Manufacturing method of micro-lens array discrete magnified image and optical imaging film

Abstract

The embodiment of the invention provides a manufacturing method of a micro-lens array discrete magnified image and an optical imaging film. The manufacturing method comprises the following steps: determining an initial center point position of each image-text in an image-text layer and an initial period of each image-text; modeling a three-dimensional image to be presented by the optical imaging film to obtain a three-dimensional model; determining the period of each point of the stereoscopic model according to the height of each point of the stereoscopic model; according to the target period of each image-text and the initial center point position of each image-text, adjusting the center point position of each image-text to obtain the target center position of each image-text; obtaining the magnification of each image-text according to the target period of each image-text and the period of the micro lens; making a reference graph of the image-text, and obtaining a target graph of each image-text according to the expected size of each display graph and the corresponding magnification of each image-text; and setting the target pattern of each image-text at a target center position to form an image-text layer.

Description

Technical Field

[0001] The present application relates to the field of optical imaging technology, and in particular to a method for manufacturing a discrete magnified image of a microlens array and an optical imaging film. Background Art

[0002] With the continuous development of imaging technology, stereoscopic imaging (3D imaging) technology has received more and more attention. Among them, imaging technology based on microlens arrays has been applied in many fields such as information, display, anti-counterfeiting and decoration.

[0003] At present, in stereo images with different depths of field, for an enlarged image floating on a plane, the greater the depth of field value, the greater the image magnification, so that the floating stereo image can present a visual effect of near big and far small. Correspondingly, for an enlarged image sinking on a plane, the greater the negative depth of field value, the greater the image magnification, so that the sinking stereo image presents a visual effect of near small and far big.

[0004] However, in the prior art, it is necessary to set certain reference objects for the image formed by the optical imaging film so that people can observe the three-dimensional image effect, which makes the structure of the optical imaging film complicated. Summary of the invention

[0005] The embodiments of the present application provide a method for manufacturing a discrete magnified image of a microlens array and an optical imaging film, which are used to solve the problem of complex structure of optical imaging films in the prior art.

[0006] The present application provides a method for manufacturing a discrete magnified image of a microlens array, which is applied to manufacturing an optical imaging film. The optical imaging film includes a lens layer and an image layer. The image layer includes a plurality of images. The method for manufacturing the image layer includes:

[0007] Determining the initial center point position and initial period of each image and text in the image and text layer according to the position and period of the microlenses in the lens layer;

[0008] Modeling the three-dimensional image to be presented by the optical imaging film to obtain a three-dimensional model;

[0009] Determine the period of each point of the three-dimensional model according to the height of each point of the three-dimensional model;

[0010] Assign the period of each point of the three-dimensional model to the target period of each corresponding image and text, adjust the center point position of each image and text according to the target period of each image and text and the initial center point position of each image and text, and obtain the target center position of each image and text; obtain the magnification of each image and text according to the target period of each image and text and the period of the microlens;

[0011] Create reference graphics for graphics and texts, and obtain target graphics for each graphics and texts according to the expected size of each display graphics and the corresponding magnification of each graphics and texts;

[0012] The target graphics of each image and text are set at the target center position to form an image and text layer.

[0013] In a feasible implementation, the initial center point position of the image corresponds to the center position of the microlens, and the initial period of each image is equal to the period of each microlens.

[0014] In a feasible implementation, a three-dimensional image to be presented by the optical imaging film is modeled to obtain a three-dimensional model, including:

[0015] Determine a reference plane, model the stereoscopic image on the reference plane, and obtain a stereoscopic image. In a feasible implementation, the modeling of the stereoscopic image also includes:

[0016] When the projections of the three-dimensional model on the reference plane have overlapping points, the three-dimensional model needs to be segmented into multiple three-dimensional models, and each three-dimensional model satisfies that the projections on the reference plane have no overlapping points.

[0017] In a feasible implementation, determining the period of each point of the three-dimensional model according to the height of each point of the three-dimensional model includes:

[0018] Defining the depth of field of a stereoscopic model according to its height;

[0019] Calibrate the period difference of each point of the stereo model according to the depth of field;

[0020] The period of each point in the three-dimensional model is determined based on the period difference.

