Abstract:
PROBLEM TO BE SOLVED: To prevent the increase of the most outer periphery of a plane surface spiral conductor, and also to secure the areas of external electrodes.SOLUTION: A coil component 1 includes: a substrate 2; a plane surface spiral conductor 10a formed on a front surface 2t of the substrate 2 by electrolytic plating; a lead-out conductor 11a connected to the outer peripheral end of the plane surface spiral conductor 10a; a dummy lead-out conductor 15a that is formed between the most outer periphery of the plane surface spiral conductor 10a and an end part 2Xof the substrate 2 within the front surface of the substrate 2 and is not connected to other conductors at least within the same plane; external electrodes 26a, 26b arranged in parallel with the front surface of the substrate 2; and a bump electrode 25b formed on the front surface of the lead-out conductor 11a by electrolytic plating, and connecting the lead-out conductor 11a to the external electrode 26b. The areas of the external electrodes 26a, 26b are larger than those of the bump electrodes 25a, 25b to thereby secure bonding strength in surface mounting.
Abstract:
PROBLEM TO BE SOLVED: To provide a planar coil element achieving intensity and magnetic permeability at the same time.SOLUTION: In a planar coil element 10, a coil part 19 has a magnetic core part 21 in which metal magnetic powder containing resin 20 includes a first metal magnetic powder 30. Proportion of tilting metal magnetic powder in the first metal magnetic powder 30 is greater in the core part 21 than outside of the core part 21, and in most of the first metal magnetic powder 30 in the core part 21, major axes thereof tilt against a thickness direction and a surface direction of a board 16. Therefore, intensity in the planar coil element 10 is increased comparing to one in a planar coil element 110 in Fig. 9 (a), and magnetic permeability in the planar coil element 10 is also increased comparing to one in a planar coil element 210 in Fig. 9 (b). Thus, the planar coil element is provided with achieving intensity and magnetic permeability on a high level at the same time.
Abstract:
PROBLEM TO BE SOLVED: To provide a planar coil element manufacture of which is facilitated by an easy-to-handle resin, and to provide a manufacturing method therefor.SOLUTION: In a planar coil element 10 and a manufacturing method therefor, a metal magnetic powder-containing resin 20 containing a flat or acicular first metal magnetic powder 30 further contains a second metal magnetic powder 32 having an average particle diameter (1 μm) smaller than that (32 μm) of the first metal magnetic powder 30, and thereby the viscosity of the metal magnetic powder-containing resin 20 decreases significantly. Consequently, the metal magnetic powder-containing resin 20 can be handled easily when it is applied and shaped to surround a coil 19, thus facilitating manufacture of the planar coil element 10.
Abstract:
PROBLEM TO BE SOLVED: To provide a coil component which allows for enhancement of inductance while suppressing increase in core loss.SOLUTION: A coil component 1 comprises: a substrate 2; planar spiral conductors 10a, 10b formed, respectively, on the front surface 2t and the back surface 2b of the substrate 2 by electrolytic plating; and a metal magnetic powder-containing resin 22 covering the planar spiral conductors 10a, 10b, respectively. The metal magnetic powder-containing resin 22 contains first metal powder having a first average grain size, second metal powder having a second average grain size smaller than the first average grain size, and third metal powder having a third average grain size smaller than the second average grain size. The first average grain size is 15-100 μm, and the third average grain size is 2 μm or less. The first metal powder is a Permalloy-based material, and the second third metal powders are carbonyl iron.