US3887753A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluorescent film for color picture tube and process of preparing same
Assignee: Panasonic Holdings Corp
•
Filing: 1973-06-27
•
Granted: 1975-06-03
•
Expires: 1993-06-27
Abstract
Abstract Phosphor particles coated with a mixture of GeO2 and SiO2 or a mixture of WO3 and SiO2 are dispersed in an aqueous solution of a photosensitive resin together with a protective dispersing agent for the particles in the solution to form a slurry. Y2O3 :Eu phosphor particles with the coating are chemically stable and do not hydrolize in the slurry. The slurry is then applied to the inner surface of a glass tube. The resulting phosphor film is dried, printed and developed by the photographic technique to form a desired pattern of the phosphor material. By the invention manufacturing a bright color picture tube employing Y2O3:Eu phosphor becomes possible in commercial success.
Inventors
- 👤 Chikayoshi Ninagawa
- 👤 Osamu Yoshida
- 👤 Shigeya Ashizaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:10
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/20; H01J9/22; H01J9/227; H01J9/2271; H01J29/00; H01J29/02; H01J29/10; H01J29/18; H01J29/22; H01J29/225; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/256
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
98 words
A CATHODE RAY TUBE COMPRISING A FACE PLATE HAVING A FLUORESCENT FILM ON ONE SURFACE COMPRISING PHOSPHOR PARTICLES COATED WITH A MEMBER SELECTED FROM THE GROUP CONSISTING OF A MIXTURE OF GEO2 AND SIO2 AND A MIXTURE OF WO3 AND SIO2 WHEREIN THE AMOUN OF SAID MEMBER CONSTITUTES FROM 0.5 TO 5.0% OF THE WEIGHT OF SAID PHOSPHER PARTICLES AND IN THE FIRST INSTANCE THE AMOUNT OF THE GEO2 CONSTITUTES 0.3 TO 4.9% OF THE WEIGHT OF SAID PARTICLES WHILE IN THE SECOND INSTANCE THE AMOUNT OF WO3 CONSTITUTES 0.3 TO 4.9% OF THE WEIGHT OF SAID PARTICLES.
Claim 2
Dependent Claim
98 words
A CATHODE RAY TUBE COMPRISING A FACE PLATE HAVING A FLUORESCENT FILM ON ONE SURFACE COMPRISING PHOSPHOR PARTICLES COATED WITH A MEMBER SELECTED FROM THE GROUP CONSISTING OF A MIXTURE OF GEO2 AND SIO2 AND A MIXTURE OF WO3 AND SIO2 WHEREIN THE AMOUN OF SAID MEMBER CONSTITUTES FROM 0.5 TO 5.0% OF THE WEIGHT OF SAID PHOSPHER PARTICLES AND IN THE FIRST INSTANCE THE AMOUNT OF THE GEO2 CONSTITUTES 0.3 TO 4.9% OF THE WEIGHT OF SAID PARTICLES WHILE IN THE SECOND INSTANCE THE AMOUNT OF WO3 CONSTITUTES 0.3 TO 4.9% OF THE WEIGHT OF SAID PARTICLES.
Claim 3
Dependent Claim
98 words
A catHode ray tube comprising a face plate having a fluorescent film on one surface comprising phosphor particles coated with a member selected from the group consisting of a mixture of GeO2 and SiO2 and a mixture of WO3 and SiO2 wherein the amount of said member constitutes from 0.5 to 5.0% of the weight of said phosphor particles and in the first instance the amount of the GeO2 constitutes 0.3 to 4.9% of the weight of said particles while in the second instance the amount of WO3 constitutes 0.3 to 4.9% of the weight of said particles.
Claim 4
Dependent Claim
98 words
A catHode ray tube comprising a face plate having a fluorescent film on one surface comprising phosphor particles coated with a member selected from the group consisting of a mixture of GeO2 and SiO2 and a mixture of WO3 and SiO2 wherein the amount of said member constitutes from 0.5 to 5.0% of the weight of said phosphor particles and in the first instance the amount of the GeO2 constitutes 0.3 to 4.9% of the weight of said particles while in the second instance the amount of WO3 constitutes 0.3 to 4.9% of the weight of said particles.
Claim 5
Dependent Claim
26 words
The cathode ray tube of claim 1 wherein the phosphor materials consist of phosphors selected from the group consisting of sulfide phosphors and rare earth phosphors.
Claim 6
Dependent Claim
168 words
A process for preparing a fluorescent film on a color picture tube having a glass faceplate with an inner surface comprising coating phosphor particles with a member selected from the group consisting of a mixture of GeO2 and SiO2 and a mixture of WO3 and SiO2 wherein the amounts of said member constitutes from 0.5 to 5.0% of the weight of said phosphor particles and wherein the amount of the GeO2 in the first member constitutes 0.3 to 4.9% of the weight of said particles while the weight of WO3 in the second member constitutes 0.3 to 4.9% of the weight of said particles forming a slurry of the coated phosphor particle with a photosensitive resin by, introducing said coated particles together with a dispersing agent into said photosensitive resin, said dispensing agent being such as not to cause gelation of the slurry, applying the resulting slurry to the inner surface of the picture tube, and drying and heating the coated phosphor particles to form the fluorescent film.
Claim 7
Dependent Claim
168 words
A process for preparing a fluorescent film on a color picture tube having a glass faceplate with an inner surface comprising coating phosphor particles with a member selected from the group consisting of a mixture of GeO2 and SiO2 and a mixture of WO3 and SiO2 wherein the amounts of said member constitutes from 0.5 to 5.0% of the weight of said phosphor particles and wherein the amount of the GeO2 in the first member constitutes 0.3 to 4.9% of the weight of said particles while the weight of WO3 in the second member constitutes 0.3 to 4.9% of the weight of said particles forming a slurry of the coated phosphor particle with a photosensitive resin by, introducing said coated particles together with a dispersing agent into said photosensitive resin, said dispensing agent being such as not to cause gelation of the slurry, applying the resulting slurry to the inner surface of the picture tube, and drying and heating the coated phosphor particles to form the fluorescent film.
Claim 8
Dependent Claim
76 words
A process according to claim 3, wherein said coating of the phosphor particles is prepared by steps comprising preparing a mixture selected from the group consisting of a mixture of GeO2 and SiO2 and a mixture of WO3 and SiO2, and water glass, introducing baked phosphor particles into said mixture, stirring the resulting mixture and baking the resulting mixture thereby to apply a coating of said mixture to the whole surface of said each phosphor particle.
Claim 9
Dependent Claim
32 words
A process according to claim 3 wherein said dispersing agent consists of colloidal silica constituting from about 0.01 to 0.5% of the weight of said photosensitive resin solution including said colloidal silica.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |