Photocuring three-dimensional printing device
By stacking and laying exposure screens with different resolutions in the light-curing three-dimensional printing device, filtering large angle matte light and improving the bright and dark contrast of the exposure screen, the resin residue problem caused by insufficient contrast of the exposure screen is solved and the printing accuracy is improved.
Patent Information
- Application Number
- CN202422095980.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-27
- Publication Date
- 2025-07-01
- Estimated Expiration
- 2034-08-27
AI Technical Summary
The contrast of the exposure screen of existing light-curing three-dimensional printers is limited, resulting in high dark area energy and a lot of resin residues, which affects printing accuracy.
The first exposure screen and the second exposure screen are arranged layered, and the resolution of the first exposure screen is less than or equal to the resolution of the second exposure screen. Most of the large-angle mist light is filtered through the first exposure screen, and the small-angle light passes through the second exposure screen for exposure and curing.
Effectively reduce the dark area energy in the exposure molding area, reduce resin residue, and improve the molding accuracy of the printing model.
Smart Images
Figure CN223045182U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of three-dimensional printing equipment, 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 an optical system with constant radiation energy. It needs to uniformly irradiate the entire screen under the exposure screen, and then control the area to be exposed through the screen to complete the curing and printing of the model.
[0003] Due to the limited contrast of the exposure screen, it is difficult to achieve high energy both above and below the screen, resulting in higher energy in the dark area, more resin residues, and thus 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 contrast of the exposure screen, reduce the energy in the dark area, thereby reducing the resin residues caused by excessive energy in the dark area, and further improving the printing accuracy.
[0005] To achieve the above object, 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 light source assembly, a first exposure screen, and a second exposure screen;
[0008] The first exposure screen and the second exposure screen are arranged in a stacked manner and are disposed on the light-emitting side of the light source assembly, wherein the first exposure screen is located between the second exposure screen and the light source assembly, or the second exposure screen is located between the first exposure screen and the light source assembly;
[0009] The resolution of the first exposure screen is less than or equal to the resolution of the second exposure screen.
[0010] Optionally, the number of the first exposure screens is one or more;
[0011] If the resolution of the first exposure screen is less than the resolution of the second exposure screen, the size of the pixel points of the first exposure screen adjacent to the light source assembly is larger than the size of the pixel points of the second exposure screen;
[0012] If the resolution of the first exposure screen is less than the resolution of the second exposure screen and the number of the first exposure screens is multiple, the resolutions of the multiple first exposure screens are equal or the resolutions of the multiple first exposure screens increase one by one along the light-emitting direction of the light source assembly;
[0013] Optionally, if the resolution of the first exposure screen is less than that of the second exposure screen, the size of the pixel points of the first exposure screen adjacent to the light source assembly is greater than or equal to twice the size of the pixel points of the second exposure screen.
[0014] Optionally, the screen size of the first exposure screen is equal to that of the second exposure screen; or
[0015] The ratio range of the screen size of the first exposure screen to that of the second exposure screen is between 0.8 and 1.2.
[0016] Optionally, along the light-emitting direction of the light source assembly, the projection of the display pattern of the first exposure screen on the second exposure screen covers at least the projection range of the display pattern of the second exposure screen.
[0017] Optionally, the first exposure screen and the second exposure screen are used to expose the exposure images corresponding to the same slice layer pattern at corresponding resolutions.
[0018] Optionally, the distance between the first exposure screen and the second exposure screen is greater than or equal to 0 and less than or equal to 10 mm;
[0019] The distance between the first exposure screen and the second exposure screen is the distance of the gap between the first exposure screen and the second exposure screen; or the distance between the first exposure screen and the second exposure screen is the distance between the center point of the first exposure screen and the center point of the second exposure screen.
[0020] Optionally, the light-curing three-dimensional printing device further includes:
[0021] A base, a receiving cavity is provided inside the base, an installation groove is provided on the surface of the base, and a through hole communicating with the receiving cavity is provided at the bottom of the installation groove;
[0022] The light source assembly is disposed in the receiving cavity, and the light-emitting side of the light source assembly faces the through hole;
[0023] The first exposure screen and the second exposure screen are disposed in the installation groove.
