Scanning coil, scanning magnet, and method for manufacturing scanning coil

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.