EP1040926B1 - Procédé d'impression mangnétographique - Google Patents

Procédé d'impression mangnétographique Download PDF

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Publication number
EP1040926B1
EP1040926B1 EP00400733A EP00400733A EP1040926B1 EP 1040926 B1 EP1040926 B1 EP 1040926B1 EP 00400733 A EP00400733 A EP 00400733A EP 00400733 A EP00400733 A EP 00400733A EP 1040926 B1 EP1040926 B1 EP 1040926B1
Authority
EP
European Patent Office
Prior art keywords
points
recording
magnetised
leading edge
image
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP00400733A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1040926A1 (fr
Inventor
Pascal Brechat
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.)
Xeikon France SA
Original Assignee
Xeikon France SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Publication of EP1040926A1 publication Critical patent/EP1040926A1/fr
Application granted granted Critical
Publication of EP1040926B1 publication Critical patent/EP1040926B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/385—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective supply of electric current or selective application of magnetism to a printing or impression-transfer material
    • B41J2/43—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective supply of electric current or selective application of magnetism to a printing or impression-transfer material for magnetic printing

Definitions

  • the present invention relates to the field of impactless magnetographic printers and more particularly to the printing methods used in such printers.
  • Magnetographic printers include a magnetic recording element which is in various forms such as, for example, a drum, tape or disc.
  • the magnetic recording element consists of a support coated with a layer of magnetic material. Recording information on this element is achieved using at least one recording device, called module.
  • the module has at least one elementary magnetic recording head near which the recording element moves.
  • the elementary recording head is generally constituted by an electromagnet.
  • Each of the elementary heads generates, each time it is excited by an electric current of determined intensity, a magnetic field which has the effect of creating, on the surface of the recording element which passes in front of these elementary heads, magnetized domains of small dimensions. These virtually punctual magnetized domains are generally referred to as magnetized registration points.
  • the surface portion of the element that passes in front of each head is usually referred to as information recording tracks.
  • Magnetized recording points located on the same recording track and preceded in the scrolling direction of the element for recording at least one registration point that has not been magnetized belong to a set of magnetized registration points called the leading edge.
  • the juxtaposition of the recording points forms an image.
  • Magnetic ink particles are then attracted by the magnetized recording points on the recording element.
  • a paper to be printed is pressed against the recording element.
  • the magnetic ink particles are transferred and fixed onto the paper: the image formed by the recording points on the drum is transferred using the magnetic ink particles onto the paper.
  • US Patent 4,414,554 teaches a method and apparatus in an electromagnetic printer for producing a magnetic image in which magnetized areas have a high toner holding capacity.
  • the apparatus used comprises a particular and complex magnetic head, necessary to generate a particular magnetic field whose magnetic field vectors are arranged according to a spherical geometry.
  • An object of the present invention is to improve the homogeneity of the final image.
  • Another object of the present invention is to perfect the inking of the magnetized points of the leading edge while avoiding spending more energy to do this.
  • Another object of the invention is to improve the efficiency of printing, namely the ratio between the optical density of an inked magnetic point and the energy required to magnetize the point concerned.
  • the present invention provides a magnetographic printing method of creating magnetized recording points on a surface of a magnetic recording element (3) receiving a quantity of energy by means of at least one elementary magnetic head (2) controlled by at least one control pulse, to project ink particles onto each of the magnetized recording points each corresponding to an image point so as to form at least one image, the recording points magnetized and inked being called revealed points, characterized in that it consists in detecting the image points of the leading edge and in increasing the quantity of energy supplied at least at the corresponding magnetized recording points, relative to the amount of energy supplied to the other magnetized recording points, to enhance the optical density of the revealed points belonging to the leading edge.
  • the present invention also relates to a magnetographic printer comprising at least one elementary magnetic head (2) capable of creating magnetized recording points on a surface of a magnetic recording element (3), means (5) for controlling the magnetic recording element.
  • the elementary magnetic head (2) means for projecting ink particles onto each of the magnetized recording points so as to form images consisting of image points, characterized in that it comprises means for detecting the leading edge in connection with the control means (5) and means for increasing the energy supplied at least at the magnetized recording points of the leading edge with respect to the energy supplied to the other recording points magnetized.
  • the present invention relates to a magnetographic printing method and a magnetographic printer implementing the method.
  • the magnetographic printer according to the invention comprises at least one elementary magnetic head 2 placed near the surface of a magnetic recording element 3.
  • the elementary magnetic head is in the form of an electromagnet.
  • the element 3 is constituted in the embodiment described and illustrated in the drawings by a rotating magnetic drum.
  • the element 3 could be in any other form such as for example a magnetic endless belt.
  • the drum 3 is rotated on itself by an electric motor in a direction indicated in the drawings by the letter S.
  • the surface portion of the drum 3 which passes in front of each head is called the recording track 4 (see FIG. ).
  • the elementary head 2 receives electrical signals representative of data sent by a control unit 5 represented by a black box in FIG.
  • the elementary magnetic heads perform the recording of the data received from the unit 5 in the form of recording points 6 on the drum 3.
  • the electrical signals of the unit 5 consist of current pulses I transmitted to the elementary magnetic head 2.
  • the magnetic field induced by the pulses creates on the surface of the drum 3 which passes in front of the heads 2 of the magnetized recording points 6 shown in FIGS. 2, 3, 6 to 9.
  • a recording point magnetized is formed.
