Microsystem for LCD photocuring 3D printing device and method for micro-nano 3D printing

Abstract

The application discloses a microsystem for an LCD light-curing 3D printing device and a micro-nano 3D printing method, wherein light rays converged by a converging lens group are micro-imaged on a printing forming area of the 3D printing device through a micro-lens group, micro-nano 3D printing is realized, the cost is effectively reduced, and the service life of the LCD screen is effectively prolonged because the LCD screen does not bear external force during general 3D printing.

Description

[Technical Field]

[0001] This invention relates to a miniaturization system for LCD photopolymerization 3D printing apparatus and a method for micro / nano 3D printing. [Background Technology]

[0002] Additive manufacturing LCD photopolymerization 3D printers offer advantages such as high resolution and low cost. The structure and resolution of the LCD itself, as the light modulation medium, determine the final precision of the 3D printed product.

[0003] However, the pixels of the currently used monochrome LCD screens are relatively large, generally greater than 10um, making them difficult to use for precision micro-nano 3D printing. In addition, the light efficiency of monochrome LCD screens is very low, which is due to the direct origin of the color screen process, resulting in most areas being opaque. These opaque parts prevent the photocurable adhesive from being fully exposed and cured, and also make them unsuitable for many materials, with insufficient adhesion and low yield.

[0004] For example, Figure 7 This is a schematic diagram illustrating the display principle of a monochrome LCD pixel. To reduce costs, the original red, green, and blue pixels have been reduced to a single light-transmitting pixel. From Figure 8 As can be seen, the pixel opening areas 11 are not tightly arranged; there are gaps between the pixels. In a monochrome LCD screen, most of the pixels are opaque, and these opaque areas prevent the photocurable adhesive from being fully exposed and cured, resulting in low yield and making it impossible to print on some materials.

[0005] Therefore, this invention addresses the aforementioned problems. [Summary of the Invention]

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a miniaturization system and a micro-nano 3D printing method for LCD photopolymerization 3D printing devices. By using a miniaturized lens group to miniaturize the light converged by the converging lens group and image it onto the printing area of ​​the 3D printing device, micro-nano-level 3D printing is achieved, effectively reducing costs. At the same time, since the LCD screen does not bear the external force of general 3D printing, the lifespan of the LCD screen is effectively extended.

[0007] This invention is achieved through the following technical solution:

[0008] The miniaturization system for LCD photopolymerization 3D printing device includes a light source, an LCD screen 1, a converging lens group 2, and a miniaturization lens group 3 arranged sequentially along the light emission path;

[0009] The light source is used to emit light that provides exposure energy for the photocurable material;

[0010] The LCD screen 1 is used to receive light emitted from a light source and control the light to pass through in pixels to form an image;

[0011] The converging lens group 2 is used to change the direction of the light rays emitted by the LCD screen 1 and converges the changed light rays to the micro-lens group 3.

[0012] The micro-lens group 3 is used to micro the light rays converged by the converging lens group 2 and image the microed light rays to the printing forming area of the 3D printing device.

[0013] The micro system for the LCD photocuring 3D printing device as described above, the micro-lens group 3 comprises a micro-lens 31 and a collimating lens 32; the micro-lens 31 is used to micro the light rays converged by the converging lens group 2 and emit the microed light rays to the collimating lens 32; the collimating lens 32 is used to collimate the chief rays microed by the micro-lens 31 into parallel light and image the display image of the LCD screen 1 to the printing forming area of the 3D printing device.

[0014] The micro system for the LCD photocuring 3D printing device as described above, the converging lens group 2 is a glass lens or a Frensel lens.

[0015] The micro system for the LCD photocuring 3D printing device as described above, further comprises a first moving adjusting mechanism used to drive the relative movement of the LCD screen 1 or the micro-lens group 3 so that the image of the printing forming area of the 3D printing device moves to the corresponding position.

