JP2022177556A - Measuring instrument and measuring method - Google Patents

Abstract

To provide a measuring instrument and a measuring method which can reduce an error of a measurement result.SOLUTION: A measuring instrument 100 has a first array pattern 31 and a second array pattern 32 having a plurality of patterns arrayed in a length direction, wherein any one of binary values is allocated in each of the patterns, and the first array pattern includes a measure 7 having a longer pattern length having the continuous same binary values than the second array pattern, a photoreflector 5 (PR6 to PR9) for reading out the first array pattern, a photoreflector (PR1 to PR5) for reading out the second array pattern, a hall sensor 3 for detecting a traveling direction of the measure, and a microcomputer 1 for measuring a length of a measuring object based on the traveling direction of the measure, read-out values of the PR6 to PR9 and read-out values of the PR1 to PR5.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a measuring instrument and a measuring method.

A technique in which kerfs on a take-up reel contact contacts on a circuit board to generate electrical pulses and measure small spacing displacements based on the number of pulses, and bar codes and optical readers on strips of tape. There is known a measuring device that combines a technique of measuring a larger gap displacement using . Also known is a vernier scale encoder having a main scale and a vernier scale different from the scale of the main scale (see, for example, Patent Document 2).

Japanese Patent Publication No. 8-30644 JP-A-2001-16591

Since the measuring apparatus of Patent Document 1 uses electric pulses, there is a problem that errors are likely to occur in the measurement results due to the influence of noise. In addition, there is a problem that an error is likely to occur in the measurement result due to poor contact between the kerf and the contact.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a measuring instrument and a measuring method capable of reducing errors in measurement results.

The meter of the present invention has a first row pattern and a second row pattern having a plurality of longitudinally arranged patterns, each pattern being assigned one of the binary values; The one-row pattern has a longer pattern length than the second-row pattern in which the same binary values continue, a first reading means for reading the first-row pattern, and a second reading means for reading the second-row pattern. and detection means for detecting the travel direction of the tape measure, the travel direction of the tape measure detected by the detection means, the reading value of the first reading device, and the reading value of the second reading device. and control means for measuring the length of the object to be measured.

The measurement method of the present invention has a first row pattern and a second row pattern having a plurality of patterns arranged in the length direction, each pattern being assigned one of binary values, A measuring method for a measuring instrument having a measure in which the one-row pattern has a longer pattern length than the second-row pattern in which the same binary values are consecutive, wherein a first step of reading the first-row pattern; Based on a second step of reading the row pattern, a third step of detecting the direction of travel of the measure, the direction of travel of the measure, the read value of the first row pattern, and the read value of the second row pattern and a fourth step of measuring the length of the object to be measured.

According to the present invention, errors in measurement results can be reduced.

1 is a configuration diagram of a measuring instrument according to an embodiment; FIG. It is a figure which shows the internal state of the measuring device which concerns on this Embodiment. (A) is a diagram showing an example of a pattern printed on a measure. (B) is a diagram showing an example of the arrangement of photoreflectors. FIG. 10 is a diagram showing an example of information indicating correspondence between lengths and patterns; 4 is a flow chart showing the processing performed by the measuring instrument; (A) and (B) are diagrams showing a modification of the arrangement of photoreflectors when the resolution of the measuring instrument is lowered. (A) and (B) are diagrams showing a modification of the arrangement of photoreflectors when the resolution of the measuring instrument is lowered.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a configuration diagram of a measuring instrument according to this embodiment. FIG. 2 is a diagram showing the internal state of the measuring instrument according to this embodiment. It should be noted that part of the housing 15 is omitted in FIG.

