EP1693197B1 - Laser imager for imaging a screen in a screen holder - Google Patents

Laser imager for imaging a screen in a screen holder Download PDF

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Publication number
EP1693197B1
EP1693197B1 EP06003425A EP06003425A EP1693197B1 EP 1693197 B1 EP1693197 B1 EP 1693197B1 EP 06003425 A EP06003425 A EP 06003425A EP 06003425 A EP06003425 A EP 06003425A EP 1693197 B1 EP1693197 B1 EP 1693197B1
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EP
European Patent Office
Prior art keywords
screen
positioning
laser exposure
support
frame
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EP06003425A
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German (de)
French (fr)
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EP1693197A3 (en
EP1693197A2 (en
Inventor
Josef Lindthaler
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Individual
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F15/00—Screen printers
    • B41F15/14—Details
    • B41F15/34—Screens, Frames; Holders therefor
    • B41F15/36—Screens, Frames; Holders therefor flat
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00—Forme preparation
    • B41C1/14—Forme preparation for stencil-printing or silk-screen printing
    • B41C1/145—Forme preparation for stencil-printing or silk-screen printing by perforation using an energetic radiation beam, e.g. a laser

Definitions

  • the present invention relates to a laser exposure according to the preamble of claim 1.
  • screen printing as it is for example from the EP 0 985 526 A1 is known, the photosensitive screens are exposed by means of laser exposure with a certain subject and then coated with an emulsion that adheres only to the designated places. At the other points of the screen, where no emulsion remains, then the desired color can later pass through the sieve and reach the element to be printed.
  • a laser is focused on the screen via an appropriate optics, in order to be able to image the motif on the screen. To create a sharp image on the screen, it is important that the screen is actually placed in the focus of the laser. Even a deviation of the sieve from the focus of a tenth of a millimeter can lead to a blurred image.
  • the present invention the object of the invention to provide a laser imager of the type mentioned, with which the sieve and the frame can be automatically guided to the laser imager and is still held in a precisely defined position.
  • a laser imager according to the features of claim 1 is proposed according to the invention. Advantageous developments of this laser exposure can be found in the dependent claims.
  • a designed according to this technical teaching laser exposure has the advantage that the weight of the frame the screen during the laser exposure kept under tension and thus the screen at the crucial time, in a defined position.
  • This position of the screen can be determined to a tenth of a millimeter, so that the screen is always located in the focus of the laser, resulting in a precise exposure and thus a sharp image.
  • Another advantage is that the screen now no longer rests with the frame, but with the screen itself, so that the distance from the laser imager to the screen is always well defined.
  • the differently thick frames have no influence on the actual position of the sieve, because they now float freely next to the sieve support.
  • this surface is preferably formed parallel to the plane of the frame. This ensures that the screen is stretched at least in the field of Nutzbelichtung areal and can be fed to a defined position.
  • positioning pins and positioning holes has the advantage that the sieve steadily occupies a well-defined position in the system and relative to the laser imager, so that the resulting from the exposure motif is found in a well-defined place before. This facilitates the machine positioning of the finished exposed screen in the later screen printing, as can be dispensed with a calibration of the screen.
  • Another advantage is that the positioning pins fix the frame undamaged on the screen holder, so that when moving the screen holder under the laser exposure or out of this slipping of the screen is reliably avoided.
  • Yet another advantage of the laser imager is that the screen and frame are brought into their final position by placing them on the screen holder.
  • the frame is precisely placed and held by the positioning pins, while the screen is stretched by the weight of the frame. Consequently, the sieve can be mechanically placed on the sieve holder, resulting in a cost reduction.
  • a positioning opening as a slot and to maintain the other positioning hole as a circular hole. This ensures that over the circular positioning an exact positioning of the screen is ensured that over the second positioning pin slipping or twisting of the screen is reliably achieved, and that but over the slot tilting of the frame when placing the screen in the screen holder or when removing the screen from the screen holder is avoided.
  • Another advantage is that such trained as a sieve screen straining device is very inexpensive to produce, since this is very simple design and has no moving parts.
  • the screen support is formed as a peripheral, upwardly projecting web, wherein on the web a flat support surface is formed.
  • the screen support is formed from at least four upwardly projecting punches, wherein each punch has a flat support surface and wherein the support surface and the punch are aligned.
  • stamp support formed by stamp is inexpensive to manufacture and also biases the screen in the manner described above.
  • FIG. 1 is shown in perspective view a part of a laser exposure device according to the invention.
  • This laser imager comprises a linearly movable screen holder 10, which is held linearly movable in a corresponding guide track 12.
  • the screen holder 10 comprises a substantially horizontally oriented table 14, at the edge of two vertically projecting positioning pins 16, 18 are attached.
  • a circumferential and upwardly projecting web 20 is provided on the table 14, on the upper side of which a screen support 22 is formed.
  • the upper side of the web 20 is formed as a flat bearing surface on which a sieve 24 can be placed.
  • the screen holder 10 can be driven by the process along the guideway 12 under the laser so that the sieve resting on the sieve 22 24 is positioned exactly in the focus of the laser.
  • the screen 24 required for the screen printing is held in a generally known manner in a frame 28 under a certain bias.
  • the frame 28 are at a defined location two positioning holes 30, 32 provided, in which later the positioning pins 16, 18 engage.
  • the sieve 24, together with the frame 28 is placed on the sieve support 10 pulled forward along the guideway 12.
  • the frame 28 is positioned so that the positioning pins 16, 18 pass through the positioning holes 30, 32, so that the frame 28 is positioned at a defined location of the screen holder 10.
  • Fig. 3 can be seen in detail, while hanging the frame 28 free-floating in the air and while only the sieve 24 rests on the sieve support 22. Due to the weight of the usually made of metal frame 28 while the screen 24 is held on the screen support 22 and even stretched a bit. After the position of the screen support 22 is exactly known, the position of the screen 24 now placed directly on the screen support 22 is also known exactly, so that the position of the screen 24 is exactly known when the screen support 10 is inserted along the guide track 12 under the box 26 with the result that the laser can be correspondingly precisely focused to project a sharp image on the screen 24.
  • the wire holder 10 After the wire 24 has been correspondingly laser-exposed, the wire holder 10 only needs to be pulled forward along the guide track 12 before the wire is removed from the wire support 22 for further processing.
  • the screen support instead of the circumferential web can also be formed by a number, preferably four, stamp, which also have a flat support surface on its front side.
  • the screen can also be arranged vertically and, for example, moved by means of a carriage in the focus of the laser exposure.
  • the screen can be biased by appropriately movable punch or by a corresponding movable peripheral web. The stamp or thereby the web is moved horizontally and moved up to the sieve surface to the screen until the screen is stretched accordingly. Then, based on the position of the bearing surfaces of the punch or the webs, the exact position of the screen can be determined, so that the laser can be focused on this position.
  • a first positioning hole 30 ' is formed circular in the screen 24', while the second positioning hole 32 'is formed as a slot.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Optics & Photonics (AREA)
  • Toxicology (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
  • Laser Beam Processing (AREA)
  • Projection-Type Copiers In General (AREA)

