EP0895267B1 - Farbbildröhre - Google Patents
Farbbildröhre Download PDFInfo
- Publication number
- EP0895267B1 EP0895267B1 EP19970113315 EP97113315A EP0895267B1 EP 0895267 B1 EP0895267 B1 EP 0895267B1 EP 19970113315 EP19970113315 EP 19970113315 EP 97113315 A EP97113315 A EP 97113315A EP 0895267 B1 EP0895267 B1 EP 0895267B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- shadow mask
- water glass
- bismuth oxide
- suspension
- picture tube
- 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
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
- H01J29/06—Screens for shielding; Masks interposed in the electron stream
- H01J29/07—Shadow masks for colour television tubes
-
- 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
- H01J9/02—Manufacture of electrodes or electrode systems
- H01J9/14—Manufacture of electrodes or electrode systems of non-emitting electrodes
- H01J9/142—Manufacture of electrodes or electrode systems of non-emitting electrodes of shadow-masks for colour television tubes
- H01J9/146—Surface treatment, e.g. blackening, coating
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2229/00—Details of cathode ray tubes or electron beam tubes
- H01J2229/07—Shadow masks
- H01J2229/0727—Aperture plate
- H01J2229/0777—Coatings
Definitions
- the invention relates to a color picture tube according to the Preamble of claim 1.
- the shadow mask of a color picture tube on the Side facing away from the screen with an electron reflective layer to the doming behavior of the Improve shadow mask.
- the suspension used for Coating the shadow mask with such a layer contains bismuth oxide and Water glass, the weight percentage of water glass too Bismuth oxide on this suspension is between 4 and 15.5% and with good doming behavior, the productivity of the Color tube production improved.
- sodium water glass is in this suspension used.
- the glass body of the color image display tube 1 consists of a screen 2 and a cone with a neck area 4. Die Color image display tube 1 contains an electron gun 5, which is arranged inside the tube neck 4 is.
- the inside of the screen of the color display tube 2 is with groups of three fluorescent dots with one each red, green and blue glowing dots coated.
- the phosphor layer 8 is inside the color image display tube 1 attached a shadow mask 3. This shadow mask 3 is about 15 mm from the Fluorescent layer 8 and has openings that are related to the Phosphor dots of the phosphor layer 8 are arranged.
- the opening is arranged so that the Electron beam 7 only at point 10 on the Fluorescent coating 8 of the screen 2 strikes.
- the Heating of the shadow mask 3 by electrons on it the shadow mask deforms and has one Bulge 3a on.
- the openings of the Shadow mask 3a shifted and the electrons of the Electron beam 7 hit at point 11 on the Fluorescent layer 8.
- This deformation is called doming denotes and affects the image quality of the Color picture tube.
- the electron reflection and Heat emission coefficient of the shadow mask 3 can be increased, so that doming behavior with its negative effects on the picture quality of the color picture tube can be improved.
- the color picture tube has a getter 6.
- the Getter material is evaporated during gettering from getter 6 and is deposited on the inside of the color picture tube. getter can be significant through absorption or chemical conversion Capture a lot of gas and maintain it or improve it serve the vacuum in the color picture tube. It has shown, that this layer of getter material on the one in the above described shadow mask 3 coated the Doming behavior negatively affected. An increase in doming due to deposition of a layer of getter material the shadow mask can be prevented by, for example the getter material is evaporated from the shadow mask. However, this makes the position and shape of the getter 6 restricted and part of the inside of the color picture tube is not covered with getter material.
- the opposite side of the Provide shadow mask 3 with a bismuth oxide coating is provided.
- a bismuth oxide coating has the advantage of being one higher electron backscatter coefficients than that Has an iron oxide layer on the shadow mask.
- a bismuth oxide coating can therefore the one absorbed by the shadow mask Reduce electron energy and in this way doming behavior improve.
- the suspension used according to the invention for coating the shadow mask 3 also contains a certain proportion of water glass.
- Water glass can be sodium water glass, for example Na 2 O.3SiO 2 or potassium water glass, for example K 2 O.3SiO 2 .
- a suspension of bismuth oxide and sodium water glass is preferably used.
- Fig. 4 shows the ratio of the Parts by weight of sodium water glass to bismuth oxide on the Suspension at what reject rate in the manufacture of Color picture tubes leads. It shows that a relationship below 4% to a significantly higher reject rate the manufacturing leads. At a ratio of 4% or greater the reject rate remains at a very low level.
- a suspension is therefore used for coating the side of the shadow mask facing away from the screen which is the weight fraction of sodium water glass and bismuth oxide Ratio that is between 4 and 15.5%. On Ratio within this range leads to a good one Doming behavior with a low reject rate of the Manufacturing process for such color display tubes.
- the suspension for coating such shadow masks sets within this range of water, bismuth oxide and Sodium water glass together. At a ratio of 4% by weight of sodium water glass to bismuth oxide the suspension contains, for example, 1.11% sodium water glass, 27.97% bismuth oxide and 70.92% water. At a ratio of Such a suspension contains 15.5% by weight for example 4.04% sodium water glass, 26.08% bismuth oxide and 69.88% water.
