GB1319433A - Screening a black-surround colour cathode ray tube - Google Patents
Screening a black-surround colour cathode ray tubeInfo
- Publication number
- GB1319433A GB1319433A GB4989171A GB4989171A GB1319433A GB 1319433 A GB1319433 A GB 1319433A GB 4989171 A GB4989171 A GB 4989171A GB 4989171 A GB4989171 A GB 4989171A GB 1319433 A GB1319433 A GB 1319433A
- Authority
- GB
- United Kingdom
- Prior art keywords
- light
- phosphor
- sequence
- inch
- light source
- 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
- 238000012216 screening Methods 0.000 title 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 abstract 6
- 239000000463 material Substances 0.000 abstract 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract 2
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 abstract 2
- 239000006096 absorbing agent Substances 0.000 abstract 2
- 239000011358 absorbing material Substances 0.000 abstract 2
- 239000011248 coating agent Substances 0.000 abstract 2
- 238000000576 coating method Methods 0.000 abstract 2
- 238000000151 deposition Methods 0.000 abstract 2
- 238000006073 displacement reaction Methods 0.000 abstract 2
- 229910002804 graphite Inorganic materials 0.000 abstract 2
- 239000010439 graphite Substances 0.000 abstract 2
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 abstract 2
- 230000000873 masking effect Effects 0.000 abstract 2
- 238000000034 method Methods 0.000 abstract 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 abstract 1
- 239000000919 ceramic Substances 0.000 abstract 1
- 230000008021 deposition Effects 0.000 abstract 1
- SOCTUWSJJQCPFX-UHFFFAOYSA-N dichromate(2-) Chemical compound [O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O SOCTUWSJJQCPFX-UHFFFAOYSA-N 0.000 abstract 1
- 238000010894 electron beam technology Methods 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 239000011159 matrix material Substances 0.000 abstract 1
- 239000000049 pigment Substances 0.000 abstract 1
- 230000005855 radiation Effects 0.000 abstract 1
- 238000007493 shaping process Methods 0.000 abstract 1
- 239000002002 slurry Substances 0.000 abstract 1
- 239000002904 solvent Substances 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 1
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
- H01J9/20—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
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Formation Of Various Coating Films On Cathode Ray Tubes And Lamps (AREA)
Abstract
1319433 Luminescent screens ZENITH RADIO CORP 27 Oct 1971 [21 Dec 1970] 49891/71 Heading H1D A method of fabricating a tricolor phosphor dor (e.g. R.G.B.) c.r.t. comprising exposing a photosensitive resist (e.g. water based solution of p.v.a. with ammonium bichromate) to radiation from a source located at each of three exposure positions displaced in a first direction from three reference exposure positions corresponding to the deflection centres of the three electron beams, removing unexposed portions with a solvent, depositing on the unexposed areas a light absorbing material, stripping exposed resist from the screen, and repeating the steps at at least one more time but with the source located at three exposure positions displaced in a different direction from the reference exposure positions, the light absorbing material defining openings in which phosphor material is to be provided. The method permits the provision of phosphor dots of smaller area than the mask holes. The light source may project a linear rather than circular light pattern having a length dimension greater than a width dimension and the length directed along toward the centre of the triangle defined by the reference exposure positions. The displacements in the respective directions may control the horizontal and vertical dimensions of the openings in the coating pattern. In Fig. 2A, S may be 0À190 inch, and + #S need not equal - #S but is usually the same, and in the range 0À030 to 0À065 inch. The sequence of steps may for example be performed twice or three times, in the latter case the displacements defining a triangular pattern about each of the three reference positions, the apices pointing inwards or outwards for example. (Figs. 6A and 7, not shown). The recesses in the coating at each step of a two sequence process are generally approximately semicircular arcs while the geometry for a three sequence may be as in Fig. 6B (not shown). For exposure at the respective positions in each sequence, the faceplate or light source may be indexed or separate tables used for each colour centre. A light source with collimator having circular tip may produce ellipitcal distortion as in Fig. 5A (not shown), and the major axis may be controlled by the light pattern and the minor axis by control of #S. The former may be by suitable shaping and/or masking the collimator tip (e.g. Fig. 5B, not shown). A slot 0À030 x 0À1 inch may be used with #S of 0À030 to 0À035 inch. The light absorber may be applied as colloidal graphite slurry, and dried to fix, and p.v.a. residue stripped with hydrogen peroxide. The light source (Fig. 8, not shown) may have three tips energized individually at each sequence. The resist may contain the phosphor material during the processing or preferably the matrix is formed prior to phosphor deposition. The phosphor dots may overlap the opaque masking material. Round or rectangular faceplates of spherical sections are instanced. Graphite, manganese dioxide, pigment, and ceramic black are light absorbers mentioned.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US9994970A | 1970-12-21 | 1970-12-21 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1319433A true GB1319433A (en) | 1973-06-06 |
Family
ID=22277370
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB4989171A Expired GB1319433A (en) | 1970-12-21 | 1971-10-27 | Screening a black-surround colour cathode ray tube |
Country Status (3)
Country | Link |
---|---|
US (1) | US3677758A (en) |
CA (1) | CA941006A (en) |
GB (1) | GB1319433A (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE793999A (en) * | 1972-01-14 | 1973-05-02 | Rca Corp | METHOD OF MANUFACTURING MASK-TYPE IMAGE TUBES FOR COLOR TELEVISION |
JPS5137138B2 (en) * | 1972-01-26 | 1976-10-14 | ||
US3954470A (en) * | 1975-03-13 | 1976-05-04 | Gte Sylvania Incorporated | Process for fabricating a color cathode ray tube |
US3998638A (en) * | 1975-05-22 | 1976-12-21 | Westinghouse Electric Corporation | Method of developing opaquely coated sensitized matrix with a solution containing sodium meta-silicate |
US4106937A (en) * | 1976-01-02 | 1978-08-15 | Tektronix, Inc. | Cathode ray storage tube having a target dielectric provided with particulate segments of collector electrode extending therethrough |
-
1970
- 1970-12-21 US US99949A patent/US3677758A/en not_active Expired - Lifetime
-
1971
- 1971-10-27 GB GB4989171A patent/GB1319433A/en not_active Expired
- 1971-12-15 CA CA130,205A patent/CA941006A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
CA941006A (en) | 1974-01-29 |
US3677758A (en) | 1972-07-18 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
PLNP | Patent lapsed through nonpayment of renewal fees |