CN106864161B - Security feature identification method and reflective security element film - Google Patents
Security feature identification method and reflective security element film Download PDFInfo
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- CN106864161B CN106864161B CN201710039586.6A CN201710039586A CN106864161B CN 106864161 B CN106864161 B CN 106864161B CN 201710039586 A CN201710039586 A CN 201710039586A CN 106864161 B CN106864161 B CN 106864161B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B44—DECORATIVE ARTS
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- B44F1/00—Designs or pictures characterised by special or unusual light effects
- B44F1/06—Designs or pictures characterised by special or unusual light effects produced by transmitted light, e.g. transparencies, imitations of glass paintings
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- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B44—DECORATIVE ARTS
- B44F—SPECIAL DESIGNS OR PICTURES
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Abstract
The invention discloses a safety characteristic identification method, which is realized on the basis of a reflection-type safety element film consisting of a focusing element array layer, a substrate layer, a micro-image-text array layer and a reflecting layer; the authenticity identification is realized through the light response generated by irradiating the reflective security element film by a point light source or a collimation light source; the invention also provides a reflection-type safety element film which has a more compact structure compared with other safety elements, can dynamically respond to illumination in real time, has response effect which cannot be realized by other safety elements and has higher anti-counterfeiting safety performance.
Description
Technical Field
The invention relates to the field of optical anti-counterfeiting, in particular to a security feature identification method and a reflection-type security element film, which can be used for anti-counterfeiting marks of important objects such as securities, certificates, cards and the like.
Background
Counterfeit commodities always bother the supervision department and the daily life of people, and how to obtain a safety element with higher anti-counterfeiting performance is a continuously pursued target in the field. The optical anti-counterfeiting product has obvious visual identification characteristics and is an important anti-counterfeiting technology. The holographic technology is a mainstream technology in the field of optical anti-counterfeiting, has good anti-counterfeiting effect and is widely applied. However, as the technology develops and matures, holographic products are increasingly applied to the fields of packaging, decoration and the like, and the anti-counterfeiting property of the holographic products is gradually weakened.
The recently developed micro-optical array system based on the moire magnification principle has obvious visual effect and good anti-counterfeiting performance. U.S. Pat. No.4,892,336 discloses a security thread formed by the overlapping mating of a lenticular array and a striped microimage array. Drinkwater et al, in U.S. patent No.5,712,731, disclose a transmissive micro-optical system in which a spherical lens array and a micro-image-text array are matched to each other. Chinese patent 200680048634.8 extends the arrangement symmetry of microlens arrays and micro-image-text arrays in security elements, proposes an arrangement based on two-dimensional bravais lattice, and further enhances the security performance of the elements by using the arrangement structure. Chinese patent CN201010180251.4 further reduces the symmetry of the array and discloses a transmissive security element consisting of a randomly arranged array structure. R.a. steenblik et al in U.S. patent No. us.s.pat. No.2005/0180020 a1 and subsequent patent No. us.s.pat. No.2008/0037131 a1 expand the parameter range of the above-mentioned micro-optical system, reduce the aperture (less than 50um) and focal length of the lens, make the thickness of the system less than 50um, form a thin-film type safety element, thereby expanding the application range thereof. This patent also discloses reflective micro-optical systems that place the microimages at the focal plane of the microlens array to form the display features.
Reflective micro-optical array systems have a more compact structure than transmissive systems, and the security elements can be made thinner and easier to integrate. However, the above systems are based on the principle of moire magnification imaging, and the microimage-text arrays are arranged at the focal length of the reflective micro-optical array. This structure suffers from two disadvantages: 1) the structure thickness is still limited by the focal length of the micro-optical array, and cannot be further thinned. 2) The security element cannot respond dynamically to changes in illumination. Thereby restricting the application range and the safety performance of the device.
Disclosure of Invention
Accordingly, the present invention is directed to overcoming the disadvantages of the prior art and providing a method for authenticating a security feature and a reflective security element film.
