Jig, measuring device, and method for aligning the measuring device

Abstract

The aim is to enable the installation of a measuring device with imaging capabilities with high precision and ease, while keeping overall manufacturing costs down. [Solution] The jig 20 is a jig for mounting a measuring device equipped with an imaging unit for imaging a predetermined stationary structure in an elevator shaft to a moving body that moves along an elevator shaft, and when mounting the measuring device to the moving body, the jig includes a first contact portion that contacts a first surface of the stationary structure and a second contact portion that contacts a second surface of the stationary structure different from the first surface, and further includes an alignment portion that allows the jig to be positioned so that the surface including the first contact portion and the light-receiving surface of the imaging unit are substantially parallel when mounted to the measuring device.

Description

Technical Field

[0001] The present invention relates to a jig, a measuring device, and a method for aligning the position of a measuring device, and is suitable for application to a jig used for installing a measuring device provided with imaging means on a moving body, a measuring device having the jig, and a method for aligning the position of the measuring device.

Background Art

[0002] Conventionally, in an elevator having a car (hereinafter also referred to as an "elevator car" or "car") as a moving body, a governor rope has been used as a safety device for monitoring the position, speed, etc. of the elevator car. In recent years, as a device to replace the governor rope, a measuring device that non-contact measures the position and speed of an elevator car by a non-contact sensor (position and speed sensor) is known.

[0003] For example, in Patent Document 1, an image sensor is installed on a car as a non-contact position and speed sensor, and a structure existing in a hoistway is photographed by this image sensor, and an optical measuring device that measures the position and speed of the car from the time difference of the captured images is disclosed. The non-contact measuring device disclosed in Patent Document 1 has an effect of improving the installability and maintainability because a long structure such as a governor rope is not required, and also has an effect of not generating a measurement error due to slippage.

[0004] Also, in Patent Document 2, for an image obtained by irradiating and imaging a stationary structure (for example, a guide rail), by calculating the translational error and rotational error in an image processing unit, it is determined whether the mounting position of the measuring device on the moving body conforms to the designed installation position, and a measuring device that presents information related to the determination to an operator is disclosed.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

[0006] In order to obtain sufficient performance with the measuring device described in Patent Document 1, it is necessary to measure the relative distance and angle with respect to the guide rail when installing it on the cage, and to mount the measuring device with high installation accuracy. However, in order to obtain sufficient installation accuracy with known measuring devices, dedicated measuring instruments such as rulers and spirit levels are required in addition to the measuring device itself, and the installation accuracy is also affected by the skill level of the operator in measuring techniques. Furthermore, when using a spirit level, the machining and assembly accuracy of the mounting surface of the measuring device on which the spirit level is placed also affects the installation accuracy. In addition, it was important to shorten the installation time in order to reduce the workload.

[0007] Furthermore, in the case of the measuring device described in Patent Document 2, it is necessary to provide a highly accurate image processing unit and an instruction unit for displaying information to the operator, which presented the challenge of increasing the overall manufacturing cost of the measuring device.

[0008] This invention was made in consideration of the above points, and aims to propose a jig, a measuring device, and a method for aligning a measuring device that has an imaging means, which enable high-precision and easy installation of the measuring device while suppressing overall manufacturing costs. [Means for solving the problem]

[0009] To solve the above problems, the present invention provides a jig for mounting a measuring device equipped with an imaging unit for imaging a predetermined stationary structure in an elevator shaft to a moving body that moves in the elevator shaft, wherein the jig comprises, when the measuring device is mounted on the moving body, a first contact portion that contacts the stationary structure when mounted on the measuring device, a first contact portion that contacts a first surface of the stationary structure, and a second contact portion that contacts a second surface of the stationary structure different from the first surface, and further comprising an alignment portion that allows the jig to be positioned so that the surface including the first contact portion and the light-receiving surface of the imaging unit are substantially parallel when mounted on the measuring device.

[0010] Furthermore, in order to solve the above problems, the present invention provides a measuring device that is attached to a moving body moving in an elevator shaft using a jig to measure the distance or speed of the moving body, comprising: an imaging unit that images a stationary structure arranged along the direction of movement of the moving body in the elevator shaft; a calculation unit that calculates the distance or speed of the moving body based on the imaging results from the imaging unit; and a jig that can be attached to and detached from the measuring device, and which is used for alignment when the measuring device is attached to the moving body, wherein the jig has a contact portion that comes into contact with the stationary structure when attached to the measuring device, and A measuring device is provided, comprising: a first contact portion that contacts a first surface on the stationary structure; and a second contact portion that contacts a second surface different from the first surface on the stationary structure, wherein the jig further comprises an alignment portion that allows for alignment such that the surface including the first contact portion and the light-receiving surface of the imaging unit are substantially parallel when the jig is attached to the measuring device, the measuring device has at least two fixed points within the alignment surface on which the imaging unit is placed, and the alignment portion has a structure that allows for alignment at the at least two fixed points such that the bottom surface of the jig and the alignment surface are substantially parallel when the jig is attached to the measuring device.

[0011] Furthermore, in order to solve the above problems, the present invention provides a method for aligning a measuring device for mounting the measuring device on a moving body that moves along an elevator shaft using a jig, wherein the measuring device has an imaging unit for imaging a predetermined stationary structure in the elevator shaft, and the jig has a contact portion that comes into contact with the stationary structure when attached to the measuring device, a first contact portion that comes into contact with a first surface of the stationary structure, and a second contact portion that comes into contact with a second surface of the stationary structure that is different from the first surface. A method for aligning a measuring device is provided, comprising: a first step of placing the measuring device on a fixed part provided on the upper part of the moving body; a second step of attaching the jig to the measuring device such that the first contact part of the jig contacts the first surface of the stationary structure and the second contact part of the jig contacts the second surface of the stationary structure; and a third step of aligning the jig so that the surface including the first contact part and the light-receiving surface of the imaging unit are substantially parallel. [Effects of the Invention]

[0012] According to the present invention, a measuring device having an imaging means can be installed with high precision and in a simple manner while suppressing the overall manufacturing cost. [Brief explanation of the drawing]

[0013] [Figure 1] This figure shows an example configuration of an elevator system 10 including a jig 20 according to the first embodiment of the present invention. [Figure 2] This is an overhead view showing the positional relationship between the jig 20, the measuring device 11, and the stationary structure (guide rail 103) when the measuring device 11 is mounted on the bracket 21. [Figure 3] This is an example of a top view of the metal plate 23. [Figure 4] This diagram illustrates the adjustment of the elevation and depression angles using the laminated member 24. [Figure 5] This flowchart shows an example of the work procedure for installing the measuring device 11. [Figure 6]The figure for explaining the positional relationship between the jig 20 and the imaging unit 110 of the measuring device 11 when the jig 20 is attached to the measuring device 11. [Figure 7] It is a plan view showing the positional relationship between the first surface P202 and the second surface P203 of the jig 20 and the imaging element 112 of the measuring device 11. [Figure 8] It is a top view for explaining the imaging field of view 71 of the imaging unit 110. [Figure 9] It is a top view for explaining the in-plane rotational error of the jig 20 with respect to the measuring device 11. [Figure 10] It is a conceptual diagram for calculating the in-plane rotational error of the jig 20 with respect to the measuring device 11. [Figure 11] It is a plan view showing the positional relationship between the jig 25 according to the second embodiment of the present invention and a stationary structure or the like. [Figure 12] It is a plan view of the jig 26 according to the third embodiment of the present invention. [Figure 13] It is a top view of the jig 26. [Figure 14] It is a plan view of the jig 27 according to the fourth embodiment of the present invention. [Figure 15] It is a plan view of the jig 28 according to the fourth embodiment of the present invention.

