JP2009257835A - Method of producing x-ray air grid - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of producing an X-ray air grid for simply producing the X-ray air grid by simplifying a step to remove a defective metallic foil. <P>SOLUTION: The method of producing an X-ray air grid exchanges entirely a foil body equipped with a first hook 3, a second hook 4 and a metal foil 2 when the defective metal foil is exchanged to a new metallic foil. The foil body engages with a fixture 13 and a traction tool 15 and is pulled toward a longitudinal direction of a strip-shaped metal foil 2; specifically, the fixture 13 and the traction tool 15 engage respectively with the first hook 3 and the second hook 4. It is therefore unnecessary that threading apertures are provided as previously at both ends of the metallic foil and a fixing axis and a pulling axis are inserted through them. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method for manufacturing an X-ray air grid that absorbs scattered X-rays.

  An X-ray imaging apparatus is configured to irradiate a subject with a cone-shaped X-ray beam from an X-ray source and detect transmitted X-rays transmitted through the subject with a flat panel detector (hereinafter abbreviated as FPD). There is what has become. In such an X-ray imaging apparatus, when X-rays pass through the subject, scattered X-rays that are scattered by the subject and then enter the FPD are generated, which deteriorates the contrast of the X-ray fluoroscopic image of the subject. It becomes a factor to make. In order to prevent scattered X-rays from entering the FPD, an X-ray grid is provided so as to cover the X-ray detection surface of the FPD, absorb the scattered X-rays, and directly enter the FPD without being scattered by the subject. X-rays are allowed to pass through.

  One type of X-ray grid is an X-ray air grid in which strip-shaped metal foils that absorb scattered X-rays are arranged. Since this X-ray air grid does not have a spacer, it directly transmits X-rays efficiently. Therefore, an X-ray imaging apparatus provided with this can obtain an X-ray fluoroscopic image suitable for diagnosis.

  Conventionally, as a method of manufacturing this X-ray air grid, for example, there is a configuration described in Patent Document 1. A method of manufacturing an X-ray air grid in which a part of the configuration described in this patent document is diverted and a metal foil is pulled and fixed by a pulling shaft is known. In order to manufacture an X-ray air grid with a conventional configuration, for example, as shown in FIG. 12A, first, for example, 400 metal foils 100 having insertion holes 101a and 101b at both ends are prepared. Then, as shown in FIG. 12B, the insertion hole 101 a on one end side of the metal foil 100 is inserted through the fixed shaft 102, and the insertion hole 101 b on the other end side is inserted through the pulling shaft 103. When the metal foil 100 is inserted through the pulling shaft 103, the opening of the pulling material 104 is inserted through the pulling shaft 103 every time a certain number of metal foils 100 are inserted. Then, after 400 metal foils 100 are inserted through both shafts 102 and 103, the hooks of the springs 105 are inserted through the holes of the tension member 104. The metal foil 100 is shaped by pulling the other end of the spring 105 with a vise and applying tension to the metal foil 100.

  Further, as shown in FIG. 12C, the pulling shaft 103 is covered with an elastic tube 106. According to this configuration, when tension is applied to the metal foil 100, the metal foil 100 bites into the elastic tube 106, so even if the separation distance between the insertion holes 101 a and 101 b varies between the metal foils 100, Tension can be applied to each of the foils 100.

After the metal foil 100 is shaped, a cone-shaped X-ray beam is irradiated to the X-ray air grid for test, and the transmitted X-ray is incident on an X-ray detection means such as a dry plate. By checking the shadow of the X-ray air grid reflected on the dry plate, it is possible to determine the presence or absence of a metal foil (defective metal foil) that obstructs the passage of X-rays directly because the shape is bad. The found defective metal foil is removed and replaced with a new metal foil 100. Specifically, the tension applied to the metal foil 100 is released, the metal foil 100 and the shafts 102 and 103 inserted through the pulling material 104 are pulled out, the defective metal foil is removed, and a new metal foil 100 is removed. Then, the shafts 102 and 103 are again inserted into the metal foil 100 and the tension member 104, and the other end of the spring 105 is pulled with a vise to apply tension to the metal foil 100.
JP 2000-338254 A

  However, the conventional X-ray air grid manufacturing method has the following problems. According to the conventional configuration, when the defective metal foil is replaced with a new metal foil, it is necessary to pull out the pulling shaft 103 once. However, the elastic tube 106 covering the pulling shaft 103 still bites into the metal foil 100 even when the tension applied to the metal foil 100 is released. When the pulling shaft 103 is pulled out in this state, friction is generated between the elastic tube 106 and the metal foil 100. Then, an unexpected stress is applied to the elastic tube 106 and the metal foil 100, and in the worst case, the metal foil 100 may be deformed. The deformed metal foil must be replaced, which increases the manufacturing cost of the X-ray air grid.

  Moreover, inserting and removing the fixed shaft 102 and the pulling shaft 103 is a very complicated operation. That is, according to the conventional method for manufacturing an X-ray air grid, it is necessary not only to insert the 400 metal foils 100 through the shafts 102 and 103 but also to pull them out once and insert them again. Further, when the fixed shaft 102 and the pulling shaft 103 are inserted and removed, the metal foil 100 may be deformed. Therefore, every time the fixed shaft 102 and the pulling shaft 103 are inserted and removed, defective metal foils are successively formed. It may occur.

  The present invention has been made in view of such circumstances, and an object of the present invention is to make it possible to more easily manufacture an X-ray air grid by simplifying the process of removing a defective metal foil. The object is to provide a method for manufacturing an air grid.

In order to achieve such an object, the present invention has the following configuration.
That is, the manufacturing method of the X-ray air grid which manufactures an X-ray air grid by arranging the metal foil which absorbs the strip-shaped X-ray extended in the 1st direction in the manufacturing method of the X-ray air grid which concerns on Claim 1. In the method, a first hook and a second hook are bonded to one end and the other end of the metal foil, respectively, and a foil body manufacturing process for manufacturing a foil body, and fixing extending in a second direction orthogonal to the first direction A tool, a traction tool that faces the fixing tool and extends in the second direction, and a groove that extends in the second direction and is disposed at a position where the fixing tool and the traction tool are interposed, and fits the metal foil of the foil body A foil body in which the first hook is engaged with the fixing tool and the second hook is engaged with the traction tool by inserting the foil body into the foil body insertion base including the comb-shaped plate having the shape from the extending direction of the groove. Inserting process and pulling traction tool to each foil body A pulling process for applying force, an inspection process for irradiating a cone-shaped X-ray beam, and identifying a defective metal foil that obstructs the passage of X-rays directly from the metal foil inserted in the foil body insertion table, Release the tension applied to each, remove the foil body with defective metal foil from the extending direction of the groove by removing it from the extending direction of the groove, and insert a new foil body instead of the extending direction of the groove It comprises a foil body exchanging step and a foil body adhering step in which an adhesive is injected into each of the gaps of the foil body in a state where tension is applied to each of the foil bodies.

