Laser

Abstract

The present application discloses a laser, belonging to the field of optoelectronic technology. The laser includes: a housing and a plurality of light-emitting components located in the accommodation space of the housing; each light-emitting component includes: a light-emitting chip, a heat sink, and a reflecting prism; the heat sink and the reflecting prism are both fixed on the housing, the light-emitting chip is fixed on the heat sink, the reflecting prism is located on the light-emitting side of the light-emitting chip, and the reflecting prism has a bottom surface and a reflecting surface connected to each other; the light-emitting chip is used to emit laser light to the reflecting surface of the reflecting prism, and the reflecting surface is used to reflect the incident laser light; wherein, the reflecting prism is fixed on the housing through an adhesive covering the bottom surface, and the connection between the bottom surface and the reflecting surface is arc-shaped. The present application solves the problem of low light-emitting efficiency of the laser. The present application is used for emitting light.

Description

Technical Field

[0001] This application relates to the field of optoelectronic technologies, and particularly to a laser. Background Art

[0002] With the development of optoelectronic technologies, lasers are widely used, and the requirements for the luminous efficiency of lasers are also getting higher and higher.

[0003] As Figure 1 shown, a laser 00 includes a tube housing 001 and a plurality of light-emitting components 002 fixed in the tube housing 001. Each light-emitting component 002 includes a light-emitting chip 0021, a heat sink 0022, and a reflecting prism 0023. The heat sink 0022 and the reflecting prism 0023 are both fixed on the bottom plate of the tube housing 001. The light-emitting chip 0021 is fixed on the heat sink 0022. The reflecting prism 0023 is located on the light-emitting side of the light-emitting chip 0021, and the surface M1 of the reflecting prism 0023 close to the light-emitting chip 0021 is a reflecting surface. The light-emitting chip 0021 is configured to emit laser light to the reflecting prism 0023, and the laser light is emitted after being reflected on the reflecting surface M1 of the reflecting prism 0023. When fixing the reflecting prism 0023, it is necessary to first apply an adhesive X on the bottom plate of the tube housing 001, then make the bottom surface M2 of the reflecting prism 0023 contact the adhesive X and press the reflecting prism 0023 to ensure that the reflecting prism 0023 is in relatively close contact with the adhesive X, so as to fix the reflecting prism 0023 through the adhesive X. The reflecting surface M1 and the bottom surface M2 of the reflecting prism 0023 are directly connected, and both the reflecting surface M1 and the bottom surface M2 are flat surfaces.

[0004] Since the adhesive has fluidity, when pressing the reflecting prism 0023, the adhesive X is likely to spread along the bottom surface M2 of the reflecting prism 0023 and then adhere to the reflecting surface M1 of the reflecting prism 0023. This results in a poor reflecting effect of the reflecting surface, and further leads to a low luminous efficiency of the laser. Summary of the Invention

[0005] This application provides a laser that can solve the problem of low luminous efficiency of the laser. The laser includes:

[0006] A tube housing and a plurality of light-emitting components, the plurality of light-emitting components being located in the accommodation space of the tube housing;

[0007] Each of the light-emitting components includes: a light-emitting chip, a heat sink, and a reflecting prism; the heat sink and the reflecting prism are both fixed on the tube housing, the light-emitting chip is fixed on the heat sink, the reflecting prism is located on the light-emitting side of the light-emitting chip, and the reflecting prism has a bottom surface and a reflecting surface that are connected to each other; the light-emitting chip is configured to emit laser light to the reflecting surface of the reflecting prism, and the reflecting surface is configured to reflect the incident laser light;

[0008] Among them, the reflection prism is fixed to the casing through an adhesive covering the bottom surface, and the connection between the bottom surface and the reflecting surface is arc-shaped.

[0009] The beneficial effects brought by the technical solution provided in this application at least include:

[0010] In the laser provided in this application, the connection between the bottom surface and the reflecting surface of the reflection prism is arc-shaped. In this way, when the reflection prism is placed on the adhesive, the area of the bottom surface of the reflection prism outside this connection can first contact the adhesive. When pressing the reflection prism, the adhesive can first spread to the connection between the bottom surface and the reflecting surface, and will not directly spread to the reflecting surface. And compared with the diffusion speed on a plane, the diffusion speed of the adhesive on this arc-shaped connection is slower. Therefore, the adhesion of the adhesive on the reflecting surface of the reflection prism can be reduced or even avoided, ensuring a high reflecting effect of the reflecting surface, and thus a high light-emitting efficiency of the laser.

[0011] Moreover, the connection between the bottom surface and the reflecting surface is arc-shaped, which can increase the contact area between the reflection prism and the adhesive and improve the bonding reliability of the reflection prism. Description of the Drawings

[0012] In order to more clearly illustrate the technical solutions in the embodiments of this application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of this application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to these drawings.

