KR20190092645A - Stereoscopic film sheet and transfer material - Google Patents

Stereoscopic film sheet and transfer material Download PDF

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Publication number
KR20190092645A
KR20190092645A KR1020180010673A KR20180010673A KR20190092645A KR 20190092645 A KR20190092645 A KR 20190092645A KR 1020180010673 A KR1020180010673 A KR 1020180010673A KR 20180010673 A KR20180010673 A KR 20180010673A KR 20190092645 A KR20190092645 A KR 20190092645A
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KR
South Korea
Prior art keywords
layer
focal length
film sheet
lens
resin
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Application number
KR1020180010673A
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Korean (ko)
Inventor
김진호
배수연
성태현
김현철
Original Assignee
주식회사 상보
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Priority to KR1020180010673A priority Critical patent/KR20190092645A/en
Publication of KR20190092645A publication Critical patent/KR20190092645A/en

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    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B3/00Simple or compound lenses
    • G02B3/0006Arrays
    • G02B3/0037Arrays characterized by the distribution or form of lenses
    • G02B3/005Arrays characterized by the distribution or form of lenses arranged along a single direction only, e.g. lenticular sheets
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B44DECORATIVE ARTS
    • B44CPRODUCING DECORATIVE EFFECTS; MOSAICS; TARSIA WORK; PAPERHANGING
    • B44C1/00Processes, not specifically provided for elsewhere, for producing decorative surface effects
    • B44C1/16Processes, not specifically provided for elsewhere, for producing decorative surface effects for applying transfer pictures or the like
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B1/00Optical elements characterised by the material of which they are made
    • G02B1/04Optical elements characterised by the material of which they are made made of organic materials, e.g. plastics
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B3/00Simple or compound lenses
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B3/00Simple or compound lenses
    • G02B3/0006Arrays
    • G02B3/0037Arrays characterized by the distribution or form of lenses
    • G02B3/0043Inhomogeneous or irregular arrays, e.g. varying shape, size, height
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B3/00Simple or compound lenses
    • G02B3/10Bifocal lenses; Multifocal lenses
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B5/00Optical elements other than lenses
    • G02B5/20Filters

Abstract

A film sheet including a lens layer in which a plurality of semi-circular convex lenses are arranged in such a manner as to exhibit a binocular parallax effect, two or more focal length layers provided below the lens layer, and an image forming layer provided below the focal length layer; It provides a transfer material comprising the film sheet.

Description

Film Sheets & Transfer Materials {STEREOSCOPIC FILM SHEET AND TRANSFER MATERIAL}

The present invention relates to a stereoscopic expression film sheet using a lenticular and a transfer material comprising the film sheet.

With the recent development of mobile devices, counterfeit goods have soared. It's so sophisticated that it's hard to tell even a professional, and the damage to consumers who know it and buy it is substantial. The problem is that it is difficult to distinguish between genuine and counterfeit goods. In order to solve these problems, the company has been trying to develop technology at the enterprise level. However, due to problems such as the cost of researching and applying security technology and the equipment necessary to check for counterfeit, the results are not getting effective results. Therefore, it is urgent to develop new security technology to cope with the increasing number of counterfeit goods.

In order to solve this problem, various authenticity determination methods have been developed. One of the methods for authenticity determination is to attach a label that cannot be easily forged by others through gold foil pressure or laser engraving. However, due to the development of printing technology or gold foil technology, even the label can be easily reproduced, thus failing to achieve its purpose.

Accordingly, a new method of film production, such as a label through a print process that causes a color change by heat, has been developed. In addition, a technology has been developed such that a trademark is displayed only when the film is viewed from a certain angle by constructing a film using a hidden image that is not expressed in a general state but changes when a specific state is made. . Hidden images can be printed on transparent or translucent substrates in a form that makes it difficult to identify specific information by saturation and brightness, and then identify hidden information by illuminating the substrate with a light on the monitor (change of specific state). There is a way to do it. That is, in the conventional hidden image expression, a method of causing visual illusion by changing the brightness and saturation of the background and the image painted with dyes or pigments, or by making the background or image composed of fine and complex patterns or symbols.

As described above, a film produced by printing using a dye or a pigment is merely a two-dimensional image representation, and there is a problem of discoloration due to ultraviolet rays of a dye or a pigment.

