Intelligent terminal cover plate with micro-nano optical structure

Abstract

The utility model relates to the technical field of intelligent terminal cover plate processing, and particularly discloses an intelligent terminal cover plate with a micro-nano optical structure, which is easy to process, high in yield and low in processing cost, and comprises a transparent substrate and an annular optical structural member arranged on the back surface of the transparent substrate along the edge of the transparent substrate in an extending manner, the outer contour of the optical structural member is flush with the outer contour of the transparent substrate, and the optical structural member comprises a texture adhesive layer attached to the back face of the transparent substrate at least in a mold transfer printing mode and a first ink layer which is filled in a surface gap of the texture adhesive layer and forms a reflecting face. The ratio of the sum of the projection widths of the inclined planes or the cambered surfaces on the transparent substrate to the width of the texture adhesive layer is 1: 20-1: 5, the included angle between the inclined planes or the cambered surfaces and the back surface of the transparent substrate is 5-85 degrees, the thickness of the texture adhesive layer is 20-10000 nm, and the texture adhesive layer reflects light and forms a three-dimensional pattern on the front surface of the transparent substrate.

Description

Technical Field

[0001] The utility model relates to the technical field of intelligent terminal cover plate processing, in particular to an intelligent terminal cover plate with a micro-nano optical structure. Background Art

[0002] The intelligent terminal cover plate is arranged in the screen and rear cover areas of products such as mobile phones, tablet computers, and intelligent wearable devices (such as smart watches), and is used as the front cover or rear cover of the above-mentioned electronic products to protect the screen and rear cover. Due to the requirements of users for the appearance effect of the product, it is necessary to design the structure of the edge part of the cover plate so that the optical path changes when light irradiates the edge of the cover plate, and then the original planar light and shadow effect at the edge of the cover plate becomes a three-dimensional 2.5D light and shadow effect, thereby providing a special appearance effect for the product. At present, in the industry, a CNC (Computer number control) machine processing machine is mainly used to directly cut on sapphire. Specifically, a slope is cut along the outer edge of the inner surface of the sapphire (the side located inside the product) to change it from a 2D flat sheet to a 2.5D shape, and electroplating is carried out on the slope. Subsequently, an ink protection layer is screen-printed on the electroplated layer, and the formed sapphire is assembled onto the product to obtain the target product. However, in the case of adopting the above structure and processing method, due to the difficulty of sapphire processing, problems such as chipping and cracking are likely to occur during the cutting process, so the operation difficulty is high, the processing time is long, and the processing cost is high. In addition, due to the existence of the height difference of the sapphire slope, it will lead to difficult assembly of the finished product, and the assembly yield of the 2.5D slope product is lower than that of the ordinary 2D product. Summary of the Utility Model

[0003] Based on this, it is necessary to provide an intelligent terminal cover plate with a micro-nano optical structure that is easy to process, has a high yield rate, and low processing cost in view of the above deficiencies.

[0004] An intelligent terminal cover plate with a micro-nano optical structure, comprising a transparent substrate for forming the screen cover plate or the back cover of the intelligent terminal, and an annular optical structure member extending along the edge of the transparent substrate on the back surface of the transparent substrate; the outer contour of the optical structure member is flush with the outer contour of the transparent substrate, and the optical structure member includes at least an annular texture adhesive layer attached to the back surface of the transparent substrate and having a micro-nano optical structure. The texture adhesive layer has a first surface attached to the transparent substrate and a second surface facing away from the transparent substrate. The second surface of the texture adhesive layer is filled with a first ink layer for forming a reflective surface. At least one inclined surface or arc surface is provided at the second surface of the cross-section of the texture adhesive layer to form the micro-nano optical structure. The sum of the components of the inclined surface or arc surface in the projection on the back surface of the transparent substrate along the width direction of the cross-section of the texture adhesive layer and the width of the cross-section of the texture adhesive layer is between 1:20 and 1:5. The angle between the inclined surface and the back surface of the transparent substrate is between 5° and 85°. The texture adhesive layer reflects light and forms a three-dimensional pattern visual effect on the front surface of the transparent substrate.

[0005] In one embodiment, a plating layer is provided on the second surface of the texture adhesive layer, and the plating layer is located between the texture adhesive layer and the first ink layer.

[0006] In one embodiment, a second ink layer for reflecting light and forming a planar pattern on the front surface of the transparent substrate is provided between the inner side of the texture adhesive layer and the plating layer on the back surface of the transparent substrate, and the outer side surface of the texture adhesive layer is flush with the outer side surface of the transparent substrate.

