EP1176545B1 - Laserbebilderung mit variabler Druckpunktgrösse - Google Patents

Laserbebilderung mit variabler Druckpunktgrösse Download PDF

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Publication number
EP1176545B1
EP1176545B1 EP01114875A EP01114875A EP1176545B1 EP 1176545 B1 EP1176545 B1 EP 1176545B1 EP 01114875 A EP01114875 A EP 01114875A EP 01114875 A EP01114875 A EP 01114875A EP 1176545 B1 EP1176545 B1 EP 1176545B1
Authority
EP
European Patent Office
Prior art keywords
laser
printing
light source
distance
imaging
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP01114875A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1176545A2 (de
EP1176545A3 (de
Inventor
Bernd Vosseler
Bernard Dr. Beier
Uwe Ernst
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.)
Heidelberger Druckmaschinen AG
Original Assignee
Heidelberger Druckmaschinen AG
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 Heidelberger Druckmaschinen AG filed Critical Heidelberger Druckmaschinen AG
Publication of EP1176545A2 publication Critical patent/EP1176545A2/de
Publication of EP1176545A3 publication Critical patent/EP1176545A3/de
Application granted granted Critical
Publication of EP1176545B1 publication Critical patent/EP1176545B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/435—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material
    • B41J2/447—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using arrays of radiation sources
    • B41J2/45—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using arrays of radiation sources using light-emitting diode [LED] or laser arrays
    • B41J2/451—Special optical means therefor, e.g. lenses, mirrors, focusing means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00—Forme preparation
    • B41C1/10—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme
    • B41C1/1075—Mechanical aspects of on-press plate preparation
    • 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
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/435—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material
    • B41J2/44—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using single radiation source per colour, e.g. lighting beams or shutter arrangements
    • B41J2/442—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using single radiation source per colour, e.g. lighting beams or shutter arrangements using lasers
    • 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
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/435—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material
    • B41J2/47—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using the combination of scanning and modulation of light

