Blue light laser engraving device

Abstract

The utility model discloses a blue light laser engraving device which sequentially comprises a blue light laser emission source set, a polarization light combination lens set, a composite lens assembly and a space stacking lens along the propagation path of blue light. The blue laser emission source group is used for emitting blue light, and the blue light passes through the polarization light combination lens group, the composite lens assembly, the space stacking lens, the dichroic sheet and the focusing lens in sequence; the compound lens assembly comprises a slow axis adjusting lens group and a fast axis adjusting lens group, and the focusing lens focuses blue light. According to the scheme, the emission angles of the fast axis and the slow axis are adjusted through the slow axis adjusting lens group and the fast axis adjusting lens group. Wherein the slow axis adjusting lens group can adjust the divergence angle of the slow axis, and the fast axis adjusting lens group can adjust the divergence angle of the fast axis, so that the divergence angles in the two directions of the fast axis and the slow axis are reduced to be within 1mrad, the quality of light spots can be obviously improved, and the problem that long-strip-shaped light spots appear on the blue light laser engraving device is solved; and the engraving quality is poor due to poor light spot quality.

Description

Technical Field

[0001] The utility model relates to the technical field of laser engraving, in particular to a blue light laser engraving device. Background Art

[0002] In existing laser engraving devices, the blue laser emission source plays a vital role as its core component. However, the blue light emitted by the blue light emitter is not uniform, but has two distinct different directions: the fast axis and the slow axis. There is a significant difference in the divergence angles in these two directions, where the divergence angle in the slow axis direction is usually much larger than the emission angle in the fast axis direction. This inconsistency in the divergence angle poses a considerable challenge to the performance and application effect of the laser engraving device.

[0003] When the blue laser source is used for focusing directly, the light spot at the focal position often presents a long strip shape due to the different divergence angles of the fast and slow axes. This not only affects the uniformity and quality of the light spot, but may also lead to poor engraving effects and distorted details. Utility Model Content

[0004] In view of the above defects, the utility model proposes a blue light laser engraving device. The scheme adjusts the emission angles of the fast axis and the slow axis through the slow axis adjustment lens group and the fast axis adjustment lens group. The slow axis adjustment lens group can adjust the divergence angle of the slow axis, and the fast axis adjustment lens group can adjust the divergence angle of the fast axis, so that the divergence angles in both directions of the fast axis and the slow axis are reduced to within 1 mrad, which can significantly improve the quality of the light spot and solve the problem that the blue light laser engraving device has a long light spot and poor light spot quality leads to poor engraving quality.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] A blue light laser engraving device includes a blue light laser emission source group, a polarized light combining lens group, a composite lens assembly and a space stacking lens in sequence along the propagation path of the blue light;

[0007] The blue laser emission source group is used to emit blue light, and the blue light passes through the polarized light combining lens group, the composite lens assembly, the spatial stacking lens, the dichroic film and the focusing lens in sequence;

[0008] The polarized light combining lens group is used for the polarization state of blue light, the composite lens assembly includes a slow axis adjustment lens group and a fast axis adjustment lens group, the slow axis adjustment lens group is used to adjust the slow axis divergence angle of blue light, the fast axis adjustment lens group is used to adjust the fast axis divergence angle of blue light, the spatial stacking lens is used to reflect the blue light to the dichroic film, the dichroic film is used to reflect the blue light, and the focusing lens focuses the blue light.

[0009] Furthermore, the slow-axis adjustment lens group includes a first plano-concave cylindrical mirror and a first plano-convex cylindrical mirror in sequence along the propagation path of the blue light, the first plano-concave cylindrical mirror and the first plano-convex cylindrical mirror are both vertically arranged, and the center of the first plano-concave cylindrical mirror and the center of the first plano-convex cylindrical mirror are both located on the same horizontal line.

[0010] Furthermore, the fast axis adjustment lens group includes a second plano-convex cylindrical mirror and a second plano-concave cylindrical mirror in sequence along the propagation path of the blue light, and the second plano-concave cylindrical mirror and the second plano-convex cylindrical mirror are both located between the first plano-concave cylindrical mirror and the first plano-convex cylindrical mirror;

[0011] The second plano-convex cylindrical mirror and the second plano-concave cylindrical mirror are both arranged vertically, and the center of the first plano-concave cylindrical mirror, the center of the first plano-convex cylindrical mirror, the center of the second plano-convex cylindrical mirror and the center of the second plano-concave cylindrical mirror are all located on the same horizontal line.

