EP0790081B1 - Dispositif pour revêtir des substrats - Google Patents

Dispositif pour revêtir des substrats Download PDF

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Publication number
EP0790081B1
EP0790081B1 EP97101696A EP97101696A EP0790081B1 EP 0790081 B1 EP0790081 B1 EP 0790081B1 EP 97101696 A EP97101696 A EP 97101696A EP 97101696 A EP97101696 A EP 97101696A EP 0790081 B1 EP0790081 B1 EP 0790081B1
Authority
EP
European Patent Office
Prior art keywords
substrate
filter
liquid
reservoir
pump
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP97101696A
Other languages
German (de)
English (en)
Other versions
EP0790081A2 (fr
EP0790081A3 (fr
Inventor
Eggo Sichmann
Reinhard Gerigk
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.)
Singulus Technologies AG
Original Assignee
Singulus Technologies AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Singulus Technologies AG filed Critical Singulus Technologies AG
Publication of EP0790081A2 publication Critical patent/EP0790081A2/fr
Publication of EP0790081A3 publication Critical patent/EP0790081A3/fr
Application granted granted Critical
Publication of EP0790081B1 publication Critical patent/EP0790081B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/10—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material
    • B05C11/1039—Recovery of excess liquid or other fluent material; Controlling means therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/02—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface
    • B05C11/08—Spreading liquid or other fluent material by manipulating the work, e.g. tilting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/10—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/10—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material
    • B05C11/1042—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material provided with means for heating or cooling the liquid or other fluent material in the supplying means upstream of the applying apparatus

