KR102153234B1 - Three dimensional sheet label - Google Patents

Abstract

A three-dimensional sheet label includes: an optically transparent transparent substrate; a lens array arranged along a first direction on the upper surface of the transparent substrate, and including a plurality of microlenses each having a hemispherical shape of a diameter; and a pattern array which is arranged along a tilt direction having a tilt angle tilted with respect to the first direction on a lower surface of the transparent substrate and includes a plurality of printed patterns each having a size smaller than the diameter, so that a three-dimensional pattern can be implemented by using a moire phenomenon. Accordingly, the three-dimensional pattern of various sizes or shapes can be implemented.

Description

Three-dimensional sheet label {THREE DIMENSIONAL SHEET LABEL}

The present invention relates to a three-dimensional sheet label. In more detail, the present invention relates to a three-dimensional sheet label capable of displaying a three-dimensional pattern using a microlens and a printing pattern.

The three-dimensional sheet label implements a specific shape by enlarging the shape of a printed pattern using micro lenses. The three-dimensional sheet label includes a transparent substrate and a lens array and a pattern array each formed on an upper surface and a lower surface of the transparent substrate.

The lens array includes hemispherical micro lenses. The microlenses have a diameter of several micrometers to 20 micrometers in size, and are arranged in a specific direction at a constant pitch. Meanwhile, the pattern array includes printed patterns arranged to correspond to the micro lenses.

At this time, each of the printed patterns having a size smaller than the diameter of the microlens must match each of the microlenses. However, it is difficult to accurately align the microlenses and printed patterns because they are small. In particular, if the alignment is not accurately performed, the shape or size of the three-dimensional pattern to be implemented may be changed.

In addition, when the size of the three-dimensional pattern needs to be changed, the cost of a mold for manufacturing the lens array or print pattern also increases.

Accordingly, one object of the present invention is to provide a three-dimensional sheet label capable of implementing a three-dimensional pattern with a new principle.

In order to achieve the above object, the three-dimensional sheet label according to an embodiment of the present invention includes an optically transparent transparent substrate, a plurality of optically transparent substrates arranged along a first direction on an upper surface of the transparent substrate, and each having a hemispherical shape of a diameter. By including a lens array including microlenses of and a plurality of printing patterns each having a size smaller than the diameter arranged along a tilt direction having a tilt angle tilted with respect to the first direction on a lower surface of the transparent substrate It includes a pattern array provided to implement a three-dimensional pattern using the moire phenomenon.

In one embodiment of the present invention, the diameter may have a range of 50 to 150 μm.

In one embodiment of the present invention, the size may be 1/2 or less than the diameter.

In an embodiment of the present invention, the microlenses are spaced apart from each other at regular intervals at a first pitch, and the printed pattern is spaced apart from each other at a second pitch equal to the first pitch.

Here, the printing patterns are arranged adjacent to each other and are divided into a plurality of pattern groups by shape, and each of the groups is uniformly eccentric with respect to the center of each of the microlenses and includes overlapping printing patterns. The pattern groups may implement different shapes according to the viewing angle.

In addition, the groups include a first group including first printing patterns concentrically overlapped with respect to the centers of the microlenses, and second printing patterns eccentrically overlapped at the same distance to the left with respect to the centers of the microlenses. It includes a second group and a third group including third printed patterns that are eccentrically overlapped by the same distance to the right with respect to the center of the microlenses.

In an embodiment of the present invention, the three-dimensional pattern may be implemented with a magnification that decreases as the tilt angle increases.

According to the three-dimensional sheet label according to the embodiments of the present invention, the size of the three-dimensional pattern to be implemented by the moire phenomenon can be adjusted as the print patterns are arranged at a tilt angle tilted with respect to the arrangement direction of the microlenses provided in the lens array. have.

That is, a three-dimensional pattern can be expressed even if the microlenses and printing patterns do not exactly match each other. In particular, there is an effect of freely setting the size of the three-dimensional pattern by adjusting the magnification by adjusting the angle at which the lens array and the pattern array overlap.

Meanwhile, as the transparent substrate has a relatively small thickness, although printing patterns are located at a position shorter than the focal length of the microlens having a relatively large diameter, the height and the radius of curvature of the lens are adjusted to focus the microlens. The distance and the position of the printing patterns are matched to make it visible, and in that case, the thickness of the transparent substrate can be adjusted in the range of 50㎛ to 250㎛.

In addition, in the case of manufacturing an ultra-thin label beyond the thickness control range, the reflective layer formed on the bottom surface of the pattern sheet reflects light passing through the lens array and the transparent substrate.

