CN109968662B - Light source device and 3D printing system - Google Patents
Light source device and 3D printing system Download PDFInfo
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- CN109968662B CN109968662B CN201910250536.1A CN201910250536A CN109968662B CN 109968662 B CN109968662 B CN 109968662B CN 201910250536 A CN201910250536 A CN 201910250536A CN 109968662 B CN109968662 B CN 109968662B
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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
- B29C64/264—Arrangements for irradiation
- B29C64/277—Arrangements for irradiation using multiple radiation means, e.g. micromirrors or multiple light-emitting diodes [LED]
- B29C64/282—Arrangements for irradiation using multiple radiation means, e.g. micromirrors or multiple light-emitting diodes [LED] of the same type, e.g. using different energy levels
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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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Abstract
The invention belongs to the technical field of 3D printing, and discloses a light source device and a 3D printing system. The light source device comprises a backlight assembly and a liquid crystal module; the light emitting surface of the backlight assembly faces the bottom of a liquid storage tank in the 3D printing system; the liquid crystal module comprises at least two liquid crystal screens which are sequentially spliced and arranged on one side of the light emitting surface of the backlight assembly and used for guiding light rays emitted by the light assembly to the bottom of the liquid storage tank. The light source device printing device forms a large-size light guide structure by splicing at least two high-resolution liquid crystal screens, light rays emitted by the backlight assembly are seamlessly spliced and shot into the liquid storage tank with high definition to form preset patterns, high-precision printing of large-size objects of the 3D printing system is finally achieved, and the problems that the printing precision is low, the speed is low, the cost is high and the like when the large-size objects in the existing market can only be printed by using the large-size light source device with lower resolution as an exposure mask plate or an SLA system are solved.
Description
Technical Field
The invention relates to the technical field of 3D printing, in particular to a light source device and a 3D printing system.
Background
The 3D Printing (3 DP) technology is a technology for generating a Three-dimensional entity by adding materials layer by layer through stacking of continuous physical layers, and is different from a traditional material removing processing technology, and therefore, the technology is also called an Additive Manufacturing (AM) technology, and is previously called a Rapid Prototyping (RP) technology.
At present, the printing technology is basically used for printing large-size objects in the following two ways. One is Stereolithography (SLA), which uses a laser with a specific wavelength and intensity focused onto the surface of a material. Sequentially solidifying the three-dimensional solid from point to line and from line to surface to finish the operation of one layer, then moving the height of one layer in the vertical direction through the lifting platform, then solidifying to finish the other layer, and finally laminating to form a three-dimensional entity; and secondly, a larger-size TV-type Liquid Crystal Display (LCD) is used as an exposure mask plate to carry out UV light source control resin curing and printing, wherein the former has the problems of high cost, high requirement and slow printing speed, and the latter has the problems of low printing precision and poor printing quality.
In order to solve the technical problem, a technical scheme for realizing large-size pattern imaging by splicing a high-precision liquid crystal screen is provided, but as shown in fig. 1, a frame 12 is generally arranged on the periphery of a display area 11 of the liquid crystal screen, and the frame 12 of the liquid crystal screen in the above manner forms a display blind area (an area shown by a dotted line frame in fig. 2) when light of the liquid crystal screen is emitted into a liquid storage tank, so that the final imaged pattern is incomplete, and a 3D printing error is caused.
Disclosure of Invention
The invention discloses a light source device and a 3D printing system, which are used for splicing a liquid crystal display screen with high precision and small size in 3D printing to realize large-size object printing.
In order to achieve the purpose, the invention provides the following technical scheme:
a light source device comprising: a backlight assembly and a liquid crystal module;
the light emitting surface of the backlight assembly faces the bottom of a liquid storage tank in the 3D printing system;
the liquid crystal module comprises at least two liquid crystal screens which are sequentially spliced on one side of the light emitting surface of the backlight assembly and used for guiding light rays emitted by the backlight assembly to the bottom of the liquid storage tank.
According to the light source device printing device, the large-size light guide structure is formed by splicing at least two high-resolution liquid crystal screens, light rays emitted by the backlight assembly are seamlessly spliced and shot into the liquid storage tank with high definition to form preset patterns, high-precision printing of large-size objects of the 3D printing system is finally achieved, and the problems that in the existing market, the large-size objects can only be printed by using the large-size light source device with lower resolution as an exposure mask plate or an SLA system, printing precision is low, printing speed is slow, printing cost is high and the like are solved.
Optionally, the widths of the frames of any two adjacent liquid crystal screens in the liquid crystal modules are the same, and,
the light emergent surfaces of the two liquid crystal screens form an included angle theta, wherein,
and the s is the width of the frame of the liquid crystal screen, and the d is the distance between the edge of the frame spliced by the liquid crystal screen and the bottom of the liquid storage tank along the direction vertical to the liquid crystal screen, wherein the edge is adjacent to the display area.
Optionally, the liquid crystal module includes a first liquid crystal screen parallel to the bottom of the liquid storage tank and at least one second liquid crystal screen sequentially spliced around the first liquid crystal screen.
Optionally, the number of the second liquid crystal panels is multiple, and the multiple second liquid crystal panels are in a central symmetry structure with the first liquid crystal panel as a center.
Optionally, the liquid crystal module includes a first liquid crystal screen and a second liquid crystal screen;
the first liquid crystal screen and the second liquid crystal screen are symmetrically arranged by taking a plane perpendicular to the bottom of the liquid storage tank as a symmetrical plane.
Optionally, the liquid crystal module further comprises at least one first auxiliary liquid crystal screen spliced with the first liquid crystal screen;
and/or the presence of a gas in the gas,
the liquid crystal module further comprises at least one second auxiliary liquid crystal screen spliced with the second liquid crystal screen.
