GB788661A - Improvements in or relating to methods of forming screen structures for cathode ray tubes - Google Patents
Improvements in or relating to methods of forming screen structures for cathode ray tubesInfo
- Publication number
- GB788661A GB788661A GB24592/54A GB2459254A GB788661A GB 788661 A GB788661 A GB 788661A GB 24592/54 A GB24592/54 A GB 24592/54A GB 2459254 A GB2459254 A GB 2459254A GB 788661 A GB788661 A GB 788661A
- Authority
- GB
- United Kingdom
- Prior art keywords
- luminescent
- photosensitive material
- deposited
- portions
- 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
- 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
- H01J29/10—Screens on or from which an image or pattern is formed, picked up, converted or stored
- H01J29/18—Luminescent screens
- H01J29/30—Luminescent screens with luminescent material discontinuously arranged, e.g. in dots, in lines
- H01J29/32—Luminescent screens with luminescent material discontinuously arranged, e.g. in dots, in lines with adjacent dots or lines of different luminescent material, e.g. for colour television
- H01J29/325—Luminescent screens with luminescent material discontinuously arranged, e.g. in dots, in lines with adjacent dots or lines of different luminescent material, e.g. for colour television with adjacent lines
-
- 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)
- Preparing Plates And Mask In Photomechanical Process (AREA)
Abstract
788,661. Luminescent screens for colour television tubes. PHILCO CORPORATION. Aug. 24, 1954 [Aug. 25, 1953], No. 24592/54. Class 39(1). Method of forming a luminescent screen for a colour television C.R.T. comprises depositing unexposed photosensitive material, e.g. a water solution of polyvinyl alcohol mixed with ethyl alcohol and a solution of ammonium or potassium dichromate on a translucent or transparent substrate, the photosensitive material having substantially different solubility in pre-determined solvents, e.g. water, when exposed than when unexposed and being retentive of substances deposited thereon at least in its condition of lesser solubility, exposing, e.g., through a mask of strip or dot form, selected portions of the photosensitive material, thereby modifying the solubility of the exposed portions in the predetermined solvents, depositing a luminexcent substance on the exposed and unexposed portions of the photosensitive material and applying at least one of the solvents to the photosensitive material, thereby removing selectively from the substrate the portions of the photosensitive material having the greater solubility and the luminescent substance deposited thereon while leaving on the substrate the portions of the photosensitive material having the lesser solubility and the luminescent substance deposited thereon. A second and third luminescent substance can be deposited on the substrate in displaced positions by the same method using a movable mask. A thin aluminium film is deposited on the luminescent substances and then an organic film as described in Specification 761,180. A substance having a secondary electron emission ratio substantially in excess of unity, e.g., MgO, silver, gold, tungsten and other high atomic weight elements, can be deposited on the organic film by the same method as for the luminescent substances to form indexing strips. The indexing substances may be deposited in the form of narrow parallel strips superimposed on every third luminescent strip, e.g., having the same colour. In a modification the indexing strips can be made of a luminescent material having a light emissivity different from that of the aluminium film. The structure is finally baked to substantially completely vaporize the organic - film and remaining photosensitive material. Apparatus for exposing the photo. sensitive material is shown in Fig. 2 and comprises a box-like supporting frame 16 provided with an apertured frame 16a for receiving the face plate 17 of the C.R.T. 18. Alternatively the face plate 17 alone can be inserted in the frame 16a. A light source 20, a mask having opaque and translucent portions, and a micrometer adjustment 22 for the mask 21 are provided. A point light source can be used for luminescent and/or indexing material elements in the form of dots and a line light source for elements in the form of strips. The photosensitive material can be applied to the face plate 17 by spraying or by flowing down the wall of the flared portion 19 to a thickness of 0À005 to 0À025 inches after which it is dried by an air blast at a temperature of less than 75‹F. The luminescent layers are applied by spraying in a water suspension or dusting to a surface density of 0À5 to 6 mgrs. per sq. cm. In an alternative arrangement the light source is disposed above the narrow end of the flared portion 19 and a scaled-down mask is disposed within this narrow end, the neck 19a being removed and replaced at the end of the process. In cases where the photo-sensitive material is rendered more soluble by exposure to light the above apparatus can be used provided that the mask is aligned with the C.R.T. face plate during each exposure so that those portions to be eventually covered with substance are shielded from illumination. Specification 713,908 also is referred to.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US376345A US2950193A (en) | 1953-08-25 | 1953-08-25 | Method of manufacturing electrical apparatus |
Publications (1)
Publication Number | Publication Date |
---|---|
GB788661A true GB788661A (en) | 1958-01-08 |
Family
ID=23484650
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB24592/54A Expired GB788661A (en) | 1953-08-25 | 1954-08-24 | Improvements in or relating to methods of forming screen structures for cathode ray tubes |
Country Status (2)
Country | Link |
---|---|
US (1) | US2950193A (en) |
GB (1) | GB788661A (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2992107A (en) * | 1954-10-19 | 1961-07-11 | Zenith Radio Corp | Method of manufacturing luminescent screens |
US3198634A (en) * | 1956-06-25 | 1965-08-03 | Philco Corp | Method of depositing particulate solid material on selected portions of a substrate |
US3514287A (en) * | 1961-10-09 | 1970-05-26 | Rca Corp | Photographic method for making tri-colored cathode ray screen |
NL6512812A (en) * | 1965-10-02 | 1967-04-03 |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US679501A (en) * | 1899-10-31 | 1901-07-30 | Louis Antoine Garchey | Photographic process and product. |
US959692A (en) * | 1908-01-28 | 1910-05-31 | Maurice Anthes | Reproduction of images on glass, porcelain, ceramic, metallic or other surfaces. |
US1718945A (en) * | 1924-04-14 | 1929-07-02 | ||
GB244644A (en) * | 1925-05-16 | 1925-12-24 | Hugo Keller | Screens for colour photography |
US2370330A (en) * | 1941-08-07 | 1945-02-27 | Scriver Smith & Zerbst Inc | Photographic process |
GB654504A (en) * | 1948-07-06 | 1951-06-20 | Mondiacolor Sa | Photographic sensitised multi-colour screen |
US2653871A (en) * | 1949-11-14 | 1953-09-29 | Bemis Bro Bag Co | Preparation of engraved rubber printing plates |
US2683769A (en) * | 1950-11-27 | 1954-07-13 | Jr Thomas A Banning | Color television and the like |
US2756167A (en) * | 1953-07-10 | 1956-07-24 | Philco Corp | Method of manufacturing cathode-ray tube screen structures |
-
1953
- 1953-08-25 US US376345A patent/US2950193A/en not_active Expired - Lifetime
-
1954
- 1954-08-24 GB GB24592/54A patent/GB788661A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
US2950193A (en) | 1960-08-23 |
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