[0021] In a feasible implementation, calibrating the period difference of each point of the stereo model according to the depth of field includes:

[0022] Determine the position of the lowest point of the curved surface of the three-dimensional model;

[0023] When the lowest point of the surface is located above the datum plane:

[0024] The minimum period difference of the three-dimensional model is calculated according to formula (1):

[0025]

[0026] The maximum period difference of the stereo model is calculated according to formula (2):

[0027]

[0028] Among them, O min Indicates the minimum period difference, O maxrepresents the maximum period difference, n1 is the refractive index of the material of the microlens and the image layer, n2 is the refractive index of air, f is the focal length of the microlens, h min is the minimum depth of field, h max is the maximum depth of field, T1 is the initial period of the image and text;

[0029] The period difference of each point on the three-dimensional model is calculated according to formula (3):

[0030] O x =O min +(O max -O min )×(D max -D x ) / (D max -D min ) formula (3);

[0031] Among them, O x represents the period difference of each point on the three-dimensional model, D x Denotes the depth of field at each point on the stereo model, D max Indicates the maximum depth of field, D min Indicates the minimum depth of field, O max Indicates the maximum period difference, O min Indicates the minimum period difference.

[0032] In a feasible implementation, determining the period of each point of the three-dimensional model according to the period difference includes:

[0033] The period of each point on the three-dimensional model is calculated according to formula (4):

[0034] T x =T1+O x Formula (4);

[0035] Among them, T x represents the period of each point on the three-dimensional model, O x It represents the period difference of each point on the three-dimensional model, and T1 represents the initial period of the image.

[0036] In a feasible implementation, the period difference of each point of the stereo model is calibrated according to the depth of field, including:

[0037] Determine the position of the highest point of the curved surface of the three-dimensional model;

[0038] When the highest point of the surface is located below the datum plane:

[0039] The maximum period difference of the stereo model is calculated according to formula (5):

[0040]

[0041] The minimum period difference of the stereo model is calculated according to formula (6):

[0042]

[0043] Among them, O min Indicates the minimum period difference, O max represents the maximum period difference, n1 is the refractive index of the material of the microlens and the image layer, n2 is the refractive index of air, f is the focal length of the microlens, h min is the minimum depth of field, h max is the maximum depth of field, T1 is the initial period of the image and text;

[0044] The period difference of each point on the three-dimensional model is calculated according to formula (7):

[0045] O x =O max -(O max -O min )×(D min -D x ) / (D max -D min ) formula (7);

[0046] Among them, O x represents the period difference of each point on the three-dimensional model, D x Denotes the depth of field at each point on the stereo model, D max Indicates the maximum depth of field, D min Indicates the minimum depth of field, O max Indicates the maximum period difference, O max Indicates the minimum period difference.

[0047] In a feasible implementation, determining the period of each point of the three-dimensional model according to the period difference includes:

[0048] The period of each point on the three-dimensional model is calculated according to formula (8):

[0049] T x =T1-O x Formula (8);

[0050] Among them, T x represents the period of each point on the three-dimensional model, O x It represents the period difference of each point on the three-dimensional model, and T1 represents the initial period of the image.

[0051] In a feasible implementation, a reference graph of the graphics is produced, and a target graph of each graphics is obtained according to the target period of each graphics and the reference graph, including

[0052] The size of the base graphic is smaller than the initial period of the graphic

[0053] According to the target period of each image and text, the magnification rate of each image and text is obtained;

[0054] The magnification M of each image and text is calculated according to formula (9):

[0055]

[0056] Wherein, r represents the ratio of the target period of each image to the period of the microlens; α represents the value of the rotation angle between the array of microlenses and the array of images; and the target pattern of each image is obtained according to the magnification and the reference pattern.

[0057] In a second aspect, an embodiment of the present application provides an optical imaging film, including a lens layer, a spacer layer and a graphic layer.

[0058] The lens layer includes a plurality of micro lenses, and the plurality of micro lenses are arranged in an array;

[0059] The image layer includes a plurality of images, and the image layer is prepared according to the method for making a discrete magnified image of a microlens array according to the first aspect.

[0060] The lens layer and the image layer are respectively arranged on two opposite sides of the spacing layer, and the distance between the image layer and the lens layer meets the focal length range of the microlens.

[0061] The embodiment of the present application provides a method for producing a discrete magnified image of a microlens array, which is applied to producing an optical imaging film. The method for producing a discrete magnified image of a microlens array includes: determining the initial center point position of each image and the initial period of each image in the image layer according to the position and period of the microlenses in the lens layer; modeling the three-dimensional image to be presented by the optical imaging film to obtain a three-dimensional model; determining the period of each point of the three-dimensional model according to the height of each point of the three-dimensional model; assigning the period of each point of the three-dimensional model to the target period of each corresponding image, adjusting the center point position of each image according to the target period of each image and the initial center point position of each image, and obtaining the target center position of each image; obtaining the magnification of each image according to the target period of each image and the period of the microlens; producing a reference graphic of the image, and obtaining the target graphic of each image according to the expected size of each display graphic and the corresponding magnification of each image; setting the target graphic of each image at the target center position to form an image layer. This method for producing discrete magnified images of microlens arrays adopts an asynchronous algorithm that calculates the period and images separately, and can adjust the image size. The image array formed enables the optical imaging film to display images of different depths of field without a reference object, and people can observe three-dimensional and rich image effects.

