EP0050674B1 - Method and recording member coated with an electro-sensitive layer recording colored information and reproducing originals - Google Patents

Method and recording member coated with an electro-sensitive layer recording colored information and reproducing originals Download PDF

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Publication number
EP0050674B1
EP0050674B1 EP19800106509 EP80106509A EP0050674B1 EP 0050674 B1 EP0050674 B1 EP 0050674B1 EP 19800106509 EP19800106509 EP 19800106509 EP 80106509 A EP80106509 A EP 80106509A EP 0050674 B1 EP0050674 B1 EP 0050674B1
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EP
European Patent Office
Prior art keywords
raster
recording
multicolour
colour
elements
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EP19800106509
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German (de)
French (fr)
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EP0050674A1 (en
Inventor
Stefan Ing. Kudelski
Jean-Claude Ing. Schlup
Werner Jung
Hans-Georg Dipl.-Ing. Mall
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Robert Bosch GmbH
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Robert Bosch GmbH
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Priority to EP19800106509 priority Critical patent/EP0050674B1/en
Priority to DE8080106509T priority patent/DE3069983D1/en
Publication of EP0050674A1 publication Critical patent/EP0050674A1/en
Application granted granted Critical
Publication of EP0050674B1 publication Critical patent/EP0050674B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/24—Ablative recording, e.g. by burning marks; Spark recording
    • B41M5/245—Electroerosion or spark recording

Definitions

  • the invention is based on a method according to the preamble of claim 1 and on a record carrier according to the preamble of claim 10.
  • a corresponding method and an associated record carrier are known from FR-A-2 197 345.
  • the method described in this document is used to produce a multicolored recording on a carrier material which is printed with colored strips so that adjacent strips have a different color, but after two or more strips the colors repeat in the same order.
  • the selection of a specific color is carried out in that one or more pens receive signals for burning out a metallic registration layer in synchronism with specific colors of the color strips of the recording medium which are moved past them, thereby exposing the underlying color layer.
  • the writing electrodes are each advanced by a constant feed amount, which corresponds to the distance between two adjacent color elements, i.e. the individual electrodes are clocked in accordance with the predetermined constant feed grid.
  • a recording method is known from US Pat. No. 3,679,818, in which a plurality of laser beams are used for the multi-color display, which are spatially congruent with a color element grid and whose radiation frequency corresponds to the color of the color element used.
  • the laser beam can thus penetrate the corresponding color element non-destructively and burn out an opaque layer behind it, so that the color element is visible.
  • the method with a single-beam laser shown in FIG. 6 of this document does not allow selection and recording of different colors, since the single beam must be matched to the color of a specific color element. Accordingly, here too the laser beam carries out a feed movement in accordance with a constant grid dimension.
  • a record carrier according to the preamble of claim 10 is also known from FR-A-2 197 345.
  • the marking or reference points are provided on the edge of the carrier, so that an exact electrode positioning cannot be set or monitored directly at the recording location.
  • the reference points in question are not formed by specially treated color elements, rather the reference points consist of end sections of the color strips which have no metallic cover layer.
  • the recording medium shown in US Pat. No. 3,995,083 has cutouts as markings in which both the colored area and the metallic cover layer are missing, so that gaps are formed in the registration area.
  • markings are also not reference points for controlling or checking the position of a writing electrode, but rather markings in the form of a lettering or characters which facilitate the evaluation of the recording.
  • a transparent lacquer is used to produce the color layer or the correspondingly colored base body is made of transparent plastic.
  • inventive method with the characterizing features of claim 1 and the inventive design of the recording medium according to claim 10 have the advantage that colored information content and in particular multi-colored images can be recorded true to the original with known and proven electrosensitive recording methods, if at each burn-out point of the writing electrode exactly above the the writing current is supplied to the color element of the multicolor grid corresponding to the desired color.
  • the recording grid is adjusted relative to the multicolor grid in accordance with the position of the desired color elements in the multicolor grid.
  • phase signals are also derived from the individual information or scanning signals, which trigger the electrical write pulses in synchronism with the position of the color element to be exposed within the grid of the color element group.
  • the desired color effect is achieved in a similar way to color television or multi-color printing using the additive or subtractive color mixing method.
  • the multicolor screen can be formed by correspondingly coloring the supporting base body or by applying a layer of lacquer to the base body. This can be done with the method according to claim 9, in particular in multi-color offset printing.
  • the individual color elements of the grid can, for example, have a round, elongated or oval shape that is transverse to the line direction.
  • a method is particularly advantageous in which the multicolor grid of the recording medium used consists of honeycomb-shaped color elements, as a result of which gaps between the color elements are avoided and good color reproduction can be achieved.
  • This shape can largely correspond to the shape of a burnout point, which in turn largely corresponds to the cross-sectional shape of the burnout electrode.
  • the size of the individual color elements is suitably chosen to be smaller than the resolution of the human eye. With a normal viewing distance of 30 cm, this means an element or point size of at most 0.15 mm diameter or side distance.
  • a precise positioning of the write head in relation to the record carrier can be achieved if a record carrier provided with markings is used, the markings being detected or evaluated by detectors attached to the write head or moved synchronously with the latter.
  • the markings can be used to correct the position of the write head, which could be necessary due to changes in the surface area of the record carrier due to moisture absorption and the associated relative displacements of the multicolor screen with respect to the write electrode.
  • the markings can also be used to synchronize the writing electrode and probe in the recording device, to trigger counting pulses, to read out the memory, and to control a positioning device which, at the beginning of each new line, displaces the color element groups in this line from those in the adjacent lines compensated by appropriate displacement of the record carrier or the control electrode.
  • a recording medium the markings of which are designed as reference points and lie precisely aligned with the multicolor grid within the recording field.
  • the greatest possible distance between the reference points and the color elements of a certain color is equal to the number of colors available multiplied by the diameter or the "key width" of the color elements, so that the positioning error of the writing electrode caused by the inevitable moisture expansion of the paper is kept negligible can be.
  • the reference points of the record carrier are formed here in particular by specially treated color elements in the multicolor grid of the record carrier itself, so that they can be clearly recognized by the writing instrument and on the other hand do not impair or falsify the image content. All elements of one color are preferably designed as reference points.
  • the special treatment of the color elements of the multicolor grid serving as reference points can consist in that the color of these reference points is provided with a magnetic powder in addition to the normal pigmentation.
  • Another advantageous possibility for highlighting the reference points is that they have a different gloss value than the other color elements, which is optically recognizable through the electrosensitive covering.
  • FIGS. 3 to 6 show a top view of a recording medium with markings running perpendicular to the line direction at the beginning and end of the recording field.
  • FIG. 8 schematically shows a device for recording multicolored images using the method according to the invention. Description of the embodiments and the device
  • the base body 1 has an electrically insulating base body 1 and a metal film 2 which is vacuum-deposited onto the base body 1.
  • the base body 1 consists of a translucent plastic, which according to the desired multi-color grid in the Mass is colored polychrome.
  • This record carrier is suitable for evaluation in devices in which the record carrier is illuminated by a light source from the side facing away from the viewer.
  • the 2 has a basic body 3 made of any, but electrically insulating material, e.g. Paper on which a lacquer layer 4 or color layer is applied or printed to form the multicolor screen.
  • the lacquer layer 4 is covered by a vapor-deposited metal film 2. This record carrier can be evaluated by direct reading.
  • the multicolor screen can have one of the configurations shown in FIGS. 3 to 6.
  • 3 consists of round color elements 6, for example with the colors yellow, green and red.
  • the yellow color elements are marked white in the drawing, the green with cross-hatching and the red with cross-hatching.
  • the color elements 6 are arranged in the same direction, which is indicated by the arrow 7, in a constant, periodically repeating order, so that successive color element groups 8 are formed, in which the elements of the same colors each occupy the same position.
  • the color element groups 8 of one row are arranged offset to the groups 8 of the adjacent row, so that there is a spatial distribution of the elements of the grid of the same color.
  • the size of the color elements 6 is dimensioned such that each color point in the metal film 2 is assigned a color element group 8.
  • FIGS. 4 and 5 consists of individual color elements 10, which have an elongated shape with a longitudinal axis lying in the line direction 11.
  • 5 consists of oval color elements 12, the longitudinal axis of which is transverse to the line direction 13.
  • the grids according to FIGS. 4 and 5 are also formed from color elements of three different colors, which are grouped into periodically repeating groups of color elements 14 and 15, respectively.
  • the 6 has hexagonal color elements 16 arranged in a honeycomb shape, which abut one another without a gap, so that the entire recording field is covered with color.
  • the color elements 16 alternately have the colors black, yellow, blue and red, which are also combined into color element groups 17, which are repeated periodically.
  • the color element groups 17 are offset from one another in adjacent lines such that the elements of one color are distributed uniformly over the entire recording field.
  • the “key width” s of a color element 16 is less than or equal to 0.15 mm, so that the color grid can no longer be resolved by the human eye at a normal viewing distance of approximately 30 cm.
  • the black color elements 18 of the multicolor screen are identified by hatching, while the other, periodically repeating colors are not identified in detail.
  • the color of the black color elements 18 has added a magnetizable powder which has been magnetized before the recording medium is written on.
  • an optical transmission can also be provided.
  • the reference points 18 can have a different degree of gloss than the other color elements of the grid, in such a way that they can be recognized even after the metallization with the aid of an optical scanning device, consisting of incident light illumination and a light-sensitive sensor. Both reference systems can also be used together, e.g.
  • the magnetic reference points can be used for positioning in the x-axis and the optical reference points for positioning in the y-axis.
  • FIG. 7 shows a recording medium 20 which is provided with additional marking lines 25 and 26 at both border zones 22 and 23 of its metallized area 24 which run perpendicular to the writing direction 21.
  • the mutual spacing of the marking lines 25 corresponds to the spacing between the elements of a color in a line of the multicolor grid. They can be used, for example, to make it easier to select the colors at the start of the recording, but also for other reference purposes.
  • the marking lines 26 at the other end of the metallized area 24 can be used, for example, for detecting and evaluating the surface expansion of the award carrier caused by moisture absorption. If the marking lines lie outside of the metallized area 24, they can also be detected optically.
  • the record carrier could also be on the back facing away from the electrosensitive surface with e.g. optically recognizable and evaluable reference marks.
  • the device shown in FIG. 8 for carrying out the method according to the invention has two fixed supports 30, 31, via which a flexible recording medium 32 by means of a transport device 33, 34 in Rich direction of arrow A can be pulled away.
  • a writing electrode 35 in the area of the support 31 and in the area of the support 30 there is a large counter electrode 36 which is designed as an idling roller.
  • the electrodes 35, 36 are connected to an electrical pulse generator 37, which controls the write electrode 35 and the drive device 33, 34 in accordance with write signals U1 and phase signals u 2 in such a way that a grid corresponding to the original to be reproduced is formed on the recording medium 32.
  • the phase signals U2 have the task of positioning the write electrode 35 relative to the recording medium with each burn-out pulse in such a way that the desired color element of the color element group is exposed within the multicolor screen.

