EP2160652A2 - Dispositif d'exposition par contact d'un pochoir - Google Patents

Dispositif d'exposition par contact d'un pochoir

Info

Publication number
EP2160652A2
EP2160652A2 EP08773267A EP08773267A EP2160652A2 EP 2160652 A2 EP2160652 A2 EP 2160652A2 EP 08773267 A EP08773267 A EP 08773267A EP 08773267 A EP08773267 A EP 08773267A EP 2160652 A2 EP2160652 A2 EP 2160652A2
Authority
EP
European Patent Office
Prior art keywords
light
emitting diodes
printing
light source
emitting diode
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP08773267A
Other languages
German (de)
English (en)
Inventor
Hans-Herbert Frintrup
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.)
LINDTHALER, JOSEF
Original Assignee
Lindthaler Josef
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 Lindthaler Josef filed Critical Lindthaler Josef
Publication of EP2160652A2 publication Critical patent/EP2160652A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/70—Microphotolithographic exposure; Apparatus therefor
    • G03F7/70383—Direct write, i.e. pattern is written directly without the use of a mask by one or multiple beams
    • G03F7/70391—Addressable array sources specially adapted to produce patterns, e.g. addressable LED arrays
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/20—Exposure; Apparatus therefor
    • G03F7/2002—Exposure; Apparatus therefor with visible light or UV light, through an original having an opaque pattern on a transparent support, e.g. film printing, projection printing; by reflection of visible or UV light from an original such as a printed image
    • G03F7/2004—Exposure; Apparatus therefor with visible light or UV light, through an original having an opaque pattern on a transparent support, e.g. film printing, projection printing; by reflection of visible or UV light from an original such as a printed image characterised by the use of a particular light source, e.g. fluorescent lamps or deep UV light
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/20—Exposure; Apparatus therefor
    • G03F7/2002—Exposure; Apparatus therefor with visible light or UV light, through an original having an opaque pattern on a transparent support, e.g. film printing, projection printing; by reflection of visible or UV light from an original such as a printed image
    • G03F7/2014—Contact or film exposure of light sensitive plates such as lithographic plates or circuit boards, e.g. in a vacuum frame

