WO2018104994A1

WO2018104994A1 - Length measurement system, length measurement device, and length measurement method

Info

Publication number: WO2018104994A1
Application number: PCT/JP2016/086027
Authority: WO
Inventors: 恩田信彦
Original assignee: 富士通株式会社
Priority date: 2016-12-05
Filing date: 2016-12-05
Publication date: 2018-06-14
Also published as: JPWO2018104994A1; JP6806167B2

Abstract

This length measurement system is provided with: a band-like scale part provided with scale patterns indicating a main scale and interpolation patterns indicating a higher resolution than that indicated by the main scale; a length measurement unit that includes an indication part that is provided so as to be slidable in relation to the scale part and indicates the measurement position of an object of measurement, a reading unit for reading a main scale pattern and interpolation pattern, and a data processing unit for calculating the measurement position indicated by the indication part as a measured value on the basis of the scale pattern and interpolation pattern read by the reading unit; and a data storage unit for storing the measured value measured by the length measurement unit.

Description

Length measuring system, length measuring instrument and length measuring method

The invention disclosed in this specification relates to a length measuring system, a length measuring device, and a length measuring method.

Conventionally, length measuring devices for measuring the length have been proposed. For example, a digital display length measuring device having a rotary encoder that detects the amount of movement of a tape measure tape is known (for example, Patent Document 1). Similarly, a steel tape measure reader provided with a rotary encoder is also known (see Patent Document 2).

JP 63-263407 A JP-A-8-285542

However, in Patent Document 1 and Patent Document 2, in order to measure the length, the rotary encoder is moved along the tape measure tape or the like, and the measured value is obtained by measuring the amount of movement. In addition, presetting must be performed for measurement, and it is difficult to obtain measurement values immediately after the start of measurement, and there is room for improvement.

Therefore, the length measuring system, the length measuring device, and the length measuring method disclosed in this specification are intended to obtain measurement values immediately after the start of measurement.

In order to solve such a problem, the length measuring system disclosed in this specification includes a scale pattern indicating a main scale, and a band-shaped scale unit including an interpolation pattern indicating a position lower than the position indicated by the main scale. An indicator unit that is slidable with respect to the scale unit and points to a measurement position to be measured, a reading unit that reads the scale pattern and the interpolation pattern, and the scale pattern and the interpolation read by the reading unit A data processing unit that calculates a measurement position indicated by the instruction unit as a measurement value based on a pattern; and a data storage unit that stores a measurement value measured by the length measurement unit; Prepare.

Further, the length measuring instrument disclosed in the present specification includes a scale pattern indicating a main scale, a band-shaped scale portion including an interpolation pattern indicating a lower rank than the position indicated by the main scale, and the scale portion. Based on the scale pattern and the interpolation pattern read by the reading unit, the reading unit for reading the scale pattern and the interpolation pattern, the indication unit that is provided slidable with respect to the measurement position of the measurement target, A length measurement unit including a data processing unit that calculates a measurement position indicated by the instruction unit as a measurement value.

Further, the other length measuring device disclosed in the present specification includes a scale pattern indicating a main scale, a band-shaped scale portion including an interpolation pattern indicating a lower rank than the position indicated by the main scale, and the scale. A length measuring unit including a pointing unit that is slidable with respect to the scanning unit and points to a measurement position to be measured; and a reading unit that reads the scale pattern and the interpolation pattern.

Further, the length measurement method disclosed in the present specification includes a scale pattern indicating a main scale, and a band-shaped scale portion including an interpolation pattern indicating a position lower than the position indicated by the main scale. A step of sliding a length measuring unit provided with a reading unit for reading a pattern and a measurement in which one end of the scale unit is aligned with one end of the measurement target and an instruction unit provided in the length measurement unit is the other end of the measurement target Matching the position and determining the reading position, and calculating the measurement value based on the scale pattern and the interpolation pattern read by the reading unit at the determined reading position.

The length measuring system, length measuring device, and length measuring method disclosed in this specification can obtain measurement values immediately after starting measurement.

