High-precision 3D printing system based on pulse laser control

Abstract

The invention discloses a high-precision 3D printing system based on pulse laser control, and the system comprises a DLP module which is used for generating an RGB pulse signal and a DMD overturning signal according to an image data signal; the OR gate logic module is used for performing logic judgment on the RGB pulse signal generated by the DLP module and outputting a Y signal, the Y signal is a level signal after logic judgment, the Y signal output by the OR gate logic module is low level when the RGB pulse signal is expressed as 0 gray scale, and the Y signal output by the OR gate logic module is high level when the RGB pulse signal is not 0 gray scale; according to the light source control mode, the switching time of the pulse laser can be dynamically adjusted by utilizing the data logic operation and storage function of the OR gate logic module according to the gray-scale value of an image data signal, so that the intensity and time of an optical signal are controlled to be matched with the curing characteristic of a liquid resin material; and meanwhile, energy consumption is reduced, the image contrast is improved, and high-quality 3D printing is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D printing, and particularly to a high-precision 3D printing system based on pulsed laser control. Background Art

[0002] 3D printing is a technology that uses digital model files to convert virtual models into physical models by stacking materials layer by layer. 3D printing of resin materials usually adopts the principle of photocuring, using a light source to cure liquid resin, and thus a technology of stacking layer by layer to form a shape. The key components of the photocuring 3D printing technology are the light source and the optical machine. The light source is used to provide light that can cure the resin, and the optical machine is used to control the projection and imaging of the light.

[0003] Currently, common light sources in the photocuring 3D printing technology include pulsed lasers, and common optical machines include digital micromirror devices (DMD) and holographic projection, etc. Among them, DMD is a digital display chip based on microelectromechanical systems (MEMS). It consists of millions of tiny mirrors, and each mirror can independently control its reflection direction, thus converting the image signal into a corresponding optical signal. DMD has the advantages of high resolution, fast response speed, high contrast, etc., and is widely used in the photocuring 3D printing technology.

[0004] However, the existing photocuring 3D printing technology based on DMD still has some problems and deficiencies, which are mainly manifested in the following aspects: Since DMD still generates weak light output when displaying a black image (0 gray level), these light outputs will not only affect the contrast of the image, but also cause waste of energy. Therefore, it is necessary to effectively control the light output of DMD to reduce energy consumption and improve image contrast. Summary of the Invention

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A high-precision 3D printing system based on pulsed laser control, comprising:

[0007] A DLP module, configured to generate an RGB pulse signal and a DMD flip signal according to an image data signal;

[0008] An OR gate logic module, configured to perform a logical judgment on the RGB pulse signal generated by the DLP module and output a Y signal. The Y signal is a level signal after logical judgment. When the RGB pulse signal represents 0 gray level, the OR gate logic module outputs the Y signal as a low level, and when it is a non-0 gray level, the OR gate logic module outputs the Y signal as a high level;

[0009] A pulsed laser, configured to receive the Y signal, control the on / off state of the pulsed laser according to the change of the Y signal, and output a pulsed LD light source;

[0010] The DMD module is used to receive the DMD flipping signal, and then control the micromirror array in the DMD module to flip according to the gray scale value of the image data signal. The pulsed LD light source is transmitted to the DMD module and outputs an optical signal after matching the flipping state of the DMD module.

[0011] As a further solution of the present invention: The galvanometer is used to receive the optical signal, and then control the rotation angle of the reflecting mirror, so as to scan the optical signal to the required position; The lens is used to receive the optical signal, and then adjust the direction and focal length of the light, so as to focus the optical signal on the surface of the liquid resin material and cure it according to the intensity and time of the optical signal, thereby forming a 3D printed object.

[0012] As a further solution of the present invention: The Y signal is transmitted to the pulsed laser. When the Y signal is at a high level, the LD light source of the pulsed laser is turned on and outputs light intensity. When the Y signal is at a low level, the LD light source of the pulsed laser is turned off and there is no output.

[0013] As a further solution of the present invention: The DLP module includes a light source module and a digital micromirror device. The light source module is used to convert the image data signal into an RGB pulsed signal, and the digital micromirror device is used to convert the image data signal into a DMD flipping signal.

[0014] As a further solution of the present invention: The light source module includes a light emitting source and a grating. The light source is used to emit white light, and the grating is used to decompose the white light into RGB primary color lights and modulate the RGB primary color lights according to the gray scale value of the image data signal, thereby generating an RGB pulsed signal.

