Scale track configuration for absolute optical encoder

An encoder, absolute technology for precision measuring equipment

Active Publication Date: 2010-06-16
MITUTOYO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the prior art fails to teach a structure that can provide the specific combination of range-to-resolution ratio, high resolution, compact size, durability, and cost desired by users of absolute encoders

Method used

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  • Scale track configuration for absolute optical encoder
  • Scale track configuration for absolute optical encoder
  • Scale track configuration for absolute optical encoder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0025] image 3 is an exploded view schematically illustrating one embodiment of an absolute optical encoder structure 100 including various features in accordance with the present invention. Such as image 3 As shown, the encoder structure 100 includes: a scale element 110; a detector electronics 120, which is connected by power and signal connections to a signal generation and processing circuit 190; and an illumination system or section 160, which includes a A light source 130 of light or light of non-visible wavelengths, a lens 140 and an optional source grating 150 . Light source 130 may also be connected to signal generation and processing circuitry 190 via power and signal connections (not shown). Scale element 110 includes a back reference Figure 4 The absolute scale pattern 115 of the three scale track patterns of the incremental track pattern TINC, the first absolute track pattern TABS1 and the second absolute track pattern TABS2 will be explained in more detail....

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PUM

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Abstract

The invention relates to a scale track configuration for absolute optical encoder. An encoder configuration comprises an illumination portion, absolute scale pattern comprising absolute tracks, and a detector having a width dimension YDETABS. An absolute track pattern comprises geometrically congruent sub tracks, and the congruent sub tracks are arranged such that if one is translated by the width dimension YDETABS, then they will nominally coincide. The congruent sub tracks may be separated by a dimension YCENT that is less than YDETABS, and may each have a dimension YTOL, such that [YCENT+2(YTOL)] is greater than YDETABS. Thus, the detector may be narrower than the absolute track pattern, but because the detector edges are each nominally located over congruent sub tracks the detected signal is not sensitive to lateral misalignment of the detector within the pattern. These principles provide great freedom in configuring advantageous individual pattern features in the absolute track, even though the detector is narrower than the absolute track.

Description

technical field [0001] The present invention relates generally to precision measurement equipment, and more particularly to absolute optical encoders with multiple scale tracks that may rely on multiple optical sensing principles. Background technique [0002] Incremental position encoders utilize a scale structure that allows the displacement of the readhead relative to the scale to be determined by accumulating incremental units of displacement from a starting point along the scale. This type of encoder is suitable for specific applications, especially where line power is available. However, in certain applications where encoders and the like are used in low power consumption devices, it is more desirable to use absolute position encoders. The absolute position encoder provides a unique output signal or combination of signals at each position along the scale. Absolute position encoders do not require continuous accumulation of incremental displacements to identify positi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/347
CPCG01D5/34784
Inventor 米歇尔·M·米尔维驰卓赛弗·D·托比阿森
Owner MITUTOYO CORP
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