Glass and manufacturing method therefor, cover plate and manufacturing method therefor, and electronic device

Abstract

The present application relates to the technical field of electronic products, and provides glass and a manufacturing method therefor, a cover plate and a manufacturing method therefor, and an electronic device, used for solving the problem of how to improve the light-shielding performance of non-light-transmitting portions of cover plates. The components of the glass include SiO2, Al2O3, Ce2O3, an alkali metal oxide, and a colorant. The colorant comprises at least one of Ag2O and Au2O. The Ce2O3 is used for reducing metal cations in the colorant into metal atoms under ultraviolet or infrared light irradiation, and the metal atoms are used for making the light transmittance of the glass less than that before the light irradiation. The cover plate is made of the glass. A light-shielding portion has relatively high light-shielding performance, thereby achieving relatively high reliability.

Description

Glass and method for manufacturing the same, cover plate and method for manufacturing the same, and electronic device

[0001] The present application claims priority to the Chinese patent application No. 202410904488.4, filed on July 5, 2024, and entitled "Glass and method for manufacturing the same, cover plate and method for manufacturing the same, and electronic device", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of electronic products, in particular to a glass and a method for manufacturing the same, a cover plate and a method for manufacturing the same, and an electronic device. BACKGROUND

[0003] There are usually partially light-transmitting cover plates in electronic devices, such as light-transmitting cover plates in screens, back cover plates of smart watches and smart bands, camera lenses, etc. The cover plate usually has a light-transmitting part and a non-light-transmitting part. The light-transmitting part is used for transmitting light emitted by light-emitting components (such as a display screen, an LED, etc.) of the electronic device to the outside of the electronic device, or for transmitting light (such as ambient light, light emitted by an LED and reflected by a user) from the outside of the electronic device to light-receiving components (such as a camera module, a light detector, etc.) inside the electronic device. The non-light-transmitting part can be used to shield components inside the electronic device, or to separate multiple light-transmitting parts to prevent light from interfering between light-emitting components and light-receiving components, etc.

[0004] In related technologies, an ink layer is usually arranged on part of the inner surface of a light-transmitting structural member such as glass or sapphire to form a non-light-transmitting part of the cover plate, so as to meet the requirement of dividing the cover plate into a light-transmitting part and a non-light-transmitting part. However, the ink can only be arranged on the surface of the light-transmitting structural member, and is prone to aging and falling off, etc., resulting in poor light-shielding performance of the non-light-transmitting part, and further resulting in poor reliability of the cover plate as a whole. SUMMARY

[0005] Embodiments of the present application provide a glass and a method for manufacturing the same, a cover plate and a method for manufacturing the same, and an electronic device, to solve the problem of how to improve the light-shielding performance of the non-light-transmitting part of the cover plate.

[0006] To achieve the above-mentioned purpose, embodiments of the present application adopt the following technical solutions:

[0007] In a first aspect, the embodiments of the present application provide a glass, the composition of the glass comprising SiO2, Al2O3, Ce2O3, alkali metal oxide and colorant, the colorant comprising at least one of Ag2O and Au2O, the Ce2O3 being used to reduce metal cations in the colorant into metal atoms under light irradiation treatment of ultraviolet light or infrared light, the metal atoms being used to make the light transmittance of the glass less than the light transmittance before the light irradiation treatment.

[0008] The glass provided in the present application can form a continuous network structure with silicon-oxygen tetrahedron as a structural unit by including SiO2 in the components of the glass, so that the glass has good structural stability, chemical stability and mechanical properties; by including Al2O3 in the components of the glass, the mechanical properties and chemical durability of the glass can be further improved, and at the same time, larger gaps can be generated in the glass, which is conducive to improving the ion exchange performance of the glass, so as to improve the effect of ion exchange strengthening of the glass; by including alkali metal oxides in the components of the glass, the viscosity of the glass can be reduced, the glass can be quickly melted and clarified, and the glass forming performance can be improved; by including Ce2O3 and a colorant in the components of the glass, and the colorant including at least one of Ag2O and Au2O, the metal cations in the colorant are colorless ions before the glass is subjected to light treatment, which does not affect the light transmittance of the glass, and when the glass is subjected to light treatment, the Ce2O3 can absorb the energy of ultraviolet light or infrared light to reduce the metal cations in the colorant to metal atoms, and the metal atoms have a strong absorption effect on light, so that the glass after light treatment has a strong absorption effect on light, thereby reducing the light transmittance of the glass.

[0009] Based on this, the glass provided in the present application is conducive to forming a light shielding part with low and uniform light transmittance everywhere after light treatment, and the light shielding reliability of the glass structure part with the light shielding part is good. In addition, when the colorant is Ag2O, the silver ions in the glass can also have a certain inhibitory and killing effect on a variety of bacteria (such as Staphylococcus aureus and Escherichia coli), which is conducive to maintaining the health of users.

[0010] In some possible implementation manners of the first aspect, the mass fraction of the colorant is greater than or equal to 0.0001% and less than or equal to 0.5%, and the mass fraction of Ce2O3 is greater than or equal to 0.0001% and less than or equal to 0.3%.

[0011] In this way, the light transmittance of the glass can be reduced to the required light transmittance after light treatment, and the addition amount of Ce2O3 can be prevented from being too large, in which the cerium ions with color reduce the light transmittance of the glass.

[0012] In some possible implementation manners of the first aspect, the components of the glass further include at least one of Sb2O3, SnO and Bi2O3.

[0013] In this way, the cerium ions can be introduced in the form of CeO2 in the raw materials for preparing the glass, and at least one of Sb2O3, SnO and Bi2O3 can reduce Ce4+ to Ce3+ during the preparation of the glass, so as to reduce the light transmittance of the glass after the light treatment, and prevent the more active Ce3+ from being oxidized to Ce4+ during the preparation of the glass when Ce2O3 is directly introduced in the raw materials for preparing the glass, and the change of the light transmittance of the formed glass after the light treatment cannot be achieved. In addition, at least one of Sb2O3, SnO and Bi2O3 can also reduce Ce4+ converted from Ce3+ after absorbing the light energy to Ce3+ during the light treatment of the glass, so as to ensure the continuous photochemical reaction to obtain the glass structure meeting the requirements of the light transmittance. Finally, when the glass component includes Sb2O3, Sb2O3 can also act as a clarifying agent during the preparation of the glass, and the bubbles are discharged out of the glass body through chemical reactions at different temperatures.

[0014] In some possible implementation manners of the first aspect, the sum of the mass fraction of Sb2O3, the mass fraction of SnO and the mass fraction of Bi2O3 is greater than or equal to 0.0001% and less than or equal to 1%.

[0015] In this way, the content of Ce3+ in the glass can be ensured to reach the required content of the light transmittance of the glass without affecting the performance of the glass.

[0016] In some possible implementation manners of the first aspect, the components of the glass are uniformly distributed in the glass.

[0017] In this way, the performance of each part of the glass is uniform, and thus the performance parameters of each part of the structure formed by the glass are uniform.

[0018] In some possible implementation manners of the first aspect, the light transmittance of the glass is greater than or equal to 80% for light with a wavelength of 400 nm-1000 nm.

[0019] In this way, the energy loss of the light is small when the light passes through the glass structure formed by the glass, the light emitted by the light emitting device can be transmitted to the skin of the user as much as possible in the electronic device with the back cover formed by the glass, and the light reflected by the user's body can be transmitted to the light detector as much as possible, which is beneficial to improve the detection accuracy of the physiological information of the user by the electronic device.

[0020] In a second aspect, the embodiments of the present application provide a cover plate, which comprises a cover plate body formed by the glass manufacturing method described in any of the above implementation manners. The cover plate body comprises a light-transmitting part and a light-blocking part. The light-transmitting part has the same composition as the glass. The light-blocking part is connected to the light-transmitting part, and the light-blocking part comprises the metal atoms and has a light transmittance lower than that of the light-transmitting part.

[0021] Since the cover plate provided by the embodiments of the present application is formed by the glass manufacturing method described in any of the above implementation manners, the same problems can be solved and the same effects can be achieved, which will not be described here.

[0022] In some possible implementation manners of the second aspect, the ratio of the number of the metal atoms in the light-blocking part to the sum of the number of the metal atoms and the number of the metal cations in the light-blocking part is greater than or equal to 50%.

[0023] In this way, when the mass fractions of the colorant and Ce2O3 in the glass are within the preset range to ensure the light transmittance of the formed light-transmitting part, the higher the concentration of the metal atoms in the light-blocking part, the lower the light transmittance of the light-blocking part, and the better the light-blocking performance of the light-blocking part.

[0024] In some possible implementation manners of the second aspect, the light transmittance of the light-blocking part is less than or equal to 10% for light with a wavelength of 400 nm-1000 nm.

[0025] In this way, the light-blocking part has strong absorption to light, and the light-blocking performance of the light-blocking part is better.

[0026] In some possible implementation manners of the second aspect, the light-transmitting part comprises a first light-transmitting part and a second light-transmitting part, and the second light-transmitting part is arranged at intervals from the first light-transmitting part. At least a part of the light-blocking part is connected between the first light-transmitting part and the second light-transmitting part, and the light-blocking part is integrally formed with the first light-transmitting part and the second light-transmitting part.

[0027] In this way, when the cover plate is applied to an electronic device, the first light-transmitting part can be arranged opposite to a light-emitting device of the electronic device, the second light-transmitting part can be arranged opposite to a light receiver of the electronic device, and the light-blocking part can effectively reduce the amount of light emitted by the light-emitting device of the electronic device that is reflected inside the light-blocking part and enters the light receiver, thereby improving the signal-to-noise ratio of the electronic device and further improving the accuracy of detection of physiological information of a user by the electronic device. In addition, the light-blocking part is combined with the first light-transmitting part and the second light-transmitting part through chemical bonds, has a continuous and uniformly distributed internal structure, and has no splicing interface, so that the integration of the cover plate body is exquisite, and the mechanical properties and chemical properties of the light-blocking part and the light-transmitting part are uniform, and the reliability is good.

[0028] In some possible implementation manners of the second aspect, the cover plate body includes a first body part and an ion exchange layer. A part of the first body part forms a part of the light-shielding part, and another part of the first body part forms a part of the light-transmitting part. The ion exchange layer is formed on a surface of the first body part, a part of the ion exchange layer forms another part of the light-shielding part, and another part of the ion exchange layer forms another part of the light-transmitting part.

[0029] In this way, the surface of the cover plate body can obtain a certain compressive stress. When the cover plate is subjected to an external force, the compressive stress of the surface of the cover plate body needs to be offset first, and then the cover plate body is in a tensile state. In addition, the surface layer of the cover plate body is the ion exchange layer, which can effectively eliminate or inhibit the expansion of cracks, thereby improving the ability of the cover plate body to resist external force and significantly enhancing the strength of the cover plate body.

[0030] In some possible implementation manners of the second aspect, the thickness of the ion exchange layer is greater than or equal to 0.08t and less than or equal to 0.22t, where t is the thickness of the cover plate body.

[0031] In some possible implementation manners of the second aspect, the cover plate has a first surface and a second surface arranged along a thickness direction. The cover plate further includes an ink layer, at least a part of the ink layer is arranged at an edge region of one surface of the cover plate body and surrounds the light-transmitting part, and the ink layer forms a part of the first surface.

[0032] In this way, when the cover plate is applied to an electronic device and bonded to a shell of the electronic device, the ink layer can increase the bonding strength between the cover plate and the shell. In addition, the ink layer can further shield the components inside the electronic device, thereby improving the visual effect of the appearance of the electronic device.

[0033] In some possible implementation manners of the second aspect, the cover plate has a first surface and a second surface arranged along a thickness direction. The cover plate further includes a first electrode and a second electrode. The first electrode is arranged on the cover plate body, and a part of a surface of the first electrode forms a part of the second surface. The second electrode is arranged on the cover plate body and is spaced apart from the first electrode, and a part of a surface of the second electrode forms a part of the second surface.

