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EP4023448B1 - Procédé de génération des données de commande destiné à l'impression directe thermique multicolore - Google Patents

Procédé de génération des données de commande destiné à l'impression directe thermique multicolore Download PDF

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Publication number
EP4023448B1
EP4023448B1 EP20218029.5A EP20218029A EP4023448B1 EP 4023448 B1 EP4023448 B1 EP 4023448B1 EP 20218029 A EP20218029 A EP 20218029A EP 4023448 B1 EP4023448 B1 EP 4023448B1
Authority
EP
European Patent Office
Prior art keywords
printing
colour
direct thermal
temperature
paper
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.)
Active
Application number
EP20218029.5A
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German (de)
English (en)
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EP4023448A1 (fr
Inventor
Jannasch Uwe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bizerba SE and Co KG
Original Assignee
Bizerba SE and Co KG
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 Bizerba SE and Co KG filed Critical Bizerba SE and Co KG
Priority to EP20218029.5A priority Critical patent/EP4023448B1/fr
Priority to US17/557,155 priority patent/US12128692B2/en
Publication of EP4023448A1 publication Critical patent/EP4023448A1/fr
Application granted granted Critical
Publication of EP4023448B1 publication Critical patent/EP4023448B1/fr
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/315Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material
    • B41J2/32Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads
    • B41J2/35Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads providing current or voltage to the thermal head
    • B41J2/355Control circuits for heating-element selection
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/315Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material
    • B41J2/32Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/315Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material
    • B41J2/32Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads
    • B41J2/325Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads by selective transfer of ink from ink carrier, e.g. from ink ribbon or sheet
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J3/00Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
    • B41J3/60Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed for printing on both faces of the printing material

Definitions

  • the present invention relates to a method for creating control data for multi-colour, in particular two-colour, direct thermal printing.
  • Direct thermal printing papers that change color in response to different temperatures are known to those skilled in the art.
  • the direct thermal printing paper KLRB 46B from Kanzan is a paper that turns red at a temperature of 75° C to 80° C and black at a temperature of 95° C to 105° C.
  • the EP1866161B1 also shows a two-colour thermal direct printing paper.
  • the EP1866161B1 further shows a printer for printing on such a thermal direct printing paper, which comprises two print heads, wherein the first print head applies a temperature to the thermal direct printing paper that triggers a discoloration in the first color and the second print head applies a temperature to the thermal direct printing paper that triggers a discoloration in the second color.
  • a thermal direct printing paper on which three-color printing is possible.
  • EP1910086B1 discloses a multi-color direct thermal printer in which different heating elements on a thermal print head can print on different color-forming layers of a multi-color thermal imaging element in a single pass.
  • the line printing time is divided into portions, each of which is divided into several sub-intervals. All pulses within the portions have the same energy. By varying the proportion of the sub-intervals that contain pulses, different colors are selected for printing in the different portions. This
  • the object of the invention is to enable more cost-effective multi-coloured direct thermal printing.
  • the thermal direct printing paper is continuously fed past the print head and printed one line after the other.
  • the control data for the print lines is therefore control data that is sent to the print head one after the other and the heat sources are accordingly repeatedly controlled at intervals and heated to the printing temperature or not heated at all.
  • control data causes a plurality of adjacent heat sources to be heated to the printing temperature at the locations where the second color is to be formed on the direct thermal printing paper.
  • control data from a plurality of adjacent heat sources causes a portion of the heat sources to be heated to the printing temperature and the other portion of the heat sources not to be heated.
  • Adjacent heat sources in the row direction are heat sources that are arranged next to each other on the print head.
  • Adjacent heat sources in the column direction are always the same heat source in the print head, but it is controlled line by line and thus one after the other. Even if from a hardware perspective it is only a single If it is a heat source, the line-by-line feed and printing of the direct thermal printing paper means that the heat source is directed sequentially at print pixels arranged next to one another in the column direction.
  • the original image is entered via the input/output device and includes, for example, text in black font and text in red font, it is already clear from the input which areas, namely the areas covered by the text, are present in which color in the image data. If the original image is, for example, a graphic that was received electronically via the receiving device, an image recognition algorithm must be applied to identify the areas in the first color and the areas in the second color.
  • the regular grid is a grid that repeats row by row and/or column by column or is arranged obliquely.
  • areas of the first color in the image data are mapped in different regular grids in the control pattern based on their brightness.
  • Dark areas in the first color in the control pattern include more active print pixels than light areas in the first color. This is the case when the second color is black. With more active print pixels, there is a higher proportion of black pixels in the direct thermal print and the area of the first color appears darker to the human eye.
  • At least parts of the active print pixels have a minimum distance in areas that exceed a certain brightness.
  • the minimum distance is selected so that the first color, the second color and the paper color overlap on the thermal direct printing paper.
  • the print pixels are arranged so far apart that an unprinted area, and thus an area in the paper color, in particular a white area, remains between two areas printed by the print pixels on the thermal direct paper.
