CN111688187A - Projection device based on LCD (liquid crystal display), printer and illumination control method - Google Patents
Projection device based on LCD (liquid crystal display), printer and illumination control method Download PDFInfo
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- CN111688187A CN111688187A CN202010674602.0A CN202010674602A CN111688187A CN 111688187 A CN111688187 A CN 111688187A CN 202010674602 A CN202010674602 A CN 202010674602A CN 111688187 A CN111688187 A CN 111688187A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/10—Processes of additive manufacturing
- B29C64/106—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material
- B29C64/124—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material using layers of liquid which are selectively solidified
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/20—Apparatus for additive manufacturing; Details thereof or accessories therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/20—Apparatus for additive manufacturing; Details thereof or accessories therefor
- B29C64/264—Arrangements for irradiation
- B29C64/277—Arrangements for irradiation using multiple radiation means, e.g. micromirrors or multiple light-emitting diodes [LED]
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/30—Auxiliary operations or equipment
- B29C64/386—Data acquisition or data processing for additive manufacturing
- B29C64/393—Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y10/00—Processes of additive manufacturing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y30/00—Apparatus for additive manufacturing; Details thereof or accessories therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y50/00—Data acquisition or data processing for additive manufacturing
- B33Y50/02—Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes
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Abstract
The invention is suitable for the technical field of 3D printing, and provides a projection device based on an LCD liquid crystal display screen, which comprises an array point light source, an array splicing Fresnel lens, a first Fresnel lens, a convex lens, a second Fresnel lens and the LCD liquid crystal display screen which are sequentially arranged from top to bottom; the light path propagation direction of the light emitted by the array point light source is vertical to the array splicing Fresnel lens after passing through the array splicing Fresnel lens; the light rays passing through the array splicing Fresnel lens are focused above the convex lens after passing through the first Fresnel lens, and the focal point is scattered and condensed after passing through the convex lens within the focal range of the convex lens; the flat surface of the second Fresnel lens is opposite to the convex lens, and the light rays penetrating through the convex lens are vertical to the second Fresnel lens after penetrating through the second Fresnel lens; the distance between the LCD screen and the liquid level of the light-cured material is less than 5 cm. The invention can improve the printing success rate and efficiency of the product on the premise of reducing the production cost.
Description
Technical Field
The invention belongs to the technical field of 3D printing, and particularly relates to a projection device based on an LCD (liquid crystal display), a printer and an illumination control method.
Background
At present, most of LCD 3D printers on the market adopt a forming mode of polishing and pulling upwards, and after printing of each layer of products is finished on a printing platform, the printed products are tightly attached to a release film to remove the mold. However, the printer adopting the forming mode has low release success rate and low release speed, and the printing success rate and efficiency of the product are influenced.
In order to solve the above technical problems, there is also a DLP (Digital Light Processing) 3D printer in the market at present, where DLP is an abbreviation of "Digital Light Processing", that is, Digital Light Processing, that is, image signals are processed digitally and then Light is projected. The principle is that a cold light source emitted by a UHP bulb passes through a condensing lens, light is homogenized through a Rod of revolution (Rod of light), the processed light passes through a Color Wheel (Color Wheel), the light is divided into RGB (red, green, blue, green, blue, white, red, green, blue. The DLP sinking type 3D printer does not need a release process, so that the success rate is greatly improved.
However, there is room for improvement as the cost of DLP sink type 3D printers increases as the format of the printed product increases.
Disclosure of Invention
The invention provides a projection device, a printer and an illumination control method based on an LCD (liquid crystal display), aiming at solving the problem of improving the printing success rate and efficiency of a product on the premise of reducing the production cost.
