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    • 3. 发明授权
    • Two-dimensional optical encoder with three gratings in each dimension
    • 具有三维光栅尺的二维光编码器
    • US5204524A
    • 1993-04-20
    • US848116
    • 1992-03-09
    • Souji IchikawaMikio SuzukiWataru IshibashiShingo Kuroki
    • Souji IchikawaMikio SuzukiWataru IshibashiShingo Kuroki
    • G01D5/36
    • G01D5/36
    • A first grating is formed on a main scale, and a second and third gratings on an index scale. The first grating generally assumes a cruciform shape, and consists of a grating having grating lines arranged in the X-direction and another grating having grating lines arranged in the Y-direction. The second grating is formed in a square central area of the index scale, and consists of two gratings having grating lines arranged in the X-direction and divided at the center and another two gratings having grating lines arranged in the Y-direction and divided at the center. The third grating consists of four gratings having grating lines arranged in the X-direction with different phases and another four gratings having grating lines arranged in the Y-direction with different phases. A light-emitting element and eight photodetectors that are arranged corresponding to the respective gratings of the third grating are fixed to a movable member on which the index scale is attached. Light emitted from the light-emitting element passes though the second grating, reflected by the first grating, passes through the third grating, and finally detected by the photodetectors. Alternatively, the first grating may consist of rectangular portions arranged in the X- and Y-direction in a matrix form.
    • 第一光栅形成在主刻度上,第二光栅和第三光栅以指标标度形成。 第一光栅通常呈十字形,由具有沿X方向排列的光栅线的光栅和具有沿Y方向排列的光栅线的另一光栅组成。 第二光栅形成在索引刻度的正方形中心区域中,由两个光栅组成,其格栅线沿X方向排列并分成中心,另外两个光栅具有沿Y方向布置的光栅线,并分为 中心。 第三光栅由具有不同相位的沿X方向布置的光栅线的四个光栅组成,另外四个光栅具有沿Y方向排列的具有不同相位的光栅线。 对应于第三光栅的各个光栅排列的发光元件和八个光电检测器被固定到附着有指标的可动部件上。 从发光元件发射的光通过第二光栅,被第一光栅反射,穿过第三光栅,最后由光电检测器检测。 或者,第一光栅可以由以矩阵形式布置在X方向和Y方向上的矩形部分组成。
    • 4. 发明授权
    • Method and apparatus for detecting origin of measurement
    • 用于检测测量原点的方法和装置
    • US06342697B1
    • 2002-01-29
    • US09398751
    • 1999-09-17
    • Ryo NagaiShingo Kuroki
    • Ryo NagaiShingo Kuroki
    • G01D534
    • H03M1/308
    • An interpolation circuit generates two-phase square wave signals PA and PB from two-phase sinusoidal wave outputs ØA and ØB supplied from a photoelectric encoder. A gate signal generator slices a primary origin signal ØZ supplied from the photoelectric encoder with a predetermined reference level VRef to generate a gate signal Z. A first counter begins to count position pulses generated from the two-phase square wave signals PA and PB when the gate signal Z becomes active. A count value of the first counter is divided by two when the gate signal Z becomes non-active and the divided value is preset into a second counter. The second counter counts the position pulses generated from the two-phase square wave signals PA and PB. A comparator feeds an output origin signal PZ when a count value of the second counter reaches a predetermined offset value N.
    • 内插电路从光电编码器提供的两相正弦波输出ØA和ØB生成两相方波信号PA和PB。 门信号发生器切割从光电编码器提供的具有预定参考电平VRef的原始信号ØZ以产生门信号Z.当第二计数器开始计数从两相方波信号PA和PB产生的位置脉冲时 门信号Z变为有效。 当门信号Z变为非有效时,将第一计数器的计数值除以2,并将分频值预设为第二计数器。 第二计数器对从两相方波信号PA和PB产生的位置脉冲进行计数。 当第二计数器的计数值达到预定的偏移值N时,比较器馈送输出原点信号PZ。
    • 5. 发明授权
    • Angular velocity sensor with displacement scale and sensor means
    • 具有位移尺度和传感器装置的角速度传感器
    • US5198663A
    • 1993-03-30
    • US854008
    • 1992-03-19
    • Souji IchikawaMikio SuzukiWataru IshibashiShingo KurokiToshiro Horikawa
    • Souji IchikawaMikio SuzukiWataru IshibashiShingo KurokiToshiro Horikawa
    • G01C19/56
    • G01C19/56
    • In one type of an angular velocity sensor, a constant vibration is applied in an X direction to one end of a vibrator which is fixed at another end and the vibrator vibrates in a Y direction perpendicular to the X direction by an action of Coriolis force caused by the angular velocity of the vibrator about the Z axis with an amplitude proportional to an angular velocity about a Z axis. An angular velocity sensor of this invention utilizes a photoelectric encoder for measurement of the vibration amplitude of the vibrator in the Y direction. The encoder includes a main scale mounted on the free end of the vibrator; an index scale mounted on a housing of the sensor to face the main scale; and a photoelectric element for sensing light reflected from the main scale and passing through the index scale. The angular velocity sensor utilizing the photoelectric encoder is less subject to influence of variation in the temperature in comparison with the conventional sensor utilizing piezoelectric elements and a higher precision can be attained.
    • 在一种类型的角速度传感器中,在X方向上施加恒定的振动,该振动器固定在另一端并且振动器通过科里奥利力的作用在垂直于X方向的Y方向上振动 通过围绕Z轴的振动器的角速度与Z轴的角速度成比例的振幅。 本发明的角速度传感器利用光电编码器来测量振动器在Y方向的振幅。 编码器包括安装在振动器的自由端上的主刻度; 安装在所述传感器的壳体上以与所述主秤相对的索引刻度; 以及光电元件,用于感测从主刻度尺反射并穿过指示标尺的光。 与使用压电元件的传统传感器相比,利用光电编码器的角速度传感器不受温度变化的影响,可以获得更高的精度。