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    Test circuitry for a printhead nozzle arrangement
    82.
    发明授权
    Test circuitry for a printhead nozzle arrangement 有权
    打印头喷嘴装置的测试电路

    公开(公告)号：US07695091B2

    公开(公告)日：2010-04-13

    申请号：US12171294

    申请日：2008-07-11

    申请人： John Robert Sheahan ,  Mark Jackson Pulver ,  Brian Christopher Morahan ,  Alireza Moini ,  Timothy Peter Gillespie ,  Michael John Webb ,  Kia Silverbrook

    发明人： John Robert Sheahan ,  Mark Jackson Pulver ,  Brian Christopher Morahan ,  Alireza Moini ,  Timothy Peter Gillespie ,  Michael John Webb ,  Kia Silverbrook

    IPC分类号： B41J29/393

    CPC分类号： B41J2/04591 ,  B41J2/0451 ,  B41J2/04515 ,  B41J2/04541 ,  B41J2/04545 ,  B41J2/04551 ,  B41J2/04563 ,  B41J2/04573 ,  B41J2/0458 ,  B41J2/1404 ,  B41J2002/14403 ,  B41J2202/20

    摘要： Provided is test circuitry for testing a thermal actuator of a printhead nozzle arrangement of a printhead. The circuitry includes an open actuator test input, a column enable input and a row enable input. A drive transistor operatively links said thermal actuator to a power supply, and a bleed transistor is arranged in parallel with the thermal actuator. The circuitry also includes a sense transistor operatively linking an output of the drive transistor and inputs of the thermal actuator and bleed transistor to a sensing node, as well as a controller configured to deactivate the bleed and sense transistors and to activate the drive transistor when the column enable and row enable inputs are activated to link the thermal actuator to the power supply, and to activate the bleed and sense transistors when the open actuator test input is activated, so that the thermal actuator is short-circuited and the sense node is pulled high if the thermal actuator is open-circuit.

    摘要翻译： 提供了用于测试打印头的打印头喷嘴布置的热致动器的测试电路。 该电路包括一个打开的执行器测试输入，列使能输入和行使能输入。 驱动晶体管将所述热致动器可操作地连接到电源，并且放电晶体管与热致动器并联布置。 电路还包括感测晶体管，其操作地将驱动晶体管的输出和热致动器和放电晶体管的输入连接到感测节点，以及被配置为去激活放电和感测晶体管并且当激活晶体管激活时，激活驱动晶体管 列启用和行使能输入被激活以将热致动器链接到电源，并且当打开的致动器测试输入被激活时激活泄放和感测晶体管，使得热致动器短路并且感测节点被拉 如果热致动器是开路的，则为高。