The present invention is achieved in such a way that, in one aspect, there is provided a projection apparatus based on an LCD liquid crystal display, comprising: the LED display screen comprises array point light sources, array splicing Fresnel lenses formed by splicing a plurality of Fresnel lenses in an array mode, a first Fresnel lens, a convex lens, a second Fresnel lens and an LCD (liquid crystal display) screen which are sequentially arranged from top to bottom; the array point light source is used for emitting light rays capable of solidifying the liquid light solidifying material; the flat surface of the array splicing Fresnel lens is opposite to the array point light source, so that light rays emitted by the array point light source penetrate through the flat surface of the array splicing Fresnel lens to reach the concave-convex surface, and the propagation direction of a light path is vertical to the array splicing Fresnel lens; the concave-convex surface of the first Fresnel lens is opposite to the concave-convex surface of the array splicing Fresnel lens, so that light rays penetrating through the array splicing Fresnel lens are focused above the convex lens after penetrating through the concave-convex surface of the first Fresnel lens to the flat surface, and the focus is scattered and condensed after penetrating through the convex lens within the focal range of the convex lens; the flat surface of the second Fresnel lens is opposite to the convex lens, and the focusing focus of the first Fresnel lens and the convex lens are positioned at the focal length of the flat surface of the second Fresnel lens, so that the propagation direction of a light path after light rays penetrating through the convex lens penetrate through the flat surface of the second Fresnel lens to reach the concave-convex surface is perpendicular to the second Fresnel lens; and the distance between the LCD liquid crystal display screen and the liquid level of the light curing material is less than 5 cm.
Preferably, the wavelength of the light projected by the array point light source is 365-440 nm.
Preferably, the array point light sources are arranged in a plurality and distributed in a linear array.
Preferably, the array point light sources are UVLEDs.
Preferably, the optical axes of the array splicing fresnel lens, the first fresnel lens and the second fresnel lens are all coaxial with the optical axis of the convex lens.
Another aspect provides a 3D printer based on an LCD liquid crystal display, including: a projection device as described above; the material groove is arranged below the projection device, and a liquid photocuring material is arranged in the material groove; the frame is arranged close to the material groove, and one end of the frame extends into the material groove and is connected with the printing platform; and the lifting mechanism is arranged between the printing platform and the rack and is used for driving the printing platform to do lifting motion in the material groove.
Preferably, the lifting mechanism includes: the screw rod is arranged on the rack and is vertical to the printing platform; the sliding block is assembled on the screw rod in a sliding mode and is fixedly connected with the printing platform; and the motor is arranged on the rack and assembled with one end of the screw rod, and the motor drives the screw rod to rotate.
Preferably, the light curing material is a photosensitive resin.
In another aspect, an illumination control method for a 3D printer is provided, wherein the 3D printer includes the LCD liquid crystal display based projection device as described above; the material groove is arranged below the projection device, and a light curing material is arranged in the material groove; the frame is arranged close to the material groove, and one end of the frame extends into the material groove and is connected with the printing platform; the lifting mechanism is arranged between the printing platform and the rack and is used for driving the printing platform to do lifting motion in the material groove; the method comprises the following steps:
sequentially distributing an array point light source, an array splicing Fresnel lens, a first Fresnel lens, a convex lens, a second Fresnel lens and an LCD (liquid crystal display) screen of the projection device from top to bottom;
adjusting the optical axes of the array splicing Fresnel lens, the first Fresnel lens and the second Fresnel lens to be coaxial with the optical axis of the convex lens; and
the array point light source is started, so that light rays emitted by the array point light source penetrate through the array splicing Fresnel lens, then the projection direction is vertically downward, the light rays penetrate through the first Fresnel lens and then focus on the convex lens, the projection direction is distributed after the light rays penetrate through the convex lens, then the projection direction is vertically downward after the light rays penetrate through the second Fresnel lens, then the LCD liquid crystal display screen projects a projection image to the printing platform, and light curing materials in the projection range are cured and pasted on the printing platform.
