Coil component and method for manufacturing the same
US6710692B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 19, 2002 |
| Grant date | Mar 23, 2004 |
| Priority date | — |
| Expiry date | Feb 19, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F27/022
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
After an air-core coil has been set inside a molding die, the molding die is filled with a magnetic powder which is coated with at least two types of resin layers. A pure iron powder having an average particle size of about 20 &mgr;m or less is desirable for the magnetic powder. A thermosetting resin is used for the inner resin layer and a thermoplastic resin is used for the outer resin layer of the resin layers of two kinds with which the surface of the magnetic powder is coated. Then, a substantially rectangular molded body in which the air-core coil is embedded is formed by molding the magnetic powder under a molding pressure of about 1 to about 10 tons/cm2. Next, a magnetic body is formed by heat-treatment of the molded body.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.