Optical system and photocuring 3D printing equipment

Abstract

The invention provides an optical system and photocuring 3D printing equipment, and belongs to the technical field of printing equipment. The optical system comprises a plurality of light-emitting assemblies used for emitting light. A plurality of collimation assemblies, wherein one collimation assembly is arranged corresponding to each light emitting assembly; light of each light-emitting assembly penetrates through the collimation assembly and irradiates on a target plane to form an illumination area; the controller is electrically connected with each light-emitting component and is used for independently controlling each light-emitting component; the lighting areas of every two adjacent light-emitting assemblies are at least partially overlapped to form an overlapped area, and the light intensity of the overlapped area is 80%-120% of the light intensity of a non-overlapped area in the lighting areas. Wherein the plurality of light-emitting assemblies are independently controlled by the controller, and compared with a traditional full-on and full-off light source setting mode, light interference can be reduced, and the contrast ratio can be improved; the controller controls the opening number of the peripheral light-emitting assemblies, so that the light intensity of the overlapping area is 80%-120% of the light intensity of the non-overlapping area, the possibility that dark spots or bright spots appear in the overlapping area is reduced, and the good light uniformizing effect is achieved.

Description

Technical Field

[0001] This application belongs to the technical field of printing devices, and more specifically, relates to an optical system and a light-curing 3D printing device. Background Art

[0002] With the continuous development of science and technology, 3D printing technology has been increasingly widely used in people's lives. A light-curing 3D printing device projects light onto a light-transmitting tray at the bottom by means of an optical system, causing the photocurable material between the forming platform and the bottom of the tray to undergo a polymerization reaction to obtain a cured sheet. Using surface exposure (i.e., a predetermined area of the tray is irradiated with light) is beneficial for forming a cured layer in a single exposure. The light intensity in the irradiated area should be advantageously set to be uniform, and non-uniform light intensity may cause the thickness of the cured layer to be non-uniform.

[0003] Existing optical systems use LED lights and digital micromirror devices (DMDs). During use, all LED lights are activated, and the angles of the mirrors of the digital micromirror device are adjusted to achieve light intensity adjustment. Summary of the Invention

[0004] The purpose of the embodiments of this application is to provide an optical system and a light-curing 3D printing device, so as to solve the technical problem in the prior art that bright spots or dark spots are likely to appear in the LED splicing area of the optical system, affecting the printing quality of the light-curing 3D printing device.

[0005] To achieve the above purpose, the technical solution adopted in this application is: to provide an optical system for a light-curing 3D printing device, which includes: a plurality of light-emitting components, each of the light-emitting components being used to emit light for curing the printing material; a plurality of collimating components, the light emitted by each of the light-emitting components passing through a single collimating component and irradiating on a target plane to form an illumination area; a controller, the controller being capable of independently controlling each of the light-emitting components; wherein, the plurality of light-emitting components includes: a first light-emitting component; and a second light-emitting component adjacent to the first light-emitting component along a predetermined direction, wherein the illumination area of the first light-emitting component and the illumination area of the second light-emitting component at least partially overlap and have an overlapping area, and the total light intensity of the overlapping area is 80% - 120% of the light intensity of the non-overlapping area of the illumination area of the first light-emitting component or the second light-emitting component.

[0006] In some embodiments, the illumination areas of the first light-emitting component and the second light-emitting component have an intermediate area and an edge area, and the overlapping area is in the edge area of the illumination areas of the first and second light-emitting components.

[0007] In some embodiments, the total light intensity of the overlapping region is 90% to 100%, preferably 92% to 98%, more preferably 95% to 97% of the light intensity of the non-overlapping region of the illumination region of the first light-emitting component or the second light-emitting component.

[0008] In some embodiments, the optical system further includes a diffuser; the diffuser is disposed on a side of the collimating component away from the light-emitting component, and the diffuser is configured to diffuse the light passing through the collimating component.

[0009] In some embodiments, the distance between the central axis of the first light-emitting component and the central axis of the second light-emitting component is d. After the light emitted by each light-emitting component passes through the corresponding collimating component and is adjusted by the diffuser, a light spot with a diameter of D is formed on the target plane, where D = 2 * d * n and n is a positive integer.

[0010] In some embodiments, when n = 1, along the predetermined direction, the length of the overlapping region is half of the length of the illumination region of the first light-emitting component or the second light-emitting component; or when n = 2, along the predetermined direction, the length of the overlapping region is three-quarters of the length of the illumination region of the first light-emitting component or the second light-emitting component.

[0011] In some embodiments, the plurality of light-emitting components further includes: a third light-emitting component adjacent to the second light-emitting component along the predetermined direction, wherein at least a part of the illumination region of the second light-emitting component and the illumination region of the third light-emitting component overlap and have a second overlapping region, and the total light intensity of the second overlapping region is 80% to 120% of the light intensity of the non-overlapping region of the illumination region of the third light-emitting component.

[0012] In some embodiments, the collimation angle of the collimating component is -10° to 10°, preferably -5° to 5°, more preferably -2° to 2°.

[0013] In some embodiments, the optical system further includes a first mask, the first mask is located between the collimating component and the target plane, the first mask includes a frosted area and a transparent area, the transparent area is correspondingly disposed with the non-overlapping region, and the frosted area is correspondingly disposed with the overlapping region.

[0014] In some embodiments, the optical system further includes a second mask, the second mask is arranged on a side of the collimating component away from the light-emitting component, and the first mask is configured to selectively reduce the light emitted by the plurality of light-emitting components.

[0015] In some embodiments, the second mask includes an LCD screen.

[0016] In some embodiments, the plurality of light-emitting components are arranged in an array, in a staggered arrangement, or in an embedded arrangement.

[0017] In some embodiments, the optical system further includes a light-shielding element located between the light-emitting assembly and the collimating assembly; the light-shielding element includes a plurality of channels, and a single channel is aligned with a single light-emitting assembly and a single collimating assembly.

[0018] In some embodiments, the cross-section of the channel is any one of a triangle, a rectangle, a regular hexagon, a regular octagon, or a regular decagon.

[0019] In some embodiments, each light-emitting assembly includes: a single LED; or a plurality of LEDs that emit light in the same wavelength band.

[0020] In some embodiments, a single light-emitting assembly includes a first LED and a second LED, the first LED is configured to emit light in a first wavelength band, the second LED is configured to emit light in a second wavelength band, and the first wavelength band is different from the second wavelength band.

[0021] The present application also provides a light-curing 3D printing device, which includes: a forming platform configured to adhere at least one cured layer; a loading device configured to load printing material; a driving assembly configured to drive the forming platform to move closer to or away from the loading device; and the aforementioned optical system, and the light emitted by the optical system is configured to cure the printing material to form the cured layer.

