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Absolute position encoder scale having layers in a stacked configuration

一种构造、标尺的技术，应用在绝对位置编码器标尺领域，能够解决限制、污染成本等问题

Inactive Publication Date: 2016-11-23
MITUTOYO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disclosed system limits its ability to provide the combination of compact size, high resolution, contamination cost, and robustness desired by users

Method used

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  • Absolute position encoder scale having layers in a stacked configuration
  • Absolute position encoder scale having layers in a stacked configuration
  • Absolute position encoder scale having layers in a stacked configuration

Examples

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Embodiment Construction

[0016] Throughout the drawings of this disclosure, it should be recognized that the z-axis dimension of one or more scale features may be exaggerated for clarity. The drawings can generally be considered in part representative and in part schematic. It will be understood based on this disclosure that signal separation and / or signal isolation achieved by the various scale layer structures disclosed herein may generally depend on skin depth effects. The skin depth effect in turn depends on both the scale layer material and the readhead operating frequency. By way of example, and not by way of limitation, in various embodiments, various layers may have a thickness (z-axis dimension) on the order of a fraction of the skin depth or multiple skin depths. The skin depth can be on the order of microns to several millimeters for practical materials and operating frequencies. One of ordinary skill in the art can determine the actual z-dimension of an actual device based on the various...

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Abstract

An absolute position encoder scale includes first and second layers in a stacked configuration. A read head moves relative to spatial modulation patterns of first (top) and second (lower) signal layers along a measuring axis, and a sensing portion produces one or more scale sensing fields to sense the signal layers. A higher frequency scale sensing field may provide a first limited sensing depth to sense position relative to the top signal layer pattern, and a lower frequency field may provide a second deeper sensing depth to sense position relative to the lower signal layer pattern. In some embodiments, an isolation layer between the first and second layers may include a spatial modulation pattern that complements the first layer pattern, to nullify its signal effects when sensing position relative to the second layer pattern using the second sensing depth.

Description

technical field [0001] The present invention relates to precision measuring instruments and to absolute position encoder scales that can be used in hand-held instruments such as calipers. Background technique [0002] A variety of optical, capacitive, magnetic and inductive transducers are available, as well as movement or position transducers. These transducers use transmitters and receivers of various geometries in the readhead to measure motion between the readhead and scale. Magnetic and inductive transducers are relatively robust against contamination, but not so perfectly. [0003] U.S. Patent No. 6,011,389 (the '389 patent) describes an inductive current position transducer that can be used in high-precision applications, and U.S. Patent Nos. 5,973,494 (the '494 patent) and 6,002,250 (the '250 patent) describe incremental position inductive calipers and linear Scales, including signal generation and processing circuitry, while U.S. Patent Nos. 5,886,519 ('519 patent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B3/18G01D5/347
CPCG01D5/2046G01D5/2455G01D5/249G01D5/34776G01B3/205G01D5/2066
Inventor T.S.库克
Owner MITUTOYO CORP
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