Optionally, the number of the first auxiliary liquid crystal screens is multiple, and the multiple first auxiliary liquid crystal screens are sequentially spliced on one side of the first liquid crystal screen, which is far away from the second liquid crystal screen;
and/or the presence of a gas in the gas,
the second auxiliary liquid crystal screens are multiple and sequentially spliced on one side, away from the first liquid crystal screen, of the second liquid crystal screen.
Optionally, the first auxiliary liquid crystal display and the second auxiliary liquid crystal display are both multiple, and the first auxiliary liquid crystal display and the second auxiliary liquid crystal display are symmetrically arranged around a plane perpendicular to the bottom of the liquid storage tank.
Optionally, the light emitting surface of the liquid crystal module is parallel to the bottom of the liquid storage tank;
and in any two connected liquid crystal screens, a lens assembly is correspondingly arranged on one side of the light emergent surface of at least one of the liquid crystal screens.
Optionally, the lens assembly includes a biconvex lens and a concave lens sequentially arranged from the reservoir to the liquid crystal panel.
Optionally, in any two adjacent liquid crystal panels, the lens assembly is correspondingly arranged on one side of the light emitting surface of one of the liquid crystal panels, and the following relationship exists between the focal lengths of the biconvex lens and the concave lens:
wherein f is1Is the focal length of the concave lens, f2And L is the focal length of the double-sided convex lens, L is the length of a display area of the liquid crystal screen perpendicular to a splicing line between the two liquid crystal screens, and s is the width of a frame of the liquid crystal screen.
Optionally, the lens assemblies are correspondingly arranged on the light emitting sides of the liquid crystal panels, and the following relationship exists between the double-sided convex lens and the concave lens:
wherein f is1Is the focal length of the concave lens, f2The focal length of the double-sided convex lens is L, the length of a display area of the liquid crystal screen perpendicular to a splicing line between the two liquid crystal screens is SAnd the width of the frame of the liquid crystal screen.
A 3D printing system, comprising: the device comprises a rack, a liquid storage tank, a forming supporting plate and any one of the light source devices provided by the technical scheme;
the liquid storage tank is arranged on the rack and filled with liquid photosensitive resin;
the light source device is arranged on the rack and is positioned below the bottom of the liquid storage tank;
the forming supporting plate is movably arranged on the rack and located above the liquid storage tank, and the forming supporting plate can move in or out of the liquid storage tank along the vertical direction, so that the liquid photosensitive resin is cured and formed on the forming supporting plate under the illumination effect of the light source device.
Drawings
FIG. 1 is a schematic structural diagram of a conventional LCD panel;
FIG. 2 is a schematic structural diagram of a conventional LCD splicing application in a 3D printing system;
fig. 3 is a schematic structural diagram of a first liquid crystal module applied in a 3D printing system according to a first embodiment of the present disclosure;
FIG. 4 is a schematic diagram illustrating the light path of the LCD panel of FIG. 3;
fig. 5 is a schematic structural diagram of a 3D printing system to which a second liquid crystal module provided in a first embodiment of the present invention is applied;
fig. 6 is a schematic structural diagram of a third liquid crystal module applied in a 3D printing system according to the first embodiment;
FIG. 7 is a schematic diagram illustrating the light path of the LCD panel of FIG. 6;
fig. 8 is a schematic structural diagram of a fourth liquid crystal module applied in a 3D printing system according to the first embodiment;
fig. 9 is a schematic structural diagram of a fifth liquid crystal module applied in a 3D printing system according to a first embodiment of the present disclosure;
fig. 10 is a top view of a fifth liquid crystal module according to the first embodiment of the present disclosure;
fig. 11 is a top view of a sixth liquid crystal module according to the first embodiment of the present disclosure;
fig. 12 is a top view of a seventh liquid crystal module according to the first embodiment of the present disclosure;
fig. 13 is a top view of an eighth liquid crystal module according to the first embodiment of the present disclosure;
fig. 14 is a top view of a ninth liquid crystal module according to the first embodiment of the present disclosure;
fig. 15 is a schematic structural diagram of a 3D printing system to which a first liquid crystal module provided in a second embodiment of the first embodiment is applied;
FIG. 16 is a schematic diagram illustrating the path of light rays from the LCD panel of FIG. 15;
fig. 17 is a schematic structural diagram of a second liquid crystal module applied to a 3D printing system according to a second embodiment of the first embodiment;
fig. 18 is a schematic structural diagram of a third liquid crystal module applied in a 3D printing system according to the second embodiment;
fig. 19 is a schematic structural diagram of a fourth liquid crystal module applied in a 3D printing system according to the second embodiment;
FIG. 20 is a top view of a fourth liquid crystal module according to the second embodiment of the present invention;
fig. 21 is a top view of a fifth liquid crystal module according to the second embodiment of the present invention;
fig. 22 is a top view of a seventh liquid crystal module according to the second embodiment of the present invention;
fig. 23 is a schematic structural diagram of a liquid crystal module applied in a 3D printing system according to a second embodiment;
fig. 24 is a schematic structural diagram of another liquid crystal module applied in a 3D printing system according to the second embodiment;
fig. 25 is a schematic structural diagram of another liquid crystal module applied in a 3D printing system according to the second embodiment.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
An embodiment of the present invention provides a light source device, including: a backlight assembly 2 and a liquid crystal module; the light emitting surface of the backlight assembly 2 faces the bottom of a liquid storage tank 3in the 3D printing system; the liquid crystal module comprises at least two liquid crystal screens 1 which are sequentially spliced and arranged on one side of the light emergent surface of the backlight assembly 2 and used for guiding light rays emitted by the backlight assembly 2 to the bottom of the liquid storage tank 3.
As shown in fig. 3, the backlight module 2 is disposed at the bottom of the liquid storage tank 3 of the 3D printing system, the liquid crystal module is disposed between the light emitting surface of the backlight module 2 and the bottom of the liquid storage tank 3, light emitted by the backlight module 2 is projected into the liquid storage tank 3 of the 3D printing system after being developed by the liquid crystal module to be seamlessly spliced into a preset pattern, and liquid photosensitive resin in the liquid storage tank 3 of the 3D printing system is molded on the molding supporting plate 5 according to the pattern, so that 3D printing is finally achieved.