Mode for Carrying Out the Invention

[0014] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0015] In each embodiment of the present invention described in detail below, a measuring device that measures information (such as position, moving distance, speed, or acceleration) related to the movement of a moving body at high speed and with high accuracy using a measuring unit having an imaging function is used by an operator using a jig to align it with a reference stationary structure at an appropriate distance and angle and install it at a predetermined installation position. The technology will be described.

[0016] In each embodiment of the present invention described in detail below, the measuring device is placed at a predetermined installation position on an elevator car, which is a moving object, and measures information relating to the movement of the elevator car along a path (movement path) that guides the elevator car (specifically, at least one of the elevator car's position (distance traveled), speed, acceleration, or vibration). The measuring device comprises a measuring unit (illumination unit, imaging unit, and imaging unit) that moves together with the moving object and images a stationary structure described later as the subject, a calculation unit that uses the imaging results from the measuring unit to calculate information relating to the movement of the moving object (position, distance traveled, speed, or acceleration, etc.) at high speed and with high accuracy, and an output unit that outputs the calculation results (measurement results) from the calculation unit to the outside.

[0017] To explain in more detail, for example, in a measuring device, the irradiation unit of the measuring unit irradiates (transmits) light from the moving body toward the surface of a stationary structure (for example, a guide rail or a wall surface within a moving path) that may be subject to artificial polishing scratches. The measuring unit then directs the light reflected from the surface of the stationary structure (light that may include specular reflection and diffuse reflection, hereinafter referred to as "scattered light") into the imaging surface of the imaging unit via the imaging unit, and the imaging unit photoelectrically converts the optical signal into an electrical signal.

[0018] Next, in the measuring device, the calculation unit calculates (measures) information related to the movement of the elevator car based on the image generated from the electrical signal converted by the imaging unit. Then, the output unit transmits the information related to the movement of the elevator car calculated by the calculation unit to the elevator car control unit (moving unit control unit). The elevator car control unit (moving unit control unit) controls the operation of the elevator car and safety devices based on the received information related to the movement of the elevator car.

[0019] In this specification, "light" refers to electromagnetic waves, and specifically may include visible light, microwaves, terahertz waves, infrared rays, ultraviolet rays, X-rays, and any other type of light.

[0020] Furthermore, in the following explanation, when describing similar elements without distinction, the common part of the reference code including the sub-number (the part excluding the sub-number) may be used, and when describing similar elements with distinction, the reference code including the sub-number may be used. For example, when describing similar measuring devices without particular distinction, "measuring device 11" is used, but when describing individual measuring devices 11 with distinction, they may be described as "measuring device 11-1", "measuring device 11-2", etc.

[0021] (1) First Embodiment (1-1) Configuration of elevator system 10 Figure 1 is a diagram showing an example configuration of an elevator system 10 including a jig 20 according to the first embodiment of the present invention. The first embodiment is an embodiment that shows concepts common to each embodiment of the present invention, and in the description of the other embodiments (second to fourth embodiments) described later, detailed descriptions of components common to the first embodiment may be omitted. In the drawings shown below, hypothetical planes and axes for explaining arrangement relationships are shown with dotted lines, optical paths are shown with dashed lines with arrows, and electrical signal paths are shown with solid lines with arrows.

[0022] As shown in Figure 1, the elevator system 10 includes measuring devices 11 (individually measuring devices 11-1, 11-2) mounted on top of the elevator car 101 that moves up and down within the hoistway (movement path of the moving object) of a building (not shown). In addition to the measuring devices 11, the elevator system 10 also includes components such as the elevator car 101, elevator control unit 102, guide rails 103 (individually guide rails 103-1, 103-2), and brackets 21 (individually brackets 21-1, 21-2), but at least one of these components may be included in the measuring device 11.

[0023] The measuring device 11 outputs signal information useful for controlling the operation of the elevator car 101 (for example, signal information related to the position, speed, or acceleration of the elevator car 101) to the elevator control unit 102. The location of the measuring device 11 is not limited to the top of the elevator car 101, but may be located on the side or bottom of the elevator car 101, for example. The measuring device 11 shown in Figure 1 is configured to be redundant by duplicating measuring devices 11-1 and 11-2, but the configuration of the measuring device 11 according to this embodiment is not limited to such a redundant configuration, and may be a single-system configuration without redundancy, or a triple-redundant or higher-redundancy configuration.

[0024] The elevator control unit 102 uses the signal information output from the measuring device 11 to control the operation of the elevator car 101 and the safety devices, etc.

[0025] The guide rail 103 is an example of a stationary structure that serves as a reference when measuring the relative distance and angle of the measuring device 11, which moves together with the moving body (elevator car 101), and is located within the hoistway. The guide rail 103 is located within the hoistway along the direction of movement of the moving body (elevator car 101) (y-axis direction in Figure 1), and contacts the guide rollers or guide shoes of the elevator car 101 to support the movement of the moving body.

[0026] The bracket 21 is fixed to the elevator car 101 and is a structure for fixing the measuring device 11 to the elevator car 101. The measuring device 11 can be directly installed on the elevator car 101 without using the bracket 21, but by using the bracket 21 at the installation site of the measuring device 11, it becomes easier to install the measuring device 11 on the elevator car 101 with accuracy.

[0027] In the following explanation, a coordinate system based on the guide rail 103 is used to indicate the position of the measuring device 11. Specifically, as shown in Figure 1, the coordinate system is defined as follows: the direction of movement of the moving body is the y-axis direction; the direction perpendicular to the surface observed by the measuring device 11 on the stationary structure (in Figure 1, the top surface of the convex part of the guide rail 103) is the z-axis direction; and the direction perpendicular to both the y-axis and the z-axis is the x-axis direction. Unless otherwise specified, the notations x-direction, y-direction, and z-direction can be considered synonymous with x-axis direction, y-axis direction, and z-axis direction.

[0028] (1-2) Installation procedure using jig 20 Referring to Figures 2 to 4, the method of mounting the measuring device 11 onto the bracket 21 using the jig 20 will be explained.

[0029] Figure 2 is an overhead view showing the positional relationship between the jig 20, the measuring device 11, and the stationary structure (guide rail 103) when the measuring device 11 is installed on the bracket 21. The measuring device 11 is placed on the bracket 21 fixed to the elevator car 101 and fastened with bolts 22 (individually, bolts 22-1 and 22-2). The measuring device 11 is also fastened with bolts 22 similar to bolts 22-1 and 22-2 on the rear side, which is not shown in Figure 2. In other words, as an example, the measuring device 11 is fastened to the bracket 21 at all four corners with bolts 22.

