GB397887A - Improvements in and relating to electric lamps - Google Patents
Improvements in and relating to electric lampsInfo
- Publication number
- GB397887A GB397887A GB5558/32A GB555832A GB397887A GB 397887 A GB397887 A GB 397887A GB 5558/32 A GB5558/32 A GB 5558/32A GB 555832 A GB555832 A GB 555832A GB 397887 A GB397887 A GB 397887A
- Authority
- GB
- United Kingdom
- Prior art keywords
- filament
- coils
- arc
- tungsten
- leads
- 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
- H01J61/84—Lamps with discharge constricted by high pressure
- H01J61/86—Lamps with discharge constricted by high pressure with discharge additionally constricted by close spacing of electrodes, e.g. for optical projection
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/96—Lamps with light-emitting discharge path and separately-heated incandescent body within a common envelope, e.g. for simulating daylight
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B31/00—Electric arc lamps
- H05B31/0018—Electric arc lamps in a closed vessel
- H05B31/0027—Electric arc lamps in a closed vessel with special gasfilling
Landscapes
- Discharge Lamp (AREA)
- Machines For Laying And Maintaining Railways (AREA)
Abstract
397,887. Electric lamps. BRITISH THOMSON-HOUSTON CO., Ltd., Crown House, Aldwych, London.-(Assignees of Strickland, R. F.; 2227, Noble Road, Cleveland Heights, Ohio, U.S.A.) Feb. 24, 1932, No. 5558. Convention date, Feb. 25, 1931. [Class 39 (i).] In lamps such as those described in Specification 317,832, [Class 39 (i), Electric lamps, Arc, &c.], in which a sealed bulb 10 filled with inert gas or vapour contains current leads 11, 12, arc electrodes 19, 20 and a filament 18 across the leads 11, 12 so that, at starting, the filament glows first and the arc then strikes, the electrodes 19, 20 are formed as coils and parts of the filament 18 adjacent its ends are disposed within these coils, the difference between the starting and operating voltages being thus reduced. The coils 19, 20 may be of tungsten and the leads 11, 12 of nickel with tungsten parts sealed into the stem 13. The filament 18 is a tungsten coil extending towards a pool 21 of vaporizable metal such as mercury, and the bulb 10 is of borosilicate glass transmitting ultra - violet rays. In a modification, the filament is curved upwardly away from the pool 21 and is supported at its centre by an anchor from the stem 13. The lamp may be supplied by a transformer with a drooping characteristic.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US40139XA | 1930-04-22 | 1930-04-22 | |
| US518146A US2104680A (en) | 1931-02-25 | 1931-02-25 | Enclosed arc device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB397887A true GB397887A (en) | 1933-08-24 |
Family
ID=31890651
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB11934/31A Expired GB375477A (en) | 1930-04-22 | 1931-04-22 | Improvements in and relating to electric lamps |
| GB5558/32A Expired GB397887A (en) | 1930-04-22 | 1932-02-24 | Improvements in and relating to electric lamps |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB11934/31A Expired GB375477A (en) | 1930-04-22 | 1931-04-22 | Improvements in and relating to electric lamps |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE552547C (en) |
| GB (2) | GB375477A (en) |
| NL (1) | NL36515C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE977321C (en) * | 1950-04-13 | 1965-12-16 | Gen Electric | Low-pressure gas discharge lamp and circuit arrangement for their ignition and operation |
-
0
- NL NL36515D patent/NL36515C/xx active
-
1931
- 1931-04-22 GB GB11934/31A patent/GB375477A/en not_active Expired
- 1931-06-19 DE DEP63317D patent/DE552547C/en not_active Expired
-
1932
- 1932-02-24 GB GB5558/32A patent/GB397887A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB375477A (en) | 1932-06-30 |
| DE552547C (en) | 1932-06-15 |
| NL36515C (en) |
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