Photocuring three-dimensional printing device

Abstract

The utility model discloses a photocuring three-dimensional printing device, relates to the technical field of three-dimensional printing, and mainly aims to improve the printing precision of the photocuring three-dimensional printing device. According to the main technical scheme, the photocuring three-dimensional printing device comprises a micro light-emitting diode array, a first lens array and a trough, the first lens array and the trough are arranged on an emergent light path of the micro light-emitting diode array, the first lens array is located between the micro light-emitting diode array and the trough, and the first lens array is used for converging light rays emitted by the micro light-emitting diode array in the trough in an imaging mode.

Description

Technical Field

[0001] The utility model relates to the technical field of three-dimensional printing, and more specifically, to a stereolithography three-dimensional printing device. Background Art

[0002] The light source adopted by a stereolithography three-dimensional printer is usually in a backlight form, that is, the entire exposure screen is illuminated under the exposure screen, and then the exposure area to be exposed is controlled through the exposure screen to complete printing.

[0003] Due to the characteristics of the exposure screen itself, its contrast is limited, resulting in poor display effect of the exposure screen, thereby affecting the printing accuracy. Summary of the Utility Model

[0004] In view of this, an embodiment of the utility model provides a stereolithography three-dimensional printing device, and the main purpose is to improve the printing accuracy of the stereolithography three-dimensional printing device.

[0005] To achieve the above purpose, the utility model mainly provides the following technical solutions:

[0006] An embodiment of the utility model provides a stereolithography three-dimensional printing device, including:

[0007] A micro light-emitting diode array, a first lens array and a material tank;

[0008] The first lens array and the material tank are arranged on the outgoing light path of the micro light-emitting diode array, the first lens array is located between the micro light-emitting diode array and the material tank, and the first lens array is used to image and converge the light emitted by the micro light-emitting diode array in the material tank.

[0009] Optionally, the stereolithography three-dimensional printing device further includes:

[0010] A second lens array, the second lens array is arranged on the outgoing light path of the micro light-emitting diode array and is located between the micro light-emitting diode array and the first lens array, and the second lens array is used to reduce the light-emitting angle of the micro light-emitting diode array.

[0011] Optionally, the second lens array is used to reduce the light-emitting angle of the micro light-emitting diode array to 1 to 30 degrees.

[0012] Optionally, the second lens array is a microlens array, the microlens array includes a plurality of microlenses, the microlenses are plano-convex lenses or biconvex lenses, and the convex surfaces of the microlenses are free-form surfaces or arc surfaces;

[0013] If the microlens is a plano-convex lens, the convex surface of the microlens faces the first lens array, and the flat surface of the microlens faces the micro light-emitting diode array;

[0014] If the microlens is a biconvex lens, one convex surface of the microlens faces the first lens array, and the other convex surface of the microlens faces the micro light-emitting diode array.

[0015] Optionally, the distance between the microlens and the light-emitting surface of the micro light-emitting diode array is 0-2 mm.

[0016] Optionally, the micro light-emitting diode array includes a plurality of micro light-emitting diode groups, and each micro light-emitting diode group includes at least one micro light-emitting diode;

[0017] The light-curing three-dimensional printing device further includes a plurality of light-blocking members, and the light-blocking members are arranged between adjacent two micro light-emitting diode groups.

[0018] Optionally, the light-blocking member includes a first end and a second end facing away from each other, the first end extends to the first lens array, and the distance between the first end and the first lens array is 0-2 mm, and the second end extends to the bottom end of the micro light-emitting diode group.

[0019] Optionally, the micro light-emitting diode array includes a plurality of micro light-emitting diode groups, and each micro light-emitting diode group includes at least one micro light-emitting diode;

[0020] The first lens array includes a plurality of lens groups, and the plurality of lens groups correspond to the plurality of micro light-emitting diode groups one by one.

[0021] Optionally, each micro light-emitting diode group includes four micro light-emitting diodes, and the four micro light-emitting diodes correspond to one lens group.

[0022] Optionally, the lens group includes a first end face facing the material tank and a second end face facing the micro light-emitting diode array;

[0023] Both the first end face and the second end face are free-form surfaces, flat surfaces or outwardly convex arc surfaces.

