CN112721484B - Printing method and printing equipment applied to grating projection curtain - Google Patents

Printing method and printing equipment applied to grating projection curtain Download PDF

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Publication number
CN112721484B
CN112721484B CN202011638859.7A CN202011638859A CN112721484B CN 112721484 B CN112721484 B CN 112721484B CN 202011638859 A CN202011638859 A CN 202011638859A CN 112721484 B CN112721484 B CN 112721484B
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curtain
printing
grating
nozzle
projection
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CN112721484A (en
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覃勇
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Dongguan Tuchuang Intelligent Manufacturing Co Ltd
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Dongguan Tuchuang Intelligent Manufacturing Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
    • B41M3/003—Printing processes to produce particular kinds of printed work, e.g. patterns on optical devices, e.g. lens elements; for the production of optical devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/0082—Digital printing on bodies of particular shapes
    • B41M5/0088—Digital printing on bodies of particular shapes by ink-jet printing
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/18—Diffraction gratings
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/54—Accessories
    • G03B21/56—Projection screens
    • G03B21/60—Projection screens characterised by the nature of the surface
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T17/00—Three dimensional [3D] modelling, e.g. data description of 3D objects

Abstract

The invention belongs to the technical field of ink-jet printing, solves the problem of low grating preparation efficiency in the prior art, and provides a printing method and printing equipment applied to a grating projection curtain. The printing method and the printing equipment applied to the grating projection curtain comprise the following steps: acquiring the printing precision of the grating in the first direction of the curtain; obtaining an inclination angle of the orthographic projection of the nozzle row on the nozzle on the curtain surface relative to the first direction according to the printing precision; and controlling the spray head to perform ink jet printing on the grating on the surface of the curtain according to the inclination angle. The invention adopts the spray head to perform ink jet printing on the surface of the curtain to print the grating, and compared with the existing grating manufacturing method, the invention obviously improves the printing efficiency.

Description

Printing method and printing equipment applied to grating projection curtain
Technical Field
The invention belongs to the technical field of ink-jet printing, and particularly relates to a printing method and printing equipment applied to a grating projection curtain.
Background
The long-focus grating projection curtain is used in film, office, home cinema, large conference and other places, and is used as light source carrier for displaying characters, images and videos. The existing grating projection curtain structure is shown in fig. 1 to 3, a plurality of triangular prism-shaped gratings (the size of each grating is consistent, the length of each grating is L, the width of each grating is B, and the thickness of each grating is H) are arranged on the curtain, the inclined edges of the gratings are black, and ambient light irradiates on the inclined edges of the gratings and can be absorbed by the inclined edges of the gratings, so that the projection effect of the curtain is improved, and the characteristics of a projector are fully exerted.
The existing manufacturing method of the grating projection curtain adopts a grating mould with a plurality of grooves on the outer circumferential surface to extrude a grating sheet, so as to manufacture a sheet plate with a front surface being a cylindrical lens and a back surface being smooth. The production method is generally directed at the processing and manufacturing of the whole plate, and due to the characteristics of manufacturing the grating die, the method can only produce the grating sheet with single line width and linear density, and when the grating sheet with different line widths and linear densities needs to be manufactured, the corresponding grating die needs to be replaced, so that the processing is inconvenient; moreover, the grating mold surface and the tiny grooves thereof have high precision requirement during manufacturing, the production cost and the maintenance cost of the grating mold are high, the production cost is also high, and the grating mold is not practical for manufacturing a plurality of corresponding grating molds according to the local lenticular area.
Disclosure of Invention
In view of the above, the present invention provides a printing method and a printing apparatus applied to a raster projection curtain, so as to solve the problem of low efficiency in preparing a raster in the prior art.
The technical scheme adopted by the invention is as follows:
in a first aspect, the present invention provides a printing method applied to a raster projection curtain, where the printing method applied to the raster projection curtain includes the following steps:
acquiring the printing precision of a grating in a first direction of a curtain;
obtaining an inclination angle of the orthographic projection of the nozzle row on the nozzle on the curtain surface relative to the first direction according to the printing precision;
and controlling the spray head to perform ink jet printing on the grating on the surface of the curtain according to the inclination angle.