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  • Printing Methods (AREA)
  • Heat Sensitive Colour Forming Recording (AREA)

Description

Die Erfindung geht aus von einem Verfahren nach der Gattung des Anspruches 1 und von einem Aufzeichnungsträger nach der Gattung des Anspruches 10. Ein entsprechendes Verfahren' und ein zugehöriger Aufzeichnungsträger sind aus der FR-A-2 197 345 bekannt. Das in dieser Druckschrift beschriebene Verfahren dient zur Herstellung einer mehrfarbigen Aufzeichnung auf einem Trägermaterial, welches mit farbigen Streifen so bedruckt ist, dass nebeneinanderliegende Streifen eine unterschiedliche Farbe besitzen, jedoch nach zwei oder mehr Streifen sich die Farben in gleicher Reihenfolge wiederholen. Die Auswahl einer bestimmten Farbe erfolgt dadurch, dass ein oder mehrere Schreibstifte synchron mit bestimmten Farben der unter ihnen vorbeibewegten Farbstreifen des Aufzeichnungsträgers Signale erhalten zum Ausbrennen einer metallischen Registrierschicht, wodurch die darunterliegende Farbschicht freigelegt wird. Hierbei werden die Schreibelektroden jeweils um einen konstanten Vorschubbetrag vorbewegt, welcher dem Abstand zweier banachbarter Farbelemente entspricht, d.h., die Einzelelektroden werden entsprechend dem vorgegebenen konstanten Vorschubraster getaktet.The invention is based on a method according to the preamble of claim 1 and on a record carrier according to the preamble of claim 10. A corresponding method and an associated record carrier are known from FR-A-2 197 345. The method described in this document is used to produce a multicolored recording on a carrier material which is printed with colored strips so that adjacent strips have a different color, but after two or more strips the colors repeat in the same order. The selection of a specific color is carried out in that one or more pens receive signals for burning out a metallic registration layer in synchronism with specific colors of the color strips of the recording medium which are moved past them, thereby exposing the underlying color layer. Here, the writing electrodes are each advanced by a constant feed amount, which corresponds to the distance between two adjacent color elements, i.e. the individual electrodes are clocked in accordance with the predetermined constant feed grid.

