Glass soldering method and apparatus

Abstract

The application discloses a glass welding method and device, which comprises the following steps: step S1: clamping a first glass and a second glass along the edges of the first glass and the second glass to form a welding area near the edges of the first glass and the second glass, the welding area meeting optical contact requirements; step S2: determining the position of a contact surface of the first glass and the second glass at any point in the welding area, and determining the position of a focal point according to the position of the contact surface of the first glass and the second glass; step S3: performing laser welding on the first glass and the second glass at the position of the focal point; and step S4: determining a next position point along the welding area, and repeating steps S2 to S4 until at least one round of welding along the edges of the first glass and the second glass is completed. The application can ensure that the welding area meets optical contact, and the measurement of the position of the focal point and the welding are synchronously performed during the welding process, so that the efficiency of the measurement of the position of the focal point is improved and efficient welding is achieved.

Description

Technical Field

[0001] This invention relates to the field of glass welding, and more particularly to a glass welding method and apparatus. Background Technology

[0002] Glass is a material with excellent transparency and chemical stability. Its raw materials are abundant and inexpensive, allowing for large-scale production. Since its discovery, glass has been widely used and has seen significant development in numerous fields such as construction, transportation, medicine, chemistry, and electronics. Especially in recent years, with the emergence and upgrading of sensitive devices such as solar cells, microelectronic chips, and organic light-emitting diodes (OLEDs) that require specific conditions to perform, glass encapsulation applications have gained widespread attention. Beyond its auxiliary role in encapsulation and protection, glass itself has been continuously upgraded in the industry. For example, insulated glass and vacuum glass, derived from glass in construction and transportation, have demonstrated excellent performance in energy saving, sound insulation, noise reduction, and preventing condensation and frost. Whether it's sensitive electronic components requiring glass encapsulation protection or the manufacture of special glasses such as insulated glass and vacuum glass, a strong connection between the glass panes is a crucial step. Traditional glass bonding methods mainly include three types: anodic bonding, adhesive bonding, and thermal fusion bonding. Adhesive bonding requires the introduction of another material, which can easily lead to contamination and adversely affect the product. Furthermore, prolonged use and harsh environments can easily cause irreversible damage. Anodic bonding and thermal fusion bonding are characterized by high energy consumption and significant thermal impact on the glass. After cooling, the glass product is prone to deformation, which can even lead to breakage. In addition, the high temperatures generated during the process of anodic bonding and thermal fusion bonding can also cause some protected sensitive components to fail, making the actual effect less than ideal.

[0003] In comparison, laser glass welding exhibits unique advantages in the aforementioned glass joining fields. It utilizes an ultrashort pulse laser applied to a very small area of ​​the glass. The glass interior nonlinearly absorbs the laser, causing multiphoton ionization and avalanche ionization, which melts the affected glass area and fills the gap between the two pieces of glass, thus welding them together. Because the laser spot is small (typically a few micrometers) and acts directly on the glass, it has minimal thermal impact and does not cause contamination. Compared to traditional glass joining methods, laser glass welding demonstrates superior performance. However, laser glass welding also has the following two problems:

[0004] First, optical contact needs to be achieved between the glass pieces (i.e., the gap between the glass pieces needs to be controlled within 3μm) so that the gap between the glass pieces can be effectively filled when the laser is applied.

[0005] Second, it is necessary to control the laser spot to act on a reasonable position relative to the glass contact surface (i.e., the focal position), and thus it is necessary to overcome the focal fluctuation at different positions of the glass.