  [Operation / Effect] According to the X-ray air grid manufacturing method of the first aspect, it is possible to provide an X-ray air grid manufacturing method capable of replacing a defective metal foil with a new metal foil without deforming the metal foil. According to this configuration, when the defective metal foil is replaced with a new metal foil, the foil body including the first hook, the second hook, and the metal foil is replaced. The foil body is engaged with the fixing tool and the traction tool, and is pulled in the longitudinal direction of the strip-shaped metal foil. Specifically, the fixing tool and the traction tool are the first one. The hook is engaged with each of the second hooks. Therefore, unlike the prior art, there is no need to provide insertion holes at both ends of the metal foil and allow the fixed shaft 102 and the pulling shaft 103 to pass therethrough. Therefore, when the defective metal foil is replaced with a new metal foil, the defective metal foil can be removed only by pulling the foil body in the extending direction of the grooves of the comb plate.

  Moreover, it is not necessary to insert and remove the fixed shaft 102 and the pulling shaft 103 when replacing the defective metal foil with a new metal foil. Therefore, there is no risk that the metal foil is deformed by friction generated between the metal foil and the elastic tube covering the pulling shaft. That is, when a defective metal foil is replaced with a new metal foil, a new defective metal foil is not generated, and the defective metal metal foil can be reliably replaced with a new metal foil. That is, according to the present invention, since the number of times of replacement of the defective metal foil is reduced, it is possible to manufacture an X-ray air grid with simplified manufacturing.

  According to a second aspect of the present invention, in the X-ray air grid manufacturing method according to the first aspect, the traction tool and the engaging portion of the second hook are provided with an elastic body extending in the second direction. It is characterized by that.

  [Operation / Effect] According to the above-described configuration, it is possible to provide an X-ray air grid that is good for allowing X-rays to pass directly by reliably pulling all the metal foils. Strictly speaking, the distance between the first hook and the second hook provided at both ends of the foil body varies depending on the foil body. If an elastic body is provided at the engaging portion between the traction tool and the second hook, the foil body having a short separation distance between the first hook and the second hook has a long separation distance between the first hook and the second hook. Compared to the foil body, it bites into the elastic body more. Therefore, even if the separation distance between the first hook and the second hook provided at both ends of the foil body varies, the tension is concentrated on the foil body where the separation distance between the first hook and the second hook is short. Without disperse | distributing to all the foil bodies. According to the above configuration, since all the foil bodies can be formed in a uniformly pulled state, the metal foil of the manufactured X-ray air grid has a shape that is all linearly extended. An X-ray air grid that reliably passes straight X-rays can be manufactured.

  Further, the thickness of the elastic body can be freely changed. In the conventional configuration, it is impossible to insert an elastic tube having a diameter larger than that of the insertion hole. In addition, since the pulling shaft is provided inside the elastic tube, the elastic tube becomes thinner. However, according to the said structure, an elastic body can be easily changed into a thick thing by changing the shape of a 2nd hook. That is, according to the said structure, the manufacturing method of a more various X-ray air grid can be provided.

  According to a third aspect of the present invention, in the X-ray air grid manufacturing method according to the first or second aspect, the foil body insertion base supports the lower ends of the first hook and the second hook. A support material extending in the second direction is provided, and a foil is disposed by placing a pressing material disposed in the upper ends of the first hook and the second hook and extending in the second direction, and applying stress to the pressing material. The method further includes a pressing material arranging step of pressing the body against the support material.

  [Operation / Effect] According to the above configuration, the X-ray air grid formed by arranging the metal foils can be made flatter. The support material that supports the first hook is in contact with the lower end of the first hook. Further, the support material that supports the second hook is in contact with the lower end of the second hook 4. Thereby, since the arrangement of the first and second hooks becomes more planar, the X-ray air grid becomes flatter.

  Moreover, according to the said structure, the pressing material arrangement | positioning process which presses a foil body from the upper surface of the X-ray air grid formed by arranging metal foil is provided. The pressing material disposed on both hooks presses both hooks against the support material. Thereby, since the arrangement of the first and second hooks becomes more planar, the X-ray air grid becomes flatter.

  According to a fourth aspect of the present invention, in the X-ray air grid manufacturing method according to any one of the first to third aspects, the foil body insertion table includes a traction hook that engages with a traction tool, and a traction device. And a traction hook inclination holding body extending in a second direction for holding the inclination of the hook, and the traction hook inclination holding body includes a traction hook fitting groove for fitting the traction hook.

  [Operation and Effect] According to the above configuration, the metal foil can be supported by the second hook without being twisted. Since the extending direction of the comb plate groove and the extending direction of the pulling hook fitting groove of the pulling hook inclined holder are the same, the metal foil can be supported by the second hook without being twisted. Thereby, not only a useless stress is applied to the metal foil, but also the comb-shaped plate can be prevented from being deformed by the friction of the metal foil.

  The invention according to claim 5 is the X-ray air grid manufacturing method according to any one of claims 1 to 4, wherein the extending direction of the plurality of grooves provided in the comb plate is a comb plate. And gradually extending from the center of the traction hook inclined holding body to the end of the traction hook inclination holding body. It is inclined toward the end portion in the second direction, and at the same position in the second direction, the inclination of the groove and the inclination of the traction hook fitting groove are the same. .

  [Operation and Effect] According to the above configuration, an X-ray air grid suitable for a cone-shaped X-ray beam can be provided. The extending direction of the plurality of grooves provided in the comb plate is gradually inclined from the center portion of the comb plate toward the end portion in the second direction. Thereby, metal foil can be inclined according to the advancing direction of the X-ray irradiated radially from the X-ray focus of the X-ray source. In addition, since the towing hook is also inclined in accordance with the inclination of the metal foil, the inclination of the metal foil and the inclination of the second hook engaged with the towing hook are the same. Therefore, the inclination of the foil body does not change partially. That is, the metal foil can be supported by the second hook without being twisted.

