laser

Abstract

A laser (10) belongs to the field of optoelectronic technology. The laser (10) includes: a housing (101) with an opening on one side; multiple light-emitting components (102) located in the accommodating space of the housing (101); a ring-shaped sealing cover (103); a light-transmitting sealing layer (104) with its edge fixed to the sealing cover (103); and a collimating lens group (105) located on the side of the sealing cover (103) away from the housing (101), with its edge fixed to the sealing cover (103) by an adhesive.

Description

[0001] Cross-references to related applications

[0002] This application claims priority to Chinese patent applications filed on August 27, 2020, with application numbers 202010878802.8, 202010880212.9, and 202010878774.X, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of optoelectronic technology, and in particular to a laser. Background Technology

[0004] With the development of optoelectronic technology, lasers are being widely used.

[0005] During parallel welding of the sealing cover plate and the side wall of the tube shell, a significant amount of heat is generated at the connection point. This thermal expansion of the sealing cover plate and the side wall generates substantial stress, which is then transferred through the sealing cover plate to the light-transmitting sealing layer, making it more prone to cracking. Consequently, the yield rate of laser fabrication is low. Summary of the Invention

[0006] Some embodiments of this application provide a laser, including a housing with an opening on one side; a plurality of light-emitting components located within an accommodating space of the housing; a sealing cover plate, the sealing cover plate being annular, the sealing cover plate including an inner edge portion and an outer edge portion, and a transition structure connecting the inner edge portion and the outer edge portion, the outer edge portion being fixed to the side of the housing with the opening; the transition structure including a first portion and a second portion arranged sequentially in a direction away from the inner edge portion; a light-transmitting sealing layer, the edge of the light-transmitting sealing layer being fixed to the inner edge portion; and a collimating lens assembly located on the side of the sealing cover plate away from the housing, the edge of the collimating lens assembly being bonded to the sealing cover plate by an adhesive. Attached Figure Description

[0007] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0008] Figure 1 This is a schematic diagram of the structure of a laser provided by related technologies;

[0009] Figure 2 This is a schematic diagram of the structure of a laser provided in some embodiments of this application;

[0010] Figure 3 This is a schematic diagram of another laser structure provided by some embodiments of this application;

[0011] Figure 4 This is a schematic diagram of another laser structure provided in some embodiments of this application;

[0012] Figure 5 This is a schematic diagram of the structure of a laser provided in some embodiments of this application;

[0013] Figure 6 This is a schematic diagram of another laser structure provided by some embodiments of this application;

[0014] Figure 7 This is a schematic diagram of another laser structure provided in some embodiments of this application;

[0015] Figure 8 This is a schematic diagram of the structure of a sealing cover provided in one embodiment of this application;

[0016] Figure 9 This is a schematic diagram of the structure of another sealing cover provided in some embodiments of this application;

[0017] Figure 10 This is a schematic diagram of another laser structure provided in some embodiments of this application;

[0018] Figure 11 This is a schematic diagram of the structure of a laser provided in some embodiments of this application;

[0019] Figure 12 This is an exploded view of a laser provided in some embodiments of this application;

[0020] Figure 13 This is an exploded structural diagram of a shell provided in some embodiments of this application;

[0021] Figure 14 This is an exploded structural diagram of another tubular shell provided by some embodiments of this application;

[0022] Figure 15 This is a schematic diagram of another laser structure provided in some embodiments of this application. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0024] With the development of optoelectronic technology, lasers are being used more and more widely, for example in welding, cutting, and laser projection. This application provides a laser that can improve the bonding strength of the collimating lens assembly and enhance the reliability of the laser.

[0025] In related technologies, such as Figure 1 As shown, the laser 00 includes a housing 001, multiple light-emitting components 002, a sealing cover 003, a light-transmitting sealing layer 004, and a collimating lens assembly 005. One side of the housing 001 has an opening, and the multiple light-emitting components 002 are located within the housing 001's accommodating space. The sealing cover 003 is an annular sheet metal component with its inner edge recessed into the housing 001, and its outer edge is welded to the side of the housing where the opening is located. The edge of the light-transmitting sealing layer 004 is fixed to the inner edge of the sealing cover 003. The collimating lens assembly 005 is located on the side of the sealing cover 003 away from the housing 001, and the opposite edges of the collimating lens assembly 005 are bonded to the outer edges of the sealing cover 003 using adhesive.

[0026] However, the bonding strength of the collimating lens assembly in the related technology is relatively low, and the collimating lens assembly is more likely to fall off the sealing cover plate, resulting in poor reliability of the laser.

[0027] Figures 2 to 4 A schematic diagram of the structure of a laser is provided for some embodiments of this application, such as... Figure 2 As shown, the laser 10 includes: a housing 101, multiple light-emitting components 102, a sealing cover 103, a light-transmitting sealing layer 104, and a collimating lens group 105.

[0028] The housing 101 has an opening on one side, and multiple light-emitting components 102 are located within the housing 101's accommodating space. The sealing cover 103 is annular and includes an inner edge portion W1 and an outer edge portion W2, as well as a transition structure W3 connecting the inner edge portion W1 and the outer edge portion W2. The outer edge portion W2 is fixed to the side of the housing 101 where the opening is located. The transition structure W3 includes a first portion B1 and a second portion B2 arranged sequentially along a direction away from the inner edge portion W1. It should be noted that the direction away from the inner edge portion is the direction from the inner edge portion to the outer edge portion, that is, from the central hollow area of ​​the sealing cover 103 to the surrounding edges. The edge of the light-transmitting sealing layer 104 is fixed to the inner edge portion W1. The collimating lens assembly 105 is located on the side of the sealing cover 103 away from the housing 101. The edge of the collimating lens 105 is bonded to the sealing cover 103 by adhesive X, exemplarily bonded to the outer edge portion W2 of the sealing cover 103, and bonded to the first portion B1 by adhesive X. The adhesive X on the outer edge portion W2 and the adhesive X on the first portion B1 form a gap on the second portion B2. For example, no adhesive may be provided between the second portion B2 and the collimating lens assembly 105. In one possible embodiment, the adhesive includes glass melt, low-temperature glass solder, epoxy resin, or other adhesives. In one possible embodiment, the edge of the collimating lens 105 is bonded to the outer edge portion W2 by adhesive X, and the edge of the collimating lens 105 is not bonded to the first portion B1 or other portions. However, it should be noted that it is understandable that some adhesive may leak into other portions due to operational precision or other reasons.

[0029] In this embodiment, the collimating lens assembly 105 is supported by the outer edge portion W2 of the sealing cover plate 103 and the first portion B1 of the transition structure W3, and the collimating lens assembly 105 is fixed by the adhesive on the outer edge portion W2 and the first portion B1. The collimating lens assembly 105 has a large bonding area and many support points, and the bonding firmness of the collimating lens assembly 105 is high, which reduces the risk of the collimating lens assembly 105 falling off the sealing cover plate 103 and improves the reliability of the laser.

[0030] In this embodiment, the light-emitting component 102 generates a large amount of heat during operation. This heat can be transferred through the housing 101 to the sealing cover 103, and also through the sealing cover 103 to the light-transmitting sealing layer 104 and the collimating lens assembly 105. Under the influence of this heat, the housing 101 and the sealing cover 103 will expand, resulting in significant stress. In this embodiment, there is a gap between the adhesive on the outer edge portion W2 of the sealing cover 103 and the adhesive on the first portion B1 of the transition structure W3. This ensures that the stress is released to some extent during transmission, thereby reducing the stress transmitted to the light-transmitting sealing layer 104 and the collimating lens assembly 105, and reducing the risk of the light-transmitting sealing layer 104 and the collimating lens assembly 105 cracking or detaching under this stress.

[0031] In summary, in the laser provided by some embodiments of this application, the transition structure connecting the inner edge and the outer edge in the sealing cover includes a first part and a second part, and the edge of the collimating lens group is bonded to the outer edge part and the first part by an adhesive. This can ensure that the bonding area between the collimating lens and the sealing cover is large, thereby improving the bonding firmness of the collimating lens group and improving the reliability of the laser.

[0032] In addition, the adhesive on the outer edge and the adhesive on the first part can form a gap in the second part. This can prevent the stress generated when the tube shell and the sealing cover are heated and expanded through the adhesive from being continuously transmitted. The stress can be released to a certain extent in the gap, reducing the impact of stress on the light-transmitting sealing layer and the collimating lens group.

[0033] In the embodiments of this application, such as Figure 2 As shown, the casing 101 includes a base plate 1011 and an annular sidewall portion 1012 fixed to the base plate 1011. The base plate 1011 and the sidewall portion 1012 enclose the accommodating space of the casing 101. The opening in the sidewall portion 1012 away from the base plate 1011 is the opening of the casing 101. In one possible embodiment, the base plate 1011 and the sidewall portion 1012 in the casing 101 are an integral structure or separate structures, formed by welding them together to form the casing 101.

[0034] In one possible implementation, the thickness of the outer edge portion W2 of the sealing cover 103 is less than a preset thickness threshold, and the outer edge portion W2 is relatively thin. The outer edge portion W2 can be fixed to the side of the opening of the tube shell 101 by parallel sealing welding technology. For example, the outer edge portion W2 of the sealing cover 103 can be fixed to the surface of the side wall portion 1012 away from the bottom plate 1011 by parallel sealing welding technology. In one possible implementation, the sealing cover 103 is a sheet metal part, and the thickness of the sealing cover 103 is the same or approximately the same at all positions. In one possible implementation, the sealing cover 103 is made by sheet metal processing, such as stamping a ring-shaped plate structure, so that appropriate positions in the plate structure are bent, recessed, or protruded to obtain the sealing cover provided in the embodiments of this application.

[0035] In this embodiment, the outer edge portion W2 of the sealing cover 103 is an annular plate structure. The width of the outer edge portion W2 can be wider than the width of the sidewall portion 1012 away from the bottom plate 1011, and the difference between the width of the outer edge portion W2 and the width of the sidewall portion 1012 away from the bottom plate 1011 can be less than a set threshold, that is, the width of the outer edge portion W2 can be slightly wider than the width of the sidewall portion 1012 away from the bottom plate 1011. It should be noted that the width of any annular structure mentioned in this embodiment refers to the ring width. In one possible implementation, the outer annular surface of the outer edge portion W2 is flush with the outer annular surface of the sidewall portion 1012, or the outer annular surface of the outer edge portion W2 is retracted relative to the outer annular surface of the sidewall portion 1012. For example, the distance between the outer annular surface of the outer edge portion and the outer annular surface of the sidewall portion is less than 0.1 mm. Because the surface in the sealing welding equipment that comes into contact with the object being welded is an inclined plane, and the outer ring surface of the outer edge portion is retracted relative to the outer ring surface of the side wall portion, it can be ensured that the inclined plane of the sealing welding equipment can simultaneously contact the surfaces of the outer edge portion and the side wall portion that are far from the base plate, thereby allowing both the outer edge portion and the side wall portion to melt, resulting in a better parallel sealing welding effect.

[0036] In some embodiments of this application, the light-transmitting sealing layer 104 has a plate-like structure. This plate-like structure includes two parallel, larger surfaces and a plurality of smaller side surfaces connecting the two surfaces. The side surfaces of the light-transmitting sealing layer 104 are sealed with a sealant (…). Figure 2(Not shown in the diagram) is fixed to the inner edge portion W1 of the sealing cover plate 103. In some embodiments of this application, the light-transmitting sealing layer is directly fixed to the sealing cover plate, or in other possible embodiments, the laser also includes a support frame, to which the light-transmitting sealing layer can be fixed first, and then the support frame can be fixed to the sealing cover plate. For example, the support frame is a U-shaped frame, so that the middle area of ​​the light-transmitting sealing layer can be supported by the support frame, thereby improving the firmness of the light-transmitting sealing layer. In some possible embodiments, at least one of the surfaces of the light-transmitting sealing layer near the base plate and the surface away from the base plate is attached with a brightness enhancement film to improve the output brightness of the laser.

[0037] The housing 101, the sealing cover 103, and the light-transmitting sealing layer 104 constitute a sealed space, thereby placing the light-emitting component 102 within the sealed space and preventing water and oxygen from corroding the light-emitting component 102. Furthermore, this arrangement reduces the risk of the light-transmitting sealing layer 104 cracking due to the heat generated during the operation of the light-emitting component 102, thus ensuring the sealing effect of the sealed space and extending the lifespan of the light-emitting component.

[0038] Continue to refer to Figure 2 The light-emitting component 102 includes a light-emitting chip 1021, a heat sink 1022, and a reflecting prism 1023. The heat sink 1022 is disposed on the base plate 1011 of the housing 101, and the light-emitting chip 1021 is disposed on the heat sink 1022. The heat sink 1022 assists in heat dissipation of the light-emitting chip 1021. The reflecting prism 1023 is located on the light-emitting side of the light-emitting chip 1021. Light emitted by the light-emitting chip 1021 is directed towards the reflecting prism 1023 and reflected to pass through the light-transmitting sealing layer 104 before exiting. For example, multiple light-emitting chips may emit light of the same color, or different light-emitting chips may emit light of different colors; this embodiment is not limited to this. In one possible implementation, the light emitted by the light-emitting chip is laser light. The heat generated by the light-emitting component 102 is the heat generated by the light-emitting chip when it is working. The heat is transferred to the base plate 1011 through the heat sink, and then conducted to the sealing cover plate 103 through the side wall portion 1012 of the housing 101.

[0039] In some embodiments of this application, the collimating lens group 105 is used to collimate and emit light emitted by the light-emitting component (such as light reflected by the reflecting prism in the light-emitting component). It should be noted that collimating the light is equivalent to converging the light, reducing the divergence angle and making it closer to parallel light. In one possible implementation, the collimating lens group 105 includes multiple collimating lenses, each corresponding to one of the multiple light-emitting components 102 in the laser. Light emitted by each light-emitting component is directed towards its corresponding collimating lens and then collimated before being emitted.

[0040] In one possible embodiment, such as Figure 2 As shown, the collimating lens group 105 has multiple collimating lenses integrally formed. The side of the collimating lens group 105 away from the base plate 1011 of the housing 101 has multiple convex arc surfaces curved away from the base plate 1011. Each convex arc surface serves as a collimating lens, thus the collimating lens group can be considered to include multiple collimating lenses. In one possible embodiment, the collimating lens is a plano-convex lens with a convex arc surface and a plane. The convex arc surface and the plane are two opposing surfaces. The plane is parallel to the base plate 1011 and is positioned close to the base plate 1011. Each convex arc surface of the collimating lens group 105 is a convex arc surface within a collimating lens. In one possible embodiment, in some embodiments of this application, the radius of curvature of the collimating lens in the collimating lens group (i.e., the radius of curvature of the convex arc surface in the collimating lens) can range from 1 mm to 4.5 mm.

[0041] In one possible implementation, the laser's multiple light-emitting components include multiple rows and columns of light-emitting chips arranged in an array on the base plate of the housing. The distance between adjacent light-emitting chips in a first direction ranges from 2 to 4 millimeters, exemplarily 3 millimeters, and the first direction can be the light-emitting direction of the chips. In a second direction perpendicular to the first direction, the distance between adjacent light-emitting chips can range from 3 to 6 millimeters, exemplarily 4 millimeters.

[0042] In some embodiments of this application, the shell material is copper, such as oxygen-free copper, the transparent sealing layer material can be glass, and the sealing cover material is stainless steel. Since the coefficient of thermal expansion of stainless steel is greater than that of glass and less than that of oxygen-free copper, the difference in coefficients of thermal expansion between the various connected components is small. This can appropriately alleviate the stress transmitted to the sealing cover and sealing glass due to the thermal expansion of the oxygen-free copper shell, further improving the laser fabrication yield.

[0043] It should be noted that copper has a high thermal conductivity. In this embodiment, the casing is made of copper. This ensures that the heat generated by the light-emitting component mounted on the bottom plate of the casing during operation can be quickly conducted through the casing and dissipated, preventing heat accumulation and damage to the light-emitting component. In one possible implementation, the casing is made of one or more of aluminum, aluminum nitride, and silicon carbide. The sealing cover in this embodiment can also be made of other Kovar materials, such as iron-nickel-cobalt alloys or other alloys. The light-transmitting sealing layer can also be made of other light-transmitting and reliable materials, such as resin materials.

[0044] In this embodiment, when fixing the outer edge portion W2 of the sealing cover plate 103 to the tube shell 101 using parallel sealing welding technology, the sealing cover plate 103 is first placed on the side where the opening of the tube shell 101 is located, and the outer edge portion W2 of the sealing cover plate 103 overlaps the surface of the side wall portion 1012 of the tube shell 101 away from the bottom plate 1011. Then, the outer edge portion W2 needs to be heated using sealing welding equipment to melt the connection between the outer edge portion and the side wall portion 1012, thereby welding the outer edge portion W2 to the side wall portion of the tube shell 101 together. In one possible implementation, before fixing the sealing cover plate 103 to the tube shell 101, the light-transmitting sealing layer 104 is first fixed to the sealing cover plate 103, for example, by using an adhesive to fix the edge of the light-transmitting sealing layer 104 to the inner edge portion W1 of the sealing cover plate 103. The adhesive can cover the side surface of the light-transmitting sealing layer 104 to ensure reliable adhesion of the light-transmitting sealing layer. After fixing the sealing cover 103 to the housing 101, the collimating lens assembly 105 can be suspended in the air to adjust the collimation effect. After adjusting and determining the position of the collimating lens assembly 105, adhesive is applied to the outer edge W2 and the first part B1 of the sealing cover 103, and then the collimating lens assembly 105 is fixed to the sealing cover 103 by the adhesive.

[0045] In some embodiments of this application, the first portion B1 and the second portion B2 of the transition structure W3 in the sealing cover plate 103 are both annular, and the adhesive on the first portion B1 is annular, meaning that adhesive can be applied to all positions on the first portion B1. The adhesive on the outer edge portion can also be annular. In related technologies, collimating lens assemblies are typically bonded to the sealing cover plate only at their opposite edges using adhesive, resulting in poor bonding strength. In the embodiments of this application, the adhesive on both the outer edge portion and the first portion can be annular, which can further increase the bonding area of ​​the collimating lens assembly 105 and ensure the bonding strength of the collimating lens assembly 105.

