54 results about "Optical security" patented technology

This invention relates to a thin-film device for optical anti-counterfeiting, belonging to the field of anti-counterfeiting thin-film device design. The device includes a substrate layer; a plurality of micro-cylindrical reflective units, each cylindrical with its bottom surface adhered to the substrate layer; a ring-shaped textured area, also ring-shaped, disposed on the surface of the substrate layer and adhered to the side of the micro-cylindrical reflective units, the ring-shaped textured area being filled with a distorted texture corresponding to the source image to be displayed; and a reflective functional layer disposed on the side of the micro-cylindrical reflective units and in the area of ​​the non-ring-shaped textured area on the surface of the substrate layer, to achieve a specular reflection effect. The thin-film device constructed by this invention miniaturizes the macroscopic "cylindrical specular reflection imaging" system, achieving highly concealed information hiding and display on the thin-film device itself—"without the need for an external cylindrical mirror, the thin-film device itself is both a mirror and an image source"—within which information can be hidden and displayed with high concealment.

The invention relates to an optical security element (12) for protecting articles of value, comprising at least two effect regions (14, 16) for producing different optical effects, said effect regions adjoining one another along a boundary line (18). According to the invention, the effect regions (14, 16) are each formed by a plurality of pixels (34; according to the invention, the first effect region (14) and the second effect region (16) consist of pixels (34, 36), and a dithered transition region (20) is formed along a boundary line between the first effect region (14) and the second effect region (16), in which transition region the area fraction of the pixels (34) of the first effect region (14) gradually decreases from 100% to 0% and the area fraction of the pixels (36) of the second effect region (16) gradually increases from 0% to 100%, the transition region is arranged so that the optical effect of the first effect region is smoothly transitioned into the optical effect of the second effect region in the transition region during observation. At least one of the two effect regions may be formed by a micromirror region having a directional reflective micromirror.

This invention relates to the field of optical anti-counterfeiting technology and discloses an optical anti-counterfeiting element, including at least one focusing unit. The focusing unit includes a substrate, a focusing element, and an image layer. The substrate includes a first surface and a second surface disposed opposite to each other; the focusing element is disposed on the second surface; the image layer is disposed on the first surface. The central portion of the focusing unit, when projected onto the image layer, forms a first region, and the remaining portion of the focusing unit, when projected onto the image layer, forms a second region. The second region is disposed around the first region. On the image layer, the area outside the projection range of the focusing unit onto the image layer is a third region, which is disposed around the second region. The first region is provided with micro-graphic strokes, and the second and third regions are also provided with supplementary graphic strokes. The sum of the areas of the micro-graphic strokes and supplementary graphic strokes within a focusing unit is a preset area value, reducing the unevenness of the background color of the optical anti-counterfeiting element.

The invention discloses a bionic circular dichroism optical encryption device based on a tiger structure, and the device comprises a first substrate, a first conductive layer, a first electrode patch, an information encryption layer, a second conductive layer, a second electrode patch, and a second substrate. Wherein the information encryption layer adopts a double-layer Z-shaped structure design to simulate a tiger function, an upper layer fixing structure corresponds to a left half tiger of a palm tube, and a lower layer dynamic rotating structure corresponds to a right half tiger held by a user. A ciphertext transmission system is constructed by regulating and controlling three key parameters of an inclination angle, a rotation angle and an electromagnetic wave incidence angle of the lower layer structure, and steganography information can be accurately decrypted by using a specific CD key only when the three key parameters meet preset matching conditions at the same time. According to the invention, the dynamic adjustable circular dichroism (CD) is innovatively realized, and an optical security system for information encryption is constructed through the bionic design of key matching.

The embodiment of the invention provides an optical power adjusting method and related equipment, which can reduce the NF (Network Function) of an optical amplifier under the condition that an OSA (Optical Security Association) cannot be additionally arranged, thereby optimizing the OSNR (Optical Signal to Noise Ratio) of an optical transmission link. The method is applied to an optical amplifier, and comprises the following steps: a first amplification module amplifies the optical power of a first optical signal to obtain an amplified first optical signal; the first DGFF attenuates the optical power of the N first wavelengths included in the second optical signal according to the N first optical attenuation values to obtain an attenuated second optical signal, and the second optical signal comprises the amplified first optical signal; the first optical splitter splits the third optical signal to obtain a first sub-optical signal and a second sub-optical signal; the first photoelectric detector performs photoelectric conversion on the first sub-optical signal to obtain a first electric signal; and the controller obtains second control information according to the first electric signal, wherein the second control information comprises a mapping relation between each first wavelength and one second light attenuation value in the N second light attenuation values.

