EP1783564B1 - Appareil d'impression utilisant la magnetisation pour ecrire l'image - Google Patents

Appareil d'impression utilisant la magnetisation pour ecrire l'image Download PDF

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Publication number
EP1783564B1
EP1783564B1 EP20050292185 EP05292185A EP1783564B1 EP 1783564 B1 EP1783564 B1 EP 1783564B1 EP 20050292185 EP20050292185 EP 20050292185 EP 05292185 A EP05292185 A EP 05292185A EP 1783564 B1 EP1783564 B1 EP 1783564B1
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EP
European Patent Office
Prior art keywords
magnetization
magnetizable layer
printing apparatus
unit
writing
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EP20050292185
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German (de)
English (en)
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EP1783564A2 (fr
EP1783564A3 (fr
Inventor
Klaus Hense
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Sagemcom Documents SAS
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Sagemcom Documents SAS
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Priority to EP20050292185 priority Critical patent/EP1783564B1/fr
Priority to DE2005292185 priority patent/DE05292185T1/de
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Publication of EP1783564A3 publication Critical patent/EP1783564A3/fr
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G19/00—Processes using magnetic patterns; Apparatus therefor, i.e. magnetography

Definitions

  • the invention relates to a printing apparatus, as claimed in independent apparatus claim 1 and to a method as claimed in claim 15. Further details and embodiments are disclosed in the dependent claims.
  • Printing apparatuses are known in which a magnetization apparatus magnetizes, or writes a magnetizable area of a print drum, and thereafter magnetic toner is applied to said magnetized areas. Thereafter, the toner is then delivered to a part to be printed, such as a sheet of a paper. Prior to the renewed magnetizing, the magnetizable print drum is magnetized with a further magnetization device in the best homogeneous manner, with the previously magnetized areas being overwritten, which is why this process is also known as erasure. It is provided for in these known printing apparatuses that the north-south polarization plane of the magnetization apparatuses for writing and the magnetization apparatus for erasing are identical.
  • the north-south polarization plane is arranged substantially parallel to the surface of the print drum.
  • the so-called Weiss domains of the magnetizable drum are arranged parallel to its surface.
  • the written and erased areas differ substantially by the frequency with which they follow each other. It can be provided that the erased areas have a substantially higher frequency of the sequence of successive north-south transitions, as a result of which this area does not have any resulting magnetic field for coarse-grained toner.
  • the disadvantage in this known printing apparatus is that the same have a limited resolution as a result of the parallel alignment of the north-south transitions. Although an increase in the resolution is possible within a certain range by a reduction of the thickness of the magnetizable layer, this will lead to a decrease in the magnetic effect and thus the ability to bind the toner.
  • the JP 09 197898 A discloses a printing device with a writing device and an erasing device, whereby the writing device is arranged substantially right-angled vis-à-vis the erasing device.
  • first magnetization device and the second magnetization device are arranged in such a way that a first magnetization direction and/or a second magnetization direction can be produced at the first position, and that the second magnetization direction at the first position of the magnetizable layer at the first position of the magnetizable layer.
  • the achievable resolution can thus be increased considerably in a magnetizable printing apparatus without reducing the thickness of the magnetic layer.
  • This allows using more fine-grained toner than in printing apparatuses with magnetization apparatuses arranged in one plane.
  • the more fine-grained toner offers a higher sharpness, especially a higher contour sharpness and a further improved resolution.
  • By charging the plane of the magnetization device during the writing process it is possible to use a substantially simpler structured writing unit because the unwritten areas remain unused during a writing or magnetization process.
  • the magnetizable layer is arranged in the region of a first surface of a preferably rotationally symmetrical basic body, preferably that the first surface is formed by the at least one magnetizable layer.
  • the first magnetization direction is arranged substantially normal to the first surface.
  • a strong, but finely resolved stray field can thus be achieved, as a result of which toner can easily be absorbed at such places.
  • a writing unit comprising at least one heat source acting upon the magnetizable layer for heating a writing area on the magnetizable layer to a temperature in the region of the curie temperature of the magnetizable layer.
  • a predeterminable area for magnetization can thus be triggered in a purposeful manner.
  • the writing unit comprises at least a first cooling unit for cooling the writing area, which unit is provided downstream of the first heat source, and that the first magnetization device is associated with the first cooling unit and, especially after a heating of the writing area, acts upon the writing area to be cooled.