  According to a sixth aspect of the present invention, in the X-ray air grid manufacturing method according to any of the second to fifth aspects, the engaging portion of the second hook that engages with the elastic body is a curved surface. This is a smooth portion.

  [Operation and Effect] According to the above configuration, the elastic body is not damaged by the second hook. Therefore, in the X-ray air grid manufacturing method of the present invention, the life of the elastic body is long.

  According to this invention, the manufacturing method of the X-ray air grid which can replace a defective metal foil with a new metal foil without deforming the metal foil can be provided. According to this configuration, when the defective metal foil is replaced with a new metal foil, the entire foil body is replaced. The fixing tool for fixing the foil body and the traction tool for applying tension to the foil body are engaged with each of the first hook and the second hook of the foil body. Therefore, unlike the prior art, there is no need to provide insertion holes at both ends of the metal foil and to insert the fixed shaft and the tension shaft therethrough. Therefore, when the defective metal foil is replaced with a new metal foil, the defective metal foil can be removed only by pulling the foil body in the extending direction of the grooves of the comb plate.

  Embodiments of an X-ray air grid manufacturing method according to the present invention will be described below with reference to the drawings.

<Configuration of foil body>
FIG. 1 is a plan view illustrating the configuration of the foil body according to the first embodiment. As shown in FIG. 1A, a foil body 1 according to Example 1 is bonded to a strip-shaped metal foil 2 made of a material that easily absorbs X-rays, such as a molybdenum alloy, and one end side of the metal foil 2. A first hook 3 that is fixed and a second hook 4 that is bonded and fixed to the other end of the metal foil 2 are provided. Both the hooks 3 and 4 are bonded so as to extend the metal foil 2 in the longitudinal direction, and the first hook 3 has a first protrusion 3a, a second protrusion 3b, and a connecting portion 3c. The tip of the first protrusion 3 a is bonded to the metal foil 2, and the connecting portion 3 c extends along the longitudinal direction of the metal foil 2. Similarly, the second hook 4 has a first protrusion 4a, a second protrusion 4b, and a connecting portion 4c. The tip of the first protrusion 4 a is bonded to the metal foil 2, and the connecting portion 4 c extends along the longitudinal direction of the metal foil 2. The first protrusion 3a and the second protrusion 3b of the first hook 3 and the first protrusion 4a and the second protrusion 4b of the second hook 4 extend in the same direction in the z direction. , 4 are U-shaped. The first hook 3 and the second hook 4 are made of stainless steel having magnetism.

  Here, the dimension of the foil body 1 is demonstrated. The metal foil 2 has a strip shape with a length in the longitudinal direction and a short direction of, for example, 300 mm and 5.7 mm, respectively, and its thickness is, for example, 30 μm. Both the hooks 3 and 4 have a length in the longitudinal direction and a width direction of, for example, 30 mm and 10 mm, respectively. The thickness is, for example, 0.3 mm to 0.5 mm. And the junction part T (refer FIG. 1) of both the hooks 3 and 4 and the metal foil 2 is carrying out the rectangle of 40 mm in the longitudinal direction of the metal foil 2, and 15 mm in a transversal direction, for example.

  FIG. 1B is a plan view of the foil body 1 as viewed from the foil height direction z of the metal foil 2. As shown in FIG. 1B, both hooks 3 and 4 are bonded and fixed to the same surface of the metal foil 2.

  The manufacturing method of the X-ray air grid which concerns on Example 1 is the foil body manufacturing process which bonds the 1st and 2nd hook to the both ends of strip-shaped metal foil, and manufactures a foil body, and inserts foil body into foil body A foil body insertion step to be inserted into the table, a pulling step for pulling each of the foil bodies, a step of identifying the defective metal foil among the metal foils, a foil body replacement step of replacing the defective metal foil with a new one, The foil body is divided into foil body bonding steps for bonding the foil bodies. Hereinafter, each process will be described in the order of the manufacturing process of the X-ray air grid according to the first embodiment.

<Foil body manufacturing process>
FIG. 2 is a perspective view illustrating the method for manufacturing the foil body according to the first embodiment. In order to manufacture the foil body according to the first embodiment, first, as shown in FIG. 2A, the strip-shaped metal foil 2 is mounted on the metal foil mounting table 5. The metal foil mounting table 5 has a stepped shape. More specifically, a second square column 5b smaller than the first square column 5a is laminated and fixed to the first square column 5a. The first square column 5a has a metal foil placement surface 5c for placing a metal foil, and dowel holes 5d and 5e are provided at both ends in the longitudinal direction of the metal foil placement surface 5c. ing. The distance between the dowel holes 5d and 5e is set sufficiently longer than the length of the metal foil 2 in the longitudinal direction, and the metal foil 2 is placed at a position between the dowel holes 5d and 5e. The second rectangular column 5b is provided with a support surface 5f orthogonal to the metal foil placement surface 5c. When the metal foil 2 is placed on the metal foil placement table 5, the second square pillar 5b is arranged in the longitudinal direction of the metal foil 2. The long side along is in contact with this support surface 5f.

  On the other hand, the 1st hook 3 and the 2nd hook 4 are installed in U character material 6 as shown in Drawing 2 (b). The U-shaped material 6 has a first convex portion 6a, a second convex portion 6b, and a connecting portion 6c that connects them. Dowel portions 6d and 6e extending so as to extend both the convex portions 6a and 6b are provided on the front end surfaces 6f and 6g of the both convex portions 6a and 6b, respectively. In addition, U-shaped hook holding regions 6h and 6k are provided on the front end surfaces 6f and 6g so as to surround the dowel portions 6d and 6e, respectively.

