EP0805021A2 - Procédé pour la régulation de la température dans une machine pour l'inscription des plaques pour l'impression utilisant un rayonnement laser en particulier une machine offset - Google Patents
Procédé pour la régulation de la température dans une machine pour l'inscription des plaques pour l'impression utilisant un rayonnement laser en particulier une machine offset Download PDFInfo
- Publication number
- EP0805021A2 EP0805021A2 EP97105896A EP97105896A EP0805021A2 EP 0805021 A2 EP0805021 A2 EP 0805021A2 EP 97105896 A EP97105896 A EP 97105896A EP 97105896 A EP97105896 A EP 97105896A EP 0805021 A2 EP0805021 A2 EP 0805021A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- laser diode
- heat
- diode unit
- amount
- switched
- 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.)
- Granted
Links
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Classifications
-
- 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
- B41C1/1083—Mechanical aspects of off-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
- B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
- B41J29/377—Cooling or ventilating arrangements
Definitions
- the invention relates to a method and a device for regulating the temperature in a printing plate labeling unit working with laser light, in particular an offset printing machine, according to the preamble of claims 1 and 8.
- the labeling units For the labeling of printing plates that are used in printing presses, in addition to the conventional method of exposure using films, digitally working labeling units are now being used, to which the image information is supplied in the form of digital bit patterns generated in the prepress stage, which are supplied by the labeling units are transferred to the printing plate.
- the labeling units have a light source, the light of which is focused by an optical lens system on the respective location on the printing plate and which is switched on or off depending on whether an image point is to be generated on the printing plate at the corresponding location.
- No. 5,351,617 furthermore shows a device in which a plurality of optical focusing units, which are connected to corresponding laser light sources via optical fiber cables, are moved over a flat printing plate and expose it at the corresponding points.
- the problem arises that the intensity of the laser light is influenced to a large extent by the temperature of the respective laser light source, in this case a laser diode. Because of the known exponential dependence of the intensity of the generated laser light on the temperature in a laser diode, temperature fluctuations in the range from 0.5 ° to 2 ° C are sufficient to adversely affect the labeling result in such a way that the resulting quality losses in the finished product Print image can be easily perceived by the human eye.
- the loss of quality results from the fact that with a fluctuating light intensity of the laser light, which is due to a too low or too high temperature of the respective laser diode, the pixels to be generated on the printing plate vary greatly, so that the printing image generated with the printing plate has errors which lead to the perceptible loss of quality described above.
- the temperature fluctuations of the laser diodes are generated when a printing plate is labeled, in particular in that the laser diodes convert a large part of the electrical energy supplied to them into Joule heat in the switched-on state, and in the switched-off state, i.e. in those places where no imaging takes place, no heat is generated by the laser diodes.
- this results in high quality losses, in particular in the areas of the printing plate in which only a few pixels are set by the corresponding laser diode unit, since the laser diode unit which has been switched off for a longer period of time cools down and therefore when switched on again, due to the heating of the laser diode necessary time, a lower light intensity generated.
- the object of the invention is to provide a method for regulating the temperature in a printing plate labeling unit working with laser light, with which the temperature of the laser light source generating the laser light, in particular a laser diode, can be kept constant to a high degree and with simple means can.
- the invention has the particular advantage that even with labeling units with a larger number of individual laser diode units and associated focusing optics, a high degree of constancy and, in connection therewith, high quality in the generation of the individual pixels on the printing plate can be achieved over the entire image.
- the device according to the invention has the advantage that it can be retrofitted in a simple and inexpensive manner to existing printing plate labeling units, both for flat printing plates and for printing plates clamped on a printing plate cylinder.
- the device 1 shown in FIG. 1 for labeling a printing plate 4 clamped on a printing plate cylinder 2 of a printing press has one or more, for example 16 individual printing plate labeling units 5, of which only two units are shown in FIG. 1 for reasons of illustration technology.
- the labeling units 5 can also be used for labeling flat printing plates.
