Transflective holographic image independent regulation and control template and preparation method

Abstract

The invention provides a transflective holographic image independent regulation and control template and a preparation method thereof. The transflective holographic image independent regulation and control template comprises a first side and a second side which are opposite to each other, and when light of the light source enters the transflective holographic image independent regulation and control template from the first side and the second side respectively, the transflective holographic image independent regulation and control template generates different reflection holographic images and transmission holographic images on the first side and the second side. Therefore, different first reflection holographic images and first transmission holographic images can be generated when the light source irradiates the front face of the transmission and reflection holographic image independent regulation and control template, different second reflection holographic images and second transmission holographic images can also be generated when the light source irradiates the back face of the transmission and reflection holographic image independent regulation and control template, the information capacity of the anti-counterfeit label is effectively increased, and therefore the anti-counterfeit capacity of the anti-counterfeit label is improved.

Description

Technical Field

[0001] The present application relates to the field of optical holographic technology, and in particular to a transflective holographic image independent control template and a preparation method thereof. Background Art

[0002] An anti-counterfeiting label is a mark used to indicate the authenticity of a product and prevent it from being counterfeited. It is made using special anti-counterfeiting technology and is intended to protect the interests of companies and consumers and maintain the stability of the market order. However, a single anti-counterfeiting label can usually only display a holographic pattern through transmission or reflection, which limits the amount of information they can carry and may affect their anti-counterfeiting effectiveness. Summary of the invention

[0003] In order to overcome the technical problems mentioned in the above technical background, an embodiment of the present application provides a transflective holographic image independently controllable template, wherein the transflective holographic image independently controllable template includes a first side and a second side relative to each other, and when light from a light source is incident on the transflective holographic image independently controllable template from the first side and the second side respectively, the transflective holographic image independently controllable template generates different reflective holographic images and transmitted holographic images on the first side and the second side.

[0004] In a possible implementation, the reflective holographic image includes a first reflective holographic image, and the transmissive holographic image includes a first transmissive holographic image. When light from a light source is incident on the transmissive-reflective holographic image independent control template from the first side, the transmissive-reflective holographic image independent control template generates a first reflective holographic image on the first side, and the transmissive-reflective holographic image independent control template generates a first transmissive holographic image on the second side, wherein the first reflective holographic image is different from the first transmissive holographic image.

[0005] In a possible implementation, the reflection holographic image further includes a second reflection holographic image, and the transmission holographic image further includes a second transmission holographic image, when light from a light source is incident on the transflective holographic image independent control template from the second side, the transflective holographic image independent control template generates a second reflection holographic image on the second side, and the transflective holographic image independent control template generates a second transmission holographic image on the first side, wherein the second reflection holographic image is different from the second transmission holographic image; The first reflective holographic image is different from the second reflective holographic image, and the first transmissive holographic image is mirror-symmetrical to the second transmissive holographic image.

[0006] In a possible implementation, the transflective holographic image independent control template includes: substrate; A first micro-nano structure is located on the substrate; A reflective film covering a side of the first micro-nano structure away from the substrate; The second micro-nano structure is located on a side of the reflective film away from the substrate.

[0007] In a possible implementation manner, the surface of the first micro-nano structure includes a plurality of first steps, and the reflective film covers a side of the first micro-nano structure away from the substrate along an extension direction of the first steps.

[0008] In a possible implementation manner, the surface of the second micro-nano structure includes a plurality of second steps, and the width of the first step and the second step is 400 nm to 600 nm.

[0009] In a possible implementation, the transflective holographic image independently controllable template includes a first side and a second side relative to each other, wherein the side where the substrate is located is the first side, and when light from a light source is incident on the transflective holographic image independently controllable template from the first side, the transflective holographic image independently controllable template generates a first reflective holographic image on the first side, and the transflective holographic image independently controllable template generates a first transmission holographic image on the second side, wherein the first reflective holographic image is different from the first transmission holographic image.

[0010] In a possible implementation, when the light of the light source is incident on the transflective holographic image independently regulated template from the second side, the transflective holographic image independently regulated template generates a second reflective holographic image on the second side, and the transflective holographic image independently regulated template generates a second transmissive holographic image on the first side, wherein the second reflective holographic image is different from the second transmissive holographic image; The first reflective holographic image is different from the second reflective holographic image, and the first transmissive holographic image is mirror-symmetrical to the second transmissive holographic image.

[0011] In a possible implementation manner, the substrate is a transparent substrate; The reflective film is a metal reflective film.

[0012] In a possible implementation manner, the refractive index of the first micro-nano structure and the second micro-nano structure is 1.4-1.6.

