Test piece and outer shape 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 external shape measuring method. [Background technology]

[0002] X-ray inspection equipment is used to detect foreign objects mixed into food and other objects to be inspected. It is known that test pieces are used to check the foreign object detection accuracy of this X-ray inspection equipment (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 the object to be inspected, and X-ray inspection is performed with the X-ray inspection equipment. The size of detectable foreign objects can be checked based on the appearance (image) of the standard substance in the X-ray transmission image.

[0003] FIG. 4(b) of the above-mentioned Patent Document 1 discloses a multiple-type test piece having a plurality of reference substances, an example of which is shown in FIG. 11. This test piece 100 includes a mount 101, a plurality of spherical reference substances 102 attached in a row on the mount 101, a first transparent film 104 extruded in a hemispherical (or bullet-like) shape in the thickness direction and having a plurality of concave containers 103 formed in a row in which the reference substances 102 are contained, and a flat second transparent film 105. The plurality of reference substances 102 have different outer diameters and are arranged in order of the size of the outer diameters. The inner diameters of the plurality of containers 103 of the first transparent film 104 are determined to correspond to the outer diameters of the reference substances 102, and are arranged in order of the size of the inner diameters. Then, the mount 101 with the reference materials 102 attached is sandwiched between the first transparent film 104 and the second transparent film 105 so that each reference material 102 is contained in the container 103 with the corresponding inner diameter. Next, the outer peripheral edges of the first transparent film 104 and the second transparent film 105 are heat-sealed to integrate them, thereby obtaining a test piece 100 having a structure in which a plurality of reference materials 102 with different outer diameters arranged in order of size are covered with the transparent films 104, 105. Note that the test piece is also available as a single type containing a single reference material. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2009-31149 A Summary of the Invention [Problem to be solved by the invention]

[0005] The test piece is an important tool for checking the accuracy of foreign body detection by the X-ray inspection device. For this reason, the reference material covered with the transparent film must be manufactured accurately so that its outer shape has a predetermined shape, outer diameter, etc. For example, if the reference material is spherical, if the outer diameter of the reference material displayed on the transparent film, etc. differs from the outer diameter of the reference material actually covered with the transparent film, the accuracy of foreign body detection by the X-ray transmission image may not be guaranteed. In addition, if the test piece is the above-mentioned multiple type, the outer diameter of each of the multiple reference materials must be correct and the standard materials must be arranged in order of size. Even if the outer diameters of the multiple reference materials are correct, if the standard materials are arranged in a wrong position and are not arranged in order of size, the image of the reference material shown in the X-ray transmission image may be erroneously evaluated. In this case, too, the accuracy of foreign body detection by the X-ray transmission image may not be guaranteed.

[0006] Therefore, in order to guarantee the accuracy of foreign body detection by X-ray inspection equipment using test pieces, a process is carried out at the time of production to check whether the test pieces are manufactured as regular products. In this case, it is common to check by measuring the external shape from the outside of the transparent film (if the standard material is spherical, the external diameter is measured) after the manufacturing process of the test pieces is completed.

[0007] FIG. 12 is a diagram showing a method of photographing a spherical reference material 102 with a camera from the first transparent film 104 side of the test piece 100 and measuring its outer diameter. In FIG. 12, a camera (not shown) is disposed above the storage section 103 of the test piece 100 with the photographing direction facing downward, and photographs the reference material 102 below through the storage section 103. Light coming from the periphery of the test piece 100 to the reference material 102 is reflected by the reference material 102 in all directions around it, but the camera photographs the reference material 102 by capturing the light reflected upward as indicated by the vertical arrow in the figure. At this time, at least a part of the light reflected by the reference material 102 and heading toward the camera is refracted and its path is changed when passing through the storage section 103 of the first transparent film 104 as indicated by the vertical arrow in the figure, so that the outer diameter of the photographed reference material 102 may be measured as a length DF larger than the actual size. As described above, in the conventional test piece 100, there is a problem in that it is sometimes difficult to accurately measure the outer diameter of the reference material 102 using reflected light.

[0008] FIG. 13 is a diagram showing a method of irradiating light upward from below the second transparent film 105 of the test piece 100, photographing the reference material 102 with a camera arranged facing downward above the storage section 103 of the first transparent film 104, and measuring the outer diameter of the reference material 102. As shown by the upward arrow in FIG. 13(b), the light irradiated upward from below the test piece 100 is photographed by the camera as transmitted light of the test piece 100. At least a part of the transmitted light is refracted and changes its path when passing through the storage section 103 of the first transparent film 104 as shown by the arrow in the figure. Therefore, as shown in FIG. 13(a), the inner edge of the annular shadow S1 generated by the hemispherical storage section 103 of the first transparent film 104 and the outer edge of the circular shadow S2 generated by the reference material 102 may overlap each other, making it difficult to recognize the outer edge or contour of the reference material 102 from the image. As described above, in the conventional test piece 100, there is a problem in that it is sometimes difficult to accurately measure the outer diameter of the reference material 102 using transmitted light.

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

[0010] In order to achieve the above-mentioned object, a test piece and a shape measuring method according to the present invention are characterized by the following [1] to [7]. [1] A test piece (1) for verifying the accuracy of foreign object detection by an X-ray inspection device, A standard substance (2) formed into a predetermined shape; An opaque sheet portion (3); a first transparent film (4) and a second transparent film (5) for housing the reference material and the sheet portion therebetween; The first transparent film (4) is extruded in a thickness direction and has a concave containing portion (41, 41C) in which the reference substance is contained, The sheet portion has a through hole (31) larger than the reference material in a portion facing the storage 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. It is a test piece. [2] A test piece (1B) for verifying the accuracy of foreign object detection by an X-ray inspection device, A standard substance (2) formed into a predetermined shape; A first transparent film (4) and a second transparent film (5) that accommodate the reference material therebetween, the first transparent film is extruded in a thickness direction and has a concave containing portion (41, 41C) in which the reference substance is contained; Further comprising a printed portion (3B) printed on at least one of the first transparent film and the second transparent film, The printing section has a non-printing area (31B) larger than the reference material in a portion facing the storage section in the thickness direction, The second transparent film has a flat portion (51) provided at least in a portion facing the non-printed area in the thickness direction. It is a test piece. [3] In the test piece according to [1] or [2], The standard substance is adhered to the receiving portion of the first transparent film. It is a test piece. [4] In the test piece according to [1] or [2], A gap (ΔG) is provided between the standard substance and the flat portion of the second transparent film. It is a test piece. [5] In the test piece according to [1] or [2], The inner surface of the housing portion is provided as a spherical surface, The standard material is provided in a spherical shape, The radius (r2) of the inner surface of the container is set to be larger than the radius (r1) of the reference material. It is a test piece. [6] In the test piece according to [1] or [2], The area of ​​the reference material in contact with the inner surface of the container is set to be half or less of the total surface area of ​​the reference material. It is a test piece. [7] A method for measuring the outer shape of a test piece according to [1] or [2], measuring the outer shape of the test piece based on the image of the standard material taken through the second transparent film; It is an external measurement method.

[0011] According to the configuration of [1] above, when the test piece is photographed from the second transparent film side, the standard substance can be photographed through the flat portion of the second transparent film and the through hole of the sheet portion. 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 external shape of the standard substance can be measured with high accuracy. According to the above configuration [2], when the test piece is photographed from the second transparent film side, the standard substance can be photographed through the flat portion and non-printed area of ​​the second transparent film. Therefore, the light passing through the flat portion of the second transparent film is incident on the camera without being refracted at the flat portion, so that the external shape of the standard substance can be measured with high accuracy. According to the above configuration [3], the reference material can be fixed by adhesion to the container. Since the reference material is not adhered to the second transparent film, adhesive is not applied to the flat portion. Therefore, the image of the reference material taken by the camera is not distorted by the adhesive, and the external shape of the reference material can be measured with high accuracy. According to the above configuration [4], a gap is provided between the reference material and the flat portion of the second transparent film, so that the reference material does not come into contact with the flat portion and is not photographed by the camera in a distorted state. This makes it possible to measure the external shape of the reference material with even greater accuracy. According to the above-mentioned configuration [5], the radius of the inner surface of the container is set to be larger than the radius of the reference material. This makes it possible to reduce the contact area between the container and the reference material, so that the container does not interfere with the recognition of the contour of the reference material in the image captured by the camera, and the outline of the reference material can be measured with higher accuracy. According to the above-mentioned configuration [6], the contact area of ​​the reference material with the inner surface of the container is set to be equal to or less than half of the total surface area of ​​the reference material. Therefore, in the image captured by the camera, the container does not interfere with the recognition of the outline of the reference material, and the outline of the reference material can be measured with higher accuracy. According to the configuration [7] above, by photographing the test piece from the second transparent film side, it is possible to photograph the standard substance through the flat portion of the second transparent film and the through hole of the sheet portion. Therefore, the light passing through the flat portion of the second transparent film is incident on the camera without being refracted at the flat portion, so that the external shape of the standard substance can be measured with high accuracy. Effect of the Invention

[0012] According to the present invention, it is possible to provide a test piece and a shape measurement method that can accurately measure the outer shape of a reference 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 reading the following description of the embodiment of the present invention (hereinafter, referred to as "embodiment") with reference to the accompanying drawings. [Brief description of the drawings]

[0014] [Figure 1] FIG. 1 is a top view of a test piece according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is a schematic cross-sectional view taken along line AA in FIG. [Diagram 3] FIG. 3 is a partial perspective view of the mount shown in FIG. [Figure 4] FIG. 4 is a partially enlarged view of FIG. [Diagram 5] FIG. 5 is a manufacturing process diagram of the lower transparent film constituting the test piece shown in FIGS. [Figure 6] FIG. 6 is a manufacturing process diagram of the test piece shown in FIGS. [Figure 7] FIG. 7 is a top view of a test piece according to the second embodiment of the present invention. [Figure 8] FIG. 8 is a schematic cross-sectional view taken along line BB in FIG. [Figure 9] FIG. 9 is a diagram showing a modified example of the lower transparent film in the first and second embodiments. [Figure 10]FIG. 10 is a schematic cross-sectional view taken along line BB in FIG. 7 in a modified example of the second embodiment. [Figure 11] FIG. 11 is a cross-sectional view showing an example of a conventional test piece. [Figure 12] FIG. 12 is a cross-sectional view for explaining the conventional measurement of the outside diameter of a standard material using reflected light. [Figure 13] FIG. 13 is a cross-sectional view for explaining the conventional measurement of the outer diameter of a standard material using transmitted light. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

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

[0016] For convenience of explanation, "front", "rear", "left", "right", "upper" and "lower" are defined as shown in Figs. 1 to 3. The "front-rear direction", "left-right direction" and "upper-lower direction" are mutually perpendicular. The upper-lower direction corresponds to the "thickness direction" of the present invention.

[0017] (First embodiment) First, a test piece 1 of the first embodiment will be described with reference to Fig. 1 to Fig. 4. The test piece 1 shown in Fig. 1 to Fig. 4 is a multiple type having a plurality of (five in the example shown in Fig. 1) reference materials 2. As shown in Fig. 1 and Fig. 2, the test piece 1 includes a plurality of reference materials 2 formed into spherical shapes, an opaque, flat mount 3 (sheet portion), and a lower transparent film 4 (first transparent film) and an upper transparent film 5 (second transparent film) that accommodate the reference materials 2 and the mount 3 by sandwiching them between each other.

[0018] The reference materials 2 have different outer diameters and are arranged in the left-right direction in the order of the size of the outer diameter. The mount 3 is provided in a generally rectangular shape that is long in the arrangement direction (left-right direction) of the reference materials 2. In this embodiment, the mount 3 is provided with a plurality of through holes 31 in the portions that face the reference materials 2 in the up-down direction. As shown in Figs. 2 and 3, the plurality of through holes 31 are provided penetrating in the up-down direction. As shown in Fig. 1, the same number of through holes 31 as the reference materials 2 are provided and arranged in the left-right direction. In this embodiment, the through holes 31 are provided in a circular shape in top view of the same size and shape. The inner diameter of the through hole 31 is set larger than the outer diameter of the rightmost reference material 2 that has the largest outer diameter among the reference materials 2. In addition, information such as the material and outer diameter of the reference material 2 is printed on the upper and lower surfaces of the mount 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 formed in a substantially rectangular shape that is slightly larger than the mount 3. As shown in FIG. 2, the lower transparent film 4 is extruded downward and has a plurality of concave storage sections 41 in which the reference material 2 is respectively stored. The plurality of storage sections 41 are arranged side by side in the left-right direction. In this embodiment, the storage section 41 is extruded into a hemispherical shape, and as shown in FIG. 4, the radius r2 of the inner surface of the spherical storage section 41 is set to be larger than the radius r1 of the reference material 2 to be stored.

[0020] In this embodiment, the radius r2 of the inner surface of the storage section 41 is set to match the radius r1 of the stored reference material 2. That is, the multiple storage sections 41 have inner surface radii r2 different from one another, and are arranged side by side in the left-right direction in the order of the size of the radii r2.

