates of the center point of the blind groove 221. The lighting condition can be the edge recognition light of various CCD devices, which can be visible light or invisible light such as infrared light, which is not limited in the embodiment of the present application. In specific implementation, the lighting condition can preferably be set to visible white light.

[0082] In some embodiments, the identification layer 2211 may be a reflective layer, and the reflective layer and other areas 2212 of the first surface of the frame 22 have different reflective coefficients under the above-mentioned lighting conditions, so that the reflective layer and other areas 2212 of the first surface of the frame 22 have different brightness under lighting conditions. The reflective coefficient refers to the ratio of the intensity of the reflected light reflected by the surface of an object to the intensity of the incident light when the incident light irradiates the object, and the reflective coefficient can be used to identify the reflective ability of the object. Under the same lighting conditions, the intensity of light reflected by an object with a larger reflective coefficient is higher, and the brightness of the object is higher, and the intensity of light reflected by an object with a smaller reflective coefficient is lower, and the brightness of the object is lower.

[0083] It can be understood that by providing a reflective layer at the bottom of the blind groove, under lighting conditions, light and dark contrast is achieved through the reflective layer at the bottom of the blind groove and other areas of the frame surface, so that effective identification of the marking point can be achieved.

[0084] In some embodiments, the reflective layer can be processed so that the reflective coefficient is greater than the reflective coefficient of other areas 2212 of the first surface of the frame 22, so that the brightness of the reflective layer is higher than the brightness of other areas 2212 of the first surface of the frame 22 under lighting conditions.

[0085] Optionally, the reflective layer can be obtained by polishing the bottom surface of the blind groove 221. Polishing is a process of modifying the surface of the workpiece using a flexible polishing tool and abrasive particles or other polishing media to obtain a smooth surface or a mirror-like gloss.

[0086] Specifically, since the material of the frame 22 in the embodiment of the present application is plastic material, preferably, the reflection coefficient of the bottom surface of the blind groove 221 can be improved by polishing, so that the bottom surface of the blind groove 221 forms a reflective layer with a reflection coefficient greater than that of other areas 2212 of the first surface of the frame 22.

[0087] It should be noted that the bottom surface of the blind groove 221 can be polished by an existing polishing method to obtain a reflective layer. For example, a high-speed rotating polishing wheel can be pressed against the bottom surface of the blind groove 221 so that the micro-powder abrasive coated on the rim of the polishing wheel rolls and slightly cuts the bottom surface of the blind groove 221, thereby obtaining a bright reflective layer. The embodiments of the present application will not be described in detail here.

[0088] It should be noted that, in some embodiments, when generating a mold for preparing the middle frame 20, a high-speed rotating polishing wheel can be used to press against the area on the inner surface of the mold corresponding to the reflective layer of the frame 22, so that the micro-powder abrasive coated on the rim of the polishing wheel rolls and slightly cuts the area, thereby obtaining a bright processed surface, so that when the middle frame 20 is obtained by injection molding using the mold, a bright reflective layer can be formed.

[0089] It can be understood that the provision of the reflective layer through polishing can achieve high contrast under lighting conditions, and the implementation method is simple and reliable.

[0090] In some embodiments, while polishing the bottom surface of the blind groove 221 to increase the reflection coefficient, the other areas 2212 of the first surface of the frame 22 can also be matte treated to reduce the reflection coefficient of the other areas 2212 of the first surface of the frame 22, thereby increasing the difference in reflection coefficient between the reflective layer and the other areas 2212 of the first surface of the frame 22, and increasing the brightness difference between the reflective layer and the other areas 2212 of the first surface of the frame 22 under lighting conditions, thereby improving the subsequent recognition accuracy of the blind groove 221.

[0091] It can be understood that by performing matte treatment on other areas of the frame surface, the difference in reflective coefficient between the reflective layer and other areas of the frame surface can be further increased, thereby improving the light and dark contrast between the reflective layer and other areas of the frame surface under lighting conditions, thereby improving the subsequent recognition accuracy of the marking points.

[0092] In some embodiments, only the other areas 2212 of the first surface of the frame 22 may be matte treated to reduce the reflection coefficient of the other areas 2212 of the first surface of the frame 22, so that the bottom surface of the blind groove 221 forms a reflective layer with a reflection coefficient greater than that of the other areas 2212 of the first surface of the frame 22.