[0013] In a possible implementation, the transflective holographic image independent control template further includes a protective layer; The protective layer is disposed on a side of the second micro-nano structure away from the substrate; Wherein, the refractive index of the protective layer is different from the refractive index of the second micro-nano structure.

[0014] Another object of the present application is to provide a method for preparing a transflective holographic image independently controllable template, the method for preparing a transflective holographic image independently controllable template is used to prepare a plurality of the transflective holographic image independently controllable templates provided by the present application, the method comprising: providing a substrate; Coating a first embossing adhesive on the substrate; Using a reflective imprint template to imprint on the first imprint adhesive to form a first micro-nano structure; coating a reflective film on the first micro-nano structure; coating a second embossing adhesive on the reflective film; A second micro-nano structure is formed by embossing the second embossing adhesive using a transmission embossing template, and the substrate, the first micro-nano structure, the reflective film and the second micro-nano structure form the independent control template for the transflective holographic image.

[0015] In a possible implementation manner, before the step of providing a substrate, the method further includes: Decomposing the reflection holographic image and the transmission holographic image to be formed into discrete defocused light spots respectively; Calculating the phase required to generate the defocused light spot; Based on the phase required by the defocused light spot, calculating a reflection holographic phase distribution corresponding to the reflection holographic image and a transmission holographic phase distribution corresponding to the transmission holographic image; A reflective imprint template and a transmissive imprint template are manufactured based on the reflective holographic phase distribution and the transmissive holographic phase distribution, respectively.

[0016] In a possible implementation, in the step of calculating the phase required to generate the defocused light spot, the method includes: The phase formula used to generate the defocused light spot is: in, represents the defocused spot, represents the phase required to produce a defocused spot, is the incident wavelength, represents the focal length of the defocused light spot, and Indicates the defocused light spot along x and y The coordinate position of the direction; The phase required for the reflection holographic image to correspond to the defocused light spot and the phase required for the transmission holographic image to correspond to the defocused light spot are calculated according to the phase formula.

[0017] In a possible implementation, in the step of calculating the reflection holographic phase distribution corresponding to the reflection holographic image and the transmission holographic phase distribution corresponding to the transmission holographic image based on the phase required by the defocused light spot, the method includes: Based on the phase required by the reflection hologram to correspond to the defocused light spot and the phase required by the transmission hologram to correspond to the defocused light spot, an electric field of the reflection hologram corresponding to the defocused light spot and an electric field of the transmission hologram corresponding to the defocused light spot are obtained; The electric fields of all the defocused light spots corresponding to the reflection hologram and the electric fields of all the defocused light spots corresponding to the transmission hologram are accumulated respectively, and then the phase part is taken to obtain the reflection holographic phase distribution corresponding to the reflection hologram and the transmission holographic phase distribution corresponding to the transmission hologram.

[0018] In a possible implementation, in the step of respectively accumulating the electric fields of all the defocused light spots corresponding to the reflection holographic image and the electric fields of all the defocused light spots corresponding to the transmission holographic image and then taking the phase part to obtain a reflection holographic phase distribution corresponding to the reflection holographic image and a transmission holographic phase distribution corresponding to the transmission holographic image, the method includes: The formula of holographic phase distribution adopted by respectively accumulating the electric fields of all the defocused light spots corresponding to the reflected holographic image and the electric fields of all the defocused light spots corresponding to the transmitted holographic image and then taking the phase part is: in, represents the holographic phase distribution, arg represents the phase, N represents the total number of defocused spots, represents the defocused spot, represents the phase required to produce a defocused spot; The reflection holographic phase distribution corresponding to the reflection holographic image and the transmission holographic phase distribution corresponding to the transmission holographic image are calculated according to the holographic phase distribution formula.

[0019] In a possible implementation, in the step of respectively producing a reflective imprint template and a transmissive imprint template based on the reflective holographic phase distribution and the transmissive holographic phase distribution, the method includes: Calculating the corresponding reflection groove depth based on the reflection holographic phase distribution, and calculating the corresponding transmission groove depth based on the transmission holographic phase distribution; Rectangular grooves are made on the imprint template according to the depth of the reflective groove and the depth of the transmissive groove to form a reflective imprint template and a transmissive imprint template respectively.

[0020] In a possible implementation, in the step of calculating the corresponding reflection groove depth based on the reflection holographic phase distribution and calculating the corresponding transmission groove depth based on the transmission holographic phase distribution, the method includes: The formula for calculating the corresponding reflection groove depth based on the reflection holographic phase distribution is: in, represents the reflection holographic phase distribution, is the incident wavelength, represents the refractive index of the first imprinting glue; The formula for calculating the corresponding transmission groove depth based on the transmission holographic phase distribution is: in, represents the transmission holographic phase distribution, is the incident wavelength, represents the refractive index of the second imprinting glue.