[0062] The embodiment of the present application also provides an optical imaging film, including a lens layer, a spacer layer and an image layer, wherein the lens layer includes a plurality of microlenses arranged in an array; the image layer includes a plurality of images, and the image layer is prepared according to the method for making a discrete magnified image of a microlens array as in the first aspect, the lens layer and the image layer are respectively arranged on opposite sides of the spacer layer, and the distance between the image layer and the lens layer meets the focal length range of the microlenses. Since the optical imaging film is prepared by any of the technical solutions in the above schemes, it has all the beneficial effects of any of the technical solutions in the above schemes, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] The drawings described herein are used to provide further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present application and do not constitute improper limitations on the present invention.

[0064] In the attached picture:

[0065] Figure 1 It is a flowchart of a method for producing a discrete magnified image of a microlens array provided in one embodiment of the present application;

[0066] Figure 2 is a schematic structural diagram of an optical imaging film provided in one embodiment of the present application;

[0067] Figure 3 is a schematic structural diagram of an optical imaging film provided by another embodiment of the present application;

[0068] Figure 4 This application Figure 3 Schematic diagram of the lens layer in the optical imaging film;

[0069] Figure 5 This application Figure 3 Schematic diagram of the hemispherical model during the fabrication process of the Chinese-English array;

[0070] Figure 6 This application Figure 3 A front view schematic diagram of a three-dimensional image presented by the optical imaging film;

[0071] Figure 7 is a schematic structural diagram of an optical imaging film provided in yet another embodiment of the present application;

[0072] Figure 8 This application Figure 7 Schematic diagram of the front view of the three-dimensional image presented by the optical imaging film.

[0073] Description of reference numerals:

[0074] 100 - lens layer; 110 - microlens; 200 - spacer layer; 300 - image layer; 400 - stereo model; 500 - stereo image. DETAILED DESCRIPTION

[0075] In order to enable those skilled in the art to better understand the technical solutions in this application, the following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of this application.

[0076] In the description of the embodiments of the present application, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, for example, two, three, etc., unless otherwise clearly and specifically defined.

[0077] With the continuous development of imaging technology, stereoscopic imaging (3D imaging) technology has received more and more attention. Among them, imaging technology based on microlens arrays has been applied in many fields such as information, display, anti-counterfeiting and decoration.

[0078] At present, in stereo images with different depths of field, for an enlarged image floating on a plane, the greater the depth of field value, the greater the image magnification, so that the floating stereo image can present a visual effect of near big and far small. Correspondingly, for an enlarged image sinking on a plane, the greater the negative depth of field value, the greater the image magnification, so that the sinking stereo image presents a visual effect of near small and far big.

[0079] However, in the prior art, it is necessary to set certain reference objects for the image so that the image can present a three-dimensional effect.

[0080] In order to solve the problem in the prior art that certain reference objects need to be set for the image so that people can observe the three-dimensional image effect, the embodiment of the present application provides a method for producing a discrete magnified image of a microlens array and an optical imaging film. The solution provided by the embodiment of the present application will be described in detail below in conjunction with the drawings in the specification.

[0081] Figure 1 It is a schematic flow chart of a method for producing a discrete magnified image of a microlens array provided in one embodiment of the present application.

[0082] First, refer to Figure 1As shown, the embodiment of the present application provides a method for manufacturing a discrete magnified image of a microlens array, which is applied to manufacturing an optical imaging film. The optical imaging film includes a lens layer 100 and an image layer 300. The image layer 300 has a plurality of images. The manufacturing method of the image layer 300 includes:

[0083] S100: determining the initial center point position of each image and text in the image and text layer and the initial period of each image and text according to the position and period of the microlenses in the lens layer;

[0084] In order to ensure the imaging effect, the image layer 300 in the optical imaging film is arranged corresponding to the position of the lens layer 100. Specifically, each image in the image layer 300 is arranged in one-to-one correspondence with the position of each microlens 110 in the lens layer 100, so that the center point position of each image in the image layer 300 and the initial period of each image can be determined according to the position and period of each microlens 110 in the lens layer 100. It should be noted that the period of the microlens 110 refers to the distance between adjacent microlenses 110 in the lens array in the lens layer 100, and accordingly, the image period refers to the distance between adjacent images in the image layer 300.

