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    • 62. 发明授权
    • System for detecting defective thermal printhead elements
    • 用于检测有缺陷的热敏打印头元件的系统
    • US4595935A
    • 1986-06-17
    • US640894
    • 1984-08-14
    • Ralf M. BrooksArvindkumar C. VyasBrian P. Connell
    • Ralf M. BrooksArvindkumar C. VyasBrian P. Connell
    • B41J2/375B41J2/35B41J2/365B41J7/96B41J29/00B41J29/46G01D15/10
    • B41J2/35B41J2/365B41J7/96
    • A system and method are disclosed for automatically detecting any defective elements in a linear array of thermal printhead elements of a thermal printer and for automatically correcting for at least one defective thermal printhead element. In a preferred embodiment of the invention an ON/OFF line from a microprocessor is turned OFF to turn off a voltage regulator, thereby preventing the thermal printhead elements from printing. With the voltage regulator OFF, a diode is forward biased to enable a voltage divider to be formed between a sensing resistor and any one of the thermal printhead elements that is activated at any given time. When a subsequent sense voltage (or resistance measurement) of an element exceeds the value of the initial reference sense voltage for that by a predetermined amount, that element is detected as a defective element. A software subroutine, in the microprocessor is then utilized to change the position of serial data bits carrying data to be printed such that the detected defective thermal element is not utilized during a normal printing operation.
    • 公开了一种用于自动检测热敏打印机的热打印头元件的线性阵列中的任何缺陷元件并且用于自动校正至少一个有缺陷的热打印头元件的系统和方法。 在本发明的优选实施例中,来自微处理器的ON / OFF线被关断以关闭电压调节器,从而防止热打印头元件的打印。 在电压调节器关闭的情况下,二极管被正向偏置,以便在感测电阻和任何一个在任何给定时间被激活的热敏打印头元件之间形成一个分压器。 当元件的后续感测电压(或电阻测量)超过预定量的初始参考感测电压的值时,该元件被检测为缺陷元件。 然后利用微处理器中的软件子程序改变携带要打印的数据的串行数据位的位置,使得在正常打印操作期间未使用检测到的有缺陷的热元件。