As a preferable mode of the method, the obtaining of the inclination angle of the orthographic projection of the nozzle rows on the spray head on the curtain surface compared with the first direction according to the printing precision includes:
calculating the distance S1 between the centers of two adjacent ink dots in the first direction according to the printing precision of the grating in the first direction of the curtain;
acquiring the distance S2 between two adjacent nozzles on the same row of nozzle rows on the spray head;
and taking the length value as the side of the S2 as the hypotenuse of the right triangle, taking the length value as the side of the S1 as a right-angle side of the right triangle, and taking the calculated included angle between the hypotenuse and the right-angle side as the inclination angle.
As a preferable scheme of the method, the printing method applied to the raster projection curtain comprises the following steps:
acquiring the width of the curtain and the printing precision of the grating in the first direction of the curtain;
calculating the movement width of the orthographic projection of the spray head to the first direction of the curtain according to the width of the curtain;
acquiring an inclination angle of the orthographic projection of the nozzle row on the nozzle on the surface of the curtain compared with the first direction according to the printing precision;
and controlling the spray head to perform ink jet printing on the grating on the surface of the curtain according to the inclination angle.
As a preferable mode of the method, the movement width D = D1+ D2+ D3+ D4 of the head orthographic projection in the first direction of the curtain, where D1 is the length of the curtain in the first direction, D2 is the acceleration and deceleration distance of the head, D3 is the width of the inkjet printing apparatus in the first direction, and D4 is the length of the inspection position of the inkjet printing apparatus.
As a preferable scheme of the method, the controlling the spray head to perform ink jet printing on the grating on the surface of the curtain comprises the following steps:
acquiring a three-dimensional model of the grating;
slicing the three-dimensional model of the grating to obtain a plurality of sliced layers, and generating printing data corresponding to each sliced layer one by one;
and sequentially printing each cut sheet layer in an ink jet mode on the surface of the curtain according to the printing data corresponding to each cut sheet layer one to one.
As a preferable scheme of the method, in the process of ink-jet printing of two adjacent cut sheet layers, the movement directions of the spray heads relative to the curtain are opposite.
As a preferable mode of the above method, after each of the cut layers is inkjet printed on the surface of the curtain in sequence, each of the cut layers is cured.
As a preferable scheme of the method, the printing method applied to the raster projection curtain comprises the following steps:
acquiring the width of a curtain, the printing precision of a grating in a first direction of the curtain and a three-dimensional model of the grating;
calculating the number of rows of the spray heads arranged along the first direction of the curtain according to the three-dimensional model of the grating;
calculating the movement width of the nozzle orthographic projection to the curtain in the first direction according to the width of the curtain;
obtaining an inclination angle of the orthographic projection of the nozzle row on the nozzle on the curtain surface relative to the first direction according to the printing precision;
and controlling the spray head to perform ink jet printing on the grating on the surface of the curtain according to the inclination angle. Breadth width
As a preferable scheme of the method, the calculating the number of rows of the nozzles arranged in the first direction according to the three-dimensional model of the grating includes the following steps:
calculating the number N of total slicing layers according to the three-dimensional model of the grating, wherein N is an integer greater than 1;
the number of rows of nozzles arranged in the first direction is equal to the total number of slice layers N.
In a second aspect, the present invention provides a printing apparatus for printing a raster projection screen by any one of the above methods, comprising a nozzle head, wherein the nozzle rows of the nozzle head are orthographically projected onto the screen surface and have the inclination angle with respect to the first direction of the screen.
In conclusion, the beneficial effects of the invention are as follows:
in the printing method and the printing equipment applied to the grating projection curtain, provided by the embodiment of the invention, the spray head is adopted to perform ink jet printing on the surface of the curtain, so that the printing efficiency is obviously improved compared with the existing grating manufacturing method. Meanwhile, in the embodiment, the printing precision of the spray head is improved by changing the inclination angle of the spray head.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly described below, and for those skilled in the art, without any creative effort, other drawings may be obtained according to the drawings, and these drawings are all within the protection scope of the present invention.
