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    • 16. 发明授权
    • Ferroelectric relaxor actuator for an ink-jet print head
    • 用于喷墨打印头的铁电弛豫致动器
    • US5790156A
    • 1998-08-04
    • US844915
    • 1997-04-22
    • Jon C. MuttonHue P. LeQiming ZhangRonald L. AdamsL. Eric CrossThomas R. ShroutQiyue Chia Jiang
    • Jon C. MuttonHue P. LeQiming ZhangRonald L. AdamsL. Eric CrossThomas R. ShroutQiyue Chia Jiang
    • B41J2/045B41J2/14B41J2/16
    • B41J2/1623B41J2/04506B41J2/04581B41J2/04588B41J2/161B41J2/1625B41J2/1626B41J2/1631B41J2/1632B41J2/1643B41J2002/14387
    • A ferroelectric relaxor ceramic actuator material, such as lead magnesium niobate ("PMN"), has high electromechanical conversion efficiency, exhibits wide operating and manufacturing temperature ranges, does not require permanent polarization, and provides useful mechanical activity with reduced electrical drive voltages. A PMN actuator (66) may be bonded to an actuator diaphragm (64) with a high temperature soldering or brazing process. PMN material also has a diffuse Curie point range in which the dielectric constant (40), "d" coefficient (32), and dielectric loss (42) characteristics all rise to a peak and then fall as the temperature increases. A phase-change ink-jet print head (50) employs a PMN actuator that is compounded with lead titanate ("PT") to increase the temperature (T.sub.M) at which the peak dielectric constant occurs. The print head is operated at a temperature beyond the peak where the PMN:PT actuator "d" coefficient decreases as the temperature increases such that an increase in ink-jet drop ejection velocity caused by reduced ink viscosity is compensated for by a corresponding reduction in mechanical activity. The PMN:PT actuator thereby relaxes the temperature regulation and heat spreading requirements of the phase-change ink-jet print head.
    • 铁电弛豫陶瓷致动器材料,例如铌酸铅镁(“PMN”)具有高机电转换效率,表现出广泛的工作和制造温度范围,不需要永久极化,并且在降低的电驱动电压下提供有用的机械活动。 PMN致动器(66)可以通过高温焊接或钎焊工艺结合到致动器隔膜(64)。 PMN材料也具有扩散居里点范围,其中介电常数(40),“d”系数(32)和介电损耗(42)特性都全部升高到峰值,然后随温度升高而下降。 相变喷墨打印头(50)采用与钛酸铅(“PT”)复合的PMN致动器,以增加出现峰值介电常数的温度(TM)。 打印头的工作温度超过PMN:PT执行器“d”系数随着温度升高而降低的峰值温度,从而降低油墨粘度引起的喷墨滴落速度的增加可以通过相应的减小来补偿 机械活动。 因此,PMN:PT致动器松弛了相变喷墨打印头的温度调节和散热要求。