TWM520026U - Security sheet with micro lens array - Google Patents

Abstract

A security sheet with micro lens array utilizes two overlapped micro lens arrays as one of security structures. Explicit security is achieved by modifying lens sizes, lens types or lenses arrangement in the micro lens arrays of the security sheet.

Description

Security sheet with microlens array

This case relates to the field of anti-counterfeiting structures, and more particularly to the field of security sheets having microlens arrays.

Anti-counterfeiting marks are necessary for modern financial products or general consumer products. For these products, the mark of explicit anti-counterfeiting helps users to identify their authenticity under visual observation. Such anti-counterfeiting structure If it is not easy to counterfeit at the same time, it is one of the goals of the industry.

Chinese Patent Publication No. CN101434176 discloses an optical security element and a product with the optical security element. The optical security element includes a planar diffraction type microlens array on a first surface of a base layer, and a miniature pattern array corresponding to the planar diffraction type microlens array on the second surface of the base layer, using a planar diffraction type micro The lens array exhibits magnification, depth of field, or dynamic effects of the array of miniature patterns. Such a structure is a general application of a matching microlens array and a miniature pattern array, and thereby achieves a dominant anti-counterfeiting effect.

The present invention provides a security sheet having a microlens array, which is formed into a structure having an anti-counterfeiting effect by using two microlens array regions in an overlapping position relationship, which can be applied to a sticker having a small thickness, and can also be applied to a general thickness. On the card.

The present invention provides a security sheet having a microlens array comprising two layers of overlap The microlens array region, wherein one layer of the microlens array can also overlap with the micropattern, but the microlens array does not affect the visual representation of the micropattern.

According to the above, a security sheet having a microlens array includes: a substrate having a first surface and a second surface opposite to each other; a first microlens array on the first surface; a microlens area on the second surface and a micro-pattern area, the microlens area and the first microlens array of the first surface are in an upper and lower position overlapping relationship, wherein the microlens area comprises a second microlens The array, the lens period of the second microlens array and the lens period of the first microlens array are the same or similar, and the effect of thinning the security sheet is achieved.

According to the above, a security sheet having a microlens array includes: a substrate having a first surface and a second surface opposite to each other; a first microlens array on the first surface; a second microlens array of the second surface and a micro-pattern area, the second microlens array and the first microlens array of the first surface are in an up-and-down position overlapping relationship, the second microlens array and the micro The pattern regions are separated or abutted together, wherein the lens period of the second microlens array is a reference value, and the lens period of the first microlens array is different from the lens period of the second microlens array by no more than 10 %.

Preferably, the first microlens array comprises a plurality of first microlens units, the second microlens array comprising a plurality of second microlens units, each of the first microlens units having a size and a lens shape and each The size and lens shape of the second microlens unit are the same or different.

Preferably, the first microlens array comprises a plurality of first microlens units, the second microlens array comprises a plurality of second microlens units, each of the first microlens units protruding from the first surface A spherical or aspherical convex lens, each of the second microlens units being a concave lens recessed on the second surface.

Preferably, at least a portion of the second microlens array is arranged in a geometric shape, a number, a letter or has a contour.

Preferably, the micropattern area comprises a photographic holographic pattern, a dot matrix hologram pattern or a printed pattern.

Preferably, the substrate has a thickness of less than 60 microns.

Preferably, the substrate has a thickness of less than 50 microns.

Preferably, the second microlens array comprises a blank area without the second microlens unit.

Preferably, the substrate has a thickness of less than 200 microns.

Preferably, the lens period of the second microlens array is a reference value, and the lens period of the first microlens array is different from the lens period of the second microlens array by no more than 5%.

According to the above, a security sheet having a microlens array is used as one of the anti-counterfeiting structures by using two microlens arrays having an overlapping positional relationship, and the lens size, shape and arrangement shape of the microlenses in the microlens array are adjusted to achieve Sexual anti-counterfeiting function.

In order to further understand the techniques, means and effects of this creation for the intended purpose, please refer to the following detailed description and drawings of this creation. The purpose, features, and characteristics of the present invention are to be understood as an in-depth and specific understanding.