[0046] In one possible implementation, the adhesive on only one of the outer edge portion and the first portion may be annular, while the adhesive on the other portion may be strip-shaped, such as adhesive being applied to opposite sides of the other portion, or adhesive being applied to any three sides. In another possible implementation, the outer edge portion is coated with adhesive only on opposite sides, and the first portion is also coated with adhesive only on opposite sides, such as the adhesive on both the outer edge portion and the first portion being strip-shaped. See also Figure 3 and Figure 4The adhesive is applied to only two opposite sides of the outer edge portion, and the adhesive on the outer edge portion is in the form of strips. In one possible embodiment, the two sides of the outer edge portion coated with adhesive are the two sides of the outer edge portion in a first direction, and the two sides of the first portion coated with adhesive are also the two sides of the first portion in the first direction; or, the two sides of the outer edge portion coated with adhesive are the two sides of the outer edge portion in the first direction, and the two sides of the first portion coated with adhesive are the two sides of the first portion in a second direction, wherein the first direction may be perpendicular to the second direction. In one possible embodiment, the adhesive on the outer edge portion and the first portion may also be applied by dot coating, such as the adhesive on the outer edge portion and the first portion may include multiple adhesive blocks, which may be evenly distributed in various areas of the outer edge portion and the first portion, or may be distributed only in certain areas of the outer edge portion and the first portion, such as only on the opposite sides of the outer edge portion and the first portion. In addition, the application position of the adhesive on the outer edge portion and the first portion can be flexibly changed according to actual needs. In this embodiment, the application position of the adhesive on the outer edge portion and the first portion is not limited.

[0047] It should be noted that, Figure 3 and Figure 4 Taking the collimating lens group covering only the opposite sides of the outer edge portion and the opposite sides of the first portion as an example, and further taking the opposite sides of the outer edge portion covered only by the collimating lens group as an example, and the opposite sides of the first portion covered only by the collimating lens group as an example.

[0048] In one possible implementation, neither the first nor the second part is annular, or one of the first and second parts is annular while the other is not. Taking the non-annular first part as an example: For instance, the first part includes two strip-shaped structures located on opposite or adjacent sides of the inner edge portion; or the first part has three strip-shaped structures located on any three sides of the inner edge portion. These two or three strip-shaped structures may or may not be connected; this application does not limit the specific form. The non-annular form of the second part can be referred to the corresponding description of the first part. This application does not limit the non-annular form.

[0049] In some embodiments of this application, the shapes of all the annular structures in the laser can be identical. For example, the shape of each annular structure can be designed based on the shape of the sidewall portion of the housing. If the sidewall portion is square annular, then the sealing cover is also square annular, and both the outer and inner edges of the sealing cover are square annular. In one possible embodiment, the first and second parts of the transition structure are also square annular. If the annular structure of the sidewall portion is circular, then the shapes of the other annular structures are also circular. In one possible embodiment, the shapes of the annular structures in the laser can also be other annular shapes. This application does not limit the shapes, and the following embodiments are illustrated using the example of all annular structures being square annular.

[0050] Please continue to refer to this. Figure 2 In the sealing cover 103, the surface of the first portion B1 of the transition structure W3, away from the casing 101, can protrude outward from the casing 101 relative to the outer edge portion W2. For example, the distance between the surface of the first portion away from the casing 101 and the plane containing the outer edge portion W2 is less than 0.5 mm. In one possible implementation, the surface of the first portion B1 away from the casing 101 can also be flush with the outer edge portion W2 to facilitate the application of adhesive to the first portion B1. It should be noted that in this embodiment, structure A is recessed inward from the casing 101 relative to structure B, meaning the distance between structure A and the base plate 1011 is less than the distance between structure B and the base plate 1011; structure A protrudes outward from the casing 101 relative to structure B, meaning the distance between structure A and the base plate 1011 is greater than the distance between structure B and the base plate 1011.

[0051] In one possible implementation, the width of the first portion B1 is smaller than the width of the outer edge portion W2. In this case, the surface of the first portion B1 away from the housing 101 protrudes outward from the housing 101 relative to the outer edge portion W2. This results in a smaller distance between the first portion B1 and the collimating lens assembly 105, allowing for bonding of the first portion B1 to the collimating lens assembly 105 with only a smaller amount of adhesive. This avoids the situation where a larger distance between the first portion and the collimating lens assembly would require a larger amount of adhesive to be applied to the first portion B1, thus preventing adhesive from flowing out of the narrower first portion.

[0052] In one possible implementation, such as Figure 2As shown, adhesive can be applied only to the outermost area of ​​the outer edge portion W2 to ensure that the adhesive on the outer edge portion can cover the sides of the collimating lens assembly, thereby further ensuring the bonding strength of the collimating lens assembly. Furthermore, adhesive can be applied only to the middle area of ​​the first portion B1 to prevent adhesive from flowing to areas outside the outer edge portion W2 and the first portion B1. In one possible implementation, adhesive can also be applied to the entire width of both the outer edge portion and the first portion; this embodiment is not limited to this.

[0053] The structure of the sealing cover plate 103 is described in detail below:

[0054] Please continue to refer to this. Figure 2 In the transition structure W3 of the sealing cover plate 103, the first part B1 protrudes outward from the inner edge of the tube shell 101, while the second part B2 is recessed inward from the first part B1. This ensures that the transition structure W3 has multiple bends. When the tube shell 101 and the sealing cover plate 103 expand due to heat, each bend in the transition structure W3 deforms along its bending direction to absorb some stress and reduce the stress transmitted from the sealing cover plate 103 to the light-transmitting sealing layer 104 and the collimating lens assembly 105. In one possible embodiment, each bend in the transition structure W3 may have a chamfer or rounded corner to avoid excessive stress concentration at the bend.

[0055] Furthermore, when fixing the sealing cover 103 to the light-transmitting sealing layer 104, it is necessary to first apply sealant to the inner edge portion W1 of the sealing cover 103, so that the light-transmitting sealing layer 104 covers the inner edge portion W1, and the edge of the light-transmitting sealing layer 104 is in close contact with the sealant. The first part B1 connects to the inner edge portion, and the first part B1 protrudes outward from the tube shell 101 relative to the inner edge portion W1. The height difference between the first part B1 and the inner edge portion W1 can ensure that the sealant is only located on the inner edge portion W1, preventing the sealant from flowing to other locations.

[0056] Please continue to refer to this. Figure 2 The second part B2 is recessed into the casing 101 relative to the outer edge part W2. Since the sealing equipment needs to contact the outer edge part W2 during parallel sealing, the proximity of the second part B2 to the outer edge part W2 ensures that the second part W2 is far away from the sealing equipment during parallel sealing, avoiding the influence or damage of the sealing equipment on the second part W2.

[0057] Please continue to refer to this. Figure 2The second portion B2 protrudes outward from the inner edge portion W1 relative to the housing 101. In one possible embodiment, the second portion B2 may also be recessed inward from the inner edge portion relative to the housing; this method is not illustrated in the embodiments of the application. The recessed second portion relative to the inner edge portion ensures a longer unfolded length of the transition region, further improving the heat dissipation effect of the transition region. Furthermore, the surface of the second portion near the base plate is farther from the surface of the first portion near the collimating lens assembly, making the connection between the first and second portions more prone to deformation and more effectively absorbing stress.

[0058] It should be noted that during parallel sealing welding of the sealing cover and the housing, the connection point between the sealing cover and the housing is subjected to significant heat. This heat has the same effect on the sealing cover and housing as the heat generated during the operation of the light-emitting chip, resulting in substantial stress on both. In this embodiment, because the transition structure of the sealing cover has numerous bends, these bends deform in the bending direction under the heat generated during parallel sealing welding. This absorbs the stress generated between the sealing cover and the housing, reducing the stress transmitted to the light-transmitting sealing layer and lowering the risk of cracking or detachment of the light-transmitting sealing layer during parallel sealing welding. Furthermore, the bends in this transition structure can also absorb the stress generated by the heat from the light-emitting chip during operation, further reducing the risk of cracking or detachment of the light-transmitting sealing layer and the collimating lens assembly. When the sealing cover is no longer heated, the temperature of the housing and the sealing cover can decrease, allowing the transition structure of the sealing cover to return to its original state.

[0059] Furthermore, even if the transition structure expands due to heat in this embodiment, the deformation of the transition structure towards the light-transmitting sealing layer can be minimized because the various bends of the transition structure can deform. Moreover, due to the large unfolded area of ​​the transition structure, more heat received by the sealing cover can be absorbed and dissipated by the transition structure, reducing the heat transferred to the light-transmitting sealing layer, decreasing the deformation of the light-transmitting sealing layer due to thermal expansion, and reducing the risk of the light-transmitting sealing layer cracking or detaching from the sealing cover. Furthermore, because the transition structure can absorb more stress, it can improve the limit of stress damage to the sealing cover, greatly enhancing the adaptability of the sealing cover and the light-transmitting sealing layer to higher parallel sealing temperatures, reducing the requirements for laser fabrication conditions, and also lowering the requirements for the laser's operating environment, thus expanding the applicable range of the laser.

[0060] Please continue to refer to this. Figure 2In the transition area W3 of the sealing cover plate 103, the first part B1 connects to the inner edge part W1, and the second part B2 connects to the outer edge part W2. The first part can be a rectangular structure (or an n-shaped structure). The first part B1 includes a first connecting part L1, a second connecting part L2, and a third connecting part L3 connected in sequence. The second part B2 includes a fourth connecting part L4 and a fifth connecting part L5 connected in sequence. Among them, the first connecting part L1, the third connecting part L3, and the fifth connecting part L5 are all first annular structures. The second connecting part L2 and the fourth connecting part L4 are both second annular structures. The thickness of the first annular structure is greater than the thickness of the second annular structure, and the width of the first annular structure is smaller than the width of the second annular structure. The first annular structure has a first opening edge near the inside of the tube shell and a second opening edge near the outside of the tube shell. The second annular structure has an inner edge and an outer edge. In this application embodiment, the thickness of the annular structure refers to the distance between the two connected openings of the annular structure. If the annular structure is considered as a relatively short tubular structure, then the thickness of the annular structure refers to the length of the tubular structure, and the width of the annular structure refers to the thickness of the tubular structure's wall. In this application embodiment, the first annular structure is similar to a structure formed by connecting the two ends of a strip-shaped plate structure, and the second annular structure is similar to a structure formed by hollowing out the middle of a plate structure.

