EP0014004A1 - Process for making the luminescent stripes on a screen of a colour display tube - Google Patents
Process for making the luminescent stripes on a screen of a colour display tube Download PDFInfo
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- EP0014004A1 EP0014004A1 EP80200003A EP80200003A EP0014004A1 EP 0014004 A1 EP0014004 A1 EP 0014004A1 EP 80200003 A EP80200003 A EP 80200003A EP 80200003 A EP80200003 A EP 80200003A EP 0014004 A1 EP0014004 A1 EP 0014004A1
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- light
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- 238000000034 method Methods 0.000 title claims abstract description 36
- 239000011521 glass Substances 0.000 claims abstract description 8
- 238000009826 distribution Methods 0.000 claims abstract description 4
- 230000001419 dependent effect Effects 0.000 claims abstract 7
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 230000035699 permeability Effects 0.000 claims 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 abstract description 5
- 230000005540 biological transmission Effects 0.000 description 8
- 239000004071 soot Substances 0.000 description 2
- 108010010803 Gelatin Proteins 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 229920000159 gelatin Polymers 0.000 description 1
- 239000008273 gelatin Substances 0.000 description 1
- 235000019322 gelatine Nutrition 0.000 description 1
- 235000011852 gelatine desserts Nutrition 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
- H01J9/20—Manufacture of screens on or from which an image or pattern is formed, picked up, converted or stored; Applying coatings to the vessel
- H01J9/22—Applying luminescent coatings
- H01J9/227—Applying luminescent coatings with luminescent material discontinuously arranged, e.g. in dots or lines
- H01J9/2271—Applying luminescent coatings with luminescent material discontinuously arranged, e.g. in dots or lines by photographic processes
- H01J9/2272—Devices for carrying out the processes, e.g. light houses
- H01J9/2273—Auxiliary lenses and filters
Definitions
- the invention relates to a method for producing fluorescent screens for color picture tubes, in which a light-sensitive layer is exposed through the shadow mask of the tube.
- FIG. 1 A device for carrying out such a method is shown in FIG. 1 in its essential components.
- a light-sensitive phosphor layer 2 On the front glass 1 there is a light-sensitive phosphor layer 2, which is illuminated by the light mask 4 through the shadow mask 3.
- the light rays are designated 5.
- the beam path of the light is simulated by a lens 6 so that it corresponds to the path of the electron beams in the finished tube.
- Fluorescent strips of essentially constant width are to be achieved on the screen. However, the transparency of the mask changes significantly e.g. from their center to the edge.
- the thickness and temperature of the light-sensitive phosphor layer cast using the shielding process depend on the location of the screen. All of this means that a filter 7 is also used, which is arranged on the lens 6 or directly below it, or, as shown in FIG. 1, directly above it fluctuating width can be achieved. As a rule, the transparency of the filter is considerably higher at the edge than in the middle.
- the filter usually consists of a gelatin-soot layer on glass.
- the production of such a layer is described in detail in DE-OS 20 36 684.
- fluorescent strips When exposed through such a filter, fluorescent strips are included, the width compliance of which is completely satisfactory, but are the edges of the strips are fairly torn, which in unfavorable cases gives rise to considerable fluctuations in color when the tube is in operation, for example in a uniform white image.
- the exposure time is considerably shortened in the method according to the invention, since the main amount of light is applied without a light-reducing filter.
- the total exposure time for both process steps is less than half compared to the previously known process.
- FIG. 2 shows the amount of light applied during exposure as a function of the location of the screen.
- the amount of light is measured at the location of the screen, i.e. seen from behind the shadow mask from the light source.
- the amount of light M 1 is applied in the middle M of the screen.
- the amount of light applied is D 1 .
- This is less than M1 because point D is farther away from the illumination source than M and because the mask transparency decreases sharply away from center M.
- Progressing on a diagonal from M to D results in the dependency of the quantity of light applied in the first method step on the shield location, shown in dashed lines on the right.
- the amount of light as it progresses is plotted on a vertical line from the center M to a point V furthest from M in the vertical direction.
- the smallest amount of light overall must be applied in the middle. Higher amounts of light, depending on the location of the screen, should be applied to the outside. The additional amounts of light are added in the second process step.
