EP1897696A2 - Procédé destiné à l'impression d'objets - Google Patents

Procédé destiné à l'impression d'objets Download PDF

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Publication number
EP1897696A2
EP1897696A2 EP07010747A EP07010747A EP1897696A2 EP 1897696 A2 EP1897696 A2 EP 1897696A2 EP 07010747 A EP07010747 A EP 07010747A EP 07010747 A EP07010747 A EP 07010747A EP 1897696 A2 EP1897696 A2 EP 1897696A2
Authority
EP
European Patent Office
Prior art keywords
printing
image
printed
pixels
color
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.)
Withdrawn
Application number
EP07010747A
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German (de)
English (en)
Inventor
Klaus Pechtl
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.)
KBA Metronic GmbH
Original Assignee
KBA Metronic 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 KBA Metronic GmbH filed Critical KBA Metronic GmbH
Publication of EP1897696A2 publication Critical patent/EP1897696A2/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J3/00—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
    • B41J3/407—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed for marking on special material
    • B41J3/4071—Printing on disk-shaped media, e.g. CDs

Definitions

  • the invention relates to a method for rotary printing of flat, in particular circular disk-shaped objects by means of a freely programmable printing process wherein the printing takes place about a perpendicular to the printing plane axis of rotation extending in the radial direction to the axis of rotation print head.
  • the invention further relates to a device for printing flat, in particular circular disk-shaped objects.
  • a freely programmable type of printing is for example in the DE 699 03 607 and in the DE 101 27 659 described.
  • the data carriers to be printed in a device are recorded in different versions so that the disk or the holder with the disk or located above the surface to be printed printheads can rotate in a holder about a central axis.
  • the surface of the data carrier is then printed in one or more circulations, in which case the inkjet printheads can be radially displaced as a function of the angle of rotation, so as to achieve a higher dot resolution or, when using printheads with a small print width, to print area to be printed strip by strip.
  • the drop frequency of the individual nozzles with the rotational movement of the data carrier or the Recording device for the disk synchronized so that there is a homogeneous impression of the printed image.
  • a disadvantage of the described embodiment is that such printheads used in the patents are not commercially available or are available only with a small print width.
  • Commercially available large print width printheads control the included nozzles with a common pulse so that a full print line is always printed across the print direction with a single print impulse.
  • the object of the invention is to eliminate the disadvantages mentioned, so that commercially available printheads can be used with a large printing width and thus to provide a method and an apparatus, whereby it is possible, an object such as a disk, in particular disk-shaped disk in rotativer Way to print by a freely programmable printing method especially in a single revolution so that the resulting print resolution and / or print density of the printed image is substantially constant, especially within close tolerances over the entire image area and thus a homogeneous image impression of the printed image in a viewer arises.
  • the object of the invention is furthermore to expand the method so that a moiré effect is minimized in a multicolor printing in successive printing stations.
  • the object is achieved according to the invention by the preparation of the print data of the image to be printed and the type of execution of the device for printing according to the independent claims.
  • the invention makes use of the fact that print data of the images to be printed, in particular in the case of freely programmable printing, are usually further processed as files in electronic form. In most cases, the print data is in the form of a bitmap image. Such an image can form an output image of the method according to the invention, which is processed according to the invention prior to a printing process.
  • an output image exists as a black-and-white image or as a grayscale image
  • the method according to the invention can be carried out directly with this output image.
  • a multicolor output image it may be provided to split this output image or a multicolor intermediate image formed in the process according to the invention into monochrome partial color images and to further process each of these monochrome partial color images according to the invention and then to print the partially colored printed images one above the other, in turn to obtain a multicolored print image on the object to be printed.
  • each pixel to be printed by one or more bytes are described, which include the coordinates of each pixel and its color values.
  • the entire image can be constructed as a rule as a matrix of pixels or be converted by means of known methods into such, wherein the matrix, in particular an original unprocessed original image, a rectangular, i. Based on the Cartesian coordinate system and thus the location of each pixel in this output image is determined by its X-coordinate and its Y-coordinate.
  • the color information of each pixel may vary depending on the underlying color model, for example, by RGB values for the colors red, green and blue or by the CMYK values preferred for printing applications for the inks cyan (C), magenta (M), yellow (yellow) and black (contrast).
  • C cyan
  • M magenta
  • M yellow
  • black black
  • other color models can be used depending on the requirements.
  • monochrome images e.g. only the color saturation or color density of a color can be specified.
  • each individual pixel is thus represented by its own color value, the brightness and color of which are determined by the combination of the abovementioned color values.
  • Such an image can not yet be printed directly with the conventional printing methods available, since almost all printing processes always build up mixed colors and their brightnesses from individual printing dots which lie next to one another and / or partially one above the other.
  • the actual pressure points are usually chosen smaller than the pixels to be displayed, so as to the size of the pressure points and / or their distribution within the pixel for the viewer the actual Color and brightness value as optimal as possible. It is always assumed in particular in conventional printing applications of a white background, which is more or less covered by the applied printing inks and can be seen in the color view as an additional color.