The backlight assembly 2 in this embodiment emits light capable of forming a predetermined pattern according to the system configuration. The liquid crystal module is formed by splicing at least two liquid crystal screens 1 with high precision and small sizes, and light rays emitted by the backlight assembly 2 are respectively displayed by the liquid crystal screens 1 in a partition mode and are seamlessly spliced in the liquid storage tank 3 through the bottom of the liquid storage tank 3 to form a complete preset pattern for the 3D printing system to work and refer. In this embodiment, the backlight assembly 2 for providing a light source may be configured such that all the liquid crystal panels 1 share one backlight assembly 2, or may be configured such that a plurality of liquid crystal panels 1 share one backlight assembly 2, or may be configured such that each of the liquid crystal panels 1 is respectively provided with one backlight assembly 2.
In the mode of carrying out 3D printing by using a larger-size TV-type LCD module as an exposure mask in the market at present, the maximum resolution of the LCD module is 3840 × 2160RGB, the pixel number is lower, and when a large-size object is printed, the printing precision is poor, the surface of the printed model is rough, and the market requirement cannot be met. In the embodiment, the small-size and high-precision liquid crystal screen 1 is selected and used, and the spliced liquid crystal screen is applied to a 3D printing system to print a high-precision large-size object. Specifically, the liquid crystal panel 1 in the present embodiment may be similar to the liquid crystal panel 1 with a size of 13.3inch and a resolution of 4K or 2K.
It can be seen that, the light source device printing device forms a large-size light guide structure by splicing at least two high-resolution liquid crystal screens 1, light rays emitted by the backlight assembly 2 are seamlessly spliced and injected into the liquid storage tank 3 to form preset patterns, high-precision printing of large-size objects of the 3D printing system is finally realized, and the problems of low printing precision, low speed, high cost and the like of printing large-size objects in the existing market only by using the large-size light source device with lower resolution as an exposure mask plate or an SLA system are solved.
In order to realize that light rays absorbed into the liquid storage tank 3 by each liquid crystal screen 1 can be seamlessly spliced into a complete preset pattern, the embodiment at least adopts the following two implementation modes to prevent the frame 12 of the liquid crystal screen 1 from having no light rays projected into the liquid storage tank 3 to form a printing blind area, and finally provides a correct pattern reference for the 3D printing system to print out a correct pattern structure. It should be noted that, in the following embodiments, each of the liquid crystal panels 1 is correspondingly provided with a backlight assembly 2 parallel to the liquid crystal panel 1.
Example one
In the present embodiment, the installation positions of the liquid crystal panels 1 are adjusted so that the optical fibers displaying the patterns of the adjacent liquid crystal panels 1 are seamlessly spliced into the preset pattern when being absorbed into the liquid storage tank 3. Specifically, the widths of the frames of any two liquid crystal screens 1 connected with each other in the liquid crystal module are the same, and,
the light emergent surfaces of the two liquid crystal screens 1 form an included angle theta, wherein,
wherein s is the frame width of the liquid crystal screen 1, and d is the distance between the edge of the frame 12 spliced by one liquid crystal screen 1 adjacent to the display area 11 and the bottom of the liquid storage tank 3 along the direction vertical to one liquid crystal screen 1. It can be seen that, on the premise that the widths of the frames of the two connected liquid crystal panels 1 are the same, the size of θ is related to the distance and the position relation of the liquid crystal panels 1 relative to the bottom of the liquid storage tank 3.
It should be noted that, in general, the light emitted from the liquid crystal panel 1 is emitted perpendicularly to the light emitting surface of the liquid crystal panel 1, but in actual operation, the light at the inner side edge of the frame 12 of the liquid crystal panel 1 may have an angular deviation, in this case, the light at the inner side edge of the frame 12 of the two connected liquid crystal panels 1 may have a splicing deviation (such as overlapping or gap) when being absorbed into the liquid storage tank 3, and in order to compensate for the above deviation, in actual use, the θ angle formed between the light emitting surfaces of the two liquid crystal panels 1 may be correspondingly compensated and adjusted.
In this embodiment, the arrangement of at least the liquid crystal panel 1 may be implemented in various ways as follows.
In a first mode
The liquid crystal module comprises a first liquid crystal screen 101 parallel to the bottom of the liquid storage tank 3 and at least one second liquid crystal screen 102 sequentially spliced around the first liquid crystal screen 101. The first liquid crystal screen 101 and the second liquid crystal screen 102 correspond to the respective backlight assembly 2, under the irradiation of a light source of the backlight assembly 2, the first liquid crystal screen 101 and the second liquid crystal screen 102 respectively correspond to a part of a preset pattern, and the patterns displayed by the first liquid crystal screen 101 and the second liquid crystal screen 102 are seamlessly spliced together to form a complete preset pattern. The specific structure is exemplified as follows.