- the total amount of light M i required corresponds to the amount of light M 1 supplied in the first method step.
- the amount of light D i - D 1 is still missing for the total required light quantity D i after the first method step.
- the exemplary embodiment relates to the exposure of the green phosphor.
- the exposure time is 20 seconds.
- the transmission of the filter used is approximately 10% in the middle.
- exposure is carried out for 1.8 seconds in the first process step, completely without a filter, ie with 100% transmission. This means that 90% of the total amount of light required is applied.
- This exposure without a filter produces excellent, sharp-edged strips, but with an unsatisfactory width distribution.
- a filter is brought into the beam path, which has 3% transmission in the middle and has such a transmission that increases from the center that the correct stripe widths are obtained after exposure of the second process section. Thieves The edge of the strips deteriorates only marginally during this second partial exposure and is overall considerably better than if, as before, the entire amount of light is irradiated through a filter.
- the exposure time of the second step is 6 - 7 seconds. In total, 8 - 9 seconds are exposed instead of 20 seconds as before.
- the exemplary embodiment deviates from the principle of FIG. 2 in that, in FIG. 2, the total amount of light required is applied in the middle in the first step and is only corrected outside the center in the second method step. In the exemplary embodiment, however, only 90% of the required amount of light is supplied in the middle in the first step and the remaining 10% in the second. This is due to the fact that it would be possible only with great effort to produce filters with transmission zero in the middle and with a defined transmission curve to the outside. As mentioned above, the filter used has 3% transmission in the middle, which is why in the second process step in the practical example, light is still supplied in the middle.
- the filter used can e.g. can be produced by one of the processes described in detail in DE-OS 20 36 684 or DE-OS 20 59 135.
- Exposure in two steps can advantageously be achieved by exposing twice on the same exposure device, but in the first step without a filter and in the second step with the filter inserted or screwed into the beam path.
- the front glass to be exposed is conveyed from a first exposure device without a filter, on which the first exposure step takes place, to a second exposure device with a filter.
- the filter can be made of other materials besides gelatin black. It can also be a filter in which the transmission ver hold by different numbers of equally wide opaque areas per area or differently wide opaque areas. Apertures pushed into the beam path with different durations can also be used. In this case, it is particularly advantageous to use a rotating diaphragm with a diaphragm cut-out through which the correcting intensity distribution required in the second exposure step is realized.
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Formation Of Various Coating Films On Cathode Ray Tubes And Lamps (AREA)
Abstract
Eine durch Licht aushärtbare, auf das Frontglas (1) einer Farbbildröhre aufgebrachte, Leuchtstoff enthaltende Schicht (2) wird in zwei Verfahrensschritten belichtet, um eine ortsabhängige Belichtungsmenge zum Erzeugen scharf berandeter Leuchtstoffstreifen mit nur geringen Breiteschwankungen zu erzielen. In einem ersten Verfahrensschritt wird der Hauptteil der zur Aushärtung erforderlichen Lichtmenge ohne Einwirkung auf die ortsabhängige Lichtmengenverteilung eingestrahlt, und in einem zweiten Verfahrensschritt wird im wesentlichen die an der erforderlichen Gesamtlichtmenge noch fehlende ortsabhängige Lichtmenge eingestrahlt.A light-curable, phosphor-containing layer (2) applied to the front glass (1) of a color picture tube is exposed in two process steps in order to achieve a location-dependent exposure amount for producing sharply edged phosphor strips with only slight fluctuations in width. In a first process step, the main part of the light quantity required for curing is irradiated without affecting the location-dependent light quantity distribution, and in a second process step essentially the location-dependent light quantity still lacking in the required total light quantity is irradiated.
Description
Die Erfindung betrifft ein Verfahren zur Herstellung von Leuchtschirmen, für Farbbildröhren, bei dem eine lichtempfindliche Schicht durch die Schattenmaske der Röhre hindurch belichtet wird.The invention relates to a method for producing fluorescent screens for color picture tubes, in which a light-sensitive layer is exposed through the shadow mask of the tube.
