Optical imaging film

Abstract

The utility model discloses an optical imaging film, which comprises an optical spacing layer, the optical spacing layer comprises a bearing body and a first auxiliary layer, the bearing body comprises a first surface and a second surface arranged oppositely, and the first auxiliary layer is located on one surface of the bearing body; the focusing layer is located on one side of the first surface of the bearing body, and the focusing layer comprises a plurality of focusing units; the image-text layer is located on one side of the second surface of the bearing body, and the image-text layer comprises a plurality of micro image-text units; wherein the first auxiliary layer can prevent light rays with the light wavelength of 380 nm or below from penetrating through the first auxiliary layer. According to the invention, the supporting body is arranged to prevent the light with the wavelength of less than 380nm from passing through, so that exposure can be carried out at the two sides of the optical spacer at the same time, the light at one side does not affect the optical layer at the other side, only the mask plates at the two sides of the optical spacer layer need to be aligned, and the alignment error in the production process is extremely small.

Description

Technical Field

[0001] The present application relates to the technical field of imaging films, and in particular to an optical imaging film. Background Art

[0002] In recent years, micro-optical elements based on the moiré magnification principle can magnify micron-level images hundreds of times to form recognizable images at the millimeter level. At the same time, the presented images can have dynamic effects as the viewing angle changes, and have attracted attention in various fields, especially in the fields of decoration and anti-counterfeiting.

[0003] However, in the field of optical material preparation technology, especially in the preparation process of imaging films, PET (polyethylene terephthalate) substrate is usually required as the base material. However, the PET substrate is coated with UV glue, and then embossed by embossing to form a focusing unit and a graphic structure respectively. This method requires a very high alignment progress during the preparation process, but whether both sides are embossed at the same time or separately, it is difficult to meet the fine imaging requirements due to the alignment error of the embossing itself; another preparation method in the prior art uses exposure and development to prepare the focusing structure and the graphic structure, and can only expose the two structures separately, because the substrate and the material layer are both passed, and the glue needs to be coated on the substrate separately and exposed separately. Although the accuracy can meet the fine imaging requirements, the production efficiency is low, which is not conducive to large-scale production.

[0004] In summary, the existing preparation methods cannot meet the requirements of large-scale, high-precision alignment for preparing imaging films, so there is an urgent need to provide a new structure and a new preparation method to solve the technical problems of the existing technology. Utility Model Content

[0005] Based on this, it is necessary to provide an optical imaging film to solve the above technical problems.

[0006] A technical solution of this application is:

[0007] An optical imaging film, characterized in that it comprises:

[0008] An optical spacing layer, the optical spacing layer comprising a carrier and a first auxiliary layer, the carrier comprising a first surface and an oppositely disposed second surface, the first auxiliary layer being located on one surface of the carrier;

[0009] A focusing layer, the focusing layer is located on one side of the first surface of the carrier, and the focusing layer includes a plurality of focusing units;

[0010] A graphic layer, the graphic layer is located on one side of the second surface of the carrier, and the graphic layer includes a plurality of micro graphic units;

[0011] Wherein, the first auxiliary layer can prevent light with a wavelength below 380nm from passing through; the focusing unit is matched with the micro-image unit to form an enlarged image.

[0012] In one embodiment, an optical layer is provided on the second surface of the carrier, grooves are formed on the surface of the optical layer, and the grooves constitute micro-image units, thereby forming the image layer.

[0013] In one embodiment, the groove is filled with a colored material and / or a material having a refractive index difference with the graphic layer to form a micro graphic unit.

[0014] In one embodiment, the focusing unit is a micro lens or a cylindrical mirror.

[0015] In one embodiment, a second auxiliary layer is further included, and the second auxiliary layer is located on one surface of the carrier, wherein the first auxiliary layer and the second auxiliary layer are respectively located on both sides of the carrier, and the second auxiliary layer can prevent light with a wavelength below 380nm from passing through.

[0016] In one embodiment, the focusing unit and the micro-image unit are formed by exposure and development.

[0017] In one embodiment, the carrier is one of PET, PC, PMMA, glass, and PE.

