Low-light curing system based on dynamic focusing

Abstract

The utility model provides a low-light curing system based on dynamic focusing. The low-light curing system comprises an objective lens mechanism; the bearing surface of the curing platform is arranged on the first optical axis of the objective lens mechanism; the optical module comprises a laser source and a first beam splitter, the first beam splitter is arranged at the intersection of the first optical axis and a second optical axis of the laser source, the first beam splitter is located on the side, away from the bearing face, of the objective lens mechanism, and the first beam splitter is used for reflecting a laser beam of the laser source to the bearing face of the first optical axis from the second optical axis; and the dynamic zooming mechanism is used for changing the focal length of the laser beam so as to adjust the focal position of the laser beam on the first optical axis. According to the low-light curing system based on dynamic focusing, the mode that the dynamic zooming mechanism controls the focus to move on the first optical axis is used for replacing the mode that the curing platform moves on the first optical axis so that the laser beams can machine different planes on the first optical axis, and the machining efficiency is effectively improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of stereolithography, and in particular to a micro-light curing system based on dynamic focusing. Background Art

[0002] Stereolithography (SLA) is the earliest and most widely used 3D printing technology. It uses a top-down scanning process to solidify photosensitive resin to form complex three-dimensional structures. The laser beam moves along a specific trajectory, printing a layer of structure from points, lines, and surfaces. Several layers of photosensitive resin are superimposed together to form the desired model structure.

[0003] At present, stereolithography mostly uses the method of moving the curing platform to allow the laser beam to cure photosensitive resins on different planes. However, the liquid level control and scraper coating after the platform moves require a lot of time, resulting in low processing efficiency. Summary of the Invention

[0004] The present disclosure aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] To this end, an object of the present disclosure is to provide a micro-light curing system based on dynamic focusing.

[0006] To achieve the above-mentioned objectives, the present disclosure provides a micro-light curing system based on dynamic focusing, comprising: an objective lens mechanism; a curing platform, wherein the bearing surface of the curing platform is arranged on the first optical axis of the objective lens mechanism; an optical module, wherein the optical module comprises: a laser source and a first beam splitter, wherein the first beam splitter is arranged at the intersection of the first optical axis and the second optical axis of the laser source, and the first beam splitter is located on the side of the objective lens mechanism away from the bearing surface, and the first beam splitter is used to reflect the laser beam of the laser source from the second optical axis to the bearing surface of the first optical axis; a dynamic zoom mechanism, wherein the dynamic zoom mechanism is arranged on the second optical axis, and the dynamic zoom mechanism is used to change the focal length of the laser beam to adjust the focal position of the laser beam on the first optical axis.

[0007] Optionally, the dynamic zoom mechanism includes: a plurality of lenses, which are arranged in sequence and spaced apart on the second optical axis; a driving component, which is transmission-connected to at least one of the lenses, and is used to move at least one of the lenses along the second optical axis to adjust the focal position of the laser beam on the first optical axis.

[0008] Optionally, the multiple lenses are a positive telescope structure, and the driving assembly is transmission-connected to the negative focal length lens in the positive telescope structure, and the driving assembly is used to move the negative focal length lens along the second optical axis.

[0009] Optionally, the multiple lenses are a negative telescope structure, and the driving assembly is transmission-connected to the positive focal length lens in the negative telescope structure, and the driving assembly is used to move the positive focal length lens along the second optical axis.

[0010] Optionally, the driving assembly includes: a voice coil motor, a mover of the voice coil motor moves along the second optical axis, and at least one of the lenses is arranged on the mover of the voice coil motor.

[0011] Optionally, the driving component further includes: piezoelectric ceramics, the piezoelectric ceramics are arranged on the mover of the voice coil motor, and at least one of the lenses is arranged on the piezoelectric ceramics.

[0012] Optionally, the curing platform includes: a first displacement mechanism, a driving end of the first displacement mechanism is used for displacement along a first direction; a second displacement mechanism, the second displacement mechanism is arranged at the driving end of the first displacement mechanism, and the driving end of the second displacement mechanism is provided with the bearing surface and is used for displacement along a second direction; wherein the first direction, the second direction and the first optical axis are arranged perpendicularly to each other.

[0013] Optionally, the micro-light curing system further includes: an image acquisition module, wherein the acquisition end of the image acquisition module is arranged on the first optical axis, and the image acquisition module is located on the side of the first beam splitter away from the objective lens mechanism, and the image acquisition module is used to acquire the image on the carrying surface; a control module, wherein the input end of the control module is connected to the output end of the image acquisition module, and the output end of the control module is connected to the input end of the dynamic zoom mechanism, and the control module is used to process the image acquired by the image acquisition module, and to control the zoom action of the dynamic zoom mechanism.

