WO2021000879A1 - Structural member, structural member fabrication method and electronic device - Google Patents

Abstract

A structural member fabrication method, a structural member and an electronic device, the fabrication method comprising the following steps: step S110: fabricating a substrate (110), the substrate (110) being a high-transmittance substrate; step S120: fabricating a diaphragm (300), and preparing a coating (130) on one side of the diaphragm (300) by means of inkjet printing; step S130: placing the substrate (110) and the diaphragm (300) that has the coating (130) in a mold, the coating (130) facing the inner surface of the substrate (110); and step S140: clamping the mold and vacuuming, so that the coating (130) located on the diaphragm (300) is transferred to one side of the inner surface of the substrate (110).

Description

Structural parts, manufacturing method of structural parts and electronic equipment Technical field

This application relates to the technical field of electronic equipment, and in particular to a structural component, a manufacturing method of the structural component, and electronic equipment.

Background technique

Ceramic or glass structural parts are widely used in electronic equipment. The blanks of ceramic or glass structural parts are usually in one color, such as black, white, red, blue, etc., and the appearance is relatively monotonous; on the surface of ceramic or glass structural parts Using spraying or physical vapor deposition (PVD) to paint other colors, the wear resistance of the ceramic structure surface is reduced, and the hand feel is poor.

Summary of the invention

Based on this, it is necessary to provide a structure, a manufacturing method of the structure, and an electronic device.

A manufacturing method of structural parts includes the following steps:

Step S110, fabricating a substrate, the substrate being a high permeability substrate;

Step S120, making a diaphragm, and preparing a coating on one side of the diaphragm by inkjet printing;

Step S130, placing the substrate and the film with the coating in a mold, the coating facing the inner surface of the substrate;

Step S140, closing the mold and vacuuming, so that the coating on the diaphragm is transferred to one side of the inner surface of the substrate.

A structural member is produced by the manufacturing method of the structural member.

An electronic device includes a structural member obtained by the manufacturing method of the structural member.

Description of the drawings

In order to more clearly describe the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present application. For those of ordinary skill in the art, the drawings of other embodiments can be obtained based on these drawings without creative work.

Figure 1 is a perspective view of an electronic device provided by an embodiment;

2 is a perspective view of the battery cover of the electronic device shown in FIG. 1;

Figure 3 is a cross-sectional view of the battery cover shown in Figure 2;

Figure 4 is a production flow chart of the battery cover provided by an embodiment;

Fig. 5 is a production flow chart of a substrate provided by an embodiment;

6 is a manufacturing process diagram of the battery cover provided by an embodiment, in which the coating on the diaphragm is to be transferred to the substrate;

FIG. 7 is a manufacturing process diagram of the battery cover shown in FIG. 6, in which the coating on the diaphragm is transferred to the substrate;

8 is a cross-sectional view of the substrate in step S110 in the production flow chart shown in FIG. 4;

Figure 9 is a cross-sectional view of the substrate shown in Figure 8, wherein the inner surface of the substrate is provided with a paint layer;

Figure 10 is a cross-sectional view of the structure shown in Figure 9, in which a coating is transferred onto the lacquer layer;

Figure 11 is a cross-sectional view of the structure shown in Figure 10, in which the coating penetrates the paint layer;

Fig. 12 is a production flow chart of a battery cover provided by another embodiment.

Detailed ways

In order to facilitate the understanding of the application, the application will be described in a more comprehensive manner with reference to the relevant drawings. The drawings show preferred embodiments of the application. However, this application 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 understanding of the disclosure of this application more thorough and comprehensive.