  • a predeterminable magnetization can thus be applied upon the area heated by the first heat source.
  • an erasure unit comprising at least one second heat source acting upon the magnetizable layer for heating an erasure area on the magnetizable layer to a temperature in the region of the curie temperature of the magnetizable layer. A predeterminable area for magnetizing or erasing can thus be triggered.
  • the erasure unit comprises at least one second cooling unit for cooling the erasure unit downstream of the second heat source, and that the second magnetization device is associated with the second cooling unit, and, especially after a heating of the erasure area, acts upon the erasure area to be cooled.
  • a predeterminable magnetization can thus be applied upon the area heated by the second heat source.
  • the erasure unit is provided upstream of the writing unit. This ensures that the magnetizable layer has a defined magnetic state during the writing process, as a result of which it is possible to omit the magnetization of the areas not be printed, which allows providing the printing head with a substantially simpler configuration.
  • the first and/or second heat source comprise(s) at least one laser and/or at least one thermal resistance element. This allows a precisely defined heating of individual areas of the magnetizable layer and thus also a high resolution.
  • the writing unit comprises in outgoing circuit at least one toner delivery element for delivering magnetic toner to the magnetizable layer. This allows the application of toner onto the magnetizable layer.
  • toner transfer means for transferring magnetic toner to a medium to be printed are provided downstream of the toner delivery element, as a result of which a medium can be printed with toner.
  • the toner transfer means comprise at least one magnetic unit. This ensures a complete transfer of the toner to the medium to be printed. The printing density is thus increased, the consumption of toner is reduced and an additional cleaning of the magnetizable layer prior to the next writing process can be omitted.
  • the invention further relates to a printer with a printing apparatus in accordance with the invention, as a result of which all advantages of a printing apparatus in accordance with the invention can be used in a printer.
  • the invention further relates to a method for magnetizing a magnetizable layer, especially a magnetizable layer for a printing apparatus, preferably for a printing apparatus in accordance with the invention.
  • the achievable resolution can thus clearly be increased in a magnetic printing apparatus without reducing the thickness of the magnetic layer. It is thus possible to use a more fine-grained toner than in printing apparatuses with magnetizing devices arranged in one plane. As a result of the more fine-grained toner, it is possible to achieve a higher sharpness, especially a higher contour sharpness and a further improved resolution. As a result of the change of the plane of the magnetizing direction during the writing process it is possible to use a writing unit of simpler configuration because the areas not be written remain unaffected during a writing or magnetizing process.
  • the magnetizable layer is heated locally prior to magnetization to a temperature in the range of its curie temperature and is cooled during magnetization in a homogeneous magnetic field.
  • a predeterminable area for magnetization can thus be triggered in a purposeful manner and a predeterminable magnetic field can be applied to said area.
  • Figs. 1, 2 and 3 show especially preferred embodiments of a printing apparatus, comprising a layer 3 magnetizable at least in certain sections, a first magnetization device 1 with a first north-south polarization direction 4 for introducing a first magnetization direction 25 into the magnetizable layer 3, and a second magnetization device 2 with a second north-south polarization plane 17 for introducing a second magnetization direction 26 into the magnetizable layer 3, with the first magnetization device 1 and the second magnetization device 2 being provided for the predeterminable magnetization of a first point 22 of the magnetizable layer 3.
  • a displacement of the first point 22 to the effective region of the second magnetization device 2 is provided, with the first magnetization device 1 and the second magnetization device 2 being arranged in such a way that a first magnetization direction 25 and/or a second magnetization direction 26 can be produced at the first position 22, and that the second magnetization direction 26 is substantially right-angled to the first magnetization direction 25.
  • the achievable resolution can thus be clearly increased in a magnetic printing apparatus without reducing the thickness of the magnetic layer 3. It is thus possible to use more fine-grained toner than in printing apparatuses with magnetization directions 25, 26 arranged in one plane.
  • the more fine-grained toner allows achieving a higher sharpness, especially a higher contour sharpness and a further improved resolution.
  • By changing the plane of the magnetization direction 25, 26 during the writing process it is possible to use a writing unit 7 with a substantially simpler configuration because areas not to be written remain unaffected during a writing or magnetizing process.