[0024] Optionally, the distance between the lens group and the micro light-emitting diode array in the optical axis direction is L1;

[0025] The distance between the lens group and the material tank in the optical axis direction is L2;

[0026] Wherein, L1≥L2.

[0027] Optionally, 0 ≤ L1 ≤ 4 mm; 0 ≤ L2 ≤ 3 mm.

[0028] Optionally, the radius of curvature of the first end face of the lens group is R1;

[0029] the radius of curvature of the second end face of the lens group is R2;

[0030] wherein, L1 ≤ |R1| + |R2|; L2 ≤ |R1| + |R2|.

[0031] Optionally, the focal length of the lens group is 0 - 10 mm.

[0032] Optionally, the diameter of the lens group is D; the height of the lens group is H;

[0033] wherein, H:D ≥ 3:1.

[0034] Optionally, the first lens array includes a plurality of lens groups, the lens groups are in a fisheye structure, the lens groups include a plurality of lenses stacked along the optical axis direction, and the shape of the lens close to the material tank is a convex arc.

[0035] Optionally, the micro light emitting diode array includes a plurality of micro light emitting diodes or a plurality of sub - millimeter light emitting diodes.

[0036] Optionally, if the micro light emitting diode array includes a plurality of the micro light emitting diodes, the diameter of the micro light emitting diode is 10 to 100 μm, and the light emitting angle of the micro light emitting diode is any value between 60° and 120°.

[0037] By means of the above - mentioned technical solution, the present utility model has at least the following beneficial effects:

[0038] In the light - curing three - dimensional printing device provided by the embodiment of the present utility model, each pixel point of the micro light emitting diode array can be used as a display pixel point, and this is used as the basic unit for imaging to display an image, thereby achieving a high - resolution display effect. Moreover, through the first lens array, the light rays with a certain divergence angle of each pixel point of the micro light emitting diode array are converged and restored, that is, converged and imaged in the material tank to cure the light - curable material, which can improve the printing accuracy of the model, enhance the printing quality of the model, and ensure the accuracy of model curing. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 is a schematic structural diagram of a light - curing three - dimensional printing device provided by an embodiment of the present utility model;

[0040] Figure 2 is a schematic structural diagram of another light - curing three - dimensional printing device provided by an embodiment of the present utility model;

[0041] Figure 3 A schematic structural diagram of another light-curing three-dimensional printing device provided by an embodiment of the present invention;

[0042] Figure 4 A schematic structural diagram of a material tank, a lens group, and a micro light-emitting diode group in a light-curing three-dimensional printing device provided by an embodiment of the present invention.

[0043] Description of reference numerals:

[0044] 1 - Micro light-emitting diode array; 11 - Micro light-emitting diode group; 2 - First lens array; 21 - Lens group; 3 - Material tank; 4 - Second lens array; 41 - Microlens; 5 - Light-blocking member. Detailed implementation manners

[0045] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to the accompanying drawings in the preferred embodiments of the present invention.

[0046] As Figures 1 to 3 shown, an embodiment of the present invention provides a light-curing three-dimensional printing device, including a micro light-emitting diode array 1, a first lens array 2, and a material tank 3; the first lens array 2 and the material tank 3 are disposed on the light-emitting path of the micro light-emitting diode array 1, the first lens array 2 is located between the micro light-emitting diode array 1 and the material tank 3, and the first lens array 2 is configured to image the image displayed by the micro light-emitting diode array 1 in the material tank 3.

[0047] Among them, the micro light-emitting diode array 1 may include a plurality of micro light-emitting diodes (Micro LED) or a plurality of submillimeter light-emitting diodes (Mini LED).

[0048] Among them, the first lens array 2 may be an imaging lens array, the imaging lens array may include a plurality of lens groups 21, that is, imaging lens groups, the imaging lens groups may be multi-piece type, and are configured to restore each pixel point in the micro light-emitting diode array 1 to the pixel-level size to image the image displayed by the micro light-emitting diode array 1. In addition, in some embodiments, in order to reduce the imaging distortion of the imaging lens group, the imaging lens group 21 may be set to a fisheye structure. Specifically, the first lens of the imaging lens group 21, that is, the lens close to the material tank 3, is set to a convex arc shape, so that the imaging lens group 21 can receive more light, thereby improving the imaging efficiency of the first lens array 2.

