CN205027230U - Gray code area intelligence tape measure - Google Patents

Abstract

The utility model discloses a Gray code belt intelligent measuring tape, which reduces the volume of the intelligent measuring tape by directly arranging Gray codes on the measuring tape belt and repeatedly arranging the Gray codes on the measuring tape belt according to a specified period, rather than printing Gray code discs and arranging the Gray code discs in the intelligent measuring tape body; meanwhile, each gray code in one period has a black code or a white code with a certain width, and the gray codes on the tape measure belt can be read through the reading device, so that the traditional scale reading mode is replaced, and the reading stability is enhanced.

Description

A gray code tape smart tape measure

technical field

The utility model relates to the technical field of intelligent tape measure, in particular to an intelligent tape measure with Gray code.

Background technique

Gray code belongs to reliability coding, which is a kind of coding method which minimizes errors. Because, although the natural binary code can be directly converted into an analog signal by a digital/analog converter, in some cases, for example, when converting from 3 to 4 in decimal, every bit of the binary code will change, which can cause the digital circuit to generate a large signal. large peak current pulses. The Gray code does not have this shortcoming. When it switches between adjacent bits, only one bit changes. It greatly reduces the confusion of logic when going from one state to the next. Since there is only one bit difference between two adjacent code groups of this kind of encoding, in the conversion between the linear displacement of the direction and the digital quantity, when the linear displacement changes slightly (which may cause the digital quantity to change) , the Gray code only changes one bit, which is more reliable than other codes that change two or more bits at the same time, which can reduce the possibility of error.

In the prior art, Gray code discs are often used for detection or counting. When the encoder or brush device reads the Gray code disc, brush skipping or missing brushes often occur, that is, due to the excessive speed of the brush device, brushes appear. The device jumps over a certain Gray code, resulting in counting errors, which is not conducive to the use of Gray codes. At the same time, setting the gray code disc in the smart tape measure body takes up a large internal space, making the device bulky.

Therefore, the prior art still needs to be improved and developed.

Utility model content

In view of the deficiencies in the prior art above, the purpose of this utility model is to provide an intelligent tape measure with Gray code tape, aiming at solving the problems in the prior art when the common length scale is printed on the tape of the tape measure, or there is an error in the reading when the tape is printed on the tape measure. The gray code disc is arranged inside, which leads to the defect that the volume of the device is relatively large.

The technical scheme of the utility model is as follows:

A gray code tape smart tape measure, which includes a smart tape measure body, and a tape that can be drawn out and is arranged in the smart tape measure body, and a gray code is set on the tape measure tape.

The intelligent tape measure with Gray code tape, wherein, a Gray code reading device for reading the Gray code on the tape tape is also arranged in the body of the intelligent tape measure.

The intelligent measuring tape with Gray code tape, wherein, at least one linear Gray code track is provided on the front and back sides of the tape measure tape, and a plurality of counting Gray codes are set on the Gray code track.

The gray code tape intelligent tape measure, wherein, the front and back of the tape measure tape are provided with 3 gray code tracks from bottom to top.

The gray code tape intelligent tape measure, wherein, the front of the tape measure tape is provided with three lower gray code tracks, which are respectively the first gray code track, the second gray code track and the third gray code track.

The gray code tape smart tape measure, wherein, the side of the intelligent tape measure body facing the front side of the tape measure tape is provided with 3 gray code reading devices, which are respectively the first gray code reading device and the second gray code reading device. device and a third Gray code reading device; wherein, the first Gray code reading device is facing the first Gray code track, and the second Gray code reading device is facing the second Gray code track, the third Gray code reading device is facing the third Gray code track.

The intelligent measuring tape with Gray code tape, wherein, the back of the measuring tape is provided with three high-digit Gray code tracks, which are the fourth-digit Gray code track, the fifth-digit Gray code track and the sixth-digit Gray code track.

The Gray code tape intelligent tape measure, wherein, the side of the intelligent tape measure body facing the back of the tape measure tape is provided with three Gray code reading devices, which are respectively the fourth Gray code reading device and the fifth Gray code reading device. device and a sixth Gray code reading device; wherein, the fourth Gray code reading device is facing the fourth Gray code track, and the fifth Gray code reading device is facing the fifth Gray code track, the sixth Gray code reading device is facing the sixth Gray code track.