  • a printing apparatus comprising at least one layer 3 which is magnetizable at least in sections, a first magnetization device 1 with a first north-south polarization direction 4 for introducing a first magnetization direction 25 into the magnetizable layer 3, and a second magnetization device 2 with a second north-south polarization plane 17 for introducing a second magnetization direction 26 into the magnetizable layer 3, with the first magnetization device 1 and the second magnetization device 2 being provided for the predeterminable magnetization of at least one point 23 on a surface of the first point 22 of the magnetizable layer 3, with the first magnetization direction 25 enclosing at the first point 22 a first angle ⁇ relative to a first predeterminable tangent 24 through a first point 23, and that the second magnetization direction 26 which is caused by the second magnetization device 2 in the first point 23, optionally after a displacement of the first point 23 and the tangent 24 to an effective region of the second magnetization device 2, encloses in
  • Point 22 can be understood as being a region of the magnetizable layer 3 which comprises a spatial expansion which allows the occurrence of a first and/or a second magnetization direction 4, 17.
  • a point 22 therefore preferably comprises the spatial expansion of two Weiss domains which are arranged relative to each other in close spatial proximity. This allows that both a first as well as a second magnetization direction 4, 17 occurs at the point 22.
  • the first point 23 can concern a single molecular magnet, therefore the smallest spatial expansion in the magnetic sense.
  • the first angle ⁇ as well as the second angle ⁇ are determined in the mathematically positive sense, i.e. counter-clockwise, starting from the tangent 24 to the magnetizable layer in the first point 23.
  • the predeterminable tangent 24 can concern a straight line which can be predetermined freely in the space and which touches the magnetizable layer 3 in the first point 23. It is provided especially that the tangent 24 has an ascent in the first point 23 of the magnetizable layer. Especially in the case of a three-dimensionally changing magnetizable layer 3, this need not concern the largest ascent occurring locally at the first point 23. In the case of especially preferred embodiments of the present invention it can be provided that the tangent 24 has the highest possible ascent in the first point 23.
  • the first magnetization device 1 and the second magnetization device 2 are arranged at spatially different places which can be reached or triggered with the magnetizable layer 3.
  • the invention relates to the arrangement of the magnetization direction 25 relative to the second magnetization direction 26 in the magnetizable layer 3. This can be independent of the spatial arrangement of the first magnetization device 1 relative to the second magnetization device 2. It may rather be provided that the first magnetization device 1 can assume any predeterminable position relative to the second magnetization device 2, such that by suitable displacement of the magnetizable layer 3 between the first magnetization device 1 and the second magnetization device 2 it can be achieved that the first magnetization direction 25 is or can be arranged substantially normal to the second magnetization direction 26.
  • Displacement can be understood as being a transport or a movement of the magnetizable layer 3, which is therefore a movement which brings the first point 22 from the first magnetization device 1 to the second magnetization device 2 or vice-versa.
  • a movement of both the magnetizable layer 3 and/or the first and/or second magnetization device 1, 2 can be provided.
  • the printing apparatus in accordance with the invention can concern a printing apparatus for use in any kind of printer, such as printers for connection to computers, fax machines, calculating machines and/or cash registers, printers for measuring devices, printing machines for books and/or newspapers or the like.
  • printers for connection to computers, fax machines, calculating machines and/or cash registers printers for measuring devices, printing machines for books and/or newspapers or the like.
  • the use can be provided with merely one colour such as black-and-white printers or with several colours.
  • a printing apparatus in accordance with the invention must be provided in analogous multiple configuration of at least individual modules depending on the scope of colour.
  • a negative image of a copy to be printed is produced on a magnetizable layer 3, with the copy being formed by regions with different magnetic states, so-called written areas 19 and erased areas 20.
  • written areas 19 At certain areas with a specific magnetic state it is possible that magnetic toner will adhere to the magnetizable layer 3 (written area 19), which can be passed on to a medium 15 to be printed, such as cellulose material like paper or cardboard, and/or textile fabric.
  • the magnetizable layer 3 is arranged on a basic body 6. It is preferably provided that the magnetizable layer 3 is arranged in the region of a first surface 5 of the basic body 6, and/or that preferably the first surface 5 is formed by the magnetizable layer 3, of which there is at least one.
