Quasi absolute type optical encoder
An optical encoder, quasi-absolute technology, applied in the direction of instruments, conversion sensor output, measuring devices, etc., can solve the problem of not being able to directly read the absolute position information of the rotating shaft, increasing the physical size of the encoder and the number of reading heads, and not Applicable to miniaturization occasions, etc.
Inactive Publication Date: 2012-11-21
SHANGHAI MICRO H MOTION AUTOMATION
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Problems solved by technology
The disadvantage is that it cannot directly read the absolute position information of the rotating shaft
But its disadvantage is that it increases the physical size of the encoder and the number of reading heads, which is not suitable for miniaturization occasions
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[0035] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.
[0036] Such as figure 1 As shown, the present invention discloses a quasi-absolute optical encoder, which includes a code disc mechanism, a reading mechanism 7 and a decoder system. The code disc mechanism sets the coded signal, and the reading mechanism 7 reads the coded signal on the code disc mechanism, and the input terminal circuit of the decoder system is connected to the output terminal of the reading mechanism 7, and the reading mechanism 7 outputs the coded signal to the decoder system for decoding The converter system receives and decodes the encoded signal.
[0037] Such as figure 1 and combine figure 2 As shown, the code wheel mechanism is provided with an incremental code track 1 and an index code track 2 arranged in parallel. There is a phase difference of 90° between the incremental code track 1 and the index code track 2...
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The invention discloses a quasi absolute type optical encoder which comprises a coded disc mechanism, a reading mechanism and a decoder system, wherein the coded disc mechanism is used for setting a coded signal; the reading mechanism is used for reading the coded signal on the coded disc mechanism; an input-end circuit of the decoder system is connected with an output end of the reading mechanism; an incremental code way and an index code way are arranged on the coded disc mechanism; the reading mechanism comprises a light source and a reading head; the light source gives out light which penetrates through the coded disc mechanism and is projected on the reading head; and an index region and a plurality of incremental regions, which correspond to the incremental code way and the index code way respectively, are arranged on the reading head. According to the quasi absolute type optical encoder, the encoder with two code ways is designed, one code way generates orthorhombic incremental singles, the other code way generates a pseudo-randomly coded signal, the pseudo-randomly coded signal is a pseudo-randomly arranged 'black and white' sequence, every continuous n bits of the sequence represent an absolute bit, and the adjoining n-bit sequences share (n-1)-bit sequences, so that the encoder can achieve the physical accuracy.
Description
technical field [0001] The invention relates to an optical measuring device, in particular to a quasi-absolute optical encoder for measuring angle or displacement. Background technique [0002] Currently the most widely used are incremental encoders and absolute encoders. [0003] Incremental photoelectric encoder outputs A and B two pulse signals with a mutual difference of 90° and the Z mark as the reference zero position, which can realize quadruple frequency measurement accuracy and fixed zero position signal. Its characteristics are: simple principle and structure, easy to implement; long average mechanical life, which can reach more than tens of thousands of hours; high resolution; strong anti-interference ability, long signal transmission distance, and high reliability. The disadvantage is that it cannot directly read the absolute position information of the rotating shaft. [0004] There are many engraved lines on the code disc of the absolute encoder, and each eng...
Claims
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Inventor 刘品宽
Owner SHANGHAI MICRO H MOTION AUTOMATION