US Patent 7347520 Inkjet printing apparatus and information processing method

Ink viscosity information of an inkjet printing apparatus can be provided at low cost in small space. The inkjet printing apparatus performs image printing by using a printhead with a plurality of nozzles from which ink is discharged. This inkjet printing apparatus includes a switching unit which switches to a test print mode for providing the ink viscosity information. The inkjet printing apparatus also includes an image printing unit which prints a predetermined image in response to a plurality of driving pulses with different frequencies to obtain a test print pattern, when the switching unit switches to the test print pattern.