  • the basic body 6 is preferably made of a material which is not magnetizable or only with difficulty such as plastic or a metal such as aluminium or non-magnetic special steel.
  • the basic body 6 can have any shape. It can be provided especially that the basic body 6 has a shape diametrically opposed to the medium 15 to be printed, such as the shape of a plane plate. It can be provided for preferably that the basic body 6 is rotationally symmetrical.
  • the shape can be provided diametrically opposed to a medium to be printed, e.g. in form of a barrel, a cylinder or roller and/or a cone or truncated cone.
  • the rotationally symmetrical configuration of the basic body 6 allows realizing an especially simple process sequence with a printing apparatus in accordance with the invention, with an image being applied to a position of a rotating basic body 6.
  • the toner can be applied to the respectively described areas 19 of the basic body 6.
  • the toner can be supplied to the medium 15 to be printed.
  • Prior to the application or writing of a further image it is possible to erase the preceding image, e.g. by producing a defined magnetization state which is as even as possible over the entire width and/or surface of the basic body 6.
  • an image of a picture to be printed is applied onto the magnetizable layer 3.
  • a homogeneous magnetization is preferably applied to the magnetizable layer 3. Since all images which may previously have been applied onto the magnetic layer 3 are erased, this process can also be designated as erasure.
  • the respective areas of homogeneous magnetization are designated as erased areas 20.
  • An image of a picture to be printed is formed in a printing apparatus in accordance with the invention by the written areas 19.
  • the written areas 19 have magnetic states which differ from the magnetic states of the erased areas 20. Only areas are written on which are provided for in the printing process for blackening or colouring. The areas not to be printed which are not provided for blackening or colouring maintain their magnetic state. It can be provided for in particular that the written areas 19 which are part of an image comprise a first magnetization direction 25 which is arranged substantially normal to the first surface.
  • the erased areas 20 which are not part of the image or which are indirectly part of the image as erased areas 20 not to be printed but shall remain white in the finished picture comprise a second magnetization direction 26 which is arranged substantially normal to the first magnetization direction 25. It is provided for in particular that the second magnetization direction 26 is arranged substantially parallel to the first surface 5. It is preferably provided that prior to the application of the image onto the magnetizable layer 3, the magnetizable layer 3 is applied with a substantially homogeneous magnetic second magnetization direction 26 substantially parallel to the first surface 5. A continuous magnetic field is thus formed which hardly contains any stray fields and thus does not attract any magnetic toner.
  • a writing unit 7 for applying the image onto the magnetizable layer 3 and/or an erasing unit 10 for producing the best possible homogeneous magnetic polarization or magnetization direction 25, 26 are provided, with the erasing unit 10 preferably being upstream of the writing unit 7.
  • the writing unit of which there is at least one, preferably comprises at least a first heat source 8 acting upon the basic body 6 for heating a writing area 9 on the first surface 5, to a temperature in the range of the curie temperature of the magnetizable layer 3.
  • a first heat source 8 acting upon the basic body 6 for heating a writing area 9 on the first surface 5, to a temperature in the range of the curie temperature of the magnetizable layer 3.
  • the writing unit 7 comprises at least a first cooling unit for cooling the writing area 9, which cooling unit is downstream of the first heat source 1, and that the first magnetization device 1 is associated with the first cooling unit and acts upon the writing area 9 to be cooled off. It has been noticed that for applying a predeterminable first or second magnetization direction 25, 26 with a predeterminable magnetic north-south polarization plane 4, 17 it is not necessary to heat the magnetizable layer 3 over its curie temperature. It can be sufficient on the other hand when the achieved temperature is approx. 85 to 90% of the curie temperature.
  • a writing area 9 is preferably an area which is intended for printing and which is therefore written with the data belonging to a picture or an image, or which should be capable of being written with such data.
  • the writing area 9 can have a different spatial expansion depending on the type and the application.
  • the first magnetization device 1 can be formed by each arrangement emitting a magnetic field. It can be provided that the first magnetization device 1 comprises at least one permanent magnet and/or an arrangement of such a one. It can also be provided that the first magnetization device 1 comprises at least one electromagnet and/or an arrangement of such a one. A combination of permanent magnet and electromagnet can be provided. It is preferably provided that the magnetic effect is limited to the narrowest possible area, with the first magnetization device 1 being configured accordingly.
