CN116811235A - Projection type photo-curing 3D printing system - Google Patents

Projection type photo-curing 3D printing system Download PDF

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Publication number
CN116811235A
CN116811235A CN202211272136.9A CN202211272136A CN116811235A CN 116811235 A CN116811235 A CN 116811235A CN 202211272136 A CN202211272136 A CN 202211272136A CN 116811235 A CN116811235 A CN 116811235A
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CN
China
Prior art keywords
printing
light source
collimating lens
light
curing
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Pending
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CN202211272136.9A
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Chinese (zh)
Inventor
贺永
高岩
孙元
喻康
刘国峰
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Zhejiang University ZJU
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Zhejiang University ZJU
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Priority to CN202211272136.9A priority Critical patent/CN116811235A/en
Publication of CN116811235A publication Critical patent/CN116811235A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
    • B29C64/10—Processes of additive manufacturing
    • B29C64/106—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material
    • B29C64/124—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material using layers of liquid which are selectively solidified
    • B29C64/129—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material using layers of liquid which are selectively solidified characterised by the energy source therefor, e.g. by global irradiation combined with a mask
    • B29C64/135—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material using layers of liquid which are selectively solidified characterised by the energy source therefor, e.g. by global irradiation combined with a mask the energy source being concentrated, e.g. scanning lasers or focused light sources
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
    • B29C64/20—Apparatus for additive manufacturing; Details thereof or accessories therefor
    • B29C64/264—Arrangements for irradiation
    • B29C64/277—Arrangements for irradiation using multiple radiation means, e.g. micromirrors or multiple light-emitting diodes [LED]
    • B29C64/282—Arrangements for irradiation using multiple radiation means, e.g. micromirrors or multiple light-emitting diodes [LED] of the same type, e.g. using different energy levels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
    • B29C64/30—Auxiliary operations or equipment
    • B29C64/386—Data acquisition or data processing for additive manufacturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
    • B29C64/30—Auxiliary operations or equipment
    • B29C64/386—Data acquisition or data processing for additive manufacturing
    • B29C64/393—Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y10/00—Processes of additive manufacturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y30/00—Apparatus for additive manufacturing; Details thereof or accessories therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y50/00—Data acquisition or data processing for additive manufacturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y50/00—Data acquisition or data processing for additive manufacturing
    • B33Y50/02—Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/005—Projectors using an electronic spatial light modulator but not peculiar thereto
    • G03B21/008—Projectors using an electronic spatial light modulator but not peculiar thereto using micromirror devices
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/142—Adjusting of projection optics
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2006—Lamp housings characterised by the light source
    • G03B21/2013—Plural light sources

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Manufacturing & Machinery (AREA)
  • Optics & Photonics (AREA)
  • Mechanical Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Microelectronics & Electronic Packaging (AREA)

Abstract

The invention provides a projection type photocuring 3D printing system, which is provided with a light source array and a collimating lens group to construct a plurality of groups of quasi-parallel light with different deflection angles as incident light of a DMD chip, so that a macroscopic resolution structure and a sub-resolution structure can be constructed simultaneously, the printing width is larger, the printing precision is higher, and the manufacturing efficiency of a high-resolution structure is effectively improved; the sub-resolution structure size can be adjusted under the condition of certain other conditions, and the printing precision under the same printing breadth is improved. Meanwhile, the printing system of the invention enables the lower-precision optical machine to have a high-precision printing effect to a certain extent, and effectively reduces the equipment cost. In addition, the printing system provided by the invention can be suitable for printing of various materials, including photo-curing resin, photosensitive resin or photo-curing hydrogel, and has a relatively wide application prospect.

Description

Projection type photo-curing 3D printing system
Technical Field
The invention belongs to the technical field of additive manufacturing, and particularly relates to a projection type photo-curing 3D printing system.
Background
3D printing, also known as additive manufacturing or rapid prototyping, is characterized by constructing two-dimensional layer structures of specific shape, and stacking them layer by layer, and finally forming a three-dimensional entity. The 3D printing process which is typical at present is as follows: fused deposition modeling, selective laser sintering modeling, stereoscopic light curing 3D printing, digital light processing DLP printing (projection type 3D printing) technology, direct metal laser sintering modeling technology, layered entity manufacturing technology, polymer injection technology, adhesive injection 3D printing, electron beam melting manufacturing and the like.
The digital light processing DLP printing technology is to project a cross-section pattern of a preprinted 3D model by using a high-resolution digital light processor DLP projector, so that the liquid photopolymer is solidified, and photo-solidification is carried out layer by layer, compared with the same type of three-dimensional photo-solidification 3D printing technology, the molding precision is high, the material property, the detail and the surface smoothness of the plastic part can be compared with the injection molding durable plastic part, and the digital light processing DLP technology is more and more attractive by virtue of excellent precision and relatively high efficiency, so that the plastic part can be seen by application in the fields of industry, medical treatment and the like.
The digital light processing DLP printing device generally comprises a computer control component, a DLP projector, a trough and a printing platform; the computer control assembly controls the work of the whole device, is not only responsible for slicing a model to be printed and forming a section pattern to be transmitted to the DLP projector, but also controls the height of the printing platform relative to the trough and the stripping of the printing platform from the trough, so as to realize layer-by-layer printing; the DMD chip in the DLP projector is provided with a plurality of micro-vibrating mirrors, the DMD chip controls the opening and closing states of all the micro-vibrating mirrors according to the sectional view of the model to be printed, which is transmitted by the computer control component, the micro-vibrating mirrors in the opening state can reflect light from the light source, the micro-vibrating mirrors in the closing state can not reflect light from the light source, and under the combination, the DMD chip can form an exposure image corresponding to the sectional image of the model; and the projection objective projects the exposure pattern to the trough and the printing platform for photo-curing printing.
