118 results about "Invisible ink" patented technology

A portable authentication device and method of authenticating products or packaging by analyzing key ingredients on products or on product packaging is disclosed. Light-sensitive compounds can be used to identify the product or product packaging. The product or product package may include visible or invisible ink containing a particular light-sensitive compound. The ink may be printed in one or more locations on the product or product packaging to produce an authentication mark, such as a bar code. The device includes an assembly for providing a source of light to irradiate the ink containing the light-sensitive compound on the sample product or product package, an optical detector to detect certain spectral properties emitted or absorbed by the irradiated ink and a controller to determine the authenticity of the sample product or product package by comparing the emitted or absorbed properties to a standard.

Water-based invisible red fluorescent inks provide machine-readable, inverse contrast invisible images and can be printed using conventional ink jet printers. The inks employ rare earth complexed ligand fluorophores having narrow excitation and emission spectra. In one embodiment the images are printed with an ink comprising water and a water-soluble organic fluorescent fluorophore, which when printed and dried on paper is invisible to the eye and fluoresces in the green to infrared range, e.g., from about 550 to 1200 nm, when irradiated with short wave length UV radiation, e.g., from 230 nm to 280 nm. The highly specific excitation and emission rates, coupled with a high inverse contrast on papers of all colors, makes them particularly useful as ink jet inks for postal and other purposes.

A latent or “invisible ink” security marking formulation is provided using a phosphor with distinct emissions characteristics including visible emission due to excitation at a particular invisible wavelength. An insoluble inorganic phosphor with this or a similarly distinct emission characteristic is milled to a small particle size, preferably less than one micron particle diameter, and is combined with a carrier at very low pigment concentration, for example one percent by weight of the ink formulation. Preferably the pigment is cropped to resin particles in a binder. This ink formulation is diluted by a volatile solvent and applied using a conventional inkjet printer of the type used to mark codes on packages and labels. To test for security purposes the printing is irradiated and a response according to the predetermined characteristic is noted (or not noted) to detect security information. The marking is not immediately apparent and without knowledge of the specific phosphor used is difficult for a counterfeiter to reproduce.

The inkjet recording apparatus having: a color ink recording head to jet color ink toward a recording medium; an invisible ink recording head to jet invisible ink toward the recording medium; a light irradiating device to irradiate light toward the recording medium to cure ink; a moving section to reciprocate the recording heads and the light irradiating device in a width direction of the recording medium; a conveying section to convey the recording medium; and a control section to perform a control so that while the recording heads and the light irradiating device are moved, the color ink recording head jets the color ink, then the light irradiating device irradiates the color ink with light, and thereafter the invisible ink recording head jets the invisible ink, then the light irradiating device irradiates the invisible ink with light after a lapse of a certain time from the invisible ink jetting.

A method of authenticating products or packaging by analyzing key ingredients on products or on product packaging is disclosed. Light-sensitive compounds can be used to identify the product or product packaging. The product or product package may include visible or invisible ink containing a particular light-sensitive compound. One or more light-sensitive compounds and ink, if used, may be printed in one or more locations on the product or product packaging to produce an authentication mark to inhibit inadvertent or intentional removal of the mark, thereby rendering the mark tamper-resistant. The mark is sealed to isolate the mark from the environment. A device may be used to irradiate the mark and read light absorption or emission. A controller determines the authenticity of the mark by comparing the emitted or absorbed properties to a standard.

Described herein are a system and methods for generating 3D models using imaging data obtained from an array of camera devices. In embodiments, a stochastic shape distribution may be applied upon an object to be modeled in invisible ink. The system activates a first lighting mode which causes the stochastic shape distribution to be visible and captures a first set of images that depict the stochastic shape distribution on the object. The system then activates a second lighting mode that causes the stochastic shape distribution to be hidden and captures images of the object as it would normally appear (without the stochastic shape distribution). The images having the stochastic shape distribution may be used to determine alignment information for the images within the set of images. That alignment information may then be attributed to the second set of images and used to generate the 3D model.

An inkjet recording method and apparatus includes: forming a color image with color inks and an invisible ink by while scanning a first recording head multiple times on a same recording area of the recording medium, forming a thinned-out image, and jetting an invisible ink from a second recording head in accordance with an adhering amount of the color inks per unit area, wherein a nozzle pitch of the first recording head is from 10 to 50 μm, the color inks contain pigments, organic solvent with high boiling point and water, a dot formed by the color inks has a size of 10 to 50 μm, the recording medium has a transferred amount at 0.04 seconds of absorption time of 10 ml / m2 or more, a micro-porous layer containing inorganic fine particles and a hydrophilic binder and a 20-degree specular gloss of 20 to 45%.

