EP0803783B1 - Bildaufzeichnungsträger und Verfahren zu seiner Herstellung - Google Patents

Bildaufzeichnungsträger und Verfahren zu seiner Herstellung Download PDF

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Publication number
EP0803783B1
EP0803783B1 EP19970201203 EP97201203A EP0803783B1 EP 0803783 B1 EP0803783 B1 EP 0803783B1 EP 19970201203 EP19970201203 EP 19970201203 EP 97201203 A EP97201203 A EP 97201203A EP 0803783 B1 EP0803783 B1 EP 0803783B1
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EP
European Patent Office
Prior art keywords
holes
electrodes
drum body
image
forming element
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
EP19970201203
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English (en)
French (fr)
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EP0803783A1 (de
Inventor
Marcel Slot
Lamberdina Johanna Anna M. Driessen-Olde Scheper
Norbertus Gerardus Christiaan Maria Van Reuth
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Canon Production Printing Netherlands BV
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Oce Technologies BV
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Priority to EP19970201203 priority Critical patent/EP0803783B1/de
Publication of EP0803783A1 publication Critical patent/EP0803783A1/de
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Publication of EP0803783B1 publication Critical patent/EP0803783B1/de
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/22—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20
    • G03G15/34—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 in which the powder image is formed directly on the recording material, e.g. by using a liquid toner
    • G03G15/344—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 in which the powder image is formed directly on the recording material, e.g. by using a liquid toner by selectively transferring the powder to the recording medium, e.g. by using a LED array
    • G03G15/348—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 in which the powder image is formed directly on the recording material, e.g. by using a liquid toner by selectively transferring the powder to the recording medium, e.g. by using a LED array using a stylus or a multi-styli array
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2217/00—Details of electrographic processes using patterns other than charge patterns
    • G03G2217/0075—Process using an image-carrying member having an electrode array on its surface

Definitions

  • the invention relates to an image-forming element comprising a hollow cylindrical drum body which on an outer circumferential surface is provided with a plurality of circumferentially extending electrodes which are electrically insulated from one another, an electronic control unit disposed inside of the drum body for energizing said electrodes, and contact means for electrically connecting each of the electrodes individually to the control unit through the circumferential wall of the drum body.
  • the invention also relates to a method for manufacturing such an image-forming element.
  • An image-forming element of this type is usable in a so-called direct induction printer the function principle of which is described for example in EP-A1-0 247 699 .
  • the electrodes on the surface of the drum body are covered by a dielectric layer, and a rotatable sleeve is disposed along the drum body so that the surfaces of the drum body and the sleeve form a gap which extends at right angles to the electrodes of the drum.
  • a stationary magnetic knife is disposed inside of the sleeve for generating a magnetic field in the gap.
  • a uniform layer of electrically conductive and magnetically attractable toner powder is applied to the surface of the sleeve.
  • the toner powder is transferred onto the surface of the drum, depending on the voltage applied to the electrodes thereof.
  • a toner image is formed on the surface of the drum.
  • a uniform layer of toner powder may be applied to the surface of the drum, and the toner powder may selectively be removed from the drum in accordance with the energizing pattern of the electrodes.
  • a conventional image-forming element and a method of manufacturing the same are disclosed in EP-A1-0 595 388 .
  • the electronic components of the control unit and a pattern of electric conductors are provided on a plate-like substrate.
  • the conductors to be connected to the electrodes of the drum terminate at a rectilinear edge of the substrate, so that a terminal array is formed in which the individual terminals, i.e. the ends of the conductors, have the same pitch and the same width as the electrodes on the drum.
  • the substrate carrying the conductor pattern and the electronic components is mounted inside of the drum body such that the edge forming the terminal aray is inserted through a longitudinal slot of the drum body. The remaining free spaces in the slot are filled with epoxy resin so that the terminals are insulated from the drum body.
  • the edge portion of the substrate projecting out of the slot is etched away so that only the ends of conductors are left, which will then slightly project beyond the surface of the cylindrical drum.
  • the surface of the cylinder is then covered with an insulating layer having a thickness equal to the length of the projecting ends of the conductors. Then, the electrodes are formed on the insulating layer on the surface of the drum such that each electrode will be in contact with the end of one of the conductors.