The structure I is as follows: as shown in fig. 3, a liquid crystal module is formed by a first liquid crystal panel 101 and a second liquid crystal panel 102, the first liquid crystal panel 101 is the liquid crystal panel 1 on the right side of the figure, and the first liquid crystal panel 101 is disposed at the bottom of the liquid storage tank 3 and the light-emitting surface of the first liquid crystal panel 101 is parallel to the bottom of the liquid storage tank 3. The second liquid crystal screen 102 is the liquid crystal screen 1 spliced at the left edge of the first liquid crystal screen 101, the second liquid crystal screen 102 is also arranged at the bottom of the liquid storage tank 3, but an included angle theta is formed between the light-emitting surface of the second liquid crystal screen 102 and the light-emitting surface of the first liquid crystal screen 101, and correspondingly, an included angle of 180-theta is formed between the light-emitting surface of the second liquid crystal screen 102 and the bottom of the liquid storage tank 3. According to the positional relationship among the first liquid crystal panel 101, the second liquid crystal panel 102 and the liquid storage tank 3, a trigonometric function relation graph of light rays as shown in fig. 4 is obtained, where s is a frame width of the first liquid crystal panel 101 or the second liquid crystal panel 102, d is a distance between a direction perpendicular to the first liquid crystal panel 101 and a front portion of the bottom of the liquid storage tank 3, and a direction perpendicular to the second liquid crystal panel 102, and a distance between a direction perpendicular to the second liquid crystal panel 102 and a front portion of the bottom of the liquid storage tank 3, and a direction perpendicular to the first liquid crystal panel 101, and a direction perpendicular to the display area 11 (i.e., a direction perpendicular to the first liquid crystal panel 101, and a distance between the frame 12 and a front portion of the bottom of the liquid storage tank 3, are obtained. It can be seen that two symmetric right-angled triangles with equal size are formed between the first liquid crystal panel 101, the second liquid crystal panel 102 and the bottom of the liquid storage tank 3, and the symmetric axis is the hypotenuse of the right-angled triangle. Light rays emitted by the edge, close to the second liquid crystal screen 102, of the display area 11 of the first liquid crystal screen 101 and light rays emitted by the edge, close to the first liquid crystal screen 101, of the display area 11 of the second liquid crystal screen 102 converge at a point O at the bottom of the liquid storage tank 3, so that printing blind areas, which are possibly formed in the liquid storage tank 3, of the frame 12 of the first liquid crystal screen 101 and the frame 12 of the second liquid crystal screen 102 corresponding to the point S are eliminated, and light rays emitted into the liquid storage tank 3 by the patterns displayed by the first liquid crystal screen 101 and the second liquid crystal screen 102 can be spliced into a preset complete pattern.
The structure II is as follows: on the basis of the first structure, at least two second liquid crystal panels 102 are arranged, and each second liquid crystal panel 102 is spliced on the left side of the first liquid crystal panel 101 in sequence. As shown in fig. 5, two second liquid crystal panels 102 are taken as an example. The angle theta is formed between the second liquid crystal screen 102 spliced with the first liquid crystal screen 101 and the first liquid crystal screen 101, the angle theta 'is formed between the two connected second liquid crystal screens 102, and the light rays at the edges of the two second liquid crystal screens 102 converge at the point O' at the bottom of the liquid storage tank 3, so that a printing blind area cannot be formed when the light rays of any two connected liquid crystal screens 1 are emitted into the liquid storage tank 3 by the frame 12 between the two connected liquid crystal screens 1. When the number of the second liquid crystal panels 102 is more than two, and so on.
The structure is three: as a variation of the liquid crystal module structure shown in the first structure, fig. 6 shows another structure in which a first liquid crystal panel 101 and a second liquid crystal panel 102 form a liquid crystal module, where the first liquid crystal panel 101 is the liquid crystal panel 1 on the left side of the figure, the first liquid crystal panel 101 is disposed at the bottom of the liquid storage tank 3, and the light emitting surface of the first liquid crystal panel 101 is parallel to the bottom of the liquid storage tank 3. The second liquid crystal screen 102 is the liquid crystal screen 1 spliced at the right edge of the first liquid crystal screen 101, the second liquid crystal screen 102 is also arranged at the bottom of the liquid storage tank 3, but an included angle theta is formed between the light-emitting surface of the second liquid crystal screen 102 and the light-emitting surface of the first liquid crystal screen 101, and correspondingly, an included angle of 180-theta is formed between the light-emitting surface of the second liquid crystal screen 102 and the bottom of the liquid storage tank 3. In this configuration, a trigonometric function graph of the light rays as shown in fig. 7 is obtained from the positional relationship of the first liquid crystal panel 101, the second liquid crystal panel 102, and the reservoir 3.
The structure is four: on the basis of the third structure, at least two second liquid crystal panels 102 are provided, and the second liquid crystal panels 102 are sequentially spliced on the right side of the first liquid crystal panel 101. As shown in fig. 8, two second liquid crystal panels 102 are taken as an example. The second liquid crystal screen 102 spliced with the first liquid crystal screen 101 forms a theta included angle with the first liquid crystal screen 101, a theta 'included angle is formed between the two connected second liquid crystal screens 102, and light rays at the edges of the two second liquid crystal screens 102 converge at an O' point at the bottom of the liquid storage tank 3, so that a printing blind area cannot be formed when the light rays of any two connected liquid crystal screens 1 are emitted into the liquid storage tank 3 by the frame 12 between the two connected liquid crystal screens 1.
The structure is five: when there are two second liquid crystal panels 102, as shown in fig. 9, the first liquid crystal panel 101 is the liquid crystal panel 1 in the middle of the figure, and the first liquid crystal panel 101 is disposed at the bottom of the liquid storage tank 3 and the light-emitting surface of the first liquid crystal panel is parallel to the bottom of the liquid storage tank 3. The two second liquid crystal panels 102 are respectively spliced on the left side and the right side of the first liquid crystal panel 101, wherein the top view of the liquid crystal module with the structure is shown in fig. 10. Each second liquid crystal panel 102 is also disposed at the bottom of the liquid storage tank 3, but an included angle θ is formed between the light-emitting surface of each second liquid crystal panel 102 and the light-emitting surface of the first liquid crystal panel 101, the light rays at the respective edges of the second liquid crystal panel 102 and the first liquid crystal panel 101 on the left side of the first liquid crystal panel 101 converge at the point O at the bottom of the liquid storage tank 3, and the light rays at the respective edges of the second liquid crystal panel 102 and the first liquid crystal panel 101 on the right side of the first liquid crystal panel 101 converge at the point O' at the bottom of the liquid storage tank 3.
