Optical glass cover plate and preparation method thereof, and wearable device

Abstract

The present invention discloses an optical glass cover plate and a preparation method thereof, and a wearable device. The optical glass cover plate comprises at least one glass cover plate, and the glass cover plate is provided with at least one annular light-shielding area to form a light-transmitting area in the light-shielding area; wherein the light-shielding area is black, and the axial direction of the light-shielding area is parallel to the thickness direction of the glass cover plate and the light-shielding area runs through the thickness direction of the glass cover plate.

Description

Technical Field

[0001] The present application relates to the technical field of electronic equipment, and in particular to an optical glass cover plate and a preparation method thereof, and a wearable device. Background Art

[0002] Smart wearable devices generally have the function of monitoring human physiological conditions such as heart rate, blood oxygen, electrocardiogram and sleep quality. In order to achieve this function, a large number of sensor optical channels are generally added to the back cover of the wearable device to detect the human physiological condition.

[0003] Compared with metal and ceramic, glass has always attracted much attention as a new cover material. Glass is more fashionable, has less interference with the signal collection of smart wearable sensors, and has high resolution, high contrast and transmittance to meet the anti-crosstalk characteristics, and can be applied to the field of smart wearable device technology. Since a large number of optical channels of sensors need to be set on the cover material, it is necessary to have both light-absorbing glass materials and high-transmittance glass materials on the cover. Currently, the most widely used method is to use screen printing to prepare a black annular light-isolating area, so that the light-isolating area is transparent inside, and the light-isolating area isolates adjacent light-transmitting areas to prevent crosstalk.

[0004] However, screen printing can only form black circles of ink on the surface of the glass cover. The transmittance of the ink increases with the length of use, resulting in a decrease in the effective light yield, which cannot meet the requirements for preventing crosstalk. Summary of the invention

[0005] Embodiments of the present invention provide an optical glass cover plate, a preparation method thereof, and a wearable device.

[0006] In order to solve the above technical problems, the embodiments of the present application provide the following technical solutions:

[0007] The first aspect of the present application provides an optical glass cover plate, which comprises

[0008] At least one glass cover plate, wherein at least one annular light-shielding area is provided on the glass cover plate to form a light-transmitting area within the light-shielding area;

[0009] The shading area is black, the axial direction of the shading area is parallel to the thickness direction of the glass cover plate, and the shading area runs through the thickness direction of the glass cover plate.

[0010] In some modified implementations of the first aspect of the present application, in the aforementioned optical glass cover plate, at least an outer side wall of the light-shielding area away from the light-transmitting area is non-linear in the thickness direction of the glass cover plate.

[0011] In some modified implementations of the first aspect of the present application, in the aforementioned optical glass cover plate, at least an outer side wall of the light-shielding area away from the light-transmitting area is wavy in the thickness direction of the glass cover plate.

[0012] In some modified implementations of the first aspect of the present application, the aforementioned optical glass cover plate, wherein the number of the glass cover plates is two;

[0013] The two glass cover plates are stacked, and the shading areas on the two glass cover plates completely overlap.

[0014] In some modified implementations of the first aspect of the present application, in the aforementioned optical glass cover plate, the number of shading areas on the glass cover plate is two, and the two shading areas are arranged at intervals.

[0015] In some modified implementations of the first aspect of the present application, in the aforementioned optical glass cover plate, the annular width of the shading area along the plate surface parallel to the glass cover plate is 0.2 mm-1 mm;

[0016] The light-shielding area and the light-transmitting area are integrally formed.

[0017] The second aspect of the present application provides a method for preparing the aforementioned optical glass cover plate, which comprises the following steps:

[0018] obtaining a metal-doped glass plate;

[0019] Covering and protecting designated areas on the front and back surfaces of the glass plate so that the unprotected areas form opposite and exposed first and second annular areas, and the first and second annular areas completely overlap along the thickness direction of the glass plate;

[0020] The atmosphere restores the protected glass sheet;

[0021] The reduced glass plate is processed for the second time to form a black light-shielding area corresponding to the first annular area and the second annular area, thereby obtaining a glass cover plate blank.

[0022] In some modified implementations of the second aspect of the present application, in the aforementioned method for preparing the optical glass cover plate, the thickness of the glass cover plate between the first annular region and the second annular region is less than or equal to the depth of atmosphere reduction.

[0023] In some modified implementations of the second aspect of the present application, the aforementioned method for preparing the optical glass cover plate,

[0024] The step of secondary processing the reduced glass plate to form a black light-shielding area corresponding to the first annular area and the second annular area to obtain a glass cover plate blank sheet further includes:

[0025] Laminating at least two of the glass cover blanks, keeping the shading areas on the at least two of the glass cover blanks completely overlapped, to obtain an optical glass cover; and / or

[0026] The glass cover plate blank is shaped and chemically strengthened to obtain an optical glass cover plate.