[0006] Currently, the methods to solve the problems of optical contact and focal point fluctuation in glass are: stacking two pieces of glass on a tooling pressing platform; and using a rangefinder to measure and record data (record the focal point position) before welding begins. Figure 1 As shown, when two pieces of glass 10 are stacked on the tooling pressing platform, the two pieces of glass 10 are pressed together by applying force on one side (such as by applying pressure using the pressing tool 20). However, in actual operation, the warping of the glass 10 will cause undulations of more than 100μm on its surface. Therefore, during the pressing process, the warped position of the glass 10 will be pressed flat with the platform as a whole. At this time, the internal stress of the two pieces of glass 10 is generated by the strong flattening and is transmitted to the other side opposite to the warped position. If the warped glass 10 is severely warped, it may break due to excessive internal stress. The transmission of stress will aggravate the warping on the other side of the glass 10, which may lead to the glass 10 being unable to be clamped. In addition, after the pressing tool is removed after welding, the stress generated by the glass 10 returning to its original warped state from flattening will cause great damage to the welding surface, resulting in unstable welding.

[0007] To determine the focal point, a rangefinder is used to measure and record data along the edge of the glass before welding. The focal point is then determined based on the recorded data, and the laser power is dynamically adjusted for welding. It should be noted that during the welding process, the glass not only fluctuates along the welding path but also perpendicular to it. Therefore, if multiple welds are made at equal intervals, the first and last weld lines will inevitably have a significant difference (to meet the welding strength requirements, multiple weld lines are welded from the center to the edge of the glass 10. Since the multiple weld lines do not overlap, there will be warping, thickness differences, and other variations between the first and last weld lines, which will lead to changes in the focal point). If a welding method of measuring the focal point and welding one weld line at a time is adopted, the welding efficiency will be greatly reduced, and the requirements for efficient and precise welding cannot be met.

[0008] Therefore, based on years of experience and practice in related industries, the inventor proposes a glass welding method and apparatus to overcome the shortcomings of the prior art. Summary of the Invention

[0009] The purpose of this invention is to provide a glass welding method and apparatus that, when welding two pieces of glass, ensures that the entire welding area achieves optical contact, and that the measurement of the focal point position and the welding are performed simultaneously during the welding process, thereby improving the efficiency of focal point position measurement and achieving high-efficiency welding.

[0010] The objective of this invention can be achieved through the following methods:

[0011] This invention provides a glass welding method for welding a first glass and a second glass, the method comprising the following steps:

[0012] Step S1: Clamp the first glass and the second glass along their edges to form a welding area near the edges of the first glass and the second glass, the welding area satisfying optical contact requirements;

[0013] Step S2: Determine the position of the contact surface between the first glass and the second glass at any point in the welding area, and determine the focal point position based on the position of the contact surface between the first glass and the second glass;

[0014] Step S3: Perform laser welding on the first glass and the second glass at the focal position;

[0015] Step S4: Determine the next location point along the welding area, and repeat steps S2 to S4 until at least one circle of welding is completed along the edges of the first glass and the second glass.

[0016] In a preferred embodiment of the present invention, the welding area is an annular region extending along the edges of the first glass and the second glass.

[0017] In a preferred embodiment of the present invention, multiple clamps are used to clamp along the edges of the first glass and the second glass so that the entire welding area is a ring.

[0018] In a preferred embodiment of the invention, the first glass and the second glass are stacked and placed on top of the raised platform so that the plurality of clamps and the welding area are in a suspended position.

[0019] In a preferred embodiment of the present invention, the optical contact requirement includes a distance of less than 3 μm between the first glass and the second glass.

[0020] In a preferred embodiment of the present invention, the first glass and the second glass are one or any two of the following: original glass, chemically tempered glass, physically tempered glass, laminated glass, and coated glass.

[0021] In a preferred embodiment of the present invention, step S2 includes:

[0022] Step S201: Determine the glass position and the front and back sides of the glass. Of the first glass and the second glass, one is the front glass and the other is the back glass. The laser is incident on the front glass for welding.

[0023] Step S202: Determine the welding area, taking any point in the welding area as the starting position point;

[0024] Step S203: Determine the height of the contact surface between the first glass and the second glass at the starting position point;

[0025] Step S204: Determine the height of the focal point at the starting position point based on the height of the contact surface between the first glass and the second glass at the starting position point.

[0026] In a preferred embodiment of the present invention, the front glass is light-transmitting glass and the back glass is light-blocking glass.

[0027] In a preferred embodiment of the present invention, in step S201, a mark is provided on the first glass and / or the second glass to identify the position of the glass and the front and back of the glass.

