Protective device

 

The invention relates to security documents and other valuable products from illegal reproduction or forgery. The technical result is to increase the protection of valuable products. The protective device comprises a holographic structure, generating an optically variable effects, comprising at least two sections. When illuminated with white light forming the image of the two graphical elements located on or near the plane of the adjacent or coincident with the plane of the device. When coherent light areas form a latent image in the form of signs, the plane of which is located away from the physical plane of the device, the latent image is restored at different angles to the normal basis, supporting device, which leads to a spatial separation latent image on the image plane. Hidden images are not visible when illuminated with white light. 2 C. and 18 h.p. f-crystals, 7 Il.

The invention relates to a protective device intended to protect documents and other valuable products from illegal copying, forgery, etc.

Many of the protective device based on ISCO they are difficult to produce. Examples of such holographic structures and methods for their manufacture can be found in EP-A-0548142, EP-A-0632767 and WO-A-99/59036 owned by the firm of De La Rue International Limited, and the ideas presented in them, as well as in other patents, are referenced in those documents included in the present description by reference. In the application WO-A-92/094444, which also determines the prior art, disclosed a method of creating a detail of the optical microstructure, providing enhanced stability protection and ease of authentication, designed to visually check the authenticity of banknotes. Certain visual protective device on the basis of the diffraction grating already exist, for example, described in EP-A-0105099, which describes a protective device demonstrating the effect of apparent motion, consisting of patches of flat diffraction grating oriented in different directions along the path, each of which generates the diffraction of the incident light beam in a certain direction, although it should be noted that this device is based purely diffraction gratings and each parcel, as a diffraction grating, is not able to form a hidden part in the form of focused or observed in the coherent illumination of the holographic protective structures, in EP-A-0548142 described as using holograms can be created out-of-plane image for authentication, although it is necessary to pay attention to the fact that in this case it was provided that the hardware read structure is completely hidden from visual observation by an observer of the hologram and in fact consists of a combined weak diffraction gratings, which do not form a focused out-of-plane image. In DE-A-3840037 shows an example of a visual protective holograms containing combined additional laser transmissive hologram designed for the formation of out-of-plane image that should be detected in the light of the laser by means of the reading apparatus or the Visualizer and unrecognizable under normal lighting.

There is a continuing need to enhance the protection of such protective devices while ensuring ease of authentication.

In US-A-5825478 described system and method of determining which of the set is visually indistinguishable objects marked as hidden indicator which the system and method provide that the portion of the surface of each object of the first type has a secret th tnim reference light of a specific wavelength.

According to the present invention, the protective device comprises a holographic structure, generating an optically variable effects, contains at least two separate plot, which create when illuminated with white light optically variable image consisting of at least two specific graphical elements located in or near the image plane, coincident or adjacent to the plane of the device, and which, when coherent illumination create at least two separate latent image in the form of signs, the image plane which are at a distance from the physical plane of the device, moreover, the latent image is restored at different angles to the normal basis, supporting device, so that the latent images are spatially separated into its plane image, and the latent image is almost invisible when illuminated with white light.

Under holographic structure, generating an optically variable effects, we, in this case, any implied diffraction device capable of forming the first localized visual graphic near the physical plane of the device, beside the e (instead of the more common rainbow slit), subject to the observation of coherent light. Such a structure can only be created holographic means or by computer simulation and direct entry of the desired interference pattern structure, which is a slower and require much longer time to method to create such element.

Especially useful for this type of holographic patterns, generating an optically variable effect, which provides direction playback visual optically variable image, creating the effect of apparent motion when the device is rotated around a specified axis.

This new holographic security device contains a structure that creates when illuminated with white light, at least two distinct localized optically modifiable graphical image in the image plane adjacent to the structure, and when coherent light, at least two latent image away from the image plane placed at different angles to the normal framework that supports the device. The distance between the latent image is usually about half their size. Thus, under normal OS the fractional effect, consisting at least of two or more parts, but when coherent light such as laser light, the observer sees two or more different hidden images.

These hidden images preferably have the form of graphical elements, characters or alphanumeric characters, which are generally associated with the product or document, which provided a protective device. Visual optically variable image is also preferably take the form of small specific figures or characters.

In the preferred case, the hidden image, the restored when coherent light of the laser device can be seen with the naked eye, although such recovery can also be performed on the wavelength outside the visible range, provided for hardware detection.

According to one variant of implementation, structure, generating an optically variable effects, when illuminated with white light generates two or more graphic images or shapes that create the illusion of movement when the device is rotated. In this connection it is necessary to distinguish between the apparent three-dimensional holographic phenomenon, etc., with the effect of movement, such as lateral offset, obul the her is each element of the holographic patterns that generate optical variable effect is made in the form of a single structure, the maximum transverse size which is usually less than 1.5 mm, Preferably a maximum cross-sectional dimension is not less than 0.5 mm and most preferably is in the range of 0.5 to 0.75 mm, and the device contains at least two elements, reproducing different hidden images in different directions.

