Small electronic component, electronic circuit board, and method of manufacturing small electronic component
First Claim
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1. A small electronic component, comprising:
- a magnetic core comprising at least a columnar core part;
a winding coil arranged so as to surround an outer peripheral surface side of the columnar core part and formed by winding a winding wire; and
a magnetic cover part formed so as to cover at least part of the magnetic core and the winding coil while following at least part of shapes of the magnetic core and the winding coil through use of a magnetic material containing a mixture of a phosphoric acid ester-based surfactant, magnetic powder, and a resin,wherein the magnetic material satisfies the following expressions (1) and (2A) to (5A);
D+M+R=100
Expression (1)
M≥
90.5
Expression (2A)
R≥
3.5
Expression (3A)
R≤
−
M+99.95
Expression (4A)
R≥
−
M+96.5
Expression (5A)where D represents the content (mass %) of the phosphoric acid ester-based surfactant in the magnetic material, M represents the content (mass %) of the magnetic powder in the magnetic material, and R represents the content (mass %) of the resin in the magnetic material.
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Abstract
Provided are a small electronic component including: a magnetic core including at least a columnar core part; a winding coil arranged so as to surround an outer peripheral surface side of the columnar core part and formed by winding a winding wire; and a magnetic cover part formed so as to cover at least part of the magnetic core and the winding coil while following at least part of shapes of the magnetic core and the winding coil through use of a magnetic material containing a mixture of a phosphoric acid ester-based surfactant, magnetic powder, and a resin, an electronic circuit board using the small electronic component, and a method of manufacturing a small electronic component.
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Citations
11 Claims
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1. A small electronic component, comprising:
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a magnetic core comprising at least a columnar core part; a winding coil arranged so as to surround an outer peripheral surface side of the columnar core part and formed by winding a winding wire; and a magnetic cover part formed so as to cover at least part of the magnetic core and the winding coil while following at least part of shapes of the magnetic core and the winding coil through use of a magnetic material containing a mixture of a phosphoric acid ester-based surfactant, magnetic powder, and a resin, wherein the magnetic material satisfies the following expressions (1) and (2A) to (5A);
D+M+R=100
Expression (1)
M≥
90.5
Expression (2A)
R≥
3.5
Expression (3A)
R≤
−
M+99.95
Expression (4A)
R≥
−
M+96.5
Expression (5A)where D represents the content (mass %) of the phosphoric acid ester-based surfactant in the magnetic material, M represents the content (mass %) of the magnetic powder in the magnetic material, and R represents the content (mass %) of the resin in the magnetic material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An electronic circuit board, comprising at least a wiring board having wiring patterned thereon and a small electronic component,
wherein the small electronic component comprises: -
a magnetic core comprising at least a columnar core part; a winding coil arranged so as to surround an outer peripheral surface side of the columnar core part and formed by winding a winding wire; and a magnetic cover part formed so as to cover at least part of the magnetic core and the winding coil while following at least part of shapes of the magnetic core and the winding coil through use of a magnetic material containing a mixture of a phosphoric acid ester-based surfactant, magnetic powder, and a resin, wherein the magnetic material satisfies the following expressions (1) and (2A) to (5A);
D+M+R=100
Expression (1)
M≥
90.5
Expression (2A)
R≥
3.5
Expression (3A)
R≤
−
M+99.95
Expression (4A)
R≥
−
M+96.5
Expression (5A)where D represents the content (mass %) of the phosphoric acid ester-based surfactant in the magnetic material, M represents the content (mass %) of the magnetic powder in the magnetic material, and R represents the content (mass %) of the resin in the magnetic material. - View Dependent Claims (11)
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Specification