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Position measuring encoder and operation method

An encoder, position information technology, applied in measuring devices, instruments, converting sensor output, etc., to solve problems such as incorrect readings

Active Publication Date: 2015-12-16
RENISHAW PLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, incorrect readings can be seen to occur even at very low error rates

Method used

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  • Position measuring encoder and operation method
  • Position measuring encoder and operation method
  • Position measuring encoder and operation method

Examples

Experimental program
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Embodiment Construction

[0056] refer to figure 1 . It shows an encoder device 2 comprising a readhead 4 , a scale 6 and a controller 7 . The readhead 4 and scale 6 are mounted to first and second objects (not shown) respectively, which are movable relative to each other. The speed of the relative movement can vary, but in the described embodiment the readhead 4 and scale 6 have a known maximum relative acceleration.

[0057] In the described embodiment, the scale 6 is a linear scale. However, it will be appreciated that scale 6 may be a non-linear scale, such as a rotary scale. Furthermore, the scale 6 enables measurements to be taken along only a single dimension. However, it will be understood that this need not be the case, eg a scale may allow measurements in two dimensions.

[0058] In the described embodiment, the scale 6 is an absolute scale and comprises a series of reflective 8 and non-reflective 10 lines arranged to encode unique positional data along the length of the scale. As will ...

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PUM

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Abstract

A method of operating a position encoder device comprising a scale and a readhead for reading the scale, the scale having features defining position information. The method includes: calculating extrapolated position information from at least one previous reading of the scale; comparing the extrapolated position with the position calculated from the scale reading to determine a difference therebetween; using the extrapolated position regardless of whether there is a difference information; and maintaining records of any discrepancies.

Description

technical field [0001] The invention relates to a position measuring encoder, in particular to a device for measuring the relative position between two objects. The invention also relates to a method of operating such a position measuring encoder. Background technique [0002] A position encoder is a device used to measure the relative position of two objects. Typically, the scale is attached to or formed on one of the objects and the scale reader is attached or formed on the other. The scale may have regularly spaced features (especially in the case of incremental scales) that define the measurement length, ie, the degrees of freedom in which the scale facilitates the measurement. Two-dimensional position encoders are also known, which have markings defining two generally orthogonal measuring lengths. [0003] The scale may be a linear scale for providing a measure of linear motion between two objects. Alternatively, the scale may be a rotating scale for providing a mea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D5/244
CPCG01D5/24461G01D5/34715G01D5/34792G01D5/2455G01D5/34794
Inventor 安德鲁·保罗·格里布尔
Owner RENISHAW PLC