DE3314971A1 - Method of cleaning the face-plate of a cathode-ray tube - Google Patents
Method of cleaning the face-plate of a cathode-ray tubeInfo
- Publication number
- DE3314971A1 DE3314971A1 DE19833314971 DE3314971A DE3314971A1 DE 3314971 A1 DE3314971 A1 DE 3314971A1 DE 19833314971 DE19833314971 DE 19833314971 DE 3314971 A DE3314971 A DE 3314971A DE 3314971 A1 DE3314971 A1 DE 3314971A1
- Authority
- DE
- Germany
- Prior art keywords
- acid
- cleaning
- washing
- ray tube
- organic acid
- 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- Withdrawn
Links
Classifications
-
- 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
- H01J9/38—Exhausting, degassing, filling, or cleaning vessels
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
Abstract
Description
Beschreibungdescription
Verfahren zum Reinigen der Frontscheibe einer Kathodenstrahlröhre Die vorliegende Erfindung betrifft ein Verfahren zum Reinigen der für eine Beschichtung mit einem Leuchtstoff vorgesehenen Oberfläche einer gläsernen Frontscheibe einer Kathodenstrahlröhre durch Waschen mit einer wässerigen Lösung, die verdünnte Flußsäure enthält.Method for cleaning the front screen of a cathode ray tube The present invention relates to a method for cleaning the for a coating provided with a fluorescent surface of a glass front pane of a Cathode ray tube by washing with an aqueous solution containing dilute hydrofluoric acid contains.
Es ist bekannt, die Frontschalen von Oszillographenröhren, Fernsehbildröhren und dergleichen vor der Beschichtung mit den Leuchtschirmmaterialien mit verdünnter Flußsäure zu reinigen. Dabei treten insbesondere bei Frontschalen mit unterschiedlicher Glaszusammensetzung mehr oder weniger starke Galsverätzungen auf, die sich nicht lgur beim späteran Betrieb der Röhre, sondern auch bereits bei Bescirmungen nachteilig auswirken können.It is known that the front panels of oscilloscope tubes, television picture tubes and the like before coating with the screen materials with thinned To clean hydrofluoric acid. This occurs in particular with front shells with different Glass composition has more or less strong gals burns, which are not This is only disadvantageous when the tube is operated later, but also when it comes to shielding can affect.
Besonders stark treten solche Verätzungen dann auf, wenn die Frontschalen aus stark bleihaltigen Gläsern bestehen und wenn solche Reinigungsprozesse z. B. im Zuge von Wiedergewinnungsverfahren mehrmals angewendet werden müssen.Such chemical burns occur particularly strongly when the front shells consist of strongly leaded glasses and if such cleaning processes z. B. must be applied several times in the course of recovery procedures.
Optisch nachteilig wirken sich solcher Verätzungserscheinungen besonders dann aus, wenn die Frontschalen für Kathodenstrahlröhren mit hohem Auflösungsvermögen gedacht sind, z. B. für Feinpunktröhren und dergleichen.Such chemical burns are particularly visually disadvantageous then off if the front panels for cathode ray tubes with high resolution are intended, e.g. B. for fine point tubes and the like.
Der vorliegenden Erfindung liegt die Aufgabe zugrunde, ein verbessertes Reinigungsverfahren der eingangs genannten Art anzugeben, das zu wesentlich geringeren Verätzungserscheinungen der zu beschirmenden Glasoberfläche führt und andererseits Glasoberflächen ergibt, auf welchen Beschirmungsmaterialien sehr fest und dauerhaft haften.The present invention is based on the object of an improved Specify cleaning methods of the type mentioned at the beginning, which lead to much lower Chemical burns of the glass surface to be shielded leads and on the other hand Glass surfaces result in what shielding materials are very strong and durable be liable.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß das Waschen bei gleichzeitiger Anwendung einer verdünnten organischen Säure vorgenommen wird.This object is achieved according to the invention in that the washing is carried out with the simultaneous use of a dilute organic acid.
