CN111531877A - High printing opacity black and white screen 3D printer - Google Patents

Abstract

The invention discloses a high-light-transmitting black-and-white screen 3D printer, comprising a fixed frame, a Z-axis moving mechanism, a construction 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 Z-axis moving mechanism The bottom is connected to the building platform plate, the building platform plate is located above the photosensitive resin tank, and also includes a black and white liquid crystal screen, an optical conversion lens, and an LED light source. is a hemispherical lens. The invention adopts the black and white liquid crystal screen to transmit light, and converts the divergent light of the LED light source into the energy-integrated and relatively uniform ultraviolet light through the optical conversion lens. The LED light source adopts the flip-chip LED. Very good, under the same power, the utilization rate of light is greatly improved, and the speed and accuracy of printing can be greatly improved.

Description

A high light transmission black and white screen 3D printer

technical field

The invention relates to the field of 3D printing, in particular to a 3D printer with a high light transmission black and white screen.

Background technique

In the prior art, LCD 3D printers on the market mainly use the light source solution of vertical chip LED emission light source and reflector, and then the LCD screen mainly adopts RGB color screen. The consequence of this is that after the ultraviolet light passes through the LCD screen, the central optical power of the light source is high, and the surrounding optical power is low. As a result, in the model with high printing size requirements (±0.05mm), the optical power is different at different positions. , the violet light energy absorbed by the resin during the curing process is not the same, resulting in a large size deviation. Since the function of the reflector is to collect and reflect the violet light emitted by the LED light source, the light collected through the reflector is messy, and there will be stray light, which cannot reflect the good details of the model.

The RGB color screen will block 90% of the purple light under the screen due to its low transmittance, which will cause the screen to generate excessive heat and affect its screen life. Therefore, for the above shortcomings. It is necessary to emit a black and white screen with high transmittance and its matching light source assembly.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is: to provide a 3D printer with a high light transmission black and white screen, the light can be directly and uniformly irradiated to the black and white screen, the utilization rate of light can be improved under the same power, and the penetration rate of purple light is high under the same conditions. It is 3 to 4 times that of RGB color screen, high printing efficiency, high printing accuracy, and the heat dissipation effect of the printing process is very good.

The technical solution of the present invention is as follows: a high-transmittance black and white screen 3D printer, comprising a fixed frame, a Z-axis moving mechanism, a construction 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 a building platform plate, and the building platform plate is located above the photosensitive resin tank, and also includes a black and white liquid crystal screen, an optical conversion lens, and an LED light source. The black and white liquid crystal screen is arranged below the photosensitive resin tank, so The optical conversion lens is arranged above the LED light source.

Wherein, the optical conversion lens is a hemispherical lens.

With the above 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.

With the above technical solutions, in the high-transmittance black-and-white screen 3D printer, the LED light source is a flip-chip LED.

With the above technical solutions, the high-transmittance black-and-white screen 3D printer further includes a hood, the black-and-white liquid crystal screen is located on the top of the hood, and the optical conversion lens and the LED light source are located in the hood.

By adopting the above technical solutions, the present invention adopts a black and white liquid crystal screen to transmit light, and converts the divergent light of the LED light source into an energy-integrated and relatively uniform ultraviolet light through an optical conversion lens, and the LED light source adopts flip-chip LED. The cooling performance of the LCD screen is very good. There is no need for a reflector to collect light, which greatly improves the utilization of light at the same power. The single-layer exposure time of the black and white LCD screen is 3 to 4 times that of the RGB color screen. The same model can be printed by this scheme, which can save 3 to 4 times the time, greatly improve the printing speed, and improve the printing accuracy.

Description of drawings

Fig. 1 is the overall structure schematic diagram of the present invention;

Fig. 2 is the longitudinal section schematic diagram of the present invention;

FIG. 3 is a schematic diagram of a light source assembly of the present invention.

Detailed ways

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

As shown in Figures 1 to 3, this embodiment provides a high-transmittance black-and-white screen 3D printer, including a fixed frame, a Z-axis moving mechanism, a building platform, a photosensitive resin tank, a black-and-white liquid crystal screen, an optical conversion lens, and an LED light source. The Z-axis moving mechanism and the photosensitive resin tank are respectively arranged on the fixing frame, the bottom of the Z-axis moving mechanism is connected to a building platform plate, the building platform plate is located above the photosensitive resin tank, and the black and white liquid crystal screen is arranged in the photosensitive resin tank Below, the optical conversion lens is arranged above the LED light source.