Bei einem solchen Verfahren, wie es z.B. in der DE-OS 24 40 575 beschrieben ist, sollen Leuchtstoffstreifen mit nur innerhalb geringer Grenzen schwankender Streifenbreite erzielt werden. Eine Vorrichtung zur Durchführung eines solchen Verfahrens ist in Figur 1 in ihren wesentlichen Bauteilen dargestellt. Auf dem Frontglas 1 befindet sich eine lichtempfindliche Leuchtstoffschicht 2, welche durch die Schattenmaske 3 von der Lichtquelle 4 beleuchtet wird. Die Lichtstrahlen sind mit 5 bezeichnet. Durch eine Linse 6 wird der Strahlengang des Lichts so nachgebildet, daß der dem Weg der Elektronenstrahlen in der fertigen Röhre entspricht. Auf dem Schirm sollen Leuchtstoffstreifen im wesentlichen konstanter Breite erzielt werden. Die Transparenz der Maske ändert sich jedoch erheblich z.B. von ihrer Mitte zum Rand hin. Außerdem sind die Dicke und Temperatur der im Beschirmverfahren aufgegossenen lichtempfindlichen Leuchtstoffschicht abhängig vom Schirmort. Dies alles führt dazu, daß noch ein Filter 7 verwendet wird, welches auf der Linse 6 oder direkt unter ihr, oder wie in Figur 1 gezeichnet direkt über ihr angeordnet ist.Dieses Filter beeinflußt die Intensität der Lichtstrahlen so, daß im Endeffekt Leuchtstoffstreifen nur wenig schwankender Breite erzielt werden. In der Regel ist die Transparenz des Filters am Rande erheblich höher als in der Mitte.In such a process as e.g. In DE-OS 24 40 575 is described, fluorescent strips are to be achieved with a fluctuating strip width only within small limits. A device for carrying out such a method is shown in FIG. 1 in its essential components. On the front glass 1 there is a light-
Das Filter besteht üblicherweise aus einer Gelatine-Ruß-Schicht auf Glas. Die Herstellung einer solchen Schicht ist ausführlich in der DE-OS 20 36 684 beschrieben.The filter usually consists of a gelatin-soot layer on glass. The production of such a layer is described in detail in DE-OS 20 36 684.
Bei Belichtung durch ein derartiges Filter werden Leuchtstoffstreifen enthalten, deren Breiteneinhaltung völlig zufriedenstellend ist, jedoch sind die Ränder der Streifen ziemlich zerrissen, was in ungünstigen Fällen im Betrieb der Röhre zu erheblichen Farbortschwankungen z.B. in einem einheitlich weißen Bild Anlaß gibt.When exposed through such a filter, fluorescent strips are included, the width compliance of which is completely satisfactory, but are the edges of the strips are fairly torn, which in unfavorable cases gives rise to considerable fluctuations in color when the tube is in operation, for example in a uniform white image.
Es bestand daher die Aufgabe, ein Belichtungsverfahren anzugeben, mit dem scharf berandete Leuchtstoffstreifen mit nur geringen Breiteschwankungen erzielbar sind.It was therefore the task of specifying an exposure method with which sharply edged fluorescent strips can be achieved with only slight fluctuations in width.
Die Lösung der Aufgabe ist dem ersten Anspruch entnehmbar. Nach einer Belichtung völlig ohne Filter wie im ersten Verfahrensschritt werden Streifen erhalten, die sehr scharf berandet sind, die jedoch keine konstante Breite aufweisen. Durch den die Breite korrigierenden zweiten Verfahrensschritt mit Filter wird die Streifenberandung nur unwesentlich verschlechtert und ist erheblich besser als beim bisherigen Verfahren, wo die Gesamtlichtmenge durch ein Filter aufgestrahlt wird.The solution to the problem can be found in the first claim. After exposure without a filter as in the first process step, strips are obtained which have very sharp edges, but which do not have a constant width. The width-correcting second method step with a filter only marginally worsens the fringe and is considerably better than in the previous method, where the total amount of light is irradiated through a filter.
Die Belichtungszeit wird beim erfindungsgemäßen Verfahren erheblich verkürzt, da die Hauptlichtmenge ohne lichtschwächendes Filter aufgebracht wird. Die Gesamtbelichtungszeit für beide Verfahrensschritte beträgt weniger als die Hälfte im Vergleich zum bisher bekannten Verfahren.The exposure time is considerably shortened in the method according to the invention, since the main amount of light is applied without a light-reducing filter. The total exposure time for both process steps is less than half compared to the previously known process.
