Printed matter – Having revealable concealed information – fraud preventer or... – Utilizing electromagnetic radiation
Reexamination Certificate
1998-02-02
2001-12-11
Fridie, Jr., Willmon (Department: 3722)
Printed matter
Having revealable concealed information, fraud preventer or...
Utilizing electromagnetic radiation
C283S093000, C283S095000, C428S173000
Reexamination Certificate
active
06328342
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to means for storing information, to methods for creating protective film elements intended to protect valuable documents and other articles from counterfeiting, cleaning, correcting and copying, and also to apparatus for their producing.
DESCRIPTION OF THE RELATED ART
An information carrier in the form of a credit card being a polymer structure which consists of two layers is known V. Belikov. “Electronic money: accumulation, employing, storing, safety”). In this carrier a layer is applied on a polymer structure layer, which has a relief surface and comprises a card owner identification code.
A resolution of modern relief image print types does not exceed 100 mm
−
. Such images defies a direct copying, but it is not too difficult to produce a forgery card having such an image.
An information carrier which is made in the form of a composite material for a stencil print being a polymer structure consisting of two layers is also known (JP, B2 4-67515). One of this carrier's layers is made of a complex polyester or a nylon, and has regularly located recesses equal or greater than 50 &mgr;m (micrometers) in size. Second layer is made of a high-molecular resin.
Said material has a limited resolution that create obstacles for its use in recording and replaying confidential messages.
A maximal progress in the art of recording and replaying high-frequency images is achieved in the field employing holographic and laser methods. These methods find their wide application last 20-30 years.
A method for producing a valuable document, in accordance with which a substrate of a paper or a cardboard is first produced, is know (FR, A1, 76 34289). For providing an optic mark structure causing a diffraction, reflection, or a refraction of falling light, a transparent layer of a layer formed by a printing paint is applied on that substrate, on which layer an information about the validity is written in the form of optic squeeze marks provided by squeezing under a pressure and while heating with a diffraction master lattice or a master hologram.
Also a method for non-repeated indicating articles to prevent their copying or counterfeiting by way of applying a holographic image onto a sheet or a film, introducing this sheet or film into the article or its packing, is known (GB, A1, 2092952). The image may be introduced itself or it may be, for example, a holographic image of an owner or a monarch.
In despite of a high resolution at a current level or a development and spreading of a holographic technology for reproducing and squeezing, it is possible to make a copy with a very accessible means: lasers, holographic stands, moulding devices which are widely produced in various countries. Moreover, with a great number of copies of a valuable papers, it is technically difficult to provide in this number of copes a protection of one paper relative to another within the use of this technology because it doesn't provide an individual protection of a document.
A method for marking documents provided with an individual code in the form of punch which pattern has recognizable irregularities is known. The punch is performed by a laser beam on the basis of a usual pattern, wherein the laser control is performed by a computer in such a way that each punch has an individual irregularity depending on a starting value (DE, A1, 3628353).
By this method it is possible to perform only an issue of a small-numbered article amount since a speed of an every-point laser burning is significantly lower in comparison with techniques for forming marks simultaneously over the whole carrier area. This method has also restrictions on the minimum diameter size of the hole with its maximum depth, which restrictions are connected with a wavelength diffraction limiting of the laser radiation, its power, and a carrier actinism, which is typical for polymer materials.
A method for creating a document protected from the counterfeiting is known, in accordance with which method a reflecting layer is applied onto at least one side of a sheet carrier. Pluralities of grains are applied on the reflecting layer, resulting in that the layer surface has an altering reflectivity (EP, A1, 0155982). Marks formed by pluralities of grains may be read by a machine method.
This highly original method of document protection from counterfeiting has a number of essential limitations in its application. For example, it is difficult to provide a high resolution because of aggregating grains during their grinding and applying, due to rising the image spectrum bandwidth in the lower space frequency area while increasing a dispersity.
Also a method for producing a protective element in the form of a thread or a band incorporated into documents is known (DE, A1, 390669). In accordance with this method, a clouded coating is created on a polymer film, on which coat, in its turn, slots are created in the form of signs and/or patterns. Painting and/or luminescent matters are applied on at least areas coinciding with that slots, owing to which fact those signs and/or patterns become visible on the cloud coating.
In this method the protective element is created by forming transparent slots on the cloud coating, i.e. into the high-frequency nature of the cloud coating image a more low-frequency image in the form of the transparent area is introduced, which may be filled with painting and/or luminescent matters. Thus, this method does not realized a carrier resolution on the level of cloud layer high-frequency properties.
An apparatus for producing information carriers is known V. P. Veiko. “Laser processing of film systems”). Said apparatus comprises a laser, an optical system forming laser beam, a target converted into the information carrier, and target moving device. With the help of this apparatus the information carrier is provided having maximum resolution of 0.5 &mgr;m while the target being of 60 to 200 nm thick, not permitting to protect completely the information from copying.
An apparatus for producing microfilters, which comprises a heavy ion source, a heavy ion stream forming system, and ionguide, and a polymer film irradiated by the heavy ion stream, is known (SU, A, 574044). Upon etching microholes having a diameter greater than 0.01 &mgr;m are occurred in said film. Such a film, which received the name “nuclear filter” is employed only for matters filtering in various fields, for instance, in medicine, biology.
The basis of the present invention is a task of creating the information film carrier to protect documents and articles from counterfeiting and copying, and also the method and the apparatus for its producing, which would permit to enhance the protection degree of documents and articles through the use of individual peculiarities of apparatus for creating the carrier, the high degree of the uniformity in geometric sizes of marks on the carrier, and the high resolution. Therewith a possibility to employ the proposed method in producing many-number copy carrier volume was taken into account.
Furthermore, the given problem includes a possibility to create on one carrier both visible and concealed images located either on one side of the film carrier or on its both sides while storing the concealed image during several years (i.e. till its visualization).
SUMMARY OF THE INVENTION
The given problem is solved by the fact that the information carrier is a film structure which comprises at least one layer of a polymer material having a relief surface formed by recesses and/or through-holes having the form of solids of revolution.
Recesses, through-holes and areas of a destructured polymer material have a diameter in the range of about 0.001 &mgr;m to 20 &mgr;m on the surface of the polymer material and may have the same diameter and different depth.
At least a portion of recesses and through-holes may be filled with an anisotropic material, and/or a transparent, electrical conductive material, and/or a matter having magnetic properties, and/or a colouring matter, and/or hydrophobic or hydroph
Belousov Anton Borisovich
Belousov Boris Ilich
Kim Svyatoslav Eliseevich
Kondratenko Mikhail Julianovich
Fridie Jr. Willmon
Knobbe Martens Olson & Bear LLP
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