[0022] In some embodiments, the light-curing 3D printing device further includes a dead pixel detection device configured to detect whether the LEDs in the light-emitting assembly are damaged.

[0023] The present application also provides an operation method of a light-curing 3D printing device, which includes: using the first plurality of light-emitting assemblies of the optical system to emit light and project light onto the printing material in the loading device to form a first cured layer with a first profile; then using the second plurality of light-emitting assemblies of the optical system to emit light and project light onto the printing material in the loading device to form a second cured layer with a second profile, wherein the first plurality of light-emitting assemblies is different from the second plurality of light-emitting assemblies.

[0024] The beneficial effects of the optical system provided by this application are as follows: Compared with the prior art, multiple light-emitting components in the optical system of this application are independently controlled by a controller. During printing, the controller controls the corresponding light-emitting components to emit light. Compared with the traditional light source setting method of full-on and full-off, it can reduce the light interference between the light-emitting components, which helps to improve the contrast. At the same time, the independent control of the light-emitting components helps to regulate the light intensity in the overlapping area. By controlling the number of surrounding light-emitting components turned on by the controller, the light intensity in the overlapping area is 80% - 120% of the light intensity in the non-overlapping area. Thus, the light intensity in the overlapping area and the non-overlapping area is similar or equal, reducing the possibility of dark or bright spots appearing in the overlapping area and achieving a better light homogenization effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of this application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of this application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0026] Figure 1 One of the optical path schematic diagrams of the optical system provided by the embodiment of this application;

[0027] Figures 2A - 2B The energy distribution schematic diagram of the light spot formed after the light rays emitted by the optical components provided by some embodiments of this application pass through the collimating component;

[0028] Figure 3 The energy distribution curves of the light rays emitted by multiple optical components provided by the embodiment of this application before and after fusion on the target plane;

[0029] Figure 4 The optical path schematic diagram of the optical system provided by some embodiments of this application;

[0030] Figure 5 The optical path schematic diagram of the optical system provided by other embodiments of this application;

[0031] Figures 6A - 6B The light intensity distribution diagrams of the light rays emitted by the optical components provided by the embodiment of this application before and after passing through the diffuser;

[0032] Figures 7A - 7B The light intensity distribution curve of the combination of multiple light spots provided by some embodiments of this application;

[0033] Figures 8A - 8C The schematic diagram of the optical system with a mask provided by some embodiments of this application;

[0034] Figures 9A - 9DSchematic diagram of an optical system with a mask provided by some embodiments of the present application;

[0035] Figures 10A - 10F Schematic diagram of the layout of a light-emitting component or a collimating lens provided by some embodiments of the present application;

[0036] Figure 11 Schematic diagram of the optical path of an optical system with a light-shielding element provided by an embodiment of the present application;

[0037] Figures 12A - 12E Schematic diagram of the structure of an optical module provided by an embodiment of the present application;

[0038] Figure 13 Schematic diagram of the structure of a light-shielding element provided by an embodiment of the present application;

[0039] Figure 14 Shows a light-curing 3D printing device according to some embodiments;

[0040] Figure 15 Shows a light-curing 3D printing device according to some embodiments. Detailed implementation manners

[0041] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0042] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0043] It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0044] In addition, the terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, "a plurality of" means two or more, unless otherwise specifically defined.

[0045] Please refer to Figure 1 , the optical system provided by the embodiment of this application includes a light-emitting component 101, a collimating component 102, and a controller. The light-emitting component 101 is configured to emit light. There are a plurality of both the light-emitting component 101 and the collimating component 102, and each light-emitting component 101 is configured with a collimating component 102. The collimating component 102 is used to collimate the light emitted by the corresponding light-emitting component 101. The controller is electrically connected to each light-emitting component 101 and can separately control the startup or shutdown of each light-emitting component 101, or control the light-emitting intensity of the light-emitting component 101.

[0046] The light from the light-emitting component 101 passes through the collimating component 102 and irradiates on the target plane 104 to form an illumination area. The illumination areas of two adjacent light-emitting components 101 at least partially overlap to form an overlapping area, and the light intensity of the overlapping area is 80% - 120% of the light intensity of the non-overlapping area in the illumination area, preferably 85% - 115%, preferably 90% - 110%, preferably 95% - 105%, such as 96%, 97%, 98%, 99%, 100%, 101%, 102%, 103%, 104%, 105%.

[0047] The light spot formed by each light-emitting component 101 on the target plane 104 is divided into a central area S201 and an edge area S202, and the light intensity of the central area S201 is greater than that of the edge area S202. Among them, the light intensity of the central area S201 is basically uniform, and the light intensity of the edge area S202 gradually decreases along the direction away from the central area. Taking the example that a single light-emitting component 101 forms a quadrilateral light spot on the target plane 104, please refer to Figure 2A , the light intensity of the light spot is strong and uniform within the central area S201, and gradually decreases to zero along the direction away from the central area in the edge area S202, and the light intensity distribution is generally in the shape of an isosceles trapezoid.

[0048] In the related design, bright spots or dark spots are likely to appear in the combined light spot formed by a plurality of light-emitting components 101, resulting in uneven light spots. Please refer to Figure 2B , the light spots formed by two adjacent light-emitting components 101 on the target plane 104 have an overlapping area S210, and the overlapping area S210 is formed by the overlapping of the edge areas S202 of the two light spots, for example.

[0049] To avoid bright spots or dark spots, the light intensity of the edge region S202 is enhanced by overlapping, making it basically the same as the light intensity of the central region S201. In one example, after a light-emitting component 101 emits light, other light-emitting components 101 adjacent to the light-emitting component 101 are controlled to emit light, so that the light intensity of the edge region of the light spot of the light-emitting component 101 on the target plane is increased due to the adjacent light-emitting components 101, thereby making the light intensity of the overlapping region S210 of the light spot and the light intensity of the central region S201 basically the same.

[0050] In one example, a first light-emitting component 101 forms a first illumination region on a target plane 104, and a second light-emitting component 101 adjacent to the first light-emitting component 101 forms a second illumination region on the target plane 104. The first illumination region and the second illumination region form an overlapping region on the target plane 104, and the light intensity of the overlapping region is the sum of the illumination light intensity of the first light-emitting component in the overlapping region and the illumination light intensity of the second light-emitting component in the overlapping region. The light intensity of the non-overlapping region in the first illumination region is the illumination light intensity of the first light-emitting component at the central region of the first illumination region. The light intensity of the non-overlapping region in the second illumination region is the illumination light intensity of the second light-emitting component at the central region of the second illumination region.