The recovery of the latent image can be improved by providing multiple pairs or sets (three or more) of these sites, each element of a pair or set is designed to generate when coherent light of the same latent image, and the other(s) element(s) of the pair or set. In this case, the individual elements must be placed as close to each other so that they can be simultaneously coherent light beam and, thus, to completely recover the hidden message. Typically, the diameter of the spot of the laser beam generated by a laser pointer or similar device, is about 2 or 3 mm.

To increase the degree of protection by increasing the complexity of the device as a whole and that is ucture, generating an optically variable effects, you can put in a set of additional structures that generate optically variable effects, designed to create only images or effects that are visible in white light, and one additional structure, generating an optically variable effects, being illuminated with white light by rotating the basics are working together, creating the effect of moving images. Thus, the unskilled observer will observe the effect of the moving image when illuminated with white light, and only highlighting the correct set of structures that generate optically variable effects, coherent light, he will be able to find hidden images. Under normal lighting with white light it will not detect differences in the structures and whether the device has a hidden image.

According to another variant implementation, the parts of the structure, generating an optically variable effects, made in the form separated from other areas.

As in the first embodiment, to improve the recovery of latent images can provide pairs or sets of such areas, each of which typically has a maximum cross-sectional dimension not practicelink, is in the range of 0.5-0.75 mm

This second variant implementation is particularly useful when the structure when illuminated with white light creates an image moving when the device is rotated. This combination of parts is particularly difficult to reproduce, but to verify its authenticity is easy.

Holographic structure, generating an optically variable effects, capable of forming hidden out-of-plane image has the appearance of a holographic structure that contains two image plane, the plane of the visual image, observed in white light, and a plane out-of-plane image seen in the lighting device of coherent light.

The geometric shape of these separated areas, preferably graphical elements should be focused in close proximity to the plane of the surface of the hologram, while the information encoded in these areas, the focus (or displayed) at a sufficient distance from the plane surface, and therefore to observe and, thus, to control, requires coherent light, for example, with a laser. Each graphical element being illuminated mentioned light source, voprosik, when controlled laser item in full focus in its focal plane or image plane, each information element occupies its own, well-defined and separated from any other zone or area monitoring.

The hidden image can be set, for example, a hardware read a pattern, in particular a bar code, with each graphic element will correspond to a certain part of the barcode.

In some cases, all separated from other areas have the same simple geometric form that is not associated with or not depends on the graphic composition of the main holographic image, such as circles (dots, squares or rectangles. However, the area of these graphic elements should not exceed 3 mm2.

In other cases, the graphical elements can be hidden from the observer, fully integrating them into the main composition of the holographic image. To do this, first choose the smallest (in area), but nevertheless full graphic element or object that forms part of the composition of the holographic image is preferably a graphical element of the composition, which is repeated as an hour or more separate parts. Each of these graphical parts of holographically encode one piece of information that contains the item controlled by the laser.

Usually as graphic elements use characters such as alphanumeric characters, etc.,

Preferably the structure, generating an optically variable effects, is formed as a single continuous structure. However, the elements can be set by means separated from each other substructures, the gaps between them do not cause diffraction of light. In this case, the elements can be formed on separate stages.

Typically, the device is part of the protective holograms or protective optical microstructure (e.g., holograms, kinegrams, pixelarray, raster patterns, stereograms, etc). In this case, preferably the part of the structure, which additionally responds to coherent illumination, characterized by a lower frequency of the grating than part of the structure, which forms the only such(th) image or effect, which(th) can be observed in white light.

Alternative it can be used as a self-protective optical microstructure, in which only a small area, such as fiber banknotes, where e is Noe more hidden protective device, observed with a laser. Especially useful to apply this new item as an additional means of public recognition as hidden images allow public recognition, and as a protective device for banknotes and possibly other important documents, in which the optical microstructure deposited on rough or non-planar base paper, as disclosed here, the tools provide a much higher resistance controlled laser structure to the roughness of paper and crumpling in comparison with the previously known means, since the structure is localized in a small area. Also envisaged is the use of devices for protection of goods with factory mark, financial cards as a device of protection against forgery.

As another possible application of this device can be considered a symbol of the type of trademark-controlled laser. For example, many protective holographic education can be one and the same, at first glance, a simple item for public recognition, included in one region in the form of a set of pixels or picture elements, providing a simple visual effect to the as), which could become a standardized part, but which coherent light from a laser can play completely different observed in the laser light messages found only in coherent light. Thus, it is possible to improve all types of protective holograms and protective devices on the basis of the diffraction grating, for example a raster device and more specialized tools, such as Kinegram (OVD Kinegram Corp.) and exergame (State organization for scientific and industrial research (CSIRO), Australia), which can be used to protect any classified documents in protective labels, including used protective stamps or banknotes, for example, in the form of fibers in paper or holographic strips and labels attached to the paper or other products and basics.