As a result, as the microlenses have a relatively large diameter, the thickness of the transparent substrate can be made thin despite having a relatively inter-focal length, so that a three-dimensional sheet label can be manufactured to a thickness of several µm to 20 µm.

1 is a cross-sectional view illustrating a three-dimensional sheet label according to an embodiment of the present invention.
FIG. 2 is a photograph illustrating an arrangement of a lens array and a pattern array included in the three-dimensional sheet label of FIG. 1.
3 is a plan view illustrating the pattern groups of FIG. 1.
4 is a cross-sectional view illustrating a three-dimensional sheet label according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the present invention, various modifications may be made and various forms may be applied, and specific embodiments will be illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to a specific form disclosed, it should be understood to include all changes, equivalents, and substitutes included in the spirit and scope of the present invention. In the accompanying drawings, the sizes and amounts of objects are shown to be enlarged or reduced from the actual size for clarity of the present invention.

Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. These terms are used only for the purpose of distinguishing one component from another component. For example, without departing from the scope of the present invention, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element.

The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In the present application, terms such as "comprise" or "include" are intended to designate the existence of features, steps, functions, components, or combinations thereof described in the specification, and other features, steps, functions, and components It is to be understood that the possibility of addition or presence of or combinations thereof is not preliminarily excluded.

Meanwhile, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the technical field to which the present invention belongs. Terms such as those defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and should not be interpreted as an ideal or excessively formal meaning unless explicitly defined in this application. Does not.

1 is a cross-sectional view illustrating a three-dimensional sheet label according to an embodiment of the present invention. FIG. 2 is a photograph illustrating an arrangement of a lens array and a pattern array included in the three-dimensional sheet label of FIG. 1. 3 is a plan view illustrating the pattern groups of FIG. 1.

1 to 3, a three-dimensional sheet label 100 according to an embodiment of the present invention includes a transparent substrate 110, a lens array 130, and a pattern array 150. The three-dimensional sheet label 100 may implement a three-dimensional pattern through a moire phenomenon using incident light incident from the outside.

The transparent substrate 110 has optically transparent properties. The transparent substrate 110 may be made of a transparent polymer resin such as acrylic, polycarbonate (PC), polypropylene (PP), polyethylene (PE) or polyethylene terephthalate (PET). That is, the transparent substrate 110 may be made of a polymer material having optically transparent properties.

The lens array 130 is provided on the upper surface of the transparent substrate 110. The lens array 110 may include a plurality of micro lenses 131 arranged in a first direction. The micro lenses 131 may be spaced apart from each other at regular intervals, that is, at a first pitch P1 (see FIG. 3 ).

Alternatively, the micro lenses 131 may have a hexagonal shape.

The microlenses 131 may be arranged in a first column arranged in the first direction and a second column arranged in the first direction and spaced apart from the first column. Accordingly, the microlenses adjacent to each other may be arranged in a trapezoidal shape (see FIG. 2 ).

In addition, the microlenses 131 may be arranged in a second direction perpendicular to the first direction. Accordingly, the micro lenses 131 may be arranged in a matrix form.

Each of the micro lenses 131 may have a convex lens shape. That is, each of the micro lenses 131 may be formed in a hemispherical shape having a diameter. Alternatively, the micro lenses 131 may have a concave lens shape instead of a convex lens shape.

Each of the micro lenses 131 may have a diameter in the range of 50 to 150 μm. As each of the microlenses 131 has a relatively large diameter, an imprinting process of forming the microlenses 131 may be more effectively performed. Further, the microlenses 131 and the print patterns 151 corresponding to each of the micro lenses 131 may be formed to more easily correspond to 1:1.

In particular, when the printing patterns 151 are arranged in a tilt direction tilted at a tilt angle with respect to the first direction in which the micro lenses 131 are arranged, the micro lenses 131 have a relatively large diameter. Accordingly, the amount of change in size of the three-dimensional pattern implemented according to the printing patterns 151 according to the change of the tilt angle may be reduced. Accordingly, as the microlenses 131 have a relatively large diameter, it is possible to reduce an error in a three-dimensional pattern due to an error in a tilt angle.

Moreover, when the roll-to-roll imprinting process of forming the three-dimensional sheet label 100 by mutually imprinting the lens sheet on which the microlenses 131 are formed and the pattern sheet on which the printing patterns 151 are formed is performed, the microlens An alignment process of aligning the s 131 and the print patterns 151 with each other may be performed more smoothly.

The pattern array 150 is provided on the lower surface of the transparent substrate 110. The pattern array 150 includes a plurality of printing patterns 151. The printing patterns 151 may correspond to the micro lenses 131 on a one-to-one basis.

