KR102090967B1 - Stereoscopic film sheet and transfer material - Google Patents

Abstract

A film sheet including a lens layer in which a plurality of semi-circular convex lenses are arranged in a manner capable of exhibiting 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, and It provides a transfer material comprising the film sheet.

Description

Film sheet and transfer material {STEREOSCOPIC FILM SHEET AND TRANSFER MATERIAL}

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

With the recent development of mobile devices, counterfeit products are rapidly increasing. Since it is manufactured to be sophisticated enough to discriminate even experts, the damage of consumers who know and buy as genuine products has reached a considerable level. The problem is that it is difficult to distinguish counterfeit products from genuine products. In the meantime, efforts have been made to develop technologies at the corporate level to solve these problems, but it is not possible to obtain effective results due to problems such as cost for research and application of security technologies and equipment required to check for forgery. Accordingly, it is urgent to develop a new security technology to cope with the increasing number of counterfeit products.

Various authenticity discrimination methods have been developed to solve this problem. As one of the methods for discrimination of authenticity, a label that other people cannot forge and produce easily is attached through gold foil or laser engraving. However, due to the development of printing technology or gold foil technology, even the corresponding label can be reproduced without difficulty, and thus, the purpose has not been sufficiently achieved.

Accordingly, new types of film manufacturing technologies such as labels through print processing that cause color changes by heat are being developed. In addition, a technology has been developed to configure a film by using a hidden image that is not expressed in a general state but is displayed when a specific state is changed, so that the corresponding trademark or the like is displayed only when the film is viewed from a specific angle. . As a method of expressing hidden images, it is difficult to identify specific information by saturation and lightness, and after printing on a transparent or translucent substrate, the substrate is illuminated by the light of the monitor (change in a specific state) to identify hidden information. There is a way to do it. That is, the conventional hidden image expression used a method of causing visual illusion by changing the brightness or saturation of the background and the image painted with a dye or pigment, or by making the background or image composed of fine and complicated patterns or symbols.

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

Accordingly, a three-dimensional lens sheet that can reconstruct a planar 2D image into a three-dimensional image using a lenticular or micro lens using an optical illusion principle by binocular parallax is illuminated. In the conventional method for expressing a stereoscopic image through a stereoscopic lens sheet, a lenticular lens or a microlens is combined on an image represented by a dye or pigment to use a stereoscopic effect and various conversion effects of the corresponding image. In other words, the most important factor to feel the stereoscopic effect is to use a binocular disparity that occurs because the human eye is about 65 mm apart in the horizontal direction. When a stereoscopic lens is used, blocking effect of some images and selective light advancement By using the effect, it is possible to obtain the effect of a 3D stereoscopic image as a 2D 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 it is possible to provide stereoscopic control of a three-dimensional shape and images of various colors through a plurality of focal length layers, so Impossible, and can perform various designs and functions.

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

One embodiment includes a lens layer in which a plurality of semi-circular convex lenses are arranged in a manner capable of exhibiting 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. To provide a film sheet.

The film sheet is a lens layer in which a plurality of semi-circular convex lenses are arranged in a manner capable of exhibiting a binocular parallax effect, a first focal length layer provided under the lens layer, and a second provided under the first focal length layer It may include a focal length layer, a third focal length layer provided under the second focal length layer, and an image forming layer provided under the third focal length layer.

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

The two or more focal length layers are each independently polyethylene terephthalate (PET), polycarbonate (PC), ultraviolet resin (UV Resin), epoxy resin (Epoxy Resin), acrylic resin (Acryl Resin) or Combinations of these 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 in 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 the focal length layers of 2 or more.

The image forming layer forms an image as a collection of a plurality of structures, and the image is hidden or displayed depending on an angle or viewing focal length of the film sheet, and 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), ultraviolet resin (UV Resin), epoxy resin (Epoxy Resin), acrylic resin (Acryl Resin), or a combination thereof, It can reveal hidden images.

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

The lens layer includes a first lenticular lens in which the plurality of semi-circular convex lenses are arranged in parallel, and a second lenticular lens provided with a plurality of semi-circular convex lenses in a form in which the first lenticular lens and the curved surface face each other. , The mother buses of the plurality of semi-circular convex lenses arranged in the first lenticular lens and the second lenticular lens may be formed to be staggered.

A light blocking layer provided under the image forming layer may be further included.

Another embodiment provides a transfer material comprising the film sheet.

The transfer material may further include an adhesive layer formed under the image forming layer or 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 present invention are included in the detailed description below.

The film sheet according to one embodiment includes a multi-layered structure including a plurality of focal length layers, particularly a second focal length layer, so that replication 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.