The purpose of the invention is realized by the following technical scheme: a security feature identification method is realized based on a reflection-type security element film composed of a focusing element array layer, a substrate layer, a micro-image-text array layer and a reflection layer; the authenticity identification is realized through the light response generated by irradiating the reflective security element film by a point light source or a collimation light source; the optical response includes:
under the action of the point light source, the response form generated by the safety element film comprises: when the point light source is started, the characteristic image or partial characteristic image displayed by the safety element film is displayed; when the point light source is closed, the characteristic image or part of the characteristic image displayed by the safety element film disappears; the point light source is a divergent point light source or a convergent point light source.
Under the action of a collimated light source, the response form generated by the safety element film comprises: when the collimated light illumination is turned on, the characteristic image or partial characteristic image displayed by the safety element film is displayed; when the collimated light illumination is turned off, the characteristic image or part of the characteristic image displayed by the security element film will disappear.
Further, the responding further comprises: when the point light source moves along the normal direction of the plane of the safety element film, the transverse size and the longitudinal depth position of the characteristic image or the partial characteristic image displayed by the safety element film change correspondingly, or the characteristic image or the partial characteristic image displayed by the safety element film rotates around the normal direction of the plane of the image; when the point light source moves along the direction parallel to the plane of the safety element film, the position of the characteristic image or part of the characteristic image displayed by the safety element film moves along the plane parallel to the safety element film, and the moving direction of the characteristic image is the same as or opposite to that of the light source.
Further, the responding further comprises: when the illumination direction of the collimated light is changed, the position of the characteristic image or part of the characteristic image displayed by the safety element film moves along a plane parallel to the safety element film, and the moving direction of the characteristic image is the same as or opposite to the change direction of the illumination direction.
The invention also provides a reflective security element film, which comprises a focusing element array layer, a substrate layer, a reflecting layer and a micro-image-text array layer; the micro image-text array layer is formed by arranging micro image-text units; the focusing element array layer is formed by arranging focusing element units; at least part of the microimage-text unit is not in the focal depth range of the focusing element unit; under the illumination of a point light source or collimated light, the micro image-text unit is magnified and imaged through the corresponding focusing unit and the corresponding reflecting layer; the magnified images of the micro-image-text units are mutually superposed, and the characteristic image is formed through comprehensive imaging.
Further, at least part of the microimage-text unit is located within one focal length of the focusing element array layer, preferably within 0.5 focal length.
Further, at least part of the microimage-text unit is located outside a focal length of the focusing element array layer, preferably between 1 and 3 focal lengths.
Further, in the focusing element unit array layer, an arrangement manner of the focusing element units includes: orthogonal arrangements with axes of symmetry, honeycomb arrangements, low symmetry arrangements without axes of symmetry, random arrangements, or the like. The arrangement mode of the micro image-text units is the same as that of the focusing units.
Further, the focusing element unit may employ various micro optical elements having a focusing function, such as a cylindrical micro lens, a spherical lens, an aspherical lens, a fresnel lens, and the like. The aperture of the focusing element unit can be in various geometric shapes such as circle, square, rectangle, triangle, hexagon, polygon and the like.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:
1. compared with other safety elements, the reflection-type safety element film disclosed by the invention has the advantages of more compact structure, thinner overall thickness, easier integration and wider application range.
2. The reflective security element film disclosed by the invention has higher image contrast compared with other security elements.
3. The reflective safety element disclosed by the invention can dynamically respond to illumination in real time, has response effect which cannot be realized by other safety elements, and has higher anti-counterfeiting safety performance.
4. The depth of the microstructure in the reflective security element disclosed herein is shallower relative to the depth of the structure of other security elements. Is beneficial to reducing the processing difficulty and the manufacturing cost.