  • the pitch of the electrodes determines the resolution of the printer. For example, in case of a printer with a resolution of 23,6 pixel per mm (600 dpi), the pitch of the electrodes will be no larger than approximately 40 ⁇ m. Since a sufficient insulating gap must be provided between adjacent electrodes, the width of each individual electrode will be as small as approximately 20 ⁇ m.
  • an image-forming element having the features indicated in the preamble of claim 1 is characterized in that said contact means are arranged in a plurality of rows extending substantially in axial direction of the body and in that each of the contact means considered from the inner side of the wall of said body has a dimension, seen in the axial direction of the body, which is at least twice the corresponding dimension of an electrode.
  • the contact means passing through the circumferential wall of the cylindrical body when considered from the inner side of the body and in the axial direction thereof, have a dimension which is considerably larger than the corresponding dimension of an electrode, an accurate connection with the electronic components of the control unit, disposed inside the cylindrical body, can be achieved.
  • an accurate connection between each of the contact means and one of the circumferentially extending printing electrodes can also be achieved without having the requirement of an extremely accurate positioning of the contact means passing through the wall of the cylindrical body.
  • a reliable and durable image-forming element can be manufactured without the requirement of an extreme accuracy in the positioning of the contact means.
  • the through-holes for contacting adjacent electrodes are staggered in circumferential direction of the drum, and each through-hole has a smaller diameter at the outer circumferential surface of the drum and a larger diameter at the inner surface of the drum body.
  • a method for manufacturing the image-forming element is specified in claim 6.
  • the through-holes may be formed in the wall of a drum body by means of a laser beam or an electron beam.
  • a laser beam or an electron beam.
  • the beam e.g. the laser beam
  • the convergence of the laser beam may be utilized to form the large diameter portion and the small diameter portion of the through-hole in a single operation.
  • the large diameter portion is formed as a blind bore in a first step, and the small diameter portion of the through-hole is then formed from inside or outside of the drum in a second step.
  • the through-hole having a large diameter is formed in a first step either from inside or outside of the drum.
  • the drum body which in this embodiment consists of a metal, such as aluminium, is then anodised in order to form an insulating surface layer at the internal walls of the large diameter bores, and these bores are filled with conductive material.
  • a uniform layer of metal (e.g. aluminum) or an insulating material (e.g. plastic such as epoxy resin) is applied over the outer surface of the drum body, and the through-contacts are completed in a second cycle of forming small diameter through-holes (anodising in case the applied layer consists of metal), and filling the holes with conductive material.
  • a metal layer is applied the anodising process must be so controlled that the whole thickness of the metal layer is made electrically insulating.
  • each row of contacts means can be formed on a separate support element and a number of such support elements is than secured in a corresponding elongated opening of the cylindrical body.
  • the drum body may be cut into at least two segments, beforehand, and the segments are then welded together for example by means of electron beam welding, after the through-holes or at least the large diameter portions thereof have been formed.
  • the electrodes on the outer surface of the drum body are formed by cutting grooves into the outer surface of the drum or the plated layer before the anodising step, and by filling these grooves with conductive material forming the electrodes after the anodising step.
  • the wall surfaces of both the through-holes and the grooves can be made electrically insulating in the same anodising step.
  • the image-forming element 10 shown in Fig. 1 comprises a hollow cylindrical drum body 12 made of metal, preferably aluminum or an aluminum alloy.
  • a plurality of circumferentially extending electrodes 14 are formed on the outer surface of the drum body 12. These electrodes 14 are electrically insulated from one another and from the drum body 12 and are covered by a thin layer of dielectric material (not shown in Fig. 1 ). While only a few electrodes 14 have been shown in Fig. 1 for reasons of clarity, the electrodes 14 are in practice provided substantially over the whole length of the drum body 12 and are arranged with a pitch of about 40 ⁇ m for example, corresponding to the desired resolution of the images to be formed.
  • a control unit 16 is shaped as an elongate body and is mounted inside of the hollow drum body 12 such that a terminal array 18 formed at a longitudinal edge of the elongate body adjoins the internal wall surface of the drum body.
  • the control unit 16 is arranged for individually applying a suitable high voltage to each of the electrodes 14 in accordance with the image information.
  • the control unit 16 may comprise a printed circuit board on which the electronic components are mounted and which carries a pattern of electrical conductors (not shown) which lead to the terminal array 18.