[0027] A third aspect of the present application provides a wearable device, comprising

[0028] A device body, the device body being used to be worn at a wearing position on a human body;

[0029] The aforementioned optical glass cover plate is arranged on the device body.

[0030] Compared with the prior art, the optical glass cover provided in the first aspect of the present application, by setting the shading area to penetrate the thickness direction of the glass cover, the black shading area does not float on the surface of the glass cover, thereby increasing the light absorption area, greatly improving the light absorption effect, and avoiding the problem of failure with time of use, effectively solving the crosstalk problem, and improving the signal-to-noise ratio of the optical signal; thereby solving the problem that the shading circle on the existing optical glass cover is only formed by ink on the surface, and the transmittance of the ink increases with the increase of use time, resulting in a decrease in the effective light yield and failure to meet the requirements for preventing crosstalk. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] By reading the detailed description below with reference to the accompanying drawings, the above and other purposes, features and advantages of the exemplary embodiments of the present application will become easy to understand. In the accompanying drawings, several embodiments of the present application are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0032] Figure 1 The first structural diagram of the optical glass cover provided in this embodiment is schematically shown;

[0033] Figure 2 The second structural diagram of the optical glass cover provided in this embodiment is schematically shown;

[0034] Figure 3 A third structural schematic diagram of the optical glass cover provided in this embodiment is schematically shown;

[0035] Figure 4 A first cross-sectional schematic diagram of the optical glass cover provided in this embodiment is schematically shown;

[0036] Figure 5 A second cross-sectional schematic diagram of the optical glass cover provided in this embodiment is schematically shown;

[0037] Figure 6 A third cross-sectional schematic diagram of the optical glass cover provided in this embodiment is schematically shown;

[0038] Figure 7 A fourth cross-sectional schematic diagram of the optical glass cover provided in this embodiment is schematically shown;

[0039] Figure 8 A schematic diagram schematically shows a process flow of a method for preparing an optical glass cover plate provided in this embodiment;

[0040] Fig. 9 A second process diagram of the method for preparing the optical glass cover provided in this embodiment is schematically shown;

[0041] Explanation of the accompanying figures: 1. Glass cover; 2. Light-shielding area; 3. Light-transmitting area. DETAILED DESCRIPTION

[0042] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0043] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by technicians in the field to which this application belongs.

[0044] The technical solution of the embodiment of the present invention is to solve the above technical problems, and the overall idea is as follows:

[0045] Example 1

[0046] Reference Figure 1 The optical glass cover provided by the embodiment of the present application comprises at least one glass cover 1, on which at least one annular light-shielding area 2 is provided to form a light-transmitting area 3 in the light-shielding area 2; wherein the light-shielding area 2 is black, the axial direction of the light-shielding area 2 is parallel to the thickness direction of the glass cover 1, and the light-shielding area 2 runs through the thickness direction of the glass cover 1.

[0047] Specifically, in order to solve the problem that the shading ring on the existing optical glass cover is only formed by ink on the surface, the transmittance of the ink increases with the increase of usage time, resulting in a decrease in the effective light yield and failure to meet the requirement of preventing crosstalk, the present embodiment provides an optical glass cover, by setting the shading area 2 to pass through the thickness of the glass cover 1, so that the interior of the glass cover 2 also has a black shading area to ensure the light absorption effect and the light isolation effect, which can prevent other stray light in the thickness direction of the glass cover 1 from affecting the light transmitting area 3 and play a role in isolation, and can also effectively ensure the service life of the optical glass cover and prevent the shading area 2 from failing with the increase of usage time.

[0048] Among them, the optical glass cover plate provided in this embodiment is used for photoplethysmography (PPG, PhotoPlethysmo Graphic) in conjunction with smart wearable devices to perform physiological measurements on the skin surface, such as obtaining human physiological conditions such as heart rate, blood oxygen, electrocardiogram, and sleep quality; the optical glass cover plate can be, but is not limited to, set on the back of the smart wearable device to fit the human skin when worn.

[0049] The glass cover plate 1 may be a metal-doped glass cover plate, a conventional glass cover plate, etc., and may be designed and adjusted according to actual needs. The number of glass cover plates 1 may be designed and adjusted according to actual needs, for example, according to the strength and thickness requirements of the type of smart device.