[0021] Based on any of the above aspects, the embodiments of the present application provide a transflective holographic image independent control template and a preparation method thereof. Thus, through the above scheme, when a light source is used to illuminate the front side of the transflective holographic image independent control template, different first reflection holographic images and first transmission holographic images can be generated, and when the back side is illuminated, different second reflection holographic images and second transmission holographic images can also be generated, effectively increasing the information capacity of the anti-counterfeiting label, thereby improving its anti-counterfeiting ability. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 A schematic diagram of a transflective holographic image independent control template provided in this embodiment; Figure 2 A schematic diagram of a reflective imprint template provided in this embodiment; Figure 3 A schematic diagram of a transmission imprint template provided in this embodiment; Figure 4 A step diagram of a method for preparing a transflective holographic image independently controllable template provided in this embodiment; Figure 5a and Figure 5b for Figure 4 The corresponding process diagram; Figure 6 for Figure 4 The process flow chart corresponding to step S130; Figure 7 for Figure 4 The process flow chart corresponding to step S160; Figure 8 for Figure 4 Schematic diagram of the steps before step S110; Fig. 9 for Figure 8 The sub-step flow chart of S90; Fig.10 for Figure 8 Schematic diagram of the sub-step flow chart of S100.

[0024] Icon: 1-transmissive and reflective holographic image independent control template, 2-reflective imprint template, 3-transmissive imprint template, 10-substrate, 20-first micro-nano structure, 200-first step, 30-reflective film, 40-second micro-nano structure, 400-second step, 50-first imprint glue, 60-second imprint glue. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0027] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0028] In the description of this application, it should be noted that the terms "upper", "lower", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the application is usually placed when in use, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0029] It should be noted that, in the absence of conflict, different features in the embodiments of the present application may be combined with each other.

[0030] In order to solve the technical problems mentioned in the aforementioned background technology, the inventor innovatively designed the following technical solution, and the specific implementation solution of the present application will be described in detail below with reference to the accompanying drawings.

[0031] The transflective holographic image independently controllable template includes a first side and a second side opposite to each other. When light from a light source is incident on the transflective holographic image independently controllable template from the first side and the second side respectively, the transflective holographic image independently controllable template generates different reflective holographic images and transmissive holographic images on the first side and the second side.

[0032] Exemplarily, when light from a light source is incident on the transflective holographic image independently controllable template from the first side, the transflective holographic image independently controllable template generates a first reflective holographic image on the first side, and the transflective holographic image independently controllable template generates a first transmissive holographic image on the second side, wherein the first reflective holographic image is different from the first transmissive holographic image.

[0033] Exemplarily, when the light from the light source is incident on the transflective holographic image independently regulated template from the second side, the transflective holographic image independently regulated template generates a second reflective holographic image on the second side, and the transflective holographic image independently regulated template generates a second transmissive holographic image on the first side, wherein the second reflective holographic image is different from the second transmissive holographic image; The first reflective holographic image is different from the second reflective holographic image, and the first transmissive holographic image is mirror-symmetrical to the second transmissive holographic image.

[0034] For further information, see Figure 1 , Figure 1 The schematic diagram of a transflective holographic image independent control template 1 provided in this embodiment. The transflective holographic image independent control template 1 includes a substrate 10, a first micro-nano structure 20, a reflective film 30, and a second micro-nano structure 40.

[0035] The first micro-nano structure 20 is located on the substrate 10, and the reflective film 30 covers the side of the first micro-nano structure 20 away from the substrate 10. The second micro-nano structure 40 is located on the side of the reflective film 30 away from the substrate 10.

[0036] In this embodiment, the first micro-nano structure 20 is formed by embossing a first embossing adhesive 50 and a reflective embossing template 2 , and the second micro-nano structure 40 is formed by embossing a second embossing adhesive 60 and a transmissive embossing template 3 .

[0037] It is worth noting that the first micro-nano structure and the second micro-nano structure provided in this embodiment can be replaced by a super surface structure.

[0038] In this embodiment, one side of the substrate is the first side, and one side of the second micro-nano structure is the second side. Since there is a certain processing error between the reflective imprint template and the transmission imprint template actually processed in this embodiment and the designed reflective imprint template and the transmission imprint template, the first micro-nano structure and the second micro-nano structure imprinted by the reflective imprint template and the transmission imprint template may have +1, 0, and -1 diffraction orders. The +1 order is a defocused light spot, the 0 order is a light source that has not been modulated by the first micro-nano structure 20 or the second micro-nano structure 40, and the -1 order is a focused light spot.

[0039] When the transmissive-reflective holographic image independent control template is irradiated from the first side toward the side of the second micro-nano structure by a light source, different first reflective holographic images and first transmissive holographic images without crosstalk are generated.

[0040] When the light source is used to illuminate the transflective holographic image independent control template from the second side toward the side of the substrate, a different second reflective holographic image and a second transmissive holographic image without crosstalk are generated. Since the reflective holographic phase distribution provided by the reflective imprint template is Reflection holographic phase distribution corresponding to the first reflection holographic image On the contrary, a focused second reflection hologram of order -1 will appear, and the first reflection hologram is different from the second reflection hologram.

[0041] The transmission holographic phase distribution provided by the transmission imprint template is Transmission holographic phase distribution corresponding to the second transmission holographic image There is a difference of a proportional coefficient, so the +1st, 0th, and -1st diffraction orders exist at the same time, resulting in a second transmission holographic image of a virtual image and a second transmission holographic image of a real image.

[0042] It is worth noting that the first reflection holographic image, the first transmission holographic image, the second reflection holographic image and the second transmission holographic image are determined according to the images of the reflection imprint template and the transmission imprint template respectively, and are not specifically limited here and need to be produced according to actual needs. In addition, the difference between the virtual image and the real image is that the virtual image appears to be inside the transmission reflection holographic image independent control template, while the real image appears to be on the surface of the transmission reflection holographic image independent control template.

[0043] For further information, see Figure 1 , Figure 2 and Figure 3 , Figure 2 A schematic diagram of a reflective imprint template 2 provided in this embodiment, Figure 3 Schematic diagram of the transmission imprint template 3 provided in this embodiment. The surface of the first micro-nano structure 20 includes a plurality of first steps 200 , and the reflective film 30 covers the side of the first micro-nano structure 20 away from the substrate 10 along the extension direction of the first steps 200 .

[0044] In this embodiment, since there are multiple rectangular grooves on the side of the reflective imprint template 2 close to the first imprint adhesive 50, when the reflective imprint template 2 is imprinted with the first imprint adhesive 50, a plurality of steps will be formed on the surface of the first imprint adhesive 50 accordingly, and then cured by ultraviolet light or other conditions to form the first micro-nano structure 20, and the reflective film 30 covers the first micro-nano structure 20 along the extension direction of the first step 200.

[0045] For further information, see Figure 1 The surface of the second micro-nano structure 40 includes a plurality of second steps 400, and the widths of the first step 200 and the second step 400 are L It is 400nm~600nm.

[0046] In this embodiment, since there are multiple rectangular grooves on the side of the transmission imprint template 3 close to the second imprint glue 60, when the transmission imprint template 3 is imprinted with the second imprint glue 60, a plurality of steps will also be formed on the surface of the second imprint glue 60, and then the second micro-nano structure 40 will be formed by curing under ultraviolet rays or other conditions.

[0047] It is worth noting that the width of the first step 200 and the second step 400 is L That is, the side length of the rectangular groove, the width of the first step 200 and the second step 400 L is 400nm~600nm. For example, the width of the first step 200 and the second step 400 is L 400nm, 450nm, 500nm, 550nm, 600nm.

[0048] Further, the substrate 10 is a transparent substrate; The reflective film 30 is a metal reflective film.

[0049] In this embodiment, the substrate 10 may be a transparent flexible plastic, such as PET (polyethylene terephthalate) or PDMS (polydimethylsiloxane), etc. The reflective film 30 may be a metal such as aluminum, silver, gold or silicon, etc., which is not specifically limited here.

[0050] Furthermore, the refractive index of the first micro-nano structure 20 and the second micro-nano structure 40 is 1.4-1.6.

[0051] In this embodiment, the refractive index of the first micro-nano structure 20 and the second micro-nano structure 40 is 1.4-1.6. By way of example, the refractive index of the first micro-nano structure 20 and the second micro-nano structure 40 is 1.4, 1.5, and 1.6.

[0052] Furthermore, the transflective holographic image independently controllable template 1 further includes a protective layer, which is disposed on a side of the second micro-nano structure 40 away from the substrate 10 , wherein the refractive index of the protective layer is different from the refractive index of the second micro-nano structure.

