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Compact pseudorandom scale and read head for an inductive type absolute position encoder

An absolute position, encoder technology, used in electromagnetic measurement devices, conversion sensor outputs, instruments, etc.

Active Publication Date: 2019-04-30
MITUTOYO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, known techniques for implementing binary serial code tracks (e.g., pseudorandom code tracks) in absolute encoders are not suitable or ideal for all applications

Method used

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  • Compact pseudorandom scale and read head for an inductive type absolute position encoder
  • Compact pseudorandom scale and read head for an inductive type absolute position encoder
  • Compact pseudorandom scale and read head for an inductive type absolute position encoder

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Embodiment Construction

[0025] figure 1 with 2 is a diagram including part of a known inductive absolute encoder system 400 using a first known code sensing configuration. figure 1 with 2 The graph of is disclosed in previously incorporated US Patent No. 5,841,274 (the '274 patent). In various implementations, the sensing principles and signal processing taught in the '274 patent may be used in combination with the principles disclosed herein in accordance with the principles disclosed herein. Various aspects of absolute encoder system 400 are briefly outlined here. Additional associated details, explanations and teachings are available in the '274 patent.

[0026] The encoder system 400 includes a readhead 402 (which includes a detector including a field generator and a sensing element as described below) mounted adjacent to a scale 404 with the detector and scale facing each other along the measurement axis direction MA. sports. The scale part 404 extends along the measurement axis direction ...

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Abstract

An absolute position encoder comprises a scale and a detector overlaying the scale. The scale includes a periodic pattern of wavelength Wf and a code pattern having bit length Wcode. The detector includes a set of periodic pattern sensors and M sets of code pattern sensors. M is at least two. The configuration principles include: a) Wcode is larger than Wf and at most M*Wf, and b) the sets of codepattern sensors are located along the measuring axis at respective alignment positions configured such that as the code pattern moves in a single direction it moves by successive alignment intervalsthat are each at most Wf to align with successive alignment positions. Signal processing is provided to determine the absolute position based on the M respective sets of code detector signals and on spatially periodic signals arising in the periodic pattern sensing elements due to the periodic pattern.

Description

technical field [0001] The present invention relates generally to precision measuring instruments, and more particularly to absolute position encoders using the principle of inductive sensing. Background technique [0002] Various optical, capacitive, magnetic and inductive transducers, as well as movement or position transducers are available. These transducers use various geometric configurations of transmitters and receivers in the readhead to measure movement between the readhead and the scale. Inductive sensors are known to be one of the sensor types most immune to contamination from particles, oil, water and other fluids. US Patent No. 6,011,389 (the '389 patent), which is incorporated herein by reference in its entirety, describes an induced current position transducer that may be used in high precision applications. US Patent Nos. 5,973,494 and 6,002,250, each of which is incorporated herein by reference in its entirety, describe incremental position inductive cali...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B7/004
CPCG01B7/004G01D5/2053G01D5/2497
Inventor J.A.希契曼T.S.库克
Owner MITUTOYO CORP
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