  • the control pattern for brightening an area in the second color includes a plurality of print pixels arranged in a regular grid, in particular a plurality of groups of adjacent print pixels arranged in a regular grid. All other print pixels in the area are active print pixels.
  • An area of the second color only includes active print pixels. By inserting groups of inactive print pixels in a regular grid, white areas are created that brighten the second color. However, the white areas are surrounded by a narrow border of the first color. If the second color is black and the first color is red, grayscale printing is possible with such a control pattern, whereby the grayscale print will have a slight red shimmer.
  • the input/output device comprises a display on which a graphical user interface is shown.
  • the input/output device is designed to receive inputs for creating a label layout, the inputs comprising characters, standard graphics, colors, sizes, alignments and/or positions.
  • the control device is designed to display the print image resulting from the created control data on the input/output device. In one embodiment, the control device is designed to compare the print image resulting from the created control data on the input/output device with the original image.
  • control device comprises an object recognition device that recognizes at least one barcode in the image data from an original image received via the input/output device or receiving device.
  • the control device outputs an error message via the input/output device if the barcode does not have the second color and/or is not aligned in a printing direction.
  • a barcode is particularly easy to read when it is printed in black and when the barcode stripes are printed along the printing direction.
  • the two-colour thermal direct printing paper in particular the paper from Kanzan mentioned above, turns red when heat is applied in a first temperature range of 75° C to 80° C and black at a temperature of 95° C to 105° C. Since the paper slides along under the print head and the heat sources are covered with a protective layer or glass, for example, and the paper as linerless paper has a protective layer, in particular a silicone layer, over the thermo-reactive layer, the heat sources during printing may have to have slightly higher temperatures than the discolouration temperatures mentioned above.
  • the thermal direct printing paper is designed to supply two discrete temperatures for two-colour printing. However, thermal direct print heads whose heat sources can generate two different temperatures are technically complex and sometimes unreliable.
  • the process has the advantage that only one discrete temperature, the printing temperature, has to be generated at the heat sources. If several adjacent pixels are heated to the printing temperature, the printing temperature and the Thermal direct printing paper under these pixels heats up to the higher temperature range in which the second color is formed. If some of a group of adjacent heat sources, i.e. a group of pixels next to each other, are heated to the printing temperature and others are not, an average temperature is formed that is transferred to the thermal direct printing paper, which falls into the lower temperature range of the thermal direct printing paper and forms the first color. It can be observed that the active heat sources, i.e. those heated to the printing temperature, form pixels in the second color on the thermal direct printing paper.
  • spots in the first color form because the temperature on the thermal direct printing paper drops slightly in these areas and corresponds to the lower temperature range.
  • the process takes advantage of the effect that a point heat source has heat radiation in the immediate area.
  • a combination of active and inactive heat sources creates a pixel pattern on the thermal direct printing paper that has a few pixels in the second color and pixels in the first color around them.
  • the human eye does not perceive the individual pixels. Rather, the area appears like a surface in the first color, depending on the ratio between active and inactive heat sources and their geometric arrangement.
  • the unprinted thermal direct printing paper is usually white or has a whitish color. This is not to be understood as a first or second color within the meaning of the invention.
  • the second color is black.
  • the first color is red.
  • the first color and the second color refer to a reaction of the thermo-reactive layer. At the pixel where heat is applied, the thermo-reactive layer.
  • the thermo-reactive layer By combining different pixels of the first color with the second color and with the light, in particular white, color of the unprinted paper, color effects can be achieved, such as a light red area or a dark red area.
  • these consist of individual red, white and black pixels and are not to be regarded as separate colors within the meaning of this disclosure.
  • the printing temperature is equal to or higher than the second temperature.
  • the heat source must transfer heat to the paper at the temperature of the higher temperature range. This is the second temperature. Due to the effects that can occur due to the protective layer on the print head and the protective layer on the direct thermal printing paper, the printing temperature may need to be slightly higher than the second temperature.
  • the step of moving the direct thermal printing paper line by line occurs during a line time from a line n to a next line n+1.
  • the movement of the direct thermal printing paper occurs continuously, i.e. the paper is moved past the print head at a constant or nearly constant speed.
  • the movement of the direct thermal printing paper occurs stepwise, i.e. the direct thermal printing paper is moved to the next line n+1 and stopped until the line time has elapsed and then moved on to line n+2.
  • the area on the thermal direct printing paper when printing an area, comprises several rows and several columns. From the perspective of the print head, the rows correspond to a time at which this row is located under the heat sources of the print head. From the perspective of the print head, the columns of the area correspond to certain heat sources of the print head. If an area on the thermal direct printing paper is printed in the second color, all of the Heat sources corresponding to the columns of the rows are heated to the printing temperature. Thus, all heat sources corresponding to the projection onto the area on the direct thermal printing paper are heated to the printing temperature and the area turns the second color.
  • the area is printed in the first color, a portion of the heat sources mentioned in the previous section must be heated to the printing temperature (active heat sources) and another portion is not heated (inactive heat sources), i.e. the other portion of the heat sources is not electrically controlled.