A method for improving the readability of composite images by determining available areas on a document where no text or graphics will be printed in visible ink and printing one or more 2-D bar code with invisible ink at a size pre-determined based on the available areas. The one or more auxiliary 2-D bar codes are printed in luminescent ink, either invisible or lightly colored when viewed under white light.

A method of invisible ink fabrication. A first ink having an activator without a leucodye is prepared. A second ink having a leucodye is prepared without an activator, which is combined with the first ink prior to color development and prior to printing. Preferably, the combined ink is printed immediately after being created. Further disclosed are items created using the ink such as toys, puzzles, stickers, coloring books, tags, labels and security devices.

An inkjet recording method and apparatus comprising: forming a color image with color inks and an invisible ink by while scanning a first recording head multiple times on a same recording area, forming a thinned-out image, and jetting an invisible ink from a second recording head in accordance with an adhering amount of the color inks per, wherein a nozzle pitch of the first recording head is from 10 to 50 μm, the color inks comprise C, M, Y and BK inks and at least one special color ink, the color inks contain pigments, at least one organic solvent with high boiling point and water, a dot formed color inks has a size of 10 to 50 μm, and the recording medium has a transferred amount at 0.04 seconds of absorption time of 10 ml / m2 or more, a micro-porous layer containing inorganic fine particles and a hydrophilic binder.

A re-transfer printing machine 60 uses an ink film 33 having a sublimation-ink area of sublimation inks Y, M, C and an invisible-ink area of an invisible ink UVS and an intermediate-transfer film 11 having a protecting layer 11c and an ink receptor layer 11d enabling the sublimation inks and the invisible ink to be received. The machine includes an overlap detecting part 76-5 for detecting whether a print image contains an overlapping between a sublimation-ink image 18 and an invisible-ink image 20 and a controller 6 for controlling a transfer operation corresponding to detection by the overlap detecting part. If the overlap detecting part detects that the print image contains the overlapping, the controller allows the machine to transfer the sublimation-ink and invisible-ink images to different areas in the receptor layer. If not, the controller allows the machine to transfer the sublimation-ink and invisible-ink images to an identical area 212 in the receptor layer.

An inkjet recording method and apparatus including: forming a color image with color inks and an invisible ink by while scanning a first recording head multiple times on a same recording area, forming a thinned-out image, and jetting an invisible ink from a second recording head in accordance with an adhering amount of the color inks per, wherein a nozzle pitch of the first recording head is from 10 to 50 μm, the color inks comprise C, M, Y and BK inks and at least one special color ink, the color inks contain pigments, at least one organic solvent with high boiling point and water, a dot formed color inks has a size of 10 to 50 μm, and the recording medium has a transferred amount at 0.04 seconds of absorption time of 10 ml / m2 or more, a micro-porous layer containing inorganic fine particles and a hydrophilic binder.

Identification documents have a three dimensional or moving image effect to enable human verification of their authenticity. These effects are created by printing image layers of invisible inks, such as UV or IR fluorescing inks, each depicting an object in varying position or perspective in an area on the document. When the area is strobed sequentially in different bands corresponding to the different layers, the layers become visible sequentially or simultaneously, creating a moving and / or three dimensional effect.

An inkjet recording method and apparatus includes: forming a color image with color inks and an invisible ink by while scanning a first recording head multiple times on a same recording area of the recording medium, forming a thinned-out image, and jetting an invisible ink from a second recording head in accordance with an adhering amount of the color inks per unit area, wherein a nozzle pitch of the first recording head is from 10 to 50 μm, the color inks contain pigments, organic solvent with high boiling point and water, a dot formed by the color inks has a size of 10 to 50 μm, the recording medium has a transferred amount at 0.04 seconds of absorption time of 10 ml / m2 or more, a micro-porous layer containing inorganic fine particles and a hydrophilic binder and a 20-degree specular gloss of 20 to 45%.

The invention discloses a printing and recognition method for an invisible and encrypted two-dimension code. In combination with dual anti-fake characteristics of the encrypted two-dimension code and invisible ink, anti-fake information can be recognized only by professional reading equipment, and therefore the anti-fake performance is improved. By the utilization of the technology, the information of the encrypted two-dimension code can be displayed under ultraviolet or infrared lamplight, and then the professional reading equipment is used for reading the encrypted information in the two-dimension code, so that the dual anti-fake purpose is achieved to improve the anti-fake performance.