Accordingly, a three-dimensional lens sheet capable of reconstructing a planar 2D image into a three-dimensional image by using a principle of optical illusion caused by binocular disparity using a lenticular or microlens has been illuminated. In the conventional three-dimensional image display method through a three-dimensional lens sheet, by combining a lenticular lens or a microlens on the image represented by the dye or pigment to take advantage of the three-dimensional and various transformation effects of the image. In other words, the most important factor to feel the three-dimensional feeling is to use the binocular disparity that appears because the human eye is located about 65mm in the horizontal direction, using a three-dimensional lens, the blocking effect of some images and the selective light forward By using the effect, the effect of the three-dimensional stereoscopic image can be obtained from the two-dimensional plane image.

One embodiment relates to a film sheet composed of a plurality of focal length layers together with a lens layer and an image forming layer, and through the plurality of focal length layers, three-dimensional stereoscopic control and various colors of images can be provided. It is not possible and can carry out various designs and functions.

Another embodiment relates to a transfer material including the film sheet.

An embodiment includes a lens layer in which a plurality of semi-circular convex lenses are arranged in a manner that may exhibit a binocular parallax effect, two or more focal length layers provided below the lens layer, and an image forming layer provided below the focal distance layer. It provides a film sheet.

The film sheet may include a lens layer having a plurality of semi-circular convex lenses arranged in a manner that may exhibit a binocular parallax effect, a first focal length layer provided below the lens layer, and a second provided below the first focal length layer. And a focal length layer, a third focal length layer provided below the second focal length layer, and an image forming layer provided below the third focal length layer.

The two or more focal length layers may each independently include a pigment, a dye, a bead, or a combination thereof.

The two or more focal length layers are each independently polyethylene terephthalate (PET, polyethylene terephthalate), polycarbonate (PC, Polycarbonate), UV resin (UV Resin), epoxy resin (Epoxy Resin), acrylic resin (Acryl Resin) or Combinations thereof may be further included.

The two or more focal length layers may each independently have a thickness of 1 μm to 250 μm.

The convex lens may be formed of a lenticular pattern or a dot pattern.

The plurality of semi-circular convex lenses may have a continuous or discontinuous pattern.

The refractive index of the lens layer may satisfy the condition of Equation 1 below.

[Equation 1]

Δn = (n 1 -n 2 )> 0.05

In Equation 1, n 1 represents the refractive index of the lens layer, and n 2 represents the refractive index of any one of two or more focal length layers.

The image forming layer forms an image as a set of a plurality of structures to hide or appear the image according to the viewing angle or the viewing focal length of the film sheet, the height of the structure may be smaller than the pitch distance between the structures.

The structure is composed of polyethylene terephthalate (PET), polycarbonate (PC, Polycarbonate), UV resin (UV Resin), epoxy resin (Epoxy Resin), acrylic resin (Acryl Resin) or a combination thereof, It can represent a hidden image.

The structure may have a height of several micrometers to several tens of micrometers.

The lens layer may include a first lenticular lens having the plurality of semi-circular convex lenses arranged in parallel, and a second lenticular lens having the plurality of semi-circular convex lenses in a shape in which the first lenticular lens and the curved surface face each other. The bus bars of the plurality of semi-circular convex lenses arranged in the first lenticular lens and the second lenticular lens may be alternately formed.

The light shielding layer may be further provided below the image forming layer.

Another embodiment provides a transfer material including the film sheet.

The transfer material may further include an adhesive layer formed under the image forming layer or the light shielding layer of the film sheet and a release film formed on the red layer of the film sheet.

Other details of aspects of the invention are included in the following detailed description.

The film sheet according to the embodiment includes a multi-layer structure including a plurality of focal length layers, in particular, a second focal length layer, so that duplication is impossible and various designs and functions can be performed.

1 is a view showing a film sheet configuration according to an embodiment of the present invention.
2 is a view showing the configuration of a lens layer in a film sheet according to another embodiment of the present invention.

Preferred embodiments of the present invention will be described in detail. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided so that the disclosure may be made thorough and complete, and to fully convey the spirit of the present invention to those skilled in the art.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. However, in describing the preferred embodiment of the present invention in detail, if it is determined that the detailed description of the related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. In addition, the same or similar reference numerals are used throughout the drawings for parts having similar functions and functions.

In addition, throughout the specification, when a part is 'connected' to another part, it is not only 'directly connected' but also 'indirectly connected' with another element in between. Include. In addition, the term 'comprising' of an element means that the element may further include other elements, not to exclude other elements unless specifically stated otherwise.