[0028] This invention provides a glass welding apparatus suitable for the aforementioned glass welding method, the glass welding apparatus comprising:

[0029] A raised platform for horizontally supporting a first and second glass pane that are stacked on top of it;

[0030] Multiple clamps are used to clamp the first glass and the second glass along their edges to form a welding area near the edges of the first glass and the second glass.

[0031] A light source and a scanning device are provided, wherein the light source and the scanning device are movably disposed above the first glass and the second glass, the light source and the scanning device are used to determine the position of the contact surface between the first glass and the second glass, determine the focal position based on the position of the contact surface between the first glass and the second glass, and perform laser welding at the focal position.

[0032] In a preferred embodiment of the invention, the plurality of clamps and the welding area are located in a suspended position.

[0033] In a preferred embodiment of the present invention, the glass welding apparatus further includes a support platform, and the raised platform is disposed on top of the support platform, wherein the cross-sectional area of ​​the raised platform is smaller than the annular area enclosed by the welding area.

[0034] In a preferred embodiment of the present invention, the light source and scanning device include at least a laser light source and a scanner. The scanner is used to obtain the height of the contact surface between the first glass and the second glass at any point in the welding area, and the laser light source is used to perform laser welding on the first glass and the second glass at the focal point.

[0035] In a preferred embodiment of the present invention, the glass welding apparatus further includes an image acquisition device, which is used to identify the position of the glass and the front and back sides of the glass based on the markings provided on the first glass and / or the second glass.

[0036] As described above, the glass welding method and apparatus of the present invention have the following features and advantages: Before welding the first glass and the second glass, the first glass and the second glass are clamped along their edges, thereby forming a welding area near the edges of the first glass and the second glass. This welding area meets the optical contact requirements, thus effectively filling the gap between the first glass and the second glass corresponding to the welding area during laser welding, ensuring stable welding of the first glass and the second glass. In addition, before welding the first glass and the second glass, any point in the welding area can be used as the starting point for welding, and the focal point is determined based on the contact position of the first glass and the second glass at the starting point. Laser welding is then performed on the first glass and the second glass at this focal point. After completing the laser welding at this focal point, the next focal point is determined and laser welding is performed until at least one circle of welding is completed along the edges of the first glass and the second glass within the welding area. This process involves simultaneous measurement of the focal point and laser welding, thereby improving the efficiency of focal point measurement and achieving high-efficiency welding. Attached Figure Description

[0037] The accompanying drawings are intended only to illustrate and explain the present invention and do not limit the scope of the invention.

[0038] in:

[0039] Figure 1 This is a schematic diagram of a glass welding structure in the prior art.

[0040] Figure 2 This is one of the flowcharts for the glass welding method of the present invention.

[0041] Figure 3 This is the second flowchart of the glass welding method of the present invention.

[0042] Figure 4 : This is a front cross-sectional view of the glass welding apparatus of the present invention.

[0043] Figure 5 : This is a top view of the glass welding apparatus of the present invention.

[0044] The reference numerals in the background art are:

[0045] 10. Glass; 20. Pressing fixture.

[0046] The reference numerals in the accompanying drawings of this invention are:

[0047] 1. First glass; 2. Second glass;

[0048] 3. Fixture; 4. Light source and scanning device;

[0049] 5. Welding area; 6. Elevated platform;

[0050] 7. Supporting platform. Detailed Implementation

[0051] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0052] Implementation Method 1

[0053] like Figure 4 , Figure 5 As shown, the present invention provides a glass welding apparatus for welding a first glass 1 and a second glass 2 stacked together. The glass welding apparatus includes a raised platform 6, a light source and scanning device 4, and multiple clamps 3. The raised platform 6 is used to support the stacked first glass 1 and the second glass 2 placed on top of it in a horizontal direction. The multiple clamps 3 are spaced apart and evenly arranged along the edges of the first glass 1 and the second glass 2, thereby clamping the first glass 1 and the second glass 2 along the edges of the first glass 1 and the second glass 2 to form a welding area 5 near the edges of the first glass 1 and the second glass 2. The light source and scanning device 4 is movably disposed above the first glass 1 and the second glass 2, and is used to determine the position of the contact surface between the first glass 1 and the second glass 2, determine the focal point position based on the position of the contact surface between the first glass 1 and the second glass 2, and perform laser welding at the focal point position.

