Vehicle glass with barcode and preparation process thereof

Abstract

The present invention provides a vehicle glass with a barcode and a preparation process thereof, wherein the vehicle glass comprises a first glass, a second glass and an intermediate film arranged between the first glass and the second glass, wherein the first glass has a first surface facing the outside of the vehicle and a second surface adhered to the intermediate film; the second glass has a third surface adhered to the intermediate film and a fourth surface facing the inside of the vehicle; and characterized in that a shielding layer is arranged on the second surface and / or the fourth surface, and a barcode formed by laser etching is arranged at a position corresponding to the shielding layer on the second surface and / or the fourth surface, and the barcode includes unique information of the glass and / or the vehicle.

Description

Technical Field

[0001] The invention relates to the field of vehicle glass, and in particular to vehicle glass with a barcode and a preparation process thereof. Background Art

[0002] Making a QR code on the car windshield plays a role in product traceability and anti-counterfeiting. It is required that the QR code of each piece of glass is unique, and the pattern shape and clarity will not change during the life cycle of the glass, and it will always be identifiable. At present, the process methods for making QR codes on car glass mainly include: transfer, inkjet, labeling, screen printing, etc. Among them, the transfer process mainly uses a laser beam to melt the components on the tape on the glass surface, and then tear off the tape after forming a QR code pattern. The inkjet process mainly uses an electronic nozzle to spray sinterable ink on the glass surface. The labeling method uses a printer to print the QR code on the sticker, and then paste it on the outer surface of the glass, or paste it on the inner surface of the front laminated glass. The screen printing method is to print the QR code on the glass. Summary of the invention

[0003] At present, the process of making QR codes on automobile glass still has the following defects. For example, in the transfer process, residual glue needs to be removed after printing; the pattern has color difference; coating and dark glass will affect the printing effect; consumables such as tape are required, and steps such as tearing off the tape are required for automation. The inkjet coding process is divided into ordinary ink jet coding and sinterable ink jet coding. Among them, the ordinary ink jet coding is easily destroyed by organic solvents; the sinterable ink needs to be sintered after coding to keep the pattern permanent, and this ink is different from the general ink in the automobile glass production process. It is specially customized and expensive, and its component particle size is small, otherwise it is very easy to clog the nozzle; the layout on the automobile glass production line requires each pre-treatment printing line to be equipped with this equipment, which requires large investment and inflexible use. In order to prevent the QR code from being torn off or falling off manually in the later stage, the front windshield laminated glass is generally labeled between the two laminated glasses before the assembly process. However, the labels need to be printed in advance, which may cause loss. Although the labeling process in the automotive glass assembly room is fast, it is difficult to ensure the consistency of the manual labeling position, which affects the appearance and is difficult to achieve automation. At present, the industry has printed the QR code on the front windshield automotive glass while printing the trademark (Logo). The method is screen printing, but only different QR codes can be produced for the same product in batches (the screen pattern is fixed and cannot be changed for each piece of glass), and different QR codes cannot be produced for each piece of glass.

[0004] The purpose of the present invention is to solve the problems or shortcomings of the above-mentioned prior art, and to provide a vehicle glass with a barcode and a preparation process thereof. The barcode is formed by laser etching at the shielding layer position on the vehicle glass. The content of the code is unique and is associated with the management system to achieve product traceability and anti-counterfeiting purposes.

[0005] To this end, according to a first aspect of the present invention, a vehicle glass with a barcode is provided, the vehicle glass comprising a first glass, a second glass and an intermediate film arranged between the first glass and the second glass, wherein the first glass has a first surface facing the outside of the vehicle and a second surface adhered to the intermediate film; the second glass has a third surface adhered to the intermediate film and a fourth surface facing the inside of the vehicle; it is characterized in that a shielding layer is arranged on the second surface and / or the fourth surface, and a barcode formed by laser etching is arranged at a position corresponding to the shielding layer on the second surface and / or the fourth surface, and the barcode includes unique information of the glass and / or the vehicle.

[0006] Wherein, the vehicle glass is flat glass or curved glass.

[0007] Wherein, the curvature radius of the curved glass is greater than or equal to 50 mm.

[0008] Wherein, the barcode includes a one-dimensional code or a two-dimensional code or other text graphics.

