GB1515583A - Lamps and their manufacture - Google Patents
Lamps and their manufactureInfo
- Publication number
- GB1515583A GB1515583A GB235776A GB235776A GB1515583A GB 1515583 A GB1515583 A GB 1515583A GB 235776 A GB235776 A GB 235776A GB 235776 A GB235776 A GB 235776A GB 1515583 A GB1515583 A GB 1515583A
- Authority
- GB
- United Kingdom
- Prior art keywords
- tube
- lamp
- mandrels
- fused silica
- envelope
- 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
- H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
- H01J9/24—Manufacture or joining of vessels, leading-in conductors or bases
- H01J9/245—Manufacture or joining of vessels, leading-in conductors or bases specially adapted for gas discharge tubes or lamps
- H01J9/247—Manufacture or joining of vessels, leading-in conductors or bases specially adapted for gas discharge tubes or lamps specially adapted for gas-discharge lamps
Abstract
1515583 Discharge lamps THORN ELECTRICAL INDUSTRIES Ltd 18 Jan 1977 [21 Jan 1976] 02357/76 Heading H1D To locate accurately the light source of a lamp, e.g. a Xe or Hg high pressure compact source discharge lamp, a tube 10, e.g. of fused silica with an obstructing web 12 is held on accurately aligned W or Mo mandrels (not shown), wound with W or Mo wire 18. The tube is heated to cause it to collapse under vacuum and grip the wires, after which the mandrels are removed and replaced by rod members 22, 23 of the same size as the mandrels, forming parts of respectively the light source structure 20 and the termination. Mo foil 24 in sheet or strips is laid on the tube, connected to the two rods by welded wires 26, and a further winding 32 of W or Mo is wound round source support rod 23 and extended back on to the Mo foil 24. The whole assembly is fitted inside an extension sleeve 28 of the fused silica lamp envelope 30 and is sealed on a lathe, the sleeve being heated to collapse under vacuum to form a seal at point X, while the wire wrap 32 allows slight sliding of source rod 23 to relieve stress. In a modification the assembly is sealed inside a separate fused silica tube (Fig. 3, not shown) which is finally sealed into an enlarged extension sleeve of the lamp envelope, the seal being near the midpoint of the tube (Fig. 4, not shown) so that the sensitive inner end lies protected within the lamp envelope; a packing piece may cover the outer end. Increased gas pressure may be tolerated in the envelope.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB235776A GB1515583A (en) | 1977-01-18 | 1977-01-18 | Lamps and their manufacture |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB235776A GB1515583A (en) | 1977-01-18 | 1977-01-18 | Lamps and their manufacture |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1515583A true GB1515583A (en) | 1978-06-28 |
Family
ID=9738137
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB235776A Expired GB1515583A (en) | 1977-01-18 | 1977-01-18 | Lamps and their manufacture |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1515583A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0115921A1 (en) * | 1983-02-04 | 1984-08-15 | Osram- Gec Limited | High pressure electric discharge lamp |
EP0858098A2 (en) * | 1997-02-07 | 1998-08-12 | Stanley Electric Co., Ltd. | Metal halide headlamp |
-
1977
- 1977-01-18 GB GB235776A patent/GB1515583A/en not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0115921A1 (en) * | 1983-02-04 | 1984-08-15 | Osram- Gec Limited | High pressure electric discharge lamp |
EP0858098A2 (en) * | 1997-02-07 | 1998-08-12 | Stanley Electric Co., Ltd. | Metal halide headlamp |
EP0858098A3 (en) * | 1997-02-07 | 1998-10-07 | Stanley Electric Co., Ltd. | Metal halide headlamp |
US5936350A (en) * | 1997-02-07 | 1999-08-10 | Stanley Electric Co., Ltd. | Metal halide headlamp |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |