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    • 73. 发明授权
    • Liquid jetting apparatus and electrostatic latent image developing apparatus
    • 液体喷射装置和静电潜像显影装置
    • US06269232B1
    • 2001-07-31
    • US09516365
    • 2000-03-01
    • Hiroshi FukumotoJyunichi AizawaYasuhiko Ozaki
    • Hiroshi FukumotoJyunichi AizawaYasuhiko Ozaki
    • G03G1510
    • G03G15/101B41J2/14008B41J2002/14322
    • A longitudinal wave propagates in ink toward an opening. The surface of the ink is positioned at the opening and is curved. A surface wave is excited from an end of the liquid surface owing to a restoring force caused by surface tension of the ink. Assuming that the wavelength of the surface wave is &lgr;c, the diameter of the opening is established to be not smaller than 2m &lgr;c. The surface wave is generated from an edge of the opening and rapidly decreases due to the longitudinal wave. The surface waves caused by the longitudinal wave do not interfere with each other at the opening provided that certain conditions are established. Therefore, no complicated interference wave occurs on the surface of the ink, and the surface of the ink vibrates with a large amplitude in the vicinity of the edge of the opening.
    • 纵向波在墨水中向开口传播。 墨水的表面位于开口处并弯曲。 由于由油墨的表面张力引起的恢复力,表面波从液面的端部被激发。 假设表面波的波长是lambdc,则开口的直径被确定为不小于2m lambdc。 表面波从开口的边缘产生,并且由于纵波而迅速减小。 如果建立某些条件,则由纵波引起的表面波在开口处不会相互干扰。 因此,在墨的表面上不会发生复杂的干涉波,并且墨的表面在开口边缘附近以大幅度振动。
    • 74. 发明授权
    • Ink jet printer
    • 喷墨打印机
    • US06257694B1
    • 2001-07-10
    • US09229683
    • 1999-01-13
    • Susumu TokumaruYoshitaka IwashitaHiroshi FukumotoHirohumi Matsuo
    • Susumu TokumaruYoshitaka IwashitaHiroshi FukumotoHirohumi Matsuo
    • B41J219
    • B41J2/19B41J2002/14354
    • An ink jet printer serves to solve a problem that ink is not normally discharged when bubbles are present in ink contained in a ink chamber of a print head. The ink jet printer performs normal discharge of ink by detecting bubbles contained in ink and carrying out an optimum head recovery operation, so that stable and high-quality printed matter can be obtained. According to a bubble detecting circuit and method employed in this ink jet printer, the impedance of the piezoelectric element of the head is first measured at given frequencies. Then, impedance versus frequency characteristics are obtained. Subsequently, it is determined, based on the impedance versus frequency characteristics, whether or not a bubble adheres to the piezoelectric element.
    • 喷墨打印机用于解决当打印头的墨水室中所含的墨水中存在气泡时油墨不能正常排出的问题。 喷墨打印机通过检测油墨中含有的气泡并进行最佳的头部恢复操作来执行油墨的正常排出,从而可以获得稳定且高质量的印刷品。 根据该喷墨打印机中使用的气泡检测电路和方法,首先在给定频率下测量头部的压电元件的阻抗。 然后,获得阻抗与频率特性。 随后,基于阻抗对频率特性确定气泡是否粘附到压电元件。