Test piece and external dimensions measurement method

Abstract

To provide a test piece and an outer shape measurement method which can accurately measure an outer shape of a standard reference material covered by transparent films.SOLUTION: A standard reference material 2 and a mount 3 are stored between a lower transparent film 4 and an upper transparent film 5. The lower transparent film 4 is provided extruded downward and has a concave storage part 41 in which the standard reference material 2 is stored. The mount 3 has a through hole 31 larger than the standard reference material 2 at a part facing the storage part 41 in a vertical direction. The upper transparent film 5 has a flat part 51 at a part facing the through hole 31 of the mount 3 in the vertical direction.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a test piece and an outer shape measurement method.

Background Art

[0002] Detection of foreign substances mixed in a test object such as food is performed using an X-ray inspection apparatus. It is known that a test piece is used to confirm the detection accuracy of foreign substances in this X-ray inspection apparatus (Patent Document 1). Specifically, a test piece having a structure in which a standard substance of a predetermined shape is covered with a transparent film is attached to a test object, and an X-ray inspection is performed with an X-ray inspection apparatus. The size of detectable foreign substances can be confirmed by the appearance (imaging method) of the standard substance in the X-ray transmission image.

[0003] FIG. 4(b) of Patent Document 1 discloses a multi-connected type test piece having a plurality of standard substances, and an example thereof is shown in FIG. 11. This test piece 100 includes a mount 101, a plurality of spherical standard substances 102 arranged in a row on the mount 101, a first transparent film 104 provided with a plurality of concave accommodating portions 103 formed in a row in the thickness direction and having a hemispherical (or bullet-shaped) extrusion and accommodating each standard substance 102, and a flat second transparent film 105. The outer diameters of the plurality of standard substances 102 are different from each other, and they are arranged in the order of the size of the outer diameter. The inner diameters of the plurality of accommodating portions 103 of the first transparent film 104 are determined to correspond to the outer diameters of the respective standard substances 102, and they are arranged in the order of the size of the inner diameter. Then, the mount 101 on which the standard substances 102 are attached is sandwiched between the first transparent film 104 and the second transparent film 105 so that each standard substance 102 is accommodated in the corresponding accommodating portion 103. Next, by heat-sealing the outer peripheral edge portions of the first transparent film 104 and the second transparent film 105 to integrate them, a test piece 100 having a structure in which a plurality of standard substances 102 having different outer diameters arranged in the order of size are covered with the transparent films 104 and 105 can be obtained. Note that there is also a single type of test piece having one standard substance.

Prior Art Documents

Patent Documents

[0004] [Patent Document 1] Japanese Patent Publication No. 2009-31149 [Overview of the project] [Problems that the invention aims to solve]

[0005] Test pieces are an important tool for verifying the accuracy of foreign object detection by X-ray inspection equipment. Therefore, standard materials covered with transparent film must be manufactured precisely so that their external shape, outer diameter, etc., are specified. For example, if the standard material is spherical, and the outer diameter of the standard material displayed on the transparent film differs from the actual outer diameter of the standard material covered by the transparent film, it may become impossible to guarantee the accuracy of foreign object detection using X-ray transmission images. Furthermore, if the test piece is the multi-piece type mentioned above, the outer diameters of each of the multiple standard materials must be correct, and each standard material must be arranged in order of size. Even if the outer diameters of each of the multiple standard materials are correct, if the positions of the standard materials are mixed up when arranging them, and the multiple standard materials are not arranged in order of size, it is conceivable that the image of the standard material appearing in the X-ray transmission image will be misevaluated. In this case as well, it may become impossible to guarantee the accuracy of foreign object detection using X-ray transmission images.

[0006] Therefore, in order to guarantee the accuracy of foreign object detection using X-ray inspection equipment with test pieces, a process is carried out at the time of manufacture to confirm that the test pieces are manufactured as genuine products. In this case, it is common practice to check the outer shape (or outer diameter if the standard material is spherical) from the outside of the transparent film after the manufacturing process of the test piece is completed.

[0007] Figure 12 shows a method for measuring the outer diameter of a spherical standard material 102 by photographing it with a camera from the side of the first transparent film 104 of the test piece 100. In Figure 12, a camera (not shown) is positioned above the housing 103 of the test piece 100 with its shooting direction facing downwards, and photographs the standard material 102 below through the housing 103. Light coming to the standard material 102 from around the test piece 100 is reflected by the standard material 102 and reflected in all directions around it, but the camera captures the light reflected upwards, as indicated by the vertical arrows in the figure, and photographs the standard material 102. At this time, at least a portion of the light reflected by the standard material 102 and heading towards the camera is refracted as it passes through the housing 103 of the first transparent film 104, as indicated by the vertical arrows in the figure, and its path changes, so the outer diameter of the photographed standard material 102 was sometimes measured as a length DF that was larger than its actual size. Thus, a problem existed in that it was sometimes difficult to accurately measure the outer diameter of the standard material 102 using reflected light with conventional test pieces 100.