The intelligent tape measure with Gray code tape, wherein the Gray code on the tape measure tape is repeatedly set at a specified period.

Beneficial effects: the intelligent measuring tape with Gray codes described in the utility model directly sets the Gray codes on the measuring tape, and the Gray codes are repeatedly set on the measuring tape according to a specified cycle, instead of printing the Gray code disk and setting it on the In the body of the smart tape measure, the volume of the smart tape is reduced; at the same time, each Gray code in a cycle has a black or white code with a certain width, and the Gray code on the tape can be read by the reading device, replacing the traditional The unique scale reading method enhances the stability of the reading.

Description of drawings

Fig. 1 is a structural schematic diagram of a preferred embodiment of the gray code smart tape measure of the present invention.

Fig. 2 is an exploded view of a preferred embodiment of the gray code smart tape measure of the present invention.

Fig. 3 is a schematic diagram of the front of the tape measure in a preferred embodiment of the gray code tape smart tape measure of the present invention.

Fig. 4 is a schematic diagram of the back of the tape measure in a preferred embodiment of the gray code tape smart tape measure of the present invention.

detailed description

The utility model provides an intelligent measuring tape with Gray code. In order to make the purpose, technical solution and effect of the utility model clearer and clearer, the utility model will be further described in detail below. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

Please refer to Fig. 1-Fig. 2 at the same time, wherein Fig. 1 is a schematic structural diagram of a preferred embodiment of the intelligent tape measure with Gray code according to the present invention, and Fig. 2 is an explosion of a preferred embodiment of the intelligent tape measure with Gray code according to the present invention As shown in the figure, the gray code tape smart tape measure includes a smart tape measure body 100, and a tape measure tape 200 that is set in the smart tape measure body 100 and can be drawn out, and the tape measure tape 200 is provided with a Gray code. Further, as shown in FIG. 2 , a Gray code reading device 300 for reading the Gray code on the tape measure tape 200 is also provided in the smart tape measure body 100 .

During specific implementation, the smart tape body is also provided with a display screen for displaying the real-time reading and status of the smart tape; A wireless transceiver module for data; a power supply for power supply is also arranged in the smart tape measure body. More specifically, the display is an E-ink display, TN display, STN display or TFT display; the wireless transceiver module is a Bluetooth module.

Further, as shown in FIG. 3 and FIG. 4 , at least one linear Gray code track 210 is provided on the front and back sides of the measuring tape 200 , and a plurality of counting Gray codes are provided on the Gray code track 210 . During specific implementation, as shown in FIGS. 1 and 2 , the smart tape measure body 100 is provided with a tape measure tape outlet 110 , and a location close to the tape measure tape outlet 110 in the smart tape measure body 100 is provided with a gray code channel. 210 corresponds to the Gray code reading device 300 one by one.

Since all gray code tracks 210 are arranged on the same side of the tape measure tape 200, the width of the tape measure tape 200 will be increased, that is, the height of the tape measure tape outlet 110 will be increased, that is, the thickness of the smart tape measure body 100 will be increased, thereby increasing the overall The size of the smart tape measure is not convenient for users to carry.

If the gray code track 210 is arranged on both sides of the tape measure tape 200, the width of the tape measure tape 200 can be reduced, which is beneficial to reduce the volume of the smart tape measure and is convenient for users to carry.

For example, when there are 6 Gray code tracks 210 on the measuring tape 200, N Gray code tracks (where 1≤N≤6, and N is a positive integer) can be set on the front, and (6-N) can be set on the back. Gray codes. Because the height of each Gray code track 210 is equal and is a fixed value, the sum of the heights of the Gray code tracks 210 on the same side of the tape measure tape 200 is equal to the width of the tape measure tape 200, so when the Gray code track 210 on the front side of the tape measure tape 200 When the number differs from the number of Gray code tracks 210 on the back side of the tape measure tape 200 by 1 or is completely equal, the width of the tape measure tape 200 can be reduced to a minimum value.

Preferably, as shown in Figure 3 and Figure 4, the front and back of the tape measure tape 200 are provided with three Gray code tracks 210 from bottom to top; It is the first Gray code track 211, the second Gray code track 212 and the third Gray code track 213; The five-digit Gray code track 215 and the sixth-digit Gray code track 216.