[0049] In the light-curing three-dimensional printing device provided by the embodiment of the present utility model, each pixel of the micro light-emitting diode array 1 can be used as a display pixel, and this is used as the basic unit for imaging to display an image, thereby achieving a high-resolution display effect. Moreover, the light with a certain divergence angle of each pixel of the micro light-emitting diode array 1 is converged and restored by the first lens array 2, that is, converged and imaged in the material tank 3 to cure the light-curing material, which can improve the printing accuracy of the model, enhance the printing quality of the model, and ensure the accuracy of model curing.

[0050] Specifically, the size of each pixel in the micro light-emitting diode array 1 can reach the micron level, and moreover, each pixel can be addressed and controlled independently to control brightness and darkness.

[0051] In some embodiments, referring to Figure 3 , the light-curing three-dimensional printing device may further include a second lens array 4. The second lens array 4 is disposed on the outgoing light path of the micro light-emitting diode array 1 and is located between the micro light-emitting diode array 1 and the first lens array 2. The second lens array 4 is used to reduce the light-emitting angle of the micro light-emitting diode array 1.

[0052] In the above embodiment, by disposing the second lens array 4 between the micro light-emitting diode array 1 and the first lens array 2, the second lens array 4 can reduce the angle of the light emitted by the micro light-emitting diode array 1, thereby reducing the light-emitting angle of the micro light-emitting diode array 1, further improving the imaging efficiency, and preventing the light emitted by two adjacent micro light-emitting diodes in the micro light-emitting diode array 1 from interfering with each other to further improve the printing effect.

[0053] In some embodiments, the second lens array 4 may be a microlens array. The microlens array includes a plurality of microlenses 41. The microlens 41 may be a plano-convex lens or a biconvex lens. The convex surface of the microlens 41 may be a free-form surface or an arc surface; if the microlens 41 is a plano-convex lens, the convex surface of the microlens 41 faces the first lens array 2, and the plane of the microlens 41 faces the micro light-emitting diode array 1; if the microlens 41 is a biconvex lens, one convex surface of the microlens 41 faces the first lens array 2, and the other convex surface of the microlens 41 faces the micro light-emitting diode array 1.

[0054] Among them, the size of the microlens 41 is very small, adapted to the micro light-emitting diode, and is used to converge light to reduce the light-emitting angle of the micro light-emitting diode. The light-emitting angle of the micro light-emitting diode after being collected by the microlens 41 can be 1 to 30 degrees.

[0055] Among them, the convex surface of the microlens 41 can be a free-form surface or an arc surface. The free-form surface (i.e., aspherical surface) has a higher degree of freedom and involves the existence of high-order images, which is more beneficial for correcting field curvature. The arc surface is a standard arc surface and is easier to process and manufacture.

[0056] In some embodiments, the distance between the microlens 41 and the light-emitting surface of the micro-LED array 1 can be 0 - 2 mm, so that the microlens 41 is as close as possible to the micro-LED array 1, thereby avoiding light leakage, enabling almost all light to pass through the microlens 41, further improving the imaging efficiency, better preventing light crosstalk between two adjacent micro-LEDs in the micro-LED array 1, and further enhancing the printing effect.

[0057] In some embodiments, referring to Figure 2 and Figure 3 , the micro-LED array 1 includes a plurality of micro-LED groups 11, and the micro-LED group 11 can include at least one micro-LED; the stereolithography three-dimensional printing device further includes a plurality of light-blocking members 5, and a light-blocking member 5 is disposed between two adjacent micro-LED groups 11.

[0058] Among them, the light-blocking member 5 can be a light-blocking plate, which is disposed between two adjacent micro-LED groups 11, can reduce the light crosstalk between adjacent micro-LED groups 11, and can also absorb large-angle light, thereby eliminating some stray light, and further enhancing the printing effect.

[0059] In some embodiments, the light-blocking member 5 can include a first end and a second end facing away from each other. The first end can extend to the first lens array 2, and the distance between the first end and the first lens array 2 can be 0 - 2 mm, and the second end extends to the bottom end of the micro-LED group 11.

[0060] In the above embodiments, the light-blocking member 5 can isolate the light path of each micro-LED group 11, thereby avoiding light leakage into the light path of adjacent micro-LED groups 11, as much as possible eliminating or reducing the light crosstalk between adjacent micro-LED groups 11, and better eliminating stray light, and further enhancing the printing effect.

