Scanning coil, scanning magnet, and method for manufacturing scanning coil
According to an embodiment, a scanning coil includes a bobbin, a conducting wire, and a resin for fixing the conducting wire. The bobbin includes a main body having a truncated conical cylindrical outer shape in an integrated or assembled state and made of an electrically insulating material, a wire-laying path which is formed in the main body and in which a conducting wire is installed, and a plurality of holding parts formed along the wire-laying path on an inner peripheral surface side of the main body and with axial intervals therebetween.
1. A scanning coil comprising:
a bobbin including
a main body having a truncated conical cylindrical outer shape in an integrated or assembled state and made of an electrically insulating material,
a wire-laying path formed in the main body, the wire-laying path penetrating the main body from the outside to the inside of the main body to cut thereof,
the wire-laying path having a plurality of long-side parts formed in the longitudinal direction, a plurality of small-diameter parts, and a plurality of large-diameter parts,
each of the long-side parts, the small-diameter parts, and the large-diameter parts formed in the main body reaching the inside surface from the outside surface of the main body,
the plurality of long-side parts individually extending in the longitudinal direction with circumferential intervals therebetween to connect the small-diameter parts and the large-diameter parts to form the wire-laying path, and
a plurality of holding parts formed along the wire-laying path on an inner peripheral surface side of the main body with axial intervals therebetween to bridge across the wire-laying path for maintaining whole shape of the cut main body;
a conducting wire installed along within the wire-laying path of the bobbin, the conducting wire not projecting to an interior side of the main body by the plurality of holding parts; and
a resin part filled in the wire-laying path impregnated between the bobbin and the conducting wire, the resin part surrounding the conducting wire for fixing the conducting wire within the wire-laying path.
2. The scanning coil according to claim 1 , wherein
an occupancy rate of the conducting wire in the wire-laying path is 50% to 95%.
3. The scanning coil according to claim 1 , wherein
the bobbin is a fiber reinforced plastic material.
4. The scanning coil according to claim 1 , wherein
the bobbin forms a rotation body by integrating two bobbins together to face each other.
5. The scanning coil according to claim 1 , wherein
the resin uses an anhydride-curing epoxy resin.
6. A scanning magnet comprising:
a beam duct; and
the scanning coil according to claim 1 arranged on an outside in a radial direction of the beam duct to surround the outside in the radial direction of the beam duct.