[0051] In one example, the light intensity of the non-overlapping region in the first illumination region is the same as the light intensity of the non-overlapping region in the second illumination region, and the light intensity of the overlapping region is 80% - 120% of the light intensity of the non-overlapping region in the first illumination region and is also 80% - 120% of the light intensity of the non-overlapping region in the second illumination region. Thus, the first illumination region and the second illumination region are fused to form a uniform light spot. For example, the light intensity (light power density) of the non-overlapping region in the first illumination region is 30 mW / cm 2 ², the light intensity of the non-overlapping region in the second illumination region is 30 mW / cm 2 ², and the light intensity of the overlapping region of the first or second illumination region is 28 mW / cm 2 ², 29 mW / cm 2 ², 30 mW / cm 2 ², 31 mW / cm 2 ², 32 mW / cm 2 .

[0052] In one example, the light intensity of the non-overlapping region in the first illumination region is different from the light intensity of the non-overlapping region in the second illumination region, and the light intensity of the overlapping region is 80% - 120% of the light intensity of the non-overlapping region in the first illumination region and is also 80% - 120% of the light intensity of the non-overlapping region in the second illumination region. Thus, the first illumination region and the second illumination region are fused to form a uniform light spot. For example, the light intensity of the non-overlapping region in the first illumination region is 30 mW / cm 2 ², and the light intensity of the non-overlapping region in the second illumination region is 35 mW / cm²2 , the light intensity of the overlapping area of the first or second illumination area is 30 mW / cm 2 , 31 mW / cm 2 , 32 mW / cm 2 , 33 mW / cm 2 , 35 mW / cm 2 .

[0053] The light emitted by the light-emitting component 101 is ultraviolet light or visible light of a specific wavelength and energy, and the light can act on the printing material to achieve a curing effect. In one embodiment, each light-emitting component 101 has only one LED. In another embodiment, the light-emitting component 101 includes two, three or more LEDs. When the light-emitting component 101 includes multiple LEDs, the light bands emitted by the multiple LEDs in the same light-emitting component 101 can be the same or different. The structures of the multiple light-emitting components 101 can be the same or different. For example, some of the multiple light-emitting components 101 only include one LED, and some of the multiple light-emitting components 101 include multiple LEDs. Or, each light-emitting component 101 includes multiple LEDs.

[0054] The "LED" in this article includes various types of LEDs, such as Mini Led and Micro Led. The chip size of the LEDs in this article is, for example, 20 μm to 500 μm, for example, 40 μm to 400 μm, for example, 50 μm to 200 μm.

[0055] In some embodiments, the target plane 104 is an LCD screen.

[0056] In some embodiments, the target plane 104 is the film of a tray containing the printing material.

[0057] In some embodiments, the target plane 104 is a mask.

[0058] In some embodiments, the target plane 104 is the plane between the light-emitting component and the LCD screen.

[0059] In some embodiments, the target plane 104 is the liquid surface of the printing material contained in the tray. For example, the light emitted by the light-emitting component 101 directly or indirectly irradiates the liquid surface (upper surface) of the printing material.

[0060] Based on the pattern of the slice layer to be cured of the object, the controller controls at least one of all the light-emitting components 101 to emit light. All the light-emitting components of the optical system are independently controlled. For example, the controller can control 10, 20, or 50 light-emitting components among all the light-emitting components 101 to emit light simultaneously, rather than having to start or turn off all the light-emitting components at the same time.

[0061] In some embodiments, by designing the installation spacing between two adjacent light-emitting components, the light intensity in the overlapping area of the light spots of two adjacent light-emitting components on the target plane is 80% to 120% of the light intensity in the non-overlapping area. For example, the light intensity in the overlapping area is 90%, 100%, or 110% of the light intensity in the non-overlapping area in the first area.

[0062] For the optical system provided in this application, multiple light-emitting components 101 are independently controlled by a controller. When printing, the controller controls one or more corresponding light-emitting components 101 to emit light. Compared with the existing full-on or full-off of light-emitting components, it can save energy. In addition, in a 3D printer with an LCD screen, as a mask, the LCD screen may allow unwanted light to pass through (for example, when the gray level is set to 0). Although the light intensity of the passing light is weakened, this is also disadvantageous. Some of the light-emitting components 101 of the optical system in this application emit light during operation, while the remaining light-emitting components 101 do not emit light, basically avoiding unwanted light from passing through the mask or the LCD screen and improving the contrast.

[0063] There are 100 to 15,000 light-emitting components 101 installed on the mounting plate. For example, 1,000 light-emitting components 101 are installed on the mounting plate. The overlapping area of two adjacent light-emitting components 101 on the target plane 104 is associated with the mounting dimensions of these two light-emitting components 101.

[0064] For a type of stereolithography 3D printing device, the area for exposure is limited by the device size. Therefore, the area of the mounting plate (on which multiple light-emitting components are installed) is also limited. Those skilled in the art can understand that on a mounting plate with the same area, a larger number of light-emitting components 101, such as 2,000, can be installed, or a smaller number of light-emitting components 101, such as 180, can be installed. Different numbers of light-emitting components 101 are suitable for different mounting dimensions (such as installation spacing) and structural designs. In addition, different numbers of light-emitting components 101 are suitable for different types (such as different sizes) of LEDs.

[0065] In some embodiments, there are multiple (such as 200) light-emitting components 101 installed on the mounting plate. The arrangement of these light-emitting components 101 allows the light spots of two adjacent light-emitting components 101 on the target plane 104 to have an overlapping area, for example, only overlapping in the edge area of the light spot.

[0066] In some embodiments, a plurality of (e.g., 1000) light-emitting components 101 are mounted on the mounting plate, and these light-emitting components 101 are compact. Limited by this compact arrangement and the propagation distance of the light emitted by the light-emitting components, the mixing light distance (optical distance) between adjacent light-emitting components 101 is inevitable. In other words, the light spots of two adjacent light-emitting components 101 on the target plane 104 have an overlapping area. For example, a part of the central area and the edge area of the light spots overlap, which makes the light intensity of at least a part of the overlapping area always undesirably greater than that of the non-overlapping area. At least to avoid this defect, the present application makes the area / length of the overlapping area of two adjacent light spots occupy half of the area / length of a single light spot (e.g., refer to Figure 4 ), which will be described in detail later.

[0067] In some embodiments, the light intensity of the light spot formed after the light emitted by each light-emitting component passes through the collimating component is roughly arranged in an isosceles trapezoid. Refer to Figure 3 . The light intensity of the light spot formed after the light emitted by three light-emitting components is fused on the target plane is higher in the overlapping area than in the non-overlapping area. In some embodiments, the light intensity in the overlapping area may also be lower than that in the non-overlapping area.

[0068] Refer to Figure 4 . The optical system includes a light-emitting component 401, a collimating component 402, and a compound eye array (or diffuser) 403. The compound eye array 403 is disposed on the side of the collimating component 402 away from the light-emitting component 401 for diffusing the light passing through the collimating component 402. The light passing through the compound eye array 403 forms a plurality of light spots on the target plane 404, and adjacent light spots have an overlapping area.

