Scanning coil, scanning magnet and method for manufacturing scanning coil

Abstract

The present invention relates to a scanning coil (100) comprising a winding frame (110), an electric wire (120), and a resin (130) for fixing the electric wire (120). The winding frame (110) comprises a main body (111) formed of an electric insulating material and having a cylindrical shape of a truncated cone in an integrated or assembled state, a routing path (113) formed in the main body (111) and having the electric wire (120) mounted thereon, and a plurality of retaining portions (112) formed on the inner peripheral surface side of the main body (111) at intervals from each other in the axial direction along the routing path (113).

Description

Technical Field

[0001] Embodiments of the present invention relate to a scanning coil, a scanning magnet using the scanning coil, and a method for manufacturing the scanning coil. Background Art

[0002] In a heavy particle radiation therapy facility, a beam accelerated to a high energy level is applied to the affected area to kill cancer tissue. For example, in order to perform irradiation while narrowing the carbon beam, a high degree of control is required. Therefore, scanning magnets are arranged in the horizontal and vertical directions relative to the beam line. In order to form a high magnetic field by the scanning coil constituting the scanning magnet, a large current needs to be energized to the scanning coil. In addition, in order to highly control the beam, the conductor in the coil needs to be arranged according to the design with high precision.

[0003] Under such circumstances, a method has been proposed in which an adhesive such as a phenoxy resin is applied to the surface of a winding frame in advance, a superelectric wire is arranged while being welded, and then the outer periphery of the superelectric wire is fixed by an epoxy resin containing a filler. By utilizing the superconducting state in this way, a coil that can realize a high magnetic field in a compact manner can be provided.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2006-135060 Summary of the invention

[0007] Problems that the invention will solve

[0008] The above-described method of manufacturing the scanning coil has the following problems.

[0009] In a scanning magnet, a large current needs to be passed through an electric wire to form a magnetic field. By utilizing the superconducting state as in the above example, a high magnetic field can be obtained with a compact coil. However, in order to excite the scanning coil into a superconducting state, expensive superconducting wires and special refrigerators are required. On the other hand, in the case of a scanning coil based on a conventional electric wire, the rigidity increases due to the thickening of the wire diameter, and there is a problem of difficulty in arranging the wire with high precision in the previous manufacturing method.

[0010] Therefore, an object of an embodiment of the present invention is to enable high-precision arrangement of the electrical conductors of the scanning coil.

[0011] Means for solving problems

[0012] In order to achieve the above-mentioned purpose, the present embodiment relates to a scanning coil, characterized in that it comprises: a winding frame having a main body portion formed of an electrically insulating material and having a cylindrical shape with a truncated cone shape in an integrated or assembled state, a layout path formed in the main body portion, and a plurality of retaining portions formed on the inner circumferential surface side of the main body portion at intervals from each other in the axial direction along the layout path; an electric conductor installed on the plurality of layout paths; and a resin for fixing the electric conductor.

[0013] In addition, the present embodiment relates to a method for manufacturing a scanning coil, characterized in that it comprises: a winding frame manufacturing step of manufacturing a winding frame having a routing path for installing an electric conductor; an electric conductor installation step of installing the electric conductor on the routing path; a resin injection step of forming an assembly for resin injection and injecting resin into the routing path and solidifying it; and a demolding step of demolding the scanning coil, wherein the winding frame has a main body portion formed of an electrically insulating material and having a cylindrical shape of a truncated cone in an integrated or assembled state, a plurality of routing paths formed on the main body portion, and a plurality of retaining portions formed on the inner circumferential surface side of the main body portion at intervals from each other in the axial direction along the routing path. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a longitudinal sectional view showing the scanning magnet according to the first embodiment.

[0015] Figure 2 1 is a flowchart showing the steps of the method for manufacturing the scanning coil according to the first embodiment.

[0016] Figure 3 This is a flowchart showing the detailed steps of manufacturing a winding frame in the method for manufacturing a scanning coil according to the first embodiment.

