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Illuminating system for absolute grating scale

A technology of lighting system and grating ruler, applied in the field of lighting system, can solve the problems of complex structure design of reading head, poor system stability, affecting measurement accuracy and corresponding speed, etc., and achieve the effects of light weight, fast response speed and simple structure

Inactive Publication Date: 2012-06-13
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problems in the prior art that the structure design of the reading head of the absolute grating ruler is complex and the system stability is poor, thereby affecting the measurement accuracy and corresponding speed, the invention provides an illumination system for the absolute grating ruler

Method used

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  • Illuminating system for absolute grating scale
  • Illuminating system for absolute grating scale
  • Illuminating system for absolute grating scale

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Embodiment Construction

[0011] Such as figure 1 Shown is a structural diagram of a lighting system used for absolute grating ruler measurement according to the present invention. The design method of the lighting system is as follows: firstly, the system structure is established in ZEMAX, the wavelength of the LED light source 5 is set to 670nm, and the aperture type is taken as an object The cone angle is 18°; the distance between the aperture stop 6 and the LED light source 5 is 4mm; the distance between the plane mirror 7 and the LED light source 5 is 10mm, and it is placed at an angle of 45° with the optical axis 9; The optical axis is placed vertically, 5mm away from the center of the plane reflector 7, the material of the lens is PMMA, and the front and rear surfaces are all aspheric; secondly, a self-defined optimization function is written using the ZEMAX macro language: the aperture is divided into n equal parts, according to The ray tracing algorithm in ZEMAX, from the unitized aperture coo...

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Abstract

Aiming to solve the problems that the structural design of a reading head of the absolute grating scale in the prior art is complex, and the system stability is poor, the invention discloses and provides an illuminating system for an absolute grating scale, which belongs to an illuminating system. The system includes an LED light source (5), an aperture stop (6), a planar reflecting mirror (7) and a collimating lens (8), wherein the LED light source (5) and the aperture stop (6) are coaxially arranged; the planar reflecting mirror (7) is arranged to form a 45 DEG included angle with an optical axis; and light emitted by the LED light source (5) passes through the aperture stop (6), and is reflected by the planar reflecting mirror (7), and the reflected light is incident on the collimating lens (8) and finally becomes emergent collimated light. The designed system has a simple structure, is small in volume and light in weight, and enables the emergent light rays to have excellent collimation and high parallelism.

Description

technical field [0001] The invention relates to an illumination system, in particular to an illumination system for an absolute grating ruler. Background technique [0002] In recent years, with the rapid development of the national economy, the demand for the output of CNC machine tools in my country has continued to increase. High-end CNC machine tools are one of the major special projects of the Ministry of Science and Technology. Breakthroughs in single-code absolute coding technology, photoelectric detector integration technology, and sine-cosine signal deviation correction and subdivision technologies improve the performance of domestic grating scales and meet the supporting requirements of high-end CNC machine tools. , to fill the domestic gap. In order to ensure the high machining accuracy of high-end CNC machine tools, it is necessary to correct the movement position error caused by the temperature rise of the screw and other transmission parts in the process of pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D11/28F21V13/00F21Y101/02
Inventor 刘华罗晓霞卢振武
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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