CN118450022B

CN118450022B - Middle frame, mold and electronic device

Info

Publication number: CN118450022B
Application number: CN202311159823.4A
Authority: CN
Inventors: 杨红德; 何信伟; 杨力军
Original assignee: Honor Device Co Ltd
Current assignee: Honor Device Co Ltd
Priority date: 2023-09-08
Filing date: 2023-09-08
Publication date: 2025-03-21
Anticipated expiration: 2043-09-08
Also published as: CN118450022A

Abstract

The application provides a middle frame, a die and electronic equipment, wherein the middle frame is applied to the electronic equipment and comprises a frame and a middle plate, the frame is made of plastic materials, a plurality of blind grooves are formed in the first surface of the frame, the first surface is the surface of one side of the frame, which is close to a display screen of the electronic equipment, and an identification layer is arranged at the bottom of the blind groove and used for identifying the position of the blind groove corresponding to the identification layer under the illumination condition. According to the application, the frame made of plastic materials is close to one side surface of the display screen of the electronic equipment, a plurality of blind grooves are formed as the marking points, and the marking layer is arranged at the bottom of the blind grooves for marking, so that effective identification of the marking points is realized under the illumination condition, the assembly requirement of the display screen of the electronic equipment is met, and the assembly yield of the display screen is ensured. Compared with the existing metal marking point implementation mode, the problem that the marking point is failed to identify or inaccurate to identify due to the fact that metal CNC is easy to oxidize after being used can be avoided.

Description

Middle frame, mould and electronic equipment

Technical Field

The application relates to the technical field related to electronic equipment, in particular to a middle frame, a die and electronic equipment.

Background

With the continuous development of mobile terminal technology, the application of electronic devices such as smart phones and palm computers has become very popular, and becomes an important component in people's work and life. When the electronic device is assembled, a middle frame is usually installed first, and then components such as a circuit board, a battery, a display screen, a rear cover and the like are installed on the middle frame. In the process of installing the display screen, the accuracy of the display screen assembly is ensured by the marking points at the four corners of the middle frame.

Currently, in some embodiments, the electronics employ a metal center, four marker points are formed on the metal midplane of the center, typically by computer numerical control (ComputerNumerical Control, CNC) machining. However, metal CNCs are easily oxidized after being subjected to recognition failure of mark points, so that the assembly of electronic equipment is affected. In other embodiments, the electronic device adopts a middle frame structure of a plastic frame and a metal (for example, an X alloy) middle plate, four mark points are formed on the metal middle plate through CNC processing, and then a specific material (for example, polycarbonate (PC) or the like) is injected around the metal middle plate to form the middle frame structure of the plastic frame and the metal middle frame. Also, metal CNCs are susceptible to oxidation after they fail in identifying the marker points, affecting the assembly of the electronic device. In addition, the plastic frame and the middle frame structure of the metal middle frame use CNC processing marking points, and CNC processing tolerance and injection molding tolerance can enable the accumulated tolerance of the whole middle frame to be larger, so that the distance is over-limited when the edge is grabbed.

Disclosure of Invention

Some embodiments of the present application provide a middle frame, a mold and an electronic device, and the present application is described in the following aspects, which may be referred to with reference to the following embodiments and advantageous effects.

In a first aspect, an embodiment of the present application provides a middle frame, which is applied to an electronic device, where the middle frame includes a frame and a middle plate, the frame is made of a plastic material, a plurality of blind slots are formed on a first surface of the frame, the first surface is a surface of the frame, which is close to a display screen of the electronic device, and an identification layer is disposed at a bottom of the blind slot, and is used for identifying a position of the blind slot corresponding to the identification layer under an illumination condition.

According to the embodiment of the application, the frame made of the plastic material is close to the surface of one side of the display screen of the electronic equipment, a plurality of blind grooves are formed as the marking points, and the marking layer is arranged at the bottom of the blind grooves for marking, so that the marking points can be effectively identified under the illumination condition, the assembly requirement of the display screen of the electronic equipment is met, and the assembly yield of the display screen is ensured. Compared with the existing metal marking point implementation mode, the problem that the marking point is failed to identify or inaccurate to identify due to the fact that metal CNC is easy to oxidize after being used can be avoided.

In some embodiments, the marking layer is a light reflecting layer having a different light reflecting coefficient than other areas of the first surface, such that the light reflecting layer has a different brightness under the illumination condition than other areas of the first surface.

According to the embodiment of the application, the light reflecting layer is arranged at the bottom of the blind groove, and under the illumination condition, the light and shade contrast is realized through the light reflecting layer at the bottom of the blind groove and other areas on the surface of the frame, so that the effective identification of the marked points can be realized.

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

According to the embodiment of the application, the reflective layer is arranged through polishing treatment or the reflective layer is arranged through coating the reflective material, so that high contrast under polishing can be realized, and the implementation mode is simple and reliable.

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

According to the embodiment of the application, the matte treatment is carried out on other areas of the surface of the frame, so that the difference of the reflection coefficient between the reflection layer and the other areas of the surface of the frame can be further increased, and the light and shade contrast between the reflection layer and the other areas of the surface of the frame under the illumination condition is improved, thereby improving the identification precision of the marking points in the follow-up process.

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 by providing identification information on the bottom surface of the blind groove.

According to the embodiment of the application, the bottom of the blind groove is coated with the material with different colors from other areas on the surface of the frame, and under the illumination condition, the different colors are compared through the bottom of the blind groove and the other areas on the surface of the frame, so that the effective identification of the marked points can be realized. Through setting up identification information in the bottom of blind groove, under the illumination condition, can realize the effective discernment of mark point through identification information.

In some embodiments, the blind slot and the bezel are integrally injection molded.

According to the embodiment of the application, the blind groove and the frame are formed in an integral injection molding mode, so that the tolerance of the position degree of the mark point can be reduced, and the problem of over-limit distance during edge grabbing is avoided. And connect frame and medium plate through the mode of integrative moulding plastics, can guarantee the connection reliability of medium plate and frame.

In some embodiments, the number of blind slots is at least three, wherein at least one blind slot is provided at each of the three corners of the bezel.

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

In some embodiments, the number of blind slots is at least three, wherein at least one blind slot is provided at each of two corners of a common first edge of the bezel, and at least one blind slot is provided at a non-corner location of a second edge opposite the first edge.

According to the embodiment of the application, at least one marking point is respectively arranged at three corners of the frame, or at least one marking point is respectively arranged at two corners of the frame, which share the first edge, and at least one marking point is arranged at a non-corner position of the second edge opposite to the first edge, and the accurate edge grabbing and positioning of the frame are realized through the at least three marking points, so that the assembly requirement of the display screen of the electronic equipment can be met, and the assembly yield of the display screen is ensured to be not lower than that of an edge grabbing scheme in which four marking points are arranged at four corners of the frame.