1‧‧‧Anti-counterfeit sheet

5‧‧‧ eyes

15‧‧‧ blocks

11‧‧‧ first surface

12‧‧‧Substrate

13‧‧‧ second surface

222‧‧‧First microlens unit

22‧‧‧First microlens array

24‧‧‧Microlens area

26‧‧‧Micropattern area

242‧‧‧Second microlens unit

28‧‧‧Second microlens array

P‧‧‧ lens cycle

32‧‧‧Metal plating

FIG. 1 is a perspective view of a security sheet having a microlens array of the present invention.

2 is a schematic enlarged plan view of a security sheet having a microlens array of the present invention. Figure.

3 is a bottom enlarged view of the security sheet having the microlens array of the present invention.

4 is a first cross-sectional enlarged view of the security sheet having the microlens array of the present invention.

FIG. 5 is an enlarged cross-sectional view showing a second section of the security sheet having the microlens array of the present invention.

Figure 6 is an enlarged schematic view showing the first microlens array of the first surface of the present invention.

Fig. 7 is an enlarged schematic view showing a second microlens area of the second surface of the present invention.

FIG. 1 is a perspective view of a security sheet having a microlens array of the present invention. 2 is a schematic enlarged plan view showing any block of the anti-counterfeit sheet having the microlens array of the present invention. FIG. 3 is a bottom view enlarged view of any block of the anti-counterfeit sheet having the microlens array of the present invention. Referring to FIG. 1, the security sheet 1 includes a substrate 12, a first surface 11 and a second surface 13, wherein the first surface 11 and the second surface 13 constitute upper and lower surfaces of the substrate 12 and are opposite to each other, and the first surface 11 The length and width of the second surface 13 are much greater than the thickness of the substrate 12. In one embodiment, the thickness of the substrate 12 is less than 60 micrometers, and even the thickness of the substrate 12 is less than 50 micrometers. Therefore, the security sheet 1 can be applied to the security sheet of the sticker, but the present invention is not limited thereto, and the substrate 12 is not limited thereto. The thickness can be thicker, for example 200 microns, so that it can be applied to general cards, such as security sheets such as credit cards or wafer cards. Second, the substrate 12 can be transparent or light transmissive, and the material can be PET, PVC, PC, PMMA, and the like. The substrate 12 may be a single or composite material, or may be a single or multiple layer formed sheet.

Furthermore, the first surface 11 and the second surface 13 are flat on the macro view. Referring to FIG. 1 and FIG. 2 simultaneously, the first surface 11 of any of the blocks 15 of the security sheet 1 is covered by a plurality of first microlens units 222 from the microscopic point of view. In an embodiment, the first microlens units 222 are regularly arranged to form a two-dimensional first microlens array 22, wherein the size and shape of the first microlens units 222 on the first surface 11 may be the same or different, and A plurality of first microlens units 222 may be arranged to have a specific shape, which will be described in detail later. Furthermore, the first microlens array 22 can be a refractive microlens array or a diffraction microlens array, and the first microlens unit 222 can be a spherical or aspherical convex lens.

Next, please refer to FIG. 1 and FIG. 3 simultaneously. From a microscopic view, the second surface 13 includes at least one or more microlens regions 24 and one or more micropattern regions 26, wherein the plurality of microlens regions 24 or micropatterns Regions 26 can be separate or abutting together. In one embodiment, the microlens region 24 includes a plurality of second microlens units 242 arranged to form a two-dimensional second microlens array 28, wherein at least a portion of the second microlens array 28 may have a specific shape It can also be a refractive microlens array or a diffraction microlens array. Additionally, in addition to the second microlens array 28, the microlens region 24 may also include a plurality of blank planes; the second microlens array 28 itself may also include portions of a plurality of blank lensless units. Second, the micropattern area 26 can include a photographic holographic pattern, a dot matrix hologram pattern, or other digital pattern or printed pattern.

