Optical system for 3D printing and 3D printing equipment

Abstract

The utility model discloses an optical system for 3D printing. The optical system comprises a light source, a collimating lens, a beam expanding lens set, a galvanometer module and a field lens, wherein the wavelength of a light beam generated by the light source is 450 nm, and the collimating lens is an aspheric biconvex lens. By adopting the optical system, the light beam generated by the light source is collimated by the collimating lens and then enters the beam expanding lens group, the beam expanding lens group expands the light beam and then enters the galvanometer module, and the galvanometer module and the field lens are matched to focus the light beam on a working surface. Due to the fact that the wavelength of the light beam generated by the light source is 450 nm, the absorption effect of the metal material on the 450 nm is better, and the machining efficiency can be effectively improved. Meanwhile, the collimating lens adopts an aspheric biconvex lens, so that the collimating effect can be improved, the subsequent light beam focusing effect is improved, and the processing effect is improved. The utility model further discloses 3D printing equipment.

Description

Technical Field

[0001] The present application belongs to the technical field of 3D printing equipment, and specifically relates to an optical system and 3D printing equipment for 3D printing. Background Art

[0002] Currently, the mainstream laser optical systems used in laser welding, cutting, and 3D printing equipment utilize a 1064nm infrared fiber laser, coupled with a galvanometer and field lens suitable for the corresponding wavelength to achieve these functions. For example, 3D printing often uses metal powder as a processing material, but 1064nm laser light is not the optimal wavelength for metal to absorb light energy, resulting in low processing efficiency. Utility Model Content

[0003] The technical problem to be solved by this application is that the existing 3D printing equipment has low processing efficiency. In order to solve the above technical problem, an optical system and 3D printing equipment for 3D printing with high processing efficiency are provided.

[0004] The technical solutions proposed in this application are:

[0005] An optical system for 3D printing, comprising a light source and a collimating lens, a beam expander lens group, a galvanometer module and a field lens arranged in sequence along the light path;

[0006] The wavelength of the light beam generated by the light source is 450 nm, and the collimating lens is an aspherical biconvex lens.

[0007] Furthermore, the light beam generated by the light source includes a light beam in a first direction and a light beam in a second direction, and a divergence angle of the light beam in the first direction is smaller than a divergence angle of the light beam in the second direction.

[0008] Furthermore, the light beam in the first direction is a multimode light beam, and the light beam in the second direction is a fundamental mode Gaussian light beam.

[0009] Furthermore, the galvanometer module includes a first reflector and a second reflector, the first reflector is used to reflect the light beam to the second reflector, and the second reflector is used to reflect the light beam to the field mirror.

[0010] Furthermore, the galvanometer module also includes a first swinging drive component and a second swinging drive component, the first swinging drive component is connected to the first reflector, and the second swinging drive component is connected to the second reflector to drive the first reflector and the second reflector to swing in two different directions respectively.

[0011] Furthermore, the beam expander lens group includes a first beam expander lens and a second beam expander lens arranged in sequence along the optical path direction, the first beam expander lens is a meniscus negative lens, the second beam expander lens is a positive lens, and the focal lengths of the first beam expander lens and the second beam expander lens are different.

[0012] Furthermore, the first beam expanding lens and the second beam expanding lens are both cylindrical lenses, and the light-entering surface of the first beam expanding lens is a curved surface and the light-emitting surface is a flat surface, while the light-entering surface of the second beam expanding lens is a flat surface and the light-emitting surface is a curved surface.

[0013] A 3D printing device includes the optical system for 3D printing as described above.

[0014] Using the above-mentioned optical system, the light beam generated by the light source is collimated by the collimating lens and then incident on the beam expander. The beam expander expands the beam and then incident on the galvanometer module. The galvanometer module and the field lens work together to focus the beam on the work surface. Since the wavelength of the light beam generated by the light source is 450nm, metal materials have a better absorption effect on 450nm, which can effectively improve processing efficiency. At the same time, the collimating lens uses an aspheric biconvex lens, which can improve the collimation effect and enhance the subsequent beam focusing effect, thereby improving the processing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings are used to provide further understanding of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation of the present application.