[0024] Optionally, if the first exposure screen is located between the second exposure screen and the light source assembly, the upper surface of the second exposure screen is flush with the upper surface of the base; if the second exposure screen is located between the first exposure screen and the light source assembly, the upper surface of the first exposure screen is flush with the upper surface of the base.
[0025] Optionally, the light-curing three-dimensional printing device further includes:
[0026] The material tank is arranged on the base, and a release film is provided on the bottom of the material tank. The release film is disposed opposite to the light-emitting surfaces of the first exposure screen and the second exposure screen.
[0027] Optionally, an adhesive layer is provided between the first exposure screen and the second exposure screen;
[0028] Or,
[0029] A support member is provided in the installation groove, and the support member is used to support the second exposure screen.
[0030] Optionally, the first exposure screen is located between the second exposure screen and the light source assembly. If a support member is provided in the installation groove, the support member includes a convex edge extending outward from the groove side wall of the installation groove;
[0031] The first exposure screen is disposed at the bottom of the convex edge, and the second exposure screen is disposed on the top of the convex edge and supported on the convex edge.
[0032] Optionally, the light source assembly includes a light-emitting body, the diameter of the light-emitting body is any value from 1 mm to 20 mm, and the light-emitting angle of the light-emitting body is any value from 60° to 120°.
[0033] By means of the above technical solution, the present utility model has at least the following beneficial effects:
[0034] In the light-curing three-dimensional printing device provided by the embodiment of the present utility model, the first exposure screen and the second exposure screen are arranged in a stacked manner and disposed on the light-emitting side of the light source assembly. Moreover, the resolution of the first exposure screen is less than or equal to the resolution of the second exposure screen. The first exposure screen is located between the second exposure screen and the light source assembly, or the second exposure screen is located between the first exposure screen and the light source assembly, so that the light emitted by the light source assembly can reach the curing and forming area of the light-curing three-dimensional printing device after passing through the first exposure screen and the second exposure screen. The first exposure screen, which is the first optical exposure screen, can filter out most of the large-angle stray light, and the small-angle light then passes through the subsequent exposure screen for exposure and curing and forming, thereby achieving a relatively high bright-dark contrast of the overall exposure screen, effectively reducing the dark area energy in the exposure and forming area, further reducing resin residues, and improving the forming accuracy of the printed model. BRIEF DESCRIPTION OF THE DRAWINGS
[0035] Figure 1 FIG. 30 is a schematic structural diagram of a first exposure screen, a second exposure screen and a light source assembly in a first viewing angle of a light-curing three-dimensional printing device provided by an embodiment of the present utility model;
[0036] Figure 2 FIG. 34 is a schematic structural diagram of a first exposure screen, a second exposure screen and a light source assembly in a second viewing angle of a light-curing three-dimensional printing device provided by an embodiment of the present utility model;
[0037] Figure 3 The structural schematic diagram of a stereolithography 3D printing device provided by an embodiment of the present utility model;
[0038] Figure 4 is Figure 3 the enlarged schematic diagram of part A in
[0039] Explanation of the reference numerals:
[0040] 1 - Light source assembly; 2 - First exposure screen; 3 - Second exposure screen; 4 - Base; 41 - Accommodating cavity; 42 - Installation groove; 5 - Material tank. Specific embodiments
[0041] To make the objectives, technical solutions and advantages of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be described in more detail below with reference to the accompanying drawings in the preferred embodiments of the present utility model.
[0042] As Figure 1 and Figure 2 shown, an embodiment of the present utility model provides a stereolithography 3D printing device, including a light source assembly 1, a first exposure screen 2 and a second exposure screen 3; the first exposure screen 2 and the second exposure screen 3 are arranged in a stacked manner and are disposed on the light-emitting side of the light source assembly 1, wherein the first exposure screen 2 is located between the second exposure screen 3 and the light source assembly 1, or the second exposure screen 3 is located between the first exposure screen 2 and the light source assembly 1. The resolution of the first exposure screen 2 is less than or equal to the resolution of the second exposure screen 3.
[0043] Wherein, the light source assembly 1 may include lamp beads, a lens bracket and a lens disposed on the lens bracket. Moreover, the structural form of the light source assembly 1 may be various. For example, the light source assembly 1 may include a matrix light source, a COB glass lens and a Fresnel lens light source or a COB glass lens and a curved mirror light source, etc.