In a second aspect, embodiments of the present application provide a mold for preparing a middle frame, the mold comprising:

An upper die and a lower die;

The upper die and the lower die are enclosed to form a die cavity, and the shape of the inner surface of the die cavity is the same as that of the outer surface of the middle frame provided in the first aspect.

According to the embodiment of the application, the mold for preparing the middle frame is formed, so that the mold can be used for injection molding to obtain the corresponding middle frame, and the preparation process is simple. And moreover, the middle frame prepared by the die can be used for forming a plurality of blind grooves as marking points on the surface of one side, close to the display screen of the electronic equipment, of the frame made of plastic materials, and the marking layers are arranged at the bottoms of the blind grooves to mark the blind grooves so as to realize effective identification of the marking points under the illumination condition, thereby meeting the assembly requirement of the display screen of the electronic equipment and ensuring the assembly yield of the display screen. Compared with the existing metal marking point implementation mode, the problem that the marking point is failed to identify or inaccurate to identify due to the fact that metal CNC is easy to oxidize after being used can be avoided.

In some embodiments, the area of the inner surface of the cavity corresponding to the reflective layer of the bezel is obtained by polishing, and the other area of the inner surface of the cavity is obtained by matte treatment.

According to the embodiment of the application, the polishing treatment is carried out on the area, corresponding to the reflective layer of the frame, of the die, and the matte treatment is carried out on other areas, so that when the die 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 glossiness is formed in other areas, thereby being beneficial to simplifying the preparation process.

The other advantages achieved by the second aspect may refer to the advantages of any embodiment of the first aspect of the present application, and will not be described here.

In a third aspect, an embodiment of the present application provides an electronic device, including a middle frame provided in the first aspect. The advantages achieved by the third aspect may refer to those of any embodiment of the first aspect of the present application, and will not be described herein.

Drawings

Fig. 1 is a schematic perspective view of a mobile phone according to an embodiment of the present application;

fig. 2 is an exploded view of a mobile phone according to an embodiment of the present application;

FIG. 3 is a schematic structural view of a center provided in accordance with some embodiments;

FIG. 4 is a schematic structural diagram of a middle frame according to an embodiment of the present application;

FIG. 5 is a partial cross-sectional view of a blind slot provided in accordance with an embodiment of the present application;

FIG. 6 is a schematic diagram of a blind slot arrangement according to an embodiment of the present application;

FIG. 7 is a schematic view of a blind slot arrangement according to another embodiment of the present application;

fig. 8 is a schematic diagram of a preparation process of a middle frame according to an embodiment of the present application.

Reference numerals illustrate:

100-mobile phone, 10-display screen, 20-middle frame, 21-middle plate, 211-mark point, 22-frame, 221-blind groove, 2211-mark layer, 2212-other area of the first surface, 23, 24-dotted line frame, 30-circuit board, 40-battery and 50-back cover.

Detailed Description

Illustrative embodiments of the application include, but are not limited to, a center, a mold, and an electronic device. The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application.

The middle frame provided by the embodiment of the application can be arranged in electronic equipment, and the electronic equipment can comprise mobile or fixed terminals with frames or shells, such as mobile phones, tablet computers, notebook computers, ultra-Mobile Personal Computer, UMPC (Ultra-mobile Personal computers), handheld computers, interphones, netbooks, POS (point of sale) machines, personal digital assistants (Personal DIGITALASSISTANT, PDA), automobile recorders, wearable equipment, virtual reality equipment, wireless U disk, bluetooth sound/earphone, or vehicle-mounted terminals. The embodiment of the application does not limit the specific form of the electronic device, and for convenience of understanding, the electronic device is taken as an example of a mobile phone.

Referring to fig. 1 and fig. 2 of the drawings, fig. 1 is a schematic perspective view of a mobile phone 100 according to an embodiment of the present application, and fig. 2 is an exploded view corresponding to the mobile phone 100 shown in fig. 1. As shown in fig. 2, the mobile phone 100 may include a display 10 and a rear cover 50, and a middle frame 20, a circuit board 30, a battery 40, and the like may be disposed between the display 10 and the rear 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 components such as 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 components such as the circuit board 30 and the battery 40 may be disposed on a side of the middle frame 20 facing the display screen 10.

When the circuit board 30 is disposed on the middle frame 20, an opening (as shown by a dashed frame 23 in fig. 2) may be formed in the middle frame 20, so that the component on the circuit board 30 may be disposed at the opening of the middle frame 20.

Where the battery 40 is disposed on the middle frame 20, for example, a battery compartment may be disposed on a side of the rear cover 50 facing the middle frame 20, and the battery 40 is mounted in the battery compartment (as shown by the dashed frame 24 in fig. 2). In the embodiment of the present application, the battery 40 may be connected to the charge management module and the circuit board 30 through a power management module, where the power management module receives the input of the battery 40 and/or the charge management module and supplies power to the processor, the internal memory, the external memory, the display screen 10, the camera, the communication module, and the like. The power management module may also be configured to monitor parameters such as the capacity of the battery 40, the number of cycles of the battery 40, and the state of health (leakage, impedance) of the battery 40. In other embodiments, the power management module may also be provided in the processor of the circuit board 30. In other embodiments, the power management module and the charge management module may be disposed in the same device.

The display 10 may be an Organic Light-Emitting Diode (OLED) display or a Liquid crystal display (Liquid CRYSTAL DISPLAY, LCD). It should be appreciated that the display screen 10 may include a display for outputting display content to a user and a touch device for receiving touch events entered by the user on the display screen 10.

The display 10 may be a flexible display or a hard display, where the flexible display is provided with a foldable function, and can cooperate with the structural design of the rear cover 50 to implement operations such as folding the mobile phone 100. The display screen 10 may be a regular screen or a special-shaped screen, for example, the outer edge portion of the display screen 10 may be arranged in an arc shape to form a curved screen.

The display 10 may be disposed on the front surface of the mobile phone 100, may be disposed on the back surface of the mobile phone 100, or may be disposed on both the front and back surfaces of the mobile phone 100. The front surface of the mobile phone 100 may be understood as a surface facing the user when the user uses the mobile phone 100, and the back surface of the mobile phone 100 may be understood as a surface facing away from the user when the user uses the mobile phone 100.

The rear cover 50 may be a metal rear cover, a glass rear cover, a plastic rear cover, or a ceramic rear cover, and in the embodiment of the present application, the material of the rear cover 50 is not limited.