Abstract

Laser exposure system has exposure unit and screen holder (10) for the defined positioning of screen (24) to be exposed. The screen holder comprises of screen support (22) with the defined support surface, whereby the screen support is arranged in such a manner that the screen is laid on the screen support, while the framework (28) is freely suspended adjacent to the screen support from the screen. A positioning stud (16,18) is attached on the screen holder, which intervenes into a position opening (30, 32) provided at the framework, as long as the screen rest upon the screen support.

Description

Die vorliegende Erfindung betrifft einen Laserbelichter gemäß dem Oberbegriff des Anspruches 1. Beim Siebdruck wie es beispielsweise aus der EP 0 985 526 A1 bekannt ist, werden die lichtempfindlichen Siebe mittels Laserbelichtung mit einem bestimmten Motiv belichtet und anschließend mit einer Emulsion beschichtet, die lediglich an den dafür vorgesehenen Stellen haften bleibt. An den anderen Stellen des Siebes, an denen keine Emulsion verbleibt, kann dann später die gewünschte Farbe durch das Sieb hindurchtreten und auf das zu druckende Element gelangen. Im Rahmen der Laserbelichtung wird ein Laser über eine entsprechende Optik auf das Sieb fokussiert, um das Motiv auf dem Sieb abbilden zu können. Damit auf dem Sieb ein scharfes Bild entsteht ist es wichtig, dass das Sieb auch tatsächlich im Fokus des Laser platziert ist. Dabei kann schon eine Abweichung des Siebes aus dem Fokus von einem Zehntelmillimeter zu einem unscharfen Bild führen.The present invention relates to a laser exposure according to the preamble of claim 1. In screen printing as it is for example from the EP 0 985 526 A1 is known, the photosensitive screens are exposed by means of laser exposure with a certain subject and then coated with an emulsion that adheres only to the designated places. At the other points of the screen, where no emulsion remains, then the desired color can later pass through the sieve and reach the element to be printed. As part of the laser exposure, a laser is focused on the screen via an appropriate optics, in order to be able to image the motif on the screen. To create a sharp image on the screen, it is important that the screen is actually placed in the focus of the laser. Even a deviation of the sieve from the focus of a tenth of a millimeter can lead to a blurred image.