[0050] Among them, the shading area 2 is a black annular structure, which can be but not limited to a circular ring, a rectangular ring, a polygonal ring, a triangular ring, etc., as long as it is a closed annular structure, it is ensured that the area enclosed therein can form a transparent light-transmitting area 3, and the annular width of the shading area 2 can be uniform or non-uniform. In this embodiment, it is preferably uniform to reduce the process difficulty; the light-transmitting area 3 corresponds to the relevant sensors of the smart wearable device to form corresponding optical channels, ensuring that the reflection of light between the relevant sensors and the human skin can be directly and effectively acquired by the sensor; the number of light-transmitting areas 3 can be designed and adjusted according to actual needs, depending on the number of sensors on the smart wearable device and the number of required optical channels. It is not difficult to understand that the number of shading areas 2 and the number of light-transmitting areas 3 are the same and correspond one to one, that is, refer to the attached Figure 2 and attached Figure 3, the arrangement of the shading area 2 also depends on the position arrangement of the light-transmitting area 3. Two or more shading areas 2 can be arranged in a straight line, irregularly, in a matrix, etc. In this embodiment, the shading area 2 and the light-transmitting area 3 can be welded by black opaque glass (other black materials) and transparent glass respectively; the shading area 2 can also form an integrated structure by reducing the metal ions in the glass cover plate 1. In this embodiment, the axial dimension of the shading area 2 runs through the thickness direction of the glass cover plate 1, thereby effectively ensuring the absorption of stray light outside the shading area 3, improving the effective light yield, and completely preventing crosstalk between adjacent light-transmitting areas 3. It has excellent mechanical strength, and the shading area 3 does not float on the surface of the glass cover plate 1, which effectively ensures the service life of the shading area 3.

[0051] According to the above, the optical glass cover provided in the first aspect of the present application, by setting the shading area 2 to penetrate the thickness direction of the glass cover 1, the black shading area 2 does not float on the surface of the glass cover 1, thereby greatly improving the light absorption effect, avoiding the problem of failure with time of use, and effectively solving the crosstalk problem; thereby solving the problem that the shading circle on the existing optical glass cover is only formed by ink on the surface, and the transmittance of the ink increases with the increase of the use time, resulting in a decrease in the effective light yield, and the problem that the requirement for preventing crosstalk cannot be met.

[0052] The term "and / or" in this article is merely a description of the association relationship of associated objects, indicating that three relationships may exist, for example, A and / or B, which is specifically understood as: A and B may be included at the same time, A may exist alone, or B may exist alone, and any of the above three situations may exist.

[0053] Further, see Attachment Figure 4 , Attachment Figure 5 , Attachment Figure 6 And attached Figure 7 In the optical glass cover provided in this embodiment, in a specific implementation, at least the outer side wall of the light-shielding area 2 away from the light-transmitting area 3 is non-linear in the thickness direction of the glass cover 1 .

[0054] Specifically, in order to ensure the light absorption effect of the shading area 2, in this embodiment, at least the outer side wall away from the light-transmitting area 3 is set to be non-linear in the thickness direction of the glass cover plate 1, which can be bent, arc-shaped, multi-segment arc-shaped, tooth-shaped, etc., to increase the light absorption area of ​​the shading area 2 outside the light-transmitting area 3, thereby improving the light absorption effect and preventing crosstalk.

[0055] Further, see Attachment Figure 4 , Attachment Figure 5 , Attachment Figure 6 And attached Figure 7In the optical glass cover provided in this embodiment, in a specific implementation, at least the outer side wall of the light-shielding area 2 away from the light-transmitting area 3 is wavy in the thickness direction of the glass cover 1 .

[0056] Specifically, the outer wall of the light shielding area 2 at least away from the axis thereof is set to be wavy in the thickness direction of the glass cover plate 1, which can ensure that the light absorption area of ​​the light shielding area 2 outside the light transmission area 3 is the largest; of course, it can be understood that the wavy shape can be regular or irregular, preferably regular, to effectively reduce the difficulty of the process. Moreover, the wavy shape can be formed in the thickness direction of a single glass cover plate 1, or can be formed in the thickness direction after two or more glass cover plates 1 are stacked.

[0057] Further, see Attachment Figure 4 , Attachment Figure 5 , Attachment Figure 6 And attached Figure 7 In the optical glass cover plate provided in this embodiment, in a specific implementation, the number of the glass cover plates 1 is two; the two glass cover plates 1 are stacked, and the shading areas 2 on the two glass cover plates 1 completely overlap.

[0058] Specifically, in order to adapt to different equipment requirements, two or more glass cover plates 1 can be stacked to form an optical glass cover plate with improved thickness and strength, which fully meets the requirements of the drop test and the ball drop test; at the same time, at least two glass cover plates 1 are stacked to form an integral optical glass cover plate, which can also effectively reduce the process difficulty of the integral optical glass cover plate. The two glass cover plates 1 can be bonded together by, but not limited to, optical glue.

