Patent attributes
A recording apparatus includes a recording head having nozzles ejecting ink onto a recording medium, a conveying unit that conveys the recording medium, and a carriage. A sensor is mounted on the carriage for detecting image density. A detection controller that performs control to record test patterns on the recording medium and read densities of the test patterns using the sensor to thereby detect a non-ejection nozzle of the recording head. The test patterns are formed by recording a line including a predetermined number of dots in predetermined areas for respective nozzles every plurality of times of conveyance of the recording medium. The detection controller reads the test patterns using the sensor, calculates a position of a non-recorded portion in the test patterns, and specifies a position of the non-ejection nozzle based on the calculated position of the non-recorded portion and positions of the nozzles that record the test patterns.
