Magnetic Ink Jet with Ink on Demand Capability
Original Publication Date: 1974-Mar-01
Included in the Prior Art Database: 2005-Feb-27
This nonimpact ink droplet printer uses a ferro-fluid ink as the printing media. It consists of an array of nozzles and an array of magnets, each nozzle 11 being coaxial with one magnet 10. The magnet 10 is a permanent magnet whose field may be enhanced or reduced by a coil or current loop 12 wrapped around it or by other means of perturbing the fixed magnetic field. The figure shows one such nozzle-magnet pair. The nozzle 11 is connected to a ferro-fluid reservoir (not shown) such that it is filled with ferro fluid, but, because of the surface tension (at 13), it does not by itself allow fluid to spill from the nozzle.