[0034] In this way, when the cover plate is applied to an electronic device, the first electrode and the second electrode can be used to detect the electrical signals of the skin of a user, and the electrocardiogram of the user can be formed after analysis by a processor of the electronic device.

[0035] In some possible implementation manners of the second aspect, the cover plate has a first surface and a second surface arranged along a thickness direction. The first surface and the second surface are both planar.

[0036] In this way, the cover plate is a 2D cover plate, and the cover plate is simple in design and manufacturing process, and high in manufacturing efficiency.

[0037] In some possible implementation manners of the second aspect, the second surface gradually protrudes in a direction away from the first surface along the outer edge to the center region.

[0038] In some possible implementation manners of the second aspect, the second surface gradually protrudes in a direction away from the first surface along the outer edge to the center region.

[0039] In this way, the cover plate can be a 3D cover plate. When the cover plate is applied to an electronic device, the cover plate is in contact with the skin of a user, so as to improve the detection accuracy of the electronic device on physiological information of the user.

[0040] In a third aspect, an electronic device is provided, which includes a cover plate, a shell, and a light-emitting device. The cover plate is the cover plate in any of the implementation manners described above, and the cover plate has a first surface and a second surface arranged along a thickness direction. The shell is arranged around the cover plate and connected to the cover plate, and the shell and the cover plate enclose a containing space, and the first surface forms part of an inner wall of the containing space. The light-emitting device is arranged in the containing space, and a light-emitting surface of the light-emitting component faces the light-transmitting portion, and the light-blocking portion is located on a side of the light-transmitting portion.

[0041] Since the electronic device provided in the embodiments of the present application includes the cover plate in any of the implementation manners described above, the same problems can be solved and the same effects can be achieved, and thus details are not repeated here.

[0042] In some possible implementation manners of the third aspect, the electronic device further includes a light-receiving component. The light-transmitting portion includes a first light-transmitting portion and a second light-transmitting portion arranged at intervals, and at least part of the light-blocking portion is connected between the first light-transmitting portion and the second light-transmitting portion and is integrally formed with the first light-transmitting portion and the second light-transmitting portion; the light-emitting surface of the light-emitting device faces the first light-transmitting portion; and a light-receiving surface of the light-receiving component faces the second light-transmitting portion.

[0043] In this way, the light-blocking portion can effectively reduce the amount of light emitted by the light-emitting device that is reflected inside the light-blocking portion and enters the light-receiving component (the amount of light leakage), which is conducive to improving the signal-to-noise ratio of the electronic device, and thus improving the accuracy of the electronic device in detecting physiological information of a user.

[0044] In a fourth aspect, an electronic device is provided. The electronic device includes a cover plate, a housing, and a light receiving component. The cover plate is as described in any of the above implementations. The cover plate has a first surface and a second surface arranged along a thickness direction. The housing is arranged around the cover plate and connected to the cover plate. The housing and the cover plate enclose a receiving space, and the first surface forms part of an inner wall of the receiving space. The light receiving component is arranged in the receiving space. An incident light surface of the light receiving component faces the light transmission portion, and the light shielding portion is located on a side of the light transmission portion.

[0045] The electronic device provided by the embodiments of the present application includes the cover plate as described in any of the above implementations, and thus the same problems can be solved and the same effects can be achieved. Details are not described herein.

[0046] In a fifth aspect, a manufacturing method of a cover plate is provided. The method includes providing a glass, which is as described in any of the above implementations. The first part of the glass is treated by ultraviolet light or infrared light to form a light shielding portion, and the part of the glass other than the first part forms a light transmission portion. The light transmittance of the light shielding portion is less than the light transmittance of the light transmission portion.

[0047] In this way, the light transmittance of the light shielding portion of the cover plate is low and uniform, and the light shielding reliability of the light shielding portion is good. In addition, when the colorant in the glass is Ag2O, the silver ions in the cover plate can also have a certain inhibitory and killing effect on a variety of bacteria (such as Staphylococcus aureus and Escherichia coli), which is conducive to maintaining the health of users. In addition, the manufacturing method is simple, the light shielding portion and the light transmission portion of the cover plate are combined by chemical bonds, have a continuous and uniform internal structure, and do not have a splicing interface. The integration of the cover plate is exquisite, and thus the mechanical properties and chemical properties of the light shielding portion and the light transmission portion are uniform, and the reliability is good.

[0048] In some possible implementation ways of the fifth aspect, the light transmission portion includes a first light transmission portion and a second light transmission portion, and at least part of the light shielding portion is connected between the first light transmission portion and the second light transmission portion.

[0049] In some possible implementation ways of the fifth aspect, the treatment of the first part of the glass by ultraviolet light or infrared light to form the light shielding portion and the part of the glass other than the first part to form the light transmission portion includes: arranging a light shielding structure on the surface of the part of the glass other than the first part; treating the first part by ultraviolet light or infrared light to reduce metal cations in the colorant in the first part into metal atoms; and removing the light shielding structure.

[0050] In this way, the light shielding part is formed by irradiating the unshielded part of the glass with ultraviolet light or infrared light, the manufacturing process is simple, easy to implement, and has good manufacturing efficiency.

[0051] In some possible implementation manners of the fifth aspect, the wavelength of the ultraviolet light is greater than or equal to 300 nm and less than or equal to 350 nm.

[0052] In this way, the wavelength of the ultraviolet light is near the absorption peak of Ce3+, and the energy of the ultraviolet light is more easily absorbed by Ce3+ in the glass to release free electrons, so that the metal cations in the colorant are reduced to metal atoms, and the light transmittance is reduced.

[0053] In some possible implementation manners of the fifth aspect, after the first part of the glass is irradiated to form the light shielding part and the part of the glass other than the first part forms the light transmitting part, the method further includes: heating the light shielding part at a first temperature to make the metal atoms gather in a cluster state.

[0054] In this way, the metal atoms gather in the cluster state to further enhance the light absorption capacity of the metal atoms, and at the same time, in the process of heating, lithium metasilicate nanocrystalline particles are formed in the glass with the metal atoms in the dispersed state and the metal atoms in the cluster state as crystal nuclei when the components of the glass include Li2O, which further enhances the light absorption capacity of the light shielding part and reduces the light transmittance of the light shielding part.

[0055] In some possible implementation manners of the fifth aspect, the first temperature is greater than or equal to 400 DEG C and less than or equal to 650 DEG C.

[0056] In this way, the metal atoms can be gathered as soon as possible to improve the manufacturing efficiency of the cover plate, and the glass will not soften and deform.

[0057] In some possible implementation manners of the fifth aspect, after the first part of the glass is irradiated to form the light shielding part and the part of the glass other than the first part forms the light transmitting part, the method further includes: chemically strengthening the light shielding part and the light transmitting part to obtain a cover plate body with an ion exchange layer on the surface.

[0058] In this way, the surface of the formed cover plate body can obtain a certain compressive stress, and when the cover plate body is subjected to an external force, the compressive stress on the surface of the cover plate body needs to be offset first, and then the cover plate body is in a tension state. In addition, the surface layer of the cover plate body is an ion exchange layer, which can effectively eliminate or inhibit the expansion of cracks, and therefore, the cover plate body has strong resistance to external forces.

[0059] In some possible implementation manners of the fifth aspect, the alkali metal compound in the glass includes Li2O, Na2O, and K2O. The chemical strengthening treatment on the light-shielding part and the light-transmitting part to obtain the cover plate body with the ion exchange layer on the surface includes: placing the light-shielding part and the light-transmitting part in a first molten salt at a second temperature for a first duration to perform a first ion exchange, and the first molten salt includes at least one of sodium nitrate and potassium nitrate.

[0060] In this way, the alkali metal compound can reduce the difficulty of manufacturing the glass in the process of preparing the glass, and the metal cations in the alkali metal compound can be exchanged with metal cations with a larger radius in the molten salt to form the ion exchange layer in the process of chemical strengthening treatment, so that the cover plate formed has better performance.

[0061] In some possible implementation manners of the fifth aspect, the chemical strengthening treatment on the light-shielding part and the light-transmitting part to obtain the cover plate body with the ion exchange layer on the surface further includes: placing the light-shielding part and the light-transmitting part in a second molten salt at a third temperature for a second duration to perform a second ion exchange, the second molten salt includes at least one of sodium nitrate and potassium nitrate, and the second duration is less than the first duration.

[0062] In this way, by twice ion exchange, the thickness of the ion exchange layer and the surface compressive stress value can be effectively increased, and the performance of the cover plate formed is further improved.

[0063] In some possible implementation manners of the fifth aspect, after the light irradiation treatment is performed on the first part of the glass to form the light-shielding part and the part other than the first part of the glass forms the light-transmitting part, the method further includes: forming a first electrode and a second electrode on the surface of the light-shielding part to obtain the cover plate; and the first electrode and the second electrode are arranged at intervals, and part of the surface of the first electrode and part of the surface of the second electrode form part of a region of one surface of the cover plate.

[0064] In this way, when the cover plate formed is used in an electronic device, the first electrode and the second electrode can be in contact with the skin of a user to collect an electrical signal and generate an electrocardiogram of the user.

[0065] In some possible implementation manners of the fifth aspect, after the light irradiation treatment is performed on the first part of the glass to form the light-shielding part and the part other than the first part of the glass forms the light-transmitting part, the method further includes: forming an ink layer on the surface of the light-shielding part to obtain the cover plate, and at least part of the ink layer forms an edge region of one surface of the cover plate and is arranged around the light-transmitting part.

[0066] In this way, the ink layer of the cover plate can improve the bonding strength between the cover plate and other structures of the electronic device, further shield the components inside the electronic device, and in the case where the cover plate further includes a first electrode and a second electrode, the ink layer can also protect the first electrode and the second electrode, thereby improving the safety and reliability of the entire electronic device.

[0067] In a sixth aspect, an embodiment of the present application provides a glass manufacturing method, comprising: mixing raw materials for preparing glass and melting to obtain a glass liquid; cooling and shaping the glass liquid to obtain a glass base; and annealing the glass base to obtain the glass; wherein the composition of the glass comprises SiO2, Al2O3, Ce2O3, alkali metal oxide and colorant, and the colorant comprises at least one of Ag2O and Au2O.

[0068] Due to the glass manufacturing method provided by the embodiment of the present application, the obtained glass has the same composition as the aforementioned glass, and thus can solve the same problem and achieve the same effect, which will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0069] FIG. 1 is a structural schematic diagram of an electronic device provided by some embodiments of the present application;

[0070] FIG. 2 is a perspective structural diagram of a watch body of the electronic device shown in FIG. 1;

[0071] FIG. 3 is an exploded view of the watch body shown in FIG. 2;

[0072] FIG. 4 is another perspective structural diagram of the watch body of the electronic device shown in FIG. 1;

[0073] FIG. 5 is a schematic diagram of the principle of detecting the heart rate of a user by the electronic device shown in FIG. 1;

[0074] FIG. 6 is a sectional structural diagram of the watch body shown in FIG. 2 at E-E line;

[0075] FIG. 7 is another sectional structural diagram of the watch body shown in FIG. 2 at E-E line;

[0076] FIG. 8 is a structural diagram of a back cover of the watch body shown in FIG. 2;

[0077] FIG. 9 is another structural diagram of the back cover of the watch body shown in FIG. 2;

[0078] FIG. 10 is a curve diagram of the relationship between the light transmittance of the light shielding part and the light transmittance of the light transmitting part of the cover plate body and the wavelength of light;

[0079] FIG. 11 is a sectional structural diagram of the back cover shown in FIG. 8 at F-F line;

[0080] Fig. 12 is another structural view of the back cover of the watch body shown in Fig. 2;

[0081] Fig. 13 is a structural view of the back cover shown in Fig. 12 from another perspective;

[0082] Fig. 14 is a sectional view of the back cover shown in Fig. 12 at line G-G;

[0083] Fig. 15 is another sectional view of the back cover shown in Fig. 12 at line G-G;

[0084] Fig. 16 is a structural view of the light-transmitting cover plate of the watch body shown in Fig. 3;

[0085] Fig. 17 is another structural view of the light-transmitting cover plate of the watch body shown in Fig. 3;

[0086] Fig. 18 is a flow chart of a method for manufacturing the cover plate provided in the present application;

[0087] Fig. 19 is a structural schematic diagram of the method for manufacturing the cover plate provided in the present application.

