Back cover semi-finished product, back cover, back cover manufacturing method and 5G mobile phone

Abstract

The present application provides a back cover semi-finished product, a back cover, a method for manufacturing a back cover, and a 5G mobile phone. The above-mentioned back cover semi-finished product includes a hard transparent plastic cover body, a spray hardening layer, a silk screen character layer, and a film layer. One side of the hard transparent plastic cover body is formed with a molding groove, a first extended bevel groove, and a second extended bevel groove. The molding groove is connected to the first extended bevel groove and the second extended bevel groove respectively, and the other side of the hard transparent plastic cover body is formed with a hardened surface; the spray hardening layer is formed on the hardened surface; the silk screen character layer is formed on the inner wall of the molding groove; the film layer is respectively attached to the molding groove, and the first end of the film layer extends to the inner wall of the first extended bevel groove. The ends of the film layer in the first extended bevel groove and the second extended bevel groove are both located at the periphery of the CNC trimming calibration strip, which avoids the shrinkage of the film layer or the exposure of the periphery of the hard transparent plastic cover body after trimming along the CNC trimming calibration strip, thereby improving the yield rate of the back cover.

Description

Technical Field

[0001] The present invention relates to the technical field of plastic shells, and in particular to a back cover semi-finished product, a back cover, a method for manufacturing a back cover, and a 5G mobile phone. Background Art

[0002] A mobile phone includes a back cover and a front shell. The back cover is placed on the front shell to form a cavity structure for accommodating the battery. The back cover is divided into plastic back covers, metal back covers, glass back covers and ceramic back covers. With the increase in the production rate and yield rate of plastic back covers, plastic back covers are gradually sought after by mobile phone manufacturers.

[0003] However, for the plastic back cover, the surface of the traditional plastic back cover is relatively soft, that is, the hardness of the plastic back cover is relatively low; in addition, when applying the film, since the space of the groove of the plastic back cover is relatively small, the convenience of applying the film on the back cover is poor and the yield rate is low. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and to provide a back cover semi-finished product, a back cover, a method for manufacturing a back cover and a 5G mobile phone with a plastic back cover having a high surface hardness, convenient back panel film pasting and a high yield rate.

[0005] The objective of the present invention is achieved through the following technical solutions:

[0006] A back cover semi-finished product, comprising:

[0007] A hard transparent plastic cover, wherein a molding groove, a first extending inclined groove and a second extending inclined groove are formed on one side of the hard transparent plastic cover, the molding groove is connected to the first extending inclined groove and the second extending inclined groove respectively, and a hardened surface is formed on the other side of the hard transparent plastic cover;

[0008] A spray hardening layer, wherein the spray hardening layer is formed on the hardened surface;

[0009] A silk-screen character layer, wherein the silk-screen character layer is formed on the inner wall of the forming groove;

[0010] The film layer is respectively attached to the forming grooves, and the first end of the film layer extends to the inner wall of the first extended bevel groove, and the second end of the film layer extends to the inner wall of the second extended bevel groove, and the back cover semi-finished product is provided with a CNC trimming calibration strip, and the ends of the film layer in the first extended bevel groove and the second extended bevel groove are both located on the periphery of the CNC trimming calibration strip.

[0011] In one embodiment, the ends of the film layer at the first extending bevel groove and the second extending bevel groove both exceed a predetermined size of a CNC trimming calibration strip.

[0012] In one embodiment, the predetermined size is 0.3 mm to 0.5 mm.

[0013] In one embodiment, the inner wall of the first extending inclined groove has an inclination angle of 20° to 45°; and / or,

[0014] The inclination angle of the inner peripheral wall of the second extended inclined groove is 20° to 45°.

[0015] In one embodiment, the hard transparent plastic cover is an injection compression molded cover.

[0016] A back cover comprises the back cover semi-finished product described in any of the above embodiments, wherein the back cover semi-finished product is provided with a contour edge cutting hollow annular groove along the CNC trimming calibration strip, and the contour edge cutting hollow annular groove is arranged around the back cover.

[0017] In one embodiment, the periphery of the hard transparent plastic cover of the back cover is provided with a cover body contour periphery, and the cover body contour periphery is formed with connected right-angled edges and hypotenuses in a cross section along a direction perpendicular to the extension direction of the contour, and the hypotenuses extend obliquely toward the hardened surface.

[0018] In one embodiment, the angle of the hypotenuse is 30° to 40°.

