A micro-optic device, including: a substrate; a plurality of image elements in an image plane; and a plurality of focusing elements, each focusing element focusing light to a focal point on the image plane and magnifying any portion of an image element falling within the focal point to thereby produce an image pixel projected to a user at one or more viewing angles, the focal point having an extent smaller than the image element, wherein each image element includes an image sub-element having a different discernible level of brightness to elsewhere in the image element, the brightness of each projected image pixel being dependent on the proportion of the focal point filled with the image sub-element, and wherein each image sub-element has one or more attributes in the image plane, such that, from a given viewing angle, the brightness of each projected image pixel is dependent on each attribute of each image sub-element.

An identification medium comprising a first resin layer and a second resin layer in this order from a viewing side, wherein the first resin layer contains a first cholesteric liquid crystal resin that is a cured product of a first liquid crystal composition, and the first cholesteric liquid crystal resin selectively reflects light at a wavelength of 700 nm or longer and 900 nm or shorter, the second resin layer contains a second cholesteric liquid crystal resin that is a cured product of a second liquid crystal composition, and the second cholesteric liquid crystal resin selectively reflects light at a wavelength of 400 nm or longer and 500 nm or shorter, and the first resin layer has an average value of light transmittance at a wavelength of 400 nm or longer and 425 nm or shorter of 50% or more and 90% or less.

An identification medium comprising a first resin layer and a second resin layer in this order from a viewing side, wherein the first resin layer contains a first cholesteric liquid crystal resin that is a cured product of a first liquid crystal composition, and the first cholesteric liquid crystal resin selectively reflects light at a wavelength of 700 nm or longer and 900 nm or shorter, the second resin layer contains a second cholesteric liquid crystal resin that is a cured product of a second liquid crystal composition, and the second cholesteric liquid crystal resin selectively reflects light at a wavelength of 400 nm or longer and 500 nm or shorter, and the first resin layer has an average value of light transmittance at a wavelength of 400 nm or longer and 425 nm or shorter of 50% or more and 90% or less.

The present invention is related to a manufacturing method of an optical feature for documental security which includes multiple latent images whose visualization depend on the mode the feature is observed. The method comprises the steps of defining the different regions present on the inner surface of a first confinement structure; inducing different alignment directions on the defined regions; defining a second alignment structure wherein the second structure is a polarizer with multiple patterns; placing the liquid crystal between the first and the second structures, and polymerizing the liquid crystal, forming a sheet. The images are visible by means of a polarized light source or a polarizing sheet.

The present invention is related to a manufacturing method of an optical feature for documental security which includes multiple latent images whose visualization depend on the mode the feature is observed. The method comprises the steps of defining the different regions present on the inner surface of a first confinement structure; inducing different alignment directions on the defined regions; defining a second alignment structure wherein the second structure is a polarizer with multiple patterns; placing the liquid crystal between the first and the second structures, and polymerizing the liquid crystal, forming a sheet. The images are visible by means of a polarized light source or a polarizing sheet.

The disclosure relates to the technical field of secure identification document, specifically to a method for producing a color secure identification document and a color secure identification document thereof. The method comprises: etching identity information on the substrate of the data surface of document by laser, and the identity information comprises a black-and-white image and text information; printing a color image on the black-and-white image with color ink so that the color image and the black-and-white image are aligned and coincide with each other to form a personalized data surface; and printing a transparent protective layer on the upper surface of the personalized data surface with a transparent varnish, wherein the protective layer covers the color image.

The disclosure relates to the technical field of secure identification document, specifically to a method for producing a secure identification document with a color portrait and a secure identification document thereof. The method comprises: etching identity information on the substrate of the data surface of document by laser, and the identity information comprises a black-and-white portrait and text information; printing a color portrait in a blank space of the substrate with color ink to obtain a personalized data surface, and the color portrait is an enlargement of the black-and-white portrait in equal proportion; and printing a transparent protective layer with a transparent varnish on the upper surface of the personalized data surface, wherein the protective layer covers the color portrait.

A method for producing flakes of a resin thin film including: a step (1) of forming a resin thin film on a substrate film to obtain a multilayer film; a step (2) of pressing the multilayer film by a member having a concavo-convex shape to form cracks in the resin thin film; and a step (3) of stripping the resin thin film from the substrate film to obtain flakes. The step (2) is preferably performed with a pressing pressure of 100 MPa or less. The resin thin film is preferably formed of a cured product of a photocurable liquid crystal composition. The resin thin film is preferably a cholesteric resin layer.

A method for producing flakes of a resin thin film including: a step (1) of forming a resin thin film on a substrate film to obtain a multilayer film; a step (2) of pressing the multilayer film by a member having a concavo-convex shape to form cracks in the resin thin film; and a step (3) of stripping the resin thin film from the substrate film to obtain flakes. The step (2) is preferably performed with a pressing pressure of 100 MPa or less. The resin thin film is preferably formed of a cured product of a photocurable liquid crystal composition. The resin thin film is preferably a cholesteric resin layer.

A polarizer film is formed to include sets of polarized lines (sets of parallel lines) oriented at several directions across the surface of the film. The lines may be created using a printing process that transfers grooves from a printing plate to the film (e.g., an embossing process). A rotogravure printing process (or other suitable process) is then used to apply a liquid polarizing dye material to the printed film. The dye molecules align along all of the various grooves embossed in the film, forming a multi-axis polarizer film. The film may be used to form separate multi-axis polarizer labels (useful in anti-counterfeiting applications), and a process of easily removing the individual labels from the original film is described.