WO2023100418A1 - Dispositif de mesure - Google Patents

Dispositif de mesure Download PDF

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Publication number
WO2023100418A1
WO2023100418A1 PCT/JP2022/029377 JP2022029377W WO2023100418A1 WO 2023100418 A1 WO2023100418 A1 WO 2023100418A1 JP 2022029377 W JP2022029377 W JP 2022029377W WO 2023100418 A1 WO2023100418 A1 WO 2023100418A1
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Prior art keywords
imaging
unit
measurement
image
marker
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PCT/JP2022/029377
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English (en)
Japanese (ja)
Inventor
貴雄 井川
雄之 野中
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株式会社アドヴィックス
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Publication of WO2023100418A1 publication Critical patent/WO2023100418A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness

Definitions

  • the present invention relates to a measuring device that measures the size of an object to be measured.
  • Patent Document 1 discloses a measuring device for measuring brake linings of electromagnetic brakes.
  • this measuring device an image including a marker and brake lining previously attached to at least one of the brake lining and braking portion of the electromagnetic brake is captured, and the actual size (hereinafter referred to as "actual size") in the image is taken. measures the thickness of the brake lining with reference to known marker dimensions (number of pixels).
  • An object of the present invention is to prevent the size of an object to be measured from becoming unmeasurable.
  • a measuring device for solving the above-mentioned problems is a measuring device for measuring the size of an object to be measured, wherein the light emitting unit emits light, and the light emitting unit irradiates the object to be measured or an object other than the object to be measured with light.
  • an imaging unit that captures an image for measurement including a marker, which is a light image displayed on the surface of the object, and the measurement target; and an image of the measurement target based on the measurement image captured by the imaging unit and a measuring unit for measuring the size.
  • the marker is a light image displayed on the surface of the measurement target irradiated with light from the light emitting unit or on the surface of the object other than the measurement target. Since the marker is a light image formed by the light emitting unit irradiating the object to be measured or an object other than the object to be measured with light, the marker can be displayed in the measurement image regardless of the degree of dirt on the object to be measured or the object other than the object to be measured. can be identified. Therefore, it is possible to prevent the size of the object to be measured from becoming impossible.
  • FIG. 1 is a side view schematically showing a friction brake of a vehicle.
  • FIG. 2 is a plan view schematically showing part of the same friction brake.
  • FIG. 3 is a diagram showing a schematic configuration of the measuring device of the first embodiment.
  • FIG. 4 is a block diagram of an industrial endoscope in the measuring device.
  • FIG. 5 is a block diagram showing functions of the measuring device.
  • (a) is a schematic diagram showing the positional relationship between the imaging unit and the imaging target when the imaging angle is 90°
  • (b) is a schematic diagram showing the marker formed on the imaging target at that time. It is a diagram.
  • FIG. 6 is a side view schematically showing a friction brake of a vehicle.
  • FIG. 2 is a plan view schematically showing part of the same friction brake.
  • FIG. 3 is a diagram showing a schematic configuration of the measuring device of the first embodiment.
  • FIG. 4 is a block diagram of an industrial endoscope in the measuring device.
  • FIG. 5 is a block
  • FIG. 7 is a schematic diagram showing the positional relationship between the imaging unit and the imaging target when the imaging angle is not 90°, and (b) is a schematic diagram showing the marker formed on the imaging target at that time. It is a diagram.
  • FIG. 8 is a schematic diagram showing an example of an image captured by an imaging unit.
  • FIG. 9 is a schematic diagram showing an example of a measurement image captured by the imaging unit.
  • FIG. 10 is a flow chart showing the flow of processing in the measuring device of the first embodiment.
  • FIG. 11 is a schematic diagram showing how the probe head of the industrial endoscope is inserted into the inspection window.
  • FIG. 12 is a flow chart showing the flow of processing in the measuring device of the second embodiment.
  • FIG. 1 is a schematic diagram of a friction brake 10 provided on a vehicle.
  • FIG. 2 is a plan view schematically showing a portion of the friction brake 10 when the friction brake 10 is viewed from the direction indicated by the white arrow A11 shown in FIG.
  • the friction brake 10 shown in FIGS. 1 and 2 is a disc brake.
  • the friction brake 10 includes a caliper 11 supported by the vehicle body, two friction members 12, and a disk rotor 13 rotating integrally with the vehicle wheel. As shown in FIG. 2, the friction material 12 is supported by the back plate 14. As shown in FIG. A disc rotor 13 is interposed between two friction members 12 .
  • the caliper 11 is provided with an inspection window 11a.
  • the disk rotor 13, the friction material 12, and the back plate 14 can be visually recognized.
  • FIG. 3 is a configuration diagram showing an outline of the measuring device 20 of this embodiment.