[0015] As a further solution of the present invention: The digital micromirror device includes a micromirror array and a driving circuit. The micromirror array is composed of millions of flippable micromirrors, and each micromirror corresponds to a pixel point. The driving circuit is used to control the flipping state of each micromirror according to the gray scale value of the image data signal, thereby generating a DMD flipping signal.

[0016] As a further solution of the present invention: A lens is further provided between the DMD module and the galvanometer. The lens is used to converge the optical signal output by the DMD module onto the galvanometer.

[0017] As a further solution of the present invention: The OR gate logic module belongs to the creation particle function module and is used for logical operation and storage of data.

[0018] As a further solution of the present invention: The pulsed laser transmits the LD light source to the DMD module through an optical fiber.

[0019] As a further solution of the present invention: The image data signal is a three-dimensional model data signal, which is input into the DLP module by a computer or other device.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] 1. The system adopts a novel light source control method, that is, uses an OR gate logic module to perform logical judgment on the RGB pulse signal generated by the DLP module, and outputs a Y signal. The Y signal controls the on-off state of the pulsed laser and outputs a pulsed LD light source. The pulsed LD light source is transmitted to the DMD module and outputs an optical signal after matching with the flipping state of the DMD module. The optical signal is scanned and focused onto the liquid resin material through a galvanometer and a lens, so that it is cured. This system combines the advantages of the laser and the DLP module, and can not only achieve high-precision printing, but also improve the printing speed.

[0022] 2. The light source control method of the present invention can dynamically adjust the on-off time of the pulsed laser according to the gray scale value of the image data signal, using the data logic operation and storage functions of the OR gate logic module, so as to control the intensity and time of the optical signal, make it match the curing characteristics of the liquid resin material, reduce energy consumption and improve image contrast at the same time, and achieve high-quality 3D printing. Description of the Drawings

[0023] Figure 1 FIG. is a working flow chart of a high-precision 3D printing system based on pulsed laser control.

[0024] Figure 2 FIG. is a working flow chart of a digital micromirror device and a light source module in a high-precision 3D printing system based on pulsed laser control.

[0025] Figure 3 FIG. is a working flow chart of a lens in a high-precision 3D printing system based on pulsed laser control.

[0026] In the figure: 1. DLP module; 101. Light source module; 1011. Light emitting source; 1012. Grating; 102. Digital micromirror device; 1021. Driving circuit; 1022. Micro mirror array; 2. OR gate logic module; 3. Pulsed laser; 4. LD light source; 5. DMD module; 6. Galvanometer; 7. Lens; 8. Lens. Detailed Embodiments

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] As Figures 1 - 3 shown, a high-precision 3D printing system based on pulsed laser control includes:

[0029] The DLP module 1 is used to generate an RGB pulse signal and a DMD flip signal according to an image data signal; the image data signal is a three-dimensional model data signal, which is input into the DLP module 1 by a computer or other device.

[0030] The DLP module 1 includes a light source module 101 and a digital micromirror device 102. The light source module 101 is used to convert the image data signal into an RGB pulse signal, and the digital micromirror device 102 is used to convert the image data signal into a DMD flip signal.

[0031] The light source module 101 includes a light source 1011 and a grating 1012. The light source is used to emit white light, and the grating 1012 is used to decompose the white light into RGB primary color lights and modulate the RGB primary color lights according to the gray scale value of the image data signal, so as to generate an RGB pulse signal.

[0032] The digital micromirror device 102 includes a micromirror array 1022 and a drive circuit 1021. The micromirror array 1022 is composed of millions of flippable micromirrors, and each micromirror corresponds to a pixel point. The drive circuit 1021 is used to control the flip state of each micromirror according to the gray scale value of the image data signal, so as to generate a DMD flip signal.

[0033] The OR gate logic module 2 is used to perform a logical judgment on the RGB pulse signal generated by the DLP module 1 and output a Y signal. The Y signal is a level signal after logical judgment. When the RGB pulse signal represents a 0 gray scale, the OR gate logic module 2 outputs the Y signal as a low level, and when it is a non-0 gray scale, the OR gate logic module 2 outputs the Y signal as a high level.

[0034] The OR gate logic module 2 belongs to the creation particle function module and is used for logical operation and storage of data.

[0035] The pulsed laser 3 is used to receive the Y signal, control the switching state of the pulsed laser 3 according to the change of the Y signal, and output a pulsed LD light source 4; the Y signal is transmitted to the pulsed laser 3. When the Y signal is at a high level, the LD light source 4 of the pulsed laser 3 is turned on and outputs light intensity. When the Y signal is at a low level, the LD light source 4 of the pulsed laser 3 is turned off and there is no output.

