GB1178052A - A Noiseless Discharge Tube - Google Patents
A Noiseless Discharge TubeInfo
- Publication number
- GB1178052A GB1178052A GB06719/67A GB1671967A GB1178052A GB 1178052 A GB1178052 A GB 1178052A GB 06719/67 A GB06719/67 A GB 06719/67A GB 1671967 A GB1671967 A GB 1671967A GB 1178052 A GB1178052 A GB 1178052A
- Authority
- GB
- United Kingdom
- Prior art keywords
- oxides
- mixture
- emissive
- tube
- borides
- 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
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/02—Details
- H01J61/04—Electrodes; Screens; Shields
- H01J61/06—Main electrodes
- H01J61/073—Main electrodes for high-pressure discharge lamps
- H01J61/0735—Main electrodes for high-pressure discharge lamps characterised by the material of the electrode
- H01J61/0737—Main electrodes for high-pressure discharge lamps characterised by the material of the electrode characterised by the electron emissive material
Landscapes
- Discharge Lamp (AREA)
Abstract
1,178,052. Cathode materials and processing. MATSUSHITA ELECTRONICS CORP. 12 April, 1967 [20 April, 1966], No. 16719/67. Heading H1D. A discharge tube, more especially a low pressure Hg fluorescent lamp, has cathodes coated with emissive material comprising the oxides of Ba, Sr and Ca together with, in a proportion of from 0À05-10% by weight of the oxides, a substance having the composition of: {(1-x)Fe : xCo} 2 By where 0À15 # x #0À6 and 1 # y # 1À15, i.e. consisting principally of Fe-Co borides, the mixture of borides and 0 xides further containing, in a proportion of from 1-8% by weight of the oxides, one or more of the high melting point metals selected from the group comprising Zr, Hf, Nb and Ta. Initially, with the oxides present as carbonates, the emissive mixture may be suspended in a butyl acetate solution of nitrocellulose and applied to double or triple W coil supports and the resulting coated coils may then be heated during the degassing of the tube to convert the carbonates to oxides. Fluorescent lamps incorporating such cathodes reduce the interference noise to 15dB or less and the blackening of the tube envelope is held at an acceptable level. A number of specific examples of the composition of the emissive mixture are given.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2563166 | 1966-04-20 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1178052A true GB1178052A (en) | 1970-01-14 |
Family
ID=12171199
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB06719/67A Expired GB1178052A (en) | 1966-04-20 | 1967-04-12 | A Noiseless Discharge Tube |
Country Status (5)
Country | Link |
---|---|
US (1) | US3427492A (en) |
BE (1) | BE697244A (en) |
DE (1) | DE1589231B2 (en) |
GB (1) | GB1178052A (en) |
NL (1) | NL146637B (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3505553A (en) * | 1966-05-12 | 1970-04-07 | Philips Corp | Radio-interference-free low-pressure mercury-vapor lamp |
US5834895A (en) * | 1990-10-25 | 1998-11-10 | Fusion Lighting, Inc. | Visible lamp including selenium |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2473358A (en) * | 1946-08-23 | 1949-06-14 | Raytheon Mfg Co | Cathode coating for electron discharge devices |
US2820920A (en) * | 1952-09-17 | 1958-01-21 | Claude Ets | Manufacture of coated electrodes |
BE526330A (en) * | 1953-02-09 | |||
US2849637A (en) * | 1956-02-02 | 1958-08-26 | Weiss Harry | Electrode for fluorescent lamp |
US3312856A (en) * | 1963-03-26 | 1967-04-04 | Gen Electric | Rhenium supported metallic boride cathode emitters |
-
1967
- 1967-04-12 GB GB06719/67A patent/GB1178052A/en not_active Expired
- 1967-04-17 US US631258A patent/US3427492A/en not_active Expired - Lifetime
- 1967-04-17 NL NL676705394A patent/NL146637B/en unknown
- 1967-04-19 BE BE697244D patent/BE697244A/xx unknown
- 1967-04-20 DE DE19671589231 patent/DE1589231B2/en not_active Withdrawn
Also Published As
Publication number | Publication date |
---|---|
BE697244A (en) | 1967-10-02 |
NL146637B (en) | 1975-07-15 |
US3427492A (en) | 1969-02-11 |
DE1589231B2 (en) | 1971-09-30 |
NL6705394A (en) | 1967-10-23 |
DE1589231A1 (en) | 1970-09-10 |
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