The structure is six: on the basis of the fifth structure, the second liquid crystal panels 102 may be a plurality of, and the plurality of second liquid crystal panels 102 are arranged by being sequentially spliced to extend to the left and right sides of the first liquid crystal panel 101 by using the first liquid crystal panel 101 as a center. All the liquid crystal screens 1 including the first liquid crystal screen 101 and the second liquid crystal screen 102 form an included angle theta between any two connected liquid crystal screens 1, wherein the included angle theta changes along with the distance between the liquid crystal screen 1 and the liquid storage tank 3 corresponding to the included angle theta. Taking the number of the second liquid crystal panels 102 as three as an example, one side of the first liquid crystal panel 101 is spliced with one second liquid crystal panel 102, and the other side is spliced with two second liquid crystal panels 102 in sequence, and the top view of the liquid crystal module is shown in fig. 11.
The structure is seven: on the basis of the sixth structure, the number of the second liquid crystal panels 102 is even, and the second liquid crystal panels are symmetrically arranged on the left and right sides of the first liquid crystal panel 101, and the whole liquid crystal module is bilaterally symmetrical by taking the center line of the first liquid crystal panel 101 (the center line is parallel to the first liquid crystal panel 101 and the second liquid crystal panel 102) as a symmetry axis. Taking the number of the second liquid crystal panels 102 as four as an example, two second liquid crystal panels 102 are respectively spliced on two sides of the first liquid crystal panel 101 in sequence, and the top view of the liquid crystal module is shown in fig. 12.
The structure eight: with the first liquid crystal panel 101 as a center, the first liquid crystal panel 101 is disposed at the bottom of the liquid storage tank 3, and the light emitting surface of the first liquid crystal panel 101 is parallel to the bottom of the liquid storage tank 3, and the first liquid crystal panel 101 is an N-sided polygon. The number of the second liquid crystal screens 102 is N, each second liquid crystal screen 102 is correspondingly spliced on one side of the first liquid crystal screen 101, the two second liquid crystal screens 102 spliced on the adjacent edges of the first liquid crystal screen 101 are spliced with each other, a theta included angle is formed between each second liquid crystal screen 102 and the first liquid crystal screen 101, a theta included angle is formed between any two second liquid crystal screens 102, and the size of the theta included angle changes along with the distance between the liquid crystal screen 1 and the liquid storage tank 3 corresponding to the angle. In this structure, the second liquid crystal panel 102 is in a central symmetrical structure with the first liquid crystal panel 101 as a center, and the second liquid crystal panel 102 is arranged around the first liquid crystal panel 101 in a ring shape. Fig. 13 is a top view showing a possible liquid crystal module structure, in which the first liquid crystal panel 101 is a regular pentagon, the second liquid crystal panels 102 are 5, and each side of the first liquid crystal panel 101 is correspondingly spliced with one second liquid crystal panel 102. The first liquid crystal panel 101 and any one of the second liquid crystal panels 102 form an included angle theta, and any two second liquid crystal panels 102 connected with each other form an included angle theta.
The structure is nine: on the basis of the eighth structure, a circle of second liquid crystal screens 102 butted with the first liquid crystal screens 101 is used as a first layer structure, the third liquid crystal screens 103 are continuously spliced and surrounded outside the first layer structure in a mode that the second liquid crystal screens 102 are spliced with the first liquid crystal screens 101, theta included angles are formed between the second liquid crystal screens 102 and the third liquid crystal screens 103 which are randomly connected and between the third liquid crystal screens 103 and the third liquid crystal screens 103, and the theta included angles are changed along with the distance between the liquid crystal screens 103 and the liquid storage tank 3 corresponding to the theta included angles. On the basis of the first liquid crystal screen 101 with the pentagonal structure shown in the eighth structure, as shown in fig. 14, in the top view of the liquid crystal module, the third liquid crystal screen 103 is spliced at the edge of the second liquid crystal screen 102 departing from the first liquid crystal screen 101, the second liquid crystal screen 102 corresponds to the third liquid crystal screen 103 one by one, any group of the second liquid crystal screen 102 spliced with each other forms a theta included angle with the third liquid crystal screen 103, and any two connected third liquid crystal screens 103 form a theta included angle.
Mode two
The liquid crystal module includes a first liquid crystal panel 101 and a second liquid crystal panel 102. The first liquid crystal screen 101 and the second liquid crystal screen 102 correspond to the respective backlight assembly 2, under the irradiation of a light source of the backlight assembly 2, the first liquid crystal screen 101 and the second liquid crystal screen 102 respectively correspond to a part of a preset pattern, and the patterns displayed by the first liquid crystal screen 101 and the second liquid crystal screen 102 are seamlessly spliced together to form a complete preset pattern. The first liquid crystal panel 101 and the second liquid crystal panel 102 are symmetrically arranged with a plane perpendicular to the bottom of the liquid storage tank 3 as a symmetry plane. The first liquid crystal display 101 and the second liquid crystal display 102 are both arranged at the bottom of the liquid storage tank 3, and an included angle theta is formed between the first liquid crystal display 101 and the second liquid crystal display. The specific structure is exemplified as follows.
