CN111263538B

CN111263538B - Film-coated curved surface shell, manufacturing method thereof, shell of electronic equipment and electronic equipment

Info

Publication number: CN111263538B
Application number: CN202010206461.XA
Authority: CN
Inventors: 钱勇军
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2020-03-23
Filing date: 2020-03-23
Publication date: 2021-06-04
Anticipated expiration: 2040-03-23
Also published as: CN111263538A

Abstract

The application provides a film-coated curved surface shell, a manufacturing method of the film-coated curved surface shell, a shell of electronic equipment and the electronic equipment. The method for manufacturing the film-coated curved shell comprises the following steps: forming a texture layer on the surface of the soft membrane; attaching the surface of the soft membrane far away from the texture layer to the concave surface of the curved surface shell body; forming an optical film layer on the surface of the texture layer far away from the curved surface shell body; and forming an ink layer on the surface of the optical film layer far away from the curved surface shell body. The manufacturing method provided by the application forms the texture layer on one surface of the soft diaphragm firstly, then laminates another surface to the concave surface of the curved surface shell body, plates the optical film layer again, sprays and solidifies the printing ink layer, so, the appearance effect of gorgeous texture can be manufactured on the curved surface shell body with a large bending angle, the problems of cracking of a coating layer, orange peel, concave and convex points and the like can be effectively solved when the curved surface shell body with a large bending angle is pasted with the film, and therefore the overall texture and the manufacturing yield of the electronic equipment are obviously improved.

Description

Film-coated curved surface shell, manufacturing method thereof, shell of electronic equipment and electronic equipment

Technical Field

The application relates to the technical field of manufacturing of shells of electronic equipment, in particular to a film-coated curved-surface shell, a manufacturing method of the film-coated curved-surface shell, a shell of the electronic equipment and the electronic equipment.

Background

The bending angle of the three-dimensional (3D) battery cover glass at the present stage is relatively small (usually at 60 °) and mainly made of doubly curved glass, and different lamination structures are mainly realized by two processes.

The first process comprises the steps of sequentially carrying out ink jet printing on a priming organic layer, depositing a multilayer optical film, spraying and curing an ink substrate layer and plating an anti-fingerprint layer on white glass, can realize the decoration of 3D cover plate glass with a conventional angle, but lacks texture effect to influence the texture and aesthetic feeling of a product to a certain extent, and can not carry out ink jet printing on hyperbolic and quadric glass with a large bending angle (more than 70 degrees) at the position of a radian side wall to form the organic layer, so that the process has obvious limitation.

The second process comprises the steps of plating a fingerprint-proof layer on the convex surface of white glass, then carrying out UV transfer printing on a polyethylene terephthalate (PET) film to form a texture layer, depositing a plurality of layers of optical films and a silk-screen printing ink layer, wherein compared with a battery cover plate formed by singly adopting a transfer printing or spraying process, the formed battery cover plate glass is obviously improved in appearance effect and has a texture effect, but the PET material is poor in stretchability, so that the four-curved glass with a large bending angle (more than 70 degrees) is not attached in place at four corners, wrinkles, bubbles and the like are easily generated, and the process has obvious limitations.

Disclosure of Invention

An object of the embodiments of the present application is to provide a method for manufacturing a film-covered curved casing, a film-covered curved casing manufactured by the method, a casing including the film-covered curved casing, and an electronic device including the casing, in which a soft membrane is first subjected to UV transfer printing of a texture layer and then attached to a curved casing body, and then subjected to processes such as film coating and spraying, so as to implement a battery cover plate having a gorgeous appearance effect.

In a first aspect of an embodiment of the present application, a method for manufacturing a film-covered curved shell is provided.

According to an embodiment of the application, the method comprises: forming a texture layer on the surface of the soft membrane; attaching the surface of the soft membrane far away from the texture layer to the concave surface of the curved surface shell body; forming an optical film layer on the surface of the texture layer far away from the curved surface shell body; and forming an ink layer on the surface of the optical film layer far away from the curved surface shell body.

By adopting the manufacturing method provided by the embodiment of the application, the texture layer is formed on one surface of the soft diaphragm, the other surface of the soft diaphragm is attached to the concave surface of the curved surface shell body, the optical film layer is plated, the ink layer is sprayed and cured, therefore, the appearance effect of gorgeous textures can be manufactured on the curved surface shell body with the large bending angle, the problems of cracking of the coating layer, orange peel, concave and convex points and the like can be effectively solved when the curved surface shell body with the large bending angle is pasted with the film, and the overall texture and the manufacturing yield of the electronic equipment are obviously improved.

