EP3433104B1 - Verfahren zum schutz gedruckter daten - Google Patents

Verfahren zum schutz gedruckter daten Download PDF

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Publication number
EP3433104B1
EP3433104B1 EP17712461.7A EP17712461A EP3433104B1 EP 3433104 B1 EP3433104 B1 EP 3433104B1 EP 17712461 A EP17712461 A EP 17712461A EP 3433104 B1 EP3433104 B1 EP 3433104B1
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EP
European Patent Office
Prior art keywords
length
printing
rewinding
plastic card
during
Prior art date
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Active
Application number
EP17712461.7A
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English (en)
French (fr)
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EP3433104A1 (de
Inventor
Didier Godard
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Evolis SA
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Evolis SA
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Publication of EP3433104A1 publication Critical patent/EP3433104A1/de
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J13/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, specially adapted for supporting or handling copy material in short lengths, e.g. sheets
    • B41J13/10—Sheet holders, retainers, movable guides, or stationary guides
    • B41J13/12—Sheet holders, retainers, movable guides, or stationary guides specially adapted for small cards, envelopes, or the like, e.g. credit cards, cut visiting cards
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J17/00—Mechanisms for manipulating page-width impression-transfer material, e.g. carbon paper
    • B41J17/02—Feeding mechanisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/315—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material
    • B41J2/32—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads
    • B41J2/325—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads by selective transfer of ink from ink carrier, e.g. from ink ribbon or sheet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B41M5/382—Contact thermal transfer or sublimation processes
    • B41M5/38207—Contact thermal transfer or sublimation processes characterised by aspects not provided for in groups B41M5/385 - B41M5/395
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B41M5/382—Contact thermal transfer or sublimation processes
    • B41M5/38207—Contact thermal transfer or sublimation processes characterised by aspects not provided for in groups B41M5/385 - B41M5/395
    • B41M5/38221—Apparatus features