[0030] Furthermore, when fastening with bolts 22, a laminated member 24 (individually, laminated members 24-1, 24-2) made of one or more metal plates 23 may be sandwiched between the bolts 22 and the bracket 21. As will be described later, the tilt of the measuring device 11 can be adjusted by installing the laminated member 24. Similar to the bolts 22 described above, the laminated member 24 can also be placed on the rear side of the measuring device 11, which is not shown in Figure 2, and as a result, the laminated member 24 is installed below the four corners of the measuring device 11 that are fastened with bolts 22. In Figure 2, the laminated members 24-1 and 24-2 are each constructed by stacking three metal plates 23. However, the number of metal plates 23 constituting the laminated member 24 is not limited to three. As will be described later, the number of plates changes according to the angle of the measuring device 11 relative to the bracket 21 (that is, the number of metal plates 23 constituting the laminated member 24 is arbitrary for each installation location. For example, there may be locations where the number of metal plates 23 constituting the laminated member 24 is 0 (i.e., the laminated member 24 is not installed)).

[0031] As will be described in detail in (1-3-2), the jig 20 is fixed to the measuring device 11 at the alignment section 201. The jig 20 may be fixed using, for example, screws 207, or a protrusion (dowel) may be provided on either the measuring device 11 or the jig 20, and a recess may be provided on the other, and the protrusion and recess may be fitted together.

[0032] When aligning the measuring device 11, two or more surfaces of the jig 20 fixed to the measuring device 11 are brought into contact with the stationary structure (guide rail 103). In Figure 2, two different surfaces of the jig 20 are brought into contact with the guide rail 103. By aligning these two contact surfaces, a total of five degrees of freedom are determined for the measuring device 11 and the jig 20, consisting of their position in the xz plane with respect to the guide rail 103 (two degrees of freedom: x translation and z translation), the azimuth angle, and two elevation angles (excluding y translation, which is the direction of movement of the moving body). In this state, the measuring device 11 and the jig 20 are translated along the guide rail 103 towards the bracket 21. Note that, as shown in the fourth embodiment of the present invention, the contact between the jig 20 and the stationary structure (guide rail 103) does not necessarily have to be surface contact; it is also possible to provide a projection on the jig 20 and make point contact by bringing the projection into contact with the stationary structure.

[0033] Furthermore, because the elevator car 101 is subject to distance variations within the installation tolerances relative to the guide rail 103, the centers of the holes through which the bolts 22 pass in the measuring device 11 and the bracket 21 do not necessarily coincide. Also, because there is inclination within the installation tolerances, the upper surface of the bracket 21 is not necessarily parallel to the xz plane defined by the guide rail 103. Therefore, when the measuring device 11 is placed on the bracket 21, the bottom surface of the measuring device 11 and the upper surface of the bracket 21 do not necessarily coincide.

[0034] The measuring device 11 is installed by adjusting the position and azimuth angle of the measuring device 11 relative to the bracket 21, which occurs when the position and angle of the measuring device 11 are aligned with the guide rail 103 as a reference. The adjustment of the position and azimuth angle can be performed, for example, by utilizing the tolerance of the diameter of the through hole through which the bolt 22 passes (in other words, the tolerance of the difference (tightening allowance) between the shaft diameter of the bolt 22 and the diameter of the through hole). Specifically, for example, by making the diameter of the through hole through which the bolt 22 passes in the measuring device 11 or the bracket 21 larger than the distance variation that may occur in the elevator car 101 relative to the shaft diameter of the bolt 22, it becomes possible to perform alignment by adjusting the position and azimuth angle to absorb the distance variation. Alternatively, the through hole provided in the measuring device 11 and the bracket 21 may be made into an elongated shape, and its longitudinal direction may be set perpendicular to the measuring device 11 and the bracket 21, and position adjustment may be performed.

[0035] Next, the elevation and depression angles can be adjusted, for example, by stacking multiple metal plates 23 to form a stack of metal plates (laminated member 24) and sandwiching it between the bottom surface of the measuring device 11 and the top surface of the bracket 21. The laminated members 24 are positioned below the four corners of the measuring device 11, and by adjusting the number of metal plates 23 in the laminated members 24 positioned at each of the four corners according to the gap between the bottom surface of the measuring device 11 and the top surface of the bracket 21, it is possible to adjust the difference in elevation and depression angles between the bottom surface of the measuring device 11 and the top surface of the bracket 21. The metal plates 23 are, for example, so-called liners (liner plates) and are positioned near the bolts 22 as shown in Figure 3. Although the material of the metal plates 23 is described as "metal" for explanatory purposes, they may also be made of resin, as long as they are plates that are sandwiched and fixed between the bottom surface of the measuring device 11 and the top surface of the bracket 21.

[0036] Figure 3 is an example of a top view of the metal plate 23. The metal plate 23 illustrated in Figure 3 is a sheet metal with a rectangular shape (so-called U-shape) in which a recess is formed in part of the rectangle so that the bolt 22 (more precisely, the underside of the bolt 22) does not overlap. In other words, the metal plate 23 is installed between the head of the bolt 22 (which may be interpreted as the bottom surface of the measuring device 11) and the bracket 21 so that the bolt 22 passes through the center of the recess in the metal plate 23. In the example in Figure 3, the head of the bolt 22, shown by the dashed line, is smaller in size than the recess in the metal plate 23, but at least the diameter of the underside of the bolt 22 must be smaller than the recess in the metal plate 23, and the head of the bolt 22 may be larger than the recess.

[0037] Here, it is preferable that the thickness of each metal plate 23 is selected to be less than the product of the spacing between the installation positions of the metal plates 23 and the tangent of the required resolution for angle adjustment. That is, when the spacing between the installation positions of the metal plates 23 is d1 and the required resolution for angle adjustment is θ, the thickness d2 of the metal plate 23 is selected to be less than d1 × tanθ (d2 ≤ d1 × tanθ).

[0038] Figure 4 is a diagram illustrating the adjustment of the elevation and depression angles using the laminated members 24. Figure 4 shows that when fixing the measuring device 11 to the bracket 21, in a situation where the bottom plates 118 provided on both sides of the measuring device 11 and the upper surface of the bracket 21 are not parallel (i.e., a situation where adjustment of the elevation and depression angles in the y direction is necessary), the elevation and depression angles in the y direction of the measuring device 11 (bottom plate 118) can be adjusted in the xyz coordinate system space relative to the stationary structure (guide rail 103) by adjusting the number of metal plates 23 that make up the two laminated members 24.

[0039] Specifically, as shown in Figure 4, if the number of metal plates 23 differs by only one between laminated members 24-1 and 24-2 separated by a distance d1, the tilt of the elevation angle of the bracket 21 will be "atan(d2 / d1)". By selecting the thickness d2 of the metal plates 23 such that this tilt is below the required resolution θ for angle adjustment, the tilt of the elevation angle can be adjusted with a finer precision than the required resolution θ by adjusting the number of metal plates 23, thereby adjusting the elevation angle in the y direction of the measuring device 11 (bottom plate 118). In other words, it is required that the relationship "atan(d2 / d1)≦θ" be satisfied, and rearranging this relationship gives "d2≦d1×tanθ".

[0040] Figure 5 is a flowchart showing an example of the installation procedure for the measuring device 11. The installation procedure shown in Figure 5 is performed by an operator using a jig 20. The guide rail 103 shown in this example procedure is an example of a stationary structure.

[0041] As shown in Figure 5, the worker first attaches the jig 20 to the measuring device 11 (step S101). In this attachment, the jig 20 is fixed to the measuring device 11 at the alignment section 201 using the aforementioned screw 207 and interlocking structures. Note that the jig 20 may be fixed when it is installed on the bracket 21, or it may be fixed in advance at the manufacturing site before the measuring device 11 is shipped for installation.