Compared with the prior art, the embodiment of the application mainly has the following beneficial effects:
the invention provides a projection device based on an LCD (liquid crystal display) screen, which comprises: the array point light source, the array splicing Fresnel lens, the first Fresnel lens, the convex lens, the second Fresnel lens and the LCD are sequentially arranged from top to bottom; the flat surface of the array splicing Fresnel lens is opposite to the array point light source, so that light rays emitted by the array point light source penetrate through the flat surface of the array splicing Fresnel lens to reach the concave-convex surface, and the propagation direction of a light path is vertical to the array splicing Fresnel lens; the concave-convex surface of the first Fresnel lens is opposite to the concave-convex surface of the array splicing Fresnel lens, so that light rays penetrating through the array splicing Fresnel lens are focused above the convex lens after penetrating through the concave-convex surface of the first Fresnel lens to the flat surface, and the focus is scattered and condensed after penetrating through the convex lens within the focal range of the convex lens; the flat surface of the second Fresnel lens is opposite to the convex lens, and the focusing focus of the first Fresnel lens and the convex lens are positioned on the focal length of the flat surface of the second Fresnel lens, so that the propagation direction of a light path is vertical to the second Fresnel lens after light rays penetrating through the convex lens penetrate through the flat surface of the second Fresnel lens to the concave-convex surface; the distance between the LCD liquid crystal display screen and the liquid level of the light-cured material is less than 5 cm. The invention can improve the printing success rate and efficiency of the product on the premise of reducing the production cost.
Drawings
FIG. 1 is a schematic structural diagram of a projection apparatus based on an LCD liquid crystal display screen according to the present invention;
fig. 2 is a schematic flow chart of an irradiation control method for a 3D printer according to the present invention.
1. Array point light sources; 2. splicing Fresnel lenses in an array manner; 3. a first Fresnel lens; 4. a convex lens; 5. a second Fresnel lens; 6. an LCD liquid crystal display screen; 7. a trough; 8. a photo-curable material; 9. a frame; 10. a printing platform; 11. a lifting mechanism; 12. producing a product; 13. a focal point.
Detailed Description
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions. The terms "first," "second," and the like in the description and claims of this application or in the above-described drawings are used for distinguishing between different objects and not for describing a particular order.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
An embodiment of the present invention provides a projection apparatus based on an LCD liquid crystal display, as shown in fig. 1, including: the LED display screen comprises array point light sources 1, array splicing Fresnel lenses 2 formed by splicing a plurality of Fresnel lenses in an array mode, a first Fresnel lens 3, a convex lens 4, a second Fresnel lens 5 and an LCD 6LCD which are sequentially arranged from top to bottom; wherein, the array point light source 1 is used for emitting light capable of solidifying the liquid light solidified material 8; the flat surface of the array splicing Fresnel lens 2 is opposite to the array point light source 1, so that light rays emitted by the array point light source 1 penetrate through the flat surface of the array splicing Fresnel lens 2 to reach the concave-convex surface, and then the propagation direction of a light path is vertical to the array splicing Fresnel lens 2; the concave-convex surface of the first Fresnel lens 3 is arranged opposite to the concave-convex surface of the array splicing Fresnel lens 2, so that light rays penetrating through the array splicing Fresnel lens 2 are focused above the convex lens 4 after penetrating through the concave-convex surface of the first Fresnel lens 3 to reach a flat surface and then a focus 13 is focused on the convex lens 4, and in the focal range of the convex lens, the focus 13 is scattered and then is focused after penetrating through the convex lens 4; the flat surface of the second fresnel lens 5 is opposite to the convex lens 4, and the focusing focus 13 of the first fresnel lens 3 and the convex lens 4 are located at the focal length of the flat surface of the second fresnel lens 5, so that the propagation direction of the light path after the light passing through the convex lens 4 passes through the flat surface of the second fresnel lens 5 to reach the concave-convex surface is perpendicular to the second fresnel lens 5; and the distance between the LCD 6LCD and the liquid level of the light curing material 8 is less than 5 cm.
In the present embodiment, the array point light source 1 is capable of emitting light capable of curing the liquid photo-curing material 8 (such as photosensitive resin), and the wavelength of the light projected by the array point light source 1 is 365-440nm, so as to satisfy the requirement of curing the photo-curing material 8. Preferably uv leds, and are arranged in a plurality of linear arrays to increase the energy and range of the light. The UVLED has the advantages of long service life, cold array point light source 1, no heat radiation, no influence of the opening and closing times on the service life, high energy, uniform irradiation, improvement on the production efficiency, no toxic substance, and safety and environmental protection compared with the traditional array point light source 1.