FIG. 1 is an explanatory diagram showing a schematic configuration of a length measurement system according to an embodiment. FIG. 2 is an explanatory diagram showing a schematic configuration of a length measuring device provided in the length measuring system of the embodiment. FIG. 3A is an explanatory diagram showing the scale unit and the length measuring device, and FIG. 3B is an explanatory diagram schematically showing the positional relationship between the scale unit and the length measuring device. 4A is an explanatory diagram showing a part of the scale portion in an enlarged manner, and FIG. 4B is an explanatory diagram showing the positional relationship between the scale portion and the photodiode array. FIG. 5 is an explanatory diagram showing an example of a bit arrangement for forming a scale pattern and an interpolation pattern. FIG. 6 is an explanatory diagram showing an example of encoding of a scale pattern. FIG. 7 is a flowchart showing an example of control during measurement by the length measuring device. FIG. 8 is an explanatory diagram for explaining the determination of the reading position. FIG. 9 is an explanatory diagram for explaining the determination of the reading position. FIG. 10 is an explanatory diagram of an interpolation pattern. FIG. 11A and FIG. 11B are explanatory diagrams showing an example of length measurement by a length measuring device. FIG. 12 is an explanatory diagram showing scale patterns and interpolation patterns in another embodiment. FIG. 13 is an explanatory diagram of an interpolation pattern according to another embodiment. FIG. 14 is an explanatory diagram showing another example of a bit arrangement that forms a scale pattern and an interpolation pattern.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. However, in the drawings, the dimensions, ratios, and the like of each part may not be shown so as to completely match the actual ones. In some cases, details are omitted in some drawings.

(Embodiment)
First, a schematic configuration of the length measurement system 100 according to the embodiment will be described with reference to FIGS. 1 to 6. FIG. 1 is an explanatory diagram showing a schematic configuration of a length measurement system according to an embodiment. FIG. 2 is an explanatory diagram showing a schematic configuration of a length measuring device provided in the length measuring system of the embodiment. FIG. 3A is an explanatory diagram showing the scale unit and the length measuring device, and FIG. 3B is an explanatory diagram schematically showing the positional relationship between the scale unit and the length measuring device. 4A is an explanatory diagram showing a part of the scale portion in an enlarged manner, and FIG. 4B is an explanatory diagram showing the positional relationship between the scale portion and the photodiode array. FIG. 5 is an explanatory diagram showing an example of a bit arrangement for forming a scale pattern and an interpolation pattern. FIG. 6 is an explanatory diagram showing an example of encoding of a scale pattern.

The length measuring system 100 includes a length measuring device 1 and a data collecting unit 70 corresponding to a data storage unit. The length measuring device 1 includes a scale unit 10 and a length measuring unit 30. The length measuring unit 30 is slidable with respect to the scale unit 10. That is, the length measuring unit 30 can move by sliding along the longitudinal direction of the scale unit 10. The scale unit 10 in the present embodiment can measure up to 150 cm. In the present embodiment, the main scale is set to 1 cm, and the resolution is set to 0.5 cm, which is a half of the main scale.

The band-shaped scale unit 10 is provided with a reading timing marker 11, a scale pattern 12 indicating a main scale, and an interpolation pattern 13. The reading timing marker 11, the scale pattern 12 indicating the main scale, and the interpolation pattern 13 are each expressed as a bit pattern. In this embodiment, as will be described in detail later, 1 bit is used for the read timing marker 11, 8 bits are used for the scale pattern 12, and 2 bits are used for the interpolation pattern 13. For convenience of explanation, the reading timing marker 11, the scale pattern 12 indicating the main scale, and the interpolation pattern 13 are drawn in a visible manner in the drawings, but all of them are actually provided by being printed with luminescent ink. ing. Since the reading timing marker 11, the scale pattern 12, and the interpolation pattern 13 printed with the luminescent ink are not visible with visible light, the user can easily see the scales and numerical values drawn on both sides of the scale unit 10. Moreover, the scale part 10 is provided with the scale which a user can visually observe similarly to a normal tape measure. In the present embodiment, visible scales are provided on both side edges of the scale portion 10. Note that the ink used is not limited to the light-emitting ink as long as it can express the code, and printing may be performed with a visible ink.