[0053] In this embodiment, the transflective holographic image independent control template 1 can also be provided with a protective layer on the side of the second micro-nano structure 40 away from the substrate 10, and the protective layer has a refractive index of The refractive index of the third embossing glue is Refractive index of the first imprinting glue and the refractive index of the second imprinting glue The protective layer makes the surface of the second micro-nano structure 40 flat. It is worth noting that the transmission groove depth of the transmission imprint template 3 for making the second micro-nano structure 40 under this template is .

[0054] Based on the same inventive concept, another object of the present application is to provide a method for preparing a transflective holographic image independently controllable template, which is used to prepare a plurality of the transflective holographic image independently controllable templates 1 provided by the present application. Figure 4 , Figure 5a and Figure 5b , Figure 6 and Figure 7 , Figure 4 A schematic diagram of the steps of a method for preparing a transflective holographic image independent control template provided in this embodiment, Figure 5a and Figure 5b for Figure 4 The corresponding process diagram, Figure 6 for Figure 4 The process flow chart corresponding to step S130, Figure 7 for Figure 4The process flow chart corresponding to step S160 in FIG. 1 is a process for preparing a transflective holographic image independent control template, comprising the following steps: Step S110 , providing a substrate 10 .

[0055] In this embodiment, the substrate 10 may be a transparent substrate. The substrate 10 may be made of materials including glass, polymer materials, silicon-based materials, quartz, etc. These materials have good optical transparency and certain mechanical strength.

[0056] Step S120 , coating a first embossing adhesive 50 on the substrate 10 .

[0057] In this embodiment, the thickness of the first embossing glue 50 needs to be greater than the maximum depth of the rectangular grooves in the reflective embossing template 2 to ensure that the reflective embossing template 2 is completely replicated.

[0058] Step S130 , using the reflective imprint template 2 to imprint on the first imprint glue 50 to form the first micro-nano structure 20 .

[0059] In this step, after the reflective imprint template 2 is imprinted on the first imprint glue 50 , it is usually necessary to cure it under ultraviolet light or other conditions to form the first micro-nano structure 20 .

[0060] Step S140 , coating a reflective film 30 on the first micro-nano structure 20 .

[0061] In this embodiment, the reflective film 30 can be a metal such as aluminum or silver, and the material of the reflective film 30 is not specifically limited here. In addition, the thickness of the reflective film 30 needs to be set according to the light intensity requirements of the reflected holographic image and the transmitted holographic image. For example, when it is necessary to enhance the intensity of the reflected light, it can be achieved by enhancing the thickness of the reflective film 30. However, if the reflective film 30 is too thick, the thickness of the reflective film 30 deposited on the first micro-nano structure 20 will be inconsistent, which may cause the first micro-nano structure 20 to deform, causing crosstalk between the reflected holographic image and the transmitted holographic image, and affecting the quality and resolution of the overall holographic image.

[0062] Step S150 , coating a second embossing adhesive 60 on the reflective film 30 .

[0063] In this embodiment, the thickness of the second embossing glue 60 needs to be greater than the maximum depth of the rectangular grooves in the transmission embossing template 3 to ensure that the transmission embossing template 3 is completely replicated.

[0064] It is worth noting that the first embossing adhesive 50 and the second embossing adhesive 60 may be the same.

[0065] Step S160 , using the transmission imprint template 3 to imprint the second imprint glue 60 to form the second micro-nano structure 40 , the substrate 10 , the first micro-nano structure 20 , the reflective film 30 and the second micro-nano structure 40 form a transflective holographic image independent control template 1 .

[0066] In this embodiment, after the transmission imprint template 3 is imprinted on the second imprint glue 60 , it is usually necessary to cure it under ultraviolet rays or other conditions to form the second micro-nano structure 40 .

[0067] It is worth noting that the first micro-nano structure 20 and the second micro-nano structure 40 do not need to be precisely aligned.

[0068] Through the above steps, the substrate 10, the first micro-nano structure 20, the reflective film 30 and the second micro-nano structure 40 form a transflective holographic image independent control template 1, thereby achieving precise control of the reflective holographic image and the transmissive holographic image.

[0069] In this embodiment, since the holographic phase distribution (including the reflection holographic phase distribution and the incident holographic phase distribution) is inversely proportional to the incident wavelength, and the groove depth of the imprint template (including the reflection imprint template 2 and the transmission imprint template 3) is proportional to the incident wavelength and the holographic phase distribution, achromatic imaging can be achieved in a wider incident spectrum range. By coating a layer of reflective film 30 on the first micro-nano structure 20 and then coating the second imprint glue 60, the transmission optical path is equal everywhere, so the phase of the transmitted light is not controlled, but the reflected light is still controlled by the phase of the first micro-nano structure 20 to produce a reflection holographic image.