Drawings
FIGS. 1 and 2 are schematic views of a reflective security element film under illumination by a point source and a non-point source, respectively, according to one embodiment;
FIG. 3 is a schematic view of the light response of one embodiment of the reflective security element film with the point light source moved;
FIGS. 4 and 5 are schematic views of a reflective security element film according to a second embodiment under illumination with a point light source and without a point light source, respectively;
fig. 6 is a schematic view showing the light response of the reflective security element film of the second embodiment when it is moved;
FIGS. 7 and 8 are schematic views of a reflective security element film according to a third embodiment under illumination with a point light source and without a point light source, respectively;
FIGS. 9 and 10 are schematic diagrams of a film of the reflective security element of the fourth embodiment under illumination with a point source and without a point source, respectively;
FIGS. 11 and 12 are schematic diagrams of a film of the reflective security element of example five under illumination with a point source and a non-point source, respectively;
FIGS. 13 and 14 are schematic views of a reflective security element film according to example six under illumination with a point source and without a point source, respectively;
fig. 15 and 16 are schematic diagrams each showing the light response of the reflective security element film of example six when the point light source is moved;
fig. 17 is a schematic diagram showing the photoresponse of the reflective security element film of example four under collimated light movement;
FIGS. 18 and 19 are schematic views of a reflective security element film according to the seventh embodiment under illumination with a point light source and without a point light source, respectively;
FIG. 20 is a schematic view of the light response of the reflective security element film of example seven as the point light source is moved;
FIG. 21 is a schematic view of the light response of the reflective security element film of example seven as the point light source is moved;
FIGS. 22 and 23 are views showing a reflective security element film of example eighthly under illumination with a point source of light and no point source of light;
FIGS. 24 and 25 are schematic illustrations of a reflective security element film according to example nine under illumination with a point source of light and without a point source of light;
FIG. 26 is a schematic view of the light response of the reflective security element film of example nine as the point light source is moved;
FIGS. 27 and 28 are schematic illustrations of a reflective security element film according to a tenth embodiment under illumination with a point source of light and without a point source of light;
FIG. 29 is a schematic view of the light response of a reflective security element film of the tenth embodiment when the point light source is moved;
in the figure, a focusing element array layer 1, a substrate layer 2, a micro-pattern array layer 3 and a reflection layer 4.
Detailed Description
The invention discloses a security feature identification method, which realizes authenticity identification based on special light response generated by a reflective security element film under the irradiation of a point light source or a collimated light source.
The optical response includes:
under the action of the point light source, the response form generated by the safety element film comprises: when the point light source is started, the characteristic image or partial characteristic image displayed by the safety element film is displayed; when the point light source is closed, the characteristic image or part of the characteristic image displayed by the safety element film disappears; the point light source is a divergent point light source or a convergent point light source.
Under the action of a collimated light source, the response form generated by the safety element film comprises: when the collimated light illumination is turned on, the characteristic image or partial characteristic image displayed by the safety element film is displayed; when the collimated light illumination is turned off, the characteristic image or part of the characteristic image displayed by the security element film will disappear.
Based on the special response form, the invention also provides a reflection-type security element film, which comprises a focusing element array layer 1, a substrate layer 2, a reflection layer 4 and a micro-image-text array layer 3; the micro image-text array layer 3 is formed by arranging micro image-text units, and the specific construction form comprises: micro-graphics and texts (micro-graphics and text units) are arranged on the transparent substrate so as to form a micro-graphics and text array layer 3, or each micro-graphics and text unit is mutually independent and is arranged orderly or disorderly to form the micro-graphics and text array layer 3; the focusing element array layer 1 is formed by arranging focusing element units; at least part of the microimage-text unit is not in the focal depth range of the focusing element unit; under the illumination of a point light source or collimated light, the micro image-text unit is magnified and imaged through the corresponding focusing unit and the reflecting layer 4; the magnified images of the micro-image-text units are mutually superposed to form a characteristic image through comprehensive imaging.
When the symmetry axis of the focusing element array is parallel to the symmetry axis of the micro-image-text unit array, or the coordinate axis of the focusing element array is parallel to the coordinate axis of the micro-image-text unit array, if the point light source moves along the normal direction of the plane where the safety element film is located, the transverse size and the longitudinal depth position of the characteristic image or part of the characteristic image displayed by the safety element film are correspondingly changed.