[0061] The first opening edge of the first connecting part L1 is connected to the inner edge part W1, the second opening edge of the first connecting part L1 is connected to the inner edge of the second connecting part L2, the outer edge of the second connecting part L2 is connected to the second opening edge of the third connecting part L3, the first opening edge of the third connecting part L3 is connected to the inner edge of the fourth connecting part L4, the outer edge of the fourth connecting part L4 is connected to the first opening edge of the fifth connecting part L5, and the second opening edge of the fifth connecting part L5 is connected to the outer edge part W2.

[0062] In some embodiments of this application, the inner edge portion W1, the outer edge portion W2, and the second annular structure (such as the second connecting portion and the fourth connecting portion) are all flat-surfaced annular plate-like structures. At least one of the first connecting portion L1, the third connecting portion L3, and the fifth connecting portion L5 is perpendicular to the plane where the outer edge portion W2 is located. This application embodiment uses the example where the first connecting portion L1, the third connecting portion L3, and the fifth connecting portion L5 are all perpendicular to the plane where the outer edge portion W2 is located, that is, the first annular structure is perpendicular to the plane where the outer edge portion W2 is located. In one possible implementation, in this application embodiment, the plane where the inner edge portion W1 is located is parallel to the plane where the outer edge portion W2 is located, therefore at least one connecting portion is perpendicular to the plane where the inner edge portion W1 is located. In one possible implementation, both the plane where the inner edge portion W1 is located and the plane where the outer edge portion W2 is located are parallel to the base plate, and the plane where the second annular structure is located is parallel to the plane where the outer edge portion W2 is located.

[0063] For example, in the embodiments of this application, each annular structure is a square ring. The first annular structure can be considered as consisting of four sidewalls connected in sequence, each sidewall being perpendicular to the plane containing the outer edge portion W2. For example, if the angle between the sidewall of the first annular structure and the second annular structure it connects to is a right angle, this type of sidewall can be called a vertical wall. In one possible implementation, the first annular structure may not be perpendicular to the plane containing the outer edge portion W2. In this case, each sidewall of the first annular structure is not perpendicular to the plane containing the outer edge portion W2. For example, the angle between the sidewall of the first annular structure and the second annular structure it connects to can be an acute angle or an obtuse angle. This type of sidewall can be called an inclined wall.

[0064] In one possible implementation, in this embodiment of the application, the height range of the first connecting portion L1, the third connecting portion L3, and the fifth connecting portion L5 in the direction perpendicular to the plane where the outer edge portion W2 is located is 1 mm to 6 mm, that is, the height range of each sidewall of the connecting portion is 1 mm to 6 mm, and the thickness range of the first annular structure in the sealing cover is set to 1 mm to 6 mm. Since the overall thickness of the laser is usually less than 1 cm, and the distance between the base plate and the collimating lens group is less than 6 mm, the thickness range of the first annular structure in the sealing cover is set to 1 mm to 6 mm to ensure that the sealing cover is compatible with the size of the laser.

[0065] It should be noted that the above embodiments of this application are all explained using the example of a transition structure of a sealing cover plate including a first part and a second part. In one possible implementation, the transition structure may also include multiple first parts and multiple second parts, and the first part and the second part may be arranged alternately between the inner edge part and the outer edge part. In this case, the first part and the second part can both refer to the above description of the first part and the second part, and the embodiments of this application will not repeat them.

[0066] Please refer to Figure 3 and Figure 4 The sidewall portion 1012 of the housing 101 has multiple openings on opposite sides. The laser 10 also includes multiple conductive pins 106, which extend through the openings in the sidewall portion 101 into the housing 101 and are thus fixed to the housing 101. The conductive pins 106 are electrically connected to the electrodes of the light-emitting chip in the light-emitting component 102 to transmit external power to the light-emitting chip, thereby exciting the light-emitting chip to emit light. In one possible embodiment, the aperture of the opening is 1.2 mm, and the diameter of the conductive pin 106 is 0.55 mm.

[0067] In one possible implementation, some embodiments of this application, when assembling the laser, can first place an annular solder structure (such as an annular glass bead) in an opening on the sidewall portion of the housing, and pass conductive leads through the solder structure and the opening containing the solder structure. Then, the sidewall portion is placed around the perimeter of the base plate, and an annular silver-copper solder is placed between the base plate and the housing. Next, the structure of the base plate, sidewall portion, and conductive leads is placed in a high-temperature furnace for sealing sintering. After sealing sintering and curing, the base plate, sidewall portion, conductive leads, and solder become a whole, thereby achieving an airtight seal at the opening of the sidewall portion. Alternatively, the light-transmitting sealing layer can be fixed to the sealing cover plate, such as by attaching the edge of the light-transmitting sealing layer to the inner edge of the sealing cover plate, to obtain the upper cover assembly. Then, the light-emitting component can be welded to the base plate within the housing space of the housing, and then the upper cover assembly is welded to the surface of the sidewall portion of the housing away from the base plate using parallel sealing welding technology. Finally, the collimating lens assembly is fixed to the side of the upper cover assembly away from the base plate with epoxy adhesive, thus completing the assembly of the laser. It should be noted that the above assembly process is only an exemplary process provided by the embodiments of this application. The welding process used in each step can be replaced by other processes, and the order of each step can also be adjusted. The embodiments of this application do not limit this.

[0068] It should be noted that the above embodiments of this application are all described using the bottom plate and side wall of the tube shell as two separate structures to be assembled. In one possible implementation, the bottom plate and side wall can also be integrally formed. This can avoid wrinkles on the bottom plate caused by the difference in thermal expansion coefficients between the bottom plate and side wall during high-temperature welding, thereby ensuring the flatness of the bottom plate, ensuring the reliability of the light-emitting component on the bottom plate, and ensuring that the light emitted by the light-emitting chip is emitted at a predetermined emission angle, thus improving the light-emitting effect of the laser.

[0069] In summary, in the laser provided by the above embodiments of this application, the transition structure connecting the inner edge and the outer edge in the sealing cover plate may include a first part and a second part, and the edge of the collimating lens group can be bonded to the outer edge part and the first part by an adhesive. This can ensure that the bonding area between the collimating lens and the sealing cover plate is large, thereby improving the bonding firmness of the collimating lens group and improving the reliability of the laser.

[0070] In addition, the adhesive on the outer edge and the adhesive on the first part can form a gap in the second part. This can prevent the stress generated when the tube shell and the sealing cover are heated and expanded through the adhesive from being continuously transmitted. The stress can be released to a certain extent in the gap, reducing the impact of stress on the light-transmitting sealing layer and the collimating lens group.

[0071] Figures 5 to 10A schematic diagram of a laser provided for some other embodiments of this application.

[0072] like Figure 5 As shown, the laser 10 includes: a housing 101, multiple light-emitting components 102, a sealing cover 103, and a light-transmitting sealing layer 104.

[0073] The housing 101 has an opening on one side, and multiple light-emitting components 102 are located within the housing 101's accommodating space. The sealing cover 103 is annular and includes an inner edge portion W1 and an outer edge portion W2, as well as a transition structure W3 connecting the inner edge portion W1 and the outer edge portion W2. The waveform of the transition structure W3 extends from the outer edge portion W2 toward the inner edge portion W1, and the outer edge portion W2 is fixed to the side where the opening of the housing 101 is located. The edge of the light-transmitting sealing layer 104 is fixed to the inner edge portion W1.

[0074] In other embodiments of this application, the thickness of the outer edge portion W2 of the sealing cover 103 may be less than a preset thickness threshold, and the outer edge portion W2 is relatively thin. The outer edge portion W2 can be fixed to the side where the opening of the tube shell 101 is located by parallel sealing welding technology. In one possible embodiment, the sealing cover 103 is a sheet metal part, and the thickness of the sealing cover 103 is the same or approximately the same at all positions. The sealing cover 103 can be manufactured by sheet metal processing, such as stamping a ring-shaped plate structure, so that appropriate positions in the plate structure are bent, recessed, or protruded to obtain the sealing cover provided in the embodiments of this application.

[0075] The shell 101 includes a base plate 1011 and an annular sidewall portion 1012 fixed to the base plate 1011. The base plate 1011 and the sidewall portion 1012 enclose a receiving space for the shell 101. In other embodiments provided in this application, the structure, function, and materials of the shell 101 can be referred to the relevant content described above, and will not be repeated here.

[0076] During parallel sealing welding, the casing 101 and the sealing cover 103 will expand due to heat, resulting in significant stress. Under this stress, the transition structure W3 in the sealing cover 103 is essentially compressed by the inner edge portion W1 and the outer edge portion W2. Consequently, the transition structure W3 acts like a compression spring, undergoing contraction deformation. This allows the transition structure W3 to absorb a significant amount of stress, providing a buffering effect and reducing the stress transmitted to the light-transmitting sealing layer 104. Even if the sealing cover 103 expands due to heat and deforms towards the light-transmitting sealing layer 104, the transition structure W3 can contract to some extent under the force generated by heat. Therefore, the deformation of the sealing cover 103 towards the light-transmitting sealing layer 104 is small, resulting in less compression of the light-transmitting sealing layer 104 and reducing the risk of rupture of the light-transmitting sealing layer. Furthermore, because the transition structure can absorb more stress, it can improve the limit of stress damage to the sealing cover, greatly enhance the adaptability of the sealing cover and the light-transmitting sealing layer to the higher parallel sealing temperature, reduce the requirements for laser fabrication conditions, and also lower the requirements for the laser's operating environment, thus expanding the laser's application range. When the parallel sealing is completed and the sealing cover is no longer heated, the temperature of the tube shell and the sealing cover can drop, and the transition structure can then return to its original shape (i.e., the shape when not compressed by the inner edge portion W1 and the outer edge portion W2, equivalent to the free height of a compression spring).