An embodiment of the present invention relates to a film sheet representing a stereoscopic image, wherein the film sheet includes a lens layer in which a plurality of semi-circular convex lenses are arranged in a manner that may exhibit a binocular parallax effect, and two or more focal points provided under the lens layer. And a distance forming layer and an image forming layer disposed below the focal length layer. For example, the film sheet may include a lens layer in which a plurality of semi-circular convex lenses are arranged in a manner that may exhibit a binocular parallax effect, a first focal length layer provided under the lens layer, and a lower portion provided under the first focal length layer. And a second focal length layer, a third focal length layer provided below the second focal length layer, and an image forming layer provided below the third focal length layer.

The film sheet may include a plurality of focal length layers, that is, first to third focal length layers, and thus may not be easily replicated, thereby implementing various designs and functions.

Furthermore, in the film sheet according to the embodiment, since the lens layer and the image forming layer are separated from each other through a plurality of focal length layers (the lens layer and the image forming layer are not adjacent to each other), the lens layer is first produced in large quantities. In addition, various image forming layers may be separately matched to each other to produce a bar, and thus yields may be greatly improved even in the production of small quantities of various products.

Specifically, the two or more focal length layers, such as the first to third focal length layers, may each independently include a pigment, a dye, a bead, or a combination thereof. More specifically, the second focal length layer may include a pigment, a dye, a bead, or a combination thereof. The first to third focal length layers are each independently, more specifically, the second focal length layer includes colorants such as pigments and / or dyes, and at the same time positioned between a plurality of focal length layers, i.e., a first focal length layer. By being located between the distance layer and the third focal length layer, a variety of colors may be realized than conventional products including a single focal length layer.

1 is a view showing a film sheet according to an embodiment. As shown in FIG. 1, when a two-dimensional image is positioned below a lens layer including a plurality of semi-circular convex lenses, light refraction occurs due to the bending of the lens constituting the lens layer, and binocular disparity is obtained. By using the optical illusion effect principle by) will be recognized as a three-dimensional image.

At this time, the two-dimensional image is painted with a dye or a pigment, and conventionally, the lens layer in the film sheet is formed of a single focal length layer even if it is adjacent to or not adjacent to the image forming layer, so that the dye or pigment is easily discolored by ultraviolet rays or the like. As a result, it was difficult to realize a stereoscopic image.

However, the film sheet according to the embodiment includes a plurality of focal length layers between the lens layer and the image forming layer, specifically, “lens layer / first ultra-short layer / second focal length layer / third focal length layer / image. The lens layer is not directly in contact with the image forming layer, so that discoloration due to ultraviolet rays of dyes or pigments used for coloring the image in the image forming layer can be prevented. Furthermore, each of the first to third focal length layers may independently include a pigment, a dye, a bead, or a combination thereof (more specifically, the second focal length layer may include a colorant such as a pigment and a dye). This can prevent the discoloration of the image in the image forming layer and at the same time can implement a variety of colors of the image.

For example, the first to third focal length layers may each independently include a curable resin together with the pigment, dye, and / or beads. The curable resin may be polyethylene terephthalate (PET), polycarbonate (PC, Polycarbonate), UV resin (UV Resin), epoxy resin (Epoxy Resin), acrylic resin (Acryl Resin), or a combination thereof. However, the present invention is not limited thereto.

The first to third focal length layers may be provided below the lens layer to adjust a focal length corresponding to a radius of curvature. That is, a focal length layer having an appropriate thickness may be formed according to the curvature, thickness, size of the image, and size and position of the hidden image.

For example, each of the first to third focal length layers may independently have a thickness of 1 μm to 250 μm, and may have a refractive index of 1.4 to 1.7, for example, 1.45 to 1.60.

The thicknesses and refractive indices of the first to third focal length layers are preferably within the above ranges in view of preventing image distortion and adjusting stereoscopic effects. For example, when each of the thicknesses of the first to third focal length layers is independently less than 1 μm, the thickness may be too thin to have a three-dimensional effect, and may not function as a focal length layer, and the first to third focal lengths may be used. When the layer thicknesses are each independently greater than 250 μm, the thickness may be so thick that image distortion may be severe.