The measuring instrument 100 is, for example, a device that measures the length of an object to be measured. As shown in FIG. 1, the measuring instrument 100 includes a microcomputer 1 that calculates the length of the object to be measured, a wireless communication unit 2 that wirelessly transmits data of the calculated length of the object to be measured to an external terminal 20, a reel 8, a switch 4 for instructing the start of measurement to the microcomputer 1, a photoreflector 5 for optically reading the pattern printed on the measure 7, the microcomputer 1, the wireless communication unit 2, A battery 6 that supplies power to the hall sensor 3 and the photoreflector 5, a measure 7 printed with a plurality of patterns, a reel 8 around which the measure 7 is wound, and a magnet 9 provided in the rotating shaft of the reel 8. It has

The microcomputer 1, wireless communication section 2, hall sensor 3 and switch 4 are mounted on the substrate 11, and the photoreflector 5 is mounted on the substrate 12. As shown in FIG. As shown in FIG. 2 , the measuring instrument 100 includes a housing 15 that covers the reel 8 , substrate 11 and substrate 12 . The substrate 11 is provided at a position facing the side surface of the reel 8 , and the substrate 12 is provided at a position facing the pattern of the measure 7 . The substrates 11 and 12 are connected by an FPC (Flexible Printed Circuit) (not shown).

Returning to FIG. 1 , the microcomputer 1 is electrically connected to the wireless communication section 2 , Hall sensor 3 , switch 4 and photoreflector 5 . The wireless communication unit 2 is a communication unit such as Bluetooth (registered trademark) or wireless LAN (Local Area Network).

A photoreflector (PR) 5 includes a light emitting portion 5a that irradiates light onto the pattern printed on the measure 7, and a light receiving portion that receives reflected light from the pattern and converts it into a current or voltage having a value corresponding to the amount of received light. 5b. For example, the light emitting portion 5a is an LED (Light Emitting Diode) that emits at least one of infrared rays, visible rays and ultraviolet rays, and the light receiving portion 5b receives at least one of the infrared rays, visible rays and ultraviolet rays reflected by the pattern. It is a phototransistor that Although one photoreflector 5 is illustrated in FIG. 1, the number of photoreflectors 5 is not limited to one.

The Hall sensor 3 outputs to the microcomputer 1 a voltage corresponding to the magnetic field of the magnet 9 provided within the rotating shaft of the reel 8 . The magnet 9 is, for example, disk-shaped, and one of the two parts divided by the diameter of the disk is the N pole, and the other is the S pole. The center of the disc of the magnet 9 is provided so as to be coaxial with the rotating shaft of the reel 8 . For example, two Hall sensors 3 are provided, and one Hall sensor 3 is provided at a position separated from the other Hall sensor 3 by 90° with respect to the reel rotating shaft. Since the output voltage of the hall sensor 3 is proportional to the magnetic field strength, the microcomputer 1 detects the rotation angle of the reel 8 and the traveling direction of the measure 7 (pull-out direction or winding direction) based on the output voltages from the two hall sensors 3. can do. For example, an absolute angle of 0° to 360° is calculated by arctan calculation based on the output voltage of one Hall sensor 3 and the output voltage of the other Hall sensor 3 which is 90° out of phase with respect to the one output voltage. can be detected. The Hall sensor 3 and the microcomputer 1 function as detection means for detecting the traveling direction of the measure 7 . Sensors for detecting the traveling direction of the measure 7 and the rotation angle of the reel 8 are not limited to Hall sensors. For example, a pattern may be provided on the outer peripheral edge of the side surface of the reel, and a photoreflector that optically reads the pattern may be used as the sensor for detecting the rotation angle of the reel 8 .

The microcomputer 1 (control means) is a processor such as a CPU (Central Processing Unit). The microcomputer 1 includes a memory 1a that stores information (see FIG. 4) indicating the correspondence between length data and patterns. The microcomputer 1 controls on/off of the photoreflector 5 and reads the current value or voltage value output from the photoreflector 5 . Since the reflectance differs depending on the color of the pattern, and the amount of light received by the photoreflector 5 varies according to the reflectance, the microcomputer 1 can determine the color of the pattern read from the current value or voltage value output from the photoreflector 5. is.

Further, the microcomputer 1 compares the color of the read pattern with the information indicating the correspondence between the length and the pattern stored in the memory 1a to calculate the length of the object to be measured. The information indicating the correspondence relationship between the length and the pattern is, for example, the table shown in FIG. 4 that associates the length with the combination of pattern colors. Information indicating the correspondence between the length and the pattern is stored in the memory 1a, but may be stored in the external terminal 20 and read by the microcomputer 1 from the external terminal 20 as necessary.

