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    • 9. 发明授权
    • Ink-jet head driving circuit
    • 喷墨头驱动电路
    • US4714935A
    • 1987-12-22
    • US910818
    • 1986-09-23
    • Mitsuru YamamotoNobuaki SakuradaYoshitaka Watanabe
    • Mitsuru YamamotoNobuaki SakuradaYoshitaka Watanabe
    • B41J2/19B41J2/21G01D15/16
    • B41J2/19B41J2/2128
    • An ink-jet head driver comprises: a pressure chamber filled with a recording liquid; a piezo-electric element as electrical/mechanical transducing means for enlarging the capacity of the pressure chamber at a first stage and contracting it in a second stage into the state before enlargement, thereby emitting the recording liquid; and a device for adjusting the time interval between the first and second stages to adjust the emitting velocity. The capacity of the pressure chamber is changed due to charge and discharge by a charging/discharging circuit, and charge/discharge time constants of this circuit are selectively controlled by a control unit. According to this driver, mixture of air into recording liquid in the ink-jet head when the piezo-electric element is expanded is prevented, and a variable range of a dot diameter of the recording liquid droplet can be extended, thereby improving recording quality.
    • 喷墨头驱动器包括:填充有记录液体的压力室; 作为电/机械换能装置的压电元件,用于在第一阶段扩大压力室的容量并在第二阶段将其收缩到放大之前的状态,从而发射记录液体; 以及用于调整第一和第二级之间的时间间隔以调节发射速度的装置。 压力室的容量由于充放电电路的充放电而变化,该电路的充放电时间常数由控制单元选择性地控制。 根据该驱动器,防止了当压电元件膨胀时喷墨头中的空气与记录液体的混合,并且可以延长记录液滴的点直径的可变范围,从而提高记录质量。