Patent Number: 6,305,776

Title: Method for judging discharge state of ink jet recording head, and ink jetrecording apparatus utilizing the same

Abstract: The temperature characteristics of an ink jet recording head are detected,and the result of detection is utilized for detecting the ink dischargestate. Also a statistical processing on the temperature characteristicsdetected on plural recording heads enables exact detection of the inkdischarge state, not effected by the individual difference of therecording heads. Also there is detected the abnormality in ink discharge,that may occur prior to the exhaustion of ink in the ink tank.

Inventors: Ohshima; Noriyoshi (Tokyo, JP), Shimamura; Yoshiyuki (Yokohama, JP), Takahashi; Seiji (Yokohama, JP)

Assignee:

International Classification:

Expiration Date: 10/23/2013