Negative oxygen ions generating device for e.g. dome light of vehicle`s cab interior, has voltage application unit with control unit configured to deliver two levels of predetermined voltages to produce ions of different natures

摘要

The device has a voltage application unit to establish an intense electric field on the level of an emissive end (12) of needles (11). The voltage application unit has a control unit configured for delivering two levels of predetermined voltages between a support plate (2) and conductive coating (5) of a cover plate (3) to produce ions of different natures, where the application unit is shared by switch blocks.