THERMAL RECORDING APPARATUS

摘要

PURPOSE:To perform high speed recording corresponding to the density of a pixel by detecting heating elements to be driven on the basis of the distribution of the pixel density of one row to be recorded to judge the heating elements drivable simultaneously and simultaneously driving the heating elements drivable simultaneously each other corresponding to the judge result and driving the heating elements undrivable simultaneously in a time differential manner. CONSTITUTION:A division judge circuit 15 is driven under control on the basis of the clock signal CK from a timing clock generation circuit 10 and the start signal from a CPU 24 to determine 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 during one scanning line and forms division judge data Ln indicating the combinations of groups at the times of simultaneous current supply driving and time differential current supply driving. A PIO 22 is controlled by the CPU 24 and inputs the division judge data Ln from the division judge circuit 15 to output a control signal Sb to a motor driver 18 for driving pulse motors 16, 17.