  • the measuring device 20 is a device that measures the thickness D of the friction material 12 of the friction brake 10 . That is, the measuring device 20 measures the thickness D, which is the size of the friction material 12 to be measured.
  • the measuring device 20 includes an industrial endoscope 30 , a computing device 40 , a display device 51 and a notification device 53 .
  • FIG. 4 is a block diagram of the industrial endoscope 30. As shown in FIG. As shown in FIG. 3, the industrial endoscope 30 has a main body 31, a connection cable 33, a control unit 35 and a probe 37. As shown in FIG.
  • the probe 37 has a connecting portion 371 , a movable portion 372 and a probe head 373 .
  • a connecting portion 371 is provided at one end of the probe 37
  • a probe head 373 is provided at the other end of the probe 37 .
  • the probe 37 is connected to the control unit 35 via a connection 371 .
  • the movable portion 372 is movable to change the orientation of the probe head 373 as shown in FIG. In this embodiment, the movable part 372 can change the orientation of the probe head 373 by 90° or more.
  • the probe head 373 has a light emitting section 374 that emits light and an imaging section 375 that captures an image of the object to be measured.
  • the light emitting section 374 emits parallel light.
  • the light emitting section 374 includes a semiconductor laser that emits laser light.
  • the beam shape of the light emitted by the light emitting section 374 is a perfect circle.
  • the light emitting unit 374 displays a marker MK, which is a light image, on the surface of the irradiation target by irradiating the irradiation target with light (see FIG. 8).
  • the irradiation target of the light emitting unit 374 is the friction material 12 or other members existing around the friction material 12 (for example, the disk rotor 13 and the back plate 14). .
  • the imaging unit 375 forms an image by imaging the marker MK and the periphery of the display position of the marker MK.
  • the image capturing unit 375 captures a measurement image including the friction material 12 to be measured and the marker MK described above.
  • the main body 31 has a display screen 311 and an operation section 312. An image captured by the imaging unit 375 of the probe 37 is displayed on the display screen 311 .
  • the operation unit 312 is provided with a plurality of buttons operated by the operator using the industrial endoscope 30 .
  • the operation unit 312 includes, as buttons, a light emission button 312a and an imaging button 312b.
  • the light emission button 312a is a button operated by the operator when causing the light emission unit 374 to emit light or stopping the light emission of the light emission unit 374 .
  • the imaging button 312b is a button operated by the operator when causing the imaging unit 375 to capture an image.
  • the main body 31 may be a device dedicated to the industrial endoscope 30, or may be a general device.
  • a general device a mobile device such as a mobile phone can be considered.
  • the buttons of the operation unit 312 are not limited to physical buttons.
  • the light emission button 312a and the imaging button 312b may be buttons displayed on a display device having a touch panel.
  • the main body 31 can communicate with the computing device 40.
  • the communication between the main body 31 and the computing device 40 may be wired communication or wireless communication.
  • the main body 31 transmits the measurement image captured by the imaging unit 375 to the computing device 40 .
  • a connection cable 33 connects the main body 31 and the control unit 35 .
  • the control unit 35 has an operating wheel 351 and an actuator 352 .
  • Actuator 352 is built in control unit 35 .
  • the operation wheel 351 is operated by the operator when changing the orientation of the probe head 373 .
  • the actuator 352 operates according to the operation. As a result, the movable portion 372 is moved to change the orientation of the probe head 373 .
  • computing device 40 comprises communication device 41 and processing circuitry 42 .
  • the communication device 41 receives information transmitted from the industrial endoscope 30 and outputs the information to the processing circuit 42 .
  • the processing circuit 42 has an execution unit 421 and a storage unit 422 .
  • the execution unit 421 is a CPU.
  • the storage unit 422 stores a control program that the execution unit 421 executes at predetermined intervals.
  • the storage unit 422 stores a control program for measuring the thickness D of the friction material 12 based on the measurement image captured by the imaging unit 375 of the industrial endoscope 30 .
  • the display device 51 displays the thickness D of the friction material 12 calculated by the calculation device 40 .
  • the notification device 53 notifies the operator of the content instructed by the calculation device 40 .
  • the notification device 53 may be a speaker that notifies the worker by sound, a lamp that notifies the worker by light, or a screen that notifies the worker by display. It may be a vibration generator that notifies the operator by vibration.
  • FIG. 5 is a block diagram showing the functions of the measuring device 20.
  • the processing circuit 42 functions as the imaging angle estimating section 71, the imaging distance estimating section 75, and the measuring section 80 by the executing section 421 executing the control program.
  • An angle condition notification unit 72 and a distance condition notification unit 76 are configured by the processing circuit 42 and the notification device 53 .