[0069] Refer to Figure 6A for the left light spot image. For example, the light spot formed by the light emitted by a single light-emitting component 401 before passing through the compound eye array 403 after passing through the collimating component 402 is a regular hexagon, and the light intensity in the central area of the light spot is stronger, and the light intensity in the edge area of the light spot is weaker. Refer to Figure 6A for the right light spot image. For example, after the light emitted by a single light-emitting component 401 passes through the collimating component 402 and the compound eye array 403 in sequence, it diffuses around, the area of the central area maintaining the original light intensity shrinks, the area of the edge area expands, and the total area of this light spot expands.

[0070] Taking the light spot formed by the light of each light-emitting component 401 on the target plane as a regular hexagon as an example, refer to Figure 6BIn the left illumination area, the light spots of multiple light-emitting components 401 before entering the compound eye array 403 are formed by splicing multiple regular hexagons. At this time, there is an obvious difference in the light intensity between the overlapping area (at the edge area of the regular hexagon) and the non-overlapping area (at the center area of the regular hexagon), resulting in bright spots during printing. Refer to Figure 6B In the right illumination area, the light intensity of most areas (the central area) of the combined light spot formed on the target plane 404 after the light rays emitted by multiple light-emitting components 401 are adjusted by the compound eye array 403 is basically the same.

[0071] Refer to Figure 4 and Figure 6A , thus, when multiple light-emitting components 401 emit light, the light rays emitted by each light-emitting component 401 will be more diffused into the illumination area of adjacent light-emitting components 401 and at the same time the light rays emitted by adjacent light-emitting components 401 will also be more diffused into the illumination area of this light-emitting component 401 after being adjusted by the collimating component 402 and the compound eye array 403. Thus, the size of the overlapping area is increased, and the uniform distribution of light energy is achieved through the superposition of the light rays of adjacent multiple light-emitting components 401. The center axis spacing between two adjacent light-emitting components 401 is d, and after the light rays emitted by each light-emitting component 401 pass through the corresponding collimating component 402 and are diffused by the compound eye array 403, a light spot with a diameter of D is formed on the target plane 404. Among them, D > d.

[0072] In some embodiments, the central axis of the light-emitting component 401 refers to the geometric center of the LED.

[0073] In Figure 4 In the illustrated embodiment, three light-emitting components 401 are arranged along a predetermined direction, such that the light rays emitted by the middle light-emitting component 401 approach or reach the central axes of the light-emitting components 401 on both sides after passing through the collimating component 402 and the compound eye array 403. Similarly, the light rays emitted by each of the light-emitting components 401 on both sides approach or reach the central axis of the middle light-emitting component 401 after passing through the collimating component 402 and the compound eye array 403. Those skilled in the art can understand that along the predetermined direction in which the light-emitting components 401 are arranged, the length of the overlapping area between the light spot formed by the middle light-emitting component 401 and the light spot formed by an adjacent single light-emitting component 401 is equal to the length of the non-overlapping area. In other words, along the predetermined direction in which the light-emitting components 401 are arranged, the length of the overlapping area between the light spot formed by the middle light-emitting component 401 and the light spot formed by an adjacent single light-emitting component 401 is equal to half of the length of the light spot. As Figure 4 shown, D = 2d, and the light intensity of the overlapping area of the light spot is determined by two light-emitting components 401.

[0074] In Figure 5In the illustrated embodiment, eight light-emitting components 411 are arranged in a predetermined direction such that the light emitted by the third light-emitting component 411 approaches or reaches the central axes of the first and fifth light-emitting components 411 after passing through the collimating component 412 and the fly-eye array 413. Similarly, the light emitted by the fourth light-emitting component 411 approaches or reaches the central axes of the second and sixth light-emitting components 411 after passing through the collimating component 412 and the fly-eye array 413. Similarly, the light emitted by the fifth light-emitting component 411 ultimately approaches or reaches the central axes of the third and seventh light-emitting components 411. The light emitted by the sixth light-emitting component 411 ultimately approaches or reaches the central axes of the fourth and eighth light-emitting components 411. Those skilled in the art can understand that along the predetermined direction in which the light-emitting components are arranged, the length of the overlapping region between the light spot formed by the middle light-emitting component and the light spot formed by the adjacent single light-emitting component is equal to one-fourth of the length of the light spot. As Figure 5 shown, D = 4d, and the light intensity of the overlapping region of the light spot is determined by four light-emitting components.

[0075] Similarly, D = 2*d*n. Where D is the length / diameter of the light spot formed after the light emitted by a single light-emitting component is collimated and diffused; d is the distance between the central axes of two adjacent light-emitting components; and n is an integer, such as 1, 2, 3, 4.

[0076] In Figure 4 and Figure 5 the illustrated embodiment, a first light-emitting component and a second light-emitting component adjacent to the first light-emitting component in a predetermined direction are arranged. The illumination area of the first light-emitting component and the illumination area of the second light-emitting component partially overlap and have an overlapping region.

[0077] In Figure 4 , along the aforementioned predetermined direction, the length of the overlapping region is half of the length of the illumination area of the first light-emitting component or the second light-emitting component. Due to the arrangement of the diffuser, when only the first light-emitting component and the second light-emitting component are activated, the total light intensity of the overlapping region is 80% - 120% of the light intensity of the non-overlapping region of the illumination area of the first light-emitting component or the second light-emitting component.

[0078] In Figure 5 , along the aforementioned predetermined direction, the length of the overlapping region is three-fourths of the length of the illumination area of the first light-emitting component or the second light-emitting component. Due to the arrangement of the diffuser, the light spot size becomes larger and the light intensity uniformity of a single light spot becomes lower. When only the first light-emitting component and the second light-emitting component are activated, the total light intensity of the overlapping region is, for example, 180% - 300% of the light intensity of the non-overlapping region of the illumination area of the first light-emitting component or the second light-emitting component. When eight light-emitting components adjacent in a predetermined direction are activated, the light intensity of the overlapping region simultaneously affected by four light-emitting components is substantially uniform.

[0079] For example, the light intensity of the non-overlapping area of the illumination area of the first light-emitting component is 30 mW / cm 2 , and the light intensity of the overlapping area of the illumination area of the first light-emitting component (i.e., the overlapping area of the illumination area of the second light-emitting component) is 60 mW / cm 2 , and the light intensity of the non-overlapping area of the illumination area of the second light-emitting component is 30 mW / cm 2 .

