公开(公告)号：US5608442A

公开(公告)日：1997-03-04

申请号：US299291

申请日：1994-08-31

申请人： David H. Bennefeld ,  Jonathan D. Elliot ,  Danny J. Vatland ,  John M. Gilbert

发明人： David H. Bennefeld ,  Jonathan D. Elliot ,  Danny J. Vatland ,  John M. Gilbert

IPC分类号： B41J2/35 ,  B41J2/365 ,  B41J2/37 ,  B41J2/36

CPC分类号： B41J2/365 ,  B41J2/37

摘要： A thermal printer includes a thermal print head having a plurality of heating elements for printing dots. A source of drive pulses operates respective heating elements. Each drive pulse is modulated to provide first and second periods of the drive pulse to selectively energize the respective heating element, the first and second periods defining a selected energy level. A memory stores the modulated drive pulses and supplies respective modulated drive pulses to the respective heating elements. A measuring circuit measures a heating factor of each heating element and provides a correction factor for each heating element based on the respective measured heating factor. The correction factors are combined to the respective drive pulses to alter the first and second periods, thereby reducing variations in dots due to differences in the heating factors of the heating elements.

摘要翻译： 热敏打印机包括具有用于打印点的多个加热元件的热​​打印头。 驱动脉冲源操作相应的加热元件。 调制每个驱动脉冲以提供驱动脉冲的第一和第二周期，以选择性地激励相应的加热元件，第一和第二周期限定选定的能级。 存储器存储调制的驱动脉冲，并将相应的调制驱动脉冲提供给相应的加热元件。 测量电路测量每个加热元件的加热系数，并且基于相应测量的加热因数为每个加热元件提供校正因子。 将校正因子组合到相应的驱动脉冲以改变第一和第二周期，从而减少由于加热元件的加热因素的差异引起的点的变化。