However, due to the fact that the size of the micro-vibrating mirror and the number of the micro-vibrating mirrors (the number of pixels) of the same core component DMD chip in the DLP projector are fixed, even if the objective lenses with different multiplying powers are used, the pixel size is larger when a larger printing breadth is ensured, and the printing precision is reduced; when ensuring higher printing precision, the pixel size is smaller and the printing width is reduced. Therefore, the digital light processing DLP printing device in the prior art cannot solve the problem that the printing width and the printing precision catch each other in the printing process.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a dual-resolution projection type photocuring 3D printing system, which is based on a digital light processing DLP printing technology, utilizes the micro-galvanometer size of a DMD chip in a DLP projector to determine a macroscopic resolution structure (macroscopic structure) for printing, and simultaneously realizes the printing of the macroscopic resolution structure and the construction of a sub-resolution structure (microscopic structure) by setting the aberration of a light source array control projection objective lens, thereby carrying out dual-resolution printing. The printing system breaks through the limitation of hardware, makes the size higher than the precision of the optical machine, and ensures that printing with higher precision is realized on the premise of having a larger printing breadth.
The projection type photo-curing 3D printing system comprises a light source module;
the light source module comprises a light source array and a collimating lens group arranged between the light source array and the DMD chip;
the center of the light source array and the optical axis of the collimating lens group are positioned on the same straight line;
the collimating lens group receives the light emitted by the light source array and forms a plurality of groups of quasi-parallel light with different deflection angles to irradiate the DMD chip.
The dual-resolution projection type photo-curing 3D printing system improves the light source module on the basis of a traditional printing device, realizes simultaneous printing of a macroscopic resolution structure and a microscopic resolution structure, enables the size of a sub-resolution structure to be adjustable, and improves printing precision on the premise of a certain printing breadth.
Besides the light source module, the dual-resolution projection type photo-curing 3D printing system further comprises a bottom plate, a projection device, a trough, a printing platform and a computer control assembly. Wherein, light source module, projection arrangement, silo, print platform all install on the bottom plate. The silo is used for loading light curing material, and print platform is used for forming and bearing the printing and accomplishing the object, and projection arrangement, silo and print platform set gradually from bottom to top. The computer control assembly is used for controlling the whole equipment to run.
Preferably, the bottom of the trough is made of a high light-transmitting material, and the high light-projecting material can be one or a combination of a plurality of high-transmitting glass, FEP, PET, PDMS and acrylic.
Preferably, the light source array is composed of real light sources arranged in an array.
Preferably, the light source array is a virtual light source array constructed by a microlens array after a real light source emits light.
Wherein the real light source is used for generating light required by photo-curing printing; the micro lens array is used for receiving light generated by the real light source and forming a plurality of virtual light sources arranged in an array.
The real light source can be an active light-emitting unit such as an LED lamp bead and a laser; the emission band of the real light source can be blue light of 400-450nm or ultraviolet light of 200-400 nm.
The arrangement of the micro-lens array can be in the forms of square, rectangle, parallelogram, circle and the like, and the arrangement form is adapted to the shape of the microstructure to be constructed; likewise, the shapes of the individual microlenses in the microlens array can also be square, rectangular and the like, so as to meet the closely-spaced requirement.
When the parallelism of the light emitted from the real light source is not good, it is further preferable that an optical element for collimating the optical path is provided between the real light source and the microlens array. The arrangement of the optical element can ensure the parallelism of light entering the micro lens array, so that the micro lens array can form a virtual light source with higher quality, and the accuracy of the sub-resolution structure is improved. The optical element for collimating the optical path may be a lens group, or may be another optical element such as a fresnel lens.
Preferably, the collimating lens group includes a plano-convex lens as a first collimating lens and a biconvex lens as a second collimating lens, and the optical axes of the plano-convex lens and the biconvex lens are positioned on the same straight line;
the first collimating lens is arranged close to the light source module, and the convex surface of the first collimating lens faces the light source module; the second collimating lens is arranged between the first collimating lens and the DMD chip.
In the technical scheme, the first collimating lens is used for receiving and collimating the light emitted from the light source array; the second collimating lens is used for receiving and further collimating the light emitted from the first collimating lens to form a plurality of groups of quasi-parallel light with different deflection angles, and the quasi-parallel light irradiates the DMD chip.
Further, the first collimating lens and the second collimating lens may each independently take various forms such as a common spherical mirror, an aspherical mirror, or a fresnel lens.
As a further preferable aspect, the surfaces of the first collimating lens and the second collimating lens are provided with a plating film, so as to improve and reduce the light energy loss.
The projection device of the dual-resolution projection type photo-curing 3D printing system comprises a DMD chip, a chip driver and a projection objective; the DMD chip and its chip driver are connected with computer control component. The chip driver can receive section picture data of a model from the computer control assembly (obtained by slicing the model to be printed by the computer control assembly) and convert the section picture data into corresponding driving signals, and the DMD chip receives the driving signals and controls the opening and closing states of all micro-vibrating mirrors on the DMD chip; wherein, the on state means that the micro-vibrating mirror can reflect the light from the collimating lens group received by the DMD chip, and the off state means that the micro-vibrating mirror can not reflect the light from the collimating lens group, thereby forming an exposure pattern corresponding to the section picture; the projection objective is used for projecting the exposure pattern formed by the DMD chip onto a printing plane (the printing plane is the upper surface of the material to be cured for current printing).
