WO1992001565A1 - Support d'enregistrement optique effacable pour informations couleur - Google Patents

Support d'enregistrement optique effacable pour informations couleur Download PDF

Info

Publication number
WO1992001565A1
WO1992001565A1 PCT/DE1991/000580 DE9100580W WO9201565A1 WO 1992001565 A1 WO1992001565 A1 WO 1992001565A1 DE 9100580 W DE9100580 W DE 9100580W WO 9201565 A1 WO9201565 A1 WO 9201565A1
Authority
WO
WIPO (PCT)
Prior art keywords
layer
recording medium
punctiform
temperature
optical recording
Prior art date
Application number
PCT/DE1991/000580
Other languages
German (de)
English (en)
Inventor
Klaus M. Moses
Original Assignee
Telenorma Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Telenorma Gmbh filed Critical Telenorma Gmbh
Publication of WO1992001565A1 publication Critical patent/WO1992001565A1/fr

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/0147—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on thermo-optic effects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B41M5/30—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using chemical colour formers
    • B41M5/305—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using chemical colour formers with reversible electron-donor electron-acceptor compositions

Definitions

  • the invention relates to an erasable optical recording medium consisting of a carrier and a heat-sensitive layer attached thereon with optical states which can be influenced by different temperatures (for example opaque and transparent), the states in the normal ambient temperature (for example room temperature) permanently and by heating are reversible to certain temperatures.
  • EP-PS 0 000 868 and 0 014 826 for example, a body with reversible fixed and temperature-changeable is - 2 -
  • Light extinctions are described, which is designed as an erasable record carrier consisting of a pair of substances which, for example, when heated from the state of maximum light extinction to a clear temperature below a conversion temperature and subsequent cooling and below a lower temperature value, a decreasing light extinction with increasing heating temperature having.
  • the recording and erasing process can be repeated as desired, it being possible for the recording to be carried out by means of finely concentrated heat or light radiation or else by means of contact heat.
  • the known recording medium is thus suitable for the erasable recording of numbers, letters, images, patterns, etc., and the recordings can be made both transparently in an opaque environment and opaque in a transparent environment.
  • the object of the invention is to develop the known recording medium in such a way that it is also suitable for recording colored information.
  • This object is achieved in that an atrix-shaped grid of colored, punctiform or correspondingly shaped surfaces is attached to the support on the side facing the layer.
  • the colored recording is done by heating the overlying heat-sensitive layer in the area of the respective area with the desired color in such a way that it assumes the transparent state, while the remaining area of the layer remains in the opaque state in which it was before the start of the Recording process has been brought uniformly.
  • a further development of the invention consists in that three point-shaped surfaces are combined to form an area, each of the point-shaped surfaces having a different basic color
  • a further development of the invention also consists in the fact that four point-shaped surfaces are combined to form an area, each of the point-shaped ones
  • 15 punctiform surface depends on the intended use.
  • the size of such an area is smaller than, for example, the impact area of one
  • the individual areas can assume orders of magnitude of one or more mm 2 .
  • the object stated at the outset is achieved in that the support is colored black on the side facing the layer, and on the side of the layer facing away from the support a matrix-shaped grid of colored, punctiform or correspondingly shaped surfaces is attached, and that a second heat-sensitive layer is applied on the first layer, the temperatures for changing the optical properties of the two layers being different.
  • the first layer lying under the punctiform surfaces is only converted from the opaque to the transparent state if black is required as the fourth or fifth color.
  • FIG. 6 shows the graphical representation of the two states of the two layers of the recording medium according to FIG. 3 as a function of different temperatures.
  • 1 shows the state transitions as a function of temperature for a possible thermosensitive layer. From the diagram it is clear that starting remains until the temperature TO and the transparent state to • for Temepratur T2 obtained from a first temperature (ambient temperature) of the non-transparent state (opaque) of the material, TO at about 35 degrees C and T2 in is about +73 degrees C.
  • the material can be in opaque condition and ambient temperature. . . in the area between TO and Tl are continuously switched to a state of maximum transparency. Starting from the transparent state and ambient temperature, the changeover to the opaque state occurs suddenly at temperature T2.
  • the temperature Tl is around 64 degrees C. This characteristic also enables the generation of any levels between opaque and transparent by appropriate metering of the writing energy.
  • the record carrier In the environment, the record carrier must first be converted to the opaque state. This is done by an erasing process in which the thermosensitive layer is first heated to at least the temperature T2 and then cooled to TO or less than TO.
  • the layer is then heated to a temperature between T1 and T2, which is, for example, between +64 and +73 degrees C, the layer becomes transparent and maintains this state even after cooling to the ambient temperature.
  • the carrier material T can either be made of paper or an opaque plastic or also of a transparent one Material.
  • such constructed record carrier may for reproducing far ⁇ biger information, for example, in common Pa ⁇ pierformaten or also serve as a display device which is illuminated by the daylight, while the recording medium is composed • suitable from a transparent carrier material especially for display devices, which can be illuminated .
  • the light source sits on the side of the carrier T facing away from the layer S.
  • the areas B are applied to the side X of the carrier T facing the layer S, for example by a printing or also a screen printing process.
  • this consists of three point-shaped or appropriately shaped surfaces F with the colors blue (b), red (r) and yellow (g).
  • the surfaces F are arranged in an atrix shape, namely in columns S1 to Sn and rows Z.
  • FIG. 5 shows the structure of an area B consisting of four point-shaped surfaces F, which are the primary colors red (r), yellow (g), blue (b) and black