[0018] In one embodiment, the first auxiliary layer can prevent light with a wavelength of 380nm-345nm from passing through; or, can prevent light with a wavelength of 370nm-355nm from passing through.

[0019] In one embodiment, the second auxiliary layer can prevent light with a wavelength of 380nm-345nm from passing through; or, can prevent light with a wavelength of 370nm-355nm from passing through.

[0020] In one embodiment, the focusing units are periodically arranged on one side of the first surface of the carrier, or randomly arranged on one side of the first surface of the carrier.

[0021] The beneficial effects of the present application are as follows: the present application sets the carrier to prevent light with a wavelength below 380nm from passing through, so that exposure can be performed on both sides of the optical spacer at the same time, and the light on one side will not affect the optical layer on the other side, so that only the mask plates of the two layers of the optical spacer layer need to be aligned, so that the alignment error during the production process is extremely small, and the alignment error will not increase with the production time, and this preparation method can also be applied to the roll-to-roll production process, which greatly improves the production efficiency while ensuring the imaging effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of an optical imaging film structure of the present application;

[0023] Figure 2 This is another schematic diagram of the structure of an optical imaging film of the present application;

[0024] Figure 3 This is another schematic diagram of the structure of an optical imaging film of the present application;

[0025] Figure 4 This is a schematic diagram of the imaging effect of an optical imaging film in this application;

[0026] Figure 5 This is a structural schematic diagram of an intermediate process of a method for preparing an optical imaging film according to the present application;

[0027] Figure 6 This is a structural schematic diagram of an intermediate process of a method for preparing an optical imaging film according to the present application;

[0028] Figure 7 This is a structural schematic diagram of an intermediate process of a method for preparing an optical imaging film according to the present application;

[0029] Figure 8 This is a schematic diagram of a roll-to-roll production method in a method for preparing an optical imaging film in the present application. DETAILED DESCRIPTION

[0030] In order to facilitate the understanding of the present application, the present application will be described more comprehensively below with reference to the relevant drawings. The preferred embodiments of the present application are given in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described below. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thoroughly and comprehensively understood.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0032] like Figure 1 As shown, an optical imaging film can be used in the fields of anti-counterfeiting, decoration, etc. The optical imaging film includes:

[0033] An optical spacing layer, the optical spacing layer comprises a carrier 10 and a first auxiliary layer 40, the carrier 10 comprises a first surface and a second surface arranged oppositely, the first auxiliary layer 40 is located on one of the surfaces of the carrier; the carrier 10 can be one of PET, PC, PMMA, glass, and PE. It can be seen from the material of the carrier 10 that the carrier 10 is light-transmissive, and there is no special limitation on being able to prevent the transmission of light. Under normal circumstances, visible light or light in other wavelengths can pass through the carrier 10. The first auxiliary layer can prevent light with a wavelength below 380nm from passing through;

[0034] A focusing layer, the focusing layer is located on one side of the first surface of the carrier 10, the focusing layer includes a plurality of focusing units 22, the focusing units 22 are micro lenses or cylindrical mirrors; an image layer, the image layer is located on one side of the second surface of the carrier 10, the image layer includes a plurality of micro image units 31; Figure 1 It can be seen from the figure that the first auxiliary layer 40 is located on the first surface of the carrier 10, that is, between the carrier 10 and the focusing layer; the focusing unit and the micro-image unit are formed by exposure and development.

[0035] Among them, Figure 4 As shown, the focusing unit 22 is matched with the micro-image unit 31 to form an enlarged image. The image layer is composed of a plurality of micro-image units 31, and the micro-image unit 31 is the letter "A". The micro-image unit 31 passes through the focusing unit 22 in the focusing layer to form a suspended image "A" 31', and the suspended image "A" 31' is at a certain distance from the imaging film; the focusing unit 22 can be arranged periodically on one side of the optical spacing layer, and can also be randomly arranged on one side of the optical spacing layer. The micro-image unit 31 is adapted to the focusing unit 22.