[0059] Further, see Attachment Figure 4 , Attachment Figure 5 , Attachment Figure 6 And attached Figure 7 In the optical glass cover provided in this embodiment, in a specific implementation, the number of the shading areas 2 on the glass cover 1 is two, and the two shading areas 2 are arranged at intervals.

[0060] Specifically, when there are multiple optical channels required on the corresponding smart wearable device, multiple shading areas 2 need to be set on the glass cover plate 1, and adjacent shading areas 2 need to be arranged at intervals to ensure that adjacent light-transmitting areas 3 are not only isolated by shading areas 2, but also have transition areas or non-effective areas, that is, areas that do not need to become light-transmitting areas 3, thereby being able to efficiently and stably prevent crosstalk, which is beneficial to the absorption of stray light and improve the signal-to-noise ratio of the optical signal.

[0061] Furthermore, in the optical glass cover provided in this embodiment, in a specific implementation, the annular width of the shading area 2 parallel to the plate surface of the glass cover 1 is 0.2 mm-1 mm; the shading area 2 and the light-transmitting area 3 are integrally formed.

[0062] Specifically, in order to ensure the absorption of stray light and avoid affecting the appearance, the ring width of the shading area 2 is set to 0.2mm-1mm in this embodiment, which can not only ensure the absorption rate of stray light and ensure that there is no crosstalk between adjacent light-transmitting areas 3, but also effectively ensure that the appearance is not obvious, and does not affect the appearance after subsequent assembly on the smart wearable device. It is not difficult to understand that the ring width data provided in this embodiment is mainly for smart wearable devices worn on the wrist, which can be but not limited to smart watches, bracelets, etc.; this data can be designed and adjusted according to actual needs, for example, according to the type, size and wearing position of the smart device. In this embodiment, the shading area 2 can be formed by chemical reduction to ensure the integration of the shading area 2 and the light-transmitting area 3 and even the entire glass cover plate 1, effectively ensure the strength of the optical glass cover plate, and avoid the generation of stress concentration points.

[0063] Example 2

[0064] Further, see Attachment Figure 8 This embodiment provides a method for preparing the optical glass cover plate, which comprises the following steps:

[0065] 101. Obtain a metal-doped glass plate;

[0066] Specifically, a glass plate doped with at least one metal ion selected from Cu, Ni, Fe, Mn, and V is prepared or purchased, and the glass plate contains 0.01 to 30 mol% of metal ions to ensure that the above metals can be used to form a black product as a light-absorbing substance in the light-shielding area 2. It is understood that the metal-doped glass plate is commercially available, blackenable glass, such as the anti-halation glass for optoelectronic equipment of China Building Materials Academy; it can also be a doped glass rod prepared by itself, for example: the glass rod is rounded to a diameter of 20 mm to 50 mm, sliced ​​to a glass disc with a thickness of 1 to 3 mm, and double-sided polished for standby use. The diameter of the glass rod and the slice thickness can be designed and adjusted according to actual needs, and no further elaboration is made here.

[0067] 102. Cover and protect designated areas on the front and back surfaces of the glass plate, so that the unprotected areas form a first annular area (not shown in the figure) and a second annular area (not shown in the figure) opposite to each other, and the first annular area and the second annular area completely overlap along the thickness direction of the glass plate;

[0068] Specifically, the positions of the light shielding area 2 are formed on the front and back sides of the corresponding glass plate, and other positions are covered and protected, for example: Pd, Ti, Al, Cu, Ni are used to form a dense protective film layer by magnetron sputtering to prevent the reducing atmosphere from contacting the positions except the corresponding light shielding area 2; for another example: other shielding and covering methods are used to shield and protect the positions except the corresponding light shielding area 2. At the same time, it is also necessary to ensure that the thickness of the glass plate between the first annular area and the second annular area is less than or equal to the depth of atmosphere reduction, thereby ensuring that the depth of gas diffusion during atmosphere reduction can penetrate the interval between the first annular area and the second annular area, so as to achieve penetration of the light shielding area 2 in the thickness direction of the glass plate.

[0069] 103. Atmosphere restores the protected glass plate;

[0070] Specifically, the covered and protected glass plate is placed in a reduction furnace for reduction in a hydrogen atmosphere. The reducing gas in the process may be, but is not limited to, hydrogen or nitrogen. The pressure is 100-400Kpa, the temperature is 500-700°C, and the reduction time is between 1000-30000min. It can be understood that the reduction depth under this condition is 0.5-2mm. If the reduction depth needs to be adjusted, the above reduction conditions need to be adjusted accordingly. After the reduction in this embodiment is completed, a black structure is formed on the glass plate, which may include metal elements, low-valent metal ions, etc., that is, only the positions corresponding to the first annular area and the second annular area are black, and other covered and protected positions are not black.