  • the recording process for information now consists in the layer S (see FIG. 2 or 3) being transferred from the opaque to the transparent state in the region which is above a punctiform surface F by appropriate heating.
  • the punctiform colored surface F located under the layer s is thus visible.
  • Depending on desired color can now be made visible within a region B either only one colored area F or several colored areas F in the manner described.
  • the arrangement of four colored areas F within a region B has the advantage that the control of the means heating the layer S (see FIG. 2 or 3) at the relevant points is easier than with an arrangement of the areas F according to FIG Fig. 4.
  • area B forms the smallest image unit from which the image is composed. This means that, for example in the case of a dot matrix printer, the area B corresponds to the area which can be marked by the individual needle. Depending on the desired resolution, this can mean that the areas F must have very small dimensions.
  • the requirements for the resolving power may not be so great, so that the punctiform areas F can also assume larger dimensions, for example in the order of magnitude of a few mm 2 .
  • Basic color black can be omitted.
  • the recording medium in accordance with FIG. 3 can be constructed accordingly.
  • a first heat-sensitive layer S1 is attached to an opaque carrier T on the side X facing the layer S, a black layer in the region X being provided between the carrier T and the first heat-sensitive layer S1.
  • the areas B are applied, which are covered by a second heat-sensitive layer S2.
  • the basic colors of a region B are reproduced in that the desired ones
  • the second layer S2 is brought into the transparent state in order to make the color in question visible.
  • the second layer S2 is brought into the transparent state in order to make the color in question visible.
  • the first layer S1 at the relevant points is also heated by heating from the opaque to the transparent state, as a result of which the black color on the carrier T becomes visible 5.
  • the layer S above the desired area F is converted into the transparent state within a region B, ie that the coloring information of region B is reproduced exactly 5.
  • the heating means for example a bundled light beam or the resistance element
  • the recording medium T is therefore provided, for example, on its side facing away from the layer S with corresponding markings which correspond, for example, to the rows Z and columns S.
  • the exact positioning of the action of heat on the layer S can be controlled by means of corresponding optical scanning devices which act on the back of the recording medium T, ie on the side of the medium T facing away from the layer S.
  • markings can also be applied on the side of the layer S or S2 facing away from the carrier T, specifically such that they are not visible, for example, when illuminated with normal light, for example colors fluorescent under UV light.
  • the columns S are in the direction of movement of the recording medium or the writing device, they can be marked, for example, as solid lines.
  • the column of each punctiform surface F does not necessarily have to be marked, but for example every fifth.
  • the line markings can either be attached to the edge of the recording medium, although it is also not absolutely necessary to mark each line of the punctiform surfaces F.
  • the column marking is detected by a suitable sensor device and the recording medium transversely to the direction of movement by suitable means positioned such that the writing device, not shown, is located in an area B.
  • FIG. 6 An exemplary temperature behavior of the two heat-sensitive layers of the recording medium according to FIG. 3 is shown in FIG. 6. If both layers S1 and S2 are in the opaque state at room temperature TO, layer S2 begins to become more translucent in the area of temperature T3 due to the increasing heating of the recording medium, while layer S1 initially still fully retains the opaque state. As soon as the temperature T1 is reached, the layer S2 changes to the transparent state, while the layer S1 still remains almost in the opaque state. If the temperature is not increased above T1, but the recording medium is cooled again to the room temperature TO, the transparent state of the layer S2 and the opaque state of the layer S1 are retained, as a result of which only the colored areas B which are visible through the layer S1 in the opaque state is highlighted in white.
  • the layer S1 lying below the layer S2 also changes to the transparent state. If the temperature is not raised further above T2, but the recording medium is cooled again to the room temperature TO, the transparent state is maintained in both layers S1 and S2.
  • the white background of the colored areas is no longer available, i. H. the colors, which are transparent in themselves, appear against a black background and are therefore perceived by the eye as black.
  • the recording medium To delete the information applied, ie converting the layer S1 or the layer S2 into the opaque state, the recording medium must be heated to at least the temperature T4, which is above the temperature T2. After subsequent cooling to room temperature TO, both layers S1 and S2 maintain the opaque state.
  • the temperature at which both layers S1 and S2 are converted into the opaque state can be the same for both layers.
  • the temperature behavior of the layers S1 and S2 shown in FIG. 6 is only exemplary and can also be selected in a different form, it is only necessary to ensure that the transition temperature from the opaque to the transparent state for the layer S2 must be lower than that of the Layer S1 and the transition temperature from the transparent state to the opaque state of layer S2 must be above the transition temperature from the opaque to the transparent state of layer S1. In any case, it must be ensured that the layer S1 can be converted from the opaque to the transparent state without changing the transparent state of the layer S2 into the opaque state. It is assumed that the recording of information takes place in that the layers S 1 or S 2 which are in the opaque state are located at those points which are above the punctiform surfaces F (see FIG. 4 or 5) As part of the recording process in the transparent state.
  • Recording medium with a heat-sensitive layer is used, is extensively discussed in PCT / DE90 / 00484, i. H. also that the recording medium according to the invention can be provided with information with the aid of the recording device described there and can be used in accordance with the display device explained there.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Heat Sensitive Colour Forming Recording (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)
  • Credit Cards Or The Like (AREA)