[0013] Figure 1 is a schematic structural diagram of a laser provided by the related art;

[0014] Figure 2 is a schematic structural diagram of a laser provided by the related art;

[0015] Figure 3 is a schematic structural diagram of a laser provided by an embodiment of this application;

[0016] Figure 4 is a schematic structural diagram of another laser provided by an embodiment of this application;

[0017] Figure 5 is a schematic structural diagram of yet another laser provided by an embodiment of this application;

[0018] Figure 6 is an exploded structural diagram of a laser provided by an embodiment of this application. Detailed Embodiments

[0019] To make the objectives, technical solutions, and advantages of this application clearer, the following will further describe the embodiments of this application in detail with reference to the accompanying drawings.

[0020] With the development of optoelectronic technology, lasers are increasingly widely used, and there are also increasingly high requirements for the luminous efficiency and reliability of lasers. In related technologies, the coating area of the adhesive on the bottom plate of the package is also reduced to reduce the adhesion of the adhesive on the reflecting surface of the reflecting prism. Exemplarily, Figure 2 is a schematic structural diagram of another laser provided in related technologies. As Figure 2 shown, when placing the reflecting prism 0023 on the adhesive X, only a partial area of the bottom surface M2 of the reflecting prism 0023 that is far from the heat sink 0022 may be in contact with the adhesive X, and the front-end area of the bottom surface M2 that is close to the heat sink 0022 is not in contact with the adhesive X. In this way, when pressing the reflecting prism 0023, the adhesive X can first spread to the front-end area of the bottom surface of the reflecting prism 0023, rather than directly spreading onto the reflecting surface M1 of the reflecting prism 0023, thereby reducing the adhesion of the adhesive X on the reflecting surface M1 of the reflecting prism 0023. However, in this method, the contact area between the reflecting prism and the adhesive is small, the adhesion strength of the reflecting prism is low, and the reliability of the laser is low.

[0021] The following embodiments of this application provide a laser that can reduce the adhesion of the adhesive on the reflecting surface of the reflecting prism, improve the luminous efficiency of the laser. It can also ensure a large contact area between the reflecting prism and the adhesive, improve the adhesion strength of the reflecting prism, and improve the reliability of the laser.

[0022] Figure 3 is a schematic structural diagram of a laser provided by an embodiment of this application. As Figure 3 shown, the laser 10 includes: a package 101 and a plurality of light-emitting components 102, and the plurality of light-emitting components 102 are located in the accommodating space of the package 101.

[0023] Each light-emitting component 102 includes: a light-emitting chip 1021, a heat sink 1022, and a reflecting prism 1023. The heat sink 1022 and the reflecting prism 1023 are both fixed on the package 101, the light-emitting chip 1021 is fixed on the heat sink 1022, the reflecting prism 1023 is located on the light-emitting side of the light-emitting chip 1021, and the reflecting prism 1023 has a bottom surface M2 and a reflecting surface M1 that are connected to each other; the light-emitting chip 1021 is configured to emit laser light to the reflecting surface M1 of the reflecting prism 1023, and the reflecting surface M1 is configured to reflect the incident laser light. Among them, the reflecting prism 1023 is fixed on the package 101 through an adhesive X that coats the bottom surface M2, and the connection between the bottom surface M2 and the reflecting surface M1 is arc-shaped.

[0024] When fixing the fixed reflection prism, an adhesive (also known as dispensing) can be first applied at a set position on the shell, and then the reflection prism is placed on the adhesive. Since the connection between the bottom surface and the reflective surface of the reflection prism is arc-shaped, when the reflection prism is placed on the adhesive, the area of the bottom surface outside the connection first comes into contact with the adhesive. Then, pressure can be applied to the reflection prism to ensure close contact between the reflection prism and the adhesive. At this time, under the action of this pressure, the adhesive can spread in the gap between the reflection prism and the shell to fill the gap. For example, the adhesive can spread along the arc-shaped connection, and in the spreading direction of the adhesive, the gap between the arc-shaped connection and the shell gradually becomes larger, and more adhesive is required to fill this gap. Therefore, the spreading speed of the adhesive on the arc-shaped connection is relatively slow. In this way, it can be ensured that the adhesive covers the arc-shaped connection and reduces or even avoids the adhesive from spreading to the reflective surface of the reflection prism. Moreover, compared with the way in the related art where the connection between the reflective surface and the bottom surface of the reflection prism is a sharp angle, the arc-shaped connection can make the area of this connection larger, and this connection can come into contact with the adhesive, so that the contact area between the reflection prism and the adhesive can be increased, and the bonding firmness of the reflection prism can be improved.