- Each of the labeling units 5 comprises focusing optics 6 which are arranged in the vicinity of the printing plate 4 and which are connected to a laser diode unit 10 via an optical light guide 8.
- the optical focusing optics 6 focus the laser light generated by the laser diode unit 10 onto an image point to be generated on the printing plate 4, where it removes an area corresponding to the image point from the surface layer of the printing plate 4, so that an underlying ink-accepting layer is exposed.
- the structure and the composition of such a printing plate are known, for example, from US Pat. No. 5,351,617 and are not described further here.
- the control of the laser diode unit 10 takes place via a control device 12, which switches the laser diode unit on or off depending on a pixel to be set or not to be set in accordance with a bit pattern generated in the prepress stage.
- the laser diode units 10 are accommodated in a housing 14 which is fastened on a base or carrier body 16.
- a heating element 18, which is actuated by the control device 12, is arranged in the vicinity of the laser diode unit 10, preferably inside the housing 14.
- the heating element 18 is actuated by the control device 12 alternately or in push-pull with the laser diode unit 10 in such a way that when the laser diode unit 10 is switched off, the heating element 18 is actuated and this heats the switched off laser diode unit 10.
- the heating element 18 when the printing plate 4 is labeled with a pixel, the heating element 18 is switched off, so that no heat energy is generated by it during the time in which the laser diode unit 10 is switched on.
- the heating element 18 is formed by an ohmic resistor, which is alternately connected to the high or low electrical voltage in alternation with the laser diode unit 10.
- the heating element 18 can be formed by any other electronic component that generates Joule heat and is connected to a corresponding current and / or voltage source in opposition to the laser diode unit 10.
- a component can be, for example, a transistor, a diode or a so-called Peltier element, etc.
- the heating element 18 can also be arranged outside the housing 14, for example on this or on the base body 16.
- the base body 16 carrying the labeling unit 5 Constantly cooling or heating device 1, for example by virtue of the fact that the base body 16 is hollow on the inside and the interior is flowed through by a corresponding cooling or heat transport medium of the desired temperature, as indicated by the arrows 20, 22.
- a base body 16 through which a cooling or heating medium flows it can also be electrically heated in the same way.
- an independent pre-temperature can be imparted independently of the regulation of the temperature by the heating element 18 of the laser diode unit 10 and / or the heating element 18, so that, for example, the operating point is one of several, e.g. B. from 16 printing plate labeling units 5 printing plate labeling device 1, for example depending on the respective ambient temperature for all labeling units 5 can be changed together.
- the temperature of the laser diode unit 10 can be regulated by the heating element 18 using, for example, an electronic circuit arrangement 30 shown in FIG. 2.
- the circuit arrangement 30 has a current and / or voltage source 32, to whose one pole, for example the positive pole, the control device 12 and the heating element 18 and, in parallel, the laser diode unit 10 are connected.
- the heating element 18 and the laser diode unit 10 are also connected to the second pole of the current and / or voltage source 32 via respectively assigned power transistors 34 and 36.
- the base of the power transistor 34 of the heating element 18 is preferably connected to the control device 12 via a fixed or adjustable resistor 35.
- the base of the power transistor 36 of the laser diode unit 10 is preferably connected to the control device 12 via a second fixed or controllable resistor 37 and an inverting Schmitt trigger circuit 38.
- the control device 12 controls the bases of the Power transistors 34 and 36 in push-pull operation, so that when the laser diode unit 10 is switched off, a current flows through the heating element 18, the size of which can be set accordingly via the resistor 35 for the respective heating element 18 of a printing plate labeling unit 5. Due to the inverting Schmitt trigger 38, the signal present at the base of the power transistor 36 of the laser diode unit 10 is inverted, so that the power transistor 36 blocks and the laser diode unit 10 remains switched off.
- a signal of reversed polarity is generated by the control device 12 and, accordingly, the power transistor 34 of the heating element 18 is blocked and the power transistor 36 is switched on due to the inverting effect of the Schmitt trigger circuit 38, so that a current flows through the laser diode unit 10, whose size is adjustable via the resistor 37.