[0009] Wherein, the barcode is in the shape of a square, a rectangle, a circle, an ellipse or other shapes.

[0010] Wherein, the long axis direction or the long side direction of the barcode is arranged to be substantially parallel to the central axis of the vehicle glass.

[0011] The vehicle glass includes a first long side located on the upper side, a second long side located on the lower side relative to the first long side, and two relatively short sides located on the left and right sides, and the barcode is set in the shielding layer area corresponding to the second long side.

[0012] The distance between the barcode and the upper edge of the shielding layer area corresponding to the second long side is between 5 and 30 mm.

[0013] The barcode is activated with a device that records unique information of the glass and / or vehicle.

[0014] Wherein, a first barcode and a second barcode are formed on the second surface and the fourth surface respectively, and the first barcode and the second barcode are staggered relative to the surface of the vehicle glass.

[0015] The first barcode and the second barcode are respectively used to record different information.

[0016] The barcode has a frosted white background, and its transparency is reduced by 10-30% relative to the transparency of vehicle glass.

[0017] Wherein, the surface roughness Ra of the frosted white background of the barcode is between 0.1 and 0.8.

[0018] Among them, when a shielding layer is only provided on the second surface, or a shielding layer is only provided on the fourth surface, when observed from the outside of the vehicle, the barcode formed on the shielding layer has a frosted white background, which shields the color of objects inside the vehicle (such as the center console), thereby improving the contrast of the barcode.

[0019] According to a second aspect of the present invention, a process for preparing vehicle glass with a barcode is further provided, wherein the vehicle glass comprises a first glass, a second glass, and an intermediate film disposed between the first glass and the second glass, wherein the first glass has a first surface facing the outside of the vehicle and a second surface adhered to the intermediate film; and the second glass has a third surface adhered to the intermediate film and a fourth surface facing the inside of the vehicle; wherein the preparation process comprises the following steps:

[0020] (1) providing a first glass and a second glass;

[0021] (2) a shielding layer is provided on the second surface and / or the fourth surface;

[0022] (3) corresponding to the position of the shielding layer, a barcode is formed on the second surface and / or the fourth surface by laser etching, wherein the barcode includes unique information of the glass and / or the vehicle;

[0023] (4) forming the first glass and the second glass in a heat bending furnace;

[0024] (5) An intermediate film is sandwiched between the first glass and the second glass.

[0025] Wherein, the vehicle glass is curved glass, and the radius of curvature is greater than or equal to 50 mm.

[0026] The barcode in step (3) has a frosted white background, and its transparency is at least 10% lower than that of the vehicle glass.

[0027] The barcode in step (3) has a frosted white background, and its surface roughness Ra is between 0.1 and 0.8.

[0028] Wherein, when the vehicle glass being prepared is flat glass, step (4) is omitted.

[0029] The order of step (3) and step (4) can be interchanged.

[0030] Wherein, before the step (4), the method further includes the step of pre-sintering the first glass and / or the second glass.

[0031] Wherein, in the step (3), the barcode is formed only on the fourth surface by laser etching, and before the step (4), there is no need to pre-sinter the first glass and / or the second glass.

[0032] Among them, when a shielding layer is only provided on the second surface, or a shielding layer is only provided on the fourth surface, when observed from the outside of the vehicle, the barcode formed on the shielding layer has a frosted white background, which shields the color of objects inside the vehicle (such as the center console), thereby improving the contrast of the barcode.

[0033] In summary, compared with the prior art, the present invention has at least the following technical effects:

[0034] (1) The vehicle glass with a barcode provided by the present invention obtains a patterned barcode by laser etching the shielding layer on the vehicle glass. The pattern is clear and can be easily identified by a mobile phone or other scanning device to obtain the authenticity and product information, including the product number, name, brand, model and year, etc. It is not easy to be damaged and is permanently valid;

[0035] (2) It overcomes the shortcomings of traditional transfer printing, screen printing and other processes, and can achieve uniqueness or customization of the barcode obtained by each laser etching;