The printing patterns 151 are arranged along a tilt direction having a tilt angle tilted with respect to the first direction in which the micro lenses 131 are arranged. That is, when the first direction is a horizontal direction, the tilt direction may correspond to an inclined horizontal direction.

The printing patterns 151 may have a size smaller than the diameter. For example, when the printing patterns 151 have a square shape, the size corresponds to the length of one side. When the printing patterns 151 have a circular shape, the size corresponds to the diameter of one side. In addition, when the printing patterns 151 have a star shape, the size corresponds to the longest length between vertices.

The size may be 1/2 or less than the diameter of each of the micro lenses 131. As a result, each of the printing patterns 151 may be easily overlapped from the inside of each of the microlenses 131 along the radial direction with respect to the center of the microlenses 131.

Referring to FIG. 2, it is shown that the tilt angle is 1.3 degrees. In this case, as the printing patterns 151 are arranged at a tilt angle tilted with respect to the first direction, they are shifted from the micro lenses 131. Accordingly, an interference fringe may occur according to a density difference between the printed patterns 151 and the microlenses 131 repeatedly formed periodically. A three-dimensional pattern may be implemented by the moiré phenomenon.

A magnification at which the tilt angle implements a three-dimensional pattern may be reduced. The relationship between the tilt angle and the magnification is described in Table 1 below as an example.

Tilt angle (ㅀ) Magnification (x) 1.0 57 1.3 44 1.5 38 2.0 29 2.5 23

Meanwhile, the tilt angle may be adjusted within a range of 0.5 to 2.5 degrees. For example, when the tilt angle is less than 0.5, the printed patterns 151 almost completely overlap the micro lenses 131 one-to-one. In this case, as each of the microlenses 131 has a relatively large diameter, the three-dimensional sheet label 100 has an excessively large magnification. Therefore, the three-dimensional pattern may be excessively enlarged and nothing may be seen when visually identified. On the other hand, when the tilt angle exceeds 2.5 degrees, the three-dimensional sheet label 100 cannot implement a magnification equivalent to the diameter of the microlens 131.

That is, when the roll-to-roll bonding process of forming the three-dimensional sheet label 100 by bonding the lens sheet on which the microlenses 131 are formed and the pattern sheet on which the printing patterns 151 are formed is performed, the microlenses ( When performing the alignment process of aligning the 131 and the printing patterns 151 with each other, the tilt angle is easily adjusted, so that the size of the three-dimensional pattern to be implemented can be easily adjusted. Accordingly, when it is necessary to change the size of the three-dimensional pattern, a separate mold for forming a printing pattern having a different size is not required, and the size of the three-dimensional pattern can be simply changed by simply adjusting the tilt angle.

Referring to FIG. 3, in an embodiment of the present invention, the microlenses 131 are spaced apart from each other at regular intervals at a first pitch P1. Meanwhile, the printing patterns 151 are spaced apart from each other by a second pitch P2 equal to the first pitch. In this case, the first pitch P1 corresponds to a separation distance at each central point of the microlenses 131 adjacent to each other. In addition, the second pitch P2 corresponds to a separation distance from each central point of the printing patterns 151 adjacent to each other.

Further, the printing patterns 151 are arranged adjacent to each other, and are divided into a plurality of pattern groups 161, 162, and 163 according to shape. The pattern groups 161, 162, and 163 are formed in different shapes.

At this time, each of the pattern groups 161, 162, and 163 is uniformly eccentric with respect to the center of each of the microlenses and includes overlapping printed patterns 51, so that the pattern groups 161, 162, 163) can implement different shapes depending on the viewing angle.

For example, the pattern groups 161, 162, and 163 include a first group 161 including first printing patterns concentrically overlapped with respect to the centers of the micro lenses 131, the micro lenses ( The second group 162 including second printed patterns that are eccentric to the left with the same distance to the center of the 131) and overlapped, and the second group 162 that is eccentric to the right with the same distance to the center of the microlenses 131 and overlapped It includes a third group 163 including three printing patterns.

In this case, when the three-dimensional sheet label 100 is viewed from the front, only shapes corresponding to the first printing patterns belonging to the first group 161 may be implemented. That is, when viewed with the naked eye, only the star shape is recognized, but the circle and the square are not recognized.

Meanwhile, when the three-dimensional sheet label is viewed from the left, only the shapes corresponding to the second printing patterns belonging to the second group 162 eccentric to the left may be implemented. That is, when viewed with the naked eye, only a circle is recognized, but a star shape and a square are not recognized.

Alternatively, when the three-dimensional sheet label is viewed from the right, only shapes corresponding to the third printing patterns belonging to the third group 163 eccentric to the right may be implemented. That is, when viewed with the naked eye, only a square is recognized, but a star shape and a circle are not recognized.

