GB889942A - Improvements in and relating to electric discharge lamps - Google Patents
Improvements in and relating to electric discharge lampsInfo
- Publication number
- GB889942A GB889942A GB848357A GB848357A GB889942A GB 889942 A GB889942 A GB 889942A GB 848357 A GB848357 A GB 848357A GB 848357 A GB848357 A GB 848357A GB 889942 A GB889942 A GB 889942A
- Authority
- GB
- United Kingdom
- Prior art keywords
- closure member
- envelope
- ptfe
- pctfe
- 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
- H01J5/00—Details relating to vessels or to leading-in conductors common to two or more basic types of discharge tubes or lamps
- H01J5/32—Seals for leading-in conductors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J5/00—Details relating to vessels or to leading-in conductors common to two or more basic types of discharge tubes or lamps
- H01J5/20—Seals between parts of vessels
- H01J5/22—Vacuum-tight joints between parts of vessel
- H01J5/24—Vacuum-tight joints between parts of vessel between insulating parts of vessel
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2893/00—Discharge tubes and lamps
- H01J2893/0033—Vacuum connection techniques applicable to discharge tubes and lamps
- H01J2893/0037—Solid sealing members other than lamp bases
- H01J2893/0038—Direct connection between two insulating elements, in particular via glass material
Landscapes
- Vessels And Coating Films For Discharge Lamps (AREA)
Abstract
889,942. Discharge lamps. ASSOCIATED ELECTRICAL INDUSTRIES Ltd. June 6, 1958 [March 14, 1957], No. 8483/57. Class 39(1) A tubular discharge lamp which may be fluorescent, is sealed at at least one end by a closure member carrying an electrode, the or each joint of the closure member and the envelope wall incorporating a member made of polytetrafluoroethylene (PTFE) or polymonochlorotrifluoroethylene , (PCTFE) and which is deformable under pressures of the order of atmospheric pressure and which has low vapour pressure in vacuo. In the construction shown in Fig. 1 the closure member 2 is made of glass and a gasket 6 of PTFE or PCTFE is positioned between parallel frustoconical surfaces of the member 2 and the envelope wall 1. In general the pressure difference between the atmosphere and the inside of the envelope maintains the seal, but if the gasket 6 is made of PCTFE the rims of the closure member and the envelope can be heated after assembly in order to cement over the end of the gasket and cause it to adhere to the rims of the closure member and envelope. In the construction shown in Fig. 5 the frusto-conical surface of the closure member 2 is outside the frusto-conical rim of the envelope wall 1. In modifications the closure member is made of metal and the, or each lead to the electrode is brought through the closure member by way of a glass-to-metal seal. In the construction shown in Fig. 2 the closure member 2 is formed of PTFE engaging with the frusto-conical rim of the envelope, and the leads 4, 5 are formed with an enlargement 7 embedded in the closure member. In the construction shown in Fig. 4 the closure member 2 is formed of PTFE and has a lip 10 seating on the reduced neck portion 11 of the envelope 1. The pressure difference between the outer atmosphere and the inside of the envelope expands the rim of the closure member 2 and forms the lip 10 when the member is applied to the heated envelope or is heated in contact with the envelope, Various permutations of the constructions described can be used. In the construction shown in Fig. 6, using a non-pre-heated electrode 3, the closure member 2 is of metal and has a single central contact 12, one end of the electrode being insulated by a glass bead 13. A gasket of PTFE or PCTFE is used and outgassing of the electrode is effected by connection of the closure member and lead 14 to a supply source. Evacuation of the lamps may be effected by the method described in Specification 889,941. According to the Provisional Specification the PTFE or PCTFE can be replaced by a silicone rubber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB848357A GB889942A (en) | 1957-03-14 | 1957-03-14 | Improvements in and relating to electric discharge lamps |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB848357A GB889942A (en) | 1957-03-14 | 1957-03-14 | Improvements in and relating to electric discharge lamps |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB889942A true GB889942A (en) | 1962-02-21 |
Family
ID=9853338
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB848357A Expired GB889942A (en) | 1957-03-14 | 1957-03-14 | Improvements in and relating to electric discharge lamps |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB889942A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2188188A1 (en) * | 1972-06-06 | 1974-01-18 | Asahi Glass Co Ltd | |
| FR2364519A1 (en) * | 1976-09-10 | 1978-04-07 | Thomson Csf | Assembling an electro=optical cell - comprising two plates and PTFE spacer, directly sealed by heat and pressure |
-
1957
- 1957-03-14 GB GB848357A patent/GB889942A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2188188A1 (en) * | 1972-06-06 | 1974-01-18 | Asahi Glass Co Ltd | |
| FR2364519A1 (en) * | 1976-09-10 | 1978-04-07 | Thomson Csf | Assembling an electro=optical cell - comprising two plates and PTFE spacer, directly sealed by heat and pressure |
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