[0007] In one embodiment, a third ink layer for reflecting light and forming a planar pattern on the front surface of the transparent substrate is provided between the outer side of the texture adhesive layer and the plating layer on the back surface of the transparent substrate, and the outer side surface of the third ink layer is flush with the outer side surface of the transparent substrate.

[0008] In one embodiment, a sawtooth area is provided on the surface of the texture adhesive layer facing away from the transparent substrate, and the sawtooth area includes a plurality of convex portions arranged continuously or at intervals.

[0009] In one embodiment, the bottom of the convex portion is spaced from the back surface of the transparent substrate by a preset distance, and the preset distance is greater than or equal to 0.

[0010] In one embodiment, the plurality of convex portions include a plurality of identical first triangular structures, and the inner angle of the first triangular structure facing away from the transparent substrate is greater than 90°; or the plurality of convex portions include a plurality of identical second triangular structures, and the inner angle of the second triangular structure facing away from the transparent substrate is less than 90°; or the plurality of convex portions include a plurality of identical third triangular structures, and the inner angle of the third triangular structure facing away from the transparent substrate is equal to 90°; or the plurality of convex portions include a plurality of first triangular structures, a plurality of second triangular structures, and a plurality of third triangular structures arranged according to a preset rule or arranged irregularly; or the plurality of convex portions include a plurality of fourth triangular structures, and the inner angles of the fourth triangular structures facing away from the transparent substrate increase or decrease in sequence; or the plurality of convex portions include a plurality of fifth triangular structures with heights increasing or decreasing in sequence; or the plurality of convex portions include a plurality of sixth triangular structures, the inner angles of the sixth triangular structures facing away from the transparent substrate increase or decrease in sequence, and the heights of the sixth triangular structures increase or decrease in sequence.

[0011] In one embodiment, the plurality of convex portions include a plurality of trapezoidal structures with the same or different shapes; or the plurality of convex portions include a plurality of parallelogram structures with the same or different shapes, and the parallelogram structures are non-rectangular structures; or the plurality of convex portions include a plurality of frustum-shaped structures with the same or different shapes.

[0012] In one embodiment, the plurality of convex portions include a plurality of arc-shaped structures or fan-shaped structures with the same or different shapes.

[0013] In one embodiment, an adhesion promoting layer is provided between the back surface of the transparent substrate and the texture adhesive layer.

[0014] When implementing the intelligent terminal cover plate with a micro-nano optical structure of the present invention, the texture adhesive layer is disposed on the transparent substrate by means of die transfer. The material of the transparent substrate is not limited to sapphire material, and other materials that are easy to process can also be selected, which increases the application range of the texture structure design, reduces the product processing difficulty; there is no need to perform secondary processing on the transparent substrate, avoiding damage to the product, facilitating the processing of subsequent processes, improving the product yield, and reducing the processing cost of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is the front view of the intelligent terminal cover plate in an embodiment of the present invention;

[0016] Figure 2 is the schematic cross-sectional structure view of the intelligent terminal cover plate in an embodiment of the present invention;

[0017] Figure 3 is the schematic optical path diagram of the intelligent terminal cover plate showing a three-dimensional pattern in an embodiment of the present invention;

[0018] Figure 4 Schematic diagram of the partial cross-sectional structure of the intelligent terminal cover plate in an embodiment of the present utility model;

[0019] Figure 5 Schematic diagram of the partial cross-sectional structure of the intelligent terminal cover plate in another embodiment of the present utility model;

[0020] Figures 6 - 19 Schematic diagram of the structure of the texture adhesive layer of the present utility model under various different deformations;

[0021] Figure 20 Processing flow chart when processing the mold by using a laser direct writing lithography machine in an embodiment of the present utility model;

[0022] Figure 21 Processing flow chart when processing the mold by using an ultra-precision CNC machine tool in an embodiment of the present utility model;

[0023] Figure 22 Processing flow chart of the UV transfer process in an embodiment of the present utility model;

[0024] Figure 23 Schematic diagram of the product structure after electroplating in an embodiment of the present utility model;

[0025] Figure 24 Schematic diagram of the product structure after screen printing ink in an embodiment of the present utility model. Detailed implementation manners

[0026] In order to make the above objects, features, and advantages of the present utility model more obvious and understandable, the following will describe the detailed implementation manners of the present utility model in conjunction with the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present utility model. However, the present utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed below.

