Distance measuring device and its measurement method

Abstract

To provide a distributed distance meter that can measure distances from a reference core to surfaces to be measured in both directions easily and stably and accurately and efficiently.SOLUTION: A distributed distance meter comprises: a reference core sensor that measures and outputs a deviation distance in which a reference core is deviated from a central line of a capture area for capturing the reference core; and a pair of distance sensors that detect and output actual measured distances from the central line to surfaces to be measured, and the distributed distance meter corrects the actual measured distances with the deviation distance to output distributed distances. The pair of distance sensors include measuring bars that slidably expand and contract and are flat at ends brought into contact with the surfaces to be measured, and the ends are firmly adhered to the opposite surfaces to be measured to fix the pair of distance sensors to the surfaces to be measured. A base plate including the reference core sensor disposed at the center in a longitudinal direction, the pair of distance sensors extended in both directions, a control part, and a display part is fixed to a device support part, and the control part calculates the distributed distances and displays them on the display part.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a rangefinder and a measurement method thereof. [Background technology]

[0002] In the construction of architectural structures, positioning is often performed by measuring the distribution distance of equal positions from a reference center, and a distribution distance meter suitable for subsequent quality control has been desired. The reference center is often a vertical line, and in that case, dimensional measurement is generally performed by applying a plumb bob or the like to the reference center. In addition, as described in Patent Document 1, a plumb bob position detection device is known as a technology that simplifies the plumb bob position detection process, which has traditionally been time-consuming and laborious, when measuring the displacement of a column, wall, or other object to be measured using a plumb bob string, which is a vertical line, as the reference center in construction work, etc. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2011-247862 A Summary of the Invention [Problem to be solved by the invention]

[0004] The plumb bob position detection device described in Patent Document 1 is designed to measure mainly pillars, wall surfaces, etc., and is therefore difficult to apply when the measurement objects are separated from the reference center. Furthermore, it is not capable of simultaneously measuring the positions of each of the measurement objects placed on either side of the reference center.

[0005] The present invention has been made in consideration of the above-mentioned problems, and its object is to provide a distributing rangefinder that can easily, stably, accurately and efficiently measure the distance from a reference center to a measurement target surface in both directions. [Means for solving the problem]

[0006] The present invention, which achieves the above-mentioned object, is a distributing distance meter that measures the distributing distance to opposing measurement target surfaces in both directions based on a reference core, and is equipped with a reference core sensor that measures and outputs the deviation distance by which the reference core deviates from the center line of a capture area that captures the reference core, and a pair of distance sensors that detect and output the actual measured distance from the center line to the measurement target surface, and outputs the distributing distance by correcting the actual measured distance with the deviation distance. Effect of the Invention

[0007] According to the present invention, it is possible to provide a distributing rangefinder that can easily, stably, accurately and efficiently measure the distance from a reference center to a measurement target surface in both directions. Other problems, configurations and effects will become clear from the description of the following embodiments. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a front view for explaining an overview of a distribution distance measuring method according to a base technology (hereinafter also referred to as "the base technology method"). [Diagram 2] 1 is a top view of a basic type of a dividing rangefinder according to the present invention (hereinafter, also referred to as "the dividing rangefinder"); [Diagram 3] FIG. 3 is a front view of the present distribution rangefinder of FIG. 2. [Figure 4] FIG. 4 is a functional block diagram showing a system configuration of the present distribution rangefinder shown in FIGS. 2 and 3. [Diagram 5] FIG. 5 is a diagram for explaining measurement by the present distribution rangefinder shown in FIGS. 1 to 4. [Figure 6] FIG. 1 is a front view of a distribution rangefinder according to a first modified example (also referred to as the "main distribution rangefinder"). [Figure 7] FIG. 11 is a top view of a distribution rangefinder according to a second modified example (also referred to as the "real distribution rangefinder"). [Figure 8] FIG. 8 is a front view of the present distribution rangefinder of FIG. [Figure 9] FIG. 9 is a vertical cross-sectional view of a beam compressor attached to the present distribution rangefinder shown in FIGS. 7 and 8. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] The present invention will be described below with reference to the drawings. In each drawing, the same components are given the same reference numerals, and if the description is repeated, the description may be omitted. In addition, the various components of the present invention do not necessarily have to be independent of each other, and it is acceptable for one component to be made up of multiple parts, for multiple components to be made up of one part, for one component to be a part of another component, or for a part of one component to overlap with a part of another component.

