Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
  • B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
  • B41M3/14—Security printing
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
  • G03C5/00—Photographic processes or agents therefor; Regeneration of such processing agents
  • G03C5/08—Photoprinting; Processes and means for preventing photoprinting

Definitions

• the invention relates to a method for marking original prints to distinguish them from copies.
• warning markings that are not visually visible, because they are of the same color and density of the background and are overlaid by other prints or patterns (DE-OS 34 19 859).
• the warning marks are only visible in the copy.
• the invention had for its object to provide a security method for the latter purposes of directly printing value stamps on various printing templates, which makes copies of the original prints or forgeries recognizable.
• This object is achieved in that fine markings which are invisible to the eye and which cannot be reproduced by commercially available copiers are also printed in the original print.
• Fine markings such as lines, grids or patterns, which are not visible to the eye, are also printed in the original. These markings can only be recognized with the help of optical devices, e.g. B. magnifying glasses. They are therefore invisible to any normal copier and cannot be reproduced. This makes it easy to check if the counterfeit is suspected or if a copy is deliberately given as an original.
• the markings are preferably generated via the printing device. So in a simple way in any fineness such markings on the printer control, for. B. a printhead in franking machines.
• Another variant of the production of invisible markings is their introduction into or onto the material to be printed before printing.
• this can be done by a corresponding printing unit for fine markings.
• the print template is already provided with appropriate markings during its manufacture, for example in the case of envelopes or special paper strips for strip dispensers of franking and / or stamping machines within the paper substrate.
• Another variant is the introduction of the markings into the ribbon.

Landscapes

• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Credit Cards Or The Like (AREA)
• Accessory Devices And Overall Control Thereof (AREA)
• Combination Of More Than One Step In Electrophotography (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=6375514

Family Applications (1)

Country Status (2)

Family Cites Families (12)

• 1989
  • 1989-03-02 DE DE19893906944 patent/DE3906944A1/de not_active Ceased
• 1990
  • 1990-02-12 EP EP19900102718 patent/EP0385171A3/fr not_active Withdrawn

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