| 摘要 |
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 a, 15 , 15 '- 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 ). 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 ). |