[0025] In summary, in the laser provided by the embodiment of the present application, the connection between the bottom surface and the reflective surface of the reflection prism is arc-shaped. In this way, when the reflection prism is placed on the adhesive, the area of the bottom surface of the reflection prism outside the connection can first come into contact with the adhesive. When pressing the reflection prism, the adhesive can first spread to the connection between the bottom surface and the reflective surface, rather than directly spreading to the reflective surface. And compared with the spreading speed on a plane, the spreading speed of the adhesive on the arc-shaped connection is slower. Therefore, it can reduce or even avoid the adhesion of the adhesive on the reflective surface of the reflection prism, ensure a high reflective effect of the reflective surface, and thus the light-emitting efficiency of the laser is relatively high.

[0026] Moreover, the connection between the bottom surface and the reflective surface is arc-shaped, which can increase the contact area between the reflection prism and the adhesive and improve the bonding reliability of the reflection prism.

[0027] In the embodiments of the present application, one side of the package 101 has an opening. The package 101 may include a bottom plate 1011 and a side wall 1012. The side wall 1012 may be annular, and the side wall 1012 is fixed on the bottom plate 1011. The opening of the side wall 1012 that is not covered by the bottom plate 1011 is the opening of the package 101. A plurality of light-emitting components 102 in the laser are located in the cavity surrounded by the bottom plate 1011 and the side wall 1012. Optionally, the bottom plate 1011 and the side wall 1012 in the package 101 may be an integral structure, or may also be independent structures, and are welded together to form the package 101. In the embodiments of the present application, taking the side wall 1012 as a square tubular structure as an example, optionally, the side wall 1012 may also be a circular tubular structure, a pentagonal tubular structure or a tubular structure of other shapes, which is not limited in the embodiments of the present application. Optionally, the laser in the embodiments of the present application may be a multi-chip laser diode (MCL) type laser, and the plurality of light-emitting components 102 may be arranged in multiple rows and multiple columns on the bottom plate 1011. The heat sink 1022 and the reflecting prism 1023 in each light-emitting component 102 are both fixed on the bottom plate 1011, and the surface of the bottom plate 1011 for fixing the heat sink and the reflecting prism is a plane.

[0028] Optionally, a reflecting film (not shown in the embodiments of the present application) may be provided on the surface of the reflecting prism in each light-emitting component close to the light-emitting chip. The reflecting film is used to reflect the incident laser, that is, the reflecting surface in the reflecting prism may be the surface of the reflecting film, and the reflecting prism realizes its reflection effect on the laser through the reflecting film. Optionally, the reflecting film may be provided on the reflecting prism by attachment or optical coating.

[0029] In the embodiments of the present application, the connection between the bottom surface and the arcuate reflecting surface of the reflecting prism may be circular arc-shaped or elliptical arc-shaped. In the embodiments of the present application, the arc is taken as an example of a circular arc for illustration. It should be noted that when the connection is circular arc-shaped, the curvatures of all positions on the connection are equal. When the connection is elliptical arc-shaped, the curvatures of different positions on the connection may be different.

[0030] In the embodiments of the present application, the connection between the bottom surface and the reflecting surface of the reflecting prism may include a partial area in the bottom surface of the reflecting prism and a partial area in the reflecting surface. For example, a reflecting film may be plated on a partial area in the connection; or, the connection may also only include a partial area in the bottom surface. In the embodiments of the present application, it is taken as an example that the connection only includes a partial area in the bottom surface. Please continue to refer to Figure 3, the bottom surface of the reflection prism 1023 may include: an arc surface M21 and a plane M22 that are connected to each other. The arc surface M21 is connected to the reflective surface M1, and the arc surface M21 may be the connection part of the bottom surface M2 and the reflective surface M1 mentioned above. Optionally, when the reflection prism 1023 is placed on the adhesive X, the plane M22 in the reflection prism 1023 first contacts the adhesive X. Before applying pressure to the reflection prism 1023, the arc surface M21 in the bottom surface may not contact the adhesive X. Or, under the action of the gravity of the reflection prism 1023, after the reflection prism 1023 is placed on the adhesive X, a partial area in the arc surface M21 may also contact the adhesive X, which is not limited in the embodiments of the present application. Optionally, after the reflection prism 1023 is fixed, the plane M22 in the bottom surface of the reflection prism 1023 may be parallel to the bottom plate 1011, or substantially parallel to the bottom plate 1011.

