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Absolute angle code and angle measuring device

A technology of measuring device and absolute angle, applied in the direction of measuring device, converting sensor output, instrument, etc., can solve the problem of small Moiré ripple sensitivity and absolute encodeable position.

Active Publication Date: 2014-07-16
DR JOHANNES HEIDENHAIN GMBH
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0006] Disadvantages of arranging the coding sequences in parallel are on the one hand the sensitivity to Moirée when scanning and the relatively small absolute codable position over a span of 360°

Method used

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  • Absolute angle code and angle measuring device
  • Absolute angle code and angle measuring device
  • Absolute angle code and angle measuring device

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Embodiment Construction

[0059] The cursor principle is used in the present invention. For absolute position measurement two consecutive coding sequences A, B are used, which have different lengths . At each position within the 360° measurement range, sub-positions consisting of several consecutive coded sequences A, B are now obtained The combination of constitutes a univocal absolute position POS. The advantage of this encoding is that the decoding device 3 only needs to decode a relatively short number of consecutive coded sequences A, B and the continuation of the cycle thereof, and then can pass a relatively simple method from the decoded coded sequences A, B The relationship defines a unique position POS over a span of 360°. If the decoding takes place by means of tables, only a few small tables are required. Much fewer table entries are required than absolute positions can be output.

[0060] exist figure 1 A first absolute angle encoder 1 and an angle measuring device constructed accor...

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Abstract

An absolute angle encoding (1) is constructed mono-orbitally. Parts of the first coding sequence (A) and parts of the second coding sequence (B) are arranged alternately in this track. These coding sequences (A, B) have different lengths, with the lengths of two coding sequences (A, B) preferably differing by 1. In order to determine the univocal absolute position (POS) within a week of the angle code (1), a decoding device (3) is provided which has a separate decoding device (3) for each of the two code sequences (A, B). Table (,) used for decoding. The absolute position is determined from the thus obtained sub-positions (, ) within the two coding sequences (A, B).

Description

Background technique [0001] Absolute angle measuring devices are increasingly used in many fields in order to determine the position of two objects moving relative to each other. An absolute angle measuring device has the advantage over purely incremental measuring systems that, in each relative position, correct position information can also be output immediately after an interruption of the energy supply. [0002] Here, the absolute position is represented by an angle code. It is particularly space-saving to arrange the positional information in a single coded track with symbols arranged successively in the measuring device. In this case, the symbols are arranged one behind the other in a pseudo-random distribution such that a specific number of symbols following one another each form a codeword which unambiguously defines the absolute position. A new codeword is already formed when the scanning device is shifted by a single symbol relative to the angular code, and a seque...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D5/249G01D5/347H03M1/28
CPCG01D5/2492H03M1/282
Inventor C.林格克
Owner DR JOHANNES HEIDENHAIN GMBH
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