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Grating displacement measuring device

A measuring device and grating displacement technology, which is applied in the field of optical detection, can solve the problems of high cost and long installation time, and achieve the effects of low cost, short installation time and improved measurement accuracy

Pending Publication Date: 2022-07-22
东莞市智赢智能装备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this technology requires two readheads, which is costly and time-consuming to install

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] like Figure 1 to Figure 5 As shown, a grating displacement measuring device provided by the present invention includes a grating ruler 1 and a reading head 2, and relative movement can occur between the grating ruler 1 and the reading head 2; it is characterized in that: the reading head 2 It includes a casing 21 , a cylindrical lens 22 is disposed in the middle of the casing 21 , a photodiode 23 is disposed on the rear side of the cylindrical lens 22 , and two or more light sources 24 are disposed around the photodiode 23 .

[0032] In this embodiment, by arranging more than two light sources 24 around the photodiode 23, the cost is lower compared to the traditional technical solution of multiple reading heads, and actually only one reading head needs to be installed, and the installation costs The time is short; and the photodiode 23 can compare the signals of the multiple light sources 24 during the measurement process, and then output the final signal, and the sign...

Embodiment 2

[0035] Example 2 is a further illustration of Example 1. like image 3 As shown, the grating ruler 1 is strip-shaped, and the grating ruler 1 is formed by splicing a plurality of linear gratings 11 in sequence, and the splicing gap 12 between two adjacent linear gratings 11 is smaller than that between two adjacent light sources 24 Pitch.

[0036] In the present embodiment, it is difficult to manufacture the entire linear grating 1 with a length of several meters. Therefore, a plurality of short linear gratings 11 can be manufactured first, and then the plurality of linear gratings 11 can be sequentially spliced ​​to form a longer grating. However, there is a splicing gap 12 between two adjacent linear gratings 11; if a reading head with more than two light sources 24 is used, when one of the light sources 24 illuminates the splicing gap 12, the rest of the light sources illuminate the grating ruler 1. At valid tick marks, the readhead will still function normally.

Embodiment 3

[0038] Example 3 is a further illustration of Example 1. like Figure 5 As shown, the grating ruler 1 is disc-shaped or annular; the distances between each of the light sources 24 and the center of the grating ruler 1 are equal.

[0039] In this embodiment, the distance between each light source 24 and the center of the grating ruler 1 is set to be equal, which is equivalent to arranging each light source 24 in a concentric circle that is concentric with the grating ruler, so as to ensure that each light source 24 can At the same time, an effective focus is generated on the disc-shaped or annular grating ruler 1; thus, the measurement accuracy is ensured.

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PUM

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Abstract

The invention relates to the technical field of optical detection, in particular to a grating displacement measuring device which comprises a grating ruler and a reading head, and the grating ruler and the reading head can move relatively. The reading head comprises a shell, a cylindrical lens is arranged in the middle of the shell, a photodiode is arranged on the rear side of the cylindrical lens, and more than two light sources are arranged around the photodiode. By arranging more than two light sources, the photodiode compares the signals of each light source and then outputs the final signal, so that the measurement precision is improved; besides, when a signal of a certain light source on the grating ruler is lost due to stains, scratches and splicing gaps, signals of other light sources are still effective, normal work of the grating displacement measuring device can be guaranteed, and the service life of the whole grating displacement measuring device is prolonged.

Description

technical field [0001] The invention relates to the technical field of optical detection, in particular to a grating displacement measuring device. Background technique [0002] Accurately acquiring the displacement information of instruments, machine tools, robots and other equipment is one of the keys to achieve precise measurement and processing; in the prior art, grating displacement measurement devices are often used for measurement. However, the existing grating displacement measuring device generally uses a single reading head to read the grating ruler, and the measurement error of the single reading head is large; when the grating ruler has defects such as stains and scratches, the signal of the single reading head will be lost, As a result, the entire grating displacement measuring device fails; and for linear grating rulers with a length of several meters, the overall manufacturing is difficult. Signal loss from single readhead. [0003] The patent document with ...

Claims

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Application Information

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IPC IPC(8): G01B11/02G01D11/28
CPCG01B11/02G01D11/28
Inventor 刘阳升王火华袁炜彬蒋江坤
Owner 东莞市智赢智能装备有限公司
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