  • One advantage of the invention is that a focussing of the magnetic effect to individual pixels can be omitted.
  • One feature of the first magnetization device 1 is the first north-south polarization plane 4, which therefore leads to the alignment of the magnetic field generated by the first magnetization device 1.
  • the first heat source 8 is preferably configured in such a way that it allows a predeterminable heating of individual areas on the magnetizable layer 3. Since the first magnetization direction 25 is changed in the direction of the magnetic first north-south polarization plane 4 during the subsequent cooling in the magnetic field of the first magnetization device 1 in each area heated by the first heat source 8, every heated area will receive toner and cause a blackening on the medium 15 to be printed. The fineness with which individual areas can be heated on the magnetizable layer 2 is therefore directly proportional to the achievable printing resolution. As a result of the alignment of the first magnetization direction 25 normal to the first surface 5, the resolution is additionally increased relative to a printer with identical magnetization directions in the described areas 19 and the erased areas 20.
  • the first heat source 8 comprises at least one laser and/or at least one thermal resistance element.
  • means are provided which allow a predeterminable heating of every possible pixel to be written.
  • a predeterminable number of lasers with respective focussing apparatuses or at least one thermal resistance element per pixel to be printed can be provided for heating a pixel individually provided for printing.
  • the basic body 6 upon operation of the printing apparatus, the basic body 6 performs a relative movement to the writing unit 7 or is provided for such a relative movement, such that the writing unit 7 is moved past the basic body 6 or the first surface 5, or vice-versa.
  • This is provided especially in the case of specially preferred embodiments with a rotationally-symmetrical basic body 6. It can also be simply be implemented by rotating the basic body 6.
  • the basic body 6 carries out a relative movement towards the writing unit 7, especially when the writing unit 7 is guided over the first surface 5 such as in the longitudinal direction of a printing area, that lasers or thermal resistance elements are arranged merely for heating at least one row of pixels along the maximally provided printing width.
  • the entire provided printing width can be printed with the maximum possible resolution in a preferred embodiment. It can also be provided (e.g. in the case of special applications where no constant resolution is required over the printing width) that the type, configuration and density of the employed thermal resistance elements is not constant over the width of the printing area or is provided with a different configuration in sections.
  • the erasure unit 10 of which there is at least one, can be preferably configured substantially equivalent to the at least one writing unit.
  • the erasure unit 10 therefore preferably comprises at least one second heat source 11 acting upon the basic body 6 for heating an erasure area 12 on the first surface 5, to a temperature in the range of the curie temperature of the magnetizable layer 3, and a second cooling unit for cooling the erasure area 12, which cooling unit is provided downstream of the heat source 11, with the second magnetization device 2 being associated with the second cooling unit and acting upon the erasure area 12 to be cooled.
  • Erasure shall be understood as producing the best possible homogeneous second magnetization direction 26 or a homogeneous north-south polarization of the magnetizable layer 3, substantially over the entire printing area.
  • Erasure area 12 shall be understood as the area which is respectively erased. This can concern the entire surface to be printed, or it can also preferably be provided (especially in embodiments in which the erasure unit 10 is or should be moved relative to the basic body 6 like a writing unit 7) that the erasure area 12 merely assumes a partial area of the surface to be printed, especially a partial area extending over the width of a basic body 6 movable in the longitudinal direction relative to the erasure unit 10.
  • the second heat source 11 can have any type and configuration as described above in connection with the explanation of the first heat source 8.
  • the second heat source 11 can be provided with a configuration which is less focussing, because a precise heating of individual defined pixels need not be necessary during erasure.
  • the second magnetization device 2 can be configured with respect to its type and configuration in an equivalent manner to the first magnetization device 1. It can be provided with a configuration which is less focussing.
  • Fig. 1 shows a highly schematic view of an especially preferred embodiment of a printing apparatus in accordance with the invention, with the basic body 6 being rotationally symmetrical.
  • the printing apparatus is shown in a projecting manner towards the longitudinal extension of the basic body 6.
  • the individually shown modules are merely shown schematically in an exemplary manner.
  • the dimensions, proportions and the precise position at which the individual components are arranged are merely exemplary and can depart from the illustrated dimensions, proportions and the precise position.
