Optical security device based on a rotating surface

Abstract

To provide certain optical articles which are used by some documents, such as monetary instruments, certificates, and / or the like to combat counterfeiting.SOLUTION: An optical article 102 printed on a substrate 104 comprises: an organic binder; and a plurality of reflective magnetic platelets provided in the organic binder, wherein the plurality of reflective magnetic platelets are aligned in accordance with at least part of a surface of revolution, the plurality of reflective magnetic platelets are aligned to cause a first reflective effect of the optical article 102 when the substrate 104 is rotated around a first axis and to cause a second reflective effect of the optical article 102 when the substrate is rotated around a second axis, and the first reflective effect is different from the second reflective effect.SELECTED DRAWING: Figure 1A

Description

[Background technology]

[0001] Some documents, such as currency instruments, certificates, etc., contain some optical properties to resist counterfeiting. An example of such an optical article is a variable viewing angle article. It is an ink having optical properties (e.g., color, reflectivity) of Summary of the Invention [Means for solving the problem]

[0002] In some possible embodiments, the optical article printed on the substrate comprises an organic binder and and a plurality of reflective magnetic platelets disposed within said organic binder, said plurality of reflective magnetic platelets The platelets are aligned to generally coincide with at least a portion of the surface of rotation, and the plurality of counter plates The reflective magnetic platen provides a first reflective effect of the optical article when the substrate is rotated about a first axis. and a second reflection of the optical article when the substrate is rotated about a second axis. the first reflective effect being different from the second reflective effect. and the plurality of reflective magnetic plates, such that:

[0003] In some possible embodiments, the method of forming a printed optical article on a substrate comprises: providing an organic binder containing a number of reflective magnetic platelets on the substrate; a magnetic field applying step of applying a magnetic field to the organic binder using a magnet, The magnetic field rotates the plurality of reflective magnetic plates so as to substantially coincide with at least a portion of a plane of rotation. the plurality of reflective magnetic plates are aligned with the optical axis when the substrate is rotated about a first axis. and rotating the substrate about a second axis to produce a first reflective effect of the optical article. aligned to produce a second reflection effect of the article, the first reflection effect being different from the second reflection effect such that, the magnetic field applying step, and the step of solidifying or curing the organic binder can be provided.

[0004] In some possible embodiments, the document is an optical article having a plurality of reflective magnetic platelets wherein the plurality of reflective magnetic platelets are aligned to substantially coincide with at least a part of a rotation surface, and the plurality of reflective magnetic platelets are such that when the optical article rotates about a first axis, a first reflection effect of the optical article is produced, and also when the optical article rotates about a second axis, a second reflection effect of the optical article is produced, the first reflection effect being different from the second reflection effect, and the optical article can be provided.

Brief Description of the Drawings

[0005]

Figure 1A

Figure 1B

Figure 1C

Figure 1D

Figure 1E

Figure 2A

Figure 2B

Figure 3A

Figure 3B

Figure 3C

Figure 3D

Figure 4

Mode for Carrying Out the Invention

[0006] Exemplary embodiments will be described in detail below with reference to the accompanying drawings. The same reference signs in different drawings can identify the same or similar elements.

[0007] The optical article can generate a reflection effect based on the angle of light or the viewing angle. Several optical articles can use reflective magnetic platelets to produce such a reflection effect. For example, the magnetic platelets can be dispersed in an organic binder and coated on a substrate such as a document , currency, certificate, transaction card). The magnetic platelets can be aligned according to a magnetic field that can exhibit the reflection characteristics of a three-dimensional mirror shaped like the magnetic platelets (for example, by using a magnetic field). This can be referred to as a Fresnel-like reflection effect. The organic binder can be solidified or cured (for example, by using curing, ultraviolet rays, heat, epoxy, etc.). In particular, the optical article can be thin (for example, it may not be much thicker than the substrate) and can have flexibility to form useful optical articles for currency and other such applications.

