Test piece

Abstract

To provide a test piece capable of accurately measuring an outer diameter of a reference material covered by a translucent cover.SOLUTION: A test piece 1 has a reference material 2 fixed to a mount 3, and a translucent upper cover 5 and a translucent lower cover 6 covering the mount 3 and the reference material 2. The upper cover 5 has a flat part 7 larger than the reference material 2 in plan view when viewed from a measurement direction, and a side periphery part 8 continuous to an outer periphery of the flat part 7. The reference material 2 is fixed at a middle position separated from the side periphery part 8. When an outer shape of the reference material is measured by reflected light, the outer shape of the reference material 2 can be accurately measured since light reflected by the reference material transmits through the side periphery part 8, transmits only through the flat part 7 without being deflected, and travels straight (Fig.4).SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a test piece for confirming the accuracy of foreign object detection by an X-ray inspection apparatus, which has a structure in which a standard substance is covered with a translucent cover, and particularly relates to a test piece capable of accurately measuring the outer shape of the standard substance from outside the cover.

Background Art

[0002] In the operation of detecting foreign objects mixed in an object to be inspected by an X-ray inspection apparatus, a test piece is used to confirm the detection accuracy of the foreign objects. Specifically, a test piece having a structure in which a standard substance of a predetermined material and outer shape (shape, outer diameter, etc.) is covered with a translucent cover is attached to the object to be inspected, and an X-ray inspection is performed with an X-ray inspection apparatus. The size of the detectable foreign objects can be confirmed by the appearance (imaging) of the standard substance in the X-ray transmission image.

[0003] The invention of such a test piece is disclosed in Patent Document 1 below. This test piece (test body 10 in Patent Document 1) includes a plurality of spherical standard substances (sample 11a, etc. in Patent Document 1) having various outer diameters, and a translucent cover (laminate films 13a, 13b in Patent Document 1) covering these standard substances.

[0004] The test piece disclosed in Patent Document 1 below is a multi-unit type having multiple standard materials, an example of which is shown in Figure 9. This test piece 100 comprises a base 101, multiple spherical standard materials 102 mounted in a row on the base 101, an upper cover 104 with multiple hemispherical (or bullet-shaped) housing sections 103 formed in a row to cover each standard material 102, and a flat lower cover 105. The multiple standard materials 102 have different outer diameters and are arranged in order of increasing outer diameter. The multiple housing sections 103 of the upper cover 104 have inner diameters that correspond to the outer diameters of each standard material 102 and are arranged in order of increasing inner diameter. Then, by sandwiching the cardboard backing 101 with the standard material 102 attached between the upper cover 104 and the lower cover 105 so that each standard material 102 is housed in a corresponding housing 103 of the same inner diameter, and by heat-sealing the outer edges of the upper cover 104 and the lower cover 105 to integrate them, a test piece 100 is obtained in which multiple standard materials 102 of different outer diameters arranged in order of size are covered by the covers 104 and 105.

[0005] There are also single-piece test pieces, one example of which is shown in Figure 10. As shown in Figure 10, the single-piece test piece 200 comprises a base 201, a spherical standard material 202 mounted on the base 201, an upper cover 204 with a hemispherical (or bullet-shaped) housing 203 covering the standard material 202, and a flat lower cover 205. The upper cover 204 and the lower cover 205 are integrated at their outer edges with the base 201 in between.

[0006] When manufacturing a single-piece test piece 200, as shown in Figure 11(a), the base 201 with the standard material 200 attached is placed on the lower cover 205, the upper cover 204 is placed over the base 201 so that the standard material 202 is covered by the housing 203, and as shown in Figure 11(b), the outer edges of the upper cover 204 and the lower cover 205 are clamped and heat-sealed with a heating and sealing device 300. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Patent Application No. 2020-46342 [Overview of the Initiative] [Problems that the invention aims to solve]

[0008] Test pieces are an important tool for verifying the accuracy of foreign object detection by X-ray inspection equipment. Therefore, the standard material covered by the cover must be manufactured precisely so that its outer shape, outer diameter, etc., is a predetermined shape. For example, if the standard material is spherical, and the outer diameter of the standard material indicated on the cover or backing differs from the outer diameter of the standard material actually covered by the cover, 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 diameter 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 on the backing, 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, and in this case as well, it may become impossible to guarantee the accuracy of foreign object detection using X-ray transmission images.

