3D printing illumination apparatus and 3D printer

Abstract

The present disclosure relates to a 3D printing illumination apparatus and a 3D printer. The 3D printing illumination apparatus comprises: a light source assembly, which is configured to emit parallel light; a modulation assembly, which is located on the light-emitting side of the light source assembly, the modulation assembly being configured to receive an electric driving signal and, on the basis of the electric driving signal, modulate the parallel light emitted by the light source assembly; and a light homogenizing assembly, which is located on the side of the modulation assembly facing away from the light source assembly in the light transmission direction, the light homogenizing assembly being configured to scatter modulated light emitted by the modulation assembly. The embodiment of the present disclosure performs tiny and uniform diffusion at a pixel boundary of a grayscale image projected by the modulation assembly, so as to reduce or eliminate a gap between adjacent pixels in the grayscale image projected by the modulation assembly, such that the 3D printing illumination apparatus can finally project more uniform grayscale images, thereby further reducing surface detail differences between printed physical models and designed three-dimensional digital models, and improving the quality of 3D printing.

Description

3D printing lighting device and 3D printer

[0001] This application claims priority to a Chinese patent application filed with the Patent Office of China on February 19, 2024, with application number 202410185565.5 and invention name “3D printing illumination device and 3D printer”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] The present disclosure relates to the field of 3D printing technology, and in particular to a 3D printing lighting device and a 3D printer. Background Art

[0003] Three-dimensional (3D) printing technology is a type of rapid prototyping technology. It decomposes a three-dimensional digital model designed by a computer into several layers of planar slices, and then uses a 3D printer to stack powdered, liquid or filamentary plastics, metals, ceramics or sand and other adhesive materials layer by layer according to the slice patterns, and finally accumulates them into a complete object.

[0004] In the field of 3D printing technology, when using existing 3D printing lighting devices for 3D printing, surface details often differ between the printed physical model and the designed three-dimensional digital model, resulting in low 3D printing quality. Currently, there is no effective solution to this problem. Summary of the Invention

[0005] In order to solve the above technical problems or at least partially solve the above technical problems, the present disclosure provides a 3D printing lighting device and a 3D printer.

[0006] The present disclosure provides a 3D printing illumination device, comprising:

[0007] a light source assembly configured to emit parallel light;

[0008] A modulation component is located on the light-emitting side of the light source component, and is configured to receive an electrical drive signal and modulate the parallel light emitted by the light source component based on the electrical drive signal;

[0009] The light uniforming component is located on the side of the modulation component away from the light source component along the light transmission direction, and is configured to scatter the modulated light emitted by the modulation component.

[0010] In some embodiments, the light source assembly includes:

[0011] a light source configured to emit light;

[0012] A free-form surface lens is located on the light-emitting side of the light source and covers the light source, and the free-form surface lens is configured to converge and disperse the light emitted by the light source based on different light-emitting surfaces;

[0013] The Fresnel lens is located on the side of the free-form surface lens away from the light source along the direction of light transmission. The Fresnel lens is configured to collimate the light emitted by the free-form surface lens to obtain parallel light.

[0014] In some embodiments, the modulation component includes an LCD or DLP device.

[0015] In some embodiments, the light homogenizing component is in the form of a membrane, and the light homogenizing component in the form of a membrane includes a light homogenizing film, light homogenizing glass, or a PTFE film.

[0016] In some embodiments, the light-homogenizing film includes:

[0017] The substrate and the diffusion particles are located on a side of the substrate away from the modulation component along the light transmission direction.

[0018] In some embodiments, the diffusion particles are spherical, and the light-homogenizing film includes diffusion particles of at least two diameters.

[0019] In some embodiments, the substrate and the diffusion particles are integrally formed; or the substrate and the diffusion particles are separately formed and the diffusion particles are coated on the substrate.

[0020] In some embodiments, the material of the substrate and the diffusing particles includes PET.

[0021] In some embodiments, the light homogenizing component includes a diffraction grating or a microprism array.

[0022] The present disclosure also provides a 3D printer, comprising any one of the above-mentioned 3D printing lighting devices.

[0023] The technical solution provided by the embodiments of the present disclosure has the following advantages over the prior art:

[0024] The 3D printing illumination device provided by the embodiment of the present disclosure includes: a light source component configured to emit parallel light; a modulation component located on the light emitting side of the light source component, the modulation component configured to receive an electrical drive signal and modulate the parallel light emitted by the light source component based on the electrical drive signal; a light homogenization component located on the side of the modulation component away from the light source component along the light transmission direction, the light homogenization component configured to scatter the modulated light emitted by the modulation component. It can be seen that by adopting the above technical solution, the modulation component can modulate the parallel light emitted by the light source component to preliminarily project a grayscale image, and the light homogenization component can scatter the modulated light emitted by the modulation component to perform a slight uniform diffusion at the pixel boundary of the grayscale image projected by the modulation component, so that the boundary between each pixel point in the final projected grayscale image is uniform, and the change transition of the grayscale value is more continuous, so that the 3D printing illumination device finally projects a more uniform grayscale image, thereby reducing the surface detail difference between the printed physical model and the designed three-dimensional digital model, and improving the 3D printing quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0026] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0027] FIG1 is a schematic structural diagram of a 3D printing illumination device provided in an embodiment of the present disclosure.

[0028] FIG2 is a schematic structural diagram of a light-uniform film provided in an embodiment of the present disclosure.

[0029] FIG3 is a schematic structural diagram of another 3D printing illumination device provided by an embodiment of the present disclosure.

[0030] FIG4 is a schematic diagram of a grayscale image provided by an embodiment of the present disclosure.

[0031] Among them, 110, light source assembly; 111, light source; 112, free-form surface lens; 1121, first light-emitting surface; 1122, second light-emitting surface; 1123, third light-emitting surface; 1124, fourth light-emitting surface; 1125, first connecting surface; 1126, second connecting surface; 113, Fresnel lens; 114, supporting base; 120, modulation assembly; 130, uniform light assembly; 131, substrate; 132, diffusion particles; 210, printing platform; 310, blank film. DETAILED DESCRIPTION

[0032] In order to more clearly understand the above-mentioned objectives, features and advantages of the present disclosure, the scheme of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features therein can be combined with each other in the absence of conflict.

[0033] In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure, but the present disclosure may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present disclosure, rather than all of the embodiments.

[0034] First, a brief description is given of the related art and its existing defects, as well as the solutions of the embodiments of the present disclosure proposed to improve them.

[0035] As described in the background technology, when using existing 3D printing lighting devices for 3D printing, there are often detailed differences in the surfaces of the printed physical model and the designed three-dimensional digital model. Such detailed differences are reflected, for example, in the fact that the printed physical model does not appear transparent. Specifically, when using transparent resin for 3D printing, the surface of the printed physical model will have a frosted and matte effect, making the printed physical model appear opaque. In this case, the surface needs to be polished later to make the printed physical model more transparent. However, the polishing process consumes a lot of manpower.

[0036] Regarding the issue of "differences in surface details between the printed physical model and the designed three-dimensional digital model", the applicant has discovered through research that the main reason for this problem is that there are obvious gaps between adjacent pixels in the grayscale image projected by the existing 3D printing lighting device, and the edges of the grayscale image are not uniform enough. Therefore, it is necessary to perform uniform light processing on the grayscale image to improve the problem of obvious gaps between adjacent pixels and the problem of uneven edges of the grayscale image. In order to address the uneven edges of the grayscale image, the uniform light algorithm provided by the slicing software can be used to optimize the edges of the sliced ​​image configured for 3D printing, so that the edges of the grayscale image projected by the 3D printing lighting device based on the sliced ​​image can be evenly transitioned, thereby making the surface of the printed physical model smoother and reducing the generation of layer lines. However, there is currently no effective solution to the problem of obvious gaps between adjacent pixels.

[0037] In view of this, the embodiments of the present disclosure provide a 3D printing lighting device and a 3D printer, which can reduce or eliminate the gaps between adjacent pixels in a grayscale image, thereby reducing the difference in surface details between the printed physical model and the designed three-dimensional digital model, and improving the quality of 3D printing.

[0038] The following is an illustrative description of the 3D printing illumination device and the 3D printer provided by the embodiments of the present disclosure with reference to the accompanying drawings.

[0039] Figure 1 is a structural schematic diagram of a 3D printing illumination device provided by an embodiment of the present disclosure. Referring to Figure 1, the 3D printing illumination device includes: a light source component 110, configured to emit parallel light; a modulation component 120, located on the light emitting side of the light source component 110, the modulation component 120 is configured to receive an electrical drive signal and modulate the parallel light emitted by the light source component 110 based on the electrical drive signal; a light homogenization component 130, located on the side of the modulation component 120 away from the light source component 110 along the light transmission direction, the light homogenization component 130 is configured to scatter the modulated light emitted by the modulation component 120.

[0040] Specifically, the specific structure of the light source assembly 110 can be configured by those skilled in the art according to actual conditions and is not limited here. The following is an illustration of a typical example, which does not constitute a limitation of the present disclosure.

[0041] It should be noted that the parallel light here refers to a light beam with an angle less than or equal to a preset angle. The preset angle can be 5°, etc., but is not limited thereto.

[0042] In some embodiments, continuing to refer to Figure 1, the light source assembly 110 may include a light source 111, which is configured to emit light; a free-form surface lens 112, located on the light-emitting side of the light source 111 and covering the light source 111, the free-form surface lens 112 is configured to converge and disperse the light emitted by the light source 111 based on different light-emitting surfaces; a Fresnel lens, along the light transmission direction, the Fresnel lens is located on the side of the free-form surface lens 112 away from the light source 111, the Fresnel lens is configured to collimate the light emitted by the free-form surface lens 112 to obtain parallel light.

[0043] Specifically, any light source 111 known to those skilled in the art can be used. Exemplarily, the light source 111 can be a chip-on-board (COB) light source 111, which can reduce costs and increase integration. The light source 111 can have a wavelength in the range of 380 nm to 450 nm. For example, an ultraviolet light-emitting diode (UV-LED) can be selected as the light source 111, and the central wavelength of the light emitted by the UV-LED is 405 nm, but the present invention is not limited thereto.

[0044] Specifically, taking the orientation and structure shown in FIG1 as an example, the free-form surface lens 112 is located above the light source 111 and covers the entire light source 111. This ensures that all light emitted by the light source 111 is received by the free-form surface lens 112, thereby homogenizing the entire light. Any free-form surface lens 112 and light source 111 known to those skilled in the art can be used.

[0045] For example, referring to FIG1 , the free-form surface lens 112 includes a first light-emitting surface 1122, a second light-emitting surface 1123, a third light-emitting surface 1123, a fourth light-emitting surface 1124, a first connecting surface 1125, and a second connecting surface 1126; the second light-emitting surface 1123 connects the first light-emitting surface 1122 and the third light-emitting surface 1123; the first connecting surface 1125 connects the first light-emitting surface 1122 and the fourth light-emitting surface 1124; the second connecting surface 1126 connects the third light-emitting surface 1123 and the fourth light-emitting surface 1126. 124; the first light emitting surface 1122, the second light emitting surface 1123 and the third light emitting surface 1123 are away from the light source 111; the fourth light emitting surface 1124 is toward the light source 111; the fourth light emitting surface 1124 is configured to allow the light emitted by the light source 111 to pass through; the second light emitting surface 1123 is configured to disperse the light within a first divergence angle range; the first light emitting surface 1122 and the third light emitting surface 1123 are configured to converge the light within a second divergence angle range; wherein the first divergence angle range is smaller than the second divergence angle range.