Bei Tintenstrahldruckern oder bei Wachsbeschichtungsverfahren ist es insbesondere aus der EP 0 811 484 A1 bekannt, das Sieb auf einen Support auf zu legen, wobei der das Sieb haltende Rahmen neben dem Support schwebt. Hierdurch wird das Sieb in Z-Richtung exakt positioniert. Eine Positionierung in XY-Richtung erfolgt durch einen winkeligen Anschlag, an den das Sieb nebst Rahmen geschoben wird. Eine solche Positionierung ist für eine automatisierte Siebdruckanlage ungeeignet, da beim Verfahren des Tisches unter den Laserbelichter das Sieb verrutschen kann.In ink jet printers or in wax coating processes, it is in particular from EP 0 811 484 A1 it is known to place the screen on a support, with the frame holding the screen floating next to the support. As a result, the screen is positioned exactly in the Z direction. Positioning in the XY direction takes place by means of an angular stop on which the sieve and the frame are pushed. Such a positioning is unsuitable for an automated screen printing machine, since the screen can slip during the process of the table under the laser imager.

Aus der WO 01/70503 A1 ist es bekannt, beim Siebdruck das Sieb auf eine aus Honigwaben gebildete, hochpräzise Stützplatte aufzulegen und den Rahmen mittels mehrerer pneumatischer Mikrozylinder derart auf die Stützplatte auf zu drücken, dass das Sieb großflächig auf der Stützplatte aufliegt. Am Rahmen sind zwei Vorsprünge angeformt, in denen je eine kreisrunde Positionieröffnung vorgesehen ist, in je ein Positionierstift eingreifen kann. Dabei sind die Positionierstifte auf Schlitten gehalten, um den Positionierstift für jeden Rahmen in die gewünschte Position zu bringen. Das Einlegen des Siebes erfolgt manuell, da nur so der Schlitten mit den Positionierstiften zugeführt werden kann und die Mikrozylinder am Rahmen angreifen könnenFrom the WO 01/70503 A1 It is known to hang up the screen on a high-precision support plate formed from honeycombs in screen printing and press the frame by means of several pneumatic microcylinders on the support plate on that the screen rests on a large area on the support plate. On the frame two projections are formed, in each of which a circular positioning hole is provided, each can engage in a positioning. The positioning pins are held on slides to bring the positioning pin for each frame in the desired position. The sieve is inserted manually, as this is the only way to feed the carriage with the positioning pins and to allow the microcylinders to engage the frame

Davon ausgehend liegt der vorliegenden Erfindung die Aufgabe zu Grunde, einen Laserbelichter der eingangs genannten Art zu schaffen, mit dem das Sieb und der Rahmen automatisiert dem Laserbelichter zu geführt werden kann und dennoch in einer präzise definierten Position gehalten wird. Als technische Lösung dieser Aufgabe wird erfindungsgemäß ein Laserbelichter gemäß den Merkmalen des Anspruches 1 vorgeschlagen. Vorteilhafte Weiterbildungen dieses Laserbelichters sind den Unteransprüchen zu entnehmen.On this basis, the present invention, the object of the invention to provide a laser imager of the type mentioned, with which the sieve and the frame can be automatically guided to the laser imager and is still held in a precisely defined position. As a technical solution to this problem, a laser imager according to the features of claim 1 is proposed according to the invention. Advantageous developments of this laser exposure can be found in the dependent claims.

Ein nach dieser technischen Lehre ausgeführter Laserbelichter hat den Vorteil, dass das Eigengewicht des Rahmens das Sieb während der Laserbelichtung unter Spannung hält und somit das Sieb zur entscheidenden Zeit, in einer definierten Position ist. Diese Position des Siebes kann auf ein Zehntelmillimeter genau bestimmt werden, so dass das Sieb stets im Fokus des Lasers angeordnet ist, was zu einer präzisen Belichtung und somit zu einem scharfen Abbild führt.A designed according to this technical teaching laser exposure has the advantage that the weight of the frame the screen during the laser exposure kept under tension and thus the screen at the crucial time, in a defined position. This position of the screen can be determined to a tenth of a millimeter, so that the screen is always located in the focus of the laser, resulting in a precise exposure and thus a sharp image.

Ein weiterer Vorteil besteht darin, dass das Sieb nun nicht mehr mit dem Rahmen aufliegt, sondern mit dem Sieb selbst, so dass der Abstand vom Laserbelichter zum Sieb stets genau definiert ist. Die unterschiedlich dicken Rahmen haben keinen Einfluss auf die tatsächliche Position des Siebes mehr, denn sie schweben nun frei neben der Siebauflage.Another advantage is that the screen now no longer rests with the frame, but with the screen itself, so that the distance from the laser imager to the screen is always well defined. The differently thick frames have no influence on the actual position of the sieve, because they now float freely next to the sieve support.