In some embodiments, as shown in fig. 2, middle frame 20 may include a metal middle plate 21 and a rim 22. The rim 22 is provided along the outer periphery of the metal middle plate 21. For example, the rim 22 may surround the outer periphery of the metal middle plate 21, or may be an unclosed one. The rim 22 may include oppositely disposed top and bottom edges, and oppositely disposed left and right edges located between the top and bottom edges. The connection between the frame 22 and the metal middle plate 21 includes, but is not limited to, welding, clamping and integral injection molding. 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. 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.

It should be understood that the structure illustrated in the embodiments of the present application is not limited to the specific embodiment of the mobile phone 100. In other embodiments of the application, the handset 100 may include more or fewer components than shown, or certain components may be combined, or certain components may be split, or different arrangements of components. For example, the cell phone 100 may also include cameras (e.g., front and rear cameras) and flash lights.

In practical applications, when the mobile phone 100 is assembled, the middle frame 20 is usually set, and then the circuit board 30, the battery 40, the display 10, the rear cover 50, and other components are mounted on the middle frame 20. In the process of installing the display screen 10, the accuracy of the assembly of the display screen 10 needs to be ensured by the marked points on the middle frame 20.

Referring to fig. 3 in conjunction with the description, a schematic diagram of a center 20 provided in accordance with some embodiments is shown. As shown in fig. 3, four mark points 211 may be formed by CNC machining on four corners of the metal middle plate 21 of the middle frame 20. The shape of the mark points 211 may be a circle as shown in fig. 3, or may be other shapes, such as a triangle, a quadrilateral, a hexagon, or a polygon with an equal side, or a polygon with a different side and a stripe shape. 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, which is not particularly limited in the embodiment of the present application.

In the process of assembling the display screen 10, a Charge-Coupled Device (CCD) Device may first identify the mark points 211 on the four corners of the metal middle plate 21, and determine the center point coordinates (denoted as mark point coordinates) of the respective mark points 211. Then, the distance data between each marking point coordinate and two adjacent edges on the frame 22 can be captured, and then each marking point coordinate is converted into a manipulator coordinate system. Finally, according to the grasped 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 is correctly installed in the display screen bin.

The manipulator coordinate system is a coordinate system built in the direction of the three-dimensional space motion of the manipulator, and the coordinates of the four marking points can be converted into the manipulator coordinate system by adopting the existing coordinate conversion method, so that the embodiment of the application is not repeated here. Moreover, various existing image recognition methods may be used to identify the mark point 211 and determine the center point coordinate of the mark point 211, which is not described herein.

However, the metal CNC is easy to oxidize, so that the identification of the mark point is failed, and the assembly of the mobile phone is affected. In addition, the middle frame structure of plastic frame + metal medium plate uses CNC to process the mark point, CNC machining tolerance and tolerance of moulding plastics can make the accumulative total tolerance of whole middle frame great, leads to grabbing the distance overrun in limit.

In order to solve the problems, the embodiment of the application provides a middle frame, a die and electronic equipment, wherein a plurality of blind grooves are formed on the surface of a side frame made of plastic materials, which is close to a display screen of the electronic equipment, as marking points, and a marking layer is arranged at the bottom of each blind groove to mark so as to effectively identify the marking points under the illumination condition, thereby meeting the assembly requirement of the display screen of the electronic equipment and ensuring the assembly yield of the display screen. Compared with the existing metal marking point implementation mode, the problem that the marking point is failed to identify or inaccurate to identify due to the fact that metal CNC is easy to oxidize after being used can be avoided.

According to one embodiment of the application, the light reflecting layer is arranged at the bottom of the blind groove, and under the illumination condition, the light and shade contrast is realized through the light reflecting layer at the bottom of the blind groove and other areas on the surface of the frame, so that the effective identification of the marked points can be realized.

According to one embodiment of the application, the bottom of the blind groove is coated with the material with different colors from other areas of the surface of the frame, and under the illumination condition, the comparison of different colors is realized through the bottom of the blind groove and the other areas of the surface of the frame, so that the effective identification of the marked points can be realized. Through setting up identification information in the bottom of blind groove, under the illumination condition, can realize the effective discernment of mark point through identification information.

According to one embodiment of the application, three marking points are arranged at the positions of the upper left corner, the upper right corner and the lower right corner of the frame, and the edge grabbing is accurately realized through the three marking points, so that the assembly requirement of the display screen of the electronic equipment can be met, and the assembly yield of the display screen is ensured to be not lower than an edge grabbing scheme with four marking points.

The structure of the middle frame provided by the embodiment of the application is described below with reference to specific embodiments.

Referring to fig. 4 of the drawings, a schematic diagram of a middle frame according to an embodiment of the present application is shown. As shown in fig. 4, the middle frame 20 may include a middle plate 21 and a rim 22. The middle plate 21 is made of a metal material, and the kind of the metal material is not limited herein, and one skilled in the art can select according to actual needs when implementing the present application. For example, the material of the middle plate 21 may be an aluminum alloy, stainless steel, or the like. The frame 22 is made of plastic material, and the type of plastic material is not limited herein, and one skilled in the art can select according to actual needs when implementing the present application. For example, the material of the frame 22 may be one or more of PC, acrylonitrile-butadiene-styrene copolymer (Acrylonitrile Butadiene Styrene, ABS), a combination of PC and ABS, polyphthalamide (Polyphthalamide, PPA), polyamide (Polyamide, PA), polybutylene terephthalate (Polybutylene Terephthalate, PBT), polyphenylene sulfide (Polyphenylene Sulfide, PPS), polyether ether ketone (Poly ETHER ETHER Ketone, PEEK), a combination of PPA and PA, and the like.

It should be clear that when the plastic material is a combination of materials, for example, a combination of PPA and PA, the ratio between PPA and PA is not limited, and no matter what ratio is adopted between the PPA and PA, the plastic material is a mixture of two existing materials of PPA and PA, and should not be interpreted as a new material. In practice, the choice of plastic material will depend on the particular manufacturing process of the frame 22. In the process of manufacturing the frame 22, it is also generally necessary to grind, polish, and other physicochemical treatments on the frame 22, so that the frame 22 can obtain a corresponding appearance effect. In the case of different processing steps, different plastic materials may be selected to make the bezel 22.

In some embodiments, additives may also be added to the plastic material, such as additives for reducing cooling distortion, glass fibers, and the like. Compared with the metal material, the plastic material has relatively poor molding capability and is easy to deform in the cooling and solidifying process. In order to ensure a better appearance effect of the frame, in the embodiment of the application, additives can be added into the plastic material of the injection molded frame 22 to reduce deformation of the plastic material during condensation and solidification, and the strength of the frame can be improved to improve the surface quality of the frame after condensation and solidification, so that a better appearance effect can be ensured.

