CN107231772A - Mobile terminal rear case, manufacturing method of mobile terminal rear case, and mobile terminal - Google Patents

Abstract

The invention relates to a mobile terminal rear shell, a manufacturing method of the mobile terminal rear shell and a mobile terminal. The mobile terminal rear shell comprises a shell body, a partition strip and a decoration layer. The shell is provided with an outer surface and an inner surface, and a gap is formed in the shell and penetrates through the outer surface and the inner surface; the partition strip is embedded in the gap and fixedly connected with the shell; the decorative layer covers one side of the partition strip close to the outer surface and is fixedly connected with the shell; the color difference value delta E between the color of the partition strip covered by the decorative layer and the color of the outer surface is 0-2.5. Above-mentioned mobile terminal backshell sets up the decorative layer through the one side that is close to the surface at the partition strip for the colour of the partition strip that is covered by the decorative layer is 0 ~ 2.5 with the range of the colour difference value delta E of the colour of the surface of casing, just can make the approximate integrated into one piece of outward appearance of mobile terminal backshell, thereby has promoted the wholeness and the aesthetic property of mobile terminal backshell.

Description

Mobile terminal rear case, manufacturing method of mobile terminal rear case, and mobile terminal

technical field

The present invention relates to the technical field of electronic equipment, in particular to a mobile terminal rear case, a method for manufacturing the mobile terminal rear case, and a mobile terminal.

Background technique

The back shell of a mobile terminal (mobile phone, tablet, etc.) is generally made of a metal material. In order to prevent the metal back shell from shielding the signal transmission or reception of the mobile terminal, it is necessary to open a gap on the back shell. The gap is generally filled with plastic material. The metal part of the back shell can generally be surface treated (such as anodic oxidation treatment) to improve the performance and aesthetics of the back shell, but the plastic part in the gap cannot be directly surface-treated, resulting in the metal part of the back shell and the plastic The color of some parts is inconsistent, which affects the integrity of the appearance of the back shell.

Contents of the invention

Based on this, it is necessary to provide a mobile terminal rear case, a method for manufacturing the mobile terminal rear case, and a mobile terminal to solve the problem that the color of the metal part and the plastic part of the rear case of the mobile terminal are inconsistent.

A mobile terminal rear shell, comprising:

A casing, the casing is made of metal, the casing has an outer surface and an inner surface oppositely arranged, and a gap is opened on the casing, and the gap runs through the outer surface and the inner surface;

A partition strip, the material of the partition strip is an insulating material, the partition strip is embedded in the gap and fixedly connected with the housing; and

A decorative layer, covering the side of the partition bar close to the outer surface and fixedly connected to the housing; the color difference between the color of the partition bar covered by the decorative layer and the color of the outer surface The value ΔE ranges from 0 to 2.5.

In one of the embodiments, the gap includes a first receiving groove close to the inner surface and a second receiving groove close to the outer surface, the first receiving groove and the second receiving groove Communication; the partition bar is located in the first accommodation groove, the decoration layer is located in the second accommodation groove, and the surface of the decoration layer close to the outer surface is flush with the outer surface.

In one of the embodiments, the decoration layer also covers the outer surface of the casing.

In one of the embodiments, the material of the partition strip is plastic; the decorative layer includes an adhesive layer and a paint layer, and the adhesive layer is adhered to the side of the partition strip close to the outer surface , the color paint layer adheres to the side of the adhesive layer close to the outer surface, the color difference ΔE between the color of the partition strip covered by the color paint layer and the color of the outer surface The range is 0 to 2.5.

In one embodiment, the decoration layer further includes a strengthening layer, the strengthening layer is adhered to the side of the colored paint layer close to the outer surface, and the material of the strengthening layer is a transparent material.

In one embodiment, the thickness of the decoration layer is 7 microns to 50 microns.

In one embodiment, the thickness of the decoration layer is 8 microns to 45 microns.

In one embodiment, the adhesive layer has a thickness of 3 microns to 9 microns.

In one embodiment, the adhesive layer has a thickness of 7.5 microns to 8.5 microns.

In one embodiment, the thickness of the color paint layer is 3 microns to 9 microns.

In one embodiment, the thickness of the color paint layer is 7.5 microns-8.5 microns.

A method for manufacturing a mobile terminal rear case, comprising the steps of:

processing a decorative layer on a film carrier to produce a foil;

The film is adhered to the side of the outer surface of the partition bar close to the rear shell of the mobile terminal, so that the decorative layer is fixedly connected to the housing, and the color of the partition bar covered by the decorative layer is consistent with the The color difference value ΔE of the color of the outer surface ranges from 0 to 2.5; and

The membrane carrier is torn off.

In one of the embodiments, the step of coating the decorative layer on the film carrier to prepare the film comprises:

Coating a colored paint layer on the film carrier, the thickness of the colored paint layer is 3 microns to 9 microns; and

An adhesive layer is coated on the surface of the color paint layer facing away from the film carrier, and the thickness of the adhesive layer is 3 microns to 9 microns.