Definitions

  • the present invention relates to a device for contact exposure according to the preamble of claim 1.
  • a lamp for the exposure of screen printing stencils or the like in which nine LEDs arranged in a row are used as the light source, each LED emitting ultraviolet light.
  • the individual LEDs can be actuated individually or in sections.
  • This lamp generates by the arrangement of the light emitting diodes provided in series a linear light beam which is movable over the printing stencil to expose them. Due to the geometry of the light source, each individual light-emitting diode must be relatively bright, so that the line-shaped area to be illuminated by the light source is sufficiently illuminated. Such a correspondingly strong LED also generates significant amounts of scattered light and waste heat, so that the light source must be equipped with cooling fins. On the other hand, the scattered light can not be used for targeted exposure of the printing stencil.
  • DE 20 2005 017 044 U1 It is also proposed in DE 20 2005 017 044 U1 to use monochromatic light-emitting LEDs. In this case, however, only a UV exposure of a specific wavelength can take place, so that the field of application of this luminaire is limited.
  • DE 203 16241 U1 describes an exposure device for exposing a printed circuit board whose light source is formed from a number of light-emitting diodes, wherein the light-emitting diodes are arranged on a square surface. It is also described in this document that the exposure device is designed as a light source row, wherein the individual light-emitting diodes are arranged next to one another in the row. The latter light source row can be moved by means of a scanning device over the printing template to fully illuminate it.
  • the present invention the object of the invention to provide a device for contact exposure of the type mentioned, which, despite lower energy light emitting diodes of the photosensitive emulsion on the stencil sufficient energy to coincidebelichten.
  • a device for contact exposure with the features of claim 1 is proposed according to the invention.
  • Advantageous developments of this device can be found in the dependent claims.
  • a trained according to this technical teaching device for contact exposure has the advantage that a well-defined light of different frequencies is available through the use of different monochromatic light emitting diodes. This makes it possible to adapt the light to the specific conditions of the emulsion, so that an optimal and rapid exposure and thus curing of the emulsion is achieved.
  • light emitting diodes are used with two different frequencies, with a first frequency is optimized for surface hardening, z. B. 395 nm, while the second frequency is optimized for depth curing, z. B. 365 nm.
  • light-emitting diodes with a plurality of different frequencies, in particular with 355 nm, 365 nm, 375 nm, 385 nm, 395 nm, are used. This has the advantage that it covers an entire light spectrum from 350 nm to 400 nm.
  • the light-emitting diodes In order to obtain as uniform a light as possible over the entire length of the light source, it is advantageous to arrange the light-emitting diodes alternately so that adjacent light-emitting diodes have a different frequency.
  • the arrangement of the LEDs in a row has the advantage that this results in a linear light beam.
  • different light fields are formed in the light source, wherein a number of light-emitting diodes are provided in each light field.
  • a number of light-emitting diodes are provided in each light field.
  • four different monochromatic light emitting diodes are provided which emit UV light in different wavelengths, In this way, the desired light spectrum can be used in a precise manner, which is required for optimal exposure of the emulsion of the printing stencil.
  • each light-emitting diode or each LED group individually controllable so that light of the desired wavelength can be made available for each application.
  • This has the advantage that on the one hand the most favorable light for the respective emulsion can be used, and on the other hand it has the advantage that the example light of a certain wavelength for surface drying and light of another wavelength is used for deep drying of the emulsion, so that the Emulsion is dried out in no time.
  • Another advantage is that the individual fields can be prepared in series, z. B. by the desired LEDs are mounted on a corresponding board. Then only this prepared board needs to be mounted in the housing of the light source. The arrangement of the individual fields in a row, a quasi-line-shaped light beam is generated, which extends over the entire width of the stencil.
  • the device can be used for a wide range of applications.
  • the light emitting diodes of a light emitting diode group are arranged side by side in a row. As a result, the linear radiation of the light is supported. Another advantage is that light-emitting diodes of lower power can be used by the targeted wavelength used, which saves costs, which causes less stray light and which leads to a lower heat development.