  • the imaging angle estimation unit 71 estimates the imaging angle ⁇ of the friction material 12 by the imaging unit 375 by analyzing the image captured by the imaging unit 375 . Although details will be described later, the imaging angle estimator 71 estimates the imaging angle ⁇ based on the shape of the marker MK in the image.
  • the angle condition notification unit 72 outputs a measurement image, which is an image for measuring the thickness D of the friction material 12, when the imaging angle ⁇ estimated by the imaging angle estimation unit 71 is within a predetermined angle range.
  • the operator is notified that imaging is possible. If the imaging angle ⁇ deviates significantly from 90°, the distortion of the shape of the marker MK increases, which may reduce the accuracy of the calculation for estimating the thickness D of the friction material 12 based on the measurement image. Therefore, a predetermined angle range is set as a criterion for determining whether or not the accuracy of the estimation calculation of the thickness D of the friction material 12 is within the allowable range.
  • the predetermined angle range is the range of imaging angles ⁇ including 90°.
  • the imaging distance estimation unit 75 estimates the imaging distance L, which is the linear distance between the imaging unit 375 and the friction material 12, by analyzing the image captured by the imaging unit 375. Although details will be described later, the imaging distance estimator 75 estimates the imaging distance L based on the dimensions of objects other than the friction material 12 in the image.
  • the distance condition notification unit 76 notifies the operator that the image for measurement can be captured when the imaging distance L estimated by the imaging distance estimation unit 75 is within a predetermined distance range.
  • the accuracy of the calculation for estimating the thickness D of the friction material 12 based on the measurement image may vary depending on the imaging distance L. Therefore, a predetermined distance range is set as a criterion for determining whether the accuracy of the estimation calculation of the thickness D of the friction material 12 is within the allowable range.
  • the measurement unit 80 measures the thickness D of the friction material 12 based on the image for measurement captured by the imaging unit 375 .
  • the measurement unit 80 measures the thickness D of the friction material 12 based on the dimension of the marker MK in the measurement image, although the details will be described later.
  • FIG. 6 (a) is a schematic diagram showing the positional relationship between the imaging target 100 and the probe head 373 when the imaging angle ⁇ is 90°, and (b) is formed on the imaging target 100 at that time.
  • FIG. 4 is a schematic diagram showing a marker MK;
  • FIG. 7 (a) is a schematic diagram showing the positional relationship between the imaging target 100 and the probe head 373 when the imaging angle ⁇ is not 90°, and (b) is formed on the imaging target 100 at that time.
  • FIG. 4 is a schematic diagram showing a marker MK; 6(a) and 7(a) indicate the optical axis of the light emitting section 374. As shown in FIG.
  • the marker MK formed on the imaging target 100 has a perfect circular shape.
  • the horizontal direction in the drawing is defined as "first direction X1”
  • the direction orthogonal to first direction X1 is defined as second direction X2.
  • the dimension F1 of the marker MK in the first direction X1 is equal to the dimension F2 of the marker MK in the second direction X2.
  • the dimension F1 is equal to the dimension F2" means that they are substantially the same, and some error is allowed.
  • the marker MK formed on the imaging target 100 has an elliptical shape. That is, the dimension F1 of the marker MK in the first direction X1 is longer than the dimension F2 of the marker MK in the second direction X2.
  • the aspect ratio ⁇ is 1 when the imaging angle ⁇ is 90°.
  • the aspect ratio ⁇ does not become 1 when the imaging angle ⁇ is not 90°.
  • the more the imaging angle ⁇ deviates from 90° the greater the degree of deviation of the aspect ratio ⁇ from 1.
  • the imaging angle estimation unit 71 estimates the imaging angle ⁇ based on the shape in the image IMG even though the actual shape is known. For example, the imaging angle estimator 71 estimates the imaging angle ⁇ so that the closer the aspect ratio ⁇ of the marker MK is to 1, the closer the imaging angle ⁇ is to 90°. In other words, the imaging angle estimator 71 estimates the imaging angle ⁇ such that the imaging angle ⁇ deviates from 90° as the aspect ratio ⁇ deviates from 1.
  • FIG. 8 is a diagram showing an image IMG captured by the imaging unit 375 and including the friction material 12 and other members present around it.
  • a marker MK is displayed on the surface of the disk rotor 13 adjacent to the friction material 12.
  • the light emitted by the light emitting unit 374 is parallel light. Therefore, the dimension of the marker MK displayed on the surface of the disk rotor 13 does not change with the imaging distance L. In other words, the dimensions of the marker MK are substantially the same as the design values of the dimensions of the marker MK in the light emitting portion 374 .