[0061] It should be noted that in the micro-LED array 1, a light-blocking member 5 can also be disposed outside the outermost micro-LED group 11 to block and absorb the stray light generated outside, and further enhance the printing effect.

[0062] It can be understood that in the embodiments of the present invention, only the light-blocking member 5 can be provided, or only the microlens array can be provided, or both the light-blocking member 5 and the microlens array can be provided, and specific implementation can be selected according to actual needs.

[0063] In some embodiments, the micro light-emitting diode array 1 may include a plurality of micro light-emitting diode groups 11, and each micro light-emitting diode group 11 may include at least one micro light-emitting diode; the first lens array 2 includes a plurality of lens groups 21, and the plurality of lens groups 21 and the plurality of micro light-emitting diode groups 11 may correspond one by one.

[0064] Among them, the micro light-emitting diode group 11 may have only one micro light-emitting diode, so that one micro light-emitting diode corresponds to one lens group 21, which can better improve the imaging effect and thus better improve the printing accuracy. However, if one lens group 21 corresponds to one micro light-emitting diode, the size of the lens group 21 needs to be very small, resulting in inconvenience in processing and assembling the lens group 21.

[0065] Alternatively, the micro light-emitting diode group 11 may include a plurality of micro light-emitting diodes, so that one lens group 21 corresponds to a plurality of micro light-emitting diodes. In this case, the size of the lens group 21 can be increased, facilitating the processing and assembling of the lens group 21; however, if one lens group 21 corresponds to a plurality of micro light-emitting diodes, the imaging quality of the lens group 21 will be reduced, the imaging quality of the edge field of view will be reduced, and the imaging quality of each pixel will be uneven, thus reducing the printing accuracy.

[0066] In the embodiments of the present utility model, based on the pixel size of the micro light-emitting diode array 1, the micro light-emitting diode group 11 may include four micro light-emitting diodes, such that four micro light-emitting diodes correspond to one lens group 21. This can not only avoid the too small size of the lens group 21, thus facilitating the processing and installation of the lens group 21, but also ensure the imaging quality of the lens group 21 and the uniformity of the imaging quality of each pixel.

[0067] In some embodiments, the lens group 21 may include a first end face facing the material tank 3 and a second end face facing the micro light-emitting diode array 1; both the first end face and the second end face may be a free-form surface, a plane, or a convex arc surface.

[0068] Among them, the free-form surface (i.e., aspherical surface) has a higher degree of freedom, involving the existence of high-order images, which is more beneficial for correcting field curvature, and thus more conducive to improving the imaging effect and quality of the lens group 21; while the arc surface and the plane are easier to process, but the imaging effect and quality are slightly lower, and can be specifically selected according to actual needs during implementation. Specifically, a plane can be understood as an infinitely large arc surface.

[0069] In some embodiments, refer to Figure 4, the distance between the lens group 21 and the micro light-emitting diode array 1 in the optical axis direction is L1; the distance between the lens group 21 and the material tank 3 in the optical axis direction is L2. Among them, L1 ≥ L2.

[0070] Since a micro-lens 41 array needs to be arranged between the lens group 21 and the micro light-emitting diode array 1, therefore, L1 can be slightly larger than L2 to facilitate the arrangement of the micro-lens 41 array.

[0071] Among them, in terms of optics, L2 can be regarded as the back focal length. The back focal length refers to the distance from the rear surface of the lens to the focal point, while the focal length refers to the distance at which light converges to form an image after passing through the lens. The relationship between the back focal length and the focal length can be described by the lens formula: 1 / f = 1 / v - 1 / u, where f represents the focal length, v represents the image distance (the distance from the image to the lens), and u represents the object distance (the distance from the object to the lens). In this formula, the back focal length can be expressed as v - f. Therefore, the relationship between the back focal length and the focal length is that the back focal length is equal to the image distance minus the focal length. Since the focal length of this system is small, the back focal length will also be small.

[0072] In some embodiments, 0 ≤ L1 ≤ 4 mm; 0 ≤ L2 ≤ 3 mm.