In one of the embodiments, before the step of coating the color paint layer on the surface of the film carrier, it also includes:

A strengthening layer is coated on the surface of the film carrier, so that the strengthening layer is located between the color paint layer and the film carrier, and the thickness of the strengthening layer is 3 microns to 9 microns.

In one of the embodiments, the manufacturing method of the mobile terminal rear case further includes the following steps:

A second accommodating groove is provided on the outer surface, the second accommodating groove communicates with the first accommodating groove of the rear case of the mobile terminal, and the extension direction of the second accommodating groove is the same as that of the first accommodating groove. The extension directions of the accommodating grooves are the same.

In one of the embodiments, the width of the decorative layer matches the width of the second accommodating groove, the decorative layer is located in the second accommodating groove, and the decorative layer is close to the outer surface The surface is flush with the outer surface.

In one embodiment, the shape of the sticking film matches the shape of the outer surface, the decorative layer is also covered on the outer surface, and the decorative layer is fixedly connected to the housing.

A mobile terminal includes a screen assembly and the above-mentioned mobile terminal rear case, and the mobile terminal rear case is fixedly connected with the screen assembly.

A mobile terminal includes a screen assembly and a mobile terminal rear case manufactured by the above method for manufacturing a mobile terminal rear case, and the mobile terminal rear case is fixedly connected to the screen assembly.

In the mobile terminal, the manufacturing method of the mobile terminal rear case and the mobile terminal rear case, the partition bar of the mobile terminal rear case is embedded in the gap, and a decorative layer is provided on the side of the partition bar close to the outer surface of the housing, and the The range of color difference ΔE between the surface color of the partition strip covered with the decorative layer and the color of the outer surface of the casing is 0 to 2.5, so that the color of the partition strip covered with the decorative layer and the outer surface of the casing can be Color tends to be consistent. When the partition bar is made of plastic material, by covering the plastic part with a decorative layer, there is no obvious color difference between the plastic part and the metal part of the mobile terminal rear case, so that the appearance of the mobile terminal rear case is almost integrally formed, thereby improving It improves the integrity and aesthetics of the mobile terminal rear case.

Description of drawings

Fig. 1 is a front view of a mobile terminal rear case in an embodiment;

Fig. 2 is the front view of the rear shell of the mobile terminal in another embodiment;

Fig. 3 is a partial sectional view along A-A of the rear case of the mobile terminal shown in Fig. 1;

FIG. 4 is another partial cross-sectional view along A-A of the rear case of the mobile terminal shown in FIG. 1;

Fig. 5 is a sectional view of pasting film in an embodiment;

Fig. 6 is a manufacturing flow chart of the mobile terminal rear case shown in Fig. 1;

FIG. 7 is a flowchart of step S100 shown in FIG. 6;

Fig. 8 is a perspective view of a mobile terminal in an embodiment.

detailed description

In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the associated drawings. Preferred embodiments of the invention are shown in the accompanying drawings. However, the present invention can be embodied in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the understanding of the disclosure of the present invention more thorough and comprehensive.

It should be noted that when an element is referred to as being “fixed” to another element, it can be directly on the other element or there can also be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and similar expressions are used herein for purposes of illustration only.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of the invention. The terms used herein in the description of the present invention are for the purpose of describing specific embodiments only, and are not intended to limit the present invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to FIG. 1 and FIG. 2 , in an embodiment, the mobile terminal rear case 10 is a mobile phone rear case. Referring to FIG. 3 at the same time, the mobile terminal rear case 10 includes a housing 100 , a partition bar 200 and a decoration layer 300 . The housing 100 is made of metal, and the housing 100 has an outer surface 110 and a second surface (not shown). Specifically, in one embodiment, the housing 100 is made of aluminum alloy, the outer surface 110 can be gripped by a user, and the inner surface is opposite to the outer surface 110 . In an embodiment, a screen assembly may be provided on one side of the inner surface, and the screen assembly is fixedly connected to the mobile terminal rear case 10, and both the screen assembly and the mobile terminal rear case 10 are part of the mobile terminal. A slot (not shown in the figure) is opened on the housing 100 , and the slot runs through the outer surface 110 and the inner surface of the housing 100 . In one embodiment, the casing 100 is substantially rectangular, and one end of the casing 100 is provided with a mounting hole 120 , and the mounting hole 120 can be used for light transmission of the camera assembly. The slot is located at one end of the housing 100 close to the installation hole 120 , the slot extends along the width direction of the housing 100 , and the slot penetrates the outer surface 110 and the inner surface of the housing 100 . In one embodiment, there are two slots, one of which is located at one end of the housing 100 close to the installation hole 120 , and the other is located at the other end of the housing 100 .