[0008] Some embodiments described herein provide optical articles based on surfaces of revolution. , a three-dimensional surface that results from rotating a two-dimensional curve around an axis. Some embodiments described herein may be based on a surface of revolution. A magnetic field generated based on the plane of rotation can be used to produce the effect. Some embodiments described herein are based on a funnel-shaped surface of revolution and have leakage in some orientations. Other embodiments described herein are based on saddle-shaped surfaces of revolution. It is also capable of providing a reflective effect similar to a saddle in some orientations.

[0009] The optical article described above is characterized in that the optical element rotates when the substrate (or the optical article) rotates about the first axis. The plurality of reflective magnetic plates are arranged to form a first reflective effect on the article, and the substrate or optical article is arranged to form a first reflective effect on the article. a magnetic field aligned to produce a second reflective effect of the optical article when rotated about a second axis; The magnetic plate can have a reflective effect as well as a magnet configuration that aligns the magnetic plate accordingly. are described in more detail below. By creating a reflective effect, the optical article can be rotated in a circular arc, which is a more precise and accurate way than optical articles that use a single axis of rotation. , increasing the complexity of the optical article, and therefore compared to documents using a single axis of rotation. This increases the security of documents that use this optical article.

[0010] 1A-1E show an example 100 of an optical article 102 formed based on a funnel-shaped surface of revolution. 1 is an explanatory diagram of a first view (for example, a front view in a state where the substrate 104 is not rotated around an axis line). An enlarged view of the optical article 102 at ) is shown at the top of FIG. 1A, where the substrate 104 is It is a document like a banknote. In some embodiments, the substrate 104 can be one that does not contain a document. For example, the optical article 102 can be formed on a substrate that is attached to the document (e.g., before or after forming the optical article 102).

[0011] As shown in the figure, the optical article 102 exhibits a funnel-shaped reflection, and this funnel-shaped reflection can be based on the alignment of the magnetic platelets of the optical article 102 by a magnetic field based on the funnel-shaped rotation plane. This will be described in more detail below with respect to FIGS. 1B and 1C.

[0012] As indicated by reference numeral 106, when the substrate 104 (or the optical article 102) is rotated about a first axis (horizontal axis), this rotation can produce a first reflection effect 108. Here, the first reflection effect 108 is the enlargement (in the horizontal direction) of the top of the funnel-shaped reflection and the narrowing (in the horizontal direction) of the bottom of the funnel-shaped reflection. This can be based on the alignment of the magnetic platelets having a funnel-shaped rotation surface, as will be described in more detail below . In some embodiments, the first reflection effect can be the enlargement of the first part (e.g., the top) of the reflection and the narrowing of the second part of the reflection (e.g., the bottom).

[0013] As indicated by reference numeral 110, when the substrate 104 (or the optical article 102) is rotated about a second axis (vertical axis and / or an axis perpendicular to the first axis), this rotation can produce a second reflection effect 112 that is different from the first reflection effect 108. Here, the second reflection effect 112 is such that the leftward shift of the top of the funnel-shaped reflection occurs while the bottom point of the funnel-shaped reflection remains substantially immobile. In other words, the second reflection effect is the first lateral movement of the first part of the reflection (e.g., For example, it can be a shift to the left or right of the top of the funnel-shaped reflection), and this first lateral shift movement is greater than the second lateral movement of the second part of the reflection (e.g., the bottom point remains substantially stationary ).

[0014] FIG. 1B shows the rotational surface used to create the optical article 102 shown in FIG. 1A, as well as an example of the curve used to create the rotational surface. This curve is indicated by reference numeral 114. As shown in the figure shown, this curve can be defined based on the natural logarithm. In some embodiments it can be defined based on other mathematical relationships such as logarithms and / or the like. As indicated by reference numeral 116, the rotational surface can be created by rotating the curve around the Y-axis . The checkerboard display of the rotational surface is indicated by reference numeral 118 for clarity.