[0085] S200 : Modeling the three-dimensional image 500 to be presented by the optical imaging film to obtain a three-dimensional model 400 .

[0086] Modeling is performed according to the outline of the stereoscopic image 500. First, a reference plane is determined, and then the stereoscopic image 500 is modeled on the reference plane to obtain a stereoscopic model 400; wherein all points on the surface of the stereoscopic model 400 can be vertically projected on the reference plane, and it is necessary to ensure that all points on the surface of the stereoscopic model 400 do not overlap on the reference plane. If there are overlapping points in the projection of the stereoscopic model 400 on the reference plane, the stereoscopic model 400 needs to be segmented into multiple stereoscopic models 400 so that each stereoscopic model 400 satisfies the requirement of not having overlapping points in the projection on the reference plane.

[0087] S300 : determining the period of each point of the three-dimensional model 400 according to the height of each point of the three-dimensional model 400 .

[0088] Exemplarily, the depth of field of the stereoscopic model 400 is defined according to the height of the stereoscopic model 400; the depth of field refers to the distance of the stereoscopic image 500 relative to the reference plane. The graphic cycle obtained in step S100 is deformed to conform to the periodic data of the depth of field of the stereoscopic figure. It can be understood that for a stereoscopic image floating on a plane, it has a positive depth of field, and the floating stereoscopic image 500 can present a visual effect of near large and far small, which conforms to the human eye's spatial perception of three-dimensional objects. Similarly, for a stereoscopic image sinking in a plane, it has a negative depth of field, and the presented sinking stereoscopic image 500 presents a visual effect of near small and large.

[0089] Exemplarily, the period difference of each point of the stereo model 400 is calibrated according to the depth of field.

[0090] When the depth of field of the stereoscopic image 500 is different, the period difference of each point of the stereoscopic model 400 is different. Specifically, there are two cases of positive depth of field and negative depth of field, which are described in detail below.

[0091] When the depth of field value is a positive depth of field, that is, the position of the lowest point of the curved surface in the stereoscopic image 500 is above the reference plane, the specific steps are as follows:

[0092] When the lowest point of the surface is located above the datum plane:

[0093] The minimum period difference of the three-dimensional model 400 is calculated according to formula (1):

[0094]

[0095] The maximum period difference of the three-dimensional model 400 is calculated according to formula (2):

[0096]

[0097] Among them, O min Indicates the minimum period difference, O max represents the maximum period difference, n1 is the refractive index of the material of the microlens 110 and the image layer 300, n2 is the refractive index of air, f is the focal length of the microlens 110, h min is the minimum depth of field, h max is the maximum depth of field; T1 represents the initial period of the image and text.

[0098] The period difference of each point on the three-dimensional model 400 is calculated according to formula (3):

[0099] O x =O min +(O max -O min )×(D max -D x ) / (D max -D min ) formula (3);

[0100] Among them, O x represents the period difference of each point on the three-dimensional model 400, D x represents the depth of field of each point on the three-dimensional model 400, D max Indicates the maximum depth of field, D min Indicates the minimum depth of field, h min Indicates the maximum period difference, h max Indicates the minimum period difference.

[0101] The period of each point on the three-dimensional model 400 is calculated according to formula (4):

[0102] T x =T1+O x Formula (4);

[0103] Among them, T x represents the period of each point on the three-dimensional model 400, O x represents the period difference of each point on the three-dimensional model 400; T1 represents the initial period of the image.

[0104] When the depth of field value is a negative depth of field, that is, the position of the highest point of the curved surface in the stereoscopic image 500 is below the reference plane, the specific steps are as follows:

[0105] When the highest point of the surface is located below the datum plane:

[0106] The maximum period difference of the three-dimensional model 400 is calculated according to formula (5):

[0107]

[0108] The minimum period difference of the three-dimensional model 400 is calculated according to formula (6):

[0109]

[0110] Among them, O min Indicates the minimum period difference, O max represents the maximum period difference, n1 is the refractive index of the material of the microlens 110 and the image layer, n2 is the refractive index of air, f is the focal length of the microlens 110, and h min is the minimum depth of field, h max is the maximum depth of field; T1 represents the initial period of the image and text.

[0111] The period difference of each point on the three-dimensional model 400 is calculated according to formula (7):

[0112] O x =O max -(O max -O min )×(D min -D x ) / (D max -D min ) formula (7);

[0113] Among them, O x represents the period difference of each point on the three-dimensional model 400, D x represents the depth of field of each point on the three-dimensional model 400, D max Indicates the maximum depth of field, D min Indicates the minimum depth of field, O maxIndicates the maximum period difference, O min Indicates the minimum period difference.