Fig. 1 is a schematic structural diagram of a conventional medium-and long-focus projection curtain;
FIG. 2 is a left side view of FIG. 1;
FIG. 3 is an enlarged view of a portion of FIG. 2 at A;
fig. 4 is a flowchart of a printing method applied to a raster projection curtain in embodiment 1 of the present invention;
FIG. 5 is a schematic view of the ink-jet printing apparatus, the curtain and the printing platform according to embodiment 2 of the present invention;
FIG. 6 is a partial enlarged view of FIG. 5 at B;
FIG. 7 is a bottom view of FIG. 6;
FIG. 8 shows a graph S in example 2 of the present invention 2 As hypotenuse of triangle, with S 1 The structural schematic diagram of a right-angled triangle formed by the right-angled sides of the triangle;
FIG. 9 is a schematic view of the ink-jet printing apparatus, the curtain and the printing platform according to embodiment 3 of the present invention;
FIG. 10 is a flowchart of ink-jet printing gratings on the surface of a curtain along a first direction by a nozzle in embodiment 4 of the present invention;
FIG. 11 is a schematic diagram of a grating structure in embodiment 5 of the present invention;
FIG. 12 is a cross-sectional view at C-C of FIG. 11;
FIG. 13 is a cross-sectional view taken at D-D of FIG. 11;
FIG. 14 is a schematic view of an inkjet printing apparatus, a curtain, and a printing platform according to embodiment 8 of the present invention;
fig. 15 is a schematic structural view of an inkjet printing apparatus according to embodiment 9 of the present invention.
Parts and numbering in the drawings:
100. an inkjet printing device; 110. a spray head; 111. a nozzle; 112. a first nozzle; 113. a second nozzle; 120. a rotation mechanism; 121. a first rotation arm; 122. a second rotating arm; 123. a motion bar; 124. a first lead screw; 125. a first lead screw nut; 126. a second screw rod; 127. a second feed screw nut; 200. a printing platform; 400. a grating projection curtain; 410. a curtain; 420. a grating; 431. a first dot; 432. a second dot; 500. ambient light;
the direction of arrow A is a first direction, D 1 Is a curtainLength in the first direction, D 21 For acceleration distance of the spray head, D 22 Deceleration distance, D 3 Width of the ink-jet printing apparatus in the first direction, D 4 The length of the maintenance position of the ink-jet printing device, L is the length of the grating, B is the width of the grating, H is the height of the grating, alpha is the inclination angle of the spray head, and S 1 Distance between two adjacent ink dot centers in the first direction, S 2 The distance between two adjacent nozzles on the same row of nozzle rows on the nozzle is defined.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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. It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising 8230; \8230;" 8230; "does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element. In case of conflict, the embodiments of the present invention and various features of the embodiments may be combined with each other within the scope of the present invention.
Example 1
Referring to fig. 4, an embodiment 1 of the present invention discloses a printing method applied to a raster projection curtain, where the printing method applied to the raster projection curtain includes the following steps:
s1, obtaining the printing precision of a grating in a first direction of a curtain;
s2, acquiring an inclination angle of the orthographic projection of the nozzle row on the spray head on the surface of the curtain, which is compared with the first direction, according to the printing precision;
and S3, controlling the spray head to perform ink jet printing on the grating on the surface of the curtain according to the inclination angle.
The first direction is the moving direction of the spray head relative to the curtain.
In the embodiment, the spray head is adopted to print the grating on the surface of the curtain in an ink-jet mode, and compared with the existing grating manufacturing method, the printing efficiency is obviously improved. Meanwhile, in the embodiment, the printing precision of the spray head is improved by changing the inclination angle of the spray head.
Example 2
The printing method applied to the raster projection curtain in embodiment 2 of the invention is improved on the basis of embodiment 1. Specifically, the step S2 of this embodiment of calculating the inclination angle of the orthographic projection of the nozzle row on the nozzle on the curtain surface relative to the first direction according to the printing precision specifically includes the following steps:
s21, calculating the distance S between the centers of two adjacent ink dots in the first direction according to the printing precision of the raster in the first direction of the curtain 1 ；
S22, obtaining the distance S between two adjacent nozzles on the same row of nozzle rows on the spray head 2 ；
S23, taking the length value as the S 2 The side of (A) is taken as the hypotenuse of the right triangle, and the length value is taken as the S 1 The calculated included angle between the hypotenuse and the right-angle side is taken as the inclination angleα。
For the convenience of understanding, the printing precision is 1200DPI, and the method is exemplified by adopting an Epson 5113 spray head, wherein the Epson 5113 spray head is provided with 8 rows of spray holes, each row of spray holes is provided with 40 spray holes, and the center distance S between every two adjacent spray heads in each row of spray holes 1 0.08mm as shown in fig. 5. An inclination angle α of the orthographic projection of the nozzle row on the nozzle head on the curtain surface relative to the first direction is calculated by taking one row of spray holes of the epressen 5113 nozzle as an example:
from the printing accuracy 1200DPI it can be calculated that when two adjacent dots are assumed to be tangent, it can be calculated that there are 1200 dots in every 25.4mm on the screen surface, and the diameter of each dot =25.4 ÷ 1200=0.0212mm, and since the dots are tangent, the center-to-center distance between two adjacent dots is 0.0212. Then to make the ink jet printed by two adjacent nozzles satisfy 1200DPI, it will be printed with S 2 As hypotenuse of triangle, with S 1 The angle of the included angle calculated as the right-angle side of the triangle is the inclination angle α = arccos (0.0212 ÷ 0.08) =74.69 ° of the orthographic projection of the nozzle row on the surface of the curtain compared with the first direction on the spray head. After the plurality of nozzles are spliced by inclining 74.69 degrees, as shown in fig. 6 and 7, the projections of the ink printed by the nozzles in the first direction can be tangent (for example, the projection of the first ink point ejected by the first nozzle and the projection of the second ink point ejected by the second nozzle in the first direction are tangent), so that the nozzles in the first direction meet the printing precision of 1200DPI, and the printing precision is improved.