[0016] The micro system for the LCD photocuring 3D printing device as described above, further comprises a flat glass 4 which can be adjusted to rotate around the X axis and / or the Y axis, the flat glass 4 is located between the micro-lens group 3 and the printing forming area of the 3D printing device, the flat glass 4 is used to receive the light rays microed by the micro-lens group 3 and make the chief rays produce displacement due to refraction and then emit to the printing forming area of the 3D printing device, the image displacement distance of the flat glass 4 is:

[0017]

[0018] Wherein, h is the thickness of the glass, θ is the rotation angle, and n is the refractive index of the glass.

[0019] The micro system for the LCD photocuring 3D printing device as described above, further comprises a flat glass 4 which can be adjusted to rotate around the X axis and / or the Y axis, the flat glass 4 is located between the LCD screen 1 and the converging lens group 2, the flat glass 4 is used to receive the light rays emitted by the LCD screen 1 and make the light rays produce refraction translation and then emit to the converging lens group 2.

[0020] The micro system for the LCD photocuring 3D printing device, the LCD screen 1, the converging lens group 2 and the micro lens group 3 are relatively fixedly arranged, and the second movement adjusting mechanism for driving the LCD screen 1, the converging lens group 2 and the micro lens group 3 to move correspondingly to realize the graphic splicing exposure is further arranged.

[0021] The application further provides a method for micro-nano 3D printing by using the LCD screen, which comprises the following steps:

[0022] The light source emits light, the light is irradiated on the converging lens group 2 after passing through the LCD screen 1, then the converging lens group 2 converges the light passing through the LCD screen 1 on the micro lens group 3, and then the micro lens group 3 converges the light converged by the converging lens group 2 and forms an image on the printing forming area of the 3D printing device.

[0023] Compared with the prior art, the application has the following advantages:

[0024] 1. The micro lens group converges the light converged by the converging lens group and forms an image on the printing forming area of the 3D printing device, so that the micro-nano 3D printing is realized, the cost is effectively reduced, and the service life of the LCD screen is effectively prolonged because the LCD screen does not bear the external force during general 3D printing.

[0025] 2. The first movement adjusting mechanism drives the relative movement of the LCD screen or the micro lens group, so that the image on the printing forming area of the 3D printing device is moved to the corresponding position for re-exposure, the non-transparent area is completely filled, the whole area is exposed, the image on the LCD screen is changed, and the precision and fineness of the 3D printing product are enhanced.

[0026] 3. The flat glass receives the light converged by the micro lens group and makes the main light ray displace due to refraction and then exit on the printing forming area of the 3D printing device, so that the position of the exposure point is changed, the resolution is expanded, the solidified material is uniformly and completely solidified, and the printing quality is improved.

[0027] 4. The second movement adjusting mechanism drives the relative movement of the LCD screen, the converging lens group and the micro lens group to realize the graphic splicing exposure, so that the large-size micro-nano 3D printing is realized.

DRAWINGS

[0028] The specific embodiments of the application will be further described in detail below with reference to the drawings, in which:

[0029] Figure 1 It is a structural schematic diagram of the embodiment 1 of the application.

[0030] Figure 2This is a schematic diagram of the pixel array in Embodiment 1 of the present invention.

[0031] Figure 3 This is a schematic diagram of the structure of Embodiment 2 of the present invention.

[0032] Figure 4 This is a schematic diagram of the structure of Embodiment 3 of the present invention.

[0033] Figure 5 This is a schematic diagram of the structure of Embodiment 4 of the present invention.

[0034] Figure 6 This is a schematic diagram illustrating the display principle of a single pixel in a color LCD screen.

[0035] Figure 7 This is one of the schematic diagrams illustrating the display principle of a monochrome LCD pixel.

[0036] Figure 8 This is the second schematic diagram illustrating the display principle of a monochrome LCD pixel.

Detailed Implementation Methods

[0037] The following is in conjunction with the appendix Figures 1-8 The embodiments of the present invention will be described in detail.