The measure 7 is a metal convex measure. As shown in FIG. 2, the tip of the measure 7 is attached with a stopper 7a. The front surface of the measure 7 is on the rotating shaft side of the reel 8, and scales and patterns indicating the length are printed on the front surface of the measure 7, and nothing is printed on the back surface. A photoreflector 5 is provided so as to face the front surface of the measure 7 . The scales are printed on both widthwise ends of the measure, and the pattern is placed between the scales printed on both ends so as not to interfere with the length measurement by the scales. The pattern is printed every fixed length. The patterns are white or black and correspond to either binary value. The color of the pattern is not limited to white and black. As long as the two types of patterns can be distinguished at the time of reading, other combinations of colors, patterns with the same hue but different densities and brightness, and patterns with different reflectances can be used. Two different patterns or the like may be used. Here, for convenience, these are also treated as "different colors".

The external terminal 20 is a communication terminal having a wireless communication function such as a computer or a smart phone, and receives data on the length of the object to be measured from the wireless communication unit 2 and manages it.

FIG. 3A is a diagram showing an example of a pattern printed on the measure 7. FIG. FIG. 3B is a diagram showing an example of the arrangement of the photoreflectors 5. As shown in FIG. In FIG. 3B, the photoreflectors 5 are shown as PR1 to PR9. Black is indicated by hatching.

As shown in FIG. 3A, the pattern printed on the measure 7 has a first row pattern 31 and a second row pattern 32 extending in the length direction of the measure 7 . The pattern printed on measure 7 comprises a plurality of row patterns 25 along the length of measure 7 . One row pattern includes a first column pattern 31 and a second column pattern 32 arranged in the same row. One pattern included in each of the first row pattern 31 and the second row pattern 32 is pattern 21 . The length of each pattern 21 in the lengthwise direction of the measure 7 is 1 mm. Each pattern 21 is assigned one of the binary values (white or black). In FIG. 3A, the borders of each pattern 21 are marked with lines for easy understanding, but the borders do not have to be drawn on the major.

40 rows of first column patterns 31 and second column patterns 32 shown in FIG. 3A are repeatedly printed on the measure 7 . In the first row pattern 31, white and black patterns are arranged at 4 cm intervals. The second row pattern 32 has white and black patterns arranged at intervals of 10 mm. In this way, the first row pattern 31 has a longer pattern length of consecutive identical binary values than the second row pattern 32 . Preferably, in the length direction, the pattern length of the first row pattern 31 in which the same binary values are consecutive is N times (N=2 or more) the pattern length of the second row pattern 32 in which the same binary values are consecutive. integer). In the example of FIG. 3A, the pattern length (2 cm) of the first row pattern 31 in which the same binary values are consecutive in the length direction is the pattern of the second row pattern 32 in which the same binary values are consecutive. 4 times the length (5 mm).

As shown in FIG. 3B, PR6 to PR9 (first reading means) are arranged facing the first row pattern 31, and PR1 to PR5 (second reading means) are arranged in the second row pattern 32. They are arranged facing each other. Each of PR1 to PR9 reads the color of one opposing pattern 21 . The distance between PR6 and PR7 and between PR8 and PR9 is 10 mm, and the distance between PR6 and PR8 and between PR7 and PR9 is 4 mm. The distance between PR1 and PR2, the distance between PR2 and PR3, the distance between PR3 and PR4, and the distance between PR4 and PR5 is 2 mm.

FIG. 4 is a diagram showing an example of information indicating the correspondence between the length and the read values of PR1 to PR9. A scale T1 of 0 to 39 mm shown on the left side of FIG. 4 indicates the length of the pattern printed on the measure shown in FIG. Indicates the length to be used when calculating the length of the object to be measured. Based on the read values of PR1 to PR9, any length from 0 to 19 mm to be used for calculation can be specified from the scale T2. . Since the pattern shown in FIG. 3A is read by the photoreflector arranged as shown in FIG. occur. As described above, the information in FIG. 4 is stored in memory 1a.