[0046] The first light-emitting surface 1122, the third light-emitting surface 1123, and the fourth light-emitting surface 1124 are convex surfaces; the second light-emitting surface 1123 is concave; the first light-emitting surface 1122 and the third light-emitting surface 1123 are symmetrically arranged with the fourth light-emitting surface 1124 as a reference plane; the first connecting surface 1125 and the second connecting surface 1126 are planes. Because the fourth light-emitting surface 1124 is convex, the area below the fourth light-emitting surface 1124 is hollow, which can accommodate and enclose the light source 111. For example, the fourth light-emitting surface 1124 is semicircular, with its center of curvature coinciding with the light emission center of the light source 111. This optimizes the luminous flux distribution on the irradiated surface, making the overall light more uniform.

[0047] There are differences in the divergence angles of light rays emitted in different directions from the fourth light-emitting surface 1124. To avoid uneven irradiation, the second light-emitting surface 1123 disperses the light rays within a first divergence angle range, while the first light-emitting surface 1122 and the third light-emitting surface 1123 converge the light rays within a second divergence angle range. This makes the overall distribution of light rays more uniform.

[0048] The first divergence angle range may be 0° to 30°, and the second divergence angle range may be 30° to 90°, but are not limited thereto.

[0049] It can be understood that when the light source 111, such as an ultraviolet light-emitting diode, emits light, the central light intensity of the ultraviolet light-emitting diode is the largest. As the divergence angle increases, the light intensity will gradually weaken, thereby resulting in an uneven irradiation surface. When a free-form surface lens 112 is arranged above the ultraviolet light-emitting diode, the light emitted by the ultraviolet light-emitting diode is converged and dispersed through the different light-emitting surfaces (or surfaces) of the free-form surface lens 112, thereby ensuring that the light emitted by the free-form surface lens 112 is more uniform, which is beneficial to improving the quality of 3D printing.

[0050] Specifically, the distance between the Fresnel lens 113 and the light source 111 can be determined based on the actual collimation distance of the Fresnel lens 113, which is determined by the focal length of the Fresnel lens 113 and the focal length of the free-form surface lens 112. In this way, the uniform light emitted by the free-form surface lens 112 can be highly collimated, outputting light with a high degree of parallelism.

[0051] Continuing to refer to FIG. 1 , optionally, the light source assembly 110 further includes a support base 114 , which is configured to support and fix the free-form surface lens 112 and the light source 111 .

[0052] Specifically, taking the orientation and structure shown in FIG1 as an example, the light source 111 is disposed on the upper surface of the support base 114, and the free-form lens 112 is covered above the light source 111 and disposed on the upper surface of the support base 114. The support base 114 can be a cubic structure, a cylindrical structure, etc., but is not limited thereto.

[0053] Of course, in other embodiments, the light source assembly 110 may further include a UV matrix light source 111 .

[0054] Specifically, the modulation component 120 can project the parallel light emitted by the light source component based on the electrical driving signal, thereby preliminarily projecting a grayscale image.

[0055] Specifically, the specific structure of the modulation component 120 can be configured by those skilled in the art according to actual conditions and is not limited here. The following is an illustration of a typical example, which does not constitute a limitation of the present disclosure.

[0056] In some embodiments, modulation component 120 may include an LCD.

[0057] Specifically, the LCD's light projection area includes a liquid crystal solution located between two sheets of polarized material. Because an electrical drive signal (corresponding to a sliced ​​image) can control the arrangement of the crystals to allow or block light from passing through them, each crystal acts like a Venetian blind, allowing or blocking light under the control of the corresponding electrical drive signal. In this way, the LCD's light projection area can modulate the parallel light emitted by light source assembly 110 based on the electrical drive signal. In other words, it allows some parallel light to pass through while blocking other parallel light (i.e., selective light transmission), thereby projecting a grayscale image corresponding to the electrical drive signal. This allows the resin to subsequently undergo a photocuring reaction, thereby printing a print layer corresponding to the pattern in the grayscale image.