  • Each of the conductors is electrically connected to a corresponding one of the electrodes 14 by contact means which will be described in detail hereinafter.
  • each electrode 14 is electrically connected to the associated conductor of the control unit 16 via a through-hole 22 which penetrates the wall of the drum body 12 and is filled with an electrically conductive material such as electrically conductive epoxy resin, solder paste, electrically conductive polymers or the like.
  • Each through-hole 22 is composed of a small diameter portion or hole 24 and a large diameter portion or hole 26.
  • the small diameter hole 24 is open to the outer circumferential surface of the drum body, has a diameter of approximately 20 ⁇ m and is so arranged that it makes contact with only one of the electrodes 14.
  • the inner end of the small diameter hole 24 is open to the large diameter hole 26 which itself is open to the internal surface of the wall of the drum body 12 and has a diameter which is substantially larger than the pitch of the electrodes 14.
  • the through-holes 22 are staggered in circumferential direction of the drum in six rows of which only three have been shown in Fig. 2 .
  • control unit 16 When the control unit 16 is mounted inside the drum body 12, it has to be so adjusted that each of its conductors or terminals makes contact with the conductive material in only one of the large diameter holes 26. Because of the comparatively large diameter of these holes, the positional tolerance for the control unit is significantly larger than the pitch of the electrodes 14.
  • the electrodes 14 are formed as grooves separated by the ridges 20 and filled with electrically conductive material 28.
  • Fig. 3 also shows the dielectric layer 30 covering the electrodes 14 and the ridges 20 as well as the electrically conductive material 32 with which the small diameter portions 24 and the large diameter portions 26 of the through-holes 22 are filled.
  • the conductive materials 28, 32 forming the electrodes 14 and filling the through-holes is electrically insulated from the aluminum drum body 12 by an anodised surface layer 34 (Al2O3) which is present at the outer circumferential surface of the drum body and at the internal walls of the through-holes.
  • a so-called zebra-strip 36 is disposed at the inner wall surface of the drum body 12 in order to provide an electrical connection between the conductive material 32 filled in the large diameter holes 26 and the conductors of the control unit 16.
  • This zebra-strip 36 is made of a resilient material which is elastically pressed between the internal wall of the drum body 12 and the terminal array 18 of the control unit 16 and is composed of alternating layers 38 which are made electrically conductive and insulating layers 40.
  • each hole 26 overlaps with three conductive layers 38 of the zebra-strip, so that an electrical connection is assured via three parallel electrical paths. It will be clear that a zebra strip with a higher pitch results in more than three parallel electrical paths and thus ensures an even higher realiability. In order to keep the adjacent electrodes 14 electrically separated from each other, it is of course necessary to provide separate zebra-strips 36 for each of the rows of through-holes 22 shown in Fig. 2 , or to provide multiple row zebra strips.
  • the zebra-strips 36 may be replaced by a material which has an anisotropic electric conductivity such as an electrically anisotropic laquer.
  • the hollow cylindrical drum body 12 is formed as a one-piece member.
  • the grooves 14 which are to form the electrodes are then cut into the circumferential surface of the drum body 12 for example by means of a diamond chisel. Alternatively, these grooves may be formed by means of a laser beam or an electron beam. It should be noted, that, at this stage, the drum body 12 has not yet been anodised so that the grooves 14 are formed in a metal surface which can be machined more easily and more precisely than a metal oxide layer.
  • the large diameter holes 26 are cut into the wall of the drum body 12 from inside, for example by means of a laser beam.
  • the holes 26 are at first formed as blind bores, and the smaller emitter holes 24 are then formed in a second step.
  • the small diameter holes 24 may also be formed with a laser beam, either from inside or outside of the drum. If they are cut from outside of the drum, the positional relationship between the small diameter holes 24 and the grooves 14 can readily be confirmed. In this case, it will also be possible to form the small diameter holes 24 by punching or cutting with a diamond chisel or the like, instead of using a laser beam or an electron beam.
  • the small diameter holes 24 are formed from inside of the drum, it is possible to form the large diameter holes 26 and the small diameter holes 24 in a single step, e.g. by means of a convergent laser beam.
  • the whole drum body 12 is anodised according to known anodising techniques, so as to form the insulating metal oxide layer 32 on the whole surface of the drum body, especially on the outer circumferential surface forming the grooves 14 and the ridges 20 and on the internal walls of the through-holes 22.
