GB1373862A - Method of fabricating a temporary apertured mask electrode for a colour television tube - Google Patents
Method of fabricating a temporary apertured mask electrode for a colour television tubeInfo
- Publication number
- GB1373862A GB1373862A GB3610972A GB3610972A GB1373862A GB 1373862 A GB1373862 A GB 1373862A GB 3610972 A GB3610972 A GB 3610972A GB 3610972 A GB3610972 A GB 3610972A GB 1373862 A GB1373862 A GB 1373862A
- Authority
- GB
- United Kingdom
- Prior art keywords
- mask
- viscosity
- film
- apertures
- coating
- 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
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
- H01J9/02—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
- H01J9/144—Mask treatment related to the process of dot deposition during manufacture of luminescent screen
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Formation Of Various Coating Films On Cathode Ray Tubes And Lamps (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
- Printing Plates And Materials Therefor (AREA)
Abstract
1373862 Luminescent screens RCA CORPORATION 2 Aug 1972 [2 Aug 1971] 36109/72 Addition to 1311313 Heading HID In the manufacture of a colour television screen by exposure of a photo-resist through a shadow mask which is used in the completed tube the apertures in the shadow mask are made smaller for the photo-resist process by coating at least one surface of the mask with a film material having a thermally reversible viscosity that is lowered by heating and then heating the coated surface until the lower viscosity of the film causes the film to break and to collect in annular deposits around the inner periphery of each mask aperture. The film material may comprise polyvinyl alcohol, an aromatic compound, water, and a plasticizer selected from the groups of glycerines, ethers, ethanolamine salts, thiocyanates, glycols, and formamides. One suitable composition comprises 3% polyvinyl alcohol, 1% red dye, 0À4% wetting agent and the balance water. This has a viscosity/temperature curve as shown at 77 in Fig. 6, as compared with that shown at 80 for a known thermally irreversible composition. When a mask coated with the material is heated, the viscosity drops rapidly down to the point 82 where the film breaks due to surface tension; with continued heating the viscosity increases as shown at 83 and the peripheral regions of the coating on the wall of the apertures harden. It is preferable to heat the mask in a closed chamber so that the vapour pressure increases and the viscosity follows the curve 84. This has a relatively flat minimum region 85 so that differences in temperature over the surface of the mask make little difference to the reduction in size of the apertures by the coating. When 5% ethylene glycol is added to the above composition and the mask is heated in a closed chamber the viscosity follows the curve 79. Two other suitable compositions comprise 5% polyvinyl alcohol, 1% dye, 44% water, and 50% ethylene glycol or glycerine. A convex mask may be rotated slowly about its centre whilst its convex surface extends down into a tank holding the liquid film-forming material, and then tilted to spread the liquid over the surface without forcing it through the apertures. Alternatively the mask may be rotated with its convex surface upwards whilst the material is flowed over the mask, and then rotated more rapidly to remove excess liquid. After the screen has been made the temporary coating may be removed by baking or chemical dissolution to restore the mask to its original condition. This process may be carried out at the same time as a similar process is used to remove resist material from the screen, by baking both at once or by applying dissolution techniques to both at once.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US16811471A | 1971-08-02 | 1971-08-02 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1373862A true GB1373862A (en) | 1974-11-13 |
Family
ID=22610188
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3610972A Expired GB1373862A (en) | 1971-08-02 | 1972-08-02 | Method of fabricating a temporary apertured mask electrode for a colour television tube |
Country Status (8)
Country | Link |
---|---|
JP (1) | JPS5138580B2 (en) |
AU (1) | AU4509872A (en) |
CA (1) | CA961091A (en) |
DE (1) | DE2238096A1 (en) |
FR (1) | FR2148207B1 (en) |
GB (1) | GB1373862A (en) |
IT (1) | IT963636B (en) |
NL (1) | NL7210556A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5556735A (en) * | 1990-06-27 | 1996-09-17 | Coates Brothers Plc | Image-forming process |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS503265A (en) * | 1973-05-11 | 1975-01-14 | ||
CN105416828A (en) * | 2015-12-22 | 2016-03-23 | 重庆安特管业有限公司 | Winding pipe output support |
-
1972
- 1972-07-28 AU AU45098/72A patent/AU4509872A/en not_active Expired
- 1972-07-31 CA CA148,364A patent/CA961091A/en not_active Expired
- 1972-08-01 IT IT2775772A patent/IT963636B/en active
- 1972-08-01 NL NL7210556A patent/NL7210556A/xx unknown
- 1972-08-02 FR FR7227899A patent/FR2148207B1/fr not_active Expired
- 1972-08-02 DE DE19722238096 patent/DE2238096A1/en active Pending
- 1972-08-02 JP JP7756772A patent/JPS5138580B2/ja not_active Expired
- 1972-08-02 GB GB3610972A patent/GB1373862A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5556735A (en) * | 1990-06-27 | 1996-09-17 | Coates Brothers Plc | Image-forming process |
US5750291A (en) * | 1990-06-27 | 1998-05-12 | Coates Brothers Plc | Image-forming process |
Also Published As
Publication number | Publication date |
---|---|
CA961091A (en) | 1975-01-14 |
DE2238096A1 (en) | 1973-02-15 |
IT963636B (en) | 1974-01-21 |
AU4509872A (en) | 1974-01-31 |
FR2148207B1 (en) | 1977-04-01 |
NL7210556A (en) | 1973-02-06 |
FR2148207A1 (en) | 1973-03-16 |
JPS5138580B2 (en) | 1976-10-22 |
JPS4826062A (en) | 1973-04-05 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |
Free format text: FOR 1372862 READ 1373862 IN JOURNAL 4919,PAGE 1886 |