US 8,476,580 B2Granted

Angle-measuring device and line of products with such angle-measuring devices

AssigneeDr. Johannes Heidenhain GmbH

InventorsElmar Mayer, Thomas Schürmann, Christoph Lingk

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Abstract

An angle-measuring device having a scanning device with which scanning of a closed serial first code and scanning of a closed serial second code is enabled, wherein a length of the closed serial second code is less than a length of the closed serial first code, and the closed serial first code and the closed serial second code have at least one common code section. The angle-measuring device includes a detector array for generating first and second sequences of code words of a predetermined scanning length upon scanning of the closed serial first code and second codes, respectively. The first sequence includes a first partial sequence and one common partial sequence, and wherein the common partial sequence is created upon scanning of the common code section. The second sequence includes a second partial sequence and the common partial sequence. The angle-measuring device further includes a decoding device designed for decoding the first and second sequences of code words, wherein the closed serial first and second codes as well as the predetermined scanning length are selected such that code words of the first and second sequences have a Hamming distance greater than 1.

Claims11

Dependent claims

An angle-measuring device comprising a scanning device with which scanning of a closed serial first code and scanning of a closed serial second code is enabled, wherein a length of said closed serial second code is less than a length of said closed serial first code, and said closed serial first code and said closed serial second code have at least one common code section, said angle-measuring device comprising:

a detector array for generating:
1) a first sequence of code words of a predetermined scanning length upon scanning of said closed serial first code, wherein said first sequence comprises a first partial sequence and one common partial sequence, and wherein said common partial sequence is created upon scanning of said common code section, and 2) a second sequence of code words of said predetermined scanning length upon scanning of said closed serial second code, wherein said second sequence comprises a second partial sequence and said common partial sequence, and wherein said common partial sequence is created upon scanning of said common code section;
and
a decoding device designed for decoding said first sequence of code words and said second sequence of code words, wherein said closed serial first code and said closed serial second code as well as said predetermined scanning length are selected such that code words of said first sequence and code words of said second sequence have a Hamming distance greater than 1.

1 more element

A line of angle-measuring devices, comprising:

a first angle-measuring device comprising:
a first code medium with a closed serial first code;
and
a scanning device that scans said first code medium, wherein said scanning device comprises:
a detector array for generating a first sequence of code words of a predetermined scanning length upon scanning of said closed serial first code;
and
a decoding device that decodes said first sequence of code words;
a second angle-measuring device comprising:
a second code medium with a closed serial second code;
and
said scanning device, wherein said scanning device scans said second code medium, wherein said scanning device generates a second sequence of code words having said predetermined scanning length upon scanning of said closed serial second code and wherein said decoding device decodes said second sequence of code words;
and
wherein a second length of said closed serial second code is less than a first length of said closed serial first code, and said closed serial first code and said closed serial second code comprise a common code section;
wherein said first sequence of code words comprises a first partial sequence and a common partial sequence, wherein said common partial sequence is created upon said scanning device scanning said common code section;
wherein said second sequence of code words comprises a second partial sequence and said common partial sequence;
and
wherein said closed serial first code, said closed serial second code and said predetermined scanning length are all selected such that code words of said first sequence of code words and code words of said second sequence of code words each have a Hamming distance greater than 1.

14 more elements

Dependencies are inferred from the claim text.