  • the electrically conductive material 28, 32 is filled into the grooves 14 and into the through-holes 22 so as to complete the electrodes and the electrical through-contacts.
  • the insulating dielectric layer 30, which for example may be formed of AIN, Al 2 O 3 or of SiOx as described in EP-A-0 635 768 , is formed over the electrodes 14 and the ridges 20, and the control unit 16 is mounted inside of the drum body to be connected to the through-contacts via the zebra-strips 36.
  • the drum body 12 is composed of two or more segments in order to provide free access to the internal surface.
  • the large diameter holes 26 are formed by means of a laser beam or electron beam in the individual segments, and then the segments are joined and welded together, preferably by electron beam welding, in order to form the hollow cylindrical drum body 12.
  • the drum body is composed of two segments 12a joined together along weld seams 12b.
  • the outer surface of the drum body 12 is turned in order to obtain an exact cylindrical shape, and then the grooves 14 are cut. These steps are preferably performed on a lathe.
  • the drum body may be anodised immediately after the grooves 14 have been cut, i.e. before the small diameter holes 24 have been formed.
  • the anodising process must be so controlled that the insulating oxide layer penetrates into the aluminum body at least to the level of the outer ends of the large diameter holes 26.
  • the small diameter holes 24 are then formed in the oxide layer by laser cutting, punching or the like.
  • the large diameter hole 26 is at first formed through the entire wall thickness of the drum body 12, as is shown in Fig. 5 .
  • the drum body 12 is then anodised to form an insulating layer 42 on the outer circumferential surface of the drum body as well as the insulating surface layer 34 on the internal walls of the holes 26.
  • the holes 26 are filled with the electrically conductive material 32, as is shown in Fig. 6 .
  • a layer 44 of metallic aluminum is disposed on the layer 42 on the outer surface of the drum body, for example by vapour deposition. Thereafter, the grooves 14 are cut into the layer 44, as is also shown in Fig. 6 .
  • the drum body 12 is then subjected to a second anodising step in which the whole thickness of the layer 44 is transformed into an electrically insulating metal oxide. Finally, the small diameter holes 24 are formed through the insulating layer 44 and are filled with electrically conductive material to achieve the configuration shown in Fig. 7 .
  • the drum body 12 may either be an integral hollow cylindrical body from the outset or may be composed of several segments welded together after the holes 26 have been formed.
  • the large diameter holes 26 and the small diameter holes 24 may be formed in the same way as has been described in conjunction with Fig. 3 and 4 , but without forming the grooves 14 in the outer surface of the drum body. If the drum body is composed of several segments, these segments may be welded together either before or after the small diameter holes 24 have been formed. The drum body is then subjected to a first anodising step, and the large diameter holes 26 and the small diameter holes 24 are filled with conductive material 32. Then, as is shown in Fig. 8 , a continuous layer 46 of metallic aluminum is applied on the outer surface of the drum body 12, thus covering the open ends of the small diameter holes 24.
  • the grooves 14 are cut into the layer 46, so that the outward ends of the small diameter holes 24 are again exposed at the bottoms of the grooves.
  • the remaining parts of the layer 46 i.e. the ridges 20
  • grooves 14 are filled with conductive material 28, and the dielectric layer 30 is applied as has been described in conjunction with Fig. 3 .
  • Figs. 9-12 show another embodiment of an image-forming element of the invention.
  • the hollow cylindrical body 12 is provided with a number (e.g. four) elongated openings and in each such elongated opening a support element 41 is secured.
  • Each support element 41 as shown e.g. in fig. 10 comprises an insulating support 42 (or a conductive support provided with an insulating surface layer), on which a row of contact means 43 is carried.
  • the contact means 43 in this embodiment have a rectangular cross-section, but obviously may also have a circular or otherwise shaped cross-section.
  • the length of the contact means, when considered in axial direction of the cylindrical body 12 is about three to four times the corresponding length of the electrodes 46 ( Fig.
  • the electrodes 46 are 40 ⁇ m wide in axial direction of body 12 and contact means 43 measure 150 ⁇ m.
  • the support elements 41 are secured in the elongated opening of the body 12 with an insulating adhesive such as an electrograde epoxy resin, and in such a way that the element 41 projects about 50 to 100 ⁇ m above the surface of the body 12.