[0031] Optionally, in the direction perpendicular to the plane M22 in the bottom surface M2 of the reflection prism 1023 (such as Figure 3 the y direction in), the height of the arc surface M21 is less than the height of the heat sink 1022. For example, the height of the arc surface M21 is less than two-thirds of the height of the heat sink 1022. Wherein, the height of the arc surface M21 may refer to the distance between the end of the arc surface M21 far from the bottom plate 1011 and the plane M22 in the direction perpendicular to the plane M22; the height of the heat sink 1022 may refer to the distance between the surface of the heat sink 1022 far from the bottom plate 1011 and the surface close to the bottom plate 1011, that is, the thickness of the heat sink 1022. Or, the height of the arc surface M21 may refer to the distance between the end of the arc surface M21 far from the bottom plate 1011 and the bottom plate 1011, and the height of the heat sink 1022 may refer to the distance between the surface of the heat sink 1022 far from the bottom plate 1011 and the bottom plate 1011.

[0032] Since the light-emitting chip is disposed on the heat sink, the light-emitting chip is used to emit laser light, and the light-emitting direction of the light-emitting chip is generally parallel to the direction of the bottom plate (such as Figure 3 the x direction in), such as the direction parallel to the surface of the bottom plate for disposing the heat sink and the reflection prism, so that the height of the arc surface is less than the height of the heat sink, which can ensure that more laser light emitted by the light-emitting chip can be directed to the reflective surface and avoid waste of laser light. Further, since the laser light emitted by the light-emitting chip has a divergence angle, making the height of the arc surface less than two-thirds of the height of the heat sink can further avoid the laser light from being directed to parts other than the reflective surface and avoid waste of laser light.

[0033] Optionally, in the arrangement direction of the light-emitting chip 1021 and the reflection prism 1023 (such as Figure 3In the x - direction (in the figure), the length range of the arc surface M21 in the reflecting prism 1023 is 0.2 mm to 0.3 mm. Optionally, after the reflecting prism 1023 is fixed on the package 101, the thickness of the adhesive X between the bottom surface of the reflecting prism 1023 and the package 101 can be less than 50 microns. For example, the distance between the plane M22 in the bottom surface of the reflecting prism 1023 and the bottom plate 1011 is less than 50 microns.

[0034] Exemplarily, when applying the adhesive on the bottom plate by the dispensing process, the thickness of the initially applied adhesive can be set to 30 microns to 50 microns. At this time, when the height of the arc surface of the reflecting prism is less than two - thirds of the height of the heat sink and the length range of the arc surface is 0.2 mm to 0.3 mm, placing the reflecting prism on the adhesive of this thickness and then applying a certain pressure to the reflecting prism can ensure that the arc surface of the reflecting prism can be filled with glue (that is, covered by the adhesive) after squeezing the adhesive under the action of this pressure, but the adhesive does not reach the top of the arc surface, avoiding the influence of the adhesive adhering to the reflective surface on the light - reflecting effect of the reflecting prism.

[0035] Please continue to refer to Figure 3 In the embodiment of the present application, the adhesive X can also cover a partial area of other surfaces that are connected to the bottom surface M2 and different from the reflective surface M1 in the reflecting prism 1032. For example, the other surface includes the target surface M3 opposite to the reflective surface M1 in the reflecting prism 1023, and the other surface can also include the auxiliary surface connecting the reflective surface M1 and the target surface M3 in the reflecting prism 1023. Optionally, the adhesive can cover a partial area of each other surface, or can also only cover a partial area of one or two other surfaces, which is not limited in the embodiment of the present application. In this way, the contact area between the reflecting prism and the adhesive is further increased, and the fixing effect of the reflecting prism is improved. Optionally, if the side where the reflective surface of the reflecting prism is located is called the front end of the reflecting prism, then the side where the target surface of the reflecting prism is located is the rear end of the reflecting prism. The adhesive covering a partial area of the target surface can be called the rear - end glue overflow of the reflecting prism. The side where the auxiliary surface connecting the reflective surface and the target surface in the reflecting prism is located can be called the left end or the right end of the reflecting prism, and the adhesive covering a partial area of the auxiliary surface can be called the left - end or right - end glue overflow of the reflecting prism.

[0036] In the embodiment of the present application, the angle formed by the reflective surface in the reflecting prism and the plane in the bottom surface is an acute angle, and the angle formed by the reflective surface and the bottom plate is also an acute angle. Exemplarily, the angle formed by the reflective surface M1 in the reflecting prism 1023 and the plane M22 in the bottom surface M2 can be 45 degrees, so that the laser emitted by the light - emitting chip 1021 in the direction parallel to the bottom plate can be reflected by this reflective surface and then emitted from the package.