[0012] Further, the blue laser emission source group includes a first blue light emitter and a second blue light emitter in a horizontal manner from top to bottom;

[0013] The polarized light combining lens group includes a half-wave plate, a blue light reflecting plate and a polarizer. The center of the first blue light emitter, the center of the half-wave plate and the center of the blue light reflecting plate are all located on the same horizontal line. The half-wave plate is vertically installed at the output end of the first blue light emitter. The top of the half-wave plate forms an angle of 45° with the blue light reflecting plate.

[0014] The center of the second blue light emitter and the center of the polarizer are located on the same horizontal line, the polarizer is obliquely installed at the output end of the first blue light reflector, the polarizer and the blue light reflector are arranged parallel to each other, and the light transmission axis of the polarizer is in the horizontal direction;

[0015] The first blue light passes through a half-wave plate, a blue light reflecting plate, a composite lens assembly, a spatially stacked lens, a dichroic plate and a focusing lens in sequence; the second blue light passes through a polarizing plate, a composite lens assembly, a spatially stacked lens, a dichroic plate and a focusing lens in sequence.

[0016] Furthermore, at least two blue light laser modules are provided, and the polarized light combining lens groups of two adjacent blue light laser modules are symmetrically arranged about the horizontal axis.

[0017] Furthermore, the spatially stacked lens is arranged perpendicular to the polarizing film, and the spatially stacked lens and the dichroic film are arranged parallel to each other.

[0018] Furthermore, the center of the focusing lens and the center of the dichroic film are located on the same horizontal line, and the focusing lens is arranged vertically.

[0019] The technical solution provided by the embodiments of the present application may have the following beneficial effects:

[0020] 1. The blue laser emission source group emits blue light outward, the polarized light combining lens group can change the polarization state of the blue light, the composite lens assembly can adjust the divergence angles of the fast axis and the slow axis in the blue light, and the spatial stacking lens reflects the adjusted blue light onto the dichroic film. At this time, the dichroic film reflects the blue light, so that the blue light is reflected onto the focusing lens and focused on the focusing lens to form a light spot, thereby achieving the effect of fast and precise engraving of various materials.

[0021] 2. In order to improve the problem of long strips of light spots in blue laser engraving devices, this solution adjusts the emission angles of the fast axis and the slow axis through the slow axis adjustment lens group and the fast axis adjustment lens group. The slow axis adjustment lens group can adjust the divergence angle of the slow axis, and the fast axis adjustment lens group can adjust the divergence angle of the fast axis, so that the divergence angles in both the fast axis and the slow axis are reduced to within 1mrad, which can significantly improve the quality of the light spot and solve the problem of long strips of light spots in blue laser engraving devices and poor engraving quality caused by poor light spot quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of a blue light laser engraving device according to an embodiment of the utility model;

[0023] Figure 2 is a schematic diagram of a blue light laser engraving device according to another embodiment of the utility model;

[0024] Among them, 1. blue laser emission source group; 11. first blue light emitter; 12. second blue light emitter; 2. polarized light combining lens group; 21. half-wave plate; 22. blue light reflector; 23. polarizer; 3. composite lens assembly; 31. slow axis adjustment lens group; 311. first plano-concave cylindrical mirror; 312. first plano-convex cylindrical mirror; 32. fast axis adjustment lens group; 321. second plano-convex cylindrical mirror; 322. second plano-concave cylindrical mirror; 4. spatial stacking lens; 5. dichroic film; 6. focusing lens. DETAILED DESCRIPTION

[0025] The technical solution of the utility model is further explained below with reference to the accompanying drawings and through specific implementation methods.

[0026] In the description of the present invention, it should be understood that the terms "length", "middle", "upper", "lower", "left", "right", "top", "bottom", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0027] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, the meaning of "plurality" is more than two.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "splicing", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] Combine the following Figure 1 to Figure 2 , describing a blue light laser engraving device according to an embodiment of the utility model.

[0030] A blue light laser engraving device comprises a blue light laser emission source group 1, a polarized light combining lens group 2, a composite lens assembly 3 and a space stacking lens 4 in sequence along the propagation path of the blue light;

[0031] The blue laser emission source group 1 is used to emit blue light, and the blue light passes through the polarized light combining lens group 2, the composite lens assembly 3, the spatial stacking lens 4, the dichroic film 5 and the focusing lens 6 in sequence;

[0032] The polarized light combining lens group 2 is used for the polarization state of blue light, the composite lens assembly 3 includes a slow axis adjustment lens group 31 and a fast axis adjustment lens group 32, the slow axis adjustment lens group 31 is used to adjust the slow axis divergence angle of the blue light, the fast axis adjustment lens group 32 is used to adjust the fast axis divergence angle of the blue light, the spatial stacking lens 4 is used to reflect the blue light to the dichroic film 5, the dichroic film 5 is used to reflect the blue light, and the focusing lens 6 focuses the blue light.

