Forming method of magnetic body and printed circuit board
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United States of America Patent
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Jul 6, 2004
Grant Date -
Feb 6, 2003
app pub date -
Jul 30, 2002
filing date -
Aug 1, 2001
priority date (Note) -
Expired
status (Latency Note)
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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.
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