公开(公告)号：US6271661B2

公开(公告)日：2001-08-07

申请号：US26870299

申请日：1999-03-16

Applicant: MITUTOYO CORP

Inventor： ANDERMO NILS INGVAR ,  MASRELIEZ KARL G ,  STEINKE KURT E

IPC: G01B7/00 ,  G01D5/245 ,  G01D5/249 ,  C08C19/06 ,  G01B7/14 ,  G01D5/20 ,  H03M1/22

CPC classification number: G01D5/2495

Abstract: An absolute position transducer system has two members movable relative to each other and includes a code track transducer and at least one fine wavelength transducer. The code track is arranged to form a sequential pattern of base-N code words, where N is greater than two (i.e., non-binary). Each sequential non-binary code word identifies an absolute position of one member with respect to the other at a first resolution. Alternatively, the code track is arranged to form a pseudo-random non-binary code word pattern. In this case, the transducer system compares a non-binary code word with a look-up table to determine an absolute position of one member with respect to the other at a first resolution. In order to generate a non-binary code word pattern, code track transducer employs different-sized flux disrupters, different-sized flux enhancers, or a combination of flux disrupters and enhancers.

Abstract translation: 绝对位置传感器系统具有可相对于彼此移动的两个构件，并且包括码轨换能器和至少一个精细波长换能器。 代码轨道被布置成形成基本N个码字的顺序模式，其中N大于2（即，非二进制）。 每个顺序非二进制码字以第一分辨率识别一个成员相对于另一个成员的绝对位置。 或者，代码轨道被布置成形成伪随机非二进制码字模式。 在这种情况下，换能器系统将非二进制代码字与查找表进行比较，以在第一分辨率下确定一个成员相对于另一个成员的绝对位置。 为了生成非二进制码字模式，代码轨道传感器采用不同大小的通量扰乱器，不同大小的通量增强器，或通量破坏器和增强器的组合。