[0014] Optionally, the image acquisition module includes: a camera, an illumination light source and a second beam splitter; wherein, the camera is arranged on the first optical axis and is used to acquire the image on the carrying surface, and the output end of the camera is connected to the input end of the control module; the second beam splitter is arranged at the intersection of the first optical axis and the third optical axis of the illumination light source, and the second beam splitter is located between the camera and the first beam splitter, and the second beam splitter is used to reflect the illumination light beam of the illumination light source from the third optical axis to the carrying surface of the first optical axis.

[0015] Optionally, the objective lens mechanism includes: a third displacement mechanism, the input end of the third displacement mechanism is connected to the output end of the control module, and the driving end of the third displacement mechanism is used to displace along the first optical axis; and a microscope objective lens, which is arranged at the driving end of the third displacement mechanism.

[0016] The technical solution provided by the present disclosure may have the following beneficial effects:

[0017] Because the first beam splitter is arranged at the intersection of the first optical axis and the second optical axis of the laser source, and the first beam splitter is located on the side of the objective lens mechanism away from the bearing surface, the first beam splitter can reflect the laser beam of the laser source from the second optical axis of the laser source to the first optical axis of the objective lens mechanism, and make the reflected laser beam pass through the objective lens mechanism to reach the bearing surface of the curing platform, thereby using the laser beam to achieve the curing processing of the model; and because the dynamic zoom mechanism is arranged on the second optical axis, the dynamic zoom mechanism can zoom the laser beam before reflection by the first beam splitter on the second optical axis, thereby achieving the focus position adjustment of the laser beam on the first optical axis after reflection by the first beam splitter, and then using the focus movement of the laser beam to achieve the curing processing of different planes on the first optical axis. Therefore, using the dynamic zoom mechanism to control the focus movement on the first optical axis instead of the curing platform moving on the first optical axis to allow the laser beam to process different planes on the first optical axis can save the time spent on liquid level height control and scraper coating after the curing platform moves, effectively improving the processing efficiency.

[0018] Additional aspects and advantages of the present disclosure will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present disclosure will become apparent and readily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0020] Figure 1 is a three-dimensional schematic diagram of a dynamic focusing-based micro-light curing system proposed in one embodiment of the present disclosure;

[0021] Figure 2 1 is a partial front view schematic diagram of a dynamic focusing-based micro-light curing system proposed in one embodiment of the present disclosure;

[0022] Figure 3 Schematic diagram of the optical path of a micro-light curing system based on dynamic focusing proposed in one embodiment of the present disclosure;

[0023] Figure 4 1 is a structural diagram of a dynamic zoom mechanism in a micro-light curing system based on dynamic focusing according to an embodiment of the present disclosure;

[0024] As shown in the figure: 1, curing platform, 11, first displacement mechanism, 12, second displacement mechanism;

[0025] 2. Objective lens mechanism, 21. Third displacement mechanism, 22. Microscope objective lens;

[0026] 3. Optical module, 31. Laser source, 32. First beam splitter;

[0027] 4. Dynamic zoom mechanism, 41. Lens, 42. Drive assembly, 421. Voice coil motor, 422. Piezoelectric ceramics;

[0028] 5. Image acquisition module, 51. Camera, 52. Illumination light source, 53. Second beam splitter;

[0029] 100, first optical axis, 200, second optical axis, 300, third optical axis. DETAILED DESCRIPTION

[0030] The following describes in detail embodiments of the present disclosure, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present disclosure and are not to be construed as limiting the present disclosure. On the contrary, the embodiments of the present disclosure include all variations, modifications, and equivalents that fall within the spirit and scope of the appended claims.

[0031] like Figure 1 、 Figure 2 and Figure 3 As shown, an embodiment of the present disclosure proposes a micro-light curing system based on dynamic focusing, including: an objective lens mechanism 2, a curing platform 1, an optical module 3 and a dynamic zoom mechanism 4. The bearing surface of the curing platform 1 is set on the first optical axis 100 of the objective lens mechanism 2, and the optical module 3 includes: a laser source 31 and a first beam splitter 32. The first beam splitter 32 is set at the intersection of the first optical axis 100 and the second optical axis 200 of the laser source 31, and the first beam splitter 32 is located on the side of the objective lens mechanism 2 away from the bearing surface. The first beam splitter 32 is used to reflect the laser beam of the laser source 31 from the second optical axis 200 to the bearing surface of the first optical axis 100. The dynamic zoom mechanism 4 is set on the second optical axis 200, and the dynamic zoom mechanism 4 is used to change the focal length of the laser beam to adjust the focal position of the laser beam on the first optical axis 100.

[0032] It can be understood that since the first beam splitter 32 is arranged at the intersection of the first optical axis 100 and the second optical axis 200 of the laser source 31, and the first beam splitter 32 is located on the side of the objective lens mechanism 2 away from the bearing surface, the first beam splitter 32 can reflect the laser beam of the laser source 31 from the second optical axis 200 of the laser source 31 to the first optical axis 100 of the objective lens mechanism 2, and make the reflected laser beam pass through the objective lens mechanism 2 to reach the bearing surface of the curing platform 1, thereby using the laser beam to realize the curing processing of the model.

