Issue 1300-1

US 6,960,874 B2

Tubular discharge lamp with ignition aid

Gerhard Döll, Ulm (Germany)

Assigned to Patent-Treuhand-Gesellschaft fuer Elektrische Gluehlampen mbH, Munich (Germany)

Appl. No. 10/432,160 PCT Filed Jul. 09, 2002, PCT No. PCT/DE02/02511 § 371(c)(1), (2), (4) Date May 20, 2003, PCT Pub. No. WO03/019616, PCT Pub. Date Mar. 06, 2003.

Claims priority of application No. 101 40 356 (DE), filed on Aug. 17, 2001.

Prior Publication US 2004/0021411 A1, Feb. 05, 2004

Int. Cl.7H01J 61/35

U.S. Cl. 313—488  [313/489; 313/485]

20 Claims

1. A dielectric barrier discharge lamp (1) having a tubular discharge vessel (2), a luminescent material layer (5) on at least a part of the inner wall of the discharge vessel (2) and dielectrically impeded, elongate electrodes (3), which are arranged on the vessel wall in a manner oriented parallel to the longitudinal axis of the discharge vessel (2), at least one end of the tubular discharge vessel (2) is provided with a coating (10; 11) on a partial region of the inner wall, which coating additionally covers an end of at least one elongate electrode (3) and partially covers the luminescent material layer (5), the material of said coating (10; 11) having a high secondary electron emission coefficient.