[0017] Figure 4 The structure of the winding frame component produced in the method for producing the scanning coil according to the first embodiment is shown. Figure 5 Cross-sectional view along line IV-IV.

[0018] Figure 5 The structure of the winding frame component produced in the method for producing the scanning coil according to the first embodiment is shown. Figure 4 Sectional view along line VV.

[0019] Figure 6 The structure of the winding frame produced in the method for producing the scanning coil according to the first embodiment is shown. Figure 8 Cross-sectional view along line VI-VI.

[0020] Figure 7 The structure of the winding frame produced in the method for producing the scanning coil according to the first embodiment is shown. Figure 8Cross-sectional view along line VII-VII.

[0021] Figure 8 The structure of the winding frame produced in the method for producing the scanning coil according to the first embodiment is shown. Figure 6 Cross-sectional view taken along line VIII-VIII.

[0022] Fig. 9 This is a perspective view showing the vicinity of the end portion on the large diameter side of the winding frame produced in the method for producing the scanning coil according to the first embodiment.

[0023] Fig.10 This is a first partial cross-sectional view showing a state where the electric conducting wire 120 is attached to the winding frame in the method for manufacturing the scanning coil according to the first embodiment.

[0024] Fig.11 This is a second partial cross-sectional view showing a state where the electric conducting wire 120 is attached to the winding frame in the method for manufacturing the scanning coil according to the first embodiment.

[0025] Fig.12 This is a longitudinal sectional view showing a core constituting a resin injection device in the method for manufacturing the scanning coil according to the first embodiment.

[0026] Fig.13 It is a longitudinal sectional view showing a small-diameter-side end closing member constituting a resin injection device in the method for manufacturing the scanning coil according to the first embodiment.

[0027] Fig.14 It is a longitudinal sectional view showing a large-diameter-side end closing member constituting a resin injection device in the method for manufacturing the scanning coil according to the first embodiment.

[0028] Fig.15 This is a longitudinal sectional view showing an outer cylinder constituting a resin injection device in the method for manufacturing a scanning coil according to the first embodiment.

[0029] Fig.16 This is a longitudinal sectional view showing a state of a winding frame to which an electric conducting wire is attached during resin injection in the method for manufacturing a scanning coil according to the first embodiment.

[0030] Fig.17 This is a longitudinal sectional view showing a state of the resin injection assembly during resin injection in the method for manufacturing the scanning coil according to the first embodiment.

[0031] Fig.18 This is a first partial cross-sectional view showing a state after resin injection in the method for manufacturing the scanning coil according to the first embodiment.

[0032] Fig.19This is a second partial cross-sectional view showing a state after resin injection in the method for manufacturing the scanning coil according to the first embodiment.

[0033] Fig. 20 It is a partial plan view showing a layout path including a widened portion formed in a main body portion of a scanning coil according to the second embodiment.

[0034] Fig.21 This is a partial perspective view showing the periphery of the widened portion during resin injection in the method for manufacturing the scanning coil according to the second embodiment. DETAILED DESCRIPTION

[0035] Hereinafter, a scanning coil, a scanning magnet, and a method for manufacturing a scanning coil according to an embodiment of the present invention will be described with reference to the drawings. Here, identical or similar parts are denoted by common reference numerals, and duplicate descriptions are omitted.

[0036] [First embodiment]

[0037] Figure 1 It is a longitudinal cross-sectional view showing the scanning magnet according to the first embodiment, that is, a cross-sectional view along the longitudinal direction.

[0038] The scanning magnet 200 includes a beam guide 210 and two scanning coils 100 .

[0039] The beam guide tube 210 is a guide tube that forms a space for the beam to fly toward the irradiation object. A portion of the scanning magnet 200 is formed to widen from the small diameter portion 210a toward the large diameter portion 210b in the flight direction of the beam so as to enable the beam to scan the irradiation object and to cover the change in the angle of the beam.

