3D printer and lens

Abstract

The 3D printer comprises a frame structure, a forming module and an imaging module, the forming module and the imaging module are arranged on the frame structure, the imaging module comprises a light machine and a Fresnel lens arranged on the light machine, and the Fresnel lens and the forming module are both located on a projection path of light source light generated by the light machine. The Fresnel lens comprises a lens body and an anti-deformation hardened layer formed on one side of the lens body. According to the technical scheme provided by the utility model, the surface of the Fresnel lens is hardened, so that the thermal stability and durability of the Fresnel lens are remarkably improved, the Fresnel lens can be effectively prevented from being deformed due to temperature change especially in an application scene of a high-power light source, and the service life of the Fresnel lens is prolonged. And the stability of the light collimation effect and the overall performance of the optical system are ensured. And in addition, the processing cost and the weight of the optical module can be reduced, and the light weight of the Fresnel lens can be realized while the structural strength and the stability of the Fresnel lens are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to 3D printer technical field, specifically, 3D printer and lens. BACKGROUND

[0002] When the optical scheme of the Fresnel lens collimation is adopted, the Fresnel lens will be deformed at about 70 DEG C, and there is a risk of deformation after long-time ultraviolet light irradiation and transportation, the collimation effect and light projection quality will decrease, and the printing precision of the 3D printer will be affected to some extent. SUMMARY

[0003] The utility model provides a kind of 3D printer and lens, to improve the structural strength and stability of Fresnel lens itself.

[0004] In order to achieve the above purpose, according to one aspect of the utility model, the utility model provides a kind of 3D printer, 3D printer includes frame structure and is set on the frame structure on forming module and imaging module, imaging module includes light machine and is set on the Fresnel lens 10 of light machine, and the Fresnel lens 10 and forming module are located on the projection path of light source light of light machine, and the Fresnel lens includes lens main body and the deformation hardening layer formed on one side of lens main body.

[0005] Further, the transmittance of the Fresnel lens is greater than 85%, and / or the difference between the refractive index of the lens main body and the refractive index of the deformation hardening layer is not more than 0.05.

[0006] Further, the thickness of the deformation hardening layer is 1-100 microns.

[0007] Further, the deformation hardening layer uniformly covers one side of the lens main body.

[0008] Further, the deformation hardening layer is sprayed and solidified on the lens main body; or, the deformation hardening layer is plated on the surface of the lens main body; or, the deformation hardening layer is modified and chemically treated on the surface of the lens main body.

[0009] Further, the deformation hardening layer is sprayed and solidified on the lens main body, and the spraying material at least includes at least one of inorganic matter, silicone paint, fluorocarbon paint, multifunctional acrylate, thermosetting resin and UV light-sensitive paint.

[0010] Further, the deformation hardening layer is at least formed by baking and ultraviolet light curing.

[0011] Further, the lens body has oppositely arranged light receiving surface and working surface, the light receiving surface is a plane and is arranged towards the light source of the light machine, the deformation-resistant hardening layer is formed on the light receiving surface, and the working surface comprises a center surface and a plurality of annular tooth surfaces arranged around the center surface.

[0012] Further, the imaging module further comprises a supporting base and a free-form lens, the light machine and the free-form lens are arranged on the supporting base, the free-form lens is located on the light emitting side of the light machine and covers the light source generated by the light machine, and the free-form lens has a plurality of light emitting surfaces which converge and / or disperse the light rays of the light source generated by the light machine.

[0013] According to another aspect of the present application, a lens is provided, which comprises a lens body, the lens body has a light receiving surface and a working surface, the light receiving surface is a plane, the working surface is a non-plane, and the light receiving surface of the lens body is formed with a deformation-resistant hardening layer.

[0014] The technical scheme of the present application provides a 3D printer, which comprises a frame structure and a forming module and an imaging module arranged on the frame structure, the imaging module comprises a light machine and a Fresnel lens 10 arranged on the light machine, the Fresnel lens 10 and the forming module are located on the projection path of the light rays of the light source generated by the light machine, and the Fresnel lens comprises a lens body and a deformation-resistant hardening layer formed on one side of the lens body.