An article including a substrate; and a composition on the substrate, the composition including a liquid medium, and a semi-transparent magnetic pigment including a semi-transparent, metallic, magnetic material and a dielectric material used as a light interference cavity is disclosed, A method of making the article is also disclosed.

An assembly including a first magnet; a substrate positioned above the first magnet, and having a surface for receiving a composition including a plurality of magnetizable platelets; and a second magnet, positioned above the substrate is disclosed. The assembly can be used in a method of making an optical security element. The optical security element and the method of making the optical security element are also disclosed.

The present invention relates to an optical security device (1) comprising a metallization layer (4) having an optically active microstructure defining an active observation condition and an inactive observation condition for an observer, wherein the metallization layer (4) comprises a micro-patterned mesh of metallized sections (6) and de-metallized sections (5), wherein said metallized sections (6) provide a first optical feature. The optical security device (1) further comprises an underlying layer (3) providing a second optical feature, wherein the mesh constant of the micro-patterned mesh is smaller than 200 micrometres, so that (i) under the active observation condition said micro-patterned mesh makes at least the first optical feature provided by the metallized sections (6) of the metallization layer (4) perceivable by the observer and under the inactive observation condition said micro-patterned mesh makes at least the second optical feature provided by the underlying layer (3) perceivable by the observer.

An optical security element may be printed on a substrate. The optical security element may include a plurality of bifunctional pigment flakes provided in a binder. A bifunctional pigment flake in the plurality of bifunctional pigment flakes may comprise a first surface having a diffraction grating relief with a first modulation, and a second surface having a second modulation that is smaller than the first modulation. The plurality of bifunctional pigment flakes are arranged such that, in a presence of incident light, diffraction colors are exhibited by a first subset of the plurality of bifunctional pigment flakes that are in a first region of the optical security element, and an interference color is exhibited by a second subset of the plurality of bifunctional pigment flakes that are in a second region of the optical security element.

The invention relates to a ghost imaging neural differential analysis method under a selected plaintext attack condition in the technical field of computational imaging and optical security. The method comprises the following steps: firstly, designing a differentiated plaintext, and deducing a projection speckle by adopting differential calculation; then, constructing a dimensionality reduction simulation training set and an experimental test set based on the structural features of the projection speckles; then, constructing a one-dimensional signal noise reduction neural network model, and training the one-dimensional signal noise reduction neural network model by adopting the dimension reduction simulation training set; and finally, inputting the experimental test set into the trained one-dimensional signal noise reduction neural network model to obtain deciphered speckles, and based on the deciphered speckles, adopting ghost imaging correlation operation to obtain a cracked plaintext image. That is to say, based on the basic principle of ghost imaging encryption, the inherent linear property of the ghost imaging light path is utilized, and the fusion architecture of the differential attack and the neural network is used, so that the cracking of various ghost imaging encryption methods can be realized, and the universality and reliability of ghost imaging encryption analysis can be improved.

An apparatus includes a wavelength swept light source to generate a measurement beam, a scanner to move the measurement beam on a sample, a measurement device to measure the sample, and a safety device to stop the light source based on sweeping status of the light source.

An optical security element may be printed on a substrate. The optical security element may include a plurality of bifunctional pigment flakes provided in a binder. A bifunctional pigment flake in the plurality of bifunctional pigment flakes may comprise a first surface having a diffraction grating relief with a first modulation, and a second surface having a second modulation that is smaller than the first modulation. The plurality of bifunctional pigment flakes are arranged such that, in a presence of incident light, diffraction colors are exhibited by a first subset of the plurality of bifunctional pigment flakes that are in a first region of the optical security element, and an interference color is exhibited by a second subset of the plurality of bifunctional pigment flakes that are in a second region of the optical security element.

The invention provides an optical anti-counterfeiting element and an anti-counterfeiting product. The optical anti-fake element comprises a base material and a plating layer, a partial area of at least one surface of the base material is provided with an optical microstructure, the plating layer is arranged on the surface of the side, away from the base material, of the optical microstructure, the optical density of the plating layer is larger than 1, and the optical microstructure is provided with optical microstructure units. At least 200 optical microstructure units are contained in the cross section of at least a local area of the optical microstructure within the span range per millimeter, and the depth of at least one part of the optical microstructure meets the following conditions: when a light beam irradiates the optical microstructure at an incident angle, the light beam is irradiated to the optical microstructure; light of a wavelength or a wavelength range in the light beam is long in interference in the reflected light direction and the transmitted light direction, presents a first color in the reflected light direction and the transmitted light direction and presents a second color in at least one direction near the reflected light, and the first color and the second color are complementary colors. The problems that in the prior art, an optical anti-counterfeiting element is unclear in anti-counterfeiting feature and difficult to manufacture are solved.

