An integral image device (1) comprises an array (20) of focusing micro-lenses (22), optionally a reflecting layer (40) and an image fragment plane (30). The reflecting layer is positioned on a same side of the array of focusing micro- lenses as a focal plane of the focusing micro-lenses as such. The reflecting layer is arranged for reflecting at least a part of light incident on a surface (49) of the reflecting layer facing the array of focusing micro-lenses. The image fragment plane has image fragment structures (32). The array of focusing micro-lenses is positioned between the reflecting layer and the image fragment plane. The image fragment plane is arranged to, when being viewed refracted through the array of focusing micro-lenses towards the reflecting layer, reflected by the reflecting layer and refracted back through the array of focusing micro-lenses from the reflecting layer, give rise to an integral image.
G06K 19/16 - Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code using markings of different kinds in the same record carrier, e.g. one marking being sensed by optical and the other by magnetic means at least one kind of marking being used for authentication, e.g. of credit or identity cards the marking being sensed by radiation the marking being a hologram or diffraction grating
G09F 19/14 - Advertising or display means not otherwise provided for using special optical effects displaying different signs depending upon the view-point of the observer
2.
PRINTING TOOL FOR PRODUCTION OF SYNTHETIC IMAGE DEVICES AND A METHOD OF MANUFACTURING SUCH A TOOL
A method for manufacturing of a tool for production of synthetic image devices comprises cutting (210) a surface structured plate, giving a respective first and second edge. The plate has geometrical structures - microimages or focusing elements - in a first surface. Cells comprising the geometrical structures have a predetermined period in a first direction. The first edge is brought (212) to face the second edge in a close proximity. The first direction of a first area of the plate adjacent to the first edge is positioned with a predetermined angle with respect to the first direction of a second area of the plate adjacent to the second edge. A relative translation in said same plane between the first edge and the second edge is adapted (214) for bringing a first cell border in the first area to a predetermined distance, relative a corresponding second cell border in the second area. The first and second edges are mutually fixated (216) and mounted (218) onto a cylindrical support. A tool for manufacturing of synthetic image devices is also disclosed.
A method for manufacturing a printed product comprises provision (210) of a matrix comprising a matrix surface having a plurality of recesses. A first curable compound is applied (212) to the matrix surface to fill the recesses with the compound. The matrix surface and the filled recesses are covered (220) by a pickup layer of a second curable compound. The matrix is brought (230) in contact with the substrate surface and the first curable compound and the second curable compound are cured (232). The matrix surface is separated (234) from the substrate surface, leaving the pickup layer and the first curable compound on the substrate surface. The pickup layer and the first curable compound are thus transferred (240) together from the matrix surface onto a substrate surface of a substrate sheet. The first curable compound forms printed product micro features at the pickup layer covering the substrate surface.
G03F 7/00 - Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printed surfacesMaterials therefor, e.g. comprising photoresistsApparatus specially adapted therefor
A method for enabling reading of an optical device that has an array of focusing elements and is configured to provide a synthetic image, comprises arranging (210) of the optical device to obtain a first predetermined shape and controlling (220) of an image plane selector to select an image plane at a first position relative a surface of the optical device. An observable two- dimensional section of the synthetic image taken at the selected image plane is thereby provided. A device for enabling reading of an optical device is also disclosed.
The present invention provides a method of producing a product comprising an array of product features (3) arranged on a surface (7) of a substrate sheet (5), and an arrangement for the production of such products. In this method curable compound ( 13) is filled into recesses of a matrix (8), pre-cured and then printed onto the substrate sheet (5), thereby forming printed product features (3). These printed product features (3) and additional product features (2) arranged on the opposed side of the substrate sheet (5) may form image objects and focusing elements, respectively, of a synthetic image device. By way of example a cast cure step can be used to form the additional product features (2). Preferably the production of the product is performed in a continuous roll-to-roll process.
G03F 7/00 - Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printed surfacesMaterials therefor, e.g. comprising photoresistsApparatus specially adapted therefor
H05K 3/12 - Apparatus or processes for manufacturing printed circuits in which conductive material is applied to the insulating support in such a manner as to form the desired conductive pattern using printing techniques to apply the conductive material
6.