[0054] In this invention, before welding the first glass 1 and the second glass 2, multiple clamps 3 are used to clamp the first glass 1 and the second glass 2 along their edges, so that the first glass 1 and the second glass 2 are pressed together as a whole. This prevents changes to the local positions of the first glass 1 and the second glass 2 (such as the positions on the first glass 1 and the second glass 2 corresponding to the welding area 5) and the warping relationship between the main body of the first glass 1 and the second glass 2, minimizing the negative impact of the glass warping itself on laser welding. A welding area 5 is formed near the edge of the first glass 1 and the second glass 2. This welding area 5 meets the optical contact requirements (i.e., the distance between the first glass 1 and the second glass 2 is less than 3 μm), so that the gap between the first glass 1 and the second glass 2 corresponding to the welding area 5 can be effectively filled during laser welding, ensuring a stable weld between the first glass 1 and the second glass 2.

[0055] In this invention, the clamp 3 can be an existing clamping member or clamping structure that can clamp and fix the first glass 1 and the second glass 2 and ensure that the welding area 5 formed by the first glass 1 and the second glass 2 meets the optical contact requirements. The specific structure of the clamp 3 is not limited here.

[0056] In an optional embodiment of the present invention, such as Figure 4 As shown, the cross-sectional area of ​​the raised platform 6 is smaller than the annular area enclosed by the welding area 5, thus placing the multiple clamps 3 and the welding area 5 in a suspended position (i.e., the bottoms of the multiple clamps 3 and the welding area 5 are not supported by the raised platform 6). On the one hand, this prevents the clamps 3 from colliding during the welding process and affecting the clamping stability; on the other hand, it allows the welding area 5 to form a complete ring, ensuring the overall stability after laser welding.

[0057] Furthermore, such as Figure 4 , Figure 5 As shown, the glass welding device also includes a support platform 7, which is fixed on the welding station. A raised platform 6 is fixedly installed on the top of the support platform 7. The top of the raised platform 6 is a plane, which is used to stably support the first glass 1 and the second glass 2.

[0058] In an optional embodiment of the present invention, such as Figure 4As shown, the light source and the scanning device 4 at least include a laser light source and a scanner. The scanner is used to obtain the height of the contact surface between the first glass 1 and the second glass 2 at any point in the welding area 5, and the laser light source is used to perform laser welding on the first glass 1 and the second glass 2. Among them, the laser light source and the scanner are detachably connected or integrated into one body, so that the laser light source and the scanner can move synchronously during the working process. And during the movement along the welding area 5, the scanner acts before the laser light source. The scanner pre-determines the height of the contact surface between the first glass 1 and the second glass 2, and determines the focal position at this position according to the height of the contact surface between the first glass 1 and the second glass 2. After that, the laser light source is adjusted according to the focal position, and laser welding is performed on the first glass 1 and the second glass 2 at this focal position. This overall and efficient way of scanning and welding glass can greatly save time and avoid the influence of glass warping on the stability of the welded glass to the greatest extent.

[0059] In an optional embodiment of the present invention, the glass welding device further includes an image acquisition device (not shown). The image acquisition device can be arranged above the first glass 1 and the second glass 2. Before welding, the image acquisition device can identify the glass position and the front and back sides of the glass according to the marks set on the first glass 1 and / or the second glass 2. Among the first glass 1 and the second glass 2, one is the front glass and the other is the back glass. Generally, the front glass is a light-transmitting glass, and the back glass is a light-shielding glass (that is, an opaque glass or a semi-transparent glass). Since the back glass has poor light transmittance compared with the front glass, the front glass needs to face the incident direction of the laser light source so that the laser is incident from the front glass for welding.