  • the friction brake 10 although the friction material 12 wears, the disk rotor 13 and the back plate 14 hardly wear. Therefore, the thicknesses of the disk rotor 13 and the back plate 14 hardly change from when they are new. That is, the thicknesses of the disk rotor 13 and the back plate 14 are substantially the same as the design values.
  • the horizontal dimension (number of pixels) F3 of the marker MK in the image IMG shown in FIG. 8 the horizontal dimension (number of pixels) F41 of the disk rotor 13 in the image IMG, and the back plate 14 in the left-right direction in the drawing (the number of pixels) F42 changes depending on the imaging distance L.
  • the longer the imaging distance L the smaller the dimensions F3, F41, and F42.
  • the imaging distance estimation unit 75 estimates the imaging distance L based on the relationship between the size (the number of pixels) in the image IMG of the object whose actual shape is known and the known actual size of the object. For example, the imaging distance estimation unit 75, based on the relationship between the dimension F3 of the marker MK in the image IMG, the dimension F41 of the disc rotor 13 in the image IMG, or the dimension F42 of the back plate 14 in the image IMG, and the corresponding design value, The imaging distance L can be estimated.
  • the imaging distance estimating unit 75 calculates the imaging distance as the distance ratio ⁇ decreases.
  • the imaging distance L is estimated so that L becomes longer.
  • FIG. 9 is a diagram showing a measurement image IMG1 including the friction material 12, other members located around the friction material 12, and the markers MK.
  • the measurement unit 80 determines the first boundary B1 between the friction material 12 and the disc rotor 13 and the boundary between the friction material 12 and the back plate 14. A certain second boundary B2 is detected. Subsequently, measurement unit 80 measures an in-image distance F5, which is the distance between first boundary B1 and second boundary B2 in measurement image IMG1, and measures in-image marker distance F5, which is the dimension of marker MK in measurement image IMG1. Measure the dimension F6.
  • the intra-image distance F5 is the dimension of the friction material 12 in the measurement image IMG1 in the horizontal direction in the figure.
  • the thickness D of the friction material 12 can be measured based on the in-image distance F5 and the in-image marker dimension F6.
  • the measurement unit 80 can calculate the thickness D using the following relational expression (Formula 1). Thereby, the measuring unit 80 calculates the thickness D of the friction material 12 so that the thickness increases as the ratio of the in-image distance F5 to the in-image marker dimension F6 increases.
  • FIG. 10 is a flow chart showing the flow of processing in the measuring device 20.
  • FIG. 11 is a schematic diagram showing how the probe head 373 is inserted into the inspection window 11a of the caliper 11. As shown in FIG.
  • the operator inserts the probe head 373 of the industrial endoscope 30 into the inspection window 11 a of the caliper 11 .
  • the imaging unit 375 and the light emitting unit 374 are inserted into the inspection window 11a. This process corresponds to the "insertion step".
  • the operator inserts the probe head 373 toward the friction brake 10 through the gap formed in the wheel of the wheel.
  • the operator operates the operation wheel 351 of the control unit 35 of the industrial endoscope 30 to change the imaging range of the imaging unit 375 , and the image IMG displayed on the display screen 311 is used as the inspection window.
  • Check the position of 11a The operator then inserts the probe head 373 into the inspection window 11a while viewing the image IMG displayed on the display screen 311.
  • step S11 of FIG. 10 the execution unit 421 of the calculation device 40 determines that the worker has issued a light emission instruction to cause the light emission unit 374 to emit light (S11: YES). ), the process proceeds to step S13.
  • step S13 the execution unit 421 causes the light emitting unit 374 to start emitting light.
  • a marker MK is displayed on the surface of the friction material 12 or the disk rotor 13 as shown in FIG.
  • a marker MK may be displayed on the surface of the back plate 14 .
  • Step S13 corresponds to a "marker display step" of displaying a marker MK on the surface of the friction material 12, the disk rotor 13, or the back plate .
  • the execution unit 421 proceeds to the process of step S15.
  • step S11 determines in step S11 that there is no light emission instruction by the operator (S11: NO)
  • the current processing ends.
  • step S ⁇ b>15 the execution unit 421 estimates the imaging angle ⁇ by functioning as the imaging angle estimation unit 71 .
  • the image IMG captured by the imaging unit 375 is transmitted from the industrial endoscope 30 to the computing device 40 .
  • the executing unit 421 estimates the imaging angle ⁇ based on the received image IMG.
  • the execution unit 421 estimates the imaging distance L by functioning as the imaging distance estimation unit 75 . Specifically, the execution unit 421 estimates the imaging distance L based on the image IMG transmitted from the industrial endoscope 30 to the computing device 40 .
