| 摘要 |
<p>PURPOSE:To perform the high speed recording corresponding to pixel density by detecting heating elements to be driven on the basis of the distribution of the pixel density of one row to be recorded to mutually drive the heating elements at the same time or in a time differential manner and performing the transfer driving of recording paper by setting the number of times of time differential driving to a cycle. CONSTITUTION:A division judge circuit 15 is driven under control on the basis of the clock signal CK from a timing clock generating circuit 10 and the start signal from a CPU 24 and determines whether the respective groups G1-G4 constituting a thermal head 14 are driven by the supply of a current at the same time or in a time differential manner, on the basis of the distribution of the black pixel data in one scanning line to form division judge data Ln. A sub-scanning pixel density detection circuit 21 detects the pixel density of a manuscript in a sub-scanning direction. Since the obtained division judge data Ln shows the combination data of the groups G1-G4 of heating elements, the heating elements are subjected to division driving and the interval for feeding the manuscript or recording paper in the sub-scanning direction corresponding to the number of divisions, that is, the interval for driving the first and second pulse motors 16, 17 is determined.</p> |