[0036] (3) When both the second surface and the fourth surface of the vehicle glass are provided with a shielding layer, when observed from the outside of the vehicle, the barcode provided on the shielding layer on the second surface has a frosted white background, which shields the color of the shielding layer on the fourth surface, thereby improving the black-and-white contrast of the barcode; and when observed from the inside of the vehicle, the barcode provided on the shielding layer on the fourth surface has a frosted white background, which shields the color of the shielding layer on the second surface, thereby improving the black-and-white contrast of the barcode; when only the shielding layer is provided on the second surface, or the shielding layer is provided on the fourth surface, when observed from the outside of the vehicle, the barcode formed on the shielding layer has a frosted white background, which shields the color of the object inside the vehicle (such as the center console), thereby improving the contrast of the barcode and improving the recognizability of the code;

[0037] (4) The process for preparing vehicle glass with a barcode provided by the present invention is applicable not only to the barcode production of curved glass but also to the barcode production of flat glass. When used to produce a barcode on flat glass, it is easier to achieve when the laser head is facing the normal direction of the glass, and the operation is more convenient. The equipment can be installed after the glass is formed, and the barcode obtained by laser etching can be concentrated, and the layout is flexible. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0039] Figure 1 This is a front view of a vehicle glass with a barcode provided in Example 1 of the present invention.

[0040] Figure 2 4 is a cross-sectional view of vehicle glass with a barcode provided in Example 1 of the present invention.

[0041] Figure 3 This is a front view of the vehicle glass with a barcode provided in Example 2 of the present invention.

[0042] Figure 4 4 is a cross-sectional view of vehicle glass with a barcode provided in Example 3 of the present invention.

[0043] Figure 5 It is a front view of the vehicle glass with a barcode prepared in Example 4 of the present invention.

[0044] Figure 6 It is a front view of the vehicle glass with a barcode prepared in Example 4 of the present invention.

[0045] Figure 7 yes Figure 5 A local enlarged schematic diagram of the laser etching area.

[0046] Figure 8 It is a schematic diagram of laser etching focused on the glass surface during the preparation process of vehicle glass with a barcode according to Example 4 of the present invention. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] Example 1

[0049] The present invention provides a vehicle glass, which can be any vehicle glass of a car, a bus, a truck, a tractor, a special transport vehicle, a special vehicle and the like.

[0050] See also Figure 1-2The vehicle glass comprises a first glass 101, a second glass 102 and an intermediate film 103 disposed between the first glass 101 and the second glass 102, wherein the first glass has a first surface 1011 facing the outside of the vehicle and a second surface 1012 adhered to the intermediate film; the second glass has a third surface 1021 adhered to the intermediate film and a fourth surface 1022 facing the inside of the vehicle; characterized in that shielding layers 21, 22 are disposed on the second surface 1012 and the fourth surface 1022, and bar codes 104, 105 formed by laser etching are disposed at positions corresponding to the shielding layers on the second surface 1012 and / or the fourth surface 1022, and the bar codes include unique information of the glass and / or the vehicle. A barcode can be a graphic identifier that arranges a plurality of black bars and spaces of different widths according to certain coding rules to express a group of information.

[0051] Furthermore, the vehicle glass is a flat glass or a curved glass, and in this embodiment, the curved glass is preferably used as the windshield glass. Furthermore, the curvature radius of the curved glass is greater than or equal to 200 mm.

[0052] Furthermore, the vehicle glass includes a first long side 11 located at the upper side, a second long side 12 located at the lower side and arranged relative to the first long side, and two relatively short sides 13 and 14 located at the left and right sides.

[0053] Furthermore, the material of the intermediate film 103 is generally polyvinyl butyral (PVB), which has excellent softness, flexibility and adhesion.

[0054] Furthermore, the barcode may include a one-dimensional code or a two-dimensional code or other text graphics, and a one-dimensional code is preferred in this embodiment. The shape of the barcode may be a square or a rectangle or a circle or an ellipse or other shapes, and a rectangle is preferred in this embodiment. The position of the barcode may be located in the shielding layer area at the edge of the vehicle glass, and in this embodiment, the barcode is preferably arranged in the shielding layer area corresponding to the second long side 12. Furthermore, since the middle area of ​​the vehicle glass is relatively flat, the long axis direction or the long side direction of the one-dimensional barcode is preferably arranged in this embodiment to be roughly parallel to the central axis of the vehicle glass, which is conducive to the focusing operation of the laser during the laser etching process.

