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

Abstract

According to the micro system for the LCD photocuring 3D printing device and the micro-nano 3D printing method, light converged by the converging lens group is micro through the micro lens group and is imaged in the printing forming area of the 3D printing device, micro-nano 3D printing is achieved, the cost is effectively reduced, meanwhile, due to the fact that an LCD screen does not bear external force during common 3D printing, the 3D printing effect is good, and the 3D printing effect is good. And the service life of the LCD screen is effectively prolonged.

Description

[Technical field]

[0001] The invention relates to a micro-shrinkage system for an LCD light-curing 3D printing device and a micro-nano 3D printing method. [Background technology]

[0002] Additive manufacturing LCD light-curing 3D printer has the advantages of high resolution and low cost. LCD is a light modulation medium, and the structure and resolution of the hardware itself also determine the accuracy of the final 3D printing.

[0003] However, the pixels of the black and white LCD screens currently in use are relatively large, generally larger than 10um, which makes them difficult to use for precision micro-nano 3D printing; in addition, the light efficiency of black and white LCD screens is very low, the reason for which is directly derived from the color screen process, which makes most areas opaque. These opaque parts result in the photocuring adhesive not being able to be fully exposed and cured, and at the same time make it unsuitable for many materials, with insufficient adhesion and low yield.

[0004] For example, Figure 7 This is a schematic diagram of the display principle of a monochrome LCD pixel. To reduce costs, the original red, green, and blue pixels are simply reduced to one light-transmitting pixel. Figure 8 It can be seen that the pixel opening areas 11 are not closely arranged together, and there are gaps between pixels. Most of the black and white LCD screen is opaque, and these opaque parts cause the photocurable adhesive to be unable to be fully exposed and cured, resulting in low yield and complete inability to print on some materials.

[0005] Therefore, the present invention is studied and proposed in view of the above problems. [Summary of the invention]

[0006] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a micronization system for an LCD light-curing 3D printing device and a micro-nano 3D printing method. The light converged by the converging lens group is miniaturized by a micronized lens group and imaged on a printing and forming area of ​​the 3D printing device, thereby realizing micro-nano 3D printing and effectively reducing costs. At the same time, since the LCD screen does not bear the external force during general 3D printing, the life of the LCD screen is effectively extended.

[0007] The present invention is achieved through the following technical solutions:

[0008] A microfilm system for an LCD light-curing 3D printing device includes a light source, an LCD screen 1, a converging lens group 2, and a microfilm lens group 3 arranged in sequence along a light emission optical 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 by the light source and control the light to form an image by pixel;

[0011] The converging lens group 2 is used to change the direction of the light emitted by the LCD screen 1 and converge the changed light to the microlens group 3;

[0012] The micro-lens group 3 is used to micro-scale the light converged by the converging lens group 2 and form an image on the printing and forming area of ​​the 3D printing device.

[0013] As described above, in the micro-system for LCD light-curing 3D printing device, the micro-lens group 3 includes a micro-lens 31 and a collimating lens 32; the micro-lens 31 is used to micro-scale 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 main light micro-scaled by the micro-lens 31 into parallel light and image the display pattern of the LCD screen 1 on the printing molding area of ​​the 3D printing device.

[0014] In the micro-system for LCD light-curing 3D printing device as described above, the converging lens group 2 is a glass lens or a Fresnel lens.

[0015] As described above, the microfilm system for LCD light-curing 3D printing device also includes a first moving adjustment mechanism for driving the LCD screen 1 or the microfilm lens group 3 to move relatively so that the image in the printing area of ​​the 3D printing device moves to a corresponding position.

[0016] The microfilm system for LCD light-curing 3D printing device as described above further includes a flat glass 4 that can be rotated and adjusted around the X-axis and / or the Y-axis. The flat glass 4 is located between the microfilm lens group 3 and the printing and forming area of ​​the 3D printing device. The flat glass 4 is used to receive the light after being microfilmed by the microfilm lens group 3 and to make the main light be displaced due to refraction and then emitted to the printing and forming area of ​​the 3D printing device. The image displacement distance is:

[0017]

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

[0019] The microfilm system for LCD photocuring 3D printing device as described above also includes a flat glass 4 that can be rotated and adjusted 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 emitted by the LCD screen 1 and refract and translate the light before emitting from the converging lens group 2.

[0020] As described above, the microfilm system for LCD light-curing 3D printing device, wherein the LCD screen 1, the converging lens group 2, and the microfilm lens group 3 are relatively fixedly arranged, also includes a second moving adjustment mechanism for driving the LCD screen 1, the converging lens group 2, and the microfilm lens group 3 to move accordingly to achieve graphic splicing exposure.