Aus der US-A 3 679 818 ist ein Aufzeichnungsverfahren bekannt, bei dem zur mehrfarbigen Darstellung mehrere Laserstrahlen verwendet werden, die räumlich deckungsgleich zu einem Farbelementeraster angeordnet sind und deren Strahlungsfrequenz der Farbe des bereffenden Farbelementes entspricht. Der Laserstrahl kann somit das entsprechende Farbelement zerstörungsfrei durchdringen und eine dahinterliegende opake Schicht ausbrennen, so dass das Farbelement sichtbar wird. Das anhand von Figur 6 dieser Druckschrift gezeigte Verfahren mit einem Einzelstrahllaser erlaubt keine Auswahl und Aufzeichnung verschiedener Farben, da der Einzelstrahl auf die Farbe eines bestimmten Farbelementes abgestimmt sein muss. Demgemäss führt auch hier der Laserstrahl eine Vorschubbewegung entsprechend einem konstanten Rastermass aus.A recording method is known from US Pat. No. 3,679,818, in which a plurality of laser beams are used for the multi-color display, which are spatially congruent with a color element grid and whose radiation frequency corresponds to the color of the color element used. The laser beam can thus penetrate the corresponding color element non-destructively and burn out an opaque layer behind it, so that the color element is visible. The method with a single-beam laser shown in FIG. 6 of this document does not allow selection and recording of different colors, since the single beam must be matched to the color of a specific color element. Accordingly, here too the laser beam carries out a feed movement in accordance with a constant grid dimension.

Ein Aufzeichnungsträger gemäss Gattungsbegriff des Anspruches 10 ist ebenfalls aus der FR-A-2 197 345 bekannt. Bei dem dort offenbarten Aufzeichnungsträger sind die Markierungs- bzw. Referenzpunkte am Trägerrand vorgesehen, so dass eine exakte Elektrodenpositionierung unmittelbar am Aufzeichnungsort nicht eingestellt oder überwacht werden kann. Ausserdem sind bei diesem Stand der Technik die betreffenden Referenzpunkte nicht durch speziell behandelte Farbelemente gebildet, vielmehr bestehen die Referenzpunkte aus Endabschnitten der Farbstreifen, welche keine metallische Deckschicht besitzen.A record carrier according to the preamble of claim 10 is also known from FR-A-2 197 345. In the recording medium disclosed there, the marking or reference points are provided on the edge of the carrier, so that an exact electrode positioning cannot be set or monitored directly at the recording location. In addition, in this prior art, the reference points in question are not formed by specially treated color elements, rather the reference points consist of end sections of the color strips which have no metallic cover layer.

Der in der US-A 3 995 083 gezeigte Aufzeichnungsträger besitzt als Markierungen Aussparungen, an denen sowohl die Farbfläche als auch die metallische Deckschicht fehlt, so dass Lücken in der Registrierfläche entstehen.The recording medium shown in US Pat. No. 3,995,083 has cutouts as markings in which both the colored area and the metallic cover layer are missing, so that gaps are formed in the registration area.

Bei diesen Markierungen handelt es sich auch nicht um Referenzpunkte zur Steuerung oder Überprüfung der Lage einer Schreibelektrode sondern um Markierungen in Form eines Schriftzuges oder von Zeichen, welche die Auswertung der Aufzeichnung erleichtern.These markings are also not reference points for controlling or checking the position of a writing electrode, but rather markings in the form of a lettering or characters which facilitate the evaluation of the recording.

Andere bekannte Verfahren verwenden Aufzeichnungsträger, welche die Form von Blättern oder Bändern haben. Der elektrosensitive Belag der Aufzeichnungsträger, der beispielsweise aus Zink, Aluminium oder einer Zink-Cadmiumlegierung bestehen kann, ist auf einen elektrisch isolierenden Grundkörper im Vakuum aufgedampft. In den elektrosensitiven Belag wird ein dem zu reproduzierenden Original entsprechendes Raster mit Hilfe einer oder mehrerer Schreibelektroden eingebrannt, welche beispielsweise Linie für Linie über den Aufzeichnungsträger gezogen und aus einer elektrischen Energiequelle entsprechend des aufgenommenen Tastsignalen mit einer modulierenden Spannung oder mit gesteuerten Stromimpulsen beaufschlagt werden. Zur Erhöhung des Kontrastes und der Korrosionsbeständigkeit ist es bekannt, unter dem elektrosensitiven Belag eine schwarze Farbschicht anzuordnen, wodurch die eingeschriebenen Inhalte bei Betrachtung von oben leichter erkennbar werden.Other known methods use record carriers which are in the form of sheets or tapes. The electrosensitive coating on the recording medium, which can consist, for example, of zinc, aluminum or a zinc-cadmium alloy, is evaporated onto an electrically insulating base body in a vacuum. A grid corresponding to the original to be reproduced is burned into the electrosensitive covering with the aid of one or more writing electrodes, which are drawn, for example, line by line over the recording medium and subjected to a modulating voltage or controlled current pulses from an electrical energy source in accordance with the recorded probe signals. To increase the contrast and the corrosion resistance, it is known to arrange a black color layer under the electrosensitive covering, which makes the inscribed content easier to see when viewed from above.

Wenn die beschriebenen Aufzeichnungsträger in Betrachtungsgeräten lesbar sein sollen, in welchen sie von unten her angestrahlt werden, oder wenn der Informationsinhalt der Aufzeichnungsträger pausfähig sein soll, wird ein transparenter Lack zur Herstellung der Farbschicht verwendet oder der entsprechend eingefärbte Grundkörper aus transparentem Kunststoff hergestellt.If the described recording media are to be readable in viewing devices in which they are illuminated from below, or if the information content of the recording media is to be traceable, a transparent lacquer is used to produce the color layer or the correspondingly colored base body is made of transparent plastic.

