Patent ID: 6905659

Claim:
An ozonizer comprising: a flat plate-shaped low voltage electrode; a flat plate-shaped high voltage electrode facing a main surface of said low voltage electrode; a flat plate-shaped dielectric and a spacer for forming a discharge gap having a thickness in a laminating direction, located between said low voltage electrode and said high voltage electrode; and a high voltage electrode cooling unit including a cooling water passage insulated from said high voltage electrode and located inside said high voltage electrode, wherein said high voltage electrode cooling unit comprises a thermally conducting and electrically insulating flow tube inserted in a through hole extending through said high voltage electrode, and a thermally conducting adhesive filling space between said flow tube and said through hole, fixing said flow tube in said through hole, and, when an alternating voltage is applied between said low voltage electrode and said high voltage electrode, a discharge is produced in said discharge gap which, when supplied with oxygen, produces ozone gas.