[0010] [Prerequisite technology] Fig. 1 is a front view for explaining the outline of the method of the base technology. As shown in Fig. 1, a worker 6 brings a measuring device such as a ruler or a tape measure (hereinafter also referred to as "convex, etc.") 3 close to the plumb line, which is a reference core 1 formed by hanging a plumb weight 2 from a plumb bob mounting surface 7 such as a ceiling or a beam, and visually measures the distance between the measurement target surface 5 of a structure 4 and the reference core 1.

[0011] When assembling a structure 4 or device, parts may be attached at predetermined positions to the left and right of a reference axis (often a center line) 1 that serves as a measurement reference. For example, the rails on which the steps of a circulating escalator run and the skirt guard panels installed on both sides of the steps must be precisely attached to predetermined positions to the left and right of the reference axis 1 in the center of the escalator from the standpoint of safety and ride comfort.

[0012] Therefore, the distribution distance W from the reference center 1 to the left and right measurement targets 5 L / W R (Figure 5) needs to be accurately measured. According to the method of the base technology that does not use the distributed distance meter 10, the distance W from the reference center 1 to the right measurement target 5, which will be described later in Figure 5, is L , the distance W from the reference center 1 to the left measurement target 5 R The worker 6 measures the left and right sides while paying considerable attention to each side.

[0013] However, with this method, there are cases where the way the ruler is applied (horizontally and vertically) and the way the scale is read from the swaying plumb bob differs depending on the operator, resulting in variation in the measurement results. Therefore, a basic example of the present distribution distance meter 10 that can improve this problem will be described using Figures 2 to 5.

[0014] [Basic example] Fig. 2 shows a plan view of the present distribution rangefinder 10, and Fig. 3 shows a front view. The present distribution rangefinder 10 is formed by attaching each component to a base plate 107, which is the base of the main body. The components are a reference center sensor 101, a distance sensor 102, an attitude detection unit 103, a control unit 104, a display unit 105, a power supply 106, and a wireless communication unit 112.

[0015] The attitude detection unit 103 is a spirit level, a tilt sensor, or the like, and is intended to allow the user to check the longitudinal levelness of the base plate 107 in the present distribution rangefinder 10. The attitude detection unit 103 is preferably a spirit level that uses the positional relationship between bubbles and liquid filled in a transparent container with a gently inclined center.

[0016] The reference center sensor 101, the control unit 104, and the display unit 105 are disposed in the center of the base plate 107 in the longitudinal direction. The reference center sensor 101 is supported by a reference center sensor bracket 110. A pair of distance sensors 102 are provided extending on both sides of the reference center sensor 101. That is, the distance sensors 102 that detect the distance to the measurement target surface 5 are attached to both ends of the base plate 107 so as to face each other.

[0017] The present distribution rangefinders 10 (FIG. 5) and 12 (FIG. 8) are used with their base plate 107, which is the base of the main body, fixed to a device support unit (a tripod with a pan head) 108. Therefore, the lower part of the base plate 107 is structured so that it can be detached from the device support unit 108. The control unit 104 calculates the distribution distances W L / W Ris calculated according to equations (1) and (2) described later and displayed on the display unit 105.

[0018] The reference core sensor 101 is preferably a CCD transmission type laser sensor or the like, and detects the position where a laser beam is irradiated onto a measurement range (hereinafter also referred to as the "capture area") formed in a specified space in the center, and is blocked by the reference core 1, which is the object to be captured 5, and casts a shadow on the sensor's light receiving surface.

[0019] Further, each of the pair of distance sensors 102 includes a measuring bar 109 that slides and expands and contracts. The ends of the measuring bars 109 that contact the measurement target surface 5 are flat surfaces that can be in contact with the measurement target object 5 in parallel. The flat surfaces are brought into close contact with the opposing measurement target surfaces 5, and the pair of distance sensors 102 are fixed to the measurement target surfaces 5. The distance sensors 102 measure the distance by bringing the ends of the measuring bar 109 into close contact with the left and right measurement target surfaces 5 and bringing the distance sensors 102 into contact perpendicularly with the measurement target surfaces 5.

[0020] Since the reference center 1 is often a vertical line, the user should hold the entirety of the present distribution rangefinder 10 horizontally while referring to the attitude detection unit (level) 103 provided on the base plate 107. In other words, by holding the entirety of the present distribution rangefinder 10, which has a long shape, including the base plate 107 and the pair of distance sensors 102 disposed on both ends thereof, horizontally, the measurement accuracy can be improved.