[0015] The rotational surface shown in FIG. 1B is shown for illustrative purposes only. The exact magnetic field used to align the magnetic platelets may vary due to variations in magnet fabrication, difficulties in magnetic field shaping, or other reasons and may be different from that shown in FIG. 1B. For example, the magnetic field deviation can vary within the range of about 0.7937 5 mm to 50.8 mm (0.03125 inches to 2 inches) and can vary even more based on the designer's choice and the choice of magnet size. The rotational surface described herein is merely exemplary and is to be understood as being presented for illustrative purposes.

[0016] FIG. 1C shows an example of a magnet 120 that can provide a magnetic field approximating the rotational surface indicated by reference numerals 116 and 118 in FIG. 1B. The plane of the optical article 102 is referenced indicated by reference numeral 122. As can be seen from the figure, the magnetic field lines generated by such a magnet can have different radii within the plane 122. Therefore, the optical article 102 that produces the funnel-shaped reflection effect shown in FIG. 1A can be formed using the magnet 120 shown in FIG. 1C based on the rotating surfaces 116, 118 shown in FIG. 1B.

[0017] An example of the optical article 102 is indicated by reference numeral 124 in FIG. 1D. For example, the example shown in FIG. 1D can show a cross-section of the optical article 102 at the center of the optical article 102. As shown in the figure, the optical article 102 can have an organic binder 126 in which reflective magnetic small plates 128 are suspended. Furthermore, as shown in the figure, the optical article 102 is provided on a substrate 1 30. The reflective magnetic small plates 128 can be aligned with the magnetic field lines 132.

[0018] FIG. 1E shows an oblique view of the magnetic field lines 132 in FIG. 1D. The central axis of the magnetic field represented by the magnetic field lines 132 is indicated by the symbol "x" specified by reference numeral 136. As can be seen from the figure, the radius of the magnetic field lines 132 changes along the central axis. As shown in the figure, the central axis of the magnetic field is below the substrate 130 in a magnetic field with a narrower cross-section, and as the magnetic field expands, it progresses toward the substrate 130 and penetrates the substrate 130. Other embodiments with different orientations of the central axis are also possible. For example, the central axis can be entirely above the substrate, entirely below the substrate, parallel to the substrate, penetrating the substrate, and / or in forms similar thereto and can be provided in such a manner. As described above, FIGS. 1A to 1E are presented as examples. Other embodiments are also possible, and in the figure

[0019] As mentioned above, FIGS. 1A to 1E are presented as examples. Other embodiments are possible, and also in the figure ​​​​It can be different from that described for 1A to 1E.

[0020] Figures 2A and 2B are explanatory diagrams of an example in another optical article formed based on a funnel-shaped rotating surface. The rotating surface used in Example 200 can be substantially similar to that used in Example 100 of FIGS. 1A to 1D, and thus is not shown.

[0021] An enlarged view of the optical article 202 in the first view (for example, a front view in a state where the substrate 204 does not rotate around the axis) is shown at the upper part of FIG. 2A. As shown in the figure, the optical article 202 exhibits a funnel-shaped reflection, and this funnel-shaped reflection has a narrower top and a wider bottom than the funnel-shaped reflection of the optical article 202. This is due to the difference in the shape and / or orientation of the magnet used to form the corresponding magnetic field, as will be described with respect to FIG. 2B below.

[0022] As indicated by reference numeral 206, when the substrate 204 (or the optical article 202) is rotated around the first axis (for example, a horizontal axis), this rotation can produce a first reflection effect 208. Here, the first reflection effect 208 is an enlargement (in the horizontal direction) of the top of the funnel-shaped reflection and a narrowing (in the horizontal direction) of the bottom of the funnel-shaped reflection. As indicated by reference numeral 210, when the substrate 204 (or the optical article 202) is rotated around the second axis (for example, a vertical axis and / or an axis perpendicular to the first axis), this rotation produces a second reflection effect 212 different from the first reflection effect 208. Here, the second reflection effect 212 is a leftward shift of the top of the funnel-shaped reflection.