  • step S19 the execution unit 421 determines whether or not the imaging angle ⁇ estimated in step S15 is within a predetermined angle range. If the imaging angle ⁇ is outside the predetermined angle range (S19: NO), the execution unit 421 terminates this process. On the other hand, when the imaging angle ⁇ is within the predetermined angle range (S19: YES), the execution unit 421 proceeds to the process of step S21.
  • step S21 the execution unit 421 uses the notification device 53 to notify the operator that the imaging angle ⁇ is within a predetermined angle range. That is, the process of step S21 is executed by the execution unit 421 and the notification device 53 functioning as the angle condition notification unit 72.
  • FIG. 1 the process of step S21 is executed by the execution unit 421 and the notification device 53 functioning as the angle condition notification unit 72.
  • step S23 the execution unit 421 determines whether or not the imaging distance L estimated in step S17 is within a predetermined distance range. If the imaging distance L is outside the predetermined distance range (S23: NO), the execution unit 421 terminates the current process. On the other hand, if the imaging distance L is within the predetermined distance range (S23: YES), the execution unit 421 proceeds to the process of step S25.
  • step S25 the execution unit 421 uses the notification device 53 to notify the operator that the imaging distance L is within a predetermined distance range. That is, the processing of step S25 is executed by the execution unit 421 and the notification device 53 functioning as the distance condition notification unit 76.
  • FIG. 1 the processing of step S25 is executed by the execution unit 421 and the notification device 53 functioning as the distance condition notification unit 76.
  • the measurement image It is determined that the imaging condition for IMG1 is satisfied.
  • the execution unit 421 proceeds to the process of step S26.
  • step S26 the execution unit 421 determines whether or not the operator has issued an image capturing instruction to cause the image capturing unit 375 to capture the measurement image IMG1. Specifically, the execution unit 421 determines whether or not the operator has operated the imaging button 312b. If the execution unit 421 determines that there is no imaging instruction from the operator (S26: NO), it ends the current process, and if it determines that there is an imaging instruction from the operator (S26: YES), the process proceeds to step S27. do.
  • step S27 the execution unit 421 captures the measurement image IMG1 using the imaging unit 375.
  • Step S ⁇ b>27 corresponds to the “imaging step” of capturing the measurement image IMG ⁇ b>1 including the marker MK and the friction material 12 .
  • Step S29 the executing section 421 measures the thickness D of the friction material 12 by functioning as the measuring section 80.
  • Step S29 corresponds to the "measurement step” of measuring the thickness D of the friction material 12 based on the measurement image IMG1.
  • step S31 the execution unit 421 notifies the operator of the thickness D of the friction material 12 measured in step S29.
  • the execution unit 421 causes the display device 51 to display the thickness D of the friction material 12 .
  • the execution unit 421 ends the current process.
  • the thickness D of the friction material 12 is measured based on the size of the marker MK in the measurement image IMG1.
  • the marker MK is a light image displayed on the surface of the friction material 12, the disk rotor 13, or the back plate 14 when the light emitting part 374 irradiates the friction material 12 or the disk rotor 13 with light.
  • the marker MK is not attached to the friction material 12, the disk rotor 13, or the back plate 14 in advance. Therefore, even if the friction material 12, the disk rotor 13, and the back plate 14 are dirty due to the use of the friction brake 10, the marker MK can be identified in the measurement image IMG1 regardless of the degree of dirt.
  • the thickness D of the friction material 12 can be measured based on the size of the marker MK.
  • the measurement image IMG1 is captured on condition that the imaging angle ⁇ is within a predetermined angle range. Accordingly, the thickness D of the friction material 12 can be accurately measured using the measurement image IMG1 in which the difference between the imaging angle ⁇ and 90° is not large.
  • the measurement image IMG1 is captured on condition that the imaging distance L is within a predetermined distance range. Accordingly, the thickness D of the friction material 12 can be accurately measured using the measurement image IMG1 when the imaging distance L is within the predetermined distance range.
  • the thickness D, imaging angle ⁇ , and imaging distance L of the friction material 12 are estimated based on the marker MK in the image captured by the imaging unit 375 . Therefore, it is preferable that the process of identifying the marker MK in the image captured by the imaging unit 375 (hereinafter referred to as "marker identification process”) be simple.
  • both the light emitting unit 374 and the imaging unit 375 are provided in the probe head 373 so that the relationship between the light irradiation direction of the light emitting unit 374 and the imaging direction of the imaging unit 375 is maintained. Therefore, the marker MK is displayed in a predetermined area of the image captured by the imaging unit 375 . As a result, it is possible to set the target range of the marker identification processing in the image captured by the imaging unit 375, thereby reducing the processing amount of the marker identification processing.
  • the shape of the marker MK is a perfect circle. In this manner, by designing the shape of the marker MK in the light emitting unit 374 to be easily recognizable in the measurement image IMG1, it is possible to simplify the processing content of the marker identification processing.