[0040] The two scanning coils 100 are formed integrally with each other so as to sandwich the beam guide tube 210 from the radially outer side, and are configured to be able to change the direction of the beam. Figure 1 In the vertical direction ( Figure 1 Usually, a coil is provided on the outside of the radial direction in the horizontal direction ( Figure 1 The scanning coil that changes the direction of the beam (in the near and depth directions) can scan the irradiated object two-dimensionally. Figure 1 The illustration of the scanning coil in the horizontal direction is omitted. The scanning coil in the vertical direction is described below, but the scanning coil in the horizontal direction is also the same.

[0041] The scanning coil 100 includes a winding frame 110, an electric wire 120, and a resin portion 130. The details of each will be described later. The scanning coils 100 are manufactured separately, and two scanning coils 100 are finally assembled as one body, so the structure and manufacturing method of one scanning coil 100 will be described in sequence below.

[0042] Figure 2 1 is a flowchart showing the steps of the method for manufacturing the scanning coil according to the first embodiment.

[0043] First, a reel is produced (step S01).

[0044] Figure 3 This is a flowchart showing the detailed steps of manufacturing a winding frame in the method for manufacturing the scanning coil according to the first embodiment.

[0045] To make a winding frame, first, the winding frame component 110a ( Figure 4 , Figure 5 ) is produced (step S01a).

[0046] Figure 4 The structure of the winding frame member 110a produced in the method for producing the scanning coil according to the first embodiment is shown. Figure 5 The cross-sectional view along line IV-IV, Figure 5 yes Figure 4 Sectional view along line VV.

[0047] The reel member 110a is made of an electrically insulating material such as fiber reinforced plastics (FRP) and is usually formed by injection molding. The reel member 110a has a main body 111 that is semicircular in cross section and tapered in the longitudinal direction, that is, the cross section continuously expands in the longitudinal direction.

[0048] In other words, the main body 111 is a shape that is rotated 180 degrees around the central axis C extending in the longitudinal direction. Therefore, by integrating the two winding frame components 110a in a mutually opposed state, a shape of a rotating body that rotates 360 degrees is formed. Therefore, in the following description, there is a case where a 360-degree rotating body (hereinafter referred to as a rotating body) is described. The winding frame component 110a in this embodiment is obtained by dividing the rotating body into two equal parts in the circumferential direction. In other words, it is divided by a plane including the central axis C.

[0049] The main body 111 of the reel member 110a is in a truncated cone-shaped cylindrical shape when two parts are integrated. That is, it is formed to linearly expand from the small diameter side end 111a to the large diameter side end 111b in the longitudinal direction, and its inner surface is in contact with the truncated cone-shaped virtual curved surface S.

[0050] As the winding rack is made, the laying path 113 ( Figure 6 to Figure 8 Specifically, the main body 111 is provided with a routing path 113, that is, the electrical conductor 120 ( Fig.10 ) passage.

[0051] In addition, from the perspective of heat dissipation, the occupancy rate of the electric conductor 120 relative to the cross-sectional area of ​​the layout path 113 is preferably 50 to 95%. If the occupancy rate is less than 50%, the configuration accuracy of the magnetic field is reduced. In addition, if it exceeds 95%, the configuration shape of the electric conductor 120 is distorted, and the configuration accuracy of the magnetic field is also reduced.

[0052] Figure 6 The structure of the winding frame produced in the method for producing the scanning coil according to the first embodiment is shown. Figure 8 The cross-sectional view along line VI-VI, Figure 7 yes Figure 8 The cross-sectional view along line VII-VII, Figure 8 yes Figure 6 The cross-sectional view along the line VIII-VIII. In addition, Fig. 9 It is a perspective view showing the vicinity of the end portion on the large diameter side of the reel. Figure 6 to Figure 9 The state of the wire reel 110 after the wiring path 113 is formed in the main body 111 is shown.