Definitions

  • the present invention relates to a method for protecting printed data, as well as to a printer implementing such a method.
  • the transfer film is positioned between the plastic card and the print head.
  • the transfer film and the plastic card to be printed are synchronized with respect to the print head so that said plastic card and a blank area of the transfer film are present simultaneously at the level of the print head. Synchronization is carried out, for example, using position detectors which, among other things, detect the front edge of the plastic card when the plastic card advances towards the print head.
  • the print head heats the transfer film according to the characters to be printed, which results in the transfer of the ink from the transfer film to the plastic card.
  • the plastic card and the transfer film simultaneously advance under the print head in order to print the card plastic and the transfer film is gradually rolled up on the recovery roller.
  • An object of the present invention is to provide a protection method which protects the data which is on the transfer film after printing.
  • the protection method includes a looping step during which the subsequent printing step loops on the rewinding step.
  • the protection method comprises between the rewinding step and the subsequent printing step, a formatting step during which, if the rewinding length is less than the previous printing length, the part of the text original which extends at the end of the text over a length equal to the difference between the print length and the rewind length is deleted, and if the rewind length is greater than the print length, the part original text that extends at the beginning of the text over a length equal to the difference between rewind length and print length is removed.
  • the first printing step is accompanied by a counting sub-step during which the number N 0 of pulses generated during the first printing is counted, and during which a corresponding number of pulses at the rewinding length is calculated
  • the rewinding step is accompanied by a counting sub-step during which the number of pulses generated during the rewinding is counted and during which the rewinding stops when said number of pulses has reached the number of pulses corresponding to the rewinding length calculated previously.
  • the processor is arranged to, if the rewinding length is less than the previous printing length, delete the part of the original text which extends at the end of the text over a length equal to the difference between the length and the rewind length, and for, if the rewind length is greater than the print length, delete the part of the original text that extends at the beginning of the text by a length equal to the difference between rewind length and print length.
  • the supply system 102 and the ejection system 104 are not described further, since all known types of systems using motorized drive rollers can be used.
  • the transfer film 12 is positioned between the plastic card 10 and the print head 112.
  • the general operating principle of the printer 100 is identical to the operating principle of a prior art printer.
  • a plastic card 10 is picked up by the supply system 102 and driven to the print head 112, which heats the transfer film 12 according to the data to be printed, then when the data is printed on the plastic card 10, the card plastic 10 is supported by the ejection system 104 which ejects the plastic card from the printer 100.
  • the plastic card 10 and the transfer film 12 both move in the same printing direction 250.
  • the plastic card 10 when it is to be printed, it is synchronized with respect to the print head 112, with an area of the transfer film 12 which is blank, that is to say which has not yet passed. under the print head 112.
  • the transfer film 12 is driven during printing by a motor with which the recovery roller 110 is fitted and which drives said recovery roller 110 in a direction of winding 14 of the transfer film 10 on the roller recovery 110.
  • the printer 100 also includes a rewinding motor 150 which is designed to drive the supply roller 108 in a direction of winding 16 of the transfer film 10 on the supply roller 108.
  • the transfer film 12 is then driven in the opposite direction to the printing direction 250.
  • the rewinding motor 150 acts here by means of a belt 154 installed between the shaft of the rewinding motor 150 and the shaft supply roller 108.
  • the printer 100 also includes an angular encoder 152 mounted on the supply roller 108 and which makes it possible to count the number of degrees by which the supply roller 108 rotates during printing.
  • This angle encoder 152 can take different forms such as, for example, a set of teeth fixed or holes on the supply roller 108 and arranged on the periphery of a circle coaxial with the axis of rotation of the supply roller 108, and an optical sensor which counts the number of teeth or holes passing in front of it during printing.