[0008] Figure 13 shows a method for measuring the outer diameter of a standard material 102 by irradiating light upward from below the second transparent film 105 of the test piece 100, and photographing the standard material 102 with a camera positioned downward above the housing portion 103 of the first transparent film 104. In Figure 13(b), as indicated by the upward arrow, the light irradiated upward from below the test piece 100 is photographed by the camera as transmitted light from the test piece 100. Here, at least a portion of the transmitted light is refracted and its path changes as it passes through the housing portion 103 of the first transparent film 104, as indicated by the arrow in the figure. As a result, as shown in Figure 13(a), the inner edge of the annular shadow S1 generated by the hemispherical housing portion 103 of the first transparent film 104 and the outer edge of the circular shadow S2 generated by the standard material 102 may overlap, making it difficult to recognize the outer edge or contour of the standard material 102 from the image. Thus, a problem existed in that it was sometimes difficult to accurately measure the outer diameter of the standard material 102 using transmitted light with the conventional test piece 100.

[0009] The present invention has been made in view of the above circumstances, and its object is to provide a test piece and an external shape measurement method that can accurately measure the external shape of a standard material covered with a transparent film. [Means for solving the problem]

[0010] To achieve the aforementioned objectives, the test piece and external shape measurement method according to the present invention are characterized by the following [1] to [7]. [1] A test piece (1) for confirming the accuracy of foreign object detection by an X-ray inspection device, A standard material (2) formed into a predetermined shape, Opaque sheet portion (3) and The system comprises a first transparent film (4) and a second transparent film (5) that house the standard substance and the sheet portion between them, The first transparent film (4) is formed by extruding in the thickness direction and has a concave housing portion (41, 41C) in which the standard substance is contained, The sheet portion is provided with through holes (31) larger than the standard material in the portion facing the housing portion in the thickness direction. The second transparent film has a flat portion (51) provided at least in the portion of the sheet portion facing the through hole in the thickness direction. death, The standard substance is adhered to the housing portion of the first transparent film. It is a test piece. [2] A test piece (1B) for confirming the accuracy of foreign object detection by an X-ray inspection device, A standard material (2) formed into a predetermined shape, The system comprises a first transparent film (4) and a second transparent film (5) that contain the aforementioned standard material between them, The first transparent film is formed by extruding in the thickness direction and has a concave housing portion (41, 41C) in which the standard substance is contained, The invention further comprises a printed portion (3B) printed on at least one of the first transparent film and the second transparent film, The printing portion is provided with a non-printing area (31B) larger than the standard material in the portion facing the housing portion in the thickness direction. The second transparent film has a flat portion (51) provided at least in the portion facing the non-printed area in the thickness direction, The standard substance is adhered to the housing portion of the first transparent film. It is a test piece. [3] A test piece (1) for confirming the accuracy of foreign object detection by an X-ray inspection device, A standard material (2) formed into a predetermined shape, Opaque sheet portion (3) and The system comprises a first transparent film (4) and a second transparent film (5) that house the standard substance and the sheet portion between them, The first transparent film (4) is formed by extruding in the thickness direction and has a concave housing portion (41, 41C) in which the standard substance is contained, The sheet portion is provided with through holes (31) larger than the standard material in the portion facing the housing portion in the thickness direction. The second transparent film has a flat portion (51) provided at least in the portion of the sheet portion facing the through hole in the thickness direction. death, A gap (ΔG) is provided between the standard substance and the flat portion of the second transparent film. It is a test piece. [4] A test piece (1B) for confirming the accuracy of foreign object detection by an X-ray inspection device, A standard material (2) formed into a predetermined shape, The system comprises a first transparent film (4) and a second transparent film (5) that contain the aforementioned standard material between them, The first transparent film is formed by extruding in the thickness direction and has a concave housing portion (41, 41C) in which the standard substance is contained, The invention further comprises a printed portion (3B) printed on at least one of the first transparent film and the second transparent film, The printing portion is provided with a non-printing area (31B) larger than the standard substance in a portion facing the housing portion in the thickness direction. The second transparent film has a flat portion (51) provided at least in a portion facing the non-printing area in the thickness direction. A gap (ΔG) is provided between the standard substance and the flat portion of the second transparent film. It is a test piece. [5] A test piece (1) for confirming the accuracy of foreign object detection by an X-ray inspection device, A standard substance (2) formed in a predetermined shape, An opaque sheet portion (3), A first transparent film (4) and a second transparent film (5) for housing the standard substance and the sheet portion between each other, The first transparent film (4) is provided by being extruded in the thickness direction and has concave housing portions (41, 41C) for housing the standard substance. The sheet portion is provided with a through hole (31) larger than the standard substance in a portion facing the housing portion in the thickness direction. The second transparent film has a flat portion (51) provided at least in a portion facing the through hole of the sheet portion in the thickness direction. The inner surface of the aforementioned housing is provided on a spherical surface, The aforementioned standard material is provided in a spherical shape, The radius (r2) of the inner surface of the housing is set to be larger than the radius (r1) of the standard material. It is a test piece. [6] A test piece (1B) for confirming the accuracy of foreign object detection by an X-ray inspection device, A standard substance (2) formed in a predetermined shape, A first transparent film (4) and a second transparent film (5) for housing the standard substance between each other, The first transparent film is provided by being extruded in the thickness direction and has concave housing portions (41, 41C) for housing the standard substance. It further includes a printing portion (3B) printed on at least one of the first transparent film and the second transparent film. The printing portion is provided with a non-printing area (31B) larger than the standard material in the portion facing the housing portion in the thickness direction. The second transparent film has a flat portion (51) provided at least in the portion facing the non-printed area in the thickness direction, The inner surface of the aforementioned housing is provided on a spherical surface, The aforementioned standard material is provided in a spherical shape, The radius (r2) of the inner surface of the housing is set to be larger than the radius (r1) of the standard material. It is a test piece. [7] [1]~[6] A method for measuring the external shape of a test piece, The external shape of the test piece is measured based on the image of the standard substance taken through the second transparent film. It must be a method for measuring external dimensions.