  • active heat sources the printing temperature
  • inactive heat sources the other portion of the heat sources is not electrically controlled.
  • a portion of the heat sources corresponding to the several columns are heated to the printing temperature during the printing of the several rows (n, n+1, n+2), so that the projection of the heat sources onto the area corresponds to a regular grid of active and inactive heat sources, where there are the same number or more inactive heat sources than active ones.
  • a pure print in the first color i.e. an area that only has pixels in the first color
  • the human eye perceives the surface in the first color if the pixels of the first color and the pixels of the second color are arranged in a regular grid and the pixels of the first color predominate. Therefore, there must be as many or more inactive heat sources in the grid on the projection of the surface as active heat sources.
  • the heat sources corresponding to the several columns are heated to the printing temperature during the printing of the several rows (n, n+1, n+2) in such a way that the projection of the heat sources onto the area corresponds to a regular grid of active and inactive heat sources.
  • the paper color is white, whereby the white can have a slight reddish tinge.
  • the grid is arranged in such a way that the distance between two heat sources that are heated to the printing temperature exceeds a minimum distance in the row direction and column direction, a white pixel appears on the area.
  • a grid that represents an overlay of pixels in the first color, in the second color and of white pixels.
  • the second color is black. Shades of the first color, especially red, can be printed in different brightness levels.
  • a screen that includes more active heat sources results in a darker shade of the first color being printed on the direct thermal printing paper than a screen with fewer active heat sources.
  • the first color is red and the second color is black
  • an appropriate selection of the screen with white and black pixels can produce shades of red in different brightnesses, from a bright red with a large white component to a dark red that fades into black.
  • the fact that the printing of red pixels through the printing process always results in a black pixel in the middle that is surrounded by red pixels means that there cannot be a pure red area and that an area perceived by the human eye as a red area consists of a plurality of red pixels and a smaller number of black pixels and, in particular, a smaller number of white pixels.
  • the regular grid is a grid that repeats row by row and/or column by column or is arranged diagonally or alternately. Different effects can be achieved with different regular grids and, in particular, different brightnesses of the first color can be printed.
  • a repeating grid over several pixels in the row direction and in the column direction results in a small area in a certain brightness of the first color.
  • Various geometric shapes can be put together from many small areas, resulting in many shapes and a large degree of freedom for prints in the first and second colors.
  • the thermal direct printing paper is linerless paper.
  • the thermal direct printing paper comprises a silicone layer on the top side.
  • Linerless paper is paper made from a continuous strip that does not comprise a carrier tape.
  • the back paper layer has an adhesive material, in particular an adhesive coating, in order to be able to stick labels separated from the continuous strip onto an object.
  • the top of the paper is provided with a silicone layer from which the adhesive material can be removed.
  • This silicone layer on the thermal direct printing paper has the advantage during printing that the heat from the heat source is distributed somewhat in the silicone layer and penetrates not only into the paper at certain points under the heat source, but also into its surroundings.
  • an active heat source is electrically controlled by the control device during a printing interval.
  • the printing interval is divided into a saturation interval and a subsequent cooling interval.
  • the saturation interval begins with a waiting time.
  • the heat source is only supplied with power during the time after the waiting time has elapsed until the end of the saturation interval.
  • the waiting time in line n depends on the status of the heat source in at least one previous line n-1.
  • the printing interval corresponds to the line time.
  • the saturation interval is the same for all heat sources of the print head.
  • the waiting time can be selected differently for each heat source and depends on the previous state of this heat source. If, for example, a heat source is heated to the printing temperature in a previous line n-1, it still has a certain amount of residual heat in the following line. If this heat source is to be heated up to the printing temperature again in this line, slightly less power is required than with a cold heat source due to the residual heat.
  • the print head has a temperature sensor on its surface.
  • the saturation interval which is the same for all heat sources, is determined depending on the temperature of the temperature sensor. For example, a longer saturation interval is selected in a very cold environment than in a warm environment.
  • a computer program with program code means is proposed to implement the method for creating control data for operating a direct thermal printer for To perform printing on direct thermal paper when the program is run on a computer or on a computer of a direct thermal printer.
  • a computer program product with program code means stored on a computer-readable data carrier is proposed for carrying out the method for creating control data for operating a direct thermal printer for printing on direct thermal printing paper when the computer program is executed on a computer or on a computer of a direct thermal printer.
  • a data processing device with an input/output device, a control device, in particular a CPU, and a transmitting/receiving device for transmitting and receiving data via a network.
  • the control device carries out a method for creating control data for operating a direct thermal printer for printing on direct thermal printing paper.
  • the transmitting/receiving device is designed to send the control data and/or the control patterns to a direct thermal printer via the network.
  • a thermal direct printer for printing on thermal direct printing paper.
  • the thermal direct printing paper comprises at least one thermo-reactive layer. At least two colors can be formed with the at least one thermo-reactive layer. When a first temperature is applied, a first color is formed and when a second temperature is applied, a second color is formed. The second temperature is higher than the first temperature.