[0070] Next, a second micro-nano structure 40 is formed on the reflective film 30, which is specifically used to perform phase control on the transmitted light. In this way, the transmitted light is only affected by the second micro-nano structure 40. This method effectively separates the phase control of the reflected light and the transmitted light, avoiding mutual interference between the two, thereby achieving clear, crosstalk-free transmission holographic imaging.

[0071] For further information, see Figure 8 Before step S110, the method further includes: Step S70: decompose the reflection holographic image and the transmission holographic image to be formed into discrete defocused light spots respectively.

[0072] In this embodiment, the reflection holographic image and the transmission holographic image to be formed are decomposed into a series of discrete defocused light spots, which are distributed in a three-dimensional space, and each defocused light spot has a specific phase.

[0073] Step S80, calculating the phase required to generate a defocused light spot.

[0074] In this step, the purpose of calculating the phase required to generate the defocused light spot is to subsequently calculate the electric field and holographic phase distribution of the defocused light spot corresponding to the reflected holographic image and the defocused light spot corresponding to the transmitted holographic image.

[0075] Step S90, based on the phase required by the defocused light spot, calculate the reflection holographic phase distribution corresponding to the reflection holographic image and the transmission holographic phase distribution corresponding to the transmission holographic image.

[0076] Step S100, a reflective imprint template and a transmissive imprint template are manufactured based on the reflective holographic phase distribution and the transmissive holographic phase distribution respectively.

[0077] In this embodiment, when the front and back surfaces of the template are independently regulated by irradiating the transmissive and reflective holographic images with a light source, a reflective holographic image and a transmissive holographic image without crosstalk can be generated respectively.

[0078] Further, step S80 can be implemented in the following manner.

[0079] First, the phase formula used to generate the defocused spot is: in, represents the defocused spot, represents the phase required to produce a defocused spot, is the incident wavelength, represents the focal length of the defocused light spot, and Indicates the defocused light spot along x and y The coordinate position of the direction.

[0080] Next, the phase required for the reflected holographic image to correspond to the defocused light spot and the phase required for the transmitted holographic image to correspond to the defocused light spot are calculated according to the phase formula.

[0081] Further, please refer to Fig. 9 , step S90 can be implemented in the following manner.

[0082] Sub-step S91, obtaining the electric field of the defocused light spot corresponding to the reflection hologram and the electric field of the defocused light spot corresponding to the transmission hologram based on the phase required by the reflection hologram and the phase required by the transmission hologram to correspond to the defocused light spot.

[0083] In sub-step S92, the electric fields of all defocused light spots corresponding to the reflection hologram and the electric fields of all defocused light spots corresponding to the transmission hologram are accumulated respectively, and then the phase part is taken to obtain the reflection holographic phase distribution corresponding to the reflection hologram and the transmission holographic phase distribution corresponding to the transmission hologram.

[0084] Further, sub-step S92 can be implemented in the following manner.

[0085] First, the electric fields of all defocused light spots corresponding to the reflected holographic image and the electric fields of all defocused light spots corresponding to the transmitted holographic image are accumulated respectively, and then the formula of holographic phase distribution adopted in the phase part is: in, represents the holographic phase distribution, arg represents the phase, N represents the total number of defocused spots, represents the electric field corresponding to the defocused light spot, represents the defocused spot, Represents the phase required to produce a defocused spot.

[0086] Next, the reflection holographic phase distribution corresponding to the reflection holographic image and the transmission holographic phase distribution corresponding to the transmission holographic image are calculated according to the holographic phase distribution formula.

[0087] Further, please refer to Fig.10 , step S100 can be implemented in the following way.

[0088] Sub-step S101, calculating the corresponding reflection groove depth based on the reflection holographic phase distribution, and calculating the corresponding transmission groove depth based on the transmission holographic phase distribution.

[0089] Sub-step S102, making rectangular grooves on the imprint template according to the depth of the reflective groove and the depth of the transmissive groove to form a reflective imprint template and a transmissive imprint template respectively.

[0090] In this embodiment, grooves of different depths are designed on the imprint template to change the optical path of the light wave when it passes through the structure, thereby realizing the control of the light wave phase. First, the groove depths corresponding to the reflective imprint template and the transmissive imprint template are calculated, and then a rectangular groove is formed on the imprint template by micro-nano processing technology. It is worth noting that micro-nano processing technology includes but is not limited to nano-imprint technology, electron beam lithography technology, laser technology, etc.

[0091] In addition, the side length of the rectangular groove is usually determined according to the design requirements and the processing capability of the micro-nano processing equipment. In this embodiment, the side length of the rectangular groove is 400nm~600nm, and illustratively, the side length of the rectangular groove is 400nm, 450nm, 500nm, 550nm, and 600nm.