[0044] The light-emitting port of the light source assembly 1 may be opposite to the material tank. In one embodiment, the light emitted by the light source assembly 1 may cure the resin in the material tank to realize the exposure curing of the model.
[0045] Wherein, both the first exposure screen 2 and the second exposure screen 3 may be black and white screens, which respectively include an upper panel, a lower panel, and liquid crystal and polarizers disposed between the upper panel and the lower panel.
[0046] It should be noted that both the first exposure screen 2 and the second exposure screen 3 can be black-and-white screens. Specifically, in implementation, the first exposure screen 2 and the second exposure screen 3 can be stacked and assembled together. Of course, for the convenience of assembly and cost reduction, the first exposure screen 2 and the second exposure screen 3 can be an integrated screen assembly. Specifically, if the number of the first exposure screens 2 is one, the screen assembly can include an upper panel, a lower panel, two liquid crystals, and two polarizers disposed between the upper panel and the lower panel. That is to say, the first exposure screen 2 and the second exposure screen 3 can share the upper and lower panels, while the liquid crystals and polarizers are used independently.
[0047] In the light-curing three-dimensional printing device provided by the embodiment of the present invention, the first exposure screen 2 and the second exposure screen 3 are stacked and disposed on the light-emitting side of the light source assembly 1. Moreover, the resolution of the first exposure screen 2 is less than or equal to the resolution of the second exposure screen 3. The first exposure screen 2 is located between the second exposure screen 3 and the light source assembly 1, or the second exposure screen 3 is located between the first exposure screen 2 and the light source assembly 1, so that the light emitted by the light source assembly 1 can reach the curing and forming area of the light-curing three-dimensional printing device after passing through the first exposure screen 2 and the second exposure screen 3. The first of the first exposure screen 2 and the second exposure screen 3, i.e., the optical exposure screen, can filter out most of the large-angle stray light, and the small-angle light then passes through the subsequent exposure screen for exposure and curing and forming, thereby achieving a relatively high bright-dark contrast of the overall exposure screen, effectively reducing the energy in the dark area of the exposure forming area, further reducing the resin residue, and improving the forming accuracy of the printed model.
[0048] In the following embodiments, the case where the first exposure screen 2 is located between the second exposure screen 3 and the light source assembly 1 is mainly used as an example for explanation, and those skilled in the art can know that the embodiment where the second exposure screen 3 is located between the first exposure screen 2 and the light source assembly 1 corresponds to it.
[0049] In some embodiments, the resolution of the first exposure screen 2 is less than the resolution of the second exposure screen 3, and the first exposure screen 2 is located between the second exposure screen 3 and the light source assembly 1, so that the light emitted by the light source assembly 1 can first pass through the first exposure screen 2 with a lower resolution, and then pass through the second exposure screen 3 with a higher resolution, so that the first exposure screen 2 can filter out most of the large-angle stray light. In this way, the light transmitted from the first exposure screen 2 is already small-angle light with most of the large-angle stray light removed. The small-angle light then passes through the second exposure screen 3 with a higher resolution for exposure, thereby achieving a relatively high contrast of the overall exposure screen, effectively reducing the dark area energy, further reducing the resin residue, and improving the printing accuracy.
[0050] In some embodiments, the resolution of the first exposure screen 2 is equal to that of the second exposure screen 3. Then, the resolutions of both the first exposure screen 2 and the second exposure screen 3 can be relatively high. And if the screen size of the first exposure screen 2 is equal to that of the second exposure screen 3, that is, the pixel size of the first exposure screen 2 is equal to that of the second exposure screen 3, and the pixel positions of the first exposure screen 2 and the second exposure screen 3 are set to have a one-to-one correspondence, it enables a clearer demarcation line between the model edge curing area and the dark area outside the model, can further improve the contrast between the dark area energy and the bright area energy, and the first exposure screen 2 can filter out more large-angle stray light, making the light passing through the second exposure screen 3 all parallel as much as possible, thereby achieving a relatively high contrast for the overall exposure screen, further effectively reducing the dark area energy, reducing resin residues, and improving the printing accuracy.