[0037] In the embodiments of the present application, the angle formed by other surfaces in the reflection prism and this plane in the bottom surface can be a right angle or an acute angle. Exemplarily, please continue to refer to Figure 3 , the reflection prism 1023 can be a right prism. The angle formed by the target surface M3 in the reflection prism 1023 and this plane M22 can be a right angle, and the angle formed by the auxiliary surface and this plane M22 can also be a right angle. Also exemplarily, Figure 4 is a schematic structural diagram of another laser provided by the embodiments of the present application. As Figure 4 shown, the reflection prism 1023 can also be a trapezoidal prism. The angle formed by the target surface M3 in the reflection prism 1023 and this plane M22 can be an acute angle, and the angle formed by the auxiliary surface and this plane M22 can also be an acute angle. Since the most important part in the reflection prism is the reflecting surface therein, after the reflection prism is fixed, ensuring that the laser emitted by the light-emitting chip can be incident on the reflecting surface at a set angle can achieve the reflection function of the reflection prism on the laser, and the angles between other surfaces in the reflection prism and the bottom surface can be set arbitrarily. In the embodiments of the present application, the angle formed by this other surface and the plane in the bottom surface is a right angle or an acute angle, which can ensure that the bottom surface area of the reflection prism is larger and the center of gravity is lower, thus ensuring the setting stability of the reflection prism.

[0038] Please continue to refer to Figure 4 , other surfaces in the reflection prism 1023 (such as the target surface M3) can be directly connected to this plane M22, that is, only the connection part between the bottom surface and the reflecting surface of the reflection prism 1023 is arc-shaped, and the connection part between the bottom surface and other surfaces is a sharp angle, such as only one side of the bottom surface of the reflection prism is an arc surface. Optionally, Figure 5 is a schematic structural diagram of yet another laser provided by the embodiments of the present application. As Figure 5 shown, the connection part between the bottom surface M2 of the reflection prism 1023 and other surfaces (such as the target surface M3) is also arc-shaped. For example, the bottom surface M2 of the reflection prism 1023 can further include an auxiliary arc surface M23, and this auxiliary arc surface M23 is used to connect the plane M22 and other surfaces of the reflection prism 1023. Figure 5 Only the auxiliary arc surface M23 connecting the plane M22 and the target surface M3 is shown in . Optionally, the bottom surface of the reflection prism can further include an auxiliary arc surface connected to the auxiliary surface, that is, all four sides of the bottom surface of the reflection prism can be arc surfaces, which is not limited in the embodiments of the present application. In this way, compared with the way that the connection part between the bottom surface and other surfaces is a sharp angle, the existence of the auxiliary arc surface can make the area of this connection part larger, and then the adhesive covering this connection part can increase the contact area between the reflection prism and the adhesive, further improving the setting firmness of the reflection prism.

[0039] Optionally, when an auxiliary arc surface is included on the bottom surface of the reflection prism, the adhesive can only cover the bottom surface and no longer cover other surfaces, or it can still cover some areas of other surfaces. This application embodiment does not make a limitation.

[0040] It should be noted that different adhesives have corresponding characteristics. For example, the adhesion coefficients of different adhesives are different, and the adhesion coefficient of the adhesive can reflect the viscosity or adhesive force of the adhesive. For the reflection prism, after it is fixed on the package, it is required that the upper limit value of the shear force it can withstand is greater than the shear force threshold value. The upper limit value of the shear force that the reflection prism can withstand can reflect its setting firmness on the package. When the reflection prism is fixed in position with a certain adhesive, the shear force D that the reflection prism can withstand is related to the adhesion coefficient K of the adhesive and the contact area S between the reflection prism and the adhesive, D = K * S. In the embodiments of this application, the adhesive and the reflection prism can be appropriately selected according to the shear force threshold value that the reflection prism needs to meet. For example, the bottom surface size of the reflection prism can be designed accordingly after determining the adhesive to be used, or a suitable adhesive can be selected after determining the bottom surface size of the reflection prism. In the embodiments of this application, compared with the related art, the adhesion area between the reflection prism and the adhesive can be increased. Therefore, when using an adhesive with the same adhesion coefficient as in the related art, the volume of the reflection prism can be appropriately reduced, which is beneficial to the miniaturization of the laser.

[0041] Optionally, the distance between the heat sink and the reflection prism can be less than 1 mm. One end of the light-emitting chip close to the reflection prism can extend beyond one end of the heat sink close to the reflection prism. Since the laser emitted by the light-emitting chip has a divergence angle, in this way, the distance between the light-emitting chip and the reflecting surface of the reflection prism can be reduced, avoiding the laser waste caused by the laser emitted by the light-emitting chip shooting outside the reflecting surface, and improving the light-emitting efficiency of the laser.