Each of the first to third focal length layers may be independently coated on a surface of the first to third focal length layers through corona treatment or plasma treatment. In this case, fairness can be further improved. When each of the first to third focal length layers is independently coated, it is possible to help maintain the refractive index characteristics of the lens layer, to effectively implement a three-dimensional effect, and further to improve the interface adhesion between the lens layer and the first focal length layer. It can improve and provide the outstanding durability. In the pre-coating, the coating layer may have a dyne level of 40 dynes / cm 2 or more, such as 45 dynes / cm 2 or more. When the dyne level of the coating layer is less than 40 dynes / cm 2 , the durability of the film sheet may be lowered. The upper limit of the dyne level of the coating layer is not particularly limited, and may be adjusted within a range of, for example, about 60 dynes / cm 2 or less in consideration of a three-dimensional effect of the film sheet.

For example, the film sheet according to an embodiment may further include a UV cured layer between the first and second focal length layers and between the second and third focal length layers. The UV cured layer may serve as an adhesive layer for bonding the focal length layer, and may be formed of an ultraviolet curable resin cured through UV irradiation. The UV cured layer may have an appropriate refractive index difference with the lens layer to adjust the angle of refraction of light incident from the lens layer. For example, the UV cured layer may be formed of acrylic resin, polycarbonate resin, MS resin (methyl methacrylate, styrene copolymer resin), polystyrene, polyethylene (PET), etc., but is not limited thereto.

The convex lens constituting the lens layer may be formed of a lenticular pattern formed in a predetermined direction in the lens layer plane or a dot pattern having a predetermined pattern angle in a dot shape. For example, the convex lens may be formed in a lenticular pattern.

The plurality of convex lenses constituting the lens layer may also have a continuous or discontinuous pattern. For example, the convex lens may have a discontinuous pattern. The convex lens having a discontinuous pattern is more effective to realize a three-dimensional effect than when the convex lens has a continuous pattern.

The lens layer may include a lenticular lens in which a plurality of semi-circular convex lenses are arranged in parallel, or a micro lens in which a plurality of semi-circular convex lenses are continuously arranged. The convex lens is formed with a refractive index that satisfies the condition of Equation 1 below, and the cross section may be formed as an aspherical surface. According to one embodiment, the convex lens constituting the lens layer may be configured as an aspherical surface having an extremely high angle of view, unlike the general three-dimensional lens layer. By adopting such a configuration, when the surface of the film sheet is coated with a flat coating layer having a low refractive index, it is possible to solve the problem of having a double refractive index and a narrowing angle of view. In addition, by configuring aspherical surface, the focal length can be adjusted.

[Equation 1]

Δn = (n 1 -n 2 )> 0.05

In Equation 1, n 1 represents the refractive index of the lens layer, n 2 represents the refractive index of any one of the first to third focal length layer.

In one embodiment, when Δn is less than or equal to 0.05, the focal length of the lens layer is not sufficiently short, and thus the viewing distance becomes excessively long, thereby causing a stereoscopic image to be distorted or not clearly observed. The upper limit is not particularly limited, but considering the three-dimensional effect, for example, Δn can be adjusted in the range of 1.64 or less.

As described above, the lens layer is configured to obtain a three-dimensional image effect by using binocular parallax, and bending occurs on the surface of the lenticular lens or the microlens. Therefore, the surface of the lens tends to be contaminated, and friction occurs only on the convex parts, and the degree of wear varies according to the parts of the lens, and the curvature that is different from the original curvature is formed. It also happens. Therefore, by further configuring a flat coating layer on the top surface to form a curved surface in the lens layer, it is possible to solve the problem of narrowing the angle of view as described above. The planar coating layer is composed of a transparent resin having a refractive index different from the refractive index of the lens layer, so that the surface is formed flat while maintaining the refractive phenomenon due to the bending of the lens layer.

Instead of the planar coating layer, the lens layer may be configured of the first lenticular lens and the second lenticular lens, and the busbars of the first and second lenticular lenses may be alternated with each other to form a flat upper surface of the lens.

Specifically, as shown in FIG. 2, the lens layer includes a plurality of semi-circular convex shapes in which the plurality of semi-circular convex lenses are arranged in parallel and the first lenticular lens and the first lenticular lens face each other. A second lenticular lens having a lens is provided, and the bus bars of the plurality of semi-circular convex lenses arranged in the first lenticular lens and the second lenticular lens may be alternately formed.

When the lens layer is configured as illustrated in FIG. 2, by forming the mother buses of the two lenticular lenses having curved surfaces facing each other, they may have a three-dimensional effect in various directions. That is, the lens upper surface can be formed flat without providing a separate flat coating layer, and the effect of the microlens is also obtained. The angle between the busbars may be preferably staggered to each other at 45 °, 60 ° or 90 °, but is not necessarily limited thereto.

