Optoelectronic converter of position-code type

FIELD: electronic engineering.

SUBSTANCE: device has coordinate scale having raster and code path of which the first one is represented as a chain of windows forming regular raster and the second one is represented as a chain of code windows, reading unit having illumination unit, analyzing raster mask, raster path photodetectors, and multi-element raster path photodetector. The raster path photodetectors, and multi-element raster path photodetector are connected to recording and analyzing unit, respectively. The reading unit has analyzing code mask being two window paths arranged so that succession period is a multiple of code step and window width is equal to the code step. The windows on the paths are shifted by a value equal to half code step.

EFFECT: eliminated ambiguity in reading coordinate code; high performance and accuracy.

3 cl, 6 dwg

 

The invention relates to measuring technique and can be used for measuring linear and angular displacements of the object.

The development of high technology makes the converters movements constantly growing requirements for their accuracy, reliability and ergonomics. Such requirements converters movements successfully satisfied in opto-electronic raster converters movements.

Known quasianalytic sensors linear and angular movements (see brochures. Annexes 1 and 2 to this application)that contains a bitmap scale, site reading, including the illuminator analyzing the mask and photodetectors. In these sensors is used odnogolosy code that allows the coordinate binding site read on the bitmap scale (coordinate scale), i.e. the sensors using a single reading of a one-dimensional window having a width equal to the step code.

In this regard, to identify the code provisions of the node is read after power up of the sensor is required to move the latter to a value that matches the bitness of your code.

Known transducer angle code (see the description of the invention to ed. St. USSR №1474843, CL H 03 M 1/ 24, publ. in 1989), in which the reduction of the required size specified what about the offset scitamineae signals is achieved by the application of a number of photosensors Windows the number and location of which is determined by the width of your code.

However, even in this case, the need for pre-move site read persists, although the amount of displacement decreases sharply. This is due to the effect of ambiguity code reading position of the node read-dimensional analyzing Windows of the mask.

The ambiguity of reading coordinate code may occur in the case of “critical” of the border layout code window relative to the center of one of the analyzing window, i.e. when it is not possible to reliably assign the signal of the photodetector is “0” or “1”. So to disambiguate reading coordinate code necessary to carry out additional offset analyzing mask, i.e. the offset of the node was read.

This makes mandatory the specified offset when determining the coordinate code after enabling the displacement transducer, which in some cases is invalid.

This disadvantage fixes the position sensor known from U.S. patent No. 5235181, CL G 01 D 5/34, publ. In 1993, and selected as a prototype of the claimed optical-electronic transducer position code.

This position sensor contains a coordinate scale raster and the code track and, the first of which is executed in a sequence of Windows that form a regular raster, and the second track is made in the form of a code sequence window, the node is read, including the illuminator, a projection lens, depicting the highlighted track code Windows on the photosensitive surface of the CCD (multi-element photodetector), analyzing raster mask forming optical raster mate with the raster path coordinate scale, and behind her respective photodetectors, and also contains recording and analyzing blocks. The CCD receiver in this position sensor generates a video signal representing a sequence of unipolar pulses, the envelope of which adequate distribution of light on its photosensitive surface. Thus, the video represents the current image of the area code paths in the coordinates of the line CCD.

Analysis of the video signal corresponding coordinate code allows to determine the position of the node is read at resolving the ambiguity of the read code information.

However, the disadvantages of the position sensor should be attributed to the increase in its size due to the use of the projection lens and the decrease in the accuracy of his work due to the remoteness of the CCD receiver from the coordinate scale. P the latter leads to the shift of the image of the code track on the CCD in the presence of possible angular displacement of the node is read relative to the coordinate scale, which can be due to technological errors carriage node reading, exercising its movement along the coordinate scale. The maximum value of the specified offsets provided for solving the problem of ambiguity reading limits the magnitude of the minimum step of the regular raster and, as a consequence, the potential accuracy of the position sensor.

The disadvantage of this sensor is also a reduction in its performance due to the need to sequentially output the signals of a large number of photodetector elements.

In the present invention solves the problem of disambiguation reading coordinate code with static initial position of the object being measured while increasing performance, reduce size and increase the potential precision opto-electronic transducer position code.