When the symmetry axis of the focusing element array is not parallel to the symmetry axis of the micro-image-text unit array, or the coordinate axis of the focusing element array is not parallel to the coordinate axis of the micro-image-text unit array, if the point light source moves along the normal direction of the plane where the safety element film is located, the characteristic image or part of the characteristic image displayed by the safety element film rotates around the normal direction of the plane where the image is located.
When the micro-image-text unit is within one-time focal distance of the focusing element unit, the characteristic image or part of the characteristic image displayed by the safety element film is suspended below the safety element film, and when the point light source moves along the direction parallel to the plane of the safety element film, the position moves along the plane parallel to the safety element film, and the moving direction of the characteristic image is the same as the moving direction of the light source; or the characteristic image or part of the characteristic image displayed by the safety element film is suspended on the safety element film, when the point light source moves along the direction parallel to the plane of the safety element film, the position moves along the plane parallel to the safety element film, and the moving direction of the characteristic image is opposite to the moving direction of the light source.
When the micro-image-text unit is beyond one-time focal length of the focusing element unit, the characteristic image or part of the characteristic image displayed by the safety element film is suspended below the safety element film, and the point light source moves along the direction parallel to the plane of the safety element film, the position of the characteristic image or part of the characteristic image displayed by the safety element film moves along the plane parallel to the safety element film, and the moving direction of the characteristic image is opposite to the moving direction of the light source; or the characteristic image or part of the characteristic image displayed by the safety element film is suspended on the safety element film, when the point light source moves along the direction parallel to the plane of the safety element film, the position of the characteristic image or part of the characteristic image displayed by the safety element film moves along the plane parallel to the safety element film, and the moving direction of the characteristic image is the same as the moving direction of the light source.
The display effect of the characteristic image includes a three-dimensional stereoscopic effect and a dynamic image effect. The three-dimensional stereoscopic effect comprises: the image is suspended over the security element film; the image is suspended below the security element film; the three-dimensional image spans the three-dimensional space above and below the security element film. The dynamic image effect includes an orthogonal parallax shift effect and a parallel parallax shift effect.
The invention is further described with reference to the following examples and figures.
Example one
The embodiment provides a reflective security element film and a security mark identification method thereof, as shown in fig. 1 and 2, the reflective security element film comprises a focusing element array layer 1, a substrate layer 2, a reflecting layer 4 and a micro-pattern array layer 3, wherein the focusing element array layer 1, the substrate layer 2 and the reflecting layer 4 are sequentially bonded, and the micro-pattern array layer 3 is obtained by arranging micro-patterns (micro-pattern units) on a transparent substrate. The focusing element array layer 1 is formed by orthogonally arranging spherical lens units, and the array period is T. The micro graphic and text units are arranged orthogonally, and the array period is 1.005T. The symmetry axis of the focusing element array and the symmetry axis of the micro-graphic and text unit array are parallel to each other. The microimage-text unit is located at 0.2 times the focal length of the focusing element array.
Under the illumination of a point light source, light rays are superposed above the focusing array layer through the comprehensive amplification imaging effect among the array units to form a suspended image S which can be received by an observer, as shown in FIG. 1.
As shown in fig. 2, under the illumination of the non-point light source, the security element cannot form a floating image S, and its characteristic information is hidden.
As shown in fig. 3, when the point source is moved clockwise in a direction parallel to the plane of the security element as indicated by the arrow, the viewer sees that the image S will move clockwise in the direction of the arrow along the plane of the security element, the size of the image S remaining unchanged during the movement.
Example two
The embodiment provides a reflective security element film and a security mark identification method thereof, as shown in fig. 4 and 5, the reflective security element film comprises a focusing element array layer 1, a substrate layer 2, a reflective layer 4 and a micro-image-text array layer 3, wherein the focusing element array layer 1, the substrate layer 2 and the reflective layer 4 are sequentially bonded, and the micro-image-text unit is embedded in the substrate layer 2 to form the micro-image-text array layer 3. The focusing element array layer 1 is formed by orthogonally arranging spherical lens units, and the array period is T. The micro-image-text units are arranged orthogonally, and the array period is 0.995T. The symmetry axis of the focusing element array and the symmetry axis of the micro-graphic and text unit array are parallel to each other. The microimage-text unit is located at 0.1 times the focal length of the focusing element array.
Under the illumination of the point light source, as shown in fig. 4, the light rays form a floating image S which can be received by an observer below the focusing array layer through the comprehensive amplification imaging effect among the array units.
As shown in fig. 6, the security element is rotated about a horizontal axis in the direction of the arrow, and the viewer sees that the image S will move in a direction parallel to the direction of rotation.
As shown in fig. 5, under the illumination of the non-point light source, the security element cannot form a floating image S, and its characteristic information is hidden.
EXAMPLE III
The present embodiment provides a reflective security element film, as shown in fig. 7 and 8, which includes a focusing element array layer 1, a substrate layer 2, a reflective layer 4, and a micro pattern-text array layer 3, where the reflective layer 4, the focusing element array layer 1, and the substrate layer 2 are sequentially bonded, and the micro pattern-text unit is embedded in the substrate layer 2 to form the micro pattern-text array layer 3. The focusing element array layer 1 is formed by orthogonally arranging spherical lens units, and the array period is T. The micro graphic and text units are arranged orthogonally, and the array period is 1.003T. The symmetry axis of the focusing element array and the symmetry axis of the micro-graphic and text unit array are parallel to each other. The microimage-text unit is located at 0.2 times the focal length of the focusing element array.
As shown in fig. 7, under the illumination of the point light source, the light rays form a floating image S that can be received by the viewer above the focusing array layer through the combined magnifying imaging effect between the array units. As shown in fig. 8, under the illumination of the non-point light source, the security element cannot form a floating image, and the characteristic information thereof is hidden.
Example four
The present embodiment provides a reflective security element film, as shown in fig. 9 and 10, which includes a focusing element array layer 1, a substrate layer 2, a reflective layer 4, and a micro pattern-text array layer 3, wherein the reflective layer 4, the focusing element array layer 1, and the substrate layer 2 are sequentially bonded, and the micro pattern-text unit is embedded in the substrate layer 2 to form the micro pattern-text array layer 3. The focusing element array layer 1 is formed by arranging aspheric lens units in a honeycomb manner, and the distance between the centers of the adjacent aspheric lens units is T micrometers. The micro-image-text units are arranged in a honeycomb shape, and the distance between the centers of the adjacent micro-image-text units is 1.005T micrometers. The symmetry axis of the focusing element array and the symmetry axis of the micro-graphic and text unit array are parallel to each other. The microimage-text unit is located at 0.1 times the focal length of the focusing element array.
As shown in fig. 9, under illumination by a point source of light, a suspended image S is formed above the focusing array layer that can be received by a viewer 10. As shown in fig. 10, under the illumination of the pointless light source, the security element cannot form a floating image, and its characteristic information is hidden.
EXAMPLE five
This embodiment provides a reflective security element film, as shown in fig. 11 and 12, including a focusing element array layer 1, a substrate layer 2, a reflective layer 4, and a micro-pattern array layer 3, the reflective layer 4, the focusing element array layer 1, and the substrate layer 2 being bonded in this order. The micro image-text unit comprises a first micro image-text unit and a second micro image-text unit which are embedded in the substrate layer 2 to respectively form a first micro image-text array layer 31 and a second micro image-text array layer 32; the focusing element array layer 1 is formed by arranging aspheric lens units in a honeycomb manner, and the distance between the centers of the adjacent aspheric lens units is T micrometers. The first micro image-text unit and the second micro image-text unit are respectively formed by honeycomb arrangement, and the distance between the centers of the adjacent micro image-text units is 1.005T micrometers. The symmetry axis of the focusing element array and the symmetry axis of the micro-graphic and text unit array are parallel to each other. The first microimage-text unit is positioned at one focal length of the focusing element array. The second microimage-text unit is positioned at 0.1 times the focal length of the focusing element array.