It will be described in detail preferred embodiments of the present invention. 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 to ensure that the disclosed contents are thorough and complete and that the spirit of the present invention is sufficiently conveyed to those skilled in the art.

Hereinafter, preferred embodiments will be described in detail with reference to the accompanying drawings so that those skilled in the art to which the present invention pertains can easily implement the present invention. However, in the detailed description of a preferred embodiment of the present invention, when it is determined that a detailed description of related known functions or configurations may unnecessarily obscure the subject matter of the present invention, the detailed description 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, in the entire specification, when a part is said to be 'connected' with another part, it is not only 'directly connected', but also 'indirectly connected' with another element in between. Includes. In addition, "including" a component means that other components may be further included instead of excluding other components, unless otherwise stated.

One embodiment is for a film sheet representing a stereoscopic image, wherein the film sheet is a lens layer in which a plurality of semi-circular convex lenses are arranged in a manner capable of exhibiting a binocular parallax effect, and two or more focal points provided under the lens layer It includes a distance layer and an image forming layer provided under 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 capable of exhibiting a binocular parallax effect, a first focal length layer provided under the lens layer, and a agent provided under the first focal length layer. 2, a focal length layer, a third focal length layer provided under the second focal length layer, and an image forming layer provided under the third focal length layer.

The film sheet includes a plurality of focal length layers, that is, the first to third focal length layers, and it is impossible to reproduce itself, and thus not only has excellent security, but also can implement various designs and functions.

Furthermore, in the film sheet according to the embodiment, 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), and then the lens layer is first produced in large quantities. , Here, various image forming layers can be matched separately to produce, and the yield can be greatly improved even in the production of small quantities of multiple products.

Specifically, the two or more focal length layers, such as the first to third focal length layers, may each independently include pigments, dyes, beads, or combinations thereof. More specifically, the second focal length layer may include pigments, dyes, beads, or a combination thereof. The first to third focal length layers are each independently, more specifically, the second focal length layer includes a colorant such as a pigment and / or dye, and is simultaneously positioned between a plurality of focal length layers, that is, the first focal length layer. By being positioned between the distance layer and the third focal length layer, various colors may be realized than the conventional product including a single focal length layer.

1 is a view showing a film sheet according to an embodiment. As illustrated in FIG. 1, when a 2D image is positioned under a lens layer composed of a plurality of semi-circular convex lenses, refraction of light is generated by bending of a lens constituting the lens layer, and binocular disparity ), It is recognized as a three-dimensional image by the optical illusion effect principle.

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

However, the film sheet according to one embodiment includes a plurality of focal length layers between the lens layer and the image forming layer, specifically, “Lens layer / first hyperfocal layer / second focal length layer / third focal length layer / image Since the lens layer does not directly contact the image forming layer, discoloration due to ultraviolet rays of dyes or pigments used to paint the image in the image forming layer can be prevented. Furthermore, the first to third focal length layers may each independently further include a pigment, dye, bead, or a combination thereof (more specifically, the second focal length layer may include a colorant such as a pigment or dye). It may include), thereby preventing discoloration of the image in the image forming layer and at the same time, it is possible to implement various colors of the image.

For example, each of the first to third focal length layers may further include a curable resin independently of the pigment, dye, and / or beads. The curable resin may be polyethylene terephthalate (PET), polycarbonate (PC), ultraviolet resin (UV Resin), epoxy resin (Epoxy Resin), acrylic resin (Acryl Resin) or a combination thereof, , It is not necessarily limited to this.

The first to third focal length layers may be provided below the lens layer to match the focal length corresponding to the 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 expressed in the lens layer.

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

It is preferable in terms of preventing image distortion and controlling stereoscopic effects that the thicknesses and refractive indices of the first to third focal length layers do not deviate from the above ranges. For example, when the thicknesses of the first to third focal length layers are each independently less than 1 μm, the thickness is too thin to have a three-dimensional effect and cannot function as a focal length layer, and the first to third focal length layers When the thickness of each layer is independently greater than 250 μm, the thickness of the layer may be too thick, resulting in severe image distortion.

Each of the first to third focal length layers may be independently pre-coated on the surface 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 pre-coated, it helps to maintain the refractive index characteristics of the lens layer, so that a three-dimensional effect can be effectively implemented, and further improves the interface adhesion between the lens layer and the first focal length layer. By improving, it is possible to impart excellent durability. When the pre-coating, the coating layer may have a dyne level of 40 dynes / cm ² or more, for example, 45 dynes / cm ^{2 or} more. When the dyne level of the coating layer is less than 40 dynes / cm ² , there is a fear that durability of the film sheet is deteriorated. The upper limit of the dyne level of the coating layer is not particularly limited, and may be adjusted within a range of about 60 dynes / cm ² or less, for example, in consideration of the effect of realizing the 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 that is cured through UV irradiation. The UV cured layer may have an appropriate refractive index difference from the lens layer in order to adjust the refractive angle of light incident from the lens layer. For example, the UV cured layer may be formed of an acrylic resin, polycarbonate resin, MS resin (methyl methacrylate, styrene copolymerized resin), polystyrene, polyethylene (PET), but is not limited thereto.