[0042] Next, the worker brings the jig 20 into contact with the guide rail 103 such that the front surface of the guide rail 103 and the first surface P202 of the jig 20 face each other, and the rear surface of the guide rail 103 and the second surface P203 of the jig 20 face each other (step S102). More specifically, the worker performs step S102 on the elevator car 101, holding the measuring device 11 and the jig 20, and brings two predetermined surfaces of the jig 20 (first surface P202, second surface P203) into contact with two predetermined surfaces of the guide rail 103 (front and rear). The first surface P202 and the second surface P203 of the jig 20 are also shown in Figures 6 and 7, which will be described later.

[0043] Furthermore, after completing step S102, the worker visually confirms that the jig 20 and the guide rail 103 are in contact. Alternatively, the worker may objectively confirm that the jig 20 and the guide rail 103 are in contact using electrical or magnetic methods. For example, if both the jig 20 and the guide rail 103 are made of metal, the electrical conductivity achieved by contact can be confirmed by a reaction such as an LED or buzzer.

[0044] Next, the worker places the measuring device 11 on the bracket 21 with the jig 20 in contact with the guide rail 103 (step S103). More specifically, the worker slides the measuring device 11 and the jig 20 towards the bracket 21 along the guide rail 103, and places the measuring device 11 on the bracket 21 while maintaining the state in which the guide rail 103 and the jig 20 are in contact with each other on the two surfaces described above.

[0045] Following step S103, the worker inserts a laminated member 24, consisting of one or more metal plates 23 stacked on top of each other, into the gap between the bracket 21 and the measuring device 11 to adjust the elevation angle of the measuring device 11 (step S104). More specifically, the worker inserts the metal plates 23 into the gaps between the top surface of the bracket 21 and the bottom surface of the measuring device 11, corresponding to each of the four corners of the measuring device 11, adjusting the number of plates according to the width of each gap. At this time, the jig 20 is maintained in contact with the guide rail 103.

[0046] After step S104, the measuring device 11 and the bracket 21 are secured with bolts 22 (step S105). Specifically, the worker inserts bolts 22 from above into each of the through holes in the measuring device 11, and also into the through holes in the bracket 21, and then tightens the bolts 22 from below the bracket 21, thereby fastening the measuring device 11 and the bracket 21 with the laminated member 24 sandwiched between them.

[0047] Finally, the worker removes the jig 20 from the measuring device 11, completing the installation of the measuring device 11 (step S106). Specifically, the worker removes the fixing materials such as screws 207 that were used to fix the measuring device 11 in the alignment section 201 in step S101, and slides the jig 20 upward to remove it.

[0048] (1-3) Shape of jig 20 (1-3-1) Structure of the jig 20 for stationary structures Referring to Figures 6 to 8, the structure of the jig 20, focusing on the part that contacts the stationary structure (guide rail 103), will be explained.

[0049] Figure 6 is a diagram illustrating the positional relationship between the jig 20 and the imaging unit 110 of the measuring device 11 when the jig 20 is attached to the measuring device 11. The jig 20 and measuring device 11 shown in Figure 6 are viewed from above, and the top surface of the measuring device 11 is removed in order to clearly explain the internal structure of the measuring device 11 (e.g., the imaging unit 110).

[0050] As shown in Figure 6, the measuring device 11 includes an imaging unit 110. The imaging unit 110 is composed of an image sensor 112, a lens barrel 113, an imaging element 114, and an imaging substrate 115. For the sake of simplicity, Figure 6 shows the imaging element 114 (imaging unit) as a single lens, but the imaging element 114 (imaging unit) of the imaging unit 110 may be composed of a combination of multiple lenses, or a reflective imaging optical element such as a concave mirror may be used instead of a lens.

[0051] Although not shown in Figure 6, etc., the measuring device 11 includes an illumination unit that irradiates light toward the surface of the stationary structure (guide rail 103) for the imaging unit 110 to take an image. The illumination unit only needs to be configured such that the scattered light emitted from the illumination unit toward the surface of the stationary structure is incident on the imaging surface via the imaging unit (imaging element 114), and details such as the arrangement and direction of illumination are omitted from the explanation.

[0052] Furthermore, in the measuring device 11, a window portion 119 is provided on the surface facing the stationary structure (guide rail 103) as an opening to secure an optical path for the imaging unit 110 to take images (specifically, an optical path for capturing scattered light from the light irradiated from the illumination unit toward the surface of the stationary structure). The window portion 119 may be a simple opening, but in order to prevent dust and other contaminants from entering the interior, the opening may be covered with a translucent plate-like member that does not easily affect imaging by the imaging unit 110. In addition, whether the above-mentioned plate-like member is included or it is a simple opening, the window portion 119 provided on the front surface of the measuring device 11 (the surface facing the guide rail 103) may be formed so as to not protrude forward (towards the guide rail 103) when compared to the surrounding surface of the window portion 119, as shown in Figure 6, for example.

[0053] Furthermore, the through holes 116 (through holes 116-1 to 116-4) shown in Figure 6 are through holes formed at predetermined locations (each of the four corners) on the bottom surface of the measuring device 11, and as described above with reference to Figure 2, these are through holes into which the bolts 22 are inserted.

[0054] In Figure 6, as described above, the surface of the jig 20 that abuts against the front surface (top surface of the protrusion) of the guide rail 103 is designated as the first surface P202, and the surface of the jig 20 that abuts against the side surface (side surface of the protrusion) of the guide rail 103 is designated as the second surface P203. Also in Figure 6, the light-receiving surface of the image sensor 112 is designated as the light-receiving surface P111, and the path of the scattered light rays from the guide rail 103 that originate from the center of the imaging field of view within the measuring device 11 is designated as the light ray path R50. In this embodiment, when the jig 20 is attached to the measuring device 11, the light-receiving surface P111 and the first surface P202 are made parallel (or nearly parallel).

[0055] In this specification, when it is stated that "two planes are parallel" or "a plane and a line are parallel," the "two planes" or "plane and line" that form a parallel relationship do not necessarily mean that they are perfectly parallel (i.e., they never intersect even if extended infinitely), but rather that they include a relationship in which there is a predetermined allowable angle of inclination between them. When expressing this relationship strictly, including such an allowable angle of inclination, it can be expressed as "approximately parallel." For example, the required installation accuracy for the elevation and depression angles when the measuring device 11 is placed on the elevator car 101 is considered to be within the "allowable range."

[0056] In this embodiment, the measuring device 11 is arranged such that the light-receiving surface P111 and the first surface P202 are optically conjugate, as shown in the light ray path R50 in Figure 6, by the imaging element 114. With this arrangement, after the measuring device 11 is installed, the front surface (top surface of the convex part) of the guide rail 103 is in focus, so that the image sensor 112 can output a focused image.

[0057] Figure 7 is an overhead view showing the positional relationship between the first surface P202 and the second surface P203 of the jig 20 and the image sensor 112 of the measuring device 11. The first surface P202 and the second surface P203 shown in Figure 7 are planes in space that extend the regions of the physical surfaces (regions that actually exist as surfaces) of the jig 20. In Figure 7, the region of the first surface P202 that is physically present in the jig 20 (regions that actually exist as surfaces of the jig 20) is designated as region P204, and the region of the second surface P203 that is physically present in the jig 20 (regions that actually exist as surfaces of the jig 20) is designated as region P205. Also in Figure 7, one direction among the arrangement of photoelectric conversion elements (pixel arrangement) in the image sensor 112 is designated as direction A60.