[0015] The technical scheme of the present application provides a 3D printer, which comprises a frame structure and a forming module and an imaging module arranged on the frame structure, the imaging module comprises a light machine and a Fresnel lens 10 arranged on the light machine, the Fresnel lens 10 and the forming module are located on the projection path of the light rays of the light source generated by the light machine, and the Fresnel lens comprises a lens body and a deformation-resistant hardening layer formed on one side of the lens body. BRIEF DESCRIPTION OF DRAWINGS

[0016] The drawings accompanying the specification of the present application form a part of the present application and serve to provide a further understanding of the present application, the illustrative embodiments of the present application and the explanations thereof serve to explain the present application and do not constitute an improper limitation of the present application. In the drawings:

[0017] Figure 1 A structure schematic view of the Fresnel lens of the imaging module of the 3D printer provided by the embodiment of the present application is shown;

[0018] Figure 2 A preparation process diagram of the Fresnel lens of Figure 1 is shown;

[0019] Figure 3 A comparison diagram of the Fresnel lens of the present application and a Fresnel lens of prior art under the same temperature and time is shown. Figure 1 A comparison diagram of the Fresnel lens of the present application and a Fresnel lens of prior art under the same temperature and time is shown.

[0020] Figure 4 An application diagram of the imaging module of the present application is shown. Figure 1 An application diagram of the imaging module of the present application is shown.

[0021] Wherein, the above drawings include the following reference signs:

[0022] 10, Fresnel lens;

[0023] 11, lens body; 111, light receiving surface; 112, center surface; 113, annular tooth surface;

[0024] 12, deformation-resistant hardening layer;

[0025] 20, support base;

[0026] 30, free-form surface lens; 301, first light emitting surface; 302, second light emitting surface; 303, third light emitting surface; 304, fourth light emitting surface;

[0027] 40, imaging surface. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0029] As shown in Figures 1 to 3 The embodiments of the present application provide a 3D printer, which comprises a frame structure and a forming module and an imaging module arranged on the frame structure, the imaging module comprises a light machine and a Fresnel lens 10 arranged on the light machine, the Fresnel lens 10 and the forming module are located on the projection path of the light source light generated by the light machine, the Fresnel lens 10 is applied to the light machine of the 3D printer, and the Fresnel lens 10 comprises a lens body 11 and a deformation-resistant hardening layer 12 formed on one side of the lens body 11.

[0030] The hardening treatment is performed on the surface of the Fresnel lens 10 itself, which significantly improves the thermal stability and durability of the Fresnel lens 10. In particular, in the application scenario of a high-power light source, the deformation of the Fresnel lens 10 due to temperature changes can be effectively prevented, ensuring the stability of the light collimation effect and the overall performance of the optical system. Moreover, such a configuration is conducive to reducing the processing cost and weight of the optical module, and helps to achieve lightweight of the Fresnel lens 10 while improving the structural strength and stability of the Fresnel lens 10.

[0031] It should be noted that the imaging module also includes an imaging surface 40 (which can be a liquid crystal screen or the like) for imaging. Currently, when the Fresnel lens 10 is used as a collimation scheme, a support is often added below the Fresnel lens 10 to reduce the degree of deformation of the Fresnel lens 10. The light source first passes through the free-form surface homogenizer, and then is collimated by the Fresnel lens 10 to control the output of the required image by the imaging surface 40. However, due to the setting of the support, the weight and cost of the imaging module are increased, and the support will cause the optical power to attenuate. Compared with the prior art, which requires a support to assist and strengthen the Fresnel lens 10, the present embodiment does not require additional design of a support, which can effectively reduce the processing cost and weight of the optical module.

[0032] The transmittance of the Fresnel lens 10 is greater than 85%. In this way, the situation that the optical power of the Fresnel lens 10 with the anti-deformation hardening layer 12 is attenuated is avoided, and the reliability of the Fresnel lens 10 is ensured.

[0033] It should be noted that the high-transmittance limitation of the Fresnel lens 10 allows more light energy to pass through the material, which can significantly improve the energy conversion efficiency. Moreover, high transmittance reduces the reflection and absorption of light at the material interface, thereby reducing the loss of light energy and helping to reduce image blurring and distortion, and improving the quality (clarity and contrast) of imaging. On the other hand, high-transmittance materials generally have better chemical stability and anti-aging performance, which enables the optical element to maintain performance during long-term use and prolongs the service life.