As shown in FIGS. 1 and 2, in an embodiment, an electronic device 10 is provided, and the electronic device 10 may be a smart phone, a computer, or a tablet. The electronic device 10 includes a display screen assembly 200, a structural member, a middle frame, and a circuit board. The material of the structural member may be ceramic or glass. In this application, the battery cover 100 made of ceramic is used as an example to introduce the structural member. It is understandable that the structural member may also be a middle frame, a button, a camera decoration ring, a fingerprint decoration ring, etc.; in another embodiment, the structural member may also be a middle frame and rear frame of a unibody structure. Cover one-piece form. The display assembly 200 and the battery cover 100 are respectively fixed on both sides of the middle frame. The display assembly 200, the middle frame and the battery cover 100 together form the external structure of the electronic device 10. The circuit board is located inside the electronic device 10, and the circuit board is integrated with Electronic components such as controllers, storage units, power management units, and baseband chips. The display screen assembly 200 is used to display pictures or fonts, and the circuit board can control the operation of the electronic device 10.

In one embodiment, the display assembly 200 adopts an LCD (Liquid Crystal Display) screen for displaying information. The LCD screen may be a TFT (Thin Film Transistor) screen or an IPS (In-Plane Switching) screen. ) Screen or SLCD (Splice Liquid Crystal Display) screen. In another embodiment, the display assembly 200 uses an OLED (Organic Light-Emitting Diode, organic electro-laser display) screen for displaying information, and the OLED screen may be AMOLED (Active Matrix Organic Light-Emitting Diode, active matrix organic light emitting diode). Polar body) screen or Super AMOLED (Super Active Matrix Organic Light Emitting Diode) screen or Super AMOLED Plus (Super Active Matrix Organic Light Emitting Diode Plus, magic screen) screen. Under the control of the controller, the display screen assembly 200 can display information and can provide an operation interface for the user.

As shown in FIG. 3, in an embodiment, the battery cover 100 includes a substrate 110, a coating 130, a paint layer 120 and a primer 140. The material of the substrate 110 is high-transmittance ceramics, and the light transmittance of the substrate 110 is not less than 1%, and can be 1% to 2%, so that the substrate 110 has a high-transmittance effect. The substrate 110 includes an outer surface 111 and an inner surface 112. The outer surface 111 is a surface of the substrate 110 facing away from the display screen assembly 200, and the inner surface 112 is a surface of the substrate 110 facing the inside of the electronic device 10. The inner surface 112 is provided with a coating layer 130 and a lacquer layer 120. The lacquer layer 120 is sprayed with transparent polyurethane coating, that is, PU liquid paint, so that the light transmittance of the lacquer layer 120 is not less than 75% and can be 100%. The thickness of the lacquer layer 120 is 10 μm, and the lacquer layer 120 has high gloss and no defects such as pinhole pitting. The coating 130 may include patterns or fonts, etc. The coating 130 penetrates into the paint layer 120, and the gloss of the paint layer 120 is equal, which can well show the spinning and color of the coating 130, so that the inner surface 112 of the substrate 110 has a relatively high Good decorative effect. The coating 130 can be exposed from one side of the outer surface 111 through the transparent lacquer layer 120 and the substrate 110 with high permeability, so that the battery cover 100 has a ceramic feel and a better decorative effect. The coating 130 is located on one side of the inner surface 112 of the substrate 110, and the user will not touch the coating 130 when using the electronic device 10, so that the coating 130 will not be scratched or damaged, and the service life will be increased. The primer 140 is located on the side of the paint layer 120 facing away from the substrate 110 and is formed by spraying white ink. The thickness of the primer 140 is 10 μm to 15 μm. The primer 140 is opaque and is covered with a coating 130, so that the coating 130 can be refracted through the paint layer 120 with higher light transmittance and the substrate 110, so that the user can view from the side of the outer surface 111 of the substrate 110 It is observed that the coating 130 improves the aesthetics of the electronic device 10.

As shown in FIG. 4, in an embodiment, a method for manufacturing a structural member is provided, including:

Step S110, fabricating the substrate 110;

In step S120, the diaphragm 300 is produced, and the coating 130 is produced by inkjet printing on the diaphragm 300;

Step S130, placing the substrate 110 and the film 300 with the coating 130 in the mold, with the coating 130 facing the inner surface 112 of the substrate 110;

In step S140, the mold is closed and evacuated, so that the coating 130 on the diaphragm 300 is transferred to one side of the inner surface 112 of the substrate 110.