[0058] In this embodiment, the measuring device 11 is provided with a second surface P203 such that the second surface P203 is parallel (or nearly parallel) to direction A60. By providing such a second surface P203, the measuring device 11 can be positioned so that the direction in which the guide rail 103 guides the moving body (elevator car 101) is parallel to the direction A60 of the pixel arrangement. As a result, when the elevator car 101 moves, the direction in which the captured image in the measuring device 11 shifts can always be limited to a certain direction (more specifically, one direction of the pixel arrangement), which can be expected to improve the accuracy and reduce the load of image matching processing (processing that performs pattern matching between time-series captured images, etc.).

[0059] Figure 8 is a top view illustrating the imaging field of view 71 of the imaging unit 110. In Figure 8, the path of the scattered light rays from the guide rail 103 that are scattered at the edge of the imaging field of view 71 is defined as the light ray path R70.

[0060] As shown in Figure 8, in this embodiment, the jig 20 is positioned relative to the measuring device 11 such that the second surface P203 of the jig is located outside the imaging field of view 71 (in other words, the second surface P203 does not overlap the imaging field of view 71). With this positioning, when the jig 20 is brought into contact with the guide rail 103 and the measuring device 11 is installed, the measuring device 11 can be placed so that the top surface of the guide rail 103 is within the imaging field of view 71 of the imaging unit 110. As a result, the guide rail 103 is always included in the image captured by the measuring device 11, and the position and speed can be measured by the measuring device 11 with high accuracy.

[0061] In the description of this embodiment above (Figures 2, 6 to 8), the second surface P203 of the jig 20 is provided so as to face the right surface of the stationary structure (guide rail 103) (the surface on the positive x-axis side of the two sides). However, this embodiment is not limited to this, and the second surface P203 may also be provided so as to face the left surface of the guide rail 103 (the surface on the negative x-axis side of the two sides).

[0062] (1-3-2) Components of the jig 20 used for alignment with the measuring device 11 This section describes the components of the jig 20, which is centered on the part that contacts the measuring device 11, that are used for alignment with the measuring device 11.

[0063] As explained with reference to Figure 5, in step S101 of the installation work for the measuring device 11, the worker attaches the jig 20 to the measuring device 11. At this time, when the jig 20 is properly aligned and attached to the measuring device 11, a predetermined portion of its bottom surface contacts a predetermined portion of the upper surface of the bottom plate of the measuring device 11 (in this embodiment, the bottom plates 118 provided on both sides of the measuring device 11). When the predetermined portion of the surface that contacts the jig 20 and the measuring device 11 in this way is called the "alignment surface," it can be said that the jig 20 and the measuring device 11 share at least one alignment surface. The alignment portion 201 of the jig 20 according to this embodiment is configured to include a predetermined portion of the bottom surface on the jig 20 side that corresponds to this alignment surface. To explain in more detail, if the jig 20 has one alignment portion 201 at each location where it is fixed when attached to the measuring device 11, the jig 20 according to this embodiment has at least two alignment portions 201 (for example, alignment portions 201-1 and 201-2 shown in Figure 6). However, it is preferable that the alignment surface of alignment portion 201-1 and the alignment surface of alignment portion 201-2 are the bottom surfaces of the jig 20 at the same height. In other words, the jig 20 according to this embodiment is attached (fixed) to the measuring device 11 by at least two alignment portions 201 provided at different locations, and by sharing at least one alignment surface with the measuring device 11, it is possible to determine the mounting position of the jig 20 with respect to the measuring device 11.

[0064] The method for fixing the alignment unit 201 to the measuring device 11 may be as described in (1-1), using screws 207, or by fitting the convex and concave parts together. As for the alignment surface, in this embodiment, for example, a configuration in which the bottom surface of the jig 20 and the upper surfaces of the bottom plates 118 provided on both sides of the measuring device 11 are shared (i.e., a configuration in which the xz plane is shared) is conceivable. The imaging unit 110 of the measuring device 11 is either directly fixed to the bottom plate 118 or placed on the bottom plate 118 with one or more plates in between, so by the alignment unit 201 appropriately aligning the bottom surface of the jig 20 and the bottom plate 118 of the measuring device 11 (aligning them so that the bottom plate 118 on which the imaging unit 110 is placed and the bottom surface of the jig 20 are parallel (or nearly parallel)), it is possible to perform high-precision alignment of the imaging unit 110.

[0065] (1-3-3) Shape of the alignment part 201 Next, the shape of the alignment portion 201 will be described. The jig 20 according to this embodiment has the shape shown in Figures 2 and 6, for example. Specifically, it has a shape that can contact the guide rail 103 in the center, and protrudes (extends) toward the measuring device 11 at both ends on the left and right sides of the center. These protruding left and right ends correspond to the alignment portion 201 (specifically, alignment portions 201-1 and 201-2).

[0066] As mentioned above, when attaching the jig 20 to the measuring device 11, it is necessary to share an alignment surface. To achieve this, at least one of the jig 20 or the measuring device 11 must have a protruding shape to create an overlapping area (an area that becomes the alignment surface). As an example, in this embodiment, the alignment portion 201 of the jig 20 is shaped to protrude toward the measuring device 11. As another example, in the jig 25 of the second embodiment described later, the bottom plate 118 of the measuring device 11 has a shape that protrudes toward the jig 20, so that the protruding portion of the bottom plate 118 and the alignment portion 201 of the jig 20 can share an alignment surface. Although not specifically illustrated, it is also acceptable for both the jig 20 and the measuring device 11 to have shapes that protrude toward the alignment surface.

[0067] As shown in the first embodiment, by making the left and right ends of the jig 20 protrude, the measuring device 11 can be made compact, and the manufacturing cost of the measuring device 11 can be kept low. Furthermore, in this case, the measuring device 11 has a physically robust structure with suppressed protruding parts, so the risk of the measuring device 11 colliding with structures in the movement path when the moving body (elevator car 101) on which the measuring device 11 is placed moves can be reduced, and the degree of freedom in the layout of equipment in the movement path can also be increased.

[0068] (1-3-4) Spacing of alignment section 201 As mentioned above, the jig 20 has at least two or more alignment parts 201 within the same plane (e.g., the bottom plane) that constitutes the alignment surface. By making the spacing between the alignment parts 201 sufficiently wide, it is possible to suppress the in-plane rotation error of the jig 20 relative to the measuring device 11. As a result, when the measuring device 11 is installed on the bracket 21 by the installation procedure shown in (1-2), the rotation error of the measuring device 11 relative to the stationary structure (guide rail 103) can be reduced. The reason for this will be explained below with reference to Figures 9 and 10.

[0069] Figure 9 is a top view illustrating the in-plane rotation error of the jig 20 relative to the measuring device 11. As shown in Figure 9, the jig 20 has through holes 206 (individually, through holes 206-1, 206-2) in each alignment section 201. The measuring device 11 also has through holes 117 (individually, through holes 117-1, 117-2) in the bottom plate 118 at positions corresponding to the through holes 206 in the alignment section 201.

[0070] When attaching the jig 20 to the measuring device 11, the position of the jig 20 relative to the measuring device 11 can be determined by aligning the through holes 206 and 117 and fastening them with screws 207. Note that the through holes 206 and 117 may be a combination of protrusions and indentations rather than through holes; in this case, the position of the jig 20 relative to the measuring device 11 can be determined by fitting the protrusions and indentations together.