[0092] It is worth noting that the side length of the rectangular groove determines the maximum diffraction angle of the reflection hologram and the transmission hologram, which is usually no more than ,in, is the incident wavelength, is the side length of the rectangular groove.

[0093] Furthermore, sub-step S101 can be implemented in the following manner.

[0094] First, the reflection holographic phase distribution is calculated to obtain the corresponding reflection groove depth. The formula for the reflection groove depth is: ,in, represents the reflection holographic phase distribution, is the incident wavelength, represents the refractive index of the first imprinting glue.

[0095] Next, the transmission holographic phase distribution is calculated to obtain the corresponding transmission groove depth. The transmission groove depth formula is: ,in, represents the transmission holographic phase distribution, is the incident wavelength, represents the refractive index of the second imprinting glue.

[0096] In summary, the present application provides a transflective holographic image independently controllable template and a preparation method. The transflective holographic image independently controllable template includes a first side and a second side relative to each other. When the light of the light source is incident on the transflective holographic image independently controllable template from the first side and the second side respectively, the transflective holographic image independently controllable template generates different reflection holographic images and transmission holographic images on the first side and the second side. In this way, when the front side of the transflective holographic image independently controllable template is irradiated with a light source, different first reflection holographic images and first transmission holographic images can be generated. When the back side is irradiated, different second reflection holographic images and second transmission holographic images can also be generated, which effectively increases the information capacity of the anti-counterfeiting label, thereby improving its anti-counterfeiting ability.

[0097] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A transflective holographic image independent control template, characterized in that: The transflective holographic image independently controllable template includes a first side and a second side opposite to each other. When light from a light source is incident on the transflective holographic image independently controllable template from the first side and the second side respectively, the transflective holographic image independently controllable template generates different reflective holographic images and transmitted holographic images on the first side and the second side.

2. The transflective holographic image independent control template according to claim 1, characterized in that: The reflective holographic image includes a first reflective holographic image, and the transmissive holographic image includes a first transmissive holographic image. When light from a light source is incident on the transmissive-reflective holographic image independent control template from the first side, the transmissive-reflective holographic image independent control template generates a first reflective holographic image on the first side, and the transmissive-reflective holographic image independent control template generates a first transmissive holographic image on the second side, wherein the first reflective holographic image is different from the first transmissive holographic image.

3. The transflective holographic image independent control template according to claim 2, characterized in that: The reflection holographic image further includes a second reflection holographic image, and the transmission holographic image further includes a second transmission holographic image. When the light of the light source is incident on the transflective holographic image independent control template from the second side, the transflective holographic image independent control template generates a second reflection holographic image on the second side, and the transflective holographic image independent control template generates a second transmission holographic image on the first side, wherein the second reflection holographic image is different from the second transmission holographic image; The first reflective holographic image is different from the second reflective holographic image, and the first transmissive holographic image is mirror-symmetrical to the second transmissive holographic image.

4. The transflective holographic image independent control template according to claim 1, characterized in that: The template includes: substrate; A first micro-nano structure, located on the substrate; A reflective film covering a side of the first micro-nano structure away from the substrate; The second micro-nano structure is located on a side of the reflective film away from the substrate.

5. The transflective holographic image independent control template according to claim 4, characterized in that: The surface of the first micro-nano structure includes a plurality of first steps, and the reflective film covers a side of the first micro-nano structure away from the substrate along an extension direction of the first steps.

6. The transflective holographic image independent control template according to claim 5, characterized in that: The surface of the second micro-nano structure includes a plurality of second steps, and the width of the first steps and the second steps is 400nm-600nm.

7. The independently controllable transflective holographic image template according to any one of claims 4 to 6, characterized in that: The substrate is a transparent substrate; The reflective film is a metal reflective film.

8. The independently controllable transflective holographic image template according to any one of claims 4 to 6, characterized in that: The refractive index of the first micro-nano structure and the second micro-nano structure is 1.4-1.

6.

9. The independently controllable transflective holographic image template according to any one of claims 4 to 6, characterized in that: The transflective holographic image independent control template also includes a protective layer; The protective layer is disposed on a side of the second micro-nano structure away from the substrate; Wherein, the refractive index of the protective layer is different from the refractive index of the second micro-nano structure.