[0088] Reference signs: 100-electronic device; 10-watchband; 11-first watchband part; 111-first locking part; 12-second watchband part; 121-second locking part; 20-watch body; 20a-accommodation space; 21-screen; 211-light-transmitting cover plate; 212-display screen; 22-casing assembly; 221-casing; 2211-second main body part; 2212-first protruding part; 222-back cover; 222a-first surface; 222b-second surface; 2221-body part; 2221a-third through hole; 2221b-fourth through hole; 2222-inlaid part; 2223-cover plate body; 22231-light-transmitting part; 22231a-first light-transmitting part; 22231b-second light-transmitting part; 22232-light-blocking part; 22233-ion exchange layer; 22234-first main body part; 2224-first electrode; 2225-second electrode; 2226-ink layer; 223-light-blocking member; 223a-first through hole; 223b-second through hole; 23-detection assembly; 231-light-emitting device; 232-light detector; 24-circuit board; 241-central processing unit; 200-skin; 210-muscle tissue; 220-artery; 300-glass substrate; 400-glass; 410-first part; 500-light-blocking structure. DETAILED DESCRIPTION

[0089] In the embodiments of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms “mounting” and “connecting” should be understood in a broad sense, for example, “connecting” can be detachably connecting or non-detachably connecting; can be directly connecting or indirectly connecting through an intermediate medium.

[0090] In the embodiments of the present application, it should be understood that the positional terms mentioned, such as "upper", "lower", "left", "right", "inner", "outer" and the like, are merely directional terms with reference to the drawings, and therefore, the positional terms used are for better and clearer illustration and understanding of the embodiments of the present application, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application. In addition, the shapes of various components described below are "rectangular" and "square", which all represent approximate shapes, and adjacent two sides can be provided with or without rounded corners.

[0091] In the embodiments of the present application, the terms "first", "second", "third", "fourth" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second", "third", "fourth" can explicitly or implicitly include one or more of the features.

[0092] In the embodiments of the present application, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the element defined by the sentence "including a" does not exclude the presence of another identical element in the process, method, article or device including the element.

[0093] In the embodiments of the present application, "and / or" is merely a description of the association relationship between the associated objects, which means that there can be three relationships, for example, A and / or B can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects.

[0094] In the embodiments of the present application, it should be noted that the descriptions of "vertical" and "parallel" respectively represent approximately vertical and approximately parallel within a certain error range, which can be a range of deviation angle less than or equal to 5°, 8° or 10° with respect to absolute vertical and absolute parallel, respectively, which is not specifically limited here.

[0095] With the increasing attention of consumers on the physical health condition and the sports state, electronic devices capable of detecting the physical health condition are increasingly favored by consumers. The detection of the health condition by such electronic devices is mainly realized through photoplethysmography (PPG). When the electronic device is working, the light emitted by the light-emitting device inside the electronic device is transmitted to the user through a light-transmitting part of a portion of the housing cover, and the light reflected by the skin and internal tissues of the user is transmitted to the light detector through another light-transmitting part of another portion of the housing cover, and the electronic product obtains the health information such as the heart rate, blood oxygen, blood pressure and the like of the user by analyzing the effective light information reflected back.

[0096] The present application provides an electronic device, which includes but is not limited to a smart watch, a smart bracelet, smart glasses, smart clothes and the like wearable device, a medical detector, a vital sign detector and the like medical instrument, a mobile phone, a tablet computer, a notebook computer, a laptop computer, a personal digital assistant (PDA), a personal computer, a smart television, a vehicle-mounted device and the like terminal device, and a digital camera, a portable stereo, a radio and the like electronic product.

[0097] Please refer to FIG. 1, which is a structural schematic diagram of an electronic device 100 provided by some embodiments of the present application. In the present embodiment and the following embodiments, the electronic device 100 is exemplarily described as a smart watch having the function of detecting the physiological information of a user, which cannot be considered as a special limitation on the structural form of the electronic device 100. The electronic device 100 includes a watch body 20 and a watchband 10. The watch body 20 is used to realize the main function of the smart watch, and the watchband 10 is used to wear the watch body 20 on the wrist of a human body.

[0098] Please continue to refer to FIG. 1. The watchband 10 can include a first watchband part 11 and a second watchband part 12, one end of the first watchband part 11 and one end of the second watchband part 12 are respectively connected to the opposite two ends of the watch body 20. The other end of the first watchband part 11 is provided with a first locking part 111, and the other end of the second watchband part 12 is provided with a second locking part 121. The first locking part 111 and the second locking part 121 are detachably locked to each other to wear the watch body 20 on the wrist of a human body. The matching structure composed of the first locking part 111 and the second locking part 121 can be a watch buckle structure such as a hook, a snap, a butterfly buckle, a belt press buckle, a folding safety buckle, a folding buckle or a needle buckle, which is not limited in the present application.

[0099] Please refer to FIG. 1 and FIG. 2 together, FIG. 2 is a perspective view of the watch body 20 of the electronic device 100 shown in FIG. 1. The watch body 20 is generally disc-shaped. On this basis, in order to facilitate the description of each embodiment hereinafter, an XYZ coordinate system is established for the watch body 20 described in the present embodiment and each embodiment hereinafter. Specifically, the thickness direction of the watch body 20 is defined as the Z-axis direction, and the plane perpendicular to the Z-axis direction is defined as the XY plane; the position of the watch body 20 for connecting the first watchband part 11 is defined as the first position A, and the position of the watch body 20 for connecting the second watchband part 12 is defined as the second position B, the first position A and the second position B are located in the XY plane, and based on this, the arrangement direction of the first position A and the second position B is defined as the X-axis direction, and the direction perpendicular to the X-axis direction in the XY plane is defined as the Y-axis direction. It can be understood that the coordinate system of the watch body 20 can be flexibly set according to actual needs, which is not specifically limited here. In some other embodiments, the watch body 20 can also be generally elliptical disc-shaped, triangular disc-shaped, polygonal disc-shaped, or rectangular disc-shaped, which is not specifically limited here.

[0100] Please refer to FIG. 2 and FIG. 3 together, FIG. 3 is an exploded view of the watch body 20 shown in FIG. 2. It can be understood that FIG. 2 and FIG. 3 schematically show some components included in the watch body 20, and the actual shape, actual size, actual position and actual structure of these components are not limited by FIG. 2 and FIG. 3. The watch body 20 includes a screen 21, a housing assembly 22, a detection assembly 23 and a circuit board 24.

[0101] The screen 21 is used to display hour, minute, second, digital time, weather, temperature, physiological parameter value or graphics. The screen 21 includes a light-transmitting cover plate 211 and a display screen 212. The light-transmitting cover plate 211 and the display screen 212 are stacked and fixedly connected. The light-transmitting cover plate 211 is mainly used to protect and dustproof the display screen 212. The material of the light-transmitting cover plate 211 includes but is not limited to glass.

[0102] The housing assembly 22 includes a housing 221 and a back cover 222. The back cover 222 forms a cover plate of the electronic device 100, that is, the cover plate is the back cover 222. The housing 221 is a support frame of the watch body 20, and the first position A and the second position B are located on the housing 221. The material of the housing 221 can be stainless steel to ensure the structural strength of the housing 221 and the support strength of other components. In some other embodiments, the material of the housing 221 can also be other materials, which is not limited in the present application.

[0103] Specifically, the shell 221 can be arranged around the screen 21 and the back cover 222. The shell 221 can include a second main body part 2211 and a first protruding part 2212. The second main body part 2211 can be arranged around the screen 21, and the screen 21 is fixed to one end of the second main body part 2211 along the axial direction, i.e., the screen 21 is fixed to one end of the shell 221 along the Z-axis direction. Specifically, the screen 21 can be fixed to the second main body part 2211 by adhesion. The first protruding part 2212 protrudes from the second main body part 2211 to the end away from the screen 21.

[0104] Based on this, the back cover 222 can be fixed to the end of the first protruding part 2212 away from the second main body part 2211, so as to facilitate the contact between the back cover 222 and the user's body, i.e., the back cover 222 is fixed to the other end of the shell 221 along the Z-axis direction and is arranged in layers with the screen 21. Specifically, the back cover 222 can be fixed to the first protruding part 2212 by adhesion, clamping or the like. The back cover 222, the shell 221 and the screen 21 surround the accommodation space 20a for accommodating the detection assembly 23, the circuit board 24 and the like. Among them, the back cover 222 has a first surface 222a and a second surface 222b arranged along the thickness direction (Z-axis direction), i.e., the cover has the first surface 222a and the second surface 222b, the first surface 222a forms part of the inner wall surface of the accommodation space 20a, and the second surface 222b forms part of the outer surface of the electronic device 100. The material of the back cover 222 includes but is not limited to glass.

[0105] In other embodiments, please refer to FIG. 4, which is another perspective view of the watch body 20 of the electronic device 100 shown in FIG. 1. The embodiment shown in FIG. 4 is different from the embodiment shown in FIG. 2 in that the shell 221 does not include the first protruding part 2212, and the back cover 222 is directly fixed to the end of the second main body part 2211 away from the screen 21, i.e., the back cover 222 is the back cover of the whole electronic device 100. The specific structure of the shell 221 is not limited in the present application.

[0106] Please refer back to FIG. 3, the circuit board 24 is located in the aforementioned accommodating space 20a. The circuit board 24 serves as an operation control processing center in the electronic device 100, that is, the circuit board 24 can be a main circuit board of the electronic device 100. The circuit board 24 can be a hard circuit board, a flexible circuit board, or a combination of hard and soft circuit boards. The circuit board 24 is used to arrange electronic components and realize electrical connection between the electronic components. The electronic components can include, but are not limited to, a central processing unit (CPU) 241, a graphics processing unit (GPU), a universal flash storage (UFS), and the like.

[0107] The detection assembly 23 is located in the aforementioned accommodating space 20a, and in the case that the shell 221 includes the first protruding portion 2212, the detection assembly 23 can be located in the first protruding portion 2212. The detection assembly 23 can be a photo plethysmography (PPG) assembly. The detection assembly 23 includes a light emitting device 231 and a light detector 232, and the light detector 232 forms a light receiving component, that is, the light receiving component is the light detector 232. The light emitting device 231 and the light detector 232 can be fixed on the circuit board 24. The light emitted by the light emitting device 231 can pass through the light-transmitting portion on the back cover 222 and be directed to the user's skin, and the light emitting device 231 can emit red light, green light, infrared light, etc. The red light can be used to detect the blood oxygen of the human body, the green light can be used to detect the heart rate of the human body, and the infrared light can be used to detect the body temperature of the human body. The light emitting device 231 can be a light emitting diode (LED), an organic light emitting diode, a laser transmitter (transmitter optical, to), etc., and the specific type of the light emitting device 231 is not limited in the present application.

[0108] The light detector 232 can be arranged apart from the light emitting device 231. The light detector 232 can receive light reflected by the user's body or ambient light. The light detector 232 can be a photodiode (PD), a phototube, a photomultiplier tube, a photoresistor, a phototriode, etc., and the specific type of the light detector 232 is not limited in the present application.