During specific implementation, as shown in FIG. 3 , the first Gray code track 211 is provided with a first Gray code track black code and a first Gray code track white code that appear alternately in black and white in turn, and the first Gray code track white code is arranged on the first Gray code track 211. The maximum width of the bit gray code channel black code is 2mm. As shown in Figure 4, the fourth Gray code track 214 is provided with a fourth Gray code track black code and a fourth Gray code track white code which alternately appear in black and white successively, and the fourth Gray code track black code The maximum width of the code is 16mm. When the maximum width of the first gray code track black code is set to 2mm, then each length cycle in the sixth gray code track 216 is 64mm (that is, the black code only appears once in the same cycle, and only One white code), that is, the repetition period L _T of the 6-digit Gray code set in the measuring tape 200 is 64mm. Similarly, when the maximum width of the first gray code and the black code is set to 4 mm, the repetition period L _T of the 6-digit Gray code is 128 mm. Since 6 gray code tracks are set on the tape measure tape 200, and when the repetition period _LT of the 6-bit gray code is 64mm, when the user extracts the tape measure tape 200 at various speeds, it will not make the gray The code reading device 300 misses counting the number of repetitions of the repetition period L _T , so the repetition period L _T of the 6-digit Gray code can be set to 64 mm during specific implementation.

In order to more clearly illustrate the setting method of the 6-digit Gray code on the measuring tape 200 of the present invention, further description will be given below through the 6-digit Gray code tables shown in Table 1-Table 4 and Fig. 3 and Fig. 4 .

serial number 6-bit gray code The upper 3 bits correspond to decimal numbers The lower 3 bits correspond to decimal numbers serial number 6-bit gray code The upper 3 bits correspond to decimal numbers The lower 3 bits correspond to decimal numbers 1 000000 0 0 9 001100 1 7 2 000001 0 1 10 001101 1 6 3 000011 0 2 11 001111 1 5 4 000010 0 3 12 001110 1 4 5 000110 0 4 13 001010 1 3 6 000111 0 5 14 001011 1 2 7 000101 0 6 15 001001 1 1 8 000100 0 7 16 001000 1 0

Table 1

serial number 6-bit gray code The upper 3 bits correspond to decimal numbers The lower 3 bits correspond to decimal numbers serial number 6-bit gray code The upper 3 bits correspond to decimal numbers The lower 3 bits correspond to decimal numbers 17 011000 2 0 25 010100 3 7 18 011001 2 1 26 010101 3 6 19 011011 2 2 27 010111 3 5 20 011010 2 3 28 010110 3 4 twenty one 011110 2 4 29 010010 3 3 twenty two 011111 2 5 30 010011 3 2 twenty three 011101 2 6 31 010001 3 1 twenty four 011100 2 7 32 010000 3 0

Table 2

serial number 6-bit gray code The upper 3 bits correspond to decimal numbers The lower 3 bits correspond to decimal numbers serial number 6-bit gray code The upper 3 bits correspond to decimal numbers The lower 3 bits correspond to decimal numbers 33 110000 4 0 41 111100 5 7 34 110001 4 1 42 111101 5 6 35 110011 4 2 43 111111 5 5 36 110010 4 3 44 111110 5 4 37 110110 4 4 45 111010 5 3 38 110111 4 5 46 111011 5 2 39 110101 4 6 47 111001 5 1 40 110100 4 7 48 111000 5 0

table 3

serial number 6-bit gray code The upper 3 bits correspond to decimal numbers The lower 3 bits correspond to decimal numbers serial number 6-bit gray code The upper 3 bits correspond to decimal numbers The lower 3 bits correspond to decimal numbers 49 101000 6 0 57 100100 7 7 50 101001 6 1 58 100101 7 6 51 101011 6 2 59 100111 7 5 52 101010 6 3 60 100110 7 4 53 101110 6 4 61 100010 7 3 54 101111 6 5 62 100011 7 2 55 101101 6 6 63 100001 7 1 56 101100 6 7 64 100000 7 0

