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    • 1. 发明授权
    • Method and apparatus for producing dot size modulated ink jet printing
    • 用于生产点尺寸调制喷墨印刷的方法和设备
    • US5495270A
    • 1996-02-27
    • US100504
    • 1993-07-30
    • Ronald F. BurrDavid A. TenceHue P. LeRonald L. AdamsJon C. Mutton
    • Ronald F. BurrDavid A. TenceHue P. LeRonald L. AdamsJon C. Mutton
    • B41J2/015B41J2/045B41J2/055B41J2/205B41J2/21G01D15/16
    • B41J2/04581B41J2/04588B41J2/04593B41J2/2128B41J2002/14306B41J2002/14419
    • An ink jet (10) apparatus and method provides high-resolution gray scale printing by providing multiple PZT drive waveforms (100, 110, 120), each having a spectral energy distribution that excites a different modal resonance of ink in an ink jet print head orifice (14). By selecting the particular drive waveform that concentrates spectral energy at frequencies associated with a desired oscillation mode and that suppresses energy at the other oscillation modes, an ink drop (170, 180, 190) is ejected that has a diameter proportional to a center excursion size of the selected meniscus surface oscillation mode. The center excursion size of high order oscillation modes is substantially smaller than the orifice diameter, thereby causing ejection of ink drops smaller than the orifice diameter. Conventional orifice manufacturing techniques may be used because a specific orifice diameter is not required. Jetting reliability and contaminant susceptibility are, thereby, improved by eliminating the need for an unconventionally small orifice. Changing a selected PZT drive waveform amplitude changes drop ejection velocity without changing drop volume. This invention, therefore, provides for selection of ejected ink drop volumes having substantially the same ejection velocity over a wide range of ejection repetition rates.
    • 喷墨(10)装置和方法通过提供多个PZT驱动波形(100,110,120)来提供高分辨率灰度级打印,每个PZT驱动波形具有频谱能量分布,其在喷墨打印头中激发墨的不同模态共振 孔口(14)。 通过选择将频谱能量集中在与期望振荡模式相关联的频率并且抑制其它振荡模式下的能量的特定驱动波形,喷射具有与中心偏移大小成比例的直径的墨滴(170,180,190) 的所选弯液面表面振荡模式。 高阶振荡模式的中心偏移大小基本上小于孔口直径,从而使墨滴喷射小于孔口直径。 可以使用传统的孔口制造技术,因为不需要特定的孔直径。 因此,通过消除对非常规小孔的需要,可以改善喷射可靠性和污染物敏感性。 更改所选的PZT驱动波形幅度会改变下降喷射速度,而不会改变下降音量。 因此,本发明提供了在广泛的喷射重复率范围内选择具有基本上相同喷射速度的喷射墨滴体积。
    • 3. 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。