[0027] The present utility model aims at the traditional method of converting a 2D plane into a 2.5D structure by using sapphire cutting. When a three-dimensional pattern effect is generated on the user surface of the product after being reflected by the reflecting surface under light irradiation, due to problems such as easy chipping, damage, difficult processing, and low yield rate in sapphire cutting, an intelligent terminal cover plate with a micro-nano optical structure is provided. The intelligent terminal cover plate sets a texture adhesive layer with a micro-nano optical structure on a transparent substrate such as sapphire by means of mold transfer to generate a three-dimensional visual effect.

[0028] Such as Figures 1 - 3, the cover plate of the intelligent terminal in this embodiment includes a transparent substrate 100 for forming the screen cover plate or the back cover of the intelligent terminal, and an annular optical structure member 101 extending along the edge of the transparent substrate 100 on the back surface of the transparent substrate 100. The edge here is the edge of the cover plate, and the annular shape here has a certain width. According to different design sizes and shapes, the cover plate of the intelligent terminal can be used as the screen cover plate (i.e., the front cover) of mobile phones, pads, desktop or laptop computers, and intelligent wearable devices, etc., or can also be used for the back cover plate (i.e., the back cover) of the above products. Preferably, the cover plate of the intelligent terminal in this embodiment is used as the screen cover plate of the smart watch. The transparent substrate 100 is used to be installed on the product and used as the screen cover plate or the back cover of the product, and at the same time is also used to attach the optical structure member 101; the optical structure member 101 is used to design a micro-nano optical structure so that under the illumination of light, it is reflected by the reflective layer, so as to form a three-dimensional pattern on the front surface of the transparent substrate 100. In this embodiment, the outer contour shape of the optical structure member 101 is adapted to the outer contour shape of the transparent substrate 100.

[0029] In this embodiment, the transparency of the transparent substrate 100 is less than or equal to 100%, that is, a colorless and fully transparent substrate can be used as the transparent substrate 100, or a semi-transparent substrate 100 with a predetermined color can be used as the transparent substrate 100, which is specifically determined according to the function of the cover plate of the intelligent terminal. When the cover plate of the intelligent terminal is used as the screen cover plate, the transparency of the transparent substrate 100 is based on the user's ability to clearly see the content on the screen when using it. According to different materials selected, the transparent substrate 100 can be a sapphire substrate, or a glass plate, or a PC plate, or an inorganic composite plate. Preferably, the transparent substrate 100 in this embodiment is made of sapphire material. In addition, both the front surface (the side facing the user when in use) and the back surface (the side located inside the product and facing away from the user when in use) of the transparent substrate 100 are flat surfaces, the area between the front surface and the back surface of the transparent substrate 100 is a body, and rounded corners or chamfers are respectively provided at the transition parts between the front surface of the transparent substrate 100 and the body and between the back surface of the transparent substrate 100 and the body. The size of the rounded corners or chamfers is 0.01 - 0.2 mm, and the body is a smooth and flat surface. Further, the roughness of the back surface of the transparent substrate 100 is 0.01 - 0.1 mm, its surface water contact angle < 100°, and the surface flatness ≤ 0.02 mm, so as to facilitate the texture adhesive layer on the optical structure member 101 to be evenly and flatly attached to the surface of the transparent substrate 100, and when the optical structure member 101 is attached to the transparent substrate 100, the texture adhesive layer on the optical structure member 101 can overflow onto the body, which is beneficial to the more uniform manifestation of the three-dimensional visual effect.