Example 3
Referring to fig. 9, the printing method applied to the raster projection curtain in embodiment 3 of the present invention is improved based on embodiment 1. Specifically, in step S2 of this embodiment, the movement width D = D of the nozzle orthographic projection in the first direction of the curtain is calculated according to the width of the curtain 1 +D 2 +D 3 +D 4 Wherein D is 1 Is the length of the curtain in the first direction, D 2 For acceleration or deceleration of the nozzle, D 3 Width of the ink-jet printing apparatus in the first direction, D 4 For the length of the maintenance position of the ink-jet printing apparatusThe printing device is provided with a spray head. The conventional sizes of the existing curtain are 100 inches, 120 inches, 150 inches, 180 inches, 200 inches and the like, and in the embodiment, the curtain with the size of 180 is taken as an example for explanation, and the following steps are performed according to 16: the projection ratio of 9, the length and width of 180 inches are: 3985mm × 2242mm, in the embodiment, the length direction of the curtain is parallel to the first direction, and the length D of the curtain in the first direction 1 3985mm. The acceleration distance D of the nozzle in this embodiment 21 Is 250mm, and the speed reduction distance D of the spray head 22 At 250mm, the nozzle is accelerated or decelerated by a distance D 2 = D 21 +D 22 =500mm, width D of inkjet printing apparatus 3 Is 200mm, length D of the maintenance position of the ink-jet printing device 4 300mm, the width of the movement of the nozzle orthographically projected to the first direction of the curtain in this embodiment, D =4985mm.
Example 4
Referring to fig. 10, the printing method applied to the raster projection curtain in embodiment 4 of the present invention is improved based on embodiment 1. Specifically, the inkjet printing of the raster on the surface of the curtain in this embodiment includes the following steps:
s41, acquiring a three-dimensional model of the grating;
s42, slicing the three-dimensional model of the grating to obtain a plurality of sliced layers, and generating printing data corresponding to each sliced layer one by one;
and S43, sequentially carrying out ink jet printing on each cut layer on the surface of the curtain according to the printing data corresponding to each cut layer one by one.
Example 5
The printing method applied to the raster projection curtain in embodiment 5 of the present invention is improved on the basis of embodiment 4. Specifically, the three-dimensional model of the grating in this embodiment includes the length L, the width B, and the height H of the grating. In this embodiment, the plurality of nozzles are spliced into a row of nozzles along a direction perpendicular to the first direction, and the length of the row of nozzles in the direction perpendicular to the first direction is greater than the length L of the raster, so that the inkjet printing apparatus performs printing of the next slice layer image on the medium by moving once along the first direction.