[0080] It can be understood that if three or more light-emitting components adjacent along a predetermined direction are started simultaneously, all of the illumination areas of one or more of these light-emitting components partially overlap with other light-emitting components. For example, the illumination area of one light-emitting component overlaps with two adjacent illumination areas simultaneously (see Figure 4 ), or the illumination area of one light-emitting component overlaps with three adjacent illumination areas simultaneously (see Figure 5 ).

[0081] Refer to Figure 7A , the light intensity distribution of the light spot after the light emitted by the light-emitting component 401 passes through the collimating component 402 and the fly-eye array 403 is parabolic (i.e., high light intensity in the middle and low light intensity at the edges). The light emitted by three light-emitting components 401 passes through the collimating component 402 and the fly-eye array 403 in sequence and then fuses on the target plane 404. The fused light spot is generally an isosceles trapezoid. In other words, the light intensity of most areas of the area irradiated by the light-emitting component is uniform. Refer to Figure 7B , the light spot size of the light emitted by a single light-emitting component 401 after passing through the collimating component 402 and the fly-eye array 403 is larger, and the light emitted by three light-emitting components 401 passes through the collimating component 402 and the fly-eye array 403 in sequence and then fuses on the target plane 404. Different from Figure 7A , Figure 7B the area irradiated by the light-emitting component in Figure 7A is affected by at most three light-emitting components, while the area irradiated by the light-emitting component in

[0082] is affected by at most two light-emitting components. [[ID=4 Combined with ​ , adjusting the distance between the fly-eye array 403 and the target plane 404 can control the size and light intensity of the light spot formed on the target plane 404.

[0083] For some embodiments with limited installation size, ​ the scheme shown is advantageous, which makes full use of the coverage rate of the overlapping area to achieve uniform light intensity instead of avoiding the occurrence of overlapping areas.

[0084] In one embodiment of the present application, only one of the rear surface type and the front surface type of each cell of the compound eye array 403 is a convex surface. In another embodiment of the present application, both the rear surface type and the front surface type of each cell of the compound eye array 403 are convex surfaces.

[0085] In one embodiment of the present application, the cells of the compound eye array 403 are arranged in a honeycomb pattern. In addition, the cells of the compound eye array 403 can also be arranged in a matrix pattern or a spiral pattern. As long as the size of each cell in the compound eye array 403 is smaller than the size of each cell in the collimating component 402.

[0086] In another embodiment of the present application, the collimation angle of the collimating component 402 (the angle of the light emitted by the light-emitting component after being collimated relative to the central axis of the light-emitting component) is -10° to 10°, preferably -5° to 5°, more preferably -2° to 2°. For example, 1°, 2°, 3°, 4°, 5°, 6°, 7°, 8°, 9°, 10°.

[0087] Referring to FIG. 8, the optical system is configured with a first mask 805 to permanently reduce the light intensity of a part of the light emitted by the light-emitting component 801. Refer to ​ , the optical system includes a light-emitting component 801, a collimating component 802, a first mask 805, and a controller. The light-emitting component 801 is configured to emit light. There are multiple light-emitting components 801 and collimating components 802, and each light-emitting component 801 is configured with a collimating component 802. The collimating component 802 is used to collimate the light emitted by the corresponding light-emitting component 801. The first mask 805 is located between the collimating component 802 and the target plane 804. The controller is electrically connected to each light-emitting component 801 and can individually control each light-emitting component 801.

[0088] Refer to ​ , the optical system includes a light-emitting component 801, a collimating component 802, a first mask 805, a compound eye array 803, and a controller. The light-emitting component 801 is configured to emit light. There are multiple light-emitting components 801 and collimating components 802, and each light-emitting component 801 is configured with a collimating component 802. The collimating component 802 is used to collimate the light emitted by the corresponding light-emitting component 801. The first mask 805 is located between the collimating component 802 and the compound eye array 803. The compound eye array 803 is arranged on the side of the collimating component 802 away from the light-emitting component 801, and the compound eye array 803 is used to diffuse the light passing through the collimating component 802. The light exiting the compound eye array 803 forms an illumination area on the target plane 804. The controller is electrically connected to each light-emitting component 801 and can individually control each light-emitting component 801.

[0089] Refer to ​, in some embodiments, the first mask 805 includes a frosted area 822 and a transparent area 821. The transparent area 821 is correspondingly arranged with the non-overlapping area of the light-emitting component 801, and the frosted area 822 is correspondingly arranged with the overlapping area to reduce the light intensity of the overlapping area.

[0090] The first mask 805 is configured to permanently reduce the light intensity of the light emitted by the plurality of light-emitting components 801. The frosted area 822 reduces the intensity of the light while the light passes through, and the transparent area 821 allows the light to pass through smoothly. Specifically, the energy distribution curve of the light emitted by the light-emitting component 801 is an isosceles trapezoid after passing through the collimating component 802, and the waist area of the isosceles trapezoid is modulated by the frosted area 822 of the first mask 805.

[0091] Referring to FIG. 9, the optical system includes a second mask 9, and the second mask 906 is configured to selectively reduce the light emitted by the plurality of light-emitting components 901. In one embodiment, referring to ​ , the optical system includes a light-emitting component 901, a collimating component 902, a second mask 906, and a controller. The light-emitting component 901 is configured to emit light. There are a plurality of light-emitting components and collimating components 902, and each light-emitting component 901 is configured with a collimating component 902. The collimating component 902 is used to collimate the light emitted by the corresponding light-emitting component 901. The light passing through the collimating component 902 irradiates on the second mask 906. The second mask 906 is a mask structure arranged in front of the target plane 904, and the light forms an illumination area on the target plane 904 after passing through the second mask 906. The controller is electrically connected to each light-emitting component 901 and can individually control each light-emitting component 901. In addition, the second mask 906 can be the target plane 904, and the light forms an illumination area directly on the second mask 906 after passing through the collimating component.

[0092] Referring to ​ , the optical system includes a light-emitting component 901, a collimating component 902, a compound eye array 903, a second mask 906, and a controller. The light-emitting component 901 is configured to emit light. There are a plurality of light-emitting components and collimating components 902, and each light-emitting component 901 is configured with a collimating component 902. The collimating component 902 is used to collimate the light emitted by the corresponding light-emitting component 901. The compound eye array 903 is arranged on the side of the collimating component 902 away from the light-emitting component 901, and the compound eye array 903 is used to diffuse the light passing through the collimating component 902. The second mask 906 is a mask structure in front of the target plane 904, and the light passing through the compound eye array 903 irradiates on the second mask 906 and then forms an illumination area on the target plane 904. The controller is electrically connected to each light-emitting component 901 and can individually control each light-emitting component 901. Alternatively, the second mask 906 can be the target plane 904.

