Bar-shaped displacement code, bar-shaped displacement code ruler and displacement detection device

Abstract

The invention discloses a bar-shaped displacement code, a bar-shaped displacement code ruler and a displacement detection device, the bar-shaped displacement code comprises a position bar, a number bar and a compensation bar, the position bar is parallel to the number bar, an angle [theta] is formed between the position bar and the compensation bar, and [theta] is more than 10 degrees and less than 90 degrees; the bar-shaped displacement code is manufactured on the ruler surface of the bar-shaped displacement code ruler, and the bar-shaped displacement code is perpendicular to the displacement detection direction; and the bar-shaped displacement code ruler and the linear array image sensor form a displacement detection device.

Description

technical field [0001] The application belongs to the field of length measurement, and relates to a bar displacement code, a bar displacement yardstick and a displacement detection device. Background technique [0002] Application No. 2020104453646 discloses a bar displacement code, a bar displacement yardstick and a displacement detection device. The scanning line of the linear array image sensor is perpendicular to the position bar, and the bar displacement yardstick and the linear array image sensor move in a relative straight line, ideally Under normal circumstances, within the entire displacement detection range, there is only one intersection point between the scanning line and the center line of each position bar, that is, the imaging center position of the position bar remains unchanged, but in reality, the scanning line of the line array image sensor and the bar displacement The movement direction of the code ruler is not completely parallel, which makes the scannin...

AI Technical Summary

Problems solved by technology

[0002] Application No. 2020104453646 discloses a bar displacement code, a bar displacement yardstick and a displacement detection device. The scanning line of the linear array image sensor is perpendicular to the position bar, and the bar displacement yardstick and the linear array image sensor move in a relative straight line, ideally Under normal circumstances, within the entire displacement detection range, there is only one intersection point between the scanning line and the center line of each position bar, that is, the imaging center position of the position bar remains unchanged, but in reality, the scanning line of the line array image sensor and the bar displacement The movement direction of the code ruler is not completely parallel, which makes the scanning line swing slightly on the position bar, and the position bar has burrs and distortions. If such burrs and distortions are not compensated, it will directly cause displacement detection errors. For high-precision displacement The detection device is unacceptable; the compensation of burr and distortion requires a corresponding compensation position mark, and this compensation position mark is unique within the displacement detection range, but the bar displacement code in the application number 2020104453646 scheme cannot mark the compensation position

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