This invention relates to the field of optical anti-counterfeiting technology, and discloses an optical anti-counterfeiting document and its preparation method. The optical anti-counterfeiting document includes: a substrate, an undulating structure layer, and a first ink layer, a reflective layer, and a second ink layer sequentially disposed in a first region. The undulating structure layer is disposed on one side surface of the substrate, including a first region having a first microstructure. The first ink layer and the second ink layer have different color characteristics. The first ink layer is disposed closer to the undulating structure layer than the reflective layer. The first ink layer, the reflective layer, and the second ink layer correspond to the projection of the first microstructure onto the surface of the undulating structure layer. The optical anti-counterfeiting document of this invention exhibits different high-chroma visual effects when viewed from both sides, without affecting identification, thus ensuring both anti-counterfeiting effectiveness and aesthetic appeal.

The invention discloses an optical security system based on a photoelectric detector and a verification and judgment method, and relates to the technical field of photoelectric detection. A laser coding end of the optical security and protection system is used for emitting an optical signal with a specific wavelength and switchable incident intensity, a detection panel of a to-be-identified device comprises a plurality of embedded nanowire photoelectric detectors which are arranged in an array mode, and the embedded nanowire photoelectric detectors are arranged in the mode that when the incident intensity of the optical signal is at different preset intensity levels, the embedded nanowire photoelectric detectors are used for detecting the incident intensity of the optical signal. And when the polarities and / or amplitudes of light current signals of the first loop and the second loop of the embedded nanowire photoelectric detector are different from those of the initial current signals, the signal control module executes an unlocking instruction after judging that quadruple information conforms to preset identification logic. According to the optical security and protection system, multi-dimensional information such as the intensity, polarity, sequence and space path of optical signals is used for combined analysis, and high-safety, high-integration and compact-structure optical coding recognition and security and protection control are achieved.

A security document (160, 200, 250, 275) or device (100) includes, a substrate (150, 201) having a first side, a coated surface disposed on the first side of the substrate, an icon layer (120, 205) disposed on the coated surface, the icon layer comprising a plurality of pigmented structures and a focusing layer (211) comprising a plurality of focusing elements (105). Each focusing element (121) of the plurality of focusing elements has a footprint, and the plurality of focusing elements projects a synthetic image (402) of portions of the icon layer in footprints of the plurality of focusing elements.

This invention relates to the field of optical anti-counterfeiting technology and discloses an optical anti-counterfeiting element. The optical anti-counterfeiting element includes a substrate, an image layer, and a focusing element. The substrate includes a first surface and a second surface disposed opposite to each other; the image layer is disposed on the first surface, and the image layer includes several blank areas and several graphic areas; the focusing element is disposed on the second surface, and the central area of ​​the focusing element has a blank area in the orthographic projection area of ​​the image layer. Through the above arrangement, the optical anti-counterfeiting element can be used to acquire anti-counterfeiting images from non-perpendicular viewing angles, and it also avoids acquiring anti-counterfeiting images of the optical anti-counterfeiting element from viewing angles perpendicular to the optical anti-counterfeiting element, effectively improving the anti-counterfeiting and anti-counterfeiting capabilities of the optical anti-counterfeiting element.

The invention relates to an optical security component (100) comprising a set of at least one zone in which it locally comprises a stack of: an adhesive layer (110); a reflective dielectric layer (120); and a support layer (130) on which the reflective dielectric layer (120) is deposited, and which is: i. smooth (131) or ii. structured (132), and which affects the reflection, diffraction, or scattering of an incident electromagnetic wave, in particular visible light. It is essentially characterised in that: it comprises at least one zone of the set in which the thickness of the reflective dielectric layer (120) is locally variable, wherein the variation in thickness of the reflective dielectric layer (120) results in a corresponding variation in colour when the optical component (100) is observed at the same angle of incidence and the same angle of observation.

The present application relates to a kind of optical anti-counterfeiting elements of intersecting micro-relief three-dimensional structure, product and preparation method, the preparation method includes: S1.making micro-relief three-dimensional structure array, so that the fixed point of micrograph array and microlens array substantially coincides, then synthesis superposition, obtain intersecting micro-relief three-dimensional structure array, and generate corresponding micro-relief photoetching file;S2.preparing metal nickel plate;S3.preparing composite mold metal nickel plate;S4.preparing optical anti-counterfeiting film;S5.making reflective medium layer: the surface of the micro-relief three-dimensional structure array layer of the optical anti-counterfeiting film prepared in S4 is provided with reflective medium layer.The present application reduces production difficulty, simplifies technological process, and the quality of optical anti-counterfeiting element is more stable.

