DE102017009331A1 - System with a preferably binary coding and a handset with read head for position determination - Google Patents

Abstract

System having a preferably binary coding and a mobile part, which is arranged relative to the coding relatively movable, in particular relatively movable in the direction of travel, and which has a read head, which has a number s of sensors, wherein the coding in the direction of the track consecutively arranged code elements , in particular in the direction of the line equidistantly arranged and / or regularly spaced code elements, the sensors are arranged parallel to the direction of the track behind one another, wherein by means of the sensors k formed in the direction of a line code elements codeword is detectable, where k is a natural number, which Number two exceeds, where k and the number s of the sensors have no common divisor, wherein the sensors cover the same length in the direction of the line as the code word.

Description

The invention relates to a system with a preferably binary coding and a handset with read head for position determination.

It is well known that in a movable handset based on a stationary coding position determination is executable.

From the US 8 878 526 B2 is known as the closest prior art, a magnetic encoder.

From the DE 102 44 234 A1 is a position measuring device known.

From the DE 199 39 643 A1 a device for determining the position between two relatively movable parts is known.

From the US 2012/0026321 A1 is a one-dimensional encoder known.

From the US 2012/0283986 A1 is a system for position determination known.

From the US 5,369,583 A For example, an optical torque sensor and a control system for vehicles is known.

The invention is therefore based on the object of developing a system, wherein the position determination is safely executable.

According to the invention the object is achieved in the system according to the features specified in claim 1 or 3.

• - wobei die Folge der detektierten Codewörter bei Bewegung des Mobilteils in Streckenrichtung einer Folge von Positionen des Mobilteils eineindeutig zugeordnet ist
• - und/oder wobei die Codierung aus einer in Streckenrichtung periodisch angeordneten Codefolge gebildet ist und wobei die Codefolge aus in Streckenrichtung hintereinander angeordneten Codeelementen gebildet ist und wobei die Folge der detektierten Codewörter bei Bewegung des Mobilteils in Streckenrichtung über die Codefolge hinweg jedes Codewort nur ein einziges Mal aufweist.

Important features of the invention in the system according to claim 1 having a preferably binary coding and a mobile part which is arranged to be relatively movable relative to the coding, in particular is arranged so as to be relatively movable in the direction of travel, and which has a reading head which has a number s of sensors, are that the code has in the direction of the line consecutively arranged code elements, in particular in the direction of the line equidistantly arranged and / or regularly spaced apart code elements,
wherein the sensors are arranged parallel to the path direction one behind the other,
wherein by means of the sensors a code word formed from k in the path direction successively arranged code elements is detectable, k being a natural number which exceeds the number two,
where k and the number s of sensors have no common divisor,
where k is less than s and s is less than or equal to 2 × k -1,
the sensors covering the same length as the codeword in the path direction,
especially

• - Wherein the sequence of the detected codewords is uniquely associated with movement of the handset in the direction of a train of positions of the handset
• - And / or wherein the coding is formed from a periodically arranged in the direction of the code sequence and wherein the code sequence is formed in the direction of the line sequentially arranged code elements and wherein the sequence of detected code words when moving the handset in the direction of the code sequence of time each code word only a single Times.

The advantage here is that the distribution of the sensors is designed such that when moving the handset no synchronous edge change of the signals generated by the sensors of the read head occur. Thus, only one sensor has an edge change during movement of the mobile part.

In addition, it is advantageous that a sufficient number of sensors are provided to clearly distinguish in all positions of the handset double sequences of ones and zeros of simply occurring ones or zeros, and to sample each occurring one or zero of the material measure in any case.

insbesondere so dass die Anzahl der Sensoren dem um ein verminderten Doppelten von k entspricht. Von Vorteil ist dabei, dass sehr wenige Sensoren zur Positionsbestimmung notwendig sind und trotzdem im Rahmen der Auflösung eine eindeutige Bestimmung der Position erreichbar ist.In an advantageous embodiment applies $$\text{s}=2\times \text{k}-\mathrm{1,}$$

in particular such that the number of sensors corresponds to a reduced double of k. The advantage here is that very few sensors for position determination are necessary and still within the resolution of a clear determination of the position can be achieved.

• - wobei die Folge der detektierten Codewörter bei Bewegung des Mobilteils in Streckenrichtung einer Folge von Positionen des Mobilteils eineindeutig zugeordnet ist
• - und/oder wobei die Codierung aus einer in Streckenrichtung periodisch angeordneten Codefolge gebildet ist und wobei die Codefolge aus in Streckenrichtung hintereinander angeordneten Codeelementen gebildet ist und wobei die Folge der detektierten Codewörter bei Bewegung des Mobilteils in Streckenrichtung über die Codefolge hinweg jedes Codewort nur ein einziges Mal aufweist.