[0023] FIG. 2B shows an example of a set of magnets 214 that generate a magnetic field approximating a rotational surface used to create the optical article 202. The plane of the optical article 202 is indicated by reference numeral 216. As shown, the arrangement in the set of magnets 214 produces a magnetic field having an elongated shape compared to the magnetic field shown in FIG. 1C. In some embodiments, more than two magnets 214 can be used. For example, any number of magnets 214 can be used to generate the illustrated magnetic field. Thus, the optical article 202 that imparts the funnel-shaped reflection effect shown in FIG. 2A can be formed using the set of magnets 214 shown in FIG. 2B. As described above, FIGS. 2A and 2B are presented merely as examples. Other embodiments are possible and can be different from those described with respect to FIGS. 2A and 2B. FIGS. 3A-3D are explanatory views of an example 300 of an optical article 302 formed based on a saddle-shaped rotational surface. An enlarged view of the optical article 302 in a first view (e.g., a front view with the substrate 304 not rotated about the axis) is shown at the top of FIG. 3A. As shown, the optical article 302 exhibits a saddle-shaped reflection (see the saddle-shaped rotational surface of FIG. 3C, which is described in detail below, as an example of the saddle shape). As indicated by reference numeral 306, when the optical article 302 is rotated in a first direction about a first axis (e.g., a horizontal axis), this rotation can produce a first reflection effect, in which the reflection has an edge that moves downward while the center remains substantially stationary. For example, the left and right portions of the reflection can curve downward. As indicated by reference numeral 308, when the optical article 302 is rotated in a second direction about the first axis, this rotation can produce a second reflection effect, in which the reflection has an edge that moves upward while the center remains substantially stationary. For example, the left and right portions of the reflection can curve upward. As described above, FIGS. 3A-3D are presented merely as examples. Other embodiments are possible and can be different from those described with respect to FIGS. 3A-3D. In some embodiments, the optical article can be formed using a magnetic field generated by a set of magnets, and the shape of the magnetic field can be adjusted to achieve a desired reflection effect.

[0024] As described above, FIGS. 2A and 2B are merely presented as examples. Other embodiments are possible and can be different from those described with respect to FIGS. 2A and 2B. FIGS. 3A-3D are explanatory views of an example 300 of an optical article 302 formed based on a saddle-shaped rotational surface. An enlarged view of the optical article 302 in a first view (e.g., a front view with the substrate 304 not rotated about the axis) is shown at the top of FIG. 3A. As shown, the optical article 302 exhibits a saddle-shaped reflection (see the saddle-shaped rotational surface of FIG. 3C, which is described in detail below, as an example of the saddle shape).

[0025] As indicated by reference numeral 306, when the optical article 302 is rotated in a first direction about a first axis (e.g., a horizontal axis), this rotation can produce a first reflection effect, in which the reflection has an edge that moves downward while the center remains substantially stationary. For example, the left and right portions of the reflection can curve downward. As indicated by reference numeral 308, when the optical article 302 is rotated in a second direction about the first axis, this rotation can produce a second reflection effect, in which the reflection has an edge that moves upward while the center remains substantially stationary. For example, the left and right portions of the reflection can curve upward. As described above, FIGS. 3A-3D are presented merely as examples. Other embodiments are possible and can be different from those described with respect to FIGS. 3A-3D. In some embodiments, the optical article can be formed using a magnetic field generated by a set of magnets, and the shape of the magnetic field can be adjusted to achieve a desired reflection effect. As described above, FIGS. 2A and 2B are merely presented as examples. Other embodiments are possible and can be different from those described with respect to FIGS. 2A and 2B.

