Inkjet printing apparatus

摘要

An inkjet printing apparatus is provided that reduces a period required for detection of the ink ejection state for the individual ejection ports of a print head. The inkjet printing apparatus includes a carriage moving unit for moving a carriage in the main scan direction that crosses a conveyance direction in which a printing medium is to be conveyed. The inkjet printing apparatus also includes an LED and a photodiode, for receiving light emitted by the LED, both of which are employed to detect the ink ejection state for the ejection ports to be examined. The inkjet printing apparatus moves the LED and the photodiode in the main scan direction to move the inspection position, at which the ink ejection state is to be examined.

主权项

1. An inkjet printing apparatus for performing printing on a printing medium comprising:
a print head including an ejection port array including a plurality of ejection ports to eject ink; a scanning unit, on which the print head is mounted to perform scanning in a first direction; an examination unit, including a light source and a light receiving device, for receiving light emitted by the light source, so as to be able to perform examination of an ink ejection state for a target ejection port based on an output change of the light receiving device when an ink droplet ejected from the target ejection port is passed between the light source and the light receiving device; and an inspection position moving unit on which the examination unit is mounted, for moving in the first direction, wherein the inspection position moving unit has positioning accuracy higher than that of the scanning unit.