A high-transmittance black and white screen 3D printer

Abstract

The present invention discloses a high-transmittance black-and-white screen 3D printer, comprising a fixed frame, a Z-axis moving mechanism, a building platform plate, and a photosensitive resin tank. The Z-axis moving mechanism and the photosensitive resin tank are respectively arranged on the fixed frame, and the bottom of the Z-axis moving mechanism is connected to the building platform plate, which is located above the photosensitive resin tank. The printer also comprises a black-and-white liquid crystal screen, an optical conversion lens, and an LED light source. The black-and-white liquid crystal screen is located below the photosensitive resin tank, and the optical conversion lens is located above the LED light source; the optical conversion lens is a hemispherical lens. The present invention uses a black-and-white liquid crystal screen for light transmission, and the optical conversion lens converts the divergent light of the LED light source into energy-integrated and relatively uniform ultraviolet light. The LED light source uses a flip-chip LED. The heat dissipation performance of the light source and the black-and-white liquid crystal screen of the entire scheme is very good, greatly improving the utilization rate of light at the same power, and can greatly improve the speed and accuracy of printing.

Description

Technical Field

[0001] The present invention relates to the field of 3D printing, and in particular to a high-transmittance black-and-white screen 3D printer. Background Art

[0002] In the existing technology, LCD 3D printers on the market primarily use a light source solution that combines a vertical chip LED light source with a reflector, and the LCD screen primarily uses an RGB color screen. The consequence of this is that after the ultraviolet light passes through the LCD screen, the central light power of the light source is high, while the peripheral light power is low. As a result, when printing models with relatively high dimensional accuracy requirements (±0.05mm), the resin absorbs different amounts of ultraviolet light energy during the curing process due to varying light power levels at different locations, resulting in large dimensional deviations. Because the reflector's function is to collect and reflect the ultraviolet light emitted by the LED light source, the light collected by the reflector is relatively messy and has stray light, making it impossible to reflect the fine details of the model.

[0003] RGB color screens have a relatively low transmittance, which blocks 90% of the purple light below the screen. This causes excessive screen heat generation and shortens the screen lifespan. Therefore, to address these shortcomings, a high-transmittance black and white screen and its corresponding light source assembly are needed. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a high-transmittance black-and-white screen 3D printer, in which light can be directly and evenly irradiated onto the black-and-white screen, and the utilization rate of light can be improved under the same power. The transmittance of purple light is 3 to 4 times higher than that of RGB color screen under the same conditions, and the printing efficiency and printing precision are high, and the heat dissipation effect during the printing process is very good.

[0005] The technical solution of the present invention is as follows: A high-transmittance black-and-white screen 3D printer includes a fixed frame, a Z-axis moving mechanism, a building platform plate, and a photosensitive resin tank. The Z-axis moving mechanism and the photosensitive resin tank are respectively arranged on the fixed frame. The bottom of the Z-axis moving mechanism is connected to the building platform plate, and the building platform plate is located above the photosensitive resin tank. It also includes a black-and-white LCD screen, an optical conversion lens, and an LED light source. The black-and-white LCD screen is arranged below the photosensitive resin tank, and the optical conversion lens is arranged above the LED light source.

[0006] Wherein, the optical conversion lens is a hemispherical lens.

[0007] By adopting the above-mentioned technical solutions, in the high-transmittance black-and-white screen 3D printer, a lens base is provided at the bottom of the hemispherical lens, the lens base is hollow, and the lens base is located on the LED light source.

[0008] By adopting the above-mentioned technical solutions, in the high-transmittance black-and-white screen 3D printer, the LED light source is a flip-chip LED.

[0009] By adopting the above-mentioned technical solutions, the high-transmittance black-and-white screen 3D printer further includes a light shield, the black-and-white LCD screen is located on the top of the light shield, and the optical conversion lens and LED light source are located in the light shield.

[0010] Utilizing the aforementioned technical solutions, the present invention utilizes a black and white LCD screen for light transmission. An optical conversion lens converts the divergent light from the LED light source into energy-integrated and relatively uniform ultraviolet light. The LED light source utilizes a flip-chip LED. The overall solution boasts excellent heat dissipation performance for both the light source and the black and white LCD screen. No reflective cover is required to collect light, significantly improving light utilization at the same power. The exposure time for a single layer of a black and white LCD screen is 3-4 times that of an RGB color screen. Printing the same model using this solution can save 3-4 times the time, significantly increasing printing speed and accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0012] Figure 2 It is a longitudinal sectional schematic diagram of the present invention;

[0013] Figure 3 Schematic diagram of the light source assembly of the present invention. DETAILED DESCRIPTION

[0014] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0015] like Figures 1 to 3 This embodiment provides a high-transmittance black-and-white screen 3D printer, comprising a fixed frame, a Z-axis motion mechanism, a build platform, a photosensitive resin tank, a black-and-white liquid crystal display, an optical conversion lens, and an LED light source. The Z-axis motion mechanism and the photosensitive resin tank are respectively mounted on the fixed frame. The bottom of the Z-axis motion mechanism is connected to the build platform, which is located above the photosensitive resin tank. The black-and-white liquid crystal display is located below the photosensitive resin tank, and the optical conversion lens is located above the LED light source.