The pixel points of the exposure pattern are images formed on the printing plane by the micro-galvanometers on the DMD chip through the projection objective. Because the light irradiated onto the DMD chip is a plurality of groups of quasi-parallel light with different deflection angles generated by the light source module, the image formed by the single micro-vibrating mirror on the actual DMD chip is a bright spot with the shape scaled in equal proportion and a plurality of slightly dark bright spots (aberration) which are formed by surrounding the bright spot in a manner of translating, the translation distance of the slightly dark bright spots (aberration) is determined by the deflection angle of the quasi-parallel light irradiated onto the DMD chip, the combination of the slightly dark bright spots and the bright spots enables the image formed by the single micro-vibrating mirror to have a more complex controllable appearance instead of the original simple shape (the original shape is a square), and the complex shape is projected onto a photo-curing material to form the image, so that a macroscopic resolution structure and a sub-resolution structure can be constructed simultaneously.
The multiplying power selection of the projection objective is not unique, and can be adjusted according to the actual structural size and the requirements of printing breadth so as to meet the requirements of various application occasions.
As a further preferred option, a TIR prism is arranged between the projection objective and the DMD chip to accommodate the flip angle of the micro-mirrors on the DMD chip in the on-off state. Meanwhile, the light energy reflected by the DMD chip can be ensured to be smoothly incident into the projection objective and not to be projected to other positions or returned in the original path.
As a further preference, the arrangement of the microlenses on the microlens array is adapted to the arrangement of the micro-mirrors on the DMD chip to increase the sensitivity to sub-resolution structure adjustment and to achieve a greater range of sub-resolution structure adjustment. The micro lenses are generally arranged along a vertical plane, and the micro vibrating mirrors on the DMD chip are arranged along a plane inclined by 45 degrees with the arrangement plane of the micro lenses. Of course, the arrangement of the two can be properly adjusted according to actual needs.
Preferably, the dual-resolution projection type photo-curing 3D printing system further comprises an optical machine moving device for adjusting the distance between the collimating lens groups and the position of the light source array, wherein the collimating lens groups and the light source array are respectively arranged on the optical machine moving device, and the optical machine moving device is arranged on the bottom plate.
The equivalent focal length of the collimating lens group can be changed by adjusting the distance between the collimating lens groups, so that the size of the sub-resolution structure size is affected. When the distance between the collimating lens groups is reduced, the equivalent focal length is increased, so that the deflection angle of quasi-parallel light irradiated on the DMD chip is increased, and the sub-resolution structure size is further increased; when the distance between the collimating lens groups is increased, the equivalent focal length is reduced, so that the deflection angle of quasi-parallel light irradiated on the DMD chip is reduced, and the sub-resolution size structure is reduced. Under the condition that other conditions are the same, the adjustment of the sub-resolution structure size can be realized by adjusting the equivalent focal length of the collimating lens group, and then the printing precision can be adjusted according to the requirement.
As a further preferred option, the opto-mechanical movement means comprise three independently movable shaft movement means, denoted A, B and C-axis movement means, respectively. Each shaft is provided with a corresponding fixture (second collimating lens holder, first collimating lens holder, light source array holder) for mounting the second collimating lens, first collimating lens and light source array, respectively. The three axis movement devices respectively move to drive corresponding structures on the three axis movement devices to move so as to adjust the relative positions of the light source array, the first collimating lens and the second collimating lens, thereby adjusting the equivalent focal length generated by the collimating lens group formed by the first collimating lens and the second collimating lens, ensuring the relative positions of the light source array and the front focal plane of the collimating lens group formed by the first collimating lens and the rear focal plane of the collimating lens group formed by the projection device and the second collimating lens, and further adjusting the deflection angle of quasi-parallel light irradiated on the DMD chip. The three shaft movement devices capable of independently moving can be linear modules or other driving devices such as linear motors.
As a further preferred option, limit switches are respectively arranged on the three independently movable shaft movement devices and are respectively used for ensuring that the light source array, the first collimating lens and the second collimating lens have more accurate positions, so that the parallelism of the emergent light of the second collimating lens and the uniformity of the light irradiated on the DMD chip are ensured, and the precision of the sub-resolution structure and the uniformity of the optical axis of the printing breadth are ensured; meanwhile, the equipment is convenient for operators to return to zero, and the equipment is convenient to use and remove faults.
Preferably, the light source array is respectively provided with a temperature sensor, a light intensity meter and a cooling fan.
The temperature sensor and the light intensity meter can be used for measuring the working temperature and the light intensity of the light source array in real time, and the computer control component can be used for adjusting the working temperature and the light intensity according to the measurement result, so that the stability of the illumination intensity and the safety of the system operation in the printing process are ensured. The heat radiation fan is used for controlling the temperature of the light source array.