[0036] Figure 1 In the embodiment, the first auxiliary layer 40 is located on the first surface of the carrier 10. Of course, the first auxiliary layer 40 can also be disposed on the second surface of the carrier 10. When there is only one auxiliary layer, it can be disposed on any surface of the carrier 10. Figure 2As shown, it also includes a second auxiliary layer 41, which is located on the second surface of the carrier 10, wherein the first auxiliary layer 40 and the second auxiliary layer 41 are respectively located on both sides of the carrier 10, and the second auxiliary layer 41 can prevent light with a wavelength below 380nm from passing through. The first auxiliary layer 40 can prevent light with a wavelength of 380nm~345nm from passing through; or, can prevent light with a wavelength of 370nm~355nm from passing through; the second auxiliary layer 41 can prevent light with a wavelength of 380nm~345nm from passing through; or, can prevent light with a wavelength of 370nm~355nm from passing through.

[0037] In the present application, the reason why an auxiliary layer is provided on the first surface and / or the second surface of the carrier 10 is because the auxiliary layer can prevent the exposure light from interfering with each other when preparing the focusing layer and the image layer. When the first auxiliary layer 40 and / or the second auxiliary layer 41 are provided, when the focusing layer and the image layer are prepared on both sides of the carrier 10 at the same time, the wavelength light near the exposed I line will not affect the preparation of the other layer, which is more conducive to production and the alignment accuracy is more guaranteed.

[0038] like Figure 1~2 As shown, the second surface of the carrier 10 is provided with an optical layer, and grooves are formed on the surface of the optical layer. The grooves constitute micro-image units 31, thereby forming the image layer. The grooves are formed by exposure and development. Since the grooves are filled with air, there is a refractive index difference between the carrier 10 (or the second auxiliary layer 41) and the optical layer, so the grooves can show micro-images.

[0039] In one embodiment, if Figure 3 As shown, the groove is filled with a colored material and / or a material having a refractive index difference with the graphic layer to form a micro graphic unit 32. The colored material can be a color ink, a dye, etc., and the material having a refractive index difference can be a polymer, a colored polymer, etc., as long as it can have a refractive index difference with the graphic layer. Preferably, the material has a larger refractive index difference.

[0040] like Figure 5 to Figure 7As shown, a main process preparation schematic diagram of a method for preparing an imaging film with an optical spacer layer is prepared, wherein an optical spacer layer is prepared, the optical spacer layer includes a carrier 10 and a first auxiliary layer 40, the carrier 10 includes a first surface and a second surface arranged oppositely, the carrier 10 can be a transparent material such as PET, PE, PC, PMMA, glass, etc., the first auxiliary layer 40 is arranged on the first surface of the carrier 10, and the first auxiliary layer 40 can prevent light with a wavelength below 380nm from passing through; a first optical layer 20 is arranged on the side of the first auxiliary layer 40 away from the carrier 10, and a second optical layer 30 is arranged on the second surface of the carrier 10; due to the presence of the first auxiliary layer 40, when light with a wavelength near the I line (365nm) is used to irradiate the first optical layer 20 and the second optical layer 30 through a film or a mask, the light on both sides will not affect the optical layer of the other layer. After the first optical layer 20 and the second optical layer 30 are exposed and developed, the first optical layer forms a focusing layer intermediate 21, and the second optical layer 30 forms a graphic layer; the focusing layer intermediate 21 forms a focusing layer after being baked. Since the first auxiliary layer 40 only prevents light with a wavelength below 380nm from passing through, light in other bands can still pass through the first auxiliary layer 40, the focusing layer includes a plurality of focusing units 22, and the graphic layer includes a plurality of micro-graphic units 31 formed by grooves. The micro-graphic units 31 are formed by grooves, so that the grooves are equivalent to air with a refractive index of 1. The refractive index of the second optical layer (or graphic layer) is greater than 1, so there is a refractive index difference, and the graphic layer can see the image of the micro-graphic; of course, the micro-graphic unit can also be composed of a convex structure. The focusing unit 22 is a microlens or a cylindrical lens, and the focusing unit 22 is matched with the micro-image unit 31 to form an enlarged image. At this time, the enlarged image is formed on one side of the focusing unit. Of course, a reflective layer can also be provided on the surface of the focusing unit, so that the enlarged image will be formed on one side of the micro-image unit.