[0016] The optical conversion lens is a hemispherical lens with a hollow lens base at the bottom. The lens base is located on the LED light source. When the LED light source emits light, the hemispherical lens can convert the tilted light emitted by the LED light source into energy-integrated and relatively uniform ultraviolet light.

[0017] The energy-integrated and relatively uniform ultraviolet light then passes through the black and white LCD screen, which has high light transmittance. Of course, the high light transmittance referred to in this embodiment refers to the transmittance of purple light. There is no color filter in each pixel of the black and white LCD screen, allowing purple light to pass directly through. Compared with the conventional RGB color screen, the black and white LCD screen in this embodiment has a purple light transmittance that is 3 to 4 times higher than that of the RGB color screen under the same conditions. At the same time, the heat generated by the black and white LCD screen will be greatly reduced, extending its service life. The power of the entire machine will also be reduced. Under the same solution, the power of the entire machine can be reduced by 1 / 3 compared with the RGB color screen.

[0018] Traditional solutions utilize upright-chip LEDs, while the LED light source in this embodiment utilizes flip-chip LEDs. Flip-chip LEDs offer significant advantages in 3D printing: they allow for denser placement of chips. For the same size, flip-chip LEDs can accommodate more chips, achieving the goal of high current and concentrated light in a compact form factor. Furthermore, flip-chip LEDs, because they directly contact the substrate, offer improved heat dissipation, eliminating the need for heat sinks and fans. This significantly reduces costs and improves assembly efficiency in 3D printing.

[0019] like Figure 2 In this embodiment, a light shield is further provided, the black and white LCD screen is located on top of the light shield, and the optical conversion lens and LED light source are located inside the light shield. The light shield can block and absorb excess ultraviolet light to prevent light from irradiating outside.

[0020] like Figure 1 and Figure 2 , the specific working process of 3D printing is as follows:

[0021] 1. The LED light source emits ultraviolet light of a specific wavelength at a certain angle, which is evenly irradiated onto the black and white LCD screen through the conversion of the optical conversion lens.

[0022] 2. The optically converted ultraviolet light passes through the black and white LCD screen.

[0023] 3. There is a photosensitive resin tank above the black and white LCD screen, and liquid photosensitive resin is filled in the photosensitive resin tank.

[0024] 4. Under the control of the driver board, the black and white LCD screen displays the required pattern.

[0025] 5. The pattern displayed on the black and white LCD screen is irradiated by optically converted ultraviolet light, and a curing reaction occurs through the black and white LCD screen and the photosensitive resin in the material tank.

[0026] 6. The resin above the non-display area of ​​the black and white LCD screen is in liquid form, while the solidified resin is on the build platform.

[0027] 7. The black and white LCD screen continuously displays the required shape under the action of the driver board. At the same time, the Z axis moves up and down, driving the build platform to move up and down, so that the resin solidifies layer by layer on the build platform, and the required three-dimensional product is printed over and over again.

[0028] Utilizing the aforementioned technical solutions, the present invention utilizes a black and white LCD screen for light transmission. An optical conversion lens converts the divergent light from the LED light source into energy-integrated and relatively uniform ultraviolet light. The LED light source utilizes a flip-chip LED. The overall solution boasts excellent heat dissipation performance for both the light source and the black and white LCD screen. No reflective cover is required to collect light, significantly improving light utilization at the same power. The exposure time for a single layer of a black and white LCD screen is 3-4 times that of an RGB color screen. Printing the same model using this solution can save 3-4 times the time, significantly increasing printing speed and accuracy.

[0029] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A high-transmittance black-and-white screen 3D printer, comprising a fixed frame, a Z-axis moving mechanism, a build platform, and a photosensitive resin tank, wherein the Z-axis moving mechanism and the photosensitive resin tank are respectively arranged on the fixed frame, the bottom of the Z-axis moving mechanism is connected to the build platform, and the build platform is located above the photosensitive resin tank, characterized in that: It also includes a black and white liquid crystal screen, an optical conversion lens, and an LED light source, wherein the black and white liquid crystal screen is arranged below the photosensitive resin tank, and the optical conversion lens is arranged above the LED light source; Among them, the optical conversion lens is a hemispherical lens; the LED light source is a densely arranged flip-chip LED; the hemispherical lens converts the inclined light emitted by the LED light source into energy-integrated and uniform ultraviolet light; the flip-chip is in direct contact with the substrate, has good heat dissipation performance, and in 3D printing, no heat sink and cooling fan are required.

2. The high-transmittance black and white screen 3D printer according to claim 1, characterized in that: A lens base is provided at the bottom of the hemispherical lens. The lens base is hollow and is located on the LED light source.

3. The high-transmittance black and white screen 3D printer according to claim 1, characterized in that: It also includes a light shield, the black and white liquid crystal screen is located on the top of the light shield, and the optical conversion lens and the LED light source are located in the light shield.

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