It can be understood that the larger the additive amount, the smaller the cooling deformation of the formed frame, and the smaller the additive amount, the smaller the influence of the additive on the flowability of the plastic material, which is more beneficial to the injection molding of the frame. In this way, when the amount of the additive to be added is selected, it is actually necessary to comprehensively consider the cooling deformability and flowability of the plastic material. In the concrete implementation, the weight ratio of the additive to the plastic material can be set below 65%, and the cooling deformation capacity and the fluidity of the plastic material can be well considered.

In some embodiments, the middle plate 21 may be partially provided as a plastic plate portion, and in this case, the middle plate 21 may include a metal plate portion and a plastic plate portion. The embodiment of the present application is not limited to the arrangement position of the plastic plate portion in the middle plate 21, and in practice, those skilled in the art may perform the arrangement according to actual needs. For example, the region of the middle plate 21 where molding is required (e.g., the region where the battery compartment is provided, etc.) may be still made of a metal material to facilitate molding. The other areas of the middle plate 21 are made of plastic plate parts so as to realize the technical purpose of weight reduction. When part of the middle plate 21 is a plastic plate portion, only one area may be provided on the middle plate 21 as a plastic plate portion, or a plurality of areas may be provided as a plastic plate portion, which may be selected in the implementation.

It can be understood that the weight of the middle plate can be greatly reduced by arranging at least part of the middle plate into the plastic plate part, so that the weight of the middle frame can be reduced, and the light-weight design requirement of the equipment can be better met.

In some embodiments, the frame 22 may also be partially configured as a metal frame, where the frame 22 may include a metal frame and a plastic frame. When the part of the frame 22 is a metal frame, only one area may be provided as the metal frame on the frame 22, or a plurality of areas may be provided as the metal frame, and both of these two may be the choice for implementation. When the part of the frame 22 is a metal frame, the blind groove 221 on the frame 22 may be disposed in the area of the plastic frame.

It can be understood that the strength of the frame can be improved by setting at least part of the frame to be a metal frame part, and the diversified demands of the appearance can be satisfied.

It should be noted that, in practical application, it is preferable to set all of the middle plate 21 to be a metal plate portion and all of the frame 22 to be a plastic frame portion, so that the processing and forming of the middle plate 21 and the frame 22, the connection of the middle plate 21 and the frame 22, and the like can be relatively simple, which is beneficial to simplifying the preparation process.

As shown in fig. 4, the rim 22 may be disposed around the middle plate 21, and the rim 22 may form a closed ring shape. The middle plate 21 is located inside the rim 22. The middle plate 21 may be connected to the rim 22 in a thickness direction (a direction shown by a dotted line in a lower left corner coordinate system of fig. 4, the thickness direction being perpendicular to the width direction and the length direction) of the cellular phone 100. The connection position between the middle plate 21 and the frame 22 is not limited herein, and may be determined by those skilled in the art according to actual design requirements in practice. Illustratively, middle plate 21 and rim 22 may be connected at four corners of middle plate 21, or may be connected at some or all of the edges of middle plate 21.

In addition, the connection mode of the middle plate 21 and the frame 22 is not limited in the embodiment of the present application. The middle plate 21 and the frame 22 may be in an integral structure, or the middle plate 21 may be a separately provided member, and then may be connected to the frame 22 by a mechanical connection method such as welding or bonding.

In practice, a desired mold may be configured, the specific structure of the mold may be determined according to actual needs, then, the metal material may be used to make the middle plate 21, the prepared middle plate 21 may be placed in the mold, then, the plastic material used to form the frame 22 may be heated to a molten state, and the molten plastic material may be injected into a cavity of the mold, and after the plastic material is condensed and solidified, the frame 22 disposed around the middle plate 21 may be formed, thereby obtaining the middle plate 21 and the frame 22 of an integral structure. In this case, a good joining effect can be obtained between the middle plate 21 and the frame 22. Specifically, the thickness of the frame 22 formed by direct injection molding is not limited herein, and one skilled in the art can determine the thickness according to the size requirements of the mobile phone 100, etc. in practical implementation.

It can be appreciated that the connection reliability of the middle plate and the frame can be ensured by connecting the frame and the middle plate in an integrally injection molding manner.

As shown in fig. 4, the first surface of the frame 22 is provided with a plurality of blind grooves 221 as marking points. The first surface of the bezel 22 is a surface of one side of the display 10 that is to be close to the mobile phone 100 after the mobile phone 100 is assembled. During assembly, the mounting device facing the display screen 10 serves as a target surface, i.e., a first surface, to which the display screen 10 is to be mounted.

In the embodiment of the present application, the blind groove 221 may be a groove body with an open top, the top of the blind groove 221 is a side close to the display screen 10 of the mobile phone 100, and the bottom of the blind groove 221 is a side far 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 may be smaller than the thickness of the bezel 22 at other locations of the area where the blind groove 221 is located. The blind groove 221 may be circular in shape as shown in fig. 4, or may be other shapes, such as a triangle, a quadrangle, a hexagon, or the like, an equilateral polygon, or a non-equilateral polygon in a stripe shape, or the like. The embodiment of the present application is not particularly limited thereto. The size and depth of the blind grooves 221 are not limited herein, and may be selected by those skilled in the art according to actual needs in practice. By way of example, in an embodiment according to the application, a circular blind groove with a diameter of 1.6mm-2.4mm and a depth of 0.5mm-1mm may be provided.

In addition, the embodiment of the application also allows for various ways of forming the blind grooves 221. The blind groove 221 and the bezel 22 may be formed by integral injection molding, or may be formed by grooving a corresponding region on the first surface of the bezel 22, such that the blind groove 221 is formed in the bezel 22.

Reference is made to fig. 5 of the drawings, which shows a partial cross-sectional view of a blind slot of a center provided in accordance with one embodiment of the present application. As shown in fig. 5, the bottom of the blind groove 221 is provided with an identification layer 2211, and the identification layer 2211 can be used for identifying the position of the blind groove 221 corresponding to the identification layer under the lighting condition.

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 marking layer 2211 may be a circle, or may be other shapes, such as a triangle, a quadrilateral, a hexagon, or a polygon with equal sides or a polygon with unequal sides and a stripe shape, which is not particularly limited in the embodiment of the present application. The size of the identification layer 2211 may be smaller 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 made equal to the size of the bottom surface of the blind groove 221, which is not particularly limited in the embodiment of the present application.

It can be appreciated that by providing the identification layer 2211 smaller than the bottom surface of the blind groove 221, the processing time can be saved, the preparation efficiency of the entire middle frame can be improved, and the processing is easy. By arranging the identification layer 2211 equal to the bottom surface of the blind groove 221, the blind groove 221 can be accurately identified based on the identification layer 2211, and the success rate of identification is ensured.