Vorteilhafte Ausführungsformen sind den Unteransprüchen entnehmbar.Advantageous embodiments can be found in the subclaims.
Die Erfindung wird im folgenden anhand der Figur 2 und durch ein Ausführungsbeispiel näher erläutert.The invention is explained below with reference to Figure 2 and an embodiment.
In Figur 2 ist die bei der Belichtung aufgebrachte Lichtmenge in Abhängigkeit vom Schirmort dargestellt. Die Lichtmenge ist jeweils am Schirmort gemessen, also hinter der Schattenmaske von der Lichtquelle aus gesehen. Im ersten Verfahrensschritt wird die Lichtmenge M1 in der Mitte M des Schirmes aufgebracht. Am Punkt D, der der am weitesten von der Mitte entfernte Punkt auf einer Diagonalen ist, ist die aufgebrachte Lichtmenge D1. Diese ist geringer als M1, weil der Punkt D von der Beleuchtungsquelle weiter entfernt ist als M und weil die Maskentransparenz vom Mittelpunkt M weg stark abnimmt. Beim Fortschreiten auf einer Diagonalen von M nach D ergibt sich die rechts gestrichelt eingezeichnete Abhängigkeit der im ersten Verfahrensschritt aufgebrachten Lichtmenge vom Schirmort. Links in Figur 2 ist entsprechend gestrichelt die Lichtmenge beim Fortschreiten auf einer vertikalen Linie vom Mittelpunkt M bis zu einem in vertikaler Richtumg am weitesten von M entfernten Punkt V aufgetragen.FIG. 2 shows the amount of light applied during exposure as a function of the location of the screen. The amount of light is measured at the location of the screen, i.e. seen from behind the shadow mask from the light source. In the first process step, the amount of light M 1 is applied in the middle M of the screen. At point D, which is the most distant point on a diagonal, the amount of light applied is D 1 . This is less than M1 because point D is farther away from the illumination source than M and because the mask transparency decreases sharply away from center M. Progressing on a diagonal from M to D results in the dependency of the quantity of light applied in the first method step on the shield location, shown in dashed lines on the right. Correspondingly, on the left in FIG. 2, the amount of light as it progresses is plotted on a vertical line from the center M to a point V furthest from M in the vertical direction.
Ausgezogen ist dagegen die Abhängigkeit der Lichtmengen eingezeichnet, die insgesamt aufgebracht werden müssen, um die geforderte Streifenbreite am jeweiligen Schirmort zu erzielen.On the other hand, the dependency of the amounts of light that have to be applied in total in order to achieve the required stripe width at the respective screen location is drawn out.
In der Mitte muß die insgesamt geringste Lichtmenge aufgebracht werden. Nach außen hin sind höhere, jedoch vom Schirmort abhängige, Lichtmengen aufzubringen. Die zusätzlichen Lichtmengen werden im zweiten Verfahrensschritt zugeführt. In der Mitte entspricht die insgesamt notwendige Lichtmenge Mi der im ersten Verfahrensschritt zugeführten Lichtmenge M1. Im Punkt D dagegen fehlt zur insgesamt notwendigen LIchtmenge Di nach dem ersten Verfahrensschritt noch die Lichtmenge Di - D1. Diese Lichtmenge D2 = Di - D1 wird im zweiten, korrigierenden Verfahrensschritt aufgebracht. Entsprechend wird im Punkt V noch die Lichtmenge V2 = Vi - V1 zugeführt, wobei Vi die insgesamt notwendige Lichtmenge am Punkt V ist, um die geforderte Streifenbreite zu erzielen.The smallest amount of light overall must be applied in the middle. Higher amounts of light, depending on the location of the screen, should be applied to the outside. The additional amounts of light are added in the second process step. In the middle, the total amount of light M i required corresponds to the amount of light M 1 supplied in the first method step. At point D, on the other hand, the amount of light D i - D 1 is still missing for the total required light quantity D i after the first method step. This amount of light D 2 = D i - D 1 is applied in the second, corrective method step. Correspondingly, the amount of light V 2 = V i -V 1 is also supplied at point V, V i being the total amount of light required at point V in order to achieve the required strip width.
