EP1024904A1 - Device for applying a thin coat on the surface of a screen of a cathode-ray tube - Google Patents
Device for applying a thin coat on the surface of a screen of a cathode-ray tubeInfo
- Publication number
- EP1024904A1 EP1024904A1 EP98955473A EP98955473A EP1024904A1 EP 1024904 A1 EP1024904 A1 EP 1024904A1 EP 98955473 A EP98955473 A EP 98955473A EP 98955473 A EP98955473 A EP 98955473A EP 1024904 A1 EP1024904 A1 EP 1024904A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coated
- receptacle
- process pot
- pot
- held
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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
- B05C11/02—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
Definitions
- the present invention relates to a device for applying a thin layer of a liquid coating medium to a preferably curved surface of an object, preferably a glass flask, according to the preamble of claim 1.
- the screen glass bulb for example, is inserted into the process pot from the underside and pressed against a mask which delimits the surface to be coated and which is intended to prevent the coating medium from reaching undesired areas of the glass bulb.
- This way of feeding and discharging the Screen glass flask is mechanically complex and cumbersome.
- the screen glass bulb is introduced into the process pot from the top and an opened, divided mask is brought into its closed position around the boundary edge of the surface to be coated. This is also mechanically complex because of the split mask to be moved.
- both known devices described have in common that streaks and other discontinuities in the coating form in particular at the edges of the surface to be coated, unless special measures are taken to improve the uniformity of the coating.
- air guiding elements attached to the corners of the mask are to be used in the known devices. Nevertheless, such measures do not prevent the flow from breaking off at the peripheral edges and eddy formation occurring, which in turn leads to contamination of the object to be coated with the coating medium in undesired areas.
- the object of the present invention is to provide a device for applying a thin layer to a surface to create an object of the type mentioned, which is easier to handle when inserting and removing the object to be coated and which offers a considerably improved uniformity of the layer in the critical corner and edge areas of the surface to be coated.
- the measures according to the invention result in an air flow which, on the one hand, due to its different air velocities in different areas, makes the layer to be applied even in the edge and corner areas of the preferably curved surface, and on the other hand avoids contamination of other areas of the object to be coated.
- the laminar flow in the area of the corners and edges of the preferably curved surface to be coated and the suction applied to them pointing towards the suction cone and the resulting downward flow component prevent the air flow from breaking off at the corners and edges of the surface and thus the formation of eddies to the avoid other splashes on the surface to be coated.
- a low-build process pot is achieved, which in its lower area surrounds the neck of the screen glass bulb, for example.
- the outflow or suction of the coating medium mist and / or the coating medium droplets is advantageously achieved.
- the features according to claim 6 are provided. Expedient refinements for this result from the features of one or more of claims 7 to 9. What is achieved is that the splash ring can be lowered to or below the level of the support of the object on the receptacle, so that the object to be coated can be easily removed can be gripped and moved through the splash ring.
- a receptacle suitable for a specific dimension of the object to be coated can be taken out of the process pot and replaced by a receptacle that can accommodate an object to be coated with other dimensions.
- Preferred refinements for this result from the features of one or more of claims 11 to 13.
- a complete unit consisting of a turntable, receptacle, suction cone and sealing sleeve is thus removed from the process pot in a particularly advantageous manner and by another replaced.
- the spray ring can be easily removed from the upper part of the process pot.
- the features are provided according to claim 14, whereby a simple sealing of the surface to be coated of the object to be coated is achieved with respect to the other areas of the object to be coated. If the features are provided according to claim 15, a resiliently biased active contact of the sealing sleeve on the shoulder of the object to be coated is achieved.
- the resilient pretension can be achieved by a concave curvature of the sealing sleeve or by a kink provided along a circumferential line.
- the features according to claim 17 are expediently provided for stabilizing the sealing collar, so that the resilient bias is transferred from a lower part to the actual sealing element.
- the features can be provided according to claim 18.
- the features are provided according to claim 19, with which a quick and simple rotationally fixed connection between the object to be coated and the receptacle is achieved.
- E.g. are screen glass flasks on their circumference with a strap and attached mounting tabs that be used for the aforementioned rotationally fixed connection with the bolts of the mounting plates.