  • the basic body 6 moves clockwise in operation, i.e. it moves according to the illustrated arrow 18.
  • the writing unit 7, of which there is at least one, is arranged.
  • the writing unit 7 comprises the first heat source 8 which acts upon the writing area 9 shown with the dotted line.
  • the writing unit 7 further comprises the first cooling unit. It can simply concern an area which is not heated. It is also possible that a ducted cooling is provided for the writing area 9 which is heated above by the first heat source 8.
  • a first magnetization device 1 is arranged which acts upon the magnetizable layer 3 with a magnetic field with the first north-south polarization plane 4.
  • Fig. 1 clearly shows how the first magnetization device 1, which is shown symbolically by a bar magnet, is arranged with a first north-south polarization plane 4 normal to the first surface.
  • the writing unit 7 is provided downstream with at least one toner delivery element 13, for supplying magnetic toner to the magnetizable layer 3.
  • the toner delivery element 13 comprises means for the purposeful delivery of magnetic toner to the written areas. It should thus prevent that toner is delivered to erased areas 20, which should hardly be given anyway as a result of the substantially lower stray field in the erased areas 20.
  • the toner delivery element 13 is provided downstream with toner transfer means 14 for transferring magnetic toner to a medium 15 to be printed.
  • toner transfer means 14 can be formed in a simple embodiment by a roller or the like, which press the medium 15 to be printed (which in a simple embodiment can be a sheet of paper) against the basic body 6 and thus against the toner-adhering magnetizable layer 3.
  • the toner transfer means 14 comprise at least one magnetic unit 16.
  • the magnetic unit 16 supports the transfer of the toner from the magnetizable layer 3 to the medium 15 to be printed.
  • the erasure unit 10 of which there is at least one, is arranged before the writing unit 7 as seen in the process direction.
  • the erasure unit 10 is arranged at the lowermost position in Fig. 1 .
  • the erasure unit 10 is symbolized by a cuboid shown with the broken line.
  • the erasure unit 10 comprises the second heat source 11 which acts upon the erasure area 12 illustrated with the dotted line.
  • Fig. 2 shows a strongly enlarged schematic representation of a preferred embodiment of a basic body 6 with a magnetizable layer 3 which forms a first surface 5.
  • the thin magnetizable layer 3 can clearly be seen, which layer is between 100 nm and 200 ⁇ m, especially between 1 ⁇ m and 20 ⁇ m, and preferably between 5 ⁇ m and 15 ⁇ m.
  • the respective prevailing first or second magnetization direction 25, 26 is illustrated by small arrows.
  • the erased area 20 with its uniform second magnetization direction 26 parallel to the first surface 5 can clearly be seen.
  • the demagnetization area 21 which at the respective point in time is heated over the curie temperature, as well as the adjacent written areas 19 with the first magnetization direction 25 which is arranged normal to the first surface 5.
  • Fig. 3 shows a further strongly schematic illustration of the magnetizable layer 3 of a printing apparatus in accordance with the invention, comprising a first magnetization device 1 and a second magnetization device 2 which are arranged parallel with respect to each other.
  • the first magnetization device 1 and the second magnetization device 2 are arranged in such a way that the first magnetization direction 25 which is caused by the first magnetization device 1 in the magnetizable layer 3 is arranged normal relative to the second magnetization direction 26 which is caused by the second magnetization direction 2.
  • the magnetizable layer 3 is magnetized in a second magnetization direction 26 by the second magnetization device 2 at a first point 22 which is illustrated by an area marked with a broken line.
  • the magnetizable layer 3 continues to move according to the direction of the arrow 18, as a result of which the first point 22 is moved or displaced to the effective environment of the first magnetization device 1.
  • the first magnetization device 1 magnetizes the magnetizable layer 3 at the first point in a magnetization direction 25.
  • an arrow indicating the first magnetization direction 25 and an arrow indicating the second magnetization direction 26 are shown extended to such an extent that they intersect. It can clearly be seen that they enclose an angle substantially of approx. 90°.