It should be noted that, in the case where the size of the identification layer 2211 is smaller than the size of the bottom surface of the blind groove 221, the center point position of the identification layer 2211 may be preferably made to coincide with the center point position of the blind groove 221.

It can be understood that a plurality of blind grooves are formed on the surface of one side, close to the display screen of the mobile phone, of the frame made of plastic materials to serve as marking points, and the marking layer is arranged at the bottom of each blind groove to mark, so that effective identification of the marking points is realized under the illumination condition, the assembly requirement of the display screen of the mobile phone is met, and the assembly yield of the display screen is ensured. Compared with the existing implementation mode of the metal mark points, the blind groove formed by the plastic material is used as the mark point, so that the problems that the mark point is failed to identify or inaccurate in identification due to easy oxidation after metal CNC is avoided.

The identification layer 2211 is arranged to enable the blind groove 221 to be well identified under the illumination condition, so that information such as the center point coordinate of the blind groove 221 can be accurately acquired. The illumination condition may be the light of the edge grabbing recognition of various CCD devices, visible light, or invisible light such as infrared light, and the embodiment of the application is not limited herein. In practice, the lighting conditions may preferably be set to visible white light.

In some embodiments, the marking layer 2211 may be a light reflective layer, which has a light reflective coefficient different from that of the other areas 2212 of the first surface of the bezel 22 under the above-mentioned illumination conditions, so that the light reflective layer has a different brightness from the other areas 2212 of the first surface of the bezel 22 under the illumination conditions. The reflection coefficient refers to the ratio of the intensity of the reflected light reflected by the surface of the incident light to the intensity of the incident light when the incident light irradiates the object, and can be used for identifying the reflection capability of the object. Under the same illumination condition, the intensity of light reflected by the object with larger reflection coefficient is higher, the brightness of the object is higher, the intensity of light reflected by the object with smaller reflection coefficient is lower, and the brightness of the object is lower.

It can be understood that the light-reflecting layer is arranged at the bottom of the blind groove, and under the illumination condition, the light-shade contrast is realized through the light-reflecting layer at the bottom of the blind groove and other areas on the surface of the frame, so that the effective identification of the mark point can be realized.

In some embodiments, the light reflective layer may be processed such that the light reflective coefficient is greater than the light reflective coefficient of the other areas 2212 of the first surface of the bezel 22, such that the brightness of the light reflective layer is higher than the brightness of the other areas 2212 of the first surface of the bezel 22 under light conditions.

Alternatively, the light reflecting layer may be obtained by polishing the bottom surface of the blind groove 221. The polishing treatment is a treatment process for finishing the surface of a workpiece by using a flexible polishing tool and abrasive particles or other polishing media to obtain a smooth surface or specular gloss.

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

It should be noted that, the bottom surface of the blind groove 221 may be polished by the existing polishing method to obtain the reflective layer, for example, the polishing wheel rotating at a high speed may 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 micro cuts the bottom surface of the blind groove 221 to obtain the bright reflective layer, which is not described herein in detail in the embodiments of the present application.

It should be noted that, in some embodiments, when the mold for manufacturing the middle frame 20 is produced, the polishing wheel rotating at a high speed is pressed against the area corresponding to the reflective layer of the frame 22 on the inner surface of the mold, so that the micro powder abrasive coated on the rim of the polishing wheel rolls and micro cuts the area, thereby obtaining a bright processing surface, and thus, when the mold is used for injection molding to obtain the middle frame 20, a bright reflective layer can be formed.

It can be understood that the arrangement of the reflective layer can be realized through polishing treatment, so that high contrast under illumination conditions can be realized, and the realization mode is simple and reliable.

In some embodiments, while polishing the bottom surface of the blind groove 221 to improve the reflection coefficient, 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 as to improve the difference of the reflection coefficient between the reflection layer and the other areas 2212 of the first surface of the frame 22, and improve the brightness difference between the reflection layer and the other areas 2212 of the first surface of the frame 22 under the lighting condition, so as to improve the recognition accuracy of the blind groove 221.

It can be understood that by performing matte treatment on other areas of the surface of the frame, the difference of reflection coefficients between the reflection layer and other areas of the surface of the frame can be further increased, and the light-dark contrast between the reflection layer and other areas of the surface of the frame under the illumination condition is improved, so that the identification precision of the marking points is improved.

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 reflection layer with a reflection coefficient greater than that of the other areas 2212 of the first surface of the frame 22.

It should be noted that, the other areas 2212 on the first surface of the frame 22 may be subjected to matte processing by using an existing matte processing method, which is not described herein. In some embodiments, when the mold for preparing the middle frame 20 is generated, the inner surface of the mold is subjected to matte treatment in the area corresponding to the other area 2212 of the first surface of the frame 22, so that a processing surface with lower glossiness can be obtained, and thus, when the mold is used for injection molding to obtain the middle frame 20, the surface with lower glossiness can be formed.

In addition, in some alternative embodiments, the reflection coefficient of the reflection layer may be made smaller than the reflection coefficient of the other areas 2212 of the first surface of the bezel 22, so that the brightness of the reflection layer is lower than the brightness of the other areas 2212 of the first surface of the bezel 22 under the lighting condition.

Alternatively, the reflective layer may be obtained by performing a matte treatment on the bottom surface of the blind groove 221. The reflection coefficient of the bottom surface of the blind groove 221 may be reduced by the matte treatment, so that the bottom surface of the blind groove 221 forms a reflection layer having a reflection coefficient smaller than that of the other areas 2212 of the first surface of the bezel 22.

It should be noted that, the bottom surface of the blind groove 221 may be subjected to matte treatment by the existing matte treatment method to obtain the reflective layer, which is not described herein again in the embodiment of the present application. In some embodiments, when the mold for preparing the middle frame 20 is generated, the inner surface of the mold is subjected to matte treatment in the area corresponding to the reflective layer of the frame 22, so that a reflective layer with lower glossiness can be formed when the mold is used for injection molding the middle frame 20.

It can be understood that the setting of the reflecting layer is realized through matte treatment, and the high contrast under the illumination condition can be realized, so that the realization mode is simple and reliable.

In some embodiments, while the bottom surface of the blind groove 221 is subjected to matte treatment to reduce the reflection coefficient, other areas 2212 of the first surface of the frame 22 may be subjected to polishing treatment to improve the reflection coefficient of other areas 2212 of the first surface of the frame 22, so as to improve the difference of the reflection coefficient between the reflection layer and the reflection coefficient of other areas 2212 of the first surface of the frame 22, and improve the brightness difference between the reflection layer and the other areas 2212 of the first surface of the frame 22 under the illumination condition, so as to improve the recognition accuracy of the blind groove 221.

