COMMON MODE NOISE FILTER

• US 20130249661A1
• Filed: 09/09/2011
• Published: 09/26/2013
• Est. Priority Date: 09/24/2010
• Status: Active Grant

• Current Assignee: Taiyo Yuden Company Limited (Taiyo Yuden Co)
• Original Assignee: Taiyo Yuden Company Limited (Taiyo Yuden Co)
• Inventors: Motomiya, Yoshiyuki, Taketomi, Koji, Nogi, Kenichiro, Takahashi, Takumi, Kayahara, Katsuyuki
• Granted Patent: US 9,030,287 B2
• Time in Patent Office: Days
• US Class Current: 336/200
• CPC Class Codes: H01F 17/0013 with stacked layers
• CPC Class Codes: H01F 2017/0066 with a magnetic layer
• CPC Class Codes: H01F 2017/0093 Common mode choke coil
• CPC Class Codes: H01F 27/2804 Printed windings

Abstract

A filter body of a common mode noise filter includes: a non-magnetic body; a first magnetic body and a second magnetic body sandwiching the non-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; and also has a non-magnetic first protective part and second protective part which are made of a non-magnetic material whose strength is higher than the first magnetic body and second magnetic body and which are positioned on the outermost side of the filter body in a manner sandwiching the first magnetic body and second magnetic body.

Claims

1. A common mode noise filter having a filter body that comprises:

a non-magnetic body;

a first magnetic body and a second magnetic body sandwiching the non-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 the common mode noise filter has a non-magnetic first protective part and second protective part positioned on an outermost side of the filter body in a manner sandwiching the first magnetic body and second magnetic body, where the first protective part and second protective part are made of a non-magnetic material whose strength is higher than the first magnetic body and second magnetic body.

2. A common mode noise filter according to claim 1, wherein the non-magnetic body is made of a dielectric material and the first protective part and second protective part are made of the same dielectric material as the non-magnetic body.

3. A common mode noise filter according to claim 2, wherein the dielectric material is borosilicate glass or glass ceramics.

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