[0051] In some embodiments, the resolution of the first exposure screen 2 is less than that of the second exposure screen 3. The first exposure screen 2 can also filter out large-angle stray light. Since the resolution of the first exposure screen 2 is less than that of the second exposure screen 3, the size of the pixel points of the first exposure screen 2 is larger than that of the pixel points of the second exposure screen 3. Therefore, when installing the first exposure screen 2 and the second exposure screen 3, the pixels of the first exposure screen 2 and the second exposure screen 3 can be misaligned, and it can also ensure that light can pass through the second exposure screen 2. And the larger size of the pixel points of the first exposure screen 2 makes the light transmittance of the pixel points of the first exposure screen 2 better, so that the overall light passing through the first exposure screen and the second exposure screen can have a better transmittance, and can generally improve the light energy utilization efficiency.
[0052] In some embodiments, the number of the first exposure screens 2 can be one or more; if the resolution of the first exposure screen 2 is less than that of the second exposure screen 3, then the size of the pixel points of the first exposure screen 2 adjacent to the light source assembly 1 is larger than that of the pixel points of the second exposure screen 3. Thus, it can better achieve that the first exposure screen 2 filters out most of the large-angle stray light, so that the light passing through the second exposure screen 3 with a higher resolution is almost small-angle light, and then achieve a relatively high contrast for the overall exposure screen, effectively reducing the dark area energy, reducing resin residues, and improving the printing accuracy.
[0053] In some embodiments, if the resolution of the first exposure screen 2 is less than that of the second exposure screen 3 and the number of the first exposure screens 2 is multiple, the resolutions of the multiple first exposure screens 2 can be equal; or the resolutions of the multiple first exposure screens 2 gradually increase along the light-emitting direction of the light source assembly 1. That is to say, the resolution of the first exposure screen 2 adjacent to the light source assembly 1 is the smallest. It can be understood that if the number of the first exposure screens 2 is multiple, the multiple first exposure screens 2 are arranged in a stacked manner, and the multiple first exposure screens 2 are located between the second exposure screen 3 and the light source assembly 1.
[0054] Thus, after the light emitted by the light source assembly 1 passes through each first exposure screen 2 in sequence, the large-angle stray light in the light emitted by the light source assembly 1 can be filtered one by one through each first exposure screen 2, so that more large-angle stray light can be filtered out. Furthermore, the light transmitted through the first exposure screen 2 is almost small-angle light without large-angle stray light, so that the light entering the second exposure screen 3 is almost all small-angle light, thereby further improving the overall contrast of the exposure screen, further reducing the dark area energy, and further improving the printing accuracy. Among them, the resolution of the multiple first exposure screens 2 increases one by one along the light-emitting direction of the light source assembly 1, and the amount of large-angle stray light filtered by each first exposure screen 2 can be increased one by one.
[0055] It can be understood that when the number of the first exposure screens 2 is multiple, in order to ensure the light transmittance, it is necessary to increase the power of the light source assembly 1, which will increase the cost. Specifically, in implementation, the number of the first exposure screens 2 can be selected according to actual needs.
[0056] In some embodiments, the size of the pixel points of the first exposure screen 2 adjacent to the light source assembly 1 is greater than or equal to 2 times the size of the pixel points of the second exposure screen 3, so as to better improve the filtering effect of the first exposure screen 2 on the stray light in the light emitted by the light source assembly 1, and further improve the overall contrast of the exposure screen.
[0057] Among them, the size of the pixel points of the first exposure screen 2 adjacent to the light source assembly 1 can be greater than or equal to 2 times the size of the pixel points of the second exposure screen 3. For example, the size of the pixel points of the first exposure screen 2 adjacent to the light source assembly 1 can be 2 times, 3 times, 4 times or 5 times the size of the pixel points of the second exposure screen 3. In this way, high-precision printing can be achieved with a lower resolution of the first exposure screen 2 while ensuring the printing accuracy, so as to obtain the effect of achieving higher-precision printing at a lower cost.
[0058] In some embodiments, the screen size of the first exposure screen 2 can be equal to that of the second exposure screen 3; or, the ratio range of the screen size of the first exposure screen 2 to the screen size of the second exposure screen 3 can be between 0.8 and 1.2. In this way, while maximizing the use of screen resources and reducing the machine area, the light intensity contrast of the light emitted after passing through the first exposure screen and the second exposure screen can be better.
