Coil component and drum-like core

A coil component comprising:

• a drum-like core that includes a winding core portion, a flange portion, and a terminal electrode, the flange portion being provided on one end portion of the winding core portion in a length direction and having a mounting surface constituted by an end portion of the flange portion in a height direction perpendicular to the length direction, the terminal electrode being provided on the mounting surface of the flange portion;
• and
• a wire that is wound around the winding core portion, an end portion of the wire being connected to the terminal electrode, wherein
• the mounting surface of the flange portion includes a flat region and a lower region, the flat region extending in parallel with the length direction and being positioned in an outermost side portion in the height direction, the lower region being positioned further in an inner side portion in the height direction than the flat region, the flat region and the lower region being arranged in a direction along the end portion of the wire,
• the terminal electrode has a flat surface, the flat surface being parallel with the length direction in an outer surface of the terminal electrode, covering the mounting surface of the flange portion, and being longer than the flat region in maximum measurement extending in parallel with the length direction, and
• a maximum step between the flat region and the lower region along the height direction is 40 μm or less.

A coil component comprising:

• a drum-like core that includes a winding core portion, a flange portion, and a terminal electrode, the flange portion being provided on one end portion of the winding core portion in a length direction and having a mounting surface constituted by an end portion of the flange portion in a height direction perpendicular to the length direction, the terminal electrode being provided on the mounting surface of the flange portion;
• and
• a wire that is wound around the winding core portion, an end portion of the wire being connected to the terminal electrode, wherein
• the mounting surface of the flange portion includes a flat region and a lower region, the flat region extending in parallel with the length direction and being positioned in an outermost side portion in the height direction, the lower region being positioned further in an inner side portion in the height direction than the flat region, the flat region and the lower region being arranged in a direction along the end portion of the wire,
• the terminal electrode has a flat surface, the flat surface being parallel with the length direction in an outer surface of the terminal electrode, covering the mounting surface of the flange portion, and being longer than the flat region in maximum measurement extending in parallel with the length direction, and
• a first round surface and a second round surface are configured in edge portions of the lower region on sides that are toward the flat region and opposite the flat region, respectively.

A drum-like core for a coil component comprising:

• a drum-like core that includes a winding core portion, a flange portion, and a terminal electrode, the flange portion being provided on one end portion of the winding core portion in a length direction and having a mounting surface constituted by an end portion of the flange portion in a height direction perpendicular to the length direction, the terminal electrode being provided on the mounting surface of the flange portion;
• and
• a wire that is wound around the winding core portion, an end portion of the wire being connected to the terminal electrode, wherein
• the mounting surface of the flange portion includes a flat region and a lower region, the flat region extending in parallel with the length direction and being positioned in an outermost side portion in the height direction, the lower region being positioned further in an inner side portion in the height direction than the flat region, the flat region and the lower region being arranged in a direction along the end portion of the wire,
• the terminal electrode has a flat surface, the flat surface being parallel with the length direction in an outer surface of the terminal electrode, covering the mounting surface of the flange portion, and being longer than the flat region in maximum measurement extending in parallel with the length direction,
• the drum-like core comprising:
• a pre-terminal electrode to which the end portion of the wire is to connect and that is provided on the mounting surface of the flange portion, wherein
• an outer surface of the pre-terminal electrode is constituted by a tin containing layer, and
• when viewed from a direction orthogonal to the flat region of the mounting surface, the lower region has an area that is smaller than or equal to an area of the flat region, and a step between the flat region and the lower region along the height direction is smaller than or equal to double of a thickness of the tin containing layer of the pre-terminal electrode.