[0021] In this embodiment, the reference material 2 is adhered to the lowest position on the inner surface of the concave storage section 41 with an adhesive 6. In this embodiment, the upper transparent film 5 is provided flat as a whole. As a result, the portion of the upper transparent film 5 that faces the through-hole 31 in the vertical direction becomes a flat portion 51. In addition, a gap ΔG is provided between the reference material 2 and the flat portion 51 of the upper transparent film 5.

[0022] The reference material 2 is adhered to the storage section 41 of the lower transparent film 4, and the mount 3 is sandwiched between the lower transparent film 4 and the upper transparent film 5 with the through hole 31 of the mount 3 and the reference material 2 facing each other in the vertical direction. The lower transparent film 4 and the upper transparent film 5 are then heat-sealed at their outer peripheral edges to form a single unit, thereby obtaining the test piece 1.

[0023] In this embodiment, the reference material 2 is adhered to the lowest position of the inner surface of the concave storage section 41 by the adhesive 6. The test piece 1 is ideally arranged so that the center of the through hole 31 of the mount 3, the lowest position of the storage section 41, and the center of the reference material 2 are aligned in the vertical direction. However, in reality, the lowest position of the storage section 41 and the center of the through hole 31 are not aligned in the vertical direction but are shifted, resulting in a manufacturing error. The through hole 31 is provided larger than the reference material 2 by more than this manufacturing error. As a result, even if a manufacturing error occurs, the reference material 2 can be seen through the upper transparent film 5 and the through hole 31.

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

[0025] As shown in Fig. 5(b), the heated and softened flat lower transparent film 4 is placed on the mold 23 of the vacuum forming device 20. The suction device is operated to generate negative pressure in the cavity 24 as shown by the arrow. The softened lower transparent film 4 is attached to the mold 23 by the negative pressure generated in the cavity 24.

[0026] As shown in FIG. 5(c), after a predetermined forming time under negative pressure has elapsed, the lower transparent film 4 made of resin and formed into the shape of the mold 23 is removed from the mold 23 of the vacuum forming device 20.

[0027] Next, the reference material 2 is adhered to the storage section 41 of the lower transparent film 4. Next, as shown in Fig. 6(a), the mount 3 is sandwiched between the lower transparent film 4 and the upper transparent film 5. At this time, the mount 3 and the reference material 2 are sandwiched so that the through-holes 31 provided in the mount 3 and the reference material 2 face each other in the vertical direction. As shown in Fig. 6(b), the outer peripheral edges of the lower transparent film 4 and the upper transparent film 5 are clamped and heat-sealed by a thermocompression device 30 to obtain the test piece 1 of the first embodiment.

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

[0029] FIG. 2 is a diagram showing a method of measuring the outer diameter of the 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 FIG. 2, the camera 40 is disposed above the container 41 of the test piece 1 with the photographing direction facing downward, and photographs the standard material 2 from above through the flat portion 51 of the standard material 2 and the through hole 31 of the mount 3. Light coming from the periphery of the test piece 1 to the standard material 2 is reflected by the standard material 2 in all directions, but the camera 40 captures the light reflected upward as indicated by the arrow in the figure to photograph the standard material 2. At this time, the light reflected by the standard material 2 and heading toward the camera 40 passes only through the flat portion 51 of the upper transparent film 5 as indicated by the arrow in the figure, so that the outer diameter D of the photographed standard material 2 is the actual size, and the outer diameter D of the standard material 2 can be measured with high accuracy by photographing using reflected light.

[0030] According to the above-described embodiment, the mount 3 is provided with a through hole 31 larger than the reference material 2 in a portion facing the storage section 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 a portion facing the through hole 31 of the mount 3 in the vertical direction. As a result, when the test piece 1 is photographed from the upper transparent film 5 side, the reference material 2 can be photographed through the flat portion 51 of the upper transparent film 5 and the through hole 31 of the mount 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 at the flat portion 51, so that the outer diameter D of the reference material 2 can be measured with high accuracy.

[0031] According to the embodiment described above, the reference material 2 is adhered to the accommodation portion 41 of the lower transparent film 4. This allows the reference material 2 to be fixed inside the accommodation portion 41. Since the reference 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 reference material 2 captured by the camera 40 is not distorted by the adhesive, and the outer diameter D of the reference material 2 can be measured with high accuracy.

[0032] According to the embodiment described above, a gap ΔG is provided between the reference material 2 and the flat portion 51 of the upper transparent film 5. This prevents the reference material 2 from coming into contact with the flat portion 51 and being photographed by the camera 40 in a distorted state, allowing the outer diameter D of the reference material 2 to be measured with even greater accuracy.