[0033] Furthermore, because the dynamic zoom mechanism 4 is disposed on the second optical axis 200, it can zoom the laser beam before being reflected by the first beam splitter 32 on the second optical axis 200, thereby adjusting the focal position of the laser beam on the first optical axis 100 after being reflected by the first beam splitter 32. Furthermore, the movement of the laser beam's focus can be used to achieve curing processing on different planes on the first optical axis 100. Thus, by using the dynamic zoom mechanism 4 to control the movement of the focus on the first optical axis 100 instead of moving the curing platform on the first optical axis 100, the laser beam can be used to process different planes on the first optical axis 100. This can eliminate the time spent on liquid level control and scraper coating after the curing platform 1 moves, effectively improving processing efficiency.

[0034] It should be noted that the curing platform 1 is used to form a bearing surface and support the model being cured. The specific type of the curing platform 1 can be set according to actual needs and is not limited thereto. During the initialization phase, the objective lens mechanism 2 is located at the center of the bearing surface, and the bearing surface and the first optical axis 100 of the objective lens mechanism 2 are arranged perpendicularly.

[0035] Objective lens mechanism 2 is used to focus the light beam. For example, when a laser beam passes through objective lens mechanism 2, the focusing effect of objective lens mechanism 2 is utilized to converge the laser beam energy and act on the liquid photosensitive resin on curing platform 1, thereby achieving curing and printing. The specific type of objective lens mechanism 2 can be set according to actual needs and is not limited thereto. Specifically, first optical axis 100 of objective lens mechanism 2 serves as the main optical axis of the micro-light curing system, and the laser beam, illumination beam, etc. all perform corresponding functions on the main optical axis. Objective lens mechanism 2 has a high numerical aperture. When the wavelength range of the laser beam from laser source 31 is at the edge of the absorption band of the photocurable adhesive, the absorption of the laser by the photocurable adhesive is close to zero. The high light intensity in the focused area reaches the threshold of single-photon absorption, causing the material to cure. The non-focused area is unaffected due to its near-zero absorption rate.

[0036] The optical module 3 is used to generate a laser beam on the first optical axis 100. Specifically, the laser source 31 of the optical module 3 is used to generate a laser beam, and the first beam splitter 32 is used to convert the laser beam generated by the laser source 31 on the second optical axis 200 to the bearing surface of the first optical axis 100.

[0037] The specific type of the laser source 31 can be set according to actual needs and is not limited thereto.

[0038] The specific type of the first beam splitter 32 can be set according to actual needs and is not limited to this. For example, the first optical axis 100 and the second optical axis 200 are arranged vertically, and the reflecting surface of the first beam splitter 32 is at a 45-degree angle to the first optical axis 100 and the second optical axis 200 respectively; the first beam splitter 32 can be a semi-transparent and semi-reflective mirror.

[0039] The dynamic zoom mechanism 4 is used to change the focal length of the laser beam to adjust the focal position of the laser beam on the first optical axis 100. The specific type of the dynamic zoom mechanism 4 can be set according to actual needs and is not limited thereto.

[0040] In the micro-light curing system, the arrangement of various components can be attached to supporting parts such as a base and a bracket. For example, the bracket is arranged on the base in an inverted U shape (gantry), the curing platform 1 is arranged on the base and located in the U-shaped groove of the bracket, the objective lens mechanism 2 is arranged on the bracket, and the optical module 3 and the dynamic zoom mechanism 4 are arranged on the bracket in sequence using multiple columns, support plates and other structural parts.

[0041] like Figure 4 As shown, in some embodiments, the dynamic zoom mechanism 4 includes: a plurality of lenses 41 and a driving assembly 42, the plurality of lenses 41 are arranged in sequence and spaced apart on the second optical axis 200, the driving assembly 42 is transmission-connected to at least one lens 41, and the driving assembly 42 is used to move at least one lens 41 along the second optical axis 200 to adjust the focal position of the laser beam on the first optical axis 100.

[0042] It can be understood that, since the multiple lenses 41 are sequentially arranged at intervals on the second optical axis 200, the laser beam emitted by the laser source 31 can be reflected onto the first optical axis 100 by the first beam splitter 32 after being refracted and focused by the multiple lenses 41 in sequence, and the focus of the laser beam is ensured to be stable at the bearing surface. At the same time, since the drive assembly 42 is connected to at least one lens 41 by transmission, the drive assembly 42 can drive at least one lens 41 to move along the second optical axis 200, thereby achieving zooming of the laser beam on the second optical axis 200 before reflection by the first beam splitter 32, and further achieving adjustment of the focus position of the laser beam on the first optical axis 100 after reflection by the first beam splitter 32. Thus, the movement of at least one lens 41 on the second optical axis 200 enables curing processing of different planes on the first optical axis 100, effectively improving processing efficiency.