In FIG. 4, "1" indicates white and "0" indicates black, but the actual pattern does not include numerical values such as "1" and "0". The reflectance of the pattern is higher in white than in black. For example, when reading white and black patterns, the voltage values output from PR1 to PR9 are, for example, 2.0 V and 1.0 V, respectively.

For example, if the color read by PR4 and PR5 is black and the color read by PR1 to PR3 and PR6 to 9 is white, the value of PR1 to PR9 indicates 0 mm on the first row in FIG. In this case, the microcomputer 1 determines that the length of the object to be measured is the sum of 0 mm and N×20 mm on the first line in FIG. It should be noted that N indicates the number of times the first row pattern 31 changes between black and white, which is read by the PR6 and the Hall sensor 3 (described later) and exists up to the length of the object to be measured. In the first row pattern 31, black and white changes occur at intervals of 2 cm. , PR1 to PR9 and the values obtained from the information in FIG. 4, the length of the object to be measured can be measured.

For example, if the color read by PR1 to PR3 is black, the color read by PR4 to PR9 is white, and the number of times of change N is 4, the microcomputer 1 determines that the length of the object to be measured is 85 mm ( = 4 x 20 + 5 mm). When the color read by PR1 to PR3 and PR6 to PR9 is black, the color read by PR4 and PR5 is white, and the number of changes N is 1, the microcomputer 1 determines the length of the object to be measured. is 25 mm (=1×20+5 mm).

Next, the measuring method will be explained.

In the present embodiment, measuring instrument 100 has two operation modes, a constant monitoring mode (first mode) and a monitoring mode during measurement (second mode).

In the constant monitoring mode, when the switch 4 is not pressed after the power is turned on, the microcomputer 1 detects the rotation angle of the reel 8 based on the output voltage of the hall sensor 3 (that is, the traveling direction of the measure 7) and the first line by PR6. Based on the readings of the pattern 31, the length of the object to be measured is estimated. Here, the roughly measured length is a length that increases or decreases every 2 cm corresponding to the period of the first row pattern 31, and is a length with coarse accuracy.

In the monitoring mode during measurement, the microcomputer 1 reads the first row pattern 31 by PR6 to PR9 and the second row pattern by PR1 to PR5 until a predetermined period (for example, 3 seconds) has passed since the switch 4 was pressed. Based on the readings of the pattern 32, the length of the object to be measured is precisely measured. Here, the length to be precisely measured is a length that increases or decreases by 1 mm corresponding to the length of each pattern 21 in the length direction, and is a length with higher accuracy than the length measured in the constant monitoring mode.

The reason for using the read value of the first column pattern 31 by PR6 in the monitoring mode during measurement is as follows.

For example, when the read value of the first row pattern 31 by PR6 is not used, the microcomputer 1 calculates the rotation amount calculated according to the rotation angle of the reel 8 (that is, the traveling direction of the measure 7) and the number of rotations, and the PR1 The length of the object to be measured is measured based on the length calculated according to the read value of the second row pattern 32 by PR5. In the second row pattern 32, white and black patterns are alternately arranged at 5 mm intervals, so the read values of PR1 to PR5 at a certain position deviate by ±Q cm (where Q is an integer equal to or greater than 1) from that position. It will be the same as the read values of PR1 to PR5 at the other position. For this reason, an error of several centimeters or more may occur from the actual length of the object to be measured. In particular, since the convex measure is thicker and harder than the tape-shaped measure, it may be loosely wound around the reel 8 and the amount of rotation of the reel 8 may not match the amount of withdrawal or winding of the convex measure, which is likely to cause an error. . In the present embodiment, PR6 counts pattern changes between white and black in the first row pattern 31 to obtain N values, and the length is calculated by combining information obtained from PR1 to PR5. Since the pull-out amount or winding amount of the measure is measured based on the first row pattern 31 printed on the measure 7 in this manner, no measurement error occurs even if the measure 7 is loosely wound around the reel 8. - 特許庁

The reason why PR6 to PR9 are provided is as follows. The read values of the second row pattern 32 by PR1 to PR5 are the same read values at 10 mm intervals. When the read values of the first row pattern 31 by PR6 to PR9 are not used for length measurement in the monitoring mode during measurement, the first row pattern 31 alternately arranges white and black patterns at intervals of 10 mm. In this embodiment, the read values of PR6 to PR9 are used for length measurement in the monitoring mode during measurement, and the white or black period of the first row pattern 31 can be set to 20 mm. By setting the white or black period of the first row pattern 31 to 20 mm, skipping of the first row pattern 31 in the constant monitoring mode can be suppressed, and the increase or decrease in the rotation angle of the reel 8 can be easily detected, resulting in a measurement error. decreases.