Referring to FIG. 1-3 at the same time, in the embodiment, if the security sheet 1 is viewed by the eye 5, the microlens area 24 of the second surface 13 overlaps with the first microlens array 22 of the first surface 11, the microlens The lens pitch of the second microlens unit 242 arranged in the region 24 and the lens period of the first microlens unit 222 of the first surface 11 of the relative position are the same or similar. For example, the difference between the period of the first microlens unit 222 and the period of the second microlens unit 242 is not greater than the difference. +/-10%, preferably +/-5%, with the period of the second microlens unit 242 having a period of 50 μm as a reference value, the period of the first microlens unit 222 is between 45 μm and 55 μm to 47.5 μm. It is preferably 52.5 μm. In this way, the eye 5 can see that the microlens area 24 exhibits a bright spot distribution. When the microlens area 24 is formed with a contoured shape, such as a triangle, the eye 5 can see that the bright spots are distributed in a triangular shape. In addition, if the security sheet 1 is viewed with the eye 5, the micropattern region 26 of the second surface 13 is transmitted through the first microlens array 22 of the first surface 11, i.e., the micropattern region 26 itself, i.e., the performance of the micropattern region 26. It is not affected by the first microlens array 22 of the first surface 11 and becomes blurred and unrecognizable.

In the present invention, the first microlens unit 222 and the second microlens unit 242 having the same size or shape may be formed by inkjet, and the first microlens array 22 and the second microlens array respectively forming the security sheet 1 may be arranged. 28, wherein the arrangement through the second microlens array 28 can be formed with a particular shape in the microlens region 24 or such that the microlens region 24 itself exhibits a particular shape, such as geometry, numbers, letters, animals, plants, and the like. Therefore, in the present case, the size of the first microlens unit 222 and the second microlens unit 242 itself, the arrangement of the lens period, and the variation of the specific contour shape are used to constitute one of the anti-counterfeiting structures of the security sheet 1 of the present invention, which can be micro- The anti-counterfeiting design of the pattern area 26 together forms the security structure of the security sheet 1. It should be noted that the microlens array and micropattern of the present invention can also be formed on the substrate by other suitable means, such as, but not limited to, etching, engraving, precision printing or nano printing.

4 is a first cross-sectional enlarged view of the security sheet having the microlens array of the present invention. Referring to FIG. 1 and FIG. 4 simultaneously, the first microlens unit 222 of the first surface 11 is a spherical or aspherical convex lens protruding from the first surface 11, and the second microlens unit 242 of the second surface 13 is concavely second. a concave lens of the surface 13, such that the microlens region 24 of the second surface 13 is on the first surface 11 A concentrating effect is generated under a microlens unit 222 to present a bright spot distribution. It should be noted that the second microlens unit 242 of the present invention is not limited to the concave lens of FIG. 4, and may be a convex lens or other form of lens. The arrangement of such a microlens array in this case can achieve the effect of thinning the substrate 12 in addition to the distribution of specific bright spots. Alternatively, after forming the first microlens array 22 of the first surface 11 or the second microlens array 28 forming the second surface 13, forming on the first microlens unit 222 or the second microlens unit 242 Other layers are used to exhibit other optical or protective effects. For example, as shown in FIG. 5, a metal plating layer 32 is formed on both the microlens region 24 and the micropattern region 26 of the second surface 13.

6 and 7 are enlarged schematic views showing the first microlens array of the first surface of the present invention and the second microlens area of the second surface, respectively. Referring to FIGS. 6 and 7, the lens period P of the first microlens array 22 of the first surface 11 and the second microlens array 28 of the second surface 13 are the same, and the second microlens array 28 in the microlens region 24 is the same. The second microlens unit 242 has a smaller lens size, and the smaller second microlens units 242 are arranged in an "E" shape. In this way, when the human eye is viewed from the first surface of the security sheet, it can be seen that the bright spots are distributed in an "E" shape. It should be noted that the shape of the "E" in FIG. 7 is illustrated by the second microlens unit 242 of 3-4 rows, in practice, according to the degree that the human eye can recognize and the size of the second microlens unit 242. Accordingly, the second microlens array 28 arranged in a specific shape may include 10 ⁿ (n is an integer greater than 2) columns or rows of second microlens units 242.

According to the above, in the present case, two microlens arrays with upper and lower overlapping positional relationships are used as one of the anti-counterfeiting structures, wherein the lens periods of the two microlens arrays are the same or similar. By controlling the size, shape, and arrangement of the microlens units in the microlens array in a specific shape, bright spots or dark spots of a specific shape are displayed on the macroscopic view, and the effect of thinning the security sheet is thinned. The case will be slightly transparent The anti-counterfeiting structure formed by the mirror array combined with the anti-counterfeiting structure of the micro-pattern can increase the dimension of the anti-counterfeiting design of the anti-counterfeit sheet, thereby increasing the security of the anti-counterfeiting design and the convenience of identification. Such a security sheet can be utilized for a thin sticker. Anti-counterfeiting and thicker credit card or wafer card.