  Next, operations related to the U-shaped material 6 will be described. First, the U-shaped material 6 is placed on a flat work table 7. At this time, the U-shaped material 6 is placed in a direction in which the hook holding regions 6 h and 6 k are adjacent to the work table 7. At this time, the surface of the U-shaped material 6 that is in contact with the work table 7 is defined as a base surface 6m. Then, the first hook 3 is arranged in the hook holding area 6h and the second hook 4 is arranged in the hook holding area 6k in the direction in which the side ends of the first protrusions of the hooks 3, 4 face each other. In addition, since the magnet is provided in the front end surfaces 6f and 6g of the U-shaped material 6, both the hooks 3 and 4 of the magnetic body are not peeled from the U-shaped material 6. At this time, the second protrusion 3b of the first hook 3 is engaged with the dowel 6d on the front end face 6f, and the second protrusion 4b of the second hook 4 is on the dowel 6e on the front end face 6g. Is engaged. Therefore, the distance between the hooks 3 and 4 is determined by the distance between the dowel portions 6d and 6e every time the hooks 3 and 4 are arranged on the U-shaped material 6. Accordingly, every time the foil body 1 is manufactured, the distance between the hooks 3 and 4 is the same. The tip of the first protrusion 3 a and the tip of the second protrusion 3 b of the first hook 3 are in contact with the work table 7. Similarly, the tip of the first protrusion 4 a and the tip of the second protrusion 4 b of the second hook 4 are in contact with the work table 7.

  Next, as shown in FIG. 2 (c), an elongated weight 8 is arranged so as to cover the metal foil 2 placed on the metal foil placing table 5. This is an operation for removing the warp of the metal foil 2 by pressing the metal foil 2. Then, the metal foil mounting table 5 and the U-shaped material 6 are combined to form the foil body 1. At this time, the distal end surfaces 6f and 6g of the U-shaped material 6 are brought close to the metal foil placing surface 5c while the base surface 6m of the U-shaped material 6 is pressed against the support surface 5f of the second quadrangular column 5b. Accordingly, when paying attention to the first hook 3, the tip of the first protrusion 3a and the tip of the second protrusion 3b are in contact with the support surface 5f. If the U-shaped material 6 is slid as it is, the dowel portion 6 d of the U-shaped material 6 fits into the dowel hole 5 d of the metal foil placing table 5. Similarly, the dowel portion 6e is fitted into the dowel hole 5e. And if the U-shaped material 6 is made to slide as it is, the 1st protrusion 3a of the 1st hook 3 will be pressed by the end in the longitudinal direction of the metal foil 2. FIG. Incidentally, an adhesive tape is provided at a position where the first protrusion 3a and the metal foil 2 are interposed. Therefore, the first hook 3 and the metal foil 2 are bonded and fixed via the adhesive tape. Similarly, the first protrusion 4 a of the second hook 4 is pressed against the other end in the longitudinal direction of the metal foil 2. Also here, an adhesive tape is provided at a position where the first protrusion 4a and the metal foil 2 are interposed. Therefore, the second hook 4 and the metal foil 2 are bonded and fixed via the adhesive tape. Finally, if the U-shaped material 6 and the weight 8 are removed from the metal foil mounting table 5, the foil body 1 in which both the hooks 3 and 4 and the metal foil 2 are bonded with an adhesive tape is obtained.

  In the above process, the long side along the longitudinal direction of the metal foil 2 is in contact with the support surface 5f. Further, the metal foil 2 is pressed while the tips of the protrusions of the hooks 3 and 4 are in contact with the support surface 5f. Therefore, when the metal foil 2 and the hooks 3 and 4 are bonded to each other, the long sides along the longitudinal direction of the metal foil 2 and the protrusions of the hooks 3 and 4 are securely bonded without being shifted and bonded. The foil body 1 with the matched tip can be manufactured.

<Foil body insertion process>
Next, the foil body 1 is inserted into the foil body insertion base 10. FIG. 3 is a partially broken cross-sectional view illustrating the configuration of the foil body insertion base according to the first embodiment. As shown in FIG. 3, the foil body insertion base 10 includes a pair of comb-shaped plates 11 and 12 extending in the y direction. The comb-shaped plates 11 and 12 have, for example, 400 grooves 11a and 12a extending in a substantially z direction into which the metal foil 2 can be inserted. In the foil body insertion step, the metal foil 2 is inserted into the grooves 11a and 12a from the z direction, and the portions of the metal foil 2 near the hooks 3 and 4 are contacted and supported by the grooves 11a and 12a. . In addition, let the longitudinal direction of the metal foil 2 be an x direction. Therefore, the x direction corresponds to the first direction of the present invention. In the foil body insertion step, the pair of comb-shaped plates 11 and 12 are fixed to the foil body insertion base 10, but these are detachable from the foil body insertion base 10. The process of detaching the pair of comb-shaped plates 11 and 12 from the foil body insertion base 10 will be described later. The y direction and the z direction correspond to the second direction and the extending direction of the groove in the present invention.

  As shown in FIG. 3, the metal foil 2 is inserted into the grooves 11 a and 12 a of the comb-shaped plates 11 and 12 from the z direction, and at the same time, the connecting portion 3 c of the first hook 3 has an L-shaped cross section. It is engaged with a fixture 13 made of a prism. The fixing tool 13 is supported by the base 14 of the foil body insertion base 10 and does not change the position with respect to the base 14 even if a tension is applied to the metal foil 2. On the other hand, the connecting portion 4 c of the second hook 4 is engaged with the elongated traction tool 15. The traction tool 15 includes a base shaft 15a made of metal or the like, and an elastic body 15b made of an elongated rubber or the like extending in the y direction is bonded to a position where the base shaft 15a and the second hook 4 are interposed. ing. Accordingly, the elastic body 15b is positioned at the engaging portion between the traction tool 15 and the second hook 4. The thickness of the elastic body 15b in the x direction is desirably about 10 times the variation in the separation distance between the hooks 3 and 4 in the foil body 1. More specifically, the average compressive strain in the x direction of the elastic body 15b is at least five times the variation in the separation distance between the first hook 3 and the second hook 4 in the x direction of the foil body 1. Is desirable. Specifically, if the variation in the separation distance between the first hook 3 and the second hook 4 is 0.2 mm, the average compression strain of the elastic body 15b is desirably 1 mm. That is, the thickness and material of the elastic body 15b in the x direction are set so as to sufficiently absorb the variation in the separation distance between the first hook 3 and the second hook 4. For example, the natural thickness of the elastic body 15b is 6 mm. It has become. The traction tool 15 is supported by a traction hook 16, details of which will be described later.

  FIG. 4 is a perspective view illustrating the foil body insertion step according to the first embodiment. As shown in FIG. 4, the foil body 1 is inserted into all the grooves 11 a of the comb plate 11, and the foil body insertion step of inserting the foil body 1 into the foil body insertion base 10 is completed. At this time, for example, about 400 foil bodies 1 are inserted into the foil body insertion base 10, and the foil bodies 1 are arranged at intervals of 0.6 mm in the y direction. Thereafter, the X-ray air grid manufacturing method according to the first embodiment includes a pressing material arranging step of arranging a supporting material, which will be described later.

