COMMON MODE NOISE FILTER

• US 20130229252A1
• Filed: 09/09/2011
• Published: 09/05/2013
• Est. Priority Date: 09/22/2010
• Status: Active Grant

• Current Assignee: Taiyo Yuden Company Limited (Taiyo Yuden Co)
• Original Assignee: Taiyo Yuden Company Limited (Taiyo Yuden Co)
• Inventors: Nogi, Kenichiro, Taketomi, Koji, Motomiya, Yoshiyuki, Takahashi, Takumi, Iwao, Hidemi, Shimizu, Masayuki
• Granted Patent: US 8,653,928 B2
• Time in Patent Office: Days
• US Class Current: 336/192
• CPC Class Codes: H01F 17/0013 with stacked layers
• CPC Class Codes: H01F 17/04 with magnetic core
• CPC Class Codes: H01F 27/2804 Printed windings
• CPC Class Codes: H01F 27/292 Surface mounted devices

Abstract

A common mode noise filter includes: a first magnetic body and a second magnetic body; a non-magnetic body sandwiched between the first magnetic body and second magnetic body; and a first coil conductor and a second coil conductor of planar shape which are embedded in the non-magnetic body and positioned on the first magnetic body side and second magnetic body side in the non-magnetic body in a manner facing each other in a non-contact state; wherein a first lead conductor that connects one end of the first coil conductor to a first external terminal is embedded in the non-magnetic body 13, while a second lead conductor that connects one end of the second coil conductor to a third external terminal is embedded in the non-magnetic body.

Claims

1. A common mode noise filter comprising:

a first magnetic body and a second magnetic body;

a non-magnetic body sandwiched between the first magnetic body and second magnetic body;

a first coil conductor and a second coil conductor of planar shape which are embedded in the non-magnetic body and positioned on the first magnetic body side and second magnetic body side in the non-magnetic body in a manner facing each other in a non-contact state;

a first external terminal connected to one end of the first coil conductor via a first lead conductor;

a second external terminal connected to other end of the first coil conductor;

a third external terminal connected to one end of the second coil conductor via a second lead conductor; and

a fourth external terminal connected to other end of the second coil conductor;

wherein the first lead conductor is embedded in the non-magnetic body except where connected to the first external terminal, and

the second lead conductor is embedded in the non-magnetic body except where connected to the third external terminal.

2. A common mode noise filter according to claim 1, wherein

with the first lead conductor embedded in the non-magnetic body, a part of the non-magnetic body covering the first lead conductor present at a position closer to the first magnetic body than the first coil conductor protrudes toward the first magnetic body and bites into the first magnetic body;

and

with the second lead conductor embedded in the non-magnetic body, a part of the non-magnetic body covering the second lead conductor present at a position closer to the second magnetic body than the second coil conductor protrudes toward the second magnetic body and bites into the second magnetic body.

3. A common mode noise filter according to claim 1, wherein

one end of the first coil conductor is connected to the first lead conductor through a first via conductor provided in the non-magnetic body;

and

one end of the second coil conductor is connected to the second lead conductor through a second via conductor provided in the non-magnetic body.

4. A common mode noise filter according to claim 2, wherein

one end of the first coil conductor is connected to the first lead conductor through a first via conductor provided in the non-magnetic body;

and

one end of the second coil conductor is connected to the second lead conductor through a second via conductor provided in the non-magnetic body.

5. A common mode noise filter according to claim 1, wherein the non-magnetic body, the first magnetic body, and the second magnetic body are constituted by layers, respectively, which layers are sintered simultaneously.