The reason for providing two monitoring modes is as follows. Nine photoreflectors (PR1 to PR9) must be used to precisely measure the length of the object to be measured. When nine photoreflectors 5 are used all the time, there is a problem that power consumption increases. In this embodiment, two operation modes are provided: a constant monitoring mode using only PR6 out of nine photoreflectors 5 and a monitoring mode during measurement using nine photoreflectors 5 . In the constant monitoring mode, when the switch 4 is not pressed after the power is turned on, the length of the object to be measured is approximated, so the measurement is performed for a longer period than in the monitoring mode during measurement. Since the photoreflector 5 used in the constant monitoring mode is only PR6, power consumption can be suppressed compared to the case where nine photoreflectors 5 are used. In the monitoring mode during measurement, nine photoreflectors 5 (PR1 to PR9) are used. Since it is limited to a short period of time up to, power consumption can be further suppressed.

In FIG. 3B, nine photoreflectors 5 PR1 to PR9 are provided, but the pattern of FIG. 3A can be measured with seven photoreflectors PR1 to PR7. be. PR8 and PR9 are provided to suppress measurement errors and improve measurement accuracy. For example, as shown in FIG. 3B, when PR1 to PR9 are not located on the boundary between patterns but are located on each pattern, the length of the object to be measured can be accurately determined only by PR1 to PR7. can be measured.

On the other hand, if PR1 to PR7 are positioned on the boundary between patterns, there is a possibility that a measurement error will occur, so PR8 to PR9 are provided to suppress such a measurement error. The reason why PR8 and PR9 are provided will be described in detail below.

As shown in FIG. 4, the correspondence between the length and the pattern is one-to-one correspondence, and the value of one photoreflector 5 changes when the length of PR1 to PR5 shifts by 1 mm. Since there is a possibility of erroneous reading of color at the portion where the color changes, even if one photoreflector 5 misreads the color, the maximum error is ±1 mm.

However, the values of PR1 to PR7 at 9 mm and 10 mm on the scale T1 in FIG. 4 change at the same time. As for the values of PR1 to PR7 at 19 mm and 20 mm on the scale T1 in FIG. 4, the values of PR6 and PR1 change at the same time. The values of PR1 to PR7 at 29 mm and 30 mm on the scale T1 in FIG. 4 change at the same time. As for the values of PR1 to PR7 at 39 mm and 0 mm (40 mm) on the scale T1 in FIG. 4, the values of PR6 and PR1 change at the same time.

Since the values of both photoreflectors 5 do not always change at the same time, it is possible that only one photoreflector 5 will change and the other photoreflector 5 will not change. In this case, the values output from PR1 to PR7 match the pattern at a position different from the reading position, resulting in a large measurement error.

For example, if the output from PR1 to PR6 is "011001" when reading the boundary between 9 mm and 10 mm on the scale T1 in FIG. , PR1 to PR7 will be the same as the pattern at the position of 19 mm on the scale T1. Therefore, the microcomputer 1 determines that the position of 19 mm is being read, resulting in an error of about 10 mm.

PR8 to PR9 are provided to suppress such measurement errors. Since the reading result of PR8 and PR9 does not become "10" when reading the position of 19 mm on the scale T1, the value of PR8 and PR9 is "1" when the reading result of PR1 to PR7 is "0110010" in the above example. and "0", the microcomputer 1 can determine that the reading position is the boundary between 9 mm and 10 mm on the scale T1 in FIG. Similarly, when the values of PR8 and PR9 are "0" and "0", the microcomputer 1 can determine that the reading position is the boundary between 19 mm and 20 mm in FIG.