[0021] The device support unit 108 may be a height-adjustable camera stand, tripod, or the like used to support a camera, etc. This device support unit 108 is easy to use if it is provided with an attitude adjustment mechanism 111 including a camera platform having two or more degrees of freedom.

[0022] The above is the basic configuration of the present distribution rangefinder 10, and this alone is sufficient for practical use. Furthermore, this present distribution rangefinder 10 is equipped with a wireless communication unit 112, so that the measurement results can be wirelessly transmitted to a mobile terminal 113 such as a notebook PC, tablet, or smartphone, enhancing convenience, as shown in Figures 3 and 4.

[0023] Fig. 4 is a functional block diagram showing the system configuration of the present distribution rangefinder 10 shown in Fig. 2 and Fig. 3. As briefly explained in Fig. 3 and also shown in Fig. 4, the present distribution rangefinder 10 includes a control unit 104 including a microcomputer or the like, and a power supply 106. The power supply 106 supplies power to the control unit 104, each sensor, and the wireless communication unit 112.

[0024] The present distribution distance meter 10 uses a reference center sensor 101 and a distance sensor 102 to obtain a distribution distance W L / W R It is preferable to have a wireless communication unit 102a that transmits the data (FIG. 5) to the outside. The present sorting rangefinder 10 is communicably connected to a mobile terminal 113 by a wireless communication unit 102b (collectively 102) located away from the wireless communication unit 102a.

[0025] The microcomputer or the like that constitutes the control unit 104 may be of a one-chip type, and executes a program stored in a non-volatile memory to form a calculation function. The control unit 104 collects data acquired by the reference center sensor 101 and the distance sensor 102, and performs calculation processing.

[0026] The control unit 104 displays the processed data as a measurement result on the display unit 105, and also transmits the same data to the wireless communication unit 112a. The wirelessly transmitted data is received by the wireless communication unit 112b on the recording equipment side and recorded in the mobile terminal 113. The data may also be used to automate or semi-automate the creation of an inspection report, which will be described later.

[0027] The mobile terminal 113 is a device that detects the distribution distance W L / W R By receiving the data, the progress of the inspection work can be displayed for remote monitoring, and it is also convenient in terms of data management. For example, the wireless communication unit 112 (a collective term for 112a and 112b) is a communication function by Wi-Fi, and simply sending the measured data from the sorting rangefinder 10 to a mobile terminal 113 such as a notebook computer via such an interface saves the worker the trouble of writing the data by hand on paper.

[0028] More specifically, in the case of use as a measuring tool for an escalator, the present distribution distance meter 10 may be configured to include the results measured by the measuring tool in a predetermined format of an inspection report. In this manner, the received distribution distance W L / W R By simply automatically entering the above data into the specified fields, an attractive inspection report to be submitted to the quality assurance department, etc. is created. Note that the term "inspection report" is used for convenience of explanation, and includes the corresponding electronic data.

[0029] FIG. 5 is a diagram for explaining the measurement by the present sorting distance meter 10 shown in FIG. 1 to FIG. 4. As shown in FIG. 5, the control unit 104 calculates the distance X between the device center and the reference center obtained by the reference center sensor 101. C and X detected by the left and right distance sensors 102 L and X R Further, the control unit 104 acquires the total width W and the distribution distance W L ,W R In addition to the function of displaying the above on the display unit 105, the device also has a function of recording these data.

[0030] In the control unit 104, the distribution distance W from the reference center 1 L ,W R The left and right are calculated using the following formulas (1) and (2), respectively. Here, X B is the length of the base plate 107 (the distance between the left and right distance sensors 102) and is therefore known. Left side split distance: W L = X L + X B / 2 + X C (1) Right side split distance: W R = X R + X B / 2 - X C ····(2)

[0031] In this way, the present distribution distance meter 10 has a distribution distance W from the reference center 1 to the measurement target surfaces 5 facing each other in both directions. L / W R In order to measure, a reference core sensor 101 and a pair of distance sensors 102 are used. The reference core sensor 101 has a capture area (see also reference numeral 32 in FIG. 2, FIG. 3 and FIG. 9) for capturing the reference core 1, and measures the deviation distance X of the reference core 1 from the center line of the capture area. C Measure and output.