Mit Verfahren und Aufzeichnungsträgern dieser Gattung lassen sich jedoch nur Reproduktionen in Schwarz-Weiss oder in dazwischenliegenden Grautönen übertragen, deren Helligkeit durch entsprechende Abstimmung der Rasterteilung zu der Grösse der ausgebrannten Rasterpunkte eingestellt bzw. verändert werden kann.With methods and record carriers of this type, however, only reproductions in black and white or in shades of gray in between can be transferred, the brightness of which can be adjusted or changed by appropriate adjustment of the grid division to the size of the burned-out grid points.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemässe Verfahren mit den kennzeichnenden Merkmalen des Anspruches 1 und die erfindungsgemässe Ausbildung des Aufzeichnungsträgers nach Anspruch 10 haben den Vorteil, dass farbige Informationsinhalte und insbesondere mehrfarbige Bilder mit bekannten und bewährten elektrosensitiven Aufzeichnungsverfahren originalgetreu aufgezeichnet werden können, wenn an jeder Ausbrennstelle der Schreibelektrode exakt über dem der gewünschten Farbe entsprechenden Farbelement des Mehrfarbenrasters der Schreibstrom zugeführt wird.The inventive method with the characterizing features of claim 1 and the inventive design of the recording medium according to claim 10 have the advantage that colored information content and in particular multi-colored images can be recorded true to the original with known and proven electrosensitive recording methods, if at each burn-out point of the writing electrode exactly above the the writing current is supplied to the color element of the multicolor grid corresponding to the desired color.

Bei einfarbiger Wiedergabe von Informationsinhalten wird zur exakten Anwahl der gewünschten Farbelemente vorgeschlagen, dass zu Beginn der Aufzeichnung oder am Anfang einer jeden Schreibzeile das Aufzeichnungsraster gegenüber dem Mehrfarbenraster entsprechend der Stellung der gewünschten Farbelemente im Mehrfarbenraster einjustiert wird.In the case of single-color reproduction of information content, it is proposed for the exact selection of the desired color elements that at the beginning of the recording or at the beginning of each writing line, the recording grid is adjusted relative to the multicolor grid in accordance with the position of the desired color elements in the multicolor grid.

Bei mehrfarbigen Aufzeichnungen, insbesondere bei Wiedergabe von Farbbildern, wird zur exakten Anwahl der gewünschten Farbelemente vorgeschlagen, dass aus den eizelnen Informations- bzw. Abtastsignalen auch Phasensignale abgeleitet werden, welche die elektrischen Schreibimpulse synchron zu der Stellung des jeweils freizulegenden Farbelements innerhalb des Rasters der Farbelementegruppe auslösen. Auf diese Weise wird ähnlich wie beim Farbfernsehen oder bei Mehrfarbendrucken nach dem additiven bzw. subtraktiven Farbmischverfahren der gewünschte Farbeffekt erzielt.In the case of multicolored recordings, in particular when reproducing color images, the ex Actual selection of the desired color elements suggests that phase signals are also derived from the individual information or scanning signals, which trigger the electrical write pulses in synchronism with the position of the color element to be exposed within the grid of the color element group. In this way, the desired color effect is achieved in a similar way to color television or multi-color printing using the additive or subtractive color mixing method.

Zur Wiedergabe von Mischfarben wird ein Verfahren bzw. ein Aufzeichnungsträger vorgeschlagen, bei welchem das Mehrfarbenraster nach den Ansprüchen 4 oder 5 ausgebildet ist. Bei Ausbildung nach Anspruch 5 ist erreicht, dass auch zur Darstellung von Grundfarben zwei Farbelemente je Ausbrennstelle freigelegt werden müssen, wodurch der Kontrast des Bildes verbessert werden kann.To reproduce mixed colors, a method or a recording medium is proposed, in which the multicolor screen is designed according to claims 4 or 5. In the embodiment according to claim 5 it is achieved that two color elements per burnout point must also be exposed for the display of primary colors, whereby the contrast of the image can be improved.

Das Mehrfarbenraster kann durch entsprechende Einfärbung des tragenden Grundkörpers oder aber durch Auftragen einer Lackschicht auf den Grundkörper gebildet sein. Das kann mit dem Verfahren nach Anspruch 9, insbesondere im Mehrfarben-offsetdruck, geschehen.The multicolor screen can be formed by correspondingly coloring the supporting base body or by applying a layer of lacquer to the base body. This can be done with the method according to claim 9, in particular in multi-color offset printing.

Die einzelnen Farbelemente des Rasters können beispielsweise eine runde, längliche oder zur Zeilenrichtung quergestellte ovale Form haben. Besonders vorteilhaft ist ein Verfahren, bei welchem das Mehrfarbenraster des verwendeten Aufzeichnungsträgers nach Anspruch 17 aus bienenwabenförmigen Farbelementen besteht, wodurch Zwischenräume zwischen den Farbelementen vermieden werden und sich eine gute Farbwiedergabe erzielen lässt. Diese Form kann weitgehend der Form eines Ausbrennpunktes entsprechen, die wiederum weitgehend mit der Querschittsform der Ausbrennelektrode übereinstimmt.The individual color elements of the grid can, for example, have a round, elongated or oval shape that is transverse to the line direction. A method is particularly advantageous in which the multicolor grid of the recording medium used consists of honeycomb-shaped color elements, as a result of which gaps between the color elements are avoided and good color reproduction can be achieved. This shape can largely correspond to the shape of a burnout point, which in turn largely corresponds to the cross-sectional shape of the burnout electrode.

Die Grösse der einzelnen Farbelemente wird zweckmässig kleiner als das Auflösungsvermögen des menschlichen Auges gewählt. Bei normalem Betrachtungsabstand von 30 cm bedingt das eine Element- bzw. Punktgrösse von höchstens 0,15 mm Durchmesser bzw. Seitenabstand.The size of the individual color elements is suitably chosen to be smaller than the resolution of the human eye. With a normal viewing distance of 30 cm, this means an element or point size of at most 0.15 mm diameter or side distance.