[0026] As indicated by reference numeral 306, when the optical article 302 is rotated in a first direction about a first axis (e.g., a horizontal axis), this rotation can produce a first reflection effect, in which the reflection has an edge that moves downward while the center remains substantially stationary. For example, the left and right portions of the reflection can curve downward. As indicated by reference numeral 308, when the optical article 302 is rotated in a second direction about the first axis, this rotation can produce a second reflection effect, in which the reflection has an edge that moves upward while the center remains substantially stationary. For example, the left and right portions of the reflection can curve upward. As described above, FIGS. 3A-3D are presented merely as examples. Other embodiments are possible and can be different from those described with respect to FIGS. 3A-3D. In some embodiments, the optical article can be formed using a magnetic field generated by a set of magnets, and the shape of the magnetic field can be adjusted to achieve a desired reflection effect. When the optical article 302 is rotated in the second direction about the first axis, as shown, the reflection edge moves upward while the center remains substantially stationary. For example, the left and right portions of the reflection can curve upward. As can be seen from the figure, when the optical article 302 rotates about the first axis , the regions not occupied by the reflection band of the optical article 302 (e.g., , the triangular regions at the top and bottom centers of the optical article 302) remain dark.

[0027] As shown by reference numeral 310 in FIG. 3B, when the optical article 302 is rotated in the first direction about the second axis (e.g., a vertical axis and / or an axis perpendicular to the first axis), this rotation can produce a second reflection effect. Here, the second reflection effect brightens the left half portion (e.g., the first half) of the optical article 302 and darkens the right half portion (e.g., the second half) of the optical article 302. Similarly, as shown by reference numeral 312, when the optical article 30 2 is rotated in the second direction about the second axis, this second reflection effect is the brightening of the right

[0028] FIG. 3C shows an embodiment of a curve 314 that can be used to create the saddle-shaped rotation surfaces 316, 318. In some embodiments, this curve 314 can be a parabola (e.g., defined by the equation x = b· y + c (not shown in FIG. 3C for b and c)), or a hyperbola, and the saddle-shaped rotation surfaces 316, 318 can be paraboloids or fragments or hyperbolic paraboloids 2 as well. can be. can be.

[0029] FIG. 3D shows a magnetic field based on the saddle-shaped rotation surfaces 316, 318 for forming the optical article 302 Shows an example of a magnet configuration that can be used to generate The first configuration of the magnet can be provided in the same plane as the plane orthogonal to the plane 322 of the optical article 302. It can have a substantially triangular magnet. For example, in two substantially triangular magnets, the first Side 324 is provided parallel to the plane 322 and on the distal side from the plane 322, and the second side 326 in the two substantially triangular Magnets is in a plane orthogonal to the organic binder and can be provided in contact (or close proximity) with each other. As shown by reference numeral 328, The second configuration has a magnet with a triangular notch 330. In some embodiments, this The second configuration can use two triangular magnets that merge at the central point 334, And the rectangular portion 332 is distal from the central point 334. As described above, FIGS. 3A-3D are presented as mere examples. Other embodiments are possible,

[0030] And can be different from what has been described with respect to FIGS. 3A-3D. FIG. 4 is a flowchart of an exemplary process 400 for forming an optical article according to various embodiments described herein. One or more of the operations described in FIG. 4 can be performed by a system such as a system that can provide an organic binder containing reflective magnetic platelets, applying a magnetic field to the organic binder, and solidifying or curing the organic binder.

[0031] FIG. 4 is a flowchart of an exemplary process 400 for forming an optical article according to various embodiments described herein. One or more of the operations described in FIG. 4 can be performed by a system such as a system that can provide an organic binder containing reflective magnetic platelets, applying a magnetic field to the organic binder, and solidifying or curing the organic binder. Of the operations described in FIG. 4, one or more can be performed by a system such as a system that can provide an organic binder containing reflective magnetic platelets, applying a magnetic field to the organic binder, and solidifying or curing the organic binder. Of the operations described in FIG. 4, one or more can be performed by a system such as a system that can provide an organic binder containing reflective magnetic platelets, applying a magnetic field to the organic binder, and solidifying or curing the organic binder. Of the operations described in FIG. 4, one or more can be performed by a system such as a system that can provide an organic binder containing reflective magnetic platelets, applying a magnetic field to the organic binder, and solidifying or curing the organic binder. Can be.