Definitions

  • the invention relates to a device for Surface coating or for painting substrates or disk-shaped substrates such as a disk-shaped Information carrier, which on the substrate carrier agents to be applied or the paint liquid applied to the substrate via a feed device becomes.
  • EP-A-0 334 535 describes a method for surface coating a known electrical cable. Liquid released from the cable Coating material is collected in a collecting container, on a filter passed on and from the filter by means of a pump into the collecting container returned.
  • the invention has for its object an improved Device for surface coating or to paint substrates, at which too perfect for liquids with high viscosity Operation of the entire device can be maintained can.
  • the object is achieved in that in the fluid circuit between a first drain line of the first container and a second container or / and the pump a vacuum pump (30) integrated or or to the Device is connected.
  • a vacuum pump (30) integrated or or to the Device is connected.
  • liquid medium can also or high viscosity paint through the Move the filter system and the desired one for the liquid Achieve purity and trouble-free conveying.
  • filters Due to the vacuum operation, filters can also be used very close-meshed filter elements are used, without reducing the throughput time of the lacquer throughout Device is adversely affected.
  • By the advantageous use of negative pressure operation can filters of this type are also in use for considerably longer remain as next to the pump in connection with the vacuum a high flow rate of the coating liquid is ensured.
  • the substrate carrier dispensed liquid medium or the paint at least is delivered to a first collecting container, which is connected to at least one filter from which the liquid directly or indirectly via a Pump is directed to the first container, where between the first tank and the pump a vacuum pump integrated or connected to the device is, the substrate carrier via a drive device drivable or in a rotational movement is relocatable.
  • An additional option is according to a training the device according to the invention that between a second container for the filter and the pump of the liquid medium and the vacuum pump to one Return device is connected.
  • the vacuum pump is connected and that the vacuum pump is designed as a venturi nozzle, which is connected to the second container. Because the vacuum pump, which is also designed as a venturi nozzle may be behind the filter the paint liquid in the attached to the filter subsequent container pulled so that next to the geodetic height as delivery pressure the vacuum, which is generated by the vacuum pump as a funding can be used.
  • the vacuum pump or the venturi to the Top of the second container connected so that above the liquid level of the paint Gas medium or the air from the second container at least partially evacuated and thereby the liquid medium from the filter to the second collection container can be pulled.
  • the Outlet line of the filter to the second container connected so that, for example, gas inclusion showing medium through this facility in addition can be degassed and sources of error in the paint layer almost completely excluded on the substrate can be.
  • Solution is finally provided that the first container via a liquid line and a the first valve interrupting the inflow to the filter is connected to the filter and that the first container via a liquid line and a second valve either with the container or a third valve is connectable to the tank. Because the first container can be shut off from the filter with a valve the filter even during the work of the whole Device replaced without decommissioning the system be because the upper container by appropriate Facilities sufficient with paint medium for the maintenance work can be filled so that an interruption of the work process or the Painting can be avoided.
  • the system automatically supply paint when in the second container the paint liquid is reduced to a minimum has been.
  • the pumped Liquid or the paint over a Heater connected to the nozzle of the feeder is.
  • a heater in the supply line to the container it becomes possible in a simple way heat the paint liquid so that a even application of varnish on the surface of the substrate is guaranteed.
  • By lowering the viscosity will also be unevenness in the layer surface avoided, and thereby the error rate when applying paint reduced.
  • the substrate or the substrate carrier by means of a guide device or in such a setting is adjustable that the feed device for application the liquid or the paint in the area of Substrate approximately parallel to the surface of the substrate performed and at any point above the Substrate can be stopped.
  • the feed device connected to the drive device and by a Feeder is included and that the Carrying device by means of the guide device in adjustable horizontally and / or vertically is.
  • the drive device with a stepper motor or electrical or electro-hydraulic Stepper motor is operatively connected and that the Drive device has a stepper motor, the via a gear or rack or worm gear drivingly connected to the guide device is.
  • the liquid from the substrate carrier (14) Medium or the varnish (4) at least to a first one Container (27) is dispensed with at least a filter (28) is connected, from which the liquid directly or indirectly via a pump (29) the first container (27) is passed, whereby between a first drain line (33) of the first Container (27) and the pump (29) a negative pressure is adjustable.
  • the painting head 49 is according to FIGS. 1 and 2 via a Shaft 54 connected to a drive motor 60.
  • the painting head 49 has a guide device 18, made up of two truncated pyramids, firmly connected guide elements 19, 20, which has openings Fins 56 with a substrate carrier or plate 14 firmly are connected.
