High-pressure sodium lamp - Patent 0523782

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(11)

EP 0 523 782 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	10.02.1993 Bulletin 1993/06

(43)	Date of publication A2:
	20.01.1993 Bulletin 1993/03

(21)	Application number: 92202047.4

(22)	Date of filing: 07.07.1992

(51)	International Patent Classification (IPC)⁵: H01J 61/073, H01J 61/82

(84)	Designated Contracting States:
	BE DE FR GB IT NL

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Priority:

12.07.1991 EP 91201820

(71)	Applicant: Philips Electronics N.V.
	5621 BA Eindhoven (NL)

(72)	Inventors:
	Jacobs, Cornelis Adrianus Johannes NL-5656 AA Eindhoven (NL) Dielis, Harald René NL-5656 AA Eindhoven (NL) Meeuwssen, Marina Maria Josepha NL-5656 AA Eindhoven (NL)

(74)	Representative: Evers, Johannes Hubertus Maria et al
	INTERNATIONAAL OCTROOIBUREAU B.V, Prof. Holstlaan 6 5656 AA Eindhoven 5656 AA Eindhoven (NL)

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References cited: :

(54)	High-pressure sodium lamp

(57) A high-pressure sodium lamp of the invention radiates white light with a colour temperature higher than 2250 K. The lamp is provided with a discharge vessel (1) with a ceramic wall (2). In the discharge vessel (1), electrodes (10a, 10b) are arranged which are connected to current supply conductors (20a, 20b) which are passed through the wall (2) in a gastight manner. The electrodes (10a, 10b) each have a rod (11a) ending in a tip (12a) and with a length l and diameter d. The rod (11a) of the electrodes (10a, 10b) is provided with a single winding (13a) of a wire with a diameter of at most d/3, which winding (13a) is remote from the tip (12a) of the rod (11a) over a distance of at most 2d. This construction enables a quick ignition of the lamp.

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