The image forming layer, which is provided below the third focal length layer, may form an image as a set of a plurality of structures protruding at intervals and heights of several μm to several tens of μm. If a certain image is to be represented, the image may be formed of a plurality of structures. The structure is provided with a predetermined pitch distance (interval), and may be formed at a predetermined height, and the interval and height may be determined according to a pattern or a color display standard according to the light reflection wavelength. According to the principle that light is refracted or reflected by the structure constituting the image forming layer and recognized as a specific color by the reflected light, the image is hidden depending on the angle of view or the focal length of the film sheet viewed from the top of the lens layer. May appear.

For example, the height of the structure may be formed smaller than the pitch distance between the structures, the specific height or pitch distance is not limited to a specific value, the structure having a variety of micro unit size, for example, a structure having a height of several micrometers to several tens of micrometers is formed Image can be represented according to the wavelength of light reflection.

The (micro) structure may include polyethylene terephthalate (PET), polycarbonate (PC, Polycarbonate), ultraviolet resin (UV Resin), epoxy resin, acrylic resin, or a combination thereof. Can be configured to represent a hidden image.

In addition, according to another embodiment of the present invention, it may be configured to further include a light shielding layer provided under the image forming layer. Since the present invention is to form an image through the color appearing as the light is reflected from the structure, by configuring to further include a light shielding layer at the bottom, it is possible to use the effective light reflection effect.

On the other hand, another embodiment of the present invention provides a transfer material comprising the film sheet described above.

For example, the transfer material may include a release film formed on the film sheet, the adhesive layer formed on the lower portion of the film sheet and the lens layer of the film sheet.

The adhesive layer may be formed under the image forming layer or the light shielding layer of the film sheet, and may serve to fix the film sheet to the molded article. According to the embodiment, it can form using various well-known thermosensitive or pressure-sensitive resin, For example, polyacrylic resin, polystyrene resin, polyamide type, chlorinated polyolefin resin, chlorinated ethylene-vinyl acetate copolymer resin Or it may be formed using a rubber resin or the like, but is not necessarily limited thereto.

The release film is to be peeled off after adhesion to the molded article, it may be formed on the top of the film sheet. According to the embodiment, a resin film mainly composed of polypropylene resin, polyethylene resin, polyamide resin, polyester resin, polyacrylic resin or polyvinyl chloride resin, and metal foil such as aluminum foil or copper foil , A release film may be formed by forming a release layer by forming a release layer by performing a release treatment on one surface of the base, such as a cellulose sheet such as glycine paper, coated paper or cellophane or a composite sheet of two or more of the above. . In this case, the release treatment method for forming the release layer is not particularly limited, and for example, epoxy, epoxy-melamine, amino alkyd, acrylic, melamine, silicone, fluorine, cellulose, urea resin, polyolefin, It can be formed using various printing methods or coating methods using a paraffin-based or two or more of the above composite release agent.

The film sheet according to the embodiment may further comprise an adhesive layer and a release film as described above, and may be used in such a manner as to transfer it to the surface of a desired molded article.

In the transfer method of the transfer material including the film sheet to the molded article according to one embodiment, the adhesive layer of the transfer material is disposed to contact the surface of the molded article, the temperature is about 80 ℃ to 260 ℃, pressure 50kg / ㎡ to 200kg / ㎡ Under the conditions, if heat and pressure are applied to the release film side with a transfer member such as a heat-resistant rubber-like elastomer, then the release film is peeled off after the cooling process, peeling occurs at the interface between the film sheet and the release film, and the film sheet is transferred to the surface of the molded article. Can be. However, this is only an example, and in addition, the film sheet may be transferred to the molded article by various methods such as a mold injection method.

The material of the molded article is not particularly limited. For example, the molded article may be a resin molded article, a woodworking product, a metal product, a composite product of two or more of the above, or any kind of molded article requiring hard coating. As resin of a resin molded article, general-purpose resin, such as polystyrene resin, polyolefin resin, ABS resin, AS resin, or AN resin, is mentioned above. Moreover, polyphenylene oxide polystyrene resin, polycarbonate resin, polyacetal resin, acrylic resin, polycarbonate modified polyphenylene ether resin, polyethylene terephthalate resin, polybutylene terephthalate resin, ultra high molecular weight polyethylene resin, etc. Of general-purpose engineering resins, polysulfone resins, polyphenylene sulfide resins, polyphenylene oxide resins, polyacrylate resins, polyetherimide resins, polyimide resins, liquid crystal polyester resins, and polyaryl heat-resistant resins. Engineering resins can also be used. Furthermore, in this invention, the composite resin which added reinforcing materials, such as glass fiber and an inorganic filler, can also be used.