A system and method is provided for the real time auditing of covert data marks. Specific information relating to a product or document is entered into an information cell or shell from a product data file. A high definition, high resolution, high speed inline video system is provided to take specific details from the individual product or document, which details are added to the data cell or shell. Details are then inspected, quality checked, matched in the event there are multiple identifiers (e.g., currency would normally carry two matching sequential numbers), and verified to the product order. This cell or shell is passed to the special design computer / controller through a high speed electronic interface. Information entering the computer / controller is once again verified and matched to the original data as well as the product or document. The cell or shell is converted into a specially created 2-dimensional bar code which is encrypted by the computer / controller and then transformed into a video rip. This video rip is sent to high quality / high resolution production print engines. The encrypted 2-dimensional bar code is imaged directly to the product or document as it is carried past the print imaging engines. The ink also is specially designed and manufactured for this system and process. It is an invisible ink which is unique, durable, permanent and not available commercially (covered under trade secrets). These special inks are well suited for delivery using inkjet technology to efficiently make well formed invisible images at slow to high speed production schemes. The product or document is then sent instantly into a drying scheme (this can be air, forced air, heat, UV Dryer, depending on the printing system selected). After drying there is a final scanning. This scanning equipment is the same scanner design which will be used in the field so that each product or document will be verified with the actual scanning device and programs which will be used in the field. From this final scanning of the 2-dimensional data bar code, a final audited product or document profile is created, as is a database which will be the point of reference in the infrastructure during the life of the product or document. Each time any product or document is scanned at a transaction point, the database will be updated, either in real-time or downloaded from a data collection scanning device. This will build a complete history from the point of manufacture to the moment it is removed from service.

A method for improving the readability of composite images by determining available areas on a document where no text or graphics will be printed in visible ink and printing one or more 2-D bar code with invisible ink at a size pre-determined based on the available areas. The one or more auxiliary 2-D bar codes are printed in luminescent ink, either invisible or lightly colored when viewed under white light.

A combined printing and binding device which is designed to print and bind a multi-page interactive publication. The device includes a communicator which is designed to receive a set of page descriptions from a computer system. The page descriptions correspond to the pages of the interactive publication and each page description includes content information and coded data. The device also includes a printer which is designed to print, onto media sheets, each of the page descriptions received by the communicator. The printer does this by simultaneosly printing the content information in visible ink and the coded data in substantially invisible ink. The device also includes a binder that is designed to bind the printed media sheets together to form the printed, bound, interactive publication.

The invention discloses silicon quantum dot-based fluorescent invisible ink. The silicon quantum dot-based fluorescent invisible ink is suitable for writing, ink-jet printing and stamp-type engraving. According to demands, the silicon quantum dot surface is subjected to lipophilic or hydrophilic modification and is used for preparation of solvent-type fluorescent invisible ink and aqueous fluorescent invisible ink, and the solvent-type fluorescent invisible ink and aqueous fluorescent invisible ink can be matched with different types of printing ink or ink. The silicon quantum dot-based fluorescent invisible ink is colorless under natural light and can give out orange or red visible light under the action of UV.

The invention discloses a manganese-doped inorganic halogen perovskite quantum dot, and a preparation method and an application thereof. The preparation method comprises the following steps: dissolving lead salt and manganese chloride, and carrying out heating at 80 DEG C to 110 DEG C so as to obtain a halogen precursor; dissolving caesium salt so as to obtain a caesium precursor; adding the caesium precursor into the halogen precursor, and carrying out heating at 80 DEG C to 110 DEG C so as to obtain a quantum dot solution; and purifying the quantum dot solution so as to obtain the manganese-doped inorganic halogen perovskite quantum dot. The invention provides a method for high-yield preparation of the manganese-doped inorganic halogen perovskite quantum dot without the need of protection of inert gas at a low temperature. The method provided by the invention reduces preparation cost, improves preparation efficiency, and can be used for large-scale production. The quantum dot is applied to invisible ink which has good effect, is convenient to write and has stable invisible effect; meanwhile, after manganese is doped, the quantum dot has greatly-improved thermal stability and greatly-reduced toxicity.

The invention discloses color fluorescent anti-counterfeiting invisible ink powder and a preparation method thereof. The color fluorescent anti-counterfeiting invisible ink powder comprises ink powder resin, a colorless fluorescent agent, wax, a charge control agent and an additive, wherein the ink power resin, the wax, the charge control agent and the additive are all colorless materials; the ink powder resin is a homopolymer or copolymer of monovinyl monomers; the colorless fluorescent agent is a colorless fluorescent mixture capable of emitting cyan light or pinkish red light or yellow light under excitation of ultraviolet light and obtained by compounding colorless fluorescent compounds capable of emitting visible red light or green light or blue light under the excitation of ultraviolet light with wavelength of 365nm; and the colorless fluorescent mixture, the wax, the charge control agent and the additive account for 0.1-20%, 1-30%, 0.1-5% and 0.5-5% of the weight of the monovinyl monomer, respectively. The color fluorescent anti-counterfeiting invisible ink powder disclosed by the invention can truly display the color image of the manuscript under ultraviolet light and is colorless and invisible under natural light; and therefore, the ink can be used for printing colorful anti-counterfeiting images and texts and is capable of greatly improving the anti-counterfeiting reliability.