In a second aspect of the present application, a film-covered curved shell is presented.

According to the embodiment of the application, the film-coated curved surface shell is manufactured by the method.

The tectorial membrane curved surface casing of this application embodiment, through form the texture layer earlier on the flexible membrane piece, then laminate the concave surface of curved surface casing body with the flexible membrane piece, plate the optics rete again, the spraying solidifies the printing ink layer, so, the easy coating film layer fracture that appears when can avoiding the optics rete to laminate the curved surface casing body of big bending angle, orange peel, unsmooth spot scheduling problem, thereby when making tectorial membrane curved surface casing have gorgeous texture effect, still can have better whole feel and higher yields. It will be appreciated by those skilled in the art that the features and advantages described above with respect to the method of making a laminated curved shell are still applicable to the laminated curved shell and will not be described in detail herein.

In a third aspect of the present application, a housing for an electronic device is presented.

According to an embodiment of the application, at least part of the shell is the film-coated curved shell.

The electronic equipment shell has the advantages that when the appearance of the electronic equipment shell has the gorgeous texture effect, the overall appearance texture is better, the manufacturing yield is higher, and therefore the appearance effect of the shell is richer, and the cost is lower. Those skilled in the art will appreciate that the features and advantages described above with respect to the film-covered curved housing are applicable to the housing of the electronic device and will not be described in detail herein.

In a fourth aspect of the present application, an electronic device is presented.

According to an embodiment of the present application, the electronic device includes: the above-mentioned housing; a display device coupled to the housing.

The electronic equipment provided by the embodiment of the application has the advantages that the shell has the appearance effect of gorgeous textures, and the cost is lower, so that the market competitiveness of the electronic equipment is better. It will be appreciated by those skilled in the art that the features and advantages described above with respect to the housing of the electronic device, which are not described in detail herein, still apply to the electronic device.

Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.

Drawings

The above and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic flow chart of a method for manufacturing a film-coated curved shell according to an embodiment of the present application;

FIG. 2 is a schematic illustration of a method step of fabricating a film coated curved shell according to one embodiment of the present application;

FIG. 3 is a schematic view of a bend angle of a curved glass according to one embodiment of the present application;

FIG. 4 is a schematic perspective view of an appearance effect of an electronic device according to an embodiment of the present application;

FIG. 5 is a photograph comparing a four-curved glass shell (a) produced by a conventional method and a four-curved glass shell (b) produced by the method of the present application.

Reference numerals

100 curved surface casing body

200 soft film

300 texture layer

400 optical film layer

500 ink layer

10 casing

20 display device

1 electronic device

Detailed Description

The following examples are presented in detail and are not to be construed as limiting the present application, as those skilled in the art will appreciate. Unless otherwise indicated, specific techniques or conditions are not explicitly described in the following examples, and those skilled in the art may follow techniques or conditions commonly employed in the art or in accordance with the product specifications.

In one aspect of an embodiment of the present application, a method of fabricating a film-covered curved shell is provided. According to an embodiment of the present application, referring to fig. 1, the manufacturing method includes:

s100: and forming a texture layer on the surface of the soft film.

In this step, referring to fig. 2 (a), a texture layer 300 is first formed on one surface of the soft film sheet 200. Specifically, the texture layer 300 with a pattern may be formed on one surface of the soft film 200 by a UV transfer technique, so that the texture layer 300 formed by curing the UV glue has good flexibility, and may be uniformly attached to the concave surface of the curved housing body in the subsequent attaching process. Thereby the finally manufactured film-coated curved glass has the texture appearance effect.

The applicant of the present application has found that, referring to fig. 5 (a), when a conventional hard film (for example, a PET film) is bonded to a large bending angle of a four-curved glass, the film is not bonded at four corners, and wrinkles, bubbles, and the like are easily generated. Therefore, in some embodiments of the present application, the inventors select the soft film 200, and the material forming the soft film 200 may include Thermoplastic Polyurethane (TPU), so that the problem of wrinkles and bubbles easily generated during the attaching process can be solved well by using a TPU soft film with better stretchability. In some embodiments of the present application, a hot melt adhesive layer may be disposed on a surface of the soft film 200 away from the texture layer 300, so as to facilitate hot-press bonding in a subsequent bonding step. Specifically, the thickness of the TPU soft film can be 0.05mm or 0.10mm, and the thickness of the UV texture layer can be 9-18 microns.