[0114] The period of each point on the three-dimensional model 400 is calculated according to formula (8):

[0115] T x =T1-O x Formula (8);

[0116] Among them, T x represents the period of each point on the three-dimensional model 400, O x represents the period difference of each point on the three-dimensional model 400; T1 represents the initial period of the image.

[0117] S400: assigning the period of each point of the three-dimensional model 400 to the target period of each corresponding image, adjusting the center point position of the image according to the target period of the image and the initial center point position of the image, and obtaining the target center position of the image; obtaining the magnification of each image according to the target period of the image and the period of the microlens 110.

[0118] Exemplarily, since the target period of each graphic is the same as the period of each corresponding point of the three-dimensional model 400, the period of each point of the three-dimensional model 400 is assigned to the target period of each corresponding graphic, and the center point position of the graphic is adjusted according to the target period of the graphic and the initial center point position of the graphic to obtain the target center position of the graphic.

[0119] The magnification M of each image and text is calculated according to formula (9):

[0120]

[0121] Wherein, r represents the ratio of the target period of each image to the period of the microlens 110; α represents the value of the rotation angle between the array of the microlens 110 and the array of the image;

[0122] S500: creating a reference graphic of the graphic and text, and obtaining a target graphic of each graphic and text according to the expected size of each display graphic and the corresponding magnification ratio of each graphic and text.

[0123] A reference pattern is produced according to the image-text cycle and the imaging pattern to be displayed. In some embodiments, the size of the reference pattern is smaller than the initial period T1 of the image-text.

[0124] According to the expected size of each display graphic and the corresponding magnification ratio of each graphic, the target graphic of each graphic is obtained. Specifically, the target graphic of each graphic is obtained by dividing the expected size of each display graphic by the magnification ratio M of the graphic.

[0125] S600: forming an image and text layer 300.

[0126] The target graphics of each graphic are set at the target center position to form a graphic layer 300 .

[0127] In some embodiments, the projection of the stereoscopic model 400 on the reference plane has no overlapping points. In other examples, when the projection of the stereoscopic model 400 on the reference plane has overlapping points, the stereoscopic model 400 needs to be segmented into multiple stereoscopic models 400, each of which satisfies the requirement that there are no overlapping points projected on the reference plane, and the color is adjusted according to the selection.

[0128] Figure 2 It is a schematic diagram of the structure of an optical imaging film provided in one embodiment of the present application.

[0129] Reference Figure 2 As shown, in the second aspect, the embodiment of the present application provides an optical imaging film, including a lens layer 100, a spacer layer 200 and a graphic layer 300, the lens layer 100 includes a plurality of microlenses 110, and the plurality of microlenses 110 are arranged in an array; the graphic layer 300 includes a plurality of graphics, and the graphic layer 300 can be prepared according to the method for producing a discrete magnified image of a microlens array as in the first aspect.

[0130] The lens layer 100 and the image layer 300 are respectively arranged on opposite sides of the spacer layer 200, and the distance between the image layer 300 and the lens layer 100 meets the focal length range of the microlens 110. It can be understood that the lens layer 100, the spacer layer 200 and the image layer 300 are stacked in sequence.

[0131] In some examples, the period of the microlenses 110 is 65 μm, and the focal length is 100 μm. That is, the distance between adjacent microlenses 110 in the lens layer 100 is 65 μm, and the focal length of the microlenses 110 is 100 μm.

[0132] In order to better illustrate the method for manufacturing a discrete magnified image of a microlens array and the solution of an optical imaging film provided in the embodiments of the present application, two specific embodiments are provided below for detailed description.

[0133] Embodiment 1:

[0134] Figure 3 is a schematic structural diagram of an optical imaging film provided by another embodiment of the present application; Figure 4 This application Figure 3 Schematic diagram of the lens layer 100 in the optical imaging film.

[0135] Reference Figure 3 and Figure 4As shown, this embodiment provides an optical imaging film, comprising a lens layer 100, a spacer layer 200 and a graphic layer 300 stacked in sequence. The lens layer 100 is arranged on one side of the spacer layer 200, and the graphic layer 300 is arranged on the side of the spacer layer 200 facing away from the lens layer 100, that is, the lens layer 100 and the graphic layer 300 are arranged on opposite sides of the spacer layer 200. The spacer layer 200 is a transparent material, which is used to separate the graphic layer 300 from the lens layer 100, and to bear the structure and transmit light to form an observation area. Exemplarily, the material of the spacer layer 200 can be PET or PC.