[0055] The barcode can include unique information about both the glass and the vehicle. For example, the glass information may include the manufacturer, product name, manufacturing date, and glass properties (such as interlayer); the vehicle information may include: brand, model, body structure, year, OEM abbreviation, etc.

[0056] Example 2

[0057] like Figure 3 As shown, this embodiment is substantially the same as the embodiment 1, except that the barcode 104 of this embodiment is arranged in the shielding layer area 22 corresponding to the second long side 12. Specifically, the barcode 104 can be arranged on the left side of the shielding layer area 22, i.e., the lower left corner area of ​​the vehicle glass; the barcode 104 can also be arranged on the right side of the shielding layer area 22, i.e., the lower right corner area of ​​the vehicle glass. It can be understood that by arranging the barcode 104 in the corner of the shielding layer area, the interference of the barcode to the human eye during the driving of the vehicle can be avoided or reduced, so as to ensure safe driving.

[0058] Example 3

[0059] like Figure 4 As shown, this embodiment is substantially the same as the embodiment 1, except that: the embodiment 1 is provided with a barcode 104 formed by laser etching only at a position corresponding to the shielding layer on the second surface 1012, while this embodiment is provided with a first barcode 104 and a second barcode 105 formed by laser etching at positions corresponding to the shielding layer on the second surface 1012 and the fourth surface 1022, respectively. The first barcode 104 and the second barcode 105 are staggered relative to the surface of the vehicle glass, that is, they do not overlap in the horizontal projection plane of the vehicle glass, so that overlapping or ghosting phenomena can be avoided when a scanner, mobile phone or other tool recognizes the barcode, thereby improving the accuracy and efficiency of barcode recognition. Specifically, the first barcode 104 and the second barcode 105 can be staggered in the upper and lower positions relative to the plane of the vehicle glass, or can be staggered in the left and right positions. Optionally, the first barcode 104 and the second barcode 105 can record different information respectively, for example, the first barcode 104 is used to record glass information, while the second barcode 105 is used to record vehicle information; or the second barcode 105 facing the interior of the vehicle is used to record glass and vehicle information, and needs to be activated by a device that records the unique information of the glass and the vehicle, and imports data to achieve association with the management system. In order to ensure the security of the data, it cannot be changed for vehicle users or non-manufacturers, and is only used to query products or verify authenticity, while for vehicle glass manufacturers, it can be used to trace products or after-sales service; and the first barcode 104 facing the outside of the vehicle can be used to record other information of the vehicle, such as importing the annual vehicle inspection information certified by the vehicle management agency, or importing the vehicle user's car moving phone number, which can be made public, changed or closed as needed to achieve the purpose of limited-time or permanent sharing or informing others.

[0060] Example 4

[0061] like Figure 5 , 6As shown in Figures 1 and 7, this embodiment provides a process for preparing vehicle glass with a barcode, comprising: the vehicle glass is used as a windshield glass, comprising a first glass 101, a second glass 102, and an intermediate film 103 disposed between the first glass 101 and the second glass 102, the first glass having a first surface 1011 facing the outside of the vehicle and a second surface 1012 adhered to the intermediate film; the second glass having a third surface 1021 adhered to the intermediate film and a fourth surface 1022 facing the inside of the vehicle; the preparation process comprises the following steps:

[0062] First, a first glass 101 and a second glass 102 are provided;

[0063] Secondly, shielding layers 21, 22 are printed on the second surface 1012 and / or the fourth surface 1022, and the shielding layer material may be an ink layer;

[0064] Then, corresponding to the positions of the shielding layers 21 and 22, a barcode 105 is formed on the second surface 1012 and / or the fourth surface 1022 by laser etching, wherein the barcode includes unique information of the glass and / or the vehicle;

[0065] Next, the first glass 101 and the second glass 102 are molded or self-weighted in a heat bending furnace;

[0066] Finally, an intermediate film 103 is sandwiched between the first glass and the second glass that are heat-bent.