In some embodiments of the present application, a protective layer may be further formed on a surface of the texture layer 300 away from the soft film 200, so as to protect the texture layer 300 formed by curing the UV glue from being easily affected by the subsequent thermal pressing process. And the number of the first and second electrodes,

s200: and attaching the surface of the soft membrane far away from the texture layer to the concave surface of the curved surface shell body.

In this step, referring to fig. 2 (b), the other surface of the soft membrane 200 produced in step S100 is bonded to the concave surface of the curved casing body 100. The inventor of this application discovers in the research process, UV transfer printing layer, coating film layer and the printing ink layer on the TPU surface can be stretched and the fracture appears easily in the laminating in-process, in addition, because the TPU substrate is too soft, the positive of tectorial membrane curved surface glass can all be reflected to the unsmooth point and the foreign matter on printing ink layer and UV texture layer, still leads to defects such as obvious orange peel and unsmooth point easily to can seriously influence product appearance and feel.

In some embodiments of the present application, the curved casing body 100 may be curved glass, the curved glass may be a double curved surface or a four curved surface, and a bending angle of the curved glass may be greater than 80 °, specifically, for example, the four curved glass with a bending angle of 88 ° or 90 °, and a double-curved glass with a bending angle of 120 ° or even 160 °, so that not only can the surface strength of the casing be higher and the appearance be more fashionable, but also the more the number of the bending sides of the curved glass is, and the larger the bending angle is, the greater the difficulty of the process when the curved glass is attached is. It should be noted that, referring to fig. 3, the term "bending angle" in this context specifically refers to an included angle α between an outer tangent of an arc edge of the curved glass and an extension line of the plane portion. In some specific examples, referring to fig. 5 (b), with the manufacturing method of the present application, after the texture layer is attached to the inner surface of the four-curved-surface glass with the bending angle of 88 ° or 90 °, the film is coated and the ink is sprayed, the curved-surface glass with the large bending angle does not have any wrinkles or bubbles, so that the yield of the manufacturing method is improved by 20%.

Specifically, a suitable glass material (such as GG3, GG5, and GG6 of corning, DT Pro and DT Star of AGC, etc.) may be selected in advance, and 3D white glass sheets may be processed through the steps of cutting, numerical control machining (CNC), hot bending, polishing, tempering, cleaning, etc., and then bonded on the concave surface thereof.

In some embodiments of this application, the temperature of laminating can be 80 ~ 120 degrees centigrade, so, can make the hot melt adhesive layer between soft diaphragm 200 and the curved surface casing body 100 fully melt the back to make the cohesion between soft diaphragm 200 and the curved surface casing body 100 better, thereby make tectorial membrane curved surface glass's anti falling performance better.

In some embodiments of the present application, after the step of attaching, a defoaming treatment may be further performed, and the temperature of the defoaming treatment may be 80 to 120 degrees celsius, the pressure may be 6 to 15kg, and the time may be 30 to 60 minutes, so that the attached product is defoamed by using a defoaming furnace, so that the hot melt adhesive on the film is melted and sufficiently bonded with the curved glass, and further the anti-falling performance of the film-coated curved glass is better.

S300: and forming an optical film layer on the surface of the texture layer far away from the curved surface shell body.

In this step, referring to fig. 2 (c), after the lamination in step S200, the texture layer 300 is far away from the surface of the curved surface housing body 100, and the optical film layer 400 may be formed by a coating method, so that various brightness enhancement films and color films may be coated, the coating thickness may be more than 400nm, and the problem that the inorganic coating layer is most likely to crack does not exist, and after the coating, the coating is performed by matching with various colors of ink, so as to obtain coated curved surface glass with various color effects and high glare brightness.