[0109] Specifically, refer to FIG. 5, which is a schematic diagram of the principle of detecting the heart rate of a user by the electronic device 100 shown in FIG. 1. Take the electronic device 100 detecting the heart rate of a user as an example. The light emitted by the light emitting device 231 in the electronic device 100 is directed to the skin 200 of the user. The light passes through the muscle tissue 210, the artery 220 and the vein (not shown in FIG. 5) in the skin 200 of the user. Part of the light is absorbed by the muscle tissue 210, the artery 220 and the vein in the skin 200 of the user. Another part of the light is reflected by the muscle tissue 210, the artery 220 and the vein in the skin 200 of the user. The reflected light is received by the light detector 232. Since the absorption of light by the muscle tissue 210, the bone, the vein and other tissues is basically unchanged (if the measurement site does not have a large movement), but the artery 220 is different. Since the blood in the artery 220 is flowing, the absorption of light naturally changes (as shown in FIG. 5, C represents that the artery 220 can not absorb light at this time, and D represents that the artery 220 can absorb part of the light at this time). Therefore, when the light detector 232 converts the light signal of the reflected light into an electrical signal, since the absorption of light by the artery 220 changes and the absorption of light by other tissues is basically unchanged, the light detector 232 converts the light signal of the light reflected from the artery 220 into an alternating current AC signal, and converts the light signal of the light reflected from other tissues into a direct current DC signal. The alternating current AC signal reflects the characteristics of blood flow, so that the pulse waveform can be obtained, and then the heart rate can be calculated, thereby enabling the electronic device 100 to detect the heart rate.

[0110] In order to make as much light as possible in the light received by the light detector 232 be light reflected from the user's body, prevent light from being reflected by the back cover 222 directly into the light detector 232 to cause light crosstalk, and cause the electronic device 100 to have a low signal-to-noise ratio and low detection accuracy of the user's physiological information, please refer to FIG. 6, which is a sectional view of the watch body 20 shown in FIG. 2 at the E-E line. The back cover 222 is a light-transmitting structure, and the shell assembly 22 further includes a light-blocking member 223. The light-blocking member 223 is arranged on the first surface 222a of the back cover 222 and has a first through hole 223a and a second through hole 223b arranged at intervals. In the Z-axis direction, the first through hole 223a is arranged opposite to the light-emitting device 231, and the second through hole 223b is arranged opposite to the light detector 232, so that part of the light emitted by the light-emitting device 231 is transmitted from the first through hole 223a and the back cover 222 to the user's skin 200, and the other part is transmitted to the light-blocking member 223 and absorbed by the light-blocking member 223. Specifically, the light-blocking member 223 can be a silk screen or an ink layer transferred to the first surface 222a of the back cover 222, or a plastic film attached to the first surface 222a of the back cover 222. In this way, the amount of light reflected by the back cover 222 to the light detector 232 can be reduced, which is conducive to improving the signal-to-noise ratio of the electronic device 100 and further improving the detection accuracy of the user's physiological information by the electronic device 100.

[0111] However, the light-blocking member 223 can only be arranged on the first surface 222a of the back cover 222 and cannot be arranged inside the back cover 222. Part of the light emitted by the light-emitting device 231 will enter the inside of the part of the back cover 222 that is shielded by the light-blocking member 223 and be reflected into the light detector 232, causing the electronic device 100 to still have a low signal-to-noise ratio and further causing the electronic device 100 to still have low detection accuracy of the user's physiological information. In addition, the light-blocking member 223 is prone to aging and falling off the surface of the back cover 222, which reduces the light-blocking performance of the light-blocking member 223 and further reduces the reliability of the back cover 222.

[0112] To solve this problem, please refer to FIG. 7, which is another sectional view of the watch body 20 shown in FIG. 2 at the line E-E. The embodiment shown in FIG. 7 differs from the embodiment shown in FIG. 6 in that the back cover 222 comprises a body part 2221 and an inlaid part 2222. The body part 2221 has a third through hole 2221a and a fourth through hole 2221b arranged at intervals, one third through hole 2221a being arranged opposite the light emitting device 231 and one fourth through hole 2221b being arranged opposite the at least one light detector 232. A part of the light shielding member 223 is arranged on the surface of the body part 2221 facing the circuit board 24, and another part is arranged on the hole wall of the third through hole 2221a and the hole wall of the fourth through hole 2221b. On this basis, an inlaid part 2222 is inlaid in each third through hole 2221a and each fourth through hole 2221b. In this way, it is possible to prevent the light emitted by the light emitting device 231 from entering the inside of the body part 2221 and then entering the light detector 232 after being reflected, causing light crosstalk and leading to a decrease in the accuracy of the electronic device 100 in detecting the physiological information of the user.

[0113] However, this structure requires the back cover 222 to be punched to form the third through hole 2221a and the fourth through hole 2221b through a cold working process, and then the ink layer is printed or transferred as the light shielding member 223, and then the inlaid part 2222 is assembled, etc. The manufacturing process is complex, the manufacturing efficiency is low, the cost is high, and the back cover 222 is a split structure with low integration precision and low reliability.

[0114] To solve the above problems, please refer to FIG. 8, which is a structural view of the back cover 222 of the watch body 20 shown in FIG. 2. The back cover 222 comprises a cover plate body 2223, which comprises a light-transmitting part 22231 and a light-shielding part 22232 (the shaded area in FIG. 8) arranged along the thickness direction (Z-axis direction) perpendicular to the back cover 222. Among them, the light-transmitting part 22231 comprises a first light-transmitting part 22231a and a second light-transmitting part 22231b arranged at intervals, specifically, the second light-transmitting part 22231b is located on the side of the first light-transmitting part 22231a. A part of the light-shielding part 22232 is connected between the first light-transmitting part 22231a and the second light-transmitting part 22231b, i.e. the first light-transmitting part 22231a and the second light-transmitting part 22231b are separated by the light-shielding part 22232, and another part of the light-shielding part 22232 is connected to the side of the second light-transmitting part 22231b away from the first light-transmitting part 22231a. In some other embodiments, the light-shielding part 22232 can also be entirely connected between the first light-transmitting part 22231a and the second light-transmitting part 22231b.

[0115] In the embodiment shown in FIG. 8, the first light-transmissive portion 22231a is one in number and has a circular shape, and the light-emitting device 231 has a light-emitting surface facing the first light-transmissive portion 22231a. The second light-transmissive portion 22231b is a plurality in number and is arranged at intervals around the first light-transmissive portion 22231a, and has a circular shape. The number of the second light-transmissive portion 22231b can correspond to the number of the light detector 232 one by one, and the light detector 232 has a light-receiving surface facing the second light-transmissive portion 22231b. That is, the light-emitting device 231 and the light-receiving component of the electronic device 100 face the light-transmissive portion 22231. In other embodiments, the first light-transmissive portion 22231a can also have a rectangular, triangular or other shape. The second light-transmissive portion 22231b can also have a rectangular, triangular or other shape. In still other embodiments, the number of the second light-transmissive portion 22231b can be less than the number of the light detector 232, and one second light-transmissive portion 22231b faces the light-receiving surface of one or more light detectors 232. In still other embodiments, please refer to FIG. 9, which is another structure diagram of the back cover 222 of the watch body 20 shown in FIG. 2. The number of the second light-transmissive portion 22231b can also be one, and the second light-transmissive portion 22231b has a ring shape, and faces the light-receiving surface of all the light detectors 232.

[0116] The cover plate body 2223 is made of glass. Specifically, the components of the glass include SiO2, Al2O3, alkali metal oxide, Ce2O3 and colorant.

[0117] SiO2, as the main component of the glass, is an important glass-forming oxide, and forms an irregular continuous network structure with a silicon-oxygen tetrahedron (SiO4) structural unit, which becomes the skeleton of the glass and gives the glass better structural stability, chemical stability and mechanical properties. The content of SiO2 directly affects the development of the network structure. The higher the content of SiO2 in the glass, the denser the glass network structure, and the better the structural stability, chemical stability and mechanical properties of the glass. SiO2 can be introduced in the form of SiO2 in the raw materials for preparing the glass.

[0118] Al2O3 is a network intermediate of the glass, participates in the formation of the network structure, thereby strengthening the network structure, and is conducive to improving the mechanical properties and chemical durability of the glass. Because the volume of the aluminum oxygen tetrahedron (AlO4) is larger than the volume of the silicon oxygen tetrahedron, by adding Al2O3, a larger gap can be generated in the glass structure, making it easier for the exchange ions to move, and thus the ion exchange performance can be improved, that is, the effect of chemical strengthening of the glass can be improved, and in turn the mechanical properties of the glass can be improved. Al2O3 can be introduced in the form of Al2O3 or Al(OH)3 in the raw materials for preparing the glass. When introduced in the form of Al(OH)3, Al(OH)3 can be thermally decomposed to generate Al2O3 in the process of preparing the glass.

[0119] In some examples, the sum of the mass fraction of SiO2 and the mass fraction of Al2O3 is greater than or equal to 60% and less than or equal to 88%. For example, the sum of the mass fraction of SiO2 and the mass fraction of Al2O3 can be 60%, 62%, 64%, 66%, 68%, 70%, 72%, 74%, 76%, 78%, 80%, 80.09%, 80.2%, 80.14%, 80.19%, 82%, 84%, 86%, 88%, etc.

[0120] The alkali metal oxide is conducive to reducing the viscosity of the glass in the process of preparing the glass, and promotes the glass to melt and clarify quickly. Specifically, the alkali metal oxide can include Li2O, Na2O and K2O. Li2O belongs to the network external oxide, which is conducive to reducing the viscosity of the glass, and also helps to form a lithium metasilicate crystal phase in the process of crystallization, which is conducive to improving the strength of the glass. In addition, Li2O also helps to have sufficient Li+ in the glass to exchange with Na+ in the process of chemical strengthening, to form a Na / Li ion exchange layer with high compressive stress, so as to improve the hard-penetrating strength of the glass. Na2O and K2O are conducive to reducing the viscosity of the glass, and also help to have sufficient Na+ in the glass to exchange with K+ in the process of chemical strengthening, to form a K / Na ion exchange layer with high compressive stress, so as to improve the hard-penetrating strength of the glass. The alkali metal oxide can be introduced in the form of an alkali metal carbonate in the raw materials for preparing the glass, and the alkali metal carbonate can be thermally decomposed to generate the alkali metal oxide in the process of preparing the glass. In other embodiments, the alkali metal oxide can also only include one or two of Li2O, Na2O and K2O.

[0121] In some examples, the mass fraction of the alkali metal oxide is greater than or equal to 8% and less than or equal to 30%. For example, the mass fraction of the alkali metal oxide can be 8%, 10%, 12%, 14%, 16%, 16.5%, 18%, 20%, 22%, 24%, 26%, 28%, 30%, etc.

[0122] The colorant includes at least one of Ag2O and Au2O. Specifically, the colorant can include only Ag2O, only Au2O, or both Ag2O and Au2O. The Ag2O can be introduced in the form of Ag2O or AgNO3 in the raw materials for preparing the glass, and when introduced in the form of AgNO3, the AgNO3 can be thermally decomposed to generate Ag2O in the process of preparing the glass. Likewise, the Au2O can be introduced in the form of Au2O or AuNO3 in the raw materials for preparing the glass, and when introduced in the form of AuNO3, the AuNO3 can be thermally decomposed to generate Au2O in the process of preparing the glass.

[0123] The Ce2O3 is used to reduce the metal cations (Ag+, Au+) in the colorant to metal atoms (Ag, Au) under light irradiation of ultraviolet light or infrared light, and the metal atoms are used to make the light transmittance of the corresponding glass after the light irradiation less than that before the light irradiation. The specific principle is as follows: taking the case where the colorant includes only Ag2O as an example, the Ce2O3 can act as a photosensitizer, and under irradiation of ultraviolet light or infrared light, Ce3+ absorbs the ultraviolet light or infrared light to generate Ce4+ and an electron, i.e., Ce3++ hv→ Ce4++ e-. Based on this, Ag+ combines with the electron to be reduced to Ag, i.e., Ag++ e-→ Ag0, and the overall equation can be written as Ce3++ hν+ Ag+→ Ce4++ Ag0. The Ag atoms have a certain absorption effect on light, so that the light transmittance of the glass after the light irradiation is less than that before the light irradiation. Next, in a further heat treatment process, the Ag atoms are aggregated in a cluster state, further improving the absorption effect on light, thereby further reducing the light transmittance of the glass. In addition, in the case where Li2O is included in the composition of the glass, in the further heat treatment process, the Ag atoms in a dispersed state and the Ag atoms in a cluster state in the glass will form lithium metasilicate nanocrystalline particles as crystal nuclei, further improving the absorption effect of the glass on light, thereby further reducing the light transmittance of the glass.