[0033] According to the embodiment described above, the inner surface of the container 41 is spherical, the reference material 2 is spherical, and the radius r2 of the inner surface of the container 41 is larger than the radius r1 of the reference material 2. This makes it possible to reduce the contact area between the container 41 and the reference material 2, so that in the image captured by the camera 40, the container 41 does not interfere with recognition of the contour of the reference material 2, and the outer diameter D of the reference material 2 can be measured with even greater accuracy.

[0034] Second embodiment Next, the test piece 1B of the second embodiment will be described with reference to Figs. 7 and 8. In Figs. 7 and 8, the same parts as those of the test piece 1 shown in Figs. 1 and 2 described in the first embodiment above are denoted by the same reference numerals, and detailed description thereof will be omitted. As shown in the figures, the test piece 1B includes a reference material 2, a lower transparent film 4, an upper transparent film 5, and an opaque printed portion 3B printed on the upper transparent film 5. In the second embodiment, the mount 3 is not accommodated between the lower transparent film 4 and the upper transparent film 5. The printed portion 3B has information such as the material and outer diameter of the reference material 2 printed thereon. To explain in detail, in this embodiment, the printed portion 3B has an information portion (such as letters and numbers) that represents information such as the material and outer diameter of the reference material 2, and an opaque background portion that is the background of this information. In this embodiment, the background portion of the printed portion 3B is provided on the entire surface except for the peripheral portion of the upper transparent film 5 and a non-printed region 31B described later.

[0035] The reference material 2, the lower transparent film 4, and the upper transparent film 5 are the same as those in the first embodiment described above, and therefore a detailed description thereof will be omitted here. In this embodiment, the printed portion 3B is provided on the lower surface of the upper transparent film 5, in a rectangular area that is slightly smaller than the upper transparent film 5. The printed portion 3B has a non-printed area 31B that is larger than the reference material 2 in a portion that corresponds vertically to the storage portion 41. The non-printed areas 31B are provided in the same number as the reference materials 2, and are arranged side by side in the left-right direction.

[0036] In this embodiment, the non-printed regions 31B are arranged in a circular shape in top view with the same size and shape. The inner diameter of the non-printed region 31B is set larger than the outer diameter of the rightmost standard material 2, which has the largest diameter among the standard materials 2. The test piece 1B of the second embodiment is ideally arranged so that the center of the non-printed region 31B, the lowest position of the storage section 41, and the center of the standard material 2 are aligned in the vertical direction. However, in reality, the lowest position of the storage section 41 and the center of the non-printed region 31B are not aligned in the vertical direction but are shifted, resulting in a manufacturing error. The non-printed region 31B is set larger than the standard material 2 by more than this manufacturing error. As a result, even if a manufacturing error occurs, the standard material 2 can be seen through the upper transparent film 5 and the non-printed region 31B. In addition, the diameter of the standard material 2 is displayed on the printed portion 3B.

[0037] As described above, the printed portion 3B has a non-printed region 31B larger than the reference material 2 in a portion that faces the storage portion 41 of the lower transparent film 4 in the vertical direction, and the upper transparent film 5 has a flat portion 51 in a portion that faces the non-printed region 31B in the vertical direction. As a result, when the test piece 1 is photographed from the upper transparent film 5 side, the reference material 2 can be photographed through the upper transparent film 5 and the non-printed region 31B. Therefore, the light that has passed through the flat portion 51 of the upper transparent film 5 enters the camera 40 without being refracted by the flat portion 51, so that the outer diameter D of the reference material 2 can be measured with high accuracy.

[0038] (Modifications of the first and second embodiments) Next, a modified example of the first and second embodiments described above will be described with reference to FIG. 9. In the first and second embodiments, the storage section 41 is provided in a hemispherical shape, but this is not limited thereto. The test piece 1, 1B may have a storage section 41C shown in FIG. 9 instead of the storage section 41 described in the first and second embodiments. As shown in the figure, the storage section 41C has a spherical section 41C1 provided at the bottom and a conical section 41C2 provided in a conical shape above the spherical section 41C1. The inner diameter r3 of the inner surface of the spherical section 41C1 is equal to the radius r1 of the reference material 2. This allows the lower side of the reference material 2 to fit snugly into the spherical section 41C1. In this embodiment, the reference material 2 is not bonded to the lower transparent film 4. Even if the reference material 2 is not bonded to the lower transparent film 4, when the lower transparent film 4 is turned downward, the lower side of the reference material 2 fits snugly into the spherical section 41C1, and the position of the reference material 2 is determined.