[0009] Therefore, in order to guarantee the accuracy of foreign object detection using X-ray inspection equipment with test pieces, a process to confirm that the test pieces are manufactured as genuine products is carried out at the time of manufacture. In this case, it is common practice to heat-seal the outer edges of the upper and lower covers that cover the standard material, and then, after the manufacturing process of the test piece is completed, to measure the outer diameter of the standard material from the outside of the cover to confirm this.

[0010] Figure 12 shows a method for measuring the outer diameter of a standard material 202 by photographing it with a camera from the side of the upper cover 204 of the test piece 200. In Figure 12, a camera (not shown) is positioned above the housing 203 of the test piece 200 with its shooting direction facing downwards, and photographs the standard material 202 below through the housing 203. Light coming to the standard material 202 from around the test piece 200 is reflected by the standard material 202 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 202. At this time, at least a portion of the light reflected by the standard material 202 and heading towards the camera is refracted as it passes through the housing 203 of the upper cover 204, as indicated by the vertical arrows in the figure, and its path changes, so the outer diameter of the photographed standard material 202 was sometimes measured as a length DF that was larger than the actual size. Thus, a problem existed in that it was sometimes difficult to accurately measure the outer diameter of the standard material 202 using reflected light with the conventional test piece 200.

[0011] Figure 13 shows a method for measuring the outer diameter of a standard material 202 by irradiating light upward from below the lower cover 205 of the test piece 200, and photographing the standard material 202 with a camera positioned downward above the housing 203 of the upper cover 204. In Figure 13(b), as indicated by the upward arrow, the light irradiated upward from below the test piece 200 is photographed by the camera as transmitted light from the test piece 200. Here, at least a portion of the transmitted light is refracted and its path changes as it passes through the housing 203 of the upper cover 204, 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 203 of the upper cover 204 and the outer edge of the circular shadow S2 generated by the standard material 202 may overlap, making it difficult to recognize the outer edge or contour of the standard material 202 from the image. Thus, with conventional test pieces 200, there was a problem in that it was sometimes difficult to accurately measure the outer diameter of the standard material 202 using transmitted light.

[0012] Therefore, it is conceivable to measure the outer diameter of the standard material during the manufacturing process of the test piece, rather than after the manufacturing process is completed. For example, it is conceivable to directly photograph the standard material placed on a backing sheet with a camera in the step before the upper and lower covers are heat-sealed. However, this would not only add one step to the manufacturing process, but would also require rearranging the manufacturing line to insert an inspection step in the middle of the normal manufacturing process. Furthermore, handling and transporting the standard material, which is in the process of being manufactured and not covered by a cover, would require special consideration to prevent loss, mix-ups, and contamination of the standard material, which is expected to be extremely complicated.

[0013] Next, even with properly manufactured test pieces, it may be necessary to periodically (for example, once a year) verify whether the standard material of the test piece used in foreign object inspection using an X-ray inspection device has an outer diameter that conforms to the inspection standard. In such cases, as explained with reference to Figures 12 and 13, the outer diameter of the standard material 202 is measured through the cover using reflected or transmitted light to confirm whether it conforms to the standard. However, as mentioned above, the light is refracted by the housing portion 203 of the upper cover 204, so even in this case, there was a problem in that accurate measurement could be difficult.

[0014] The present invention was made to solve the problems of the conventional technology described above, and aims to provide a test piece that can accurately measure the outer diameter of a standard material covered with a translucent cover. [Means for solving the problem]

[0015] Test piece 1 described in claim 1 ,2 1,31 is, Test piece 1 for verifying the accuracy of foreign object detection using an X-ray inspection device. ,2 1,31, A standard material 2 formed in a predetermined shape using a predetermined material, A housing portion 4 that covers the reference substance 2 is formed, and translucent covers 5, 6 are provided with a flat portion 7 that is circular in a plan view and larger than the reference substance 2 on the upper surface of the housing portion. comprising death, The size of the flat portion 7 as viewed from a measurement direction intersecting the flat portion 7 is larger than the outer shape of the standard material 2 as viewed from the measurement direction. The standard material 2 is fixed at a position spaced apart from the side circumferential portion 8 which is continuous with the outer circumference of the flat portion 7. It is characterized by this.

[0018] Claim 2 The test pieces 1, 21, 31 described in claim 1 In the test piece described in claim The reference substance 2 is fixed at the center of the side peripheral portion 8, which is characterized.

[0019] Claim 3 The test pieces 1, 21, 31 described in claim 2 In the test piece described in claim The covers 5, 6 are composed of a flat plate-shaped first member 6 and a second member 5 in which the side peripheral portion 8 and the flat portion 7 are formed, which is characterized.