[0032] On the other hand, the pair of distance sensors 102 detects the actual distance X from the center line of the capture area to the measurement target surface 5. L / X R The present distribution distance meter 10 detects and outputs the actual distance X L / X R The deviation distance is X C By correcting with, the distribution distance W L / W R The correction formula is as shown in (1) and (2) above.

[0033] This method of measuring the distribution distance is a distribution distance W from the reference center 1 to the measurement target surface 5 facing in both directions. L / W R This is a method for measuring the distance X of the reference core 1 from the center line of the capture area, and is performed in the following procedure. First, an operator or the like captures the reference core 1 in the capture area of ​​the reference core sensor 101. Next, the reference core sensor 101 measures the deviation distance X of the reference core 1 from the center line of the capture area. C Next, the pair of distance sensors 102 measure and output the actual distance X from the center line to the measurement target surface 5. L / X R Finally, the actual distance X L / X R The deviation distance is X C By correcting with W L / W R Output.

[0034] According to the measurement method using the present distribution distance meter 10, the distance from the reference core to the measurement target surface in both directions can be measured easily, stably, accurately and efficiently, which contributes to shortening the lead time of dimension measurement. In addition, since it does not depend on visual measurement, there is no variation in measurement by operator, which improves the repeatability of measurement.

[0035] This distribution distance meter 10 is suitable as a measuring tool for quality control during installation of an escalator or for periodic inspection after installation. In each application, this distribution distance meter 10 has a reference core 1 as the center of distribution, and measurement target surfaces 5 are placed on both sides of the reference core 1.

[0036] The present distribution distance meter 10 can measure at least any of the distribution distances of frame distribution, rail distribution, panel support distribution, and skirt guard distribution, depending on the difference in the measurement target 5. The present distribution distance meter 10 specialized for such applications is a measuring jig for quality control that has a high effect of improving work efficiency.

[0037] As an application example of this distribution distance meter 10, in the case of a standard-length escalator that spans one floor of a general building, there are approximately 40 points above and below which the uniform distribution distance is measured from the reference center (2 x 20 = 40 points). For this purpose, even if this distribution distance meter 10 is not used, an accuracy of 0.5 mm is required using a tape measure with a minimum scale of 1 mm. Therefore, by using this distribution distance meter 10, the burden on workers and errors can be significantly reduced.

[0038] The distribution distance meter 10, which has been perfected as a measurement tool, is used as follows during installation of an escalator or during regular inspections after installation. For example, an escalator maintenance worker holds the distribution distance meter 10, which is a rod-shaped tool, horizontally, stops at a measurement point, temporarily fixes it, measures, and then moves forward after the measurement, walking intermittently. The maintenance worker only needs to perform this intermittent walking once in one direction of the escalator, and an inspection report (equivalent electronic data) to be submitted to the quality assurance department will be created on a notebook PC (mobile terminal) 113.

[0039] [Variation 1] In the basic example, the device support part 108 of the distribution rangefinder 10 was designed to be a tripod for use with a camera, etc., but depending on the measurement environment, it may be narrow and unable to secure a flat footing within a specified range, making it difficult to set up a tripod.

[0040] Fig. 6 is a front view of the present distributing rangefinder 11 according to the modified example 1. The present distributing rangefinder 11 in Fig. 6 is provided with an attitude adjustment mechanism 111 as the device support part 108, and by changing it to an extension rod 114 that extends and retracts in the horizontal direction, a fixing means can be obtained instead of a tripod. The present distributing rangefinder 11 is structured to support the weight of the distributing rangefinder 10 by pushing the extension rod 114 against the opposing wall or structure surface during measurement.

[0041] [Variation 2] In the basic example of the distribution rangefinder 10, a plumb bob is assumed to be the reference center 1, but depending on the measurement environment, it may be difficult to install a plumb bob. Therefore, a modified example using a laser beam instead of a plumb bob will be described. Figures 7 and 8 show the distribution rangefinder 10 when the laser beam 8 is the reference center 1.

[0042] Fig. 7 is a top view of the present distribution rangefinder 12 according to the modified example 2, and Fig. 8 is a front view thereof. As shown in Fig. 7 and Fig. 8, a laser beam 8 irradiated vertically from a laser plumbing device 9 installed on the floor serves as a reference center.