  • the respective arrow illustrating the first magnetization direction 25 is further extended to such an extent that the first angle a can be recognized which encloses the first magnetization direction 25 relative to tangent 24 in the first point 23. Since the second north-south polarization plane 17 of the second magnetization device 2 is arranged parallel to the tangent 24 in the first point 23 closest to the second magnetization device 2, and therefore the second magnetization direction 26 is arranged parallel to tangent 24, the second angle b which the second magnetization direction 26 encloses to tangent 24 is zero in this illustrated embodiment. The amount of the difference of the first angle ⁇ and the second angle ⁇ is therefore substantially 90° or ⁇ /2. It is also possible to provide other arrangements of the first magnetization device 1 and the second magnetization device 2.
  • the magnetizable layer 3 is magnetized in a second magnetization direction 26, and is magnetized thereafter in sections in a first magnetization direction 25 which is substantially normal to the second magnetization direction 26. It can be provided in particular that the magnetizable layer 3 is heated prior to magnetization locally in the range of its curie temperature and is cooled during magnetization in a homogeneous magnetic field.

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Claims (16)

  1. Un appareil d'impression comprenant un corps (6), comprenant une couche (3) qui peut être magnétisé au moins dans des sections, une unité d'écriture (7) comprenant un premier dispositif de magnétisation (1) avec un premier plan de polarisation nord - sud (4) pour introduire un premier sens de magnétisation (25) dans la couche magnétisable (3) et une unité d'effacement (10) comprenant un deuxième dispositif de magnétisation (2), avec un deuxième plan de polarisation nord - sud (17) pour introduire un deuxième sens de magnétisation (26) dans la couche magnétisable (3), avec le premier dispositif de magnétisation (1) et le deuxième dispositif de magnétisation (2) étant fournis pour la magnétisation prédéterminable d'une première position (22) de la couche magnétisable (3), qui est configurée pour se déplacer de la deuxième à la première région du dispositif de magnétisation caractérisé en ce que le premier dispositif de magnétisation (1) et le deuxième dispositif de magnétisation (2) sont disposés de sorte que le deuxième sens de magnétisation (26) produit à la première position (22), soit à angle droit avec le premier sens de magnétisation (25) produit à la première position.
  2. Un appareil d'impression selon la revendication 1, caractérisé en ce qu'un déplacement de la première position (22) dans une région efficace du deuxième dispositif de magnétisation (2) est fourni.
  3. Un appareil d'impression selon la revendication 1 ou 2, caractérisé en ce qu'une couche magnétisable (3) est disposée dans la région d'une première surface (5) d'un corps de base de préférence symétrique et rotatif (6) de préférence que la première surface (5) est formée par la couche magnétisable (3), au nombre d'au moins une.
  4. Un appareil d'impression selon la revendication 1, 2 ou 3, caractérisé en ce que le premier sens de magnétisation (25) est disposé principalement de façon normale par rapport à la première surface (5).
  5. Un appareil d'impression selon l'une des revendications 1 à 4, caractérisé en ce que l'unité d'écriture (7) comprend au moins une source de chaleur (8) agissant sur la couche magnétisable (3) pour chauffer une zone d'écriture (9) sur la couche magnétisable (3) à une température dans la région de la température de Curie de la couche magnétisable (3).
  6. Un appareil d'impression selon la revendication 5, caractérisé en ce que l'unité d'écriture (7) comprend au moins une unité de refroidissement pour refroidir la zone d'écriture (9), unité qui est munie en aval de la première source de chaleur (1), et en ce que le premier dispositif de magnétisation (1) est associé à la première unité de refroidissement et, en particulier après un chauffage de la zone d'écriture (9) qu'il agit sur la zone d'écriture (9) à refroidir.
  7. Un appareil d'impression selon l'une des revendications 1 à 6, caractérisé en ce que l'unité d'effacement (10) comprend au moins une deuxième source de chaleur (11) agissant sur la couche magnétisable (3) pour chauffer une zone d'effacement (12) sur la couche magnétisable (3) à une température dans la régions de la température de Curie de la couche magnétisable (3).
  8. Un appareil d'impression selon la revendication 7, caractérisé en ce que l'unité d'effacement (10) comprend au moins une deuxième unité de refroidissement pour refroidir la zone d'effacement (12) en aval de la deuxième source de chaleur (11), et que le deuxième dispositif de magnétisation (2) est associé à la deuxième unité de refroidissement, et, en particulier, après un chauffage de la zone d'effacement (12), il agit sur la zone d'effacement (12) à refroidir.
