EP0805021B1 - Verfahren und Vorrichtung zur Regelung der Temperatur in einer mit Laserlicht arbeitenden Druckplatten-Beschriftungseinheit, insbesondere einer Offset-Druckmaschine - Google Patents
Verfahren und Vorrichtung zur Regelung der Temperatur in einer mit Laserlicht arbeitenden Druckplatten-Beschriftungseinheit, insbesondere einer Offset-Druckmaschine Download PDFInfo
- Publication number
- EP0805021B1 EP0805021B1 EP97105896A EP97105896A EP0805021B1 EP 0805021 B1 EP0805021 B1 EP 0805021B1 EP 97105896 A EP97105896 A EP 97105896A EP 97105896 A EP97105896 A EP 97105896A EP 0805021 B1 EP0805021 B1 EP 0805021B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- laser diode
- diode unit
- switched
- heat quantity
- heat
- 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
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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 one Offset printing machine according to the preamble of claims 1 and 8.
- the labeling units have a light source, the light of which comes from a optical lens system is focused on the respective point of the printing plate and the depending on whether an image point is generated on the printing plate at the corresponding point should be switched on or off.
- DE 36 03 548 A1 describes a method for determining and regulating the Temperature of a laser diode operated in pulse mode in a xerographic Printer in which a constant current is passed through during the exposure period of the laser radiation the diode is conducted, which is smaller than the minimum current which is used to generate the Laser radiation is needed. Depending on one with the constant current through the voltage associated with the laser diode is then controlled by the laser diode feeding current. Furthermore, a heating-cooling unit is provided, which for one for the laser diode is activated to cool the laser diode and dangerous temperature hereby set the current of the laser diode back to a basic value.
- the font gives no indication of a heat source alternating with the laser diode unit in to operate in such a way that the temperature of the laser diode unit is as constant as possible is held.
- US 5,351,617 also shows a device in which several optical focusing units that use optical Fiber optic cables to corresponding laser light sources connected, can be moved over a flat pressure plate and expose them in the appropriate places.
- the loss of quality results from the fact that at a fluctuating light intensity of the laser light leading to a low or too high temperature of the respective laser diode is due to be generated on the printing plate Pixels vary greatly, so that with the printing plate generated print image has errors related to the above perceptible loss of quality described.
- the temperature fluctuations of the laser diodes are in the Inscription of a printing plate generated in particular by that the laser diodes in the on state a large part the electrical energy supplied to them in Joule heat convert, and when switched off, i.e. to the Places where there is no imaging from the Laser diodes generate no heat.
- Step into practice hereby in particular in the areas of the pressure plate, in those of the corresponding laser diode unit only individual pixels are set, high quality losses on, because the switched off for a longer period
- the laser diode unit cools down and as a result when switching on again, due to the heating of the Laser diode necessary time, a shorter one Light intensity generated.
- the object of the invention is to solve a problem Process for regulating the temperature in a laser light creating working printing plate labeling unit, with which the temperature of the laser light generating Laser light source, especially a laser diode, in high Dimensions and can be kept constant with simple means.
- the invention has the particular advantage that even with labeling units with a larger one Number of individual laser diode units and associated ones Focusing optics a high consistency and associated with it high quality in the generation of the individual pixels on the printing plate across the entire image leaves.
- the device according to the invention has the Advantage that they are simple and inexpensive with existing printing plate labeling units, both for flat printing plates as well as for one Retrofit printing plate cylinders with mounted printing plates leaves.
- the device 1 for labeling shown in FIG. 1 one on a printing plate cylinder 2 of a printing press clamped printing plate 4 has one or more, for example 16 individual Printing plate labeling units 5, of which in Fig. 1 overall for technical reasons only two units are shown.
- Labeling units 5 also for labeling flat pressure plates can be used.
- Each of the Labeling units 5 includes a near the Pressure plate 4 arranged focusing optics 6, which an optical light guide 8 to a laser diode unit 10 connected.
- the optical focusing optics 6 focuses what is generated by the laser diode unit 10 Laser light on one to be generated on the printing plate 4 Pixel where there is an area corresponding to the pixel removed from the surface layer of the pressure plate 4, so that an underlying ink accepting layer is exposed.
- the structure and composition of a such printing plate are for example from US 5,351,617 are known and are not described further here.
- the laser diode unit 10 is controlled via a Control device 12, which the laser diode unit in Dependence on one to be set or not to be set Pixel corresponding to one generated in the prepress Turns bit pattern on or off.
