An encoder grating disc and photoelectric encoder

Abstract

The invention provides an encoder grating disc and a photoelectric encoder, belongs to the technical field of photoelectric encoders, and aims to solve the problems that the cost of the traditional encoder grating disc and the cost of the traditional photoelectric encoder are high, and the position control of an output shaft is not accurate. The encoder grating disc comprises a disc body, wherein first grating holes are evenly and closely distributed in an outer ring of the disc body in the direction of circumference, a plurality of zero point reference positions are positioned in the inner ring which is adjacent to the outer ring in the disc body in the direction of circumference, and standard positions are formed by a plurality of the first grating holes corresponding to each zero point reference position; forward rotation reference positions are formed by a plurality of the first grating holes in one side of each standard position, backward rotation reference positions are formed by a plurality of the first grating holes in the other side of each standard position, the number of the first grating holes for forming the forward rotation reference positions is increased progressively in the clockwise direction, and the number of the first grating holes for forming the backward rotation reference positions is increased progressively in the anticlockwise direction. According to the invention, the encoder grating disc can accurately control the rotating position of the output shaft, and further lower the cost.

Description

technical field [0001] The invention belongs to the technical field of photoelectric encoders, and in particular relates to an encoder grating disc, an encoder grating disc and a photoelectric encoder. Background technique [0002] Photoelectric encoder is a sensor that converts the mechanical geometric displacement on the output shaft into pulse or digital quantity through photoelectric conversion, and is currently the most widely used sensor on numerical control equipment. A photoelectric encoder generally includes a grating disk and a photoelectric detection device, wherein the grating disk is in the shape of a disc, and several scribe lines are uniformly opened along the circumference of the disk; the photoelectric detection device is composed of electronic components such as light-emitting diodes. After the photoelectric encoder is installed on the output shaft, when the grating disc rotates with the output shaft at the same time, a number of pulse signals are output th...

AI Technical Summary

Problems solved by technology

[0003] However, due to the cumulative error of the zero point of the incremental encoder, the anti-interference is poor, the receiving device needs to be powered off for memory, and the zero or reference position should be found when starting up, resulting in the position of the output shaft cannot be accurately controlled, while the absolute encoder The encoder can solve these problems, so the absolute encoder is usually used instead of the incremental encoder to precisely control the position of the output shaft

However, the cost of the absolute encoder is very high at present, and when it is applied to the output shaft, the cost will also increase accordingly, reducing the economic efficiency

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