  • the set of recording points on the magnetic recording surface of the drum 3 corresponds to the image that it is desired to print on a paper.
  • the image comes in various forms, drawings, string, photo ... or any other form that can be reproduced by printing.
  • the image is saved in the printer as a matrix of dots arranged in rows and columns. The points of the matrix will be called in the following image points for the distinguish between registration points 6. Image points are white or black. Black dots must be printed.
  • the horizontal definition of the image is a function of the distance between two magnetic heads 2 elementary arranged on the same line.
  • the vertical definition is the pitch between two lines.
  • the pulses are emitted periodically.
  • the period of time that elapses between two pulses corresponds to the time taken by the drum to travel the distance equal to the pitch between two lines of the image.
  • the period of time is chosen so that the vertical definition retains the same value whatever the speed of rotation of the drum 3.
  • each picture point corresponds to a recording point.
  • the magnetized recording points 6 correspond to determined black image points, the non-magnetized recording points to white image points.
  • the recording points are at the intersection of a given line by the position of the drum 3 and a column given by the position of the elementary magnetic head 2. The column corresponds to the recording track 4.
  • the magnetographic printer comprises means for projecting ink particles onto the drum 3: ink particles 7 are projected by means of the projection means towards the magnetized recording points 6.
  • the inked surface at the level of magnetized recording point 6 on the drum 3 is designated by the reference 8 and is hereinafter called revealed 8 ( Figures 3, 6, 7, 9).
  • the magnetographic printer according to the present invention comprises means 9 for detecting a leading edge 10.
  • the leading edge 10 will be defined later in the description.
  • the detection means 9 consist of means 9A for storing lines of points and means 9B for comparing the stored lines.
  • the detection means 9 are for example in the form of a programmable component whose schematic diagram is indicated in FIG. 4.
  • the component comprises storage means 9A represented by memory cells called "line memory i", i between 1 and n + 2, where n represents the number of non-magnetized points or white image points preceding the leading edge as a minimum, as well as comparison means 9B represented by a logic gate.
  • i is between 1 and 4.
  • Three successive magnetized recording points 6A, 6B, 6C are considered on the same recording track 4 (FIGS. 2 and 3).
  • the three magnetized recording points 6 correspond to three image points belonging respectively to three successive lines I, I + 1, and I + 2.
  • Three successive current pulses are transmitted to the elementary magnetic head 2 opposite the recording track 4 in question.
  • the ink particle When the second magnetized recording point 6B passes the ink particle 7, the ink particle has already benefited from the work provided by the first magnetized recording point 6A.
  • the energy of the ink particle is provided by the work T of the magnetic development force.
  • the magnetized recording points not belonging to the leading edge are better revealed than those of the leading edge because they benefit from the work of the magnetic development force of the magnetized recording points that precede them.
  • the method according to the present invention consists in reinforcing the optical density of the revealed points 8 of the leading edge 10.
  • the distance leading edge n consists of all the magnetized recording points or black image points which are preceded on the same recording track by n non-magnetized recording points or white image points, contiguous in the direction of rotation of the drum, n being at least 1.
  • the number n depends on the printing technology.
  • a leading edge of distance n and of order m is defined, where m is at least equal to 1.
  • the distance corresponds to the number of non-magnetized recording points preceding in the direction of scrolling of the drum the magnetized point considered.
  • the order m corresponds to the distance in number of recording points separating the recording point considered from the first non-magnetized recording point preceding it in the direction of travel of the drum.
  • a leading edge of distance n and order 1 corresponds to the leading edge defined above.
  • a leading edge of distance n and of order m consists of all the magnetized recording points or black image points which are preceded on the same recording track by a magnetized recording point or dots. black image to be magnetized, contiguous in the direction of rotation of the drum, and belonging to the leading edge of distance n and order m-1.
  • the set of leading edges of distance n and of order m is denoted BAD n O m .
  • the leading edge BAD n O m is included in the leading edge BAD n-1 O m which is itself included in the leading edge BAD n-2 O m and so on to the edge d ADB attack 1 O m .
  • Two registration points or image points are contiguous if they are on two successive lines separated by a step.
  • Figure 5 shows the leading edge of the blackened image, while the other image points are grayed out.
  • the detection means 9 operate in the following manner: the storage means 9A store a number n + 1 of lines of image points.
  • the comparison means compare in real time the last of the n + 1 lines stored at the n rows of image points stored column by column to detect leading edge image points.
  • the control unit 5 is in connection with the detection means 9: the results of the comparison are transmitted to the control unit.
  • the comparison made and transmitted, the storage means 9A deletes the last n + 1 lines stored in time and stores the next line in the direction of rotation of the drum.
  • the comparison means compares the said next line with the other n rows stored and so on.
  • n + 2 number of lines of image points are stored: the storage means 9A store a new line while simultaneously the comparison means 9B work on the n + 1 lines stored as described above.
  • the programmable component operates as follows: a line of image points is stored in memory 9A.
  • the line of points is written in the memory line i modulo 4.
  • the line (i-1) modulo 4 is compared to the lines (i-2) modulo 4 and (i-3) modulo 4. If a point of black image of the line (i-1) modulo 4 is preceded by two white dots of the lines (i-2) modulo 4 and (i-3) modulo 4, the black image point in question of the line (i- 1) modulo 4 is part of the leading edge.
  • the detection means 9 indicates to the control unit that the black image point in question is a point of the leading edge. Then the next line of points is treated in the same way by incrementing the value of i by 1.
  • One of the embodiments of the method according to the invention consists in increasing the energy supplied to the recording points to be magnetized of the detected leading edge with respect to the energy supplied to the other recording points to be magnetized. not belonging to the leading edge.
