Photoelectric module of photoelectric encoder
A technology of photoelectric encoder and photoelectric module, which is applied in the direction of instruments, measuring instrument components, and conversion sensor output, etc., can solve the problems of limited response frequency and adapting to the environmental temperature range, poor contrast and signal quality, and difficulty in ensuring positioning accuracy. Achieve the effect of novel structure, improved performance, convenient installation and debugging
Inactive Publication Date: 2018-01-12
长春市万利通光电技术有限公司
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[0003] The invention provides a photoelectric module of a photoelectric encoder to solve the problems in the prior art that the positioning accuracy is difficult to guarantee, the contrast and signal quality are poor, the response frequency and the range of adaptable environmental temperature are limited, it is inconvenient to correct spherical aberration, and it is difficult to install and debug.
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[0015] Point light source, the traditional photoelectric encoder lighting uses light-emitting tubes, but the present invention uses unpackaged tube cores with a small light-emitting area, similar to point light sources, only point light sources can make the emission angle small and form parallel light illumination; aspheric collimation The objective lens and aspherical surface can be made into a large relative aperture, that is, large aperture, short focal length, and small spherical aberration, which is conducive to the formation of parallel light illumination, and meets the requirements of modularization due to its small size; array photocells, slits are made of Lines are composed of multiple groups of array lines with exactly the same lines. Take the a and b groups of array lines that only generate A and B two-phase signals as an example; the phase difference between array a and array b is 90°, such as figure 2 ; image 3 To receive the photocells of a and b groups of array...
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The invention relates to a photoelectric module of a photoelectric encoder, and belongs to the field of photoelectric technology. For a point light source, conventional photoelectric encoder illumination adopts a light-emitting tube. In the invention, an un-packaged die with small light-emitting area is employed and is similar to a point light source. Only the point light source can have the emission angle smaller and form parallel light illumination. For an aspheric collimating lens, an aspheric surface can be made in such a shape with relative large aperture, that is, a large aperture, shortfocal length, and small ball difference, which is beneficial for the formation of parallel light illumination. Small size meets the modular requirements. The structure is novel, and a slit in a photoelectric conversion system of the optoelectronic encoder is eliminated. A novel device and structure is used to optimize a lighting system. A signal processing circuit is fixed on a chip, the overalldevice is integrated, signal quality and performance are improved, the cost is reduced, and installation and commissioning are convenient.
Description
technical field [0001] The invention belongs to the field of photoelectric technology, in particular to a photoelectric module of a photoelectric encoder. Background technique [0002] The photoelectric conversion system is an important part of the photoelectric encoder, which consists of a light-emitting tube, a collimating objective lens, a slit, and a photocell. The slit is a fixed grating, and the code disc is a moving grating. The constants of the two gratings are the same, and they move to generate moiré fringes, which are received by photocells to generate electrical signals. The performance of the photoelectric conversion system determines the performance of the whole machine. Disadvantages: (1) The gap between the code wheel and the slit is determined by the diffraction of light, usually in the order of microns, which is difficult to guarantee. If the gap is small, it is easy to cause the code wheel and the slit to rub against each other, and the whole machine wil...
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IPC IPC(8): G01D11/28G01D5/244G01D5/347G01D5/38
Inventor 韩万富李凤春
Owner 长春市万利通光电技术有限公司