As shown in fig. 11, the security element, under illumination by a point source of light, forms a suspended image S and a suspended image S1 that can be received by a viewer over the focusing array layer. As shown in fig. 12, under the illumination of the pointless light source, the security element only displays the floating image S1, but cannot display the floating image S, and the characteristic information thereof is hidden.
EXAMPLE six
The present embodiment provides a reflective security element film, as shown in fig. 13 and 14, which includes a focusing element array layer 1, a substrate layer 2, a reflective layer 4, and a micro pattern array layer 3, wherein the focusing element array layer 1, the reflective layer 4, and the substrate layer 2 are sequentially bonded, and the micro pattern unit is embedded in the reflective layer 4 to form the micro pattern array layer 3. The focusing element array layer 1 is formed by orthogonally arranging spherical lens units 5, and the array period is T microns. The micro graphic and text units are arranged orthogonally, and the array period is 0.998T microns. The symmetry axis of the focusing element array and the symmetry axis of the array formed by the micro-graphic and text units are parallel to each other. The layer 3 of the microimage-text array is located at 0.1 times the focal length of the array of focusing elements.
As shown in fig. 13, under illumination by a point source of light, a suspended image S is formed beneath the focusing array layer that can be received by an observer. As shown in fig. 14, under the illumination of the non-point light source, the security element cannot form a floating image, and the characteristic information thereof is hidden. As shown in fig. 15, when the point light source moves up and down along the normal direction of the security element, the moving direction is shown by an arrow, and the observer can see that the image S will move up and down along the normal direction of the security element, and the size of the image S will change correspondingly during the moving process. As shown in fig. 16, when the point light source 8 moves left and right along the plane direction of the security element, the moving direction is shown by an arrow, and the observer can see that the image S will move left and right along the plane direction of the security element, and the size of the image S remains unchanged during the moving process. As shown in fig. 17, when the direction of illumination of the collimated light changes as indicated by the arrow, the viewer can see that the image S will move left and right along the plane of the security element in the direction of the arrow, the size of the image S remaining unchanged during the movement.
EXAMPLE seven
The present embodiment provides a reflective security element film, as shown in fig. 18 and 19, which includes a focusing element array layer 1, a substrate layer 2, a reflective layer 4, and a micro pattern-text array layer 3, where the focusing element array layer 1, the reflective layer 4, and the substrate layer 2 are sequentially bonded, and the micro pattern-text unit is embedded in the reflective layer 4 to form the micro pattern-text array layer 3; the focusing element array layer 1 is formed by orthogonally arranging spherical lens units 5, and the array period is T microns. The micro graphic and text units are arranged orthogonally, and the array period is T microns. And an included angle between the symmetry axis of the focusing element array and the symmetry axis of the micro image-text unit array is 5 degrees. The layer 3 of the microimage-text array is located at 0.1 times the focal length of the array of focusing elements.
As shown in figure 18, under illumination by a point source of light, a suspended dynamic image S is formed beneath the focusing array layer, which can be received by an observer, the dynamic image S lying in the plane of the security element. As shown in fig. 21, when the point light source is moved in a direction perpendicular to the plane of the security element as indicated by the arrow, the viewer can see that the image S will be rotated in the direction indicated by the arrow around the normal to the security element. As shown in fig. 20, the security element is rotated in a direction about a horizontal axis, and the viewer sees that the image S will move in a direction orthogonal to the direction of rotation. As shown in fig. 19, under the illumination of the non-point light source, the security element cannot form a floating image, and the characteristic information thereof is hidden.