Important features in the system according to claim 3 having a preferably binary coding and a mobile part, which is arranged to be relatively movable relative to the coding, is arranged in a relatively movable manner, in particular in the direction of travel, and has a reading head which has a number s of sensors,
wherein the coding has in the direction of the track successively arranged pairs of code elements, in particular in the direction of the line equidistantly arranged and / or regularly spaced pairs of code elements,
wherein the sensors are arranged parallel to the path direction one behind the other,
wherein by means of the sensors a code word formed from k in the path direction successively arranged pairs of code elements is detectable, k being a natural number which exceeds the number two,
where k is less than s and s is 4 × k + 1 or even 5 × k,
the sensors covering the same length as the codeword in the path direction,
especially

• - Wherein the sequence of the detected codewords is uniquely associated with movement of the handset in the direction of a train of positions of the handset
• - And / or wherein the coding is formed from a periodically arranged in the direction of the code sequence and wherein the code sequence is formed in the direction of the line sequentially arranged code elements and wherein the sequence of detected code words when moving the handset in the direction of the code sequence of time each code word only a single Times.

The advantage here is that the distribution of the sensors is designed such that when moving the handset no synchronous edge change of the signals generated by the sensors of the read head occur. Thus, only one sensor has an edge change during movement of the mobile part.

In addition, it is advantageous that a sufficient number of sensors are provided to clearly distinguish in all positions of the handset double sequences of ones and zeros of simply occurring ones or zeros, and to sample each occurring one or zero of the material measure in any case.

Another advantage is that the sensor density is so high that a quasi-analog sampling of the coding can be achieved.

In an advantageous embodiment, only two types of pairs are provided,
wherein a pair of first type has two code elements arranged one behind the other in the direction of the line, in particular of equal length,
in particular wherein the code element arranged at the front in the direction of the track represents the state HIGH, in particular 1, and the code element arranged at the rear in the track direction is the state LOW, in particular 0,
wherein a pair of second sort is different from the pair of first sort but also has two code elements which are arranged one behind the other in the direction of the line, in particular the same length,
in particular, wherein the forwardly arranged in the direction of the track code element state LOW, in particular 0, and the rear in the direction of the code element arranged the state HIGH, in particular 1. The advantage here is that a secure detection of the position is achievable and an almost analog scan is achievable , Errors in the determination are thus prevented.

In an advantageous embodiment, the coding is formed from a code sequence arranged periodically in the path direction, the code sequence being formed from code elements arranged one after the other in the path direction,
in particular, wherein the centers of gravity or centers of the code elements in the direction of the track are regularly spaced from each other. The advantage here is that the code elements represent a material measure in a simple manner.

In an advantageous embodiment, the sensors are arranged equidistantly in the path direction. The advantage here is that a high accuracy in the position determination can be achieved.

In an advantageous embodiment, the centers of gravity or centers of the sensors are arranged regularly spaced from each other parallel to the direction of the line. The advantage here is that a high accuracy in the position determination can be achieved.

In an advantageous embodiment, an evaluation unit is connected to the sensors, which determines the codeword from the sensor signals generated by the sensors, that is to say from a signal word resulting therefrom. The advantage here is that a secure determination of the code word and thus the codeword associated position is executable.

In an advantageous embodiment, the code sequence is a de Brujin sequence. The advantage here is that each position is uniquely associated with a codeword.

In an advantageous embodiment, the code words that can be formed from the code sequence uniquely identify at each position the code elements forming the code word. The advantage here is that the position is uniquely determined by the one-to-one assignment by determining the code word. Position always means the area determined by the resolution in the direction of the line in position detection.

In an advantageous embodiment, the code sequence is embodied such that the codeword detected by means of the sensors of the read head is uniquely associated with the position of the read head in the path direction, in particular in the region of the code sequence,
where a finite resolution exists,
in particular wherein the resolution corresponds to the quotient of the codeword length and the sensor number. The advantage here is that the position in the context of the resolution is uniquely determined in a simple manner.

In an advantageous embodiment, the position in each case in the direction of the line has an extent which corresponds to the extent of a respective code element in the direction of the line or which corresponds to the resolution,
In particular, therefore, the position is in each case an area and / or is subject to tolerance. The advantage here is that the position in the context of the execution of the read head, in particular taking into account the number of sensors, simple and one-to-one determinable.