  • the upper part of the guide element 19 of the Guide device 18 extends with respect to the central axis R inclined and pyramidal towards the top.
  • On the guiding device 19 closes, as already mentioned, the lower, also to the central axis R tapered guide element 20.
  • the guide device 18 opens into an annular channel 57, which according to a line Figure 1 opens into a first container 27 and which is formed in a coaxial part 25 with a central bore 26.
  • a liquid or a lacquer 4 passes over a feed device 6, as from the closer below 3 and 4, and an associated nozzle 5 on the substrate 2, while the substrate 2 is rotating via the motor 60 is transferred.
  • the paint 4 flows as a result the centrifugal force on the surface of the substrate 2 radially outwards and passes over the edge of the substrate and the guide device 18 in the ring channel 57. Additional excess paint particles are in Form of a paint mist from the surface of the substrate 2 hurled.
  • These paint parts are made by one second ring-shaped, attached to the outer contour of the guide element 19 adjoining guide device 22 suctioned off, a suction opening in the lower area 24 has, so that the guide 22 captured paint particles also the first container 27 can be supplied.
  • the centrifuged paint liquid gets through the Painting head 49 or the associated guide elements 19, 20 and the associated outlet openings 23 in the first Container 27.
  • the first container 27 is over a liquid line 33, which acts as a return line is formed, and via a first control valve 34 a liquid line 59 connected with her upper end au the upper end of a container 35 and with its lower end to an inlet opening 74 of a filter 28 is connected.
  • a second valve 36 is located in line 59, through which the tank 35 via line 59 with the inlet opening 74 of the filter 28 can be connected when paint liquid 4 from the tank 35 through the filter 28 are fed to a second container 31 should.
  • the outlet opening 61 of the filter 28 via a line 43 to the upper end of the second container 31 connected.
  • the lower End of the container 31 is also a valve 37 and a line 39 with a second inlet opening 62 of the filter 28 in connection, so that the im Filter remaining filtered liquid in the second container 31 can expire when the filter cartridge of the filter 28 is to be changed.
  • the Filter 28 has a centrally arranged tube 75 equipped to ensure that liquid flows over the upper end of the tube and thus the filter cartridge always completely in liquid.
  • the coating liquid passes from the first container 31 4 'via a line 47 to a pump which as Dosing pump 29 can be formed.
  • the pump 29 will driven by a stepper motor 63, so that at one corresponding control impulse paint liquid from the Container 31 via the metering pump 29 and a Line 46, a control valve 51, an electric heater 39 and the line 47 fed to the painting head 49 can be.
  • the pump or the metering pump 29 also protrudes a line 45 and a control valve 52 with the first Container 27 in connection. So that the pump or Diaphragm pump 29 can work properly is under the dosing pump 29 a check valve 38 is provided.
  • Check valve 38 ensures that only the paint liquid 4 'from the second container 31 is conveyed to the first container 27.
  • the fill level indicator 40 consists, among other things, of two sensors 41, 42 arranged at a distance from one another, which are accommodated in the upper container 27 and in the lower container 31, which is also referred to as the second container 31.
  • the first sensor 41 has a height H 1 and the second sensor 42 has a height H 2 with respect to a floor 53.
  • the container 31 there are also two identical sensors 41, 42, which have an upper measuring point with the height H 1 and a height H 2 with respect to the bottom 53. These two measuring points of the two sensors 41, 42 can be wetted by the paint.
  • the sensors 41, 42 are supplied with a DC voltage, the resistance value to the housing being measured.
  • the different filling level in the container 27 or 31 influences the resistance value.
  • the signal evaluation of the measured values of the two sensors 41, 42 can be recalibrated at any time when the liquid introduced into the container 27, 31 wets the two measuring points.
  • the sensors 41, 42 and the container 27, 31st are each via an electrical line 71 to the Evaluation unit 69 connected by means of the measured values the sensor 41 and 42 detected and the so determined Measured values from the different heights as a control variable used to control the individual valves, for example the two containers 27 and 31 to supply with liquid medium and at a certain Degree of contamination, the switching valve 34 to Close filter 28.
  • a Background curve or measurement curve resistance above the filling level
  • these Curve later when measuring the height of the liquid in the Containers are available as a relative reference size stands.
  • the resistance elements or sensors becomes. After such a calibration can even with only one sensor, for example with the sensor 42, the actual size or the fill level can be determined in the container 27 and / or 31.
  • the measuring points or resistance values determined in this way give the operator information about the respective filling status Information about when, for example, the lower collecting container 31 again via the tank 35 new paint or over the container 27 with used Paint should be supplied.
  • the time of filter replacement can also be changed determine by means of sensors 41, 42. Since with knowledge about the fill level of both containers 27 and 31 Return speed of the cleaned to be determined Liquid can be determined from the filter 28 the return quantity can also be a variable for control of the valves 34, 36, which are then closed must if the filter 28 with considerable contamination needs to be replaced. Due to the reduced return flow the filter 28 also becomes the container 31 not refilled so quickly, so this Time factor in connection with the fill level in the container 31 represents a manipulated variable on the basis of how already mentioned, the filter exchange described makes sense is.