Das Ausführungsbeispiel bezieht sich auf das Belichten des grünen Leuchtstoffs. Bei Belichtung durch ein Gelatine-Ruß-Filter nach dem bisher üblichen Verfahren beträgt die Belichtungszeit 20 sec. Die Transmission des verwendeten Filters beträgt in der Mitte etwa 10 %.The exemplary embodiment relates to the exposure of the green phosphor. In the case of exposure through a gelatin-soot filter using the previously customary method, the exposure time is 20 seconds. The transmission of the filter used is approximately 10% in the middle.
Beim erfindungsgemäßen Verfahren wird im ersten Verfahrensschritt völlig ohne Filter, also bei 100 % Transmission, 1,8 sec belichtet. Damit sind 90 % der insgesamt erforderlichen Lichtmenge aufgebracht. Diese Belichtung ohne Filter liefert ausgezeichnet scharf berandete Streifen, jedoch von nicht zufriedenstellender Breitenverteilung.In the process according to the invention, exposure is carried out for 1.8 seconds in the first process step, completely without a filter, ie with 100% transmission. This means that 90% of the total amount of light required is applied. This exposure without a filter produces excellent, sharp-edged strips, but with an unsatisfactory width distribution.
Im zweiten Schritt wird ein Filter in den Strahlengang gebracht, welches in der Mitte 3 % Transmission besitzt und über eine solche, von der Mitte aus zunehmende Transmission verfügt, daß nach der Belichtung des zweiten Verfahrensschnittes die richtigen Streifenbreiten erhalten sind. Die Berandung der Streifen verschlechtert sich bei dieser zweiten Teilbelichtung nur unerheblich und ist insgesamt erheblich besser, als wenn, wie bisher, die gesamte Lichtmenge durch ein Filter aufgestrahlt wird. Die Belichtungsdauer des zweiten Schritts beträgt 6 - 7 sec. Insgesamt wird also 8 - 9 sec statt wie früher 20 sec. belichtet.In the second step, a filter is brought into the beam path, which has 3% transmission in the middle and has such a transmission that increases from the center that the correct stripe widths are obtained after exposure of the second process section. Thieves The edge of the strips deteriorates only marginally during this second partial exposure and is overall considerably better than if, as before, the entire amount of light is irradiated through a filter. The exposure time of the second step is 6 - 7 seconds. In total, 8 - 9 seconds are exposed instead of 20 seconds as before.
Das Ausführungsbeispiel weicht insofern vom Prinzip der Figur 2 ab, als bei Figur 2 in der Mitte im ersten Schritt die gesamt notwendige Lichtmenge aufgebracht wird und im zweiten Verfahrensschritt nur noch außerhalb der Mitte korrigiert wird. Im Ausführungsbeispiel werden in der Mitte jedoch nur 90 % der notwendigen Lichtmenge im ersten Schritt zugeführt und im zweiten die restlichen 10 %. Dies rührt daher, daß es nur mit großem Aufwand möglich wäre, Filter mit Transmission Null in der Mitte und mit festgelegtem Transmissionsverlauf nach außen hin herzustellen. Das verwendete Filter hat, wie oben erwähnt, in der Mitte 3 % Transmission, weswegen auch im zweiten Verfahrensschritt im praktischen Beispiel in der Mitte noch Licht zugeführt wird.The exemplary embodiment deviates from the principle of FIG. 2 in that, in FIG. 2, the total amount of light required is applied in the middle in the first step and is only corrected outside the center in the second method step. In the exemplary embodiment, however, only 90% of the required amount of light is supplied in the middle in the first step and the remaining 10% in the second. This is due to the fact that it would be possible only with great effort to produce filters with transmission zero in the middle and with a defined transmission curve to the outside. As mentioned above, the filter used has 3% transmission in the middle, which is why in the second process step in the practical example, light is still supplied in the middle.
Das verwendete Filter kann z.B. nach einem der in der DE-OS 20 36 684 oder der DE-OS 20 59 135 ausführlich beschriebenen Verfahren hergestellt werden.The filter used can e.g. can be produced by one of the processes described in detail in DE-OS 20 36 684 or DE-OS 20 59 135.
