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    • 3. 发明授权
    • Absolute encoder
    • 绝对编码器
    • US5565864A
    • 1996-10-15
    • US299445
    • 1994-09-01
    • Kou OhnoTadashi HorikawaToru MoritaYuuji Yamazaki
    • Kou OhnoTadashi HorikawaToru MoritaYuuji Yamazaki
    • G01D5/249H03M1/28H03M1/22
    • G01D5/2492H03M1/282
    • An encoder includes a code plate, a detector, a transformer, and first and second calculators. The code plate is formed with an absolute pattern including a plurality of bit patterns, each bit pattern formed by a predetermined number of bits and representing one absolute position. The detector moves relatively with respect to the code plate, has a plurality of detecting elements arranged to be opposed to the predetermined number of bits, and reads the bit pattern from the absolute pattern to output a bit pattern signal representing the bit pattern. The transformer can transform only specific bit pattern signals corresponding to specific bit patterns out of a plurality of the bit pattern signals corresponding to the plurality of bit patterns, into the absolute positions. The first calculator calculates a relative, positional relation between the bit pattern corresponding to the bit pattern signal, read from the detector, and the specific bit pattern. The second calculator calculates information indicating a position of the code plate relative to the detector, based on the absolute position obtained by the transformer and the relative, positional relation obtained by the first calculator.
    • 编码器包括代码板,检测器,变压器以及第一和第二计算器。 码板形成有包括多个位模式的绝对模式,每个位模式由预定位数形成并表示一个绝对位置。 检测器相对于代码板移动,具有被布置为与预定数量的位相对的多个检测元件,并且从绝对图案读取位模式以输出表示位模式的位模式信号。 变压器只能将对应于多个位模式的多个位模式信号中的与特定位模式相对应的特定位模式信号转换成绝对位置。 第一计算器计算从检测器读取的与位模式信号相对应的位模式与特定位模式之间的相对位置关系。 第二计算器基于由变压器获得的绝对位置和由第一计算器获得的相对位置关系,计算指示代码板相对于检测器的位置的信息。