[0021] The present invention also provides a method for performing micro-nano 3D printing on an LCD screen, using the micro-printing system for the LCD light-curing 3D printing device as described above, the method comprising the following steps:

[0022] The light source is controlled to emit light, and the light passes through the LCD screen 1 and then irradiates the converging lens group 2. Then the converging lens group 2 converges the light passing through the LCD screen 1 to the microlens group 3. Then the microlens group 3 micronizes the light converged by the converging lens group 2 and forms an image on the printing molding area of ​​the 3D printing device.

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

[0024] 1. The present invention uses a micro-lens group to miniaturize the light converged by the converging lens group and image it on the printing and molding area of ​​the 3D printing device, thereby realizing micro-nano level 3D printing and effectively reducing costs. At the same time, since the LCD screen does not bear the external force during general 3D printing, the life of the LCD screen is effectively extended.

[0025] 2. The present invention drives the LCD screen or the microlens group to move relatively through the first moving adjustment mechanism so that the image in the printing molding area of ​​the 3D printing device is moved to the corresponding position for re-exposure, thereby completely filling the opaque area, so that the entire area is completely exposed, and then the image on the LCD screen is changed, thereby enhancing the accuracy and fineness of the 3D printed product.

[0026] 3. The present invention receives the light after being miniaturized by the micro-lens group through the flat glass and makes the main light be displaced due to refraction and then emitted to the printing and molding area of ​​the 3D printing device, thereby changing the position of the exposure point, achieving the expansion of the resolution and the uniform and complete curing of the curing material, and improving the printing quality.

[0027] 4. The present invention drives the LCD screen, the converging lens group, and the micro-lens group to move accordingly through the second moving adjustment mechanism to achieve graphic splicing exposure, thereby realizing large-scale micro-nano 3D printing.

Brief Description of the Drawings

[0028] The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings, wherein:

[0029] Figure 1 This is a schematic diagram of the structure of Example 1 of the present invention.

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

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

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

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

[0034] Figure 6 Schematic diagram of the display principle of a single pixel of a color LCD screen.

[0035] Figure 7 One of the schematic diagrams of the display principle of a monochrome LCD pixel.

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

[0037] The following is combined with Figure 1-8 Embodiments of the present invention are described in detail.

[0038] like Figure 1-5 As shown, the micro-printing system for LCD light-curing 3D printing device of the present invention comprises a light source, an LCD screen 1, a converging lens group 2, and a micro-printing lens group 3 arranged in sequence along the light emission optical 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 by the light source and control the light to form an image by pixel;

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

[0042] The micro-lens group 3 is used to miniaturize the light converged by the converging lens group 2 and image it in the printing and forming area of ​​the 3D printing device. The present invention uses the micro-lens group to miniaturize the light converged by the converging lens group and image it in the printing and forming area of ​​the 3D printing device, thereby realizing micro-nano-level 3D printing, effectively reducing costs, and at the same time, because the LCD screen does not bear the external force during general 3D printing, the life of the LCD screen is effectively extended.

[0043] like Figure 1 , 3 -5, the main light incident on the LCD screen 1 is a parallel light.

[0044] In the present invention, the light emission path is coaxial or parallel to the Z axis, and 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 -5.

[0045] like Figure 1 , 3 -5, the microlens group 3 includes a microlens 31 and a collimating lens 32; the microlens 31 is used to micron the light converged by the converging lens group 2 and then emit it to the collimating lens 32; the collimating lens 32 is used to collimate the main light miniaturized by the microlens 31 into parallel light and then image the display pattern of the LCD screen 1 on the printing molding area of ​​the 3D printing device.

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

[0047] It also includes a first moving adjustment mechanism for driving the LCD screen 1 or the microlens group 3 to move relatively so that the image in the printing area of ​​the 3D printing device moves to a corresponding position. In this embodiment, the first moving 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, so that the image in the printing area of ​​the 3D printing device moves to a corresponding position for re-exposure, thereby completely filling the opaque area, so that the entire area is completely exposed. Figure 2 As shown, the image on the LCD screen is changed to enhance the accuracy and fineness of the 3D printed product.

[0048] like Figure 2 As shown, the original pixels are 100 and 200. These two pixels move 5 times in the X-axis direction and 1 time in the Y-axis direction, so that the entire area is completely 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 and forming area of ​​the 3D printing device. The flat glass 4 is used to receive the light after being micronized by the microlens group 3 and make the main light emerge from the printing and forming area of ​​the 3D printing device after being displaced due to refraction, thereby changing the position of the exposure point, achieving the expansion of the resolution and the uniform and complete curing of the curing material, and improving the printing quality. In this embodiment, the directions of the incident light and the outgoing light in the flat glass 4 are the same, as shown in FIG. Figure 3 As shown, all are parallel rays. The displacement distance of the above image is:

[0050]

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

[0052] like Figure 4 As shown, it also includes a flat glass 4 that can be rotated and adjusted 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 emitted by the LCD screen 1 and refract and translate the light before emitting it from the converging lens group 2. When the flat glass 4 rotates, the light translates to achieve the offset of the pixel image position. In this embodiment, the directions of the incident light and the outgoing light in the flat glass 4 are the same, as shown in FIG. Figure 4 As shown, all rays are parallel.