[0034] In the present embodiment, the lens body 11 has an opposite light receiving surface 111 and a working surface. The light receiving surface 111 is a plane and is arranged towards the light source of the optical engine. The anti-deformation hardening layer 12 is formed on the light receiving surface 111. The working surface includes a central surface 112 and a plurality of annular tooth surfaces 113 arranged around the central surface 112. In the direction of the central surface 112 towards the outer periphery of the lens body 11, the distance from the farthest point of the plurality of annular tooth surfaces 113 to the light receiving surface 111 gradually decreases.

[0035] As Figure 1As shown, from this perspective, the surface of the Fresnel lens 10 is composed of a series of sawtooth grooves, each of which corresponds to form a ring-shaped tooth surface 113, and the central part is an elliptical arc and corresponds to form a central surface 112. Each groove is different in angle from the adjacent groove, but all converge light to a point to form the focal point of the Fresnel lens 10. Each groove can be regarded as an independent small lens, which adjusts the light to parallel light or converges light. This design can also eliminate part of the spherical aberration. The Fresnel lens 10 can easily collimate a light source by placing the light source (i.e. the light source of the light machine of the 3D printer) at a distance of one focal length from the Fresnel lens 10. The Fresnel lens 10 uses the principle that the direction of light propagation does not change in the medium to realize the focusing and collimation functions of the traditional lens with a lighter and thinner structure.

[0036] Specifically, the difference between the refractive index of the deformation-resistant hardening layer 12 and the refractive index of the lens body 11 is not more than 0.05, and preferably, the structure of the Fresnel lens is simulated according to the light path for collimation. In theory, the refractive index of the lens body 11 and the refractive index of the deformation-resistant hardening layer 12 are the same. In this way, the lens body 11 and the deformation-resistant hardening layer 12 have the same refractive ability for light of different wavelengths, which helps to reduce chromatic aberration, especially when they are used in combination, they can be designed to compensate for each other's chromatic aberration, reduce the generation of stray light, and the same refractive index lens can theoretically achieve reflection-free contact when in contact, thereby facilitating the improvement of the transmittance of the Fresnel lens 10, while facilitating the reduction of reflection and chromatic aberration, which can improve the imaging quality and make the image clearer and more accurate in color. On the other hand, the limitation of the refractive index makes the Fresnel lens 10 not need to consider the complex optical properties brought by different refractive indices, which is conducive to simplifying the optical design and reducing the manufacturing cost, and at the same time, it is easier to maintain the Fresnel lens 10.

[0037] It should be noted that the transmittance of the Fresnel lens 10 as a whole is similar or the same before and after the deformation-resistant hardening layer 12 is attached. Specifically, the transmittance of the Fresnel lens 10 as a whole after the film is attached is related to the thickness of the deformation-resistant hardening layer 12, but relatively speaking, the deformation-resistant hardening layer 12 is relatively thin and has less effect on the transmittance, so it is mainly to ensure that the transmittance of the Fresnel lens 10 as a whole is similar or the same before and after the film is attached.

[0038] It can be understood that the overall thickness of the Fresnel lens 10 remains consistent before and after the film is attached, that is, the thickness of the lens body 11 is reduced by the same thickness as the anti-deformation hardening layer 12, so as to ensure that the transmittance of the lens body 11 is similar or the same as the transmittance of the anti-deformation hardening layer 12 (if the refractive index of the lens body 11 and the refractive index of the anti-deformation hardening layer 12 differ greatly, the light will not be collimated, but since the film thickness of the anti-deformation hardening layer 12 is small, and there is a certain tolerance for collimation during printing, the refractive index of the lens body 11 and the refractive index of the anti-deformation hardening layer 12 are allowed to have a certain deviation range, that is, the difference between them is not more than 0.05), thereby ensuring the consistency of the refractive index of the Fresnel lens 10 before and after the film is attached, and avoiding the case that the refractive index of the Fresnel lens 10 before and after the film is attached differs greatly and needs to be redesigned or adjusted. Since the thickness of the lens body 11 is much greater than the thickness of the anti-deformation hardening layer 12 in the present embodiment, the anti-deformation hardening layer 12 has relatively small influence on the light path, so the anti-deformation hardening layer 12 can also be directly attached to the bottom of the lens body 11 to form.