In the embodiment shown in FIG. 1 , the slit is approximately linear, and the slit extends along the width direction of the casing 100 . In the embodiment shown in FIG. 2 , the slot is roughly C-shaped, close to the edge of the housing 100 , and extends along the outline of the housing 100 . In one embodiment, the two slits are roughly double C-shaped, and the slits are located near the edge of the housing 100 and extend from one side of the housing 100 to the other side of the housing 100 along the outline of the housing 100 . In other implementation manners, the slit can also be in other shapes. For example, one of the slots may be C-shaped and the other slot may be straight. The partition bar 200 is embedded in the gap, the material of the partition bar 200 is insulating material, and the partition bar 200 is fixedly connected with the casing 100 . In one embodiment, the partition bar 200 is made of plastic. In one embodiment, the plastic is filled in the gap by injection molding, so that the housing 100 and the partition bar 200 are closely connected. The decoration layer 300 covers a side of the partition bar 200 close to the outer surface 110 and is fixedly connected with the casing 100 . In an embodiment, the decoration layer 300 can also be fixedly connected with the partition bar 200 . The decoration layer 300 has certain light transmittance, and the color difference ΔE between the color of the partition strip 200 covered by the decoration layer 300 and the color of the outer surface 110 is in the range of 0-2.5.

The above-mentioned mobile terminal rear case 10, the partition bar 200 is embedded in the gap, and the decorative layer 300 is provided on the side of the partition bar 200 close to the outer surface 110 of the housing 100, so that the surface of the partition bar 200 behind the decorative layer 300 is covered The range of the color difference ΔE between the color of the decorative layer 300 and the color of the outer surface 110 of the housing 100 is 0 to 2.5, so that the color of the surface of the partition bar 200 covered with the decorative layer 300 and the color of the outer surface of the housing 100 tend toward each other. in agreement. When the partition bar 200 is made of plastic material, by covering the plastic part with the decorative layer 300, there is no obvious color difference between the plastic part and the metal part of the mobile terminal rear case 10, so that the appearance of the mobile terminal rear case 10 is approximately integrated. molding, thereby improving the integrity and aesthetics of the mobile terminal rear case 10 .

Referring to Fig. 3, in one embodiment, the decorative layer 300 includes an adhesive layer 310 and a colored paint layer 320, the adhesive layer is adhered to the surface of the partition bar 200 away from the inner surface, and the colored paint layer 320 is adhered to the adhesive layer 320. On the surface of the layer 310 facing away from the inner surface, the color difference ΔE between the color of the paint layer 320 and the color of the outer surface 110 ranges from 0 to 2.5. Specifically, in one embodiment, the material of the adhesive layer 310 has plastic-friendly properties, and the material of the adhesive layer 310 has metal-friendly properties. The adhesive layer 310 adheres to the partition bar 200 in the gap, and can be closely connected with the surface of the partition bar 200 . The colored paint layer 320 adheres to the adhesive layer 310 and can be closely connected with the surface of the adhesive layer 310 . The color paint layer 320 has a color, and the material of the color paint layer 320 can be adjusted according to the color of the outer surface 110 of the mobile terminal rear case 10, so that the color and movement of the color paint layer 320 after the deployment is covered on the surface of the partition bar 200 The color difference value ΔE of the color of the outer surface 110 of the terminal rear case 10 ranges from 0 to 2.5, that is, the color of the partition bar 200 covered with the paint layer 320 and the color of the outer surface 110 of the mobile terminal rear case 10 are visually distinct. There is almost no difference in the design, so as to improve the integrity and aesthetics of the mobile terminal rear case 10.

In one embodiment, the thickness of the adhesive layer 310 is 3 micrometers to 9 micrometers. When the thickness of the adhesive layer 310 is within the above range, it is beneficial to the stability of the connection between the adhesive layer 310 and the partition strip 200, and it is also beneficial to The stability of the connection between the adhesive layer 310 and the paint layer 320 . In one embodiment, the thickness of the color paint layer 320 is 3 microns to 9 microns. When the thickness of the color paint layer 320 is within the above range, it is beneficial for the color paint layer 320 to present a uniform color, and it can ensure that the color paint layer 320 It is firmly connected with the adhesive layer 310 . Further, in one embodiment, the thickness of the adhesive layer 310 is 7.5 microns to 8.5 microns. When the thickness of the adhesive layer 310 is within this range, the bonding between the adhesive layer 310 and the partition strip 200 and the paint layer 320 can be achieved. The stability of the connection is also beneficial to the forming process of the adhesive layer 310 and saves the use of materials for the adhesive layer 310 . In one embodiment, the thickness of the color paint layer 320 is 7.5 microns to 8.5 microns. When the thickness of the color paint layer 320 is within this range, it can make the color paint layer 320 present a uniform color and ensure that the color paint layer 320 and The stable connection of the adhesive layer 310 is also beneficial to the molding process of the color paint layer 320 and saves the material usage of the color paint layer 320 .

