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US 5,978,231 AGranted
Printed wiring board with integrated coil inductor
AssigneeNEC Corporation
InventorsHirokazu Tohya, Shiro Yoshida, Yuzo Shimada
Life of this patent
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Abstract
An insulative magnetic layer is disposed between a power source conductor layer and a ground conductor layer of a printed-wiring board. Two pieces of conductors are formed by cutting out a part of the power source conductor layer. Another two pieces of conductors are formed by cutting out a part of the ground conductor layer. The former conductors and the latter conductors are connected by five viaholes. A spiral coil inductor of a spiral form is formed in this way. This inductor has the strengthened inductance owing to the insulative magnetic layer provided therein.
Claims20
A printed-wiring board comprising:
- at least one electronic circuit;
- and
- a substrate for mounting said electronic circuit, wherein said substrate comprises:
- two or more conductor layers;
- a coil inductor composed of a plurality of conductor strips formed by cutting a part of a pair of conductor layers disposed opposite to each other from among said conductor layers, and viaholes connecting said plurality of conductor strips;
- an insulative magnetic material being disposed between said pair of conductor layers facing each other used for composing said coil inductor;
- and
- wherein a first end of said coil inductor is connected to a power source terminal of said electronic circuit and a second end of said coil inductor is connected to a first power source conductor layer.
5 more elements
Dependencies are inferred from the claim text.