GB400453A - Improvements in or relating to so called braun tubes or cathode ray tubes suitable for use for television, picture telegraphy and other purposes - Google Patents
Improvements in or relating to so called braun tubes or cathode ray tubes suitable for use for television, picture telegraphy and other purposesInfo
- Publication number
- GB400453A GB400453A GB36617/32A GB3661732A GB400453A GB 400453 A GB400453 A GB 400453A GB 36617/32 A GB36617/32 A GB 36617/32A GB 3661732 A GB3661732 A GB 3661732A GB 400453 A GB400453 A GB 400453A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cathode
- diaphragm
- oxide
- chromium
- ray tubes
- 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
- H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
- H01J29/48—Electron guns
- H01J29/484—Eliminating deleterious effects due to thermal effects, electrical or magnetic fields; Preventing unwanted emission
Landscapes
- Electrodes For Cathode-Ray Tubes (AREA)
Abstract
400,453. Cathode-ray tubes. TELEFUNKEN GES. FœR DRAHTLOSE TELEGRAPHIE, 12, Hallesches Ufer, Berlin. Dec. 24, 1932, No. 36617. Convention date, Dec. 24, 1931. [Class 39 (i).] Cathode-ray tubes for use in television &c. or as oscillographs are provided, in addition to any control or concentrating electrodes such as the Wehnelt cylinder W, with a conductive "throttling" diaphragm B<1> in front of and immediately adjacent the cathode. K to suppress disturbing emission of electrons from hot parts of the cathode other than the oxide spot 0, and the diaphragm B<1> is so arranged and constructed that it does not itself emit electrons thermionically. To ensure this, a low temperature of the diaphragm relatively to that of the cathode during operation of the tube is secured by mounting the diaphragm not on the hot cathode, but on a cool leading- in wire for the cathode and the heater S as shown, and by forming the surface of the diaphragm as a black heat radiator. The diaphragm may also be coated with emissionsuppressing material such as tungsten, chromium or uranium oxide, or carbon or chromium. The diaphragm B<1> may be at the potential of the cathode K or positive or negative thereto. The indirectly-heated cathode K may be replaced by a directly-heated filament for use with accumulators. Gas fillings may be used to assist the concentration of the ray. The arrangement of the parts in the cylinder W is in accordance with the rules set out in Specication 392,781. Specification 391,360 also is referred to. The Specification as open to inspection under Sect. 91 comprises also treating the cathode parts adjacent the oxide spot to suppress emission, as by spraying with chromium oxide, carbonizing, chromium plating, coating with tungsten or uranium oxide, or fitting insulating casings. Insulating diaphragms are also referred to. This subject-matter does not appear in the Specification as accepted.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE400453X | 1931-12-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB400453A true GB400453A (en) | 1933-10-26 |
Family
ID=6400122
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB36617/32A Expired GB400453A (en) | 1931-12-24 | 1932-12-24 | Improvements in or relating to so called braun tubes or cathode ray tubes suitable for use for television, picture telegraphy and other purposes |
Country Status (2)
| Country | Link |
|---|---|
| GB (1) | GB400453A (en) |
| NL (1) | NL37197C (en) |
-
0
- NL NL37197D patent/NL37197C/xx active
-
1932
- 1932-12-24 GB GB36617/32A patent/GB400453A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| NL37197C (en) |
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