[0039] It should be noted that the uniformity and granularity of the anti-deformation hardening layer 12 can also cause stray light to form, and the anti-deformation hardening layer 12 in the present embodiment needs to adaptively adjust its uniformity and granularity on the basis of ensuring that its refractive index is consistent with that of the lens body 11.

[0040] Preferably, the thickness of the anti-deformation hardening layer 12 is 1-100 microns. In this way, it is avoided that the thickness of the anti-deformation hardening layer 12 is too small to achieve the anti-deformation hardening effect, and at the same time, it is avoided that the thickness of the anti-deformation hardening layer 12 is too large to affect the transmittance of the Fresnel lens 10, thereby ensuring the transmittance of the Fresnel lens 10 while improving the structural strength and stability of the Fresnel lens 10 itself.

[0041] Specifically, the anti-deformation hardening layer 12 uniformly covers one side of the lens body 11. In this way, it is further reduced to generate stray light on the basis of ensuring the structural reinforcement effect on the lens body 11, thereby ensuring the reliability of the application of the Fresnel lens 10 and improving the imaging quality and effect.

[0042] The anti-deformation hardening layer 12 is sprayed and solidified on the lens body 11; or, the anti-deformation hardening layer 12 is plated on the surface of the lens body 11 to form; or, the anti-deformation hardening layer 12 is modified and chemically treated on the surface of the lens body 11 to form.

[0043] As shown in FIG. 1, Figure 2 In the present embodiment, the anti-deformation hardening layer 12 is sprayed and solidified on the lens body 11, which facilitates the processing of the anti-deformation hardening layer 12 and is conducive to improving the processing efficiency of the Fresnel lens 10 on the basis of ensuring the reinforcement effect on the lens body 11.

[0044] It can be understood that the lens body 11 can be made of acrylic material, and in other embodiments not shown in the figure, the anti-deformation hardening layer 12 can be formed by coating the light-incident surface 111 of the lens body 11 with a quartz material in a vacuum condition.

[0045] The spraying material in the embodiment at least includes at least one of inorganic matter, silicone paint, fluorocarbon paint, multifunctional acrylate, thermosetting resin, and UV light-sensitive paint.

[0046] It can be understood that the sprayable or paintable material is not limited to the above-mentioned materials, and other materials with certain hardness and thermal stability can also be used.

[0047] As shown in the figure, Figure 2 The spraying material in the embodiment is fluorocarbon paint, which is sprayed on the light-incident surface 111 of the lens body 11 and then subjected to baking and curing treatment, thereby forming the anti-deformation hardening layer 12.

[0048] It can be understood that the operator can select different curing treatment methods according to the selected spraying material, such as in other embodiments not shown in the figure, the spraying material is UV light-sensitive paint, at this time, the UV shower coating process is adopted, the light-sensitive substance is showered on the light-incident surface 111 of the lens body 11, and then it is cured by ultraviolet light irradiation, thereby forming the anti-deformation hardening layer 12.

[0049] As shown in the figure, Figure 4 The imaging module further includes a support base 20 and a free-form surface lens 30, the light machine and the free-form surface lens 30 are both arranged on the support base 20, the free-form surface lens 30 is located on the light-emitting side of the light machine and covers the light source generated by the light machine, the free-form surface lens 30 has a plurality of light-emitting surfaces, and the light-emitting surfaces converge and / or disperse the light rays of the light source generated by the light machine.