Bei der Reinigung mit der angegebenen Waschlösung wird ein sehr gleichmäßiger Glasabtrag erreicht, der nicht nur unerwünschte starke Aufrauhungen vermeidet, sondern ggf.When cleaning with the specified washing solution, it becomes very even Glass removal achieved, which not only avoids unwanted strong roughening, but possibly.
vorhandene Aufrauhungen einebnet. Es lassen sich so Leuchtschirme mit äußerst planer und fast polierter Frontschale herstellen, auf welchen die Leuchtstoffe sehr gut haften, z. B. auch dann, wenn sie, wie bei hochwertigen Röhren zweckmäßig, kataphoretisch aufgebracht werden.levels existing roughening. It can be made of fluorescent screens with an extremely flat and almost polished front shell on which the phosphors adhere very well, e.g. B. even if, as is appropriate with high-quality tubes, be applied cataphoretically.
En einer besonders vorteilEIaften Weiterbilc3ung sehr Erfin-(lung erfolgt das Waschen der Frotltschalln mit einem wäss eringen Gemisch aus Flußsäure uni Weinsäti re. Werden ganz besonders hochwertige Glasoberflächen zur Leuchtstoffbeschichtung geforrlert, so hat sich besonders bewA-Lrt, diesem Gemisch aus Flußsäure und organischer Säure einen Alkohol, inbesondere Isopropylalkohol, zuzusetzen. Die Waschlösung besteht zweckmäßigerweise aus einem Gemisch einer 2- bis 1obigen Flußsäure mit einer 2- bis 10%gen organischen Säure, insbesondere Weinsäure. Bei jeweils 57.igem Anteil dieser beiden Säuren konnte selbst bei der Reinigung der Frontschalen aus Weichgläsern keine unerwünscht starke Aufrauhung festgestellt werden.In a particularly advantageous further training, a very great development the washing of the Frotltschalln takes place with an aqueous mixture of hydrofluoric acid uni wine saturation. Particularly high-quality glass surfaces are used for fluorescent coatings required, so it has proven particularly this mixture of hydrofluoric acid and organic acid to add an alcohol, especially isopropyl alcohol. the The washing solution expediently consists of a mixture of 2 to 1 above hydrofluoric acid with a 2 to 10% organic acid, especially tartaric acid. At each 57th The proportion of these two acids could even come off when cleaning the front panels No undesirably strong roughening can be found on soft glasses.
Claims (5)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19833314971 DE3314971A1 (en) | 1983-04-26 | 1983-04-26 | Method of cleaning the face-plate of a cathode-ray tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19833314971 DE3314971A1 (en) | 1983-04-26 | 1983-04-26 | Method of cleaning the face-plate of a cathode-ray tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE3314971A1 true DE3314971A1 (en) | 1984-10-31 |
Family
ID=6197327
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19833314971 Withdrawn DE3314971A1 (en) | 1983-04-26 | 1983-04-26 | Method of cleaning the face-plate of a cathode-ray tube |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE3314971A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4102886A1 (en) * | 1991-01-31 | 1992-08-06 | Georg Van Eyk | Reducing the release of heavy metals, esp. lead, from glass surfaces - by treatment with an aq. complex-forming extn. medium |
| WO2001090015A1 (en) * | 2000-05-19 | 2001-11-29 | Heraeus Quarzglas Gmbh & Co. Kg | Solution for treating surface of glass and treatment method |
| WO2007045269A1 (en) * | 2005-10-21 | 2007-04-26 | Freescale Semiconductor, Inc. | Method for cleaning a semiconductor structure and chemistry thereof |
-
1983
- 1983-04-26 DE DE19833314971 patent/DE3314971A1/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4102886A1 (en) * | 1991-01-31 | 1992-08-06 | Georg Van Eyk | Reducing the release of heavy metals, esp. lead, from glass surfaces - by treatment with an aq. complex-forming extn. medium |
| WO2001090015A1 (en) * | 2000-05-19 | 2001-11-29 | Heraeus Quarzglas Gmbh & Co. Kg | Solution for treating surface of glass and treatment method |
| WO2007045269A1 (en) * | 2005-10-21 | 2007-04-26 | Freescale Semiconductor, Inc. | Method for cleaning a semiconductor structure and chemistry thereof |
| US8211844B2 (en) | 2005-10-21 | 2012-07-03 | Freescale Semiconductor, Inc. | Method for cleaning a semiconductor structure and chemistry thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 8120 | Willingness to grant licences paragraph 23 | ||
| 8139 | Disposal/non-payment of the annual fee |