In an advantageous embodiment, the number of bits of the particular code word is smaller than the number of code elements of the code sequence, ie in particular the period of the coding .. The advantage here is that in each code sequence several code words are providable and thus a secure determination of the position on a link segment having the length of the code string.

In an advantageous embodiment, the sensors of the reading head scan the code words completely. The advantage here is that a secure determination is achievable.

In an advantageous embodiment, more sensors are distributed over the length of a code word than the code word has code elements. The advantage here is that an accurate determination and a one-to-one assignment to the position can be achieved.

In an advantageous refinement, a further code coding complementary to coding is provided parallel to the coding,
wherein further sensors for detecting the further coding are provided on the reading head or on the mobile part. The advantage here is that a further improved security in determining the position is achievable.

In an advantageous embodiment, the sensors and / or the further sensors are magnetically biased differential Hall sensors designed to scan the code elements of the coding or the code elements of the further coding. The advantage here is that a simple and secure determination is achievable.

In an advantageous embodiment, the material measure is made of printed or stamped material. The advantage here is that a simple production is possible.

Further advantages emerge from the subclaims. The invention is not limited to the combination of features of the claims. For the skilled person, further meaningful combination options of claims and / or individual claim features and / or features of the description and / or figures, in particular from the task and / or the task posing by comparison with the prior art arise.

• In der 1 ist nur zur Erläuterung des Hintergrundes der Erfindung ein System, insbesondere Vorrichtung, zur Erfassung einer Streckenposition, insbesondere Linearposition, schematisch dargestellt, wobei ein zu einer linearen sequentiellen Codierung als erste Spur relativ bewegbarer Lesekopf 11 vorhanden ist.
• In der 2 ist der Lesekopf 11 in einer anderen Position als bei 1 gezeigt.
• In der 3 ist nur zur Erläuterung des Hintergrundes der Erfindung ein System, insbesondere Vorrichtung, mit einer weiteren Spur dargestellt.
• In der 4 ist zu dem in 3 gezeigten System, insbesondere Vorrichtung, ein zusätzlicher Lesekopf 11 vorgesehen.
• In der 5 ist ein erfindungsgemäßes System, insbesondere Vorrichtung, gezeigt, bei welchem der Lesekopf mit engerer Anordnung der Sensoren 12 ausgeführt ist.
• In der 6 ist ein anderes erfindungsgemäßes System, insbesondere Vorrichtung, gezeigt, bei welchem die Codierung im Vergleich zu den Codierungen der vorherigen Systeme Manchester-codiert ist und die Anzahl der Sensoren 12 im Lesekopf das Vierfache der Anzahl der Codeelemente 10 im Codewort 13 der vorherigen Systeme überschreitet.
• In der 7 ist bei einem weiteren anderen erfindungsgemäßen System, insbesondere Vorrichtung, im Vergleich zur 6 eine noch höhere Anzahl von Sensoren 12 im Lesekopf 11 vorhanden.
• In der 8 ist die Bestimmung der Auflösung des Systems, insbesondere der Vorrichtung, nach 6 schematisch skizziert.
• In der 9 ist die Bestimmung der Auflösung für ein weiteres anderes erfindungsgemäßes System, insbesondere Vorrichtung, schematisch dargestellt, dessen Codierung grayabgetastet wird.

The invention will now be explained in more detail with reference to figures:

• In the 1 For the purpose of illustrating the background of the invention, a system, in particular a device, for detecting a distance position, in particular a linear position, is shown schematically, wherein a read head 11 that is relatively movable to a linear sequential coding as the first track is present.
• In the 2 the read head 11 is in a different position than at 1 shown.
• In the 3 For the purpose of explanation of the background of the invention, a system, in particular a device, is shown with a further track.
• In the 4 is to the in 3 shown system, in particular device, an additional read head 11 is provided.
• In the 5 is a system according to the invention, in particular device shown, in which the read head with a narrower arrangement of the sensors 12 is executed.
• In the 6 FIG. 12 shows another system according to the invention, in particular a device, in which the coding is Manchester coded in comparison with the codings of the previous systems and the number of sensors 12 in the reading head exceeds four times the number of code elements 10 in the codeword 13 of the previous systems.
• In the 7 is in a further other system according to the invention, in particular device, compared to 6 an even higher number of sensors 12 in the read head 11 is present.
• In the 8th is the determination of the resolution of the system, in particular the device, after 6 sketched schematically.
• In the 9 the determination of the resolution is schematically illustrated for a further system according to the invention, in particular a device whose encoding is gray-sampled.