  • the peak current of the pulse transmitted to the elementary magnetic head 2 is, to magnetize the detected leading edge recording points (line I), increased relative to that of the impulse transmitted to magnetize the other recording points (lines I + 1 and I + 2) not belonging to the leading edge.
  • the duration of the pulse transmitted to the elementary magnetic head 2 is, to magnetize the detected leading edge recording points (line I), increased by relative to that of the impulse transmitted to magnetize the other recording points (lines I + 1 and I + 2) not belonging to the leading edge.
  • FIG. 7 According to a third embodiment of the invention (FIG. 7), several pulses are transmitted to the elementary magnetic head 2 in order to magnetize the detected leading edge recording points (line I) while a single pulse is transmitted. to magnetize the other recording points (lines I + 1 and I + 2) not belonging to the leading edge.
  • the third embodiment is developed below: if one considers a magnetized recording point which is not preceded by magnetized recording points on its recording track 4 (FIGS. 8 and 9).
  • the third embodiment consists of creating at least two magnetized recording points 6 per black image dot to be printed.
  • the pulse I c generated between t 1 and t 2 corresponds to the first magnetized recording point of line I and column c;
  • the pulse I c + 1 generated between t 3 and t 4 corresponds to the first point magnetized recording of line I and column c + 1;
  • the pulse I c generated between t 8 and t 9 corresponds to the first magnetized recording point of the line I + 1 and column c;
  • the pulse I c generated between t 5 and t 6 corresponds to the second magnetized recording point of line I and column c. It corresponds to several magnetized recording points per black image point.
  • the method according to the third embodiment consists in transmitting to the elementary magnetic head 2 several current pulses I ref (FIG. 10) distributed on the same line of the image.
  • the control unit transmits three current pulses per line.
  • the energy injected into the magnetized recording point is identical if one or more pulses are emitted: the total duration of all the pulses is identical to the duration of the single pulse.
  • the optical density of the points revealed is 0.14.
  • the optical density of the points revealed is 0.19.
  • the optical density of the points revealed is 0.24.
  • the optical density of the points revealed increases by almost 50%.
  • the power dissipated in the elementary magnetic heads is likely to decrease.
  • the method according to the third embodiment consists in creating at least two magnetized points 6 per black image point belonging to the leading edge. By using the same energy to magnetize the recording points of the leading edge as to magnetize the others, the optical density of the leading edges is enhanced.
  • the power consumed in the elementary magnetic heads 2 is likely to be less than that consumed in the case of a method providing an energy identical to all the magnetized recording points. . Indeed, to obtain a proper revelation of the leading edges, the energy provided in the prior art should be increased for all points of the image. By increasing the energy of the magnetized points of the leading edge, it is possible to reduce the power consumed for the other magnetized points. Leading edges represent 5 to 30% of the magnetized recording points in traditional images.
  • a pulse of a duration of 280 nanoseconds for all the magnetized recording points is provided according to a conventional printing method.
  • three 160 nanosecond pulses are provided on the leading edges, and a single 160 nanosecond pulse for the other magnetized recording points is a higher supplied energy for the leading edge. and lower for the other magnetized recording points than the conventional printing method.
  • the energy consumed is therefore lower by using the method according to the invention.
  • the measured optical density is 0.21 with the conventional method and 0.27 with the method according to the invention.
  • the present invention therefore offers the advantage of improving printing while reducing the power consumed.
  • the record dots of the magnetized leading edges ADB 2 O 1 are detected and given a higher energy to the other magnetised points.
  • the energy supplied to the magnetized recording points decreases from one line to another from the leading edge.
  • the energy supplied to the magnetized recording points is a function of the leading edge BAD n 0 m to which they belong: at constant n, the energy decreases as m increases. It is recalled that at constant m, the energy is increasing when n increases.
  • the magnetographic printing method consists in creating magnetized recording points on the surface of the magnetic recording element 3 by means of at least one elementary magnetic head 2, to project ink particles. on each of the magnetized recording points so as to form images consisting of image points, the magnetized and inked registration points being called revealed points.
  • the method is characterized in that it consists in reinforcing the optical density of the revealed points belonging to the leading edge.
  • the method includes increasing the energy supplied to the magnetized recording points of the leading edge relative to the energy supplied to the other magnetized recording points.
  • the method includes detecting image points of the leading edge and increasing the energy supplied to the magnetized recording points of the leading edge.
  • the method consists in creating at least two magnetized recording points per image point belonging to the leading edge.
  • the energy of the magnetized recording points is decreasing in the direction of rotation of Element 3 from the leading edge according to the leading edge order.
  • the energy of the magnetized recording points of the leading edge increases as the distance from the leading edge increases.
  • the method increases the energy by modulating the electrical signals passing through the elementary magnetic head 2.
  • the present invention also relates to the printer capable of implementing the method as described above.
  • the magnetographic printer comprises at least one elementary magnetic head (2) capable of creating the magnetized recording points on the surface of the magnetic recording element (3), the control means (5) of the elementary magnetic head (2), means for projecting ink particles onto each of the magnetized recording points so as to form images consisting of image points.
  • the printer is characterized in that it comprises means for detecting the leading edge in connection with the control means (5) and means for increasing the energy supplied at least at the magnetized recording points of the edge of etching compared to the energy supplied to the other magnetized recording points.
  • the detection means comprise the means for storing at least two lines of image points and the means for comparing the rows column by column.