[0093] See​ , the optical system includes a light-emitting component 901, a collimating component 902, a first mask 905, a second mask 906, and a controller. The light-emitting component 901 is configured to emit light. There are multiple light-emitting components 901 and collimating components 902, and each light-emitting component 901 is configured with a collimating component 902. The collimating component 902 is used to collimate the light emitted by the corresponding light-emitting component 901. The second mask 906 is the target plane 904. The light passing through the collimating component 902 first passes through the first mask 905 and is permanently reduced in light intensity and then irradiates on the second mask 906. The controller is electrically connected to each light-emitting component 901 and can individually control each light-emitting component 901.

[0094] Refer to ​ , the optical system includes a light-emitting component 901, a collimating component 902, a first mask 905, a compound eye array 903, a second mask 906, and a controller. The light-emitting component 901 is configured to emit light. There are multiple light-emitting components 901 and collimating components 902, and each light-emitting component 901 is configured with a collimating component 902. The collimating component 902 is used to collimate the light emitted by the corresponding light-emitting component 901. The compound eye array 903 is arranged on the side of the collimating component 902 away from the light-emitting component 901, and the compound eye array 903 is used to diffuse the light passing through the collimating component 902. The first mask 905 is arranged between the collimating component 902 and the compound eye array 903. The second mask 906 is arranged on the side of the compound eye array 903 away from the collimating component 902. Optionally, the second mask 906 is a mask structure in front of the target plane 904. The light passing through the compound eye array 903 irradiates on the second mask 906, and after passing through the second mask 906, it irradiates on the target plane 904 to form an illumination area. The controller is electrically connected to each light-emitting component 901 and can individually control each light-emitting component 901. In addition, the second mask 906 can also directly serve as the target plane, and the light passing through the compound eye array 903 directly forms a printed image on the second mask 906.

[0095] The second mask 906 only allows light in a specific area to pass through, can selectively reduce the intensity of local light, thereby forming a specific pattern and curing the printing material.

[0096] The arrangement of the light-emitting components and the splicing of the collimating lenses in the collimating component in this application will be introduced below with reference to FIG. 10.

[0097] The arrangement of multiple light-emitting components 1001 can be matrix, honeycomb, or spiral, or can be randomly arranged. The shape of each collimating lens in the collimating component can be geometric shapes such as square, circular, and regular hexagon. The array pattern of each lens in the compound eye array is the same as the array pattern of each collimating lens in the collimating component. Refer to ​, multiple light-emitting components 1001 are arranged in a square array, the collimating lens 1011 is rectangular, and the light-emitting center of the light-emitting component 1001 coincides with the center of the collimating lens 1011.

[0098] Refer to ​ , multiple light-emitting components 1001 are arranged in a square array, the collimating lens 1021 is circular, multiple circular collimating lenses 1021 are arranged in a square array, and the light-emitting center of the light-emitting component 1001 is located at the center of the circular collimating lens 1021.

[0099] Refer to ​ and ​ , multiple light-emitting components 1001 are arranged in a staggered pattern of multiple rows and multiple columns. Refer to ​ , the collimating lens includes a square lens 1041 and an octagonal lens 1031, and the square lens 1041 is located in the gap formed after the octagonal lenses 1031 are spliced. Refer to ​ , the collimating lens is a circular lens, larger circular lenses 1051 are arranged in a square array, and smaller circular lenses 1061 are embedded in the splicing gaps of the circular lenses 1051. Refer to ​ , multiple regular hexagonal collimating lenses 1071 are spliced. Refer to ​ , multiple circular collimating lenses 1081 are randomly arranged, and the light-emitting center of the light-emitting component 1001 is coaxially arranged with the center of the collimating lens 1081.

[0100] Refer to ​ , the optical system includes a light-emitting component 1101, a light-shielding element 1107, a collimating component 1102, and a fly-eye array 1103. The light-shielding element 1107 (such as a grille) is arranged between the light-emitting component 1101 and the collimating component 1102. The light-shielding element 1107 includes multiple channels, and the multiple channels are arranged in one-to-one correspondence with the multiple light-emitting components 1101, so that each channel allows only the light emitted by the corresponding light-emitting component 1101 to pass through. The light passing through the channels sequentially passes through the collimating component 1102 and the fly-eye array 1103 and irradiates on the target plane 1104 to form an illumination area. The light intensity in the overlapping area among the multiple light-emitting components 1101 is 80% to 120% of the light intensity in the non-overlapping area.

[0101] The central axis of the channel is coaxial with the central axis of the light-emitting component 1101. Each light-emitting component 1101 uses the light-shielding element 1107 to ensure the expected light projection shape. For example, multiple regular hexagonal channels are provided in the light-shielding element 1107, and the light emitted by the light-emitting component 1101 forms a regular hexagonal light projection area after passing through the channels. In addition, the channels can also be geometric shapes such as triangles, rectangles, regular octagons, and regular decagons.

[0102] The optical system provided by the embodiment of the present application can reduce the interference between the light from a single light-emitting component 1101 and the light from an adjacent light-emitting component 1101 by arranging a light-shielding element 1107 between the light-emitting component 1101 and the collimation interval.

[0103] Each light-emitting component 1101 includes at least one LED. The optical system further includes a dead pixel detection device for detecting whether the LED is damaged. The controller controls each light-emitting component 1101 according to the detection information of the dead pixel detection device. In one embodiment, if the dead pixel detection device detects that the LED is damaged, the controller controls the exposure area on the LCD screen to move, and replaces the damaged light-emitting component 1101 by lighting the undamaged light-emitting component 1101. In another embodiment, if the dead pixel detection device detects that the LED is damaged, the controller controls a plurality of light-emitting components 1101 to move so that the light-emitting components 1101 corresponding to the exposure area on the LCD screen are all undamaged light-emitting components 1101. In yet another embodiment, if the dead pixel detection device detects that the LED is damaged, the controller controls the light-emitting component 1101 adjacent to the damaged LED to increase the light intensity.

[0104] In another embodiment of the present application, the light-emitting component includes a plurality of LEDs, and the light rays emitted by the plurality of LEDs in the same light-emitting component have the same wavelength band. By arranging two, three or more LEDs in each light-emitting component, when one of the LEDs is damaged, it is ensured that the light-emitting component can still be used normally, and the light intensity of the display area corresponding to the light-emitting component is basically zero after a single LED is damaged.

[0105] In another embodiment of the present application, the light-emitting component includes a first LED and a second LED, the first LED is used for light rays of a first wavelength band, the second LED is used for emitting light rays of a second wavelength band, and the first wavelength band is different from the second wavelength band.

