An ink jet recorder of the type where ink from a plurality of nozzles is directed to a record medium for encoding of information onto said medium. The recorder includes scanning electrodes which deflect ink columns formed through the nozzles from side to side so each nozzle throws ink to a selected portion of the medium. At the point of ink droplet formation, charging electrodes induce either a positive or negative charge on each ink droplet. A quadrapole field generating electrode located intermediate the charging electrode and the record member deflects the charged droplets according to a scheme whereby the side to side scanning of positively charged droplets is amplified and negatively charged droplets are guttered and recirculated for reuse by the recorder.

A magnetostatic actuator uses a ferrofluid slug confined in a cylindrical tube which is wrapped in a conducting coil. By applying a current to the coil, a magnetic field is generated inside the coil. The ferrofluid slug may be attracted to the interior of the coil by the interaction of its magnetic moment with the field generated inside the coil. Movement of the ferrofluid slug in response to the magnetic field may be used to actuate various devices, such as a droplet dispenser.

There is provided a magnetic ink jetting apparatus which, when magnetic ink is jetted from an ink jet apparatus, uniformly mixes the pigment and liquid of the magnetic ink and jets it. The magnetic ink jetting apparatus for jetting the magnetic ink with a uniform mixture of pigment and liquid includes a plurality of ink chamber barriers forming an ink chamber for receiving the magnetic ink, and a magnetic layer creating magnetism in the ink chamber so as to concentrate the pigment of the magnetic ink, the magnetic layer being formed between the plurality of ink chamber barriers.

A method for inkjet printing using an ink comprised of an acicular pigment and a solvent in an inkjet printer to print on a recording medium wherein the inkjet printer has an ink reservoir and a print head. The method comprises obtaining the ink comprised of the acicular pigment and the solvent wherein the ink has a first viscosity, filling the ink reservoir of the inkjet printer with the ink, flowing the ink from the ink reservoir to the print head of the inkjet printer, and jetting the ink from the print head of the inkjet printer and onto the recording medium, wherein the ink has a second viscosity upon exiting the print head. An ink formulation(s) comprised of an acicular pigment and a solvent for use in printing images with an inkjet printer. An ink cartridge and an inkjet printing system compatible with an ink comprised of an acicular pigment.