Method and apparatus for recording with writing fluids and drop projection means therefor
Ink jet system printer of the charge amplitude controlling type capable of printing different size characters
Method and apparatus for simultaneously outputting a graphic signal and an alphanumeric signal by using an image reproducing system
Elongated fluid jet printing apparatus
Image forming method using image forming elements having different concentrations and pitches
Ink jet printer
Multitone ink jet printer and method of operation
Thermal ink jet printhead fabricating process
ApplicationNo. 770272 filed on 10/03/1991
US Classes:347/15, Creating plural tones347/40, Array of ejectors347/56, With thermal force ejection400/82INCLUDING PLURAL, INDEPENDENTLY SUPPORTED KEY-BOARDS, PLATENS, OR TYPE-SET ASSEMBLAGES
ExaminersPrimary: Hartary, Joseph W.
Attorney, Agent or Firm
Foreign Patent References
International ClassesB41V 002/05
AbstractA printhead for a thermal ink jet printer, preferably a roofshooter type printer, includes at least two arrays of linear spaced apart nozzles and heating elements, each array having a different resolution to produce printed pages at a draft print using a low resolution array, at a letter quality print using a high resolution array, or a combination of both arrays to provide enhanced grey scale reproduction. The high resolution array allows for accurate reproduction at a reduced throughput while the low resolution array allows for moderate reproduction at a higher throughput. Alternatively, the two arrays could be used simultaneously to provide a fast, broad, coarse stroke and a slower, fine detail stroke.