[0136] The lens layer 100 is used to magnify the image in the image layer 300, and includes a plurality of micro lenses 110 arranged in an array, and the micro lenses 110 are convex lenses. The thickness of the spacer layer 200 needs to be slightly greater than the reflection focal length of the micro lenses 110, so as to magnify the image in the image layer 300.

[0137] The lens layer 100 includes a plurality of microlenses 110 arranged in an array, and the image layer 300 also includes a plurality of images arranged in an array. Each microlens 110 is provided corresponding to each image, so that the microlens 110 can magnify the pattern structure in the image, so that people can observe the magnified image and obtain a rich visual effect.

[0138] The spacer layer 200 is made of transparent material, the distance between the image layer 300 and the lens layer 100 meets the focal length range of the microlens 110, the period of the microlens 110 is 65 μm, and the focal length is 100 μm. In addition, the multiple images in the image layer 300 are discrete image arrays, and the image period and size in the discrete image array have no corresponding size relationship.

[0139] The method for making the image layer 300 in the above optical imaging film is as follows:

[0140] Step 1: First, determine the center point position of each image in the image layer 300 and the initial period of each image according to the position and period of the microlens 110. In this example, the period of the microlens 110 is 65 μm, so the initial period of the image is 65 μm.

[0141] Step 2: Model the three-dimensional image 500 to be presented by the optical imaging film to obtain a three-dimensional model 400 .

[0142] Figure 5 This application Figure 3 Schematic diagram of the hemispherical model during the array fabrication process.

[0143] In this example, the stereoscopic image 500 to be presented is hemispherical, that is, the overall outline of the stereoscopic model 400 is a hemispherical structure, which can be referred to as Figure 5 shown.

[0144] First, a reference plane is determined, and then the stereoscopic image 500 is modeled on the reference plane using a hemispherical model to obtain a stereoscopic model 400 .

[0145] Step 3: Define the depth of field of the stereoscopic image 500 according to the height of the hemispherical model. In this embodiment, the hemispherical model is a convex hemispherical structure below the plane, that is, the highest point of the hemispherical model is below the plane, and the target period of each image is calculated according to Formula 5-Formula 8. The target period data of each image is less than 65 μm, and the period at the center of the hemispherical model surface is the smallest, and the period at the edge is the largest.

[0146] Specifically, the image period close to the middle of the hemispherical model is smaller, which is 63.91669 μm, and the corresponding depth of field is -4 mm. The image period corresponding to the edge of the sphere is larger, which is 64.45834 μm, and the corresponding depth of field is -8 mm. All periods are smaller than the lens period of 65 μm.

[0147] Step 4: Create discrete graphics according to display requirements. Assuming that the target display graphic is a five-pointed star, the reference graphics are made into a five-pointed star with an initial size of 30 μm, which is smaller than the initial period of the graphics, 65 μm.

[0148] Step 5: Set the size of the five-pointed star to be presented in different areas of the hemispherical model, and scale the discrete graphics in step 4 according to the magnification corresponding to the target period of each graphics, so that the discrete graphics size is divided by the magnification to obtain the target graphics of each graphics. For example, the size of the five-pointed star to be obtained in the center area is 3.5mm, and the size of the five-pointed star to be obtained at the edge is 0.5mm. According to the actual magnified imaging size / magnification = graphics size, the magnification M is calculated to be 60 from the period at the center, and the size of the graphics filled in the period is 4.16μm. The magnification M is calculated to be 120 from the period at the edge, and the size of the graphics filled in the period is 58.33μm.

[0149] Figure 6 This application Figure 3 FIG. 5 is a front view of a three-dimensional image 500 presented by the optical imaging film. Figure 6 As shown, the optical imaging film in the embodiment of the present application can present a hemispherical stereoscopic image 500, and the image magnification size at different positions is different, thereby presenting a realistic stereoscopic image 500 effect. In other embodiments, other stereoscopic models 400 may also be modeled, such as a cylinder, a cone, etc.

[0150] Embodiment 2:

[0151] Figure 7is a schematic structural diagram of an optical imaging film provided in yet another embodiment of the present application; Figure 8 This application Figure 7 FIG. 5 is a front view of a three-dimensional image 500 presented by the optical imaging film.

