Ionization device and method to manufacture thereof

Method of producing an ionizing device characterized in comprising the following steps:

• providing a tubular bulb (2) made from an electrically insulating or a dielectric material, extending along a longitudinal reference axis (A) and having at least one longitudinal open terminal end (3)(4);
• engaging a tubular cathode (9) onto an internal surface of said bulb (2);
• fitting a tubular anode (10) onto the external surface of said bulb (2);
• provide a conducting electrode (11) which comprises a stem (13) and a plurality of conductive crowns (12), which are fit onto said stem (13) at pre-established distances one after the other along the longitudinal axis of said stem (13);
• positioning said conductive electrode (11) within said bulb (2) so as to arrange said conductive crowns (12) into contact with the internal surface of said tubular cathode (9) in such a manner so as to exert an elastic compression onto said tubular cathode (9) against the internal surface of said bulb (2) at a plurality of points axially distanced between one another along said axis (A),
• hermetically closing said at least one terminal end (3)(4) od said bulb (2) through a relative closing cover (5)(6),
• wherein:
• said bulb (2) has two opposite longitudinal open terminal ends (3)(4),
• the method comprising the step of coupling the two covers (5)(6) onto said opposing terminal ends (3)(4) of said bulb (2) so as to close the terminal ends (3)(4);
• the method further comprises the step of mechanically connecting said covers (5)(6) between one another through said conducting electrode (11) so as to exert a compression onto said covers (5)(6) along said axis (A) against the edges of said covers (5)(6) of said bulb (2) so as to hermetically closing these.