It can be understood that the polishing treatment is performed on other areas of the surface of the frame, so that the difference of reflection coefficients between the reflection layer and other areas of the surface of the frame can be further increased, and the light and shade contrast between the reflection layer and other areas of the surface of the frame under the illumination condition is improved, thereby improving the identification precision of the marking points.

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

It should be noted that, the polishing process may be performed on the other area 2212 of the first surface of the frame 22 by using a conventional polishing process method, which is not described herein. In some embodiments, a bright working surface may also be obtained by polishing the inner surface of the mold corresponding to the other area 2212 of the first surface of the frame 22 when the mold for preparing the middle frame 20 is produced, so that a bright surface may be formed when the mold is used for injection molding the middle frame 20.

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

Specifically, the kind of the reflective material is not limited herein, and in practice, a person skilled in the art may choose to choose according to actual needs, so long as the coated reflective material has a different reflection coefficient from the material of the other area 2212 of the first surface of the bezel 22. That is, the reflection coefficient of the reflective material coated on the bottom surface of the blind groove 221 may be greater than the reflection coefficient of the other areas 2212 of the first surface of the frame 22, or may be less than the reflection coefficient of the other areas 2212 of the first surface of the frame 22, which is not limited herein. For example, when the frame 22 is made of PC material, a reflective layer made of ABS material may be coated on the bottom surface of the blind groove 221, or when the frame 22 is made of ABS material, a reflective layer made of PC material may be coated on the bottom surface of the blind groove 221, or a reflective layer made of metal may be coated on the bottom surface of the blind groove 221. The thickness of the reflective layer is not limited herein, and may be selected by those skilled in the art according to actual needs in practice. For example, it may be set to 20 μm to 50 μm, and so on.

It can be understood that the reflective layer is arranged by coating the reflective material, so that high contrast under illumination conditions can be realized, and the implementation mode is simple and reliable.

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

Specifically, the kind of the coating material is not limited herein, and in practice, a person skilled in the art may choose according to actual needs, and only need to make the coating material have a different color from that of the other areas 2212 of the first surface of the bezel 22. For example, when the bezel 22 is white, a material of black, red, blue, or the like may be coated on the bottom surface of the blind groove 221, and so on. The thickness of the coating of the material is not limited herein, and may be selected by those skilled in the art according to actual needs in practice. For example, it may be set to 20 μm to 50 μm, and so on.

It can be understood that by coating the bottom of the blind groove with a material having a color different from that of other areas of the surface of the frame, under the illumination condition of visible light, different color contrast is realized through the bottom of the blind groove and other areas of the surface of the frame, and effective identification of the mark point can also be realized.

In some embodiments, the identification layer 2211 may also be obtained by disposing identification information on the bottom surface of the blind trench 221.

Specifically, the identification information may be used to uniquely identify the blind slot to which it corresponds. The type of the identification information is not limited herein, and one skilled in the art may select according to actual needs when implementing the present invention. For example, the bottom surface of the blind groove 221 may be provided with identification information carrying a "mark point" or "blind groove" word, and so on.

It can be appreciated that by setting the identification information at the bottom of the blind slot, effective identification of the mark point can be realized by the identification information under the illumination condition.

In practical applications, after the blind groove 221 is formed on the frame 22, polishing treatment is performed on the bottom surface of the blind groove 221 to obtain the identification layer 2211, or a reflective material with a different reflection coefficient from other areas 2212 on the first surface of the frame 22 is coated on the bottom surface of the blind groove 221 to obtain the identification layer 2211, or a material with a different color from other areas 2212 on the first surface of the frame 22 is coated to obtain the identification layer 2211, or identification information is set on the bottom surface of the blind groove 221 to obtain the identification layer 2211, so as to obtain the final middle frame structure. It should be noted that, the placement of the identification layer 2211 may also be implemented by a combination of the above several ways, for example, by a combination of the reflective material and the identification information, or by a combination of the color and the reflective material, which is not limited in the embodiment of the present application.

In the scenario shown in fig. 3, one blind groove 221 may be provided at each of the four corner positions of the bezel 22. In some alternative embodiments, the blind slots 221 may be located at central positions other than four corners of the bezel 22, such as the top, bottom, left, and right sides of the bezel 22, or a greater number of blind slots 221 may be located on the surface of the bezel 22, and so on.

In some embodiments, depending on architectural space issues that may exist in practical applications, blind slots cannot be provided at all four corners of the center. According to the embodiment of the application, at least one blind groove can be respectively arranged at three positions of the middle frame, for example, at three corners.

In some embodiments, as shown in fig. 4, the number of blind slots 221 may be three, disposed at the upper left, upper right and lower right corners of the bezel 22, respectively. In the scenario shown in fig. 4, due to the architecture space problem, the blind grooves 221 (i.e. the mark points) cannot be set at the lower left corner of the frame 22, so that the blind grooves 221 can be set only at the upper left corner, the upper right corner and the lower right corner of the frame 22, and by adjusting the edge grabbing program, the accurate edge grabbing positioning of the frame 22 can be realized through the three blind grooves 221, so that the assembly of the display screen 10 is realized, and the assembly yield of the display screen 10 is ensured to be not lower than that of the embodiment adopting four mark points.

It should be noted that the above embodiment in which the blind grooves 221 are provided at three positions of the upper left corner, the upper right corner, and the lower right corner of the frame 22 is merely an example, and the number of the blind grooves 221 provided on the frame 22 is at least three, wherein at least one blind groove 221 is provided at each of the three corners of the frame 22. For example, one blind groove 221 may be provided in each of the three corners, i.e., the upper left corner, the upper right corner, and the lower right corner, or two blind grooves 221 may be provided in each corner. For example, although only one blind slot 221 is provided in the upper left corner in fig. 4, 2 adjacent slots may be provided in the upper left corner. The location and number of blind slots 221 are not limited herein, and may be selected by one skilled in the art according to actual needs in practice.

In some embodiments, at least one blind slot 221 may also be provided at each of two corners of the common first edge of the bezel 22, and at least one blind slot 221 may be provided at a non-corner of a second edge opposite the first edge. For example, adjustments may be made on the basis of the arrangement shown in fig. 4 such that the lowermost blind slot 221 in fig. 4 is located at a non-corner position at the center of the bottom edge shown in fig. 4.

The location of the blind slot 221 is described in detail below with several specific embodiments.