In one embodiment, the decoration layer 300 further includes a strengthening layer 330 , the strengthening layer 330 is adhered to the surface of the paint layer 320 facing away from the inner surface, and the material of the strengthening layer 330 is a transparent material. The role of the reinforcement layer 330 is to increase the surface hardness and strength of the decoration layer 300 and prevent the paint layer 320 from being easily damaged during use. In one embodiment, the reinforcement layer 330 is made of UV (Ultraviolet Rays) curable glue, which is easy to use, and after being coated on the paint layer 320, it can be cured by irradiating with ultraviolet light. The cured reinforcement layer 330 is transparent and has little effect on the color of the paint layer 320 . In one embodiment, the thickness of the reinforcement layer 330 is 3 mm to 9 mm. When the thickness of the reinforcement layer 330 is within the above range, it is beneficial for the stable connection between the reinforcement layer 330 and the paint layer 320 . Further, in one embodiment, the thickness of the reinforcement layer 330 is 7.5 microns to 8.5 microns. When the thickness of the reinforcement layer 330 is within this range, the stability of the connection between the reinforcement layer 330 and the paint layer 320 can be achieved, and It is beneficial to ensure the hardness and strength of the reinforcement layer 330 so that the reinforcement layer 330 can well protect the paint layer 320 .

In one embodiment, the thickness of the decoration layer is 7 microns-50 microns. In one embodiment, the thickness of the decoration layer is 8 microns-45 microns. When the thickness of the decorative layer 300 is within the above range, it is beneficial to form a close connection between the decorative layer 300 and the partition bar 200 in the gap, which can not only ensure the stability of the decorative layer 300, but also prevent the decorative layer 300 from being damaged due to too large a thickness. The appearance of the mobile terminal rear case 10 is adversely affected. Specifically, in one embodiment, the thickness of the bonding layer 310 can be taken as 8 microns, the thickness of the color paint layer 320 can be taken as 8 microns, and the thickness of the strengthening layer 330 can also be taken as 8 microns. After 320 and the reinforcing layer 330 are stacked and cured in sequence, the thickness of the decoration layer 300 is approximately 24 microns. The decoration layer 300 with the above structure can not only be firmly connected with the partition bar 200 in the gap, ensure the hardness and strength of the decoration layer 300, but also realize that the color difference between the decoration layer 300 and the outer surface 110 of the housing 100 is within a predetermined range inside, so that the outer surface of the mobile terminal rear case 10 presents a good integrity. It can be understood that the reinforcement layer 330 can be omitted in the decoration layer 300 , and the function of the decoration layer 300 will not be affected after the reinforcement layer 330 is omitted. In other embodiments, a material that increases the strength and hardness of the color paint layer 320 may also be added to the material of the color paint layer 320 , so that the color paint layer 320 has sufficient strength and hardness.

Referring to FIG. 4 at the same time, in one embodiment, the gap includes a first accommodating groove (not marked) close to the inner surface of the housing 100 and a second accommodating groove (not marked) close to the outer surface 110 of the housing 100 ), the first accommodating tank communicates with the second accommodating tank. The partition strip 200 is located in the first accommodating groove, the decoration layer 300 is located in the second accommodating groove, and the surface of the decoration layer 300 close to the outer surface 110 is flush with the outer surface 110 . By processing the second accommodating groove on the casing 100 of the rear case, and setting the decorative layer 300 in the second accommodating groove, on the one hand, it is beneficial to align the decorative layer 300 with the gap, so as to facilitate the alignment of the decorative layer 300 with the mobile terminal. Processing of the rear case 10. On the other hand, by opening the second accommodating groove, the surface of the decoration layer 300 is easier to align with the outer surface 110 of the mobile terminal rear case 10, which can prevent the protrusions on the mobile terminal rear case 10 from affecting the reflection of light, thus ensuring The integrity of the appearance of the mobile terminal rear case 10 . It can be understood that the depth of the second accommodating groove can be adaptively adjusted according to the thickness of the decoration layer 300 . Further, since the decoration layer 300 is disposed in the second accommodation groove, when the decoration layer 300 fills the interior of the second accommodation groove, the groove wall of the second accommodation groove can provide good protection for the decoration layer 300 . Therefore, the thickness of the decorative layer 300 can be very small. It only needs to ensure that the range of the color difference ΔE between the color of the colored paint layer 320 in the decorative layer 300 after covering the surface of the partition bar 200 and the color of the outer surface 110 of the housing 100 is 0. ~2.5 is enough. It can be understood that when the second accommodating groove is opened on the outer surface 110 of the housing 100, the decorative layer 300 may not be in contact with the partition bar 200, that is, there may be a gap between the decorative layer 300 and the partition bar 200, and the decorative layer 300 is fixedly connected with the housing 100, and after the decorative layer 300 covers the partition bar 200, the color difference ΔE between the color formed by the light reflected by the decorative layer 300 and the partition bar 200 and the color of the outer surface 110 of the housing 100 is also It can be in the range of 0 to 2.5.

