CN114518617A - Method for manufacturing 3D (three-dimensional) micro-image-text based on micro-lens array - Google Patents

Method for manufacturing 3D (three-dimensional) micro-image-text based on micro-lens array Download PDF

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CN114518617A
CN114518617A CN202210186817.7A CN202210186817A CN114518617A CN 114518617 A CN114518617 A CN 114518617A CN 202210186817 A CN202210186817 A CN 202210186817A CN 114518617 A CN114518617 A CN 114518617A
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micro
array
printing
roller
text
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汤树海
陈琳轶
陈广学
李振华
朱琦
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Guangdong Zhuangli Color Printing Co ltd
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Guangdong Zhuangli Color Printing Co ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/0006—Arrays
    • G02B3/0012—Arrays characterised by the manufacturing method
    • G02B3/0031—Replication or moulding, e.g. hot embossing, UV-casting, injection moulding

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Abstract

A method for manufacturing 3D micro-image-text based on a micro-lens array comprises the following steps: (1) manufacturing a micro-lens array optical film, wherein a micro-lens array on the micro-lens array optical film is a micro-lens array arranged on the basis of regular hexagonal apertures and honeycombs; (2) designing a micro-image-text array according to the period of the micro-lens array and the requirement of moir é fringe pattern display effect, and manufacturing a printing plate according to the designed micro-image-text array; (3) and printing the micro image-text array on the micro lens array optical film by using a printing plate. The microlens array adopts a microlens array arranged based on regular hexagonal aperture and honeycomb, and the microlens array is applied to the 3D micrograph design and printing process based on the microlens array through analysis of moir é fringes of the microlens array arranged based on regular hexagonal aperture and honeycomb, so that the naked eye 3D display effect of the microlens array arranged based on regular hexagonal aperture and honeycomb is improved.

Description

Method for manufacturing 3D (three-dimensional) micro-image-text based on micro-lens array
Technical Field
The invention relates to the technical field of printing, in particular to a method for manufacturing a 3D (three-dimensional) micro image-text based on a micro lens array.
Background
The naked eye 3D printing technology based on the micro-lens array can realize the naked eye 3D display effect within the 360-degree full-angle range without any vision-aid equipment or observation techniques such as glasses, helmets and the like, can obviously improve the information display level, the interestingness and the anti-counterfeiting performance of a product, increases the visual impact force and the sensory experience of the product, greatly improves the added value of the product, and has very important engineering application value in the fields of packaging, printing, publishing, anti-counterfeiting, decoration, display and the like.
The naked eye 3D display effect based on the micro lens array is the result of the combined effect of the moire optical effect between the micro lens array and the micro graph and text array and the binocular parallax of human eyes. In 1994, the british scholars m.hutley et al first proposed the concept of moir magnifiers, which are a type of optically variable device in which a periodic microlens array and a microimage array are superimposed on each other, and preliminarily studied the basic properties of moir magnifiers. Superposition of the microlens array and the microimage-text array produces a moir optical effect, which is the result of integral imaging of the microimage-text by the plurality of microlenses. The microlens array has two important characteristics for moiire imaging of the microlens array: a moir é magnification feature and a moir é depth feature. Therefore, when the micro lens array and the micro image-text array are mutually superposed, under the resolution limit of human eyes, an observer can directly see a moir é fringe pattern with certain magnification and certain depth of field by naked eyes based on the binocular parallax principle.
The moir é fringe pattern display effect based on the microlens array is closely related to the period, spatial arrangement mode, superposition angle and the like of the microlens array and the micro graphic and text array. According to relevant literature research, the naked eye 3D printing technology based on the microlens array lacks a necessary moir é fringe analysis method, which is specifically represented as follows: focusing only on the periodic amplification feature of the moir é fringe pattern, the periodic formula of the moir fringe pattern is reduced to T = (T =)1T2)/｜T1-T2| of (wherein, T, T1、T2Moir é fringe pattern array period, microlens array period, and microimage array period, respectively), the spatial directional characteristic and the cell magnification characteristic of the moir fringe pattern are ignored. Therefore, when the micro-lens array is applied to 3D micro-image design and printing based on the micro-lens array, the naked eye 3D display effect is poor.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method for manufacturing a 3D micro image-text based on a micro lens array, wherein the micro lens array adopts a micro lens array based on regular hexagonal aperture and honeycomb arrangement, and the moirLee stripe of the micro lens array based on regular hexagonal aperture and honeycomb arrangement is analyzed and applied to the 3D micro image-text design and printing process based on the micro lens array, so that the naked eye 3D display effect of the micro lens array based on regular hexagonal aperture and honeycomb arrangement is improved. The technical scheme is as follows:
A method for manufacturing 3D micro-image-text based on a micro-lens array is characterized by comprising the following steps:
(1) manufacturing a micro-lens array optical film, wherein a micro-lens array on the micro-lens array optical film is a micro-lens array based on regular hexagonal aperture and honeycomb arrangement;
(2) designing a micro graphic and text array according to the period of the micro lens array and the requirement of the moir é fringe pattern display effect, and manufacturing a printing plate according to the designed micro graphic and text array;
(3) and printing the micro image-text array on the micro lens array optical film by using a printing plate.
Preferably, in the step (2), the requirements for the moire fringe pattern display effect include a period, a direction angle, a period magnification, and a cell magnification of the moire fringe pattern.
Preferably, the micro image-text array is a honeycomb-arranged circular unit micro image-text array.
In the step (1), the process of manufacturing the microlens array optical film includes the following four stages: (1-1) pre-treating an imprinting mold and a printing substrate; (1-2) a coating and sizing stage; (1-3) imprinting, curing and demolding stages; (1-4) post-treatment stage of the optical film.
The coating and sizing stage and the embossing, curing and demolding stage are main stages for manufacturing the microlens array optical film. The pre-treatment stage of the stamping die and the printing substrate and the post-treatment stage of the optical film belong to the auxiliary stage.
The pre-treatment stage of the stamping die and the printing substrate mainly comprises the following operations: cleaning the surface of the imprinting mold, adjusting the tension of the printing substrate, and removing dust and static electricity on the surface of the printing substrate.
The post-treatment stage of the optical film mainly comprises the following operations: and (4) performing static electricity removal, rolling and trimming on the micro-lens array optical film.