[0058] In other embodiments, the modulation component 120 may include a digital light processing (DLP) device.

[0059] Exemplarily, the DLP device may include an optical DLP, but is not limited thereto.

[0060] Specifically, the distance between the modulation component 120 and the light source 111 can be set by those skilled in the art according to actual conditions and is not limited here.

[0061] Specifically, the light uniforming component 130 covers at least a portion of the light projection area of ​​the modulation component 120. Preferably, the light uniforming component 130 covers the entire light projection area of ​​the modulation component 120.

[0062] Specifically, the distance between the light homogenizing component 130 and the modulation component 120 can be set by those skilled in the art according to actual conditions and is not limited here.

[0063] It is understandable that, as mentioned above, there are obvious gaps between adjacent pixels in the grayscale image projected by the existing 3D printing lighting device. In the embodiment of the present disclosure, by setting the light homogenization component 130, the modulated light transmitted from the modulation component 120 can be scattered, so that each grayscale pixel in the grayscale image is slightly evenly diffused, thereby reducing or eliminating the gaps between adjacent pixels in the grayscale image, making the boundaries between each pixel point in the final projected grayscale image uniform, and the transition of grayscale value changes more continuous, thereby reducing the difference in surface details between the printed physical model and the designed three-dimensional digital model, and improving the quality of 3D printing. For example, when printing with a transparent resin, the 3D printing lighting device provided by the embodiment of the present disclosure can reduce or eliminate the grayscale texture on the surface of the printed physical model, thereby improving the transparency of the printed physical model.

[0064] Specifically, those skilled in the art can configure the specific structure of the light homogenizing component 130 according to actual conditions, and the present disclosure does not limit this. The following is an explanation based on typical examples, but does not constitute a limitation of the present application.

[0065] In some embodiments, the light homogenizing component is in the form of a membrane, and the light homogenizing component in the form of a membrane may include a light homogenizing film, light homogenizing glass, or a PTFE film.

[0066] FIG2 is a schematic diagram of the structure of a light-homogenizing film provided by an embodiment of the present disclosure. As shown in FIG2 , the light-homogenizing film includes a substrate 131 and diffusion particles 132 . Along the light transmission direction, the diffusion particles 132 are located on the side of the substrate 131 away from the modulation component 120 .

[0067] Specifically, the substrate 131 is configured to carry diffusion particles 132, and the diffusion particles 132 are configured to scatter the modulated light emitted from the modulation component 120 and passing through the substrate 131, so that each grayscale pixel in the grayscale image is slightly uniformly diffused, thereby reducing or eliminating the gap between adjacent pixels in the grayscale image.

[0068] Specifically, the specific shape of the substrate 131 can be determined by those skilled in the art based on actual circumstances and is not limited herein. For example, the orthographic projection of the substrate 131 on the modulation component 120 has the same shape as the light projection area of ​​the modulation component 120. For example, if the light projection area of ​​the modulation component 120 is rectangular, the substrate 131 can be in the shape of a rectangular film, and the rectangular area of ​​the substrate 131 can be greater than or equal to the rectangular area of ​​the light projection area of ​​the modulation component 120, but the present invention is not limited thereto.

[0069] Specifically, the specific shape of the diffusion particles 132 can be determined by those skilled in the art based on practical circumstances and is not limited herein. Optionally, the diffusion particles 132 are spherical. This simplifies the preparation process for the diffusion particles 132 and helps reduce the production cost of the diffusion particles 132. Furthermore, the light-homogenizing film optionally includes diffusion particles 132 of at least two different diameters. This allows the diffusion particles 132 to more fully scatter the modulated light, resulting in a more uniform diffusion effect at the boundaries between pixels in the grayscale image, thereby effectively reducing or eliminating the gaps between adjacent pixels in the grayscale image.

[0070] Specifically, the substrate 131 and the diffusion particles 132 can be integrally formed, which can reduce the preparation process of the light-uniform film and help reduce the preparation cost. In addition, the connection between the substrate 131 and the scattering particles is more reliable, which helps reduce the risk of the diffusion particles 132 peeling off from the substrate 131 and improve the life of the light-uniform film.