  • the imaging unit 375 of the industrial endoscope 30 starts capturing a moving image when the imaging button 312b of the main body 31 is operated. Frames forming the moving image are then sequentially transmitted to the computing device 40 .
  • FIG. 12 is a flow chart showing the flow of processing in the measuring device 20. As shown in FIG.
  • the operator inserts the probe head 373 of the industrial endoscope 30 into the inspection window 11a of the caliper 11 (see FIG. 11). This process corresponds to the "insertion step”.
  • step S51 of FIG. 12 the execution unit 421 of the calculation device 40 determines that the operator has issued a light emission instruction (S51: YES), and performs the process of step S53. transition to In step S53, the execution unit 421 causes the light emitting unit 374 to start emitting light. In this embodiment, step S53 corresponds to the "marker display step”. After that, the execution unit 421 shifts the process to step S54.
  • step S51 determines in step S51 that there is no light emission instruction by the operator (S51: NO)
  • step S54 the execution unit 421 determines whether or not the operator has instructed the imaging unit 375 to capture the measurement image IMG1. Specifically, the execution unit 421 determines whether or not the operator has operated the imaging button 312b. If the execution unit 421 determines that there is no imaging instruction from the operator (S54: NO), it ends the current process, and if it determines that there is an imaging instruction from the operator (S54: YES), the process proceeds to step S55. do.
  • step S55 the execution unit 421 causes the imaging unit 375 to start capturing a moving image. Then, in step S57, the execution unit 421 estimates the imaging angle ⁇ by functioning as the imaging angle estimating unit 71, as in step S15 of the first embodiment. In step S59, the execution unit 421 estimates the imaging distance L by functioning as the imaging distance estimation unit 75, as in step S17 of the first embodiment.
  • step S61 the execution unit 421 determines whether or not the imaging angle ⁇ estimated in step S57 is within a predetermined angle range, as in step S19 of the first embodiment. If the imaging angle ⁇ is outside the predetermined angle range (S61: NO), the execution unit 421 ends the current process. On the other hand, when the imaging angle ⁇ is within the predetermined angle range (S61: YES), the execution unit 421 proceeds to the process of step S63.
  • step S63 the execution unit 421 determines whether or not the imaging distance L estimated in step S59 is within a predetermined distance range, as in step S23 of the first embodiment. If the imaging distance L is outside the predetermined distance range (S63: NO), the execution unit 421 ends the current process. On the other hand, when the imaging distance L is within the predetermined distance range (S63: YES), the execution unit 421 proceeds to the process of step S65.
  • step S65 the execution unit 421 acquires the frame of the moving image captured by the imaging unit 375 as the measurement image IMG1.
  • the imaging angle ⁇ is a value within a predetermined angle range
  • the imaging distance L is a value within a predetermined distance range is obtained as the measurement image IMG1.
  • step S67 the execution unit 421 causes the notification device 53 to notify the operator that the measurement image IMG1 has been captured.
  • the processing of step S67 is executed by the execution unit 421 and the notification device 53 functioning as the angle condition notification unit 72 and the distance condition notification unit 76, respectively.
  • step S69 the execution unit 421 measures the thickness D of the friction material 12 based on the measurement image IMG1 acquired in step S65 by functioning as the measurement unit 80, as in step S29 of the first embodiment. .
  • step S69 corresponds to the "measurement step”.
  • step S71 the execution unit 421 notifies the operator of the thickness D of the friction material 12 measured in step S69 in the same manner as in step S31 of the first embodiment. Then, the execution unit 421 ends the current process.
  • the imaging unit 375 when the imaging unit 375 starts capturing a moving image, frames of the moving image are sequentially transmitted to the computing device 40 . Therefore, the computing device 40 can individually analyze a plurality of frames forming a moving image. That is, in the calculation device 40, the imaging angle ⁇ must be a value within a predetermined angle range (hereinafter referred to as “imaging angle condition”), and the imaging distance L must be a value within a predetermined distance range (hereinafter “imaging distance condition”).
  • the frame is acquired as the measurement image IMG1, and the thickness D of the friction material 12 is measured based on the measurement image IMG1. That is, the measurement image IMG1 is acquired after both the imaging angle ⁇ is within a predetermined angle range and the imaging distance L is within a predetermined distance range. Therefore, it is possible to save the labor of the operator who operates the imaging button 312b.
  • the imaging distance L is estimated based on the size of the marker MK in the measurement image IMG1.
  • the imaging distance L may be estimated based on the magnitude at .
  • the imaging distance L may be estimated based on the size of the disk rotor 13 or the size of the back plate 14 .