[0043] It should be noted that lens 41 is used to diverge or converge the laser beam. Multiple lenses 41 cooperate to achieve front-end focusing of the laser beam. The specific type of lens 41 can be set according to actual needs and is not limited to this. Among the multiple lenses 41, there can be convex lenses 41 or concave lenses 41.

[0044] The driving component 42 is used to drive at least one lens 41 to move on the second optical axis 200 to adjust the spacing between each lens 41, and then adjust the focal position of the laser beam on the first optical axis 100. The specific type of the driving component 42 can be set according to actual needs and is not limited to this.

[0045] In some embodiments, the multiple lenses 41 are a positive telescope structure, and the driving component 42 is transmission-connected to the negative focal length lens 41 in the positive telescope structure, and the driving component 42 is used to move the negative focal length lens 41 along the second optical axis 200 .

[0046] It can be understood that the positive telescope structure is arranged on the second optical axis 200, so that the laser beam emitted by the laser source 31 can be reflected onto the first optical axis 100 by the first beam splitter 32 after being focused by the positive telescope structure in sequence, and the focus of the laser beam is ensured to be stable at the bearing surface. At the same time, because the drive assembly 42 is connected to the negative focal length lens 41 in the positive telescope structure, the drive assembly 42 can drive the negative focal length lens 41 to move along the second optical axis 200, thereby achieving zooming of the laser beam before reflection by the first beam splitter 32 on the second optical axis 200, and further achieving adjustment of the focal position of the laser beam after reflection by the first beam splitter 32 on the first optical axis 100. Therefore, the movement of the negative focal length lens 41 in the positive telescope structure on the second optical axis 200 is used to achieve curing processing of different planes on the first optical axis 100, effectively improving processing efficiency.

[0047] In some embodiments, the multiple lenses 41 are a negative telescope structure, and the driving component 42 is transmission-connected to the positive focal length lens 41 in the negative telescope structure, and the driving component 42 is used to move the positive focal length lens 41 along the second optical axis 200 .

[0048] It can be understood that the negative telescope structure is arranged on the second optical axis 200, so that the laser beam emitted by the laser source 31 can be reflected onto the first optical axis 100 by the first beam splitter 32 after being focused by the negative telescope structure in sequence, and the focus of the laser beam is ensured to be stable at the bearing surface. At the same time, because the drive assembly 42 is connected to the positive focal length lens 41 in the negative telescope structure, the drive assembly 42 can drive the positive focal length lens 41 to move along the second optical axis 200, thereby achieving zooming of the laser beam before reflection by the first beam splitter 32 on the second optical axis 200, and further achieving adjustment of the focal position of the laser beam after reflection by the first beam splitter 32 on the first optical axis 100. Therefore, the movement of the positive focal length lens 41 in the negative telescope structure on the second optical axis 200 is used to achieve curing processing of different planes on the first optical axis 100, effectively improving processing efficiency.

[0049] It should be noted that the multiple lenses 41 include: a first lens, a second lens and a third lens. The first lens, the second lens and the third lens are arranged in sequence along the direction from the laser source 31 to the first beam splitter 32. The function of the first lens and the second lens is to expand the laser beam. The focal length ratio is adjusted according to the incident pupil diameter and the exit pupil diameter of the required dynamic focusing light path. Specifically, the main function of the first lens and the second lens is to make the laser beam diameter match (be consistent with) the incident aperture of the scanning head. The function of the third lens is to focus the expanded laser. Its focal length is mainly determined by the exit working length of the dynamic focusing light path, and its position is adjacent to the incident pupil of the scanning head.

[0050] Among them, the positive telescope structure is also called a Keplerian structure, and the first lens of the positive telescope structure is a negative focal length lens 41, and a plano-convex lens 41 or a best-shape lens 41 can be used; the negative telescope structure is also called a Galilean structure, and the first lens of the negative telescope structure is a positive focal length lens 41, and a plano-concave lens 41 or a concave lens 41 can be used to further reduce the spherical aberration of the system.

[0051] The negative telescope structure is more suitable for high-power applications, such as ultrafast laser processing. It does not produce an intermediate focus, and the overall optical path length is shorter than that of the positive telescope structure under the same working range. However, the negative focal length lens 41 will limit the distance between the virtual focus point (the real focus in the positive telescope structure) and the second lens, thereby limiting the maximum working range.

[0052] Both the positive and negative telescope structures are based on an optical lever structure with three lenses 41, employing a front-focusing laser scanning dynamic focusing optical path. This means that by varying the distance between lenses 41, the dynamic focusing characteristics can be altered to achieve different focusing effects. The so-called optical lever refers to the ratio between the focal change distance and the displacement of lenses 41. This ratio requires the selection of different lenses 41 for specific design needs. The optical lever ratio must be large enough to achieve sufficient focal position change distance and maintain the required zoom accuracy while reducing the displacement distance of lenses 41 to improve the response speed and accuracy of lens 41 movement. Therefore, when designing the optical lever mechanism, it is important to consider the achievable lens 41 movement range and accuracy, as well as the desired focus range.

