Patent ID: 8337767

Claim:
An ozone generating apparatus, comprising: a sealed vessel; two tube sheets, made of conductive metal having a hole, which are provided so as to divide the inside of the sealed vessel into three spaces; a cylindrical metal tube which is provided so as to connect the holes provided in the two tube sheets; a cylindrical glass tube, whose one side is sealed and the other side is open, having a metal film formed in an inner wall, which is held inside of the metal tube so as to keep a predetermined gap between an outer wall of the cylindrical glass tube and an inner wall of the metal tube; and an alternating high voltage power supply; and having the configuration such that a raw material gas including oxygen is flowed from one space to another space of three spaces in which one space is present at one side and the another space is present at another side of the vessel, through the above-mentioned gap, a power feeding brush comprising a stainless steel brush shaft and a plurality of stainless steel metal thin wires which are fixed to a periphery of the brush shaft, the power feeding brush being inserted into the glass tube, ends of the metal thin wires electrically contact the metal film, wherein a voltage is applied from the alternating high voltage power supply to the metal film by connecting the brush shaft to a power feeding member connected to the alternating high voltage power supply so as to make the metal film to be high electric potential, and to make the metal tube to be ground potential and a material gas flowing in the gap is discharged so as to generate ozone; the following equations satisfy; ( D 2/ D 1)≧1/{1+(1/20β)}, β= N×d 2 /(4× D 2), wherein ‘N’ indicates the number of the metal thin wires per unit length of brush shaft, ‘d’ indicates a wire diameter of the metal thin wire, ‘D 1 ’ indicates an outer diameter of a bundle of metal thin wires, ‘D 2 ’ indicates an outer diameter of the brush shaft and ‘β’ indicates the line density of the metal thin wires on a surface of the brush shaft.