Die Belichtung in zwei Schritten läßt sich vorteilhaft dadurch realisieren, daß auf derselben Belichtungsvorrichtung zweimal belichtet wird, jedoch im ersten Schritt ohne Filter und im zweiten Schritt mit dem in den Strahlengang eingeschobenen oder eingedrehten Filter.Exposure in two steps can advantageously be achieved by exposing twice on the same exposure device, but in the first step without a filter and in the second step with the filter inserted or screwed into the beam path.
Eine weitere Möglichkeit ist die, daß das zu belichtende Frontglas von einer ersten Belichtungsvorrichtung ohne Filter, auf der der erste Belichtungsschritt erfolgt, zu einer zweiten Belichtungsvorrichtung mit Filter befördert wird.Another possibility is that the front glass to be exposed is conveyed from a first exposure device without a filter, on which the first exposure step takes place, to a second exposure device with a filter.
Das Filter kann außeraus Gelatine-Ruß auch aus anderen Materialien hergestellt sein. Es kann auch ein Filter sein, bei dem das Transmissionsverhalten durch unterschiedliche Anzahl gleich breiter lichtundurchlässiger Gebiete pro Fläche oder verschieden breiter lichtundurchlässiger Gebiete gegeben wird. Auch mit unterschiedlicher Zeitdauer in den Strahlengang geschobene Blenden können Verwendung finden. Besonder vorteilhaft ist in diesem Fall eine rotierende Blende mit einem Blendenausschnitt durch den die im zweiten Belichtungsschritt geforderte korrigierende Intensitätsverteilung realisiert wird.The filter can be made of other materials besides gelatin black. It can also be a filter in which the transmission ver hold by different numbers of equally wide opaque areas per area or differently wide opaque areas. Apertures pushed into the beam path with different durations can also be used. In this case, it is particularly advantageous to use a rotating diaphragm with a diaphragm cut-out through which the correcting intensity distribution required in the second exposure step is realized.
Claims (5)
dadurch gekennzeichnet, daß
in einem ersten Verfahrensschritt der Hauptteil der zur Aushärtung erforderlichen Lichtmenge ohne Einwirkung auf die ortsabhängige Lichtmengenverteilung eingestrahlt wird, und daß in einem zweiten Verfahrensschritt im wesentlichen die an der erforderlichen Gesamtlichtmenge noch fehlende ortsabhängige Lichtmenge eingestrahlt wird.1) Method for producing fluorescent screens for color picture tubes with a front glass and a shadow mask, in which a light-curable layer applied to the front glass is exposed through the shadow mask to an amount of light which differs from place to place on the front glass using an exposure device,
characterized in that
in a first process step, the main part of the quantity of light required for curing is irradiated without affecting the location-dependent light quantity distribution, and in a second process step essentially the location-dependent light quantity still lacking in the required total light quantity is irradiated.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2902239A DE2902239C2 (en) | 1979-01-20 | 1979-01-20 | Process for the production of the fluorescent strips on the screen of a color picture tube |
| DE2902239 | 1979-01-20 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0014004A1 true EP0014004A1 (en) | 1980-08-06 |
| EP0014004B1 EP0014004B1 (en) | 1983-05-18 |
Family
ID=6061062
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP80200003A Expired EP0014004B1 (en) | 1979-01-20 | 1980-01-02 | Process for making the luminescent stripes on a screen of a colour display tube |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US4284695A (en) |
| EP (1) | EP0014004B1 (en) |
| JP (1) | JPS5598438A (en) |
| DE (1) | DE2902239C2 (en) |