Because most printers at present all are array's pointolite, give off light by a plurality of single point light sources simultaneously, directly go to shine liquid crystal display 6, make the light that every pointolite jetted out can have alternately, lead to hitting the luminous power degree of consistency on liquid crystal display 6 not high to influence and print whole precision. In addition, because the point light sources scatter off-center, short-range projection is not possible. Therefore, in this embodiment, the array splicing fresnel lens 2 is disposed below the array point light source 1, and the flat surface of the array splicing fresnel lens 2 is disposed opposite to the array point light source 1, so that the light emitted from the array point light source 1 is perpendicular to the array splicing fresnel lens 2 in the direction of propagation of the light path after the flat surface of the array splicing fresnel lens 2 reaches the concave-convex surface, i.e., the projection directions of the light from the array point light sources 1, which have different projection directions, are uniformly converted into vertical directions.
Further, set up first fresnel lens 3 in the below of array concatenation fresnel lens 2, and the concave-convex surface of first fresnel lens 3 sets up with the concave-convex surface of array concatenation fresnel lens 2 relatively for the light that will see through array concatenation fresnel lens 2 focuses on convex lens 4 top to smooth face back focus 13 at the concave-convex surface that sees through first fresnel lens 3, and in convex lens 4 focal length scope, focus 13 is through the spotlight behind convex lens 4 through scattering. The power of all array point light sources 1 is concentrated together by converging all the light rays above the convex lens 4, for example, the array point light sources 1 distributed in a 3 × 3 array are 9 array point light sources 1 in total, and the power of each array point light source 1 is 1 w. If the light is not polymerized, the power of the light emitted from the array point light source 1 is 1W, and the power of the polymerized point is 9W after the polymerization. Therefore, the light emitted by all array point light sources 1 can be converged into one high-power array point light source 1 by the invention. Specifically, the power intensity of the array point light sources 1 can be controlled by increasing or decreasing the number of the point array point light sources 1 or by transforming the voltage.
Further, the high power light focused on the convex lens 4 is scattered at the focal point 13 after passing through the convex lens 4 and is condensed after passing through the convex lens 4. Therefore, in order to realize that the projection direction of the dispersed high-power light rays can be vertically downward, the light rays of the multi-array point light source 1 are prevented from being crossed to influence the printing effect. In this embodiment, the second fresnel lens 5 is disposed below the convex lens 4, the flat surface of the second fresnel lens 5 is disposed opposite to the convex lens 4, and the focusing focal point 13 of the first fresnel lens 3 and the convex lens 4 are located at the focal length of the flat surface of the second fresnel lens 5, so that the light passing through the convex lens 4 is transmitted through the flat surface of the second fresnel lens 5 to the concave-convex surface, and then the propagation direction of the light path is perpendicular to the second fresnel lens 5, and finally the light is projected on the LCD liquid crystal display 6 disposed below the second fresnel lens. While in the present embodiment the distance between the LCD liquid crystal display 6 and the surface of the liquid of the light-curing material 8, e.g. a photosensitive resin, is defined to be less than 5 cm. Since the liquid crystal affects the light, any light will be scattered over a certain distance, and it is therefore more reasonable to limit the distance between the LCD screen 6 and the surface of the light-curable material 8 to less than 5 cm. The light penetrating through the LCD 6 has the effect of short-distance projection, and the requirement that the light for realizing the curing and forming of the light curing material 8 needs to have high precision and high power is met.
In this embodiment, the array-spliced fresnel lens 2, the first fresnel lens 3, and the second fresnel lens 5 are fresnel lenses with different focal lengths, and correspond to different effects. Fresnel lenses (Fresnel lenses), also known as screw lenses, are mostly sheets made of polyolefin materials by injection molding, and are also made of glass, one surface of the lens is a flat surface, and the other surface is inscribed with concentric circles from small to large, namely a concave-convex surface, and the texture of the lens is designed according to the requirements of light interference and interference, relative sensitivity and receiving angle. The projection direction of the light can be changed by utilizing the Fresnel lens so as to realize different effects.