[0019] A method for manufacturing a back cover, used for manufacturing the back cover described in any one of the above embodiments; the manufacturing method comprises:

[0020] The hard transparent plastic cover is formed by a compression injection molding process;

[0021] Performing a spray hardening treatment on the hardened surface of the hard transparent plastic cover to form the spray hardened layer;

[0022] Performing silk screen character processing in the molding groove of the hard transparent plastic cover body to form the silk screen character layer on the inner wall of the molding groove;

[0023] The hard transparent plastic cover body after the silk-screen character processing is subjected to film pasting processing, so that the film layers are respectively attached to the molding grooves, and the first end of the film layer extends to the inner wall of the first extending inclined groove, and the second end of the film layer extends to the inner wall of the second extending inclined groove, to obtain the back cover semi-finished product;

[0024] A hollow annular groove is cut along the contour edge of the semi-finished back cover and numerically controlled to obtain the back cover.

[0025] A 5G mobile phone, comprising the back cover described in any of the above embodiments.

[0026] Compared with the prior art, the present invention has at least the following advantages:

[0027] 1) The semi-finished back cover has a molding groove, a first extending bevel groove and a second extending bevel groove formed on one side of the hard transparent plastic cover body, the molding groove is connected to the first extending bevel groove and the second extending bevel groove respectively, the film layer is attached to the molding groove respectively, and the first end of the film layer extends to the inner wall of the first extending bevel groove, and the second end of the film layer extends to the inner wall of the second extending bevel groove, so that the film layer is better attached and positioned in the molding groove, which improves the convenience of attaching the film layer and improves the manufacturing efficiency of the back cover;

[0028] 2) The semi-finished back cover is provided with a CNC trimming calibration strip, and the ends of the film layer at the first extended bevel groove and the second extended bevel groove are both located outside the CNC trimming calibration strip, so that the finished back cover obtained by trimming along the CNC trimming calibration strip can form a curved back cover, and avoids the situation where the film layer shrinks inward or the periphery of the hard transparent plastic cover body is exposed after trimming along the CNC trimming calibration strip, thereby improving the yield rate of the back cover;

[0029] 3) Since the spray hardening layer is formed on the hardened surface, the surface hardness of the hard transparent plastic cover is higher, thus solving the problem of low hardness of the plastic back cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 This is a schematic structural diagram of a semi-finished back cover in one embodiment;

[0032] Figure 2 for Figure 1 A schematic structural diagram of the back cover semi-finished product from another perspective;

[0033] Figure 3 for Figure 2 A structural schematic diagram of the semi-finished back cover from another viewing angle;

[0034] Figure 4 for Figure 3 A cross-sectional view of the semi-finished back cover shown;

[0035] Figure 5 for Figure 4 A partial enlarged view shown in the middle A;

[0036] Figure 6is a schematic structural diagram of a back cover in an embodiment;

[0037] Figure 7 for Figure 6 A partial enlarged schematic diagram of the back cover shown;

[0038] Figure 8 for Figure 7 An enlarged view of the partial cross-section along line BB of the back cover shown. DETAILED DESCRIPTION

[0039] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly understood.

[0040] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0042] The present application also provides a back cover semi-finished product including a hard transparent plastic cover body, a spray hardening layer, a silk screen character layer and a film layer, one side of the hard transparent plastic cover body is formed with a molding groove, a first extended bevel groove and a second extended bevel groove, the molding groove is respectively connected with the first extended bevel groove and the second extended bevel groove, and the other side of the hard transparent plastic cover body is formed with a hardened surface; the spray hardening layer is molded on the hardened surface; the silk screen character layer is molded on the inner wall of the molding groove; the film layers are respectively attached to the molding grooves, and the first end of the film layer extends to the inner wall of the first extended bevel groove, and the second end of the film layer extends to the inner wall of the second extended bevel groove, the back cover semi-finished product is provided with a CNC trimming calibration strip, and the ends of the film layer in the first extended bevel groove and the second extended bevel groove are both located on the periphery of the CNC trimming calibration strip.

[0043] The above-mentioned back cover semi-finished product has a molding groove, a first extending bevel groove and a second extending bevel groove formed on one side of the hard transparent plastic cover body, the molding groove is respectively connected to the first extending bevel groove and the second extending bevel groove, the film layers are respectively attached to the molding groove, and the first end of the film layer extends to the inner wall of the first extending bevel groove, and the second end of the film layer extends to the inner wall of the second extending bevel groove, so that the film layer is better attached and positioned in the molding groove, which improves the convenience of attaching the film layer and improves the manufacturing efficiency of the back cover at the same time; the back cover semi-finished product A CNC trimming calibration strip is provided, and the ends of the film layer in the first extended bevel groove and the second extended bevel groove are both located on the periphery of the CNC trimming calibration strip, so that the finished back cover obtained by trimming along the CNC trimming calibration strip can form a curved back cover, and after trimming along the CNC trimming calibration strip, there is a situation where the film layer shrinks inward or the periphery of the hard transparent plastic cover body is exposed, thereby improving the yield of the back cover; since the spray hardening layer is formed on the hardened surface, the surface hardness of the hard transparent plastic cover body is higher, thereby solving the problem of low hardness of the plastic back cover.