As in 1 is shown, a handset is movable along the route, on which a reading head 11 is attached.

The route is either straight or curved, in particular linear or rotary, formed.

Stationary sequential encoding is attached, which can be labeled as a track and represents a material measure.

The coding is in this case composed of code elements which are arranged one behind the other in the direction of the line, in each case have the same extent in the direction of the line and have at least one binary state, ie one of at least two states. The code elements 10 thus represent a material measure.

The reading head 11 has sensors 12 for the detection of the material measure. In addition, the reading head 11 moved relative to the coding relative movement parallel to the track direction or against the track direction. The signals generated by the sensors are fed to an evaluation unit, which determines a codeword from the signal word supplied to it in this way.

The coding is a periodic sequence of code elements 10 assembled, which are preferably spaced from each other regularly.

The at the reading head 11 arranged sensors 12 are arranged one behind the other in the direction of the track and regularly spaced from each other. The distance between the centroids or midpoints of each of two nearest adjacent sensors 12 is the same as the spacing of the centers or centroids of each of two nearest adjacent code elements 10 the coding, so track.

The number of sensors 12 in the embodiment according to 1 exactly three. The number of sensors 12 thus defines the length of the signal word and also of the code word to be detected 13 , In the example shown only to illustrate the background of the invention 1 Thus, both the signal word and the code word is exactly three bits. So applies at 1 : s = 3 and k = 3.

The coding is carried out periodically and therefore has a period length for this purpose 15 , So a period of the code sequence, so coding on. In the case of a closed route, the route length preferably equals the period length 15 or an integer multiple of the period length 15 ,

The codeword 13 in the execution after 1 has a length of three bits.

The binary code sequence of the coding is chosen such that the code word is one-to-one the linear relative position of the read head 11 assigned. In ideal execution is thus the code word 13 in each position unique, if as position only those discrete positions are used, where a respective sensor 12 is aligned in flight to a respective code element 10 , Thus, the position is immediately recognizable even after a power failure.

At appropriate relative linear positions, the signal word is similar to the codeword, if not a respective sensor 12 is located in flight to transitional transition of two code elements 10 , In practical implementation, however, the problem arises that a respective sensor 12 may be located in unsuitable linear positions in flight to the transition region of two code elements 10 , In this case, the signal is from the sensor 12 not safe to assign.

This situation of an intermediate position of the reading head 11 is in 2 illustrated.

For improvement, a system, in particular a device, according to 3 designed as a two-lane system with fine-resolution reference track. Here is a release unit 30 with sensors (sin, cos) whose centers or centroids have a smaller distance than the code elements 10 , In this case, the coding of the reference track has a period length which is twice as large as the distance of the centroids or midpoints of the code elements 10 ,

Thus it can be seen if the sensors 12 of the read head lie in alignment with a flank of the coding of the first track. Thus, when the sensors (sin, cos) have the values provided for measuring a position, the sensors become 12 evaluated and thus determines the position. Thus, therefore, only evaluated when the sensors 12 do not stand on a code edge. However, if the sensors 12 On a flank stand and thus unauthorized values of the sensors (sin, cos) are generated, no position can be determined.

Therefore, in the system after 4 an additional reading head 40 provided, an offset in the direction of the line to the other read head 11 having. Thus, a complete and absolute measuring system can be produced. As in 4 Thus, eight sensors (K0, K1, K2, S0, S1, S2, cos, sin) are necessary.

As in 5 shown, there is a system with also complete and absolute measuring feature provided. There is only one track, so coding, provided whose code elements 10 are again arranged equidistant in the direction of the track to each other. Thus, therefore, the focal points or centers of the next adjacent code elements 10 each spaced evenly and regularly. The distance between two adjacent code elements 10 be denoted by A.

The reading head in turn has sensors 12 although they are also equally spaced from each other, however, the distance B of two respectively next adjacent sensors is smaller than A. In the example, five sensors, which three consecutive code elements 10 Thus, 5 × B = 3 × A. The signal word thus has five bits and the code word to be detected and / or three bits to be determined. So applies at 5 : s = 5 and k = 3.

With relative movement of the read head 11 compared to the coding is in the embodiment after 5 thus successively detected as a signal word: 0, 1, 3, 2, 6, 4, 12, 13, 9, 25, 27, 19, 23, 7, 15, 31, 30, 28, 24, 16.