Example eight
The present embodiment provides a reflective security element film, as shown in fig. 22 and 23, which includes a focusing element array layer 1, a substrate layer 2, a reflective layer 4, and a micro pattern array layer 3, wherein the focusing element array layer 1, the substrate layer 2, and the reflective layer 4 are sequentially bonded, and the micro pattern unit is embedded in the reflective layer 4 to form the micro pattern array layer 3. The focusing element array layer 1 is formed by randomly arranging spherical lens units. The micro image-text units are randomly arranged in the same arrangement mode as the spherical lens. The size of the array of focusing elements is 1.005 times the size of the array of microimage and text elements. The layer 3 of the microimage-text array is located at 0.3 times the focal length of the array of focusing elements.
As shown in fig. 22, under the illumination of the converging point light sources, a floating image S that can be received by the viewer is formed in the three-dimensional space below and above the security element and in the plane of the security element. As shown in fig. 23, under the illumination of the non-point light source, the security element cannot form a floating image, and the characteristic information thereof is hidden.
Example nine
The present embodiment provides a reflective security element film, as shown in fig. 24 and 25, which includes a focusing element array layer 1, a substrate layer 2, a reflective layer 4, and a micro pattern-text array layer 3, wherein the reflective layer 4, the focusing element array layer 1, and the substrate layer 2 are sequentially bonded, and the micro pattern-text unit is embedded in the substrate layer 2 to form the micro pattern-text array layer 3. The focusing element array layer 1 is formed by arranging aspheric lens units in a honeycomb manner, and the distance between the centers of the adjacent aspheric lens units is T micrometers. The micro-image-text units are arranged in a honeycomb manner, and the distance between the centers of the adjacent micro-image-text units is 1.003T micrometers. The symmetry axis of the focusing element array and the symmetry axis of the micro-graphic and text unit array are parallel to each other. The layer 3 of the microimage-text array is located at 1.2 times the focal length of the array of focusing elements.
As shown in fig. 24, under illumination by a point source of light, a suspended image S is formed above the focusing array layer that can be received by the viewer 10. As shown in fig. 26, when the point source is moved clockwise parallel to the plane of the security element as indicated by the arrow, the viewer sees that the image S will move clockwise in the direction of the arrow along the plane of the security element, the size of the image S remaining unchanged during the movement. As shown in fig. 25, under the illumination of the non-point light source, the security element cannot form a floating image, and the characteristic information thereof is hidden.
Example ten
This embodiment provides a reflective security element film, as shown in fig. 27 to 28, including a focusing element array layer 1, a substrate layer 2, a reflective layer 4, and a micro pattern array layer 3, wherein the reflective layer 4, the focusing element array layer 1, and the substrate layer 2 are bonded in this order. The micro image-text unit comprises a first micro image-text unit and a second micro image-text unit which are embedded in the substrate layer 2 to respectively form a first micro image-text array layer 31 and a second micro image-text array layer 32; the focusing element array layer 1 is formed by arranging aspheric lens units in a honeycomb manner, the distance between the centers of the adjacent aspheric lens units is T micrometers, the first micro image-text unit and the second micro image-text unit are arranged in a honeycomb manner, and the distance between the centers of the adjacent micro image-text units is 1.003T micrometers. The symmetry axis of the focusing element array and the symmetry axis of the micro-graphic and text unit array are parallel to each other. The first microimage-text unit is positioned at 1.5 times the focal length of the focusing element array. The second microimage-text unit is positioned at 0.1 times the focal length of the focusing element array.
The security element, under illumination by the point source, forms a floating image S and a floating image S1 that can be received by an observer. As shown in fig. 29, when the point source of light is moved in a direction parallel to the plane of the security element as indicated by the arrow, the viewer will see that image S1 will move in the direction indicated by the arrow and the viewer will see that image S will move in the direction indicated by the arrow. Under the illumination of the pointless light source, the floating image S and the floating image S1 can not be displayed by the safety element, and the characteristic information is hidden.