  • the upper container 27 is also said to be advantageous Just a minimal amount of paint liquid so that only little paint liquid in the overall system is circulated continuously. This will ensures that there is no aging process in the paint liquid occurs because after a relatively short time the Most of the paint is used up before it is unused Paint from the tank 35 fed to the container 31 becomes.
  • the control valve 36 is or control unit 69 opened and the paint overflows the filter 28 into the container 31 until the desired one reached the maximum filling level and the sensor 41 for automatic calibration with liquid is brought into contact. After that time the control valve 34 or 36 is automatically in again brought a closed position.
  • the two sensors 41, 42 can be used as resistance sensors be trained.
  • the lower container 31 is not filled up accordingly, so the lower sensor 42 a corresponding manipulated variable to the evaluation unit 69 transmitted, via which the control valve 34, 36 can be opened.
  • 4 is the feed device 6 to apply the liquid or Lacquers 4 in the area of the painting head 49 or the substrate 2 shown.
  • the feed device 6 is made from a horizontal with reference to Figures 3 and 4 Carrier 8, the one in the drawing not shown bracket or on a housing is arranged.
  • the bracket 8 has an approximately box-shaped, formed from side parts 76 'to 76' '' ' Housing in which a drive device 3 with a stepper motor 9 for driving a transmission or rack or worm screw gear 15 is provided.
  • the stepper motor 9 thus drives over that Gear 15, the feed device 6, so that this can be adjusted parallel to the surface of the substrate 2 can.
  • the support device 8 consists of a reference on the support arm 8 vertically extending part with a holder 68 provided at the upper end for receiving a supply line 17, at the upper end of which Nozzle 5 is connected so that the paint 4 can be delivered to the substrate 2.
  • the supply line 17 is via lines 47, the heater 39 and the line 46 and the pump 29 to the lower container 31 connected.
  • the carrying device 8 a first link guide 7, which consists of a horizontally extending part 11, an adjoining, inclined part 12 and a in turn, also horizontally extending part 13 is formed for inclusion serve of sliding elements or roller bearings 10.
  • a first link guide 7 which consists of a horizontally extending part 11, an adjoining, inclined part 12 and a in turn, also horizontally extending part 13 is formed for inclusion serve of sliding elements or roller bearings 10.
  • the feed device 6 in the position according to Figure 3, it has its lower position or position ingested, in which the nozzle 5 paint to the substrate 2 can deliver.
  • the paint application via the nozzle 5 begins on the inside diameter of the substrate 2, so that by the rotational movement of the substrate carrier 14 medium dispensed onto the substrate 2 with the nozzle 5 or the paint evenly distributed outwards and the The rest is caught over the painting head 49.
  • the horizontal extending part 11 of the guide 7 is advantageously as large as the corresponding one Painting radius of different substrate shapes, see above that there is a possibility with anyone Diameter to coat the substrate without varnish that when adjusting the feed device 6 the distance between the lower end of the nozzle 5 and the surface of the substrate 2 is changed. That way the drop height of the paint emerging from the nozzle 5 is constant kept and ensured that a even paint application.
  • the lower, horizontally running part 13 of the link guide 7 also ensures that the Stepper motor 9 an exact positioning of the nozzle 5 any place above the substrate 2 possible regardless of where the paint is applied on the surface of the substrate 2.
  • the output from the substrate carrier 14, liquid medium or the paint 4 over guide elements 19, 20 at least to the first container 27 are emitted with at least one filter 28 from which the liquid is directly or indirectly via a pump 29 to the first container 27 is passed, between the first drain line 33 of the first container 27 and the Pump 29 a negative pressure via a Venturi nozzle Pump 30 is adjustable.
  • the vacuum pump 30 is connected to a return device 32 connected from lines 33, 59 and 39 and the filter 28.
  • the vacuum pump 30 protrudes a line 44 with the second container 31 in Connection.
  • the spun off from the substrate carrier 14 Liquid or the liquid paint medium is over the first container 27 passed to the first filter 28, the return device 32 to the vacuum device or the venturi tube 44 is connected via which the negative pressure is generated becomes.
  • This also allows liquid medium or Move high viscosity paint through the filter system and the desired purity for the liquid achieve trouble-free production operations. Due to the vacuum operation can also filter 28 with very fine mesh Filter elements 28 are used without this the throughput time of the lacquer in the entire device is adversely affected. Because of the advantageous Such filters can be used for the vacuum operation 28 can also remain in use much longer because next to the pump 29 in connection with the vacuum a high flow rate of the coating liquid is ensured.
  • Vacuum pump 30 connected to the collecting container 31.
  • Vacuum pump 30 may be any other suitable one Place between the first container 27 and the pump or metering pump 29 can be connected.
  • the Metering pump 29 is via a control valve 73 of the feedback device 32 can be activated.