[0071] Restoration time / min 1000 15500 30000 500 35000 Transmittance in shading area / % 45.01％ 10.83％ 2.55％ 89.33％ 2.55％

[0072] Referring to the data in the above table, according to product requirements, at a temperature of 600°C, selecting a reduction time within 1000-30000 min can ensure that the transmittance of the shading area 2 is less than 45%, thereby ensuring the light absorption performance of the shading area 2 and the formation of the light channel. If the reduction time is less than 1000 min, the light absorption performance of the shading area 2 cannot be guaranteed, and if the reduction time exceeds 30000 min, unnecessary resources will be wasted.

[0073] Reduction temperature / ℃ 500 600 700 800 400 Light shielding layer transmittance / % 48.06％ 5.21％ 3.27％ / 99.52

[0074] Referring to the data in the above table, according to product requirements, when the reduction time is 20000min, the reduction temperature is selected within the range of 500-700℃, which can ensure that the transmittance of the shading area 2 is lower than 48.06%, and the light absorption performance of the shading area 2 and the formation of the light channel are guaranteed. If the temperature is too low, the light absorption performance of the shading area 2 cannot be guaranteed, and if the temperature is too high at 800℃, it exceeds the softening point of the glass, resulting in deformation of the appearance of the optical glass cover, making it a defective product.

[0075] 104. Perform secondary processing on the reduced glass plate to form a black light-shielding area corresponding to the first annular area and the second annular area to obtain a glass cover plate blank.

[0076] Specifically, the glass plate after the reduction treatment is subjected to secondary appearance shaping, the front and back surfaces of the glass plate are milled, finely carved, and processed until the surface is flat, the black state of the first annular area and the second annular area is retained, the protective film layer on the covered and protected area is removed, and the position except the first annular area and the second annular area is restored to a transparent state, and a glass cover plate blank with a light-transmitting area 3 and a light-shielding area 2 is obtained, which is cleaned after polishing for standby use. In this process, the entire glass plate can be thinned as a whole, as long as the surface of the final glass cover plate blank is guaranteed to be flat.

[0077] Further, see Attachment Figure 8 and attached Fig. 9 The method for preparing the optical glass cover provided in this embodiment may further include the following steps after step 104:

[0078] 105. Laminating at least two of the glass cover blanks, keeping the shading areas 2 on the at least two of the glass cover blanks completely overlapped, to obtain an optical glass cover; and / or

[0079] 106. Shape the glass cover blank and perform chemical strengthening treatment to obtain an optical glass cover.

[0080] Specifically, according to the thickness or strength requirements of the smart wearable device, step 105 can be added, in which two or more glass cover blanks are bonded together using high temperature resistant optical adhesive to ensure strict edge alignment and strict overlap of the shading area 2, and then the optical adhesive is cured to ensure stable bonding between the glass cover blanks. The optical glass cover formed by bonding multiple glass cover blanks has a great advantage in strength and can fully meet the requirements of the drop ball impact and drop test. The number of bonded glass cover blanks can be adjusted according to the strength requirements of different products.

[0081] After step 105, step 106 can be performed to perform 2.5D or 3D shaping processing on the solidified multi-layer glass cover blank to the required external dimensions, and perform chemical strengthening treatment to obtain an optical glass cover. In this process, the strengthening liquid used for chemical strengthening treatment can be any mixed molten liquid of potassium nitrate, sodium nitrate, potassium carbonate, potassium sulfate, and potassium chloride, the strengthening temperature is 350-500°C, and the insulation time is 3-8h. This setting can be easily understood by those skilled in the art and will not be described in detail here.

[0082]

[0083] Referring to the data in the above table, according to product requirements, chemical strengthening operation is carried out in a mixed molten salt with a mass ratio of sodium nitrate to potassium nitrate of 1:4, the operating temperature is 420°C, and the time is selected under a strengthening time of 3-8h. The strengthening treatment can ensure that the optical glass cover plate can pass the 100cm drop ball impact test. If the time is less than 3h, it cannot be guaranteed to meet the requirements of the drop ball impact test. When the strengthening time exceeds 8h, although it can pass the 130cm drop ball impact test, the ion exchange has reached the limit value at this time, which is a waste of resources.