- the object to be coated on its surface is out of round, such as, for example, in the case of a screen glass bulb, when viewed from above, it is provided with rounded corners in a rectangular manner, the corners outside the inner circle collide with the still air, so that a strong swirl and a swirl in these corner areas Shear flows occur which remove the paint that is spread outwards by the centrifugal coating.
- the features according to claim 20 are provided in one variant.
- the mudguard device Since essentially only the corner areas are endangered in this respect, it is sufficient to subdivide the mudguard device in accordance with the features of claim 21. It is expedient to provide the features according to claim 22, since the side leading in the direction of rotation with respect to the corner region works against the still air, while the trailing side lies in the slipstream, so to speak. With the aid of the mudguard device or the individual mudguards, the air turbulence can be kept away from the surface to be coated, for example the screen surface, so that an unobstructed coating in the area of the corners is made possible.
- retaining tabs are provided on the corner of the tensioning band.
- a tool for example a robot
- FIG. 1 shows a schematic longitudinal section of a device for applying a thin layer of a liquid coating medium to a curved surface of a screen glass bulb in the coating position according to a preferred exemplary embodiment of the present invention
- FIG. 2 shows a representation corresponding to FIG. 1, but in a position for changing the screen glass bulb to be coated
- FIG. 3 shows a schematic top view according to arrow III in FIG. 1,
- Figure 4 in a schematic longitudinal sectional view of an interchangeable unit for Screen glass flasks of different dimensions
- FIG. 5 shows an enlarged view of a section according to circle V of FIG. 4.
- FIG. 6 shows an enlarged view of a section according to circle IV of FIG. 1, but according to a variant
- FIG. 7 shows a representation corresponding to FIG. 5 with the variant according to FIG. 6.
- the device 10 shown in the drawing in accordance with a preferred exemplary embodiment is used to apply a thin layer of a liquid coating medium to a curved surface 12 of an object shown here in the form of a screen glass bulb 11.
- the coating medium is applied in a customary manner via a spray arm, not shown here, over the surface 12 and by centrifugal force distribution of the coating medium along the surface 12 to be coated or by spinning off the remaining coating medium due to a rotational movement of the glass screen flask 11 coating
- Surface 12 of the screen glass bulb 11 is driven at a relatively low speed, while for centrifugal force distribution or for throwing off the coating medium along the surface 12 or beyond, the speed at which the screen glass bulb 11 is rotated is substantially increased.
- the screen glass flasks 11 to be coated are provided on their head 13 with a tensioning band 14, on which holding tabs 15 are provided distributed over the circumference, which serve both for holding in the device 10 and for later holding in a device housing.
- the screen glass bulb 11 has a neck 16 facing away from the head 13 provided with the surface 12 to be coated.
- the device 10 has a receptacle 30 for the screen glass bulb 11 and a turntable 20 to which the receptacle 30 is connected in a rotationally fixed manner.
- Turntable 20 and receptacle 30 are surrounded by a rotationally symmetrical process pot 50 which is held non-rotatably and which holds an upper spray ring 60 on its axially lowerable head part 51.
- the turntable 20 is easily detachably connected to a flange 21 of a hollow shaft 22.
- the hollow shaft 22 is is rotatably held on a concentric, fixed, hollow axle 23 via roller bearings 24 and has a pulley 25 at its end remote from the flange 21, which is coupled via a drive belt 26 to the output shaft of a drive motor 27, not shown in more detail.
- the hollow axis 23 projects perpendicularly from a device base 28.
- the turntable 20 is releasably connectable to the flange 21 via quick release elements 29, not shown.
- the process pot 50 has an upper cylindrical pot part 52, within which the head part 51 can be lowered, and a lower annular pot part 53, the annular space of which is closed off by an annular base 54.
- the lower annular pot part 53 begins below the turntable 20 and has an inner ring flange 55 which surrounds the flange 21 of the hollow shaft 22 at a radial distance below the turntable 20.
- the process pot 50 is held by its ring base 54 on legs 56 which are distributed over the circumference and protrude perpendicularly from the base 28.
- the ring base 54 is connected at least at one point via an opening to a suction nozzle 57, to which a suction device is connected indirectly or directly in a manner not shown.
- the ring base 54 is inclined radially towards the suction nozzle 57 and extends from a highest one Place down in both circumferential directions towards the suction nozzle 57.
- the head part 51 of the process pot 50 can, for example, be lowered hydraulically into the upper cylindrical pot part 52 and has an upper outer flange 58.