[0030] The outer contour of the optical structure 101 is flush with the outer contour of the transparent substrate 100. The optical structure 101 includes a ring-shaped textured adhesive layer 200 attached to the back of the transparent substrate 100 by at least mold transfer and having a micro-nano optical structure. The textured adhesive layer 200 has a first surface bonded to the transparent substrate 100 and a second surface facing away from the transparent substrate 100. The second surface of the textured adhesive layer 200 is filled with a first ink layer 300 for forming a reflective surface. The cross-section of the textured adhesive layer is provided with at least one inclined surface or curved surface at the second surface to form a micro-nano optical structure. The ratio of the sum of the components of the projection of the inclined surface or curved surface on the back of the transparent substrate 100 along the cross-sectional width direction of the textured adhesive layer to the cross-sectional width of the textured adhesive layer 200 is between 1:20-1:5, and the angle between the inclined surface and the back of the transparent substrate 100 is between 5 and 85°. In this embodiment, the angle between the inclined surface or curved surface and the back of the transparent substrate 100 needs to be controlled at 20±5° to ensure that the stereoscopic visual effect is clearest and without overlapping shadows. If the angle is 60±5°, the depth of the stereoscopic visual effect is the deepest. In addition, the surface roughness of the inclined surface or curved surface needs to be controlled to be ≤0.02um, so that the diffuse reflection of the reflected light can be eliminated as much as possible, and the function of reflecting light close to the perfect mirror surface can be achieved. Under the light source conditions of the same brightness, the smaller the roughness of the inclined surface or curved surface, the brighter and more transparent the stereoscopic visual effect. In this embodiment, the thickness of the textured adhesive layer 200 is 20-10000nm. Specifically, when the textured adhesive layer 200 of the inclined surface or curved surface is a micron-level optical structure, the thickness of the textured adhesive layer 200 is 3-10μm; when the textured adhesive layer 200 of the inclined surface or curved surface is a nanometer-level optical structure, the thickness of the textured adhesive layer 200 is 20~120nm. The transparency of the first ink layer 300 is less than 100%. The transparency of the first ink layer 300 is based on the fact that a reflective surface can be formed on the surface of the textured adhesive layer 200. The textured adhesive layer 200 reflects light and forms a three-dimensional pattern on the front of the transparent substrate 100. In this embodiment, the overall thickness of the optical structural member is at the micro-nano level. The setting of the optical structural member has little effect on the overall thickness of the transparent substrate 100, thereby avoiding the problem of interference with the internal accessories of the product.

[0031] See also Figure 3 When an optical structure composed of a textured adhesive layer 200 and a first ink layer 300 is arranged on a transparent substrate 100, when light is incident from the front side of the transparent substrate 100, the vertically incident light will be refracted above the textured adhesive layer 200 after contacting the inclined surface or curved surface on the textured adhesive layer 200 due to the existence of the first ink layer 300 as a reflective surface, and will be emitted in a deflected manner. In this way, after a number of light clusters are reflected by the textured adhesive layer 200 and the first ink layer 300, their optical paths are deflected, thereby forming a three-dimensional pattern on the front side of the transparent substrate 100, providing a three-dimensional appearance effect for the smart terminal cover.

[0032] Further, in this embodiment, in order to improve the adhesion strength of the texture adhesive layer on the transparent substrate, a tackifier layer is provided between the back surface of the transparent substrate and the texture adhesive layer. The tackifier layer bonds the back surface of the transparent substrate and the texture adhesive layer respectively to improve the adhesion stability of the texture adhesive layer on the transparent substrate. In one embodiment, the thickness of the tackifier layer is between 0.1 and 10 um, and the main components are high molecular organic substances such as acrylic or resin. It is processed by dispensing and inkjet printing, which helps the texture adhesive layer to adhere better to the transparent substrate, and its surface adhesion needs to reach 5B. In another embodiment, a layer of silicon Si or silicon oxide SiO can be electroplated on the back surface of the transparent substrate by PVD. The thickness is controlled between 5 and 200 nm, and there are no appearance defects such as pinholes in the coating. The adhesion to the system surface of the transparent substrate needs to reach 5B to obtain the tackifier layer.

[0033] In order to improve the reflection effect of light in front of the first ink layer 300 after passing through the transparent substrate 100, in one embodiment, a plating layer 600 is provided on the second surface of the texture adhesive layer 200, and the plating layer is located between the texture adhesive layer and the first ink layer. In this embodiment, the PVD sputtering method is used to form a film with alternately overlapping different refractive indexes on the target material of the texture adhesive layer 200 to obtain the plating layer 600. Each thin film layer is divided into a high refractive index thin film layer and a low refractive index thin film layer. The high refractive index thin film layer is mainly composed of one of silicon nitride, niobium oxide, titanium oxide, and zirconium oxide, and the low refractive index thin film layer is mainly composed of silicon oxide or magnesium fluoride. The total film thickness of the plating layer 600 needs to be controlled between 30 and 1000 nm to achieve the visual depth improvement of the texture adhesive layer 200, that is, the plating layer 600 is used to improve the reflection effect of the texture adhesive layer 200. In addition, a varnish layer is provided on the side of the plating layer 600 facing away from the transparent substrate 100, and the varnish layer is used to protect the plating layer 600.