- a particularly advantageous composition that have both goals at the same time - good doming behavior and low rejection rate in production - fulfilled, can with a ratio of the parts by weight of sodium water glass to achieve bismuth oxide of about 7.5%.
- Such a suspension consists for example of 2.07% sodium water glass, 27.27% Bismuth oxide and 70.66% water together.
- the one for coating the shadow mask used particularly advantageous suspension with a Ratio of parts by weight (without water) of about 7.5% Sodium water glass to bismuth oxide exposes itself in this case 4.08% of the 50% sodium water glass solution, from 68.03% of the 40% bismuth oxide solution and 27.89% water together.
- the suspension can be used for everyone Ratios of the weight fraction of sodium water glass to Bismuth oxide to sodium water glass of the specified range form without being caused by the dissolution of the fixed Components of the suspension in water, clear Fluctuations in concentration occur in the suspension.
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Electrodes For Cathode-Ray Tubes (AREA)
Description
- Fig.1
- den inneren Aufbau einer Farbbildröhre,
- Fig.2
- einen Ausschnitt des Aufbaus der Farbbildröhre, um die Auswirkungen des Domings darzustellen,
- Fig.3
- ein Diagramm, welches das Doming in Abhängigkeit vom Verhältnis Natriumwasserglas/Wismutoxid angibt, und
- Fig.4
- ein Diagramm, das die Ausschußrate bei der Bildröhrenherstellung in Abhängigkeit vom Gewichtsverhältnis von Natriumwasserglas/Wismutoxid angibt.
Claims (3)
- Farbbildröhre mit einer Elektronenkanone, einem Bildschirm und einer Schattenmaske, wobei die Schattenmaske auf der dem Bildschirm abgewandten Seite mit einer Suspension beschichtet ist, die als Bestandteile Wismutoxid und Wasserglas enthält, dadurch gekennzeichnet, daß der Gewichtsanteil von Wasserglas zu Wismutoxid an der Suspension zwischen 4 und 15,5 % liegt.
- Farbbildröhre nach Anspruch 1, dadurch gekennzeichnet, daß das Wasserglas Natrium-Wasserglas ist.
- Farbbildröhre nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die zur Beschichtung der Schattenmaske verwendete Suspension die folgenden Bestandteile mit etwa den jeweils angegebenen Gewichtsanteilen aufweist:27,27 % Wismutoxid,2,07 % Natriumwasserglas und70,66 % Wasser.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP19970113315 EP0895267B1 (de) | 1997-08-01 | 1997-08-01 | Farbbildröhre |
DE59706243T DE59706243D1 (de) | 1997-08-01 | 1997-08-01 | Farbbildröhre |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP19970113315 EP0895267B1 (de) | 1997-08-01 | 1997-08-01 | Farbbildröhre |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0895267A1 EP0895267A1 (de) | 1999-02-03 |
EP0895267B1 true EP0895267B1 (de) | 2002-01-30 |
Family
ID=8227162
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19970113315 Expired - Lifetime EP0895267B1 (de) | 1997-08-01 | 1997-08-01 | Farbbildröhre |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0895267B1 (de) |
DE (1) | DE59706243D1 (de) |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62281225A (ja) * | 1986-05-29 | 1987-12-07 | Mitsubishi Electric Corp | カラ−陰極線管の製造方法 |
JPH061662B2 (ja) * | 1986-06-13 | 1994-01-05 | 三菱電機株式会社 | カラ−陰極線管の製造方法 |
JPH0210627A (ja) * | 1988-06-27 | 1990-01-16 | Mitsubishi Electric Corp | シヤドウマスクの電子反射膜の形成方法 |
JPH0210626A (ja) * | 1988-06-27 | 1990-01-16 | Mitsubishi Electric Corp | シヤドウマスクの電子反射膜の形成方法 |
US4884004A (en) * | 1988-08-31 | 1989-11-28 | Rca Licensing Corp. | Color cathode-ray tube having a heat dissipative, electron reflective coating on a color selection electrode |
JPH0448530A (ja) * | 1990-06-15 | 1992-02-18 | Mitsubishi Electric Corp | カラー陰極線管とその製造方法 |
JPH08190857A (ja) * | 1995-01-09 | 1996-07-23 | Hitachi Ltd | シャドウマスクの製造方法 |
JPH08329838A (ja) * | 1995-05-29 | 1996-12-13 | Hitachi Ltd | シャドウマスクの形成方法 |
-
1997
- 1997-08-01 EP EP19970113315 patent/EP0895267B1/de not_active Expired - Lifetime
- 1997-08-01 DE DE59706243T patent/DE59706243D1/de not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
DE59706243D1 (de) | 2002-03-14 |
EP0895267A1 (de) | 1999-02-03 |
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