CN218956931U

CN218956931U - Micro-optical imaging system

Info

Publication number: CN218956931U
Application number: CN202320023796.7U
Authority: CN
Inventors: 庄孝磊; 林鹏飞; 刘歆; 李文扬; 黄晓泽
Original assignee: Shanghai Techsun Packing Materials Co ltd; Shanghai Tianchen Micro Nano Technology Co ltd
Current assignee: Shanghai Techsun Packing Materials Co ltd; Shanghai Tianchen Micro Nano Technology Co ltd
Priority date: 2023-01-05
Filing date: 2023-01-05
Publication date: 2023-05-02
Anticipated expiration: 2033-01-05

Abstract

The utility model discloses a micro-optical imaging system, and belongs to the technical field of optical imaging. The micro-optical imaging system includes: a substrate, a micropattern layer and a microlens array. The miniature image-text layer is arranged on one side of the base material and is provided with miniature image-text. The micro lens array is arranged on the other side opposite to the substrate and corresponds to the micro pattern. The micro-lens array comprises a plurality of micro-lens monomers, wherein each micro-lens monomer comprises an optical channel and a focusing structure, and the sum of the length of the optical channel and the thickness of the substrate layer is close to the focal length of the focusing structure.

Description

Micro-optical imaging system

Technical Field

The utility model relates to the technical field of optical imaging, in particular to a micro-optical imaging system.

Background

The micro-optical imaging system can be widely applied to commodity packaging, anti-counterfeiting labels and the like. The naked eye stereoscopic effect is presented through the micro-optical imaging system, so that the visual effect of commodity packaging is enriched, or the identification of the anti-counterfeiting label is improved.

In the related art, the micro-optical imaging system uses a substrate film as a support, and a micro-lens array and a micro-image-text array are formed on two opposite sides of the substrate film, so that the thickness of the substrate film needs to be consistent with the focal length of the micro-lens to achieve the expected effect, and is generally thicker. Among them, the base film is usually a polyester-based plastic film such as a polyethylene terephthalate (Polyethylene terephthalate, PET) film or a Polycarbonate (PC) film. However, the polyester-based substrate film of such thickness is strong in both toughness and stretch resistance. When the micro-optical imaging system is applied to the anti-counterfeit label, the anti-counterfeit label can be easily taken down from the commodity by an illegal molecule for secondary use. Moreover, today, where environmental protection is becoming more and more important, the global consensus of plastic removal has been reached, and micro-optical imaging systems with a substrate film as one of the main structures have difficulty adapting to the current requirements of plastic reduction and plastic reduction.

Disclosure of Invention

The technical problem to be solved by the utility model is to overcome the defect that a micro-optical imaging system in the prior art is difficult to adapt to the requirements of plastic removal and film removal.

The utility model solves the technical problems by the following technical scheme:

in a first aspect, a micro-optical imaging system is provided, the micro-optical imaging system comprising:

a substrate;

the miniature image-text layer is arranged on one side of the base material and provided with miniature image-text; and

the micro lens array is arranged on the other side opposite to the substrate and corresponds to the micro pattern;

the micro-lens array comprises a plurality of micro-lens monomers, wherein each micro-lens monomer comprises an optical channel and a focusing structure, the optical channels are connected with the base material, and the focusing structure is connected with one end, far away from the base material, of each optical channel.

In one embodiment, the difference between the sum of the length of the optical channel and the thickness of the substrate and the focal length of the focusing structure is less than or equal to a first set threshold.

In one embodiment, the length of the optical channel is equal to or greater than the thickness of the substrate.

In one embodiment, the cross-sectional width of the optical channel gradually decreases in a direction away from the microimage layer.

In one embodiment, the side wall of the optical channel forms a first angle with the longitudinal direction, and the first angle is smaller than or equal to a second set threshold.

In one embodiment, one optical channel is connected to at least one of the focusing structures.

In one embodiment, the radial cross-section of the focusing structure is circular or polygonal.

In one embodiment, the cross-sectional width of the junction of the focusing structure and the optical channel is 10-200 microns; and/or the height of the focusing structure is 5-100 micrometers.

In one embodiment, the micro image layer includes a plurality of micro images Wen Zhenlie formed by the micro images, and one optical channel is disposed corresponding to at least one micro image.

In one embodiment, a plurality of the miniature images and texts are distributed along a first direction and a second direction, and the first direction and the second direction are intersected;

the focusing structures are distributed along a third direction and a fourth direction, the third direction is parallel to the first direction, and the fourth direction is parallel to the second direction; or alternatively, the process may be performed,

the focusing structures are distributed along a third direction and a fourth direction, the third direction forms a second included angle with the first direction, and the fourth direction forms a third included angle with the second direction.

In one embodiment, the arrangement distance of adjacent miniature graphics and texts and the arrangement distance of adjacent focusing structures are based on a preset magnification and a preset depth of field configuration of the micro optical imaging system.

In one embodiment, the micro graphic layer includes at least two sub graphic layers stacked, and the micro graphic is disposed on the sub graphic layer.