The main scale in this embodiment is provided in 1 cm increments. Referring to FIG. 1, numerical values such as 28 and 29 correspond to numerical values with main scales. The read timing marker 11 is provided side by side with the scale pattern 12 in the width direction of the scale unit 10. That is, the reading timing marker 11 is provided in alignment with the main scale and indicates the reading timing. That is, the reading unit 32a described later executes a reading operation when it passes the reading timing marker 11. Thereby, the reading unit 32a reads the main scale. Referring to FIG. 5, the read timing marker 11 is expressed using 1 bit.

The scale pattern 12 expresses the numerical value with the main scale as a bit pattern. In this embodiment, in order to express a numerical value up to 150 cm, the numerical value is expressed using 8 bits as shown in FIG. The 8 bits are arranged along the width direction of the scale unit 10. Referring to FIG. 6, numerical values for every 1 cm are encoded in binary numbers using 8 bits. In the present embodiment, the scale code 12 is further printed on the scale unit 10 as a scale pattern 12.

When encoding with simple binary numbers, for example, when the scale changes from 3 cm to 4 cm, the lower 3 bits change simultaneously in binary numbers. On the other hand, when the Gray code is used, only one bit changes. Therefore, even when a reading error occurs with respect to a changing bit, when the gray code is used, the error can be reduced when the scale is calculated from the bit string. For example, if a simple binary number representing a change from 3 cm to 4 cm is expressed, it changes by 3 bits from 011 to 100, but if this is mistakenly read by 1 bit from 011 to 110, for example, the expressed numerical value is 6cm. On the other hand, when the gray code is used, the change only changes by 1 bit from 010 to 110, so even if the reading is erroneously read from 010 to 010 by 1 bit, the scale value is 3 cm and the value before change. Become.

The interpolation pattern 13 indicates a lower rank than the position indicated by the main scale. The interpolation pattern 13 has a code assigned to each region divided in the width direction and the longitudinal direction of the scale unit 10 in accordance with the resolution. In the present embodiment, the resolution of the length measuring unit 30 is set to one half of the scale interval of the scale pattern 12, that is, 0.5 cm. For this reason, the length measuring device 1 can obtain the measurement value of 0.5 cm increments according to the position of the reading part 32a. For example, the measured value when 28.75 ≦ the position of the reading portion <29.25 is 29.0. When 29.25 ≦ reader position <29.75, 29.5. When 29.75 ≦ reader position <30.25, the measured value is 30.0. The measured value when 30.25 ≦ reader position <30.75 is 30.5. The measured value when 30.75 ≦ the position of the reading portion <31.25 is 31.0.

In order to realize this resolution, 2 bits are used in this embodiment. Specifically, the scale portion 10 is divided into two in the width direction, and the scale interval of the scale pattern 12 is divided into four along the longitudinal direction of the scale portion 10, and a code assigned to each divided region is provided. is doing. The interpolation pattern 13 will be described in detail later.

The length measuring unit 30 includes a case 31. Referring to FIGS. 3A and 3B, a photodiode array 32 forming a reading unit 32a is incorporated in the case 31. In the

photodiode array

32, 11 photodiodes are arranged in the width direction of the scale unit 10 so as to correspond to 1 bit of the reading timing marker 11, 8 bits of the scale pattern 12, and 2 bits of the interpolation pattern 13. Yes. Such an array of photodiodes forms the reading unit 32a. A measurement confirmation button 33 is provided on the side wall of the case 31. When the measurement confirmation button 33 is pressed once in a short time, the length measurement unit 30 transmits the measurement value to the data collection unit 70. By pressing and holding the measurement confirmation button 33, the length measurement unit 30 can be turned on and off. In addition, the measurement confirmation button 33 can generate a signal indicating the end of measurement at all locations by being pressed twice in a short time. A light source 34 is built in the case 31. As shown in FIG. 4B, the light source 34 is provided so as to be able to irradiate the reading timing marker 11, the scale pattern 12, and the interpolation pattern 13 printed with light emitting ink.

