Inductor

摘要

An inductor includes soft magnetic alloy powder-containing resin that contains amorphous soft magnetic alloy powder, which resin is used as a sealing material that seals a coil wound around a winding core of the core. This soft magnetic alloy powder-containing resin contains two groups of large and small particles having a first peak and second peak in their particle size distribution, where the particle size corresponding to the second peak is equal to or smaller than one-half the particle size corresponding to the first peak, and the magnitude ratio (abundance ratio) of the second peak and first peak is 0.2 or more but 0.6 or less. The inductor demonstrates improved DC superimposition characteristics and does not cause sealing irregularities.

主权项

1. An inductor that uses soft magnetic alloy powder-containing resin that contains amorphous soft magnetic alloy powder, which resin is used as a sealing material that seals a coil wound around a winding core of a core, wherein:
the soft magnetic alloy powder-containing resin contains two groups of large and small particles separately dispersed in a cured resin, and seals the coil without compression, said two groups of large and small particles having a first peak and a second peak in their particle size distribution, respectively; a particle size corresponding to the second peak is equal to or smaller than one-half a particle size corresponding to the first peak, and an magnitude ratio (abundance ratio) of the second peak and first peak is 0.2 or more but 0.6 or less; and a top flange is formed integrally on a top end of the winding core, and a bottom flange is formed integrally on a bottom end of the winding core, wherein the bottom flange is larger than the top flange to inhibit dripping of the sealing material when the material is applied.