EP0003148A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Method of producing luminescent screens, luminescent screens produced by this method and cathode-ray tubes including such luminescent screens
Assignee: Koninklijke Philips NV
•
Filing: 1979-01-09
•
Granted: —
•
Expires: 1999-01-09
Abstract
Abstract A method of making a luminescent screen suitable for use in a cathode-ray tube which is operated with a highly loaded luminescent screen. A luminescent screen comprising a substrate (12) bearing a luminescent layer is produced by spraying a stable aerosol containing a solution (7A) of compounds which are converted on heating into a luminescent material onto the substrate (12) which is maintained at a temperature at which this conversion occurs.
Inventors
- 👤 Theo Johan August Popma
- 👤 Maurits Willem Van Tol
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 04:57
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/20; H01J9/22; H01J9/221; C; C09; C09K; C09K11/00; C09K11/02; C09K11/08; C09K11/77; C09K11/7701
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
69 words
A method of producing a luminescent screen comprising a substrate bearing a luminescent layer, the method comprising the steps of heating the substrate to an elevated temperature and contacting the substrate at said elevated temperature with a solution of compounds which are converted at said elevated temperature into a luminescent material, characterized in that the substrate is sprayed with a stable aerosol containing the solution as a disperse phase.
Claim 2
Independent Claim
69 words
A method of producing a luminescent screen comprising a substrate bearing a luminescent layer, the method comprising the steps of heating the substrate to an elevated temperature and contacting the substrate at said elevated temperature with a solution of compounds which are converted at said elevated temperature into a luminescent material, characterized in that the substrate is sprayed with a stable aerosol containing the solution as a disperse phase.
Claim 3
Dependent Claim
31 words
A method as claimed in Claim 1, characterized in that the average drop size of the aerosol is between 0.1 and 10 / um, preferably between 0.5 and 5 / um.
Claim 4
Dependent Claim
49 words
A method as claimed in Claim 1 or Claim 2, characterized in that a luminescent layer of oxidic rare earth phosphors is produced starting from an aerosol of solutions of nitrates, chlorides, acetyl acetonates, alcoholates and/or phenolates of the component elements in a polar organic solvent or in water.
Claim 5
Independent Claim
27 words
A method as claimed in any of Claims 1, 2 or 3, characterized in that the substrate is kept at a temperature of 300-700 °C during spraying.
Claim 6
Independent Claim
28 words
A method as claimed in in any of Claims 1, 2, 3 or 4, characterized in that a substrate of quartz, quartz glass or aluminium oxide is used.
Claim 7
Independent Claim
23 words
A method as claimed in any preceding Claim, characterized in that the luminescent screen obtained is subjected to a heat treatment at 900-1500°C.
Claim 8
Dependent Claim
43 words
A luminescent screen produced by a method as claimed in any of Claims 1 to 6, characterized in that the luminescent layer consists of adjacent, fine-grained crystalline rods which are tightly bonded to the substrate and are oriented substantially perpendicularly to the substrate.
Claim 9
Dependent Claim
21 words
A cathode-ray tube suitable for screen loads exceeding 5 W/cm 2 and including a luminescent screen as claimed in Claim 7.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.