Oki Electro Printer

In terms of its principle of operation, Oki Electro Printer printed on paper by depositing an ion stream controlled by an electric field onto an ink mist. The printer used corona discharge produced by applying a voltage of a few thousand volts to an extremely fine conductor, thereby ionizing molecules such as oxygen and nitrogen in the air around the conductor. On the other hand, ink was agitated using ultrasound, creating a mist of 5-20μ ink drops, and these drifted through the air.