[0059] In some embodiments, along the light-emitting direction of the light source assembly 1, the projection of the display pattern of the first exposure screen 2 on the second exposure screen 3 covers at least the projection range of the display pattern of the second exposure screen 3.
[0060] Among them, the display patterns of the first exposure screen 2 and the second exposure screen 3 can be the same or different. As long as, along the light-emitting direction of the light source assembly 1, the projection of the display pattern of the first exposure screen 2 on the second exposure screen 3 can cover the display pattern of the second exposure screen 3, the first exposure screen 2 can filter out the light in the non-display area, that is, filter out the light in the area that does not need to be exposed, so that the light entering the second exposure screen 3 through the first exposure screen 2 is basically small-angle light and the light in the display area, thereby further improving the overall contrast of the exposure screen, further reducing the energy in the dark area, and further improving the printing accuracy.
[0061] In some embodiments, the first exposure screen 2 and the second exposure screen 3 can be used to expose the exposure images corresponding to the resolution of the same slice layer pattern.
[0062] To avoid waste of light energy, as long as it is ensured that all the display patterns of the second exposure screen 3 have light passing through for exposure curing. In some embodiments, the display patterns of the first exposure screen 2 and the second exposure screen 3 can be the same.
[0063] In some embodiments, the distance between the first exposure screen 2 and the second exposure screen 3 is greater than or equal to 0 and less than or equal to 10 mm. Among them, the distance between the first exposure screen 2 and the second exposure screen 3 can be the distance of the gap between the first exposure screen 2 and the second exposure screen 3; or the distance between the first exposure screen 2 and the second exposure screen 3 can be the distance between the center point of the first exposure screen 2 and the center point of the second exposure screen 3.
[0064] Thus, it is possible to avoid too large a distance between the first exposure screen 2 and the second exposure screen 3, thereby increasing the transmittance of the light emitted from the first exposure screen 2 through the second exposure screen 3, further improving the overall contrast of the exposure screen, further reducing the energy in the dark area, and further improving the printing accuracy.
[0065] If the number of the first exposure screens 2 is multiple, the distance between two adjacent first exposure screens 2 can also be greater than or equal to 0 and less than or equal to 10 mm, so as to ensure the transmittance of the light emitted from the previous first exposure screen 2 through the next first exposure screen 2, further improving the overall contrast of the exposure screen, further reducing the energy in the dark area, and further improving the printing accuracy.
[0066] In some embodiments, refer to Figure 3 and Figure 4, the stereolithography three-dimensional printing device may further include a base 4. A receiving cavity 41 is provided inside the base 4, and an installation groove 42 is provided on the surface of the base 4. A through hole communicating with the receiving cavity 41 is opened at the bottom of the installation groove 42; the light source assembly 1 is disposed in the receiving cavity 41, and the light-emitting side of the light source assembly 1 faces the through hole; the first exposure screen 2 and the second exposure screen 3 are disposed in the installation groove 42.
[0067] In some embodiments, referring to Figure 3 and Figure 4 , the stereolithography three-dimensional printing device may further include a material tank 5. The material tank 5 is disposed on the base 4, and a release film is provided at the bottom of the material tank 5. The release film is disposed opposite to the light-emitting surfaces of the first exposure screen 2 and the second exposure screen 3. Taking the example that the first exposure screen 2 is located between the second exposure screen 3 and the light source assembly 1, the release film is disposed opposite to the second exposure screen 3.
[0068] When the stereolithography three-dimensional printing device is started, the light emitted by the light source assembly 1 first passes through the first exposure screen 2 with a lower resolution. After the large-angle light and the light in the non-display area are filtered out by the first exposure screen 2, it then passes through the second exposure screen 3 with a higher resolution, and finally projects into the material tank 5 to expose and cure the resin in the material tank 5. In this process, a higher contrast of the overall exposure screen is achieved, thereby effectively reducing the energy in the dark area, further reducing the resin residue, and improving the printing accuracy.
[0069] In some embodiments, if the first exposure screen 2 is located between the second exposure screen 3 and the light source assembly 1, the upper surface of the second exposure screen 3 is flush with the upper surface of the base 4; if the second exposure screen 3 is located between the first exposure screen 2 and the light source assembly 1, the upper surface of the first exposure screen 2 is flush with the upper surface of the base 4.
