CN205280098U - Absolute formula rotary encoder's segmentation collection system - Google Patents
Absolute formula rotary encoder's segmentation collection system Download PDFInfo
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- CN205280098U CN205280098U CN201521073933.XU CN201521073933U CN205280098U CN 205280098 U CN205280098 U CN 205280098U CN 201521073933 U CN201521073933 U CN 201521073933U CN 205280098 U CN205280098 U CN 205280098U
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Abstract
The utility model discloses an absolute formula rotary encoder's segmentation collection system, including collimated light source module, rotary encoder and electro -optical imaging sensors module, the last absolute code way that is equipped with of rotary encoder, the beam that the collimated light source module was sent incides rotary encoder and upward reachs the electro -optical imaging sensors module through the transmission of absolute code way or after reflecting, light signal that the collection of electro -optical imaging sensors module was arrived converts the measurement signal of telecommunication into. The utility model discloses the segmentation of different multiples can be realized, absolute formula rotary encoder's resolution ratio is improved, low, simple structure of small, the development cost of this segmentation collection system and convenient operation moreover, but the wide application is in rotary encoder's measurement field.
Description
Technical field
This utility model relates to the fields of measurement of absolute rotary encoder, particularly relates to the segmentation acquisition system of a kind of absolute rotary encoder.
Background technology
Traditional optical rotary encoder measures system divided method mainly optical fine method, machinery close classification etc. Optical fine is through using the measure of a series of optics to make rotary encoder export the moire frange signal in multiple cycle when changing a pitch, thus reaching to improve the purpose of its Measurement Resolution. The conventional frequency multiplication etc. having optical imagery 2 frequency multiplication, optical diffraction 4 frequency multiplication, the high power frequency multiplication realized with balzed grating, thickness grating combination. But these methods are higher to optical system prescription, technique is more complicated, and light path adjustment is also pretty troublesome, and frequency can not be too high, and therefore the application of these methods is subject to certain restrictions. Machinery segmentation is then read the fractional part of grating pitch accurately by the method for fine motion element (fine motion drum or the fine motion chi) fine motion with scale value. Mainly segmentation multiple is bigger for its advantage, and the waveform of moire frange signal is not had very strict requirement, this method to major downside is that measurement is got up cumbersome, do not adapt to continuous print, measure dynamically, and use every time and be required for manual zero passage, therefore, the application of the method is also affected by certain restriction. Generally speaking, the equipment that current optical fine method adopts has the shortcomings such as loaded down with trivial details, the troublesome poeration of structure.
Utility model content
In order to solve above-mentioned technical problem, the purpose of this utility model is to provide the segmentation acquisition system of a kind of absolute rotary encoder.
This utility model solves its technical problem and be the technical scheme is that
A kind of segmentation acquisition system of absolute rotary encoder, including source of parallel light module, rotary encoder and electro-optical imaging sensors module, described rotary encoder is provided with absolute code channel, the parallel beam incident that described source of parallel light module sends arrives electro-optical imaging sensors module to rotary encoder and after absolute code channel transmission or reflection, described electro-optical imaging sensors module collection arrive optical signal and be converted to the measurement signal of telecommunication.
Further, described electro-optical imaging sensors module and absolute code channel are positioned in the plane being parallel to each other, and have an angle between electro-optical imaging sensors module and absolute code channel.
Further, described electro-optical imaging sensors module includes multiple evenly distributed photosensitive unit.
Further, described photosensitive unit adopts line array CCD, linear array CMOS or light cell.
Further, described rotary encoder adopts the round encoder of transmission-type, and the parallel beam incident that described source of parallel light module sends arrives electro-optical imaging sensors module to circle encoder and after absolute code channel transmission.
Further, described rotary encoder adopts reflective round encoder, and the collimated light beam that described source of parallel light module sends arrives electro-optical imaging sensors module by inciding round encoder place after an Amici prism light splitting after absolute code channel reflects.
The beneficial effects of the utility model are: the segmentation acquisition system of a kind of absolute rotary encoder of the present utility model, including source of parallel light module, rotary encoder and electro-optical imaging sensors module, described rotary encoder is provided with absolute code channel, the parallel beam incident that described source of parallel light module sends arrives electro-optical imaging sensors module to rotary encoder and after absolute code channel transmission or reflection, described electro-optical imaging sensors module collection arrive optical signal and be converted to the measurement signal of telecommunication. Native system can realize the segmentation of different multiples, improves the resolution of absolute rotary encoder, and this segmentation acquisition system volume is little, development cost is low, simple in construction and easy to operate.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is described in further detail.
Fig. 1 is the structural representation of the embodiment one of the segmentation acquisition system of a kind of absolute rotary encoder of the present utility model;
Fig. 2 is the Principle of sub-division schematic diagram of the absolute code channel in Fig. 1;
Fig. 3 is the unit striped position relationship schematic diagram with electro-optical imaging sensors module of the absolute code channel in Fig. 2;
Fig. 4 is the structural representation of the embodiment two of the segmentation acquisition system of a kind of absolute rotary encoder of the present utility model.