Dabei hat es sich als vorteilhaft erwiesen, das Sieb quer zur Siebfläche gegen den Rahmen zu verspannen. Hierbei wird das Sieb, wie gewohnt, im Rahmen gehalten und durch Aufbringen einer Kraft quer zur Siebfläche gespannt. Dabei drückt diese Kraft das Sieb entsprechend dem vorhandenen Schlag bzw. entsprechend dem vorhandenen Spiel aus der eigentlichen Ebene des Rahmens heraus, und zwar so lange, bis das Sieb ausreichend gespannt ist. Es versteht sich, dass mit geeigneten Mitteln diese Position erfasst werden kann, um das nunmehr den Fokus des Lasers in die Ebene des gespannten Siebes zu bringen.It has proven to be advantageous to clamp the screen transversely to the screen surface against the frame. Here, the screen, as usual, held in the frame and stretched by applying a force across the screen surface. In this case, this force pushes out the sieve according to the existing impact or according to the existing game from the actual level of the frame, and that until the strainer is sufficiently stretched. It is understood that this position can be detected by suitable means in order to bring the now the focus of the laser in the plane of the strained screen.

Es ist vorteilhaft, das Sieb an mehreren Stellen anzugreifen, damit das Sieb an diesen Stellen flächenhaft zu spannen, wobei diese Fläche vorzugsweise parallel zur Ebene des Rahmens ausgebildet ist. Hierdurch wird gewährleistet, dass das Sieb zumindest im Bereich der Nutzbelichtung flächenhaft gespannt ist und einer definierten Position zugeführt werden kann.It is advantageous to attack the sieve at several points, so as to stretch the sieve at these sites areally, this surface is preferably formed parallel to the plane of the frame. This ensures that the screen is stretched at least in the field of Nutzbelichtung areal and can be fed to a defined position.

Der Einsatz von Positionierstiften und Positionieröffnungen hat den Vorteil, dass das Sieb stetes eine genau definierte Lage in der Anlage und relativ zum Laserbelichter einnimmt, so dass das durch die Belichtung entstehende Motiv an einer genau definierten Stelle vor zu finden ist. Dies erleichtert die maschinelle Positionierung des fertig belichteten Siebes beim späteren Siebdruck, da auf ein Einmessen des Siebes verzichtet werden kann.The use of positioning pins and positioning holes has the advantage that the sieve steadily occupies a well-defined position in the system and relative to the laser imager, so that the resulting from the exposure motif is found in a well-defined place before. This facilitates the machine positioning of the finished exposed screen in the later screen printing, as can be dispensed with a calibration of the screen.

Ein weiterer Vorteil besteht darin, dass die Positionierstifte den Rahmen unverrutschbar an der Siebhalterung fixieren, so dass beim Verfahren der Siebhalterung unter den Laserbelichter oder aus diesem heraus ein Verrutschen des Siebes zuverlässig vermieden wird.Another advantage is that the positioning pins fix the frame undamaged on the screen holder, so that when moving the screen holder under the laser exposure or out of this slipping of the screen is reliably avoided.

Noch ein weiterer Vorteil des Laserbelichters besteht darin, dass das Sieb samt Rahmen durch Auflegen auf die Siebhalterung in die endgültige Position gebracht wird. Dabei wird der Rahmen durch die Positionierstifte exakt platziert und gehalten, während das Sieb durch das Eigengewicht des Rahmens gespannt wird. Folglich kann das Sieb maschinell auf die Siebhalterung aufgelegt werden, was zu einer Kostensenkung führt.Yet another advantage of the laser imager is that the screen and frame are brought into their final position by placing them on the screen holder. The frame is precisely placed and held by the positioning pins, while the screen is stretched by the weight of the frame. Consequently, the sieve can be mechanically placed on the sieve holder, resulting in a cost reduction.

Dabei hat es sich als Vorteilhaft erwiesen, die Positionieröffnungen korrespondierend, passgenau und spielfrei zu den Positionierstiften auszubilden, damit eine exakte Positionierung des Siebes erreicht wird.It has proved to be advantageous to form the positioning corresponding, accurate fit and backlash to the positioning pins, so that an exact positioning of the screen is achieved.

In einer anderen, bevorzugten Ausführungsform hat es sich als vorteilhaft erwiesen, eine Positionieröffnung als Langloch auszubilden und die andere Positionieröffnung als Kreisrundes Loch beizubehalten. Hierdurch wird erreicht, dass über die kreisrunde Positionieröffnung eine exakte Positionierung des Siebes gewährleistet wird, dass über den zweiten Positionierstift ein verrutschen oder verdrehen des Siebes zuverlässig erreicht wird, und dass aber über das Langloch ein Verkanten des Rahmens beim Ablegen des Siebes in der Siebhalterung oder beim Holen des Siebes von der Siebhalterung vermieden wird.In another preferred embodiment, it has proved to be advantageous to form a positioning opening as a slot and to maintain the other positioning hole as a circular hole. This ensures that over the circular positioning an exact positioning of the screen is ensured that over the second positioning pin slipping or twisting of the screen is reliably achieved, and that but over the slot tilting of the frame when placing the screen in the screen holder or when removing the screen from the screen holder is avoided.