- the head part 51 can be pulled out of the upper cylindrical pot part 52 or can be removed from it in a manner not shown.
- the splash ring 60 has a rotationally symmetrical hood-shaped insert 61 which is held detachably on the head part 51 of the process pot 50 by means of holders 62, three of which, for example, are arranged uniformly distributed over the circumference.
- the holders 62 are fastened to a cone part 63, which merges downwards into a cylindrical part 64, along the circumference of a central opening 65 of the splash ring insert 61 delimited by the cone part 63.
- the holders 62 hang with an arm 66 in a recess 59 of the outer flange 58 of the head part 51.
- a first narrow annular gap 67 is formed between the cylindrical part 64 of the spray ring insert 61 which is suspended from the head part 51 and the inner periphery of the head part 51 of the process pot 50.
- the receptacle 30 has a box-shaped receptacle part 31, the rectangular shape of which in plan view corresponds approximately to the outer dimensions of the head 13 of the screen glass bulb 11.
- the receiving part 31 sits on the top of the turntable 20 and is rotatably connected to it.
- a suction cone 32 is provided in the region of its lower end in a rotationally fixed manner.
- the suction cone 32 has a circumferential flange 33 fastened to the receiving part 31, on which a hood-like cone part 34 is held, which merges at the end into a cylinder part 35.
- the outer diameter of the cylinder part 35 extending towards the ring base 54 of the process pot 50 is such that a second annular gap 37 exists between the outer circumference and the inner circumference of the lower annular pot part 53 of the process pot 50.
- the cylinder part 35 of the receptacle 30 ends at a certain distance from the ring base 54 of the process pot 50.
- a relaxation space 36 is formed inside the cylinder part 35, which is delimited radially inward from the wall of the cylinder part 35 by a sheet metal sleeve 38, which is on the underside of the Turntable 20 is held in a rotationally fixed manner and a third narrow annular gap 39 is formed between and the inner wall of the lower annular pot part 53.
- a central opening in the bottom 72 of the receptacle 30 is followed by a tube 73, closed at the bottom and projecting downwards, for receiving a thin end 18 of the glass bulb 11.
- the receptacle 30 or its receptacle part 31 has an upper circumferential end face 41, on which a sealing sleeve 40 for the head 13 of the display glass bulb 11 is fastened.
- the sealing collar 40 has an elastically resiliently biased lower part 42, a flat seal 43 and a holding part 44.
- the elastically resiliently biased lower part 42 is either curved or bent upwards in a radially inner region.
- the lower part 42 which supports the flat seal 43 and, due to its curvature, partially lifts off the end face 41, projects somewhat beyond the inner edge of the receiving part 31, while the flat seal 43 is drawn even further radially inwards.
- the holding part 44 is considerably narrower, ie it is located beyond the curved area of the lower part 42 only in the clamping area in which the sealing sleeve 40 is held in place by means of screws, inter alia, of plate-like components 45 arranged distributed over the rectangular periphery.
- the plate-shaped component 45 which is notched in the arched inner region of the sealing collar 40 is fitted away from the fastening on the receiving part 31 with a bolt 46 which projects upwards and is provided with an annular collar 47, on which bolt 46 the screen glass bulb 11 is suspended by means of the retaining tabs 15 held on the tensioning strap 14 is.
- the lower forehead 17 of the retaining tab 15 presses on the Inner edge of the flat gasket 43, so that the space 48 below the head 13 of the screen glass bulb 11 or below the sealing sleeve 40 is sealed against the coating medium.
- the mode of operation of the device 10 is as follows: According to FIG. 1, the device 10 is acted upon by a laminar flow which extends over the entire surface of the process pot 50 according to the arrows A, the laminar flow having a speed of, for example, approximately 0.3 to 0.4 m / s.
- a suction flow according to arrow B is generated in the suction nozzle 57 of the process pot 50.
- the laminar flow A passes through the central opening 65 onto the surface 12 to be coated of the display glass bulb 11 and past it into a passage 71 between the edges and corners of the display glass bulb 11 and the cone part 63 of the spray ring 60.
- the laminar flow A arrives in the first annular gap 67 between the spray ring insert 61 and the process pot head part 51.
- the partial flow through the first annular gap 61 is brought to a flow speed between, for example, approximately 7 and 10 m / s, so that at the exit of the annular gap 67 suction is exerted on the partial flow in the passage 71.