[0060] Furthermore, the mark can be set on the front glass, or can be set on the back glass. Of course, different marks can also be set on the front glass and the back glass respectively, as long as the front glass and the back glass can be distinguished and identified. For example, the word "positive" can be marked on the front glass to determine the front glass.

[0061] Furthermore, the image acquisition device can be, but is not limited to, a CCD camera.

[0062] Embodiment 2

[0063] As Figures 2 to 5 shown, the present invention provides a glass welding method, which uses the above glass welding device to weld the first glass 1 and the second glass 2. The glass welding method includes the following steps:

[0064] Step S1: Multiple clamps 3 are used to clamp the first glass 1 and the second glass 2 along the edges to form a welding area 5 near the edges of the first glass 1 and the second glass 2. The welding area 5 is annular and meets the optical contact requirements.

[0065] Among them, the welding area 5 is an annular area extending along the edges of the first glass 1 and the second glass 2.

[0066] The optical contact requirement includes a distance of less than 3 μm between the first glass 1 and the second glass 2, so that the gap between the first glass 1 and the second glass 2 corresponding to the welding area 5 can be effectively filled during laser welding, ensuring stable welding of the first glass 1 and the second glass 2.

[0067] Step S2: Determine the position of the contact surface between the first glass 1 and the second glass 2 at any point in the welding area 5, and determine the focal point position based on the position of the contact surface between the first glass 1 and the second glass 2.

[0068] Step S3: Perform laser welding on the first glass 1 and the second glass 2 at the focal point;

[0069] Step S4: Determine the next location point along the welding area 5, and repeat steps S2 to S4 until welding at least one circle along the edges of the first glass 1 and the second glass 2.

[0070] In this invention, before welding the first glass 1 and the second glass 2, the first glass 1 and the second glass 2 are clamped along their edges, thereby forming a welding area 5 near the edges of the first glass 1 and the second glass 2. This welding area 5 meets the optical contact requirements, so that the gap between the first glass 1 and the second glass 2 corresponding to the welding area 5 can be effectively filled during laser welding, ensuring a stable weld between the first glass 1 and the second glass 2.

[0071] In this invention, before welding the first glass 1 and the second glass 2, any point in the welding area 5 can be used as the starting point for welding. The focal point is determined based on the position of the contact surface between the first glass 1 and the second glass 2 at the starting point. Laser welding is then performed on the first glass 1 and the second glass 2 at this focal point. After completing the laser welding at this focal point, the next focal point is determined and laser welding is performed until at least one circle (from 1 to 10,000 circles) of welding is performed along the edges of the first glass 1 and the second glass 2 within the welding area. This process involves simultaneous measurement of the focal point and laser welding, thereby improving the efficiency of focal point measurement and achieving high-efficiency welding.

[0072] In an optional embodiment of the present invention, such as Figure 4As shown, the first glass 1 and the second glass 2 are stacked and placed on top of the raised platform 6, so that the multiple clamps 3 and the welding area 5 are in a suspended position (i.e., the bottom of the multiple clamps 3 and the welding area 5 is not supported by the raised platform 6). On the one hand, this can prevent the clamps 3 from colliding during the welding process and affecting the clamping stability; on the other hand, it can make the welding area 5 form a complete ring, ensuring the overall stability after laser welding.

[0073] In an optional embodiment of the present invention, the first glass 1 and the second glass 2 may be, but are not limited to, one or any two of the following: original glass, chemically tempered glass, physically tempered glass, laminated glass, and coated glass.

[0074] In an optional embodiment of the present invention, such as Figure 3 As shown, step S2 includes:

[0075] Step S201: The glass position and the front and back of the glass are identified by the image acquisition device to determine the glass position and the front and back of the glass. In the first glass 1 and the second glass 2, one is the front glass and the other is the back glass. The laser is incident on the front glass for welding.