The structure I is as follows: as shown in fig. 15, the first liquid crystal panel 101 and the second liquid crystal panel 102 form a liquid crystal module and a liquid storage tank 3, the first liquid crystal panel 101 and the second liquid crystal panel 102 are arranged at the bottom of the liquid storage tank 3in a bilateral symmetry manner, the first liquid crystal panel 101 is set as the liquid crystal panel 1 on the left side of the symmetry plane, and the second liquid crystal panel 102 is set as the liquid crystal panel 1 on the right side of the symmetry plane. According to the positional relationship among the first liquid crystal panel 101, the second liquid crystal panel 102 and the liquid storage tank 3, a trigonometric function relation graph of light rays as shown in fig. 16 is obtained, where s is a frame width of the first liquid crystal panel 101 or the second liquid crystal panel 102, d is a distance between a direction perpendicular to the first liquid crystal panel 101 and a front portion of the bottom of the liquid storage tank 3, and a direction perpendicular to the second liquid crystal panel 102, and a distance between a direction perpendicular to the second liquid crystal panel 102 and a front portion of the bottom of the liquid storage tank 3, and a direction perpendicular to the first liquid crystal panel 101, and a direction perpendicular to the display area 11 (i.e., a direction perpendicular to the first liquid crystal panel 101, and a distance between the frame 12 and a front portion of the bottom of the liquid storage tank 3, are obtained. It can be seen that two symmetric right-angled triangles with equal size are formed between the first liquid crystal panel 101, the second liquid crystal panel 102 and the bottom of the liquid storage tank 3, and the symmetric axis is the hypotenuse of the right-angled triangle. Light rays emitted by the edge, close to the second liquid crystal screen 102, of the display area 11 of the first liquid crystal screen 101 and light rays emitted by the edge, close to the first liquid crystal screen 101, of the display area 11 of the second liquid crystal screen 102 converge at a point O at the bottom of the liquid storage tank 3, so that a printing blind area which is possibly formed when the frame 12 of the first liquid crystal screen 101 and the frame 12 of the second liquid crystal screen 102, corresponding to the point S, are shot into the liquid storage tank 3 is eliminated, and light rays, displayed by the first liquid crystal screen 101 and the second liquid crystal screen 102, shot into the liquid storage tank 3 can form a preset complete pattern in the liquid storage tank 3.
In this embodiment, the first liquid crystal panel 101 and the second liquid crystal panel 102 are symmetrical and form images completely in a consistent manner, so that the problem of inconsistent image formation of the two liquid crystal panels 1 is avoided. In addition, because the liquid crystal screens 1 are all obliquely arranged, an angle exists between the light of the liquid crystal screens 1 and the bottom of the liquid storage tank 3 when the light is emitted into the liquid storage tank 3, optical path difference exists between the light emitted from each position of the liquid crystal screens 1 at the bottom of the liquid storage tank 3 to cause imaging change, and algorithm compensation processing is performed on display images of the liquid crystal screens 1 at a host computer end in advance before imaging in order to realize complete undistorted printing of the images. The algorithm compensation processing can adopt a local trimming algorithm or a simpler mode of setting equal-proportion gray scale through different area graphs so as to compensate the curing intensity difference caused by the optical path difference. However, in practical use, θ in the diagram 16 is very close to 180 °, that is, the inclination angle of the bottom of the liquid storage tank 3 of the liquid crystal panel 1 is very small, and the influence thereof can be ignored.
The structure II is as follows: on the basis of the first structure, the liquid crystal module further comprises at least one first auxiliary liquid crystal screen 1011 spliced with the first liquid crystal screen 101. As shown in fig. 17, when the number of the first auxiliary liquid crystal panels 1011 is one, the first auxiliary liquid crystal panels 1011 are spliced on one side of the first liquid crystal panel 101 away from the second liquid crystal panel 102, and an included angle θ 'is formed between the first auxiliary liquid crystal panels 1011 and the first liquid crystal panel 101, light rays at respective edges of the first liquid crystal panel 101 and the first auxiliary liquid crystal panels 1011 converge at a point O' at the bottom of the liquid storage tank 3; when the number of the first auxiliary liquid crystal screens 1011 is more than one, the first auxiliary liquid crystal screens 1011 are sequentially spliced with one side, away from the second liquid crystal screen 102, of the first liquid crystal screen 101, an included angle theta is formed between any two first auxiliary liquid crystal screens 1011, and the size of the included angle theta changes along with the distance between the corresponding liquid crystal screen 1 and the corresponding liquid storage tank 3.
The structure is three: corresponding to the second structure, on the basis of the first structure, the liquid crystal module further includes at least one second auxiliary liquid crystal panel 1021 spliced with the second liquid crystal panel 102. As shown in fig. 18, when the number of the second auxiliary lcd panels 1021 is one, the second auxiliary lcd panels 1021 are spliced on one side of the second lcd panel 102 away from the first lcd panel 101, and an included angle θ 'is formed between the second auxiliary lcd panel 1021 and the second lcd panel 102, and the light rays at the respective edges of the first lcd panel 101 and the first auxiliary lcd panel 1011 converge at the point O' at the bottom of the liquid storage tank 3; when the number of the second auxiliary liquid crystal screens 1021 is more than one, each second auxiliary liquid crystal screen 1021 is spliced with one side, away from the first liquid crystal screen 101, of the second liquid crystal screen 102 in sequence, an included angle theta is formed between any two second auxiliary liquid crystal screens 1021, and the size of the angle theta changes along with the distance between the corresponding liquid crystal screen 1 and the corresponding liquid storage tank 3.
The structure is four: as shown in fig. 19, the lcd module further includes a first auxiliary lcd panel 1011 and a second auxiliary lcd panel 1021. The first auxiliary lcd screen 1011 is spliced on one side of the first lcd screen 101 far away from the second lcd screen 102, an included angle θ' is formed between the first auxiliary lcd screen 1011 and the first lcd screen 101, and a top view of the lcd module with the structure is shown in fig. 20. The light rays at the edges of the first liquid crystal screen 101 and the first auxiliary liquid crystal screen 1011 converge at the point O' at the bottom of the liquid storage tank 3; the second auxiliary liquid crystal screen 1021 is spliced on one side, far away from the first liquid crystal screen 101, of the second liquid crystal screen 102, a theta 'included angle is formed between the second auxiliary liquid crystal screen 1021 and the second liquid crystal screen 102, and light rays at the edges of the first liquid crystal screen 101 and the first auxiliary liquid crystal screen 1011 converge at an O' point at the bottom of the liquid storage tank 3.