[0038] like Figures 1-5 As shown, the miniaturization system for the LCD photopolymerization 3D printing device of the present invention includes a light source, an LCD screen 1, a converging lens group 2, and a miniaturization lens group 3 arranged sequentially along the light emission path;

[0039] The light source is used to emit light that provides exposure energy for the photocurable material;

[0040] The LCD screen 1 is used to receive light emitted from a light source and control the light to pass through in pixels to form an image;

[0041] The converging lens group 2 is used to change the direction of the light emitted from the LCD screen 1 and converge the changed light onto the microlens group 3;

[0042] The microlens group 3 is used to miniaturize the light rays converged by the converging lens group 2 and image them onto the printing area of ​​the 3D printing device. This invention achieves micro-nano-level 3D printing by miniaturizing the light rays converged by the converging lens group and image them onto the printing area of ​​the 3D printing device, effectively reducing costs. Furthermore, since the LCD screen does not bear the external forces typical of 3D printing, it effectively extends the lifespan of the LCD screen.

[0043] like Figure 1 , 3 As shown in Figure -5, the principal ray incident on LCD screen 1 is a parallel ray.

[0044] In this invention, the light-emitting optical path is arranged coaxially or parallel to the Z-axis. The LCD screen 1, the converging lens group 2, and the microlens group 3 are all parallel to each other and perpendicular to the Z-axis. Figure 1 , 3 As shown in -5.

[0045] like Figure 1 , 3 As shown in Figure 5, the microlens group 3 includes a microlens 31 and a collimating lens 32; the microlens 31 is used to shrink the light rays converged by the converging lens group 2 and then emit them through the collimating lens 32; the collimating lens 32 is used to collimate the principal light rays shrunk by the microlens 31 into parallel light and then image the display pattern of the LCD screen 1 onto the printing area of ​​the 3D printing device.

[0046] Preferably, in order to improve the converging effect, the converging lens group 2 is a glass lens or a Fresnel lens.

[0047] It also includes a first movement adjustment mechanism for driving the LCD screen 1 or the microlens group 3 to move relative to each other so that the image in the printing area of ​​the 3D printing device is moved to a corresponding position. In this embodiment, the first movement adjustment mechanism is configured to drive the LCD screen 1 or the microlens group 3 to move accordingly along the X-axis or Y-axis direction, thereby moving the image in the printing area of ​​the 3D printing device to the corresponding position for re-exposure, thereby completely filling the opaque area and ensuring that the entire area is fully exposed, such as... Figure 2 As shown, this alters the image on the LCD screen, enhancing the precision and detail of 3D printed products.

[0048] like Figure 2 As shown, its original pixels are 100 and 200. These two pixels are moved 5 times in the X-axis direction and 1 time in the Y-axis direction, so that the entire area is fully exposed.

[0049] like Figure 3 As shown, it also includes a flat glass 4 that can be rotated and adjusted around the X-axis and / or Y-axis. The flat glass 4 is located between the microlens group 3 and the printing area of ​​the 3D printing device. The flat glass 4 is used to receive light after it has been miniaturized by the microlens group 3 and to cause the main light beam to be displaced due to refraction before exiting into the printing area of ​​the 3D printing device, thereby changing the position of the exposure point, achieving expanded resolution and uniform and complete curing of the curing material, and improving printing quality. In this embodiment, the incident and outgoing light rays in the flat glass 4 have the same direction, such as... Figure 3 As shown, all are parallel light rays. The distance of the displacement in the above image is:

[0050]

[0051] Wherein, h is the thickness of the glass, θ is the rotation angle, and n is the refractive index of the glass.

[0052] As shown in Figure 4 Also includes a flat glass 4 that can be adjusted around the X axis and / or Y axis, which is located between the LCD screen 1 and the converging lens group 2, and is used to receive the light emitted by the LCD screen 1 and refract the light to be emitted to the converging lens group 2, and when the flat glass 4 rotates, the light is translated to offset the image position of the pixel point. Figure 4 As shown in

[0053] As shown in Figure 5 The LCD screen 1, the converging lens group 2, and the micro-lens group 3 are relatively fixed, and a second movement adjusting mechanism is further included for driving the LCD screen 1, the converging lens group 2, and the micro-lens group 3 to move correspondingly to achieve pattern splicing exposure.

[0054] The present application uses the gap between the pixels, changes the position of the pixels on the light-cured material to make the material fully cured, and changes the pattern of the LCD screen when changing the position of the light spot, thereby expanding the LCD resolution by several times.