[0041] like Figure 3 As shown in the figure, another graphic layer structure, in Figure 7 On the basis of Figure 7 The grooves of the graphic layer are filled with colored materials and / or materials with a refractive index difference with the second optical layer (or graphic layer), forming another structure of the micro graphic unit 32, forming a new graphic layer. This structure is just an extension of the above embodiment. The grooves can also be graphic layers without being filled. Different graphic layers can still be formed by filling the grooves with materials. Of course, the micro graphic unit can also be composed of a raised structure.

[0042] like Figure 8As shown, a schematic diagram of roll-to-roll preparation of an optical imaging film is given, wherein an optical spacing layer 100 having a first optical layer and a second optical layer is disposed between rollers 300, so that the film is rolled and unrolled by the rollers 300, and a mask plate 200 and a mask plate 201 are disposed on both sides of the optical spacing layer 100, respectively, so that light is irradiated onto the optical spacing layer 100 through the mask plate 200 and the mask plate 201, because an auxiliary layer is disposed on the surface of the optical spacing layer, or the optical spacing layer 100 has the function of preventing light with a wavelength below 385nm from passing through, so the light on both sides will not affect the optical layer on the other side, so that as long as the mask plate 200 and the mask plate 201 are aligned, although it is roll-to-roll production, the alignment error will not be affected by the time of the roll-to-roll production, because the mask plate 200 and the film 201 do not move at all, so the alignment error will not change, which is more conducive to large-scale production.

[0043] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail above in conjunction with the accompanying drawings. In the above description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described above, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed above. In addition, the various technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, all possible combinations of the various technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0044] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. An optical imaging film, characterized in that: include: An optical spacing layer, the optical spacing layer comprising a carrier and a first auxiliary layer, the carrier comprising a first surface and an oppositely disposed second surface, the first auxiliary layer being located on one surface of the carrier; A focusing layer, the focusing layer is located on one side of the first surface of the carrier, and the focusing layer includes a plurality of focusing units; A graphic layer, the graphic layer is located on one side of the second surface of the carrier, and the graphic layer includes a plurality of micro graphic units; Wherein, the first auxiliary layer can prevent light with a wavelength below 380nm from passing through; the focusing unit is matched with the micro-image unit to form an enlarged image.

2. An optical imaging film according to claim 1, characterized in that: An optical layer is disposed on the second surface of the carrier, grooves are formed on the surface of the optical layer, and the grooves constitute micro-image and text units, thereby forming the image and text layer.

3. An optical imaging film according to claim 2, characterized in that: The grooves are filled with colored materials and / or materials having a refractive index difference with the graphic layer to form micro graphic units.

4. The optical imaging film according to claim 1, characterized in that: The focusing unit is a microlens or a cylindrical mirror.

5. The optical imaging film according to claim 1, characterized in that: It also includes a second auxiliary layer, which is located on one surface of the carrier, wherein the first auxiliary layer and the second auxiliary layer are respectively located on both sides of the carrier, and the second auxiliary layer can prevent light with a wavelength below 380nm from passing through.

6. The optical imaging film according to claim 1, characterized in that: The focusing unit and the micro-image unit are formed by exposure and development.

7. The optical imaging film according to claim 1, characterized in that: The carrier is one of PET, PC, PMMA, glass and PE.

8. The optical imaging film according to claim 1, characterized in that: The first auxiliary layer can prevent light with a wavelength of 380nm to 345nm from passing through; or, can prevent light with a wavelength of 370nm to 355nm from passing through.

9. The optical imaging film according to claim 5, characterized in that: The second auxiliary layer can prevent light with a wavelength of 380nm to 345nm from passing through; or, can prevent light with a wavelength of 370nm to 355nm from passing through.

10. The optical imaging film according to claim 1, characterized in that: The focusing units are periodically arranged on one side of the first surface of the carrier, or randomly arranged on one side of the first surface of the carrier.

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