  • This angular encoder 152 can also be a magnetic encoder.
  • the angular encoder 152 conventionally delivers information relating to the number of pulses generated during rotation, the pulses are generated by magnetic or optical elements as described above.
  • the printer 100 also includes displacement means 160 for displacing the plastic card 10 relative to the print head 112, from upstream to downstream (printing direction 250) and vice versa.
  • the displacement means 160 here take the form of rollers which bear against the upper face and the lower face of the plastic card 10 and which comprise a motor provided for driving the rollers in one direction or the other.
  • the plastic card 10 moves from the supply system 102 to the ejection system 104 (printing direction 250) or vice versa.
  • These or some of these rollers can be part of the supply system 102 and the ejection system 104 according to their positions relative to the print head 112.
  • the Fig. 2 shows a control unit 200 of the printer 100.
  • the control unit 200 comprises, connected by a communication bus 202: a processor 204 or CPU ("Central Processing Unit” in English), a random access memory RAM 206 (" Random Access Memory “in English), ROM 208 (" Read Only Memory "), at least one communication interface 210 of the Input / Output type, allowing the control unit 200 to communicate with the various motors , the print head 112 and the various sensors of the printer 100, and possibly a storage unit 212 such as a hard disk or a reader of storage medium, such as an SD card reader (“Secure Digital " in English).
  • a storage unit 212 such as a hard disk or a reader of storage medium, such as an SD card reader (“Secure Digital " in English).
  • Processor 204 is capable of executing instructions loaded into RAM 206 from ROM 208, external memory (not shown), storage medium (such as an SD card), or a communication network. When the printer 100 is powered up, the processor 204 is able to read instructions from RAM 206 and execute them. These instructions form a computer program causing the implementation, by the processor 204, of all or part of the algorithms and steps described below.
  • All or part of the algorithms and steps described below can be implemented in software form by execution of a set of instructions by a programmable machine, for example a DSP ("Digital Signal Processor” in English) or a microcontroller, or be implemented in hardware form by a dedicated machine or component, for example an FPGA (“Field-Programmable Gate Array” in English) or an ASIC (“Application-Specific Integrated Circuit” in English).
  • a programmable machine for example a DSP ("Digital Signal Processor” in English) or a microcontroller
  • FPGA Field-Programmable Gate Array” in English
  • ASIC Application-Specific Integrated Circuit
  • the Fig. 3 shows examples of prints which are made during the printing of a plastic card 10 by the printer 100.
  • the elements bearing the references 302a-c represent the plastic card 10 on which the text to be printed is printed at different stages of printing.
  • the elements bearing the references 304a-c represent the transfer film 12 with the part of the ink which disappeared after printing.
  • the elements bearing the references 306b-c show the transfer film 12 on which one of the prints has been fictitiously shifted transversely relative to the printing direction 250 to facilitate understanding of the invention.
  • the plastic card 10 passes under the print head 112, it is printed (302a) for the first time with the data transmitted by the processor 204 to the print head 112.
  • the data is the text “ 1234 5678 9012 3456 ".
  • the ink corresponding to the text is removed from the transfer film 12 and the text appears in negative (304a). Following this first impression, the text appears in clear on the transfer film 12 on line 308a.
  • the plastic card 10 is repositioned upstream of the printing head 112 by the displacement means 160 by displacement in a reverse direction 350 to the printing direction 250.
  • the film of transfer 12 is rewound in the reverse direction 350 on the supply roller 108 by the rewinding motor 150.
  • the rewinding is carried out with an offset d 1 in one direction or the other relative to the reverse direction 350 (here the offset is in the direction of the printing direction 250, that is to say that the transfer film 12 has been rewound less than what was necessary to make the first printing).
  • the same plastic card 10 is then synchronized with respect to the print head 112 for a new printing of the same text or of part of the same text.
  • the printing, in the printing direction 250, of the new line of text is carried out on the plastic card 10, and the new line of text is superimposed on the line of text already printed on the plastic card 10 (302b) .
  • Line 308b represents the ink line which disappeared from the transfer film 12 during printing, it appears in negative.