[0020] Claim 4 The test pieces 1, 31 described in claim 3 In the test piece described in claim Further having a base body 3 sandwiched between the first member 6 and the second member 5 so as to face the flat portion 7; the reference substance 2 is fixed to the base body 3, which is characterized. <00​​​​​​​​​​​​​​​​​​​

[0022] According to the test piece described in claim 1, a portion of the cover that covers the standard material is provided with a flat portion larger than the standard material. Therefore, a configuration can be adopted in which the standard material is placed inside the outer edge of the flat portion, thereby enabling accurate measurement of the outer shape of the standard material. Furthermore, because the size of the flat area as viewed from the measurement direction is larger than the outer shape of the standard material as viewed from the measurement direction, a configuration can be adopted in which the standard material is positioned so that a gap is created between the outer edge of the flat area and the standard material, thereby enabling accurate measurement of the outer shape of the standard material. Furthermore, the standard material is fixed in an inward position away from the surrounding periphery that encloses the flat area. Therefore, when measuring the outline of the standard material using reflected light, the light reflected by the standard material passes through only the flat area without refracting after passing through the periphery, allowing for accurate measurement of the standard material's outline. Also, when measuring the outline of the standard material using transmitted light, the shadow of the standard material and the shadow of the periphery are separated by annular light that passes between the standard material and the periphery and through the flat area, and do not overlap. As a result, the outer edge or contour of the standard material can be accurately recognized from the image, and its outline can be accurately measured.

[0025] Claim 2 According to the test piece described, the standard material is fixed in the center of the side circumference, so the shadow of the standard material and the shadow of the side circumference are separated by annular light that passes between the standard material and the side circumference, through the flat surface and travels in a straight line, and do not overlap. Therefore, the outer edge or contour of the standard material can be accurately recognized from the image, and the external shape of the standard material can be accurately measured.

[0026] According to the test piece described in claim 3, 2 The effects demonstrated by the test piece described can be easily achieved with a simple configuration consisting of a flat first member and a flat second member with a side circumference and a flat portion, resulting in a small number of parts.

[0027] Claim 4 According to the test piece described, since the standard material is fixed to the substrate, the standard material can be easily positioned in the center of the side circumference simply by sandwiching the substrate between the first and second members, making it easy to handle the standard material, which is a relatively small component.

[0028] Claim 5According to the test piece described, since the standard material is directly fixed to the first member, a third member is not required to fix the standard material between the first and second members, allowing the test piece to be constructed with fewer parts. Furthermore, when measuring the outer diameter of the standard material with transmitted light, since the only members through which light passes are the standard material and the first and second members, the contrast between the shadow of the standard material and the shadow of its side circumference obtained by imaging becomes stronger, making the outer edge or contour of the standard material clearer and allowing for more accurate measurement of the outer diameter of the standard material. [Brief explanation of the drawing]

[0029] [Figure 1] This is a cross-sectional view of a test piece of the first embodiment. [Figure 2] This is a manufacturing process diagram for the second component that constitutes the test piece of the first embodiment. [Figure 3] This is a manufacturing process diagram of a test piece of the first embodiment. [Figure 4] This is a cross-sectional view illustrating the measurement of the external shape of a standard material using reflected light in a test piece of the first embodiment. [Figure 5] This is a cross-sectional view illustrating the measurement of the external shape of a standard material using transmitted light in a test piece of the first embodiment. [Figure 6] This is a cross-sectional view illustrating the measurement of the external shape of a standard material using transmitted light in a test piece of a modified example of the first embodiment. [Figure 7] This is a manufacturing process diagram of a test piece of the second embodiment. [Figure 8] This is a cross-sectional view of a test piece of the third embodiment. [Figure 9] This is a cross-sectional view of a conventional multi-piece test specimen. [Figure 10] This is a cross-sectional view of a conventional test piece, which is a single-piece type. [Figure 11] This is a diagram illustrating the manufacturing process for conventional test pieces, which are single-piece units. [Figure 12]This is a cross-sectional view illustrating the measurement of the external shape of a standard material using reflected light in a conventional single-piece test piece. [Figure 13] This is a cross-sectional view illustrating the measurement of the external shape of a standard material using transmitted light in a conventional multi-piece test specimen. [Modes for carrying out the invention]

[0030] Embodiments of the present invention will be described below with reference to Figures 1 to 8. The components of the embodiments shown in each drawing do not necessarily faithfully represent the exact same configuration as the actual objects, and may be schematically represented to ensure consistency with the description in the specification. Furthermore, the dimensional ratios of each component do not necessarily match the actual dimensional ratios.

