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Design method for condensing element for improving illumination system of grating reading head

A grating reading head and light-gathering element technology, applied in the field of optics, can solve problems such as increasing the light-emitting area of ​​the light source, increasing the luminous flux of the light source, and failing to meet the collimation of the lighting system, and achieving high measurement accuracy, good collimation, and parallelism high effect

Inactive Publication Date: 2012-07-25
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

The large-sized light source increases the luminous flux of the light source, and also increases the light-emitting area of ​​the light source, which cannot meet the collimation requirements of the lighting system

Method used

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  • Design method for condensing element for improving illumination system of grating reading head
  • Design method for condensing element for improving illumination system of grating reading head
  • Design method for condensing element for improving illumination system of grating reading head

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Embodiment Construction

[0017] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments. The present invention is based on the principle of edge rays and the principle of etendue conservation: that is, the light from the edge of the light source should pass through the edge of the target element after passing through the optical element, and the radiant energy of the light during the propagation process remains unchanged. The condensing element makes the light source converge on the focal plane of the collimating lens, and the small-sized light source can achieve better collimation after passing through the collimating lens. The function of the collimating mirror is to transform the light beam with a relatively large divergence angle from the light source into a light beam with the smallest possible divergence angle and the best spot energy uniformity.

[0018] A design method for improving a light-gathering element of a grating rea...

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Abstract

A design method for a condensing element for improving an illumination system of a grating reading head belongs to the technical field of optics. According to the method, the size of light source is reduced, electric signals can be stably output, and the resolution and precision of a grating measuring device can be increased. The method includes the following steps: the position of the condensing element is first determined, i.e., the condensing element is between the light and a collimating lens, and is on the same optical axis as the illumination system of the grating reading head; according to the specific structure of the grating reading head and the mounting position of the condensing element, the size of the light passing through the condensing element is determined; and according to the actual size of the light source, the size of the light passing through the condensing element and the maximum incidence half-angle of the light capable of being received by the condensing element, the axial length and focal length of the condensing element are determined. The luminous flux of the light is increased, and the electric signals outputted by the illumination system of the grating reading head are strong; the collimation and parallelism of the emergent light passing through the condensing element are high; when the illumination system is used for measuring a grating scale, the measurement precision is high, and response speed is high.

Description

technical field [0001] The invention relates to the field of optical technology, in particular to a design method for improving a light-gathering element of a grating reading head illumination system. Background technique [0002] With the increasing demand for CNC machine tools in my country, the precision requirements of CNC machine tools are also getting higher and higher. It is inevitable to choose a high-accuracy grating scale for high-precision machine tools. The change of the electrical signal output by the photoelectric receiving element in the grating scale depends on the change of its received luminous flux. The greater the received luminous flux, the stronger the signal. The reading head is the core component of the grating measurement device, and its reasonable structural design and component selection can ensure accuracy and reduce costs. [0003] The current relatively simple lighting system uses an aspheric collimator for lighting, which has the advantages of...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/00G02B17/08G02B19/00
Inventor 卢振武刘华
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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