[0044] In order to better understand the technical solution of the present application, the technical solution of the present application is further explained below:

[0045] like Figures 1 to 5 As shown, a back cover semi-finished product 10 of an embodiment includes a hard transparent plastic cover body 100, a spray hardening layer 200, a silk screen character layer 300 and a film layer 400. A molding groove 110, a first extending inclined groove 120 and a second extending inclined groove 130 are formed on one side of the hard transparent plastic cover body 100, and the molding groove 110 is respectively connected with the first extending inclined groove 120 and the second extending inclined groove 130. A hardened surface 103 is formed on the other side of the hard transparent plastic cover body 100; the spray hardening layer 200 is formed on the hardened surface. The silk-screen character layer 300 is formed on the inner wall of the molding groove 110; the film layer 400 is respectively attached to the molding groove 110, and the first end of the film layer 400 extends to the inner wall of the first extended bevel groove 120, and the second end of the film layer 400 extends to the inner wall of the second extended bevel groove 130, so that the film layer 400 is respectively attached to the inner walls of the molding groove 110, the first extended bevel groove 120 and the second extended bevel groove 130.

[0046] Furthermore, the back cover semi-finished product 10 is provided with a CNC trimming calibration strip 12, and the ends of the film layer 400 at the first extended bevel groove 120 and the second extended bevel groove 130 are both located on the periphery of the CNC trimming calibration strip 12, that is, the ends of the film layer 400 at the first extended bevel groove 120 and the second extended bevel groove 130 are both beyond the CNC trimming calibration strip 12, thereby avoiding the situation where the film layer 400 shrinks inward or the periphery of the hard transparent plastic cover body 100 is exposed after trimming along the CNC trimming calibration strip 12.

[0047] The above-mentioned back cover semi-finished product 10, since a molding groove 110, a first extending bevel groove 120 and a second extending bevel groove 130 are formed on one side of the hard transparent plastic cover body 100, the molding groove 110 is respectively connected with the first extending bevel groove 120 and the second extending bevel groove 130, and the film layer 400 is respectively attached to the molding groove 110, and the first end of the film layer 400 extends to the inner wall of the first extending bevel groove 120, and the second end of the film layer 400 extends to the inner wall of the second extending bevel groove 130, so that the film layer 400 is better attached and positioned in the molding groove 110, the attachment convenience of the film layer 400 is improved, and the manufacturing efficiency of the back cover is improved. rate; the back cover semi-finished product 10 is provided with a CNC trimming calibration strip 12, and the ends of the film layer 400 in the first extended bevel groove 120 and the second extended bevel groove 130 are both located on the periphery of the CNC trimming calibration strip 12, so that the finished back cover obtained by trimming along the CNC trimming calibration strip 12 can form a curved back cover, and avoids the situation where the film layer 400 shrinks or the periphery of the hard transparent plastic cover body 100 is exposed after the trimming along the CNC trimming calibration strip 12, thereby improving the yield rate of the back cover; because the spray hardening layer 200 is formed on the hardened surface, the surface hardness of the hard transparent plastic cover body 100 is higher, thereby solving the problem of low hardness of the plastic back cover.

[0048] In one of the embodiments, the CNC trimming calibration strip 12 can be used for trimming processing when the back cover is trimmed and formed, that is, it can be used as a reference for the trimming path when the CNC trims the back cover semi-finished product 10 to form the back cover, thereby improving the yield of the back cover.

[0049] like Figure 3 As shown, in one embodiment, the ends of the film layer 400 at the first extending bevel groove 120 and the second extending bevel groove 130 are both beyond the predetermined size of the CNC trimming calibration strip 12. In this embodiment, the predetermined size is 0.3mm to 0.5mm, so that the film layer 400 of the finished back cover is better attached to the surface of the hard transparent plastic cover body 100, thereby improving the qualified rate of the finished back cover.

[0050] In one embodiment, the inner wall of the first extended bevel groove 120 has an inclination angle of 20° to 45°; and / or the inner wall of the second extended bevel groove 130 has an inclination angle of 20° to 45°, so that the first end of the film layer 400 is better extended and attached to the inner wall of the first extended bevel groove 120, and the second end of the film layer 400 is better extended and attached to the inner wall of the second extended bevel groove 130, while improving the convenience of attaching the film layer 400, thereby improving the manufacturing efficiency of the back cover, and the hard transparent plastic cover body 100 is easy to demold during injection molding.

[0051] In one embodiment, the hard transparent plastic cover 100 is an injection compression molded cover, so that the hard transparent plastic cover 100 can be manufactured and molded better, and the manufacturing qualification rate of the hard transparent plastic cover 100 is improved.