In the preferred step (1), the microlens array optical film is manufactured based on a nanoimprint process, which comprises the following steps: in the coating and gluing stage, coating UV photoresist on one surface of a substrate; in the stages of imprinting, curing and demolding, one surface of the substrate coated with the UV photoresist is tightly attached to the surface of the imprinting mold through extrusion, the UV photoresist flows into the microstructure grooves on the surface of the imprinting mold, and the residual photoresist is discharged out of the microstructure grooves; and then, curing the UV photoresist in the microstructure groove on the surface of the printing substrate by ultraviolet irradiation (the ultraviolet light source can adopt a UV-LED light source), separating the printing substrate from the imprinting mould, and attaching the formed microlens array on the surface of the printing substrate so as to form the microlens array optical film.
More preferably, in the step (1), the PET film is used as a substrate to be printed, and a micro-lens array optical film is prepared by a roll-to-roll UV-LED ultraviolet curing type nano-imprinting process through a micro-structure optical film forming machine; the microstructure optical film forming machine comprises a printing substrate conveying mechanism, a three-roller gluing mechanism, a UV-LED light source and an embossing mechanism, wherein the embossing mechanism is positioned behind the three-roller gluing mechanism along the conveying direction of the printing substrate, and the printing substrate conveying mechanism comprises an unreeling mechanism and a reeling mechanism;
The three-roller glue coating mechanism comprises a glue groove, a glue supply roller, a coating roller and a back pressure roller, wherein UV photoresist is stored in the glue groove, the glue supply roller is partially immersed in the UV photoresist in the glue groove, the coating roller is attached to the glue supply roller, and the back pressure roller is attached to the coating roller; the printing substrate sent out by the unreeling mechanism passes through the space between the back pressure roller and the coating roller, when coating the glue, the glue supplying roller rotates and takes out the UV photoresist from the glue groove, then the UV photoresist is transferred to the surface of the coating roller, the coating roller transfers the UV photoresist to one surface of the printing substrate close to the coating roller, and a layer of UV photoresist is formed on the printing substrate;
the embossing mechanism comprises an embossing roller, a front pressing roller and a rear pressing roller, the embossing mold is arranged on the outer circumferential surface of the embossing roller, the front pressing roller and the rear pressing roller are both in press fit with the embossing roller, and the rear pressing roller is positioned behind the front pressing roller along the conveying direction of the substrate to be printed; the UV-LED light source is arranged on the outer side of the embossing roller and is positioned between the front pressing roller and the rear pressing roller; when the printing substrate coated with the UV photoresist reaches the imprinting mechanism, the printing substrate passes through the space between the front press roller and the imprinting roller and then passes through the space between the rear press roller and the imprinting roller; when the printing substrate passes through the space between the front pressing roller and the imprinting roller, the surface of the printing substrate coated with the UV photoresist is tightly attached to the surface of the imprinting mold through the extrusion of the front pressing roller, the UV photoresist flows into the microstructure groove on the surface of the imprinting mold, and the residual photoresist is discharged out of the microstructure groove; then, the UV photoresist in the microstructure groove is solidified on the surface of the printing substrate through the irradiation of the ultraviolet light emitted by the UV-LED light source; the printing substrate passes through the space between the back press roller and the impression roller and then is separated from the impression mold (generally, after the printing substrate passes through the pressing part of the back press roller and the impression mold, a wrap angle is formed on the back press roller, and the printing substrate is separated from the outer circumferential surface of the impression roller under the guidance of the back press roller), the formed microlens array is attached to the surface of the printing substrate, and the formed microlens array optical film is rolled by a rolling mechanism.
The naked eye 3D display effect based on the micro lens array is the result of the combined effect of the moire optical effect between the micro lens array and the micro graph and text array and the binocular parallax of human eyes. Through calculation and deduction, mathematical relations among the period, the direction angle, the period magnification ratio and the unit magnification ratio of the moir é fringe pattern, the period of the micro-lens array, the period of the micro-image-text array and the superposition angle of the micro-lens array and the micro-image-text array are obtained.
After the microlens array optical film is manufactured, the spatial arrangement of the microlens array is determined, that is, the period of the microlens array is determined. On the basis of the known moirLeave pattern display effect, namely under the condition of knowing the period, the direction angle, the period magnification and the unit magnification of the moirLeave pattern, through moirLeave analysis of the micro lens array based on the regular hexagonal aperture and the honeycomb arrangement, the related design parameters of the micro graphic array (including the period of the micro graphic array, the area of the micro graphic array unit and the superposition angle between the micro lens array and the micro graphic array) can be obtained; and then designing a periodic micro-image text array file according to the period of the micro-lens array and the requirement of moir é fringe pattern display effect. The periodic micro-image-text array file can be designed through design software such as Adobe Illustrator and the like.
Preferably, in the step (2), the step of designing the periodic micro graphic array file is as follows:
(2-1) determining a minimal repeating unit;
(2-2) building a minimal repeating unit frame;
(2-3) setting the micro-graphic array element centered on the minimum repeating unit frame;
(2-4) copy translating the micro-text array element to the vertex of the minimum repeating unit frame;
(2-5) clipping the unnecessary part using a path finder, establishing a minimum repetition unit;
(2-6) dragging the minimal repeating unit into a color plate and renaming;
(2-7) establishing a filling area according to the design size;
and (2-8) selecting a region to be filled, and filling by using the minimum repeating unit made in the color plate to obtain the periodic micro image-text array file.
And after the design of the periodic micro-image-text array file is finished, manufacturing a printing plate according to the micro-image-text array file. The printing plate can be manufactured by a high-resolution CTP plate making machine.
Preferably, the printing plate is a PS plate (precoated photosensitive plate).
In the step (3), the printing method of the micro image-text array on the micro lens array optical film by using the printing plate may be: (1) back printing, namely printing surface pictures and texts and a micro picture and text array on the back of the micro lens array optical film; or (2) double-sided printing, namely printing a micro graphic and text array and surface graphic and text on the back surface and the front surface of the micro lens array optical film respectively. The front surface of the microlens array optical film means one surface on which a microlens array is formed, and the back surface is the other surface of the microlens array optical film.
In a specific scheme, the mode of printing the micro graphic and text array on the micro lens array optical film by using the printing plate in the step (3) is as follows: the method comprises the steps of firstly printing surface pictures and texts in four colors on the back surface of the micro-lens array optical film according to a printing color sequence K, M, C, Y, then printing a micro-picture and text array in four colors on the surface pictures and texts according to a printing color sequence K, M, C, Y, then printing a white ink layer on the micro-picture and text array, and then printing a gloss oil layer on the white ink layer. The gloss oil used for printing the gloss oil layer can adopt wear-resistant gloss oil.
