EP 0245735 B1 19930210 - HIGH-PRESSURE DISCHARGE LAMP, AND METHOD OF OPERATING THE HIGH-PRESSURE DISCHARGE LAMP
Title (en)
HIGH-PRESSURE DISCHARGE LAMP, AND METHOD OF OPERATING THE HIGH-PRESSURE DISCHARGE LAMP
Publication
Application
Priority
DE 3616192 A 19860514
Abstract (en)
[origin: US4779026A] To provide for pre-heating of low-power small metal halide high-pressure discharge lamps (1), at least one of the electrodes (16) is formed as a heater wire by introducing a thin tungsten wire, in V shape, into one end of the elongated bulb (2), and carrying out each one of the legs of the V, separately, and electrically insulated within an end press seal (4) by parallel foils (10, 11) externally of the bulb. Continuous heater current is caused to flow through the V-shaped wire electrode, thus heating the discharge vessel, to complete vaporization of the fill. To start the lamp, the two legs of the V, of the heater electrode, are connected in parallel and across the lamp operating voltage and then a high-voltage pulse is applied between the V-shaped heater electrodes, for example between one or both of the external conductors and the other electrode (9). Light output, upon starting, is substantially accelerated from a lamp of this type with respect to non-preheated lamps.
IPC 1-7
IPC 8 full level
H01J 61/073 (2006.01); H01J 61/52 (2006.01); H01J 61/82 (2006.01)
CPC (source: EP US)
H01J 61/073 (2013.01 - EP US); H01J 61/827 (2013.01 - EP US)
Citation (examination)
- US 3937996 A 19760210 - CAP DANIEL M
- EP 0175937 A2 19860402 - GTE PROD CORP [US]
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
EP 0245735 A2 19871119; EP 0245735 A3 19891102; EP 0245735 B1 19930210; DE 3616192 A1 19871119; DE 3784094 D1 19930325; JP S62272451 A 19871126; US 4779026 A 19881018
DOCDB simple family (application)
EP 87106403 A 19870504; DE 3616192 A 19860514; DE 3784094 T 19870504; JP 11606687 A 19870514; US 3966287 A 19870417