The case 31 is provided with a display 35. The measured value is displayed on the display 35. A battery 36 is built in the case 31. The battery 36 is used to drive the light source 34, the display 35, the data processing unit 50, and the like.

In the case 31, a data processing unit 50 is provided. The data processing unit 50 includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and a storage unit. The data processing unit 50 calculates a measurement value based on a program stored in the ROM or the storage unit. The data processing unit 50 includes a reading timing marker detection unit 51, a scale pattern detection unit 52, an interpolation pattern detection unit 53, a measurement value calculation unit 54, a measurement value determination unit 55, and a measurement value transmission unit 56. The reading timing marker detection unit 51, the scale pattern detection unit 52, and the interpolation pattern detection unit 53 are electrically connected to the reading unit 32a. The measurement value calculation unit 54 calculates a measurement value based on data acquired from the reading timing marker detection unit 51, the scale pattern detection unit 52, and the interpolation pattern detection unit 53, and causes the display 35 to display the calculated measurement value. In addition, the measurement value calculation unit 54 transmits the calculated measurement value to the measurement value determination unit 55. The measurement value determination unit 55 determines the measurement value received when the measurement confirmation button 33 is pressed. The determined measurement value is transmitted to the data collection unit 70 via the measurement value transmission unit 56. Here, in the present embodiment, the data collection unit 70 is assumed to be a so-called smartphone, notebook computer, or the like. Instead of the data collection unit 70, data may be collected in a USB memory or the like. In this case, the measured value transmission unit 56 is not necessary. Moreover, you may make it utilize what is called a cloud as a data collection part. In this case, data can be transmitted to the cloud via a smartphone or a notebook computer. Accumulating data in the cloud makes it easier to use data in other systems.

The data processing unit 50 may be provided outside the case 31. That is, the data read by the reading unit 32 a may be transmitted to the outside of the case 31 and the data may be processed outside the case 31.

The length measuring unit 30 includes an instruction unit that indicates a measurement position to be measured. In the present embodiment, the end surface 31a of the case 31 functions as an instruction unit. Referring to FIG. 1, in the present embodiment, the distance between the end surface 31a and the reading unit 32a is 1 cm. For this reason, for example, when the measurement is performed with the end face 31a set to 30 cm, the reading unit 32a reads the position of 31 cm. For this reason, in this embodiment, a value obtained by subtracting 1 cm from the value read by the reading unit 32a is used as the measurement value. In the present embodiment, the difference between the end surface 31a and the reading unit 32a is corrected at the stage of calculating the measurement value. However, the scale pattern 12 may be shifted by 1 cm in advance. That is, a pattern of 30 cm may be provided at a position that is actually 31 cm. Further, instead of such an end surface 31a, for example, an arrow may be drawn on the outer appearance of the case 31 so as to coincide with the reading unit 32a disposed inside, and this arrow may be used as an instruction unit.

Next, length measurement using the length measurement system 100 will be described with reference to FIGS. 7 to 11B. FIG. 7 is a flowchart showing an example of control during measurement by the length measuring device. 8 and 9 are explanatory diagrams for explaining the determination of the reading position. FIG. 10 is an explanatory diagram of an interpolation pattern. FIG. 11A and FIG. 11B are explanatory diagrams showing an example of length measurement by a length measuring device.

First, in step S1 of FIG. 7, the reading unit 32a starts reading a pattern when the power is turned on. The power supply is turned on by long pressing the measurement confirmation button 33. In step S2, it is determined whether or not the reading timing marker 11 indicates “1” in the read pattern. If NO is determined in step S2, the processing from step S1 is repeated. If the length measuring unit 30 moves slightly during the transition from step S2 to step S1 and passes one of the main scales, the scale pattern 12 can be read. Since the main scale is provided every 1 cm, the length measuring unit 30 can satisfy this condition only by moving slightly within 1 cm.

If it is determined YES in step S2, the process proceeds to step S3. In step S3, when YES is determined in step S2, the value of the main scale is read and grasped from the scale pattern 12 that has been read simultaneously.