Eine genaue Positionierung des Schreibkopfes gegenüber dem Aufzeichnugsträger kann erzielt werden, wenn ein mit Markierungen versehener Aufzeichnungsträger verwendet wird, wobei die Markierungen durch am Schreibkopf befestigte bzw. synchron mit diesem bewegte Detektoren erfasst bzw. ausgewertet werden. Die Markierungen können zur Lagekorrektur des Schreibkopfes dienen, die durch Feuchtigkeitsaufnahme bedingte Flächenänderungen des Aufzeichnungsträgers und damit verbundene Relativverschiebungen des Mehrfarbenrasters gegenüber der Schreibelektrode erforderlich sein könnte. Die Markierungen können ferner zur Synchronisierung von Schreibelektrode und Tastkopf im Aufnahmegerät, zum Auslösen von Zählimpulsen, zur Speicher-Auslese, sowie zur Steuerung einer Positioniereinrichtung dienen, die am Beginn einer jeden neuen Zeile die Versetzung der in dieser Zeile liegenden Farbelementegruppen gegenüber jenen der benachbarten Zeilen durch entsprechende Verschiebung des Aufzeichnungsträgers oder der Steuerelektrode ausgleicht.A precise positioning of the write head in relation to the record carrier can be achieved if a record carrier provided with markings is used, the markings being detected or evaluated by detectors attached to the write head or moved synchronously with the latter. The markings can be used to correct the position of the write head, which could be necessary due to changes in the surface area of the record carrier due to moisture absorption and the associated relative displacements of the multicolor screen with respect to the write electrode. The markings can also be used to synchronize the writing electrode and probe in the recording device, to trigger counting pulses, to read out the memory, and to control a positioning device which, at the beginning of each new line, displaces the color element groups in this line from those in the adjacent lines compensated by appropriate displacement of the record carrier or the control electrode.

Besonders vorteilhaft ist es, wenn ein Aufzeichnungsträger verwendet wird, dessen Markierungen gemäss Anspruch 10 als Referenzpunkte ausgebildet sind und innerhalb des Aufzeichnungsfeldes exakt zum Mehrfarbenraster ausgerichtet liegen. In diesem Fall ist der grösstmögliche Abstand der Referenzpunkte zu den Farbelementen einer bestimmten Farbe gleich der Anzahl der vorhandenen Farben multipliziert mit dem Durchmesser bzw. der «Schlüsselweite» der Farbelemente, so dass der durch die unvermeidliche Feuchtdehnung des Papiers bedingte Positionierfehler der Schreibelektrode vernachlässigbar gering gehalten werden kann. Die Refernzpunkte des Aufzeichnungsträgers werden hierbei insbesondere durch speziell behandelte Farbelemente im Mehrfarbenraster des Aufzeichnungsträgers selbst gebildet, so dass sie vom Schreibgerät eindeutig erfasst werden können und andererseits den Bildinhalt nicht beeinträchtigen oder verfälschen. Vorzugsweise sind alle Elemente einer Farbe als Referenzpunkte ausgebildet.It is particularly advantageous if a recording medium is used, the markings of which are designed as reference points and lie precisely aligned with the multicolor grid within the recording field. In this case, the greatest possible distance between the reference points and the color elements of a certain color is equal to the number of colors available multiplied by the diameter or the "key width" of the color elements, so that the positioning error of the writing electrode caused by the inevitable moisture expansion of the paper is kept negligible can be. The reference points of the record carrier are formed here in particular by specially treated color elements in the multicolor grid of the record carrier itself, so that they can be clearly recognized by the writing instrument and on the other hand do not impair or falsify the image content. All elements of one color are preferably designed as reference points.

Die spezielle Behandlung der als Referenzpunkte dienenden Farbelemente des Mehrfarbenrasters kann darin bestehen, dass die Farbe dieser Referenzpunkte zusätzlich zur normalen Pigmentierung mit einem magnetischen Pulver versehen ist.The special treatment of the color elements of the multicolor grid serving as reference points can consist in that the color of these reference points is provided with a magnetic powder in addition to the normal pigmentation.

Eine andere vorteilhafte Möglichkeit zur Heraushebung der Referenzpunkte besteht darin, dass diese einen anderen Glanzwert als die anderen Farbelemente haben, der optisch durch den elektrosensitiven Belag hindurch erkennbar ist.Another advantageous possibility for highlighting the reference points is that they have a different gloss value than the other color elements, which is optically recognizable through the electrosensitive covering.

Zeichnungdrawing

Das erfindungsgemässe Verfahren ist anhand mehrerer Ausführungsbeispiele des erfindungsgemässen Aufzeichnungsträgers und einer Vorrichtung in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen die Figuren 1 und 2 in perspektivischer Explosionsdarstellung Teile von Aufzeichnungsträgern, die sich in Bezug auf ihren grundsätzlichen Aufbau voneinander unterscheiden. In den Figuren 3 bis 6 sind stark vergrössert verschiedene Ausbildungen des Mehrfarbenrasters der Aufzeichnungsträger dargestellt. Fig. 7 zeigt eine Draufsicht auf einen Aufzeichnungsträger mit senkrecht zur Zeilenrichtung verlaufenden Markierungen am Beginn und Ende des Aufzeichnungsfeldes. In Fig. 8 ist schematisch eine Vorrichtung zur Aufzeichnung von mehrfarbigen Bildern nach dem erfindungsgemässen Verfahren dargestellt. Beschreibung der Ausführungsbeispiele und der VorrichtungThe method according to the invention is illustrated in the drawing using several exemplary embodiments of the recording medium according to the invention and a device and is explained in more detail in the description below. Figures 1 and 2 show in perspective exploded view parts of recording media which differ from one another in terms of their basic structure. Various designs of the multicolor grid of the recording media are shown in greatly enlarged form in FIGS. 3 to 6. FIG. 7 shows a top view of a recording medium with markings running perpendicular to the line direction at the beginning and end of the recording field. FIG. 8 schematically shows a device for recording multicolored images using the method according to the invention. Description of the embodiments and the device

Der Aufzeichnungsträger nach Fig. 1 hat einen elektrisch isolierenden Grundkörper 1 und einen Metallfilm 2, der im Vakuum auf den Grundkörper 1 aufgedampft ist. Der Grundkörper 1 besteht aus einem lichtdurchlässigen Kunststoff, der entsprechend des gewünschten Mehrfarbenrasters in der Masse polychrom eingefärbt ist. Dieser Aufzeichnungsträger eignet sich für die Auswertung in Geräten, bei denen der Aufzeichnungsträger von der vom Betrachter abgekehrten Seite her durch eine Lichtquelle angestrahlt wird.1 has an electrically insulating base body 1 and a metal film 2 which is vacuum-deposited onto the base body 1. The base body 1 consists of a translucent plastic, which according to the desired multi-color grid in the Mass is colored polychrome. This record carrier is suitable for evaluation in devices in which the record carrier is illuminated by a light source from the side facing away from the viewer.