[0073] In some embodiments, refer to Figure 4 , the radius of curvature of the first end face of the lens group 21 is R1; the radius of curvature of the second end face of the lens group 21 is R2; among them, L1 ≤ |R1| + |R2|; L2 ≤ |R1| + |R2|.

[0074] It can be understood that the larger the absolute value of the radius of curvature, the flatter the curved surface, and the worse the light-condensing energy of the lens group 21. The smaller the absolute value of the radius of curvature, the greater the curvature of the curved surface, and the better the light-condensing energy of the lens group 21. Therefore, the smaller the value of |R1| + |R2|, the more the light-condensing energy of the lens group 21 can be improved, thereby improving the imaging quality.

[0075] In the above embodiments, L1 ≤ |R1| + |R2|, L2 ≤ |R1| + |R2|, which means that L1 and L2 can be small enough so that almost all light rays can pass through the lens group 21, thereby improving the imaging efficiency of the lens group 21. Moreover, L1 and L2 can be small enough to reduce the volume of the stereolithography 3D printing device, facilitating its miniaturization.

[0076] In some embodiments, the focal length of the lens group 21 can be 0 - 10 mm; and the focal length of the micro-lens 41 is actually L1, 0 ≤ L1 ≤ 4 mm. When the focal length of the lens group 21 and the focal length of the micro-lens 41 are within this parameter range, the image formed by the converging light can be at the set position, and the size of the light spot when the light reaches the resin is limited within a suitable range, avoiding the situation that the model edge curing accuracy is poor due to the too large light spot.

[0077] In some embodiments, referring to Figure 4 , the diameter of the lens group 21 is D; the height of the lens group 21 is H; wherein, H:D≥3:1. Thus, it is possible to avoid too small a ratio of height to diameter, thereby improving the light-concentrating energy of the lens group 21 and the imaging quality of the lens group 21.

[0078] In some embodiments, if the micro light-emitting diode array 1 includes a plurality of the micro light-emitting diodes, the diameter of the micro light-emitting diode is 10 to 100 μm, and the light-emitting angle of the micro light-emitting diode is any value between 60° and 120°

[0079] Among them, by setting the diameter of the light source to be 10 to 100 μm and setting the light-emitting angle to be any value between 60° and 120°, a high-resolution display effect can be achieved. By imaging the image displayed by the micro light-emitting diode array 1 through the first lens array 2 in the material tank 3 to cure the light-curable material, the printing speed and printing accuracy can be improved, and it can be ensured that the light energy has a high usage efficiency, reduce light loss, and save usage costs.

[0080] Embodiment 1. A light-curing three-dimensional printing device, comprising:

[0081] A micro light-emitting diode array 1, a first lens array 2, and a material tank 3;

[0082] The first lens array 2 and the material tank 3 are arranged on the outgoing light path of the micro light-emitting diode array 1. The first lens array 2 is located between the micro light-emitting diode array 1 and the material tank 3, and the first lens array 2 can image and converge the light emitted by the micro light-emitting diode array 1 in the material tank 3.

[0083] Embodiment 2. The light-curing three-dimensional printing device according to Embodiment 1, further comprising:

[0084] A second lens array 4. The second lens array 4 is arranged on the outgoing light path of the micro light-emitting diode array 1 and is located between the micro light-emitting diode array 1 and the first lens array 2. The second lens array 4 is used to reduce the light-emitting angle of the micro light-emitting diode array 1.

[0085] Embodiment 3. The light-curing three-dimensional printing device according to Embodiment 2,

[0086] The second lens array 4 is used to reduce the light-emitting angle of the micro light-emitting diode array 1 to 1 to 30 degrees.

[0087] Embodiment 4. The light-curing three-dimensional printing device according to Embodiment 2,

[0088] The second lens array 4 is an array of microlenses 41. The microlens array 41 includes a plurality of microlenses 41. The microlenses 41 are plano-convex lenses or biconvex lenses, and the convex surface of the microlens 41 is a free-form surface or an arc surface;

[0089] If the microlens 41 is a plano-convex lens, the convex surface of the microlens 41 faces the first lens array 2, and the flat surface of the microlens 41 faces the micro light-emitting diode array 1;

[0090] If the microlens 41 is a biconvex lens, one convex surface of the microlens 41 faces the first lens array 2, and the other convex surface of the microlens 41 faces the micro light-emitting diode array 1.