- This overall prevailing laminar flow leads to a very high uniformity of the resulting layer even in the corner and edge areas of the glass bulb 11, so that streaks or the like.
- the area of the upper spray ring 60 and the first annular gap 7 between the process pot 50 and the upper spray ring 60 as well as the area between the screen receptacle 30 and the upper spray ring 60 are dimensioned such that a downward flow component with air velocities between 7 to 10 m is arranged on the circumference of the process pot 50 / s is generated. This also prevents back splashes on the object 11.
- the free volume between screen receptacle 30 and process pot 50 is selected such that at spin speeds of up to 250 rpm there is no significant dynamic pressure in the area between the upper edge of screen 11 and suction cone 32.
- the stream now enriched or atomized with coating medium passes through the second annular gap 37 between the process pot 50 and the suction cone 32.
- This second annular gap 37 is selected such that there is a Flow speed of, for example, 3 to 5 m / s is reached, so that there is an effective suction of the atomized coating medium from the upper critical area.
- the downward flow continues, it flows out of the second annular gap 37 into the relaxation space 36, in which the incoming coating medium mist is calmed by reducing the flow velocity to about 0.6 to 0.9 m / s.
- the head part 51 of the process pot 50 is lowered together with the spray ring 60 according to FIG. 2, so that the glass bulb 11 is gripped on, for example, the holding tabs 15 with the aid of gripper arms (not shown) removed or another glass bulb 11 can be used in a corresponding manner.
- the device 10 can be adapted in such a way that the unit 70 shown in FIG. 4, comprising the turntable 20 and the receptacle 30 with the sealing collar 40, is replaced.
- the spray ring 60 is removed from the head part 51 or, depending on the diameter relationships between the head part 51 and the suction cone 32 of the receptacle 30, the head part 51 with the spray ring 60 may be removed from the process pot 50.
- the device 10 has a fender device 80 which is arranged around the head region 13 of the glass bulb 11.
- the mudguard device 80 is upright and essentially parallel to the axis of rotation of the turntable and thus the axis of the screen glass bulb 11 and extends from a region at the height of the lower edge of the tensioning band 14 up to a height range of a few centimeters, for example 5 cm above the Zenith of the curved surface 12 of the glass bulb 11 ( Figure 7).
- the mudguard device 80 consists of several, here four individual mudguards 81, each of which mudguard 81 is arranged in the region of a corner 82 of the head 13 of the glass bulb 11.
- the mudguard 81 is in one piece and has a plurality of partial areas 83, 84 and 85. While the lateral partial areas 83 and 35 extend in a straight line at a small distance along the relevant sides of the head 13 or the tensioning strap 14, the central partial area 84 is shaped like a baffle, that it surrounds the holding tab 15, so that a free space 86 is created within the central partial area 84, free access to the holding tab 15 by means of a tool or robot for inserting and removing the object 11 into and out of the device 10 from above allowed. In the illustrated embodiment, this shape 84 is rectangular; it goes without saying that they are also circular or the like. can be.
- That portion 83 of the mudguard 81 that leads in the direction of rotation C of the turntable 20 is significantly longer than that portion 85 that trails in the direction of rotation mentioned.
- the leading section 83 extends over more than half the length of the relevant side of the head 13, while the trailing section 85 extends only over a small, for example a quarter of the length of the relevant side of the head 13.
- the individual mudguards are provided in each partial area, that is to say also in the central partial area, running linearly along the outer edge of the head 13.
- the individual mudguards can be moved or pivoted in such a way that access to the holding tabs 15 can be released. E.g. this can be done in such a way that the leading portion of the mudguard is pivoted at its free end.