Detailed description of the invention
With reference to Fig. 1 and Fig. 4, this utility model provides the segmentation acquisition system of a kind of absolute rotary encoder, including source of parallel light module 1, rotary encoder 2 and electro-optical imaging sensors module 3, described rotary encoder 2 is provided with absolute code channel 21, the parallel beam incident that described source of parallel light module 1 sends arrives electro-optical imaging sensors module 3 to rotary encoder 2 and after absolute code channel 21 transmission or reflection, and described electro-optical imaging sensors module 3 gathers the optical signal arrived and is converted to the measurement signal of telecommunication.
It is further used as preferred embodiment, described electro-optical imaging sensors module 3 is positioned in the plane being parallel to each other with absolute code channel 21, and between electro-optical imaging sensors module 3 and absolute code channel 21, there is an angle theta, when projecting to same plane by electro-optical imaging sensors module 3 and absolute code channel 21, there is an angle theta, as shown in Figures 2 and 3.
Being further used as preferred embodiment, described electro-optical imaging sensors module 3 includes multiple evenly distributed photosensitive unit.
Being further used as preferred embodiment, described photosensitive unit adopts line array CCD, linear array CMOS or light cell.
Being further used as preferred embodiment, described rotary encoder 2 adopts the round encoder of transmission-type, and the parallel beam incident that described source of parallel light module 1 sends arrives electro-optical imaging sensors module 3 to circle encoder and after the transmission of absolute code channel 21.
It is further used as preferred embodiment, described rotary encoder 2 adopts reflective round encoder, and the collimated light beam that described source of parallel light module 1 sends arrives electro-optical imaging sensors module 3 by inciding round encoder place after Amici prism 4 light splitting after absolute code channel 21 reflects.
Below in conjunction with specific embodiment, the utility model is described in further detail.
Embodiment one
With reference to Fig. 1, a kind of segmentation acquisition system of absolute rotary encoder, including source of parallel light module 1, rotary encoder 2 and electro-optical imaging sensors module 3, described rotary encoder 2 is provided with absolute code channel 21, the parallel beam incident that described source of parallel light module 1 sends arrives electro-optical imaging sensors module 3 to rotary encoder 2 and after absolute code channel 21 transmission or reflection, and described electro-optical imaging sensors module 3 gathers the optical signal arrived and is converted to the measurement signal of telecommunication. Electro-optical imaging sensors module 3 is sent to a signal processor by measuring the measurement signal of telecommunication obtained, and this signal processor processes measuring the signal of telecommunication according to processing method of the prior art, can obtain the measured value of the absolute rotary encoder after segmentation. Preferably, this segmentation acquisition system includes a signal processor, for the measured value by obtaining absolute rotary encoder after measurement Electric signal processing.
In the present embodiment, electro-optical imaging sensors module 3 and absolute code channel 21 are positioned in the plane being parallel to each other, and between electro-optical imaging sensors module 3 and absolute code channel 21, there is an angle theta, when projecting to same plane by electro-optical imaging sensors module 3 and absolute code channel 21, there is an angle theta, as shown in Figures 2 and 3.
Electro-optical imaging sensors module 3 includes multiple evenly distributed photosensitive unit. Photosensitive unit adopts line array CCD, linear array CMOS or light cell. Rotary encoder 2 adopts the round encoder of transmission-type, and the parallel beam incident that source of parallel light module 1 sends arrives electro-optical imaging sensors module 3, imaging in electro-optical imaging sensors module 3 to circle encoder and after the transmission of absolute code channel 21.
In the present embodiment, absolute code channel 21 is the random printing opacity identical by multiple width or lighttight code element is constituted, the pseudo noise code being encoded to M sequence of absolute code channel 21.
This segmentation acquisition system, relative to prior art, have employed conversion in length and breadth and amplifies segmentation, it is possible to well improve the resolution of the absolute code channel 21 of absolute rotary encoder, the problem solving absolute position coarse reading. With reference to, shown in Fig. 2, there is an angle theta between electro-optical imaging sensors module 3 and absolute code channel 21, shown in Fig. 2, whenWhen angle is 90 ��, the length X of the minimum electro-optical imaging sensors module 3 corresponding for groove unit width W of absolute code channel 21 is the shortest, namely the photosensitive unit number formed is minimum, the centre distance assuming the photosensitive unit of electro-optical imaging sensors module 3 is B, then definitely the code element of code channel 21 namely a grating fringe will cover W/B photosensitive unit. As W=B, a grating fringe just covers a photosensitive unit. When �� angle is not 90 ��, shown in Fig. 3, Fig. 3 illustrates the placement relation between informal voucher stricture of vagina 211 and the electro-optical imaging sensors module 3 of the minimum groove unit width W of absolute code channel 21, the informal voucher stricture of vagina 211 of this minimum groove unit width W is also referred to as code element 211, and the relation of length L and the �� of the electro-optical imaging sensors module 3 in code element 211 is shown below:
L=W/sin��
Therefore, the ranging for of the amplification F of this segmentation acquisition system: W/B��F < N.