For ease of understanding, a specific step of printing a raster on a curtain will now be described, where the raster structure is shown in fig. 11, and the specific steps are as follows:
s41, receiving the length L, the width B and the height H of the three-dimensional model of the grating;
s42, calculating the total slicing layer number N = H/q according to the three-dimensional model of the grating, wherein H is the height of the grating, and q is the thickness of the ink dots (the grating is divided into N layers along the height direction in fig. 11, and the N layers are represented;
s43, calculating an image of a first cut layer (the lowest layer) according to the three-dimensional model of the grating, wherein the length of the first layer of the printed image is L, and the width of the first layer of the printed image is B 1 =B-Bs(N 1 -1)/H，（B 1 、N 1 Is a variable, when N 1 Is 1, so at this time B 1 =B）；
S44, ink-jet printing the image of the first cut layer on the surface of the curtain, that is, printing the image of the rectangular first cut layer on the surface of the curtain according to the size of length L and width B, as shown in fig. 12;
s45, solidifying the image of the first cut layer on the surface of the curtain;
s46, current slicing layer number N 1 (at this time N 1 1) is not equal to N, then step S47 is entered;
s47, calculating an image of a second sliced layer (the second layer from bottom to top) according to the three-dimensional model of the grating, wherein the length of the image printed on the second layer is L, and the width of the image printed on the second layer is B 1 =B-Bs(N 1 -1)/H, (in this case N) 1 Is 2, so at this time B 1 = B-Bs/H）；
S48, ink-jet printing the image of the second cut sheet layer on the surface of the curtain, namely printing the image of the rectangular second cut sheet layer on the image of the first cut sheet layer on the surface of the curtain according to the size with the length of L and the width of (B-Bs/H), as shown in FIG. 13;
s49, solidifying the image of the second cut sheet layer on the surface of the curtain;
s410, the steps S46 to S49 are repeated until N 1 Equal to N, the printing of the raster is completed。
Example 6
The printing method applied to the raster projection curtain in embodiment 6 of the present invention is improved on the basis of embodiment 5. Specifically, in the present embodiment, the step S44 is to scan the nozzle on the surface of the curtain for the first time along the positive direction of the first direction, and the nozzle moves from the left end of the curtain to the right end of the curtain. The inkjet head prints an image of the first cut layer on the surface of the curtain during the first pass. After the first cut layer is printed, the nozzle moves to the left end of the curtain along the negative direction of the first direction.
Meanwhile, in the embodiment, step S48 is to scan the nozzle on the surface of the curtain for the second time in the positive direction of the first direction, and the nozzle moves from the left end of the curtain to the right end of the curtain. And the spray head performs ink-jet printing on the image of the second cut sheet layer on the surface of the curtain in the second scanning pass. After the second slicing layer is printed, the spray head moves to the left end of the curtain along the negative direction of the first direction. In this embodiment, the first direction is a moving direction of the nozzle relative to the curtain.
In other words, in the present embodiment, the inkjet printing process of each slice layer is completed by moving the nozzle in the positive direction of the first direction; in this embodiment, the inkjet printing process of each slice layer may also be fixed by the nozzle, and the nozzle performs inkjet printing on the surface of the curtain during the movement of the curtain in the negative direction of the first direction.
Example 7
The printing method applied to the raster projection curtain in embodiment 7 of the present invention is improved on the basis of embodiment 5. Specifically, in the present embodiment, the step S44 is to scan the nozzle on the surface of the curtain for the first time along the positive direction of the first direction, and the nozzle moves from the left end of the curtain to the right end of the curtain. The inkjet head prints an image of the first cut layer on the surface of the curtain during the first pass.
Meanwhile, in the embodiment, step S48 is to scan the nozzle on the surface of the curtain for the second time along the negative direction of the first direction, and the nozzle moves from the right end of the curtain to the left end of the curtain. And the spray head sprays ink on the surface of the curtain to print the image of the second sliced layer in the second scanning pass. After the second slicing layer is printed, the spray head moves to the left end of the curtain along the negative direction of the first direction.
That is, in the present embodiment, the moving directions of the nozzles are opposite during the inkjet printing of the two adjacent cut sheets. Of course, in this embodiment, the inkjet printing process of each slice layer may also be fixed by the nozzle, and the curtain moves in the positive/negative direction of the first direction, and the nozzle completes the printing of each slice layer on the surface of the curtain. Embodiment 7 reduces the movement of the idle stroke of the head (i.e., the movement of the idle stroke is to the left end of the curtain in the negative direction of the first direction after printing each sliced layer) compared with embodiment 6, thereby improving the printing efficiency.