Table 4

It can be seen from the 6-bit Gray code table in Table 1-Table 4 that the repetition period of the 6-bit Gray code is 64, and the Gray code with the sequence number (M+1) is compared with the Gray code with the sequence number M (where 1 ≤M≤63), and only one digit has changed (from 1 to 0, or from 0 to 1). If the black code is marked as 0 and the white code is marked as 1, then the above 64 6-digit Gray codes are printed from one end of the tape 200 to the other end in sequence. For example, the 6-digit Gray code of 000000 with the serial number 1 is set at the end where the starting point is located. Specifically, the highest bit (that is, the sixth bit) 0 of the 6-digit Gray code is set at the sixth Gray code channel 216, and the second highest bit (ie, The fifth bit) 0 is set in the fifth Gray code track 215, the fourth bit 0 is set in the fourth Gray code track 214, the third bit 0 is set in the third Gray code track 213, and the second lowest bit (ie The second bit) 0 is set in the second Gray code track 212, and the lowest bit (that is, the first bit) 0 is set in the first Gray code track, the heights of the above 6 codes are equal to the heights of the corresponding Gray code tracks, The above-mentioned 6 codes are all rectangular strips, and the width of the rectangular strips is 1mm. In this way, according to the serial numbers shown in Table 1-Table 4, the Gray codes are set on the tape measure tape 200 in sequence, and the results shown in Figure 3 and Figure 4 can be obtained. tape measure tape 200 as shown. Wherein, on the front of the tape measure tape 200 as shown in Figure 3, the first Gray code track 211, the second Gray code track 212 and the third Gray code track 213 are arranged in sequence from top to bottom, the tape measure shown in Figure 4 The sixth Gray code track 216 , the fifth Gray code track 215 and the fourth Gray code track 214 are sequentially arranged on the back of the belt 200 from top to bottom.

When the front and back of the tape 200 of the smart tape measure are provided with three Gray code tracks 210 from bottom to top, a Gray code reading device 300 corresponding to the Gray code tracks 210 is also provided, and each The irradiation range of the infrared light emitted by a Gray code reading device does not exceed the height range of each Gray code track 210 . Specifically, the first Gray code reading device is facing the first Gray code track 211, the second Gray code reading device is facing the second Gray code track, and the third Gray code reading device is facing the gray code track 211. The third Gray code track 213, the fourth Gray code reading device is facing the fourth Gray code track 214, the fifth Gray code reading device is facing the fifth Gray code track 215, and the sixth Gray code reading device is facing the fifth Gray code track 215. The code reading device is facing the sixth Gray code track 216 . The above six Gray code reading devices are respectively connected to the corresponding I/O ports of the MCU control chip in the smart tape measure body 100 .

Since three Gray code reading devices 300 are respectively arranged on both sides of the tape measure tape 200, if the Gray code reading devices on both sides of the tape measure tape 200 are completely facing, then the Gray code reading device 300 on the tape measure tape 200 side sends When the infrared rays pass through the measuring tape 200 , the result of receiving the infrared light by the Gray code reading device 300 on the other side will change, which will affect the measurement results.

In order to ensure the accuracy of the measurement results, the starting point of the gray code track on the front of the measuring tape 200 and the starting point of the gray code track on the back of the measuring tape 200 need to be misaligned. Since when the tape measure tape 200 is in the state of not being pulled out initially, the first Gray code reading device is facing the starting point of the first Gray code track 211, and the second Gray code reading device is facing the first gray code reading device. The starting point of the two-bit Gray code track 212, the third Gray code reading device is facing the starting point of the third Gray code track 213, and the fourth Gray code reading device is facing the starting point of the fourth Gray code track 214 , the fifth Gray code reading device is facing the starting point of the fifth Gray code track 215, and the sixth Gray code reading device is facing the starting point of the sixth Gray code track 216. Because there is misalignment in the starting point of the Gray code track on both sides of the tape measure tape 200, the first Gray code reading device, the second Gray code reading device and the third Gray code reading device distributed on one side of the tape measure tape 200 are right The position of the pair is misaligned by a certain distance with respect to the positions facing the fourth Gray code reading device, the fifth Gray code reading device and the sixth Gray code reading device distributed on the other side of the measuring tape 200 . During specific implementation, the offset distance between the starting point of the Gray code track on the front side of the measuring tape 200 and the starting point of the Gray code track on the back side of the tape measure tape 200 is 3-10 mm. Optimally, the misalignment distance between the starting point of the Gray code track on the front side of the measuring tape 200 and the starting point of the Gray code track on the back side of the tape measure tape 200 is 5.5mm.

