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Transmitter and receiver configuration for inductive position encoder

An encoder and detector technology, applied in the field of measuring instruments, which can solve problems such as limitations, signal strength, compact size and high resolution, cost pollution, etc.

Pending Publication Date: 2021-09-24
MITUTOYO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, such systems may be limited in their ability to provide certain combinations of user-desired features, such as combinations of signal strength, compact size, high resolution, cost, robustness to misalignment and contamination, etc.

Method used

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  • Transmitter and receiver configuration for inductive position encoder
  • Transmitter and receiver configuration for inductive position encoder
  • Transmitter and receiver configuration for inductive position encoder

Examples

Experimental program
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Embodiment Construction

[0047] figure 1is an exploded perspective view of a hand tool type caliper 100 that may utilize an electronic position encoder including a known detector portion 167 and scale pattern 180, or a novel detector portion 167 and scale pattern 180 in accordance with the principles disclosed herein. In the illustrated embodiment, caliper 100 includes a scale member 102 having a longitudinal beam of generally rectangular cross-section including scale 170 and a slider assembly 120 . In various implementations, the scale 170 may extend along a measurement axis direction MA corresponding to the x-axis direction, and may include a signal modulation scale pattern 180 . A cover layer 172 of known type (eg, 100 μm thick) may cover the scale 170 . Jaws 108 and 110 near the first end of scale member 102 and movable jaws 116 and 118 on slider assembly 120 are used to measure the size of an object in a known manner. The slider assembly 120 may optionally include a depth rod 126 that is restr...

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PUM

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Abstract

An electronic position encoder includes a scale and detector. The detector includes a field generating coil (FGC) having elongated portions (EPs) bounding a generated field area (GFA) aligned with sensing windings, to provide position signals responsive to the scale interacting with the generated field. Sensing elements and EPs are fabricated in "front" layers of the detector. A transverse conductor portion (TCP) fabricated in a "rear" layer connects the EP of the FGC via feedthroughs. A shield region in a layer between the front and rear layers intercepts at least a majority of a projection of the TCP toward the front layers to eliminate undesirable signal effects. The FGC feedthroughs generate GFC feedthrough stray fields. Feedthrough pairs that connect sensing winding signals to rear layers of the detector are specially configured to mitigate undesirable signal effects that may otherwise result from their coupling to the GFC feedthrough stray fields.

Description

technical field [0001] The present disclosure relates to surveying instruments, and more particularly, to inductive position encoders that may be used in precision surveying instruments. Background technique [0002] Various encoder configurations may include various types of optical, capacitive, magnetic, inductive, motion and / or position transducers. These transducers use various geometries of transmitters and receivers in the readhead to measure motion between the readhead and scale. Magnetic and inductive transducers are relatively stable to contamination and therefore ideal in many applications. [0003] U.S. Patent No. 6,011,389 (the '389 patent) describes an induced current position transducer useful for high precision applications. U.S. Patent Nos. 5,973,494 ('494 patent) and 6,002,250 ('250 patent) describe incremental position sensing calipers and linear scales, including signal generation and processing circuits, U.S. Patent Nos. 5,886,519 ('519 patent), 5,841,2...

Claims

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Application Information

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IPC IPC(8): G01D5/14G01B7/00
CPCG01D5/14G01B7/003G01B3/205G01D5/2053
Inventor T.S.库克
Owner MITUTOYO CORP