[0033] In the present scheme, a blue laser engraving device is provided, wherein a blue laser emission source group 1 emits blue light, a polarized light combining lens group 2 can change the polarization state of the blue light, a composite lens assembly 3 can adjust the divergence angles of the fast axis and the slow axis in the blue light, and a spatial stacking lens 4 reflects the adjusted blue light onto a dichroic film 5. At this time, the dichroic film 5 reflects the blue light, so that the blue light is reflected onto a focusing lens 6, and is focused on the focusing lens 6 to form a light spot, thereby achieving the effect of fast and accurate engraving of various materials.

[0034] In addition, in order to improve the problem of long strips of light spots in the blue laser engraving device, the present solution adjusts the emission angles of the fast axis and the slow axis through the slow axis adjustment lens group 31 and the fast axis adjustment lens group 32. The slow axis adjustment lens group 31 can adjust the divergence angle of the slow axis, and the fast axis adjustment lens group 32 can adjust the divergence angle of the fast axis, so that the divergence angles in both the fast axis and the slow axis are reduced to within 1 mrad, which can significantly improve the quality of the light spot and solve the problem of long strips of light spots in the blue laser engraving device and poor engraving quality caused by poor light spot quality.

[0035] The slow axis adjustment lens group 31 includes a first plano-concave cylindrical mirror 311 and a first plano-convex cylindrical mirror 312 in sequence along the propagation path of the blue light. The first plano-concave cylindrical mirror 311 and the first plano-convex cylindrical mirror 312 are both vertically arranged, and the center of the first plano-concave cylindrical mirror 311 and the center of the first plano-convex cylindrical mirror 312 are both located on the same horizontal line.

[0036] The first plano-concave cylindrical mirror 311 and the first plano-convex cylindrical mirror 312 are both vertically arranged, and the center of the first plano-concave cylindrical mirror 311 and the center of the first plano-convex cylindrical mirror 312 are both located on the same horizontal line, which can ensure that the blue light can pass through the first plano-concave cylindrical mirror 311 and the second plano-convex cylindrical mirror 321 in sequence, thereby adjusting the slow-axis divergence angle of the blue light.

[0037] The fast axis adjustment lens group 32 includes a second plano-convex cylindrical mirror 321 and a second plano-concave cylindrical mirror 322 in sequence along the propagation path of the blue light, wherein the second plano-concave cylindrical mirror 322 and the second plano-convex cylindrical mirror 321 are both located between the first plano-concave cylindrical mirror 311 and the first plano-convex cylindrical mirror 312;

[0038] The second plano-convex cylindrical mirror 321 and the second plano-concave cylindrical mirror 322 are both vertically arranged, and the center of the first plano-concave cylindrical mirror 311, the center of the first plano-convex cylindrical mirror 312, the center of the second plano-convex cylindrical mirror 321 and the center of the second plano-concave cylindrical mirror 322 are all located on the same horizontal line.

[0039] The fast axis divergence angle of the second blue light can be adjusted by the blue light passing through the second plano-concave cylindrical mirror 322 and the second plano-convex cylindrical mirror 321 in sequence.

[0040] The first plano-concave cylindrical mirror 311, the second plano-convex cylindrical mirror 321, the second plano-concave cylindrical mirror 322 and the first plano-convex cylindrical mirror 312 are arranged in sequence along the propagation direction of the blue light, and the positions and installation angles of the first plano-concave cylindrical mirror, the second plano-convex cylindrical mirror 321, the second plano-concave cylindrical mirror 322 and the first plano-convex cylindrical mirror 312 are restricted, which can ensure that the blue light can pass through the composite lens assembly 3 smoothly.

[0041] The staff can adjust the distance between the two according to the shape of the light spot, and can accurately adjust the divergence angles of the slow axis and the fast axis, so that the divergence angles in both the fast axis and the slow axis are reduced to within 1 mrad, further improving the light spot quality and the beam Rayleigh distance of the blue light engraving laser device of this scheme.

