US 2004/0201134 A1 · Forming method of magnetic body, magnetic body, and printed circuit board

Abstract

A method of forming a magnetic body, alternative to a ferrite core, on a printed circuit board is provided. A printed circuit board is set in a mold and injection molding is conducted. The mold comprises a fixed plate, an intermediate plate and a movable plate. A cavity in the intermediate plate is filled with a melted material (i.e., mixture of resin and magnetic filler) supplied via a sprue and a runner. A cavity in the movable plate is also filled with the material supplied to the cavity in the intermediate plate through a hole in the printed circuit board. When a magnetic body for noise control is directly injection molded onto the printed circuit board in such a way, no gap appears between the magnetic body and the printed circuit board. As a result, the magnetic body functions well as desired.

Claims19

Dependent claims

1-8. (CANCELED).

Dependencies are inferred from the claim text.

Facts

Application

10/831,428Filed 23 Apr 2004

Priority

JP 2001-2335591 Aug 2001

Published

14 Oct 2004

Term ends

Not estimatedThe source records don’t support an estimate.

Classification13 codes

H05K 1/165
Incorporating printed electric components, e.g. printed resistors, capacitors or inductors: incorporating printed inductors
H01F 17/06
With magnetic core: with core substantially closed in itself, e.g. toroid
H01F 41/0246
Manufacturing of magnetic cores by mechanical means: manufacturing of magnetic circuits by moulding or by pressing powder
H01F 17/0006
Fixed inductances of the signal type: printed inductances

Forming method of magnetic body, magnetic body, and printed circuit board

Life of this patent

Forming method of magnetic body, magnetic body, and printed circuit board

Life of this patent

Abstract

Claims19