Single ring absolute coded disk

Abstract

The invention provides a one-turn absolute encoding disc and pertains to the photoelectric inspection technology. The disc comprises transparent and non-transparent code stripes that are arranged in alternative way. The encoder taking the disc as core uses a linear array CCD as a receiving and dividing element, one CCD window contains 7-8 graduations. By an acquiring card, the signals output by CCD are sent into a computer, by two-valued processing, the number of 0 and 1 contained in each CCD window are obtained, an integral 7 numbers are combined together. The group of the current location is obtained by looking up the table of group code; program is written according to the angle-positioning arithmetic and by using advanced computer language VB. In this way, the value of the rotation angle can be obtained. Wherein, the table of group code is established based on the codes obtained.

Description

1. Technical field: [0001] The invention belongs to a single-turn absolute code disc related to the technical field of photoelectric detection. 2. Background technology: [0002] The code disc has been widely used as the core component of the photoelectric displacement testing equipment, especially the photoelectric shaft encoder. The code disc is a circular indexing element engraved with a number of uniformly distributed light-transmitting or opaque grid lines on the circular area of ​​​​the glass or metal surface. The circles are arranged in a certain order. A radial position has only a unique binary or other binary code, so different digital codes can be output at different positions, and the angular position code output after processing is a single-valued function of the rotation angle. The code disc has the advantages of fixed zero point, strong anti-interference ability, no need to re-zero when restarting after power failure, and no cumulative error. [0003] The num...

AI Technical Summary

Problems solved by technology

The quasi-absolute code wheel combines the characteristics of the incremental and absolute code wheels, which reduces the number of code channels for position coding, reduces the structural size of the code wheel, and then reduces the structural size of the encoder with it as the core. But at the beginning, the first position code must be obtained through a self-guiding process, and if a higher number of digits is to be obtained, more photodetectors must be placed, which increases the difficulty of the assembly process

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