In addition, a printing movement device is arranged on the bottom plate. The printing motion device comprises a Z-axis motion device and a Y-axis motion device, an extension part perpendicular to the moving direction of the Z-axis motion device is arranged on the Z-axis motion device, one end of the extension part is connected with the Z-axis motion device, and a printing platform is arranged on the other end of the extension part; the Z-axis movement device is used for adjusting the height of the printing platform, so that the height of the cured product is changed, the cured part is lifted, and the layer-by-layer printing of the product is completed by layer superposition of the cured materials. The upper end of the Y-axis movement device is provided with a trough, one end of the trough is connected with the upper end of the Y-axis movement device, the opposite end of the trough is arranged on the bottom plate through a supporting rod, and the other end of the trough is connected with the supporting rod in a variable angle manner, so that the condition that the Y-axis movement device drives the other end of the trough to move up and down, and the inclination angle of the trough is changed, and the solidified product is stripped from the trough.
The Z-axis movement device can be a linear module or other driving devices such as a linear motor. The Y-axis movement device can be a linear module, a linear motor, a penetrating motor and other driving devices.
The computer control component is respectively connected with the printing motion device, the optical machine motion device and the light source module and is used for controlling the movement of corresponding components and adjusting the light intensity of the light source array.
Specifically, the computer control assembly comprises an upper computer, an optical machine control component and a printing motion control component. The upper computer is used for man-machine interaction, generating cross-section pictures with preset intervals along the printing direction of the pre-printing 3D model and printing control instructions, and coordinating the work of all the components. The optical machine control component is used for calculating the relative positions of the light source module, the first collimating lens and the second collimating lens and the light intensity of the light source array in the light source module according to the set parameters of the sub-resolution structure size (microstructure size), and controlling the optical machine movement device to drive the light source module, the first collimating lens and the second collimating lens to move to the set positions and simultaneously controlling the light source array to reach the set light intensity. In addition, the optical machine control component is also used for transmitting the section picture of the model generated by the upper computer to the chip driver, and the chip driver controls the DMD chip to form an exposure pattern corresponding to the section picture. The printing motion control component is used for controlling the printing motion device to realize lifting of the printing platform and stripping and recovery of the printing platform and the trough.
The upper computer can be a personal computer with IO devices such as a display, a keyboard and a mouse, can be a raspberry pie with a display screen, and can also be an industrial personal computer or other devices carrying special IO devices. The upper computer is provided with software, and the software is particularly responsible for various tasks of the upper computer. The software has a double-port communication function and can simultaneously perform bidirectional communication with the optical machine control component and the printing motion control component. The software can read in the STL format file of the pre-printed 3D model and display the STL format file in a three-dimensional environment, and simultaneously provides model control functions including rotation, scaling, translation and the like, so that an operator can conveniently adjust relevant parameters of the pre-printed 3D model. The software can generate cross-section pictures with certain intervals of the pre-printed 3D model along the printing direction, the outline of the pre-printed 3D model at different positions along the printing direction is obtained according to triangle vertex information in the STL file, the filling starting point of the inside and outside directions of the pre-printed 3D model and the inside of the model is obtained according to triangle normal vector information in the STL file, four-communication detection is carried out according to the filling starting point of the inside of the model, filling of the inside of the model is completed, and finally the pictures are output according to the filling information. The software can generate a printing control instruction, and based on the related information such as the layer height, the exposure time and the like given by an operator, a whole set of printing control instruction can be automatically generated according to grammar and stored in the memory of the upper computer. The software can monitor the current working condition of the printer, reflect the currently printed layer height and the currently projected exposure pattern, and facilitate operators to know the current working progress.
The optical machine control component can be a single chip microcomputer or other equipment, is internally provided with software, supports bidirectional communication with the upper computer and the DMD chip controller at the same time, is provided with a printing control instruction interpreter, interprets printing control instructions, drives corresponding ports and executes corresponding commands. Besides, a fitting formula between the relative positions of the light source module, the first collimating lens and the second collimating lens and the light intensity of the light source in the light source module and the sub-resolution microstructure size parameter, which are obtained by a theoretical formula, simulation and experimental data, is provided for calculating the positions of the three and the light intensity of the light source array.
The printing motion control component can be a singlechip or a PLC or other equipment, is internally provided with software, supports two-way communication with the upper computer, is provided with a printing control instruction interpreter, interprets printing control instructions and drives corresponding ports (a Z-axis motion device and a Y-axis motion device) to execute corresponding commands.
The dual-resolution projection type photo-curing 3D printing system can be suitable for printing of various materials, including photo-curing resin, photosensitive resin, photo-curing hydrogel and the like.
The printing steps by the dual-resolution projection type photo-curing 3D printing system comprise:
s1, slicing the 3D model to be printed according to a set printing layer height by the upper computer to obtain model section pictures which are arranged in sequence;
s2, driving an optical machine movement device to control the light source array, the first collimating lens and the second collimating lens to move to corresponding positions by the optical machine control component according to the set microstructure size, and controlling the light source array to output set light intensity; simultaneously, the optical machine control component sequentially transmits the section pictures to the projection device, and the projection device generates corresponding exposure patterns according to the currently received section pictures and projects the exposure patterns to the printing platform;
s3, after the exposure pattern to be generated exposes the printing platform for a set time, generating a curing material with a corresponding thickness on a printing plane (working surface of the printing platform) to finish printing of the current layer;
s4, the printing motion control part drives the printing motion device to control the height of the printing platform to rise, and then the trough is controlled to be stripped from the printed material; the trough is restored to an initial state after stripping, the printing platform is lowered to a distance with the bottom of the trough to be one printing layer high, and the next layer printing is prepared;
s5, repeating the steps S2 to S4 until the printing of the whole model is completed.
