GB1493270A - Discharge lamps - Google Patents
Discharge lampsInfo
- Publication number
- GB1493270A GB1493270A GB5574574A GB5574574A GB1493270A GB 1493270 A GB1493270 A GB 1493270A GB 5574574 A GB5574574 A GB 5574574A GB 5574574 A GB5574574 A GB 5574574A GB 1493270 A GB1493270 A GB 1493270A
- Authority
- GB
- United Kingdom
- Prior art keywords
- conductor
- arrangement
- tube
- bimetal switch
- electrode
- 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
- H01J61/54—Igniting arrangements, e.g. promoting ionisation for starting
- H01J61/547—Igniting arrangements, e.g. promoting ionisation for starting using an auxiliary electrode outside the vessel
Landscapes
- Discharge Lamps And Accessories Thereof (AREA)
- Discharge Lamp (AREA)
- Circuit Arrangements For Discharge Lamps (AREA)
Abstract
1493270 Starting discharge lamps MATSUSHITA ELECTRONICS CORP 24 Dec 1974 [28 Dec 1973] 55745/74 Heading H2H [Also in Division H1] A conductor 14 attached to the outer wall of the arc tube 1 of a discharge lamp, having a filling of sodium, a metallic buffer gas and a starting gas, e.g. a neon-argon mixture, is located near the electrode at one end of the tube and is connected to the electrode at the other end of the tube by an arrangement which permits a starting potential to be applied initially to the conductor 14 and then, once the arc has been struck, allows the potential of the conductor 14 to float. This arrangement may comprise an element 15 having two opposed spaced apart electrodes carried by an insulating bead to provide a capacitive coupling between the conductor 14 and the electrode. Alternatively, as shown, the arrangement may comprise a bimetal switch 18 in parallel with the element 15. With the bimetal switch 18 closed, the lamp can be started at a low voltage so there is only a low potential difference between the outer and inner surfaces of the alumina tube 1 at the location of the conductor 14. The temperature and consequently the sodium vapour pressure are also low so there is no diffusion of sodium through the envelope and no blackening at the location of the conductor 14. As the temperature increases the bimetal switch 18 opens and the conductor 14 is left "floating". The bimetal switch may be heated additionally by a heater connected in series therewith. In an alternative arrangement the lead to the conductor 14 is extended through the outerenvelope 11 to an external switch. The outer envelope 11 may contain getters 12, and may be evacuated.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP742836A JPS5718301B2 (en) | 1973-12-28 | 1973-12-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1493270A true GB1493270A (en) | 1977-11-30 |
Family
ID=11540490
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB5574574A Expired GB1493270A (en) | 1973-12-28 | 1974-12-24 | Discharge lamps |
Country Status (4)
Country | Link |
---|---|
JP (1) | JPS5718301B2 (en) |
DE (1) | DE2461568C3 (en) |
FR (1) | FR2256530B1 (en) |
GB (1) | GB1493270A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0028128A1 (en) * | 1979-10-25 | 1981-05-06 | Westinghouse Electric Corporation | Improvements in or relating to high-intensity-discharge sodium lamps |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL170347C (en) * | 1976-01-19 | 1982-10-18 | Philips Nv | ELECTRICAL DEVICE FITTED WITH A METAL VAPOR DISCHARGE LAMP. |
US4037129A (en) * | 1976-03-10 | 1977-07-19 | Gte Sylvania Incorporated | High pressure sodium vapor lamp having low starting voltage |
JPS52167870U (en) * | 1976-06-14 | 1977-12-20 | ||
JPS5484880U (en) * | 1977-11-28 | 1979-06-15 | ||
NL7809055A (en) * | 1978-09-05 | 1980-03-07 | Philips Nv | GAS AND / OR VAPOR DISCHARGE LAMP. |
NL188821C (en) * | 1979-11-28 | 1992-10-01 | Mitsubishi Electric Corp | GAS DISCHARGE LAMP. |
EP0085487B1 (en) * | 1982-01-29 | 1988-11-09 | THORN EMI plc | Improvements in discharge lamps |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3721846A (en) * | 1972-06-26 | 1973-03-20 | Gte Sylvania Inc | Sodium vapor lamp having improved starting means including a heater |
-
1973
- 1973-12-28 JP JP742836A patent/JPS5718301B2/ja not_active Expired
-
1974
- 1974-12-24 GB GB5574574A patent/GB1493270A/en not_active Expired
- 1974-12-27 FR FR7443003A patent/FR2256530B1/fr not_active Expired
- 1974-12-27 DE DE19742461568 patent/DE2461568C3/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0028128A1 (en) * | 1979-10-25 | 1981-05-06 | Westinghouse Electric Corporation | Improvements in or relating to high-intensity-discharge sodium lamps |
Also Published As
Publication number | Publication date |
---|---|
DE2461568B2 (en) | 1979-05-31 |
DE2461568C3 (en) | 1980-02-07 |
JPS5718301B2 (en) | 1982-04-15 |
FR2256530A1 (en) | 1975-07-25 |
FR2256530B1 (en) | 1978-06-23 |
JPS5098177A (en) | 1975-08-04 |
DE2461568A1 (en) | 1975-07-03 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PE20 | Patent expired after termination of 20 years |
Effective date: 19941223 |