As shown in FIG. 5, in one embodiment, the ceramic powder is mixed with the binder, and the ceramic green body is prepared by injection molding or casting or dry pressing. The ceramic green body is debinding and sintered to obtain the substrate 110. Specifically, according to the ceramic type of the substrate 110, the ceramic powder may include alumina powder, zirconia powder, or zirconium nitride powder and corresponding mixtures, and the powder purity is above 99.99%. The binder may use one or more of paraffin, polyethylene glycol, stearic acid, dioctyl phthalate, polyethylene, polypropylene, polymethyl methacrylate, and polyformaldehyde. The mass percentage of the ceramic powder is 70% to 99%, and the mass percentage of the adhesive is 1% to 30%, depending on the selected ceramic preparation process. In another embodiment, in order to increase the light transmittance of the substrate 110, the mass percentage of the alumina powder can be reduced, so that the mass percentage of the alumina powder is less than 0.25%, which can increase the light transmittance of the substrate 110. rate. In another embodiment, by reducing impurities in the ceramic powder and adhesive, and reducing the number of pores during injection molding, tape casting, or dry pressing, the light transmittance of the substrate 110 can be increased.

As shown in Fig. 5, in one embodiment, the ceramic green body is placed in the debinding box for debinding or degreasing, the debinding or degreasing temperature is controlled below 400°C, and the time is controlled within 0.5h-4h. After degumming or degreasing, the sample has no distortion, no cracking, no abnormal color and other problems. The debinding ceramic green body is placed in a sintering furnace, and sintered in a reducing or oxidizing or inert atmosphere to obtain a ceramic green body. The sintering temperature is greater than 1200°C, and the sintering time is 0.5h-10h. The ceramic body prepared under the above-mentioned debinding and degreasing process parameters can achieve the state of the smallest pores, the largest shrinkage, the densest product, and the best performance. The ceramic body is subjected to post-treatment to obtain the substrate 110. The post-processing includes grinding and polishing the ceramic body obtained after sintering, and performing CNC processing to make the substrate 110 meet the size requirements, and to detect the surface quality of the substrate 110.

In an embodiment, a logo is prepared on the inner surface 112 of the substrate 110 by a screen printing method or a physical vapor deposition method, and the logo may be a text or a pattern. The logo can be exposed from one side of the outer surface 111 of the substrate 110 through the highly transparent substrate 110, so that the battery cover 100 has a logo.

In one embodiment, a transparent lacquer layer 120 is formed on the inner surface 112 of the high-permeability substrate 110, and the coating 130 is formed on the lacquer layer 120 by inkjet printing. Use software to make effect diagrams, analyze and determine the inkjet volume through the effect diagrams, and spray ink on the diaphragm through inkjet printing to form the same coating layer 130 as the effect diagram, that is, the pattern and color of the coating layer 130 are the same as the effect The figure is the same. The film is attached to the lacquer layer 120 so that the coating 130 is transferred to the lacquer layer 120 and the film is peeled off to obtain the substrate 110, the lacquer layer 120 located on the inner surface 112 of the substrate 110, and the infiltrated lacquer layer 120 The structural component of the coating 130 is the battery cover 100. The outer surface of the battery cover 100 has a ceramic feel, and the battery cover 100 has a better decorative effect.