- the laser diode units 10 are in one Housing 14 housed, which on a basic or Carrier body 16 is attached. Near the Laser diode unit 10, preferably within the Housing 14, a heating element 18 is arranged, which by the control device 12 is actuated. The actuation of the heating element 18 takes place through the Control device 12 alternately or in push-pull with the Laser diode unit 10 in such a way that when switched off Laser diode unit 10, the heating element 18 is actuated and this heats the switched-off laser diode unit 10. At the Turning on the laser diode unit 10, i.e.
- the heating element 18 when labeling the printing plate 4 with a pixel, that is Heating element 18 turned off, so that during the Time in which the laser diode unit 10 is switched on, no thermal energy is generated.
- the heating element 18 by an ohmic resistance which alternates with the Laser diode unit 10 corresponding to a high or a low electrical voltage is connected.
- the heating element 18 by any other Joule heat-generating electronic component is formed be that in push-pull to the laser diode unit 10 to a appropriate current and / or voltage source connected becomes.
- a component can be, for example, a transistor, a diode or a so-called Peltier element etc.
- the heating element 18 in the housing 14 of the laser diode unit 10 can also be outside the housing 14 for example on this or on the base body 16 be arranged.
- the Inscription unit 5 supporting body 16 of the To constantly cool or heat device 1 for example in that the base body 16 inside is hollow and the interior of one appropriate cooling or heat transport medium desired Temperature, as indicated by arrows 20, 22, is flowed through.
- the base body 16 inside is hollow and the interior of one appropriate cooling or heat transport medium desired Temperature, as indicated by arrows 20, 22, is flowed through.
- one from a cooling or Heat medium flowing through the base body 16 can in be heated electrically in the same way.
- the regulation of the temperature of the laser diode unit 10 by the heating element 18 can be, for example, with one in FIG. 2 Electronic circuit arrangement 30 shown be made.
- the circuit arrangement 30 has one Current and / or voltage source 32, at one pole, for example the plus 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 still above each associated power transistors 34 and 36 with the second Pol of the current and / or voltage source 32 connected.
- the Base of the power transistor 34 of the heating element 18 is preferably via a fixed or adjustable resistor 35 connected to the control device 12.
- the basis of the Power transistor 36 of the laser diode unit 10 is preferably via a second fixed or adjustable Resistor 37 and an inverting Schmitt trigger circuit 38 with the control device 12 connected.
- the control device 12 controls the bases of the Power transistors 34 and 36 in push-pull operation, so that with the laser diode unit 10 switched off, the heating element 18 a current flows through it, the size of which exceeds Resistor 35 for the respective heating element 18 Printing plate labeling unit 5 set accordingly can be.
- the inverting Schmitt trigger 38 at the base of the Power transistor 36 of the laser diode unit 10 is applied Signal inverted so that the power transistor 36 blocks and the laser diode unit 10 remains switched off.
- the Control device 12 To the Switching on the laser diode unit 10 is done by the Control device 12 a signal of reverse polarity generated and corresponding to the power transistor 34 of the Heating element 18 blocked and the power transistor 36 due to the inverting effect of the Schmitt trigger circuit 38 switched through, so that the A current flows through the laser diode unit 10, whose size is adjustable via the resistor 37.
- the Generating the signals by the control device 12 takes place depending on one to be set Pixel on the printing plate 4.
- FIG. 3 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 FIG. 3 in an idealized form.
- 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 is also corresponding to 0 J (joules) per unit time.
- 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 push-pull.
- 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 switched-off and switched-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 heating element 18 is switched off accordingly preferably at the same time.
- the heating element 18 can then be a short one Time span over the time when the Laser diode unit 10 remain switched on.
- Embodiment of the invention may also be provided the base body 16 and the Laser diode units 10 and / or their housing with a To provide a layer of thermal insulation material, so that fluctuations in ambient temperature are less or almost no influence on the temperature of the Have 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)
- Accessory Devices And Overall Control Thereof (AREA)
- Semiconductor Lasers (AREA)
Description
- Fig. 1
- eine schematische Darstellung von zwei an einem Druckplattenzylinder einer Druckmaschine angeordneten Druckplatten-Beschriftungseinheiten mit erfindungsgemäßen Temperaturregelungsvorrichtungen,
- Fig. 2
- einen elektrischen Schaltplan einer bevorzugten Ausführungsform der erfindungsgemäßen Temperatur-Regelungsvorrichtung,
- Fig. 3
- einen Verlauf der am Widerstand beziehungsweise an der Laserdiode anliegenden elektrischen Spannung beziehungsweise der vom Widerstand bzw. der Diode abgegebenen Wärmemenge bei einer ersten Ausführungsform der Erfindung, bei der die am Widerstand anliegende Spannung bei Einschalten der Laserdiode auf Null heruntergefahren wird,
- Fig. 4
- eine weitere Ausführungsform der Erfindung, bei der am Heizelement bei ausgeschalteter Laserdiodeneinheit eine bestimmte Wärmemenge erzeugt wird, die nach Einschalten der Laserdiodeneinheit um eine vorherbestimmten Wert verringert wird.