[0052] Furthermore, the hard transparent plastic cover body 100 is also formed with an attachment positioning groove, which is respectively connected to the molding groove 110, the first extended bevel groove 120 and the second extended bevel groove 130. The film layer 400 is located in the attachment positioning groove and is attached and connected to the hard transparent plastic cover body 100, so that the film layer 400 is better attached to the hard transparent plastic cover body 100.

[0053] like Figures 1 to 3 , Figure 6As shown, the present application also provides a back cover 30, including the back cover semi-finished product 10 described in any of the above embodiments, the back cover semi-finished product 10 is provided with a contour edge cutting hollow annular groove along the CNC trimming calibration strip 12, and the contour edge cutting hollow annular groove is provided around the back cover. In one embodiment, the back cover semi-finished product 10 includes a hard transparent plastic cover body 100, a spray hardening layer 200, a silk screen character layer 300 and a film layer 400. A molding groove 110, a first extending bevel groove 120 and a second extending bevel groove 130 are formed on one side of the hard transparent plastic cover body 100, and the molding groove 110 is connected to the first extending bevel groove 120 and the second extending bevel groove 130 respectively. A hardened surface is formed on the other side of the hard transparent plastic cover body 100; the spray hardening layer 200 is formed on the hardened surface. The silk-screen character layer 300 is formed on the inner wall of the molding groove 110; the film layer 400 is respectively attached to the molding groove 110, and the first end of the film layer 400 extends to the inner wall of the first extended bevel groove 120, and the second end of the film layer 400 extends to the inner wall of the second extended bevel groove 130, so that the film layer 400 is respectively attached to the inner walls of the molding groove 110, the first extended bevel groove 120 and the second extended bevel groove 130. The back cover semi-finished product 10 is provided with a CNC trimming calibration strip 12, and the ends of the film layer 400 at the first extended bevel groove 120 and the second extended bevel groove 130 are both located outside the CNC trimming calibration strip 12, that is, the ends of the film layer 400 at the first extended bevel groove 120 and the second extended bevel groove 130 are both beyond the CNC trimming calibration strip 12, so as to avoid the film layer 400 shrinking inward or the peripheral edge of the hard transparent plastic cover body 100 being exposed after trimming along the CNC trimming calibration strip 12. In this embodiment, the back cover semi-finished product 10 is provided with a contour edge cutting hollow annular groove along the CNC trimming calibration strip 12, and the contour edge cutting hollow annular groove is arranged around the back cover, that is, the back cover is a solid body surrounded by the contour edge cutting hollow annular groove, and the edge material outside the contour edge cutting hollow annular groove is removed.

[0054] For the back cover semi-finished product 10 before the back cover is formed by trimming, since a molding groove 110, a first extending bevel groove 120 and a second extending bevel groove 130 are formed on one side of the hard transparent plastic cover body 100, the molding groove 110 is respectively connected with the first extending bevel groove 120 and the second extending bevel groove 130, and the film layer 400 is respectively attached to the molding groove 110, and the first end of the film layer 400 extends to the inner wall of the first extending bevel groove 120, and the second end of the film layer 400 extends to the inner wall of the second extending bevel groove 130, so that the film layer 400 is better attached and positioned in the molding groove 110, thereby improving the convenience of attaching the film layer 400. At the same time, the manufacturing efficiency of the back cover is improved; the semi-finished back cover 10 is provided with a CNC trimming calibration strip 12, and the ends of the film layer 400 in the first extended bevel groove 120 and the second extended bevel groove 130 are both located on the periphery of the CNC trimming calibration strip 12, so that the finished back cover obtained by trimming along the CNC trimming calibration strip 12 can form a curved back cover, and after the trimming along the CNC trimming calibration strip 12, there is a situation where the film layer 400 shrinks inward or the periphery of the hard transparent plastic cover body 100 is exposed, thereby improving the yield of the back cover; because the spray hardening layer 200 is formed on the hardened surface, the surface hardness of the hard transparent plastic cover body 100 is higher, thereby solving the problem of low hardness of the plastic back cover.

[0055] like Figure 6 and Figure 7 As shown, in one embodiment, the periphery of the hard transparent plastic cover 100 of the back cover 30 is provided with a cover contour periphery 102, and see Figure 8 The periphery of the cover body contour is formed with a connected right-angled edge 1022 and a beveled edge 1024 along a cross section perpendicular to the contour extension direction, that is, the periphery of the cover body contour is beveled, and the beveled edge extends obliquely toward the hardened surface, thereby solving the problem of serious slight vibration marks in the processing of the periphery of the cover body contour, facilitating the processing of the periphery of the cover body contour at the periphery of the back cover, and at the same time improving the processing rate of the periphery of the cover body contour at the periphery of the back cover.