[0043] As an alternative to this reference center sensor, a laser receiving type reference center sensor 115 may be used to detect the position of the laser light 8. With this sorting rangefinder 12 according to the modified example 2 of Fig. 7, the same measurement principle as with the sorting rangefinder 10 according to the basic example of Figs. 2 to 6 can be realized more simply and accurately.

[0044] In addition, in the present distribution rangefinder 12 of Fig. 7, a spot light position detection element using the surface resistance of a photodiode is assumed as the laser receiving type reference center sensor 115, but the type of sensor is not important as long as it can detect the position of the laser light. Also, since the laser plumb gauge 9 is also available in an upward irradiation type and a downward irradiation type, if it is the downward irradiation type, the laser plumb gauge 9 may be installed above the distribution rangefinder 10, such as on the ceiling.

[0045] In many cases, the reference center 1 is a laser beam 8 that is irradiated vertically from a ceiling or a floor. In that case, the reference center sensor may be a one-dimensional or two-dimensional laser receiving type optical position sensor (PSD: Position Sensitive Detector) 115 that can detect the position of the laser beam 8 and specify the positional relationship with the laser beam 8.

[0046] A beam compressor 20 that can be optionally installed to improve the detection accuracy of the laser light and to improve the detection range of the present distribution rangefinder 12 according to the modified example 2 of Figures 7 and 8 will be described. Figure 9 is a vertical cross-sectional view of the beam compressor 20 that is optionally installed in the present distribution rangefinder 12 of the modified example 2.

[0047] As shown in Fig. 9, if the capture area 32 of the PSD sensor 31, which is a one-dimensional or two-dimensional position detection element, is too narrow and initial alignment to capture the laser light is difficult, this can be improved by optionally equipping the beam compressor 20. That is, when the beam compressor 20 is combined with the convex lens 21 provided on the lens barrel 24 and other components, the light collecting effect of the beam compressor 20 makes it easier to attract the laser light from multiple directions even in the narrow capture area 32.

[0048] Figure 9 is an explanatory diagram of the main parts of the present distributing rangefinder 12 of the modified example 2, combining the lens barrel 24 and the PSD sensor 31. As shown in Figure 9, the present distributing rangefinder 12 has the same measurement principle as the present distributing rangefinders 10, 11 according to the basic example and the modified example 1 of Figures 2 to 8, but is even easier to use.

[0049] The laser receiving device 30 includes a lens barrel 24, an objective lens 21, an image side lens 22, a laser receiving type reference center sensor 31, and an optical filter 23. The lens barrel 24 is cylindrical or has an equivalent function, and is attached to a base plate 107. The objective lens 21 is provided at the lower opening of the lens barrel 24, and may be a convex lens having at least a focal point. The image side lens 22 is disposed within the lens barrel 24, and is located above (behind) the objective lens 21, and guides the laser light 8a from the objective lens 21 to the laser receiving type reference center sensor 31.

[0050] The laser receiving type reference center sensor 31 is disposed in the lens barrel 24, located above (rear of) the image side lens 22, and receives the focused laser light 8b from the image side lens 22. The optical filter 23 is disposed below (in front of) the objective lens 21, forms disturbance light suppression means, and suppresses the transmission of disturbance light other than the laser light 8a.

[0051] The beam compressor 20 constitutes a laser beam converging means by the objective lens 21 and the image-side lens 22. When the vertical laser 8a is installed at a distance and emits light, this laser beam converging means reconverges the laser beam 8a that spreads over a long distance. Therefore, by including the beam compressor 20, the sorting rangefinder 12 according to the second modification of FIG. 9 can improve the detection accuracy and range of the laser beam 8a.

[0052] [supplement] In dimensional measurements using a plumb bob as a reference axis, it was not easy for workers to hold a measuring device such as a convex 3 by hand and keep it horizontal, align the measurement reference with the reference axis 1, and read the scale of the measuring device with high accuracy in a short time. Furthermore, in the measurement of the distribution distance, which is an advanced version of this, workers were forced to face the following difficulties.

[0053] In other words, this work involves a lot of hard work, such as the wasted time and stress of waiting for the vibration to stop, the burden of keeping an eye on the measurement of two locations, from the stationary yarn to the measurement target on both sides, the unnatural working posture required to achieve this, and the effort required to record the acquired measurement data. Therefore, for the worker, repeating this work over and over was hard work that required concentration.