[0011] According to the configuration described in [1] above, when a test piece is photographed from the second transparent film side, the standard material can be photographed through the through-holes in the flat and sheet portions of the second transparent film. Since the light passing through the flat portion of the second transparent film is incident on the camera without being refracted at the flat portion, the outer shape of the standard material can be measured with high accuracy. Furthermore, the standard material can be fixed by adhesive to the containment section. Since the standard material is not adhered to the second transparent film, no adhesive is applied to the flat surface. Therefore, the image of the standard material captured by the camera is not distorted by adhesive, and the external shape of the standard material can be measured with high accuracy. According to the configuration described in [2] above, when a test piece is photographed from the second transparent film side, the standard material can be photographed through the flat and unprinted areas of the second transparent film. Therefore, since the light passing through the flat area of ​​the second transparent film is incident on the camera without being refracted by the flat area, the outer shape of the standard material can be measured with high accuracy. Furthermore, the standard material can be fixed by adhesive to the containment section. Since the standard material is not adhered to the second transparent film, no adhesive is applied to the flat surface. Therefore, the image of the standard material captured by the camera is not distorted by adhesive, and the external shape of the standard material can be measured with high accuracy. According to the configuration of [3] above, When a test piece is photographed from the side of the second transparent film, the standard material can be photographed through the through-holes in the flat and sheet portions of the second transparent film. Since light passing through the flat portion of the second transparent film is incident on the camera without being refracted by the flat portion, the outer shape of the standard material can be measured with high accuracy. Because a gap is provided between the standard material and the flat portion of the second transparent film, the standard material does not come into contact with the flat portion and is not photographed by the camera in a distorted state. This allows for even more accurate measurement of the outer shape of the standard material. According to the above configuration [4], When a test piece is photographed from the side of the second transparent film, the standard material can be photographed through the flat and unprinted areas of the second transparent film. Therefore, light passing through the flat area of ​​the second transparent film enters the camera without refraction, allowing for accurate measurement of the standard material's outline. Furthermore, Because a gap is provided between the standard material and the flat portion of the second transparent film, the standard material does not come into contact with the flat portion, preventing the flat portion from being distorted and captured by the camera. This allows for even more accurate measurement of the outer shape of the standard material. According to the configuration described in [5] above, When a test piece is photographed from the side of the second transparent film, the standard material can be photographed through the through-holes in the flat and sheet portions of the second transparent film. Since light passing through the flat portion of the second transparent film enters the camera without refraction at the flat portion, the external shape of the standard material can be measured with high accuracy. Furthermore,The radius of the inner surface of the containment is set to be larger than the radius of the standard material. This reduces the contact area between the containment and the standard material, so that the containment does not interfere with the contour recognition of the standard material in images captured by the camera. of Without having to do anything else, the external shape of the standard material can be measured with even greater accuracy. According to the configuration described in [6] above, When a test piece is photographed from the second transparent film side, the standard material can be photographed through the flat and unprinted areas of the second transparent film. Therefore, light passing through the flat area of ​​the second transparent film enters the camera without being refracted by the flat area, allowing for accurate measurement of the standard material's outline. Furthermore, the radius of the inner surface of the housing is set to be larger than the radius of the standard material. This reduces the contact area between the housing and the standard material, so that the housing does not interfere with the recognition of the standard material's outline in the image captured by the camera, allowing for even more accurate measurement of the standard material's outline. According to the configuration described in [7] above, by photographing the test piece from the second transparent film side, the standard material can be photographed through the through-holes in the flat and sheet portions of the second transparent film. Therefore, since the light passing through the flat portion of the second transparent film is incident on the camera without being refracted at the flat portion, the outer shape of the standard material can be measured with high accuracy. [Effects of the Invention]

[0012] According to the present invention, it is possible to provide a test piece and an external shape measurement method that can accurately measure the external shape of a standard material covered with a transparent film.