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  • Coating Apparatus (AREA)
  • Manufacturing Of Magnetic Record Carriers (AREA)

Claims (16)

  1. Dispositif pour effectuer un revêtement de surface ou pour vernir des substrats ou des substrats (2) discoïdes, tel qu'un support d'information discoïde, sur un support de substrat (14), sur le substrat (2) étant appliqués des fluides liquides ou le liquide de vernissage (4) à appliquer, ceci par l'intermédiaire d'un dispositif d'alimentation (6),
       le fluide liquide à fournir du substrat (2) ou bien le vernis (4) étant délivré au moins à un premier récipient (27) relié à au moins un filtre (28) d'où le liquide est dirigé indirectement ou directement par une pompe (29) vers un deuxième récipient (27) et/ou de nouveau au premier récipient (27), caractérisé en ce que dans le circuit de liquide, entre une première conduite d'évacuation (33) du premier récipient (27) et un deuxième récipient (31) ou/et la pompe (29), une pompe à vide (30) est intégrée au circuit de liquide ou raccordée au dispositif.
  2. Dispositif selon la revendication 1, le support de substrat (14) étant susceptible d'être entraíné en rotation par l'intermédiaire d'un dispositif d'entraínement (3).
  3. Dispositif selon la revendication 1 ou 2, entre le filtre (28) et la pompe (29), étant raccordé le deuxième récipient (31) devant contenir le fluide liquide (4) et la pompe à vide (30) est raccordée à un dispositif de recirculation (32).
  4. Dispositif selon l'une ou plusieurs des revendications précédentes, où la pompe à vide (30) est raccordée au deuxième récipient (31) devant contenir le fluide liquide (4).
  5. Dispositif selon la revendication 4, où la pompe à vide (30) est réalisée sous la forme de buse venturi.
  6. Dispositif selon l'une ou plusieurs des revendications précédentes, où le premier dispositif (27) est relié à un filtre (28) par une conduite à liquide (33) et à une première soupape (34) interrompant l'amenée au filtre (28).
  7. Dispositif selon l'une ou plusieurs des revendications précédentes, où le premier récipient (27) est susceptible d'être relié par une conduite à liquide (33, 59) et une première soupape (34) au filtre (28) et le filtre (28) est susceptible d'être relié au réservoir (35) par une deuxième soupape (36).
  8. Dispositif selon l'une ou plusieurs des revendications précédentes, où une soupape d'isolement (37) est prévue entre le filtre (28) et le deuxième récipient (31).
  9. Dispositif selon l'une ou plusieurs des revendications précédentes, où un clapet anti-retour (38) est prévu entre le deuxième récipient (31) et la pompe (29).
  10. Dispositif selon l'une ou plusieurs des revendications précédentes, où le fluide liquide ou le vernis (4) transporté par la pompe (29) est relié par un dispositif de chauffage (39) à une buse (5) du dispositif d'alimentation (6).
  11. Dispositif selon l'une ou plusieurs des revendications précédentes, où le substrat (2) ou le support de substrat (14) sont réglables à l'aide d'un dispositif de guidage ou dans un guidage à coulisse (7) de manière que le dispositif d'alimentation (6) devant appliquer le fluide liquide ou le vernis (4) soit guidé dans la zone du substrat (2) à peu près parallèlement à la surface de ce substrat (2) et puisse être immobilisé en un endroit quelconque au-dessus du substrat (2).
  12. Dispositif selon l'une ou plusieurs des revendications précédentes, où le dispositif d'alimentation (6) est relié au dispositif d'entraínement (3) et est supporté par un dispositif porteur (8).
  13. Dispositif selon la revendication 11 ou 12, où le dispositif d'alimentation (6) est réglable en direction horizontale et/ou en direction verticale à l'aide du dispositif de guidage (7).
  14. Dispositif selon l'une ou plusieurs des revendications précédentes, où le dispositif d'entraínement (3) est relié fonctionnellement à un moteur pas-à-pas (9).
  15. Dispositif selon la revendication 14, où un moteur pas-à-pas (9) électrique ou électronique-hydraulique est prévu.
  16. Dispositif selon la revendication 14 ou 15, où le moteur pas-à-pas (9) est relié fonctionnellement au dispositif de guidage (7) par l'intermédiaire d'une transmission à engrenage ou d'une transmission à crémaillère ou à vis (15).
EP97101696A 1996-02-15 1997-02-04 Dispositif pour revêtir des substrats Expired - Lifetime EP0790081B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19605602 1996-02-15
DE19605602A DE19605602C1 (de) 1996-02-15 1996-02-15 Vorrichtung zur Oberflächenbeschichtung bzw. zum Lackieren von Substraten

Publications (3)

Publication Number Publication Date
EP0790081A2 EP0790081A2 (fr) 1997-08-20
EP0790081A3 EP0790081A3 (fr) 1998-07-15
EP0790081B1 true EP0790081B1 (fr) 2003-07-02

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP97101696A Expired - Lifetime EP0790081B1 (fr) 1996-02-15 1997-02-04 Dispositif pour revêtir des substrats

Country Status (3)

Country Link
US (1) US5766359A (fr)
EP (1) EP0790081B1 (fr)
DE (2) DE19605602C1 (fr)

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DE3211597C2 (de) * 1982-03-30 1984-10-18 Wilhelm Dipl.-Ing. 6053 Obertshausen Heinz Unterdruck-Absaugvorrichtung
JPS62129178A (ja) * 1985-11-29 1987-06-11 Canon Inc 薬液供給装置用薬液回収装置
EP0334535A3 (fr) * 1988-03-23 1990-12-05 PIRELLI GENERAL plc Fabrication de câble électrique
DE4121032A1 (de) * 1991-06-26 1993-01-07 Schmid Gmbh & Co Geb Vorrichtung zum behandeln von plattenfoermigen gegenstaenden, insbesondere leiterplatten
JP2982439B2 (ja) * 1991-10-29 1999-11-22 東京エレクトロン株式会社 処理液塗布装置及び処理液塗布方法
DE4221367C1 (en) * 1992-06-29 1993-06-17 Thomas 7300 Esslingen De Hammerer Applicator for paint to surfaces - has container for filter insert and sediment collection between mixer and pump
DE29512500U1 (de) * 1995-08-03 1995-10-12 Leybold Ag Vorrichtung zum Lackieren eines flachen, kreisscheibenförmigen Substrats, insbesondere einer CD

Also Published As

Publication number Publication date
EP0790081A2 (fr) 1997-08-20
EP0790081A3 (fr) 1998-07-15
DE19605602C1 (de) 1997-11-20
DE59710358D1 (de) 2003-08-07
US5766359A (en) 1998-06-16

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