[0016] Figure 1 A schematic structural diagram of an optical system for 3D printing provided in one embodiment of the present application;

[0017] Figure 2 for Figure 1 Schematic diagram of the structure of the galvanometer module in the optical system shown.

[0018] Description of labels:

[0019] 110. Light source; 120. Collimating lens; 130. Beam expander lens assembly; 131. First beam expander lens; 132. Second beam expander lens; 140. Galvanometer module; 141. First reflector; 142. Second reflector; 143. Mounting base; 150. Field lens. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0021] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on this application.

[0022] On the one hand, the present application provides an optical system for 3D printing, which can improve processing efficiency during the 3D printing process.

[0023] like Figure 1 As shown, the optical system includes a light source 110 and a collimating lens 120, a beam expander 130, a galvanometer module 140 and a field lens 150 arranged in sequence along the optical path. The wavelength of the light beam generated by the light source 110 is 450nm, and the collimating lens 120 is an aspherical biconvex lens.

[0024] Using the above-mentioned optical system, the light beam generated by the light source 110 is collimated by the collimating lens 120 and then incident on the beam expander assembly 130. The beam expander assembly 130 expands the light beam and then incident on the galvanometer module 140. The galvanometer module 140 and the field lens 150 cooperate to focus the light beam on the working surface. Since the wavelength of the light beam generated by the light source 110 is 450nm, metal materials have a better absorption effect on 450nm, which can effectively improve the processing efficiency. At the same time, the collimating lens 120 uses an aspheric biconvex lens, which can improve the collimation effect and achieve an improved focusing effect on the subsequent light beam, thereby improving the processing effect.

[0025] In addition, it should be further explained that, by using the light source 110 with a wavelength of 450 nm, the volume of the light source 110 is smaller, thereby reducing the volume of the optical system.

[0026] In one embodiment, the light beam generated by the light source 110 includes a light beam in a first direction and a light beam in a second direction, and the divergence angle of the light beam in the first direction is smaller than the divergence angle of the light beam in the second direction. It should be noted that in the collimation stage, the divergence angle of the light beam in the second direction is relatively large. If a spherical lens is used, a large spherical aberration will be generated. Therefore, an aspherical biconvex lens is used to eliminate the spherical aberration, reduce the size of the diffuse spot to make it smaller than the size of the Airy disk, and improve the collimation effect. In the beam expansion stage, the beam expansion lens group 130 mainly expands the light beam in the first direction. After the beam expansion is completed, the divergence angle of the light beam in the first direction can be made consistent with the divergence angle of the light beam in the second direction, thereby ensuring that the subsequent focused light spot is consistent in size in the two directions and ensuring a better processing effect.

[0027] In practical applications, the light beam in the first direction is a multimode light beam, and the light beam in the second direction is a fundamental mode Gaussian light beam.

[0028] In one embodiment, the beam expander assembly 130 includes a first beam expander lens 131 and a second beam expander lens 132, which are sequentially arranged along the optical path. The first beam expander lens 131 is a negative meniscus lens, and the second beam expander lens 132 is a positive lens. The first beam expander lens 131 and the second beam expander lens 132 have different focal lengths. Thus, by using two lenses with different focal lengths, the divergence angle of the light beam in the first direction and the divergence angle of the light beam in the second direction are adjusted to be the same. As an example, when the focal length of the first beam expander lens 131 is 10 mm and the focal length of the second beam expander lens 132 is 20 mm, the beam expander assembly 130 produces a magnification of 2 times.

