Method of determining a driving signal of an ink-jet printer head using an image forming device

A method of determining an optimal driving signal specific to a printer head of an image forming apparatus, the method comprising:

• printing a test pattern according to a plurality of sets of driving parameters applied to a driving element in the printer head;
• and
• selecting a set of driving parameters at which the printing is stable, as an optimal set of driving parameters.

A computer readable medium to control an image forming apparatus to determine an optimal driving signal specific to a printer head having a plurality of nozzles and a plurality of corresponding driving elements, the medium comprising:

• first computer readable code to control the image forming apparatus to perform a plurality of printings of a test pattern according to a plurality of driving voltages and a plurality of driving time spans for each driving voltage;
• and
• second computer readable code to control the image forming apparatus to determine the optimal driving signal to eject ink from the printer head from the plurality of driving voltages and the plurality of time spans according to the plurality of printings of the test pattern.

A computer readable medium to perform a method of determining an optimal driving signal of a printer head using an image forming device, the medium comprising:

• first computer readable code to print a test pattern using a plurality of driving signals including a first through Mth driving signals having different driving voltage magnitudes and driving time spans;
• and
• second computer readable code to determine a driving signal that prints the test pattern stably on a piece paper as the optimal driving signal for the image forming device from among the plurality of driving signals.