Single-code channel absolute position encoding method

Abstract

The invention relates to a method for single-mute absolute encoding, which comprises that: black strips and white strips are etched on a grating in an alternating way; a black strip and a white strip which are adjacent form a code bit; at least one code bit forms an identification code, at least one code bit forms a positional code, and all positional codes contain the same number of code bits; the number of the identification codes is the same as that of the positional codes and the identification codes and the positional codes are arranged in an alternating way; at least one code bit in each identification code is different of all code bits in each positional code; a code bit in each positional code forms a binary bit and is defined as 0 or 1 according to the width of the black strip of the code bit; the whole grating contains (m+p)*2 code bits at most, wherein m represents the number of the binary bits constituted the m bits of the positional codes and p represents the number of the code bits of the identification codes; an identification code and a positional code which are adjacent form a first code area; two adjacent first code areas form a secondary code area; and a bit sequence of a second positional code of each second code is the bit sequence after bitwise Not of a first positional code.

Description

technical field [0001] The invention relates to a single code track absolute position encoding method. Background technique [0002] In the current photoelectric displacement measurement, the incremental counting method combined with two gratings and the absolute position encoding method with one grating are usually used. [0003] The incremental counting method counts the pulse sequence generated when the two gratings move relative to each other, and uses the directional cumulative number to represent the displacement change. The principle of this method is simple, the grating process used is short, and the cost is low, but its disadvantages are: the reliability of the data is poor, once the cumulative counting error occurs, this error will be kept until the end of the measurement; In the event of a power outage, all recorded data will be lost immediately and cannot be recovered. [0004] The absolute position coding method engraves a code with a specific rule on a gratin...

AI Technical Summary

Problems solved by technology

The principle of this method is simple, the grating process used is short, and the cost is low, but its disadvantages are: the reliability of the data is poor, once the cumulative counting error occurs, this error will be kept until the end of the measurement; In the event of a power outage, all the counted data will be lost immediately and cannot be recovered

Multi-code channel coding not only has a long manufacturing process and high cost for the grating, but also has many corresponding photoelectric conversion elements and electronic devices, so the structure of the measuring device is complicated and the external size cannot be reduced.

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