[0050] Among them, the plurality of light-emitting surfaces of the free-form surface lens 30 include a first light-emitting surface 301, a second light-emitting surface 302, a third light-emitting surface 303, and a fourth light-emitting surface 304, the first light-emitting surface 301, the second light-emitting surface 302, and the third light-emitting surface 303 are sequentially connected and located on the outer side of the free-form surface lens 30 away from the light source, the fourth light-emitting surface 304 is located on the inner side of the free-form surface lens 30 close to the light source, the first light-emitting surface 301, the second light-emitting surface 302, and the fourth light-emitting surface 304 are convex outward away from the light source, and the third light-emitting surface 303 is concave inward toward the light source, since the fourth light-emitting surface 304 is a convex surface, the space below the fourth light-emitting surface 304 is empty and can accommodate and cover the light source, such as in the embodiment shown in the figure, which is a semicircular surface with the curvature center coinciding with the light-emitting center of the light source, so that the luminous flux distribution of the irradiation surface can be optimized, and the overall light rays are more uniform. Specifically, the free-form surface lens 30 has a symmetry plane, and the first light-emitting surface 301, the second light-emitting surface 302, and the fourth light-emitting surface 304 are symmetrically arranged on the symmetry plane. Figure 4 ​Figure 4 As shown, the second light exit surface 302 and the fourth light exit surface 304 are divided into two symmetrical parts by the symmetry plane, the first light exit surface 301 and the third light exit surface 303 are symmetrically distributed on both sides of the symmetry plane, the light generated by the light source has a first divergence angle range and a second divergence angle range, the second divergence angle range is around the outer periphery of the first divergence angle range, the light from the fourth light exit surface 304, the light in the first divergence angle range will pass through the second light exit surface 302 and be diverged, and the light in the second divergence angle range will pass through the first light exit surface 301 and the third light exit surface 303 and be converged, thereby avoiding the difference in divergence angle of the light and the non-uniformity of the irradiation surface, and making the overall distribution of the light more uniform.

[0051] Preferably, the number and distribution of the light exit surfaces, the first divergence angle, the second divergence angle and the like in the embodiment can be adaptively adjusted according to actual conditions.

[0052] Another embodiment of the utility model provides a lens, it includes lens main body 11, lens main body 11 has light surface 111 and working surface, light surface 111 is plane, working surface is nonplane, the light surface 111 of lens main body 11 is shaped with deformation prevention hardening layer 12. This embodiment does hardening treatment to the surface of lens itself, significantly improves the thermal stability and durability of lens, especially in the application scene of high-power light source, can effectively prevent lens from deformation due to temperature change, ensures the stability of light collimation effect and the overall performance of optical system. And such setting is favorable for reducing the processing cost and weight of optical module, is favorable for realizing the lightweight of lens while improving the structural strength and stability of lens. Wherein, the lens in the embodiment is a Fresnel lens 10.

[0053] In conclusion, the utility model provides a kind of 3D printer, by hardening paint spraying treatment or dip coating process on Fresnel lens 10 to form deformation prevention hardening layer 12 on lens main body 11, so that the stability of Fresnel lens 10 is further improved, solve the problem that Fresnel lens 10 will be heat deformed at about 70 DEG C, there is deformation risk after long time ultraviolet irradiation and transportation process, collimation effect and light projection quality will be somewhat decreased, so that the printing accuracy of 3D printer is influenced to some extent. And the Fresnel lens 10 used in the embodiment can improve the structural strength and stability of Fresnel lens 10 while reducing design and production cost, is favorable for realizing the lightweight and mass production of Fresnel lens 10, further optimizes space, compared with not being handled (industry standard is 60 DEG C) then the thermal stability of Fresnel lens 10 is improved.

[0054] Figure 3 As shown in the B) of the Fresnel lens ( Figure 3 and the Fresnel lens ( Figure 3The structural alignment chart of A) at 70℃ for 48 hours in the above table shows that the Fresnel lens without treatment in the prior art will be deformed obviously under the condition, while the Fresnel lens 10 provided in the embodiment does not appear obvious deformation.

[0055] It is to be understood that the terms used herein are for the purpose of describing specific embodiments and are not intended to limit exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, devices, components and / or combinations thereof, but do not preclude the presence or addition of one or more other features, steps, operations, devices, components and / or combinations thereof.

[0056] The relative arrangement of parts and steps, numerical expressions, and numerical values set forth in the examples are not intended to limit the scope of the present application, unless otherwise specifically indicated. At the same time, it should be understood that the sizes of the various parts shown in the drawings are not drawn in accordance with the actual proportional relationship. The technology, methods and devices known to those skilled in the related art can not be discussed in detail, but under appropriate circumstances, the technology, methods and devices should be considered as part of the authorized description. In all examples shown and discussed herein, any specific value should be interpreted as merely exemplary, and not as a limitation. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0057] In the description of the present application, it should be understood that the orientation words such as "front, rear, upper, lower, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and in the absence of contrary statements, these orientation words do not indicate and imply that the indicated device or element must have a specific orientation or be constructed and operated in a specific orientation, therefore it cannot be understood as a limitation on the scope of protection of the present application; the orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.