[0042] The blue laser emission source group 1 includes a first blue light emitter 11 and a second blue light emitter 12 in sequence from top to bottom;

[0043] The polarized light combining lens set 2 comprises a half-wave plate 21, a blue light reflecting plate 22 and a polarizer 23. The center of the first blue light emitter 11, the center of the half-wave plate 21 and the center of the blue light reflecting plate 22 are all located on the same horizontal line. The half-wave plate 21 is vertically installed at the output end of the first blue light emitter 11. The top of the half-wave plate 21 forms an angle of 45° with the blue light reflecting plate 22.

[0044] The center of the second blue light emitter 12 and the center of the polarizer 23 are located on the same horizontal line, the polarizer 23 is obliquely installed at the output end of the first blue light reflector, the polarizer 23 and the blue light reflector 22 are arranged parallel to each other, and the light transmission axis of the polarizer 23 is in the horizontal direction;

[0045] The first blue light passes through the half-wave plate 21, the blue light reflecting plate 22, the compound lens assembly 3, the spatially stacked lens 4, the dichroic plate 5 and the focusing lens 6 in sequence; the second blue light passes through the polarizing plate 23, the compound lens assembly 3, the spatially stacked lens 4, the dichroic plate 5 and the focusing lens 6 in sequence.

[0046] The first blue light emitter 11 emits the first blue light with a horizontal propagation direction outward, and the first blue light first passes through the vertical half-wave plate 21, at which time the half-wave plate 21 changes the polarization state of the first blue light, and then the first blue light is reflected on the blue light reflector 22. Since the blue light reflector 22 is tilted and forms a 45° angle with the top of the half-wave plate 21, the propagation direction of the first blue light is vertical and perpendicular to the light transmission axis of the polarizer 23. Therefore, when the first blue light is reflected by the reflector lens and reaches the polarizer 23, it no longer passes through the polarizer 23, but is reflected on the polarizer 23. The polarizer 23 and the blue light reflector 22 are parallel to each other, so after the first blue light is reflected by the polarizer 23, the propagation direction is horizontal.

[0047] The second blue light emitter 12 is located below the first blue light emitter 11. The second blue light emitter 12 emits the second blue light with a horizontal propagation direction outward. At this time, the propagation direction of the first blue light and the propagation direction of the second blue light are parallel to each other. The second blue light first passes through the polarizer 23. Since the light transmission axis of the polarizer 23 is in the horizontal direction, the second blue light passes through the polarizer 23 horizontally and overlaps with the first blue light.

[0048] There are at least two blue light laser modules, and the polarized light combining lens groups 2 of two adjacent blue light laser modules are symmetrically arranged along the horizontal axis.

[0049] It should be noted that the blue laser module of the present solution may be provided with one or more. In another embodiment of the present solution, two vertically arranged blue laser modules are provided, which can improve the intensity of the laser beam of the blue light engraving laser device of the present solution and achieve the effect of fast and precise processing of various materials.

[0050] Among them, the two polarized light-combining lens groups 2 are symmetrically arranged about the horizontal axis, which can accurately control the propagation direction of the blue light, ensuring that the blue light can pass through the polarized light-combining lens group 2, the composite lens assembly 3, the spatially stacked lens 4, the dichroic mirror and the focusing lens 6 in sequence, and then gather together to achieve the effect of laser engraving.

[0051] The spatial stacking lens 4 is arranged perpendicular to the polarizing film 23 , and the spatial stacking lens 4 and the dichroic film 5 are arranged parallel to each other.

[0052] It is worth noting that each of the multiple blue laser modules is provided with an inclined spatial stacking lens 4. The spatial stacking lens 4 is vertically arranged with the polarizing plate 23, and the center of the spatial stacking lens 4 is located on the same horizontal line as the center of the polarizing plate 23. Therefore, the blue light passing through the composite lens assembly 3 can be reflected on the spatial stacking lens 4, and the propagation direction is upward at this time, and passes through the dichroic plate 5. The dichroic plate 5 reflects the blue light, and the dichroic plate 5 and the spatial stacking lens 4 are parallel to each other, so that the blue light is focused horizontally through the focusing lens 6 after being reflected by the dichroic plate 5.

[0053] When the number of blue light laser modules is greater than one, the spatial stacking lens 4 can reflect the blue light emitted by the corresponding blue light laser module, so that multiple blue lights are respectively reflected by the corresponding spatial stacking lens 4 and reflected on the dichroic film 5 together, ensuring that the blue lights emitted by multiple blue light laser modules can be gathered.