In another specific scheme, the method for printing the micro image-text array on the micro lens array optical film by using the printing plate in the step (3) comprises the following steps: firstly, printing a micro-image-text array on the back surface of the micro-lens array optical film in four colors according to a printing color sequence K, M, C, Y, then printing a white ink layer on the micro-image-text array, and then printing a first gloss oil layer on the white ink layer; and sequentially printing surface images and texts on the front surface of the micro-lens array optical film according to the printing color sequence K, M, C, Y, and then printing a second gloss oil layer on the surface images and texts. The gloss oil used for printing the first gloss oil layer and the second gloss oil layer can adopt wear-resistant gloss oil.
The printing of the micro graphic and text array in the step (3) can adopt an offset printing process, such as: the PS plate is arranged on the printing plate cylinder, the dampening solution is coated on the blank area of the PS plate through the dampening solution cylinder, and the ink is coated on the image-text area of the PS plate through the ink cylinder; transferring the micro image-text array to a rubber blanket of a rubber blanket cylinder through transmission between a printing plate cylinder and the rubber blanket cylinder; and then the micro image-text array is transferred to the micro lens array optical film through the transmission between the rubber blanket cylinder and the compression roller (the micro lens array optical film passes through the rubber blanket cylinder and the compression roller, and the printing surface of the micro lens array optical film is tightly attached to the rubber blanket of the rubber blanket cylinder).
Compared with the prior art, the invention has the following beneficial effects: the microlens array adopts a microlens array arranged based on regular hexagonal aperture and honeycomb, and the microlens array is applied to the 3D micrograph design and printing process based on the microlens array through analysis of moir é fringes of the microlens array arranged based on regular hexagonal aperture and honeycomb, so that the naked eye 3D display effect of the microlens array arranged based on regular hexagonal aperture and honeycomb is improved.
The invention provides a moir é fringe analysis method of a micro-lens array based on regular hexagonal aperture and honeycomb arrangement, which deduces the mathematical relationship among the period, the direction angle, the period magnification, the unit magnification of a moir é fringe pattern, the period of the micro-lens array, the period of a micro-image-text array and the superposition angle of the two in detail, overcomes the defects that the prior method only focuses on the array magnification characteristic of the moir é fringe pattern and ignores the space direction characteristic and the unit magnification characteristic of the moir fringe pattern; the method is applied to the 3D micro-image-text design and printing process based on the micro-lens array, so that the naked eye 3D display effect based on the micro-lens array with regular hexagonal aperture and honeycomb arrangement is improved.
Drawings
In fig. 1, (a) represents the double-cluster line grating of the microlens array and the superposition relationship thereof, and (b) represents the double-cluster line grating of the microlens array and the superposition relationship thereof;
fig. 2 represents four clusters of line gratings of the micro lens array and the micro image-text array (wherein I, II represents two clusters of line gratings of the micro lens array, respectively, and iii and iv represent two clusters of line gratings of the micro image-text array, respectively);
fig. 3 is a schematic diagram of moire fringe patterns generated by mutually overlapping two groups of double-cluster line gratings, wherein: (a) the optical grating pattern comprises a moir fringe pattern formed by overlapping a line grating cluster I and a line grating cluster III, (b) a moir fringe pattern formed by overlapping a line grating cluster I and a line grating cluster IV, (c) a moir fringe pattern formed by overlapping a line grating cluster II and a line grating cluster III, and (d) a moir fringe pattern formed by overlapping a line grating cluster II and a line grating cluster IV;
FIG. 4 is a schematic diagram of a computation of moir é fringe pattern formed by overlapping a line grating cluster I and a line grating cluster III;
FIG. 5 is a schematic diagram of calculating moir é fringe patterns formed by overlapping a line grating cluster I and a line grating cluster IV;
FIG. 6 is a schematic diagram illustrating a calculation of moir é fringe pattern formed by overlapping the line grating clusters II and III;
FIG. 7 is a schematic diagram illustrating calculation of moir é fringe patterns formed by overlapping the line grating clusters II and the line grating clusters IV;
Fig. 8 is a schematic diagram of the spatial distribution of 4 groups of moire fringes, which are a moire fringe pattern 1, a moire fringe pattern 2, a moire fringe pattern 3 and a moire fringe pattern 4 from left to right;
FIG. 9 is a schematic diagram of calculation of a new pattern ABCD formed by intersection of the moire fringe pattern 1 and the moire fringe pattern 2;
FIG. 10 is a schematic diagram of the calculation of the new pattern ABCD formed by the intersection of the moire fringe pattern 1 and the moire fringe pattern 3;
FIG. 11 is a schematic diagram of the calculation of a new pattern ABCD formed by the intersection of the moire fringe pattern 1 and the moire fringe pattern 4;
FIG. 12 is a schematic diagram of the calculation of the new pattern ABCD formed by the intersection of the moire fringe pattern 2 and the moire fringe pattern 3;
FIG. 13 is a schematic diagram of the calculation of the new pattern ABCD formed by the intersection of the moire fringe pattern 2 and the moire fringe pattern 4;
FIG. 14 is a schematic diagram of the calculation of a new pattern ABCD formed by the intersection of the moire fringe pattern 3 and the moire fringe pattern 4;
FIG. 15 is a schematic view of a microlens array in an embodiment of the invention;
FIG. 16 is a schematic view of a micro-teletext array in an embodiment of the invention;
FIG. 17 is a schematic structural diagram of a micro-structured optical film forming machine used in an embodiment of the present invention;
fig. 18 is a schematic structural view of a micro-graphic array printing apparatus used in an embodiment of the present invention.
Detailed Description
The following description will be made in detail on the derivation of the moir é fringe analysis method based on regular hexagonal aperture and honeycomb arrangement microlens arrays, with reference to the accompanying drawings:
the microlens array a1 (see fig. 15) with the honeycomb arrangement and the regular hexagonal aperture and the microlens array a2 (see fig. 16) with the honeycomb arrangement and the circular unit can be theoretically regarded as a situation that a group of double-cluster line gratings are overlapped with each other, as shown in fig. 1, (a) in fig. 1 represents two clusters of line gratings (including a line grating cluster I and a line grating cluster II) of the microlens array a1, and (b) in fig. 1 represents two clusters of line gratings (including a line grating cluster iii and a line grating cluster iv) of the microlens array a 2. The moir é display effect of the honeycomb-arranged, regular-hexagonal-aperture microlens arrays on the corresponding microlens arrays can be simulated by dynamic superposition between two sets of double-cluster line gratings. The moir é display simulation analysis of two sets of double-cluster line gratings overlapped at different angles can be actually regarded as the mutual overlapping of four clusters of line gratings as shown in fig. 2, wherein a line grating cluster I and a line grating cluster II are respectively two clusters of line gratings forming a micro lens array, and a line grating cluster iii and a line grating cluster iv are respectively two clusters of line gratings forming a micro image-text array.