The utility model has the positive progress effects that:

according to the micro-optical imaging system provided by the embodiment of the utility model, most of substrate films are replaced by the optical channels, so that the micro-optical imaging system can greatly reduce the use of polyester films, and the purpose of plastic reduction is achieved. In addition, the toughness of only a small part of the substrate films can be greatly reduced, the difficulty of the micro-optical imaging system in complete stripping under external force can be greatly improved, and when the micro-optical imaging system is applied to the scenes such as anti-counterfeiting marks, product trademarks and the like, the situation of being stolen by lawless persons is reduced, and the defect of improper use of the micro-optical imaging system in the related art is overcome.

Drawings

FIG. 1 is a schematic diagram of a micro-optical imaging system shown according to an exemplary embodiment;

fig. 2A and 2B are longitudinal cross-sectional views of microlens monomers shown according to various exemplary embodiments;

FIGS. 3A and 3B are schematic diagrams of microlens arrays shown according to various exemplary embodiments;

FIG. 4A is a side view of a microlens cell shown according to an exemplary embodiment;

FIG. 4B is a schematic view of a microlens array formed from the microlens monomers of FIG. 4A;

FIG. 4C is a schematic diagram of a microlens array shown according to another exemplary embodiment;

FIGS. 5A-5G are schematic diagrams of miniature graphics shown according to various exemplary embodiments;

FIG. 6 is a schematic diagram of a micro-optical imaging system according to another exemplary embodiment;

FIG. 7A is a diagram illustrating a distribution of miniature graphics according to an exemplary embodiment;

FIG. 7B is a diagram illustrating a distribution of focusing structures according to an example embodiment;

FIG. 7C is a diagram illustrating a distribution of miniature graphics according to another exemplary embodiment;

FIG. 7D is a diagram of a focus configuration shown according to another exemplary embodiment;

FIG. 8 is a diagram illustrating a profile of a miniature image and focus unit according to an exemplary embodiment;

fig. 9A and 9B are schematic diagrams of imaging effects of micro-optical imaging systems according to various exemplary embodiments;

FIGS. 10A and 10B are diagrams of imaging effects of micro-optical imaging systems according to further different exemplary embodiments;

FIGS. 11A and 11B are diagrams of imaging effects of micro-optical imaging systems according to further different exemplary embodiments;

FIGS. 12A and 12B are diagrams of imaging effects of micro-optical imaging systems according to further different exemplary embodiments;

FIG. 13 is a schematic diagram showing an imaging effect of a micro-optical imaging system according to another exemplary embodiment;

FIG. 14 is a flow chart of a micro-optical imaging system fabrication process shown according to an exemplary embodiment;

FIG. 15 is a partial flow chart illustrating a micro-optical imaging system fabrication process according to an exemplary embodiment;

FIGS. 16A-16E are different schematic diagrams illustrating the preparation of a template for a micro-optical imaging system according to an exemplary embodiment;

17A-17C are different schematic diagrams illustrating the preparation of a micro-optical imaging system according to an exemplary embodiment;

FIG. 18 is a schematic diagram illustrating an intermediate state of micro-optical imaging system fabrication according to an exemplary embodiment;

fig. 19 is a schematic diagram of a micro-optical imaging system template, according to an example embodiment.

In the above figures, the meaning of the individual reference numerals is as follows:

100. a carrier;

200. a miniature picture layer, 210, miniature pictures and texts, 220 and a sub miniature picture layer;

300. a microlens array 300a, a microlens monomer 310, an optical channel 320, and a focusing structure;

400. an image;

510. focusing structure templates 511, recessed areas 520, filling layers 521, portions to be removed 530, intermediate templates 540, imprint molds 550, micro-optical imaging system templates 551, recessed portions 551a, bottoms, 551b, connection portions 560, intermediate members;

600. a mask plate;

710. the glue applying device comprises a glue applying device 720, a first roller 730, a second roller 740 and an ultraviolet light source;

x, first direction, Y, second direction, X ', third direction, Y', fourth direction, alpha, first included angle, theta ₁ A second included angle theta ₂ And a third included angle.

Detailed Description

Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present disclosure as detailed in the accompanying claims.

The terminology used in the present disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. Unless defined otherwise, technical or scientific terms used in this disclosure should be given the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The terms "a" or "an" and the like as used in the description and the claims do not denote a limitation of quantity, but rather denote the presence of at least one. Unless otherwise indicated, the terms "comprises," "comprising," and the like are intended to cover the presence of elements or articles recited as being "comprising" or "including," and equivalents thereof, without excluding other elements or articles. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

As used in this disclosure and the claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any or all possible combinations of one or more of the associated listed items.

Example 1

Fig. 1 is a schematic diagram illustrating a structure of a micro-optical imaging system according to an exemplary embodiment. As shown in fig. 1, the micro-optical imaging system includes a substrate 100, a micro-graphic layer 200, and a microlens array 300. Wherein the micro graphic layer 200 is disposed on one side of the substrate 100 and the microlens array 300 is disposed on the opposite side of the substrate 100.