According to the embodiment of the present application, the coating method for forming the optical film layer 400 may be a magnetron sputtering coating method or an evaporation coating method. When magnetron sputtering coating is adopted, Nb can be adopted for the film layer design₂O₅/SiO₂The multilayer film system structure of (1) can adopt TiO if evaporation coating is adopted₂/SiO₂The multilayer film system structure of (1); each film layer can be a uniform film with uniform thickness, or a gradual-change film layer with gradually increased or decreased thickness in a certain direction can be formed on the surface of the glass by setting different distances between the glass and the target or adopting a shielding jig mode.

S400: and forming an ink layer on the surface of the optical film layer far away from the curved surface shell body.

In this step, referring to fig. 2 (d), the optical film layer 400 manufactured in step S300 is far away from the surface of the curved surface housing body 100, and the ink layer 500 may be formed by spraying and curing, so that the ink layer 500 is sprayed on the soft film after being attached, and the ink layer 500 does not extrude the TPU soft film, thereby avoiding the problems of orange peel and concave-convex points; if the printing ink is firstly printed and then attached, the attaching Pad extrudes the membrane during attaching, and the extrusion is formed under a high-pressure environment during defoaming, so that the surface defects of the printing ink layer are reflected on the front surface of the film-coated curved glass.

Specifically, the sprayed ink may be thermosetting ink, UV curable ink, or yellow ink, and the yellow ink may be developed to produce different color effects in different areas through exposure. The ink is cured by an IR or thermal oven or tunnel oven, at 60-100 deg.C for 30-60 min.

In some embodiments of the application, ultrasonic cleaning can be reduced for the film-coated curved glass after the ink layer 500 is formed, so that the surface of a product is clean and has no water stain, and the appearance quality and the adhesive force during film coating are ensured; further plating an anti-fingerprint layer on the convex surface of the glass in a magnetron sputtering coating or evaporation coating mode, so that the contact angle of water drops on the convex surface of the film-coated curved glass is larger than 110 degrees.

In summary, according to the embodiments of the present application, a manufacturing method is provided, in which a texture layer is formed on one surface of a soft membrane, and then the other surface is attached to a concave surface of a curved shell body, and then an optical film layer is coated, and an ink layer is sprayed and cured, so that an appearance effect of gorgeous texture can be produced on the curved shell body with a large bending angle, and the problems of cracking of a coating layer, orange peel, concave and convex points and the like easily occurring when the curved shell body with a large bending angle is coated with a film can be effectively solved, thereby significantly improving the overall texture and the manufacturing yield of an electronic device.

In another aspect of an embodiment of the present application, a film-covered curved shell is provided. According to the embodiment of the application, the film-coated curved shell is manufactured by the method.

In summary, according to the embodiments of the present application, a film-coated curved surface casing is provided, in which a texture layer is formed on a soft film, the soft film is attached to a concave surface of a curved surface casing body, and then an optical film layer is coated and a printing ink layer is sprayed and cured, so that the problems of cracking of a coating layer, orange peel, concave and convex points and the like easily occurring when the optical film layer is attached to the curved surface casing body with a large bending angle can be avoided, and thus the film-coated curved surface casing has a gorgeous texture effect and can have better overall texture and higher yield. It will be appreciated by those skilled in the art that the features and advantages described above with respect to the method of making a laminated curved shell are still applicable to the laminated curved shell and will not be described in detail herein.

In another aspect of an embodiment of the present application, a housing of an electronic device is provided. According to an embodiment of the application, at least part of the shell is the film-coated curved shell.

According to the embodiments of the present application, in addition to the film-coated curved surface housing described above, the electronic device may further include other components, taking a mobile phone as an example, the housing may include a battery cover, a glass cover plate, and the like, and those skilled in the art may select and supplement the electronic device according to the specific type of the electronic device, which is not described herein again.

In summary, according to the embodiments of the present application, a housing of an electronic device is provided, which has an appearance with a gorgeous texture effect, a better overall appearance texture and a higher manufacturing yield, so that the housing has a richer appearance effect and a lower cost. Those skilled in the art will appreciate that the features and advantages described above with respect to the film-covered curved housing are applicable to the housing of the electronic device and will not be described in detail herein.

In another aspect of an embodiment of the present application, an electronic device is provided. According to an embodiment of the present application, referring to fig. 4, the electronic device 1 includes the housing 10 and the display device 20 described above, and the display device 20 is connected to the housing 10.