[0124] In addition, since the metal cations (Ag+, Au+) in the colorant are colorless, it is beneficial to ensure the light transmittance of the glass before the light irradiation. Finally, in the case where the colorant is Ag2O, the silver ions in the glass can also have a certain inhibitory and killing effect on a variety of bacteria (such as Staphylococcus aureus, Escherichia coli, etc.), which is beneficial to maintain the health of the user.

[0125] Ce2O3 can be introduced in the form of CeO4 in the raw materials for preparing the glass, which prevents Ce2O3 from being directly introduced into the raw materials, and in the process of preparing the glass, the more active Ce3+ is oxidized to Ce4+, which results in a lower concentration of Ce3+ in the prepared glass and fails to achieve the purpose of reducing the light transmittance of the glass after light treatment. In this case, the composition of the glass further includes a small amount of CeO4.

[0126] In some examples, the mass fraction of the aforementioned colorant is greater than or equal to 0.0001% and less than or equal to 0.5%, the mass fraction of Ce2O3 is greater than or equal to 0.0001% and less than or equal to 0.3%. Further, the sum of the mass fraction of Ce2O3 and the mass fraction of CeO4 is greater than or equal to 0.0001% and less than or equal to 0.3%. For example, the mass fraction of the colorant can be 0.01%, 0.05%, 0.1%, 0.15%, 0.2%, 0.25%, 0.3%, 0.35%, 0.4%, 0.5%, etc. The mass fraction of Ce2O3 can be 0.01%, 0.05%, 0.1%, 0.15%, 0.2%, 0.25%, 0.3%, etc. It should be noted that the content of the colorant can be adjusted according to the demand for the light transmittance of the glass after light treatment, and the content of Ce2O3 is adjusted adaptively. In this way, it can be prevented that Ce2O3 and CeO4 are too much, and the colored Ce ions result in a lower light transmittance of the glass.

[0127] On the basis of the above, the composition of the glass further includes a reducing agent, which is used to reduce Ce4+ to Ce3+ in the process of preparing the glass, and adjust the balance of Ce4+ and Ce3+ so that the prepared glass has a sufficient concentration of Ce3+ to reduce the metal cations in the colorant to obtain a sufficient concentration of metal atoms, and obtain a glass with a light transmittance meeting the requirements. The reducing agent can include one or two or three of Sb2O3, SnO and Bi2O3. In addition, in the case where Sb2O3 is included in the reducing agent, Sb2O3 can also act as a fining agent in the process of preparing the glass, and expel bubbles out of the glass body through chemical reactions at different temperatures. Sb2O3, SnO and Bi2O3 can be introduced in the form of Sb2O3, SnO and Bi2O3 respectively in the raw materials for preparing the glass.

[0128] In some examples, the sum of the mass fraction of Sb2O3, the mass fraction of SnO and the mass fraction of Bi2O3 can be greater than or equal to 0.0001% and less than or equal to 1%. For example, the mass fraction of the reducing agent can be 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.61%, 0.7%, 0.8%, 0.9%, 1%, etc.

[0129] On the basis of the above, the glass composition can further include an alkaline earth metal oxide. The alkaline earth metal oxide helps to reduce the melting temperature of the glass during the preparation of the glass, to improve the glass-forming ability of the glass, and to reduce energy consumption and save costs. The alkaline earth metal oxide can be introduced in the form of an alkaline earth metal carbonate in the raw materials for preparing the glass, and the alkaline earth metal carbonate can be decomposed by heat to generate the alkaline earth metal oxide during the preparation of the glass. Specifically, the alkaline earth metal oxide includes one or more of MgO, CaO, SrO, and BaO. In some examples, the mass fraction of the alkaline earth metal oxide is greater than 0 and less than or equal to 5%. For example, the mass fraction of the alkaline earth metal oxide can be 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, etc.

[0130] On the basis of the above, the glass composition further includes at least one of ZnO and ZrO2. ZrO2 can further improve the viscosity, hardness, elasticity, refractive index, and chemical stability of the glass, and reduce the thermal expansion coefficient of the glass, thereby being beneficial to improving the chemical stability and thermal stability of the glass, and being beneficial to improving the alkali resistance of the glass. ZrO2 can be introduced in the form of ZrO2 in the raw materials for preparing the glass.

[0131] ZnO can reduce the thermal expansion coefficient of the glass, and be beneficial to improving the chemical stability, thermal stability, and refractive index of the glass. Generally, ZnO takes zinc-oxygen octahedron as the network outer oxide, and when there is sufficient free oxygen in the glass, a network structure of zinc-oxygen tetrahedron can be formed, making the structure of the glass more stable.

[0132] In addition, ZrO2 and ZnO are also beneficial to inhibiting surface crystallization during the forming and cooling process, and are beneficial to the crystallization control during the heat treatment process, thereby being able to inhibit the formation of lithium metasilicate nanocrystalline particles with metal atoms in a dispersed state and metal atoms in an agglomerated state as nuclei during the heat treatment of the glass after the light treatment, and thereby preventing the performance of the entire glass structure from being uneven due to the difference in the microstructure between the part subjected to the light treatment and the part not subjected to the light treatment in the structure formed from the glass. ZnO can be introduced in the form of ZnCO3 in the raw materials for preparing the glass, and ZnCO3 can be decomposed by heat to generate ZnO during the preparation of the glass.

[0133] In some examples, the sum of the mass fraction of ZrO2 and the mass fraction of ZnO is greater than 0 and less than or equal to 5%. For example, the sum of the mass fraction of ZrO2 and the mass fraction of ZnO can be 0.7%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, etc. In other embodiments, the composition of the glass can not include ZnO and ZrO2.

[0134] The above components are uniformly distributed in the glass. In this way, the structure and performance of the glass are uniform throughout, without discontinuity or obvious stratification. For example, any region of the same thickness has the same light transmittance. In this way, the performance parameters of the parts of the structure formed by the glass are consistent when not subjected to light treatment.

[0135] On this basis, the light shielding part 22232 of the cover plate body 2223 can be formed by the aforementioned glass subjected to light treatment of ultraviolet light or infrared light, and the light transmissive part 22231 of the cover plate body 2223 can be formed by the aforementioned glass not subjected to light treatment. That is, the components of the light transmissive part 22231 of the cover plate body 2223 are the same as those of the aforementioned glass, and the components of the light shielding part 22232 include metal atoms obtained by reduction of metal cations in the aforementioned colorant, and the light transmittance of the light shielding part 22232 is less than that of the light transmissive part 22231. In this way, the light transmissive part 22231 and the light shielding part 22232 of the cover plate body 2223 can be formed by the same glass substrate, and the light shielding part 22232 is formed by light treatment of the glass substrate, so that the light transmittance of the light shielding part 22232 is less than that of the light transmissive part 22231. In this way, compared with the scheme of setting an ink layer on the light transmissive part to achieve the light shielding effect, the amount of light emitted by the light emitting device 231 that is reflected inside the light shielding part 22232 and enters the light detector 232 (also referred to as the amount of light leakage) is effectively reduced, the signal-to-noise ratio of the electronic device 100 is improved, and the accuracy of detection of physiological information of the user by the electronic device 100 is improved. In addition, the light shielding performance of the light shielding part 22232 of the present application is not easy to fail, and the light shielding reliability of the light shielding part 22232 is good.

[0136] On this basis, the cover plate body 2223 can be formed by the same glass substrate, that is, the light shielding part 22232 is integrally formed with the first light transmissive part 22231a and the second light transmissive part 22231b. In this way, the light shielding part 22232 is chemically bonded with the first light transmissive part 22231a and the second light transmissive part 22231b, has the same element composition and continuous and uniform internal and external structure, and there is no splicing interface. The cover plate body 2223 has high integration precision, and therefore, the mechanical and chemical properties of the light shielding part 22232 and the light transmissive part 22231 are uniform and consistent, and the reliability is good. In other embodiments, the cover plate body 2223 can also be formed by splicing the light shielding part 22232, the first light transmissive part 22231a and the second light transmissive part 22231b.

[0137] Referring to FIG. 10, FIG. 10 is a curve diagram of the transmittance of the light shielding portion and the light transmitting portion of the cover plate body 2223 and the wavelength of the light. The transmittance of the first light transmitting portion 22231a and the second light transmitting portion 22231b is greater than or equal to 80% for the light with the wavelength of 400nm-1000nm. That is, the transmittance of the aforementioned glass is greater than or equal to 80%. Specifically, the transmittance of the glass is greater than or equal to 80% for the light with the wavelength of 530nm, 660nm and 940nm. Further, the transmittance of the glass is greater than or equal to 85% for the light with the wavelength of 530nm, 660nm and 940nm. Further, the transmittance of the glass is greater than or equal to 90% for the light with the wavelength of 530nm, 660nm and 940nm. In this way, the light emitted by the light emitting device can be transmitted to the user's skin as much as possible, and the light reflected by the user's body can be transmitted to the light detector 232 as much as possible, which is conducive to improving the detection accuracy of the physiological information of the user by the electronic device.

[0138] The transmittance of the light shielding portion 22232 is less than or equal to 10% for the light with the wavelength of 400nm-1000nm. Specifically, the transmittance of the light shielding portion 22232 is less than or equal to 10% for the light with the wavelength of 530nm, 660nm and 940nm. Further, the transmittance of the light shielding portion 22232 is less than or equal to 5% for the light with the wavelength of 530nm, 660nm and 940nm. Further, the transmittance of the light shielding portion 22232 is less than or equal to 1% for the light with the wavelength of 530nm, 660nm and 940nm. In this way, the amount of light emitted by the light emitting device 231 that is reflected in the light shielding portion 22232 and enters the light detector 232 can be effectively reduced, the signal-to-noise ratio of the electronic device 100 is improved, and the accuracy of the detection of the physiological information of the user by the electronic device 100 is improved.

[0139] On the basis of the above, in the light shielding portion 22232, the ratio of the number of metal atoms obtained by reduction of metal cations in the colorant to the sum of the number of metal atoms and the number of metal cations remaining in the colorant is greater than or equal to 50%. For example, the ratio can be 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, and the like. It should be noted that the type and valence state of the metal element in the light shielding portion 22232 and the content can be measured by X-ray photoelectron spectroscopy (XPS). In this way, the mass fraction of the colorant and Ce2O3 in the glass is within the predetermined range to ensure that the light transmittance of the light transmitting portion 22231 is formed, and the higher the concentration of metal atoms in the light shielding portion 22232, the lower the light transmittance of the light shielding portion 22232, the less the amount of light that is reflected in the light shielding portion 22232 and transmitted to the light detector 232 by the light emitting device 231, which is beneficial to improve the signal-to-noise ratio of the electronic device 100, and thus improve the detection accuracy of the user's physiological information.

[0140] Correspondingly, in the light transmitting portion 22231, the ratio of the number of metal cations in the colorant to the sum of the number of metal cations and the number of metal atoms is greater than 50%.

[0141] On the basis of the above, referring to FIG. 11, FIG. 11 is a sectional structure diagram of the back cover 222 at the F-F line in FIG. 8. The surface layer of the cover plate body 2223 is an ion exchange layer 22233. Specifically, the cover plate body 2223 can include a first body portion 22234 and the ion exchange layer 22233. Part of the first body portion 22234 forms part of the light shielding portion 22232, and another part of the first body portion 22234 forms part of the light transmitting portion 22231. The ion exchange layer 22233 is formed on the surface of the first body portion 22234, part of the ion exchange layer 22233 forms another part of the light shielding portion 22232, and another part of the ion exchange layer 22233 forms another part of the light transmitting portion 22231.

