Ion generator

摘要

An ion generator ( 10 ) generally includes: a shielding shell ( 11 ), a cathode device ( 16 ), and an annular anode ( 14 ). The shielding shell has a first end ( 113 ), an opposite second end ( 115 ) and a main body ( 111 ) therebetween. The first end has an electron-input hole ( 13 ). The second end has an ion-output hole ( 15 ). The main body has a gas inlet ( 170 ) for introducing an ionizable gas ( 170 ). The cathode device faces the electron-input hole for emitting electrons to enter the shielding shell so as to ionize the ionizable gas thereby generating ions. The cathode device includes a conductive base ( 160 ) and at least one field emitter ( 161 ) thereon. The annular anode is arranged in the shielding shell. The anode is aligned with the ion-output hole.