1. A reflective microlens array imaging apparatus, comprising:

a layer of microstructure array (11), a layer of transparent film (12), a layer of second microlens array (13) and a layer of reflective material body (14); the microstructure array (11) comprises a first microlens array 11 or a micro-pattern array;

the second micro lens array (13) is formed by arranging a plurality of sub lenses;

the first micro lens array 11 is formed by arranging a plurality of sub lenses in the same way as the sub lenses in the second micro lens array (13);

the micro-pattern array is formed by arranging a plurality of sub-patterns, and the arrangement mode of the sub-patterns is the same as that of the sub-lenses in the second micro-lens array (13).

2. The reflective microlens array imaging apparatus according to claim 1, wherein the arrangement of the plurality of sub-lenses in the second microlens array (13) includes any one of a hexagonal arrangement, a square arrangement, and a circular arrangement; when the arrangement mode of the plurality of sub-lenses of the first micro-lens array 11 adopts random arrangement, the coordinates of the second micro-lens array (13) and the microstructure array (11) have a mapping relation.

3. The reflective microlens array imaging apparatus of claim 2, wherein the plurality of lenslets have diameters between 20um and 150 um.

4. The reflective microlens array imaging apparatus of claim 1, wherein the period of the plurality of sub-patterns is between 50um and 200 um.

5. A reflective microlens array imaging device as in claim 1, wherein the transparent film (12) is between 10um-150um thick and its material comprises any of PE, PET, PC, PMMA.

6. A reflective microlens array imaging apparatus as claimed in claim 1, wherein the sub-lenses of the second microlens array (13) are parabolic surfaces and the rise of the sub-lenses is between 5um and 60 um.

7. The reflective microlens array imaging apparatus as set forth in claim 1, wherein the body of reflective material (14) includes any one of gold, silver, aluminum, and a reflective medium.

8. Reflective microlens array imaging apparatus as in any of claims 1 to 7, wherein the microstructure array (11) and the second microlens array (13) are superimposed at an angle in the range of 0.1-5 °.

9. The reflective microlens array imaging apparatus as in claim 1, wherein the microstructure array (11) is spaced from the second microlens array (13) by a distance equal to the focal length of the microlenses of the second microlens array (13) minus the sagittal height of the lenses; the thickness of the transparent film (12) is equal to the focal length of the microlenses of the second microlens array (13) minus the rise of the lenses.

10. A method of fabricating a reflective microlens array imaging apparatus according to any one of claims 1 to 9, comprising the steps of: the second micro-lens array (13) is prepared in a mould pressing mode; the reflecting material body (14) is prepared on the surface of the second micro lens array (13) through deposition and evaporation.

Background

When two layers with a certain period interfere with each other at a certain frequency, an amplified moire pattern can be obtained. The periodic patterns originally studied are often dot matrixes or line arrays, and the generated moire patterns are often very single in content and have certain application limitation. Subsequently, a dynamic display technology based on a microlens array and a micro graphic array has appeared, and the emergence of the technology has greatly promoted the development of the dynamic display technology and expanded the range of applications thereof. The microlens array imaging technology is viewed by naked eyes and has free angles, thereby being a novel public anti-counterfeiting technology which exceeds the traditional optically variable image. The anti-counterfeiting device based on the micro-lens array has horizontal parallax and vertical parallax at the same time, the observation angle is free, and an observer can see the stereoscopic image and text without any special observation equipment or skill; the technology is novel, the micro-image and text can not be obtained by the traditional copying method, and the anti-counterfeiting effect is good. The prior naked eye visual display technology is widely applied to the anti-counterfeiting field.

However, the prior art does not realize naked eye dynamic display of images, and has the problems of complex structure, short service life, high manufacturing cost and the like.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a reflective micro-lens array imaging device and a manufacturing method thereof, which realize naked eye dynamic display of images, can realize a lighter and thinner system structure, realize protection of micro-lenses, reduce abrasion, prolong the service life of the device and reduce the manufacturing cost.