- the control device 12 generates the signals as a function of a pixel to be set on the printing plate 4.
- the course of the voltage U R applied to the heating element 18 and the voltage U LD applied to the laser diode unit 10 at the same time are shown in idealized form in FIG. 3.
- the heating element 18 is connected to the voltage source 32 during the preheating phase V or in an equivalent manner to a corresponding current source and emits a certain amount of heat Q R , the size of which is preferably regulated in this way via the adjustable resistor 35 becomes that the temperature of the laser diode unit 10 switched off at this time adjusts to a desired working temperature.
- the voltage U LD applied to the laser diode unit 10 during the preheating phase V in this embodiment of the invention is preferably 0 volts, so that the amount of heat generated by the laser diode unit 10 per unit of time is also corresponding to 0 J (joules).
- the laser diode unit 10 is switched on by applying the voltage U LD and the heating element 18 is switched off at the same time, that is to say alternately or in opposition to it.
- the amount of heat emitted by the laser diode unit 10 per unit of time Q LD and the amount of heat emitted by the heating element 18 per unit of time Q R are preferably essentially the same, depending on the arrangement of the heating element 18 or the preheating of the base body 16 or total radiated thermal power, the heat quantity Q R radiated by the heating element 18 can also be smaller or larger than the heat quantity Q LD radiated by the laser diode unit 10.
- the amounts of heat can be adjusted, for example, via the adjustable resistors 35, 37 of the circuit arrangement shown in FIG. 2, the adjustment preferably being carried out in such a way that the temperature fluctuations between switching the laser diode unit on and off are as small as possible.
- the heating element 18, as shown in FIG. 4 is supplied with a preferably adjustable basic voltage U R1 , or a corresponding basic current, even when the laser diode unit 10 is switched on, and emits a first basic heat quantity Q R1 , which is shown in the upper diagram 4 is shown as a dashed line.
- the heating element 18 is connected to a second higher voltage U R2 , as a result of which it generates the amount of heat Q R2 per unit of time.
- the difference between the amounts of heat Q R1 and Q R2 emitted by the heating element 18 in this embodiment of the invention is preferably selected such that the temperature fluctuations or the temperature difference of the Laser diode unit 10 between the off and on state is minimal.
- the heat quantities Q R1, Q R2 and Q LD as well as the corresponding voltages U R1 , U R2 and U LD , in particular the difference between Q R2 and Q R1 can also have a different value, depending on the radiation emitted to the environment Amount of heat per unit of time, the thermal conductivity of the individual components, the arrangement and design of the heating element 18, the preheating of the carrier body 16 or housing 14 etc. preferably empirically by adjusting the voltage and / or the current via the adjustable resistors 35, 37 in the manner it is determined that the temperature differences of the laser diode unit 10 become as small as possible.
- the switching on of the laser diode unit 10 and the corresponding switching off of the heating element 18 are preferably carried out simultaneously. However, it can also be provided that the periods of time in which the laser diode unit 10 is switched on and the heating element 18 is switched off overlap, so that the heating element 18 z. B. can be turned on a short time before switching off the laser diode unit 10. In the same way, the heating element 18 can then remain switched on for a short period of time beyond the time at which the laser diode unit 10 is switched on.