| FI (1) | FI800134A7 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0146226A3 (en) * | 1983-10-14 | 1987-07-01 | Sony Corporation | Methods of and apparatus for exposing colour cathode ray tubes |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4516841A (en) * | 1983-08-19 | 1985-05-14 | Rca Corporation | Method for screening line screen slit mask color picture tubes |
| US4568162A (en) * | 1983-08-19 | 1986-02-04 | Rca Corporation | Method for screening line screen slit mask color picture tubes |
| US5071380A (en) * | 1989-07-13 | 1991-12-10 | Mitsubishi Denki Kabushiki Kaisha | Method and apparatus for forming patterns of fluorescence on a color crt |
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| DE2151519A1 (en) * | 1970-10-17 | 1972-04-20 | Mitsubishi Electric Corp | Exposure device for the production of the fluorescent screen of color television tubes |
| DE2221692A1 (en) * | 1971-05-05 | 1972-11-09 | Rca Corp | Photographic screen printing process for a cathode ray tube |
| US3841875A (en) * | 1972-04-28 | 1974-10-15 | Zenith Radio Corp | Method for grading the screen of a color tube |
| DE2424694A1 (en) * | 1973-05-23 | 1974-12-12 | Rca Corp | METHOD OF MANUFACTURING A GRADUATED EXPOSURE STENCIL |
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| US2717545A (en) * | 1951-08-27 | 1955-09-13 | Engeler Walter | Illuminating device |
| US3005708A (en) * | 1957-05-29 | 1961-10-24 | Westinghouse Electric Corp | Method of making a screen member |
| US3287130A (en) * | 1964-08-25 | 1966-11-22 | Rauland Corp | Process of cathode-ray tube screening comprising a backward exposure step |
| US3592112A (en) * | 1969-07-25 | 1971-07-13 | Rca Corp | Photographic printing of cathode-ray tube screen structure |
| US4013467A (en) * | 1971-06-18 | 1977-03-22 | Matsushita Electronics Corporation | Method of manufacturing color picture tubes using rotating light attenuator |
| BE793997A (en) * | 1972-01-14 | 1973-05-02 | Rca Corp | PHOTOGRAPHIC PROCESS FOR PRINTING A CATHODIC SCREEN STRUCTURE |
| US3762284A (en) * | 1972-04-28 | 1973-10-02 | Zenith Radio Corp | Method and apparatus for grading the screen of a black surround color tube |
| JPS4988464A (en) * | 1972-12-25 | 1974-08-23 | ||
| AU7108074A (en) * | 1973-08-10 | 1976-01-15 | Westinghouse Electric Corp | Picture tube |
| GB1481979A (en) * | 1973-08-29 | 1977-08-03 | Hitachi Ltd | Light exposure apparatus for manufacturing colour picture tube |
| NL7602752A (en) * | 1976-03-17 | 1977-09-20 | Philips Nv | EXPOSURE DEVICE FOR MANUFACTURING DISPLAYS OF COLOR TV DISPLAY TUBES AND DISPLAY TUBE MADE WITH SUCH A DEVICE. |
-
1979
- 1979-01-20 DE DE2902239A patent/DE2902239C2/en not_active Expired
-
1980
- 1980-01-02 EP EP80200003A patent/EP0014004B1/en not_active Expired
- 1980-01-03 US US06/109,387 patent/US4284695A/en not_active Expired - Lifetime
- 1980-01-16 FI FI800134A patent/FI800134A7/en not_active Application Discontinuation
- 1980-01-18 JP JP369080A patent/JPS5598438A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1437152A1 (en) * | 1963-12-27 | 1968-10-31 | Sylvania Electric Prod | Light damper |
| DE2151519A1 (en) * | 1970-10-17 | 1972-04-20 | Mitsubishi Electric Corp | Exposure device for the production of the fluorescent screen of color television tubes |
| DE2221692A1 (en) * | 1971-05-05 | 1972-11-09 | Rca Corp | Photographic screen printing process for a cathode ray tube |
| US3841875A (en) * | 1972-04-28 | 1974-10-15 | Zenith Radio Corp | Method for grading the screen of a color tube |
| DE2424694A1 (en) * | 1973-05-23 | 1974-12-12 | Rca Corp | METHOD OF MANUFACTURING A GRADUATED EXPOSURE STENCIL |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0146226A3 (en) * | 1983-10-14 | 1987-07-01 | Sony Corporation | Methods of and apparatus for exposing colour cathode ray tubes |
Also Published As
| Publication number | Publication date |
|---|---|
| FI800134A7 (en) | 1981-01-01 |
| EP0014004B1 (en) | 1983-05-18 |
| JPS5598438A (en) | 1980-07-26 |
| DE2902239A1 (en) | 1980-07-24 |
| US4284695A (en) | 1981-08-18 |
| DE2902239C2 (en) | 1983-01-20 |
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