[0013] The present invention has been briefly described above. Furthermore, the details of the present invention will be further clarified by referring to the attached drawings and reading through the embodiments for carrying out the invention described below (hereinafter referred to as "embodiments"). [Brief explanation of the drawing]

[0014] [Figure 1] Figure 1 is a top view of a test piece of the present invention in the first embodiment. [Figure 2] Figure 2 is a schematic cross-sectional view along line AA in Figure 1. [Figure 3] Figure 3 is a partial perspective view of the cardboard shown in Figure 1. [Figure 4] Figure 4 is a magnified view of a portion of Figure 2. [Figure 5] Figure 5 is a manufacturing process diagram for the lower transparent film that makes up the test piece shown in Figures 1 and 2. [Figure 6] Figure 6 is a diagram illustrating the manufacturing process of the test pieces shown in Figures 1 and 2. [Figure 7] Figure 7 is a top view of a test piece of the present invention in the second embodiment. [Figure 8] Figure 8 is a schematic cross-sectional view of line BB in Figure 7. [Figure 9] Figure 9 shows modified examples of the lower transparent film in the first and second embodiments. [Figure 10] Figure 10 is a schematic cross-sectional view along line BB in Figure 7 of a modified example of the second embodiment. [Figure 11] Figure 11 is a cross-sectional view showing an example of a conventional test piece. [Figure 12] Figure 12 is a cross-sectional view illustrating the conventional method of measuring the outer diameter of a standard material using reflected light. [Figure 13] Figure 13 is a cross-sectional view illustrating the conventional method of measuring the outer diameter of a standard material using transmitted light. [Modes for carrying out the invention]

[0015] Specific embodiments of the present invention will be described below with reference to the figures.

[0016] For the sake of clarity, the terms "front," "back," "left," "right," "up," and "down" are defined below, as shown in Figures 1 to 3. The "front-back direction," "left-right direction," and "up-down direction" are orthogonal to each other. The up-down direction corresponds to the "thickness direction" of this invention.

[0017] (First Embodiment) First, the test piece 1 of the first embodiment will be described with reference to Figures 1 to 4. The test piece 1 shown in Figures 1 to 4 is a multi-unit type having multiple (five in the example shown in Figure 1) standard substances 2. As shown in Figures 1 and 2, the test piece 1 comprises multiple spherically shaped standard substances 2, an opaque flat backing 3 (sheet portion), and a lower transparent film 4 (first transparent film) and an upper transparent film 5 (second transparent film) that sandwich and house the standard substances 2 and the backing 3 between them.

[0018] The standard materials 2 have different outer diameters and are arranged horizontally in order of their outer diameter size. The backing sheet 3 is provided in a long, roughly rectangular shape in the direction of the arrangement of the standard materials 2 (horizontal direction). In this embodiment, the backing sheet 3 has multiple through holes 31 in the parts that face the standard materials 2 in the vertical direction. As shown in Figures 2 and 3, the multiple through holes 31 are provided to penetrate in the vertical direction. As shown in Figure 1, the same number of through holes 31 as the standard materials 2 are provided and are arranged horizontally. In this embodiment, the through holes 31 are provided in a circular shape when viewed from above, with the same size and shape as the standard materials 2. The inner diameter of the through holes 31 is set to be larger than the outer diameter of the rightmost standard material 2, which has the largest outer diameter among the standard materials 2. In addition, information such as the material and outer diameter of the standard materials 2 is printed on the top and bottom surfaces of the backing sheet 3.

[0019] The lower transparent film 4 and the upper transparent film 5 are made of polyester, polypropylene, or the like. The lower transparent film 4 and the upper transparent film 5 are provided in a roughly rectangular shape that is slightly larger than the backing paper 3. As shown in Figure 2, the lower transparent film 4 is provided by being extruded downwards and has a plurality of concave housing portions 41 in which each standard substance 2 is contained. The plurality of housing portions 41 are provided side by side in the left-right direction. In this embodiment, the housing portions 41 are formed by extruding into a hemispherical shape, and as shown in Figure 4, the radius r2 of the inner surface of the housing portion 41 provided on the spherical surface is set to be larger than the radius r1 of the standard substance 2 to be contained.