  • the thermal direct printer comprises a transport roller that moves the thermal direct printing paper along a paper path from a paper pickup to a paper output.
  • the thermal direct printer comprises a print head that comprises electrically controllable heat sources arranged next to one another transversely to the paper path. The print head supplies heat to the thermal direct printing paper at specific points.
  • the thermal direct printer comprises a control device that controls rotation of the transport roller and uses the transport roller to move the thermal direct printing paper line by line along the print head in a printing direction.
  • Each heat source of the print head is electrically connected to the control device and can be heated to a printing temperature.
  • the control device carries out a method for creating control data for operating a thermal direct printer for printing on thermal direct printing paper.
  • the control device controls the heat sources with the control data.
  • control device is designed to heat selected heat sources of the print head to the printing temperature in each line of the direct thermal printing paper. At the locations where the second color is to be formed on the direct thermal printing paper, several adjacent heat sources are heated to the printing temperature. At the locations where the first color is to be formed on the direct thermal printing paper, a portion of several adjacent heat sources is heated to the printing temperature and the other portion of the heat sources is not heated.
  • the print bar is a print bar based on thick film technology.
  • Examples of print bars based on thick film technology are the KD2004-DC91B from Rohm or the KPW-104-BZR from Kyocera.
  • the print bar is a print bar based on thin film technology.
  • the printing temperature is equal to or higher than the second temperature.
  • the transport roller is a pressure roller that presses the direct thermal printing paper against the print head.
  • the direct thermal printer is a linerless printer and the direct thermal printing paper is a continuous paper made of linerless paper with a silicone layer on its top.
  • control device controls the transport roller so that the transport roller moves the direct thermal printing paper from a line n to a next line n+1 during a line time, wherein the movement occurs stepwise or continuously during the line time.
  • Fig.1 shows a thermal direct printer 30 in a schematic representation.
  • the printer comprises a paper path that leads from a paper holder 46, in which a paper roll 32 is stored, via a printing roller 40 and a print head 42 to a paper output 44.
  • the paper is wound onto a paper roll 32 in the form of a continuous strip of thermal direct printing paper 34.
  • the thermal direct printing paper 34 comprises a bottom side to which an adhesive layer is applied and a top side 36 to which a silicone layer is applied.
  • the printing roller 40 serves as a transport roller for the continuous strip of thermal direct printing paper 34.
  • the printing roller presses the thermal direct printing paper 34 with its top side 36 against the print head 42.
  • the thermal direct printer 30 comprises a control device 48 that is electrically connected to the print head 42 and the printing roller 40.
  • the control device 48 controls the printing roller 40, which moves the direct thermal printing paper 34 line by line past the print head 42.
  • the control device 48 also controls the print head 42, in particular the control device 48 controls the heat sources 52 of the print head 42, so that the desired print is produced in line n, which is located directly under the print head 42 as a result of the transport of the direct thermal printing paper 34.
  • the coordinated control of the printing roller 40 and the print head 42 by the control device 48 results in line-by-line printing on the direct thermal printing paper 34.
  • the pixels in the column direction correspond to the individual heat sources 52, and the pixels in the row direction n, n+1, n+2 correspond to the respective time t0, tz, 2tz at which the corresponding line n, n+1, n+2 is located under the print head 42.
  • the controller 48 is configured to heat or not heat each individual heat source 52 to a printing temperature.
  • the control device 48 is further connected to a transmitting/receiving device 49.
  • the transmitting/receiving device 49, the direct thermal printer 30 is connected via a network to a transmitting/receiving device 76 of a data processing device 70.
  • the data processing device 70 comprises an input/output device 72 with which an operator can operate the data processing device 70. The operator can enter image data of an original image that is to be printed via the direct thermal printer 30 into the data processing device 70 via the input/output device 72.
  • the data processing device 70 comprises a control device 74 that is designed to create control data.
  • the control data is data for controlling the direct thermal printer 30.
  • the control data is sent from the data processing device 70 to the direct thermal printer via the transmitting/receiving device 76.
  • the data processing device 70 is integrated into the direct thermal printer 30.
  • Fig.2 shows a print head 42 in a view from below.
  • the thermal direct paper 34 is moved along a printing direction 60 by the printing roller 40 past the print head 42 line by line.
  • the print head 42 comprises a printing field 56 with a plurality of heat sources 52 arranged next to one another.
  • the heat sources emit heat at specific points.
  • the distance 54 between the heat sources 52 is shown in Fig.2 relatively wide. In practice, the distance 54 between two adjacent heat sources 52 is very narrow. It should be Fig.2 It should only be indicated that each heat source 52 is installed independently of the adjacent heat sources 52 and can be controlled separately by the control device.
  • the width of the printing field 56 corresponds at least to the maximum printable paper width.
  • the printing field 56 is covered with a preferably good heat-conducting cover in order to protect the heat sources 52 from mechanical damage.
  • the heat sources 52 are in particular heating resistors.