  • lines 308a-b overlap in a line 310b which represents what actually appears on the transfer film 12 which is then illegible.
  • the characters (here 5 and 6) which are offset are deleted by the processor 204, here over a length corresponding to the offset d 1 . Furthermore, such a deletion makes it possible to enhance the illegibility of the text, in particular of the end of the text.
  • the plastic card 10 is repositioned upstream of the printing head 112 by the displacement means 160 by displacement in a reverse direction 350 to the printing direction 250.
  • the film of transfer 12 is rewound in the reverse direction 350 on the supply roller 108 by the rewinding motor 150.
  • the rewinding is carried out with an offset d 2 in one direction or the other relative to the reverse direction 350 (here the offset is in the direction of the reverse direction 350, that is to say that the transfer film 12 has been rewound more than was necessary to make the second impression).
  • the same plastic card 10 is then synchronized with respect to the print head 112 for a new printing of the same text or of part of the same text.
  • the printing, in the printing direction 250, of the new line of text is carried out on the plastic card 10, the new line of text is superimposed on the line of text already printed on the plastic card 10 (302c).
  • Line 308c represents the ink line which disappeared from the transfer film 12 during printing, it appears in negative.
  • lines 310b and 308c overlap in a line 310c which represents what actually appears on the transfer film 12 which is then even more unreadable.
  • the characters (here 1 and 2) which are shifted below the start of the text can be deleted by the processor 204, here over a length corresponding to the offset d 2 , in order to reinforce the illegibility of the text, in particular the beginning of the text.
  • each offset d 1 , d 2 must be small enough to prevent too much of the text from being readable.
  • the offset d 1 is of the order of two characters, which keeps the readability of the first two characters.
  • Each offset is preferably between the width of 0.5 characters and the width of 2.5 characters, which corresponds substantially to a width between 1.5 and 7.5 mm for characters with a height of 3 mm and 3 mm spacing such as OCR A Extended font size 14.
  • a different offset can be used.
  • each offset d 1 , d 2 may be a predefined value at construction, or a value generated by the processor 204 at each printing as a function of the height of the characters or of any other variables.
  • each length is obtained after a certain number of motor pulses which make it possible to obtain this length.
  • the length of displacement due to an impulse from a motor is known by construction, and depends inter alia on the motor, on the gears between the motor and the roller, and the diameter of the roller which makes it possible to drive the plastic card 10 or the film. transfer 12.
  • the processor 204 receives information from the angular encoder 152, this information, which conventionally corresponds to a number of pulses, represents the number of degrees that the supply roller 108 performs during printing.
  • the processor 204 can then calculate the ratio between the number of pulses N 0 and the length Lo of transfer film 12 having been unwound to print the text the first time, this ratio makes it possible to take account of the diameter of the transfer film 12 on the supply roller 108 since the number of pulses for a length varies as a function of said diameter.
  • the length Lo is preferably greater or equal to the length of the text to be printed, in particular the length Lo is sufficient to pass at least the entire plastic card 10 under the print head 112.
  • the processor 204 can then determine the numbers of pulses corresponding to the lengths of the shifts d 1 and d 2 which are respectively d 1 ⁇ NOT 0 L 0 and d 2 ⁇ NOT 0 L 0 .
  • the processor 204 then controls the rewinding motor 150 so as to rewind the transfer film 12 while counting the number of pulses generated by the angular encoder 152 and stops the rewinding motor 150 when the number of pulses thus recorded is equal as the case may be NOT 0 - d 1 ⁇ NOT 0 L 0 or NOT 0 + d 2 ⁇ NOT 0 L 0 .
  • the print head 112 is raised and therefore moved away from the plastic card 10 before rewinding and it is lowered at the end of the rewinding.
  • the printer 100 has an elevator 170 to which the print head 112 is fixed and which is arranged to raise and lower the print head 112.
  • the elevator 170 controlled by the processor 204 can take different forms such as for example a motor with a cam, an electromagnet ...
  • clutch is arranged to transmit a force from the rewinding motor 150 to the supply roller 108 and prevent the transmission of forces from the supply roller 108 to the rewinding motor 150.