Referring to fig. 6, a schematic diagram of the placement of blind via 221 according to an embodiment of the present application is shown. As shown in fig. 6, the three positions of the upper left corner, the upper right corner and the lower right corner of the rim 22 of the middle frame 20 are provided with blind grooves 221. Wherein, the distance between the left upper blind groove 221 and the left side of the frame 22 is denoted as A1, the distance between the right upper blind groove 221 and the right side of the frame 22 is denoted as B2, the distance between the right lower blind groove 221 and the right side of the frame 22 is denoted as C1, the distance between the right lower blind groove 221 and the bottom side of the frame 22 is denoted as C2, and the distance between the left blind groove 221 and the left side of the frame 22 is denoted as D1.

In some embodiments of the present application, as shown in fig. 6, the distances A1, B1, and C1 may be equal, and the distances A2, B2, and C2 may be equal. Distance D1 may be greater than distances A1, B1, and C1, as well as distances A2, B2, and C2. The proportional relation between the distance D1 and the distances A1, B1 and C1 can be determined according to the actual requirement of the grabbing edge positioning algorithm. For example, the ratio between the distance D1 and the distance A1, the distance B1, and the distance C1 may be made 4:1:1:1, and so on.

In the embodiment of the present application, in the process of assembling the display screen 10, the CCD device may first identify three blind slots 221 (i.e. mark points) on the frame 22, and determine the coordinates of the center point of each blind slot 221 (denoted as the coordinates of the mark point). The CCD device can then capture the distance data between the coordinates of each marker point and the two edges of the frame 22 adjacent thereto, namely four sets of distance data, namely capture distance A1/distance A2, distance B1/distance B2, distance C1/distance C2, and distance D1. Through matrix conversion, three mark point coordinates can be converted into a manipulator coordinate system, four groups of distance data captured by CCD equipment and three mark point coordinates in the manipulator coordinate system are transmitted to an external screen manipulator assembly program, the external screen manipulator assembly program can convert the three mark point coordinates and four groups of distance data in the manipulator coordinate system to obtain the coordinates of the frame 22 in the manipulator coordinate system, and then the manipulator can center the display screen 10 in a display screen bin according to the converted coordinates.

The manipulator coordinate system is a coordinate system built in the direction of the three-dimensional space motion of the manipulator, and three mark points can be converted into the manipulator coordinate system by adopting the existing coordinate conversion method, so that the embodiment of the application is not repeated here. In addition, various existing image recognition methods may be used to identify the blind slot 221, and determine the coordinates of the center point of the blind slot 221, which is not described herein.

In some embodiments, referring to fig. 7 in conjunction with the description, a schematic diagram of the placement of blind slots 221 is shown, according to another embodiment of the present application. As shown in fig. 7, the three positions of the upper left corner, the upper right corner and the lower right corner of the rim 22 of the middle frame 20 are provided with blind grooves 221. The distance A1 of the blind groove 221 in the upper left corner from the left side of the bezel 22 may be greater than the distance B1 of the blind groove 221 in the upper right corner from the right side of the bezel 22 and the distance C1 of the blind groove 221 in the lower right corner from the right side of the bezel 22, the distance B1 and the distance C1 may be equal, and the distance D1 of the blind groove 221 in the lower right corner from the left side of the bezel 22 may be greater than the distance A1. The proportional relation among the distance D1, the distance A1, the distance B1, and the distance C1 is not limited herein, and may be determined by one skilled in the art according to actual needs when the present application is implemented. For example, the proportional relationship among the distance D1, the distance A1, the distance B1, and the distance C1 may be made 7:2:1:1, and so on.

As shown in fig. 7, the distance A2 of the blind slot 221 in the upper left corner from the top edge of the bezel 22 may be smaller than the distance B2 of the blind slot 221 in the upper right corner from the top edge of the bezel 22, and the distance B2 may be smaller than the distance C2 of the blind slot 221 in the lower right corner from the bottom edge of the bezel 22. The proportional relation among the distance A2, the distance B2 and the distance C2 can be determined according to the actual requirement of the grabbing edge positioning algorithm. For example, the proportional relationship among the distance A2, the distance B2, and the distance C2 may be made 1:2:3, and so on.

It should be noted that, the above-mentioned positional setting manners of the blind slots 221 and the proportional relationships between the distances are all examples, and in a specific implementation, the blind slots 221 may be set at other positions according to an actual architecture of the mobile phone 100, and/or the size relationships or proportional relationships between the distances A1, B1, C1, and D1, and the size relationships or proportional relationships between the distances A2, B2, and C2 may be set as other cases, which only need to ensure that the accurate edge capturing positioning of the frame 22 can be achieved according to the blind slots 221 set on the frame 22.

Referring now to FIG. 8 of the drawings, a schematic illustration of a process for making a center 20 is provided in accordance with one embodiment of the present application. In this embodiment, the middle plate 21 of the middle frame 20 is made of metal material, and the frame 22 is made of plastic material. As shown in fig. 8, the preparation process of the middle frame 20 includes the following steps:

And S810, disposing a metal raw material and processing the metal raw material to form the middle plate 21.

In the embodiment of the application, the metal raw material can be aluminum alloy, stainless steel, titanium or titanium alloy and the like.

In the embodiment of the present application, the metal raw material may be machined once to form the middle plate 21, and the thickness of the middle plate 21 may be 3mm, for example. Various structures as required, such as an opening for mounting the circuit board 30 as shown in fig. 2, a battery compartment for mounting the battery 40, and the like, may then be machined on the middle plate 21.

S820, configuring a mold, placing the prepared middle plate 21 in the mold, integrally injection-molding the frame 22 around the middle plate 21 by using plastic material, and forming a plurality of blind grooves 221 on the first surface of the frame 22.

In the embodiment of the application, the plastic material may be PC, ABS, PC and ABS, PPA, PA, PBT, PPS, PEEK, PPA and PA, or the like.

In an embodiment of the present application, a mold required for injection molding may be configured in advance, and the mold may include an upper mold and a lower mold, which enclose a cavity, and an inner surface shape of the cavity is the same as an outer surface shape of the middle frame 20 shown in fig. 4 to 7. Then, the middle plate 21 prepared in step S810 may be placed in the mold. The plastic material used to form the rim 22 may then be heated to a molten state and the molten state plastic material injected into the cavity of the mold. After the plastic material is condensed and solidified, a frame 22 surrounding the middle plate 21 can be formed, so that the middle plate 21 and the frame 22 with an integrated structure are obtained, and the middle frame 20 is obtained. In this case, a good joining effect can be obtained between the middle plate 21 and the frame 22.

In the embodiment of the present application, the thickness of the frame 22 formed by integral injection molding is not limited herein, and in specific implementation, a person skilled in the art may determine the thickness according to the size requirement of the mobile phone 100.