[0020] Furthermore, in this embodiment, the radius r2 of the inner surface of the housing section 41 is set to match the radius r1 of the standard material 2 to be housed. That is, the multiple housing sections 41 have different inner surface radii r2 and are arranged in the left-right direction in order of the size of their radii r2.

[0021] In this embodiment, the standard material 2 is bonded to the lowest position on the inner surface of the concave housing 41 by adhesive 6. In this embodiment, the upper transparent film 5 is provided flat overall. As a result, the portion of the upper transparent film 5 facing the through hole 31 in the vertical direction becomes a flat portion 51. In addition, a gap ΔG is provided between the standard material 2 and the flat portion 51 of the upper transparent film 5.

[0022] By adhering the standard substance 2 to the housing portion 41 of the lower transparent film 4, and with the through hole 31 of the backing paper 3 and the standard substance 2 facing each other in the vertical direction, sandwiching the backing paper 3 between the lower transparent film 4 and the upper transparent film 5, and heat-sealing the outer edges of the lower transparent film 4 and the upper transparent film 5 to integrate them, a test piece 1 can be obtained.

[0023] In this embodiment, the standard substance 2 is bonded to the lowest point on the inner surface of the concave housing 41 using adhesive 6. Ideally, the test piece 1 is positioned so that the center of the through-hole 31 in the backing 3, the lowest point of the housing 41, and the center of the standard substance 2 are aligned vertically. However, in reality, the lowest point of the housing 41 and the center of the through-hole 31 are not aligned vertically and are misaligned, resulting in manufacturing errors. The through-hole 31 is made larger than the standard substance 2 than this manufacturing error occurs. As a result, even if manufacturing errors occur, the standard substance 2 can be seen through the upper transparent film 5 and the through-hole 31.

[0024] Next, the manufacturing process of test piece 1 will be described with reference to Figures 5 and 6. As shown in Figure 5(a), the lower transparent film 4, which has been heated and softened by any heating means, is formed using a vacuum forming apparatus 20. The vacuum forming apparatus 20 has a mold 23 consisting of a hemispherical projection 21 corresponding to the housing portion 41 of the lower transparent film 4, and a flat plate portion 22 continuous with the projection 21. The inside of the projection 21 is a cavity 24, and a plurality of through holes 25 communicating with the cavity 24 are formed on the upper surface of the projection 21. One end of a suction tube 26 communicating with the cavity 24 is connected to the flat plate portion 22, and a suction device (not shown) is connected to the other end of the suction tube 26.

[0025] As shown in Figure 5(b), the heated and softened flat lower transparent film 4 is placed over the mold 23 of the vacuum forming apparatus 20. The suction device is activated to generate negative pressure in the cavity 24 as indicated by the arrow. The softened lower transparent film 4 adheres to the mold 23 due to the negative pressure generated in the cavity 24.

[0026] As shown in Figure 5(c), after a predetermined forming time has elapsed due to negative pressure, the lower transparent resin film 4, which has been formed into the shape of the mold 23, is removed from the mold 23 of the vacuum forming apparatus 20.

[0027] Next, the standard substance 2 is adhered to the housing portion 41 of the lower transparent film 4. Then, as shown in Figure 6(a), the backing paper 3 is sandwiched between the lower transparent film 4 and the upper transparent film 5. At this time, the backing paper 3 is sandwiched so that the through hole 31 provided in the backing paper 3 and the standard substance 2 are facing each other in the vertical direction. As shown in Figure 6(b), the outer edges of the lower transparent film 4 and the upper transparent film 5 are clamped with a heat sealing device 30 and heat sealed to obtain the test piece 1 of the first embodiment.

[0028] Next, the measurement of the outer diameter of the standard substance 2 in the test piece 1 of the first embodiment will be described.

[0029] Figure 2 shows a method for measuring the outer diameter of a standard material 2 by photographing it with a camera 40 from the side of the upper transparent film 5 of the test piece 1. In Figure 2, the camera 40 is positioned above the housing 41 of the test piece 1 with the shooting direction facing downwards, and photographs the standard material 2 from above through the flat part 51 and the through-hole 31 of the backing paper 3. Light coming to the standard material 2 from around the test piece 1 is reflected by the standard material 2 and reflected in all directions, but the camera 40 captures the light reflected upwards, as indicated by the arrow in the figure, and photographs the standard material 2. At this time, the light reflected by the standard material 2 and heading towards the camera 40 passes only through the flat part 51 of the upper transparent film 5, as indicated by the arrow in the figure, so the outer diameter D of the photographed standard material 2 is true to size, and the outer diameter D of the standard material 2 can be measured accurately by photographing with reflected light.