[0067] Specifically, the step of laser etching to form a barcode includes: using a fiber laser. Since the fiber laser will not react to glass, the removal of glass material can be avoided. The diameter of the circular spot of the laser is 0.03mm, the wavelength can be selected as 1064nm, the laser power can be selected as 42W, the frequency can be 650KHz, and the etching speed can be selected as 4000mm / s. The laser etching position can be at a specified position in the windshield printing area, preferably in the middle area of ​​the shielding layer 22. The local shielding layer (ink layer) is removed by laser etching to form a frosted white background effect, which is combined with the remaining ink layer in the etching area to form a barcode. Generally speaking, the transmittance (transparency) of the transparent area of ​​the front windshield is generally higher than 75%, and the frosted white background can reduce the transparency by at least 10%, preferably by 30-50%. Generally speaking, the surface roughness Ra of the glass before laser etching is about 0.01. After laser etching, the surface roughness Ra of the barcode with a frosted white background on the glass is between 0.1 and 0.8. That is to say, the roughness of the white background area of ​​the barcode formed after the partial shielding layer is removed by laser etching increases and the transparency decreases.

[0068] Since laser etching has high requirements for focal length, it is necessary to adjust the height position of the laser head before laser etching each piece of glass. For laser etching barcodes on curved glass, the laser head can be installed at the end of the robot, and the laser real-time distance measurement and posture correction at the end of the robot can be used to overcome the surface fluctuation of the curved glass to maintain accurate focal length.

[0069] In order to maintain the consistency of the depth of the barcode formed by laser etching, thereby ensuring the consistency of the color of the frosted white background, the laser head is facing the normal direction of the curved glass as much as possible. The specific process includes: a red light square pattern is pre-projected onto the glass surface. The pattern is consistent with the size and position of the engraved code. For new varieties or batches of glass products, the projected red light pattern can be measured to see if it is a square. If the length and width are inconsistent, it can be determined that the laser head is not in the normal direction of the etching surface. The laser head posture should be readjusted until the red light pattern is a square.

[0070] Since the laser focal length and object distance deviation can be within the range of plus or minus 0.5mm, the surface to be engraved can be etched, that is, the focus error range can be within h = 1mm to achieve laser etching. Taking the curved windshield glass with multiple curvature radii as an example, it can include a surface with a curvature radius of 50mm, a surface with a curvature radius of 200mm, and even a surface with a curvature radius gradually changing from 50mm to 200mm. Taking the glass surface with a curvature radius R of 200mm as an example, laser etching is performed on the glass surface to form a QR code, such as Figure 8 The size of the graphic shown in combination with trigonometric calculations yields L = 39.95 mm, which is approximately equal to 40 mm, and the maximum size of the laser-etched barcode that can be obtained is approximately 40 mm × 40 mm.

[0071] Furthermore, the barcode of this embodiment is preferably a two-dimensional code, which is square and can be 12mm×12mm in size, and is located in the shielding layer area corresponding to the second long side of the front windshield, that is, in the area of ​​the large black border (lower shielding layer) at the bottom of the glass, preferably in the central area of ​​the shielding layer. The height h of the large black border is about 30mm to 200mm, and the distance d between the two-dimensional code and the upper edge of the shielding layer area corresponding to the second long side (from the upper edge of the large black border) is preferably 5mm to 30mm. If d is too small (less than 5mm), the shielded area to be laser etched is too close to the transparent area of ​​the glass, which is not conducive to the formation of a certain contrast between the two-dimensional code formed by laser etching and the surrounding shielding layer, and is not conducive to the rapid and effective recognition of the two-dimensional code by tools such as scanners and mobile phones; and if d is too large (more than 30mm), that is, the shielded area to be laser etched has insufficient margin from the lower edge of the second longest side of the glass, then when the windshield is installed on the vehicle, it is generally necessary to reserve a part of the peripheral edge of the glass to be embedded in the vehicle body or surrounded by the body trim. If d is too large, part of the two-dimensional code pattern may be blocked, resulting in failure of two-dimensional code recognition. Therefore, it is preferred that d is between 5mm and 30mm.