  • This clutch can be electric and controlled by the processor 204 or be mechanical of the clutch spring type.
  • the advance of the transfer film 12 during the first printing step 402 and the subsequent printing step 408 is carried out by the motor associated with the recovery roller 110 which is controlled by the processor 204.
  • the simultaneous advancement of the plastic card 10 during the first printing step 402 and the subsequent printing step 408 is carried out by the motor of the displacement means 160 which is controlled by the processor 204.
  • the rewinding of the transfer film 12 is carried out by the rewinding motor 150 which is controlled by the processor 204.
  • the return of the plastic card 10 during the rewinding step 404 is carried out by the motor of the means displacement 160 which is controlled by processor 204.
  • Such a method makes it possible to offset the text which is in negative on the transfer film 12 with each printing, so that the same text is superimposed at least twice in an offset manner in the printing direction 250.
  • the process can continue with an ejection step 410 during which the processor 204 controls the advancement of the plastic card 10 to the ejection system 104 where the card plastic 10 is expelled from printer 100.
  • the process can loop (412) on the rewinding step 404 in order to perform a further subsequent printing step 408 with a different offset.
  • the number of loops 412 can be configured in processor 204, for example as a function of a degree of confidentiality to be achieved.
  • the rewinding length is equal to L 0 -d 1 and the other printing length is at least equal to L 0 -d 1 .
  • This length varies in particular depending on whether the last two characters are kept or removed, and whether another subsequent printing is carried out or whether the plastic card 10 is ejected.
  • the other printing length varies as a function of the offset applied, whether the plastic card 10 is ejected or not.
  • the other printing length is preferably sufficient to pass at least all of the plastic card 10 under the printing head 112.
  • the rewinding length will be determined by the processor 204 so that there is an overlapping of the prints on the transfer film 12.
  • the transfer film 12 has been rewound by a length Lo relative to to its previous position (302b).
  • the new other printing length also depends on this new rewinding length and whether or not the plastic card 10 is ejected.
  • the processor 204 deletes the part of the text which extends at the end of the text over a length equal to the offset d 1
  • the processor 204 deletes the part of the text which extends at the beginning of the text over a length equal to the offset d 2 .
  • the protection method 400 then comprises, between the rewinding step 404 and the subsequent printing step 408, a formatting step 406 during which, if the rewinding length is less than the previous printing length, the processor 204 deletes the part of the original text that extends at the end of the text over a length equal to the difference between the print length and the rewind length, and if the rewind length is greater than the length d printing, the processor 204 deletes the part of the original text which extends at the beginning of the text over a length equal to the difference between the rewinding length and the printing length, the text thus modified constitutes the text printed subsequently .
  • This formatting step is applied before each print depending on the offset applied and the different offsets previously applied.
  • the rewinding step 404 is then accompanied by a counting sub-step during which the processor 204 counts the number of pulses generated by the angular encoder 152 during the rewinding and stops the rewinding when the said number of pulses has reached the number of pulses corresponding to the rewinding length calculated previously.
  • the processor 204 takes these values into account to calculate the number of pulses to be counted in order to obtain the desired length.
  • the protection method 400 includes a raising step during which the processor 204 controls the lifting of the print head 112, and between each step of rewinding and each printing step, the protection method 400 includes a lowering step during which the processor 204 controls the lowering of the print head 112.
  • the protection method 400 Before the first printing step 402, the protection method 400 conventionally includes a supply step during which the processor 204 controls the supply system 102 to supply the printing module 106 with a plastic card 10 to be printed .
  • the invention has been more particularly presented in the case where the ink of the transfer film is completely transferred during the heating of the print head, it also applies in the case of a sublimation printing, where the amount of transfer film ink that is transferred depends on the temperature of the print head.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Electronic Switches (AREA)