[0054] The center of the focusing lens 6 and the center of the dichroic film 5 are located on the same horizontal line, and the focusing lens 6 is arranged vertically.

[0055] The vertical blue light is reflected on the dichroic film 5, which is tilted at 45 degrees, so that the propagation direction of the blue light is changed to the horizontal direction. At this time, the propagation direction of the blue light is perpendicular to the focusing lens 6, and the blue light is perpendicular to the focusing lens 6 and is focused on the focusing lens 6 to form a light beam.

[0056] The technical principle of the present invention is described above in combination with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the protection scope of the present invention in any way. Based on the explanations here, technicians in this field can think of other specific implementation methods of the present invention without creative work, and these methods will fall within the protection scope of the present invention.

Claims

1. A blue light laser engraving device, characterized in that: Along the propagation path of the blue light, it includes a blue light laser emission source group, a polarized light combining lens group, a composite lens assembly and a spatial stacking lens in sequence; The blue laser emission source group is used to emit blue light, and the blue light passes through the polarized light combining lens group, the composite lens assembly, the spatial stacking lens, the dichroic film and the focusing lens in sequence; The polarized light combining lens group is used for the polarization state of blue light, the composite lens assembly includes a slow axis adjustment lens group and a fast axis adjustment lens group, the slow axis adjustment lens group is used to adjust the slow axis divergence angle of blue light, the fast axis adjustment lens group is used to adjust the fast axis divergence angle of blue light, the spatial stacking lens is used to reflect the blue light to the dichroic film, the dichroic film is used to reflect the blue light, and the focusing lens focuses the blue light.

2. A blue light laser engraving device according to claim 1, characterized in that: The slow axis adjustment lens group includes a first plano-concave cylindrical mirror and a first plano-convex cylindrical mirror in sequence along the propagation path of the blue light. The first plano-concave cylindrical mirror and the first plano-convex cylindrical mirror are both vertically arranged, and the centers of the first plano-concave cylindrical mirror and the centers of the first plano-convex cylindrical mirror are both located on the same horizontal line.

3. A blue light laser engraving device according to claim 2, characterized in that: The fast axis adjustment lens group includes a second plano-convex cylindrical mirror and a second plano-concave cylindrical mirror in sequence along the propagation path of the blue light, and the second plano-concave cylindrical mirror and the second plano-convex cylindrical mirror are both located between the first plano-concave cylindrical mirror and the first plano-convex cylindrical mirror; The second plano-convex cylindrical mirror and the second plano-concave cylindrical mirror are both arranged vertically, and the center of the first plano-concave cylindrical mirror, the center of the first plano-convex cylindrical mirror, the center of the second plano-convex cylindrical mirror and the center of the second plano-concave cylindrical mirror are all located on the same horizontal line.

4. The blue light laser engraving device according to claim 1, characterized in that: The blue laser emission source group includes, from top to bottom, a first horizontal blue light emitter and a second horizontal blue light emitter; The polarized light combining lens group includes a half-wave plate, a blue light reflecting plate and a polarizer. The center of the first blue light emitter, the center of the half-wave plate and the center of the blue light reflecting plate are all located on the same horizontal line. The half-wave plate is vertically installed at the output end of the first blue light emitter. The top of the half-wave plate forms an angle of 45° with the blue light reflecting plate. The center of the second blue light emitter and the center of the polarizer are located on the same horizontal line, the polarizer is obliquely installed at the output end of the first blue light reflector, the polarizer and the blue light reflector are arranged parallel to each other, and the light transmission axis of the polarizer is in the horizontal direction; The first blue light passes through a half-wave plate, a blue light reflecting plate, a composite lens assembly, a spatially stacked lens, a dichroic plate and a focusing lens in sequence; the second blue light passes through a polarizing plate, a composite lens assembly, a spatially stacked lens, a dichroic plate and a focusing lens in sequence.

5. The blue light laser engraving device according to claim 1, characterized in that: There are at least two blue light laser modules, and the polarized light combining lens groups of two adjacent blue light laser modules are symmetrically arranged along the horizontal axis.

6. The blue light laser engraving device according to claim 4, characterized in that: The spatial stacking lens is arranged perpendicularly to the polarizing film, and the spatial stacking lens and the dichroic film are arranged parallel to each other.

7. The blue light laser engraving device according to claim 4, characterized in that: The center of the focusing lens and the center of the dichroic film are located on the same horizontal line, and the focusing lens is arranged vertically.

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