The convex lens constituting the lens layer may be formed of a lenticular pattern formed long in a predetermined direction in the plane of the lens layer or a dot pattern formed while having a constant 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 in realizing a three-dimensional effect than 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 an embodiment, the convex lens constituting the lens layer may be configured as an aspherical surface having an extremely high angle of view, unlike a general stereoscopic lens layer. By adopting such a configuration, when coating on the surface of the film sheet with a flat coating layer having a low refractive index, it is possible to solve the problem of having a double refractive index and narrowing the angle of view. In addition, by configuring an aspherical surface, it is possible to adjust the focal length.

[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 the first to third focal length layers.

In one embodiment, when the Δn is 0.05 or less, the focal length of the lens layer is not sufficiently short, and thus the visibility distance is too long, and thus there is a possibility that the stereoscopic image may be distorted or not clearly observed. The upper limit is not particularly limited, but in consideration of the effect of realizing a three-dimensional effect, for example, Δn may be adjusted in a range of 1.64 or less.

As described above, the lens layer is a structure for obtaining a three-dimensional image effect using binocular parallax, and a curvature is generated on the surface of a lenticular lens or a microlens. Therefore, the surface of the lens is easy to be contaminated, and friction occurs only in the convex portion, so the degree of wear varies depending on the part of the lens, and the curvature is different from the original curvature. It also happens. Therefore, by further configuring a flat coating layer on the upper surface forming the curved surface in the lens layer, it is possible to solve the problem of narrowing the angle of view as described above. The flat coating layer is preferably made of a transparent resin having a refractive index of a different value 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 composed of a first lenticular lens and a second lenticular lens, and the busbars of the first and second lenticular lenses may be staggered to form a flat upper surface of the lens.

Specifically, as illustrated in FIG. 2, the lens layer may include a first lenticular lens in which the plurality of semi-circular convex lenses are arranged in parallel, and a plurality of semi-circular convex in the form where the first lenticular lens and the curved surface face each other. A second lenticular lens including 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 formed to be staggered.

When the lens layer is configured as shown in FIG. 2, the busbars of the two lenticular lenses provided in a form in which the curved surfaces face each other are staggered to form a three-dimensional effect in various directions. That is, without having a separate flat coating layer, the upper surface of the lens can be formed flat, and the effect of the microlens is also obtained. The angle between the busbars may be configured to be staggered with each other at 45 °, 60 °, or 90 °, but is not limited thereto.

The image forming layer, which is provided below the third focal length layer, may form an image with a set of a plurality of structures that protrude at intervals and heights of a few μm to several tens of μm. When an image is to be expressed, the corresponding image may be formed of a plurality of structures. The structure is provided at a predetermined pitch distance (interval), and may be formed at a predetermined height, and such an interval and height may be determined according to a pattern or color display standard according to a light reflection wavelength. On the basis of 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 viewing angle or the focal length of the film sheet 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, but the specific height or pitch distance is not limited to a specific value, and structures having various micro unit sizes, for example, structures having a height of several μm to several tens μm are formed. It is possible to express the image according to the light reflection wavelength.

The (micro) structure is polyethylene terephthalate (PET, Polyethylene terephthalate), polycarbonate (PC, Polycarbonate), UV resin (UV Resin), epoxy resin (Epoxy Resin), acrylic resin (Acryl Resin) or a combination thereof It 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 on the lower portion of the image forming layer. In the present invention, since the image is formed through a color that appears while light is reflected from the structure, an effective light reflection effect can be used by configuring the light shielding layer to be further included in the lower portion.

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

For example, the transfer material may include the film sheet, an adhesive layer formed on the lower portion of the film sheet, and a release film formed on 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. Depending on the embodiment, it can be formed using various known thermosensitive or pressure-sensitive resins, for example, polyacrylic resins, polystyrene resins, polyamide-based, chlorinated polyolefin-based resins, chlorinated ethylene-vinyl acetate copolymer resins Or it may be formed using a rubber-based resin, but is not limited thereto.