[0031] The test piece 1 of the first embodiment will be described with reference to Figures 1 to 5. The structure of the test piece 1 of the first embodiment will be described with reference to Figure 1. Figure 1 is a cross-sectional view of a test piece 1 of the first embodiment. This test piece 1 is a single-piece type with one standard substance 2. As shown in Figure 1, this test piece 1 comprises a flat plate-shaped base 3, a spherical standard substance 2 attached to the base 3 by fixing means such as an adhesive (not shown), an upper cover 5 as a second member with a housing portion 4 that covers the test piece 1, and a lower cover 6 as a first member which is substantially flat. The upper cover 5 and the lower cover 6 are integrated at the outer edge of the base 3, sandwiching the outer circumference, and covering the standard substance 2.

[0032] As shown in Figure 1, the housing section 4 of the upper cover 5 has a flat section 7 on its upper surface. The flat section 7 is approximately parallel to the flat portion of the lower cover 6 other than the housing section 4, and its shape is circular in plan view (a downward line of sight parallel to the plane of the paper in Figure 1). The housing section 4 of the upper cover 5 has a side circumference section 8 that is formed continuously around the outer circumference of this flat section 7. The side circumference section 8 is the part that connects the flat portion of the lower cover 6 other than the housing section 4 to the flat section 7. Therefore, the housing section 4 of the upper cover 5 has a frustoconical shape as a whole.

[0033] In Figure 1, when measuring the outer diameter of standard material 2 by photographing it with a camera, the measurement direction (shooting direction) is perpendicular to the plane of the flat section 7, that is, the downward direction parallel to the plane of the paper in Figure 1. When viewed from this measurement direction, the outer and inner diameters of the flat section 7 are sufficiently larger than the outer diameter of standard material 2 as viewed from the measurement direction. Furthermore, standard material 2 is fixed at approximately the center of the circumferential side section 8. Therefore, standard material 2 is spaced apart from the side section 8, and a sufficient distance is provided between standard material 2 and the side section 8. Here, the word "sufficient" in the above explanation means that the side section 8 and standard material 2 are separated enough that, in the measurement of the outer diameter of standard material 2 described later, the shadow of the side section 8 and the shadow of standard material 2 can be photographed separately. The distance between standard material 2 and the flat section 7 is also about the same as the distance between standard material 2 and the side section 8.

[0034] The manufacturing process of the test piece 1 of the first embodiment will be described with reference to Figures 2 and 3. As shown in Figure 2(a), the upper cover 5, made of resin that has been softened by heating with any heating means, is molded using a vacuum forming apparatus 10. The vacuum forming apparatus 10 has a mold 13 consisting of a frustoconical projection 11 corresponding to the housing portion 4 of the upper cover 5, and a flat plate portion 12 continuous with the projection 11. The inside of the projection 11 is a cavity 14, and a through hole 15 communicating with the cavity 14 is formed on the upper surface of the projection 11. One end of a suction tube 16 communicating with the cavity 14 is connected to the flat plate portion 12, and a suction device (not shown) is connected to the other end of the suction tube 16.

[0035] As shown in Figure 2(b), the heated and softened upper cover 5 made of resin is placed over the mold 13 of the vacuum forming apparatus 10. The suction device is activated to generate negative pressure in the cavity 14 as indicated by the arrow. The softened upper cover 5 made of resin adheres to the mold 13 due to the negative pressure generated in the cavity 14.

[0036] As shown in Figure 2(c), after a predetermined molding time has elapsed under negative pressure, the resin upper cover 5, which has been molded into the shape of the mold 13, is removed from the mold 13 of the vacuum forming apparatus 10.

[0037] As shown in Figure 3(a), the base 3 with the standard substance 2 attached is placed approximately in the center of the upper surface of the lower cover 6, the upper cover 5 is placed over the base 3 so that the standard substance 2 is covered by the housing 4, and as shown in Figure 3(b), the outer edges of the upper cover 5 and the lower cover 6 are clamped and heat-sealed with a heat-sealing device 300 to obtain the test piece 1 of the first embodiment.