[0072] It should be noted that in this embodiment, the barcode is only formed on the fourth surface by laser etching. Therefore, before the intermediate film is sandwiched between the first glass and the second glass, there is no need to pre-sinter the first glass and / or the second glass, which can shorten the preparation process of the vehicle glass with a barcode. When the shielding layer is only provided on the fourth surface, the barcode formed on the shielding layer has a frosted white background when observed from the outside of the vehicle, which shields the color of the objects inside the vehicle (such as the center console), thereby improving the contrast of the barcode, so that the barcode can be effectively identified. When the barcode is formed on the second surface by laser etching, or on the second surface and the fourth surface by laser etching, before the intermediate film is sandwiched between the first glass and the second glass, the first glass and / or the second glass need to be pre-sintered so that the ink layer is pre-sintered and solidified on the glass surface, so as to avoid the process defects caused by the ink layer splashing during the laser etching process, thereby ensuring the performance and stability of the glass. When a shielding layer is provided on the second and fourth surfaces, when observed from the outside of the vehicle, the barcode provided on the shielding layer on the second surface has a frosted white background, which shields the color of the shielding layer on the fourth surface, thereby improving the black-and-white contrast of the barcode, so that the barcode can be effectively identified; and when observed from the inside of the vehicle, the barcode provided on the shielding layer on the fourth surface has a frosted white background, which shields the color of the shielding layer on the second surface, thereby improving the black-and-white contrast of the barcode, so that the barcode can be effectively identified. It is easy to understand that when a shielding layer is provided only on the second surface, and no shielding layer is provided on the fourth surface, when observed from the outside of the vehicle, the barcode formed on the shielding layer has a frosted white background, which shields the color of objects inside the vehicle (such as the center console), thereby improving the contrast of the barcode, so that the barcode can be effectively identified.

[0073] It should be supplemented that, in this embodiment, the barcode 105 is first formed on the second surface 1012 and / or the fourth surface 1022 by laser etching, and the barcode includes unique information of the glass and / or the vehicle; then, the first glass 101 and the second glass 102 are molded in a heat bending furnace; in the actual production process, the first glass 101 and the second glass 102 may be molded in a heat bending furnace first, and then the barcode 105 is formed on the second surface 1012 and / or the fourth surface 1022 by laser etching. It can be understood that in the preparation process of the vehicle glass with a barcode provided in this embodiment, the process step of laser etching to form the barcode can be performed before molding in a heat bending furnace, that is, for example, on a flat glass, or can be performed after molding in a heat bending furnace, for example, on a curved glass.

[0074] In summary, the process for preparing vehicle glass with a barcode provided by the present invention is applicable not only to the barcode production of curved glass, but also to the barcode production of flat glass. When used to produce a barcode on flat glass, it is easier to achieve when the laser head is facing the normal direction of the glass, and the operation is simpler. Compared with the prior art, the present invention overcomes the shortcomings of traditional transfer printing, screen printing, etc., and can achieve that the barcode obtained by each laser etching is unique or customizable.

[0075] What is disclosed above is only a preferred embodiment of the present invention, which certainly cannot be used to limit the scope of rights of the present invention. A person skilled in the art can understand that all or part of the processes of the above embodiments and equivalent changes made according to the claims of the present invention still fall within the scope of the invention.

Claims

1. A vehicle glass with a barcode, the vehicle glass comprising a first glass, a second glass and an intermediate film disposed between the first glass and the second glass, wherein: The first glass has a first surface facing the outside of the vehicle and a second surface adhered to the intermediate film; the second glass has a third surface adhered to the intermediate film and a fourth surface facing the inside of the vehicle; it is characterized in that a shielding layer is arranged on the second surface and / or the fourth surface, and a barcode formed by laser etching is arranged at a position corresponding to the shielding layer on the second surface and / or the fourth surface, the barcode includes unique information of the glass and / or the vehicle, the barcode has a frosted white background, its transparency is reduced relative to the transparency of the vehicle glass, and / or its surface roughness is increased relative to the surface roughness of the vehicle glass.

2. The vehicle glass with a barcode according to claim 1, characterized in that: The vehicle glass is flat glass or curved glass.

3. The vehicle glass with a barcode according to claim 2, characterized in that: The curvature radius of the curved glass is greater than or equal to 50 mm.

4. The vehicle glass with a barcode according to claim 1, characterized in that: The barcode includes a one-dimensional code or a two-dimensional code.

5. The vehicle glass with a barcode according to claim 1, characterized in that: The barcode is in the shape of a square, a rectangle, a circle or an ellipse.

6. The vehicle glass with a barcode according to claim 1, characterized in that: The long axis direction or long side direction of the barcode is arranged to be parallel to the central axis of the vehicle glass.