Example 8
The printing method applied to the raster projection curtain in embodiment 8 of the present invention is improved based on embodiment 1. Specifically, the printing method in this embodiment 8 includes the following steps:
s1, obtaining the width and printing precision of a curtain and a three-dimensional model of a grating;
s2, calculating the number of rows of the spray heads arranged along the first direction of the curtain according to the three-dimensional model of the grating;
s3, calculating the movement width of the orthographic projection of the spray head to the first direction of the curtain according to the width of the curtain;
s4, calculating an inclination angle of the orthographic projection of the nozzle rows on each row of spray heads on the surface of the curtain, which is compared with the first direction, according to the printing precision;
and S5, oneepass ink-jet printing of the grating on the surface of the curtain.
The Oneepass ink-jet printing means that the arrangement direction of the spray heads is vertical to the movement direction of the curtain relative to the spray heads, and the curtain performs one-time relative movement with the spray heads below the spray heads and then prints patterns to be printed; the relative motion of the curtain and the spray head is continuous without pause.
In this embodiment, the step S2 of calculating, according to the three-dimensional model of the grating, the number of rows of the nozzles arranged along the first direction specifically includes:
s21, calculating the number N of total slicing layers according to the three-dimensional model of the grating, wherein N is an integer greater than 1;
and S22, arranging the spray heads with the number of lines matched with the total slicing layer number N along the first direction.
After the step S22, the arrangement structure of the rows of nozzles is as shown in fig. 14, N rows of nozzles are arranged on the inkjet printing apparatus along the first direction, and the N rows of nozzles along the negative direction of the first direction are sequentially defined as a first row of nozzles, a second row of nozzles, and a third row of nozzles \8230 \ 8230and an N row of nozzles.
In this embodiment, S5, the Onepass inkjet printing raster on the surface of the curtain specifically includes:
s51, calculating images of all the cut layers according to the three-dimensional model of the grating (calculating images of N layers of cut layers, and sequentially defining printed images of each layer as a first layer image, a second layer image and a third layer image from bottom to top' \ 8230; \ 8230; and an N layer image);
s52, controlling the spray head to move relative to the curtain along a first direction (namely, the spray head can move relative to the curtain along the first direction, and the curtain can also move relative to the spray head along the first direction), and in the moving process, transmitting the first layer of image data to a first row of spray heads, and performing ink jet printing on the first layer of image on the surface of the curtain by the first row of spray heads; transmitting the second layer of image data to a second row of nozzles, wherein the second row of nozzles jet ink on the first layer of image to print a second layer of image; transmitting the third layer image data to a third row of spray heads, wherein the third row of spray heads jet ink on the second layer image to print a third layer image \8230, the third row of spray heads jet ink on the second layer image \8230, transmitting the Nth layer image data to an Nth row of spray heads, and the Nth row of spray heads jet ink on the (N-1) th layer image to print an Nth layer image; finally, the gratings are stacked on the surface of the curtain.
The embodiment is provided with the multi-row nozzles to realize the Oneepass ink-jet printing grating projection curtain, so that the production efficiency of the grating projection curtain is further improved.
Example 9
The printing method applied to the raster projection curtain in embodiment 9 of the present invention is improved on the basis of embodiments 1 to 8. Specifically, the inclination angle between the nozzle row on the nozzle in this embodiment and the first direction is adjustable, and in this embodiment, each nozzle is connected to the inkjet printing apparatus through a rotating mechanism, as shown in fig. 15. The rotating mechanism comprises a moving rod, a first screw rod nut, a second screw rod and a second screw rod nut, wherein the first screw rod and the second screw rod are respectively arranged at two sides of the ink-jet printing device along a first direction, the axes of the first screw rod and the second screw rod are parallel to the first direction, and the first screw rod nut and the second screw rod are respectively in threaded connection with the first screw rod and the second screw rod nut; the motion rod is connected between the first lead screw nut and the second lead screw nut. And a first rotating arm is arranged at one end of each spray head, a second rotating arm is arranged at the other end of each spray head, each first rotating arm is rotatably connected to the ink-jet printing device, each second rotating arm is slidably connected to the moving rod, the second rotating arms can slide on the moving rod, each first rotating arm and each second rotating arm are arranged in parallel, and the included angle between each first rotating arm and the moving rod is (90-alpha).
The first screw rod nut and the second screw rod nut can be driven to synchronously move along the first direction by synchronously rotating the first screw rod and the second screw rod, so that the moving rod is driven to move along the first direction, the second rotating arm is driven to slide on the moving rod, the spray head and the first rotating arm are driven to rotate around a connecting point of the first rotating arm and the ink-jet printing device, and finally the inclination angle alpha between the spray nozzle row on the spray head and the first direction is adjusted. In the embodiment, the rotating mechanism can synchronously adjust the inclination angle alpha between the nozzle row on each nozzle and the first direction.