[0106] Taking the light-emitting component emitting ultraviolet light as an example, ultraviolet light includes long-wave ultraviolet (UVA), medium-wave ultraviolet (UVB) and short-wave ultraviolet (UVC). The wavelength range of UVA is 315nm - 400nm, the wavelength range of UVB is 280nm - 315nm, and the wavelength range of UVC is 100nm - 280nm. The first LED and the second LED emit ultraviolet light of different wavelength bands. For example, the central wavelength of the light emitted by the first LED is 385nm, which belongs to long-wave ultraviolet; the central wavelength of the light emitted by the second LED is 205nm, which belongs to short-wave ultraviolet, and the two are combined to achieve mixed light and improve the printing effect.

[0107] For the optical system provided by the present application, the light-emitting component includes a first LED and a second LED, and the light rays emitted by the first LED and the second LED have different wavelength bands, which can adapt to the printing requirements of multiple wavelength bands and print more efficiently and accurately.

[0108] Referring to FIG. 12, an optical module provided by the present application is introduced. This optical module is used to implement the functions of the above optical system. Referring to FIG. 12, it includes a mounting plate 1201, a collimating lens array 1203, a grating or light-shielding element 1202, and a controller. The light-shielding element 1202 is located between the mounting plate 1201 and the collimating lens array 1203. The mounting plate 1201 includes a plurality of light-emitting components, and each light-emitting component can emit light. The light-shielding element 1202 has a plurality of channels, and the plurality of channels are arranged in one-to-one correspondence with the plurality of light-emitting components. A plurality of collimating components 1102 in the collimating lens array 1203 are arranged in one-to-one correspondence with the plurality of light-emitting components, and the controller is electrically connected to the plurality of light-emitting components and can independently control the on / off of each light-emitting component.

[0109] The light emitted by the light-emitting component is collimated by the collimating lens array 1203 after passing through the channel. The central axis of the light-emitting component is coaxial with the central axis of the channel. Part of the light emitted by the light-emitting component is projected onto the collimating lens array 1203 from the channel, and other light is blocked, making the boundary of the light source projected onto the collimating lens array 1203 clearer. Moreover, by setting the light-shielding element 1202, the area of the light spot projected onto the collimating lens array 1203 can be adjusted, so that the area of the overlapping region between adjacent two light spots is controllable, which helps to adjust the light intensity of the overlapping region. Optionally, the cross-section of the channel is rectangular, and the light-emitting center of the light-emitting component is located at the center of the rectangle. With the help of the channel, a rectangular light-emitting surface can be obtained. Alternatively, referring to ​ , a plurality of channels 1301 are provided on the light-shielding element 1302. The cross-section of the channel 1301 is a regular hexagon, and the light-emitting center of the light-emitting component is located at the center of the regular hexagon. With the help of the channel 1301, a regular hexagon light-emitting surface can be obtained. In addition, the cross-section of the channel can also be triangular, regular octagon, etc. In this regard, the embodiments of the present application do not make specific limitations.

[0110] For the optical module provided by this embodiment, a light-shielding element 1202 is arranged between the mounting plate 1201 and the collimating lens array 1203. The collimating lens array 1203 is supported by the light-shielding element 1202, and crosstalk between the light-emitting components is prevented by a plurality of channels arranged in one-to-one correspondence with the plurality of light-emitting components, making the boundary of the light source clearer and the area of the overlapping region of the light spots passing through the collimating components controllable, which helps to improve the exposure quality.

[0111] Referring to ​ 、 12B, 12C and 12D, the compound eye lens array 1204 is arranged on the side of the collimating lens array 1203 away from the shading element 1202. The heat sink 1205 is arranged on the side of the light-emitting component away from the collimating lens array 1203, and is used to cool the light-emitting component. Specifically, the heat sink 1205 includes a plate body and heat dissipation fins arranged on one side of the plate body. The side of the plate body away from the heat dissipation fins is fitted with the mounting plate 1201. A heat dissipation gap is formed between adjacent heat dissipation fins, and the contact area between the heat sink 1205 and the air is increased by providing the heat dissipation fins, thereby improving the heat dissipation efficiency. Optionally, the plate body and the heat dissipation fins are an integrated structure and are made of a material with good thermal conductivity to accelerate the discharge of heat and avoid heat accumulation affecting the service life of the optical component.

[0112] See ​ , an adapter board 1206 is installed beside the mounting board 1201, and the adapter board 1206 is electrically connected to the mounting board 1201 to provide power to each light emitting component. The adapter board 1206 is provided with a circuit. ​ 、 12B 12C, adapter plate 1206 is parallel to the stacking direction of mounting plate 1201, shading element 1202, collimating lens array 1203, and fly-eye lens array 1204, and is positioned next to mounting plate 1201. Adapter plate 1206 is connected to an external power supply to power each light-emitting component. A controller is electrically connected to adapter plate 1206 and controls each light-emitting component via circuitry configured on adapter plate 1206.

[0113] ​ A photocurable 3D printing device according to some embodiments is shown. The photocurable 3D printing device (or additive manufacturing system) includes a drive assembly 1410 and a build platform 1420. The build platform 1420 solidifies layers one by one to form a printed object. The drive assembly 1410 is capable of driving the build platform 1420 in a vertical direction based on instructions from a controller (not shown). The photocurable 3D printing device also includes a carrier 1430, which is in the form of, for example, a trough, box, container, or plate, capable of carrying or supporting photosensitive materials of varying viscosities. When the carrier 1430 is, for example, a container, the carrier 1430 includes a resilient and at least partially transparent film 1432. When the build platform 1420 moves toward the film and remains at a predetermined position, light is applied to cure the photosensitive material to form a current cured layer, which adheres to both the build platform 1420 and the film 1432. To continue forming the next cured layer, the build platform 1420 and the current cured layer adhered thereto are moved away from the film 1432 to release the adhesion between the current cured layer and the film. After the build platform 1420 (and the current solidified layer) is peeled off from the film 1432, the build platform 1420 moves closer to the film to prepare for forming the next solidified layer. The light-curing 3D printing device also includes an optical system for providing uniform optical radiation to a predetermined area of the film.​ The illustrated optical system includes an LCD screen 1440 and an optical module 1450. The optical module 1450 is, for example, the optical module described above, which can independently control the opening and closing of each light-emitting component and can also adjust the light intensity of each light-emitting component (for example, by adjusting the drive current or PWM). The LCD screen 1440 is configured to selectively allow light to pass through. Alternatively, the optical system of some light-curing 3D printing devices includes a DMD component.