[0071] Of course, the substrate 131 and the diffusion particles 132 can also be formed separately and the diffusion particles 132 can be coated on the substrate 131. In this way, the difficulty of preparing the light-homogenizing film can be reduced, which is conducive to reducing the preparation cost, and the number and position of the diffusion particles 132 on the substrate 131 can be flexibly set.

[0072] Specifically, the materials of substrate 131 and scattering particles can be selected by those skilled in the art based on practical circumstances and are not limited herein. Optionally, the materials of substrate 131 and diffusion particles 132 include PET. Because PET has excellent transparency and light transmittance, with a light transmittance exceeding 90%, a light-homogenizing film made of PET can better scatter and transmit the modulated light emitted by modulation component 120, thereby reducing light energy loss.

[0073] Of course, in other examples, the diffusion particles 132 may also be located inside the substrate 131 . In this way, the substrate 131 may also protect the diffusion particles 132 , thereby preventing the diffusion particles 132 from being worn and thus affecting the diffusion effect.

[0074] Of course, in some other examples, some of the diffusion particles 132 are located inside the substrate 131 , and some of the diffusion particles 132 are located on a side of the substrate 131 away from the modulation component 120 along the light transmission direction.

[0075] Exemplarily, during 3D printing, the operating principle of the 3D printing illumination device shown in FIG. 1 is as follows: When the light output by light source 111 is transmitted to free-form surface lens 112, free-form surface lens 112 can converge and disperse the light output by light source 111 to make the overall light more uniform. When the light transmitted from free-form surface lens 112 is transmitted to Fresnel lens 113, Fresnel lens 113 can collimate free-form surface lens 112 to output parallel light. When the parallel light is transmitted to modulation component 120, modulation component 120 can modulate the parallel light based on the received electrical drive signal so that modulation component 120 projects a grayscale image. When the light transmitted from modulation component 120 is transmitted to the uniform light film, it is scattered by diffusion particles 132, which makes the boundaries between the pixels of the grayscale image uniform and the transition of grayscale value changes more continuous, thereby making the grayscale image ultimately projected onto printing platform 210 more uniform.

[0076] To demonstrate the effect of a light-diffusing film on reducing the gaps between adjacent pixels in a grayscale image, FIG3 is a schematic diagram of the structure of another 3D printing illumination device provided by an embodiment of the present disclosure. FIG4 is a schematic diagram of a grayscale image provided by an embodiment of the present disclosure. As shown in FIG3 and FIG4, a light-diffusing film is installed on half of the light projection area of ​​the modulation component 120, and a blank film 310 is installed on the other half as a control. Light emitted from the modulation component 120 is projected onto the printing platform 210 through the blank film 310 to obtain an original grayscale image. Light emitted from the modulation component 120 is projected onto the printing platform 210 through the light-diffusing film to obtain a homogenized grayscale image. As can be seen from the two grayscale image results shown in FIG4, the transition between adjacent pixel gaps JX1 in the original grayscale image is very uneven and has obvious texture. However, the transition between adjacent pixel gaps JX2 in the grayscale image homogenized by the light-diffusing film is significantly optimized. Therefore, the use of a light-diffusing film can make the surface transition of the printed physical model smoother and reduce the occurrence of layered lines, thereby improving transparency.

[0077] Specifically, any light homogenizing glass known to those skilled in the art may be used, as long as it can achieve a more uniform diffusion effect at the boundaries between pixels in the grayscale image.

[0078] Specifically, PTFE membrane is a microporous film produced by using polytetrafluoroethylene dispersed resin through special processes such as premixing, extrusion, calendering, and biaxial stretching.

[0079] It can be understood that when the light emitted from the modulation component 120 is transmitted to the PTFE membrane, due to the microporous structure on the PTFE membrane, scattering will occur under the action of the microporous structure, making the boundaries between the pixel points of the grayscale image uniform, and the change of the grayscale value transition more continuous, so that the grayscale image finally projected onto the printing platform 210 is more uniform.

