The best known process of electrostatic printing is known as xerography.2. A procedure in which a positive electrostatic charge is given to a paper on which an image is projected.
A bright light reverses the charge of the non-image area so that the negatively charged powdered ink sticks firmly only to the positive image area.
Established by the Xerox Corporation, it is about the most common dry photocopying process in use today.3. A plotter or computer output device that draws graphs and other pictorial images on paper which uses an electrostatic method of printing.
Liquid toner models use a positively charged toner that is attracted to paper which is negatively charged by passing by a line of electrodes (tiny wires or nibs).
Models print in black and white or color, and some handle paper up to six feet wide.
Newer electrostatic plotters are really large-format laser printers and focus light onto a charged drum using lasers or LEDs (light-emitting diodes) which is a semiconductor that emits light when a current passes through it.