[0039] In this case, the spherical portion 41C1 is provided so that the contact angle θ between the reference material 2 and the container 41C is 180 degrees or less. By setting the contact angle θ to 180 degrees or less in this manner, the area of ​​the reference material 2 in contact with the inner surface of the container 41C is half or less of the total surface area of ​​the reference material 2. This makes it possible to measure the outer diameter D of the reference material 2 with even greater accuracy, without the container 41C interfering with the recognition of the contour of the reference material 2 in the image captured by the camera 40.

[0040] (Modification of the second embodiment) Next, a modified example of the second embodiment will be described with reference to Fig. 10. In Fig. 10, parts equivalent to those of the test piece 1B shown in Fig. 8 already described in the second embodiment will be given the same reference numerals, and detailed description thereof will be omitted. In the second embodiment, the printed portion 3B is provided on the lower surface of the upper transparent film 5, but this is not limited thereto. In the test piece 1D shown in Fig. 10, the printed portion 3D is provided on the upper surface of the lower transparent film 4. In this case, since the printed portion 3D cannot be provided in the storage portion 41 due to manufacturing reasons, the non-printed area 31D is provided to be larger than the storage portion 41.

[0041] The present invention is not limited to the above-described embodiment, and can be appropriately modified, improved, etc. In addition, the material, shape, size, number, arrangement location, etc. of each component in the above-described embodiment are arbitrary as long as the present invention can be achieved, and are not limited.

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

[0043] According to the embodiment described above, the reference material 2 is adhered to the lower transparent film 4, but this is not limited to this. The reference material 2 does not have to be adhered to either the lower transparent film 4 or the upper transparent film 5.

[0044] In the above-described first and second embodiment modifications, the inner radius r3 of the spherical portion 41C1 is set to be equal to the radius r2 of the reference material 2, but this is not limited thereto. The inner radius r3 of the spherical portion 41C1 may be set to be larger than the radius r2 of the reference material 2.

[0045] In the above-described embodiment, the reference material 2 is provided in a spherical shape, but is not limited thereto. The reference material 2 may be provided in a predetermined shape, and may not be spherical. In the above-described embodiment, the outer diameter of the spherical reference material 2 is measured as the outer shape of the reference material 2, but is not limited thereto. The shape or size of the reference material 2 may be measured as the outer shape of the reference material 2.

[0046] In the above-described first embodiment, the mount 3 is used as the sheet portion, but the present invention is not limited to this. The sheet portion may 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 printed portion 3B was provided on the lower surface of the upper transparent film 5, but it may 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. Also, in the modified example of the second embodiment, the printed portion 3D was provided on the upper surface of the lower transparent film 4, but it may 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. Mount (sheet part) 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 verifying the accuracy of foreign object detection by an X-ray inspection device, A standard material (2) formed into a predetermined shape; An opaque sheet portion (3); a first transparent film (4) and a second transparent film (5) for housing the reference material and the sheet portion therebetween; The first transparent film (4) is extruded in a thickness direction and has a concave containing portion (41, 41C) in which the reference substance is contained, The sheet portion has a through hole (31) larger than the reference material in a portion facing the storage 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. 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; a first transparent film (4) and a second transparent film (5) that accommodate the reference material therebetween; The first transparent film is extruded in a thickness direction and has a concave containing portion (41, 41C) in which the reference substance is contained, Further comprising a printed portion (3B) printed on at least one of the first transparent film and the second transparent film, The printing section has a non-printing area (31B) larger than the reference material in a portion facing the storage section in the thickness direction, The second transparent film has a flat portion (51) provided at least in a portion facing the non-printed area in the thickness direction. Test piece.

3. The test piece according to claim 1 or 2, The standard substance is adhered to the receiving portion of the first transparent film. Test piece.

4. The test piece according to claim 1 or 2, A gap (ΔG) is provided between the standard material and the flat portion of the second transparent film. Test piece.

5. The test piece according to claim 1 or 2, The inner surface of the housing portion is provided as a spherical surface, The standard material is provided in a spherical shape, The radius (r2) of the inner surface of the container is set to be larger than the radius (r1) of the reference material. Test piece.

6. The test piece according to claim 1 or 2, The area of ​​the reference material in contact with the inner surface of the container is set to be half or less of the total surface area of ​​the reference material. Test piece.

7. A method for measuring the outer shape of the test piece according to claim 1 or 2, comprising the steps of: measuring the outer shape of the test piece based on the image of the standard material taken through the second transparent film; External measurement method.

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