[0042] In the embodiments of this application, the heat sink can also be fixed on the bottom plate with an adhesive. Optionally, the connection between the bottom surface of the heat sink and the surface close to the reflection prism can also be arc-shaped. Based on the same principle as the connection between the bottom surface and the reflecting surface of the reflection prism being arc-shaped, setting the heat sink in this way can avoid the adhesive on the bottom surface of the heat sink from spreading to the light-emitting chip, resulting in an impact on the light-emitting effect of the light-emitting chip and ensuring the light-emitting effect of the light-emitting chip.

[0043] Optionally, the laser in the embodiments of this application can be a monochromatic laser that can only emit laser of one color. For example, the light-emitting chips in each light-emitting component in the laser all emit laser of the same color. Or, the laser can also be a multi-color laser that can emit lasers of multiple colors. For example, the light-emitting chip in the first light-emitting component in the laser is used to emit red laser, the light-emitting chip in the second light-emitting component is used to emit green laser, and the light-emitting chip in the third light-emitting component is used to emit blue laser.

[0044] Figure 6 It is a schematic exploded view of a laser provided by an embodiment of the present application, Figure 3 which can be Figure 6 a schematic diagram of the cross-section b-b' of the laser shown in the figure. Please continue to refer to Figures 3 to 6 , the laser 10 may further include: a sealing cover plate 103, a light-transmitting sealing layer 104, and a collimating lens group 105. The sealing cover plate 103, the light-transmitting sealing layer 104, and the collimating lens group 105 can cover the opening of the tube shell 101. The sealing cover plate 103 is annular, and the outer edge of the sealing cover plate 103 is fixed to the side where the opening of the tube shell 101 is located, such as being fixed to the surface of the side wall 1012 of the tube shell 101 away from the bottom plate 1011. The inner edge of the sealing cover plate 103 is recessed towards the bottom plate 1011 relative to the outer edge. The light-transmitting sealing layer 104 is fixed to the inner edge of the sealing cover plate 103, such as the edge of the light-transmitting sealing layer 104 is fixed to the inner edge of the sealing cover plate 103. The edge of the collimating lens group 105 is fixed to the surface of the outer edge of the sealing cover plate 103 away from the tube shell.

[0045] In the embodiment of the present application, the thickness of the outer edge of the sealing cover plate 103 can be less than a preset thickness threshold. The thickness of this outer edge is relatively thin, and this outer edge can be fixed to the surface of the side wall 1012 away from the bottom plate by parallel seam welding technology. The inner edge of the sealing cover plate 103 can be recessed towards the bottom plate 1011 relative to the outer edge. Optionally, the sealing cover plate 103 can be a sheet metal part, and the thickness of each position of the sealing cover plate 103 is the same or approximately the same. The sealing cover plate 103 can be 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 plate provided by the embodiment of the present application.

[0046] It should be noted that when fixing the outer edge of the sealing cover plate 103 to the side wall 1012 of the tube shell 101 by parallel seam welding technology, the sealing cover plate 103 will be first placed on the side of the side wall 1012 of the tube shell 101 away from the bottom plate 1011, and the outer edge of the sealing cover plate 103 is overlapped on the surface of the side wall 1012 of the tube shell 101 away from the bottom plate 1011. Then, a seam welding device needs to be used to heat this outer edge to make the connection position between this outer edge and the side wall 1012 molten, and then weld this outer edge to the side wall 1012 of the tube shell 101. Optionally, before fixing the sealing cover plate 103 to the tube shell 101, the light-transmitting sealing layer 104 can be first fixed to the sealing cover plate 103, such as fixing the edge of the light-transmitting sealing layer 104 to the inner edge of the sealing cover plate 103 through a sealing adhesive.

[0047] In the embodiments of the present application, the collimating lens group 105 is used to collimate the light emitted by the light-emitting components and then emit it. It should be noted that collimating the light means converging the light, so that the divergence angle of the light becomes smaller and closer to parallel light. The collimating lens group 105 may include a plurality of collimating lenses, and the plurality of collimating lenses may correspond one by one to the plurality of light-emitting components in the laser. The light emitted by each light-emitting component may be incident on the corresponding collimating lens, and then be collimated by the collimating lens and emitted. The plurality of collimating lenses in the collimating lens group 105 may be integrally formed. One side of the collimating lens group 105 away from the bottom plate 1011 of the tube shell 101 may have a plurality of convex arc surfaces bent away from the bottom plate 1011. Each part where the convex arc surface is located may serve as a collimating lens, and thus it can be considered that the collimating lens group includes a plurality of collimating lenses.