In one embodiment, the covering area of the decoration layer 300 exceeds the area of the gap, that is, the decoration layer 30 not only covers the gap, but also covers the outer surface 110 of the casing 100 , and the decoration layer 300 is fixedly connected with the casing 100 . Specifically, in one embodiment, the area of the decoration layer 300 is approximately equal to the area of the outer surface 110 of the housing 100, and the decoration layer 300 is covered on the outer surface 110 of the housing 100 through the adhesive layer 310, so that the decoration layer 300 can Cover the area around the crevice completely. In one embodiment, the decorative layer 300 is fixedly connected to the partition bar 200 in the gap, and is fixedly connected to the casing 100. The surface of the entire mobile terminal rear casing 10 that is held by the user generally presents a colored paint layer 320 covering the casing. The color formed behind the outer surface 110 of the housing 100 can therefore make the appearance of the mobile terminal rear case 10 nearly integrated, and make the gap between the gap and the casing 100 also be covered.

Referring to FIG. 5 and FIG. 6 , in an embodiment, a manufacturing method of the mobile terminal rear case 10 is also provided. The manufacturing method of the mobile terminal rear case 10 includes the following steps.

Step S100 , processing the decoration layer 300 on the film carrier 400 to prepare the pasting film 20 .

Specifically, in one embodiment, the material of the film carrier 400 is PET (Polyethylene terephthalate, polyethylene terephthalate), and the PET film carrier 400 has excellent physical and mechanical properties in a wide temperature range, and The PET film carrier 400 has excellent electrical insulation, good creep resistance, fatigue resistance, friction resistance and dimensional stability. The function of the film carrier 400 is that it can provide support for the decorative layer 300, so as to facilitate the coating of the decorative layer 300 on the film carrier 400, and the film carrier 400 can also be torn off from the decorative layer 300 smoothly, so that the decorative layer 300 covers the On the partition bar 200 of the rear case 10 of the mobile terminal.

In an embodiment, step S100 may also specifically include the following steps.

Step S110 , coating the strengthening layer 330 on the surface of the film carrier 400 .

Specifically, in one embodiment, the strengthening layer 330 is directly coated on the surface of the film carrier 400 , and the material of the strengthening layer 330 is a transparent material. In one embodiment, the reinforcement layer 330 is directly exposed to the environment, so the reinforcement layer 330 is required to have high hardness and strength to prevent the reinforcement layer 330 from being easily worn or damaged. In one embodiment, the strengthening layer 330 adopts UV (Ultraviolet Rays, ultraviolet light) curing glue, which is easy to use and can be cured when irradiated with ultraviolet light. The cured UV layer is transparent, which is beneficial to the light through. In one embodiment, the thickness of the reinforcement layer 330 is 3 mm to 9 mm. When the thickness of the reinforcement layer 330 is within the above range, the reinforcement layer 330 has better strength and hardness. Further, in one embodiment, the thickness of the reinforcement layer 330 is 7.5 microns to 8.5 microns. When the thickness of the reinforcement layer 330 is within this range, the hardness and strength of the reinforcement layer 330 can be guaranteed, so it is not necessary to make the reinforcement layer 330 The thickness is too large to save the material usage of the reinforcement layer 330 .

Step S120, coating the colored paint layer 320 on the strengthening layer 330, the color of the colored paint layer 320 should ensure that when the colored paint layer 320 covers the partition strip 200, the color formed by the reflected light and the color of the outer surface 110 have a color difference The value ΔE ranges from 0 to 2.5.

Specifically, in an embodiment, the colored paint layer 320 is coated on the strengthening layer 330 , and the colored paint layer 320 can be tightly connected to the surface of the strengthening layer 330 away from the film carrier 400 . The colored paint layer 320 has a color and has a certain degree of light transmission, and the material of the colored paint layer 320 can be adjusted according to the color of the outer surface 110 of the mobile terminal rear case 10, so that the adjusted colored paint layer 320 covers the partition bar 200 The color difference ΔE between the painted color and the color of the outer surface 110 of the housing 100 is in the range of 0 to 2.5, that is, the color of the colored paint layer 320 covered on the partition bar 200 is the same as that of the outer surface of the mobile terminal rear case 10. The 110 colors have little visual difference. Since the strengthening layer 330 is transparent, the color of the colored paint layer 320 is basically not affected by the strengthening layer 330 , so the color of the colored paint layer 320 can be well matched with the color of the outer surface 110 of the casing 100 . In one embodiment, the thickness of the color paint layer 320 is 3 microns to 9 microns. When the thickness of the color paint layer 320 is within the above range, it is beneficial for the color paint layer 320 to present a uniform color, and it can ensure that the color paint layer 320 Strong connection to reinforcement layer 330 . Further, in one embodiment, the thickness of the color paint layer 320 is 7.5 microns to 8.5 microns. When the thickness of the color paint layer 320 is within this range, it can make the color paint layer 320 present a uniform color and ensure that the color paint layer The solid connection between 320 and the strengthening layer 330 is also conducive to the processing of the color paint layer 320. Since the color of the color paint layer 320 can be evenly distributed without further increasing the thickness of the color paint layer 320, the material of the color paint layer 320 can be saved. use. It can be understood that the colored paint layer 320 can also be covered on the reinforcement layer 330 by inkjet or silk screen printing.

