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Assembling method of circular grating

An assembly method and circular grating technology, which are applied in installation, optics, optical components, etc., can solve the problems of limited image photo accuracy and difficulty in meeting the accuracy requirements of laser trackers

Active Publication Date: 2021-08-31
CHOTEST TECH INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, this method is limited by the accuracy of the image photo of the grating disc surface of the circular grating sensor, and it is difficult to meet the accuracy requirements of the laser tracker

Method used

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  • Assembling method of circular grating
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  • Assembling method of circular grating

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Embodiment Construction

[0027] All references cited herein are incorporated by reference in their entirety as if fully set forth. Unless defined otherwise, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. A general guide to many of the terms used in this application is provided to those skilled in the art. Those skilled in the art will recognize many methods and materials similar or equivalent to those described herein, which could be used in the practice of the present invention. Indeed, the present invention is in no way limited to the methods and materials described.

[0028] The method for assembling the circular grating used to reduce the eccentricity error involved in the present invention will be described below with reference to the accompanying drawings.

[0029] The invention relates to an assembly method of a circular grating for reducing eccentricity errors, in particular to an as...

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Abstract

The invention provides an assembling method of a circular grating. The assembling method comprises the steps: arranging the circular grating on a grating rotating shaft so that the circular grating can rotate relative to a base with the axis of the grating rotating shaft as the rotating center; capturing and presenting a grid line image with a grid line in the rotation process of the circular grating, and adjusting the relative position of the circular grating and a grating rotating shaft so as to enable the edge of one side of the grid line image to move to the dynamic range of the edge of the side; capturing grid line images of the circular grating at the at least two positions, converting the grid line images into a first electric signal and a second electric signal, obtaining an eccentric error of the circular grating based on the first electric signal and the second electric signal, and determining whether the eccentric error is smaller than a preset threshold; and a mounting step: if the eccentric error is smaller than a preset threshold value, fixing the relative position of the circular grating and the grating rotating shaft. In this case, the relative positions of the circular grating and the grating rotating shaft can be adjusted on the basis of the difference between the center of the circular grating and the axis of the grating rotating shaft.

Description

technical field [0001] The invention relates to an assembly method of a circular grating. Background technique [0002] The encoder made of circular gratings can accurately determine the angular position of the coordinates. Therefore, circular gratings are often used in laser trackers. Among the various error sources that affect the accuracy of the encoder, the eccentricity gap has a greater impact on the accuracy of the encoder, and the impact of the eccentricity gap on the accuracy of the encoder can be reduced through a suitable assembly method of the circular grating . [0003] In the prior art, the installation error of the circular grating is photographed by using the surface scribe lines of the circular grating, and the eccentricity of the grating disk is obtained based on the surface scribe lines of the circular grating. For example, CN201910278871.2 discloses a circular grating sensor angle measurement error correction method based on error source analysis, which ...

Claims

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Application Information

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IPC IPC(8): G02B7/00
CPCG02B7/00
Inventor 陈源廖学文张和君章智伟
Owner CHOTEST TECH INC
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