In the step S2, the light source array emits light, and the projection device is irradiated with a plurality of groups of quasi-parallel light beams having different deflection angles formed after passing through the collimating lens group consisting of the first collimating lens and the second collimating lens. The number of groups of quasi-parallel light is the same as the number of light sources in the array of light sources.
Compared with the prior art, the invention has the beneficial effects that:
the projection type photo-curing 3D printing system utilizes the unavoidable aberration of the adjusting projection objective lens, sets the light source array and the collimating lens group to construct a plurality of groups of quasi-parallel light with different deflection angles as incident light of the DMD chip, can construct two resolution structures of macroscopic resolution and sub-resolution at the same time, ensures higher printing precision while having larger printing breadth, and effectively improves the manufacturing efficiency of the high-resolution structure; the sub-resolution structure size can be adjusted under the condition of certain other conditions, and the printing precision under the same printing breadth is improved. Meanwhile, the printing system of the invention enables the lower-precision optical machine to have a high-precision printing effect to a certain extent, and effectively reduces the equipment cost. In addition, the printing system provided by the invention can be suitable for printing of various materials, including photo-curing resin, photosensitive resin or photo-curing hydrogel, and has a relatively wide application prospect.
Drawings
Fig. 1 is a schematic structural diagram of a projection type photo-curing 3D printing system according to an embodiment of the present invention;
in the figure: 1-a bottom plate; 2-a support rod; 3-an optical board; 4-a bracket; 5-standing seats; 6-a light source; 7-a microlens array; 8-a first collimating lens; 9-a DMD chip; 10-projection objective; 11-mounting rack; 12-a second collimating lens; 13-A axis movement means; a 14-B axis motion device; 15-C axis movement device; 16-a light source array frame; 17-a first collimating lens holder; 18-a second collimating lens holder; 19-a trough; 20-a printing platform; 21-Z axis movement device; 22-Y axis movement device;
FIG. 2 is a schematic view of a projection result of a conventional projection system;
FIG. 3 is a schematic view of the projection results in the case that the incident light is a plurality of sets of quasi-parallel light with different deflection angles;
FIG. 4 is a schematic diagram of a dual resolution principle provided by an embodiment of the present invention;
FIG. 5 is a schematic diagram of adjusting the size of a sub-resolution structure according to an embodiment of the present invention;
FIG. 6 is a schematic diagram illustrating the formation of a dual resolution printing system optical path according to an embodiment of the present invention;
in fig. 7, (a) is a surface printed by a dual resolution projection type photo-curing 3D printing system according to an embodiment of the present invention; (b) drawing is a surface printed by a general printing system; it can be seen from the figure that the surface printed by the dual-resolution projection type photo-curing 3D printing system provided by the embodiment of the invention has longitudinal grooves, while the surface printed by the common printing system is disordered and has no obvious structural characteristics.
Detailed Description
In order to make the objects, features and advantages of the present invention more comprehensible, the following detailed description of the technical scheme of the present invention refers to the accompanying drawings. An embodiment of the invention is shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
As shown in fig. 1, the projection type photo-curing 3D printing system comprises a base plate 1, a light source module, a light machine movement device, a projection device, a trough 19, a printing platform 20, a printing movement device and a computer control component, wherein the light source module, the light machine movement device, the projection device, the trough 19, the printing platform 20 and the printing movement device are arranged on the base plate 1. In addition, the bottom plate 1 is further provided with an optical machine board 3, wherein the light source module, the optical machine movement device and the projection device are arranged on the optical machine board 3.
The light source module includes a light source 6, a microlens array 7, and a collimator lens group composed of a first collimator lens 8 and a second collimator lens 12. The light source 6 and the microlens array 7 together constitute a light source array. The light source 6, the micro lens array 7, the first collimating lens 8 and the second collimating lens 12 are sequentially arranged, and the center of the micro lens array 7 and the optical axes of the first collimating lens 8 and the second collimating lens 12 are positioned on the same horizontal line.
The light source 6 is used to generate light required for printing, and in this embodiment, LED beads are used, which emit blue light with a wavelength band of 400-450 nm. Compared with the same-power laser and the like, the LED lamp bead has lower cost, is provided with a temperature sensor and a light intensity meter, and performs closed-loop control on the temperature and the light intensity so as to realize the control on the heat dissipation of the light source 6 and the light intensity emitted by the light source 6 and ensure the stability of illumination intensity and the safety of system operation in the printing process. A cooling fan is arranged outside the light source 6 for controlling the temperature. The microlens array 7 is used for receiving the light generated by the light source 6 and forming a plurality of virtual light sources, and the specific light path forming process can be seen in fig. 6. The arrangement of the micro lens array adopts square arrangement, and meanwhile, each micro lens is square in shape, so that close arrangement is ensured. Since the light source 6 adopts LED beads, the light-emitting parallelism is poor, and an optical element (not shown in the figure) is arranged between the light source 6 and the microlens array 7, and is used for collimating the incident light of the microlens array 7, the optical element adopts a lens group form, and the surface of the optical element is coated with a film to reduce the light loss.
A first collimating lens 8 for receiving and collimating light exiting the microlens array 7; the second collimating lens 12 is configured to receive and further collimate the light emitted from the first collimating lens 8 to form a plurality of groups of quasi-parallel light beams with different deflection angles, and irradiate the projection device, and a specific optical path forming process can be seen in fig. 6, where the first collimating lens 8 uses a coated plano-convex lens, and the second collimating lens 12 uses a coated biconvex lens.