The printing method applied to the raster projection curtain in this embodiment includes the following steps:
s1, obtaining the printing precision of a grating in a first direction of a curtain;
s2, calculating an inclination angle between the nozzle row on the spray head and the first direction according to the printing precision;
s3, adjusting the inclination angle between the nozzle row on the spray head and the first direction;
and S4, controlling the spray head to perform ink jet printing on the grating on the surface of the curtain.
Example 10
The embodiment 10 of the invention discloses printing equipment for printing a grating projection curtain, which comprises a spray head, wherein a nozzle row on the spray head is orthographically projected to the surface of the curtain, and the spray head and the first direction of the curtain form the inclined angle, and the printing equipment prints the grating projection curtain by using any one of the methods in the embodiments 1 to 9.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (7)

1. A printing method applied to a raster projection curtain is characterized by comprising the following steps:
obtaining the width of the curtain and the printing precision of the grating in the first direction of the curtain;
calculating the movement width of the nozzle in the first direction of the curtain according to the width of the curtain;
obtaining an inclination angle of the orthographic projection of the nozzle row on the nozzle on the curtain surface relative to the first direction according to the printing precision;
controlling the nozzle according to the inclination angle is in the raster is printed in the inkjet on the surface of the curtain, the movement width D = D1+ D2+ D3+ D4 of the orthographic projection of the nozzle to the curtain in the first direction, wherein D1 is the length of the curtain in the first direction, D2 is the acceleration and deceleration distance of the nozzle, D3 is the width of the inkjet printing device in the first direction, and D4 is the length of the maintenance position of the inkjet printing device, and according to the printing precision, acquiring the orthographic projection of the nozzle row on the nozzle in the surface of the curtain compared with the inclination angle in the first direction comprises the following steps:
calculating the distance S between the centers of two adjacent ink dots in the first direction according to the printing precision of the raster in the first direction of the curtain 1 ；
Obtaining the distance S between two adjacent nozzles on the same row of nozzle rows on the spray head 2 ；
Taking the length value as S 2 The side of (A) is taken as the hypotenuse of the right triangle, and the length value is taken as the S 1 The calculated included angle between the inclined edge and the right-angle side is used as the inclination angle, wherein the projection of the ink printed by the nozzle in the first direction is tangent.
2. The printing method as claimed in claim 1, wherein the controlling the nozzles to print the gratings on the surface of the curtain according to the tilt angle comprises the following steps:
acquiring a three-dimensional model of the grating;
slicing the three-dimensional model of the grating to obtain a plurality of sliced layers, and generating printing data corresponding to each sliced layer one by one;
and sequentially printing each cut layer by ink jet on the surface of the curtain according to the printing data corresponding to each cut layer one to one.
3. The printing method as claimed in claim 2, wherein the direction of movement of the nozzles relative to the screen is opposite during the inkjet printing of two adjacent cut layers.
4. A printing method as claimed in claim 3 wherein each cut layer is cured after it is inkjet printed in turn on the surface of the screen.
5. The printing method applied to the raster projection curtain as claimed in claim 1, wherein the printing method applied to the raster projection curtain comprises the steps of:
obtaining the width of the curtain, the printing precision of the grating in the first direction of the curtain and a three-dimensional model of the grating;
calculating the number of rows of the spray heads arranged along the first direction of the curtain according to the three-dimensional model of the grating;
calculating the movement width of the nozzle in the first direction of the curtain according to the width of the curtain;
acquiring an inclination angle of the orthographic projection of the nozzle row on the nozzle on the surface of the curtain compared with the first direction according to the printing precision;
and controlling the spray head to perform ink jet printing on the grating on the surface of the curtain according to the inclination angle.
6. The method as claimed in claim 5, wherein the step of calculating the number of rows of nozzles arranged along the first direction according to the three-dimensional model of the raster comprises the steps of:
calculating the total number N of the slicing layers according to the three-dimensional model of the grating, wherein N is an integer larger than 1;
the number of rows of nozzles arranged in the first direction is equal to the total number of slicing layers N.
7. A printing apparatus for printing a lenticular projection screen using the method of any one of claims 1 to 6, comprising a nozzle head having rows of nozzles projecting orthographically onto the screen surface at the oblique angle to the first direction of the screen.
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