In 1972, Oki Electro Printer, based on a completely new principle, was released. It had the following features:
- 1) Extremely high speed of 8000 line/min.
- 2) No need to use special paper.
- 3) Low printing noise
- 4) Kanji (Chinese characters) and graphics could be printed.
- 5) Fewer mechanical moving parts.
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. These were then sent out by air pressure between the platen and corona source at almost the same speed and in the same direction as paper feed. The ions moved into this ink mist, attaching themselves to the mist particles, moving in the direction created by the electrostatic force and mist stream, and attaching to paper placed in the interval with the platen, thereby achieving printing.
|Oki Electro Printer|
|Printing system||Printing using electric field control of ion stream|
|Character format||Could print all characters and diagrams using the dot format|
|Printing speed||Alphanumeric/kana approx. 8,000line/min
Kanji (Chinese characters) approx. 4,000line/min
Diagrams approx. 128,000dotline/min
|Character composition||Alphanumeric/kana 7×9 dot matrix
Kanji (Chinese characters) 16×18 dot matrix
|Character size||Alphanumeric/kana Vertical2.7mm Horizontal1.8mm
Kanji (Chinese characters) Vertical4.8mm Horizontal4.0mm
|Number of characters||Alphanumeric/kana 128types
Kanji (Chinese characters) Depends on size of pattern generator
|Characters per line||Alphanumeric/kana 136char/line
Kanji (Chinese characters) 68char/line
|Number of dots per line||1360dot|
|Dot spacing||Horizontal 100dot/inch
|Paper||Max. 15inch wide,folding ordinary paper with sprocket holes|