[0071] Here, for example, positional errors may occur in through holes 206 and 117 due to screw tolerance and hole drilling accuracy. Figure 9 highlights the state in which an in-plane rotation error (around the y-axis) of the jig 20 relative to the measuring device 11 occurs due to this positional error.

[0072] Figure 10 is a conceptual diagram for calculating the in-plane rotation error of the jig 20 relative to the measuring device 11. As mentioned above, in this embodiment, there are at least two locations where the through-hole 206 and the through-hole 117 overlap (positioning locations by the alignment section 201), and in Figure 10, the maximum distance between the alignment sections 201 is denoted as L. Also in Figure 10, the magnitude of the positional error of the through-hole 206 and the through-hole 117 relative to the design nominal position at the positioning location is denoted as δ. In this case, the in-plane rotation error ε caused by the positional error δ between the through-hole 206 and the through-hole 117 is tan(δ / L) (see Figure 10).

[0073] Therefore, if the required value for in-plane rotation accuracy of the jig 20 relative to the measuring device 11 is φ, then if the in-plane rotation error ε is less than or equal to the required rotation accuracy φ, then high-precision installation that satisfies the required rotation accuracy φ can be achieved. Expressed mathematically, it is required that the relationship "φ≧ε" is satisfied. Rearranging the above formula, we get "φ≧tan(δ / L)", and rearranging for L further, we get "L≧δ×atan(φ)". In other words, in this embodiment, by making the spacing L of the alignment parts 201 sufficiently wide so as to satisfy "L≧δ×atan(φ)", high-precision installation of the jig 20 relative to the measuring device 11 can be achieved, and consequently, high-precision installation of the measuring device 11 relative to the elevator car 101 (bracket 21) can be achieved.

[0074] As described above, according to the jig 20 of this embodiment, the jig 20 is assembled to the measuring device 11 having an imaging means, and while the jig 20 remains assembled to the measuring device 11, two predetermined surfaces of the jig 20 (first surface P202, second surface P203) are brought into contact with the corresponding surfaces on the stationary structure (guide rail 103), the measuring device 11 is fixed to the moving body (for example, an elevator car 101, more specifically a bracket 21) while in this contact state (at this time, a laminated member 24 with adjusted thickness may be inserted to adjust the inclination of the measuring device 11 with respect to the bracket 21), and after fixing, the jig 20 is removed from the measuring device 11, thereby enabling the measuring device 11 to be installed on the moving body (elevator car 101, bracket 21) with high precision and in a simple manner.

[0075] (2) Second embodiment A jig 25 according to a second embodiment of the present invention will now be described.

[0076] Figure 11 is an overhead view showing the positional relationship between the jig 25 and a stationary structure, etc., according to a second embodiment of the present invention. More specifically, Figure 11 shows the positional relationship between the jig 25, the measuring device 11, and the stationary structure (guide rail 103) when the measuring device 11 is installed on a bracket 21 fixed to the elevator car 101 using the jig 25. In the second embodiment, the jig 25 has a different shape from the jig 20 according to the first embodiment in the structure near where it contacts the measuring device 11 (i.e., the structure of the alignment part 251), and in accordance with the shape of this jig 25, a part of the shape of the measuring device 11 (specifically, the shape of the bottom plate 118, which will be described in detail later) is also different.

[0077] In the second embodiment, the configuration of the elevator system 10 (1-1), the procedure for installing the measuring device 11 using the jig 25 on the bracket 21 of the elevator car (1-2), and the structure of the jig 25 near the part that contacts the stationary structure (guide rail 103) (1-3-1) are the same as those of the jig 20 in the first embodiment, so a detailed explanation is omitted. Also, the structural components used for alignment with the measuring device 11 in the jig 25 may be considered the same as those in (1-3-2) in the first embodiment, and the spacing of the alignment parts 251 may be considered the same as the spacing of the alignment parts 201 in the first embodiment (1-3-4).

[0078] As shown in Figure 11, in the jig 25 according to the second embodiment, the alignment portion 251 does not protrude toward the measuring device 11 side, unlike the alignment portion 201 of the jig 20 according to the first embodiment, and is formed with approximately the same width as the central portion that can contact the guide rail 103. Corresponding to the shape of the alignment portion 251 of the jig 25, the bottom plate 118 of the measuring device 11 has a shape that protrudes toward the jig 20 side. That is, when the jig 25 can be assembled and used with the measuring device 11 according to the second embodiment, as shown in Figure 11, the upper surface of the bottom plate 118 that protrudes toward the measuring device 11 side and the bottom surface of the alignment portion 251 of the jig 25 are shared as an alignment surface.

[0079] According to the jig 25 of the second embodiment having the shape described above, the measuring device 11 can be installed on the moving body (elevator car 101, bracket 21) with high precision and ease, similar to the jig 20 of the first embodiment, and the material costs for manufacturing the jig 25 can be reduced compared to the jig 20.

[0080] (3) Third Embodiment A jig 26 according to a third embodiment of the present invention will now be described.

[0081] Figure 12 is an overhead view of a jig 26 according to a third embodiment of the present invention. The jig 26 has a different structure from the jig 20 according to the first embodiment in the vicinity where it contacts the stationary structure (guide rail 103).

[0082] In the third embodiment, the configuration of the elevator system 10 (1-1), the shape of the alignment portion 201 (1-3-3), and the spacing of the alignment portions 201 (1-3-4) are the same as those of the jig 20 according to the first embodiment, so a detailed explanation is omitted. Furthermore, the procedure for installing the measuring device 11 on the bracket 21 of the elevator car using the jig 26 may be considered the same as (1-2) in the first embodiment, except for some procedures (step S102) described later, and the structural components used for alignment with the measuring device 11 in the jig 26 may also be considered the same as (1-3-2) in the first embodiment.

[0083] As shown in Figure 12, the jig 26, like the jig 20 according to the first embodiment, has a first surface P202 that faces the front surface (top surface of the convex portion) of the guide rail 103, and a second surface P203 that is the right-hand surface (of the two sides, the surface located on the positive x-axis side) of the surface facing the guide rail 103 (the side of the convex portion). Furthermore, unlike the jig 20 according to the first embodiment, the jig 26 has a third surface P261 that is the left-hand surface (of the two sides, the surface located on the negative x-axis side) of the surface facing the guide rail 103 (the surface located on the negative x-axis side). In other words, the jig 26 has a first surface P202, and a second surface P203 and a third surface P261 that are opposite the first surface P202, as surfaces that can contact the stationary structure (guide rail 103) (in other words, the surface facing the guide rail 103 has a U-shape).

[0084] In the third embodiment, the worker can achieve more stable installation by bringing the jig 26 into contact with the stationary structure (guide rail 103) between the second surface P203 and the third surface P261.

[0085] Figure 13 is a top view of the jig 26. As shown in Figure 13, it is preferable that the distance 262 between the second surface P203 and the third surface P261 of the jig 26 be within the width of the stationary structure (guide rail) 103 and within the tolerance range, so that the jig 26 can be fitted into the stationary structure (guide rail) 103.

[0086] Then, in the installation work of mounting the measuring device 11 to the bracket 21 of the elevator car 101 using the jig 26 having the shape described above, instead of the procedure in step S102 of Figure 5, the jig 26 is brought into contact with the guide rail 103 so that at least one of the second surface P203 and the third surface P261 overlaps with the side surface of the guide rail 103. The other steps may be the same as the installation procedure shown in Figure 5.

