Rare gaseous discharge lamp, lighting circuit, and lighting device

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(11)

EP 0 948 030 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	29.12.1999 Bulletin 1999/52

(43)	Date of publication A2:
	06.10.1999 Bulletin 1999/40

(21)	Application number: 99302495.9

(22)	Date of filing: 30.03.1999

(51)	International Patent Classification (IPC)⁶: H01J 65/00, H01J 65/04, H01J 61/30

(84)	Designated Contracting States:
	AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
	Designated Extension States:
	AL LT LV MK RO SI

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Priority:

30.03.1998 JP 8473798
29.06.1998 JP 18272998
29.07.1998 JP 21395598
31.07.1998 JP 21634798
19.01.1999 JP 1103199

(71)	Applicant: TOSHIBA LIGHTING & TECHNOLOGY CORPORATION
	Shinagawa-ku, Tokyo (JP)

(72)	Inventors:
	Shimokawa, Teiji Yokohama-shi, Kanagawa-ken 236-0005 (JP) Watanabe, Akio Yokohama-shi, Kanagawa-ken 245-0003 (JP) Yuasa, Kunio Kanagawa-ken 253-0086 (JP) Nishimura, Kiyoshi Yokosuka-shi, Kanagawa-ken 239-0826 (JP)

(74)	Representative: Litchfield, Laura Marie et al
	Haseltine Lake & Co. Imperial House 15-19 Kingsway London WC2B 6UD London WC2B 6UD (GB)

(54)	Rare gaseous discharge lamp, lighting circuit, and lighting device

(57) A rare gaseous discharge lamp arrangement that takes into account the electrostatic capacity of the lamp structure. It's discharge vessel has an outside diameter D mm, thickness t mm, and dielectric constant ε and satisfies the relation

The lamp has at least a pair of electrodes, at least one of which is external.

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