When the microlens array and the microlens array are overlapped with each other at a certain included angle (assuming that the spatial position of the microlens array is unchanged and the entire microlens array is rotated clockwise by an angle theta), the included angle between the line grating cluster I and the line grating cluster II is always unchanged (for example, always 60 °), and the included angle between the line grating cluster iii and the line grating cluster iv is also always unchanged (for example, always 60 °), that is, overlapping of the line grating clusters I and II and overlapping of the line grating clusters iii and iv do not always generate moir é fringe patterns. The linear grating cluster I is overlapped with the linear grating clusters III and IV to generate two groups of moire fringe patterns; two groups of moir é fringe patterns are generated by overlapping the linear grating clusters II with the linear grating clusters III and IV respectively, as shown in FIG. 3, (a) in FIG. 3 is a moir fringe pattern 1 formed by overlapping the linear grating clusters I and the linear grating clusters III, and (b) in FIG. 3 is a moir fringe pattern 2 formed by overlapping the linear grating clusters I and the linear grating clusters IV, and (c) in FIG. 3 is a moir fringe pattern 3 formed by overlapping the linear grating clusters II and the linear grating clusters III, and (d) in FIG. 3 is a moir fringe pattern 4 formed by overlapping the linear grating clusters II and the linear grating clusters IV.
(1) Period and azimuth angle of moir é fringe pattern
Let d be the period of the microlens array and the microimage-text array respectively1、d2The micro graphic and text array rotates clockwise theta, and theta is larger than or equal to 0 degree and smaller than or equal to 180 degrees. The period of the moir é fringe pattern 1 formed by overlapping the line grating clusters I and III is S1The direction angle is phi1(ii) a Moiire formed by overlapping line grating clusters I and IVThe period of the stripe pattern 2 is S2The direction angle is phi2(ii) a The period of the moir é fringe pattern 3 formed by overlapping the line grating clusters II and III is S3The direction angle is phi3(ii) a The period of the moir é fringe pattern 4 formed by overlapping the line grating clusters II and IV is S4The direction angle is phi4。
As shown in FIG. 4, for the moir é fringe pattern 1 formed by overlapping the line grating clusters I and III, the period of the line grating cluster I is d1Period of line grating cluster III is d2And the included angle between the two groups of line grating clusters is theta. As can be seen from fig. 4:
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(1)
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(2)
Figure 682899DEST_PATH_IMAGE003
(3)
from the formulae (1), (2) and (3), the period S of the moir é fringe pattern 1 can be obtained1Angle of orientation phi1Respectively as follows:
Figure DEST_PATH_IMAGE004
Figure 308309DEST_PATH_IMAGE005
as shown in FIG. 5, for the moir é fringe pattern 2 formed by overlapping the line grating clusters I and IV, the period of the line grating cluster I is d1The period of the line grating cluster IV is d2And the included angle between the two groups of line grating clusters is 60-theta. As can be seen from fig. 5:
Figure DEST_PATH_IMAGE006
Figure 31414DEST_PATH_IMAGE007
Figure DEST_PATH_IMAGE008
(8)
from the formulae (6), (7) and (8), the period of the moir é fringe pattern 2 is S 2The direction angle is phi2Respectively as follows:
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as shown in FIG. 6, for the moir é fringe pattern 3 formed by superimposing the line grating clusters II and III, the period of the line grating cluster II is d1Period of line grating cluster III is d2And the included angle between the two groups of line grating clusters is 60 degrees + theta. As can be seen from fig. 6:
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from the formulae (11), (12) and (13), the period of the moir é fringe pattern 3 is S3The direction angle is phi3Respectively as follows:
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Figure 524395DEST_PATH_IMAGE015
as shown in FIG. 7, for the moir é fringe pattern 4 formed by overlapping the line grating clusters II and IV, the period of the line grating cluster II is d1The period of the line grating cluster IV is d2And the included angle between the two groups of line grating clusters is theta. As can be seen from fig. 7:
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from the formulas (16), (17) and (18), the period of the moir é fringe pattern 4 is S4The direction angle is phi4Respectively as follows:
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through the deduction, calculation formulas of the period and the direction angle of the moir fringe pattern 1, the moir fringe pattern 2, the moir fringe pattern 3 and the moir fringe pattern 4 generated by mutually overlapping the line grating clusters I and III, the line grating clusters I and IV, the line grating clusters II and III and the line grating clusters II and IV are obtained. The moire fringe pattern 1, moire fringe pattern 2, moire fringe pattern 3, and moire fringe pattern 4 are shown in fig. 8.
For convenience of expression, we introduce vectors
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、
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、
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、
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Representing the moir é fringe pattern 1, the moir fringe pattern 2, the moir fringe pattern 3, and the moir fringe pattern 4, respectively, and having a period size S1、S2、S3、S4And an angle of direction phi1、φ2、φ3、φ4Satisfies the following conditions:
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(21)
φ1、φ2、φ3、φ4are respectively vector
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、
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、
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、
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An included angle between the positive axis and the negative axis of the x is less than or equal to phi 0 DEG1,φ2,φ3,φ4≤90°。
Suppose that
Figure DEST_PATH_IMAGE026
Representing the moir é fringe pattern ultimately produced by the superposition of the microlens array and the microimage-text array on each other, its period S and orientation angle phi can be expressed as:
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(22)
when the period size S is determined, the direction angle phi is S1、S2、S3、S4The direction angle corresponding to the medium maximum value.