  • the print head 42 comprises a temperature sensor 58 which measures the temperature 58 on the top of the print head and passes it on as a parameter to the control device 48.
  • thermal direct paper width 60 mm, 80 mm or 120 mm.
  • a typical resolution of the applicant's linerless thermal direct printing paper is 200 dpi, in particular 300 dpi.
  • a typical printing speed i.e. a typical transport speed at which the paper is moved under the print head, is 100 mm/s to 400 mm/s, in particular 120 mm/s, 150 mm/s or 250 mm/s.
  • the print head contains at least 960 heat sources 52.
  • the printing roller At a resolution of 300 dpi, 12 dots/mm, i.e. 12 lines/mm in the transport direction are necessary. At a typical transport speed, i.e. printing speed, of 150 mm/s, the printing roller must make 1800 lines/s, i.e. 1800 steps per second.
  • Fig.3 shows a schematic diagram for the control of a heat source 52 by the control device 48 (lower part) and the associated heat development at the heat source 52 (upper part).
  • a printing interval ti is shown.
  • a line n of the thermal direct printing paper is printed.
  • the printing interval ti is typically at least 300 ⁇ s long. In any case, the printing interval ti must not be longer than a line time tz and is in particular the same length as a line time tz.
  • the thermal direct printing paper 34 has been moved by the printing roller 40 from line n-1 to line n.
  • the thermal direct printing paper 34 is on line n at the beginning of the printing interval.
  • the printing interval consists of a saturation interval ts, during which the heat source 52 is supplied with power by the control device 48.
  • the printing interval ti also consists of a cooling interval ta following the saturation interval ts. If the printing interval ti is shorter than the line time tz, the thermal direct printing paper 34 is transported to the next line n+1 following the printing interval ti and until the end of the line time tz.
  • the thermal direct printing paper 34 is transported to the next line n+1 in the late part of the cooling interval ta and until the end of the line time tz/the printing interval ti.
  • the saturation interval begins with a waiting time tw, tw ⁇ , tw".
  • a current is applied to the heat source 52 by the control device 48.
  • the heat source 52 begins to heat up to the pressure temperature TD and maintains the pressure temperature TD until the end of the saturation interval ts.
  • the saturation interval ts is the same length for all heat sources 52 of the print head, with the waiting time tw, tw ⁇ , tw" being calculated separately for each heat source 52 of the print head based on the previous lines n-1, n-2, n-3 (history control).
  • the cooling interval ta no current is applied to the heat source 52 by the control device 48 and the temperature at the heat source 52 falls to its initial value during this time.
  • the control device 48 determines the length of the saturation interval ts.
  • a heat source is always heated to the printing temperature.
  • the method does not include a first temperature for printing the first colour and a second temperature for printing the second colours.
  • the active heat sources 52 are always heated to the printing temperature TD.
  • the other heat sources 52 are inactive heat sources 52 and are not heated.
  • Fig.4 shows a schematic representation of a thermal direct printing paper 34 for two-color printing in a first embodiment.
  • the thermal direct printing paper comprises a paper layer 12.
  • An adhesive layer 14, i.e. an adhesive layer, is applied to the underside of the paper layer 12.
  • a first thermo-reactive layer 22 is applied above the paper layer 12, which forms a first color, in particular red, when heat is applied.
  • the first thermo-reactive layer 22 turns red at a temperature of 70° C to 85° C, in particular 75° C to 80° C.
  • a second thermo-reactive layer 20 is applied to the first thermo-reactive layer 22, which forms a second color, in particular black, when heat is applied.
  • the second thermo-reactive layer 20 turns black at a temperature of 90° C to 110° C, in particular 95° C to 105° C.
  • a silicone layer 16 is applied above the second thermoreactive layer 20, which prevents the adhesive layer 14 from adhering and enables the adhesive layer 14 to be released when a continuous strip of the direct thermal printing paper 34 is rolled up into a roll.
  • Both the first thermo-reactive layer 22 and the second thermo-reactive layer 20 are transparent when no heat has been applied to them.
  • thermo-reactive layer 22 turns red and the second thermo-reactive layer 20 remains transparent. A red print is produced. If a second temperature is applied to the thermal direct printing paper 34, the second temperature being higher than the first temperature, in particular 95° C to 105° C, the first thermo-reactive layer 22 turns red and the second thermo-reactive layer 20 turns black. The second thermo-reactive layer 20 covers the first thermo-reactive layer 22 so that only the black color in the second thermo-reactive layer 22 is visible. A black print is created.
  • Fig.5 shows a schematic representation of a thermal direct printing paper 34 for two-color printing in a second embodiment.
  • first thermoreactive layer and second thermoreactive layer.
  • a thermoreactive layer 18 is applied to the paper layer 12, which turns red when a first temperature is applied and turns black when a second temperature is applied.
  • Fig. 6 to 15 show various control patterns for controlling the heat sources of the print head 42 (right graphic in landscape format) and the resulting print image on the thermal direct printing paper 34 (left graphic in landscape format).