  • the thickness D of the friction material 12 is measured based on the measurement image IMG1. Therefore, the operator may be notified that the thickness D of the friction material 12 has been measured. For example, the measured thickness D of the friction material 12 may be displayed on the display device 51 . In this case, when the thickness D is displayed on the display device 51, the operator can recognize that the measurement of the thickness has been completed.
  • the frame is captured even if the frame does not satisfy the imaging distance condition. You may make it acquire as image IMG1 for a measurement. Specifically, in the flow of processing shown in FIG. 12, the processing of step S63 may be omitted.
  • the frame is measured even if the frame does not satisfy the imaging angle condition.
  • the image IMG1 may be acquired as the target image IMG1. Specifically, in the flow of processing shown in FIG. 12, the processing of step S61 may be omitted.
  • the in-image marker dimension F6 which is the dimension of the marker MK in the measurement image IMG1
  • the in-image marker dimension F6 should be corrected according to the imaging angle ⁇ .
  • the product of the in-image marker dimension F6 and the aspect ratio ⁇ can be used as the corrected in-image marker dimension F6.
  • the light-emitting part 374 does not have to be a semiconductor laser as long as it can emit parallel light and display the marker MK on the surface of the friction material 12 or on the surface of another member located around the friction material 12 .
  • the imaging unit 375 and the light emitting unit 374 are unitized, but the light emitting unit 374 and the imaging unit 375 may not be unitized.
  • the light emitting unit 374 and the imaging unit 375 may be provided separately in the probe head 373, the light emitting unit 374 may be provided in a separate part from the probe head 373, or a separate part from the probe head 373 may be provided. may be provided with the imaging unit 375 .
  • the imaging distance L is estimated based on the dimensions in the image IMG of the marker MK whose actual dimensions are known, but the imaging distance L may be estimated using the principle of triangulation. Then, the imaging distance L may be estimated based on the time until the reflected light of the laser measurement object is detected, or based on the time until the reflected wave of the ultrasonic wave is detected from the measurement object. The imaging distance L may be estimated.
  • the operator is notified that the imaging angle condition and the imaging distance condition are satisfied using the notification device 53 provided separately from the industrial endoscope 30.
  • notification means other than the notification device 53 may be used to notify the operator.
  • the display screen 311 provided on the main body 31 of the industrial endoscope 30 may display that the imaging angle condition and the imaging distance condition are satisfied.
  • a device for vibrating the main body 31 may be provided in the main body 31 so that the operator can be notified by vibrating the main body 31 that the imaging angle condition and the imaging distance condition are satisfied.
  • the operator is notified that the measurement image IMG1 has been acquired by using the notification device 53 provided separately from the industrial endoscope 30.
  • another notification means may be used to notify the operator.
  • the acquisition of the measurement image IMG1 may be displayed on the display screen 311 provided on the main body 31 of the industrial endoscope 30.
  • a device for vibrating the main body 31 may be provided in the main body 31 so that the operator can be notified by vibrating the main body 31 that the measurement image IMG1 has been obtained.
  • the thickness D of the friction material 12 is displayed on the display device 51 provided separately from the industrial endoscope 30. You may make it alert
  • the thickness D of the friction material 12 may be displayed on the display screen 311 provided on the main body 31 of the industrial endoscope 30 .
  • a device for generating sound may be provided on the main body 31 or separately from the main body 31 so that the thickness D of the friction material 12 is notified to the operator by sound.
  • the measurement device 20 including the industrial endoscope 30, the calculation device 40, the display device 51, and the notification device 53 is illustrated, but the calculation device 40, the display device 51, and the notification device 53 may be integrated into the industrial endoscope 30 .
  • the thickness D of the friction material 12 may be displayed on the display screen 311 .
  • the content of notification to the worker may be displayed on the display screen 311, a speaker may be provided in the industrial endoscope 30, and the content of notification to the worker may be indicated by voice.
  • a lamp may be provided on the mirror 30 to indicate the information to be notified to the operator.
  • a circuit corresponding to the processing circuit 42 may be provided in the industrial endoscope 30 and the thickness D of the friction material 12 may be measured by the circuit.
  • the control program and the thickness D of the friction material 12 may be stored in a wirelessly connected storage device.
  • the measurement image IMG1 is obtained by inserting the imaging unit 375 into the inspection window 11a of the caliper 11 . That is, in the above embodiments, the thickness D of the portion of the friction material 12 exposed through the inspection window 11a is measured.
  • the measurement image IMG1 may be acquired in a state in which the imaging unit 375 is brought close to the friction material 12 from a location other than the inspection window 11a.
  • the measurement image IMG1 may be captured in a state in which the imaging unit 375 is brought closer to the lateral or lower end of the friction material 12 from the side or lower side of the caliper 11 . Thereby, the thickness D of the friction material 12 provided in the caliper without the inspection window can be measured.