As shown in Figures 8 and 9, in one embodiment, PU liquid paint (polyurethane paint) is sprayed on the inner surface 112 of the substrate 110, and the thickness of the formed paint layer 120 is 10 μm, and the paint layer 120 is high-gloss and needle-free. Defects such as hole pitting. The light transmittance of the lacquer layer 120 is not less than 75%, and the gloss of the lacquer layer 120 is uniform, which can well show the spinning and color of the coating 130, so that the inner surface 112 of the substrate 110 has a better decorative effect. In another embodiment, the lacquer layer 120 may not be provided on the inner surface 112 of the substrate 110, and the coating 130 can be directly transferred to the inner surface 112 of the substrate 110, which can also make the structural member have a ceramic feel and Has a good decorative effect.

In one embodiment, in step S120, the diaphragm 300 is produced. The diaphragm 300 is made of a transparent material, so that the light transmittance of the diaphragm 300 is not less than 75%. In one embodiment, the film 300 may be made of transparent PET (Polyethylene terephthalate, polyethylene terephthalate). In another embodiment, the material of the membrane 300 can also be PO (polyolefin), A-PET (Amorphous Polyethylene Terephthalate), PETG (polyethylene terephthalate), Ethylene Dicarboxylate-1,4-cyclohexanedimethanol), PC (Polycarbonate, polycarbonate), PMMA (Polymethyl methacrylate, polymethyl methacrylate), etc. In another embodiment, the membrane 300 can also be a dedicated inkjet thermal transfer paper. The section of the inkjet thermal transfer paper includes a three-layer structure. On the top layer is a functional coating 130 that absorbs ink and separates dyes, and is located in the middle. The layer is base paper, and the bottom layer is a coating 130 that resists warpage.

In one embodiment, in step S120, software is used to make an effect map of the coating 130. The effect picture can be a color effect picture or a pattern effect picture with pictures or fonts. In another embodiment, the effect picture may also be a texture, which is not specifically limited here. The rendering of the coating 130 is generally made by Photoshop or Adobe Illustrator (AI) software or Croeldraw software. In another embodiment, the rendering of the coating 130 can also be made by other software. The rendering includes multiple color blocks. By analyzing the proportions of cyan ink (C), magenta ink (M), yellow ink (Y) and black ink (K) in a single color block, a single color block is analyzed CMYK parameters are used to determine the ink ejection volume of the specific color ink required at a specific position of the diaphragm 300. In the color gradient area of the effect picture, the gradual change of the color is realized by controlling the proportion of the droplets of different colors of ink to gradually increase or decrease, and to prevent the sudden change of color. Use high-precision inkjet printers for inkjet printing. The inkjet printer includes at least 4 nozzles, and cyan ink, magenta ink, yellow ink and black ink respectively correspond to at least one nozzle. The spray head can move within the range of the substrate 110. It can be understood that the spray head can move and eject ink according to a program set after the software analyzes the effect map to form the coating 130 on the substrate 110. The diameter of the droplets ejected by the nozzle is not greater than 20um. A single color block of the coating 130 can include ink of one color or multiple colors of ink. Different colors of ink can be superimposed to form inks of other colors. . The print head performs inkjet according to the proportions of the various color inks in a single color block determined by the software after analyzing the renderings to form a coating 130 that is the same as the rendering. The pattern and color of the coating 130 are the same as the rendering.

In another embodiment, in order to improve the fineness of colors, the ink further includes low-concentration cyan ink, low-concentration red ink, and low-concentration yellow ink. A high-precision inkjet printer with at least 7 nozzles is required. Cyan ink, magenta ink, yellow ink, black ink, low-concentration cyan ink, low-concentration red ink and low-concentration yellow ink correspond to at least one nozzle respectively. The nozzle can move within the range of the surface of the substrate 110. It can be understood that the nozzle can move and eject ink according to a program set after the software analyzes the effect map, and the coating 130 is formed on the surface of the substrate 110. The diameter of the droplets ejected by the nozzle is not greater than 20um. A single color block of the coating 130 can include ink of one color or multiple colors of ink. Different colors of ink can be superimposed to form inks of other colors. . The nozzle jets ink according to the proportion of the various color inks in a single color block determined by the software after analyzing the renderings to form the same coating as the renderings.