The purpose of the invention is realized by the following scheme:

a reflective microlens array imaging apparatus, comprising:

a layer of microstructure array, a layer of transparent film, a layer of second microlens array and a layer of reflective material body; the microstructure array comprises a first micro-lens array or a micro-pattern array; the second micro lens array is formed by arranging a plurality of sub lenses; the first micro lens array is formed by arranging a plurality of sub lenses in the same way as the sub lenses in the second micro lens array; the micro-pattern array is formed by arranging a plurality of sub-patterns in the same way as the sub-lenses in the second micro-lens array 13.

Further, the arrangement of the plurality of sub-lenses in the second microlens array includes any one of a hexagonal arrangement, a square arrangement, and a circular arrangement; when the arrangement mode of the plurality of sub lenses of the first micro lens array adopts random arrangement, the coordinates of the second micro lens array and the micro structure array have a mapping relation.

Further, the plurality of lenslets have a diameter between 20um and 150 um.

Further, the period of the plurality of sub-patterns is between 50um and 200 um.

Further, the thickness of the transparent film is between 10um-150um, and the material thereof includes any one of PE, PET, PC, PMMA.

Further, the sub-lenses of the second microlens array are paraboloids, and the saggites of the sub-lenses are between 5um and 60 um.

Further, the body of reflective material includes any one of gold, silver, aluminum, and a reflective medium.

Further, the microstructure array and the second microlens array are superimposed at an angle in the range of 0.1-5 °.

Further, the distance between the microstructure array and the second microlens array is equal to the focal length of the microlenses of the second microlens array minus the rise of the lenses; the thickness of the transparent film is equal to the focal length of the microlenses of the second microlens array minus the rise of the lenses.

A method of fabricating any of the reflective microlens array imaging devices, comprising the steps of: the second micro-lens array is prepared in a mould pressing mode; the reflecting material body is prepared on the surface of the second micro-lens array through deposition and evaporation.

The invention has the beneficial effects that:

the invention realizes naked eye dynamic display of images, and can realize a thinner system structure due to smaller film thickness required by a reflective micro-lens imaging system; the reflective material on the surface of the lens realizes the protection of the micro lens, has less abrasion, prolongs the service life of the device and reduces the manufacturing cost.

Drawings

The drawings in the following description are only some embodiments of the invention, and other drawings can be derived by those skilled in the art without inventive exercise.

FIG. 1 is a schematic diagram of a reflective microlens array imaging apparatus according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of an exemplary embodiment of a reflective microlens array imaging apparatus;

FIG. 3 is a schematic diagram of a rectangular arrangement of a microlens array according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a random arrangement of a microlens array according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of light transmission paths corresponding to different viewing angles according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of an actual light path of a light beam emitted by a pixel at a focal point of a microlens according to an embodiment of the present invention after the light beam is reflected by the microlens;

FIG. 7 is a schematic diagram of an actual optical path of light emitted by a pixel located above a focal point of a microlens according to an embodiment of the present invention after the light is reflected by the microlens;

in the figure, a first microlens array 11, a transparent film 12, a second microlens array 13, a reflective material body 14, a first pixel 51, a second pixel 52, a micro-pattern array 21, a second transparent film 22, a third micro-pattern array 23, and a second reflective material body 24.

Detailed Description

All of the features disclosed in all of the embodiments in this specification, or all of the steps in all of the methods or processes implicitly disclosed, may be combined or substituted in any way, except where mutually exclusive features and/or steps are present.

As shown in fig. 1 to 5, a reflective microlens array imaging device includes:

a layer of microstructure array, a layer of transparent film 12, a layer of second microlens array 13 and a layer of reflective material 14; the microstructure array comprises a first microlens array 11 or a micro-pattern array; the thickness of the transparent film 12 is equal to the curvature radius of the micro-lenses of the second micro-lens array 13; the second microlens array 13 is formed by arranging a plurality of sub-lenses; the first microlens array 11 is formed by arranging a plurality of sub lenses in the same way as the sub lenses in the second microlens array 13; the micro-pattern array is formed by arranging a plurality of sub-patterns in the same way as the sub-lenses in the second micro-lens array 13.

Further, the arrangement of the plurality of sub-lenses in the second microlens array 13 includes any one of a hexagonal arrangement, a square arrangement, and a circular arrangement; when the arrangement of the plurality of sub-lenses of the first microlens array 11 adopts random arrangement, the coordinates of the second microlens array 13 and the microstructure array have a mapping relationship.