[0070] Taking the example that the first exposure screen 2 is located between the second exposure screen 3 and the light source assembly 1 for illustration, if the upper surface of the second exposure screen 3 protrudes from the upper surface of the base 4, after the material tank 5 is disposed on the base 4, the second exposure screen 3 will abut against the release film of the material tank 5, thereby affecting the normal printing of the model. At the same time, it will also wear the release film and shorten the service life of the release film. In this embodiment, the upper surface of the second exposure screen 3 is flush with the upper surface of the base 4, avoiding the second exposure screen 3 from abutting against the release film, thereby ensuring the normal printing of the model and not wearing the release film, and extending the service life of the release film.
[0071] In some embodiments, a bonding layer may be provided between the first exposure screen 2 and the second exposure screen 3. That is, the first exposure screen 2 and the second exposure screen 3 are bonded and assembled together through the bonding layer. Among them, the bonding layer may be provided in a complete circumferential circle around the outer edges of the first exposure screen 2 and the second exposure screen 3; or, the bonding layer may be provided in multiple circumferential segments around the outer edges of the first exposure screen 2 and the second exposure screen 3; or, the bonding layer may be provided to cover the entire surfaces of the first exposure screen 2 and the second exposure screen 3.
[0072] Specifically, there can be various types of bonding layers. For example, double-sided tape or an adhesive layer, etc.
[0073] Or, in some other embodiments, a support member may be provided in the mounting groove 42, and this support member is used to support the second exposure screen 3.
[0074] Specifically, if a support member is provided in the mounting groove 42, the support member may include a convex edge extending outward from the groove sidewall of the mounting groove 42; the first exposure screen 2 is located between the second exposure screen 3 and the light source assembly 1, the first exposure screen 2 is disposed at the bottom of the convex edge, and the second exposure screen 3 is disposed at the top of the convex edge and supported on the convex edge, thereby realizing the stacked arrangement of the first exposure screen 2 and the second exposure screen 3, and moreover, the first exposure screen 2 is located between the second exposure screen 3 and the light source assembly 1.
[0075] In some embodiments, the light source assembly 1 may include a light-emitting body, the diameter of the light-emitting body may be any value from 1 mm to 20 mm, and the light-emitting angle of the light-emitting body may be any value from 60° to 120°.
[0076] Among them, by setting the diameter of the light-emitting body of the light source assembly 1 to any value from 1 mm to 20 mm, and at the same time setting the light-emitting angle of the light-emitting body to any value from 60° to 120°, it can be ensured that the light emitted by the light source assembly 1 can uniformly pass through the first exposure screen 2 and the second exposure screen 3 in sequence with a smaller diffusion angle, so as to improve the uniformity and collimation of the light received by the exposure screen, improve the printing accuracy and printing effect of the model, and ensure that the light energy has a high use efficiency, reduce light loss, and save the use cost. Specifically, the diameter of the light source can be 1 mm, 3 mm, 5 mm, 8 mm, 11 mm, 20 mm or other sizes, and the light-emitting angle of the light source can be 60°, 100°, 110°, 120° or other angles.
[0077] Embodiment 1. A stereolithography 3D printing device, comprising:
[0078] A light source assembly 1, a first exposure screen 2, and a second exposure screen 3;
[0079] The first exposure screen 2 and the second exposure screen 3 are arranged in a stacked manner and are disposed on the light-emitting side of the light source assembly 1. Among them, the first exposure screen 2 is located between the second exposure screen 3 and the light source assembly 1, or the second exposure screen 3 is located between the first exposure screen 2 and the light source assembly 1;
[0080] The resolution of the first exposure screen 2 is less than or equal to the resolution of the second exposure screen 3.
[0081] Example 2. The light-curing three-dimensional printing device according to Example 1,
[0082] The number of the first exposure screens 2 is one or more;
[0083] If the resolution of the first exposure screen 2 is less than the resolution of the second exposure screen 3, the size of the pixel points of the first exposure screen 2 adjacent to the light source assembly 1 is larger than the size of the pixel points of the second exposure screen 3;
[0084] If the resolution of the first exposure screen 2 is less than the resolution of the second exposure screen 3 and the number of the first exposure screens 2 is multiple, the resolutions of the multiple first exposure screens 2 are equal or the resolutions of the multiple first exposure screens 2 increase one by one along the light-emitting direction of the light source assembly 1.
