Optical-electric encoder and subdivision method thereof
A photoelectric encoder and light source technology, applied in the field of encoders, can solve the problems of difficult production and high product cost, and achieve the effect of increasing the degree of subdivision and improving precision
Inactive Publication Date: 2015-06-03
徐海
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Problems solved by technology
With the increase of grating holes on the grating code disc, the interval between adjacent grating holes will become smaller and smaller, the higher the density of grating lines, the more difficult it is to manufacture, and the higher the cost of the product
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[0032] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, only parts related to the present invention are shown in the drawings but not all content.
[0033] Such as figure 1 As shown, the present invention provides a photoelectric encoder, including: a light source 1 , a lens 2 , a main grating 3 , an indicator grating 4 , a photosensitive component 5 and a measurement conversion circuit 6 . see figure 2 , the photosensitive component 5 includes 3 sets of identical photosensitive elements 7 (photosensitive element C), 8 (photosensitive element B), and 9 (photosensitive element A), and the 3 sets of photosensitive elements are placed in the center of the main grating and t...
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The invention relates to an optical-electric encoder and a subdivision method thereof. The optical-electric encoder comprises a light source, a lens, a main light optical grating, an indication optical grating, a light sensitive component and a measurement conversion circuit. The optical-electric encoder is characterized in that the light sensitive component comprises three sets of light sensitive components; the three sets of the light sensitive components are arranged in the direction of an extended optical grating line of a central connection line of the main optical grating and the indication optical grating; the phase distance between every two adjacent sets of the light sensitive components in the direction of the light grating line is (m+ / -1 / 3)L, so that the phase angle of the every two adjacent sets of the light sensitive components is of 1 / 3 period, m is an integer, and L is a moire fringe space. By adopting the technical scheme of the invention, the subdivision degree of the optical-electric encoder can be increased under the condition that the grating holes and grating plates do not need to be increased, and furthermore the precision of the optical-electric encoder is improved.
Description
technical field [0001] The invention belongs to the field of encoders, and in particular relates to a photoelectric encoder and a subdivision method thereof. Background technique [0002] A photoelectric encoder is a sensor that converts the mechanical geometric displacement on the rotating shaft into pulses or digital quantities through photoelectric conversion. This is the most widely used sensor at present. The photoelectric encoder is composed of a grating code disc and a photoelectric detection device. The grating code disc is to open several rectangular grating holes in equal parts on a circular plate with a certain diameter. Since the grating code disc is coaxial with the motor, when the motor rotates, the grating code disc and the motor rotate at the same speed, and the pulse output signal can be obtained through the detection of the photoelectric detection device composed of light-emitting diodes and other electronic components. The number of pulses output by the ...
Claims
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IPC IPC(8): G01D5/36
Inventor 徐海
Owner 徐海