  • Such a ripped image now has a separate color separation for each color, according to the inks used in printing.
  • Different bright areas within the respective color separations are generated by a different area occupancy of the corresponding pixel, so that, for example, a pixel that has a brightness of 50% can be generated by the fact that half of the pixel in the print is occupied by a 100% color and the other half stays clear, revealing the white background.
  • the color separations thus only contain the information at which positions of the image to be printed pressure points are set, so they have a binary character.
  • Each color separation furthermore generally has a higher number of printing dots than the number of pixels of the output image, which results from the demand for the best possible reproduction of the color and brightness values of the output image in the printed image, in particular if the printing process is a purely binary printing process, as is the case for example Thermal transfer printing or most ink jet printing is the case.
  • the shape and boundaries of the surface to be printed of the printing object are superimposed as a mask, so that only the areas actually to be printed are temporarily stored as new image data of an already masked out output image.
  • a mask may also be present as a file, e.g. is linked to the image data with a logical function.
  • the masked output image likewise has a circular shape and has the aforementioned recess. Over the print object protruding areas of the output image are thus removed via said mask.
  • Masking out can be done at any time in the method according to the invention, and is therefore not limited to being applied directly to the original image. Masking out can also take place only in one of the intermediate images, but the masking out of the output image is perceived as advantageous since, in the following, less data volume has to be processed and thus computer time is saved in the case of software or a computer which performs the method according to the invention On the other hand, the mask must correspond to the coordinate system used in the respective intermediate image, which means an additional effort.
  • the printed image is no longer printed in the usual manner in a rectangular or Cartesian coordinate system but in a polar coordinate system by a printing line of a printing process such as the print line of a thermal transfer printer or thermal sublimation printer or the print head an ink jet printer is rotated about an axis of rotation perpendicular to the print line of the print head, thereby printing on a surface to be printed.
  • This first intermediate image does not have to be present as an actual viewable image, but it is essential for the invention that the image data are processed accordingly and thus yield such a virtual or imaginary first intermediate image.
  • the conversion can be carried out, for example, by calculating, for example, starting from the center of the later rotary printing, for example the center of a CD, the radius and the angle for each pixel to be printed from the rectangular coordinates. Instead of the previous Cartesian coordinates Then the associated polar coordinates can be stored for each pixel.
  • Such a representation can be present as a virtual representation in a Cartesian coordinate system and represents a second intermediate image within the meaning of the invention. It is not necessary for the second intermediate image to actually be displayed, but it is also possible.
  • All intermediate images can e.g. only virtual, e.g. as a file stored on a computer.
  • a brightening in the direction of the radius can take place, that is to say in the direction of the printing line of a print head, which is aligned in rotational pressure radially to the axis of rotation.
  • the degree of lightening can preferably be a function of the radius coordinate of the respective pixel.
  • it may be a linear brightening, which is given by the ratio of the respective radius of a considered pixel to the largest radius to be considered.
  • R a for pixels with a maximum radius R a, for example, no brightening would take place.
  • the respective brightening function can in this case be adapted in particular to the printhead used in each case.
  • the degree of lightening may substantially correspond to the linear distortion factor along the radius of the above-mentioned pixel distortion, so that the smaller the radius R i , the brighter the pixel corresponding to its distortion.
  • This relationship between distortion and brightness may be linear or generally follow a mathematical function or may be arbitrary depending on the requirement and the desired print result.
  • the above-mentioned stretch factor may also be a function of the radius coordinate of the respective pixel.
  • the implementation of an extension has the advantage that a closed third intermediate image can be generated.
  • a fourth intermediate image e.g. superimposed with a grid, hereinafter called gray scale grid, wherein the at least partially lying in a grid area pixels of the fourth intermediate image can be combined to form a pixel to be printed.
  • Such an overlay is also preferably only virtual, ie essentially software-based.
  • the grid may e.g. be formed like a checkerboard, preferably for the subsequent printing process, the grid is adapted to the printing process and the distance of adjacent fields of the grid along the X-axis and the Y-axis respectively corresponds to the distance of the individual pixels to be printed, and wherein for a symmetrical resolution the distances in the X and Y directions can preferably be selected to be the same size.
  • the gray value and / or color value of a pixel to be printed combined in a raster area is determined in each case from the proportionate gray / color values of the combined pixels.
  • the pixels to be printed which are defined by the gray-scale grid, or their color or gray levels, may be such as e.g. as an average value of the proportions of the neighboring and optionally stretched pixels of the second intermediate image overlapping this field, so that a printed image results therefrom.
  • the pixels within the superimposed gray scale grid can also be rearranged, since this gray scale grid is adapted exactly to the printing grid of the subsequent printing.
  • this gray scale grid is adapted exactly to the printing grid of the subsequent printing.
  • the Overlap degree of the respective pixels to adjacent grids for example, only a shift of the pixel in the adjacent grid can be made or new pixels are generated by weighting from adjacent pixels with the respective percentage overlaps new pixels are calculated at the grid positions. It is of course also possible to use a combination of both methods