Wherein, the optical conversion lens is a hemispherical lens, the bottom of the hemispherical lens is provided with a lens base, the lens base is hollow, and the lens base is located on the LED light source. After the LED light source emits light, the hemispherical lens can convert the oblique light emitted by the LED light source into an energy-integrated and relatively uniform ultraviolet light.

The energy-integrated and relatively uniform ultraviolet light passes through the black and white liquid crystal screen, and the black and white liquid crystal screen has high light transmittance. Of course, the high light transmittance in this embodiment refers to the transparent purple light. There is no color filter in each pixel of the black and white LCD screen, which allows the violet light to pass through directly. Compared with the conventional RGB color screen, the black and white liquid crystal screen in this embodiment: the transmittance of purple light is 3-4 times higher than that of the RGB color screen under the same conditions. At the same time, the calorific value of the black and white LCD screen will be greatly reduced, extending its service life. The power of the whole machine will also be reduced. Under the same scheme, the power of the whole machine can be reduced by 1/3 compared with the RGB color screen.

The traditional solution is to use front-mounted chip LEDs, and the LED light source of this embodiment is a flip-chip LED. The application of flip-chip LEDs in 3D printing has a very obvious effect: the chips can be placed more densely, the same size, more chips can be placed in the flip chip, and the characteristics of small size and high current light concentration can be realized. In addition, the direct contact of the flip chip with the substrate has better heat dissipation performance, and does not require a heat sink and a cooling fan. In 3D printing, the cost reduction and assembly efficiency are greatly improved.

As shown in FIG. 2 , in this embodiment, a hood is also provided, the black and white liquid crystal screen is located on the top of the hood, and the optical conversion lens and the LED light source are located in the hood. The hood can block and absorb excess UV light and prevent the light from shining outside.

As shown in Figure 1 and Figure 2, the specific working process of 3D printing is as follows:

1. The LED light source emits ultraviolet light of a specific band at a certain angle, and is uniformly illuminated on the black and white liquid crystal screen through the conversion of the optical conversion lens.

2. Ultraviolet light through optical conversion passes through the black and white LCD screen.

3. There is a photosensitive resin tank above the black and white LCD screen, and the photosensitive resin tank is filled with liquid photosensitive resin.

4. The black and white LCD screen displays the required pattern under the control of the driver board.

5. The pattern displayed by the black and white liquid crystal screen is irradiated by the optically converted ultraviolet light, and the curing reaction occurs through the black and white liquid crystal screen and the photosensitive resin in the material tank.

6. The resin above the display area of the black and white LCD screen is liquid, and the cured resin is located on the build platform.

7. The black and white LCD screen continuously displays the required shape under the action of the driving board, and at the same time, the Z axis moves up and down, which drives the building platform to move up and down, so that the resin is cured on the building platform layer by layer, and the required printing is repeated over and over. Three-dimensional products.

By adopting the above technical solutions, the present invention adopts a black and white liquid crystal screen to transmit light, and converts the divergent light of the LED light source into an energy-integrated and relatively uniform ultraviolet light through an optical conversion lens, and the LED light source adopts flip-chip LED. The cooling performance of the LCD screen is very good. There is no need for a reflector to collect light, which greatly improves the utilization of light at the same power. The single-layer exposure time of the black and white LCD screen is 3 to 4 times that of the RGB color screen. The same model can be printed by this scheme, which can save 3 to 4 times the time, greatly improve the printing speed, and improve the printing accuracy.

The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention. Inside.

Claims (4)

1. A high-light-transmitting black-and-white screen 3D printer, comprising a fixed frame, a Z-axis moving mechanism, a building platform, and a photosensitive resin tank, the Z-axis moving mechanism and the photosensitive resin tank are respectively arranged on the fixed frame, and the Z-axis The bottom of the moving mechanism is connected to a building platform plate, and the building platform plate is located above the photosensitive resin tank. It is characterized in that it also includes a black and white liquid crystal screen, an optical conversion lens, and an LED light source. The optical conversion lens is arranged above the LED light source; Wherein, the optical conversion lens is a hemispherical lens. 2 . The high-transmittance black-and-white screen 3D printer according to claim 1 , wherein 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. 3 . 3. The high-transmittance black-and-white screen 3D printer according to claim 2, wherein the LED light source is a flip-chip LED. 4 . The high-transmittance black-and-white screen 3D printer according to claim 1 , further comprising a light-shielding cover, the black-and-white liquid crystal screen is located on the top of the light-shielding cover, and the optical conversion lens and the LED light source are located in the light-shielding cover. 5 .

Images