<Pulling process>
Next, all of the foil body 1 is pulled together and shaped into a shape suitable for passing X-rays directly. At this point, the second protrusion 3b of the first hook 3 and the fixture 13 are engaged from the x direction, and the second protrusion 4b of the second hook 4 and the traction tool 15 are in the x direction. Will be engaged. Since the second hook 4 is in contact with the elastic body 15b of the traction tool 15, the second hook 4 bites into the elastic body 15b as tension is applied to the foil body 1. Thereby, both the hooks 3 and 4 are engaged with the fixing tool 13 and the traction tool 15 from the x direction, respectively.

  Next, a new member related to the pulling process according to the first embodiment will be described. FIG. 5 is a perspective view illustrating a pulling process according to the first embodiment. As shown in FIG. 5, the elongated traction tool 15 is supported by a P-shaped traction hook 16. A quadrangular through hole 17 is provided at the base end portion of the traction hook 16, and the traction tool 15 is inserted therethrough. The pulling hook 16 extends in the x direction so as to extend the foil body 1, and its tip is connected to the tension spring 18. Specifically, a spring engagement hole 19 for hooking the crane of the tension spring 18 is provided in the vicinity of the tip of the traction hook 16, and one end of the J-shape of the tension spring 18 is inserted. The foil body insertion base 10 is provided with an elongated traction hook inclined holding body 20 extending in the y direction between the through hole 17 and the spring engagement hole 19. The pulling hook inclined holding body 20 is provided with a holding groove 21 extending substantially in the z direction, and the pulling hook 16 is fitted into the holding groove 21. By changing the extending direction of the holding groove 21, the tow hook 16 can be inclined. The tow hooks 16 are arranged at substantially equal intervals in the y direction, and 20 tow hook hook holding bodies 20 are provided, for example.

  Next, the operation will be described. The other end of the tension spring 18 is connected to a vise (not shown), and a tension is applied to the traction hook 16 via the tension spring 18 by operating a handle provided in the vise. Then, the elongated traction tool 15 is pulled in the direction (x direction) in which the foil body 1 is extended. Since the second hook 4 of the traction tool 15 and the foil body 1 is engaged, when the tension is applied to the traction tool 15, the tension is applied to the foil body 1 in accordance with the longitudinal direction of the metal foil 2. Is given in the direction of stretching. In this way, tension is applied to the metal foil 2 that has been bent in the foil body insertion step, and the metal foil 2 becomes linear.

<Inspection process>
Next, in the state where all of the foil body 1 is pulled uniformly, a cone-shaped X-ray beam is irradiated from the z direction, and the presence or absence of a defective metal foil that directly obstructs the passage of X-rays is inspected. An X-ray detector such as an FPD is disposed on the top of the foil body insertion base 10 in the z direction, and a cone-shaped collimated X-ray beam is irradiated from the back direction of the foil body insertion base 10 toward the FPD. Incidentally, the defective metal foil appears as a black line in an X-ray photograph contrasted with FPD.

  There is a desirable setting for the position of the X-ray source that irradiates the X-ray beam. FIG. 6 is a plan view for explaining the inclination of the groove according to the first embodiment. As shown in FIG. 6A, the comb-shaped plate 11 has a plurality of grooves 11a extending substantially in the z-direction. The grooves 11a are directed from the center of the comb-shaped plate 11 to the end in the longitudinal direction. It is gradually inclined according to. In addition, each of the grooves 11 a at the end of the comb plate 11 is inclined so that its opening is away from the center of the comb plate 11. And if this groove | channel 11a is extended temporarily, all will concentrate on one point. This point is referred to as a concentrated point for convenience.

  Similarly, a concentration point exists for the comb-shaped plate 12. For convenience, the straight line connecting the concentrated points of the two comb-shaped plates 11 and 12 will be referred to as a concentrated line when viewed from the entire foil body insertion base 10. And as shown in FIG.6 (b), the holding groove 21 which the traction hook inclination holding body 20 holding the traction tool 15 has similarly goes from the center part of the traction hook inclination holding body 20 to the edge part in a longitudinal direction. It is gradually inclined according to. And if this holding groove 21 is extended temporarily, all will concentrate on one point. And this concentration point exists on the concentration line.

  When irradiating a cone-shaped X-ray beam, the X-ray generation focal point in the X-ray source is made to coincide with this concentrated line. Specifically, the X-ray generation focal point is made to coincide with any point included in the concentrated line. When viewed from the x direction, the metal foil 2 is inserted into the grooves 11a and 12a of the pair of comb-shaped plates 11 and 12, so that the metal foil 2 has an inclination angle of the grooves 11a and 12a. It's just leaning. Incidentally, in the comb-shaped plates 11 and 12, the inclination angles of the grooves 11a and 12a into which the same metal foil 2 is inserted are the same. Since the X-ray generation focal point and the concentrated line in the X-ray source coincide with each other, the cone-shaped X-ray beam passes along the metal foil 2 without being obstructed by the metal foil 2 and enters the FPD. It will be incident. The holding groove corresponds to the pulling hook fitting groove of the present invention.

  In addition, at the same position in the y direction, the inclination of the grooves 11a and 12a of the comb-shaped plates 11 and 12 and the inclination of the holding groove 21 of the tow hook inclination holding body 20 are the same. Thereby, although the tow hook 16 inclines the 2nd hook 4 which comprises the foil body 1, the inclination angle becomes substantially the same as that of the metal foil 2. FIG. Therefore, the inclination of the foil body 1 does not change partially. That is, the metal foil 2 can be supported by the second hook 4 without being twisted. Thereby, not only a useless stress is applied to the metal foil 2 but also the comb plate 12 can be prevented from being deformed by the friction of the metal foil 2.

  By the way, when the cross section of the metal foil 2 is L-shaped for an unexpected reason, the metal foil 2 obstructs the passage of X-rays. Such a metal foil 2 is determined to be a defective metal foil that causes the performance of the X-ray air grid to deteriorate.