[0048] In the embodiments of the present application, the light-transmitting sealing layer 104 may be in a plate-like structure. The plate-like structure may include two parallel and larger surfaces and a plurality of smaller side surfaces connecting the two surfaces. The side surfaces of the light-transmitting sealing layer 104 may be fixed to the inner edge of the sealing cover plate 103 through a sealing adhesive (not shown in the figure). In the embodiments of the present application, the light-transmitting sealing layer may be directly fixed to the sealing cover plate, or as Figure 6 shown, the laser may further include an auxiliary support frame 108. The light-transmitting sealing layer 104 may be first fixed to the auxiliary support frame 108, and then the auxiliary support frame 108 is fixed to the sealing cover plate 103. Exemplarily, the auxiliary support frame may be a frame in the shape of a Chinese character "mu", so that the middle area of the light-transmitting sealing layer can be supported by the support frame, thereby improving the setting firmness of the light-transmitting sealing layer. Optionally, at least one of the surface of the light-transmitting sealing layer close to the bottom plate and the surface away from the bottom plate may be attached with a brightness enhancement film to improve the light output brightness of the laser.

[0049] In the embodiments of the present application, the material of the tube shell may be copper, such as oxygen-free copper. The material of the light-transmitting sealing layer may be glass, and the material of the sealing cover plate may be stainless steel. It should be noted that copper has a relatively large thermal conductivity. In the embodiments of the present application, the material of the tube shell is copper, so that the heat generated by the light-emitting components arranged on the bottom plate of the tube shell during operation can be quickly conducted through the tube shell and then dissipated relatively quickly, avoiding damage to the light-emitting components caused by heat accumulation. Optionally, the material of the tube shell may also be one or more of aluminum, aluminum nitride, and silicon carbide. In the embodiments of the present application, the material of the sealing cover plate may also be other kovar materials, such as iron-nickel-cobalt alloy or other alloys. The material of the light-transmitting sealing layer may also be other light-transmitting and highly reliable materials, such as resin materials.

[0050] Optionally, as Figure 6As shown, the side wall 1012 in the package 101 may include a side wall body 1012a and an annular bracket 108 welded to one side of the side wall body 1012a away from the bottom plate 1011. Optionally, the bracket 108 has relatively high rigidity, which can increase the overall rigidity of the laser and reduce the risk of laser damage. Exemplarily, the material of the bracket 108 includes one or more of stainless steel and kovar. Optionally, in the axial direction of the bracket 108, the thickness range of the bracket 108 is 0.5 mm to 1.5 mm. For example, the thickness of the bracket 108 can be 0.5 mm or 1 mm.

[0051] The material of the package 101 can be copper, and the material of the sealing cover plate 103 can be kovar or stainless steel. At this time, since it is difficult to weld kovar and stainless steel to the copper material by parallel seam welding technology, it is difficult to directly weld the sealing cover plate to the package. In the embodiment of the present application, the side wall 1012 includes a side wall main body 1012a and a bracket 1012b, and the material of the bracket 1012b includes one or more of stainless steel and kovar. Thus, the sealing cover plate 103 can be easily welded to the surface of the bracket 1012b away from the bottom plate 1011 by parallel seam welding technology, ensuring the effective fixation of the sealing cover plate on the package 101.

[0052] In the embodiment of the present application, the package 101, the sealing cover plate 103, and the light-transmitting sealing layer 104 can form a closed space so that the light-emitting component 102 can be in the closed space to prevent water and oxygen from eroding the light-emitting component 102.

[0053] Please continue to refer to Figure 6 , opposite sides of the side wall 1012 of the package 101 may have a plurality of openings, and the laser 10 may further include: a plurality of conductive pins 106, and the plurality of conductive pins 106 may respectively pass through the openings in the side wall 1012 and extend into the package 101, and then be fixed to the package 101. The conductive pins 106 can be electrically connected to the electrodes of the light-emitting chips in the light-emitting component to transmit an external power supply to the light-emitting chips, and then stimulate the light-emitting chips to emit light. Optionally, the aperture of the opening can be 1.2 mm, and the diameter of the conductive pin 106 can be 0.55 mm.