  • a thermal transfer printing method or a binary inkjet printing method is used as the printing method, whereby only printing dots of the same size can be produced, then the respective different hues or gray values of each individual screen of the printed image can be printed by a distribution and arrangement of equally large printing dots within a grid, which represents the pixel.
  • the actual print raster is thus finer than the raster of an intermediate image, in particular the printed image, and a field of the gray scale raster comprises e.g. a square arrangement of print grid points.
  • Different surface occupation states of the printed grid can be generated, ie on the one hand the empty state and on the other hand an occupancy of 1 to 100 percent.
  • the hue or gray value of each individual screen of the gray scale screen and thus each pixel to be printed can each be replaced by one single pressure point of appropriate size within the grid approximated.
  • the printing grid may expediently simultaneously correspond to the gray scale grid.
  • a single-color rectangular image is to be printed on the surface of a CD which is present as a digital bitmap file and whose respective pixels can assume gray values from 0 to 255, where 0 corresponds to the color white and 255 corresponds to the color black.
  • a mathematical mask whose shape corresponds to the areas to be printed is placed on the image format of the output image in the form of a rectangle, whereby the areas lying outside the printable area of the CD are cut off, i. be unmasked.
  • the masked output image 1 is now moved along its circular circumference 3, e.g. by means of a suitable software on a computer in such a way by 360 degrees unrolled that all pixels except for the outermost circumference pixels are stretched along their tangent to the respective circular arc.
  • the image 4 for example, a linear brightening along the short side 6, as shown in FIG. This results in the fourth intermediate image in the sense of the invention.
  • a gray scale grid is now placed over the fourth intermediate image 4 thus produced, whereby the printing positions of the individual pixels to be printed are determined and thus results in a printed image.
  • the gray value of each individual grid cell of the gray scale grid can be obtained as an average value from the gray values of the pixels of the fourth intermediate image 4 that are wholly or partially located in this grid, and from their respective corresponding calculated weighting. This results in a printed image.
  • each pixel of the gray scale grid to be printed is represented by a halftone dot matrix of, for example, 4 ⁇ 4, which results in different possible gray values for each later printed pixel 113.
  • the conversion of the print image into the halftone image to be printed is therefore carried out in a subsequent fifth step by superimposing a print raster on the gray scale raster, whereby each raster field of the gray scale raster is subdivided into a 4 ⁇ 4 print dot matrix.
  • the gray value of the respective gray value of a grid of the gray scale grid to be realized in the actual printing is then produced by printing both a corresponding number of fields of the print grid and printing each field of the print grid to be printed with a printing point of corresponding (possibly different) size becomes.
  • the arrangement of the pressure points within the selected matrix is arbitrary and depends only on the software used or on the desired result. So it may be appropriate to choose a symmetrical arrangement in each 4x4 matrix or even a statistical distribution of pressure points, for example, to minimize a possible moire effect.
  • Each field of the print grid can be assigned a number from 0 to 7, which represents the print dot size for the respective field of the print grid.
  • the number 0 stands for no printing, the numbers 1 to 7 for the corresponding different size of the point to be printed. That so generated halftone image is subsequently printed on the surface of the CD in a sixth step by means of the device described below.
  • Each of the color separation images thus produced is further processed in the manner described in Example 1, wherein the distribution of the pressure points of each pixel within the respective grid dot matrix is to be selected such that the color separations successively printed on the CD show no moire effect to each other.
  • the device according to the invention for printing the CD with a printed image prepared according to the invention essentially comprises a recording device 10 for the data carrier 11 to be printed, a printing device 12 located above the surface to be printed, a control device 13 and a drive element 14, for example
  • the to be printed disk 11 can be for printing eg be inserted into a recess 20 provided on the receiving device 10. It can preferably be provided to center the data carrier there and to fix it by means of suitable devices, not shown, for example by means of a negative pressure (vacuum).
  • the receiving device 10 can be designed so that it is rotatably mounted with the particular fixed disk 11 about a rotation axis 15 and can rotate about a drive 14 with a predetermined speed via the control device 13 speed in the direction of rotation 16.
  • a sensor 17 zero position 18 of the recording device 10 of the data carrier 11 by means of acting on the surface to be printed
  • Printing device 12 printed during its rotational movement by the respective printing dots to be printed according to the previously generated halftone image depending on the current rotation angle of the recording device 10 are printed.
  • the current rotation angle is measured with the sensor 17 and the value is transferred to the higher-level control 13, which controls the printing device 12 as a function of the current position of the recording device 10, for example by transmitting the pressure points given at an angle.
  • the printing device 12 includes, for example, one or more conventional ink jet printheads, the respective nozzles of which are driven in a known conventional manner, whereby with each pressure pulse always a plurality of nozzles or all are driven simultaneously.
  • a printed image prepared according to the invention is printed with the complete image in the case of only a single relative circulation of printing device to the recording device.
  • one or more thermal transfer print heads or thermal sublimation heads can also be used as printing device.
  • Such commercially available printheads are controlled in a similar manner as the already mentioned inkjet printheads so that with each pressure pulse always a variety or even all elements of the thermal bar are driven, so that in this case always a complete line or a larger portion thereof with a single Pressure pulse is generated.

