A transformer comprises at least two windings and each of the at least two windings includes at least one lead-out wire, and a silicone rubber heat-shrinkable sleeve is wrapped around the outer surface of the lead-out wire. The at least two windings and a portion of the silicone rubber heat-shrinkable sleeve are encapsulated in a potting box with a first potting sealant, and another portion of the silicone rubber heat-shrinkable sleeve is exposed outside of the potting box.

A potting box for assembling a transformer comprises an inner wall and an outer wall. The inner wall is sleeved in the outer wall. A bottom plate connected to a bottom portion of the inner wall and a bottom portion of the outer wall to form a potting space for accommodating a first winding and a second winding. An inner side of the outer wall comprises a first support portion for supporting the first winding and an outer side of the inner wall comprises a second support portion for supporting the second winding. An iron core of the transformer penetrates through an inner side of the inner wall.

An ignition coil, including: a center core; a primary coil wound around the center core; a secondary coil wound around the primary coil; a side core, which is arranged around the secondary coil, and is coupled to the center core to from a closed magnetic path; a case configured to accommodate the center core, the primary coil, the secondary coil, and the side core; and an insulating resin filled in the case, wherein the side core includes a wide portion having a larger width in a direction from the center core to the side core, and a narrow portion having a smaller width than the wide portion, and wherein the narrow portion is formed on a high-voltage side of the side core.

A laminate includes multiple paper layers, with at least one induction coil comprising first and second sets of windings. Two or more paper layers include the sets of windings comprising an electrically-conductive material. The sets of windings may be distributed throughout the laminate layers and provide good wireless induction charging performance in a compact space.

A reactor including: a coil that includes a winding portion; a magnetic core that includes an inner core portion that is disposed inside the winding portion and an outer core portion that is disposed outside the winding portion; and an outer interposed portion that is interposed between an end surface of the winding portion and an inner end surface of the outer core portion The winding portion includes a winding wire body and a fusing layer that is provided on an outer circumferential surface of the winding wire body and joins turns that are adjacent to each other, and the reactor further includes an adhesion prevention structure configured to prevent the end surface of the winding portion and the outer interposed portion from adhering to each other due to the fusing layer.

A coil component is provided with a coil part in which a plurality of conductor layers and a plurality of interlayer insulating layers are alternately laminated; and a sealing resin layer that covers the coil part. The conductor layers each include a spiral pattern. The interlayer insulating layers each cover an upper surface and a side surface of the spiral pattern. The recessed part is formed in the side wall surface of the interlayer insulating layer. A part of the sealing resin layer is embedded in the recessed part.

A laminate includes multiple paper layers, with at least one induction coil comprising first and second sets of windings. Two or more paper layers include the sets of windings comprising an electrically-conductive material. The sets of windings may be distributed throughout the laminate layers and provide good wireless induction charging performance in a compact space.

A coil component including an element assembly that contains a filler and a resin material, a coil portion composed of a coil conductor that is embedded in the element assembly, and a pair of outer electrodes electrically connected to the coil conductor. The outer electrodes are disposed on a lower surface, and the coil axis of the coil portion is parallel to a mounting surface.

A coil component includes a molded portion having one surface and another surface opposing each other, and a wound coil disposed on the one surface of the molded portion and including an innermost turn, at least one intermediate turn, and an outermost turn disposed outwardly of a central portion of the one surface of the molded portion. A cover portion is disposed to face the one surface of the molded portion and to cover the wound coil, and first and second external electrodes are connected to the wound coil and arranged to be spaced apart from each other on the other surface of the molded portion. A thickness of one region of the cover portion disposed on the innermost turn is thicker than a thickness of another region of the cover portion disposed on the outermost turn.

A coil component is provided. The coil component includes a body having one surface and the other surface, opposing each other, and including a plurality of wall surfaces respectively connecting the one surface and the other surface, a coil portion embedded in the body, first and second external electrodes spaced apart from each other on one surface of the body, and respectively connected to the coil portion, a groove formed continuously along an edge of the other surface of the body, and a stress relieving portion disposed on the other surface of the body to fill at least a portion of the groove.