[0054] Optionally, when assembling the laser in the embodiments of the present application, a ring-shaped solder structure (such as a ring-shaped glass bead) can be placed in the opening on the side wall of the package first, and the conductive pins are passed through the solder structure and the opening where the solder structure is located. Then, the side wall is placed on the four peripheral edges of the bottom plate, and a ring-shaped silver-copper solder is placed between the bottom plate and the package. Next, the structure of the bottom plate, the side wall, and the conductive pins is placed in a high-temperature furnace for sealing and sintering. After the sealing and sintering and curing, the bottom plate, the side wall, the conductive pins, and the solder can form an integral body, thereby achieving airtightness at the opening of the side wall. The light-transmitting sealing layer and the sealing cover plate can also be fixed, such as the edge of the light-transmitting sealing layer is pasted on the inner edge of the sealing cover plate to obtain an upper cover assembly. Then, each structure in the light-emitting assembly can be welded on the bottom plate in the accommodating space of the package, and then the upper cover assembly is welded on the surface of the side wall of the package away from the bottom plate by using the parallel seam welding technology. Finally, the collimating lens group is fixed on the side of the upper cover assembly away from the bottom plate by epoxy glue, and thus the assembly of the laser is completed. It should be noted that the above assembly process is only an exemplary process provided by the embodiments of the present application, and the welding process used in each step can also be replaced by other processes, and the sequence of each step can also be adjusted accordingly. The embodiments of the present application do not limit this.

[0055] It should be noted that the above embodiments of the present application are described by taking the bottom plate and the side wall of the package as two separate structures to be assembled as an example. Optionally, the bottom plate and the side wall can also be integrally formed. In this way, it is possible to avoid wrinkles on the bottom plate caused by different thermal expansion coefficients of the bottom plate and the side wall during high-temperature welding, thereby ensuring the flatness of the bottom plate, ensuring the setting reliability of the light-emitting assembly on the bottom plate, and ensuring that the light emitted by the light-emitting chip is emitted at a predetermined emission angle, improving the light-emitting effect of the laser.

[0056] In summary, in the laser provided by the embodiments of the present application, the connection between the bottom surface of the reflection prism and the reflective surface is arc-shaped. Thus, when the reflection prism is placed on the adhesive, the area of the bottom surface of the reflection prism outside the connection can first contact the adhesive. When pressing the reflection prism, the adhesive can first spread to the connection between the bottom surface and the reflective surface, and will not directly spread to the reflective surface. And compared with the diffusion speed on a plane, the diffusion speed of the adhesive on the arc-shaped connection is slower. Therefore, it is possible to reduce or even avoid the adhesion of the adhesive on the reflective surface of the reflection prism, ensuring a high reflective effect of the reflective surface, and thus a high light-emitting efficiency of the laser. Moreover, the connection between the bottom surface and the reflective surface being arc-shaped can increase the contact area between the reflection prism and the adhesive, improving the pasting reliability of the reflection prism.

[0057] It should be noted that in the embodiments of the present application, the term "and / or" in the present application is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship. The terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. The term "a plurality" refers to two or more, unless otherwise clearly defined. "Substantially" means within an acceptable error range, and those skilled in the art can solve the technical problem within a certain error range and basically achieve the technical effect. In the drawings, the dimensions of layers and regions may be exaggerated for clarity of illustration. Moreover, it can be 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 an intermediate layer. Like reference numerals throughout indicate like elements.

[0058] The foregoing are only optional embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A laser, characterized in that, The laser includes: a housing and a plurality of light-emitting components, and the plurality of light-emitting components are located in the accommodating space of the housing; Each of the light-emitting components includes: a light-emitting chip, a heat sink, and a reflecting prism; the heat sink and the reflecting prism are both fixed on the housing, the light-emitting chip is fixed on the heat sink, the reflecting prism is located on the light-emitting side of the light-emitting chip, and the reflecting prism has a bottom surface and a reflecting surface connected to each other; the light-emitting chip is configured to emit laser light to the reflecting surface of the reflecting prism, and the reflecting surface is configured to reflect the incident laser light; Wherein, the reflecting prism is fixed on the housing by an adhesive covering the bottom surface; The bottom surface includes: an arc surface and a flat surface connected to each other, and the arc surface is connected to the reflecting surface; in a direction perpendicular to the flat surface, the height of the arc surface is less than two-thirds of the height of the heat sink, so that the laser light emitted by the light-emitting chip is directed to the reflecting surface; In the arrangement direction of the light-emitting chip and the reflecting prism, the length range of the arc surface is 0.2 mm to 0.3 mm; The thickness of the adhesive between the bottom surface of the reflecting prism and the housing is less than 50 microns.

2. The laser according to claim 1, characterized in that, The arc surface is a circular arc surface.

3. The laser according to claim 1, characterized in that, The angle formed by the other surface of the reflecting prism and the flat surface is an acute angle or a right angle, and the other surface is the surface of the reflecting prism that is connected to the bottom surface and is different from the reflecting surface.

4. The laser according to claim 3, characterized in that, The bottom surface further includes: an auxiliary arc surface connecting the flat surface and the other surface.

5. The laser according to claim 3 or 4, characterized in that, The adhesive also covers a partial area of the other surface.

6. The laser according to claim 1 or 2, characterized in that, The distance between the heat sink and the reflecting prism is less than 1 mm.

Images