[0093] It should be noted that the other areas 2212 of the first surface of the frame 22 can be matte treated by an existing matte treatment method, which will not be described in detail in the embodiments of the present application. In some embodiments, when generating a mold for preparing the middle frame 20, the inner surface of the mold corresponding to the other areas 2212 of the first surface of the frame 22 can be matte treated to obtain a processed surface with lower glossiness, so that when the middle frame 20 is obtained by injection molding using the mold, a surface with lower glossiness can be formed.

[0094] In addition, in some alternative embodiments, the reflective coefficient of the reflective layer can be smaller than the reflective coefficient of other areas 2212 of the first surface of the frame 22, so that the brightness of the reflective layer is lower than the brightness of other areas 2212 of the first surface of the frame 22 under lighting conditions.

[0095] Optionally, the reflective layer can be obtained by matte-finishing the bottom surface of the blind groove 221. Matte-finishing can reduce the reflective coefficient of the bottom surface of the blind groove 221, so that the bottom surface of the blind groove 221 forms a reflective layer with a reflective coefficient smaller than that of other areas 2212 of the first surface of the frame 22.

[0096] It should be noted that the bottom surface of the blind groove 221 can be matte treated by an existing matte treatment method to obtain a reflective layer, which will not be described in detail in the embodiments of the present application. In some embodiments, when generating a mold for preparing the middle frame 20, the inner surface of the mold corresponding to the reflective layer of the frame 22 can be matte treated to obtain a processed surface with lower glossiness, so that when the middle frame 20 is obtained by injection molding using the mold, a reflective layer with lower glossiness can be formed.

[0097] It can be understood that the provision of a reflective layer through matte treatment can also achieve high contrast under lighting conditions, and the implementation method is simple and reliable.

[0098] In some embodiments, while the bottom surface of the blind groove 221 is matte-treated to reduce the reflection coefficient, the other areas 2212 of the first surface of the frame 22 can also be polished to increase the reflection coefficient of the other areas 2212 of the first surface of the frame 22, thereby increasing the difference in reflection coefficient between the reflective layer and the other areas 2212 of the first surface of the frame 22, and increasing the brightness difference between the reflective layer and the other areas 2212 of the first surface of the frame 22 under lighting conditions, thereby improving the subsequent recognition accuracy of the blind groove 221.

[0099] It can be understood that by polishing other areas of the frame surface, the difference in reflective coefficient between the reflective layer and other areas of the frame surface can be further increased, thereby improving the light and dark contrast between the reflective layer and other areas of the frame surface under lighting conditions, thereby improving the subsequent recognition accuracy of the marking points.

[0100] In some embodiments, only the other areas 2212 of the first surface of the frame 22 may be polished to increase the reflection coefficient of the other areas 2212 of the first surface of the frame 22, so that the bottom surface of the blind groove 221 forms a reflective layer with a reflection coefficient smaller than that of the other areas 2212 of the first surface of the frame 22.

[0101] It should be noted that the other regions 2212 of the first surface of the frame 22 can be polished by an existing polishing method, which will not be described in detail in the present embodiment. In some embodiments, when generating a mold for preparing the middle frame 20, the inner surface of the mold corresponding to the other regions 2212 of the first surface of the frame 22 can be polished to obtain a bright processed surface, so that when the middle frame 20 is obtained by injection molding using the mold, a bright surface can be formed.

[0102] In addition, in some alternative embodiments, the reflective layer can be obtained by coating the bottom surface of the blind groove 221 with a reflective material having a different reflective coefficient from other areas 2212 of the first surface of the frame 22 .

[0103] Specifically, the type of reflective material is not limited here. In the specific implementation, those skilled in the art can choose according to actual needs, and only need to make the coated reflective material have a different reflective coefficient from the material of other areas 2212 of the first surface of the frame 22. In other words, the reflective coefficient of the reflective material coated on the bottom surface of the blind groove 221 can be greater than the reflective coefficient of other areas 2212 of the first surface of the frame 22, or less than the reflective coefficient of other areas 2212 of the first surface of the frame 22, and the embodiment of the present application is not limited here. For example, when the frame 22 is made of PC material, a reflective layer of ABS material can be coated on the bottom surface of the blind groove 221; or, when the frame 22 is made of ABS material, a reflective layer of PC material can be coated on the bottom surface of the blind groove 221; or, a reflective layer of metal material can be coated on the bottom surface of the blind groove 221, and so on. The coating thickness of the reflective layer is not limited here either. In the specific implementation, those skilled in the art can choose according to actual needs. For example, it can be set to 20μm-50μm, and so on.