(2) Periodic magnification and cell magnification of moire fringe pattern
(2-1) setting the periodic magnification of the moir é fringe pattern finally generated by mutually superposing the microlens array and the microimage-text array as MperiodThen MperiodCan be defined as the period S of moir é fringe pattern and the period d of the micro-pattern array2The ratio of the sizes, namely:
Figure DEST_PATH_IMAGE028
(2-2) the moire fringe pattern 1, the moire fringe pattern 2, the moire fringe pattern 3 and the moire fringe pattern 4 are crossed with each other to form 6 new patterns, and the area of the 6 new patterns is assumed to be A in sequence12、A13、A14、A23、A24、A34。
As shown in fig. 9, for a new pattern formed by the intersection of the moire fringe pattern 1 and the moire fringe pattern 2:
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(24)
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Figure 462560DEST_PATH_IMAGE031
from the formulas (24), (25) and (26), the area A of the new pattern formed by the intersection of the moir é fringe pattern 1 and the moir fringe pattern 2 12Comprises the following steps:
Figure DEST_PATH_IMAGE032
as shown in fig. 10, for a new pattern formed by the intersection of the moir é fringe pattern 1 and the moir fringe pattern 3:
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(28)
Figure DEST_PATH_IMAGE034
Figure 466605DEST_PATH_IMAGE035
from the formulae (28), (29) and (30), the moir é fringe pattern 1 intersects with the moir fringe pattern 3 to form a new pattern area A13Comprises the following steps:
Figure DEST_PATH_IMAGE036
as shown in fig. 11, for a new pattern formed by the moire fringe pattern 1 crossing the moire fringe pattern 4:
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(32)
Figure DEST_PATH_IMAGE038
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from the formulas (32), (33) and (34), the area A of the new pattern formed by the intersection of the moir é fringe pattern 1 and the moir fringe pattern 414Comprises the following steps:
Figure DEST_PATH_IMAGE040
as shown in fig. 12, for a new pattern formed by the moire fringe pattern 2 crossing the moire fringe pattern 3:
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Figure DEST_PATH_IMAGE042
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from the formulas (36), (37) and (38), the area A of the new pattern formed by the intersection of the moir é fringe pattern 2 and the moir fringe pattern 323Comprises the following steps:
Figure DEST_PATH_IMAGE044
as shown in fig. 13, for a new pattern formed by the moire fringe pattern 2 crossing the moire fringe pattern 4:
Figure 856217DEST_PATH_IMAGE045
Figure DEST_PATH_IMAGE046
Figure 683359DEST_PATH_IMAGE047
from the formulas (40), (41) and (42), the area A of the new pattern formed by the intersection of the moir é fringe pattern 2 and the moir fringe pattern 424Comprises the following steps:
Figure DEST_PATH_IMAGE048
as shown in fig. 14, for a new pattern formed by the intersection of the moire fringe pattern 3 and the moire fringe pattern 4:
Figure 736022DEST_PATH_IMAGE049
Figure DEST_PATH_IMAGE050
Figure 380630DEST_PATH_IMAGE051
from the formulas (44), (45) and (46), the area A of the new pattern formed by the intersection of the moir é fringe pattern 3 and the moir fringe pattern 4 34Comprises the following steps:
Figure DEST_PATH_IMAGE052
let the area of the micro-image-text array unit be AunitThe unit magnification of moir é fringe pattern finally generated by superposing the microlens array and the microimage-text array on each other is MunitThen MunitCan be defined as the maximum of the ratio of the area of the 6 new patterns to the area of the micro-graphic array element, i.e.:
Figure 712385DEST_PATH_IMAGE053
(3) applications of
Through the calculation and deduction, the period S, the direction angle phi and the period magnification M of the moir é fringe pattern are obtainedperiodCell magnification MunitAnd period d of the microlens array1Period d of the micro-graphic array2And the mathematical relationship between the superposition angle of the two.
When the micro-lensAfter the array optical film is manufactured, the spatial arrangement of the microlens array is determined, that is, the period d of the microlens array1Has already been determined. Based on the known moir é fringe pattern display effect, namely the known period S, the direction angle phi and the periodic magnification M of the moir fringe pattern finally generated by mutually overlapping the microlens array and the micro graph and text arrayperiodCell magnification MunitIn the case of (1), using the moir é fringe analysis result of the regular hexagonal aperture and honeycomb arrangement based microlens array, the design parameters (including the period d of the microlens array) related to the microlens array can be obtained by combining the expressions (4), (5), (9), (10), (14), (15), (19), (20), (22), (23), (27), (31), (35), (39), (43), (47) and (48) 2Area A of the micro-pattern array unitunitAnd the superposition angle theta between the microlens array and the micro graphic text array); and then designing a periodic micro graphic and text array file according to the design parameters.
Then, according to the designed micro-image-text array file, a printing plate is manufactured, and a corresponding micro-image-text array is printed on the micro-lens array optical film, so that the obtained 3D micro-image-text based on the micro-lens array has the required moiire fringe pattern display effect.
Manufacturing of 3D (three-dimensional) micro-image-text based on micro-lens array
In this embodiment, the method for manufacturing the 3D micro image based on the micro lens array includes the following steps:
(1) manufacturing a micro-lens array optical film, wherein a micro-lens array on the micro-lens array optical film is a micro-lens array A1 (refer to FIG. 15) based on a regular hexagonal aperture and honeycomb arrangement;
(2) designing a micro-image-text array according to the period of the micro-lens array and the requirement of moir é fringe pattern display effect, and manufacturing a printing plate according to the designed micro-image-text array;
in this step (2), the requirements of the moir é fringe pattern display effect include the period S, the azimuth angle Φ, and the period magnification M of the moir fringe pattern periodCell magnification Munit；
Referring to fig. 16, in the present embodiment, the micro-graphic array a2 is a micro-graphic array of honeycomb-arranged, circular cells; the design parameters include the period d of the micro-image-text array2Area A of the micro-pattern array unitunitAnd a superposition angle theta between the microlens array and the microimage-text array;
(3) and printing the micro image-text array on the micro lens array optical film by using a printing plate.
In the step (1), the process of manufacturing the microlens array optical film includes the following four stages: (1-1) pre-treating an imprinting mold and a printing substrate; (1-2) a coating and sizing stage; (1-3) imprinting, curing and demolding stages; (1-4) post-treatment stage of the optical film. The method specifically comprises the following steps:
(1-1) the pretreatment stages of the stamping die and the printing substrate mainly carry out the following operations: cleaning the surface of the imprinting mold, adjusting the tension of the printing substrate, and removing dust and static electricity on the surface of the printing substrate;
(1-2) coating a UV photoresist on one side of a printing substrate in a coating and sizing stage;
(1-3) in the stages of imprinting, curing and demolding, enabling one surface of a substrate to be printed, coated with UV photoresist, to be tightly attached to the surface of an imprinting mold through extrusion, enabling the UV photoresist to flow into a microstructure groove in the surface of the imprinting mold, and discharging the residual photoresist out of the microstructure groove; then, the UV photoresist in the microstructure groove is solidified on the surface of the printing substrate by ultraviolet irradiation (the ultraviolet light source can adopt a UV-LED light source), then the printing substrate is separated from the impression mould, and the formed microlens array is attached on the surface of the printing substrate, thereby forming the microlens array optical film;
(1-4) post-treatment stage of the optical film mainly comprising the following operations: and (4) performing static electricity removal, rolling and trimming on the micro-lens array optical film.
In this embodiment, a PET film is used as a substrate, and a micro-structure optical film forming machine is used to prepare a microlens array optical film by a roll-to-roll UV-LED ultraviolet curing nanoimprint lithography process.
Referring to fig. 17, the microstructure optical film forming machine includes a substrate conveying mechanism, a three-roller glue coating mechanism 01, a UV-LED light source 02 and an imprinting mechanism 03, wherein the imprinting mechanism 03 is located behind the three-roller glue coating mechanism 01 along the conveying direction of the substrate, and the substrate conveying mechanism includes an unwinding mechanism 04 and a winding mechanism 05;
the three-roller glue coating mechanism 01 comprises a glue tank 011, a glue supply roller 012, a coating roller 013 and a back pressure roller 014, wherein the glue tank 011 is stored with UV photoresist 015, the glue supply roller 012 is partially immersed in the UV photoresist 015 in the glue tank 011, the coating roller 013 is attached to the glue supply roller 012, and the back pressure roller 014 is attached to the coating roller 013; the printing substrate 06 sent out by the unreeling mechanism 04 passes through between the back pressure roller 014 and the coating roller 013, when coating the glue, the glue supply roller 012 rotates and takes out the UV photoresist from the glue groove 011, then the UV photoresist is transferred to the surface of the coating roller 013, the coating roller 013 transfers the UV photoresist to the surface of the printing substrate 06 close to the coating roller 013, and a layer of UV photoresist is formed on the printing substrate 06;
The embossing mechanism 03 comprises an embossing roller 031, a front press roller 032 and a rear press roller 033, the embossing mold is arranged on the outer circumferential surface of the embossing roller 031, the front press roller 032 and the rear press roller 033 are both pressed with the embossing roller 031, and the rear press roller 033 is positioned behind the front press roller 032 along the conveying direction of the printing substrate; the UV-LED light source 02 is arranged outside the embossing roller 031 and is positioned between the front pressing roller 032 and the rear pressing roller 033; when the printing substrate 06 coated with the UV photoresist reaches the embossing mechanism 03, the printing substrate 06 passes through between the front press roller 032 and the embossing roller 031, and then passes through between the rear press roller 033 and the embossing roller 031; when the substrate passes through the space between the front pressing roller 032 and the impression roller 031, the surface of the substrate coated with the UV photoresist is tightly attached to the surface of the impression mold by the extrusion of the front pressing roller 032, the UV photoresist flows into the microstructure groove on the surface of the impression mold, and the residual photoresist is discharged out of the microstructure groove; then, the UV photoresist in the microstructure groove is solidified on the surface of the printing substrate 06 through the irradiation of the ultraviolet light emitted by the UV-LED light source 2; the printing substrate 06 passes through between the back press roll 033 and the impression roll 031 and then breaks away from the impression mold (generally, after the printing substrate passes through the pressing part between the back press roll and the impression mold, a wrap angle is formed on the back press roll, and the printing substrate breaks away from the outer circumferential surface of the impression roll under the guidance of the back press roll), the formed microlens array is attached to the surface of the printing substrate 06, and the formed microlens array optical film 062 is rolled by the rolling mechanism 05.
After the microlens array optical film is manufactured in the step (1), the spatial arrangement of the microlens array is determined, that is, the period d of the microlens array is determined1Has already been determined.
In the step (2), the period d of the microlens array is determined according to1And combines the requirements of moir fringe pattern display effect (namely period S, direction angle phi and period magnification M of the moir fringe pattern)periodCell magnification Munit) The period S, the direction angle phi and the period magnification M of the derived moir é fringe pattern are calculated by the first partperiodCell magnification MunitAnd period d of the microlens array1Period d of the micro-graphic array2And the mathematical relationship between the two overlapping angles, such as the above-mentioned formulas (4), (5), (9), (10), (14), (15), (19), (20), (22), (23), (27), (31), (35), (39), (43), (47), (48), etc., to obtain the related design parameters of the micro-pattern array (including the period d of the micro-pattern array)2Area A of the micro-pattern array unitunitAnd the superposition angle theta between the microlens array and the microimage-text array); and then designing a periodic micro-image-text array file according to the design parameters.
In the step (2), the step of designing the periodic micro-image-text array file is as follows (the design can be performed by Adobe Illustrator and other design software):
(2-1) determining a minimal repeating unit;
(2-2) building a minimum repeating unit frame;
(2-3) setting the micro-teletext array element centered in the minimal repeating unit box;
(2-4) copy-translating the microform array element to the vertex of the minimum repeating unit frame;
(2-5) clipping the unnecessary part using a path finder, establishing a minimum repetition unit;
(2-6) dragging the minimal repeating unit into a color plate and renaming;
(2-7) establishing a filling area according to the design size;
and (2-8) selecting a region to be filled, and filling by using the minimum repeating unit made in the color plate to obtain the periodic micro image-text array file.
And after the design of the periodic micro-image-text array file is finished, manufacturing a printing plate according to the micro-image-text array file. The printing plate can be made by a high-resolution CTP plate making machine, and the printing plate is a PS plate (pre-coated photosensitive plate).
In the step (3), the printing method of the micro image-text array on the micro lens array optical film by using the printing plate may be: (1) back printing, printing the surface image and text and micro image and text array on the back of the micro lens array optical film 062; or (2) double-sided printing, i.e., printing a micro-image array and a surface image on the back and front sides of the micro-lens array optical film 062, respectively. The front surface of the microlens array optical film means one surface on which a microlens array is formed, and the back surface is the other surface of the microlens array optical film.
The method for printing the micro image-text array on the micro lens array optical film by using the printing plate in the step (3) can be as follows: the method comprises the steps of printing surface pictures and texts in four colors on the back surface of the microlens array optical film 062 according to a printing color sequence K, M, C, Y, printing a micro picture and text array in four colors on the surface pictures and texts according to a printing color sequence K, M, C, Y, printing a white ink layer on the micro picture and text array, and printing a gloss oil layer on the white ink layer. The gloss oil used for printing the gloss oil layer can adopt wear-resistant gloss oil.