[0058] For purposes of the description hereinafter, spatial relative terms, such as "above", "below", "upper", "lower", and the like, can be used to describe the relative position of one element or feature to another as illustrated in the figures. It will be understood that the spatial relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "up" other elements or features would then be oriented "below" or "down" the other elements or features. Thus, the exemplary term "above" can encompass both an orientation of above and below. The device can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly. Well, the spatial relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "up" other elements or features would then be oriented "below" or "down" the other elements or features. Thus, the exemplary term "above" can encompass both an orientation of above and below. The device can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0059] In addition, it needs to be explained that the use of "first", "second" and the like words to limit the parts, only for the convenience of the corresponding parts for the distinction, such as no other declaration, the above words have no special meaning, therefore can not be understood as the restriction of the scope of protection of the utility model.

[0060] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Those skilled in the art can make various modifications and changes to the present application. Any modification, equivalent replacement, improvement, 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 3D printer, characterized by, The 3D printer comprises a frame structure and a forming module and an imaging module arranged on the frame structure, the imaging module comprises a light machine and a Fresnel lens (10) arranged on the light machine, the Fresnel lens (10) and the forming module are located on the projection path of the light source light generated by the light machine, the Fresnel lens (10) comprises a lens body (11) and a deformation-resistant hardening layer (12) formed on one side of the lens body (11).

2. The 3D printer of claim 1, wherein, The transmittance of the Fresnel lens (10) is greater than 85%, and / or the difference between the refractive index of the lens body (11) and the refractive index of the deformation-resistant hardening layer (12) is not more than 0.

05.

3. The 3D printer of claim 1, wherein, The thickness of the deformation-resistant hardening layer (12) is 1-100 microns.

4. The 3D printer of claim 1, wherein, The deformation-resistant hardening layer (12) uniformly covers one side of the lens body (11).

5. The 3D printer of claim 1, wherein, The deformation-resistant hardening layer (12) is formed by spraying and curing on the lens body (11); or, the deformation-resistant hardening layer (12) is formed by plating on the surface of the lens body (11); or, the deformation-resistant hardening layer (12) is formed by material modification and chemical treatment on the surface of the lens body (11).

6. The 3D printer of claim 1, wherein, The deformation-resistant hardening layer (12) is formed by spraying and curing on the lens body (11), and the spraying material at least includes at least one of inorganic matter, silicone paint, fluorocarbon paint, multifunctional acrylate, thermosetting resin and UV light sensitive paint.

7. The 3D printer of claim 6, wherein, The deformation-resistant hardening layer (12) is formed by at least baking and ultraviolet light curing.

8. The 3D printer of claim 1, wherein, The lens body (11) has oppositely arranged light receiving surface (111) and working surface, the light receiving surface (111) is a plane and is arranged towards the light source of the light machine, the deformation-resistant hardening layer (12) is formed on the light receiving surface (111), the working surface comprises a center surface (112) and a plurality of annular tooth surfaces (113) arranged around the center surface (112), in the direction of the center surface (112) towards the outer periphery of the lens body (11), the distance from the farthest distance of the plurality of annular tooth surfaces (113) to the light receiving surface (111) gradually decreases.

9. The 3D printer of claim 1, wherein, The imaging module further comprises a support base (20) and a free-form surface lens (30), the light machine and the free-form surface lens (30) are arranged on the support base (20), the free-form surface lens (30) is located on the light emitting side of the light machine and covers the light source generated by the light machine, the free-form surface lens (30) has a plurality of light emitting surfaces, and the light emitting surfaces converge and / or disperse the light source light generated by the light machine.

10. A lens characterized by The lens comprises a lens body (11), the lens body (11) has a light receiving surface (111) and a working surface, the light receiving surface (111) is a plane, and the working surface is a non-plane, and the light receiving surface (111) of the lens body (11) is formed with a deformation-resistant hardening layer (12).

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