- 1
- Druckplatten-Beschriftungsvorrichtung
- 2
- Druckmaschinenzylinder
- 4
- Druckplatte
- 5
- Druckplatten-Beschriftungseinheit
- 6
- optische Fokussierungseinrichtung
- 8
- optische Lichtleiter
- 10
- Laserdiodeneinheit
- 12
- Steuereinrichtung
- 14
- Gehäuse
- 16
- Tragekörper
- 18
- Heizelement
- 20
- Pfeil
- 22
- Pfeil
- 30
- Schaltungsanordnung
- 32
- Strom/Spannungsquelle
- 34
- Leistungstransistor für Heizelement
- 35
- regelbarer Widerstand für Heizelement
- 36
- Leistungstransistor für Laserdiodeneinheit
- 37
- regelbarer Widerstand für Laserdiodeneinheit
- 38
- invertierende Schmitt-Triggerschaltung
- V
- Vorwärmphase
- B
- Beschriftungsphase
Claims (13)
- Verfahren zur Regelung der Temperatur in einer mit Laserlicht arbeitenden Druckplatten-Beschriftungseinheit einer Druckmaschine, insbesondere einer Offset-Druckmaschine, wobei das Laserlicht durch eine Laserdiodeneinheit erzeugt wird, die in Abhängigkeit von dem auf der Druckplatte zu erzeugenden Bildmuster ein- und ausgeschaltet wird,
dadurch gekennzeichnet,
daß eine in der Nähe der Laserdiodeneinheit angeordnete Wärmequelle im Wechsel mit der Laserdiodeneinheit in der Weise betrieben wird, daß die Temperatur der Laserdiodeneinheit möglichst konstant ist. - Verfahren nach Anspruch 1,
dadurch gekennzeichnet,
daß die pro Zeiteinheit von der Wärmequelle abgegebene Wärmemenge bei ausgeschalteter Laserdiodeneinheit erhöht und bei eingeschalteter Laserdiodeneinheit verringert wird. - Verfahren nach Anspruch 1 oder 2,
dadurch gekennzeichnet,
daß die von der Wärmequelle pro Zeiteinheit abgegebene Wärmemenge im wesentlichen der von der Laserdiodeneinheit pro Zeiteinheit abgegebenen Wärmemenge entspricht. - Verfahren nach Anspruch 1 oder 2,
dadurch gekennzeichnet,
daß die Wärmequelle bei eingeschalteter Laserdiodeneinheit eine vorgegebene Grundwärmemenge pro Zeiteinheit abgibt, die kleiner als die von der Laserdiodeneinheit abgegebene Wärmemenge pro Zeiteinheit ist und daß die Wärmequelle bei ausgeschalteter Laserdiodeneinheit eine zweite größere Wärmemenge abgibt, wobei die ersten und zweiten Wärmemengen in der Weise gewählt sind, daß die Temperaturdifferenz der Laserdiodeneinheit zwischen ein- und ausgeschaltetem Zustand mimimal wird. - Verfahren nach Anspruch 4,
dadurch gekennzeichnet,
daß die Differenz zwischen der ersten und der zweiten Wärmemenge im wesentlichen der Differenz zwischen der von der eingeschalteten Laserdiodeneinheit abgegebenen Wärmemenge und der zweiten Wärmemenge entspricht. - Verfahren nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet,
daß die Laserdiodeneinheit und/oder die Wärmequelle auf eine vorbestimmte Vortemperatur erwärmt oder gekühlt werden. - Verfahren nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet,
daß die Laserdiodeneinheiten und/oder die Wärmequellen gegenüber der Umgebung thermisch isolliert sind. - Vorrichtung zur Regelung der Temperatur in einer mit Laserlicht arbeitenden Druckplatten-Beschriftungseinheit einer Druckmaschine, insbesondere einer Offset-Druckmaschine, in der das Laserlicht durch mindestens eine Laserdiodeneinheit erzeugt wird, die in Abhängigkeit von dem auf der Druckplatte zu erzeugenden Punktmuster ein- und ausgeschaltet wird,
dadurch gekennzeichnet,
daß in der Umgebung der Laserdiodeneinheit (10) ein elektrisches Heizelement (18) angeordnet ist, das im Wechsel mit der Laserdiodeneinheit 10 bei eingeschalteter Laserdiodeneinheit (10) eine erste Wärmemenge (QR1) und bei ausgeschalteter Laserdiodeneinheit (10) eine zweite, größere Wärmemenge (QR2) erzeugt. - Vorrichtung nach Anspruch 8,
dadurch gekennzeichnet,