<Foil body replacement process>
Subsequently, an operation of removing the defective metal foil from the foil body insertion base 10 and replacing it with a new foil body 1 is performed. First, the handle of a vise is operated and the tension | tensile_strength provided to each of the foil bodies 1 is cancelled | released. By doing so, each of the foil bodies 1 can be inserted and removed in the z direction. The foil body 1 having a defective metal foil is removed from the foil body insertion base 10 by lifting both hooks 3 and 4 in the z direction. Instead, a new foil body 1 is replaced with a pair of comb-shaped plates 11, By inserting the metal foil 12 into the z direction, the defective metal foil is replaced. In addition, after this foil body replacement | exchange process, it returns to the above-mentioned tension | pulling process again, and a foil body replacement | exchange process is repeated until there is no defective metal foil.

<Foil body bonding process>
FIG. 7 is a plan view for explaining the foil body bonding step according to the first embodiment. When the foil body replacement process is finished and there is no defective metal foil, the metal of the foil body group inserted into the foil body insertion base 10 with the tension applied to each of the foil bodies 1. A pair of seat covers 36 and 37 are mounted from the z direction so as to sandwich the foil 2. Adhesives are respectively applied to the surfaces of the pair of sheet covers 36 and 37 facing the metal foil 2. Therefore, all the metal foils 2 are bonded and integrated with the sheet covers 36 and 37. The pair of seat covers 36 and 37 are preferably easy to transmit X-rays. For example, the sheet covers 36 and 37 are made of CFRP (Carbon fiber reinforced plastic) having a vertical length of 240 mm, a width of 240 mm, and a thickness of 0.15 mm. be able to.

<Subsequent process>
After the adhesive is sufficiently cured, the tension applied to each of the foil bodies 1 is released, and the region sandwiched between the comb plate 11 and the first hook 3 in the foil body 1 as shown in FIG. Are cut at two positions, namely M1, which is a region sandwiched between the comb plate 12 and the second hook 4, and the hooks 3 and 4 and the metal foil 2 are cut. Then, the hooks 3 and 4 are removed, and the fixation between the comb-shaped plates 11 and 12 and the foil body insertion base 10 is released. Then, the movable comb-shaped plate is moved in the x direction in a direction away from the center of the metal foil 2 to be detached from the foil body insertion base 10 and pulled out from the metal foil 2. In this way, an array of metal foils 2 constituting the X-ray air grid according to the first embodiment is formed. Then, the array body is fitted into the square grid frame, the seat covers 36 and 37 and the grid frame are fixed, and the X-ray air grid according to the first embodiment is completed. The dimension of the completed X-ray air grid is, for example, 240 mm both vertically and horizontally.

  In addition, in order to manufacture a higher-performance X-ray air grid, the foil body insertion base 10 according to the first embodiment includes a plurality of members that are not mentioned in the description of each process described above. Hereinafter, the peripheral members will be described in order.

<About peripheral members>
FIG. 8 is a perspective view for explaining peripheral members of the foil body insertion base according to the first embodiment. As shown in FIG. 8, L-shaped first hook holding members 30a and 30b for holding the second protrusion 3b of the first hook 3 are provided. The first hook holding members 30 a and 30 b are fixed to the foil body insertion base 10 via a holding member fixing member 31. A plurality of the holding material fixing members 31 are provided on the foil body insertion base 10, and first hook holding materials 30a and 30b are provided on two side surfaces along the xz plane, respectively. Further, when viewed from the entire foil body insertion base 10, the holding material fixing members 31 are arranged in an array in the y direction, and the array is provided on the back side of the fixture 13 when viewed from the center of the metal foil 2.

  FIG. 6C is a plan view of the holding member fixing members arranged in an array according to the first embodiment when viewed from the yz plane. The holding member fixing member 31 has a rectangular shape at the center of the array, but has a trapezoidal shape at the end of the array. As shown in FIG. 6A, the groove 11a of the comb plate 11 is gradually inclined from the center portion of the comb plate 11 toward the end portion in the longitudinal direction. Correspondingly, the inclination is gradually inclined from the center of the array in which the holding member fixing members 31 are arranged toward the end of the array in the y direction. Therefore, the two side surfaces extending in the x direction of the holding member fixing member 31 that supports the same also gradually incline toward the end of the array in the y direction. More specifically, the inclination of the grooves 11a and 12a of the comb-shaped plates 11 and 12 and the inclination of the first hook holding member 30 are the same at the same position in the y direction.

  Thereby, the inclination of the metal foil 2 and the inclination of the 1st hook 3 can be made substantially the same. Therefore, even if the metal foil 2 is tilted by the comb plate 11, the metal foil 2 can be supported by the first hook 3 without being twisted. Thereby, not only a useless stress is applied to the metal foil 2 but also the comb plate 11 can be prevented from being deformed by the friction of the metal foil 2.

  FIG. 9 is a plan view illustrating the support material according to the first embodiment. Although not explained in each of the above steps, in order to make the X-ray air grid formed by arranging the metal foils 2 flatter, the foil body insertion base 10 is shown in FIG. In this manner, a prismatic first hook support material 32 and a prismatic second hook support material 33 are provided. The first hook lower support member 32 is in contact with the tip of the first protrusion 3 a of the first hook 3. The second hook lower support member 33 is in contact with the tip of the first protrusion 4 a of the second hook 4. These make the X-ray air grid flatter. The first hook lower support member 32 and the second hook lower support member 33 have the same height in the z direction.

  Moreover, although this was not demonstrated in each above-mentioned process, as shown in FIG. 9, the foil body insertion stand 10 which concerns on Example 1 is an X-ray air grid formed by the metal foil 2 arranging. In order to make it flatter, a prismatic first hook pressing member 34 that presses the first hook 3 against the first hook lower support member 32, and a prismatic second member that presses the second hook 4 against the second hook lower support member 33. 2 hook pressing member 35. The first hook pressing member 34 is in contact with the connecting portion 3 c of the first hook 3. Further, the second hook pressing member 35 is in contact with the connecting portion 4 c of the second hook 4. In addition, both the pressing materials 34 and 35 are comprised with the elastic member with resilience, for example, are sponge-like. Since it is such a structure, both the pressing materials 34 and 35 are reliably pressed to both the lower support materials 32 and 33, without fixing both the hooks 3 and 4. FIG. Therefore, even in the state where the two pressing members 34 and 35 are disposed, the metal foil 2 is slidable in the x direction. If the traction tool 15 is pulled by the traction hook 16 in this state, the foil body 1 is surely provided. A tension is applied to the. In the first hook 3, the first hook lower support member 32 and the first hook pressing member 34 are substantially in the same position in the x direction. Similarly, in the second hook 4, the second hook lower support member 33 and the second hook pressing member 35 are substantially in the same position in the x direction. Since it is such a structure, when pressing the foil body 1 with the both pressing materials 34 and 35, the 1st hook 3 and the 2nd hook 4 do not incline in the z direction, without the 1st hook 3 and the 2nd hook 4 tilting. The hook 4 is reliably pressed against each of the first hook lower support member 32 and the second hook lower support member 33. Both pressing materials 34 and 35 correspond to the pressing material of the present invention.