  9. Un appareil d'impression selon la revendication 7 ou 8, caractérisé en ce que l'unité d'effacement (10) est munie en amont de l'unité d'écriture (7).
  10. Un appareil d'impression selon la revendication 7, 8 ou 9, caractérisé en ce que la première et/ou la deuxième source de chaleur (8, 11) comprend/comprennent au moins un laser et/ou au moins un élément à résistance thermique.
  11. Un appareil d'impression selon l'une des revendications 5 à 10, caractérisé en ce que l'unité d'écriture (7) comprend dans un circuit sortant au moins un élément de distribution de toner (13) pour distribuer un toner magnétique à la couche magnétisable (3).
  12. Un appareil d'impression selon la revendication 11, caractérisé en ce que des moyens de transfert de toner (14) pour transférer un toner magnétique à un support (15) à imprimer sont fournis en aval de l'élément de distribution de toner (13).
  13. Un appareil d'impression selon la revendication 12, caractérisé en ce que des moyens de transfert de toner (14) comprennent au moins une unité magnétique (16).
  14. Une imprimante avec un appareil d'impression selon l'une des revendications 1 à 13.
  15. Une méthode pour magnétiser une couche magnétisable (3), pour un appareil d'impression selon l'une des revendications 1 ou 13, et/ou une imprimante selon la revendication 14, caractérisée en ce qu'une première position (22) de la couche magnétisable (3) est magnétisée dans un deuxième dispositif de magnétisation (26), puis la même première position (22) de la couche magnétisable (3) est magnétisée dans des sections dans un premier sens de magnétisation (25) qui est principalement normal par rapport au deuxième sens de magnétisation (26).
  16. Une méthode selon la revendication 15, caractérisée en ce que la couche magnétisable (3) est chauffée localement avant la magnétisation à une température dans la fourchette de sa température de Curie et est refroidie pendant la magnétisation dans un champ magnétique homogène.
EP20050292185 2005-10-17 2005-10-17 Appareil d'impression utilisant la magnetisation pour ecrire l'image Expired - Fee Related EP1783564B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP20050292185 EP1783564B1 (fr) 2005-10-17 2005-10-17 Appareil d'impression utilisant la magnetisation pour ecrire l'image
DE2005292185 DE05292185T1 (de) 2005-10-17 2005-10-17 Druckvorrichtung mit Magnetisierungsverfahren und Vorrichtung zur Bilderzeugung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20050292185 EP1783564B1 (fr) 2005-10-17 2005-10-17 Appareil d'impression utilisant la magnetisation pour ecrire l'image

Publications (3)

Publication Number Publication Date
EP1783564A2 EP1783564A2 (fr) 2007-05-09
EP1783564A3 EP1783564A3 (fr) 2007-06-20
EP1783564B1 true EP1783564B1 (fr) 2014-12-03

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Application Number Title Priority Date Filing Date
EP20050292185 Expired - Fee Related EP1783564B1 (fr) 2005-10-17 2005-10-17 Appareil d'impression utilisant la magnetisation pour ecrire l'image

Country Status (2)

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EP (1) EP1783564B1 (fr)
DE (1) DE05292185T1 (fr)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4202022A (en) * 1975-10-20 1980-05-06 Kokusai Denshin Denwa Kabushiki Kaisha Magnetic transfer record film and apparatus for magneto-optically reading magnetic record patterns using the same
DE3153285C2 (fr) * 1980-09-24 1992-02-27 Ricoh Co., Ltd., Tokio/Tokyo, Jp
FR2518771A1 (fr) * 1981-12-23 1983-06-24 Cii Honeywell Bull Procede et machine d'impression magnetographique
JPH0246940B2 (ja) * 1983-03-29 1990-10-17 Fuji Xerox Co Ltd Jikikirokutai
JP3253842B2 (ja) * 1996-01-17 2002-02-04 シャープ株式会社 磁気記録媒体及びその製造方法並びにそれを用いた磁気印写装置
JP2000284516A (ja) * 1999-03-30 2000-10-13 Dainippon Ink & Chem Inc 強誘電体を用いた画像の形成方法

Also Published As

Publication number Publication date
EP1783564A2 (fr) 2007-05-09
EP1783564A3 (fr) 2007-06-20
DE05292185T1 (de) 2007-10-18

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