[0104] It can be understood that the provision of a reflective layer by coating a reflective material can also achieve high contrast under lighting conditions, and the implementation method is simple and reliable.

[0105] In addition, in some alternative embodiments, the identification layer 2211 may be obtained by coating the bottom surface of the blind groove 221 with a material having a different color from the other areas 2212 of the first surface of the frame 22 .

[0106] Specifically, the type of coating material is not limited here. During specific implementation, those skilled in the art can select it according to actual needs, and only need to make the coating material different from the material of the other areas 2212 of the first surface of the frame 22. For example, when the frame 22 is white, the bottom surface of the blind groove 221 can be coated with black, red or blue materials, etc. The coating thickness of the material is not limited here either. During specific implementation, those skilled in the art can select it according to actual needs. For example, it can be set to 20μm-50μm, etc.

[0107] It can be understood that by coating the bottom of the blind groove with a material of a different color from other areas of the frame surface, different color contrast can be achieved between the bottom of the blind groove and other areas of the frame surface under visible light conditions, thereby effectively identifying the marking points.

[0108] In some embodiments, the identification layer 2211 may be obtained by setting identification information on the bottom surface of the blind groove 221 .

[0109] Specifically, the identification information can be used to uniquely identify the blind slot corresponding thereto. The type of identification information is not limited here, and those skilled in the art can select it according to actual needs during specific implementation. For example, identification information carrying the words "marking point" or "blind slot" can be set on the bottom surface of the blind slot 221, and so on.

[0110] It can be understood that by setting identification information at the bottom of the blind groove, effective identification of the marking point can also be achieved through the identification information under lighting conditions.

[0111] In practical applications, after forming the blind groove 221 on the frame 22, the bottom surface of the blind groove 221 can be polished to obtain the identification layer 2211, or the bottom surface of the blind groove 221 can be coated with a reflective material having a different reflective coefficient from other areas 2212 of the first surface of the frame 22 to obtain the identification layer 2211, or coated with a material having a different color from other areas 2212 of the first surface of the frame 22 to obtain the identification layer 2211, or identification information can be set on the bottom surface of the blind groove 221 to obtain the identification layer 2211, and the final middle frame structure can be obtained. It should be noted that the setting of the identification layer 2211 can also be achieved by a combination of the above-mentioned methods, for example, by a combination of reflective material and identification information, or by a combination of color and reflective material, etc., and the embodiments of the present application are not limited to this.

[0112] like Figure 3 In the scene shown, a blind groove 221 can be respectively provided at the four corners of the frame 22. In some alternative embodiments, the blind grooves 221 may not be provided at the four corners of the frame 22, but may be provided at the center of the top, bottom, left and right sides of the frame 22, or a larger number of blind grooves 221 may be provided on the surface of the frame 22, and so on.

[0113] In some embodiments, due to the possible architectural space problem in actual application, it is impossible to set blind grooves at the four corners of the middle frame. According to the implementation of the present application, at least one blind groove can be set at only three positions of the middle frame, such as three corners.

[0114] In some embodiments, Figure 4 As shown, the number of the blind slots 221 can be three, which are respectively arranged at the upper left corner, the upper right corner and the lower right corner of the frame 22. Figure 4In the scenario shown, due to architectural space issues, a blind groove 221 (i.e., a marking point) cannot be set at the lower left corner of the frame 22. Therefore, blind grooves 221 can be set only at the upper left corner, upper right corner, and lower right corner of the frame 22. By adjusting the edge grabbing program, the three blind grooves 221 can be used to accurately grasp the edge positioning of the frame 22, thereby realizing the assembly of the display screen 10, ensuring that the assembly yield of the display screen 10 is not lower than that of the implementation method using four marking points.

