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    • 1. 发明授权
    • Absolute encoder using interpolation to obtain high resolution
    • 绝对编码器采用插补获得高分辨率
    • US5252825A
    • 1993-10-12
    • US728269
    • 1991-07-11
    • Motokatsu ImaiKoh OhnoTsuyoshi Matsumoto
    • Motokatsu ImaiKoh OhnoTsuyoshi Matsumoto
    • G01D5/249H03M1/14H03M1/26H03M1/30G01D5/34
    • H03M1/143H03M1/203H03M1/26H03M1/30H03M1/303
    • An absolute encoder device comprises a code plate having a 1-track type absolute pattern whose minimum reading unit length is .lambda., a first incremental pattern with a pitch .lambda., and a second incremental pattern with pitch 2.sup.-n .lambda.. The device also comprises a detector section, which is movable relative to the code plate, which includes a detector detecting the absolute pattern and obtaining an absolute pattern signal, a detector detecting a first incremental pattern and obtaining a first incremental signal, and a detector detecting a second incremental pattern and obtaining a second incremental pattern signal. A shorter cyclic incremental signal is generated from the first incremental signal by interpolating and the shorter cyclic signal is synchronized with the second incremental signal. The absolute pattern signal, the second incremental signal and the synchronized first incremental signal represent the relative positional relationship between the code plate and the detector section.
    • 绝对编码器装置包括具有最小读取单位长度为λ的1-轨道型绝对图案的代码板,具有间距λ的第一增量图案和具有间距2-nλ的第二增量图案。 该装置还包括可相对于码板移动的检测器部分,其包括检测绝对图案并获得绝对图案信号的检测器,检测第一增量图案并获得第一增量信号的检测器,以及检测器检测 第二增量模式并获得第二增量模式信号。 通过内插从第一增量信号产生较短的循环增量信号,并且较短的循环信号与第二增量信号同步。 绝对模式信号,第二增量信号和同步的第一增量信号表示代码板和检测器部分之间的相对位置关系。