[0076] Step S202: Identify the welding area 5 using a scanner to determine the position of the welding area 5, taking any point in the welding area 5 as the starting position point;

[0077] Step S203: Identify the height of the contact surface between the first glass 1 and the second glass 2 at the starting position point using a scanner; since the thickness of the glass is on the order of millimeters (generally a few millimeters), while the laser spot is on the order of micrometers (generally a few micrometers), the difference in magnitude is 1000 times. Therefore, it is necessary to determine the height of the contact surface between the first glass 1 and the second glass 2 at the starting position point during actual welding. Figure 4 The position of the focal point in the Z-axis direction (i.e., the direction perpendicular to the wall of the glass) is determined to ensure that the laser spot can reach the focal point, thereby ensuring the stability of the welding between the first glass 1 and the second glass 2.

[0078] Step S204: Determine the height of the focal point at the starting position based on the height of the contact surfaces of the first glass 1 and the second glass 2 at the starting position. This can be done beforehand during welding experiments or during actual welding, recording the height of the focal point corresponding to the height of the contact surfaces of the first glass 1 and the second glass 2, and calculating and storing the difference between the two. During actual welding, by obtaining the height of the contact surfaces of the first glass 1 and the second glass 2, the difference between the height of the contact surfaces and the corresponding focal point can be directly retrieved, thus obtaining the height of the focal point at the starting position. Welding the first glass 1 and the second glass 2 at this height ensures the stability of the welding.

[0079] Further, as described in step S201, the front glass may be a light-transmitting glass, and the back glass may be a light-blocking glass. Since the back glass has poor light transmittance compared to the front glass, it is necessary to identify the front glass and the back glass before welding and orient the front glass towards the incident direction of the laser source so that the laser is incident from the front glass for welding.

[0080] Further, in step S201, marks are provided on the first glass 1 and / or the second glass 2 to identify the position of the glass and the front and back sides of the glass. The marks may be provided on the front glass, or on the back glass. Of course, different marks may also be provided on the front glass and the back glass respectively, as long as the front glass and the back glass can be distinguished and identified. For example, the word "front" may be marked on the front glass to determine the front glass.

[0081] The following is a specific embodiment of the present invention. Both the first glass 1 and the second glass 2 are soda-lime glass, and both the first glass 1 and the second glass 2 are raw sheet glass. The lengths of the first glass 1 and the second glass 2 are both 1500 mm, the widths are both 1000 mm, and the thicknesses are both 4 mm. The pulsed laser wavelength of the laser source is 1064 nm, the frequency is 500 kHz, and the welding speed is 10 mm / s. After welding the first glass 1 and the second glass 2 by using the glass welding method of the present invention, the tensile mechanical strength can be 6 MPa.

[0082] The characteristics and advantages of the glass welding method of the present invention are:

[0083] 1. In this glass welding method, the first glass 1 and the second glass 2 are clamped along the edges of the first glass 1 and the second glass 2, so as to form a welding area 5 at a position close to the edges of the first glass 1 and the second glass 2. The welding area 5 can meet the optical contact requirements, so that the gap between the first glass 1 and the second glass 2 corresponding to the welding area 5 can be effectively filled during laser welding, ensuring the stable welding of the first glass 1 and the second glass 2.

[0084] 2. In this glass welding method, before welding the first glass 1 and the second glass 2, the first glass 1 and the second glass 2 are clamped along the edges of the first glass 1 and the second glass 2 by multiple clamps 3, so that the first glass 1 and the second glass 2 are pressed against each other as a whole, thus not changing the warping relationship between the local positions of the first glass 1 and the second glass 2 and the main bodies of the first glass 1 and the second glass 2, and minimizing the negative impact of the self-warping of the glass on laser welding and improving the welding stability of the first glass 1 and the second glass 2.

[0085] Third, the glass welding method can determine the focal position based on the position of the contact surface between the first glass 1 and the second glass 2, and perform laser welding on the first glass 1 and the second glass 2 at the focal position. After completing the laser welding at the focal position, the next focal position is determined and laser welding is performed until at least one circle is welded along the edge of the first glass 1 and the second glass 2 in the welding area. This process involves simultaneous measurement of the focal position and laser welding, thereby improving the efficiency of focal position measurement and achieving high-efficiency welding.