[0087] According to the jig 26 of the third embodiment described above, the measuring device 11 can be installed on the moving object (elevator car 101, bracket 21) with high precision and ease, similar to the jig 20 of the first embodiment.

[0088] (4) Fourth Embodiment A jig 27 according to a fourth embodiment of the present invention will now be described.

[0089] Figure 14 is an overhead view of the jig 27 according to the fourth embodiment of the present invention. The jig 27 has a different structure from the jig 20 according to the first embodiment in the vicinity where it contacts the stationary structure (guide rail 103).

[0090] In the fourth embodiment, the configuration of the elevator system 10 (1-1), the shape of the alignment portion 201 (1-3-3), and the spacing of the alignment portions 201 (1-3-4) are the same as those of the jig 20 according to the first embodiment, so a detailed explanation is omitted. Also, the procedure for installing the measuring device 11 on the bracket 21 of the elevator car using the jig 27 may be considered the same as (1-2) in the first embodiment, and the structural components used for alignment with the measuring device 11 in the jig 27 may be considered the same as (1-3-2) in the first embodiment.

[0091] As shown in Figure 14, unlike the jig 20 according to the first embodiment, the jig 27 has three protrusions (first protrusion 271, second protrusion 272, third protrusion 273) that are opposite to the front surface (top surface of the protrusion) of the guide rail 103 and are not on the same straight line, and two protrusions (fourth protrusion 274, fifth protrusion 275) that are opposite to the side surface (side surface of the protrusion) of the guide rail 103 and are on a straight line that is not perpendicular to the front surface of the guide rail 103.

[0092] In the first to third embodiments, we have described a structure in which two or more predetermined surfaces of the jig abut against predetermined surfaces of the stationary structure (guide rail 103). However, considering that jigs and stationary structures are generally made of metal, it may be difficult to strictly achieve surface contact where the corresponding surfaces are in complete contact. Therefore, the jig 27 according to the fourth embodiment achieves contact of the jig 27 with the stationary structure (guide rail 103) by point contact using multiple protrusions (first protrusion 271 to fifth protrusion 275), thereby enabling alignment of the measuring device 11 with even higher precision than the jigs according to the first to third embodiments. This will be explained in detail below.

[0093] First, the jig 27 is fixed when the first projection 271, the second projection 272, and the third projection 273 contact the front surface of the guide rail 103, thereby fixing the surface P276 that includes the three contact points (the tips of the three projections), and fixing the three degrees of freedom of the jig 27: translation in the z direction, rotation around the x axis (elevation angle), and rotation around the y axis (azimuth angle).

[0094] In other words, the surface P276 formed by the three tips of the first projection 271, the second projection 272, and the third projection 273 plays the role of the first surface P202 in the jig 20 according to the first embodiment. Therefore, by arranging the surface P276 formed by the tips of the first projection 271, the second projection 272, and the third projection 273 so as to be optically conjugate with the light-receiving surface P111 of the measuring device 11, the image sensor 112 becomes capable of outputting a focused image.

[0095] Next, the jig 27 is fixed by the contact of the fourth projection 274 and the fifth projection 275 with the side surface of the guide rail 103, thereby fixing a straight line L277 that includes the two contact points (the tips of the two projections), and this straight line L277 fixes at least the degree of freedom of translation of the jig 27 in the x-direction. Furthermore, the degree of freedom of rotation angle (elevation angle) around the z-axis is also fixed as long as the straight line L277 and the plane P276 do not intersect perpendicularly (as long as the straight line L277 is not parallel to the z-axis). Here, since the plane P276 is provided so as to face the front surface (xy-plane) of the stationary structure (guide rail 103), a straight line that intersects the plane P276 perpendicularly is parallel to the z-axis. And in order to impose a constraint on rotation (elevation angle) around the z-axis, it is sufficient to impose a constraint condition in a direction that is not parallel to the z-axis, that is, the condition that the straight line L277 is not parallel to the z-axis is required. From the above, the surface stretched by the straight line L277 and the y-axis plays the role of the second surface P203 in the jig 20 according to the first embodiment.

[0096] As described above, by contacting the guide rail 103, the position and angle of the jig 27 attached to the measuring device 11 are fixed in five degrees of freedom: translation in the x-direction, translation in the z-direction, rotation around the x-axis (elevation angle), rotation around the y-axis (azimuth angle), and rotation around the z-axis (elevation angle) (two degrees of freedom in the translation direction and three degrees of freedom in the rotation direction). Here, the position and angle of the jig 27 would be completely fixed if constraints were added to the three degrees of freedom in the translation direction and the three degrees of freedom in the rotation direction. However, as mentioned above, the jig 27 has five degrees of freedom fixed, and no constraints are added to the degree of freedom in the y-direction translation. Therefore, the jig 27 can translate in the y-direction along the stationary structure (guide rail 103) it is contacting, and the measuring device 11 can be placed on the bracket 21.

[0097] In this way, the jig 27 according to the fourth embodiment, when attached to the measuring device 11, can make point contact with the stationary structure (guide rail 103), thereby enabling high-precision alignment of the measuring device 11 with respect to the guide rail 103.

[0098] Furthermore, in the jig 27, a limitation may be added such that the straight line L277, which includes the tips of the fourth projection 274 and the fifth projection 275, is parallel to the direction A60 of the pixel arrangement of the image sensor 112. By adding such a limitation, when the moving body (elevator car 101) moves, the direction in which the captured image in the measuring device 11 shifts can always be limited to a constant direction (one direction of the pixel arrangement) along direction A60, which is expected to improve the accuracy and reduce the load of the image matching process (process that performs pattern matching between time-series captured images, etc.).

[0099] Furthermore, in the fourth embodiment, a jig 28 with a different configuration can be used, which, like jig 27, has three protrusions capable of forming one surface and two protrusions capable of forming one straight line.

[0100] Figure 15 is an overhead view of a jig 28 according to a fourth embodiment of the present invention. The jig 28 has three protrusions (first protrusion 281, second protrusion 282, third protrusion 283) that are opposite to the side surface (side surface of the convex portion) of the guide rail 103 and are not on the same straight line, and two protrusions (fourth protrusion 284, fifth protrusion 285) that are opposite to the front surface (top surface of the convex portion) of the guide rail 103 and are on a straight line that is not perpendicular to the side surface of the guide rail 103.

[0101] The jig 28 has three degrees of freedom: translation in the x-direction, rotation around the y-axis (azimuth angle), and rotation around the z-axis (elevation angle), all fixed by the first projection 281, the second projection 282, and the third projection 283 contacting the side surface of the guide rail 103. Furthermore, the jig 28 has two degrees of freedom: translation in the x-direction, rotation around the y-axis (azimuth angle), and rotation around the z-axis (elevation angle). Additionally, the jig 28 has two degrees of freedom: translation in the z-direction, all fixed by the fourth projection 284 and the fifth projection 285 contacting the front surface of the guide rail 103, all fixed by the line L287 containing the two contacting points (the tips of the two projections). This line L287 fixes at least the degree of freedom of translation in the z-direction of the jig 28. Moreover, as long as the line L287 and the surface P286 do not intersect perpendicularly (as long as the line L287 is not parallel to the x-axis), the degree of freedom of rotation around the x-axis (elevation angle) is also fixed.