[0053] like Figure 6 to Figure 8 As shown, the layout path 113 has a plurality of long strip portions 113a, a plurality of small diameter portions 113b and a plurality of large diameter portions 113c formed in the length direction. Figure 8 and Fig. 9 The case where there are eight long strip portions 113 a and four small diameter portions 113 b and large diameter portions 113 c is shown as an example, but the respective numbers are only examples and are determined by the number of turns of the scanning coil 100 .

[0054] The strip portion 113a, the small diameter portion 113b, and the large diameter portion 113c of the routing path 113 formed in the main body 111 all extend from the outer surface of the main body 111 to the inner surface. That is, the main body 111 is cut by the routing path 113, but the overall shape is maintained by the retaining portion 112 and the length direction retaining portions 112a and 112b provided on the inner surface of the main body 111 at intervals in the axial direction.

[0055] like Figure 8 and Fig. 9 As shown, each of the plurality of elongated portions 113a extends in the length direction at intervals from each other in the circumferential direction, and connects the small diameter portion 113b with the large diameter portion 113c. Fig. 9 , but the connecting parts of the strip part 113a and the small diameter part 113b and the large diameter part 113c are formed to have a wiring conductor 120 ( Fig.10 )The shape of the radius above the required radius of curvature.

[0056] The plurality of elongated portions 113 a may be formed parallel to each other, or may be formed along the intersection line between the imaginary plane including the central axis C and the main body 111 .

[0057] The wiring path 113 is formed as a continuous passage so as to form a coil by installing the electric conductor 120 along the wiring path 113. Although not shown, the starting point or the end point of the installation of the electric conductor 120 is the inside of the small diameter part 113b or the inside of the large diameter part 113c.

[0058] The layout path 113 passes through the outer side of the main body 111 and extends to the inner side. Figure 7 and Fig. 9 As shown in FIG. 1 , the retaining portions 112 are formed at intervals in the length direction. The retaining portions 112 are portions where the routing path 113 does not pass from the outside to the inside of the main body 111. By forming the retaining portions 112, the portions of the main body 111 cut by the routing path 113 can maintain a relative positional relationship. Fig. 9 As shown, in addition to the holding portion 112, a holding portion 112b is provided in the longitudinal direction on the large diameter side end portion 111b as a portion having a holding function. Although not shown, a similar holding portion is also formed on the small diameter side end portion 111a.

[0059] Next, in step S01, the electric conducting wire 120 is mounted on the produced winding frame 110 (step S02). Here, the electric conducting wire 120 is preferably a stranded wire in order to promote the impregnation of the resin.

[0060] Fig.10 1 is a first cross-sectional view showing a state where the electric wire 120 is mounted on the winding frame in the method for manufacturing the scanning coil according to the first embodiment. Fig.11 This is the second cross-sectional view. Fig.10 The state where the electric conductor 120 is installed in the portion of the long strip portion 113a of the routing path 113 where the holding portion 112 is not formed is shown. Fig.11The state where the electric conductor 120 is attached to the portion of the long portion 113 a of the routing path 113 where the holding portion 112 is formed is shown.

[0061] The electric wire 120 is installed by being pressed into the routing path 113 of the reel 110. The routing path 113 is open to the inside of the main body 111, but the holding parts 112 are arranged at intervals, and the electric wire 120 has a certain degree of rigidity, so the electric wire 120 does not protrude to the inside of the main body 111. Therefore, the electric wire 120 can be installed in a stable state inside the routing path 113 along the routing path 113.

[0062] Next, the electric wire 120 is temporarily fixed by a tape or the like (step S03). Since the electric wire 120 is long and the scanning coil 100 is a saddle coil, it is not in the same plane but is arranged three-dimensionally, so the electric wire 120 is temporarily fixed by a tape such as a peelply so that the arrangement of the electric wire 120 will not be disturbed even by subsequent resin injection or the like.