Special benefits can submit the application in the chain of Windows commonly used in banknotes and other security documents, where, despite the existence of a holographic fibers, the area of the survey in each window severely limits the degree of protection that may have a holographic image. The fact that discover a visual image on such a small PLO recognition, and attach additional optical protection against hardware read or laser readable image. According to the present invention, the chain may contain a simple publicly controlled switching or moving picture (potentially, however, sufficiently simplified to simulate through bitmap), which could also play a protective sneaky part, controlled by the laser. Similarly, this item may be included in a repeating bitmap or graphic pattern on the strip or label banknotes to increase the degree of protection of the optical microstructures of the banknote, as disclosed here means significantly more resistant to wrinkling, roughness of paper and other adverse operating conditions in comparison with the previously disclosed details.

Another useful, but a slightly different version of the use of such advanced hardware controlled device is an improved protective device on the banknote, based on the ideas of WO-A-92/094444. In a useful, more secure version of a protective device for public recognition in the form of protective holograms used on the Bank of the th situation pairwise reproducing repetitive simple switching the image using one or both of these holographic elements, in order to ensure the effect of apparent motion (e.g., translational or rotational), which are more difficult to forge in the holographic laboratory, and also provides useful holographic entertainment item for public recognition. In this sequence of repeating items that may not be overlapping or slightly overlapping to provide, for example, the effect of simulating 3-dimensional depth, or effect, simulating an increase in the rotation, some or all of these elements can contain items that are controlled by the laser and observed under relatively simple conditions of coherent light generated, for example, laser pointer.

Another advantage of preferred embodiments of the present invention is that they provide the possibility of additional, third verification level of protection for the protective device comprising opposed to previous systems. The first level of protection is an animated visual image, below which lies in the presence of the hidden message, controlled by the laser, which can detect even relatively unskilled observer, using a simple source of coherent light such as a laser pointer and a viewing screen. Additional, a third level of protection provides an analysis of the angles of play and possibly planes of bending of the image observed with a laser. This can be done for the more sophisticated security check using either laboratory equipment, or reading apparatus, or a viewing device based on the laser that is used to identify the geometry of the playing parts that are controlled by the laser, which gives more accurate results compared to those that can be obtained with a laser pencil, to provide additional characteristic a security check.

Below are some examples of protective devices that meet present invention, with reference to the accompanying drawings, in which: Fig.1 - scheme of the first variant of implementation of the device illuminated with white light; Fig. 2 - different images that can be created with the help of the device shown in Fig.1; Fig. 3 is a diagram of steps of a first variant of the ACLs to the first variant of implementation; Fig. 5A and 5B is a diagram of steps of a second variant implementation of the device, respectively illuminated with white light and laser light; Fig.6 and 7 are diagrams similar to Fig.3 illustrating additional examples of devices with laser light.

According to the first variant implementation, the device is embedded in embossed rainbow hologram to protect.

Standard rainbow embossed hologram 1 (Fig.1), which can optionally contain other holographic protective part (not shown), contains 6 additional points 2 included in one area of the composition, in this case provided sufficiently distinguishable. In this case, use small dots (diameter from 0.25 mm to 1 mm), although you can use a set of graphic elements or other symbols such as the letters of the word. When turning 50 holograms in this case from left to right, when illuminated with white light or normal daylight 51, holographic reproduction point is that the impression of a very unusual of their movement relative to each other, and in this case the 6 points are 2 line 3 with the formation of 3 pairs of pixels that create the image. Direction hologramic directions in the horizontal rotation of the hologram left, right, as schematically illustrate the positions 3-5, corresponding to the different angles of rotation. This apparent movement provides entertainment diffraction item for public recognition, and image are formed near the surface of the device.

In Fig. 2 shows various other types of images that you can use instead of images of points in the plane in accordance with Fig.1. In these examples provided by the sets of letters, consistently appearing as the device is rotated. This sequence can be straight (Fig. 2A and 2B), to form a circle (Fig.2C) or to expand, in other words that appear one after the other letters are farther from the center point (Fig.2D), or may consist of repeated letters, as shown in Fig.2ND.

In a preferred example where the use of at least three lines of play, as shown in Fig.1, and typically three or more pairs or sets of pixels or picture elements, each element of a pair is reproduced in the same direction, useful minimum requirement is to form an effective protective device for public recognition, as well as to provide effective laser vospminaniya for laser playback.

The second element of this new protective details can be observed only when the laser light, and in this case, provides hidden details observed with a laser that unskilled controller can easily check, just highlighting 6 (Fig.3) detail of the diode-laser pointer, laser pen or other similar device and using the simplest projection screen (7), allowing to visualize the out-of-plane play hidden graphic images, although, of course, possible to construct a special reading device, i.e., the detector authentication. However, the advantage of this system is that it provides greater clarity playback out-of-plane components (described below) and are very easy to verify the authenticity of the items that is observed in the laser light, by using very simple, inexpensive means, such as commercially available laser pointers and simple viewing screen to produce images of hidden details. As a viewing screen 7, you can use a plain sheet of paper. Each element of the device being illuminated by coherent laser light, restores, outside the image plane observed in R, when the diameter of the element of 0.75 mm, the size of the actual image at a distance of 250 mm to approximately 25 mm at a distance of 100 mm and about 15 mm). The small spatial extent of each element allows you to make an item invisible in the absence of a coherent light beam.

