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1. 发明授权

US06325481B1 Method and apparatus for pen temperature control in a thermal printer 失效
标题翻译：热敏打印机中笔温度控制的方法和装置
公开(公告)号：US06325481B1
公开(公告)日：2001-12-04
申请号：US09374544
申请日：1999-08-13
申请人： Greg P Pietz , Paul D. Bliley , Arezou Zarafshan , Carl E. Thomsen
发明人： Greg P Pietz , Paul D. Bliley , Arezou Zarafshan , Carl E. Thomsen
IPC分类号： B41J29393
CPC分类号： B41J2/195 , B41J2/36
摘要： A pen controller in a thermal printer generates a pulse width modulated (PWM) signal based on a reference voltage. The PWM signal is passed through a filter, resulting in a first voltage that varies with the duty cycle of the PWM signal. Additionally, a temperature sensing resistor on a pen of the printer generates a second voltage that varies with the temperature of the pen. A comparator is used to compare the first and second voltages to determine when the pen is at a proper temperature for printing. As the actual reference voltage in a printer may vary from its intended value due to variations in the fabrication process used to create the components of the printer, the printer is calibrated to account for such variations. The printer is calibrated by the pen controller changing the duty cycle of the PWM signal (thereby changing the first voltage) while the second voltage remains relatively constant. The comparator compares the first and second voltages and identifies when the duty cycle results in a first voltage that matches the second voltage. The pen controller can read, via an analog to digital converter channel, the value of the second voltage. Based on both the value of the second voltage (at the point where it which matches the first voltage), and the duty cycle at that point, the pen controller can calculate the actual reference voltage.
摘要翻译：热敏打印机中的笔控制器基于参考电压产生脉宽调制（PWM）信号。 PWM信号通过滤波器，导致第一电压随PWM信号的占空比而变化。此外，打印机笔上的温度感测电阻器产生随着笔的温度而变化的第二电压。比较器用于比较第一和第二电压以确定笔何时处于适当的温度以进行打印。由于打印机中的实际参考电压可能会因为用于创建打印机组件的制造过程的变化而与预期值不同，所以打印机被校准以考虑到这种变化。打印机由笔控制器校准，改变PWM信号的占空比（从而改变第一电压），而第二电压保持相对恒定。比较器比较第一和第二电压，并识别何时占空比导致与第二电压匹配的第一电压。笔控制器可以经由模数转换器通道读取第二电压的值。基于第二电压的值（与第一电压匹配的点）和该点的占空比，笔控制器可以计算实际的参考电压。

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