To achieve a technical result, in the optical-electronic transducer position code containing the coordinate scale with raster and code paths, the first of which is executed in a sequence of Windows that form a regular raster, and the second track is made in the form of a code sequence window, the node is read, including the illuminator, analyzing raster mask, made in the form of separate parts of a regular raster of the new Windows and optically coupled to a raster path coordinate scale, photodetectors bitmap tracks are for analyzing raster mask, and multi-element photodetector, and the photodetector raster paths and multi-element photodetector code paths connected respectively to recording and analyzing the blocks, the node read-supplied code analyzing mask representing two tracks window located with a repetition period, a multiple step code, and width of each window is equal to the step code, and window tracks the code analyzing mask mutually shifted by an amount equal to half of the step code, and the initial spatial phase analyzing raster mask and one of the tracks of the code analyzing mask combined overall width of the track code analyzing the mask is smaller than the height of the Windows code paths coordinate scale, with multi-element photodetector is located behind the code analyzing mask optically conjugate with the code track of the coordinate scale, and is designed as two separate lines of photodetector elements, each of which corresponds to a particular track of the code analyzing mask, the illuminator node reads executed in the form of LEDs installed in the focal plane of the condenser, and raster and code analyzing mask made in the form of a single detail.

New offer from the bretania is:

the code analyzing mask optically conjugate with the code track of the coordinate scale;

- execution of the code analyzing mask in the form of two tracks window located with a repetition period, a multiple step code, and width of each window is equal to the step code;

- run the Windows one track relative to the Windows of the other tracks with a shift equal to half of the step code;

- the combination of the initial spatial phase analyzing raster mask and one of the tracks of the code analyzing mask;

- total width of the tracks of the code analyzing mask is smaller than the height of the Windows code track of the coordinate scale;

- implementation of multi-element photodetector located behind the code analyzing mask, in the form of two separate lines of photodetector elements, the respective paths of the code analyzing mask.

The set of essential features enabled in the present invention, along with the elimination of the ambiguity of the read coordinate code with static initial position of the measurement object are:

to improve the performance of the Converter due to the decrease in the number of respondents photodetector elements with parallel poll;

- improve the potential accuracy of the transducer due to the fact that the code analyzing mask layout the wife in the immediate vicinity of the coordinate scale, that virtually eliminates the influence of the angular displacements of the carriage node read on the potential accuracy;

- reduce the size of the Converter due to the fact that the proposed design eliminates the use of the projection lens.

In the result, we can conclude that the proposed invention allows to obtain a technical result.

The invention is new, as in the prior art through the available sources of information not revealed analogues with similar set of features.

The invention is industrially applicable as it can be used in all applications that require high-precision position determination of the object.

The invention is illustrated by drawings, where

figure 1 shows the structural diagram of the optical-electronic transducer position code;

Figure 2 - node read in the context of In-In;

Figure 3 - axis scale and the node is read in the context of In-In;

Figure 4 is a fragment of the coordinate scale;

Figure 5 is a fragment of analyzing masks, including raster and code analyzing mask;

Figure 6 - analyzing mask and multi-element photodetector.

The inventive opto-electronic transducer position code (1, 2) contains a coordinate scale 1, the node read 2, consisting of optically conjugate SV is todiode 3, the condenser 4, the analyzing of the mask 5, photodetectors bitmap tracks 6 and multielement photodetector code track 7. The led 3 and the condenser 4 form illuminator. Analyzing mask 5 includes raster and code analyzing mask. Photodetectors bitmap tracks 6 and multielement photodetector code paths 7 are connected respectively with the recording unit 8 and the analyzing unit 9. Blocks 8 and 9 are connected.

The coordinate scale of 1 (figure 3, 4) has a raster 10 and code 11 tracks. Raster track 10 is made in a sequence of Windows that form a regular raster. The code track 11 made in the form of a code sequence window.

Analyzing mask 5 (figure 5) represents the raster analyzing a mask, made in the form of individual units 12 and 12'regular raster window, and the code analyzing mask, made in the form of two tracks 13 and 13'.

Window tracks 13 and 13’ of the code analyzing mask (figure 5) is arranged with a period L, a multiple step code L (figure 4), and width of each window is equal to L (step code). Window tracks 13 and 13' (figure 5) of the code analyzing mask mutually shifted by an amount equal to L/2 (half step code).