Ein weiterer Vorteil besteht darin, dass eine solche als Siebauflage ausgebildete Siebspannvorrichtung sehr kostengünstig herstellbar ist, da dieses konstruktiv sehr einfach ist und über keine beweglichen Teile verfügt.Another advantage is that such trained as a sieve screen straining device is very inexpensive to produce, since this is very simple design and has no moving parts.

In einer bevorzugten Ausführungsform hat es sich als vorteilhaft erwiesen, die Siebauflage als umlaufenden, nach oben abstehenden Steg auszubilden, wobei auf dem Steg eine plane Auflagefläche ausgebildet ist. Dies hat den Vorteil, dass durch einen solchen Steg eine großflächige Auflage für das Sieb vorgehalten wird, so dass die Flächenpressung im Einzelnen niedrig bleibt, so dass das Sieb nicht beschädigt wird. In einer alternativen Ausführungsform ist die Siebauflage aus mindestens vier nach oben ragenden Stempeln gebildet, wobei jeder Stempel eine plane Auflagefläche aufweist und wobei die Auflagefläche und der Stempel miteinander fluchten. Eine solche durch Stempel ausgebildete Siebauflage ist kostengünstig in der Herstellung und spannt das Sieb ebenfalls in der oben beschriebenen Weise.In a preferred embodiment, it has proved to be advantageous to form the screen support as a peripheral, upwardly projecting web, wherein on the web a flat support surface is formed. This has the advantage that such a web a large-scale support for the screen is kept, so that the surface pressure remains low in detail, so that the screen is not damaged. In an alternative embodiment, the screen support is formed from at least four upwardly projecting punches, wherein each punch has a flat support surface and wherein the support surface and the punch are aligned. Such a stamp support formed by stamp is inexpensive to manufacture and also biases the screen in the manner described above.

Dabei hat es sich als vorteilhaft erwiesen, die Siebauflage am Rand des Siebes, jedoch nicht im Bereich des Rahmens anzuordnen, damit das Sieb zwar gespannt, aber die zu belichtende Fläche dennoch vergleichsweise groß gehalten werden kann.It has proven to be advantageous to arrange the screen support at the edge of the screen, but not in the frame, so that the screen while tense, but the area to be exposed can still be kept comparatively large.

Weitere Vorteile des erfindungsgemäßen Laserbelichters ergeben sich aus der beigefügten Zeichnung und den nachstehend beschriebenen Ausführungsformen. Ebenso können die vorstehend genannten und die noch weiter ausgeführten Merkmale erfindungsgemäß jeweils einzeln oder in beliebigen Kombinationen miteinander verwendet werden. Die erwähnten Ausführungsformen sind nicht als abschließende Aufzählung zu verstehen, sondern haben vielmehr beispielhaften Charakter. Es zeigen:

Fig. 1
eine perspektivische Teilansicht eines erfindungsgemäßen Laserbelichters mit einem in einem Rahmen gehaltenen Sieb;
Fig. 2
eine Seitenansicht des Laserbelichters gemäß Fig. 1 zu einem ersten Zeitpunkt;
Fig. 3
eine Seitenansicht des Laserbelichters gemäß Fig. 1 zu einem zweiten Zeitpunkt;
Fig. 4
eine Draufsicht auf eine Siebhalterung des Laserbelichters gemäß Fig. 1, mit einem aufgelegten Sieb;
Fig. 5
eine Seitenansicht des Laserbelichters gemäß Fig. 1 zu einem dritten Zeitpunkt;
Fig. 6
eine Ausschnittsvergrößerung des Laserbelichters gemäß Fig. 1, entsprechend einer Linie VI in Fig. 5;
Fig. 7
eine Draufsicht auf eine zweite Ausführungsform eines erfindungsgemäßen Siebes.
Further advantages of the laser exposure apparatus according to the invention will become apparent from the accompanying drawings and the embodiments described below. Likewise, according to the invention, the above-mentioned features and those which are still further developed can be used individually or in any desired combinations with one another. The mentioned embodiments are not to be understood as an exhaustive list, but rather have exemplary character. Show it:
Fig. 1
a partial perspective view of a laser imager according to the invention with a screen held in a frame;
Fig. 2
a side view of the laser imager according to Fig. 1 at a first time;
Fig. 3
a side view of the laser imager according to Fig. 1 at a second time;
Fig. 4
a plan view of a screen holder of the laser imager according to Fig. 1 with an opened sieve;
Fig. 5
a side view of the laser imager according to Fig. 1 at a third time;
Fig. 6
an enlarged detail of the laser imager according to Fig. 1 , according to a line VI in Fig. 5 ;
Fig. 7
a plan view of a second embodiment of a sieve according to the invention.

