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    Printhead integrated circuit with open actuator test
    6.
    发明授权
    Printhead integrated circuit with open actuator test 有权
    打开执行器测试的打印头集成电路

    公开(公告)号：US07874631B2

    公开(公告)日：2011-01-25

    申请号：US12611780

    申请日：2009-11-03

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

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

    IPC分类号： B41J29/38

    CPC分类号： B41J2/155 ,  B41J2/04543 ,  B41J2/04573 ,  B41J2/0458 ,  B41J2002/14491

    摘要： Provided is a printhead integrated circuit for an inkjet printer that has a nozzle and a corresponding actuator for ejecting ink through the nozzle. The Printhea IC also has drive circuitry for controlling the operation of the actuator. The drive circuitry has an open actuator test circuit comprising an open actuator test input, a column enable input and a row enable input, a drive transistor operatively linking said actuator to a power supply, a bleed transistor arranged in parallel with the actuator, a sense transistor operatively linking an output of the drive transistor and inputs of the actuator and bleed transistor to a sensing node. Actuating the actuator to eject ink by enabling the column and row enable inputs, deactivates the bleed transistor and activates the drive transistor to link the actuator to the power supply. Testing the actuator involves enabling the open actuator test input to activate the sense transistor, so that the actuator is short-circuited and the sense node is pulled high if the actuator is open-circuit.

    摘要翻译： 提供了一种用于喷墨打印机的打印头集成电路，其具有喷嘴和用于通过喷嘴喷射墨水的相应致动器。 Printhea IC还具有用于控制致动器操作的驱动电路。 所述驱动电路具有开放致动器测试电路，其包括开放致动器测试输入，列使能输入和行使能输入，可操作地将所述致动器连接到电源的驱动晶体管，与所述致动器平行布置的泄放晶体管， 晶体管可操作地将驱动晶体管的输出和致动器和放电晶体管的输入连接到感测节点。 启动执行器以通过启用列和行使能输入来喷射墨水，停用泄放晶体管并激活驱动晶体管以将致动器连接到电源。 对执行器进行测试包括启用致动器测试输入以激活检测晶体管，使得执行器短路，并且如果执行器是开路的，感测节点被拉高。

    Test circuitry for a printhead nozzle arrangement
    9.
    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。