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公开(公告)号:US5942900A
公开(公告)日:1999-08-24
申请号:US767922
申请日:1996-12-17
IPC分类号: B41J2/16 , B41J29/393 , G01R27/56
CPC分类号: B41J2/1646 , B41J2/14153 , B41J2/1601 , B41J2/1626 , B41J2/1632 , B41J2/1634 , B41J2/1635 , B41J29/393 , B41J2002/14387
摘要: Method and apparatus is described for detecting faults, such as cracks, in ink jet printhead heater chips using a resistor on the heater chip. The resistor is located adjacent to at least one edge of the heater chip. One method, for example, includes the steps of measuring the resistance of the resistor at a first temperature and comparing the measured electrical resistance to a theoretical calculated resistance. Another method, for example, includes the steps of measuring the resistance at a first temperature, heating the chip, and measuring the resistance at a second temperature. Faults are detected by comparing expected changes in resistance or temperature to measured changes.
摘要翻译: 描述了用于在加热器芯片上使用电阻器来检测喷墨打印头加热器芯片中的故障(例如裂纹)的方法和装置。 电阻器位于加热器芯片的至少一个边缘附近。 例如,一种方法包括以下步骤:在第一温度下测量电阻器的电阻,并将测量的电阻与理论计算的电阻进行比较。 例如,另一种方法包括以下步骤:测量第一温度下的电阻,加热芯片,以及测量第二温度下的电阻。 通过比较电阻或温度与测量变化的预期变化来检测故障。