In a further preferred embodiment of the present invention, as shown in fig. 1, the optical axes of the array-spliced fresnel lens 2, the first fresnel lens 3 and the second fresnel lens 5 are all arranged coaxially with the optical axis of the convex lens 4.
In this embodiment, the accuracy of the light rays finally projected onto the LCD liquid crystal display screen 6 can be improved by ensuring that the optical axes of the array splicing fresnel lens 2, the first fresnel lens 3 and the second fresnel lens 5 are all coaxial with the optical axis of the convex lens 4.
Another aspect of the embodiments of the present invention provides a 3D printer based on an LCD, as shown in fig. 1, including the projection apparatus as described above; a trough 7 arranged below the projection device, wherein a liquid light-cured material 8 is arranged in the trough 7; the frame 9 is arranged close to the trough 7, and one end of the frame 9 extends into the trough 7 and is connected with a printing platform 10; and the lifting mechanism 11 is arranged between the printing platform 10 and the rack 9 and is used for driving the printing platform 10 to do lifting motion in the trough 7.
In this embodiment, the LCD screen-based 3D printer includes a projection device, a trough 7, a frame 9, a printing platform 10, and a lifting mechanism 11. In particular, the projection device is used to effect curing of the light curable material 8 in a liquid state into a solid product 12. A tank 7 is arranged below the projection device for containing a liquid photocurable material 8. The frame 9 is arranged close to the trough 7, and one end of the frame 9 extends into the trough 7 and is connected with a printing platform 10 for placing 12 layers of products. The lifting mechanism 11 is disposed between the printing platform 10 and the frame 9, and is configured to drive the printing platform 10 to descend by one layer thickness each time the projection apparatus performs printing on a layer of products 12 on the projection platform.
Wherein, elevating system 11 includes: a screw (not shown) mounted on said frame 9 and perpendicular to said printing platform 10; a slide block (not shown in the figure) slidably mounted on the screw rod and fixedly connected with the printing platform 10; and a motor (not shown in the figure) which is arranged on the frame 9 and is assembled with one end of the screw rod, wherein the motor drives the screw rod to rotate.
In the embodiment, the lifting mechanism 11 is a lifting mechanism 11 adopted by a conventional printer in the market, and the specific mechanism can refer to an existing printer, which is not specifically shown in the drawing of the scheme.
In one aspect, the embodiment of the present invention provides an illumination control method for a 3D printer, as shown in fig. 2, where the 3D printer includes the above projection apparatus based on an LCD liquid crystal display; a material groove 7 arranged below the projection device, wherein a light-cured material 8 is arranged in the material groove 7; the frame 9 is arranged close to the trough 7, and one end of the frame 9 extends into the trough 7 and is connected with a printing platform 10; the lifting mechanism 11 is arranged between the printing platform 10 and the rack 9 and is used for driving the printing platform 10 to do lifting motion in the material tank 7; the method comprises the following steps:
s1: sequentially arranging an array point light source 1, an array splicing Fresnel lens 2, a first Fresnel lens 3, a convex lens 4, a second Fresnel lens 5 and an LCD (liquid crystal display) 6 of the projection device from top to bottom;
s2: adjusting the optical axes of the array splicing Fresnel lens 2, the first Fresnel lens 3 and the second Fresnel lens 5 to be coaxial with the optical axis of the convex lens 4; and
s3: the array point light source 1 is started, so that light rays emitted by the array point light source 1 penetrate through the flat surface of the array splicing Fresnel lens 2 to the rear light path propagation direction perpendicular to the rear light path from the flat surface to the concave-convex surface of the array splicing Fresnel lens 2, then penetrate through the concave-convex surface of the first Fresnel lens 3 to the rear light path propagation direction perpendicular to the second Fresnel lens 3 from the concave-convex surface to the convex surface of the convex lens 4, then penetrate through the focal length range of the convex lens 4, scatter and penetrate through the concave lens 4 to condense light, then penetrate through the flat surface of the second Fresnel lens 5 to the rear light path propagation direction perpendicular to the convex surface of the convex lens 3, and then penetrate through the LCD liquid crystal display screen 6 to project a projection image to the printing platform 10, so that the light curing material 8 in the projection range is cured and pasted.