As is evident from Fig.3, six pixels 2 arranged in pairs, each of which participates in the restoration of the corresponding latent image 7-9. Points 10, 11 form a first pair, restoring the image 7, point 12, 13 form a second pair, restoring the second latent image 8, and the points 14, 15 form a third pair, restoring the third latent image 9.

Because these hidden images 7-9 are formed outside the plane of the normal image and the distance from the device, where they are focused, in ordinary white light, they are normally invisible to the observer.

For convenience, point 2 come close enough to each other so that you can cover them all with one laser beam, the diameter of which is usually 3 mm

Note that, unlike previous systems, because the individual parts are observed in the laser light localized in small regions of the basics, the angle to the La for forming approximately a focused image observed in the laser light, and allows you to see the image on the screen, located relatively close (approximately 50-75 mm, if required) to the base, providing high brightness parts, and at the same time, a narrow viewing angle and a small area of the image plane to hide the image seen in the light of the laser. This differs from other known surveillance systems in the light of the laser, where the latent image is distributed over a larger area, which precludes the vicinity of the image to the media and sufficient brightness due to the fact that the latent image becomes easy to see in the spotlight, and due to the fact that the image in the near plane requires a wide range of angles of play, worsens any combined with it a holographic image, whereas disclosed here, the method provides full localization of the details observed in the laser light, and thus, completely eliminates the deterioration of any other aspects of the attached protective holograms.

Note that, according to a preferred variant implementation, each controlled laser elementary item holographic patterns that generate wholesale the material planes, one (image in white light) in the focal plane, is close to or coincident with the plane of display holograms, where the elementary item is focused to demonstrate visually recognizable graphic details the observer, considering the hologram, and the other in the second focal plane, where you can properly visualize the projected "rainbow crack" in embossed rainbow hologram. In this case, the elementary hologram with coherent light laser restore simple graphic detail, such as a letter or form, and this hidden-controlled laser out-of-plane item is visible only when coherent (laser) light and otherwise invisible to the casual observer, the so-called "white light" light like a spotlight, artificial or natural lighting.

You should pay attention to the fact that the reproduction characteristics of each individual graphic element latent image is almost indistinguishable from the characteristics of color reproduction element simple diffraction grating or a simple lenticular holographic items (i.e. items that reproduces very short rainbow holographic slit ptional lattice), which makes the characteristics of color reproduction and apparent motion-controlled laser area almost indistinguishable from the standard holographic moving parts. This allows you to effectively hide the presence of additional controlled messages read by the laser. This is very different from previously known controlled laser holographic parts that have commercial application.

In these other systems, there are various ways that are less effective than described here a new system, which has several distinct and important advantages over previous methods. Some previous methods provide for the imposition of the controlled laser (or hardware controlled) image over the entire hologram or a large area of the hologram, which degrades the visible image due to the so-called "noise" played when a certain angle. For these systems are also characterized by reduced sharpness of the image seen in the light of the laser, when playing in coherent light, partly due to the fact that the distributed image much more susceptible to distortions caused sherohovatosti), which cause blurring out-of-plane image owing to the small angular changes in the direction of image reconstruction due to the variation of flatness of the canvas.

In addition, a hardware read the details, being localized in the field of composition hologram diffraction patterns, are often highly visible because of the relatively large amount of information stored in a controlled laser parts, creating a large angle playback and more dull, like Matt white, the color of the reconstructed image compared with more saturated colors diffraction pattern, which makes evident the presence of additional details. This often leads to deterioration of parts in the manufacture due to the wide range of spatial frequencies in this area, which leads to the nonlinearity of the problems of reproduction and noise in the finished device to store a relatively large amount of information to other systems usually need to combine a large number of different spatial frequencies, which tend to compete, which leads to competition of interference fringes, the saturation of the carrier and, thus, reduce the effectiveness of control is jku each element of the controlled laser message is divided into separate small areas, with a limited number of spatial frequencies, to a much greater extent similar frequencies in the holographic areas, which guarantees ease of manufacture and to minimize deterioration during embossing in the manufacturing process.

In contrast to these previous systems disclosed here, the laser control system has several distinct advantages.

First, each controlled by a separate laser element disclosed system localized in small areas (e.g., points) that minimizes the distortion of the reconstructed image due to insufficient flatness of the base or the roughness of the paper, thereby providing visualized by laser image of higher quality with less deterioration and noise due to surface heterogeneity, more simply controlled by means of coherent light.

Secondly, each element is controlled by the laser contains only a single simple graphic element (for example, letter) as controlled by the laser parts, acting as a component of an entire message. This allows to simplify the microstructure in relation to the width of the range of spatial frequency is frequency, to minimize the competition of interference fringes). This reduction in the required width of the range of spatial frequencies allows you to play in white light visual detail, which looks almost the same as the detail of the diffraction grating, as it provides playback, essentially saturated colors (and not playing dull colors), and also allows for more efficient Tiznit item and make it less sensitive to noise arising in the process of stamping due to saturation of the medium, which occurs more rapidly for lower brightness for more complex optical microstructures.