Accordingly, different shapes may be implemented according to the viewing angle of the three-dimensional sheet label 100.

Further, by overlapping the printing patterns eccentrically upward, downward, or inclined with respect to the central point of each of the microlenses 131, it is possible to implement a selective three-dimensional pattern with a viewing angle corresponding to the eccentric direction.

4 is a cross-sectional view illustrating a three-dimensional sheet label according to an embodiment of the present invention.

Referring to FIG. 4, a three-dimensional sheet label 200 according to an embodiment of the present invention includes a transparent substrate 210, a lens array 230, and a pattern array 250.

The transparent substrate 210 has a thickness less than or equal to the focal length of the micro lenses 231.

In general, the transparent substrate 210 has a thickness corresponding to the focal length of the microlenses 231. However, when the diameters of the micro lenses 231 are relatively large, each of the micro lenses 231 has a relatively large focal length. Accordingly, the transparent substrate 210 is manufactured to a thickness of 50 μm to 250 μm depending on the height and radius of curvature of the micro lens. As a result, when the three-dimensional sheet label is manufactured in the form of an ultra-thin film, there is a problem that the shape of the three-dimensional pattern is blurred.

In order to solve the above-described thickness problem of the transparent substrate 210, the three-dimensional sheet label 200 may further include a pattern sheet 255 and a reflective layer 260.

The pattern sheet 255 is provided on the lower surface of the transparent substrate 210 to cover the printing patterns 251.

The reflective layer 260 is formed on the pattern sheet 255. The reflective layer 260 may reflect light toward the microlenses 231. Accordingly, the light passing through the lens array 230 and the transparent substrate 210 is reflected from the reflective layer 260 toward the pattern array 250, thereby implementing a three-dimensional pattern with shades. That is, the contrast ratio of the three-dimensional pattern may be increased. As a result, even though the transparent substrate 210 has a thickness smaller than the focal length, since the three-dimensional pattern is clearly implemented, the three-dimensional sheet label 200 can be made ultra-thin, and conversely, a thick label can be produced.

Although the present invention has been shown and described with reference to a preferred embodiment as described above, it is not limited to the above embodiment, and within the scope not departing from the spirit of the present invention, various It can be transformed and changed. Such modifications and variations are to be viewed as falling within the scope of the present invention and the appended claims.

The three-dimensional sheet label can be used by attaching it to a wide range of passports, ID cards, currency, cosmetics, and home appliances, as in the existing technology.

100: three-dimensional sheet label 110: transparent substrate
130: lens array 131: micro lenses
150: pattern array 151: printing patterns
255: pattern sheet 260: reflective layer

Claims (9)

Optically transparent transparent substrate;
A lens array including a plurality of microlenses each having a hemispherical shape of a diameter and arranged along a first direction on an upper surface of the transparent substrate; And
A three-dimensional pattern can be implemented using a moire phenomenon by including a plurality of printing patterns each having a size smaller than the diameter and arranged along a tilt direction having a tilt angle tilted with respect to the first direction on the lower surface of the transparent substrate. It includes a pattern array provided to be,
The transparent substrate has a thickness less than the focal length of the microlenses,
A pattern sheet provided on a lower surface of the transparent substrate to cover the printing patterns; And
A three-dimensional sheet label, further comprising a reflective layer formed on the pattern sheet and reflecting light toward the microlenses. The three-dimensional sheet label of claim 1, wherein the diameter is in the range of 50 to 150 μm. The three-dimensional sheet label of claim 1, wherein the size is 1/2 or less than the diameter. The three-dimensional sheet label of claim 1, wherein the microlenses are spaced apart from each other at regular intervals at a first pitch, and the printing pattern is spaced apart from each other at a second pitch equal to the first pitch. The method of claim 4, wherein the printing patterns are arranged adjacent to each other and divided into a plurality of pattern groups for each shape,
Each of the groups is uniformly eccentric with respect to the center of each of the microlenses and includes overlapping printing patterns, so that the pattern groups may implement different shapes according to a viewing angle. The method of claim 5, wherein the groups include: a first group including first printing patterns concentrically overlapped with respect to the centers of the micro lenses;
A second group including second printed patterns eccentrically overlapped to the left with respect to the centers of the microlenses; And
And a third group including third printed patterns that are eccentric to the right with the same distance to the center of the microlenses and overlapped. The three-dimensional sheet label of claim 1, wherein the three-dimensional pattern is implemented at a magnification that decreases as the tilt angle increases. The three-dimensional sheet label of claim 7, wherein the tilt angle is in the range of 0.5 to 2.5 degrees. delete

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