7. The vehicle glass with a barcode according to claim 1, characterized in that: The vehicle glass includes a first long side located at the upper side, a second long side located at the lower side relative to the first long side, and two relatively short sides located at the left and right sides, and the barcode is set in the shielding layer area corresponding to the second long side.

8. The vehicle glass with a barcode according to claim 7, characterized in that: The distance between the barcode and the upper edge of the shielding layer area corresponding to the second long side is between 5 mm and 30 mm.

9. The vehicle glass with a barcode according to claim 1, characterized in that: The barcode is activated with a device that records unique information about the glass and / or vehicle.

10. The vehicle glass with a barcode according to claim 1, characterized in that: A first barcode and a second barcode are formed on the second surface and the fourth surface respectively, and the first barcode and the second barcode are staggered relative to the surface of the vehicle glass.

11. The vehicle glass with a barcode according to claim 10, characterized in that: The first barcode and the second barcode are used to record different information respectively.

12. The vehicle glass with a barcode according to claim 1, characterized in that: The barcode has a frosted white background, the transparency of which is reduced by at least 10% relative to the transparency of the vehicle glass.

13. The vehicle glass with a barcode according to claim 12, characterized in that: The surface roughness Ra of the frosted white background of the barcode is between 0.1 and 0.

8.

14. The vehicle glass with a barcode according to claim 12, characterized in that: When a shielding layer is provided only on the second surface, or a shielding layer is provided only on the fourth surface, when observed from the outside of the vehicle, the barcode formed on the shielding layer has a frosted white background, which shields the color of objects inside the vehicle, thereby improving the contrast of the barcode.

15. A process for preparing vehicle glass with a barcode, comprising: The vehicle glass comprises a first glass, a second glass and an intermediate film disposed between the first glass and the second glass, wherein the first glass has a first surface facing the outside of the vehicle and a second surface adhered to the intermediate film; the second glass has a third surface adhered to the intermediate film and a fourth surface facing the inside of the vehicle; and the preparation process comprises the following steps: (1) providing a first glass and a second glass; (2) a shielding layer is provided on the second surface and / or the fourth surface; (3) a barcode is formed on the second surface and / or the fourth surface by laser etching corresponding to the position of the shielding layer, wherein the barcode includes unique information of the glass and / or the vehicle, and the barcode has a frosted white background, the transparency of which is reduced relative to the transparency of the vehicle glass, and / or the surface roughness of which is increased relative to the surface roughness of the vehicle glass; (4) forming the first glass and the second glass in a heat bending furnace; (5) An intermediate film is sandwiched between the first glass and the second glass.

16. The process for preparing vehicle glass with a barcode according to claim 15, characterized in that: The vehicle glass is flat glass or curved glass.

17. The process for preparing vehicle glass with a barcode according to claim 16, characterized in that: The curvature radius of the curved glass is greater than or equal to 50 mm.

18. The process for preparing vehicle glass with a barcode according to claim 15, characterized in that: The barcode in step (3) has a frosted white background, the transparency of which is reduced by at least 10% relative to the transparency of vehicle glass.

19. The process for preparing vehicle glass with a barcode according to claim 18, characterized in that: The surface roughness Ra of the frosted white background of the barcode is between 0.1 and 0.

8.

20. The process for preparing vehicle glass with a barcode according to claim 15, characterized in that: The order of step (3) and step (4) can be interchanged.

21. The process for preparing vehicle glass with a barcode according to claim 15, characterized in that: If the vehicle glass being prepared is flat glass, step (3) can be omitted.

22. The process for preparing vehicle glass with a barcode according to claim 15, characterized in that: Before the step (5), the method further includes the step of pre-sintering the first glass and / or the second glass.

23. The process for preparing vehicle glass with a barcode according to claim 15, characterized in that: In the step (3), the barcode is formed only on the fourth surface by laser etching. Therefore, before the step (5), there is no need to pre-sinter the first glass and / or the second glass.

24. The process for preparing vehicle glass with a barcode according to claim 15, characterized in that: When a shielding layer is provided only on the second surface, or a shielding layer is provided only on the fourth surface, when observed from the outside of the vehicle, the barcode formed on the shielding layer has a frosted white background, which shields the color of objects inside the vehicle, thereby improving the contrast of the barcode.

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