An ink jet printer comprises a color head having a plurality of nozzles arranged on a head carrier, each of the plurality of nozzles injecting color ink particles by the drive of a piezoelectric element; and a monochrome head having a plurality of nozzles arranged the head carrier, each of the plurality...http://www.google.com.au/patents/US6712450?utm_source=gb-gplus-sharePatent US6712450 - Ink jet printer