[0056] like Figure 8 As shown, in one embodiment, the angle of the bevel is 30°~40°, that is, the bevel angle of the periphery of the cover body contour is 30°~40°. In this embodiment, the angle of the bevel is 35°, which avoids the problem that the cross section of the periphery contour of the back cover is too sharp and easy to be lost and the processing is difficult, and also avoids the problem that the periphery of the cover body contour of the periphery of the back cover is all beveled and difficult to control the processing, so that the angle of the bevel is more moderate, so as to perform edge processing on the periphery of the cover body contour of the back cover, improve the yield rate of the back cover, especially the angle setting of the bevel at the four corners of the back cover, which is conducive to CNC processing and reduces the problem of missing bevels.

[0057] Furthermore, an integrated antenna layer is formed on one side of the back cover on the film layer 400. The integrated antenna layer has partial antennas and RF functions such as NFC, which reduces the difficulty of RF development to better meet the needs of multiple RF standards and functions in the 5G era. Furthermore, the integrated antenna layer includes a first wiring contact block, a second wiring contact block and a ring antenna strip. The ring antenna strip is arranged in a rectangular shape. The first wiring contact block and the second wiring contact block are respectively connected to the two ends of the ring antenna strip. The first wiring contact block and the second wiring contact block are in contact with the antenna conductive contact strip on the back of the front shell to realize the RF transmission of the antenna.

[0058] The present application also provides a 5G mobile phone, comprising a back cover as described in any of the above embodiments. Furthermore, the back cover comprises a back cover semi-finished product 10, and the back cover semi-finished product 10 is provided with a contour edge cutting hollow annular groove along the CNC trimming calibration strip 12, and the contour edge cutting hollow annular groove is arranged around the back cover. In one embodiment, the back cover semi-finished product 10 comprises a hard transparent plastic cover body 100, a spray hardening layer 200, a silk screen character layer 300 and a film layer 400. A molding groove 110, a first extended bevel groove 120 and a second extended bevel groove 130 are formed on one side of the hard transparent plastic cover body 100, and the molding groove 110 is connected to the first extended bevel groove 120 and the second extended bevel groove 130 respectively. A hardened surface is formed on the other side of the hard transparent plastic cover body 100; the spray hardening layer 200 is formed on the hardened surface. The silk-screen character layer 300 is formed on the inner wall of the molding groove 110; the film layer 400 is respectively attached to the molding groove 110, and the first end of the film layer 400 extends to the inner wall of the first extended bevel groove 120, and the second end of the film layer 400 extends to the inner wall of the second extended bevel groove 130, so that the film layer 400 is respectively attached to the inner walls of the molding groove 110, the first extended bevel groove 120 and the second extended bevel groove 130. The semi-finished back cover 10 is provided with a CNC trimming calibration strip 12, and the ends of the film layer 400 at the first extended bevel groove 120 and the second extended bevel groove 130 are both located on the periphery of the CNC trimming calibration strip 12, that is, the ends of the film layer 400 at the first extended bevel groove 120 and the second extended bevel groove 130 are both beyond the CNC trimming calibration strip 12, so as to avoid the situation in which the film layer 400 shrinks or the periphery of the hard transparent plastic cover body 100 is exposed after trimming along the CNC trimming calibration strip 12.

[0059] For the above-mentioned 5G mobile phone, for the back cover semi-finished product 10 before the back cover is formed by trimming, since a molding groove 110, a first extended bevel groove 120 and a second extended bevel groove 130 are formed on one side of the hard transparent plastic cover body 100, the molding groove 110 is respectively connected with the first extended bevel groove 120 and the second extended bevel groove 130, and the film layer 400 is respectively attached to the molding groove 110, and the first end of the film layer 400 extends to the inner wall of the first extended bevel groove 120, and the second end of the film layer 400 extends to the inner wall of the second extended bevel groove 130, so that the film layer 400 is better attached and positioned in the molding groove 110, thereby improving the convenience of attaching the film layer 400. , and at the same time improves the manufacturing efficiency of the back cover; the back cover semi-finished product 10 is provided with a CNC trimming calibration strip 12, and the ends of the film layer 400 in the first extended bevel groove 120 and the second extended bevel groove 130 are both located on the periphery of the CNC trimming calibration strip 12, so that the finished back cover obtained by trimming along the CNC trimming calibration strip 12 can form a curved back cover, and after the trimming along the CNC trimming calibration strip 12, there is a situation where the film layer 400 shrinks inward or the periphery of the hard transparent plastic cover body 100 is exposed, thereby improving the yield of the back cover; because the spray hardening layer 200 is formed on the hardened surface, the surface hardness of the hard transparent plastic cover body 100 is higher, thereby solving the problem of low hardness of the plastic back cover.