Claims (6)

  1. Verfahren zum Schutz (400) gedruckter Daten auf einer Transferfolie (12) eines Thermotransferdruckers (100) für eine Kunststoffkarte (10), der einen Druckkopf (112) umfasst, wobei das Schutzverfahren (400) umfasst:
    - einen ersten Druckschritt (402), während dessen die Transferfolie (12) und die Kunststoffkarte (10) gleichzeitig über eine Drucklänge Lo unter dem Druckkopf (112) vorwärts laufen und während dessen der Druckkopf (112) gemäß dem zu druckenden Text aufheizt,
    - einen Rückspulschritt (404), während dessen die Transferfolie (12) über eine Rückspullänge Lo+/-d, die verschieden von der Drucklänge Lo ist, zurückgespult wird und während dessen die Kunststoffkarte (10) stromauf des Druckkopfes (112) zurückgeführt wird,
    - einen weiteren Druckschritt (408), während dessen die Transferfolie (12) und die Kunststoffkarte (10) gleichzeitig über eine andere Drucklänge unter dem Druckkopf (112) vorwärts laufen und während dessen der Druckkopf (112) gemäß dem zu druckenden Text aufheizt, und
    - einen Auswurfschritt (410), während dessen die Kunststoffkarte (10) aus dem Drucker (100) ausgestoßen wird.
  2. Schutzverfahren (400) nach Anspruch 1, dadurch gekennzeichnet, dass es einen Schleifenbildungsschritt (412) umfasst, während dessen der weitere Druckschritt (408) auf den Rückspulschritt (404) zurückgeschleift wird.
  3. Schutzverfahren (400) nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, dass es zwischen dem Rückspulschritt (404) und dem weiteren Druckschritt (408) einen Formatierungsschritt (406) umfasst, während dessen, wenn die Rückspullänge kleiner als die vorausgegangene Drucklänge ist, der Teil des ursprünglichen Textes, der sich am Ende des Textes über eine Länge gleich der Differenz zwischen der Drucklänge und der Rückspullänge erstreckt, gelöscht wird und, wenn die Rückspullänge größer als die Drucklänge ist, der Teil des ursprünglichen Textes, der sich am Anfang des Textes über eine Länge gleich der Differenz zwischen der Rückspullänge und der Drucklänge erstreckt, gelöscht wird.
  4. Schutzverfahren (400) nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass der erste Druckschritt (402) mit einem Zähl-Teilschritt einhergeht, während dessen die Anzahl N0 der beim ersten Drucken erzeugten Impulse erfasst wird und während dessen eine Anzahl von Impulsen, die der Rückspullänge entspricht, berechnet wird, und dadurch, dass der Rückspulschritt (404) mit einem Zähl-Teilschritt einhergeht, während dessen die Anzahl der beim Rückspulen erzeugten Impulse erfasst wird und während dessen das Zurückspulen stoppt, wenn die Anzahl von Impulsen die Anzahl von Impulsen erreicht hat, die der zuvor berechneten Rückspullänge entspricht.
  5. Thermotransferdrucker (100), umfassend:
    - ein Zuführsystem (102), das es ermöglicht, dem Drucker (100) eine Kunststoffkarte (10) zuzuführen,
    - eine Zuführwalze (108), auf die eine Transferfolie (12) aufgewickelt ist, die eine Schicht aufzubringender Tinte trägt,
    - eine Rückführwalze (110), auf welche die Transferfolie (12) aufgewickelt wird, nachdem die Tintenschicht auf eine Kunststoffkarte (10) appliziert worden ist,
    - einen Druckkopf (112) zwischen der Zuführwalze (108) und der Rückführwalze (110),
    - ein Auswurfsystem (104), das es ermöglicht, die Kunststoffkarte (10) nach dem Bedrucken aus dem Drucker (100) auszuwerfen, und
    - einen Prozessor (204), der dazu eingerichtet ist:
    - das gleichzeitige Vorwärtslaufen der Transferfolie (12) und der Kunststoffkarte (10) über eine Drucklänge L0 unter dem Druckkopf (112) und das Aufheizen des Druckkopfes (112) entsprechend dem zu druckenden Text zu steuern,
    - das Zurückspulen der Transferfolie (12) über eine Rückspullänge L0+/-d, die verschieden von der Drucklänge Lo ist, und das Zurücklaufen der Kunststoffkarte (10) stromauf des Druckkopfes (112) zu steuern,
    - das gleichzeitige Vorwärtslaufen der Transferfolie (12) und der Kunststoffkarte (10) über eine andere Drucklänge unter dem Druckkopf (112) und das Aufheizen des Druckkopfes (112) entsprechend dem zu druckenden Text zu steuern, und
    - das Vorwärtslaufen der Kunststoffkarte (10) bis zum Auswurfsystem (104) zu steuern.
  6. Drucker (100) nach Anspruch 5, dadurch gekennzeichnet, dass der Prozessor (204) dazu eingerichtet ist, wenn die Rückspullänge kleiner als die vorausgegangene Drucklänge ist, den Teil des ursprünglichen Textes, der sich am Ende des Textes über eine Länge gleich der Differenz zwischen der Drucklänge und der Rückspullänge erstreckt, zu löschen und, wenn die Rückspullänge größer als die Drucklänge ist, den Teil des ursprünglichen Textes, der sich am Anfang des Textes über eine Länge gleich der Differenz zwischen der Rückspullänge und der Drucklänge erstreckt, zu löschen.
EP17712461.7A 2016-03-25 2017-03-20 Verfahren zum schutz gedruckter daten Active EP3433104B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1652622A FR3049216B1 (fr) 2016-03-25 2016-03-25 Procede de protection de donnees imprimees
PCT/EP2017/056588 WO2017162601A1 (fr) 2016-03-25 2017-03-20 Procede de protection de donnees imprimees

Publications (2)

Publication Number Publication Date
EP3433104A1 EP3433104A1 (de) 2019-01-30
EP3433104B1 true EP3433104B1 (de) 2020-03-18

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EP17712461.7A Active EP3433104B1 (de) 2016-03-25 2017-03-20 Verfahren zum schutz gedruckter daten

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Country Link
US (1) US10427429B2 (de)
EP (1) EP3433104B1 (de)
CN (1) CN109153268B (de)
FR (1) FR3049216B1 (de)
WO (1) WO2017162601A1 (de)

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* Cited by examiner, † Cited by third party
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EP3814148A4 (de) 2018-06-04 2022-05-11 Entrust Corporation Maskierung von restbildern auf druckbändern
CN109840568A (zh) * 2018-12-14 2019-06-04 江门市得实计算机外部设备有限公司 可视信息加密方法、装置、设备及计算机可读储存介质
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US10427429B2 (en) 2019-10-01
US20190084322A1 (en) 2019-03-21
FR3049216B1 (fr) 2018-04-20
CN109153268B (zh) 2020-07-10
EP3433104A1 (de) 2019-01-30
WO2017162601A1 (fr) 2017-09-28
FR3049216A1 (fr) 2017-09-29
CN109153268A (zh) 2019-01-04

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