[0032] As shown in FIG. 4, process 400 includes a step (block 410) of providing an organic binder containing a plurality of reflective magnetic platelets on a substrate. For example, the organic binder can be provided on the substrate. On the substrate. It is possible. The organic binder can be solidified or cured by a chemical reaction and is at least partially transparent ink or other substances. In some embodiments, the organic binder can be a highly reactive UV ink that cures using UV lamp technology for sheet-fed offset printers and web offset printers, such as, for example, UV curable ink (e.g., XCURA EVO by Flint Group, Ultraking 6100 FAST CURE by Flint Group, etc.). For example, the UV curable ink can include four components, namely, monomer (monomer), oligomer, pigment, and photoinitiator. The monomer can form the basic elements of the ink and also be involved in some properties such as the softness or hardness of the ink when cured, as well as the elongation properties of the ink for changing flexibility or application type. The oligomer in ink formulation includes a reactive resin for printing on a wide range of different substrates and a uniquely formulated adhesive component. The pigment imparts color. When the photoinitiator is exposed to UV light, it crosslinks or polymerizes the oligomer and monomer.

[0033] The organic binder can include a plurality of reflective magnetic platelets. These magnetic platelets can include substantially flat particles having dimensions in the range of about 10 μm × 10 μm × 0.5 μm to about 100 μm × 100 μm × 10 μm. These particles can include layers of different coordinates. One or more layers can be magnetized within the magnetic field of an external magnet or by an external magnet. In some cases, the reflective magnetic platelets are one of many security pigment particles. The reflective magnetic platelets can be made from a magnetically soft or hard material such as a ferromagnetic alloy. ​​​​​​​​​​​It can include the following layer. The central core can be coated with two or more aluminum layers as reflectors. The aluminum layer can be coated with a transparent material such as MgF2, SiO2, etc. A translucent chromium layer can be coated on the top surface of the transparent material. This special material is known as a security optically variable magnetic pigment (OVMP). The pigment can be mixed with the above-mentioned UV-curable organic binder to form a security optically variable magnetic ink (OVMI) used for printing anti-counterfeiting security elements on important documents.

[0034] In some embodiments, the substrate can be a document or can be attached to a document. In some embodiments, the organic binder and the small plates (and optionally the substrate) can be collectively referred to as an optical article.

[0035] Further, as shown in FIG. 4, process 400 includes a step of applying a magnetic field to the organic binder by using one or more magnets, the magnetic field being such that it aligns the plurality of reflective magnetic small plates to substantially coincide with at least a portion of the rotation surface (block 420). For example, a magnetic field is applied to the organic binder by using one or more magnets. In some embodiments, an electric field or an electromagnetic field can be used to generate a magnetic field to be applied to the organic binder to align the plurality of reflective magnetic small plates. For example, the electric field can have substantially the shape described for Examples 100, 200, and / or 300. The magnetic field can align the plurality of reflective magnetic small plates to substantially coincide with at least a portion of the rotation surface. For example, the magnetic field has the shape of at least a portion of the rotation surface. ​ can be substantially possessed. In some embodiments, the plurality of reflective magnetic platelets can be aligned such that when the substrate rotates about a first axis, a first reflection effect of the optical article is produced. Furthermore, the plurality of reflective magnetic platelets can be aligned such that when the substrate rotates about a second axis, a second reflection effect of the optical article is produced. The first reflection effect can be made different from the second reflection effect.