  • Figure 1 is a schematic representation of a first embodiment of a device according to the invention in front view.
  • Fig. 2a is a schematic representation of the device of Figure 1 in side view.
  • FIG. 2b shows an enlarged detail of the device according to FIG. 2a, along the line II in FIG. 2a;
  • FIG. 3a shows a schematic representation of a second embodiment of a device according to the invention in side view
  • FIG. 3b shows an enlarged detail of the device according to FIG. 3a along the line III in FIG. 3a
  • FIG. 4 shows a schematic representation of a third embodiment of a device according to the invention in side view
  • 5 shows a schematic representation of a fourth embodiment of a device according to the invention in side view
  • FIG. 6 shows a schematic view of the light source of the first embodiment according to FIG. 1 in a bottom view
  • FIG. Fig. 7 is a schematic representation of the light source of a fifth
  • FIG. 8 is a schematic representation of the light source of a sixth
  • a first embodiment of a device according to the invention for contact exposure of a printing stencil 102 is shown.
  • Such printing stencils 102 are used, for example, in screen printing, offset printing, pad printing, flexographic printing or similar printing methods.
  • This device is shown in the drawing only very schematically simplified, but shows all the essential details.
  • the device 100 for contact exposure of a printing stencil comprises here not shown means for receiving a photosensitive printing stencil 102, which is provided with a photosensitive emulsion and also not shown here means for receiving a motif-bearing film 104, and a light source 106.
  • the light source 106 extends in width over the entire printing stencil 102 and can be moved longitudinally over the printing stencil 102, so that the essentially linear light emanating from the light source 106 passes over the entire printing stencil 102.
  • the film 104 is vacuum drawn onto the stencil sheet 102 to minimize the distance between the film 104 and the stencil sheet 102.
  • a glass sheet 108 which rests on the film 104 to avoid curling in the film 104 and to ensure that the film 104 resting on the stencil sheet 102 forms a planar surface, so that correct exposure of the film 104 is achieved Printing template 102 takes place.
  • the light source 106 in this embodiment comprises twelve light fields 110, which are juxtaposed in a row in a housing 112 of the Light source 106 are arranged.
  • Each light field 110 comprises five light-emitting diode groups 114 and each light-emitting diode group 114 comprises eight light-emitting diodes 116.
  • the light-emitting diodes 116 of a single light-emitting diode group 114 are arranged next to one another in a row. Consequently, the light-emitting diode group 114 consists of five rows of light-emitting diodes 116 with a total of 40 light-emitting diodes 116.
  • the light emitting diodes 116 used here are so-called laser diodes (LED) of a specific wavelength. Meanwhile, modern laser diodes now have a wavelength spectrum of only 10 nm with a light distribution corresponding to a Gaussian curve, with the highest light intensity in the middle of the spectrum.
  • LED laser diodes
  • the light-emitting diodes 116 of the first light-emitting diode group 114 have a wavelength of 355 nm
  • the second light-emitting diode group 114 comprises light-emitting diodes 116 with a wavelength of 365 nm, the third 375 nm, the fourth 387 nm and the fifth 395 nm, so that the light field 110 UV Light with a wavelength spectrum of 350 nm to 400 nm covers.
  • Each light-emitting diode group 114 can be switched individually, so that either only a single light-emitting diode group 114 or two or more light-emitting diode groups 114 are activated simultaneously. Any combination is conceivable. In another, not shown embodiment, each LED is individually controlled.
  • the emulsion used on the printing templates 102 has different chemical stabilizers which react particularly well to light of a specific wavelength. If the printing stencil is exposed to light of this wavelength, the emulsion hardens much faster.
  • the wavelength of the light can be optimized for the emulsion used, so that a faster curing of the emulsion takes place.
  • the power of the light-emitting diode can be lowered, without any loss to be expected during the exposure.
  • the light fields 114 with their monochromatic light-emitting diodes 116 at two different wavelengths, wherein a certain wavelength in the emulsion causes some depth drying and another wavelength which drives surface drying of the emulsion.
  • a particularly good drying of the emulsion can be achieved in a very short time.
  • a further advantage is that the targeted selection of the effective wavelength of the light-emitting diodes 116 results in a faster exposure, so that the light-emitting diodes 116 can be used with a lower power. This not only saves money, but also reduces the heat development in the light source.
  • SMD components surface-mounted device
  • electroluminescent diodes may also be used as light sources.