[0063] At this time, by pre-arranging a hole of about 0.5 mm to 10 mm in diameter through which the resin can pass in a part of the release cloth, the penetration of the resin during the subsequent process becomes reliable, and the fixing of the electric wire can be achieved with higher reliability. In addition, regarding the hole diameter, if it is less than 0.5 mm, clogging will occur and the passage of the resin will be hindered, and if it exceeds 10 mm, the wire cannot be fixed, so it is preferably about 0.5 mm to 10 mm in diameter.

[0064] Next, the resin injection assembly 10 ( Fig.17 )(Step S04).

[0065] Fig.12 A longitudinal sectional view showing a core 11 constituting a resin injection device in the method for manufacturing a scanning coil according to the first embodiment, Fig.13 1 is a longitudinal sectional view showing the small diameter side end closing member 13, Fig.14 1 is a longitudinal sectional view showing the large diameter side end closing member 14, Fig.15 1 is a longitudinal sectional view showing the outer cylinder 12. Fig.16 1 is a longitudinal sectional view showing the state of two winding frames 110 with the electric wire 120 installed when the resin is injected. Fig.16 The electrical conductor 120 is omitted.

[0066] As for the core 11, its outer surface has Figure 4 The inner surface of the reel 110 shown in FIG. 1 is a truncated cone shape corresponding to the inner surface of the reel 110. As for the outer cylinder 12, its inner surface is Fig.16The outer surfaces of the two reels 110 in the state shown correspond to each other in shape and are formed in contact with the outer surfaces of the two reels 110. The small diameter side end closing member 13 and the large diameter side end closing member 14 are formed so as to be fitted with the small diameter side and the large diameter side of the outer tube 12, respectively. In addition, an external thread is formed on the inner surface of the outer tube 12 of this part, and an internal thread is formed on the outer surface of the small diameter side end closing member 13 and the large diameter side end closing member 14, and they can be formed in a threaded connection.

[0067] Fig.17 This is a longitudinal sectional view showing a state during resin injection in the method for manufacturing the scanning coil according to the first embodiment.

[0068] By assembling the above components as a whole, a Fig.17 The resin injection assembly 10 shown in FIG. Fig.17 Although not shown in the figure, an injection port for resin injection is formed at any part of the outer cylinder 12, the small diameter side end closing member 13, and the large diameter side end closing member 14. In addition, an exhaust port for exhaust is similarly formed at any part of the outer cylinder 12, the small diameter side end closing member 13, and the large diameter side end closing member 14. The exhaust port can be connected to a vacuum pump for vacuum suction.

[0069] Next, a thermosetting resin is injected and impregnated (step S05). At this time, the resin may be injected from the injection port and the internal gas may be exhausted from the exhaust port. Alternatively, the resin may be injected from the injection port after vacuum suction is first performed from the exhaust port.

[0070] If anhydride-cured epoxy resin is used as the thermosetting resin, the resin can be effectively infiltrated between the winding frame 110 and the electric conductor 120 due to the time and viscosity of the resin until it gels. In addition, by filling fused silica, crystalline silica, alumina, and magnesium oxide at a volume filling rate of 30% by volume or more, the thermal conductivity of the epoxy resin is improved, and the heat generated by the electric conductor when the scanning coil 100 is energized can be efficiently dissipated.

[0071] Next, the thermosetting resin is cured by heating (step S06 ).

[0072] After the resin is cured, the scanning coil 100 is demolded (step S07 ). At this time, the tape used for temporary fixing in step S03 is also removed.

[0073] Fig.18 is a first partial cross-sectional view showing a state after resin injection in the method for manufacturing the scanning coil according to the first embodiment, Fig.19 This is the second cross-sectional view. Fig.18 The portion where the holding portion 112 is not formed in the long strip portion 113a of the layout path 113 is located. Fig.19 The portion where the holding portion 112 is not formed in the long portion 113 a of the routing path 113 is shown.

[0074] A resin portion 130 formed by curing the thermosetting resin is formed in the routing path 113 so as to surround the electric conductor 120 .