The initial spatial phase in units 12 and 12' raster analyzing masks are mutually shifted by an amount equal to π/2, L/4.

The initial spatial phase analyzing raster mask - link 12 and the track 13 of the code analyzing mask combined (figure 5).

Overall width “ b'” tracks 13 and 13' of the code analyzing mask (figure 5) is smaller than the height “b” of the Windows code track 11 of the coordinate scale of 1 (figure 4). Multi-element photodetector 7 code track (6) is designed as two separate lines 14 and 14' photodetecting elements, each of which corresponds to a specific track 13 and 13' (figure 5, 6) of the code analyzing mask, and each photodetector 6 and 6' raster paths corresponds to a link 12 and 12' regular raster Windows bitmap analyzing mask.

The substance of the work of the Converter is to reliably determine whether there is spatial phase code track 11 with respect to the zero phase of the code analyzing mask within value, equal to L/4.

If this condition is true, it ought to be taken in processing the signals of the photodetector elements corresponding to the line 13 of the code analyzing mask. Otherwise, the decoding must be signals of photodetector elements line 13'.

This information is generated by analyzing the link bitmap Windows 12 and 12' of the respective track regular raster 10 coordinate scale 1.

In these boxes caused the asters, with the same step, equal step regular raster 10, but shifted relative to each other by the value of the spatial phase equal to π/2, i.e. a quarter of the pitch. During this phase raster one of the Windows combined with the zero phase of the track 13 of the code analyzing mask.

When a static position of each transducer element comparison of the signals U0and U90taken respectively from the photodetectors bitmap tracks 6 and 6'connected with said Windows, allows you to take the decision to use one or the other of the tracks 13 and 13' of the code analyzing mask, that is to be read with a photodetector elements corresponding line 14 and 14' multi-element photodetector 7.

This comparison is performed by the registration unit 8. The result of the comparison is supplied to the analyzing unit 9, which carries out a survey of photodetector elements selected line 14 or 14’ and the formation of the code provisions of the node read 2 and its decoding.

The received information corresponds to the position of the node is read 2 relative to the coordinate scale 1 accurate to L/2.

Clarification coordinate information is carried out by processing the orthogonal signals of the photodetectors 6 and 6’ standard interpolator, which can be used, for example, chip iC-NG (the m the catalogue of the German company “iC-Haus". Annex 3 to this application), which is part of the registration unit 8.

Summarizing data coarse and fine counts and the formation results in the required format data analyzing unit 9, the output of which is the output of the Converter.

Thus, the present invention eliminates the ambiguity of reading coordinate code with static initial position of the object of measurement and at the same time to improve performance, reduce size and increase the potential accuracy of the Converter.

1. Opto-electronic transducer position code containing the coordinate scale with raster and code paths, the first of which is executed in a sequence of Windows that form a regular raster, and the second track is made in the form of a code sequence window, the node is read, including the illuminator, analyzing raster mask, made in the form of separate parts of a regular raster window, and optically coupled to a raster path coordinate scale, photodetectors bitmap tracks are for analyzing raster mask, and multi-element photodetector code track, and the photodetectors raster paths and multi-element photodetector code paths connected with the responsibility for registering and analyzing blocks, characterized in that the node is read-supplied code analyzing mask representing two tracks window located with a repetition period, a multiple step code, and width of each window is equal to the step code, and window tracks the code analyzing mask mutually shifted by an amount equal to half of the step code, and the initial spatial phase analyzing raster mask and one of the tracks of the code analyzing mask combined overall width of the tracks of the code analyzing mask is smaller than the height of the Windows code paths coordinate scale, with multi-element photodetector is located behind the code analyzing mask optically conjugate with the code track of the coordinate scale, and designed as two separate lines of photodetector elements, each of which corresponds to a particular track of the code analyzing mask.

2. Opto-electronic transducer position code according to claim 1, characterized in that the illuminator node reads executed in the form of LEDs installed in the focal plane of the condenser.

3. Opto-electronic transducer position code according to claim 1, characterized in that the raster and the code analyzing mask made in the form of a single detail.



 

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