As it has been described above, when �� angle is 90 ��, amplification is 1; When �� angle is 0 ��, amplification is equal to total number of the photosensitive unit of electro-optical imaging sensors module 3. If, certain money adopts the number of the photosensitive unit of the electro-optical imaging sensors module 3 that model is ELIS-1024 of CMOS to be 1024, then the maximum amplification of this segmentation acquisition system is 1024. But generally �� angle is not 0 ��, so the amplification of system is less than total number of the photosensitive unit of electro-optical imaging sensors module 3.
In this utility model, absolute code channel 21 is different from the angle, �� that electro-optical imaging sensors module 3 is put mutually, amplification will change, angle, �� is more little, amplification F is more big, is shown below in conjunction with Fig. 2 and Fig. 3 functional relationship known between angle, �� and amplification F: F=W/ (Bsin ��).
Because the definitely pseudo noise code being encoded to M sequence of code channel 21, the decoding mechanism of the pseudo noise code of M sequence is to gather complete M stripe, it is M to ensure the complete striped number that electro-optical imaging sensors collects every time, then the required striped gathered is at least M+1 bar, guarantee realizes being correctly decoded, therefore, the minimum active length of electro-optical imaging sensors module 3 is: L2=(M+1) W/sin ��, and the effective photosensitive unit length L3 of the electro-optical imaging sensors module 3 of native system need to meet: L3 >=(M+1) W/sin ��.
Embodiment two
With reference to Fig. 4, the difference of the present embodiment and embodiment one is, rotary encoder 2 adopts reflective round encoder, the collimated light beam that described source of parallel light module 1 sends arrives electro-optical imaging sensors module 3, imaging in electro-optical imaging sensors module 3 by inciding round encoder place after Amici prism 4 light splitting after absolute code channel 21 reflects. The present embodiment can also realize the segmentation amplification effect same with embodiment one.
It is above of the present utility model preferably enforcement has been illustrated, but the invention is not limited to embodiment, those of ordinary skill in the art it may also be made that all equivalent variations or replacement under the premise without prejudice to this utility model spirit, and these equivalent modification or replacement are all contained in the application claim limited range.
Claims (6)
1. the segmentation acquisition system of an absolute rotary encoder, it is characterized in that, including source of parallel light module, rotary encoder and electro-optical imaging sensors module, described rotary encoder is provided with absolute code channel, the parallel beam incident that described source of parallel light module sends arrives electro-optical imaging sensors module to rotary encoder and after absolute code channel transmission or reflection, described electro-optical imaging sensors module collection arrive optical signal and be converted to the measurement signal of telecommunication.
2. the segmentation acquisition system of a kind of absolute rotary encoder according to claim 1, it is characterized in that, described electro-optical imaging sensors module and absolute code channel are positioned in the plane being parallel to each other, and have an angle between electro-optical imaging sensors module and absolute code channel.
3. the segmentation acquisition system of a kind of absolute rotary encoder according to claim 2, it is characterised in that described electro-optical imaging sensors module includes multiple evenly distributed photosensitive unit.
4. the segmentation acquisition system of a kind of absolute rotary encoder according to claim 3, it is characterised in that described photosensitive unit adopts line array CCD, linear array CMOS or light cell.
5. the segmentation acquisition system of a kind of absolute rotary encoder according to claim 1, it is characterized in that, described rotary encoder adopts the round encoder of transmission-type, and the parallel beam incident that described source of parallel light module sends arrives electro-optical imaging sensors module to circle encoder and after absolute code channel transmission.
6. the segmentation acquisition system of a kind of absolute rotary encoder according to claim 1, it is characterized in that, described rotary encoder adopts reflective round encoder, and the collimated light beam that described source of parallel light module sends arrives electro-optical imaging sensors module by inciding round encoder place after an Amici prism light splitting after absolute code channel reflects.
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| CN201521073933.XU CN205280098U (en) | 2015-12-18 | 2015-12-18 | Absolute formula rotary encoder's segmentation collection system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106706012A (en) * | 2016-12-20 | 2017-05-24 | 常州市新瑞得仪器有限公司 | Coding disc, photoelectric angle measurement encoder using same, and work method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106706012A (en) * | 2016-12-20 | 2017-05-24 | 常州市新瑞得仪器有限公司 | Coding disc, photoelectric angle measurement encoder using same, and work method thereof |
| CN106706012B (en) * | 2016-12-20 | 2019-03-26 | 常州市新瑞得仪器有限公司 | Coding disk, photoelectric measuring angular encoder and its working method using the coding disk |
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Granted publication date: 20160601 Termination date: 20191218 |