In step S4 performed subsequent to step S3, an 11-bit pattern is read. Then, in step S5 performed subsequent to step S4, it is determined whether or not the reading timing marker 11 indicates “1” from the pattern read in step S4. When the reading timing marker 11 indicates “1”, it is determined as YES and the process proceeds to step S6. In step S6, the main scale value is read from the scale pattern 12. On the other hand, if NO is determined in step S5, the process proceeds to step S7. In step S7, the interpolation pattern 13 is read.

When going through step S6, skip step S8 and proceed to step S9. This is because when the reading timing marker 11 is “1”, the value of the main scale indicated by the scale pattern 12 can be adopted as the position of the reading unit 32a. On the other hand, when going through step S7, the process proceeds to step S8. In step S8, the position of the reading unit 32a is calculated from the main scale value indicated by the scale pattern 12 and the interpolation pattern 13. Here, the determination of the position of the reading unit 32a will be described with reference to FIGS.

First, the case where the length measuring unit 30 moves in the right direction with respect to the scale unit 10 will be described with reference to FIG. It is assumed that the reading position where the reading unit 32a is located when the power is turned on is a point A in FIG. Point A is located on the side larger than 30 cm, but at this time, the value of the main scale to be read is unknown. From this state, the length measuring unit 30 is moved to the right to reach point B. Point B is the position of the main scale 30 cm. At this time, the reading unit 32a reads the main scale value as 30 cm. Further, when the length measuring unit 30 is moved to the right and reaches the point C, it can be determined that the length measuring unit 30 is moving in the direction of 29 cm based on the interpolation pattern 13.

Here, the interpolation pattern 13 will be described in detail with reference to FIG. In this embodiment, 2 bits are used for the interpolation pattern 13. Specifically, an area divided into two in the width direction of the scale unit 10 is provided. One bit is assigned to this area. Referring to FIG. 10, regions a and b are formed. Further, in the areas a and b, the scale interval of the scale pattern 12 is further divided into four along the longitudinal direction of the scale portion 10. In FIG. 10, each region is expressed as a1 to a4 and b1 to b4 between the main scales. In the area a, “1” is assigned to hatched a1 to a3 among a1 to a4. On the other hand, in the area b, “1” is assigned to the hatched b2 to b4 out of b1 to b4. As a result, it is possible to determine which position the reading position is based on the combination of 1 and 0 in each area.

For example, in the case of the point C in FIG. 8, it is first known from the scale pattern 12 that the reading unit 32a is in the vicinity of the main scale 30 cm. Then, by reading that the area a is “0” and the area b is “1”, it can be seen that the length measuring unit 30 is moving in the direction of 29 cm. That is, it can be determined that the reading unit is located at a position where a4 and b4 overlap.

When the point D is applied to FIG. 10, a3 and b3 are overlapped between 30 cm and 29 cm. When the reading unit 32a of the length measuring unit 30 is located at the point D, the reading unit 32a reads that both the area a and the area b are “1”. From the reading result of the reading unit 32a, it can be determined that the measured value is 29.5 cm.

Similarly, when the E point is applied to FIG. 10, when the reading unit 32a of the length measuring unit 30 is located at the E point, where a1 and b1 overlap each other between 30 cm and 29 cm, the reading is performed. The unit 32a reads the area a as “1” and the area b as “0”. The measurement value can be determined to be 29.0 from the reading result of the reading unit 32a.

Measured value can be derived by making the same determination between 29 cm and 28 cm when the length measuring unit 30 further moves to the right and exceeds 29 cm.

Next, a case where the length measuring unit 30 moves in the left direction with respect to the scale unit 10 will be described with reference to FIG. It is assumed that the reading position where the reading unit 32a is located when the power is turned on is a point A in FIG. Point A is located on the side larger than 29 cm, but at this time, the value of the main scale to be read is unknown. From this state, the length measuring unit 30 is moved to the left to reach point B. Point B is the position of the main scale 30 cm. At this time, the reading unit 32a reads the main scale value as 30 cm. Further, when the length measuring unit 30 is moved to the left and reaches point C, it can be determined that the length measuring unit 30 is moving in the direction of 31 cm based on the interpolation pattern 13.

