Method and apparatus for changing the picture point resolution of continuous tone pictures during transition from reproduction to recording
Method and apparatus for controlling drying and detaching of printed material
Jet recording apparatus with means for controlling power to fixing heaters according to the number of printed dots in regions corresponding to each heater
Heater blower system in a color ink-jet printer
Ink jet recording apparatus provided with fixating means
Method for increased print resolution in the carriage scan axis of an inkjet printer
Densitometer for adaptive control of ink drying time for inkjet printer Patent #: 5608439
ApplicationNo. 549900 filed on 10/30/1995
US Classes:347/102, Drying or curing347/16Of medium
ExaminersPrimary: Fuller, Benjamin R.
Assistant: Annick, Christina
Attorney, Agent or Firm
Foreign Patent References
International ClassB41J 002/01
AbstractAn inkjet printer whereby high density graphics images can be printed without smearing and without either a reduction of print speed or a degradation of print quality is disclosed. Previous methods of inducing drying on inkjet output in printers with heaters did not use print density to adjust heater output. Heater output was simply adjusted based on the type of media so destruction of the media did not take place. The media was given enough time to dry by either lowering the print speed of the printer or utilizing special multi-pass print modes. As a result, the throughput of the printer was reduced. The disclosed inkjet printer allows for greater heater drying to be applied to output printed with greater densities of ink. The inkjet printer comprises a carriage mounted inkjet printing mechanism for applying liquid ink to a print medium as successive columns of dots contained within horizontal swaths to thereby form a portion of the image of an image to be printed on a sheet of print media. The printer and method comprises the steps determining a maximum density of dots in a first horizontal swath, applying a variable quantity of heat to the media based upon the maximum density of said dots and the nature of the print media, and moving a plurality of inkjet nozzles across the print medium and applying a specified amount of liquid ink from specified inkjet nozzles onto the print medium as successive columns of dots contained within a first swath of the image. The maximum print density can be calculated by counting drops of ink in each of several overlapping grids. Thus, the inkjet printer utilizes information about the print density to control the heater output level rather than controlling the print speed of the inkjet printer, or using multi-pass print modes which reduce printer throughput. Similarly, this invention can be applied to print devices that control air flow or fan speed or any other device that provides direct drying of printed media based on the analysis of the ink density of the printing being performed.