[0077] In summary, in the lasers provided by other embodiments of this application, the stress generated by the housing and sealing cover when heated can cause a certain degree of shrinkage deformation in the transition structure. Therefore, the sealing cover can absorb more stress, resulting in less stress transmitted from the sealing cover to the light-transmitting sealing layer. Furthermore, even if the transition structure expands due to heat, the deformation of the transition structure towards the light-transmitting sealing layer can be kept small. This reduces the risk of the light-transmitting sealing layer cracking under the stress generated by the thermal expansion of the sealing cover, thereby improving the laser fabrication yield.

[0078] In addition, because the transition structure has a large unfolded area, the heat generated during the process of fixing the sealing cover to the shell can be absorbed and dissipated by the transition structure, which can reduce the heat transferred to the light-transmitting sealing layer, reduce the deformation of the light-transmitting sealing layer due to thermal expansion, and reduce the risk of the light-transmitting sealing layer cracking or detaching from the sealing cover.

[0079] In other embodiments of this application, the light-emitting chip generates a large amount of heat during operation. This heat is transferred to the substrate 1011 via a heat sink, and then conducted to the sealing cover 103 via the side wall portion 1012 of the housing 101. The effect of this heat on the sealing cover is the same as the effect of the heat generated by parallel sealing. The transition structure in the sealing cover 103 also undergoes a certain degree of shrinkage and deformation under the influence of this heat to absorb stress. After the light-emitting chip stops operating and cools down, the transition structure can return to its original shape to release stress.

[0080] For other embodiments of this application, the material of the shell, the structure and material of the light-transmitting sealing layer, etc., can be referred to the relevant content described above in this application, and will not be repeated here.

[0081] In other embodiments of this application, the waveform of the transition structure W3 in the sealing cover 103 is wavy or corrugated, that is, the cross-section of the transition structure W3 is a wavy line or corrugated line, and the cross-section is perpendicular to the surface where the opening of the tube shell 101 is located. If the transition structure is wavy, the peaks and troughs of the transition structure are arc-shaped, which can avoid excessive stress concentration at the peaks and troughs when the tube shell and sealing cover are heated and expanded, reducing the risk of damage to the sealing cover under stress. If the transition structure is corrugated, the transition structure can be more similar to the structure of a compression spring, and the corrugated structure can more easily undergo compression deformation when the tube shell and sealing cover are heated and expanded, so as to more easily release stress. In one possible embodiment, the waveform of the transition structure W3 has 2 to 3 wave periods. It should be noted that each wave period in the waveform of the transition structure can be the same or different, such as the part between two adjacent peaks or troughs in the waveform can be the same or different. The waveform can also have four, five or more wave periods. In one possible implementation, the waveform can be a triangular wave, a sawtooth wave, or a sine wave, etc.

[0082] For example, Figure 5 The following example illustrates a waveform that is wavy, triangular, and has three cycles. Figure 5 As shown, the waveform includes three axisymmetric V-shaped substructures connected in sequence. Each V-shaped substructure consists of two plate-like structures connected together, and the three V-shaped substructures can have identical shapes and dimensions. In one possible implementation, the multiple V-shaped substructures can also have the same shape but different dimensions, or they can have different shapes, such as the included angle between the two plate-like structures that make up different V-shaped substructures.

[0083] Please continue to refer to this. Figure 5The transition structure W3 and inner edge portion W1 of the sealing cover 103 are recessed towards the inner edge portion W2 of the tube shell 101. That is, the distance between the transition structure W3 and the base plate 1011 is smaller than the distance between the outer edge portion W2 and the base plate 1011, and the distance between the inner edge portion W1 and the base plate 1011 is also smaller than the distance between the outer edge portion W2 and the base plate 1011. When using parallel sealing welding technology to fix the sealing cover 103 and the tube shell 101, after placing the sealing cover 103 on the tube shell 103, a sealing welding device similar to a roller needs to be used to roll the outer edge portion W2 of the sealing cover 103. In this embodiment, the transition structure W3 and inner edge portion W1 are recessed towards the inner edge portion W2 of the tube shell 101, which avoids the sealing welding device contacting the transition structure W3 and inner edge portion W1 during the rolling process and causing any impact on the transition structure W3 and inner edge portion W1.

[0084] like Figure 5 As shown, both the inner edge portion W1 and the outer edge portion W2 of the sealing cover plate 103 can be flat annular plate structures. In one possible embodiment, the inner edge portion W1 and the outer edge portion W2 can be parallel. The transition structure W3 can be flush with the inner edge portion W1, such as when the peak of the waveform in the transition structure W3 is flush with the inner edge portion W1. In one possible embodiment, the inner edge portion W1 can also be flush with any plane between the peak and trough in the transition structure W3; this embodiment is not limited thereto.

[0085] Please continue to refer to this. Figure 5 The sealing cover 103 also includes a first connecting portion L1 for connecting the transition structure W3 and the outer edge portion W2. The first connecting portion L1 is a plate-like structure, which can be perpendicular to the inner edge portion W1 and the outer edge portion W2. When the sidewall portion 1012 of the casing 101 expands due to heat, the expanded sidewall portion 1012 can transfer stress to the transition structure W3 by compressing the first connecting portion L1. Furthermore, the direction of the force applied by the sidewall portion 1012 to the transition structure W3 is parallel to the propagation direction of the waveform of the transition structure W3, thus allowing the transition structure W3 to more easily undergo compressive deformation to absorb stress. In this way, a bending structure can exist between the outer edge portion W2 and the transition structure W3, such as a bending structure including the connection portion between the outer edge portion W2 and the first connecting portion L1, and the connection portion between the first connecting portion L1 and the transition structure W3. When the casing 101 and the sealing cover 103 expand due to heat, the bending structure can deform along the bending direction to absorb some of the stress, further reducing the stress transmitted to the light-transmitting sealing layer 104. Therefore, the presence of the first connection portion L1 connecting the transition structure W3 and the outer edge portion W2 can improve the stress absorption effect of the sealing cover 103. In one possible embodiment, the bend of the bending structure can have a chamfer or rounded corner to avoid excessive stress concentration at the bend.

[0086] In one possible implementation, the sealing cover may not include the plate-like structure connecting the transition structure and the outer edge portion. Instead, the transition structure can be directly connected to the outer edge portion, in which case the transition structure connects the outer edge portion and the inner edge portion. In this case, the angle between the waveform centerline of the transition structure and the outer edge portion can be an obtuse angle, and the angle between the waveform centerline of the transition structure and the inner edge portion can be an acute angle. This ensures that when the sidewall portion of the casing expands due to heat and compresses the sealing cover, the force applied to the sealing cover can be decomposed into the propagation direction of the waveform of the transition structure. Furthermore, the component force in this direction allows the transition structure to compress and deform like a compression spring, absorbing some of the stress.

[0087] In one possible implementation, the inner edge portion of the sealing cover may also be recessed toward the housing relative to the transition structure. Figure 6 This is a schematic diagram of another laser structure provided in an embodiment of this application. For example... Figure 6 As shown, the transition structure W3 of the sealing cover 103 and the inner edge portion W1 are recessed into the tube shell 101 relative to the outer edge portion W2, and the inner edge portion W1 is also recessed into the tube shell 101 relative to the transition structure W3. Figure 6 laser relative to Figure 2 The laser's inner edge portion W1 is recessed into the housing 101 only relative to the transition structure W3. For descriptions of other parts, please refer to [the relevant documentation / reference]. Figure 2 The description of the previous embodiments will not be repeated here.

[0088] It should be noted that when fixing the sealing cover 103 to the light-transmitting sealing layer 104, sealant needs to be applied to the inner edge portion W1 of the sealing cover 103 first, so that the light-transmitting sealing layer 104 covers the inner edge portion W1, and the edge of the light-transmitting sealing layer 104 is in close contact with the sealant. This causes the inner edge portion W1 to be recessed into the tube shell 101 relative to the transition structure W3. The height difference between the transition structure W3 and the inner edge portion W1 ensures that the sealant is only located on the inner edge portion W1, avoiding the effect of sealant flowing to the transition structure W3 on the shrinkage deformation effect of the transition structure W3.

[0089] In one possible implementation, the transition structure W3 is recessed into the housing 101 relative to the inner edge portion W1. Alternatively, the transition structure W3 may be flush with the outer edge portion W2, such that the highest peak of the waveform of the transition structure W3 is flush with the outer edge portion W2, and the inner edge portion W1 is recessed into the housing 101 relative to the outer edge portion W2 and the transition structure W3.

[0090] In one possible implementation, the transition structure in the sealing cover may include adjacent first and second portions along the direction from the inner edge to the outer edge, at least one of which is wavy, and the first portion protrudes outward from the casing relative to the second portion and the inner edge. Thus, both the first and second portions can be recessed inward from the casing relative to the outer edge. In another possible implementation, the second portion can be recessed inward from the casing relative to the inner edge. Because the first portion is close to the inner edge and protrudes relative to it, the height difference between the first portion and the inner edge can limit the position of the sealant when applying sealant to the inner edge, preventing it from flowing to other locations. The fact that both the first and second portions are recessed inward from the casing relative to the outer edge ensures that they are far from the sealing equipment during parallel welding, avoiding any influence or damage from the welding equipment.