[0055] The present application does not change the original resolution of the LCD screen, changes the image position through the movement of the light path mechanism, achieves the effect of improving the resolution of the LCD light-cured 3D printer by several times, and can perform large-size 3D micro-nano printing, while increasing the fullness and density of the exposure area and improving the printing yield.

[0056] Figure 7 It is a schematic diagram of the display principle of a single pixel of a color liquid crystal screen, including three pixel opening areas 11, usually red, green and blue, to generate a single color pixel image.

[0057] The present application is a method for LCD screen micro-nano 3D printing, using the micro-lens system of the LCD light-cured 3D printing device as described above, the method comprising the following steps:

[0058] The light source emits light, which is irradiated on the converging lens group 2 after passing through the LCD screen 1, and then the converging lens group 2 converges the light passing through the LCD screen 1 on the micro-lens group 3, and then the micro-lens group 3 micro-lenses the light converged by the converging lens group 2 and images on the printing forming area of the 3D printing device, which can realize micro-nano 3D printing, effectively reduce the cost, and improve the printing yield.

Claims

1. A micro system for an LCD photocuring 3D printing device, characterized by It comprises a light source, an LCD screen (1), a converging lens group (2), a micro-lens group (3) arranged in sequence along the light emitting path. The light source is used to emit light to provide exposure energy for the light-cured material. The LCD screen (1) is used to receive the light emitted by the light source and control the light passing through to form an image according to pixels. The converging lens group (2) is a glass lens or a Feni lens, which is used to change the direction of the light emitted by the LCD screen (1) and converge the changed light to the micro-lens group (3). The micro-lens group (3) is used to micro the light converged by the converging lens group (2) and image it on the printing forming area of the 3D printing device. The micro-lens group (3) comprises a micro-lens (31) and a collimating lens (32). The micro-lens (31) is used to micro the light converged by the converging lens group (2) and emit it to the collimating lens (32). The collimating lens (32) is used to collimate the chief ray micro by the micro-lens (31) into parallel light and image the display image of the LCD screen (1) on the printing forming area of the 3D printing device.

2. The micro system for the LCD photo-curing 3D printing device according to claim 1, wherein It also comprises a first movement adjusting mechanism for driving the relative movement of the LCD screen (1) or the micro-lens group (3) to move the image on the printing forming area of the 3D printing device to the corresponding position.

3. The micro system for the LCD photocuring 3D printing device according to claim 1 or 2, characterized in that It also comprises a flat glass (4) which can be adjusted to rotate around the X axis and / or the Y axis, the flat glass (4) is located between the micro-lens group (3) and the printing forming area of the 3D printing device, and the flat glass (4) is used to receive the light micro by the micro-lens group (3) and emit it to the printing forming area of the 3D printing device after the displacement caused by refraction.

4. The micro system for the LCD photo-curing 3D printing device according to claim 1 or 2, wherein It also comprises a flat glass (4) which can be adjusted to rotate around the X axis and / or the Y axis, the flat glass (4) is located between the LCD screen (1) and the converging lens group (2), and the flat glass (4) is used to receive the light emitted by the LCD screen (1) and emit it to the converging lens group (2) after the refraction translation.

5. The micro system for the LCD photo-curing 3D printing device according to claim 1 or 2, wherein The LCD screen (1), the converging lens group (2) and the micro-lens group (3) are fixedly arranged, and the second movement adjusting mechanism is used to drive the corresponding movement of the LCD screen (1), the converging lens group (2) and the micro-lens group (3) to realize the image splicing exposure.

6. A method for micro-nano 3D printing of an LCD screen using a micro system for an LCD photocuring 3D printing device according to any one of claims 1-5, characterized in that The method comprises the following steps: The light source emits light, the light passes through the LCD screen (1) and irradiates the converging lens group (2), then the converging lens group (2) converges the light passing through the LCD screen (1) to the micro-lens group (3), and then the micro-lens group (3) micro the light converged by the converging lens group (2) and image it on the printing forming area of the 3D printing device.

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