Classifications

• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
  • G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
  • G03G21/04—Preventing copies being made of an original
  • G03G21/043—Preventing copies being made of an original by using an original which is not reproducible or only reproducible with a different appearence, e.g. originals with a photochromic layer or a colour background
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
  • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
  • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
  • D21H21/40—Agents facilitating proof of genuineness or preventing fraudulent alteration, e.g. for security paper
  • D21H21/44—Latent security elements, i.e. detectable or becoming apparent only by use of special verification or tampering devices or methods
  • D21H21/48—Elements suited for physical verification, e.g. by irradiation
• • G—PHYSICS
  • G07—CHECKING-DEVICES
  • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
  • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
  • G07D7/003—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using security elements
  • G07D7/0032—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using security elements using holograms

Definitions

• the invention relates to a security element according to the preamble of claim 1.
• security papers In the production of paper for banknotes, checks, passports, hereinafter referred to briefly as security papers, it corresponds to the state of the art to introduce so-called security threads into the paper. These are narrow tapes made of plastic or metal or any composite materials that are embedded in the paper sheet during the manufacturing process of the paper. Such security threads can be recognized on the finished sheet in transmitted light in accordance with their nature and serve to authenticate the corresponding paper.
• the object of the present invention is now to provide a security element which on the one hand can be recognized as an authenticity feature in a corresponding security paper, but which on the other hand is also used for protection against unauthorized copying can be.
• Such a security element the z. B. may have the form of a security thread embedded in the document, would produce such a clear effect in the attempt to make a copy on this copy that it could no longer be repaired in the sense of the original.
• the deflected, in particular diffracted, beam is on the one hand perpendicular to the thread running direction, but on the other hand forms a given angle to the normal to the thread surface. If one looks at a document containing such a thread, no special effects can be seen with normal observation, ie, observation directed perpendicular to the surface. When the document is held at an angle (the thread advantageously being regarded as an axis for the inclination), bright light reflections appear at defined angles, but these disappear again when the document is inclined further. When the document is moved quickly around the thread axis, a brief flash of the deflected light rays appears. This property of the security thread can advantageously be used as an authenticity feature, since it is not possible, in particular with simple means, to subsequently cause such an appearance on a counterfeit or copy.
• a thread of the type according to the invention shows particularly advantageous properties when an attempt is made in a copier (irrespective of whether black and white or color) to reproduce the document by unauthorized copying.
• a gas discharge tube or the like is used to illuminate the template.
• the light reflected from the original is imaged by a photographic object on a photoconductive drum and a charge image of the original is generated there.
• Subsequent use of toners and transfer to any substrate results in a copy of the given template.
• the security element according to the invention located in or on the document has the effect of affecting the surface of the security element falling light rays are not diffusely scattered, but a reflective metal layer initially creates a black image at this point.
• a bank note is equipped with the thread according to the invention and it is further provided that this thread comes out of the bank note at at least one point on the surface of the note, the first embodiment of the method according to the invention results.
• a banknote usually has a linear background print that covers almost the entire surface of the note. If you now try to copy such a note, there is a dark place in the copy where the exposed thread would otherwise be recognizable. In addition, however, one or more clearly visible interruptions can be found in the area of linear background printing. This copy is therefore easily recognized as a forgery.
• the security thread can also be produced in such a way that recognizable or readable information is contained within the light beam bent to the side due to the special design of the surface structure.
• a black cross or another suitable sign can also arise within the copy, which improves the recognizability of the copy and additionally hinders the secondary improvement of such a copy.
• a suitable method consists, for example, of holographically imaging a light source at an oblique angle of incidence and producing an embossing stamp in a known manner on the basis of this hologram. If one stamps the surface of a metallized plastic filament with such a stamp, the result is, in principle, an image of the previously recorded topography, that is to say a light source radiating in a defined manner at a certain angle. This means that incident light rays leave the surface of the film at a defined angle and thus produce the effects described above.
• any directional reflective embossing can be used, which only takes into account the different orientation options of the original in the copier. For example, four to eight reflections grouped at a defined angle symmetrically around the normal of the thread can provide excellent security for documents in these devices.
• an annular retroreflection which is mounted on the security thread as a cone jacket around the normal. Such overexposure would then result in annular extinguishments of the print around the thread.
• a number of copiers use line-by-line scanning of the original, eliminating the need for a photoconductive drum. Rather, a line consisting of many light-sensitive points slides over the original, which scans the image across the direction of travel of the line. It is understood that such imaging systems are only disturbed if at least one of the reflections falls into one of the light-sensitive sensor points. This means that the previously described direction of reflection in a circle along a conical surface would already be a perfect safeguard. Likewise, the relexes along the cone can also be divided into a group of individuals Decompose points so that a sufficiently large number of point-shaped reflected light bundles are created along a circle in the illustration. These would then outshine at least one point each when scanning (but generally two points due to their symmetrical arrangement). By moving the sensor line, these points would add up to two bright lines along the direction of movement of the sensor.

Landscapes

• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Engineering & Computer Science (AREA)
• Computer Security & Cryptography (AREA)
• Credit Cards Or The Like (AREA)
• Holo Graphy (AREA)
• Bidet-Like Cleaning Device And Other Flush Toilet Accessories (AREA)
• Facsimile Transmission Control (AREA)
• Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)
• Printing Methods (AREA)
• Cleaning In Electrography (AREA)

Applications Claiming Priority (2)

Publications (2)

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ID=6369747

Family Applications (1)

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Cited By (3)

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Citations (3)

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• 1988
  • 1988-12-21 DE DE3843076A patent/DE3843076A1/de not_active Ceased
• 1989
  • 1989-12-20 EP EP89123585A patent/EP0377167B1/fr not_active Expired - Lifetime
  • 1989-12-20 AT AT89123585T patent/ATE111171T1/de not_active IP Right Cessation
  • 1989-12-20 DE DE58908323T patent/DE58908323D1/de not_active Expired - Fee Related

Patent Citations (3)

Non-Patent Citations (1)

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