The micro graphic layer 200 is provided with a micro graphic 210, and the micro lens array 300 is arranged corresponding to the micro graphic 210. In this way, micro graphics can be displayed by the microlens array 300, and visual effects such as magnification, suspension, and the like are achieved.

The microlens array 300 includes a plurality of microlens cells 300a. The microlens cell 300a includes an optical channel 310 and a focusing structure 320. Wherein the optical channel 310 is connected to one side of the substrate 100, and the focusing structure 320 is connected to an end of the optical channel 310 remote from the substrate 100.

Wherein the sum of the length of the optical channel 310 and the thickness of the base layer 100 approximates the focal length of the focusing structure 320, and in particular, the difference between the sum of the length of the optical channel 310 and the thickness of the base layer 100 and the focal length of the focusing structure 320 is less than or equal to a first set threshold. The first set threshold is 10% of the focal length of the focusing structure 320, preferably the first set threshold is 5% of the focal length of the focusing structure 320. In this manner, by configuring the length of the optical channel 310 and the thickness of the substrate 100, the micro-image 210 is positioned as much as possible at the focal length of the focusing structure 320, so as to ensure that a clear image of the overall optical system is achieved.

On the basis of satisfying the above conditions, the length of the optical channel 310 and the thickness of the substrate 100 can be flexibly set, and preferably, the length of the optical channel 310 is equal to or greater than the thickness of the substrate layer 100, in this way, most of the substrate film in the related art is replaced by the structure of the optical channel 310, so that the tendency of plasticization is satisfied, and the defect that the substrate film is not easy to tear is avoided.

In embodiments of the present utility model, the optical channels in microlens array 300 have a variety of implementations. Fig. 2A and 2B are longitudinal cross-sectional views of microlens monomers shown according to various exemplary embodiments. The longitudinal direction refers to the extending direction of the micro lens monomer, and specifically refers to the direction of the micro lens monomer away from the micro graphic layer.

Alternatively, as shown in FIG. 2A, the optical channel 310 may be rectangular or oblong in longitudinal cross-section. In this case, the optical channel 310 is a cylinder or a polygonal column (e.g., a quadrangular prism, a hexagonal prism).

Alternatively, as shown in fig. 2B, the longitudinal section of the optical channel 310 is trapezoidal with a smaller top and a larger bottom. At this time, in conjunction with fig. 1, the radial cross section of the optical channel 310 gradually decreases in a direction away from the miniaturized graphic layer 200. And, the side wall 311 of the optical channel 310 forms a first included angle α with the length direction of the optical channel 310, where the first included angle α is less than or equal to the second set threshold. The second set threshold is 10 degrees, preferably 5 degrees, and in such a way, the die and the micro lens monomer are more easily separated in actual manufacturing and processing, so that the yield of the manufacturing process of the micro optical imaging system is improved.

In addition, referring to fig. 2A and 2B, at the junction of the focusing structure 320 and the optical channel 310, the cross-sectional shape of the focusing structure 320 matches the cross-sectional shape of the optical channel 310. Optionally, the focusing structure 320 is an integral structure with the optical channel 310. In this way, the focusing structure 320 is enabled to receive the light incident by the optical channel 310 to the greatest extent, and avoid presenting other graphic information outside the coverage area of the optical channel 310, so as to optimize the imaging quality of the whole optical system.

In the microlens array 300, the focusing structure 320 is one or a combination of refractive microlenses, reflective microlenses, and planar diffractive microlenses. Alternatively, the focusing structure 320 may have a cross-sectional width of 10-200 microns and a spherical cap height of 5-100 microns. The focal length of the focusing structure 320 is related to a structural parameter, for example, the focusing structure 320 is a refractive spherical microlens, and the calculation formula of the focal length is f=r/(n-1), where f is the focal length, r is the spherical radius of the refractive microlens, and n is the refractive index of the lens material.

In embodiments of the present utility model, the focusing structure 320 has a variety of implementations. Fig. 3A and 3B are schematic diagrams of microlens arrays shown according to various exemplary embodiments. Alternatively, as shown in fig. 3A, in the microlens array 300, the focusing structure 320 has a spherical structure. Alternatively, as shown in fig. 3B, in the microlens array 300, the focusing structure 320 has a base shape of a regular hexagonal structure. Under the condition of the same lens cross section width and the same arrangement distance of adjacent micro lens monomers, the micro lens monomers in the shape of the regular hexagon substrate can achieve the highest filling rate, and the higher the filling rate of the micro lens monomers, the clearer the graphic information presented by the micro lens array 300.

Further, optionally, the focusing structure 320 is a spherical structure, the focusing structure 320 being sized to: the cross-sectional width of the focusing structure 320 at the junction with the optical channel 310 is 10-200 microns. The height of the focusing structure 320 is 5-100 microns.