[0036] Furthermore, as shown in FIG. 4, the process 400 can include a step (block 430) of solidifying or curing an organic binder. For example, an organic binder (e.g., ink) can be solidified or cured. This can lock the reflective platelets in an alignment state with a magnetic field (electric field or electromagnetic field). In some embodiments, the organic binder can be solidified or cured using UV light or heat based on curing techniques and / or similar techniques.

[0037] The process 400 can include any single embodiment or any combination of embodiments as described below and / or additional embodiments related to one or more other processes described herein.

[0038] In some embodiments, the rotation surface is defined based on the natural logarithm. In some embodiments, the rotation surface has a substantially funnel-shaped configuration. In some embodiments, the rotation surface is defined based on a parabola or a hyperbola. In some embodiments, the rotation surface has a substantially hyperbolic paraboloid configuration. In some embodiments, the first axis is a horizontal axis and the second axis Take the vertical axis. In some embodiments, the first axis is perpendicular to the second axis.

[0039] In some embodiments, one or more magnets include two magnets provided parallel to each other, and the corners of the two magnets are cut off or rounded. In some embodiments, one or more magnets include two substantially triangular magnets provided in the same plane as each other. In some embodiments, the first side surface of the two substantially triangular magnets is parallel to the organic binder and distal from the organic binder, and the second side surfaces of the two substantially triangular magnets are provided perpendicular to the organic binder and in contact with each other. In some embodiments, one or more magnets include two or more magnets with triangular cutouts. In some embodiments, the first reflection effect is the magnification of the first part of the reflection from the optical article and the narrowing of the second part of the reflection from the optical article. In some embodiments, the second reflection effect is the first lateral movement of the first part of the reflection from the optical article, and this first lateral movement is greater than the second lateral movement of the second part of the reflection from the optical article. In some embodiments, the first reflection effect is the first movement of the left and right parts of the reflection from the optical article, and this first movement is greater than the second movement of the central part of the reflection from the optical article.

[0040] In some embodiments, the second reflection effect is the brightening in the first half of the reflection from the optical article and the darkening in the second half of the reflection from the optical article. In some embodiments, the second reflection effect is the brightening in the first half of the reflection from the optical article and the darkening in the second half of the reflection from the optical article. In some embodiments, the second reflection effect is the first lateral movement of the first part of the reflection from the optical article, and this first lateral movement is greater than the second lateral movement of the second part of the reflection from the optical article. This first lateral movement is greater than the second lateral movement of the second part of the reflection from the optical article.

[0041] In some embodiments, the first reflection effect is the first movement of the left and right parts of the reflection from the optical article, and this first movement is greater than the second movement of the central part of the reflection from the optical article. This first movement is greater than the second movement of the central part of the reflection from the optical article. In some embodiments, the second reflection effect is the brightening in the first half of the reflection from the optical article and the darkening in the second half of the reflection from the optical article. In some embodiments, the second reflection effect is the brightening in the first half of the reflection from the optical article and the darkening in the second half of the reflection from the optical article. In some embodiments, the second reflection effect is the brightening in the first half of the reflection from the optical article and the darkening in the second half of the reflection from the optical article.

[0042] Figure 4 shows an exemplary block of process 400. In some embodiments, the process Step 400 can include blocks in an additional block, fewer blocks, different blocks, or an array different from the array shown in FIG. 4. Additionally or alternatively, two or more of the blocks of process 400 can be performed in parallel. In this way, different reflection effects are produced when the optical article is rotated about different axes. This can improve the complexity of the optical article. In this way, the security of the document using this optical article is improved.

[0043]

[0044] The foregoing disclosure provides illustration and description, but is not intended to be exclusive or to limit the embodiments to the forms disclosed. Modifications and variations are possible in light of the above disclosure or may be learned from practice of the embodiments.

[0045] As used herein, the term "component" is intended to be broadly construed as hardware, firmware and / or a combination of hardware and software.