When the point C is applied to FIG. 10, a1 and b1 overlap each other between 30 cm and 31 cm. When the reading unit 32a of the length measuring unit 30 is located at the point C, the reading unit 32a reads that the area a is “1” and the area b is “0”. From the reading result of the reading unit 32a, it can be determined that the measured value is 30.0 cm.

When the point D is applied to FIG. 10, a2 and b2 are overlapped between 30 cm and 31 cm. When the reading unit 32a of the length measuring unit 30 is located at the point D, the reading unit 32a reads that both the area a and the area b are “1”. It becomes possible to determine that the measured value is 30.5 cm from the reading result of the reading unit 32a.

Similarly, when the point E is applied to FIG. 10, when the reading unit 32a of the length measuring unit 30 is located at the point E, where a4 and b4 overlap each other between 30 cm and 31 cm, the reading is performed. The unit 32a reads the area a as “0” and the area b as “1”. It becomes possible to determine that the measured value is 31.0 from the reading result of the reading unit 32a.

Measured value can be derived by making the same determination between 31 cm and 32 cm when the length measuring unit 30 further moves to the left and exceeds 31 cm.

Here, the determination of the measurement value based on the interpolation pattern 13 shown in FIG. 10 is summarized as follows. That is, when a4 = 0 and b4 = 1, and when a1 = 1 and b1 = 0, the value indicated by the main scale is the measured value. When a2 = 1 and b2 = 1, and when a3 = 1 and b3 = 1, a half value of the main scale becomes a measured value.

After calculating the position of the reading unit 32a in step S8 of FIG. 7, the process proceeds to step S9. In step S9, a measured value is calculated from the position of the reading unit 32a and the offset value. Here, the offset value is a distance between the reading unit 32a and the end surface 31a, and is 1 cm in the present embodiment. For example, when the reading value of the reading unit 32a is 31, 30 is output as the measurement value.

In step S10 performed subsequent to step S9, it is determined whether or not the measurement confirmation button 33 is pressed and turned on. If YES is determined in step S10, the measured value is transmitted to the data collecting unit 70 in step S11. When it is determined NO in step S10, the processes from step S4 are repeated. In step S12 performed subsequent to step S11, it is determined whether or not to continue the measurement. Specifically, it is determined whether or not the measurement confirmation button 33 is pressed twice in succession, and the user is displaying the intention to end the measurement. When the measurement is finished, the process is finished. On the other hand, if YES is determined in the step S12, the processes from the step S4 are repeated.

As described above, when the length measurement system 100 of the present embodiment is used, the length measurement unit 30 directly reads the scale pattern, so that a measurement value can be obtained immediately. In addition, by reading the interpolation pattern 13, a measured value can be obtained even when the reading unit 32a is located between the main scales. Thus, according to the length measurement system 100 of the present embodiment, the measurement value can be obtained immediately after the measurement is started.

By using such a length measurement system 100, the following length measurement method can be realized. First, the length measuring unit 30 is slid on the scale unit 10. Thereby, the position of the reading unit 32a is grasped. Then, while aligning one end of the scale unit 10 with one end of the measurement target, the end surface 31a serving as the instruction unit included in the length measurement unit 30 is matched with the measurement position serving as the other end of the measurement target, and the reading position is determined. Specifically, the measurement confirmation button 33 is pressed. Then, the measurement value is calculated based on the scale pattern 12 and the interpolation pattern 13 read by the reading unit 32a at the determined reading position. Thereby, a measured value can be obtained immediately.

The length measuring system 100 of the present embodiment can be suitably used when measuring the body dimensions of a wearer of clothes at a clothing store, for example. Conventionally, the store clerk applies a measure to the measurement site of the wearer and fills in the order sheet one by one. However, if the length measurement system 100 of this embodiment is used, the measured value is automatically stored. For example, when measuring the shoulder width, one end of the scale unit 10 may be aligned with one shoulder, the end surface 31a serving as the indicating unit may be aligned with the other shoulder serving as the measurement position, and the measurement confirmation button 33 may be pressed. At this time, the scale portion 10 has one end on one shoulder, and extends from the scale portion 10 along the shoulder toward the other shoulder.