In an embodiment of the present utility model, one optical channel 310 is disposed corresponding to at least one focusing structure 320. In one example, fig. 4A is a side view of a microlens cell according to an exemplary embodiment, and fig. 4B is a schematic view of a microlens array formed from the microlens cell shown in fig. 4A. As shown in fig. 4A, one optical channel 310 connects two focusing structures 320. As shown in fig. 4B, the optical channels 310 and the focusing structures 320 are uniformly distributed. The arrangement distance of the adjacent optical channels 310 and the arrangement distance of the adjacent focusing structures 320 (including the arrangement distance of the focusing structures 320 on the same optical channel 310 and the arrangement distance of the adjacent focusing structures 320 on different optical channels 310) can be flexibly configured to achieve different display effects. In another example, fig. 4C is a schematic diagram of a microlens array shown according to another exemplary embodiment. As shown in fig. 4C, 3 focusing structures 320,3 focusing structures 320 are disposed on one optical channel 310, and a regular hexagonal structure is used. Of course, other numbers and shapes of focusing structures 320 may be disposed on the optical channels 310, and the arrangement of the focusing structures 320 on the same optical channel 310 is not specifically limited.

With respect to the structure of the micro graphic layer 200, with continued reference to fig. 1, the micro graphic layer 200 includes a plurality of micro graphics 210, and the plurality of micro graphics 210 are arranged into a micro graphic Wen Zhenlie. In embodiments of the present utility model, the micro-text 210 is a pattern or text on the order of microns, with a visual distinction from the portions surrounding the micro-text 210. Optionally, the miniature image 210 has one or more of transparent, chromatic, reflective, interference, dispersive, or polarization characteristics.

Fig. 5A to 5G are schematic diagrams of miniature graphics and texts according to different exemplary embodiments. As shown in fig. 5A, the micro graphic 210 has a concave structure, and as shown in fig. 5B, the micro graphic 210 has a convex structure.

Alternatively, as shown in fig. 5C, the thumbnail Wen Shanyuan 211 has a grid structure; as shown in fig. 5D, the miniature text 210 has a raised grid structure; as shown in fig. 5E, the miniature image 210 has a recessed grid structure. When the micro graphic 210 has a grid structure, it has an interference characteristic, achieving a different visual effect from the surrounding portion. The micro-graphic 210 is selected from one or more of a periodic grating structure, a random lattice structure, or a scattering structure, as desired. And various plating layers such as gold, aluminum, zinc sulfide and the like can be formed on all or partial areas of the surface of the grid structure, and the brightness and the contrast of the grid structure can be effectively improved through the plating layers.

Alternatively, as shown in fig. 5F, the miniature image 210 is a directly printed colored layer (e.g., color ink). Because of the small size of the miniature graphics context, direct printing of such fine graphics context structures requires special processes and equipment, which can be prepared by the miniature graphics context printing method disclosed with reference to CN 201110074244.0.

Alternatively, as shown in fig. 5G, the miniature image 210 has a recessed structure in which a coloring matter (e.g., color ink) is filled. Alternatively, the depth of the recessed features is between 1-5 microns, and the micro-graphic 210 is created by preferentially creating the recessed features and then filling the recesses with colorant.

Fig. 6 is a schematic structural view of a micro-optical imaging system according to another exemplary embodiment. As shown in fig. 6, the micro graphic layer 200 has a multi-layered structure. The micro graphic layer 200 includes at least two sub-graphic layers 220 stacked, and the micro graphic 210 is disposed on the sub-graphic layers 220. Optionally, the graphics content, color, style, arrangement and materials of the miniature graphics 210 on the different sub-graphics layers 220 are flexibly configured. For example, the miniature text 210 on the different sub-text layers 220 has overlapping places and has different colors. The micro lens array 300 performs enlarged imaging on the micro images 210 of the different sub-image layers 220, the micro images 210 on the different sub-image layers 220 are overlapped to form a plurality of groups of different comprehensive enlarged images, and the patterns of the different groups of micro images are skillfully designed to be matched with each other to reflect each other, so that the diversity and the attractiveness of the effect which can be achieved by the micro optical imaging system can be greatly increased.

There are various alternatives regarding the arrangement of the micro pattern Wen Zhenlie and the microlens array 300 in the micro pattern layer 200. Optionally, the arrangement of the micro icons 210 in the micro image Wen Zhenlie and the arrangement of the micro lens cells 300a in the micro lens array 300 are configured based on the desired magnification and the preset depth of field of the overall micro optical imaging system. Specifically, the arrangement distance of the adjacent miniature images and texts 210 and the arrangement distance of the adjacent focusing structures 320 are configured based on the preset magnification and the preset depth of field. The following describes the arrangement of the miniature image-text 210 and the focusing structure 320 in relation to the magnification and the depth of field in detail with reference to the accompanying drawings.

< first example >

In this example, the miniature image 210 and the focusing structure 320 are arranged in the same manner.

Fig. 7A is a diagram illustrating a distribution of a thumbnail image according to an exemplary embodiment, and fig. 7B is a diagram illustrating a focusing structure according to an exemplary embodiment. As shown in fig. 7A, a plurality of micro-text 210 (shown by the letter a as an example) is distributed along the first direction X and the second direction Y. The first direction X and the second direction Y intersect, for example, the first direction X and the second direction Y are orthogonal coordinate axes. As shown in fig. 7B, the focusing structure 320 has a circular cross section, and is distributed along a third direction X 'parallel to the first direction X and a fourth direction Y' parallel to the second direction Y.