Among them, the pixels presented by the coating 130 are determined by the number and accuracy of the nozzles of the inkjet printer. The thickness of the coating layer 130 is 2 μm to 3 μm. In other embodiments, the coating 130 may also be printed on the film 300 using printing methods such as screen printing, gravure printing, or the like. As shown in FIGS. 6, 7 and 10, in one embodiment, a mold is prepared. The mold includes an upper mold and a lower mold 410, and the upper mold and the lower mold 410 are processed by aluminum alloy CNC machining. The upper mold and the lower mold 410 are designed and processed according to the 3D drawing of the base material 110 to ensure that the diaphragm 300 and the base material 110 can be fixed after the mold is closed. The upper mold and the lower mold 410 of the mold are preheated to 150° C. to 170° C., the substrate 110 is placed on the lower mold 410, and the outer surface 111 of the substrate 110 is attached to the cavity of the lower mold 410. The film 300 with the coating 130 is covered on the substrate 110, and the coating 130 faces the inner surface 112 of the substrate 110. The upper mold and the lower mold 410 are closed, and a vacuum is applied to generate a negative pressure with a pressure of 0-0.05 MPa, so that the diaphragm 300 is tightly wrapped on the inner surface 112 of the substrate 110. At the same time, the heat preservation temperature of the cavity of the mold is 150℃～170℃, and the heat preservation time is 30s～60s. As shown in Figures 10 and 11, the effect of temperature and pressure ensures that the ink of the coating 130 penetrates into the lacquer layer 120 formed of PU liquid paint on the surface of the substrate 110, so that the coating 130 on the membrane 300 is transferred to The purpose of the lacquer layer 120 on the inner surface 112 of the substrate 110. The film is then peeled off from the substrate 110.

As shown in FIG. 12, in one embodiment, step S150 is included to spray ink on the side of the paint layer 120 away from the substrate 110 to form the primer 140. Specifically, a spray gun is used to spray white ink on the side of the paint layer 120 away from the substrate 110 to form the primer 140. In the white ink, the mass percentage of varnish is 50%-60%, and the mass percentage of the curing agent It is 15%-40%, and the mass percentage of the diluent is 10%-30%. The viscosity of the white ink is 8Pa.s～12Pa.s. The distance between the spray gun and the substrate 110 is 10 cm, the sample rotation speed is 10-60°/s, the spraying speed is 600 mm/s, the ink supply pressure is 200 Pa, the atomization pressure is 300 Pa, and the spray pressure is 350 Pa. The sprayed white ink is baked at a temperature of 80°C to 90°C, and a baking time of 50min to 60min, so that the thickness of the white ink is 10μm-15μm, that is, the thickness of the primer 140 is 10μm-15μm. In another embodiment, an explosion-proof film is pasted on the side of the primer 140 away from the substrate 110 to prevent fragments from splashing when the battery cover 100 is broken.

The battery cover 100 prepared in the present application includes a highly transparent substrate 110, a transparent paint layer 120, a coating 130 penetrating into the paint layer 120, and a primer 140. The outer surface of the battery cover 100 is the outer surface 111 of the substrate 110, so that the battery cover 100 has a better ceramic feel and higher wear resistance. The lacquer layer 120, the coating layer 130 and the primer 140 are located on the side of the inner surface 112 where the battery hangs. The coating layer 130 is protected by the substrate. The coating layer 130 is refracted to the battery through the transparent lacquer layer 120 and the highly transparent substrate 110 On one side of the outer surface of the cover 100, under the condition of improving the aesthetics of the battery cover 100, the coating 130 will not be worn and there is no risk of falling off, so that the service life of the coating 130 is prolonged. The coating 130 is designed by software and printed on the battery cover 100 by inkjet printing and transfer printing, which has better appearance and designability than direct spraying, making the coating 130 of the battery cover 100 and software design effect Consistent, enriches the decorative effect of the battery cover 100, and improves the yield rate.