Definitions

  • the invention relates to a device and a method for pointwise imaging of printing surfaces by means of at least one laser beam which is moved relative to the printing surface.
  • Imaging plates using CtP (Computer-to-Plate) or Direct Imaging Printing machines must be the distance between the printing surface and the optical system the imaging device are maintained very accurately in order to achieve an optimal result receive. For example, by vibrations of the machine in operation, but it comes to Deviations from the nominal distance between printing surface and imaging laser. How strong the quality of the Besselungsommees depends on the deviation from the nominal distance is among other things, by the beam quality of the laser and the selected beam parameters founded. In general, results from a deviation from the desired distance deformed pressure point, which depending on the beam parameters either larger or smaller than the predetermined target size is. For very strong deviations even no pressure point generated more on the printing surface, since the laser beam is so much expanded that on no position of the printing area more the imaging threshold is reached.
  • CtP Computer-to-Plate
  • Direct Imaging Printing machines must be the distance between the printing surface and the optical system the imaging device are maintained very accurately in order to achieve an optimal result receive. For example, by vibrations of the machine in operation, but it comes
  • US 5,764,272 describes an autofocus system for a laser imaging device disclosed.
  • This system has a laser and corresponding optics for forming a Light beam, which is focused on an image plane on.
  • a photodiode if a signal characteristic of the light reflected from the image surface is produced, then that the focus of the laser beam on the image surface the characteristic signal can be adjusted accordingly.
  • Shifting the focus of the imaging device may be the laser, the corresponding Optics or the image area are moved.
  • Such autofocus systems can work only limitedly fast.
  • the Laser optics procedure a non-negligible mass must be accelerated quickly, exactly be positioned and quickly braked again.
  • high-frequency interference like her for example, by contamination under the pressure surface, dust grains or by Kinks occur in the printing surface, the regular times that such a system requires too long. It therefore often comes to Bereciungshoun.
  • An imaging device with multiple parallel laser beams may typically not every single beam can be focused, because the entire imaging optics is moved. In other words, a compromise must be found so that the deviation from the nominal distance of all the simultaneous beams altogether becomes minimal. in the general is the construction of a mechanical, by movement of the Viewing optics autofocus system technically complex, needed corresponding space and causes relatively high costs.
  • WO97 / 27065 is a device for pointwise imaging of Printing surfaces on a drum known, with a variety of infrared laser diodes whose Input currents are variable, allowing the light intensity during imaging is selectively variable to affect the size of pressure points to be generated.
  • the Selective change is based on pre-calibration of the laser diode intensity by for this one correction function depending on the variations of the position of the Drum surface is defined relative to the device.
  • the correction function becomes the Determining a correction of the laser diode intensity used during the imaging, so that the currently used input currents can be determined in real time.
  • Object of the present invention is therefore an apparatus for pointwise Imaging of printing surfaces by means of at least one laser beam, which relative to Pressure surface is moved to provide, with which a variable Imaging can be performed without removing parts of the device, such as For example, the imaging optics, must be mechanically moved to Compensate for variations in the distance between imaging optics and printing surface.
  • the imaging optics of a imaging device are set in such a way that that at the desired distance the focus, i. H. the plane in which the laser beam its smallest diameter has, exactly on the surface of the printing surface comes to rest.
  • a deviation from the nominal distance between laser and printing surface results in a Magnification of the beam diameter on the printing surface and thus depending on how the Laser parameters of power and focus diameter are set in one Increase or decrease the pressure point.
  • the Light output is increased or decreased.
  • Another way to vary the size of the pressure point is to use the Exposure time to extend or shorten specifically. A combination of Changes in performance and exposure time are also possible.
  • the enlargement or reduction of the Pressure point due to a distance deviation are compensated:
  • the provided variable laser power can be an adjustment of the pressure point size done so that an acceptable Becouungs hamper is achieved.
  • the pressure point size is variable.
  • the value of the required light output or Exposure time can be calculated from the measured distance.
  • This feature can z. B. in the raster generator, the pattern of pressure points to be imaged in a temporal Sequence of pulses for the laser imaging implements to be met. advantageously, is in advance by the functional context a table, a so-called Lookup-Table, created and saved, so that in situ the required value immediately Available.
  • the device for pointwise Imaging of printing surfaces on multiple laser beams, with which simultaneously exposed becomes.
  • Particular preference is given to individually controllable diode laser arrays.
  • the power or imaging time can be varied be so that it is possible to achieve an acceptable Bercisungswoven, as the Size of each printed by a laser pressure point variable and the size of the independent of other pressure points.
  • the present invention requires significantly fewer moving parts than the known ones Autofokussysteme and can react much faster to disturbances. she at the same time achieves a much better imaging result than a device without Autofocus.