- the base body 16 or the laser diode units 10 and / or their housing with a layer of thermal insulation material, so that fluctuations in the ambient temperature result in less or almost none Have an influence on the temperature of the laser diode units 10.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Manufacture Or Reproduction Of Printing Formes (AREA)
- Electronic Switches (AREA)
- Exposure And Positioning Against Photoresist Photosensitive Materials (AREA)
- Laser Beam Printer (AREA)
- Semiconductor Lasers (AREA)
- Accessory Devices And Overall Control Thereof (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19617552A DE19617552A1 (de) | 1996-05-02 | 1996-05-02 | Verfahren und Vorrichtung zur Regelung der Temperatur in einer mit Laserlicht arbeitenden Druckplatten-Beschriftungseinheit, insbesondere einer Offset-Druckmaschine |
| DE19617552 | 1996-05-02 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0805021A2 true EP0805021A2 (fr) | 1997-11-05 |
| EP0805021A3 EP0805021A3 (fr) | 1998-01-07 |
| EP0805021B1 EP0805021B1 (fr) | 2000-12-27 |
Family
ID=7793075
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP97105896A Expired - Lifetime EP0805021B1 (fr) | 1996-05-02 | 1997-04-10 | Procédé pour la régulation de la température dans une machine pour l'inscription des plaques pour l'impression utilisant un rayonnement laser en particulier une machine offset |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US6043456A (fr) |
| EP (1) | EP0805021B1 (fr) |
| JP (1) | JPH1071690A (fr) |
| CA (1) | CA2201226C (fr) |
| DE (2) | DE19617552A1 (fr) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19906421B4 (de) * | 1999-02-16 | 2004-10-14 | Heidelberger Druckmaschinen Ag | Verfahren zur Verminderung von Unschärfen und zur Einstellung der optischen Auflösung eines Belichtungsgerätes |
| US6363095B1 (en) * | 1999-05-06 | 2002-03-26 | Northrop Grumman Corporation | Solid-state laser system using high-temperature semiconductor diode laser as an optical pump source |
| CA2349912A1 (fr) | 2000-07-07 | 2002-01-07 | Heidelberger Druckmaschinen Aktiengesellschaft | Composition d'une image sur une plaque d'impression a l'aide d'impulsions laser ultracourtes |
| DE10045168B4 (de) * | 2000-09-13 | 2008-07-31 | Hell Gravure Systems Gmbh & Co. Kg | Mehrstrahl-Belichtungsverfahren |
| US20030025966A1 (en) * | 2001-08-03 | 2003-02-06 | Ross Halgren | OSP hardened WDM network |
| US6765941B2 (en) * | 2001-12-03 | 2004-07-20 | Agfa Corporation | Method and apparatus for cooling a self-contained laser head |
| CA2449619A1 (fr) * | 2003-01-07 | 2004-07-07 | Heidelberger Druckmaschinen Aktiengesellschaft | Dispositif de production d'une forme d'impression |
| CN1840332A (zh) * | 2005-03-31 | 2006-10-04 | 海德堡印刷机械股份公司 | 用于在记录材料上产生图像的方法 |
| DE102005036099A1 (de) * | 2005-08-01 | 2007-02-08 | Heidelberger Druckmaschinen Ag | Vorrichtung zur Temperierung eines Lasermodus in einen Druckplattenbelichter |
| JP5626732B2 (ja) | 2011-04-06 | 2014-11-19 | 日立オムロンターミナルソリューションズ株式会社 | 紙葉類取扱装置 |
Family Cites Families (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3686543A (en) * | 1968-02-08 | 1972-08-22 | Rca Corp | Angled array semiconductor light sources |
| US4399541A (en) * | 1981-02-17 | 1983-08-16 | Northern Telecom Limited | Light emitting device package having combined heater/cooler |
| JPS5994891A (ja) * | 1982-11-24 | 1984-05-31 | Hitachi Ltd | 半導体レ−ザ装置 |