Claims (8)
1. A security feature identification method is characterized in that the method is realized based on a reflection-type security element film consisting of a focusing element array layer, a substrate layer, a micro-image-text array layer and a reflection layer; the micro image-text array layer is formed by arranging micro image-text units; the focusing element array layer is formed by arranging focusing element units; at least part of the microimage-text unit is not in the focal depth range of the focusing element unit; the authenticity identification is realized through the light response generated by irradiating the reflective security element film by a point light source or a collimation light source; the optical response includes:
under the action of the point light source, the response form generated by the safety element film comprises: when the point light source is started, the characteristic image or partial characteristic image displayed by the safety element film is displayed; when the point light source is closed, the characteristic image or part of the characteristic image displayed by the safety element film disappears; the point light source is a divergent point light source or a convergent point light source;
under the action of a collimated light source, the response form generated by the safety element film comprises: when the collimated light illumination is turned on, the characteristic image or partial characteristic image displayed by the safety element film is displayed; when the collimated light illumination is turned off, the characteristic image or part of the characteristic image displayed by the security element film will disappear.
2. The method of claim 1, wherein responding further comprises: when the point light source moves along the normal direction of the plane of the safety element film, the transverse size and the longitudinal depth position of the characteristic image or the partial characteristic image displayed by the safety element film change correspondingly, or the characteristic image or the partial characteristic image displayed by the safety element film rotates around the normal direction of the plane of the image; when the point light source moves along the direction parallel to the plane of the safety element film, the position of the characteristic image or part of the characteristic image displayed by the safety element film moves along the plane parallel to the safety element film, and the moving direction of the characteristic image is the same as or opposite to that of the light source.
3. The method of claim 1, wherein responding further comprises: when the illumination direction of the collimated light is changed, the position of the characteristic image or part of the characteristic image displayed by the safety element film moves along a plane parallel to the safety element film, and the moving direction of the characteristic image is the same as or opposite to the change direction of the illumination direction.
4. A reflective security element film, characterized in that it comprises a focusing element array layer (1), a substrate layer (2), a reflective layer (4) and a micro-pattern array layer (3); the micro image-text array layer (3) is formed by arranging micro image-text units; the focusing element array layer (1) is formed by arranging focusing element units; at least part of the microimage-text unit is not in the focal depth range of the focusing element unit; under the illumination of a point light source or collimated light, the micro image-text unit is magnified and imaged through the corresponding focusing unit and the reflecting layer (4); the magnified images of the micro-image-text units are mutually superposed, and the characteristic image is formed through comprehensive imaging.
5. Reflective security element film according to claim 4, wherein at least part of the microimage-text units are located within one focal length of the focusing element array layer (1).
6. Reflective security element film according to claim 4, wherein at least part of the microimage-text units are located outside one focal length of the focusing element array layer (1).
7. A reflective security element film according to claim 4, wherein said focusing element unit array layer (1) has focusing element units arranged in a manner comprising: orthogonal arrangement with symmetry axis, honeycomb arrangement, low symmetry arrangement without symmetry axis or random arrangement; the arrangement mode of the micro image-text units is the same as that of the focusing units.
8. A reflective security element film according to claim 4, wherein said focusing element unit may employ a cylindrical microlens, a spherical lens, an aspherical lens, a fresnel lens; the aperture of the focusing element unit can be circular, square, rectangular, triangular or hexagonal.
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| CN109613638A (en) * | 2017-10-04 | 2019-04-12 | 吴东辉 | Orient flash light-reflection product |
| CN109808337B (en) * | 2017-11-21 | 2021-08-17 | 中钞特种防伪科技有限公司 | Optical anti-counterfeiting element and optical anti-counterfeiting product |
| CN108254938B (en) * | 2018-01-23 | 2020-11-06 | 浙江理工大学 | Double imaging method and system of Fourier transform array and application thereof |
| CN108398735B (en) * | 2018-02-09 | 2020-11-03 | 浙江理工大学 | Directional imaging device, method and application |
| CN109870821A (en) * | 2019-04-03 | 2019-06-11 | 冯煜 | A kind of focusing structure and the method for realizing naked eye 3D display |
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