Device for preparing a plasma for the production of ozone and/or oxygen ions in the air

A device to generate a plasma for the production of ozone and/or oxygen ions in the air, based on the principle of dielectrically impeded discharge, with two electrodes (3, 4) to which a high voltage from an alternating voltage generator is applied and between which an electrically insulating element is situated, wherein

• a) the element consists of a flat, electrically insulating carrier (1, 7), whose material has a dielectric constant εr carrier which is greater than 50 (in words, εr carrier>fifty) or at least greater than 30 (in words, εr carrier>thirty),
• b) a flat electrode (4), as a lower electrode (4), made of an electrically conductive material, is applied onto a rear one of main surfaces of the carrier (1, 7),
• c) at least one electric insulating layer (2, 8) made of a dielectric material is applied onto the other main surface of the carrier (1, 7), the front, which is adapted to be exposed to air, wherein the insulating layer (2, 8) only partially covers the front of the carrier (1, 7),
• d) the dielectric constant of the carrier (1,7) and that of the insulating layer (2, 8) are different, wherein, at a dielectric constant of the carrier (1, 7) of εr carrier>fifty, the dielectric constant of the insulating layer (2, 8) is between 50>εr insulating layer>5 and, at a dielectric constant of the carrier (1, 7) of εr carrier>thirty, the dielectric constant of the insulating layer (2, 8) is between 30>εr insulating layer>5, for allowing a mirror discharge effect to occur, and
• e) a band-shaped electrode (3, 10), as an upper electrode (3), made of an electrically conductive material that only partially covers the insulating layer (2, 8), is directly situated on the insulating layer (2, 8).