  Before the above-described pulling step, each of the first hook pressing member 34 and the second hook pressing member 35 is disposed so that the y direction is the longitudinal direction so as to cover the first hook 3 and the second hook 4. . Then, stress is applied to both pressing members 34, 35, and both hooks 3, 4 are pressed against both lower support members 32, 33. In the present invention, this is called a pressing material arranging step. In Example 1, this step may be omitted once, and the tension applied to each of the foil bodies 1 may be released when there is no defective metal foil.

  Although not described in the above-described pulling step, as shown in FIG. 9, the fixture 13 includes a V-shaped bulging portion 13a protruding in the y direction, and the tip of the bulging portion 13a is the first. The edge portion 13 b is engaged with the hook 3. On the other hand, the traction tool 15 has a second hook engaging portion 15 c that engages with the second hook 4. In addition, the position in the z direction of the edge part 13b and the 2nd hook engaging part 15c is substantially the same as the centerline C in the z direction of the metal foil 2. Therefore, no torsional stress in the z direction is applied to the metal foil 2 in the pulling process.

<About towing tools>
Finally, the configuration of the traction tool 15 will be described. The traction tool 15 includes a base shaft 15a made of metal or the like, and an elastic body 15b made of elongated rubber or the like at a position where the base shaft 15a and the second hook 4 are interposed. FIG. 10 is a cross-sectional view illustrating the configuration of the traction tool according to the first embodiment. FIG. 10 is a cross-sectional view of the traction tool 15 cut along the xy plane so as to include the arrow D shown in FIG. When tension is not applied to the traction tool 15, the second hook 4 and the traction hook 16 are separated from the traction tool 15 as shown in FIG. A recess 40 is provided in a region surrounded by the traction hook 16 in the elastic body 15 b constituting the traction tool 15. The recess 40 is provided so as to open toward the base shaft 15a. Here, as shown in FIG. 10B, when tension is applied to the traction hook 16, the traction hook 16 and the base shaft 15a are engaged. Then, the second hook 4 and the elastic body 15b are engaged, and the second protrusion 4b of the second hook 4 bites into the elastic body 15b. At that time, the elastic body 15 b tends to extend in the extending direction (y direction) of the traction tool 15. Since the tow hook 16 does not engage with the elastic body 15b, a region R in which no tension is applied to the elastic body 15b is generated by the thickness of the tow hook 16. Then, in the region R, an attempt is made to deform so as to rise toward the tow hook 16. Such deformation also occurs in the vicinity of the pulling hook 16 in the elastic body 15b. Therefore, when comparing the positions in the pulling direction, the second hook 4 adjacent to the pulling hook 16 and the second hook separated from the pulling hook 16 are used. 4 will be shifted. However, since the recess 40 is provided in the region surrounded by the traction hook 16 in the elastic body 15b according to the first embodiment, the elastic body 15b faces the recess 40 as indicated by an arrow in the figure. It gets excited. Therefore, since the elastic body 15b does not deform so as to rise toward the traction hook 16, the second hook 4 adjacent to the traction hook 16 and the second hook not adjacent to the traction hook 16 are compared when the positions in the pulling direction are compared. 4 can be surely the same.

  FIG. 11 is a cross-sectional view illustrating the configuration of the second hook according to the first embodiment. As shown to Fig.11 (a), the engaging part of the 2nd protrusion 4b engaged with the elastic body 15b is a curved-surface smooth part. Therefore, the stress is not applied to the elastic body 15b as much as possible, and the elastic body 15b is not damaged more. As shown in FIG. 11B, if the engaging portion of the second protrusion 4b that engages with the elastic body 15b is flat as shown in FIG. 11B, they are separated from the adjacent second hook 4 by the elastic body 15b. Such stress in the x direction is applied. Moreover, since the engaging part of the 2nd protrusion 4b becomes a structure which has an angle | corner, it will also damage the elastic body 15b. However, as shown in FIG. 11C, when the engaging portion of the second protrusion 4b that engages with the elastic body 15b is sharp, the stress that separates the second hook can be suppressed, but the second protrusion Since the engaging portion 4b is sharp, the elastic body 15b is more severely damaged. However, according to the configuration of the first embodiment, the engaging portion of the second protrusion 4b that engages with the elastic body 15b is a curved smooth portion as shown in FIG. The body 15b is not damaged as much as possible. Moreover, according to the said structure, the clearance gap 41 into which the elastic body 15b enters is also provided between the adjacent 2nd hooks 4. FIG. Accordingly, as shown in FIG. 11 (e), even if the elastic body 15b is distorted by pulling the foil body 1, the elastic body 15b rises so as to extend toward the gap 41. No stress in the x direction is applied to the second hook 4.

  As described above, according to the configuration of the first embodiment, an X-ray air grid manufacturing method that can replace a defective metal foil with a new metal foil 2 without deforming the metal foil 2 can be provided. According to the above configuration, when the defective metal foil is replaced with a new metal foil 2, the foil body 1 is replaced. A fixing tool 13 that fixes the foil body 1 and a traction tool 15 that applies tension to the foil body 1 are engaged with each of the first hook 3 and the second hook 4 of the foil body 1. Therefore, unlike the prior art, there is no need to provide insertion holes at both ends of the metal foil and to insert the fixed shaft and the tension shaft therethrough. Therefore, when the defective metal foil is replaced with a new metal foil 2, the defective metal foil can be removed simply by pulling out the foil body 1 in the extending direction of the groove 11a of the comb plate 11. Further, the elastic body can be made thicker than the conventional method. If the length of the connecting portion 4c of the second hook 4 is changed, the shape of the cross section of the traction tool 15 engaged with the second hook 4 can be freely changed. Therefore, the applied tension is not concentrated on the foil body in which the distance between the first hook and the second hook is short, but is distributed to all the foil bodies, so that when all the foil bodies 1 are pulled, Can do. Therefore, all the metal foils 2 of the X-ray air grid to be manufactured have a shape that is extended linearly, and an X-ray air grid that allows straight X-rays to pass through can be manufactured. Moreover, since the insertion hole of the metal foil 2 is not broken by the tension, the tension can be further increased.