[0075] Next, assemble the scanning magnet 200 ( Figure 1 ) (Step S08). Specifically, the two reels 110 are integrated on the radially outer side of the beam duct 210 so as to surround the beam duct 210 and face each other. In order to maintain the relative positional relationship between the beam duct 210 and the reel 110, a partition (not shown) may be provided.

[0076] As described above, according to this embodiment, the electric conducting wires can be arranged with high precision.

[0077] [Second Embodiment]

[0078] Fig. 20 1 is a partial plan view showing a routing path 113 including a widened portion 113 w formed in a main body portion 111 of a scanning coil according to the second embodiment.

[0079] The second embodiment is a modification of the first embodiment, and a widened portion 113w is formed in a part of the wiring path 113. Other aspects are the same as those of the first embodiment.

[0080] The widened portion 113w is formed at a position where the holding portion is arranged in the main body 111. The width of the routing path 113 is expanded at the widened portion 113w. In other words, the widened portion 113w is a cutout formed in the routing path 113. The shape of the widened portion 113w when viewed from above is Fig. 20 and Fig.21 The semi-elliptical shape is used as an example, but the shape is not limited thereto. For example, the shape may be a rectangle or a polygon. Fig. 20 , Fig.21 As shown, the plane is shown as an example of being arranged in a part of the widened portion 113w, but it can also be a shape that extends to the entire width of the widened portion 13w in the longitudinal direction.

[0081] Fig.21 This is a partial perspective view showing the periphery of the widened portion 113w when the resin is injected in the method for manufacturing the scanning coil according to the second embodiment. In addition, the electric conducting wire 120 and the outer cylinder 12 are omitted from the illustration. Fig.21 The direction of resin flow is shown by white arrows.

[0082] Due to the presence of the widened portion 113w, the space in the widened portion 113w is connected to the passage on the upstream side through the opening S1. In addition, the space in the widened portion 113w is connected to the passage on the downstream side through the opening S2. That is, the passage on the upstream side is connected to the passage on the downstream side from the opening S1 through the widened portion 113w, and from the widened portion 113w through the opening S2. Fig.21 The liquid flows from the upstream side to the downstream side as shown by arrows F1 and F2.

[0083] With such a configuration, filling can be performed reliably by resin injection.

[0084] [Other embodiments]

[0085] The embodiments of the present invention have been described above, but the embodiments are shown as examples and are not intended to limit the scope of the invention. For example, in the embodiments, the scanning coil is assembled by integrating the winding frame divided in half, but the invention is not limited to this. For example, in the case where the beam guide is formed as an integral part of the scanning magnet in addition to the beam guide of the connection target, it can also be manufactured in an integral shape from the beginning instead of being divided in half.

[0086] In the embodiment, the resin injection assembly 10 is constructed and resin is injected, but the present invention is not limited thereto. For example, the electrical conductor 120 may be installed in the routing path 113 and temporarily fixed, and then the resin may be applied using a brush or the like.

[0087] In addition, the features of these embodiments may be combined. In addition, the embodiments may be implemented in various other forms, and various omissions, substitutions, and changes may be made without departing from the gist of the invention.

[0088] The embodiments and modifications thereof are included in the scope and gist of the invention, and are also included in the invention described in the claims and their equivalents.

[0089] Description of Reference Numerals

[0090] 10…Assembly for resin injection, 11…Core, 12…Outer cylinder, 13…Small diameter side end closing member, 14…Large diameter side end closing member, 100…Scanning coil, 110…Reel, 110a…Reel for member, 111…Main body, 111a…Small diameter side end, 111b…Large diameter side end, 112…Retaining portion, 112a, 112b…Length direction retaining portion, 113…Laying path, 113a…Elongated portion, 113b…Small diameter portion, 113c…Large diameter portion, 113w…Wide width portion, 120…Electric wire, 130…Resin portion, 200…Scanning magnet, 210…Beam guide tube, 210a…Small diameter portion, 210b…Large diameter portion