[0060] Furthermore, the 5G mobile phone also includes a front shell, and the back cover is covered on the front shell to form a cavity structure for accommodating the battery. Furthermore, an integrated antenna layer is formed on one side of the back cover on the film layer 400, and the integrated antenna layer has radio frequency functions such as partial antennas and NFC, which reduces the difficulty of radio frequency development to better meet the needs of coexistence of multiple radio frequency standards and functions in the 5G era. Furthermore, the integrated antenna layer includes a first wiring contact block, a second wiring contact block and a ring-shaped antenna strip, and the ring-shaped antenna strip is arranged in a rectangular shape. The first wiring contact block and the second wiring contact block are respectively connected to the two ends of the ring-shaped antenna strip, and the first wiring contact block and the second wiring contact block are in contact with the antenna conductive contact strip on the back of the front shell to realize the radio frequency transmission of the antenna.

[0061] The present application also provides a method for manufacturing a back cover, which is used to manufacture the back cover described in any of the above embodiments; further, the manufacturing method includes part or all of the following steps:

[0062] S101, forming the hard transparent plastic cover 100 by compression injection molding;

[0063] In this embodiment, the hard transparent plastic cover 100 is formed by a compression injection molding process, which improves the efficiency of the hard transparent plastic cover 100 and makes the qualified rate of the hard transparent plastic cover 100 higher. Specifically, the compression injection molding process is an injection compression molding process. The injection compression molding process is a combined molding technology of injection molding and compression molding. The process is to inject a certain amount of molten plastic into a mold cavity with a compression gap reserved. The secondary mold closing action will also complete the uniform compression of the melt, and demolding after cooling and solidification.

[0064] S103 , performing spray hardening treatment on the hardened surface of the hard transparent plastic cover 100 to form the spray hardened layer 200 .

[0065] In this embodiment, a spray hardening treatment is performed on the hardened surface of the hard transparent plastic cover 100 to form the spray hardened layer 200, so that the hardened surface of the hard transparent plastic cover 100 can be hardened on one side. Furthermore, the step of spray hardening the hardened surface of the hard transparent plastic cover 100 is specifically: spray hardening is performed on the hardened surface of the hard transparent plastic cover 100 by a spraying process.

[0066] S105 , performing silk screen printing processing in the molding groove 110 of the hard transparent plastic cover 100 to form the silk screen printing character layer 300 on the inner wall of the molding groove 110 .

[0067] In this embodiment, a silk screen character processing is performed in the molding groove 110 of the hard transparent plastic cover 100 to form the silk screen character layer 300 on the inner wall of the molding groove 110. Further, the step of performing silk screen character processing in the molding groove 110 of the hard transparent plastic cover 100 includes: forming an icon layer by a silk screen process; forming a glue transfer texture layer by UV transfer; forming a coating layer by a coating process, and completing the silk screen character layer 300 operation.

[0068] S107, perform film pasting treatment on the hard transparent plastic cover body 100 after the silk-screen character processing, so that the film layer 400 is respectively attached to the molding groove 110, and the first end of the film layer 400 extends to the inner wall of the first extended bevel groove 120, and the second end of the film layer 400 extends to the inner wall of the second extended bevel groove 130, to obtain the back cover semi-finished product 10.

[0069] In this embodiment, the hard transparent plastic cover body 100 after the silk-screen character processing is subjected to a film treatment, so that the film layer 400 is respectively attached to the molding groove 110, and the first end of the film layer 400 extends to the inner wall of the first extended bevel groove 120, and the second end of the film layer 400 extends to the inner wall of the second extended bevel groove 130, thereby obtaining the back cover semi-finished product 10.

[0070] S109, cutting a hollow annular groove along the contour edge of the back cover semi-finished product 10 and performing CNC machining to obtain the back cover.

[0071] In this embodiment, the step of cutting a hollow annular groove along the contour edge of the back cover semi-finished product 10 for CNC machining is specifically as follows: using CNC machining to cut a hollow annular groove along the contour edge of the back cover semi-finished product 10 for CNC machining to obtain the back cover.