  • the control patterns form regular grids.
  • the control data for the thermal direct printer are derived from the control patterns.
  • the print head is controlled with the control data resulting from a line t0, tz, 2*tz of the control pattern at the times at which the corresponding line n, n+1, n+2 of the thermal direct printing paper is located under the print head.
  • the drawings of the print head 42 show 14 heat sources 52 lying next to each other, which are controlled by the control device 48 independently of one another, regularly and depending on the line time.
  • a 1 means an active heat source, i.e.
  • the heat source 52 has a current and temperature profile as shown in Fig.3 shown schematically.
  • a 0 indicates an inactive heat source 52, which means that no heating power is provided by this heat source.
  • the printed image on the thermal direct printing paper 34 is shown schematically.
  • a black area in the drawings indicates a black pixel.
  • a hatched area in the drawings indicates a red pixel.
  • a white area indicates an unprinted, i.e. white area on the thermal direct printing paper 34.
  • Regular grids are shown in each case, which are taken from a larger area. This is therefore a zoom view of an area that appears to be the same color.
  • a resolution of 300 dpi requires printing with approximately 12 dots/mm. This means that the Fig. 6 to 12
  • the fields shown have a size of approximately 1.16 mm * 1.16 mm (-1.36 mm 2 ).
  • Fig.6 shows a control pattern with a high proportion of black dots. 75% of the heat sources are active. This means that only 25% of the heat sources are inactive. A black color forms at the active heat sources, which is overlaid with the red color that forms at the inactive heat sources. The area shown has a dark red tone due to the overlay of the black and red colors. The human eye does not recognize the individual pixels, but only an area that forms this red tone.
  • Fig. 7 to 12 show areas that form different shades of red with different proportions of black pixels, red pixels and white pixels. Individual heat sources in a row are activated by the control device. A black pixel is formed under these heat sources, red pixels are formed in its surroundings and no discoloration of the white thermal direct printing paper occurs at a greater distance. Different color effects can be achieved with different grids. The human eye sees red tones of different brightness.
  • Fig. 13 to 15 do not show square print areas, but are extended by one or two lines to complete the illustration. No regular grids are selected that can be mentally extended beyond the edges of the drawings shown. Instead, closed shapes are shown.
  • Fig. 13 shows a square black dot of 4x4 pixels (0.3 mm * 0.3 mm at 300 dpi).
  • the thermal direct printing paper is moved quickly under the print head by the printing roller.
  • the Fig.3 The cooling interval ta shown is not large enough for the heat sources to have cooled down sufficiently at the time (6*tz, 7*tz - lines n+6, n+7). Therefore, the red color runs a little behind and after the black pixels are printed in the transport direction, not only the pixels of the next line but also the pixels of the line after that are colored red. The same effect occurs in Fig. 14 on.
  • Fig. 14 shows a section of a barcode consisting of two bars, printed in black.
  • the black bars are of different lengths. This is therefore the bottom left edge of a barcode.
  • the bars at the edge of the barcode are slightly longer than in the middle, as the number corresponding to the barcode is printed in the middle of the barcode. Due to the reaction of the thermal direct printing paper, it is advantageous to position the bars of a barcode lengthwise in the direction of transport. The red fade effect on the printed paper is therefore at the end of the bars and not distributed across the barcode. This makes the barcode easier to scan.
  • Fig. 15 shows schematically the printing of a number in black.
  • the number comprises very few pixels and would in reality be printed with significantly more black pixels.
  • the red component is then in reality negligible, so that the black printed number only has a very thin red border that is barely visible to the human eye.
  • Fig. 16 shows a schematic representation of a method for creating control data for a direct thermal printer.
  • the control device 74 of the data processing device 70 receives an input from an operator. The operator specifies image data of an original image, for example by making a corresponding design via the input/output device 72.
  • the control device 74 identifies areas in the image data that are black and areas that are red.
  • control patterns in which all print pixels are active print pixels are created for the black areas.
  • the brightness of the red areas is determined.
  • a grid is defined for the red areas with a first brightness in order to print the red areas with the first brightness in the corresponding brightness.
  • the control pattern for these areas with the corresponding active print pixels is derived from the grid.
  • a grid is defined for the red areas with a second brightness in order to print the red areas with the second brightness in the corresponding brightness.
  • the control pattern for these areas with the corresponding active print pixels is derived from the raster. For all other red areas with a different brightness, steps analogous to steps 108, 110 are carried out.
  • the control patterns of the individual areas are connected to each other and a control pattern for printing is determined.
  • the resulting print image is shown to the operator for approval using the input/output device. If the operator approves the print image, the control data for the direct thermal printer are derived from the control patterns in step 116, i.e. the data for controlling the print head for each line n, n+1, n+2 are determined.
  • the control data are sent from the data processing device 70 to the direct thermal printer 30 via the transmitting/receiving device 76.