  • the elements 41 can be secured in the elongated opening such that the end of the element is positioned at the surface of the drum body 12 but does not substantially protrude from the surface. Subsequently the drum body 12 can be etched away to such a depth that the elements 41 protrude about 50 to 100 ⁇ m above the surface.
  • the elements 41 are further so adjusted that the contact means 43, considered in the peripheral direction of body 12 are staggered in the same manner as described hereinbefore with reference to Fig. 2 .
  • the peripheral surface of body 12 is subsequently coated with an insulating surface layer 45 having a thickness such that the thickness of the layer section covering the support element 41, after the layer 45 is finished to achieve a cylindrical periphery, amounts to about 100 ⁇ m.
  • the image forming electrodes 46 are formed by forming (e.g. on a lathe or using a laser beam) in the outer surface of the insulating layer 45 a number of endless grooves 44 peripherally extending parallel to one another.
  • the grooves have a depth of about 40 ⁇ m, but in the region where the electrode 46, must be connected with contact means 43, the groove 44 is deepened until the conductive material forming the contact means 43 is exposed. The grooves 44 are then filled with electrically conductive material as described herein before with reference to Figs. 3 and 4 . Finally, the peripheral surface of the layer 45 and electrodes 46 is provided with a thin dielectric layer (not shown in the figures) having a thickness of approximately 1 ⁇ m and consisting of silicon oxide as described in EP-A-0 635 768 .
  • the contact means 43 are connected with a control unit (not shown in the Figs. 9-12 ) for selectively energising the electrodes 46 in the same manner as described before with reference to Fig. 4 .
  • the image-forming element as disclosed herein is used in a so-called direct induction printing process which is described in EP-A1-0 247 699 and even more in detail is disclosed in EP-A1-0 191 521 .
  • the image-forming element moves through an imaging zone in which a rotating conductive sleeve is arranged in close proximity to the surface of the image-forming element.
  • a stationary magnetic system is arranged within the conductive sleeve and creates a magnetic field in the gap between the sleeve and the image-forming element.
  • Electrically conductive toner powder is supplied in the gap, by the rotating sleeve or the moving image-forming element.
  • the conductive sleeve and the electrodes of the image-forming element are held at the same potential, i.e. ground potential.
  • a toner powder image is formed on the dielectric surface of the image-forming element as it leaves the imaging zone.
  • the recording potential, selectively applied to the electrodes may be either positive or negative with respect to the sleeve and has a magnitude such that a sufficient amount of toner powder is attracted to the overlying surface of the dielectric layer to form a toner image.
  • the voltage difference between electrode and sleeve must amount between about 10 to about 60 Volts.
  • the conductive sleeve may be provided with a potential slightly differing from ground potential and being approximately equal (in polarity and magnitude) to the potential acquired by an electrode when its neighbour electrode(s) are energized.
  • the image-forming element in an area outside the area used for image recording, may be provided with a measuring electrode as shown in fig. 13 .
  • the measuring electrode 51 at a point 52 most remote from the point 53 where the electrode is connected with the energising means 54, is connected with a means 55 for measuring the potential at point 52 when neighbouring electrodes are energised for image formation.
  • the potential measured at point 52 if desired after multiplication with a factor between about 0.5 and 1, is supplied to the conductive sleeve 56.
  • the method as described above can also be used if the printing process is executed as described in EP-A- 0 718 721 , wherein images are recorded by alternately bringing the image-forming electrodes to a positive and a negative potential with respect to the sleeve. If an image is recorded in the embodiment in which a positive (or negative) potential is applied to the electrodes when they are not involved in image-formation and ground potential is applied if they are involved in image-formation, the measuring electrode 51 is kept at the potential that is applied to the electrodes when they are not involved in image-formation and the sleeve 56 is brought to the potential which is acquired by the measuring electrode, when neighbouring electrodes are switched to ground potential.
  • control unit 16 may be divided into several blocks angularly offset from one another and extending each over a different part of the length of the drum body.