The release film, which is peeled after adhesion to the molded article, may be formed on the top of the film sheet. Depending on the embodiment, a resin film mainly made of polypropylene-based resin, polyethylene-based resin, polyamide-based resin, polyester-based resin, polyacrylic-based resin or polyvinyl chloride-based resin, and metal foil such as aluminum foil or copper foil A release film may be formed by forming a release layer by performing a release treatment on one surface of the substrate, using a cellulose-based 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, for example, epoxy-based, epoxy-melamine-based, amino-alkyd-based, acrylic-based, melamine-based, silicone-based, fluorine-based, cellulose-based, urea resin-based, polyolefin-based, It may be formed using various printing methods or a coating method using a paraffin-based or a composite release agent of two or more of the above.

The film sheet according to an embodiment may further include an adhesive layer and a release film as described above to constitute a transfer material, and may be used as a method of transferring it to the surface of a desired molded product.

As a transfer method of a transfer material including a film sheet according to one embodiment to a molded article, the adhesive layer of the transfer material is disposed to contact the surface of the molded article, and the temperature is about 80 ° C to 260 ° C, and the pressure is 50kg / m2 to 200kg / m2 Under conditions, when heat and pressure are applied to the release film side by a transfer device such as a heat-resistant rubber-like elastic body, and 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 product. Can be. However, this is limited to one embodiment, and in addition, the film sheet may be transferred to a molded product by various methods such as a mold injection method.

The material of the molded article is not particularly limited. For example, the molded product may be a resin molded product, a woodworking product, a metal product, a composite product of two or more of the above, or any other molded product requiring hard coating. As the resin of the resin molded article, general-purpose resins such as polystyrene-based resins, polyolefin-based resins, ABS resins, AS resins, or AN resins may be mentioned. In addition, polyphenylene oxide polystyrene resins, polycarbonate resins, polyacetal resins, acrylic resins, polycarbonate modified polyphenylene ether resins, polyethylene terephthalate resins, polybutylene terephthalate resins, or ultra high molecular weight polyethylene resins, 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. In addition, in the present invention, a composite resin to which a reinforcing material such as glass fiber or inorganic filler is added can also be used.

The film according to one embodiment may be used in most fields used in portable electronic devices, such as keypads of mobile phones in various fields. Furthermore, the film according to one embodiment is useful for various products that require three-dimensional expression such as 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 different forms, and those skilled in the art to which the present invention pertains may have other specific forms without changing the technical spirit or essential features of the present invention. It will be understood that can be carried out. Therefore, it should be understood that the embodiments described above are illustrative 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)

A lens layer in which a plurality of semi-circular convex lenses are arranged in a manner capable of exhibiting 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,
The at least two focal length layers include a first focal length layer provided below the lens layer, a second focal length layer provided below the first focal length layer, and a third focal length layer provided below the second focal length layer. Layer,
The second focal length layer is a film sheet comprising a pigment, dye, bead or a combination thereof.
delete delete In claim 1,
The two or more focal length layers are each independently polyethylene terephthalate (PET), polycarbonate (PC), ultraviolet resin (UV Resin), epoxy resin (Epoxy Resin), acrylic resin (Acryl Resin) or A film sheet further comprising a combination of these.
In claim 1,
The two or more focal length layers are each independently a film sheet having a thickness of 1㎛ to 250㎛.
In claim 1,
The convex lens is a film sheet formed of a lenticular pattern or a dot pattern.
In claim 1,
The plurality of semi-circular convex lenses is a film sheet having a continuous or discontinuous pattern.
In claim 1,
The refractive index of the lens layer is a film sheet that satisfies 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 the focal length layers of 2 or more.
In claim 1,
The image forming layer forms an image as a set of a plurality of structures, and the image is hidden or displayed depending on an angle or viewing focal length of the film sheet, and the height of the structure is smaller than the pitch distance between the structures.
In claim 9,
The structure is composed of polyethylene terephthalate (PET), polycarbonate (PC), ultraviolet resin (UV Resin), epoxy resin (Epoxy Resin), acrylic resin (Acryl Resin), or a combination thereof, Film sheet showing hidden images.
delete In claim 1,
The lens layer includes a first lenticular lens in which the plurality of semi-circular convex lenses are arranged in parallel, and a second lenticular lens provided with a plurality of semi-circular convex lenses in a form where the first lenticular lens and the curved surface face each other. ,
A film sheet formed by staggering the busbars of the plurality of semi-circular convex lenses arranged in the first lenticular lens and the second lenticular lens.
In claim 1,
A film sheet further comprising a light shielding layer provided under the image forming layer.
A transfer material comprising the film sheet according to any one of claims 1, 4 to 10, 12 and 13.
In claim 14,
The transfer material further comprises an adhesive layer formed under the image forming layer or light shielding layer of the film sheet and a release film formed on the red layer of the film sheet.

Images