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • ROM read only memory
  • RAM random access memory

Landscapes

  • Electronic Switches (AREA)

Claims (12)

  1. Procédé de génération de données de commande destiné au fonctionnement d'une imprimante thermique directe (30) pour l'impression sur du papier d'impression thermique directe (34), le papier d'impression thermique directe comprenant au moins une couche thermoréactive (20, 22), au moins deux couleurs pouvant être formées dans ladite au moins une couche thermoréactive, la couche thermoréactive formant une première couleur lors de l'application d'une première température et formant une seconde couleur lors de l'application d'une seconde température, la seconde température étant supérieure à la première température, l'imprimante thermique directe comprenant, le long d'un trajet de papier allant d'un réceptacle de papier (46) à une sortie de papier (44), une tête d'impression (42) qui comprend des sources de chaleur (52) juxtaposées transversalement au trajet de papier et pouvant être commandées électriquement, qui appliquent ponctuellement de la chaleur au papier d'impression thermique directe pouvant être déplacé le long de la tête d'impression, et l'imprimante thermique directe comprenant un dispositif de commande (48) auquel chaque source de chaleur de la tête d'impression est connectée électriquement et qui est conçu pour chauffer des sources de chaleur sélectionnées de la tête d'impression à une température d'impression, la température d'impression étant égale ou supérieure à la seconde température, le procédé comprenant les étapes suivantes :
    - réception, par l'intermédiaire d'un dispositif d'entrée/sortie (72) ou d'un dispositif de réception (49), des données d'image d'une image originale qui présente au moins une première couleur et une seconde couleur,
    - génération, au moyen d'un dispositif de commande, de données de commande destinées à une imprimante thermique directe pour l'impression bicolore d'une image d'impression composée de la première couleur et de la seconde couleur, les données de commande comprenant plusieurs lignes d'impression et, pour chaque ligne d'impression et pour chaque source de chaleur de la tête d'impression, provoquent soit le chauffage de la source de chaleur à la température d'impression, soit l'absence de chauffage de la source de chaleur.
  2. Procédé de génération de données de commande selon la revendication 1, dans lequel, aux endroits où la seconde couleur doit être formée sur le papier d'impression thermique directe, les données de commande provoquent le chauffage de plusieurs sources de chaleur contiguës à la température d'impression et, aux endroits où la première couleur doit être formée sur le papier d'impression thermique directe, les données de commande de plusieurs sources de chaleur contiguës provoquent le chauffage à la température d'impression pour une partie des sources de chaleur et ne déclenchent pas de chauffage pour l'autre partie des sources de chaleur.
  3. Procédé de génération de données de commande selon la revendication 1 ou 2, le procédé comprenant les étapes suivantes :
    - identification dans les données d'image, au moyen du dispositif de commande, de zones de la première couleur et de zones de la seconde couleur,
    - génération, au moyen du dispositif de commande, d'un motif de commande bidimensionnel, les zones des données d'image de la seconde couleur étant formées dans le motif de commande par des pixels d'impression actifs et les zones des données d'image de la première couleur étant formées par une trame régulière de pixels d'impression actifs et passifs, et
    - conversion, au moyen du dispositif de commande, du motif de commande en données de commande en convertissant à partir du motif de commande les pixels d'impression actifs et passifs ligne par ligne en données de commande destinées aux sources de chaleur.
  4. Procédé de génération de données de commande selon la revendication 3, dans lequel la trame régulière est une trame qui se répète ligne par ligne et/ou colonne par colonne ou qui est disposée de manière oblique.
  5. Procédé de génération de données de commande selon la revendication 3 ou 4, dans lequel, dans le motif de commande, des zones de la première couleur dans les données d'image sont représentées dans différentes trames régulières sur la base de leur luminosité, les zones sombres de la première couleur dans le motif de commande comprenant en particulier plus de pixels d'impression actifs que les zones claires de la première couleur.
  6. Procédé de génération de données de commande selon l'une quelconque des revendications 3 à 5, dans lequel, pour éclaircir une zone de la seconde couleur dans le motif de commande pour la zone constituée de pixels d'impression actifs dans une trame régulière, plusieurs, en particulier plusieurs groupes de pixels d'impression juxtaposés, sont des pixels d'impression inactifs.
  7. Procédé de génération de données de commande selon l'une quelconque des revendications 1 à 6, dans lequel le dispositif d'entrée/sortie comprend un affichage sur lequel est représentée une interface utilisateur graphique, et dans lequel le dispositif d'entrée/sortie est conçu pour recevoir des entrées pour créer une présentation d'étiquette, les entrées comprenant des caractères, des graphiques standard, des couleurs, des tailles, des orientations et/ou des positions, le dispositif de commande étant conçu pour représenter sur le dispositif d'entrée/sortie l'image d'impression résultant des données de commande générées, et en particulier pour la confronter à l'image originale.
  8. Procédé de génération de données de commande selon l'une quelconque des revendications 1 à 7, dans lequel le dispositif de commande comprend un dispositif de reconnaissance d'objet qui reconnaît au moins un code à barres dans les données d'image provenant d'une image originale reçue par l'intermédiaire du dispositif d'entrée/sortie ou du dispositif de réception, et délivre un message d'erreur dans le cas où le code à barres ne présente pas la seconde couleur et/ou n'est pas aligné dans une direction d'impression.