[0091] Figure 7 This is a schematic diagram of another laser structure provided in the embodiments of this application. Figure 8 This is a schematic diagram of the structure of a sealing cover provided in an embodiment of this application. Figure 9 This is a schematic diagram of another sealing cover provided in an embodiment of this application. Figure 8 for Figure 9 The diagram shows the interface b-b' of the sealing cover. Figure 7 The laser shown includes Figure 8 or Figure 9 The sealing cover 104 is shown. (As shown) Figures 7 to 9 As shown, the transition structure W3 in the sealing cover 104 includes an adjacent first portion B1 and a second portion B2 along the direction from the inner edge portion W1 to the outer edge portion W2. At least one of the first portion B1 and the second portion B2 is wavy, and the first portion B1 protrudes outward from the casing 101 relative to the second portion B2 and the inner edge portion W2.

[0092] Figures 7 to 9Taking a rectangular (or n-shaped) first part B1 and a wave-shaped second part B2 as an example. The first part B1 includes a second connecting part L2, a third connecting part L3, and a fourth connecting part L4 connected sequentially, with the second connecting part L2 and the fourth connecting part L4 perpendicular to the third connecting part L3. The second connecting part L2 is connected to the inner edge part W1, and the fourth connecting part L4 is connected to the second part B2. The second connecting part L2, the third connecting part L3, and the fourth connecting part L4 are all flat annular plate structures, with the third connecting part L3 parallel to the inner edge part W1. Thus, the sealing cover can include multiple bending structures, such as the connection between the second and third connecting parts, and the connection between the third and fourth connecting parts. When the shell and the sealing cover are heated and expand, these bending structures can deform along the bending direction to absorb some stress, further improving the stress absorption effect of the sealing cover. In one possible implementation, the angle between the second connecting portion and the third connecting portion may be obtuse or acute, and the angle between the fourth connecting portion and the third connecting portion may also be obtuse or acute. The third connecting portion may not be parallel to the inner edge portion. The first portion may also be arched or other shapes, which are not limited in the embodiments of this application.

[0093] In one possible implementation, the first part may be wave-shaped, and the second part may be flat. For example, the third connecting part in the first part may be wave-shaped, while the second and fourth connecting parts may both be flat plate-like structures; or any two of the second, third, and fourth connecting parts may be wave-shaped, or all three connecting parts may be wave-shaped. In one possible implementation, both the first part and the second part may be wave-shaped, and this application does not limit the scope of the embodiments.

[0094] In one possible implementation, please continue to refer to Figure 7 The second portion B2 of the transition structure W3 is recessed into the housing 101 relative to the inner edge portion W1, such that the peaks of the waveform in the second portion B2 are recessed into the housing 101 relative to the inner edge portion W1. In one possible embodiment, the second portion of the transition structure may also be flush with the inner edge portion, such that the peaks of the waveform in the second portion are flush with the inner edge portion. In another possible embodiment, the inner edge portion is recessed into the housing relative to the second portion of the transition structure, such that the inner edge portion is recessed into the housing relative to the troughs of the waveform in the second portion.

[0095] Figure 10 This is a schematic diagram of the structure of yet another laser provided in some other embodiments of this application. Exemplarily, using... Figure 5 The structure of the laser sealing cover 103 shown is illustrated. Figure 10 As shown, in Figure 5In addition to the above, the laser 10 also includes a collimating lens assembly 105, which is located on the side of the light-transmitting sealing layer 104 away from the housing 101. For example, the edge of the collimating lens assembly 105 can overlap the outer edge portion W2 of the sealing cover plate 103 and be fixed to the outer edge portion W2 by adhesive material. Thus, the collimating lens assembly 105 can be supported by the side wall portion 1012 of the housing 101, ensuring the reliability of the collimating lens assembly 105. In one possible embodiment, the collimating lens assembly 105 can also be located between the sealing cover plate 104 and the bottom plate 1011 of the housing 101; this embodiment does not limit the scope of the invention.

[0096] Figures 11 to 15 This is a schematic diagram of the structure of a laser provided in some other embodiments of this application.

[0097] like Figure 11 As shown, the casing 101 includes a base plate 1011 and a tubular sidewall 1012, with multiple light-emitting components 102 located within the cavity formed by the base plate 1011 and the sidewall 1012. In one possible embodiment, the base plate 1011 and the sidewall 1012 in the casing 101 are an integral structure or separate structures, formed by welding them together to form the casing 101. In the following embodiments of this application, the sidewall 1012 is a square tubular structure as an example. In one possible embodiment, the sidewall 1012 can also be a circular tubular structure, a pentagonal tubular structure, or a tubular structure of other shapes. This application does not limit the embodiments. The inner wall and / or outer wall of the sidewall 1012 away from the base plate 1011 have a groove K extending circumferentially along the sidewall 1012. Figure 11 Taking the example where only the outer wall of the sidewall 1012 has a groove K, in one possible implementation, only the inner wall of the sidewall 1012 has a groove, or both the outer and inner walls may have grooves; this application does not limit the specific implementation. The sealing cover 103 is annular, and its outer edge is fixed to the surface of the sidewall 1012 away from the bottom plate 1011. The light-transmitting sealing layer 104 is fixed to the inner edge of the sealing cover 103, such as the edge of the light-transmitting sealing layer 104 being fixed to the inner edge of the sealing cover 103. The collimating lens assembly 105 is located on the side of the sealing cover 103 away from the bottom plate 1011.

[0098] In some embodiments of this application, the thickness of the outer edge of the sealing cover 103 is less than a preset thickness threshold, and the outer edge is relatively thin. The outer edge is fixed to the surface of the sidewall 1012 away from the bottom plate by parallel sealing welding technology. The inner edge of the sealing cover 103 is recessed towards the bottom plate 1011 relative to the outer edge. In one possible embodiment, the sealing cover 103 is a sheet metal part, and the thickness of the sealing cover 103 is the same or approximately the same at all positions.

[0099] During parallel sealing welding, the casing 101 and the sealing cover 103 will expand due to heat, resulting in significant stress. Because the sidewall portion of the sidewall 1012 containing the groove K is relatively thin, this portion is more prone to deformation under this stress, becoming uneven. However, the deformation can be less than a set deformation threshold, meaning the deformation is relatively small. This effectively converts the stress into mechanical force, thus absorbing stress and reducing the stress transmitted to the light-transmitting sealing layer 104.

[0100] In some embodiments of this application, the collimating lens group 105 is used to collimate the light emitted by the light-emitting component before it is emitted. It should be noted that collimating the light is equivalent to converging the light, thus reducing the divergence angle and making it closer to parallel light. The collimating lens group 105 may include multiple collimating lenses, each corresponding to one of the multiple light-emitting components 102 in the laser. The light emitted by each light-emitting component can be directed to the corresponding collimating lens and then collimated before being emitted.

[0101] In some embodiments of this application, after the sealing cover 103 is fixed to the housing 101, the collimating lens assembly 105 can be suspended on the side of the sealing cover 103 away from the base plate to adjust the light collimation effect. After adjusting and determining the position of the collimating lens assembly 105, an adhesive is applied to the outer edge of the sealing cover 103, and then the collimating lens assembly 105 is fixed to the sealing cover 103 by the adhesive. Since the position of the collimating lens assembly 105 can be adjusted, even if the heat generated when fixing the sealing cover 103 causes slight deformation of the side wall 1012, the position adjustment of the collimating lens assembly 105 can compensate for the influence of the deformation of the side wall 1012 on the light emission of the light-emitting component 102, thereby ensuring the normal light emission of the laser 10.

[0102] In one possible implementation, the orthographic projection of the outer edge of the sealing cover 103 on the base plate 1011 lies within the orthographic projection of the surface of the side wall 1012 away from the base plate 1011. That is, the outer edge of the sealing cover 103 can be retracted relative to the outer wall of the side wall 1012, and does not extend beyond the side wall 1012. In one possible implementation, the maximum distance d1 between the outer edge of the sealing cover 103 and the outer edge of the side wall 1012 is less than 0.1 mm, such as 0.05 mm. In one possible implementation, the outer edge of the sealing cover 103 and the outer edge of the side wall 1012 form a similar, co-centered shape (e.g., both are rectangles). In this case, the distances between the outer edges of the sealing cover 103 and the outer edges of the side wall 1012 at all positions are equal, and these distances can all be less than 0.1 mm, such as 0.05 mm. Because the surface in the sealing welding equipment that contacts the object being welded is an inclined plane, and the outer edge of the outer edge portion is recessed relative to the outer edge of the sidewall, it can be ensured that the inclined plane of the sealing welding equipment can simultaneously contact the outer edge of the sealing cover and the surface of the sidewall away from the base plate. This allows both the outer edge and the sidewall to melt, resulting in a better parallel sealing welding effect. In one possible embodiment, the outer edge of the sidewall of the tube shell can also coincide with the outer edge of the sealing cover; this application does not limit this.

[0103] In some embodiments of this application, the inner edge of the sealing cover 103 is recessed towards the bottom plate relative to its outer edge. The outer edge of the sealing cover is an annular plate structure, and the width of the outer edge can be wider than the width of the surface of the sidewall 1012 away from the bottom plate 1011. Furthermore, the difference between the width of the outer edge portion W2 and the width of the surface of the sidewall 1012 away from the bottom plate 1011 can be less than a set threshold, meaning the width of the outer edge can be slightly wider than the width of the surface of the sidewall 1012 away from the bottom plate 1011. It should be noted that any annular structure described in the embodiments of this application refers to the width of the annulus.