[0085] Example 3. The light-curing three-dimensional printing device according to Example 2. If the resolution of the first exposure screen 2 is less than the resolution of the second exposure screen 3, the size of the pixel points of the first exposure screen 2 adjacent to the light source assembly 1 is greater than or equal to 2 times the size of the pixel points of the second exposure screen 3.
[0086] Example 4. The light-curing three-dimensional printing device according to Example 1,
[0087] The screen size of the first exposure screen 2 is equal to the screen of the second exposure screen 3; or
[0088] The ratio range of the screen size of the first exposure screen 2 and the screen size of the second exposure screen 3 is between 0.8 and 1.2.
[0089] Example 5. The light-curing three-dimensional printing device according to Example 1,
[0090] Along the light-emitting direction of the light source assembly 1, the projection of the display pattern of the first exposure screen 2 on the second exposure screen 3 covers at least the projection range of the display pattern of the second exposure screen 3.
[0091] Example 6. The light-curing three-dimensional printing device according to Example 1,
[0092] The first exposure screen 2 and the second exposure screen 3 are used to expose the exposure images corresponding to the resolution of the same slice layer pattern.
[0093] Example 7. The light-curing three-dimensional printing device according to Example 1,
[0094] The distance between the first exposure screen 2 and the second exposure screen 3 is greater than or equal to 0 and less than or equal to 10 mm;
[0095] The distance between the first exposure screen 2 and the second exposure screen 3 is the distance of the gap between the first exposure screen 2 and the second exposure screen 3; or the distance between the first exposure screen 2 and the second exposure screen 3 is the distance between the center point of the first exposure screen 2 and the center point of the second exposure screen 3.
[0096] Example 8. The stereolithography three-dimensional printing device according to Example 1 further includes:
[0097] A base 4, in which a receiving cavity 41 is provided, and an installation groove 42 is provided on the surface of the base 4. A through hole communicating with the receiving cavity 41 is opened at the bottom of the installation groove 42;
[0098] The light source assembly 1 is disposed in the receiving cavity 41, and the light-emitting side of the light source assembly 1 faces the through hole;
[0099] The first exposure screen 2 and the second exposure screen 3 are disposed in the installation groove 42.
[0100] Example 9. The stereolithography three-dimensional printing device according to Example 8
[0101] If the first exposure screen 2 is located between the second exposure screen 3 and the light source assembly 1, the upper surface of the second exposure screen 3 is flush with the upper surface of the base 4;
[0102] If the second exposure screen 3 is located between the first exposure screen 2 and the light source assembly 1, the upper surface of the first exposure screen 2 is flush with the upper surface of the base 4.
[0103] Example 10. The stereolithography three-dimensional printing device according to Example 8 further includes:
[0104] A material tank 5 is disposed on the base 4. A release film is disposed at the bottom of the material tank 5, and the release film is disposed opposite to the light-emitting surfaces of the first exposure screen 2 and the second exposure screen 3.
[0105] Example 11. The stereolithography three-dimensional printing device according to Example 8
[0106] An adhesive layer is provided between the first exposure screen 2 and the second exposure screen 3;
[0107] Or,
[0108] A support member is disposed in the installation groove 42 for supporting the second exposure screen 3.
[0109] Example 12. In the stereolithography three-dimensional printing device according to Example 11, the first exposure screen 2 is located between the second exposure screen 3 and the light source assembly 1,
[0110] If a support member is provided in the installation groove 42, the support member includes a convex edge extending outward based on the groove side wall of the installation groove 42;
[0111] The first exposure screen 2 is arranged at the bottom of the convex edge, and the second exposure screen 3 is arranged at the top of the convex edge and supported on the convex edge.
[0112] Example 13. The light-curing three-dimensional printing device according to Example 1,
[0113] The light source assembly 1 includes a light-emitting body, the diameter of the light-emitting body is any value from 1 mm to 20 mm, and the light-emitting angle of the light-emitting body is any value from 60° to 120°.