[0034] Please refer to Figure 4, in one embodiment, a second ink layer 400 for reflecting light and forming a planar pattern on the front surface of the transparent substrate 100 is provided between the inner side of the texture glue layer 200 and the electroplating layer on the back surface of the transparent substrate 100, and the outer side surface of the texture glue layer 200 is flush with the outer side surface of the transparent substrate 100. In this embodiment, by providing the second ink layer 400 on the inner side of the texture glue layer 200, on the one hand, the texture glue layer 200 can be separated from the screen display area of the product, avoiding the influence of the bright light on the display of the three-dimensional pattern at the texture glue layer 200 when the screen is lit. On the other hand, since total internal reflection occurs at the second ink layer 400, no three-dimensional pattern will be generated on the front surface of the transparent substrate 100 corresponding to this position. When the first ink layer 300 and the second ink layer 400 both use inks of the same color, the color presented on the front surface of the transparent substrate 100 in the area corresponding to the texture glue layer 200 is different from the color presented on the front surface of the transparent substrate 100 in the area corresponding to the second ink layer 400, so that users can more clearly observe the three-dimensional appearance effect presented by the texture glue layer 200.

[0035] Please refer to Figure 5 , in another embodiment, a third ink layer 500 for reflecting light and forming a planar pattern on the front surface of the transparent substrate 100 is provided between the outer side of the texture glue layer 200 and the electroplating layer on the back surface of the transparent substrate 100, and the outer side surface of the third ink layer 500 is flush with the outer side surface of the transparent substrate 100. The setting mechanism of the third ink layer 500 is the same as that of the second ink layer 400, and the only difference is the setting position of the two.

[0036] It should be noted that in this embodiment, there can be only one inclined surface or arc surface on the texture glue layer 200 for providing a reflection surface after light enters the transparent substrate 100, and it is only necessary to ensure that the ratio of the projection width of the inclined surface and the arc surface on the front surface of the transparent substrate 100 to the width of the texture glue layer 200 is between 1:20 and 1:5 to ensure the three-dimensional appearance effect. Of course, a number of smaller inclined surfaces or arc surfaces can also be provided on the texture glue layer 200 to meet the user's requirements for the three-dimensional appearance effect of the smart terminal cover plate. In this embodiment, a sawtooth area is provided on the surface of the texture glue layer 200 facing away from the transparent substrate 100, and the sawtooth area includes a number of convex parts arranged continuously or at intervals, that is, the bottoms of the several convex parts can be directly connected, or can be connected through a section of plane on the back surface of the transparent substrate 100 or a section of plane on the texture glue layer 200. Further, the bottom of the convex part is spaced from the back surface of the transparent substrate 100 by a preset distance, and the preset distance is greater than or equal to 0. That is to say, the texture glue layer 200 can be composed of several convex parts directly fixed on the back surface of the transparent substrate 100, or several convex parts can be sequentially arranged on a sheet-like structure to obtain the texture glue layer 200.

[0037] In one embodiment, a plurality of convex portions include a plurality of identical first triangular structures, and the inner angle degree of the first triangular structure facing away from the transparent substrate 100 is greater than 90° (as Figure 14 shown). In another embodiment, a plurality of convex portions include a plurality of identical second triangular structures, and the inner angle degree of the second triangular structure facing away from the transparent substrate 100 is less than 90° (as Figures 6 - 7 shown). In yet another embodiment, a plurality of convex portions include a plurality of identical third triangular structures, and the inner angle degree of the third triangular structure facing away from the transparent substrate 100 is equal to 90° (as Figures 8 - 9 shown). In still another embodiment, a plurality of convex portions include a plurality of first triangular structures, a plurality of second triangular structures, and a plurality of third triangular structures arranged according to a preset rule or irregularly. In one embodiment, a plurality of convex portions include a plurality of fourth triangular structures, and the inner angles of each fourth triangular structure facing away from the transparent substrate 100 increase or decrease in sequence (as Figures 12 - 13 shown). In another embodiment, a plurality of convex portions include a plurality of fifth triangular structures with heights increasing or decreasing in sequence (as Figures 10 - 11 shown). In yet another embodiment, a plurality of convex portions include a plurality of sixth triangular structures, the inner angles of each sixth triangular structure facing away from the transparent substrate 100 increase or decrease in sequence, and the heights of each sixth triangular structure increase or decrease in sequence.