[0115] It should be noted that the above-mentioned embodiment of setting the blind grooves 221 at the upper left corner, upper right corner and lower right corner of the frame 22 is only an example, and the number of blind grooves 221 set on the frame 22 is at least three, wherein at least one blind groove 221 is set at each of the three corners of the frame 22. For example, one blind groove 221 may be set at the upper left corner, the upper right corner and the lower right corner, or two blind grooves 221 may be set at each corner. For example, although Figure 4 Only one blind slot 221 is provided at the upper left corner, and two adjacent blind slots 221 may also be provided at the upper left corner. The position and number of the blind slots 221 are not limited here, and in specific implementation, those skilled in the art may select according to actual needs.

[0116] In some embodiments, at least one blind groove 221 may be provided at each of the two corners of the common first side of the frame 22, and at least one blind groove 221 may be provided at a non-corner position of the second side opposite to the first side. Figure 4 The arrangement shown is adjusted so that Figure 4 The bottom blind groove 221 is located at Figure 4 The non-corner location is at the center of the base shown.

[0117] The following describes in detail the location of the blind groove 221 through several specific embodiments.

[0118] In conjunction with the reference manual Figure 6 , which shows a schematic diagram of the location of the blind groove 221 provided in one embodiment of the present application. Figure 6 As shown, blind grooves 221 are provided at three positions, namely, the upper left corner, the upper right corner, and the lower right corner of the frame 22 of the middle frame 20. The distance between the blind groove 221 at the upper left corner and the left side of the frame 22 is recorded as A1, and the distance between the blind groove 221 at the upper right corner and the right side of the frame 22 is recorded as B1, and the distance between the blind groove 221 at the upper right corner and the top side of the frame 22 is recorded as B2. The distance between the blind groove 221 at the lower right corner and the right side of the frame 22 is recorded as C1, and the distance between the blind groove 221 at the lower right corner and the bottom side of the frame 22 is recorded as C2, and the distance between the blind groove 221 at the lower right corner and the left side of the frame 22 is recorded as D1.

[0119] In some embodiments of the present application, Figure 6As shown, distance A1, distance B1 and distance C1 may be equal, and distance A2, distance B2 and distance C2 may also be equal. Distance D1 may be greater than distance A1, distance B1 and distance C1, and also greater than distance A2, distance B2 and distance C2. The proportional relationship between distance D1 and distance A1, distance B1 and distance C1 may be determined according to the actual needs of the edge grasping positioning algorithm. For example, the ratio between distance D1 and distance A1, distance B1 and distance C1 may be 4:1:1:1, and so on.

[0120] In the embodiment of the present application, during the process of assembling the display screen 10, the CCD device can first identify the three blind grooves 221 (i.e., marking points) on the frame 22, and determine the center point coordinates of each blind groove 221 (recorded as marking point coordinates). Then, the CCD device can capture the distance data between each marking point coordinate and the two adjacent sides on the frame 22, that is, capture four sets of distance data of distance A1 / distance A2, distance B1 / distance B2, distance C1 / distance C2, and distance D1. Through matrix conversion, the three marking point coordinates can be converted into the manipulator coordinate system, and the four sets of distance data captured by the CCD device and the three marking point coordinates in the manipulator coordinate system are passed to the external screen manipulator assembly program, so that the external screen manipulator assembly program can convert the coordinates of the frame 22 in the manipulator coordinate system according to the three marking point coordinates and the four sets of distance data in the manipulator coordinate system, so that the manipulator can center the display screen 10 in the display screen bin according to the converted coordinates.

[0121] Among them, the manipulator coordinate system refers to a coordinate system built in the direction of the manipulator's three-dimensional spatial movement. The existing coordinate conversion method can be used to convert the coordinates of the three marking points into the manipulator coordinate system, and the embodiments of the present application will not be repeated here. In addition, various types of existing image recognition methods can be used to identify the blind groove 221 and determine the coordinates of the center point of the blind groove 221, and the embodiments of the present application will not be repeated here.