10. A method for preparing a transflective holographic image independently controllable template, the method being used to prepare the transflective holographic image independently controllable template according to any one of claims 4 to 8, characterized in that: The method comprises: providing a substrate; Coating a first embossing adhesive on the substrate; Using a reflective imprint template to imprint on the first imprint adhesive to form a first micro-nano structure; coating a reflective film on the first micro-nano structure; coating a second embossing adhesive on the reflective film; A second micro-nano structure is formed by embossing the second embossing adhesive using a transmission embossing template, and the substrate, the first micro-nano structure, the reflective film and the second micro-nano structure form the transflective holographic image independent control template.

11. The method for preparing a transflective holographic image independently controllable template according to claim 10, characterized in that: Before the step of providing a substrate, the method further comprises: Decomposing the reflection holographic image and the transmission holographic image to be formed into discrete defocused light spots respectively; Calculating the phase required to generate the defocused light spot; Based on the phase required by the defocused light spot, calculating a reflection holographic phase distribution corresponding to the reflection holographic image and a transmission holographic phase distribution corresponding to the transmission holographic image; A reflective imprint template and a transmissive imprint template are respectively manufactured based on the reflective holographic phase distribution and the transmissive holographic phase distribution.

12. The method for preparing a transflective holographic image independently controllable template according to claim 11, characterized in that: In the step of calculating the phase required to generate the defocused light spot, The phase formula used to generate the defocused light spot is: in, represents the defocused spot, represents the phase required to produce a defocused spot, is the incident wavelength, represents the focal length of the defocused light spot, and Indicates the coordinate position of the defocused light spot along the x and y directions; The phase required for the reflection holographic image to correspond to the defocused light spot and the phase required for the transmission holographic image to correspond to the defocused light spot are calculated according to the phase formula.

13. The method for preparing a transflective holographic image independently controllable template according to claim 11, characterized in that: The step of calculating the reflection holographic phase distribution corresponding to the reflection holographic image and the transmission holographic phase distribution corresponding to the transmission holographic image based on the phase required by the defocused light spot comprises: Based on the phase required by the reflection hologram to correspond to the defocused light spot and the phase required by the transmission hologram to correspond to the defocused light spot, an electric field of the reflection hologram corresponding to the defocused light spot and an electric field of the transmission hologram corresponding to the defocused light spot are obtained; The electric fields of all the defocused light spots corresponding to the reflection hologram and the electric fields of all the defocused light spots corresponding to the transmission hologram are accumulated respectively, and then the phase part is taken to obtain the reflection holographic phase distribution corresponding to the reflection hologram and the transmission holographic phase distribution corresponding to the transmission hologram.

14. The method for preparing a transflective holographic image independently controllable template according to claim 13, characterized in that: The step of respectively accumulating the electric fields of all the defocused light spots corresponding to the reflection holographic image and the electric fields of all the defocused light spots corresponding to the transmission holographic image and then taking the phase part to obtain the reflection holographic phase distribution corresponding to the reflection holographic image and the transmission holographic phase distribution corresponding to the transmission holographic image comprises: The formula of holographic phase distribution adopted by respectively accumulating the electric fields of all the defocused light spots corresponding to the reflected holographic image and the electric fields of all the defocused light spots corresponding to the transmitted holographic image and then taking the phase part is: in, represents the holographic phase distribution, arg represents the phase, N represents the total number of defocused spots, represents the defocused spot, represents the phase required to produce a defocused spot; The reflection holographic phase distribution corresponding to the reflection holographic image and the transmission holographic phase distribution corresponding to the transmission holographic image are calculated according to the holographic phase distribution formula.

15. The method for preparing a transflective holographic image independently controllable template according to claim 11, characterized in that: The step of respectively producing a reflective imprint template and a transmissive imprint template based on the reflective holographic phase distribution and the transmissive holographic phase distribution comprises: Calculating the corresponding reflection groove depth based on the reflection holographic phase distribution, and calculating the corresponding transmission groove depth based on the transmission holographic phase distribution; Rectangular grooves are made on the imprint template according to the depth of the reflective groove and the depth of the transmissive groove to form a reflective imprint template and a transmissive imprint template respectively.

16. The method for preparing a transflective holographic image independently controllable template according to claim 15, characterized in that: The step of calculating the corresponding reflection groove depth based on the reflection holographic phase distribution and the step of calculating the corresponding transmission groove depth based on the transmission holographic phase distribution comprises: The formula for calculating the corresponding reflection groove depth based on the reflection holographic phase distribution is: in, represents the reflection holographic phase distribution, is the incident wavelength, represents the refractive index of the first imprinting glue; The formula for calculating the corresponding transmission groove depth based on the transmission holographic phase distribution is: in, represents the transmission holographic phase distribution, is the incident wavelength, represents the refractive index of the second imprinting glue.

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