[0054] In addition, it is thought that the tendency for various circumstances such as variation among workers, difficulty in securing skilled workers, and even skilled workers' declining eyesight and concentration due to aging will continue to worsen. In contrast, the plumb bob position detection device of the cited document 1 only solves the problem of detecting the plumb bob position, but does not completely reduce the above-mentioned heavy labor. The present distribution distance meters 10 to 12 can solve these problems. [Explanation of symbols]

[0055] 1...reference center (plumb bob), 2...plumb weight, 3...convex, 4...structure, 5...surface to be measured, 6...operator, 7...plumb bob mounting surface, 8...laser light, 9...laser plumb gauge, 10-12...distribution range finder, 20...beam compressor, 21...convex lens (objective lens), 22...image side lens, 23...optical filter, 24...lens barrel, 30...laser receiving device, 31,115...laser receiving type reference center sensor (PSD ), 32...capture area, 101...reference center sensor, 102...distance sensor, 103...attitude detection unit (level), 104...control unit, 105...display unit, 106...power supply, 107...base plate, 108...device support unit (such as a tripod equipped with an attitude adjustment mechanism (platform) 111), 109...measurement bar, 110...reference sensor bracket, 111...attitude adjustment mechanism (platform), 112...wireless communication unit, 113...mobile terminal, 114...extension rod

Claims

1. A distribution distance meter that measures distribution distances to measurement target surfaces facing each other in both directions based on a reference center, a reference core sensor that measures and outputs a deviation distance of the reference core from a center line of a capture area that captures the reference core; a pair of distance sensors that detect and output an actual distance from the center line to the measurement target surface; Equipped with outputting the allocated distance by correcting the actual measured distance with the deviation distance; Distance measuring device.

2. The pair of distance sensors each include a measuring bar that slides and expands and contracts, and an end of the measuring bar that contacts the measurement target surface has a flat surface that can be in contact with the measurement target in parallel, and the flat surfaces are brought into close contact with the opposing measurement target surfaces, respectively, to fix the pair of distance sensors to the measurement target surface.

2. The rangefinder according to claim 1.

3. a base plate including the reference center sensor disposed at the center in the longitudinal direction, the pair of distance sensors extending in both directions, a control unit, and a display unit, the base plate being fixed to an apparatus support unit; The control unit calculates the distribution distance and displays it on the display unit.

3. The rangefinder according to claim 2.

4. The device support part is provided with an attitude adjustment mechanism.

4. The rangefinder according to claim 3.

5. The reference axis is a vertical line, The base plate includes an attitude detection unit that assists in maintaining the entire horizontal position including the pair of distance sensors disposed at both ends.

4. The rangefinder according to claim 3.

6. a wireless communication unit that transmits data of the reference center sensor and the sorting distance acquired by the distance sensor to an external device; 2. The rangefinder according to claim 1.

7. The device support part has an extensible rod that expands and contracts in the horizontal direction, and is held in a state in which the opposing measurement target surface or a corresponding wall surface is elastically pressed by the extensible rod.

4. The rangefinder according to claim 3.

8. The reference center is a laser beam that is irradiated vertically from a ceiling or a floor, The reference center sensor is a one-dimensional or two-dimensional laser receiving type optical position sensor capable of detecting the position of the laser light and specifying a positional relationship with the laser light.

2. The rangefinder according to claim 1.

9. the optical position sensor is fitted with a beam compressor in a capture region; The beam compressor includes at least an objective lens having a focal point disposed in a lens barrel.

9. The rangefinder according to claim 8.

10. As a measuring tool for quality control during installation of an escalator or during periodic inspections after installation, The reference core is the center of distribution, and the measurement target surfaces face each other on both sides of the reference core, Depending on the difference in the measurement target surface, it is possible to measure at least any one of the distribution distances of the frame distribution, the rail distribution, the panel support distribution, and the skirt guard distribution. The sorting rangefinder according to any one of claims 1 to 9.

11. The results measured by the measuring tool are formed into a predetermined inspection report format.

11. The rangefinder according to claim 10.

12. A method for measuring a distribution distance to a measurement target surface facing in both directions based on a reference center, comprising: Capturing the reference core in a capture area of ​​a reference core sensor; the reference center sensor measures and outputs a deviation distance of the reference center from a center line of the capture area; A pair of distance sensors detects and outputs an actual distance from the center line to the measurement target surface; outputting the allocated distance by correcting the actual measured distance with the deviation distance; Distance measurement method.

Images