Der Aufzeichnungsträger nach Fig. 2 hat einen Grundkörper 3 aus beliebigem, jedoch elektrisch isolierendem Material, z.B. Papier, auf welches eine Lackschicht 4 bzw. Farbschicht zur Bildung des Mehrfarbenrasters aufgetragen bzw. -gedruckt ist. Die Lackschicht 4 ist durch einen aufgedampften Metallfilm 2 nach oben abgedeckt. Dieser Aufzeichnungsträger kann durch direktes Lesen ausgewertet werden.2 has a basic body 3 made of any, but electrically insulating material, e.g. Paper on which a lacquer layer 4 or color layer is applied or printed to form the multicolor screen. The lacquer layer 4 is covered by a vapor-deposited metal film 2. This record carrier can be evaluated by direct reading.

Bei den beiden Aufzeichnungsträgern nach den Figuren 1 und 2 kann das Mehrfarbenraster eine der in den Figuren 3 bis 6 dargestellte Konfiguration haben. Das Mehrfarbenraster nach Fig. 3 besteht aus runden Farbelementen 6, beispielsweise mit den Farben gelb, grün und rot. Zur Unterscheidung der Farben sind in der Zeichnung die gelben Farbelemente weiss, die grünen mit Linienschraffur und die roten mit Kreuzschraffur gekennzeichnet. Die Farbelemente 6 sind in Zeilenrichtung, die durch den Pfeil 7 angedeutet ist, in gleichbleibender, periodisch sich wiederholender Reihenfolge angeordnet, so dass sich hintereinanderliegende Farbelementengruppen 8 bilden, in denen die Elemente gleicher Farben jeweils die gleiche Stellung einnehmen. Die Farbelementengruppen 8 einer Reihe sind versetzt zu den Gruppen 8 der benachbarten Reihe angeordnet, so dass sich eine räumliche Verteilung der gleichfarbigen Elemente des Rasters ergibt. Die Grösse der Farbelemente 6 ist so bemessen, dass jeder möglichen Ausbrennstelle im Metallfilm 2 eine Farbelementengruppe 8 zugeordnet ist.In the two recording media according to FIGS. 1 and 2, the multicolor screen can have one of the configurations shown in FIGS. 3 to 6. 3 consists of round color elements 6, for example with the colors yellow, green and red. To distinguish the colors, the yellow color elements are marked white in the drawing, the green with cross-hatching and the red with cross-hatching. The color elements 6 are arranged in the same direction, which is indicated by the arrow 7, in a constant, periodically repeating order, so that successive color element groups 8 are formed, in which the elements of the same colors each occupy the same position. The color element groups 8 of one row are arranged offset to the groups 8 of the adjacent row, so that there is a spatial distribution of the elements of the grid of the same color. The size of the color elements 6 is dimensioned such that each color point in the metal film 2 is assigned a color element group 8.

Das Mehrfarbenraster nach Fig. 4 besteht aus einzelnen Farbelementen 10, welche eine längliche Form mit in Zeilenrichtung 11 liegender Längsachse haben. Das Raster nach Fig. 5 besteht aus ovalen Farbelementen 12, deren Längsachse quer zur Zeilenrichtung 13 liegt. Die Raster nach den Figuren 4 und 5 sind im übrigen ebenfalls aus Farbelementen dreier unterschiedlicher Farben gebildet, die in jeder Zeile zu sich periodisch wiederholenden Farbelementengruppen 14 bzw. 15 zusammengefasst sind.4 consists of individual color elements 10, which have an elongated shape with a longitudinal axis lying in the line direction 11. 5 consists of oval color elements 12, the longitudinal axis of which is transverse to the line direction 13. The grids according to FIGS. 4 and 5 are also formed from color elements of three different colors, which are grouped into periodically repeating groups of color elements 14 and 15, respectively.

Das Mehrfarbenraster nach Fig. 6 hat bienenwabenförmig angeordnete, sechseckige Farbelemente 16, welche spaltfrei aneinanderstossen, so dass das gesamte Aufzeichnungsfeld mit Farbe bedeckt ist. Die Farbelemente 16 haben abwechselnd die Farben schwarz, gelb, blau und rot, die ebenfalls zu Farbelementengruppen 17 zusammengefasst sind, die sich periodisch wiederholen. Die Farbelementengruppen 17 sind in benachbarten Zeilen so gegeneinander versetzt, dass die Elemente einer Farbe gleichmässig über das gesamte Aufzeichnungsfeld verteilt sind. Die «Schlüsselweite» s eines Farbelementes 16 ist kleiner oder gleich 0,15 mm, so dass das Farbraster vom menschlichen Auge bei normalem Betrachtungsabstand von ca. 30 cm nicht mehr aufgelöst werden kann.6 has hexagonal color elements 16 arranged in a honeycomb shape, which abut one another without a gap, so that the entire recording field is covered with color. The color elements 16 alternately have the colors black, yellow, blue and red, which are also combined into color element groups 17, which are repeated periodically. The color element groups 17 are offset from one another in adjacent lines such that the elements of one color are distributed uniformly over the entire recording field. The “key width” s of a color element 16 is less than or equal to 0.15 mm, so that the color grid can no longer be resolved by the human eye at a normal viewing distance of approximately 30 cm.

In Fig. 6 sind nur die schwarzen Farbelemente 18 des Mehrfarbenrasters durch eine Schraffur gekennzeichnet, während die anderen, sich periodisch wiederholenden Farben im einzelnen nicht gekennzeichnet sind. Die Farbe der schwarzen Farbelemente 18 hat zusätzlich zur normalen Pigmentierung ein magnetisierbares Pulver beigemischt, welches vor dem Beschreiben des Aufzeichnungsträgers magnetisiert worden ist. Die Farbelemente 18 dienen - zusätzlich zur Farbmischung - noch als Referenzpunkte zur induktiven Signalgabe an den Schreibkopf, die zu dessen exakter Positionierung gegenüber dem Mehrfarbenraster und gegebenenfalls auch zum Auslösen von Schreibimpulsen dienen. Weil diese Referenzpunkte unmittelbar im Aufzeichnungsfeld liegen, ist der grösstmögliche Abstand zu einem in der gleichen Zeile liegenden referenzlosen Farbelement gleich viermal «Schlüsselweite» s, also ungefähr 0,6 mm. Bei diesem geringen Abstand beträgt der Positionierungsfehler bei einer Feuchtedehnung des Aufzeichnungsträgers von 1 % = 6 µm, was in Kauf genommen werden kann.In Fig. 6, only the black color elements 18 of the multicolor screen are identified by hatching, while the other, periodically repeating colors are not identified in detail. In addition to the normal pigmentation, the color of the black color elements 18 has added a magnetizable powder which has been magnetized before the recording medium is written on. In addition to the color mixing, the color elements 18 also serve as reference points for inductive signaling to the write head, which are used to position it precisely relative to the multicolor screen and, if appropriate, also to trigger write pulses. Because these reference points are located directly in the recording field, the greatest possible distance to a reference-less color element in the same line is four times the "key width" s, ie approximately 0.6 mm. At this small distance, the positioning error with a moisture expansion of the recording medium of 1% = 6 µm, which can be accepted.

