Coil component and wireless power transmission circuit having the same

A wireless power transmission circuit comprising:

• a coil component;
• and
• a resonance circuit connected to the coil component,
• wherein the coil component comprises:
• a substrate;
• and
• a first coil pattern formed on one surface of the substrate and spirally wound in a plurality of turns,
• wherein the plurality of turns include at least three turns that include an innermost turn positioned at an innermost periphery, an outermost turn positioned at an outermost periphery, and a middle turn whose turn number counted from the innermost or outermost turn is intermediate among all the turns,
• wherein the first coil pattern has a center position of a line length,
• wherein the first coil pattern is designed such that a pattern width at the center position is larger than pattern widths of the innermost and outermost turns,
• wherein the first coil pattern is designed such that a total or average value of pattern widths of turns positioned between the outermost turn and the middle turn is larger than a total or average value of pattern widths of turns positioned between the innermost turn and the middle turn,
• wherein a pattern thickness of the first coil pattern is smaller than a skin depth of current flowing in the first coil pattern at a resonance frequency,
• wherein each of the plurality of turns constituting the first coil pattern is constituted of a plurality of conductive patterns including first and second conductive patterns radially divided by a spiral-shaped slit,
• wherein the plurality of conductive patterns further include a third conductive pattern,
• wherein the first and second conductive patterns are radially divided by a first spiral-shaped slit, and
• wherein the second and third conductive patterns are radially divided by a second spiral-shaped slit.

A coil component comprising:

• a magnetic sheet;
• and
• first and second coil patterns, each of the first and second coil patterns being spirally wound in a plurality of turns and disposed so as to overlap the magnetic sheet in a plan view,
• wherein the first and second coil patterns are connected in parallel,
• wherein the first coil pattern is disposed closer to the magnetic sheet than the second coil pattern,
• wherein a line length of the second coil pattern is larger than that of the first coil pattern,
• wherein each of the first and second coil patterns has an innermost turn positioned at an innermost periphery, an outermost turn positioned at an outermost periphery, a middle turn whose turn number counted from the innermost or outermost turn is intermediate among all the turns, and a center position of a line length,
• wherein the first coil pattern is designed such that a pattern width at the center position is larger than pattern widths of the respective innermost and outermost turns,
• wherein the first coil pattern is designed such that a total or average value of pattern widths of the turns positioned between the outermost turn and the middle turn is larger than a total or average value of the pattern widths of the turns positioned between the innermost turn and the middle turn,
• wherein the second coil pattern is designed such that a pattern width at the center position is larger than pattern widths of the respective innermost and outermost turns,
• wherein the second coil pattern is designed such that a total or average value of pattern widths of the turns positioned between the outermost turn and the middle turn is larger than a total or average value of the pattern widths of the turns positioned between the innermost turn and the middle turn, and
• wherein an inner diameter of the second coil pattern is larger than that of the first coil pattern.

A coil component comprising:

• a magnetic sheet;
• and
• first and second coil patterns, each of the first and second coil patterns being spirally wound in a plurality of turns and disposed so as to overlap the magnetic sheet in a plan view;
• third and fourth coil patterns, each of the third and fourth coil patterns being spirally wound in a plurality of turns;
• and
• first and second substrates disposed so as to overlap the magnetic sheet in a plan view,
• wherein the first and second coil patterns are connected in parallel,
• wherein the first coil pattern is disposed closer to the magnetic sheet than the second coil pattern,
• wherein a line length of the second coil pattern is larger than that of the first coil pattern,
• wherein the first coil pattern is formed on one surface of the first substrate, and
• wherein the second coil pattern is formed on one surface of the second substrate,
• wherein the third coil pattern is formed on other surface of the first substrate,
• wherein the fourth coil pattern is formed on other surface of the second substrate,
• wherein an inner peripheral end of the first coil pattern and that of the third coil pattern are connected to each other,
• wherein an inner peripheral end of the second coil pattern and that of the fourth coil pattern are connected to each other, and
• wherein a line length of the fourth coil pattern is larger than that of the third coil pattern.

A coil component comprising:

• a magnetic sheet;
• and
• first and second coil patterns, each of the first and second coil patterns being spirally wound in a plurality of turns and disposed so as to overlap the magnetic sheet in a plan view,
• wherein the first and second coil patterns are connected in parallel,
• wherein the first coil pattern is disposed closer to the magnetic sheet than the second coil pattern,
• wherein a line length of the second coil pattern is larger than that of the first coil pattern,
• wherein the plurality of turns of the first coil pattern includes a first predetermined turn,
• wherein the plurality of turns of the second coil pattern includes a second predetermined turn, and
• wherein the first and second predetermined turns overlap each other as viewed from an axial direction of the first and second coil patterns.