[0038] The measurement of the outer diameter of the standard substance 2 in the test piece 1 of the first embodiment will be described with reference to Figures 4 and 5. Figure 4 shows a method for measuring the outer diameter of a standard material 2 by photographing it with a camera from the side of the upper cover 5 of the test piece 1. In Figure 4, a camera (not shown) is positioned above the housing 4 of the test piece 1 with its shooting direction facing downwards, and photographs the standard material 2 below through the flat part 7 of the upper cover 5. 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 around it, but the camera captures the light reflected upwards, as indicated by the arrow in the figure, and photographs the standard material 2. In this case, the light reflected by the standard material 2 and heading towards the camera passes only through the flat part 7 of the upper cover 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 accurately measured by photographing it using reflected light.

[0039] Figure 5 shows a method for measuring the outer diameter of a standard material 2 by irradiating light upward from below the lower cover 6 of the test piece 1 and photographing the standard material 2 with a camera positioned downward above the flat portion 7 of the upper cover 5. In Figure 5(b), as indicated by the upward arrow, the light irradiated upward from below the test piece 1 is photographed by the camera as transmitted light through the test piece 1. Here, since the standard material 2 is fixed in an inward position away from the side circumference 8 surrounding the flat portion 7, as shown in Figure 5(a), the shadow S1 of the standard material 2 and the shadow S2 of the side circumference 8 are separated by annular light L that passes through the gap between the standard material 2 and the side circumference 8 and travels straight through the flat portion 7, and do not overlap with each other. Therefore, the outer edge or contour of the standard material 2 can be accurately recognized from the image, and the outer diameter of the standard material 2 can be accurately measured.

[0040] Furthermore, according to the test piece 1 of the first embodiment, since the standard substance 2 is fixed to the backing 3, the standard substance 2 can be easily positioned in the center of the side circumference 8 simply by determining the position of the backing 3 and sandwiching it between the upper cover 5 and the lower cover 6, making it easy to handle even small standard substances 2.

[0041] A modified example of the first embodiment, test piece 1a, will be described with reference to Figure 6. As shown in Figure 6(b), this test piece 1a has the same structure as test piece 1 of the first embodiment, except for one difference. The difference is that the standard material 2 is fixed at a position off-center from the center of the flat portion 7 or the side circumference portion 8 of the test piece 1a when viewed from the direction of the photograph, and the standard material 2 is in substantial contact with the inner surface of the side circumference portion 8. Each component is denoted by the same reference numerals as in the drawings of the first embodiment, and the description of the first embodiment will be used accordingly.

[0042] As shown in Figure 6(b), in the modified test piece 1a, light does not pass through to the top of the test piece 1a in the portion where the standard material 2 is in contact with the side circumference 8. Therefore, as shown in Figure 6(a), the shadow S1 of the standard material 2 and the shadow S2 of the side circumference 8 are mostly separated by the annular light L that passes through the gap between the standard material 2 and the side circumference 8 and through the flat portion 7. However, in the portion where the standard material 2 is in contact with the side circumference 8, they are in contact with each other, and in that portion, the outer edge or contour of the standard material 2 becomes slightly unclear.

[0043] Therefore, although the effect of accurately recognizing the outer edge or contour of standard material 2 from the image is slightly weaker compared to the first embodiment, it is still possible to recognize that the shadow S1 of standard material 2 is circular. Thus, by setting an appropriate measurement position relative to the shadow S1, it is possible to measure the outer diameter of the circular shadow S1, unlike the conventional test piece 1 shown in Figure 13 where the shadow S1 of standard material 2 and the shadow S2 of the side circumference 8 overlap all around, and the outer diameter of standard material 2 can be measured more accurately compared to the conventional test piece 1.

[0044] The test piece 21 of the second embodiment will be described with reference to Figure 7. This test piece 21 is a single-piece type, similar to the first embodiment, with one standard substance 2. However, as can be seen from Figure 7, unlike the first embodiment, the test piece 21 of the second embodiment does not have a base 3 on which the standard substance 2 is attached. The standard substance 2 is directly fixed to the upper surface of the lower cover 6 by a fixing means such as an adhesive.

[0045] The procedure for manufacturing the test piece 21 of the second embodiment is as follows. Similar to the first embodiment, an upper cover 5 having a housing portion 4 with a flat portion 7 is manufactured by a molding process. As shown in Figure 7(a), the standard substance 2 is fixed to a predetermined position on the lower cover 6, and the upper cover 5 is placed over the lower cover 6 so that the standard substance 2 is positioned in the center of the flat portion 7 or the side circumference portion 8 when viewed from the direction of the photograph. Then, as shown in Figure 7(b), the outer peripheral edges of the upper cover 5 and the lower cover 6 are clamped and heat-sealed with a heating and crimping device 300 to obtain the test piece 21 of the second embodiment.