In the above example, measurement is performed starting from one end of the scale unit 10, that is, a position where the main scale value is 0 cm. However, it is possible to cope with measurement starting from any position. For example, as shown in FIG. 11A, first, 30 cm is obtained as the first measurement value. Then, this value is stored. Next, 38 cm is obtained as the second measurement value. This value is also stored. If the difference is obtained based on these stored values, measurement can be performed with an arbitrary position as a starting point. That is, a measurement value of 8 cm can be obtained by subtracting 30 cm from 38 cm.

In this embodiment, the main scale interval is 1 cm, but the main scale interval can be set arbitrarily. For example, in the example shown in FIG. 12, the main scale interval is 2 mm. The resolution is 1 mm. The scale unit 15 includes a reading timing marker 16, a scale pattern 17, and an interpolation pattern 18. The reading timing marker 16 and the scale pattern 17 are provided every 2 mm. In addition, the interpolation pattern 18 is provided with the interval of the main graduations being ¼. Thereby, a measurement value with a resolution of 1 mm can be obtained.

Further, as shown in FIG. 13, the resolution can be further increased. In the example shown in FIG. 13, the resolution of the length measurement unit is set to one quarter of the scale interval of the scale pattern. In other words, the resolution is 0.25 mm corresponding to one-quarter of 1 cm, which is the main scale interval. In order to realize such a resolution, the interpolation pattern 19 is divided into three in the width direction of the scale portion, and the scale interval of the scale pattern is divided into eight along the longitudinal direction of the scale portion. And it has a code assigned to each divided area. The data processing unit calculates a measurement value corresponding to the resolution based on the combination of codes.

When a8 = 0, b8 = 0 and c8 = 1, and when a1 = 1, b1 = 0 and c1 = 0, the value indicated by the main scale is the measured value. When a2 = 1, b2 = 1, and c2 = 0, and when a3 = 1, b3 = 1, and c3 = 0, a value of a quarter of the main scale is a measured value. When a4 = 1, b4 = 1, and c4 = 1, and when a5 = 1, b5 = 1, and c5 = 1, two-quarter values of the main scale are measured values. When a6 = 0, b6 = 1, and c6 = 1, and when a7 = 0, b7 = 1, and c7 = 1, the value of three quarters of the main scale becomes the measurement value.

Thus, the resolution can be increased by increasing the number of bits. That is, when the resolution is higher than that in the example shown in FIG. 13, the number of bits of the interpolation pattern may be further increased.

As still another example, for example, an error signal detection code 14 may be added as shown in FIG. As the error signal detection code, a conventionally known code such as a parity code or cyclic redundancy check (CRC) can be used. Thereby, for example, the measurement value calculation unit 54 can verify whether the scale pattern 12 read by the photodiode array 32 has an error by using the error signal detection code 14. If there is an error, the scale pattern 12 is read again by the photodiode array 32. Thereby, the reliability of the measured value output from the data processor 50 can be improved.

The above-described embodiments are merely examples for carrying out the present invention, and the present invention is not limited thereto. Various modifications of these embodiments are within the scope of the present invention. It is apparent from the above description that various other embodiments are possible within the scope.

DESCRIPTION OF SYMBOLS 1

Length measuring device

10, 15

Scale part

11, 16

Reading timing marker

12, 17

Scale pattern

13, 18, 19 Interpolation pattern 14 Error signal detection code 30 Length measuring part 31 Case 31a End surface 32 Photodiode array 32a Reading part 33 Measurement confirmation Button 34 Light source 35 Display 36 Battery 50 Data processing unit 70 Data collection unit 100 Length measuring system