[0030] According to the embodiment described above, the mounting board 3 is provided with a through-hole 31 larger than the standard material 2 in the portion facing the housing portion 41 of the lower transparent film 4 in the vertical direction, and the upper transparent film 5 is provided with a flat portion 51 in the portion facing the through-hole 31 of the mounting board 3 in the vertical direction. As a result, when the test piece 1 is photographed from the upper transparent film 5 side, the standard material 2 can be photographed through the flat portion 51 of the upper transparent film 5 and the through-hole 31 of the mounting board 3. Therefore, the light passing through the flat portion 51 of the upper transparent film 5 is incident on the camera 40 without being refracted by the flat portion 51, so the outer diameter D of the standard material 2 can be measured with high accuracy.

[0031] According to the embodiment described above, the standard material 2 is adhered to the housing portion 41 of the lower transparent film 4. This allows the standard material 2 to be fixed within the housing portion 41. Since the standard material 2 is not adhered to the upper transparent film 5, no adhesive is applied to the flat portion 51. Therefore, the image of the standard material 2 captured by the camera 40 is not distorted by adhesive, and the outer diameter D of the standard material 2 can be measured with high accuracy.

[0032] According to the embodiment described above, a gap ΔG is provided between the standard material 2 and the flat portion 51 of the upper transparent film 5. As a result, the standard material 2 does not come into contact with the flat portion 51 and the camera 40 does not capture the flat portion 51 in a distorted state, thus enabling more accurate measurement of the outer diameter D of the standard material 2.

[0033] According to the embodiment described above, the inner surface of the housing portion 41 is spherical, the standard material 2 is spherical, and the radius r2 of the inner surface of the housing portion 41 is larger than the radius r1 of the standard material 2. As a result, the contact area between the housing portion 41 and the standard material 2 can be reduced, so that the outer diameter D of the standard material 2 can be measured with even greater accuracy in the image captured by the camera 40 without the housing portion 41 interfering with the contour recognition of the standard material 2.

[0034] (Second Embodiment) Next, the test piece 1B of the second embodiment will be described with reference to Figures 7 and 8. In Figures 7 and 8, parts equivalent to those of the test piece 1 shown in Figures 1 and 2 described in the first embodiment above are denoted by the same reference numerals, and their detailed descriptions are omitted. As shown in the figures, the test piece 1B comprises a standard substance 2, a lower transparent film 4 and an upper transparent film 5, and an opaque printed area 3B printed on the upper transparent film 5. In the second embodiment, the backing paper 3 is not housed between the lower transparent film 4 and the upper transparent film 5. The printed area 3B has information such as the material and outer diameter of the standard substance 2 printed on it. More specifically, in this embodiment, the printed area 3B has an information area (such as letters and numbers) that represents information such as the material and outer diameter of the standard substance 2, and an opaque background area that serves as the background for this information. In this embodiment, the background area of ​​the printed area 3B is provided on the entire surface of the upper transparent film 5, excluding the peripheral edge and the non-printed area 31B, which will be described later.

[0035] Since the standard material 2, the lower transparent film 4, and the upper transparent film 5 are the same as those in the first embodiment described above, a detailed explanation is omitted here. In this embodiment, the printing section 3B is provided on the lower surface of the upper transparent film 5 and is located in a rectangular area that is slightly smaller than the upper transparent film 5. The printing section 3B has a non-printing area 31B that is larger than the standard material 2 in the portion corresponding to the housing section 41 in the vertical direction. The same number of non-printing areas 31B as the standard material 2 are provided and are arranged side by side in the left-right direction.

[0036] In this embodiment, the non-printed areas 31B are arranged in a circular shape when viewed from above, with the same size and shape as the others. The inner diameter of the non-printed areas 31B is set to be larger than the outer diameter of the rightmost standard material 2, which has the largest diameter among the standard materials 2. In the test piece 1B of the second embodiment, ideally, the center of the non-printed area 31B, the lowest position of the housing section 41, and the center of the standard material 2 are aligned in the vertical direction. However, in reality, the lowest position of the housing section 41 and the center of the non-printed area 31B are not aligned in the vertical direction and are misaligned, resulting in manufacturing errors. The non-printed areas 31B are set to be larger than the standard material 2 than this manufacturing error occurs. As a result, even if manufacturing errors occur, the standard material 2 can be seen through the upper transparent film 5 and the non-printed areas 31B. In addition, the diameter of the standard material 2 is displayed in the printed section 3B.

[0037] As described above, the printed section 3B has a non-printed area 31B in the portion of the lower transparent film 4 that is vertically opposite to the housing section 41, and the upper transparent film 5 has a flat portion 51 in the portion of the upper transparent film 5 that is vertically opposite to the non-printed area 31B. As a result, when the test piece 1 is photographed from the upper transparent film 5 side, the standard material 2 can be photographed through the upper transparent film 5 and the non-printed area 31B. Therefore, light passing through the flat portion 51 of the upper transparent film 5 is incident on the camera 40 without being refracted by the flat portion 51, so the outer diameter D of the standard material 2 can be measured with high accuracy.