Further, the plurality of lenslets have a diameter between 20um and 150 um.

Further, the period of the plurality of sub-patterns is between 50um and 200 um.

Further, the thickness of the transparent film 12 is between 10um-150um, and the material thereof includes any one of PE, PET, PC, PMMA.

Further, the sub-lenses of the second microlens array 13 are paraboloids, and the sagittal height of the sub-lenses is between 5um and 60 um.

Further, the body of reflective material 14 includes any of gold, silver, aluminum, and a reflective medium.

Further, the microstructure array is superimposed with the second microlens array 13 at an angle in the range of 0.1-5 °.

Further, the distance between the microstructure array 11 and the second microlens array 13 is equal to the focal length of the microlenses of the second microlens array 13 minus the rise of the lens; the thickness of the transparent film 12 is equal to the focal length of the microlenses of the second microlens array 13 minus the rise of the lenses.

A method of fabricating any of the reflective microlens array imaging devices, comprising the steps of: the second microlens array 13 is prepared by adopting a mould pressing mode; the reflective material 14 is prepared on the surface of the second microlens array 13 by deposition and evaporation.

As shown in fig. 1, as an embodiment, a schematic structural diagram of a reflective microlens array imaging apparatus includes, from top to bottom, a four-layer structure: the micro-structure array, the transparent film 12, the second micro-lens array 13 and the reflecting material body 14. Wherein, the period of the microstructure array is 50um, the aperture is 40um, and the thickness of the transparent film 12 is 100 um. Wherein the microstructure array comprises a first microlens array 11 or a micro-pattern array 21, as shown in fig. 2.

The period of the microlens array can be 55um, the aperture is 50um, the first microlens array 11 and the second microlens array 13 are both distributed in a rectangular shape, and the superposition angle of the two is 3 degrees. The material of the reflective material body 14 may be one of gold, silver, and aluminum, or may be other medium having a reflective function. In this embodiment, a layer of aluminum material with a thickness of 50um is prepared on the surface of the second microlens array 13 by evaporation.

One way of arranging the reflective layer is shown in fig. 1, but it is also possible to arrange the reflective layer as shown in fig. 2. In fig. 2, reference numeral 24 denotes a second reflective material body, and in this case, the thickness of the second reflective material body 24 may be set thinner, between 50-200nm, reference numeral 22 denotes a second transparent film, and reference numeral 23 denotes a third microlens array.

The first microlens array 11 in this embodiment may be replaced with the micro pattern array 21 to obtain a desired pattern.

The first microlens array 11 and the second microlens array 13 in this embodiment are arranged as shown in fig. 3, and if necessary, they may be arranged in a random manner as shown in fig. 4.

After passing through the transparent film of the second layer, the light emitted from the microstructure array of the first layer will react with the microlens array of the third layer to be reflected, and the light transmission route is shown in fig. 5. The micro-image array is located the focal plane of micro-lens array sub-lens, and the light that first pixel 51 on the micro-image array sent gets into people's eye through parallel outgoing after the reflection, and people's eye observes first pixel 51's virtual image, and in a similar way, the light that second pixel 52 sent gets into people's eye after the reflection, and people's eye observes second pixel 52's virtual image. Each microlens corresponds to different pixel points, and a complete dynamic image is formed by the collection of the pixel points. Fig. 6 and 7 show the actual light path of the light emitted from the pixel at different positions on the micro-pattern after being reflected by the micro-lens.

The transparent film 12 in this embodiment may be made of PC (polycarbonate), PET (polyethylene terephthalate), PVC (polyvinyl chloride), etc., and the specific material is determined according to the use requirement. The thickness of the transparent film 12 may be 100 μm in the present embodiment.

The particular embodiments described above are illustrative and not restrictive. All such modifications are intended to be included within the scope of this invention as defined in the following claims and their equivalents.

Other embodiments than the above examples may be devised by those skilled in the art based on the foregoing disclosure, or by adapting and using knowledge or techniques of the relevant art, and features of various embodiments may be interchanged or substituted and such modifications and variations that may be made by those skilled in the art without departing from the spirit and scope of the present invention are intended to be within the scope of the following claims.