Ozone Generation in Corona Discharge at Pin Electrode of Electrophotography Charger

Hiroyuki Kawamoto*

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review


    The generation of ozone in a stable regime of DC corona discharge at a pin electrode is modeled to provide data that can be utilized for the evaluation of charging and transferring devices of electrophotography with respect to reducing the ozone emission. The results of a theoretical investigation show the following : (1) The ozone generation rates of the 50 μm radius pin electrode are 0.085 ppm/μA and 0.010 ppm/μA under 5 liter/min air flow rate in case of negative corona and positive corona, respectively. The generation rate increases in accordance with the increase of the pin radius. Although the rate of ozone emission is nonlinear with respect to the discharge current, it can be assumed to be approximately linear within the usual design and operation conditions of electrophotography chargers. In case of the positive corona, ozone is formed just at the surface of the discharge electrode, but on the contrary, in case of the negative corona, ozone is formed at about 0.1 mm apart from the tip of the electrode. (2) The ozone generation rate of the charger with saw-tooth electrodes is reduced to about one third of that with a biased charger roller and it is only 1/140 of that with a corotron. The saw-tooth charger has a potential to realize virtually ozone-free charger.

    Original languageEnglish
    Pages (from-to)681-686
    Number of pages6
    JournalNihon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C
    Issue number642
    Publication statusPublished - 2000 Jan 1


    • Corona Discharge
    • Electrophotography
    • Information Processing Equipment
    • Laser Printer
    • Ozone
    • Plasma
    • Precision Instrument

    ASJC Scopus subject areas

    • Mechanics of Materials
    • Mechanical Engineering
    • Industrial and Manufacturing Engineering


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