The technical features of the above-mentioned embodiments can be combined arbitrarily. In order 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, All should be considered as the scope of this specification.

The above-mentioned embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the scope of the invention patent. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of this application, several modifications and improvements can be made, and these all fall within the protection scope of this application. Therefore, the scope of protection of the patent of this application shall be subject to the appended claims.

Claims (20)

A manufacturing method of structural parts includes the following steps: Step S110, fabricating a substrate, the substrate being a high permeability substrate; Step S120, making a diaphragm, and preparing a coating on one side of the diaphragm by inkjet printing; Step S130, placing the substrate and the film with the coating in a mold, the coating facing the inner surface of the substrate; Step S140, closing the mold and vacuuming, so that the coating on the diaphragm is transferred to one side of the inner surface of the substrate. The method for manufacturing a structural member according to claim 1, wherein in step S110, the ceramic powder is mixed with the binder, and the ceramic green body is prepared by injection molding, casting, or dry pressing. The method of manufacturing a structural member according to claim 2, wherein the ceramic powder comprises zirconium oxide powder or zirconium nitride powder; the adhesive comprises paraffin, polyethylene glycol, stearic acid, ortho One or more of dioctyl phthalate, polyethylene, polypropylene, polymethyl methacrylate, and polyoxymethylene. The manufacturing method of the structural member according to claim 2, wherein the substrate is prepared by debinding and sintering the green ceramic body. The manufacturing method of the structural member according to claim 1, wherein in step S120, an effect diagram is produced, and the inkjet volume is analyzed and determined through the effect diagram; and inkjet printing is performed on the diaphragm The ink is jetted to form the coating that is the same as the effect diagram. The manufacturing method of the structural member according to claim 1, characterized by comprising step S115, spraying polyurethane paint on the inner surface of the substrate to form a paint layer with a light transmittance of not less than 75%. The manufacturing method of the structural member according to claim 6, wherein in step S130, the mold includes an upper mold and a lower mold, and the upper mold and the lower mold are preheated to 150°C to 170°C; The substrate is placed in the lower mold, the outer surface of the substrate is attached to the cavity of the lower mold, and the film with the coating is placed on the lower mold and covered On the inner surface of the substrate, the coating faces the paint layer. The manufacturing method of the structural member according to claim 6, characterized in that, in step S140, the mold is closed, vacuumed and insulated, the coating is transferred to the paint layer; the film is peeled off sheet. The manufacturing method of the structural member according to claim 8, characterized by comprising step S150, spraying ink on the side of the paint layer away from the substrate to form a primer. The manufacturing method of the structural member according to claim 1, wherein the light transmittance of the substrate is not less than 1%. A structural member made by the manufacturing method of the structural member according to any one of claims 1-10. The structure according to claim 11, wherein the structure is a battery cover or a middle frame or an integrally formed battery cover and middle frame. The structure according to claim 11, characterized in that the ceramic powder is mixed with the binder, and the ceramic green body is obtained by injection molding, flow casting or dry pressing, and the ceramic green body is debinding, Sintering to prepare the substrate. The structure according to claim 11, wherein the coating is used to determine the amount of ink ejected by an effect diagram, and is formed on the film by means of inkjet printing, and then transferred to the inside of the substrate Made on the surface. The structural member according to claim 14, wherein the inner surface of the substrate is provided with a paint layer with a light transmittance of not less than 75%, and the coating layer is transferred to the paint layer. The structural member according to claim 15, wherein the material of the paint layer is polyurethane paint. The structure according to claim 15, wherein the coating penetrates the paint layer. The structural member according to claim 17, wherein a primer is provided on a side of the paint layer away from the substrate, and the primer is formed of ink. The structural member according to claim 11, wherein the light transmittance of the substrate is not less than 1%. An electronic device, comprising a structural member produced by the method of manufacturing a structural member according to any one of claims 1-10.

Images