[0084]

[0085]

[0086] Referring to the data in the above table, according to product requirements, chemical strengthening operation is carried out in a mixed molten salt with a mass ratio of sodium nitrate to potassium nitrate of 1:4. The operation time is 4 hours. At a strengthening temperature of 350-500°C, the strengthening treatment can ensure that the glass plate can pass the 100cm falling ball impact test. When the temperature is lower than 350°C, it cannot meet the requirements of the falling ball impact test. When the temperature is higher than 500°C, although it can pass the 130cm falling ball impact test, the ion exchange has reached the limit value at this time, which is a waste of resources.

[0087] Of course, it is understandable that when step 105 is not needed, that is, when a single glass blank can form an optical glass cover plate by itself, step 106 is directly performed after step 4.

[0088] Furthermore, the above-mentioned preparation method based on the optical glass cover plate has at least the following three examples;

[0089] Example 1

[0090] Prepare or purchase a glass plate doped with Cu ions, the glass plate contains 0.01 mol% of metal ions, so as to ensure that the metal can be used to form a black product as a light-absorbing substance in the light-shielding area 2. It is understood that the metal-doped glass plate is commercially available, blackenable glass, such as the anti-halation glass for optoelectronic equipment of China Building Materials Academy; it can also be a doped glass rod prepared by itself, for example: the glass rod is rounded to a diameter of 20 mm, sliced ​​to a glass disc with a thickness of 1 mm, and polished on both sides for use.

[0091] The positions of the shading areas 2 are designed to be formed on the front and back sides of the corresponding glass plates, and other positions are covered and protected. A dense protective film layer is formed by magnetron sputtering using Pd to prevent the reducing atmosphere from contacting the positions except the corresponding shading areas 2; at the same time, it is also necessary to ensure that the thickness of the glass plate between the first annular area and the second annular area is less than or equal to the depth of atmosphere reduction, thereby ensuring that the depth of gas diffusion during atmosphere reduction can penetrate the interval between the first annular area and the second annular area, thereby achieving penetration of the shading area 2 in the thickness direction of the glass plate.

[0092] The covered and protected glass plate is placed in a reduction furnace for reduction in a hydrogen atmosphere, with a pressure of 100Kpa, a temperature of 500°C, and a reduction time of 1000min; it can be understood that the reduction depth under this condition is 0.5mm, and if the reduction depth needs to be adjusted, the above reduction conditions need to be adjusted accordingly. After the reduction in this embodiment is completed, a black structure is formed on the glass plate, which may include metal elements, low-valent metal ions, etc., that is, only the positions corresponding to the first annular area and the second annular area are black, and other covered and protected positions are not black.

[0093] After the reduction treatment, the glass plate is subjected to secondary appearance shaping, and the front and back surfaces of the glass plate are milled, finely carved, and processed until the surface is flat, the black state of the first annular area and the second annular area is retained, and the protective film layer on the covered and protected area is removed, and the position except the first annular area and the second annular area is restored to a transparent state, and a glass cover plate blank with a light-transmitting area 3 and a light-shielding area 2 is obtained, which is cleaned and used for later use after polishing. In this process, the entire glass plate can be thinned as a whole, as long as the surface of the final glass cover plate blank is guaranteed to be flat.

[0094] According to the thickness and strength requirements of the smart wearable device, two or more glass cover blanks are bonded together using high temperature resistant optical adhesive to ensure strict edge alignment and strict overlap of the light shielding area 2, and then the optical adhesive is cured to ensure stable bonding between the glass cover blanks. The optical glass cover formed by bonding multiple glass cover blanks has a great advantage in strength and can fully meet the requirements of the drop ball impact and drop test. The number of bonded glass cover blanks can be adjusted according to the strength requirements of different products.

[0095] The solidified multi-layer glass cover blank is 2.5D or 3D shaped to the desired dimensions, and chemically strengthened to obtain an optical glass cover. In this process, the strengthening liquid used for chemical strengthening can be a potassium carbonate melt, the strengthening temperature is 350°C, and the insulation time is 3 hours. This setting can be easily understood by those skilled in the art and will not be described in detail here.

[0096] Example 2

[0097] Prepare or purchase a glass plate doped with Mn ions, the glass plate contains 15 mol% of metal ions, so as to ensure that the above metal can be used to form a black product as a light-absorbing substance in the light-shielding area 2. It is understood that the metal-doped glass plate is commercially available, blackenable glass, such as the anti-halation glass for optoelectronic equipment of China Building Materials Academy; it can also be a doped glass rod prepared by itself, for example: the glass rod is rounded to a diameter of 35 mm, sliced ​​to a glass disc with a thickness of 2 mm, and double-sided polished for use.