  • the housing 112 of the light source 106 encloses the light-emitting diodes 116 such that at least one front wall 118 and one rear wall 120 project beyond the light-emitting diodes 116 in the direction of the printing template 102.
  • the front 118 and the rear wall 120 are designed to be reflective on the inside in order to reflect the stray light emanating from the light emitting diodes 116 as well as possible.
  • a cylindrical solid glass rod 122 is provided below the light source 106, wherein the front 118 and the rear wall 120 of the light source 106 reach up to the solid glass rod 122.
  • the light emanating from the light fields 110 strikes the surface of the solid glass rod 122 and becomes approximately parallelized by this, so that incident on the glass 108 according to parallel aligned light beams.
  • These rays of light pass in parallel through the glass pane 118 and in turn impinge in parallel onto the film 104, the light rays being absorbed in the area of the motif 124 and passing through the film 104 only in the non-motif areas and the emulsion of the printing stencil 102 being exposed.
  • the light emanating from the light source 106 is always aligned in parallel, even if the light source 106 is moved longitudinally over the printing stencil 102. As can be seen in particular from FIG. 2b, this parallel light generates very sharp printed edges on the emulsion of the printing stencil 102, so that high-precision images are produced as a result.
  • a second device 200 for contact exposure of a printing template illustrated in FIGS. 3 a and 3 b corresponds to the first device 100 described above, except that the solid glass bar 222 of the device 200 has a comparatively large distance from the light source 206. Because of this large distance, the light rays emanating from the light source 206 are focused by the solid glass rod 222 onto a quasi-line-shaped region, so that this line-shaped region is irradiated with light of a very high intensity. As a result, it is possible to be able to move the light source 206 over the printing template 202 at a higher speed, since this focused light provides for evaluation of the emulsion of the printing template 202 in a shorter time.
  • the power of the LED can be reduced, resulting in a longer life, lower heat and less stray light.
  • the solid glass rod is slidably held on the light source, so that the desired distance of the solid glass rod to the light source can be adjusted individually. Intermediate values can also be set in order to achieve partial focusing of the light beams.
  • the device 300 for contact exposure of a printing stencil shown in FIG. 4 differs from the device 100 only in that here a half-glass rod 326 is used, which parallelises the light emanating from the light fields 310.
  • Both the solid glass bar 122, 222 and the half-glass bar 326, 426 are coated on their surface facing the light source 106, 206 by means of a surface coating so that UV light of the wavelength of 350 nm to 400 nm almost completely enters the solid glass bar 122, 222, or half-glass rod 326, 426 may occur. As a result, reflections and the associated scattered light are reduced to a minimum.
  • the device 400 for contact exposure of a printing template shown in FIG. 5 differs from the device 200 shown in FIGS. 3 a and 3 b only in that here a half-glass rod 426 focuses the light emanating from the light fields 410.
  • the light source 506 shown schematically in FIG. 7 belongs to a fifth embodiment of a contact exposure apparatus according to the invention, wherein light sources 516 having a frequency of 365 nm and light emitting diodes 516 'having a frequency of 395 are alternately arranged in the light source 506 in a row nm are provided.
  • the light emitting diodes 516 '(395 nm) are used for surface hardening of the emulsion, while the light emitting diodes 516 "(365 nm) used for deep curing of the emulsion.
  • the light source 606 shown schematically in FIG. 8 belongs to a sixth embodiment of a device according to the invention for contact exposure, wherein in the light source 606 in a row alternating light emitting diodes 616 with a frequency A of 365 nm, light emitting diodes 616 'with a frequency B of 375 nm, light-emitting diodes 616 "having a frequency C of 385 nm and light-emitting diodes 616 '" having a frequency D of 395 nm are provided, so that a broad spectrum of light is covered thereby.
  • the light emitting diodes 516, 516 ', 616, 616 ", 616", 626'" can each be controlled individually, so that, depending on the application, light of a specific wavelength or a specific combination of two or more
  • the light-emitting diodes 516, 516 'and 616, 616', 616 ", 626 '" are monochrome light-emitting diodes with a light field of approximately 2 to 3 mm
  • monochrome Arrayleuchtdioden can be used, the light field about 8 mm
  • the series-arranged LEDs have a distance of about 1 cm, each calculated from the center.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Exposure And Positioning Against Photoresist Photosensitive Materials (AREA)
  • Photosensitive Polymer And Photoresist Processing (AREA)