Landscapes
- Coating Apparatus (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Formation Of Insulating Films (AREA)
- Electronic Switches (AREA)
- Formation Of Various Coating Films On Cathode Ray Tubes And Lamps (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19748063 | 1997-10-31 | ||
DE19748063A DE19748063A1 (en) | 1997-10-31 | 1997-10-31 | Device for applying a thin layer on the surface of a display glass bulb |
PCT/EP1998/006586 WO1999022877A1 (en) | 1997-10-31 | 1998-10-17 | Device for applying a thin coat on the surface of a screen of a cathode-ray tube |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1024904A1 true EP1024904A1 (en) | 2000-08-09 |
EP1024904B1 EP1024904B1 (en) | 2002-12-04 |
Family
ID=7847171
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98955473A Expired - Lifetime EP1024904B1 (en) | 1997-10-31 | 1998-10-17 | Device for applying a thin coat on the surface of a screen of a cathode-ray tube |
Country Status (8)
Country | Link |
---|---|
US (1) | US6494952B1 (en) |
EP (1) | EP1024904B1 (en) |
CN (1) | CN1106231C (en) |
AT (1) | ATE228892T1 (en) |
DE (2) | DE19748063A1 (en) |
MY (1) | MY126403A (en) |
TW (1) | TW409076B (en) |
WO (1) | WO1999022877A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20010101828A (en) * | 1999-12-10 | 2001-11-14 | 요트.게.아. 롤페즈 | Method and device for providing a layer of coating material on the inner side of a display window for a color display tube |
JP4117843B2 (en) * | 2003-12-25 | 2008-07-16 | オリジン電気株式会社 | Spin coat equipment |
CN102627408A (en) * | 2012-04-13 | 2012-08-08 | 安徽鑫昊等离子显示器件有限公司 | Size coating device of plasma panel display screen |
DE102017212887A1 (en) | 2017-07-26 | 2019-01-31 | Gebr. Schmid Gmbh | Method, device and system for printed circuit board production |
CN111864102A (en) * | 2020-07-07 | 2020-10-30 | 武汉华星光电半导体显示技术有限公司 | Display panel and manufacturing method thereof |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2653429B2 (en) * | 1986-10-16 | 1997-09-17 | 株式会社東芝 | Bulb holder for cathode ray tube |
KR920000328B1 (en) * | 1988-09-29 | 1992-01-11 | 미쯔비시덴끼 가부시끼가이샤 | Method for manufacturing anti-static cathode ray tubes |
US5234499A (en) * | 1990-06-26 | 1993-08-10 | Dainippon Screen Mgf. Co., Ltd. | Spin coating apparatus |
US5626913A (en) * | 1994-03-09 | 1997-05-06 | Tokyo Electron Limited | Resist processing method and apparatus |
JPH0869752A (en) * | 1994-08-30 | 1996-03-12 | Nec Kansai Ltd | Spin coating device |
JP3257340B2 (en) * | 1995-05-24 | 2002-02-18 | 松下電器産業株式会社 | Liquid coating method, liquid coating apparatus and slit nozzle |
US5688328A (en) * | 1995-09-13 | 1997-11-18 | Chunghwa Picture Tubes, Ltd. | Apparatus for improved coating of a CRT display screen |
US5985031A (en) * | 1996-06-21 | 1999-11-16 | Micron Technology, Inc. | Spin coating spindle and chuck assembly |
-
1997
- 1997-10-31 DE DE19748063A patent/DE19748063A1/en not_active Withdrawn
-
1998
- 1998-10-17 AT AT98955473T patent/ATE228892T1/en not_active IP Right Cessation
- 1998-10-17 DE DE59806563T patent/DE59806563D1/en not_active Expired - Fee Related
- 1998-10-17 US US09/529,413 patent/US6494952B1/en not_active Expired - Fee Related
- 1998-10-17 EP EP98955473A patent/EP1024904B1/en not_active Expired - Lifetime
- 1998-10-17 CN CN98810748A patent/CN1106231C/en not_active Expired - Fee Related
- 1998-10-17 WO PCT/EP1998/006586 patent/WO1999022877A1/en active IP Right Grant
- 1998-10-30 TW TW087118058A patent/TW409076B/en not_active IP Right Cessation
- 1998-10-30 MY MYPI98004957A patent/MY126403A/en unknown
Non-Patent Citations (1)
Title |
---|
See references of WO9922877A1 * |
Also Published As
Publication number | Publication date |
---|---|
US6494952B1 (en) | 2002-12-17 |
DE19748063A1 (en) | 1999-05-06 |
TW409076B (en) | 2000-10-21 |
DE59806563D1 (en) | 2003-01-16 |
ATE228892T1 (en) | 2002-12-15 |
MY126403A (en) | 2006-09-29 |
CN1278194A (en) | 2000-12-27 |
WO1999022877A1 (en) | 1999-05-14 |
EP1024904B1 (en) | 2002-12-04 |
CN1106231C (en) | 2003-04-23 |
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