| 摘要 |
<p>PURPOSE:To make inconspicuous a step in the subscanning direction of a line by a method wherein adjacent ones of all heating elements on a thermal head are electrically heated so as to be partically overlapped with each other in conduction heating time. CONSTITUTION:Printing data signals DA1 - DA8 from adjacent drivers are issued so as to successively heat adjacent heating elements r1 - r8 at a heating start timing with a 2gamma delay. In this manner, adjacent heating resistors are partially overlapped with each other in heating time. Before one of adjacent heating resistors completes a heat generation, i.e. starts a heat discharge, the other one starts a heat generation. Therefore, it is ensured that adjacent two heating resistors are simultaneously heated during a fixed time. Thus, even in a continuous printing, the thermal interaction of the adjacent heating resistors at the time of heat generation never causes an unwanted white line to be generated on a recording medium in a subscanning direction.</p> |
