GB1217799A - High pressure electric discharge lamp - Google Patents
High pressure electric discharge lampInfo
- Publication number
- GB1217799A GB1217799A GB57696/69A GB5769669A GB1217799A GB 1217799 A GB1217799 A GB 1217799A GB 57696/69 A GB57696/69 A GB 57696/69A GB 5769669 A GB5769669 A GB 5769669A GB 1217799 A GB1217799 A GB 1217799A
- Authority
- GB
- United Kingdom
- Prior art keywords
- present
- arc
- atomic ratio
- high pressure
- metal
- 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
- H01J61/12—Selection of substances for gas fillings; Specified operating pressure or temperature
- H01J61/18—Selection of substances for gas fillings; Specified operating pressure or temperature having a metallic vapour as the principal constituent
Landscapes
- Discharge Lamp (AREA)
- Vessels And Coating Films For Discharge Lamps (AREA)
- Discharge Lamps And Accessories Thereof (AREA)
Abstract
1,217,799. Metal-vapour lamps. SYLVANIA ELECTRIC PRODUCTS Inc. 25 Nov., 1969 [29 Nov., 1968], No. 57696/69. Heading H1D. The arc tube of a high pressure lamp has a filling including I, Hg, Sm and Sc, the I and Hg being present at an atomic ratio of from 0À10 to 0À85 and the Hg being present in sufficient quantity to be completely vaporized at the operating temperature of the arc tube and to form a restricted arc therein. The mercury may be present as the metal or as the iodide in an amount of 2À5 x 10<SP>-5</SP> to 4À1 x 10<SP>-5</SP> gram atoms per cm. of arc length. An atomic ratio of I to Hg of 0À45 is preferred. The Sm and Sc may be present in a total quantity of 0À046 x 10<SP>-5</SP> to 1À1 x 10<SP>-5</SP> gram atom per cm. of arc length, the optimum value being about 0À22 x 10<SP>-5</SP>. The atomic ratio of Sm to Sc may be from 1¢:1 to 1: 2. An alkali metal, preferably Cs, which forms a low vapour pressure iodide, may be added in a quantity of 5À25 x 10<SP>-7</SP> to 6À8 x 10<SP>-5</SP> gram atom per cm. of arc length to stabilize the arc and to ensure that at room temperature there is little or no iodine present in the vapour state. A rare gas such as He, A, Ne, Kr or Xe at a pressure of about 25 torr. is added to facilitate starting. The lamp is otherwise as described in Specification 1,028,228.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US78011768A | 1968-11-29 | 1968-11-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1217799A true GB1217799A (en) | 1970-12-31 |
Family
ID=25118660
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB57696/69A Expired GB1217799A (en) | 1968-11-29 | 1969-11-25 | High pressure electric discharge lamp |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US3577029A (en) |
| JP (1) | JPS4825226B1 (en) |
| GB (1) | GB1217799A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2135502A (en) * | 1983-02-18 | 1984-08-30 | Egyesuelt Izzolampa | High-pressure sodium lamp |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3895251A (en) * | 1974-02-19 | 1975-07-15 | Gte Sylvania Inc | Arc discharge lamp having reduced starting voltage |
| US4310774A (en) * | 1980-03-03 | 1982-01-12 | Gte Products Corporation | Arc discharge lamp containing scandium and scandium halide |
| US5144201A (en) * | 1990-02-23 | 1992-09-01 | Welch Allyn, Inc. | Low watt metal halide lamp |
| US5184044A (en) * | 1990-08-13 | 1993-02-02 | Welch Allyn, Inc. | Dental curing lamp |
| US20080283522A1 (en) * | 2007-05-14 | 2008-11-20 | Shuyl Qin | Translucent polycrystalline alumina ceramic |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3407327A (en) * | 1967-12-21 | 1968-10-22 | Sylvania Electric Prod | High pressure electric discharge device containing mercury, halogen, scandium and alkalimetal |
-
1968
- 1968-11-29 US US780117A patent/US3577029A/en not_active Expired - Lifetime
-
1969
- 1969-11-25 GB GB57696/69A patent/GB1217799A/en not_active Expired
- 1969-11-28 JP JP44096128A patent/JPS4825226B1/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2135502A (en) * | 1983-02-18 | 1984-08-30 | Egyesuelt Izzolampa | High-pressure sodium lamp |
Also Published As
| Publication number | Publication date |
|---|---|
| US3577029A (en) | 1971-05-04 |
| JPS4825226B1 (en) | 1973-07-27 |
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