[0091] Example 5. The stereolithography three-dimensional printing apparatus according to Example 4,

[0092] The distance between the microlens 41 and the light-emitting surface of the micro light-emitting diode array 1 is 0-2 mm.

[0093] Example 6. The stereolithography three-dimensional printing apparatus according to Example 1,

[0094] The micro light-emitting diode array 1 includes a plurality of micro light-emitting diode groups 11, and the micro light-emitting diode group 11 includes at least one micro light-emitting diode;

[0095] The stereolithography three-dimensional printing apparatus further includes a plurality of light-blocking members 5, and a light-blocking member 5 is disposed between two adjacent micro light-emitting diode groups 11.

[0096] Example 7. The stereolithography three-dimensional printing apparatus according to Example 6,

[0097] The light-blocking member 5 includes a first end and a second end facing away from each other. The first end extends to the first lens array 2, and the distance between the first end and the first lens array 2 is 0-2 mm. The second end extends to the bottom end of the micro light-emitting diode group 11.

[0098] Example 8. The stereolithography three-dimensional printing apparatus according to Example 1,

[0099] The micro light-emitting diode array 1 includes a plurality of micro light-emitting diode groups 11, and the micro light-emitting diode group 11 includes at least one micro light-emitting diode;

[0100] The first lens array 2 includes a plurality of lens groups 21, and the plurality of lens groups 21 correspond to the plurality of micro light-emitting diode groups 11 one by one.

[0101] Example 9. The stereolithography three-dimensional printing apparatus according to Example 8,

[0102] The micro light-emitting diode group 11 includes four micro light-emitting diodes, and the four micro light-emitting diodes correspond to one lens group 21.

[0103] Example 10. The light-curing three-dimensional printing device according to Example 8,

[0104] The lens group 21 includes a first end face facing the material tank 3 and a second end face facing the micro light-emitting diode array 1;

[0105] Both the first end face and the second end face are free-form surfaces, flat surfaces or outwardly convex arc surfaces.

[0106] Example 11. The light-curing three-dimensional printing device according to Example 8,

[0107] The distance between the lens group 21 and the micro light-emitting diode array 1 in the optical axis direction is L1;

[0108] The distance between the lens group 21 and the material tank 3 in the optical axis direction is L2;

[0109] Wherein, L1≥L2.

[0110] Example 12. The light-curing three-dimensional printing device according to Example 11,

[0111] 0≤L1≤4mm; 0≤L2≤3mm.

[0112] Example 13. The light-curing three-dimensional printing device according to Example 11,

[0113] The radius of curvature of the first end face of the lens group 21 is R1;

[0114] The radius of curvature of the second end face of the lens group 21 is R2;

[0115] Wherein, L1≤|R1|+|R2|; L2≤|R1|+|R2|.

[0116] Example 14. The light-curing three-dimensional printing device according to Example 8,

[0117] The focal length of the lens group 21 is 0-10mm.

[0118] Example 15. The light-curing three-dimensional printing device according to Example 8,

[0119] The diameter of the end face of the lens group 21 is D; the height of the lens group 21 is H;

[0120] Wherein, H:D≥3:1.

[0121] Example 16. The light-curing three-dimensional printing device according to Example 1,

[0122] The first lens array 2 includes a plurality of lens groups 21. The lens group 21 has a fisheye structure. The lens group 21 includes a plurality of lenses stacked along the optical axis direction. The shape of the lens close to the material tank 3 is an outwardly convex arc.

[0123] Example 17. The light-curing three-dimensional printing device according to Example 1,

[0124] The micro light-emitting diode array 1 includes a plurality of micro light-emitting diodes or a plurality of submillimeter light-emitting diodes.

[0125] Example 18. The light-curing three-dimensional printing device according to Example 17,

[0126] If the micro light-emitting diode array 1 includes a plurality of the micro light-emitting diodes, the diameter of the micro light-emitting diode is 10 to 100 μm, and the light-emitting angle of the micro light-emitting diode is any value in the range of 60° to 120°.

[0127] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the present invention in each embodiment.