[0114] ​ A light-curing 3D printing device according to still other embodiments is shown. The light-curing 3D printing device (or additive manufacturing system) includes a drive component 1510 and a forming platform 1520. Solid layers are cured layer by layer on the forming platform 1520 to form a printed object, and the drive component 1510 can drive the forming platform 1520 to move in the vertical direction based on an instruction from a controller (not shown). The light-curing 3D printing device further includes a loading device 1530, which is in the form of, for example, a tank, a box, or a container and can hold or carry photosensitive materials with different viscosities. The loading device 1530 contains a liquid material, and the forming platform 1520 is immersed in the liquid material. When the forming platform 1520 moves close to the liquid surface 1532 of the liquid material and stays at a predetermined position, light is provided to cure the photosensitive material to form the current cured layer, and the current cured layer adheres to the forming platform 1520. To continue forming the next cured layer, the forming platform 1520 moves away from the liquid surface 1532. Thereafter, wait for the liquid surface to level naturally or use a squeegee (not shown) to level the liquid surface 1532, thereby ensuring a flat surface for the next cured layer. The light-curing 3D printing device further includes an optical system for providing uniform optical radiation in a predetermined area of the film. ​ The illustrated optical system includes an LCD screen 1540 and an optical module 1550. The optical module 1550 is, for example, the optical module described above, which can independently control the opening and closing of each light-emitting component and can also adjust the light intensity of each light-emitting component (for example, by adjusting the drive current or PWM). The LCD screen 1540 is configured to selectively allow light to pass through. Alternatively, the optical system of some light-curing 3D printing devices includes a DMD component.

[0115] This application also provides a light-curing 3D printing device, including a material tray and an optical system, wherein the optical system is the optical system of any of the above-described embodiments. The material tray is used to hold the printing material. The light emitted by the optical system cures the printing material.

[0116] The printing material is a photosensitive resin material. The light-curing 3D printing device includes the optical system, the material tray, and the forming platform as described above. Among them, the optical system may include the optical module as described above. The forming platform is connected to a lifting mechanism, and under the action of the lifting mechanism, the forming platform can move closer to or away from the material tray.

[0117] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. An optical system for a light-curing 3D printing device, characterized in that: Comprising: A plurality of light-emitting components, each of the light-emitting components being configured to emit light for curing a printing material; A plurality of collimating components, the light emitted by each of the light-emitting components passing through a single collimating component and illuminating a target plane to form an illumination area; A controller, the controller being capable of independently controlling each of the light-emitting components; Wherein, the plurality of light-emitting components include: A first light-emitting component; and A second light-emitting component adjacent to the first light-emitting component along a predetermined direction, Wherein the illumination area of the first light-emitting component and the illumination area of the second light-emitting component at least partially overlap and have an overlapping area, and the total light intensity of the overlapping area is 80% - 120% of the light intensity of the non-overlapping area of the illumination area of the first light-emitting component or the second light-emitting component.

2. The optical system according to claim 1, characterized in that: The illumination areas of the first light-emitting component and the second light-emitting component have an intermediate area and an edge area, and the overlapping area is at least partially in the edge area of the illumination areas of the first light-emitting component and the second light-emitting component.

3. The optical system according to claim 1, wherein: The total light intensity of the overlapping area is 90% - 100% of the light intensity of the non-overlapping area of the illumination area of the first light-emitting component or the second light-emitting component, preferably 92% - 98%, more preferably 95% - 97%.

4. The optical system according to claim 1, characterized in that: The optical system further includes a diffuser; the diffuser is disposed on a side of the collimating component away from the light-emitting component, and the diffuser is configured to diffuse the light passing through the collimating component.

5. The optical system according to claim 4, characterized in that: The distance between the central axis of the first light-emitting component and the central axis of the second light-emitting component is d. After the light emitted by each of the light-emitting components passes through the corresponding collimating component and is adjusted by the diffuser, a light spot with a diameter of D is formed on the target plane, wherein D = 2 * d * n, and n is a positive integer.

6. The optical system according to claim 5, wherein: When n = 1, along the predetermined direction, the length of the overlapping area is half of the length of the illumination area of the first light-emitting component or the second light-emitting component; or When n = 2, along the predetermined direction, the length of the overlapping area is three-quarters of the length of the illumination area of the first light-emitting component or the second light-emitting component.

7. The optical system according to claim 1, wherein: The plurality of light-emitting components further include: a third light-emitting component adjacent to the second light-emitting component along the predetermined direction, wherein the illumination area of the second light-emitting component and the illumination area of the third light-emitting component at least partially overlap and have a second overlapping area, and the total light intensity of the second overlapping area is 80% - 120% of the light intensity of the non-overlapping area of the illumination area of the third light-emitting component.

8. The optical system according to claim 1, wherein: The collimating angle of the collimating component is -10° to 10°, preferably -5° to 5°, more preferably -2° to 2°.

9. The optical system according to claim 1, characterized in that: The optical system further includes a first mask, the first mask being located between the collimating component and the target plane, the first mask including a frosted area and a transparent area, the transparent area being correspondingly disposed with the non-overlapping area, and the frosted area being correspondingly disposed with the overlapping area.

10. The optical system according to claim 1, characterized in that: The optical system further includes a second mask, the second mask being arranged on a side of the collimating component away from the light-emitting component, and the first mask is configured to selectively reduce the light emitted by the plurality of light-emitting components.

11. The optical system according to claim 10, wherein: The second mask includes an LCD screen.

12. The optical system according to claim 1, characterized in that: The multiple light-emitting component arrays are arranged in rows, arranged staggeredly, or embedded.

13. The optical system according to claim 1, characterized in that: The optical system further includes a light-shielding element located between the light-emitting component and the collimating component; the light-shielding element includes a plurality of channels, and a single channel is aligned with a single light-emitting component and a single collimating component.

14. The optical system according to claim 13, characterized in that: The cross-section of the channel is any one of a triangle, a rectangle, a regular hexagon, a regular octagon, or a regular decagon.

15. The optical system according to claim 1, characterized in that: Each light-emitting component includes: a single LED; or a plurality of LEDs that emit light in the same wavelength band.

16. The optical system according to claim 1, wherein: A single light-emitting component includes a first LED and a second LED, the first LED is configured to emit light in a first wavelength band, the second LED is configured to emit light in a second wavelength band, and the first wavelength band is different from the second wavelength band.

17. A light-curing 3D printing device, characterized in that: Comprising: a forming platform configured to adhere at least one cured layer; a loading device configured to load printing material; a driving component configured to drive the forming platform to move closer to or away from the loading device; and The optical system according to any one of claims 1 to 16, wherein the light emitted by the optical system is configured to cure the printing material to form the cured layer.

18. The light-curing 3D printing device according to claim 17, wherein: It further includes a dead pixel detection device configured to detect whether the LEDs in the light-emitting components are damaged.

19. A method for operating a light-curing 3D printing device as described in claim 17, characterized in that: Comprising: Using the first plurality of light-emitting components of the optical system to emit light and project light onto the printing material in the loading device to form a first cured layer having a first profile; Then Using the second plurality of light-emitting components of the optical system to emit light and project light onto the printing material in the loading device to form a second cured layer having a second profile, wherein the first plurality of light-emitting components is different from the second plurality of light-emitting components.

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