Fig. 7C is a diagram illustrating a distribution of a thumbnail image according to another exemplary embodiment, and fig. 7D is a diagram illustrating a focusing structure according to another exemplary embodiment. As shown in fig. 7D, the focusing structures 320 have a regular hexagonal cross section, and at this time, adjacent focusing structures 320 are arranged in an edge-parallel manner. The miniature image 210 (shown by way of example as letter a) is arranged in the same manner as the focusing structure 320.

In the above example, the micro graphic 210 is arranged according to a first coordinate system formed by the first direction X and the second direction Y, the focusing structure 320 is arranged according to a second coordinate system formed by the third direction X 'and the fourth direction Y', and the second coordinate system forms an angle of 0 ° with the first coordinate system. In this manner, different magnification and stereoscopic depth effects can be achieved depending on the arrangement distance of the micro-text 210 and the arrangement distance of the focusing structure 320.

Specifically, referring to fig. 7A to 7D, the miniature graphics context 210 is arranged along the first direction X by a distance T _PX Defined as the distance between the centers of two adjacent miniature images 210 in the first direction X. Distance T of arrangement of the miniature graphics context 210 along the second direction Y _PY Defined as the distance between the centers of two adjacent miniature images 210 in the second direction Y. AggregationDistance T of arrangement of focal structure 320 along third direction X _LX Defined as the distance between the centers of the structures of two adjacent focusing structures 320 in the third direction X ', the focusing structures 320 are arranged along the fourth direction Y' by a distance T _LY Defined as the distance between the centers of two adjacent focusing structures 320 in the fourth direction Y'.

The magnification of the micro-optical imaging system is specifically as follows:

m is the method multiplying power of the micro-optical imaging system, T _L For the arrangement distance of the focusing structure 320, T _P Is the distance the miniature text 210 is arranged.

The three-dimensional depth of field is specifically:

D＝M*f

d is the depth of field of the micro-optical imaging system and f is the focal length of the micro-focus structure 320.

Combining the above, T _LX And T _PX Determines the magnification M of the miniature image-text 210 in the first direction X _X And depth of field D _X 。T _LY And T _PY Determines the magnification M of the miniature image-text 210 in the second direction Y _Y And depth of field D _Y . In addition, M _X 、M _Y The two can be the same or different, and different sizes can be flexibly and independently designed according to the needs. Likewise, D _X 、D _Y The two can be the same or different, and can be flexibly and independently designed into different sizes according to the needs.

< second example >

In this example, the thumbnail image Wen Zhenlie formed by the thumbnail image 210 is angled with respect to the microlens array in which the focusing structure 320 is located. Fig. 8 is a diagram illustrating a distribution of a miniature image and a focusing unit according to an exemplary embodiment. As shown in fig. 8, a second included angle θ is formed between the first direction X and the third direction X ₁ A third included angle theta is formed between the second direction Y and the fourth direction Y ₂ . Optionally, a second included angle theta ₁ And a third included angleθ ₂ And the same, namely, a deflection angle exists between the first coordinate system and the second coordinate system at the moment. In order to secure the imaging effect, generally θ ₁ And theta ₂ Less than or equal to 5 °.

T _PX 、T _PY 、T _LX T is as follows _LY The definition of (c) remains unchanged, in which case the magnification of the micro-optical imaging system is specifically:

m is the method multiplying power of the micro-optical imaging system, T _L For the arrangement distance of the focusing structure 320, T _P For the arrangement distance of the miniature graphics context 210, θ is a second included angle formed by the first direction and the third direction, or a third included angle formed by the second direction and the fourth direction.

The three-dimensional depth of field is specifically:

D＝M*f

Combining the above, T _LX 、T _PX And theta ₁ Determines the magnification M of the miniature image-text 210 in the first direction X _X And depth of field D _X 。T _LY 、T _PY And theta ₂ Determines the magnification M of the miniature image-text 210 in the second direction Y _Y And depth of field D _Y . Similarly, M _X 、M _Y The two can be the same or different, and different sizes can be flexibly and independently designed according to the needs. Likewise, D _X 、D _Y The two can be the same or different, and can be flexibly and independently designed into different sizes according to the needs. And, because there is the contained angle between first direction X and the third direction X ', there is the contained angle between second direction Y and the fourth direction Y', the image that whole micro-optical imaging system shows can take place the rotation, produces the effect of rocking.

In the embodiment of the utility model, by different T _L And T _P Can further enrich micro-scale by matchingImaging effect of the optical imaging system.