Third, the localization of a simple graphical element in each controlled by the laser spot, but with the subsequent use of different stains, reproducing in different directions other characters of the message, again, makes the item more resistant to lack of flatness of the surface and the microscopic surface roughness, because it allows to provide good angular and spatial separation of the detail observed with a laser, in order to avoid overlapping.

Fourth, prior placement of controlled laser spots or hotelno time, the conventional laser spot pencil was covered by only one item, bearing a particular character is observed with a laser, thereby ensuring the greatest possible clarity of detail observed with a laser, for each symbol, by eliminating weakly different angles recovery possible in case of several lighting elements, corresponding to the same read by the laser symbol, while repetition is controlled by the laser elements in sets or pairs simplifies alignment and improves readability without precise alignment due to the fact that, for example, non-limiting applications, at any given point in time is illuminated to read only one controlled laser symbol of each type this means that every detail is observed with a laser, is repeated at least once, which makes the item as a whole more sustainable, for example, to local failure, deterioration or surface scratches, thereby improving the quality of laser control of older or creased labels or documents, for example banknotes.

The new system is better protected than with previous systems by improving masking hardware read details protective holograms, and also due to the fact that organia, acts as a diffraction protective details for public recognition. Next follows the explanation of these benefits. Item better hidden in a protective hologram, because, first, it plays a more pure diffraction color than other, previous details observed with a laser, making it difficult to distinguish from other surface diffraction gratings and lenticular parts of the hologram that can effectively mask set and the details that are controlled by the laser. The item can also mask in a protective hologram or in the composition or in the form of spatially separated region as a set of parts or graphical elements, providing detail of apparent motion for public recognition, appear to the observer when the rotation of the hologram, for example rotation, changing shape, changing the image or effect linear movement. Thus, a new security detail acts as a device for public recognition due to the nature of the parts of apparent motion, which can be characterized by methods of the angular separation between controlled laser display according to the different directions of the effect, which provides protective device 20 as a single structure in the form of a point, and the structure is made as part of a line of dots formed by parts of the surface of the diffraction grating in the form of lenticular running strips. When rotating device 21, illuminated with white light 22, the details of the surface of the diffraction grating, comprising the device 20 operate together, providing a display of moving dots. By itself, the device 20 consists of four sections 23-26, which form pairs 23, 25 and 24, 26, thereby providing the user rotates the device, illuminated with white light, a pair of alternating images, these positions 27, 28.

In addition, each sector 23-26 also arranged in such a way that reproduces the corresponding latent image 29, 30 with laser light. As is evident from Fig.5B, a pair of sectors 23, 25 forms a latent image 30, and a pair of sectors 24, 26 forms a latent image 29.

In some cases, the device 20 can be used separately.

Create items of hardware to read the details at the stage of manufacturing the optical microstructure is also difficult compared with the previous devices because it requires the creation of several separate focusi the many different directions of diffraction, ideally, to ensure the effect of apparent motion or effects change shapes when turning, as well as the creation in these areas play separately focused image observed by means of laser, which can be observed only in coherent light. For the formation of this part usually use traditional holographic processes typically transform H1 into H2, and then instead of using a short rainbow crack for designing elementary images, rainbow slit shape desired graphical element that is observed with a laser. Then this process is repeated for each of the multiple graphical elements, each picture combines several parts of the movement and at least two, preferably more, individual controlled laser parts. In practice, the use of 3 or more pairs or sets of individual graphical symbols or points in accordance with the level of complexity of creation and the complexity of the parts controlled by the laser, in which other techniques are beginning to give the worst results, with such a number of different parts, it is advisable to use to create a recognizable and difficult parts of the movement is the R protective devices as necessary.

This is a useful item to prevent counterfeiting using commercially available, so-called "raster" apparatus in which the substrate with the photoresist is exposed to two interfering laser beams for forming a spot of the diffraction grating, and then the pattern speed is moved between the provisions of the document to create an array of diffraction gratings recorded with a computer-controlled step by step and with repetitions (commercially available devices and in literature from, for example, Dimensional Arts and Ahead Optoelectronics Inc.).

Disclosed here is a new protective device is a useful device to prevent counterfeiting in contrast to similar raster systems, as revealed here, the device provides an outwardly simple visual holographic device for public recognition, in which a visual illustration shows a simple moving item for immediate public recognition, and at the same time contains significantly improved hidden protective detail, controlled by the laser, which informed the controller can easily be visualized using a laser pointer and a simple screen to restore and control lagu bitmap, out-of-plane visualized by laser items to be monitored in coherent light, it is impossible to copy using a scanning system, which can ensure the reproduction of the pure diffraction grating (in this case, the preferred form of visual graphic element of the detail observed with a laser, can be either spot or continuous graphic symbol), because any attempt to copy as a visual detail, and the detail observed with a laser, using a raster system would be unacceptably complicated as to copy parts rendered by the laser requires a split single graphic symbol on a separate point, each of which is displayed in different directions, that would be extremely difficult, if not impossible, taking into account the spatial and angular resolution for almost all existing raster systems.