[0036] The DMD module 5 is used to receive the DMD flip signal, and then control the micromirror array 1022 in the DMD module 5 to flip according to the gray scale value of the image data signal. The pulsed LD light source 4 is transmitted to the DMD module 5 and outputs an optical signal after matching with the flip state of the DMD module 5.

[0037] The pulsed laser 3 transmits the LD light source 4 to the DMD module 5 through an optical fiber.

[0038] The galvanometer 6 is used to receive an optical signal and then control the rotation angle of the mirror, so as to scan the optical signal to the required position; A lens 8 is also provided between the DMD module 5 and the galvanometer 6, and the lens 8 is used to converge the optical signal output by the DMD module 5 onto the galvanometer 6.

[0039] The lens 7 is used to receive an optical signal and then adjust the direction and focal length of the light, so as to focus the optical signal on the surface of the liquid resin material and cure it according to the intensity and time of the optical signal, thereby forming a 3D printed object.

[0040] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered within the protection scope of the present invention.

Claims

1. A high-precision 3D printing system based on pulsed laser control, characterized in that, Including: A DLP module for generating an RGB pulse signal and a DMD flip signal according to an image data signal; An OR gate logic module for performing a logical judgment on the RGB pulse signal generated by the DLP module and outputting a Y signal. The Y signal is a level signal after logical judgment. When the RGB pulse signal represents a 0 gray level, the OR gate logic module outputs the Y signal as a low level, and when it is a non-0 gray level, the OR gate logic module outputs the Y signal as a high level; A pulsed laser for receiving the Y signal, controlling the on / off state of the pulsed laser according to the change of the Y signal, and outputting a pulsed LD light source; A DMD module for receiving the DMD flip signal, and then controlling the micro-mirror array in the DMD module to flip according to the gray level value of the image data signal. The pulsed LD light source is transmitted to the DMD module and output as an optical signal after matching the flip state of the DMD module.

2. A high-precision 3D printing system based on pulsed laser control according to claim 1, wherein, It further includes: A galvanometer for receiving the optical signal and then controlling the rotation angle of the reflecting mirror, so as to scan the optical signal to the required position; A lens for receiving the optical signal and then adjusting the direction and focal length of the light, so as to focus the optical signal on the surface of the liquid resin material and cure it according to the intensity and time of the optical signal, thereby forming a 3D printed object.

3. A high-precision 3D printing system based on pulsed laser control according to claim 1, characterized in that The Y signal is transmitted to the pulsed laser. When the Y signal is at a high level, the LD light source of the pulsed laser is turned on and outputs light intensity. When the Y signal is at a low level, the LD light source of the pulsed laser is turned off and there is no output.

4. A high-precision 3D printing system based on pulsed laser control according to claim 1, wherein The DLP module includes a light source module and a digital micromirror device. The light source module is used to convert the image data signal into an RGB pulse signal, and the digital micromirror device is used to convert the image data signal into a DMD flip signal.

5. A high-precision 3D printing system based on pulsed laser control according to claim 4, characterized in that, The light source module includes a light source and a grating. The light source is used to emit white light, and the grating is used to decompose the white light into RGB primary color lights and modulate the RGB primary color lights according to the gray level value of the image data signal, thereby generating an RGB pulse signal.

6. The high-precision 3D printing system based on pulsed laser control according to claim 4, wherein The digital micromirror device includes a micro-mirror array and a driving circuit. The micro-mirror array is composed of millions of flippable micro-mirrors, and each micro-mirror corresponds to a pixel point. The driving circuit is used to control the flip state of each micro-mirror according to the gray level value of the image data signal, thereby generating a DMD flip signal.

7. A high-precision 3D printing system based on pulsed laser control according to claim 2, wherein, A lens is further provided between the DMD module and the galvanometer, and the lens is used to converge the optical signal output by the DMD module onto the galvanometer.

8. A high-precision 3D printing system based on pulsed laser control according to claim 1, characterized in that, The OR gate logic module belongs to the creation particle function module and is used for logical operation and storage of data.

9. A high-precision 3D printing system based on pulsed laser control according to claim 1, characterized in that, The pulsed laser transmits the LD light source to the DMD module through an optical fiber.

10. A high-precision 3D printing system based on pulsed laser control according to claim 1, characterized in that, The image data signal is a three-dimensional model data signal, which is input into the DLP module by a computer or other device.

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