[0046] According to the test piece 21 of the second embodiment, since the standard material 2 is directly fixed to the lower cover 6, the backing paper 3 is unnecessary, and the test piece 21 can be constructed with a small number of parts. Furthermore, when measuring the outer diameter of the standard material 2 with transmitted light, since the only components through which light is transmitted are the standard material 2 and the upper and lower covers 5 and 6, the contrast between the shadow of the standard material 2 obtained by photography and the shadow of the side circumference 8 becomes stronger, the outer edge or contour of the standard material 2 becomes clearer, and the outer diameter of the standard material 2 can be measured more accurately.

[0047] The test piece 31 of the third embodiment will be described with reference to Figure 8. Figure 8 is a cross-sectional view of a test piece 31 of the third embodiment. This test piece 31 is a multi-unit type having five standard materials 2. This test piece 31 comprises a base 3, five spherical standard materials 2 mounted in a row on the base 3, an upper cover 5 with five housing sections 4 formed in a row, each having a flat section 7 that covers each standard material 2, and a flat lower cover 6. The five standard materials 2 have different outer diameters and are arranged in order of increasing outer diameter. The five housing sections 4 of the upper cover 5 have inner diameters that correspond to the outer diameters of each standard material 2 and are arranged in order of increasing inner diameter. Then, by sandwiching the base 3 with the standard materials 2 mounted on it between the upper cover 5 and the lower cover 6 so that each standard material 2 is housed in the housing section 4 with the corresponding inner diameter, and by heat-sealing the outer edges of the upper cover 5 and the lower cover 6 to integrate them, a test piece 31 is obtained in which five standard materials 2 with different outer diameters arranged in order of size are covered by a cover.

[0048] The same effects as those obtained with the test piece 31 of the third embodiment can be obtained with the test piece 1 of the single-piece type embodiment described above.

[0049] In the embodiments and modifications described above, the outer shape of standard substance 2 is spherical, but its outer shape is not limited to a sphere. For example, it may be linear, disc-shaped, etc. If it is linear, the type of standard substance 2 can be confirmed by measuring its diameter and length, and if it is disc-shaped, the type of standard substance 2 can be confirmed by measuring its diameter and thickness. Furthermore, the material of standard substance 2 is not particularly limited. In the case of a multi-unit type, the number of standard substances 2 is also not particularly limited. [Explanation of Symbols]

[0050] 1, 1a, 21, 31… Test pieces 2…Standard material 3…The base material is the cardboard backing. 4…Detention Unit 5…Upper cover as the second component 6…Lower cover as the first component 7...Flat area 8...Side circumference 10...Vacuum forming equipment 300... Heat-sealing device

Claims

1. Test pieces (1, 21, 31) for verifying the accuracy of foreign object detection by an X-ray inspection device, A standard material (2) formed into a predetermined shape using a predetermined material, A translucent cover (5, 6) is provided, having a housing (4) that covers the standard material, and a circular flat portion (7) larger than the standard material in plan view on the upper surface of the housing. It is equipped with, The size of the flat portion as viewed from a measurement direction intersecting the flat portion is larger than the outer shape of the standard material as viewed from the measurement direction. The test piece (1, 21, 31) is characterized in that the standard material is fixed at a position spaced apart from the circumferential portion (8) that is continuous with the outer circumference of the flat portion.

2. The test piece (1, 21, 31) according to claim 1, characterized in that the standard material (2) is fixed in the center of the side circumference (8).

3. The test piece (1, 21, 31) according to claim 2, characterized in that the cover (5, 6) is composed of a flat first member (6) and a second member (5) on which the side periphery (8) and the flat portion (7) are formed.

4. The test piece (1, 21, 31) according to claim 3 further comprises a substrate (3) sandwiched between the first member (6) and the second member (5) so as to face the flat portion (7), and the standard material (2) is fixed to the substrate.

5. The test piece (21) according to claim 3, characterized in that the standard material (2) is fixed to the first member (6) so as to face the flat portion (7).

6. The test piece (31) according to claim 3, characterized in that a plurality of housing portions (4) are formed in the second member (5) in order of the size of the inner diameter, and each housing portion houses the standard material (2) having an outer diameter corresponding to the inner diameter.

7. The test piece (1, 21, 31) according to any one of claims 1 to 6, characterized in that the standard substance (2) is spherical.

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