[0142] The ion exchange layer 22233 can be formed by chemical strengthening. Chemical strengthening (also known as ion exchange), commonly known as chemical tempering, the main principle is to exchange the larger radius ions (such as potassium ions) in the molten salt with the smaller radius ions (such as sodium ions) in the glass, and form a layer of compressive stress on the surface of the glass through the "crowding effect", and form an ion exchange layer (also known as a compressive stress layer) with a certain depth. The ion exchange layer 22233 can include a potassium ion exchange layer formed by exchanging potassium ions in a molten potassium salt with sodium ions in the cover plate body 2223, can also include a sodium ion exchange layer formed by exchanging sodium ions in a molten sodium salt with lithium ions in the cover plate body 2223, and can also include both a potassium ion exchange layer and a sodium ion exchange layer.

[0143] In this way, the surface of the cover plate body 2223 can obtain a certain compressive stress. When the cover plate body 2223 is subjected to an external force, the compressive stress on the surface of the cover plate body 2223 needs to be offset first, and then the cover plate body 2223 is in a tensile state. In addition, the surface layer of the cover plate body 2223 is the ion exchange layer 22233, which can effectively eliminate or inhibit the expansion of cracks, thereby improving the ability of the cover plate body 2223 to resist external force, and significantly enhancing the strength of the cover plate body 2223.

[0144] In some examples, the thickness of the ion exchange layer 22233 can be greater than or equal to 0.01t and less than or equal to 0.22t; wherein t is the thickness of the cover plate body 2223. For example, the thickness of the ion exchange layer 22233 is 0.01t, 0.04t, 0.06t, 0.08t, 0.1t, 0.12t, 0.14t, 0.16t, 0.18t, 0.20t, 0.22t, etc. In this way, the ability of the cover plate body 2223 to resist external force can be improved as much as possible, and the reliability of the entire electronic device 100 can be improved. In other embodiments, the cover plate body 2223 can also not include the ion exchange layer 22233. It should be noted that the depth of the ion exchange layer 22233 can be tested by analyzing the element (such as potassium or sodium) content of the cross section of the cover plate body 2223 by electron probe microanalysis (EPMA) or scanning electron microscope energy dispersive spectrometer (SEM-EDS).

[0145] On the basis of the above, please refer to FIG. 12 and FIG. 13 as well, FIG. 12 is another structural diagram of the back cover 222 of the watch body 20 shown in FIG. 2, and FIG. 13 is a structural diagram of the back cover 222 shown in FIG. 12 from another perspective. The back cover further comprises a first electrode 2224, a second electrode 2225 and an ink layer 2226. The first electrode 2224 and the second electrode 2225 are arranged on the cover plate body 2223, and part of the surface of the first electrode 2224 forms part of the second surface 222b of the back cover 222. The second electrode 2225 is arranged on the cover plate body 2223, and part of the surface of the second electrode 2225 forms part of the second surface 222b. Specifically, the first electrode 2224 and the second electrode 2225 can be formed by electroplating conductive materials (such as chromium carbide, chromium nitride) on the surface of the cover plate body 2223 by magnetron sputtering. Part of the first electrode 2224 forms part of the second surface 222b of the back cover 222, and the part of the first electrode 2224 opposite to the second surface 222b of the cover plate body 2223 is electrically connected to the central processor 241 of the electronic device 100. Similarly, part of the second electrode 2225 forms part of the second surface 222b of the back cover 222, and the part of the second electrode 2225 opposite to the second surface 222b of the cover plate body 2223 is electrically connected to the central processor 241 of the electronic device 100. The first electrode 2224 and the second electrode 2225 can be electrocardiogram electrodes, which can detect the electrical signals of the user's skin 200, and form the electrocardiogram of the user after being analyzed and processed by the central processor 241 of the electronic device 100.

[0146] Please continue to refer to FIG. 12 and FIG. 13, the ink layer 2226 is arranged on one surface of the cover plate body 2223. Specifically, the ink layer 2226 is arranged on the surface of the cover plate body 2223 opposite to the second surface 222b of the back cover 222, and the ink layer 2226 forms part of the first surface 222a of the back cover 222. Part of the ink layer 2226 is arranged around the light-transmitting part 22231 on the edge area of the surface of the cover plate body 2223, and the outer side of the ink layer 2226 is flush with the outer side of the cover plate body 2223. Another part of the ink layer 2226 covers the area of the surface of the light-blocking part 22232 which is not covered by the aforementioned part of the ink layer 2226. Exemplarily, the ink layer 2226 can be formed on the cover plate body 2223 by silk-screen printing or transfer printing. In this way, when the back cover 222 is bonded to the shell 221, the ink layer 2226 can increase the bonding strength between the back cover 222 and the shell 221. In addition, the ink layer 2226 can further shield the components inside the electronic device 100, which is conducive to improving the visual effect of the appearance of the electronic device 100. In some other embodiments, the ink layer 2226 can only include the part on the edge area of the surface of the cover plate body 2223.

[0147] In some examples, the light transmittance of the ink layer 2226 is less than the light transmittance of the light shielding portion 22232. In this way, the amount of light emitted by the light emitting device 231 that is reflected at the surface of the light shielding portion 22232 and transmitted to the light detector 232 (i.e., the amount of light leakage) can be further reduced, which can improve the signal-to-noise ratio of the electronic device 100 and thus improve the detection accuracy of the physiological information of the user.

[0148] In the case where the cover plate further includes the first electrode 2224 and the second electrode 2225, the ink layer 2226 can cover the first electrode 2224 and the second electrode 2225 to protect the first electrode 2224 and the second electrode 2225 and insulate the first electrode 2224 and the second electrode 2225 from other components, which can ensure the safety and reliability of the electronic device 100. In other embodiments, the back cover 222 can not include the first electrode 2224 and the second electrode 2225, and in yet other embodiments, the back cover 222 can not include the ink layer 2226.

[0149] On the basis of the above, in some embodiments, referring to FIG. 14, FIG. 14 is a sectional view of the back cover 222 shown in FIG. 12 at the G-G line. The back cover 222 can be a 2D back cover, i.e., the first surface 222a and the second surface 222b of the back cover 222 are both substantially planar, which can facilitate design and processing. It should be noted that the second surface 222b of the back cover 222 is substantially planar means that the area of the second surface 222b formed by the cover plate body 2223 can be located in the same plane as the area of the first surface 222a formed by the first electrode 2224 and the second electrode 2225, i.e., each point on the second surface 222b is located in the same plane; or the surface of the cover plate body 2223 opposite to the first surface 222a is planar, and the height of the first electrode 2224 and the second electrode 2225 protruding from the cover plate body 2223 is less than or equal to 0.2 millimeters, i.e., the height difference of each point on the second surface 222b in the Z-axis direction is less than or equal to 0.2 millimeters. The first surface 222a of the back cover 222 is substantially planar means that the height difference of each point on the first surface 222a in the Z-axis direction is less than or equal to 0.2 millimeters.

[0150] In some other embodiments, please refer to FIG. 15, which is another sectional structure diagram of the back cover 222 at the line G-G shown in FIG. 12. The back cover 222 can be a 3D structure. Specifically, the second surface 222b is gradually convex in a direction from the outer edge to the central area and in a direction away from the first surface 222a, and the first surface 222a is gradually concave in a direction from the outer edge to the central area and in a direction close to the second surface 222b. In this way, it is beneficial for the back cover 222 to contact the user's skin 200, and in the case that the electronic device 100 is a wearable device and the first light-transmitting part 22231a is located at the central area of the back cover 222, it is beneficial for preventing the back cover 222 from sliding relative to the user's skin 200, so as to cause the detection accuracy of the user's physiological information by the electronic device 100 to be low. In addition, it is also beneficial for reducing the distance between the light-emitting device 231 and the light detector 232 and the user's skin 200, so as to reduce the loss of light in the propagation process, thereby being beneficial for improving the detection accuracy of the user's physiological information by the electronic device 100.

[0151] The foregoing embodiments take the back cover 222 of the smart watch as an example to describe the structure of the cover plate in detail. In some other embodiments, please refer to FIG. 16, which is a structure diagram of the light-transmitting cover plate 211 of the watch body 20 shown in FIG. 3. In the embodiment shown in FIG. 16, the cover plate can be the light-transmitting cover plate 211 of the screen 21, the surface of the light-transmitting cover plate 211 facing away from the display screen is the second surface 222b, the light-transmitting cover plate 211 can not include the second light-transmitting part, the light-shielding part 22232 is located at the periphery of the first light-transmitting part 22231a and is arranged around the first light-transmitting part 22231a, the light-emitting component is the display screen, and the first light-transmitting part 22231a of the light-transmitting cover plate 211 is opposite to the light-emitting surface of the display screen, for transmitting the light of the display screen so that the user can watch the images, videos, etc. displayed by the display screen 212.

[0152] In some other embodiments, please refer to FIG. 17, which is another structure diagram of the light-transmitting cover plate 211 of the watch body 20 shown in FIG. 3. The difference between the embodiment shown in FIG. 17 and the embodiment shown in FIG. 16 is that in the case that the electronic device 100 further includes a front camera module (not shown in the figure), the light-receiving component can be the camera module, the light-transmitting part 22231 of the light-transmitting cover plate 211 further includes a second light-transmitting part 22231b, the first light-transmitting part 22231a is located at the periphery of the second light-transmitting part 22231b, a part of the light-shielding part 22232 is arranged around the first light-transmitting part 22231a, and another part of the light-shielding part 22232 is arranged around the second light-transmitting part 22231b, the light-emitting surface of the display screen faces the first light-transmitting part 22231a, and the light-incident surface of the camera module faces the second light-transmitting part 22231b.

[0153] In other embodiments, the electronic device 100 can also be an electronic device 100 that is unable to detect user physiological information, i.e., the electronic device 100 can also not include the detection assembly 23, and the back cover 222 can not include the first electrode 2224 and the second electrode 2225.

[0154] The following describes a method for manufacturing the cover plate, taking the aforementioned back cover 222 as an example. Referring to FIG. 18 and FIG. 19, FIG. 18 is a flowchart of a method for manufacturing a cover plate according to the present application, and FIG. 19 is a structural schematic diagram of the method for manufacturing a cover plate according to the present application. The method for manufacturing a cover plate includes steps S10-S60.

[0155] S10: providing a glass 400, the composition of which is described above and will not be repeated here.

[0156] In some embodiments, step S10 includes steps S11-S13, i.e., the method for manufacturing a glass includes steps S11-S13.

[0157] S11: mixing raw materials for preparing a glass and melting at a melting temperature to obtain a glass liquid. The raw materials for preparing a glass can refer to the description above and will not be repeated here. A reducing agent can be introduced into the glass raw materials to deaerate during the melting process, and the glass liquid can be homogenized by stirring. The composition and addition amount of the reducing agent can refer to the description above and will not be repeated here. Specifically, the melting temperature can be greater than or equal to 1400°C and less than or equal to 1600°C. For example, the melting temperature can be 1400°C, 1450°C, 1500°C, 1550°C, 1600°C, etc.

[0158] S12: cooling and forming the glass liquid to obtain a glass base 300. Specifically, the glass base 300 can be formed by a float method, a down-draw method, a pressing method, or a casting method, which is not limited by the present application.

[0159] S13: annealing the glass base 300 at an annealing temperature to obtain a glass 400. Specifically, the annealing temperature can be greater than or equal to 350°C and less than or equal to 550°C. For example, the annealing temperature can be 350°C, 400°C, 450°C, 500°C, 550°C, etc.

[0160] Specifically, the shape of the glass 400 can be substantially the same as that of the aforementioned cover plate body 2223, and the size of the glass 400 can be substantially the same as that of the cover plate body 2223. In some examples, the shape and size of the glass substrate 300 can be the same as those of the cover plate body 2223. In other examples, the shape and size of the glass substrate 300 can also be different from those of the cover plate body 2223. The glass substrate 300 can be in the form of a plate or a block. In step S13, the glass 400 can be obtained by mechanically cutting the glass substrate 300 after annealing treatment.

