Title:
POWDER COMPRESSION-MOLDED CORE, METHOD FOR PRODUCING POWDER COMPRESSION-MOLDED CORE, INDUCTOR HAVING POWDER COMPRESSION-MOLDED CORE, AND ELECTRONIC/ELECTRICAL DEVICE HAVING SAID INDUCTOR
Document Type and Number:
WIPO Patent Application WO/2020/090405
Kind Code:
A1
Abstract:
Provided is a powder compression-molded core which is suitable as a constituent member of a small inductor and contains a plurality of types of powders composed of soft magnetic materials, wherein a first powder and a second powder, which are two types of the plurality of types of powders, satisfy the following expressions. (1-1): D1>D2, (1-2): 0.23≤(D1-D2)/D1<0.3, (1-3): D1≤5.9 μm, and (1-4): 3 μm≤DT≤5.7 μm. Among the plurality of types of powders contained in the powder compression-molded core, the first powder has the largest particle diameter (median diameter) and the second powder has the smallest median diameter at a cumulative particle size distribution of 50% from the small particle size side in a volume-based particle size distribution measured by a laser diffraction/scattering method. D1 is the median diameter of the first powder, and D2 is the median diameter of the second powder. DT can be obtained by R1×D1+R2×D2 using the weight ratio R1 of the first powder and the weight ratio R2 of the second powder.
Inventors:
KOJIMA AKINORI (JP)
NAKABAYASHI RYO (JP)
SATO KEIICHIRO (JP)
NAKABAYASHI RYO (JP)
SATO KEIICHIRO (JP)
Application Number:
PCT/JP2019/040011
Publication Date:
May 07, 2020
Filing Date:
October 10, 2019
Export Citation:
Assignee:
ALPS ALPINE CO LTD (JP)
International Classes:
H01F27/255; H01F17/04
Domestic Patent References:
| WO2009139368A1 | 2009-11-19 | |||
| WO2018142666A1 | 2018-08-09 |
Foreign References:
| JP2010118486A | 2010-05-27 | |||
| JP2018182203A | 2018-11-15 |
Attorney, Agent or Firm:
OKUBO, Katsuyuki (JP)
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