INKJET PRINTHEAD HAVING MEMS SENSORS FOR DIRECTIONALLY HEATED INK EJECTION
    21.
    发明申请
    INKJET PRINTHEAD HAVING MEMS SENSORS FOR DIRECTIONALLY HEATED INK EJECTION 失效
    具有MEMS传感器的喷墨打印机用于直角加热墨水喷射

    公开(公告)号:US20080239009A1

    公开(公告)日:2008-10-02

    申请号:US12138375

    申请日:2008-06-12

    IPC分类号: B41J2/05

    摘要: An inkjet printhead is provided having nozzles, bubble forming chambers containing ejectable ink, generally planar heater elements each bonded on one side to an associated chamber so that the other side faces into the chamber, a MEMS fluid sensor having a MEMS sensing element for detecting the presence or otherwise of the ejectable ink in the chamber, and control circuitry for measuring the current passing through the sensing element during its heating. The heater elements receive heating pulses to form gas bubbles in the ejectable ink on the side facing into the chamber which cause ink ejection from the nozzle. Each chamber has a dielectric layer proximate the side of the heater element which has a thermal product less than 1495 Jm−2K−1s−1/2, the thermal product being (ρCk)1/2, where ρ is the density of the layer, C is specific heat of the layer and k is thermal conductivity of the layer.

    摘要翻译: 喷墨打印头设置有喷嘴,包含可喷射墨水的气泡形成室,大体上平面的加热器元件,其一侧分别结合到相关联的腔室,使得另一侧面向腔室; MEMS流体传感器,其具有MEMS感测元件,用于检测 在室中存在或以其他方式喷射墨,以及用于测量在其加热期间通过感测元件的电流的控制电路。 加热器元件接收加热脉冲以在面向腔室的一侧的可喷射墨水中形成气泡,这导致从喷嘴喷墨。 每个室具有靠近加热器元件侧面的电介质层,该电介质层的热产品小于1495μm至-1.0mm2 / /(L0),热产物为(rhoCk)1/2,其中rho是层的密度,C是层的比热,k是层的热导率。