[0038] (Modifications of the first and second embodiments) Next, modifications of the first and second embodiments described above will be explained with reference to Figure 9. In the first and second embodiments, the housing portion 41 was provided in a hemispherical shape, but it is not limited to this. Test pieces 1 and 1B may have a housing portion 41C shown in Figure 9 instead of the housing portion 41 described in the first and second embodiments. As shown in the figure, the housing portion 41C has a spherical portion 41C1 provided at the bottom and a conical portion 41C2 provided in a conical shape above the spherical portion 41C1. The inner diameter r3 of the inner surface of the spherical portion 41C1 is equal to the radius r1 of the standard material 2. As a result, the lower side of the standard material 2 fits snugly into the spherical portion 41C1. In this embodiment, the standard material 2 is not adhered to the lower transparent film 4. Even without adhering the standard material 2 to the lower transparent film 4, when the lower transparent film 4 is turned downwards, the lower side of the standard material 2 fits snugly into the spherical portion 41C1, and the position of the standard material 2 is determined.

[0039] In this case, the spherical portion 41C1 is positioned such that the contact angle θ between the standard material 2 and the housing portion 41C is 180 degrees or less. By setting the contact angle θ to 180 degrees or less in this way, the area in contact with the inner surface of the housing portion 41C becomes less than half of the total surface area of ​​the standard material 2. As a result, the outer diameter D of the standard material 2 can be measured with even greater accuracy in the image captured by the camera 40, without the housing portion 41C interfering with the contour recognition of the standard material 2.

[0040] (Modified version of the second embodiment) Next, a modified example of the second embodiment described above will be explained with reference to Figure 10. In Figure 10, parts equivalent to those in the test piece 1B shown in Figure 8, which was already explained in the second embodiment, are denoted by the same reference numerals, and their detailed explanation is omitted. In the second embodiment, the printed section 3B was provided on the lower surface of the upper transparent film 5, but this is not the only option. In the test piece 1D shown in Figure 10, the printed section 3D is provided on the upper surface of the lower transparent film 4. In this case, since the printed section 3D cannot be provided in the housing section 41 for manufacturing purposes, the non-printed area 31D is made larger than the housing section 41.

[0041] Furthermore, the present invention is not limited to the embodiments described above, and can be modified, improved, etc., as appropriate. In addition, the material, shape, dimensions, number, placement, etc. of each component in the embodiments described above are arbitrary and not limited, as long as they can achieve the present invention.

[0042] In the embodiments described above, the multiple through holes 31 and non-printed areas 31B provided in test pieces 1 and 1B were of the same size and shape, but this is not limited to this. The sizes of the multiple through holes 31 and non-printed areas 31B do not have to be the same, and may be matched to the radius of the standard material 2.

[0043] In the embodiment described above, the standard substance 2 was adhered to the lower transparent film 4, but this is not the only option. The standard substance 2 does not need to be adhered to either the lower transparent film 4 or the upper transparent film 5.

[0044] In the modifications of the first and second embodiments described above, the inner diameter r3 of the spherical portion 41C1 was set to be the same as the radius r2 of the standard material 2, but this is not the only option. The inner diameter r3 of the spherical portion 41C1 may be larger than the radius r2 of the standard material 2.

[0045] In the embodiments described above, the standard substance 2 was provided in a spherical shape, but it is not limited to this. The standard substance 2 can be provided in any predetermined shape and does not have to be spherical. In the embodiments described above, the outer diameter of the spherical standard substance 2 was measured as the outer shape of the standard substance 2, but it is not limited to this. The shape or size of the standard substance 2 may also be measured as the outer shape of the standard substance 2.

[0046] In the first embodiment described above, a backing sheet 3 was used as the sheet portion, but it is not limited to this. The sheet portion can be any opaque sheet-like material, and may be made of a resin plate or the like.

[0047] In the second embodiment described above, the printing section 3B was provided on the lower surface of the upper transparent film 5, but it may also be provided on the upper surface of the upper transparent film 5, or on both the upper and lower surfaces of the upper transparent film 5. Furthermore, in a modified version of the second embodiment, the printing section 3D was provided on the upper surface of the lower transparent film 4, but it may also be provided on the lower surface of the lower transparent film 4, or on both the upper and lower surfaces of the lower transparent film 4. [Explanation of symbols]

[0048] 1.1B Test Piece 2 Standard material 3. Backing board (sheet portion) 3B Printing Department 4. Lower transparent film (first transparent film) 5. Upper transparent film (second transparent film) 31 Through hole 31B Non-print area 41,41C Storage section 51 Flat area ΔG gap

Claims

1. A test piece (1) for confirming the accuracy of foreign object detection by an X-ray inspection device, A standard substance (2) formed into a predetermined shape, Opaque sheet portion (3) and The system comprises a first transparent film (4) and a second transparent film (5) that house the standard substance and the sheet portion between them, The first transparent film (4) is formed by extruding in the thickness direction and has a concave housing portion (41, 41C) in which the standard substance is contained, The sheet portion is provided with through holes (31) larger than the standard material in the portion facing the housing portion in the thickness direction. The second transparent film has a flat portion (51) provided at least in the portion of the sheet portion facing the through hole in the thickness direction, The standard substance is adhered to the housing portion of the first transparent film. Test piece.