[0080] Of course, in other embodiments, the light homogenizing component 130 may also include a diffraction grating.

[0081] Specifically, any diffraction grating known to those skilled in the art may be used, as long as it can achieve a more uniform diffusion effect at the boundaries between pixels in the grayscale image.

[0082] Of course, in some other embodiments, the light homogenizing component 130 may further include a microprism array.

[0083] Specifically, any microprism array known to those skilled in the art may be used, as long as it can achieve a more uniform diffusion effect at the boundaries between pixels in the grayscale image.

[0084] On the basis of the above embodiments, the embodiments of the present disclosure further provide a 3D printer, comprising any one of the 3D printing illumination devices provided in the above embodiments, which has corresponding beneficial effects.

[0085] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device that includes the element.

[0086] The foregoing description is intended only to provide specific embodiments of the present disclosure, intended to enable those skilled in the art to understand and implement the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure is not intended to be limited to the embodiments described herein, but rather to be construed in the broadest manner consistent with the principles and novel features disclosed herein. Industrial Applicability

[0087] In the 3D printing illumination device provided by the present disclosure, the modulation component can modulate the parallel light emitted by the light source component to preliminarily project a grayscale image, and the uniform light component can scatter the modulated light emitted by the modulation component to perform a slight uniform diffusion at the pixel boundary of the grayscale image projected by the modulation component, so that the boundaries between each pixel point in the final projected grayscale image are uniformed, and the transition of the grayscale value change is more continuous, so that the 3D printing illumination device ultimately projects a more uniform grayscale image. In this way, the difference in surface details between the printed physical model and the designed three-dimensional digital model can be reduced, the quality of 3D printing can be improved, and the device has strong industrial practicality.

Claims

1. A 3D printing illumination device, wherein: include: a light source assembly configured to emit parallel light; a modulation component, located at the light-emitting side of the light source component, the modulation component being configured to receive an electrical drive signal and modulate the parallel light emitted by the light source component based on the electrical drive signal; A light uniforming component is located on a side of the modulation component away from the light source component along the light transmission direction, and is configured to scatter the modulated light emitted by the modulation component.

2. The 3D printing illumination device according to claim 1, wherein: The light source assembly comprises: a light source configured to emit light; a free-form surface lens, located on a light-emitting side of the light source and covering the light source, wherein the free-form surface lens is configured to converge and disperse light emitted by the light source based on different light-emitting surfaces; A Fresnel lens is located on a side of the free-form surface lens away from the light source along the light transmission direction, and is configured to collimate the light emitted by the free-form surface lens to obtain parallel light.

3. The 3D printing illumination device according to claim 1, wherein: The modulation component includes an LCD or DLP device.

4. The 3D printing illumination device according to claim 1, wherein: The light homogenizing component is in the shape of a membrane, and the light homogenizing component in the shape of a membrane includes a light homogenizing film, light homogenizing glass, or a PTFE film.

5. The 3D printing illumination device according to claim 4, wherein: The light uniforming film includes: The substrate and the diffusion particles are located on a side of the substrate away from the modulation component along the light transmission direction.

6. The 3D printing illumination device according to claim 5, wherein: The diffusion particles are spherical, and the light-homogenizing film includes diffusion particles of at least two diameters.

7. The 3D printing illumination device according to claim 5, wherein: The substrate and the diffusion particles are integrally formed; or the substrate and the diffusion particles are separately formed and the diffusion particles are coated on the substrate.

8. The 3D printing illumination device according to claim 5, wherein: The material of the substrate and the diffusion particles includes PET.

9. The 3D printing illumination device according to claim 1, wherein: The light homogenizing component includes a diffraction grating or a microprism array.

10. A 3D printer, wherein: A 3D printing lighting device comprising the 3D printing lighting device according to any one of claims 1 to 9.

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