GB1224850A - Improvements in or relating to colour picture tubes of the shadow mask type - Google Patents
Improvements in or relating to colour picture tubes of the shadow mask typeInfo
- Publication number
- GB1224850A GB1224850A GB57895/69A GB5789569A GB1224850A GB 1224850 A GB1224850 A GB 1224850A GB 57895/69 A GB57895/69 A GB 57895/69A GB 5789569 A GB5789569 A GB 5789569A GB 1224850 A GB1224850 A GB 1224850A
- Authority
- GB
- United Kingdom
- Prior art keywords
- mils
- mask
- apertures
- screen
- shadow mask
- 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
-
- 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)
- Electrodes For Cathode-Ray Tubes (AREA)
Abstract
1,224,850. Making screens. ZENITH RADIO CORP. 26 Nov., 1969 [28 March, 1969], No. 57895/69. Heading B3A. [Also in Division H1] A shadow mask for a colour television tube comprises a metal plate 10, Fig. 3, containing an array of apertures 11 opposite each of which is provided a recess 11a of similar shape. The shadow mask is used to produce a fluorescent screen by a photo-resist process, and after processing the screen the mask is etched to enlarge the apertures 11. In one example a sheet of cold rolled steel is coated on each side with a photo-resist and illuminated through a mask to provide a dot pattern on each side, and after etching in ferric chloride apertures are formed as shown in Fig. 3. The mask is used in photoresist processes to form on the screen firstly a dark area between phosphor dot areas, and then the three sets of phosphor dots, after which the screen is aluminized. The mask is then subjected to a second etch which enlarges the apertures and reduces the thickness of the mask. The initial thicknesses E1 and E2 may be 7 mils and 2¢ mils, the diameters D1 and D2 9 mils and 22 mils, the final thicknesses 5 mils and 1¢ mils, and the final aperture diameter 16 mils. The apertures need not be of uniform size, but may increase in diameter with radial distance from the centre; they may also be of elongate form (Fig. 5, not shown) so that the mask becomes a grid and the screen is of the multi-line type.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US81131869A | 1969-03-28 | 1969-03-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1224850A true GB1224850A (en) | 1971-03-10 |
Family
ID=25206216
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB57895/69A Expired GB1224850A (en) | 1969-03-28 | 1969-11-26 | Improvements in or relating to colour picture tubes of the shadow mask type |
Country Status (4)
Country | Link |
---|---|
US (1) | US3666462A (en) |
DE (1) | DE2014090A1 (en) |
GB (1) | GB1224850A (en) |
NL (1) | NL7003142A (en) |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3753663A (en) * | 1969-08-15 | 1973-08-21 | Zenith Radio Corp | Blank for shadow mask for color television picture tube |
JPS5713985B2 (en) * | 1971-08-27 | 1982-03-20 | ||
US4070596A (en) * | 1971-08-27 | 1978-01-24 | Tokyo Shibaura Electric Co., Ltd. | In-line plural beams cathode ray tube having color phosphor element strips spaced from each other by intervening light absorbing areas and slit-shaped aperture mask |
BE793999A (en) * | 1972-01-14 | 1973-05-02 | Rca Corp | METHOD OF MANUFACTURING MASK-TYPE IMAGE TUBES FOR COLOR TELEVISION |
US3738233A (en) * | 1972-01-17 | 1973-06-12 | Zenith Radio Corp | Camera process for color tube screen printing |
JPS513733Y2 (en) * | 1972-01-19 | 1976-02-03 | ||
JPS4882769A (en) * | 1972-02-07 | 1973-11-05 | ||
US3923566A (en) * | 1972-06-21 | 1975-12-02 | Rca Corp | Method of fabricating an apertured mask for a cathode-ray tube |
NL7214003A (en) * | 1972-10-17 | 1974-04-19 | ||
NL7404209A (en) * | 1974-03-28 | 1975-09-30 | Philips Nv | PROCEDURE FOR MANUFACTURING REPRODUCTION MASKS FOR THE SHADOW MASK OF A PICTURE TUBE AND PICTURE TUBE MANUFACTURED IN ACCORDANCE WITH THIS PROCESS. |
US4105493A (en) * | 1975-07-05 | 1978-08-08 | The Gillette Company | Production of shaving foil |
JPS59158051A (en) * | 1983-02-28 | 1984-09-07 | Toshiba Corp | Manufacture of shadow mask |
US4865953A (en) * | 1987-09-28 | 1989-09-12 | Rca Licensing Corp. | Method for making a stencil with a borax-free, low-dichromate, casein photoresist composition |
-
1969
- 1969-03-28 US US811318A patent/US3666462A/en not_active Expired - Lifetime
- 1969-11-26 GB GB57895/69A patent/GB1224850A/en not_active Expired
-
1970
- 1970-03-05 NL NL7003142A patent/NL7003142A/xx unknown
- 1970-03-18 DE DE19702014090 patent/DE2014090A1/en active Pending
Also Published As
Publication number | Publication date |
---|---|
DE2014090A1 (en) | 1970-10-08 |
NL7003142A (en) | 1970-09-30 |
US3666462A (en) | 1972-05-30 |
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