[0114] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than 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; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims
1. A light-curing three-dimensional printing device, characterized in that: include: A light source assembly, a first exposure screen and a second exposure screen; The first exposure screen and the second exposure screen are stacked and arranged on the light-emitting side of the light source assembly, wherein the first exposure screen is located between the second exposure screen and the light source assembly, or the second exposure screen is located between the first exposure screen and the light source assembly; The resolution of the first exposure screen is less than or equal to the resolution of the second exposure screen.
2. The light-curing 3D printing device according to claim 1, characterized in that: The number of the first exposure screens is one or more; If the resolution of the first exposure screen is smaller than the resolution of the second exposure screen, the size of the pixel of the first exposure screen adjacent to the light source assembly is larger than the size of the pixel of the second exposure screen; If the resolution of the first exposure screen is smaller than that of the second exposure screen, and there are multiple first exposure screens, the resolutions of the multiple first exposure screens are equal or the resolutions of the multiple first exposure screens increase one by one along the light emitting direction of the light source assembly.
3. The light-curing 3D printing device according to claim 2, characterized in that: If the resolution of the first exposure screen is smaller than that of the second exposure screen, the size of the pixel points of the first exposure screen adjacent to the light source assembly is greater than or equal to twice the size of the pixel points of the second exposure screen.
4. The light-curing 3D printing device according to claim 1, characterized in that: The screen size of the first exposure screen is equal to the screen size of the second exposure screen; or The ratio of the screen size of the first exposure screen to the screen size of the second exposure screen is in the range of 0.8-1.
2.
5. The light-curing 3D printing device according to claim 1, characterized in that: Along the light emitting direction of the light source assembly, the projection of the display pattern of the first exposure screen on the second exposure screen covers the display pattern of the second exposure screen at least in the projection range.
6. The light-curing 3D printing device according to claim 1, characterized in that: The first exposure screen and the second exposure screen are used to expose exposure images of corresponding resolutions of the same slice layer pattern.
7. The light-curing 3D printing device according to claim 1, characterized in that: The distance between the first exposure screen and the second exposure screen is greater than or equal to 0 and less than or equal to 10 mm; The distance between the first exposure screen and the second exposure screen is the distance of the gap between the first exposure screen and the second exposure screen; Or the distance between the first exposure screen and the second exposure screen is the distance between the center point of the first exposure screen and the center point of the second exposure screen.
8. The light-curing 3D printing device according to claim 1, characterized in that: Also includes: A base, wherein a receiving cavity is arranged in the base, a mounting groove is arranged on the surface of the base, and a through hole communicating with the receiving cavity is arranged at the bottom of the mounting groove; The light source assembly is disposed in the accommodating cavity, and the light emitting side of the light source assembly faces the through hole; The first exposure screen and the second exposure screen are arranged in the installation groove.
9. The light-curing 3D printing device according to claim 8, characterized in that: If the first exposure screen is located between the second exposure screen and the light source assembly, the upper surface of the second exposure screen is flush with the upper surface of the base; If the second exposure screen is located between the first exposure screen and the light source assembly, the upper surface of the first exposure screen is flush with the upper surface of the base.
10. The light-curing 3D printing device according to claim 8, characterized in that: Also includes: A material trough is arranged on the base, a release film is arranged at the bottom of the material trough, and the release film is arranged opposite to the light emitting surfaces of the first exposure screen and the second exposure screen.
11. The light-curing 3D printing device according to claim 8, characterized in that: An adhesive layer is provided between the first exposure screen and the second exposure screen; or, A supporting member is arranged in the mounting groove, and the supporting member is used to support the second exposure screen.
12. The light-curing 3D printing device according to claim 11, characterized in that: The first exposure screen is located between the second exposure screen and the light source assembly. If a support member is provided in the installation groove, the support member comprises a convex edge extending outwardly based on the groove side wall of the installation groove; The first exposure screen is arranged at the bottom of the convex edge, and the second exposure screen is arranged at the top of the convex edge and supported on the convex edge.
13. The light-curing 3D printing device according to claim 1, characterized in that: The light source assembly includes a light-emitting body, the diameter of the light-emitting body is any value between 1 mm and 20 mm, and the light-emitting angle of the light-emitting body is any value between 60° and 120°.