Patent ID: 7394199
Filing Date: 2008-07-01
Classification: H01J

Abstract:
1. Cathode unit for installation in a fluorescent tube body ( 3 ) belonging to a fluorescent tube ( 1 ), which cathode unit ( 5 ) comprises a cathode screen ( 15 a , 15 , 15 ′- 15 ″″), which partially surrounds an electrode ( 9 ) which is electrically insulated from the said cathode screen ( 15 ), a power supply device ( 11 ) arranged to make an electrical connection between the said electrode ( 9 ) and a contact ( 13 ), the said cathode screen ( 15 ) comprising a first end ( 19 ) facing towards the discharge, which first end ( 19 ) comprises a central opening ( 21 ), and a second end ( 39 ) facing towards the said contact ( 13 ), characterised in that the first end ( 19 ) of the cathode screen ( 15 a , 15 , 15 ′- 15 ″″) is designed with a rounded-off part ( 25 ) in order to facilitate the insertion of the cathode unit ( 5 ) in the said fluorescent tube body ( 3 ).