EP0412983A1 - Television picture tube - Google Patents
Television picture tubeInfo
- Publication number
- EP0412983A1 EP0412983A1 EP19890905103 EP89905103A EP0412983A1 EP 0412983 A1 EP0412983 A1 EP 0412983A1 EP 19890905103 EP19890905103 EP 19890905103 EP 89905103 A EP89905103 A EP 89905103A EP 0412983 A1 EP0412983 A1 EP 0412983A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- picture tube
- television picture
- panel
- funnel
- prior
- 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.)
- Withdrawn
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
- H01J9/24—Manufacture or joining of vessels, leading-in conductors or bases
- H01J9/26—Sealing together parts of vessels
- H01J9/263—Sealing together parts of vessels specially adapted for cathode-ray tubes
-
- 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
- H01J29/86—Vessels; Containers; Vacuum locks
- H01J29/861—Vessels or containers characterised by the form or the structure thereof
Definitions
- the present invention relates to a television picture tube comprising a funnel and a flat glass panel placed on, and joined to the edge of, the funnel.
- a television picture tube of this kind is known (DE-C2-29 20 930). It turned out that when the television picture tube has been evacuated, the originally flat panel is deformed concavely under the external atmospheric pressure. This effect increases as the thickness of the panel decreases or if the panel is made of light glass or laminated sheet glass.
- the use of laminated sheet glass in television picture tubes is disclosed in US-A-4,483,452.
- the technical problem to be solved by the invention is to improve the prior art television picture tube in such a manner that it has a flat panel after its evacuation.
- the amount of the convex precurving of the panel is to be such that the panel will be flat after the evacuation of the television picture tube.
- the proper dimensioning of the convex curvature as a function of the data of the panel can be determined by experiments.
- Fig. 1 is a schematic cross section of a finished television picture tube in accordance with the invention.
- Fig. 2 is a schematic cross section of the television picture tube of Fig. 1 prior to evacuation.
- the television picture tube consists of the funnel 1 and the flat panel 2.
- the funnel 1 and the panel 2 are fritsealed together at the edge 3.
- Fig. 2 differs from Fig. 1 only in that the television picture tube shown has not been evacuated yet. In this condition, the panel 2 is curved convexly.
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
Abstract
Lors de l'utilisation de tubes cathodiques à fond plat, la déformation concave de la plaque de fond (2) qui se produit après l'application du vide dans le tube cathodique constitue un problème. Pour éviter cette déformation, la présente invention propose d'utiliser une plaque de fond (2) à laquelle on donne une courbure convexe avant de la joindre à l'entonnoir (1) et avant l'application du vide.When using flat bottom cathode ray tubes, the concave deformation of the bottom plate (2) which occurs after applying vacuum to the cathode ray tube is a problem. To avoid this deformation, the present invention proposes to use a bottom plate (2) to which a convex curvature is given before joining it to the funnel (1) and before applying the vacuum.
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19883813524 DE3813524A1 (en) | 1988-04-22 | 1988-04-22 | TELEVISION PIPES |
DE3813524 | 1988-04-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0412983A1 true EP0412983A1 (en) | 1991-02-20 |
Family
ID=6352609
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19890905103 Withdrawn EP0412983A1 (en) | 1988-04-22 | 1989-04-21 | Television picture tube |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0412983A1 (en) |
DE (1) | DE3813524A1 (en) |
WO (1) | WO1989010625A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19840590A1 (en) * | 1998-09-05 | 2000-03-09 | Brigitte Kobilarov | Concave display screen front panel for PCs and TVs forms section of a sphere with center point front of the screen at normal distance for using display for normal size of front panel |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2187036A (en) * | 1986-02-21 | 1987-08-26 | Philips Electronic Associated | Cathode ray tube |
-
1988
- 1988-04-22 DE DE19883813524 patent/DE3813524A1/en not_active Withdrawn
-
1989
- 1989-04-21 WO PCT/EP1989/000441 patent/WO1989010625A1/en not_active Application Discontinuation
- 1989-04-21 EP EP19890905103 patent/EP0412983A1/en not_active Withdrawn
Non-Patent Citations (1)
Title |
---|
See references of WO8910625A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE3813524A1 (en) | 1989-11-02 |
WO1989010625A1 (en) | 1989-11-02 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 19900927 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): DE FR GB IT NL |
|
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: NOKIA (DEUTSCHLAND) GMBH |
|
17Q | First examination report despatched |
Effective date: 19930831 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 19940804 |