The method for printing the micro image-text array on the micro lens array optical film by using the printing plate in the step (3) can also be as follows: firstly, printing a micro-image-text array on the back surface of the micro-lens array optical film 062 in four colors according to a printing color sequence K, M, C, Y, then printing a white ink layer on the micro-image-text array, and then printing a first gloss oil layer on the white ink layer; and sequentially printing surface images and texts on the front surface of the micro-lens array optical film according to the printing color sequence K, M, C, Y, and then printing a second gloss oil layer on the surface images and texts. The gloss oil used for printing the first gloss oil layer and the second gloss oil layer can adopt wear-resistant gloss oil.
The printing of the micro image-text array in the step (3) can adopt an offset printing process, referring to fig. 18, a PS plate is installed on a plate cylinder 07, fountain solution is coated on a blank area of the PS plate through a fountain solution cylinder 08, and ink is coated on an image-text area of the PS plate through an ink cylinder 09; transferring the micro-graphic array to a blanket of the blanket cylinder 010 by transmission between the plate cylinder 07 and the blanket cylinder 010; then, the micro image-text array is transferred to the micro lens array optical film 062 by the transmission between the blanket cylinder 010 and the press roller 0101 (the micro lens array optical film 062 passes through between the blanket cylinder 010 and the press roller 0101, and the print receiving surface of the micro lens array optical film 062 is tightly attached to the blanket of the blanket cylinder 010).
Third, verify
To verify the effectiveness of the theoretical analysis method of the present invention based on moiire display of a microlens array, two typical cases were chosen, in which the microlens array period D of the 3D printed article produced was1Micro graphic array period d2And the superposition angle theta between the two satisfies the following condition:
in case 1, the period of the micro-image-text array is slightly smaller than that of the micro-lens array, and d is set1＝70μm，d2The superposition angle theta is 0 degrees, 30 degrees, 60 degrees and 90 degrees respectively, which is 69 mu m;
in case 2, the period of the micro-image-text array is slightly longer than that of the micro-lens array, and d is set1＝70μm，d2The overlap angles θ are 0 °, 30 °, 60 °, and 90 °, respectively, 71 μm.
Assume in both cases that the radius r of the microphotograph element is 30 μm.
The moiire pattern period S, the azimuth angle φ, and the periodic magnification M are calculated for each of the above two cases based on the above equations (4), (5), (9), (10), (14), (15), (19), (20), (22), (23), (27), (31), (35), (39), (43), (47), and (48)periodAnd unit magnification MunitThe theoretical values of (A) are shown in Table 1.
TABLE 1
Serial number Periodic S/um Angle of orientation phi Periodic magnification Mperiod Unit magnification Munit
Case 1 (θ =0 °) 4830 0o 70 38109
Case 1 (θ =30 °) 134 77 o 2 274
Case 1 (θ =60 °) 4830 0 o 70 552
Case 1 (θ =90 °) 134 77 o 2 274
Case 2 (θ =0 °) 4970 0 o 70 40351
Case 2 (θ =30 °) 136 73 o 2 286
Case 2 (θ =60 °) 4970 0 o 70 576
Case 2 (θ =90 °) 136 73 o 2 286
Using a laser confocal electron microscope to respectively measure the moir é pattern period S, the direction angle phi and the period magnification ratio M under the two conditionsperiodAnd unit magnification MunitThe experimental values of (a) are shown in Table 2.
TABLE 2
Serial number Periodic S/um Angle of orientation phi Periodic magnification Mperiod Unit magnification Munit
Case 1 (θ =0 °) 4825 0o 70 —
Case 1 (θ =30 °) 133 76 o 2 276
Case 1 (θ =60 °) 4827 0 o 70 550
Case 1 (θ =90 °) 132 76 o 2 273
Case 2 (θ =0 °) 4974 0 o 70 —
Case 2 (θ =30 °) 135 74 o 2 284
Case 2 (θ =60 °) 4966 0 o 70 579
Case 2 (θ =90 °) 138 74 o 2 288
The rate of deviation of the experimental values from the theoretical values was then calculated for both cases, see table 3.
TABLE 3
Serial number Periodic S/um Angle of orientation phi Periodic magnification Mperiod Unit magnification Munit
Case 1 (θ =0 °) 0.10% 0 0 —
Case 1 (θ =30 °) 0.75% 1.30% 0 0.73%
Case 1 (θ =60 °) 0.06% 0 0 0.36%
Case 1 (θ =90 °) 1.50% 1.30% 0 0.36%
Case 2 (θ =0 °) 0.08% 0 0 —
Case 2 (θ =30 °) 0.74% 1.37% 0 0.70%
Case 2 (θ =60 °) 0.08% 0 0 0.52%
Case 2 (θ =90 °) 1.47% 1.37% 0 0.70%
As can be seen from Table 3, moir é pattern period S, azimuth angle φ, and period magnification ratio MperiodAnd unit magnification MunitAnd the like, and the deviation rate of the experimental value and the theoretical value is below 2 percent, so that the validity of the first part of moiire display theoretical analysis method based on the microlens array is verified.

Claims (10)

1. A method for manufacturing 3D micro-image-text based on a micro-lens array is characterized by comprising the following steps:
(1) manufacturing a micro-lens array optical film, wherein a micro-lens array on the micro-lens array optical film is a micro-lens array based on regular hexagonal aperture and honeycomb arrangement;
(2) designing a micro-image-text array according to the period of the micro-lens array and the requirement of moir é fringe pattern display effect, and manufacturing a printing plate according to the designed micro-image-text array;
(3) and printing the micro graphic and text array on the micro lens array optical film by using a printing plate.
2. The method for making a 3D microimage based on a microlens array as claimed in claim 1, wherein: in the step (2), the requirements of the moir é fringe pattern display effect include the period, the azimuth angle, the period magnification and the cell magnification of the moir fringe pattern.
3. The method for making 3D microimages based on microlens arrays according to claim 1 or 2, wherein: the micro image-text array is a honeycomb-arranged circular unit micro image-text array.
4. The method for making a 3D microimage based on a microlens array as claimed in claim 2, wherein:
the period d of the microlens array on the microlens array optical film manufactured according to the step (1) 1And the required period S, azimuth angle phi and periodic magnification M of the moir é fringe patternperiodCell magnification MunitCombining the following formulas (4), (5), (9), (10), (14), (15), (19), (20), (22), (23), (27), (31), (35), (39), (43), (47) and (48) to obtain the design parameters of the micro-pattern array, wherein the design parameters of the micro-pattern array comprise the period d of the micro-pattern array2Area A of the micro graphic and text array unitunitAnd the superposition angle theta between the micro lens array and the micro image-text array; then according to the obtained micro-image-text array period d2Area A of the micro graphic and text array unitunitAnd a superposition angle theta between the micro lens array and the micro image-text array, and designing a periodic micro image-text array file;
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(22)
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。
5. the method for making a 3D microimage based on a microlens array as claimed in claim 1, wherein: in the step (1), the process of manufacturing the microlens array optical film comprises the following four stages: (1-1) pre-treating an imprinting mold and a printing substrate; (1-2) a coating and sizing stage; (1-3) imprinting, curing and demolding stages; (1-4) post-treatment stage of the optical film;
in the coating and gluing stage, coating UV photoresist on one surface of a substrate;
In the stages of imprinting, curing and demolding, one surface of the substrate coated with the UV photoresist is tightly attached to the surface of the imprinting mold through extrusion, the UV photoresist flows into the microstructure grooves in the surface of the imprinting mold, and the residual photoresist is discharged out of the microstructure grooves; and then, curing the UV photoresist in the microstructure groove on the surface of the printing substrate by ultraviolet irradiation, separating the printing substrate from the imprinting mold, and attaching the formed microlens array on the surface of the printing substrate so as to form the microlens array optical film.
6. The method for making 3D micro-image based on micro-lens array as claimed in claim 5, wherein: in the step (1), a PET film is used as a printing substrate, and a micro-structure optical film forming machine is used for preparing a micro-lens array optical film by adopting a roll-to-roll UV-LED ultraviolet curing type nano-imprinting process; the microstructure optical film forming machine comprises a printing substrate conveying mechanism, a three-roller gluing mechanism, a UV-LED light source and an embossing mechanism, wherein the embossing mechanism is positioned behind the three-roller gluing mechanism along the conveying direction of the printing substrate, and the printing substrate conveying mechanism comprises an unreeling mechanism and a reeling mechanism;
the three-roller glue coating mechanism comprises a glue groove, a glue supply roller, a coating roller and a back pressure roller, wherein UV photoresist is stored in the glue groove, the glue supply roller is partially immersed in the UV photoresist in the glue groove, the coating roller is attached to the glue supply roller, and the back pressure roller is attached to the coating roller; the printing substrate sent out by the unreeling mechanism passes through the space between the back pressure roller and the coating roller, when coating the glue, the glue supplying roller rotates and takes out the UV photoresist from the glue groove, then the UV photoresist is transferred to the surface of the coating roller, the coating roller transfers the UV photoresist to one surface of the printing substrate close to the coating roller, and a layer of UV photoresist is formed on the printing substrate;
The stamping mechanism comprises a stamping roller, a front pressing roller and a rear pressing roller, the stamping die is arranged on the outer circumferential surface of the stamping roller, the front pressing roller and the rear pressing roller are both pressed with the stamping roller, and the rear pressing roller is positioned behind the front pressing roller along the conveying direction of the printing substrate; the UV-LED light source is arranged on the outer side of the embossing roller and is positioned between the front pressing roller and the rear pressing roller; when the printing substrate coated with the UV photoresist reaches the imprinting mechanism, the printing substrate passes through a space between the front pressing roller and the imprinting roller and then passes through a space between the rear pressing roller and the imprinting roller; when the printing substrate passes through the space between the front pressing roller and the imprinting roller, the surface of the printing substrate coated with the UV photoresist is tightly attached to the surface of the imprinting mold through the extrusion of the front pressing roller, the UV photoresist flows into the microstructure groove on the surface of the imprinting mold, and the residual photoresist is discharged out of the microstructure groove; then, the UV photoresist in the microstructure groove is solidified on the surface of the printing substrate through the irradiation of the ultraviolet light emitted by the UV-LED light source; the printing substrate passes through the space between the back press roller and the embossing roller and then is separated from the embossing mold, the formed micro-lens array is attached to the surface of the printing substrate, and the formed micro-lens array optical film is rolled by the rolling mechanism.
7. The method for making a 3D microimage based on a microlens array as claimed in claim 1, 2 or 4, wherein: in the step (2), the step of designing the periodic micro-image-text array file is as follows:
(2-1) determining a minimal repeating unit;
(2-2) building a minimal repeating unit frame;
(2-3) setting the micro-graphic array element centered on the minimum repeating unit frame;
(2-4) copy translating the micro-text array element to the vertex of the minimum repeating unit frame;
(2-5) clipping the redundant part using a path finder to establish a minimum repetition unit;
(2-6) dragging the minimal repeating unit into a color plate and renaming;
(2-7) establishing a filling area according to the design size;
and (2-8) selecting a region to be filled, and filling by using the minimum repeating unit made in the color plate to obtain the periodic micro image-text array file.
8. The method for making a 3D microimage based on a microlens array as claimed in claim 1, wherein: in the step (3), the mode of printing the micro-image-text array on the micro-lens array optical film by using the printing plate is as follows: (1) back printing, namely printing surface pictures and texts and a micro picture and text array on the back of the micro lens array optical film; or (2) double-sided printing, namely printing a micro graphic and text array and surface graphic and text on the back surface and the front surface of the micro lens array optical film respectively.
9. The method for making a 3D microimage based on a microlens array as claimed in claim 8, wherein: the method for printing the micro image-text array on the micro lens array optical film by using the printing plate in the step (3) comprises the following steps: the method comprises the steps of firstly printing surface pictures and texts in four colors on the back surface of the micro-lens array optical film according to a printing color sequence K, M, C, Y, then printing a micro-picture and text array in four colors on the surface pictures and texts according to a printing color sequence K, M, C, Y, then printing a white ink layer on the micro-picture and text array, and then printing a gloss oil layer on the white ink layer.
10. The method for manufacturing 3D micro-image based on micro-lens array as claimed in claim 8, wherein: the mode of printing the micro graphic and text array on the micro lens array optical film by using the printing plate in the step (3) is as follows: firstly, printing a micro-image-text array on the back surface of the micro-lens array optical film in four colors according to a printing color sequence K, M, C, Y, then printing a white ink layer on the micro-image-text array, and then printing a first gloss oil layer on the white ink layer; and sequentially printing surface images and texts on the front surface of the micro-lens array optical film according to the printing color sequence K, M, C, Y, and then printing a second gloss oil layer on the surface images and texts.
CN202210186817.7A 2022-02-28 2022-02-28 Method for manufacturing 3D (three-dimensional) micro-image-text based on micro-lens array Pending CN114518617A (en)

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