A security document (200) includes a secure substrate (205). The secure substrate includes a viewing side (209) and a backing side (211), and a micro-optic system (305, 321) providing an optically variable effect (OVE) (513) on the viewing side. The security document further includes a protective layer (225), and a mask layer (215) disposed between the protective layer and the backing side of the secure substrate.

To provide technology that solves problems in designing and manufacturing specific micro-optical security devices that include achieving desirable properties of a final product against opportunities and constraints imposed by available manufacturing techniques and physical laws, for example.SOLUTION: A security device 100 includes image icon arrays 110a, 110b, refractive image icon focusing element arrays 120, and a sealing layer 125. The refractive image icon focusing element arrays are disposed above the image icon arrays such that a part of the refractive image icon focusing element arrays projects a synthetic image, and the refractive image icon focusing element arrays contact the sealing layer along a non-planar boundary. Furthermore, at least one of the refractive image icon focusing element arrays and the sealing layer includes an organic resin mixture having a first refractive index, at least one of the refractive image icon focusing element arrays and the sealing layer includes a low refractive index material, and the low refractive index material has a second refractive index.SELECTED DRAWING: Figure 1A

The invention belongs to the technical field of optical security communication, and discloses a quantum key distribution ring network, which comprises a ring network formed by a central node and N intermediate nodes, when quantum key distribution is carried out between the central node and any intermediate node, random phase modulation is carried out on the central node and any intermediate node to generate symmetric keys; when quantum key distribution is carried out between any two intermediate nodes, random phase modulation is carried out on the two intermediate nodes, the central node does not carry out phase modulation, and after signal transmission and detection are completed, the central node publishes a measurement result and generates a symmetric key. Compared with the prior art, the quantum key distribution between any two nodes in the ring can be realized without a trusted relay, the intermediate node is simple in structure, only phase modulation and light intensity monitoring are needed, a sending end and a receiving end do not need to be arranged at the same time, polarization compensation and phase compensation are not needed, resource consumption is reduced, stability is improved, and the method is suitable for popularization and application. And the deployment and operation cost is greatly reduced.

The utility model provides an optical anti-fake device with hidden information. The optical anti-fake device comprises a base material and a composite micro-nano structure layer arranged on one side of the base material. The composite micro-nano structure layer comprises a main structure area and a hidden information structure area, the main structure area comprises a plurality of main micro-nano structures, the hidden information structure area comprises an imaging structure with a target phase distribution diagram and a non-imaging area, and the area ratio of the main structure area to the hidden information structure area is larger than 1; the main structure region and the hidden information structure region have a mutual overlapping region. The imaging structure of the hidden information structure is ingeniously hidden in the main structure, the information hiding effect is achieved, and the anti-fake function is achieved.

A security document 1, e.g. a passport, comprises a plurality of bound pages including a cover page 10 and at least one further page which is a security page 20, e.g. passport data page, bound immedia

A substrate (S) for use in forming a security product, e.g. a banknote, the substrate (S) having a laminated structure (1, 5, 3, 2) comprising: at least one upper layer (1, 5) of polymeric material; and at least one lower layer (3, 2) of polymeric material; wherein the laminated structure (1, 5, 3, 2) includes at least one at least partially diffractive optical security element (4) incorporated between the upper (1, 5) and lower (3, 2) layers.

The present invention relates to a method for clearly marking and a method for identifying physical objects, a method for offline verification of a physical object, a method for hybrid offline and online verification of a physical object, a method for expanding the marking by further unique codes, a physical object having an optical security feature for clearly marking and identifying, a serialization and / or track & trace system based on an optical security feature such as this, and the use of an optical security feature such as this in a serialization and / or track & trace system and / or for object authentication, for offline verification and / or hybrid offline and online verification of a physical object and in a method for expanding the marking by further unique codes.

Disclosed are devices with dynamic optical properties suitable for use as security or authentication devices, for example for documents or items of importance or value, in order to help prevent counterfeit of the same. Such devices, at least in selected embodiments, enable observation of dynamic changes or moving entities within the device by collective or enhanced imaging of the dynamic changes or moveable entities, the motion or position of which may otherwise be difficult to observe, or indiscernible to, the naked eye.