| 摘要 |
PROBLEM TO BE SOLVED: To carry out stable detection of nozzles in a short time by reducing effects of optical diffraction and conducting detection at once without moving a head for all nozzles in one nozzle array. SOLUTION: There are provided a light emitting means for ejecting a detection light to intersect a trajectory of ink droplets discharged from the nozzles of a recording head which has the nozzle array with a plurality of the nozzles arranged, a light receiving means for detecting whether or not the ink droplets pass in an optical path of the detection light by receiving the detection light, a discharge control means for controlling to discharge the ink droplets sequentially in time series towards the optical path of the detection light from all of the nozzles of the recording head, and a discharge defective nozzle specifying means for specifying discharge defective nozzles by detecting a discharge state of the ink droplets from the nozzles on the basis of a timing of discharging of the ink droplets by the discharge control means and a passage detection timing of the ink droplets by the light receiving means. COPYRIGHT: (C)2006,JPO&NCIPI
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