The inkjet recording apparatus has a color ink recording head to jet color ink toward a recording medium; an invisible ink recording head to jet invisible ink toward the recording medium; and a light irradiating device to irradiate light toward the recording medium to cure the ink. A control section causes the color ink to be jetted then the light irradiating device irradiates the color ink, thereafter the invisible ink is jetted, and finally the light irradiating device irradiates the invisible ink after a lapse of a certain time from the invisible ink jetting.

A combined printing and binding device which is designed to print and bind a multi-page interactive publication. The device includes a communicator which is designed to receive a set of page descriptions from a computer system. The page descriptions correspond to the pages of the interactive publication and each page description includes content information and coded data. The device also includes a printer which is designed to print, onto media sheets, each of the page descriptions received by the communicator. The printer does this by simultaneosly printing the content information in visible ink and the coded data in substantially invisible ink. The device also includes a binder that is designed to bind the printed media sheets together to form the printed, bound, interactive publication.

A method to prevent check fraud and to ensure valid negotiable instrument transactions with the use of randomized alphanumeric and special character sequence passwords or passcodes. Check stock is prepared with either serialized or un-serialized check numbers printed on the check stock. Randomized passcodes are generated, one for each check in the check stock. Each of the randomized passcodes is printed on a single check and correlated to a unique check number. A passcode file listing correlated check numbers and passcodes is prepared. Alternatively, the passcode can be maintained physically separate from the check. When a check is presented for payment, the check number and passcode has to be presented to the payor bank that compares the check number / passcode combination to list in the passcode file. If there is no match, or if the match has occurred before concerning another payment, the check is invalidated. The passcodes may be printed on the checks in invisible ink. If invisible ink is used, payee banks process presented checks to render the invisible passcodes visible before transfer to either a check clearing unit, or a payor bank. Alternatively, two sets of randomized passcodes can be created and used with one passcode printed on a check and correlated to the check number and a second passcode maintained physically separate from the check and delivered separately to the check payee for presentment with the check to seek validation and payment.

The present invention is directed to a method of offset lithographic printing text and images using invisible inks in order to provide differing visual characteristics when the text or image is observed under varying light conditions. That is, one image may be observed under normal, e.g., ambient, incandescent and fluorescent light conditions whereas another image may be observed only when the whole image is subjected to ultra-violet light such as a “black light.”

A novel steganographic approach analogous to the real-world secret communication mechanism, in which messages to be concealed are written on white papers using invisible ink like lemon juice or milk and are revealed only after the papers are heated, is proposed. Carefully designed informed-embedders now play the role of “invisible ink”; some pre-negotiated attacks that can be provided by common content processing tools correspond to required “heating” process. Theoretic models and feasible implementations of the proposed digital-invisible-ink (DII) watermarking approach are provided. The proposed DII watermarking schemes can prevent the supervisor from interpreting secret messages even the watermark extractor, decryption tool, as well as session keys are available to the supervisor. Furthermore, under certain steganographic application scenarios, secret communication systems employing the DII watermarking schemes can aggressively mislead the channel supervisor with fake payloads and transmit genuine secrets at the same time.

An ink, wherein the ink (260) includes a jettable vehicle, and a colorant configured to fluoresce in a visible light range when exposed to an ultraviolet (UV) light (515), wherein the ink (260) is edible, and wherein the ink (260) is invisible when viewed under white light conditions.

The invention discloses an anti-fake combination set which cannot be faked easily and is high in anti-fake performance. The anti-fake combination set comprises an anti-fake pen and an anti-fake label. The anti-fake pen is provided with a power switch, an ultraviolet transmitting port, a voice device and a data line interface. A control circuit, a storage battery and an ultraviolet photoelectric sensor are arranged in the anti-fake pen. The ultraviolet photoelectric sensor is installed in the ultraviolet transmitting port, and the power switch, the storage battery, the ultraviolet photoelectric sensor, the voice device and the data line interface are all connected with the control circuit. The anti-fake label comprises a bottom layer, an anti-fake layer and a protective layer. The anti-fake layer is arranged between the bottom layer and the protective layer. Lattice codes and encrypted images are contained in the anti-fake layer and are made with ultraviolet invisible ink. The anti-fake combination set has the advantages that a software system inside the anti-fake pen is updated initiatively, and the anti-fake combination set has two voice playing modes, can adjust the volume and perform dual anti-fake identification, has high anti-fake capacity, is wide in application range, safe and high in reliability and saves energy.