Claims

A scale pattern indicating a main scale, and a band-shaped scale portion including an interpolation pattern indicating a lower rank than the position indicated by the main scale;
An indicator unit that is slidable with respect to the scale unit, points to a measurement position to be measured, a reading unit that reads the scale pattern and the interpolation pattern, and the scale pattern and the interpolation pattern that are read by the reading unit. A length measuring unit including a data processing unit that calculates a measurement value indicated by the instruction unit as a measurement value,
A data storage unit for storing measurement values measured by the length measuring unit;
, A length measuring system.
The length measurement system according to claim 1, wherein the scale pattern and the interpolation pattern are each expressed by a bit pattern.
The interpolation pattern has a code assigned to each region divided in the width direction and the longitudinal direction of the scale unit according to the resolution, and the data processing unit is configured to perform the resolution based on the combination of the codes. The length measuring system according to claim 1 or 2, wherein a measured value corresponding to the value is calculated.
The resolution of the length measuring unit is one half of the scale interval of the scale pattern, and the interpolation pattern is divided into two in the width direction of the scale part and along the longitudinal direction of the scale part, The scale interval of the scale pattern is divided into four, and a code assigned to each divided area is provided, and the data processing unit calculates a measurement value corresponding to the resolution based on the combination of the codes. Item 3. The length measuring system according to item 1 or 2.
The resolution of the length measuring unit is a quarter of the scale interval of the scale pattern, and the interpolation pattern is divided into three in the width direction of the scale part and along the longitudinal direction of the scale part, The scale interval of the scale pattern is divided into 8 and has a code assigned to each divided area, and the data processing unit calculates a measurement value according to the resolution based on the combination of the codes. Item 3. The length measuring system according to item 1 or 2.
The length measurement system according to any one of claims 1 to 5, wherein the length measurement unit further includes a measurement value transmission unit that transmits the measurement value calculated by the data processing unit to the data storage unit.
The scale pattern and the interpolation pattern are provided with light emitting ink, and the length measuring unit includes a light source provided so as to irradiate the scale pattern and the interpolation pattern. The measuring system described in 1.
A scale pattern indicating a main scale, and a band-shaped scale portion including an interpolation pattern indicating a lower rank than the position indicated by the main scale;
An indicator unit that is slidable with respect to the scale unit, points to a measurement position to be measured, a reading unit that reads the scale pattern and the interpolation pattern, and the scale pattern and the interpolation pattern that are read by the reading unit. A length measuring unit including a data processing unit that calculates a measurement value indicated by the instruction unit as a measurement value,
Measuring instrument including
A scale pattern indicating a main scale, and a band-shaped scale portion including an interpolation pattern indicating a lower rank than the position indicated by the main scale;
A length measuring unit that is slidably provided with respect to the scale unit and includes an instruction unit that indicates a measurement position of a measurement target, and a reading unit that reads the scale pattern and the interpolation pattern.
Measuring instrument including
10. The length measuring instrument according to claim 8, wherein the scale pattern and the interpolation pattern are each expressed by a bit pattern.
The interpolation pattern has a code assigned to each region divided in the width direction and the longitudinal direction of the scale unit according to the resolution, and the data processing unit is configured to perform the resolution based on the combination of the codes. The length measuring device according to any one of claims 8 to 10, which calculates a measurement value according to the frequency.
The resolution of the length measuring unit is one half of the scale interval of the scale pattern, and the interpolation pattern is divided into two in the width direction of the scale part and along the longitudinal direction of the scale part, The scale interval of the scale pattern is divided into four, and a code assigned to each divided area is provided, and the data processing unit calculates a measurement value corresponding to the resolution based on the combination of the codes. Item 11. The length measuring instrument according to any one of Items 8 to 10.
The resolution of the length measuring unit is a quarter of the scale interval of the scale pattern, and the interpolation pattern is divided into three in the width direction of the scale part and along the longitudinal direction of the scale part, The scale interval of the scale pattern is divided into 8 and has a code assigned to each divided area, and the data processing unit calculates a measurement value according to the resolution based on the combination of the codes. Item 11. The length measuring instrument according to any one of Items 8 to 10.
A length measuring unit having a scale pattern indicating a main scale, and a band-shaped scale portion including an interpolation pattern indicating a position lower than the position indicated by the main scale, and a reading unit that reads the scale pattern and the interpolation pattern. Sliding process;
While aligning one end of the scale unit with one end of the measurement target, matching the instruction unit included in the length measurement unit with the measurement position serving as the other end of the measurement target, and determining the reading position;
Calculating a measurement value based on the scale pattern and the interpolation pattern read by the reading unit at the determined reading position;
Measuring method including