[0029] Furthermore, both the first beam expander lens 131 and the second beam expander lens 132 are cylindrical lenses, and the light-entering surface of the first beam expander lens 131 is a curved surface, and the light-emitting surface is a flat surface; the light-entering surface of the second beam expander lens 132 is a flat surface, and the light-emitting surface is a curved surface. Preferably, the curved surfaces of the first beam expander lens 131 and the second beam expander lens 132 are both spherical surfaces to reduce processing difficulty.

[0030] Please also participate Figure 2 In one embodiment, the galvanometer module 140 includes a first reflector 141 and a second reflector 142. The first reflector 141 is used to reflect the light beam to the second reflector 142, and the second reflector 142 is used to reflect the light beam to the field lens 150 to achieve a change in the direction of the light beam. Furthermore, the galvanometer module 140 also includes a first swing drive member and a second swing drive member. The first swing drive member is connected to the first reflector 141, and the second swing drive member is connected to the second reflector 142 to drive the first reflector 141 and the second reflector 142 to swing in two different directions, respectively, thereby ensuring that the first reflector 141 can accurately receive the collimated and expanded light beam, and ensuring that the second reflector 142 can receive the light beam reflected from the first reflector 141 and reflect the light beam to the field lens 150.

[0031] As an example, the galvanometer module 140 further includes a mounting base 143 , and the first swing driving component and the second swing driving component are both disposed on the mounting base 143 .

[0032] In summary, the optical system for 3D printing provided by this application has at least the following advantages:

[0033] 1. Using a light beam with a wavelength of 450nm reduces the volume of the light source 110 and improves processing efficiency;

[0034] 2. Using an aspheric biconvex lens as the collimating lens 120 improves the collimation effect and processing effect;

[0035] 3. Use two beam expansion lenses with different focal lengths to ensure that the divergence angles of the light beams in two directions are consistent after beam expansion, thereby ensuring that the subsequent focused light spots have the same size in two directions, improving the processing effect.

[0036] On the other hand, the present application also provides a 3D printing device, comprising the optical system for 3D printing in the above embodiment. It is also understood that the processing material of the 3D printing device is preferably a metal material.

[0037] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. An optical system for 3D printing, characterized in that: It includes a light source and a collimating lens, a beam expander lens group, a galvanometer module and a field lens arranged in sequence along the light path; The wavelength of the light beam generated by the light source is 450 nm, and the collimating lens is an aspherical biconvex lens.

2. The optical system for 3D printing according to claim 1, wherein: The light beam generated by the light source includes a light beam in a first direction and a light beam in a second direction, and a divergence angle of the light beam in the first direction is smaller than a divergence angle of the light beam in the second direction.

3. The optical system for 3D printing according to claim 2, wherein: The light beam in the first direction is a multimode light beam, and the light beam in the second direction is a fundamental mode Gaussian light beam.

4. The optical system for 3D printing according to claim 1, wherein: The galvanometer module includes a first reflector and a second reflector, wherein the first reflector is used to reflect the light beam to the second reflector, and the second reflector is used to reflect the light beam to the field mirror.

5. The optical system for 3D printing according to claim 4, characterized in that: The galvanometer module further includes a first swing driving member and a second swing driving member, wherein the first swing driving member is connected to the first reflector, and the second swing driving member is connected to the second reflector to drive the first reflector and the second reflector to swing in two different directions respectively.

6. The optical system for 3D printing according to claim 1, wherein: The beam expander lens group includes a first beam expander lens and a second beam expander lens arranged in sequence along the optical path direction. The first beam expander lens is a negative meniscus lens, the second beam expander lens is a positive lens, and the focal lengths of the first beam expander lens and the second beam expander lens are different.

7. The optical system for 3D printing according to claim 6, wherein: The first beam expanding lens and the second beam expanding lens are both cylindrical lenses, and the light input surface of the first beam expanding lens is a curved surface and the light output surface is a flat surface, while the light input surface of the second beam expanding lens is a flat surface and the light output surface is a curved surface.

8. A 3D printing device, characterized in that: An optical system for 3D printing comprising the optical system according to any one of claims 1 to 7.

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