Anstelle der induktiven Übertragung von Refernzsignalen kann auch eine optische Übertragung vorgesehen werden. In diesem Falle können die Referenzpunkte 18 einen anderen Glanzgrad als die anderen Farbelemente des Rasters haben, derart, dass sie auch nach der Metallisierung mit Hilfe einer optischen Abtasteinrichtung, bestehend aus Auflicht-Beleuchtung und lichtempfindlichem Sensor, erkennbar sind. Auch können beide Referenzsysteme gemeinsam eingesetzt werden, z.B. können die magnetischen Referenzpunkte für die Positionierung in x-Achse und die optischen Referenzpunkte für die Positionierung in y-Achse dienen.Instead of the inductive transmission of reference signals, an optical transmission can also be provided. In this case, the reference points 18 can have a different degree of gloss than the other color elements of the grid, in such a way that they can be recognized even after the metallization with the aid of an optical scanning device, consisting of incident light illumination and a light-sensitive sensor. Both reference systems can also be used together, e.g. The magnetic reference points can be used for positioning in the x-axis and the optical reference points for positioning in the y-axis.

In Fig. 7 ist ein Aufzeichnungsträger 20 dargestellt, der an beiden senkrecht zur Schreibrichtung 21 verlaufenden Grenzzonen 22 und 23 seines metallisierten Bereiches 24 mit zusätzlichen Markierungslinien 25 und 26 versehen ist. Der gegenseitige Abstand der Markierungslinien 25 entspricht dem Abstand, welchen die Elemente einer Farbe in einer Zeile des Mehrfarbenrasters untereinander haben.Sie können beispielsweise zur erleichterten Anwahl der Farben zu Beginn der Aufzeichnung, aber auch zu anderen Referenzzwecken dienen. Die Markierungslinien 26 am anderen Ende des metallisierten Bereiches 24 können beispielsweise zur Erfassung und Auswertung der durch Feuchtigkeitsaufnahme bedingten Flächendehnung des Auszeichnungsträgers dienen. Wenn die Markierungslinien ausserhalb des metallisierten Bereiches 24 liegen, können sie auch optisch erfasst werden.FIG. 7 shows a recording medium 20 which is provided with additional marking lines 25 and 26 at both border zones 22 and 23 of its metallized area 24 which run perpendicular to the writing direction 21. The mutual spacing of the marking lines 25 corresponds to the spacing between the elements of a color in a line of the multicolor grid. They can be used, for example, to make it easier to select the colors at the start of the recording, but also for other reference purposes. The marking lines 26 at the other end of the metallized area 24 can be used, for example, for detecting and evaluating the surface expansion of the award carrier caused by moisture absorption. If the marking lines lie outside of the metallized area 24, they can also be detected optically.

Der Aufzeichnungsträger könnte ferner auch an der vom elektrosensitiven Belag abgekehrten Rückseite mit z.B. optisch erkennbaren und auswertbaren Referenzmarken versehen sein.The record carrier could also be on the back facing away from the electrosensitive surface with e.g. optically recognizable and evaluable reference marks.

Die in Fig. 8 dargestellte Vorrichtung zur Durchführung des erfindungsgemässen Verfahrens hat zwei feststehende Auflager 30, 31, über welche ein biegsamer Aufzeichnungsträger 32 mittels einer Transporteinrichtung 33, 34 in Richtung des Pfeiles A hinwegziehbar ist. Am elektrosensitiven Belag des Aufzeichnungsträgers 32 liegt im Bereich des Auflagers 31 eine Schreibelektrode 35 und im Bereich des Auflagers 30 eine grossflächige Gegenelektrode 36 an, welche als mitlaufende Rolle ausgebildet ist. Die Elektroden 35, 36 sind mit einem elektrischen Impulsgenerator 37 verbunden, der nach Massgabe von Schreibsignalen U1 und Phasensignalen u2 die Schreibelektrode 35 und die Antriebsvorrichtung 33, 34 so steuert, dass ein dem abzubildenden Original entsprechendes Raster auf dem Aufzeichnungsträger 32 entsteht. Die Phasensignale U2 haben dabei die Aufgabe, die Schreibelektrode 35 bei jedem Ausbrennimpuls so gegenüber dem Aufzeichnungsträger relativ zu positionieren, dass innerhalb des Mehrfarbenrasters jeweils das gewünschte Farbelement der Farbelementengruppe freigelegt wird.The device shown in FIG. 8 for carrying out the method according to the invention has two fixed supports 30, 31, via which a flexible recording medium 32 by means of a transport device 33, 34 in Rich direction of arrow A can be pulled away. On the electrosensitive coating of the recording medium 32 there is a writing electrode 35 in the area of the support 31 and in the area of the support 30 there is a large counter electrode 36 which is designed as an idling roller. The electrodes 35, 36 are connected to an electrical pulse generator 37, which controls the write electrode 35 and the drive device 33, 34 in accordance with write signals U1 and phase signals u 2 in such a way that a grid corresponding to the original to be reproduced is formed on the recording medium 32. The phase signals U2 have the task of positioning the write electrode 35 relative to the recording medium with each burn-out pulse in such a way that the desired color element of the color element group is exposed within the multicolor screen.