Step S130 , coating an adhesive layer on the surface of the paint layer 320 facing away from the film carrier 400 to prepare the sticking film 20 .

Specifically, in one embodiment, the material of the adhesive layer 310 has plastic-friendly properties. The adhesive layer 310 is adhered to the color paint layer 320 and can be tightly connected to the surface of the color paint layer 320 away from the film carrier 400 . The function of the adhesive layer 310 is that it can be firmly connected to the partition bar 200 in the gap of the mobile terminal rear case 10, thereby facilitating the firm connection of the colored paint layer 320 and the strengthening layer 330 to the rear case, so as to prevent the colored paint layer from 320 and the reinforcing layer 330 are peeled off from the rear case 10 of the mobile terminal. In one embodiment, the material of the adhesive layer 310 also has metal-friendly properties, so the adhesive layer 310 can be adhered to the metal part of the mobile terminal rear case 10, so that the adhesive layer 310 and the mobile terminal rear case 10 Form a tighter connection. In one embodiment, the thickness of the adhesive layer 310 is 3 micrometers to 9 micrometers. When the thickness of the adhesive layer 310 is within the above range, it is conducive to the firm connection between the adhesive layer 310 and the partition bar 200 of the rear case 10 of the mobile terminal. , which is beneficial to the stability of the connection between the adhesive layer 310 and the paint layer 320 . In one embodiment, the thickness of the adhesive layer 310 is 7.5 microns to 8.5 microns. When the thickness of the adhesive layer 310 is within this range, the adhesive layer 310 can be firmly connected to the partition strip 200 and the paint layer 320. For connection, the thickness of the adhesive layer 310 may not need to be continuously increased, so as to save the material usage of the adhesive layer 310 .

In one embodiment, after the reinforcement layer 330 , the color paint layer 320 and the adhesive layer 310 are sequentially coated on the film carrier 400 , the sticking film 20 is prepared. In one embodiment, the decorative layer 300 includes a strengthening layer 330, a paint layer 320 and an adhesive layer 310, and the thickness of the decorative layer 300 is 8 microns to 50 microns. When the thickness of the decorative layer 300 is within this range, it is beneficial The decoration layer 300 forms a close connection with the partition bar 200 in the gap, which can ensure the stability of the decoration layer 300 and avoid adverse effects on the appearance of the mobile terminal rear case 10 due to the thickness of the decoration layer 300 being too large. In one embodiment, the thickness of the bonding layer 310 can be taken as 8 microns, the thickness of the color paint layer 320 can be taken as 8 microns, and the thickness of the reinforcement layer 330 can also be taken as 8 microns. After the layers 330 are sequentially stacked and cured, the thickness of the decoration layer 300 is approximately 24 microns. The decoration layer 300 with the above structure can not only be firmly connected with the partition bar 200 in the gap, ensure the hardness and strength of the decoration layer 300, but also realize that the color difference between the decoration layer 300 and the outer surface 110 of the housing 100 is within a predetermined range inside, so that the gap and the outer surface 110 of the casing 100 present a good integrity.

It can be understood that the above step S110 can be omitted. That is, the reinforcement layer 330 can be omitted in the decoration layer 300 , and the function of the decoration layer 300 will not be affected after the reinforcement layer 330 is omitted. In other embodiments, a material that increases the strength and hardness of the color paint layer 320 may also be added to the material of the color paint layer 320 , so that the color paint layer 320 has sufficient strength and hardness.

Step S200, setting up a second accommodation groove on the outer surface 110, the extension direction of the second accommodation groove is the same as the extension direction of the first accommodation groove, the first accommodation groove communicates with the second accommodation groove, and the first accommodation groove The slots are used to fill the spacer bars 200 .