[0053] like Figure 4 As shown, in some embodiments, the driving assembly 42 includes: a voice coil motor 421 , a mover of the voice coil motor 421 moves along the second optical axis 200 , and at least one lens 41 is disposed on the mover of the voice coil motor 421 .

[0054] It can be understood that since the mover of the voice coil motor 421 moves along the second optical axis 200 and at least one lens 41 is arranged on the mover of the voice coil motor 421, the voice coil motor 421 can use the drive of the mover to realize the movement of at least one lens 41 on the second optical axis 200, thereby using the moving lens 41 to adjust the focal position of the laser beam on the first optical axis 100, and then use the focus movement of the laser beam to realize curing processing on different planes on the first optical axis 100.

[0055] It should be noted that the voice coil motor (VCM) 421 is a special form of direct-drive motor whose operating principle is primarily based on the Ampere force principle. Specifically, the operating principle of the voice coil motor 421 is that when a current-carrying coil (conductor) is placed in a magnetic field, a force is generated, and the magnitude of this force is proportional to the current applied to the coil. Specifically, a permanent magnet generates a fixed magnetic field, and the coil is placed in this magnetic field. When current flows through the coil, according to Ampere's force law, the current-carrying conductor is subjected to a force in the magnetic field. The magnitude of this force is proportional to the current flowing through the coil, the magnetic field strength, and the effective length of the coil in the magnetic field. By controlling the magnitude and direction of the current, the speed and direction of the coil's movement can be precisely controlled.

[0056] The specific type of the voice coil motor 421 can be set according to actual needs and is not limited thereto.

[0057] like Figure 4 As shown, in some embodiments, the driving component 42 further includes: a piezoelectric ceramic 422 , the piezoelectric ceramic 422 is disposed on a mover of the voice coil motor 421 , and at least one lens 41 is disposed on the piezoelectric ceramic 422 .

[0058] It can be understood that since the piezoelectric ceramic 422 is arranged on the mover of the voice coil motor 421, and at least one lens 41 is arranged on the piezoelectric ceramic 422, at least one lens 41 can use the voice coil motor 421 to achieve a large range of movement on the second optical axis 200, while also using the piezoelectric ceramic 422 to achieve a small range of movement on the second optical axis 200, thereby compensating for the motion error of the voice coil motor 421 and achieving high-precision motion control.

[0059] It should be noted that the piezoelectric ceramic 422 realizes the conversion of electrical energy into mechanical energy based on the piezoelectric effect. Specifically, the piezoelectric effect refers to the phenomenon that when the piezoelectric ceramic 422 is deformed by an external force, polarization will occur inside it, and at the same time, opposite charges will appear on some of its relative surfaces. This effect is reversible, that is, when an electric field is applied to the piezoelectric ceramic 422, it will also deform.

[0060] The specific type of the piezoelectric ceramic 422 can be set according to actual needs and is not limited thereto.

[0061] Among them, when the lens 41, voice coil motor 421 and piezoelectric ceramic 422 are arranged, the stator of the voice coil motor 421, the second lens and the third lens are respectively fixed on the supporting plate on the bracket, and the piezoelectric ceramic 422 and the first lens are fixed on the mover of the voice coil motor 421 in sequence.

[0062] Furthermore, the driving component 42 may also include: a flexible mechanism, which is arranged between the piezoelectric ceramic 422 and the lens 41, and the piezoelectric ceramic 422 drives the flexible mechanism to deform to drive the lens 41 to move, wherein the flexible mechanism can also adjust the displacement ratio from the displacement output end of the piezoelectric ceramic 422 to the displacement input end of the lens 41.

[0063] Specifically, a flexible mechanism can be a flexible hinge mechanism, also known as a flexible pivot, flexible bearing, or cross-spring bearing. It is a simple, relatively regular elastic support. A flexible hinge mechanism has a rotation center that coincides with its geometric center axis and operates by utilizing the limited deformation of elastic thin sheets uniformly distributed radially around the circumference. Under torsional load, it can generate rotational motion around its rotation center within a limited angular range. This mechanism offers numerous advantages, including no mechanical friction, no backlash, high motion sensitivity, compact dimensions, ease of control, and stable operation.

[0064] The curing platform can be a dual-axis XY motion platform, a flexible XY motion platform, a three-axis XYZ motion platform, or even a multi-axis motion platform. The flexible XY motion platform can include two fine-tuning mechanisms and a flexible decoupling bracket, which is mounted on the fine-tuning mechanisms. In this embodiment, the fine-tuning mechanism is an XYZ precision motion slide, and the flexible decoupling bracket includes a module based on a flexible leaf spring, which prevents overconstraint during fine-tuning of the two XYZ precision motion slides.