The optical machine moving device comprises an A-axis moving device 13, a B-axis moving device 14, a C-axis moving device 15, a light source module frame 16, a first collimating lens frame 17 and a second collimating lens frame 18, and the A-axis moving device 13, the B-axis moving device 14 and the C-axis moving device 15 are respectively arranged on the optical machine board 3. The light source arrays (the light source 6 and the microlens array 7) are mounted on the C-axis movement device 15 through the light source module frame 16; the first collimating lens 8 is mounted on the B-axis moving device 14 through a first collimating lens holder 17; the second collimator lens 12 is mounted to the a-axis moving device 13 through a second collimator lens holder 18. The a-axis moving device 13, the B-axis moving device 14 and the C-axis moving device 15 respectively and independently control the second collimating lens 12, the first collimating lens holder 17, the light source 6 and the micro lens array 7 to move along the arrangement direction of the second collimating lens 12, the first collimating lens holder 17 and the light source array (the light source 6 and the micro lens array 7), and adjust the relative positions of the two to adjust the equivalent focal length of the collimating lens group formed by the first collimating lens 8 and the second collimating lens 12, and ensure that the center point of the rear prism array of the micro lens array 7 and the DMD chip 9 in the projection device are respectively positioned at the front focal plane and the rear focal plane of the lens group formed by the first collimating lens 8 and the second collimating lens 12, thereby adjusting the deflection angle of the quasi-parallel light irradiated on the DMD chip 9. When the first collimating lens 8 and the second collimating lens 12 are close to each other, the equivalent focal length of the collimating lens group is increased, so that the deflection angle of quasi-parallel light irradiated on the DMD chip 9 is correspondingly increased, and the sub-resolution structure size is increased; when the first collimating lens 8 and the second collimating lens 12 are far away from each other, the equivalent focal length thereof will decrease, so that the deflection angle of the quasi-parallel light irradiated onto the DMD chip 9 will also decrease accordingly, and the sub-resolution structure size will decrease. The A-axis movement device 13, the B-axis movement device 14 and the C-axis movement device 15 are all screw-nut type linear modules.
The A-axis movement device 13, the B-axis movement device 14 and the C-axis movement device 15 are respectively provided with limit switches, and are used for ensuring that a light source array (a light source 6 and a micro lens array 7), a first collimating lens 8 and a second collimating lens 12 have more accurate positions, so that the parallelism of emergent light rays of the second collimating lens 12 and the uniformity of the light rays irradiated on the DMD chip 9 are ensured, and the precision of a sub-resolution structure and the uniformity of an optical axis of a printing breadth are ensured; meanwhile, the equipment is convenient for operators to return to zero, and the equipment is convenient to use and remove faults.
The projection device is arranged on the side of the light board 3 remote from the first collimating lens 8 by means of a mounting frame 11, which comprises a DMD chip 9, a chip driver (not shown in the figure) and a projection objective 10. The DMD chip 9, the projection objective 10, the trough 19 and the printing platform 20 are sequentially arranged from bottom to top.
The DMD chip 9 and the chip driver in the projection device are connected with the computer control component, wherein the chip driver can receive the section picture data of the model from the computer control component and convert the section picture data into corresponding driving signals to be sent to the DMD chip 9; the driving signal received by the DMD chip 9 and thereby controlling the on-off state of all the micro-mirrors on the DMD chip 9, wherein the on-state means that the micro-mirrors can reflect the light received by the DMD chip 9 from the second collimating lens 12, and the off-state means that the micro-mirrors cannot reflect the light received by the second collimating lens 12, thereby forming a corresponding exposure pattern; the projection objective 10 is used to project the exposure pattern formed by the DMD chip 9 onto a printing plane (the printing plane is the upper surface of the material to be cured for current printing, which is the working surface of the printing platform). The pixels of the exposure pattern are images of the DMD chip 9 formed by the micro-mirrors through the projection objective 10 on the printing plane, and since the light irradiated onto the DMD chip 9 is a plurality of groups of quasi-parallel light (as shown in fig. 6) with different deflection angles generated by the light source module, the image formed by the single micro-mirrors on the DMD chip 9 will be a bright spot with a shape scaled in equal proportion and a plurality of dark bright spots (aberration) generated by the surrounding translation of the bright spot, as shown in fig. 3.
In contrast, a single micro-mirror image obtained by a conventional projection printing system is an equally scaled bright spot (shown as an image) and a continuous ring around it (shown as an aberration), as shown in fig. 2. Similar to the translation distance of these slightly darker bright spots (aberrations) in fig. 3, which are determined by the magnitude of the quasi-parallel light deflection angle impinging on the DMD chip 9 (as shown in fig. 5), the combination of these slightly darker bright spots and bright spots will give the image formed by a single micro-mirror a more complex controllable appearance, rather than the original simple shape (the original shape is mostly square), when multiple micro-mirrors are imaged, the projected exposure pattern will have a more complex shape, which is projected onto the photo-curable material to shape it, so that a sub-resolution structure can be constructed, as shown in fig. 4.
The projection objective 10 employs an objective with a magnification of 10.