Because black codes and white codes appear in a certain period on each gray code track 210, and white codes and black codes appear alternately. At the same time, the black code and the white code have different absorption rates to the infrared light emitted by the Gray code reading device 300. Specifically, the black code has a high absorption rate to the infrared light, and the white code has a low absorption rate to the infrared light, which is lower than that of the black code. Infrared light absorption rate, the infrared light reflected by the black code is received by the Gray code reading device 300 and decoded as 0, and the infrared light reflected by the white code is received by the Gray code reading device 300 and decoded as 1.

Therefore, when the tape measure tape 200 is being pulled, the Gray code reading device 300 and the MCU control chip arranged in the smart tape measure body 100 and connected to the Gray code reading device 300 jointly detect that the tape measure tape 200 is being pulled. The number n of repetition period length and the offset ΔL within the current repetition period length can be calculated by L=n*L _T +ΔL to obtain the actual measurement length L, so as to achieve accurate measurement of the length and reduce the measurement error . Since the Gray code 200 on the tape is read by the Gray code reading device 300 instead of being directly read by the user, the result of the read data is stable and the probability of error is small.

To sum up, the gray code tape intelligent tape measure described in the utility model, by setting the Gray code directly on the tape tape, and repeatedly setting the Gray code on the tape tape according to the specified cycle, instead of printing the Gray code disc, and It is set in the body of the smart tape measure, which reduces the volume of the smart tape measure; at the same time, each Gray code in a period has a black code or white code with a certain width, and the Gray code on the tape tape can be read by the reading device, replacing It replaces the traditional scale reading method and enhances the stability of the reading.

It should be understood that the application of the present utility model is not limited to the above examples, and those skilled in the art can improve or change according to the above description, and all these improvements and changes should belong to the protection of the appended claims of the present utility model scope.

Claims (9)

1. A smart measuring tape with a Gray code, characterized in that it comprises a smart tape measure body, and a tape measure tape that is arranged in the smart tape measure body and can be drawn out, and the tape measure tape is provided with a Gray code. 2 . The intelligent tape measure with Gray code according to claim 1 , wherein a Gray code reading device for reading the Gray code on the tape tape is also arranged in the body of the intelligent tape measure. 3 . 3. according to the described gray code tape intelligent tape measure of claim 2, it is characterized in that, the positive and negative sides of described tape measure tape are all provided with at least one straight-line Gray code track, and the Gray code track of a plurality of counts is provided with. code. 4. The intelligent tape measure with Gray code according to claim 3, characterized in that 3 Gray code tracks are arranged on the front and back sides of the tape measure from bottom to top. 5. according to the described Gray code tape intelligent tape measure of claim 4, it is characterized in that, the front of described tape measure tape is provided with low three Gray code tracks, is respectively the first Gray code track, the second Gray code track and the third gray code track. Bit Gray coded. 6. according to the described gray code tape intelligent tape measure of claim 5, it is characterized in that 3 Gray code reading devices are arranged on the side facing the front side of the tape measure tape in the intelligent tape measure body, respectively reading the first Gray code device, a second Gray code reading device, and a third Gray code reading device; wherein, the first Gray code reading device is facing the first Gray code track, and the second Gray code reading device is facing For the second Gray code track, the third Gray code reading device is facing the third Gray code track. 7. according to the described gray code band intelligent tape measure of claim 5, it is characterized in that, the back side of described tape is provided with high three-digit Gray code track, is respectively the 4th Gray code track, the 5th Gray code track and the 6th digit. Gray coded. 8. according to the described gray code tape intelligent tape measure of claim 7, it is characterized in that 3 Gray code reading devices are arranged on the side facing the back side of the tape measure tape in the intelligent tape measure body, respectively read the fourth Gray code device, the fifth Gray code reading device, and the sixth Gray code reading device; wherein, the fourth Gray code reading device is facing the fourth Gray code track, and the fifth Gray code reading device is facing For the fifth Gray code track, the sixth Gray code reading device is facing the sixth Gray code track. 9. The intelligent tape measure with Gray code tape according to claim 1, characterized in that, the Gray code on the tape measure tape is repeatedly set according to a specified period.