Magnetic Mist Printing With A Bias Magnetic Field
Original Publication Date: 1979-Nov-01
Included in the Prior Art Database: 2005-Feb-20
Magnetic mist printing involves attracting ferrofluid mist droplets to specific areas on a piece of paper. The specific areas are delineated by a local magnetic field source just under the paper. The magnetic field has two effects: the field induces a magnetic moment, M, onto each droplet, and the gradient of the magnetic field attracts these polarized mist particles. Because the magnetic field, H, enters into both these effects (as H and (Image Omitted) H or, as shown in (1), as (Image Omitted) H/2/ altogether) and because H often drops off rapidly with distance, the magnetic field can only attract droplets which are close (<300 Mu) to the paper.