[0053] like Figure 5 As shown, the LCD screen 1, the converging lens group 2, and the micro-lens group 3 are relatively fixedly arranged, and also include a second moving adjustment mechanism for driving the LCD screen 1, the converging lens group 2, and the micro-lens group 3 to move accordingly to achieve pattern splicing exposure. The second moving adjustment mechanism includes but is not limited to a driving screw nut mechanism for driving the micro-system 5 to move in a large range in the X and Y directions to achieve pattern splicing exposure.

[0054] The present invention utilizes the gaps between pixels and changes the positions of pixels on the photocurable material to fully cure the material. Meanwhile, the pattern of the LCD screen is also changed when the position of the light spot is changed, thereby doubling the LCD resolution.

[0055] Without changing the native resolution of the LCD screen, the present invention changes the image position by moving the optical path mechanism to achieve the effect of doubling the resolution of the LCD light-curing 3D printer and can perform large-size 3D micro-nano printing, while increasing the sufficiency 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, which are usually red, green and blue, respectively, so as to generate an image of a single color pixel.

[0057] The present invention provides a method for performing micro-nano 3D printing on an LCD screen, using the micro-printing system for the LCD light-curing 3D printing device as described above, and the method comprises the following steps:

[0058] The light source is controlled to emit light, and the light passes through the LCD screen 1 and then irradiates the converging lens group 2. Then the converging lens group 2 converges the light passing through the LCD screen 1 to the microlens group 3. Thereafter, the microlens group 3 miniaturizes the light converged by the converging lens group 2 and images it on the printing molding area of ​​the 3D printing device, thereby realizing micro-nano level 3D printing, effectively reducing costs and improving printing yield.

Claims

1. A micro-printing system for LCD light-curing 3D printing device, characterized in that The invention comprises a light source, an LCD screen (1), a convergent lens group (2), and a micro-lens group (3) which are arranged in sequence along a light emission optical path; The light source is used to emit light that provides exposure energy for the photocurable material; The LCD screen (1) is used to receive light emitted by a light source and control the light to form an image by pixel; The converging lens group (2) is a glass lens or a Fresnel lens, and is used to change the direction of light emitted from the LCD screen (1) and converge the changed light to the microlens group (3); The micro-lens group (3) is used to micro-scale the light converged by the convergent lens group (2) and to form an image on a printing and forming area of ​​the 3D printing device.

2. According to claim 1, the micro-printing system for LCD light-curing 3D printing device is characterized in that The microlens group (3) comprises a microlens (31) and a collimating lens (32); The micro-lens (31) is used to micro-scale the light rays converged by the convergent lens group (2) and emit the micro-lens to the collimating lens (32); The collimating lens (32) is used to collimate the main light micronized by the microlens (31) into parallel light and then image the display pattern of the LCD screen (1) on the printing and forming area of ​​the 3D printing device.

3. The microfilm system for LCD light-curing 3D printing device according to claim 1, characterized in that It also includes a first moving adjustment mechanism for driving the LCD screen (1) or the microlens group (3) to move relatively so that the image in the printing area of ​​the 3D printing device moves to a corresponding position.

4. The microfilm system for LCD light-curing 3D printing device according to claim 1 or 2, characterized in that It also includes a flat glass (4) that can be rotated and adjusted around the X-axis and / or the Y-axis. The flat glass (4) is located between the micro-lens group (3) and the printing and forming area of ​​the 3D printing device. The flat glass (4) is used to receive the light that has been micronized by the micro-lens group (3) and to make the main light be displaced due to refraction and then emitted to the printing and forming area of ​​the 3D printing device.

5. The microfilm system for LCD light-curing 3D printing device according to claim 1 or 2, characterized in that It also comprises a flat glass (4) that can be rotated and adjusted 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 light emitted from the LCD screen (1) and refract and translate the light before emitting from the converging lens group (2).

6. The microfilm system for LCD light-curing 3D printing device according to claim 1 or 2, characterized in that The LCD screen (1), the converging lens group (2), and the micro-lens group (3) are relatively fixedly arranged, and also include a second moving adjustment mechanism for driving the LCD screen (1), the converging lens group (2), and the micro-lens group (3) to move accordingly to achieve pattern splicing exposure.

7. A method for micro-nano 3D printing of an LCD screen, using the micro-system for LCD light-curing 3D printing device as claimed in any one of claims 1 to 6, characterized in that The method comprises the following steps: The light source is controlled to emit light, and the light passes through the LCD screen (1) and then 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). Then, the micro-lens group (3) micro-scales the light converged by the converging lens group (2) and forms an image on the printing molding area of ​​the 3D printing device.

Images