The micro-vibration mirror arrangement surface on the DMD chip 9 forms an angle of 45 degrees with the micro-lens arrangement surface on the micro-lens array 7, so that the sensitivity of the sub-resolution structure adjustment is improved while the sub-resolution structure size in each direction is ensured to be uniform, the adjustment of the sub-resolution structure size in a larger range is realized, and the requirement of high printing precision under different printing breadth requirements is met.
A TIR prism is arranged between the projection objective 10 and the DMD chip to adapt to the turning angle of the micro lens on the DMD chip in the on-off state.
The hopper 19 is used for loading a photo-curing material, and the photo-curing material can be photo-curing resin, photosensitive resin, photo-curing hydrogel or the like. The bottom of the trough 19 is made of high light transmission material, and can be one or a combination of a plurality of high light transmission glass, FEP, PET, PDMS and acrylic; a print platform 20 for forming and carrying a print object.
The printing movement device comprises a Z-axis movement device 21 and a Y-axis movement device 22, the moving end of the Z-axis movement device 21 is connected with an extension part perpendicular to the moving direction of the Z-axis movement device, and one end of the extension part far away from the Z-axis movement device 21 is provided with a printing platform 20; the Z-axis movement device 21 is used for adjusting the height of the printing platform 20 so as to change the height of the cured product, and lifting the cured part to realize the layer-by-layer superposition of the cured materials to finish the printing of the product; the Z-axis moving device 21 is mounted on the base plate 1 through the bracket 4. One end of a trough 19 is arranged at the upper end of the Y-axis movement device 22, the other end corresponding to the end of the trough 19 is arranged on the bottom plate 1 through a supporting rod 2, and the other end of the trough 19 is connected with the supporting rod 2 in a variable angle manner; the Y-axis movement device 22 is operative to drive the end of the chute 19 connected thereto to move up and down for changing the angle of inclination of the chute 19 so as to cause the cured product to be peeled from the chute 19. In this embodiment, the Z-axis moving device 21 is a ball screw nut type linear module, and the Y-axis moving device 22 is a through motor mounted on the base plate 1 through the stand 5.
The base plate 1 and the supporting structure of each part are used for building a structural frame for supporting and fixing the dual-resolution projection type photo-curing 3D printing system. Wherein, bottom plate 1 is the base of whole printing system, and backing bar 2, ray apparatus board 3, support 4 all install on bottom plate 1, and wherein backing bar 2 is used for the one end of fixed silo, and ray apparatus board 3 is used for installing ray apparatus motion device and mounting bracket 11, and support 4 is used for installing Z axle motion device, and upright 5 is used for installing Y axle motion device, and mounting bracket 11 is used for installing projection arrangement. The bottom plate 1, the support rod 2, the optical machine board 3, the bracket 4, the stand 5 and the mounting frame 11 jointly form a frame of the printing system.
The computer control assembly comprises an upper computer, an optical machine control component and a printing motion control component. The upper computer is used for man-machine interaction, generating cross-section pictures and control instructions of the 3D model to be printed with set intervals along the printing direction, and coordinating the work of all the components; the optical machine control component is used for calculating the relative positions of the light source array (the light source 6 and the micro lens array 7), the first collimating lens 8 and the second collimating lens 12 and the light intensity of the light source 6 according to the set micro structure size, and controlling the light source and the micro lens array, the first collimating lens 8 and the second collimating lens 12 to reach the set positions and the light source to reach the set light intensity. Besides, the optical machine control component is also used for transmitting the model section picture generated by the upper computer to the projection device to form a corresponding exposure pattern. The printing motion control part is used for controlling the printing motion device to realize lifting of the printing platform and stripping and recovery of the trough.
The upper computer is a personal computer with IO devices such as a display, a keyboard and a mouse, is popular, is convenient for system deployment, and is beneficial to system popularization. The upper computer is provided with software, and the software is particularly responsible for various tasks of the upper computer. The software has a double-port communication function and can simultaneously perform two-way communication with the optical machine control part and the printing motion control part. The software can read in the STL format file of the pre-printed 3D model and display the STL format file in a three-dimensional environment, and simultaneously provides model control functions including rotation, scaling, translation and the like, so that an operator can conveniently adjust relevant parameters of the pre-printed 3D model. The software can generate cross-section pictures with certain intervals of the pre-printed 3D model along the printing direction, the outline of the pre-printed 3D model at different positions along the printing direction is obtained according to triangle vertex information in the STL file, the internal and external directions of the pre-printed 3D model and the filling starting point of the model are obtained according to triangle normal vector information in the STL file, four-communication detection is carried out according to the internal filling starting point of the model, filling of the model is completed, and finally pictures are output according to filling information. The software can generate a printing control instruction, and based on the related information such as the layer height, the exposure time and the like given by an operator, a whole set of printing control instruction can be automatically generated according to grammar and stored in the memory of the upper computer. The software can monitor the current working condition of the printer, reflect the layer height printed currently and the exposure pattern projected currently, and facilitate operators to know the current working progress.
The optical machine control component adopts a singlechip, has lower cost and smaller volume, can be installed on a rack (a bottom plate 1, a supporting rod 2, an optical machine board 3, a bracket 4, a stand 5 and a mounting bracket 11), is internally provided with software, supports bidirectional communication with an upper computer and a DMD chip controller at the same time, is provided with a printing control instruction interpreter, interprets printing control instructions and drives corresponding ports, and executes corresponding commands. Besides, a fitting formula between the light intensity and the sub-resolution microstructure size parameter of the light source in the light source module and the relative positions of the light source array (the light source 6, the micro lens array 7), the first collimating lens 8 and the second collimating lens 12, which are obtained by theoretical formula, simulation and experimental data, is provided for calculating the position and the light intensity of each part.