Abstract

Un support d'enregistrement optique effaçable pour informations couleur composé d'un support sur lequel est appliquée une couche thermosensible ayant des états optiques influençables par des températures variables (p.ex. opaque et transparent), les états étant permanents à la température ambiante normale (p.ex. température de chambre) et réversibles par échauffement à certaines températures, est conçu de telle sorte que chaque fois quatre surfaces ponctuelles (F) sont réunies en une zone (B), chacune des surfaces ponctuelles (F) présentant une couleur primaire différente (par exemple rouge-jaune-bleu-noir). Lorsque l'on rend transparente par échauffement sélectif la couche thermosensible au-dessus d'une surface ponctuelle (F) d'une zone (B), la surface ponctuelle colorée située sous la couche devient visible. De cette manière est possible l'enregistrement d'informations couleur, et ceci soit dans le cadre de l'inscription sur un support d'enregistrement en forme de feuille de papier, soit dans le cadre d'un processus d'enregistrement sur un support d'enregistrement conçu comme bande sans fin d'un dispositif d'affichage.
PCT/DE1991/000580 1990-07-19 1991-07-12 Support d'enregistrement optique effacable pour informations couleur WO1992001565A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP4022974.2 1990-07-19
DE19904022974 DE4022974A1 (de) 1990-07-19 1990-07-19 Loeschbarer optischer aufzeichnungstraeger fuer farbige informationen

