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Ink jet printer having multiple level grayscale printing

  • US 6,189,993 B1
  • Filed: 03/31/1997
  • Issued: 02/20/2001
  • Est. Priority Date: 03/31/1997
  • Status: Expired due to Term
First Claim
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1. A liquid ink printing system for multiple level grayscale printing, from print data, an image on a recording medium, the recording medium moving in a first direction along a path, and including pixel locations thereon for receipt of liquid ink drops, comprising:

  • a printhead, located adjacent the path, including a plurality of drop ejectors, for selectively depositing one or more liquid ink drops per pixel location on the recording medium;

    an electromover, for moving the recording medium along the path;

    a user interface having a plurality of print quality modes and a plurality of types of recording medium presented for selection by a user prior to printing;

    a print driver, operatively coupled to said electromover, user interface, and to said printhead, the print driver having means for selecting one of a plurality of relative velocities between the recording medium and said printhead in response to a selection of a print quality mode and a type of recording medium from the user interface by a user, said plurality of relative velocities being previously stored in the print driver with each of said plurality of relative velocities being associated with one of a plurality of grayscales, whereby the print driver controls the relative velocity between the printhead and recording medium at the relative velocity and associated grayscale selected by said selecting means.

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