Film according to one embodiment can be used in a variety of applications, such as most of the exterior used in portable electronic devices, such as a keypad of a mobile phone. Furthermore, the film according to the embodiment is useful for a variety of products that require three-dimensional representation of business cards, credit cards, decorative materials, keypads, packaging materials, switches, sidewalk blocks, coasters, billboards, interior accessories, wallpaper, photos, cards, etc. Can be utilized.

The present invention is not limited to the above embodiments, but may be manufactured in various forms, and a person skilled in the art to which the present invention pertains has another specific form without changing the technical spirit or essential features of the present invention. It will be appreciated that the present invention may be practiced as. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive.

1: lens layer (first lenticular lens)
2: image forming layer
3: first focal length layer
4: second focal length layer
5: third focal length layer
6: lens layer (second lenticular lens)

Claims (15)

  1. A film sheet comprising a lens layer in which a plurality of semi-circular convex lenses are arranged in a manner that can exhibit a binocular parallax effect, two or more focal length layers provided under the lens layer, and an image forming layer provided under the focal length layer.
  2. In claim 1,
    The film sheet may include a lens layer having a plurality of semi-circular convex lenses arranged in a manner that may exhibit a binocular parallax effect, a first focal length layer provided below the lens layer, and a second provided below the first focal length layer. A film sheet comprising a focal length layer, a third focal length layer provided below the second focal length layer, and an image forming layer provided below the third focal length layer.
  3. In claim 1,
    The two or more focal length layers each independently comprise a pigment, dye, bead (bead) or a combination thereof.
  4. In claim 3,
    The two or more focal length layers are each independently polyethylene terephthalate (PET, polyethylene terephthalate), polycarbonate (PC, Polycarbonate), UV resin (UV Resin), epoxy resin (Epoxy Resin), acrylic resin (Acryl Resin) or Film sheet further comprising a combination of these.
  5. In claim 1,
    The two or more focal length layers each independently have a thickness of 1 μm to 250 μm.
  6. In claim 1,
    The convex lens is a film sheet formed of a lenticular pattern or a dot pattern.
  7. In claim 1,
    The plurality of semi-circular convex lens is a film sheet having a continuous or discontinuous pattern.
  8. In claim 1,
    The refractive index of the lens layer is a film sheet satisfying the conditions of the following equation (1).
    [Equation 1]
    Δn = (n 1 -n 2 )> 0.05
    In Equation 1, n 1 represents the refractive index of the lens layer, and n 2 represents the refractive index of any one of two or more focal length layers.
  9. In claim 1,
    The image forming layer forms an image as a set of a plurality of structures, the image is hidden or appear depending on the viewing angle or the viewing focal length of the film sheet, the height of the structure is smaller than the pitch distance between the structure film sheet.
  10. In claim 9,
    The structure is composed of polyethylene terephthalate (PET), polycarbonate (PC, Polycarbonate), UV resin (UV Resin), epoxy resin (Epoxy Resin), acrylic resin (Acryl Resin) or a combination thereof, Film sheets representing hidden images.
  11. In claim 9,
    The structure is a film sheet having a height of several ㎛ to several tens of ㎛.
  12. In claim 1,
    The lens layer may include a first lenticular lens having the plurality of semi-circular convex lenses arranged in parallel, and a second lenticular lens having the plurality of semi-circular convex lenses in a shape in which the first lenticular lens and the curved surface face each other. ,
    The busbars of the plurality of semi-circular convex lenses arranged in the first lenticular lens and the second lenticular lens are alternately formed.
  13. In claim 1,
    The film sheet further comprises a light shielding layer provided under the image forming layer.
  14. A transfer material comprising the film sheet according to any one of claims 1 to 13.
  15. The method of claim 14,
    The transfer material further comprises an adhesive layer formed under the image forming layer or the light shielding layer of the film sheet and a release film formed on the red layer of the film sheet.
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KR101042501B1 (en) * 2010-11-17 2011-06-17 이주현 A lens array sheet with a light transmission control filter
KR101341072B1 (en) * 2013-09-04 2013-12-19 안재광 Label for identifying genuine article comprising multiple nano structure and stereoscopic lens
KR20160125706A (en) * 2015-04-22 2016-11-01 김종현 Lens sheet having miniature type image pattern and method for manufacture the same

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