A corona igniter (20) includes a metal shell (32) with a corona reducing lip (38) spaced from an insulator (26) and being free of sharp edges (40) to prevent arcing (42) in a rollover region and concentrate the electrical field at an electrode firing end (48). The corona reducing lip (38) includes lip outer surfaces (88) being round, convex, concave, or curving continuously with smooth transitions (90) therebetween. The corona reducing lip (38) includes lip outer surfaces (88) presenting spherical lip radii (r.sub.1) being at least 0.004 inches. The corona igniter (20) also includes shell inner surfaces (104) and insulator outer surfaces (75) facing one another being free of sharp edges (40).

A corona igniter (20) includes a metal shell (32) with a corona reducing lip (38) spaced from an insulator (26) and being free of sharp edges (40) to prevent arcing (42) in a rollover region and concentrate the electrical field at an electrode firing end (48). The corona reducing lip (38) includes lip outer surfaces (88) being round, convex, concave, or curving continuously with smooth transitions (90) therebetween. The corona reducing lip (38) includes lip outer surfaces (88) presenting spherical lip radii (r.sub.1) being at least 0.004 inches. The corona igniter (20) also includes shell inner surfaces (104) and insulator outer surfaces (75) facing one another being free of sharp edges (40).

A wearable air purifier includes at least one wearable component, a control unit, at least one speaker assembly and at least one negative ion generating component. The control unit is disposed inside the at least one wearable component. The at least one speaker assembly is disposed on the at least one wearable component and electrically connected to the control unit. The at least one negative ion generating component is disposed on the at least one wearable component and electrically connected to the control unit. The control unit provides high-voltage currents to the at least one negative ion generating component to enable the at least one negative ion generating component to emit negative ions by corona discharging, and the control unit further provides audio signals to the at least one speaker assembly to activate the at least one speaker assembly to generate sound.

A wearable air purifier includes at least one wearable component, a control unit, at least one speaker assembly and at least one negative ion generating component. The control unit is disposed inside the at least one wearable component. The at least one speaker assembly is disposed on the at least one wearable component and electrically connected to the control unit. The at least one negative ion generating component is disposed on the at least one wearable component and electrically connected to the control unit. The control unit provides high-voltage currents to the at least one negative ion generating component to enable the at least one negative ion generating component to emit negative ions by corona discharging, and the control unit further provides audio signals to the at least one speaker assembly to activate the at least one speaker assembly to generate sound.

An ignition plug 10 comprises an elongate cylindrical body 12 of an electrically insulating material having a first end 12.1, a second end 12.2 opposite to the first end and a first face 14 at the first end. A first elongate electrode 16 having a first end 16.1 and a second end 16.2 extends longitudinally in the body. The first electrode terminates at the first end thereof a first distance d1 from the first end of the body in a direction towards the second end of the body. The body hence defines a blind bore 18 extending between the first end of the first electrode and the first end of the body. A second electrode is provided on an outer surface of the body and terminates at one of a) flush with the first face 14 of the body and b) a second distance d2 from the first end of the body in a direction towards the second end of the bod.

An ignition plug 10 comprises an elongate cylindrical body 12 of an electrically insulating material having a first end 12.1, a second end 12.2 opposite to the first end and a first face 14 at the first end. A first elongate electrode 16 having a first end 16.1 and a second end 16.2 extends longitudinally in the body. The first electrode terminates at the first end thereof a first distance d1 from the first end of the body in a direction towards the second end of the body. The body hence defines a blind bore 18 extending between the first end of the first electrode and the first end of the body. A second electrode is provided on an outer surface of the body and terminates at one of a) flush with the first face 14 of the body and b) a second distance d2 from the first end of the body in a direction towards the second end of the bod.

According to an aspect of the present disclosure, a position adjustment mechanism is provided for automatically adjusting the position of an electrode relative to a ground roller in a corona treatment apparatus. The position adjustment mechanism is capable of detecting thickened areas in a web of material that is being treated and automatically adjusting the air gap to maintain the quality of the surface treatment of the web.

According to an aspect of the present disclosure, a position adjustment mechanism is provided for automatically adjusting the position of an electrode relative to a ground roller in a corona treatment apparatus. The position adjustment mechanism is capable of detecting thickened areas in a web of material that is being treated and automatically adjusting the air gap to maintain the quality of the surface treatment of the web.

An intake device for a vehicle, in which an intake passage wall surface defining an intake passage is charged with positive charges, includes: a self-discharge static eliminator that is provided on the intake passage wall surface and that decreases an electrification charge amount on that part of the intake passage wall surface which is within a limited range around a mounting part of the self-discharge static eliminator, by providing the self-discharge static eliminator on the intake passage wall surface.

Ionizers having carbon nanotube (CNT) ion emitting heads of the present invention include ionization circuitry supplying voltage at ionization potential and carbon nanotube (CNT) ion emitters operatively connected thereto. The carbon nanotube (CNT) ion emitters are mechanically and electrically stable, provide good ion flows for air purification and/or air invigoration when actuated at ionization potential and are capable of prolonged use in highly polluted environments.