In one example, T _L And T _P Is constant. T (T) _L And T _P The constant value means that the arrangement distance of the focusing structure 320 and the arrangement distance of the micro graphic 210 are fixed values, that is, the focusing structure 320 and the micro graphic 210 are equidistantly arranged. At this time, the magnification M of the micro-optical imaging system is a fixed value, and the stereoscopic depth D is also a fixed value. Fig. 9A and 9B are diagrams illustrating imaging effects of a micro-optical imaging system according to various exemplary embodiments. If T _L <T _P Appears as a stereoscopic float and the micro-optical imaging system displays the same float height of the image 400 as shown in fig. 9A. If T _L >T _P Appears as a stereoscopic dip and the micro-optical imaging system displays the same dip of the image 400 as shown in fig. 9B.

In one example, T _L And T _P Is a variable. Specifically, in the micro graphic array 210, the arrangement distance of the micro graphic units 211 has various values, and correspondingly, in the micro lens array 300, the arrangement distance of the focusing structures 320 has various values. At this time, the focusing structure 320 and the micro-graphic 210 are arranged with a varying distance.

Alternatively, dynamic changes may also be embodied as T _L And T _P One constant and one variable, i.e., the focusing structure 320 and the micro-graphic 210 are equally spaced and one variable spaced.

Optionally, the arrangement distance of the micro icon 210 in the first direction and the second direction is changed in a preset manner. The arrangement distance of the focusing structure 320 in the third direction and the fourth direction is varied in a preset manner. Distance T of arrangement of focusing structure 320 in the third and fourth directions _LX And T _Ly Either constant or variable, or constant and variable. Distance T for arranging the miniature graphics context 210 in the first direction and the second direction _PX And T _Py Either constant or variable, or constant and variable.

According to the magnification and the stereoscopic depth of field formula, different regions of the micro optical imaging system can realize different magnifications and stereoscopic depth of field by configuring the arrangement distance of the micro image-text 210 and the focusing structure 320, thereby generating different visual effects. Fig. 10A and 10B are diagrams illustrating imaging effects of a micro-optical imaging system according to further different exemplary embodiments. As shown in fig. 10A, the arrangement distance of the miniature text 210 and the arrangement distance of the focusing structure 320 are configured to: the image 400 is spatially floating and the depth of field varies continuously linearly. As shown in fig. 10B, the arrangement distance of the miniature text 210 and the arrangement distance of the focusing structure 320 are configured to: the image 400 is shown in a stereoscopic floating state with depth of field varying to a spherical schematic.

In the embodiment of the utility model, the imaging effect of the micro optical imaging system can be further enriched by setting the size and shape of the micro image-text 210.

In one example, a unique macroscopic image may be implemented by setting the shape and size of the different miniature graphics 210. Fig. 11A and 11B are diagrams illustrating imaging effects of a micro-optical imaging system according to further different exemplary embodiments. By setting the shape and size of the miniature text 210 (as shown in fig. 11A), the display of a unique stereoscopic macroscopic image as shown in fig. 11B can be achieved.

In one example, fig. 12A and 12B are diagrams of imaging effects of micro-optical imaging systems shown according to further different exemplary embodiments. As shown in fig. 12A, when the area covered by the micro graphic 210 is larger than the area of the lateral cross section of the microlens cell 300a, crosslinking of the micro graphic 210 occurs. At this time, in order to avoid the cross-linking of the micro graphic, as shown in fig. 12B, only the portion of the micro graphic 210 corresponding to the cross-sectional area of the micro lens needs to be reserved. In this way, the image-text information presented by different micro-lens monomers is prevented from being interfered, and the imaging effect of the micro-optical imaging system is optimized.

In one example, fig. 13 is a schematic view showing an imaging effect of a micro-optical imaging system according to another exemplary embodiment, as shown in fig. 13, the graphic information in the micro-map Wen Zhenlie 210 is planar graphic information in which a spatial stereoscopic image is projected through each microlens cell 300a, in such a way that an image 400 presented by the micro-optical imaging system is a spatial stereoscopic image.

In summary, in the micro-optical imaging system provided by the embodiment of the utility model, the optical channel 310 is used to replace the substrate film, so that the micro-optical imaging system meets the requirements of plastic removal and film removal. In addition, the focusing structure 320 and the optical channel 310 of the microlens array 300 adopt an integrated structure, so that the structural stability of the whole micro-optical imaging system is improved, and the whole micro-optical imaging system is difficult to peel off under external force. When the method is applied to the scenes of anti-counterfeiting marks, product trademarks and the like, the situation that the anti-counterfeiting marks are stolen by lawbreakers is reduced, and the defect that a micro-optical imaging system is improperly used in the related technology is overcome.

Example 2

Based on the micro-optical imaging system provided in the above embodiment 1, embodiment 2 of the present utility model further provides a manufacturing method of the micro-optical imaging system. FIG. 14 is a flow chart of a micro-optical imaging system fabrication process, as shown in FIG. 14, according to an exemplary embodiment, the process comprising:

step S141, preparing a micro-optical imaging system template, wherein the micro-optical imaging system template comprises a concave part, and the concave part is matched with the structure of a micro-lens array in the micro-optical imaging system.

