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    • 71. 发明授权
    • Ink jet printing head and method for driving the same
    • 喷墨打印头及其驱动方法
    • US6149258A
    • 2000-11-21
    • US576438
    • 1995-12-21
    • Shigeru Kimura
    • Shigeru Kimura
    • B41J2/045B41J2/055B41J2/14B41J2/205B41J2/01
    • B41J2/04581B41J2/04588B41J2/04593B41J2/14274
    • An ink jet printing head includes a plurality of pressure chambers having a natural period T2 for propagation of a wave, and a plurality of piezoelectric elements having a natural period T1 for oscillation. T1 and T2 are selected such that T1=n.multidot.T2 or T2=n.multidot.T1 wherein n is a natural number. The driving voltage for the piezoelectric elements has a rise time T3 selected at T3=m.multidot.T2 wherein m is a natural number not lower than two if T1=2.multidot.T2, or selected at T3=m.multidot.T2 wherein m is a natural number if T2=n.multidot.T1. The rise time T3 may be selected at T3=n.multidot.T1 in the latter case. Both the rise time T3 and the voltage level V of the driving voltage are selected in a single printing head so that V/T3 is a constant for attaining a gray scale level printing. The rise time T3 thus selected provides stable ink droplets without satellite ink droplets degrading the printing quality.
    • 喷墨打印头包括具有用于波的传播的固有周期T2的多个压力室和具有用于振荡的自然周期T1的多个压电元件。 选择T1和T2使得T1 = nxT2或T2 = nxT1其中n是自然数。 用于压电元件的驱动电压具有在T3 = m×T2选择的上升时间T3,其中如果T1 = 2xT2,其中m是不小于2的自然数,或者在T3 = m×T2处选择,其中如果T2 = n×T1,则m是自然数。 在后一种情况下,可以在T3 = nxT1选择上升时间T3。 在单个打印头中选择上升时间T3和驱动电压的电压电平V,使得V / T3是用于获得灰度级打印的常数。 如此选择的上升时间T3提供稳定的墨滴,而卫星墨滴降低了打印质量。
    • 78. 发明授权
    • Optical distance measuring apparatus
    • 光学测距仪
    • US5204732A
    • 1993-04-20
    • US846811
    • 1992-03-06
    • Yukio OhmamyudaShigeru KimuraToru TanabeKazuhisa IwasakiTakao SetoHideki KitamuraKazuhiko SugimuraYasushi Senoo
    • Yukio OhmamyudaShigeru KimuraToru TanabeKazuhisa IwasakiTakao SetoHideki KitamuraKazuhiko SugimuraYasushi Senoo
    • G01S7/48G01S17/36
    • G01S17/36
    • An optical distance measuring apparatus is disclosed which is operable in accordance with a phase difference detecting process wherein a processing system including a central processing unit and a digital type mix-down circuit detects and calculates a phase difference between the electrical phase of a signal output from a light receiving portion in response to receipt of a reflected light beam and the electrical phase of a reference signal output from a reference oscillator so as to determine a distance between the apparatus and a object spaced at a distance to be measured with reference to the electrical phase of a local oscillation signal output from a local oscillator. A second circuit system of the processing system on the light receiving side includes a ladder resistance type attenuation circuit, a multiplexer, an veriable gain current amplifier, a wave shape correcting circuit and a signal amplitude detecting circuit. When the signal amplitude detecting circuit detects that the signal derived from the reflected light beam has an amplitude in excess of a predetermined value, the central processing unit controls the multiplexer so as to reduce a magnitude of the amplitude. In addition, an optical distance measuring apparatus operable in accordance with a time difference detecting process is disclosed.
    • 公开了一种光学距离测量装置,其可以根据相位差检测处理操作,其中包括中央处理单元和数字型混合降低电路的处理系统检测并计算输出的信号的电相位之间的相位差 响应于接收到反射光束的光接收部分和从参考振荡器输出的参考信号的电相,以便确定设备与被测量距离之间的物体之间的距离 从本地振荡器输出的本地振荡信号的相位。 光接收侧处理系统的第二电路系统包括梯形电阻型衰减电路,多路复用器,可验证增益电流放大器,波形校正电路和信号幅度检测电路。 当信号幅度检测电路检测到从反射光束导出的信号具有超过预定值的幅度时,中央处理单元控制多路复用器以减小振幅的大小。 此外,公开了一种根据时差检测处理可操作的光学距离测量装置。