Specifically, in one embodiment, the width of the decoration layer 300 matches the width of the second accommodating groove, the decoration layer 300 is located in the second accommodating groove, and the surface of the decoration layer 300 close to the outer surface 110 of the casing 100 flush with the outer surface 110 . By processing the second accommodating groove on the shell 100 of the rear case, both the second accommodating groove and the first accommodating groove are part of the gap, and the decoration layer 300 can be arranged in the second accommodating groove, which is beneficial to The decoration layer 300 is aligned with the gap, so as to facilitate the processing of the decoration layer 300 and the rear case 10 of the mobile terminal. On the other hand, by opening the second accommodating groove, the surface of the reinforcement layer 330 or the surface of the color paint layer 320 is easier to align with the outer surface 110 of the housing 100, thereby preventing the mobile terminal rear case 10 from having protrusions that affect the light. reflection, so as to ensure the integrity of the appearance of the mobile terminal rear case 10. It can be understood that the depth of the second accommodating groove can be adjusted adaptively depending on the thickness of the decoration layer 300 . Further, since the decoration layer 300 is disposed in the second accommodation groove, when the decoration layer 300 fills the interior of the second accommodation groove, the groove wall of the second accommodation groove can provide good protection for the decoration layer 300 . Therefore, the thickness of the decorative layer 300 can be very small. It is only necessary to ensure that the range of the color difference ΔE between the color of the colored paint layer 320 in the decorative layer 300 covering the partition bar 200 and the color of the outer surface 110 of the mobile terminal rear case 10 is 0 to 2.5 is enough. It can be understood that step S200 can also be performed before preparing the sticking film 20 .

It can be understood that step S200 can be omitted. In the embodiment where step S200 is omitted, the shape of the sticking film 20 matches the shape of the outer surface 110 , the decoration layer 300 covers both the gap and the outer surface 110 , and the decoration layer 300 is fixedly connected to the casing 100 . Specifically, in one embodiment, the area of the decoration layer 300 is approximately equal to the area of the outer surface 110 of the casing 100, the decoration layer 300 completely covers the outer surface 110 of the mobile terminal rear case 10 through the adhesive layer 310, the decoration layer After the 300 is fixedly connected to the housing 100, the entire outer surface 110 of the mobile terminal rear case 10 presents the color after the colored paint layer 320 covers the outer surface 110, so that the appearance of the mobile terminal rear case 10 can be nearly integrated, and The gap at the joint between the gap and the housing 100 is also shielded.

Step S300 , sticking the film 20 to the side of the partition bar 200 of the mobile terminal rear case 10 close to the outer surface 110 of the housing 100 , so that the decoration layer 300 is closely connected with the housing 100 .

Specifically, during use, it is necessary to direct the adhesive layer 310 of the decorative layer 300 towards the outer surface 110 of the housing 100, and attach the film 20 to the top of the partition bar 200 in the gap, so that the adhesive layer 310 and the housing The body 100 is tightly connected. It can be understood that, during the use of the film 20, the paint layer 320 of the decorative layer 300 needs to be able to completely cover the surface of the partition bar 200, so as to prevent the partition bar 200 from being exposed, causing the partition bar 200 to contact with the metal of the mobile terminal rear case 10. Chromatic aberration occurs partially. Since the outer surface 110 of the housing 100 is curved, an external force needs to be applied to make the film 20 deformed and tightly connected to the outer surface 110 , and to prevent residual air or even air bubbles between the adhesive layer 310 and the surface of the partition strip 200 . After the sticking film 20 is attached to the partition bar 200 of the mobile terminal rear case 10, the temperature of the sticking film 20 can be properly raised, for example, the surface of the sticking film 20 can be irradiated with infrared rays, so that the sticking film 20 can be softened so as to be closely connected with the partition bar 200, and smoothly The air between the sticking film 20 and the partition bar 200 is discharged.

Step S400 , tearing off the film carrier 400 .

The film 20 and the partition bar 200 are closely attached, so that after the adhesive layer 310 of the decorative layer 300 is closely connected with the surface of the partition bar 200, the film carrier 400 of the film 20 can be torn off, so that the colored paint layer 320 of the decorative layer 300 Or the reinforcement layer 330 is exposed to the environment. After the film carrier 400 is torn off, the surface of the partition strip 200 in the antenna groove is covered by the decorative layer 300 , showing the color of the colored paint layer 320 covering the top of the partition strip 200 . The range of the color difference ΔE between the color and the color of the outer surface 110 of the housing 100 is in the range of 0 to 2.5, so that the outer surface of the entire mobile terminal rear case 10 can be nearly integrated, making the appearance of the mobile terminal rear case 10 More beautiful and concise.

Referring to FIG. 8 at the same time, in one embodiment, a mobile terminal is provided, the mobile terminal includes a screen assembly 30 and a mobile terminal rear case 10, and the mobile terminal rear case 10 is fixedly connected with the screen assembly 30 as a whole. A partition bar 200 is provided in the gap of the rear case 10 of the mobile terminal. In one embodiment, the material of the partition bar 200 is plastic. The side of the partition bar 200 close to the outer surface 110 of the housing 100 is provided with a decorative layer 300, and the decorative layer 300 covers the top of the partition bar 200 and the color formed by reflected light matches the outer surface of the housing 100 of the mobile terminal rear case 10. The color difference value ΔE of the color of 110 is in the range of 0 to 2.5. Therefore, the appearance of the mobile terminal rear case 10 has an excellent integrity, thereby making the appearance of the mobile terminal more beautiful and concise.

The technical features of the above-mentioned embodiments can be combined arbitrarily. To make the description concise, all possible combinations of the technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, should be considered as within the scope of this specification.