[0152] Reference Figure 7 and Figure 8 As shown, this embodiment provides an optical imaging film, comprising a lens layer 100, a spacer layer 200, and a graphic layer 300 which are stacked in sequence, wherein the lens layer 100 is arranged on one side of the spacer layer 200, and the graphic layer 300 is arranged on the side of the spacer layer 200 which is not facing the lens layer 100, that is, the lens layer 100 and the graphic layer 300 are respectively arranged on opposite sides of the spacer layer 200. The spacer layer 200 is made of a transparent material, and is used to separate the graphic layer 300 from the lens layer 100, and to form an observation area through a bearing structure and light transmission. In addition, the graphic layer 300 comprises a first graphic layer and a second graphic layer. That is to say, the lens layer 100, the spacer layer 200, the first graphic layer and the second graphic layer are stacked in sequence.

[0153] Different from the first embodiment, the graphic layer 300 in the present embodiment includes a first graphic layer and a second graphic layer which are stacked. For example, the graphic in the first graphic layer is a five-pointed star graphic, and the graphic in the second graphic layer is a heart-shaped graphic. In addition, for example, the five-pointed star graphic can be filled with red ink to form a red five-pointed star 3D image 500; the heart-shaped graphic can be filled with blue ink to form a blue heart-shaped 3D image. Figure 8 As shown, it is a three-dimensional image 500 presented by the optical imaging film including the first image layer and the second image layer.

[0154] In this example, the enlarged stereoscopic image 500 of the first graphic layer is a sunken first hemisphere, and the enlarged stereoscopic image 500 of the second graphic layer is a sunken second hemisphere, which have different diameters and have overlapping areas when projected onto the horizontal plane.

[0155] It is understood that in this embodiment, two different colors of graphic layers 300 are copied by aligning and superimposing to form a two-color three-dimensional sinking image. In other embodiments, the floating image of each area can also be resized according to the above method to form a floating three-dimensional image. The data obtained by the calculation and processing of the two models can also be superimposed and photolithographically processed on a mold to form a graphic layer 300 structure with two three-dimensional images 500, which can display a single-color multi-depth three-dimensional image.

[0156] It is easy to understand that those skilled in the art can combine, split, reorganize, etc. the embodiments of the present application to obtain other embodiments based on the several embodiments provided in the present application, and these embodiments do not exceed the protection scope of the present application.

[0157] The above specific implementation methods further explain in detail the purpose, technical solutions and beneficial effects of the embodiments of the present application. It should be understood that the above are only specific implementation methods of the embodiments of the present application and are not used to limit the protection scope of the embodiments of the present application. Any modifications, equivalent substitutions, improvements, etc. made on the basis of the technical solutions of the embodiments of the present application should be included in the protection scope of the embodiments of the present application.

Claims

1. A method for producing a discrete magnified image of a microlens array, characterized in that: The invention is applied to manufacture an optical imaging film, wherein the optical imaging film comprises a lens layer (100) and a graphic layer (300), wherein the graphic layer (300) comprises a plurality of graphics, and the manufacturing method of the graphic layer (300) comprises: Determining the initial center point position and initial period of each image and text in the image and text layer (300) according to the position and period of the microlenses in the lens layer (100); Modeling the three-dimensional image to be presented by the optical imaging film to obtain a three-dimensional model; Determining the period of each point of the three-dimensional model according to the height of each point of the three-dimensional model; Assigning the period of each point of the three-dimensional model to the target period of each corresponding image, adjusting the center point position of each image according to the target period of each image and the initial center point position of each image to obtain the target center position of each image; obtaining the magnification of each image according to the target period of each image and the period of the microlens; Produce a reference graphic of the graphic, and obtain a target graphic of each graphic according to the expected size of each display graphic and the corresponding magnification of each graphic; The target graphics of each of the graphics are arranged at the center of the target to form the graphics layer (300).

2. The method for producing a discrete magnified image of a microlens array according to claim 1, characterized in that: The initial center point position of each of the graphics corresponds to the center position of each of the microlenses, and the initial period of each of the graphics is equal to the period of the microlenses.

3. The method for producing a discrete magnified image of a microlens array according to claim 1, characterized in that: The step of modeling the three-dimensional image to be presented by the optical imaging film to obtain a three-dimensional model comprises: A reference plane is determined, and the stereoscopic image is modeled on the reference plane to obtain the stereoscopic model, wherein the projection of the stereoscopic model on the reference plane has no overlapping points.

4. The method for producing a discrete magnified image of a microlens array according to claim 3, characterized in that: The step of modeling the three-dimensional image to be presented by the optical imaging film to obtain a three-dimensional model further comprises: When the projections of the three-dimensional model on the reference plane have overlapping points, the three-dimensional model needs to be segmented into a plurality of three-dimensional models, each of which satisfies the requirement that the projections on the reference plane have no overlapping points.