Next, processing executed by the measuring instrument 100 will be described.

FIG. 5 is a flow chart showing the processing performed by the measuring instrument 100. As shown in FIG. Assume that the measuring instrument 100 is in the constant monitoring mode after the power is turned on and before the switch 4 is pressed.

First, the microcomputer 1 determines whether or not the switch 4 has been pressed (S1). When the switch 4 is not pressed (NO in S1), the PR6 always operates in the constant monitoring mode, reads the color of the first row pattern 31, and sends the microcomputer 1 the current value or voltage value corresponding to the read color. is output (S2). The microcomputer 1 determines the change between black and white based on the current value or voltage value of PR6 (S3). The microcomputer 1 counts the number of times N of changes between black and white. If there is no change between black and white (NO in S3), the procedure returns to S1.

If there is a change between black and white (YES at S3), the microcomputer 1 detects the rotation angle of the reel 8 and the traveling direction of the measure 7 based on the output voltage from the hall sensor 3 (S4). When the measure 7 is pulled out or wound up, the hall sensor 3 outputs to the microcomputer 1 a voltage corresponding to the magnetic field of the magnet 9 provided within the rotating shaft of the reel 8 . As a result, the microcomputer 1 can detect the rotation angle of the reel 8 and the traveling direction of the measure 7 based on the output voltage from the Hall sensor 3 . For example, when the measure 7 is pulled out, the rotation angle of the reel 8 increases, and when the measure 7 is wound up, the rotation angle of the reel 8 decreases.

If the travel direction of the measure 7 is the pull-out direction, the microcomputer 1 increments the count value of the number of times N of changes between black and white by 1 (S5), and the procedure returns to S1. If the traveling direction of the tape measure 7 is the winding direction, the microcomputer 1 decrements the count value of the number N of changes by 1 (S6), and the procedure returns to S1.

When the switch 4 is pressed (YES in S1), the microcomputer 1 switches the operation mode to the monitoring mode during measurement, and PR1 to PR9 are switched until a predetermined period (for example, 3 seconds) elapses after the switch 4 is pressed. is operated (S7). PR1 to PR9 read the colors of the first row pattern 31 and the second row pattern 32, and output current values or voltage values corresponding to the read colors to the microcomputer 1 (S7).

The microcomputer 1 refers to the information in FIG. 4 to calculate the values corresponding to the read colors of PR1 to PR9 (S8), and the value obtained by multiplying the number of times of change N counted in S5 or S6 by 20 mm and The length of the object to be measured is measured by adding the value calculated in (S9). The measured length is stored in the memory 1a and output to the external terminal 20 (S10). With the above, the present processing ends.

The number of sensors and the length of each pattern 21 when the resolution of the measuring instrument 100 is lowered will be described below.

When the minimum unit length that can be measured by the measuring instrument 100, that is, the resolution of the measuring instrument 100 is 1 mm, which is the length of one pattern 21, as shown in FIG. are arranged so as to face the second row pattern 32 at .

FIGS. 6A, 6B, 7A, and 7B are diagrams showing modifications of the arrangement of the photoreflector 5 when the resolution of the measuring instrument 100 is lowered. The minimum number of photoreflectors 5 (PR6 and PR7) facing the first row pattern 31 in FIGS. 6A, 6B and 7A, 7B is the number It is the same as the minimum number of photoreflectors 5 facing one row pattern 31 . Although PR8 and PR9 are omitted in FIGS. 6A and 6B and FIGS. 7A and 7B, PR8 and PR9 may be provided.

In FIG. 6A, four photoreflectors 5 (PR1 to PR4) are arranged to face the second row pattern 32 at intervals of 2.5 mm. In this case, the resolution of the measuring instrument 100 and the length of one pattern 21 are 1.25 mm. In FIG. 6B, three photoreflectors 5 (PR1 to PR3) are arranged to face the second row pattern 32 at intervals of 10/3 mm. In this case, the resolution of the measuring instrument 100 and the length of one pattern 21 are 5/3 mm. In FIG. 7A, two photoreflectors 5 (PR1 and PR2) are arranged to face the second row pattern 32 at intervals of 2.5 mm. In this case, the resolution of the measuring instrument 100 and the length of one pattern 21 are 2.5 mm. In FIG. 7B, only PR1 is arranged to face the second row pattern 32. In FIG. In this case, the resolution of the measuring instrument 100 and the length of one pattern 21 are 5 mm.