[0161] S20: performing light treatment on the first portion 410 of the glass 400 with ultraviolet light or infrared light, so that the first portion 410 forms the light-shielding portion 22232, and the portions of the glass 400 other than the first portion 410 form the light-transmitting portion 22231; wherein the light transmittance of the light-shielding portion 22232 is less than that of the light-transmitting portion 22231. In this way, the light-transmitting portion 22231 and the light-shielding portion 22232 are formed in an integral structure. Specifically, the light-transmitting portion 22231 includes a first light-transmitting portion 22231a and a second light-transmitting portion 22231b, and at least a portion of the light-shielding portion 22232 is connected between the first light-transmitting portion 22231a and the second light-transmitting portion 22231b. The specific structure between the light-shielding portion 22232, the first light-transmitting portion 22231a and the second light-transmitting portion 22231b, and the concentration of the metal atoms in the light-shielding portion 22232 obtained by reduction of the colorant can refer to the aforementioned, and will not be described here. In other examples, the light-transmitting portion 22231 can not include the second light-transmitting portion 22231b.

[0162] Specifically, step S20 includes steps S21-S23.

[0163] S21: providing a light-shielding structure 500 on the surface of the portions of the glass 400 other than the first portion 410. The light transmittance of the light-shielding structure 500 is less than or equal to 1% for ultraviolet light and infrared light. Specifically, the light-shielding structure 500 can be a hard mask or an ink structure layer coated on the surface of the glass 400.

[0164] S22: The first portion 410 of the glass 400 is subjected to light irradiation treatment with ultraviolet light or infrared light, so that the metal cations in the colorant in the first portion 410 are reduced to metal atoms, and the metal atoms make the light transmittance of the light shielding portion 22232 less than that of the light transmitting portion 22231. Specifically, the wavelength of the ultraviolet light can be greater than or equal to 300 nm and less than or equal to 350 nm. For example, the wavelength of the ultraviolet light can be 300 nm, 310 nm, 315 nm, 320 nm, 330 nm, 340 nm, 350 nm, etc. The wavelength of the infrared light can be greater than or equal to 0.9 um and less than or equal to 5 um. For example, the wavelength of the infrared light can be 0.9 um, 0.975 um, 1 um, 1.03 um, 1.06 um, 2 um, 2.5 um, 3 um, 3.5 um, 4 um, 4.5 um, 5 um, etc. The time of the light irradiation treatment can be greater than or equal to 10 minutes and less than or equal to 60 minutes according to the energy of the ultraviolet lamp or the infrared lamp. For example, in the case where the energy of the ultraviolet lamp or the infrared lamp is greater than 20 uw / cm2, the time of the light irradiation treatment can be 10 minutes, 20 minutes, 30 minutes, etc., and in the case where the energy of the ultraviolet lamp or the infrared lamp is less than 20 uw / cm2, the time of the light irradiation treatment can be 40 minutes, 50 minutes, 60 minutes, etc. In this way, in the wavelength range of the ultraviolet light or the wavelength range of the infrared light, the energy in the ultraviolet light or the infrared light is more easily absorbed by the Ce3+ in the glass 400 to release free electrons, so that the metal cations in the colorant are reduced to metal atoms.

[0165] S23: The light shielding structure 500 is removed. In the case where the light shielding structure 500 is a mask, the mask is removed. In the case where the light shielding structure 500 is an ink structure layer, the ink structure layer is decomposed and removed at the same time as the heat treatment of the glass 400 described below.

[0166] S30: The glass 400 after the light irradiation treatment is subjected to heat treatment at a first temperature to make the metal atoms gather in a cluster state. At the same time, in the case where the composition of the glass includes Li2O, lithium metasilicate nanocrystal particles are formed in the glass with the metal atoms in a dispersed state and the metal atoms in a cluster state as crystal nuclei. In this way, the metal atoms in a cluster state and the lithium metasilicate nanocrystal particles enhance the absorption of light, which can further reduce the light transmittance of the light shielding portion 22232, and is beneficial to improve the detection accuracy of the physiological information of the user by the electronic device 100.

[0167] Specifically, the first temperature can be greater than or equal to 400°C and less than or equal to 650°C. For example, the first temperature can be 400°C, 430°C, 450°C, 470°C, 500°C, 530°C, 550°C, 570°C, 600°C, 630°C, 650°C, etc. In this way, the metal atoms can be aggregated without deforming the glass. If the heating temperature is less than 400°C, the speed of aggregation of the metal atoms is slow, and the production efficiency is low; if the temperature is greater than 650°C, the glass will be softened and deformed. Based on this, the time of heat treatment can be greater than or equal to 2 hours and less than or equal to 6 hours. For example, the time of heat treatment can be 2 hours, 3 hours, 4 hours, 5 hours, 6 hours, etc., and the higher the first temperature, the shorter the time of heat treatment can be.

[0168] S40: The light-shielding portion 22232 and the light-transmitting portion 22231 are subjected to a chemical strengthening treatment to obtain a cover plate body having an ion exchange layer on the surface (not shown in FIG. 19). Specifically, the glass 400 after the light treatment and the heat treatment is subjected to the chemical strengthening treatment to obtain a cover plate body having an ion exchange layer on the surface. The structure, depth, and effects of the ion exchange layer can be referred to the foregoing, and will not be described here. Specifically, the glass 400 includes Li2O, Na2O, and K2O in the composition, and the step S40 can include steps S41-S42.

[0169] S41: The light-shielding portion 22232 and the light-transmitting portion 22231 are immersed in a first molten salt having a second temperature for a first duration to perform a first ion exchange, and the first molten salt includes at least one of sodium nitrate and potassium nitrate. Specifically, the glass 400 after the light treatment and the heat treatment can be subjected to the first ion exchange.

[0170] In some examples, the first molten salt can be potassium nitrate, and the obtained ion exchange layer can be a potassium ion exchange layer. The radius difference between potassium ions and sodium ions is large, which can make the compressive stress in the ion exchange layer larger, and thus the performance of the back cover can be better. Specifically, the first molten salt can be substantially pure potassium nitrate, for example, the first molten salt can be a molten salt with a concentration of 90% or 95% or 98% or 100% of potassium nitrate. The second temperature can be greater than or equal to 380°C and less than or equal to 500°C, for example, the second temperature can be 380°C, 400°C, 430°C, 450°C, 470°C, 500°C, etc. In this way, the potassium ions can be exchanged with the sodium ions in the glass 400 while the temperature is not too high to cause the lattice in the glass 400 to rearrange and fail to form a compressive stress layer. The first time length can be greater than or equal to 4 hours and less than or equal to 7 hours. The higher the second temperature, the shorter the first time length can be. For example, the first time length can be 4 hours, 4.5 hours, 5 hours, 5.5 hours, 6 hours, 6.5 hours, 7 hours, etc. In this way, the thickness of the ion exchange layer and the concentration of potassium ions in the ion exchange layer can be ensured while the manufacturing efficiency of the back cover 222 is ensured.

[0171] In other examples, the first molten salt can be a mixed molten salt of potassium nitrate and sodium nitrate, and the obtained ion exchange layer can be a potassium ion exchange layer and a sodium ion exchange layer. The concentration of potassium nitrate can be greater than or equal to 40% and less than or equal to 60%. For example, the concentration of potassium nitrate can be 40%, 50%, 60%, etc. The second temperature can be as described above, which will not be repeated here. The first time length can be greater than or equal to 2 hours and less than or equal to 5 hours. For example, the first time length can be 2 hours, 2.5 hours, 3 hours, 3.5 hours, 4 hours, 4.5 hours, 5 hours, etc.

[0172] In yet other examples, the first molten salt can be sodium nitrate, and the obtained ion exchange layer can be a sodium ion exchange layer. The second temperature can be as described above, which will not be repeated here. The first time length can be as described above when the first molten salt is potassium nitrate, which will not be repeated here.

[0173] S42: The light shielding part 22232 and the light transmitting part 22231 are placed in a second molten salt with a third temperature for a second time length to perform a second ion exchange, and the second molten salt includes at least one of sodium nitrate and potassium nitrate. Specifically, the glass 400 after the light irradiation treatment and the heat treatment can be subjected to a second ion exchange, and the second time length is less than the first time length. In this way, the thickness of the ion exchange layer formed by the two ion exchanges can be larger, so that the performance of the cover plate body 2223 is better, and thus the reliability of the back cover 222 as a whole is better. In addition, the thickness of the ion exchange layer can be as large as possible while the manufacturing efficiency of the back cover 222 is ensured.

[0174] In some examples, the second molten salt is potassium nitrate, and the third temperature can have the same range as the second temperature. The third temperature can be the same as the second temperature or different from the second temperature, which will not be repeated here. The second time length can be greater than or equal to 1 hour and less than or equal to 3 hours, for example, the second time length can be 1 hour, 1.5 hours, 2 hours, 2.5 hours, 3 hours, etc.

[0175] In other examples, the second molten salt can also be sodium nitrate or a mixed molten salt of sodium nitrate and potassium nitrate. In other embodiments, step S40 can also not include step S42, and in step S41, the first molten salt is a mixed molten salt of potassium nitrate and sodium nitrate with a potassium nitrate concentration greater than 90%, and the first time length is 4-7 hours. In other embodiments, the method for manufacturing the back cover 222 can also not include step S40, in which case the cover plate body 2223 is formed in step S30.

[0176] It should be noted that before the chemical strengthening treatment of the light-treated glass 400, the glass 400 also needs to be mechanically processed. Specifically, the mechanical processing can include, but is not limited to, cutting, computer numerical control (CNC) machining, rough grinding, fine grinding, edge grinding, polishing, etc. In the case of a 3D back cover 222, the mechanical processing can also include hot bending forming, etc. It can be understood that the mechanical processing can be performed after step S30 or before step S20, i.e., in step S10.

[0177] S50: Forming a first electrode 2224 and a second electrode 2225 on the surface of the light-shielding portion 22232 to obtain the back cover 222. The first electrode 2224 and the second electrode 2225 are spaced apart, and part of the surface of the first electrode 2224 and part of the surface of the second electrode 2225 form part of the area of one surface of the back cover 222. Specifically, a chromium carbide or chromium nitride material can be formed on the surface of the cover plate body 2223 by magnetron sputtering to form an electrode layer, and then the electrode layer can be laser engraved to form the first electrode 2224 and the second electrode 2225. The structure of the first electrode 2224 and the second electrode 2225 can refer to the foregoing, which will not be repeated here. In other embodiments, the method for manufacturing the back cover can also not include step S50.

[0178] S60: An ink layer 2226 is formed on the surface of the light shielding portion 22232 to obtain a cover plate, at least a portion of the ink layer 2226 forms an edge region of one surface of the cover plate and is arranged around the first light transmitting portion 22231a. Specifically, the ink layer 2226 can be formed by screen printing or transfer printing, and the specific structure of the ink layer 2226 can be referred to the foregoing, which will not be described here. It should be noted that, in the case where the cover plate has the first electrode 2224 and the second electrode 2225, the ink layer 2226 covers the first electrode 2224 and the second electrode 2225. The specific structure of the ink layer 2226 can be referred to the foregoing, which will not be described here. In some other embodiments, the manufacturing method of the back cover 222 can also not include the ink layer 2226.

[0179] When the cover plate is the light transmitting cover plate 211, the manufacturing method of the light transmitting cover plate 211 can refer to the manufacturing method of the back cover 222 described above, which will not be described here.

[0180] In order to better illustrate the technical solutions of the present application, please refer to Tables 1-4, which show the components and mass fractions of the glass forming the cover plate body of Embodiments 1-12 of the present application, and also show the number of times of chemical strengthening treatment of the glass, the components, concentration, heating temperature and heating time of the molten salt used, and the optical parameters of the obtained cover plate body and the performance parameters of the electronic device. Among them, the performance parameters include the ball drop height, light leakage and PI value (PI value is obtained by the value of the foregoing AC at the value of DC in the static scene). Among them, the comparative example in Table 1 is the optical parameters of the cover plate body formed by the strengthened light transmitting glass with the same shape as the present application in the related art, and the performance parameters of the electronic device including printing ink on the light transmitting cover plate body to form a back cover. It should be noted that, in Embodiments 1-12, the wavelength of the ultraviolet light used for light treatment is 315 nm, the light treatment time is 35 minutes, the heat treatment time after light treatment is 2 hours, and the diameter of the formed cover plate body is about 20 mm and the thickness is about 1 mm.