[0065] like Figure 1 As shown, in some embodiments, the curing platform includes a first displacement mechanism 11 and a second displacement mechanism 12. The driving end of the first displacement mechanism 11 is configured to displace the first direction. The second displacement mechanism 12 is disposed at the driving end of the first displacement mechanism 11. The driving end of the second displacement mechanism 12 is provided with a bearing surface and configured to displace the second direction. The first direction, the second direction, and the first optical axis 100 are arranged perpendicular to each other.

[0066] It is understood that because the second displacement mechanism 12 is disposed at the driving end of the first displacement mechanism 11, and the driving end of the second displacement mechanism 12 is provided with a bearing surface, the first and second displacement mechanisms 11 and 12 cooperate to achieve movement of the bearing surface in the first and second directions. Thus, by utilizing the movement of the laser beam focus along the first optical axis 100 and the movement of the bearing surface in the first and second directions, the laser beam focus can be caused to perform X, Y, and Z triaxial motion relative to the photocurable adhesive on the bearing surface, thereby achieving three-dimensional micro-photocuring and meeting processing requirements.

[0067] It should be noted that the first displacement mechanism 11 is used to achieve movement of the bearing surface in the first direction. The specific type of the first displacement mechanism 11 can be set according to actual needs and is not limited to this. For example, the first displacement mechanism 11 may include: a first motor, a first screw, and a first slide. The first motor is disposed on a base, the first screw is rotatably disposed on the base, the first slide is slidably disposed on the base along the first direction, and one end of the first screw is connected to the output shaft of the first motor. The first screw is threadedly connected to the first slide, and the second displacement mechanism 12 is disposed on the first slide. Thus, the first motor uses the first screw to drive the first slide to move in the first direction to achieve position adjustment of the bearing surface in the first direction.

[0068] The second displacement mechanism 12 is used to achieve movement of the bearing surface in the second direction. The specific type of the second displacement mechanism 12 can be set according to actual needs and is not limited to this. For example, the second displacement mechanism 12 may include: a second motor, a second lead screw, and a second slide. The second motor is disposed on the first slide, the second lead screw is rotatably disposed on the first slide, the second slide is slidably disposed on the first slide along the second direction, and one end of the second lead screw is connected to the output shaft of the second motor by a transmission, the second lead screw is connected to the second slide by a threaded transmission, and the bearing surface is disposed on the second slide. Thus, the second motor uses the second lead screw to drive the second slide to move in the second direction to achieve position adjustment of the bearing surface in the second direction.

[0069] The first optical axis 100 is located on the Z axis, and the first direction and the second direction are located on the X axis and the Y axis respectively.

[0070] like Figure 1As shown, in some embodiments, the micro-light curing system further includes: an image acquisition module 5 and a control module (not shown in the figure), the acquisition end of the image acquisition module 5 is arranged on the first optical axis 100, and the image acquisition module 5 is located on the side of the first beam splitter 32 away from the objective lens mechanism 2, the image acquisition module 5 is used to acquire the image on the carrying surface, the input end of the control module is connected to the output end of the image acquisition module 5, and the output end of the control module is connected to the input end of the dynamic zoom mechanism 4, the control module is used to process the image acquired by the image acquisition module 5, and to control the zoom action of the dynamic zoom mechanism 4.

[0071] It can be understood that since the acquisition end of the image acquisition module 5 is set on the first optical axis 100, and the input end of the control module is connected to the output end of the image acquisition module 5, the micro-light curing system can use the focus movement of the laser beam to achieve curing processing, while also using the image acquisition of the image acquisition module 5 and the image processing of the control module to monitor the curing processing status on the carrying surface, thereby ensuring the accurate printing of the model.

[0072] It should be noted that the image acquisition module 5 is used to acquire images on the carrying surface. The specific type of the image acquisition module 5 can be set according to actual needs and is not limited to this.

[0073] The control module is used to process the images captured by the image acquisition module 5 and to control the zoom action of the dynamic zoom mechanism 4. The specific type of the control module can be set according to actual needs and is not limited to this. For example, the control module can be a single-chip microcomputer. Furthermore, the control module can also include: a display, a computer, etc.

[0074] like Figure 2 and Figure 3 As shown, in some embodiments, the image acquisition module 5 includes: a camera 51, an illumination light source 52 and a second beam splitter 53; wherein, the camera 51 is arranged on the first optical axis 100 and is used to acquire images on the carrying surface, and the output end of the camera 51 is connected to the input end of the control module, the second beam splitter 53 is arranged at the intersection of the first optical axis 100 and the third optical axis 300 of the illumination light source 52, and the second beam splitter 53 is located between the camera 51 and the first beam splitter 32, and the second beam splitter 53 is used to reflect the illumination light beam of the illumination light source 52 from the third optical axis 300 to the carrying surface of the first optical axis 100.