It should be noted that, for simplicity of description, the above-mentioned embodiments are described as a series of acts, but those skilled in the art will recognize that the present invention is not limited by the order of acts, as some steps may occur in other orders or concurrently in accordance with the invention. Further, those skilled in the art should also appreciate that the embodiments described in the specification are preferred embodiments and that the acts and modules referred to are not necessarily required by the invention.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus may be implemented in other manners. For example, the above-described embodiments of the apparatus are merely illustrative, and for example, the above-described division of the units is only one type of division of logical functions, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or communication connection may be an indirect coupling or communication connection between devices or units through some interfaces, and may be in a telecommunication or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
The above examples are only used to illustrate the technical solutions of the present invention, and do not limit the scope of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from these embodiments without making any inventive step, fall within the scope of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art may still make various combinations, additions, deletions or other modifications of the features of the embodiments of the present invention according to the situation without conflict, so as to obtain different technical solutions without substantially departing from the spirit of the present invention, and these technical solutions also fall within the protection scope of the present invention.
Claims (9)
1. A projection device based on an LCD display, comprising:
the LED display screen comprises array point light sources, array splicing Fresnel lenses formed by splicing a plurality of Fresnel lenses in an array mode, a first Fresnel lens, a convex lens, a second Fresnel lens and an LCD (liquid crystal display) screen which are sequentially arranged from top to bottom;
the array point light source is used for emitting light rays capable of solidifying the liquid light solidifying material;
the flat surface of the array splicing Fresnel lens is opposite to the array point light source, so that light rays emitted by the array point light source penetrate through the flat surface of the array splicing Fresnel lens to reach the concave-convex surface, and the propagation direction of a light path is vertical to the array splicing Fresnel lens;
the concave-convex surface of the first Fresnel lens is opposite to the concave-convex surface of the array splicing Fresnel lens, so that light rays penetrating through the array splicing Fresnel lens are focused above the convex lens after penetrating through the concave-convex surface of the first Fresnel lens to the flat surface, and the focus is scattered and condensed after penetrating through the convex lens within the focal range of the convex lens;
the flat surface of the second Fresnel lens is opposite to the convex lens, and the focusing focus of the first Fresnel lens and the convex lens are positioned at the focal length of the flat surface of the second Fresnel lens, so that the propagation direction of a light path after light rays penetrating through the convex lens penetrate through the flat surface of the second Fresnel lens to reach the concave-convex surface is perpendicular to the second Fresnel lens;
and the distance between the LCD liquid crystal display screen and the liquid level of the light curing material is less than 5 cm.
2. The projection apparatus as claimed in claim 1, wherein the wavelength of the light projected by the array point light source is 365-440 nm.
3. The projection apparatus of claim 2 wherein the array of point light sources is provided in a plurality and arranged in a linear array.
4. The projection apparatus of claim 3 wherein the array point light sources are UVLEDs.
5. The projection apparatus according to claim 1, wherein optical axes of the array-split fresnel lens, the first fresnel lens, and the second fresnel lens are all disposed coaxially with the optical axis of the convex lens.
6. The utility model provides a 3D printer based on LCD liquid crystal display, its characterized in that includes: the projection device of claims 1-5;
the material groove is arranged below the projection device, and a liquid photocuring material is arranged in the material groove;
the frame is arranged close to the material groove, and one end of the frame extends into the material groove and is connected with the printing platform; and
and the lifting mechanism is arranged between the printing platform and the rack and is used for driving the printing platform to do lifting motion in the material groove.
7. The 3D printer of claim 6, wherein the lifting mechanism comprises:
the screw rod is arranged on the rack and is vertical to the printing platform;
the sliding block is assembled on the screw rod in a sliding mode and is fixedly connected with the printing platform; and
and the motor is arranged on the rack and assembled with one end of the screw rod, and drives the screw rod to rotate.