When moving, only one bit changes at a time. Thus, a clear position detection is possible. There are no synchronous edge changes.

However, other embodiments can be used advantageously as long as the number s of the sensors 12 is greater than or equal to the doubled by one of a natural integer k. At the same time, the sensors cover up 12 the code word to be detected, in 5 So three code elements 10 that is three bits. It must therefore at least apply: $$\text{s}=2\times \text{k}-1$$

The number of code elements contained in the codeword 10 thus has no common divisor with the number of sensors 12 of the reading head 11 , which are arranged in the direction of the track within the length of a codeword.

As in 6 Alternatively, another system according to the invention can be embodied.

The coding is changed in comparison to the previous figures. The difference to the previous coding lies in the fact that each code element 10 the previous encoding two new code elements 60 be assigned. This assignment corresponds to the idea of Manchester coding. In the example, this is a code element 10 with the value 0 two new code elements 60 , namely assigned 0 1. It also becomes a code element 10 with the value 1, two new code elements 60 , namely 10 assigned.

The reading head 11 has thirteen sensors 12 on, which are arranged in the direction of the track within the length of a codeword, that is, the length of three previous code elements 10 having. This corresponds to the length of six new code elements 60 ,

In further embodiments, the code word has k bits, k thus previous code elements 10 where k is preferably greater than two. At least 4 × k + 1 sensors are in the reading head 12 arranged. The spacing of the sensors 12 is executed accordingly tight. The 4 × k + 1 sensors 12 extend so in the direction of the track on the of the 2 × k new code elements 60 covered route length.

By means of these sensors 12 is thus the signal word detected in the respective position, ie the tuple of the signals of the 4 × k + 1 sensors 12 , uniquely assigned to the position, with movement of the reading head 11 only one sensor changes state along the path direction.

In 7 another system according to the invention is shown in which even 5 × k sensors 12 associated with the codeword. With such a large amount of sensors, a further improved position detection can be carried out.

To determine the resolution a in the position detection are in 8th different positions of the reading head 11 shown. As in 8th Thus, the resolution a results in the position detection as $$\text{a}=\left(1-\text{4}\times \text{k /}\left(4\times \text{k}+1\right)\right)/2^{\wedge }\text{k}\text{,}$$

For k = 3, so the embodiment according to 6 results in a = 1/104, with only thirteen sensors 12 necessary.

For the embodiment according to 5 On the other hand, a resolution of $$\text{a}=\text{k /}\left(2\times \text{k}-1\right)/2^{\wedge }\text{k}$$

wobei n eine natürliche Zahl ist, insbesondere größer als Zwei ist.Even if you instead of every sensor 12 of the reading head 11 of the 5 a number s = 2 ^ n sensors 12 would apply, a resolution a would be achievable according to: $$\text{a}=\text{k /}\left(\left(2\times \text{k}-1\right)\times 2^{\wedge }\text{n}\right)/2^{\wedge }\text{k}\text{,}$$

where n is a natural number, in particular greater than two.

For k = 3 and n = 3 you get 1/106, but then 40 sensors 12 necessary.

The determination of the respective position of the handset is always possible only in the context of the resolution. The position of the mobile part is therefore always to be understood as an area extending in the direction of the line, the area being extended in the direction of the line according to the resolution.

The sensors detect the state of a respective code element 10 either magnetic, optical or inductive. In particular, each sensor can also be realized by a group or even only a single pixel of a camera, which records an image of the material measure. As a material measure also ferromagnetic material is used, which is deepened to code the binary state or not deepened.

LIST OF REFERENCE NUMBERS

10

CodeElement

11

read head

12

sensor

13

code word

14

bookmark

15

Period of the code sequence

30

Release unit with sensors

40

another reading head

50

signal word

60

new code elements

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• US 8878526 B2 [0003]
• DE 10244234 A1 [0004]
• DE 19939643 A1 [0005]
• US 2012/0026321 A1 [0006]
• US 2012/0283986 A1 [0007]
• US 5369583 A [0008]

Claims (15)