[0181] Among the performance parameters of the electronic device, the ball drop height refers to the ball drop height of the back cover, and the ball drop height test can refer to the national standard GB / T 39814-2021 (ultra-thin glass impact strength test method). The back cover is formed by the above-mentioned process path, a steel ball with a diameter of 32 mm and a weight of 130 g is dropped from a specified height to the center point of the back cover sample, and the maximum ball test height that the sample can withstand without breaking.

[0182] In the performance parameters of the electronic device, the test of the light leakage performance is to place the smart watch assembled with the back cover provided in the embodiments of the present application in a dark room for testing, and the test can be performed through the following process: (a) make the smart watch work, set the driving current of the light emitting device to be a preset current, for example, set the current of the LED to be 200MA; (b) make the light emitting component and the light detection hole of the light detector face upward, start the data acquisition program to collect the PPG signal; (c) collect data for 1 minute, and record the PPG signal as the light leakage amount. The smaller the light leakage amount is, the better the light blocking performance of the back cover is.

[0183] In the performance parameters of the electronic device, the PI value can be tested through the following process: (a) select 10 healthy young testers, and the test position has no obvious scar; (b) wear the smart watch on the left and right wrists of different testers respectively, and the wearing method is normal and tight; (c) guide the testers to sit still, and place the wrist on the desktop, the position is level with the heart position, and keep the testers in a resting state during the test; (d) adjust the configuration test program to collect and store the PPG signals of infrared light, red light and green light, and the single test time can be 90 seconds, and the total test time is greater than or equal to 6000 seconds; (e) calculate the PI value. The greater the PI value is, the higher the accuracy of the smart watch in detecting the physiological information of the human body is, and the better the light shielding performance of the non-light transmission area of the back cover is.

[0184] Table 1

[0185] Table 2

[0186] Table 3

[0187] Table 4

[0188] As can be seen from the embodiments 1-12, the back cover provided in the present application can effectively reduce the light transmission rate of the light shielding part of the back cover, thereby effectively reducing the light leakage amount reflected from the back cover to the light detector. Compared with the related art, the light leakage amount can be reduced to at least 69% of the light leakage amount of the back cover in the related art, and can be reduced to at most 14.7% of the light leakage amount of the back cover in the related art. The PI value of the electronic device can be increased to at least 118% of the PI value of the electronic device in the related art, and can be increased to at most 139% of the PI value of the electronic device in the related art. Therefore, the glass and the back cover made of the glass provided in the present application effectively improve the light shielding performance of the non-light transmission part, thereby effectively improving the detection accuracy of the physiological information of the user by the electronic device.

[0189] In the description of the specification, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0190] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A glass characterized by, The glass comprises SiO2, Al2O3, Ce2O3, alkali metal oxide and colorant, the colorant comprises at least one of Ag2O and Au2O, the Ce2O3 is used to reduce metal cations in the colorant into metal atoms under light treatment of ultraviolet light or infrared light, the metal atoms are used to make the light transmittance of the glass less than the light transmittance before the light treatment.

2. The glass according to claim 1, wherein, The mass fraction of the colorant is greater than or equal to 0.0001% and less than or equal to 0.5%, and the mass fraction of the Ce2O3 is greater than or equal to 0.0001% and less than or equal to 0.3%.

3. The glass according to claim 1 or 2, characterized in that, The components of the glass further comprise: at least one of Sb2O3, SnO and Bi2O3.

4. The glass according to claim 3, wherein, The sum of the mass fraction of the Sb2O3, the mass fraction of the SnO and the mass fraction of the Bi2O3 is greater than or equal to 0.0001% and less than or equal to 1%.

5. The glass of any one of claims 1-4, wherein, Each component of the glass is uniformly distributed in the glass.

6. The glass according to any one of claims 1-5, wherein, The light transmittance of the glass is greater than or equal to 80% for light with a wavelength of 400-1000 nm.

7. A cover plate characterized by The cover plate comprises a cover plate body formed by the glass according to any one of claims 1-6, the cover plate body comprising: a light-transmitting portion, the components of the light-transmitting portion being the same as the components of the glass; a light-blocking portion, the light-blocking portion being connected to the light-transmitting portion, the components of the light-blocking portion comprising the metal atoms, and the light transmittance of the light-blocking portion being less than the light transmittance of the light-transmitting portion.

8. The cover plate according to claim 7, wherein, The ratio of the number of the metal atoms in the light-blocking portion to the sum of the number of the metal atoms and the number of the metal cations in the light-blocking portion is greater than or equal to 50%.

9. The cover plate according to claim 7 or 8, wherein, The light transmittance of the light-blocking portion is less than or equal to 10% for light with a wavelength of 400-1000 nm.

10. The cover plate according to any one of claims 7-9, wherein, The light-transmitting portion comprises a first light-transmitting portion and a second light-transmitting portion, the second light-transmitting portion being spaced apart from the first light-transmitting portion; at least a portion of the light-blocking portion is connected between the first light-transmitting portion and the second light-transmitting portion, and the light-blocking portion is integrally formed with the first light-transmitting portion and the second light-transmitting portion.

11. The cover sheet according to any one of claims 7-10, characterized in that The cover plate body comprises: a first main body portion, a portion of the first main body portion forming a portion of the light-blocking portion, and another portion of the first main body portion forming a portion of the light-transmitting portion; an ion-exchange layer formed on the surface of the first main body portion, a portion of the ion-exchange layer forming another portion of the light-blocking portion, and another portion of the ion-exchange layer forming another portion of the light-transmitting portion.

12. The cover plate according to claim 11, wherein, The ion exchange layer has a thickness greater than or equal to 0.01t and less than or equal to 0.22t, wherein t is the thickness of the cover plate body.

13. The cover plate according to any one of claims 7-12, wherein, the cover plate has a first surface and a second surface arranged along a thickness direction; the cover plate further comprises an ink layer, at least a portion of the ink layer is arranged at an edge region of one surface of the cover plate body and around the light-transmitting portion, and the ink layer forms a partial region of the first surface.

14. The cover plate according to any one of claims 7-13, wherein, the cover plate has a first surface and a second surface arranged along a thickness direction; the cover plate further comprises: a first electrode arranged on the cover plate body, a partial surface of the first electrode forms a partial region of the second surface; a second electrode arranged on the cover plate body and spaced apart from the first electrode, a partial surface of the second electrode forms a partial region of the second surface.

15. The cover plate according to any one of claims 7-14, wherein, the cover plate has a first surface and a second surface arranged along a thickness direction; the first surface and the second surface are both planar; or, the second surface gradually protrudes in a direction away from the first surface along an outer edge to a central region; and / or, the first surface gradually recesses in a direction close to the second surface along an outer edge to a central region.

16. An electronic device, comprising: comprising: a cover plate according to any one of claims 7-15, the cover plate has a first surface and a second surface arranged along a thickness direction; a housing arranged around the cover plate and connected with the cover plate, the housing and the cover plate enclose a containing space, the first surface forms a partial inner wall of the containing space; a light-emitting device arranged in the containing space, an emitting surface of the light-emitting device faces the light-transmitting portion, and the light-blocking portion is located at a periphery of the light-transmitting portion.

17. The electronic device according to claim 16, wherein, the electronic device further comprises a light-receiving component; the light-transmitting portion comprises a first light-transmitting portion and a second light-transmitting portion arranged spaced apart from each other, at least a portion of the light-blocking portion is connected between the first light-transmitting portion and the second light-transmitting portion and is integrally formed with the first light-transmitting portion and the second light-transmitting portion; an emitting surface of the light-emitting device faces the first light-transmitting portion; and an incident surface of the light-receiving component faces the second light-transmitting portion.

18. An electronic device, comprising: comprising: a cover plate according to any one of claims 7-15, the cover plate has a first surface and a second surface arranged along a thickness direction; a housing arranged around the cover plate and connected with the cover plate, the housing and the cover plate enclose a containing space, the first surface forms a partial inner wall of the containing space; a light-receiving component arranged in the containing space, an incident surface of the light-receiving component faces the light-transmitting portion, and the light-blocking portion is located at a periphery of the light-transmitting portion.

19. A method of making glass, comprising: The method comprises: mixing and melting raw materials for preparing glass to obtain a glass liquid; cooling and shaping the glass liquid to obtain a glass substrate; annealing the glass substrate to obtain a glass. The composition of the glass comprises SiO2, Al2O3, Ce2O3, alkali metal oxide and colorant, and the colorant comprises at least one of Ag2O and Au2O.

20. A method of making a cover plate, comprising: The method comprises: providing a glass, the glass being the glass according to any one of claims 1-6; irradiating a first part of the glass with ultraviolet light or infrared light to form a light-shielding part in the first part, and a light-transmitting part in the part of the glass other than the first part; wherein the light transmittance of the light-shielding part is less than that of the light-transmitting part.

21. The method of claim 20, wherein the light-transmitting part comprises a first light-transmitting part and a second light-transmitting part, and at least a part of the light-shielding part is connected between the first light-transmitting part and the second light-transmitting part.

22. The method of claim 20 or 21, wherein irradiating a first part of the glass with ultraviolet light or infrared light to form a light-shielding part in the first part, and a light-transmitting part in the part of the glass other than the first part comprises: providing a light-shielding structure on the surface of the part of the glass other than the first part; irradiating the first part with ultraviolet light or infrared light to reduce metal cations in the colorant in the first part to metal atoms; removing the light-shielding structure.

23. The method of claim 22, wherein the wavelength of the ultraviolet light is greater than or equal to 300 nm and less than or equal to 350 nm.

24. The method of any one of claims 20-23, wherein after irradiating a first part of the glass with ultraviolet light or infrared light to form a light-shielding part in the first part, and a light-transmitting part in the part of the glass other than the first part, the method further comprises: heating the light-shielding part at a first temperature to cause the metal atoms to aggregate in a cluster state.

25. The method of claim 24, wherein the first temperature is greater than or equal to 400°C and less than or equal to 650°C.

26. The method of any one of claims 20-25, wherein after irradiating a first part of the glass with ultraviolet light or infrared light to form a light-shielding part in the first part, and a light-transmitting part in the part of the glass other than the first part, the method further comprises: chemically strengthening the light-shielding part and the light-transmitting part to obtain a cover body having an ion exchange layer on the surface.

27. The method of claim 26, wherein the alkali metal compound comprises Li2O, Na2O and K2O; chemically strengthening the light-shielding part and the light-transmitting part to obtain a cover body having an ion exchange layer on the surface comprises: immersing the light-shielding part and the light-transmitting part in a first molten salt at a second temperature for a first duration to perform a first ion exchange, the first molten salt including at least one of sodium nitrate and potassium nitrate.

28. The method of claim 27, wherein, chemically strengthening the light-shielding part and the light-transmitting part to obtain a cover plate body with a surface having an ion exchange layer further comprises: immersing the light-shielding part and the light-transmitting part in a second molten salt at a third temperature for a second duration to perform a second ion exchange, the second molten salt including at least one of sodium nitrate and potassium nitrate, the second duration being less than the first duration.

29. The method of any one of claims 20-28, wherein, illuminating a first portion of the glass to form a light-shielding part, the first portion of the glass being other than the light-transmitting part, the method further comprising: forming a first electrode and a second electrode on a surface of the light-shielding part to obtain a cover plate, wherein the first electrode and the second electrode are spaced apart, and a portion of a surface of the first electrode and a portion of a surface of the second electrode form a portion of an area of one surface of the cover plate.

30. The method of any one of claims 20-29, wherein, illuminating a first portion of the glass to form a light-shielding part, the first portion of the glass being other than the light-transmitting part, the method further comprising: forming an ink layer on a surface of the light-shielding part to obtain a cover plate, at least a portion of the ink layer forming an edge area of one surface of the cover plate and being disposed around the light-transmitting part.

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