  • the realization of compact imaging device in integrated form is much easier. It is associated with lower costs.
  • Such a device can be inside or outside of a printing unit or a Printing machine can be used for point-by-point imaging.
  • Fig. 1 the variation of the spot size of a laser for spotwise imaging is shown by pressure surfaces.
  • the laser beam propagates along the optical axis 10, on which also its intensity maximum is.
  • focus 12 the Laser beam at its lowest waist.
  • the focus 12 defines the target distance of the laser to the printing surface.
  • the lines 18 indicate the variation of the Limiting the light spot as a function of position along the propagation direction. In focus 12, in a region 110, a greater intensity than the threshold intensity reached for imaging.
  • the area in which the intensity is above the threshold intensity becomes smaller, because the transported energy flows through a larger cross-sectional area.
  • At detained Laser intensity thus results in the area 112, in which the imaging threshold is exceeded.
  • the Area to be imaged 116 greater than the area reached at a fixed intensity 112. Consequently, according to the invention, the intensity of the laser is increased so that the region, in which the threshold intensity for imaging is exceeded becomes larger.
  • the Threshold intensity is then exceeded in the entire area 118. In actual distance 114 then the threshold intensity is reached in the entire area 116.
  • Fig. 2 shows the generation of a pressure point by relative movement of a laser beam against a printing surface.
  • a laser beam with a spot 22 falls onto a printing surface 20.
  • the laser is scanned over the printing surface 20 in such a way that the threshold intensity for imaging is exceeded in the entire region 24.
  • it is an elliptical Gaussian laser beam which has two different semi-axes.
  • the longer spot diameter w x 26 is perpendicular to the direction of movement.
  • the shorter spot diameter w y 28 lies in the direction of movement.
  • FIGS. 3a, 3b and 3c Examples of boundary lines of written pressure points of different laser parameters are shown in FIGS. 3a, 3b and 3c. In other words, that area is shown on which the threshold intensity for imaging is exceeded.
  • 3a shows the boundary line f of a pressure point with widths d x 9.3 microns and d y 10.6 microns.
  • Its width d is 8.5 microns, and its height d y is 9.8 microns.
  • the laser wavelength is 830 nanometers, and the diffraction factor M 2 is 1.1.
  • the spots w x and w y are 8.8 microns and 7.7 microns, respectively.
  • the power of the laser is increased by 10%.
  • the pressure point size can be made variable.
  • FIG. 3 b shows by way of example how a power adjustment can lead to a reduced pressure point.
  • reduced power which is optimized for writing a line
  • the boundary line 1 of a pressure point of width d x of 8.1 microns and the height d y of 9.5 microns is generated.
  • the actual distance deviates again by 100 micrometers from the nominal distance in the focus of the laser.
  • FIG. 3 c shows by way of example how an extension of the exposure time, in other words of the duration of the load beam, leads to an increase in the pressure point both in the x direction and in the y direction.
  • a boundary line v of a pressure point is seen, which is generated at a time line extension of the exposure from 10 microseconds to 11 microseconds.
  • the point thus created has the widths d x 9.5 microns and d y 10.8 microns.
  • the parameters of the generating beam are the same as for the beam, which produces a pressure point with the boundary line u, as also shown in Fig. 3a.
  • FIGS. 3 a, 3 b and 3 c exemplifies how a pointwise imaging of printing surfaces with the help of at least one laser beam Variable pressure point size achieved by variable laser power or exposure time becomes. Changes in distance between the printing surface and laser focus are instead of a Movement of the imaging optics, the laser itself or the printing surface, as in Autofocus systems is common, balanced by adjusting the laser power.
  • a preferred embodiment of the invention for imaging a Pressure surface which is located on a rotatable cylinder shown.
  • the laser light source 40 generates a laser beam 42 which mediates an imaging optics 44 on the located on a cylinder 46 pressure surface 48 in Item 410 is mapped.
  • the cylinder 46 is rotatable about its axis of symmetry. These Rotation is indicated by the double arrow B.
  • the laser light source 40 may be parallel to Symmetryeachse of the cylinder 46 are moved in a linear manner, which by the Double arrow A is marked.
  • the cylinder 46 rotates with the Pressure surface 48 according to the rotational movement B, and the laser light source 40 moves along the cylinder according to the translation direction A.
  • the result is an image, which rotates in helical ways the axis of symmetry of the cylinder 46.
  • the rangefinder 414 emits a light beam 416 which reaches the printing surface 48 at the pixel 418.
  • the necessary information about the distance of the laser light source 40 with the pixel 410, which is used for imaging are obtained to the printing surface 48.
  • a connection for the exchange of data and / or control signals 420 is the rangefinder 414 with a device for calculating the necessary Laser power 422 linked.
  • Via connection 424 is the means for calculation the necessary laser power or exposure time 422 with the laser control 426 linked, which in particular can determine the laser power.
  • Data and / or Control signals between laser control 426 and laser light source 40 are on the Transfer connection 428.
  • the laser controller 426 may be above Be linked via a connection 430 with the machine control 432.
  • the laser light source 40 is made a laser diode array whose individual lasers can be controlled separately. It can then take place a simultaneous imaging of multiple pressure points whose Size is variable. For each individual pressure point, the deviation of the actual position of the desired position of the printing surface to the laser focus by the variable laser power or Exposure time be compensated.