5. The method for producing a discrete magnified image of a microlens array according to claim 3, characterized in that: Determining the period of each point of the three-dimensional model according to the height of each point of the three-dimensional model includes: defining a depth of field of the stereoscopic model according to a height of the stereoscopic model; Calibrate the period difference of each point of the three-dimensional model according to the depth of field; The period of each point of the three-dimensional model is determined according to the period difference.

6. The method for producing a discrete magnified image of a microlens array according to claim 5, characterized in that: The step of calibrating the periodic difference of each point of the three-dimensional model according to the depth of field includes: Determining the position of the lowest point of the curved surface of the three-dimensional model; When the position of the lowest point of the surface is above the reference plane: The minimum period difference of the three-dimensional model is calculated according to formula (1): The maximum period difference of the three-dimensional model is calculated according to formula (2): Among them, O min represents the minimum period difference, O max represents the maximum period difference, n1 is the refractive index of the material of the microlens and the image layer, n2 is the refractive index of air, f is the focal length of the microlens, h min is the minimum depth of field, h max is the maximum depth of field, T1 is the initial period of the image and text; The period difference of each point on the three-dimensional model is calculated according to formula (3): O x = O min +(O max - O min ) × (D max - D x ) / (D max - D min ) Formula (3); Among them, O x represents the period difference of each point on the three-dimensional model, D x Denotes the depth of field of each point on the stereo model, D max Denotes the maximum depth of field, D min represents the minimum depth of field, O max represents the maximum period difference, O min represents the minimum period difference.

7. The method for producing a discrete magnified image of a microlens array according to claim 6, characterized in that: Determining the period of each point of the three-dimensional model according to the period difference includes: The period of each point on the three-dimensional model is calculated according to formula (4): T x =T1+O x Formula (4); Among them, T x represents the period of each point on the three-dimensional model, O x represents the period difference of each point on the three-dimensional model, and T1 represents the initial period of the image.

8. The method for producing a discrete magnified image of a microlens array according to claim 5, characterized in that: The step of calibrating the periodic difference of each point of the three-dimensional model according to the depth of field includes: Determining the position of the highest point of the curved surface of the three-dimensional model; When the highest point of the surface is below the reference plane: The maximum period difference of the three-dimensional model is calculated according to formula (5): The minimum period difference of the three-dimensional model is calculated according to formula (6): Among them, O min represents the minimum period difference, O max represents the maximum period difference, n1 is the refractive index of the material of the microlens and the image layer, n2 is the refractive index of air, f is the focal length of the microlens, h min is the minimum depth of field, h max is the maximum depth of field, T1 is the initial period of the image and text; The period difference of each point on the three-dimensional model is calculated according to formula (7): O x = O max -(O max - O min ) × (D min - D x ) / (D max - D min ) Formula (7); Among them, O x represents the period difference of each point on the three-dimensional model, D x Denotes the depth of field of each point on the stereo model, D max Denotes the maximum depth of field, D min represents the minimum depth of field, O max represents the maximum period difference, O max represents the minimum period difference.

9. The method for producing a discrete magnified image of a microlens array according to claim 8, characterized in that: Determining the period of each point of the three-dimensional model according to the period difference includes: The period of each point on the three-dimensional model is calculated according to formula (8): T x =T1-O x Formula (8); Among them, T x represents the period of each point on the three-dimensional model, O x represents the period difference of each point on the three-dimensional model, and T1 represents the initial period of the image.

10. The method for producing a discrete magnified image of a microlens array according to claim 1, characterized in that: The reference pattern of the graphics is produced, and the target pattern of each graphics is obtained according to the target period of each graphics and the reference pattern, including The size of the reference pattern is smaller than the initial period of the pattern According to the target period of each of the images and texts, the magnification ratio of each of the images and texts is obtained; The magnification M of each of the images is calculated according to formula (9): Wherein, r represents the ratio of the target period of each of the images to the period of the microlenses; α represents the value of the rotation angle between the array of the microlenses and the array of the images; According to the magnification ratio and the reference pattern, a target pattern of each of the graphics is obtained.

11. An optical imaging film, characterized in that: It comprises a lens layer (100), a spacer layer (200) and a graphic layer (300), The lens layer (100) comprises a plurality of micro lenses (110), and the plurality of micro lenses (110) are arranged in an array; The image layer (300) comprises a plurality of images, and the image layer (300) is prepared according to the method for producing a discrete magnified image of a microlens array according to any one of claims 1 to 10. The lens layer (100) and the image layer (300) are respectively arranged on two opposite sides of the spacing layer (200), and the distance between the image layer (300) and the lens layer (100) meets the focal length range of the microlens (110).

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