[0104] In some embodiments of this application, the groove K is a U-shaped groove or a rectangular groove (or may also be called a square groove). A U-shaped groove is a groove with a U-shaped cross-section, and a rectangular groove is a groove with a rectangular cross-section perpendicular to the extending direction of the groove. In one possible implementation, the groove includes two side surfaces and a bottom surface connecting the two side surfaces. The bottom surface of the U-shaped groove may not be planar, while the bottom surface of the rectangular groove may be planar. Embodiments of this application Figure 11 and Figure 12 Taking a rectangular groove as an example. In one possible implementation, the groove can also be a groove of other shapes, such as a trapezoidal groove, a V-shaped groove, or a semi-circular groove. In this case, the groove may only include one groove surface or two side surfaces. This application does not limit the specific shape of the groove.

[0105] In some embodiments of this application, the wall thickness d2 at the location of the groove K in the sidewall 1012 is less than or equal to 0.6 mm, such as 0.25 mm. It should be noted that the wall thickness at the location of the groove in the sidewall can include the wall thickness at any position within the groove. In one possible implementation, if the groove includes a groove surface parallel to the inner wall of the sidewall (e.g., a rectangular groove), and the bottom surface of the groove is parallel to the inner wall, then the wall thickness at each position within the groove in the sidewall is the same, such as 0.25 mm. If the bottom surface of the groove is not parallel to the inner wall of the sidewall (e.g., a U-shaped groove), then the wall thickness at each position within the groove in the sidewall is different. In the embodiments of this application, regardless of whether the wall thickness at each position within the groove is the same, the wall thickness at each position can be less than or equal to 0.6 mm. This ensures that the wall thickness at the location of the groove in the sidewall is relatively thin, and the sidewall at the location of the groove is more easily deformed under the stress generated by the thermal expansion of the shell, thus more easily absorbing the stress.

[0106] In some other embodiments of this application, a groove K at the end of the sidewall 1012 away from the base plate 1011 surrounds the entire inner annular surface of the sidewall 1012. The extension trajectory of the groove K is the same as the shape of the sidewall 1012. For example, if the sidewall 1012 is a square tubular structure, the extension trajectory of the groove K can be rectangular. In one possible implementation, if the sidewall is a circular tubular structure, the extension trajectory of the groove can be circular.

[0107] It should be noted that the embodiments of this application take the example of a sidewall having only one groove on its outer wall, and this groove surrounding the entire inner annular surface of the sidewall. In one possible implementation, the sidewall may also have multiple grooves. For example, the extension trajectory of each of the multiple grooves may be rectangular, and each groove surrounds the inner annular surface of the sidewall, such as the multiple grooves being arranged sequentially on the sidewall in a direction away from the bottom plate. As another example, the extension trajectory of the multiple grooves may not be rectangular, nor may they surround the entire inner annular surface of the sidewall. For example, each of the multiple grooves may be a strip-shaped groove extending in the same direction, and the multiple grooves may be arranged on different sides of the sidewall; if the sidewall is a square tubular structure, the sidewall may have four grooves located on the four sides of the sidewall, and the length of each groove may be less than or equal to the length of one side of the sidewall where the groove is located, or the sidewall may only have grooves located on three or two sides, which is not limited in the embodiments of this application. In one possible implementation, some of the grooves may be located on the outer wall of the sidewall, and some may be located on the inner wall of the sidewall, or all of them may be located on either the inner or outer wall of the sidewall. This application does not limit the specific implementation.

[0108] In one possible implementation, the distance d3 between the surface of the sidewall 1012 of the casing 101 that is parallel to and away from the base plate 1011 and the groove K can also be less than or equal to 0.6 mm, such as 0.25 mm. This surface of the sidewall 1012 that is parallel to and away from the base plate 1011 is also the surface fixed to the outer edge of the sealing cover 103. It should be noted that the distance between this surface and the groove can include the minimum distance between each position on this surface and the groove in the direction perpendicular to the base plate. In one possible implementation, the groove surface near this surface in the groove can be parallel to this surface, and the minimum distance between each position on this surface and the groove can be equal, and all are the distance between the groove surface and the surface, such as 0.25 mm. If the minimum distance between different positions on this surface and the groove is different, then the minimum distance between each position and the groove can also be less than or equal to 0.6 mm. For example, as... Figure 11 As shown, the groove K is a rectangular groove. The surface of the sealing cover 103 that is parallel to and away from the bottom plate 1011 is parallel to the groove surface of the groove K near this surface. The distance d3 between this surface and the groove K can be equal to the wall thickness d2 at the location of the groove in the sidewall. When fixing the outer edge of the sealing cover to the sidewall of the tube shell using a sealing welding device, it is necessary to melt the connection between the outer edge of the sealing cover and the sidewall. In related technologies, the sidewall of the tube shell is a tubular structure with both the inner and outer walls flat, and the height of the sidewall is relatively large. Therefore, the melting rate of the sidewall under the action of the sealing welding device is slow and difficult. However, in the embodiment of this application, the distance d3 between the surface of the sidewall that is parallel to and away from the bottom plate and the groove is small. Therefore, the thickness of the part of the sidewall located between this surface and the groove in the direction perpendicular to the bottom plate is thinner. This part is easier to melt under the action of the sealing welding device, thereby improving the efficiency of sealing the cover and the welding strength between the sealing cover and the sidewall.

[0109] In some embodiments of this application, the sidewalls can be fabricated in various ways. Two of these methods are described below:

[0110] In the first possible implementation, the inner or outer wall of a tubular structure with both inner and outer walls flat can be machined to form a groove, thereby obtaining... Figure 11 The tube shell is shown. Grooves can be formed at specific locations in the tubular structure by grinding or milling with tools (such as milling cutters), or by etching specific locations in the tubular structure.

[0111] For the second possible implementation, please refer to Figure 13 and Figure 14 , Figure 13 This is a schematic diagram of a shell structure provided in an embodiment of this application. Figure 14This is an exploded structural diagram of a shell provided in an embodiment of this application. Figure 13 for Figure 14 The diagram shows a cross-section b-b' of the tubular shell. The sidewall 1012 includes a first tubular structure 1012a and a second tubular structure 1012b. The first tubular structure 1012a is fixed to the base plate 1011, and the second tubular structure 1012b is fixed to the surface of the first tubular structure 1012a away from the base plate 1012a. The first tubular structure 1012a is a tubular structure with both its inner and outer walls flat, and the second tubular structure 1012b has a groove K. That is, the second tubular structure 1012b is the end of the sidewall 1012 away from the base plate 1011, and the groove K of the sidewall 1012 is the groove of the second tubular structure 1012b. It should be noted that the materials of the first tubular structure 1012a and the second tubular structure 1012b can be the same or different, and this embodiment does not limit this.

[0112] For example, the second tubular structure 1012b is a sheet metal part. It can be obtained by stamping a ring-shaped plate structure using sheet metal processes to create recesses or protrusions in specific areas. For instance, it can be obtained by bending the two ends of the ring-shaped plate structure outwards, or by recessing the area between the two ends of the ring-shaped plate structure inwards. Figure 13 and Figure 14 The second tubular structure 1012b is shown. In one possible embodiment, the second tubular structure 1012b can be fixed to the surface of the first tubular structure 1012a away from the base plate 1011 by brazing. In another possible embodiment, the surface of the first tubular structure 1012a away from the base plate 1011 and the surface of the second tubular structure 1012b near the base plate 1011 can be of the same shape, and the orthographic projections of the first tubular structure 1012a and the second tubular structure 1012b on the base plate can completely coincide.

[0113] In some other embodiments of this application, the cross-section of the sidewall at the end away from the base plate can be a square wave extending in a direction perpendicular to the base plate, the cross-section being perpendicular to the base plate, and the square wave can have one, two, three, or even more wave periods. For example, for the second possible implementation of the above-mentioned sidewall, the cross-section of the second tubular structure 1012b can be a square wave extending along the length direction of the second tubular structure 1012b. Figure 15 This is a schematic diagram of another tubular shell structure provided in an embodiment of this application, as shown below. Figure 15 As shown, the cross-section of the second tubular structure 1012b has a square waveform with two wave periods, that is, the inner wall and the outer wall of the second tubular structure 1012b each have a groove K.

[0114] The cross-section of the sidewall away from the bottom plate is a square wave extending in the direction perpendicular to the bottom plate, meaning the grooves on the sidewall are rectangular. If this square wave has multiple periods, that is, if the sidewall away from the bottom plate has multiple grooves, these multiple grooves are alternately arranged on the inner and outer walls of the sidewall in the direction perpendicular to the bottom plate. In one possible implementation, the dimensions of these multiple grooves can be all the same or different; this application does not limit this. The dimensions of the grooves may include the depth and width of the grooves; please refer to... Figure 13 The depth d4 of a groove is the distance between the opening of the groove and the bottom surface of the groove. The depth d4 of a certain groove is the maximum thickness d7 of the sidewall and the wall thickness d2 at the location of the groove in the sidewall (for the distance indicated by d2, please refer to...). Figure 2 The difference between the two is that the width d5 ​​of the groove is the size of the opening of the groove in the direction perpendicular to the extension of the groove.