Landscapes

  • Record Information Processing For Printing (AREA)
  • Ink Jet (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
  • Color, Gradation (AREA)
EP07010747A 2006-09-05 2007-05-31 Procédé destiné à l'impression d'objets Withdrawn EP1897696A2 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102006042068A DE102006042068A1 (de) 2006-09-05 2006-09-05 Verfahren zum Bedrucken von Objekten

Publications (1)

Publication Number Publication Date
EP1897696A2 true EP1897696A2 (fr) 2008-03-12

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EP07010747A Withdrawn EP1897696A2 (fr) 2006-09-05 2007-05-31 Procédé destiné à l'impression d'objets

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US (1) US20080062440A1 (fr)
EP (1) EP1897696A2 (fr)
JP (1) JP2008062646A (fr)
DE (1) DE102006042068A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106965582B (zh) * 2017-04-13 2023-01-20 张家港保税区康得菲尔实业有限公司 一种3d图像效果预涂膜及其制备方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4438246C1 (de) 1994-10-26 1995-12-07 Metronic Geraetebau Druckeinrichtung zum Bedrucken von Compact-Discs (CD)
DE10127659A1 (de) 2001-06-07 2002-12-12 Kammann Maschf Werner Verfahren und Vorrichtung zum Bedrucken eines Objektes
DE69903607T2 (de) 1998-12-30 2003-06-26 Eastman Kodak Co Drucker zum Drucken auf eine Scheibe und Verfahren zum Zusammenbau des Druckers

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6264295B1 (en) * 1998-04-17 2001-07-24 Elesys, Inc. Radial printing system and methods
US7085017B1 (en) * 2001-08-03 2006-08-01 Elesys, Inc. Polar halftone methods for radial printing
US6838696B2 (en) * 2000-03-15 2005-01-04 Advanced Display Inc. Liquid crystal display

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4438246C1 (de) 1994-10-26 1995-12-07 Metronic Geraetebau Druckeinrichtung zum Bedrucken von Compact-Discs (CD)
DE69903607T2 (de) 1998-12-30 2003-06-26 Eastman Kodak Co Drucker zum Drucken auf eine Scheibe und Verfahren zum Zusammenbau des Druckers
DE10127659A1 (de) 2001-06-07 2002-12-12 Kammann Maschf Werner Verfahren und Vorrichtung zum Bedrucken eines Objektes

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Publication number Publication date
US20080062440A1 (en) 2008-03-13
DE102006042068A1 (de) 2008-03-20
JP2008062646A (ja) 2008-03-21

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