Fig. 15 is a partial flow chart illustrating a micro-optical imaging system fabrication process according to an exemplary embodiment. Fig. 16A-16E are different schematic diagrams illustrating the preparation of templates for a micro-optical imaging system according to an exemplary embodiment.

In one example, as shown in fig. 15, step S141 specifically includes:

and S151, manufacturing a focusing structure array template, wherein the focusing structure template comprises a concave region. As shown in connection with fig. 16A, the recessed areas 511 on the focusing structure template 510 form an array, and the structures of the recessed areas 511 match the focusing structures of the micro-lens cells of the micro-optical imaging system.

Specific processes adopted in step S151 include, but are not limited to: surface micromachining techniques, reactive ion beam etching techniques, photoresist hot-melt methods, laser direct writing techniques, hot-press molding methods, ion-exchange methods, gray-scale masking methods, inkjet methods (Int-jet), and photosensitive glass thermoforming methods. Taking the laser direct writing technique as an example, the focusing structure array template 510 of metal material (such as nickel) is manufactured by an electroforming process.

And step S152, determining the length of the optical channel, and forming a filling layer on the focusing structure array template according to the length.

The refractive index of the focusing structure is determined according to a predetermined material of the focusing structure in the micro-optical imaging structure, and then the focal length of the focusing structure is determined according to the refractive index and the spherical radius of the concave area. Specifically, the focal length of the focusing structure is obtained using the following formula:

f＝r/(n-1)

wherein f is a focal length, r is a spherical radius of the focusing structure, and n is a refractive index of the microlens monomer material.

According to the actual requirement, the thickness t of the substrate and the length d of the optical channel are determined, wherein the sum of the thickness t of the substrate and the length d of the optical channel is close to the focal length f of the focusing structure. Referring to fig. 16B, a fill layer 520 having a thickness d is formed on the focus-structure array template 510, for example, a photoresist layer (e.g., SU-8 negative photoresist) is coated on the focus-structure array template 510.

And step 153, removing a part of the filling layer corresponding to the concave region in the focusing structure template to obtain an intermediate template.

Optionally, a photoresist process is used to remove portions of the fill layer 520 corresponding to the recessed regions 511. Referring to fig. 16C, a mask 600 is used to cover a portion 521 of the filling layer 520 to be removed, and the filling layer 520 is exposed. Referring to fig. 16D, after the exposure treatment, development is performed using a developer. That is, the unexposed portions (i.e., portions 521 to be removed) of the filler layer 520 are etched away, resulting in an intermediate template 530. The intermediate template 530 now has the structure of a micro-optical imaging system template.

And step S154, obtaining an imprinting mold according to the intermediate template, and obtaining the micro-optical imaging system template through imprinting the template material of the imprinting mold.

Referring to fig. 16E, the intermediate mold plate 530 may be filled with a metallic nickel material to a certain thickness by a precision electroforming technique, and the imprint mold 540 may be obtained after demolding. The imprint mold 540 has the same structure as the micro-optical imaging system. The micro-optical imaging system template structure is obtained on the surface of the transparent material (for example, a polymer film such as PET, PP, PC) by an ultraviolet lithography process through the imprinting mold 540, so as to obtain the micro-optical imaging system template. The template material selected at the moment can be ultraviolet curing glue with the property of a master model, and the glue has high hardness and smooth surface after being exposed by strong ultraviolet light, has excellent demolding property and can be used as a template. The micro-optical imaging system template obtained by the process can be repeatedly used for a plurality of times.

Fig. 17A-17C are different schematic diagrams illustrating the preparation of a micro-optical imaging system according to an exemplary embodiment. Referring to fig. 14, step S142 is performed after step S141, specifically as follows:

step S142, coating a filling material on the micro-optical imaging system template, so that the filling material is completely filled in the micro-optical imaging system template structure, and compounding the substrate 100 with the filling material to obtain an intermediate member.

As shown in fig. 17A, a filling material (e.g., uv curable glue) is coated on the micro-optical imaging system template 550, and fills the recess 551 of the micro-optical imaging system template 550 while compounding the substrate 100 therewith to form an intermediate member 560. Optionally, the filler material applied to the micro-optical imaging system template 550 is an ultraviolet curing glue, which is cured to provide the intermediate member 560.

Fig. 18 is a schematic diagram illustrating an intermediate state of micro-optical imaging system fabrication according to an exemplary embodiment. As shown in fig. 18, the coating apparatus includes a sizing device 710, a first roller 720, a second roller 730, and an ultraviolet light source 740. The first roller 720 is used for driving the micro-optical imaging system template 550 to move, and the glue applying device 710 is disposed upstream of the first roller 720. The second roller 730 is disposed opposite to the first roller 720, and is used for pressing the micro-optical imaging system template 550 and the substrate 100. The ultraviolet light source 740 is disposed downstream of the second roller 730 and the first roller 720. In preparing the intermediate member, ultraviolet-curable glue is applied to the micro-optical imaging system template 550 by the glue applicator 710, and the ultraviolet-curable glue completely fills the recesses 551 by the nip of the first roller 720 (e.g., mirror roller) and the second roller 730 (e.g., nip roller). After the uv curing glue is applied, the micro-imaging system template 550 and the substrate 100 rotate with the first roller 720 and cure is achieved under continuous irradiation from the uv light source 740.