[0115] For example, in some embodiments of this application, the maximum thickness of the sidewall can range from 1.2 mm to 2.5 mm. Since the wall thickness d2 at the location of the groove in the sidewall is less than 0.6 mm, the depth of the groove in these embodiments can range from 0.6 mm to 1.9 mm. In some embodiments of this application, the length d8 of the sidewall portion at the location of the groove in the direction perpendicular to the base plate (for the distance indicated by d8, please refer to...) Figure 15 The range of the groove width can be from 0.6 mm to 4 mm. In this embodiment, the sidewall can have one, two, three, or even more grooves. Therefore, in this embodiment, the maximum width of the groove can be less than 4 mm. It should be noted that in this embodiment, the length d8 of the sidewall portion where the groove is located (i.e., the thinner part of the sidewall) in the direction perpendicular to the bottom plate is small, thus ensuring that the sidewall still has high strength and effectively protects the components inside the tube shell. In one possible implementation, the distance between adjacent grooves in the plurality of grooves (e.g., Figure 15 The distance d6 between two adjacent grooves in the sidewall can be less than or equal to 0.6 mm. For example, the distance d6 can be equal to the wall thickness d2 at the location of the groove in the sidewall, such as 0.25 mm. When the sidewall has multiple grooves, the width of each groove can be designed according to the number of grooves. In one possible embodiment, when the sidewall has multiple grooves, the width d5 ​​of each groove can be equal, and the distance d6 between adjacent grooves can also be equal. This distance d6 can be equal to the distance d3 between the surface of the sidewall parallel to and away from the bottom plate and the groove. In this case, the width d5 ​​of each groove is d8 - n * d6, where n is the number of grooves.

[0116] In a possible implementation, the cross-section of one end of the side wall away from the bottom plate is a square wave shape extending in a direction perpendicular to the bottom plate, and the square wave has one, two or three wave periods. It can also be said that the cross-section of one end of the side wall away from the bottom plate is in a C-shape, a Z-shape or a bow shape. Among them, if only the inner wall or the outer wall of the side wall has one groove, the cross-section can be in a C-shape; if both the inner wall and the outer wall of the side wall have one groove, the cross-section can be in a Z-shape or an S-shape; if one of the inner wall and the outer wall of the side wall has one groove and the other has two grooves, the cross-section can be in a bow shape.

[0117] In a possible implementation, the side wall away from the bottom plate has a plurality of grooves arranged in a direction perpendicular to the bottom plate, which can make the end of the side wall away from the bottom plate have a plurality of bending structures (such as Figure 7 the bending structure W in). In this way, when the side wall generates stress due to heat, each bending structure can also undergo a certain deformation in its bending direction accordingly, so as to further enhance the stress absorption effect. In the embodiment of the present application, taking the bending parts of the bending structure as square corners as an example, in a possible implementation, the bending parts of the bending structure can have chamfers or rounded corners to avoid excessive stress concentration at the bending parts.

[0118] Refer to Figure 11 and Figure 12 , the light-emitting component 102 includes a light-emitting chip 1021, a heat sink 1022 and a reflection prism 1023. The heat sink 1022 can be arranged on the bottom plate 1011 of the tube shell 101, the light-emitting chip 1021 can be arranged on the heat sink 1022, the heat sink 1022 is used to assist the light-emitting chip 1021 in heat dissipation, and the reflection prism 1023 can be located on the light-emitting side of the light-emitting chip 1021. The light emitted by the light-emitting chip 1021 can be directed to the reflection prism 1023, and then reflected on the reflection prism 1023 to pass through the light-transmitting sealing layer 104 and emit. Exemplarily, multiple light-emitting chips can all emit light of the same color, or different light-emitting chips among the multiple light-emitting chips can emit light of different colors, which is not limited in the embodiment of the present application. The light emitted by the light-emitting chip can be laser. A large amount of heat is generated when the light-emitting chip 1021 is working, and then the heat is transferred to the bottom plate 1011 through the heat sink 1022, and then conducted to the side wall 1012 through the bottom plate 1011. At this time, the effect of the heat on the side wall 1012 is the same as the effect of the heat generated by parallel sealing on the side wall 1012, and the part of the side wall where the groove is located will also undergo a certain deformation under the action of this heat to absorb stress. In a possible implementation, after the light-emitting chip stops working and cools down, the side wall can restore its original shape to release stress.

[0119] Please continue to refer to Figure 12 and Figure 14The sidewalls 1012 of the housing 101 may have multiple openings on opposite sides. The laser 10 may also include multiple conductive pins 106, which can extend through the openings in the sidewalls 101 into the housing 101 and be fixed to it. The conductive pins 106 can be electrically connected to the electrodes of the light-emitting chip in the light-emitting component 102 to transmit external power to the light-emitting chip, thereby exciting the light-emitting chip to emit light. In one possible embodiment, the aperture of the openings may be 1.2 mm, and the diameter of the conductive pins 106 may be 0.55 mm.

[0120] In this embodiment, when assembling the laser, a groove can first be formed on the tubular structure, or a second tubular structure can be formed using sheet metal technology. The second tubular structure is then brazed to the first tubular structure to obtain the sidewall of the shell. The sidewall of the shell can have multiple openings, and annular solder structures (such as annular glass beads) can be placed in the openings on the sidewall of the shell. Conductive leads are passed through the solder structure and the openings where the solder structure is located. Then, the sidewall is placed around the perimeter of the base plate, and annular silver-copper solder is placed between the base plate and the sidewall. Next, the structure of the base plate, sidewall, and conductive leads is placed in a high-temperature furnace for sealing sintering. After sealing sintering and curing, the base plate, sidewall, conductive leads, and solder become a whole, thereby achieving an airtight seal at the sidewall opening. Alternatively, a light-transmitting sealing layer can be fixed to a sealing cover plate, such as by attaching the edge of the light-transmitting sealing layer to the inner edge of the sealing cover plate to obtain the upper cover assembly. Next, the light-emitting component can be welded to the base plate within the housing space of the tube. Then, the upper cover assembly is welded to the side wall of the tube away from the base plate using parallel sealing welding technology. Finally, after aligning the position of the collimating lens assembly, the collimating lens assembly is fixed to the side of the upper cover assembly away from the base plate using epoxy adhesive. This completes the assembly of the laser. It should be noted that the above assembly process is only an exemplary process provided by the embodiments of this application. The welding process used in each step can be replaced by other processes, and the order of each step can also be adjusted. This application embodiment does not limit this.

[0121] The structure and function of the light-emitting component 102 and the light-transmitting sealing layer 104 can be referred to the relevant descriptions in the above embodiments, and will not be repeated here.

[0122] It should be noted that, in the embodiments of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "multiple" refers to two or more, unless otherwise expressly defined. "Approximately" means that within an acceptable margin of error, those skilled in the art can solve the technical problem and substantially achieve the technical effect. In the accompanying drawings, the dimensions of layers and regions may be exaggerated for clarity of illustration. It is also understood that when an element or layer is referred to as being "on" another element or layer, it can be directly on the other element, or there may be intermediate layers. Similar reference numerals throughout indicate similar elements.

[0123] The above description is merely an optional embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A laser, comprising: A casing, one side of which is open; Multiple light-emitting components are located in the accommodating space of the tube shell; A sealing cover plate, the sealing cover plate being annular, the sealing cover plate including an inner edge portion and an outer edge portion, and a transition structure connecting the inner edge portion and the outer edge portion, the outer edge portion being fixed to the side where the opening of the tube shell is located; the transition structure including a first portion and a second portion arranged sequentially along a direction away from the inner edge portion; wherein, the first portion connects to the inner edge portion, and the second portion connects to the outer edge portion; The first part includes a first connecting part, a second connecting part, and a third connecting part; the second part includes a fourth connecting part and a fifth connecting part; the first connecting part, the third connecting part, and the fifth connecting part are all first annular structures, the first annular structure having a first opening edge near the inside of the tube shell and a second opening edge near the outside of the tube shell; the second connecting part and the fourth connecting part are both second annular structures. The first opening edge of the first connecting part is connected to the inner edge portion; the second opening edge of the first connecting part is connected to the inner edge of the second connecting part; the outer edge of the second connecting part is connected to the second opening edge of the third connecting part; the first opening edge of the third connecting part is connected to the inner edge of the fourth connecting part; the outer edge of the fourth connecting part is connected to the first opening edge of the fifth connecting part; and the second opening edge of the fifth connecting part is connected to the outer edge portion. A light-transmitting sealing layer, wherein the edge of the light-transmitting sealing layer is fixed to the inner edge portion; The collimating lens assembly is located on the side of the sealing cover away from the tube shell. The edge of the collimating lens assembly is bonded to the outer edge portion by an adhesive, and is also bonded to the first portion by an adhesive. The adhesive on the outer edge portion and the adhesive on the first portion form a gap on the second portion.

2. The laser according to claim 1, wherein, Both the first part and the second part are annular, and the adhesive on the outer edge part is annular.

3. The laser according to claim 2, wherein, The adhesive on the first part is ring-shaped.

4. The laser according to claim 1, wherein, The surface of the first portion away from the shell is flush with the outer edge portion, or protrudes outward from the shell relative to the outer edge portion.

5. The laser according to claim 4, wherein, The surface of the first portion away from the shell protrudes outward from the outer edge portion relative to the outer edge portion, and the distance between the surface of the first portion away from the shell and the plane containing the outer edge portion is less than 0.5 mm.

6. The laser according to claim 1, wherein, The first portion protrudes outward from the inner edge of the tube shell, and the second portion is recessed inward from the first portion.

7. The laser according to claim 1, wherein, The outer edge portion is a plate-like structure; the first annular structure is perpendicular to the plane containing the outer edge portion.

8. The laser according to claim 1, wherein, The outer edge portion is a plate-like structure; in the direction perpendicular to the plane where the outer edge portion is located, the thickness of the first annular structure ranges from 1 mm to 6 mm.

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