Claims (20)

1. Process for recording coloured information and for reproducing originals such as documents, drawings and pictures on a recording carrier (1, 3, 4, 20) having an electrosensitive covering (2), in particular a metallised paper recording medium, wherein information signals or scanning signals drive an electrical pulse generator (37), to which is connected at least one write electrode (35) which brushes over the electrosensitive covering of the recording carrier and burns out of this covering, in accordance with the signals converted to electropulses, coloured dots which are located below the electrosensitive covering within a multicolour raster which is formed of different colour elements (6) following one another at equal raster spacings, so that by this burning-out the reproduction of the information content or the original is formed, characterised in that for reproduction in different colours the positioning movement of the write electrode (35) toward the next multicolour raster is so controlled that to reproduce the desired colour the corresponding colour element within this raster is selected, or, in the case of mixed colours, the adjacent colour elements required for forming the mixed colour are selected from the colour element group (8) forming the multicolour raster, and is or are exposed.
2. Process according to Claim 1, characterised in that in the case of single-colour reproduction of an information content, a constant raster step, corresponding to the position of the desired colour elements in the multicolour raster, is set at the beginning of the recording or at the beginning of a write line.
3. Process according to Claim 1, characterised in that in the case of multicolour recording, especially in the case of the reproduction of coloured images, phase signals are also derived from the information signals or scanning signals, which phase signals control the positioning movement of the write electrode (35) within a multicolour raster in such a way that the desired colour element or elements (6) is or are selected.
4. Process according to Claims 1 to 3, characterised in that the multicolour raster contains the colours yellow, green and red in periodic sequence.
5. Process according to Claims 1 to 3, characterised in that the multicolour raster contains the colours red, blue, black and yellow or green.
6. Process according to Claims 1 to 3, characterised in that the multicolour raster contains the complementary colours of at least two fundamental colours.
7. Process according to Claims 1 to 6, characterised in that the multicolour raster is formed by appropriate colouring of the base body carrier (1).
8. Process according to Claims 1 to 6, characterised in that the multicolour raster is formed at an intermediate layer (4) located between the base body (3) and the electrosensitive coating (2), in particular on a lacquer layer applied to the base body.
9. Process according to Claims 1 to 6, characterised in that the individual colour elements are applied to the base body by a printing process, especially by a multicolour offset print.
10. Recording carrier for electrosensitive recording processes, in particular a metallised paper recording medium, having a base body(1, 3, 4) of electrically insulating material, an electrosensitive covering (2) located thereon, from which a write electrode (35) can burn out a raster of dots, the reproduction of an information content being generated by the contrast between the zones, exposed at the burning-out points, of a coloured surface extending below the covering ans the surfaces of the covering which have not been burnt away, and the said colour surface being constructed as a multicolour raster formed by different colour elements (6) following one another in equal raster spacings, and markings in the form of reference points for the write electrode, characterised in that these reference points are provided in the recording zone itself and are formed by specially treated colour elements (18) (Fig. 6).
11. Recording carrier according to Claim 10, characterised in that all elements of one colour of the multicolour raster are additionally constructed as reference points (18).
12. Recording carrier according to Claim 10, characterised in that the lacquer of the reference points is provided with a magnetisable pigment additionally to the mormal pigmentation.
13. Recording carrier according to Claims 10, characterised in that the reference points have a different reflectance from the other colour elements, which different reflectance is optically discernible even after the application of the electrosensitive covering.
14. Recording carrier according to Claim 10, characterised in that the individual colour elements (6) of the multicolour raster are of round shape (Fig. 3).
15. Recording carrier according to Claim 10, characterised in that the individual colour elements (10) have a shape which is elongate in the direction of the line (Fig. 4).
16. Recording carrier according to Claim 10, characterised in that the individual colour elements (12) have an oval shape, with the long axis lying transversely to the line direction (Fig. 5).
17. Recording carrier according to Claim 10, characterised in that the individual colour elements (16) are hexagonal and are preferably assembled in a honeycomb manner, i.e. so as to abut mutually on all sides, without leaving a gap (Fig. 6).
18. Recording carrier according to Claim 17, characterised in that the colour elements (16) measure about 0,15 mm from side-face to side-face.
19. Recording carrier according to Claim 10, characterised in that additional edge markings (25, 26) are provided for certain colours, in order to facilitate their selection at the start of the recording (Fig. 7).
20. Recording carrier according to Claim 19, characterised in that the markings (25, 26) are formed by vertical lines at a reserved, preferably non-metallised, edge zone at the start of the recording area, the parallel spacing of the lines corresponding to the repeat periodicity of a selected colour in the multicolour raster.
EP19800106509 1980-10-24 1980-10-24 Method and recording member coated with an electro-sensitive layer recording colored information and reproducing originals Expired EP0050674B1 (en)

Priority Applications (2)

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EP19800106509 EP0050674B1 (en) 1980-10-24 1980-10-24 Method and recording member coated with an electro-sensitive layer recording colored information and reproducing originals
DE8080106509T DE3069983D1 (en) 1980-10-24 1980-10-24 Method and recording member coated with an electro-sensitive layer recording colored information and reproducing originals

Applications Claiming Priority (1)

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EP19800106509 EP0050674B1 (en) 1980-10-24 1980-10-24 Method and recording member coated with an electro-sensitive layer recording colored information and reproducing originals

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EP0050674A1 EP0050674A1 (en) 1982-05-05
EP0050674B1 true EP0050674B1 (en) 1985-01-16

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DE3104390A1 (en) * 1981-02-07 1982-08-19 Robert Bosch Gmbh, 7000 Stuttgart METHOD FOR RECORDING INFORMATION AND REPLAYING ORIGINALS ON A RECORDING CARRIER WITH ELECTROSENSITIVE COATING, AND RECORDING CARRIER FOR IMPLEMENTING THE METHOD

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DE1020261B (en) * 1953-10-06 1957-11-28 Atlas Werke Ag Electrically sensitive paper
DE1054323B (en) * 1957-11-29 1959-04-02 Renker Belipa G M B H Spark registration paper
US3679818A (en) * 1971-04-23 1972-07-25 Bell Telephone Labor Inc Method and medium for producing color images
GB1371683A (en) * 1971-06-13 1974-10-23 Matsushima H Electrosensitive recording medium having a plurality of recording layers
DE2241925A1 (en) * 1972-08-25 1974-04-11 Metrawatt Gmbh METHOD OF MAKING RECORDS
DE2344654B2 (en) * 1973-09-05 1976-05-20 Robert Bosch Gmbh, 7000 Stuttgart REGISTER METAL PAPER AND METHOD FOR MANUFACTURING THE SAME
DE2747485A1 (en) * 1977-10-22 1979-04-26 Bosch Gmbh Robert RECORDING MEDIA FOR REGISTRATION DEVICES

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