US 12,249,449 B2
Soft magnetic powder, dust core, magnetic element, electronic device, and vehicle
Toshiki Sano, Hachinohe (JP)
Assigned to SEIKO EPSON CORPORATION, (JP)
Filed by Seiko Epson Corporation, Tokyo (JP)
Filed on May 12, 2022, as Appl. No. 17/742,430.
Claims priority of application No. 2021-081453 (JP), filed on May 13, 2021.
Prior Publication US 2022/0367091 A1, Nov. 17, 2022
Int. Cl. H01F 1/06 (2006.01); H01F 1/01 (2006.01); H01F 1/20 (2006.01)
CPC H01F 1/01 (2013.01) 4 Claims
OG exemplary drawing
 
1. A soft magnetic powder comprising:
two or more types of particles having different crystal structures, at least one type of the particles having an amorphous crystal structure and at least one of the type of particles having a microcrystalline crystal structure,
wherein when a volume-based particle size distribution is measured by a laser diffraction scattering type particle size distribution measuring device, and the particle size distribution is plotted in an orthogonal coordinate system in which a horizontal axis represents a particle diameter and a vertical axis represents a relative particle amount to draw a particle size distribution curve,
the particle size distribution curve has a first peak having a local maximum at a particle diameter D1 [μm] and a second peak having a local maximum at a particle diameter D2 [μm] that is larger than the particle diameter D1,
the particle diameter D1 is in a range of 1.0 μm or more and 16.0 μm or less,
the particle diameter D2 is in a range of 15 μm or more and 50.0 μm or less,
an amount of particles having the particle diameter D1 is greater than an amount of particles having the particle diameter D2, and
a difference D2−D1 between the particle diameter D1 and the particle diameter D2 satisfies following formulas (A-1) and (A-2),
D2−D1=k1×D1  (A-1)
1.0≤k1≤15.0  (A-2).