In Figur 1 ist in perspektivischer Ansicht ein Teil eines erfindungsgemäßen Laserbelichters dargestellt. Dieser Laserbelichter umfasst eine linear verfahrbare Siebhalterung 10, die in einer entsprechenden Führungsbahn 12 linear verfahrbar gehalten ist. Die Siebhalterung 10 umfasst einen im Wesentlichen waagerecht ausgerichteten Tisch 14, an dessen Rand zwei senkrecht abstehende Positionierstifte 16, 18 angebracht sind. Darüber hinaus ist auf dem Tisch 14 ein umlaufender und nach oben abstehender Steg 20 vorgesehen, an dessen Oberseite eine Siebauflage 22 ausgebildet ist. Dabei ist die Oberseite des Steges 20 als eine plane Auflagefläche ausgebildet, auf die ein Sieb 24 auflegbar ist.In FIG. 1 is shown in perspective view a part of a laser exposure device according to the invention. This laser imager comprises a linearly movable screen holder 10, which is held linearly movable in a corresponding guide track 12. The screen holder 10 comprises a substantially horizontally oriented table 14, at the edge of two vertically projecting positioning pins 16, 18 are attached. In addition, a circumferential and upwardly projecting web 20 is provided on the table 14, on the upper side of which a screen support 22 is formed. In this case, the upper side of the web 20 is formed as a flat bearing surface on which a sieve 24 can be placed.

In einem hier nur angedeuteten Kasten 26 des Laserbelichters ist der eigentliche Laser untergebracht, wobei die Siebhalterung 10 durch Verfahren entlang der Führungsbahn 12 derart unter den Laser gefahren werden kann, dass das auf der Siebauflage 22 aufliegende Sieb 24 exakt im Fokus des Lasers positioniert ist.In a here indicated only box 26 of the laser imager, the actual laser is housed, the screen holder 10 can be driven by the process along the guideway 12 under the laser so that the sieve resting on the sieve 22 24 is positioned exactly in the focus of the laser.

Nachfolgend wird das Auflegen bzw. Spannen des Siebes 24 im Einzelnen wie folgt geschildert:The laying on or tensioning of the sieve 24 is described in detail as follows:

Das für den Siebdruck benötigte Sieb 24 ist in allgemein bekannter Weise in einem Rahmen 28 unter einer gewissen Vorspannung gehalten. In dem Rahmen 28 sind an einer definierten Stelle zwei Positionieröffnungen 30, 32 vorgesehen, in die später die Positionierstifte 16, 18 eingreifen werden. Zum Laserbelichten eines derart vorbereiteten Siebes 24 wird das Sieb 24 samt dem Rahmen 28 auf die entlang der Führungsbahn 12 nach vorne gezogene Siebauflage 10 aufgelegt. Wie den Figuren 2 bis 6 zu entnehmen ist, wird dabei das Sieb 24 auf den umlaufenden Steg 20 derart aufgelegt, dass das Sieb 24 direkt auf der Siebauflage 22 zur Anlage kommt, während der Rahmen 28 vom Sieb 24 gehalten frei in der Luft schwebt. Gleichzeitig wird der Rahmen 28 so positioniert, dass die Positionierstifte 16, 18 durch die Positionieröffnungen 30, 32 hindurchreichen, so dass der Rahmen 28 an einer definierten Stelle der Siebhalterung 10 positioniert ist.The screen 24 required for the screen printing is held in a generally known manner in a frame 28 under a certain bias. In the frame 28 are at a defined location two positioning holes 30, 32 provided, in which later the positioning pins 16, 18 engage. For laser exposure of a sieve 24 prepared in this way, the sieve 24, together with the frame 28, is placed on the sieve support 10 pulled forward along the guideway 12. Like that FIGS. 2 to 6 can be seen, while the screen 24 is placed on the circumferential ridge 20 so that the screen 24 is directly on the screen support 22 to the plant, while the frame 28 suspended from the screen 24 suspended in the air. Simultaneously, the frame 28 is positioned so that the positioning pins 16, 18 pass through the positioning holes 30, 32, so that the frame 28 is positioned at a defined location of the screen holder 10.