Such reproduction poses a big problem for other means of creating a protective image based on diffraction gratings, for example, based on recombination standard drawings lattice, including "Kinegram", or based on the methods of electron-beam writing, including "abolishionist traditional way equipped with holographic laboratories, since this device is usually component of the protective holographic image that contains many other details.

According to a preferred approach, the device is a holographic method of forming photoresist, creating a surface relief pattern suitable for electroforming metal forms a layer for further manufacture by stamping. For hologram formation, you can use a variant of a known process, H1-H2 antonovskogo type to form a surface relief hologram, in which this device may be combined with 2-/3-dimensional or 3-dimensional hologram or stereogram or any other diffraction grating or diffraction protective device known in the art. When restoring a controlled laser parts using coherent light laser graphic information it contains, receives and focuses or appears on the same plane as Antonovsky rainbow cracks that are recovered in a similar manner, when the visible the main hologram is illuminated by the same source of coherent light.

Surface relief hologram is then copied through the puffs for holographic embossing, which can be used for stamping device known method of replication for holographic or diffractive embossing optical microstructures. Then the device is included in labels, revealing a fake, foil for hot stamping and other similar materials used for mass production of optical protective parts, which can then be attached to protected documents, plastic cards and valuable products.

One aspect of this invention provide its advantages, is that controlled by the laser element responsible to this invention, being recorded as part of a protective holograms, diffraction gratings or similar system always uses the spatial frequency of the diffraction grating carrier, which is less than that of holographic interference patterns. Reading controlled laser parts laser pointer or similar source gives the advantage that, because inexpensive laser sources almost always (to date) are laser devices operating at a wavelength of red, red laser light dirigeret controlled the second division controlled laser items from visual protective holograms to facilitate observation of the controlled laser parts. Therefore, for ease of authentication, it is preferable to record the detail observed with a laser, into a coarse diffraction structure (i.e. in a lattice-media with lower spatial frequency), and then the accompanying visual holographic item that is usually a red laser light defrayal it at a smaller angle than the visual hologram, to provide angular separation. This technique of using a coarse diffraction grating for hidden (for example, a hardware controlled) provides details that are often the least dispersive element of the protective device helps to minimize blurring of the image during recovery due to small changes in the angles of diffraction on different parts of the device, caused by the roughness of the substrate. Therefore, the use of this smaller diffraction angle for controlled laser parts ensures that the diffracted playback of the diffracted renditions controlled by the laser part is the least degraded due to the surface roughness of all the components of a holographic or diffractive security devices.

According Fig. 4, the method of inclusion of this additional apparizioni areas of the original parts for laser control, for example, 3 plots of the original, recorded in 3 areas 60A, 60B, 60C holograms H1, while instead of the usual methods of masking H1 rainbow slit sections H1 mask in the shape of the desired part, controlled by the laser. This H1 can then be used in the well-known sequence of H1-H2 to convert the image controlled by the laser in the image plane of the hologram H2 61 (Fig.4B). Then create, usually in the photoresist containing the plane of the visual image, controlled by the laser part of the hologram H2, animated according to the directions of diffraction, which are determined by the initial composition H1 as controlled by the laser parts. Using the angle of the reference beam, is smaller than any accompanying visual protective hologram or diffraction protective device, guarantees the account controlled by the laser details on the diffraction grating with a larger step than visual diffraction protective device. Subsequently, this image can be combined with visual security hologram, recording the second hologram H2 on the photoresist of the separate H1, relevant visual protective image. Then the wafer with photoresist display the usual JV is to create a single integrated composite H1, containing all of the elements as a visual holograms and laser control areas recorded in some areas, and the hologram H2 is contained in a single conversion step.

Other alternative and equally suitable methods of forming controlled laser parts and 2-/3-dimensional protective holograms can include the use of masks to set the graphic details of the visual image on the hologram in the image plane and the use of vague or diffusing lenticular sheets, masked with the corresponding forms, for forming an object beam with the addition of a separate reference beam according to the prior art.

Another method of manufacturing the image provides a single multiplicium hologram controlled laser parts, copy it on a metal original by electroforming with subsequent use of mechanical methods of recombination (i.e., selective embossing areas using a flatbed machine) to include this detail in the security hologram or purely diffractive device, such as Kinegram or exergame, to increase the security of these devices.

Zam is th microstructure, controlled laser item, such disclosed here can be used in volumetric holographic security device using such recording materials, such as emulsions of silver halides, bahrainwala gelatin and holographic photopolymers (for example, production of E. I. Dupont Holographics Division and the Polaroid Corporation, Holographics Division), using reflective holography, known in the art (for example, G. Saxby, Practical: Holography", Prentice Hall).