The printing motion control part adopts a singlechip, has lower cost and smaller volume, can be also arranged on a frame (a bottom plate 1, a supporting rod 2, an optical machine bottom plate 3, a bracket 4, a stand 5 and a projection device frame 11), is internally provided with software, supports two-way communication with an upper computer, is provided with a printing control instruction interpreter, interprets printing control instructions and drives corresponding ports to execute corresponding commands.
The printing steps of the dual-resolution projection type photo-curing 3D printing system provided by the embodiment comprise:
s1, slicing the 3D model to be printed according to a set printing layer height by the upper computer to obtain model section pictures which are arranged in sequence;
s2, driving an optical machine movement device to control the light source array, the first collimating lens and the second collimating lens to move to corresponding positions by the optical machine control component according to the set microstructure size and the set position, and controlling the light source array to output set light intensity; the light source array emits light, and a plurality of groups of quasi-parallel light with different deflection angles are formed after passing through a collimating lens group consisting of a first collimating lens and a second collimating lens to irradiate the projection device. The number of groups of quasi-parallel light is the same as the number of light sources in the light source array;
simultaneously, the optical machine control component sequentially transmits the section pictures to the projection device, and the projection device generates corresponding exposure patterns according to the currently received section pictures and projects the exposure patterns to the printing platform;
s3, after the exposure pattern to be generated exposes the printing platform for a set time, generating a curing material with a certain thickness on a printing plane (working surface of the printing platform) to finish printing of the current layer;
s4, the printing motion control part drives the printing motion device to control the height of the printing platform to rise, and then the trough is controlled to be stripped from the printed material; lifting the printing platform to a printing layer height with the bottom of the trough after stripping, and restoring the trough to an initial state to prepare for printing of the next layer;
s4, repeating the steps S2 and S4 until printing of the whole model is completed.
Application:
by using the printing system and the printing method thereof, a 10-time projection objective is adopted, and the real light source is an LED lamp bead; a virtual light source is formed by using a 3*3 microlens array with single microlens size of 1.3mm x 1.3mm, and a method of adjusting the distance focusing of the collimating lens group is adopted to obtain a front equivalent focal length of 7.84mm and a rear equivalent focal length of 15.03mm for printing, so that a sample with a microstructure average width of 24.09 micrometers is obtained as shown in (a) of fig. 7. Fig. 7 (b) shows a surface printed by a conventional DLP printing system, in which a projection objective lens is a 10-magnification objective lens.
As can be seen from fig. 7, the surface printed by the dual-resolution projection type photo-curing 3D printing system provided by the embodiment of the invention has longitudinal grooves, and the microstructure is clear; the surface printed by the common printing system is messy, and no obvious structural characteristics exist.
In summary, the present embodiment implements the sub-resolution structure while printing the macro-resolution structure by controlling the aberration of the projection objective, so as to perform dual-resolution printing, and implement higher-precision printing on the premise of ensuring a larger printing format. Meanwhile, the lower-precision optical machine can have a high-precision printing effect to a certain extent, so that the equipment cost is effectively reduced.
The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of the invention should be assessed as that of the appended claims.

Claims (7)

1. The projection type photo-curing 3D printing system comprises a light source module;
the light source module comprises a light source array and a collimating lens group arranged between the light source array and the DMD chip;
the center of the light source array and the optical axis of the collimating lens group are positioned on the same straight line;
the collimating lens group receives the light emitted by the light source array and forms a plurality of groups of quasi-parallel light with different deflection angles to irradiate the DMD chip.
2. The projection light-curing 3D printing system of claim 1, wherein the array of light sources is comprised of an array of real light sources.
3. The projection type photo-curing 3D printing system according to claim 1, wherein the light source array is a virtual light source array constructed by a microlens array after a real light source emits light.
4. A projection light curing 3D printing system as claimed in claim 3, characterized in that an optical element for collimating the light path is arranged between the real light source and the micro lens array.
5. The projection type photo-curing 3D printing system as claimed in claim 1, wherein the collimating lens group comprises a plano-convex lens as a first collimating lens and a biconvex lens as a second collimating lens, and the optical axes of the plano-convex lens and the biconvex lens are positioned on the same straight line;
the first collimating lens is arranged close to the light source module, and the convex surface of the first collimating lens faces the light source module; the second collimating lens is arranged between the first collimating lens and the DMD chip.
6. The projection type photo-curing 3D printing system of claim 1, further comprising an optical mechanical movement device for adjusting the distance between the collimating lens group and the position of the light source array, wherein the collimating lens group and the light source array are respectively installed on the optical mechanical movement device.
7. The projection type photo-curing 3D printing system as claimed in claim 1, wherein a temperature sensor, a light intensity meter and a heat radiation fan are respectively arranged on the light source array.
CN202211272136.9A 2022-10-18 2022-10-18 Projection type photo-curing 3D printing system Pending CN116811235A (en)

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Application Number Priority Date Filing Date Title
CN202211272136.9A CN116811235A (en) 2022-10-18 2022-10-18 Projection type photo-curing 3D printing system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211272136.9A CN116811235A (en) 2022-10-18 2022-10-18 Projection type photo-curing 3D printing system

Publications (1)

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CN116811235A true CN116811235A (en) 2023-09-29

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