Thus, when the resolution of the measuring instrument 100 is lowered, the number of photoreflectors 5 facing the second row pattern 32 can be reduced. As shown in FIG. 7B, when the resolution of the measuring instrument 100 is set to 5 mm, the required number of photoreflectors 5 can be reduced to three (PR1, PR6 and PR7).

As described above, according to the present embodiment, the measuring instrument 100 roughly measures the length of the object to be measured based on the traveling direction of the measure 7 and the read value of PR6, and reads PR6 to PR9. and the read values of PR1 to PR5, and measure the length of the object to be measured with little error based on the roughly measured length and the precisely measured length. can be done. More specifically, the measuring instrument 100 increases the length of continuous white or black in the first row pattern 31 and lowers the resolution, but improves the reading accuracy by PR6, and uses the second row pattern 32 Reading shorter interval lengths compensates for the reduced resolution, thus reducing error in the measurement results. In addition, since the electrical pulse generated by contact between the groove and the contact, which is described in Patent Document 1, is not used, it is possible to avoid errors in measurement results due to the influence of noise. In addition, it is possible to avoid errors in measurement results due to poor contact between the grooves and the contacts.

It should be noted that the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention.

1 microcomputer, 2 wireless communication unit, 3 hall sensor, 4 switch, 5 photo reflector, 6 battery, 7 measure, 8 reel, 9 magnet, 20 external terminal, 100 measuring instrument

Claims (8)

a first row pattern and a second row pattern having a plurality of patterns arranged lengthwise, each pattern being assigned one of binary values, said first row pattern being associated with said second row pattern; a measure whose pattern length of consecutive identical binary values is greater than the column pattern;
a first reading means for reading the first row pattern;
a second reading means for reading the second row pattern;
detection means for detecting the traveling direction of the measure;
control means for measuring the length of the object to be measured based on the traveling direction of the measure detected by the detection means, the reading value of the first reading means, and the reading value of the second reading means; A measuring instrument characterized by: a first mode in which the control means measures the length of the object to be measured based on the traveling direction of the measure detected by the detection means and the read value of the first reading means;
The control means has a second mode for measuring the length of the object based on the reading value of the first reading means and the reading value of the second reading means. Item 1. The measuring instrument according to item 1. 3. The measuring instrument according to claim 1, wherein said detecting means is a sensor for detecting an angle of a reel on which said measure is wound. The first reading means comprises at least two readers facing the first row pattern, and the second reading means comprises at least one reader facing the second row pattern. 4. A measuring instrument according to any one of claims 1-3. said first reading means comprises at least two readers facing said first row pattern;
3. The first mode uses one of the readers of the first reading means, and the second mode uses all of the readers of the first reading means. 2. The measuring instrument according to 2. 5. A meter according to claim 4, wherein said first reading means comprises two further readers each longitudinally separated from said two readers by a predetermined distance. a first row pattern and a second row pattern having a plurality of patterns arranged lengthwise, each pattern being assigned one of binary values, said first row pattern being associated with said second row pattern; A measuring method for a measuring instrument having a measure having a pattern length of consecutive identical binary values longer than a row pattern,
a first step of reading the first column pattern;
a second step of reading the second column pattern;
a third step of detecting the traveling direction of the measure;
and a fourth step of measuring the length of the object to be measured based on the traveling direction of the measure, the read value of the first row pattern, and the read value of the second row pattern. Method. The mode of operation of the instrument is
a first mode for measuring the length of the object based on the traveling direction of the measure and the read value of the first row pattern;
a second mode for measuring the length of the measurement object based on the read value of the first row pattern and the read value of the second row pattern;
The measuring method according to claim 7, comprising:

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