[0075] It can be understood that since the second beam splitter 53 is arranged at the intersection of the first optical axis 100 and the third optical axis 300 of the illumination light source 52, and the second beam splitter 53 is located between the camera 51 and the first beam splitter 32, the second beam splitter 53 can reflect the illumination light beam of the illumination light source 52 from the third optical axis 300 to the bearing surface of the first optical axis 100, thereby realizing illumination of the bearing surface, and, by utilizing the light transmittance characteristics of the first beam splitter 32 and the second beam splitter 53, the illumination light beam on the bearing surface can also be reflected through the first beam splitter 32 and the second beam splitter 53 to the shooting end of the camera 51, thereby realizing the collection of images on the bearing surface by the camera 51.

[0076] It should be noted that the camera 51 is used to collect images on the carrying surface. The specific type of the camera 51 can be set according to actual needs and is not limited to this.

[0077] The illumination light source 52 is used to generate an illumination light beam, and the second beam splitter 53 is used to convert the illumination light beam generated by the illumination light source 52 on the third optical axis 300 to the bearing surface of the first optical axis 100 .

[0078] The specific type of the lighting source 52 can be set according to actual needs and is not limited thereto.

[0079] The specific type of the second beam splitter 53 can be set according to actual needs and is not limited to this. For example, the first optical axis 100 and the third optical axis 300 are arranged vertically, and the reflecting surface of the second beam splitter 53 is at a 45-degree angle to the first optical axis 100 and the third optical axis 300 respectively; the second beam splitter 53 can be a semi-transparent and semi-reflective mirror.

[0080] The camera 51 , the illumination light source 52 and the second beam splitter 53 of the image acquisition module 5 can be sequentially arranged on the bracket using a plurality of columns, a supporting plate and other structural components.

[0081] like Figure 2 and Figure 3 As shown, in some embodiments, the objective lens mechanism 2 includes: a third displacement mechanism 21 and a microscope objective lens 22, the input end of the third displacement mechanism 21 is connected to the output end of the control module, and the driving end of the third displacement mechanism 21 is used to displace along the first optical axis 100, and the microscope objective lens 22 is arranged at the driving end of the third displacement mechanism 21.

[0082] It can be understood that since the microscope objective lens 22 is arranged at the driving end of the third displacement mechanism 21, the microscope objective lens 22 can focus the laser beam while also utilizing the third displacement mechanism 21 to achieve movement on the first optical axis 100, thereby facilitating the use of the movement of the microscope objective lens 22 to achieve accurate image acquisition by the image acquisition module 5.

[0083] It should be noted that the specific type of the microscope objective lens 22 can be set according to actual needs and is not limited thereto. The first optical axis 100 refers to the optical axis of the microscope objective lens 22 .

[0084] The third displacement mechanism 21 is used to achieve the movement of the microscope objective lens 22 on the first optical axis 100. The specific type of the third displacement mechanism 21 can be set according to actual needs and is not limited to this. For example, the third displacement mechanism 21 may include: a third motor, a third lead screw, and a third slide. The third motor is disposed on a bracket, the third lead screw is rotatably disposed on the bracket, the third slide is slidably disposed on the bracket along the first optical axis 100, and one end of the third lead screw is connected to the output shaft of the third motor by a transmission, the third lead screw is connected to the third slide by a threaded transmission, and the microscope objective lens 22 is disposed on the third slide. Thus, the third motor uses the third lead screw to drive the third slide to move along the first optical axis 100 to achieve the position adjustment of the microscope objective lens 22 on the first optical axis 100.

[0085] In the micro-light curing system of this embodiment, the image acquisition module 5 collects the coaxial imaging and spot image on the carrying surface, and the control module processes the coaxial imaging and controls the lens 41 mechanism so that the image acquisition module 5 obtains a clear image of the reference plane. The specific process is as follows:

[0086] The control module uses an energy gradient-based image processing algorithm to process the coaxial imaging. The control module controls the intermittent movement from one end of the stroke limit to the other end. The control module continuously uses the image processing algorithm to process the coaxial imaging collected by the image acquisition module 5, and stores the obtained clarity evaluation value in the control module. When the clarity evaluation value reaches a peak value, the control module controls the third displacement mechanism 21 to move to the corresponding position, so that the image acquisition module 5 obtains a clear image of the reference plane.

[0087] At the same time, the control module processes the spot image and controls the dynamic zoom mechanism 4 to make the focus of the laser beam fall on the reference plane to complete initialization.

[0088] Among them, the light emitted by the illumination light source 52 and the laser source 31 respectively enters the first optical axis 100 through the beam splitter, reaches the reference plane of the carrying surface through the microscope objective lens 22, and the reflected light on the reference plane is transmitted into the camera 51 after passing through the microscope objective lens 22. After the camera 51 transmits the image information to the control module, the control module applies the relevant algorithm to process the image, controls the third displacement mechanism 21 to make the microscope objective lens 22 move on the first optical axis 100, and ensures that the camera 51 has a clear microscopic image of the reference plane.