In this case, the methods of forming and manufacturing will differ in detail. However, the principle of an improved hidden details observed in the coherent laser light, for multiple small graphic symbols used to obtain the effect of apparent motion for public recognition, remains suitable, i.e. the use of multiple holographic elements having a graphic image in the plane of the visual image intended for visual authentication, in the form of a shape or graphic element, or the graphic figure in out-of-plane parts, forming a controlled laser hidden item, observed only in the light of the laser.

In the examples described above protective peripherals 70 reproduces graphic signs, in this case letters of the NAME, when illuminated with white light usually sequentially as the device is rotated while the laser light 6 is restored signs CODE specified position 71, and in the other plane.

In Fig.7 shows a modified example corresponding to Fig.6, in which the laser light is restored barcode 72 as the latent image by the laser light. Every part of the structure that forms the letters N when illuminated with white light, corresponds to the appropriate section of the bar code 72.

Claims

1. Protective device for protection of documents and other valuable products from illegal reproduction or forgery, containing a holographic structure, generating an optically variable effects, contains at least two separate areas, each of which is arranged to generate, when illuminated with white light, optically variable image, consisting of at least one particular graphical element located in or near the image plane, coincident or adjacent to the plane of the device, and which is made with the possibility for coherent light which is for which is provided by the protective device, in the form of the sign, the image plane which is located at a distance from the physical plane of the device, whereby the latent image is restored at different angles to the normal basis, supporting device, so that the latent images are spatially separated into its plane image, and the latent image is almost invisible when illuminated with white light.

2. The device under item 1, characterized in that the structure of generating optically variable effects, configured to create, when illuminated with white light, optically variable image that moves when you rotate the device.

3. The device under item 1 or 2, characterized in that the structure of generating optically variable effects, made as a single continuous structure.

4. The device according to p. 3, characterized in that each element of the holographic patterns, generating an optically variable effects, has a maximum transverse dimension less than 3 mm and preferably less than 1.5 mm

5. The device under item 3 or 4, characterized in that it contains several pairs or sets of at least three similar sections, each element of a pair of Ilia) element(s) of the pair or set.

6. Device according to any one of paragraphs.3-5, characterized in that a single holographic structure, generating an optically variable effects, is included in the set of additional structures that generate optically variable effects, with a single and advanced structures, generating an optically variable effects made with the possibility of being illuminated with white light, when turning a framework for collaborative action to create the effect of a moving image.

7. The device under item 1 or 2, characterized in that the parts of the structure, generating an optically variable effects, made in the form separated from other areas.

8. The device according to p. 7, characterized in that it contains several pairs or sets of fields, and each element of a pair or set has almost the same design.

9. The device under item 7 or 8, characterized in that each area has a maximum transverse dimension less than 3 mm and preferably less than 1.5 mm

10. Device according to any one of the preceding paragraphs, characterized in that the structure of generating optically variable effects, made in the form of a diffraction grating or holographic patterns, such as protective holograms.

11. The device according to p. 10, otlica the frequency of the grating, what part of the structure, responsive to white light.

12. Device according to any one of the preceding paragraphs, characterized in that the structure of generating optically variable effects, is a surface relief structure.

13. Device according to any one of the preceding paragraphs, characterized in that the latent images contain graphics, alphanumeric characters, marks or device-to-read graphics, such as bar codes.

14. The device according to p. 13, characterized in that each section has a capability of forming a latent image forming part of a device-readable pattern.

15. Device according to any one of the preceding paragraphs, characterized in that the parts have almost the same shape.

16. Device according to any one of the preceding paragraphs, characterized in that the plots have a simple geometrical shape, such as circle, square or rectangle.

17. Device according to any one of paragraphs.1-15, characterized in that the parts are in the form of graphic characters.

18. The device under item 17, characterized in that the sections of the set of alphanumeric characters.

19. Device according to any one of the preceding paragraphs, characterized in that formed g is the men, characterized in that provided with a protective device according to any one of the preceding paragraphs.

 

Same patents:

The invention relates to a device for detecting properties of a sheet material, such as banknotes or securities, using reflected light

The invention relates to a method of control of authenticity of documents and the use of this method

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The invention relates to a structural unit consisting of several parts, having a relief structure of diffraction steps, in particular for visually identifiable optical security elements for valuable documents, for example banknotes, credit cards, certificates, cheques or other securable objects
The invention relates to the field of protection of valuable products from unauthorized reproduction (fakes) and can be used mainly for large-scale production and authorized the reproduction of protected items, such as banknotes and securities, and various types of credit documents

The invention relates to information-measuring technique, and more specifically to devices identify the authenticity of the documents, is equipped with a special optical media encoded information (hologram, diffraction grating, etc.,), and is intended for the analysis of topographic feature located on the document, in compliance with the standard

The invention relates to a device for automatic recognition of diffractive optical label element protection

The invention relates to a protective elements that are placed on documents, such as banknotes, currency, documents or securities, etc. and used to determine the authenticity of documents

The invention relates to storage media with diffraction structures

The invention relates to the field of visually identifiable elements for valuable documents

The invention relates to a structural unit consisting of several parts, having a relief structure of diffraction steps, in particular for visually identifiable optical security elements for valuable documents, for example banknotes, credit cards, identity cards or checks or other securable objects, and one segment of the surface of the structural device provided by the first group of sections with the first diffraction structure of actions and at least one additional group of sections with the additional structure of the diffraction action, different from the first structure, and the parts are of such dimensions that they are not visible to the naked eye

Media // 2150746
The invention relates to storage media recording information, to prevent unauthorized copying and counterfeiting of these carriers
The invention relates to methods for protecting products against counterfeiting

The invention relates to the field of holography, namely, to control the authenticity of the information hidden in the holograms and diffraction gratings, and can be used to control authentication, securities, objects, etc. that bear a hologram with hidden information

Ornament element // 2250500

FIELD: authentication technologies.