  9. Procédé de génération de données de commande selon l'une quelconque des revendications 1 à 8, dans lequel le dispositif de commande destiné aux données d'image provenant d'une image originale reçue par le dispositif de réception exécute les étapes suivantes :
    - détermination de zones qui présentent une couleur et une luminosité, les couleurs de la zone correspondant au moins à la première couleur, à la seconde couleur, au blanc ou à une superposition de celles-ci, et
    - détermination d'une trame de pixels d'impression actifs et inactifs pour les zones individuelles.
  10. Procédé de génération de données de commande selon l'une quelconque des revendications 1 à 9, dans lequel le dispositif de commande destiné aux données d'image provenant d'une image originale reçue par le dispositif de réception exécute les étapes suivantes :
    - rendu des données d'image en points ayant une taille d'au moins 9 ou 25 pixels d'impression,
    - détermination d'une couleur et d'une luminosité pour chaque point, et
    - détermination de données de commande pour chaque point, des pixels d'impression actifs et inactifs étant déduits pour chaque point à partir de la couleur et de la luminosité de ce point.
  11. Dispositif de traitement de données (70) comprenant un dispositif d'entrée/sortie (72), un dispositif de commande (48), en particulier une CPU, et un dispositif d'émission/réception (49) destiné émettre et à recevoir des données par l'intermédiaire d'un réseau, le dispositif de commande étant conçu pour mettre en oeuvre un procédé de génération de données de commande destiné au fonctionnement d'une imprimante thermique directe (30) pour l'impression sur du papier d'impression thermique directe (34) selon l'une quelconque des revendications 1 à 10, et le dispositif d'émission/réception étant conçu pour envoyer les données de commande et/ou les motifs de commande à l'imprimante thermique directe par l'intermédiaire du réseau.
  12. Imprimante thermique directe (30) pour l'impression sur du papier d'impression thermique directe (34), le papier d'impression thermique directe comprenant au moins une couche thermoréactive (20, 22), au moins deux couleurs pouvant être formées au moyen de ladite au moins une couche thermoréactive, une première couleur étant formée lors de l'application d'une première température et une seconde couleur étant formée lors de l'application d'une seconde température, la seconde température étant supérieure à la première température, et comprenant un rouleau de transport (40) qui déplace le papier d'impression thermique directe le long d'un trajet de papier allant d'un réceptacle de papier (46) à une sortie de papier (44), et comprenant une tête d'impression (42) qui comprend des sources de chaleur (52) juxtaposées transversalement au trajet de papier et pouvant être commandées électriquement, qui appliquent ponctuellement de la chaleur au papier d'impression thermique directe, l'imprimante thermique directe comprenant un dispositif de commande (48) qui commande une rotation du rouleau de transport et déplace le papier d'impression thermique directe ligne par ligne au moyen du rouleau de transport le long de la tête d'impression dans une direction d'impression, chaque source de chaleur de la tête d'impression étant connectée électriquement au dispositif de commande et pouvant être chauffée à une température d'impression, et le dispositif de commande étant conçu pour mettre en œuvre un procédé de génération de données de commande destiné au fonctionnement d'une imprimante thermique directe pour l'impression sur du papier d'impression thermique directe selon l'une quelconque des revendications 1 à 10 et le dispositif de commande étant conçu pour commander les sources de chaleur au moyen des données de commande.
EP20218029.5A 2020-12-31 2020-12-31 Procédé de génération des données de commande destiné à l'impression directe thermique multicolore Active EP4023448B1 (fr)

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EP20218029.5A EP4023448B1 (fr) 2020-12-31 2020-12-31 Procédé de génération des données de commande destiné à l'impression directe thermique multicolore
US17/557,155 US12128692B2 (en) 2020-12-31 2021-12-21 Method for creating control data for multi-color direct thermal printing

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EP1006000A1 (fr) 1998-11-30 2000-06-07 Agfa-Gevaert N.V. Procédé d'impression d'étiquette pour materiaux d'imagerie thermique directe comprenant un sel d'argent organique
KR100348038B1 (ko) 1999-07-21 2002-08-09 세이코 엡슨 가부시키가이샤 서멀 프린터 및 그 열 이력 제어 방법
KR100530648B1 (ko) 2001-06-14 2005-11-22 세이코 엡슨 가부시키가이샤 발열 헤드 제어 방법 및 제어 장치
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EP1910086B1 (fr) * 2005-06-23 2012-12-19 Zink Imaging, Inc. Techniques d'envoi d'impulsions sur une tete d'impression pour imprimantes couleur a impression directe, thermique, polychrome
US20160257130A1 (en) * 2014-08-01 2016-09-08 Seiko Epson Corporation Print medium, print medium unit and printing device

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US12128692B2 (en) 2024-10-29
US20220203703A1 (en) 2022-06-30

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