[0046] The systems and / or methods described herein can be implemented in different forms of hardware, firmware, or a combination of hardware and software. The actual dedicated control hardware or software code used to implement these systems and / or methods does not limit the embodiments. Accordingly, the operation and behavior of the systems and / or methods are those described herein without reference to specific software code, and software and hardware are based on the description herein for the systems and / or methods. It should be understood that it can be designed to achieve

[0047] Special combinations of features have been recited in the claims and / or disclosed herein, but these combinations are not intended to limit the disclosure of possible embodiments. In fact, many of these features can be combined in ways that are not recited in the claims and / or not disclosed herein. Each dependent claim recited in the claims directly depends on one claim, but the disclosure of possible embodiments includes each dependent claim in combination with all other claims in the claim set.

[0048] None of the elements, acts, or instructions used in this specification should be construed as strict or mandatory unless expressly stated otherwise. The articles "a" and "an" used in this specification are intended to include one or more items and can be used interchangeably with "one or more". Further, the term "set" used in this specification is intended to include one or more items (e.g., related items, unrelated items, combinations of related and unrelated items, etc.) and can be used interchangeably with "one or more". When intending only one item, the term "one" or similar language is used. Further, the terms "has", "have", "having" or similar terms used in this specification are intended to be terms without limitation. Further, the phrase "based on" is intended to mean "based, at least in part, on" unless otherwise expressly stated. ​

Claims

1. An optical article printed on a substrate, comprising a plurality of reflective magnetic plates wherein the plurality of reflective magnetic plates are arranged to exhibit a first reflection effect at a first viewing point, the first reflection effect including a saddle-shaped reflection effect, the plurality of reflective magnetic plates being configured to produce a second reflection effect at a second viewing point, the second viewing point being the viewing point when the optical article is rotated in a specific direction around an axis, the triangular regions at the top center and bottom center of the optical article being configured to remain dark when the optical article rotates around the axis, Optical article.

2. The optical article according to claim 1, wherein the saddle-shaped reflection effect includes presenting a saddle shape.

3. The optical article according to claim 1, wherein the first viewing point is a front view without rotating the optical article around an axis.

4. The optical article according to claim 1, wherein the second reflection effect includes a reflection in which the edge moves downward while the center of the reflection remains substantially stationary.

5. The optical article according to claim 4, wherein the reflection moving downward at the edge includes the left and right portions of the reflection that curve downward.

6. The optical article according to claim 4, wherein the second reflection effect further includes that when the optical article rotates around the axis in different directions, the center of the reflection remains substantially stationary while the edge moves upward.

7. The optical article according to claim 1, wherein the axis is a horizontal axis.

8. The optical article according to claim 1, wherein the plurality of reflective magnetic plates are configured to produce a third reflection effect at a third viewing point.

9. The optical article according to claim 8, wherein the third viewing point is the viewing point when the optical article is rotated around a different axis orthogonal to the axis.

10. The optical article according to claim 1, wherein the second reflection effect includes brightening a part of the optical article.

11. The optical article according to claim 10, wherein the second reflection effect further includes darkening different parts of the optical article.

12. An optical article printed on a substrate, comprising a plurality of reflective magnetic plates wherein the plurality of reflective magnetic plates are arranged to exhibit a first reflection effect at a first viewing point, the first reflection effect including a saddle-shaped reflection effect, The plurality of reflective magnetic small plates are configured to produce a second reflection effect at a second viewing point, The second viewing point is a viewing point when the optical article is rotated in a specific direction around an axis, The second reflection effect includes brightening a part of the optical article, The part of the optical article is half of the optical article. Optical article.

13. An optical article printed on a substrate, Comprising a plurality of reflective magnetic small plates The plurality of reflective magnetic small plates are aligned to exhibit a first reflection effect at a first viewing point, The first reflection effect includes a saddle-shaped reflection effect, The plurality of reflective magnetic small plates are configured to produce a second reflection effect at a second viewing point, The saddle-shaped reflection effect includes presenting a saddle-shaped surface using a curve that is a parabola or a hyperbola. Optical article.

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