| 摘要 |
PURPOSE:To make the replacing periods of a plurality of recording head parts equal and to reduce the replacing number of times of the recording heads and the interrupting number of times of recording. CONSTITUTION:A recording head part 22K relatively low in use frequency and a recording head part 22U relatively high in use frequency are composed of heat generating materials different in characteristics and the periods from the start of use of the recording heads to the replacement thereof at the time of the driving of the respective recording heads in the respective use frequencies are made almost the same. Recording is carried out using those recording head parts 22K, 22U. |