  And according to the structure of Example 1, the surface where the metal foil 2 of the X-ray air grid was arranged can be made more flat. The position of the metal foil 2 in the z direction in the configuration of the first embodiment is determined by the engagement portion between the first hook 3 and the first hook support member 32, the second hook 4 and the second hook support material. 33 is an engaging portion. Since the positions in the z direction of both the hooks 3 and 4 and the metal foil 2 are constant, the position in the z direction of the metal foil 2 in the foil body insertion base 10 is constant in each of the metal foils 2. .

  The present invention is not limited to the embodiment described above, and can be modified as follows.

  (1) In the embodiment described above, the tension is applied to the foil body 1 via the tension spring 18, but the present invention is not limited to this, and a piston or the like may be used.

  (2) In the embodiment described above, the metal foil 2 is a molybdenum alloy, but may be a lead alloy or a heavy metal such as Ta. Thus, the metal foil according to the present invention can be replaced with a metal that does not transmit X-rays. Moreover, you may use the foil which fixed the heavy metal powder on both surfaces of the elastic sheet.

  (3) By providing a suction hole along the longitudinal direction of the metal foil on the metal foil mounting surface 5c of the metal foil mounting table 5 in the above-described embodiment and sucking the metal foil 2, the metal foil 2 is mounted on the metal foil. It is good also as a structure closely_contact | adhered to the mounting surface 5c. According to this modification, the metal foil 2 can be made flatter. By making the metal foil 2 flat, it is possible to manufacture the foil body 1 in which the distances between the hooks 3 and 4 are uniform.

  (4) The foil body 1 in the above-described embodiment has a configuration in which the hooks 3 and 4 and the metal foil 2 are bonded and fixed with an adhesive tape. And the metal foil 2 may be bonded and fixed with a liquid adhesive having a predetermined curing rate.

It is a top view explaining the structure of the foil body which concerns on Example 1. FIG. It is a perspective view explaining the manufacturing method of the foil body which concerns on Example 1. FIG. It is a partially broken sectional view explaining the structure of the foil body insertion stand which concerns on Example 1. FIG. It is a perspective view explaining the foil body insertion process which concerns on Example 1. FIG. 6 is a perspective view for explaining a pulling process according to Embodiment 1. FIG. 6 is a plan view for explaining the inclination of the groove according to Embodiment 1. FIG. It is a top view explaining the foil body adhesion | attachment process which concerns on Example 1. FIG. It is a perspective view explaining the peripheral member of the foil body insertion stand which concerns on Example 1. FIG. It is a top view explaining the support material which concerns on Example 1. FIG. It is sectional drawing explaining the structure of the traction tool which concerns on Example 1. FIG. It is sectional drawing explaining the structure of the 2nd hook which concerns on Example 1. FIG. It is a figure explaining the manufacturing method of the conventional X-ray air grid.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Foil body 2 Metal foil 3 1st hook 4 2nd hook 10 Foil body insertion bases 11 and 12 Comb-shaped plates 11a and 12a Groove 13 Fixing tool 15 Towing tool 15b Elastic body 16 Towing hook 20 Towing hook inclination holding body 20a Towing hook Mating groove

Claims (6)

In the method of manufacturing an X-ray air grid, an X-ray air grid is manufactured by arranging metal foil that absorbs strip-shaped X-rays extending in the first direction.
A foil body manufacturing step of manufacturing a foil body by bonding a first hook and a second hook to one end and the other end of the metal foil; and
A fixture extending in a second direction orthogonal to the first direction, a traction tool arranged facing the fixture and extending in a second direction, and extending in the second direction and the fixture and the traction tool; The foil body is inserted from the extending direction of the groove into a foil body insertion base provided with a comb-shaped plate having a groove to which the metal foil of the foil body is fitted. A foil body inserting step of engaging a hook with the fixture and engaging the second hook with the traction tool;
Pulling the traction tool and applying tension to each of the foil bodies,
An inspection step of irradiating a cone-shaped X-ray beam and identifying a defective metal foil that obstructs the passage of X-rays directly from the metal foil inserted into the foil body insertion table;
The tension applied to each of the foil bodies is released, and the foil body provided with the defective metal foil is removed from the foil body mounting table by pulling out from the extending direction of the groove, and a new foil body instead of the foil body is removed. Foil body replacement process to insert from the stretching direction,
A method of manufacturing an X-ray air grid, comprising: a foil body bonding step of injecting an adhesive into each of the gaps of the foil body in a state where tension is applied to each of the foil bodies.   2. The X-ray air grid manufacturing method according to claim 1, wherein the traction tool and the engaging portion of the second hook are provided with an elastic body extending in the second direction. 3. Air grid manufacturing method. In the manufacturing method of the X-ray air grid of Claim 1 or Claim 2,
The foil body insertion base is provided with a support material extending in the second direction for supporting lower ends of the first hook and the second hook,
A pressing material arrangement step of arranging a pressing material arranged at the upper ends of the first hook and the second hook and extending in the second direction, and applying the stress to the pressing material to the lower support material. A method for producing an X-ray air grid, further comprising:   4. The X-ray air grid manufacturing method according to claim 1, wherein the foil body insertion base is a traction hook that engages with a traction tool, and a second direction that maintains an inclination of the traction hook. 5. And a tow hook inclination holding body that further includes a tow hook fitting groove for fitting the tow hook.   5. The method of manufacturing an X-ray air grid according to claim 1, wherein an extending direction of the plurality of grooves provided in the comb plate is an end portion in a second direction from a center portion of the comb plate. And the extending direction of the plurality of traction hook fitting grooves provided in the traction hook inclination holding body is directed from the center of the traction hook inclination holding body toward the end in the second direction. Therefore, the X-ray air grid manufacturing method is characterized in that the groove and the tow hook fitting groove are inclined at the same position in the second direction.   6. The method of manufacturing an X-ray air grid according to claim 2, wherein the engaging portion of the second hook that engages with the elastic body is a curved smooth portion. A method for manufacturing an X-ray air grid.

Images