[0038] Please refer to Figure 15 and Figure 17 . In one embodiment, a plurality of convex portions include a plurality of trapezoidal structures with the same or different shapes. The trapezoidal structure can be an isosceles trapezoid, a right trapezoid, or other trapezoids. Please refer to Figure 18 . In another embodiment, a plurality of convex portions include a plurality of parallelogram structures with the same or different shapes. The parallelogram structure is a non-rectangular structure to ensure that there is an inclined surface on the convex portion to provide a reflecting surface. The sizes and angles of the convex portions of each parallelogram structure can be the same or different, specifically depending on the requirements of the target three-dimensional pattern. Please refer to Figure 16 and Figure 19 . In yet another embodiment, a plurality of convex portions include a plurality of frustum-shaped structures with the same or different shapes. The top of the frustum-shaped structure is an arc surface or a plane, and a plurality of inclined surfaces can be further provided on the circumferential side surface of the frustum-shaped structure. In still another embodiment, a plurality of convex portions include a plurality of arc-shaped structures or fan-shaped structures with the same or different shapes.

[0039] Furthermore, the first ink layer 300 of this embodiment is made by screen printing with a metal composite screen. It completely fills the gaps of the texture glue layer 200, making the entire optical structural member flat. The total thickness of the first ink layer 300 is greater than 10um. The adhesion between the first ink layer 300 and the electroplated layer 600 reaches 5B. The surface roughness of the first ink layer 300 is less than 0.5um, the dyne value is greater than 34, and the optical density OD value is greater than 4, and there should be no defects such as pinholes that cause poor light transmission. Only in this way can it be ensured that more than 95% of the light incident from the main surface of the transparent substrate 100 into the texture glue layer 200 is reflected out, forming the final three-dimensional visual effect.

[0040] In this embodiment, the texture glue layer 200 is made of UV glue. Specifically, the texture glue layer 200 is obtained by transferring UV glue through a mold. The following combines specific examples to illustrate the processing process of the intelligent terminal cover plate of the present invention.

[0041] The processing process of the intelligent terminal cover plate includes the following steps:

[0042] S1. Design of the texture glue layer structure:

[0043] Design the micro-nano optical structure of the texture glue layer according to the required appearance effect, select different mold processing machines according to different structures, and draw the corresponding mold drawings.

[0044] S2. Mold making: In this embodiment, mold making includes two methods: photolithography process and mechanical processing process. Among them, the photolithography process includes parallel light exposure, or laser exposure, or grayscale exposure; mechanical processing includes lathe milling, or grinder fine polishing, or CNC engraving.

[0045] Specifically, when using a laser direct writing lithography machine to process the mold, after cleaning the glass substrate, spin-coat positive photoresist on the substrate and perform solid baking. Use the laser direct writing lithography machine to expose the photoresist, so that the photoresist is photosensitized and undergoes chemical property changes, and then use a developer to remove the exposed part of the photoresist, leaving the unexposed micro-nano optical structure (as Figure 20 shown).

[0046] When using an ultra-precision CNC machine tool to process the mold, after cleaning the aluminum alloy substrate, electroplate a nickel layer on the aluminum alloy substrate, use the ultra-precision CNC machine tool to polish the surface of the nickel layer to make the nickel layer flat. Use the ultra-precision CNC machine tool to turn the flattened nickel layer to process the required micro-nano optical structure (as Figure 21 shown).

[0047] After the transfer mold processing is completed, before mold transfer, a tackifier layer with a thickness between 0.1 and 10um needs to be made on the system surface of the transparent substrate to improve the adhesion stability of the texture glue layer on the transparent substrate.

[0048] S3. GDM (Glass Direct Mold) transfer printing can be achieved by UV transfer printing, thermal transfer printing, intaglio / relief printing, screen printing / decal printing, laser engraving, etc. to attach the micro-nano optical structure to the back of the transparent substrate. Preferably, in this embodiment, UV transfer printing is used for the transfer printing of the micro-nano optical structure. When using UV transfer printing, a glass mold / metal mold is used for master mold transfer printing to transfer the structure to PET to obtain a PET master mold; then, the soft PET mold is transferred to a hard PC board by soft-to-hard transfer printing to obtain a PC mold; the hard PC mold is transferred to soft PET by hard-to-soft transfer printing. Subsequently, a GDM transfer screen is made according to the mold size drawing, and the PET mold is masked and transferred using the screen to obtain a GDM film mold; finally, the micro-nano optical structure is transferred to the final product using the GDM film mold. As Figure 22 shown, specifically:

[0049] S31. Fix the transfer mold on the transfer table, drop UV glue on the mold, apply a PET film to the mold, use a roller to press the mold, UV glue, and film tightly together, remove the excess glue, and then cure the UV glue using a UV lamp to cure the glue on the PET film. Finally, separate the film to obtain a PET film with a micro-nano optical structure.

