Single-code track absolute angle coded circle and encoder using the same

Abstract

The invention provides an absolute single-mute encode circle and an encoder of the circle, wherein, the encode circle is provided with a circle of encoding pattern which is divided into N areas, an area mark code strip is arranged between the areas for separation, each area comprises K-bit partition codes and m subdivision code strips, an area number of an area which is provided with a reference line is ensured according to the K-bit partition cod received by a linear image sensor, an angle rough value of a current position of the reference line of the linear image sensor is received, and an angle precise value of the reference line is ensured according to a center position of m subdivision code strips. The encode circle of the invention is of easy pattern, convenient making, and fast decoding speed, and a measuring accuracy of a sub-pixel can be received by using the encoder of the circle. The invention can be widely applied to geodetic instruments, such as electronic theodolite, total station, etc., and also can be applied to other angle measuring instruments and devices.

Description

technical field [0001] The invention relates to a single-track absolute angle encoding dial, which can be used on an absolute angle encoder, and the absolute angle encoder is applied to high-precision angle measuring instruments and devices, such as electronic theodolites and total stations and other geodetic instruments. Background technique [0002] Traditional optoelectronic angle measurement technology is divided into two types: incremental and absolute. Incremental angle measurement technology generally uses grating (or capacitive grating, magnetic grating, etc.) counting and subdivision methods. The measurement result is not only related to the measurement process, but also needs to establish a zero position every time the power is turned on. In use, especially the theodolite measurement brings inconvenience. If the instrument cannot restore the original measurement value after power off, it is necessary to establish a zero position and set the original measurement v...

AI Technical Summary

Problems solved by technology

In the prior art, coded graphics generally use pseudo-random code sequences or other random code sequences. The decoding method is to perform correlation calculations on the code sequences collected by the line image sensor and the entire random code sequence. Since the correlation calculation takes a lot of time, so It takes a long time to update the measurement data, so it is not suitable for occasions that focus on work efficiency. In addition, the coding patterns composed of various random codes are relatively complicated and difficult to manufacture

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