Wie Fig. 3 im Detail zu entnehmen ist, hängt dabei der Rahmen 28 freischwebend in der Luft und während lediglich das Sieb 24 auf der Siebauflage 22 aufliegt. Durch das Eigengewicht des in der Regel aus Metall bestehenden Rahmens 28 wird dabei das Sieb 24 auf der Siebauflage 22 gehalten und sogar ein bisschen gespannt. Nachdem die Position der Siebauflage 22 exakt vorbekannt ist, ist auch die Position des nun direkt auf die Siebauflage 22 aufgelegten Siebes 24 exakt bekannt, so dass beim Einschieben der Siebhalterung 10 entlang der Führungsbahn 12 unter den Kasten 26 die Position des Siebes 24 exakt bekannt ist mit der Folge, dass der Laser entsprechend präzise fokussiert werden kann, um eine scharfes Bild auf das Sieb 24 zu projizieren.As Fig. 3 can be seen in detail, while hanging the frame 28 free-floating in the air and while only the sieve 24 rests on the sieve support 22. Due to the weight of the usually made of metal frame 28 while the screen 24 is held on the screen support 22 and even stretched a bit. After the position of the screen support 22 is exactly known, the position of the screen 24 now placed directly on the screen support 22 is also known exactly, so that the position of the screen 24 is exactly known when the screen support 10 is inserted along the guide track 12 under the box 26 with the result that the laser can be correspondingly precisely focused to project a sharp image on the screen 24.

Nachdem das Sieb 24 entsprechend laserbelichtet ist, braucht die Siebhalterung 10 lediglich entlang der Führungsbahn 12 wieder vorgezogen werden, bevor das Sieb zur weiteren Bearbeitung von der Siebauflage 22 entfernt wird.After the wire 24 has been correspondingly laser-exposed, the wire holder 10 only needs to be pulled forward along the guide track 12 before the wire is removed from the wire support 22 for further processing.

In einer anderen, hier nicht dargestellten Ausführungsform kann die Siebauflage statt des umlaufenden Steges auch durch eine Anzahl, vorzugsweise vier, Stempel gebildet werden, die an ihrer Stirnseite ebenfalls eine plane Auflagefläche aufweisen.In another embodiment, not shown here, the screen support instead of the circumferential web can also be formed by a number, preferably four, stamp, which also have a flat support surface on its front side.

In noch einer anderen, hier nicht dargestellten Ausführungsform kann das Sieb auch vertikal angeordnet werden und beispielsweise mittels eines Schlittens in den Fokus des Laserbelichters gefahren werden. Bei dieser Ausführungsform kann das Sieb durch entsprechend verfahrbare Stempel oder durch einen entsprechend verfahrbaren umlaufenden Steg vorgespannt werden. Dabei werden die Stempel bzw. dabei wird der Steg horizontal bewegt und quer zur Siebfläche an das Sieb herangefahren, solange bis das Sieb entsprechend gespannt ist. Dann kann anhand der Position der Auflageflächen der Stempel bzw. des Stege die exakte Position des Siebes bestimmt werden, so dass der Laser auf diese Position fokussiert werden kann.In yet another embodiment, not shown here, the screen can also be arranged vertically and, for example, moved by means of a carriage in the focus of the laser exposure. In this embodiment, the screen can be biased by appropriately movable punch or by a corresponding movable peripheral web. The stamp or thereby the web is moved horizontally and moved up to the sieve surface to the screen until the screen is stretched accordingly. Then, based on the position of the bearing surfaces of the punch or the webs, the exact position of the screen can be determined, so that the laser can be focused on this position.

In einer in Figur 7 dargestellten alternativen Ausführungsform ist im Sieb 24' eine erste Positionierungsöffnung 30' kreisrund ausgebildet, während die zweite Positionierungsöffnung 32' als Langloch ausgebildet ist. Hierdurch wird ein Verkanten des Rahmens 28' beim Ablegen des Siebes 24' auf der Siebhalterung 10 oder beim Abnehmen des Siebes 24' von der Siebhalterung 10 vermieden.In an in FIG. 7 illustrated alternative embodiment, a first positioning hole 30 'is formed circular in the screen 24', while the second positioning hole 32 'is formed as a slot. As a result, tilting of the frame 28 'when placing the screen 24' on the screen holder 10 or when removing the screen 24 'of the screen holder 10 is avoided.

Bezugszeichenliste:LIST OF REFERENCE NUMBERS

1010
Siebhalterungscreen support
1212
Führungsbahnguideway
1414
Tischtable
1616
Positionierstiftepositioning
1818
Positionierstiftepositioning
2020
Stegweb
2222
Siebauflagescreen support
24, 24'24, 24 '
Siebscree
2626
Kastenbox
28, 28'28, 28 '
Rahmenframe
30, 30'30, 30 '
Positionieröffnungenpositioning
32, 32'32, 32 '
Positionieröffnungenpositioning

Claims (8)