The structure is five: on the basis of the fourth structure, the number of the first auxiliary liquid crystal screens 1011 is multiple, the first auxiliary liquid crystal screens 1011 are sequentially spliced on one side, away from the second liquid crystal screen 102, of the first liquid crystal screen 101, an included angle theta is formed between any two first auxiliary liquid crystal screens 1011, and the size of the included angle theta changes along with the distance between the corresponding liquid crystal screen 1 and the corresponding liquid storage tank 3. As shown in fig. 21, which is a plan view showing one specific structure, the number of the first auxiliary liquid crystal panels 1011 is two.
The structure is six: corresponding to the fifth structure, the number of the second auxiliary liquid crystal screens 1021 is multiple, the second auxiliary liquid crystal screens 1021 is sequentially spliced on one side, away from the first liquid crystal screen 101, of the second liquid crystal screen 102, an included angle theta is formed between any two second auxiliary liquid crystal screens 1021, and the size of the included angle theta changes along with the distance between the corresponding liquid crystal screen 1 and the corresponding liquid storage tank 3. The liquid crystal module structure in this configuration is similar to that in configuration five, and the drawings are omitted.
The structure is seven: on the basis of the fourth structure, the number of the first auxiliary liquid crystal screens 1011 and the number of the second auxiliary liquid crystal screens 1021 are multiple, the first auxiliary liquid crystal screens 1011 are sequentially spliced on one sides, away from the second liquid crystal screen 102, of the first liquid crystal screens 101, an included angle theta is formed between any two first auxiliary liquid crystal screens 1011, and the size of the included angle theta is changed along with the distance between the corresponding liquid crystal screen 1 and the corresponding liquid storage tank 3; the second auxiliary liquid crystal screens 1021 are sequentially spliced on one sides, far away from the first liquid crystal screen 101, of the second liquid crystal screens 102, an included angle theta is formed between any two second auxiliary liquid crystal screens 1021, and the size of the included angle theta changes along with the distance between the corresponding liquid crystal screen 1 and the corresponding liquid storage tank 3.
The structure eight: on the basis of the seventh structure, the number of the first auxiliary liquid crystal screens 1011 and the number of the second auxiliary liquid crystal screens 1021 are the same, and the first auxiliary liquid crystal screens 1011 and the second auxiliary liquid crystal screens 1021 are symmetrical about a plane perpendicular to the bottom of the liquid storage tank 3. Taking the number of the first auxiliary lcd screen 1011 and the second auxiliary lcd screen 1021 as an example, as shown in fig. 22, the first auxiliary lcd screen 1011 is sequentially spliced on the side of the first lcd screen 101 away from the second lcd screen 102, and the second auxiliary lcd screen 1021 is sequentially spliced on the side of the second lcd screen 102 away from the first lcd screen 101.
Example two
In this embodiment, the structure of the liquid crystal module in this embodiment is improved, so that the light rays of the display patterns of the adjacent liquid crystal panels 1 are seamlessly spliced into the preset pattern when entering the liquid storage tank 3. Specifically, the light emitting surface of the liquid crystal module is parallel to the bottom of the liquid storage tank 3, and in any two connected liquid crystal screens 1, one side of the light emitting surface of at least one liquid crystal screen 1 is correspondingly provided with a lens assembly. Here, the lens component is used for changing the path of the light emitted by the liquid crystal panel 1, so that the light displayed on the edges of the two liquid crystal panels 1 connected can be converged at one point at the bottom of the liquid storage tank 3, and finally, the complete splicing of the patterns in the liquid storage tank 3 is realized.
Specifically, the lens assembly includes a biconvex lens 62 and a concave lens 61 arranged in this order from the reservoir 3 toward the liquid crystal panel 1. The concave lens 61 diffuses the light emitted by the liquid crystal screen 1 to enlarge the image displayed by the liquid crystal screen 1 so as to occupy the display blind area corresponding to the frame 12 of the liquid crystal screen 1; the biconvex lens 62 converges the diverged light so that the light is incident into the resin tank from the bottom of the liquid storage tank 3in a direction perpendicular to the bottom of the liquid storage tank 3. By reasonably arranging the lens component, a display blind area which is possibly formed by the display frame 12 can be eliminated, so that the patterns displayed by the liquid crystal screens 1 can be spliced into a complete preset pattern in the liquid storage tank 3.
The arrangement between the lens assembly and the liquid crystal module can be in the following manners.
In a first mode
In any two adjacent liquid crystal screens 1, a lens assembly is correspondingly arranged on one side of the light-emitting surface of one of the liquid crystal screens 1, and the following relationship exists between the focal lengths of the double-sided convex lens 62 and the concave lens 61:
wherein f is1Is the focal length of the concave lens 61, f2The focal length of the lenticular lens 62 is shown, L is the length of the display area 11 of one liquid crystal screen 1 perpendicular to the splicing line between two liquid crystal screens 1, and s is the width of the frame of the liquid crystal screen 1.
As shown in fig. 23, two liquid crystal panels 1 are arranged in a set, the liquid crystal panel 1 on the left side is a first liquid crystal panel 101, and the liquid crystal panel 1 on the right side is a second liquid crystal panel 102. Wherein, the first liquid crystal screen 101 is correspondingly provided with a lens assembly, and the focal length in the lens assembly is f1The concave lens 61 enlarges the pattern displayed on the first liquid crystal panel 101 by a focal length f2The biconvex lens 62 converges the light transmitted by the concave lens 61 to make the light vertically incident into the liquid storage tank 3, and the light emitted by the second liquid crystal screen 102 and the image in the liquid storage tank 3 are spliced seamlessly.
In this embodiment, the image displayed on the first lcd 101 is enlarged, and the image displayed on the second lcd 102 is also the original image, and the two images projected into the liquid storage tank 3 are asymmetric, so that the image to be displayed on the first lcd 101 needs to pass through before projection
And (5) reducing the magnification.
The arrangement of the lens assembly between the second lcd panel 102 and the bottom of the liquid storage tank 3 is shown in fig. 24. Similarly, since the image displayed on the second lcd panel 102 is enlarged and the image displayed on the first lcd panel 101 is also the original image, the images projected into the liquid storage tank 3 will be asymmetric, so that the image displayed on the second lcd panel 102 needs to pass through before projection
And (5) reducing the magnification.