daß die zweite Wärmemenge (QR2) im wesentlichen der von Laserdiodeneinheit (10) erzeugten Wärmemenge (QLD) entspricht und daß die erste, kleinere Wärmemenge (QR1) einen Wert von 0 besitzt. - Vorrichtung nach Anspruch 8,
dadurch gekennzeichnet,
daß die vom Heizelement (18) bei ausgeschalteter Laserdiodeneinheiten (10) erzeugte zweite Wärmemenge (QR2) eine solche Größe besitzt, daß die Temperatur der Laserdiodeneinheit (10) einem vorherbestimmten Soll-Wert entspricht. - Vorrichtung nach Anspruch 10,
dadurch gekennzeichnet,
daß die vom Heizelement (18) bei eingeschalteter Laserdiodeneinheit (10) erzeugte erste Wärmemenge (QR1) einen Wert besitzt, dessen Größe der zweiten Wärmemenge (QR2) vermindert um die Differenz aus der von der Laserdiodeneinheit (10) erzeugten Wärmemenge (QLD) und der zweiten Wärmemenge (QR2) entspricht. - Vorrichtung nach einem der Ansprüche 8 bis 11,
dadurch gekennzeichnet,
daß das Heizelement (18) durch ein Joulsche Wärme erzeugendes elektrisches Bauelement gebildet wird, das entsprechend der zu erzeugenden Wärmemenge an eine elektrische Spannungs- und/oder Stromquelle (32) angeschlossen wird. - Vorrichtung nach Anspruch 12,
dadurch gekennzeichnet,
daß eine elektronische Gegentaktschaltung (30) mit einem durch die Steuerungseinrichtung (12) gesteuerten, den Stromfluß durch das Heizelement (18) bestimmenden ersten Leistungstransistor (34) sowie einem von der Steuerungseinrichtung (12) über eine invertierende Schmitt-Triggerschaltung (38) gesteuerten, den Strom durch die Laserdiodeneinheit (10) bestimmenden zweiten Leistungstransistor (36) vorgesehen ist.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19617552 | 1996-05-02 | ||
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 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0805021A2 EP0805021A2 (de) | 1997-11-05 |
EP0805021A3 EP0805021A3 (de) | 1998-01-07 |
EP0805021B1 true EP0805021B1 (de) | 2000-12-27 |
Family
ID=7793075
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97105896A Expired - Lifetime EP0805021B1 (de) | 1996-05-02 | 1997-04-10 | Verfahren und Vorrichtung zur Regelung der Temperatur in einer mit Laserlicht arbeitenden Druckplatten-Beschriftungseinheit, insbesondere einer Offset-Druckmaschine |
Country Status (5)
Country | Link |
---|---|
US (1) | US6043456A (de) |
EP (1) | EP0805021B1 (de) |
JP (1) | JPH1071690A (de) |
CA (1) | CA2201226C (de) |
DE (2) | DE19617552A1 (de) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
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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 (en) | 2000-07-07 | 2002-01-07 | Heidelberger Druckmaschinen Aktiengesellschaft | Setting an image on a printing plate using ultrashort laser pulses |
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 (en) * | 2003-01-07 | 2004-07-07 | Heidelberger Druckmaschinen Aktiengesellschaft | Apparatus for producing a printing form |
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 |
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-
1996
- 1996-05-02 DE DE19617552A patent/DE19617552A1/de not_active Withdrawn
-
1997
- 1997-03-27 CA CA002201226A patent/CA2201226C/en not_active Expired - Fee Related
- 1997-04-10 EP EP97105896A patent/EP0805021B1/de not_active Expired - Lifetime
- 1997-04-10 DE DE59702800T patent/DE59702800D1/de 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 |
---|---|
EP0805021A2 (de) | 1997-11-05 |
CA2201226A1 (en) | 1997-11-02 |
EP0805021A3 (de) | 1998-01-07 |
CA2201226C (en) | 2000-02-01 |
US6043456A (en) | 2000-03-28 |
DE19617552A1 (de) | 1997-11-06 |
DE59702800D1 (de) | 2001-02-01 |
JPH1071690A (ja) | 1998-03-17 |
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