  • the through-holes 22 will then be arranged in accordance with this pattern.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)

Claims (12)

  1. Bilderzeugungselement mit:
    - einer hohlen zylindrischen Trommel (12), die eine Wand hat, deren äußere Umfangsfläche eine Vielzahl von in Umfangsrichtung verlaufenden Elektroden (14) trägt, die elektrisch voneinander und von der Trommel isoliert sind,
    - einer elektronischen Steuereinheit (16), die im Inneren der Trommel (12) angeordnet ist und dazu dient, die Elektroden (14) zu erregen, und
    - einer Vielzahl von Kontaktmitteln (22) zum individuellen elektrischen Verbinden jeder der Elektroden (14) mit der Steuereinheit (16), wobei die Kontaktmittel duch die Wand der Trommel (12) hindurchgehen, dadurch gekennzeichnet, daß die Kontaktmittel (22) in mehreren Reihen angeordnet sind, die sich in der axialen Richtung der Trommel (12) erstrecken, und daß jedes der betreffenden Kontaktmittel (22) an der inneren Oberfläche der Wand der zylindrischen Trommel (12) eine Abmessung hat, die, in der axialen Richtung der Trommel (12) gesehen, wenigstens das Zweifache der Breite einer Elektrode (14) beträgt.
  2. Bilderzeugungselement nach Anspruch 1, dadurch gekennzeichnet, daß jedes der Kontaktmittel (22) ein durchgehendes Loch aufweist, das einen Abschnitt (24) mit kleinem Durchmesser, der sich an eine zugehörige der Elektroden (14) anschließt, und einen Abschnitt (26) aufweist, der einen Durchmesser hat, der wenigstens das Zweifache der Breite der Elektrode (14) beträgt und der zur inneren Oberfläche der zylindrischen Trommel (12) offen ist, wobei die durchgehenden Löcher eine isolierende Innenwand haben und mit elektrischem leitfähigem Material (32) gefüllt sind.
  3. Bilderzeugungselement nach Anspruch 2, bei dem die zylindrische Trommel (12) aus Metall besteht, dadurch gekennzeichnet, daß die isolierende innere Wand der durchgehenden Löcher durch eine anodisierte Oberflächenschicht des Metalls der zylindrischen Trommel (12) gebildet wird.
  4. Bilderzeugungselement nach Anspruch 1 oder 2, bei dem wenigstens ein durchgehender Streifen (36) mit anisotroper elektrischer Leitfähigkeit zwischen den inneren Enden der Kontaktmittel (22) und einer linearen Anordnung (18) von Kontaktklemmen der Steuereinheit (16) eingefügt ist.
  5. Bilderzeugungselement nach Anspruch 1, dadurch gekennzeichnet, daß die Reihen der Kontaktmittel (22) an einem oder mehreren Trägern (41) vorgesehen sind, die in der Umfangswand der zylindrischen Trommel (12) montiert sind.
  6. Verfahren zur Herstellung eines Bilderzeugungselements nach Anspruch 1, mit den folgenden Schritten:
    - Herstellen einer Vielzahl von durchgehenden Löchern (22) in der Wand einer hohlen, zylindrischen metallenen Trommel (12) oder eines Segments (12a) derselben an Stellen, die einem vorbestimmten Muster von Elektroden (14) entsprechen,
    - Herstellen einer anodisierten Oberflächenschicht (34) zumindest an den Innenwänden der durchgehenden Löcher (22), und
    - Füllen der durchgehenden Löcher (22) mit elektrisch leitfähigem Material (32).
  7. Verfahren nach Anspruch 6, bei dem die durchgehenden Löcher (22) oder zumindest deren Abschnitte (26) mit großem Durchmesser von der Innenseite der Trommel (12) oder des Segments (12a) her gebildet werden.
  8. Verfahren nach Anspruch 7, bei dem die durchgehenden Löcher (22) oder zumindest deren Abschnitte (26) mit großem Durchmesser in ein oder mehreren Segmenten (12a) hergestellt werden, bevor diese Segmente zusammengeschweißt werden, um die Trommel (12) zu bilden.
  9. Verfahren nach einem der Ansprüche 6 bis 8, bei dem die Elektroden (14) gebildet werden, indem vor dem Anodisierungsschritt Nuten in die Metalloberfläche der Trommel (12) geschnitten werden und diese Nuten nach dem Anodisierungsschritt mit elektrisch leitfähigem Material (28) gefüllt werden.