[0098] The positions of the shading areas 2 are designed to be formed on the front and back sides of the corresponding glass plates, and other positions are covered and protected. A dense protective film layer is formed by magnetron sputtering using Al to prevent the reducing atmosphere from contacting the positions except the corresponding shading areas 2; at the same time, it is also necessary to ensure that the thickness of the glass plate between the first annular area and the second annular area is less than or equal to the depth of atmosphere reduction, thereby ensuring that the depth of gas diffusion during atmosphere reduction can penetrate the interval between the first annular area and the second annular area, thereby achieving penetration of the shading area 2 in the thickness direction of the glass plate.

[0099] The covered and protected glass plate is placed in a reduction furnace for reduction in a hydrogen atmosphere, with a pressure of 250Kpa, a temperature of 600°C, and a reduction time of 5500min; it can be understood that the reduction depth under this condition is 1.25mm, and the reduction depth needs to be adjusted, that is, the above reduction conditions need to be adjusted accordingly. After the reduction in this embodiment is completed, a black structure is formed on the glass plate, which may include metal elements, low-valent metal ions, etc., that is, only the positions corresponding to the first annular area and the second annular area are black, and other covered and protected positions are not black.

[0100] After the reduction treatment, the glass plate is subjected to secondary appearance shaping, and the front and back surfaces of the glass plate are milled, finely carved, and processed until the surface is flat, the black state of the first annular area and the second annular area is retained, and the protective film layer on the covered and protected area is removed, and the position except the first annular area and the second annular area is restored to a transparent state, and a glass cover plate blank with a light-transmitting area 3 and a light-shielding area 2 is obtained, which is cleaned and used for later use after polishing. In this process, the entire glass plate can be thinned as a whole, as long as the surface of the final glass cover plate blank is guaranteed to be flat.

[0101] According to the thickness and strength requirements of the smart wearable device, two or more glass cover blanks are bonded together using high temperature resistant optical adhesive to ensure strict edge alignment and strict overlap of the light shielding area 2, and then the optical adhesive is cured to ensure stable bonding between the glass cover blanks. The optical glass cover formed by bonding multiple glass cover blanks has a great advantage in strength and can fully meet the requirements of the drop ball impact and drop test. The number of bonded glass cover blanks can be adjusted according to the strength requirements of different products.

[0102] The solidified multi-layer glass cover blank is 2.5D or 3D shaped to the desired dimensions, and chemically strengthened to obtain an optical glass cover. In this process, the strengthening liquid used for chemical strengthening can be a potassium nitrate melt, the strengthening temperature is 425°C, and the insulation time is 5.5 hours. This setting can be easily understood by those skilled in the art and will not be described in detail here.

[0103] Example 3

[0104] Prepare or purchase a glass plate doped with Fe and Mn ions, the glass plate contains 30 mol% of metal ions, so as to ensure that the above metals can be used to form a black product as a light-absorbing substance in the light-shielding area 2. It is understood that the metal-doped glass plate is commercially available, blackenable glass, such as the anti-halation glass for optoelectronic equipment of China Building Materials Academy; it can also be a doped glass rod prepared by itself, for example: the glass rod is rounded to a diameter of 50 mm, sliced ​​to a glass disc with a thickness of 3 mm, and polished on both sides for use.

[0105] The positions of the shading areas 2 are designed to be formed on the front and back sides of the corresponding glass plates, and other positions are covered and protected. A dense protective film layer is formed by magnetron sputtering using Cu to prevent the reducing atmosphere from contacting the positions except the corresponding shading areas 2; at the same time, it is also necessary to ensure that the thickness of the glass plate between the first annular area and the second annular area is less than or equal to the depth of atmosphere reduction, thereby ensuring that the depth of gas diffusion during atmosphere reduction can penetrate the interval between the first annular area and the second annular area, thereby achieving penetration of the shading area 2 in the thickness direction of the glass plate.

[0106] The covered and protected glass plate is placed in a reduction furnace for reduction in a nitrogen atmosphere, with a pressure of 400Kpa, a temperature of 700°C, and a reduction time of 30000min; it can be understood that the reduction depth under this condition is 2mm, and if the reduction depth needs to be adjusted, the above reduction conditions need to be adjusted accordingly. After the reduction in this embodiment is completed, a black structure is formed on the glass plate, which may include metal elements, low-valent metal ions, etc., that is, only the positions corresponding to the first annular area and the second annular area are black, and other covered and protected positions are not black.