According to the embodiment of the application, the specific type of the electronic device is not particularly limited, specifically, for example, a mobile phone, a tablet computer, a smart watch, and the like, and those skilled in the art may select the electronic device according to the specific application of the electronic device, which is not described herein again. It should be noted that, besides the above-mentioned housing and display device, the electronic device further includes other necessary components and structures, specifically, for example, a mobile phone, such as a processor, a memory, a battery, a circuit board, a camera, and the like, and those skilled in the art can design and supplement the electronic device according to the specific type of the electronic device, and details are not described herein again.

In summary, according to the embodiments of the present application, an electronic device is provided, in which a housing has an appearance effect of gorgeous texture and is lower in cost, so that the market competitiveness of the electronic device is better. It will be appreciated by those skilled in the art that the features and advantages described above with respect to the housing of the electronic device, which are not described in detail herein, still apply to the electronic device.

The invention will now be described with reference to specific examples, which are intended to be illustrative only and not to be limiting in any way.

Example 1

In this example, a glass battery cover with a glare textured appearance was fabricated. Wherein, the curved glass is a hyperboloid with a bending angle of 120 degrees, the texture layer is line texture with a line width of 50 microns and a line distance of 50 microns, and the coating structure adopts TiO₂/SiO₂The ink layer is white and has a homogeneous film layer with a total thickness of about 500 nm. Thus, the glass battery cover manufactured by the embodiment has a blue appearance effect.

Example 2

In this example, a glass battery cover with a glare textured appearance was fabricated. Wherein, the curved glass is a hyperboloid with a bending angle of 160 degrees, the texture layer is line texture with a line width of 50 microns and a line distance of 50 microns, and the coating structure adopts TiO₂/SiO₂The multi-layer structure is a homogeneous film layer with the total thickness of about 700nm, and the ink layer is white. Thus, the glass battery cover manufactured in this example has a purple appearance.

Example 3

In this example, a glass battery cover with a glare textured appearance was fabricated. Wherein, the curved glass is four curved surfaces with bending angle of 88 degrees, the texture layer is line texture with line width of 50 microns and line distance of 50 microns, and the coating structure adopts TiO₂/SiO₂The multi-layer structure is a gradient film layer with the total thickness of about 500nm, and the ink layer is white. Thus, the glass manufactured in this exampleThe glass battery cover has a gradual appearance effect that one side of the glass battery cover is blue and the other side of the glass battery cover is purple.

Example 4

In this example, a glass battery cover with a glare textured appearance was fabricated. Wherein, the curved glass is four curved surfaces with bending angle of 90 degrees, the texture layer is line texture with line width of 50 microns and line distance of 50 microns, and the coating structure adopts TiO₂/SiO₂The multi-layer structure is a gradient film layer with the total thickness of about 500nm, and the ink layer is white. Thus, the glass battery cover manufactured by the embodiment has a gradual appearance effect of one side being blue and the other side being purple.

In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.

Claims

1. A method of making a film-covered curved shell, comprising:

forming a texture layer on the surface of the soft membrane;

attaching the surface of the soft membrane far away from the texture layer to the concave surface of the curved surface shell body;

forming an optical film layer on the surface of the texture layer far away from the curved surface shell body;

forming an ink layer on the surface of the optical film layer, which is far away from the curved surface shell body;

wherein, soft diaphragm is kept away from the surface on texture layer is provided with the hot melt adhesive layer, the temperature of laminating is 80 ~ 120 degrees centigrade.

2. The method of claim 1, wherein the material forming the soft film comprises thermoplastic polyurethane.

3. The method of claim 1, wherein after the step of forming the textured layer, a protective layer is further formed on a surface of the textured layer remote from the soft film sheet.

4. The method of claim 1, wherein the curved housing body is curved glass and the curved glass has a bend angle greater than 80 °.

5. The method of claim 1, wherein the curved housing body is a four-sided curved glass, and the curved glass has a bending angle of 80 ° to 90 °.

6. The method according to claim 1, wherein a defoaming treatment is further performed after the bonding step, and the defoaming treatment is performed at a temperature of 80 to 120 degrees celsius, at a pressure of 6 to 15kg, and for a time of 30 to 60 minutes.

7. A film-coated curved shell, which is manufactured by the method of any one of claims 1 to 6.

8. A housing for an electronic device, wherein at least a portion of the housing is the film-covered curved housing of claim 7.

9. An electronic device, comprising:

the housing of claim 8;

a display device coupled to the housing.