[0050] S32. Use a glass mold or metal mold for master mold transfer printing to transfer the micro-nano optical structure to soft PET. Before transfer printing, the master mold needs to be cleaned and inspected for quality before and after cleaning to ensure that the cleaning does not damage the mold structure and avoid poor appearance of the mold.

[0051] S33. Transfer the soft PET master mold to a hard PC board to form a hard PC mold, and then transfer the hard PC mold to soft PET. This step is to increase the iteration of the mold. Since the mold has a service life and the original mold and the first-generation master mold cannot be used for product transfer printing, multiple transfer printings are required to enable batch replication of the mold. This process can also adjust the front and back of the structure by increasing the number of transfer printings to ensure the correct structure orientation on the final product.

[0052] S34. Make a screen according to the outline drawing of the product, transfer the PET mold to a thin PC board, and use the screen to print opaque ink onto the non-structured area of the PC board to obtain a film mold.

[0053] S35. Use a film mold for product transfer printing. Fix the product on the transfer printing table, drop UV glue, and cover the film mold on the product. Use a UV lamp to cure the glue. The opaque ink on the film mold will block the UV lamp, and the glue in the blocked part will not be photosensitized and cured. Therefore, the effective area required for the product is retained. After film separation, clean the product to obtain a product with a micro-nano optical structure, that is, a transparent substrate provided with a texture glue layer.

[0054] S4. Electroplating layer processing (i.e., micro-nano thin film processing). In this embodiment, physical vapor deposition PVD or chemical vapor deposition CVD can be used to process the electroplating layer. Among them, PVD mainly includes evaporation, sputtering, ion plating, arc plating, plasma plating, etc. Preferably, in this embodiment, physical vapor deposition PVD is used to perform electroplating operations on the surface of the texture glue layer. Specifically:

[0055] S41. First, conduct a visual appearance inspection on the incoming product (transparent substrate provided with a texture glue layer).

[0056] S42. Gently place the products after visual inspection one by one into a cleaning basket such as a cleaning rack.

[0057] S43. Place the entire cleaning rack and other baskets into an ultrasonic cleaning machine for cleaning.

[0058] S44. Take out the products after cleaning from the cleaning basket and place them one by one on the wafer carrier umbrella or drum of the coating machine.

[0059] S45. Perform electroplating operations on the coating machine so that a uniformly thick electroplating layer adheres to the surface of the texture glue layer.

[0060] S46. Remove the products from the umbrella or drum. The product structure is as Figure 23 shown.

[0061] S47. Conduct appearance and performance inspections on the products.

[0062] S5. Ink processing. The first ink layer can be attached to the surface of the electroplating layer by means of screen printing, pad printing, spraying, inkjet printing, intaglio / relief printing, etc. Preferably, in this embodiment, screen printing is used to attach the ink to the electroplating layer to form the first ink layer. Specifically:

[0063] S51. Conduct ink formulation. Take materials and add them in the ratio of ink base: thinner: curing agent = 1: 0.2% - 5%: 2% - 50%.

[0064] S52. Mix and use a stirrer to stir to make it fully and evenly mixed.

[0065] S53. Turn on the screen printer, install the screen plate, pour in the ink, and screen-print the electroplated products.

[0066] S54. Place the electroplated products in a tunnel furnace and pre-bake them at a temperature of 80 - 120 °C for 3 - 15 minutes.

[0067] S55. Repeat steps S53 - S54 for 2 - 5 times.

[0068] S56. Bake the products in a high-temperature oven at a temperature of 130 - 200 °C for 15 - 60 minutes.

[0069] S57. Inspect the appearance and performance of the products. The product structure is as Figure 24 shown.

[0070] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0071] The above-described embodiments only represent several implementation manners of the present utility model. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several modifications and improvements can still be made, and these all belong to the protection scope of the present utility model. Therefore, the protection scope of the utility model patent shall be subject to the appended claims.