[0089] Furthermore, the control module processes the laser spot in the image, and controls the dynamic zoom mechanism 4 so as to minimize the laser spot so as to make the focus of the laser beam fall on the reference plane.

[0090] The parameters of the lens 41 of the dynamic zoom mechanism 4 are stored in the control module, so that after the laser beam focus is initialized, the control module calculates how to control the dynamic zoom mechanism 4 so as to move the laser beam focus to a required distance.

[0091] It should be noted that, in the description of this disclosure, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance. In addition, in the description of this disclosure, unless otherwise specified, the meaning of "plurality" is two or more.

[0092] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present disclosure includes additional implementations in which functions may be performed out of the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present disclosure belong.

[0093] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0094] Although the embodiments of the present disclosure have been shown and described above, it is understood that the above embodiments are illustrative and are not to be construed as limitations on the present disclosure. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present disclosure.

Claims

1. A micro-light curing system based on dynamic focusing, characterized in that: include: Objective lens mechanism; a curing platform, wherein a bearing surface of the curing platform is arranged on the first optical axis of the objective lens mechanism; An optical module, comprising: a laser source and a first beam splitter, wherein the first beam splitter is disposed at the intersection of the first optical axis and the second optical axis of the laser source, and the first beam splitter is located on a side of the objective lens mechanism away from the bearing surface, and the first beam splitter is used to reflect the laser beam of the laser source from the second optical axis to the bearing surface of the first optical axis; A dynamic zoom mechanism is provided on the second optical axis and is used to change the focal length of the laser beam to adjust the focal position of the laser beam on the first optical axis.

2. The dynamic focusing micro-light curing system according to claim 1, characterized in that: The dynamic zoom mechanism comprises: a plurality of lenses, wherein the plurality of lenses are sequentially spaced apart and arranged on the second optical axis; A driving assembly is connected to at least one of the lenses in a transmission manner, and is used to move at least one of the lenses along the second optical axis to adjust the focal position of the laser beam on the first optical axis.

3. The dynamic focusing micro-light curing system according to claim 2, characterized in that: The multiple lenses are a positive telescope structure, and the driving component is transmission-connected to the negative focal length lens in the positive telescope structure, and the driving component is used to move the negative focal length lens along the second optical axis.

4. The dynamic focusing micro-light curing system according to claim 2, characterized in that: The multiple lenses are a negative telescope structure, and the driving component is transmission-connected to the positive focal length lens in the negative telescope structure, and the driving component is used to move the positive focal length lens along the second optical axis.

5. The dynamic focusing-based micro-light curing system according to claim 2, characterized in that: The drive assembly includes: A voice coil motor, wherein a mover of the voice coil motor moves along the second optical axis, and at least one lens is arranged on the mover of the voice coil motor.

6. The dynamic focusing micro-light curing system according to claim 5, characterized in that: The drive assembly further includes: The piezoelectric ceramic is arranged on the mover of the voice coil motor, and at least one lens is arranged on the piezoelectric ceramic.

7. The dynamic focusing-based micro-light curing system according to claim 1, characterized in that: The curing platform comprises: a first displacement mechanism, wherein a driving end of the first displacement mechanism is configured to displace along a first direction; a second displacement mechanism, the second displacement mechanism being arranged at a driving end of the first displacement mechanism, the driving end of the second displacement mechanism being provided with the bearing surface and being used for displacement along a second direction; The first direction, the second direction and the first optical axis are arranged perpendicular to each other.

8. The dynamic focusing micro-light curing system according to any one of claims 1 to 7, characterized in that: The micro-light curing system further comprises: an image acquisition module, wherein the acquisition end of the image acquisition module is arranged on the first optical axis, and the image acquisition module is located on a side of the first beam splitter away from the objective lens mechanism, and the image acquisition module is used to acquire an image on the carrying surface; A control module, wherein the input end of the control module is connected to the output end of the image acquisition module, and the output end of the control module is connected to the input end of the dynamic zoom mechanism, and the control module is used to process the image captured by the image acquisition module and to control the zoom action of the dynamic zoom mechanism.

9. The dynamic focusing-based micro-light curing system according to claim 8, characterized in that: The image acquisition module includes: Camera, illumination source and second beam splitter; The camera is arranged on the first optical axis and is used to capture an image on the carrying surface, and an output end of the camera is connected to an input end of the control module; The second beam splitter is arranged at the intersection of the first optical axis and the third optical axis of the illumination light source, and the second beam splitter is located between the camera and the first beam splitter, and the second beam splitter is used to reflect the illumination light beam of the illumination light source from the third optical axis to the bearing surface of the first optical axis.

10. The dynamic focusing-based micro-light curing system according to claim 8, characterized in that: The objective lens mechanism comprises: a third displacement mechanism, wherein an input end of the third displacement mechanism is connected to an output end of the control module, and a driving end of the third displacement mechanism is used for displacement along the first optical axis; A microscope objective lens is arranged at the driving end of the third displacement mechanism.

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