GB721579A - Improvements in or relating to low-pressure discharge tubes - Google Patents
Improvements in or relating to low-pressure discharge tubesInfo
- Publication number
- GB721579A GB721579A GB31714/52A GB3171452A GB721579A GB 721579 A GB721579 A GB 721579A GB 31714/52 A GB31714/52 A GB 31714/52A GB 3171452 A GB3171452 A GB 3171452A GB 721579 A GB721579 A GB 721579A
- Authority
- GB
- United Kingdom
- Prior art keywords
- tube
- electrode
- strip
- thermionic
- discharge
- 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
- H01J61/545—Igniting arrangements, e.g. promoting ionisation for starting using an auxiliary electrode inside the vessel
Landscapes
- Discharge Lamp (AREA)
Abstract
721,579. Electric discharge tubes. PHILIPS ELECTRICAL INDUSTRIES, Ltd. Dec. 15, 1952 [Dec. 18, 1951]. No. 31714/52. Class 39 (1). A low pressure D.C. cylindrical discharge tube 1, for example, a fluorescent tube, comprising at least one activated thermionic electrode 7 and at least one conductive strip 3 which is insulated from the electrode 7 but connected to the other main electrode 6 and extends substantially throughout the length of the tube on the inner wall surface, is characterized in that the discharge tube contains apart from mercury, argon, the pressure of which has a value of 3 to 5 mm. Hg, e.g. 4 mm., at room temperature and in that the smallest distance between the thermionic electrode 7 and the strip 3 insulated therefrom is 10 to 6 mm., e.g. 7 mm., so that the product of pressure and distance is about 30. The centre of the thermionic electrode 7 is located between the axis of the tube 1 and the strip 3. A construction is referred to wherein the strip is provided with a projection which is arranged nearer a normal central electrode than. the wall of the tube. One of the supply wires 5 of the electrode 6 is connected to the strip 3 by a short metal wire 8 and a ferrochrome strip 9 curved in the shape of a quarter circle and secured to the metal wire 8. Both electrodes 6 and 7 may be activated thermionic coiled-coil electrodes and two parallel strips 2, 3 spaced apart by substantially a quarter of the internal circumference of the discharge tube can be provided, the connection between the electrode 7 and the strip 2 being similar to that between the electrode 6 and the strip 3. The tube can have a length of 120 cms. and an internal diameter of 3.6 cms., and the conductive strips can have a width of 3 mm. It is stated that the tube ignites and attains the arc-discharge condition at a current strength of about 380 mA., and an arc voltage of about 105 within half a second after the tube has been connected through a series resistor of about 300 ohms to a 220 direct voltage source. At a direct voltage of 165 the arc discharge condition is attained substantially within one second.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL721579X | 1951-12-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB721579A true GB721579A (en) | 1955-01-05 |
Family
ID=19817404
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB31714/52A Expired GB721579A (en) | 1951-12-18 | 1952-12-15 | Improvements in or relating to low-pressure discharge tubes |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB721579A (en) |
-
1952
- 1952-12-15 GB GB31714/52A patent/GB721579A/en not_active Expired
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