[0122] In some embodiments, the Figure 7 , which shows a schematic diagram of the location of the blind groove 221 provided in another embodiment of the present application. Figure 7As shown, blind grooves 221 are provided at three positions, namely, the upper left corner, the upper right corner, and the lower right corner, of the frame 22 of the middle frame 20. The distance A1 between the blind groove 221 at the upper left corner and the left side of the frame 22 may be greater than the distance B1 between the blind groove 221 at the upper right corner and the right side of the frame 22 and the distance C1 between the blind groove 221 at the lower right corner and the right side of the frame 22. The distances B1 and C1 may be equal, and the distance D1 between the blind groove 221 at the lower right corner and the left side of the frame 22 may be greater than the distance A1. The proportional relationship between the distances D1, A1, B1, and C1 is not limited here, and in specific implementation, those skilled in the art may determine it according to actual needs. For example, the proportional relationship between the distances D1, A1, B1, and C1 may be 7:2:1:1, and so on.

[0123] like Figure 7 As shown, the distance A2 between the blind groove 221 at the upper left corner and the top edge of the frame 22 can be smaller than the distance B2 between the blind groove 221 at the upper right corner and the top edge of the frame 22, and the distance B2 can be smaller than the distance C2 between the blind groove 221 at the lower right corner and the bottom edge of the frame 22. The proportional relationship between the distance A2, the distance B2 and the distance C2 can be determined according to the actual needs of the edge grabbing positioning algorithm. For example, the proportional relationship between the distance A2, the distance B2 and the distance C2 can be 1:2:3, and so on.

[0124] It should be noted that the above-mentioned position setting methods of the blind grooves 221 and the proportional relationships between the various distances are all examples. In specific implementations, the blind grooves 221 can also be set at other positions according to the actual structure of the mobile phone 100, and / or, the size relationship or proportional relationship between the distances A1, B1, C1 and D1, and the size relationship or proportional relationship between the distances A2, B2 and C2 can be set to other situations. It is only necessary to ensure that the accurate edge grasping positioning of the frame 22 can be achieved according to the blind grooves 221 set on the frame 22, and the embodiments of the present application are not limited to this.

[0125] In conjunction with the reference manual Figure 8 , which shows a schematic diagram of the preparation process of the middle frame 20 provided in one embodiment of the present application. In this specific embodiment, the middle plate 21 of the middle frame 20 is made of metal material as a whole, and the frame 22 is made of plastic material as a whole. Figure 8 As shown, the preparation process of the middle frame 20 includes the following steps:

[0126] S810: Prepare metal raw materials, and process the metal raw materials to form the middle plate 21.

[0127] In the embodiment of the present application, the metal raw material can be aluminum alloy, stainless steel, titanium or titanium alloy, etc.

[0128] In the embodiment of the present application, the metal raw material can be machined once to form a middle plate 21, and the thickness of the middle plate 21 can be, for example, 3 mm. Then, various required structures can be machined on the middle plate 21, such as Figure 2 The opening shown is for mounting the circuit board 30 , and the battery compartment for mounting the battery 40 , etc.

[0129] S820: configuring a mold, placing the prepared middle plate 21 in the mold, using plastic material for integral injection molding to form a frame 22 surrounding the middle plate 21 , and forming a plurality of blind grooves 221 on a first surface of the frame 22 .

[0130] In the embodiment of the present application, the plastic material may be PC, ABS, a combination of PC and ABS, PPA, PA, PBT, PPS, PEEK, a combination of PPA and PA, and the like.

[0131] In the embodiment of the present application, a mold required for injection molding can be pre-configured, and the mold can include an upper mold and a lower mold, and the upper mold and the lower mold are enclosed to form a cavity, and the inner surface shape of the cavity is similar to Figures 4 to 7 The outer surface shape of the middle frame 20 shown is the same. Then, the middle plate 21 prepared in step S810 can be placed in the mold. Then, the plastic material used to form the frame 22 can be heated to a molten state, and the molten plastic material can be injected into the mold cavity of the mold. After the plastic material is condensed and solidified, a frame 22 arranged around the middle plate 21 can be formed, thereby obtaining a middle plate 21 and a frame 22 of an integrated structure, that is, a middle frame 20. At this time, the middle plate 21 and the frame 22 can have a good bonding effect.

[0132] In the embodiment of the present application, the thickness of the frame 22 formed by integral injection molding is not limited herein. During specific implementation, those skilled in the art may determine the thickness according to the size requirements of the mobile phone 100 and the like.

[0133] In the embodiment of the present application, due to the setting of the inner surface shape of the mold, a plurality of blind grooves 221 can be formed on the first surface of the frame 22 formed by integral injection molding. The first surface of the frame 22 refers to the side surface that will be close to the display screen 10 of the mobile phone 100 after the mobile phone 100 is assembled.

[0134] S830: Disposing a marking layer 2211 at the bottom of the blind groove 221 , wherein the marking layer 2211 is used to mark the position of the corresponding blind groove 221 under lighting conditions.

[0135] In the embodiment of the present application, the bottom surface of the blind groove 221 may be polished to obtain the identification layer 2211, or the bottom surface of the blind groove 221 may be coated with a reflective material having a different reflective coefficient from other areas 2212 of the first surface of the frame 22 to obtain the identification layer 2211, or the bottom surface of the blind groove 221 may be coated with a material having a different color from other areas 2212 of the first surface of the frame 22 to obtain the identification layer 2211, or identification information may be set on the bottom surface of the blind groove 221 to obtain the identification layer 2211. The purpose of setting the identification layer 2211 is to enable the blind groove 221 to be well identified under lighting conditions, so as to accurately obtain information such as the coordinates of the center point of the blind groove 221.

[0136] Specifically, when the bottom surface of the blind groove 221 is polished to increase the reflection coefficient to obtain the identification layer 2211, the other areas 2212 of the first surface of the frame 22 can also be matte treated to reduce the reflection coefficient of the other areas 2212 of the first surface of the frame 22, thereby increasing the difference in reflection coefficient between the identification layer 2211 and the other areas 2212 of the first surface of the frame 22, and increasing the brightness difference between the identification layer 2211 and the other areas 2212 of the first surface of the frame 22 under lighting conditions, thereby improving the subsequent recognition accuracy of the blind groove 221.

[0137] Specifically, when the bottom surface of the blind groove 221 is coated with a reflective material having a different reflective coefficient from other areas 2212 of the first surface of the frame 22 to obtain the identification layer 2211, the reflective coefficient of the coated reflective material can be greater than the reflective coefficient of other areas 2212 of the first surface of the frame 22, or less than the reflective coefficient of other areas 2212 of the first surface of the frame 22, and the embodiment of the present application does not limit this. The embodiment of the present application does not limit the type of reflective material, and those skilled in the art can select it according to actual needs during specific implementation.

[0138] Specifically, when the identification layer 2211 is obtained by coating the bottom surface of the blind groove 221 or the material having a different color from the other areas 2212 of the first surface of the frame 22, it is only necessary to make the coated material have a different color from the material of the other areas 2212 of the first surface of the frame 22. The embodiment of the present application does not limit the type of coating material. During specific implementation, technical personnel in this field can make a choice according to actual needs.

[0139] Specifically, when the identification information is set on the bottom surface of the blind groove 221 to obtain the identification layer 2211, it is only necessary to enable the identification information to be used to uniquely identify the blind groove corresponding thereto. The embodiment of the present application does not limit the type of identification information. During specific implementation, those skilled in the art can select according to actual needs.

[0140] It should be noted that the setting of the identification layer 2211 can also be achieved through a combination of the above-mentioned methods, for example, through a combination of reflective material and identification information, or through a combination of color and reflective material, etc., and the embodiments of the present application do not limit this.

[0141] In some embodiments, a polishing treatment may be performed on the area of ​​the inner surface of the mold cavity corresponding to the identification layer 2211 of the frame 22, so that the area of ​​the inner surface of the mold cavity corresponding to the identification layer 2211 of the frame 22 forms a bright processing surface. And / or, a matte treatment may be performed on other areas of the inner surface of the mold cavity, so that other areas of the inner surface of the mold cavity form a processing surface with lower gloss. At this time, injection molding through step S820 can form a bright surface at the bottom of the blind groove 221 on the first surface of the frame 22, that is, form the identification layer 2211 (reflective layer). And / or, a surface with lower gloss can be formed in other areas 2212 of the first surface of the frame 22.

[0142] That is to say, in some embodiments, step S830 may not be performed, but the final middle frame 20 may be directly obtained by integral injection molding in step S820.