[0072] In the above-mentioned method for manufacturing the back cover, for the back cover semi-finished product 10 before the back cover is formed by trimming, since a molding groove 110, a first extending bevel groove 120 and a second extending bevel groove 130 are formed on one side of the hard transparent plastic cover body 100, the molding groove 110 is respectively connected with the first extending bevel groove 120 and the second extending bevel groove 130, and the film layer 400 is respectively attached to the molding groove 110, and the first end of the film layer 400 extends to the inner wall of the first extending bevel groove 120, and the second end of the film layer 400 extends to the inner wall of the second extending bevel groove 130, so that the film layer 400 is better attached and positioned in the molding groove 110, thereby improving the convenience of attaching the film layer 400 and improving the back cover. Manufacturing efficiency: The semi-finished back cover 10 is provided with a CNC trimming calibration strip 12, and the ends of the film layer 400 at the first extended bevel groove 120 and the second extended bevel groove 130 are both located on the periphery of the CNC trimming calibration strip 12, so that the finished back cover obtained by trimming along the CNC trimming calibration strip 12 can form a curved back cover, and after the trimming along the CNC trimming calibration strip 12, there is a situation where the film layer 400 shrinks inward or the periphery of the hard transparent plastic cover body 100 is exposed, thereby improving the yield of the back cover; since the spray hardening layer 200 is formed on the hardened surface, the surface hardness of the hard transparent plastic cover body 100 is higher, which solves the problem of low hardness of the plastic back cover and at the same time makes the back cover have better transparency and impact resistance.

[0073] Furthermore, the steps of molding the hard transparent plastic cover 100 by compression injection molding process include: firstly, performing the mold closing operation of the upper mold and the lower mold until there is a predetermined distance between the upper mold and the lower mold, and there is an injection molding cavity between the upper mold and the lower mold; then injecting a predetermined volume of injection molding slurry into the injection molding cavity; then completely closing the upper mold and the lower mold to form the required mold closing thickness; then performing mold opening and ejection operation; finally performing high temperature cutting operation to remove excess water outlet and other waste materials, completing the molding operation of the hard transparent plastic cover 100, so that the size of the molded hard transparent plastic cover 100 is relatively stable, and the thickness of each position of the hard transparent plastic cover 100 is relatively uniform. In this embodiment, each time the compression injection molding process is performed, two hard transparent plastic covers 100 can be molded at the same time, which improves the molding efficiency of a single hard transparent plastic cover 100.

[0074] Furthermore, the maximum clamping force between the upper mold and the lower mold is 1500 kN to 1800 kN, so that the upper mold and the lower mold can better mold the hard transparent plastic cover 100, thereby making the hard transparent plastic cover 100 have a better molding effect.

[0075] Furthermore, the ejection force of the ejector pin for mold opening and ejection operation is 20kN to 22kN, and the ejector pin speed is 320mm / s to 340mm / s, so as to better eject the semi-finished hard transparent plastic cover 100 and avoid the problem of damage to the semi-finished hard transparent plastic cover 100.

[0076] Furthermore, before the step of injecting a predetermined volume of molding slurry into the molding cavity, the step of molding the hard transparent plastic cover 100 by compression injection molding process also includes: vacuum drying the molding slurry to reduce the amount of air in the molding slurry and make the molding slurry have better fluidity so as to be better injected into the molding cavity.

[0077] Furthermore, the predetermined volume is equal to 80% to 90% of the volume of the injection cavity. In this embodiment, the predetermined volume is equal to 85% of the volume of the injection cavity, so as to better mold the hard transparent plastic cover 100.

[0078] Furthermore, the step of performing a film-laminating treatment on the hard transparent plastic cover body 100 after the silk-screen character processing includes: first, performing a cleaning operation on the hard transparent plastic cover body 100 after the silk-screen character processing to remove impurities on the surface of the hard transparent plastic cover body 100; then, performing a curved surface vacuum adsorption film-laminating operation on the cleaned hard transparent plastic cover body 100, so that the film layer 400 is better adhered to the surface of the hard transparent plastic cover body 100, avoiding the problem of bulges and a large number of bubbles in the film layer 400; then, performing an air pressure defoaming treatment operation on the hard transparent plastic cover body 100 after the film-laminating operation to remove air bubbles between the film layer 400 and the hard transparent plastic cover body 100, thereby making the film layer 400 reliably adhered to the inner surface of the hard transparent plastic cover body 100. In this embodiment, the step of performing a curved surface vacuum adsorption film-sticking operation on the cleaned hard transparent plastic cover 100 is specifically: performing a 3D curved surface vacuum adsorption film-sticking operation on the cleaned hard transparent plastic cover 100. Further, after the step of performing an air pressure defoaming operation on the hard transparent plastic cover 100 after the film-sticking operation, the step of performing a film-sticking operation on the hard transparent plastic cover 100 after the silk-screen character processing also includes: performing a rolling operation on one side of the film layer 400 of the hard transparent plastic cover 100 subjected to the air pressure defoaming operation, so that the film layer 400 is better attached to the hard transparent plastic cover 100.