Claims

1. A smart terminal cover with a micro-nano optical structure, characterized in that: The invention comprises a transparent substrate (100) for forming a screen cover or back cover of an intelligent terminal, and an annular optical structure (101) extending along the edge of the transparent substrate (100) on the back side of the transparent substrate (100); the outer contour of the optical structure (101) is flush with the outer contour of the transparent substrate (100); the optical structure (101) comprises an annular textured adhesive layer (200) at least attached to the back side of the transparent substrate (100) and having a micro-nano optical structure; the textured adhesive layer (200) comprises a first surface attached to the transparent substrate (100) and a second surface facing away from the transparent substrate (100); the textured adhesive layer (200) has a first surface attached to the transparent substrate (100) and a second surface facing away from the transparent substrate (100); The second surface is filled with a first ink layer (300) for forming a reflective surface; the cross section of the textured adhesive layer (200) is provided with at least one inclined surface or curved surface at the second surface to form the micro-nano optical structure; the ratio of the sum of the components of the projection of the inclined surface or curved surface on the back side of the transparent substrate (100) along the cross-sectional width direction of the textured adhesive layer (200) to the cross-sectional width of the textured adhesive layer (200) is between 1:20 and 1:5; the angle between the inclined surface and the back side of the transparent substrate (100) is between 5 and 85 degrees; the textured adhesive layer (200) reflects light and forms a visual effect of a three-dimensional pattern on the front side of the transparent substrate (100).

2. The intelligent terminal cover plate according to claim 1, characterized in that: The second surface of the textured adhesive layer (200) is provided with an electroplating layer (600), and the electroplating layer (600) is located between the textured adhesive layer (200) and the first ink layer (300).

3. The intelligent terminal cover plate according to claim 2, characterized in that: A second ink layer (400) for reflecting light and forming a planar pattern on the front side of the transparent substrate (100) is provided on the inner side of the textured adhesive layer (200) between the back side of the transparent substrate (100) and the electroplating layer (600), and the outer side surface of the textured adhesive layer (200) is flush with the outer side surface of the transparent substrate (100).

4. The intelligent terminal cover plate according to claim 2, characterized in that: A third ink layer (500) is provided on the outer side of the textured adhesive layer (200) between the back side of the transparent substrate (100) and the electroplating layer (600) for reflecting light and forming a planar pattern on the front side of the transparent substrate (100); the outer side surface of the third ink layer (500) is flush with the outer side surface of the transparent substrate (100).

5. The intelligent terminal cover plate according to claim 1, characterized in that: A sawtooth region is provided on a surface of the textured adhesive layer (200) facing away from the transparent substrate (100), and the sawtooth region includes a plurality of convex portions that are continuously distributed or spaced apart.

6. The intelligent terminal cover plate according to claim 5, characterized in that: The bottom of the convex portion is spaced from the back surface of the transparent substrate (100) by a preset distance, and the preset distance is greater than or equal to 0.

7. The intelligent terminal cover plate according to claim 5, characterized in that: The plurality of convex portions include a plurality of identical first triangular structures, and the internal angle degree of the first triangular structure facing away from the transparent substrate is greater than 90°; or the plurality of convex portions include a plurality of identical second triangular structures, and the internal angle degree of the second triangular structure facing away from the transparent substrate is less than 90°; or the plurality of convex portions include a plurality of identical third triangular structures, and the internal angle degree of the third triangular structure facing away from the transparent substrate is equal to 90°; or the plurality of convex portions include a plurality of first triangular structures, a plurality of second triangular structures, and a plurality of third triangular structures arranged according to a preset rule or arranged irregularly; or the plurality of convex portions include a plurality of fourth triangular structures, and the internal angle of each fourth triangular structure facing away from the transparent substrate increases or decreases in sequence; or the plurality of convex portions include a plurality of fifth triangular structures whose height increases or decreases in sequence; or the plurality of convex portions include a plurality of sixth triangular structures, and the internal angle of each sixth triangular structure facing away from the transparent substrate increases or decreases in sequence, and the height of each sixth triangular structure increases or decreases in sequence.

8. The intelligent terminal cover plate according to claim 5, characterized in that: The plurality of protrusions include a plurality of trapezoidal structures of the same or different shapes; or the plurality of protrusions include a plurality of parallelogram structures of the same or different shapes, wherein the parallelogram structure is a non-rectangular structure; or the plurality of protrusions include a plurality of frustum-shaped structures of the same or different shapes.

9. The intelligent terminal cover plate according to claim 5, characterized in that: The plurality of protrusions include a plurality of arc-shaped structures or fan-shaped structures having the same or different shapes.

10. The intelligent terminal cover plate according to claim 1, characterized in that: An adhesion-promoting layer is provided between the back surface of the transparent substrate (100) and the textured adhesive layer (200).

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