Inkjet printing apparatus and inkjet printing method

#1. Field of the Invention

#The present invention relates to an inkjet printing apparatus. In particular, the present invention relates to an inkjet printing apparatus that, with use of an inkjet print head provided with a printing element substrate on which electrothermal transducing elements are arrayed, prints an image while detecting a temperature of the printing element substrate.

#2. Description of the Related Art

#FIG. 1 is a perspective view illustrating an internal configuration of an inkjet printing apparatus usable in the present invention;

#FIG. 2 is an outside perspective view of a print head H;

#FIG. 3 is a diagram illustrating part of a drive control circuit for one printing element array on a printing element substrate;

#In the following, an embodiment of the present invention is described in detail with reference to the drawings.

#FIG. 1 is a perspective view illustrating an internal configuration of an inkjet printing apparatus used in the present embodiment. A print head H (not illustrated) attachable/detachable to/from a carriage M4001 is attached inside the carriage M4001 by a head set lever M4007 with engaging with a carriage cover M4002. The carriage M4001 can reciprocate in an X direction in the view with use of a carriage motor E0001 as a drive source with being guided and supported by a carriage shaft M4021. During the reciprocation, the print head H ejects ink droplets in a −Z direction toward a currently conveyed print medium according to a driving signal. Print data, and a temperature sensor output signal from a printing element substrate, which are required for the print head H to perform the ejection, are transceived through a cable 305 and a carriage board 304 fixed to the carriage M4001. The cable 305 makes an electrical connection between the carriage M4001 and a main board 306 fixed to a chassis M3019 with following the reciprocation of the carriage M4001.

#A print medium (not illustrated) placed on a paper feed tray M3022 is fed into the apparatus, and then with being placed between a roller pair of a conveying roller M3006 and a pinch roller M3029, conveyed in a Y direction in the view along with rotation of the roller pair. A print scan in the X direction by the print head H mounted inside the carriage M4001, and a conveying operation of the print medium, which corresponds to a print width of the print head H, are alternately repeated, and thereby the print medium is printed with an image in a stepwise manner, and then discharged from a discharge port M3030.