[0086] The above description is merely an illustrative embodiment of the present invention and is not intended to limit the scope of the invention. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of the present invention should fall within the scope of protection of the present invention.

Claims

1. A glass welding method for welding a first glass and a second glass, characterized in that, The method includes the following steps: Step S1: Clamp the first glass and the second glass along their edges to form a welding area near the edges of the first glass and the second glass, the welding area satisfying optical contact requirements; Step S2: Determine the position of the contact surface between the first glass and the second glass at any point in the welding area, and determine the focal point position based on the position of the contact surface between the first glass and the second glass; Step S3: Perform laser welding on the first glass and the second glass at the focal position; Step S4: Determine the next location point along the welding area, and repeat steps S2 to S4 until at least one circle of welding is completed along the edges of the first glass and the second glass. The first glass and the second glass are stacked and placed on top of the raised platform so that the multiple clamps and the welding area are in a suspended position; and any point in the welding area is the starting point of the welding. The focal point is determined according to the position of the contact surface of the first glass and the second glass at the starting point. The first glass and the second glass are laser welded at the focal point, and the measurement of the focal point and the laser welding are performed simultaneously.

2. The glass welding method as described in claim 1, characterized in that, The welding area is an annular region extending along the edges of the first glass and the second glass.

3. The glass welding method as described in claim 2, characterized in that, Multiple clamps are used to clamp along the edges of the first and second glass to make the entire welding area a ring.

4. The glass welding method as described in claim 1, characterized in that, Optical contact requirements include a distance of less than 3 μm between the first glass and the second glass.

5. The glass welding method as described in claim 1, characterized in that, The first glass and the second glass are one or any two of the following: original glass, chemically tempered glass, physically tempered glass, laminated glass, and coated glass.

6. The glass welding method as described in claim 1, characterized in that, Step S2 includes: Step S201: Determine the glass position and the front and back sides of the glass. Of the first glass and the second glass, one is the front glass and the other is the back glass. The laser is incident on the front glass for welding. Step S202: Determine the welding area, taking any point in the welding area as the starting position point; Step S203: Determine the height of the contact surface between the first glass and the second glass at the starting position point; Step S204: Determine the height of the focal point at the starting position point based on the height of the contact surface between the first glass and the second glass at the starting position point.

7. The glass welding method as described in claim 6, characterized in that, The front glass is light-transmitting glass, and the back glass is light-blocking glass.

8. The glass welding method as described in claim 6, characterized in that, In step S201, markings are set on the first glass and / or the second glass to identify the position of the glass and the front and back of the glass.

9. A glass welding apparatus suitable for the glass welding method according to any one of claims 1 to 8, characterized in that, The glass welding apparatus includes: A raised platform for horizontally supporting a first and second glass pane that are stacked on top of it; Multiple clamps are provided for clamping the first glass and the second glass along their edges to form a welding area near the edges of the first glass and the second glass; wherein the multiple clamps and the welding area are located in a suspended position. A light source and a scanning device are provided, wherein the light source and the scanning device are movably disposed above the first glass and the second glass, the light source and the scanning device are used to determine the position of the contact surface between the first glass and the second glass, determine the focal position based on the position of the contact surface between the first glass and the second glass, and perform laser welding at the focal position.

10. The glass welding apparatus as described in claim 9, characterized in that, The glass welding apparatus further includes a support platform, and the raised platform is disposed on top of the support platform. The cross-sectional area of ​​the raised platform is smaller than the annular area enclosed by the welding area.

11. The glass welding apparatus as described in claim 9, characterized in that, The light source and scanning device include at least a laser light source and a scanner. The scanner is used to obtain the height of the contact surface between the first glass and the second glass at any point in the welding area. The laser light source is used to perform laser welding on the first glass and the second glass at the focal point.

12. The glass welding apparatus as described in claim 9, characterized in that, The glass welding apparatus further includes an image acquisition device, which is used to identify the position of the glass and the front and back sides of the glass based on the markings set on the first glass and / or the second glass.

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