The above-mentioned embodiments only express several implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but should not be construed as limiting the patent scope of the invention. It should be pointed out that those skilled in the art can make several modifications and improvements 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 for the present invention should be based on the appended claims.

Claims (15)

1. A mobile terminal rear shell, characterized in that, comprising: A casing, the casing is made of metal, the casing has an outer surface and an inner surface oppositely arranged, and a gap is opened on the casing, and the gap runs through the outer surface and the inner surface; A partition strip, the material of the partition strip is an insulating material, the partition strip is embedded in the gap and fixedly connected with the housing; and A decorative layer, covering the side of the partition bar close to the outer surface and fixedly connected to the housing; the color difference between the color of the partition bar covered by the decorative layer and the color of the outer surface The value ΔE ranges from 0 to 2.5. 2. The rear case of the mobile terminal according to claim 1, wherein the gap comprises a first accommodating groove close to the inner surface and a second accommodating groove close to the outer surface, the first accommodating groove The accommodating groove communicates with the second accommodating groove; the partition bar is located in the first accommodating groove, the decorative layer is located in the second accommodating groove, and the The surface of the surface is flush with the outer surface. 3 . The mobile terminal rear case according to claim 1 , wherein the decoration layer also covers the outer surface of the casing. 4 . 4. The mobile terminal rear case according to claim 2 or 3, wherein the partition bar is made of plastic; the decorative layer includes an adhesive layer and a paint layer, and the adhesive layer is adhered to The side of the partition strip close to the outer surface, the colored paint layer adhered to the side of the adhesive layer close to the outer surface, the partition strip covered by the colored paint layer The range of color difference ΔE between the color and the color of the outer surface is 0-2.5. 5. The rear case of the mobile terminal according to claim 4, wherein the decorative layer further comprises a reinforcing layer, the reinforcing layer is adhered to the side of the colored paint layer close to the outer surface, the The reinforcement layer is made of transparent material. 6. The mobile terminal rear case according to claim 4, wherein the decorative layer has a thickness of 8 microns to 50 microns, the adhesive layer has a thickness of 3 microns to 9 microns, and the color paint layer The thickness is 3 microns to 9 microns. 7 . The mobile terminal rear case according to claim 4 , wherein the adhesive layer has a thickness of 7.5 microns to 8.5 microns, and the color paint layer has a thickness of 7.5 microns to 8.5 microns. 8. A method for manufacturing a mobile terminal rear shell, comprising the steps of: processing a decorative layer on a film carrier to produce a foil; The film is adhered to the side of the outer surface of the partition bar close to the rear shell of the mobile terminal, so that the decorative layer is fixedly connected to the housing, and the color of the partition bar covered by the decorative layer is consistent with the The color difference value ΔE of the color of the outer surface ranges from 0 to 2.5; and The membrane carrier is torn off. 9. The manufacturing method of the mobile terminal rear case according to claim 8, characterized in that, the step of processing the decorative layer on the film carrier to prepare a sticking film comprises: Coating a colored paint layer on the film carrier, the thickness of the colored paint layer is 3 microns to 9 microns; and An adhesive layer is coated on the surface of the color paint layer facing away from the film carrier, and the thickness of the adhesive layer is 3 microns to 9 microns. 10. The manufacturing method of the mobile terminal rear case according to claim 9, characterized in that, before the step of coating the paint layer on the surface of the film carrier, the method further comprises: A strengthening layer is coated on the surface of the film carrier, so that the strengthening layer is located between the color paint layer and the film carrier, and the thickness of the strengthening layer is 3 microns to 9 microns. 11. The manufacturing method of the mobile terminal rear case according to claim 8, further comprising the following steps: A second accommodating groove is provided on the outer surface, the second accommodating groove communicates with the first accommodating groove of the rear case of the mobile terminal, and the extension direction of the second accommodating groove is the same as that of the first accommodating groove. The extension directions of the accommodating grooves are the same, and the first accommodating groove is used for filling the partition bar. 12. The manufacturing method of the mobile terminal rear case according to claim 11, wherein the width of the decoration layer matches the width of the second accommodating groove, and the decoration layer is located in the second accommodating groove. placed in the groove, the surface of the decorative layer close to the outer surface is flush with the outer surface. 13. The method for manufacturing a mobile terminal rear case according to claim 8, wherein the shape of the film matches the shape of the outer surface, the decorative layer is also covered on the outer surface, and The decoration layer is fixedly connected with the casing. 14. A mobile terminal, characterized by comprising a screen component and the mobile terminal rear case according to any one of claims 1 to 7, the mobile terminal rear case is fixedly connected to the screen component. 15. A mobile terminal, characterized in that it comprises a screen component and a mobile terminal rear case manufactured by the method for manufacturing a mobile terminal rear case according to any one of claims 8 to 13, the mobile terminal rear case and the mobile terminal rear case Screen components are permanently connected.