System having a preferably binary coding and a mobile part, which is arranged relative to the coding relatively movable, in particular relatively movable in the direction of travel, and which has a read head having a number s of sensors, wherein the coding in the direction of the track has successively arranged code elements , in particular in the direction of the line equidistantly arranged and / or regularly spaced code elements, the sensors are arranged parallel to the direction of the track behind the other, characterized in that by means of the sensors from k in the direction of successively arranged code elements formed codeword is detectable, where k is a natural number which exceeds the number two, where k and the number s of the sensors do not have a common divisor, where k is less than s and s is less than or equal to 2 × k -1, with the same lengthwise direction of the sensors cover such as the codeword, in particular - wherein the sequence of detected codewords is uniquely associated with movement of the mobile in the path direction of a sequence of positions of the mobile part - and / or wherein the coding is formed of a sequence of lines periodically arranged code sequence and wherein the code sequence of Track direction is formed successively arranged code elements and wherein the sequence of the detected codewords on movement of the handset in the direction of the track over the code sequence of each codeword has only a single time. System after Claim 1 , characterized in that $$\text{s}=2\times \text{k}-1$$

applies, in particular so that the number of sensors to a reduced by double of k corresponds. System having a preferably binary coding and a mobile part, which is arranged relatively movably relative to the coding, is arranged in a relatively movable manner, in particular in the direction of travel, and which has a reading head which has a number s of sensors, the coding in the direction of the track being consecutively arranged Code elements, in particular in the direction of the line equidistantly arranged and / or regularly spaced pairs of code elements, wherein the sensors are arranged parallel to the line direction one behind the other, characterized in that by means of the sensors formed from k in the direction of the track consecutively arranged pairs of code elements codeword is detectable where k is a natural number exceeding the number two, where k is less than s and s is 4 × k + 1 or even 5 × k, the sensors covering the same length as the code word in the direction of the track, in particular re - wherein the sequence of the detected codewords is uniquely associated with movement of the mobile in the path direction of a sequence of positions of the handset - and / or wherein the coding is formed of a sequence of lines periodically arranged code sequence and wherein the code sequence formed in the direction of the track sequentially arranged code elements and wherein the sequence of the detected codewords has only a single time each code word when moving the handset in the direction of the track over the code sequence. System after Claim 3 , characterized in that only two types of pairs are provided, wherein a pair of first type has two code elements which are arranged one behind the other in the direction of the line, in particular the same length, in particular wherein the code element arranged at the front in the direction of the track represents the state HIGH, in particular 1, and the code element arranged behind in the direction of the track is LOW, in particular 0, wherein a pair of second kind is different from the pair of first sort but also two successively arranged in the direction of the track, in particular has the same length, different code elements, in particular wherein the forward direction in the direction of code element code represents the state LOW, in particular 0, and the backward arranged in the direction of the code element state HIGH, in particular 1. System according to at least one of the preceding claims, characterized in that the coding is formed from a periodically arranged in the line direction code sequence, wherein the code sequence is formed in the direction of the track consecutively arranged code elements, in particular wherein the centers of gravity or centers of the code elements in the direction of the track regularly spaced from each other are. System according to at least one of the preceding claims, characterized in that the sensors are arranged equidistantly in the path direction and / or that the centers of gravity or centers of the sensors are arranged parallel to the track direction regularly spaced from each other. System according to at least one of the preceding claims, characterized in that an evaluation unit is connected to the sensors, which determines the codeword from the sensor signals generated by the sensors. System according to at least one of the preceding claims, characterized in that the code sequence is a de Brujin sequence and / or that can be formed from the code sequence codewords at each position uniquely identify the code word forming code elements. System according to at least one of the preceding claims, characterized in that the code sequence is carried out in such a way that the codeword detected by means of the sensors of the reading head is uniquely associated with the position of the reading head in the direction of the line, in particular in the region of the code sequence, wherein a finite resolution is present, in particular wherein the resolution corresponds to the quotient of the codeword length and the sensor number. System according to at least one of the preceding claims, characterized in that the position in each case in the direction of the line has an extension which corresponds to the extension of a respective code element in the direction of the line or which corresponds to the resolution, ie in particular the position is in each case an area and / or is subject to tolerances. System according to at least one of the preceding claims, characterized in that the number of bits of the particular code word is smaller than the number of code elements of the code sequence, in particular therefore the period of the coding. System according to at least one of the preceding claims, characterized in that the sensors of the read head completely scan the codewords and / or that more sensors are distributed over the length of a codeword than the codeword has code elements. System according to at least one of the preceding claims, characterized in that parallel to the coding for coding complementary executed, further coding is provided, wherein further sensors for detecting the further coding on the reading head or on the handset are provided. System according to at least one of the preceding claims, characterized in that the sensors and / or the further sensors are magnetically biased differential Hall sensors are designed for scanning the code elements of the coding or the code elements of the further coding. System according to at least one of the preceding claims, characterized in that the material measure is made of printed or stamped material.

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