Publications (1)

Publication Number Publication Date
WO1992001565A1 true WO1992001565A1 (fr) 1992-02-06

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Application Number Title Priority Date Filing Date
PCT/DE1991/000580 WO1992001565A1 (fr) 1990-07-19 1991-07-12 Support d'enregistrement optique effacable pour informations couleur

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WO (1) WO1992001565A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998022928A1 (fr) * 1996-11-18 1998-05-28 Array Printers Ab Dispositif et procede d'affichage pour visualiser des informations d'images generees par ordinateur
US5818480A (en) * 1995-02-14 1998-10-06 Array Printers Ab Method and apparatus to control electrodes in a print unit
US5847733A (en) * 1996-03-22 1998-12-08 Array Printers Ab Publ. Apparatus and method for increasing the coverage area of a control electrode during direct electrostatic printing
US5889542A (en) * 1996-11-27 1999-03-30 Array Printers Publ. Ab Printhead structure for direct electrostatic printing
US5956064A (en) * 1996-10-16 1999-09-21 Array Printers Publ. Ab Device for enhancing transport of proper polarity toner in direct electrostatic printing
US5959648A (en) * 1996-11-27 1999-09-28 Array Printers Ab Device and a method for positioning an array of control electrodes in a printhead structure for direct electrostatic printing
US6229514B1 (en) 1995-11-13 2001-05-08 Array Printers Publ. Ab Display device and method for visualizing computer generated image information
US6278430B1 (en) 1998-03-06 2001-08-21 Array Printers Ab Thermosensitive display device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4395718A (en) * 1980-09-18 1983-07-26 Fuji Xerox Co., Ltd. Thermal transfer recording medium
US4554565A (en) * 1984-04-06 1985-11-19 Pilot Ink Co., Ltd. Method of producing reversible thermochromic display
US4755831A (en) * 1985-06-28 1988-07-05 Ricoh Company, Ltd. Multi-layer full-color thermosensitive sheet recording method
US4837071A (en) * 1986-11-25 1989-06-06 Ricoh Company, Ltd. Information display medium

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4395718A (en) * 1980-09-18 1983-07-26 Fuji Xerox Co., Ltd. Thermal transfer recording medium
US4554565A (en) * 1984-04-06 1985-11-19 Pilot Ink Co., Ltd. Method of producing reversible thermochromic display
US4755831A (en) * 1985-06-28 1988-07-05 Ricoh Company, Ltd. Multi-layer full-color thermosensitive sheet recording method
US4837071A (en) * 1986-11-25 1989-06-06 Ricoh Company, Ltd. Information display medium

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5818480A (en) * 1995-02-14 1998-10-06 Array Printers Ab Method and apparatus to control electrodes in a print unit
US6229514B1 (en) 1995-11-13 2001-05-08 Array Printers Publ. Ab Display device and method for visualizing computer generated image information
US5847733A (en) * 1996-03-22 1998-12-08 Array Printers Ab Publ. Apparatus and method for increasing the coverage area of a control electrode during direct electrostatic printing
US5956064A (en) * 1996-10-16 1999-09-21 Array Printers Publ. Ab Device for enhancing transport of proper polarity toner in direct electrostatic printing
WO1998022928A1 (fr) * 1996-11-18 1998-05-28 Array Printers Ab Dispositif et procede d'affichage pour visualiser des informations d'images generees par ordinateur
US5854614A (en) * 1996-11-18 1998-12-29 Array Printers Ab Publ. Display device and method for visualizing computer generated image information
US5889542A (en) * 1996-11-27 1999-03-30 Array Printers Publ. Ab Printhead structure for direct electrostatic printing
US5959648A (en) * 1996-11-27 1999-09-28 Array Printers Ab Device and a method for positioning an array of control electrodes in a printhead structure for direct electrostatic printing
US6278430B1 (en) 1998-03-06 2001-08-21 Array Printers Ab Thermosensitive display device

Also Published As

Publication number Publication date
DE4022974A1 (de) 1992-01-23

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