| HUT39871A (en) * | 1985-02-19 | 1986-10-29 | Videoton Elekt Vallalat | Method for measuring the temperature of semiconductor laser diode and circuit arrangement for carrying out thereof |
| JPH0821747B2 (ja) * | 1987-04-23 | 1996-03-04 | 日本電気株式会社 | 光伝送装置 |
| US4924473A (en) * | 1989-03-28 | 1990-05-08 | Raynet Corporation | Laser diode protection circuit |
| DD284784A5 (de) * | 1989-06-07 | 1990-11-21 | Veb Robotron Bueromaschinenwerk "Ernst Thaelmann" Soemmerda,Dd | Schaltungsanordnung zur regelung der temperatur von halbleiterlasern in druckern |
| DE3925201A1 (de) * | 1989-07-29 | 1991-02-07 | Messerschmitt Boelkow Blohm | Optische bank zur halterung optischer, elektrischer u.a. komponenten |
| US5105429A (en) * | 1990-07-06 | 1992-04-14 | The United States Of America As Represented By The Department Of Energy | Modular package for cooling a laser diode array |
| JP2959678B2 (ja) * | 1990-09-25 | 1999-10-06 | 富士通株式会社 | 半導体レーザモジュール及び該モジュールの製造方法 |
| US5105430A (en) * | 1991-04-09 | 1992-04-14 | The United States Of America As Represented By The United States Department Of Energy | Thin planar package for cooling an array of edge-emitting laser diodes |
| US5262658A (en) * | 1991-12-24 | 1993-11-16 | Xerox Corporation | Thermally stabilized light emitting diode structure |
| US5309458A (en) * | 1992-03-02 | 1994-05-03 | Ecrm Trust | Method and apparatus for stabilizing laser diode energy output |
| DE4212777C2 (de) * | 1992-04-16 | 1994-03-03 | Rohde & Schwarz | Laserdioden-Anordnung für Atomresonanzeinrichtungen, insbesondere für Atomfrequenznormale |
| US5351617A (en) * | 1992-07-20 | 1994-10-04 | Presstek, Inc. | Method for laser-discharge imaging a printing plate |
| US5488625A (en) * | 1992-10-07 | 1996-01-30 | Canon Kabushiki Kaisha | Semiconductor laser device having chip-mounted heating element |
| DE4235768A1 (de) * | 1992-10-24 | 1994-05-19 | Cho Ok Kyung | Modifizierte Halbleiterlaserdiode mit integriertem Temperaturregelungsteil |
| DE9302494U1 (de) * | 1993-02-20 | 1993-04-22 | Man Roland Druckmaschinen Ag, 63069 Offenbach | Anordnung zum Bebildern einer Schicht auf der Oberfläche eines Formzylinders |
| US5331652A (en) * | 1993-03-22 | 1994-07-19 | Alliedsignal Inc. | Solid state laser having closed cycle gas cooled construction |
| US5406172A (en) * | 1993-12-28 | 1995-04-11 | Honeywell Inc. | Light source intensity control device |
| US5400351A (en) * | 1994-05-09 | 1995-03-21 | Lumonics Inc. | Control of a pumping diode laser |
| JP3320900B2 (ja) * | 1994-05-19 | 2002-09-03 | 富士通株式会社 | レーザダイオードの自動温度制御回路及びこれを用いた電気／光信号変換ユニット |
| US5828683A (en) * | 1997-04-21 | 1998-10-27 | The Regents Of The University Of California | High density, optically corrected, micro-channel cooled, v-groove monolithic laser diode array |
-
1996
- 1996-05-02 DE DE19617552A patent/DE19617552A1/de not_active Withdrawn
-
1997
- 1997-03-27 CA CA002201226A patent/CA2201226C/fr not_active Expired - Fee Related
- 1997-04-10 DE DE59702800T patent/DE59702800D1/de not_active Expired - Lifetime
- 1997-04-10 EP EP97105896A patent/EP0805021B1/fr not_active Expired - Lifetime
- 1997-05-02 JP JP9114737A patent/JPH1071690A/ja active Pending
- 1997-05-02 US US08/850,228 patent/US6043456A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH1071690A (ja) | 1998-03-17 |
| DE19617552A1 (de) | 1997-11-06 |
| US6043456A (en) | 2000-03-28 |
| CA2201226C (fr) | 2000-02-01 |
| DE59702800D1 (de) | 2001-02-01 |
| CA2201226A1 (fr) | 1997-11-02 |
| EP0805021A3 (fr) | 1998-01-07 |
| EP0805021B1 (fr) | 2000-12-27 |
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