Mode two
The light-emitting side of each liquid crystal screen 1 is correspondingly provided with a lens component, and the following relationship exists between the double-sided convex lens 62 and the concave lens 61:
wherein f is1Is the focal length of the concave lens 61, f2The focal length of the lenticular lens 62 is shown, L is the length of the display area 11 of one liquid crystal screen 1 perpendicular to the splicing line between two liquid crystal screens 1, and s is the width of the frame of the liquid crystal screen 1.
As shown in fig. 25, taking a liquid crystal module formed by two liquid crystal panels 1 connected to each other as an example, a lens assembly is disposed between each liquid crystal panel 1 and the bottom of the liquid storage tank 3. The images of the light rays emitted by the two liquid crystal screens 1 and entering the liquid storage tank 3 are spliced seamlessly.
It should be noted that, in fig. 23 to fig. 25, each liquid crystal panel has its own backlight assembly, but the embodiment of the present invention is not limited to this, and in other embodiments, each liquid crystal panel may share one backlight assembly.
Based on the same inventive concept, the present embodiment further provides a 3D printing system, which includes a rack, a liquid storage tank 3, a molding supporting plate 5, and any one of the light source devices provided in the above embodiments; the liquid storage tank 3 is arranged on the frame, and liquid photosensitive resin 4 is loaded in the liquid storage tank 3; the light source device is arranged on the frame and is positioned below the bottom of the liquid storage tank 3; the forming supporting plate 5 is movably arranged on the rack and located above the liquid storage tank 3, and the forming supporting plate 5 can move in or out of the liquid storage tank 3 along the vertical direction so that the liquid photosensitive resin 4 is cured and formed on the forming supporting plate 5 under the illumination effect of the light source device.
It should be noted that, in the description of the drawings provided in the embodiment of the present invention, the structures other than the structure of the light source device are merely illustrated as structural examples, and the size or the position shown in the drawings does not correspond to the actual working state, for example, the position and the size of the forming pallet 5 relative to the liquid storage tank 3 and the liquid crystal module in the drawings are merely illustrated as examples, in the actual working, for different articles to be printed, the position and the size of the relevant structure need to be adaptively adjusted, so that the light emitted by the light source device is emitted into the liquid storage tank 3 at a proper position, so that the liquid photosensitive resin 4 in the liquid storage tank 3 is formed on the forming pallet 5 according to the pattern, and the 3D printing is completed.
It will be apparent to those skilled in the art that various changes and modifications may be made in the embodiments of the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (8)
1. A light source device, comprising: a backlight assembly and a liquid crystal module;
the light emitting surface of the backlight assembly faces the bottom of a liquid storage tank in the 3D printing system;
the liquid crystal module comprises at least two liquid crystal screens which are sequentially spliced and arranged on one side of the light emitting surface of the backlight assembly and used for guiding the light rays emitted by the backlight assembly to the bottom of the liquid storage tank;
the widths of the frames of any two connected liquid crystal screens in the liquid crystal module are the same, and,
the light emergent surfaces of the two liquid crystal screens form an included angle theta, wherein,
and the s is the width of the frame of the liquid crystal screen, and the d is the distance between the edge of the frame spliced by the liquid crystal screen and the bottom of the liquid storage tank along the direction vertical to the liquid crystal screen, wherein the edge is adjacent to the display area.
2. The light source device according to claim 1, wherein the liquid crystal module comprises a first liquid crystal panel parallel to the bottom of the liquid storage tank and at least a second liquid crystal panel sequentially spliced around the first liquid crystal panel.
3. The light source device according to claim 2, wherein the second liquid crystal panels are plural, and the plural second liquid crystal panels are arranged in a central symmetrical structure with the first liquid crystal panel as a center.
4. The light source device according to claim 1, wherein the liquid crystal module comprises a first liquid crystal panel and a second liquid crystal panel;
the first liquid crystal screen and the second liquid crystal screen are symmetrically arranged by taking a plane perpendicular to the bottom of the liquid storage tank as a symmetrical plane.
5. The light source device according to claim 4, wherein the liquid crystal module further comprises at least a first auxiliary liquid crystal panel spliced with the first liquid crystal panel;
and/or the presence of a gas in the gas,
the liquid crystal module further comprises at least one second auxiliary liquid crystal screen spliced with the second liquid crystal screen.
6. The light source device according to claim 5, wherein the number of the first auxiliary liquid crystal panels is plural, and the plural first auxiliary liquid crystal panels are sequentially spliced on one side of the first liquid crystal panel away from the second liquid crystal panel;
and/or the presence of a gas in the gas,
the second auxiliary liquid crystal screens are multiple and sequentially spliced on one side, away from the first liquid crystal screen, of the second liquid crystal screen.
7. The light source device according to claim 6, wherein the first auxiliary liquid crystal panels and the second auxiliary liquid crystal panels are both provided in plurality, and the plurality of first auxiliary liquid crystal panels and the plurality of second auxiliary liquid crystal panels are symmetrically disposed about a plane perpendicular to a bottom of the liquid storage tank.
8. A3D printing system, comprising: a rack, a liquid storage tank, a molding pallet and the light source device according to any one of claims 1 to 7;
the liquid storage tank is arranged on the rack and filled with liquid photosensitive resin;
the light source device is arranged on the rack and is positioned below the bottom of the liquid storage tank;
the forming supporting plate is movably arranged on the rack and located above the liquid storage tank, and the forming supporting plate can move in or out of the liquid storage tank along the vertical direction, so that the liquid photosensitive resin is cured and formed on the forming supporting plate under the illumination effect of the light source device.
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| CN104786509B (en) * | 2015-05-15 | 2018-09-04 | 京东方科技集团股份有限公司 | 3D printer and its projection arrangement |
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