[0143] It should be noted that other contents in the embodiments of this application can be referred to Figures 4 to 7 The relevant contents of the illustrated embodiment will not be repeated in detail in the embodiments of the present application.

[0144] An embodiment of the present application further provides a mold for preparing the middle frame 20, the mold may include: an upper mold and a lower mold; the upper mold and the lower mold are enclosed to form a cavity, the inner surface shape of the cavity is similar to Figures 4 to 7 The outer surfaces of the middle frames 20 shown have the same shape.

[0145] In some embodiments, the inner surface of the cavity is polished in the area corresponding to the reflective layer of the frame 22, and the other areas of the inner surface of the cavity are matte treated. Through polishing, the inner surface of the cavity and the area corresponding to the reflective layer of the frame 22 can form a bright processing surface; through matte treatment, the other areas of the inner surface of the cavity can form a processing surface with lower gloss. When the mold is used for injection molding to obtain the middle frame 20, a bright surface, that is, a reflective layer, can be formed at the bottom of the blind groove 221 on the first surface of the frame 22, and a surface with lower gloss can be formed in the other areas 2212 of the first surface of the frame 22, so that under lighting conditions (for example, under the edge recognition light), the reflective layer at the bottom of the blind groove 221 and the other areas 2212 of the first surface of the frame 22 can achieve light and dark contrast, and the blind groove 221 (that is, the marking point) can be well identified, so as to accurately obtain information such as the coordinates of the center point of the blind groove 221.

[0146] An embodiment of the present application further provides an electronic device, which may include Figures 4 to 7 The middle frame 20 is shown.

[0147] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, or it can be an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0148] The terms "first", "second", "third", "fourth", etc. (if any) in the description and claims of the embodiments of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0149] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of the present application, rather than to limit them. Although the embodiments of the present application have been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A middle frame, applied to electronic equipment, characterized in that: The middle frame includes a frame and a middle plate, the frame is made of plastic material, a first surface of the frame is provided with a plurality of blind grooves, the first surface is a side surface of the frame close to the display screen of the electronic device, an identification layer is provided at the bottom of the blind groove, and the identification layer is used to identify the position of the corresponding blind groove under lighting conditions.

2. The middle frame according to claim 1, characterized in that: The identification layer is a reflective layer, and the reflective layer and other areas of the first surface have different reflective coefficients, so that the reflective layer and other areas of the first surface have different brightness under the lighting conditions.

3. The middle frame according to claim 2, characterized in that: The reflective layer is obtained by polishing the bottom surface of the blind groove; or, the reflective layer is obtained by coating the bottom surface of the blind groove with a reflective material having a different reflective coefficient from other areas of the first surface.

4. The middle frame according to claim 3, characterized in that: The other areas of the first surface are obtained by matte treatment.

5. The middle frame according to claim 1, characterized in that: The identification layer is obtained by coating the bottom surface of the blind groove with a material having a different color from other areas of the first surface; or, the identification layer is obtained by setting identification information on the bottom surface of the blind groove.

6. The middle frame according to claim 1, characterized in that: The blind groove and the frame are obtained by integral injection molding.

7. The middle frame according to claim 1, characterized in that: The number of the blind grooves is at least three, wherein at least one blind groove is disposed at each of the three corners of the frame.

8. The middle frame according to claim 7, characterized in that: The number of the blind grooves is three, which are respectively arranged at the upper left corner, the upper right corner and the lower right corner of the frame.

9. The middle frame according to claim 1, characterized in that: The number of the blind grooves is at least three, wherein at least one blind groove is provided at each of the two corners of the common first side of the frame, and at least one blind groove is provided at a non-corner position of the second side opposite to the first side.

10. A mold, characterized in that: For preparing a middle frame, the mold includes: Upper and lower dies; The upper mold and the lower mold are combined to form a cavity, and the inner surface shape of the cavity is the same as the outer surface shape of the middle frame described in any one of claims 1-9.

11. The mold according to claim 10, characterized in that: The area of ​​the inner surface of the cavity corresponding to the reflective layer of the frame is obtained by polishing, and the other areas of the inner surface of the cavity are obtained by matte treatment.

12. An electronic device, characterized in that: It comprises a middle frame as described in any one of claims 1 to 9.

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