[0107] After the reduction treatment, the glass plate is subjected to secondary appearance shaping, and the front and back surfaces of the glass plate are milled, finely carved, and processed until the surface is flat, the black state of the first annular area and the second annular area is retained, and the protective film layer on the covered and protected area is removed, and the position except the first annular area and the second annular area is restored to a transparent state, and a glass cover plate blank with a light-transmitting area 3 and a light-shielding area 2 is obtained, which is cleaned and used for later use after polishing. In this process, the entire glass plate can be thinned as a whole, as long as the surface of the final glass cover plate blank is guaranteed to be flat.

[0108] According to the thickness and strength requirements of the smart wearable device, two or more glass cover blanks are bonded together using high temperature resistant optical adhesive to ensure strict edge alignment and strict overlap of the light shielding area 2, and then the optical adhesive is cured to ensure stable bonding between the glass cover blanks. The optical glass cover formed by bonding multiple glass cover blanks has a great advantage in strength and can fully meet the requirements of the drop ball impact and drop test. The number of bonded glass cover blanks can be adjusted according to the strength requirements of different products.

[0109] The solidified multi-layer glass cover blank is 2.5D or 3D shaped to the desired dimensions, and then chemically strengthened to obtain an optical glass cover. In this process, the strengthening liquid used for chemical strengthening can be a mixed molten solution of potassium nitrate and sodium nitrate, the strengthening temperature is 500°C, and the insulation time is 8 hours. This setting can be easily understood by those skilled in the art and will not be described in detail here.

[0110] Example 3

[0111] This embodiment provides a wearable device, which includes a device body (not shown in the figure) and the optical glass cover plate, wherein the device body is used to be worn at a wearing position on a human body; and the optical glass cover plate is arranged on the device body.

[0112] Specifically, the optical glass cover plate described in this embodiment is the optical glass cover plate described in Embodiment 1. Please refer to the specific description of Embodiment 1 for its structure and working principle, and no further details will be given here.

[0113] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. An optical glass cover plate, characterized in that: include: At least two glass cover plates, the glass cover plates are metal-doped glass plates, and at least one annular light-shielding area is provided on the glass cover plates to form a light-transmitting area within the light-shielding area; at least two of the glass cover plates are stacked, and the light-shielding areas on at least two of the glass cover plates completely overlap; The shading area is black, and a black product formed by metal doped in the glass cover plate is used as a light-absorbing substance in the shading area; the axial direction of the shading area is parallel to the thickness direction of the glass cover plate, and the shading area runs through the thickness direction of the glass cover plate; At least the outer side wall of the light-shielding area away from the light-transmitting area is non-linear in the thickness direction of the glass cover plate, so as to increase the light absorption area of ​​the light-shielding area outside the light-transmitting area; The annular width of the shading area along the plate surface parallel to the glass cover plate is 0.2 mm-1 mm.

2. The optical glass cover according to claim 1, characterized in that: At least an outer side wall of the light-shielding area away from the light-transmitting area is wavy in the thickness direction of the glass cover plate.

3. The optical glass cover plate according to claim 1, characterized in that: There are two shading areas on the glass cover plate, and the two shading areas are arranged at intervals.

4. The optical glass cover plate according to claim 1, characterized in that: The light-shielding area and the light-transmitting area are integrally formed.

5. A method for preparing an optical glass cover plate according to any one of claims 1 to 4, characterized in that: It includes the following steps: obtaining a metal-doped glass plate; Covering and protecting designated areas on the front and back surfaces of the glass plate so that the unprotected areas form opposite and exposed first and second annular areas, and the first and second annular areas completely overlap along the thickness direction of the glass plate; Atmospheric reduction of the protected glass plate under the conditions of a pressure of 100-400Kpa, a temperature of 500-700°C, and a reduction time of 1000-30000min; The reduced glass plate is processed for the second time to form a black light-shielding area corresponding to the first annular area and the second annular area, thereby obtaining a glass cover plate blank.

6. The method for preparing an optical glass cover plate according to claim 5, characterized in that: The thickness of the glass cover plate between the first annular area and the second annular area is less than or equal to the depth of atmosphere reduction.

7. The method for preparing an optical glass cover plate according to claim 5, characterized in that: The step of secondary processing the reduced glass plate to form a black light-shielding area corresponding to the first annular area and the second annular area to obtain a glass cover plate blank sheet further includes: Laminating at least two of the glass cover blanks, keeping the shading areas on the at least two of the glass cover blanks completely overlapped, to obtain an optical glass cover; and / or The glass cover plate blank is shaped and chemically strengthened to obtain an optical glass cover plate.

8. A wearable device, characterized in that: It includes: A device body, the device body being used to be worn on a human body; The optical glass cover plate according to any one of claims 1 to 4, wherein the optical glass cover plate is arranged on the device body.

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