  1. A laser exposure apparatus for exposing a screen (24) held in a frame (28), said laser exposure apparatus having an exposing unit, a screen holding device (10) for defined positioning of the screen (24) to be exposed and a screen (24) held in a frame (28),
    characterized in
    that said screen holding device (10) includes a screen support (22) having a defined supporting surface, said screen support (22) being arranged for said screen (24) to rest on said screen support (22) whilst said frame (28) is freely suspended beside said screen support (22), being held by said screen (24), and that at least one positioning pin (16, 18) is mounted to said screen holding device (10) and engages into a positioning opening (30, 32) provided on said frame (28) if said screen (24) rests on said screen support (22).
  2. The laser exposure apparatus as set forth in claim 1,
    characterized in
    that exactly two positioning pins (16, 18) and two positioning openings (30, 32) are provided.
  3. The laser exposure apparatus as set forth in any one of the previous claims,
    characterized in
    that the positioning pins (16, 18) have a circular cross section.
  4. The laser exposure as set forth in any one of the previous claims,
    characterized in
    that the positioning pins (16, 18) are adapted to be inserted into the positioning openings (30, 32) so as to correspond to, and register with zero clearance with, said positioning pins.
  5. The laser exposure apparatus as set forth in claim 2,
    characterized in
    that the two positioning pins have a circular cross section, with one positioning opening (30') being configured to have a circular cross section for registering with and receiving with zero clearance a positioning pin, whilst the other positioning opening (32') is configured to be a long hole for registering with and receiving, in one direction with zero clearance and in the other direction with clearance, said positioning pin.
  6. The laser exposure as set forth in any one of the previous claims,
    characterized in
    that the screen support (22) is configured as a perimeter ledge (20) projecting upward, a planar supporting surface being formed on said ledge (20).
  7. The laser exposure as set forth in any one of the previous claims,
    characterized in
    that the screen support includes at least four upwardly projecting stamps, with each stamp comprising a planar supporting surface and said supporting surfaces of the stamps being aligned.
  8. The laser exposure as set forth in any one of the previous claims,
    characterized in
    that the screen support (22) is brought to fit against the border of the screen (24).
EP06003425A 2005-02-18 2006-02-20 Laser imager for imaging a screen in a screen holder Not-in-force EP1693197B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005007439A DE102005007439A1 (en) 2005-02-18 2005-02-18 A method of laser exposure of a screen and laser printer held in a frame therefor

Publications (3)

Publication Number Publication Date
EP1693197A2 EP1693197A2 (en) 2006-08-23
EP1693197A3 EP1693197A3 (en) 2007-04-25
EP1693197B1 true EP1693197B1 (en) 2008-10-15

Family

ID=36607599

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06003425A Not-in-force EP1693197B1 (en) 2005-02-18 2006-02-20 Laser imager for imaging a screen in a screen holder

Country Status (5)

Country Link
US (1) US20060198410A1 (en)
EP (1) EP1693197B1 (en)
AT (1) ATE411167T1 (en)
DE (2) DE102005007439A1 (en)
ES (1) ES2317352T3 (en)

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988003092A1 (en) * 1986-10-29 1988-05-05 Holderegger Juerg Device for silk screen printing with level and flexible printing silks
US4993166A (en) * 1989-04-10 1991-02-19 Carlos Bradley Adjustable pin guide for use in screen printing
JP2717707B2 (en) * 1989-07-14 1998-02-25 株式会社村田製作所 Screen printing method, printing plate manufacturing method and apparatus therefor
GB9104705D0 (en) * 1991-03-06 1991-04-17 Lowe John M Vision system
US5189951A (en) * 1991-12-04 1993-03-02 Gerber Scientific Products Planar support for material mounted to a frame and method of use
TW289901B (en) * 1994-12-28 1996-11-01 Ricoh Microelectronics Kk
SE503540C2 (en) * 1995-02-15 1996-07-01 Svecia Screen Printing Systems Method and apparatus for making a stencil
EP0811484A1 (en) * 1996-06-06 1997-12-10 Heinrich Mantel AG Positioning system for screen printing frames
US5819653A (en) * 1996-10-22 1998-10-13 Mccue; Geoffrey A. Method for making a screen printing screen
NL1012098C2 (en) * 1999-05-19 2000-11-21 Stork Screens Bv A method for manufacturing a printing form and a laser device which can be used therewith.
AU3834800A (en) * 2000-03-24 2001-10-03 F. Lli Robustelli Srl Method for centered screen printing and apparatus
JP3504623B2 (en) * 2001-03-12 2004-03-08 マイクロ・テック株式会社 Screen printing device and screen plate setting method

Also Published As

Publication number Publication date
DE102005007439A1 (en) 2006-08-31
ATE411167T1 (en) 2008-10-15
DE502006001796D1 (en) 2008-11-27
US20060198410A1 (en) 2006-09-07
EP1693197A3 (en) 2007-04-25
ES2317352T3 (en) 2009-04-16
EP1693197A2 (en) 2006-08-23

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