SUBSTANCE: element of ornament with visually seen mosaics of some quantity of surface parts, inserted in layer material, consisting of at least transparent cover layer and protective layer, while some portions of surface are made in form of transparent ports, other parts are at least partially overlapped by reflective layer, made in form of mirror surfaces, in form of diffraction-optical surfaces with microscopic relief structures, while portions of surface disperse falling light beams.

EFFECT: higher efficiency.

2 cl, 21 dwg

FIELD: protective system for checking authenticity of valuable documents.

SUBSTANCE: protective system in case of falling light can reconstruct a pattern outside the plane of carrier in holographic way, which pattern contains concealed information. System contains surface, at least partially transparent verification element, which in case of surface contact with protective element allows reading of information stored in it.

EFFECT: higher level of protection from forgery, increased reliability of authenticity check.

9 cl, 8 dwg

FIELD: products marking methods using holograms.

SUBSTANCE: N superimposed three-dimensional reflection holograms are written simultaneously. Mutual incoherence of N objective beams of light is ensured, and the reference beams are formed by mirror reflection of objective beams, which passed through a layer of registering medium.

EFFECT: simplified process of creating protective holograms used for marking products and increased quality of formed marking code images.

2 cl, 2 dwg

FIELD: labels with diffraction barcodes and reading device for information recognition on such labels.

SUBSTANCE: label contains at least one machine-readable diffraction barcode, which consists of narrow rectangular fields and intermediate surfaces covered by optically active structures. Optically active structures covered by reflecting layer are sealed in layers of laminated structure. Relief structure of fields diffracts and polarizes in defined plane the incident light and disperses the diffracted light into half-space above the diffraction relief structure. Other microscopically small optically active structures differ from the diffraction relief structure by at least polarizing capabilities. Polarized back-scattered light can be registered by one of the known standard reading devices for barcodes made by printing technique.

EFFECT: creation of inexpensive machine-readable label with diffraction barcode, which can be read by standard reading devices at a distance of several decimeters.

20 cl, 9 dwg

FIELD: optics.

SUBSTANCE: lamellar structure, used especially for transfer or laminated films, has at least two layers of material disposed one behind other, The structures, turned to observer, have to be transparent or semitransparent. Border surface is formed between layers, which surface is provided at least one part of surface with lens-like structure having property of optical diffraction, which creates reduction of magnification effect. Lens-like structure has to be structure of diffraction pattern which differs continuously at part of surface relatively its frequency of diffraction grating. Structure is made either in form of binary structure or in such a way that some sides of grooves of diffraction grating pass in parallel to each other and approximately in parallel to perpendicular line to main plane of border layer. Angle of other two sides of grooves in relation to perpendicular to main plane of border layer in relation to perpendicular to main plane of border plane essentially changes continuously at part of surface. Depth of grating of lens structures is 10 microns maximum. Efficiency and lightness of created effect and improvement in color effects is provided comparing to structures formed by method of holography.

EFFECT: improved precision; wider variety of construction shapes; higher efficiency.

25 cl, 3 dwg

FIELD: machine building.

SUBSTANCE: diffraction element has a grey-scale image from diffraction structures in the reflection layer, which are placed between a transparent layer and a protective layer of lacquer. The grey-scale image is divided into image elements, with at least one dimension less than 1 mm. The section of each image element is divided into a background image and the sample of the image element. At least through part of the surface of the grey-scale image pass streaks of the sample with a linear sample of thickness ranging from 15 mcm to 300 mcm and partially cover the background field and samples of the image elements. The linear sample is made from a band of the surface with structures of the sample and with thickness of the line in the range from 5 mcm to 50 mcm. The linear samples consist of letters, words, linear elements and pictograms. The structure of the sample differs from the first and second surfaces of the structure, at least, on one parameter of the structure. Thickness of the lines of the band of the surface in background fields is constant. Surface brightness of the image elements through the thickness of the lines of the surface streaks on the image element is controlled in such a way that, part of the area of the sample of the image element, not covered by the linear sample, is determined respectively by the surface brightness of the image of the grey-scale image in the location of the image element and with consideration of surface brightness of adjacent image elements.

EFFECT: provides for making a diffraction protective element, which demonstrates a grey-scale image and which is difficult to imitate or copy.

17 cl, 3 tbl, 10 dwg

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