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    • 2. 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。
    • 5. 发明授权
    • Film-protected print head for an ink jet printer or the like
    • 用于喷墨打印机等的胶片保护打印头
    • US4734706A
    • 1988-03-29
    • US838240
    • 1986-03-10
    • Hue P. LeJames C. Oswald
    • Hue P. LeJames C. Oswald
    • B41J2/045B41J2/055B41J2/20G01D15/18
    • B41J2/20
    • A viscoelastic and ink-immiscible fluid is used to form a membrane over the ink orifice of a drop-on-demand, pressure pulse ink jet head. The membrane lies in a plane perpendicular to the direction of emission of ink drops, and provides a barrier between the ink orifice and the external atmosphere. Evaporation of the ink, or entry of contaminants including air into the ink, is thus inhibited. The elimination of evaporative clogging then permits the use of a smaller orifice. Wetting of the exterior surface of the ink jet head by the flow of ink through the ink orifice is also inhibited, thus making possible the production of more uniform ink drops that will emerge in a constant direction. The elastic property of the membrane permits the passage of an ink drop therethrough, followed by the closing up of the membrane. The viscous property of the membrane permits it to absorb any energy of a pressure pulse that is not consumed in ejecting an ink drop, thus inhibiting the occurrence of pressure oscillations that could cause either variations in the speed of ejected ink drops or the appearance of satellite ink droplets.
    • 使用粘弹性和油墨不混溶的流体在按需喷墨压力脉冲喷墨头的油墨孔上形成膜。 膜位于垂直于墨滴发射方向的平面上,并且在墨孔和外部气氛之间提供阻挡层。 因此,墨水的蒸发或包括空气在内的污染物进入墨水中。 消除蒸发堵塞然后允许使用较小的孔口。 通过油墨通过油墨孔流动喷墨头的外表面的润湿也被抑制,从而使得可能产生将在恒定方向上出现的更均匀的墨滴。 膜的弹性可使墨滴从其中通过,随后关闭膜。 膜的粘性使其能够吸收喷射墨滴时不消耗的压力脉冲的任何能量,从而抑制压力振荡的发生,这可能导致喷射墨滴速度的变化或卫星的出现 墨滴。