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  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
  • Laser Beam Printer (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
  • Dot-Matrix Printers And Others (AREA)
  • Facsimile Heads (AREA)
  • Exposure And Positioning Against Photoresist Photosensitive Materials (AREA)
  • Laser Surgery Devices (AREA)
  • Electronic Switches (AREA)
EP01114875A 2000-07-24 2001-06-29 Laserbebilderung mit variabler Druckpunktgrösse Expired - Lifetime EP1176545B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10035848 2000-07-24
DE10035848A DE10035848A1 (de) 2000-07-24 2000-07-24 Laserbebilderung mit variabler Druckpuktgröße

Publications (3)

Publication Number Publication Date
EP1176545A2 EP1176545A2 (de) 2002-01-30
EP1176545A3 EP1176545A3 (de) 2003-08-06
EP1176545B1 true EP1176545B1 (de) 2005-12-28

Family

ID=7649933

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01114875A Expired - Lifetime EP1176545B1 (de) 2000-07-24 2001-06-29 Laserbebilderung mit variabler Druckpunktgrösse

Country Status (10)

Country Link
US (1) US6836282B2 (xx)
EP (1) EP1176545B1 (xx)
JP (1) JP4933001B2 (xx)
CN (1) CN1199802C (xx)
AT (1) ATE314697T1 (xx)
CA (1) CA2350448C (xx)
CZ (1) CZ297292B6 (xx)
DE (2) DE10035848A1 (xx)
HK (1) HK1043090B (xx)
IL (1) IL144484A0 (xx)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10212937B4 (de) 2002-03-22 2009-12-17 Heidelberger Druckmaschinen Ag Verfahren zur Einstellung der Bildlinienbreite in einem Belichter
CA2448193A1 (en) 2002-12-09 2004-06-09 Heidelberger Druckmaschinen Aktiengesellschaft Method and device for imaging a printing form
US7219453B2 (en) * 2003-01-24 2007-05-22 Baker Robert E Floatdown implement for small vehicles
CN1824499A (zh) * 2005-02-24 2006-08-30 海德堡印刷机械股份公司 用于制造印版的方法
JP6051535B2 (ja) * 2011-02-28 2016-12-27 株式会社リコー 画像処理方法及び画像処理装置
CN103331988B (zh) * 2013-06-19 2015-02-18 汪海洋 一种柔性印刷版的制版方法和主曝光设备
DE102016208479A1 (de) * 2016-05-18 2017-11-23 Roth + Weber Gmbh Elektrofotografischer Großformat-Farbdrucker
CN114734636B (zh) * 2022-04-20 2023-12-19 浙江正向增材制造有限公司 光固化打印装置及打印方法
CN114710628B (zh) * 2022-04-21 2023-12-05 深圳市先地图像科技有限公司 一种图像曝光方法、计算机设备及存储介质

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JPS59146068A (ja) * 1983-02-08 1984-08-21 Nippon Telegr & Teleph Corp <Ntt> 記録方法
JPS6016058A (ja) * 1983-07-08 1985-01-26 Hitachi Ltd 光ビ−ム走査装置
JP3181050B2 (ja) * 1990-04-20 2001-07-03 株式会社日立製作所 投影露光方法およびその装置
US5278581A (en) * 1990-09-17 1994-01-11 Kabushiki Kaisha Toshiba Printer for printing and image formed of 2-dimensionally arranged pixels, and method of printing the same
DK69492D0 (da) * 1992-05-26 1992-05-26 Purup Prepress As Apparat til exponering af et medie, apparat til punktexponering af et medie, samt en indretning til fastholdelse af et medie
DE59402148D1 (de) * 1994-04-26 1997-04-24 Schablonentechnik Kufstein Ag Verfahren und Vorrichtung zur Herstellung einer Siebdruckschablone
US5819661A (en) * 1995-01-23 1998-10-13 Presstek, Inc. Method and apparatus for laser imaging of lithographic printing members by thermal non-ablative transfer
US5666577A (en) * 1995-08-31 1997-09-09 Eastman Kodak Company System for switching pointing indices in laser aimed cameras
US5764272A (en) 1995-09-12 1998-06-09 Eastman Kodak Company Autofocus mechanism for laser imager
IL116885A0 (en) * 1996-01-24 1996-05-14 Scitex Corp Ltd An imaging apparatus for exposing a printing member
US5822345A (en) * 1996-07-08 1998-10-13 Presstek, Inc. Diode-pumped laser system and method
JPH1024546A (ja) * 1996-07-10 1998-01-27 Sony Corp レーザ製版装置及びレーザ製版方法
JPH1034866A (ja) * 1996-07-24 1998-02-10 Sony Corp オートフォーカス機能付きレーザ製版装置及びオートフォーカス検出用レーザの外乱を除去する方法
US6072511A (en) * 1997-12-12 2000-06-06 Presstek, Inc. Method and apparatus for diode-laser imaging with compensation for output variations
DE19848455A1 (de) * 1998-10-21 2000-04-27 Heidelberger Druckmasch Ag Vorrichtung zur Einstellung der Position eines zylindrischen Bildträgers in Bezug auf einen Abtastkopf

Also Published As

Publication number Publication date
CA2350448A1 (en) 2002-01-24
CN1334199A (zh) 2002-02-06
DE50108510D1 (de) 2006-02-02
CN1199802C (zh) 2005-05-04
CZ20012612A3 (cs) 2002-03-13
JP2002127355A (ja) 2002-05-08
ATE314697T1 (de) 2006-01-15
CZ297292B6 (cs) 2006-10-11
DE10035848A1 (de) 2002-02-07
JP4933001B2 (ja) 2012-05-16
HK1043090A1 (en) 2002-09-06
EP1176545A2 (de) 2002-01-30
US6836282B2 (en) 2004-12-28
HK1043090B (zh) 2005-12-09
US20020044196A1 (en) 2002-04-18
IL144484A0 (en) 2002-05-23
CA2350448C (en) 2007-01-09
EP1176545A3 (de) 2003-08-06

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