Printing apparatus and printing method

Details Printing apparatus and printing method Printing apparatus and printing method

2011-03-08

2011-03-08

Nguyen, Lam S (Department: 2853)

Incremental printing of symbolic information

Ink jet

Controller

C347S009000, C347S011000

Reexamination Certificate

active

07901020

ABSTRACT:
In printing of multi-level darkness/lightness of a certain color, which is performed with a dark ink and a light ink of the certain color, graininess is improved. A printing method includes generating a plurality of types of drive signals, and ejecting the dark ink and the light ink from a head, an amount of each ink varying for each dot tone value. In generation of a plurality of the types of the drive signals, a plurality of the types of drive signals are generated, where a waveform section that is for the dark ink of the certain color and that corresponds to a minimum dot tone value in ejection of ink is different from a waveform section that is for the light ink of the certain color and that corresponds to the minimum dot tone value, and where a waveform section that is for the dark ink of the certain color and that corresponds to a maximum dot tone value is different from a waveform section that is for the light ink of the certain color and that corresponds to the maximum dot tone value. In ejection of the dark ink and the light ink from the head, a drive signal that is generated based on a type of the dot tone value designated according to a size of a to-be-formed dot and based on a type of the ink is applied to an element that is provided on the head and that performs an operation for ejecting ink.

REFERENCES:
patent: 6494556 (2002-12-01), Sayama et al.
patent: 2003/0016257 (2003-01-01), Asauchi et al.
patent: 10-193587 (1998-07-01), None

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