EP 0293138 A1 19881130 - Low pressure sodium lamps.
Title (en)
Low pressure sodium lamps.
Title (de)
Niederdrucknatriumlampen.
Title (fr)
Lampes à sodium à basse pression.
Publication
Application
Priority
GB 8712665 A 19870529
Abstract (en)
A low-pressure vapour electric discharge lamp (L) has a discharge tube filling consisting of neon alone and is connected to a circuit capable of supplying a high frequency current to the lamp. Using a high frequency current means that the lamp can be ignited, even though there is no argon in the discharge tube, contrary to convention. Thus the lamp can be operated a point closer to that of maximum efficacy.
IPC 1-7
IPC 8 full level
H01J 61/22 (2006.01); H01J 61/35 (2006.01); H01J 61/74 (2006.01); H05B 41/24 (2006.01); H05B 41/292 (2006.01)
CPC (source: EP)
H01J 61/22 (2013.01); H01J 61/35 (2013.01); H01J 61/74 (2013.01); H05B 41/2925 (2013.01)
Citation (search report)
- [A] EP 0191537 A1 19860820 - PHILIPS NV [NL]
- [A] DE 1539514 A1 19691106 - PATENT TREUHAND GES FUER ELEKTRISCHE GLUEHLAMPEN MBH
- [A] US 4544863 A 19851001 - HASHIMOTO KEN [JP]
- [A] IEE PROCEEDINGS, vol. 128, no. 6, part A, September 1981, pages 397-414, Old Woking, Surrey, GB; J.W. DENNEMAN: "Low-pressure sodium discharge lamps"
- [A] PATENT ABSTRACTS OF JAPAN, vol. 10, no. 69 (E-389)[2126], 18th March 1986, page 45 E 389; & JP-A-60 218 761 (CANON K.K.) 01-11-1985
Designated contracting state (EPC)
BE DE FR NL
DOCDB simple family (publication)
EP 0293138 A1 19881130; GB 2205197 A 19881130; GB 8712665 D0 19870701; GB 8806215 D0 19880413; JP S63301492 A 19881208
DOCDB simple family (application)
EP 88304564 A 19880520; GB 8712665 A 19870529; GB 8806215 A 19880316; JP 12511888 A 19880524