With continued reference to fig. 14, step S143 is performed after step S142, specifically as follows:

step S143, forming a micro pattern 210 on one side of the substrate layer of the intermediate member 560. The process for manufacturing the micro graphic 210 is not particularly limited, and may be, for example, a process of directly printing or filling ink into the embossed microstructure. And finally, stripping the substrate 100 from the micro-optical imaging system template to obtain the micro-optical imaging system.

In summary, the micro-optical imaging system obtained by the manufacturing method of the micro-optical imaging system provided by the embodiment of the utility model has an integrated structure. The substrate film in the related art is replaced by forming the optical channel, so that the micro-optical imaging system meets the requirements of deplasticization and deplating. And the integrated structure improves the stability of the micro-optical imaging system, and is difficult to be completely peeled off by external force. When the method is applied to the scenes of anti-counterfeiting marks, product trademarks and the like, the situation that the anti-counterfeiting marks are stolen by lawbreakers is reduced, and the defect that a micro-optical imaging system is improperly used in the related technology is overcome.

Example 3

Based on the micro-optical imaging system provided in the above embodiment 1, this embodiment provides a micro-optical imaging system template. Fig. 19 is a schematic diagram of a micro-optical imaging system template, according to an example embodiment. As shown in fig. 19, the micro-optical imaging system template 550 is formed with the concave portions 551, and the concave portions 551 are arranged in a concave portion array in a preset manner. The recess 551 matches the structure of a microlens array in a micro-optical imaging system. Alternatively, the recess 551 includes a bottom 551a and a connection 551b connected. The bottom 551a is used to form a focusing structure, and the connection 551b is used to form an optical channel connected to the focusing structure. The cross section of the bottom 551a may be selected from a circular shape, a rectangular shape, and a regular hexagon shape, and reference is made specifically to the form of the focusing structure. The length of the connection portion 551b is configured according to the length of the optical channel, and may be specifically described with reference to

embodiments

1 and 2, which are not described herein. In addition, the manufacturing method of the micro-optical imaging system template is described in detail in embodiment 2, and is not repeated here.

The micro-optical imaging system provided in the embodiment 1 can be manufactured through the micro-optical imaging system template to realize that the micro-optical imaging system meets the requirements of deplasticization and film removal, and meanwhile, the micro-optical imaging system manufactured by utilizing the template has an integrated structure, is good in structural stability and is difficult to be completely peeled off by external force. When the method is applied to the scenes of anti-counterfeiting marks, product trademarks and the like, the situation that the anti-counterfeiting marks are stolen by lawbreakers is reduced, and the defect that a micro-optical imaging system is improperly used in the related technology is overcome.

While specific embodiments of the utility model have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and the scope of the utility model is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the principles and spirit of the utility model, but such changes and modifications fall within the scope of the utility model.

Claims

1. A micro-optical imaging system, the micro-optical imaging system comprising:

a substrate;

the miniature image-text layer is connected with one side of the base material and is provided with miniature image-text; and

the micro lens array is connected with one side of the substrate far away from the micro image layer and is arranged corresponding to the micro image layer;

2. The micro-optical imaging system of claim 1, wherein a difference between a sum of a length of the optical channel and a thickness of the substrate and a focal length of the focusing structure is less than or equal to a first set threshold.

3. The micro-optical imaging system of claim 2, wherein the length of the optical channel is equal to or greater than the thickness of the substrate.

4. The micro optical imaging system as set forth in claim 1 wherein the cross-sectional width of the optical channel decreases gradually in a direction away from the micro graphic layer.

5. The micro-optical imaging system of claim 3, wherein the side wall of the optical channel forms a first angle with the longitudinal direction, the first angle being less than or equal to a second set threshold.

6. The micro-optical imaging system of claim 2, wherein one optical channel is connected to at least one of the focusing structures.

7. The micro-optical imaging system according to any one of claims 1-6, wherein the cross-sectional width of the focusing structure where it meets the optical channel is 10-200 microns; and/or

The height of the focusing structure is 5-100 micrometers.

8. The micro optical imaging system as set forth in claim 1 wherein the micro image layer comprises a plurality of micro images Wen Zhenlie formed from the micro images, one of the optical channels being disposed corresponding to at least one of the micro images.

9. The micro-optical imaging system of claim 8, wherein a plurality of the miniature images and texts are distributed along a first direction and a second direction, the first direction and the second direction intersecting;

10. The micro-optical imaging system of claim 8, wherein the arrangement distance of adjacent micro-graphics and the arrangement distance of adjacent focusing structures are based on a preset magnification and a preset depth of field configuration of the micro-optical imaging system.

11. The micro-optical imaging system of claim 1, wherein the micro-graphic layer comprises at least two sub-graphic layers arranged in a stack, the sub-graphic layers having the micro-graphic arranged thereon.