[0102] In other words, in the jig 28, the surface P286 formed by the three points at the tips of the first projection 281, the second projection 282, and the third projection 283 plays the role of the second surface P203 in the jig 20 according to the first embodiment, and the surface stretched by the straight line L287 formed by the two points at the tips of the fourth projection 274 and the fifth projection 275 and the x-axis plays the role of the first surface P202 in the jig 20 according to the first embodiment. To put it another way, the jig 28 has a structure in which the configuration of the area that contacts the front surface of the guide rail 103 (first projection 271, second projection 272, third projection 273) and the configuration of the area that contacts the side surface of the guide rail 103 (fourth projection 274, fifth projection 275) are swapped in the jig 27.

[0103] As described above, by contacting the guide rail 103, the position and angle of the jig 28 attached to the measuring device 11 are fixed in five degrees of freedom (two degrees of freedom in the translation direction and three degrees of freedom in the rotation direction): x-direction translation, z-direction translation, rotation around the x-axis (elevation angle), rotation around the y-axis (azimuth angle), and rotation around the z-axis (elevation angle). No constraints are placed on the y-direction translation degree of freedom.

[0104] Therefore, similar to jig 27, jig 28 can move in the y-direction along the stationary structure (guide rail 103) it is in contact with, allowing the measuring device 11 to be placed on the bracket 21, thus achieving the same effect as jig 27.

[0105] It should be noted that the present invention is not limited to the embodiments described above, and various modifications are included. For example, the embodiments described above are described in detail to make the present invention easier to understand, and are not necessarily limited to those having all the configurations described. Furthermore, it is possible to replace parts of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add configurations from other embodiments to the configuration of one embodiment. In addition, it is possible to add, delete, or replace parts of the configuration of each embodiment with other configurations. [Explanation of Symbols]

[0106] 10 Elevator System 11 Measuring devices 20, 25, 26, 27, 28 Jig 21 Brackets 22 volts 23 Metal plate 24 Laminated members 71 Imaging field 101 Elevator car 102 Elevator Control Unit 103 Guide rail 110 Imaging Unit 112 Image sensor 113 Telescope Tube 114 imaging elements 115 Imaging substrate 116,117,206 through holes 118 Bottom plate 119 Window section 201,251 Alignment section 207 screws 262 interval 271~275,281~285 protrusion A60 direction P202,P203,P261,P276,P286 side P204,P205 area L277,L287 straight line R50, R70 Ray Paths

Claims

1. A jig for mounting a measuring device, which is equipped with an imaging unit for imaging predetermined stationary structures in an elevator shaft, to a moving body that moves along the elevator shaft, When the measuring device is installed on the moving body, the contact portion that comes into contact with the stationary structure while attached to the measuring device is: A first contact portion that contacts the first surface of the stationary structure, A second contact portion that contacts a second surface different from the first surface of the stationary structure, Equipped with, The measuring device further includes an alignment unit that allows for alignment such that the surface including the first contact portion and the light-receiving surface of the imaging unit are substantially parallel when the device is attached to the measuring device. A jig characterized by the following features.

2. When attached to the measuring device, the surface formed by the first contact portion becomes optically conjugate with the light-receiving surface of the imaging unit. The jig according to claim 1.

3. The imaging unit of the measuring device is arranged with photoelectric conversion elements. When attached to the measuring device, the straight line formed by the second contact portion is substantially parallel to the direction in which the photoelectric conversion elements are aligned in the imaging unit. The jig according to claim 1.

4. When attached to the measuring device, the straight line formed by the second contact portion is located outside the imaging field of view of the measuring device. The jig according to claim 1.

5. One of the first and second contact portions is composed of at least three contact points, and the other is composed of at least two contact points. The jig according to claim 1.

6. The alignment unit has a structure that allows for alignment with the measuring device such that the bottom surface of the jig and the alignment surface on which the imaging unit is placed are substantially parallel. The jig according to claim 1.

7. The alignment unit aligns with the measuring device at at least two fixed points within the alignment surface. The jig according to claim 6.

8. When φ is the required rotational accuracy of the jig relative to the measuring device within the alignment plane, and δ is the positional error of the alignment at the fixed point, The alignment section ensures that the maximum distance between the at least two fixed points is δ × atan(φ) or greater. The jig according to feature 7.

9. The fixed point is positioned so as to protrude toward the light-receiving surface of the imaging unit, rather than from the opening provided in the measuring device for capturing scattered light from light irradiated toward the stationary structure. The jig according to feature 7.

10. The fixed point is located at a position that protrudes toward the stationary structure from the opening provided in the measuring device for capturing scattered light from light irradiated toward the stationary structure. The jig according to feature 7.

11. When the measuring device is mounted on the moving body, the contact portion that comes into contact with the stationary structure while attached to the measuring device is: The aforementioned contact portion further has a third contact portion that can contact a third surface of the stationary structure that is opposite the second surface, with the first surface in between, when the measuring device is mounted on the moving body. When attached to the aforementioned measuring device, The first contact portion and at least one of the second contact portion or the third contact portion are in contact with the stationary structure. The alignment unit aligns the surface including the first contact portion and the light-receiving surface of the imaging unit so that they are substantially parallel. The jig according to claim 1.

12. A measuring device that is attached to a moving body that moves in an elevator shaft using a jig, and measures the distance or speed of the moving body, An imaging unit for imaging stationary structures arranged along the direction of movement of the moving body in the elevator shaft, A calculation unit that calculates the distance or speed of the moving object based on the imaging results from the imaging unit, A jig that can be attached to and detached from the measuring device, and which is used to align the measuring device while it is attached to the moving body when the measuring device is mounted on the moving body, Equipped with, The jig, when attached to the measuring device, comprises a first contact portion that contacts a first surface of the stationary structure, and a second contact portion that contacts a second surface of the stationary structure different from the first surface. The jig further includes an alignment portion that allows for positioning such that the surface including the first contact portion and the light-receiving surface of the imaging portion are substantially parallel when attached to the measuring device. The measuring device has at least two fixed points within the alignment surface on which the imaging unit is placed. The alignment portion has a structure that allows alignment at at least two fixed points so that the bottom surface of the jig and the alignment surface are substantially parallel when the jig is attached to the measuring device. A measuring device characterized by the following features.

13. A method for aligning a measuring device for mounting a measuring device on a moving body that moves along an elevator shaft, using a jig, The measuring device has an imaging unit that images a predetermined stationary structure in the elevator shaft, The jig, when attached to the measuring device, has a first contact portion that contacts a first surface of the stationary structure, and a second contact portion that contacts a second surface of the stationary structure that is different from the first surface. The first step is to place the measuring device on a fixed part provided on the upper part of the moving body, A second step is to attach the jig to the measuring device such that the first contact portion of the jig contacts the first surface of the stationary structure and the second contact portion of the jig contacts the second surface of the stationary structure, A third step involves using the jig to align the surface including the first contact portion and the light-receiving surface of the imaging portion so that they are substantially parallel, A method for aligning measuring devices, characterized by comprising the following features.

14. The third step includes a step of adjusting the position of the measuring device and the azimuth angle within the mounting surface by utilizing the difference between the hole diameter in the fixed portion of the moving body and the shaft diameter of the fixing member that fixes the fixed portion. The method for aligning a measuring device according to feature 13.

15. The third step includes a step of adjusting the elevation angle of the measuring device by inserting fixing plates into the gap between the measuring device and the moving body in the fixed part and adjusting the number of fixing plates inserted. The method for aligning a measuring device according to feature 13.

Images