Claims

1. A scanning coil, characterized in that: have: A winding frame, comprising a main body portion formed of an electrically insulating material and having a cylindrical shape of a truncated cone in an integrated or assembled state, a layout path formed as a groove in a manner penetrating the main body portion from the radially outer side to the inner side of the main body portion, and a plurality of retaining portions formed on the inner peripheral surface side of the main body portion at intervals in the axial direction along the layout path; an electric conductor installed in the routing path of the winding frame; as well as a resin portion, fixing the electric conductor within the routing path, The main body is cut off by the routing path, The plurality of retaining portions are portions that do not penetrate the main body portion from the radially outer side to the inner side of the main body portion and maintain the relative positional relationship of the portions of the main body portion that are cut off by the layout path. The layout path has a plurality of long strip portions, a plurality of small diameter portions and a plurality of large diameter portions formed in the length direction. The elongated portion, the small diameter portion, and the large diameter portion of the layout path formed in the main body all extend from the outer surface of the main body to the inner surface. Each of the plurality of elongated portions extends in the length direction at intervals from each other in the circumferential direction and connects the small diameter portion with the large diameter portion. The electrical conductors are installed along the routing path, The resin portion is formed to surround the electric conductor within the routing path, The holding portion prevents the electric wire from protruding to the inner side of the main body portion.

2. The scanning coil according to claim 1, characterized in that: The electric conductor occupies 50% to 95% of the layout path.

3. The scanning coil according to claim 1 or 2, characterized in that: The winding frame is made of fiber reinforced plastic material.

4. The scanning coil according to claim 1 or 2, characterized in that: The reel is formed by integrating two reels facing each other to form a rotating body.

5. The scanning coil according to claim 1 or 2, characterized in that: As the resin, an anhydride-cured epoxy resin was used.

6. A scanning magnet, characterized in that: have beam catheter; as well as The scanning coil according to any one of claims 1 to 5 is arranged radially outside the beam guide tube and surrounds the radially outside of the beam guide tube.

7. A method for manufacturing a scanning coil, characterized in that: have: A wire reel manufacturing step of manufacturing a wire reel having a routing path as a slot for installing the electric wire; An electric wire installation step, installing the electric wire in the routing path of the winding rack; A resin injection step of forming an assembly for resin injection and injecting resin into the routing path and curing the resin to form a resin portion; as well as a demolding step of demolding a scanning coil from the resin injection assembly, the scanning coil having the winding frame, the electric wire, and the resin portion, The winding frame comprises a main body part formed of an electrically insulating material and having a cylindrical shape of a truncated cone in an integrated or assembled state, the routing path formed in a manner penetrating the main body part from the radially outer side to the inner side of the main body part, and a plurality of retaining parts formed on the inner peripheral surface side of the main body part at intervals in the axial direction along the routing path. The main body is cut off by the routing path, The plurality of retaining portions are portions that do not penetrate the main body portion from the radially outer side to the inner side of the main body portion and maintain the relative positional relationship of the portions of the main body portion that are cut off by the layout path. The layout path has a plurality of long strip portions, a plurality of small diameter portions and a plurality of large diameter portions formed in the length direction. The elongated portion, the small diameter portion, and the large diameter portion of the layout path formed in the main body all extend from the outer surface of the main body to the inner surface. Each of the plurality of elongated portions extends in the length direction at intervals from each other in the circumferential direction and connects the small diameter portion with the large diameter portion. The electrical conductor is installed along the routing path, The resin portion is formed to surround the electric conductor within the routing path, The holding portion prevents the electric wire from protruding to the inner side of the main body portion.

8. The method for manufacturing a scanning coil according to claim 7, characterized in that: The production steps of the winding rack include: a main body manufacturing step, manufacturing the main body; and The routing path forming step is to form the routing path and the holding portion in the main body.

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