8. The 3D printer of claim 7, wherein the light curable material is a photosensitive resin.
9. An illumination control method for a 3D printer, wherein the 3D printer comprises an LCD liquid crystal display based projection device according to any one of claims 1 to 5; the material groove is arranged below the projection device, and a light curing material is arranged in the material groove; the frame is arranged close to the material groove, and one end of the frame extends into the material groove and is connected with the printing platform; the lifting mechanism is arranged between the printing platform and the rack and is used for driving the printing platform to do lifting motion in the material groove; the method comprises the following steps:
sequentially distributing an array point light source, an array splicing Fresnel lens, a first Fresnel lens, a convex lens, a second Fresnel lens and an LCD (liquid crystal display) screen of the projection device from top to bottom;
adjusting the optical axes of the array splicing Fresnel lens, the first Fresnel lens and the second Fresnel lens to be coaxial with the optical axis of the convex lens; and
the array point light source is opened, so that light rays emitted by the array point light source penetrate through the flat surface of the array splicing Fresnel lens and the back light path propagation direction of the flat surface of the array splicing Fresnel lens is perpendicular to the array splicing Fresnel lens, then the light rays penetrate through the flat surface of the first Fresnel lens and the back focus of the flat surface of the first Fresnel lens and the convex lens, the focus is focused above the convex lens within the focal distance range of the convex lens, the focus is scattered and penetrates through the convex lens and then is focused, the light rays penetrate through the flat surface of the second Fresnel lens and the back light path propagation direction of the flat surface of the second Fresnel lens and the second Fresnel lens, and then the light rays penetrate through the LCD to project images on the printing platform, so that the light curing material within the projection range is cured and.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010674602.0A CN111688187A (en) | 2020-07-14 | 2020-07-14 | Projection device based on LCD (liquid crystal display), printer and illumination control method |
| PCT/CN2020/109793 WO2022011775A1 (en) | 2020-07-14 | 2020-08-18 | Projection apparatus based on lcd, printer, and illumination control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010674602.0A CN111688187A (en) | 2020-07-14 | 2020-07-14 | Projection device based on LCD (liquid crystal display), printer and illumination control method |
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| Publication Number | Publication Date |
|---|---|
| CN111688187A true CN111688187A (en) | 2020-09-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010674602.0A Pending CN111688187A (en) | 2020-07-14 | 2020-07-14 | Projection device based on LCD (liquid crystal display), printer and illumination control method |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN111688187A (en) |
| WO (1) | WO2022011775A1 (en) |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2643713B2 (en) * | 1992-03-13 | 1997-08-20 | 株式会社日立製作所 | LCD projection display |
| TWI313784B (en) * | 2006-08-25 | 2009-08-21 | Coretronic Corp | Projection system |
| CN105711088B (en) * | 2014-12-02 | 2019-12-17 | 北京十维科技有限责任公司 | Photocuring 3D printer |
| CN204515333U (en) * | 2015-03-27 | 2015-07-29 | 郑州迪飞机电设备有限公司 | For the Novel light source of Projection Display |
| CN106426915B (en) * | 2016-10-26 | 2019-01-11 | 青岛理工大学 | High-speed continuous photocuring 3D printing device and working method thereof |
| CN108466427A (en) * | 2017-02-23 | 2018-08-31 | 上海冠显光电科技有限公司 | A kind of photocuring 3D printing optical module and photocuring 3D printing system |
| CN107861253B (en) * | 2017-12-08 | 2020-11-10 | 青岛海信激光显示股份有限公司 | Laser projection device |
| CN212603426U (en) * | 2020-07-14 | 2021-02-26 | 深圳市布尔三维技术有限公司 | LCD liquid crystal display screen-based projection device and printer |
-
2020
- 2020-07-14 CN CN202010674602.0A patent/CN111688187A/en active Pending
- 2020-08-18 WO PCT/CN2020/109793 patent/WO2022011775A1/en active Application Filing
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| WO2022011775A1 (en) | 2022-01-20 |
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