In the embodiment of the present application, due to the arrangement of the shape of the inner surface of the mold, a plurality of blind grooves 221 may be formed on the first surface of the bezel 22 formed by integral injection molding. The first surface of the bezel 22 refers to a surface of the display 10 that is to be close to the mobile phone 100 after the mobile phone 100 is assembled.

S830, an identification layer 2211 is disposed at the bottom of the blind groove 221, where the identification layer 2211 is used for identifying the position of the blind groove 221 corresponding to the identification layer 2211 under the lighting condition.

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 reflection coefficient from other areas 2212 on the first surface of the frame 22 to obtain the identification layer 2211, or the bottom surface of the blind groove 221 or the other areas 2212 coated with a material having a different color from the first surface of the frame 22 may be coated with the identification layer 2211, or the bottom surface of the blind groove 221 may be provided with the identification information to obtain the identification layer 2211. The identification layer 2211 is provided to enable the blind groove 221 to be well identified under the illumination condition, so that information such as the center point coordinate of the blind groove 221 can be accurately obtained.

Specifically, in the case of polishing the bottom surface of the blind groove 221 to increase the reflection coefficient to obtain the identification layer 2211, the other areas 2212 of the first surface of the frame 22 may be subjected to matte treatment to reduce the reflection coefficient of the other areas 2212 of the first surface of the frame 22, so as to increase the difference of the reflection coefficient between the identification layer 2211 and the other areas 2212 of the first surface of the frame 22, and increase the brightness difference between the identification layer 2211 and the other areas 2212 of the first surface of the frame 22 under the illumination condition, so as to increase the recognition accuracy of the blind groove 221.

Specifically, in the case where the bottom surface of the blind groove 221 is coated with the reflective material having a different reflective coefficient from the reflective material in the 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 may be greater than the reflective coefficient in the other areas 2212 of the first surface of the frame 22, or may be less than the reflective coefficient in the other areas 2212 of the first surface of the frame 22, which is not limited herein. The embodiment of the application does not limit the types of the reflective materials, and in the specific implementation, the person skilled in the art can select the reflective materials according to actual needs.

Specifically, in the case where the bottom surface of the blind groove 221 or the other area 2212 of the first surface of the bezel 22 is coated with a material having a different color to obtain the identification layer 2211, the coated material and the material of the other area 2212 of the first surface of the bezel 22 need only have different colors, and the kind of the coating material is not limited in the embodiment of the present application, and when in specific implementation, a person skilled in the art can select according to actual needs.

Specifically, in the case that the identification layer 2211 is obtained by setting the identification information on the bottom surface of the blind groove 221, the identification information is only required to be used for uniquely identifying the blind groove corresponding to the identification information, and the type of the identification information is not limited in the embodiment of the present application, and when the embodiment is implemented, a person skilled in the art can select according to actual needs.

It should be noted that, the placement of the identification layer 2211 may also be implemented by a combination of the above several ways, for example, by a combination of the reflective material and the identification information, or by a combination of the color and the reflective material, which is not limited in the embodiment of the present application.

In some embodiments, a polishing process may also be performed on the area of the inner surface of the cavity of the mold corresponding to the identification layer 2211 of the bezel 22, such that the area of the inner surface of the cavity corresponding to the identification layer 2211 of the bezel 22 forms a shiny machined surface. And/or may be matte-finished on other areas of the inner surface of the cavity of the mold so that other areas of the inner surface of the cavity form a finished surface with lower gloss. At this time, the bright surface, i.e., the logo layer 2211 (reflective layer) may be formed at the bottom of the blind groove 221 of the first surface of the bezel 22 by injection molding in step S820. And/or a lower gloss surface may be formed in other areas 2212 of the first surface of the bezel 22.

That is, in some embodiments, step S830 may not be performed, but rather the final middle frame 20 may be integrally molded directly in step S820.

It should be noted that, other contents in the embodiments of the present application may refer to the related contents of the embodiments shown in fig. 4 to 7, and the embodiments of the present application are not described herein again.

An embodiment of the present application also provides a mold for preparing the middle frame 20, which may include an upper mold and a lower mold, which are enclosed to form a cavity, the shape of the inner surface of which is identical to the shape of the outer surface of the middle frame 20 shown in fig. 4 to 7.

In some embodiments, the inner surface of the cavity is polished in the area corresponding to the reflective layer of the bezel 22, and matte in other areas of the inner surface of the cavity. The inner surface of the cavity can be formed into a bright processing surface in the area corresponding to the reflective layer of the frame 22 by polishing treatment, and other areas of the inner surface of the cavity can be formed into a processing surface with lower glossiness by matte treatment. When the mold is used for injection molding to obtain the middle frame 20, a bright surface, namely a reflective layer, can be formed at the bottom of the blind groove 221 on the first surface of the frame 22, and other areas 2212 on the first surface of the frame 22 form surfaces with lower glossiness, so that under illumination conditions (for example, under the condition of grabbing edge recognition light), the reflective layer at the bottom of the blind groove 221 and other areas 2212 on the first surface of the frame 22 realize light-shade contrast, and the blind groove 221 (namely, a mark point) can be well recognized, thereby accurately acquiring the information such as the central point coordinate of the blind groove 221.

An embodiment of the present application also provides an electronic device that may include a center 20 as shown in fig. 4-7.

In describing embodiments of the present application, it should be noted that, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "coupled" should be construed broadly, and may be, for example, fixedly coupled, indirectly coupled through an intermediary, in communication between two elements, or in an interaction relationship between two elements. The specific meaning of the above terms in the embodiments of the present application will be understood by those of ordinary skill in the art according to specific circumstances.

The terms first, second, third, fourth and the like in the description and in the claims and in the above-described figures, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.

Finally, it should be noted that the foregoing embodiments are merely illustrative of and not limiting on the technical solutions of the embodiments of the present application, and although the embodiments of the present application have been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions described in the foregoing embodiments may be modified or some or all of the technical features may be equivalently replaced, and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A middle frame, applied to an electronic device, characterized in that the middle frame comprises a frame and a middle plate, the frame is made of a 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 a 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 is 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 is 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 other areas of the first surface are obtained by matte treatment.

5. The middle frame according to claim 1 is characterized in that 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.

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

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

8. The middle frame according to claim 7, characterized in that there are three blind grooves, 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 is characterized in that the number of the blind grooves is at least three, wherein at least one blind groove is arranged at each of the two corners of the common first side of the frame, and at least one blind groove is arranged at a non-corner position of the second side opposite to the first side.

10. A mold, characterized in that it is used to prepare a middle frame, and the mold comprises:

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 by comprising the middle frame according to any one of claims 1 to 9.