The above description is only the preferred embodiment of the present invention, and is not intended to limit the scope of the claims. Therefore, any equivalent changes or modifications made without departing from the spirit of the present invention should be included in the present invention. Within the scope of creation.

1‧‧‧Anti-counterfeit sheet

5‧‧‧ eyes

15‧‧‧ blocks

11‧‧‧ first surface

12‧‧‧Substrate

13‧‧‧ second surface

Claims (16)

A security sheet having a microlens array, comprising: a substrate having a first surface and a second surface opposite to each other; a first microlens array on the first surface; and a microlens area of the two surfaces and a micro-pattern area, the microlens area and the first microlens array of the first surface are in an upper and lower position overlapping relationship, wherein the microlens area comprises a second microlens array, The lens period of the second microlens array is the same as the lens period of the first microlens array. The security sheet having a microlens array according to claim 1, wherein the first microlens array comprises a plurality of first microlens units, and the second microlens array comprises a plurality of second microlens units, each The size of the first microlens unit is the same as or different from the size of each of the second microlens units. The security sheet having a microlens array according to claim 1, wherein the first microlens array comprises a plurality of first microlens units, and the second microlens array comprises a plurality of second microlens units, each The lens shape of the first microlens unit is the same as or different from the lens shape of each of the second microlens units. The security sheet having a microlens array according to claim 1, wherein the first microlens array comprises a plurality of first microlens units, and the second microlens array comprises a plurality of second microlens units, each The first microlens unit is a spherical or aspherical convex lens protruding from the first surface, and each of the second microlens units is a concave lens recessed on the second surface. A security sheet having a microlens array according to claim 2, 3 or 4, wherein at least a portion of the second microlens array is arranged in a geometric shape, a number, a letter or has a contour. The anti-counterfeit sheet having a microlens array according to claim 2, 3 or 4, wherein the micro-pattern area comprises a photographing hologram pattern, a dot matrix hologram pattern or a print pattern. A security sheet having a microlens array according to claim 2, 3 or 4, wherein the substrate has a thickness of less than 60 microns. A security sheet having a microlens array according to claim 2, 3 or 4, wherein the substrate has a thickness of less than 50 microns. A security sheet having a microlens array, comprising: a substrate having a first surface and a second surface opposite to each other; a first microlens array on the first surface; and a second microlens array of the two surfaces and a micro-pattern area, the second microlens array and the first microlens array of the first surface are in an up-and-down position overlapping relationship, the second microlens array and the micro-pattern area Separating or abutting together, wherein a lens period of the second microlens array is a reference value, and a lens period of the first microlens array is different from a lens period of the second microlens array by no more than 10%. The security sheet having a microlens array according to claim 9, wherein the first microlens array comprises a plurality of first microlens units, and the second microlens array comprises a plurality of second microlens units, each The size and lens shape of the first microlens unit are the same as or different from the size and lens shape of each of the second microlens units. The security sheet having a microlens array according to claim 9, wherein the first microlens array comprises a plurality of first microlens units, and the second microlens array comprises a plurality of second microlens units, each The first microlens unit is a spherical or aspherical convex lens protruding from the first surface, and each of the second microlens units is a concave lens recessed on the second surface. The security sheet having a microlens array according to claim 9, 10 or 11, wherein the second microlens array comprises a blank area without the second microlens unit. A security sheet having a microlens array according to claim 9, 10 or 11, wherein the substrate has a thickness of less than 200 microns. The security sheet having a microlens array according to claim 13, wherein the substrate has a thickness of less than 60 μm. The security sheet having a microlens array according to claim 13, wherein the substrate has a thickness of less than 50 μm. The anti-counterfeit sheet having a microlens array according to claim 9, wherein a lens period of the second microlens array is a reference value, and a lens period of the first microlens array is to the second microlens array The difference in lens period is no more than 5%.