  • a measurement image (first measurement image) including the first end of the friction material 12 is taken, and a measurement image (second measurement image) including a second end different from the first end is captured. You can take an image. Accordingly, the degree of uneven wear of the friction material 12 can be estimated by comparing the thickness measured based on the first image for measurement and the thickness measured based on the second image for measurement.
  • the processing circuit 42 includes one or more processors that operate according to a computer program, one or more dedicated hardware circuits such as dedicated hardware that executes at least part of various processes, or a combination thereof. It can be configured as a circuit.
  • Dedicated hardware may include, for example, an ASIC, which is an application specific integrated circuit.
  • the measuring device may be embodied as a measuring device for measuring members other than the friction material 12 .
  • the object to be measured other than the friction material 12 is preferably a member whose size changes as it is used.
  • the measuring device wherein the light emitting unit emits laser light. Since laser light has high directivity, it is possible to accurately measure the size of the object to be measured.
  • a measuring device wherein the beam shape of the laser light emitted by the light emitting unit is circular.
  • the measuring device wherein the imaging section captures the measurement image when the imaging angle estimated by the imaging angle estimating section is a value within the angle range.
  • the imaging unit captures a moving image; The measuring unit converts the frames of the moving image captured by the imaging unit when the imaging angle estimated by the imaging angle estimating unit is a value within the angle range into the measurement image.
  • a measuring device comprising an angle condition reporting unit.
  • the measuring device wherein the imaging unit captures the measurement image when the imaging distance estimated by the imaging distance estimating unit is within the distance range.
  • the imaging unit captures a moving image; The measuring unit converts the frames of the moving image captured by the imaging unit when the imaging distance estimated by the imaging distance estimating unit is a value within the distance range into the measurement image.
  • a measuring device comprising a distance condition reporting unit.
  • the imaging unit is provided in an industrial endoscope, The measuring device, wherein the light emitting unit is provided at a distal end portion of a probe of the industrial endoscope.
  • a measuring method for measuring the size of an object to be measured using the measuring device a marker display step of displaying the marker, which is a light image, on the surface of the object to be measured or an object other than the object to be measured by the light emitting unit; an imaging step of imaging the measurement image including the marker and the measurement object displayed on the surface in the marker display step by the imaging unit; a measuring step of measuring the size of the object to be measured by the measuring unit based on the measurement image captured in the imaging step.
  • the object to be measured is a disc brake friction material
  • a measuring method comprising an insertion step of inserting the imaging unit and the light emitting unit into an inspection window formed in a caliper of the disc brake.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Braking Arrangements (AREA)

Abstract

L'invention concerne un dispositif de mesure 20 comprenant : une unité d'émission de lumière 374 qui émet de la lumière ; une unité de capture d'image 375 qui capture une image de mesure comprenant un objet en cours de mesure et un marqueur, qui est une image de lumière affichée sur une surface de l'objet en cours de mesure ou d'un objet autre que l'objet en cours de mesure, en raison de l'irradiation de l'objet avec de la lumière par l'unité d'émission de lumière 374 ; et un circuit de traitement 42 qui mesure la taille de l'objet en cours de mesure sur la base de l'image de mesure capturée par l'unité de capture d'image 375.
PCT/JP2022/029377 2021-12-02 2022-07-29 Dispositif de mesure WO2023100418A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2021-196177 2021-12-02
JP2021196177A JP2023082417A (ja) 2021-12-02 2021-12-02 測定装置

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WO2023100418A1 true WO2023100418A1 (fr) 2023-06-08

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JP (2) JP2023082417A (fr)
WO (1) WO2023100418A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000018921A (ja) * 1998-07-06 2000-01-21 Hitachi Ltd 寸法測定方法及び装置
JP2002228419A (ja) * 2001-02-05 2002-08-14 Fujikura Ltd 寸法測定装置
JP2005181033A (ja) * 2003-12-18 2005-07-07 Casio Comput Co Ltd カメラ撮影装置およびプログラム
JP2007232684A (ja) * 2006-03-03 2007-09-13 Ntt Comware Corp 計測装置および計測方法並びに計測プログラム

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000018921A (ja) * 1998-07-06 2000-01-21 Hitachi Ltd 寸法測定方法及び装置
JP2002228419A (ja) * 2001-02-05 2002-08-14 Fujikura Ltd 寸法測定装置
JP2005181033A (ja) * 2003-12-18 2005-07-07 Casio Comput Co Ltd カメラ撮影装置およびプログラム
JP2007232684A (ja) * 2006-03-03 2007-09-13 Ntt Comware Corp 計測装置および計測方法並びに計測プログラム

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