Claims

1. A light-curing three-dimensional printing device, characterized in that: include: A micro light emitting diode array, a first lens array and a material trough; The first lens array and the material trough are arranged on the outgoing light path of the micro-LED array, the first lens array is located between the micro-LED array and the material trough, and the first lens array is used to image the light emitted by the micro-LED array and converge it in the material trough.

2. The light-curing 3D printing device according to claim 1, characterized in that: Also includes: The second lens array is arranged on the outgoing light path of the micro-LED array and is located between the micro-LED array and the first lens array. The second lens array is used to reduce the light emitting angle of the micro-LED array.

3. The light-curing 3D printing device according to claim 2, characterized in that: The second lens array is used to reduce the light emitting angle of the micro light emitting diode array to 1 to 30 degrees.

4. The light-curing 3D printing device according to claim 2, characterized in that: The second lens array is a microlens array, the microlens array includes a plurality of microlenses, the microlenses are plano-convex lenses or bi-convex lenses, and the convex surfaces of the microlenses are free-form surfaces or arc surfaces; If the microlens is a plano-convex lens, the convex surface of the microlens faces the first lens array, and the plane of the microlens faces the micro light emitting diode array; If the microlens is a double convex lens, one convex surface of the microlens faces the first lens array, and the other convex surface of the microlens faces the micro light emitting diode array.

5. The light-curing 3D printing device according to claim 4, characterized in that: The distance between the micro lens and the light emitting surface of the micro light emitting diode array is 0-2 mm.

6. The light-curing 3D printing device according to claim 1, characterized in that: The micro-LED array includes a plurality of micro-LED groups, each of which includes at least one micro-LED; The photocuring 3D printing device further comprises a plurality of light blocking members, wherein the light blocking members are arranged between two adjacent micro-LED groups.

7. The light-curing 3D printing device according to claim 6, characterized in that: The light blocking member includes a first end and a second end that are opposite to each other, the first end extends to the first lens array, and the distance between the first end and the first lens array is 0-2 mm, and the second end extends to the bottom end of the micro light emitting diode group.

8. The light-curing 3D printing device according to claim 1, characterized in that: The micro-LED array includes a plurality of micro-LED groups, each of which includes at least one micro-LED; The first lens array includes a plurality of lens groups, and the plurality of lens groups correspond one-to-one to the plurality of micro-LED groups.

9. The light-curing 3D printing device according to claim 8, characterized in that: The micro light emitting diode group includes four micro light emitting diodes, and the four micro light emitting diodes correspond to one lens group.

10. The light-curing 3D printing device according to claim 8, characterized in that: The lens group includes a first end surface facing the material slot and a second end surface facing the micro light emitting diode array; The first end surface and the second end surface are both free-form surfaces, plane surfaces or convex arc surfaces.

11. The light-curing 3D printing device according to claim 8, characterized in that: The distance between the lens group and the micro-LED array in the optical axis direction is L1; The distance between the lens group and the material tank in the optical axis direction is L2; Among them, L1≥L2.

12. The light-curing 3D printing device according to claim 11, characterized in that: 0≤L1≤4mm;0≤L2≤3mm.

13. The light-curing 3D printing device according to claim 11, characterized in that: The radius of curvature of the first end surface of the lens group is R1; The curvature radius of the second end surface of the lens group is R2; Among them, L1≤|R1|+|R2|; L2≤|R1|+|R2|.

14. The light-curing 3D printing device according to claim 8, characterized in that: The focal length of the lens group is 0-10 mm.

15. The light-curing 3D printing device according to claim 8, characterized in that: The diameter of the end surface of the lens group is D; the height of the lens group is H; Among them, H:D≥3:

1.

16. The light-curing 3D printing device according to claim 1, characterized in that: The first lens array includes a plurality of lens groups, each of which is a fisheye structure. The lens group includes a plurality of lenses stacked and arranged along the optical axis, and the shape of the lens close to the material trough is an outwardly convex arc.

17. The light-curing 3D printing device according to claim 1, characterized in that: The micro light emitting diode array includes a plurality of micro light emitting diodes or a plurality of sub-millimeter light emitting diodes.

18. The light-curing 3D printing device according to claim 17, characterized in that: If the micro light emitting diode array includes a plurality of micro light emitting diodes, the diameter of the micro light emitting diodes is 10 to 100 μm, and the light emitting angle of the micro light emitting diodes is any value between 60° and 120°.

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