DEVICES FOR INTEGRAL IMAGES AND MANUFACTURING METHOD THEREFORE
A method for manufacturing integral image devices comprises defining (210) of a set of digital model representations of a set of models. The method comprises calculation (212) of a digital projection representation of the set of digital model representations onto a plurality of virtual cells as viewed from a respective one of a plurality of projection origins. Each virtual cell has at least one pixel corresponds to an associated model. The associated model is allocated in dependence of the projection angle. Structures corresponding to the virtual cells are physically created (220) in cells at an image plane of a device, distributed according to an image array. The creation is controlled by the digital projection representation. A plurality of focusing elements of the device is physically created (230), distributed according to a focusing element array. The image array and the focusing element array are created in conformity with each other.
An optical device (10) for providing a synthetic integral image comprises a polymer foil stack. A first interface (17) of the polymer foil stack comprises at least one image area (82). A second interface, at a distance from the first interface, has focusing elements in a two-dimensional focusing element array. Optically distinguishable image data bearer structure points (83) are distributed over image areas (82) with a density above a first threshold, and over a background area (84) outside the image areas (82) with a density below a, lower, second threshold. The image data bearer structure points (83) within the image areas (84) together cover a minor part of the total area of the image areas (84).
B42D 15/10 - Identity, credit, cheque or like information-bearing cards (record carriers, e.g. credit or identity cards, for use with machines and with at least a part designed to carry digital markings G06K 19/00)
An optical device for providing a synthetic integral image (25) comprises a polymer foil stack. A first interface of the polymer foil stack comprises optically distinguishable image data bearer structures (16A-C) in a first array. A second interface of the polymer foil stack has focusing elements (1) in a second array. A ratio between distances between neighbouring objects in the first array and of focusing elements in the second array in a first direction is different from a ratio between distances between neighbouring objects in the first array and of focusing elements in the second array in a second direction. This leads to that the synthetic integral image corresponding to the image data bearer structures is perceptible with requested proportions when the polymer foil stack is given a certain curvature. Also polymer foil stacks giving rise to synthetic integral image only when viewed from a very short distance are described. The appearance of the synthetic integral image during bending or moving of the polymer foil stack is used for authentication. A change in apparent image depth during rotation is alternatively used for authentication.
An optical device (10) for providing a synthetic integral image comprises a polymer foil stack (111). The polymer foil stack (111) comprises at least one polymer foil (11). A first interface (17) of the polymer foil stack (111) comprises optically distinguishable image data bearer structures (116). The first interface (17) has a general shape defined by a first array (115) of curved interface portions (117), on which the image data bearer structures (116) are superimposed. Preferably, the optical device (10) comprises a second interface (12) of the polymer foil stack (111), which has a second array (13) of microlenses (14). The second interface (12) is provided at a distance from the first interface (17), which distance is close to a focal length of the microlenses (14). The second array (13) is in registry with the first array (115).
G02B 27/22 - Other optical systems; Other optical apparatus for producing stereoscopic or other three-dimensional effects
B32B 3/12 - Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shapeLayered products comprising a layer having particular features of form characterised by a discontinuous layer, i.e. apertured or formed of separate pieces of material characterised by a layer of regularly-arranged cells whether integral or formed individually or by conjunction of separate strips, e.g. honeycomb structure
G06K 19/16 - Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code using markings of different kinds in the same record carrier, e.g. one marking being sensed by optical and the other by magnetic means at least one kind of marking being used for authentication, e.g. of credit or identity cards the marking being sensed by radiation the marking being a hologram or diffraction grating
The present invention provides a method of producing a two-sided microstructured product and a registration structure that can be used for the method. The method comprises the steps of: (800) providing primary product features (80) at a first surface of a substrate sheet (50); (810) providing secondary product features (90) at an opposed surface; (820) registering the mutual alignment of the primary and secondary product features (80, 90) to estimate alignment parameters; and (830) aligning the provision of primary and secondary product features (80, 90).The registration structure comprises a registration-array of focusing elements (20) at a first surface and a registration-array of reference objects (30) at an opposed surface aligned with primary and secondary product features (80,90) that provides a holographic representation (10) of the reference objects(30) in order to estimate the alignment of product features (80,90).
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