2. A test piece (1B) for confirming the accuracy of foreign object detection by an X-ray inspection device, A standard substance (2) formed into a predetermined shape, The system comprises a first transparent film (4) and a second transparent film (5) that contain the aforementioned standard material between them, The first transparent film is formed by extruding in the thickness direction and has a concave housing portion (41, 41C) in which the standard substance is contained, The invention further comprises a printed portion (3B) printed on at least one of the first transparent film and the second transparent film, The printing portion is provided with a non-printing area (31B) that is larger than the standard material in the portion facing the housing portion in the thickness direction. The second transparent film has a flat portion (51) provided at least in the portion facing the non-printed area in the thickness direction, The standard substance is adhered to the housing portion of the first transparent film. Test piece.

3. A test piece (1) for confirming the accuracy of foreign object detection by an X-ray inspection device, A standard substance (2) formed into a predetermined shape, Opaque sheet portion (3) and The system comprises a first transparent film (4) and a second transparent film (5) that house the standard substance and the sheet portion between them, The first transparent film (4) is formed by extruding in the thickness direction and has a concave housing portion (41, 41C) in which the standard substance is contained, The sheet portion is provided with through holes (31) larger than the standard material in the portion facing the housing portion in the thickness direction. The second transparent film has a flat portion (51) provided at least in the portion of the sheet portion facing the through hole in the thickness direction, A gap (ΔG) is provided between the standard substance and the flat portion of the second transparent film. Test piece.

4. A test piece (1B) for confirming the accuracy of foreign object detection by an X-ray inspection device, A standard substance (2) formed into a predetermined shape, The system comprises a first transparent film (4) and a second transparent film (5) that contain the aforementioned standard material between them, The first transparent film is formed by extruding in the thickness direction and has a concave housing portion (41, 41C) in which the standard substance is contained, The invention further comprises a printed portion (3B) printed on at least one of the first transparent film and the second transparent film, The printing portion is provided with a non-printing area (31B) that is larger than the standard material in the portion facing the housing portion in the thickness direction. The second transparent film has a flat portion (51) provided at least in the portion facing the non-printed area in the thickness direction, A gap (ΔG) is provided between the standard substance and the flat portion of the second transparent film. Test piece.

5. A test piece (1) for confirming the accuracy of foreign object detection by an X-ray inspection device, A standard substance (2) formed into a predetermined shape, Opaque sheet portion (3) and The system comprises a first transparent film (4) and a second transparent film (5) that house the standard substance and the sheet portion between them, The first transparent film (4) is formed by extruding in the thickness direction and has a concave housing portion (41, 41C) in which the standard substance is contained, The sheet portion is provided with through holes (31) larger than the standard material in the portion facing the housing portion in the thickness direction. The second transparent film has a flat portion (51) provided at least in the portion of the sheet portion facing the through hole in the thickness direction, The inner surface of the aforementioned housing is provided on a spherical surface, The aforementioned standard material is provided in a spherical shape, The radius (r2) of the inner surface of the housing is set to be larger than the radius (r1) of the standard material. Test piece.

6. A test piece (1B) for confirming the accuracy of foreign object detection by an X-ray inspection device, A standard substance (2) formed into a predetermined shape, The system comprises a first transparent film (4) and a second transparent film (5) that contain the aforementioned standard material between them, The first transparent film is formed by extruding in the thickness direction and has a concave housing portion (41, 41C) in which the standard substance is contained, The invention further comprises a printed portion (3B) printed on at least one of the first transparent film and the second transparent film, The printing portion is provided with a non-printing area (31B) that is larger than the standard material in the portion facing the housing portion in the thickness direction. The second transparent film has a flat portion (51) provided at least in the portion facing the non-printed area in the thickness direction, The inner surface of the aforementioned housing is provided on a spherical surface, The aforementioned standard material is provided in a spherical shape, The radius (r2) of the inner surface of the housing is set to be larger than the radius (r1) of the standard material. Test piece.

7. A method for measuring the outer shape of a test piece according to Claims 1 to 6, The external shape of the test piece is measured based on the image of the standard substance taken through the second transparent film. External measurement method.

Images