[0079] Compared with the prior art, the present invention has at least the following advantages:

[0080] 1) The above-mentioned back cover semi-finished product 10, since a molding groove 110, a first extending bevel groove 120 and a second extending bevel groove 130 are formed on one side of the hard transparent plastic cover body 100, the molding groove 110 is respectively connected with the first extending bevel groove 120 and the second extending bevel groove 130, and the film layer 400 is respectively attached to the molding groove 110, and the first end of the film layer 400 extends to the inner wall of the first extending bevel groove 120, and the second end of the film layer 400 extends to the inner wall of the second extending bevel groove 130, so that the film layer 400 is better attached and positioned in the molding groove 110, the attachment convenience of the film layer 400 is improved, and the manufacturing efficiency of the back cover is improved;

[0081] 2) The back cover semi-finished product 10 is provided with a CNC trimming calibration strip 12, and the ends of the film layer 400 at the first extended bevel groove 120 and the second extended bevel groove 130 are both located on the periphery of the CNC trimming calibration strip 12, so that the back cover finished product obtained by trimming along the CNC trimming calibration strip 12 can form a curved back cover, and avoids the situation that the film layer 400 shrinks inward or the periphery of the hard transparent plastic cover body 100 is exposed after trimming along the CNC trimming calibration strip 12, thereby improving the yield rate of the back cover;

[0082] 3) Since the spray hardening layer 200 is formed on the hardened surface, the surface hardness of the hard transparent plastic cover 100 is higher, thus solving the problem of low hardness of the plastic back cover.

[0083] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A semi-finished back cover product, characterized in that: include: A hard transparent plastic cover, wherein a molding groove, a first extending inclined groove and a second extending inclined groove are formed on one side of the hard transparent plastic cover, the molding groove is respectively connected with the first extending inclined groove and the second extending inclined groove, the molding groove is located in the middle of the hard transparent plastic cover, the first extending inclined groove and the second extending inclined groove are respectively located on both sides of the longitudinal extension direction of the molding groove, and the other side of the hard transparent plastic cover is formed with a hardened surface; A spray hardening layer, wherein the spray hardening layer is formed on the hardened surface; A silk-screen character layer, wherein the silk-screen character layer is formed on the inner wall of the forming groove; The film layer is respectively attached to the forming grooves, and the first end of the film layer extends to the inner wall of the first extended bevel groove, and the second end of the film layer extends to the inner wall of the second extended bevel groove. The back cover semi-finished product is provided with a CNC trimming calibration strip, and the ends of the film layer in the first extended bevel groove and the second extended bevel groove are both located on the periphery of the CNC trimming calibration strip. The CNC trimming calibration strip is used for trimming processing when the back cover is trimmed and formed.

2. The semi-finished back cover product according to claim 1, characterized in that: The ends of the film layer at the first extending bevel groove and the second extending bevel groove both exceed the predetermined size of the numerical control trimming calibration strip.

3. The semi-finished back cover product according to claim 2, characterized in that: The predetermined size is 0.3 mm to 0.5 mm.

4. The semi-finished back cover product according to claim 1, characterized in that: The inclination angle of the inner peripheral wall of the first extended inclined groove is 20° to 45°; and / or, The inclination angle of the inner peripheral wall of the second extended inclined groove is 20°~45°.

5. The semi-finished back cover product according to claim 1, characterized in that: The hard transparent plastic cover is an injection compression molded cover.

6. A back cover, characterized in that: The back cover semi-finished product comprises the back cover semi-finished product according to any one of claims 1 to 5, wherein the back cover semi-finished product is provided with a contour edge cut hollow annular groove along the CNC trimming calibration strip, and the contour edge cut hollow annular groove is provided around the back cover.

7. The back cover according to claim 6, characterized in that: The periphery of the hard transparent plastic cover of the back cover is provided with a cover contour periphery, and the cross section of the cover contour periphery along a direction perpendicular to the extension direction of the contour forms connected right-angled sides and hypotenuses, and the hypotenuses extend obliquely toward the hardened surface.

8. The back cover according to claim 7, characterized in that: The angle of the hypotenuse is 30°~40°.

9. A method for manufacturing a back cover, characterized in that: Used to manufacture the back cover according to any one of claims 6 to 8; the manufacturing method comprises: The hard transparent plastic cover is formed by a compression injection molding process; Performing a spray hardening treatment on the hardened surface of the hard transparent plastic cover to form the spray hardened layer; Performing silk screen character processing in the molding groove of the hard transparent plastic cover body to form the silk screen character layer on the inner wall of the molding groove; The hard transparent plastic cover body after the silk-screen character processing is subjected to film pasting processing, so that the film layers are respectively attached to the molding grooves, and the first end of the film layer extends to the inner wall of the first extending inclined groove, and the second end of the film layer extends to the inner wall of the second extending inclined groove, to obtain the back cover semi-finished product; A hollow annular groove is cut along the contour edge of the semi-finished back cover and numerically controlled to obtain the back cover.

10. A 5G mobile phone, characterized in that: Comprising the back cover according to any one of claims 6-8.

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