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  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
EP00400733A 1999-04-02 2000-03-16 Procédé d'impression mangnétographique Expired - Lifetime EP1040926B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9904129A FR2791785B1 (fr) 1999-04-02 1999-04-02 Procede d'impression magnetographique
FR9904129 1999-04-02

Publications (2)

Publication Number Publication Date
EP1040926A1 EP1040926A1 (fr) 2000-10-04
EP1040926B1 true EP1040926B1 (fr) 2007-05-30

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EP00400733A Expired - Lifetime EP1040926B1 (fr) 1999-04-02 2000-03-16 Procédé d'impression mangnétographique

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US (1) US6345882B1 (ja)
EP (1) EP1040926B1 (ja)
JP (1) JP2000326547A (ja)
DE (1) DE60034982T2 (ja)
FR (1) FR2791785B1 (ja)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005019920A1 (de) * 2005-04-27 2006-11-16 Leonhard Kurz Gmbh & Co. Kg Verfahren zur Erzeugung einer partiell ausgeformten elektrisch leitfähigen Struktur
US9251458B2 (en) 2011-09-11 2016-02-02 Féinics Amatech Teoranta Selective deposition of magnetic particles and using magnetic material as a carrier medium to deposit nanoparticles
EP2784724A3 (en) 2013-03-27 2015-04-22 Féinics AmaTech Teoranta Selective deposition of magnetic particles, and using magnetic material as a carrier medium to deposit other particles
KR102265729B1 (ko) 2019-03-08 2021-06-16 (주)아이엠씨티 자구 드로잉 장치
NL2023988B1 (en) * 2019-10-10 2021-04-15 Xeikon Prepress Nv Punching Station and Method for a Relief plate precursor

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4414554A (en) * 1980-07-21 1983-11-08 Ferix Corporation Magnetic imaging apparatus
FR2664201B1 (fr) * 1990-07-03 1992-09-11 Bull Sa Appareil permettant a un organe de rester, sans contact physique, a une distance predeterminee d'une surface entrainee en deplacement.
JP3209619B2 (ja) * 1993-08-24 2001-09-17 シャープ株式会社 磁気プリンタ用記録ヘッド
US5712675A (en) * 1995-05-15 1998-01-27 Chung-duck Kim Method and apparatus for enhancing laser printer resolution

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
DE60034982D1 (de) 2007-07-12
FR2791785A1 (fr) 2000-10-06
EP1040926A1 (fr) 2000-10-04
US6345882B1 (en) 2002-02-12
FR2791785B1 (fr) 2001-07-13
JP2000326547A (ja) 2000-11-28
DE60034982T2 (de) 2008-01-31

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