  10. Verfahren nach einem der Ansprüche 6 bis 8, mit den folgenden Schritten:
    - Herstellen von Löchern (26) mit großem Durchmesser durch die gesamte Dicke der Wand der Trommel oder des Segments (12a) hindurch,
    - Herstellen einer anodisierten Oberflächenschicht (34) zumindest an den Innenwänden der Löcher (26),
    - Füllen der Löcher (26) mit elektrisch leitfähigem Material (32),
    - Anbringen einer metallischen Schicht (44) an der äußeren Oberfläche der Trommel (12) und
    - Herstellen von Löchern (24) mit kleinem Durchmesser durch die aufgebrachte metallische Schicht (44) hindurch an Stellen, die jeweils mit den Positionen der Löcher (26) mit großem Durchmesser zusammenfallen, und vollständiges Anodisieren der aufgebrachten Oberflächenschicht (44) entweder vor oder nach der Bildung der Löcher (24) mit kleinem Durchmesser.
  11. Verfahren nach Anspruch 10, bei dem die Nuten (14), die die Elektroden bilden sollen, in die aufgetragene Metallschicht (44) eingeschnitten werden, bevor diese anodisiert wird.
  12. Verfahren nach einem der Ansprüche 6 bis 11, bei dem die durchgehenden Löcher (22) durch Laserstrahlschneiden, Elektronenstrahlschneiden, Stanzen oder eine Kombination dieser Techniken hergestellt werden.
EP19970201203 1996-04-25 1997-04-22 Bildaufzeichnungsträger und Verfahren zu seiner Herstellung Expired - Lifetime EP0803783B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP19970201203 EP0803783B1 (de) 1996-04-25 1997-04-22 Bildaufzeichnungsträger und Verfahren zu seiner Herstellung

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP96201107 1996-04-25
EP96201107 1996-04-25
EP19970201203 EP0803783B1 (de) 1996-04-25 1997-04-22 Bildaufzeichnungsträger und Verfahren zu seiner Herstellung

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EP0803783A1 EP0803783A1 (de) 1997-10-29
EP0803783B1 true EP0803783B1 (de) 2008-10-29

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JP4815196B2 (ja) 2004-11-25 2011-11-16 オセ−テクノロジーズ・ベー・ヴエー 画像生成電極を駆動するマルチプレックス回路を有する、プリント装置のための画像生成素子
EP1679560A3 (de) 2004-11-25 2006-08-02 Océ-Technologies B.V. Bilderzeugungselement für ein Druckergerät mit Multiplexschaltung zur Ansteuerung der Bilderzeugungselektroden
EP1739500B1 (de) * 2005-06-27 2014-10-01 Océ-Technologies B.V. Bilderzeugungselement mit mehreren umkreisenden Elektroden
KR100653201B1 (ko) * 2005-11-30 2006-12-05 삼성전자주식회사 이미지 드럼 및 이미지 드럼의 제조방법
US9061291B2 (en) 2009-07-10 2015-06-23 Alfa Laval Corporate Ab Gas cleaning separator
US8764869B2 (en) 2009-07-10 2014-07-01 Alfa Laval Corporate Ab Gas cleaning separator
US8673038B2 (en) 2009-07-10 2014-03-18 Alfa Laval Corporate Ab Gas cleaning separator
US8657909B2 (en) 2009-07-10 2014-02-25 Alfa Laval Corporate Ab Gas cleaning separator
US8657908B2 (en) 2009-07-10 2014-02-25 Alfa Laval Corporate Ab Gas cleaning separator
US8657913B2 (en) 2009-07-10 2014-02-25 Alfa Laval Corporate Ab Gas cleaning separator
US9056319B2 (en) 2009-07-10 2015-06-16 Alfa Laval Corporate Ab Gas cleaning separator
KR101431922B1 (ko) 2009-07-10 2014-08-19 알파 라발 코포레이트 에이비 기체 세정 분리장치
US8679214B2 (en) 2009-07-10 2014-03-25 Alfa Laval Corporate Ab Gas cleaning separator

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NL8601376A (nl) * 1986-05-29 1987-12-16 Oce Nederland Bv Beeldvormingselement voor een elektrostatische drukinrichting, alsmede een drukinrichting waarin zulk een element wordt toegepast.
NL9201892A (nl) * 1992-10-30 1994-05-16 Oce Nederland Bv Werkwijze voor het vervaardigen van een beeldregistratie-element.
NL9301300A (nl) * 1993-07-23 1995-02-16 Oce Nederland Bv Beeldvormingsinrichting, alsmede een beeldregistratie-element voor toepassing daarin.

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