Abstract

La présente invention concerne un dispositif d'exposition par contact d'un pochoir (202), de préférence à utiliser en sérigraphie, en impression offset, en tampographie, en flexographie ou analogue, comprenant des moyens pour prendre en charge un pochoir (202) photosensible, des moyens pour prendre en charge d'un film qui porte le motif, et une source de lumière formée de diodes luminescentes, la source de lumière (206) émettant de la lumière sensiblement linéaire et pouvant être mise en mouvement le long du pochoir (202). Pour permettre la réalisation d'un dispositif d'exposition par contact qui, malgré l'utilisation de diodes luminescentes (116) à faible énergie, assure un éclairage suffisant de l'émulsion photosensible sur le pochoir, un certain nombre de champs lumineux sont formés dans la source de lumière (206), chaque champ lumineux présentant un certain nombre de diodes luminescentes, et les champs lumineux étant disposés sur une rangée, et deux à six, de préférence quatre groupes de diodes luminescentes différents se trouvent dans chaque champ lumineux (110), chaque groupe de diodes luminescentes contenant des diodes luminescentes de même longueur d'onde qui émettent une lumière approximativement monochromatique.
EP08773267A 2007-06-22 2008-06-21 Dispositif d'exposition par contact d'un pochoir Withdrawn EP2160652A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007028860A DE102007028860A1 (de) 2007-06-22 2007-06-22 Vorrichtung zur Kontaktbelichtung einer Druckschablone
PCT/DE2008/001001 WO2009000242A2 (fr) 2007-06-22 2008-06-21 Dispositif d'exposition par contact d'un pochoir

Publications (1)

Publication Number Publication Date
EP2160652A2 true EP2160652A2 (fr) 2010-03-10

Family

ID=40030787

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08773267A Withdrawn EP2160652A2 (fr) 2007-06-22 2008-06-21 Dispositif d'exposition par contact d'un pochoir

Country Status (3)

Country Link
EP (1) EP2160652A2 (fr)
DE (1) DE102007028860A1 (fr)
WO (1) WO2009000242A2 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2845732B1 (fr) 2010-09-24 2017-03-22 KBA-NotaSys SA Presse à imprimer sur feuilles et procédé pour orienter des flocons magnétiques contenus dans un véhicule d'encre ou de vernis appliqués sur un substrat de type feuille
FR2977947B1 (fr) * 2011-07-11 2013-07-05 Photomeca France Exposeuse uv pour plaques d'impression
US20150336372A1 (en) * 2013-05-28 2015-11-26 Claude Louis Van Ness Screen Printing Device and Method
DE102017103624A1 (de) 2017-02-22 2018-08-23 Manz Ag Belichtungsanlage

Citations (1)

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Publication number Priority date Publication date Assignee Title
WO2005057670A2 (fr) * 2003-12-02 2005-06-23 3M Innovative Properties Company Appareil et procede de modification de diodes electroluminescentes

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Publication number Priority date Publication date Assignee Title
US6369845B1 (en) * 2000-03-14 2002-04-09 Kubota Research Associates Inc. Exposure system for recording media
US20020192569A1 (en) * 2001-05-15 2002-12-19 The Chromaline Corporation Devices and methods for exposure of photoreactive compositions with light emitting diodes
EP1508157B1 (fr) * 2002-05-08 2011-11-23 Phoseon Technology, Inc. Source lumineuse a semi-conducteurs a haut rendement et leurs procedes d'utilisation et de fabrication
US20040164325A1 (en) * 2003-01-09 2004-08-26 Con-Trol-Cure, Inc. UV curing for ink jet printer
DE20316241U1 (de) 2003-10-20 2004-02-26 Geburek, Frank, Dipl.-Ing. (TH) Belichtungsvorrichtung für eine Schaltungsplatte
DE202004017044U1 (de) 2004-11-02 2005-01-13 Technigraf Gmbh Leuchte zur Belichtung von Siebdruckschablonen, Offsetdruckplatten, Flexodruckplatten, Inkjet-Beschichtungen o.dgl. sowie Vorrichtung zur Belichtung
US20060164614A1 (en) * 2005-01-21 2006-07-27 Hua-Kuo Chen Exposing machine for a printed circuit board
DE202005017044U1 (de) 2005-11-02 2006-01-05 Lau, Tung Yan, Fotan Leicht zu positionierender Einfach-Locher

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005057670A2 (fr) * 2003-12-02 2005-06-23 3M Innovative Properties Company Appareil et procede de modification de diodes electroluminescentes

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2009000242A2 *

Also Published As

Publication number Publication date
WO2009000242A3 (fr) 2009-03-05
DE102007028860A1 (de) 2008-12-24
WO2009000242A2 (fr) 2008-12-31

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